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
,
433 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
434 static struct attribute
*wireless_attrs
[] = {
438 static struct attribute_group wireless_group
= {
440 .attrs
= wireless_attrs
,
443 #endif /* CONFIG_SYSFS */
447 * RX queue sysfs structures and functions.
449 struct rx_queue_attribute
{
450 struct attribute attr
;
451 ssize_t (*show
)(struct netdev_rx_queue
*queue
,
452 struct rx_queue_attribute
*attr
, char *buf
);
453 ssize_t (*store
)(struct netdev_rx_queue
*queue
,
454 struct rx_queue_attribute
*attr
, const char *buf
, size_t len
);
456 #define to_rx_queue_attr(_attr) container_of(_attr, \
457 struct rx_queue_attribute, attr)
459 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
461 static ssize_t
rx_queue_attr_show(struct kobject
*kobj
, struct attribute
*attr
,
464 struct rx_queue_attribute
*attribute
= to_rx_queue_attr(attr
);
465 struct netdev_rx_queue
*queue
= to_rx_queue(kobj
);
467 if (!attribute
->show
)
470 return attribute
->show(queue
, attribute
, buf
);
473 static ssize_t
rx_queue_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
474 const char *buf
, size_t count
)
476 struct rx_queue_attribute
*attribute
= to_rx_queue_attr(attr
);
477 struct netdev_rx_queue
*queue
= to_rx_queue(kobj
);
479 if (!attribute
->store
)
482 return attribute
->store(queue
, attribute
, buf
, count
);
485 static const struct sysfs_ops rx_queue_sysfs_ops
= {
486 .show
= rx_queue_attr_show
,
487 .store
= rx_queue_attr_store
,
490 static ssize_t
show_rps_map(struct netdev_rx_queue
*queue
,
491 struct rx_queue_attribute
*attribute
, char *buf
)
498 if (!zalloc_cpumask_var(&mask
, GFP_KERNEL
))
502 map
= rcu_dereference(queue
->rps_map
);
504 for (i
= 0; i
< map
->len
; i
++)
505 cpumask_set_cpu(map
->cpus
[i
], mask
);
507 len
+= cpumask_scnprintf(buf
+ len
, PAGE_SIZE
, mask
);
508 if (PAGE_SIZE
- len
< 3) {
510 free_cpumask_var(mask
);
515 free_cpumask_var(mask
);
516 len
+= sprintf(buf
+ len
, "\n");
520 static ssize_t
store_rps_map(struct netdev_rx_queue
*queue
,
521 struct rx_queue_attribute
*attribute
,
522 const char *buf
, size_t len
)
524 struct rps_map
*old_map
, *map
;
527 static DEFINE_SPINLOCK(rps_map_lock
);
529 if (!capable(CAP_NET_ADMIN
))
532 if (!alloc_cpumask_var(&mask
, GFP_KERNEL
))
535 err
= bitmap_parse(buf
, len
, cpumask_bits(mask
), nr_cpumask_bits
);
537 free_cpumask_var(mask
);
541 map
= kzalloc(max_t(unsigned int,
542 RPS_MAP_SIZE(cpumask_weight(mask
)), L1_CACHE_BYTES
),
545 free_cpumask_var(mask
);
550 for_each_cpu_and(cpu
, mask
, cpu_online_mask
)
551 map
->cpus
[i
++] = cpu
;
560 spin_lock(&rps_map_lock
);
561 old_map
= rcu_dereference_protected(queue
->rps_map
,
562 lockdep_is_held(&rps_map_lock
));
563 rcu_assign_pointer(queue
->rps_map
, map
);
564 spin_unlock(&rps_map_lock
);
567 static_key_slow_inc(&rps_needed
);
569 kfree_rcu(old_map
, rcu
);
570 static_key_slow_dec(&rps_needed
);
572 free_cpumask_var(mask
);
576 static ssize_t
show_rps_dev_flow_table_cnt(struct netdev_rx_queue
*queue
,
577 struct rx_queue_attribute
*attr
,
580 struct rps_dev_flow_table
*flow_table
;
581 unsigned long val
= 0;
584 flow_table
= rcu_dereference(queue
->rps_flow_table
);
586 val
= (unsigned long)flow_table
->mask
+ 1;
589 return sprintf(buf
, "%lu\n", val
);
592 static void rps_dev_flow_table_release_work(struct work_struct
*work
)
594 struct rps_dev_flow_table
