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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/nsproxy.h>
15#include <net/sock.h>
16#include <net/net_namespace.h>
17#include <linux/rtnetlink.h>
18#include <linux/vmalloc.h>
19#include <linux/export.h>
20#include <linux/jiffies.h>
21#include <linux/pm_runtime.h>
22#include <linux/of.h>
23#include <linux/of_net.h>
24#include <linux/cpu.h>
25
26#include "net-sysfs.h"
27
28#ifdef CONFIG_SYSFS
29static const char fmt_hex[] = "%#x\n";
30static const char fmt_dec[] = "%d\n";
31static const char fmt_ulong[] = "%lu\n";
32static const char fmt_u64[] = "%llu\n";
33
34static inline int dev_isalive(const struct net_device *dev)
35{
36 return dev->reg_state <= NETREG_REGISTERED;
37}
38
39/* use same locking rules as GIF* ioctl's */
40static ssize_t netdev_show(const struct device *dev,
41 struct device_attribute *attr, char *buf,
42 ssize_t (*format)(const struct net_device *, char *))
43{
44 struct net_device *ndev = to_net_dev(dev);
45 ssize_t ret = -EINVAL;
46
47 read_lock(&dev_base_lock);
48 if (dev_isalive(ndev))
49 ret = (*format)(ndev, buf);
50 read_unlock(&dev_base_lock);
51
52 return ret;
53}
54
55/* generate a show function for simple field */
56#define NETDEVICE_SHOW(field, format_string) \
57static ssize_t format_##field(const struct net_device *dev, char *buf) \
58{ \
59 return sprintf(buf, format_string, dev->field); \
60} \
61static ssize_t field##_show(struct device *dev, \
62 struct device_attribute *attr, char *buf) \
63{ \
64 return netdev_show(dev, attr, buf, format_##field); \
65} \
66
67#define NETDEVICE_SHOW_RO(field, format_string) \
68NETDEVICE_SHOW(field, format_string); \
69static DEVICE_ATTR_RO(field)
70
71#define NETDEVICE_SHOW_RW(field, format_string) \
72NETDEVICE_SHOW(field, format_string); \
73static DEVICE_ATTR_RW(field)
74
75/* use same locking and permission rules as SIF* ioctl's */
76static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
77 const char *buf, size_t len,
78 int (*set)(struct net_device *, unsigned long))
79{
80 struct net_device *netdev = to_net_dev(dev);
81 struct net *net = dev_net(netdev);
82 unsigned long new;
83 int ret = -EINVAL;
84
85 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
86 return -EPERM;
87
88 ret = kstrtoul(buf, 0, &new);
89 if (ret)
90 goto err;
91
92 if (!rtnl_trylock())
93 return restart_syscall();
94
95 if (dev_isalive(netdev)) {
96 ret = (*set)(netdev, new);
97 if (ret == 0)
98 ret = len;
99 }
100 rtnl_unlock();
101 err:
102 return ret;
103}
104
105NETDEVICE_SHOW_RO(dev_id, fmt_hex);
106NETDEVICE_SHOW_RO(dev_port, fmt_dec);
107NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
108NETDEVICE_SHOW_RO(addr_len, fmt_dec);
109NETDEVICE_SHOW_RO(ifindex, fmt_dec);
110NETDEVICE_SHOW_RO(type, fmt_dec);
111NETDEVICE_SHOW_RO(link_mode, fmt_dec);
112
113static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
114 char *buf)
115{
116 struct net_device *ndev = to_net_dev(dev);
117
118 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
119}
120static DEVICE_ATTR_RO(iflink);
121
122static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
123{
124 return sprintf(buf, fmt_dec, dev->name_assign_type);
125}
126
127static ssize_t name_assign_type_show(struct device *dev,
128 struct device_attribute *attr,
129 char *buf)
130{
131 struct net_device *ndev = to_net_dev(dev);
132 ssize_t ret = -EINVAL;
133
134 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
135 ret = netdev_show(dev, attr, buf, format_name_assign_type);
136
137 return ret;
138}
139static DEVICE_ATTR_RO(name_assign_type);
140
141/* use same locking rules as GIFHWADDR ioctl's */
142static ssize_t address_show(struct device *dev, struct device_attribute *attr,
143 char *buf)
144{
145 struct net_device *ndev = to_net_dev(dev);
146 ssize_t ret = -EINVAL;
147
148 read_lock(&dev_base_lock);
149 if (dev_isalive(ndev))
150 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
151 read_unlock(&dev_base_lock);
152 return ret;
153}
154static DEVICE_ATTR_RO(address);
155
156static ssize_t broadcast_show(struct device *dev,
157 struct device_attribute *attr, char *buf)
158{
159 struct net_device *ndev = to_net_dev(dev);
160
161 if (dev_isalive(ndev))
162 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
163 return -EINVAL;
164}
165static DEVICE_ATTR_RO(broadcast);
166
167static int change_carrier(struct net_device *dev, unsigned long new_carrier)
168{
169 if (!netif_running(dev))
170 return -EINVAL;
171 return dev_change_carrier(dev, (bool)new_carrier);
172}
173
174static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
175 const char *buf, size_t len)
176{
177 return netdev_store(dev, attr, buf, len, change_carrier);
178}
179
180static ssize_t carrier_show(struct device *dev,
181 struct device_attribute *attr, char *buf)
182{
183 struct net_device *netdev = to_net_dev(dev);
184
185 if (netif_running(netdev))
186 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
187
188 return -EINVAL;
189}
190static DEVICE_ATTR_RW(carrier);
191
192static ssize_t speed_show(struct device *dev,
193 struct device_attribute *attr, char *buf)
194{
195 struct net_device *netdev = to_net_dev(dev);
196 int ret = -EINVAL;
197
198 if (!rtnl_trylock())
199 return restart_syscall();
200
201 if (netif_running(netdev)) {
