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1/*
2 * net-sysfs.c - network device class and attributes
3 *
4 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
5 *
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.
10 */
11
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/sched/signal.h>
19#include <linux/nsproxy.h>
20#include <net/sock.h>
21#include <net/net_namespace.h>
22#include <linux/rtnetlink.h>
23#include <linux/vmalloc.h>
24#include <linux/export.h>
25#include <linux/jiffies.h>
26#include <linux/pm_runtime.h>
27#include <linux/of.h>
28#include <linux/of_net.h>
29
30#include "net-sysfs.h"
31
32#ifdef CONFIG_SYSFS
33static const char fmt_hex[] = "%#x\n";
34static const char fmt_dec[] = "%d\n";
35static const char fmt_ulong[] = "%lu\n";
36static const char fmt_u64[] = "%llu\n";
37
38static inline int dev_isalive(const struct net_device *dev)
39{
40 return dev->reg_state <= NETREG_REGISTERED;
41}
42
43/* use same locking rules as GIF* ioctl's */
44static ssize_t netdev_show(const struct device *dev,
45 struct device_attribute *attr, char *buf,
46 ssize_t (*format)(const struct net_device *, char *))
47{
48 struct net_device *ndev = to_net_dev(dev);
49 ssize_t ret = -EINVAL;
50
51 read_lock(&dev_base_lock);
52 if (dev_isalive(ndev))
53 ret = (*format)(ndev, buf);
54 read_unlock(&dev_base_lock);
55
56 return ret;
57}
58
59/* generate a show function for simple field */
60#define NETDEVICE_SHOW(field, format_string) \
61static ssize_t format_##field(const struct net_device *dev, char *buf) \
62{ \
63 return sprintf(buf, format_string, dev->field); \
64} \
65static ssize_t field##_show(struct device *dev, \
66 struct device_attribute *attr, char *buf) \
67{ \
68 return netdev_show(dev, attr, buf, format_##field); \
69} \
70
71#define NETDEVICE_SHOW_RO(field, format_string) \
72NETDEVICE_SHOW(field, format_string); \
73static DEVICE_ATTR_RO(field)
74
75#define NETDEVICE_SHOW_RW(field, format_string) \
76NETDEVICE_SHOW(field, format_string); \
77static DEVICE_ATTR_RW(field)
78
79/* use same locking and permission rules as SIF* ioctl's */
80static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
81 const char *buf, size_t len,
82 int (*set)(struct net_device *, unsigned long))
83{
84 struct net_device *netdev = to_net_dev(dev);
85 struct net *net = dev_net(netdev);
86 unsigned long new;
87 int ret = -EINVAL;
88
89 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
90 return -EPERM;
91
92 ret = kstrtoul(buf, 0, &new);
93 if (ret)
94 goto err;
95
96 if (!rtnl_trylock())
97 return restart_syscall();
98
99 if (dev_isalive(netdev)) {
100 ret = (*set)(netdev, new);
101 if (ret == 0)
102 ret = len;
103 }
104 rtnl_unlock();
105 err:
106 return ret;
107}
108
109NETDEVICE_SHOW_RO(dev_id, fmt_hex);
110NETDEVICE_SHOW_RO(dev_port, fmt_dec);
111NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
112NETDEVICE_SHOW_RO(addr_len, fmt_dec);
113NETDEVICE_SHOW_RO(ifindex, fmt_dec);
114NETDEVICE_SHOW_RO(type, fmt_dec);
115NETDEVICE_SHOW_RO(link_mode, fmt_dec);
116
117static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
118 char *buf)
119{
120 struct net_device *ndev = to_net_dev(dev);
121
122 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
123}
124static DEVICE_ATTR_RO(iflink);
125
126static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
127{
128 return sprintf(buf, fmt_dec, dev->name_assign_type);
129}
130
131static ssize_t name_assign_type_show(struct device *dev,
132 struct device_attribute *attr,
133 char *buf)
134{
135 struct net_device *ndev = to_net_dev(dev);
136 ssize_t ret = -EINVAL;
137
138 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
139 ret = netdev_show(dev, attr, buf, format_name_assign_type);
140
141 return ret;
142}
143static DEVICE_ATTR_RO(name_assign_type);
144
145/* use same locking rules as GIFHWADDR ioctl's */
146static ssize_t address_show(struct device *dev, struct device_attribute *attr,
147 char *buf)
148{
149 struct net_device *ndev = to_net_dev(dev);
150 ssize_t ret = -EINVAL;
151
152 read_lock(&dev_base_lock);
153 if (dev_isalive(ndev))
154 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
155 read_unlock(&dev_base_lock);
156 return ret;
157}
158static DEVICE_ATTR_RO(address);
159
160static ssize_t broadcast_show(struct device *dev,
161 struct device_attribute *attr, char *buf)
162{
163 struct net_device *ndev = to_net_dev(dev);
164
165 if (dev_isalive(ndev))
166 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
167 return -EINVAL;
168}
169static DEVICE_ATTR_RO(broadcast);
170
171static int change_carrier(struct net_device *dev, unsigned long new_carrier)
172{
173 if (!netif_running(dev))
174 return -EINVAL;
175 return dev_change_carrier(dev, (bool)new_carrier);
176}
177
178static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
179 const char *buf, size_t len)
180{
181 return netdev_store(dev, attr, buf, len, change_carrier);
182}
183
184static ssize_t carrier_show(struct device *dev,
185 struct device_attribute *attr, char *buf)
186{
187 struct net_device *netdev = to_net_dev(dev);
188
189 if (netif_running(netdev))
190 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
191
192 return -EINVAL;
193}
194static DEVICE_ATTR_RW(carrier);
195
196static ssize_t speed_show(struct device *dev,
197 struct device_attribute *attr, char *buf)
198{
199 struct net_device *netdev = to_net_dev(dev);
200 int ret = -EINVAL;
201
202 if (!rtnl_trylock())
203 return restart_syscall();
204
205 if (netif_running(netdev)) {
206 struct ethtool_link_ksettings cmd;
207
208 if (!__ethtool_get_link_ksettings(netdev, &cmd))
209 ret = sprintf(buf, fmt_dec, cmd.base.speed);
210 }
211 rtnl_unlock();
212 return ret;
213}
214static DEVICE_ATTR_RO(speed);
215
216static ssize_t duplex_show(struct device *dev,
217 struct device_attribute *attr, char *buf)
218{
219 struct net_device *netdev = to_net_dev(dev);
220 int ret = -EINVAL;
221
222 if (!rtnl_trylock())
223 return restart_syscall();
224
225 if (netif_running(netdev)) {
226 struct ethtool_link_ksettings cmd;
227
228 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
229 const char *duplex;
230
231 switch (cmd.base.duplex) {
232 case DUPLEX_HALF:
233 duplex = "half";
234 break;
235 case DUPLEX_FULL:
236 duplex = "full";
237 break;
238 default:
239 duplex = "unknown";
240 break;
241 }
242 ret = sprintf(buf, "%s\n", duplex);
243 }
244 }
245 rtnl_unlock();
246 return ret;
247}
248static DEVICE_ATTR_RO(duplex);
249
250static ssize_t dormant_show(struct device *dev,
251 struct device_attribute *attr, char *buf)
252{
253 struct net_device *netdev = to_net_dev(dev);
254
255 if (netif_running(netdev))
256 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
257
258 return -EINVAL;
259}
260static DEVICE_ATTR_RO(dormant);
261
262static const char *const operstates[] = {
263 "unknown",
264 "notpresent", /* currently unused */
265 "down",
266 "lowerlayerdown",
267 "testing", /* currently unused */
268 "dormant",
269 "up"
270};
271
272static ssize_t operstate_show(struct device *dev,
273 struct device_attribute *attr, char *buf)
274{
275 const struct net_device *netdev = to_net_dev(dev);
276 unsigned char operstate;
277
278 read_lock(&dev_base_lock);
279 operstate = netdev->operstate;
280 if (!netif_running(netdev))
281 operstate = IF_OPER_DOWN;
282 read_unlock(&dev_base_lock);
283
284 if (operstate >= ARRAY_SIZE(operstates))
285 return -EINVAL; /* should not happen */
286
287 return sprintf(buf, "%s\n", operstates[operstate]);
288}
289static DEVICE_ATTR_RO(operstate);
290
291static ssize_t carrier_changes_show(struct device *dev,
292 struct device_attribute *attr,
293 char *buf)
294{
295 struct net_device *netdev = to_net_dev(dev);
296
297 return sprintf(buf, fmt_dec,
298 atomic_read(&netdev->carrier_up_count) +
299 atomic_read(&netdev->carrier_down_count));
300}
301static DEVICE_ATTR_RO(carrier_changes);
302
303static ssize_t carrier_up_count_show(struct device *dev,
304 struct device_attribute *attr,
305 char *buf)
306{
307 struct net_device *netdev = to_net_dev(dev);
308
309 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
310}
311static DEVICE_ATTR_RO(carrier_up_count);
312
313static ssize_t carrier_down_count_show(struct device *dev,
314 struct device_attribute *attr,
315 char *buf)
316{
317 struct net_device *netdev = to_net_dev(dev);
318
319 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
320}
321static DEVICE_ATTR_RO(carrier_down_count);
322
323/* read-write attributes */
324
325static int change_mtu(struct net_device *dev, unsigned long new_mtu)
326{
327 return dev_set_mtu(dev, (int)new_mtu);
328}
329
330static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
331 const char *buf, size_t len)
332{
333 return netdev_store(dev, attr, buf, len, change_mtu);
334}
335NETDEVICE_SHOW_RW(mtu, fmt_dec);
336
337static int change_flags(struct net_device *dev, unsigned long new_flags)
338{
339 return dev_change_flags(dev, (unsigned int)new_flags);
340}
341
342static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
343 const char *buf, size_t len)
344{
345 return netdev_store(dev, attr, buf, len, change_flags);
346}
347NETDEVICE_SHOW_RW(flags, fmt_hex);
348
349static ssize_t tx_queue_len_store(struct device *dev,
350 struct device_attribute *attr,
351 const char *buf, size_t len)
352{
353 if (!capable(CAP_NET_ADMIN))
354 return -EPERM;
355
356 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
357}
358NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
359
360static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
361{
362 dev->gro_flush_timeout = val;
363 return 0;
364}
365
366static ssize_t gro_flush_timeout_store(struct device *dev,
367 struct device_attribute *attr,
368 const char *buf, size_t len)
369{
370 if (!capable(CAP_NET_ADMIN))
371 return -EPERM;
372
373 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
374}
375NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
376
377static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
378 const char *buf, size_t len)
379{
380 struct net_device *netdev = to_net_dev(dev);
381 struct net *net = dev_net(netdev);
382 size_t count = len;
383 ssize_t ret = 0;
384
385 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
386 return -EPERM;
387
388 /* ignore trailing newline */
389 if (len > 0 && buf[len - 1] == '\n')
390 --count;
391
392 if (!rtnl_trylock())
393 return restart_syscall();
394
395 if (dev_isalive(netdev)) {
396 ret = dev_set_alias(netdev, buf, count);
397 if (ret < 0)
398 goto err;
399 ret = len;
400 netdev_state_change(netdev);
401 }
402err:
403 rtnl_unlock();
404
405 return ret;
406}
407
408static ssize_t ifalias_show(struct device *dev,
409 struct device_attribute *attr, char *buf)
410{
411 const struct net_device *netdev = to_net_dev(dev);
412 char tmp[IFALIASZ];
413 ssize_t ret = 0;
414
415 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
416 if (ret > 0)
417 ret = sprintf(buf, "%s\n", tmp);
418 return ret;
419}
420static DEVICE_ATTR_RW(ifalias);
421
422static int change_group(struct net_device *dev, unsigned long new_group)
423{
424 dev_set_group(dev, (int)new_group);
425 return 0;
426}
427
428static ssize_t group_store(struct device *dev, struct device_attribute *attr,
429 const char *buf, size_t len)
430{
431 return netdev_store(dev, attr, buf, len, change_group);
432}
433NETDEVICE_SHOW(group, fmt_dec);
434static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
435
436static int change_proto_down(struct net_device *dev, unsigned long proto_down)
437{
438 return dev_change_proto_down(dev, (bool)proto_down);
439}
440
441static ssize_t proto_down_store(struct device *dev,
442 struct device_attribute *attr,
443 const char *buf, size_t len)
444{
445 return netdev_store(dev, attr, buf, len, change_proto_down);
446}
447NETDEVICE_SHOW_RW(proto_down, fmt_dec);
448
449static ssize_t phys_port_id_show(struct device *dev,
450 struct device_attribute *attr, char *buf)
451{
452 struct net_device *netdev = to_net_dev(dev);
453 ssize_t ret = -EINVAL;
454
455 if (!rtnl_trylock())
456 return restart_syscall();
457
458 if (dev_isalive(netdev)) {
459 struct netdev_phys_item_id ppid;
460
461 ret = dev_get_phys_port_id(netdev, &ppid);
462 if (!ret)
463 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
464 }
465 rtnl_unlock();
466
467 return ret;
468}
469static DEVICE_ATTR_RO(phys_port_id);
470
471static ssize_t phys_port_name_show(struct device *dev,
472 struct device_attribute *attr, char *buf)
473{
474 struct net_device *netdev = to_net_dev(dev);
475 ssize_t ret = -EINVAL;
476
477 if (!rtnl_trylock())
478 return restart_syscall();
479
480 if (dev_isalive(netdev)) {
481 char name[IFNAMSIZ];
482
483 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
484 if (!ret)
485 ret = sprintf(buf, "%s\n", name);
486 }
487 rtnl_unlock();
488
489 return ret;
490}
491static DEVICE_ATTR_RO(phys_port_name);
492
