2 * net-sysfs.c - network device class and attributes
4 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/capability.h>
13 #include <linux/kernel.h>
14 #include <linux/netdevice.h>
15 #include <net/switchdev.h>
16 #include <linux/if_arp.h>
17 #include <linux/slab.h>
18 #include <linux/nsproxy.h>
20 #include <net/net_namespace.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/vmalloc.h>
23 #include <linux/export.h>
24 #include <linux/jiffies.h>
25 #include <linux/pm_runtime.h>
27 #include <linux/of_net.h>
29 #include "net-sysfs.h"
32 static const char fmt_hex[] = "%#x\n";
33 static const char fmt_dec[] = "%d\n";
34 static const char fmt_ulong[] = "%lu\n";
35 static const char fmt_u64[] = "%llu\n";
37 static inline int dev_isalive(const struct net_device *dev)
39 return dev->reg_state <= NETREG_REGISTERED;
42 /* use same locking rules as GIF* ioctl's */
43 static ssize_t netdev_show(const struct device *dev,
44 struct device_attribute *attr, char *buf,
45 ssize_t (*format)(const struct net_device *, char *))
47 struct net_device *ndev = to_net_dev(dev);
48 ssize_t ret = -EINVAL;
50 read_lock(&dev_base_lock);
51 if (dev_isalive(ndev))
52 ret = (*format)(ndev, buf);
53 read_unlock(&dev_base_lock);
58 /* generate a show function for simple field */
59 #define NETDEVICE_SHOW(field, format_string) \
60 static ssize_t format_##field(const struct net_device *dev, char *buf) \
62 return sprintf(buf, format_string, dev->field); \
64 static ssize_t field##_show(struct device *dev, \
65 struct device_attribute *attr, char *buf) \
67 return netdev_show(dev, attr, buf, format_##field); \
70 #define NETDEVICE_SHOW_RO(field, format_string) \
71 NETDEVICE_SHOW(field, format_string); \
72 static DEVICE_ATTR_RO(field)
74 #define NETDEVICE_SHOW_RW(field, format_string) \
75 NETDEVICE_SHOW(field, format_string); \
76 static DEVICE_ATTR_RW(field)
78 /* use same locking and permission rules as SIF* ioctl's */
79 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
80 const char *buf, size_t len,
81 int (*set)(struct net_device *, unsigned long))
83 struct net_device *netdev = to_net_dev(dev);
84 struct net *net = dev_net(netdev);
88 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
91 ret = kstrtoul(buf, 0, &new);
96 return restart_syscall();
98 if (dev_isalive(netdev)) {
99 if ((ret = (*set)(netdev, new)) == 0)
107 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
108 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
109 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
110 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
111 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
112 NETDEVICE_SHOW_RO(type, fmt_dec);
113 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
115 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
118 struct net_device *ndev = to_net_dev(dev);
120 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
122 static DEVICE_ATTR_RO(iflink);
124 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
126 return sprintf(buf, fmt_dec, dev->name_assign_type);
129 static ssize_t name_assign_type_show(struct device *dev,
130 struct device_attribute *attr,
133 struct net_device *ndev = to_net_dev(dev);
134 ssize_t ret = -EINVAL;
136 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
137 ret = netdev_show(dev, attr, buf, format_name_assign_type);
141 static DEVICE_ATTR_RO(name_assign_type);
143 /* use same locking rules as GIFHWADDR ioctl's */
144 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
147 struct net_device *ndev = to_net_dev(dev);
148 ssize_t ret = -EINVAL;
150 read_lock(&dev_base_lock);
151 if (dev_isalive(ndev))
152 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
153 read_unlock(&dev_base_lock);
156 static DEVICE_ATTR_RO(address);
158 static ssize_t broadcast_show(struct device *dev,
159 struct device_attribute *attr, char *buf)
161 struct net_device *ndev = to_net_dev(dev);
162 if (dev_isalive(ndev))
163 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
166 static DEVICE_ATTR_RO(broadcast);
168 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
170 if (!netif_running(dev))
172 return dev_change_carrier(dev, (bool) new_carrier);
