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 <net/switchdev.h>
16 #include <linux/if_arp.h>
17 #include <linux/slab.h>
18 #include <linux/nsproxy.h>
20 #include <net/net_namespace.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/vmalloc.h>
23 #include <linux/export.h>
24 #include <linux/jiffies.h>
25 #include <linux/pm_runtime.h>
27 #include <linux/of_net.h>
29 #include "net-sysfs.h"
32 static const char fmt_hex
[] = "%#x\n";
33 static const char fmt_dec
[] = "%d\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
*ndev
= to_net_dev(dev
);
48 ssize_t ret
= -EINVAL
;
50 read_lock(&dev_base_lock
);
51 if (dev_isalive(ndev
))
52 ret
= (*format
)(ndev
, 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 *dev, char *buf) \
62 return sprintf(buf, format_string, dev->field); \
64 static ssize_t field##_show(struct device *dev, \
65 struct device_attribute *attr, char *buf) \
67 return netdev_show(dev, attr, buf, format_##field); \
70 #define NETDEVICE_SHOW_RO(field, format_string) \
71 NETDEVICE_SHOW(field, format_string); \
72 static DEVICE_ATTR_RO(field)
74 #define NETDEVICE_SHOW_RW(field, format_string) \
75 NETDEVICE_SHOW(field, format_string); \
76 static DEVICE_ATTR_RW(field)
78 /* use same locking and permission rules as SIF* ioctl's */
79 static ssize_t
netdev_store(struct device
*dev
, struct device_attribute
*attr
,
80 const char *buf
, size_t len
,
81 int (*set
)(struct net_device
*, unsigned long))
83 struct net_device
*netdev
= to_net_dev(dev
);
84 struct net
*net
= dev_net(netdev
);
88 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
91 ret
= kstrtoul(buf
, 0, &new);
96 return restart_syscall();
98 if (dev_isalive(netdev
)) {
99 if ((ret
= (*set
)(netdev
, new)) == 0)
107 NETDEVICE_SHOW_RO(dev_id
, fmt_hex
);
108 NETDEVICE_SHOW_RO(dev_port
, fmt_dec
);
109 NETDEVICE_SHOW_RO(addr_assign_type
, fmt_dec
);
110 NETDEVICE_SHOW_RO(addr_len
, 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 static ssize_t
iflink_show(struct device
*dev
, struct device_attribute
*attr
,
118 struct net_device
*ndev
= to_net_dev(dev
);
120 return sprintf(buf
, fmt_dec
, dev_get_iflink(ndev
));
122 static DEVICE_ATTR_RO(iflink
);
124 static ssize_t
format_name_assign_type(const struct net_device
*dev
, char *buf
)
126 return sprintf(buf
, fmt_dec
, dev
->name_assign_type
);
129 static ssize_t
name_assign_type_show(struct device
*dev
,
130 struct device_attribute
*attr
,
133 struct net_device
*ndev
= to_net_dev(dev
);
134 ssize_t ret
= -EINVAL
;
136 if (ndev
->name_assign_type
!= NET_NAME_UNKNOWN
)
137 ret
= netdev_show(dev
, attr
, buf
, format_name_assign_type
);
141 static DEVICE_ATTR_RO(name_assign_type
);
143 /* use same locking rules as GIFHWADDR ioctl's */
144 static ssize_t
address_show(struct device
*dev
, struct device_attribute
*attr
,
147 struct net_device
*ndev
= to_net_dev(dev
);
148 ssize_t ret
= -EINVAL
;
150 read_lock(&dev_base_lock
);
151 if (dev_isalive(ndev
))
152 ret
= sysfs_format_mac(buf
, ndev
->dev_addr
, ndev
->addr_len
);
153 read_unlock(&dev_base_lock
);
156 static DEVICE_ATTR_RO(address
);
158 static ssize_t
broadcast_show(struct device
*dev
,
159 struct device_attribute
*attr
, char *buf
)
161 struct net_device
*ndev
= to_net_dev(dev
);
162 if (dev_isalive(ndev
))
163 return sysfs_format_mac(buf
, ndev
->broadcast
, ndev
->addr_len
);
166 static DEVICE_ATTR_RO(broadcast
);
168 static int change_carrier(struct net_device
*dev
, unsigned long new_carrier
)
170 if (!netif_running(dev
))
172 return dev_change_carrier(dev
, (bool) new_carrier
);
175 static ssize_t
carrier_store(struct device
*dev
, struct device_attribute
*attr
,
176 const char *buf
, size_t len
)
178 return netdev_store(dev
, attr
, buf
, len
, change_carrier
);
181 static ssize_t
carrier_show(struct device
*dev
,
182 struct device_attribute
*attr
, char *buf
)
184 struct net_device
*netdev
= to_net_dev(dev
);
185 if (netif_running(netdev
)) {
186 return sprintf(buf
, fmt_dec
, !!netif_carrier_ok(netdev
));
190 static DEVICE_ATTR_RW(carrier
);
192 static ssize_t
speed_show(struct device
*dev
,
193 struct device_attribute
*attr
, char *buf
)
195 struct net_device
*netdev
= to_net_dev(dev
);
199 return restart_syscall();
201 if (netif_running(netdev
)) {
202 struct ethtool_link_ksettings cmd
;
204 if (!__ethtool_get_link_ksettings(netdev
, &cmd
))
205 ret
= sprintf(buf
, fmt_dec
, cmd
.base
.speed
);
210 static DEVICE_ATTR_RO(speed
);
212 static ssize_t
