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_long_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 static struct device_attribute net_class_attributes[] = {
299 __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
300 __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
301 __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
302 __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
303 __ATTR(iflink, S_IRUGO, show_iflink, NULL),
304 __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
305 __ATTR(features, S_IRUGO, show_features, NULL),
306 __ATTR(type, S_IRUGO, show_type, NULL),
307 __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
308 __ATTR(address, S_IRUGO, show_address, NULL),
309 __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
310 __ATTR(carrier, S_IRUGO, show_carrier, NULL),
311 __ATTR(speed, S_IRUGO, show_speed, NULL),
312 __ATTR(duplex, S_IRUGO, show_duplex, NULL),
313 __ATTR(dormant, S_IRUGO, show_dormant, NULL),
314 __ATTR(operstate, S_IRUGO, show_operstate, NULL),
315 __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
316 __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
317 __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
322 /* Show a given an attribute in the statistics group */
323 static ssize_t netstat_show(const struct device *d,
324 struct device_attribute *attr, char *buf,
325 unsigned long offset)
327 struct net_device *dev = to_net_dev(d);
328 ssize_t ret = -EINVAL;
330 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
331 offset % sizeof(u64) != 0);
333 read_lock(&dev_base_lock);
334 if (dev_isalive(dev)) {
335 struct rtnl_link_stats64 temp;
336 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
338 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
340 read_unlock(&dev_base_lock);
344 /* generate a read-only statistics attribute */
345 #define NETSTAT_ENTRY(name) \
346 static ssize_t show_##name(struct device *d, \
347 struct device_attribute *attr, char *buf) \
349 return netstat_show(d, attr, buf, \
350 offsetof(struct rtnl_link_stats64, name)); \
352 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
354 NETSTAT_ENTRY(rx_packets);
355 NETSTAT_ENTRY(tx_packets);
356 NETSTAT_ENTRY(rx_bytes);
357 NETSTAT_ENTRY(tx_bytes);
358 NETSTAT_ENTRY(rx_errors);
359 NETSTAT_ENTRY(tx_errors);
360 NETSTAT_ENTRY(rx_dropped);
361 NETSTAT_ENTRY(tx_dropped);
362 NETSTAT_ENTRY(multicast);
363 NETSTAT_ENTRY(collisions);
364 NETSTAT_ENTRY(rx_length_errors);
365 NETSTAT_ENTRY(rx_over_errors);
366 NETSTAT_ENTRY(rx_crc_errors);
367 NETSTAT_ENTRY(rx_frame_errors);
368 NETSTAT_ENTRY(rx_fifo_errors);
369 NETSTAT_ENTRY(rx_missed_errors);
370 NETSTAT_ENTRY(tx_aborted_errors);
371 NETSTAT_ENTRY(tx_carrier_errors);
372 NETSTAT_ENTRY(tx_fifo_errors);
373 NETSTAT_ENTRY(tx_heartbeat_errors);
374 NETSTAT_ENTRY(tx_window_errors);
375 NETSTAT_ENTRY(rx_compressed);
376 NETSTAT_ENTRY(tx_compressed);
378 static struct attribute *netstat_attrs[] = {
379 &dev_attr_rx_packets.attr,
380 &dev_attr_tx_packets.attr,
381 &dev_attr_rx_bytes.attr,
382 &dev_attr_tx_bytes.attr,
383 &dev_attr_rx_errors.attr,
384 &dev_attr_tx_errors.attr,
385 &dev_attr_rx_dropped.attr,
386 &dev_attr_tx_dropped.attr,
387 &dev_attr_multicast.attr,
388 &dev_attr_collisions.attr,
389 &dev_attr_rx_length_errors.attr,
390 &dev_attr_rx_over_errors.attr,
391 &dev_attr_rx_crc_errors.attr,
392 &dev_attr_rx_frame_errors.attr,
393 &dev_attr_rx_fifo_errors.attr,
394 &dev_attr_rx_missed_errors.attr,
395 &dev_attr_tx_aborted_errors.attr,
396 &dev_attr_tx_carrier_errors.attr,
397 &dev_attr_tx_fifo_errors.attr,
398 &dev_attr_tx_heartbeat_errors.attr,
399 &dev_attr_tx_window_errors.attr,
400 &dev_attr_rx_compressed.attr,
401 &dev_attr_tx_compressed.attr,
406 static struct attribute_group netstat_group = {
407 .name = "statistics",