175 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
176 const char *buf, size_t len)
178 return netdev_store(dev, attr, buf, len, change_carrier);
181 static ssize_t carrier_show(struct device *dev,
182 struct device_attribute *attr, char *buf)
184 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 dormant_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_dormant(netdev));
256 static DEVICE_ATTR_RO(dormant);
258 static const char *const operstates[] = {
260 "notpresent", /* currently unused */
263 "testing", /* currently unused */
268 static ssize_t operstate_show(struct device *dev,
269 struct device_attribute *attr, char *buf)
271 const struct net_device *netdev = to_net_dev(dev);
272 unsigned char operstate;
274 read_lock(&dev_base_lock);
275 operstate = netdev->operstate;
276 if (!netif_running(netdev))
277 operstate = IF_OPER_DOWN;
278 read_unlock(&dev_base_lock);
280 if (operstate >= ARRAY_SIZE(operstates))
281 return -EINVAL; /* should not happen */
283 return sprintf(buf, "%s\n", operstates[operstate]);
285 static DEVICE_ATTR_RO(operstate);
287 static ssize_t carrier_changes_show(struct device *dev,
288 struct device_attribute *attr,
291 struct net_device *netdev = to_net_dev(dev);
292 return sprintf(buf, fmt_dec,
293 atomic_read(&netdev->carrier_changes));
295 static DEVICE_ATTR_RO(carrier_changes);
297 /* read-write attributes */
299 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
301 return dev_set_mtu(dev, (int) new_mtu);
304 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
305 const char *buf, size_t len)
307 return netdev_store(dev, attr, buf, len, change_mtu);
309 NETDEVICE_SHOW_RW(mtu, fmt_dec);
311 static int change_flags(struct net_device *dev, unsigned long new_flags)
313 return dev_change_flags(dev, (unsigned int) new_flags);
316 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
317 const char *buf, size_t len)
319 return netdev_store(dev, attr, buf, len, change_flags);
321 NETDEVICE_SHOW_RW(flags, fmt_hex);
323 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
325 int res, orig_len = dev->tx_queue_len;
327 if (new_len != orig_len) {
328 dev->tx_queue_len = new_len;
329 res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev);
330 res = notifier_to_errno(res);
333 "refused to change device tx_queue_len\n");
334 dev->tx_queue_len = orig_len;
342 static ssize_t tx_queue_len_store(struct device *dev,
343 struct device_attribute *attr,
344 const char *buf, size_t len)
346 if (!capable(CAP_NET_ADMIN))
349 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
351 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
353 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
355 dev->gro_flush_timeout = val;
359 static ssize_t gro_flush_timeout_store(struct device *dev,
360 struct device_attribute *attr,
361 const char *buf, size_t len)
363 if (!capable(CAP_NET_ADMIN))
366 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
368 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
370 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
371 const char *buf, size_t len)
373 struct net_device *netdev = to_net_dev(dev);
374 struct net *net = dev_net(netdev);
378 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
381 /* ignore trailing newline */
382 if (len > 0 && buf[len - 1] == '\n')
386 return restart_syscall();
387 ret = dev_set_alias(netdev, buf, count);
390 return ret < 0 ? ret : len;
393 static ssize_t ifalias_show(struct device *dev,
394 struct device_attribute *attr, char *buf)
396 const struct net_device *netdev = to_net_dev(dev);
400 return restart_syscall();
402 ret = sprintf(buf, "%s\n", netdev->ifalias);
406 static DEVICE_ATTR_RW(ifalias);
408 static int change_group(struct net_device *dev, unsigned long new_group)
410 dev_set_group(dev, (int) new_group);
414 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
415 const char *buf, size_t len)
417 return netdev_store(dev, attr, buf, len, change_group);
419 NETDEVICE_SHOW(group, fmt_dec);
420 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
422 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
424 return dev_change_proto_down(dev, (bool) proto_down);
427 static ssize_t proto_down_store(struct device *dev,
