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>
23 #include <linux/export.h>
26 #include "net-sysfs.h"
29 static const char fmt_hex[] = "%#x\n";
30 static const char fmt_long_hex[] = "%#lx\n";
31 static const char fmt_dec[] = "%d\n";
32 static const char fmt_udec[] = "%u\n";
33 static const char fmt_ulong[] = "%lu\n";
34 static const char fmt_u64[] = "%llu\n";
36 static inline int dev_isalive(const struct net_device *dev)
38 return dev->reg_state <= NETREG_REGISTERED;
41 /* use same locking rules as GIF* ioctl's */
42 static ssize_t netdev_show(const struct device *dev,
43 struct device_attribute *attr, char *buf,
44 ssize_t (*format)(const struct net_device *, char *))
46 struct net_device *net = to_net_dev(dev);
47 ssize_t ret = -EINVAL;
49 read_lock(&dev_base_lock);
51 ret = (*format)(net, buf);
52 read_unlock(&dev_base_lock);
57 /* generate a show function for simple field */
58 #define NETDEVICE_SHOW(field, format_string) \
59 static ssize_t format_##field(const struct net_device *net, char *buf) \
61 return sprintf(buf, format_string, net->field); \
63 static ssize_t show_##field(struct device *dev, \
64 struct device_attribute *attr, char *buf) \
66 return netdev_show(dev, attr, buf, format_##field); \
70 /* use same locking and permission rules as SIF* ioctl's */
71 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
72 const char *buf, size_t len,
73 int (*set)(struct net_device *, unsigned long))
75 struct net_device *net = to_net_dev(dev);
80 if (!capable(CAP_NET_ADMIN))
83 new = simple_strtoul(buf, &endp, 0);
88 return restart_syscall();
90 if (dev_isalive(net)) {
91 if ((ret = (*set)(net, new)) == 0)
99 NETDEVICE_SHOW(dev_id, fmt_hex);
100 NETDEVICE_SHOW(addr_assign_type, fmt_dec);
101 NETDEVICE_SHOW(addr_len, fmt_dec);
102 NETDEVICE_SHOW(iflink, fmt_dec);
103 NETDEVICE_SHOW(ifindex, fmt_dec);
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 (!__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 (!__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(type, S_IRUGO, show_type, NULL),
316 __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
317 __ATTR(address, S_IRUGO, show_address, NULL),
318 __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
319 __ATTR(carrier, S_IRUGO, show_carrier, NULL),
320 __ATTR(speed, S_IRUGO, show_speed, NULL),
321 __ATTR(duplex, S_IRUGO, show_duplex, NULL),
322 __ATTR(dormant, S_IRUGO, show_dormant, NULL),
323 __ATTR(operstate, S_IRUGO, show_operstate, NULL),
324 __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
325 __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
326 __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
328 __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
332 /* Show a given an attribute in the statistics group */
333 static ssize_t netstat_show(const struct device *d,
334 struct device_attribute *attr, char *buf,
335 unsigned long offset)
337 struct net_device *dev = to_net_dev(d);
338 ssize_t ret = -EINVAL;
340 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
341 offset % sizeof(u64) != 0);
343 read_lock(&dev_base_lock);
344 if (dev_isalive(dev)) {
345 struct rtnl_link_stats64 temp;
346 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
348 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
350 read_unlock(&dev_base_lock);
354 /* generate a read-only statistics attribute */
355 #define NETSTAT_ENTRY(name) \
356 static ssize_t show_##name(struct device *d, \
357 struct device_attribute *attr, char *buf) \
359 return netstat_show(d, attr, buf, \
360 offsetof(struct rtnl_link_stats64, name)); \