493static ssize_t phys_switch_id_show(struct device *dev,
494 struct device_attribute *attr, char *buf)
495{
496 struct net_device *netdev = to_net_dev(dev);
497 ssize_t ret = -EINVAL;
498
499 if (!rtnl_trylock())
500 return restart_syscall();
501
502 if (dev_isalive(netdev)) {
503 struct switchdev_attr attr = {
504 .orig_dev = netdev,
505 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
506 .flags = SWITCHDEV_F_NO_RECURSE,
507 };
508
509 ret = switchdev_port_attr_get(netdev, &attr);
510 if (!ret)
511 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
512 attr.u.ppid.id);
513 }
514 rtnl_unlock();
515
516 return ret;
517}
518static DEVICE_ATTR_RO(phys_switch_id);
519
520static struct attribute *net_class_attrs[] __ro_after_init = {
521 &dev_attr_netdev_group.attr,
522 &dev_attr_type.attr,
523 &dev_attr_dev_id.attr,
524 &dev_attr_dev_port.attr,
525 &dev_attr_iflink.attr,
526 &dev_attr_ifindex.attr,
527 &dev_attr_name_assign_type.attr,
528 &dev_attr_addr_assign_type.attr,
529 &dev_attr_addr_len.attr,
530 &dev_attr_link_mode.attr,
531 &dev_attr_address.attr,
532 &dev_attr_broadcast.attr,
533 &dev_attr_speed.attr,
534 &dev_attr_duplex.attr,
535 &dev_attr_dormant.attr,
536 &dev_attr_operstate.attr,
537 &dev_attr_carrier_changes.attr,
538 &dev_attr_ifalias.attr,
539 &dev_attr_carrier.attr,
540 &dev_attr_mtu.attr,
541 &dev_attr_flags.attr,
542 &dev_attr_tx_queue_len.attr,
543 &dev_attr_gro_flush_timeout.attr,
544 &dev_attr_phys_port_id.attr,
545 &dev_attr_phys_port_name.attr,
546 &dev_attr_phys_switch_id.attr,
547 &dev_attr_proto_down.attr,
548 &dev_attr_carrier_up_count.attr,
549 &dev_attr_carrier_down_count.attr,
550 NULL,
551};
552ATTRIBUTE_GROUPS(net_class);
553
554/* Show a given an attribute in the statistics group */
555static ssize_t netstat_show(const struct device *d,
556 struct device_attribute *attr, char *buf,
557 unsigned long offset)
558{
559 struct net_device *dev = to_net_dev(d);
560 ssize_t ret = -EINVAL;
561
562 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
563 offset % sizeof(u64) != 0);
564
565 read_lock(&dev_base_lock);
566 if (dev_isalive(dev)) {
567 struct rtnl_link_stats64 temp;
568 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
569
570 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
571 }
572 read_unlock(&dev_base_lock);
573 return ret;
574}
575
576/* generate a read-only statistics attribute */
577#define NETSTAT_ENTRY(name) \
578static ssize_t name##_show(struct device *d, \
579 struct device_attribute *attr, char *buf) \
580{ \
581 return netstat_show(d, attr, buf, \
582 offsetof(struct rtnl_link_stats64, name)); \
583} \
584static DEVICE_ATTR_RO(name)
585
586NETSTAT_ENTRY(rx_packets);
587NETSTAT_ENTRY(tx_packets);
588NETSTAT_ENTRY(rx_bytes);
589NETSTAT_ENTRY(tx_bytes);
590NETSTAT_ENTRY(rx_errors);
591NETSTAT_ENTRY(tx_errors);
592NETSTAT_ENTRY(rx_dropped);
593NETSTAT_ENTRY(tx_dropped);
594NETSTAT_ENTRY(multicast);
595NETSTAT_ENTRY(collisions);
596NETSTAT_ENTRY(rx_length_errors);
597NETSTAT_ENTRY(rx_over_errors);
598NETSTAT_ENTRY(rx_crc_errors);
599NETSTAT_ENTRY(rx_frame_errors);
600NETSTAT_ENTRY(rx_fifo_errors);
601NETSTAT_ENTRY(rx_missed_errors);
602NETSTAT_ENTRY(tx_aborted_errors);
603NETSTAT_ENTRY(tx_carrier_errors);
604NETSTAT_ENTRY(tx_fifo_errors);
605NETSTAT_ENTRY(tx_heartbeat_errors);
606NETSTAT_ENTRY(tx_window_errors);
607NETSTAT_ENTRY(rx_compressed);
608NETSTAT_ENTRY(tx_compressed);
609NETSTAT_ENTRY(rx_nohandler);
610
611static struct attribute *netstat_attrs[] __ro_after_init = {
612 &dev_attr_rx_packets.attr,
613 &dev_attr_tx_packets.attr,
614 &dev_attr_rx_bytes.attr,
615 &dev_attr_tx_bytes.attr,
616 &dev_attr_rx_errors.attr,
617 &dev_attr_tx_errors.attr,
618 &dev_attr_rx_dropped.attr,
619 &dev_attr_tx_dropped.attr,
620 &dev_attr_multicast.attr,
621 &dev_attr_collisions.attr,
622 &dev_attr_rx_length_errors.attr,
623 &dev_attr_rx_over_errors.attr,
624 &dev_attr_rx_crc_errors.attr,
625 &dev_attr_rx_frame_errors.attr,
626 &dev_attr_rx_fifo_errors.attr,
627 &dev_attr_rx_missed_errors.attr,
628 &dev_attr_tx_aborted_errors.attr,
629 &dev_attr_tx_carrier_errors.attr,
630 &dev_attr_tx_fifo_errors.attr,
631 &dev_attr_tx_heartbeat_errors.attr,
632 &dev_attr_tx_window_errors.attr,
633 &dev_attr_rx_compressed.attr,
634 &dev_attr_tx_compressed.attr,
635 &dev_attr_rx_nohandler.attr,
636 NULL
637};
638
639static const struct attribute_group netstat_group = {
640 .name = "statistics",
641 .attrs = netstat_attrs,
642};
643
644#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
645static struct attribute *wireless_attrs[] = {
646 NULL
647};
648
649static const struct attribute_group wireless_group = {
650 .name = "wireless",
651 .attrs = wireless_attrs,
652};
653#endif
654
655#else /* CONFIG_SYSFS */
656#define net_class_groups NULL
657#endif /* CONFIG_SYSFS */
658
659#ifdef CONFIG_SYSFS
660#define to_rx_queue_attr(_attr) \
661 container_of(_attr, struct rx_queue_attribute, attr)
662
663#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
664
665static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
666 char *buf)
667{
668 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
669 struct netdev_rx_queue *queue = to_rx_queue(kobj);
670
671 if (!attribute->show)
672 return -EIO;
673
674 return attribute->show(queue, buf);
675}
676
677static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
678 const char *buf, size_t count)
679{
680 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
681 struct netdev_rx_queue *queue = to_rx_queue(kobj);
682
683 if (!attribute->store)
684 return -EIO;
685
686 return attribute->store(queue, buf, count);
687}
688
689static const struct sysfs_ops rx_queue_sysfs_ops = {
690 .show = rx_queue_attr_show,
691 .store = rx_queue_attr_store,
692};
693
694#ifdef CONFIG_RPS
695static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
696{
697 struct rps_map *map;
698 cpumask_var_t mask;
699 int i, len;
700
701 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
702 return -ENOMEM;
703
704 rcu_read_lock();
705 map = rcu_dereference(queue->rps_map);
706 if (map)
707 for (i = 0; i < map->len; i++)
708 cpumask_set_cpu(map->cpus[i], mask);
709
710 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
711 rcu_read_unlock();
712 free_cpumask_var(mask);
713
714 return len < PAGE_SIZE ? len : -EINVAL;
715}
716
717static ssize_t store_rps_map(struct netdev_rx_queue *queue,
718 const char *buf, size_t len)
719{
720 struct rps_map *old_map, *map;
721 cpumask_var_t mask;
722 int err, cpu, i;
723 static DEFINE_MUTEX(rps_map_mutex);
724
725 if (!capable(CAP_NET_ADMIN))
726 return -EPERM;
727
728 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
729 return -ENOMEM;
730
731 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
732 if (err) {
733 free_cpumask_var(mask);
734 return err;
735 }
736
737 map = kzalloc(max_t(unsigned int,
738 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
739 GFP_KERNEL);
740 if (!map) {
741 free_cpumask_var(mask);
742 return -ENOMEM;
743 }
744
745 i = 0;
746 for_each_cpu_and(cpu, mask, cpu_online_mask)
747 map->cpus[i++] = cpu;
748
749 if (i) {
750 map->len = i;
751 } else {
752 kfree(map);
753 map = NULL;
754 }
755
756 mutex_lock(&rps_map_mutex);
757 old_map = rcu_dereference_protected(queue->rps_map,
758 mutex_is_locked(&rps_map_mutex));
759 rcu_assign_pointer(queue->rps_map, map);
760
761 if (map)
762 static_key_slow_inc(&rps_needed);
763 if (old_map)
764 static_key_slow_dec(&rps_needed);
765
766 mutex_unlock(&rps_map_mutex);
767
768 if (old_map)
769 kfree_rcu(old_map, rcu);
770
771 free_cpumask_var(mask);
772 return len;
773}
774
775static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
776 char *buf)
777{
778 struct rps_dev_flow_table *flow_table;
779 unsigned long val = 0;
780
781 rcu_read_lock();
782 flow_table = rcu_dereference(queue->rps_flow_table);
783 if (flow_table)
784 val = (unsigned long)flow_table->mask + 1;
785 rcu_read_unlock();
786
787 return sprintf(buf, "%lu\n", val);
788}
789
790static void rps_dev_flow_table_release(struct rcu_head *rcu)
791{
792 struct rps_dev_flow_table *table = container_of(rcu,
793 struct rps_dev_flow_table, rcu);
794 vfree(table);
795}
796
797static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
798 const char *buf, size_t len)
799{
800 unsigned long mask, count;
801 struct rps_dev_flow_table *table, *old_table;
802 static DEFINE_SPINLOCK(rps_dev_flow_lock);
803 int rc;
804
805 if (!capable(CAP_NET_ADMIN))
806 return -EPERM;
807
808 rc = kstrtoul(buf, 0, &count);
809 if (rc < 0)
810 return rc;
811
812 if (count) {
813 mask = count - 1;
814 /* mask = roundup_pow_of_two(count) - 1;
815 * without overflows...
816 */
817 while ((mask | (mask >> 1)) != mask)
818 mask |= (mask >> 1);
819 /* On 64 bit arches, must check mask fits in table->mask (u32),
820 * and on 32bit arches, must check
821 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
822 */
823#if BITS_PER_LONG > 32
824 if (mask > (unsigned long)(u32)mask)
825 return -EINVAL;
826#else
827 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
828 / sizeof(struct rps_dev_flow)) {
829 /* Enforce a limit to prevent overflow */
830 return -EINVAL;
831 }
832#endif
833 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
834 if (!table)
835 return -ENOMEM;
836
837 table->mask = mask;
838 for (count = 0; count <= mask; count++)
839 table->flows[count].cpu = RPS_NO_CPU;
840 } else {
841 table = NULL;
842 }
843
844 spin_lock(&rps_dev_flow_lock);
845 old_table = rcu_dereference_protected(queue->rps_flow_table,
846 lockdep_is_held(&rps_dev_flow_lock));
847 rcu_assign_pointer(queue->rps_flow_table, table);
848 spin_unlock(&rps_dev_flow_lock);
849
850 if (old_table)
851 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
852
853 return len;
854}
855
856static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
857 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
858
859static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
860 = __ATTR(rps_flow_cnt, 0644,
861 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
862#endif /* CONFIG_RPS */
863
864static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
865#ifdef CONFIG_RPS
866 &rps_cpus_attribute.attr,
867 &rps_dev_flow_table_cnt_attribute.attr,
868#endif
869 NULL
870};
871
872static void rx_queue_release(struct kobject *kobj)
873{
874 struct netdev_rx_queue *queue = to_rx_queue(kobj);
875#ifdef CONFIG_RPS
876 struct rps_map *map;
877 struct rps_dev_flow_table *flow_table;
878
879 map = rcu_dereference_protected(queue->rps_map, 1);
880 if (map) {
881 RCU_INIT_POINTER(queue->rps_map, NULL);
882 kfree_rcu(map, rcu);
883 }
884
885 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
886 if (flow_table) {
887 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
888 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
889 }
890#endif
891
892 memset(kobj, 0, sizeof(*kobj));
893 dev_put(queue->dev);
894}
895
896static const void *rx_queue_namespace(struct kobject *kobj)
897{
898 struct netdev_rx_queue *queue = to_rx_queue(kobj);
899 struct device *dev = &queue->dev->dev;
900 const void *ns = NULL;
901
902 if (dev->class && dev->class->ns_type)
903 ns = dev->class->namespace(dev);
904
905 return ns;
906}
907
908static struct kobj_type rx_queue_ktype __ro_after_init = {
909 .sysfs_ops = &rx_queue_sysfs_ops,
910 .release = rx_queue_release,
911 .default_attrs = rx_queue_default_attrs,
912 .namespace = rx_queue_namespace
913};
914
915static int rx_queue_add_kobject(struct net_device *dev, int index)
916{
917 struct netdev_rx_queue *queue = dev->_rx + index;
918 struct kobject *kobj = &queue->kobj;
919 int error = 0;
920
921 kobj->kset = dev->queues_kset;
922 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
923 "rx-%u", index);
924 if (error)
925 return error;
926
927 if (dev->sysfs_rx_queue_group) {
928 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
929 if (error) {
930 kobject_put(kobj);
931 return error;
932 }
933 }
934
935 kobject_uevent(kobj, KOBJ_ADD);
936 dev_hold(queue->dev);
937
938 return error;
939}
940#endif /* CONFIG_SYSFS */
941
942int
943net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
944{
945#ifdef CONFIG_SYSFS
946 int i;
947 int error = 0;
948
949#ifndef CONFIG_RPS
950 if (!dev->sysfs_rx_queue_group)
951 return 0;
952#endif
953 for (i = old_num; i < new_num; i++) {
954 error = rx_queue_add_kobject(dev, i);
955 if (error) {
956 new_num = old_num;
957 break;
958 }
959 }
960
961 while (--i >= new_num) {
962 struct kobject *kobj = &dev->_rx[i].kobj;
963
964 if (!refcount_read(&dev_net(dev)->count))
965 kobj->uevent_suppress = 1;
966 if (dev->sysfs_rx_queue_group)
967 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
968 kobject_put(kobj);
969 }
970
971 return error;
972#else
973 return 0;
974#endif
975}
976
977#ifdef CONFIG_SYSFS
978/*
979 * netdev_queue sysfs structures and functions.