428 struct device_attribute *attr,
429 const char *buf, size_t len)
431 return netdev_store(dev, attr, buf, len, change_proto_down);
433 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
435 static ssize_t phys_port_id_show(struct device *dev,
436 struct device_attribute *attr, char *buf)
438 struct net_device *netdev = to_net_dev(dev);
439 ssize_t ret = -EINVAL;
442 return restart_syscall();
444 if (dev_isalive(netdev)) {
445 struct netdev_phys_item_id ppid;
447 ret = dev_get_phys_port_id(netdev, &ppid);
449 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
455 static DEVICE_ATTR_RO(phys_port_id);
457 static ssize_t phys_port_name_show(struct device *dev,
458 struct device_attribute *attr, char *buf)
460 struct net_device *netdev = to_net_dev(dev);
461 ssize_t ret = -EINVAL;
464 return restart_syscall();
466 if (dev_isalive(netdev)) {
469 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
471 ret = sprintf(buf, "%s\n", name);
477 static DEVICE_ATTR_RO(phys_port_name);
479 static ssize_t phys_switch_id_show(struct device *dev,
480 struct device_attribute *attr, char *buf)
482 struct net_device *netdev = to_net_dev(dev);
483 ssize_t ret = -EINVAL;
486 return restart_syscall();
488 if (dev_isalive(netdev)) {
489 struct switchdev_attr attr = {
491 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
492 .flags = SWITCHDEV_F_NO_RECURSE,
495 ret = switchdev_port_attr_get(netdev, &attr);
497 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
504 static DEVICE_ATTR_RO(phys_switch_id);
506 static struct attribute *net_class_attrs[] = {
507 &dev_attr_netdev_group.attr,
509 &dev_attr_dev_id.attr,
510 &dev_attr_dev_port.attr,
511 &dev_attr_iflink.attr,
512 &dev_attr_ifindex.attr,
513 &dev_attr_name_assign_type.attr,
514 &dev_attr_addr_assign_type.attr,
515 &dev_attr_addr_len.attr,
516 &dev_attr_link_mode.attr,
517 &dev_attr_address.attr,
518 &dev_attr_broadcast.attr,
519 &dev_attr_speed.attr,
520 &dev_attr_duplex.attr,
521 &dev_attr_dormant.attr,
522 &dev_attr_operstate.attr,
523 &dev_attr_carrier_changes.attr,
524 &dev_attr_ifalias.attr,
525 &dev_attr_carrier.attr,
527 &dev_attr_flags.attr,
528 &dev_attr_tx_queue_len.attr,
529 &dev_attr_gro_flush_timeout.attr,
530 &dev_attr_phys_port_id.attr,
531 &dev_attr_phys_port_name.attr,
532 &dev_attr_phys_switch_id.attr,
533 &dev_attr_proto_down.attr,
536 ATTRIBUTE_GROUPS(net_class);
538 /* Show a given an attribute in the statistics group */
539 static ssize_t netstat_show(const struct device *d,
540 struct device_attribute *attr, char *buf,
541 unsigned long offset)
543 struct net_device *dev = to_net_dev(d);
544 ssize_t ret = -EINVAL;
546 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
547 offset % sizeof(u64) != 0);
549 read_lock(&dev_base_lock);
550 if (dev_isalive(dev)) {
551 struct rtnl_link_stats64 temp;
552 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
554 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
556 read_unlock(&dev_base_lock);
560 /* generate a read-only statistics attribute */
561 #define NETSTAT_ENTRY(name) \
562 static ssize_t name##_show(struct device *d, \
563 struct device_attribute *attr, char *buf) \
565 return netstat_show(d, attr, buf, \
566 offsetof(struct rtnl_link_stats64, name)); \
568 static DEVICE_ATTR_RO(name)
570 NETSTAT_ENTRY(rx_packets);
571 NETSTAT_ENTRY(tx_packets);
572 NETSTAT_ENTRY(rx_bytes);
573 NETSTAT_ENTRY(tx_bytes);
574 NETSTAT_ENTRY(rx_errors);
575 NETSTAT_ENTRY(tx_errors);
576 NETSTAT_ENTRY(rx_dropped);
577 NETSTAT_ENTRY(tx_dropped);
578 NETSTAT_ENTRY(multicast);
579 NETSTAT_ENTRY(collisions);
580 NETSTAT_ENTRY(rx_length_errors);
581 NETSTAT_ENTRY(rx_over_errors);
582 NETSTAT_ENTRY(rx_crc_errors);
583 NETSTAT_ENTRY(rx_frame_errors);
584 NETSTAT_ENTRY(rx_fifo_errors);
585 NETSTAT_ENTRY(rx_missed_errors);
586 NETSTAT_ENTRY(tx_aborted_errors);
587 NETSTAT_ENTRY(tx_carrier_errors);
588 NETSTAT_ENTRY(tx_fifo_errors);
589 NETSTAT_ENTRY(tx_heartbeat_errors);
590 NETSTAT_ENTRY(tx_window_errors);
591 NETSTAT_ENTRY(rx_compressed);
592 NETSTAT_ENTRY(tx_compressed);
593 NETSTAT_ENTRY(rx_nohandler);
595 static struct attribute *netstat_attrs[] = {
596 &dev_attr_rx_packets.attr,