362 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
364 NETSTAT_ENTRY(rx_packets);
365 NETSTAT_ENTRY(tx_packets);
366 NETSTAT_ENTRY(rx_bytes);
367 NETSTAT_ENTRY(tx_bytes);
368 NETSTAT_ENTRY(rx_errors);
369 NETSTAT_ENTRY(tx_errors);
370 NETSTAT_ENTRY(rx_dropped);
371 NETSTAT_ENTRY(tx_dropped);
372 NETSTAT_ENTRY(multicast);
373 NETSTAT_ENTRY(collisions);
374 NETSTAT_ENTRY(rx_length_errors);
375 NETSTAT_ENTRY(rx_over_errors);
376 NETSTAT_ENTRY(rx_crc_errors);
377 NETSTAT_ENTRY(rx_frame_errors);
378 NETSTAT_ENTRY(rx_fifo_errors);
379 NETSTAT_ENTRY(rx_missed_errors);
380 NETSTAT_ENTRY(tx_aborted_errors);
381 NETSTAT_ENTRY(tx_carrier_errors);
382 NETSTAT_ENTRY(tx_fifo_errors);
383 NETSTAT_ENTRY(tx_heartbeat_errors);
384 NETSTAT_ENTRY(tx_window_errors);
385 NETSTAT_ENTRY(rx_compressed);
386 NETSTAT_ENTRY(tx_compressed);
388 static struct attribute *netstat_attrs[] = {
389 &dev_attr_rx_packets.attr,
390 &dev_attr_tx_packets.attr,
391 &dev_attr_rx_bytes.attr,
392 &dev_attr_tx_bytes.attr,
393 &dev_attr_rx_errors.attr,
394 &dev_attr_tx_errors.attr,
395 &dev_attr_rx_dropped.attr,
396 &dev_attr_tx_dropped.attr,
397 &dev_attr_multicast.attr,
398 &dev_attr_collisions.attr,
399 &dev_attr_rx_length_errors.attr,
400 &dev_attr_rx_over_errors.attr,
401 &dev_attr_rx_crc_errors.attr,
402 &dev_attr_rx_frame_errors.attr,
403 &dev_attr_rx_fifo_errors.attr,
404 &dev_attr_rx_missed_errors.attr,
405 &dev_attr_tx_aborted_errors.attr,
406 &dev_attr_tx_carrier_errors.attr,
407 &dev_attr_tx_fifo_errors.attr,
408 &dev_attr_tx_heartbeat_errors.attr,
409 &dev_attr_tx_window_errors.attr,
410 &dev_attr_rx_compressed.attr,
411 &dev_attr_tx_compressed.attr,
416 static struct attribute_group netstat_group = {
417 .name = "statistics",
418 .attrs = netstat_attrs,
421 #ifdef CONFIG_WIRELESS_EXT_SYSFS
422 /* helper function that does all the locking etc for wireless stats */
423 static ssize_t wireless_show(struct device *d, char *buf,
424 ssize_t (*format)(const struct iw_statistics *,
427 struct net_device *dev = to_net_dev(d);
428 const struct iw_statistics *iw;
429 ssize_t ret = -EINVAL;
432 return restart_syscall();
433 if (dev_isalive(dev)) {
434 iw = get_wireless_stats(dev);
436 ret = (*format)(iw, buf);
443 /* show function template for wireless fields */
444 #define WIRELESS_SHOW(name, field, format_string) \
445 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
447 return sprintf(buf, format_string, iw->field); \
449 static ssize_t show_iw_##name(struct device *d, \
450 struct device_attribute *attr, char *buf) \
452 return wireless_show(d, buf, format_iw_##name); \
454 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
456 WIRELESS_SHOW(status, status, fmt_hex);
457 WIRELESS_SHOW(link, qual.qual, fmt_dec);
458 WIRELESS_SHOW(level, qual.level, fmt_dec);
459 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
460 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
461 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
462 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
463 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
464 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
465 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
467 static struct attribute *wireless_attrs[] = {
468 &dev_attr_status.attr,
470 &dev_attr_level.attr,
471 &dev_attr_noise.attr,
473 &dev_attr_crypt.attr,
474 &dev_attr_fragment.attr,
475 &dev_attr_retries.attr,
477 &dev_attr_beacon.attr,
481 static struct attribute_group wireless_group = {
483 .attrs = wireless_attrs,
486 #endif /* CONFIG_SYSFS */
490 * RX queue sysfs structures and functions.
