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12#include <linux/capability.h>
13#include <linux/kernel.h>
14#include <linux/netdevice.h>
15#include <linux/if_arp.h>
16#include <linux/slab.h>
17#include <linux/sched/signal.h>
18#include <linux/nsproxy.h>
19#include <net/sock.h>
20#include <net/net_namespace.h>
21#include <linux/rtnetlink.h>
22#include <linux/vmalloc.h>
23#include <linux/export.h>
24#include <linux/jiffies.h>
25#include <linux/pm_runtime.h>
26#include <linux/of.h>
27#include <linux/of_net.h>
28#include <linux/cpu.h>
29
30#include "net-sysfs.h"
31
32#ifdef CONFIG_SYSFS
33static const char fmt_hex[] = "%#x\n";
34static const char fmt_dec[] = "%d\n";
35static const char fmt_ulong[] = "%lu\n";
36static const char fmt_u64[] = "%llu\n";
37
38static inline int dev_isalive(const struct net_device *dev)
39{
40 return dev->reg_state <= NETREG_REGISTERED;
41}
42
43
44static ssize_t netdev_show(const struct device *dev,
45 struct device_attribute *attr, char *buf,
46 ssize_t (*format)(const struct net_device *, char *))
47{
48 struct net_device *ndev = to_net_dev(dev);
49 ssize_t ret = -EINVAL;
50
51 read_lock(&dev_base_lock);
52 if (dev_isalive(ndev))
53 ret = (*format)(ndev, buf);
54 read_unlock(&dev_base_lock);
55
56 return ret;
57}
58
59
60#define NETDEVICE_SHOW(field, format_string) \
61static ssize_t format_##field(const struct net_device *dev, char *buf) \
62{ \
63 return sprintf(buf, format_string, dev->field); \
64} \
65static ssize_t field##_show(struct device *dev, \
66 struct device_attribute *attr, char *buf) \
67{ \
68 return netdev_show(dev, attr, buf, format_##field); \
69} \
70
71#define NETDEVICE_SHOW_RO(field, format_string) \
72NETDEVICE_SHOW(field, format_string); \
73static DEVICE_ATTR_RO(field)
74
75#define NETDEVICE_SHOW_RW(field, format_string) \
76NETDEVICE_SHOW(field, format_string); \
77static DEVICE_ATTR_RW(field)
78
79
80static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
81 const char *buf, size_t len,
82 int (*set)(struct net_device *, unsigned long))
83{
84 struct net_device *netdev = to_net_dev(dev);
85 struct net *net = dev_net(netdev);
86 unsigned long new;
87 int ret = -EINVAL;
88
89 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
90 return -EPERM;
91
92 ret = kstrtoul(buf, 0, &new);
93 if (ret)
94 goto err;
95
96 if (!rtnl_trylock())
97 return restart_syscall();
98
99 if (dev_isalive(netdev)) {
100 ret = (*set)(netdev, new);
101 if (ret == 0)
102 ret = len;
103 }
104 rtnl_unlock();
105 err:
106 return ret;
107}
108
109NETDEVICE_SHOW_RO(dev_id, fmt_hex);
110NETDEVICE_SHOW_RO(dev_port, fmt_dec);
111NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
112NETDEVICE_SHOW_RO(addr_len, fmt_dec);
113NETDEVICE_SHOW_RO(ifindex, fmt_dec);
114NETDEVICE_SHOW_RO(type, fmt_dec);
115NETDEVICE_SHOW_RO(link_mode, fmt_dec);
116
117static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
118 char *buf)
119{
120 struct net_device *ndev = to_net_dev(dev);
121
122 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
123}
124static DEVICE_ATTR_RO(iflink);
125
126static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
127{
128 return sprintf(buf, fmt_dec, dev->name_assign_type);
129}
130
131static ssize_t name_assign_type_show(struct device *dev,
132 struct device_attribute *attr,
133 char *buf)
134{
135 struct net_device *ndev = to_net_dev(dev);
136 ssize_t ret = -EINVAL;
137
138 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
139 ret = netdev_show(dev, attr, buf, format_name_assign_type);
140
141 return ret;
142}
143static DEVICE_ATTR_RO(name_assign_type);
144
145
146static ssize_t address_show(struct device *dev, struct device_attribute *attr,
147 char *buf)
148{
149 struct net_device *ndev = to_net_dev(dev);
150 ssize_t ret = -EINVAL;
151
152 read_lock(&dev_base_lock);
153 if (dev_isalive(ndev))
154 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
155 read_unlock(&dev_base_lock);
156 return ret;
157}
158static DEVICE_ATTR_RO(address);
159
160static ssize_t broadcast_show(struct device *dev,
161 struct device_attribute *attr, char *buf)
162{
163 struct net_device *ndev = to_net_dev(dev);
164
165 if (dev_isalive(ndev))
166 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
167 return -EINVAL;
168}
169static DEVICE_ATTR_RO(broadcast);
170
171static int change_carrier(struct net_device *dev, unsigned long new_carrier)
172{
173 if (!netif_running(dev))
174 return -EINVAL;
175 return dev_change_carrier(dev, (bool)new_carrier);
176}
177
178static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
179 const char *buf, size_t len)
180{
181 return netdev_store(dev, attr, buf, len, change_carrier);
182}
183
184static ssize_t carrier_show(struct device *dev,
185 struct device_attribute *attr, char *buf)
186{
187 struct net_device *netdev = to_net_dev(dev);
188
189 if (netif_running(netdev))
190 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
191
192 return -EINVAL;
193}
194static DEVICE_ATTR_RW(carrier);
195
196static ssize_t speed_show(struct device *dev,
197 struct device_attribute *attr, char *buf)
198{
199 struct net_device *netdev = to_net_dev(dev);
200 int ret = -EINVAL;
201
202 if (!rtnl_trylock())
203 return restart_syscall();
204
205 if (netif_running(netdev)) {
206 struct ethtool_link_ksettings cmd;
207
208 if (!__ethtool_get_link_ksettings(netdev, &cmd))
