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_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 *net = to_net_dev(dev);
79 if (!capable(CAP_NET_ADMIN))
82 new = simple_strtoul(buf, &endp, 0);
87 return restart_syscall();
89 if (dev_isalive(net)) {
90 if ((ret = (*set)(net, 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(features, fmt_hex);
104 NETDEVICE_SHOW(type, fmt_dec);
105 NETDEVICE_SHOW(link_mode, fmt_dec);
107 /* use same locking rules as GIFHWADDR ioctl's */
108 static ssize_t show_address(struct device *dev, struct device_attribute *attr,
111 struct net_device *net = to_net_dev(dev);
112 ssize_t ret = -EINVAL;
114 read_lock(&dev_base_lock);
115 if (dev_isalive(net))
116 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
117 read_unlock(&dev_base_lock);
121 static ssize_t show_broadcast(struct device *dev,
122 struct device_attribute *attr, char *buf)
124 struct net_device *net = to_net_dev(dev);
125 if (dev_isalive(net))
126 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
130 static ssize_t show_carrier(struct device *dev,
131 struct device_attribute *attr, char *buf)
133 struct net_device *netdev = to_net_dev(dev);
134 if (netif_running(netdev)) {
135 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
140 static ssize_t show_speed(struct device *dev,
141 struct device_attribute *attr, char *buf)
143 struct net_device *netdev = to_net_dev(dev);
147 return restart_syscall();
149 if (netif_running(netdev)) {
150 struct ethtool_cmd cmd;
151 if (!dev_ethtool_get_settings(netdev, &cmd))
152 ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
158 static ssize_t show_duplex(struct device *dev,
159 struct device_attribute *attr, char *buf)
161 struct net_device *netdev = to_net_dev(dev);
165 return restart_syscall();
167 if (netif_running(netdev)) {
168 struct ethtool_cmd cmd;
169 if (!dev_ethtool_get_settings(netdev, &cmd))
170 ret = sprintf(buf, "%s\n",
171 cmd.duplex ? "full" : "half");
177 static ssize_t show_dormant(struct device *dev,
178 struct device_attribute *attr, char *buf)
180 struct net_device *netdev = to_net_dev(dev);
182 if (netif_running(netdev))
183 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
188 static const char *const operstates[] = {
190 "notpresent", /* currently unused */
193 "testing", /* currently unused */
198 static ssize_t show_operstate(struct device *dev,
199 struct device_attribute *attr, char *buf)
201 const struct net_device *netdev = to_net_dev(dev);
202 unsigned char operstate;
204 read_lock(&dev_base_lock);
205 operstate = netdev->operstate;
206 if (!netif_running(netdev))
207 operstate = IF_OPER_DOWN;
208 read_unlock(&dev_base_lock);
210 if (operstate >= ARRAY_SIZE(operstates))
211 return -EINVAL; /* should not happen */
213 return sprintf(buf, "%s\n", operstates[operstate]);
216 /* read-write attributes */
217 NETDEVICE_SHOW(mtu, fmt_dec);
219 static int change_mtu(struct net_device *net, unsigned long new_mtu)
221 return dev_set_mtu(net, (int) new_mtu);
224 static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
225 const char *buf, size_t len)
227 return netdev_store(dev, attr, buf, len, change_mtu);
230 NETDEVICE_SHOW(flags, fmt_hex);
232 static int change_flags(struct net_device *net, unsigned long new_flags)
234 return dev_change_flags(net, (unsigned) new_flags);
237 static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
238 const char *buf, size_t len)
240 return netdev_store(dev, attr, buf, len, change_flags);
243 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
245 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
247 net->tx_queue_len = new_len;
251 static ssize_t store_tx_queue_len(struct device *dev,
252 struct device_attribute *attr,
253 const char *buf, size_t len)
255 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
258 static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
259 const char *buf, size_t len)
261 struct net_device *netdev = to_net_dev(dev);
265 if (!capable(CAP_NET_ADMIN))
