1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * net-sysfs.c - network device class and attributes
5 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
8 #include <linux/capability.h>
9 #include <linux/kernel.h>
10 #include <linux/netdevice.h>
11 #include <linux/if_arp.h>
12 #include <linux/slab.h>
13 #include <linux/sched/signal.h>
14 #include <linux/nsproxy.h>
16 #include <net/net_namespace.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/vmalloc.h>
19 #include <linux/export.h>
20 #include <linux/jiffies.h>
21 #include <linux/pm_runtime.h>
23 #include <linux/of_net.h>
24 #include <linux/cpu.h>
26 #include "net-sysfs.h"
29 static const char fmt_hex[] = "%#x\n";
30 static const char fmt_dec[] = "%d\n";
31 static const char fmt_ulong[] = "%lu\n";
32 static const char fmt_u64[] = "%llu\n";
34 static inline int dev_isalive(const struct net_device *dev)
36 return dev->reg_state <= NETREG_REGISTERED;
39 /* use same locking rules as GIF* ioctl's */
40 static ssize_t netdev_show(const struct device *dev,
41 struct device_attribute *attr, char *buf,
42 ssize_t (*format)(const struct net_device *, char *))
44 struct net_device *ndev = to_net_dev(dev);
45 ssize_t ret = -EINVAL;
47 read_lock(&dev_base_lock);
48 if (dev_isalive(ndev))
49 ret = (*format)(ndev, buf);
50 read_unlock(&dev_base_lock);
55 /* generate a show function for simple field */
56 #define NETDEVICE_SHOW(field, format_string) \
57 static ssize_t format_##field(const struct net_device *dev, char *buf) \
59 return sprintf(buf, format_string, dev->field); \
61 static ssize_t field##_show(struct device *dev, \
62 struct device_attribute *attr, char *buf) \
64 return netdev_show(dev, attr, buf, format_##field); \
67 #define NETDEVICE_SHOW_RO(field, format_string) \
68 NETDEVICE_SHOW(field, format_string); \
69 static DEVICE_ATTR_RO(field)
71 #define NETDEVICE_SHOW_RW(field, format_string) \
72 NETDEVICE_SHOW(field, format_string); \
73 static DEVICE_ATTR_RW(field)
75 /* use same locking and permission rules as SIF* ioctl's */
76 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
77 const char *buf, size_t len,
78 int (*set)(struct net_device *, unsigned long))
80 struct net_device *netdev = to_net_dev(dev);
81 struct net *net = dev_net(netdev);
85 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
88 ret = kstrtoul(buf, 0, &new);
93 return restart_syscall();
95 if (dev_isalive(netdev)) {
96 ret = (*set)(netdev, new);
105 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
106 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
107 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
108 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
109 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
110 NETDEVICE_SHOW_RO(type, fmt_dec);
111 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
113 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
116 struct net_device *ndev = to_net_dev(dev);
118 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
120 static DEVICE_ATTR_RO(iflink);
122 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
124 return sprintf(buf, fmt_dec, dev->name_assign_type);
127 static ssize_t name_assign_type_show(struct device *dev,
128 struct device_attribute *attr,
131 struct net_device *ndev = to_net_dev(dev);
132 ssize_t ret = -EINVAL;
134 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
135 ret = netdev_show(dev, attr, buf, format_name_assign_type);
139 static DEVICE_ATTR_RO(name_assign_type);
141 /* use same locking rules as GIFHWADDR ioctl's */
142 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
145 struct net_device *ndev = to_net_dev(dev);
146 ssize_t ret = -EINVAL;
148 read_lock(&dev_base_lock);
149 if (dev_isalive(ndev))
150 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
151 read_unlock(&dev_base_lock);
154 static DEVICE_ATTR_RO(address);
156 static ssize_t broadcast_show(struct device *dev,
157 struct device_attribute *attr, char *buf)
159 struct net_device *ndev = to_net_dev(dev);
161 if (dev_isalive(ndev))
162 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
165 static DEVICE_ATTR_RO(broadcast);
167 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
169 if (!netif_running(dev))
171 return dev_change_carrier(dev, (bool)new_carrier);
174 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
175 const char *buf, size_t len)
177 return netdev_store(dev, attr, buf, len, change_carrier);
180 static ssize_t carrier_show(struct device *dev,
181 struct device_attribute *attr, char *buf)
183 struct net_device *netdev = to_net_dev(dev);
185 if (netif_running(netdev))
186 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
190 static DEVICE_ATTR_RW(carrier);