duplex_show(struct device
*dev
,
213 struct device_attribute
*attr
, char *buf
)
215 struct net_device
*netdev
= to_net_dev(dev
);
219 return restart_syscall();
221 if (netif_running(netdev
)) {
222 struct ethtool_link_ksettings cmd
;
224 if (!__ethtool_get_link_ksettings(netdev
, &cmd
)) {
227 switch (cmd
.base
.duplex
) {
238 ret
= sprintf(buf
, "%s\n", duplex
);
244 static DEVICE_ATTR_RO(duplex
);
246 static ssize_t
dormant_show(struct device
*dev
,
247 struct device_attribute
*attr
, char *buf
)
249 struct net_device
*netdev
= to_net_dev(dev
);
251 if (netif_running(netdev
))
252 return sprintf(buf
, fmt_dec
, !!netif_dormant(netdev
));
256 static DEVICE_ATTR_RO(dormant
);
258 static const char *const operstates
[] = {
260 "notpresent", /* currently unused */
263 "testing", /* currently unused */
268 static ssize_t
operstate_show(struct device
*dev
,
269 struct device_attribute
*attr
, char *buf
)
271 const struct net_device
*netdev
= to_net_dev(dev
);
272 unsigned char operstate
;
274 read_lock(&dev_base_lock
);
275 operstate
= netdev
->operstate
;
276 if (!netif_running(netdev
))
277 operstate
= IF_OPER_DOWN
;
278 read_unlock(&dev_base_lock
);
280 if (operstate
>= ARRAY_SIZE(operstates
))
281 return -EINVAL
; /* should not happen */
283 return sprintf(buf
, "%s\n", operstates
[operstate
]);
285 static DEVICE_ATTR_RO(operstate
);
287 static ssize_t
carrier_changes_show(struct device
*dev
,
288 struct device_attribute
*attr
,
291 struct net_device
*netdev
= to_net_dev(dev
);
292 return sprintf(buf
, fmt_dec
,
293 atomic_read(&netdev
->carrier_changes
));
295 static DEVICE_ATTR_RO(carrier_changes
);
297 /* read-write attributes */
299 static int change_mtu(struct net_device
*dev
, unsigned long new_mtu
)
301 return dev_set_mtu(dev
, (int) new_mtu
);
304 static ssize_t
mtu_store(struct device
*dev
, struct device_attribute
*attr
,
305 const char *buf
, size_t len
)
307 return netdev_store(dev
, attr
, buf
, len
, change_mtu
);
309 NETDEVICE_SHOW_RW(mtu
, fmt_dec
);
311 static int change_flags(struct net_device
*dev
, unsigned long new_flags
)
313 return dev_change_flags(dev
, (unsigned int) new_flags
);
316 static ssize_t
flags_store(struct device
*dev
, struct device_attribute
*attr
,
317 const char *buf
, size_t len
)
319 return netdev_store(dev
, attr
, buf
, len
, change_flags
);
321 NETDEVICE_SHOW_RW(flags
, fmt_hex
);
323 static int change_tx_queue_len(struct net_device
*dev
, unsigned long new_len
)
325 dev
->tx_queue_len
= new_len
;
329 static ssize_t
tx_queue_len_store(struct device
*dev
,
330 struct device_attribute
*attr
,
331 const char *buf
, size_t len
)
333 if (!capable(CAP_NET_ADMIN
))
336 return netdev_store(dev
, attr
, buf
, len
, change_tx_queue_len
);
338 NETDEVICE_SHOW_RW(tx_queue_len
, fmt_ulong
);
340 static int change_gro_flush_timeout(struct net_device
*dev
, unsigned long val
)
342 dev
->gro_flush_timeout
= val
;
346 static ssize_t
gro_flush_timeout_store(struct device
*dev
,
347 struct device_attribute
*attr
,
348 const char *buf
, size_t len
)
350 if (!capable(CAP_NET_ADMIN
))
353 return netdev_store(dev
, attr
, buf
, len
, change_gro_flush_timeout
);
355 NETDEVICE_SHOW_RW(gro_flush_timeout
, fmt_ulong
);
357 static ssize_t
ifalias_store(struct device
*dev
, struct device_attribute
*attr
,
358 const char *buf
, size_t len
)
360 struct net_device
*netdev
= to_net_dev(dev
);
361 struct net
*net
= dev_net(netdev
);
365 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
368 /* ignore trailing newline */
369 if (len
> 0 && buf
[len
- 1] == '\n')
373 return restart_syscall();
374 ret
= dev_set_alias(netdev
, buf
, count
);
377 return ret
< 0 ? ret
: len
;
380 static ssize_t
ifalias_show(struct device
*dev
,
381 struct device_attribute
*attr
, char *buf
)
383 const struct net_device
*netdev
= to_net_dev(dev
);
387 return restart_syscall();
389 ret
= sprintf(buf
, "%s\n", netdev
->ifalias
);
393 static DEVICE_ATTR_RW(ifalias
);
395 static int change_group(struct net_device
*dev
, unsigned long new_group
)
397 dev_set_group(dev
, (int) new_group
);
401 static ssize_t
group_store(struct device
*dev
, struct device_attribute
*attr
,
402 const char *buf
, size_t len
)
404 return netdev_store(dev
, attr
, buf
, len
, change_group
);
406 NETDEVICE_SHOW(group
, fmt_dec
);
407 static DEVICE_ATTR(netdev_group
, S_IRUGO
| S_IWUSR
, group_show
, group_store
);
409 static int change_proto_down(struct net_device
*dev
, unsigned long proto_down
