1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * NET3 Protocol independent device support routines.
5 * Derived from the non IP parts of dev.c 1.0.19
7 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
8 * Mark Evans, <evansmp@uhura.aston.ac.uk>
11 * Florian la Roche <rzsfl@rz.uni-sb.de>
12 * Alan Cox <gw4pts@gw4pts.ampr.org>
13 * David Hinds <dahinds@users.sourceforge.net>
14 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
15 * Adam Sulmicki <adam@cfar.umd.edu>
16 * Pekka Riikonen <priikone@poesidon.pspt.fi>
19 * D.J. Barrow : Fixed bug where dev->refcnt gets set
20 * to 2 if register_netdev gets called
21 * before net_dev_init & also removed a
22 * few lines of code in the process.
23 * Alan Cox : device private ioctl copies fields back.
24 * Alan Cox : Transmit queue code does relevant
25 * stunts to keep the queue safe.
26 * Alan Cox : Fixed double lock.
27 * Alan Cox : Fixed promisc NULL pointer trap
28 * ???????? : Support the full private ioctl range
29 * Alan Cox : Moved ioctl permission check into
31 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
32 * Alan Cox : 100 backlog just doesn't cut it when
33 * you start doing multicast video 8)
34 * Alan Cox : Rewrote net_bh and list manager.
35 * Alan Cox : Fix ETH_P_ALL echoback lengths.
36 * Alan Cox : Took out transmit every packet pass
37 * Saved a few bytes in the ioctl handler
38 * Alan Cox : Network driver sets packet type before
39 * calling netif_rx. Saves a function
41 * Alan Cox : Hashed net_bh()
42 * Richard Kooijman: Timestamp fixes.
43 * Alan Cox : Wrong field in SIOCGIFDSTADDR
44 * Alan Cox : Device lock protection.
45 * Alan Cox : Fixed nasty side effect of device close
47 * Rudi Cilibrasi : Pass the right thing to
49 * Dave Miller : 32bit quantity for the device lock to
50 * make it work out on a Sparc.
51 * Bjorn Ekwall : Added KERNELD hack.
52 * Alan Cox : Cleaned up the backlog initialise.
53 * Craig Metz : SIOCGIFCONF fix if space for under
55 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
56 * is no device open function.
57 * Andi Kleen : Fix error reporting for SIOCGIFCONF
58 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
59 * Cyrus Durgin : Cleaned for KMOD
60 * Adam Sulmicki : Bug Fix : Network Device Unload
61 * A network device unload needs to purge
63 * Paul Rusty Russell : SIOCSIFNAME
64 * Pekka Riikonen : Netdev boot-time settings code
65 * Andrew Morton : Make unregister_netdevice wait
66 * indefinitely on dev->refcnt
67 * J Hadi Salim : - Backlog queue sampling
68 * - netif_rx() feedback
71 #include <linux/uaccess.h>
72 #include <linux/bitops.h>
73 #include <linux/capability.h>
74 #include <linux/cpu.h>
75 #include <linux/types.h>
76 #include <linux/kernel.h>
77 #include <linux/hash.h>
78 #include <linux/slab.h>
79 #include <linux/sched.h>
80 #include <linux/sched/mm.h>
81 #include <linux/mutex.h>
82 #include <linux/rwsem.h>
83 #include <linux/string.h>
85 #include <linux/socket.h>
86 #include <linux/sockios.h>
87 #include <linux/errno.h>
88 #include <linux/interrupt.h>
89 #include <linux/if_ether.h>
90 #include <linux/netdevice.h>
91 #include <linux/etherdevice.h>
92 #include <linux/ethtool.h>
93 #include <linux/skbuff.h>
94 #include <linux/bpf.h>
95 #include <linux/bpf_trace.h>
96 #include <net/net_namespace.h>
98 #include <net/busy_poll.h>
99 #include <linux/rtnetlink.h>
100 #include <linux/stat.h>
103 #include <net/dst_metadata.h>
104 #include <net/pkt_sched.h>
105 #include <net/pkt_cls.h>
106 #include <net/checksum.h>
107 #include <net/xfrm.h>
108 #include <linux/highmem.h>
109 #include <linux/init.h>
110 #include <linux/module.h>
111 #include <linux/netpoll.h>
112 #include <linux/rcupdate.h>
113 #include <linux/delay.h>
114 #include <net/iw_handler.h>
115 #include <asm/current.h>
116 #include <linux/audit.h>
117 #include <linux/dmaengine.h>
118 #include <linux/err.h>
119 #include <linux/ctype.h>
120 #include <linux/if_arp.h>
121 #include <linux/if_vlan.h>
122 #include <linux/ip.h>
124 #include <net/mpls.h>
125 #include <linux/ipv6.h>
126 #include <linux/in.h>
127 #include <linux/jhash.h>
128 #include <linux/random.h>
129 #include <trace/events/napi.h>
130 #include <trace/events/net.h>
131 #include <trace/events/skb.h>
132 #include <linux/inetdevice.h>
133 #include <linux/cpu_rmap.h>
134 #include <linux/static_key.h>
135 #include <linux/hashtable.h>
136 #include <linux/vmalloc.h>
137 #include <linux/if_macvlan.h>
138 #include <linux/errqueue.h>
139 #include <linux/hrtimer.h>
140 #include <linux/netfilter_ingress.h>
141 #include <linux/crash_dump.h>
142 #include <linux/sctp.h>
143 #include <net/udp_tunnel.h>
144 #include <linux/net_namespace.h>
145 #include <linux/indirect_call_wrapper.h>
146 #include <net/devlink.h>
147 #include <linux/pm_runtime.h>
148 #include <linux/prandom.h>
150 #include "net-sysfs.h"
152 #define MAX_GRO_SKBS 8
154 /* This should be increased if a protocol with a bigger head is added. */
155 #define GRO_MAX_HEAD (MAX_HEADER + 128)
157 static DEFINE_SPINLOCK(ptype_lock);
158 static DEFINE_SPINLOCK(offload_lock);
159 struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
160 struct list_head ptype_all __read_mostly; /* Taps */
161 static struct list_head offload_base __read_mostly;
163 static int netif_rx_internal(struct sk_buff *skb);
164 static int call_netdevice_notifiers_info(unsigned long val,
165 struct netdev_notifier_info *info);
166 static int call_netdevice_notifiers_extack(unsigned long val,
167 struct net_device *dev,
168 struct netlink_ext_ack *extack);
169 static struct napi_struct *napi_by_id(unsigned int napi_id);
172 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
175 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
177 * Writers must hold the rtnl semaphore while they loop through the
178 * dev_base_head list, and hold dev_base_lock for writing when they do the
179 * actual updates. This allows pure readers to access the list even
180 * while a writer is preparing to update it.
182 * To put it another way, dev_base_lock is held for writing only to
183 * protect against pure readers; the rtnl semaphore provides the
184 * protection against other writers.
186 * See, for example usages, register_netdevice() and
187 * unregister_netdevice(), which must be called with the rtnl
190 DEFINE_RWLOCK(dev_base_lock);
191 EXPORT_SYMBOL(dev_base_lock);
193 static DEFINE_MUTEX(ifalias_mutex);
195 /* protects napi_hash addition/deletion and napi_gen_id */
196 static DEFINE_SPINLOCK(napi_hash_lock);
198 static unsigned int napi_gen_id = NR_CPUS;
199 static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8);
201 static DECLARE_RWSEM(devnet_rename_sem);
203 static inline void dev_base_seq_inc(struct net *net)
205 while (++net->dev_base_seq == 0)
209 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
211 unsigned int hash = full_name_hash(net, name, strnlen(name, IFNAMSIZ));
213 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
216 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
218 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
221 static inline void rps_lock(struct softnet_data *sd)
224 spin_lock(&sd->input_pkt_queue.lock);
228 static inline void rps_unlock(struct softnet_data *sd)
231 spin_unlock(&sd->input_pkt_queue.lock);
235 static struct netdev_name_node *netdev_name_node_alloc(struct net_device *dev,
238 struct netdev_name_node *name_node;
240 name_node = kmalloc(sizeof(*name_node), GFP_KERNEL);
243 INIT_HLIST_NODE(&name_node->hlist);
244 name_node->dev = dev;
245 name_node->name = name;
249 static struct netdev_name_node *
250 netdev_name_node_head_alloc(struct net_device *dev)
252 struct netdev_name_node *name_node;
254 name_node = netdev_name_node_alloc(dev, dev->name);
257 INIT_LIST_HEAD(&name_node->list);
261 static void netdev_name_node_free(struct netdev_name_node *name_node)
266 static void netdev_name_node_add(struct net *net,
267 struct netdev_name_node *name_node)
269 hlist_add_head_rcu(&name_node->hlist,
270 dev_name_hash(net, name_node->name));
273 static void netdev_name_node_del(struct netdev_name_node *name_node)
275 hlist_del_rcu(&name_node->hlist);
278 static struct netdev_name_node *netdev_name_node_lookup(struct net *net,
281 struct hlist_head *head = dev_name_hash(net, name);
282 struct netdev_name_node *name_node;
284 hlist_for_each_entry(name_node, head, hlist)
285 if (!strcmp(name_node->name, name))
290 static struct netdev_name_node *netdev_name_node_lookup_rcu(struct net *net,
293 struct hlist_head *head = dev_name_hash(net, name);
294 struct netdev_name_node *name_node;
296 hlist_for_each_entry_rcu(name_node, head, hlist)
297 if (!strcmp(name_node->name, name))
302 int netdev_name_node_alt_create(struct net_device *dev, const char *name)
304 struct netdev_name_node *name_node;
305 struct net *net = dev_net(dev);
307 name_node = netdev_name_node_lookup(net, name);
310 name_node = netdev_name_node_alloc(dev, name);
313 netdev_name_node_add(net, name_node);
314 /* The node that holds dev->name acts as a head of per-device list. */
315 list_add_tail(&name_node->list, &dev->name_node->list);
319 EXPORT_SYMBOL(netdev_name_node_alt_create);
321 static void __netdev_name_node_alt_destroy(struct netdev_name_node *name_node)
323 list_del(&name_node->list);
324 netdev_name_node_del(name_node);
325 kfree(name_node->name);
326 netdev_name_node_free(name_node);
329 int netdev_name_node_alt_destroy(struct net_device *dev, const char *name)
331 struct netdev_name_node *name_node;
332 struct net *net = dev_net(dev);
334 name_node = netdev_name_node_lookup(net, name);
337 /* lookup might have found our primary name or a name belonging
340 if (name_node == dev->name_node || name_node->dev != dev)
343 __netdev_name_node_alt_destroy(name_node);
347 EXPORT_SYMBOL(netdev_name_node_alt_destroy);
349 static void netdev_name_node_alt_flush(struct net_device *dev)
351 struct netdev_name_node *name_node, *tmp;
353 list_for_each_entry_safe(name_node, tmp, &dev->name_node->list, list)
354 __netdev_name_node_alt_destroy(name_node);
357 /* Device list insertion */
358 static void list_netdevice(struct net_device *dev)
360 struct net *net = dev_net(dev);
364 write_lock_bh(&dev_base_lock);
365 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
366 netdev_name_node_add(net, dev->name_node);
367 hlist_add_head_rcu(&dev->index_hlist,
368 dev_index_hash(net, dev->ifindex));
369 write_unlock_bh(&dev_base_lock);
371 dev_base_seq_inc(net);
374 /* Device list removal
375 * caller must respect a RCU grace period before freeing/reusing dev
377 static void unlist_netdevice(struct net_device *dev)
381 /* Unlink dev from the device chain */
382 write_lock_bh(&dev_base_lock);
383 list_del_rcu(&dev->dev_list);
384 netdev_name_node_del(dev->name_node);
385 hlist_del_rcu(&dev->index_hlist);
386 write_unlock_bh(&dev_base_lock);
388 dev_base_seq_inc(dev_net(dev));
395 static RAW_NOTIFIER_HEAD(netdev_chain);
398 * Device drivers call our routines to queue packets here. We empty the
399 * queue in the local softnet handler.
402 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
403 EXPORT_PER_CPU_SYMBOL(softnet_data);
405 #ifdef CONFIG_LOCKDEP
407 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
408 * according to dev->type
410 static const unsigned short netdev_lock_type[] = {
411 ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
412 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
413 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
414 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
415 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
416 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
417 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
418 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
419 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
420 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
421 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
422 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
423 ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
424 ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
425 ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};
427 static const char *const netdev_lock_name[] = {
428 "_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
429 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
430 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
431 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
432 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
433 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
434 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
435 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
436 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
437 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
438 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
439 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
440 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
441 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
442 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
444 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
445 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
447 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
451 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
452 if (netdev_lock_type[i] == dev_type)
454 /* the last key is used by default */
455 return ARRAY_SIZE(netdev_lock_type) - 1;
458 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
459 unsigned short dev_type)
463 i = netdev_lock_pos(dev_type);
464 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
465 netdev_lock_name[i]);
468 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
472 i = netdev_lock_pos(dev->type);
473 lockdep_set_class_and_name(&dev->addr_list_lock,
474 &netdev_addr_lock_key[i],
475 netdev_lock_name[i]);
478 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
479 unsigned short dev_type)
483 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
488 /*******************************************************************************
490 * Protocol management and registration routines
492 *******************************************************************************/
496 * Add a protocol ID to the list. Now that the input handler is
497 * smarter we can dispense with all the messy stuff that used to be
500 * BEWARE!!! Protocol handlers, mangling input packets,
501 * MUST BE last in hash buckets and checking protocol handlers
502 * MUST start from promiscuous ptype_all chain in net_bh.
503 * It is true now, do not change it.
504 * Explanation follows: if protocol handler, mangling packet, will
505 * be the first on list, it is not able to sense, that packet
506 * is cloned and should be copied-on-write, so that it will
507 * change it and subsequent readers will get broken packet.
511 static inline struct list_head *ptype_head(const struct packet_type *pt)
513 if (pt->type == htons(ETH_P_ALL))
514 return pt->dev ? &pt->dev->ptype_all : &ptype_all;
516 return pt->dev ? &pt->dev->ptype_specific :
517 &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
521 * dev_add_pack - add packet handler
522 * @pt: packet type declaration
524 * Add a protocol handler to the networking stack. The passed &packet_type
525 * is linked into kernel lists and may not be freed until it has been
526 * removed from the kernel lists.
528 * This call does not sleep therefore it can not
529 * guarantee all CPU's that are in middle of receiving packets
530 * will see the new packet type (until the next received packet).
533 void dev_add_pack(struct packet_type *pt)
535 struct list_head *head = ptype_head(pt);
537 spin_lock(&ptype_lock);
538 list_add_rcu(&pt->list, head);
539 spin_unlock(&ptype_lock);
541 EXPORT_SYMBOL(dev_add_pack);
544 * __dev_remove_pack - remove packet handler
545 * @pt: packet type declaration
547 * Remove a protocol handler that was previously added to the kernel
548 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
549 * from the kernel lists and can be freed or reused once this function
552 * The packet type might still be in use by receivers
553 * and must not be freed until after all the CPU's have gone
554 * through a quiescent state.
556 void __dev_remove_pack(struct packet_type *pt)
558 struct list_head *head = ptype_head(pt);
559 struct packet_type *pt1;
561 spin_lock(&ptype_lock);
563 list_for_each_entry(pt1, head, list) {
565 list_del_rcu(&pt->list);
570 pr_warn("dev_remove_pack: %p not found\n", pt);
572 spin_unlock(&ptype_lock);
574 EXPORT_SYMBOL(__dev_remove_pack);
577 * dev_remove_pack - remove packet handler
578 * @pt: packet type declaration
580 * Remove a protocol handler that was previously added to the kernel
581 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
582 * from the kernel lists and can be freed or reused once this function
585 * This call sleeps to guarantee that no CPU is looking at the packet
588 void dev_remove_pack(struct packet_type *pt)
590 __dev_remove_pack(pt);
594 EXPORT_SYMBOL(dev_remove_pack);
598 * dev_add_offload - register offload handlers
599 * @po: protocol offload declaration
601 * Add protocol offload handlers to the networking stack. The passed
602 * &proto_offload is linked into kernel lists and may not be freed until
603 * it has been removed from the kernel lists.
605 * This call does not sleep therefore it can not
606 * guarantee all CPU's that are in middle of receiving packets
607 * will see the new offload handlers (until the next received packet).
609 void dev_add_offload(struct packet_offload *po)
611 struct packet_offload *elem;
613 spin_lock(&offload_lock);
614 list_for_each_entry(elem, &offload_base, list) {
615 if (po->priority < elem->priority)
618 list_add_rcu(&po->list, elem->list.prev);
619 spin_unlock(&offload_lock);
621 EXPORT_SYMBOL(dev_add_offload);
624 * __dev_remove_offload - remove offload handler
625 * @po: packet offload declaration
627 * Remove a protocol offload handler that was previously added to the
628 * kernel offload handlers by dev_add_offload(). The passed &offload_type
629 * is removed from the kernel lists and can be freed or reused once this
632 * The packet type might still be in use by receivers
633 * and must not be freed until after all the CPU's have gone
634 * through a quiescent state.
636 static void __dev_remove_offload(struct packet_offload *po)
638 struct list_head *head = &offload_base;
639 struct packet_offload *po1;
641 spin_lock(&offload_lock);
643 list_for_each_entry(po1, head, list) {
645 list_del_rcu(&po->list);
650 pr_warn("dev_remove_offload: %p not found\n", po);
652 spin_unlock(&offload_lock);
656 * dev_remove_offload - remove packet offload handler
657 * @po: packet offload declaration
659 * Remove a packet offload handler that was previously added to the kernel
660 * offload handlers by dev_add_offload(). The passed &offload_type is
661 * removed from the kernel lists and can be freed or reused once this
664 * This call sleeps to guarantee that no CPU is looking at the packet
667 void dev_remove_offload(struct packet_offload *po)
669 __dev_remove_offload(po);
673 EXPORT_SYMBOL(dev_remove_offload);
675 /******************************************************************************
677 * Device Boot-time Settings Routines
679 ******************************************************************************/
681 /* Boot time configuration table */
682 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
685 * netdev_boot_setup_add - add new setup entry
686 * @name: name of the device
687 * @map: configured settings for the device
689 * Adds new setup entry to the dev_boot_setup list. The function
690 * returns 0 on error and 1 on success. This is a generic routine to
693 static int netdev_boot_setup_add(char *name, struct ifmap *map)
695 struct netdev_boot_setup *s;
699 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
700 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
701 memset(s[i].name, 0, sizeof(s[i].name));
702 strlcpy(s[i].name, name, IFNAMSIZ);
703 memcpy(&s[i].map, map, sizeof(s[i].map));
708 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
712 * netdev_boot_setup_check - check boot time settings
713 * @dev: the netdevice
715 * Check boot time settings for the device.
716 * The found settings are set for the device to be used
717 * later in the device probing.
718 * Returns 0 if no settings found, 1 if they are.
720 int netdev_boot_setup_check(struct net_device *dev)
722 struct netdev_boot_setup *s = dev_boot_setup;
725 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
726 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
727 !strcmp(dev->name, s[i].name)) {
728 dev->irq = s[i].map.irq;
729 dev->base_addr = s[i].map.base_addr;
730 dev->mem_start = s[i].map.mem_start;
731 dev->mem_end = s[i].map.mem_end;
737 EXPORT_SYMBOL(netdev_boot_setup_check);
741 * netdev_boot_base - get address from boot time settings
742 * @prefix: prefix for network device
743 * @unit: id for network device
745 * Check boot time settings for the base address of device.
746 * The found settings are set for the device to be used
747 * later in the device probing.
748 * Returns 0 if no settings found.
750 unsigned long netdev_boot_base(const char *prefix, int unit)
752 const struct netdev_boot_setup *s = dev_boot_setup;
756 sprintf(name, "%s%d", prefix, unit);
759 * If device already registered then return base of 1
760 * to indicate not to probe for this interface
762 if (__dev_get_by_name(&init_net, name))
765 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
766 if (!strcmp(name, s[i].name))
767 return s[i].map.base_addr;
772 * Saves at boot time configured settings for any netdevice.
774 int __init netdev_boot_setup(char *str)
779 str = get_options(str, ARRAY_SIZE(ints), ints);
784 memset(&map, 0, sizeof(map));
788 map.base_addr = ints[2];
790 map.mem_start = ints[3];
792 map.mem_end = ints[4];
794 /* Add new entry to the list */
795 return netdev_boot_setup_add(str, &map);
798 __setup("netdev=", netdev_boot_setup);
800 /*******************************************************************************
802 * Device Interface Subroutines
804 *******************************************************************************/
807 * dev_get_iflink - get 'iflink' value of a interface
808 * @dev: targeted interface
810 * Indicates the ifindex the interface is linked to.
811 * Physical interfaces have the same 'ifindex' and 'iflink' values.
814 int dev_get_iflink(const struct net_device *dev)
816 if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink)
817 return dev->netdev_ops->ndo_get_iflink(dev);
821 EXPORT_SYMBOL(dev_get_iflink);
824 * dev_fill_metadata_dst - Retrieve tunnel egress information.
825 * @dev: targeted interface
828 * For better visibility of tunnel traffic OVS needs to retrieve
829 * egress tunnel information for a packet. Following API allows
830 * user to get this info.
832 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
834 struct ip_tunnel_info *info;
836 if (!dev->netdev_ops || !dev->netdev_ops->ndo_fill_metadata_dst)
839 info = skb_tunnel_info_unclone(skb);
842 if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX)))
845 return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb);
847 EXPORT_SYMBOL_GPL(dev_fill_metadata_dst);
850 * __dev_get_by_name - find a device by its name
851 * @net: the applicable net namespace
852 * @name: name to find
854 * Find an interface by name. Must be called under RTNL semaphore
855 * or @dev_base_lock. If the name is found a pointer to the device
856 * is returned. If the name is not found then %NULL is returned. The
857 * reference counters are not incremented so the caller must be
858 * careful with locks.
861 struct net_device *__dev_get_by_name(struct net *net, const char *name)
863 struct netdev_name_node *node_name;
865 node_name = netdev_name_node_lookup(net, name);
866 return node_name ? node_name->dev : NULL;
868 EXPORT_SYMBOL(__dev_get_by_name);
871 * dev_get_by_name_rcu - find a device by its name
872 * @net: the applicable net namespace
873 * @name: name to find
875 * Find an interface by name.
876 * If the name is found a pointer to the device is returned.
877 * If the name is not found then %NULL is returned.
878 * The reference counters are not incremented so the caller must be
879 * careful with locks. The caller must hold RCU lock.
882 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
884 struct netdev_name_node *node_name;
886 node_name = netdev_name_node_lookup_rcu(net, name);
887 return node_name ? node_name->dev : NULL;
889 EXPORT_SYMBOL(dev_get_by_name_rcu);
892 * dev_get_by_name - find a device by its name
893 * @net: the applicable net namespace
894 * @name: name to find
896 * Find an interface by name. This can be called from any
897 * context and does its own locking. The returned handle has
898 * the usage count incremented and the caller must use dev_put() to
899 * release it when it is no longer needed. %NULL is returned if no
900 * matching device is found.
903 struct net_device *dev_get_by_name(struct net *net, const char *name)
905 struct net_device *dev;
908 dev = dev_get_by_name_rcu(net, name);
914 EXPORT_SYMBOL(dev_get_by_name);
917 * __dev_get_by_index - find a device by its ifindex
918 * @net: the applicable net namespace
919 * @ifindex: index of device
921 * Search for an interface by index. Returns %NULL if the device
922 * is not found or a pointer to the device. The device has not
923 * had its reference counter increased so the caller must be careful
924 * about locking. The caller must hold either the RTNL semaphore
928 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
930 struct net_device *dev;
931 struct hlist_head *head = dev_index_hash(net, ifindex);
933 hlist_for_each_entry(dev, head, index_hlist)
934 if (dev->ifindex == ifindex)
939 EXPORT_SYMBOL(__dev_get_by_index);
942 * dev_get_by_index_rcu - find a device by its ifindex
943 * @net: the applicable net namespace
944 * @ifindex: index of device
946 * Search for an interface by index. Returns %NULL if the device
947 * is not found or a pointer to the device. The device has not
948 * had its reference counter increased so the caller must be careful
949 * about locking. The caller must hold RCU lock.
952 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
954 struct net_device *dev;
955 struct hlist_head *head = dev_index_hash(net, ifindex);
957 hlist_for_each_entry_rcu(dev, head, index_hlist)
958 if (dev->ifindex == ifindex)
963 EXPORT_SYMBOL(dev_get_by_index_rcu);
967 * dev_get_by_index - find a device by its ifindex
968 * @net: the applicable net namespace
969 * @ifindex: index of device
971 * Search for an interface by index. Returns NULL if the device
972 * is not found or a pointer to the device. The device returned has
973 * had a reference added and the pointer is safe until the user calls
974 * dev_put to indicate they have finished with it.
977 struct net_device *dev_get_by_index(struct net *net, int ifindex)
979 struct net_device *dev;
982 dev = dev_get_by_index_rcu(net, ifindex);
988 EXPORT_SYMBOL(dev_get_by_index);
991 * dev_get_by_napi_id - find a device by napi_id
992 * @napi_id: ID of the NAPI struct
994 * Search for an interface by NAPI ID. Returns %NULL if the device
995 * is not found or a pointer to the device. The device has not had
996 * its reference counter increased so the caller must be careful
997 * about locking. The caller must hold RCU lock.
1000 struct net_device *dev_get_by_napi_id(unsigned int napi_id)
1002 struct napi_struct *napi;
1004 WARN_ON_ONCE(!rcu_read_lock_held());
1006 if (napi_id < MIN_NAPI_ID)
1009 napi = napi_by_id(napi_id);
1011 return napi ? napi->dev : NULL;
1013 EXPORT_SYMBOL(dev_get_by_napi_id);
1016 * netdev_get_name - get a netdevice name, knowing its ifindex.
1017 * @net: network namespace
1018 * @name: a pointer to the buffer where the name will be stored.
1019 * @ifindex: the ifindex of the interface to get the name from.
1021 int netdev_get_name(struct net *net, char *name, int ifindex)
1023 struct net_device *dev;
1026 down_read(&devnet_rename_sem);
1029 dev = dev_get_by_index_rcu(net, ifindex);
1035 strcpy(name, dev->name);
1040 up_read(&devnet_rename_sem);
1045 * dev_getbyhwaddr_rcu - find a device by its hardware address
1046 * @net: the applicable net namespace
1047 * @type: media type of device
1048 * @ha: hardware address
1050 * Search for an interface by MAC address. Returns NULL if the device
1051 * is not found or a pointer to the device.
1052 * The caller must hold RCU or RTNL.
1053 * The returned device has not had its ref count increased
1054 * and the caller must therefore be careful about locking
1058 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
1061 struct net_device *dev;
1063 for_each_netdev_rcu(net, dev)
1064 if (dev->type == type &&
1065 !memcmp(dev->dev_addr, ha, dev->addr_len))
1070 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
1072 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
1074 struct net_device *dev, *ret = NULL;
1077 for_each_netdev_rcu(net, dev)
1078 if (dev->type == type) {
1086 EXPORT_SYMBOL(dev_getfirstbyhwtype);
1089 * __dev_get_by_flags - find any device with given flags
1090 * @net: the applicable net namespace
1091 * @if_flags: IFF_* values
1092 * @mask: bitmask of bits in if_flags to check
1094 * Search for any interface with the given flags. Returns NULL if a device
1095 * is not found or a pointer to the device. Must be called inside
1096 * rtnl_lock(), and result refcount is unchanged.
1099 struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags,
1100 unsigned short mask)
1102 struct net_device *dev, *ret;
1107 for_each_netdev(net, dev) {
1108 if (((dev->flags ^ if_flags) & mask) == 0) {
1115 EXPORT_SYMBOL(__dev_get_by_flags);
1118 * dev_valid_name - check if name is okay for network device
1119 * @name: name string
1121 * Network device names need to be valid file names to
1122 * allow sysfs to work. We also disallow any kind of
1125 bool dev_valid_name(const char *name)
1129 if (strnlen(name, IFNAMSIZ) == IFNAMSIZ)
1131 if (!strcmp(name, ".") || !strcmp(name, ".."))
1135 if (*name == '/' || *name == ':' || isspace(*name))
1141 EXPORT_SYMBOL(dev_valid_name);
1144 * __dev_alloc_name - allocate a name for a device
1145 * @net: network namespace to allocate the device name in
1146 * @name: name format string
1147 * @buf: scratch buffer and result name string
1149 * Passed a format string - eg "lt%d" it will try and find a suitable
1150 * id. It scans list of devices to build up a free map, then chooses
1151 * the first empty slot. The caller must hold the dev_base or rtnl lock
1152 * while allocating the name and adding the device in order to avoid
1154 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1155 * Returns the number of the unit assigned or a negative errno code.
1158 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
1162 const int max_netdevices = 8*PAGE_SIZE;
1163 unsigned long *inuse;
1164 struct net_device *d;
1166 if (!dev_valid_name(name))
1169 p = strchr(name, '%');
1172 * Verify the string as this thing may have come from
1173 * the user. There must be either one "%d" and no other "%"
1176 if (p[1] != 'd' || strchr(p + 2, '%'))
1179 /* Use one page as a bit array of possible slots */
1180 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
1184 for_each_netdev(net, d) {
1185 if (!sscanf(d->name, name, &i))
1187 if (i < 0 || i >= max_netdevices)
1190 /* avoid cases where sscanf is not exact inverse of printf */
1191 snprintf(buf, IFNAMSIZ, name, i);
1192 if (!strncmp(buf, d->name, IFNAMSIZ))
1196 i = find_first_zero_bit(inuse, max_netdevices);
1197 free_page((unsigned long) inuse);
1200 snprintf(buf, IFNAMSIZ, name, i);
1201 if (!__dev_get_by_name(net, buf))
1204 /* It is possible to run out of possible slots
1205 * when the name is long and there isn't enough space left
1206 * for the digits, or if all bits are used.
1211 static int dev_alloc_name_ns(struct net *net,
1212 struct net_device *dev,
1219 ret = __dev_alloc_name(net, name, buf);
1221 strlcpy(dev->name, buf, IFNAMSIZ);
1226 * dev_alloc_name - allocate a name for a device
1228 * @name: name format string
1230 * Passed a format string - eg "lt%d" it will try and find a suitable
1231 * id. It scans list of devices to build up a free map, then chooses
1232 * the first empty slot. The caller must hold the dev_base or rtnl lock
1233 * while allocating the name and adding the device in order to avoid
1235 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1236 * Returns the number of the unit assigned or a negative errno code.
1239 int dev_alloc_name(struct net_device *dev, const char *name)
1241 return dev_alloc_name_ns(dev_net(dev), dev, name);
1243 EXPORT_SYMBOL(dev_alloc_name);
1245 static int dev_get_valid_name(struct net *net, struct net_device *dev,
1250 if (!dev_valid_name(name))
1253 if (strchr(name, '%'))
1254 return dev_alloc_name_ns(net, dev, name);
1255 else if (__dev_get_by_name(net, name))
1257 else if (dev->name != name)
1258 strlcpy(dev->name, name, IFNAMSIZ);
1264 * dev_change_name - change name of a device
1266 * @newname: name (or format string) must be at least IFNAMSIZ
1268 * Change name of a device, can pass format strings "eth%d".
1271 int dev_change_name(struct net_device *dev, const char *newname)
1273 unsigned char old_assign_type;
1274 char oldname[IFNAMSIZ];
1280 BUG_ON(!dev_net(dev));
1284 /* Some auto-enslaved devices e.g. failover slaves are
1285 * special, as userspace might rename the device after
1286 * the interface had been brought up and running since
1287 * the point kernel initiated auto-enslavement. Allow
1288 * live name change even when these slave devices are
1291 * Typically, users of these auto-enslaving devices
1292 * don't actually care about slave name change, as
1293 * they are supposed to operate on master interface
1296 if (dev->flags & IFF_UP &&
1297 likely(!(dev->priv_flags & IFF_LIVE_RENAME_OK)))
1300 down_write(&devnet_rename_sem);
1302 if (strncmp(newname, dev->name, IFNAMSIZ) == 0) {
1303 up_write(&devnet_rename_sem);
1307 memcpy(oldname, dev->name, IFNAMSIZ);
1309 err = dev_get_valid_name(net, dev, newname);
1311 up_write(&devnet_rename_sem);
1315 if (oldname[0] && !strchr(oldname, '%'))
1316 netdev_info(dev, "renamed from %s\n", oldname);
1318 old_assign_type = dev->name_assign_type;
1319 dev->name_assign_type = NET_NAME_RENAMED;
1322 ret = device_rename(&dev->dev, dev->name);
1324 memcpy(dev->name, oldname, IFNAMSIZ);
1325 dev->name_assign_type = old_assign_type;
1326 up_write(&devnet_rename_sem);
1330 up_write(&devnet_rename_sem);
1332 netdev_adjacent_rename_links(dev, oldname);
1334 write_lock_bh(&dev_base_lock);
1335 netdev_name_node_del(dev->name_node);
1336 write_unlock_bh(&dev_base_lock);
1340 write_lock_bh(&dev_base_lock);
1341 netdev_name_node_add(net, dev->name_node);
1342 write_unlock_bh(&dev_base_lock);
1344 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1345 ret = notifier_to_errno(ret);
1348 /* err >= 0 after dev_alloc_name() or stores the first errno */
1351 down_write(&devnet_rename_sem);
1352 memcpy(dev->name, oldname, IFNAMSIZ);
1353 memcpy(oldname, newname, IFNAMSIZ);
1354 dev->name_assign_type = old_assign_type;
1355 old_assign_type = NET_NAME_RENAMED;
1358 pr_err("%s: name change rollback failed: %d\n",
1367 * dev_set_alias - change ifalias of a device
1369 * @alias: name up to IFALIASZ
1370 * @len: limit of bytes to copy from info
1372 * Set ifalias for a device,
1374 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1376 struct dev_ifalias *new_alias = NULL;
1378 if (len >= IFALIASZ)
1382 new_alias = kmalloc(sizeof(*new_alias) + len + 1, GFP_KERNEL);
1386 memcpy(new_alias->ifalias, alias, len);
1387 new_alias->ifalias[len] = 0;
1390 mutex_lock(&ifalias_mutex);
1391 new_alias = rcu_replace_pointer(dev->ifalias, new_alias,
1392 mutex_is_locked(&ifalias_mutex));
1393 mutex_unlock(&ifalias_mutex);
1396 kfree_rcu(new_alias, rcuhead);
1400 EXPORT_SYMBOL(dev_set_alias);
1403 * dev_get_alias - get ifalias of a device
1405 * @name: buffer to store name of ifalias
1406 * @len: size of buffer
1408 * get ifalias for a device. Caller must make sure dev cannot go
1409 * away, e.g. rcu read lock or own a reference count to device.
1411 int dev_get_alias(const struct net_device *dev, char *name, size_t len)
1413 const struct dev_ifalias *alias;
1417 alias = rcu_dereference(dev->ifalias);
1419 ret = snprintf(name, len, "%s", alias->ifalias);
1426 * netdev_features_change - device changes features
1427 * @dev: device to cause notification
1429 * Called to indicate a device has changed features.
1431 void netdev_features_change(struct net_device *dev)
1433 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1435 EXPORT_SYMBOL(netdev_features_change);
1438 * netdev_state_change - device changes state
1439 * @dev: device to cause notification
1441 * Called to indicate a device has changed state. This function calls
1442 * the notifier chains for netdev_chain and sends a NEWLINK message
1443 * to the routing socket.
