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 <linux/if_arp.h>
16 #include <linux/slab.h>
17 #include <linux/nsproxy.h>
19 #include <net/net_namespace.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/vmalloc.h>
22 #include <linux/export.h>
23 #include <linux/jiffies.h>
24 #include <linux/pm_runtime.h>
26 #include "net-sysfs.h"
29 static const char fmt_hex[] = "%#x\n";
30 static const char fmt_long_hex[] = "%#lx\n";
31 static const char fmt_dec[] = "%d\n";
32 static const char fmt_udec[] = "%u\n";
33 static const char fmt_ulong[] = "%lu\n";
34 static const char fmt_u64[] = "%llu\n";
36 static inline int dev_isalive(const struct net_device *dev)
38 return dev->reg_state <= NETREG_REGISTERED;
41 /* use same locking rules as GIF* ioctl's */
42 static ssize_t netdev_show(const struct device *dev,
43 struct device_attribute *attr, char *buf,
44 ssize_t (*format)(const struct net_device *, char *))
46 struct net_device *net = to_net_dev(dev);
47 ssize_t ret = -EINVAL;
49 read_lock(&dev_base_lock);
51 ret = (*format)(net, buf);
52 read_unlock(&dev_base_lock);
57 /* generate a show function for simple field */
58 #define NETDEVICE_SHOW(field, format_string) \
59 static ssize_t format_##field(const struct net_device *net, char *buf) \
61 return sprintf(buf, format_string, net->field); \
63 static ssize_t field##_show(struct device *dev, \
64 struct device_attribute *attr, char *buf) \
66 return netdev_show(dev, attr, buf, format_##field); \
69 #define NETDEVICE_SHOW_RO(field, format_string) \
70 NETDEVICE_SHOW(field, format_string); \
71 static DEVICE_ATTR_RO(field)
73 #define NETDEVICE_SHOW_RW(field, format_string) \
74 NETDEVICE_SHOW(field, format_string); \
75 static DEVICE_ATTR_RW(field)
77 /* use same locking and permission rules as SIF* ioctl's */
78 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
79 const char *buf, size_t len,
80 int (*set)(struct net_device *, unsigned long))
82 struct net_device *netdev = to_net_dev(dev);
83 struct net *net = dev_net(netdev);
87 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
90 ret = kstrtoul(buf, 0, &new);
95 return restart_syscall();
97 if (dev_isalive(netdev)) {
98 if ((ret = (*set)(netdev, new)) == 0)
106 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
107 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
108 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
109 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
110 NETDEVICE_SHOW_RO(iflink, 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 /* use same locking rules as GIFHWADDR ioctl's */
116 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
119 struct net_device *net = to_net_dev(dev);
120 ssize_t ret = -EINVAL;
122 read_lock(&dev_base_lock);
123 if (dev_isalive(net))
124 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
125 read_unlock(&dev_base_lock);
128 static DEVICE_ATTR_RO(address);
130 static ssize_t broadcast_show(struct device *dev,
131 struct device_attribute *attr, char *buf)
133 struct net_device *net = to_net_dev(dev);
134 if (dev_isalive(net))
135 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
138 static DEVICE_ATTR_RO(broadcast);
140 static int change_carrier(struct net_device *net, unsigned long new_carrier)
142 if (!netif_running(net))
144 return dev_change_carrier(net, (bool) new_carrier);
147 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
148 const char *buf, size_t len)
150 return netdev_store(dev, attr, buf, len, change_carrier);
153 static ssize_t carrier_show(struct device *dev,
154 struct device_attribute *attr, char *buf)
156 struct net_device *netdev = to_net_dev(dev);
157 if (netif_running(netdev)) {
158 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