202 struct ethtool_link_ksettings cmd;
203
204 if (!__ethtool_get_link_ksettings(netdev, &cmd))
205 ret = sprintf(buf, fmt_dec, cmd.base.speed);
206 }
207 rtnl_unlock();
208 return ret;
209}
210static DEVICE_ATTR_RO(speed);
211
212static ssize_t duplex_show(struct device *dev,
213 struct device_attribute *attr, char *buf)
214{
215 struct net_device *netdev = to_net_dev(dev);
216 int ret = -EINVAL;
217
218 if (!rtnl_trylock())
219 return restart_syscall();
220
221 if (netif_running(netdev)) {
222 struct ethtool_link_ksettings cmd;
223
224 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
225 const char *duplex;
226
227 switch (cmd.base.duplex) {
228 case DUPLEX_HALF:
229 duplex = "half";
230 break;
231 case DUPLEX_FULL:
232 duplex = "full";
233 break;
234 default:
235 duplex = "unknown";
236 break;
237 }
238 ret = sprintf(buf, "%s\n", duplex);
239 }
240 }
241 rtnl_unlock();
242 return ret;
243}
244static DEVICE_ATTR_RO(duplex);
245
246static ssize_t dormant_show(struct device *dev,
247 struct device_attribute *attr, char *buf)
248{
249 struct net_device *netdev = to_net_dev(dev);
250
251 if (netif_running(netdev))
252 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
253
254 return -EINVAL;
255}
256static DEVICE_ATTR_RO(dormant);
257
258static const char *const operstates[] = {
259 "unknown",
260 "notpresent", /* currently unused */
261 "down",
262 "lowerlayerdown",
263 "testing", /* currently unused */
264 "dormant",
265 "up"
266};
267
268static ssize_t operstate_show(struct device *dev,
269 struct device_attribute *attr, char *buf)
270{
271 const struct net_device *netdev = to_net_dev(dev);
272 unsigned char operstate;
273
274 read_lock(&dev_base_lock);
275 operstate = netdev->operstate;
276 if (!netif_running(netdev))
277 operstate = IF_OPER_DOWN;
278 read_unlock(&dev_base_lock);
279
280 if (operstate >= ARRAY_SIZE(operstates))
281 return -EINVAL; /* should not happen */
282
283 return sprintf(buf, "%s\n", operstates[operstate]);
284}
285static DEVICE_ATTR_RO(operstate);
286
287static ssize_t carrier_changes_show(struct device *dev,
288 struct device_attribute *attr,
289 char *buf)
290{
291 struct net_device *netdev = to_net_dev(dev);
292
293 return sprintf(buf, fmt_dec,
294 atomic_read(&netdev->carrier_up_count) +
295 atomic_read(&netdev->carrier_down_count));
296}
297static DEVICE_ATTR_RO(carrier_changes);
298
299static ssize_t carrier_up_count_show(struct device *dev,
300 struct device_attribute *attr,
301 char *buf)
302{
303 struct net_device *netdev = to_net_dev(dev);
304
305 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
306}
307static DEVICE_ATTR_RO(carrier_up_count);
308
309static ssize_t carrier_down_count_show(struct device *dev,
310 struct device_attribute *attr,
311 char *buf)
312{
313 struct net_device *netdev = to_net_dev(dev);
314
315 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
316}
317static DEVICE_ATTR_RO(carrier_down_count);
318
319/* read-write attributes */
320
321static int change_mtu(struct net_device *dev, unsigned long new_mtu)
322{
323 return dev_set_mtu(dev, (int)new_mtu);
324}
325
326static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
327 const char *buf, size_t len)
328{
329 return netdev_store(dev, attr, buf, len, change_mtu);
330}
331NETDEVICE_SHOW_RW(mtu, fmt_dec);
332
333static int change_flags(struct net_device *dev, unsigned long new_flags)
334{
335 return dev_change_flags(dev, (unsigned int)new_flags, NULL);
336}
337
338static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
339 const char *buf, size_t len)
340{
341 return netdev_store(dev, attr, buf, len, change_flags);
342}
343NETDEVICE_SHOW_RW(flags, fmt_hex);
344
345static ssize_t tx_queue_len_store(struct device *dev,
346 struct device_attribute *attr,
347 const char *buf, size_t len)
348{
349 if (!capable(CAP_NET_ADMIN))
350 return -EPERM;
351
352 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
353}
354NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
355
356static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
357{
358 dev->gro_flush_timeout = val;
359 return 0;
360}
361
362static ssize_t gro_flush_timeout_store(struct device *dev,
363 struct device_attribute *attr,
364 const char *buf, size_t len)
365{
366 if (!capable(CAP_NET_ADMIN))
367 return -EPERM;
368
369 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
370}
371NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
372
373static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
374 const char *buf, size_t len)
375{
376 struct net_device *netdev = to_net_dev(dev);
377 struct net *net = dev_net(netdev);
378 size_t count = len;
379 ssize_t ret = 0;
380
381 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
382 return -EPERM;
383
384 /* ignore trailing newline */
385 if (len > 0 && buf[len - 1] == '\n')
386 --count;
387
388 if (!rtnl_trylock())
389 return restart_syscall();
390
391 if (dev_isalive(netdev)) {
392 ret = dev_set_alias(netdev, buf, count);
393 if (ret < 0)
394 goto err;
395 ret = len;
396 netdev_state_change(netdev);
397 }
398err:
399 rtnl_unlock();
400
401 return ret;
402}
403
404static ssize_t ifalias_show(struct device *dev,
405 struct device_attribute *attr, char *buf)
406{
407 const struct net_device *netdev = to_net_dev(dev);
408 char tmp[IFALIASZ];