980 */
981struct netdev_queue_attribute {
982 struct attribute attr;
983 ssize_t (*show)(struct netdev_queue *queue, char *buf);
984 ssize_t (*store)(struct netdev_queue *queue,
985 const char *buf, size_t len);
986};
987#define to_netdev_queue_attr(_attr) \
988 container_of(_attr, struct netdev_queue_attribute, attr)
989
990#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
991
992static ssize_t netdev_queue_attr_show(struct kobject *kobj,
993 struct attribute *attr, char *buf)
994{
995 const struct netdev_queue_attribute *attribute
996 = to_netdev_queue_attr(attr);
997 struct netdev_queue *queue = to_netdev_queue(kobj);
998
999 if (!attribute->show)
1000 return -EIO;
1001
1002 return attribute->show(queue, buf);
1003}
1004
1005static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1006 struct attribute *attr,
1007 const char *buf, size_t count)
1008{
1009 const struct netdev_queue_attribute *attribute
1010 = to_netdev_queue_attr(attr);
1011 struct netdev_queue *queue = to_netdev_queue(kobj);
1012
1013 if (!attribute->store)
1014 return -EIO;
1015
1016 return attribute->store(queue, buf, count);
1017}
1018
1019static const struct sysfs_ops netdev_queue_sysfs_ops = {
1020 .show = netdev_queue_attr_show,
1021 .store = netdev_queue_attr_store,
1022};
1023
1024static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1025{
1026 unsigned long trans_timeout;
1027
1028 spin_lock_irq(&queue->_xmit_lock);
1029 trans_timeout = queue->trans_timeout;
1030 spin_unlock_irq(&queue->_xmit_lock);
1031
1032 return sprintf(buf, "%lu", trans_timeout);
1033}
1034
1035static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1036{
1037 struct net_device *dev = queue->dev;
1038 unsigned int i;
1039
1040 i = queue - dev->_tx;
1041 BUG_ON(i >= dev->num_tx_queues);
1042
1043 return i;
1044}
1045
1046static ssize_t traffic_class_show(struct netdev_queue *queue,
1047 char *buf)
1048{
1049 struct net_device *dev = queue->dev;
1050 int index = get_netdev_queue_index(queue);
1051 int tc = netdev_txq_to_tc(dev, index);
1052
1053 if (tc < 0)
1054 return -EINVAL;
1055
1056 return sprintf(buf, "%u\n", tc);
1057}
1058
1059#ifdef CONFIG_XPS
1060static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1061 char *buf)
1062{
1063 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1064}
1065
1066static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1067 const char *buf, size_t len)
1068{
1069 struct net_device *dev = queue->dev;
1070 int err, index = get_netdev_queue_index(queue);
1071 u32 rate = 0;
1072
1073 err = kstrtou32(buf, 10, &rate);
1074 if (err < 0)
1075 return err;
1076
1077 if (!rtnl_trylock())
1078 return restart_syscall();
1079
1080 err = -EOPNOTSUPP;
1081 if (dev->netdev_ops->ndo_set_tx_maxrate)
1082 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1083
1084 rtnl_unlock();
1085 if (!err) {
1086 queue->tx_maxrate = rate;
1087 return len;
1088 }
1089 return err;
1090}
1091
1092static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1093 = __ATTR_RW(tx_maxrate);
1094#endif
1095
1096static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1097 = __ATTR_RO(tx_timeout);
1098
1099static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1100 = __ATTR_RO(traffic_class);
1101
1102#ifdef CONFIG_BQL
1103/*
1104 * Byte queue limits sysfs structures and functions.
1105 */
1106static ssize_t bql_show(char *buf, unsigned int value)
1107{
1108 return sprintf(buf, "%u\n", value);
1109}
1110
1111static ssize_t bql_set(const char *buf, const size_t count,
1112 unsigned int *pvalue)
1113{
1114 unsigned int value;
1115 int err;
1116
1117 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1118 value = DQL_MAX_LIMIT;
1119 } else {
1120 err = kstrtouint(buf, 10, &value);
1121 if (err < 0)
1122 return err;
1123 if (value > DQL_MAX_LIMIT)
1124 return -EINVAL;
1125 }
1126
1127 *pvalue = value;
1128
1129 return count;
1130}
1131
1132static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1133 char *buf)
1134{
1135 struct dql *dql = &queue->dql;
1136
1137 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1138}
1139
1140static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1141 const char *buf, size_t len)
1142{
1143 struct dql *dql = &queue->dql;
1144 unsigned int value;
1145 int err;
1146
1147 err = kstrtouint(buf, 10, &value);
1148 if (err < 0)
1149 return err;
1150
1151 dql->slack_hold_time = msecs_to_jiffies(value);
1152
1153 return len;
1154}
1155
1156static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1157 = __ATTR(hold_time, 0644,
1158 bql_show_hold_time, bql_set_hold_time);
1159
1160static ssize_t bql_show_inflight(struct netdev_queue *queue,
1161 char *buf)
1162{
1163 struct dql *dql = &queue->dql;
1164
1165 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1166}
1167
1168static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1169 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1170
1171#define BQL_ATTR(NAME, FIELD) \
1172static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1173 char *buf) \
1174{ \
1175 return bql_show(buf, queue->dql.FIELD); \
1176} \
1177 \
1178static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1179 const char *buf, size_t len) \
1180{ \
1181 return bql_set(buf, len, &queue->dql.FIELD); \
1182} \
1183 \
1184static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1185 = __ATTR(NAME, 0644, \
1186 bql_show_ ## NAME, bql_set_ ## NAME)
1187
1188BQL_ATTR(limit, limit);
1189BQL_ATTR(limit_max, max_limit);
1190BQL_ATTR(limit_min, min_limit);
1191
1192static struct attribute *dql_attrs[] __ro_after_init = {
1193 &bql_limit_attribute.attr,
1194 &bql_limit_max_attribute.attr,
1195 &bql_limit_min_attribute.attr,
1196 &bql_hold_time_attribute.attr,
1197 &bql_inflight_attribute.attr,
1198 NULL
1199};
1200
1201static const struct attribute_group dql_group = {
1202 .name = "byte_queue_limits",
1203 .attrs = dql_attrs,
1204};
1205#endif /* CONFIG_BQL */
1206
1207#ifdef CONFIG_XPS
1208static ssize_t xps_cpus_show(struct netdev_queue *queue,
1209 char *buf)
1210{
1211 struct net_device *dev = queue->dev;
1212 int cpu, len, num_tc = 1, tc = 0;
1213 struct xps_dev_maps *dev_maps;
1214 cpumask_var_t mask;
1215 unsigned long index;
1216
1217 index = get_netdev_queue_index(queue);
1218
1219 if (dev->num_tc) {
1220 num_tc = dev->num_tc;
1221 tc = netdev_txq_to_tc(dev, index);
1222 if (tc < 0)
1223 return -EINVAL;
1224 }
1225
1226 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1227 return -ENOMEM;
1228
1229 rcu_read_lock();
1230 dev_maps = rcu_dereference(dev->xps_maps);
1231 if (dev_maps) {
1232 for_each_possible_cpu(cpu) {
1233 int i, tci = cpu * num_tc + tc;
1234 struct xps_map *map;
1235
1236 map = rcu_dereference(dev_maps->cpu_map[tci]);
1237 if (!map)
1238 continue;
1239
1240 for (i = map->len; i--;) {
1241 if (map->queues[i] == index) {
1242 cpumask_set_cpu(cpu, mask);
1243 break;
1244 }
1245 }
1246 }
1247 }
1248 rcu_read_unlock();
1249
1250 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1251 free_cpumask_var(mask);
1252 return len < PAGE_SIZE ? len : -EINVAL;
1253}
1254
1255static ssize_t xps_cpus_store(struct netdev_queue *queue,
1256 const char *buf, size_t len)
1257{
1258 struct net_device *dev = queue->dev;
1259 unsigned long index;
1260 cpumask_var_t mask;
1261 int err;
1262
1263 if (!capable(CAP_NET_ADMIN))
1264 return -EPERM;
1265
1266 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1267 return -ENOMEM;
1268
1269 index = get_netdev_queue_index(queue);
1270
1271 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1272 if (err) {
1273 free_cpumask_var(mask);
1274 return err;
1275 }
1276
1277 err = netif_set_xps_queue(dev, mask, index);
1278
1279 free_cpumask_var(mask);
1280
1281 return err ? : len;
1282}
1283
1284static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1285 = __ATTR_RW(xps_cpus);
1286#endif /* CONFIG_XPS */
1287
1288static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1289 &queue_trans_timeout.attr,
1290 &queue_traffic_class.attr,
1291#ifdef CONFIG_XPS
1292 &xps_cpus_attribute.attr,
1293 &queue_tx_maxrate.attr,
1294#endif
1295 NULL
1296};
1297
1298static void netdev_queue_release(struct kobject *kobj)
1299{
1300 struct netdev_queue *queue = to_netdev_queue(kobj);
1301
1302 memset(kobj, 0, sizeof(*kobj));
1303 dev_put(queue->dev);
1304}
1305
1306static const void *netdev_queue_namespace(struct kobject *kobj)
1307{
1308 struct netdev_queue *queue = to_netdev_queue(kobj);
1309 struct device *dev = &queue->dev->dev;
1310 const void *ns = NULL;
1311
1312 if (dev->class && dev->class->ns_type)
1313 ns = dev->class->namespace(dev);
1314
1315 return ns;
1316}
1317
1318static struct kobj_type netdev_queue_ktype __ro_after_init = {
1319 .sysfs_ops = &netdev_queue_sysfs_ops,
1320 .release = netdev_queue_release,
1321 .default_attrs = netdev_queue_default_attrs,
1322 .namespace = netdev_queue_namespace,
1323};
1324
1325static int netdev_queue_add_kobject(struct net_device *dev, int index)
1326{
1327 struct netdev_queue *queue = dev->_tx + index;
1328 struct kobject *kobj = &queue->kobj;
1329 int error = 0;
1330
1331 kobj->kset = dev->queues_kset;
1332 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1333 "tx-%u", index);
1334 if (error)
1335 return error;
1336
1337#ifdef CONFIG_BQL
1338 error = sysfs_create_group(kobj, &dql_group);
1339 if (error) {
1340 kobject_put(kobj);
1341 return error;
1342 }
1343#endif
1344
1345 kobject_uevent(kobj, KOBJ_ADD);
1346 dev_hold(queue->dev);
1347
1348 return 0;
1349}
1350#endif /* CONFIG_SYSFS */
1351
1352int
1353netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1354{
1355#ifdef CONFIG_SYSFS
1356 int i;
1357 int error = 0;
1358
1359 for (i = old_num; i < new_num; i++) {
1360 error = netdev_queue_add_kobject(dev, i);
1361 if (error) {
1362 new_num = old_num;
1363 break;
1364 }
1365 }
1366
1367 while (--i >= new_num) {
1368 struct netdev_queue *queue = dev->_tx + i;
1369
1370 if (!refcount_read(&dev_net(dev)->count))
1371 queue->kobj.uevent_suppress = 1;
1372#ifdef CONFIG_BQL
1373 sysfs_remove_group(&queue->kobj, &dql_group);
1374#endif
1375 kobject_put(&queue->kobj);
1376 }
1377
1378 return error;
1379#else
1380 return 0;
1381#endif /* CONFIG_SYSFS */
1382}
1383
1384static int register_queue_kobjects(struct net_device *dev)
1385{
1386 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1387
1388#ifdef CONFIG_SYSFS
1389 dev->queues_kset = kset_create_and_add("queues",
1390 NULL, &dev->dev.kobj);
1391 if (!dev->queues_kset)
1392 return -ENOMEM;
1393 real_rx = dev->real_num_rx_queues;
1394#endif
1395 real_tx = dev->real_num_tx_queues;
1396
1397 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1398 if (error)
1399 goto error;
1400 rxq = real_rx;
1401
1402 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1403 if (error)
1404 goto error;
1405 txq = real_tx;
1406
1407 return 0;
1408
1409error:
1410 netdev_queue_update_kobjects(dev, txq, 0);
1411 net_rx_queue_update_kobjects(dev, rxq, 0);
1412 return error;
1413}
1414
1415static void remove_queue_kobjects(struct net_device *dev)
1416{
1417 int real_rx = 0, real_tx = 0;
1418
1419#ifdef CONFIG_SYSFS
1420 real_rx = dev->real_num_rx_queues;
1421#endif
1422 real_tx = dev->real_num_tx_queues;
1423
1424 net_rx_queue_update_kobjects(dev, real_rx, 0);
1425 netdev_queue_update_kobjects(dev, real_tx, 0);
1426#ifdef CONFIG_SYSFS
1427 kset_unregister(dev->queues_kset);
1428#endif
1429}
1430
1431static bool net_current_may_mount(void)
1432{
1433 struct net *net = current->nsproxy->net_ns;
1434
1435 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1436}
1437
1438static void *net_grab_current_ns(void)
1439{
1440 struct net *ns = current->nsproxy->net_ns;
1441#ifdef CONFIG_NET_NS
1442 if (ns)
1443 refcount_inc(&ns->passive);
1444#endif
1445 return ns;
1446}
1447
1448static const void *net_initial_ns(void)
1449{
1450 return &init_net;
1451}
1452
1453static const void *net_netlink_ns(struct sock *sk)
1454{
1455 return sock_net(sk);
1456}
1457
1458const struct kobj_ns_type_operations net_ns_type_operations = {
1459 .type = KOBJ_NS_TYPE_NET,
1460 .current_may_mount = net_current_may_mount,
1461 .grab_current_ns = net_grab_current_ns,
1462 .netlink_ns = net_netlink_ns,
1463 .initial_ns = net_initial_ns,
1464 .drop_ns = net_drop_ns,
1465};
1466EXPORT_SYMBOL_GPL(net_ns_type_operations);
1467
1468static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1469{
1470 struct net_device *dev = to_net_dev(d);
1471 int retval;
1472
1473 /* pass interface to uevent. */
1474 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1475 if (retval)
1476 goto exit;
1477
1478 /* pass ifindex to uevent.
1479 * ifindex is useful as it won't change (interface name may change)
1480 * and is what RtNetlink uses natively.
1481 */
1482 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1483
1484exit:
1485 return retval;
1486}
1487
1488/*
1489 * netdev_release -- destroy and free a dead device.
1490 * Called when last reference to device kobject is gone.
