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/vmalloc.h>
22 #include <linux/export.h>
23 #include <linux/jiffies.h>
25 #include "net-sysfs.h"
28 static const char fmt_hex
[] = "%#x\n";
29 static const char fmt_long_hex
[] = "%#lx\n";
30 static const char fmt_dec
[] = "%d\n";
31 static const char fmt_udec
[] = "%u\n";
32 static const char fmt_ulong
[] = "%lu\n";
33 static const char fmt_u64
[] = "%llu\n";
35 static inline int dev_isalive(const struct net_device
*dev
)
37 return dev
->reg_state
<= NETREG_REGISTERED
;
40 /* use same locking rules as GIF* ioctl's */
41 static ssize_t
netdev_show(const struct device
*dev
,
42 struct device_attribute
*attr
, char *buf
,
43 ssize_t (*format
)(const struct net_device
*, char *))
45 struct net_device
*net
= to_net_dev(dev
);
46 ssize_t ret
= -EINVAL
;
48 read_lock(&dev_base_lock
);
50 ret
= (*format
)(net
, buf
);
51 read_unlock(&dev_base_lock
);
56 /* generate a show function for simple field */
57 #define NETDEVICE_SHOW(field, format_string) \
58 static ssize_t format_##field(const struct net_device *net, char *buf) \
60 return sprintf(buf, format_string, net->field); \
62 static ssize_t show_##field(struct device *dev, \
63 struct device_attribute *attr, char *buf) \
65 return netdev_show(dev, attr, buf, format_##field); \
69 /* use same locking and permission rules as SIF* ioctl's */
70 static ssize_t
netdev_store(struct device
*dev
, struct device_attribute
*attr
,
71 const char *buf
, size_t len
,
72 int (*set
)(struct net_device
*, unsigned long))
74 struct net_device
*netdev
= to_net_dev(dev
);
75 struct net
*net
= dev_net(netdev
);
79 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
82 ret
= kstrtoul(buf
, 0, &new);
87 return restart_syscall();
89 if (dev_isalive(netdev
)) {
90 if ((ret
= (*set
)(netdev
, new)) == 0)
98 NETDEVICE_SHOW(dev_id
, fmt_hex
);
99 NETDEVICE_SHOW(addr_assign_type
, fmt_dec
);
100 NETDEVICE_SHOW(addr_len
, fmt_dec
);
101 NETDEVICE_SHOW(iflink
, fmt_dec
);
102 NETDEVICE_SHOW(ifindex
, fmt_dec
);
103 NETDEVICE_SHOW(type
, fmt_dec
);
104 NETDEVICE_SHOW(link_mode
, fmt_dec
);
106 /* use same locking rules as GIFHWADDR ioctl's */
107 static ssize_t
show_address(struct device
*dev
, struct device_attribute
*attr
,
110 struct net_device
*net
= to_net_dev(dev
);
111 ssize_t ret
= -EINVAL
;
113 read_lock(&dev_base_lock
);
114 if (dev_isalive(net
))
115 ret
= sysfs_format_mac(buf
, net
->dev_addr
, net
->addr_len
);
116 read_unlock(&dev_base_lock
);
120 static ssize_t
show_broadcast(struct device
*dev
,
121 struct device_attribute
*attr
, char *buf
)
123 struct net_device
*net
= to_net_dev(dev
);
124 if (dev_isalive(net
))
125 return sysfs_format_mac(buf
, net
->broadcast
, net
->addr_len
);
129 static int change_carrier(struct net_device
*net
, unsigned long new_carrier
)
131 if (!netif_running(net
))
133 return dev_change_carrier(net
, (bool) new_carrier
);
136 static ssize_t
store_carrier(struct device
*dev
, struct device_attribute
*attr
,
137 const char *buf
, size_t len
)
139 return netdev_store(dev
, attr
, buf
, len
, change_carrier
);
142 static ssize_t
show_carrier(struct device
*dev
,
143 struct device_attribute
*attr
, char *buf
)
145 struct net_device
*netdev
= to_net_dev(dev
);
146 if (netif_running(netdev
)) {
147 return sprintf(buf
, fmt_dec
, !!netif_carrier_ok(netdev
));
152 static ssize_t
show_speed(struct device
*dev
,
153 struct device_attribute
*attr
, char *buf
)
155 struct net_device
*netdev
= to_net_dev(dev
);
159 return restart_syscall();
161 if (netif_running(netdev
)) {
162 struct ethtool_cmd cmd
;
163 if (!__ethtool_get_settings(netdev
, &cmd
))
164 ret
= sprintf(buf
, fmt_udec
, ethtool_cmd_speed(&cmd
));
170 static ssize_t
show_duplex(struct device
*dev
,
171 struct device_attribute
*attr