)
411 return dev_change_proto_down(dev
, (bool) proto_down
);
414 static ssize_t
proto_down_store(struct device
*dev
,
415 struct device_attribute
*attr
,
416 const char *buf
, size_t len
)
418 return netdev_store(dev
, attr
, buf
, len
, change_proto_down
);
420 NETDEVICE_SHOW_RW(proto_down
, fmt_dec
);
422 static ssize_t
phys_port_id_show(struct device
*dev
,
423 struct device_attribute
*attr
, char *buf
)
425 struct net_device
*netdev
= to_net_dev(dev
);
426 ssize_t ret
= -EINVAL
;
429 return restart_syscall();
431 if (dev_isalive(netdev
)) {
432 struct netdev_phys_item_id ppid
;
434 ret
= dev_get_phys_port_id(netdev
, &ppid
);
436 ret
= sprintf(buf
, "%*phN\n", ppid
.id_len
, ppid
.id
);
442 static DEVICE_ATTR_RO(phys_port_id
);
444 static ssize_t
phys_port_name_show(struct device
*dev
,
445 struct device_attribute
*attr
, char *buf
)
447 struct net_device
*netdev
= to_net_dev(dev
);
448 ssize_t ret
= -EINVAL
;
451 return restart_syscall();
453 if (dev_isalive(netdev
)) {
456 ret
= dev_get_phys_port_name(netdev
, name
, sizeof(name
));
458 ret
= sprintf(buf
, "%s\n", name
);
464 static DEVICE_ATTR_RO(phys_port_name
);
466 static ssize_t
phys_switch_id_show(struct device
*dev
,
467 struct device_attribute
*attr
, char *buf
)
469 struct net_device
*netdev
= to_net_dev(dev
);
470 ssize_t ret
= -EINVAL
;
473 return restart_syscall();
475 if (dev_isalive(netdev
)) {
476 struct switchdev_attr attr
= {
478 .id
= SWITCHDEV_ATTR_ID_PORT_PARENT_ID
,
479 .flags
= SWITCHDEV_F_NO_RECURSE
,
482 ret
= switchdev_port_attr_get(netdev
, &attr
);
484 ret
= sprintf(buf
, "%*phN\n", attr
.u
.ppid
.id_len
,
491 static DEVICE_ATTR_RO(phys_switch_id
);
493 static struct attribute
*net_class_attrs
[] = {
494 &dev_attr_netdev_group
.attr
,
496 &dev_attr_dev_id
.attr
,
497 &dev_attr_dev_port
.attr
,
498 &dev_attr_iflink
.attr
,
499 &dev_attr_ifindex
.attr
,
500 &dev_attr_name_assign_type
.attr
,
501 &dev_attr_addr_assign_type
.attr
,
502 &dev_attr_addr_len
.attr
,
503 &dev_attr_link_mode
.attr
,
504 &dev_attr_address
.attr
,
505 &dev_attr_broadcast
.attr
,
506 &dev_attr_speed
.attr
,
507 &dev_attr_duplex
.attr
,
508 &dev_attr_dormant
.attr
,
509 &dev_attr_operstate
.attr
,
510 &dev_attr_carrier_changes
.attr
,
511 &dev_attr_ifalias
.attr
,
512 &dev_attr_carrier
.attr
,
514 &dev_attr_flags
.attr
,
515 &dev_attr_tx_queue_len
.attr
,
516 &dev_attr_gro_flush_timeout
.attr
,
517 &dev_attr_phys_port_id
.attr
,
518 &dev_attr_phys_port_name
.attr
,
519 &dev_attr_phys_switch_id
.attr
,
520 &dev_attr_proto_down
.attr
,
523 ATTRIBUTE_GROUPS(net_class
);
525 /* Show a given an attribute in the statistics group */
526 static ssize_t
netstat_show(const struct device
*d
,
527 struct device_attribute
*attr
, char *buf
,
528 unsigned long offset
)
530 struct net_device
*dev
= to_net_dev(d
);
531 ssize_t ret
= -EINVAL
;
533 WARN_ON(offset
> sizeof(struct rtnl_link_stats64
) ||
534 offset
% sizeof(u64
) != 0);
536 read_lock(&dev_base_lock
);
537 if (dev_isalive(dev
)) {
538 struct rtnl_link_stats64 temp
;
539 const struct rtnl_link_stats64
*stats
= dev_get_stats(dev
, &temp
);
541 ret
= sprintf(buf
, fmt_u64
, *(u64
*)(((u8
*) stats
) + offset
));
543 read_unlock(&dev_base_lock
);
547 /* generate a read-only statistics attribute */
548 #define NETSTAT_ENTRY(name) \
549 static ssize_t name##_show(struct device *d, \
550 struct device_attribute *attr, char *buf) \
552 return netstat_show(d, attr, buf, \
553 offsetof(struct rtnl_link_stats64, name)); \
555 static DEVICE_ATTR_RO(name)
557 NETSTAT_ENTRY(rx_packets
);
558 NETSTAT_ENTRY(tx_packets
);
559 NETSTAT_ENTRY(rx_bytes
);
560 NETSTAT_ENTRY(tx_bytes
);
561 NETSTAT_ENTRY(rx_errors
);
562 NETSTAT_ENTRY(tx_errors
);
563 NETSTAT_ENTRY(rx_dropped
);
564 NETSTAT_ENTRY(tx_dropped
);
565 NETSTAT_ENTRY(multicast
);
566 NETSTAT_ENTRY(collisions
);
567 NETSTAT_ENTRY(rx_length_errors
);
568 NETSTAT_ENTRY(rx_over_errors
);
569 NETSTAT_ENTRY(rx_crc_errors
);
570 NETSTAT_ENTRY(rx_frame_errors
);
571 NETSTAT_ENTRY(rx_fifo_errors
);
572 NETSTAT_ENTRY(rx_missed_errors
);
573 NETSTAT_ENTRY(tx_aborted_errors
);
574 NETSTAT_ENTRY(tx_carrier_errors
);
575 NETSTAT_ENTRY(tx_fifo_errors
);
576 NETSTAT_ENTRY(tx_heartbeat_errors
);
577 NETSTAT_ENTRY(tx_window_errors
);
578 NETSTAT_ENTRY(rx_compressed
);
579 NETSTAT_ENTRY(tx_compressed
);
580 NETSTAT_ENTRY(rx_nohandler
);
582 static struct attribute
*netstat_attrs
[] = {
583 &dev_attr_rx_packets
.attr
,
584 &dev_attr_tx_packets