209 ret = sprintf(buf, fmt_dec, cmd.base.speed);
210 }
211 rtnl_unlock();
212 return ret;
213}
214static DEVICE_ATTR_RO(speed);
215
216static ssize_t duplex_show(struct device *dev,
217 struct device_attribute *attr, char *buf)
218{
219 struct net_device *netdev = to_net_dev(dev);
220 int ret = -EINVAL;
221
222 if (!rtnl_trylock())
223 return restart_syscall();
224
225 if (netif_running(netdev)) {
226 struct ethtool_link_ksettings cmd;
227
228 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
229 const char *duplex;
230
231 switch (cmd.base.duplex) {
232 case DUPLEX_HALF:
233 duplex = "half";
234 break;
235 case DUPLEX_FULL:
236 duplex = "full";
237 break;
238 default:
239 duplex = "unknown";
240 break;
241 }
242 ret = sprintf(buf, "%s\n", duplex);
243 }
244 }
245 rtnl_unlock();
246 return ret;
247}
248static DEVICE_ATTR_RO(duplex);
249
250static ssize_t dormant_show(struct device *dev,
251 struct device_attribute *attr, char *buf)
252{
253 struct net_device *netdev = to_net_dev(dev);
254
255 if (netif_running(netdev))
256 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
257
258 return -EINVAL;
259}
260static DEVICE_ATTR_RO(dormant);
261
262static const char *const operstates[] = {
263 "unknown",
264 "notpresent",
265 "down",
266 "lowerlayerdown",
267 "testing",
268 "dormant",
269 "up"
270};
271
272static ssize_t operstate_show(struct device *dev,
273 struct device_attribute *attr, char *buf)
274{
275 const struct net_device *netdev = to_net_dev(dev);
276 unsigned char operstate;
277
278 read_lock(&dev_base_lock);
279 operstate = netdev->operstate;
280 if (!netif_running(netdev))
281 operstate = IF_OPER_DOWN;
282 read_unlock(&dev_base_lock);
283
284 if (operstate >= ARRAY_SIZE(operstates))
285 return -EINVAL;
286
287 return sprintf(buf, "%s\n", operstates[operstate]);
288}
289static DEVICE_ATTR_RO(operstate);
290
291static ssize_t carrier_changes_show(struct device *dev,
292 struct device_attribute *attr,
293 char *buf)
294{
295 struct net_device *netdev = to_net_dev(dev);
296
297 return sprintf(buf, fmt_dec,
298 atomic_read(&netdev->carrier_up_count) +
299 atomic_read(&netdev->carrier_down_count));
300}
301static DEVICE_ATTR_RO(carrier_changes);
302
303static ssize_t carrier_up_count_show(struct device *dev,
304 struct device_attribute *attr,
305 char *buf)
306{
307 struct net_device *netdev = to_net_dev(dev);
308
309 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
310}
311static DEVICE_ATTR_RO(carrier_up_count);
312
313static ssize_t carrier_down_count_show(struct device *dev,
314 struct device_attribute *attr,
315 char *buf)
316{
317 struct net_device *netdev = to_net_dev(dev);
318
319 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
320}
321static DEVICE_ATTR_RO(carrier_down_count);
322
323
324
325static int change_mtu(struct net_device *dev, unsigned long new_mtu)
326{
327 return dev_set_mtu(dev, (int)new_mtu);
328}
329
330static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
331 const char *buf, size_t len)
332{
333 return netdev_store(dev, attr, buf, len, change_mtu);
334}
335NETDEVICE_SHOW_RW(mtu, fmt_dec);
336
337static int change_flags(struct net_device *dev, unsigned long new_flags)
338{
339 return dev_change_flags(dev, (unsigned int)new_flags, NULL);
340}
341
342static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
343 const char *buf, size_t len)
344{
345 return netdev_store(dev, attr, buf, len, change_flags);
346}
347NETDEVICE_SHOW_RW(flags, fmt_hex);
348
349static ssize_t tx_queue_len_store(struct device *dev,
350 struct device_attribute *attr,
351 const char *buf, size_t len)
352{
353 if (!capable(CAP_NET_ADMIN))
354 return -EPERM;
355
356 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
357}
358NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
359
360static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
361{
362 dev->gro_flush_timeout = val;
363 return 0;
364}
365
366static ssize_t gro_flush_timeout_store(struct device *dev,
367 struct device_attribute *attr,
368 const char *buf, size_t len)
369{
370 if (!capable(CAP_NET_ADMIN))
371 return -EPERM;
372
373 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
374}
375NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
376
377static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
378 const char *buf, size_t len)
379{
380 struct net_device *netdev = to_net_dev(dev);
381 struct net *net = dev_net(netdev);
382 size_t count = len;
383 ssize_t ret = 0;
384
385 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
386 return -EPERM;
387
388
389 if (len > 0 && buf[len - 1] == '\n')
390 --count;
391
392 if (!rtnl_trylock())
393 return restart_syscall();
394
395 if (dev_isalive(netdev)) {
396 ret = dev_set_alias(netdev, buf, count);
397 if (ret < 0)
398 goto err;
399 ret = len;
400 netdev_state_change(netdev);
401 }
402err:
403 rtnl_unlock();
404
405 return ret;
406}
407
408static ssize_t ifalias_show(struct device *dev,
409 struct device_attribute *attr, char *buf)
410{
411 const struct net_device *netdev = to_net_dev(dev);
412 char tmp[IFALIASZ];
413 ssize_t ret = 0;
414
415 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
416 if (ret > 0)
417 ret = sprintf(buf, "%s\n", tmp);
418 return ret;
419}
420static DEVICE_ATTR_RW(ifalias);
421
422static int change_group(struct net_device *dev, unsigned long new_group)
423{