1445 void netdev_state_change(struct net_device *dev)
1447 if (dev->flags & IFF_UP) {
1448 struct netdev_notifier_change_info change_info = {
1452 call_netdevice_notifiers_info(NETDEV_CHANGE,
1454 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
1457 EXPORT_SYMBOL(netdev_state_change);
1460 * netdev_notify_peers - notify network peers about existence of @dev
1461 * @dev: network device
1463 * Generate traffic such that interested network peers are aware of
1464 * @dev, such as by generating a gratuitous ARP. This may be used when
1465 * a device wants to inform the rest of the network about some sort of
1466 * reconfiguration such as a failover event or virtual machine
1469 void netdev_notify_peers(struct net_device *dev)
1472 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
1473 call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev);
1476 EXPORT_SYMBOL(netdev_notify_peers);
1478 static int __dev_open(struct net_device *dev, struct netlink_ext_ack *extack)
1480 const struct net_device_ops *ops = dev->netdev_ops;
1485 if (!netif_device_present(dev)) {
1486 /* may be detached because parent is runtime-suspended */
1487 if (dev->dev.parent)
1488 pm_runtime_resume(dev->dev.parent);
1489 if (!netif_device_present(dev))
1493 /* Block netpoll from trying to do any rx path servicing.
1494 * If we don't do this there is a chance ndo_poll_controller
1495 * or ndo_poll may be running while we open the device
1497 netpoll_poll_disable(dev);
1499 ret = call_netdevice_notifiers_extack(NETDEV_PRE_UP, dev, extack);
1500 ret = notifier_to_errno(ret);
1504 set_bit(__LINK_STATE_START, &dev->state);
1506 if (ops->ndo_validate_addr)
1507 ret = ops->ndo_validate_addr(dev);
1509 if (!ret && ops->ndo_open)
1510 ret = ops->ndo_open(dev);
1512 netpoll_poll_enable(dev);
1515 clear_bit(__LINK_STATE_START, &dev->state);
1517 dev->flags |= IFF_UP;
1518 dev_set_rx_mode(dev);
1520 add_device_randomness(dev->dev_addr, dev->addr_len);
1527 * dev_open - prepare an interface for use.
1528 * @dev: device to open
1529 * @extack: netlink extended ack
1531 * Takes a device from down to up state. The device's private open
1532 * function is invoked and then the multicast lists are loaded. Finally
1533 * the device is moved into the up state and a %NETDEV_UP message is
1534 * sent to the netdev notifier chain.
1536 * Calling this function on an active interface is a nop. On a failure
1537 * a negative errno code is returned.
1539 int dev_open(struct net_device *dev, struct netlink_ext_ack *extack)
1543 if (dev->flags & IFF_UP)
1546 ret = __dev_open(dev, extack);
1550 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
1551 call_netdevice_notifiers(NETDEV_UP, dev);
1555 EXPORT_SYMBOL(dev_open);
1557 static void __dev_close_many(struct list_head *head)
1559 struct net_device *dev;
1564 list_for_each_entry(dev, head, close_list) {
1565 /* Temporarily disable netpoll until the interface is down */
1566 netpoll_poll_disable(dev);
1568 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1570 clear_bit(__LINK_STATE_START, &dev->state);
1572 /* Synchronize to scheduled poll. We cannot touch poll list, it
1573 * can be even on different cpu. So just clear netif_running().
1575 * dev->stop() will invoke napi_disable() on all of it's
1576 * napi_struct instances on this device.
1578 smp_mb__after_atomic(); /* Commit netif_running(). */
1581 dev_deactivate_many(head);
1583 list_for_each_entry(dev, head, close_list) {
1584 const struct net_device_ops *ops = dev->netdev_ops;
1587 * Call the device specific close. This cannot fail.
1588 * Only if device is UP
1590 * We allow it to be called even after a DETACH hot-plug
1596 dev->flags &= ~IFF_UP;
1597 netpoll_poll_enable(dev);
1601 static void __dev_close(struct net_device *dev)
1605 list_add(&dev->close_list, &single);
1606 __dev_close_many(&single);
1610 void dev_close_many(struct list_head *head, bool unlink)
1612 struct net_device *dev, *tmp;
1614 /* Remove the devices that don't need to be closed */
1615 list_for_each_entry_safe(dev, tmp, head, close_list)
1616 if (!(dev->flags & IFF_UP))
1617 list_del_init(&dev->close_list);
1619 __dev_close_many(head);
1621 list_for_each_entry_safe(dev, tmp, head, close_list) {
1622 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
1623 call_netdevice_notifiers(NETDEV_DOWN, dev);
1625 list_del_init(&dev->close_list);
1628 EXPORT_SYMBOL(dev_close_many);
1631 * dev_close - shutdown an interface.
1632 * @dev: device to shutdown
1634 * This function moves an active device into down state. A
1635 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1636 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1639 void dev_close(struct net_device *dev)
1641 if (dev->flags & IFF_UP) {
1644 list_add(&dev->close_list, &single);
1645 dev_close_many(&single, true);
1649 EXPORT_SYMBOL(dev_close);
1653 * dev_disable_lro - disable Large Receive Offload on a device
1656 * Disable Large Receive Offload (LRO) on a net device. Must be
1657 * called under RTNL. This is needed if received packets may be
1658 * forwarded to another interface.
1660 void dev_disable_lro(struct net_device *dev)
1662 struct net_device *lower_dev;
1663 struct list_head *iter;
1665 dev->wanted_features &= ~NETIF_F_LRO;
1666 netdev_update_features(dev);
1668 if (unlikely(dev->features & NETIF_F_LRO))
1669 netdev_WARN(dev, "failed to disable LRO!\n");
1671 netdev_for_each_lower_dev(dev, lower_dev, iter)
1672 dev_disable_lro(lower_dev);
1674 EXPORT_SYMBOL(dev_disable_lro);
1677 * dev_disable_gro_hw - disable HW Generic Receive Offload on a device
1680 * Disable HW Generic Receive Offload (GRO_HW) on a net device. Must be
1681 * called under RTNL. This is needed if Generic XDP is installed on
1684 static void dev_disable_gro_hw(struct net_device *dev)
1686 dev->wanted_features &= ~NETIF_F_GRO_HW;
1687 netdev_update_features(dev);
1689 if (unlikely(dev->features & NETIF_F_GRO_HW))
1690 netdev_WARN(dev, "failed to disable GRO_HW!\n");
1693 const char *netdev_cmd_to_name(enum netdev_cmd cmd)
1696 case NETDEV_##val: \
1697 return "NETDEV_" __stringify(val);
1699 N(UP) N(DOWN) N(REBOOT) N(CHANGE) N(REGISTER) N(UNREGISTER)
1700 N(CHANGEMTU) N(CHANGEADDR) N(GOING_DOWN) N(CHANGENAME) N(FEAT_CHANGE)
1701 N(BONDING_FAILOVER) N(PRE_UP) N(PRE_TYPE_CHANGE) N(POST_TYPE_CHANGE)
1702 N(POST_INIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN) N(CHANGEUPPER)
1703 N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA) N(BONDING_INFO)
1704 N(PRECHANGEUPPER) N(CHANGELOWERSTATE) N(UDP_TUNNEL_PUSH_INFO)
1705 N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN)
1706 N(CVLAN_FILTER_PUSH_INFO) N(CVLAN_FILTER_DROP_INFO)
1707 N(SVLAN_FILTER_PUSH_INFO) N(SVLAN_FILTER_DROP_INFO)
1711 return "UNKNOWN_NETDEV_EVENT";
1713 EXPORT_SYMBOL_GPL(netdev_cmd_to_name);
1715 static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val,
1716 struct net_device *dev)
1718 struct netdev_notifier_info info = {
1722 return nb->notifier_call(nb, val, &info);
1725 static int call_netdevice_register_notifiers(struct notifier_block *nb,
1726 struct net_device *dev)
1730 err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev);
1731 err = notifier_to_errno(err);
1735 if (!(dev->flags & IFF_UP))
1738 call_netdevice_notifier(nb, NETDEV_UP, dev);
1742 static void call_netdevice_unregister_notifiers(struct notifier_block *nb,
1743 struct net_device *dev)
1745 if (dev->flags & IFF_UP) {
1746 call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
1748 call_netdevice_notifier(nb, NETDEV_DOWN, dev);
1750 call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
1753 static int call_netdevice_register_net_notifiers(struct notifier_block *nb,
1756 struct net_device *dev;
1759 for_each_netdev(net, dev) {
1760 err = call_netdevice_register_notifiers(nb, dev);
1767 for_each_netdev_continue_reverse(net, dev)
1768 call_netdevice_unregister_notifiers(nb, dev);
1772 static void call_netdevice_unregister_net_notifiers(struct notifier_block *nb,
1775 struct net_device *dev;
1777 for_each_netdev(net, dev)
1778 call_netdevice_unregister_notifiers(nb, dev);
1781 static int dev_boot_phase = 1;
1784 * register_netdevice_notifier - register a network notifier block
1787 * Register a notifier to be called when network device events occur.
1788 * The notifier passed is linked into the kernel structures and must
1789 * not be reused until it has been unregistered. A negative errno code
1790 * is returned on a failure.
1792 * When registered all registration and up events are replayed
1793 * to the new notifier to allow device to have a race free
1794 * view of the network device list.
1797 int register_netdevice_notifier(struct notifier_block *nb)
1802 /* Close race with setup_net() and cleanup_net() */
1803 down_write(&pernet_ops_rwsem);
1805 err = raw_notifier_chain_register(&netdev_chain, nb);
1811 err = call_netdevice_register_net_notifiers(nb, net);
1818 up_write(&pernet_ops_rwsem);
1822 for_each_net_continue_reverse(net)
1823 call_netdevice_unregister_net_notifiers(nb, net);
1825 raw_notifier_chain_unregister(&netdev_chain, nb);
1828 EXPORT_SYMBOL(register_netdevice_notifier);
1831 * unregister_netdevice_notifier - unregister a network notifier block
1834 * Unregister a notifier previously registered by
1835 * register_netdevice_notifier(). The notifier is unlinked into the
1836 * kernel structures and may then be reused. A negative errno code
1837 * is returned on a failure.
1839 * After unregistering unregister and down device events are synthesized
1840 * for all devices on the device list to the removed notifier to remove
1841 * the need for special case cleanup code.
1844 int unregister_netdevice_notifier(struct notifier_block *nb)
1849 /* Close race with setup_net() and cleanup_net() */
1850 down_write(&pernet_ops_rwsem);
1852 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1857 call_netdevice_unregister_net_notifiers(nb, net);
1861 up_write(&pernet_ops_rwsem);
1864 EXPORT_SYMBOL(unregister_netdevice_notifier);
1866 static int __register_netdevice_notifier_net(struct net *net,
1867 struct notifier_block *nb,
1868 bool ignore_call_fail)
1872 err = raw_notifier_chain_register(&net->netdev_chain, nb);
1878 err = call_netdevice_register_net_notifiers(nb, net);
1879 if (err && !ignore_call_fail)
1880 goto chain_unregister;
1885 raw_notifier_chain_unregister(&net->netdev_chain, nb);
1889 static int __unregister_netdevice_notifier_net(struct net *net,
1890 struct notifier_block *nb)
1894 err = raw_notifier_chain_unregister(&net->netdev_chain, nb);
1898 call_netdevice_unregister_net_notifiers(nb, net);
1903 * register_netdevice_notifier_net - register a per-netns network notifier block
1904 * @net: network namespace
1907 * Register a notifier to be called when network device events occur.
1908 * The notifier passed is linked into the kernel structures and must
1909 * not be reused until it has been unregistered. A negative errno code
1910 * is returned on a failure.
1912 * When registered all registration and up events are replayed
1913 * to the new notifier to allow device to have a race free
1914 * view of the network device list.
1917 int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb)
1922 err = __register_netdevice_notifier_net(net, nb, false);
1926 EXPORT_SYMBOL(register_netdevice_notifier_net);
1929 * unregister_netdevice_notifier_net - unregister a per-netns
1930 * network notifier block
1931 * @net: network namespace
1934 * Unregister a notifier previously registered by
1935 * register_netdevice_notifier(). The notifier is unlinked into the
1936 * kernel structures and may then be reused. A negative errno code
1937 * is returned on a failure.
1939 * After unregistering unregister and down device events are synthesized
1940 * for all devices on the device list to the removed notifier to remove
1941 * the need for special case cleanup code.
1944 int unregister_netdevice_notifier_net(struct net *net,
1945 struct notifier_block *nb)
1950 err = __unregister_netdevice_notifier_net(net, nb);
1954 EXPORT_SYMBOL(unregister_netdevice_notifier_net);
1956 int register_netdevice_notifier_dev_net(struct net_device *dev,
1957 struct notifier_block *nb,
1958 struct netdev_net_notifier *nn)
1963 err = __register_netdevice_notifier_net(dev_net(dev), nb, false);
1966 list_add(&nn->list, &dev->net_notifier_list);
1971 EXPORT_SYMBOL(register_netdevice_notifier_dev_net);
1973 int unregister_netdevice_notifier_dev_net(struct net_device *dev,
1974 struct notifier_block *nb,
1975 struct netdev_net_notifier *nn)
1980 list_del(&nn->list);
1981 err = __unregister_netdevice_notifier_net(dev_net(dev), nb);
1985 EXPORT_SYMBOL(unregister_netdevice_notifier_dev_net);
1987 static void move_netdevice_notifiers_dev_net(struct net_device *dev,
1990 struct netdev_net_notifier *nn;
1992 list_for_each_entry(nn, &dev->net_notifier_list, list) {
1993 __unregister_netdevice_notifier_net(dev_net(dev), nn->nb);
1994 __register_netdevice_notifier_net(net, nn->nb, true);
1999 * call_netdevice_notifiers_info - call all network notifier blocks
2000 * @val: value passed unmodified to notifier function
2001 * @info: notifier information data
2003 * Call all network notifier blocks. Parameters and return value
2004 * are as for raw_notifier_call_chain().
2007 static int call_netdevice_notifiers_info(unsigned long val,
2008 struct netdev_notifier_info *info)
2010 struct net *net = dev_net(info->dev);
2015 /* Run per-netns notifier block chain first, then run the global one.
2016 * Hopefully, one day, the global one is going to be removed after
2017 * all notifier block registrators get converted to be per-netns.
2019 ret = raw_notifier_call_chain(&net->netdev_chain, val, info);
2020 if (ret & NOTIFY_STOP_MASK)
2022 return raw_notifier_call_chain(&netdev_chain, val, info);
2025 static int call_netdevice_notifiers_extack(unsigned long val,
2026 struct net_device *dev,
2027 struct netlink_ext_ack *extack)
2029 struct netdev_notifier_info info = {
2034 return call_netdevice_notifiers_info(val, &info);
2038 * call_netdevice_notifiers - call all network notifier blocks
2039 * @val: value passed unmodified to notifier function
2040 * @dev: net_device pointer passed unmodified to notifier function
2042 * Call all network notifier blocks. Parameters and return value
2043 * are as for raw_notifier_call_chain().
2046 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
2048 return call_netdevice_notifiers_extack(val, dev, NULL);
2050 EXPORT_SYMBOL(call_netdevice_notifiers);
2053 * call_netdevice_notifiers_mtu - call all network notifier blocks
2054 * @val: value passed unmodified to notifier function
2055 * @dev: net_device pointer passed unmodified to notifier function
2056 * @arg: additional u32 argument passed to the notifier function
2058 * Call all network notifier blocks. Parameters and return value
2059 * are as for raw_notifier_call_chain().
2061 static int call_netdevice_notifiers_mtu(unsigned long val,
2062 struct net_device *dev, u32 arg)
2064 struct netdev_notifier_info_ext info = {
2069 BUILD_BUG_ON(offsetof(struct netdev_notifier_info_ext, info) != 0);
2071 return call_netdevice_notifiers_info(val, &info.info);
2074 #ifdef CONFIG_NET_INGRESS
2075 static DEFINE_STATIC_KEY_FALSE(ingress_needed_key);
2077 void net_inc_ingress_queue(void)
2079 static_branch_inc(&ingress_needed_key);
2081 EXPORT_SYMBOL_GPL(net_inc_ingress_queue);
2083 void net_dec_ingress_queue(void)
2085 static_branch_dec(&ingress_needed_key);
2087 EXPORT_SYMBOL_GPL(net_dec_ingress_queue);
2090 #ifdef CONFIG_NET_EGRESS
2091 static DEFINE_STATIC_KEY_FALSE(egress_needed_key);
2093 void net_inc_egress_queue(void)
2095 static_branch_inc(&egress_needed_key);
2097 EXPORT_SYMBOL_GPL(net_inc_egress_queue);
2099 void net_dec_egress_queue(void)
2101 static_branch_dec(&egress_needed_key);
2103 EXPORT_SYMBOL_GPL(net_dec_egress_queue);
2106 static DEFINE_STATIC_KEY_FALSE(netstamp_needed_key);
2107 #ifdef CONFIG_JUMP_LABEL
2108 static atomic_t netstamp_needed_deferred;
2109 static atomic_t netstamp_wanted;
2110 static void netstamp_clear(struct work_struct *work)
2112 int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
2115 wanted = atomic_add_return(deferred, &netstamp_wanted);
2117 static_branch_enable(&netstamp_needed_key);
2119 static_branch_disable(&netstamp_needed_key);
2121 static DECLARE_WORK(netstamp_work, netstamp_clear);
2124 void net_enable_timestamp(void)
2126 #ifdef CONFIG_JUMP_LABEL
2130 wanted = atomic_read(&netstamp_wanted);
2133 if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted + 1) == wanted)
2136 atomic_inc(&netstamp_needed_deferred);
2137 schedule_work(&netstamp_work);
2139 static_branch_inc(&netstamp_needed_key);
2142 EXPORT_SYMBOL(net_enable_timestamp);
2144 void net_disable_timestamp(void)
2146 #ifdef CONFIG_JUMP_LABEL
2150 wanted = atomic_read(&netstamp_wanted);
2153 if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted - 1) == wanted)
2156 atomic_dec(&netstamp_needed_deferred);
2157 schedule_work(&netstamp_work);
2159 static_branch_dec(&netstamp_needed_key);
2162 EXPORT_SYMBOL(net_disable_timestamp);
2164 static inline void net_timestamp_set(struct sk_buff *skb)
2167 if (static_branch_unlikely(&netstamp_needed_key))
2168 __net_timestamp(skb);
2171 #define net_timestamp_check(COND, SKB) \
2172 if (static_branch_unlikely(&netstamp_needed_key)) { \
2173 if ((COND) && !(SKB)->tstamp) \
2174 __net_timestamp(SKB); \
2177 bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb)
2181 if (!(dev->flags & IFF_UP))
2184 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
2185 if (skb->len <= len)
2188 /* if TSO is enabled, we don't care about the length as the packet
2189 * could be forwarded without being segmented before
2191 if (skb_is_gso(skb))
2196 EXPORT_SYMBOL_GPL(is_skb_forwardable);
2198 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
2200 int ret = ____dev_forward_skb(dev, skb);
2203 skb->protocol = eth_type_trans(skb, dev);
2204 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
2209 EXPORT_SYMBOL_GPL(__dev_forward_skb);
2212 * dev_forward_skb - loopback an skb to another netif
2214 * @dev: destination network device
2215 * @skb: buffer to forward
2218 * NET_RX_SUCCESS (no congestion)
2219 * NET_RX_DROP (packet was dropped, but freed)
2221 * dev_forward_skb can be used for injecting an skb from the
2222 * start_xmit function of one device into the receive queue
2223 * of another device.
2225 * The receiving device may be in another namespace, so
2226 * we have to clear all information in the skb that could
2227 * impact namespace isolation.
2229 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
2231 return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb);
2233 EXPORT_SYMBOL_GPL(dev_forward_skb);
2235 static inline int deliver_skb(struct sk_buff *skb,
2236 struct packet_type *pt_prev,
2237 struct net_device *orig_dev)
2239 if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC)))
2241 refcount_inc(&skb->users);
2242 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2245 static inline void deliver_ptype_list_skb(struct sk_buff *skb,
2246 struct packet_type **pt,
2247 struct net_device *orig_dev,
2249 struct list_head *ptype_list)
2251 struct packet_type *ptype, *pt_prev = *pt;
2253 list_for_each_entry_rcu(ptype, ptype_list, list) {
2254 if (ptype->type != type)
2257 deliver_skb(skb, pt_prev, orig_dev);
2263 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
2265 if (!ptype->af_packet_priv || !skb->sk)
2268 if (ptype->id_match)
2269 return ptype->id_match(ptype, skb->sk);
2270 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
2277 * dev_nit_active - return true if any network interface taps are in use
2279 * @dev: network device to check for the presence of taps
2281 bool dev_nit_active(struct net_device *dev)
2283 return !list_empty(&ptype_all) || !list_empty(&dev->ptype_all);
2285 EXPORT_SYMBOL_GPL(dev_nit_active);
2288 * Support routine. Sends outgoing frames to any network
2289 * taps currently in use.
2292 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
2294 struct packet_type *ptype;
2295 struct sk_buff *skb2 = NULL;
2296 struct packet_type *pt_prev = NULL;
2297 struct list_head *ptype_list = &ptype_all;
2301 list_for_each_entry_rcu(ptype, ptype_list, list) {
2302 if (ptype->ignore_outgoing)
2305 /* Never send packets back to the socket
2306 * they originated from - MvS (miquels@drinkel.ow.org)
2308 if (skb_loop_sk(ptype, skb))
2312 deliver_skb(skb2, pt_prev, skb->dev);
2317 /* need to clone skb, done only once */
2318 skb2 = skb_clone(skb, GFP_ATOMIC);
2322 net_timestamp_set(skb2);
2324 /* skb->nh should be correctly
2325 * set by sender, so that the second statement is
2326 * just protection against buggy protocols.
2328 skb_reset_mac_header(skb2);
2330 if (skb_network_header(skb2) < skb2->data ||
2331 skb_network_header(skb2) > skb_tail_pointer(skb2)) {
2332 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
2333 ntohs(skb2->protocol),
2335 skb_reset_network_header(skb2);
2338 skb2->transport_header = skb2->network_header;
2339 skb2->pkt_type = PACKET_OUTGOING;
2343 if (ptype_list == &ptype_all) {
2344 ptype_list = &dev->ptype_all;
2349 if (!skb_orphan_frags_rx(skb2, GFP_ATOMIC))
2350 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
2356 EXPORT_SYMBOL_GPL(dev_queue_xmit_nit);
2359 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
2360 * @dev: Network device
2361 * @txq: number of queues available
2363 * If real_num_tx_queues is changed the tc mappings may no longer be
2364 * valid. To resolve this verify the tc mapping remains valid and if
2365 * not NULL the mapping. With no priorities mapping to this
2366 * offset/count pair it will no longer be used. In the worst case TC0
2367 * is invalid nothing can be done so disable priority mappings. If is
2368 * expected that drivers will fix this mapping if they can before
2369 * calling netif_set_real_num_tx_queues.
2371 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
2374 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
2376 /* If TC0 is invalidated disable TC mapping */
2377 if (tc->offset + tc->count > txq) {
2378 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
2383 /* Invalidated prio to tc mappings set to TC0 */
2384 for (i = 1; i < TC_BITMASK + 1; i++) {
2385 int q = netdev_get_prio_tc_map(dev, i);
2387 tc = &dev->tc_to_txq[q];
2388 if (tc->offset + tc->count > txq) {
2389 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
2391 netdev_set_prio_tc_map(dev, i, 0);
2396 int netdev_txq_to_tc(struct net_device *dev, unsigned int txq)
2399 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
2402 /* walk through the TCs and see if it falls into any of them */
2403 for (i = 0; i < TC_MAX_QUEUE; i++, tc++) {
2404 if ((txq - tc->offset) < tc->count)
2408 /* didn't find it, just return -1 to indicate no match */
2414 EXPORT_SYMBOL(netdev_txq_to_tc);
2417 struct static_key xps_needed __read_mostly;
2418 EXPORT_SYMBOL(xps_needed);
2419 struct static_key xps_rxqs_needed __read_mostly;
2420 EXPORT_SYMBOL(xps_rxqs_needed);
2421 static DEFINE_MUTEX(xps_map_mutex);
2422 #define xmap_dereference(P) \
2423 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
2425 static bool remove_xps_queue(struct xps_dev_maps *dev_maps,
2428 struct xps_map *map = NULL;
2432 map = xmap_dereference(dev_maps->attr_map[tci]);
2436 for (pos = map->len; pos--;) {
2437 if (map->queues[pos] != index)
2441 map->queues[pos] = map->queues[--map->len];
2445 RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL);
2446 kfree_rcu(map, rcu);
2453 static bool remove_xps_queue_cpu(struct net_device *dev,
2454 struct xps_dev_maps *dev_maps,
2455 int cpu, u16 offset, u16 count)
2457 int num_tc = dev->num_tc ? : 1;
2458 bool active = false;
2461 for (tci = cpu * num_tc; num_tc--; tci++) {
2464 for (i = count, j = offset; i--; j++) {
2465 if (!remove_xps_queue(dev_maps, tci, j))
2475 static void reset_xps_maps(struct net_device *dev,
2476 struct xps_dev_maps *dev_maps,
2480 static_key_slow_dec_cpuslocked(&xps_rxqs_needed);
2481 RCU_INIT_POINTER(dev->xps_rxqs_map, NULL);
2483 RCU_INIT_POINTER(dev->xps_cpus_map, NULL);
2485 static_key_slow_dec_cpuslocked(&xps_needed);
2486 kfree_rcu(dev_maps, rcu);
2489 static void clean_xps_maps(struct net_device *dev, const unsigned long *mask,
2490 struct xps_dev_maps *dev_maps, unsigned int nr_ids,
2491 u16 offset, u16 count, bool is_rxqs_map)
2493 bool active = false;
2496 for (j = -1; j = netif_attrmask_next(j, mask, nr_ids),
2498 active |= remove_xps_queue_cpu(dev, dev_maps, j, offset,
2501 reset_xps_maps(dev, dev_maps, is_rxqs_map);
2504 for (i = offset + (count - 1); count--; i--) {
2505 netdev_queue_numa_node_write(
2506 netdev_get_tx_queue(dev, i),
2512 static void netif_reset_xps_queues(struct net_device *dev, u16 offset,
2515 const unsigned long *possible_mask = NULL;
2516 struct xps_dev_maps *dev_maps;
2517 unsigned int nr_ids;
2519 if (!static_key_false(&xps_needed))
2523 mutex_lock(&xps_map_mutex);
2525 if (static_key_false(&xps_rxqs_needed)) {
2526 dev_maps = xmap_dereference(dev->xps_rxqs_map);
2528 nr_ids = dev->num_rx_queues;
2529 clean_xps_maps(dev, possible_mask, dev_maps, nr_ids,
2530 offset, count, true);
2534 dev_maps = xmap_dereference(dev->xps_cpus_map);
2538 if (num_possible_cpus() > 1)
2539 possible_mask = cpumask_bits(cpu_possible_mask);
2540 nr_ids = nr_cpu_ids;
2541 clean_xps_maps(dev, possible_mask, dev_maps, nr_ids, offset, count,
2545 mutex_unlock(&xps_map_mutex);
2549 static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index)
2551 netif_reset_xps_queues(dev, index, dev->num_tx_queues - index);
2554 static struct xps_map *expand_xps_map(struct xps_map *map, int attr_index,
2555 u16 index, bool is_rxqs_map)
2557 struct xps_map *new_map;
2558 int alloc_len = XPS_MIN_MAP_ALLOC;
2561 for (pos = 0; map && pos < map->len; pos++) {
2562 if (map->queues[pos] != index)
2567 /* Need to add tx-queue to this CPU's/rx-queue's existing map */
2569 if (pos < map->alloc_len)
2572 alloc_len = map->alloc_len * 2;
2575 /* Need to allocate new map to store tx-queue on this CPU's/rx-queue's
2579 new_map = kzalloc(XPS_MAP_SIZE(alloc_len), GFP_KERNEL);
2581 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL,
2582 cpu_to_node(attr_index));
2586 for (i = 0; i < pos; i++)
2587 new_map->queues[i] = map->queues[i];
2588 new_map->alloc_len = alloc_len;
2594 /* Must be called under cpus_read_lock */
2595 int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
2596 u16 index, bool is_rxqs_map)
2598 const unsigned long *online_mask = NULL, *possible_mask = NULL;
2599 struct xps_dev_maps *dev_maps, *new_dev_maps = NULL;
2600 int i, j, tci, numa_node_id = -2;
2601 int maps_sz, num_tc = 1, tc = 0;
2602 struct xps_map *map, *new_map;
2603 bool active = false;
2604 unsigned int nr_ids;
2607 /* Do not allow XPS on subordinate device directly */
2608 num_tc = dev->num_tc;
2612 /* If queue belongs to subordinate dev use its map */
2613 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
2615 tc = netdev_txq_to_tc(dev, index);
2620 mutex_lock(&xps_map_mutex);
2622 maps_sz = XPS_RXQ_DEV_MAPS_SIZE(num_tc, dev->num_rx_queues);
2623 dev_maps = xmap_dereference(dev->xps_rxqs_map);
2624 nr_ids = dev->num_rx_queues;
2626 maps_sz = XPS_CPU_DEV_MAPS_SIZE(num_tc);
2627 if (num_possible_cpus() > 1) {
2628 online_mask = cpumask_bits(cpu_online_mask);
2629 possible_mask = cpumask_bits(cpu_possible_mask);
2631 dev_maps = xmap_dereference(dev->xps_cpus_map);
2632 nr_ids = nr_cpu_ids;
2635 if (maps_sz < L1_CACHE_BYTES)
2636 maps_sz = L1_CACHE_BYTES;
2638 /* allocate memory for queue storage */
2639 for (j = -1; j = netif_attrmask_next_and(j, online_mask, mask, nr_ids),
2642 new_dev_maps = kzalloc(maps_sz, GFP_KERNEL);
2643 if (!new_dev_maps) {
2644 mutex_unlock(&xps_map_mutex);
2648 tci = j * num_tc + tc;
2649 map = dev_maps ? xmap_dereference(dev_maps->attr_map[tci]) :
2652 map = expand_xps_map(map, j, index, is_rxqs_map);
2656 RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);
2660 goto out_no_new_maps;
2663 /* Increment static keys at most once per type */
2664 static_key_slow_inc_cpuslocked(&xps_needed);
2666 static_key_slow_inc_cpuslocked(&xps_rxqs_needed);
2669 for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids),
2671 /* copy maps belonging to foreign traffic classes */
2672 for (i = tc, tci = j * num_tc; dev_maps && i--; tci++) {
2673 /* fill in the new device map from the old device map */
2674 map = xmap_dereference(dev_maps->attr_map[tci]);
2675 RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);
2678 /* We need to explicitly update tci as prevous loop
2679 * could break out early if dev_maps is NULL.
2681 tci = j * num_tc + tc;
2683 if (netif_attr_test_mask(j, mask, nr_ids) &&
2684 netif_attr_test_online(j, online_mask, nr_ids)) {
2685 /* add tx-queue to CPU/rx-queue maps */
2688 map = xmap_dereference(new_dev_maps->attr_map[tci]);
2689 while ((pos < map->len) && (map->queues[pos] != index))
2692 if (pos == map->len)
2693 map->queues[map->len++] = index;
2696 if (numa_node_id == -2)
2697 numa_node_id = cpu_to_node(j);
2698 else if (numa_node_id != cpu_to_node(j))
2702 } else if (dev_maps) {
2703 /* fill in the new device map from the old device map */
2704 map = xmap_dereference(dev_maps->attr_map[tci]);
2705 RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);
2708 /* copy maps belonging to foreign traffic classes */
2709 for (i = num_tc - tc, tci++; dev_maps && --i; tci++) {
2710 /* fill in the new device map from the old device map */
2711 map = xmap_dereference(dev_maps->attr_map[tci]);
2712 RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map);
2717 rcu_assign_pointer(dev->xps_rxqs_map, new_dev_maps);
2719 rcu_assign_pointer(dev->xps_cpus_map, new_dev_maps);
2721 /* Cleanup old maps */
2723 goto out_no_old_maps;
2725 for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids),
2727 for (i = num_tc, tci = j * num_tc; i--; tci++) {
2728 new_map = xmap_dereference(new_dev_maps->attr_map[tci]);
2729 map = xmap_dereference(dev_maps->attr_map[tci]);
2730 if (map && map != new_map)
2731 kfree_rcu(map, rcu);
2735 kfree_rcu(dev_maps, rcu);
2738 dev_maps = new_dev_maps;
2743 /* update Tx queue numa node */
2744 netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index),
2745 (numa_node_id >= 0) ?
2746 numa_node_id : NUMA_NO_NODE);
2752 /* removes tx-queue from unused CPUs/rx-queues */
2753 for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids),
2755 for (i = tc, tci = j * num_tc; i--; tci++)
2756 active |= remove_xps_queue(dev_maps, tci, index);
2757 if (!netif_attr_test_mask(j, mask, nr_ids) ||
2758 !netif_attr_test_online(j, online_mask, nr_ids))
2759 active |= remove_xps_queue(dev_maps, tci, index);
2760 for (i = num_tc - tc, tci++; --i; tci++)
2761 active |= remove_xps_queue(dev_maps, tci, index);
2764 /* free map if not active */
2766 reset_xps_maps(dev, dev_maps, is_rxqs_map);
2769 mutex_unlock(&xps_map_mutex);
2773 /* remove any maps that we added */
2774 for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids),
2776 for (i = num_tc, tci = j * num_tc; i--; tci++) {
2777 new_map = xmap_dereference(new_dev_maps->attr_map[tci]);
2779 xmap_dereference(dev_maps->attr_map[tci]) :
2781 if (new_map && new_map != map)
2786 mutex_unlock(&xps_map_mutex);
2788 kfree(new_dev_maps);
2791 EXPORT_SYMBOL_GPL(__netif_set_xps_queue);
2793 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
2799 ret = __netif_set_xps_queue(dev, cpumask_bits(mask), index, false);
2804 EXPORT_SYMBOL(netif_set_xps_queue);
2807 static void netdev_unbind_all_sb_channels(struct net_device *dev)
2809 struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues];
2811 /* Unbind any subordinate channels */
2812 while (txq-- != &dev->_tx[0]) {
2814 netdev_unbind_sb_channel(dev, txq->sb_dev);
2818 void netdev_reset_tc(struct net_device *dev)
2821 netif_reset_xps_queues_gt(dev, 0);
2823 netdev_unbind_all_sb_channels(dev);
2825 /* Reset TC configuration of device */
2827 memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
2828 memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
2830 EXPORT_SYMBOL(netdev_reset_tc);
2832 int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
2834 if (tc >= dev->num_tc)
2838 netif_reset_xps_queues(dev, offset, count);
2840 dev->tc_to_txq[tc].count = count;
2841 dev->tc_to_txq[tc].offset = offset;
2844 EXPORT_SYMBOL(netdev_set_tc_queue);
2846 int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
2848 if (num_tc > TC_MAX_QUEUE)
2852 netif_reset_xps_queues_gt(dev, 0);
2854 netdev_unbind_all_sb_channels(dev);
2856 dev->num_tc = num_tc;
2859 EXPORT_SYMBOL(netdev_set_num_tc);
2861 void netdev_unbind_sb_channel(struct net_device *dev,
2862 struct net_device *sb_dev)
2864 struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues];
2867 netif_reset_xps_queues_gt(sb_dev, 0);
2869 memset(sb_dev->tc_to_txq, 0, sizeof(sb_dev->tc_to_txq));
2870 memset(sb_dev->prio_tc_map, 0, sizeof(sb_dev->prio_tc_map));
2872 while (txq-- != &dev->_tx[0]) {
2873 if (txq->sb_dev == sb_dev)
2877 EXPORT_SYMBOL(netdev_unbind_sb_channel);
2879 int netdev_bind_sb_channel_queue(struct net_device *dev,
2880 struct net_device *sb_dev,
2881 u8 tc, u16 count, u16 offset)
2883 /* Make certain the sb_dev and dev are already configured */
2884 if (sb_dev->num_tc >= 0 || tc >= dev->num_tc)
2887 /* We cannot hand out queues we don't have */
2888 if ((offset + count) > dev->real_num_tx_queues)
2891 /* Record the mapping */
2892 sb_dev->tc_to_txq[tc].count = count;
2893 sb_dev->tc_to_txq[tc].offset = offset;
2895 /* Provide a way for Tx queue to find the tc_to_txq map or
2896 * XPS map for itself.