1491 */
1492static void netdev_release(struct device *d)
1493{
1494 struct net_device *dev = to_net_dev(d);
1495
1496 BUG_ON(dev->reg_state != NETREG_RELEASED);
1497
1498 /* no need to wait for rcu grace period:
1499 * device is dead and about to be freed.
1500 */
1501 kfree(rcu_access_pointer(dev->ifalias));
1502 netdev_freemem(dev);
1503}
1504
1505static const void *net_namespace(struct device *d)
1506{
1507 struct net_device *dev = to_net_dev(d);
1508
1509 return dev_net(dev);
1510}
1511
1512static struct class net_class __ro_after_init = {
1513 .name = "net",
1514 .dev_release = netdev_release,
1515 .dev_groups = net_class_groups,
1516 .dev_uevent = netdev_uevent,
1517 .ns_type = &net_ns_type_operations,
1518 .namespace = net_namespace,
1519};
1520
1521#ifdef CONFIG_OF_NET
1522static int of_dev_node_match(struct device *dev, const void *data)
1523{
1524 int ret = 0;
1525
1526 if (dev->parent)
1527 ret = dev->parent->of_node == data;
1528
1529 return ret == 0 ? dev->of_node == data : ret;
1530}
1531
1532/*
1533 * of_find_net_device_by_node - lookup the net device for the device node
1534 * @np: OF device node
1535 *
1536 * Looks up the net_device structure corresponding with the device node.
1537 * If successful, returns a pointer to the net_device with the embedded
1538 * struct device refcount incremented by one, or NULL on failure. The
1539 * refcount must be dropped when done with the net_device.
1540 */
1541struct net_device *of_find_net_device_by_node(struct device_node *np)
1542{
1543 struct device *dev;
1544
1545 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1546 if (!dev)
1547 return NULL;
1548
1549 return to_net_dev(dev);
1550}
1551EXPORT_SYMBOL(of_find_net_device_by_node);
1552#endif
1553
1554/* Delete sysfs entries but hold kobject reference until after all
1555 * netdev references are gone.
1556 */
1557void netdev_unregister_kobject(struct net_device *ndev)
1558{
1559 struct device *dev = &ndev->dev;
1560
1561 if (!refcount_read(&dev_net(ndev)->count))
1562 dev_set_uevent_suppress(dev, 1);
1563
1564 kobject_get(&dev->kobj);
1565
1566 remove_queue_kobjects(ndev);
1567
1568 pm_runtime_set_memalloc_noio(dev, false);
1569
1570 device_del(dev);
1571}
1572
1573/* Create sysfs entries for network device. */
1574int netdev_register_kobject(struct net_device *ndev)
1575{
1576 struct device *dev = &ndev->dev;
1577 const struct attribute_group **groups = ndev->sysfs_groups;
1578 int error = 0;
1579
1580 device_initialize(dev);
1581 dev->class = &net_class;
1582 dev->platform_data = ndev;
1583 dev->groups = groups;
1584
1585 dev_set_name(dev, "%s", ndev->name);
1586
1587#ifdef CONFIG_SYSFS
1588 /* Allow for a device specific group */
1589 if (*groups)
1590 groups++;
1591
1592 *groups++ = &netstat_group;
1593
1594#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1595 if (ndev->ieee80211_ptr)
1596 *groups++ = &wireless_group;
1597#if IS_ENABLED(CONFIG_WIRELESS_EXT)
1598 else if (ndev->wireless_handlers)
1599 *groups++ = &wireless_group;
1600#endif
1601#endif
1602#endif /* CONFIG_SYSFS */
1603
1604 error = device_add(dev);
1605 if (error)
1606 return error;
1607
1608 error = register_queue_kobjects(ndev);
1609 if (error) {
1610 device_del(dev);
1611 return error;
1612 }
1613
1614 pm_runtime_set_memalloc_noio(dev, true);
1615
1616 return error;
1617}
1618
1619int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1620 const void *ns)
1621{
1622 return class_create_file_ns(&net_class, class_attr, ns);
1623}
1624EXPORT_SYMBOL(netdev_class_create_file_ns);
1625
1626void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1627 const void *ns)
1628{
1629 class_remove_file_ns(&net_class, class_attr, ns);
1630}
1631EXPORT_SYMBOL(netdev_class_remove_file_ns);
1632
1633int __init netdev_kobject_init(void)
1634{
1635 kobj_ns_type_register(&net_ns_type_operations);
1636 return class_register(&net_class);
1637}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net-sysfs.c - network device class and attributes
4 *
5 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
6 */
7
8#include <linux/capability.h>
9#include <linux/kernel.h>
10#include <linux/netdevice.h>
11#include <linux/if_arp.h>
12#include <linux/slab.h>
13#include <linux/sched/signal.h>
14#include <linux/sched/isolation.h>
15#include <linux/nsproxy.h>
16#include <net/sock.h>
17#include <net/net_namespace.h>
18#include <linux/rtnetlink.h>
19#include <linux/vmalloc.h>
20#include <linux/export.h>
21#include <linux/jiffies.h>
22#include <linux/pm_runtime.h>
23#include <linux/of.h>
24#include <linux/of_net.h>
25#include <linux/cpu.h>
26#include <net/netdev_rx_queue.h>
27#include <net/rps.h>
28
29#include "dev.h"
30#include "net-sysfs.h"
31
32#ifdef CONFIG_SYSFS
33static const char fmt_hex[] = "%#x\n";
34static const char fmt_dec[] = "%d\n";
35static const char fmt_uint[] = "%u\n";
36static const char fmt_ulong[] = "%lu\n";
37static const char fmt_u64[] = "%llu\n";
38
39/* Caller holds RTNL or RCU */
40static inline int dev_isalive(const struct net_device *dev)
41{
42 return READ_ONCE(dev->reg_state) <= NETREG_REGISTERED;
43}
44
45/* use same locking rules as GIF* ioctl's */
46static ssize_t netdev_show(const struct device *dev,
47 struct device_attribute *attr, char *buf,
48 ssize_t (*format)(const struct net_device *, char *))
49{
50 struct net_device *ndev = to_net_dev(dev);
51 ssize_t ret = -EINVAL;
52
53 rcu_read_lock();
54 if (dev_isalive(ndev))
55 ret = (*format)(ndev, buf);
56 rcu_read_unlock();
57
58 return ret;
59}
60
61/* generate a show function for simple field */
62#define NETDEVICE_SHOW(field, format_string) \
63static ssize_t format_##field(const struct net_device *dev, char *buf) \
64{ \
65 return sysfs_emit(buf, format_string, READ_ONCE(dev->field)); \
66} \
67static ssize_t field##_show(struct device *dev, \
68 struct device_attribute *attr, char *buf) \
69{ \
70 return netdev_show(dev, attr, buf, format_##field); \
71} \
72
73#define NETDEVICE_SHOW_RO(field, format_string) \
74NETDEVICE_SHOW(field, format_string); \
75static DEVICE_ATTR_RO(field)
76
77#define NETDEVICE_SHOW_RW(field, format_string) \
78NETDEVICE_SHOW(field, format_string); \
79static DEVICE_ATTR_RW(field)
80
81/* use same locking and permission rules as SIF* ioctl's */
82static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
83 const char *buf, size_t len,
84 int (*set)(struct net_device *, unsigned long))
85{
86 struct net_device *netdev = to_net_dev(dev);
87 struct net *net = dev_net(netdev);
88 unsigned long new;
89 int ret;
90
91 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
92 return -EPERM;
93
94 ret = kstrtoul(buf, 0, &new);
95 if (ret)
96 goto err;
97
98 if (!rtnl_trylock())
99 return restart_syscall();
100
101 if (dev_isalive(netdev)) {
102 ret = (*set)(netdev, new);
103 if (ret == 0)
104 ret = len;
105 }
106 rtnl_unlock();
107 err:
108 return ret;
109}
110
111NETDEVICE_SHOW_RO(dev_id, fmt_hex);
112NETDEVICE_SHOW_RO(dev_port, fmt_dec);
113NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
114NETDEVICE_SHOW_RO(addr_len, fmt_dec);
115NETDEVICE_SHOW_RO(ifindex, fmt_dec);
116NETDEVICE_SHOW_RO(type, fmt_dec);
117NETDEVICE_SHOW_RO(link_mode, fmt_dec);
118
119static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
120 char *buf)
121{
122 struct net_device *ndev = to_net_dev(dev);
123
124 return sysfs_emit(buf, fmt_dec, dev_get_iflink(ndev));
125}
126static DEVICE_ATTR_RO(iflink);
127
128static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
129{
130 return sysfs_emit(buf, fmt_dec, READ_ONCE(dev->name_assign_type));
131}
132
133static ssize_t name_assign_type_show(struct device *dev,
134 struct device_attribute *attr,
135 char *buf)
136{
137 struct net_device *ndev = to_net_dev(dev);
138 ssize_t ret = -EINVAL;
139
140 if (READ_ONCE(ndev->name_assign_type) != NET_NAME_UNKNOWN)
141 ret = netdev_show(dev, attr, buf, format_name_assign_type);
142
143 return ret;
144}
145static DEVICE_ATTR_RO(name_assign_type);
146
147/* use same locking rules as GIFHWADDR ioctl's (dev_get_mac_address()) */
148static ssize_t address_show(struct device *dev, struct device_attribute *attr,
149 char *buf)
150{
151 struct net_device *ndev = to_net_dev(dev);
152 ssize_t ret = -EINVAL;
153
154 down_read(&dev_addr_sem);
155
156 rcu_read_lock();
157 if (dev_isalive(ndev))
158 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
159 rcu_read_unlock();
160
161 up_read(&dev_addr_sem);
162 return ret;
163}
164static DEVICE_ATTR_RO(address);
165
166static ssize_t broadcast_show(struct device *dev,
167 struct device_attribute *attr, char *buf)
168{
169 struct net_device *ndev = to_net_dev(dev);
170 int ret = -EINVAL;
171
172 rcu_read_lock();
173 if (dev_isalive(ndev))
174 ret = sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
175 rcu_read_unlock();
176 return ret;
177}
178static DEVICE_ATTR_RO(broadcast);
179
180static int change_carrier(struct net_device *dev, unsigned long new_carrier)
181{
182 if (!netif_running(dev))
183 return -EINVAL;
184 return dev_change_carrier(dev, (bool)new_carrier);
185}
186
187static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
188 const char *buf, size_t len)
189{
190 struct net_device *netdev = to_net_dev(dev);
191
192 /* The check is also done in change_carrier; this helps returning early
193 * without hitting the trylock/restart in netdev_store.
194 */
195 if (!netdev->netdev_ops->ndo_change_carrier)
196 return -EOPNOTSUPP;
197
198 return netdev_store(dev, attr, buf, len, change_carrier);
199}
200
201static ssize_t carrier_show(struct device *dev,
202 struct device_attribute *attr, char *buf)
203{
204 struct net_device *netdev = to_net_dev(dev);
205 int ret = -EINVAL;
206
207 if (!rtnl_trylock())
208 return restart_syscall();
209
210 if (netif_running(netdev)) {
211 /* Synchronize carrier state with link watch,
212 * see also rtnl_getlink().
213 */
214 linkwatch_sync_dev(netdev);
215
216 ret = sysfs_emit(buf, fmt_dec, !!netif_carrier_ok(netdev));
217 }
218 rtnl_unlock();
219
220 return ret;
221}
222static DEVICE_ATTR_RW(carrier);
223
224static ssize_t speed_show(struct device *dev,
225 struct device_attribute *attr, char *buf)
226{
227 struct net_device *netdev = to_net_dev(dev);
228 int ret = -EINVAL;
229
230 /* The check is also done in __ethtool_get_link_ksettings; this helps
231 * returning early without hitting the trylock/restart below.
232 */
233 if (!netdev->ethtool_ops->get_link_ksettings)
234 return ret;
235
236 if (!rtnl_trylock())
237 return restart_syscall();
238
239 if (netif_running(netdev)) {
240 struct ethtool_link_ksettings cmd;
241
242 if (!__ethtool_get_link_ksettings(netdev, &cmd))
243 ret = sysfs_emit(buf, fmt_dec, cmd.base.speed);
244 }
245 rtnl_unlock();
246 return ret;
247}
248static DEVICE_ATTR_RO(speed);
249
250static ssize_t duplex_show(struct device *dev,
251 struct device_attribute *attr, char *buf)
252{
253 struct net_device *netdev = to_net_dev(dev);
254 int ret = -EINVAL;
255
256 /* The check is also done in __ethtool_get_link_ksettings; this helps
257 * returning early without hitting the trylock/restart below.