, char *buf
)
173 struct net_device
*netdev
= to_net_dev(dev
);
177 return restart_syscall();
179 if (netif_running(netdev
)) {
180 struct ethtool_cmd cmd
;
181 if (!__ethtool_get_settings(netdev
, &cmd
)) {
183 switch (cmd
.duplex
) {
194 ret
= sprintf(buf
, "%s\n", duplex
);
201 static ssize_t
show_dormant(struct device
*dev
,
202 struct device_attribute
*attr
, char *buf
)
204 struct net_device
*netdev
= to_net_dev(dev
);
206 if (netif_running(netdev
))
207 return sprintf(buf
, fmt_dec
, !!netif_dormant(netdev
));
212 static const char *const operstates
[] = {
214 "notpresent", /* currently unused */
217 "testing", /* currently unused */
222 static ssize_t
show_operstate(struct device
*dev
,
223 struct device_attribute
*attr
, char *buf
)
225 const struct net_device
*netdev
= to_net_dev(dev
);
226 unsigned char operstate
;
228 read_lock(&dev_base_lock
);
229 operstate
= netdev
->operstate
;
230 if (!netif_running(netdev
))
231 operstate
= IF_OPER_DOWN
;
232 read_unlock(&dev_base_lock
);
234 if (operstate
>= ARRAY_SIZE(operstates
))
235 return -EINVAL
; /* should not happen */
237 return sprintf(buf
, "%s\n", operstates
[operstate
]);
240 /* read-write attributes */
241 NETDEVICE_SHOW(mtu
, fmt_dec
);
243 static int change_mtu(struct net_device
*net
, unsigned long new_mtu
)
245 return dev_set_mtu(net
, (int) new_mtu
);
248 static ssize_t
store_mtu(struct device
*dev
, struct device_attribute
*attr
,
249 const char *buf
, size_t len
)
251 return netdev_store(dev
, attr
, buf
, len
, change_mtu
);
254 NETDEVICE_SHOW(flags
, fmt_hex
);
256 static int change_flags(struct net_device
*net
, unsigned long new_flags
)
258 return dev_change_flags(net
, (unsigned int) new_flags
);
261 static ssize_t
store_flags(struct device
*dev
, struct device_attribute
*attr
,
262 const char *buf
, size_t len
)
264 return netdev_store(dev
, attr
, buf
, len
, change_flags
);
267 NETDEVICE_SHOW(tx_queue_len
, fmt_ulong
);
269 static int change_tx_queue_len(struct net_device
*net
, unsigned long new_len
)
271 net
->tx_queue_len
= new_len
;
275 static ssize_t
store_tx_queue_len(struct device
*dev
,
276 struct device_attribute
*attr
,
277 const char *buf
, size_t len
)
279 if (!capable(CAP_NET_ADMIN
))
282 return netdev_store(dev
, attr
, buf
, len
, change_tx_queue_len
);
285 static ssize_t
store_ifalias(struct device
*dev
, struct device_attribute
*attr
,
286 const char *buf
, size_t len
)
288 struct net_device
*netdev
= to_net_dev(dev
);
289 struct net
*net
= dev_net(netdev
);
293 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
296 /* ignore trailing newline */
297 if (len
> 0 && buf
[len
- 1] == '\n')
301 return restart_syscall();
302 ret
= dev_set_alias(netdev
, buf
, count
);
305 return ret
< 0 ? ret
: len
;
308 static ssize_t
show_ifalias(struct device
*dev
,
309 struct device_attribute
*attr
, char *buf
)
311 const struct net_device
*netdev
= to_net_dev(dev
);
315 return restart_syscall();
317 ret
= sprintf(buf
, "%s\n", netdev
->ifalias
);
322 NETDEVICE_SHOW(group
, fmt_dec
);
324 static int change_group(struct net_device
*net
, unsigned long new_group
)
326 dev_set_group(net
, (int) new_group
);
330 static ssize_t
store_group(struct device
*dev
, struct device_attribute
*attr
,
331 const char *buf
, size_t len
)
333 return netdev_store(dev
, attr
, buf
, len
, change_group
);
336 static struct device_attribute net_class_attributes
[] = {
337 __ATTR(addr_assign_type
, S_IRUGO
, show_addr_assign_type
, NULL
),
338 __ATTR(addr_len
, S_IRUGO
, show_addr_len
, NULL
),
339 __ATTR(dev_id
, S_IRUGO
, show_dev_id
, NULL
),
340 __ATTR(ifalias
, S_IRUGO
| S_IWUSR
, show_ifalias
, store_ifalias
),
341 __ATTR(iflink
, S_IRUGO
, show_iflink
, NULL
),
342 __ATTR(ifindex
, S_IRUGO
, show_ifindex
, NULL
),
343 __ATTR(type