408 .attrs = netstat_attrs,
411 #ifdef CONFIG_WIRELESS_EXT_SYSFS
412 /* helper function that does all the locking etc for wireless stats */
413 static ssize_t wireless_show(struct device *d, char *buf,
414 ssize_t (*format)(const struct iw_statistics *,
417 struct net_device *dev = to_net_dev(d);
418 const struct iw_statistics *iw;
419 ssize_t ret = -EINVAL;
422 return restart_syscall();
423 if (dev_isalive(dev)) {
424 iw = get_wireless_stats(dev);
426 ret = (*format)(iw, buf);
433 /* show function template for wireless fields */
434 #define WIRELESS_SHOW(name, field, format_string) \
435 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
437 return sprintf(buf, format_string, iw->field); \
439 static ssize_t show_iw_##name(struct device *d, \
440 struct device_attribute *attr, char *buf) \
442 return wireless_show(d, buf, format_iw_##name); \
444 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
446 WIRELESS_SHOW(status, status, fmt_hex);
447 WIRELESS_SHOW(link, qual.qual, fmt_dec);
448 WIRELESS_SHOW(level, qual.level, fmt_dec);
449 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
450 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
451 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
452 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
453 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
454 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
455 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
457 static struct attribute *wireless_attrs[] = {
458 &dev_attr_status.attr,
460 &dev_attr_level.attr,
461 &dev_attr_noise.attr,
463 &dev_attr_crypt.attr,
464 &dev_attr_fragment.attr,
465 &dev_attr_retries.attr,
467 &dev_attr_beacon.attr,
471 static struct attribute_group wireless_group = {
473 .attrs = wireless_attrs,
476 #endif /* CONFIG_SYSFS */
480 * RX queue sysfs structures and functions.
482 struct rx_queue_attribute {
483 struct attribute attr;
484 ssize_t (*show)(struct netdev_rx_queue *queue,
485 struct rx_queue_attribute *attr, char *buf);
486 ssize_t (*store)(struct netdev_rx_queue *queue,
487 struct rx_queue_attribute *attr, const char *buf, size_t len);
489 #define to_rx_queue_attr(_attr) container_of(_attr, \
490 struct rx_queue_attribute, attr)
492 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
494 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
497 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
498 struct netdev_rx_queue *queue = to_rx_queue(kobj);
500 if (!attribute->show)
503 return attribute->show(queue, attribute, buf);
506 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
507 const char *buf, size_t count)
509 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
510 struct netdev_rx_queue *queue = to_rx_queue(kobj);
512 if (!attribute->store)
515 return attribute->store(queue, attribute, buf, count);
518 static const struct sysfs_ops rx_queue_sysfs_ops = {
519 .show = rx_queue_attr_show,
520 .store = rx_queue_attr_store,
523 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
524 struct rx_queue_attribute *attribute, char *buf)
531 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
535 map = rcu_dereference(queue->rps_map);
537 for (i = 0; i < map->len; i++)
538 cpumask_set_cpu(map->cpus[i], mask);
540 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
541 if (PAGE_SIZE - len < 3) {
543 free_cpumask_var(mask);
548 free_cpumask_var(mask);
549 len += sprintf(buf + len, "\n");
553 static void rps_map_release(struct rcu_head *rcu)
555 struct rps_map *map = container_of(rcu, struct rps_map, rcu);
560 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
561 struct rx_queue_attribute *attribute,
562 const char *buf, size_t len)
564 struct rps_map *old_map, *map;
567 static DEFINE_SPINLOCK(rps_map_lock);
569 if (!capable(CAP_NET_ADMIN))
572 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