492 struct rx_queue_attribute {
493 struct attribute attr;
494 ssize_t (*show)(struct netdev_rx_queue *queue,
495 struct rx_queue_attribute *attr, char *buf);
496 ssize_t (*store)(struct netdev_rx_queue *queue,
497 struct rx_queue_attribute *attr, const char *buf, size_t len);
499 #define to_rx_queue_attr(_attr) container_of(_attr, \
500 struct rx_queue_attribute, attr)
502 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
504 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
507 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
508 struct netdev_rx_queue *queue = to_rx_queue(kobj);
510 if (!attribute->show)
513 return attribute->show(queue, attribute, buf);
516 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
517 const char *buf, size_t count)
519 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
520 struct netdev_rx_queue *queue = to_rx_queue(kobj);
522 if (!attribute->store)
525 return attribute->store(queue, attribute, buf, count);
528 static const struct sysfs_ops rx_queue_sysfs_ops = {
529 .show = rx_queue_attr_show,
530 .store = rx_queue_attr_store,
533 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
534 struct rx_queue_attribute *attribute, char *buf)
541 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
545 map = rcu_dereference(queue->rps_map);
547 for (i = 0; i < map->len; i++)
548 cpumask_set_cpu(map->cpus[i], mask);
550 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
551 if (PAGE_SIZE - len < 3) {
553 free_cpumask_var(mask);
558 free_cpumask_var(mask);
559 len += sprintf(buf + len, "\n");
563 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
564 struct rx_queue_attribute *attribute,
565 const char *buf, size_t len)
567 struct rps_map *old_map, *map;
570 static DEFINE_SPINLOCK(rps_map_lock);
572 if (!capable(CAP_NET_ADMIN))
575 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
578 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
580 free_cpumask_var(mask);
584 map = kzalloc(max_t(unsigned,
585 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
588 free_cpumask_var(mask);
593 for_each_cpu_and(cpu, mask, cpu_online_mask)
594 map->cpus[i++] = cpu;
603 spin_lock(&rps_map_lock);
604 old_map = rcu_dereference_protected(queue->rps_map,
605 lockdep_is_held(&rps_map_lock));
606 rcu_assign_pointer(queue->rps_map, map);
607 spin_unlock(&rps_map_lock);
610 kfree_rcu(old_map, rcu);
612 free_cpumask_var(mask);
616 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
617 struct rx_queue_attribute *attr,
620 struct rps_dev_flow_table *flow_table;
621 unsigned int val = 0;
624 flow_table = rcu_dereference(queue->rps_flow_table);
626 val = flow_table->mask + 1;
629 return sprintf(buf, "%u\n", val);
632 static void rps_dev_flow_table_release_work(struct work_struct *work)
634 struct rps_dev_flow_table *table = container_of(work,
635 struct rps_dev_flow_table, free_work);
640 static void rps_dev_flow_table_release(struct rcu_head *rcu)
642 struct rps_dev_flow_table *table = container_of(rcu,
643 struct rps_dev_flow_table, rcu);
645 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
646 schedule_work(&table->free_work);
649 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
650 struct rx_queue_attribute *attr,
651 const char *buf, size_t len)
655 struct rps_dev_flow_table *table, *old_table;
656 static DEFINE_SPINLOCK(rps_dev_flow_lock);
658 if (!capable(CAP_NET_ADMIN))
661 count = simple_strtoul(buf, &endp, 0);
670 count = roundup_pow_of_two(count);
671 if (count > (ULONG_MAX - sizeof(struct rps_dev_flow_table))
672 / sizeof(struct rps_dev_flow)) {
673 /* Enforce a limit to prevent overflow */
676 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
680 table->mask = count - 1;
681 for (i = 0; i < count; i++)
682 table->flows[i].cpu = RPS_NO_CPU;
686 spin_lock(&rps_dev_flow_lock);
687 old_table = rcu_dereference_protected(queue->rps_flow_table,
688 lockdep_is_held(&rps_dev_flow_lock));
689 rcu_assign_pointer(queue->rps_flow_table, table);
690 spin_unlock(&rps_dev_flow_lock);
693 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
698 static struct rx_queue_attribute rps_cpus_attribute =
699 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
702 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
703 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
704 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
706 static struct attribute *rx_queue_default_attrs[] = {
707 &rps_cpus_attribute.attr,
708 &rps_dev_flow_table_cnt_attribute.attr,
712 static void rx_queue_release(struct kobject *kobj)
714 struct netdev_rx_queue *queue = to_rx_queue(kobj);
716 struct rps_dev_flow_table *flow_table;
719 map = rcu_dereference_protected(queue->rps_map, 1);
721 RCU_INIT_POINTER(queue->rps_map, NULL);
725 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
727 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
728 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
731 memset(kobj, 0, sizeof(*kobj));
735 static struct kobj_type rx_queue_ktype = {
736 .sysfs_ops = &rx_queue_sysfs_ops,
737 .release = rx_queue_release,
738 .default_attrs = rx_queue_default_attrs,
741 static int rx_queue_add_kobject(struct net_device *net, int index)
743 struct netdev_rx_queue *queue = net->_rx + index;
744 struct kobject *kobj = &queue->kobj;
747 kobj->kset = net->queues_kset;
748 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
755 kobject_uevent(kobj, KOBJ_ADD);
756 dev_hold(queue->dev);
760 #endif /* CONFIG_RPS */
763 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
769 for (i = old_num; i < new_num; i++) {
770 error = rx_queue_add_kobject(net, i);
777 while (--i >= new_num)
778 kobject_put(&net->_rx[i].kobj);
788 * netdev_queue sysfs structures and functions.