409 ssize_t ret = 0;
410
411 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
412 if (ret > 0)
413 ret = sprintf(buf, "%s\n", tmp);
414 return ret;
415}
416static DEVICE_ATTR_RW(ifalias);
417
418static int change_group(struct net_device *dev, unsigned long new_group)
419{
420 dev_set_group(dev, (int)new_group);
421 return 0;
422}
423
424static ssize_t group_store(struct device *dev, struct device_attribute *attr,
425 const char *buf, size_t len)
426{
427 return netdev_store(dev, attr, buf, len, change_group);
428}
429NETDEVICE_SHOW(group, fmt_dec);
430static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
431
432static int change_proto_down(struct net_device *dev, unsigned long proto_down)
433{
434 return dev_change_proto_down(dev, (bool)proto_down);
435}
436
437static ssize_t proto_down_store(struct device *dev,
438 struct device_attribute *attr,
439 const char *buf, size_t len)
440{
441 return netdev_store(dev, attr, buf, len, change_proto_down);
442}
443NETDEVICE_SHOW_RW(proto_down, fmt_dec);
444
445static ssize_t phys_port_id_show(struct device *dev,
446 struct device_attribute *attr, char *buf)
447{
448 struct net_device *netdev = to_net_dev(dev);
449 ssize_t ret = -EINVAL;
450
451 if (!rtnl_trylock())
452 return restart_syscall();
453
454 if (dev_isalive(netdev)) {
455 struct netdev_phys_item_id ppid;
456
457 ret = dev_get_phys_port_id(netdev, &ppid);
458 if (!ret)
459 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
460 }
461 rtnl_unlock();
462
463 return ret;
464}
465static DEVICE_ATTR_RO(phys_port_id);
466
467static ssize_t phys_port_name_show(struct device *dev,
468 struct device_attribute *attr, char *buf)
469{
470 struct net_device *netdev = to_net_dev(dev);
471 ssize_t ret = -EINVAL;
472
473 if (!rtnl_trylock())
474 return restart_syscall();
475
476 if (dev_isalive(netdev)) {
477 char name[IFNAMSIZ];
478
479 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
480 if (!ret)
481 ret = sprintf(buf, "%s\n", name);
482 }
483 rtnl_unlock();
484
485 return ret;
486}
487static DEVICE_ATTR_RO(phys_port_name);
488
489static ssize_t phys_switch_id_show(struct device *dev,
490 struct device_attribute *attr, char *buf)
491{
492 struct net_device *netdev = to_net_dev(dev);
493 ssize_t ret = -EINVAL;
494
495 if (!rtnl_trylock())
496 return restart_syscall();
497
498 if (dev_isalive(netdev)) {
499 struct netdev_phys_item_id ppid = { };
500
501 ret = dev_get_port_parent_id(netdev, &ppid, false);
502 if (!ret)
503 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
504 }
505 rtnl_unlock();
506
507 return ret;
508}
509static DEVICE_ATTR_RO(phys_switch_id);
510
511static struct attribute *net_class_attrs[] __ro_after_init = {
512 &dev_attr_netdev_group.attr,
513 &dev_attr_type.attr,
514 &dev_attr_dev_id.attr,
515 &dev_attr_dev_port.attr,
516 &dev_attr_iflink.attr,
517 &dev_attr_ifindex.attr,
518 &dev_attr_name_assign_type.attr,
519 &dev_attr_addr_assign_type.attr,
520 &dev_attr_addr_len.attr,
521 &dev_attr_link_mode.attr,
522 &dev_attr_address.attr,
523 &dev_attr_broadcast.attr,
524 &dev_attr_speed.attr,
525 &dev_attr_duplex.attr,
526 &dev_attr_dormant.attr,
527 &dev_attr_operstate.attr,
528 &dev_attr_carrier_changes.attr,
529 &dev_attr_ifalias.attr,
530 &dev_attr_carrier.attr,
531 &dev_attr_mtu.attr,
532 &dev_attr_flags.attr,
533 &dev_attr_tx_queue_len.attr,
534 &dev_attr_gro_flush_timeout.attr,
535 &dev_attr_phys_port_id.attr,
536 &dev_attr_phys_port_name.attr,
537 &dev_attr_phys_switch_id.attr,
538 &dev_attr_proto_down.attr,
539 &dev_attr_carrier_up_count.attr,
540 &dev_attr_carrier_down_count.attr,
541 NULL,
542};
543ATTRIBUTE_GROUPS(net_class);
544
545/* Show a given an attribute in the statistics group */
546static ssize_t netstat_show(const struct device *d,
547 struct device_attribute *attr, char *buf,
548 unsigned long offset)
549{
550 struct net_device *dev = to_net_dev(d);
551 ssize_t ret = -EINVAL;
552
553 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
554 offset % sizeof(u64) != 0);
555
556 read_lock(&dev_base_lock);
557 if (dev_isalive(dev)) {
558 struct rtnl_link_stats64 temp;
559 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
560
561 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
562 }
563 read_unlock(&dev_base_lock);
564 return ret;
565}
566
567/* generate a read-only statistics attribute */
568#define NETSTAT_ENTRY(name) \
569static ssize_t name##_show(struct device *d, \
570 struct device_attribute *attr, char *buf) \
571{ \
572 return netstat_show(d, attr, buf, \
573 offsetof(struct rtnl_link_stats64, name)); \
574} \
575static DEVICE_ATTR_RO(name)
576
577NETSTAT_ENTRY(rx_packets);
578NETSTAT_ENTRY(tx_packets);
579NETSTAT_ENTRY(rx_bytes);
580NETSTAT_ENTRY(tx_bytes);
581NETSTAT_ENTRY(rx_errors);
582NETSTAT_ENTRY(tx_errors);
583NETSTAT_ENTRY(rx_dropped);
584NETSTAT_ENTRY(tx_dropped);
585NETSTAT_ENTRY(multicast);
586NETSTAT_ENTRY(collisions);
587NETSTAT_ENTRY(rx_length_errors);
588NETSTAT_ENTRY(rx_over_errors);
589NETSTAT_ENTRY(rx_crc_errors);
590NETSTAT_ENTRY(rx_frame_errors);
591NETSTAT_ENTRY(rx_fifo_errors);
592NETSTAT_ENTRY(rx_missed_errors);
593NETSTAT_ENTRY(tx_aborted_errors);
594NETSTAT_ENTRY(tx_carrier_errors);
595NETSTAT_ENTRY(tx_fifo_errors);
596NETSTAT_ENTRY(tx_heartbeat_errors);
597NETSTAT_ENTRY(tx_window_errors);