, S_IRUGO
, show_type
, NULL
),
344 __ATTR(link_mode
, S_IRUGO
, show_link_mode
, NULL
),
345 __ATTR(address
, S_IRUGO
, show_address
, NULL
),
346 __ATTR(broadcast
, S_IRUGO
, show_broadcast
, NULL
),
347 __ATTR(carrier
, S_IRUGO
| S_IWUSR
, show_carrier
, store_carrier
),
348 __ATTR(speed
, S_IRUGO
, show_speed
, NULL
),
349 __ATTR(duplex
, S_IRUGO
, show_duplex
, NULL
),
350 __ATTR(dormant
, S_IRUGO
, show_dormant
, NULL
),
351 __ATTR(operstate
, S_IRUGO
, show_operstate
, NULL
),
352 __ATTR(mtu
, S_IRUGO
| S_IWUSR
, show_mtu
, store_mtu
),
353 __ATTR(flags
, S_IRUGO
| S_IWUSR
, show_flags
, store_flags
),
354 __ATTR(tx_queue_len
, S_IRUGO
| S_IWUSR
, show_tx_queue_len
,
356 __ATTR(netdev_group
, S_IRUGO
| S_IWUSR
, show_group
, store_group
),
360 /* Show a given an attribute in the statistics group */
361 static ssize_t
netstat_show(const struct device
*d
,
362 struct device_attribute
*attr
, char *buf
,
363 unsigned long offset
)
365 struct net_device
*dev
= to_net_dev(d
);
366 ssize_t ret
= -EINVAL
;
368 WARN_ON(offset
> sizeof(struct rtnl_link_stats64
) ||
369 offset
% sizeof(u64
) != 0);
371 read_lock(&dev_base_lock
);
372 if (dev_isalive(dev
)) {
373 struct rtnl_link_stats64 temp
;
374 const struct rtnl_link_stats64
*stats
= dev_get_stats(dev
, &temp
);
376 ret
= sprintf(buf
, fmt_u64
, *(u64
*)(((u8
*) stats
) + offset
));
378 read_unlock(&dev_base_lock
);
382 /* generate a read-only statistics attribute */
383 #define NETSTAT_ENTRY(name) \
384 static ssize_t show_##name(struct device *d, \
385 struct device_attribute *attr, char *buf) \
387 return netstat_show(d, attr, buf, \
388 offsetof(struct rtnl_link_stats64, name)); \
390 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
392 NETSTAT_ENTRY(rx_packets
);
393 NETSTAT_ENTRY(tx_packets
);
394 NETSTAT_ENTRY(rx_bytes
);
395 NETSTAT_ENTRY(tx_bytes
);
396 NETSTAT_ENTRY(rx_errors
);
397 NETSTAT_ENTRY(tx_errors
);
398 NETSTAT_ENTRY(rx_dropped
);
399 NETSTAT_ENTRY(tx_dropped
);
400 NETSTAT_ENTRY(multicast
);
401 NETSTAT_ENTRY(collisions
);
402 NETSTAT_ENTRY(rx_length_errors
);
403 NETSTAT_ENTRY(rx_over_errors
);
404 NETSTAT_ENTRY(rx_crc_errors
);
405 NETSTAT_ENTRY(rx_frame_errors
);
406 NETSTAT_ENTRY(rx_fifo_errors
);
407 NETSTAT_ENTRY(rx_missed_errors
);
408 NETSTAT_ENTRY(tx_aborted_errors
);
409 NETSTAT_ENTRY(tx_carrier_errors
);
410 NETSTAT_ENTRY(tx_fifo_errors
);
411 NETSTAT_ENTRY(tx_heartbeat_errors
);
412 NETSTAT_ENTRY(tx_window_errors
);
413 NETSTAT_ENTRY(rx_compressed
);
414 NETSTAT_ENTRY(tx_compressed
);
416 static struct attribute
*netstat_attrs
[] = {
417 &dev_attr_rx_packets
.attr
,
418 &dev_attr_tx_packets
.attr
,
419 &dev_attr_rx_bytes
.attr
,
420 &dev_attr_tx_bytes
.attr
,
421 &dev_attr_rx_errors
.attr
,
422 &dev_attr_tx_errors
.attr
,
423 &dev_attr_rx_dropped
.attr
,
424 &dev_attr_tx_dropped
.attr
,
425 &dev_attr_multicast
.attr
,
426 &dev_attr_collisions
.attr
,
427 &dev_attr_rx_length_errors
.attr
,
428 &dev_attr_rx_over_errors
.attr
,
429 &dev_attr_rx_crc_errors
.attr
,
430 &dev_attr_rx_frame_errors
.attr
,
431 &dev_attr_rx_fifo_errors
.attr
,
432 &dev_attr_rx_missed_errors
.attr
,
433 &dev_attr_tx_aborted_errors
.attr
,
434 &dev_attr_tx_carrier_errors
.attr
,
435 &dev_attr_tx_fifo_errors
.attr
,
436 &dev_attr_tx_heartbeat_errors
.attr
,
437 &dev_attr_tx_window_errors
.attr
,
438 &dev_attr_rx_compressed
.attr
,
439 &dev_attr_tx_compressed
.attr
,
444 static struct attribute_group netstat_group
= {
445 .name
= "statistics",
446 .attrs
= netstat_attrs
,
449 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
450 static struct attribute
*wireless_attrs
[] = {
454 static struct attribute_group wireless_group
= {
456 .attrs
= wireless_attrs
,
459 #endif /* CONFIG_SYSFS */
463 * RX queue sysfs structures and functions.