2899 netdev_get_tx_queue(dev, count + offset)->sb_dev = sb_dev;
2903 EXPORT_SYMBOL(netdev_bind_sb_channel_queue);
2905 int netdev_set_sb_channel(struct net_device *dev, u16 channel)
2907 /* Do not use a multiqueue device to represent a subordinate channel */
2908 if (netif_is_multiqueue(dev))
2911 /* We allow channels 1 - 32767 to be used for subordinate channels.
2912 * Channel 0 is meant to be "native" mode and used only to represent
2913 * the main root device. We allow writing 0 to reset the device back
2914 * to normal mode after being used as a subordinate channel.
2916 if (channel > S16_MAX)
2919 dev->num_tc = -channel;
2923 EXPORT_SYMBOL(netdev_set_sb_channel);
2926 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2927 * greater than real_num_tx_queues stale skbs on the qdisc must be flushed.
2929 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
2934 disabling = txq < dev->real_num_tx_queues;
2936 if (txq < 1 || txq > dev->num_tx_queues)
2939 if (dev->reg_state == NETREG_REGISTERED ||
2940 dev->reg_state == NETREG_UNREGISTERING) {
2943 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
2949 netif_setup_tc(dev, txq);
2951 dev->real_num_tx_queues = txq;
2955 qdisc_reset_all_tx_gt(dev, txq);
2957 netif_reset_xps_queues_gt(dev, txq);
2961 dev->real_num_tx_queues = txq;
2966 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
2970 * netif_set_real_num_rx_queues - set actual number of RX queues used
2971 * @dev: Network device
2972 * @rxq: Actual number of RX queues
2974 * This must be called either with the rtnl_lock held or before
2975 * registration of the net device. Returns 0 on success, or a
2976 * negative error code. If called before registration, it always
2979 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
2983 if (rxq < 1 || rxq > dev->num_rx_queues)
2986 if (dev->reg_state == NETREG_REGISTERED) {
2989 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
2995 dev->real_num_rx_queues = rxq;
2998 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
3002 * netif_get_num_default_rss_queues - default number of RSS queues
3004 * This routine should set an upper limit on the number of RSS queues
3005 * used by default by multiqueue devices.
3007 int netif_get_num_default_rss_queues(void)
3009 return is_kdump_kernel() ?
3010 1 : min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());
3012 EXPORT_SYMBOL(netif_get_num_default_rss_queues);
3014 static void __netif_reschedule(struct Qdisc *q)
3016 struct softnet_data *sd;
3017 unsigned long flags;
3019 local_irq_save(flags);
3020 sd = this_cpu_ptr(&softnet_data);
3021 q->next_sched = NULL;
3022 *sd->output_queue_tailp = q;
3023 sd->output_queue_tailp = &q->next_sched;
3024 raise_softirq_irqoff(NET_TX_SOFTIRQ);
3025 local_irq_restore(flags);
3028 void __netif_schedule(struct Qdisc *q)
3030 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
3031 __netif_reschedule(q);
3033 EXPORT_SYMBOL(__netif_schedule);
3035 struct dev_kfree_skb_cb {
3036 enum skb_free_reason reason;
3039 static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb)
3041 return (struct dev_kfree_skb_cb *)skb->cb;
3044 void netif_schedule_queue(struct netdev_queue *txq)
3047 if (!netif_xmit_stopped(txq)) {
3048 struct Qdisc *q = rcu_dereference(txq->qdisc);
3050 __netif_schedule(q);
3054 EXPORT_SYMBOL(netif_schedule_queue);
3056 void netif_tx_wake_queue(struct netdev_queue *dev_queue)
3058 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) {
3062 q = rcu_dereference(dev_queue->qdisc);
3063 __netif_schedule(q);
3067 EXPORT_SYMBOL(netif_tx_wake_queue);
3069 void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason)
3071 unsigned long flags;
3076 if (likely(refcount_read(&skb->users) == 1)) {
3078 refcount_set(&skb->users, 0);
3079 } else if (likely(!refcount_dec_and_test(&skb->users))) {
3082 get_kfree_skb_cb(skb)->reason = reason;
3083 local_irq_save(flags);
3084 skb->next = __this_cpu_read(softnet_data.completion_queue);
3085 __this_cpu_write(softnet_data.completion_queue, skb);
3086 raise_softirq_irqoff(NET_TX_SOFTIRQ);
3087 local_irq_restore(flags);
3089 EXPORT_SYMBOL(__dev_kfree_skb_irq);
3091 void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason)
3093 if (in_irq() || irqs_disabled())
3094 __dev_kfree_skb_irq(skb, reason);
3098 EXPORT_SYMBOL(__dev_kfree_skb_any);
3102 * netif_device_detach - mark device as removed
3103 * @dev: network device
3105 * Mark device as removed from system and therefore no longer available.
3107 void netif_device_detach(struct net_device *dev)
3109 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
3110 netif_running(dev)) {
3111 netif_tx_stop_all_queues(dev);
3114 EXPORT_SYMBOL(netif_device_detach);
3117 * netif_device_attach - mark device as attached
3118 * @dev: network device
3120 * Mark device as attached from system and restart if needed.
3122 void netif_device_attach(struct net_device *dev)
3124 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
3125 netif_running(dev)) {
3126 netif_tx_wake_all_queues(dev);
3127 __netdev_watchdog_up(dev);
3130 EXPORT_SYMBOL(netif_device_attach);
3133 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
3134 * to be used as a distribution range.
3136 static u16 skb_tx_hash(const struct net_device *dev,
3137 const struct net_device *sb_dev,
3138 struct sk_buff *skb)
3142 u16 qcount = dev->real_num_tx_queues;
3145 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
3147 qoffset = sb_dev->tc_to_txq[tc].offset;
3148 qcount = sb_dev->tc_to_txq[tc].count;
3151 if (skb_rx_queue_recorded(skb)) {
3152 hash = skb_get_rx_queue(skb);
3153 if (hash >= qoffset)
3155 while (unlikely(hash >= qcount))
3157 return hash + qoffset;
3160 return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset;
3163 static void skb_warn_bad_offload(const struct sk_buff *skb)
3165 static const netdev_features_t null_features;
3166 struct net_device *dev = skb->dev;
3167 const char *name = "";
3169 if (!net_ratelimit())
3173 if (dev->dev.parent)
3174 name = dev_driver_string(dev->dev.parent);
3176 name = netdev_name(dev);
3178 skb_dump(KERN_WARNING, skb, false);
3179 WARN(1, "%s: caps=(%pNF, %pNF)\n",
3180 name, dev ? &dev->features : &null_features,
3181 skb->sk ? &skb->sk->sk_route_caps : &null_features);
3185 * Invalidate hardware checksum when packet is to be mangled, and
3186 * complete checksum manually on outgoing path.
3188 int skb_checksum_help(struct sk_buff *skb)
3191 int ret = 0, offset;
3193 if (skb->ip_summed == CHECKSUM_COMPLETE)
3194 goto out_set_summed;
3196 if (unlikely(skb_is_gso(skb))) {
3197 skb_warn_bad_offload(skb);
3201 /* Before computing a checksum, we should make sure no frag could
3202 * be modified by an external entity : checksum could be wrong.
3204 if (skb_has_shared_frag(skb)) {
3205 ret = __skb_linearize(skb);
3210 offset = skb_checksum_start_offset(skb);
3211 BUG_ON(offset >= skb_headlen(skb));
3212 csum = skb_checksum(skb, offset, skb->len - offset, 0);
3214 offset += skb->csum_offset;
3215 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
3217 ret = skb_ensure_writable(skb, offset + sizeof(__sum16));
3221 *(__sum16 *)(skb->data + offset) = csum_fold(csum) ?: CSUM_MANGLED_0;
3223 skb->ip_summed = CHECKSUM_NONE;
3227 EXPORT_SYMBOL(skb_checksum_help);
3229 int skb_crc32c_csum_help(struct sk_buff *skb)
3232 int ret = 0, offset, start;
3234 if (skb->ip_summed != CHECKSUM_PARTIAL)
3237 if (unlikely(skb_is_gso(skb)))
3240 /* Before computing a checksum, we should make sure no frag could
3241 * be modified by an external entity : checksum could be wrong.
3243 if (unlikely(skb_has_shared_frag(skb))) {
3244 ret = __skb_linearize(skb);
3248 start = skb_checksum_start_offset(skb);
3249 offset = start + offsetof(struct sctphdr, checksum);
3250 if (WARN_ON_ONCE(offset >= skb_headlen(skb))) {
3255 ret = skb_ensure_writable(skb, offset + sizeof(__le32));
3259 crc32c_csum = cpu_to_le32(~__skb_checksum(skb, start,
3260 skb->len - start, ~(__u32)0,
3262 *(__le32 *)(skb->data + offset) = crc32c_csum;
3263 skb->ip_summed = CHECKSUM_NONE;
3264 skb->csum_not_inet = 0;
3269 __be16 skb_network_protocol(struct sk_buff *skb, int *depth)
3271 __be16 type = skb->protocol;
3273 /* Tunnel gso handlers can set protocol to ethernet. */
3274 if (type == htons(ETH_P_TEB)) {
3277 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
3280 eth = (struct ethhdr *)skb->data;
3281 type = eth->h_proto;
3284 return __vlan_get_protocol(skb, type, depth);
3288 * skb_mac_gso_segment - mac layer segmentation handler.
3289 * @skb: buffer to segment
3290 * @features: features for the output path (see dev->features)
3292 struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
3293 netdev_features_t features)
3295 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
3296 struct packet_offload *ptype;
3297 int vlan_depth = skb->mac_len;
3298 __be16 type = skb_network_protocol(skb, &vlan_depth);
3300 if (unlikely(!type))
3301 return ERR_PTR(-EINVAL);
3303 __skb_pull(skb, vlan_depth);
3306 list_for_each_entry_rcu(ptype, &offload_base, list) {
3307 if (ptype->type == type && ptype->callbacks.gso_segment) {
3308 segs = ptype->callbacks.gso_segment(skb, features);
3314 __skb_push(skb, skb->data - skb_mac_header(skb));
3318 EXPORT_SYMBOL(skb_mac_gso_segment);
3321 /* openvswitch calls this on rx path, so we need a different check.
3323 static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
3326 return skb->ip_summed != CHECKSUM_PARTIAL &&
3327 skb->ip_summed != CHECKSUM_UNNECESSARY;
3329 return skb->ip_summed == CHECKSUM_NONE;
3333 * __skb_gso_segment - Perform segmentation on skb.
3334 * @skb: buffer to segment
3335 * @features: features for the output path (see dev->features)
3336 * @tx_path: whether it is called in TX path
3338 * This function segments the given skb and returns a list of segments.
3340 * It may return NULL if the skb requires no segmentation. This is
3341 * only possible when GSO is used for verifying header integrity.
3343 * Segmentation preserves SKB_GSO_CB_OFFSET bytes of previous skb cb.
3345 struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
3346 netdev_features_t features, bool tx_path)
3348 struct sk_buff *segs;
3350 if (unlikely(skb_needs_check(skb, tx_path))) {
3353 /* We're going to init ->check field in TCP or UDP header */
3354 err = skb_cow_head(skb, 0);
3356 return ERR_PTR(err);
3359 /* Only report GSO partial support if it will enable us to
3360 * support segmentation on this frame without needing additional
3363 if (features & NETIF_F_GSO_PARTIAL) {
3364 netdev_features_t partial_features = NETIF_F_GSO_ROBUST;
3365 struct net_device *dev = skb->dev;
3367 partial_features |= dev->features & dev->gso_partial_features;
3368 if (!skb_gso_ok(skb, features | partial_features))
3369 features &= ~NETIF_F_GSO_PARTIAL;
3372 BUILD_BUG_ON(SKB_GSO_CB_OFFSET +
3373 sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb));
3375 SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb);
3376 SKB_GSO_CB(skb)->encap_level = 0;
3378 skb_reset_mac_header(skb);
3379 skb_reset_mac_len(skb);
3381 segs = skb_mac_gso_segment(skb, features);
3383 if (segs != skb && unlikely(skb_needs_check(skb, tx_path) && !IS_ERR(segs)))
3384 skb_warn_bad_offload(skb);
3388 EXPORT_SYMBOL(__skb_gso_segment);
3390 /* Take action when hardware reception checksum errors are detected. */
3392 void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb)
3394 if (net_ratelimit()) {
3395 pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
3396 skb_dump(KERN_ERR, skb, true);
3400 EXPORT_SYMBOL(netdev_rx_csum_fault);
3403 /* XXX: check that highmem exists at all on the given machine. */
3404 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
3406 #ifdef CONFIG_HIGHMEM
3409 if (!(dev->features & NETIF_F_HIGHDMA)) {
3410 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
3411 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
3413 if (PageHighMem(skb_frag_page(frag)))
3421 /* If MPLS offload request, verify we are testing hardware MPLS features
3422 * instead of standard features for the netdev.
3424 #if IS_ENABLED(CONFIG_NET_MPLS_GSO)
3425 static netdev_features_t net_mpls_features(struct sk_buff *skb,
3426 netdev_features_t features,
3429 if (eth_p_mpls(type))
3430 features &= skb->dev->mpls_features;
3435 static netdev_features_t net_mpls_features(struct sk_buff *skb,
3436 netdev_features_t features,
3443 static netdev_features_t harmonize_features(struct sk_buff *skb,
3444 netdev_features_t features)
3448 type = skb_network_protocol(skb, NULL);
3449 features = net_mpls_features(skb, features, type);
3451 if (skb->ip_summed != CHECKSUM_NONE &&
3452 !can_checksum_protocol(features, type)) {
3453 features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
3455 if (illegal_highdma(skb->dev, skb))
3456 features &= ~NETIF_F_SG;
3461 netdev_features_t passthru_features_check(struct sk_buff *skb,
3462 struct net_device *dev,
3463 netdev_features_t features)
3467 EXPORT_SYMBOL(passthru_features_check);
3469 static netdev_features_t dflt_features_check(struct sk_buff *skb,
3470 struct net_device *dev,
3471 netdev_features_t features)
3473 return vlan_features_check(skb, features);
3476 static netdev_features_t gso_features_check(const struct sk_buff *skb,
3477 struct net_device *dev,
3478 netdev_features_t features)
3480 u16 gso_segs = skb_shinfo(skb)->gso_segs;
3482 if (gso_segs > dev->gso_max_segs)
3483 return features & ~NETIF_F_GSO_MASK;
3485 if (!skb_shinfo(skb)->gso_type) {
3486 skb_warn_bad_offload(skb);
3487 return features & ~NETIF_F_GSO_MASK;
3490 /* Support for GSO partial features requires software
3491 * intervention before we can actually process the packets
3492 * so we need to strip support for any partial features now
3493 * and we can pull them back in after we have partially
3494 * segmented the frame.
3496 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL))
3497 features &= ~dev->gso_partial_features;
3499 /* Make sure to clear the IPv4 ID mangling feature if the
3500 * IPv4 header has the potential to be fragmented.
3502 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
3503 struct iphdr *iph = skb->encapsulation ?
3504 inner_ip_hdr(skb) : ip_hdr(skb);
3506 if (!(iph->frag_off & htons(IP_DF)))
3507 features &= ~NETIF_F_TSO_MANGLEID;
3513 netdev_features_t netif_skb_features(struct sk_buff *skb)
3515 struct net_device *dev = skb->dev;
3516 netdev_features_t features = dev->features;
3518 if (skb_is_gso(skb))
3519 features = gso_features_check(skb, dev, features);
3521 /* If encapsulation offload request, verify we are testing
3522 * hardware encapsulation features instead of standard
3523 * features for the netdev
3525 if (skb->encapsulation)
3526 features &= dev->hw_enc_features;
3528 if (skb_vlan_tagged(skb))
3529 features = netdev_intersect_features(features,
3530 dev->vlan_features |
3531 NETIF_F_HW_VLAN_CTAG_TX |
3532 NETIF_F_HW_VLAN_STAG_TX);
3534 if (dev->netdev_ops->ndo_features_check)
3535 features &= dev->netdev_ops->ndo_features_check(skb, dev,
3538 features &= dflt_features_check(skb, dev, features);
3540 return harmonize_features(skb, features);
3542 EXPORT_SYMBOL(netif_skb_features);
3544 static int xmit_one(struct sk_buff *skb, struct net_device *dev,
3545 struct netdev_queue *txq, bool more)
3550 if (dev_nit_active(dev))
3551 dev_queue_xmit_nit(skb, dev);
3554 PRANDOM_ADD_NOISE(skb, dev, txq, len + jiffies);
3555 trace_net_dev_start_xmit(skb, dev);
3556 rc = netdev_start_xmit(skb, dev, txq, more);
3557 trace_net_dev_xmit(skb, rc, dev, len);
3562 struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev,
3563 struct netdev_queue *txq, int *ret)
3565 struct sk_buff *skb = first;
3566 int rc = NETDEV_TX_OK;
3569 struct sk_buff *next = skb->next;
3571 skb_mark_not_on_list(skb);
3572 rc = xmit_one(skb, dev, txq, next != NULL);
3573 if (unlikely(!dev_xmit_complete(rc))) {
3579 if (netif_tx_queue_stopped(txq) && skb) {
3580 rc = NETDEV_TX_BUSY;
3590 static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb,
3591 netdev_features_t features)
3593 if (skb_vlan_tag_present(skb) &&
3594 !vlan_hw_offload_capable(features, skb->vlan_proto))
3595 skb = __vlan_hwaccel_push_inside(skb);
3599 int skb_csum_hwoffload_help(struct sk_buff *skb,
3600 const netdev_features_t features)
3602 if (unlikely(skb->csum_not_inet))
3603 return !!(features & NETIF_F_SCTP_CRC) ? 0 :
3604 skb_crc32c_csum_help(skb);
3606 return !!(features & NETIF_F_CSUM_MASK) ? 0 : skb_checksum_help(skb);
3608 EXPORT_SYMBOL(skb_csum_hwoffload_help);
3610 static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev, bool *again)
3612 netdev_features_t features;
3614 features = netif_skb_features(skb);
3615 skb = validate_xmit_vlan(skb, features);
3619 skb = sk_validate_xmit_skb(skb, dev);
3623 if (netif_needs_gso(skb, features)) {
3624 struct sk_buff *segs;
3626 segs = skb_gso_segment(skb, features);
3634 if (skb_needs_linearize(skb, features) &&
3635 __skb_linearize(skb))
3638 /* If packet is not checksummed and device does not
3639 * support checksumming for this protocol, complete
3640 * checksumming here.
3642 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3643 if (skb->encapsulation)
3644 skb_set_inner_transport_header(skb,
3645 skb_checksum_start_offset(skb));
3647 skb_set_transport_header(skb,
3648 skb_checksum_start_offset(skb));
3649 if (skb_csum_hwoffload_help(skb, features))
3654 skb = validate_xmit_xfrm(skb, features, again);
3661 atomic_long_inc(&dev->tx_dropped);
3665 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again)
3667 struct sk_buff *next, *head = NULL, *tail;
3669 for (; skb != NULL; skb = next) {
3671 skb_mark_not_on_list(skb);
3673 /* in case skb wont be segmented, point to itself */
3676 skb = validate_xmit_skb(skb, dev, again);
3684 /* If skb was segmented, skb->prev points to
3685 * the last segment. If not, it still contains skb.
3691 EXPORT_SYMBOL_GPL(validate_xmit_skb_list);
3693 static void qdisc_pkt_len_init(struct sk_buff *skb)
3695 const struct skb_shared_info *shinfo = skb_shinfo(skb);
3697 qdisc_skb_cb(skb)->pkt_len = skb->len;
3699 /* To get more precise estimation of bytes sent on wire,
3700 * we add to pkt_len the headers size of all segments
3702 if (shinfo->gso_size && skb_transport_header_was_set(skb)) {
3703 unsigned int hdr_len;
3704 u16 gso_segs = shinfo->gso_segs;
3706 /* mac layer + network layer */
3707 hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
3709 /* + transport layer */
3710 if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) {
3711 const struct tcphdr *th;
3712 struct tcphdr _tcphdr;
3714 th = skb_header_pointer(skb, skb_transport_offset(skb),
3715 sizeof(_tcphdr), &_tcphdr);
3717 hdr_len += __tcp_hdrlen(th);
3719 struct udphdr _udphdr;
3721 if (skb_header_pointer(skb, skb_transport_offset(skb),
3722 sizeof(_udphdr), &_udphdr))
3723 hdr_len += sizeof(struct udphdr);
3726 if (shinfo->gso_type & SKB_GSO_DODGY)
3727 gso_segs = DIV_ROUND_UP(skb->len - hdr_len,
3730 qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len;
3734 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
3735 struct net_device *dev,
3736 struct netdev_queue *txq)
3738 spinlock_t *root_lock = qdisc_lock(q);
3739 struct sk_buff *to_free = NULL;
3743 qdisc_calculate_pkt_len(skb, q);
3745 if (q->flags & TCQ_F_NOLOCK) {
3746 rc = q->enqueue(skb, q, &to_free) & NET_XMIT_MASK;
3749 if (unlikely(to_free))
3750 kfree_skb_list(to_free);
3755 * Heuristic to force contended enqueues to serialize on a
3756 * separate lock before trying to get qdisc main lock.
3757 * This permits qdisc->running owner to get the lock more
3758 * often and dequeue packets faster.
3760 contended = qdisc_is_running(q);
3761 if (unlikely(contended))
3762 spin_lock(&q->busylock);
3764 spin_lock(root_lock);
3765 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
3766 __qdisc_drop(skb, &to_free);
3768 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
3769 qdisc_run_begin(q)) {
3771 * This is a work-conserving queue; there are no old skbs
3772 * waiting to be sent out; and the qdisc is not running -
3773 * xmit the skb directly.
3776 qdisc_bstats_update(q, skb);
3778 if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) {
3779 if (unlikely(contended)) {
3780 spin_unlock(&q->busylock);
3787 rc = NET_XMIT_SUCCESS;
3789 rc = q->enqueue(skb, q, &to_free) & NET_XMIT_MASK;
3790 if (qdisc_run_begin(q)) {
3791 if (unlikely(contended)) {
3792 spin_unlock(&q->busylock);
3799 spin_unlock(root_lock);
3800 if (unlikely(to_free))
3801 kfree_skb_list(to_free);
3802 if (unlikely(contended))
3803 spin_unlock(&q->busylock);
3807 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
3808 static void skb_update_prio(struct sk_buff *skb)
3810 const struct netprio_map *map;
3811 const struct sock *sk;
3812 unsigned int prioidx;
3816 map = rcu_dereference_bh(skb->dev->priomap);
3819 sk = skb_to_full_sk(skb);
3823 prioidx = sock_cgroup_prioidx(&sk->sk_cgrp_data);
3825 if (prioidx < map->priomap_len)
3826 skb->priority = map->priomap[prioidx];
3829 #define skb_update_prio(skb)
3833 * dev_loopback_xmit - loop back @skb
3834 * @net: network namespace this loopback is happening in
3835 * @sk: sk needed to be a netfilter okfn
3836 * @skb: buffer to transmit
3838 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)
3840 skb_reset_mac_header(skb);
3841 __skb_pull(skb, skb_network_offset(skb));
3842 skb->pkt_type = PACKET_LOOPBACK;
3843 skb->ip_summed = CHECKSUM_UNNECESSARY;
3844 WARN_ON(!skb_dst(skb));
3849 EXPORT_SYMBOL(dev_loopback_xmit);
3851 #ifdef CONFIG_NET_EGRESS
3852 static struct sk_buff *
3853 sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
3855 struct mini_Qdisc *miniq = rcu_dereference_bh(dev->miniq_egress);
3856 struct tcf_result cl_res;
3861 /* qdisc_skb_cb(skb)->pkt_len was already set by the caller. */
3862 qdisc_skb_cb(skb)->mru = 0;
3863 mini_qdisc_bstats_cpu_update(miniq, skb);
3865 switch (tcf_classify(skb, miniq->filter_list, &cl_res, false)) {
3867 case TC_ACT_RECLASSIFY:
3868 skb->tc_index = TC_H_MIN(cl_res.classid);
3871 mini_qdisc_qstats_cpu_drop(miniq);
3872 *ret = NET_XMIT_DROP;
3878 *ret = NET_XMIT_SUCCESS;
3881 case TC_ACT_REDIRECT:
3882 /* No need to push/pop skb's mac_header here on egress! */
3883 skb_do_redirect(skb);
3884 *ret = NET_XMIT_SUCCESS;
3892 #endif /* CONFIG_NET_EGRESS */
3895 static int __get_xps_queue_idx(struct net_device *dev, struct sk_buff *skb,
3896 struct xps_dev_maps *dev_maps, unsigned int tci)
3898 struct xps_map *map;
3899 int queue_index = -1;
3903 tci += netdev_get_prio_tc_map(dev, skb->priority);
3906 map = rcu_dereference(dev_maps->attr_map[tci]);
3909 queue_index = map->queues[0];
3911 queue_index = map->queues[reciprocal_scale(
3912 skb_get_hash(skb), map->len)];
3913 if (unlikely(queue_index >= dev->real_num_tx_queues))
3920 static int get_xps_queue(struct net_device *dev, struct net_device *sb_dev,
3921 struct sk_buff *skb)
3924 struct xps_dev_maps *dev_maps;
3925 struct sock *sk = skb->sk;
3926 int queue_index = -1;
3928 if (!static_key_false(&xps_needed))
3932 if (!static_key_false(&xps_rxqs_needed))
3935 dev_maps = rcu_dereference(sb_dev->xps_rxqs_map);
3937 int tci = sk_rx_queue_get(sk);
3939 if (tci >= 0 && tci < dev->num_rx_queues)
3940 queue_index = __get_xps_queue_idx(dev, skb, dev_maps,
3945 if (queue_index < 0) {
3946 dev_maps = rcu_dereference(sb_dev->xps_cpus_map);
3948 unsigned int tci = skb->sender_cpu - 1;
3950 queue_index = __get_xps_queue_idx(dev, skb, dev_maps,
3962 u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb,
3963 struct net_device *sb_dev)
3967 EXPORT_SYMBOL(dev_pick_tx_zero);
3969 u16 dev_pick_tx_cpu_id(struct net_device *dev, struct sk_buff *skb,
3970 struct net_device *sb_dev)
3972 return (u16)raw_smp_processor_id() % dev->real_num_tx_queues;
3974 EXPORT_SYMBOL(dev_pick_tx_cpu_id);
3976 u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb,
3977 struct net_device *sb_dev)
3979 struct sock *sk = skb->sk;
3980 int queue_index = sk_tx_queue_get(sk);
3982 sb_dev = sb_dev ? : dev;
3984 if (queue_index < 0 || skb->ooo_okay ||
3985 queue_index >= dev->real_num_tx_queues) {
3986 int new_index = get_xps_queue(dev, sb_dev, skb);
3989 new_index = skb_tx_hash(dev, sb_dev, skb);
3991 if (queue_index != new_index && sk &&
3993 rcu_access_pointer(sk->sk_dst_cache))
3994 sk_tx_queue_set(sk, new_index);
3996 queue_index = new_index;
4001 EXPORT_SYMBOL(netdev_pick_tx);
4003 struct netdev_queue *netdev_core_pick_tx(struct net_device *dev,
4004 struct sk_buff *skb,
4005 struct net_device *sb_dev)
4007 int queue_index = 0;
4010 u32 sender_cpu = skb->sender_cpu - 1;
4012 if (sender_cpu >= (u32)NR_CPUS)
4013 skb->sender_cpu = raw_smp_processor_id() + 1;
4016 if (dev->real_num_tx_queues != 1) {
4017 const struct net_device_ops *ops = dev->netdev_ops;
4019 if (ops->ndo_select_queue)
4020 queue_index = ops->ndo_select_queue(dev, skb, sb_dev);
4022 queue_index = netdev_pick_tx(dev, skb, sb_dev);
4024 queue_index = netdev_cap_txqueue(dev, queue_index);
4027 skb_set_queue_mapping(skb, queue_index);
4028 return netdev_get_tx_queue(dev, queue_index);
4032 * __dev_queue_xmit - transmit a buffer
4033 * @skb: buffer to transmit
4034 * @sb_dev: suboordinate device used for L2 forwarding offload
4036 * Queue a buffer for transmission to a network device. The caller must
4037 * have set the device and priority and built the buffer before calling
4038 * this function. The function can be called from an interrupt.
4040 * A negative errno code is returned on a failure. A success does not
4041 * guarantee the frame will be transmitted as it may be dropped due
4042 * to congestion or traffic shaping.
4044 * -----------------------------------------------------------------------------------
4045 * I notice this method can also return errors from the queue disciplines,
4046 * including NET_XMIT_DROP, which is a positive value. So, errors can also
4049 * Regardless of the return value, the skb is consumed, so it is currently
4050 * difficult to retry a send to this method. (You can bump the ref count
4051 * before sending to hold a reference for retry if you are careful.)
4053 * When calling this method, interrupts MUST be enabled. This is because
4054 * the BH enable code must have IRQs enabled so that it will not deadlock.
4057 static int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev)
4059 struct net_device *dev = skb->dev;
4060 struct netdev_queue *txq;
4065 skb_reset_mac_header(skb);
4067 if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP))
4068 __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED);
4070 /* Disable soft irqs for various locks below. Also
4071 * stops preemption for RCU.
4075 skb_update_prio(skb);
4077 qdisc_pkt_len_init(skb);
4078 #ifdef CONFIG_NET_CLS_ACT
4079 skb->tc_at_ingress = 0;
4080 # ifdef CONFIG_NET_EGRESS
4081 if (static_branch_unlikely(&egress_needed_key)) {
4082 skb = sch_handle_egress(skb, &rc, dev);
4088 /* If device/qdisc don't need skb->dst, release it right now while
4089 * its hot in this cpu cache.
4091 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
4096 txq = netdev_core_pick_tx(dev, skb, sb_dev);
4097 q = rcu_dereference_bh(txq->qdisc);
4099 trace_net_dev_queue(skb);
4101 rc = __dev_xmit_skb(skb, q, dev, txq);
4105 /* The device has no queue. Common case for software devices:
4106 * loopback, all the sorts of tunnels...
4108 * Really, it is unlikely that netif_tx_lock protection is necessary
4109 * here. (f.e. loopback and IP tunnels are clean ignoring statistics
4111 * However, it is possible, that they rely on protection
4114 * Check this and shot the lock. It is not prone from deadlocks.
4115 *Either shot noqueue qdisc, it is even simpler 8)
4117 if (dev->flags & IFF_UP) {
4118 int cpu = smp_processor_id(); /* ok because BHs are off */
4120 if (txq->xmit_lock_owner != cpu) {
4121 if (dev_xmit_recursion())
4122 goto recursion_alert;
4124 skb = validate_xmit_skb(skb, dev, &again);
4128 PRANDOM_ADD_NOISE(skb, dev, txq, jiffies);
4129 HARD_TX_LOCK(dev, txq, cpu);
4131 if (!netif_xmit_stopped(txq)) {
4132 dev_xmit_recursion_inc();
4133 skb = dev_hard_start_xmit(skb, dev, txq, &rc);
4134 dev_xmit_recursion_dec();
4135 if (dev_xmit_complete(rc)) {
4136 HARD_TX_UNLOCK(dev, txq);
4140 HARD_TX_UNLOCK(dev, txq);
4141 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
4144 /* Recursion is detected! It is possible,
4148 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
4154 rcu_read_unlock_bh();
4156 atomic_long_inc(&dev->tx_dropped);
4157 kfree_skb_list(skb);
4160 rcu_read_unlock_bh();
4164 int dev_queue_xmit(struct sk_buff *skb)
4166 return __dev_queue_xmit(skb, NULL);
4168 EXPORT_SYMBOL(dev_queue_xmit);
4170 int dev_queue_xmit_accel(struct sk_buff *skb, struct net_device *sb_dev)
4172 return __dev_queue_xmit(skb, sb_dev);
4174 EXPORT_SYMBOL(dev_queue_xmit_accel);
4176 int __dev_direct_xmit(struct sk_buff *skb, u16 queue_id)
4178 struct net_device *dev = skb->dev;
4179 struct sk_buff *orig_skb = skb;
4180 struct netdev_queue *txq;
4181 int ret = NETDEV_TX_BUSY;
4184 if (unlikely(!netif_running(dev) ||
4185 !netif_carrier_ok(dev)))
4188 skb = validate_xmit_skb_list(skb, dev, &again);
4189 if (skb != orig_skb)
4192 skb_set_queue_mapping(skb, queue_id);
4193 txq = skb_get_tx_queue(dev, skb);
4194 PRANDOM_ADD_NOISE(skb, dev, txq, jiffies);
4198 dev_xmit_recursion_inc();
4199 HARD_TX_LOCK(dev, txq, smp_processor_id());
4200 if (!netif_xmit_frozen_or_drv_stopped(txq))
4201 ret = netdev_start_xmit(skb, dev, txq, false);
4202 HARD_TX_UNLOCK(dev, txq);
4203 dev_xmit_recursion_dec();
4208 atomic_long_inc(&dev->tx_dropped);
4209 kfree_skb_list(skb);
4210 return NET_XMIT_DROP;
4212 EXPORT_SYMBOL(__dev_direct_xmit);
4214 /*************************************************************************
4216 *************************************************************************/
4218 int netdev_max_backlog __read_mostly = 1000;
4219 EXPORT_SYMBOL(netdev_max_backlog);
4221 int netdev_tstamp_prequeue __read_mostly = 1;
4222 int netdev_budget __read_mostly = 300;
4223 /* Must be at least 2 jiffes to guarantee 1 jiffy timeout */
4224 unsigned int __read_mostly netdev_budget_usecs = 2 * USEC_PER_SEC / HZ;
4225 int weight_p __read_mostly = 64; /* old backlog weight */
4226 int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */
4227 int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */
4228 int dev_rx_weight __read_mostly = 64;
4229 int dev_tx_weight __read_mostly = 64;
4230 /* Maximum number of GRO_NORMAL skbs to batch up for list-RX */
4231 int gro_normal_batch __read_mostly = 8;
4233 /* Called with irq disabled */
4234 static inline void ____napi_schedule(struct softnet_data *sd,
4235 struct napi_struct *napi)
4237 list_add_tail(&napi->poll_list, &sd->poll_list);
4238 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
4243 /* One global table that all flow-based protocols share. */
4244 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
4245 EXPORT_SYMBOL(rps_sock_flow_table);
4246 u32 rps_cpu_mask __read_mostly;
4247 EXPORT_SYMBOL(rps_cpu_mask);
4249 struct static_key_false rps_needed __read_mostly;
4250 EXPORT_SYMBOL(rps_needed);
4251 struct static_key_false rfs_needed __read_mostly;
4252 EXPORT_SYMBOL(rfs_needed);
4254 static struct rps_dev_flow *
4255 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
4256 struct rps_dev_flow *rflow, u16 next_cpu)
4258 if (next_cpu < nr_cpu_ids) {
4259 #ifdef CONFIG_RFS_ACCEL
4260 struct netdev_rx_queue *rxqueue;
4261 struct rps_dev_flow_table *flow_table;
4262 struct rps_dev_flow *old_rflow;
4267 /* Should we steer this flow to a different hardware queue? */
4268 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
4269 !(dev->features & NETIF_F_NTUPLE))
4271 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
4272 if (rxq_index == skb_get_rx_queue(skb))
4275 rxqueue = dev->_rx + rxq_index;
4276 flow_table = rcu_dereference(rxqueue->rps_flow_table);
4279 flow_id = skb_get_hash(skb) & flow_table->mask;
4280 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
4281 rxq_index, flow_id);
4285 rflow = &flow_table->flows[flow_id];
4287 if (old_rflow->filter == rflow->filter)
4288 old_rflow->filter = RPS_NO_FILTER;
4292 per_cpu(softnet_data, next_cpu).input_queue_head;
4295 rflow->cpu = next_cpu;
4300 * get_rps_cpu is called from netif_receive_skb and returns the target
4301 * CPU from the RPS map of the receiving queue for a given skb.