598NETSTAT_ENTRY(rx_compressed);
599NETSTAT_ENTRY(tx_compressed);
600NETSTAT_ENTRY(rx_nohandler);
601
602static struct attribute *netstat_attrs[] __ro_after_init = {
603 &dev_attr_rx_packets.attr,
604 &dev_attr_tx_packets.attr,
605 &dev_attr_rx_bytes.attr,
606 &dev_attr_tx_bytes.attr,
607 &dev_attr_rx_errors.attr,
608 &dev_attr_tx_errors.attr,
609 &dev_attr_rx_dropped.attr,
610 &dev_attr_tx_dropped.attr,
611 &dev_attr_multicast.attr,
612 &dev_attr_collisions.attr,
613 &dev_attr_rx_length_errors.attr,
614 &dev_attr_rx_over_errors.attr,
615 &dev_attr_rx_crc_errors.attr,
616 &dev_attr_rx_frame_errors.attr,
617 &dev_attr_rx_fifo_errors.attr,
618 &dev_attr_rx_missed_errors.attr,
619 &dev_attr_tx_aborted_errors.attr,
620 &dev_attr_tx_carrier_errors.attr,
621 &dev_attr_tx_fifo_errors.attr,
622 &dev_attr_tx_heartbeat_errors.attr,
623 &dev_attr_tx_window_errors.attr,
624 &dev_attr_rx_compressed.attr,
625 &dev_attr_tx_compressed.attr,
626 &dev_attr_rx_nohandler.attr,
627 NULL
628};
629
630static const struct attribute_group netstat_group = {
631 .name = "statistics",
632 .attrs = netstat_attrs,
633};
634
635#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
636static struct attribute *wireless_attrs[] = {
637 NULL
638};
639
640static const struct attribute_group wireless_group = {
641 .name = "wireless",
642 .attrs = wireless_attrs,
643};
644#endif
645
646#else /* CONFIG_SYSFS */
647#define net_class_groups NULL
648#endif /* CONFIG_SYSFS */
649
650#ifdef CONFIG_SYSFS
651#define to_rx_queue_attr(_attr) \
652 container_of(_attr, struct rx_queue_attribute, attr)
653
654#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
655
656static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
657 char *buf)
658{
659 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
660 struct netdev_rx_queue *queue = to_rx_queue(kobj);
661
662 if (!attribute->show)
663 return -EIO;
664
665 return attribute->show(queue, buf);
666}
667
668static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
669 const char *buf, size_t count)
670{
671 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
672 struct netdev_rx_queue *queue = to_rx_queue(kobj);
673
674 if (!attribute->store)
675 return -EIO;
676
677 return attribute->store(queue, buf, count);
678}
679
680static const struct sysfs_ops rx_queue_sysfs_ops = {
681 .show = rx_queue_attr_show,
682 .store = rx_queue_attr_store,
683};
684
685#ifdef CONFIG_RPS
686static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
687{
688 struct rps_map *map;
689 cpumask_var_t mask;
690 int i, len;
691
692 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
693 return -ENOMEM;
694
695 rcu_read_lock();
696 map = rcu_dereference(queue->rps_map);
697 if (map)
698 for (i = 0; i < map->len; i++)
699 cpumask_set_cpu(map->cpus[i], mask);
700
701 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
702 rcu_read_unlock();
703 free_cpumask_var(mask);
704
705 return len < PAGE_SIZE ? len : -EINVAL;
706}
707
708static ssize_t store_rps_map(struct netdev_rx_queue *queue,
709 const char *buf, size_t len)
710{
711 struct rps_map *old_map, *map;
712 cpumask_var_t mask;
713 int err, cpu, i;
714 static DEFINE_MUTEX(rps_map_mutex);
715
716 if (!capable(CAP_NET_ADMIN))
717 return -EPERM;
718
719 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
720 return -ENOMEM;
721
722 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
723 if (err) {
724 free_cpumask_var(mask);
725 return err;
726 }
727
728 map = kzalloc(max_t(unsigned int,
729 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
730 GFP_KERNEL);
731 if (!map) {
732 free_cpumask_var(mask);
733 return -ENOMEM;
734 }
735
736 i = 0;
737 for_each_cpu_and(cpu, mask, cpu_online_mask)
738 map->cpus[i++] = cpu;
739
740 if (i) {
741 map->len = i;
742 } else {
743 kfree(map);
744 map = NULL;
745 }
746
747 mutex_lock(&rps_map_mutex);
748 old_map = rcu_dereference_protected(queue->rps_map,
749 mutex_is_locked(&rps_map_mutex));
750 rcu_assign_pointer(queue->rps_map, map);
751
752 if (map)
753 static_branch_inc(&rps_needed);
754 if (old_map)
755 static_branch_dec(&rps_needed);
756
757 mutex_unlock(&rps_map_mutex);
758
759 if (old_map)
760 kfree_rcu(old_map, rcu);
761
762 free_cpumask_var(mask);
763 return len;
764}
765
766static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
767 char *buf)
768{
769 struct rps_dev_flow_table *flow_table;
770 unsigned long val = 0;
771
772 rcu_read_lock();
773 flow_table = rcu_dereference(queue->rps_flow_table);
774 if (flow_table)
775 val = (unsigned long)flow_table->mask + 1;
776 rcu_read_unlock();
777
778 return sprintf(buf, "%lu\n", val);
779}
780
781static void rps_dev_flow_table_release(struct rcu_head *rcu)
782{
783 struct rps_dev_flow_table *table = container_of(rcu,
784 struct rps_dev_flow_table, rcu);
785 vfree(table);
786}
787
788static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
789 const char *buf, size_t len)
790{
791 unsigned long mask, count;
792 struct rps_dev_flow_table *table, *old_table;
793 static DEFINE_SPINLOCK(rps_dev_flow_lock);
794 int rc;
795
796 if (!capable(CAP_NET_ADMIN))
797 return -EPERM;
798
799 rc = kstrtoul(buf, 0, &count);
800 if (rc < 0)
801 return rc;
802
803 if (count) {
804 mask = count - 1;
805 /* mask = roundup_pow_of_two(count) - 1;
806 * without overflows...