258 */
259 if (!netdev->ethtool_ops->get_link_ksettings)
260 return ret;
261
262 if (!rtnl_trylock())
263 return restart_syscall();
264
265 if (netif_running(netdev)) {
266 struct ethtool_link_ksettings cmd;
267
268 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
269 const char *duplex;
270
271 switch (cmd.base.duplex) {
272 case DUPLEX_HALF:
273 duplex = "half";
274 break;
275 case DUPLEX_FULL:
276 duplex = "full";
277 break;
278 default:
279 duplex = "unknown";
280 break;
281 }
282 ret = sysfs_emit(buf, "%s\n", duplex);
283 }
284 }
285 rtnl_unlock();
286 return ret;
287}
288static DEVICE_ATTR_RO(duplex);
289
290static ssize_t testing_show(struct device *dev,
291 struct device_attribute *attr, char *buf)
292{
293 struct net_device *netdev = to_net_dev(dev);
294
295 if (netif_running(netdev))
296 return sysfs_emit(buf, fmt_dec, !!netif_testing(netdev));
297
298 return -EINVAL;
299}
300static DEVICE_ATTR_RO(testing);
301
302static ssize_t dormant_show(struct device *dev,
303 struct device_attribute *attr, char *buf)
304{
305 struct net_device *netdev = to_net_dev(dev);
306
307 if (netif_running(netdev))
308 return sysfs_emit(buf, fmt_dec, !!netif_dormant(netdev));
309
310 return -EINVAL;
311}
312static DEVICE_ATTR_RO(dormant);
313
314static const char *const operstates[] = {
315 "unknown",
316 "notpresent", /* currently unused */
317 "down",
318 "lowerlayerdown",
319 "testing",
320 "dormant",
321 "up"
322};
323
324static ssize_t operstate_show(struct device *dev,
325 struct device_attribute *attr, char *buf)
326{
327 const struct net_device *netdev = to_net_dev(dev);
328 unsigned char operstate;
329
330 operstate = READ_ONCE(netdev->operstate);
331 if (!netif_running(netdev))
332 operstate = IF_OPER_DOWN;
333
334 if (operstate >= ARRAY_SIZE(operstates))
335 return -EINVAL; /* should not happen */
336
337 return sysfs_emit(buf, "%s\n", operstates[operstate]);
338}
339static DEVICE_ATTR_RO(operstate);
340
341static ssize_t carrier_changes_show(struct device *dev,
342 struct device_attribute *attr,
343 char *buf)
344{
345 struct net_device *netdev = to_net_dev(dev);
346
347 return sysfs_emit(buf, fmt_dec,
348 atomic_read(&netdev->carrier_up_count) +
349 atomic_read(&netdev->carrier_down_count));
350}
351static DEVICE_ATTR_RO(carrier_changes);
352
353static ssize_t carrier_up_count_show(struct device *dev,
354 struct device_attribute *attr,
355 char *buf)
356{
357 struct net_device *netdev = to_net_dev(dev);
358
359 return sysfs_emit(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
360}
361static DEVICE_ATTR_RO(carrier_up_count);
362
363static ssize_t carrier_down_count_show(struct device *dev,
364 struct device_attribute *attr,
365 char *buf)
366{
367 struct net_device *netdev = to_net_dev(dev);
368
369 return sysfs_emit(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
370}
371static DEVICE_ATTR_RO(carrier_down_count);
372
373/* read-write attributes */
374
375static int change_mtu(struct net_device *dev, unsigned long new_mtu)
376{
377 return dev_set_mtu(dev, (int)new_mtu);
378}
379
380static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
381 const char *buf, size_t len)
382{
383 return netdev_store(dev, attr, buf, len, change_mtu);
384}
385NETDEVICE_SHOW_RW(mtu, fmt_dec);
386
387static int change_flags(struct net_device *dev, unsigned long new_flags)
388{
389 return dev_change_flags(dev, (unsigned int)new_flags, NULL);
390}
391
392static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
393 const char *buf, size_t len)
394{
395 return netdev_store(dev, attr, buf, len, change_flags);
396}
397NETDEVICE_SHOW_RW(flags, fmt_hex);
398
399static ssize_t tx_queue_len_store(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf, size_t len)
402{
403 if (!capable(CAP_NET_ADMIN))
404 return -EPERM;
405
406 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
407}
408NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
409
410static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
411{
412 netdev_set_gro_flush_timeout(dev, val);
413 return 0;
414}
415
416static ssize_t gro_flush_timeout_store(struct device *dev,
417 struct device_attribute *attr,
418 const char *buf, size_t len)
419{
420 if (!capable(CAP_NET_ADMIN))
421 return -EPERM;
422
423 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
424}
425NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
426
427static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val)
428{
429 if (val > S32_MAX)
430 return -ERANGE;
431
432 netdev_set_defer_hard_irqs(dev, (u32)val);
433 return 0;
434}
435
436static ssize_t napi_defer_hard_irqs_store(struct device *dev,
437 struct device_attribute *attr,
438 const char *buf, size_t len)
439{
440 if (!capable(CAP_NET_ADMIN))
441 return -EPERM;
442
443 return netdev_store(dev, attr, buf, len, change_napi_defer_hard_irqs);
444}
445NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_uint);
446
447static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
448 const char *buf, size_t len)
449{
450 struct net_device *netdev = to_net_dev(dev);
451 struct net *net = dev_net(netdev);
452 size_t count = len;
453 ssize_t ret = 0;
454
455 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
456 return -EPERM;
457
458 /* ignore trailing newline */
459 if (len > 0 && buf[len - 1] == '\n')
460 --count;
461
462 if (!rtnl_trylock())
463 return restart_syscall();
464
465 if (dev_isalive(netdev)) {
466 ret = dev_set_alias(netdev, buf, count);
467 if (ret < 0)
468 goto err;
469 ret = len;
470 netdev_state_change(netdev);
471 }
472err:
473 rtnl_unlock();
474
475 return ret;
476}
477
478static ssize_t ifalias_show(struct device *dev,
479 struct device_attribute *attr, char *buf)
480{
481 const struct net_device *netdev = to_net_dev(dev);
482 char tmp[IFALIASZ];
483 ssize_t ret = 0;
484
485 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
486 if (ret > 0)
487 ret = sysfs_emit(buf, "%s\n", tmp);
488 return ret;
489}
490static DEVICE_ATTR_RW(ifalias);
491
492static int change_group(struct net_device *dev, unsigned long new_group)
493{
494 dev_set_group(dev, (int)new_group);
495 return 0;
496}
497
498static ssize_t group_store(struct device *dev, struct device_attribute *attr,
499 const char *buf, size_t len)
500{
501 return netdev_store(dev, attr, buf, len, change_group);
502}
503NETDEVICE_SHOW(group, fmt_dec);
504static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
505
506static int change_proto_down(struct net_device *dev, unsigned long proto_down)
507{
508 return dev_change_proto_down(dev, (bool)proto_down);
509}
510
511static ssize_t proto_down_store(struct device *dev,
512 struct device_attribute *attr,
513 const char *buf, size_t len)
514{
515 return netdev_store(dev, attr, buf, len, change_proto_down);
516}
517NETDEVICE_SHOW_RW(proto_down, fmt_dec);
518
519static ssize_t phys_port_id_show(struct device *dev,
520 struct device_attribute *attr, char *buf)
521{
522 struct net_device *netdev = to_net_dev(dev);
523 ssize_t ret = -EINVAL;
524
525 /* The check is also done in dev_get_phys_port_id; this helps returning
526 * early without hitting the trylock/restart below.
527 */
528 if (!netdev->netdev_ops->ndo_get_phys_port_id)
529 return -EOPNOTSUPP;
530
531 if (!rtnl_trylock())
532 return restart_syscall();
533
534 if (dev_isalive(netdev)) {
535 struct netdev_phys_item_id ppid;
536
537 ret = dev_get_phys_port_id(netdev, &ppid);
538 if (!ret)
539 ret = sysfs_emit(buf, "%*phN\n", ppid.id_len, ppid.id);
540 }
541 rtnl_unlock();
542
543 return ret;
544}
545static DEVICE_ATTR_RO(phys_port_id);
546
547static ssize_t phys_port_name_show(struct device *dev,
548 struct device_attribute *attr, char *buf)
549{
550 struct net_device *netdev = to_net_dev(dev);
551 ssize_t ret = -EINVAL;
552
553 /* The checks are also done in dev_get_phys_port_name; this helps
554 * returning early without hitting the trylock/restart below.
555 */
556 if (!netdev->netdev_ops->ndo_get_phys_port_name &&
557 !netdev->devlink_port)
558 return -EOPNOTSUPP;
559
560 if (!rtnl_trylock())
561 return restart_syscall();
562
563 if (dev_isalive(netdev)) {
564 char name[IFNAMSIZ];
565
566 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
567 if (!ret)
568 ret = sysfs_emit(buf, "%s\n", name);
569 }
570 rtnl_unlock();
571
572 return ret;
573}
574static DEVICE_ATTR_RO(phys_port_name);
575
576static ssize_t phys_switch_id_show(struct device *dev,
577 struct device_attribute *attr, char *buf)
578{
579 struct net_device *netdev = to_net_dev(dev);
580 ssize_t ret = -EINVAL;
581
582 /* The checks are also done in dev_get_phys_port_name; this helps
583 * returning early without hitting the trylock/restart below. This works
584 * because recurse is false when calling dev_get_port_parent_id.
585 */
586 if (!netdev->netdev_ops->ndo_get_port_parent_id &&
587 !netdev->devlink_port)
588 return -EOPNOTSUPP;
589
590 if (!rtnl_trylock())
591 return restart_syscall();
592
593 if (dev_isalive(netdev)) {
594 struct netdev_phys_item_id ppid = { };
595
596 ret = dev_get_port_parent_id(netdev, &ppid, false);
597 if (!ret)
598 ret = sysfs_emit(buf, "%*phN\n", ppid.id_len, ppid.id);
599 }
600 rtnl_unlock();
601
602 return ret;
603}
604static DEVICE_ATTR_RO(phys_switch_id);
605
606static ssize_t threaded_show(struct device *dev,
607 struct device_attribute *attr, char *buf)
608{
609 struct net_device *netdev = to_net_dev(dev);
610 ssize_t ret = -EINVAL;
611
612 rcu_read_lock();
613
614 if (dev_isalive(netdev))
615 ret = sysfs_emit(buf, fmt_dec, READ_ONCE(netdev->threaded));
616
617 rcu_read_unlock();
618
619 return ret;
620}
621
622static int modify_napi_threaded(struct net_device *dev, unsigned long val)
623{
624 int ret;
625
626 if (list_empty(&dev->napi_list))
627 return -EOPNOTSUPP;
628
629 if (val != 0 && val != 1)
630 return -EOPNOTSUPP;
631
632 ret = dev_set_threaded(dev, val);
633
634 return ret;
635}
636
637static ssize_t threaded_store(struct device *dev,
638 struct device_attribute *attr,
639 const char *buf, size_t len)
640{
641 return netdev_store(dev, attr, buf, len, modify_napi_threaded);
642}
643static DEVICE_ATTR_RW(threaded);
644
645static struct attribute *net_class_attrs[] __ro_after_init = {
646 &dev_attr_netdev_group.attr,
647 &dev_attr_type.attr,
648 &dev_attr_dev_id.attr,
649 &dev_attr_dev_port.attr,
650 &dev_attr_iflink.attr,
651 &dev_attr_ifindex.attr,
652 &dev_attr_name_assign_type.attr,
653 &dev_attr_addr_assign_type.attr,
654 &dev_attr_addr_len.attr,
655 &dev_attr_link_mode.attr,
656 &dev_attr_address.attr,
657 &dev_attr_broadcast.attr,
658 &dev_attr_speed.attr,
659 &dev_attr_duplex.attr,
660 &dev_attr_dormant.attr,
661 &dev_attr_testing.attr,
662 &dev_attr_operstate.attr,
663 &dev_attr_carrier_changes.attr,
664 &dev_attr_ifalias.attr,
665 &dev_attr_carrier.attr,
666 &dev_attr_mtu.attr,
667 &dev_attr_flags.attr,
668 &dev_attr_tx_queue_len.attr,
669 &dev_attr_gro_flush_timeout.attr,
670 &dev_attr_napi_defer_hard_irqs.attr,
671 &dev_attr_phys_port_id.attr,
672 &dev_attr_phys_port_name.attr,
673 &dev_attr_phys_switch_id.attr,
674 &dev_attr_proto_down.attr,
675 &dev_attr_carrier_up_count.attr,
676 &dev_attr_carrier_down_count.attr,
677 &dev_attr_threaded.attr,
678 NULL,
679};
680ATTRIBUTE_GROUPS(net_class);
681
682/* Show a given an attribute in the statistics group */
683static ssize_t netstat_show(const struct device *d,
684 struct device_attribute *attr, char *buf,
685 unsigned long offset)
686{
687 struct net_device *dev = to_net_dev(d);
688 ssize_t ret = -EINVAL;
689
690 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
691 offset % sizeof(u64) != 0);
692
693 rcu_read_lock();
694 if (dev_isalive(dev)) {
695 struct rtnl_link_stats64 temp;
696 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
697
698 ret = sysfs_emit(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
699 }
700 rcu_read_unlock();
701 return ret;
702}
703
704/* generate a read-only statistics attribute */
705#define NETSTAT_ENTRY(name) \
706static ssize_t name##_show(struct device *d, \
707 struct device_attribute *attr, char *buf) \
708{ \
709 return netstat_show(d, attr, buf, \
710 offsetof(struct rtnl_link_stats64, name)); \
711} \
712static DEVICE_ATTR_RO(name)
713
714NETSTAT_ENTRY(rx_packets);
715NETSTAT_ENTRY(tx_packets);
716NETSTAT_ENTRY(rx_bytes);
717NETSTAT_ENTRY(tx_bytes);
718NETSTAT_ENTRY(rx_errors);
719NETSTAT_ENTRY(tx_errors);
720NETSTAT_ENTRY(rx_dropped);
721NETSTAT_ENTRY(tx_dropped);
722NETSTAT_ENTRY(multicast);
723NETSTAT_ENTRY(collisions);
724NETSTAT_ENTRY(rx_length_errors);
725NETSTAT_ENTRY(rx_over_errors);
726NETSTAT_ENTRY(rx_crc_errors);
727NETSTAT_ENTRY(rx_frame_errors);
