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/wireless.h>
22 #include <linux/vmalloc.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_ulong[] = "%lu\n";
32 static const char fmt_u64[] = "%llu\n";
34 static inline int dev_isalive(const struct net_device *dev)
36 return dev->reg_state <= NETREG_REGISTERED;
39 /* use same locking rules as GIF* ioctl's */
40 static ssize_t netdev_show(const struct device *dev,
41 struct device_attribute *attr, char *buf,
42 ssize_t (*format)(const struct net_device *, char *))
44 struct net_device *net = to_net_dev(dev);
45 ssize_t ret = -EINVAL;
47 read_lock(&dev_base_lock);
49 ret = (*format)(net, buf);
50 read_unlock(&dev_base_lock);
55 /* generate a show function for simple field */
56 #define NETDEVICE_SHOW(field, format_string) \
57 static ssize_t format_##field(const struct net_device *net, char *buf) \
59 return sprintf(buf, format_string, net->field); \
61 static ssize_t show_##field(struct device *dev, \
62 struct device_attribute *attr, char *buf) \
64 return netdev_show(dev, attr, buf, format_##field); \
68 /* use same locking and permission rules as SIF* ioctl's */
69 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
70 const char *buf, size_t len,
71 int (*set)(struct net_device *, unsigned long))
73 struct net_device *net = to_net_dev(dev);
78 if (!capable(CAP_NET_ADMIN))
81 new = simple_strtoul(buf, &endp, 0);
86 return restart_syscall();
88 if (dev_isalive(net)) {
89 if ((ret = (*set)(net, new)) == 0)
97 NETDEVICE_SHOW(dev_id, fmt_hex);
98 NETDEVICE_SHOW(addr_assign_type, fmt_dec);
99 NETDEVICE_SHOW(addr_len, fmt_dec);
100 NETDEVICE_SHOW(iflink, fmt_dec);
101 NETDEVICE_SHOW(ifindex, fmt_dec);
102 NETDEVICE_SHOW(features, fmt_hex);
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 ssize_t show_carrier(struct device *dev,
130 struct device_attribute *attr, char *buf)
132 struct net_device *netdev = to_net_dev(dev);
133 if (netif_running(netdev)) {
134 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
139 static ssize_t show_speed(struct device *dev,
140 struct device_attribute *attr, char *buf)
142 struct net_device *netdev = to_net_dev(dev);
146 return restart_syscall();
148 if (netif_running(netdev) &&
149 netdev->ethtool_ops &&
150 netdev->ethtool_ops->get_settings) {
151 struct ethtool_cmd cmd = { ETHTOOL_GSET };
153 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
154 ret = sprintf(buf, fmt_dec, ethtool_cmd_speed(&cmd));
160 static ssize_t show_duplex(struct device *dev,
161 struct device_attribute *attr, char *buf)
163 struct net_device *netdev = to_net_dev(dev);
167 return restart_syscall();
169 if (netif_running(netdev) &&
170 netdev->ethtool_ops &&
171 netdev->ethtool_ops->get_settings) {
172 struct ethtool_cmd cmd = { ETHTOOL_GSET };
174 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
175 ret = sprintf(buf, "%s\n", cmd.duplex ? "full" : "half");
181 static ssize_t show_dormant(struct device *dev,
182 struct device_attribute *attr, char *buf)
184 struct net_device *netdev = to_net_dev(dev);
186 if (netif_running(netdev))
187 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
192 static const char *const operstates[] = {
194 "notpresent", /* currently unused */
197 "testing", /* currently unused */
202 static ssize_t show_operstate(struct device *dev,
203 struct device_attribute *attr, char *buf)
205 const struct net_device *netdev = to_net_dev(dev);
206 unsigned char operstate;
208 read_lock(&dev_base_lock);
209 operstate = netdev->operstate;
210 if (!netif_running(netdev))
211 operstate = IF_OPER_DOWN;
212 read_unlock(&dev_base_lock);
214 if (operstate >= ARRAY_SIZE(operstates))
215 return -EINVAL; /* should not happen */
217 return sprintf(buf, "%s\n", operstates[operstate]);
220 /* read-write attributes */
