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>
25 #include "net-sysfs.h"
28 static const char fmt_hex[] = "%#x\n";
29 static const char fmt_long_hex[] = "%#lx\n";
30 static const char fmt_dec[] = "%d\n";
31 static const char fmt_udec[] = "%u\n";
32 static const char fmt_ulong[] = "%lu\n";
33 static const char fmt_u64[] = "%llu\n";
35 static inline int dev_isalive(const struct net_device *dev)
37 return dev->reg_state <= NETREG_REGISTERED;
40 /* use same locking rules as GIF* ioctl's */
41 static ssize_t netdev_show(const struct device *dev,
42 struct device_attribute *attr, char *buf,
43 ssize_t (*format)(const struct net_device *, char *))
45 struct net_device *net = to_net_dev(dev);
46 ssize_t ret = -EINVAL;
48 read_lock(&dev_base_lock);
50 ret = (*format)(net, buf);
51 read_unlock(&dev_base_lock);
56 /* generate a show function for simple field */
57 #define NETDEVICE_SHOW(field, format_string) \
58 static ssize_t format_##field(const struct net_device *net, char *buf) \
60 return sprintf(buf, format_string, net->field); \
62 static ssize_t show_##field(struct device *dev, \
63 struct device_attribute *attr, char *buf) \
65 return netdev_show(dev, attr, buf, format_##field); \
69 /* use same locking and permission rules as SIF* ioctl's */
70 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
71 const char *buf, size_t len,
72 int (*set)(struct net_device *, unsigned long))
74 struct net_device *netdev = to_net_dev(dev);
75 struct net *net = dev_net(netdev);
79 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
82 ret = kstrtoul(buf, 0, &new);
87 return restart_syscall();
89 if (dev_isalive(netdev)) {
90 if ((ret = (*set)(netdev, new)) == 0)
98 NETDEVICE_SHOW(dev_id, fmt_hex);
99 NETDEVICE_SHOW(addr_assign_type, fmt_dec);
100 NETDEVICE_SHOW(addr_len, fmt_dec);
101 NETDEVICE_SHOW(iflink, fmt_dec);
102 NETDEVICE_SHOW(ifindex, fmt_dec);
103 NETDEVICE_SHOW(type, fmt_dec);
104 NETDEVICE_SHOW(link_mode, fmt_dec);
106 /* use same locking rules as GIFHWADDR ioctl's */
107 static ssize_t show_address(struct device *dev, struct device_attribute *attr,
110 struct net_device *net = to_net_dev(dev);
111 ssize_t ret = -EINVAL;
113 read_lock(&dev_base_lock);
114 if (dev_isalive(net))
115 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
116 read_unlock(&dev_base_lock);
120 static ssize_t show_broadcast(struct device *dev,
121 struct device_attribute *attr, char *buf)
123 struct net_device *net = to_net_dev(dev);
124 if (dev_isalive(net))
125 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
129 static int change_carrier(struct net_device *net, unsigned long new_carrier)
131 if (!netif_running(net))
133 return dev_change_carrier(net, (bool) new_carrier);
136 static ssize_t store_carrier(struct device *dev, struct device_attribute *attr,
137 const char *buf, size_t len)
139 return netdev_store(dev, attr, buf, len, change_carrier);
142 static ssize_t show_carrier(struct device *dev,
143 struct device_attribute *attr, char *buf)
145 struct net_device *netdev = to_net_dev(dev);
146 if (netif_running(netdev)) {
147 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
152 static ssize_t show_speed(struct device *dev,
153 struct device_attribute *attr, char *buf)
155 struct net_device *netdev = to_net_dev(dev);
159 return restart_syscall();
161 if (netif_running(netdev)) {
162 struct ethtool_cmd cmd;
163 if (!__ethtool_get_settings(netdev, &cmd))
164 ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
170 static ssize_t show_duplex(struct device *dev,
171 struct device_attribute *attr, char *buf)