4302 * rcu_read_lock must be held on entry.
4304 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
4305 struct rps_dev_flow **rflowp)
4307 const struct rps_sock_flow_table *sock_flow_table;
4308 struct netdev_rx_queue *rxqueue = dev->_rx;
4309 struct rps_dev_flow_table *flow_table;
4310 struct rps_map *map;
4315 if (skb_rx_queue_recorded(skb)) {
4316 u16 index = skb_get_rx_queue(skb);
4318 if (unlikely(index >= dev->real_num_rx_queues)) {
4319 WARN_ONCE(dev->real_num_rx_queues > 1,
4320 "%s received packet on queue %u, but number "
4321 "of RX queues is %u\n",
4322 dev->name, index, dev->real_num_rx_queues);
4328 /* Avoid computing hash if RFS/RPS is not active for this rxqueue */
4330 flow_table = rcu_dereference(rxqueue->rps_flow_table);
4331 map = rcu_dereference(rxqueue->rps_map);
4332 if (!flow_table && !map)
4335 skb_reset_network_header(skb);
4336 hash = skb_get_hash(skb);
4340 sock_flow_table = rcu_dereference(rps_sock_flow_table);
4341 if (flow_table && sock_flow_table) {
4342 struct rps_dev_flow *rflow;
4346 /* First check into global flow table if there is a match */
4347 ident = sock_flow_table->ents[hash & sock_flow_table->mask];
4348 if ((ident ^ hash) & ~rps_cpu_mask)
4351 next_cpu = ident & rps_cpu_mask;
4353 /* OK, now we know there is a match,
4354 * we can look at the local (per receive queue) flow table
4356 rflow = &flow_table->flows[hash & flow_table->mask];
4360 * If the desired CPU (where last recvmsg was done) is
4361 * different from current CPU (one in the rx-queue flow
4362 * table entry), switch if one of the following holds:
4363 * - Current CPU is unset (>= nr_cpu_ids).
4364 * - Current CPU is offline.
4365 * - The current CPU's queue tail has advanced beyond the
4366 * last packet that was enqueued using this table entry.
4367 * This guarantees that all previous packets for the flow
4368 * have been dequeued, thus preserving in order delivery.
4370 if (unlikely(tcpu != next_cpu) &&
4371 (tcpu >= nr_cpu_ids || !cpu_online(tcpu) ||
4372 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
4373 rflow->last_qtail)) >= 0)) {
4375 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
4378 if (tcpu < nr_cpu_ids && cpu_online(tcpu)) {
4388 tcpu = map->cpus[reciprocal_scale(hash, map->len)];
4389 if (cpu_online(tcpu)) {
4399 #ifdef CONFIG_RFS_ACCEL
4402 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
4403 * @dev: Device on which the filter was set
4404 * @rxq_index: RX queue index
4405 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
4406 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
4408 * Drivers that implement ndo_rx_flow_steer() should periodically call
4409 * this function for each installed filter and remove the filters for
4410 * which it returns %true.
4412 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
4413 u32 flow_id, u16 filter_id)
4415 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
4416 struct rps_dev_flow_table *flow_table;
4417 struct rps_dev_flow *rflow;
4422 flow_table = rcu_dereference(rxqueue->rps_flow_table);
4423 if (flow_table && flow_id <= flow_table->mask) {
4424 rflow = &flow_table->flows[flow_id];
4425 cpu = READ_ONCE(rflow->cpu);
4426 if (rflow->filter == filter_id && cpu < nr_cpu_ids &&
4427 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
4428 rflow->last_qtail) <
4429 (int)(10 * flow_table->mask)))
4435 EXPORT_SYMBOL(rps_may_expire_flow);
4437 #endif /* CONFIG_RFS_ACCEL */
4439 /* Called from hardirq (IPI) context */
4440 static void rps_trigger_softirq(void *data)
4442 struct softnet_data *sd = data;
4444 ____napi_schedule(sd, &sd->backlog);
4448 #endif /* CONFIG_RPS */
4451 * Check if this softnet_data structure is another cpu one
4452 * If yes, queue it to our IPI list and return 1
4455 static int rps_ipi_queued(struct softnet_data *sd)
4458 struct softnet_data *mysd = this_cpu_ptr(&softnet_data);
4461 sd->rps_ipi_next = mysd->rps_ipi_list;
4462 mysd->rps_ipi_list = sd;
4464 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
4467 #endif /* CONFIG_RPS */
4471 #ifdef CONFIG_NET_FLOW_LIMIT
4472 int netdev_flow_limit_table_len __read_mostly = (1 << 12);
4475 static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen)
4477 #ifdef CONFIG_NET_FLOW_LIMIT
4478 struct sd_flow_limit *fl;
4479 struct softnet_data *sd;
4480 unsigned int old_flow, new_flow;
4482 if (qlen < (netdev_max_backlog >> 1))
4485 sd = this_cpu_ptr(&softnet_data);
4488 fl = rcu_dereference(sd->flow_limit);
4490 new_flow = skb_get_hash(skb) & (fl->num_buckets - 1);
4491 old_flow = fl->history[fl->history_head];
4492 fl->history[fl->history_head] = new_flow;
4495 fl->history_head &= FLOW_LIMIT_HISTORY - 1;
4497 if (likely(fl->buckets[old_flow]))
4498 fl->buckets[old_flow]--;
4500 if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) {
4512 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
4513 * queue (may be a remote CPU queue).
4515 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
4516 unsigned int *qtail)
4518 struct softnet_data *sd;
4519 unsigned long flags;
4522 sd = &per_cpu(softnet_data, cpu);
4524 local_irq_save(flags);
4527 if (!netif_running(skb->dev))
4529 qlen = skb_queue_len(&sd->input_pkt_queue);
4530 if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) {
4533 __skb_queue_tail(&sd->input_pkt_queue, skb);
4534 input_queue_tail_incr_save(sd, qtail);
4536 local_irq_restore(flags);
4537 return NET_RX_SUCCESS;
4540 /* Schedule NAPI for backlog device
4541 * We can use non atomic operation since we own the queue lock
4543 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
4544 if (!rps_ipi_queued(sd))
4545 ____napi_schedule(sd, &sd->backlog);
4554 local_irq_restore(flags);
4556 atomic_long_inc(&skb->dev->rx_dropped);
4561 static struct netdev_rx_queue *netif_get_rxqueue(struct sk_buff *skb)
4563 struct net_device *dev = skb->dev;
4564 struct netdev_rx_queue *rxqueue;
4568 if (skb_rx_queue_recorded(skb)) {
4569 u16 index = skb_get_rx_queue(skb);
4571 if (unlikely(index >= dev->real_num_rx_queues)) {
4572 WARN_ONCE(dev->real_num_rx_queues > 1,
4573 "%s received packet on queue %u, but number "
4574 "of RX queues is %u\n",
4575 dev->name, index, dev->real_num_rx_queues);
4577 return rxqueue; /* Return first rxqueue */
4584 static u32 netif_receive_generic_xdp(struct sk_buff *skb,
4585 struct xdp_buff *xdp,
4586 struct bpf_prog *xdp_prog)
4588 struct netdev_rx_queue *rxqueue;
4589 void *orig_data, *orig_data_end;
4590 u32 metalen, act = XDP_DROP;
4591 __be16 orig_eth_type;
4597 /* Reinjected packets coming from act_mirred or similar should
4598 * not get XDP generic processing.
4600 if (skb_is_redirected(skb))
4603 /* XDP packets must be linear and must have sufficient headroom
4604 * of XDP_PACKET_HEADROOM bytes. This is the guarantee that also
4605 * native XDP provides, thus we need to do it here as well.
4607 if (skb_cloned(skb) || skb_is_nonlinear(skb) ||
4608 skb_headroom(skb) < XDP_PACKET_HEADROOM) {
4609 int hroom = XDP_PACKET_HEADROOM - skb_headroom(skb);
4610 int troom = skb->tail + skb->data_len - skb->end;
4612 /* In case we have to go down the path and also linearize,
4613 * then lets do the pskb_expand_head() work just once here.
4615 if (pskb_expand_head(skb,
4616 hroom > 0 ? ALIGN(hroom, NET_SKB_PAD) : 0,
4617 troom > 0 ? troom + 128 : 0, GFP_ATOMIC))
4619 if (skb_linearize(skb))
4623 /* The XDP program wants to see the packet starting at the MAC
4626 mac_len = skb->data - skb_mac_header(skb);
4627 hlen = skb_headlen(skb) + mac_len;
4628 xdp->data = skb->data - mac_len;
4629 xdp->data_meta = xdp->data;
4630 xdp->data_end = xdp->data + hlen;
4631 xdp->data_hard_start = skb->data - skb_headroom(skb);
4633 /* SKB "head" area always have tailroom for skb_shared_info */
4634 xdp->frame_sz = (void *)skb_end_pointer(skb) - xdp->data_hard_start;
4635 xdp->frame_sz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
4637 orig_data_end = xdp->data_end;
4638 orig_data = xdp->data;
4639 eth = (struct ethhdr *)xdp->data;
4640 orig_bcast = is_multicast_ether_addr_64bits(eth->h_dest);
4641 orig_eth_type = eth->h_proto;
4643 rxqueue = netif_get_rxqueue(skb);
4644 xdp->rxq = &rxqueue->xdp_rxq;
4646 act = bpf_prog_run_xdp(xdp_prog, xdp);
4648 /* check if bpf_xdp_adjust_head was used */
4649 off = xdp->data - orig_data;
4652 __skb_pull(skb, off);
4654 __skb_push(skb, -off);
4656 skb->mac_header += off;
4657 skb_reset_network_header(skb);
4660 /* check if bpf_xdp_adjust_tail was used */
4661 off = xdp->data_end - orig_data_end;
4663 skb_set_tail_pointer(skb, xdp->data_end - xdp->data);
4664 skb->len += off; /* positive on grow, negative on shrink */
4667 /* check if XDP changed eth hdr such SKB needs update */
4668 eth = (struct ethhdr *)xdp->data;
4669 if ((orig_eth_type != eth->h_proto) ||
4670 (orig_bcast != is_multicast_ether_addr_64bits(eth->h_dest))) {
4671 __skb_push(skb, ETH_HLEN);
4672 skb->protocol = eth_type_trans(skb, skb->dev);
4678 __skb_push(skb, mac_len);
4681 metalen = xdp->data - xdp->data_meta;
4683 skb_metadata_set(skb, metalen);
4686 bpf_warn_invalid_xdp_action(act);
4689 trace_xdp_exception(skb->dev, xdp_prog, act);
4700 /* When doing generic XDP we have to bypass the qdisc layer and the
4701 * network taps in order to match in-driver-XDP behavior.
4703 void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog)
4705 struct net_device *dev = skb->dev;
4706 struct netdev_queue *txq;
4707 bool free_skb = true;
4710 txq = netdev_core_pick_tx(dev, skb, NULL);
4711 cpu = smp_processor_id();
4712 HARD_TX_LOCK(dev, txq, cpu);
4713 if (!netif_xmit_stopped(txq)) {
4714 rc = netdev_start_xmit(skb, dev, txq, 0);
4715 if (dev_xmit_complete(rc))
4718 HARD_TX_UNLOCK(dev, txq);
4720 trace_xdp_exception(dev, xdp_prog, XDP_TX);
4725 static DEFINE_STATIC_KEY_FALSE(generic_xdp_needed_key);
4727 int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb)
4730 struct xdp_buff xdp;
4734 act = netif_receive_generic_xdp(skb, &xdp, xdp_prog);
4735 if (act != XDP_PASS) {
4738 err = xdp_do_generic_redirect(skb->dev, skb,
4744 generic_xdp_tx(skb, xdp_prog);
4755 EXPORT_SYMBOL_GPL(do_xdp_generic);
4757 static int netif_rx_internal(struct sk_buff *skb)
4761 net_timestamp_check(netdev_tstamp_prequeue, skb);
4763 trace_netif_rx(skb);
4766 if (static_branch_unlikely(&rps_needed)) {
4767 struct rps_dev_flow voidflow, *rflow = &voidflow;
4773 cpu = get_rps_cpu(skb->dev, skb, &rflow);
4775 cpu = smp_processor_id();
4777 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
4786 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
4793 * netif_rx - post buffer to the network code
4794 * @skb: buffer to post
4796 * This function receives a packet from a device driver and queues it for
4797 * the upper (protocol) levels to process. It always succeeds. The buffer
4798 * may be dropped during processing for congestion control or by the
4802 * NET_RX_SUCCESS (no congestion)
4803 * NET_RX_DROP (packet was dropped)
4807 int netif_rx(struct sk_buff *skb)
4811 trace_netif_rx_entry(skb);
4813 ret = netif_rx_internal(skb);
4814 trace_netif_rx_exit(ret);
4818 EXPORT_SYMBOL(netif_rx);
4820 int netif_rx_ni(struct sk_buff *skb)
4824 trace_netif_rx_ni_entry(skb);
4827 err = netif_rx_internal(skb);
4828 if (local_softirq_pending())
4831 trace_netif_rx_ni_exit(err);
4835 EXPORT_SYMBOL(netif_rx_ni);
4837 int netif_rx_any_context(struct sk_buff *skb)
4840 * If invoked from contexts which do not invoke bottom half
4841 * processing either at return from interrupt or when softrqs are
4842 * reenabled, use netif_rx_ni() which invokes bottomhalf processing
4846 return netif_rx(skb);
4848 return netif_rx_ni(skb);
4850 EXPORT_SYMBOL(netif_rx_any_context);
4852 static __latent_entropy void net_tx_action(struct softirq_action *h)
4854 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
4856 if (sd->completion_queue) {
4857 struct sk_buff *clist;
4859 local_irq_disable();
4860 clist = sd->completion_queue;
4861 sd->completion_queue = NULL;
4865 struct sk_buff *skb = clist;
4867 clist = clist->next;
4869 WARN_ON(refcount_read(&skb->users));
4870 if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED))
4871 trace_consume_skb(skb);
4873 trace_kfree_skb(skb, net_tx_action);
4875 if (skb->fclone != SKB_FCLONE_UNAVAILABLE)
4878 __kfree_skb_defer(skb);
4881 __kfree_skb_flush();
4884 if (sd->output_queue) {
4887 local_irq_disable();
4888 head = sd->output_queue;
4889 sd->output_queue = NULL;
4890 sd->output_queue_tailp = &sd->output_queue;
4894 struct Qdisc *q = head;
4895 spinlock_t *root_lock = NULL;
4897 head = head->next_sched;
4899 if (!(q->flags & TCQ_F_NOLOCK)) {
4900 root_lock = qdisc_lock(q);
4901 spin_lock(root_lock);
4903 /* We need to make sure head->next_sched is read
4904 * before clearing __QDISC_STATE_SCHED
4906 smp_mb__before_atomic();
4907 clear_bit(__QDISC_STATE_SCHED, &q->state);
4910 spin_unlock(root_lock);
4914 xfrm_dev_backlog(sd);
4917 #if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_ATM_LANE)
4918 /* This hook is defined here for ATM LANE */
4919 int (*br_fdb_test_addr_hook)(struct net_device *dev,
4920 unsigned char *addr) __read_mostly;
4921 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
4924 static inline struct sk_buff *
4925 sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret,
4926 struct net_device *orig_dev, bool *another)
4928 #ifdef CONFIG_NET_CLS_ACT
4929 struct mini_Qdisc *miniq = rcu_dereference_bh(skb->dev->miniq_ingress);
4930 struct tcf_result cl_res;
4932 /* If there's at least one ingress present somewhere (so
4933 * we get here via enabled static key), remaining devices
4934 * that are not configured with an ingress qdisc will bail
4941 *ret = deliver_skb(skb, *pt_prev, orig_dev);
4945 qdisc_skb_cb(skb)->pkt_len = skb->len;
4946 qdisc_skb_cb(skb)->mru = 0;
4947 skb->tc_at_ingress = 1;
4948 mini_qdisc_bstats_cpu_update(miniq, skb);
4950 switch (tcf_classify_ingress(skb, miniq->block, miniq->filter_list,
4953 case TC_ACT_RECLASSIFY:
4954 skb->tc_index = TC_H_MIN(cl_res.classid);
4957 mini_qdisc_qstats_cpu_drop(miniq);
4965 case TC_ACT_REDIRECT:
4966 /* skb_mac_header check was done by cls/act_bpf, so
4967 * we can safely push the L2 header back before
4968 * redirecting to another netdev
4970 __skb_push(skb, skb->mac_len);
4971 if (skb_do_redirect(skb) == -EAGAIN) {
4972 __skb_pull(skb, skb->mac_len);
4977 case TC_ACT_CONSUMED:
4982 #endif /* CONFIG_NET_CLS_ACT */
4987 * netdev_is_rx_handler_busy - check if receive handler is registered
4988 * @dev: device to check
4990 * Check if a receive handler is already registered for a given device.
4991 * Return true if there one.
4993 * The caller must hold the rtnl_mutex.
4995 bool netdev_is_rx_handler_busy(struct net_device *dev)
4998 return dev && rtnl_dereference(dev->rx_handler);
5000 EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy);
5003 * netdev_rx_handler_register - register receive handler
5004 * @dev: device to register a handler for
5005 * @rx_handler: receive handler to register
5006 * @rx_handler_data: data pointer that is used by rx handler
5008 * Register a receive handler for a device. This handler will then be
5009 * called from __netif_receive_skb. A negative errno code is returned
5012 * The caller must hold the rtnl_mutex.
5014 * For a general description of rx_handler, see enum rx_handler_result.
5016 int netdev_rx_handler_register(struct net_device *dev,
5017 rx_handler_func_t *rx_handler,
5018 void *rx_handler_data)
5020 if (netdev_is_rx_handler_busy(dev))
5023 if (dev->priv_flags & IFF_NO_RX_HANDLER)
5026 /* Note: rx_handler_data must be set before rx_handler */
5027 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
5028 rcu_assign_pointer(dev->rx_handler, rx_handler);
5032 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
5035 * netdev_rx_handler_unregister - unregister receive handler
5036 * @dev: device to unregister a handler from
5038 * Unregister a receive handler from a device.
5040 * The caller must hold the rtnl_mutex.
5042 void netdev_rx_handler_unregister(struct net_device *dev)
5046 RCU_INIT_POINTER(dev->rx_handler, NULL);
5047 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
5048 * section has a guarantee to see a non NULL rx_handler_data
5052 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
5054 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
5057 * Limit the use of PFMEMALLOC reserves to those protocols that implement
5058 * the special handling of PFMEMALLOC skbs.
5060 static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
5062 switch (skb->protocol) {
5063 case htons(ETH_P_ARP):
5064 case htons(ETH_P_IP):
5065 case htons(ETH_P_IPV6):
5066 case htons(ETH_P_8021Q):
5067 case htons(ETH_P_8021AD):
5074 static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
5075 int *ret, struct net_device *orig_dev)
5077 if (nf_hook_ingress_active(skb)) {
5081 *ret = deliver_skb(skb, *pt_prev, orig_dev);
5086 ingress_retval = nf_hook_ingress(skb);
5088 return ingress_retval;
5093 static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc,
5094 struct packet_type **ppt_prev)
5096 struct packet_type *ptype, *pt_prev;
5097 rx_handler_func_t *rx_handler;
5098 struct sk_buff *skb = *pskb;
5099 struct net_device *orig_dev;
5100 bool deliver_exact = false;
5101 int ret = NET_RX_DROP;
5104 net_timestamp_check(!netdev_tstamp_prequeue, skb);
5106 trace_netif_receive_skb(skb);
5108 orig_dev = skb->dev;
5110 skb_reset_network_header(skb);
5111 if (!skb_transport_header_was_set(skb))
5112 skb_reset_transport_header(skb);
5113 skb_reset_mac_len(skb);
5118 skb->skb_iif = skb->dev->ifindex;
5120 __this_cpu_inc(softnet_data.processed);
5122 if (static_branch_unlikely(&generic_xdp_needed_key)) {
5126 ret2 = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), skb);
5129 if (ret2 != XDP_PASS) {
5133 skb_reset_mac_len(skb);
5136 if (skb->protocol == cpu_to_be16(ETH_P_8021Q) ||
5137 skb->protocol == cpu_to_be16(ETH_P_8021AD)) {
5138 skb = skb_vlan_untag(skb);
5143 if (skb_skip_tc_classify(skb))
5149 list_for_each_entry_rcu(ptype, &ptype_all, list) {
5151 ret = deliver_skb(skb, pt_prev, orig_dev);
5155 list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) {
5157 ret = deliver_skb(skb, pt_prev, orig_dev);
5162 #ifdef CONFIG_NET_INGRESS
5163 if (static_branch_unlikely(&ingress_needed_key)) {
5164 bool another = false;
5166 skb = sch_handle_ingress(skb, &pt_prev, &ret, orig_dev,
5173 if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0)
5177 skb_reset_redirect(skb);
5179 if (pfmemalloc && !skb_pfmemalloc_protocol(skb))
5182 if (skb_vlan_tag_present(skb)) {
5184 ret = deliver_skb(skb, pt_prev, orig_dev);
5187 if (vlan_do_receive(&skb))
5189 else if (unlikely(!skb))
5193 rx_handler = rcu_dereference(skb->dev->rx_handler);
5196 ret = deliver_skb(skb, pt_prev, orig_dev);
5199 switch (rx_handler(&skb)) {
5200 case RX_HANDLER_CONSUMED:
5201 ret = NET_RX_SUCCESS;
5203 case RX_HANDLER_ANOTHER:
5205 case RX_HANDLER_EXACT:
5206 deliver_exact = true;
5207 case RX_HANDLER_PASS:
5214 if (unlikely(skb_vlan_tag_present(skb)) && !netdev_uses_dsa(skb->dev)) {
5216 if (skb_vlan_tag_get_id(skb)) {
5217 /* Vlan id is non 0 and vlan_do_receive() above couldn't
5220 skb->pkt_type = PACKET_OTHERHOST;
5221 } else if (skb->protocol == cpu_to_be16(ETH_P_8021Q) ||
5222 skb->protocol == cpu_to_be16(ETH_P_8021AD)) {
5223 /* Outer header is 802.1P with vlan 0, inner header is
5224 * 802.1Q or 802.1AD and vlan_do_receive() above could
5225 * not find vlan dev for vlan id 0.
5227 __vlan_hwaccel_clear_tag(skb);
5228 skb = skb_vlan_untag(skb);
5231 if (vlan_do_receive(&skb))
5232 /* After stripping off 802.1P header with vlan 0
5233 * vlan dev is found for inner header.
5236 else if (unlikely(!skb))
5239 /* We have stripped outer 802.1P vlan 0 header.
5240 * But could not find vlan dev.
5241 * check again for vlan id to set OTHERHOST.
5245 /* Note: we might in the future use prio bits
5246 * and set skb->priority like in vlan_do_receive()
5247 * For the time being, just ignore Priority Code Point
5249 __vlan_hwaccel_clear_tag(skb);
5252 type = skb->protocol;
5254 /* deliver only exact match when indicated */
5255 if (likely(!deliver_exact)) {
5256 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
5257 &ptype_base[ntohs(type) &
5261 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
5262 &orig_dev->ptype_specific);
5264 if (unlikely(skb->dev != orig_dev)) {
5265 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
5266 &skb->dev->ptype_specific);
5270 if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC)))
5272 *ppt_prev = pt_prev;
5276 atomic_long_inc(&skb->dev->rx_dropped);
5278 atomic_long_inc(&skb->dev->rx_nohandler);
5280 /* Jamal, now you will not able to escape explaining
5281 * me how you were going to use this. :-)
5287 /* The invariant here is that if *ppt_prev is not NULL
5288 * then skb should also be non-NULL.
5290 * Apparently *ppt_prev assignment above holds this invariant due to
5291 * skb dereferencing near it.
5297 static int __netif_receive_skb_one_core(struct sk_buff *skb, bool pfmemalloc)
5299 struct net_device *orig_dev = skb->dev;
5300 struct packet_type *pt_prev = NULL;
5303 ret = __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev);
5305 ret = INDIRECT_CALL_INET(pt_prev->func, ipv6_rcv, ip_rcv, skb,
5306 skb->dev, pt_prev, orig_dev);
5311 * netif_receive_skb_core - special purpose version of netif_receive_skb
5312 * @skb: buffer to process
5314 * More direct receive version of netif_receive_skb(). It should
5315 * only be used by callers that have a need to skip RPS and Generic XDP.
5316 * Caller must also take care of handling if ``(page_is_)pfmemalloc``.
5318 * This function may only be called from softirq context and interrupts
5319 * should be enabled.
5321 * Return values (usually ignored):
5322 * NET_RX_SUCCESS: no congestion
5323 * NET_RX_DROP: packet was dropped
5325 int netif_receive_skb_core(struct sk_buff *skb)
5330 ret = __netif_receive_skb_one_core(skb, false);
5335 EXPORT_SYMBOL(netif_receive_skb_core);
5337 static inline void __netif_receive_skb_list_ptype(struct list_head *head,
5338 struct packet_type *pt_prev,
5339 struct net_device *orig_dev)
5341 struct sk_buff *skb, *next;
5345 if (list_empty(head))
5347 if (pt_prev->list_func != NULL)
5348 INDIRECT_CALL_INET(pt_prev->list_func, ipv6_list_rcv,
5349 ip_list_rcv, head, pt_prev, orig_dev);
5351 list_for_each_entry_safe(skb, next, head, list) {
5352 skb_list_del_init(skb);
5353 pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
5357 static void __netif_receive_skb_list_core(struct list_head *head, bool pfmemalloc)
5359 /* Fast-path assumptions:
5360 * - There is no RX handler.
5361 * - Only one packet_type matches.
5362 * If either of these fails, we will end up doing some per-packet
5363 * processing in-line, then handling the 'last ptype' for the whole
5364 * sublist. This can't cause out-of-order delivery to any single ptype,
5365 * because the 'last ptype' must be constant across the sublist, and all
5366 * other ptypes are handled per-packet.
5368 /* Current (common) ptype of sublist */
5369 struct packet_type *pt_curr = NULL;
5370 /* Current (common) orig_dev of sublist */
5371 struct net_device *od_curr = NULL;
5372 struct list_head sublist;
5373 struct sk_buff *skb, *next;
5375 INIT_LIST_HEAD(&sublist);
5376 list_for_each_entry_safe(skb, next, head, list) {
5377 struct net_device *orig_dev = skb->dev;
5378 struct packet_type *pt_prev = NULL;
5380 skb_list_del_init(skb);
5381 __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev);
5384 if (pt_curr != pt_prev || od_curr != orig_dev) {
5385 /* dispatch old sublist */
5386 __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr);
5387 /* start new sublist */
5388 INIT_LIST_HEAD(&sublist);
5392 list_add_tail(&skb->list, &sublist);
5395 /* dispatch final sublist */
5396 __netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr);
5399 static int __netif_receive_skb(struct sk_buff *skb)
5403 if (sk_memalloc_socks() && skb_pfmemalloc(skb)) {
5404 unsigned int noreclaim_flag;
5407 * PFMEMALLOC skbs are special, they should
5408 * - be delivered to SOCK_MEMALLOC sockets only
5409 * - stay away from userspace
5410 * - have bounded memory usage
5412 * Use PF_MEMALLOC as this saves us from propagating the allocation
5413 * context down to all allocation sites.
5415 noreclaim_flag = memalloc_noreclaim_save();
5416 ret = __netif_receive_skb_one_core(skb, true);
5417 memalloc_noreclaim_restore(noreclaim_flag);
5419 ret = __netif_receive_skb_one_core(skb, false);
5424 static void __netif_receive_skb_list(struct list_head *head)
5426 unsigned long noreclaim_flag = 0;
5427 struct sk_buff *skb, *next;
5428 bool pfmemalloc = false; /* Is current sublist PF_MEMALLOC? */
5430 list_for_each_entry_safe(skb, next, head, list) {
5431 if ((sk_memalloc_socks() && skb_pfmemalloc(skb)) != pfmemalloc) {
5432 struct list_head sublist;
5434 /* Handle the previous sublist */
5435 list_cut_before(&sublist, head, &skb->list);
5436 if (!list_empty(&sublist))
5437 __netif_receive_skb_list_core(&sublist, pfmemalloc);
5438 pfmemalloc = !pfmemalloc;
5439 /* See comments in __netif_receive_skb */
5441 noreclaim_flag = memalloc_noreclaim_save();
5443 memalloc_noreclaim_restore(noreclaim_flag);
5446 /* Handle the remaining sublist */
5447 if (!list_empty(head))
5448 __netif_receive_skb_list_core(head, pfmemalloc);
5449 /* Restore pflags */
5451 memalloc_noreclaim_restore(noreclaim_flag);
5454 static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp)
5456 struct bpf_prog *old = rtnl_dereference(dev->xdp_prog);
5457 struct bpf_prog *new = xdp->prog;
5463 mutex_lock(&new->aux->used_maps_mutex);
5465 /* generic XDP does not work with DEVMAPs that can
5466 * have a bpf_prog installed on an entry
5468 for (i = 0; i < new->aux->used_map_cnt; i++) {
5469 if (dev_map_can_have_prog(new->aux->used_maps[i]) ||
5470 cpu_map_prog_allowed(new->aux->used_maps[i])) {
5471 mutex_unlock(&new->aux->used_maps_mutex);
5476 mutex_unlock(&new->aux->used_maps_mutex);
5479 switch (xdp->command) {
5480 case XDP_SETUP_PROG:
5481 rcu_assign_pointer(dev->xdp_prog, new);
5486 static_branch_dec(&generic_xdp_needed_key);
5487 } else if (new && !old) {
5488 static_branch_inc(&generic_xdp_needed_key);
5489 dev_disable_lro(dev);
5490 dev_disable_gro_hw(dev);
5502 static int netif_receive_skb_internal(struct sk_buff *skb)
5506 net_timestamp_check(netdev_tstamp_prequeue, skb);
5508 if (skb_defer_rx_timestamp(skb))
5509 return NET_RX_SUCCESS;
5513 if (static_branch_unlikely(&rps_needed)) {
5514 struct rps_dev_flow voidflow, *rflow = &voidflow;
5515 int cpu = get_rps_cpu(skb->dev, skb, &rflow);
5518 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
5524 ret = __netif_receive_skb(skb);
5529 static void netif_receive_skb_list_internal(struct list_head *head)
5531 struct sk_buff *skb, *next;
5532 struct list_head sublist;
5534 INIT_LIST_HEAD(&sublist);
5535 list_for_each_entry_safe(skb, next, head, list) {
5536 net_timestamp_check(netdev_tstamp_prequeue, skb);
5537 skb_list_del_init(skb);
5538 if (!skb_defer_rx_timestamp(skb))
5539 list_add_tail(&skb->list, &sublist);
5541 list_splice_init(&sublist, head);
5545 if (static_branch_unlikely(&rps_needed)) {
5546 list_for_each_entry_safe(skb, next, head, list) {
5547 struct rps_dev_flow voidflow, *rflow = &voidflow;
5548 int cpu = get_rps_cpu(skb->dev, skb, &rflow);
5551 /* Will be handled, remove from list */
5552 skb_list_del_init(skb);
5553 enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
5558 __netif_receive_skb_list(head);
5563 * netif_receive_skb - process receive buffer from network
5564 * @skb: buffer to process
5566 * netif_receive_skb() is the main receive data processing function.
5567 * It always succeeds. The buffer may be dropped during processing
5568 * for congestion control or by the protocol layers.
5570 * This function may only be called from softirq context and interrupts
5571 * should be enabled.
5573 * Return values (usually ignored):
5574 * NET_RX_SUCCESS: no congestion
5575 * NET_RX_DROP: packet was dropped
5577 int netif_receive_skb(struct sk_buff *skb)
5581 trace_netif_receive_skb_entry(skb);
5583 ret = netif_receive_skb_internal(skb);
5584 trace_netif_receive_skb_exit(ret);
5588 EXPORT_SYMBOL(netif_receive_skb);
5591 * netif_receive_skb_list - process many receive buffers from network
5592 * @head: list of skbs to process.
5594 * Since return value of netif_receive_skb() is normally ignored, and
5595 * wouldn't be meaningful for a list, this function returns void.
5597 * This function may only be called from softirq context and interrupts
5598 * should be enabled.
5600 void netif_receive_skb_list(struct list_head *head)
5602 struct sk_buff *skb;
5604 if (list_empty(head))
5606 if (trace_netif_receive_skb_list_entry_enabled()) {
5607 list_for_each_entry(skb, head, list)
5608 trace_netif_receive_skb_list_entry(skb);
5610 netif_receive_skb_list_internal(head);
5611 trace_netif_receive_skb_list_exit(0);
5613 EXPORT_SYMBOL(netif_receive_skb_list);
5615 static DEFINE_PER_CPU(struct work_struct, flush_works);
5617 /* Network device is going away, flush any packets still pending */
5618 static void flush_backlog(struct work_struct *work)
5620 struct sk_buff *skb, *tmp;
5621 struct softnet_data *sd;
5624 sd = this_cpu_ptr(&softnet_data);
5626 local_irq_disable();
5628 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
5629 if (skb->dev->reg_state == NETREG_UNREGISTERING) {
5630 __skb_unlink(skb, &sd->input_pkt_queue);
5631 dev_kfree_skb_irq(skb);
5632 input_queue_head_incr(sd);
5638 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
5639 if (skb->dev->reg_state == NETREG_UNREGISTERING) {
5640 __skb_unlink(skb, &sd->process_queue);
5642 input_queue_head_incr(sd);
5648 static bool flush_required(int cpu)
5650 #if IS_ENABLED(CONFIG_RPS)
5651 struct softnet_data *sd = &per_cpu(softnet_data, cpu);
5654 local_irq_disable();
5657 /* as insertion into process_queue happens with the rps lock held,
5658 * process_queue access may race only with dequeue
5660 do_flush = !skb_queue_empty(&sd->input_pkt_queue) ||
5661 !skb_queue_empty_lockless(&sd->process_queue);
5667 /* without RPS we can't safely check input_pkt_queue: during a
5668 * concurrent remote skb_queue_splice() we can detect as empty both
5669 * input_pkt_queue and process_queue even if the latter could end-up
5670 * containing a lot of packets.