597 &dev_attr_tx_packets.attr,
598 &dev_attr_rx_bytes.attr,
599 &dev_attr_tx_bytes.attr,
600 &dev_attr_rx_errors.attr,
601 &dev_attr_tx_errors.attr,
602 &dev_attr_rx_dropped.attr,
603 &dev_attr_tx_dropped.attr,
604 &dev_attr_multicast.attr,
605 &dev_attr_collisions.attr,
606 &dev_attr_rx_length_errors.attr,
607 &dev_attr_rx_over_errors.attr,
608 &dev_attr_rx_crc_errors.attr,
609 &dev_attr_rx_frame_errors.attr,
610 &dev_attr_rx_fifo_errors.attr,
611 &dev_attr_rx_missed_errors.attr,
612 &dev_attr_tx_aborted_errors.attr,
613 &dev_attr_tx_carrier_errors.attr,
614 &dev_attr_tx_fifo_errors.attr,
615 &dev_attr_tx_heartbeat_errors.attr,
616 &dev_attr_tx_window_errors.attr,
617 &dev_attr_rx_compressed.attr,
618 &dev_attr_tx_compressed.attr,
619 &dev_attr_rx_nohandler.attr,
624 static struct attribute_group netstat_group = {
625 .name = "statistics",
626 .attrs = netstat_attrs,
629 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
630 static struct attribute *wireless_attrs[] = {
634 static struct attribute_group wireless_group = {
636 .attrs = wireless_attrs,
640 #else /* CONFIG_SYSFS */
641 #define net_class_groups NULL
642 #endif /* CONFIG_SYSFS */
645 #define to_rx_queue_attr(_attr) container_of(_attr, \
646 struct rx_queue_attribute, attr)
648 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
650 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
653 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
654 struct netdev_rx_queue *queue = to_rx_queue(kobj);
656 if (!attribute->show)
659 return attribute->show(queue, attribute, buf);
662 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
663 const char *buf, size_t count)
665 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
666 struct netdev_rx_queue *queue = to_rx_queue(kobj);
668 if (!attribute->store)
671 return attribute->store(queue, attribute, buf, count);
674 static const struct sysfs_ops rx_queue_sysfs_ops = {
675 .show = rx_queue_attr_show,
676 .store = rx_queue_attr_store,
680 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
681 struct rx_queue_attribute *attribute, char *buf)
687 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
691 map = rcu_dereference(queue->rps_map);
693 for (i = 0; i < map->len; i++)
694 cpumask_set_cpu(map->cpus[i], mask);
696 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
698 free_cpumask_var(mask);
700 return len < PAGE_SIZE ? len : -EINVAL;
703 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
704 struct rx_queue_attribute *attribute,
705 const char *buf, size_t len)
707 struct rps_map *old_map, *map;
710 static DEFINE_MUTEX(rps_map_mutex);
712 if (!capable(CAP_NET_ADMIN))
715 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
718 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
720 free_cpumask_var(mask);
724 map = kzalloc(max_t(unsigned int,
725 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
728 free_cpumask_var(mask);
733 for_each_cpu_and(cpu, mask, cpu_online_mask)
734 map->cpus[i++] = cpu;
743 mutex_lock(&rps_map_mutex);
744 old_map = rcu_dereference_protected(queue->rps_map,
745 mutex_is_locked(&rps_map_mutex));
746 rcu_assign_pointer(queue->rps_map, map);
749 static_key_slow_inc(&rps_needed);
751 static_key_slow_dec(&rps_needed);
753 mutex_unlock(&rps_map_mutex);
756 kfree_rcu(old_map, rcu);
758 free_cpumask_var(mask);
762 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
763 struct rx_queue_attribute *attr,
766 struct rps_dev_flow_table *flow_table;
767 unsigned long val = 0;
770 flow_table = rcu_dereference(queue->rps_flow_table);
772 val = (unsigned long)flow_table->mask + 1;
775 return sprintf(buf, "%lu\n", val);
778 static void rps_dev_flow_table_release(struct rcu_head *rcu)
780 struct rps_dev_flow_table *table = container_of(rcu,
781 struct rps_dev_flow_table, rcu);
785 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
786 struct rx_queue_attribute *attr,
787 const char *buf, size_t len)
789 unsigned long mask, count;
790 struct rps_dev_flow_table *table, *old_table;
791 static DEFINE_SPINLOCK(rps_dev_flow_lock);
794 if (!capable(CAP_NET_ADMIN))
797 rc = kstrtoul(buf, 0, &count);
803 /* mask = roundup_pow_of_two(count) - 1;
804 * without overflows...