173 struct net_device *netdev = to_net_dev(dev);
177 return restart_syscall();
179 if (netif_running(netdev)) {
180 struct ethtool_cmd cmd;
181 if (!__ethtool_get_settings(netdev, &cmd)) {
183 switch (cmd.duplex) {
194 ret = sprintf(buf, "%s\n", duplex);
201 static ssize_t show_dormant(struct device *dev,
202 struct device_attribute *attr, char *buf)
204 struct net_device *netdev = to_net_dev(dev);
206 if (netif_running(netdev))
207 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
212 static const char *const operstates[] = {
214 "notpresent", /* currently unused */
217 "testing", /* currently unused */
222 static ssize_t show_operstate(struct device *dev,
223 struct device_attribute *attr, char *buf)
225 const struct net_device *netdev = to_net_dev(dev);
226 unsigned char operstate;
228 read_lock(&dev_base_lock);
229 operstate = netdev->operstate;
230 if (!netif_running(netdev))
231 operstate = IF_OPER_DOWN;
232 read_unlock(&dev_base_lock);
234 if (operstate >= ARRAY_SIZE(operstates))
235 return -EINVAL; /* should not happen */
237 return sprintf(buf, "%s\n", operstates[operstate]);
240 /* read-write attributes */
241 NETDEVICE_SHOW(mtu, fmt_dec);
243 static int change_mtu(struct net_device *net, unsigned long new_mtu)
245 return dev_set_mtu(net, (int) new_mtu);
248 static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
249 const char *buf, size_t len)
251 return netdev_store(dev, attr, buf, len, change_mtu);
254 NETDEVICE_SHOW(flags, fmt_hex);
256 static int change_flags(struct net_device *net, unsigned long new_flags)
258 return dev_change_flags(net, (unsigned int) new_flags);
261 static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
262 const char *buf, size_t len)
264 return netdev_store(dev, attr, buf, len, change_flags);
267 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
269 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
271 net->tx_queue_len = new_len;
275 static ssize_t store_tx_queue_len(struct device *dev,
276 struct device_attribute *attr,
277 const char *buf, size_t len)
279 if (!capable(CAP_NET_ADMIN))
282 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
285 static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
286 const char *buf, size_t len)
288 struct net_device *netdev = to_net_dev(dev);
289 struct net *net = dev_net(netdev);
293 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
296 /* ignore trailing newline */
297 if (len > 0 && buf[len - 1] == '\n')
301 return restart_syscall();
302 ret = dev_set_alias(netdev, buf, count);
305 return ret < 0 ? ret : len;
308 static ssize_t show_ifalias(struct device *dev,
309 struct device_attribute *attr, char *buf)
311 const struct net_device *netdev = to_net_dev(dev);
315 return restart_syscall();
317 ret = sprintf(buf, "%s\n", netdev->ifalias);
322 NETDEVICE_SHOW(group, fmt_dec);
324 static int change_group(struct net_device *net, unsigned long new_group)
326 dev_set_group(net, (int) new_group);
330 static ssize_t store_group(struct device *dev, struct device_attribute *attr,
331 const char *buf, size_t len)
333 return netdev_store(dev, attr, buf, len, change_group);
336 static struct device_attribute net_class_attributes[] = {
337 __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
338 __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
339 __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
340 __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
341 __ATTR(iflink, S_IRUGO, show_iflink, NULL),
342 __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
343 __ATTR(type, S_IRUGO, show_type, NULL),