5675 static void flush_all_backlogs(void)
5677 static cpumask_t flush_cpus;
5680 /* since we are under rtnl lock protection we can use static data
5681 * for the cpumask and avoid allocating on stack the possibly
5688 cpumask_clear(&flush_cpus);
5689 for_each_online_cpu(cpu) {
5690 if (flush_required(cpu)) {
5691 queue_work_on(cpu, system_highpri_wq,
5692 per_cpu_ptr(&flush_works, cpu));
5693 cpumask_set_cpu(cpu, &flush_cpus);
5697 /* we can have in flight packet[s] on the cpus we are not flushing,
5698 * synchronize_net() in rollback_registered_many() will take care of
5701 for_each_cpu(cpu, &flush_cpus)
5702 flush_work(per_cpu_ptr(&flush_works, cpu));
5707 /* Pass the currently batched GRO_NORMAL SKBs up to the stack. */
5708 static void gro_normal_list(struct napi_struct *napi)
5710 if (!napi->rx_count)
5712 netif_receive_skb_list_internal(&napi->rx_list);
5713 INIT_LIST_HEAD(&napi->rx_list);
5717 /* Queue one GRO_NORMAL SKB up for list processing. If batch size exceeded,
5718 * pass the whole batch up to the stack.
5720 static void gro_normal_one(struct napi_struct *napi, struct sk_buff *skb)
5722 list_add_tail(&skb->list, &napi->rx_list);
5723 if (++napi->rx_count >= gro_normal_batch)
5724 gro_normal_list(napi);
5727 INDIRECT_CALLABLE_DECLARE(int inet_gro_complete(struct sk_buff *, int));
5728 INDIRECT_CALLABLE_DECLARE(int ipv6_gro_complete(struct sk_buff *, int));
5729 static int napi_gro_complete(struct napi_struct *napi, struct sk_buff *skb)
5731 struct packet_offload *ptype;
5732 __be16 type = skb->protocol;
5733 struct list_head *head = &offload_base;
5736 BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb));
5738 if (NAPI_GRO_CB(skb)->count == 1) {
5739 skb_shinfo(skb)->gso_size = 0;
5744 list_for_each_entry_rcu(ptype, head, list) {
5745 if (ptype->type != type || !ptype->callbacks.gro_complete)
5748 err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
5749 ipv6_gro_complete, inet_gro_complete,
5756 WARN_ON(&ptype->list == head);
5758 return NET_RX_SUCCESS;
5762 gro_normal_one(napi, skb);
5763 return NET_RX_SUCCESS;
5766 static void __napi_gro_flush_chain(struct napi_struct *napi, u32 index,
5769 struct list_head *head = &napi->gro_hash[index].list;
5770 struct sk_buff *skb, *p;
5772 list_for_each_entry_safe_reverse(skb, p, head, list) {
5773 if (flush_old && NAPI_GRO_CB(skb)->age == jiffies)
5775 skb_list_del_init(skb);
5776 napi_gro_complete(napi, skb);
5777 napi->gro_hash[index].count--;
5780 if (!napi->gro_hash[index].count)
5781 __clear_bit(index, &napi->gro_bitmask);
5784 /* napi->gro_hash[].list contains packets ordered by age.
5785 * youngest packets at the head of it.
5786 * Complete skbs in reverse order to reduce latencies.
5788 void napi_gro_flush(struct napi_struct *napi, bool flush_old)
5790 unsigned long bitmask = napi->gro_bitmask;
5791 unsigned int i, base = ~0U;
5793 while ((i = ffs(bitmask)) != 0) {
5796 __napi_gro_flush_chain(napi, base, flush_old);
5799 EXPORT_SYMBOL(napi_gro_flush);
5801 static struct list_head *gro_list_prepare(struct napi_struct *napi,
5802 struct sk_buff *skb)
5804 unsigned int maclen = skb->dev->hard_header_len;
5805 u32 hash = skb_get_hash_raw(skb);
5806 struct list_head *head;
5809 head = &napi->gro_hash[hash & (GRO_HASH_BUCKETS - 1)].list;
5810 list_for_each_entry(p, head, list) {
5811 unsigned long diffs;
5813 NAPI_GRO_CB(p)->flush = 0;
5815 if (hash != skb_get_hash_raw(p)) {
5816 NAPI_GRO_CB(p)->same_flow = 0;
5820 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
5821 diffs |= skb_vlan_tag_present(p) ^ skb_vlan_tag_present(skb);
5822 if (skb_vlan_tag_present(p))
5823 diffs |= skb_vlan_tag_get(p) ^ skb_vlan_tag_get(skb);
5824 diffs |= skb_metadata_dst_cmp(p, skb);
5825 diffs |= skb_metadata_differs(p, skb);
5826 if (maclen == ETH_HLEN)
5827 diffs |= compare_ether_header(skb_mac_header(p),
5828 skb_mac_header(skb));
5830 diffs = memcmp(skb_mac_header(p),
5831 skb_mac_header(skb),
5833 NAPI_GRO_CB(p)->same_flow = !diffs;
5839 static void skb_gro_reset_offset(struct sk_buff *skb)
5841 const struct skb_shared_info *pinfo = skb_shinfo(skb);
5842 const skb_frag_t *frag0 = &pinfo->frags[0];
5844 NAPI_GRO_CB(skb)->data_offset = 0;
5845 NAPI_GRO_CB(skb)->frag0 = NULL;
5846 NAPI_GRO_CB(skb)->frag0_len = 0;
5848 if (!skb_headlen(skb) && pinfo->nr_frags &&
5849 !PageHighMem(skb_frag_page(frag0))) {
5850 NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
5851 NAPI_GRO_CB(skb)->frag0_len = min_t(unsigned int,
5852 skb_frag_size(frag0),
5853 skb->end - skb->tail);
5857 static void gro_pull_from_frag0(struct sk_buff *skb, int grow)
5859 struct skb_shared_info *pinfo = skb_shinfo(skb);
5861 BUG_ON(skb->end - skb->tail < grow);
5863 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
5865 skb->data_len -= grow;
5868 skb_frag_off_add(&pinfo->frags[0], grow);
5869 skb_frag_size_sub(&pinfo->frags[0], grow);
5871 if (unlikely(!skb_frag_size(&pinfo->frags[0]))) {
5872 skb_frag_unref(skb, 0);
5873 memmove(pinfo->frags, pinfo->frags + 1,
5874 --pinfo->nr_frags * sizeof(pinfo->frags[0]));
5878 static void gro_flush_oldest(struct napi_struct *napi, struct list_head *head)
5880 struct sk_buff *oldest;
5882 oldest = list_last_entry(head, struct sk_buff, list);
5884 /* We are called with head length >= MAX_GRO_SKBS, so this is
5887 if (WARN_ON_ONCE(!oldest))
5890 /* Do not adjust napi->gro_hash[].count, caller is adding a new
5893 skb_list_del_init(oldest);
5894 napi_gro_complete(napi, oldest);
5897 INDIRECT_CALLABLE_DECLARE(struct sk_buff *inet_gro_receive(struct list_head *,
5899 INDIRECT_CALLABLE_DECLARE(struct sk_buff *ipv6_gro_receive(struct list_head *,
5901 static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
5903 u32 hash = skb_get_hash_raw(skb) & (GRO_HASH_BUCKETS - 1);
5904 struct list_head *head = &offload_base;
5905 struct packet_offload *ptype;
5906 __be16 type = skb->protocol;
5907 struct list_head *gro_head;
5908 struct sk_buff *pp = NULL;
5909 enum gro_result ret;
5913 if (netif_elide_gro(skb->dev))
5916 gro_head = gro_list_prepare(napi, skb);
5919 list_for_each_entry_rcu(ptype, head, list) {
5920 if (ptype->type != type || !ptype->callbacks.gro_receive)
5923 skb_set_network_header(skb, skb_gro_offset(skb));
5924 skb_reset_mac_len(skb);
5925 NAPI_GRO_CB(skb)->same_flow = 0;
5926 NAPI_GRO_CB(skb)->flush = skb_is_gso(skb) || skb_has_frag_list(skb);
5927 NAPI_GRO_CB(skb)->free = 0;
5928 NAPI_GRO_CB(skb)->encap_mark = 0;
5929 NAPI_GRO_CB(skb)->recursion_counter = 0;
5930 NAPI_GRO_CB(skb)->is_fou = 0;
5931 NAPI_GRO_CB(skb)->is_atomic = 1;
5932 NAPI_GRO_CB(skb)->gro_remcsum_start = 0;
5934 /* Setup for GRO checksum validation */
5935 switch (skb->ip_summed) {
5936 case CHECKSUM_COMPLETE:
5937 NAPI_GRO_CB(skb)->csum = skb->csum;
5938 NAPI_GRO_CB(skb)->csum_valid = 1;
5939 NAPI_GRO_CB(skb)->csum_cnt = 0;
5941 case CHECKSUM_UNNECESSARY:
5942 NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1;
5943 NAPI_GRO_CB(skb)->csum_valid = 0;
5946 NAPI_GRO_CB(skb)->csum_cnt = 0;
5947 NAPI_GRO_CB(skb)->csum_valid = 0;
5950 pp = INDIRECT_CALL_INET(ptype->callbacks.gro_receive,
5951 ipv6_gro_receive, inet_gro_receive,
5957 if (&ptype->list == head)
5960 if (PTR_ERR(pp) == -EINPROGRESS) {
5965 same_flow = NAPI_GRO_CB(skb)->same_flow;
5966 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
5969 skb_list_del_init(pp);
5970 napi_gro_complete(napi, pp);
5971 napi->gro_hash[hash].count--;
5977 if (NAPI_GRO_CB(skb)->flush)
5980 if (unlikely(napi->gro_hash[hash].count >= MAX_GRO_SKBS)) {
5981 gro_flush_oldest(napi, gro_head);
5983 napi->gro_hash[hash].count++;
5985 NAPI_GRO_CB(skb)->count = 1;
5986 NAPI_GRO_CB(skb)->age = jiffies;
5987 NAPI_GRO_CB(skb)->last = skb;
5988 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
5989 list_add(&skb->list, gro_head);
5993 grow = skb_gro_offset(skb) - skb_headlen(skb);
5995 gro_pull_from_frag0(skb, grow);
5997 if (napi->gro_hash[hash].count) {
5998 if (!test_bit(hash, &napi->gro_bitmask))
5999 __set_bit(hash, &napi->gro_bitmask);
6000 } else if (test_bit(hash, &napi->gro_bitmask)) {
6001 __clear_bit(hash, &napi->gro_bitmask);
6011 struct packet_offload *gro_find_receive_by_type(__be16 type)
6013 struct list_head *offload_head = &offload_base;
6014 struct packet_offload *ptype;
6016 list_for_each_entry_rcu(ptype, offload_head, list) {
6017 if (ptype->type != type || !ptype->callbacks.gro_receive)
6023 EXPORT_SYMBOL(gro_find_receive_by_type);
6025 struct packet_offload *gro_find_complete_by_type(__be16 type)
6027 struct list_head *offload_head = &offload_base;
6028 struct packet_offload *ptype;
6030 list_for_each_entry_rcu(ptype, offload_head, list) {
6031 if (ptype->type != type || !ptype->callbacks.gro_complete)
6037 EXPORT_SYMBOL(gro_find_complete_by_type);
6039 static void napi_skb_free_stolen_head(struct sk_buff *skb)
6043 kmem_cache_free(skbuff_head_cache, skb);
6046 static gro_result_t napi_skb_finish(struct napi_struct *napi,
6047 struct sk_buff *skb,
6052 gro_normal_one(napi, skb);
6059 case GRO_MERGED_FREE:
6060 if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
6061 napi_skb_free_stolen_head(skb);
6075 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
6079 skb_mark_napi_id(skb, napi);
6080 trace_napi_gro_receive_entry(skb);
6082 skb_gro_reset_offset(skb);
6084 ret = napi_skb_finish(napi, skb, dev_gro_receive(napi, skb));
6085 trace_napi_gro_receive_exit(ret);
6089 EXPORT_SYMBOL(napi_gro_receive);
6091 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
6093 if (unlikely(skb->pfmemalloc)) {
6097 __skb_pull(skb, skb_headlen(skb));
6098 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
6099 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
6100 __vlan_hwaccel_clear_tag(skb);
6101 skb->dev = napi->dev;
6104 /* eth_type_trans() assumes pkt_type is PACKET_HOST */
6105 skb->pkt_type = PACKET_HOST;
6107 skb->encapsulation = 0;
6108 skb_shinfo(skb)->gso_type = 0;
6109 skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
6115 struct sk_buff *napi_get_frags(struct napi_struct *napi)
6117 struct sk_buff *skb = napi->skb;
6120 skb = napi_alloc_skb(napi, GRO_MAX_HEAD);
6123 skb_mark_napi_id(skb, napi);
6128 EXPORT_SYMBOL(napi_get_frags);
6130 static gro_result_t napi_frags_finish(struct napi_struct *napi,
6131 struct sk_buff *skb,
6137 __skb_push(skb, ETH_HLEN);
6138 skb->protocol = eth_type_trans(skb, skb->dev);
6139 if (ret == GRO_NORMAL)
6140 gro_normal_one(napi, skb);
6144 napi_reuse_skb(napi, skb);
6147 case GRO_MERGED_FREE:
6148 if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
6149 napi_skb_free_stolen_head(skb);
6151 napi_reuse_skb(napi, skb);
6162 /* Upper GRO stack assumes network header starts at gro_offset=0
6163 * Drivers could call both napi_gro_frags() and napi_gro_receive()
6164 * We copy ethernet header into skb->data to have a common layout.
6166 static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
6168 struct sk_buff *skb = napi->skb;
6169 const struct ethhdr *eth;
6170 unsigned int hlen = sizeof(*eth);
6174 skb_reset_mac_header(skb);
6175 skb_gro_reset_offset(skb);
6177 if (unlikely(skb_gro_header_hard(skb, hlen))) {
6178 eth = skb_gro_header_slow(skb, hlen, 0);
6179 if (unlikely(!eth)) {
6180 net_warn_ratelimited("%s: dropping impossible skb from %s\n",
6181 __func__, napi->dev->name);
6182 napi_reuse_skb(napi, skb);
6186 eth = (const struct ethhdr *)skb->data;
6187 gro_pull_from_frag0(skb, hlen);
6188 NAPI_GRO_CB(skb)->frag0 += hlen;
6189 NAPI_GRO_CB(skb)->frag0_len -= hlen;
6191 __skb_pull(skb, hlen);
6194 * This works because the only protocols we care about don't require
6196 * We'll fix it up properly in napi_frags_finish()
6198 skb->protocol = eth->h_proto;
6203 gro_result_t napi_gro_frags(struct napi_struct *napi)
6206 struct sk_buff *skb = napi_frags_skb(napi);
6211 trace_napi_gro_frags_entry(skb);
6213 ret = napi_frags_finish(napi, skb, dev_gro_receive(napi, skb));
6214 trace_napi_gro_frags_exit(ret);
6218 EXPORT_SYMBOL(napi_gro_frags);
6220 /* Compute the checksum from gro_offset and return the folded value
6221 * after adding in any pseudo checksum.
6223 __sum16 __skb_gro_checksum_complete(struct sk_buff *skb)
6228 wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0);
6230 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
6231 sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum));
6232 /* See comments in __skb_checksum_complete(). */
6234 if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) &&
6235 !skb->csum_complete_sw)
6236 netdev_rx_csum_fault(skb->dev, skb);
6239 NAPI_GRO_CB(skb)->csum = wsum;
6240 NAPI_GRO_CB(skb)->csum_valid = 1;
6244 EXPORT_SYMBOL(__skb_gro_checksum_complete);
6246 static void net_rps_send_ipi(struct softnet_data *remsd)
6250 struct softnet_data *next = remsd->rps_ipi_next;
6252 if (cpu_online(remsd->cpu))
6253 smp_call_function_single_async(remsd->cpu, &remsd->csd);
6260 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
6261 * Note: called with local irq disabled, but exits with local irq enabled.
6263 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
6266 struct softnet_data *remsd = sd->rps_ipi_list;
6269 sd->rps_ipi_list = NULL;
6273 /* Send pending IPI's to kick RPS processing on remote cpus. */
6274 net_rps_send_ipi(remsd);
6280 static bool sd_has_rps_ipi_waiting(struct softnet_data *sd)
6283 return sd->rps_ipi_list != NULL;
6289 static int process_backlog(struct napi_struct *napi, int quota)
6291 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
6295 /* Check if we have pending ipi, its better to send them now,
6296 * not waiting net_rx_action() end.
6298 if (sd_has_rps_ipi_waiting(sd)) {
6299 local_irq_disable();
6300 net_rps_action_and_irq_enable(sd);
6303 napi->weight = dev_rx_weight;
6305 struct sk_buff *skb;
6307 while ((skb = __skb_dequeue(&sd->process_queue))) {
6309 __netif_receive_skb(skb);
6311 input_queue_head_incr(sd);
6312 if (++work >= quota)
6317 local_irq_disable();
6319 if (skb_queue_empty(&sd->input_pkt_queue)) {
6321 * Inline a custom version of __napi_complete().
6322 * only current cpu owns and manipulates this napi,
6323 * and NAPI_STATE_SCHED is the only possible flag set
6325 * We can use a plain write instead of clear_bit(),
6326 * and we dont need an smp_mb() memory barrier.
6331 skb_queue_splice_tail_init(&sd->input_pkt_queue,
6332 &sd->process_queue);
6342 * __napi_schedule - schedule for receive
6343 * @n: entry to schedule
6345 * The entry's receive function will be scheduled to run.
6346 * Consider using __napi_schedule_irqoff() if hard irqs are masked.
6348 void __napi_schedule(struct napi_struct *n)
6350 unsigned long flags;
6352 local_irq_save(flags);
6353 ____napi_schedule(this_cpu_ptr(&softnet_data), n);
6354 local_irq_restore(flags);
6356 EXPORT_SYMBOL(__napi_schedule);
6359 * napi_schedule_prep - check if napi can be scheduled
6362 * Test if NAPI routine is already running, and if not mark
6363 * it as running. This is used as a condition variable to
6364 * insure only one NAPI poll instance runs. We also make
6365 * sure there is no pending NAPI disable.
6367 bool napi_schedule_prep(struct napi_struct *n)
6369 unsigned long val, new;
6372 val = READ_ONCE(n->state);
6373 if (unlikely(val & NAPIF_STATE_DISABLE))
6375 new = val | NAPIF_STATE_SCHED;
6377 /* Sets STATE_MISSED bit if STATE_SCHED was already set
6378 * This was suggested by Alexander Duyck, as compiler
6379 * emits better code than :
6380 * if (val & NAPIF_STATE_SCHED)
6381 * new |= NAPIF_STATE_MISSED;
6383 new |= (val & NAPIF_STATE_SCHED) / NAPIF_STATE_SCHED *
6385 } while (cmpxchg(&n->state, val, new) != val);
6387 return !(val & NAPIF_STATE_SCHED);
6389 EXPORT_SYMBOL(napi_schedule_prep);
6392 * __napi_schedule_irqoff - schedule for receive
6393 * @n: entry to schedule
6395 * Variant of __napi_schedule() assuming hard irqs are masked
6397 void __napi_schedule_irqoff(struct napi_struct *n)
6399 ____napi_schedule(this_cpu_ptr(&softnet_data), n);
6401 EXPORT_SYMBOL(__napi_schedule_irqoff);
6403 bool napi_complete_done(struct napi_struct *n, int work_done)
6405 unsigned long flags, val, new, timeout = 0;
6409 * 1) Don't let napi dequeue from the cpu poll list
6410 * just in case its running on a different cpu.
6411 * 2) If we are busy polling, do nothing here, we have
6412 * the guarantee we will be called later.
6414 if (unlikely(n->state & (NAPIF_STATE_NPSVC |
6415 NAPIF_STATE_IN_BUSY_POLL)))
6420 timeout = READ_ONCE(n->dev->gro_flush_timeout);
6421 n->defer_hard_irqs_count = READ_ONCE(n->dev->napi_defer_hard_irqs);
6423 if (n->defer_hard_irqs_count > 0) {
6424 n->defer_hard_irqs_count--;
6425 timeout = READ_ONCE(n->dev->gro_flush_timeout);
6429 if (n->gro_bitmask) {
6430 /* When the NAPI instance uses a timeout and keeps postponing
6431 * it, we need to bound somehow the time packets are kept in
6434 napi_gro_flush(n, !!timeout);
6439 if (unlikely(!list_empty(&n->poll_list))) {
6440 /* If n->poll_list is not empty, we need to mask irqs */
6441 local_irq_save(flags);
6442 list_del_init(&n->poll_list);
6443 local_irq_restore(flags);
6447 val = READ_ONCE(n->state);
6449 WARN_ON_ONCE(!(val & NAPIF_STATE_SCHED));
6451 new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED |
6452 NAPIF_STATE_PREFER_BUSY_POLL);
6454 /* If STATE_MISSED was set, leave STATE_SCHED set,
6455 * because we will call napi->poll() one more time.
6456 * This C code was suggested by Alexander Duyck to help gcc.
6458 new |= (val & NAPIF_STATE_MISSED) / NAPIF_STATE_MISSED *
6460 } while (cmpxchg(&n->state, val, new) != val);
6462 if (unlikely(val & NAPIF_STATE_MISSED)) {
6468 hrtimer_start(&n->timer, ns_to_ktime(timeout),
6469 HRTIMER_MODE_REL_PINNED);
6472 EXPORT_SYMBOL(napi_complete_done);
6474 /* must be called under rcu_read_lock(), as we dont take a reference */
6475 static struct napi_struct *napi_by_id(unsigned int napi_id)
6477 unsigned int hash = napi_id % HASH_SIZE(napi_hash);
6478 struct napi_struct *napi;
6480 hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node)
6481 if (napi->napi_id == napi_id)
6487 #if defined(CONFIG_NET_RX_BUSY_POLL)
6489 static void __busy_poll_stop(struct napi_struct *napi, bool skip_schedule)
6491 if (!skip_schedule) {
6492 gro_normal_list(napi);
6493 __napi_schedule(napi);
6497 if (napi->gro_bitmask) {
6498 /* flush too old packets
6499 * If HZ < 1000, flush all packets.
6501 napi_gro_flush(napi, HZ >= 1000);
6504 gro_normal_list(napi);
6505 clear_bit(NAPI_STATE_SCHED, &napi->state);
6508 static void busy_poll_stop(struct napi_struct *napi, void *have_poll_lock, bool prefer_busy_poll,
6511 bool skip_schedule = false;
6512 unsigned long timeout;
6515 /* Busy polling means there is a high chance device driver hard irq
6516 * could not grab NAPI_STATE_SCHED, and that NAPI_STATE_MISSED was
6517 * set in napi_schedule_prep().
6518 * Since we are about to call napi->poll() once more, we can safely
6519 * clear NAPI_STATE_MISSED.
6521 * Note: x86 could use a single "lock and ..." instruction
6522 * to perform these two clear_bit()
6524 clear_bit(NAPI_STATE_MISSED, &napi->state);
6525 clear_bit(NAPI_STATE_IN_BUSY_POLL, &napi->state);
6529 if (prefer_busy_poll) {
6530 napi->defer_hard_irqs_count = READ_ONCE(napi->dev->napi_defer_hard_irqs);
6531 timeout = READ_ONCE(napi->dev->gro_flush_timeout);
6532 if (napi->defer_hard_irqs_count && timeout) {
6533 hrtimer_start(&napi->timer, ns_to_ktime(timeout), HRTIMER_MODE_REL_PINNED);
6534 skip_schedule = true;
6538 /* All we really want here is to re-enable device interrupts.
6539 * Ideally, a new ndo_busy_poll_stop() could avoid another round.
6541 rc = napi->poll(napi, budget);
6542 /* We can't gro_normal_list() here, because napi->poll() might have
6543 * rearmed the napi (napi_complete_done()) in which case it could
6544 * already be running on another CPU.
6546 trace_napi_poll(napi, rc, budget);
6547 netpoll_poll_unlock(have_poll_lock);
6549 __busy_poll_stop(napi, skip_schedule);
6553 void napi_busy_loop(unsigned int napi_id,
6554 bool (*loop_end)(void *, unsigned long),
6555 void *loop_end_arg, bool prefer_busy_poll, u16 budget)
6557 unsigned long start_time = loop_end ? busy_loop_current_time() : 0;
6558 int (*napi_poll)(struct napi_struct *napi, int budget);
6559 void *have_poll_lock = NULL;
6560 struct napi_struct *napi;
6567 napi = napi_by_id(napi_id);
6577 unsigned long val = READ_ONCE(napi->state);
6579 /* If multiple threads are competing for this napi,
6580 * we avoid dirtying napi->state as much as we can.
6582 if (val & (NAPIF_STATE_DISABLE | NAPIF_STATE_SCHED |
6583 NAPIF_STATE_IN_BUSY_POLL)) {
6584 if (prefer_busy_poll)
6585 set_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state);
6588 if (cmpxchg(&napi->state, val,
6589 val | NAPIF_STATE_IN_BUSY_POLL |
6590 NAPIF_STATE_SCHED) != val) {
6591 if (prefer_busy_poll)
6592 set_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state);
6595 have_poll_lock = netpoll_poll_lock(napi);
6596 napi_poll = napi->poll;
6598 work = napi_poll(napi, budget);
6599 trace_napi_poll(napi, work, budget);
6600 gro_normal_list(napi);
6603 __NET_ADD_STATS(dev_net(napi->dev),
6604 LINUX_MIB_BUSYPOLLRXPACKETS, work);
6607 if (!loop_end || loop_end(loop_end_arg, start_time))
6610 if (unlikely(need_resched())) {
6612 busy_poll_stop(napi, have_poll_lock, prefer_busy_poll, budget);
6616 if (loop_end(loop_end_arg, start_time))
6623 busy_poll_stop(napi, have_poll_lock, prefer_busy_poll, budget);
6628 EXPORT_SYMBOL(napi_busy_loop);
6630 #endif /* CONFIG_NET_RX_BUSY_POLL */
6632 static void napi_hash_add(struct napi_struct *napi)
6634 if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state))
6637 spin_lock(&napi_hash_lock);
6639 /* 0..NR_CPUS range is reserved for sender_cpu use */
6641 if (unlikely(++napi_gen_id < MIN_NAPI_ID))
6642 napi_gen_id = MIN_NAPI_ID;
6643 } while (napi_by_id(napi_gen_id));
6644 napi->napi_id = napi_gen_id;
6646 hlist_add_head_rcu(&napi->napi_hash_node,
6647 &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]);
6649 spin_unlock(&napi_hash_lock);
6652 /* Warning : caller is responsible to make sure rcu grace period
6653 * is respected before freeing memory containing @napi
6655 static void napi_hash_del(struct napi_struct *napi)
6657 spin_lock(&napi_hash_lock);
6659 hlist_del_init_rcu(&napi->napi_hash_node);
6661 spin_unlock(&napi_hash_lock);
6664 static enum hrtimer_restart napi_watchdog(struct hrtimer *timer)
6666 struct napi_struct *napi;
6668 napi = container_of(timer, struct napi_struct, timer);
6670 /* Note : we use a relaxed variant of napi_schedule_prep() not setting
6671 * NAPI_STATE_MISSED, since we do not react to a device IRQ.
6673 if (!napi_disable_pending(napi) &&
6674 !test_and_set_bit(NAPI_STATE_SCHED, &napi->state)) {
6675 clear_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state);
6676 __napi_schedule_irqoff(napi);
6679 return HRTIMER_NORESTART;
6682 static void init_gro_hash(struct napi_struct *napi)
6686 for (i = 0; i < GRO_HASH_BUCKETS; i++) {
6687 INIT_LIST_HEAD(&napi->gro_hash[i].list);
6688 napi->gro_hash[i].count = 0;
6690 napi->gro_bitmask = 0;
6693 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
6694 int (*poll)(struct napi_struct *, int), int weight)
6696 if (WARN_ON(test_and_set_bit(NAPI_STATE_LISTED, &napi->state)))
6699 INIT_LIST_HEAD(&napi->poll_list);
6700 INIT_HLIST_NODE(&napi->napi_hash_node);
6701 hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED);
6702 napi->timer.function = napi_watchdog;
6703 init_gro_hash(napi);
6705 INIT_LIST_HEAD(&napi->rx_list);
6708 if (weight > NAPI_POLL_WEIGHT)
6709 netdev_err_once(dev, "%s() called with weight %d\n", __func__,
6711 napi->weight = weight;
6713 #ifdef CONFIG_NETPOLL
6714 napi->poll_owner = -1;
6716 set_bit(NAPI_STATE_SCHED, &napi->state);
6717 set_bit(NAPI_STATE_NPSVC, &napi->state);
6718 list_add_rcu(&napi->dev_list, &dev->napi_list);
6719 napi_hash_add(napi);
6721 EXPORT_SYMBOL(netif_napi_add);
6723 void napi_disable(struct napi_struct *n)
6726 set_bit(NAPI_STATE_DISABLE, &n->state);
6728 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
6730 while (test_and_set_bit(NAPI_STATE_NPSVC, &n->state))
6733 hrtimer_cancel(&n->timer);
6735 clear_bit(NAPI_STATE_PREFER_BUSY_POLL, &n->state);
6736 clear_bit(NAPI_STATE_DISABLE, &n->state);
6738 EXPORT_SYMBOL(napi_disable);
6740 static void flush_gro_hash(struct napi_struct *napi)
6744 for (i = 0; i < GRO_HASH_BUCKETS; i++) {
6745 struct sk_buff *skb, *n;
6747 list_for_each_entry_safe(skb, n, &napi->gro_hash[i].list, list)
6749 napi->gro_hash[i].count = 0;
6753 /* Must be called in process context */
6754 void __netif_napi_del(struct napi_struct *napi)
6756 if (!test_and_clear_bit(NAPI_STATE_LISTED, &napi->state))
6759 napi_hash_del(napi);
6760 list_del_rcu(&napi->dev_list);
6761 napi_free_frags(napi);
6763 flush_gro_hash(napi);
6764 napi->gro_bitmask = 0;
6766 EXPORT_SYMBOL(__netif_napi_del);
6768 static int napi_poll(struct napi_struct *n, struct list_head *repoll)
6773 list_del_init(&n->poll_list);
6775 have = netpoll_poll_lock(n);
6779 /* This NAPI_STATE_SCHED test is for avoiding a race
6780 * with netpoll's poll_napi(). Only the entity which
6781 * obtains the lock and sees NAPI_STATE_SCHED set will
6782 * actually make the ->poll() call. Therefore we avoid
6783 * accidentally calling ->poll() when NAPI is not scheduled.
6786 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
6787 work = n->poll(n, weight);
6788 trace_napi_poll(n, work, weight);
6791 if (unlikely(work > weight))
6792 pr_err_once("NAPI poll function %pS returned %d, exceeding its budget of %d.\n",
6793 n->poll, work, weight);
6795 if (likely(work < weight))
6798 /* Drivers must not modify the NAPI state if they
6799 * consume the entire weight. In such cases this code
6800 * still "owns" the NAPI instance and therefore can
6801 * move the instance around on the list at-will.
6803 if (unlikely(napi_disable_pending(n))) {
6808 /* The NAPI context has more processing work, but busy-polling
6809 * is preferred. Exit early.
6811 if (napi_prefer_busy_poll(n)) {
6812 if (napi_complete_done(n, work)) {
6813 /* If timeout is not set, we need to make sure
6814 * that the NAPI is re-scheduled.
6821 if (n->gro_bitmask) {
6822 /* flush too old packets
6823 * If HZ < 1000, flush all packets.
6825 napi_gro_flush(n, HZ >= 1000);
6830 /* Some drivers may have called napi_schedule
6831 * prior to exhausting their budget.
6833 if (unlikely(!list_empty(&n->poll_list))) {
6834 pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
6835 n->dev ? n->dev->name : "backlog");
6839 list_add_tail(&n->poll_list, repoll);
6842 netpoll_poll_unlock(have);
6847 static __latent_entropy void net_rx_action(struct softirq_action *h)
6849 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
6850 unsigned long time_limit = jiffies +
6851 usecs_to_jiffies(netdev_budget_usecs);
6852 int budget = netdev_budget;
6856 local_irq_disable();
6857 list_splice_init(&sd->poll_list, &list);
6861 struct napi_struct *n;
6863 if (list_empty(&list)) {
6864 if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll))
6869 n = list_first_entry(&list, struct napi_struct, poll_list);
6870 budget -= napi_poll(n, &repoll);
6872 /* If softirq window is exhausted then punt.
6873 * Allow this to run for 2 jiffies since which will allow
6874 * an average latency of 1.5/HZ.
6876 if (unlikely(budget <= 0 ||
6877 time_after_eq(jiffies, time_limit))) {
6883 local_irq_disable();
6885 list_splice_tail_init(&sd->poll_list, &list);
6886 list_splice_tail(&repoll, &list);
6887 list_splice(&list, &sd->poll_list);
6888 if (!list_empty(&sd->poll_list))
6889 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
6891 net_rps_action_and_irq_enable(sd);
6893 __kfree_skb_flush();
6896 struct netdev_adjacent {
6897 struct net_device *dev;
6899 /* upper master flag, there can only be one master device per list */
6902 /* lookup ignore flag */
6905 /* counter for the number of times this device was added to us */
6908 /* private field for the users */
6911 struct list_head list;
6912 struct rcu_head rcu;
6915 static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev,
6916 struct list_head *adj_list)
6918 struct netdev_adjacent *adj;
6920 list_for_each_entry(adj, adj_list, list) {
6921 if (adj->dev == adj_dev)
6927 static int ____netdev_has_upper_dev(struct net_device *upper_dev,
6928 struct netdev_nested_priv *priv)
6930 struct net_device *dev = (struct net_device *)priv->data;
6932 return upper_dev == dev;
6936 * netdev_has_upper_dev - Check if device is linked to an upper device
6938 * @upper_dev: upper device to check
6940 * Find out if a device is linked to specified upper device and return true
6941 * in case it is. Note that this checks only immediate upper device,
6942 * not through a complete stack of devices. The caller must hold the RTNL lock.
6944 bool netdev_has_upper_dev(struct net_device *dev,
6945 struct net_device *upper_dev)
6947 struct netdev_nested_priv priv = {
6948 .data = (void *)upper_dev,
6953 return netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev,
6956 EXPORT_SYMBOL(netdev_has_upper_dev);
6959 * netdev_has_upper_dev_all_rcu - Check if device is linked to an upper device
6961 * @upper_dev: upper device to check
6963 * Find out if a device is linked to specified upper device and return true
6964 * in case it is. Note that this checks the entire upper device chain.
6965 * The caller must hold rcu lock.
6968 bool netdev_has_upper_dev_all_rcu(struct net_device *dev,
6969 struct net_device *upper_dev)
6971 struct netdev_nested_priv priv = {
6972 .data = (void *)upper_dev,
6975 return !!netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev,
6978 EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu);
6981 * netdev_has_any_upper_dev - Check if device is linked to some device
6984 * Find out if a device is linked to an upper device and return true in case
6985 * it is. The caller must hold the RTNL lock.
6987 bool netdev_has_any_upper_dev(struct net_device *dev)
6991 return !list_empty(&dev->adj_list.upper);
6993 EXPORT_SYMBOL(netdev_has_any_upper_dev);
6996 * netdev_master_upper_dev_get - Get master upper device
6999 * Find a master upper device and return pointer to it or NULL in case
7000 * it's not there. The caller must hold the RTNL lock.
7002 struct net_device *netdev_master_upper_dev_get(struct net_device *dev)
7004 struct netdev_adjacent *upper;
7008 if (list_empty(&dev->adj_list.upper))
7011 upper = list_first_entry(&dev->adj_list.upper,
7012 struct netdev_adjacent, list);
7013 if (likely(upper->master))
7017 EXPORT_SYMBOL(netdev_master_upper_dev_get);
7019 static struct net_device *__netdev_master_upper_dev_get(struct net_device *dev)
7021 struct netdev_adjacent *upper;
7025 if (list_empty(&dev->adj_list.upper))
7028 upper = list_first_entry(&dev->adj_list.upper,
7029 struct netdev_adjacent, list);
7030 if (likely(upper->master) && !upper->ignore)
7036 * netdev_has_any_lower_dev - Check if device is linked to some device
7039 * Find out if a device is linked to a lower device and return true in case
7040 * it is. The caller must hold the RTNL lock.