728NETSTAT_ENTRY(rx_fifo_errors);
729NETSTAT_ENTRY(rx_missed_errors);
730NETSTAT_ENTRY(tx_aborted_errors);
731NETSTAT_ENTRY(tx_carrier_errors);
732NETSTAT_ENTRY(tx_fifo_errors);
733NETSTAT_ENTRY(tx_heartbeat_errors);
734NETSTAT_ENTRY(tx_window_errors);
735NETSTAT_ENTRY(rx_compressed);
736NETSTAT_ENTRY(tx_compressed);
737NETSTAT_ENTRY(rx_nohandler);
738
739static struct attribute *netstat_attrs[] __ro_after_init = {
740 &dev_attr_rx_packets.attr,
741 &dev_attr_tx_packets.attr,
742 &dev_attr_rx_bytes.attr,
743 &dev_attr_tx_bytes.attr,
744 &dev_attr_rx_errors.attr,
745 &dev_attr_tx_errors.attr,
746 &dev_attr_rx_dropped.attr,
747 &dev_attr_tx_dropped.attr,
748 &dev_attr_multicast.attr,
749 &dev_attr_collisions.attr,
750 &dev_attr_rx_length_errors.attr,
751 &dev_attr_rx_over_errors.attr,
752 &dev_attr_rx_crc_errors.attr,
753 &dev_attr_rx_frame_errors.attr,
754 &dev_attr_rx_fifo_errors.attr,
755 &dev_attr_rx_missed_errors.attr,
756 &dev_attr_tx_aborted_errors.attr,
757 &dev_attr_tx_carrier_errors.attr,
758 &dev_attr_tx_fifo_errors.attr,
759 &dev_attr_tx_heartbeat_errors.attr,
760 &dev_attr_tx_window_errors.attr,
761 &dev_attr_rx_compressed.attr,
762 &dev_attr_tx_compressed.attr,
763 &dev_attr_rx_nohandler.attr,
764 NULL
765};
766
767static const struct attribute_group netstat_group = {
768 .name = "statistics",
769 .attrs = netstat_attrs,
770};
771
772static struct attribute *wireless_attrs[] = {
773 NULL
774};
775
776static const struct attribute_group wireless_group = {
777 .name = "wireless",
778 .attrs = wireless_attrs,
779};
780
781static bool wireless_group_needed(struct net_device *ndev)
782{
783#if IS_ENABLED(CONFIG_CFG80211)
784 if (ndev->ieee80211_ptr)
785 return true;
786#endif
787#if IS_ENABLED(CONFIG_WIRELESS_EXT)
788 if (ndev->wireless_handlers)
789 return true;
790#endif
791 return false;
792}
793
794#else /* CONFIG_SYSFS */
795#define net_class_groups NULL
796#endif /* CONFIG_SYSFS */
797
798#ifdef CONFIG_SYSFS
799#define to_rx_queue_attr(_attr) \
800 container_of(_attr, struct rx_queue_attribute, attr)
801
802#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
803
804static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
805 char *buf)
806{
807 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
808 struct netdev_rx_queue *queue = to_rx_queue(kobj);
809
810 if (!attribute->show)
811 return -EIO;
812
813 return attribute->show(queue, buf);
814}
815
816static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
817 const char *buf, size_t count)
818{
819 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
820 struct netdev_rx_queue *queue = to_rx_queue(kobj);
821
822 if (!attribute->store)
823 return -EIO;
824
825 return attribute->store(queue, buf, count);
826}
827
828static const struct sysfs_ops rx_queue_sysfs_ops = {
829 .show = rx_queue_attr_show,
830 .store = rx_queue_attr_store,
831};
832
833#ifdef CONFIG_RPS
834static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
835{
836 struct rps_map *map;
837 cpumask_var_t mask;
838 int i, len;
839
840 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
841 return -ENOMEM;
842
843 rcu_read_lock();
844 map = rcu_dereference(queue->rps_map);
845 if (map)
846 for (i = 0; i < map->len; i++)
847 cpumask_set_cpu(map->cpus[i], mask);
848
849 len = sysfs_emit(buf, "%*pb\n", cpumask_pr_args(mask));
850 rcu_read_unlock();
851 free_cpumask_var(mask);
852
853 return len < PAGE_SIZE ? len : -EINVAL;
854}
855
856static int netdev_rx_queue_set_rps_mask(struct netdev_rx_queue *queue,
857 cpumask_var_t mask)
858{
859 static DEFINE_MUTEX(rps_map_mutex);
860 struct rps_map *old_map, *map;
861 int cpu, i;
862
863 map = kzalloc(max_t(unsigned int,
864 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
865 GFP_KERNEL);
866 if (!map)
867 return -ENOMEM;
868
869 i = 0;
870 for_each_cpu_and(cpu, mask, cpu_online_mask)
871 map->cpus[i++] = cpu;
872
873 if (i) {
874 map->len = i;
875 } else {
876 kfree(map);
877 map = NULL;
878 }
879
880 mutex_lock(&rps_map_mutex);
881 old_map = rcu_dereference_protected(queue->rps_map,
882 mutex_is_locked(&rps_map_mutex));
883 rcu_assign_pointer(queue->rps_map, map);
884
885 if (map)
886 static_branch_inc(&rps_needed);
887 if (old_map)
888 static_branch_dec(&rps_needed);
889
890 mutex_unlock(&rps_map_mutex);
891
892 if (old_map)
893 kfree_rcu(old_map, rcu);
894 return 0;
895}
896
897int rps_cpumask_housekeeping(struct cpumask *mask)
898{
899 if (!cpumask_empty(mask)) {
900 cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_DOMAIN));
901 cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_WQ));
902 if (cpumask_empty(mask))
903 return -EINVAL;
904 }
905 return 0;
906}
907
908static ssize_t store_rps_map(struct netdev_rx_queue *queue,
909 const char *buf, size_t len)
910{
911 cpumask_var_t mask;
912 int err;
913
914 if (!capable(CAP_NET_ADMIN))
915 return -EPERM;
916
917 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
918 return -ENOMEM;
919
920 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
921 if (err)
922 goto out;
923
924 err = rps_cpumask_housekeeping(mask);
925 if (err)
926 goto out;
927
928 err = netdev_rx_queue_set_rps_mask(queue, mask);
929
930out:
931 free_cpumask_var(mask);
932 return err ? : len;
933}
934
935static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
936 char *buf)
937{
938 struct rps_dev_flow_table *flow_table;
939 unsigned long val = 0;
940
941 rcu_read_lock();
942 flow_table = rcu_dereference(queue->rps_flow_table);
943 if (flow_table)
944 val = (unsigned long)flow_table->mask + 1;
945 rcu_read_unlock();
946
947 return sysfs_emit(buf, "%lu\n", val);
948}
949
950static void rps_dev_flow_table_release(struct rcu_head *rcu)
951{
952 struct rps_dev_flow_table *table = container_of(rcu,
953 struct rps_dev_flow_table, rcu);
954 vfree(table);
955}
956
957static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
958 const char *buf, size_t len)
959{
960 unsigned long mask, count;
961 struct rps_dev_flow_table *table, *old_table;
962 static DEFINE_SPINLOCK(rps_dev_flow_lock);
963 int rc;
964
965 if (!capable(CAP_NET_ADMIN))
966 return -EPERM;
967
968 rc = kstrtoul(buf, 0, &count);
969 if (rc < 0)
970 return rc;
971
972 if (count) {
973 mask = count - 1;
974 /* mask = roundup_pow_of_two(count) - 1;
975 * without overflows...
976 */
977 while ((mask | (mask >> 1)) != mask)
978 mask |= (mask >> 1);
979 /* On 64 bit arches, must check mask fits in table->mask (u32),
980 * and on 32bit arches, must check
981 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
982 */
983#if BITS_PER_LONG > 32
984 if (mask > (unsigned long)(u32)mask)
985 return -EINVAL;
986#else
987 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
988 / sizeof(struct rps_dev_flow)) {
989 /* Enforce a limit to prevent overflow */
990 return -EINVAL;
991 }
992#endif
993 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
994 if (!table)
995 return -ENOMEM;
996
997 table->mask = mask;
998 for (count = 0; count <= mask; count++)
999 table->flows[count].cpu = RPS_NO_CPU;
1000 } else {
1001 table = NULL;
1002 }
1003
1004 spin_lock(&rps_dev_flow_lock);
1005 old_table = rcu_dereference_protected(queue->rps_flow_table,
1006 lockdep_is_held(&rps_dev_flow_lock));
1007 rcu_assign_pointer(queue->rps_flow_table, table);
1008 spin_unlock(&rps_dev_flow_lock);
1009
1010 if (old_table)
1011 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
1012
1013 return len;
1014}
1015
1016static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
1017 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
1018
1019static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
1020 = __ATTR(rps_flow_cnt, 0644,
1021 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
1022#endif /* CONFIG_RPS */
1023
1024static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
1025#ifdef CONFIG_RPS
1026 &rps_cpus_attribute.attr,
1027 &rps_dev_flow_table_cnt_attribute.attr,
1028#endif
1029 NULL
1030};
1031ATTRIBUTE_GROUPS(rx_queue_default);
1032
1033static void rx_queue_release(struct kobject *kobj)
1034{
1035 struct netdev_rx_queue *queue = to_rx_queue(kobj);
1036#ifdef CONFIG_RPS
1037 struct rps_map *map;
1038 struct rps_dev_flow_table *flow_table;
1039
1040 map = rcu_dereference_protected(queue->rps_map, 1);
1041 if (map) {
1042 RCU_INIT_POINTER(queue->rps_map, NULL);
1043 kfree_rcu(map, rcu);
1044 }
1045
1046 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
1047 if (flow_table) {
1048 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
1049 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
1050 }
1051#endif
1052
1053 memset(kobj, 0, sizeof(*kobj));
1054 netdev_put(queue->dev, &queue->dev_tracker);
1055}
1056
1057static const void *rx_queue_namespace(const struct kobject *kobj)
1058{
1059 struct netdev_rx_queue *queue = to_rx_queue(kobj);
1060 struct device *dev = &queue->dev->dev;
1061 const void *ns = NULL;
1062
1063 if (dev->class && dev->class->namespace)
1064 ns = dev->class->namespace(dev);
1065
1066 return ns;
1067}
1068
1069static void rx_queue_get_ownership(const struct kobject *kobj,
1070 kuid_t *uid, kgid_t *gid)
1071{
1072 const struct net *net = rx_queue_namespace(kobj);
1073
1074 net_ns_get_ownership(net, uid, gid);
1075}
1076
1077static const struct kobj_type rx_queue_ktype = {
1078 .sysfs_ops = &rx_queue_sysfs_ops,
1079 .release = rx_queue_release,
1080 .default_groups = rx_queue_default_groups,
1081 .namespace = rx_queue_namespace,
1082 .get_ownership = rx_queue_get_ownership,
1083};
1084
1085static int rx_queue_default_mask(struct net_device *dev,
1086 struct netdev_rx_queue *queue)
1087{
1088#if IS_ENABLED(CONFIG_RPS) && IS_ENABLED(CONFIG_SYSCTL)
1089 struct cpumask *rps_default_mask = READ_ONCE(dev_net(dev)->core.rps_default_mask);
1090
1091 if (rps_default_mask && !cpumask_empty(rps_default_mask))
1092 return netdev_rx_queue_set_rps_mask(queue, rps_default_mask);
1093#endif
1094 return 0;
1095}
1096
1097static int rx_queue_add_kobject(struct net_device *dev, int index)
1098{
1099 struct netdev_rx_queue *queue = dev->_rx + index;
1100 struct kobject *kobj = &queue->kobj;
1101 int error = 0;
1102
1103 /* Kobject_put later will trigger rx_queue_release call which
1104 * decreases dev refcount: Take that reference here
1105 */
1106 netdev_hold(queue->dev, &queue->dev_tracker, GFP_KERNEL);
1107
1108 kobj->kset = dev->queues_kset;
1109 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
1110 "rx-%u", index);
1111 if (error)
1112 goto err;
1113
1114 if (dev->sysfs_rx_queue_group) {
1115 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
1116 if (error)
1117 goto err;
1118 }
1119
1120 error = rx_queue_default_mask(dev, queue);
1121 if (error)
1122 goto err;
1123
1124 kobject_uevent(kobj, KOBJ_ADD);
1125
1126 return error;
1127
1128err:
1129 kobject_put(kobj);
1130 return error;
1131}
1132
1133static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
1134 kgid_t kgid)
1135{
1136 struct netdev_rx_queue *queue = dev->_rx + index;
1137 struct kobject *kobj = &queue->kobj;
1138 int error;
1139
1140 error = sysfs_change_owner(kobj, kuid, kgid);
1141 if (error)
1142 return error;
1143
1144 if (dev->sysfs_rx_queue_group)
1145 error = sysfs_group_change_owner(
1146 kobj, dev->sysfs_rx_queue_group, kuid, kgid);
1147
1148 return error;
1149}
1150#endif /* CONFIG_SYSFS */
1151
1152int
1153net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1154{
1155#ifdef CONFIG_SYSFS
1156 int i;
1157 int error = 0;
1158
1159#ifndef CONFIG_RPS
1160 if (!dev->sysfs_rx_queue_group)
1161 return 0;
1162#endif
1163 for (i = old_num; i < new_num; i++) {
1164 error = rx_queue_add_kobject(dev, i);
1165 if (error) {
1166 new_num = old_num;
1167 break;
1168 }
1169 }
1170
1171 while (--i >= new_num) {
1172 struct kobject *kobj = &dev->_rx[i].kobj;
1173
1174 if (!refcount_read(&dev_net(dev)->ns.count))
1175 kobj->uevent_suppress = 1;
1176 if (dev->sysfs_rx_queue_group)
1177 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
1178 kobject_put(kobj);
1179 }
1180
1181 return error;
1182#else
1183 return 0;
1184#endif
1185}
1186
1187static int net_rx_queue_change_owner(struct net_device *dev, int num,
1188 kuid_t kuid, kgid_t kgid)
1189{
1190#ifdef CONFIG_SYSFS
1191 int error = 0;
1192 int i;
1193
1194#ifndef CONFIG_RPS
1195 if (!dev->sysfs_rx_queue_group)
1196 return 0;
1197#endif
1198 for (i = 0; i < num; i++) {
1199 error = rx_queue_change_owner(dev, i, kuid, kgid);
1200 if (error)
1201 break;
1202 }
1203
1204 return error;
1205#else
1206 return 0;
1207#endif
1208}
1209
1210#ifdef CONFIG_SYSFS
1211/*
1212 * netdev_queue sysfs structures and functions.
