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>
24 #include <linux/jiffies.h>
27 #include "net-sysfs.h"
30 static const char fmt_hex[] = "%#x\n";
31 static const char fmt_long_hex[] = "%#lx\n";
32 static const char fmt_dec[] = "%d\n";
33 static const char fmt_udec[] = "%u\n";
34 static const char fmt_ulong[] = "%lu\n";
35 static const char fmt_u64[] = "%llu\n";
37 static inline int dev_isalive(const struct net_device *dev)
39 return dev->reg_state <= NETREG_REGISTERED;
42 /* use same locking rules as GIF* ioctl's */
43 static ssize_t netdev_show(const struct device *dev,
44 struct device_attribute *attr, char *buf,
45 ssize_t (*format)(const struct net_device *, char *))
47 struct net_device *net = to_net_dev(dev);
48 ssize_t ret = -EINVAL;
50 read_lock(&dev_base_lock);
52 ret = (*format)(net, buf);
53 read_unlock(&dev_base_lock);
58 /* generate a show function for simple field */
59 #define NETDEVICE_SHOW(field, format_string) \
60 static ssize_t format_##field(const struct net_device *net, char *buf) \
62 return sprintf(buf, format_string, net->field); \
64 static ssize_t show_##field(struct device *dev, \
65 struct device_attribute *attr, char *buf) \
67 return netdev_show(dev, attr, buf, format_##field); \
71 /* use same locking and permission rules as SIF* ioctl's */
72 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
73 const char *buf, size_t len,
74 int (*set)(struct net_device *, unsigned long))
76 struct net_device *net = to_net_dev(dev);
80 if (!capable(CAP_NET_ADMIN))
83 ret = kstrtoul(buf, 0, &new);
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)) {
171 switch (cmd.duplex) {
182 ret = sprintf(buf, "%s\n", duplex);
189 static ssize_t show_dormant(struct device *dev,
190 struct device_attribute *attr, char *buf)
192 struct net_device *netdev = to_net_dev(dev);
194 if (netif_running(netdev))
195 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
200 static const char *const operstates[] = {
202 "notpresent", /* currently unused */
205 "testing", /* currently unused */
210 static ssize_t show_operstate(struct device *dev,
211 struct device_attribute *attr, char *buf)
213 const struct net_device *netdev = to_net_dev(dev);
214 unsigned char operstate;
216 read_lock(&dev_base_lock);
217 operstate = netdev->operstate;
218 if (!netif_running(netdev))
219 operstate = IF_OPER_DOWN;
220 read_unlock(&dev_base_lock);
222 if (operstate >= ARRAY_SIZE(operstates))
223 return -EINVAL; /* should not happen */
225 return sprintf(buf, "%s\n", operstates[operstate]);
228 /* read-write attributes */
229 NETDEVICE_SHOW(mtu, fmt_dec);
231 static int change_mtu(struct net_device *net, unsigned long new_mtu)
233 return dev_set_mtu(net, (int) new_mtu);
236 static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
237 const char *buf, size_t len)
239 return netdev_store(dev, attr, buf, len, change_mtu);
242 NETDEVICE_SHOW(flags, fmt_hex);
244 static int change_flags(struct net_device *net, unsigned long new_flags)
246 return dev_change_flags(net, (unsigned int) new_flags);
249 static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
250 const char *buf, size_t len)
252 return netdev_store(dev, attr, buf, len, change_flags);
255 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
257 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
259 net->tx_queue_len = new_len;
263 static ssize_t store_tx_queue_len(struct device *dev,
264 struct device_attribute *attr,
265 const char *buf, size_t len)
267 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
270 static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
271 const char *buf, size_t len)
273 struct net_device *netdev = to_net_dev(dev);
277 if (!capable(CAP_NET_ADMIN))
280 /* ignore trailing newline */
281 if (len > 0 && buf[len - 1] == '\n')
285 return restart_syscall();
286 ret = dev_set_alias(netdev, buf, count);
289 return ret < 0 ? ret : len;
292 static ssize_t show_ifalias(struct device *dev,
293 struct device_attribute *attr, char *buf)
295 const struct net_device *netdev = to_net_dev(dev);
299 return restart_syscall();
301 ret = sprintf(buf, "%s\n", netdev->ifalias);