162 static DEVICE_ATTR_RW(carrier);
164 static ssize_t speed_show(struct device *dev,
165 struct device_attribute *attr, char *buf)
167 struct net_device *netdev = to_net_dev(dev);
171 return restart_syscall();
173 if (netif_running(netdev)) {
174 struct ethtool_cmd cmd;
175 if (!__ethtool_get_settings(netdev, &cmd))
176 ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
181 static DEVICE_ATTR_RO(speed);
183 static ssize_t duplex_show(struct device *dev,
184 struct device_attribute *attr, char *buf)
186 struct net_device *netdev = to_net_dev(dev);
190 return restart_syscall();
192 if (netif_running(netdev)) {
193 struct ethtool_cmd cmd;
194 if (!__ethtool_get_settings(netdev, &cmd)) {
196 switch (cmd.duplex) {
207 ret = sprintf(buf, "%s\n", duplex);
213 static DEVICE_ATTR_RO(duplex);
215 static ssize_t dormant_show(struct device *dev,
216 struct device_attribute *attr, char *buf)
218 struct net_device *netdev = to_net_dev(dev);
220 if (netif_running(netdev))
221 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
225 static DEVICE_ATTR_RO(dormant);
227 static const char *const operstates[] = {
229 "notpresent", /* currently unused */
232 "testing", /* currently unused */
237 static ssize_t operstate_show(struct device *dev,
238 struct device_attribute *attr, char *buf)
240 const struct net_device *netdev = to_net_dev(dev);
241 unsigned char operstate;
243 read_lock(&dev_base_lock);
244 operstate = netdev->operstate;
245 if (!netif_running(netdev))
246 operstate = IF_OPER_DOWN;
247 read_unlock(&dev_base_lock);
249 if (operstate >= ARRAY_SIZE(operstates))
250 return -EINVAL; /* should not happen */
252 return sprintf(buf, "%s\n", operstates[operstate]);
254 static DEVICE_ATTR_RO(operstate);
256 static ssize_t carrier_changes_show(struct device *dev,
257 struct device_attribute *attr,
260 struct net_device *netdev = to_net_dev(dev);
261 return sprintf(buf, fmt_dec,
262 atomic_read(&netdev->carrier_changes));
264 static DEVICE_ATTR_RO(carrier_changes);
266 /* read-write attributes */
268 static int change_mtu(struct net_device *net, unsigned long new_mtu)
270 return dev_set_mtu(net, (int) new_mtu);
273 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
274 const char *buf, size_t len)
276 return netdev_store(dev, attr, buf, len, change_mtu);
278 NETDEVICE_SHOW_RW(mtu, fmt_dec);
280 static int change_flags(struct net_device *net, unsigned long new_flags)
282 return dev_change_flags(net, (unsigned int) new_flags);
285 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
286 const char *buf, size_t len)
288 return netdev_store(dev, attr, buf, len, change_flags);
290 NETDEVICE_SHOW_RW(flags, fmt_hex);
292 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
294 net->tx_queue_len = new_len;
298 static ssize_t tx_queue_len_store(struct device *dev,
299 struct device_attribute *attr,
300 const char *buf, size_t len)
302 if (!capable(CAP_NET_ADMIN))
305 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
307 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
309 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
310 const char *buf, size_t len)
312 struct net_device *netdev = to_net_dev(dev);
313 struct net *net = dev_net(netdev);
317 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
320 /* ignore trailing newline */
321 if (len > 0 && buf[len - 1] == '\n')
325 return restart_syscall();
326 ret = dev_set_alias(netdev, buf, count);
329 return ret < 0 ? ret : len;
332 static ssize_t ifalias_show(struct device *dev,
333 struct device_attribute *attr, char *buf)
335 const struct net_device *netdev = to_net_dev(dev);
339 return restart_syscall();
341 ret = sprintf(buf, "%s\n", netdev->ifalias);
345 static DEVICE_ATTR_RW(ifalias);