*table
= container_of(work
,
595 struct rps_dev_flow_table
, free_work
);
600 static void rps_dev_flow_table_release(struct rcu_head
*rcu
)
602 struct rps_dev_flow_table
*table
= container_of(rcu
,
603 struct rps_dev_flow_table
, rcu
);
605 INIT_WORK(&table
->free_work
, rps_dev_flow_table_release_work
);
606 schedule_work(&table
->free_work
);
609 static ssize_t
store_rps_dev_flow_table_cnt(struct netdev_rx_queue
*queue
,
610 struct rx_queue_attribute
*attr
,
611 const char *buf
, size_t len
)
613 unsigned long mask
, count
;
614 struct rps_dev_flow_table
*table
, *old_table
;
615 static DEFINE_SPINLOCK(rps_dev_flow_lock
);
618 if (!capable(CAP_NET_ADMIN
))
621 rc
= kstrtoul(buf
, 0, &count
);
627 /* mask = roundup_pow_of_two(count) - 1;
628 * without overflows...
630 while ((mask
| (mask
>> 1)) != mask
)
632 /* On 64 bit arches, must check mask fits in table->mask (u32),
633 * and on 32bit arches, must check RPS_DEV_FLOW_TABLE_SIZE(mask + 1)
636 #if BITS_PER_LONG > 32
637 if (mask
> (unsigned long)(u32
)mask
)
640 if (mask
> (ULONG_MAX
- RPS_DEV_FLOW_TABLE_SIZE(1))
641 / sizeof(struct rps_dev_flow
)) {
642 /* Enforce a limit to prevent overflow */
646 table
= vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask
+ 1));
651 for (count
= 0; count
<= mask
; count
++)
652 table
->flows
[count
].cpu
= RPS_NO_CPU
;
656 spin_lock(&rps_dev_flow_lock
);
657 old_table
= rcu_dereference_protected(queue
->rps_flow_table
,
658 lockdep_is_held(&rps_dev_flow_lock
));
659 rcu_assign_pointer(queue
->rps_flow_table
, table
);
660 spin_unlock(&rps_dev_flow_lock
);
663 call_rcu(&old_table
->rcu
, rps_dev_flow_table_release
);
668 static struct rx_queue_attribute rps_cpus_attribute
=
669 __ATTR(rps_cpus
, S_IRUGO
| S_IWUSR
, show_rps_map
, store_rps_map
);
672 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute
=
673 __ATTR(rps_flow_cnt
, S_IRUGO
| S_IWUSR
,
674 show_rps_dev_flow_table_cnt
, store_rps_dev_flow_table_cnt
);
676 static struct attribute
*rx_queue_default_attrs
[] = {
677 &rps_cpus_attribute
.attr
,
678 &rps_dev_flow_table_cnt_attribute
.attr
,
682 static void rx_queue_release(struct kobject
*kobj
)
684 struct netdev_rx_queue
*queue
= to_rx_queue(kobj
);
686 struct rps_dev_flow_table
*flow_table
;
689 map
= rcu_dereference_protected(queue
->rps_map
, 1);
691 RCU_INIT_POINTER(queue
->rps_map
, NULL
);
695 flow_table
= rcu_dereference_protected(queue
->rps_flow_table
, 1);
697 RCU_INIT_POINTER(queue
->rps_flow_table
, NULL
);
698 call_rcu(&flow_table
->rcu
, rps_dev_flow_table_release
);
701 memset(kobj
, 0, sizeof(*kobj
));
705 static struct kobj_type rx_queue_ktype
= {
706 .sysfs_ops
= &rx_queue_sysfs_ops
,
707 .release
= rx_queue_release
,
708 .default_attrs
= rx_queue_default_attrs
,
711 static int rx_queue_add_kobject(struct net_device
*net
, int index
)
713 struct netdev_rx_queue
*queue
= net
->_rx
+ index
;
714 struct kobject
*kobj
= &queue
->kobj
;
717 kobj
->kset
= net
->queues_kset
;
718 error
= kobject_init_and_add(kobj
, &rx_queue_ktype
, NULL
,
725 kobject_uevent(kobj
, KOBJ_ADD
);
726 dev_hold(queue
->dev
);
730 #endif /* CONFIG_RPS */
733 net_rx_queue_update_kobjects(struct net_device
*net
, int old_num
, int new_num
)
739 for (i
= old_num
; i
< new_num
; i
++) {
740 error
= rx_queue_add_kobject(net
, i
);
747 while (--i
>= new_num
)
748 kobject_put(&net
->_rx
[i
].kobj
);
758 * netdev_queue sysfs structures and functions.