221 NETDEVICE_SHOW(mtu, fmt_dec);
223 static int change_mtu(struct net_device *net, unsigned long new_mtu)
225 return dev_set_mtu(net, (int) new_mtu);
228 static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
229 const char *buf, size_t len)
231 return netdev_store(dev, attr, buf, len, change_mtu);
234 NETDEVICE_SHOW(flags, fmt_hex);
236 static int change_flags(struct net_device *net, unsigned long new_flags)
238 return dev_change_flags(net, (unsigned) new_flags);
241 static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
242 const char *buf, size_t len)
244 return netdev_store(dev, attr, buf, len, change_flags);
247 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
249 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
251 net->tx_queue_len = new_len;
255 static ssize_t store_tx_queue_len(struct device *dev,
256 struct device_attribute *attr,
257 const char *buf, size_t len)
259 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
262 static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
263 const char *buf, size_t len)
265 struct net_device *netdev = to_net_dev(dev);
269 if (!capable(CAP_NET_ADMIN))
272 /* ignore trailing newline */
273 if (len > 0 && buf[len - 1] == '\n')
277 return restart_syscall();
278 ret = dev_set_alias(netdev, buf, count);
281 return ret < 0 ? ret : len;
284 static ssize_t show_ifalias(struct device *dev,
285 struct device_attribute *attr, char *buf)
287 const struct net_device *netdev = to_net_dev(dev);
291 return restart_syscall();
293 ret = sprintf(buf, "%s\n", netdev->ifalias);
298 NETDEVICE_SHOW(group, fmt_dec);
300 static int change_group(struct net_device *net, unsigned long new_group)
302 dev_set_group(net, (int) new_group);
306 static ssize_t store_group(struct device *dev, struct device_attribute *attr,
307 const char *buf, size_t len)
309 return netdev_store(dev, attr, buf, len, change_group);
312 static struct device_attribute net_class_attributes[] = {
313 __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
314 __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
315 __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
316 __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
317 __ATTR(iflink, S_IRUGO, show_iflink, NULL),
318 __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
319 __ATTR(features, S_IRUGO, show_features, NULL),
320 __ATTR(type, S_IRUGO, show_type, NULL),
321 __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
322 __ATTR(address, S_IRUGO, show_address, NULL),
323 __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
324 __ATTR(carrier, S_IRUGO, show_carrier, NULL),
325 __ATTR(speed, S_IRUGO, show_speed, NULL),
326 __ATTR(duplex, S_IRUGO, show_duplex, NULL),
327 __ATTR(dormant, S_IRUGO, show_dormant, NULL),
328 __ATTR(operstate, S_IRUGO, show_operstate, NULL),
329 __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
330 __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
331 __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
333 __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
337 /* Show a given an attribute in the statistics group */
338 static ssize_t netstat_show(const struct device *d,
339 struct device_attribute *attr, char *buf,
340 unsigned long offset)
342 struct net_device *dev = to_net_dev(d);
343 ssize_t ret = -EINVAL;
345 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
346 offset % sizeof(u64) != 0);
348 read_lock(&dev_base_lock);
349 if (dev_isalive(dev)) {
350 struct rtnl_link_stats64 temp;
351 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
353 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
355 read_unlock(&dev_base_lock);
359 /* generate a read-only statistics attribute */
360 #define NETSTAT_ENTRY(name) \