347 static int change_group(struct net_device *net, unsigned long new_group)
349 dev_set_group(net, (int) new_group);
353 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
354 const char *buf, size_t len)
356 return netdev_store(dev, attr, buf, len, change_group);
358 NETDEVICE_SHOW(group, fmt_dec);
359 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
361 static ssize_t phys_port_id_show(struct device *dev,
362 struct device_attribute *attr, char *buf)
364 struct net_device *netdev = to_net_dev(dev);
365 ssize_t ret = -EINVAL;
368 return restart_syscall();
370 if (dev_isalive(netdev)) {
371 struct netdev_phys_port_id ppid;
373 ret = dev_get_phys_port_id(netdev, &ppid);
375 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
381 static DEVICE_ATTR_RO(phys_port_id);
383 static struct attribute *net_class_attrs[] = {
384 &dev_attr_netdev_group.attr,
386 &dev_attr_dev_id.attr,
387 &dev_attr_dev_port.attr,
388 &dev_attr_iflink.attr,
389 &dev_attr_ifindex.attr,
390 &dev_attr_addr_assign_type.attr,
391 &dev_attr_addr_len.attr,
392 &dev_attr_link_mode.attr,
393 &dev_attr_address.attr,
394 &dev_attr_broadcast.attr,
395 &dev_attr_speed.attr,
396 &dev_attr_duplex.attr,
397 &dev_attr_dormant.attr,
398 &dev_attr_operstate.attr,
399 &dev_attr_carrier_changes.attr,
400 &dev_attr_ifalias.attr,
401 &dev_attr_carrier.attr,
403 &dev_attr_flags.attr,
404 &dev_attr_tx_queue_len.attr,
405 &dev_attr_phys_port_id.attr,
408 ATTRIBUTE_GROUPS(net_class);
410 /* Show a given an attribute in the statistics group */
411 static ssize_t netstat_show(const struct device *d,
412 struct device_attribute *attr, char *buf,
413 unsigned long offset)
415 struct net_device *dev = to_net_dev(d);
416 ssize_t ret = -EINVAL;
418 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
419 offset % sizeof(u64) != 0);
421 read_lock(&dev_base_lock);
422 if (dev_isalive(dev)) {
423 struct rtnl_link_stats64 temp;
424 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
426 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
428 read_unlock(&dev_base_lock);
432 /* generate a read-only statistics attribute */
433 #define NETSTAT_ENTRY(name) \
434 static ssize_t name##_show(struct device *d, \
435 struct device_attribute *attr, char *buf) \
437 return netstat_show(d, attr, buf, \
438 offsetof(struct rtnl_link_stats64, name)); \
440 static DEVICE_ATTR_RO(name)
442 NETSTAT_ENTRY(rx_packets);
443 NETSTAT_ENTRY(tx_packets);
444 NETSTAT_ENTRY(rx_bytes);
445 NETSTAT_ENTRY(tx_bytes);
446 NETSTAT_ENTRY(rx_errors);
447 NETSTAT_ENTRY(tx_errors);
448 NETSTAT_ENTRY(rx_dropped);
449 NETSTAT_ENTRY(tx_dropped);
450 NETSTAT_ENTRY(multicast);
451 NETSTAT_ENTRY(collisions);
452 NETSTAT_ENTRY(rx_length_errors);
453 NETSTAT_ENTRY(rx_over_errors);
454 NETSTAT_ENTRY(rx_crc_errors);
455 NETSTAT_ENTRY(rx_frame_errors);
456 NETSTAT_ENTRY(rx_fifo_errors);
457 NETSTAT_ENTRY(rx_missed_errors);
458 NETSTAT_ENTRY(tx_aborted_errors);
459 NETSTAT_ENTRY(tx_carrier_errors);
460 NETSTAT_ENTRY(tx_fifo_errors);
461 NETSTAT_ENTRY(tx_heartbeat_errors);
462 NETSTAT_ENTRY(tx_window_errors);
463 NETSTAT_ENTRY(rx_compressed);
464 NETSTAT_ENTRY(tx_compressed);
466 static struct attribute *netstat_attrs[] = {
467 &dev_attr_rx_packets.attr,
468 &dev_attr_tx_packets.attr,
469 &dev_attr_rx_bytes.attr,
470 &dev_attr_tx_bytes.attr,
471 &dev_attr_rx_errors.attr,
472 &dev_attr_tx_errors.attr,
473 &dev_attr_rx_dropped.attr,
474 &dev_attr_tx_dropped.attr,
475 &dev_attr_multicast.attr,
476 &dev_attr_collisions.attr,
477 &dev_attr_rx_length_errors.attr,
478 &dev_attr_rx_over_errors.attr,
479 &dev_attr_rx_crc_errors.attr,
480 &dev_attr_rx_frame_errors.attr,
481 &dev_attr_rx_fifo_errors.attr,
482 &dev_attr_rx_missed_errors.attr,
