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>
24 #include <linux/pm_runtime.h>
26 #include "net-sysfs.h"
29 static const char fmt_hex
[] = "%#x\n";
30 static const char fmt_long_hex
[] = "%#lx\n";
31 static const char fmt_dec
[] = "%d\n";
32 static const char fmt_udec
[] = "%u\n";
33 static const char fmt_ulong
[] = "%lu\n";
34 static const char fmt_u64
[] = "%llu\n";
36 static inline int dev_isalive(const struct net_device
*dev
)
38 return dev
->reg_state
<= NETREG_REGISTERED
;
41 /* use same locking rules as GIF* ioctl's */
42 static ssize_t
netdev_show(const struct device
*dev
,
43 struct device_attribute
*attr
, char *buf
,
44 ssize_t (*format
)(const struct net_device
*, char *))
46 struct net_device
*net
= to_net_dev(dev
);
47 ssize_t ret
= -EINVAL
;
49 read_lock(&dev_base_lock
);
51 ret
= (*format
)(net
, buf
);
52 read_unlock(&dev_base_lock
);
57 /* generate a show function for simple field */
58 #define NETDEVICE_SHOW(field, format_string) \
59 static ssize_t format_##field(const struct net_device *net, char *buf) \
61 return sprintf(buf, format_string, net->field); \
63 static ssize_t field##_show(struct device *dev, \
64 struct device_attribute *attr, char *buf) \
66 return netdev_show(dev, attr, buf, format_##field); \
69 #define NETDEVICE_SHOW_RO(field, format_string) \
70 NETDEVICE_SHOW(field, format_string); \
71 static DEVICE_ATTR_RO(field)
73 #define NETDEVICE_SHOW_RW(field, format_string) \
74 NETDEVICE_SHOW(field, format_string); \
75 static DEVICE_ATTR_RW(field)
77 /* use same locking and permission rules as SIF* ioctl's */
78 static ssize_t
netdev_store(struct device
*dev
, struct device_attribute
*attr
,
79 const char *buf
, size_t len
,
80 int (*set
)(struct net_device
*, unsigned long))
82 struct net_device
*netdev
= to_net_dev(dev
);
83 struct net
*net
= dev_net(netdev
);
87 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
90 ret
= kstrtoul(buf
, 0, &new);
95 return restart_syscall();
97 if (dev_isalive(netdev
)) {
98 if ((ret
= (*set
)(netdev
, new)) == 0)
106 NETDEVICE_SHOW_RO(dev_id
, fmt_hex
);
107 NETDEVICE_SHOW_RO(dev_port
, fmt_dec
);
108 NETDEVICE_SHOW_RO(addr_assign_type
, fmt_dec
);
109 NETDEVICE_SHOW_RO(addr_len
, fmt_dec
);
110 NETDEVICE_SHOW_RO(iflink
, fmt_dec
);
111 NETDEVICE_SHOW_RO(ifindex
, fmt_dec
);
112 NETDEVICE_SHOW_RO(type
, fmt_dec
);
113 NETDEVICE_SHOW_RO(link_mode
, fmt_dec
);
115 /* use same locking rules as GIFHWADDR ioctl's */
116 static ssize_t
address_show(struct device
*dev
, struct device_attribute
*attr
,
119 struct net_device
*net
= to_net_dev(dev
);
120 ssize_t ret
= -EINVAL
;
122 read_lock(&dev_base_lock
);
123 if (dev_isalive(net
))
124 ret
= sysfs_format_mac(buf
, net
->dev_addr
, net
->addr_len
);
125 read_unlock(&dev_base_lock
);
128 static DEVICE_ATTR_RO(address
);
130 static ssize_t
broadcast_show(struct device
*dev
,
131 struct device_attribute
*attr
, char *buf
)
133 struct net_device
*net
= to_net_dev(dev
);
134 if (dev_isalive(net
))
135 return sysfs_format_mac(buf
, net
->broadcast
, net
->addr_len
);
138 static DEVICE_ATTR_RO(broadcast
);
140 static int change_carrier(struct net_device
*net
, unsigned long new_carrier
)
142 if (!netif_running(net
))
144 return dev_change_carrier(net
, (bool) new_carrier
);
147 static ssize_t
carrier_store(struct device
*dev
, struct device_attribute
*attr
,
148 const char *buf
, size_t len
)
150 return netdev_store(dev
, attr
, buf
, len
, change_carrier
);
153 static ssize_t
carrier_show(struct device
*dev
,
154 struct device_attribute
*attr
, char *buf
)
156 struct net_device
*netdev
= to_net_dev(dev
);
157 if (netif_running(netdev
)) {
158 return sprintf(buf
, fmt_dec
, !!netif_carrier_ok(netdev
));
162 static DEVICE_ATTR_RW(carrier
);
164 static ssize_t
speed_show(struct device
*dev
,
165 struct device_attribute
*attr
, char *buf
)
167 struct net_device
*netdev
= to_net_dev(dev