306 NETDEVICE_SHOW(group, fmt_dec);
308 static int change_group(struct net_device *net, unsigned long new_group)
310 dev_set_group(net, (int) new_group);
314 static ssize_t store_group(struct device *dev, struct device_attribute *attr,
315 const char *buf, size_t len)
317 return netdev_store(dev, attr, buf, len, change_group);
320 static struct device_attribute net_class_attributes[] = {
321 __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
322 __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
323 __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
324 __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
325 __ATTR(iflink, S_IRUGO, show_iflink, NULL),
326 __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
327 __ATTR(type, S_IRUGO, show_type, NULL),
328 __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
329 __ATTR(address, S_IRUGO, show_address, NULL),
330 __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
331 __ATTR(carrier, S_IRUGO, show_carrier, NULL),
332 __ATTR(speed, S_IRUGO, show_speed, NULL),
333 __ATTR(duplex, S_IRUGO, show_duplex, NULL),
334 __ATTR(dormant, S_IRUGO, show_dormant, NULL),
335 __ATTR(operstate, S_IRUGO, show_operstate, NULL),
336 __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
337 __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
338 __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
340 __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
344 /* Show a given an attribute in the statistics group */
345 static ssize_t netstat_show(const struct device *d,
346 struct device_attribute *attr, char *buf,
347 unsigned long offset)
349 struct net_device *dev = to_net_dev(d);
350 ssize_t ret = -EINVAL;
352 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
353 offset % sizeof(u64) != 0);
355 read_lock(&dev_base_lock);
356 if (dev_isalive(dev)) {
357 struct rtnl_link_stats64 temp;
358 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
360 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
362 read_unlock(&dev_base_lock);
366 /* generate a read-only statistics attribute */
367 #define NETSTAT_ENTRY(name) \
368 static ssize_t show_##name(struct device *d, \
369 struct device_attribute *attr, char *buf) \
371 return netstat_show(d, attr, buf, \
372 offsetof(struct rtnl_link_stats64, name)); \
374 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
376 NETSTAT_ENTRY(rx_packets);
377 NETSTAT_ENTRY(tx_packets);
378 NETSTAT_ENTRY(rx_bytes);
379 NETSTAT_ENTRY(tx_bytes);
380 NETSTAT_ENTRY(rx_errors);
381 NETSTAT_ENTRY(tx_errors);
382 NETSTAT_ENTRY(rx_dropped);
383 NETSTAT_ENTRY(tx_dropped);
384 NETSTAT_ENTRY(multicast);
385 NETSTAT_ENTRY(collisions);
386 NETSTAT_ENTRY(rx_length_errors);
387 NETSTAT_ENTRY(rx_over_errors);
388 NETSTAT_ENTRY(rx_crc_errors);
389 NETSTAT_ENTRY(rx_frame_errors);
390 NETSTAT_ENTRY(rx_fifo_errors);
391 NETSTAT_ENTRY(rx_missed_errors);
392 NETSTAT_ENTRY(tx_aborted_errors);
393 NETSTAT_ENTRY(tx_carrier_errors);
394 NETSTAT_ENTRY(tx_fifo_errors);
395 NETSTAT_ENTRY(tx_heartbeat_errors);
396 NETSTAT_ENTRY(tx_window_errors);
397 NETSTAT_ENTRY(rx_compressed);
398 NETSTAT_ENTRY(tx_compressed);
400 static struct attribute *netstat_attrs[] = {
401 &dev_attr_rx_packets.attr,
402 &dev_attr_tx_packets.attr,
403 &dev_attr_rx_bytes.attr,
404 &dev_attr_tx_bytes.attr,
405 &dev_attr_rx_errors.attr,
406 &dev_attr_tx_errors.attr,
407 &dev_attr_rx_dropped.attr,
408 &dev_attr_tx_dropped.attr,
409 &dev_attr_multicast.attr,
410 &dev_attr_collisions.attr,
411 &dev_attr_rx_length_errors.attr,
412 &dev_attr_rx_over_errors.attr,
413 &dev_attr_rx_crc_errors.attr,
414 &dev_attr_rx_frame_errors.attr,
415 &dev_attr_rx_fifo_errors.attr,
416 &dev_attr_rx_missed_errors.attr,
417 &dev_attr_tx_aborted_errors.attr,
418 &dev_attr_tx_carrier_errors.attr,
419 &dev_attr_tx_fifo_errors.attr,
420 &dev_attr_tx_heartbeat_errors.attr,
421 &dev_attr_tx_window_errors.attr,
422 &dev_attr_rx_compressed.attr,
423 &dev_attr_tx_compressed.attr,
428 static struct attribute_group netstat_group = {
429 .name = "statistics",
430 .attrs = netstat_attrs,
432 #endif /* CONFIG_SYSFS */
436 * RX queue sysfs structures and functions.