361 static ssize_t show_##name(struct device *d, \
362 struct device_attribute *attr, char *buf) \
364 return netstat_show(d, attr, buf, \
365 offsetof(struct rtnl_link_stats64, name)); \
367 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
369 NETSTAT_ENTRY(rx_packets);
370 NETSTAT_ENTRY(tx_packets);
371 NETSTAT_ENTRY(rx_bytes);
372 NETSTAT_ENTRY(tx_bytes);
373 NETSTAT_ENTRY(rx_errors);
374 NETSTAT_ENTRY(tx_errors);
375 NETSTAT_ENTRY(rx_dropped);
376 NETSTAT_ENTRY(tx_dropped);
377 NETSTAT_ENTRY(multicast);
378 NETSTAT_ENTRY(collisions);
379 NETSTAT_ENTRY(rx_length_errors);
380 NETSTAT_ENTRY(rx_over_errors);
381 NETSTAT_ENTRY(rx_crc_errors);
382 NETSTAT_ENTRY(rx_frame_errors);
383 NETSTAT_ENTRY(rx_fifo_errors);
384 NETSTAT_ENTRY(rx_missed_errors);
385 NETSTAT_ENTRY(tx_aborted_errors);
386 NETSTAT_ENTRY(tx_carrier_errors);
387 NETSTAT_ENTRY(tx_fifo_errors);
388 NETSTAT_ENTRY(tx_heartbeat_errors);
389 NETSTAT_ENTRY(tx_window_errors);
390 NETSTAT_ENTRY(rx_compressed);
391 NETSTAT_ENTRY(tx_compressed);
393 static struct attribute *netstat_attrs[] = {
394 &dev_attr_rx_packets.attr,
395 &dev_attr_tx_packets.attr,
396 &dev_attr_rx_bytes.attr,
397 &dev_attr_tx_bytes.attr,
398 &dev_attr_rx_errors.attr,
399 &dev_attr_tx_errors.attr,
400 &dev_attr_rx_dropped.attr,
401 &dev_attr_tx_dropped.attr,
402 &dev_attr_multicast.attr,
403 &dev_attr_collisions.attr,
404 &dev_attr_rx_length_errors.attr,
405 &dev_attr_rx_over_errors.attr,
406 &dev_attr_rx_crc_errors.attr,
407 &dev_attr_rx_frame_errors.attr,
408 &dev_attr_rx_fifo_errors.attr,
409 &dev_attr_rx_missed_errors.attr,
410 &dev_attr_tx_aborted_errors.attr,
411 &dev_attr_tx_carrier_errors.attr,
412 &dev_attr_tx_fifo_errors.attr,
413 &dev_attr_tx_heartbeat_errors.attr,
414 &dev_attr_tx_window_errors.attr,
415 &dev_attr_rx_compressed.attr,
416 &dev_attr_tx_compressed.attr,
421 static struct attribute_group netstat_group = {
422 .name = "statistics",
423 .attrs = netstat_attrs,
426 #ifdef CONFIG_WIRELESS_EXT_SYSFS
427 /* helper function that does all the locking etc for wireless stats */
428 static ssize_t wireless_show(struct device *d, char *buf,
429 ssize_t (*format)(const struct iw_statistics *,
432 struct net_device *dev = to_net_dev(d);
433 const struct iw_statistics *iw;
434 ssize_t ret = -EINVAL;
437 return restart_syscall();
438 if (dev_isalive(dev)) {
439 iw = get_wireless_stats(dev);
441 ret = (*format)(iw, buf);
448 /* show function template for wireless fields */
449 #define WIRELESS_SHOW(name, field, format_string) \
450 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
452 return sprintf(buf, format_string, iw->field); \
454 static ssize_t show_iw_##name(struct device *d, \
455 struct device_attribute *attr, char *buf) \
457 return wireless_show(d, buf, format_iw_##name); \
459 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
461 WIRELESS_SHOW(status, status, fmt_hex);
462 WIRELESS_SHOW(link, qual.qual, fmt_dec);
463 WIRELESS_SHOW(level, qual.level, fmt_dec);
464 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
465 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
466 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
467 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
468 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
469 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
470 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
472 static struct attribute *wireless_attrs[] = {
473 &dev_attr_status.attr,
475 &dev_attr_level.attr,
476 &dev_attr_noise.attr,
478 &dev_attr_crypt.attr,
479 &dev_attr_fragment.attr,
480 &dev_attr_retries.attr,
482 &dev_attr_beacon.attr,
486 static struct attribute_group wireless_group = {
488 .attrs = wireless_attrs,
491 #endif /* CONFIG_SYSFS */
495 * RX queue sysfs structures and functions.