575 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
577 free_cpumask_var(mask);
581 map = kzalloc(max_t(unsigned,
582 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
585 free_cpumask_var(mask);
590 for_each_cpu_and(cpu, mask, cpu_online_mask)
591 map->cpus[i++] = cpu;
600 spin_lock(&rps_map_lock);
601 old_map = rcu_dereference_protected(queue->rps_map,
602 lockdep_is_held(&rps_map_lock));
603 rcu_assign_pointer(queue->rps_map, map);
604 spin_unlock(&rps_map_lock);
607 call_rcu(&old_map->rcu, rps_map_release);
609 free_cpumask_var(mask);
613 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
614 struct rx_queue_attribute *attr,
617 struct rps_dev_flow_table *flow_table;
618 unsigned int val = 0;
621 flow_table = rcu_dereference(queue->rps_flow_table);
623 val = flow_table->mask + 1;
626 return sprintf(buf, "%u\n", val);
629 static void rps_dev_flow_table_release_work(struct work_struct *work)
631 struct rps_dev_flow_table *table = container_of(work,
632 struct rps_dev_flow_table, free_work);
637 static void rps_dev_flow_table_release(struct rcu_head *rcu)
639 struct rps_dev_flow_table *table = container_of(rcu,
640 struct rps_dev_flow_table, rcu);
642 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
643 schedule_work(&table->free_work);
646 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
647 struct rx_queue_attribute *attr,
648 const char *buf, size_t len)
652 struct rps_dev_flow_table *table, *old_table;
653 static DEFINE_SPINLOCK(rps_dev_flow_lock);
655 if (!capable(CAP_NET_ADMIN))
658 count = simple_strtoul(buf, &endp, 0);
666 /* Enforce a limit to prevent overflow */
669 count = roundup_pow_of_two(count);
670 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
674 table->mask = count - 1;
675 for (i = 0; i < count; i++)
676 table->flows[i].cpu = RPS_NO_CPU;
680 spin_lock(&rps_dev_flow_lock);
681 old_table = rcu_dereference_protected(queue->rps_flow_table,
682 lockdep_is_held(&rps_dev_flow_lock));
683 rcu_assign_pointer(queue->rps_flow_table, table);
684 spin_unlock(&rps_dev_flow_lock);
687 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
692 static struct rx_queue_attribute rps_cpus_attribute =
693 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
696 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
697 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
698 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
700 static struct attribute *rx_queue_default_attrs[] = {
701 &rps_cpus_attribute.attr,
702 &rps_dev_flow_table_cnt_attribute.attr,
706 static void rx_queue_release(struct kobject *kobj)
708 struct netdev_rx_queue *queue = to_rx_queue(kobj);
710 struct rps_dev_flow_table *flow_table;
713 map = rcu_dereference_raw(queue->rps_map);
715 RCU_INIT_POINTER(queue->rps_map, NULL);
716 call_rcu(&map->rcu, rps_map_release);
719 flow_table = rcu_dereference_raw(queue->rps_flow_table);
721 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
722 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
725 memset(kobj, 0, sizeof(*kobj));
729 static struct kobj_type rx_queue_ktype = {
730 .sysfs_ops = &rx_queue_sysfs_ops,
731 .release = rx_queue_release,
732 .default_attrs = rx_queue_default_attrs,
735 static int rx_queue_add_kobject(struct net_device *net, int index)
737 struct netdev_rx_queue *queue = net->_rx + index;
738 struct kobject *kobj = &queue->kobj;
741 kobj->kset = net->queues_kset;
742 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
749 kobject_uevent(kobj, KOBJ_ADD);
750 dev_hold(queue->dev);
754 #endif /* CONFIG_RPS */
757 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
763 for (i = old_num; i < new_num; i++) {
764 error = rx_queue_add_kobject(net, i);
771 while (--i >= new_num)
772 kobject_put(&net->_rx[i].kobj);
782 * netdev_queue sysfs structures and functions.