268 /* ignore trailing newline */
269 if (len > 0 && buf[len - 1] == '\n')
273 return restart_syscall();
274 ret = dev_set_alias(netdev, buf, count);
277 return ret < 0 ? ret : len;
280 static ssize_t show_ifalias(struct device *dev,
281 struct device_attribute *attr, char *buf)
283 const struct net_device *netdev = to_net_dev(dev);
287 return restart_syscall();
289 ret = sprintf(buf, "%s\n", netdev->ifalias);
294 NETDEVICE_SHOW(group, fmt_dec);
296 static int change_group(struct net_device *net, unsigned long new_group)
298 dev_set_group(net, (int) new_group);
302 static ssize_t store_group(struct device *dev, struct device_attribute *attr,
303 const char *buf, size_t len)
305 return netdev_store(dev, attr, buf, len, change_group);
308 static struct device_attribute net_class_attributes[] = {
309 __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
310 __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
311 __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
312 __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
313 __ATTR(iflink, S_IRUGO, show_iflink, NULL),
314 __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
315 __ATTR(features, S_IRUGO, show_features, NULL),
316 __ATTR(type, S_IRUGO, show_type, NULL),
317 __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
318 __ATTR(address, S_IRUGO, show_address, NULL),
319 __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
320 __ATTR(carrier, S_IRUGO, show_carrier, NULL),
321 __ATTR(speed, S_IRUGO, show_speed, NULL),
322 __ATTR(duplex, S_IRUGO, show_duplex, NULL),
323 __ATTR(dormant, S_IRUGO, show_dormant, NULL),
324 __ATTR(operstate, S_IRUGO, show_operstate, NULL),
325 __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
326 __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
327 __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
329 __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
333 /* Show a given an attribute in the statistics group */
334 static ssize_t netstat_show(const struct device *d,
335 struct device_attribute *attr, char *buf,
336 unsigned long offset)
338 struct net_device *dev = to_net_dev(d);
339 ssize_t ret = -EINVAL;
341 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
342 offset % sizeof(u64) != 0);
344 read_lock(&dev_base_lock);
345 if (dev_isalive(dev)) {
346 struct rtnl_link_stats64 temp;
347 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
349 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
351 read_unlock(&dev_base_lock);
355 /* generate a read-only statistics attribute */
356 #define NETSTAT_ENTRY(name) \
357 static ssize_t show_##name(struct device *d, \
358 struct device_attribute *attr, char *buf) \
360 return netstat_show(d, attr, buf, \
361 offsetof(struct rtnl_link_stats64, name)); \
363 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
365 NETSTAT_ENTRY(rx_packets);
366 NETSTAT_ENTRY(tx_packets);
367 NETSTAT_ENTRY(rx_bytes);
368 NETSTAT_ENTRY(tx_bytes);
369 NETSTAT_ENTRY(rx_errors);
370 NETSTAT_ENTRY(tx_errors);
371 NETSTAT_ENTRY(rx_dropped);
372 NETSTAT_ENTRY(tx_dropped);
373 NETSTAT_ENTRY(multicast);
374 NETSTAT_ENTRY(collisions);
375 NETSTAT_ENTRY(rx_length_errors);
376 NETSTAT_ENTRY(rx_over_errors);
377 NETSTAT_ENTRY(rx_crc_errors);
378 NETSTAT_ENTRY(rx_frame_errors);
379 NETSTAT_ENTRY(rx_fifo_errors);
380 NETSTAT_ENTRY(rx_missed_errors);
381 NETSTAT_ENTRY(tx_aborted_errors);
382 NETSTAT_ENTRY(tx_carrier_errors);
383 NETSTAT_ENTRY(tx_fifo_errors);
384 NETSTAT_ENTRY(tx_heartbeat_errors);
385 NETSTAT_ENTRY(tx_window_errors);
386 NETSTAT_ENTRY(rx_compressed);
387 NETSTAT_ENTRY(tx_compressed);
389 static struct attribute *netstat_attrs[] = {
390 &dev_attr_rx_packets.attr,
391 &dev_attr_tx_packets.attr,
392 &dev_attr_rx_bytes.attr,
393 &dev_attr_tx_bytes.attr,
394 &dev_attr_rx_errors.attr,
395 &dev_attr_tx_errors.attr,
396 &dev_attr_rx_dropped.attr,
397 &dev_attr_tx_dropped.attr,
398 &dev_attr_multicast.attr,
399 &dev_attr_collisions.attr,
400 &dev_attr_rx_length_errors.attr,