7042 static bool netdev_has_any_lower_dev(struct net_device *dev)
7046 return !list_empty(&dev->adj_list.lower);
7049 void *netdev_adjacent_get_private(struct list_head *adj_list)
7051 struct netdev_adjacent *adj;
7053 adj = list_entry(adj_list, struct netdev_adjacent, list);
7055 return adj->private;
7057 EXPORT_SYMBOL(netdev_adjacent_get_private);
7060 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
7062 * @iter: list_head ** of the current position
7064 * Gets the next device from the dev's upper list, starting from iter
7065 * position. The caller must hold RCU read lock.
7067 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
7068 struct list_head **iter)
7070 struct netdev_adjacent *upper;
7072 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
7074 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
7076 if (&upper->list == &dev->adj_list.upper)
7079 *iter = &upper->list;
7083 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu);
7085 static struct net_device *__netdev_next_upper_dev(struct net_device *dev,
7086 struct list_head **iter,
7089 struct netdev_adjacent *upper;
7091 upper = list_entry((*iter)->next, struct netdev_adjacent, list);
7093 if (&upper->list == &dev->adj_list.upper)
7096 *iter = &upper->list;
7097 *ignore = upper->ignore;
7102 static struct net_device *netdev_next_upper_dev_rcu(struct net_device *dev,
7103 struct list_head **iter)
7105 struct netdev_adjacent *upper;
7107 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
7109 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
7111 if (&upper->list == &dev->adj_list.upper)
7114 *iter = &upper->list;
7119 static int __netdev_walk_all_upper_dev(struct net_device *dev,
7120 int (*fn)(struct net_device *dev,
7121 struct netdev_nested_priv *priv),
7122 struct netdev_nested_priv *priv)
7124 struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
7125 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
7130 iter = &dev->adj_list.upper;
7134 ret = fn(now, priv);
7141 udev = __netdev_next_upper_dev(now, &iter, &ignore);
7148 niter = &udev->adj_list.upper;
7149 dev_stack[cur] = now;
7150 iter_stack[cur++] = iter;
7157 next = dev_stack[--cur];
7158 niter = iter_stack[cur];
7168 int netdev_walk_all_upper_dev_rcu(struct net_device *dev,
7169 int (*fn)(struct net_device *dev,
7170 struct netdev_nested_priv *priv),
7171 struct netdev_nested_priv *priv)
7173 struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
7174 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
7178 iter = &dev->adj_list.upper;
7182 ret = fn(now, priv);
7189 udev = netdev_next_upper_dev_rcu(now, &iter);
7194 niter = &udev->adj_list.upper;
7195 dev_stack[cur] = now;
7196 iter_stack[cur++] = iter;
7203 next = dev_stack[--cur];
7204 niter = iter_stack[cur];
7213 EXPORT_SYMBOL_GPL(netdev_walk_all_upper_dev_rcu);
7215 static bool __netdev_has_upper_dev(struct net_device *dev,
7216 struct net_device *upper_dev)
7218 struct netdev_nested_priv priv = {
7220 .data = (void *)upper_dev,
7225 return __netdev_walk_all_upper_dev(dev, ____netdev_has_upper_dev,
7230 * netdev_lower_get_next_private - Get the next ->private from the
7231 * lower neighbour list
7233 * @iter: list_head ** of the current position
7235 * Gets the next netdev_adjacent->private from the dev's lower neighbour
7236 * list, starting from iter position. The caller must hold either hold the
7237 * RTNL lock or its own locking that guarantees that the neighbour lower
7238 * list will remain unchanged.
7240 void *netdev_lower_get_next_private(struct net_device *dev,
7241 struct list_head **iter)
7243 struct netdev_adjacent *lower;
7245 lower = list_entry(*iter, struct netdev_adjacent, list);
7247 if (&lower->list == &dev->adj_list.lower)
7250 *iter = lower->list.next;
7252 return lower->private;
7254 EXPORT_SYMBOL(netdev_lower_get_next_private);
7257 * netdev_lower_get_next_private_rcu - Get the next ->private from the
7258 * lower neighbour list, RCU
7261 * @iter: list_head ** of the current position
7263 * Gets the next netdev_adjacent->private from the dev's lower neighbour
7264 * list, starting from iter position. The caller must hold RCU read lock.
7266 void *netdev_lower_get_next_private_rcu(struct net_device *dev,
7267 struct list_head **iter)
7269 struct netdev_adjacent *lower;
7271 WARN_ON_ONCE(!rcu_read_lock_held());
7273 lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
7275 if (&lower->list == &dev->adj_list.lower)
7278 *iter = &lower->list;
7280 return lower->private;
7282 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);
7285 * netdev_lower_get_next - Get the next device from the lower neighbour
7288 * @iter: list_head ** of the current position
7290 * Gets the next netdev_adjacent from the dev's lower neighbour
7291 * list, starting from iter position. The caller must hold RTNL lock or
7292 * its own locking that guarantees that the neighbour lower
7293 * list will remain unchanged.
7295 void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter)
7297 struct netdev_adjacent *lower;
7299 lower = list_entry(*iter, struct netdev_adjacent, list);
7301 if (&lower->list == &dev->adj_list.lower)
7304 *iter = lower->list.next;
7308 EXPORT_SYMBOL(netdev_lower_get_next);
7310 static struct net_device *netdev_next_lower_dev(struct net_device *dev,
7311 struct list_head **iter)
7313 struct netdev_adjacent *lower;
7315 lower = list_entry((*iter)->next, struct netdev_adjacent, list);
7317 if (&lower->list == &dev->adj_list.lower)
7320 *iter = &lower->list;
7325 static struct net_device *__netdev_next_lower_dev(struct net_device *dev,
7326 struct list_head **iter,
7329 struct netdev_adjacent *lower;
7331 lower = list_entry((*iter)->next, struct netdev_adjacent, list);
7333 if (&lower->list == &dev->adj_list.lower)
7336 *iter = &lower->list;
7337 *ignore = lower->ignore;
7342 int netdev_walk_all_lower_dev(struct net_device *dev,
7343 int (*fn)(struct net_device *dev,
7344 struct netdev_nested_priv *priv),
7345 struct netdev_nested_priv *priv)
7347 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
7348 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
7352 iter = &dev->adj_list.lower;
7356 ret = fn(now, priv);
7363 ldev = netdev_next_lower_dev(now, &iter);
7368 niter = &ldev->adj_list.lower;
7369 dev_stack[cur] = now;
7370 iter_stack[cur++] = iter;
7377 next = dev_stack[--cur];
7378 niter = iter_stack[cur];
7387 EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev);
7389 static int __netdev_walk_all_lower_dev(struct net_device *dev,
7390 int (*fn)(struct net_device *dev,
7391 struct netdev_nested_priv *priv),
7392 struct netdev_nested_priv *priv)
7394 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
7395 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
7400 iter = &dev->adj_list.lower;
7404 ret = fn(now, priv);
7411 ldev = __netdev_next_lower_dev(now, &iter, &ignore);
7418 niter = &ldev->adj_list.lower;
7419 dev_stack[cur] = now;
7420 iter_stack[cur++] = iter;
7427 next = dev_stack[--cur];
7428 niter = iter_stack[cur];
7438 struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev,
7439 struct list_head **iter)
7441 struct netdev_adjacent *lower;
7443 lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
7444 if (&lower->list == &dev->adj_list.lower)
7447 *iter = &lower->list;
7451 EXPORT_SYMBOL(netdev_next_lower_dev_rcu);
7453 static u8 __netdev_upper_depth(struct net_device *dev)
7455 struct net_device *udev;
7456 struct list_head *iter;
7460 for (iter = &dev->adj_list.upper,
7461 udev = __netdev_next_upper_dev(dev, &iter, &ignore);
7463 udev = __netdev_next_upper_dev(dev, &iter, &ignore)) {
7466 if (max_depth < udev->upper_level)
7467 max_depth = udev->upper_level;
7473 static u8 __netdev_lower_depth(struct net_device *dev)
7475 struct net_device *ldev;
7476 struct list_head *iter;
7480 for (iter = &dev->adj_list.lower,
7481 ldev = __netdev_next_lower_dev(dev, &iter, &ignore);
7483 ldev = __netdev_next_lower_dev(dev, &iter, &ignore)) {
7486 if (max_depth < ldev->lower_level)
7487 max_depth = ldev->lower_level;
7493 static int __netdev_update_upper_level(struct net_device *dev,
7494 struct netdev_nested_priv *__unused)
7496 dev->upper_level = __netdev_upper_depth(dev) + 1;
7500 static int __netdev_update_lower_level(struct net_device *dev,
7501 struct netdev_nested_priv *priv)
7503 dev->lower_level = __netdev_lower_depth(dev) + 1;
7505 #ifdef CONFIG_LOCKDEP
7509 if (priv->flags & NESTED_SYNC_IMM)
7510 dev->nested_level = dev->lower_level - 1;
7511 if (priv->flags & NESTED_SYNC_TODO)
7512 net_unlink_todo(dev);
7517 int netdev_walk_all_lower_dev_rcu(struct net_device *dev,
7518 int (*fn)(struct net_device *dev,
7519 struct netdev_nested_priv *priv),
7520 struct netdev_nested_priv *priv)
7522 struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1];
7523 struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1];
7527 iter = &dev->adj_list.lower;
7531 ret = fn(now, priv);
7538 ldev = netdev_next_lower_dev_rcu(now, &iter);
7543 niter = &ldev->adj_list.lower;
7544 dev_stack[cur] = now;
7545 iter_stack[cur++] = iter;
7552 next = dev_stack[--cur];
7553 niter = iter_stack[cur];
7562 EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev_rcu);
7565 * netdev_lower_get_first_private_rcu - Get the first ->private from the
7566 * lower neighbour list, RCU
7570 * Gets the first netdev_adjacent->private from the dev's lower neighbour
7571 * list. The caller must hold RCU read lock.
7573 void *netdev_lower_get_first_private_rcu(struct net_device *dev)
7575 struct netdev_adjacent *lower;
7577 lower = list_first_or_null_rcu(&dev->adj_list.lower,
7578 struct netdev_adjacent, list);
7580 return lower->private;
7583 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu);
7586 * netdev_master_upper_dev_get_rcu - Get master upper device
7589 * Find a master upper device and return pointer to it or NULL in case
7590 * it's not there. The caller must hold the RCU read lock.
7592 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev)
7594 struct netdev_adjacent *upper;
7596 upper = list_first_or_null_rcu(&dev->adj_list.upper,
7597 struct netdev_adjacent, list);
7598 if (upper && likely(upper->master))
7602 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);
7604 static int netdev_adjacent_sysfs_add(struct net_device *dev,
7605 struct net_device *adj_dev,
7606 struct list_head *dev_list)
7608 char linkname[IFNAMSIZ+7];
7610 sprintf(linkname, dev_list == &dev->adj_list.upper ?
7611 "upper_%s" : "lower_%s", adj_dev->name);
7612 return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj),
7615 static void netdev_adjacent_sysfs_del(struct net_device *dev,
7617 struct list_head *dev_list)
7619 char linkname[IFNAMSIZ+7];
7621 sprintf(linkname, dev_list == &dev->adj_list.upper ?
7622 "upper_%s" : "lower_%s", name);
7623 sysfs_remove_link(&(dev->dev.kobj), linkname);
7626 static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev,
7627 struct net_device *adj_dev,
7628 struct list_head *dev_list)
7630 return (dev_list == &dev->adj_list.upper ||
7631 dev_list == &dev->adj_list.lower) &&
7632 net_eq(dev_net(dev), dev_net(adj_dev));
7635 static int __netdev_adjacent_dev_insert(struct net_device *dev,
7636 struct net_device *adj_dev,
7637 struct list_head *dev_list,
7638 void *private, bool master)
7640 struct netdev_adjacent *adj;
7643 adj = __netdev_find_adj(adj_dev, dev_list);
7647 pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d\n",
7648 dev->name, adj_dev->name, adj->ref_nr);
7653 adj = kmalloc(sizeof(*adj), GFP_KERNEL);
7658 adj->master = master;
7660 adj->private = private;
7661 adj->ignore = false;
7664 pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d; dev_hold on %s\n",
7665 dev->name, adj_dev->name, adj->ref_nr, adj_dev->name);
7667 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) {
7668 ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list);
7673 /* Ensure that master link is always the first item in list. */
7675 ret = sysfs_create_link(&(dev->dev.kobj),
7676 &(adj_dev->dev.kobj), "master");
7678 goto remove_symlinks;
7680 list_add_rcu(&adj->list, dev_list);
7682 list_add_tail_rcu(&adj->list, dev_list);
7688 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
7689 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
7697 static void __netdev_adjacent_dev_remove(struct net_device *dev,
7698 struct net_device *adj_dev,
7700 struct list_head *dev_list)
7702 struct netdev_adjacent *adj;
7704 pr_debug("Remove adjacency: dev %s adj_dev %s ref_nr %d\n",
7705 dev->name, adj_dev->name, ref_nr);
7707 adj = __netdev_find_adj(adj_dev, dev_list);
7710 pr_err("Adjacency does not exist for device %s from %s\n",
7711 dev->name, adj_dev->name);
7716 if (adj->ref_nr > ref_nr) {
7717 pr_debug("adjacency: %s to %s ref_nr - %d = %d\n",
7718 dev->name, adj_dev->name, ref_nr,
7719 adj->ref_nr - ref_nr);
7720 adj->ref_nr -= ref_nr;
7725 sysfs_remove_link(&(dev->dev.kobj), "master");
7727 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
7728 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
7730 list_del_rcu(&adj->list);
7731 pr_debug("adjacency: dev_put for %s, because link removed from %s to %s\n",
7732 adj_dev->name, dev->name, adj_dev->name);
7734 kfree_rcu(adj, rcu);
7737 static int __netdev_adjacent_dev_link_lists(struct net_device *dev,
7738 struct net_device *upper_dev,
7739 struct list_head *up_list,
7740 struct list_head *down_list,
7741 void *private, bool master)
7745 ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list,
7750 ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list,
7753 __netdev_adjacent_dev_remove(dev, upper_dev, 1, up_list);
7760 static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev,
7761 struct net_device *upper_dev,
7763 struct list_head *up_list,
7764 struct list_head *down_list)
7766 __netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list);
7767 __netdev_adjacent_dev_remove(upper_dev, dev, ref_nr, down_list);
7770 static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev,
7771 struct net_device *upper_dev,
7772 void *private, bool master)
7774 return __netdev_adjacent_dev_link_lists(dev, upper_dev,
7775 &dev->adj_list.upper,
7776 &upper_dev->adj_list.lower,
7780 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev,
7781 struct net_device *upper_dev)
7783 __netdev_adjacent_dev_unlink_lists(dev, upper_dev, 1,
7784 &dev->adj_list.upper,
7785 &upper_dev->adj_list.lower);
7788 static int __netdev_upper_dev_link(struct net_device *dev,
7789 struct net_device *upper_dev, bool master,
7790 void *upper_priv, void *upper_info,
7791 struct netdev_nested_priv *priv,
7792 struct netlink_ext_ack *extack)
7794 struct netdev_notifier_changeupper_info changeupper_info = {
7799 .upper_dev = upper_dev,
7802 .upper_info = upper_info,
7804 struct net_device *master_dev;
7809 if (dev == upper_dev)
7812 /* To prevent loops, check if dev is not upper device to upper_dev. */
7813 if (__netdev_has_upper_dev(upper_dev, dev))
7816 if ((dev->lower_level + upper_dev->upper_level) > MAX_NEST_DEV)
7820 if (__netdev_has_upper_dev(dev, upper_dev))
7823 master_dev = __netdev_master_upper_dev_get(dev);
7825 return master_dev == upper_dev ? -EEXIST : -EBUSY;
7828 ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER,
7829 &changeupper_info.info);
7830 ret = notifier_to_errno(ret);
7834 ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, upper_priv,
7839 ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER,
7840 &changeupper_info.info);
7841 ret = notifier_to_errno(ret);
7845 __netdev_update_upper_level(dev, NULL);
7846 __netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL);
7848 __netdev_update_lower_level(upper_dev, priv);
7849 __netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level,
7855 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
7861 * netdev_upper_dev_link - Add a link to the upper device
7863 * @upper_dev: new upper device
7864 * @extack: netlink extended ack
7866 * Adds a link to device which is upper to this one. The caller must hold
7867 * the RTNL lock. On a failure a negative errno code is returned.
7868 * On success the reference counts are adjusted and the function
7871 int netdev_upper_dev_link(struct net_device *dev,
7872 struct net_device *upper_dev,
7873 struct netlink_ext_ack *extack)
7875 struct netdev_nested_priv priv = {
7876 .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO,
7880 return __netdev_upper_dev_link(dev, upper_dev, false,
7881 NULL, NULL, &priv, extack);
7883 EXPORT_SYMBOL(netdev_upper_dev_link);
7886 * netdev_master_upper_dev_link - Add a master link to the upper device
7888 * @upper_dev: new upper device
7889 * @upper_priv: upper device private
7890 * @upper_info: upper info to be passed down via notifier
7891 * @extack: netlink extended ack
7893 * Adds a link to device which is upper to this one. In this case, only
7894 * one master upper device can be linked, although other non-master devices
7895 * might be linked as well. The caller must hold the RTNL lock.
7896 * On a failure a negative errno code is returned. On success the reference
7897 * counts are adjusted and the function returns zero.
7899 int netdev_master_upper_dev_link(struct net_device *dev,
7900 struct net_device *upper_dev,
7901 void *upper_priv, void *upper_info,
7902 struct netlink_ext_ack *extack)
7904 struct netdev_nested_priv priv = {
7905 .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO,
7909 return __netdev_upper_dev_link(dev, upper_dev, true,
7910 upper_priv, upper_info, &priv, extack);
7912 EXPORT_SYMBOL(netdev_master_upper_dev_link);
7914 static void __netdev_upper_dev_unlink(struct net_device *dev,
7915 struct net_device *upper_dev,
7916 struct netdev_nested_priv *priv)
7918 struct netdev_notifier_changeupper_info changeupper_info = {
7922 .upper_dev = upper_dev,
7928 changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev;
7930 call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER,
7931 &changeupper_info.info);
7933 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
7935 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER,
7936 &changeupper_info.info);
7938 __netdev_update_upper_level(dev, NULL);
7939 __netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL);
7941 __netdev_update_lower_level(upper_dev, priv);
7942 __netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level,
7947 * netdev_upper_dev_unlink - Removes a link to upper device
7949 * @upper_dev: new upper device
7951 * Removes a link to device which is upper to this one. The caller must hold
7954 void netdev_upper_dev_unlink(struct net_device *dev,
7955 struct net_device *upper_dev)
7957 struct netdev_nested_priv priv = {
7958 .flags = NESTED_SYNC_TODO,
7962 __netdev_upper_dev_unlink(dev, upper_dev, &priv);
7964 EXPORT_SYMBOL(netdev_upper_dev_unlink);
7966 static void __netdev_adjacent_dev_set(struct net_device *upper_dev,
7967 struct net_device *lower_dev,
7970 struct netdev_adjacent *adj;
7972 adj = __netdev_find_adj(lower_dev, &upper_dev->adj_list.lower);
7976 adj = __netdev_find_adj(upper_dev, &lower_dev->adj_list.upper);
7981 static void netdev_adjacent_dev_disable(struct net_device *upper_dev,
7982 struct net_device *lower_dev)
7984 __netdev_adjacent_dev_set(upper_dev, lower_dev, true);
7987 static void netdev_adjacent_dev_enable(struct net_device *upper_dev,
7988 struct net_device *lower_dev)
7990 __netdev_adjacent_dev_set(upper_dev, lower_dev, false);
7993 int netdev_adjacent_change_prepare(struct net_device *old_dev,
7994 struct net_device *new_dev,
7995 struct net_device *dev,
7996 struct netlink_ext_ack *extack)
7998 struct netdev_nested_priv priv = {
8007 if (old_dev && new_dev != old_dev)
8008 netdev_adjacent_dev_disable(dev, old_dev);
8009 err = __netdev_upper_dev_link(new_dev, dev, false, NULL, NULL, &priv,
8012 if (old_dev && new_dev != old_dev)
8013 netdev_adjacent_dev_enable(dev, old_dev);
8019 EXPORT_SYMBOL(netdev_adjacent_change_prepare);
8021 void netdev_adjacent_change_commit(struct net_device *old_dev,
8022 struct net_device *new_dev,
8023 struct net_device *dev)
8025 struct netdev_nested_priv priv = {
8026 .flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO,
8030 if (!new_dev || !old_dev)
8033 if (new_dev == old_dev)
8036 netdev_adjacent_dev_enable(dev, old_dev);
8037 __netdev_upper_dev_unlink(old_dev, dev, &priv);
8039 EXPORT_SYMBOL(netdev_adjacent_change_commit);
8041 void netdev_adjacent_change_abort(struct net_device *old_dev,
8042 struct net_device *new_dev,
8043 struct net_device *dev)
8045 struct netdev_nested_priv priv = {
8053 if (old_dev && new_dev != old_dev)
8054 netdev_adjacent_dev_enable(dev, old_dev);
8056 __netdev_upper_dev_unlink(new_dev, dev, &priv);
8058 EXPORT_SYMBOL(netdev_adjacent_change_abort);
8061 * netdev_bonding_info_change - Dispatch event about slave change
8063 * @bonding_info: info to dispatch
8065 * Send NETDEV_BONDING_INFO to netdev notifiers with info.
8066 * The caller must hold the RTNL lock.
8068 void netdev_bonding_info_change(struct net_device *dev,
8069 struct netdev_bonding_info *bonding_info)
8071 struct netdev_notifier_bonding_info info = {
8075 memcpy(&info.bonding_info, bonding_info,
8076 sizeof(struct netdev_bonding_info));
8077 call_netdevice_notifiers_info(NETDEV_BONDING_INFO,
8080 EXPORT_SYMBOL(netdev_bonding_info_change);
8083 * netdev_get_xmit_slave - Get the xmit slave of master device
8086 * @all_slaves: assume all the slaves are active
8088 * The reference counters are not incremented so the caller must be
8089 * careful with locks. The caller must hold RCU lock.
8090 * %NULL is returned if no slave is found.
8093 struct net_device *netdev_get_xmit_slave(struct net_device *dev,
8094 struct sk_buff *skb,
8097 const struct net_device_ops *ops = dev->netdev_ops;
8099 if (!ops->ndo_get_xmit_slave)
8101 return ops->ndo_get_xmit_slave(dev, skb, all_slaves);
8103 EXPORT_SYMBOL(netdev_get_xmit_slave);
8105 static void netdev_adjacent_add_links(struct net_device *dev)
8107 struct netdev_adjacent *iter;
8109 struct net *net = dev_net(dev);
8111 list_for_each_entry(iter, &dev->adj_list.upper, list) {
8112 if (!net_eq(net, dev_net(iter->dev)))
8114 netdev_adjacent_sysfs_add(iter->dev, dev,
8115 &iter->dev->adj_list.lower);
8116 netdev_adjacent_sysfs_add(dev, iter->dev,
8117 &dev->adj_list.upper);
8120 list_for_each_entry(iter, &dev->adj_list.lower, list) {
8121 if (!net_eq(net, dev_net(iter->dev)))
8123 netdev_adjacent_sysfs_add(iter->dev, dev,
8124 &iter->dev->adj_list.upper);
8125 netdev_adjacent_sysfs_add(dev, iter->dev,
8126 &dev->adj_list.lower);
8130 static void netdev_adjacent_del_links(struct net_device *dev)
8132 struct netdev_adjacent *iter;
8134 struct net *net = dev_net(dev);
8136 list_for_each_entry(iter, &dev->adj_list.upper, list) {
8137 if (!net_eq(net, dev_net(iter->dev)))
8139 netdev_adjacent_sysfs_del(iter->dev, dev->name,
8140 &iter->dev->adj_list.lower);
8141 netdev_adjacent_sysfs_del(dev, iter->dev->name,
8142 &dev->adj_list.upper);
8145 list_for_each_entry(iter, &dev->adj_list.lower, list) {
8146 if (!net_eq(net, dev_net(iter->dev)))
8148 netdev_adjacent_sysfs_del(iter->dev, dev->name,
8149 &iter->dev->adj_list.upper);
8150 netdev_adjacent_sysfs_del(dev, iter->dev->name,
8151 &dev->adj_list.lower);
8155 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname)
8157 struct netdev_adjacent *iter;
8159 struct net *net = dev_net(dev);
8161 list_for_each_entry(iter, &dev->adj_list.upper, list) {
8162 if (!net_eq(net, dev_net(iter->dev)))
8164 netdev_adjacent_sysfs_del(iter->dev, oldname,
8165 &iter->dev->adj_list.lower);
8166 netdev_adjacent_sysfs_add(iter->dev, dev,
8167 &iter->dev->adj_list.lower);
8170 list_for_each_entry(iter, &dev->adj_list.lower, list) {
8171 if (!net_eq(net, dev_net(iter->dev)))
8173 netdev_adjacent_sysfs_del(iter->dev, oldname,
8174 &iter->dev->adj_list.upper);
8175 netdev_adjacent_sysfs_add(iter->dev, dev,
8176 &iter->dev->adj_list.upper);
8180 void *netdev_lower_dev_get_private(struct net_device *dev,
8181 struct net_device *lower_dev)
8183 struct netdev_adjacent *lower;
8187 lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower);
8191 return lower->private;
8193 EXPORT_SYMBOL(netdev_lower_dev_get_private);
8197 * netdev_lower_state_changed - Dispatch event about lower device state change
8198 * @lower_dev: device
8199 * @lower_state_info: state to dispatch
8201 * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info.
8202 * The caller must hold the RTNL lock.
8204 void netdev_lower_state_changed(struct net_device *lower_dev,
8205 void *lower_state_info)
8207 struct netdev_notifier_changelowerstate_info changelowerstate_info = {
8208 .info.dev = lower_dev,
8212 changelowerstate_info.lower_state_info = lower_state_info;
8213 call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE,
8214 &changelowerstate_info.info);
8216 EXPORT_SYMBOL(netdev_lower_state_changed);
8218 static void dev_change_rx_flags(struct net_device *dev, int flags)
8220 const struct net_device_ops *ops = dev->netdev_ops;
8222 if (ops->ndo_change_rx_flags)
8223 ops->ndo_change_rx_flags(dev, flags);
8226 static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify)
8228 unsigned int old_flags = dev->flags;
8234 dev->flags |= IFF_PROMISC;
8235 dev->promiscuity += inc;
8236 if (dev->promiscuity == 0) {
8239 * If inc causes overflow, untouch promisc and return error.
8242 dev->flags &= ~IFF_PROMISC;
8244 dev->promiscuity -= inc;
8245 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
8250 if (dev->flags != old_flags) {
8251 pr_info("device %s %s promiscuous mode\n",
8253 dev->flags & IFF_PROMISC ? "entered" : "left");
8254 if (audit_enabled) {
8255 current_uid_gid(&uid, &gid);
8256 audit_log(audit_context(), GFP_ATOMIC,
8257 AUDIT_ANOM_PROMISCUOUS,
8258 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
8259 dev->name, (dev->flags & IFF_PROMISC),
8260 (old_flags & IFF_PROMISC),
8261 from_kuid(&init_user_ns, audit_get_loginuid(current)),
8262 from_kuid(&init_user_ns, uid),
8263 from_kgid(&init_user_ns, gid),
8264 audit_get_sessionid(current));
8267 dev_change_rx_flags(dev, IFF_PROMISC);
8270 __dev_notify_flags(dev, old_flags, IFF_PROMISC);
8275 * dev_set_promiscuity - update promiscuity count on a device
8279 * Add or remove promiscuity from a device. While the count in the device
8280 * remains above zero the interface remains promiscuous. Once it hits zero
8281 * the device reverts back to normal filtering operation. A negative inc
8282 * value is used to drop promiscuity on the device.
8283 * Return 0 if successful or a negative errno code on error.
8285 int dev_set_promiscuity(struct net_device *dev, int inc)
8287 unsigned int old_flags = dev->flags;
8290 err = __dev_set_promiscuity(dev, inc, true);
8293 if (dev->flags != old_flags)
8294 dev_set_rx_mode(dev);
8297 EXPORT_SYMBOL(dev_set_promiscuity);
8299 static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify)
8301 unsigned int old_flags = dev->flags, old_gflags = dev->gflags;
8305 dev->flags |= IFF_ALLMULTI;
8306 dev->allmulti += inc;
8307 if (dev->allmulti == 0) {
8310 * If inc causes overflow, untouch allmulti and return error.
8313 dev->flags &= ~IFF_ALLMULTI;
8315 dev->allmulti -= inc;
8316 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
8321 if (dev->flags ^ old_flags) {
8322 dev_change_rx_flags(dev, IFF_ALLMULTI);
8323 dev_set_rx_mode(dev);
8325 __dev_notify_flags(dev, old_flags,
8326 dev->gflags ^ old_gflags);
8332 * dev_set_allmulti - update allmulti count on a device
8336 * Add or remove reception of all multicast frames to a device. While the
8337 * count in the device remains above zero the interface remains listening
8338 * to all interfaces. Once it hits zero the device reverts back to normal
8339 * filtering operation. A negative @inc value is used to drop the counter
8340 * when releasing a resource needing all multicasts.
8341 * Return 0 if successful or a negative errno code on error.
8344 int dev_set_allmulti(struct net_device *dev, int inc)
8346 return __dev_set_allmulti(dev, inc, true);
8348 EXPORT_SYMBOL(dev_set_allmulti);
8351 * Upload unicast and multicast address lists to device and
8352 * configure RX filtering. When the device doesn't support unicast
8353 * filtering it is put in promiscuous mode while unicast addresses
8356 void __dev_set_rx_mode(struct net_device *dev)
8358 const struct net_device_ops *ops = dev->netdev_ops;
8360 /* dev_open will call this function so the list will stay sane. */
8361 if (!(dev->flags&IFF_UP))
8364 if (!netif_device_present(dev))
8367 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
8368 /* Unicast addresses changes may only happen under the rtnl,
8369 * therefore calling __dev_set_promiscuity here is safe.
8371 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
8372 __dev_set_promiscuity(dev, 1, false);
8373 dev->uc_promisc = true;
8374 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
8375 __dev_set_promiscuity(dev, -1, false);
8376 dev->uc_promisc = false;
8380 if (ops->ndo_set_rx_mode)
8381 ops->ndo_set_rx_mode(dev);
8384 void dev_set_rx_mode(struct net_device *dev)
8386 netif_addr_lock_bh(dev);
8387 __dev_set_rx_mode(dev);
8388 netif_addr_unlock_bh(dev);
8392 * dev_get_flags - get flags reported to userspace
8395 * Get the combination of flag bits exported through APIs to userspace.
8397 unsigned int dev_get_flags(const struct net_device *dev)
8401 flags = (dev->flags & ~(IFF_PROMISC |
8406 (dev->gflags & (IFF_PROMISC |
8409 if (netif_running(dev)) {
8410 if (netif_oper_up(dev))
8411 flags |= IFF_RUNNING;
8412 if (netif_carrier_ok(dev))
8413 flags |= IFF_LOWER_UP;
8414 if (netif_dormant(dev))
8415 flags |= IFF_DORMANT;
8420 EXPORT_SYMBOL(dev_get_flags);
8422 int __dev_change_flags(struct net_device *dev, unsigned int flags,
8423 struct netlink_ext_ack *extack)
8425 unsigned int old_flags = dev->flags;
8431 * Set the flags on our device.
8434 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
8435 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
8437 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
8441 * Load in the correct multicast list now the flags have changed.
8444 if ((old_flags ^ flags) & IFF_MULTICAST)
8445 dev_change_rx_flags(dev, IFF_MULTICAST);
8447 dev_set_rx_mode(dev);
8450 * Have we downed the interface. We handle IFF_UP ourselves
8451 * according to user attempts to set it, rather than blindly
8456 if ((old_flags ^ flags) & IFF_UP) {
8457 if (old_flags & IFF_UP)
8460 ret = __dev_open(dev, extack);
8463 if ((flags ^ dev->gflags) & IFF_PROMISC) {
8464 int inc = (flags & IFF_PROMISC) ? 1 : -1;
8465 unsigned int old_flags = dev->flags;
8467 dev->gflags ^= IFF_PROMISC;
8469 if (__dev_set_promiscuity(dev, inc, false) >= 0)
8470 if (dev->flags != old_flags)
8471 dev_set_rx_mode(dev);
8474 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
8475 * is important. Some (broken) drivers set IFF_PROMISC, when
8476 * IFF_ALLMULTI is requested not asking us and not reporting.
8478 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
8479 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
8481 dev->gflags ^= IFF_ALLMULTI;
8482 __dev_set_allmulti(dev, inc, false);
8488 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
8489 unsigned int gchanges)
8491 unsigned int changes = dev->flags ^ old_flags;
8494 rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC);
8496 if (changes & IFF_UP) {
8497 if (dev->flags & IFF_UP)
8498 call_netdevice_notifiers(NETDEV_UP, dev);
8500 call_netdevice_notifiers(NETDEV_DOWN, dev);
8503 if (dev->flags & IFF_UP &&
8504 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) {
8505 struct netdev_notifier_change_info change_info = {
8509 .flags_changed = changes,
8512 call_netdevice_notifiers_info(NETDEV_CHANGE, &change_info.info);
8517 * dev_change_flags - change device settings
8519 * @flags: device state flags
8520 * @extack: netlink extended ack
8522 * Change settings on device based state flags. The flags are
8523 * in the userspace exported format.
8525 int dev_change_flags(struct net_device *dev, unsigned int flags,
8526 struct netlink_ext_ack *extack)
8529 unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;
8531 ret = __dev_change_flags(dev, flags, extack);
8535 changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags);
8536 __dev_notify_flags(dev, old_flags, changes);
8539 EXPORT_SYMBOL(dev_change_flags);
8541 int __dev_set_mtu(struct net_device *dev, int new_mtu)
8543 const struct net_device_ops *ops = dev->netdev_ops;
8545 if (ops->ndo_change_mtu)
8546 return ops->ndo_change_mtu(dev, new_mtu);
8548 /* Pairs with all the lockless reads of dev->mtu in the stack */
8549 WRITE_ONCE(dev->mtu, new_mtu);
8552 EXPORT_SYMBOL(__dev_set_mtu);
8554 int dev_validate_mtu(struct net_device *dev, int new_mtu,
8555 struct netlink_ext_ack *extack)
8557 /* MTU must be positive, and in range */
8558 if (new_mtu < 0 || new_mtu < dev->min_mtu) {
8559 NL_SET_ERR_MSG(extack, "mtu less than device minimum");
8563 if (dev->max_mtu > 0 && new_mtu > dev->max_mtu) {
8564 NL_SET_ERR_MSG(extack, "mtu greater than device maximum");
8571 * dev_set_mtu_ext - Change maximum transfer unit
8573 * @new_mtu: new transfer unit
8574 * @extack: netlink extended ack
8576 * Change the maximum transfer size of the network device.
8578 int dev_set_mtu_ext(struct net_device *dev, int new_mtu,
8579 struct netlink_ext_ack *extack)
8583 if (new_mtu == dev->mtu)
8586 err = dev_validate_mtu(dev, new_mtu, extack);
8590 if (!netif_device_present(dev))
8593 err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev);
8594 err = notifier_to_errno(err);
8598 orig_mtu = dev->mtu;
8599 err = __dev_set_mtu(dev, new_mtu);
8602 err = call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev,
8604 err = notifier_to_errno(err);
8606 /* setting mtu back and notifying everyone again,
8607 * so that they have a chance to revert changes.