790 struct netdev_queue_attribute {
791 struct attribute attr;
792 ssize_t (*show)(struct netdev_queue *queue,
793 struct netdev_queue_attribute *attr, char *buf);
794 ssize_t (*store)(struct netdev_queue *queue,
795 struct netdev_queue_attribute *attr, const char *buf, size_t len);
797 #define to_netdev_queue_attr(_attr) container_of(_attr, \
798 struct netdev_queue_attribute, attr)
800 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
802 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
803 struct attribute *attr, char *buf)
805 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
806 struct netdev_queue *queue = to_netdev_queue(kobj);
808 if (!attribute->show)
811 return attribute->show(queue, attribute, buf);
814 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
815 struct attribute *attr,
816 const char *buf, size_t count)
818 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
819 struct netdev_queue *queue = to_netdev_queue(kobj);
821 if (!attribute->store)
824 return attribute->store(queue, attribute, buf, count);
827 static const struct sysfs_ops netdev_queue_sysfs_ops = {
828 .show = netdev_queue_attr_show,
829 .store = netdev_queue_attr_store,
832 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
834 struct net_device *dev = queue->dev;
837 for (i = 0; i < dev->num_tx_queues; i++)
838 if (queue == &dev->_tx[i])
841 BUG_ON(i >= dev->num_tx_queues);
847 static ssize_t show_xps_map(struct netdev_queue *queue,
848 struct netdev_queue_attribute *attribute, char *buf)
850 struct net_device *dev = queue->dev;
851 struct xps_dev_maps *dev_maps;
857 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
860 index = get_netdev_queue_index(queue);
863 dev_maps = rcu_dereference(dev->xps_maps);
865 for_each_possible_cpu(i) {
866 struct xps_map *map =
867 rcu_dereference(dev_maps->cpu_map[i]);
870 for (j = 0; j < map->len; j++) {
871 if (map->queues[j] == index) {
872 cpumask_set_cpu(i, mask);
881 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
882 if (PAGE_SIZE - len < 3) {
883 free_cpumask_var(mask);
887 free_cpumask_var(mask);
888 len += sprintf(buf + len, "\n");
892 static DEFINE_MUTEX(xps_map_mutex);
893 #define xmap_dereference(P) \
894 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
896 static ssize_t store_xps_map(struct netdev_queue *queue,
897 struct netdev_queue_attribute *attribute,
898 const char *buf, size_t len)
900 struct net_device *dev = queue->dev;
902 int err, i, cpu, pos, map_len, alloc_len, need_set;
904 struct xps_map *map, *new_map;
905 struct xps_dev_maps *dev_maps, *new_dev_maps;
909 if (!capable(CAP_NET_ADMIN))
912 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
915 index = get_netdev_queue_index(queue);
917 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
919 free_cpumask_var(mask);
923 new_dev_maps = kzalloc(max_t(unsigned,
924 XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
926 free_cpumask_var(mask);
930 mutex_lock(&xps_map_mutex);
932 dev_maps = xmap_dereference(dev->xps_maps);
934 for_each_possible_cpu(cpu) {
936 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
939 for (pos = 0; pos < map->len; pos++)
940 if (map->queues[pos] == index)
943 alloc_len = map->alloc_len;
945 pos = map_len = alloc_len = 0;
947 need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu);
951 numa_node = cpu_to_node(cpu);
952 else if (numa_node != cpu_to_node(cpu))
956 if (need_set && pos >= map_len) {
957 /* Need to add queue to this CPU's map */
958 if (map_len >= alloc_len) {
959 alloc_len = alloc_len ?