401 &dev_attr_rx_over_errors.attr,
402 &dev_attr_rx_crc_errors.attr,
403 &dev_attr_rx_frame_errors.attr,
404 &dev_attr_rx_fifo_errors.attr,
405 &dev_attr_rx_missed_errors.attr,
406 &dev_attr_tx_aborted_errors.attr,
407 &dev_attr_tx_carrier_errors.attr,
408 &dev_attr_tx_fifo_errors.attr,
409 &dev_attr_tx_heartbeat_errors.attr,
410 &dev_attr_tx_window_errors.attr,
411 &dev_attr_rx_compressed.attr,
412 &dev_attr_tx_compressed.attr,
417 static struct attribute_group netstat_group = {
418 .name = "statistics",
419 .attrs = netstat_attrs,
422 #ifdef CONFIG_WIRELESS_EXT_SYSFS
423 /* helper function that does all the locking etc for wireless stats */
424 static ssize_t wireless_show(struct device *d, char *buf,
425 ssize_t (*format)(const struct iw_statistics *,
428 struct net_device *dev = to_net_dev(d);
429 const struct iw_statistics *iw;
430 ssize_t ret = -EINVAL;
433 return restart_syscall();
434 if (dev_isalive(dev)) {
435 iw = get_wireless_stats(dev);
437 ret = (*format)(iw, buf);
444 /* show function template for wireless fields */
445 #define WIRELESS_SHOW(name, field, format_string) \
446 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
448 return sprintf(buf, format_string, iw->field); \
450 static ssize_t show_iw_##name(struct device *d, \
451 struct device_attribute *attr, char *buf) \
453 return wireless_show(d, buf, format_iw_##name); \
455 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
457 WIRELESS_SHOW(status, status, fmt_hex);
458 WIRELESS_SHOW(link, qual.qual, fmt_dec);
459 WIRELESS_SHOW(level, qual.level, fmt_dec);
460 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
461 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
462 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
463 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
464 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
465 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
466 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
468 static struct attribute *wireless_attrs[] = {
469 &dev_attr_status.attr,
471 &dev_attr_level.attr,
472 &dev_attr_noise.attr,
474 &dev_attr_crypt.attr,
475 &dev_attr_fragment.attr,
476 &dev_attr_retries.attr,
478 &dev_attr_beacon.attr,
482 static struct attribute_group wireless_group = {
484 .attrs = wireless_attrs,
487 #endif /* CONFIG_SYSFS */
491 * RX queue sysfs structures and functions.
493 struct rx_queue_attribute {
494 struct attribute attr;
495 ssize_t (*show)(struct netdev_rx_queue *queue,
496 struct rx_queue_attribute *attr, char *buf);
497 ssize_t (*store)(struct netdev_rx_queue *queue,
498 struct rx_queue_attribute *attr, const char *buf, size_t len);
500 #define to_rx_queue_attr(_attr) container_of(_attr, \
501 struct rx_queue_attribute, attr)
503 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
505 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
508 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
509 struct netdev_rx_queue *queue = to_rx_queue(kobj);
511 if (!attribute->show)
514 return attribute->show(queue, attribute, buf);
517 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
518 const char *buf, size_t count)
520 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
521 struct netdev_rx_queue *queue = to_rx_queue(kobj);
523 if (!attribute->store)
526 return attribute->store(queue, attribute, buf, count);
529 static const struct sysfs_ops rx_queue_sysfs_ops = {
530 .show = rx_queue_attr_show,
531 .store = rx_queue_attr_store,
534 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
535 struct rx_queue_attribute *attribute, char *buf)
542 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
546 map = rcu_dereference(queue->rps_map);
548 for (i = 0; i < map->len; i++)
549 cpumask_set_cpu(map->cpus[i], mask);
551 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
552 if (PAGE_SIZE - len < 3) {
554 free_cpumask_var(mask);
559 free_cpumask_var(mask);
560 len += sprintf(buf + len, "\n");
564 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