344 __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
345 __ATTR(address, S_IRUGO, show_address, NULL),
346 __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
347 __ATTR(carrier, S_IRUGO | S_IWUSR, show_carrier, store_carrier),
348 __ATTR(speed, S_IRUGO, show_speed, NULL),
349 __ATTR(duplex, S_IRUGO, show_duplex, NULL),
350 __ATTR(dormant, S_IRUGO, show_dormant, NULL),
351 __ATTR(operstate, S_IRUGO, show_operstate, NULL),
352 __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
353 __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
354 __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
356 __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
360 /* Show a given an attribute in the statistics group */
361 static ssize_t netstat_show(const struct device *d,
362 struct device_attribute *attr, char *buf,
363 unsigned long offset)
365 struct net_device *dev = to_net_dev(d);
366 ssize_t ret = -EINVAL;
368 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
369 offset % sizeof(u64) != 0);
371 read_lock(&dev_base_lock);
372 if (dev_isalive(dev)) {
373 struct rtnl_link_stats64 temp;
374 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
376 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
378 read_unlock(&dev_base_lock);
382 /* generate a read-only statistics attribute */
383 #define NETSTAT_ENTRY(name) \
384 static ssize_t show_##name(struct device *d, \
385 struct device_attribute *attr, char *buf) \
387 return netstat_show(d, attr, buf, \
388 offsetof(struct rtnl_link_stats64, name)); \
390 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
392 NETSTAT_ENTRY(rx_packets);
393 NETSTAT_ENTRY(tx_packets);
394 NETSTAT_ENTRY(rx_bytes);
395 NETSTAT_ENTRY(tx_bytes);
396 NETSTAT_ENTRY(rx_errors);
397 NETSTAT_ENTRY(tx_errors);
398 NETSTAT_ENTRY(rx_dropped);
399 NETSTAT_ENTRY(tx_dropped);
400 NETSTAT_ENTRY(multicast);
401 NETSTAT_ENTRY(collisions);
402 NETSTAT_ENTRY(rx_length_errors);
403 NETSTAT_ENTRY(rx_over_errors);
404 NETSTAT_ENTRY(rx_crc_errors);
405 NETSTAT_ENTRY(rx_frame_errors);
406 NETSTAT_ENTRY(rx_fifo_errors);
407 NETSTAT_ENTRY(rx_missed_errors);
408 NETSTAT_ENTRY(tx_aborted_errors);
409 NETSTAT_ENTRY(tx_carrier_errors);
410 NETSTAT_ENTRY(tx_fifo_errors);
411 NETSTAT_ENTRY(tx_heartbeat_errors);
412 NETSTAT_ENTRY(tx_window_errors);
413 NETSTAT_ENTRY(rx_compressed);
414 NETSTAT_ENTRY(tx_compressed);
416 static struct attribute *netstat_attrs[] = {
417 &dev_attr_rx_packets.attr,
418 &dev_attr_tx_packets.attr,
419 &dev_attr_rx_bytes.attr,
420 &dev_attr_tx_bytes.attr,
421 &dev_attr_rx_errors.attr,
422 &dev_attr_tx_errors.attr,
423 &dev_attr_rx_dropped.attr,
424 &dev_attr_tx_dropped.attr,
425 &dev_attr_multicast.attr,
426 &dev_attr_collisions.attr,
427 &dev_attr_rx_length_errors.attr,
428 &dev_attr_rx_over_errors.attr,
429 &dev_attr_rx_crc_errors.attr,
430 &dev_attr_rx_frame_errors.attr,
431 &dev_attr_rx_fifo_errors.attr,
432 &dev_attr_rx_missed_errors.attr,
433 &dev_attr_tx_aborted_errors.attr,
434 &dev_attr_tx_carrier_errors.attr,
435 &dev_attr_tx_fifo_errors.attr,
436 &dev_attr_tx_heartbeat_errors.attr,
437 &dev_attr_tx_window_errors.attr,
438 &dev_attr_rx_compressed.attr,
439 &dev_attr_tx_compressed.attr,
444 static struct attribute_group netstat_group = {
445 .name = "statistics",
446 .attrs = netstat_attrs,
449 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
450 static struct attribute *wireless_attrs[] = {
454 static struct attribute_group wireless_group = {
456 .attrs = wireless_attrs,
459 #endif /* CONFIG_SYSFS */
463 * RX queue sysfs structures and functions.