465 struct rx_queue_attribute
{
466 struct attribute attr
;
467 ssize_t (*show
)(struct netdev_rx_queue
*queue
,
468 struct rx_queue_attribute
*attr
, char *buf
);
469 ssize_t (*store
)(struct netdev_rx_queue
*queue
,
470 struct rx_queue_attribute
*attr
, const char *buf
, size_t len
);
472 #define to_rx_queue_attr(_attr) container_of(_attr, \
473 struct rx_queue_attribute, attr)
475 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
477 static ssize_t
rx_queue_attr_show(struct kobject
*kobj
, struct attribute
*attr
,
480 struct rx_queue_attribute
*attribute
= to_rx_queue_attr(attr
);
481 struct netdev_rx_queue
*queue
= to_rx_queue(kobj
);
483 if (!attribute
->show
)
486 return attribute
->show(queue
, attribute
, buf
);
489 static ssize_t
rx_queue_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
490 const char *buf
, size_t count
)
492 struct rx_queue_attribute
*attribute
= to_rx_queue_attr(attr
);
493 struct netdev_rx_queue
*queue
= to_rx_queue(kobj
);
495 if (!attribute
->store
)
498 return attribute
->store(queue
, attribute
, buf
, count
);
501 static const struct sysfs_ops rx_queue_sysfs_ops
= {
502 .show
= rx_queue_attr_show
,
503 .store
= rx_queue_attr_store
,
506 static ssize_t
show_rps_map(struct netdev_rx_queue
*queue
,
507 struct rx_queue_attribute
*attribute
, char *buf
)
514 if (!zalloc_cpumask_var(&mask
, GFP_KERNEL
))
518 map
= rcu_dereference(queue
->rps_map
);
520 for (i
= 0; i
< map
->len
; i
++)
521 cpumask_set_cpu(map
->cpus
[i
], mask
);
523 len
+= cpumask_scnprintf(buf
+ len
, PAGE_SIZE
, mask
);
524 if (PAGE_SIZE
- len
< 3) {
526 free_cpumask_var(mask
);
531 free_cpumask_var(mask
);
532 len
+= sprintf(buf
+ len
, "\n");
536 static ssize_t
store_rps_map(struct netdev_rx_queue
*queue
,
537 struct rx_queue_attribute
*attribute
,
538 const char *buf
, size_t len
)
540 struct rps_map
*old_map
, *map
;
543 static DEFINE_SPINLOCK(rps_map_lock
);
545 if (!capable(CAP_NET_ADMIN
))
548 if (!alloc_cpumask_var(&mask
, GFP_KERNEL
))
551 err
= bitmap_parse(buf
, len
, cpumask_bits(mask
), nr_cpumask_bits
);
553 free_cpumask_var(mask
);
557 map
= kzalloc(max_t(unsigned int,
558 RPS_MAP_SIZE(cpumask_weight(mask
)), L1_CACHE_BYTES
),
561 free_cpumask_var(mask
);
566 for_each_cpu_and(cpu
, mask
, cpu_online_mask
)
567 map
->cpus
[i
++] = cpu
;
576 spin_lock(&rps_map_lock
);
577 old_map
= rcu_dereference_protected(queue
->rps_map
,
578 lockdep_is_held(&rps_map_lock
));
579 rcu_assign_pointer(queue
->rps_map
, map
);
580 spin_unlock(&rps_map_lock
);
583 static_key_slow_inc(&rps_needed
);
585 kfree_rcu(old_map
, rcu
);
586 static_key_slow_dec(&rps_needed
);
588 free_cpumask_var(mask
);
592 static ssize_t
show_rps_dev_flow_table_cnt(struct netdev_rx_queue
*queue
,
593 struct rx_queue_attribute
*attr
,
596 struct rps_dev_flow_table
*flow_table
;
597 unsigned long val
= 0;
600 flow_table
= rcu_dereference(queue
->rps_flow_table
);
602 val
= (unsigned long)flow_table
->mask
+ 1;
605 return sprintf(buf
, "%lu\n", val
);
608 static void rps_dev_flow_table_release_work(struct work_struct
*work
)
610 struct rps_dev_flow_table
*table
= container_of(work
,
611 struct rps_dev_flow_table
, free_work
);
616 static void rps_dev_flow_table_release(struct rcu_head
*rcu
)
618 struct rps_dev_flow_table
*table
= container_of(rcu
,
619 struct rps_dev_flow_table
, rcu
);
621 INIT_WORK(&table
->free_work
, rps_dev_flow_table_release_work
);
622 schedule_work(&table
->free_work
);
625 static ssize_t
store_rps_dev_flow_table_cnt(struct netdev_rx_queue
*queue
,
626 struct rx_queue_attribute
*attr
,
627 const char *buf
, size_t len
)
629 unsigned long mask
, count
;
630 struct rps_dev_flow_table
*table
, *old_table
;
631 static DEFINE_SPINLOCK(rps_dev_flow_lock
);
634 if (!capable(CAP_NET_ADMIN
))
637 rc
= kstrtoul(buf
, 0, &count
);
643 /* mask = roundup_pow_of_two(count) - 1;
644 * without overflows...