806 while ((mask | (mask >> 1)) != mask)
808 /* On 64 bit arches, must check mask fits in table->mask (u32),
809 * and on 32bit arches, must check
810 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
812 #if BITS_PER_LONG > 32
813 if (mask > (unsigned long)(u32)mask)
816 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
817 / sizeof(struct rps_dev_flow)) {
818 /* Enforce a limit to prevent overflow */
822 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
827 for (count = 0; count <= mask; count++)
828 table->flows[count].cpu = RPS_NO_CPU;
832 spin_lock(&rps_dev_flow_lock);
833 old_table = rcu_dereference_protected(queue->rps_flow_table,
834 lockdep_is_held(&rps_dev_flow_lock));
835 rcu_assign_pointer(queue->rps_flow_table, table);
836 spin_unlock(&rps_dev_flow_lock);
839 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
844 static struct rx_queue_attribute rps_cpus_attribute =
845 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
848 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
849 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
850 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
851 #endif /* CONFIG_RPS */
853 static struct attribute *rx_queue_default_attrs[] = {
855 &rps_cpus_attribute.attr,
856 &rps_dev_flow_table_cnt_attribute.attr,
861 static void rx_queue_release(struct kobject *kobj)
863 struct netdev_rx_queue *queue = to_rx_queue(kobj);
866 struct rps_dev_flow_table *flow_table;
869 map = rcu_dereference_protected(queue->rps_map, 1);
871 RCU_INIT_POINTER(queue->rps_map, NULL);
875 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
877 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
878 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
882 memset(kobj, 0, sizeof(*kobj));
886 static const void *rx_queue_namespace(struct kobject *kobj)
888 struct netdev_rx_queue *queue = to_rx_queue(kobj);
889 struct device *dev = &queue->dev->dev;
890 const void *ns = NULL;
892 if (dev->class && dev->class->ns_type)
893 ns = dev->class->namespace(dev);
898 static struct kobj_type rx_queue_ktype = {
899 .sysfs_ops = &rx_queue_sysfs_ops,
900 .release = rx_queue_release,
901 .default_attrs = rx_queue_default_attrs,
902 .namespace = rx_queue_namespace
905 static int rx_queue_add_kobject(struct net_device *dev, int index)
907 struct netdev_rx_queue *queue = dev->_rx + index;
908 struct kobject *kobj = &queue->kobj;
911 kobj->kset = dev->queues_kset;
912 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
917 if (dev->sysfs_rx_queue_group) {
918 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
923 kobject_uevent(kobj, KOBJ_ADD);
924 dev_hold(queue->dev);
931 #endif /* CONFIG_SYSFS */
934 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
941 if (!dev->sysfs_rx_queue_group)
944 for (i = old_num; i < new_num; i++) {
945 error = rx_queue_add_kobject(dev, i);
952 while (--i >= new_num) {
953 struct kobject *kobj = &dev->_rx[i].kobj;
955 if (!list_empty(&dev_net(dev)->exit_list))
956 kobj->uevent_suppress = 1;
957 if (dev->sysfs_rx_queue_group)
958 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
970 * netdev_queue sysfs structures and functions.