784 struct netdev_queue_attribute {
785 struct attribute attr;
786 ssize_t (*show)(struct netdev_queue *queue,
787 struct netdev_queue_attribute *attr, char *buf);
788 ssize_t (*store)(struct netdev_queue *queue,
789 struct netdev_queue_attribute *attr, const char *buf, size_t len);
791 #define to_netdev_queue_attr(_attr) container_of(_attr, \
792 struct netdev_queue_attribute, attr)
794 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
796 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
797 struct attribute *attr, char *buf)
799 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
800 struct netdev_queue *queue = to_netdev_queue(kobj);
802 if (!attribute->show)
805 return attribute->show(queue, attribute, buf);
808 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
809 struct attribute *attr,
810 const char *buf, size_t count)
812 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
813 struct netdev_queue *queue = to_netdev_queue(kobj);
815 if (!attribute->store)
818 return attribute->store(queue, attribute, buf, count);
821 static const struct sysfs_ops netdev_queue_sysfs_ops = {
822 .show = netdev_queue_attr_show,
823 .store = netdev_queue_attr_store,
826 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
828 struct net_device *dev = queue->dev;
831 for (i = 0; i < dev->num_tx_queues; i++)
832 if (queue == &dev->_tx[i])
835 BUG_ON(i >= dev->num_tx_queues);
841 static ssize_t show_xps_map(struct netdev_queue *queue,
842 struct netdev_queue_attribute *attribute, char *buf)
844 struct net_device *dev = queue->dev;
845 struct xps_dev_maps *dev_maps;
851 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
854 index = get_netdev_queue_index(queue);
857 dev_maps = rcu_dereference(dev->xps_maps);
859 for_each_possible_cpu(i) {
860 struct xps_map *map =
861 rcu_dereference(dev_maps->cpu_map[i]);
864 for (j = 0; j < map->len; j++) {
865 if (map->queues[j] == index) {
866 cpumask_set_cpu(i, mask);
875 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
876 if (PAGE_SIZE - len < 3) {
877 free_cpumask_var(mask);
881 free_cpumask_var(mask);
882 len += sprintf(buf + len, "\n");
886 static void xps_map_release(struct rcu_head *rcu)
888 struct xps_map *map = container_of(rcu, struct xps_map, rcu);
893 static void xps_dev_maps_release(struct rcu_head *rcu)
895 struct xps_dev_maps *dev_maps =
896 container_of(rcu, struct xps_dev_maps, rcu);
901 static DEFINE_MUTEX(xps_map_mutex);
902 #define xmap_dereference(P) \
903 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
905 static ssize_t store_xps_map(struct netdev_queue *queue,
906 struct netdev_queue_attribute *attribute,
907 const char *buf, size_t len)
909 struct net_device *dev = queue->dev;
911 int err, i, cpu, pos, map_len, alloc_len, need_set;
913 struct xps_map *map, *new_map;
914 struct xps_dev_maps *dev_maps, *new_dev_maps;
918 if (!capable(CAP_NET_ADMIN))
921 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
924 index = get_netdev_queue_index(queue);
926 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
928 free_cpumask_var(mask);
932 new_dev_maps = kzalloc(max_t(unsigned,
933 XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
935 free_cpumask_var(mask);
939 mutex_lock(&xps_map_mutex);
941 dev_maps = xmap_dereference(dev->xps_maps);
943 for_each_possible_cpu(cpu) {
945 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
948 for (pos = 0; pos < map->len; pos++)
949 if (map->queues[pos] == index)
952 alloc_len = map->alloc_len;
954 pos = map_len = alloc_len = 0;
956 need_set = cpu_isset(cpu, *mask) && cpu_online(cpu);
960 numa_node = cpu_to_node(cpu);
961 else if (numa_node != cpu_to_node(cpu))
965 if (need_set && pos >= map_len) {
966 /* Need to add queue to this CPU's map */
967 if (map_len >= alloc_len) {
968 alloc_len = alloc_len ?