646 while ((mask
| (mask
>> 1)) != mask
)
648 /* On 64 bit arches, must check mask fits in table->mask (u32),
649 * and on 32bit arches, must check RPS_DEV_FLOW_TABLE_SIZE(mask + 1)
652 #if BITS_PER_LONG > 32
653 if (mask
> (unsigned long)(u32
)mask
)
656 if (mask
> (ULONG_MAX
- RPS_DEV_FLOW_TABLE_SIZE(1))
657 / sizeof(struct rps_dev_flow
)) {
658 /* Enforce a limit to prevent overflow */
662 table
= vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask
+ 1));
667 for (count
= 0; count
<= mask
; count
++)
668 table
->flows
[count
].cpu
= RPS_NO_CPU
;
672 spin_lock(&rps_dev_flow_lock
);
673 old_table
= rcu_dereference_protected(queue
->rps_flow_table
,
674 lockdep_is_held(&rps_dev_flow_lock
));
675 rcu_assign_pointer(queue
->rps_flow_table
, table
);
676 spin_unlock(&rps_dev_flow_lock
);
679 call_rcu(&old_table
->rcu
, rps_dev_flow_table_release
);
684 static struct rx_queue_attribute rps_cpus_attribute
=
685 __ATTR(rps_cpus
, S_IRUGO
| S_IWUSR
, show_rps_map
, store_rps_map
);
688 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute
=
689 __ATTR(rps_flow_cnt
, S_IRUGO
| S_IWUSR
,
690 show_rps_dev_flow_table_cnt
, store_rps_dev_flow_table_cnt
);
692 static struct attribute
*rx_queue_default_attrs
[] = {
693 &rps_cpus_attribute
.attr
,
694 &rps_dev_flow_table_cnt_attribute
.attr
,
698 static void rx_queue_release(struct kobject
*kobj
)
700 struct netdev_rx_queue
*queue
= to_rx_queue(kobj
);
702 struct rps_dev_flow_table
*flow_table
;
705 map
= rcu_dereference_protected(queue
->rps_map
, 1);
707 RCU_INIT_POINTER(queue
->rps_map
, NULL
);
711 flow_table
= rcu_dereference_protected(queue
->rps_flow_table
, 1);
713 RCU_INIT_POINTER(queue
->rps_flow_table
, NULL
);
714 call_rcu(&flow_table
->rcu
, rps_dev_flow_table_release
);
717 memset(kobj
, 0, sizeof(*kobj
));
721 static struct kobj_type rx_queue_ktype
= {
722 .sysfs_ops
= &rx_queue_sysfs_ops
,
723 .release
= rx_queue_release
,
724 .default_attrs
= rx_queue_default_attrs
,
727 static int rx_queue_add_kobject(struct net_device
*net
, int index
)
729 struct netdev_rx_queue
*queue
= net
->_rx
+ index
;
730 struct kobject
*kobj
= &queue
->kobj
;
733 kobj
->kset
= net
->queues_kset
;
734 error
= kobject_init_and_add(kobj
, &rx_queue_ktype
, NULL
,
741 kobject_uevent(kobj
, KOBJ_ADD
);
742 dev_hold(queue
->dev
);
746 #endif /* CONFIG_RPS */
749 net_rx_queue_update_kobjects(struct net_device
*net
, int old_num
, int new_num
)
755 for (i
= old_num
; i
< new_num
; i
++) {
756 error
= rx_queue_add_kobject(net
, i
);
763 while (--i
>= new_num
)
764 kobject_put(&net
->_rx
[i
].kobj
);
774 * netdev_queue sysfs structures and functions.