);
171 return restart_syscall();
173 if (netif_running(netdev
)) {
174 struct ethtool_cmd cmd
;
175 if (!__ethtool_get_settings(netdev
, &cmd
))
176 ret
= sprintf(buf
, fmt_udec
, ethtool_cmd_speed(&cmd
));
181 static DEVICE_ATTR_RO(speed
);
183 static ssize_t
duplex_show(struct device
*dev
,
184 struct device_attribute
*attr
, char *buf
)
186 struct net_device
*netdev
= to_net_dev(dev
);
190 return restart_syscall();
192 if (netif_running(netdev
)) {
193 struct ethtool_cmd cmd
;
194 if (!__ethtool_get_settings(netdev
, &cmd
)) {
196 switch (cmd
.duplex
) {
207 ret
= sprintf(buf
, "%s\n", duplex
);
213 static DEVICE_ATTR_RO(duplex
);
215 static ssize_t
dormant_show(struct device
*dev
,
216 struct device_attribute
*attr
, char *buf
)
218 struct net_device
*netdev
= to_net_dev(dev
);
220 if (netif_running(netdev
))
221 return sprintf(buf
, fmt_dec
, !!netif_dormant(netdev
));
225 static DEVICE_ATTR_RO(dormant
);
227 static const char *const operstates
[] = {
229 "notpresent", /* currently unused */
232 "testing", /* currently unused */
237 static ssize_t
operstate_show(struct device
*dev
,
238 struct device_attribute
*attr
, char *buf
)
240 const struct net_device
*netdev
= to_net_dev(dev
);
241 unsigned char operstate
;
243 read_lock(&dev_base_lock
);
244 operstate
= netdev
->operstate
;
245 if (!netif_running(netdev
))
246 operstate
= IF_OPER_DOWN
;
247 read_unlock(&dev_base_lock
);
249 if (operstate
>= ARRAY_SIZE(operstates
))
250 return -EINVAL
; /* should not happen */
252 return sprintf(buf
, "%s\n", operstates
[operstate
]);
254 static DEVICE_ATTR_RO(operstate
);
256 static ssize_t
carrier_changes_show(struct device
*dev
,
257 struct device_attribute
*attr
,
260 struct net_device
*netdev
= to_net_dev(dev
);
261 return sprintf(buf
, fmt_dec
,
262 atomic_read(&netdev
->carrier_changes
));
264 static DEVICE_ATTR_RO(carrier_changes
);
266 /* read-write attributes */
268 static int change_mtu(struct net_device
*net
, unsigned long new_mtu
)
270 return dev_set_mtu(net
, (int) new_mtu
);
273 static ssize_t
mtu_store(struct device
*dev
, struct device_attribute
*attr
,
274 const char *buf
, size_t len
)
276 return netdev_store(dev
, attr
, buf
, len
, change_mtu
);
278 NETDEVICE_SHOW_RW(mtu
, fmt_dec
);
280 static int change_flags(struct net_device
*net
, unsigned long new_flags
)
282 return dev_change_flags(net
, (unsigned int) new_flags
);
285 static ssize_t
flags_store(struct device
*dev
, struct device_attribute
*attr
,
286 const char *buf
, size_t len
)
288 return netdev_store(dev
, attr
, buf
, len
, change_flags
);
290 NETDEVICE_SHOW_RW(flags
, fmt_hex
);
292 static int change_tx_queue_len(struct net_device
*net
, unsigned long new_len
)
294 net
->tx_queue_len
= new_len
;
298 static ssize_t
tx_queue_len_store(struct device
*dev
,
299 struct device_attribute
*attr
,
300 const char *buf
, size_t len
)
302 if (!capable(CAP_NET_ADMIN
))
305 return netdev_store(dev
, attr
, buf
, len
, change_tx_queue_len
);
307 NETDEVICE_SHOW_RW(tx_queue_len
, fmt_ulong
);
309 static ssize_t
ifalias_store(struct device
*dev
, struct device_attribute
*attr
,
310 const char *buf
, size_t len
)
312 struct net_device
*netdev
= to_net_dev(dev
);
313 struct net
*net
= dev_net(netdev
);
317 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
320 /* ignore trailing newline */
321 if (len
> 0 && buf
[len
- 1] == '\n')
325 return restart_syscall();
326 ret
= dev_set_alias(netdev
, buf
, count
);
329 return ret
< 0 ? ret
: len
;
332 static ssize_t
ifalias_show(struct device
*dev
,
333 struct device_attribute
*attr
, char *buf
)
335 const struct net_device
*netdev
= to_net_dev(dev
);
339 return restart_syscall();
341 ret
= sprintf(buf
, "%s\n", netdev
->ifalias
);
345 static DEVICE_ATTR_RW(ifalias
);
347 static int change_group(struct net_device
*net
, unsigned long new_group
)
349 dev_set_group(net
, (int) new_group
);