424 dev_set_group(dev, (int)new_group);
425 return 0;
426}
427
428static ssize_t group_store(struct device *dev, struct device_attribute *attr,
429 const char *buf, size_t len)
430{
431 return netdev_store(dev, attr, buf, len, change_group);
432}
433NETDEVICE_SHOW(group, fmt_dec);
434static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
435
436static int change_proto_down(struct net_device *dev, unsigned long proto_down)
437{
438 return dev_change_proto_down(dev, (bool)proto_down);
439}
440
441static ssize_t proto_down_store(struct device *dev,
442 struct device_attribute *attr,
443 const char *buf, size_t len)
444{
445 return netdev_store(dev, attr, buf, len, change_proto_down);
446}
447NETDEVICE_SHOW_RW(proto_down, fmt_dec);
448
449static ssize_t phys_port_id_show(struct device *dev,
450 struct device_attribute *attr, char *buf)
451{
452 struct net_device *netdev = to_net_dev(dev);
453 ssize_t ret = -EINVAL;
454
455 if (!rtnl_trylock())
456 return restart_syscall();
457
458 if (dev_isalive(netdev)) {
459 struct netdev_phys_item_id ppid;
460
461 ret = dev_get_phys_port_id(netdev, &ppid);
462 if (!ret)
463 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
464 }
465 rtnl_unlock();
466
467 return ret;
468}
469static DEVICE_ATTR_RO(phys_port_id);
470
471static ssize_t phys_port_name_show(struct device *dev,
472 struct device_attribute *attr, char *buf)
473{
474 struct net_device *netdev = to_net_dev(dev);
475 ssize_t ret = -EINVAL;
476
477 if (!rtnl_trylock())
478 return restart_syscall();
479
480 if (dev_isalive(netdev)) {
481 char name[IFNAMSIZ];
482
483 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
484 if (!ret)
485 ret = sprintf(buf, "%s\n", name);
486 }
487 rtnl_unlock();
488
489 return ret;
490}
491static DEVICE_ATTR_RO(phys_port_name);
492
493static ssize_t phys_switch_id_show(struct device *dev,
494 struct device_attribute *attr, char *buf)
495{
496 struct net_device *netdev = to_net_dev(dev);
497 ssize_t ret = -EINVAL;
498
499 if (!rtnl_trylock())
500 return restart_syscall();
501
502 if (dev_isalive(netdev)) {
503 struct netdev_phys_item_id ppid = { };
504
505 ret = dev_get_port_parent_id(netdev, &ppid, false);
506 if (!ret)
507 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
508 }
509 rtnl_unlock();
510
511 return ret;
512}
513static DEVICE_ATTR_RO(phys_switch_id);
514
515static struct attribute *net_class_attrs[] __ro_after_init = {
516 &dev_attr_netdev_group.attr,
517 &dev_attr_type.attr,
518 &dev_attr_dev_id.attr,
519 &dev_attr_dev_port.attr,
520 &dev_attr_iflink.attr,
521 &dev_attr_ifindex.attr,
522 &dev_attr_name_assign_type.attr,
523 &dev_attr_addr_assign_type.attr,
524 &dev_attr_addr_len.attr,
525 &dev_attr_link_mode.attr,
526 &dev_attr_address.attr,
527 &dev_attr_broadcast.attr,
528 &dev_attr_speed.attr,
529 &dev_attr_duplex.attr,
530 &dev_attr_dormant.attr,
531 &dev_attr_operstate.attr,
532 &dev_attr_carrier_changes.attr,
533 &dev_attr_ifalias.attr,
534 &dev_attr_carrier.attr,
535 &dev_attr_mtu.attr,
536 &dev_attr_flags.attr,
537 &dev_attr_tx_queue_len.attr,
538 &dev_attr_gro_flush_timeout.attr,
539 &dev_attr_phys_port_id.attr,
540 &dev_attr_phys_port_name.attr,
541 &dev_attr_phys_switch_id.attr,
542 &dev_attr_proto_down.attr,
543 &dev_attr_carrier_up_count.attr,
544 &dev_attr_carrier_down_count.attr,
545 NULL,
546};
547ATTRIBUTE_GROUPS(net_class);
548
549
550static ssize_t netstat_show(const struct device *d,
551 struct device_attribute *attr, char *buf,
552 unsigned long offset)
553{
554 struct net_device *dev = to_net_dev(d);
555 ssize_t ret = -EINVAL;
556
557 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
558 offset % sizeof(u64) != 0);
559
560 read_lock(&dev_base_lock);
561 if (dev_isalive(dev)) {
562 struct rtnl_link_stats64 temp;
563 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
564
565 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
566 }
567 read_unlock(&dev_base_lock);
568 return ret;
569}
570
571
572#define NETSTAT_ENTRY(name) \
573static ssize_t name##_show(struct device *d, \
574 struct device_attribute *attr, char *buf) \
575{ \
576 return netstat_show(d, attr, buf, \
577 offsetof(struct rtnl_link_stats64, name)); \
578} \
579static DEVICE_ATTR_RO(name)
580
581NETSTAT_ENTRY(rx_packets);
582NETSTAT_ENTRY(tx_packets);
583NETSTAT_ENTRY(rx_bytes);
584NETSTAT_ENTRY(tx_bytes);
585NETSTAT_ENTRY(rx_errors);
586NETSTAT_ENTRY(tx_errors);
587NETSTAT_ENTRY(rx_dropped);
588NETSTAT_ENTRY(tx_dropped);
589NETSTAT_ENTRY(multicast);
590NETSTAT_ENTRY(collisions);
591NETSTAT_ENTRY(rx_length_errors);
592NETSTAT_ENTRY(rx_over_errors);
593NETSTAT_ENTRY(rx_crc_errors);
594NETSTAT_ENTRY(rx_frame_errors);
595NETSTAT_ENTRY(rx_fifo_errors);
596NETSTAT_ENTRY(rx_missed_errors);
597NETSTAT_ENTRY(tx_aborted_errors);
598NETSTAT_ENTRY(tx_carrier_errors);
599NETSTAT_ENTRY(tx_fifo_errors);
600NETSTAT_ENTRY(tx_heartbeat_errors);
601NETSTAT_ENTRY(tx_window_errors);
602NETSTAT_ENTRY(rx_compressed);
603NETSTAT_ENTRY(tx_compressed);
604NETSTAT_ENTRY(rx_nohandler);
605
606static struct attribute *netstat_attrs[] __ro_after_init = {
607 &dev_attr_rx_packets.attr,
608 &dev_attr_tx_packets.attr,
609 &dev_attr_rx_bytes.attr,
610 &dev_attr_tx_bytes.attr,
611 &dev_attr_rx_errors.attr,
612 &dev_attr_tx_errors.attr,
613 &dev_attr_rx_dropped.attr,
614 &dev_attr_tx_dropped.attr,
615 &dev_attr_multicast.attr,