438 struct rx_queue_attribute {
439 struct attribute attr;
440 ssize_t (*show)(struct netdev_rx_queue *queue,
441 struct rx_queue_attribute *attr, char *buf);
442 ssize_t (*store)(struct netdev_rx_queue *queue,
443 struct rx_queue_attribute *attr, const char *buf, size_t len);
445 #define to_rx_queue_attr(_attr) container_of(_attr, \
446 struct rx_queue_attribute, attr)
448 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
450 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
453 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
454 struct netdev_rx_queue *queue = to_rx_queue(kobj);
456 if (!attribute->show)
459 return attribute->show(queue, attribute, buf);
462 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
463 const char *buf, size_t count)
465 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
466 struct netdev_rx_queue *queue = to_rx_queue(kobj);
468 if (!attribute->store)
471 return attribute->store(queue, attribute, buf, count);
474 static const struct sysfs_ops rx_queue_sysfs_ops = {
475 .show = rx_queue_attr_show,
476 .store = rx_queue_attr_store,
479 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
480 struct rx_queue_attribute *attribute, char *buf)
487 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
491 map = rcu_dereference(queue->rps_map);
493 for (i = 0; i < map->len; i++)
494 cpumask_set_cpu(map->cpus[i], mask);
496 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
497 if (PAGE_SIZE - len < 3) {
499 free_cpumask_var(mask);
504 free_cpumask_var(mask);
505 len += sprintf(buf + len, "\n");
509 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
510 struct rx_queue_attribute *attribute,
511 const char *buf, size_t len)
513 struct rps_map *old_map, *map;
516 static DEFINE_SPINLOCK(rps_map_lock);
518 if (!capable(CAP_NET_ADMIN))
521 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
524 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
526 free_cpumask_var(mask);
530 map = kzalloc(max_t(unsigned int,
531 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
534 free_cpumask_var(mask);
539 for_each_cpu_and(cpu, mask, cpu_online_mask)
540 map->cpus[i++] = cpu;
549 spin_lock(&rps_map_lock);
550 old_map = rcu_dereference_protected(queue->rps_map,
551 lockdep_is_held(&rps_map_lock));
552 rcu_assign_pointer(queue->rps_map, map);
553 spin_unlock(&rps_map_lock);
556 static_key_slow_inc(&rps_needed);
558 kfree_rcu(old_map, rcu);
559 static_key_slow_dec(&rps_needed);
561 free_cpumask_var(mask);
565 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
566 struct rx_queue_attribute *attr,
569 struct rps_dev_flow_table *flow_table;
570 unsigned long val = 0;
573 flow_table = rcu_dereference(queue->rps_flow_table);
575 val = (unsigned long)flow_table->mask + 1;
578 return sprintf(buf, "%lu\n", val);
581 static void rps_dev_flow_table_release_work(struct work_struct *work)
583 struct rps_dev_flow_table *table = container_of(work,
584 struct rps_dev_flow_table, free_work);
589 static void rps_dev_flow_table_release(struct rcu_head *rcu)
591 struct rps_dev_flow_table *table = container_of(rcu,
592 struct rps_dev_flow_table, rcu);
594 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
595 schedule_work(&table->free_work);
598 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
599 struct rx_queue_attribute *attr,
600 const char *buf, size_t len)
602 unsigned long mask, count;
603 struct rps_dev_flow_table *table, *old_table;
604 static DEFINE_SPINLOCK(rps_dev_flow_lock);
607 if (!capable(CAP_NET_ADMIN))
610 rc = kstrtoul(buf, 0, &count);
616 /* mask = roundup_pow_of_two(count) - 1;
617 * without overflows...
