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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
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
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
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
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",
261 "down",
262 "lowerlayerdown",
263 "testing",
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;
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
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
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
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
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
647#define net_class_groups NULL
648#endif
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
806
807
808 while ((mask | (mask >> 1)) != mask)
809 mask |= (mask >> 1);
810
811
812
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
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
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 return error;
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 kobject_put(kobj);
934 return error;
935 }
936 }
937
938 kobject_uevent(kobj, KOBJ_ADD);
939
940 return error;
941}
942#endif
943
944int
945net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
946{
947#ifdef CONFIG_SYSFS
948 int i;
949 int error = 0;
950
951#ifndef CONFIG_RPS
952 if (!dev->sysfs_rx_queue_group)
953 return 0;
954#endif
955 for (i = old_num; i < new_num; i++) {
956 error = rx_queue_add_kobject(dev, i);
957 if (error) {
958 new_num = old_num;
959 break;
960 }
961 }
962
963 while (--i >= new_num) {
964 struct kobject *kobj = &dev->_rx[i].kobj;
965
966 if (!refcount_read(&dev_net(dev)->count))
967 kobj->uevent_suppress = 1;
968 if (dev->sysfs_rx_queue_group)
969 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
970 kobject_put(kobj);
971 }
972
973 return error;
974#else
975 return 0;
976#endif
977}
978
979#ifdef CONFIG_SYSFS
980
981
982
983struct netdev_queue_attribute {
984 struct attribute attr;
985 ssize_t (*show)(struct netdev_queue *queue, char *buf);
986 ssize_t (*store)(struct netdev_queue *queue,
987 const char *buf, size_t len);
988};
989#define to_netdev_queue_attr(_attr) \
990 container_of(_attr, struct netdev_queue_attribute, attr)
991
992#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
993
994static ssize_t netdev_queue_attr_show(struct kobject *kobj,
995 struct attribute *attr, char *buf)
996{
997 const struct netdev_queue_attribute *attribute
998 = to_netdev_queue_attr(attr);
999 struct netdev_queue *queue = to_netdev_queue(kobj);
1000
1001 if (!attribute->show)
1002 return -EIO;
1003
1004 return attribute->show(queue, buf);
1005}
1006
1007static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1008 struct attribute *attr,
1009 const char *buf, size_t count)
1010{
1011 const struct netdev_queue_attribute *attribute
1012 = to_netdev_queue_attr(attr);
1013 struct netdev_queue *queue = to_netdev_queue(kobj);
1014
1015 if (!attribute->store)
1016 return -EIO;
1017
1018 return attribute->store(queue, buf, count);
1019}
1020
1021static const struct sysfs_ops netdev_queue_sysfs_ops = {
1022 .show = netdev_queue_attr_show,
1023 .store = netdev_queue_attr_store,
1024};
1025
1026static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1027{
1028 unsigned long trans_timeout;
1029
1030 spin_lock_irq(&queue->_xmit_lock);
1031 trans_timeout = queue->trans_timeout;
1032 spin_unlock_irq(&queue->_xmit_lock);
1033
1034 return sprintf(buf, "%lu", trans_timeout);
1035}
1036
1037static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1038{
1039 struct net_device *dev = queue->dev;
1040 unsigned int i;
1041
1042 i = queue - dev->_tx;
1043 BUG_ON(i >= dev->num_tx_queues);
1044
1045 return i;
1046}
1047
1048static ssize_t traffic_class_show(struct netdev_queue *queue,
1049 char *buf)
1050{
1051 struct net_device *dev = queue->dev;
1052 int index;
1053 int tc;
1054
1055 if (!netif_is_multiqueue(dev))
1056 return -ENOENT;
1057
1058 index = get_netdev_queue_index(queue);
1059
1060
1061 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1062
1063 tc = netdev_txq_to_tc(dev, index);
1064 if (tc < 0)
1065 return -EINVAL;