192 static ssize_t speed_show(struct device *dev,
193 struct device_attribute *attr, char *buf)
195 struct net_device *netdev = to_net_dev(dev);
199 return restart_syscall();
201 if (netif_running(netdev)) {
202 struct ethtool_link_ksettings cmd;
204 if (!__ethtool_get_link_ksettings(netdev, &cmd))
205 ret = sprintf(buf, fmt_dec, cmd.base.speed);
210 static DEVICE_ATTR_RO(speed);
212 static ssize_t duplex_show(struct device *dev,
213 struct device_attribute *attr, char *buf)
215 struct net_device *netdev = to_net_dev(dev);
219 return restart_syscall();
221 if (netif_running(netdev)) {
222 struct ethtool_link_ksettings cmd;
224 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
227 switch (cmd.base.duplex) {
238 ret = sprintf(buf, "%s\n", duplex);
244 static DEVICE_ATTR_RO(duplex);
246 static ssize_t testing_show(struct device *dev,
247 struct device_attribute *attr, char *buf)
249 struct net_device *netdev = to_net_dev(dev);
251 if (netif_running(netdev))
252 return sprintf(buf, fmt_dec, !!netif_testing(netdev));
256 static DEVICE_ATTR_RO(testing);
258 static ssize_t dormant_show(struct device *dev,
259 struct device_attribute *attr, char *buf)
261 struct net_device *netdev = to_net_dev(dev);
263 if (netif_running(netdev))
264 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
268 static DEVICE_ATTR_RO(dormant);
270 static const char *const operstates[] = {
272 "notpresent", /* currently unused */
280 static ssize_t operstate_show(struct device *dev,
281 struct device_attribute *attr, char *buf)
283 const struct net_device *netdev = to_net_dev(dev);
284 unsigned char operstate;
286 read_lock(&dev_base_lock);
287 operstate = netdev->operstate;
288 if (!netif_running(netdev))
289 operstate = IF_OPER_DOWN;
290 read_unlock(&dev_base_lock);
292 if (operstate >= ARRAY_SIZE(operstates))
293 return -EINVAL; /* should not happen */
295 return sprintf(buf, "%s\n", operstates[operstate]);
297 static DEVICE_ATTR_RO(operstate);
299 static ssize_t carrier_changes_show(struct device *dev,
300 struct device_attribute *attr,
303 struct net_device *netdev = to_net_dev(dev);
305 return sprintf(buf, fmt_dec,
306 atomic_read(&netdev->carrier_up_count) +
307 atomic_read(&netdev->carrier_down_count));
309 static DEVICE_ATTR_RO(carrier_changes);
311 static ssize_t carrier_up_count_show(struct device *dev,
312 struct device_attribute *attr,
315 struct net_device *netdev = to_net_dev(dev);
317 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
319 static DEVICE_ATTR_RO(carrier_up_count);
321 static ssize_t carrier_down_count_show(struct device *dev,
322 struct device_attribute *attr,
325 struct net_device *netdev = to_net_dev(dev);
327 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
329 static DEVICE_ATTR_RO(carrier_down_count);
331 /* read-write attributes */
333 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
335 return dev_set_mtu(dev, (int)new_mtu);
338 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
339 const char *buf, size_t len)
341 return netdev_store(dev, attr, buf, len, change_mtu);
343 NETDEVICE_SHOW_RW(mtu, fmt_dec);
345 static int change_flags(struct net_device *dev, unsigned long new_flags)
347 return dev_change_flags(dev, (unsigned int)new_flags, NULL);
350 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
351 const char *buf, size_t len)
353 return netdev_store(dev, attr, buf, len, change_flags);
355 NETDEVICE_SHOW_RW(flags, fmt_hex);
357 static ssize_t tx_queue_len_store(struct device *dev,
358 struct device_attribute *attr,
359 const char *buf, size_t len)
361 if (!capable(CAP_NET_ADMIN))
364 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
366 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
368 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
370 WRITE_ONCE(dev->gro_flush_timeout, val);
374 static ssize_t gro_flush_timeout_store(struct device *dev,
375 struct device_attribute *attr,
376 const char *buf, size_t len)
378 if (!capable(CAP_NET_ADMIN))
381 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
383 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
385 static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val)
387 WRITE_ONCE(dev->napi_defer_hard_irqs, val);
391 static ssize_t napi_defer_hard_irqs_store(struct device *dev,
392 struct device_attribute *attr,
393 const char *buf, size_t len)
395 if (!capable(CAP_NET_ADMIN))
398 return netdev_store(dev, attr, buf, len, change_napi_defer_hard_irqs);
400 NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_dec);
402 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
403 const char *buf, size_t len)
405 struct net_device *netdev = to_net_dev(dev);
406 struct net *net = dev_net(netdev);