497 struct rx_queue_attribute {
498 struct attribute attr;
499 ssize_t (*show)(struct netdev_rx_queue *queue,
500 struct rx_queue_attribute *attr, char *buf);
501 ssize_t (*store)(struct netdev_rx_queue *queue,
502 struct rx_queue_attribute *attr, const char *buf, size_t len);
504 #define to_rx_queue_attr(_attr) container_of(_attr, \
505 struct rx_queue_attribute, attr)
507 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
509 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
512 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
513 struct netdev_rx_queue *queue = to_rx_queue(kobj);
515 if (!attribute->show)
518 return attribute->show(queue, attribute, buf);
521 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
522 const char *buf, size_t count)
524 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
525 struct netdev_rx_queue *queue = to_rx_queue(kobj);
527 if (!attribute->store)
530 return attribute->store(queue, attribute, buf, count);
533 static const struct sysfs_ops rx_queue_sysfs_ops = {
534 .show = rx_queue_attr_show,
535 .store = rx_queue_attr_store,
538 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
539 struct rx_queue_attribute *attribute, char *buf)
546 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
550 map = rcu_dereference(queue->rps_map);
552 for (i = 0; i < map->len; i++)
553 cpumask_set_cpu(map->cpus[i], mask);
555 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
556 if (PAGE_SIZE - len < 3) {
558 free_cpumask_var(mask);
563 free_cpumask_var(mask);
564 len += sprintf(buf + len, "\n");
568 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
569 struct rx_queue_attribute *attribute,
570 const char *buf, size_t len)
572 struct rps_map *old_map, *map;
575 static DEFINE_SPINLOCK(rps_map_lock);
577 if (!capable(CAP_NET_ADMIN))
580 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
583 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
585 free_cpumask_var(mask);
589 map = kzalloc(max_t(unsigned,
590 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
593 free_cpumask_var(mask);
598 for_each_cpu_and(cpu, mask, cpu_online_mask)
599 map->cpus[i++] = cpu;
608 spin_lock(&rps_map_lock);
609 old_map = rcu_dereference_protected(queue->rps_map,
610 lockdep_is_held(&rps_map_lock));
611 rcu_assign_pointer(queue->rps_map, map);
612 spin_unlock(&rps_map_lock);
615 kfree_rcu(old_map, rcu);
617 free_cpumask_var(mask);
621 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
622 struct rx_queue_attribute *attr,
625 struct rps_dev_flow_table *flow_table;
626 unsigned int val = 0;
629 flow_table = rcu_dereference(queue->rps_flow_table);
631 val = flow_table->mask + 1;
634 return sprintf(buf, "%u\n", val);
637 static void rps_dev_flow_table_release_work(struct work_struct *work)
639 struct rps_dev_flow_table *table = container_of(work,
640 struct rps_dev_flow_table, free_work);
645 static void rps_dev_flow_table_release(struct rcu_head *rcu)
647 struct rps_dev_flow_table *table = container_of(rcu,
648 struct rps_dev_flow_table, rcu);
650 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
651 schedule_work(&table->free_work);
654 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
655 struct rx_queue_attribute *attr,
656 const char *buf, size_t len)
660 struct rps_dev_flow_table *table, *old_table;
661 static DEFINE_SPINLOCK(rps_dev_flow_lock);
663 if (!capable(CAP_NET_ADMIN))
666 count = simple_strtoul(buf, &endp, 0);
674 /* Enforce a limit to prevent overflow */
677 count = roundup_pow_of_two(count);
678 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
682 table->mask = count - 1;
683 for (i = 0; i < count; i++)
684 table->flows[i].cpu = RPS_NO_CPU;
688 spin_lock(&rps_dev_flow_lock);
689 old_table = rcu_dereference_protected(queue->rps_flow_table,
690 lockdep_is_held(&rps_dev_flow_lock));
691 rcu_assign_pointer(queue->rps_flow_table, table);
692 spin_unlock(&rps_dev_flow_lock);
695 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
700 static struct rx_queue_attribute rps_cpus_attribute =
701 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
704 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
705 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
706 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
708 static struct attribute *rx_queue_default_attrs[] = {
709 &rps_cpus_attribute.attr,
710 &rps_dev_flow_table_cnt_attribute.attr,
714 static void rx_queue_release(struct kobject *kobj)
716 struct netdev_rx_queue *queue = to_rx_queue(kobj);
718 struct rps_dev_flow_table *flow_table;
721 map = rcu_dereference_raw(queue->rps_map);
723 RCU_INIT_POINTER(queue->rps_map, NULL);
727 flow_table = rcu_dereference_raw(queue->rps_flow_table);
729 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
730 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
733 memset(kobj, 0, sizeof(*kobj));
737 static struct kobj_type rx_queue_ktype = {
738 .sysfs_ops = &rx_queue_sysfs_ops,
739 .release = rx_queue_release,
740 .default_attrs = rx_queue_default_attrs,
743 static int rx_queue_add_kobject(struct net_device *net, int index)
745 struct netdev_rx_queue *queue = net->_rx + index;
746 struct kobject *kobj = &queue->kobj;
749 kobj->kset = net->queues_kset;
750 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
757 kobject_uevent(kobj, KOBJ_ADD);
758 dev_hold(queue->dev);
762 #endif /* CONFIG_RPS */
765 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
771 for (i = old_num; i < new_num; i++) {
772 error = rx_queue_add_kobject(net, i);
779 while (--i >= new_num)
780 kobject_put(&net->_rx[i].kobj);
790 * netdev_queue sysfs structures and functions.