483 &dev_attr_tx_aborted_errors.attr,
484 &dev_attr_tx_carrier_errors.attr,
485 &dev_attr_tx_fifo_errors.attr,
486 &dev_attr_tx_heartbeat_errors.attr,
487 &dev_attr_tx_window_errors.attr,
488 &dev_attr_rx_compressed.attr,
489 &dev_attr_tx_compressed.attr,
494 static struct attribute_group netstat_group = {
495 .name = "statistics",
496 .attrs = netstat_attrs,
499 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
500 static struct attribute *wireless_attrs[] = {
504 static struct attribute_group wireless_group = {
506 .attrs = wireless_attrs,
510 #else /* CONFIG_SYSFS */
511 #define net_class_groups NULL
512 #endif /* CONFIG_SYSFS */
515 #define to_rx_queue_attr(_attr) container_of(_attr, \
516 struct rx_queue_attribute, attr)
518 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
520 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
523 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
524 struct netdev_rx_queue *queue = to_rx_queue(kobj);
526 if (!attribute->show)
529 return attribute->show(queue, attribute, buf);
532 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
533 const char *buf, size_t count)
535 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
536 struct netdev_rx_queue *queue = to_rx_queue(kobj);
538 if (!attribute->store)
541 return attribute->store(queue, attribute, buf, count);
544 static const struct sysfs_ops rx_queue_sysfs_ops = {
545 .show = rx_queue_attr_show,
546 .store = rx_queue_attr_store,
550 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
551 struct rx_queue_attribute *attribute, char *buf)
558 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
562 map = rcu_dereference(queue->rps_map);
564 for (i = 0; i < map->len; i++)
565 cpumask_set_cpu(map->cpus[i], mask);
567 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
568 if (PAGE_SIZE - len < 3) {
570 free_cpumask_var(mask);
575 free_cpumask_var(mask);
576 len += sprintf(buf + len, "\n");
580 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
581 struct rx_queue_attribute *attribute,
582 const char *buf, size_t len)
584 struct rps_map *old_map, *map;
587 static DEFINE_SPINLOCK(rps_map_lock);
589 if (!capable(CAP_NET_ADMIN))
592 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
595 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
597 free_cpumask_var(mask);
601 map = kzalloc(max_t(unsigned int,
602 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
605 free_cpumask_var(mask);
610 for_each_cpu_and(cpu, mask, cpu_online_mask)
611 map->cpus[i++] = cpu;
620 spin_lock(&rps_map_lock);
621 old_map = rcu_dereference_protected(queue->rps_map,
622 lockdep_is_held(&rps_map_lock));
623 rcu_assign_pointer(queue->rps_map, map);
624 spin_unlock(&rps_map_lock);
627 static_key_slow_inc(&rps_needed);
629 kfree_rcu(old_map, rcu);
630 static_key_slow_dec(&rps_needed);
632 free_cpumask_var(mask);
636 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
637 struct rx_queue_attribute *attr,
640 struct rps_dev_flow_table *flow_table;
641 unsigned long val = 0;
644 flow_table = rcu_dereference(queue->rps_flow_table);
646 val = (unsigned long)flow_table->mask + 1;
649 return sprintf(buf, "%lu\n", val);
652 static void rps_dev_flow_table_release(struct rcu_head *rcu)
654 struct rps_dev_flow_table *table = container_of(rcu,
655 struct rps_dev_flow_table, rcu);
659 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
660 struct rx_queue_attribute *attr,
661 const char *buf, size_t len)
663 unsigned long mask, count;
664 struct rps_dev_flow_table *table, *old_table;
665 static DEFINE_SPINLOCK(rps_dev_flow_lock);
668 if (!capable(CAP_NET_ADMIN))
671 rc = kstrtoul(buf, 0, &count);
677 /* mask = roundup_pow_of_two(count) - 1;
678 * without overflows...