.attr
,
585 &dev_attr_rx_bytes
.attr
,
586 &dev_attr_tx_bytes
.attr
,
587 &dev_attr_rx_errors
.attr
,
588 &dev_attr_tx_errors
.attr
,
589 &dev_attr_rx_dropped
.attr
,
590 &dev_attr_tx_dropped
.attr
,
591 &dev_attr_multicast
.attr
,
592 &dev_attr_collisions
.attr
,
593 &dev_attr_rx_length_errors
.attr
,
594 &dev_attr_rx_over_errors
.attr
,
595 &dev_attr_rx_crc_errors
.attr
,
596 &dev_attr_rx_frame_errors
.attr
,
597 &dev_attr_rx_fifo_errors
.attr
,
598 &dev_attr_rx_missed_errors
.attr
,
599 &dev_attr_tx_aborted_errors
.attr
,
600 &dev_attr_tx_carrier_errors
.attr
,
601 &dev_attr_tx_fifo_errors
.attr
,
602 &dev_attr_tx_heartbeat_errors
.attr
,
603 &dev_attr_tx_window_errors
.attr
,
604 &dev_attr_rx_compressed
.attr
,
605 &dev_attr_tx_compressed
.attr
,
606 &dev_attr_rx_nohandler
.attr
,
611 static struct attribute_group netstat_group
= {
612 .name
= "statistics",
613 .attrs
= netstat_attrs
,
616 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
617 static struct attribute
*wireless_attrs
[] = {
621 static struct attribute_group wireless_group
= {
623 .attrs
= wireless_attrs
,
627 #else /* CONFIG_SYSFS */
628 #define net_class_groups NULL
629 #endif /* CONFIG_SYSFS */
632 #define to_rx_queue_attr(_attr) container_of(_attr, \
633 struct rx_queue_attribute, attr)
635 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
637 static ssize_t
rx_queue_attr_show(struct kobject
*kobj
, struct attribute
*attr
,
640 struct rx_queue_attribute
*attribute
= to_rx_queue_attr(attr
);
641 struct netdev_rx_queue
*queue
= to_rx_queue(kobj
);
643 if (!attribute
->show
)
646 return attribute
->show(queue
, attribute
, buf
);
649 static ssize_t
rx_queue_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
650 const char *buf
, size_t count
)
652 struct rx_queue_attribute
*attribute
= to_rx_queue_attr(attr
);
653 struct netdev_rx_queue
*queue
= to_rx_queue(kobj
);
655 if (!attribute
->store
)
658 return attribute
->store(queue
, attribute
, buf
, count
);
661 static const struct sysfs_ops rx_queue_sysfs_ops
= {
662 .show
= rx_queue_attr_show
,
663 .store
= rx_queue_attr_store
,
667 static ssize_t
show_rps_map(struct netdev_rx_queue
*queue
,
668 struct rx_queue_attribute
*attribute
, char *buf
)
674 if (!zalloc_cpumask_var(&mask
, GFP_KERNEL
))
678 map
= rcu_dereference(queue
->rps_map
);
680 for (i
= 0; i
< map
->len
; i
++)
681 cpumask_set_cpu(map
->cpus
[i
], mask
);
683 len
= snprintf(buf
, PAGE_SIZE
, "%*pb\n", cpumask_pr_args(mask
));
685 free_cpumask_var(mask
);
687 return len
< PAGE_SIZE
? len
: -EINVAL
;
690 static ssize_t
store_rps_map(struct netdev_rx_queue
*queue
,
691 struct rx_queue_attribute
*attribute
,
692 const char *buf
, size_t len
)
694 struct rps_map
*old_map
, *map
;
697 static DEFINE_MUTEX(rps_map_mutex
);
699 if (!capable(CAP_NET_ADMIN
))
702 if (!alloc_cpumask_var(&mask
, GFP_KERNEL
))
705 err
= bitmap_parse(buf
, len
, cpumask_bits(mask
), nr_cpumask_bits
);
707 free_cpumask_var(mask
);
711 map
= kzalloc(max_t(unsigned int,
712 RPS_MAP_SIZE(cpumask_weight(mask
)), L1_CACHE_BYTES
),
715 free_cpumask_var(mask
);
720 for_each_cpu_and(cpu
, mask
, cpu_online_mask
)
721 map
->cpus
[i
++] = cpu
;
730 mutex_lock(&rps_map_mutex
);
731 old_map
= rcu_dereference_protected(queue
->rps_map
,
732 mutex_is_locked(&rps_map_mutex
));
733 rcu_assign_pointer(queue
->rps_map
, map
);
736 static_key_slow_inc(&rps_needed
);
738 static_key_slow_dec(&rps_needed
);
740 mutex_unlock(&rps_map_mutex
);
743 kfree_rcu(old_map
, rcu
);
745 free_cpumask_var(mask
);
749 static ssize_t
show_rps_dev_flow_table_cnt(struct netdev_rx_queue
*queue
,
750 struct rx_queue_attribute
*attr
,
753 struct rps_dev_flow_table
*flow_table
;
754 unsigned long val
= 0;
757 flow_table
= rcu_dereference(queue
->rps_flow_table
);
759 val
= (unsigned long)flow_table
->mask
+ 1;
762 return sprintf(buf
, "%lu\n", val
);
765 static void rps_dev_flow_table_release(struct rcu_head
*rcu
)
767 struct rps_dev_flow_table
*table
= container_of(rcu
,
768 struct rps_dev_flow_table
, rcu
);
772 static ssize_t
store_rps_dev_flow_table_cnt(struct netdev_rx_queue
*queue
,
773 struct rx_queue_attribute
*attr
,
774 const char *buf
, size_t len
)
776 unsigned long mask
, count
;
777 struct rps_dev_flow_table
*table
, *old_table
;
778 static DEFINE_SPINLOCK(rps_dev_flow_lock
);
781 if (!capable(CAP_NET_ADMIN
))
784 rc
= kstrtoul(buf
, 0, &count
);
790 /* mask = roundup_pow_of_two(count) - 1;
791 * without overflows...