616 &dev_attr_collisions.attr,
617 &dev_attr_rx_length_errors.attr,
618 &dev_attr_rx_over_errors.attr,
619 &dev_attr_rx_crc_errors.attr,
620 &dev_attr_rx_frame_errors.attr,
621 &dev_attr_rx_fifo_errors.attr,
622 &dev_attr_rx_missed_errors.attr,
623 &dev_attr_tx_aborted_errors.attr,
624 &dev_attr_tx_carrier_errors.attr,
625 &dev_attr_tx_fifo_errors.attr,
626 &dev_attr_tx_heartbeat_errors.attr,
627 &dev_attr_tx_window_errors.attr,
628 &dev_attr_rx_compressed.attr,
629 &dev_attr_tx_compressed.attr,
630 &dev_attr_rx_nohandler.attr,
631 NULL
632};
633
634static const struct attribute_group netstat_group = {
635 .name = "statistics",
636 .attrs = netstat_attrs,
637};
638
639#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
640static struct attribute *wireless_attrs[] = {
641 NULL
642};
643
644static const struct attribute_group wireless_group = {
645 .name = "wireless",
646 .attrs = wireless_attrs,
647};
648#endif
649
650#else
651#define net_class_groups NULL
652#endif
653
654#ifdef CONFIG_SYSFS
655#define to_rx_queue_attr(_attr) \
656 container_of(_attr, struct rx_queue_attribute, attr)
657
658#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
659
660static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
661 char *buf)
662{
663 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
664 struct netdev_rx_queue *queue = to_rx_queue(kobj);
665
666 if (!attribute->show)
667 return -EIO;
668
669 return attribute->show(queue, buf);
670}
671
672static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
673 const char *buf, size_t count)
674{
675 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
676 struct netdev_rx_queue *queue = to_rx_queue(kobj);
677
678 if (!attribute->store)
679 return -EIO;
680
681 return attribute->store(queue, buf, count);
682}
683
684static const struct sysfs_ops rx_queue_sysfs_ops = {
685 .show = rx_queue_attr_show,
686 .store = rx_queue_attr_store,
687};
688
689#ifdef CONFIG_RPS
690static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
691{
692 struct rps_map *map;
693 cpumask_var_t mask;
694 int i, len;
695
696 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
697 return -ENOMEM;
698
699 rcu_read_lock();
700 map = rcu_dereference(queue->rps_map);
701 if (map)
702 for (i = 0; i < map->len; i++)
703 cpumask_set_cpu(map->cpus[i], mask);
704
705 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
706 rcu_read_unlock();
707 free_cpumask_var(mask);
708
709 return len < PAGE_SIZE ? len : -EINVAL;
710}
711
712static ssize_t store_rps_map(struct netdev_rx_queue *queue,
713 const char *buf, size_t len)
714{
715 struct rps_map *old_map, *map;
716 cpumask_var_t mask;
717 int err, cpu, i;
718 static DEFINE_MUTEX(rps_map_mutex);
719
720 if (!capable(CAP_NET_ADMIN))
721 return -EPERM;
722
723 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
724 return -ENOMEM;
725
726 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
727 if (err) {
728 free_cpumask_var(mask);
729 return err;
730 }
731
732 map = kzalloc(max_t(unsigned int,
733 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
734 GFP_KERNEL);
735 if (!map) {
736 free_cpumask_var(mask);
737 return -ENOMEM;
738 }
739
740 i = 0;
741 for_each_cpu_and(cpu, mask, cpu_online_mask)
742 map->cpus[i++] = cpu;
743
744 if (i) {
745 map->len = i;
746 } else {
747 kfree(map);
748 map = NULL;
749 }
750
751 mutex_lock(&rps_map_mutex);
752 old_map = rcu_dereference_protected(queue->rps_map,
753 mutex_is_locked(&rps_map_mutex));
754 rcu_assign_pointer(queue->rps_map, map);
755
756 if (map)
757 static_key_slow_inc(&rps_needed);
758 if (old_map)
759 static_key_slow_dec(&rps_needed);
760
761 mutex_unlock(&rps_map_mutex);
762
763 if (old_map)
764 kfree_rcu(old_map, rcu);
765
766 free_cpumask_var(mask);
767 return len;
768}
769
770static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
771 char *buf)
772{
773 struct rps_dev_flow_table *flow_table;
774 unsigned long val = 0;
775
776 rcu_read_lock();
777 flow_table = rcu_dereference(queue->rps_flow_table);
778 if (flow_table)
779 val = (unsigned long)flow_table->mask + 1;
780 rcu_read_unlock();
781
782 return sprintf(buf, "%lu\n", val);
783}
784
785static void rps_dev_flow_table_release(struct rcu_head *rcu)
786{
787 struct rps_dev_flow_table *table = container_of(rcu,
788 struct rps_dev_flow_table, rcu);
789 vfree(table);
790}
791
792static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
793 const char *buf, size_t len)
794{
795 unsigned long mask, count;
796 struct rps_dev_flow_table *table, *old_table;
797 static DEFINE_SPINLOCK(rps_dev_flow_lock);
798 int rc;
799
800 if (!capable(CAP_NET_ADMIN))
801 return -EPERM;
802
803 rc = kstrtoul(buf, 0, &count);
804 if (rc < 0)
805 return rc;
806
807 if (count) {
808 mask = count - 1;
809
810
811
812 while ((mask | (mask >> 1)) != mask)
813 mask |= (mask >> 1);
814
815
816
817
818#if BITS_PER_LONG > 32
819 if (mask > (unsigned long)(u32)mask)
820 return -EINVAL;
821#else
822 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
823 / sizeof(struct rps_dev_flow)) {
824
825 return -EINVAL;
826 }
827#endif
828 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
829 if (!table)
830 return -ENOMEM;
831
832 table->mask = mask;
833 for (count = 0; count <= mask; count++)
834 table->flows[count].cpu = RPS_NO_CPU;
835 } else {
836 table = NULL;
837 }
838