410 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
413 /* ignore trailing newline */
414 if (len > 0 && buf[len - 1] == '\n')
418 return restart_syscall();
420 if (dev_isalive(netdev)) {
421 ret = dev_set_alias(netdev, buf, count);
425 netdev_state_change(netdev);
433 static ssize_t ifalias_show(struct device *dev,
434 struct device_attribute *attr, char *buf)
436 const struct net_device *netdev = to_net_dev(dev);
440 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
442 ret = sprintf(buf, "%s\n", tmp);
445 static DEVICE_ATTR_RW(ifalias);
447 static int change_group(struct net_device *dev, unsigned long new_group)
449 dev_set_group(dev, (int)new_group);
453 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
454 const char *buf, size_t len)
456 return netdev_store(dev, attr, buf, len, change_group);
458 NETDEVICE_SHOW(group, fmt_dec);
459 static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
461 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
463 return dev_change_proto_down(dev, (bool)proto_down);
466 static ssize_t proto_down_store(struct device *dev,
467 struct device_attribute *attr,
468 const char *buf, size_t len)
470 return netdev_store(dev, attr, buf, len, change_proto_down);
472 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
474 static ssize_t phys_port_id_show(struct device *dev,
475 struct device_attribute *attr, char *buf)
477 struct net_device *netdev = to_net_dev(dev);
478 ssize_t ret = -EINVAL;
481 return restart_syscall();
483 if (dev_isalive(netdev)) {
484 struct netdev_phys_item_id ppid;
486 ret = dev_get_phys_port_id(netdev, &ppid);
488 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
494 static DEVICE_ATTR_RO(phys_port_id);
496 static ssize_t phys_port_name_show(struct device *dev,
497 struct device_attribute *attr, char *buf)
499 struct net_device *netdev = to_net_dev(dev);
500 ssize_t ret = -EINVAL;
503 return restart_syscall();
505 if (dev_isalive(netdev)) {
508 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
510 ret = sprintf(buf, "%s\n", name);
516 static DEVICE_ATTR_RO(phys_port_name);
518 static ssize_t phys_switch_id_show(struct device *dev,
519 struct device_attribute *attr, char *buf)
521 struct net_device *netdev = to_net_dev(dev);
522 ssize_t ret = -EINVAL;
525 return restart_syscall();
527 if (dev_isalive(netdev)) {
528 struct netdev_phys_item_id ppid = { };
530 ret = dev_get_port_parent_id(netdev, &ppid, false);
532 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
538 static DEVICE_ATTR_RO(phys_switch_id);
540 static struct attribute *net_class_attrs[] __ro_after_init = {
541 &dev_attr_netdev_group.attr,
543 &dev_attr_dev_id.attr,
544 &dev_attr_dev_port.attr,
545 &dev_attr_iflink.attr,
546 &dev_attr_ifindex.attr,
547 &dev_attr_name_assign_type.attr,
548 &dev_attr_addr_assign_type.attr,
549 &dev_attr_addr_len.attr,
550 &dev_attr_link_mode.attr,
551 &dev_attr_address.attr,
552 &dev_attr_broadcast.attr,
553 &dev_attr_speed.attr,
554 &dev_attr_duplex.attr,
555 &dev_attr_dormant.attr,
556 &dev_attr_testing.attr,
557 &dev_attr_operstate.attr,
558 &dev_attr_carrier_changes.attr,
559 &dev_attr_ifalias.attr,
560 &dev_attr_carrier.attr,
562 &dev_attr_flags.attr,
563 &dev_attr_tx_queue_len.attr,
564 &dev_attr_gro_flush_timeout.attr,
565 &dev_attr_napi_defer_hard_irqs.attr,
566 &dev_attr_phys_port_id.attr,
567 &dev_attr_phys_port_name.attr,
568 &dev_attr_phys_switch_id.attr,
569 &dev_attr_proto_down.attr,
570 &dev_attr_carrier_up_count.attr,
571 &dev_attr_carrier_down_count.attr,
574 ATTRIBUTE_GROUPS(net_class);
576 /* Show a given an attribute in the statistics group */
577 static ssize_t netstat_show(const struct device *d,
578 struct device_attribute *attr, char *buf,
579 unsigned long offset)
581 struct net_device *dev = to_net_dev(d);
582 ssize_t ret = -EINVAL;
584 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
585 offset % sizeof(u64) != 0);
587 read_lock(&dev_base_lock);
588 if (dev_isalive(dev)) {
589 struct rtnl_link_stats64 temp;
590 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
592 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
594 read_unlock(&dev_base_lock);
598 /* generate a read-only statistics attribute */
599 #define NETSTAT_ENTRY(name) \
600 static ssize_t name##_show(struct device *d, \
601 struct device_attribute *attr, char *buf) \
603 return netstat_show(d, attr, buf, \
604 offsetof(struct rtnl_link_stats64, name)); \
606 static DEVICE_ATTR_RO(name)
608 NETSTAT_ENTRY(rx_packets);
609 NETSTAT_ENTRY(tx_packets);
610 NETSTAT_ENTRY(rx_bytes);
611 NETSTAT_ENTRY(tx_bytes);
612 NETSTAT_ENTRY(rx_errors);
613 NETSTAT_ENTRY(tx_errors);
614 NETSTAT_ENTRY(rx_dropped);
615 NETSTAT_ENTRY(tx_dropped);