8609 __dev_set_mtu(dev, orig_mtu);
8610 call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev,
8617 int dev_set_mtu(struct net_device *dev, int new_mtu)
8619 struct netlink_ext_ack extack;
8622 memset(&extack, 0, sizeof(extack));
8623 err = dev_set_mtu_ext(dev, new_mtu, &extack);
8624 if (err && extack._msg)
8625 net_err_ratelimited("%s: %s\n", dev->name, extack._msg);
8628 EXPORT_SYMBOL(dev_set_mtu);
8631 * dev_change_tx_queue_len - Change TX queue length of a netdevice
8633 * @new_len: new tx queue length
8635 int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len)
8637 unsigned int orig_len = dev->tx_queue_len;
8640 if (new_len != (unsigned int)new_len)
8643 if (new_len != orig_len) {
8644 dev->tx_queue_len = new_len;
8645 res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev);
8646 res = notifier_to_errno(res);
8649 res = dev_qdisc_change_tx_queue_len(dev);
8657 netdev_err(dev, "refused to change device tx_queue_len\n");
8658 dev->tx_queue_len = orig_len;
8663 * dev_set_group - Change group this device belongs to
8665 * @new_group: group this device should belong to
8667 void dev_set_group(struct net_device *dev, int new_group)
8669 dev->group = new_group;
8671 EXPORT_SYMBOL(dev_set_group);
8674 * dev_pre_changeaddr_notify - Call NETDEV_PRE_CHANGEADDR.
8676 * @addr: new address
8677 * @extack: netlink extended ack
8679 int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr,
8680 struct netlink_ext_ack *extack)
8682 struct netdev_notifier_pre_changeaddr_info info = {
8684 .info.extack = extack,
8689 rc = call_netdevice_notifiers_info(NETDEV_PRE_CHANGEADDR, &info.info);
8690 return notifier_to_errno(rc);
8692 EXPORT_SYMBOL(dev_pre_changeaddr_notify);
8695 * dev_set_mac_address - Change Media Access Control Address
8698 * @extack: netlink extended ack
8700 * Change the hardware (MAC) address of the device
8702 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
8703 struct netlink_ext_ack *extack)
8705 const struct net_device_ops *ops = dev->netdev_ops;
8708 if (!ops->ndo_set_mac_address)
8710 if (sa->sa_family != dev->type)
8712 if (!netif_device_present(dev))
8714 err = dev_pre_changeaddr_notify(dev, sa->sa_data, extack);
8717 err = ops->ndo_set_mac_address(dev, sa);
8720 dev->addr_assign_type = NET_ADDR_SET;
8721 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
8722 add_device_randomness(dev->dev_addr, dev->addr_len);
8725 EXPORT_SYMBOL(dev_set_mac_address);
8728 * dev_change_carrier - Change device carrier
8730 * @new_carrier: new value
8732 * Change device carrier
8734 int dev_change_carrier(struct net_device *dev, bool new_carrier)
8736 const struct net_device_ops *ops = dev->netdev_ops;
8738 if (!ops->ndo_change_carrier)
8740 if (!netif_device_present(dev))
8742 return ops->ndo_change_carrier(dev, new_carrier);
8744 EXPORT_SYMBOL(dev_change_carrier);
8747 * dev_get_phys_port_id - Get device physical port ID
8751 * Get device physical port ID
8753 int dev_get_phys_port_id(struct net_device *dev,
8754 struct netdev_phys_item_id *ppid)
8756 const struct net_device_ops *ops = dev->netdev_ops;
8758 if (!ops->ndo_get_phys_port_id)
8760 return ops->ndo_get_phys_port_id(dev, ppid);
8762 EXPORT_SYMBOL(dev_get_phys_port_id);
8765 * dev_get_phys_port_name - Get device physical port name
8768 * @len: limit of bytes to copy to name
8770 * Get device physical port name
8772 int dev_get_phys_port_name(struct net_device *dev,
8773 char *name, size_t len)
8775 const struct net_device_ops *ops = dev->netdev_ops;
8778 if (ops->ndo_get_phys_port_name) {
8779 err = ops->ndo_get_phys_port_name(dev, name, len);
8780 if (err != -EOPNOTSUPP)
8783 return devlink_compat_phys_port_name_get(dev, name, len);
8785 EXPORT_SYMBOL(dev_get_phys_port_name);
8788 * dev_get_port_parent_id - Get the device's port parent identifier
8789 * @dev: network device
8790 * @ppid: pointer to a storage for the port's parent identifier
8791 * @recurse: allow/disallow recursion to lower devices
8793 * Get the devices's port parent identifier
8795 int dev_get_port_parent_id(struct net_device *dev,
8796 struct netdev_phys_item_id *ppid,
8799 const struct net_device_ops *ops = dev->netdev_ops;
8800 struct netdev_phys_item_id first = { };
8801 struct net_device *lower_dev;
8802 struct list_head *iter;
8805 if (ops->ndo_get_port_parent_id) {
8806 err = ops->ndo_get_port_parent_id(dev, ppid);
8807 if (err != -EOPNOTSUPP)
8811 err = devlink_compat_switch_id_get(dev, ppid);
8812 if (!err || err != -EOPNOTSUPP)
8818 netdev_for_each_lower_dev(dev, lower_dev, iter) {
8819 err = dev_get_port_parent_id(lower_dev, ppid, recurse);
8824 else if (memcmp(&first, ppid, sizeof(*ppid)))
8830 EXPORT_SYMBOL(dev_get_port_parent_id);
8833 * netdev_port_same_parent_id - Indicate if two network devices have
8834 * the same port parent identifier
8835 * @a: first network device
8836 * @b: second network device
8838 bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b)
8840 struct netdev_phys_item_id a_id = { };
8841 struct netdev_phys_item_id b_id = { };
8843 if (dev_get_port_parent_id(a, &a_id, true) ||
8844 dev_get_port_parent_id(b, &b_id, true))
8847 return netdev_phys_item_id_same(&a_id, &b_id);
8849 EXPORT_SYMBOL(netdev_port_same_parent_id);
8852 * dev_change_proto_down - update protocol port state information
8854 * @proto_down: new value
8856 * This info can be used by switch drivers to set the phys state of the
8859 int dev_change_proto_down(struct net_device *dev, bool proto_down)
8861 const struct net_device_ops *ops = dev->netdev_ops;
8863 if (!ops->ndo_change_proto_down)
8865 if (!netif_device_present(dev))
8867 return ops->ndo_change_proto_down(dev, proto_down);
8869 EXPORT_SYMBOL(dev_change_proto_down);
8872 * dev_change_proto_down_generic - generic implementation for
8873 * ndo_change_proto_down that sets carrier according to
8877 * @proto_down: new value
8879 int dev_change_proto_down_generic(struct net_device *dev, bool proto_down)
8882 netif_carrier_off(dev);
8884 netif_carrier_on(dev);
8885 dev->proto_down = proto_down;
8888 EXPORT_SYMBOL(dev_change_proto_down_generic);
8891 * dev_change_proto_down_reason - proto down reason
8894 * @mask: proto down mask
8895 * @value: proto down value
8897 void dev_change_proto_down_reason(struct net_device *dev, unsigned long mask,
8903 dev->proto_down_reason = value;
8905 for_each_set_bit(b, &mask, 32) {
8906 if (value & (1 << b))
8907 dev->proto_down_reason |= BIT(b);
8909 dev->proto_down_reason &= ~BIT(b);
8913 EXPORT_SYMBOL(dev_change_proto_down_reason);
8915 struct bpf_xdp_link {
8916 struct bpf_link link;
8917 struct net_device *dev; /* protected by rtnl_lock, no refcnt held */
8921 static enum bpf_xdp_mode dev_xdp_mode(struct net_device *dev, u32 flags)
8923 if (flags & XDP_FLAGS_HW_MODE)
8925 if (flags & XDP_FLAGS_DRV_MODE)
8926 return XDP_MODE_DRV;
8927 if (flags & XDP_FLAGS_SKB_MODE)
8928 return XDP_MODE_SKB;
8929 return dev->netdev_ops->ndo_bpf ? XDP_MODE_DRV : XDP_MODE_SKB;
8932 static bpf_op_t dev_xdp_bpf_op(struct net_device *dev, enum bpf_xdp_mode mode)
8936 return generic_xdp_install;
8939 return dev->netdev_ops->ndo_bpf;
8945 static struct bpf_xdp_link *dev_xdp_link(struct net_device *dev,
8946 enum bpf_xdp_mode mode)
8948 return dev->xdp_state[mode].link;
8951 static struct bpf_prog *dev_xdp_prog(struct net_device *dev,
8952 enum bpf_xdp_mode mode)
8954 struct bpf_xdp_link *link = dev_xdp_link(dev, mode);
8957 return link->link.prog;
8958 return dev->xdp_state[mode].prog;
8961 static u8 dev_xdp_prog_count(struct net_device *dev)
8966 for (i = 0; i < __MAX_XDP_MODE; i++)
8967 if (dev->xdp_state[i].prog || dev->xdp_state[i].link)
8972 u32 dev_xdp_prog_id(struct net_device *dev, enum bpf_xdp_mode mode)
8974 struct bpf_prog *prog = dev_xdp_prog(dev, mode);
8976 return prog ? prog->aux->id : 0;
8979 static void dev_xdp_set_link(struct net_device *dev, enum bpf_xdp_mode mode,
8980 struct bpf_xdp_link *link)
8982 dev->xdp_state[mode].link = link;
8983 dev->xdp_state[mode].prog = NULL;
8986 static void dev_xdp_set_prog(struct net_device *dev, enum bpf_xdp_mode mode,
8987 struct bpf_prog *prog)
8989 dev->xdp_state[mode].link = NULL;
8990 dev->xdp_state[mode].prog = prog;
8993 static int dev_xdp_install(struct net_device *dev, enum bpf_xdp_mode mode,
8994 bpf_op_t bpf_op, struct netlink_ext_ack *extack,
8995 u32 flags, struct bpf_prog *prog)
8997 struct netdev_bpf xdp;
9000 memset(&xdp, 0, sizeof(xdp));
9001 xdp.command = mode == XDP_MODE_HW ? XDP_SETUP_PROG_HW : XDP_SETUP_PROG;
9002 xdp.extack = extack;
9006 /* Drivers assume refcnt is already incremented (i.e, prog pointer is
9007 * "moved" into driver), so they don't increment it on their own, but
9008 * they do decrement refcnt when program is detached or replaced.
9009 * Given net_device also owns link/prog, we need to bump refcnt here
9010 * to prevent drivers from underflowing it.
9014 err = bpf_op(dev, &xdp);
9021 if (mode != XDP_MODE_HW)
9022 bpf_prog_change_xdp(dev_xdp_prog(dev, mode), prog);
9027 static void dev_xdp_uninstall(struct net_device *dev)
9029 struct bpf_xdp_link *link;
9030 struct bpf_prog *prog;
9031 enum bpf_xdp_mode mode;
9036 for (mode = XDP_MODE_SKB; mode < __MAX_XDP_MODE; mode++) {
9037 prog = dev_xdp_prog(dev, mode);
9041 bpf_op = dev_xdp_bpf_op(dev, mode);
9045 WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL));
9047 /* auto-detach link from net device */
9048 link = dev_xdp_link(dev, mode);
9054 dev_xdp_set_link(dev, mode, NULL);
9058 static int dev_xdp_attach(struct net_device *dev, struct netlink_ext_ack *extack,
9059 struct bpf_xdp_link *link, struct bpf_prog *new_prog,
9060 struct bpf_prog *old_prog, u32 flags)
9062 unsigned int num_modes = hweight32(flags & XDP_FLAGS_MODES);
9063 struct bpf_prog *cur_prog;
9064 enum bpf_xdp_mode mode;
9070 /* either link or prog attachment, never both */
9071 if (link && (new_prog || old_prog))
9073 /* link supports only XDP mode flags */
9074 if (link && (flags & ~XDP_FLAGS_MODES)) {
9075 NL_SET_ERR_MSG(extack, "Invalid XDP flags for BPF link attachment");
9078 /* just one XDP mode bit should be set, zero defaults to drv/skb mode */
9079 if (num_modes > 1) {
9080 NL_SET_ERR_MSG(extack, "Only one XDP mode flag can be set");
9083 /* avoid ambiguity if offload + drv/skb mode progs are both loaded */
9084 if (!num_modes && dev_xdp_prog_count(dev) > 1) {
9085 NL_SET_ERR_MSG(extack,
9086 "More than one program loaded, unset mode is ambiguous");
9089 /* old_prog != NULL implies XDP_FLAGS_REPLACE is set */
9090 if (old_prog && !(flags & XDP_FLAGS_REPLACE)) {
9091 NL_SET_ERR_MSG(extack, "XDP_FLAGS_REPLACE is not specified");
9095 mode = dev_xdp_mode(dev, flags);
9096 /* can't replace attached link */
9097 if (dev_xdp_link(dev, mode)) {
9098 NL_SET_ERR_MSG(extack, "Can't replace active BPF XDP link");
9102 cur_prog = dev_xdp_prog(dev, mode);
9103 /* can't replace attached prog with link */
9104 if (link && cur_prog) {
9105 NL_SET_ERR_MSG(extack, "Can't replace active XDP program with BPF link");
9108 if ((flags & XDP_FLAGS_REPLACE) && cur_prog != old_prog) {
9109 NL_SET_ERR_MSG(extack, "Active program does not match expected");
9113 /* put effective new program into new_prog */
9115 new_prog = link->link.prog;
9118 bool offload = mode == XDP_MODE_HW;
9119 enum bpf_xdp_mode other_mode = mode == XDP_MODE_SKB
9120 ? XDP_MODE_DRV : XDP_MODE_SKB;
9122 if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) && cur_prog) {
9123 NL_SET_ERR_MSG(extack, "XDP program already attached");
9126 if (!offload && dev_xdp_prog(dev, other_mode)) {
9127 NL_SET_ERR_MSG(extack, "Native and generic XDP can't be active at the same time");
9130 if (!offload && bpf_prog_is_dev_bound(new_prog->aux)) {
9131 NL_SET_ERR_MSG(extack, "Using device-bound program without HW_MODE flag is not supported");
9134 if (new_prog->expected_attach_type == BPF_XDP_DEVMAP) {
9135 NL_SET_ERR_MSG(extack, "BPF_XDP_DEVMAP programs can not be attached to a device");
9138 if (new_prog->expected_attach_type == BPF_XDP_CPUMAP) {
9139 NL_SET_ERR_MSG(extack, "BPF_XDP_CPUMAP programs can not be attached to a device");
9144 /* don't call drivers if the effective program didn't change */
9145 if (new_prog != cur_prog) {
9146 bpf_op = dev_xdp_bpf_op(dev, mode);
9148 NL_SET_ERR_MSG(extack, "Underlying driver does not support XDP in native mode");
9152 err = dev_xdp_install(dev, mode, bpf_op, extack, flags, new_prog);
9158 dev_xdp_set_link(dev, mode, link);
9160 dev_xdp_set_prog(dev, mode, new_prog);
9162 bpf_prog_put(cur_prog);
9167 static int dev_xdp_attach_link(struct net_device *dev,
9168 struct netlink_ext_ack *extack,
9169 struct bpf_xdp_link *link)
9171 return dev_xdp_attach(dev, extack, link, NULL, NULL, link->flags);
9174 static int dev_xdp_detach_link(struct net_device *dev,
9175 struct netlink_ext_ack *extack,
9176 struct bpf_xdp_link *link)
9178 enum bpf_xdp_mode mode;
9183 mode = dev_xdp_mode(dev, link->flags);
9184 if (dev_xdp_link(dev, mode) != link)
9187 bpf_op = dev_xdp_bpf_op(dev, mode);
9188 WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL));
9189 dev_xdp_set_link(dev, mode, NULL);
9193 static void bpf_xdp_link_release(struct bpf_link *link)
9195 struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
9199 /* if racing with net_device's tear down, xdp_link->dev might be
9200 * already NULL, in which case link was already auto-detached
9202 if (xdp_link->dev) {
9203 WARN_ON(dev_xdp_detach_link(xdp_link->dev, NULL, xdp_link));
9204 xdp_link->dev = NULL;
9210 static int bpf_xdp_link_detach(struct bpf_link *link)
9212 bpf_xdp_link_release(link);
9216 static void bpf_xdp_link_dealloc(struct bpf_link *link)
9218 struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
9223 static void bpf_xdp_link_show_fdinfo(const struct bpf_link *link,
9224 struct seq_file *seq)
9226 struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
9231 ifindex = xdp_link->dev->ifindex;
9234 seq_printf(seq, "ifindex:\t%u\n", ifindex);
9237 static int bpf_xdp_link_fill_link_info(const struct bpf_link *link,
9238 struct bpf_link_info *info)
9240 struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
9245 ifindex = xdp_link->dev->ifindex;
9248 info->xdp.ifindex = ifindex;
9252 static int bpf_xdp_link_update(struct bpf_link *link, struct bpf_prog *new_prog,
9253 struct bpf_prog *old_prog)
9255 struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link);
9256 enum bpf_xdp_mode mode;
9262 /* link might have been auto-released already, so fail */
9263 if (!xdp_link->dev) {
9268 if (old_prog && link->prog != old_prog) {
9272 old_prog = link->prog;
9273 if (old_prog == new_prog) {
9274 /* no-op, don't disturb drivers */
9275 bpf_prog_put(new_prog);
9279 mode = dev_xdp_mode(xdp_link->dev, xdp_link->flags);
9280 bpf_op = dev_xdp_bpf_op(xdp_link->dev, mode);
9281 err = dev_xdp_install(xdp_link->dev, mode, bpf_op, NULL,
9282 xdp_link->flags, new_prog);
9286 old_prog = xchg(&link->prog, new_prog);
9287 bpf_prog_put(old_prog);
9294 static const struct bpf_link_ops bpf_xdp_link_lops = {
9295 .release = bpf_xdp_link_release,
9296 .dealloc = bpf_xdp_link_dealloc,
9297 .detach = bpf_xdp_link_detach,
9298 .show_fdinfo = bpf_xdp_link_show_fdinfo,
9299 .fill_link_info = bpf_xdp_link_fill_link_info,
9300 .update_prog = bpf_xdp_link_update,
9303 int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
9305 struct net *net = current->nsproxy->net_ns;
9306 struct bpf_link_primer link_primer;
9307 struct bpf_xdp_link *link;
9308 struct net_device *dev;
9311 dev = dev_get_by_index(net, attr->link_create.target_ifindex);
9315 link = kzalloc(sizeof(*link), GFP_USER);
9321 bpf_link_init(&link->link, BPF_LINK_TYPE_XDP, &bpf_xdp_link_lops, prog);
9323 link->flags = attr->link_create.flags;
9325 err = bpf_link_prime(&link->link, &link_primer);
9332 err = dev_xdp_attach_link(dev, NULL, link);
9336 bpf_link_cleanup(&link_primer);
9340 fd = bpf_link_settle(&link_primer);
9341 /* link itself doesn't hold dev's refcnt to not complicate shutdown */
9351 * dev_change_xdp_fd - set or clear a bpf program for a device rx path
9353 * @extack: netlink extended ack
9354 * @fd: new program fd or negative value to clear
9355 * @expected_fd: old program fd that userspace expects to replace or clear
9356 * @flags: xdp-related flags
9358 * Set or clear a bpf program for a device
9360 int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
9361 int fd, int expected_fd, u32 flags)
9363 enum bpf_xdp_mode mode = dev_xdp_mode(dev, flags);
9364 struct bpf_prog *new_prog = NULL, *old_prog = NULL;
9370 new_prog = bpf_prog_get_type_dev(fd, BPF_PROG_TYPE_XDP,
9371 mode != XDP_MODE_SKB);
9372 if (IS_ERR(new_prog))
9373 return PTR_ERR(new_prog);
9376 if (expected_fd >= 0) {
9377 old_prog = bpf_prog_get_type_dev(expected_fd, BPF_PROG_TYPE_XDP,
9378 mode != XDP_MODE_SKB);
9379 if (IS_ERR(old_prog)) {
9380 err = PTR_ERR(old_prog);
9386 err = dev_xdp_attach(dev, extack, NULL, new_prog, old_prog, flags);
9389 if (err && new_prog)
9390 bpf_prog_put(new_prog);
9392 bpf_prog_put(old_prog);
9397 * dev_new_index - allocate an ifindex
9398 * @net: the applicable net namespace
9400 * Returns a suitable unique value for a new device interface
9401 * number. The caller must hold the rtnl semaphore or the
9402 * dev_base_lock to be sure it remains unique.
9404 static int dev_new_index(struct net *net)
9406 int ifindex = net->ifindex;
9411 if (!__dev_get_by_index(net, ifindex))
9412 return net->ifindex = ifindex;
9416 /* Delayed registration/unregisteration */
9417 static LIST_HEAD(net_todo_list);
9418 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq);
9420 static void net_set_todo(struct net_device *dev)
9422 list_add_tail(&dev->todo_list, &net_todo_list);
9423 dev_net(dev)->dev_unreg_count++;
9426 static void rollback_registered_many(struct list_head *head)
9428 struct net_device *dev, *tmp;
9429 LIST_HEAD(close_head);
9431 BUG_ON(dev_boot_phase);
9434 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
9435 /* Some devices call without registering
9436 * for initialization unwind. Remove those
9437 * devices and proceed with the remaining.
9439 if (dev->reg_state == NETREG_UNINITIALIZED) {
9440 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
9444 list_del(&dev->unreg_list);
9447 dev->dismantle = true;
9448 BUG_ON(dev->reg_state != NETREG_REGISTERED);
9451 /* If device is running, close it first. */
9452 list_for_each_entry(dev, head, unreg_list)
9453 list_add_tail(&dev->close_list, &close_head);
9454 dev_close_many(&close_head, true);
9456 list_for_each_entry(dev, head, unreg_list) {
9457 /* And unlink it from device chain. */
9458 unlist_netdevice(dev);
9460 dev->reg_state = NETREG_UNREGISTERING;
9462 flush_all_backlogs();
9466 list_for_each_entry(dev, head, unreg_list) {
9467 struct sk_buff *skb = NULL;
9469 /* Shutdown queueing discipline. */
9472 dev_xdp_uninstall(dev);
9474 /* Notify protocols, that we are about to destroy
9475 * this device. They should clean all the things.
9477 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
9479 if (!dev->rtnl_link_ops ||
9480 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
9481 skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U, 0,
9482 GFP_KERNEL, NULL, 0);
9485 * Flush the unicast and multicast chains
9490 netdev_name_node_alt_flush(dev);
9491 netdev_name_node_free(dev->name_node);
9493 if (dev->netdev_ops->ndo_uninit)
9494 dev->netdev_ops->ndo_uninit(dev);
9497 rtmsg_ifinfo_send(skb, dev, GFP_KERNEL);
9499 /* Notifier chain MUST detach us all upper devices. */
9500 WARN_ON(netdev_has_any_upper_dev(dev));
9501 WARN_ON(netdev_has_any_lower_dev(dev));
9503 /* Remove entries from kobject tree */
9504 netdev_unregister_kobject(dev);
9506 /* Remove XPS queueing entries */
9507 netif_reset_xps_queues_gt(dev, 0);
9513 list_for_each_entry(dev, head, unreg_list)
9517 static void rollback_registered(struct net_device *dev)
9521 list_add(&dev->unreg_list, &single);
9522 rollback_registered_many(&single);
9526 static netdev_features_t netdev_sync_upper_features(struct net_device *lower,
9527 struct net_device *upper, netdev_features_t features)
9529 netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
9530 netdev_features_t feature;
9533 for_each_netdev_feature(upper_disables, feature_bit) {
9534 feature = __NETIF_F_BIT(feature_bit);
9535 if (!(upper->wanted_features & feature)
9536 && (features & feature)) {
9537 netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n",
9538 &feature, upper->name);
9539 features &= ~feature;
9546 static void netdev_sync_lower_features(struct net_device *upper,
9547 struct net_device *lower, netdev_features_t features)
9549 netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
9550 netdev_features_t feature;
9553 for_each_netdev_feature(upper_disables, feature_bit) {
9554 feature = __NETIF_F_BIT(feature_bit);
9555 if (!(features & feature) && (lower->features & feature)) {
9556 netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n",
9557 &feature, lower->name);
9558 lower->wanted_features &= ~feature;
9559 __netdev_update_features(lower);
9561 if (unlikely(lower->features & feature))
9562 netdev_WARN(upper, "failed to disable %pNF on %s!\n",
9563 &feature, lower->name);
9565 netdev_features_change(lower);
9570 static netdev_features_t netdev_fix_features(struct net_device *dev,
9571 netdev_features_t features)
9573 /* Fix illegal checksum combinations */
9574 if ((features & NETIF_F_HW_CSUM) &&
9575 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
9576 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
9577 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
9580 /* TSO requires that SG is present as well. */
9581 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
9582 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
9583 features &= ~NETIF_F_ALL_TSO;
9586 if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) &&
9587 !(features & NETIF_F_IP_CSUM)) {
9588 netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n");
9589 features &= ~NETIF_F_TSO;
9590 features &= ~NETIF_F_TSO_ECN;
9593 if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) &&
9594 !(features & NETIF_F_IPV6_CSUM)) {
9595 netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n");
9596 features &= ~NETIF_F_TSO6;
9599 /* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */
9600 if ((features & NETIF_F_TSO_MANGLEID) && !(features & NETIF_F_TSO))
9601 features &= ~NETIF_F_TSO_MANGLEID;
9603 /* TSO ECN requires that TSO is present as well. */
9604 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
9605 features &= ~NETIF_F_TSO_ECN;
9607 /* Software GSO depends on SG. */
9608 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
9609 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
9610 features &= ~NETIF_F_GSO;
9613 /* GSO partial features require GSO partial be set */
9614 if ((features & dev->gso_partial_features) &&
9615 !(features & NETIF_F_GSO_PARTIAL)) {
9617 "Dropping partially supported GSO features since no GSO partial.\n");
9618 features &= ~dev->gso_partial_features;
9621 if (!(features & NETIF_F_RXCSUM)) {
9622 /* NETIF_F_GRO_HW implies doing RXCSUM since every packet
9623 * successfully merged by hardware must also have the
9624 * checksum verified by hardware. If the user does not
9625 * want to enable RXCSUM, logically, we should disable GRO_HW.
9627 if (features & NETIF_F_GRO_HW) {
9628 netdev_dbg(dev, "Dropping NETIF_F_GRO_HW since no RXCSUM feature.\n");
9629 features &= ~NETIF_F_GRO_HW;
9633 /* LRO/HW-GRO features cannot be combined with RX-FCS */
9634 if (features & NETIF_F_RXFCS) {
9635 if (features & NETIF_F_LRO) {
9636 netdev_dbg(dev, "Dropping LRO feature since RX-FCS is requested.\n");
9637 features &= ~NETIF_F_LRO;
9640 if (features & NETIF_F_GRO_HW) {
9641 netdev_dbg(dev, "Dropping HW-GRO feature since RX-FCS is requested.\n");
9642 features &= ~NETIF_F_GRO_HW;
9646 if ((features & NETIF_F_HW_TLS_TX) && !(features & NETIF_F_HW_CSUM)) {
9647 netdev_dbg(dev, "Dropping TLS TX HW offload feature since no CSUM feature.\n");
9648 features &= ~NETIF_F_HW_TLS_TX;
9654 int __netdev_update_features(struct net_device *dev)
9656 struct net_device *upper, *lower;
9657 netdev_features_t features;
9658 struct list_head *iter;
9663 features = netdev_get_wanted_features(dev);
9665 if (dev->netdev_ops->ndo_fix_features)
9666 features = dev->netdev_ops->ndo_fix_features(dev, features);
9668 /* driver might be less strict about feature dependencies */
9669 features = netdev_fix_features(dev, features);
9671 /* some features can't be enabled if they're off on an upper device */
9672 netdev_for_each_upper_dev_rcu(dev, upper, iter)
9673 features = netdev_sync_upper_features(dev, upper, features);
9675 if (dev->features == features)
9678 netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
9679 &dev->features, &features);
9681 if (dev->netdev_ops->ndo_set_features)
9682 err = dev->netdev_ops->ndo_set_features(dev, features);
9686 if (unlikely(err < 0)) {
9688 "set_features() failed (%d); wanted %pNF, left %pNF\n",
9689 err, &features, &dev->features);
9690 /* return non-0 since some features might have changed and
9691 * it's better to fire a spurious notification than miss it
9697 /* some features must be disabled on lower devices when disabled
9698 * on an upper device (think: bonding master or bridge)
9700 netdev_for_each_lower_dev(dev, lower, iter)
9701 netdev_sync_lower_features(dev, lower, features);
9704 netdev_features_t diff = features ^ dev->features;
9706 if (diff & NETIF_F_RX_UDP_TUNNEL_PORT) {
9707 /* udp_tunnel_{get,drop}_rx_info both need
9708 * NETIF_F_RX_UDP_TUNNEL_PORT enabled on the
9709 * device, or they won't do anything.
9710 * Thus we need to update dev->features
9711 * *before* calling udp_tunnel_get_rx_info,
9712 * but *after* calling udp_tunnel_drop_rx_info.
9714 if (features & NETIF_F_RX_UDP_TUNNEL_PORT) {
9715 dev->features = features;
9716 udp_tunnel_get_rx_info(dev);
9718 udp_tunnel_drop_rx_info(dev);
9722 if (diff & NETIF_F_HW_VLAN_CTAG_FILTER) {
9723 if (features & NETIF_F_HW_VLAN_CTAG_FILTER) {
9724 dev->features = features;
9725 err |= vlan_get_rx_ctag_filter_info(dev);
9727 vlan_drop_rx_ctag_filter_info(dev);
9731 if (diff & NETIF_F_HW_VLAN_STAG_FILTER) {
9732 if (features & NETIF_F_HW_VLAN_STAG_FILTER) {
9733 dev->features = features;
9734 err |= vlan_get_rx_stag_filter_info(dev);
9736 vlan_drop_rx_stag_filter_info(dev);
9740 dev->features = features;
9743 return err < 0 ? 0 : 1;
9747 * netdev_update_features - recalculate device features
9748 * @dev: the device to check
9750 * Recalculate dev->features set and send notifications if it
9751 * has changed. Should be called after driver or hardware dependent
9752 * conditions might have changed that influence the features.
9754 void netdev_update_features(struct net_device *dev)
9756 if (__netdev_update_features(dev))
9757 netdev_features_change(dev);
9759 EXPORT_SYMBOL(netdev_update_features);
9762 * netdev_change_features - recalculate device features
9763 * @dev: the device to check
9765 * Recalculate dev->features set and send notifications even
9766 * if they have not changed. Should be called instead of
9767 * netdev_update_features() if also dev->vlan_features might
9768 * have changed to allow the changes to be propagated to stacked
9771 void netdev_change_features(struct net_device *dev)
9773 __netdev_update_features(dev);
9774 netdev_features_change(dev);
9776 EXPORT_SYMBOL(netdev_change_features);
9779 * netif_stacked_transfer_operstate - transfer operstate
9780 * @rootdev: the root or lower level device to transfer state from
9781 * @dev: the device to transfer operstate to
9783 * Transfer operational state from root to device. This is normally
9784 * called when a stacking relationship exists between the root
9785 * device and the device(a leaf device).
9787 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
9788 struct net_device *dev)
9790 if (rootdev->operstate == IF_OPER_DORMANT)
9791 netif_dormant_on(dev);
9793 netif_dormant_off(dev);
9795 if (rootdev->operstate == IF_OPER_TESTING)
9796 netif_testing_on(dev);
9798 netif_testing_off(dev);
9800 if (netif_carrier_ok(rootdev))
9801 netif_carrier_on(dev);
9803 netif_carrier_off(dev);
9805 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
9807 static int netif_alloc_rx_queues(struct net_device *dev)
9809 unsigned int i, count = dev->num_rx_queues;
9810 struct netdev_rx_queue *rx;
9811 size_t sz = count * sizeof(*rx);
9816 rx = kvzalloc(sz, GFP_KERNEL | __GFP_RETRY_MAYFAIL);
9822 for (i = 0; i < count; i++) {
9825 /* XDP RX-queue setup */
9826 err = xdp_rxq_info_reg(&rx[i].xdp_rxq, dev, i, 0);
9833 /* Rollback successful reg's and free other resources */
9835 xdp_rxq_info_unreg(&rx[i].xdp_rxq);
9841 static void netif_free_rx_queues(struct net_device *dev)
9843 unsigned int i, count = dev->num_rx_queues;
9845 /* netif_alloc_rx_queues alloc failed, resources have been unreg'ed */
9849 for (i = 0; i < count; i++)
9850 xdp_rxq_info_unreg(&dev->_rx[i].xdp_rxq);
9855 static void netdev_init_one_queue(struct net_device *dev,
9856 struct netdev_queue *queue, void *_unused)
9858 /* Initialize queue lock */
9859 spin_lock_init(&queue->_xmit_lock);
9860 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
9861 queue->xmit_lock_owner = -1;
9862 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
9865 dql_init(&queue->dql, HZ);
9869 static void netif_free_tx_queues(struct net_device *dev)
9874 static int netif_alloc_netdev_queues(struct net_device *dev)
9876 unsigned int count = dev->num_tx_queues;
9877 struct netdev_queue *tx;
9878 size_t sz = count * sizeof(*tx);
9880 if (count < 1 || count > 0xffff)
9883 tx = kvzalloc(sz, GFP_KERNEL | __GFP_RETRY_MAYFAIL);
9889 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
9890 spin_lock_init(&dev->tx_global_lock);
9895 void netif_tx_stop_all_queues(struct net_device *dev)
9899 for (i = 0; i < dev->num_tx_queues; i++) {
9900 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
9902 netif_tx_stop_queue(txq);
9905 EXPORT_SYMBOL(netif_tx_stop_all_queues);
9908 * register_netdevice - register a network device
9909 * @dev: device to register
9911 * Take a completed network device structure and add it to the kernel
9912 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
9913 * chain. 0 is returned on success. A negative errno code is returned
9914 * on a failure to set up the device, or if the name is a duplicate.
9916 * Callers must hold the rtnl semaphore. You may want
9917 * register_netdev() instead of this.
9920 * The locking appears insufficient to guarantee two parallel registers
9921 * will not get the same name.
9924 int register_netdevice(struct net_device *dev)
9927 struct net *net = dev_net(dev);
9929 BUILD_BUG_ON(sizeof(netdev_features_t) * BITS_PER_BYTE <
9930 NETDEV_FEATURE_COUNT);
9931 BUG_ON(dev_boot_phase);
9936 /* When net_device's are persistent, this will be fatal. */
9937 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
9940 ret = ethtool_check_ops(dev->ethtool_ops);
9944 spin_lock_init(&dev->addr_list_lock);
9945 netdev_set_addr_lockdep_class(dev);
9947 ret = dev_get_valid_name(net, dev, dev->name);
9952 dev->name_node = netdev_name_node_head_alloc(dev);
9953 if (!dev->name_node)
9956 /* Init, if this function is available */
9957 if (dev->netdev_ops->ndo_init) {
9958 ret = dev->netdev_ops->ndo_init(dev);
9966 if (((dev->hw_features | dev->features) &
9967 NETIF_F_HW_VLAN_CTAG_FILTER) &&
9968 (!dev->netdev_ops->ndo_vlan_rx_add_vid ||
9969 !dev->netdev_ops->ndo_vlan_rx_kill_vid)) {
9970 netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n");
9977 dev->ifindex = dev_new_index(net);
9978 else if (__dev_get_by_index(net, dev->ifindex))
9981 /* Transfer changeable features to wanted_features and enable
9982 * software offloads (GSO and GRO).