807 */
808 while ((mask | (mask >> 1)) != mask)
809 mask |= (mask >> 1);
810 /* On 64 bit arches, must check mask fits in table->mask (u32),
811 * and on 32bit arches, must check
812 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
813 */
814#if BITS_PER_LONG > 32
815 if (mask > (unsigned long)(u32)mask)
816 return -EINVAL;
817#else
818 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
819 / sizeof(struct rps_dev_flow)) {
820 /* Enforce a limit to prevent overflow */
821 return -EINVAL;
822 }
823#endif
824 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
825 if (!table)
826 return -ENOMEM;
827
828 table->mask = mask;
829 for (count = 0; count <= mask; count++)
830 table->flows[count].cpu = RPS_NO_CPU;
831 } else {
832 table = NULL;
833 }
834
835 spin_lock(&rps_dev_flow_lock);
836 old_table = rcu_dereference_protected(queue->rps_flow_table,
837 lockdep_is_held(&rps_dev_flow_lock));
838 rcu_assign_pointer(queue->rps_flow_table, table);
839 spin_unlock(&rps_dev_flow_lock);
840
841 if (old_table)
842 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
843
844 return len;
845}
846
847static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
848 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
849
850static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
851 = __ATTR(rps_flow_cnt, 0644,
852 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
853#endif /* CONFIG_RPS */
854
855static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
856#ifdef CONFIG_RPS
857 &rps_cpus_attribute.attr,
858 &rps_dev_flow_table_cnt_attribute.attr,
859#endif
860 NULL
861};
862ATTRIBUTE_GROUPS(rx_queue_default);
863
864static void rx_queue_release(struct kobject *kobj)
865{
866 struct netdev_rx_queue *queue = to_rx_queue(kobj);
867#ifdef CONFIG_RPS
868 struct rps_map *map;
869 struct rps_dev_flow_table *flow_table;
870
871 map = rcu_dereference_protected(queue->rps_map, 1);
872 if (map) {
873 RCU_INIT_POINTER(queue->rps_map, NULL);
874 kfree_rcu(map, rcu);
875 }
876
877 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
878 if (flow_table) {
879 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
880 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
881 }
882#endif
883
884 memset(kobj, 0, sizeof(*kobj));
885 dev_put(queue->dev);
886}
887
888static const void *rx_queue_namespace(struct kobject *kobj)
889{
890 struct netdev_rx_queue *queue = to_rx_queue(kobj);
891 struct device *dev = &queue->dev->dev;
892 const void *ns = NULL;
893
894 if (dev->class && dev->class->ns_type)
895 ns = dev->class->namespace(dev);
896
897 return ns;
898}
899
900static void rx_queue_get_ownership(struct kobject *kobj,
901 kuid_t *uid, kgid_t *gid)
902{
903 const struct net *net = rx_queue_namespace(kobj);
904
905 net_ns_get_ownership(net, uid, gid);
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_groups = rx_queue_default_groups,
912 .namespace = rx_queue_namespace,
913 .get_ownership = rx_queue_get_ownership,
914};
915
916static int rx_queue_add_kobject(struct net_device *dev, int index)
917{
918 struct netdev_rx_queue *queue = dev->_rx + index;
919 struct kobject *kobj = &queue->kobj;
920 int error = 0;
921
922 kobj->kset = dev->queues_kset;
923 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
924 "rx-%u", index);
925 if (error)
926 goto err;
927
928 dev_hold(queue->dev);
929
930 if (dev->sysfs_rx_queue_group) {
931 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
932 if (error)
933 goto err;
934 }
935
936 kobject_uevent(kobj, KOBJ_ADD);
937
938 return error;
939
940err:
941 kobject_put(kobj);
942 return error;
943}
944#endif /* CONFIG_SYSFS */
945
946int
947net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
948{
949#ifdef CONFIG_SYSFS
950 int i;
951 int error = 0;
952
953#ifndef CONFIG_RPS
954 if (!dev->sysfs_rx_queue_group)
955 return 0;
956#endif
957 for (i = old_num; i < new_num; i++) {
958 error = rx_queue_add_kobject(dev, i);
959 if (error) {
960 new_num = old_num;
961 break;
962 }
963 }
964
965 while (--i >= new_num) {
966 struct kobject *kobj = &dev->_rx[i].kobj;
967
968 if (!refcount_read(&dev_net(dev)->count))
969 kobj->uevent_suppress = 1;
970 if (dev->sysfs_rx_queue_group)
971 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
972 kobject_put(kobj);
973 }
974
975 return error;
976#else
977 return 0;
978#endif
979}
980
981#ifdef CONFIG_SYSFS
982/*
983 * netdev_queue sysfs structures and functions.
984 */
985struct netdev_queue_attribute {
986 struct attribute attr;
987 ssize_t (*show)(struct netdev_queue *queue, char *buf);
988 ssize_t (*store)(struct netdev_queue *queue,
989 const char *buf, size_t len);
990};
991#define to_netdev_queue_attr(_attr) \
992 container_of(_attr, struct netdev_queue_attribute, attr)
993
994#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
995
996static ssize_t netdev_queue_attr_show(struct kobject *kobj,
997 struct attribute *attr, char *buf)
998{
999 const struct netdev_queue_attribute *attribute
1000 = to_netdev_queue_attr(attr);
1001 struct netdev_queue *queue = to_netdev_queue(kobj);
1002
1003 if (!attribute->show)
1004 return -EIO;
1005
1006 return attribute->show(queue, buf);
1007}
1008
1009static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1010 struct attribute *attr,
1011 const char *buf, size_t count)
1012{
1013 const struct netdev_queue_attribute *attribute
1014 = to_netdev_queue_attr(attr);
1015 struct netdev_queue *queue = to_netdev_queue(kobj);
1016
1017 if (!attribute->store)
1018 return -EIO;
1019
1020 return attribute->store(queue, buf, count);
1021}
1022
1023static const struct sysfs_ops netdev_queue_sysfs_ops = {
1024 .show = netdev_queue_attr_show,
1025 .store = netdev_queue_attr_store,
1026};
1027
1028static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1029{
1030 unsigned long trans_timeout;
1031
1032 spin_lock_irq(&queue->_xmit_lock);
1033 trans_timeout = queue->trans_timeout;
1034 spin_unlock_irq(&queue->_xmit_lock);
1035
1036 return sprintf(buf, "%lu", trans_timeout);
1037}
1038
1039static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1040{
1041 struct net_device *dev = queue->dev;
1042 unsigned int i;
1043
1044 i = queue - dev->_tx;
1045 BUG_ON(i >= dev->num_tx_queues);
1046
1047 return i;
1048}
1049
1050static ssize_t traffic_class_show(struct netdev_queue *queue,
1051 char *buf)
1052{
1053 struct net_device *dev = queue->dev;
1054 int index;
1055 int tc;
1056
1057 if (!netif_is_multiqueue(dev))
1058 return -ENOENT;
1059
1060 index = get_netdev_queue_index(queue);
1061
1062 /* If queue belongs to subordinate dev use its TC mapping */
1063 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1064
1065 tc = netdev_txq_to_tc(dev, index);
1066 if (tc < 0)
1067 return -EINVAL;
1068
1069 /* We can report the traffic class one of two ways:
1070 * Subordinate device traffic classes are reported with the traffic
1071 * class first, and then the subordinate class so for example TC0 on
1072 * subordinate device 2 will be reported as "0-2". If the queue
1073 * belongs to the root device it will be reported with just the
1074 * traffic class, so just "0" for TC 0 for example.
1075 */
1076 return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1077 sprintf(buf, "%u\n", tc);
1078}
1079
1080#ifdef CONFIG_XPS
1081static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1082 char *buf)
1083{
1084 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1085}
1086
1087static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1088 const char *buf, size_t len)
1089{
1090 struct net_device *dev = queue->dev;
1091 int err, index = get_netdev_queue_index(queue);
1092 u32 rate = 0;
1093
1094 if (!capable(CAP_NET_ADMIN))
1095 return -EPERM;
1096
1097 err = kstrtou32(buf, 10, &rate);
1098 if (err < 0)
1099 return err;
1100
1101 if (!rtnl_trylock())
1102 return restart_syscall();
1103
1104 err = -EOPNOTSUPP;
1105 if (dev->netdev_ops->ndo_set_tx_maxrate)
1106 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1107
1108 rtnl_unlock();
1109 if (!err) {
1110 queue->tx_maxrate = rate;
1111 return len;
1112 }
1113 return err;
1114}
1115
1116static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1117 = __ATTR_RW(tx_maxrate);
1118#endif
1119
1120static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1121 = __ATTR_RO(tx_timeout);
1122
1123static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1124 = __ATTR_RO(traffic_class);
1125
1126#ifdef CONFIG_BQL
1127/*
1128 * Byte queue limits sysfs structures and functions.