960 2 * alloc_len : XPS_MIN_MAP_ALLOC;
961 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
966 new_map->alloc_len = alloc_len;
967 for (i = 0; i < map_len; i++)
968 new_map->queues[i] = map->queues[i];
969 new_map->len = map_len;
971 new_map->queues[new_map->len++] = index;
972 } else if (!need_set && pos < map_len) {
973 /* Need to remove queue from this CPU's map */
975 new_map->queues[pos] =
976 new_map->queues[--new_map->len];
980 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
983 /* Cleanup old maps */
984 for_each_possible_cpu(cpu) {
986 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
987 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
989 if (new_dev_maps->cpu_map[cpu])
994 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
997 RCU_INIT_POINTER(dev->xps_maps, NULL);
1001 kfree_rcu(dev_maps, rcu);
1003 netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node :
1006 mutex_unlock(&xps_map_mutex);
1008 free_cpumask_var(mask);
1012 mutex_unlock(&xps_map_mutex);
1015 for_each_possible_cpu(i)
1016 kfree(rcu_dereference_protected(
1017 new_dev_maps->cpu_map[i],
1019 kfree(new_dev_maps);
1020 free_cpumask_var(mask);
1024 static struct netdev_queue_attribute xps_cpus_attribute =
1025 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1027 static struct attribute *netdev_queue_default_attrs[] = {
1028 &xps_cpus_attribute.attr,
1032 static void netdev_queue_release(struct kobject *kobj)
1034 struct netdev_queue *queue = to_netdev_queue(kobj);
1035 struct net_device *dev = queue->dev;
1036 struct xps_dev_maps *dev_maps;
1037 struct xps_map *map;
1038 unsigned long index;
1039 int i, pos, nonempty = 0;
1041 index = get_netdev_queue_index(queue);
1043 mutex_lock(&xps_map_mutex);
1044 dev_maps = xmap_dereference(dev->xps_maps);
1047 for_each_possible_cpu(i) {
1048 map = xmap_dereference(dev_maps->cpu_map[i]);
1052 for (pos = 0; pos < map->len; pos++)
1053 if (map->queues[pos] == index)
1056 if (pos < map->len) {
1059 map->queues[--map->len];
1061 RCU_INIT_POINTER(dev_maps->cpu_map[i],
1063 kfree_rcu(map, rcu);
1072 RCU_INIT_POINTER(dev->xps_maps, NULL);
1073 kfree_rcu(dev_maps, rcu);
1077 mutex_unlock(&xps_map_mutex);
1079 memset(kobj, 0, sizeof(*kobj));
1080 dev_put(queue->dev);
1083 static struct kobj_type netdev_queue_ktype = {
1084 .sysfs_ops = &netdev_queue_sysfs_ops,
1085 .release = netdev_queue_release,
1086 .default_attrs = netdev_queue_default_attrs,
1089 static int netdev_queue_add_kobject(struct net_device *net, int index)
1091 struct netdev_queue *queue = net->_tx + index;
1092 struct kobject *kobj = &queue->kobj;
1095 kobj->kset = net->queues_kset;
1096 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1103 kobject_uevent(kobj, KOBJ_ADD);
1104 dev_hold(queue->dev);
1108 #endif /* CONFIG_XPS */
1111 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1117 for (i = old_num; i < new_num; i++) {
1118 error = netdev_queue_add_kobject(net, i);
1125 while (--i >= new_num)
1126 kobject_put(&net->_tx[i].kobj);
1134 static int register_queue_kobjects(struct net_device *net)
1136 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1138 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1139 net->queues_kset = kset_create_and_add("queues",
1140 NULL, &net->dev.kobj);
1141 if (!net->queues_kset)
1146 real_rx = net->real_num_rx_queues;
1148 real_tx = net->real_num_tx_queues;
1150 error = net_rx_queue_update_kobjects(net, 0, real_rx);
1155 error = netdev_queue_update_kobjects(net, 0, real_tx);
1163 netdev_queue_update_kobjects(net, txq, 0);
1164 net_rx_queue_update_kobjects(net, rxq, 0);