792 struct netdev_queue_attribute {
793 struct attribute attr;
794 ssize_t (*show)(struct netdev_queue *queue,
795 struct netdev_queue_attribute *attr, char *buf);
796 ssize_t (*store)(struct netdev_queue *queue,
797 struct netdev_queue_attribute *attr, const char *buf, size_t len);
799 #define to_netdev_queue_attr(_attr) container_of(_attr, \
800 struct netdev_queue_attribute, attr)
802 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
804 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
805 struct attribute *attr, char *buf)
807 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
808 struct netdev_queue *queue = to_netdev_queue(kobj);
810 if (!attribute->show)
813 return attribute->show(queue, attribute, buf);
816 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
817 struct attribute *attr,
818 const char *buf, size_t count)
820 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
821 struct netdev_queue *queue = to_netdev_queue(kobj);
823 if (!attribute->store)
826 return attribute->store(queue, attribute, buf, count);
829 static const struct sysfs_ops netdev_queue_sysfs_ops = {
830 .show = netdev_queue_attr_show,
831 .store = netdev_queue_attr_store,
834 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
836 struct net_device *dev = queue->dev;
839 for (i = 0; i < dev->num_tx_queues; i++)
840 if (queue == &dev->_tx[i])
843 BUG_ON(i >= dev->num_tx_queues);
849 static ssize_t show_xps_map(struct netdev_queue *queue,
850 struct netdev_queue_attribute *attribute, char *buf)
852 struct net_device *dev = queue->dev;
853 struct xps_dev_maps *dev_maps;
859 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
862 index = get_netdev_queue_index(queue);
865 dev_maps = rcu_dereference(dev->xps_maps);
867 for_each_possible_cpu(i) {
868 struct xps_map *map =
869 rcu_dereference(dev_maps->cpu_map[i]);
872 for (j = 0; j < map->len; j++) {
873 if (map->queues[j] == index) {
874 cpumask_set_cpu(i, mask);
883 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
884 if (PAGE_SIZE - len < 3) {
885 free_cpumask_var(mask);
889 free_cpumask_var(mask);
890 len += sprintf(buf + len, "\n");
894 static void xps_dev_maps_release(struct rcu_head *rcu)
896 struct xps_dev_maps *dev_maps =
897 container_of(rcu, struct xps_dev_maps, rcu);
902 static DEFINE_MUTEX(xps_map_mutex);
903 #define xmap_dereference(P) \
904 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
906 static ssize_t store_xps_map(struct netdev_queue *queue,
907 struct netdev_queue_attribute *attribute,
908 const char *buf, size_t len)
910 struct net_device *dev = queue->dev;
912 int err, i, cpu, pos, map_len, alloc_len, need_set;
914 struct xps_map *map, *new_map;
915 struct xps_dev_maps *dev_maps, *new_dev_maps;
919 if (!capable(CAP_NET_ADMIN))
922 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
925 index = get_netdev_queue_index(queue);
927 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
929 free_cpumask_var(mask);
933 new_dev_maps = kzalloc(max_t(unsigned,
934 XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
936 free_cpumask_var(mask);
940 mutex_lock(&xps_map_mutex);
942 dev_maps = xmap_dereference(dev->xps_maps);
944 for_each_possible_cpu(cpu) {
946 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
949 for (pos = 0; pos < map->len; pos++)
950 if (map->queues[pos] == index)
953 alloc_len = map->alloc_len;
955 pos = map_len = alloc_len = 0;
957 need_set = cpu_isset(cpu, *mask) && cpu_online(cpu);
961 numa_node = cpu_to_node(cpu);
962 else if (numa_node != cpu_to_node(cpu))
966 if (need_set && pos >= map_len) {
967 /* Need to add queue to this CPU's map */
968 if (map_len >= alloc_len) {
969 alloc_len = alloc_len ?