776 struct netdev_queue_attribute
{
777 struct attribute attr
;
778 ssize_t (*show
)(struct netdev_queue
*queue
,
779 struct netdev_queue_attribute
*attr
, char *buf
);
780 ssize_t (*store
)(struct netdev_queue
*queue
,
781 struct netdev_queue_attribute
*attr
, const char *buf
, size_t len
);
783 #define to_netdev_queue_attr(_attr) container_of(_attr, \
784 struct netdev_queue_attribute, attr)
786 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
788 static ssize_t
netdev_queue_attr_show(struct kobject
*kobj
,
789 struct attribute
*attr
, char *buf
)
791 struct netdev_queue_attribute
*attribute
= to_netdev_queue_attr(attr
);
792 struct netdev_queue
*queue
= to_netdev_queue(kobj
);
794 if (!attribute
->show
)
797 return attribute
->show(queue
, attribute
, buf
);
800 static ssize_t
netdev_queue_attr_store(struct kobject
*kobj
,
801 struct attribute
*attr
,
802 const char *buf
, size_t count
)
804 struct netdev_queue_attribute
*attribute
= to_netdev_queue_attr(attr
);
805 struct netdev_queue
*queue
= to_netdev_queue(kobj
);
807 if (!attribute
->store
)
810 return attribute
->store(queue
, attribute
, buf
, count
);
813 static const struct sysfs_ops netdev_queue_sysfs_ops
= {
814 .show
= netdev_queue_attr_show
,
815 .store
= netdev_queue_attr_store
,
818 static ssize_t
show_trans_timeout(struct netdev_queue
*queue
,
819 struct netdev_queue_attribute
*attribute
,
822 unsigned long trans_timeout
;
824 spin_lock_irq(&queue
->_xmit_lock
);
825 trans_timeout
= queue
->trans_timeout
;
826 spin_unlock_irq(&queue
->_xmit_lock
);
828 return sprintf(buf
, "%lu", trans_timeout
);
831 static struct netdev_queue_attribute queue_trans_timeout
=
832 __ATTR(tx_timeout
, S_IRUGO
, show_trans_timeout
, NULL
);
836 * Byte queue limits sysfs structures and functions.
838 static ssize_t
bql_show(char *buf
, unsigned int value
)
840 return sprintf(buf
, "%u\n", value
);
843 static ssize_t
bql_set(const char *buf
, const size_t count
,
844 unsigned int *pvalue
)
849 if (!strcmp(buf
, "max") || !strcmp(buf
, "max\n"))
850 value
= DQL_MAX_LIMIT
;
852 err
= kstrtouint(buf
, 10, &value
);
855 if (value
> DQL_MAX_LIMIT
)
864 static ssize_t
bql_show_hold_time(struct netdev_queue
*queue
,
865 struct netdev_queue_attribute
*attr
,
868 struct dql
*dql
= &queue
->dql
;
870 return sprintf(buf
, "%u\n", jiffies_to_msecs(dql
->slack_hold_time
));
873 static ssize_t
bql_set_hold_time(struct netdev_queue
*queue
,
874 struct netdev_queue_attribute
*attribute
,
875 const char *buf
, size_t len
)
877 struct dql
*dql
= &queue
->dql
;
881 err
= kstrtouint(buf
, 10, &value
);
885 dql
->slack_hold_time
= msecs_to_jiffies(value
);
890 static struct netdev_queue_attribute bql_hold_time_attribute
=
891 __ATTR(hold_time
, S_IRUGO
| S_IWUSR
, bql_show_hold_time
,
894 static ssize_t
bql_show_inflight(struct netdev_queue
*queue
,
895 struct netdev_queue_attribute
*attr
,
898 struct dql
*dql
= &queue
->dql
;
900 return sprintf(buf
, "%u\n", dql
->num_queued
- dql
->num_completed
);
903 static struct netdev_queue_attribute bql_inflight_attribute
=
904 __ATTR(inflight
, S_IRUGO
, bql_show_inflight
, NULL
);
906 #define BQL_ATTR(NAME, FIELD) \
907 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
908 struct netdev_queue_attribute *attr, \
911 return bql_show(buf, queue->dql.FIELD); \
914 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
915 struct netdev_queue_attribute *attr, \
916 const char *buf, size_t len) \
918 return bql_set(buf, len, &queue->dql.FIELD); \
921 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \
922 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \
925 BQL_ATTR(limit
, limit
)
926 BQL_ATTR(limit_max
, max_limit
)
927 BQL_ATTR(limit_min
, min_limit
)
929 static struct attribute
*dql_attrs
[] = {
930 &bql_limit_attribute