760 struct netdev_queue_attribute
{
761 struct attribute attr
;
762 ssize_t (*show
)(struct netdev_queue
*queue
,
763 struct netdev_queue_attribute
*attr
, char *buf
);
764 ssize_t (*store
)(struct netdev_queue
*queue
,
765 struct netdev_queue_attribute
*attr
, const char *buf
, size_t len
);
767 #define to_netdev_queue_attr(_attr) container_of(_attr, \
768 struct netdev_queue_attribute, attr)
770 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
772 static ssize_t
netdev_queue_attr_show(struct kobject
*kobj
,
773 struct attribute
*attr
, char *buf
)
775 struct netdev_queue_attribute
*attribute
= to_netdev_queue_attr(attr
);
776 struct netdev_queue
*queue
= to_netdev_queue(kobj
);
778 if (!attribute
->show
)
781 return attribute
->show(queue
, attribute
, buf
);
784 static ssize_t
netdev_queue_attr_store(struct kobject
*kobj
,
785 struct attribute
*attr
,
786 const char *buf
, size_t count
)
788 struct netdev_queue_attribute
*attribute
= to_netdev_queue_attr(attr
);
789 struct netdev_queue
*queue
= to_netdev_queue(kobj
);
791 if (!attribute
->store
)
794 return attribute
->store(queue
, attribute
, buf
, count
);
797 static const struct sysfs_ops netdev_queue_sysfs_ops
= {
798 .show
= netdev_queue_attr_show
,
799 .store
= netdev_queue_attr_store
,
802 static ssize_t
show_trans_timeout(struct netdev_queue
*queue
,
803 struct netdev_queue_attribute
*attribute
,
806 unsigned long trans_timeout
;
808 spin_lock_irq(&queue
->_xmit_lock
);
809 trans_timeout
= queue
->trans_timeout
;
810 spin_unlock_irq(&queue
->_xmit_lock
);
812 return sprintf(buf
, "%lu", trans_timeout
);
815 static struct netdev_queue_attribute queue_trans_timeout
=
816 __ATTR(tx_timeout
, S_IRUGO
, show_trans_timeout
, NULL
);
820 * Byte queue limits sysfs structures and functions.