465 struct rx_queue_attribute {
466 struct attribute attr;
467 ssize_t (*show)(struct netdev_rx_queue *queue,
468 struct rx_queue_attribute *attr, char *buf);
469 ssize_t (*store)(struct netdev_rx_queue *queue,
470 struct rx_queue_attribute *attr, const char *buf, size_t len);
472 #define to_rx_queue_attr(_attr) container_of(_attr, \
473 struct rx_queue_attribute, attr)
475 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
477 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
480 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
481 struct netdev_rx_queue *queue = to_rx_queue(kobj);
483 if (!attribute->show)
486 return attribute->show(queue, attribute, buf);
489 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
490 const char *buf, size_t count)
492 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
493 struct netdev_rx_queue *queue = to_rx_queue(kobj);
495 if (!attribute->store)
498 return attribute->store(queue, attribute, buf, count);
501 static const struct sysfs_ops rx_queue_sysfs_ops = {
502 .show = rx_queue_attr_show,
503 .store = rx_queue_attr_store,
506 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
507 struct rx_queue_attribute *attribute, char *buf)
514 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
518 map = rcu_dereference(queue->rps_map);
520 for (i = 0; i < map->len; i++)
521 cpumask_set_cpu(map->cpus[i], mask);
523 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
524 if (PAGE_SIZE - len < 3) {
526 free_cpumask_var(mask);
531 free_cpumask_var(mask);
532 len += sprintf(buf + len, "\n");
536 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
537 struct rx_queue_attribute *attribute,
538 const char *buf, size_t len)
540 struct rps_map *old_map, *map;
543 static DEFINE_SPINLOCK(rps_map_lock);
545 if (!capable(CAP_NET_ADMIN))
548 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
551 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
553 free_cpumask_var(mask);
557 map = kzalloc(max_t(unsigned int,
558 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
561 free_cpumask_var(mask);
566 for_each_cpu_and(cpu, mask, cpu_online_mask)
567 map->cpus[i++] = cpu;
576 spin_lock(&rps_map_lock);
577 old_map = rcu_dereference_protected(queue->rps_map,
578 lockdep_is_held(&rps_map_lock));
579 rcu_assign_pointer(queue->rps_map, map);
580 spin_unlock(&rps_map_lock);
583 static_key_slow_inc(&rps_needed);
585 kfree_rcu(old_map, rcu);
586 static_key_slow_dec(&rps_needed);
588 free_cpumask_var(mask);
592 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
593 struct rx_queue_attribute *attr,
596 struct rps_dev_flow_table *flow_table;
597 unsigned long val = 0;
600 flow_table = rcu_dereference(queue->rps_flow_table);
602 val = (unsigned long)flow_table->mask + 1;
605 return sprintf(buf, "%lu\n", val);
608 static void rps_dev_flow_table_release_work(struct work_struct *work)
610 struct rps_dev_flow_table *table = container_of(work,
611 struct rps_dev_flow_table, free_work);
616 static void rps_dev_flow_table_release(struct rcu_head *rcu)
618 struct rps_dev_flow_table *table = container_of(rcu,
619 struct rps_dev_flow_table, rcu);
621 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
622 schedule_work(&table->free_work);
625 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
626 struct rx_queue_attribute *attr,
627 const char *buf, size_t len)
629 unsigned long mask, count;
630 struct rps_dev_flow_table *table, *old_table;
631 static DEFINE_SPINLOCK(rps_dev_flow_lock);
634 if (!capable(CAP_NET_ADMIN))
637 rc = kstrtoul(buf, 0, &count);
643 /* mask = roundup_pow_of_two(count) - 1;
644 * without overflows...
646 while ((mask | (mask >> 1)) != mask)
648 /* On 64 bit arches, must check mask fits in table->mask (u32),
649 * and on 32bit arches, must check RPS_DEV_FLOW_TABLE_SIZE(mask + 1)
652 #if BITS_PER_LONG > 32
653 if (mask > (unsigned long)(u32)mask)
656 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
657 / sizeof(struct rps_dev_flow)) {
658 /* Enforce a limit to prevent overflow */
662 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
667 for (count = 0; count <= mask; count++)
668 table->flows[count].cpu = RPS_NO_CPU;
672 spin_lock(&rps_dev_flow_lock);
673 old_table = rcu_dereference_protected(queue->rps_flow_table,
674 lockdep_is_held(&rps_dev_flow_lock));
675 rcu_assign_pointer(queue->rps_flow_table, table);
676 spin_unlock(&rps_dev_flow_lock);
679 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
684 static struct rx_queue_attribute rps_cpus_attribute =
685 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
688 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
689 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
690 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
692 static struct attribute *rx_queue_default_attrs[] = {
693 &rps_cpus_attribute.attr,
694 &rps_dev_flow_table_cnt_attribute.attr,
698 static void rx_queue_release(struct kobject *kobj)
700 struct netdev_rx_queue *queue = to_rx_queue(kobj);
702 struct rps_dev_flow_table *flow_table;
705 map = rcu_dereference_protected(queue->rps_map, 1);
707 RCU_INIT_POINTER(queue->rps_map, NULL);
711 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
713 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
714 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
717 memset(kobj, 0, sizeof(*kobj));
721 static struct kobj_type rx_queue_ktype = {
722 .sysfs_ops = &rx_queue_sysfs_ops,
723 .release = rx_queue_release,
724 .default_attrs = rx_queue_default_attrs,
727 static int rx_queue_add_kobject(struct net_device *net, int index)
729 struct netdev_rx_queue *queue = net->_rx + index;
730 struct kobject *kobj = &queue->kobj;
733 kobj->kset = net->queues_kset;
734 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
741 kobject_uevent(kobj, KOBJ_ADD);
742 dev_hold(queue->dev);
746 #endif /* CONFIG_RPS */
749 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
755 for (i = old_num; i < new_num; i++) {
756 error = rx_queue_add_kobject(net, i);
763 while (--i >= new_num)
764 kobject_put(&net->_rx[i].kobj);
774 * netdev_queue sysfs structures and functions.