353 static ssize_t
group_store(struct device
*dev
, struct device_attribute
*attr
,
354 const char *buf
, size_t len
)
356 return netdev_store(dev
, attr
, buf
, len
, change_group
);
358 NETDEVICE_SHOW(group
, fmt_dec
);
359 static DEVICE_ATTR(netdev_group
, S_IRUGO
| S_IWUSR
, group_show
, group_store
);
361 static ssize_t
phys_port_id_show(struct device
*dev
,
362 struct device_attribute
*attr
, char *buf
)
364 struct net_device
*netdev
= to_net_dev(dev
);
365 ssize_t ret
= -EINVAL
;
368 return restart_syscall();
370 if (dev_isalive(netdev
)) {
371 struct netdev_phys_port_id ppid
;
373 ret
= dev_get_phys_port_id(netdev
, &ppid
);
375 ret
= sprintf(buf
, "%*phN\n", ppid
.id_len
, ppid
.id
);
381 static DEVICE_ATTR_RO(phys_port_id
);
383 static struct attribute
*net_class_attrs
[] = {
384 &dev_attr_netdev_group
.attr
,
386 &dev_attr_dev_id
.attr
,
387 &dev_attr_dev_port
.attr
,
388 &dev_attr_iflink
.attr
,
389 &dev_attr_ifindex
.attr
,
390 &dev_attr_addr_assign_type
.attr
,
391 &dev_attr_addr_len
.attr
,
392 &dev_attr_link_mode
.attr
,
393 &dev_attr_address
.attr
,
394 &dev_attr_broadcast
.attr
,
395 &dev_attr_speed
.attr
,
396 &dev_attr_duplex
.attr
,
397 &dev_attr_dormant
.attr
,
398 &dev_attr_operstate
.attr
,
399 &dev_attr_carrier_changes
.attr
,
400 &dev_attr_ifalias
.attr
,
401 &dev_attr_carrier
.attr
,
403 &dev_attr_flags
.attr
,
404 &dev_attr_tx_queue_len
.attr
,
405 &dev_attr_phys_port_id
.attr
,
408 ATTRIBUTE_GROUPS(net_class
);
410 /* Show a given an attribute in the statistics group */
411 static ssize_t
netstat_show(const struct device
*d
,
412 struct device_attribute
*attr
, char *buf
,
413 unsigned long offset
)
415 struct net_device
*dev
= to_net_dev(d
);
416 ssize_t ret
= -EINVAL
;
418 WARN_ON(offset
> sizeof(struct rtnl_link_stats64
) ||
419 offset
% sizeof(u64
) != 0);
421 read_lock(&dev_base_lock
);
422 if (dev_isalive(dev
)) {
423 struct rtnl_link_stats64 temp
;
424 const struct rtnl_link_stats64
*stats
= dev_get_stats(dev
, &temp
);
426 ret
= sprintf(buf
, fmt_u64
, *(u64
*)(((u8
*) stats
) + offset
));
428 read_unlock(&dev_base_lock
);
432 /* generate a read-only statistics attribute */
433 #define NETSTAT_ENTRY(name) \
434 static ssize_t name##_show(struct device *d, \
435 struct device_attribute *attr, char *buf) \
437 return netstat_show(d, attr, buf, \
438 offsetof(struct rtnl_link_stats64, name)); \
440 static DEVICE_ATTR_RO(name)
442 NETSTAT_ENTRY(rx_packets
);
443 NETSTAT_ENTRY(tx_packets
);
444 NETSTAT_ENTRY(rx_bytes
);
445 NETSTAT_ENTRY(tx_bytes
);
446 NETSTAT_ENTRY(rx_errors
);
447 NETSTAT_ENTRY(tx_errors
);
448 NETSTAT_ENTRY(rx_dropped
);
449 NETSTAT_ENTRY(tx_dropped
);
450 NETSTAT_ENTRY(multicast
);
451 NETSTAT_ENTRY(collisions
);
452 NETSTAT_ENTRY(rx_length_errors
);
453 NETSTAT_ENTRY(rx_over_errors
);
454 NETSTAT_ENTRY(rx_crc_errors
);
455 NETSTAT_ENTRY(rx_frame_errors
);
456 NETSTAT_ENTRY(rx_fifo_errors
);
457 NETSTAT_ENTRY(rx_missed_errors
);
458 NETSTAT_ENTRY(tx_aborted_errors
);
459 NETSTAT_ENTRY(tx_carrier_errors
);
460 NETSTAT_ENTRY(tx_fifo_errors
);
461 NETSTAT_ENTRY(tx_heartbeat_errors
);
462 NETSTAT_ENTRY(tx_window_errors
);
463 NETSTAT_ENTRY(rx_compressed
);
464 NETSTAT_ENTRY(tx_compressed
);
466 static struct attribute
*netstat_attrs
[] = {
467 &dev_attr_rx_packets
.attr
,
468 &dev_attr_tx_packets
.attr
,
469 &dev_attr_rx_bytes
.attr
,
470 &dev_attr_tx_bytes
.attr
,
471 &dev_attr_rx_errors
.attr
,
472 &dev_attr_tx_errors
.attr
,
473 &dev_attr_rx_dropped
.attr
,
474 &dev_attr_tx_dropped
.attr
,
475 &dev_attr_multicast
.attr
,
476 &dev_attr_collisions
.attr
,
477 &dev_attr_rx_length_errors
.attr
,
478 &dev_attr_rx_over_errors
.attr
,
479 &dev_attr_rx_crc_errors
.attr
,
480 &dev_attr_rx_frame_errors
.attr
,
481 &dev_attr_rx_fifo_errors
.attr
,
482 &dev_attr_rx_missed_errors
.attr
,
483 &dev_attr_tx_aborted_errors
.attr
,
484 &dev_attr_tx_carrier_errors
.attr