.attr
,
931 &bql_limit_max_attribute
.attr
,
932 &bql_limit_min_attribute
.attr
,
933 &bql_hold_time_attribute
.attr
,
934 &bql_inflight_attribute
.attr
,
938 static struct attribute_group dql_group
= {
939 .name
= "byte_queue_limits",
942 #endif /* CONFIG_BQL */
945 static inline unsigned int get_netdev_queue_index(struct netdev_queue
*queue
)
947 struct net_device
*dev
= queue
->dev
;
950 for (i
= 0; i
< dev
->num_tx_queues
; i
++)
951 if (queue
== &dev
->_tx
[i
])
954 BUG_ON(i
>= dev
->num_tx_queues
);
960 static ssize_t
show_xps_map(struct netdev_queue
*queue
,
961 struct netdev_queue_attribute
*attribute
, char *buf
)
963 struct net_device
*dev
= queue
->dev
;
964 struct xps_dev_maps
*dev_maps
;
970 if (!zalloc_cpumask_var(&mask
, GFP_KERNEL
))
973 index
= get_netdev_queue_index(queue
);
976 dev_maps
= rcu_dereference(dev
->xps_maps
);
978 for_each_possible_cpu(i
) {
979 struct xps_map
*map
=
980 rcu_dereference(dev_maps
->cpu_map
[i
]);
983 for (j
= 0; j
< map
->len
; j
++) {
984 if (map
->queues
[j
] == index
) {
985 cpumask_set_cpu(i
, mask
);
994 len
+= cpumask_scnprintf(buf
+ len
, PAGE_SIZE
, mask
);
995 if (PAGE_SIZE
- len
< 3) {
996 free_cpumask_var(mask
);
1000 free_cpumask_var(mask
);
1001 len
+= sprintf(buf
+ len
, "\n");
1005 static ssize_t
store_xps_map(struct netdev_queue
*queue
,
1006 struct netdev_queue_attribute
*attribute
,
1007 const char *buf
, size_t len
)
1009 struct net_device
*dev
= queue
->dev
;
1010 unsigned long index
;
1014 if (!capable(CAP_NET_ADMIN
))
1017 if (!alloc_cpumask_var(&mask
, GFP_KERNEL
))
1020 index
= get_netdev_queue_index(queue
);
1022 err
= bitmap_parse(buf
, len
, cpumask_bits(mask
), nr_cpumask_bits
);
1024 free_cpumask_var(mask
);
1028 err
= netif_set_xps_queue(dev
, mask
, index
);
1030 free_cpumask_var(mask
);
1035 static struct netdev_queue_attribute xps_cpus_attribute
=
1036 __ATTR(xps_cpus
, S_IRUGO
| S_IWUSR
, show_xps_map
, store_xps_map
);
1037 #endif /* CONFIG_XPS */
1039 static struct attribute
*netdev_queue_default_attrs
[] = {
1040 &queue_trans_timeout
.attr
,
1042 &xps_cpus_attribute
.attr
,
1047 static void netdev_queue_release(struct kobject
*kobj
)
1049 struct netdev_queue
*queue
= to_netdev_queue(kobj
);
1051 memset(kobj
, 0, sizeof(*kobj
));
1052 dev_put(queue
->dev
);
1055 static struct kobj_type netdev_queue_ktype
= {
1056 .sysfs_ops
= &netdev_queue_sysfs_ops
,
1057 .release
= netdev_queue_release
,
1058 .default_attrs
= netdev_queue_default_attrs
,
1061 static int netdev_queue_add_kobject(struct net_device
*net
, int index
)
1063 struct netdev_queue
*queue
= net
->_tx
+ index
;
1064 struct kobject
*kobj
= &queue
->kobj
;
1067 kobj
->kset
= net
->queues_kset
;
1068 error
= kobject_init_and_add(kobj
, &netdev_queue_ktype
, NULL
,
1074 error
= sysfs_create_group(kobj
, &dql_group
);
1079 kobject_uevent(kobj
, KOBJ_ADD
);
1080 dev_hold(queue
->dev
);
1087 #endif /* CONFIG_SYSFS */
1090 netdev_queue_update_kobjects(struct net_device
*net
, int old_num
, int new_num
)
1096 for (i
= old_num
; i
< new_num
; i
++) {
1097 error
= netdev_queue_add_kobject(net
, i
);
1104 while (--i
>= new_num
) {
1105 struct netdev_queue
*queue
= net
->_tx
+ i
;
1108 sysfs_remove_group(&queue
->kobj
, &dql_group
);
1110 kobject_put(&queue
->kobj
);
1116 #endif /* CONFIG_SYSFS */
1119 static int register_queue_kobjects(struct net_device
*net
)
1121 int error
= 0, txq
= 0, rxq
= 0, real_rx
= 0, real_tx
= 0;
1124 net
->queues_kset
= kset_create_and_add("queues",
1125 NULL
, &net
->dev
.kobj
);
1126 if (!net
->queues_kset
)
1131 real_rx
= net
->real_num_rx_queues
;
1133 real_tx
= net
->real_num_tx_queues
;
1135 error
= net_rx_queue_update_kobjects(net
, 0, real_rx
);
1140 error
= netdev_queue_update_kobjects(net
, 0, real_tx
);
1148 netdev_queue_update_kobjects(net