776 struct netdev_queue_attribute {
777 struct attribute attr;
778 ssize_t (*show)(struct netdev_queue *queue,
779 struct netdev_queue_attribute *attr, char *buf);
780 ssize_t (*store)(struct netdev_queue *queue,
781 struct netdev_queue_attribute *attr, const char *buf, size_t len);
783 #define to_netdev_queue_attr(_attr) container_of(_attr, \
784 struct netdev_queue_attribute, attr)
786 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
788 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
789 struct attribute *attr, char *buf)
791 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
792 struct netdev_queue *queue = to_netdev_queue(kobj);
794 if (!attribute->show)
797 return attribute->show(queue, attribute, buf);
800 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
801 struct attribute *attr,
802 const char *buf, size_t count)
804 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
805 struct netdev_queue *queue = to_netdev_queue(kobj);
807 if (!attribute->store)
810 return attribute->store(queue, attribute, buf, count);
813 static const struct sysfs_ops netdev_queue_sysfs_ops = {
814 .show = netdev_queue_attr_show,
815 .store = netdev_queue_attr_store,
818 static ssize_t show_trans_timeout(struct netdev_queue *queue,
819 struct netdev_queue_attribute *attribute,
822 unsigned long trans_timeout;
824 spin_lock_irq(&queue->_xmit_lock);
825 trans_timeout = queue->trans_timeout;
826 spin_unlock_irq(&queue->_xmit_lock);
828 return sprintf(buf, "%lu", trans_timeout);
831 static struct netdev_queue_attribute queue_trans_timeout =
832 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
836 * Byte queue limits sysfs structures and functions.
838 static ssize_t bql_show(char *buf, unsigned int value)
840 return sprintf(buf, "%u\n", value);
843 static ssize_t bql_set(const char *buf, const size_t count,
844 unsigned int *pvalue)
849 if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
850 value = DQL_MAX_LIMIT;
852 err = kstrtouint(buf, 10, &value);
855 if (value > DQL_MAX_LIMIT)
864 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
865 struct netdev_queue_attribute *attr,
868 struct dql *dql = &queue->dql;
870 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
873 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
874 struct netdev_queue_attribute *attribute,
875 const char *buf, size_t len)
877 struct dql *dql = &queue->dql;
881 err = kstrtouint(buf, 10, &value);
885 dql->slack_hold_time = msecs_to_jiffies(value);
890 static struct netdev_queue_attribute bql_hold_time_attribute =
891 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
894 static ssize_t bql_show_inflight(struct netdev_queue *queue,
895 struct netdev_queue_attribute *attr,
898 struct dql *dql = &queue->dql;
900 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
903 static struct netdev_queue_attribute bql_inflight_attribute =
904 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
906 #define BQL_ATTR(NAME, FIELD) \
907 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
908 struct netdev_queue_attribute *attr, \
911 return bql_show(buf, queue->dql.FIELD); \
914 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
915 struct netdev_queue_attribute *attr, \
916 const char *buf, size_t len) \
918 return bql_set(buf, len, &queue->dql.FIELD); \
921 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \
922 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \
925 BQL_ATTR(limit, limit)
926 BQL_ATTR(limit_max, max_limit)
927 BQL_ATTR(limit_min, min_limit)
929 static struct attribute *dql_attrs[] = {
930 &bql_limit_attribute.attr,