565 struct rx_queue_attribute *attribute,
566 const char *buf, size_t len)
568 struct rps_map *old_map, *map;
571 static DEFINE_SPINLOCK(rps_map_lock);
573 if (!capable(CAP_NET_ADMIN))
576 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
579 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
581 free_cpumask_var(mask);
585 map = kzalloc(max_t(unsigned,
586 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
589 free_cpumask_var(mask);
594 for_each_cpu_and(cpu, mask, cpu_online_mask)
595 map->cpus[i++] = cpu;
604 spin_lock(&rps_map_lock);
605 old_map = rcu_dereference_protected(queue->rps_map,
606 lockdep_is_held(&rps_map_lock));
607 rcu_assign_pointer(queue->rps_map, map);
608 spin_unlock(&rps_map_lock);
611 kfree_rcu(old_map, rcu);
613 free_cpumask_var(mask);
617 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
618 struct rx_queue_attribute *attr,
621 struct rps_dev_flow_table *flow_table;
622 unsigned int val = 0;
625 flow_table = rcu_dereference(queue->rps_flow_table);
627 val = flow_table->mask + 1;
630 return sprintf(buf, "%u\n", val);
633 static void rps_dev_flow_table_release_work(struct work_struct *work)
635 struct rps_dev_flow_table *table = container_of(work,
636 struct rps_dev_flow_table, free_work);
641 static void rps_dev_flow_table_release(struct rcu_head *rcu)
643 struct rps_dev_flow_table *table = container_of(rcu,
644 struct rps_dev_flow_table, rcu);
646 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
647 schedule_work(&table->free_work);
650 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
651 struct rx_queue_attribute *attr,
652 const char *buf, size_t len)
656 struct rps_dev_flow_table *table, *old_table;
657 static DEFINE_SPINLOCK(rps_dev_flow_lock);
659 if (!capable(CAP_NET_ADMIN))
662 count = simple_strtoul(buf, &endp, 0);
670 /* Enforce a limit to prevent overflow */
673 count = roundup_pow_of_two(count);
674 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
678 table->mask = count - 1;
679 for (i = 0; i < count; i++)
680 table->flows[i].cpu = RPS_NO_CPU;
684 spin_lock(&rps_dev_flow_lock);
685 old_table = rcu_dereference_protected(queue->rps_flow_table,
686 lockdep_is_held(&rps_dev_flow_lock));
687 rcu_assign_pointer(queue->rps_flow_table, table);
688 spin_unlock(&rps_dev_flow_lock);
691 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
696 static struct rx_queue_attribute rps_cpus_attribute =
697 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
700 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
701 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
702 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
704 static struct attribute *rx_queue_default_attrs[] = {
705 &rps_cpus_attribute.attr,
706 &rps_dev_flow_table_cnt_attribute.attr,
710 static void rx_queue_release(struct kobject *kobj)
712 struct netdev_rx_queue *queue = to_rx_queue(kobj);
714 struct rps_dev_flow_table *flow_table;
717 map = rcu_dereference_raw(queue->rps_map);
719 RCU_INIT_POINTER(queue->rps_map, NULL);
723 flow_table = rcu_dereference_raw(queue->rps_flow_table);
725 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
726 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
729 memset(kobj, 0, sizeof(*kobj));
733 static struct kobj_type rx_queue_ktype = {
734 .sysfs_ops = &rx_queue_sysfs_ops,
735 .release = rx_queue_release,
736 .default_attrs = rx_queue_default_attrs,
739 static int rx_queue_add_kobject(struct net_device *net, int index)
741 struct netdev_rx_queue *queue = net->_rx + index;
742 struct kobject *kobj = &queue->kobj;
745 kobj->kset = net->queues_kset;
746 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
753 kobject_uevent(kobj, KOBJ_ADD);
754 dev_hold(queue->dev);
758 #endif /* CONFIG_RPS */
761 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
767 for (i = old_num; i < new_num; i++) {
768 error = rx_queue_add_kobject(net, i);
775 while (--i >= new_num)
776 kobject_put(&net->_rx[i].kobj);
786 * netdev_queue sysfs structures and functions.