616 NETSTAT_ENTRY(multicast);
617 NETSTAT_ENTRY(collisions);
618 NETSTAT_ENTRY(rx_length_errors);
619 NETSTAT_ENTRY(rx_over_errors);
620 NETSTAT_ENTRY(rx_crc_errors);
621 NETSTAT_ENTRY(rx_frame_errors);
622 NETSTAT_ENTRY(rx_fifo_errors);
623 NETSTAT_ENTRY(rx_missed_errors);
624 NETSTAT_ENTRY(tx_aborted_errors);
625 NETSTAT_ENTRY(tx_carrier_errors);
626 NETSTAT_ENTRY(tx_fifo_errors);
627 NETSTAT_ENTRY(tx_heartbeat_errors);
628 NETSTAT_ENTRY(tx_window_errors);
629 NETSTAT_ENTRY(rx_compressed);
630 NETSTAT_ENTRY(tx_compressed);
631 NETSTAT_ENTRY(rx_nohandler);
633 static struct attribute *netstat_attrs[] __ro_after_init = {
634 &dev_attr_rx_packets.attr,
635 &dev_attr_tx_packets.attr,
636 &dev_attr_rx_bytes.attr,
637 &dev_attr_tx_bytes.attr,
638 &dev_attr_rx_errors.attr,
639 &dev_attr_tx_errors.attr,
640 &dev_attr_rx_dropped.attr,
641 &dev_attr_tx_dropped.attr,
642 &dev_attr_multicast.attr,
643 &dev_attr_collisions.attr,
644 &dev_attr_rx_length_errors.attr,
645 &dev_attr_rx_over_errors.attr,
646 &dev_attr_rx_crc_errors.attr,
647 &dev_attr_rx_frame_errors.attr,
648 &dev_attr_rx_fifo_errors.attr,
649 &dev_attr_rx_missed_errors.attr,
650 &dev_attr_tx_aborted_errors.attr,
651 &dev_attr_tx_carrier_errors.attr,
652 &dev_attr_tx_fifo_errors.attr,
653 &dev_attr_tx_heartbeat_errors.attr,
654 &dev_attr_tx_window_errors.attr,
655 &dev_attr_rx_compressed.attr,
656 &dev_attr_tx_compressed.attr,
657 &dev_attr_rx_nohandler.attr,
661 static const struct attribute_group netstat_group = {
662 .name = "statistics",
663 .attrs = netstat_attrs,
666 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
667 static struct attribute *wireless_attrs[] = {
671 static const struct attribute_group wireless_group = {
673 .attrs = wireless_attrs,
677 #else /* CONFIG_SYSFS */
678 #define net_class_groups NULL
679 #endif /* CONFIG_SYSFS */
682 #define to_rx_queue_attr(_attr) \
683 container_of(_attr, struct rx_queue_attribute, attr)
685 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
687 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
690 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
691 struct netdev_rx_queue *queue = to_rx_queue(kobj);
693 if (!attribute->show)
696 return attribute->show(queue, buf);
699 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
700 const char *buf, size_t count)
702 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
703 struct netdev_rx_queue *queue = to_rx_queue(kobj);
705 if (!attribute->store)
708 return attribute->store(queue, buf, count);
711 static const struct sysfs_ops rx_queue_sysfs_ops = {
712 .show = rx_queue_attr_show,
713 .store = rx_queue_attr_store,
717 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
723 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
727 map = rcu_dereference(queue->rps_map);
729 for (i = 0; i < map->len; i++)
730 cpumask_set_cpu(map->cpus[i], mask);
732 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
734 free_cpumask_var(mask);
736 return len < PAGE_SIZE ? len : -EINVAL;
739 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
740 const char *buf, size_t len)
742 struct rps_map *old_map, *map;
745 static DEFINE_MUTEX(rps_map_mutex);
747 if (!capable(CAP_NET_ADMIN))
750 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
753 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
755 free_cpumask_var(mask);
759 map = kzalloc(max_t(unsigned int,
760 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
763 free_cpumask_var(mask);
768 for_each_cpu_and(cpu, mask, cpu_online_mask)
769 map->cpus[i++] = cpu;
778 mutex_lock(&rps_map_mutex);
779 old_map = rcu_dereference_protected(queue->rps_map,
780 mutex_is_locked(&rps_map_mutex));
781 rcu_assign_pointer(queue->rps_map, map);
784 static_branch_inc(&rps_needed);
786 static_branch_dec(&rps_needed);
788 mutex_unlock(&rps_map_mutex);
791 kfree_rcu(old_map, rcu);
793 free_cpumask_var(mask);
797 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
800 struct rps_dev_flow_table *flow_table;
801 unsigned long val = 0;
804 flow_table = rcu_dereference(queue->rps_flow_table);
806 val = (unsigned long)flow_table->mask + 1;
809 return sprintf(buf, "%lu\n", val);
812 static void rps_dev_flow_table_release(struct rcu_head *rcu)
814 struct rps_dev_flow_table *table = container_of(rcu,
815 struct rps_dev_flow_table, rcu);
819 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
820 const char *buf, size_t len)
822 unsigned long mask, count;
823 struct rps_dev_flow_table *table, *old_table;
824 static DEFINE_SPINLOCK(rps_dev_flow_lock);
827 if (!capable(CAP_NET_ADMIN))
830 rc = kstrtoul(buf, 0, &count);
836 /* mask = roundup_pow_of_two(count) - 1;
837 * without overflows...