1168 static void remove_queue_kobjects(struct net_device *net)
1170 int real_rx = 0, real_tx = 0;
1173 real_rx = net->real_num_rx_queues;
1175 real_tx = net->real_num_tx_queues;
1177 net_rx_queue_update_kobjects(net, real_rx, 0);
1178 netdev_queue_update_kobjects(net, real_tx, 0);
1179 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1180 kset_unregister(net->queues_kset);
1184 static void *net_grab_current_ns(void)
1186 struct net *ns = current->nsproxy->net_ns;
1187 #ifdef CONFIG_NET_NS
1189 atomic_inc(&ns->passive);
1194 static const void *net_initial_ns(void)
1199 static const void *net_netlink_ns(struct sock *sk)
1201 return sock_net(sk);
1204 struct kobj_ns_type_operations net_ns_type_operations = {
1205 .type = KOBJ_NS_TYPE_NET,
1206 .grab_current_ns = net_grab_current_ns,
1207 .netlink_ns = net_netlink_ns,
1208 .initial_ns = net_initial_ns,
1209 .drop_ns = net_drop_ns,
1211 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1213 #ifdef CONFIG_HOTPLUG
1214 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1216 struct net_device *dev = to_net_dev(d);
1219 /* pass interface to uevent. */
1220 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1224 /* pass ifindex to uevent.
1225 * ifindex is useful as it won't change (interface name may change)
1226 * and is what RtNetlink uses natively. */
1227 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1235 * netdev_release -- destroy and free a dead device.
1236 * Called when last reference to device kobject is gone.
1238 static void netdev_release(struct device *d)
1240 struct net_device *dev = to_net_dev(d);
1242 BUG_ON(dev->reg_state != NETREG_RELEASED);
1244 kfree(dev->ifalias);
1245 kfree((char *)dev - dev->padded);
1248 static const void *net_namespace(struct device *d)
1250 struct net_device *dev;
1251 dev = container_of(d, struct net_device, dev);
1252 return dev_net(dev);
1255 static struct class net_class = {
1257 .dev_release = netdev_release,
1259 .dev_attrs = net_class_attributes,
1260 #endif /* CONFIG_SYSFS */
1261 #ifdef CONFIG_HOTPLUG
1262 .dev_uevent = netdev_uevent,
1264 .ns_type = &net_ns_type_operations,
1265 .namespace = net_namespace,
1268 /* Delete sysfs entries but hold kobject reference until after all
1269 * netdev references are gone.
1271 void netdev_unregister_kobject(struct net_device * net)
1273 struct device *dev = &(net->dev);
1275 kobject_get(&dev->kobj);
1277 remove_queue_kobjects(net);
1282 /* Create sysfs entries for network device. */
1283 int netdev_register_kobject(struct net_device *net)
1285 struct device *dev = &(net->dev);
1286 const struct attribute_group **groups = net->sysfs_groups;
1289 device_initialize(dev);
1290 dev->class = &net_class;
1291 dev->platform_data = net;
1292 dev->groups = groups;
1294 dev_set_name(dev, "%s", net->name);
1297 /* Allow for a device specific group */
1301 *groups++ = &netstat_group;
1302 #ifdef CONFIG_WIRELESS_EXT_SYSFS
1303 if (net->ieee80211_ptr)
1304 *groups++ = &wireless_group;
1305 #ifdef CONFIG_WIRELESS_EXT
1306 else if (net->wireless_handlers)
1307 *groups++ = &wireless_group;
1310 #endif /* CONFIG_SYSFS */
1312 error = device_add(dev);
1316 error = register_queue_kobjects(net);
1325 int netdev_class_create_file(struct class_attribute *class_attr)
1327 return class_create_file(&net_class, class_attr);
1329 EXPORT_SYMBOL(netdev_class_create_file);
1331 void netdev_class_remove_file(struct class_attribute *class_attr)
1333 class_remove_file(&net_class, class_attr);
1335 EXPORT_SYMBOL(netdev_class_remove_file);
1337 int netdev_kobject_init(void)
1339 kobj_ns_type_register(&net_ns_type_operations);
1340 return class_register(&net_class);