793 while ((mask
| (mask
>> 1)) != mask
)
795 /* On 64 bit arches, must check mask fits in table->mask (u32),
796 * and on 32bit arches, must check
797 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
799 #if BITS_PER_LONG > 32
800 if (mask
> (unsigned long)(u32
)mask
)
803 if (mask
> (ULONG_MAX
- RPS_DEV_FLOW_TABLE_SIZE(1))
804 / sizeof(struct rps_dev_flow
)) {
805 /* Enforce a limit to prevent overflow */
809 table
= vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask
+ 1));
814 for (count
= 0; count
<= mask
; count
++)
815 table
->flows
[count
].cpu
= RPS_NO_CPU
;
819 spin_lock(&rps_dev_flow_lock
);
820 old_table
= rcu_dereference_protected(queue
->rps_flow_table
,
821 lockdep_is_held(&rps_dev_flow_lock
));
822 rcu_assign_pointer(queue
->rps_flow_table
, table
);
823 spin_unlock(&rps_dev_flow_lock
);
826 call_rcu(&old_table
->rcu
, rps_dev_flow_table_release
);
831 static struct rx_queue_attribute rps_cpus_attribute
=
832 __ATTR(rps_cpus
, S_IRUGO
| S_IWUSR
, show_rps_map
, store_rps_map
);
835 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute
=
836 __ATTR(rps_flow_cnt
, S_IRUGO
| S_IWUSR
,
837 show_rps_dev_flow_table_cnt
, store_rps_dev_flow_table_cnt
);
838 #endif /* CONFIG_RPS */
840 static struct attribute
*rx_queue_default_attrs
[] = {
842 &rps_cpus_attribute
.attr
,
843 &rps_dev_flow_table_cnt_attribute
.attr
,
848 static void rx_queue_release(struct kobject
*kobj
)
850 struct netdev_rx_queue
*queue
= to_rx_queue(kobj
);
853 struct rps_dev_flow_table
*flow_table
;
856 map
= rcu_dereference_protected(queue
->rps_map
, 1);
858 RCU_INIT_POINTER(queue
->rps_map
, NULL
);
862 flow_table
= rcu_dereference_protected(queue
->rps_flow_table
, 1);
864 RCU_INIT_POINTER(queue
->rps_flow_table
, NULL
);
865 call_rcu(&flow_table
->rcu
, rps_dev_flow_table_release
);
869 memset(kobj
, 0, sizeof(*kobj
));
873 static const void *rx_queue_namespace(struct kobject
*kobj
)
875 struct netdev_rx_queue
*queue
= to_rx_queue(kobj
);
876 struct device
*dev
= &queue
->dev
->dev
;
877 const void *ns
= NULL
;
879 if (dev
->class && dev
->class->ns_type
)
880 ns
= dev
->class->namespace(dev
);
885 static struct kobj_type rx_queue_ktype
= {
886 .sysfs_ops
= &rx_queue_sysfs_ops
,
887 .release
= rx_queue_release
,
888 .default_attrs
= rx_queue_default_attrs
,
889 .namespace = rx_queue_namespace
892 static int rx_queue_add_kobject(struct net_device
*dev
, int index
)
894 struct netdev_rx_queue
*queue
= dev
->_rx
+ index
;
895 struct kobject
*kobj
= &queue
->kobj
;
898 kobj
->kset
= dev
->queues_kset
;
899 error
= kobject_init_and_add(kobj
, &rx_queue_ktype
, NULL
,
904 if (dev
->sysfs_rx_queue_group
) {
905 error
= sysfs_create_group(kobj
, dev
->sysfs_rx_queue_group
);
910 kobject_uevent(kobj
, KOBJ_ADD
);
911 dev_hold(queue
->dev
);
918 #endif /* CONFIG_SYSFS */
921 net_rx_queue_update_kobjects(struct net_device
*dev
, int old_num
, int new_num
)
928 if (!dev
->sysfs_rx_queue_group
)
931 for (i
= old_num
; i
< new_num
; i
++) {
932 error
= rx_queue_add_kobject(dev
, i
);
939 while (--i
>= new_num
) {
940 if (dev
->sysfs_rx_queue_group
)
941 sysfs_remove_group(&dev
->_rx
[i
].kobj
,
942 dev
->sysfs_rx_queue_group
);
943 kobject_put(&dev
->_rx
[i
].kobj
);
954 * netdev_queue sysfs structures and functions.