931 &bql_limit_max_attribute.attr,
932 &bql_limit_min_attribute.attr,
933 &bql_hold_time_attribute.attr,
934 &bql_inflight_attribute.attr,
938 static struct attribute_group dql_group = {
939 .name = "byte_queue_limits",
942 #endif /* CONFIG_BQL */
945 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
947 struct net_device *dev = queue->dev;
950 for (i = 0; i < dev->num_tx_queues; i++)
951 if (queue == &dev->_tx[i])
954 BUG_ON(i >= dev->num_tx_queues);
960 static ssize_t show_xps_map(struct netdev_queue *queue,
961 struct netdev_queue_attribute *attribute, char *buf)
963 struct net_device *dev = queue->dev;
964 struct xps_dev_maps *dev_maps;
970 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
973 index = get_netdev_queue_index(queue);
976 dev_maps = rcu_dereference(dev->xps_maps);
978 for_each_possible_cpu(i) {
979 struct xps_map *map =
980 rcu_dereference(dev_maps->cpu_map[i]);
983 for (j = 0; j < map->len; j++) {
984 if (map->queues[j] == index) {
985 cpumask_set_cpu(i, mask);
994 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
995 if (PAGE_SIZE - len < 3) {
996 free_cpumask_var(mask);
1000 free_cpumask_var(mask);
1001 len += sprintf(buf + len, "\n");
1005 static ssize_t store_xps_map(struct netdev_queue *queue,
1006 struct netdev_queue_attribute *attribute,
1007 const char *buf, size_t len)
1009 struct net_device *dev = queue->dev;
1010 unsigned long index;
1014 if (!capable(CAP_NET_ADMIN))
1017 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1020 index = get_netdev_queue_index(queue);
1022 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1024 free_cpumask_var(mask);
1028 err = netif_set_xps_queue(dev, mask, index);
1030 free_cpumask_var(mask);
1035 static struct netdev_queue_attribute xps_cpus_attribute =
1036 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1037 #endif /* CONFIG_XPS */
1039 static struct attribute *netdev_queue_default_attrs[] = {
1040 &queue_trans_timeout.attr,
1042 &xps_cpus_attribute.attr,
1047 static void netdev_queue_release(struct kobject *kobj)
1049 struct netdev_queue *queue = to_netdev_queue(kobj);
1051 memset(kobj, 0, sizeof(*kobj));
1052 dev_put(queue->dev);
1055 static struct kobj_type netdev_queue_ktype = {
1056 .sysfs_ops = &netdev_queue_sysfs_ops,
1057 .release = netdev_queue_release,
1058 .default_attrs = netdev_queue_default_attrs,
1061 static int netdev_queue_add_kobject(struct net_device *net, int index)
1063 struct netdev_queue *queue = net->_tx + index;
1064 struct kobject *kobj = &queue->kobj;
1067 kobj->kset = net->queues_kset;
1068 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1074 error = sysfs_create_group(kobj, &dql_group);
1079 kobject_uevent(kobj, KOBJ_ADD);
1080 dev_hold(queue->dev);
1087 #endif /* CONFIG_SYSFS */
1090 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1096 for (i = old_num; i < new_num; i++) {
1097 error = netdev_queue_add_kobject(net, i);
1104 while (--i >= new_num) {
1105 struct netdev_queue *queue = net->_tx + i;
1108 sysfs_remove_group(&queue->kobj, &dql_group);
1110 kobject_put(&queue->kobj);
1116 #endif /* CONFIG_SYSFS */
1119 static int register_queue_kobjects(struct net_device *net)
1121 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1124 net->queues_kset = kset_create_and_add("queues",
1125 NULL, &net->dev.kobj);
1126 if (!net->queues_kset)
1131 real_rx = net->real_num_rx_queues;
1133 real_tx = net->real_num_tx_queues;
1135 error = net_rx_queue_update_kobjects(net, 0, real_rx);
1140 error = netdev_queue_update_kobjects(net, 0, real_tx);
1148 netdev_queue_update_kobjects(net, txq, 0);
1149 net_rx_queue_update_kobjects(net, rxq, 0);