619 while ((mask | (mask >> 1)) != mask)
621 /* On 64 bit arches, must check mask fits in table->mask (u32),
622 * and on 32bit arches, must check RPS_DEV_FLOW_TABLE_SIZE(mask + 1)
625 #if BITS_PER_LONG > 32
626 if (mask > (unsigned long)(u32)mask)
629 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
630 / sizeof(struct rps_dev_flow)) {
631 /* Enforce a limit to prevent overflow */
635 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
640 for (count = 0; count <= mask; count++)
641 table->flows[count].cpu = RPS_NO_CPU;
645 spin_lock(&rps_dev_flow_lock);
646 old_table = rcu_dereference_protected(queue->rps_flow_table,
647 lockdep_is_held(&rps_dev_flow_lock));
648 rcu_assign_pointer(queue->rps_flow_table, table);
649 spin_unlock(&rps_dev_flow_lock);
652 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
657 static struct rx_queue_attribute rps_cpus_attribute =
658 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
661 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
662 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
663 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
665 static struct attribute *rx_queue_default_attrs[] = {
666 &rps_cpus_attribute.attr,
667 &rps_dev_flow_table_cnt_attribute.attr,
671 static void rx_queue_release(struct kobject *kobj)
673 struct netdev_rx_queue *queue = to_rx_queue(kobj);
675 struct rps_dev_flow_table *flow_table;
678 map = rcu_dereference_protected(queue->rps_map, 1);
680 RCU_INIT_POINTER(queue->rps_map, NULL);
684 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
686 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
687 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
690 memset(kobj, 0, sizeof(*kobj));
694 static struct kobj_type rx_queue_ktype = {
695 .sysfs_ops = &rx_queue_sysfs_ops,
696 .release = rx_queue_release,
697 .default_attrs = rx_queue_default_attrs,
700 static int rx_queue_add_kobject(struct net_device *net, int index)
702 struct netdev_rx_queue *queue = net->_rx + index;
703 struct kobject *kobj = &queue->kobj;
706 kobj->kset = net->queues_kset;
707 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
714 kobject_uevent(kobj, KOBJ_ADD);
715 dev_hold(queue->dev);
719 #endif /* CONFIG_RPS */
722 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
728 for (i = old_num; i < new_num; i++) {
729 error = rx_queue_add_kobject(net, i);
736 while (--i >= new_num)
737 kobject_put(&net->_rx[i].kobj);
747 * netdev_queue sysfs structures and functions.
749 struct netdev_queue_attribute {
750 struct attribute attr;
751 ssize_t (*show)(struct netdev_queue *queue,
752 struct netdev_queue_attribute *attr, char *buf);
753 ssize_t (*store)(struct netdev_queue *queue,
754 struct netdev_queue_attribute *attr, const char *buf, size_t len);
756 #define to_netdev_queue_attr(_attr) container_of(_attr, \
757 struct netdev_queue_attribute, attr)
759 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
761 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
762 struct attribute *attr, char *buf)
764 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
765 struct netdev_queue *queue = to_netdev_queue(kobj);
767 if (!attribute->show)
770 return attribute->show(queue, attribute, buf);
773 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
774 struct attribute *attr,
775 const char *buf, size_t count)
777 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
778 struct netdev_queue *queue = to_netdev_queue(kobj);
780 if (!attribute->store)
783 return attribute->store(queue, attribute, buf, count);
786 static const struct sysfs_ops netdev_queue_sysfs_ops = {
787 .show = netdev_queue_attr_show,
788 .store = netdev_queue_attr_store,
791 static ssize_t show_trans_timeout(struct netdev_queue *queue,
792 struct netdev_queue_attribute *attribute,
795 unsigned long trans_timeout;
797 spin_lock_irq(&queue->_xmit_lock);
798 trans_timeout = queue->trans_timeout;
799 spin_unlock_irq(&queue->_xmit_lock);
801 return sprintf(buf, "%lu", trans_timeout);
804 static struct netdev_queue_attribute queue_trans_timeout =
805 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
809 * Byte queue limits sysfs structures and functions.