1066
1067
1068
1069
1070
1071
1072
1073
1074 return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1075 sprintf(buf, "%u\n", tc);
1076}
1077
1078#ifdef CONFIG_XPS
1079static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1080 char *buf)
1081{
1082 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1083}
1084
1085static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1086 const char *buf, size_t len)
1087{
1088 struct net_device *dev = queue->dev;
1089 int err, index = get_netdev_queue_index(queue);
1090 u32 rate = 0;
1091
1092 if (!capable(CAP_NET_ADMIN))
1093 return -EPERM;
1094
1095 err = kstrtou32(buf, 10, &rate);
1096 if (err < 0)
1097 return err;
1098
1099 if (!rtnl_trylock())
1100 return restart_syscall();
1101
1102 err = -EOPNOTSUPP;
1103 if (dev->netdev_ops->ndo_set_tx_maxrate)
1104 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1105
1106 rtnl_unlock();
1107 if (!err) {
1108 queue->tx_maxrate = rate;
1109 return len;
1110 }
1111 return err;
1112}
1113
1114static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1115 = __ATTR_RW(tx_maxrate);
1116#endif
1117
1118static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1119 = __ATTR_RO(tx_timeout);
1120
1121static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1122 = __ATTR_RO(traffic_class);
1123
1124#ifdef CONFIG_BQL
1125
1126
1127
1128static ssize_t bql_show(char *buf, unsigned int value)
1129{
1130 return sprintf(buf, "%u\n", value);
1131}
1132
1133static ssize_t bql_set(const char *buf, const size_t count,
1134 unsigned int *pvalue)
1135{
1136 unsigned int value;
1137 int err;
1138
1139 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1140 value = DQL_MAX_LIMIT;
1141 } else {
1142 err = kstrtouint(buf, 10, &value);
1143 if (err < 0)
1144 return err;
1145 if (value > DQL_MAX_LIMIT)
1146 return -EINVAL;
1147 }
1148
1149 *pvalue = value;
1150
1151 return count;
1152}
1153
1154static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1155 char *buf)
1156{
1157 struct dql *dql = &queue->dql;
1158
1159 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1160}
1161
1162static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1163 const char *buf, size_t len)
1164{
1165 struct dql *dql = &queue->dql;
1166 unsigned int value;
1167 int err;
1168
1169 err = kstrtouint(buf, 10, &value);
1170 if (err < 0)
1171 return err;
1172
1173 dql->slack_hold_time = msecs_to_jiffies(value);
1174
1175 return len;
1176}
1177
1178static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1179 = __ATTR(hold_time, 0644,
1180 bql_show_hold_time, bql_set_hold_time);
1181
1182static ssize_t bql_show_inflight(struct netdev_queue *queue,
1183 char *buf)
1184{
1185 struct dql *dql = &queue->dql;
1186
1187 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1188}
1189
1190static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1191 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1192
1193#define BQL_ATTR(NAME, FIELD) \
1194static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1195 char *buf) \
1196{ \
1197 return bql_show(buf, queue->dql.FIELD); \
1198} \
1199 \
1200static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1201 const char *buf, size_t len) \
1202{ \
1203 return bql_set(buf, len, &queue->dql.FIELD); \
1204} \
1205 \
1206static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1207 = __ATTR(NAME, 0644, \
1208 bql_show_ ## NAME, bql_set_ ## NAME)
1209
1210BQL_ATTR(limit, limit);
1211BQL_ATTR(limit_max, max_limit);
1212BQL_ATTR(limit_min, min_limit);
1213
1214static struct attribute *dql_attrs[] __ro_after_init = {
1215 &bql_limit_attribute.attr,
1216 &bql_limit_max_attribute.attr,
1217 &bql_limit_min_attribute.attr,
1218 &bql_hold_time_attribute.attr,
1219 &bql_inflight_attribute.attr,
1220 NULL
1221};
1222
1223static const struct attribute_group dql_group = {
1224 .name = "byte_queue_limits",
1225 .attrs = dql_attrs,
1226};
1227#endif
1228
1229#ifdef CONFIG_XPS
1230static ssize_t xps_cpus_show(struct netdev_queue *queue,
1231 char *buf)
1232{
1233 struct net_device *dev = queue->dev;
1234 int cpu, len, num_tc = 1, tc = 0;
1235 struct xps_dev_maps *dev_maps;
1236 cpumask_var_t mask;
1237 unsigned long index;
1238