1153 static void remove_queue_kobjects(struct net_device *net)
1155 int real_rx = 0, real_tx = 0;
1158 real_rx = net->real_num_rx_queues;
1160 real_tx = net->real_num_tx_queues;
1162 net_rx_queue_update_kobjects(net, real_rx, 0);
1163 netdev_queue_update_kobjects(net, real_tx, 0);
1165 kset_unregister(net->queues_kset);
1169 static void *net_grab_current_ns(void)
1171 struct net *ns = current->nsproxy->net_ns;
1172 #ifdef CONFIG_NET_NS
1174 atomic_inc(&ns->passive);
1179 static const void *net_initial_ns(void)
1184 static const void *net_netlink_ns(struct sock *sk)
1186 return sock_net(sk);
1189 struct kobj_ns_type_operations net_ns_type_operations = {
1190 .type = KOBJ_NS_TYPE_NET,
1191 .grab_current_ns = net_grab_current_ns,
1192 .netlink_ns = net_netlink_ns,
1193 .initial_ns = net_initial_ns,
1194 .drop_ns = net_drop_ns,
1196 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1198 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1200 struct net_device *dev = to_net_dev(d);
1203 /* pass interface to uevent. */
1204 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1208 /* pass ifindex to uevent.
1209 * ifindex is useful as it won't change (interface name may change)
1210 * and is what RtNetlink uses natively. */
1211 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1218 * netdev_release -- destroy and free a dead device.
1219 * Called when last reference to device kobject is gone.
1221 static void netdev_release(struct device *d)
1223 struct net_device *dev = to_net_dev(d);
1225 BUG_ON(dev->reg_state != NETREG_RELEASED);
1227 kfree(dev->ifalias);
1228 kfree((char *)dev - dev->padded);
1231 static const void *net_namespace(struct device *d)
1233 struct net_device *dev;
1234 dev = container_of(d, struct net_device, dev);
1235 return dev_net(dev);
1238 static struct class net_class = {
1240 .dev_release = netdev_release,
1242 .dev_attrs = net_class_attributes,
1243 #endif /* CONFIG_SYSFS */
1244 .dev_uevent = netdev_uevent,
1245 .ns_type = &net_ns_type_operations,
1246 .namespace = net_namespace,
1249 /* Delete sysfs entries but hold kobject reference until after all
1250 * netdev references are gone.
1252 void netdev_unregister_kobject(struct net_device * net)
1254 struct device *dev = &(net->dev);
1256 kobject_get(&dev->kobj);
1258 remove_queue_kobjects(net);
1263 /* Create sysfs entries for network device. */
1264 int netdev_register_kobject(struct net_device *net)
1266 struct device *dev = &(net->dev);
1267 const struct attribute_group **groups = net->sysfs_groups;
1270 device_initialize(dev);
1271 dev->class = &net_class;
1272 dev->platform_data = net;
1273 dev->groups = groups;
1275 dev_set_name(dev, "%s", net->name);
1278 /* Allow for a device specific group */
1282 *groups++ = &netstat_group;
1284 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1285 if (net->ieee80211_ptr)
1286 *groups++ = &wireless_group;
1287 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1288 else if (net->wireless_handlers)
1289 *groups++ = &wireless_group;
1292 #endif /* CONFIG_SYSFS */
1294 error = device_add(dev);
1298 error = register_queue_kobjects(net);
1307 int netdev_class_create_file(struct class_attribute *class_attr)
1309 return class_create_file(&net_class, class_attr);
1311 EXPORT_SYMBOL(netdev_class_create_file);
1313 void netdev_class_remove_file(struct class_attribute *class_attr)
1315 class_remove_file(&net_class, class_attr);
1317 EXPORT_SYMBOL(netdev_class_remove_file);
1319 int netdev_kobject_init(void)
1321 kobj_ns_type_register(&net_ns_type_operations);
1322 return class_register(&net_class);