1129 */
1130static ssize_t bql_show(char *buf, unsigned int value)
1131{
1132 return sprintf(buf, "%u\n", value);
1133}
1134
1135static ssize_t bql_set(const char *buf, const size_t count,
1136 unsigned int *pvalue)
1137{
1138 unsigned int value;
1139 int err;
1140
1141 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1142 value = DQL_MAX_LIMIT;
1143 } else {
1144 err = kstrtouint(buf, 10, &value);
1145 if (err < 0)
1146 return err;
1147 if (value > DQL_MAX_LIMIT)
1148 return -EINVAL;
1149 }
1150
1151 *pvalue = value;
1152
1153 return count;
1154}
1155
1156static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1157 char *buf)
1158{
1159 struct dql *dql = &queue->dql;
1160
1161 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1162}
1163
1164static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1165 const char *buf, size_t len)
1166{
1167 struct dql *dql = &queue->dql;
1168 unsigned int value;
1169 int err;
1170
1171 err = kstrtouint(buf, 10, &value);
1172 if (err < 0)
1173 return err;
1174
1175 dql->slack_hold_time = msecs_to_jiffies(value);
1176
1177 return len;
1178}
1179
1180static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1181 = __ATTR(hold_time, 0644,
1182 bql_show_hold_time, bql_set_hold_time);
1183
1184static ssize_t bql_show_inflight(struct netdev_queue *queue,
1185 char *buf)
1186{
1187 struct dql *dql = &queue->dql;
1188
1189 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1190}
1191
1192static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1193 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1194
1195#define BQL_ATTR(NAME, FIELD) \
1196static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1197 char *buf) \
1198{ \
1199 return bql_show(buf, queue->dql.FIELD); \
1200} \
1201 \
1202static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1203 const char *buf, size_t len) \
1204{ \
1205 return bql_set(buf, len, &queue->dql.FIELD); \
1206} \
1207 \
1208static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1209 = __ATTR(NAME, 0644, \
1210 bql_show_ ## NAME, bql_set_ ## NAME)
1211
1212BQL_ATTR(limit, limit);
1213BQL_ATTR(limit_max, max_limit);
1214BQL_ATTR(limit_min, min_limit);
1215
1216static struct attribute *dql_attrs[] __ro_after_init = {
1217 &bql_limit_attribute.attr,
1218 &bql_limit_max_attribute.attr,
1219 &bql_limit_min_attribute.attr,
1220 &bql_hold_time_attribute.attr,
1221 &bql_inflight_attribute.attr,
1222 NULL
1223};
1224
1225static const struct attribute_group dql_group = {
1226 .name = "byte_queue_limits",
1227 .attrs = dql_attrs,
1228};
1229#endif /* CONFIG_BQL */
1230
1231#ifdef CONFIG_XPS
1232static ssize_t xps_cpus_show(struct netdev_queue *queue,
1233 char *buf)
1234{
1235 struct net_device *dev = queue->dev;
1236 int cpu, len, num_tc = 1, tc = 0;
1237 struct xps_dev_maps *dev_maps;
1238 cpumask_var_t mask;
1239 unsigned long index;
1240
1241 if (!netif_is_multiqueue(dev))
1242 return -ENOENT;
1243
1244 index = get_netdev_queue_index(queue);
1245
1246 if (dev->num_tc) {
1247 /* Do not allow XPS on subordinate device directly */
1248 num_tc = dev->num_tc;
1249 if (num_tc < 0)
1250 return -EINVAL;
1251
1252 /* If queue belongs to subordinate dev use its map */
1253 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1254
1255 tc = netdev_txq_to_tc(dev, index);
1256 if (tc < 0)
1257 return -EINVAL;
1258 }
1259
1260 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1261 return -ENOMEM;
1262
1263 rcu_read_lock();
1264 dev_maps = rcu_dereference(dev->xps_cpus_map);
1265 if (dev_maps) {
1266 for_each_possible_cpu(cpu) {
1267 int i, tci = cpu * num_tc + tc;
1268 struct xps_map *map;
1269
1270 map = rcu_dereference(dev_maps->attr_map[tci]);
1271 if (!map)
1272 continue;
1273
1274 for (i = map->len; i--;) {
1275 if (map->queues[i] == index) {
1276 cpumask_set_cpu(cpu, mask);
1277 break;
1278 }
1279 }
1280 }
1281 }
1282 rcu_read_unlock();
1283
1284 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1285 free_cpumask_var(mask);
1286 return len < PAGE_SIZE ? len : -EINVAL;
1287}
1288
1289static ssize_t xps_cpus_store(struct netdev_queue *queue,
1290 const char *buf, size_t len)
1291{
1292 struct net_device *dev = queue->dev;
1293 unsigned long index;
1294 cpumask_var_t mask;
1295 int err;
1296
1297 if (!netif_is_multiqueue(dev))
1298 return -ENOENT;
1299
1300 if (!capable(CAP_NET_ADMIN))
1301 return -EPERM;
1302
1303 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1304 return -ENOMEM;
1305
1306 index = get_netdev_queue_index(queue);
1307
1308 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1309 if (err) {
1310 free_cpumask_var(mask);
1311 return err;
1312 }
1313
1314 err = netif_set_xps_queue(dev, mask, index);
1315
1316 free_cpumask_var(mask);
1317
1318 return err ? : len;
1319}
1320
1321static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1322 = __ATTR_RW(xps_cpus);
1323
1324static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1325{
1326 struct net_device *dev = queue->dev;
1327 struct xps_dev_maps *dev_maps;
1328 unsigned long *mask, index;
1329 int j, len, num_tc = 1, tc = 0;
1330
1331 index = get_netdev_queue_index(queue);
1332
1333 if (dev->num_tc) {
1334 num_tc = dev->num_tc;
1335 tc = netdev_txq_to_tc(dev, index);
1336 if (tc < 0)
1337 return -EINVAL;
1338 }
1339 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1340 if (!mask)
1341 return -ENOMEM;
1342
1343 rcu_read_lock();
1344 dev_maps = rcu_dereference(dev->xps_rxqs_map);
1345 if (!dev_maps)
1346 goto out_no_maps;
1347
1348 for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1349 j < dev->num_rx_queues;) {
1350 int i, tci = j * num_tc + tc;
1351 struct xps_map *map;
1352
1353 map = rcu_dereference(dev_maps->attr_map[tci]);
1354 if (!map)
1355 continue;
1356
1357 for (i = map->len; i--;) {
1358 if (map->queues[i] == index) {
1359 set_bit(j, mask);
1360 break;
1361 }
1362 }
1363 }
1364out_no_maps:
1365 rcu_read_unlock();
1366
1367 len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1368 bitmap_free(mask);
1369
1370 return len < PAGE_SIZE ? len : -EINVAL;
1371}
1372