969 2 * alloc_len : XPS_MIN_MAP_ALLOC;
970 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
975 new_map->alloc_len = alloc_len;
976 for (i = 0; i < map_len; i++)
977 new_map->queues[i] = map->queues[i];
978 new_map->len = map_len;
980 new_map->queues[new_map->len++] = index;
981 } else if (!need_set && pos < map_len) {
982 /* Need to remove queue from this CPU's map */
984 new_map->queues[pos] =
985 new_map->queues[--new_map->len];
989 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
992 /* Cleanup old maps */
993 for_each_possible_cpu(cpu) {
995 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
996 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
997 call_rcu(&map->rcu, xps_map_release);
998 if (new_dev_maps->cpu_map[cpu])
1003 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
1005 kfree(new_dev_maps);
1006 rcu_assign_pointer(dev->xps_maps, NULL);
1010 call_rcu(&dev_maps->rcu, xps_dev_maps_release);
1012 netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node : -1);
1014 mutex_unlock(&xps_map_mutex);
1016 free_cpumask_var(mask);
1020 mutex_unlock(&xps_map_mutex);
1023 for_each_possible_cpu(i)
1024 kfree(rcu_dereference_protected(
1025 new_dev_maps->cpu_map[i],
1027 kfree(new_dev_maps);
1028 free_cpumask_var(mask);
1032 static struct netdev_queue_attribute xps_cpus_attribute =
1033 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1035 static struct attribute *netdev_queue_default_attrs[] = {
1036 &xps_cpus_attribute.attr,
1040 static void netdev_queue_release(struct kobject *kobj)
1042 struct netdev_queue *queue = to_netdev_queue(kobj);
1043 struct net_device *dev = queue->dev;
1044 struct xps_dev_maps *dev_maps;
1045 struct xps_map *map;
1046 unsigned long index;
1047 int i, pos, nonempty = 0;
1049 index = get_netdev_queue_index(queue);
1051 mutex_lock(&xps_map_mutex);
1052 dev_maps = xmap_dereference(dev->xps_maps);
1055 for_each_possible_cpu(i) {
1056 map = xmap_dereference(dev_maps->cpu_map[i]);
1060 for (pos = 0; pos < map->len; pos++)
1061 if (map->queues[pos] == index)
1064 if (pos < map->len) {
1067 map->queues[--map->len];
1069 RCU_INIT_POINTER(dev_maps->cpu_map[i],
1071 call_rcu(&map->rcu, xps_map_release);
1080 RCU_INIT_POINTER(dev->xps_maps, NULL);
1081 call_rcu(&dev_maps->rcu, xps_dev_maps_release);
1085 mutex_unlock(&xps_map_mutex);
1087 memset(kobj, 0, sizeof(*kobj));
1088 dev_put(queue->dev);
1091 static struct kobj_type netdev_queue_ktype = {
1092 .sysfs_ops = &netdev_queue_sysfs_ops,
1093 .release = netdev_queue_release,
1094 .default_attrs = netdev_queue_default_attrs,
1097 static int netdev_queue_add_kobject(struct net_device *net, int index)
1099 struct netdev_queue *queue = net->_tx + index;
1100 struct kobject *kobj = &queue->kobj;
1103 kobj->kset = net->queues_kset;
1104 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1111 kobject_uevent(kobj, KOBJ_ADD);
1112 dev_hold(queue->dev);
1116 #endif /* CONFIG_XPS */
1119 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1125 for (i = old_num; i < new_num; i++) {
1126 error = netdev_queue_add_kobject(net, i);
1133 while (--i >= new_num)
1134 kobject_put(&net->_tx[i].kobj);
1142 static int register_queue_kobjects(struct net_device *net)
1144 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1146 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1147 net->queues_kset = kset_create_and_add("queues",
1148 NULL, &net->dev.kobj);
1149 if (!net->queues_kset)
1154 real_rx = net->real_num_rx_queues;
1156 real_tx = net->real_num_tx_queues;
1158 error = net_rx_queue_update_kobjects(net, 0, real_rx);
1163 error = netdev_queue_update_kobjects(net, 0, real_tx);
1171 netdev_queue_update_kobjects(net, txq, 0);
1172 net_rx_queue_update_kobjects(net, rxq, 0);
1176 static void remove_queue_kobjects(struct net_device *net)
1178 int real_rx = 0, real_tx = 0;
1181 real_rx = net->real_num_rx_queues;
1183 real_tx = net->real_num_tx_queues;
1185 net_rx_queue_update_kobjects(net, real_rx, 0);
1186 netdev_queue_update_kobjects(net, real_tx, 0);
1187 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1188 kset_unregister(net->queues_kset);
1192 static const void *net_current_ns(void)
1194 return current->nsproxy->net_ns;
1197 static const void *net_initial_ns(void)
1202 static const void *net_netlink_ns(struct sock *sk)
1204 return sock_net(sk);
1207 struct kobj_ns_type_operations net_ns_type_operations = {
1208 .type = KOBJ_NS_TYPE_NET,
1209 .current_ns = net_current_ns,
1210 .netlink_ns = net_netlink_ns,
1211 .initial_ns = net_initial_ns,
1213 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1215 static void net_kobj_ns_exit(struct net *net)
1217 kobj_ns_exit(KOBJ_NS_TYPE_NET, net);
1220 static struct pernet_operations kobj_net_ops = {
1221 .exit = net_kobj_ns_exit,
1225 #ifdef CONFIG_HOTPLUG
1226 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1228 struct net_device *dev = to_net_dev(d);
1231 /* pass interface to uevent. */
1232 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1236 /* pass ifindex to uevent.