680 while ((mask | (mask >> 1)) != mask)
682 /* On 64 bit arches, must check mask fits in table->mask (u32),
683 * and on 32bit arches, must check
684 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
686 #if BITS_PER_LONG > 32
687 if (mask > (unsigned long)(u32)mask)
690 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
691 / sizeof(struct rps_dev_flow)) {
692 /* Enforce a limit to prevent overflow */
696 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
701 for (count = 0; count <= mask; count++)
702 table->flows[count].cpu = RPS_NO_CPU;
706 spin_lock(&rps_dev_flow_lock);
707 old_table = rcu_dereference_protected(queue->rps_flow_table,
708 lockdep_is_held(&rps_dev_flow_lock));
709 rcu_assign_pointer(queue->rps_flow_table, table);
710 spin_unlock(&rps_dev_flow_lock);
713 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
718 static struct rx_queue_attribute rps_cpus_attribute =
719 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
722 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
723 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
724 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
725 #endif /* CONFIG_RPS */
727 static struct attribute *rx_queue_default_attrs[] = {
729 &rps_cpus_attribute.attr,
730 &rps_dev_flow_table_cnt_attribute.attr,
735 static void rx_queue_release(struct kobject *kobj)
737 struct netdev_rx_queue *queue = to_rx_queue(kobj);
740 struct rps_dev_flow_table *flow_table;
743 map = rcu_dereference_protected(queue->rps_map, 1);
745 RCU_INIT_POINTER(queue->rps_map, NULL);
749 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
751 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
752 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
756 memset(kobj, 0, sizeof(*kobj));
760 static const void *rx_queue_namespace(struct kobject *kobj)
762 struct netdev_rx_queue *queue = to_rx_queue(kobj);
763 struct device *dev = &queue->dev->dev;
764 const void *ns = NULL;
766 if (dev->class && dev->class->ns_type)
767 ns = dev->class->namespace(dev);
772 static struct kobj_type rx_queue_ktype = {
773 .sysfs_ops = &rx_queue_sysfs_ops,
774 .release = rx_queue_release,
775 .default_attrs = rx_queue_default_attrs,
776 .namespace = rx_queue_namespace
779 static int rx_queue_add_kobject(struct net_device *net, int index)
781 struct netdev_rx_queue *queue = net->_rx + index;
782 struct kobject *kobj = &queue->kobj;
785 kobj->kset = net->queues_kset;
786 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
791 if (net->sysfs_rx_queue_group) {
792 error = sysfs_create_group(kobj, net->sysfs_rx_queue_group);
797 kobject_uevent(kobj, KOBJ_ADD);
798 dev_hold(queue->dev);
805 #endif /* CONFIG_SYSFS */
808 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
815 if (!net->sysfs_rx_queue_group)
818 for (i = old_num; i < new_num; i++) {
819 error = rx_queue_add_kobject(net, i);
826 while (--i >= new_num) {
827 if (net->sysfs_rx_queue_group)
828 sysfs_remove_group(&net->_rx[i].kobj,
829 net->sysfs_rx_queue_group);
830 kobject_put(&net->_rx[i].kobj);
841 * netdev_queue sysfs structures and functions.