970 2 * alloc_len : XPS_MIN_MAP_ALLOC;
971 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
976 new_map->alloc_len = alloc_len;
977 for (i = 0; i < map_len; i++)
978 new_map->queues[i] = map->queues[i];
979 new_map->len = map_len;
981 new_map->queues[new_map->len++] = index;
982 } else if (!need_set && pos < map_len) {
983 /* Need to remove queue from this CPU's map */
985 new_map->queues[pos] =
986 new_map->queues[--new_map->len];
990 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
993 /* Cleanup old maps */
994 for_each_possible_cpu(cpu) {
996 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
997 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
999 if (new_dev_maps->cpu_map[cpu])
1004 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
1006 kfree(new_dev_maps);
1007 rcu_assign_pointer(dev->xps_maps, NULL);
1011 call_rcu(&dev_maps->rcu, xps_dev_maps_release);
1013 netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node :
1016 mutex_unlock(&xps_map_mutex);
1018 free_cpumask_var(mask);
1022 mutex_unlock(&xps_map_mutex);
1025 for_each_possible_cpu(i)
1026 kfree(rcu_dereference_protected(
1027 new_dev_maps->cpu_map[i],
1029 kfree(new_dev_maps);
1030 free_cpumask_var(mask);
1034 static struct netdev_queue_attribute xps_cpus_attribute =
1035 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1037 static struct attribute *netdev_queue_default_attrs[] = {
1038 &xps_cpus_attribute.attr,
1042 static void netdev_queue_release(struct kobject *kobj)
1044 struct netdev_queue *queue = to_netdev_queue(kobj);
1045 struct net_device *dev = queue->dev;
1046 struct xps_dev_maps *dev_maps;
1047 struct xps_map *map;
1048 unsigned long index;
1049 int i, pos, nonempty = 0;
1051 index = get_netdev_queue_index(queue);
1053 mutex_lock(&xps_map_mutex);
1054 dev_maps = xmap_dereference(dev->xps_maps);
1057 for_each_possible_cpu(i) {
1058 map = xmap_dereference(dev_maps->cpu_map[i]);
1062 for (pos = 0; pos < map->len; pos++)
1063 if (map->queues[pos] == index)
1066 if (pos < map->len) {
1069 map->queues[--map->len];
1071 RCU_INIT_POINTER(dev_maps->cpu_map[i],
1073 kfree_rcu(map, rcu);
1082 RCU_INIT_POINTER(dev->xps_maps, NULL);
1083 call_rcu(&dev_maps->rcu, xps_dev_maps_release);
1087 mutex_unlock(&xps_map_mutex);
1089 memset(kobj, 0, sizeof(*kobj));
1090 dev_put(queue->dev);
1093 static struct kobj_type netdev_queue_ktype = {
1094 .sysfs_ops = &netdev_queue_sysfs_ops,
1095 .release = netdev_queue_release,
1096 .default_attrs = netdev_queue_default_attrs,
1099 static int netdev_queue_add_kobject(struct net_device *net, int index)
1101 struct netdev_queue *queue = net->_tx + index;
1102 struct kobject *kobj = &queue->kobj;
1105 kobj->kset = net->queues_kset;
1106 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1113 kobject_uevent(kobj, KOBJ_ADD);
1114 dev_hold(queue->dev);
1118 #endif /* CONFIG_XPS */
1121 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1127 for (i = old_num; i < new_num; i++) {
1128 error = netdev_queue_add_kobject(net, i);
1135 while (--i >= new_num)
1136 kobject_put(&net->_tx[i].kobj);
1144 static int register_queue_kobjects(struct net_device *net)
1146 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1148 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1149 net->queues_kset = kset_create_and_add("queues",
1150 NULL, &net->dev.kobj);
1151 if (!net->queues_kset)
1156 real_rx = net->real_num_rx_queues;
1158 real_tx = net->real_num_tx_queues;
1160 error = net_rx_queue_update_kobjects(net, 0, real_rx);
1165 error = netdev_queue_update_kobjects(net, 0, real_tx);
1173 netdev_queue_update_kobjects(net, txq, 0);
1174 net_rx_queue_update_kobjects(net, rxq, 0);
1178 static void remove_queue_kobjects(struct net_device *net)