839 while ((mask | (mask >> 1)) != mask)
841 /* On 64 bit arches, must check mask fits in table->mask (u32),
842 * and on 32bit arches, must check
843 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
845 #if BITS_PER_LONG > 32
846 if (mask > (unsigned long)(u32)mask)
849 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
850 / sizeof(struct rps_dev_flow)) {
851 /* Enforce a limit to prevent overflow */
855 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
860 for (count = 0; count <= mask; count++)
861 table->flows[count].cpu = RPS_NO_CPU;
866 spin_lock(&rps_dev_flow_lock);
867 old_table = rcu_dereference_protected(queue->rps_flow_table,
868 lockdep_is_held(&rps_dev_flow_lock));
869 rcu_assign_pointer(queue->rps_flow_table, table);
870 spin_unlock(&rps_dev_flow_lock);
873 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
878 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
879 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
881 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
882 = __ATTR(rps_flow_cnt, 0644,
883 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
884 #endif /* CONFIG_RPS */
886 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
888 &rps_cpus_attribute.attr,
889 &rps_dev_flow_table_cnt_attribute.attr,
893 ATTRIBUTE_GROUPS(rx_queue_default);
895 static void rx_queue_release(struct kobject *kobj)
897 struct netdev_rx_queue *queue = to_rx_queue(kobj);
900 struct rps_dev_flow_table *flow_table;
902 map = rcu_dereference_protected(queue->rps_map, 1);
904 RCU_INIT_POINTER(queue->rps_map, NULL);
908 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
910 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
911 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
915 memset(kobj, 0, sizeof(*kobj));
919 static const void *rx_queue_namespace(struct kobject *kobj)
921 struct netdev_rx_queue *queue = to_rx_queue(kobj);
922 struct device *dev = &queue->dev->dev;
923 const void *ns = NULL;
925 if (dev->class && dev->class->ns_type)
926 ns = dev->class->namespace(dev);
931 static void rx_queue_get_ownership(struct kobject *kobj,
932 kuid_t *uid, kgid_t *gid)
934 const struct net *net = rx_queue_namespace(kobj);
936 net_ns_get_ownership(net, uid, gid);
939 static struct kobj_type rx_queue_ktype __ro_after_init = {
940 .sysfs_ops = &rx_queue_sysfs_ops,
941 .release = rx_queue_release,
942 .default_groups = rx_queue_default_groups,
943 .namespace = rx_queue_namespace,
944 .get_ownership = rx_queue_get_ownership,
947 static int rx_queue_add_kobject(struct net_device *dev, int index)
949 struct netdev_rx_queue *queue = dev->_rx + index;
950 struct kobject *kobj = &queue->kobj;
953 /* Kobject_put later will trigger rx_queue_release call which
954 * decreases dev refcount: Take that reference here
956 dev_hold(queue->dev);
958 kobj->kset = dev->queues_kset;
959 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
964 if (dev->sysfs_rx_queue_group) {
965 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
970 kobject_uevent(kobj, KOBJ_ADD);
979 static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
982 struct netdev_rx_queue *queue = dev->_rx + index;
983 struct kobject *kobj = &queue->kobj;
986 error = sysfs_change_owner(kobj, kuid, kgid);
990 if (dev->sysfs_rx_queue_group)
991 error = sysfs_group_change_owner(
992 kobj, dev->sysfs_rx_queue_group, kuid, kgid);
996 #endif /* CONFIG_SYSFS */
999 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1006 if (!dev->sysfs_rx_queue_group)
1009 for (i = old_num; i < new_num; i++) {
1010 error = rx_queue_add_kobject(dev, i);
1017 while (--i >= new_num) {
1018 struct kobject *kobj = &dev->_rx[i].kobj;
1020 if (!refcount_read(&dev_net(dev)->count))
1021 kobj->uevent_suppress = 1;
1022 if (dev->sysfs_rx_queue_group)
1023 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
1033 static int net_rx_queue_change_owner(struct net_device *dev, int num,
1034 kuid_t kuid, kgid_t kgid)
1041 if (!dev->sysfs_rx_queue_group)
1044 for (i = 0; i < num; i++) {
1045 error = rx_queue_change_owner(dev, i, kuid, kgid);
1058 * netdev_queue sysfs structures and functions.
1060 struct netdev_queue_attribute {
1061 struct attribute attr;
1062 ssize_t (*show)(struct netdev_queue *queue, char *buf);
1063 ssize_t (*store)(struct netdev_queue *queue,
1064 const char *buf, size_t len);
1066 #define to_netdev_queue_attr(_attr) \
1067 container_of(_attr, struct netdev_queue_attribute, attr)
1069 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1071 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1072 struct attribute *attr, char *buf)
1074 const struct netdev_queue_attribute *attribute
1075 = to_netdev_queue_attr(attr);
1076 struct netdev_queue *queue = to_netdev_queue(kobj);
1078 if (!attribute->show)
1081 return attribute->show(queue, buf);
1084 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1085 struct attribute *attr,
1086 const char *buf, size_t count)
1088 const struct netdev_queue_attribute *attribute
1089 = to_netdev_queue_attr(attr);
1090 struct netdev_queue *queue = to_netdev_queue(kobj);
1092 if (!attribute->store)
1095 return attribute->store(queue, buf, count);
1098 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1099 .show = netdev_queue_attr_show,
1100 .store = netdev_queue_attr_store,
1103 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1105 unsigned long trans_timeout;
1107 spin_lock_irq(&queue->_xmit_lock);
1108 trans_timeout = queue->trans_timeout;
1109 spin_unlock_irq(&queue->_xmit_lock);
1111 return sprintf(buf, "%lu", trans_timeout);
1114 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1116 struct net_device *dev = queue->dev;
1119 i = queue - dev->_tx;
1120 BUG_ON(i >= dev->num_tx_queues);
1125 static ssize_t traffic_class_show(struct netdev_queue *queue,
1128 struct net_device *dev = queue->dev;
1132 if (!netif_is_multiqueue(dev))
1135 index = get_netdev_queue_index(queue);
1137 /* If queue belongs to subordinate dev use its TC mapping */
1138 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1140 tc = netdev_txq_to_tc(dev, index);
1144 /* We can report the traffic class one of two ways:
1145 * Subordinate device traffic classes are reported with the traffic
1146 * class first, and then the subordinate class so for example TC0 on
1147 * subordinate device 2 will be reported as "0-2". If the queue
1148 * belongs to the root device it will be reported with just the
1149 * traffic class, so just "0" for TC 0 for example.