839 spin_lock(&rps_dev_flow_lock);
840 old_table = rcu_dereference_protected(queue->rps_flow_table,
841 lockdep_is_held(&rps_dev_flow_lock));
842 rcu_assign_pointer(queue->rps_flow_table, table);
843 spin_unlock(&rps_dev_flow_lock);
844
845 if (old_table)
846 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
847
848 return len;
849}
850
851static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
852 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
853
854static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
855 = __ATTR(rps_flow_cnt, 0644,
856 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
857#endif
858
859static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
860#ifdef CONFIG_RPS
861 &rps_cpus_attribute.attr,
862 &rps_dev_flow_table_cnt_attribute.attr,
863#endif
864 NULL
865};
866
867static void rx_queue_release(struct kobject *kobj)
868{
869 struct netdev_rx_queue *queue = to_rx_queue(kobj);
870#ifdef CONFIG_RPS
871 struct rps_map *map;
872 struct rps_dev_flow_table *flow_table;
873
874 map = rcu_dereference_protected(queue->rps_map, 1);
875 if (map) {
876 RCU_INIT_POINTER(queue->rps_map, NULL);
877 kfree_rcu(map, rcu);
878 }
879
880 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
881 if (flow_table) {
882 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
883 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
884 }
885#endif
886
887 memset(kobj, 0, sizeof(*kobj));
888 dev_put(queue->dev);
889}
890
891static const void *rx_queue_namespace(struct kobject *kobj)
892{
893 struct netdev_rx_queue *queue = to_rx_queue(kobj);
894 struct device *dev = &queue->dev->dev;
895 const void *ns = NULL;
896
897 if (dev->class && dev->class->ns_type)
898 ns = dev->class->namespace(dev);
899
900 return ns;
901}
902
903static void rx_queue_get_ownership(struct kobject *kobj,
904 kuid_t *uid, kgid_t *gid)
905{
906 const struct net *net = rx_queue_namespace(kobj);
907
908 net_ns_get_ownership(net, uid, gid);
909}
910
911static struct kobj_type rx_queue_ktype __ro_after_init = {
912 .sysfs_ops = &rx_queue_sysfs_ops,
913 .release = rx_queue_release,
914 .default_attrs = rx_queue_default_attrs,
915 .namespace = rx_queue_namespace,
916 .get_ownership = rx_queue_get_ownership,
917};
918
919static int rx_queue_add_kobject(struct net_device *dev, int index)
920{
921 struct netdev_rx_queue *queue = dev->_rx + index;
922 struct kobject *kobj = &queue->kobj;
923 int error = 0;
924
925 kobj->kset = dev->queues_kset;
926 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
927 "rx-%u", index);
928 if (error)
929 return error;
930
931 dev_hold(queue->dev);
932
933 if (dev->sysfs_rx_queue_group) {
934 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
935 if (error) {
936 kobject_put(kobj);
937 return error;
938 }
939 }
940
941 kobject_uevent(kobj, KOBJ_ADD);
942
943 return error;
944}
945#endif
946
947int
948net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
949{
950#ifdef CONFIG_SYSFS
951 int i;
952 int error = 0;
953
954#ifndef CONFIG_RPS
955 if (!dev->sysfs_rx_queue_group)
956 return 0;
957#endif
958 for (i = old_num; i < new_num; i++) {
959 error = rx_queue_add_kobject(dev, i);
960 if (error) {
961 new_num = old_num;
962 break;
963 }
964 }
965
966 while (--i >= new_num) {
967 struct kobject *kobj = &dev->_rx[i].kobj;
968
969 if (!refcount_read(&dev_net(dev)->count))
970 kobj->uevent_suppress = 1;
971 if (dev->sysfs_rx_queue_group)
972 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
973 kobject_put(kobj);
974 }
975
976 return error;
977#else
978 return 0;
979#endif
980}
981
982#ifdef CONFIG_SYSFS
983
984
985
986struct netdev_queue_attribute {
987 struct attribute attr;
988 ssize_t (*show)(struct netdev_queue *queue, char *buf);
989 ssize_t (*store)(struct netdev_queue *queue,
990 const char *buf, size_t len);
991};
992#define to_netdev_queue_attr(_attr) \
993 container_of(_attr, struct netdev_queue_attribute, attr)
994
995#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
996
997static ssize_t netdev_queue_attr_show(struct kobject *kobj,
998 struct attribute *attr, char *buf)
999{
1000 const struct netdev_queue_attribute *attribute
1001 = to_netdev_queue_attr(attr);
1002 struct netdev_queue *queue = to_netdev_queue(kobj);
1003
1004 if (!attribute->show)
1005 return -EIO;
1006
1007 return attribute->show(queue, buf);
1008}
1009
1010static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1011 struct attribute *attr,
1012 const char *buf, size_t count)
1013{
1014 const struct netdev_queue_attribute *attribute
1015 = to_netdev_queue_attr(attr);
1016 struct netdev_queue *queue = to_netdev_queue(kobj);
1017
1018 if (!attribute->store)
1019 return -EIO;
1020
1021 return attribute->store(queue, buf, count);
1022}
1023
1024static const struct sysfs_ops netdev_queue_sysfs_ops = {
1025 .show = netdev_queue_attr_show,
1026 .store = netdev_queue_attr_store,
1027};
1028
1029static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1030{
1031 unsigned long trans_timeout;
1032
1033 spin_lock_irq(&queue->_xmit_lock);
1034 trans_timeout = queue->trans_timeout;
1035 spin_unlock_irq(&queue->_xmit_lock);
1036
1037 return sprintf(buf, "%lu", trans_timeout);
1038}
1039
1040static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1041{
1042 struct net_device *dev = queue->dev;
1043 unsigned int i;
1044
1045 i = queue - dev->_tx;