822 static ssize_t
bql_show(char *buf
, unsigned int value
)
824 return sprintf(buf
, "%u\n", value
);
827 static ssize_t
bql_set(const char *buf
, const size_t count
,
828 unsigned int *pvalue
)
833 if (!strcmp(buf
, "max") || !strcmp(buf
, "max\n"))
834 value
= DQL_MAX_LIMIT
;
836 err
= kstrtouint(buf
, 10, &value
);
839 if (value
> DQL_MAX_LIMIT
)
848 static ssize_t
bql_show_hold_time(struct netdev_queue
*queue
,
849 struct netdev_queue_attribute
*attr
,
852 struct dql
*dql
= &queue
->dql
;
854 return sprintf(buf
, "%u\n", jiffies_to_msecs(dql
->slack_hold_time
));
857 static ssize_t
bql_set_hold_time(struct netdev_queue
*queue
,
858 struct netdev_queue_attribute
*attribute
,
859 const char *buf
, size_t len
)
861 struct dql
*dql
= &queue
->dql
;
865 err
= kstrtouint(buf
, 10, &value
);
869 dql
->slack_hold_time
= msecs_to_jiffies(value
);
874 static struct netdev_queue_attribute bql_hold_time_attribute
=
875 __ATTR(hold_time
, S_IRUGO
| S_IWUSR
, bql_show_hold_time
,
878 static ssize_t
bql_show_inflight(struct netdev_queue
*queue
,
879 struct netdev_queue_attribute
*attr
,
882 struct dql
*dql
= &queue
->dql
;
884 return sprintf(buf
, "%u\n", dql
->num_queued
- dql
->num_completed
);
887 static struct netdev_queue_attribute bql_inflight_attribute
=
888 __ATTR(inflight
, S_IRUGO
, bql_show_inflight
, NULL
);
890 #define BQL_ATTR(NAME, FIELD) \
891 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
892 struct netdev_queue_attribute *attr, \
895 return bql_show(buf, queue->dql.FIELD); \
898 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
899 struct netdev_queue_attribute *attr, \
900 const char *buf, size_t len) \
902 return bql_set(buf, len, &queue->dql.FIELD); \
905 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \
906 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \
909 BQL_ATTR(limit
, limit
)
910 BQL_ATTR(limit_max
, max_limit
)
911 BQL_ATTR(limit_min
, min_limit
)
913 static struct attribute
*dql_attrs
[] = {
914 &bql_limit_attribute
.attr
,
915 &bql_limit_max_attribute
.attr
,
916 &bql_limit_min_attribute
.attr
,
917 &bql_hold_time_attribute
.attr
,
918 &bql_inflight_attribute
.attr
,
922 static struct attribute_group dql_group
= {
923 .name
= "byte_queue_limits",
926 #endif /* CONFIG_BQL */
929 static inline unsigned int get_netdev_queue_index(struct netdev_queue
*queue
)
931 struct net_device
*dev
= queue
->dev
;
934 for (i
= 0; i
< dev
->num_tx_queues
; i
++)
935 if (queue
== &dev
->_tx
[i
])
938 BUG_ON(i
>= dev
->num_tx_queues
);
944 static ssize_t
show_xps_map(struct netdev_queue
*queue
,
945 struct netdev_queue_attribute
*attribute
, char *buf
)
947 struct net_device
*dev
= queue
->dev
;
948 struct xps_dev_maps
*dev_maps
;
954 if (!zalloc_cpumask_var(&mask
, GFP_KERNEL
))
957 index
= get_netdev_queue_index(queue
);
960 dev_maps
= rcu_dereference(dev
->xps_maps
);
962 for_each_possible_cpu(i
) {
963 struct xps_map
*map
=
964 rcu_dereference(dev_maps
->cpu_map
[i
]);
967 for (j
= 0; j
< map
->len
; j
++) {
968 if (map
->queues
[j
] == index
) {
969 cpumask_set_cpu(i
, mask
);
978 len
+= cpumask_scnprintf(buf
+ len
, PAGE_SIZE
, mask
);
979 if (PAGE_SIZE
- len
< 3) {
980 free_cpumask_var(mask
);
984 free_cpumask_var(mask
);
985 len
+= sprintf(buf
+ len
, "\n");
989 static DEFINE_MUTEX(xps_map_mutex
);
990 #define xmap_dereference(P) \
991 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