1213 */
1214struct netdev_queue_attribute {
1215 struct attribute attr;
1216 ssize_t (*show)(struct netdev_queue *queue, char *buf);
1217 ssize_t (*store)(struct netdev_queue *queue,
1218 const char *buf, size_t len);
1219};
1220#define to_netdev_queue_attr(_attr) \
1221 container_of(_attr, struct netdev_queue_attribute, attr)
1222
1223#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1224
1225static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1226 struct attribute *attr, char *buf)
1227{
1228 const struct netdev_queue_attribute *attribute
1229 = to_netdev_queue_attr(attr);
1230 struct netdev_queue *queue = to_netdev_queue(kobj);
1231
1232 if (!attribute->show)
1233 return -EIO;
1234
1235 return attribute->show(queue, buf);
1236}
1237
1238static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1239 struct attribute *attr,
1240 const char *buf, size_t count)
1241{
1242 const struct netdev_queue_attribute *attribute
1243 = to_netdev_queue_attr(attr);
1244 struct netdev_queue *queue = to_netdev_queue(kobj);
1245
1246 if (!attribute->store)
1247 return -EIO;
1248
1249 return attribute->store(queue, buf, count);
1250}
1251
1252static const struct sysfs_ops netdev_queue_sysfs_ops = {
1253 .show = netdev_queue_attr_show,
1254 .store = netdev_queue_attr_store,
1255};
1256
1257static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1258{
1259 unsigned long trans_timeout = atomic_long_read(&queue->trans_timeout);
1260
1261 return sysfs_emit(buf, fmt_ulong, trans_timeout);
1262}
1263
1264static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1265{
1266 struct net_device *dev = queue->dev;
1267 unsigned int i;
1268
1269 i = queue - dev->_tx;
1270 BUG_ON(i >= dev->num_tx_queues);
1271
1272 return i;
1273}
1274
1275static ssize_t traffic_class_show(struct netdev_queue *queue,
1276 char *buf)
1277{
1278 struct net_device *dev = queue->dev;
1279 int num_tc, tc;
1280 int index;
1281
1282 if (!netif_is_multiqueue(dev))
1283 return -ENOENT;
1284
1285 if (!rtnl_trylock())
1286 return restart_syscall();
1287
1288 index = get_netdev_queue_index(queue);
1289
1290 /* If queue belongs to subordinate dev use its TC mapping */
1291 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1292
1293 num_tc = dev->num_tc;
1294 tc = netdev_txq_to_tc(dev, index);
1295
1296 rtnl_unlock();
1297
1298 if (tc < 0)
1299 return -EINVAL;
1300
1301 /* We can report the traffic class one of two ways:
1302 * Subordinate device traffic classes are reported with the traffic
1303 * class first, and then the subordinate class so for example TC0 on
1304 * subordinate device 2 will be reported as "0-2". If the queue
1305 * belongs to the root device it will be reported with just the
1306 * traffic class, so just "0" for TC 0 for example.
1307 */
1308 return num_tc < 0 ? sysfs_emit(buf, "%d%d\n", tc, num_tc) :
1309 sysfs_emit(buf, "%d\n", tc);
1310}
1311
1312#ifdef CONFIG_XPS
1313static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1314 char *buf)
1315{
1316 return sysfs_emit(buf, "%lu\n", queue->tx_maxrate);
1317}
1318
1319static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1320 const char *buf, size_t len)
1321{
1322 struct net_device *dev = queue->dev;
1323 int err, index = get_netdev_queue_index(queue);
1324 u32 rate = 0;
1325
1326 if (!capable(CAP_NET_ADMIN))
1327 return -EPERM;
1328
1329 /* The check is also done later; this helps returning early without
1330 * hitting the trylock/restart below.
1331 */
1332 if (!dev->netdev_ops->ndo_set_tx_maxrate)
1333 return -EOPNOTSUPP;
1334
1335 err = kstrtou32(buf, 10, &rate);
1336 if (err < 0)
1337 return err;
1338
1339 if (!rtnl_trylock())
1340 return restart_syscall();
1341
1342 err = -EOPNOTSUPP;
1343 if (dev->netdev_ops->ndo_set_tx_maxrate)
1344 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1345
1346 rtnl_unlock();
1347 if (!err) {
1348 queue->tx_maxrate = rate;
1349 return len;
1350 }
1351 return err;
1352}
1353
1354static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1355 = __ATTR_RW(tx_maxrate);
1356#endif
1357
1358static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1359 = __ATTR_RO(tx_timeout);
1360
1361static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1362 = __ATTR_RO(traffic_class);
1363
1364#ifdef CONFIG_BQL
1365/*
1366 * Byte queue limits sysfs structures and functions.
1367 */
1368static ssize_t bql_show(char *buf, unsigned int value)
1369{
1370 return sysfs_emit(buf, "%u\n", value);
1371}
1372
1373static ssize_t bql_set(const char *buf, const size_t count,
1374 unsigned int *pvalue)
1375{
1376 unsigned int value;
1377 int err;
1378
1379 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1380 value = DQL_MAX_LIMIT;
1381 } else {
1382 err = kstrtouint(buf, 10, &value);
1383 if (err < 0)
1384 return err;
1385 if (value > DQL_MAX_LIMIT)
1386 return -EINVAL;
1387 }
1388
1389 *pvalue = value;
1390
1391 return count;
1392}
1393
1394static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1395 char *buf)
1396{
1397 struct dql *dql = &queue->dql;
1398
1399 return sysfs_emit(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1400}
1401
1402static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1403 const char *buf, size_t len)
1404{
1405 struct dql *dql = &queue->dql;
1406 unsigned int value;
1407 int err;
1408
1409 err = kstrtouint(buf, 10, &value);
1410 if (err < 0)
1411 return err;
1412
1413 dql->slack_hold_time = msecs_to_jiffies(value);
1414
1415 return len;
1416}
1417
1418static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1419 = __ATTR(hold_time, 0644,
1420 bql_show_hold_time, bql_set_hold_time);
1421
1422static ssize_t bql_show_stall_thrs(struct netdev_queue *queue, char *buf)
1423{
1424 struct dql *dql = &queue->dql;
1425
1426 return sysfs_emit(buf, "%u\n", jiffies_to_msecs(dql->stall_thrs));
1427}
1428
1429static ssize_t bql_set_stall_thrs(struct netdev_queue *queue,
1430 const char *buf, size_t len)
1431{
1432 struct dql *dql = &queue->dql;
1433 unsigned int value;
1434 int err;
1435
1436 err = kstrtouint(buf, 10, &value);
1437 if (err < 0)
1438 return err;
1439
1440 value = msecs_to_jiffies(value);
1441 if (value && (value < 4 || value > 4 / 2 * BITS_PER_LONG))
1442 return -ERANGE;
1443
1444 if (!dql->stall_thrs && value)
1445 dql->last_reap = jiffies;
1446 /* Force last_reap to be live */
1447 smp_wmb();
1448 dql->stall_thrs = value;
1449
1450 return len;
1451}
1452
1453static struct netdev_queue_attribute bql_stall_thrs_attribute __ro_after_init =
1454 __ATTR(stall_thrs, 0644, bql_show_stall_thrs, bql_set_stall_thrs);
1455
1456static ssize_t bql_show_stall_max(struct netdev_queue *queue, char *buf)
1457{
1458 return sysfs_emit(buf, "%u\n", READ_ONCE(queue->dql.stall_max));
1459}
1460
1461static ssize_t bql_set_stall_max(struct netdev_queue *queue,
1462 const char *buf, size_t len)
1463{
1464 WRITE_ONCE(queue->dql.stall_max, 0);
1465 return len;
1466}
1467
1468static struct netdev_queue_attribute bql_stall_max_attribute __ro_after_init =
1469 __ATTR(stall_max, 0644, bql_show_stall_max, bql_set_stall_max);
1470
1471static ssize_t bql_show_stall_cnt(struct netdev_queue *queue, char *buf)
1472{
1473 struct dql *dql = &queue->dql;
1474
1475 return sysfs_emit(buf, "%lu\n", dql->stall_cnt);
1476}
1477
1478static struct netdev_queue_attribute bql_stall_cnt_attribute __ro_after_init =
1479 __ATTR(stall_cnt, 0444, bql_show_stall_cnt, NULL);
1480
1481static ssize_t bql_show_inflight(struct netdev_queue *queue,
1482 char *buf)
1483{
1484 struct dql *dql = &queue->dql;
1485
1486 return sysfs_emit(buf, "%u\n", dql->num_queued - dql->num_completed);
1487}
1488
1489static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1490 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1491
1492#define BQL_ATTR(NAME, FIELD) \
1493static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1494 char *buf) \
1495{ \
1496 return bql_show(buf, queue->dql.FIELD); \
1497} \
1498 \
1499static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1500 const char *buf, size_t len) \
1501{ \
1502 return bql_set(buf, len, &queue->dql.FIELD); \
1503} \
1504 \
1505static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1506 = __ATTR(NAME, 0644, \
1507 bql_show_ ## NAME, bql_set_ ## NAME)
1508
1509BQL_ATTR(limit, limit);
1510BQL_ATTR(limit_max, max_limit);
1511BQL_ATTR(limit_min, min_limit);
1512
1513static struct attribute *dql_attrs[] __ro_after_init = {
1514 &bql_limit_attribute.attr,
1515 &bql_limit_max_attribute.attr,
1516 &bql_limit_min_attribute.attr,
1517 &bql_hold_time_attribute.attr,
1518 &bql_inflight_attribute.attr,
1519 &bql_stall_thrs_attribute.attr,
1520 &bql_stall_cnt_attribute.attr,
1521 &bql_stall_max_attribute.attr,
1522 NULL
1523};
1524
1525static const struct attribute_group dql_group = {
1526 .name = "byte_queue_limits",
1527 .attrs = dql_attrs,
1528};
1529#else
1530/* Fake declaration, all the code using it should be dead */
1531static const struct attribute_group dql_group = {};
1532#endif /* CONFIG_BQL */
1533
1534#ifdef CONFIG_XPS
1535static ssize_t xps_queue_show(struct net_device *dev, unsigned int index,
1536 int tc, char *buf, enum xps_map_type type)
1537{
1538 struct xps_dev_maps *dev_maps;
1539 unsigned long *mask;
1540 unsigned int nr_ids;
1541 int j, len;
1542
1543 rcu_read_lock();
1544 dev_maps = rcu_dereference(dev->xps_maps[type]);
1545
1546 /* Default to nr_cpu_ids/dev->num_rx_queues and do not just return 0
1547 * when dev_maps hasn't been allocated yet, to be backward compatible.
1548 */
1549 nr_ids = dev_maps ? dev_maps->nr_ids :
1550 (type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues);
1551
1552 mask = bitmap_zalloc(nr_ids, GFP_NOWAIT);
1553 if (!mask) {
1554 rcu_read_unlock();
1555 return -ENOMEM;
1556 }
1557
1558 if (!dev_maps || tc >= dev_maps->num_tc)
1559 goto out_no_maps;
1560
1561 for (j = 0; j < nr_ids; j++) {
1562 int i, tci = j * dev_maps->num_tc + tc;
1563 struct xps_map *map;
1564
1565 map = rcu_dereference(dev_maps->attr_map[tci]);
1566 if (!map)
1567 continue;
1568
1569 for (i = map->len; i--;) {
1570 if (map->queues[i] == index) {
1571 __set_bit(j, mask);
1572 break;
1573 }
1574 }
1575 }
1576out_no_maps:
1577 rcu_read_unlock();
1578
1579 len = bitmap_print_to_pagebuf(false, buf, mask, nr_ids);
1580 bitmap_free(mask);
1581
1582 return len < PAGE_SIZE ? len : -EINVAL;
1583}
1584
1585static ssize_t xps_cpus_show(struct netdev_queue *queue, char *buf)
1586{
1587 struct net_device *dev = queue->dev;
1588 unsigned int index;
1589 int len, tc;
1590
1591 if (!netif_is_multiqueue(dev))
1592 return -ENOENT;
1593
1594 index = get_netdev_queue_index(queue);
1595
1596 if (!rtnl_trylock())
1597 return restart_syscall();
1598
1599 /* If queue belongs to subordinate dev use its map */
1600 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1601
1602 tc = netdev_txq_to_tc(dev, index);
1603 if (tc < 0) {
1604 rtnl_unlock();
1605 return -EINVAL;
1606 }
1607
1608 /* Make sure the subordinate device can't be freed */
1609 get_device(&dev->dev);
1610 rtnl_unlock();
1611
1612 len = xps_queue_show(dev, index, tc, buf, XPS_CPUS);
1613
1614 put_device(&dev->dev);
1615 return len;
1616}
1617
1618static ssize_t xps_cpus_store(struct netdev_queue *queue,
1619 const char *buf, size_t len)
1620{
1621 struct net_device *dev = queue->dev;
1622 unsigned int index;
1623 cpumask_var_t mask;
1624 int err;
1625
1626 if (!netif_is_multiqueue(dev))
1627 return -ENOENT;
1628
1629 if (!capable(CAP_NET_ADMIN))
1630 return -EPERM;
1631
1632 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1633 return -ENOMEM;
1634
1635 index = get_netdev_queue_index(queue);
1636
1637 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1638 if (err) {
1639 free_cpumask_var(mask);
1640 return err;
1641 }
1642
1643 if (!rtnl_trylock()) {
1644 free_cpumask_var(mask);
1645 return restart_syscall();
1646 }
1647
1648 err = netif_set_xps_queue(dev, mask, index);
1649 rtnl_unlock();
1650
1651 free_cpumask_var(mask);
1652
1653 return err ? : len;
1654}
1655
1656static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1657 = __ATTR_RW(xps_cpus);
1658
1659static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1660{
1661 struct net_device *dev = queue->dev;
1662 unsigned int index;
1663 int tc;
1664
1665 index = get_netdev_queue_index(queue);
1666
1667 if (!rtnl_trylock())
1668 return restart_syscall();
1669
1670 tc = netdev_txq_to_tc(dev, index);
1671 rtnl_unlock();
1672 if (tc < 0)
1673 return -EINVAL;
1674
1675 return xps_queue_show(dev, index, tc, buf, XPS_RXQS);
1676}
1677
1678static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1679 size_t len)
1680{
1681 struct net_device *dev = queue->dev;
1682 struct net *net = dev_net(dev);
1683 unsigned long *mask;
1684 unsigned int index;
1685 int err;
1686
1687 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1688 return -EPERM;
1689
1690 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1691 if (!mask)
1692 return -ENOMEM;
1693
1694 index = get_netdev_queue_index(queue);
1695
1696 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1697 if (err) {
1698 bitmap_free(mask);
1699 return err;
1700 }
1701
1702 if (!rtnl_trylock()) {
1703 bitmap_free(mask);
1704 return restart_syscall();
1705 }
1706
1707 cpus_read_lock();
1708 err = __netif_set_xps_queue(dev, mask, index, XPS_RXQS);
1709 cpus_read_unlock();
1710
1711 rtnl_unlock();
1712
1713 bitmap_free(mask);
1714 return err ? : len;
1715}
1716
1717static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1718 = __ATTR_RW(xps_rxqs);
1719#endif /* CONFIG_XPS */
1720
1721static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1722 &queue_trans_timeout.attr,
1723 &queue_traffic_class.attr,
1724#ifdef CONFIG_XPS
1725 &xps_cpus_attribute.attr,
1726 &xps_rxqs_attribute.attr,
1727 &queue_tx_maxrate.attr,
1728#endif
1729 NULL
1730};
1731ATTRIBUTE_GROUPS(netdev_queue_default);
1732
1733static void netdev_queue_release(struct kobject *kobj)
1734{
1735 struct netdev_queue *queue = to_netdev_queue(kobj);
1736
1737 memset(kobj, 0, sizeof(*kobj));
1738 netdev_put(queue->dev, &queue->dev_tracker);
1739}
1740
1741static const void *netdev_queue_namespace(const struct kobject *kobj)
1742{
1743 struct netdev_queue *queue = to_netdev_queue(kobj);
1744 struct device *dev = &queue->dev->dev;
1745 const void *ns = NULL;
1746
1747 if (dev->class && dev->class->namespace)
1748 ns = dev->class->namespace(dev);
1749
1750 return ns;
1751}
1752
1753static void netdev_queue_get_ownership(const struct kobject *kobj,
1754 kuid_t *uid, kgid_t *gid)
1755{
1756 const struct net *net = netdev_queue_namespace(kobj);
1757
1758 net_ns_get_ownership(net, uid, gid);
1759}
1760
1761static const struct kobj_type netdev_queue_ktype = {
1762 .sysfs_ops = &netdev_queue_sysfs_ops,
1763 .release = netdev_queue_release,
1764 .default_groups = netdev_queue_default_groups,
1765 .namespace = netdev_queue_namespace,
1766 .get_ownership = netdev_queue_get_ownership,
1767};
1768
1769static bool netdev_uses_bql(const struct net_device *dev)
1770{
1771 if (dev->lltx || (dev->priv_flags & IFF_NO_QUEUE))
1772 return false;
1773
1774 return IS_ENABLED(CONFIG_BQL);
1775}
1776
1777static int netdev_queue_add_kobject(struct net_device *dev, int index)
1778{
1779 struct netdev_queue *queue = dev->_tx + index;
1780 struct kobject *kobj = &queue->kobj;
1781 int error = 0;
1782
1783 /* Kobject_put later will trigger netdev_queue_release call
1784 * which decreases dev refcount: Take that reference here
1785 */
1786 netdev_hold(queue->dev, &queue->dev_tracker, GFP_KERNEL);
1787
1788 kobj->kset = dev->queues_kset;
1789 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1790 "tx-%u", index);
1791 if (error)
1792 goto err;
1793
1794 if (netdev_uses_bql(dev)) {
1795 error = sysfs_create_group(kobj, &dql_group);
1796 if (error)
1797 goto err;
1798 }
1799
1800 kobject_uevent(kobj, KOBJ_ADD);
1801 return 0;
1802
1803err:
1804 kobject_put(kobj);
1805 return error;
1806}
1807
1808static int tx_queue_change_owner(struct net_device *ndev, int index,
1809 kuid_t kuid, kgid_t kgid)
1810{
1811 struct netdev_queue *queue = ndev->_tx + index;
1812 struct kobject *kobj = &queue->kobj;
1813 int error;
1814
1815 error = sysfs_change_owner(kobj, kuid, kgid);
1816 if (error)
1817 return error;
1818
1819 if (netdev_uses_bql(ndev))
1820 error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
1821
1822 return error;
1823}
1824#endif /* CONFIG_SYSFS */
1825
1826int
1827netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1828{
1829#ifdef CONFIG_SYSFS
1830 int i;
1831 int error = 0;
1832
1833 /* Tx queue kobjects are allowed to be updated when a device is being
1834 * unregistered, but solely to remove queues from qdiscs. Any path
1835 * adding queues should be fixed.