1151 return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1152 sprintf(buf, "%u\n", tc);
1156 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1159 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1162 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1163 const char *buf, size_t len)
1165 struct net_device *dev = queue->dev;
1166 int err, index = get_netdev_queue_index(queue);
1169 if (!capable(CAP_NET_ADMIN))
1172 err = kstrtou32(buf, 10, &rate);
1176 if (!rtnl_trylock())
1177 return restart_syscall();
1180 if (dev->netdev_ops->ndo_set_tx_maxrate)
1181 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1185 queue->tx_maxrate = rate;
1191 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1192 = __ATTR_RW(tx_maxrate);
1195 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1196 = __ATTR_RO(tx_timeout);
1198 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1199 = __ATTR_RO(traffic_class);
1203 * Byte queue limits sysfs structures and functions.
1205 static ssize_t bql_show(char *buf, unsigned int value)
1207 return sprintf(buf, "%u\n", value);
1210 static ssize_t bql_set(const char *buf, const size_t count,
1211 unsigned int *pvalue)
1216 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1217 value = DQL_MAX_LIMIT;
1219 err = kstrtouint(buf, 10, &value);
1222 if (value > DQL_MAX_LIMIT)
1231 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1234 struct dql *dql = &queue->dql;
1236 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1239 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1240 const char *buf, size_t len)
1242 struct dql *dql = &queue->dql;
1246 err = kstrtouint(buf, 10, &value);
1250 dql->slack_hold_time = msecs_to_jiffies(value);
1255 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1256 = __ATTR(hold_time, 0644,
1257 bql_show_hold_time, bql_set_hold_time);
1259 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1262 struct dql *dql = &queue->dql;
1264 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1267 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1268 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1270 #define BQL_ATTR(NAME, FIELD) \
1271 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1274 return bql_show(buf, queue->dql.FIELD); \
1277 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1278 const char *buf, size_t len) \
1280 return bql_set(buf, len, &queue->dql.FIELD); \
1283 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1284 = __ATTR(NAME, 0644, \
1285 bql_show_ ## NAME, bql_set_ ## NAME)
1287 BQL_ATTR(limit, limit);
1288 BQL_ATTR(limit_max, max_limit);
1289 BQL_ATTR(limit_min, min_limit);
1291 static struct attribute *dql_attrs[] __ro_after_init = {
1292 &bql_limit_attribute.attr,
1293 &bql_limit_max_attribute.attr,
1294 &bql_limit_min_attribute.attr,
1295 &bql_hold_time_attribute.attr,
1296 &bql_inflight_attribute.attr,
1300 static const struct attribute_group dql_group = {
1301 .name = "byte_queue_limits",
1304 #endif /* CONFIG_BQL */
1307 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1310 struct net_device *dev = queue->dev;
1311 int cpu, len, num_tc = 1, tc = 0;
1312 struct xps_dev_maps *dev_maps;
1314 unsigned long index;
1316 if (!netif_is_multiqueue(dev))
1319 index = get_netdev_queue_index(queue);
1322 /* Do not allow XPS on subordinate device directly */
1323 num_tc = dev->num_tc;
1327 /* If queue belongs to subordinate dev use its map */
1328 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1330 tc = netdev_txq_to_tc(dev, index);
1335 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1339 dev_maps = rcu_dereference(dev->xps_cpus_map);
1341 for_each_possible_cpu(cpu) {
1342 int i, tci = cpu * num_tc + tc;
1343 struct xps_map *map;
1345 map = rcu_dereference(dev_maps->attr_map[tci]);
1349 for (i = map->len; i--;) {
1350 if (map->queues[i] == index) {
1351 cpumask_set_cpu(cpu, mask);
1359 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1360 free_cpumask_var(mask);
1361 return len < PAGE_SIZE ? len : -EINVAL;
1364 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1365 const char *buf, size_t len)
1367 struct net_device *dev = queue->dev;
1368 unsigned long index;
1372 if (!netif_is_multiqueue(dev))
1375 if (!capable(CAP_NET_ADMIN))
1378 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1381 index = get_netdev_queue_index(queue);
1383 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1385 free_cpumask_var(mask);
1389 err = netif_set_xps_queue(dev, mask, index);
1391 free_cpumask_var(mask);
1396 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1397 = __ATTR_RW(xps_cpus);
1399 static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1401 struct net_device *dev = queue->dev;
1402 struct xps_dev_maps *dev_maps;
1403 unsigned long *mask, index;
1404 int j, len, num_tc = 1, tc = 0;
1406 index = get_netdev_queue_index(queue);
1409 num_tc = dev->num_tc;
1410 tc = netdev_txq_to_tc(dev, index);
1414 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1419 dev_maps = rcu_dereference(dev->xps_rxqs_map);
1423 for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1424 j < dev->num_rx_queues;) {
1425 int i, tci = j * num_tc + tc;
1426 struct xps_map *map;
1428 map = rcu_dereference(dev_maps->attr_map[tci]);
1432 for (i = map->len; i--;) {
1433 if (map->queues[i] == index) {
1442 len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1445 return len < PAGE_SIZE ? len : -EINVAL;
1448 static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1451 struct net_device *dev = queue->dev;