993 static void xps_queue_release(struct netdev_queue
*queue
)
995 struct net_device
*dev
= queue
->dev
;
996 struct xps_dev_maps
*dev_maps
;
999 int i
, pos
, nonempty
= 0;
1001 index
= get_netdev_queue_index(queue
);
1003 mutex_lock(&xps_map_mutex
);
1004 dev_maps
= xmap_dereference(dev
->xps_maps
);
1007 for_each_possible_cpu(i
) {
1008 map
= xmap_dereference(dev_maps
->cpu_map
[i
]);
1012 for (pos
= 0; pos
< map
->len
; pos
++)
1013 if (map
->queues
[pos
] == index
)
1016 if (pos
< map
->len
) {
1019 map
->queues
[--map
->len
];
1021 RCU_INIT_POINTER(dev_maps
->cpu_map
[i
],
1023 kfree_rcu(map
, rcu
);
1032 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1033 kfree_rcu(dev_maps
, rcu
);
1036 mutex_unlock(&xps_map_mutex
);
1039 static ssize_t
store_xps_map(struct netdev_queue
*queue
,
1040 struct netdev_queue_attribute
*attribute
,
1041 const char *buf
, size_t len
)
1043 struct net_device
*dev
= queue
->dev
;
1045 int err
, i
, cpu
, pos
, map_len
, alloc_len
, need_set
;
1046 unsigned long index
;
1047 struct xps_map
*map
, *new_map
;
1048 struct xps_dev_maps
*dev_maps
, *new_dev_maps
;
1050 int numa_node_id
= -2;
1052 if (!capable(CAP_NET_ADMIN
))
1055 if (!alloc_cpumask_var(&mask
, GFP_KERNEL
))
1058 index
= get_netdev_queue_index(queue
);
1060 err
= bitmap_parse(buf
, len
, cpumask_bits(mask
), nr_cpumask_bits
);
1062 free_cpumask_var(mask
);
1066 new_dev_maps
= kzalloc(max_t(unsigned int,
1067 XPS_DEV_MAPS_SIZE
, L1_CACHE_BYTES
), GFP_KERNEL
);
1068 if (!new_dev_maps
) {
1069 free_cpumask_var(mask
);
1073 mutex_lock(&xps_map_mutex
);
1075 dev_maps
= xmap_dereference(dev
->xps_maps
);
1077 for_each_possible_cpu(cpu
) {
1079 xmap_dereference(dev_maps
->cpu_map
[cpu
]) : NULL
;
1082 for (pos
= 0; pos
< map
->len
; pos
++)
1083 if (map
->queues
[pos
] == index
)
1086 alloc_len
= map
->alloc_len
;
1088 pos
= map_len
= alloc_len
= 0;
1090 need_set
= cpumask_test_cpu(cpu
, mask
) && cpu_online(cpu
);
1093 if (numa_node_id
== -2)
1094 numa_node_id
= cpu_to_node(cpu
);
1095 else if (numa_node_id
!= cpu_to_node(cpu
))
1099 if (need_set
&& pos
>= map_len
) {
1100 /* Need to add queue to this CPU's map */
1101 if (map_len
>= alloc_len
) {
1102 alloc_len
= alloc_len
?
1103 2 * alloc_len
: XPS_MIN_MAP_ALLOC
;
1104 new_map
= kzalloc_node(XPS_MAP_SIZE(alloc_len
),
1109 new_map
->alloc_len
= alloc_len
;
1110 for (i
= 0; i
< map_len
; i
++)
1111 new_map
->queues
[i
] = map
->queues
[i
];
1112 new_map
->len
= map_len
;
1114 new_map
->queues
[new_map
->len
++] = index
;
1115 } else if (!need_set
&& pos
< map_len
) {
1116 /* Need to remove queue from this CPU's map */
1118 new_map
->queues
[pos
] =
1119 new_map
->queues
[--new_map
->len
];
1123 RCU_INIT_POINTER(new_dev_maps
->cpu_map
[cpu
], new_map
);
1126 /* Cleanup old maps */
1127 for_each_possible_cpu(cpu
) {
1129 xmap_dereference(dev_maps
->cpu_map
[cpu
]) : NULL
;
1130 if (map
&& xmap_dereference(new_dev_maps
->cpu_map
[cpu
]) != map
)
1131 kfree_rcu(map
, rcu
);
1132 if (new_dev_maps
->cpu_map
[cpu
])
1137 rcu_assign_pointer(dev
->xps_maps
, new_dev_maps
);
1139 kfree(new_dev_maps
);
1140 RCU_INIT_POINTER(dev
->xps_maps
, NULL
);
1144 kfree_rcu(dev_maps
, rcu
);
1146 netdev_queue_numa_node_write(queue
, (numa_node_id
>= 0) ? numa_node_id
:
1149 mutex_unlock(&xps_map_mutex
);
1151 free_cpumask_var(mask
);
1155 mutex_unlock(&xps_map_mutex
);
1158 for_each_possible_cpu(i
)