,
485 &dev_attr_tx_fifo_errors
.attr
,
486 &dev_attr_tx_heartbeat_errors
.attr
,
487 &dev_attr_tx_window_errors
.attr
,
488 &dev_attr_rx_compressed
.attr
,
489 &dev_attr_tx_compressed
.attr
,
494 static struct attribute_group netstat_group
= {
495 .name
= "statistics",
496 .attrs
= netstat_attrs
,
499 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
500 static struct attribute
*wireless_attrs
[] = {
504 static struct attribute_group wireless_group
= {
506 .attrs
= wireless_attrs
,
510 #else /* CONFIG_SYSFS */
511 #define net_class_groups NULL
512 #endif /* CONFIG_SYSFS */
515 #define to_rx_queue_attr(_attr) container_of(_attr, \
516 struct rx_queue_attribute, attr)
518 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
520 static ssize_t
rx_queue_attr_show(struct kobject
*kobj
, struct attribute
*attr
,
523 struct rx_queue_attribute
*attribute
= to_rx_queue_attr(attr
);
524 struct netdev_rx_queue
*queue
= to_rx_queue(kobj
);
526 if (!attribute
->show
)
529 return attribute
->show(queue
, attribute
, buf
);
532 static ssize_t
rx_queue_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
533 const char *buf
, size_t count
)
535 struct rx_queue_attribute
*attribute
= to_rx_queue_attr(attr
);
536 struct netdev_rx_queue
*queue
= to_rx_queue(kobj
);
538 if (!attribute
->store
)
541 return attribute
->store(queue
, attribute
, buf
, count
);
544 static const struct sysfs_ops rx_queue_sysfs_ops
= {
545 .show
= rx_queue_attr_show
,
546 .store
= rx_queue_attr_store
,
550 static ssize_t
show_rps_map(struct netdev_rx_queue
*queue
,
551 struct rx_queue_attribute
*attribute
, char *buf
)
558 if (!zalloc_cpumask_var(&mask
, GFP_KERNEL
))
562 map
= rcu_dereference(queue
->rps_map
);
564 for (i
= 0; i
< map
->len
; i
++)
565 cpumask_set_cpu(map
->cpus
[i
], mask
);
567 len
+= cpumask_scnprintf(buf
+ len
, PAGE_SIZE
, mask
);
568 if (PAGE_SIZE
- len
< 3) {
570 free_cpumask_var(mask
);
575 free_cpumask_var(mask
);
576 len
+= sprintf(buf
+ len
, "\n");
580 static ssize_t
store_rps_map(struct netdev_rx_queue
*queue
,
581 struct rx_queue_attribute
*attribute
,
582 const char *buf
, size_t len
)
584 struct rps_map
*old_map
, *map
;
587 static DEFINE_SPINLOCK(rps_map_lock
);
589 if (!capable(CAP_NET_ADMIN
))
592 if (!alloc_cpumask_var(&mask
, GFP_KERNEL
))
595 err
= bitmap_parse(buf
, len
, cpumask_bits(mask
), nr_cpumask_bits
);
597 free_cpumask_var(mask
);
601 map
= kzalloc(max_t(unsigned int,
602 RPS_MAP_SIZE(cpumask_weight(mask
)), L1_CACHE_BYTES
),
605 free_cpumask_var(mask
);
610 for_each_cpu_and(cpu
, mask
, cpu_online_mask
)
611 map
->cpus
[i
++] = cpu
;
620 spin_lock(&rps_map_lock
);
621 old_map
= rcu_dereference_protected(queue
->rps_map
,
622 lockdep_is_held(&rps_map_lock
));
623 rcu_assign_pointer(queue
->rps_map
, map
);
624 spin_unlock(&rps_map_lock
);
627 static_key_slow_inc(&rps_needed
);
629 kfree_rcu(old_map
, rcu
);
630 static_key_slow_dec(&rps_needed
);
632 free_cpumask_var(mask
);
636 static ssize_t
show_rps_dev_flow_table_cnt(struct netdev_rx_queue
*queue
,
637 struct rx_queue_attribute
*attr
,
640 struct rps_dev_flow_table
*flow_table
;
641 unsigned long val
= 0;
644 flow_table
= rcu_dereference(queue
->rps_flow_table
);
646 val
= (unsigned long)flow_table
->mask
+ 1;
649 return sprintf(buf
, "%lu\n", val
);
652 static void rps_dev_flow_table_release(struct rcu_head
*rcu
)
654 struct rps_dev_flow_table
*table
= container_of(rcu
,
655 struct rps_dev_flow_table
, rcu
);
659 static ssize_t
store_rps_dev_flow_table_cnt(struct netdev_rx_queue
*queue
,
660 struct rx_queue_attribute
*attr
,
661 const char *buf
, size_t len
)
663 unsigned long mask
, count
;
664 struct rps_dev_flow_table
*table
, *old_table
;
665 static DEFINE_SPINLOCK(rps_dev_flow_lock
);
668 if (!capable(CAP_NET_ADMIN
))
671 rc
= kstrtoul(buf
, 0, &count
);
677 /* mask = roundup_pow_of_two(count) - 1;
678 * without overflows...