1237 * ifindex is useful as it won't change (interface name may change)
1238 * and is what RtNetlink uses natively. */
1239 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1247 * netdev_release -- destroy and free a dead device.
1248 * Called when last reference to device kobject is gone.
1250 static void netdev_release(struct device *d)
1252 struct net_device *dev = to_net_dev(d);
1254 BUG_ON(dev->reg_state != NETREG_RELEASED);
1256 kfree(dev->ifalias);
1257 kfree((char *)dev - dev->padded);
1260 static const void *net_namespace(struct device *d)
1262 struct net_device *dev;
1263 dev = container_of(d, struct net_device, dev);
1264 return dev_net(dev);
1267 static struct class net_class = {
1269 .dev_release = netdev_release,
1271 .dev_attrs = net_class_attributes,
1272 #endif /* CONFIG_SYSFS */
1273 #ifdef CONFIG_HOTPLUG
1274 .dev_uevent = netdev_uevent,
1276 .ns_type = &net_ns_type_operations,
1277 .namespace = net_namespace,
1280 /* Delete sysfs entries but hold kobject reference until after all
1281 * netdev references are gone.
1283 void netdev_unregister_kobject(struct net_device * net)
1285 struct device *dev = &(net->dev);
1287 kobject_get(&dev->kobj);
1289 remove_queue_kobjects(net);
1294 /* Create sysfs entries for network device. */
1295 int netdev_register_kobject(struct net_device *net)
1297 struct device *dev = &(net->dev);
1298 const struct attribute_group **groups = net->sysfs_groups;
1301 device_initialize(dev);
1302 dev->class = &net_class;
1303 dev->platform_data = net;
1304 dev->groups = groups;
1306 dev_set_name(dev, "%s", net->name);
1309 /* Allow for a device specific group */
1313 *groups++ = &netstat_group;
1314 #ifdef CONFIG_WIRELESS_EXT_SYSFS
1315 if (net->ieee80211_ptr)
1316 *groups++ = &wireless_group;
1317 #ifdef CONFIG_WIRELESS_EXT
1318 else if (net->wireless_handlers)
1319 *groups++ = &wireless_group;
1322 #endif /* CONFIG_SYSFS */
1324 error = device_add(dev);
1328 error = register_queue_kobjects(net);
1337 int netdev_class_create_file(struct class_attribute *class_attr)
1339 return class_create_file(&net_class, class_attr);
1341 EXPORT_SYMBOL(netdev_class_create_file);
1343 void netdev_class_remove_file(struct class_attribute *class_attr)
1345 class_remove_file(&net_class, class_attr);
1347 EXPORT_SYMBOL(netdev_class_remove_file);
1349 int netdev_kobject_init(void)
1351 kobj_ns_type_register(&net_ns_type_operations);
1352 register_pernet_subsys(&kobj_net_ops);
1353 return class_register(&net_class);