1159 kfree(rcu_dereference_protected(
1160 new_dev_maps
->cpu_map
[i
],
1162 kfree(new_dev_maps
);
1163 free_cpumask_var(mask
);
1167 static struct netdev_queue_attribute xps_cpus_attribute
=
1168 __ATTR(xps_cpus
, S_IRUGO
| S_IWUSR
, show_xps_map
, store_xps_map
);
1169 #endif /* CONFIG_XPS */
1171 static struct attribute
*netdev_queue_default_attrs
[] = {
1172 &queue_trans_timeout
.attr
,
1174 &xps_cpus_attribute
.attr
,
1179 static void netdev_queue_release(struct kobject
*kobj
)
1181 struct netdev_queue
*queue
= to_netdev_queue(kobj
);
1184 xps_queue_release(queue
);
1187 memset(kobj
, 0, sizeof(*kobj
));
1188 dev_put(queue
->dev
);
1191 static struct kobj_type netdev_queue_ktype
= {
1192 .sysfs_ops
= &netdev_queue_sysfs_ops
,
1193 .release
= netdev_queue_release
,
1194 .default_attrs
= netdev_queue_default_attrs
,
1197 static int netdev_queue_add_kobject(struct net_device
*net
, int index
)
1199 struct netdev_queue
*queue
= net
->_tx
+ index
;
1200 struct kobject
*kobj
= &queue
->kobj
;
1203 kobj
->kset
= net
->queues_kset
;
1204 error
= kobject_init_and_add(kobj
, &netdev_queue_ktype
, NULL
,
1210 error
= sysfs_create_group(kobj
, &dql_group
);
1215 kobject_uevent(kobj
, KOBJ_ADD
);
1216 dev_hold(queue
->dev
);
1223 #endif /* CONFIG_SYSFS */
1226 netdev_queue_update_kobjects(struct net_device
*net
, int old_num
, int new_num
)
1232 for (i
= old_num
; i
< new_num
; i
++) {
1233 error
= netdev_queue_add_kobject(net
, i
);
1240 while (--i
>= new_num
) {
1241 struct netdev_queue
*queue
= net
->_tx
+ i
;
1244 sysfs_remove_group(&queue
->kobj
, &dql_group
);
1246 kobject_put(&queue
->kobj
);
1252 #endif /* CONFIG_SYSFS */
1255 static int register_queue_kobjects(struct net_device
*net
)
1257 int error
= 0, txq
= 0, rxq
= 0, real_rx
= 0, real_tx
= 0;
1260 net
->queues_kset
= kset_create_and_add("queues",
1261 NULL
, &net
->dev
.kobj
);
1262 if (!net
->queues_kset
)
1267 real_rx
= net
->real_num_rx_queues
;
1269 real_tx
= net
->real_num_tx_queues
;
1271 error
= net_rx_queue_update_kobjects(net
, 0, real_rx
);
1276 error
= netdev_queue_update_kobjects(net
, 0, real_tx
);
1284 netdev_queue_update_kobjects(net
, txq
, 0);
1285 net_rx_queue_update_kobjects(net
, rxq
, 0);
1289 static void remove_queue_kobjects(struct net_device
*net
)
1291 int real_rx
= 0, real_tx
= 0;
1294 real_rx
= net
->real_num_rx_queues
;
1296 real_tx
= net
->real_num_tx_queues
;
1298 net_rx_queue_update_kobjects(net
, real_rx
, 0);
1299 netdev_queue_update_kobjects(net
, real_tx
, 0);
1301 kset_unregister(net
->queues_kset
);
1305 static void *net_grab_current_ns(void)
1307 struct net
*ns
= current
->nsproxy
->net_ns
;
1308 #ifdef CONFIG_NET_NS
1310 atomic_inc(&ns
->passive
);
1315 static const void *net_initial_ns(void)
1320 static const void *net_netlink_ns(struct sock
*sk
)
1322 return sock_net(sk
);
1325 struct kobj_ns_type_operations net_ns_type_operations
= {
1326 .type
= KOBJ_NS_TYPE_NET
,
1327 .grab_current_ns
= net_grab_current_ns
,
1328 .netlink_ns
= net_netlink_ns
,
1329 .initial_ns
= net_initial_ns
,
1330 .drop_ns
= net_drop_ns
,
1332 EXPORT_SYMBOL_GPL(net_ns_type_operations
);
1334 #ifdef CONFIG_HOTPLUG
1335 static int netdev_uevent(struct device
*d
, struct kobj_uevent_env
*env
)
1337 struct net_device
*dev
= to_net_dev(d
);
1340 /* pass interface to uevent. */
1341 retval
= add_uevent_var(env
, "INTERFACE=%s", dev
->name
);
1345 /* pass ifindex to uevent.