843 struct netdev_queue_attribute {
844 struct attribute attr;
845 ssize_t (*show)(struct netdev_queue *queue,
846 struct netdev_queue_attribute *attr, char *buf);
847 ssize_t (*store)(struct netdev_queue *queue,
848 struct netdev_queue_attribute *attr, const char *buf, size_t len);
850 #define to_netdev_queue_attr(_attr) container_of(_attr, \
851 struct netdev_queue_attribute, attr)
853 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
855 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
856 struct attribute *attr, char *buf)
858 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
859 struct netdev_queue *queue = to_netdev_queue(kobj);
861 if (!attribute->show)
864 return attribute->show(queue, attribute, buf);
867 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
868 struct attribute *attr,
869 const char *buf, size_t count)
871 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
872 struct netdev_queue *queue = to_netdev_queue(kobj);
874 if (!attribute->store)
877 return attribute->store(queue, attribute, buf, count);
880 static const struct sysfs_ops netdev_queue_sysfs_ops = {
881 .show = netdev_queue_attr_show,
882 .store = netdev_queue_attr_store,
885 static ssize_t show_trans_timeout(struct netdev_queue *queue,
886 struct netdev_queue_attribute *attribute,
889 unsigned long trans_timeout;
891 spin_lock_irq(&queue->_xmit_lock);
892 trans_timeout = queue->trans_timeout;
893 spin_unlock_irq(&queue->_xmit_lock);
895 return sprintf(buf, "%lu", trans_timeout);
898 static struct netdev_queue_attribute queue_trans_timeout =
899 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
903 * Byte queue limits sysfs structures and functions.
905 static ssize_t bql_show(char *buf, unsigned int value)
907 return sprintf(buf, "%u\n", value);
910 static ssize_t bql_set(const char *buf, const size_t count,
911 unsigned int *pvalue)
916 if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
917 value = DQL_MAX_LIMIT;
919 err = kstrtouint(buf, 10, &value);
922 if (value > DQL_MAX_LIMIT)
931 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
932 struct netdev_queue_attribute *attr,
935 struct dql *dql = &queue->dql;
937 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
940 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
941 struct netdev_queue_attribute *attribute,
942 const char *buf, size_t len)
944 struct dql *dql = &queue->dql;
948 err = kstrtouint(buf, 10, &value);
952 dql->slack_hold_time = msecs_to_jiffies(value);
957 static struct netdev_queue_attribute bql_hold_time_attribute =
958 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
961 static ssize_t bql_show_inflight(struct netdev_queue *queue,
962 struct netdev_queue_attribute *attr,
965 struct dql *dql = &queue->dql;
967 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
970 static struct netdev_queue_attribute bql_inflight_attribute =
971 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
973 #define BQL_ATTR(NAME, FIELD) \
974 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
975 struct netdev_queue_attribute *attr, \
978 return bql_show(buf, queue->dql.FIELD); \
981 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
982 struct netdev_queue_attribute *attr, \
983 const char *buf, size_t len) \
985 return bql_set(buf, len, &queue->dql.FIELD); \
988 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \
989 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \
992 BQL_ATTR(limit, limit)
993 BQL_ATTR(limit_max, max_limit)
994 BQL_ATTR(limit_min, min_limit)
996 static struct attribute *dql_attrs[] = {
997 &bql_limit_attribute.attr,
998 &bql_limit_max_attribute.attr,
999 &bql_limit_min_attribute.attr,
1000 &bql_hold_time_attribute.attr,
1001 &bql_inflight_attribute.attr,
1005 static struct attribute_group dql_group = {