1239 if (!netif_is_multiqueue(dev))
1240 return -ENOENT;
1241
1242 index = get_netdev_queue_index(queue);
1243
1244 if (dev->num_tc) {
1245
1246 num_tc = dev->num_tc;
1247 if (num_tc < 0)
1248 return -EINVAL;
1249
1250
1251 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1252
1253 tc = netdev_txq_to_tc(dev, index);
1254 if (tc < 0)
1255 return -EINVAL;
1256 }
1257
1258 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1259 return -ENOMEM;
1260
1261 rcu_read_lock();
1262 dev_maps = rcu_dereference(dev->xps_cpus_map);
1263 if (dev_maps) {
1264 for_each_possible_cpu(cpu) {
1265 int i, tci = cpu * num_tc + tc;
1266 struct xps_map *map;
1267
1268 map = rcu_dereference(dev_maps->attr_map[tci]);
1269 if (!map)
1270 continue;
1271
1272 for (i = map->len; i--;) {
1273 if (map->queues[i] == index) {
1274 cpumask_set_cpu(cpu, mask);
1275 break;
1276 }
1277 }
1278 }
1279 }
1280 rcu_read_unlock();
1281
1282 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1283 free_cpumask_var(mask);
1284 return len < PAGE_SIZE ? len : -EINVAL;
1285}
1286
1287static ssize_t xps_cpus_store(struct netdev_queue *queue,
1288 const char *buf, size_t len)
1289{
1290 struct net_device *dev = queue->dev;
1291 unsigned long index;
1292 cpumask_var_t mask;
1293 int err;
1294
1295 if (!netif_is_multiqueue(dev))
1296 return -ENOENT;
1297
1298 if (!capable(CAP_NET_ADMIN))
1299 return -EPERM;
1300
1301 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1302 return -ENOMEM;
1303
1304 index = get_netdev_queue_index(queue);
1305
1306 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1307 if (err) {
1308 free_cpumask_var(mask);
1309 return err;
1310 }
1311
1312 err = netif_set_xps_queue(dev, mask, index);
1313
1314 free_cpumask_var(mask);
1315
1316 return err ? : len;
1317}
1318
1319static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1320 = __ATTR_RW(xps_cpus);
1321
1322static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1323{
1324 struct net_device *dev = queue->dev;
1325 struct xps_dev_maps *dev_maps;
1326 unsigned long *mask, index;
1327 int j, len, num_tc = 1, tc = 0;
1328
1329 index = get_netdev_queue_index(queue);
1330
1331 if (dev->num_tc) {
1332 num_tc = dev->num_tc;
1333 tc = netdev_txq_to_tc(dev, index);
1334 if (tc < 0)
1335 return -EINVAL;
1336 }
1337 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1338 if (!mask)
1339 return -ENOMEM;
1340
1341 rcu_read_lock();
1342 dev_maps = rcu_dereference(dev->xps_rxqs_map);
1343 if (!dev_maps)
1344 goto out_no_maps;
1345
1346 for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1347 j < dev->num_rx_queues;) {
1348 int i, tci = j * num_tc + tc;
1349 struct xps_map *map;
1350
1351 map = rcu_dereference(dev_maps->attr_map[tci]);
1352 if (!map)
1353 continue;
1354
1355 for (i = map->len; i--;) {
1356 if (map->queues[i] == index) {
1357 set_bit(j, mask);
1358 break;
1359 }
1360 }
1361 }
1362out_no_maps:
1363 rcu_read_unlock();
1364
1365 len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1366 bitmap_free(mask);
1367
1368 return len < PAGE_SIZE ? len : -EINVAL;
1369}
1370
1371static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1372 size_t len)
1373{
1374 struct net_device *dev = queue->dev;
1375 struct net *net = dev_net(dev);
1376 unsigned long *mask, index;
1377 int err;
1378
1379 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1380 return -EPERM;
1381
1382 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1383 if (!mask)
1384 return -ENOMEM;
1385
1386 index = get_netdev_queue_index(queue);
1387
1388 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1389 if (err) {
1390 bitmap_free(mask);
1391 return err;
1392 }
1393
1394 cpus_read_lock();
1395 err = __netif_set_xps_queue(dev, mask, index, true);
1396 cpus_read_unlock();
1397
1398 bitmap_free(mask);
1399 return err ? : len;
1400}
1401
1402static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1403 = __ATTR_RW(xps_rxqs);
1404#endif
1405
1406static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1407 &queue_trans_timeout.attr,
1408 &queue_traffic_class.attr,
1409#ifdef CONFIG_XPS
1410 &xps_cpus_attribute.attr,
1411 &xps_rxqs_attribute.attr,
1412 &queue_tx_maxrate.attr,
1413#endif
1414 NULL
1415};