1452 struct net *net = dev_net(dev);
1453 unsigned long *mask, index;
1456 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1459 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1463 index = get_netdev_queue_index(queue);
1465 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1472 err = __netif_set_xps_queue(dev, mask, index, true);
1479 static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1480 = __ATTR_RW(xps_rxqs);
1481 #endif /* CONFIG_XPS */
1483 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1484 &queue_trans_timeout.attr,
1485 &queue_traffic_class.attr,
1487 &xps_cpus_attribute.attr,
1488 &xps_rxqs_attribute.attr,
1489 &queue_tx_maxrate.attr,
1493 ATTRIBUTE_GROUPS(netdev_queue_default);
1495 static void netdev_queue_release(struct kobject *kobj)
1497 struct netdev_queue *queue = to_netdev_queue(kobj);
1499 memset(kobj, 0, sizeof(*kobj));
1500 dev_put(queue->dev);
1503 static const void *netdev_queue_namespace(struct kobject *kobj)
1505 struct netdev_queue *queue = to_netdev_queue(kobj);
1506 struct device *dev = &queue->dev->dev;
1507 const void *ns = NULL;
1509 if (dev->class && dev->class->ns_type)
1510 ns = dev->class->namespace(dev);
1515 static void netdev_queue_get_ownership(struct kobject *kobj,
1516 kuid_t *uid, kgid_t *gid)
1518 const struct net *net = netdev_queue_namespace(kobj);
1520 net_ns_get_ownership(net, uid, gid);
1523 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1524 .sysfs_ops = &netdev_queue_sysfs_ops,
1525 .release = netdev_queue_release,
1526 .default_groups = netdev_queue_default_groups,
1527 .namespace = netdev_queue_namespace,
1528 .get_ownership = netdev_queue_get_ownership,
1531 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1533 struct netdev_queue *queue = dev->_tx + index;
1534 struct kobject *kobj = &queue->kobj;
1537 /* Kobject_put later will trigger netdev_queue_release call
1538 * which decreases dev refcount: Take that reference here
1540 dev_hold(queue->dev);
1542 kobj->kset = dev->queues_kset;
1543 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1549 error = sysfs_create_group(kobj, &dql_group);
1554 kobject_uevent(kobj, KOBJ_ADD);
1562 static int tx_queue_change_owner(struct net_device *ndev, int index,
1563 kuid_t kuid, kgid_t kgid)
1565 struct netdev_queue *queue = ndev->_tx + index;
1566 struct kobject *kobj = &queue->kobj;
1569 error = sysfs_change_owner(kobj, kuid, kgid);
1574 error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
1578 #endif /* CONFIG_SYSFS */
1581 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1587 for (i = old_num; i < new_num; i++) {
1588 error = netdev_queue_add_kobject(dev, i);
1595 while (--i >= new_num) {
1596 struct netdev_queue *queue = dev->_tx + i;
1598 if (!refcount_read(&dev_net(dev)->count))
1599 queue->kobj.uevent_suppress = 1;
1601 sysfs_remove_group(&queue->kobj, &dql_group);
1603 kobject_put(&queue->kobj);
1609 #endif /* CONFIG_SYSFS */
1612 static int net_tx_queue_change_owner(struct net_device *dev, int num,
1613 kuid_t kuid, kgid_t kgid)
1619 for (i = 0; i < num; i++) {
1620 error = tx_queue_change_owner(dev, i, kuid, kgid);
1628 #endif /* CONFIG_SYSFS */
1631 static int register_queue_kobjects(struct net_device *dev)
1633 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1636 dev->queues_kset = kset_create_and_add("queues",
1637 NULL, &dev->dev.kobj);
1638 if (!dev->queues_kset)
1640 real_rx = dev->real_num_rx_queues;
1642 real_tx = dev->real_num_tx_queues;
1644 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1649 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1657 netdev_queue_update_kobjects(dev, txq, 0);
1658 net_rx_queue_update_kobjects(dev, rxq, 0);
1660 kset_unregister(dev->queues_kset);
1665 static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
1667 int error = 0, real_rx = 0, real_tx = 0;
1670 if (ndev->queues_kset) {
1671 error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
1675 real_rx = ndev->real_num_rx_queues;
1677 real_tx = ndev->real_num_tx_queues;
1679 error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
1683 error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
1690 static void remove_queue_kobjects(struct net_device *dev)
1692 int real_rx = 0, real_tx = 0;
1695 real_rx = dev->real_num_rx_queues;
1697 real_tx = dev->real_num_tx_queues;
1699 net_rx_queue_update_kobjects(dev, real_rx, 0);
1700 netdev_queue_update_kobjects(dev, real_tx, 0);
1702 kset_unregister(dev->queues_kset);
1706 static bool net_current_may_mount(void)
1708 struct net *net = current->nsproxy->net_ns;
1710 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1713 static void *net_grab_current_ns(void)
1715 struct net *ns = current->nsproxy->net_ns;
1716 #ifdef CONFIG_NET_NS
1718 refcount_inc(&ns->passive);
1723 static const void *net_initial_ns(void)
1728 static const void *net_netlink_ns(struct sock *sk)
1730 return sock_net(sk);
1733 const struct kobj_ns_type_operations net_ns_type_operations = {
1734 .type = KOBJ_NS_TYPE_NET,
1735 .current_may_mount = net_current_may_mount,
1736 .grab_current_ns = net_grab_current_ns,
1737 .netlink_ns = net_netlink_ns,
1738 .initial_ns = net_initial_ns,
1739 .drop_ns = net_drop_ns,
1741 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1743 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1745 struct net_device *dev = to_net_dev(d);
1748 /* pass interface to uevent. */
1749 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1753 /* pass ifindex to uevent.