1346 * ifindex is useful as it won't change (interface name may change)
1347 * and is what RtNetlink uses natively. */
1348 retval
= add_uevent_var(env
, "IFINDEX=%d", dev
->ifindex
);
1356 * netdev_release -- destroy and free a dead device.
1357 * Called when last reference to device kobject is gone.
1359 static void netdev_release(struct device
*d
)
1361 struct net_device
*dev
= to_net_dev(d
);
1363 BUG_ON(dev
->reg_state
!= NETREG_RELEASED
);
1365 kfree(dev
->ifalias
);
1366 kfree((char *)dev
- dev
->padded
);
1369 static const void *net_namespace(struct device
*d
)
1371 struct net_device
*dev
;
1372 dev
= container_of(d
, struct net_device
, dev
);
1373 return dev_net(dev
);
1376 static struct class net_class
= {
1378 .dev_release
= netdev_release
,
1380 .dev_attrs
= net_class_attributes
,
1381 #endif /* CONFIG_SYSFS */
1382 #ifdef CONFIG_HOTPLUG
1383 .dev_uevent
= netdev_uevent
,
1385 .ns_type
= &net_ns_type_operations
,
1386 .namespace = net_namespace
,
1389 /* Delete sysfs entries but hold kobject reference until after all
1390 * netdev references are gone.
1392 void netdev_unregister_kobject(struct net_device
* net
)
1394 struct device
*dev
= &(net
->dev
);
1396 kobject_get(&dev
->kobj
);
1398 remove_queue_kobjects(net
);
1403 /* Create sysfs entries for network device. */
1404 int netdev_register_kobject(struct net_device
*net
)
1406 struct device
*dev
= &(net
->dev
);
1407 const struct attribute_group
**groups
= net
->sysfs_groups
;
1410 device_initialize(dev
);
1411 dev
->class = &net_class
;
1412 dev
->platform_data
= net
;
1413 dev
->groups
= groups
;
1415 dev_set_name(dev
, "%s", net
->name
);
1418 /* Allow for a device specific group */
1422 *groups
++ = &netstat_group
;
1424 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1425 if (net
->ieee80211_ptr
)
1426 *groups
++ = &wireless_group
;
1427 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1428 else if (net
->wireless_handlers
)
1429 *groups
++ = &wireless_group
;
1432 #endif /* CONFIG_SYSFS */
1434 error
= device_add(dev
);
1438 error
= register_queue_kobjects(net
);
1447 int netdev_class_create_file(struct class_attribute
*class_attr
)
1449 return class_create_file(&net_class
, class_attr
);
1451 EXPORT_SYMBOL(netdev_class_create_file
);
1453 void netdev_class_remove_file(struct class_attribute
*class_attr
)
1455 class_remove_file(&net_class
, class_attr
);
1457 EXPORT_SYMBOL(netdev_class_remove_file
);
1459 int netdev_kobject_init(void)
1461 kobj_ns_type_register(&net_ns_type_operations
);
1462 return class_register(&net_class
);