1416ATTRIBUTE_GROUPS(netdev_queue_default);
1417
1418static void netdev_queue_release(struct kobject *kobj)
1419{
1420 struct netdev_queue *queue = to_netdev_queue(kobj);
1421
1422 memset(kobj, 0, sizeof(*kobj));
1423 dev_put(queue->dev);
1424}
1425
1426static const void *netdev_queue_namespace(struct kobject *kobj)
1427{
1428 struct netdev_queue *queue = to_netdev_queue(kobj);
1429 struct device *dev = &queue->dev->dev;
1430 const void *ns = NULL;
1431
1432 if (dev->class && dev->class->ns_type)
1433 ns = dev->class->namespace(dev);
1434
1435 return ns;
1436}
1437
1438static void netdev_queue_get_ownership(struct kobject *kobj,
1439 kuid_t *uid, kgid_t *gid)
1440{
1441 const struct net *net = netdev_queue_namespace(kobj);
1442
1443 net_ns_get_ownership(net, uid, gid);
1444}
1445
1446static struct kobj_type netdev_queue_ktype __ro_after_init = {
1447 .sysfs_ops = &netdev_queue_sysfs_ops,
1448 .release = netdev_queue_release,
1449 .default_groups = netdev_queue_default_groups,
1450 .namespace = netdev_queue_namespace,
1451 .get_ownership = netdev_queue_get_ownership,
1452};
1453
1454static int netdev_queue_add_kobject(struct net_device *dev, int index)
1455{
1456 struct netdev_queue *queue = dev->_tx + index;
1457 struct kobject *kobj = &queue->kobj;
1458 int error = 0;
1459
1460 kobj->kset = dev->queues_kset;
1461 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1462 "tx-%u", index);
1463 if (error)
1464 return error;
1465
1466 dev_hold(queue->dev);
1467
1468#ifdef CONFIG_BQL
1469 error = sysfs_create_group(kobj, &dql_group);
1470 if (error) {
1471 kobject_put(kobj);
1472 return error;
1473 }
1474#endif
1475
1476 kobject_uevent(kobj, KOBJ_ADD);
1477
1478 return 0;
1479}
1480#endif
1481
1482int
1483netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1484{
1485#ifdef CONFIG_SYSFS
1486 int i;
1487 int error = 0;
1488
1489 for (i = old_num; i < new_num; i++) {
1490 error = netdev_queue_add_kobject(dev, i);
1491 if (error) {
1492 new_num = old_num;
1493 break;
1494 }
1495 }
1496
1497 while (--i >= new_num) {
1498 struct netdev_queue *queue = dev->_tx + i;
1499
1500 if (!refcount_read(&dev_net(dev)->count))
1501 queue->kobj.uevent_suppress = 1;
1502#ifdef CONFIG_BQL
1503 sysfs_remove_group(&queue->kobj, &dql_group);
1504#endif
1505 kobject_put(&queue->kobj);
1506 }
1507
1508 return error;
1509#else
1510 return 0;
1511#endif
1512}
1513
1514static int register_queue_kobjects(struct net_device *dev)
1515{
1516 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1517
1518#ifdef CONFIG_SYSFS
1519 dev->queues_kset = kset_create_and_add("queues",
1520 NULL, &dev->dev.kobj);
1521 if (!dev->queues_kset)
1522 return -ENOMEM;
1523 real_rx = dev->real_num_rx_queues;
1524#endif
1525 real_tx = dev->real_num_tx_queues;
1526
1527 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1528 if (error)
1529 goto error;
1530 rxq = real_rx;
1531
1532 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1533 if (error)
1534 goto error;
1535 txq = real_tx;
1536
1537 return 0;
1538
1539error:
1540 netdev_queue_update_kobjects(dev, txq, 0);
1541 net_rx_queue_update_kobjects(dev, rxq, 0);
1542#ifdef CONFIG_SYSFS
1543 kset_unregister(dev->queues_kset);
1544#endif
1545 return error;
1546}
1547
1548static void remove_queue_kobjects(struct net_device *dev)
1549{
1550 int real_rx = 0, real_tx = 0;
1551
1552#ifdef CONFIG_SYSFS
1553 real_rx = dev->real_num_rx_queues;
1554#endif
1555 real_tx = dev->real_num_tx_queues;
1556
1557 net_rx_queue_update_kobjects(dev, real_rx, 0);
1558 netdev_queue_update_kobjects(dev, real_tx, 0);
1559#ifdef CONFIG_SYSFS
1560 kset_unregister(dev->queues_kset);
1561#endif
1562}
1563
1564static bool net_current_may_mount(void)
1565{
1566 struct net *net = current->nsproxy->net_ns;
1567
1568 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1569}
1570
1571static void *net_grab_current_ns(void)
1572{
1573 struct net *ns = current->nsproxy->net_ns;
1574#ifdef CONFIG_NET_NS
1575 if (ns)
1576 refcount_inc(&ns->passive);
1577#endif
1578 return ns;
1579}
1580
1581static const void *net_initial_ns(void)
1582{
1583 return &init_net;
1584}
1585
1586static const void *net_netlink_ns(struct sock *sk)
1587{
1588 return sock_net(sk);
1589}
1590