1046 BUG_ON(i >= dev->num_tx_queues);
1047
1048 return i;
1049}
1050
1051static ssize_t traffic_class_show(struct netdev_queue *queue,
1052 char *buf)
1053{
1054 struct net_device *dev = queue->dev;
1055 int index;
1056 int tc;
1057
1058 if (!netif_is_multiqueue(dev))
1059 return -ENOENT;
1060
1061 index = get_netdev_queue_index(queue);
1062
1063
1064 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1065
1066 tc = netdev_txq_to_tc(dev, index);
1067 if (tc < 0)
1068 return -EINVAL;
1069
1070
1071
1072
1073
1074
1075
1076
1077 return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1078 sprintf(buf, "%u\n", tc);
1079}
1080
1081#ifdef CONFIG_XPS
1082static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1083 char *buf)
1084{
1085 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1086}
1087
1088static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1089 const char *buf, size_t len)
1090{
1091 struct net_device *dev = queue->dev;
1092 int err, index = get_netdev_queue_index(queue);
1093 u32 rate = 0;
1094
1095 if (!capable(CAP_NET_ADMIN))
1096 return -EPERM;
1097
1098 err = kstrtou32(buf, 10, &rate);
1099 if (err < 0)
1100 return err;
1101
1102 if (!rtnl_trylock())
1103 return restart_syscall();
1104
1105 err = -EOPNOTSUPP;
1106 if (dev->netdev_ops->ndo_set_tx_maxrate)
1107 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1108
1109 rtnl_unlock();
1110 if (!err) {
1111 queue->tx_maxrate = rate;
1112 return len;
1113 }
1114 return err;
1115}
1116
1117static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1118 = __ATTR_RW(tx_maxrate);
1119#endif
1120
1121static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1122 = __ATTR_RO(tx_timeout);
1123
1124static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1125 = __ATTR_RO(traffic_class);
1126
1127#ifdef CONFIG_BQL
1128
1129
1130
1131static ssize_t bql_show(char *buf, unsigned int value)
1132{
1133 return sprintf(buf, "%u\n", value);
1134}
1135
1136static ssize_t bql_set(const char *buf, const size_t count,
1137 unsigned int *pvalue)
1138{
1139 unsigned int value;
1140 int err;
1141
1142 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1143 value = DQL_MAX_LIMIT;
1144 } else {
1145 err = kstrtouint(buf, 10, &value);
1146 if (err < 0)
1147 return err;
1148 if (value > DQL_MAX_LIMIT)
1149 return -EINVAL;
1150 }
1151
1152 *pvalue = value;
1153
1154 return count;
1155}
1156
1157static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1158 char *buf)
1159{
1160 struct dql *dql = &queue->dql;
1161
1162 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1163}
1164
1165static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1166 const char *buf, size_t len)
1167{
1168 struct dql *dql = &queue->dql;
1169 unsigned int value;
1170 int err;
1171
1172 err = kstrtouint(buf, 10, &value);
1173 if (err < 0)
1174 return err;
1175
1176 dql->slack_hold_time = msecs_to_jiffies(value);
1177
1178 return len;
1179}
1180
1181static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1182 = __ATTR(hold_time, 0644,
1183 bql_show_hold_time, bql_set_hold_time);
1184
1185static ssize_t bql_show_inflight(struct netdev_queue *queue,
1186 char *buf)
1187{
1188 struct dql *dql = &queue->dql;
1189
1190 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1191}
1192
1193static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1194 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1195
1196#define BQL_ATTR(NAME, FIELD) \
1197static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1198 char *buf) \
1199{ \
1200 return bql_show(buf, queue->dql.FIELD); \
1201} \
1202 \
1203static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1204 const char *buf, size_t len) \
1205{ \
1206 return bql_set(buf, len, &queue->dql.FIELD); \
1207} \
1208 \
1209static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1210 = __ATTR(NAME, 0644, \
1211 bql_show_ ## NAME, bql_set_ ## NAME)
1212
1213BQL_ATTR(limit, limit);
1214BQL_ATTR(limit_max, max_limit);
1215BQL_ATTR(limit_min, min_limit);
1216
1217static struct attribute *dql_attrs[] __ro_after_init = {
1218 &bql_limit_attribute.attr,
1219 &bql_limit_max_attribute.attr,
1220 &bql_limit_min_attribute.attr,
1221 &bql_hold_time_attribute.attr,
1222 &bql_inflight_attribute.attr,
1223 NULL
1224};
1225
1226static const struct attribute_group dql_group = {
1227 .name = "byte_queue_limits",
1228 .attrs = dql_attrs,
1229};
1230#endif
1231
1232#ifdef CONFIG_XPS
1233static ssize_t xps_cpus_show(struct netdev_queue *queue,
1234 char *buf)
1235{
1236 struct net_device *dev = queue->dev;
1237 int cpu, len, num_tc = 1, tc = 0;
1238 struct xps_dev_maps *dev_maps;
1239 cpumask_var_t mask;
1240 unsigned long index;
1241
1242 if (!netif_is_multiqueue(dev))
1243 return -ENOENT;
1244
1245 index = get_netdev_queue_index(queue);
1246
1247 if (dev->num_tc) {
1248
1249 num_tc = dev->num_tc;
1250 if (num_tc < 0)
1251 return -EINVAL;
1252
1253
1254 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1255
1256 tc = netdev_txq_to_tc(dev, index);
1257 if (tc < 0)
1258 return -EINVAL;
1259 }
1260
1261 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1262 return -ENOMEM;
1263
1264 rcu_read_lock();
1265 dev_maps = rcu_dereference(dev->xps_cpus_map);
1266 if (dev_maps) {
1267 for_each_possible_cpu(cpu) {
1268 int i, tci = cpu * num_tc + tc;
1269 struct xps_map *map;
1270