811 static ssize_t bql_show(char *buf, unsigned int value)
813 return sprintf(buf, "%u\n", value);
816 static ssize_t bql_set(const char *buf, const size_t count,
817 unsigned int *pvalue)
822 if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
823 value = DQL_MAX_LIMIT;
825 err = kstrtouint(buf, 10, &value);
828 if (value > DQL_MAX_LIMIT)
837 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
838 struct netdev_queue_attribute *attr,
841 struct dql *dql = &queue->dql;
843 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
846 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
847 struct netdev_queue_attribute *attribute,
848 const char *buf, size_t len)
850 struct dql *dql = &queue->dql;
854 err = kstrtouint(buf, 10, &value);
858 dql->slack_hold_time = msecs_to_jiffies(value);
863 static struct netdev_queue_attribute bql_hold_time_attribute =
864 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
867 static ssize_t bql_show_inflight(struct netdev_queue *queue,
868 struct netdev_queue_attribute *attr,
871 struct dql *dql = &queue->dql;
873 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
876 static struct netdev_queue_attribute bql_inflight_attribute =
877 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
879 #define BQL_ATTR(NAME, FIELD) \
880 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
881 struct netdev_queue_attribute *attr, \
884 return bql_show(buf, queue->dql.FIELD); \
887 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
888 struct netdev_queue_attribute *attr, \
889 const char *buf, size_t len) \
891 return bql_set(buf, len, &queue->dql.FIELD); \
894 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \
895 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \
898 BQL_ATTR(limit, limit)
899 BQL_ATTR(limit_max, max_limit)
900 BQL_ATTR(limit_min, min_limit)
902 static struct attribute *dql_attrs[] = {
903 &bql_limit_attribute.attr,
904 &bql_limit_max_attribute.attr,
905 &bql_limit_min_attribute.attr,
906 &bql_hold_time_attribute.attr,
907 &bql_inflight_attribute.attr,
911 static struct attribute_group dql_group = {
912 .name = "byte_queue_limits",
915 #endif /* CONFIG_BQL */
918 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
920 struct net_device *dev = queue->dev;
923 for (i = 0; i < dev->num_tx_queues; i++)
924 if (queue == &dev->_tx[i])
927 BUG_ON(i >= dev->num_tx_queues);
933 static ssize_t show_xps_map(struct netdev_queue *queue,
934 struct netdev_queue_attribute *attribute, char *buf)
936 struct net_device *dev = queue->dev;
937 struct xps_dev_maps *dev_maps;
943 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
946 index = get_netdev_queue_index(queue);
949 dev_maps = rcu_dereference(dev->xps_maps);
951 for_each_possible_cpu(i) {
952 struct xps_map *map =
953 rcu_dereference(dev_maps->cpu_map[i]);
956 for (j = 0; j < map->len; j++) {
957 if (map->queues[j] == index) {
958 cpumask_set_cpu(i, mask);
967 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
968 if (PAGE_SIZE - len < 3) {
969 free_cpumask_var(mask);
973 free_cpumask_var(mask);
974 len += sprintf(buf + len, "\n");
978 static DEFINE_MUTEX(xps_map_mutex);
979 #define xmap_dereference(P) \
980 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
982 static void xps_queue_release(struct netdev_queue *queue)
984 struct net_device *dev = queue->dev;
985 struct xps_dev_maps *dev_maps;
988 int i, pos, nonempty = 0;
990 index = get_netdev_queue_index(queue);
992 mutex_lock(&xps_map_mutex);
993 dev_maps = xmap_dereference(dev->xps_maps);
996 for_each_possible_cpu(i) {
997 map = xmap_dereference(dev_maps->cpu_map[i]);
1001 for (pos = 0; pos < map->len; pos++)
1002 if (map->queues[pos] == index)
1005 if (pos < map->len) {
1008 map->queues[--map->len];
1010 RCU_INIT_POINTER(dev_maps->cpu_map[i],
1012 kfree_rcu(map, rcu);
1021 RCU_INIT_POINTER(dev->xps_maps, NULL);
1022 kfree_rcu(dev_maps, rcu);
1025 mutex_unlock(&xps_map_mutex);
1028 static ssize_t store_xps_map(struct netdev_queue *queue,
1029 struct netdev_queue_attribute *attribute,
1030 const char *buf, size_t len)
1032 struct net_device *dev = queue->dev;
1034 int err, i, cpu, pos, map_len, alloc_len, need_set;
1035 unsigned long index;
1036 struct xps_map *map, *new_map;
1037 struct xps_dev_maps *dev_maps, *new_dev_maps;
1039 int numa_node_id = -2;
1041 if (!capable(CAP_NET_ADMIN))
1044 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1047 index = get_netdev_queue_index(queue);
1049 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1051 free_cpumask_var(mask);
1055 new_dev_maps = kzalloc(max_t(unsigned int,
1056 XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
1057 if (!new_dev_maps) {
1058 free_cpumask_var(mask);
1062 mutex_lock(&xps_map_mutex);
1064 dev_maps = xmap_dereference(dev->xps_maps);
1066 for_each_possible_cpu(cpu) {
1068 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
1071 for (pos = 0; pos < map->len; pos++)
1072 if (map->queues[pos] == index)
1075 alloc_len = map->alloc_len;
1077 pos = map_len = alloc_len = 0;
1079 need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu);
1082 if (numa_node_id == -2)
1083 numa_node_id = cpu_to_node(cpu);
1084 else if (numa_node_id != cpu_to_node(cpu))
1088 if (need_set && pos >= map_len) {
1089 /* Need to add queue to this CPU's map */
1090 if (map_len >= alloc_len) {
1091 alloc_len = alloc_len ?