1754 * ifindex is useful as it won't change (interface name may change)
1755 * and is what RtNetlink uses natively.
1757 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1764 * netdev_release -- destroy and free a dead device.
1765 * Called when last reference to device kobject is gone.
1767 static void netdev_release(struct device *d)
1769 struct net_device *dev = to_net_dev(d);
1771 BUG_ON(dev->reg_state != NETREG_RELEASED);
1773 /* no need to wait for rcu grace period:
1774 * device is dead and about to be freed.
1776 kfree(rcu_access_pointer(dev->ifalias));
1777 netdev_freemem(dev);
1780 static const void *net_namespace(struct device *d)
1782 struct net_device *dev = to_net_dev(d);
1784 return dev_net(dev);
1787 static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1789 struct net_device *dev = to_net_dev(d);
1790 const struct net *net = dev_net(dev);
1792 net_ns_get_ownership(net, uid, gid);
1795 static struct class net_class __ro_after_init = {
1797 .dev_release = netdev_release,
1798 .dev_groups = net_class_groups,
1799 .dev_uevent = netdev_uevent,
1800 .ns_type = &net_ns_type_operations,
1801 .namespace = net_namespace,
1802 .get_ownership = net_get_ownership,
1805 #ifdef CONFIG_OF_NET
1806 static int of_dev_node_match(struct device *dev, const void *data)
1808 for (; dev; dev = dev->parent) {
1809 if (dev->of_node == data)
1817 * of_find_net_device_by_node - lookup the net device for the device node
1818 * @np: OF device node
1820 * Looks up the net_device structure corresponding with the device node.
1821 * If successful, returns a pointer to the net_device with the embedded
1822 * struct device refcount incremented by one, or NULL on failure. The
1823 * refcount must be dropped when done with the net_device.
1825 struct net_device *of_find_net_device_by_node(struct device_node *np)
1829 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1833 return to_net_dev(dev);
1835 EXPORT_SYMBOL(of_find_net_device_by_node);
1838 /* Delete sysfs entries but hold kobject reference until after all
1839 * netdev references are gone.
1841 void netdev_unregister_kobject(struct net_device *ndev)
1843 struct device *dev = &ndev->dev;
1845 if (!refcount_read(&dev_net(ndev)->count))
1846 dev_set_uevent_suppress(dev, 1);
1848 kobject_get(&dev->kobj);
1850 remove_queue_kobjects(ndev);
1852 pm_runtime_set_memalloc_noio(dev, false);
1857 /* Create sysfs entries for network device. */
1858 int netdev_register_kobject(struct net_device *ndev)
1860 struct device *dev = &ndev->dev;
1861 const struct attribute_group **groups = ndev->sysfs_groups;
1864 device_initialize(dev);
1865 dev->class = &net_class;
1866 dev->platform_data = ndev;
1867 dev->groups = groups;
1869 dev_set_name(dev, "%s", ndev->name);
1872 /* Allow for a device specific group */
1876 *groups++ = &netstat_group;
1878 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1879 if (ndev->ieee80211_ptr)
1880 *groups++ = &wireless_group;
1881 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1882 else if (ndev->wireless_handlers)
1883 *groups++ = &wireless_group;
1886 #endif /* CONFIG_SYSFS */
1888 error = device_add(dev);
1892 error = register_queue_kobjects(ndev);
1898 pm_runtime_set_memalloc_noio(dev, true);
1903 /* Change owner for sysfs entries when moving network devices across network
1904 * namespaces owned by different user namespaces.
1906 int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
1907 const struct net *net_new)
1909 struct device *dev = &ndev->dev;
1910 kuid_t old_uid, new_uid;
1911 kgid_t old_gid, new_gid;
1914 net_ns_get_ownership(net_old, &old_uid, &old_gid);
1915 net_ns_get_ownership(net_new, &new_uid, &new_gid);
1917 /* The network namespace was changed but the owning user namespace is
1918 * identical so there's no need to change the owner of sysfs entries.
1920 if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid))
1923 error = device_change_owner(dev, new_uid, new_gid);
1927 error = queue_change_owner(ndev, new_uid, new_gid);
1934 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1937 return class_create_file_ns(&net_class, class_attr, ns);
1939 EXPORT_SYMBOL(netdev_class_create_file_ns);
1941 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1944 class_remove_file_ns(&net_class, class_attr, ns);
1946 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1948 int __init netdev_kobject_init(void)
1950 kobj_ns_type_register(&net_ns_type_operations);
1951 return class_register(&net_class);