1591const struct kobj_ns_type_operations net_ns_type_operations = {
1592 .type = KOBJ_NS_TYPE_NET,
1593 .current_may_mount = net_current_may_mount,
1594 .grab_current_ns = net_grab_current_ns,
1595 .netlink_ns = net_netlink_ns,
1596 .initial_ns = net_initial_ns,
1597 .drop_ns = net_drop_ns,
1598};
1599EXPORT_SYMBOL_GPL(net_ns_type_operations);
1600
1601static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1602{
1603 struct net_device *dev = to_net_dev(d);
1604 int retval;
1605
1606
1607 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1608 if (retval)
1609 goto exit;
1610
1611
1612
1613
1614
1615 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1616
1617exit:
1618 return retval;
1619}
1620
1621
1622
1623
1624
1625static void netdev_release(struct device *d)
1626{
1627 struct net_device *dev = to_net_dev(d);
1628
1629 BUG_ON(dev->reg_state != NETREG_RELEASED);
1630
1631
1632
1633
1634 kfree(rcu_access_pointer(dev->ifalias));
1635 netdev_freemem(dev);
1636}
1637
1638static const void *net_namespace(struct device *d)
1639{
1640 struct net_device *dev = to_net_dev(d);
1641
1642 return dev_net(dev);
1643}
1644
1645static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1646{
1647 struct net_device *dev = to_net_dev(d);
1648 const struct net *net = dev_net(dev);
1649
1650 net_ns_get_ownership(net, uid, gid);
1651}
1652
1653static struct class net_class __ro_after_init = {
1654 .name = "net",
1655 .dev_release = netdev_release,
1656 .dev_groups = net_class_groups,
1657 .dev_uevent = netdev_uevent,
1658 .ns_type = &net_ns_type_operations,
1659 .namespace = net_namespace,
1660 .get_ownership = net_get_ownership,
1661};
1662
1663#ifdef CONFIG_OF_NET
1664static int of_dev_node_match(struct device *dev, const void *data)
1665{
1666 int ret = 0;
1667
1668 if (dev->parent)
1669 ret = dev->parent->of_node == data;
1670
1671 return ret == 0 ? dev->of_node == data : ret;
1672}
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683struct net_device *of_find_net_device_by_node(struct device_node *np)
1684{
1685 struct device *dev;
1686
1687 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1688 if (!dev)
1689 return NULL;
1690
1691 return to_net_dev(dev);
1692}
1693EXPORT_SYMBOL(of_find_net_device_by_node);
1694#endif
1695
1696
1697
1698
1699void netdev_unregister_kobject(struct net_device *ndev)
1700{
1701 struct device *dev = &ndev->dev;
1702
1703 if (!refcount_read(&dev_net(ndev)->count))
1704 dev_set_uevent_suppress(dev, 1);
1705
1706 kobject_get(&dev->kobj);
1707
1708 remove_queue_kobjects(ndev);
1709
1710 pm_runtime_set_memalloc_noio(dev, false);
1711
1712 device_del(dev);
1713}
1714
1715
1716int netdev_register_kobject(struct net_device *ndev)
1717{
1718 struct device *dev = &ndev->dev;
1719 const struct attribute_group **groups = ndev->sysfs_groups;
1720 int error = 0;
1721
1722 device_initialize(dev);
1723 dev->class = &net_class;
1724 dev->platform_data = ndev;
1725 dev->groups = groups;
1726
1727 dev_set_name(dev, "%s", ndev->name);
1728
1729#ifdef CONFIG_SYSFS
1730
1731 if (*groups)
1732 groups++;
1733
1734 *groups++ = &netstat_group;
1735
1736#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1737 if (ndev->ieee80211_ptr)
1738 *groups++ = &wireless_group;
1739#if IS_ENABLED(CONFIG_WIRELESS_EXT)
1740 else if (ndev->wireless_handlers)
1741 *groups++ = &wireless_group;
1742#endif
1743#endif
1744#endif
1745
1746 error = device_add(dev);
1747 if (error)
1748 return error;
1749
1750 error = register_queue_kobjects(ndev);
1751 if (error) {
1752 device_del(dev);
1753 return error;
1754 }
1755
1756 pm_runtime_set_memalloc_noio(dev, true);
1757
1758 return error;
1759}
1760
1761int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1762 const void *ns)
1763{
1764 return class_create_file_ns(&net_class, class_attr, ns);
1765}
1766EXPORT_SYMBOL(netdev_class_create_file_ns);
1767
1768void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1769 const void *ns)
1770{
1771 class_remove_file_ns(&net_class, class_attr, ns);
1772}
1773EXPORT_SYMBOL(netdev_class_remove_file_ns);
1774
1775int __init netdev_kobject_init(void)
1776{
1777 kobj_ns_type_register(&net_ns_type_operations);
1778 return class_register(&net_class);
1779}
1780