1180 int real_rx = 0, real_tx = 0;
1183 real_rx = net->real_num_rx_queues;
1185 real_tx = net->real_num_tx_queues;
1187 net_rx_queue_update_kobjects(net, real_rx, 0);
1188 netdev_queue_update_kobjects(net, real_tx, 0);
1189 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1190 kset_unregister(net->queues_kset);
1194 static const void *net_current_ns(void)
1196 return current->nsproxy->net_ns;
1199 static const void *net_initial_ns(void)
1204 static const void *net_netlink_ns(struct sock *sk)
1206 return sock_net(sk);
1209 struct kobj_ns_type_operations net_ns_type_operations = {
1210 .type = KOBJ_NS_TYPE_NET,
1211 .current_ns = net_current_ns,
1212 .netlink_ns = net_netlink_ns,
1213 .initial_ns = net_initial_ns,
1215 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1217 static void net_kobj_ns_exit(struct net *net)
1219 kobj_ns_exit(KOBJ_NS_TYPE_NET, net);
1222 static struct pernet_operations kobj_net_ops = {
1223 .exit = net_kobj_ns_exit,
1227 #ifdef CONFIG_HOTPLUG
1228 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1230 struct net_device *dev = to_net_dev(d);
1233 /* pass interface to uevent. */
1234 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1238 /* pass ifindex to uevent.
1239 * ifindex is useful as it won't change (interface name may change)
1240 * and is what RtNetlink uses natively. */
1241 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1249 * netdev_release -- destroy and free a dead device.
1250 * Called when last reference to device kobject is gone.
1252 static void netdev_release(struct device *d)
1254 struct net_device *dev = to_net_dev(d);
1256 BUG_ON(dev->reg_state != NETREG_RELEASED);
1258 kfree(dev->ifalias);
1259 kfree((char *)dev - dev->padded);
1262 static const void *net_namespace(struct device *d)
1264 struct net_device *dev;
1265 dev = container_of(d, struct net_device, dev);
1266 return dev_net(dev);
1269 static struct class net_class = {
1271 .dev_release = netdev_release,
1273 .dev_attrs = net_class_attributes,
1274 #endif /* CONFIG_SYSFS */
1275 #ifdef CONFIG_HOTPLUG
1276 .dev_uevent = netdev_uevent,
1278 .ns_type = &net_ns_type_operations,
1279 .namespace = net_namespace,
1282 /* Delete sysfs entries but hold kobject reference until after all
1283 * netdev references are gone.
1285 void netdev_unregister_kobject(struct net_device * net)
1287 struct device *dev = &(net->dev);
1289 kobject_get(&dev->kobj);
1291 remove_queue_kobjects(net);
1296 /* Create sysfs entries for network device. */
1297 int netdev_register_kobject(struct net_device *net)
1299 struct device *dev = &(net->dev);
1300 const struct attribute_group **groups = net->sysfs_groups;
1303 device_initialize(dev);
1304 dev->class = &net_class;
1305 dev->platform_data = net;
1306 dev->groups = groups;
1308 dev_set_name(dev, "%s", net->name);
1311 /* Allow for a device specific group */
1315 *groups++ = &netstat_group;
1316 #ifdef CONFIG_WIRELESS_EXT_SYSFS
1317 if (net->ieee80211_ptr)
1318 *groups++ = &wireless_group;
1319 #ifdef CONFIG_WIRELESS_EXT
1320 else if (net->wireless_handlers)
1321 *groups++ = &wireless_group;
1324 #endif /* CONFIG_SYSFS */
1326 error = device_add(dev);
1330 error = register_queue_kobjects(net);
1339 int netdev_class_create_file(struct class_attribute *class_attr)
1341 return class_create_file(&net_class, class_attr);
1343 EXPORT_SYMBOL(netdev_class_create_file);
1345 void netdev_class_remove_file(struct class_attribute *class_attr)
1347 class_remove_file(&net_class, class_attr);
1349 EXPORT_SYMBOL(netdev_class_remove_file);
1351 int netdev_kobject_init(void)
1353 kobj_ns_type_register(&net_ns_type_operations);
1354 register_pernet_subsys(&kobj_net_ops);
1355 return class_register(&net_class);