1373static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1374 size_t len)
1375{
1376 struct net_device *dev = queue->dev;
1377 struct net *net = dev_net(dev);
1378 unsigned long *mask, index;
1379 int err;
1380
1381 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1382 return -EPERM;
1383
1384 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1385 if (!mask)
1386 return -ENOMEM;
1387
1388 index = get_netdev_queue_index(queue);
1389
1390 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1391 if (err) {
1392 bitmap_free(mask);
1393 return err;
1394 }
1395
1396 cpus_read_lock();
1397 err = __netif_set_xps_queue(dev, mask, index, true);
1398 cpus_read_unlock();
1399
1400 bitmap_free(mask);
1401 return err ? : len;
1402}
1403
1404static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1405 = __ATTR_RW(xps_rxqs);
1406#endif /* CONFIG_XPS */
1407
1408static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1409 &queue_trans_timeout.attr,
1410 &queue_traffic_class.attr,
1411#ifdef CONFIG_XPS
1412 &xps_cpus_attribute.attr,
1413 &xps_rxqs_attribute.attr,
1414 &queue_tx_maxrate.attr,
1415#endif
1416 NULL
1417};
1418ATTRIBUTE_GROUPS(netdev_queue_default);
1419
1420static void netdev_queue_release(struct kobject *kobj)
1421{
1422 struct netdev_queue *queue = to_netdev_queue(kobj);
1423
1424 memset(kobj, 0, sizeof(*kobj));
1425 dev_put(queue->dev);
1426}
1427
1428static const void *netdev_queue_namespace(struct kobject *kobj)
1429{
1430 struct netdev_queue *queue = to_netdev_queue(kobj);
1431 struct device *dev = &queue->dev->dev;
1432 const void *ns = NULL;
1433
1434 if (dev->class && dev->class->ns_type)
1435 ns = dev->class->namespace(dev);
1436
1437 return ns;
1438}
1439
1440static void netdev_queue_get_ownership(struct kobject *kobj,
1441 kuid_t *uid, kgid_t *gid)
1442{
1443 const struct net *net = netdev_queue_namespace(kobj);
1444
1445 net_ns_get_ownership(net, uid, gid);
1446}
1447
1448static struct kobj_type netdev_queue_ktype __ro_after_init = {
1449 .sysfs_ops = &netdev_queue_sysfs_ops,
1450 .release = netdev_queue_release,
1451 .default_groups = netdev_queue_default_groups,
1452 .namespace = netdev_queue_namespace,
1453 .get_ownership = netdev_queue_get_ownership,
1454};
1455
1456static int netdev_queue_add_kobject(struct net_device *dev, int index)
1457{
1458 struct netdev_queue *queue = dev->_tx + index;
1459 struct kobject *kobj = &queue->kobj;
1460 int error = 0;
1461
1462 kobj->kset = dev->queues_kset;
1463 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1464 "tx-%u", index);
1465 if (error)
1466 goto err;
1467
1468 dev_hold(queue->dev);
1469
1470#ifdef CONFIG_BQL
1471 error = sysfs_create_group(kobj, &dql_group);
1472 if (error)
1473 goto err;
1474#endif
1475
1476 kobject_uevent(kobj, KOBJ_ADD);
1477 return 0;
1478
1479err:
1480 kobject_put(kobj);
1481 return error;
1482}
1483#endif /* CONFIG_SYSFS */
1484
1485int
1486netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1487{
1488#ifdef CONFIG_SYSFS
1489 int i;
1490 int error = 0;
1491
1492 for (i = old_num; i < new_num; i++) {
1493 error = netdev_queue_add_kobject(dev, i);
1494 if (error) {
1495 new_num = old_num;
1496 break;
1497 }
1498 }
1499
1500 while (--i >= new_num) {
1501 struct netdev_queue *queue = dev->_tx + i;
1502
1503 if (!refcount_read(&dev_net(dev)->count))
1504 queue->kobj.uevent_suppress = 1;
1505#ifdef CONFIG_BQL
1506 sysfs_remove_group(&queue->kobj, &dql_group);
1507#endif
1508 kobject_put(&queue->kobj);
1509 }
1510
1511 return error;
1512#else
1513 return 0;
1514#endif /* CONFIG_SYSFS */
1515}
1516
1517static int register_queue_kobjects(struct net_device *dev)
1518{
1519 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1520
1521#ifdef CONFIG_SYSFS
1522 dev->queues_kset = kset_create_and_add("queues",
1523 NULL, &dev->dev.kobj);
1524 if (!dev->queues_kset)
1525 return -ENOMEM;
1526 real_rx = dev->real_num_rx_queues;
1527#endif
1528 real_tx = dev->real_num_tx_queues;
1529
1530 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1531 if (error)
1532 goto error;
1533 rxq = real_rx;
1534
1535 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1536 if (error)
1537 goto error;
1538 txq = real_tx;
1539
1540 return 0;
1541
1542error:
1543 netdev_queue_update_kobjects(dev, txq, 0);
1544 net_rx_queue_update_kobjects(dev, rxq, 0);
1545#ifdef CONFIG_SYSFS
1546 kset_unregister(dev->queues_kset);
1547#endif
1548 return error;
1549}
1550
1551static void remove_queue_kobjects(struct net_device *dev)
1552{
1553 int real_rx = 0, real_tx = 0;
1554
1555#ifdef CONFIG_SYSFS
1556 real_rx = dev->real_num_rx_queues;
1557#endif
1558 real_tx = dev->real_num_tx_queues;
1559
1560 net_rx_queue_update_kobjects(dev, real_rx, 0);
1561 netdev_queue_update_kobjects(dev, real_tx, 0);
1562#ifdef CONFIG_SYSFS
1563 kset_unregister(dev->queues_kset);
1564#endif
1565}
1566
1567static bool net_current_may_mount(void)
1568{
1569 struct net *net = current->nsproxy->net_ns;
1570
1571 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1572}
1573
1574static void *net_grab_current_ns(void)
1575{
1576 struct net *ns = current->nsproxy->net_ns;
1577#ifdef CONFIG_NET_NS
1578 if (ns)
1579 refcount_inc(&ns->passive);
1580#endif
1581 return ns;
1582}
1583
1584static const void *net_initial_ns(void)
1585{
1586 return &init_net;
1587}
1588
1589static const void *net_netlink_ns(struct sock *sk)
1590{
1591 return sock_net(sk);
1592}
1593
1594const struct kobj_ns_type_operations net_ns_type_operations = {
1595 .type = KOBJ_NS_TYPE_NET,
1596 .current_may_mount = net_current_may_mount,
1597 .grab_current_ns = net_grab_current_ns,
1598 .netlink_ns = net_netlink_ns,
1599 .initial_ns = net_initial_ns,
1600 .drop_ns = net_drop_ns,
1601};
1602EXPORT_SYMBOL_GPL(net_ns_type_operations);
1603
1604static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1605{
1606 struct net_device *dev = to_net_dev(d);
1607 int retval;
1608
1609 /* pass interface to uevent. */
1610 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1611 if (retval)
1612 goto exit;
1613
1614 /* pass ifindex to uevent.