788 struct netdev_queue_attribute {
789 struct attribute attr;
790 ssize_t (*show)(struct netdev_queue *queue,
791 struct netdev_queue_attribute *attr, char *buf);
792 ssize_t (*store)(struct netdev_queue *queue,
793 struct netdev_queue_attribute *attr, const char *buf, size_t len);
795 #define to_netdev_queue_attr(_attr) container_of(_attr, \
796 struct netdev_queue_attribute, attr)
798 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
800 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
801 struct attribute *attr, char *buf)
803 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
804 struct netdev_queue *queue = to_netdev_queue(kobj);
806 if (!attribute->show)
809 return attribute->show(queue, attribute, buf);
812 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
813 struct attribute *attr,
814 const char *buf, size_t count)
816 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
817 struct netdev_queue *queue = to_netdev_queue(kobj);
819 if (!attribute->store)
822 return attribute->store(queue, attribute, buf, count);
825 static const struct sysfs_ops netdev_queue_sysfs_ops = {
826 .show = netdev_queue_attr_show,
827 .store = netdev_queue_attr_store,
830 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
832 struct net_device *dev = queue->dev;
835 for (i = 0; i < dev->num_tx_queues; i++)
836 if (queue == &dev->_tx[i])
839 BUG_ON(i >= dev->num_tx_queues);
845 static ssize_t show_xps_map(struct netdev_queue *queue,
846 struct netdev_queue_attribute *attribute, char *buf)
848 struct net_device *dev = queue->dev;
849 struct xps_dev_maps *dev_maps;
855 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
858 index = get_netdev_queue_index(queue);
861 dev_maps = rcu_dereference(dev->xps_maps);
863 for_each_possible_cpu(i) {
864 struct xps_map *map =
865 rcu_dereference(dev_maps->cpu_map[i]);
868 for (j = 0; j < map->len; j++) {
869 if (map->queues[j] == index) {
870 cpumask_set_cpu(i, mask);
879 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
880 if (PAGE_SIZE - len < 3) {
881 free_cpumask_var(mask);
885 free_cpumask_var(mask);
886 len += sprintf(buf + len, "\n");
890 static DEFINE_MUTEX(xps_map_mutex);
891 #define xmap_dereference(P) \
892 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
894 static ssize_t store_xps_map(struct netdev_queue *queue,
895 struct netdev_queue_attribute *attribute,
896 const char *buf, size_t len)
898 struct net_device *dev = queue->dev;
900 int err, i, cpu, pos, map_len, alloc_len, need_set;
902 struct xps_map *map, *new_map;
903 struct xps_dev_maps *dev_maps, *new_dev_maps;
907 if (!capable(CAP_NET_ADMIN))
910 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
913 index = get_netdev_queue_index(queue);
915 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
917 free_cpumask_var(mask);
921 new_dev_maps = kzalloc(max_t(unsigned,
922 XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
924 free_cpumask_var(mask);
928 mutex_lock(&xps_map_mutex);
930 dev_maps = xmap_dereference(dev->xps_maps);
932 for_each_possible_cpu(cpu) {
934 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
937 for (pos = 0; pos < map->len; pos++)
938 if (map->queues[pos] == index)
941 alloc_len = map->alloc_len;
943 pos = map_len = alloc_len = 0;
945 need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu);
949 numa_node = cpu_to_node(cpu);
950 else if (numa_node != cpu_to_node(cpu))
954 if (need_set && pos >= map_len) {
955 /* Need to add queue to this CPU's map */
956 if (map_len >= alloc_len) {
957 alloc_len = alloc_len ?