1271 map = rcu_dereference(dev_maps->attr_map[tci]);
1272 if (!map)
1273 continue;
1274
1275 for (i = map->len; i--;) {
1276 if (map->queues[i] == index) {
1277 cpumask_set_cpu(cpu, mask);
1278 break;
1279 }
1280 }
1281 }
1282 }
1283 rcu_read_unlock();
1284
1285 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1286 free_cpumask_var(mask);
1287 return len < PAGE_SIZE ? len : -EINVAL;
1288}
1289
1290static ssize_t xps_cpus_store(struct netdev_queue *queue,
1291 const char *buf, size_t len)
1292{
1293 struct net_device *dev = queue->dev;
1294 unsigned long index;
1295 cpumask_var_t mask;
1296 int err;
1297
1298 if (!netif_is_multiqueue(dev))
1299 return -ENOENT;
1300
1301 if (!capable(CAP_NET_ADMIN))
1302 return -EPERM;
1303
1304 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1305 return -ENOMEM;
1306
1307 index = get_netdev_queue_index(queue);
1308
1309 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1310 if (err) {
1311 free_cpumask_var(mask);
1312 return err;
1313 }
1314
1315 err = netif_set_xps_queue(dev, mask, index);
1316
1317 free_cpumask_var(mask);
1318
1319 return err ? : len;
1320}
1321
1322static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1323 = __ATTR_RW(xps_cpus);
1324
1325static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1326{
1327 struct net_device *dev = queue->dev;
1328 struct xps_dev_maps *dev_maps;
1329 unsigned long *mask, index;
1330 int j, len, num_tc = 1, tc = 0;
1331
1332 index = get_netdev_queue_index(queue);
1333
1334 if (dev->num_tc) {
1335 num_tc = dev->num_tc;
1336 tc = netdev_txq_to_tc(dev, index);
1337 if (tc < 0)
1338 return -EINVAL;
1339 }
1340 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1341 if (!mask)
1342 return -ENOMEM;
1343
1344 rcu_read_lock();
1345 dev_maps = rcu_dereference(dev->xps_rxqs_map);
1346 if (!dev_maps)
1347 goto out_no_maps;
1348
1349 for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1350 j < dev->num_rx_queues;) {
1351 int i, tci = j * num_tc + tc;
1352 struct xps_map *map;
1353
1354 map = rcu_dereference(dev_maps->attr_map[tci]);
1355 if (!map)
1356 continue;
1357
1358 for (i = map->len; i--;) {
1359 if (map->queues[i] == index) {
1360 set_bit(j, mask);
1361 break;
1362 }
1363 }
1364 }
1365out_no_maps:
1366 rcu_read_unlock();
1367
1368 len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1369 bitmap_free(mask);
1370
1371 return len < PAGE_SIZE ? len : -EINVAL;
1372}
1373
1374static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1375 size_t len)
1376{
1377 struct net_device *dev = queue->dev;
1378 struct net *net = dev_net(dev);
1379 unsigned long *mask, index;
1380 int err;
1381
1382 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1383 return -EPERM;
1384
1385 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1386 if (!mask)
1387 return -ENOMEM;
1388
1389 index = get_netdev_queue_index(queue);
1390
1391 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1392 if (err) {
1393 bitmap_free(mask);
1394 return err;
1395 }
1396
1397 cpus_read_lock();
1398 err = __netif_set_xps_queue(dev, mask, index, true);
1399 cpus_read_unlock();
1400
1401 bitmap_free(mask);
1402 return err ? : len;
1403}
1404
1405static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1406 = __ATTR_RW(xps_rxqs);
1407#endif
1408
1409static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1410 &queue_trans_timeout.attr,
1411 &queue_traffic_class.attr,
1412#ifdef CONFIG_XPS
1413 &xps_cpus_attribute.attr,
1414 &xps_rxqs_attribute.attr,
1415 &queue_tx_maxrate.attr,
1416#endif
1417 NULL
1418};
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_attrs = netdev_queue_default_attrs,
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 return error;
1467
1468 dev_hold(queue->dev);
1469
1470#ifdef CONFIG_BQL
1471 error = sysfs_create_group(kobj, &dql_group);
1472 if (error) {
1473 kobject_put(kobj);
1474 return error;
1475 }
1476#endif
1477
1478 kobject_uevent(kobj, KOBJ_ADD);
1479
1480 return 0;
1481}
1482#endif
1483
1484int
1485netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1486{
1487#ifdef CONFIG_SYSFS
1488 int i;
1489 int error = 0;
1490
1491 for (i = old_num; i < new_num; i++) {
1492 error = netdev_queue_add_kobject(dev, i);
1493 if (error) {
1494 new_num = old_num;
1495 break;
1496 }
1497 }
1498
1499 while (--i >= new_num) {
1500 struct netdev_queue *queue = dev->_tx + i;
1501
1502 if (!refcount_read(&dev_net(dev)->count))
1503 queue->kobj.uevent_suppress = 1;
1504#ifdef CONFIG_BQL
1505 sysfs_remove_group(&queue->kobj, &dql_group);
1506#endif
1507 kobject_put(&queue->kobj);
1508 }
1509
1510 return error;
1511#else
1512 return 0;
1513#endif
1514}
1515
1516static int register_queue_kobjects(struct net_device *dev)
1517{
1518 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1519
1520#ifdef CONFIG_SYSFS
1521 dev->queues_kset = kset_create_and_add("queues",
1522 NULL, &dev->dev.kobj);
1523 if (!dev->queues_kset)
1524 return -ENOMEM;
1525 real_rx = dev->real_num_rx_queues;
1526#endif
1527 real_tx = dev->real_num_tx_queues;
1528
1529 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1530 if (error)
1531 goto error;
1532 rxq = real_rx;
1533
1534 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1535 if (error)
1536 goto error;
1537 txq = real_tx;
1538
1539 return 0;
1540
1541error:
1542 netdev_queue_update_kobjects(dev, txq, 0);