972 struct netdev_queue_attribute {
973 struct attribute attr;
974 ssize_t (*show)(struct netdev_queue *queue,
975 struct netdev_queue_attribute *attr, char *buf);
976 ssize_t (*store)(struct netdev_queue *queue,
977 struct netdev_queue_attribute *attr, const char *buf, size_t len);
979 #define to_netdev_queue_attr(_attr) container_of(_attr, \
980 struct netdev_queue_attribute, attr)
982 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
984 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
985 struct attribute *attr, char *buf)
987 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
988 struct netdev_queue *queue = to_netdev_queue(kobj);
990 if (!attribute->show)
993 return attribute->show(queue, attribute, buf);
996 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
997 struct attribute *attr,
998 const char *buf, size_t count)
1000 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
1001 struct netdev_queue *queue = to_netdev_queue(kobj);
1003 if (!attribute->store)
1006 return attribute->store(queue, attribute, buf, count);
1009 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1010 .show = netdev_queue_attr_show,
1011 .store = netdev_queue_attr_store,
1014 static ssize_t show_trans_timeout(struct netdev_queue *queue,
1015 struct netdev_queue_attribute *attribute,
1018 unsigned long trans_timeout;
1020 spin_lock_irq(&queue->_xmit_lock);
1021 trans_timeout = queue->trans_timeout;
1022 spin_unlock_irq(&queue->_xmit_lock);
1024 return sprintf(buf, "%lu", trans_timeout);
1028 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1030 struct net_device *dev = queue->dev;
1033 i = queue - dev->_tx;
1034 BUG_ON(i >= dev->num_tx_queues);
1039 static ssize_t show_tx_maxrate(struct netdev_queue *queue,
1040 struct netdev_queue_attribute *attribute,
1043 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1046 static ssize_t set_tx_maxrate(struct netdev_queue *queue,
1047 struct netdev_queue_attribute *attribute,
1048 const char *buf, size_t len)
1050 struct net_device *dev = queue->dev;
1051 int err, index = get_netdev_queue_index(queue);
1054 err = kstrtou32(buf, 10, &rate);
1058 if (!rtnl_trylock())
1059 return restart_syscall();
1062 if (dev->netdev_ops->ndo_set_tx_maxrate)
1063 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1067 queue->tx_maxrate = rate;
1073 static struct netdev_queue_attribute queue_tx_maxrate =
1074 __ATTR(tx_maxrate, S_IRUGO | S_IWUSR,
1075 show_tx_maxrate, set_tx_maxrate);
1078 static struct netdev_queue_attribute queue_trans_timeout =
1079 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
1083 * Byte queue limits sysfs structures and functions.
1085 static ssize_t bql_show(char *buf, unsigned int value)
1087 return sprintf(buf, "%u\n", value);
1090 static ssize_t bql_set(const char *buf, const size_t count,
1091 unsigned int *pvalue)
1096 if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
1097 value = DQL_MAX_LIMIT;
1099 err = kstrtouint(buf, 10, &value);
1102 if (value > DQL_MAX_LIMIT)
1111 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1112 struct netdev_queue_attribute *attr,
1115 struct dql *dql = &queue->dql;
1117 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1120 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1121 struct netdev_queue_attribute *attribute,
1122 const char *buf, size_t len)
1124 struct dql *dql = &queue->dql;
1128 err = kstrtouint(buf, 10, &value);
1132 dql->slack_hold_time = msecs_to_jiffies(value);
1137 static struct netdev_queue_attribute bql_hold_time_attribute =
1138 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
1141 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1142 struct netdev_queue_attribute *attr,
1145 struct dql *dql = &queue->dql;
1147 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1150 static struct netdev_queue_attribute bql_inflight_attribute =
1151 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1153 #define BQL_ATTR(NAME, FIELD) \
1154 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1155 struct netdev_queue_attribute *attr, \
1158 return bql_show(buf, queue->dql.FIELD); \
1161 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1162 struct netdev_queue_attribute *attr, \
1163 const char *buf, size_t len) \
1165 return bql_set(buf, len, &queue->dql.FIELD); \
1168 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \
1169 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \
1172 BQL_ATTR(limit, limit)
1173 BQL_ATTR(limit_max, max_limit)
1174 BQL_ATTR(limit_min, min_limit)
1176 static struct attribute *dql_attrs[] = {
1177 &bql_limit_attribute.attr,
1178 &bql_limit_max_attribute.attr,
1179 &bql_limit_min_attribute.attr,
1180 &bql_hold_time_attribute.attr,
1181 &bql_inflight_attribute.attr,
1185 static struct attribute_group dql_group = {
1186 .name = "byte_queue_limits",
1189 #endif /* CONFIG_BQL */