958 2 * alloc_len : XPS_MIN_MAP_ALLOC;
959 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
964 new_map->alloc_len = alloc_len;
965 for (i = 0; i < map_len; i++)
966 new_map->queues[i] = map->queues[i];
967 new_map->len = map_len;
969 new_map->queues[new_map->len++] = index;
970 } else if (!need_set && pos < map_len) {
971 /* Need to remove queue from this CPU's map */
973 new_map->queues[pos] =
974 new_map->queues[--new_map->len];
978 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
981 /* Cleanup old maps */
982 for_each_possible_cpu(cpu) {
984 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
985 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
987 if (new_dev_maps->cpu_map[cpu])
992 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
995 rcu_assign_pointer(dev->xps_maps, NULL);
999 kfree_rcu(dev_maps, rcu);
1001 netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node :
1004 mutex_unlock(&xps_map_mutex);
1006 free_cpumask_var(mask);
1010 mutex_unlock(&xps_map_mutex);
1013 for_each_possible_cpu(i)
1014 kfree(rcu_dereference_protected(
1015 new_dev_maps->cpu_map[i],
1017 kfree(new_dev_maps);
1018 free_cpumask_var(mask);
1022 static struct netdev_queue_attribute xps_cpus_attribute =
1023 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1025 static struct attribute *netdev_queue_default_attrs[] = {
1026 &xps_cpus_attribute.attr,
1030 static void netdev_queue_release(struct kobject *kobj)
1032 struct netdev_queue *queue = to_netdev_queue(kobj);
1033 struct net_device *dev = queue->dev;
1034 struct xps_dev_maps *dev_maps;
1035 struct xps_map *map;
1036 unsigned long index;
1037 int i, pos, nonempty = 0;
1039 index = get_netdev_queue_index(queue);
1041 mutex_lock(&xps_map_mutex);
1042 dev_maps = xmap_dereference(dev->xps_maps);
1045 for_each_possible_cpu(i) {
1046 map = xmap_dereference(dev_maps->cpu_map[i]);
1050 for (pos = 0; pos < map->len; pos++)
1051 if (map->queues[pos] == index)
1054 if (pos < map->len) {
1057 map->queues[--map->len];
1059 RCU_INIT_POINTER(dev_maps->cpu_map[i],
1061 kfree_rcu(map, rcu);
1070 RCU_INIT_POINTER(dev->xps_maps, NULL);
1071 kfree_rcu(dev_maps, rcu);
1075 mutex_unlock(&xps_map_mutex);
1077 memset(kobj, 0, sizeof(*kobj));
1078 dev_put(queue->dev);
1081 static struct kobj_type netdev_queue_ktype = {
1082 .sysfs_ops = &netdev_queue_sysfs_ops,
1083 .release = netdev_queue_release,
1084 .default_attrs = netdev_queue_default_attrs,
1087 static int netdev_queue_add_kobject(struct net_device *net, int index)
1089 struct netdev_queue *queue = net->_tx + index;
1090 struct kobject *kobj = &queue->kobj;
1093 kobj->kset = net->queues_kset;
1094 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1101 kobject_uevent(kobj, KOBJ_ADD);
1102 dev_hold(queue->dev);
1106 #endif /* CONFIG_XPS */
1109 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1115 for (i = old_num; i < new_num; i++) {
1116 error = netdev_queue_add_kobject(net, i);
1123 while (--i >= new_num)
1124 kobject_put(&net->_tx[i].kobj);
1132 static int register_queue_kobjects(struct net_device *net)
1134 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1136 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1137 net->queues_kset = kset_create_and_add("queues",
1138 NULL, &net->dev.kobj);
1139 if (!net->queues_kset)
1144 real_rx = net->real_num_rx_queues;
1146 real_tx = net->real_num_tx_queues;
1148 error = net_rx_queue_update_kobjects(net, 0, real_rx);
1153 error = netdev_queue_update_kobjects(net, 0, real_tx);
1161 netdev_queue_update_kobjects(net, txq, 0);
1162 net_rx_queue_update_kobjects(net, rxq, 0);
1166 static void remove_queue_kobjects(struct net_device *net)
1168 int real_rx = 0, real_tx = 0;
1171 real_rx = net->real_num_rx_queues;
1173 real_tx = net->real_num_tx_queues;
1175 net_rx_queue_update_kobjects(net, real_rx, 0);
1176 netdev_queue_update_kobjects(net, real_tx, 0);
1177 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1178 kset_unregister(net->queues_kset);
1182 static const void *net_current_ns(void)
1184 return current->nsproxy->net_ns;
1187 static const void *net_initial_ns(void)
1192 static const void *net_netlink_ns(struct sock *sk)
1194 return sock_net(sk);
1197 struct kobj_ns_type_operations net_ns_type_operations = {
1198 .type = KOBJ_NS_TYPE_NET,
1199 .current_ns = net_current_ns,
1200 .netlink_ns = net_netlink_ns,
1201 .initial_ns = net_initial_ns,
1203 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1205 static void net_kobj_ns_exit(struct net *net)
1207 kobj_ns_exit(KOBJ_NS_TYPE_NET, net);
1210 static struct pernet_operations kobj_net_ops = {
1211 .exit = net_kobj_ns_exit,
1215 #ifdef CONFIG_HOTPLUG
1216 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1218 struct net_device *dev = to_net_dev(d);
1221 /* pass interface to uevent. */
1222 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1226 /* pass ifindex to uevent.