1543 net_rx_queue_update_kobjects(dev, rxq, 0);
1544#ifdef CONFIG_SYSFS
1545 kset_unregister(dev->queues_kset);
1546#endif
1547 return error;
1548}
1549
1550static void remove_queue_kobjects(struct net_device *dev)
1551{
1552 int real_rx = 0, real_tx = 0;
1553
1554#ifdef CONFIG_SYSFS
1555 real_rx = dev->real_num_rx_queues;
1556#endif
1557 real_tx = dev->real_num_tx_queues;
1558
1559 net_rx_queue_update_kobjects(dev, real_rx, 0);
1560 netdev_queue_update_kobjects(dev, real_tx, 0);
1561#ifdef CONFIG_SYSFS
1562 kset_unregister(dev->queues_kset);
1563#endif
1564}
1565
1566static bool net_current_may_mount(void)
1567{
1568 struct net *net = current->nsproxy->net_ns;
1569
1570 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1571}
1572
1573static void *net_grab_current_ns(void)
1574{
1575 struct net *ns = current->nsproxy->net_ns;
1576#ifdef CONFIG_NET_NS
1577 if (ns)
1578 refcount_inc(&ns->passive);
1579#endif
1580 return ns;
1581}
1582
1583static const void *net_initial_ns(void)
1584{
1585 return &init_net;
1586}
1587
1588static const void *net_netlink_ns(struct sock *sk)
1589{
1590 return sock_net(sk);
1591}
1592
1593const struct kobj_ns_type_operations net_ns_type_operations = {
1594 .type = KOBJ_NS_TYPE_NET,
1595 .current_may_mount = net_current_may_mount,
1596 .grab_current_ns = net_grab_current_ns,
1597 .netlink_ns = net_netlink_ns,
1598 .initial_ns = net_initial_ns,
1599 .drop_ns = net_drop_ns,
1600};
1601EXPORT_SYMBOL_GPL(net_ns_type_operations);
1602
1603static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1604{
1605 struct net_device *dev = to_net_dev(d);
1606 int retval;
1607
1608
1609 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1610 if (retval)
1611 goto exit;
1612
1613
1614
1615
1616
1617 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1618
1619exit:
1620 return retval;
1621}
1622
1623
1624
1625
1626
1627static void netdev_release(struct device *d)
1628{
1629 struct net_device *dev = to_net_dev(d);
1630
1631 BUG_ON(dev->reg_state != NETREG_RELEASED);
1632
1633
1634
1635
1636 kfree(rcu_access_pointer(dev->ifalias));
1637 netdev_freemem(dev);
1638}
1639
1640static const void *net_namespace(struct device *d)
1641{
1642 struct net_device *dev = to_net_dev(d);
1643
1644 return dev_net(dev);
1645}
1646
1647static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1648{
1649 struct net_device *dev = to_net_dev(d);
1650 const struct net *net = dev_net(dev);
1651
1652 net_ns_get_ownership(net, uid, gid);
1653}
1654
1655static struct class net_class __ro_after_init = {
1656 .name = "net",
1657 .dev_release = netdev_release,
1658 .dev_groups = net_class_groups,
1659 .dev_uevent = netdev_uevent,
1660 .ns_type = &net_ns_type_operations,
1661 .namespace = net_namespace,
1662 .get_ownership = net_get_ownership,
1663};
1664
1665#ifdef CONFIG_OF_NET
1666static int of_dev_node_match(struct device *dev, const void *data)
1667{
1668 int ret = 0;
1669
1670 if (dev->parent)
1671 ret = dev->parent->of_node == data;
1672
1673 return ret == 0 ? dev->of_node == data : ret;
1674}
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685struct net_device *of_find_net_device_by_node(struct device_node *np)
1686{
1687 struct device *dev;
1688
1689 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1690 if (!dev)
1691 return NULL;
1692
1693 return to_net_dev(dev);
1694}
1695EXPORT_SYMBOL(of_find_net_device_by_node);
1696#endif
1697
1698
1699
1700
1701void netdev_unregister_kobject(struct net_device *ndev)
1702{
1703 struct device *dev = &ndev->dev;
1704
1705 if (!refcount_read(&dev_net(ndev)->count))
1706 dev_set_uevent_suppress(dev, 1);
1707
1708 kobject_get(&dev->kobj);
1709
1710 remove_queue_kobjects(ndev);
1711
1712 pm_runtime_set_memalloc_noio(dev, false);
1713
1714 device_del(dev);
1715}
1716
1717
1718int netdev_register_kobject(struct net_device *ndev)
1719{
1720 struct device *dev = &ndev->dev;
1721 const struct attribute_group **groups = ndev->sysfs_groups;
1722 int error = 0;
1723
1724 device_initialize(dev);
1725 dev->class = &net_class;
1726 dev->platform_data = ndev;
1727 dev->groups = groups;
1728
1729 dev_set_name(dev, "%s", ndev->name);
1730
1731#ifdef CONFIG_SYSFS
1732
1733 if (*groups)
1734 groups++;
1735
1736 *groups++ = &netstat_group;
1737
1738#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1739 if (ndev->ieee80211_ptr)
1740 *groups++ = &wireless_group;
1741#if IS_ENABLED(CONFIG_WIRELESS_EXT)
1742 else if (ndev->wireless_handlers)
1743 *groups++ = &wireless_group;
1744#endif
1745#endif
1746#endif
1747
1748 error = device_add(dev);
1749 if (error)
1750 return error;
1751
1752 error = register_queue_kobjects(ndev);
1753 if (error) {
1754 device_del(dev);
1755 return error;
1756 }
1757
1758 pm_runtime_set_memalloc_noio(dev, true);
1759
1760 return error;
1761}
1762
1763int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1764 const void *ns)
1765{
1766 return class_create_file_ns(&net_class, class_attr, ns);
1767}
1768EXPORT_SYMBOL(netdev_class_create_file_ns);
1769
1770void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1771 const void *ns)
1772{
1773 class_remove_file_ns(&net_class, class_attr, ns);
1774}
1775EXPORT_SYMBOL(netdev_class_remove_file_ns);
1776
1777int __init netdev_kobject_init(void)
1778{
1779 kobj_ns_type_register(&net_ns_type_operations);
1780 return class_register(&net_class);
1781}
1782