1006 .name = "byte_queue_limits",
1009 #endif /* CONFIG_BQL */
1012 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1014 struct net_device *dev = queue->dev;
1017 i = queue - dev->_tx;
1018 BUG_ON(i >= dev->num_tx_queues);
1024 static ssize_t show_xps_map(struct netdev_queue *queue,
1025 struct netdev_queue_attribute *attribute, char *buf)
1027 struct net_device *dev = queue->dev;
1028 struct xps_dev_maps *dev_maps;
1030 unsigned long index;
1034 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1037 index = get_netdev_queue_index(queue);
1040 dev_maps = rcu_dereference(dev->xps_maps);
1042 for_each_possible_cpu(i) {
1043 struct xps_map *map =
1044 rcu_dereference(dev_maps->cpu_map[i]);
1047 for (j = 0; j < map->len; j++) {
1048 if (map->queues[j] == index) {
1049 cpumask_set_cpu(i, mask);
1058 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
1059 if (PAGE_SIZE - len < 3) {
1060 free_cpumask_var(mask);
1064 free_cpumask_var(mask);
1065 len += sprintf(buf + len, "\n");
1069 static ssize_t store_xps_map(struct netdev_queue *queue,
1070 struct netdev_queue_attribute *attribute,
1071 const char *buf, size_t len)
1073 struct net_device *dev = queue->dev;
1074 unsigned long index;
1078 if (!capable(CAP_NET_ADMIN))
1081 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1084 index = get_netdev_queue_index(queue);
1086 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1088 free_cpumask_var(mask);
1092 err = netif_set_xps_queue(dev, mask, index);
1094 free_cpumask_var(mask);
1099 static struct netdev_queue_attribute xps_cpus_attribute =
1100 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1101 #endif /* CONFIG_XPS */
1103 static struct attribute *netdev_queue_default_attrs[] = {
1104 &queue_trans_timeout.attr,
1106 &xps_cpus_attribute.attr,
1111 static void netdev_queue_release(struct kobject *kobj)
1113 struct netdev_queue *queue = to_netdev_queue(kobj);
1115 memset(kobj, 0, sizeof(*kobj));
1116 dev_put(queue->dev);
1119 static const void *netdev_queue_namespace(struct kobject *kobj)
1121 struct netdev_queue *queue = to_netdev_queue(kobj);
1122 struct device *dev = &queue->dev->dev;
1123 const void *ns = NULL;
1125 if (dev->class && dev->class->ns_type)
1126 ns = dev->class->namespace(dev);
1131 static struct kobj_type netdev_queue_ktype = {
1132 .sysfs_ops = &netdev_queue_sysfs_ops,
1133 .release = netdev_queue_release,
1134 .default_attrs = netdev_queue_default_attrs,
1135 .namespace = netdev_queue_namespace,
1138 static int netdev_queue_add_kobject(struct net_device *net, int index)
1140 struct netdev_queue *queue = net->_tx + index;
1141 struct kobject *kobj = &queue->kobj;
1144 kobj->kset = net->queues_kset;
1145 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1151 error = sysfs_create_group(kobj, &dql_group);
1156 kobject_uevent(kobj, KOBJ_ADD);
1157 dev_hold(queue->dev);
1164 #endif /* CONFIG_SYSFS */
1167 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1173 for (i = old_num; i < new_num; i++) {
1174 error = netdev_queue_add_kobject(net, i);
1181 while (--i >= new_num) {
1182 struct netdev_queue *queue = net->_tx + i;
1185 sysfs_remove_group(&queue->kobj, &dql_group);
1187 kobject_put(&queue->kobj);
1193 #endif /* CONFIG_SYSFS */
1196 static int register_queue_kobjects(struct net_device *net)
1198 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1201 net->queues_kset = kset_create_and_add("queues",
1202 NULL, &net->dev.kobj);
1203 if (!net->queues_kset)
1205 real_rx = net->real_num_rx_queues;
1207 real_tx = net->real_num_tx_queues;
1209 error = net_rx_queue_update_kobjects(net, 0, real_rx);
1214 error = netdev_queue_update_kobjects(net, 0, real_tx);
1222 netdev_queue_update_kobjects(net, txq, 0);
1223 net_rx_queue_update_kobjects(net, rxq, 0);
1227 static void remove_queue_kobjects(struct net_device *net)