680 while ((mask
| (mask
>> 1)) != mask
)
682 /* On 64 bit arches, must check mask fits in table->mask (u32),
683 * and on 32bit arches, must check
684 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
686 #if BITS_PER_LONG > 32
687 if (mask
> (unsigned long)(u32
)mask
)
690 if (mask
> (ULONG_MAX
- RPS_DEV_FLOW_TABLE_SIZE(1))
691 / sizeof(struct rps_dev_flow
)) {
692 /* Enforce a limit to prevent overflow */
696 table
= vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask
+ 1));
701 for (count
= 0; count
<= mask
; count
++)
702 table
->flows
[count
].cpu
= RPS_NO_CPU
;
706 spin_lock(&rps_dev_flow_lock
);
707 old_table
= rcu_dereference_protected(queue
->rps_flow_table
,
708 lockdep_is_held(&rps_dev_flow_lock
));
709 rcu_assign_pointer(queue
->rps_flow_table
, table
);
710 spin_unlock(&rps_dev_flow_lock
);
713 call_rcu(&old_table
->rcu
, rps_dev_flow_table_release
);
718 static struct rx_queue_attribute rps_cpus_attribute
=
719 __ATTR(rps_cpus
, S_IRUGO
| S_IWUSR
, show_rps_map
, store_rps_map
);
722 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute
=
723 __ATTR(rps_flow_cnt
, S_IRUGO
| S_IWUSR
,
724 show_rps_dev_flow_table_cnt
, store_rps_dev_flow_table_cnt
);
725 #endif /* CONFIG_RPS */
727 static struct attribute
*rx_queue_default_attrs
[] = {
729 &rps_cpus_attribute
.attr
,
730 &rps_dev_flow_table_cnt_attribute
.attr
,
735 static void rx_queue_release(struct kobject
*kobj
)
737 struct netdev_rx_queue
*queue
= to_rx_queue(kobj
);
740 struct rps_dev_flow_table
*flow_table
;
743 map
= rcu_dereference_protected(queue
->rps_map
, 1);
745 RCU_INIT_POINTER(queue
->rps_map
, NULL
);
749 flow_table
= rcu_dereference_protected(queue
->rps_flow_table
, 1);
751 RCU_INIT_POINTER(queue
->rps_flow_table
, NULL
);
752 call_rcu(&flow_table
->rcu
, rps_dev_flow_table_release
);
756 memset(kobj
, 0, sizeof(*kobj
));
760 static const void *rx_queue_namespace(struct kobject
*kobj
)
762 struct netdev_rx_queue
*queue
= to_rx_queue(kobj
);
763 struct device
*dev
= &queue
->dev
->dev
;
764 const void *ns
= NULL
;
766 if (dev
->class && dev
->class->ns_type
)
767 ns
= dev
->class->namespace(dev
);
772 static struct kobj_type rx_queue_ktype
= {
773 .sysfs_ops
= &rx_queue_sysfs_ops
,
774 .release
= rx_queue_release
,
775 .default_attrs
= rx_queue_default_attrs
,
776 .namespace = rx_queue_namespace
779 static int rx_queue_add_kobject(struct net_device
*net
, int index
)
781 struct netdev_rx_queue
*queue
= net
->_rx
+ index
;
782 struct kobject
*kobj
= &queue
->kobj
;
785 kobj
->kset
= net
->queues_kset
;
786 error
= kobject_init_and_add(kobj
, &rx_queue_ktype
, NULL
,
791 if (net
->sysfs_rx_queue_group
) {
792 error
= sysfs_create_group(kobj
, net
->sysfs_rx_queue_group
);
797 kobject_uevent(kobj
, KOBJ_ADD
);
798 dev_hold(queue
->dev
);
805 #endif /* CONFIG_SYSFS */
808 net_rx_queue_update_kobjects(struct net_device
*net
, int old_num
, int new_num
)
815 if (!net
->sysfs_rx_queue_group
)
818 for (i
= old_num
; i
< new_num
; i
++) {
819 error
= rx_queue_add_kobject(net
, i
);
826 while (--i
>= new_num
) {
827 if (net
->sysfs_rx_queue_group
)
828 sysfs_remove_group(&net
->_rx
[i
].kobj
,
829 net
->sysfs_rx_queue_group
);
830 kobject_put(&net
->_rx
[i
].kobj
);
841 * netdev_queue sysfs structures and functions.