956 struct netdev_queue_attribute
{
957 struct attribute attr
;
958 ssize_t (*show
)(struct netdev_queue
*queue
,
959 struct netdev_queue_attribute
*attr
, char *buf
);
960 ssize_t (*store
)(struct netdev_queue
*queue
,
961 struct netdev_queue_attribute
*attr
, const char *buf
, size_t len
);
963 #define to_netdev_queue_attr(_attr) container_of(_attr, \
964 struct netdev_queue_attribute, attr)
966 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
968 static ssize_t
netdev_queue_attr_show(struct kobject
*kobj
,
969 struct attribute
*attr
, char *buf
)
971 struct netdev_queue_attribute
*attribute
= to_netdev_queue_attr(attr
);
972 struct netdev_queue
*queue
= to_netdev_queue(kobj
);
974 if (!attribute
->show
)
977 return attribute
->show(queue
, attribute
, buf
);
980 static ssize_t
netdev_queue_attr_store(struct kobject
*kobj
,
981 struct attribute
*attr
,
982 const char *buf
, size_t count
)
984 struct netdev_queue_attribute
*attribute
= to_netdev_queue_attr(attr
);
985 struct netdev_queue
*queue
= to_netdev_queue(kobj
);
987 if (!attribute
->store
)
990 return attribute
->store(queue
, attribute
, buf
, count
);
993 static const struct sysfs_ops netdev_queue_sysfs_ops
= {
994 .show
= netdev_queue_attr_show
,
995 .store
= netdev_queue_attr_store
,
998 static ssize_t
show_trans_timeout(struct netdev_queue
*queue
,
999 struct netdev_queue_attribute
*attribute
,
1002 unsigned long trans_timeout
;
1004 spin_lock_irq(&queue
->_xmit_lock
);
1005 trans_timeout
= queue
->trans_timeout
;
1006 spin_unlock_irq(&queue
->_xmit_lock
);
1008 return sprintf(buf
, "%lu", trans_timeout
);
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
);
1023 static ssize_t
show_tx_maxrate(struct netdev_queue
*queue
,
1024 struct netdev_queue_attribute
*attribute
,
1027 return sprintf(buf
, "%lu\n", queue
->tx_maxrate
);
1030 static ssize_t
set_tx_maxrate(struct netdev_queue
*queue
,
1031 struct netdev_queue_attribute
*attribute
,
1032 const char *buf
, size_t len
)
1034 struct net_device
*dev
= queue
->dev
;
1035 int err
, index
= get_netdev_queue_index(queue
);
1038 err
= kstrtou32(buf
, 10, &rate
);
1042 if (!rtnl_trylock())
1043 return restart_syscall();
1046 if (dev
->netdev_ops
->ndo_set_tx_maxrate
)
1047 err
= dev
->netdev_ops
->ndo_set_tx_maxrate(dev
, index
, rate
);
1051 queue
->tx_maxrate
= rate
;
1057 static struct netdev_queue_attribute queue_tx_maxrate
=
1058 __ATTR(tx_maxrate
, S_IRUGO
| S_IWUSR
,
1059 show_tx_maxrate
, set_tx_maxrate
);
1062 static struct netdev_queue_attribute queue_trans_timeout
=
1063 __ATTR(tx_timeout
, S_IRUGO
, show_trans_timeout
, NULL
);
1067 * Byte queue limits sysfs structures and functions.
1069 static ssize_t
bql_show(char *buf
, unsigned int value
)
1071 return sprintf(buf
, "%u\n", value
);
1074 static ssize_t
bql_set(const char *buf
, const size_t count
,
1075 unsigned int *pvalue
)
1080 if (!strcmp(buf
, "max") || !strcmp(buf
, "max\n"))
1081 value
= DQL_MAX_LIMIT
;
1083 err
= kstrtouint(buf
, 10, &value
);
1086 if (value
> DQL_MAX_LIMIT
)
1095 static ssize_t
bql_show_hold_time(struct netdev_queue
*queue
,
1096 struct netdev_queue_attribute
*attr
,
1099 struct dql
*dql
= &queue
->dql
;
1101 return sprintf(buf
, "%u\n", jiffies_to_msecs(dql
->slack_hold_time
));
1104 static ssize_t
bql_set_hold_time(struct netdev_queue
*queue
,
1105 struct netdev_queue_attribute
*attribute
,
1106 const char *buf
, size_t len
)
1108 struct dql
*dql
= &queue
->dql
;
1112 err
= kstrtouint(buf
, 10, &value
);
1116 dql
->slack_hold_time
= msecs_to_jiffies(value
);
1121 static struct netdev_queue_attribute bql_hold_time_attribute
=
1122 __ATTR(hold_time
, S_IRUGO
| S_IWUSR
, bql_show_hold_time
,
1125 static ssize_t
bql_show_inflight(struct netdev_queue
*queue
,
1126 struct netdev_queue_attribute
*attr
,
1129 struct dql
*dql
= &queue
->dql
;
1131 return sprintf(buf
, "%u\n", dql
->num_queued
- dql
->num_completed
);
1134 static struct netdev_queue_attribute bql_inflight_attribute
=
1135 __ATTR(inflight
, S_IRUGO
, bql_show_inflight
, NULL
);
1137 #define BQL_ATTR(NAME, FIELD) \
1138 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1139 struct netdev_queue_attribute *attr, \
1142 return bql_show(buf, queue->dql.FIELD); \
1145 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1146 struct netdev_queue_attribute *attr, \
1147 const char *buf, size_t len) \
1149 return bql_set(buf, len, &queue->dql.FIELD); \
1152 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \
1153 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \
1156 BQL_ATTR(limit
, limit
)
1157 BQL_ATTR(limit_max
, max_limit
)
1158 BQL_ATTR(limit_min
, min_limit
)
1160 static struct attribute
*dql_attrs
[] = {
1161 &bql_limit_attribute
.attr
,
1162 &bql_limit_max_attribute
.attr
,
1163 &bql_limit_min_attribute
.attr
,
1164 &bql_hold_time_attribute
.attr
,
1165 &bql_inflight_attribute
.attr
,
1169 static struct attribute_group dql_group
= {
1170 .name
= "byte_queue_limits",
1173 #endif /* CONFIG_BQL */
1176 static ssize_t
show_xps_map(struct netdev_queue
*queue
,
1177 struct netdev_queue_attribute
*attribute
, char *buf
)
1179 struct net_device
*dev
= queue
->dev
;
1180 struct xps_dev_maps
*dev_maps
;
1182 unsigned long index
;
1185 if (!zalloc_cpumask_var(&mask
, GFP_KERNEL
))
1188 index
= get_netdev_queue_index(queue
);
1191 dev_maps
= rcu_dereference(dev
->xps_maps
);
1193 for_each_possible_cpu(i
) {
1194 struct xps_map
*map
=
1195 rcu_dereference(dev_maps
->cpu_map
[i
]);
1198 for (j
= 0; j
< map
->len
; j
++) {
1199 if (map
->queues
[j
] == index
) {
1200 cpumask_set_cpu(i
, mask
);
1209 len
= snprintf(buf
, PAGE_SIZE
, "%*pb\n", cpumask_pr_args(mask
));
1210 free_cpumask_var(mask
);
1211 return len
< PAGE_SIZE
? len
: -EINVAL
;
1214 static ssize_t
store_xps_map(struct netdev_queue
*queue
,
1215 struct netdev_queue_attribute
*attribute
,
1216 const char *buf
, size_t len
)
1218 struct net_device
*dev
= queue
->dev
;
1219 unsigned long index
;
1223 if (!capable(CAP_NET_ADMIN
))
1226 if (!alloc_cpumask_var(&mask
, GFP_KERNEL
))
1229 index
= get_netdev_queue_index(queue
);
1231 err
= bitmap_parse(buf
, len
, cpumask_bits(mask
), nr_cpumask_bits
);
1233 free_cpumask_var(mask
);
1237 err
= netif_set_xps_queue(dev
, mask
, index
);
1239 free_cpumask_var(mask
);
1244 static struct netdev_queue_attribute xps_cpus_attribute
=
1245 __ATTR(xps_cpus
, S_IRUGO
| S_IWUSR
, show_xps_map
, store_xps_map
);
1246 #endif /* CONFIG_XPS */
1248 static struct attribute
*netdev_queue_default_attrs
[] = {
1249 &queue_trans_timeout
.attr
,
1251 &xps_cpus_attribute
.attr
,
1252 &queue_tx_maxrate
.attr
,
1257 static void netdev_queue_release(struct kobject
*kobj
)
1259 struct netdev_queue
*queue
= to_netdev_queue(kobj
);
1261 memset(kobj
, 0, sizeof(*kobj
));
1262 dev_put(queue
->dev
);
1265 static const void *netdev_queue_namespace(struct kobject
*kobj
)
1267 struct netdev_queue
*queue
= to_netdev_queue(kobj
);
1268 struct device
*dev
= &queue
->dev
->dev
;
1269 const void *ns
= NULL
;
1271 if (dev
->class && dev
->class->ns_type
)
1272 ns
= dev
->class->namespace(dev
);
1277 static struct kobj_type netdev_queue_ktype
= {
1278 .sysfs_ops
= &netdev_queue_sysfs_ops
,
1279 .release
= netdev_queue_release
,
1280 .default_attrs
= netdev_queue_default_attrs
,
1281 .namespace = netdev_queue_namespace
,
1284 static int netdev_queue_add_kobject(struct net_device
*dev
, int index
)
1286 struct netdev_queue
*queue
= dev
->_tx
+ index
;
1287 struct kobject
*kobj
= &queue
->kobj
;
1290 kobj
->kset
= dev
->queues_kset
;
1291 error
= kobject_init_and_add(kobj
, &netdev_queue_ktype
, NULL
,
1297 error
= sysfs_create_group(kobj
, &dql_group
);
1302 kobject_uevent(kobj
, KOBJ_ADD
);
1303 dev_hold(queue
->dev
);
1310 #endif /* CONFIG_SYSFS */
1313 netdev_queue_update_kobjects(struct net_device
*dev
, int old_num
, int new_num
)
1319 for (i
= old_num
; i
< new_num
; i
++) {
1320 error
= netdev_queue_add_kobject(dev
, i
);
1327 while (--i
>= new_num
) {
1328 struct netdev_queue
*queue
= dev
->_tx
+ i
;
1331 sysfs_remove_group(&queue
->kobj
, &dql_group
);
1333 kobject_put(&queue
->kobj
);
1339 #endif /* CONFIG_SYSFS */
1342 static int register_queue_kobjects(struct net_device
*dev
)
1344 int error
= 0, txq
= 0, rxq
= 0, real_rx
= 0, real_tx
= 0;
1347 dev
->queues_kset
= kset_create_and_add("queues",
1348 NULL
, &dev
->dev
.kobj
);
1349 if (!dev
->queues_kset
)
1351 real_rx
= dev
->real_num_rx_queues
;
1353 real_tx
= dev
->real_num_tx_queues
;
1355 error
= net_rx_queue_update_kobjects(dev
, 0, real_rx
);
1360 error
= netdev_queue_update_kobjects(dev
, 0, real_tx
);
1368 netdev_queue_update_kobjects(dev
, txq
, 0);
1369 net_rx_queue_update_kobjects(dev
, rxq
, 0);
1373 static void remove_queue_kobjects(struct net_device
*dev
)
1375 int real_rx
= 0, real_tx
= 0;
1378 real_rx
= dev
->real_num_rx_queues
;
1380 real_tx
= dev
->real_num_tx_queues
;
1382 net_rx_queue_update_kobjects(dev
, real_rx
, 0);
1383 netdev_queue_update_kobjects(dev
, real_tx
, 0);