, txq
, 0);
1149 net_rx_queue_update_kobjects(net
, rxq
, 0);
1153 static void remove_queue_kobjects(struct net_device
*net
)
1155 int real_rx
= 0, real_tx
= 0;
1158 real_rx
= net
->real_num_rx_queues
;
1160 real_tx
= net
->real_num_tx_queues
;
1162 net_rx_queue_update_kobjects(net
, real_rx
, 0);
1163 netdev_queue_update_kobjects(net
, real_tx
, 0);
1165 kset_unregister(net
->queues_kset
);
1169 static void *net_grab_current_ns(void)
1171 struct net
*ns
= current
->nsproxy
->net_ns
;
1172 #ifdef CONFIG_NET_NS
1174 atomic_inc(&ns
->passive
);
1179 static const void *net_initial_ns(void)
1184 static const void *net_netlink_ns(struct sock
*sk
)
1186 return sock_net(sk
);
1189 struct kobj_ns_type_operations net_ns_type_operations
= {
1190 .type
= KOBJ_NS_TYPE_NET
,
1191 .grab_current_ns
= net_grab_current_ns
,
1192 .netlink_ns
= net_netlink_ns
,
1193 .initial_ns
= net_initial_ns
,
1194 .drop_ns
= net_drop_ns
,
1196 EXPORT_SYMBOL_GPL(net_ns_type_operations
);
1198 static int netdev_uevent(struct device
*d
, struct kobj_uevent_env
*env
)
1200 struct net_device
*dev
= to_net_dev(d
);
1203 /* pass interface to uevent. */
1204 retval
= add_uevent_var(env
, "INTERFACE=%s", dev
->name
);
1208 /* pass ifindex to uevent.
1209 * ifindex is useful as it won't change (interface name may change)
1210 * and is what RtNetlink uses natively. */
1211 retval
= add_uevent_var(env
, "IFINDEX=%d", dev
->ifindex
);
1218 * netdev_release -- destroy and free a dead device.
1219 * Called when last reference to device kobject is gone.
1221 static void netdev_release(struct device
*d
)
1223 struct net_device
*dev
= to_net_dev(d
);
1225 BUG_ON(dev
->reg_state
!= NETREG_RELEASED
);
1227 kfree(dev
->ifalias
);
1228 kfree((char *)dev
- dev
->padded
);
1231 static const void *net_namespace(struct device
*d
)
1233 struct net_device
*dev
;
1234 dev
= container_of(d
, struct net_device
, dev
);
1235 return dev_net(dev
);
1238 static struct class net_class
= {
1240 .dev_release
= netdev_release
,
1242 .dev_attrs
= net_class_attributes
,
1243 #endif /* CONFIG_SYSFS */
1244 .dev_uevent
= netdev_uevent
,
1245 .ns_type
= &net_ns_type_operations
,
1246 .namespace = net_namespace
,
1249 /* Delete sysfs entries but hold kobject reference until after all
1250 * netdev references are gone.
1252 void netdev_unregister_kobject(struct net_device
* net
)
1254 struct device
*dev
= &(net
->dev
);
1256 kobject_get(&dev
->kobj
);
1258 remove_queue_kobjects(net
);
1263 /* Create sysfs entries for network device. */
1264 int netdev_register_kobject(struct net_device
*net
)
1266 struct device
*dev
= &(net
->dev
);
1267 const struct attribute_group
**groups
= net
->sysfs_groups
;
1270 device_initialize(dev
);
1271 dev
->class = &net_class
;
1272 dev
->platform_data
= net
;
1273 dev
->groups
= groups
;
1275 dev_set_name(dev
, "%s", net
->name
);
1278 /* Allow for a device specific group */
1282 *groups
++ = &netstat_group
;
1284 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1285 if (net
->ieee80211_ptr
)
1286 *groups
++ = &wireless_group
;
1287 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1288 else if (net
->wireless_handlers
)
1289 *groups
++ = &wireless_group
;
1292 #endif /* CONFIG_SYSFS */
1294 error
= device_add(dev
);
1298 error
= register_queue_kobjects(net
);
1307 int netdev_class_create_file(struct class_attribute
*class_attr
)
1309 return class_create_file(&net_class
, class_attr
);
1311 EXPORT_SYMBOL(netdev_class_create_file
);
1313 void netdev_class_remove_file(struct class_attribute
*class_attr
)
1315 class_remove_file(&net_class
, class_attr
);
1317 EXPORT_SYMBOL(netdev_class_remove_file
);
1319 int netdev_kobject_init(void)
1321 kobj_ns_type_register(&net_ns_type_operations
);
1322 return class_register(&net_class
);