1192 static ssize_t show_xps_map(struct netdev_queue *queue,
1193 struct netdev_queue_attribute *attribute, char *buf)
1195 struct net_device *dev = queue->dev;
1196 struct xps_dev_maps *dev_maps;
1198 unsigned long index;
1201 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1204 index = get_netdev_queue_index(queue);
1207 dev_maps = rcu_dereference(dev->xps_maps);
1209 for_each_possible_cpu(i) {
1210 struct xps_map *map =
1211 rcu_dereference(dev_maps->cpu_map[i]);
1214 for (j = 0; j < map->len; j++) {
1215 if (map->queues[j] == index) {
1216 cpumask_set_cpu(i, mask);
1225 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1226 free_cpumask_var(mask);
1227 return len < PAGE_SIZE ? len : -EINVAL;
1230 static ssize_t store_xps_map(struct netdev_queue *queue,
1231 struct netdev_queue_attribute *attribute,
1232 const char *buf, size_t len)
1234 struct net_device *dev = queue->dev;
1235 unsigned long index;
1239 if (!capable(CAP_NET_ADMIN))
1242 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1245 index = get_netdev_queue_index(queue);
1247 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1249 free_cpumask_var(mask);
1253 err = netif_set_xps_queue(dev, mask, index);
1255 free_cpumask_var(mask);
1260 static struct netdev_queue_attribute xps_cpus_attribute =
1261 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1262 #endif /* CONFIG_XPS */
1264 static struct attribute *netdev_queue_default_attrs[] = {
1265 &queue_trans_timeout.attr,
1267 &xps_cpus_attribute.attr,
1268 &queue_tx_maxrate.attr,
1273 static void netdev_queue_release(struct kobject *kobj)
1275 struct netdev_queue *queue = to_netdev_queue(kobj);
1277 memset(kobj, 0, sizeof(*kobj));
1278 dev_put(queue->dev);
1281 static const void *netdev_queue_namespace(struct kobject *kobj)
1283 struct netdev_queue *queue = to_netdev_queue(kobj);
1284 struct device *dev = &queue->dev->dev;
1285 const void *ns = NULL;
1287 if (dev->class && dev->class->ns_type)
1288 ns = dev->class->namespace(dev);
1293 static struct kobj_type netdev_queue_ktype = {
1294 .sysfs_ops = &netdev_queue_sysfs_ops,
1295 .release = netdev_queue_release,
1296 .default_attrs = netdev_queue_default_attrs,
1297 .namespace = netdev_queue_namespace,
1300 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1302 struct netdev_queue *queue = dev->_tx + index;
1303 struct kobject *kobj = &queue->kobj;
1306 kobj->kset = dev->queues_kset;
1307 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1313 error = sysfs_create_group(kobj, &dql_group);
1318 kobject_uevent(kobj, KOBJ_ADD);
1319 dev_hold(queue->dev);
1326 #endif /* CONFIG_SYSFS */
1329 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1335 for (i = old_num; i < new_num; i++) {
1336 error = netdev_queue_add_kobject(dev, i);
1343 while (--i >= new_num) {
1344 struct netdev_queue *queue = dev->_tx + i;
1346 if (!list_empty(&dev_net(dev)->exit_list))
1347 queue->kobj.uevent_suppress = 1;
1349 sysfs_remove_group(&queue->kobj, &dql_group);
1351 kobject_put(&queue->kobj);
1357 #endif /* CONFIG_SYSFS */
1360 static int register_queue_kobjects(struct net_device *dev)
1362 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1365 dev->queues_kset = kset_create_and_add("queues",
1366 NULL, &dev->dev.kobj);
1367 if (!dev->queues_kset)
1369 real_rx = dev->real_num_rx_queues;
1371 real_tx = dev->real_num_tx_queues;
1373 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1378 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1386 netdev_queue_update_kobjects(dev, txq, 0);
1387 net_rx_queue_update_kobjects(dev, rxq, 0);
1391 static void remove_queue_kobjects(struct net_device *dev)
1393 int real_rx = 0, real_tx = 0;
1396 real_rx = dev->real_num_rx_queues;
1398 real_tx = dev->real_num_tx_queues;
1400 net_rx_queue_update_kobjects(dev, real_rx, 0);
1401 netdev_queue_update_kobjects(dev, real_tx, 0);
1403 kset_unregister(dev->queues_kset);
1407 static bool net_current_may_mount(void)
1409 struct net *net = current->nsproxy->net_ns;
1411 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1414 static void *net_grab_current_ns(void)
1416 struct net *ns = current->nsproxy->net_ns;
1417 #ifdef CONFIG_NET_NS
1419 atomic_inc(&ns->passive);
1424 static const void *net_initial_ns(void)
1429 static const void *net_netlink_ns(struct sock *sk)
1431 return sock_net(sk);
1434 struct kobj_ns_type_operations net_ns_type_operations = {
1435 .type = KOBJ_NS_TYPE_NET,
1436 .current_may_mount = net_current_may_mount,
1437 .grab_current_ns = net_grab_current_ns,
1438 .netlink_ns = net_netlink_ns,
1439 .initial_ns = net_initial_ns,
1440 .drop_ns = net_drop_ns,
1442 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1444 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1446 struct net_device *dev = to_net_dev(d);
1449 /* pass interface to uevent. */
1450 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1454 /* pass ifindex to uevent.