1092 2 * alloc_len : XPS_MIN_MAP_ALLOC;
1093 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
1098 new_map->alloc_len = alloc_len;
1099 for (i = 0; i < map_len; i++)
1100 new_map->queues[i] = map->queues[i];
1101 new_map->len = map_len;
1103 new_map->queues[new_map->len++] = index;
1104 } else if (!need_set && pos < map_len) {
1105 /* Need to remove queue from this CPU's map */
1107 new_map->queues[pos] =
1108 new_map->queues[--new_map->len];
1112 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
1115 /* Cleanup old maps */
1116 for_each_possible_cpu(cpu) {
1118 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
1119 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
1120 kfree_rcu(map, rcu);
1121 if (new_dev_maps->cpu_map[cpu])
1126 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
1128 kfree(new_dev_maps);
1129 RCU_INIT_POINTER(dev->xps_maps, NULL);
1133 kfree_rcu(dev_maps, rcu);
1135 netdev_queue_numa_node_write(queue, (numa_node_id >= 0) ? numa_node_id :
1138 mutex_unlock(&xps_map_mutex);
1140 free_cpumask_var(mask);
1144 mutex_unlock(&xps_map_mutex);
1147 for_each_possible_cpu(i)
1148 kfree(rcu_dereference_protected(
1149 new_dev_maps->cpu_map[i],
1151 kfree(new_dev_maps);
1152 free_cpumask_var(mask);
1156 static struct netdev_queue_attribute xps_cpus_attribute =
1157 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1158 #endif /* CONFIG_XPS */
1160 static struct attribute *netdev_queue_default_attrs[] = {
1161 &queue_trans_timeout.attr,
1163 &xps_cpus_attribute.attr,
1168 static void netdev_queue_release(struct kobject *kobj)
1170 struct netdev_queue *queue = to_netdev_queue(kobj);
1173 xps_queue_release(queue);
1176 memset(kobj, 0, sizeof(*kobj));
1177 dev_put(queue->dev);
1180 static struct kobj_type netdev_queue_ktype = {
1181 .sysfs_ops = &netdev_queue_sysfs_ops,
1182 .release = netdev_queue_release,
1183 .default_attrs = netdev_queue_default_attrs,
1186 static int netdev_queue_add_kobject(struct net_device *net, int index)
1188 struct netdev_queue *queue = net->_tx + index;
1189 struct kobject *kobj = &queue->kobj;
1192 kobj->kset = net->queues_kset;
1193 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1199 error = sysfs_create_group(kobj, &dql_group);
1204 kobject_uevent(kobj, KOBJ_ADD);
1205 dev_hold(queue->dev);
1212 #endif /* CONFIG_SYSFS */
1215 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1221 for (i = old_num; i < new_num; i++) {
1222 error = netdev_queue_add_kobject(net, i);
1229 while (--i >= new_num) {
1230 struct netdev_queue *queue = net->_tx + i;
1233 sysfs_remove_group(&queue->kobj, &dql_group);
1235 kobject_put(&queue->kobj);
1241 #endif /* CONFIG_SYSFS */
1244 static int register_queue_kobjects(struct net_device *net)
1246 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1249 net->queues_kset = kset_create_and_add("queues",
1250 NULL, &net->dev.kobj);
1251 if (!net->queues_kset)
1256 real_rx = net->real_num_rx_queues;
1258 real_tx = net->real_num_tx_queues;
1260 error = net_rx_queue_update_kobjects(net, 0, real_rx);
1265 error = netdev_queue_update_kobjects(net, 0, real_tx);
1273 netdev_queue_update_kobjects(net, txq, 0);
1274 net_rx_queue_update_kobjects(net, rxq, 0);
1278 static void remove_queue_kobjects(struct net_device *net)
1280 int real_rx = 0, real_tx = 0;