1385 kset_unregister(dev
->queues_kset
);
1389 static bool net_current_may_mount(void)
1391 struct net
*net
= current
->nsproxy
->net_ns
;
1393 return ns_capable(net
->user_ns
, CAP_SYS_ADMIN
);
1396 static void *net_grab_current_ns(void)
1398 struct net
*ns
= current
->nsproxy
->net_ns
;
1399 #ifdef CONFIG_NET_NS
1401 atomic_inc(&ns
->passive
);
1406 static const void *net_initial_ns(void)
1411 static const void *net_netlink_ns(struct sock
*sk
)
1413 return sock_net(sk
);
1416 struct kobj_ns_type_operations net_ns_type_operations
= {
1417 .type
= KOBJ_NS_TYPE_NET
,
1418 .current_may_mount
= net_current_may_mount
,
1419 .grab_current_ns
= net_grab_current_ns
,
1420 .netlink_ns
= net_netlink_ns
,
1421 .initial_ns
= net_initial_ns
,
1422 .drop_ns
= net_drop_ns
,
1424 EXPORT_SYMBOL_GPL(net_ns_type_operations
);
1426 static int netdev_uevent(struct device
*d
, struct kobj_uevent_env
*env
)
1428 struct net_device
*dev
= to_net_dev(d
);
1431 /* pass interface to uevent. */
1432 retval
= add_uevent_var(env
, "INTERFACE=%s", dev
->name
);
1436 /* pass ifindex to uevent.
1437 * ifindex is useful as it won't change (interface name may change)
1438 * and is what RtNetlink uses natively. */
1439 retval
= add_uevent_var(env
, "IFINDEX=%d", dev
->ifindex
);
1446 * netdev_release -- destroy and free a dead device.
1447 * Called when last reference to device kobject is gone.
1449 static void netdev_release(struct device
*d
)
1451 struct net_device
*dev
= to_net_dev(d
);
1453 BUG_ON(dev
->reg_state
!= NETREG_RELEASED
);
1455 kfree(dev
->ifalias
);
1456 netdev_freemem(dev
);
1459 static const void *net_namespace(struct device
*d
)
1461 struct net_device
*dev
= to_net_dev(d
);
1463 return dev_net(dev
);
1466 static struct class net_class
= {
1468 .dev_release
= netdev_release
,
1469 .dev_groups
= net_class_groups
,
1470 .dev_uevent
= netdev_uevent
,
1471 .ns_type
= &net_ns_type_operations
,
1472 .namespace = net_namespace
,
1475 #ifdef CONFIG_OF_NET
1476 static int of_dev_node_match(struct device
*dev
, const void *data
)
1481 ret
= dev
->parent
->of_node
== data
;
1483 return ret
== 0 ? dev
->of_node
== data
: ret
;
1487 * of_find_net_device_by_node - lookup the net device for the device node
1488 * @np: OF device node
1490 * Looks up the net_device structure corresponding with the device node.
1491 * If successful, returns a pointer to the net_device with the embedded
1492 * struct device refcount incremented by one, or NULL on failure. The
1493 * refcount must be dropped when done with the net_device.
1495 struct net_device
*of_find_net_device_by_node(struct device_node
*np
)
1499 dev
= class_find_device(&net_class
, NULL
, np
, of_dev_node_match
);
1503 return to_net_dev(dev
);
1505 EXPORT_SYMBOL(of_find_net_device_by_node
);
1508 /* Delete sysfs entries but hold kobject reference until after all
1509 * netdev references are gone.
1511 void netdev_unregister_kobject(struct net_device
*ndev
)
1513 struct device
*dev
= &(ndev
->dev
);
1515 kobject_get(&dev
->kobj
);
1517 remove_queue_kobjects(ndev
);
1519 pm_runtime_set_memalloc_noio(dev
, false);
1524 /* Create sysfs entries for network device. */
1525 int netdev_register_kobject(struct net_device
*ndev
)
1527 struct device
*dev
= &(ndev
->dev
);
1528 const struct attribute_group
**groups
= ndev
->sysfs_groups
;
1531 device_initialize(dev
);
1532 dev
->class = &net_class
;
1533 dev
->platform_data
= ndev
;
1534 dev
->groups
= groups
;
1536 dev_set_name(dev
, "%s", ndev
->name
);
1539 /* Allow for a device specific group */
1543 *groups
++ = &netstat_group
;
1545 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1546 if (ndev
->ieee80211_ptr
)
1547 *groups
++ = &wireless_group
;
1548 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1549 else if (ndev
->wireless_handlers
)
1550 *groups
++ = &wireless_group
;
1553 #endif /* CONFIG_SYSFS */
1555 error
= device_add(dev
);
1559 error
= register_queue_kobjects(ndev
);
1565 pm_runtime_set_memalloc_noio(dev
, true);
1570 int netdev_class_create_file_ns(struct class_attribute
*class_attr
,
1573 return class_create_file_ns(&net_class
, class_attr
, ns
);
1575 EXPORT_SYMBOL(netdev_class_create_file_ns
);
1577 void netdev_class_remove_file_ns(struct class_attribute
*class_attr
,
1580 class_remove_file_ns(&net_class
, class_attr
, ns
);
1582 EXPORT_SYMBOL(netdev_class_remove_file_ns
);
1584 int __init
netdev_kobject_init(void)
1586 kobj_ns_type_register(&net_ns_type_operations
);
1587 return class_register(&net_class
);