843 struct netdev_queue_attribute
{
844 struct attribute attr
;
845 ssize_t (*show
)(struct netdev_queue
*queue
,
846 struct netdev_queue_attribute
*attr
, char *buf
);
847 ssize_t (*store
)(struct netdev_queue
*queue
,
848 struct netdev_queue_attribute
*attr
, const char *buf
, size_t len
);
850 #define to_netdev_queue_attr(_attr) container_of(_attr, \
851 struct netdev_queue_attribute, attr)
853 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
855 static ssize_t
netdev_queue_attr_show(struct kobject
*kobj
,
856 struct attribute
*attr
, char *buf
)
858 struct netdev_queue_attribute
*attribute
= to_netdev_queue_attr(attr
);
859 struct netdev_queue
*queue
= to_netdev_queue(kobj
);
861 if (!attribute
->show
)
864 return attribute
->show(queue
, attribute
, buf
);
867 static ssize_t
netdev_queue_attr_store(struct kobject
*kobj
,
868 struct attribute
*attr
,
869 const char *buf
, size_t count
)
871 struct netdev_queue_attribute
*attribute
= to_netdev_queue_attr(attr
);
872 struct netdev_queue
*queue
= to_netdev_queue(kobj
);
874 if (!attribute
->store
)
877 return attribute
->store(queue
, attribute
, buf
, count
);
880 static const struct sysfs_ops netdev_queue_sysfs_ops
= {
881 .show
= netdev_queue_attr_show
,
882 .store
= netdev_queue_attr_store
,
885 static ssize_t
show_trans_timeout(struct netdev_queue
*queue
,
886 struct netdev_queue_attribute
*attribute
,
889 unsigned long trans_timeout
;
891 spin_lock_irq(&queue
->_xmit_lock
);
892 trans_timeout
= queue
->trans_timeout
;
893 spin_unlock_irq(&queue
->_xmit_lock
);
895 return sprintf(buf
, "%lu", trans_timeout
);
898 static struct netdev_queue_attribute queue_trans_timeout
=
899 __ATTR(tx_timeout
, S_IRUGO
, show_trans_timeout
, NULL
);
903 * Byte queue limits sysfs structures and functions.
905 static ssize_t
bql_show(char *buf
, unsigned int value
)
907 return sprintf(buf
, "%u\n", value
);
910 static ssize_t
bql_set(const char *buf
, const size_t count
,
911 unsigned int *pvalue
)
916 if (!strcmp(buf
, "max") || !strcmp(buf
, "max\n"))
917 value
= DQL_MAX_LIMIT
;
919 err
= kstrtouint(buf
, 10, &value
);
922 if (value
> DQL_MAX_LIMIT
)
931 static ssize_t
bql_show_hold_time(struct netdev_queue
*queue
,
932 struct netdev_queue_attribute
*attr
,
935 struct dql
*dql
= &queue
->dql
;
937 return sprintf(buf
, "%u\n", jiffies_to_msecs(dql
->slack_hold_time
));
940 static ssize_t
bql_set_hold_time(struct netdev_queue
*queue
,
941 struct netdev_queue_attribute
*attribute
,
942 const char *buf
, size_t len
)
944 struct dql
*dql
= &queue
->dql
;
948 err
= kstrtouint(buf
, 10, &value
);
952 dql
->slack_hold_time
= msecs_to_jiffies(value
);
957 static struct netdev_queue_attribute bql_hold_time_attribute
=
958 __ATTR(hold_time
, S_IRUGO
| S_IWUSR
, bql_show_hold_time
,
961 static ssize_t
bql_show_inflight(struct netdev_queue
*queue
,
962 struct netdev_queue_attribute
*attr
,
965 struct dql
*dql
= &queue
->dql
;
967 return sprintf(buf
, "%u\n", dql
->num_queued
- dql
->num_completed
);
970 static struct netdev_queue_attribute bql_inflight_attribute
=
971 __ATTR(inflight
, S_IRUGO
, bql_show_inflight
, NULL
);
973 #define BQL_ATTR(NAME, FIELD) \
974 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
975 struct netdev_queue_attribute *attr, \
978 return bql_show(buf, queue->dql.FIELD); \
981 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
982 struct netdev_queue_attribute *attr, \
983 const char *buf, size_t len) \
985 return bql_set(buf, len, &queue->dql.FIELD); \
988 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \
989 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \
992 BQL_ATTR(limit
, limit
)
993 BQL_ATTR(limit_max
, max_limit
)
994 BQL_ATTR(limit_min
, min_limit
)
996 static struct attribute
*dql_attrs
[] = {
997 &bql_limit_attribute
.attr
,
998 &bql_limit_max_attribute
.attr
,
999 &bql_limit_min_attribute
.attr
,
1000 &bql_hold_time_attribute
.attr
,
1001 &bql_inflight_attribute
.attr
,
1005 static struct attribute_group dql_group