1615 * ifindex is useful as it won't change (interface name may change)
1616 * and is what RtNetlink uses natively.
1617 */
1618 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1619
1620exit:
1621 return retval;
1622}
1623
1624/*
1625 * netdev_release -- destroy and free a dead device.
1626 * Called when last reference to device kobject is gone.
1627 */
1628static void netdev_release(struct device *d)
1629{
1630 struct net_device *dev = to_net_dev(d);
1631
1632 BUG_ON(dev->reg_state != NETREG_RELEASED);
1633
1634 /* no need to wait for rcu grace period:
1635 * device is dead and about to be freed.
1636 */
1637 kfree(rcu_access_pointer(dev->ifalias));
1638 netdev_freemem(dev);
1639}
1640
1641static const void *net_namespace(struct device *d)
1642{
1643 struct net_device *dev = to_net_dev(d);
1644
1645 return dev_net(dev);
1646}
1647
1648static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1649{
1650 struct net_device *dev = to_net_dev(d);
1651 const struct net *net = dev_net(dev);
1652
1653 net_ns_get_ownership(net, uid, gid);
1654}
1655
1656static struct class net_class __ro_after_init = {
1657 .name = "net",
1658 .dev_release = netdev_release,
1659 .dev_groups = net_class_groups,
1660 .dev_uevent = netdev_uevent,
1661 .ns_type = &net_ns_type_operations,
1662 .namespace = net_namespace,
1663 .get_ownership = net_get_ownership,
1664};
1665
1666#ifdef CONFIG_OF_NET
1667static int of_dev_node_match(struct device *dev, const void *data)
1668{
1669 int ret = 0;
1670
1671 if (dev->parent)
1672 ret = dev->parent->of_node == data;
1673
1674 return ret == 0 ? dev->of_node == data : ret;
1675}
1676
1677/*
1678 * of_find_net_device_by_node - lookup the net device for the device node
1679 * @np: OF device node
1680 *
1681 * Looks up the net_device structure corresponding with the device node.
1682 * If successful, returns a pointer to the net_device with the embedded
1683 * struct device refcount incremented by one, or NULL on failure. The
1684 * refcount must be dropped when done with the net_device.
1685 */
1686struct net_device *of_find_net_device_by_node(struct device_node *np)
1687{
1688 struct device *dev;
1689
1690 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1691 if (!dev)
1692 return NULL;
1693
1694 return to_net_dev(dev);
1695}
1696EXPORT_SYMBOL(of_find_net_device_by_node);
1697#endif
1698
1699/* Delete sysfs entries but hold kobject reference until after all
1700 * netdev references are gone.
1701 */
1702void netdev_unregister_kobject(struct net_device *ndev)
1703{
1704 struct device *dev = &ndev->dev;
1705
1706 if (!refcount_read(&dev_net(ndev)->count))
1707 dev_set_uevent_suppress(dev, 1);
1708
1709 kobject_get(&dev->kobj);
1710
1711 remove_queue_kobjects(ndev);
1712
1713 pm_runtime_set_memalloc_noio(dev, false);
1714
1715 device_del(dev);
1716}
1717
1718/* Create sysfs entries for network device. */
1719int netdev_register_kobject(struct net_device *ndev)
1720{
1721 struct device *dev = &ndev->dev;
1722 const struct attribute_group **groups = ndev->sysfs_groups;
1723 int error = 0;
1724
1725 device_initialize(dev);
1726 dev->class = &net_class;
1727 dev->platform_data = ndev;
1728 dev->groups = groups;
1729
1730 dev_set_name(dev, "%s", ndev->name);
1731
1732#ifdef CONFIG_SYSFS
1733 /* Allow for a device specific group */
1734 if (*groups)
1735 groups++;
1736
1737 *groups++ = &netstat_group;
1738
1739#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1740 if (ndev->ieee80211_ptr)
1741 *groups++ = &wireless_group;
1742#if IS_ENABLED(CONFIG_WIRELESS_EXT)
1743 else if (ndev->wireless_handlers)
1744 *groups++ = &wireless_group;
1745#endif
1746#endif
1747#endif /* CONFIG_SYSFS */
1748
1749 error = device_add(dev);
1750 if (error)
1751 return error;
1752
1753 error = register_queue_kobjects(ndev);
1754 if (error) {
1755 device_del(dev);
1756 return error;
1757 }
1758
1759 pm_runtime_set_memalloc_noio(dev, true);
1760
1761 return error;
1762}
1763
1764int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1765 const void *ns)
1766{
1767 return class_create_file_ns(&net_class, class_attr, ns);
1768}
1769EXPORT_SYMBOL(netdev_class_create_file_ns);
1770
1771void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1772 const void *ns)
1773{
1774 class_remove_file_ns(&net_class, class_attr, ns);
1775}
1776EXPORT_SYMBOL(netdev_class_remove_file_ns);
1777
1778int __init netdev_kobject_init(void)
1779{
1780 kobj_ns_type_register(&net_ns_type_operations);
1781 return class_register(&net_class);
1782}
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}