1227 * ifindex is useful as it won't change (interface name may change)
1228 * and is what RtNetlink uses natively. */
1229 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1237 * netdev_release -- destroy and free a dead device.
1238 * Called when last reference to device kobject is gone.
1240 static void netdev_release(struct device *d)
1242 struct net_device *dev = to_net_dev(d);
1244 BUG_ON(dev->reg_state != NETREG_RELEASED);
1246 kfree(dev->ifalias);
1247 kfree((char *)dev - dev->padded);
1250 static const void *net_namespace(struct device *d)
1252 struct net_device *dev;
1253 dev = container_of(d, struct net_device, dev);
1254 return dev_net(dev);
1257 static struct class net_class = {
1259 .dev_release = netdev_release,
1261 .dev_attrs = net_class_attributes,
1262 #endif /* CONFIG_SYSFS */
1263 #ifdef CONFIG_HOTPLUG
1264 .dev_uevent = netdev_uevent,
1266 .ns_type = &net_ns_type_operations,
1267 .namespace = net_namespace,
1270 /* Delete sysfs entries but hold kobject reference until after all
1271 * netdev references are gone.
1273 void netdev_unregister_kobject(struct net_device * net)
1275 struct device *dev = &(net->dev);
1277 kobject_get(&dev->kobj);
1279 remove_queue_kobjects(net);
1284 /* Create sysfs entries for network device. */
1285 int netdev_register_kobject(struct net_device *net)
1287 struct device *dev = &(net->dev);
1288 const struct attribute_group **groups = net->sysfs_groups;
1291 device_initialize(dev);
1292 dev->class = &net_class;
1293 dev->platform_data = net;
1294 dev->groups = groups;
1296 dev_set_name(dev, "%s", net->name);
1299 /* Allow for a device specific group */
1303 *groups++ = &netstat_group;
1304 #ifdef CONFIG_WIRELESS_EXT_SYSFS
1305 if (net->ieee80211_ptr)
1306 *groups++ = &wireless_group;
1307 #ifdef CONFIG_WIRELESS_EXT
1308 else if (net->wireless_handlers)
1309 *groups++ = &wireless_group;
1312 #endif /* CONFIG_SYSFS */
1314 error = device_add(dev);
1318 error = register_queue_kobjects(net);
1327 int netdev_class_create_file(struct class_attribute *class_attr)
1329 return class_create_file(&net_class, class_attr);
1331 EXPORT_SYMBOL(netdev_class_create_file);
1333 void netdev_class_remove_file(struct class_attribute *class_attr)
1335 class_remove_file(&net_class, class_attr);
1337 EXPORT_SYMBOL(netdev_class_remove_file);
1339 int netdev_kobject_init(void)
1341 kobj_ns_type_register(&net_ns_type_operations);
1342 register_pernet_subsys(&kobj_net_ops);
1343 return class_register(&net_class);