= {
1006 .name
= "byte_queue_limits",
1009 #endif /* CONFIG_BQL */
1012 static unsigned int get_netdev_queue_index(struct netdev_queue
*queue
)
1014 struct net_device
*dev
= queue
->dev
;
1017 i
= queue
- dev
->_tx
;
1018 BUG_ON(i
>= dev
->num_tx_queues
);
1024 static ssize_t
show_xps_map(struct netdev_queue
*queue
,
1025 struct netdev_queue_attribute
*attribute
, char *buf
)
1027 struct net_device
*dev
= queue
->dev
;
1028 struct xps_dev_maps
*dev_maps
;
1030 unsigned long index
;
1034 if (!zalloc_cpumask_var(&mask
, GFP_KERNEL
))
1037 index
= get_netdev_queue_index(queue
);
1040 dev_maps
= rcu_dereference(dev
->xps_maps
);
1042 for_each_possible_cpu(i
) {
1043 struct xps_map
*map
=
1044 rcu_dereference(dev_maps
->cpu_map
[i
]);
1047 for (j
= 0; j
< map
->len
; j
++) {
1048 if (map
->queues
[j
] == index
) {
1049 cpumask_set_cpu(i
, mask
);
1058 len
+= cpumask_scnprintf(buf
+ len
, PAGE_SIZE
, mask
);
1059 if (PAGE_SIZE
- len
< 3) {
1060 free_cpumask_var(mask
);
1064 free_cpumask_var(mask
);
1065 len
+= sprintf(buf
+ len
, "\n");
1069 static ssize_t
store_xps_map(struct netdev_queue
*queue
,
1070 struct netdev_queue_attribute
*attribute
,
1071 const char *buf
, size_t len
)
1073 struct net_device
*dev
= queue
->dev
;
1074 unsigned long index
;
1078 if (!capable(CAP_NET_ADMIN
))
1081 if (!alloc_cpumask_var(&mask
, GFP_KERNEL
))
1084 index
= get_netdev_queue_index(queue
);
1086 err
= bitmap_parse(buf
, len
, cpumask_bits(mask
), nr_cpumask_bits
);
1088 free_cpumask_var(mask
);
1092 err
= netif_set_xps_queue(dev
, mask
, index
);
1094 free_cpumask_var(mask
);
1099 static struct netdev_queue_attribute xps_cpus_attribute
=
1100 __ATTR(xps_cpus
, S_IRUGO
| S_IWUSR
, show_xps_map
, store_xps_map
);
1101 #endif /* CONFIG_XPS */
1103 static struct attribute
*netdev_queue_default_attrs
[] = {
1104 &queue_trans_timeout
.attr
,
1106 &xps_cpus_attribute
.attr
,
1111 static void netdev_queue_release(struct kobject
*kobj
)
1113 struct netdev_queue
*queue
= to_netdev_queue(kobj
);
1115 memset(kobj
, 0, sizeof(*kobj
));
1116 dev_put(queue
->dev
);
1119 static const void *netdev_queue_namespace(struct kobject
*kobj
)
1121 struct netdev_queue
*queue
= to_netdev_queue(kobj
);
1122 struct device
*dev
= &queue
->dev
->dev
;
1123 const void *ns
= NULL
;
1125 if (dev
->class && dev
->class->ns_type
)
1126 ns
= dev
->class->namespace(dev
);
1131 static struct kobj_type netdev_queue_ktype
= {
1132 .sysfs_ops
= &netdev_queue_sysfs_ops
,
1133 .release
= netdev_queue_release
,
1134 .default_attrs
= netdev_queue_default_attrs
,
1135 .namespace = netdev_queue_namespace
,
1138 static int netdev_queue_add_kobject(struct net_device
*net
, int index
)
1140 struct netdev_queue
*queue
= net
->_tx
+ index
;
1141 struct kobject
*kobj
= &queue
->kobj
;
1144 kobj
->kset
= net
->queues_kset
;
1145 error
= kobject_init_and_add(kobj
, &netdev_queue_ktype
, NULL
,
1151 error
= sysfs_create_group(kobj
, &dql_group
);
1156 kobject_uevent(kobj
, KOBJ_ADD
);
1157 dev_hold(queue
->dev
);
1164 #endif /* CONFIG_SYSFS */
1167 netdev_queue_update_kobjects(struct net_device
*net
, int old_num
, int new_num
)
1173 for (i
= old_num
; i
< new_num
; i
++) {
1174 error
= netdev_queue_add_kobject(net
, i
);
1181 while (--i
>= new_num
) {
1182 struct netdev_queue
*queue
= net
->_tx
+ i
;
1185 sysfs_remove_group(&queue
->kobj
, &dql_group
);
1187 kobject_put(&queue
->kobj
);
1193 #endif /* CONFIG_SYSFS */
1196 static int register_queue_kobjects(struct net_device
*net
)
1198 int error
= 0, txq
= 0, rxq
= 0, real_rx
= 0, real_tx
= 0;
1201 net
->queues_kset
= kset_create_and_add("queues",
1202 NULL
, &net
->dev
.kobj
);
1203 if (!net
->queues_kset
)
1205 real_rx
= net
->real_num_rx_queues
;
1207 real_tx
= net
->real_num_tx_queues
;
1209 error
= net_rx_queue_update_kobjects(net
, 0, real_rx
);
1214 error
= netdev_queue_update_kobjects(net
, 0, real_tx
);
1222 netdev_queue_update_kobjects(net
, txq
, 0);
1223 net_rx_queue_update_kobjects(net
, rxq
, 0);