9984 dev->hw_features |= (NETIF_F_SOFT_FEATURES | NETIF_F_SOFT_FEATURES_OFF);
9985 dev->features |= NETIF_F_SOFT_FEATURES;
9987 if (dev->netdev_ops->ndo_udp_tunnel_add) {
9988 dev->features |= NETIF_F_RX_UDP_TUNNEL_PORT;
9989 dev->hw_features |= NETIF_F_RX_UDP_TUNNEL_PORT;
9992 dev->wanted_features = dev->features & dev->hw_features;
9994 if (!(dev->flags & IFF_LOOPBACK))
9995 dev->hw_features |= NETIF_F_NOCACHE_COPY;
9997 /* If IPv4 TCP segmentation offload is supported we should also
9998 * allow the device to enable segmenting the frame with the option
9999 * of ignoring a static IP ID value. This doesn't enable the
10000 * feature itself but allows the user to enable it later.
10002 if (dev->hw_features & NETIF_F_TSO)
10003 dev->hw_features |= NETIF_F_TSO_MANGLEID;
10004 if (dev->vlan_features & NETIF_F_TSO)
10005 dev->vlan_features |= NETIF_F_TSO_MANGLEID;
10006 if (dev->mpls_features & NETIF_F_TSO)
10007 dev->mpls_features |= NETIF_F_TSO_MANGLEID;
10008 if (dev->hw_enc_features & NETIF_F_TSO)
10009 dev->hw_enc_features |= NETIF_F_TSO_MANGLEID;
10011 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
10013 dev->vlan_features |= NETIF_F_HIGHDMA;
10015 /* Make NETIF_F_SG inheritable to tunnel devices.
10017 dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL;
10019 /* Make NETIF_F_SG inheritable to MPLS.
10021 dev->mpls_features |= NETIF_F_SG;
10023 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
10024 ret = notifier_to_errno(ret);
10028 ret = netdev_register_kobject(dev);
10030 dev->reg_state = NETREG_UNREGISTERED;
10033 dev->reg_state = NETREG_REGISTERED;
10035 __netdev_update_features(dev);
10038 * Default initial state at registry is that the
10039 * device is present.
10042 set_bit(__LINK_STATE_PRESENT, &dev->state);
10044 linkwatch_init_dev(dev);
10046 dev_init_scheduler(dev);
10048 list_netdevice(dev);
10049 add_device_randomness(dev->dev_addr, dev->addr_len);
10051 /* If the device has permanent device address, driver should
10052 * set dev_addr and also addr_assign_type should be set to
10053 * NET_ADDR_PERM (default value).
10055 if (dev->addr_assign_type == NET_ADDR_PERM)
10056 memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
10058 /* Notify protocols, that a new device appeared. */
10059 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
10060 ret = notifier_to_errno(ret);
10062 rollback_registered(dev);
10065 dev->reg_state = NETREG_UNREGISTERED;
10066 /* We should put the kobject that hold in
10067 * netdev_unregister_kobject(), otherwise
10068 * the net device cannot be freed when
10069 * driver calls free_netdev(), because the
10070 * kobject is being hold.
10072 kobject_put(&dev->dev.kobj);
10075 * Prevent userspace races by waiting until the network
10076 * device is fully setup before sending notifications.
10078 if (!dev->rtnl_link_ops ||
10079 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
10080 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
10086 if (dev->netdev_ops->ndo_uninit)
10087 dev->netdev_ops->ndo_uninit(dev);
10088 if (dev->priv_destructor)
10089 dev->priv_destructor(dev);
10091 netdev_name_node_free(dev->name_node);
10094 EXPORT_SYMBOL(register_netdevice);
10097 * init_dummy_netdev - init a dummy network device for NAPI
10098 * @dev: device to init
10100 * This takes a network device structure and initialize the minimum
10101 * amount of fields so it can be used to schedule NAPI polls without
10102 * registering a full blown interface. This is to be used by drivers
10103 * that need to tie several hardware interfaces to a single NAPI
10104 * poll scheduler due to HW limitations.
10106 int init_dummy_netdev(struct net_device *dev)
10108 /* Clear everything. Note we don't initialize spinlocks
10109 * are they aren't supposed to be taken by any of the
10110 * NAPI code and this dummy netdev is supposed to be
10111 * only ever used for NAPI polls
10113 memset(dev, 0, sizeof(struct net_device));
10115 /* make sure we BUG if trying to hit standard
10116 * register/unregister code path
10118 dev->reg_state = NETREG_DUMMY;
10120 /* NAPI wants this */
10121 INIT_LIST_HEAD(&dev->napi_list);
10123 /* a dummy interface is started by default */
10124 set_bit(__LINK_STATE_PRESENT, &dev->state);
10125 set_bit(__LINK_STATE_START, &dev->state);
10127 /* napi_busy_loop stats accounting wants this */
10128 dev_net_set(dev, &init_net);
10130 /* Note : We dont allocate pcpu_refcnt for dummy devices,
10131 * because users of this 'device' dont need to change
10137 EXPORT_SYMBOL_GPL(init_dummy_netdev);
10141 * register_netdev - register a network device
10142 * @dev: device to register
10144 * Take a completed network device structure and add it to the kernel
10145 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
10146 * chain. 0 is returned on success. A negative errno code is returned
10147 * on a failure to set up the device, or if the name is a duplicate.
10149 * This is a wrapper around register_netdevice that takes the rtnl semaphore
10150 * and expands the device name if you passed a format string to
10153 int register_netdev(struct net_device *dev)
10157 if (rtnl_lock_killable())
10159 err = register_netdevice(dev);
10163 EXPORT_SYMBOL(register_netdev);
10165 int netdev_refcnt_read(const struct net_device *dev)
10169 for_each_possible_cpu(i)
10170 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
10173 EXPORT_SYMBOL(netdev_refcnt_read);
10175 #define WAIT_REFS_MIN_MSECS 1
10176 #define WAIT_REFS_MAX_MSECS 250
10178 * netdev_wait_allrefs - wait until all references are gone.
10179 * @dev: target net_device
10181 * This is called when unregistering network devices.
10183 * Any protocol or device that holds a reference should register
10184 * for netdevice notification, and cleanup and put back the
10185 * reference if they receive an UNREGISTER event.
10186 * We can get stuck here if buggy protocols don't correctly
10189 static void netdev_wait_allrefs(struct net_device *dev)
10191 unsigned long rebroadcast_time, warning_time;
10192 int wait = 0, refcnt;
10194 linkwatch_forget_dev(dev);
10196 rebroadcast_time = warning_time = jiffies;
10197 refcnt = netdev_refcnt_read(dev);
10199 while (refcnt != 0) {
10200 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
10203 /* Rebroadcast unregister notification */
10204 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
10210 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
10212 /* We must not have linkwatch events
10213 * pending on unregister. If this
10214 * happens, we simply run the queue
10215 * unscheduled, resulting in a noop
10218 linkwatch_run_queue();
10223 rebroadcast_time = jiffies;
10228 wait = WAIT_REFS_MIN_MSECS;
10231 wait = min(wait << 1, WAIT_REFS_MAX_MSECS);
10234 refcnt = netdev_refcnt_read(dev);
10236 if (refcnt && time_after(jiffies, warning_time + 10 * HZ)) {
10237 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
10238 dev->name, refcnt);
10239 warning_time = jiffies;
10244 /* The sequence is:
10248 * register_netdevice(x1);
10249 * register_netdevice(x2);
10251 * unregister_netdevice(y1);
10252 * unregister_netdevice(y2);
10258 * We are invoked by rtnl_unlock().
10259 * This allows us to deal with problems:
10260 * 1) We can delete sysfs objects which invoke hotplug
10261 * without deadlocking with linkwatch via keventd.
10262 * 2) Since we run with the RTNL semaphore not held, we can sleep
10263 * safely in order to wait for the netdev refcnt to drop to zero.
10265 * We must not return until all unregister events added during
10266 * the interval the lock was held have been completed.
10268 void netdev_run_todo(void)
10270 struct list_head list;
10271 #ifdef CONFIG_LOCKDEP
10272 struct list_head unlink_list;
10274 list_replace_init(&net_unlink_list, &unlink_list);
10276 while (!list_empty(&unlink_list)) {
10277 struct net_device *dev = list_first_entry(&unlink_list,
10280 list_del_init(&dev->unlink_list);
10281 dev->nested_level = dev->lower_level - 1;
10285 /* Snapshot list, allow later requests */
10286 list_replace_init(&net_todo_list, &list);
10291 /* Wait for rcu callbacks to finish before next phase */
10292 if (!list_empty(&list))
10295 while (!list_empty(&list)) {
10296 struct net_device *dev
10297 = list_first_entry(&list, struct net_device, todo_list);
10298 list_del(&dev->todo_list);
10300 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
10301 pr_err("network todo '%s' but state %d\n",
10302 dev->name, dev->reg_state);
10307 dev->reg_state = NETREG_UNREGISTERED;
10309 netdev_wait_allrefs(dev);
10312 BUG_ON(netdev_refcnt_read(dev));
10313 BUG_ON(!list_empty(&dev->ptype_all));
10314 BUG_ON(!list_empty(&dev->ptype_specific));
10315 WARN_ON(rcu_access_pointer(dev->ip_ptr));
10316 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
10317 #if IS_ENABLED(CONFIG_DECNET)
10318 WARN_ON(dev->dn_ptr);
10320 if (dev->priv_destructor)
10321 dev->priv_destructor(dev);
10322 if (dev->needs_free_netdev)
10325 /* Report a network device has been unregistered */
10327 dev_net(dev)->dev_unreg_count--;
10329 wake_up(&netdev_unregistering_wq);
10331 /* Free network device */
10332 kobject_put(&dev->dev.kobj);
10336 /* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has
10337 * all the same fields in the same order as net_device_stats, with only
10338 * the type differing, but rtnl_link_stats64 may have additional fields
10339 * at the end for newer counters.
10341 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
10342 const struct net_device_stats *netdev_stats)
10344 #if BITS_PER_LONG == 64
10345 BUILD_BUG_ON(sizeof(*stats64) < sizeof(*netdev_stats));
10346 memcpy(stats64, netdev_stats, sizeof(*netdev_stats));
10347 /* zero out counters that only exist in rtnl_link_stats64 */
10348 memset((char *)stats64 + sizeof(*netdev_stats), 0,
10349 sizeof(*stats64) - sizeof(*netdev_stats));
10351 size_t i, n = sizeof(*netdev_stats) / sizeof(unsigned long);
10352 const unsigned long *src = (const unsigned long *)netdev_stats;
10353 u64 *dst = (u64 *)stats64;
10355 BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64));
10356 for (i = 0; i < n; i++)
10358 /* zero out counters that only exist in rtnl_link_stats64 */
10359 memset((char *)stats64 + n * sizeof(u64), 0,
10360 sizeof(*stats64) - n * sizeof(u64));
10363 EXPORT_SYMBOL(netdev_stats_to_stats64);
10366 * dev_get_stats - get network device statistics
10367 * @dev: device to get statistics from
10368 * @storage: place to store stats
10370 * Get network statistics from device. Return @storage.
10371 * The device driver may provide its own method by setting
10372 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
10373 * otherwise the internal statistics structure is used.
10375 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
10376 struct rtnl_link_stats64 *storage)
10378 const struct net_device_ops *ops = dev->netdev_ops;
10380 if (ops->ndo_get_stats64) {
10381 memset(storage, 0, sizeof(*storage));
10382 ops->ndo_get_stats64(dev, storage);
10383 } else if (ops->ndo_get_stats) {
10384 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
10386 netdev_stats_to_stats64(storage, &dev->stats);
10388 storage->rx_dropped += (unsigned long)atomic_long_read(&dev->rx_dropped);
10389 storage->tx_dropped += (unsigned long)atomic_long_read(&dev->tx_dropped);
10390 storage->rx_nohandler += (unsigned long)atomic_long_read(&dev->rx_nohandler);
10393 EXPORT_SYMBOL(dev_get_stats);
10396 * dev_fetch_sw_netstats - get per-cpu network device statistics
10397 * @s: place to store stats
10398 * @netstats: per-cpu network stats to read from
10400 * Read per-cpu network statistics and populate the related fields in @s.
10402 void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s,
10403 const struct pcpu_sw_netstats __percpu *netstats)
10407 for_each_possible_cpu(cpu) {
10408 const struct pcpu_sw_netstats *stats;
10409 struct pcpu_sw_netstats tmp;
10410 unsigned int start;
10412 stats = per_cpu_ptr(netstats, cpu);
10414 start = u64_stats_fetch_begin_irq(&stats->syncp);
10415 tmp.rx_packets = stats->rx_packets;
10416 tmp.rx_bytes = stats->rx_bytes;
10417 tmp.tx_packets = stats->tx_packets;
10418 tmp.tx_bytes = stats->tx_bytes;
10419 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
10421 s->rx_packets += tmp.rx_packets;
10422 s->rx_bytes += tmp.rx_bytes;
10423 s->tx_packets += tmp.tx_packets;
10424 s->tx_bytes += tmp.tx_bytes;
10427 EXPORT_SYMBOL_GPL(dev_fetch_sw_netstats);
10430 * dev_get_tstats64 - ndo_get_stats64 implementation
10431 * @dev: device to get statistics from
10432 * @s: place to store stats
10434 * Populate @s from dev->stats and dev->tstats. Can be used as
10435 * ndo_get_stats64() callback.
10437 void dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s)
10439 netdev_stats_to_stats64(s, &dev->stats);
10440 dev_fetch_sw_netstats(s, dev->tstats);
10442 EXPORT_SYMBOL_GPL(dev_get_tstats64);
10444 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
10446 struct netdev_queue *queue = dev_ingress_queue(dev);
10448 #ifdef CONFIG_NET_CLS_ACT
10451 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
10454 netdev_init_one_queue(dev, queue, NULL);
10455 RCU_INIT_POINTER(queue->qdisc, &noop_qdisc);
10456 queue->qdisc_sleeping = &noop_qdisc;
10457 rcu_assign_pointer(dev->ingress_queue, queue);
10462 static const struct ethtool_ops default_ethtool_ops;
10464 void netdev_set_default_ethtool_ops(struct net_device *dev,
10465 const struct ethtool_ops *ops)
10467 if (dev->ethtool_ops == &default_ethtool_ops)
10468 dev->ethtool_ops = ops;
10470 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops);
10472 void netdev_freemem(struct net_device *dev)
10474 char *addr = (char *)dev - dev->padded;
10480 * alloc_netdev_mqs - allocate network device
10481 * @sizeof_priv: size of private data to allocate space for
10482 * @name: device name format string
10483 * @name_assign_type: origin of device name
10484 * @setup: callback to initialize device
10485 * @txqs: the number of TX subqueues to allocate
10486 * @rxqs: the number of RX subqueues to allocate
10488 * Allocates a struct net_device with private data area for driver use
10489 * and performs basic initialization. Also allocates subqueue structs
10490 * for each queue on the device.
10492 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
10493 unsigned char name_assign_type,
10494 void (*setup)(struct net_device *),
10495 unsigned int txqs, unsigned int rxqs)
10497 struct net_device *dev;
10498 unsigned int alloc_size;
10499 struct net_device *p;
10501 BUG_ON(strlen(name) >= sizeof(dev->name));
10504 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
10509 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
10513 alloc_size = sizeof(struct net_device);
10515 /* ensure 32-byte alignment of private area */
10516 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
10517 alloc_size += sizeof_priv;
10519 /* ensure 32-byte alignment of whole construct */
10520 alloc_size += NETDEV_ALIGN - 1;
10522 p = kvzalloc(alloc_size, GFP_KERNEL | __GFP_RETRY_MAYFAIL);
10526 dev = PTR_ALIGN(p, NETDEV_ALIGN);
10527 dev->padded = (char *)dev - (char *)p;
10529 dev->pcpu_refcnt = alloc_percpu(int);
10530 if (!dev->pcpu_refcnt)
10533 if (dev_addr_init(dev))
10539 dev_net_set(dev, &init_net);
10541 dev->gso_max_size = GSO_MAX_SIZE;
10542 dev->gso_max_segs = GSO_MAX_SEGS;
10543 dev->upper_level = 1;
10544 dev->lower_level = 1;
10545 #ifdef CONFIG_LOCKDEP
10546 dev->nested_level = 0;
10547 INIT_LIST_HEAD(&dev->unlink_list);
10550 INIT_LIST_HEAD(&dev->napi_list);
10551 INIT_LIST_HEAD(&dev->unreg_list);
10552 INIT_LIST_HEAD(&dev->close_list);
10553 INIT_LIST_HEAD(&dev->link_watch_list);
10554 INIT_LIST_HEAD(&dev->adj_list.upper);
10555 INIT_LIST_HEAD(&dev->adj_list.lower);
10556 INIT_LIST_HEAD(&dev->ptype_all);
10557 INIT_LIST_HEAD(&dev->ptype_specific);
10558 INIT_LIST_HEAD(&dev->net_notifier_list);
10559 #ifdef CONFIG_NET_SCHED
10560 hash_init(dev->qdisc_hash);
10562 dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM;
10565 if (!dev->tx_queue_len) {
10566 dev->priv_flags |= IFF_NO_QUEUE;
10567 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
10570 dev->num_tx_queues = txqs;
10571 dev->real_num_tx_queues = txqs;
10572 if (netif_alloc_netdev_queues(dev))
10575 dev->num_rx_queues = rxqs;
10576 dev->real_num_rx_queues = rxqs;
10577 if (netif_alloc_rx_queues(dev))
10580 strcpy(dev->name, name);
10581 dev->name_assign_type = name_assign_type;
10582 dev->group = INIT_NETDEV_GROUP;
10583 if (!dev->ethtool_ops)
10584 dev->ethtool_ops = &default_ethtool_ops;
10586 nf_hook_ingress_init(dev);
10595 free_percpu(dev->pcpu_refcnt);
10597 netdev_freemem(dev);
10600 EXPORT_SYMBOL(alloc_netdev_mqs);
10603 * free_netdev - free network device
10606 * This function does the last stage of destroying an allocated device
10607 * interface. The reference to the device object is released. If this
10608 * is the last reference then it will be freed.Must be called in process
10611 void free_netdev(struct net_device *dev)
10613 struct napi_struct *p, *n;
10616 netif_free_tx_queues(dev);
10617 netif_free_rx_queues(dev);
10619 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
10621 /* Flush device addresses */
10622 dev_addr_flush(dev);
10624 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
10627 free_percpu(dev->pcpu_refcnt);
10628 dev->pcpu_refcnt = NULL;
10629 free_percpu(dev->xdp_bulkq);
10630 dev->xdp_bulkq = NULL;
10632 /* Compatibility with error handling in drivers */
10633 if (dev->reg_state == NETREG_UNINITIALIZED) {
10634 netdev_freemem(dev);
10638 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
10639 dev->reg_state = NETREG_RELEASED;
10641 /* will free via device release */
10642 put_device(&dev->dev);
10644 EXPORT_SYMBOL(free_netdev);
10647 * synchronize_net - Synchronize with packet receive processing
10649 * Wait for packets currently being received to be done.
10650 * Does not block later packets from starting.
10652 void synchronize_net(void)
10655 if (rtnl_is_locked())
10656 synchronize_rcu_expedited();
10660 EXPORT_SYMBOL(synchronize_net);
10663 * unregister_netdevice_queue - remove device from the kernel
10667 * This function shuts down a device interface and removes it
10668 * from the kernel tables.
10669 * If head not NULL, device is queued to be unregistered later.
10671 * Callers must hold the rtnl semaphore. You may want
10672 * unregister_netdev() instead of this.
10675 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
10680 list_move_tail(&dev->unreg_list, head);
10682 rollback_registered(dev);
10683 /* Finish processing unregister after unlock */
10687 EXPORT_SYMBOL(unregister_netdevice_queue);
10690 * unregister_netdevice_many - unregister many devices
10691 * @head: list of devices
10693 * Note: As most callers use a stack allocated list_head,
10694 * we force a list_del() to make sure stack wont be corrupted later.
10696 void unregister_netdevice_many(struct list_head *head)
10698 struct net_device *dev;
10700 if (!list_empty(head)) {
10701 rollback_registered_many(head);
10702 list_for_each_entry(dev, head, unreg_list)
10707 EXPORT_SYMBOL(unregister_netdevice_many);
10710 * unregister_netdev - remove device from the kernel
10713 * This function shuts down a device interface and removes it
10714 * from the kernel tables.
10716 * This is just a wrapper for unregister_netdevice that takes
10717 * the rtnl semaphore. In general you want to use this and not
10718 * unregister_netdevice.
10720 void unregister_netdev(struct net_device *dev)
10723 unregister_netdevice(dev);
10726 EXPORT_SYMBOL(unregister_netdev);
10729 * dev_change_net_namespace - move device to different nethost namespace
10731 * @net: network namespace
10732 * @pat: If not NULL name pattern to try if the current device name
10733 * is already taken in the destination network namespace.
10735 * This function shuts down a device interface and moves it
10736 * to a new network namespace. On success 0 is returned, on
10737 * a failure a netagive errno code is returned.
10739 * Callers must hold the rtnl semaphore.
10742 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
10744 struct net *net_old = dev_net(dev);
10745 int err, new_nsid, new_ifindex;
10749 /* Don't allow namespace local devices to be moved. */
10751 if (dev->features & NETIF_F_NETNS_LOCAL)
10754 /* Ensure the device has been registrered */
10755 if (dev->reg_state != NETREG_REGISTERED)
10758 /* Get out if there is nothing todo */
10760 if (net_eq(net_old, net))
10763 /* Pick the destination device name, and ensure
10764 * we can use it in the destination network namespace.
10767 if (__dev_get_by_name(net, dev->name)) {
10768 /* We get here if we can't use the current device name */
10771 err = dev_get_valid_name(net, dev, pat);
10777 * And now a mini version of register_netdevice unregister_netdevice.
10780 /* If device is running close it first. */
10783 /* And unlink it from device chain */
10784 unlist_netdevice(dev);
10788 /* Shutdown queueing discipline. */
10791 /* Notify protocols, that we are about to destroy
10792 * this device. They should clean all the things.
10794 * Note that dev->reg_state stays at NETREG_REGISTERED.
10795 * This is wanted because this way 8021q and macvlan know
10796 * the device is just moving and can keep their slaves up.
10798 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
10801 new_nsid = peernet2id_alloc(dev_net(dev), net, GFP_KERNEL);
10802 /* If there is an ifindex conflict assign a new one */
10803 if (__dev_get_by_index(net, dev->ifindex))
10804 new_ifindex = dev_new_index(net);
10806 new_ifindex = dev->ifindex;
10808 rtmsg_ifinfo_newnet(RTM_DELLINK, dev, ~0U, GFP_KERNEL, &new_nsid,
10812 * Flush the unicast and multicast chains
10817 /* Send a netdev-removed uevent to the old namespace */
10818 kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE);
10819 netdev_adjacent_del_links(dev);
10821 /* Move per-net netdevice notifiers that are following the netdevice */
10822 move_netdevice_notifiers_dev_net(dev, net);
10824 /* Actually switch the network namespace */
10825 dev_net_set(dev, net);
10826 dev->ifindex = new_ifindex;
10828 /* Send a netdev-add uevent to the new namespace */
10829 kobject_uevent(&dev->dev.kobj, KOBJ_ADD);
10830 netdev_adjacent_add_links(dev);
10832 /* Fixup kobjects */
10833 err = device_rename(&dev->dev, dev->name);
10836 /* Adapt owner in case owning user namespace of target network
10837 * namespace is different from the original one.
10839 err = netdev_change_owner(dev, net_old, net);
10842 /* Add the device back in the hashes */
10843 list_netdevice(dev);
10845 /* Notify protocols, that a new device appeared. */
10846 call_netdevice_notifiers(NETDEV_REGISTER, dev);
10849 * Prevent userspace races by waiting until the network
10850 * device is fully setup before sending notifications.
10852 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
10859 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
10861 static int dev_cpu_dead(unsigned int oldcpu)
10863 struct sk_buff **list_skb;
10864 struct sk_buff *skb;
10866 struct softnet_data *sd, *oldsd, *remsd = NULL;
10868 local_irq_disable();
10869 cpu = smp_processor_id();
10870 sd = &per_cpu(softnet_data, cpu);
10871 oldsd = &per_cpu(softnet_data, oldcpu);
10873 /* Find end of our completion_queue. */
10874 list_skb = &sd->completion_queue;
10876 list_skb = &(*list_skb)->next;
10877 /* Append completion queue from offline CPU. */
10878 *list_skb = oldsd->completion_queue;
10879 oldsd->completion_queue = NULL;
10881 /* Append output queue from offline CPU. */
10882 if (oldsd->output_queue) {
10883 *sd->output_queue_tailp = oldsd->output_queue;
10884 sd->output_queue_tailp = oldsd->output_queue_tailp;
10885 oldsd->output_queue = NULL;
10886 oldsd->output_queue_tailp = &oldsd->output_queue;
10888 /* Append NAPI poll list from offline CPU, with one exception :
10889 * process_backlog() must be called by cpu owning percpu backlog.
10890 * We properly handle process_queue & input_pkt_queue later.
10892 while (!list_empty(&oldsd->poll_list)) {
10893 struct napi_struct *napi = list_first_entry(&oldsd->poll_list,
10894 struct napi_struct,
10897 list_del_init(&napi->poll_list);
10898 if (napi->poll == process_backlog)
10901 ____napi_schedule(sd, napi);
10904 raise_softirq_irqoff(NET_TX_SOFTIRQ);
10905 local_irq_enable();
10908 remsd = oldsd->rps_ipi_list;
10909 oldsd->rps_ipi_list = NULL;
10911 /* send out pending IPI's on offline CPU */
10912 net_rps_send_ipi(remsd);
10914 /* Process offline CPU's input_pkt_queue */
10915 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
10917 input_queue_head_incr(oldsd);
10919 while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) {
10921 input_queue_head_incr(oldsd);
10928 * netdev_increment_features - increment feature set by one
10929 * @all: current feature set
10930 * @one: new feature set
10931 * @mask: mask feature set
10933 * Computes a new feature set after adding a device with feature set
10934 * @one to the master device with current feature set @all. Will not
10935 * enable anything that is off in @mask. Returns the new feature set.
10937 netdev_features_t netdev_increment_features(netdev_features_t all,
10938 netdev_features_t one, netdev_features_t mask)
10940 if (mask & NETIF_F_HW_CSUM)
10941 mask |= NETIF_F_CSUM_MASK;
10942 mask |= NETIF_F_VLAN_CHALLENGED;
10944 all |= one & (NETIF_F_ONE_FOR_ALL | NETIF_F_CSUM_MASK) & mask;
10945 all &= one | ~NETIF_F_ALL_FOR_ALL;
10947 /* If one device supports hw checksumming, set for all. */
10948 if (all & NETIF_F_HW_CSUM)
10949 all &= ~(NETIF_F_CSUM_MASK & ~NETIF_F_HW_CSUM);
10953 EXPORT_SYMBOL(netdev_increment_features);
10955 static struct hlist_head * __net_init netdev_create_hash(void)
10958 struct hlist_head *hash;
10960 hash = kmalloc_array(NETDEV_HASHENTRIES, sizeof(*hash), GFP_KERNEL);
10962 for (i = 0; i < NETDEV_HASHENTRIES; i++)
10963 INIT_HLIST_HEAD(&hash[i]);
10968 /* Initialize per network namespace state */
10969 static int __net_init netdev_init(struct net *net)
10971 BUILD_BUG_ON(GRO_HASH_BUCKETS >
10972 8 * sizeof_field(struct napi_struct, gro_bitmask));
10974 if (net != &init_net)
10975 INIT_LIST_HEAD(&net->dev_base_head);
10977 net->dev_name_head = netdev_create_hash();
10978 if (net->dev_name_head == NULL)
10981 net->dev_index_head = netdev_create_hash();
10982 if (net->dev_index_head == NULL)
10985 RAW_INIT_NOTIFIER_HEAD(&net->netdev_chain);
10990 kfree(net->dev_name_head);
10996 * netdev_drivername - network driver for the device
10997 * @dev: network device
10999 * Determine network driver for device.
11001 const char *netdev_drivername(const struct net_device *dev)
11003 const struct device_driver *driver;
11004 const struct device *parent;
11005 const char *empty = "";
11007 parent = dev->dev.parent;
11011 driver = parent->driver;
11012 if (driver && driver->name)
11013 return driver->name;
11017 static void __netdev_printk(const char *level, const struct net_device *dev,
11018 struct va_format *vaf)
11020 if (dev && dev->dev.parent) {
11021 dev_printk_emit(level[1] - '0',
11024 dev_driver_string(dev->dev.parent),
11025 dev_name(dev->dev.parent),
11026 netdev_name(dev), netdev_reg_state(dev),
11029 printk("%s%s%s: %pV",
11030 level, netdev_name(dev), netdev_reg_state(dev), vaf);
11032 printk("%s(NULL net_device): %pV", level, vaf);
11036 void netdev_printk(const char *level, const struct net_device *dev,
11037 const char *format, ...)
11039 struct va_format vaf;
11042 va_start(args, format);
11047 __netdev_printk(level, dev, &vaf);
11051 EXPORT_SYMBOL(netdev_printk);
11053 #define define_netdev_printk_level(func, level) \
11054 void func(const struct net_device *dev, const char *fmt, ...) \
11056 struct va_format vaf; \
11059 va_start(args, fmt); \
11064 __netdev_printk(level, dev, &vaf); \
11068 EXPORT_SYMBOL(func);
11070 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
11071 define_netdev_printk_level(netdev_alert, KERN_ALERT);
11072 define_netdev_printk_level(netdev_crit, KERN_CRIT);
11073 define_netdev_printk_level(netdev_err, KERN_ERR);
11074 define_netdev_printk_level(netdev_warn, KERN_WARNING);
11075 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
11076 define_netdev_printk_level(netdev_info, KERN_INFO);
11078 static void __net_exit netdev_exit(struct net *net)
11080 kfree(net->dev_name_head);
11081 kfree(net->dev_index_head);
11082 if (net != &init_net)
11083 WARN_ON_ONCE(!list_empty(&net->dev_base_head));
11086 static struct pernet_operations __net_initdata netdev_net_ops = {
11087 .init = netdev_init,
11088 .exit = netdev_exit,
11091 static void __net_exit default_device_exit(struct net *net)
11093 struct net_device *dev, *aux;
11095 * Push all migratable network devices back to the
11096 * initial network namespace
11099 for_each_netdev_safe(net, dev, aux) {
11101 char fb_name[IFNAMSIZ];
11103 /* Ignore unmoveable devices (i.e. loopback) */
11104 if (dev->features & NETIF_F_NETNS_LOCAL)
11107 /* Leave virtual devices for the generic cleanup */
11108 if (dev->rtnl_link_ops)
11111 /* Push remaining network devices to init_net */
11112 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
11113 if (__dev_get_by_name(&init_net, fb_name))
11114 snprintf(fb_name, IFNAMSIZ, "dev%%d");
11115 err = dev_change_net_namespace(dev, &init_net, fb_name);
11117 pr_emerg("%s: failed to move %s to init_net: %d\n",
11118 __func__, dev->name, err);
11125 static void __net_exit rtnl_lock_unregistering(struct list_head *net_list)
11127 /* Return with the rtnl_lock held when there are no network
11128 * devices unregistering in any network namespace in net_list.
11131 bool unregistering;
11132 DEFINE_WAIT_FUNC(wait, woken_wake_function);
11134 add_wait_queue(&netdev_unregistering_wq, &wait);
11136 unregistering = false;
11138 list_for_each_entry(net, net_list, exit_list) {
11139 if (net->dev_unreg_count > 0) {
11140 unregistering = true;
11144 if (!unregistering)
11148 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
11150 remove_wait_queue(&netdev_unregistering_wq, &wait);
11153 static void __net_exit default_device_exit_batch(struct list_head *net_list)
11155 /* At exit all network devices most be removed from a network
11156 * namespace. Do this in the reverse order of registration.
11157 * Do this across as many network namespaces as possible to
11158 * improve batching efficiency.
11160 struct net_device *dev;
11162 LIST_HEAD(dev_kill_list);
11164 /* To prevent network device cleanup code from dereferencing
11165 * loopback devices or network devices that have been freed
11166 * wait here for all pending unregistrations to complete,
11167 * before unregistring the loopback device and allowing the
11168 * network namespace be freed.
11170 * The netdev todo list containing all network devices
11171 * unregistrations that happen in default_device_exit_batch
11172 * will run in the rtnl_unlock() at the end of
11173 * default_device_exit_batch.
11175 rtnl_lock_unregistering(net_list);
11176 list_for_each_entry(net, net_list, exit_list) {
11177 for_each_netdev_reverse(net, dev) {
11178 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink)
11179 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
11181 unregister_netdevice_queue(dev, &dev_kill_list);
11184 unregister_netdevice_many(&dev_kill_list);
11188 static struct pernet_operations __net_initdata default_device_ops = {
11189 .exit = default_device_exit,
11190 .exit_batch = default_device_exit_batch,
11194 * Initialize the DEV module. At boot time this walks the device list and
11195 * unhooks any devices that fail to initialise (normally hardware not
11196 * present) and leaves us with a valid list of present and active devices.
11201 * This is called single threaded during boot, so no need
11202 * to take the rtnl semaphore.
11204 static int __init net_dev_init(void)
11206 int i, rc = -ENOMEM;
11208 BUG_ON(!dev_boot_phase);
11210 if (dev_proc_init())
11213 if (netdev_kobject_init())
11216 INIT_LIST_HEAD(&ptype_all);
11217 for (i = 0; i < PTYPE_HASH_SIZE; i++)
11218 INIT_LIST_HEAD(&ptype_base[i]);
11220 INIT_LIST_HEAD(&offload_base);
11222 if (register_pernet_subsys(&netdev_net_ops))
11226 * Initialise the packet receive queues.
11229 for_each_possible_cpu(i) {
11230 struct work_struct *flush = per_cpu_ptr(&flush_works, i);
11231 struct softnet_data *sd = &per_cpu(softnet_data, i);
11233 INIT_WORK(flush, flush_backlog);
11235 skb_queue_head_init(&sd->input_pkt_queue);
11236 skb_queue_head_init(&sd->process_queue);
11237 #ifdef CONFIG_XFRM_OFFLOAD
11238 skb_queue_head_init(&sd->xfrm_backlog);
11240 INIT_LIST_HEAD(&sd->poll_list);
11241 sd->output_queue_tailp = &sd->output_queue;
11243 INIT_CSD(&sd->csd, rps_trigger_softirq, sd);
11247 init_gro_hash(&sd->backlog);
11248 sd->backlog.poll = process_backlog;
11249 sd->backlog.weight = weight_p;
11252 dev_boot_phase = 0;
11254 /* The loopback device is special if any other network devices
11255 * is present in a network namespace the loopback device must
11256 * be present. Since we now dynamically allocate and free the
11257 * loopback device ensure this invariant is maintained by
11258 * keeping the loopback device as the first device on the
11259 * list of network devices. Ensuring the loopback devices
11260 * is the first device that appears and the last network device
11263 if (register_pernet_device(&loopback_net_ops))
11266 if (register_pernet_device(&default_device_ops))
11269 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
11270 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
11272 rc = cpuhp_setup_state_nocalls(CPUHP_NET_DEV_DEAD, "net/dev:dead",
11273 NULL, dev_cpu_dead);
11280 subsys_initcall(net_dev_init);