1229 int real_rx = 0, real_tx = 0;
1232 real_rx = net->real_num_rx_queues;
1234 real_tx = net->real_num_tx_queues;
1236 net_rx_queue_update_kobjects(net, real_rx, 0);
1237 netdev_queue_update_kobjects(net, real_tx, 0);
1239 kset_unregister(net->queues_kset);
1243 static bool net_current_may_mount(void)
1245 struct net *net = current->nsproxy->net_ns;
1247 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1250 static void *net_grab_current_ns(void)
1252 struct net *ns = current->nsproxy->net_ns;
1253 #ifdef CONFIG_NET_NS
1255 atomic_inc(&ns->passive);
1260 static const void *net_initial_ns(void)
1265 static const void *net_netlink_ns(struct sock *sk)
1267 return sock_net(sk);
1270 struct kobj_ns_type_operations net_ns_type_operations = {
1271 .type = KOBJ_NS_TYPE_NET,
1272 .current_may_mount = net_current_may_mount,
1273 .grab_current_ns = net_grab_current_ns,
1274 .netlink_ns = net_netlink_ns,
1275 .initial_ns = net_initial_ns,
1276 .drop_ns = net_drop_ns,
1278 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1280 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1282 struct net_device *dev = to_net_dev(d);
1285 /* pass interface to uevent. */
1286 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1290 /* pass ifindex to uevent.
1291 * ifindex is useful as it won't change (interface name may change)
1292 * and is what RtNetlink uses natively. */
1293 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1300 * netdev_release -- destroy and free a dead device.
1301 * Called when last reference to device kobject is gone.
1303 static void netdev_release(struct device *d)
1305 struct net_device *dev = to_net_dev(d);
1307 BUG_ON(dev->reg_state != NETREG_RELEASED);
1309 kfree(dev->ifalias);
1310 netdev_freemem(dev);
1313 static const void *net_namespace(struct device *d)
1315 struct net_device *dev;
1316 dev = container_of(d, struct net_device, dev);
1317 return dev_net(dev);
1320 static struct class net_class = {
1322 .dev_release = netdev_release,
1323 .dev_groups = net_class_groups,
1324 .dev_uevent = netdev_uevent,
1325 .ns_type = &net_ns_type_operations,
1326 .namespace = net_namespace,
1329 /* Delete sysfs entries but hold kobject reference until after all
1330 * netdev references are gone.
1332 void netdev_unregister_kobject(struct net_device * net)
1334 struct device *dev = &(net->dev);
1336 kobject_get(&dev->kobj);
1338 remove_queue_kobjects(net);
1340 pm_runtime_set_memalloc_noio(dev, false);
1345 /* Create sysfs entries for network device. */
1346 int netdev_register_kobject(struct net_device *net)
1348 struct device *dev = &(net->dev);
1349 const struct attribute_group **groups = net->sysfs_groups;
1352 device_initialize(dev);
1353 dev->class = &net_class;
1354 dev->platform_data = net;
1355 dev->groups = groups;
1357 dev_set_name(dev, "%s", net->name);
1360 /* Allow for a device specific group */
1364 *groups++ = &netstat_group;
1366 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1367 if (net->ieee80211_ptr)
1368 *groups++ = &wireless_group;
1369 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1370 else if (net->wireless_handlers)
1371 *groups++ = &wireless_group;
1374 #endif /* CONFIG_SYSFS */
1376 error = device_add(dev);
1380 error = register_queue_kobjects(net);
1386 pm_runtime_set_memalloc_noio(dev, true);
1391 int netdev_class_create_file_ns(struct class_attribute *class_attr,
1394 return class_create_file_ns(&net_class, class_attr, ns);
1396 EXPORT_SYMBOL(netdev_class_create_file_ns);
1398 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1401 class_remove_file_ns(&net_class, class_attr, ns);
1403 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1405 int __init netdev_kobject_init(void)
1407 kobj_ns_type_register(&net_ns_type_operations);
1408 return class_register(&net_class);