1836 */
1837 WARN(dev->reg_state == NETREG_UNREGISTERING && new_num > old_num,
1838 "New queues can't be registered after device unregistration.");
1839
1840 for (i = old_num; i < new_num; i++) {
1841 error = netdev_queue_add_kobject(dev, i);
1842 if (error) {
1843 new_num = old_num;
1844 break;
1845 }
1846 }
1847
1848 while (--i >= new_num) {
1849 struct netdev_queue *queue = dev->_tx + i;
1850
1851 if (!refcount_read(&dev_net(dev)->ns.count))
1852 queue->kobj.uevent_suppress = 1;
1853
1854 if (netdev_uses_bql(dev))
1855 sysfs_remove_group(&queue->kobj, &dql_group);
1856
1857 kobject_put(&queue->kobj);
1858 }
1859
1860 return error;
1861#else
1862 return 0;
1863#endif /* CONFIG_SYSFS */
1864}
1865
1866static int net_tx_queue_change_owner(struct net_device *dev, int num,
1867 kuid_t kuid, kgid_t kgid)
1868{
1869#ifdef CONFIG_SYSFS
1870 int error = 0;
1871 int i;
1872
1873 for (i = 0; i < num; i++) {
1874 error = tx_queue_change_owner(dev, i, kuid, kgid);
1875 if (error)
1876 break;
1877 }
1878
1879 return error;
1880#else
1881 return 0;
1882#endif /* CONFIG_SYSFS */
1883}
1884
1885static int register_queue_kobjects(struct net_device *dev)
1886{
1887 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1888
1889#ifdef CONFIG_SYSFS
1890 dev->queues_kset = kset_create_and_add("queues",
1891 NULL, &dev->dev.kobj);
1892 if (!dev->queues_kset)
1893 return -ENOMEM;
1894 real_rx = dev->real_num_rx_queues;
1895#endif
1896 real_tx = dev->real_num_tx_queues;
1897
1898 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1899 if (error)
1900 goto error;
1901 rxq = real_rx;
1902
1903 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1904 if (error)
1905 goto error;
1906 txq = real_tx;
1907
1908 return 0;
1909
1910error:
1911 netdev_queue_update_kobjects(dev, txq, 0);
1912 net_rx_queue_update_kobjects(dev, rxq, 0);
1913#ifdef CONFIG_SYSFS
1914 kset_unregister(dev->queues_kset);
1915#endif
1916 return error;
1917}
1918
1919static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
1920{
1921 int error = 0, real_rx = 0, real_tx = 0;
1922
1923#ifdef CONFIG_SYSFS
1924 if (ndev->queues_kset) {
1925 error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
1926 if (error)
1927 return error;
1928 }
1929 real_rx = ndev->real_num_rx_queues;
1930#endif
1931 real_tx = ndev->real_num_tx_queues;
1932
1933 error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
1934 if (error)
1935 return error;
1936
1937 error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
1938 if (error)
1939 return error;
1940
1941 return 0;
1942}
1943
1944static void remove_queue_kobjects(struct net_device *dev)
1945{
1946 int real_rx = 0, real_tx = 0;
1947
1948#ifdef CONFIG_SYSFS
1949 real_rx = dev->real_num_rx_queues;
1950#endif
1951 real_tx = dev->real_num_tx_queues;
1952
1953 net_rx_queue_update_kobjects(dev, real_rx, 0);
1954 netdev_queue_update_kobjects(dev, real_tx, 0);
1955
1956 dev->real_num_rx_queues = 0;
1957 dev->real_num_tx_queues = 0;
1958#ifdef CONFIG_SYSFS
1959 kset_unregister(dev->queues_kset);
1960#endif
1961}
1962
1963static bool net_current_may_mount(void)
1964{
1965 struct net *net = current->nsproxy->net_ns;
1966
1967 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1968}
1969
1970static void *net_grab_current_ns(void)
1971{
1972 struct net *ns = current->nsproxy->net_ns;
1973#ifdef CONFIG_NET_NS
1974 if (ns)
1975 refcount_inc(&ns->passive);
1976#endif
1977 return ns;
1978}
1979
1980static const void *net_initial_ns(void)
1981{
1982 return &init_net;
1983}
1984
1985static const void *net_netlink_ns(struct sock *sk)
1986{
1987 return sock_net(sk);
1988}
1989
1990const struct kobj_ns_type_operations net_ns_type_operations = {
1991 .type = KOBJ_NS_TYPE_NET,
1992 .current_may_mount = net_current_may_mount,
1993 .grab_current_ns = net_grab_current_ns,
1994 .netlink_ns = net_netlink_ns,
1995 .initial_ns = net_initial_ns,
1996 .drop_ns = net_drop_ns,
1997};
1998EXPORT_SYMBOL_GPL(net_ns_type_operations);
1999
2000static int netdev_uevent(const struct device *d, struct kobj_uevent_env *env)
2001{
2002 const struct net_device *dev = to_net_dev(d);
2003 int retval;
2004
2005 /* pass interface to uevent. */
2006 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
2007 if (retval)
2008 goto exit;
2009
2010 /* pass ifindex to uevent.
2011 * ifindex is useful as it won't change (interface name may change)
2012 * and is what RtNetlink uses natively.
2013 */
2014 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
2015
2016exit:
2017 return retval;
2018}
2019
2020/*
2021 * netdev_release -- destroy and free a dead device.
2022 * Called when last reference to device kobject is gone.
2023 */
2024static void netdev_release(struct device *d)
2025{
2026 struct net_device *dev = to_net_dev(d);
2027
2028 BUG_ON(dev->reg_state != NETREG_RELEASED);
2029
2030 /* no need to wait for rcu grace period:
2031 * device is dead and about to be freed.
2032 */
2033 kfree(rcu_access_pointer(dev->ifalias));
2034 kvfree(dev);
2035}
2036
2037static const void *net_namespace(const struct device *d)
2038{
2039 const struct net_device *dev = to_net_dev(d);
2040
2041 return dev_net(dev);
2042}
2043
2044static void net_get_ownership(const struct device *d, kuid_t *uid, kgid_t *gid)
2045{
2046 const struct net_device *dev = to_net_dev(d);
2047 const struct net *net = dev_net(dev);
2048
2049 net_ns_get_ownership(net, uid, gid);
2050}
2051
2052static const struct class net_class = {
2053 .name = "net",
2054 .dev_release = netdev_release,
2055 .dev_groups = net_class_groups,
2056 .dev_uevent = netdev_uevent,
2057 .ns_type = &net_ns_type_operations,
2058 .namespace = net_namespace,
2059 .get_ownership = net_get_ownership,
2060};
2061
2062#ifdef CONFIG_OF
2063static int of_dev_node_match(struct device *dev, const void *data)
2064{
2065 for (; dev; dev = dev->parent) {
2066 if (dev->of_node == data)
2067 return 1;
2068 }
2069
2070 return 0;
2071}
2072
2073/*
2074 * of_find_net_device_by_node - lookup the net device for the device node
2075 * @np: OF device node
2076 *
2077 * Looks up the net_device structure corresponding with the device node.
2078 * If successful, returns a pointer to the net_device with the embedded
2079 * struct device refcount incremented by one, or NULL on failure. The
2080 * refcount must be dropped when done with the net_device.
2081 */
2082struct net_device *of_find_net_device_by_node(struct device_node *np)
2083{
2084 struct device *dev;
2085
2086 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
2087 if (!dev)
2088 return NULL;
2089
2090 return to_net_dev(dev);
2091}
2092EXPORT_SYMBOL(of_find_net_device_by_node);
2093#endif
2094
2095/* Delete sysfs entries but hold kobject reference until after all
2096 * netdev references are gone.
2097 */
2098void netdev_unregister_kobject(struct net_device *ndev)
2099{
2100 struct device *dev = &ndev->dev;
2101
2102 if (!refcount_read(&dev_net(ndev)->ns.count))
2103 dev_set_uevent_suppress(dev, 1);
2104
2105 kobject_get(&dev->kobj);
2106
2107 remove_queue_kobjects(ndev);
2108
2109 pm_runtime_set_memalloc_noio(dev, false);
2110
2111 device_del(dev);
2112}
2113
2114/* Create sysfs entries for network device. */
2115int netdev_register_kobject(struct net_device *ndev)
2116{
2117 struct device *dev = &ndev->dev;
2118 const struct attribute_group **groups = ndev->sysfs_groups;
2119 int error = 0;
2120
2121 device_initialize(dev);
2122 dev->class = &net_class;
2123 dev->platform_data = ndev;
2124 dev->groups = groups;
2125
2126 dev_set_name(dev, "%s", ndev->name);
2127
2128#ifdef CONFIG_SYSFS
2129 /* Allow for a device specific group */
2130 if (*groups)
2131 groups++;
2132
2133 *groups++ = &netstat_group;
2134
2135 if (wireless_group_needed(ndev))
2136 *groups++ = &wireless_group;
2137#endif /* CONFIG_SYSFS */
2138
2139 error = device_add(dev);
2140 if (error)
2141 return error;
2142
2143 error = register_queue_kobjects(ndev);
2144 if (error) {
2145 device_del(dev);
2146 return error;
2147 }
2148
2149 pm_runtime_set_memalloc_noio(dev, true);
2150
2151 return error;
2152}
2153
2154/* Change owner for sysfs entries when moving network devices across network
2155 * namespaces owned by different user namespaces.
2156 */
2157int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
2158 const struct net *net_new)
2159{
2160 kuid_t old_uid = GLOBAL_ROOT_UID, new_uid = GLOBAL_ROOT_UID;
2161 kgid_t old_gid = GLOBAL_ROOT_GID, new_gid = GLOBAL_ROOT_GID;
2162 struct device *dev = &ndev->dev;
2163 int error;
2164
2165 net_ns_get_ownership(net_old, &old_uid, &old_gid);
2166 net_ns_get_ownership(net_new, &new_uid, &new_gid);
2167
2168 /* The network namespace was changed but the owning user namespace is
2169 * identical so there's no need to change the owner of sysfs entries.
2170 */
2171 if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid))
2172 return 0;
2173
2174 error = device_change_owner(dev, new_uid, new_gid);
2175 if (error)
2176 return error;
2177
2178 error = queue_change_owner(ndev, new_uid, new_gid);
2179 if (error)
2180 return error;
2181
2182 return 0;
2183}
2184
2185int netdev_class_create_file_ns(const struct class_attribute *class_attr,
2186 const void *ns)
2187{
2188 return class_create_file_ns(&net_class, class_attr, ns);
2189}
2190EXPORT_SYMBOL(netdev_class_create_file_ns);
2191
2192void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
2193 const void *ns)
2194{
2195 class_remove_file_ns(&net_class, class_attr, ns);
2196}
2197EXPORT_SYMBOL(netdev_class_remove_file_ns);
2198
2199int __init netdev_kobject_init(void)
2200{
2201 kobj_ns_type_register(&net_ns_type_operations);
2202 return class_register(&net_class);
2203}