1455 * ifindex is useful as it won't change (interface name may change)
1456 * and is what RtNetlink uses natively. */
1457 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1464 * netdev_release -- destroy and free a dead device.
1465 * Called when last reference to device kobject is gone.
1467 static void netdev_release(struct device *d)
1469 struct net_device *dev = to_net_dev(d);
1471 BUG_ON(dev->reg_state != NETREG_RELEASED);
1473 kfree(dev->ifalias);
1474 netdev_freemem(dev);
1477 static const void *net_namespace(struct device *d)
1479 struct net_device *dev = to_net_dev(d);
1481 return dev_net(dev);
1484 static struct class net_class = {
1486 .dev_release = netdev_release,
1487 .dev_groups = net_class_groups,
1488 .dev_uevent = netdev_uevent,
1489 .ns_type = &net_ns_type_operations,
1490 .namespace = net_namespace,
1493 #ifdef CONFIG_OF_NET
1494 static int of_dev_node_match(struct device *dev, const void *data)
1499 ret = dev->parent->of_node == data;
1501 return ret == 0 ? dev->of_node == data : ret;
1505 * of_find_net_device_by_node - lookup the net device for the device node
1506 * @np: OF device node
1508 * Looks up the net_device structure corresponding with the device node.
1509 * If successful, returns a pointer to the net_device with the embedded
1510 * struct device refcount incremented by one, or NULL on failure. The
1511 * refcount must be dropped when done with the net_device.
1513 struct net_device *of_find_net_device_by_node(struct device_node *np)
1517 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1521 return to_net_dev(dev);
1523 EXPORT_SYMBOL(of_find_net_device_by_node);
1526 /* Delete sysfs entries but hold kobject reference until after all
1527 * netdev references are gone.
1529 void netdev_unregister_kobject(struct net_device *ndev)
1531 struct device *dev = &(ndev->dev);
1533 if (!list_empty(&dev_net(ndev)->exit_list))
1534 dev_set_uevent_suppress(dev, 1);
1536 kobject_get(&dev->kobj);
1538 remove_queue_kobjects(ndev);
1540 pm_runtime_set_memalloc_noio(dev, false);
1545 /* Create sysfs entries for network device. */
1546 int netdev_register_kobject(struct net_device *ndev)
1548 struct device *dev = &(ndev->dev);
1549 const struct attribute_group **groups = ndev->sysfs_groups;
1552 device_initialize(dev);
1553 dev->class = &net_class;
1554 dev->platform_data = ndev;
1555 dev->groups = groups;
1557 dev_set_name(dev, "%s", ndev->name);
1560 /* Allow for a device specific group */
1564 *groups++ = &netstat_group;
1566 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1567 if (ndev->ieee80211_ptr)
1568 *groups++ = &wireless_group;
1569 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1570 else if (ndev->wireless_handlers)
1571 *groups++ = &wireless_group;
1574 #endif /* CONFIG_SYSFS */
1576 error = device_add(dev);
1580 error = register_queue_kobjects(ndev);
1586 pm_runtime_set_memalloc_noio(dev, true);
1591 int netdev_class_create_file_ns(struct class_attribute *class_attr,
1594 return class_create_file_ns(&net_class, class_attr, ns);
1596 EXPORT_SYMBOL(netdev_class_create_file_ns);
1598 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1601 class_remove_file_ns(&net_class, class_attr, ns);
1603 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1605 int __init netdev_kobject_init(void)
1607 kobj_ns_type_register(&net_ns_type_operations);
1608 return class_register(&net_class);