1283 real_rx = net->real_num_rx_queues;
1285 real_tx = net->real_num_tx_queues;
1287 net_rx_queue_update_kobjects(net, real_rx, 0);
1288 netdev_queue_update_kobjects(net, real_tx, 0);
1290 kset_unregister(net->queues_kset);
1294 static void *net_grab_current_ns(void)
1296 struct net *ns = current->nsproxy->net_ns;
1297 #ifdef CONFIG_NET_NS
1299 atomic_inc(&ns->passive);
1304 static const void *net_initial_ns(void)
1309 static const void *net_netlink_ns(struct sock *sk)
1311 return sock_net(sk);
1314 struct kobj_ns_type_operations net_ns_type_operations = {
1315 .type = KOBJ_NS_TYPE_NET,
1316 .grab_current_ns = net_grab_current_ns,
1317 .netlink_ns = net_netlink_ns,
1318 .initial_ns = net_initial_ns,
1319 .drop_ns = net_drop_ns,
1321 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1323 #ifdef CONFIG_HOTPLUG
1324 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1326 struct net_device *dev = to_net_dev(d);
1329 /* pass interface to uevent. */
1330 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1334 /* pass ifindex to uevent.
1335 * ifindex is useful as it won't change (interface name may change)
1336 * and is what RtNetlink uses natively. */
1337 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1345 * netdev_release -- destroy and free a dead device.
1346 * Called when last reference to device kobject is gone.
1348 static void netdev_release(struct device *d)
1350 struct net_device *dev = to_net_dev(d);
1352 BUG_ON(dev->reg_state != NETREG_RELEASED);
1354 kfree(dev->ifalias);
1355 kfree((char *)dev - dev->padded);
1358 static const void *net_namespace(struct device *d)
1360 struct net_device *dev;
1361 dev = container_of(d, struct net_device, dev);
1362 return dev_net(dev);
1365 static struct class net_class = {
1367 .dev_release = netdev_release,
1369 .dev_attrs = net_class_attributes,
1370 #endif /* CONFIG_SYSFS */
1371 #ifdef CONFIG_HOTPLUG
1372 .dev_uevent = netdev_uevent,
1374 .ns_type = &net_ns_type_operations,
1375 .namespace = net_namespace,
1378 /* Delete sysfs entries but hold kobject reference until after all
1379 * netdev references are gone.
1381 void netdev_unregister_kobject(struct net_device * net)
1383 struct device *dev = &(net->dev);
1385 kobject_get(&dev->kobj);
1387 remove_queue_kobjects(net);
1392 /* Create sysfs entries for network device. */
1393 int netdev_register_kobject(struct net_device *net)
1395 struct device *dev = &(net->dev);
1396 const struct attribute_group **groups = net->sysfs_groups;
1399 device_initialize(dev);
1400 dev->class = &net_class;
1401 dev->platform_data = net;
1402 dev->groups = groups;
1404 dev_set_name(dev, "%s", net->name);
1407 /* Allow for a device specific group */
1411 *groups++ = &netstat_group;
1412 #endif /* CONFIG_SYSFS */
1414 error = device_add(dev);
1418 error = register_queue_kobjects(net);
1427 int netdev_class_create_file(struct class_attribute *class_attr)
1429 return class_create_file(&net_class, class_attr);
1431 EXPORT_SYMBOL(netdev_class_create_file);
1433 void netdev_class_remove_file(struct class_attribute *class_attr)
1435 class_remove_file(&net_class, class_attr);
1437 EXPORT_SYMBOL(netdev_class_remove_file);
1439 int netdev_kobject_init(void)
1441 kobj_ns_type_register(&net_ns_type_operations);
1442 return class_register(&net_class);