1227 static void remove_queue_kobjects(struct net_device
*net
)
1229 int real_rx
= 0, real_tx
= 0;
1232 real_rx
= net
->real_num_rx_queues
;
1234 real_tx
= net
->real_num_tx_queues
;
1236 net_rx_queue_update_kobjects(net
, real_rx
, 0);
1237 netdev_queue_update_kobjects(net
, real_tx
, 0);
1239 kset_unregister(net
->queues_kset
);
1243 static bool net_current_may_mount(void)
1245 struct net
*net
= current
->nsproxy
->net_ns
;
1247 return ns_capable(net
->user_ns
, CAP_SYS_ADMIN
);
1250 static void *net_grab_current_ns(void)
1252 struct net
*ns
= current
->nsproxy
->net_ns
;
1253 #ifdef CONFIG_NET_NS
1255 atomic_inc(&ns
->passive
);
1260 static const void *net_initial_ns(void)
1265 static const void *net_netlink_ns(struct sock
*sk
)
1267 return sock_net(sk
);
1270 struct kobj_ns_type_operations net_ns_type_operations
= {
1271 .type
= KOBJ_NS_TYPE_NET
,
1272 .current_may_mount
= net_current_may_mount
,
1273 .grab_current_ns
= net_grab_current_ns
,
1274 .netlink_ns
= net_netlink_ns
,
1275 .initial_ns
= net_initial_ns
,
1276 .drop_ns
= net_drop_ns
,
1278 EXPORT_SYMBOL_GPL(net_ns_type_operations
);
1280 static int netdev_uevent(struct device
*d
, struct kobj_uevent_env
*env
)
1282 struct net_device
*dev
= to_net_dev(d
);
1285 /* pass interface to uevent. */
1286 retval
= add_uevent_var(env
, "INTERFACE=%s", dev
->name
);
1290 /* pass ifindex to uevent.
1291 * ifindex is useful as it won't change (interface name may change)
1292 * and is what RtNetlink uses natively. */
1293 retval
= add_uevent_var(env
, "IFINDEX=%d", dev
->ifindex
);
1300 * netdev_release -- destroy and free a dead device.
1301 * Called when last reference to device kobject is gone.
1303 static void netdev_release(struct device
*d
)
1305 struct net_device
*dev
= to_net_dev(d
);
1307 BUG_ON(dev
->reg_state
!= NETREG_RELEASED
);
1309 kfree(dev
->ifalias
);
1310 netdev_freemem(dev
);
1313 static const void *net_namespace(struct device
*d
)
1315 struct net_device
*dev
;
1316 dev
= container_of(d
, struct net_device
, dev
);
1317 return dev_net(dev
);
1320 static struct class net_class
= {
1322 .dev_release
= netdev_release
,
1323 .dev_groups
= net_class_groups
,
1324 .dev_uevent
= netdev_uevent
,
1325 .ns_type
= &net_ns_type_operations
,
1326 .namespace = net_namespace
,
1329 /* Delete sysfs entries but hold kobject reference until after all
1330 * netdev references are gone.
1332 void netdev_unregister_kobject(struct net_device
* net
)
1334 struct device
*dev
= &(net
->dev
);
1336 kobject_get(&dev
->kobj
);
1338 remove_queue_kobjects(net
);
1340 pm_runtime_set_memalloc_noio(dev
, false);
1345 /* Create sysfs entries for network device. */
1346 int netdev_register_kobject(struct net_device
*net
)
1348 struct device
*dev
= &(net
->dev
);
1349 const struct attribute_group
**groups
= net
->sysfs_groups
;
1352 device_initialize(dev
);
1353 dev
->class = &net_class
;
1354 dev
->platform_data
= net
;
1355 dev
->groups
= groups
;
1357 dev_set_name(dev
, "%s", net
->name
);
1360 /* Allow for a device specific group */
1364 *groups
++ = &netstat_group
;
1366 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1367 if (net
->ieee80211_ptr
)
1368 *groups
++ = &wireless_group
;
1369 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1370 else if (net
->wireless_handlers
)
1371 *groups
++ = &wireless_group
;
1374 #endif /* CONFIG_SYSFS */
1376 error
= device_add(dev
);
1380 error
= register_queue_kobjects(net
);
1386 pm_runtime_set_memalloc_noio(dev
, true);
1391 int netdev_class_create_file_ns(struct class_attribute
*class_attr
,
1394 return class_create_file_ns(&net_class
, class_attr
, ns
);
1396 EXPORT_SYMBOL(netdev_class_create_file_ns
);
1398 void netdev_class_remove_file_ns(struct class_attribute
*class_attr
,
1401 class_remove_file_ns(&net_class
, class_attr
, ns
);
1403 EXPORT_SYMBOL(netdev_class_remove_file_ns
);
1405 int __init
netdev_kobject_init(void)
1407 kobj_ns_type_register(&net_ns_type_operations
);
1408 return class_register(&net_class
);