1
2
3
4
5
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
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
923
924
925 dev_hold(queue->dev);
926
927 kobj->kset = dev->queues_kset;
928 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
929 "rx-%u", index);
930 if (error)
931 goto err;
932
933 if (dev->sysfs_rx_queue_group) {
934 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
935 if (error)
936 goto err;
937 }
938
939 kobject_uevent(kobj, KOBJ_ADD);
940
941 return error;
942
943err:
944 kobject_put(kobj);
945 return error;
946}
947#endif
948
949int
950net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
951{
952#ifdef CONFIG_SYSFS
953 int i;
954 int error = 0;
955
956#ifndef CONFIG_RPS
957 if (!dev->sysfs_rx_queue_group)
958 return 0;
959#endif
960 for (i = old_num; i < new_num; i++) {
961 error = rx_queue_add_kobject(dev, i);
962 if (error) {
963 new_num = old_num;
964 break;
965 }
966 }
967
968 while (--i >= new_num) {
969 struct kobject *kobj = &dev->_rx[i].kobj;
970
971 if (!refcount_read(&dev_net(dev)->count))
972 kobj->uevent_suppress = 1;
973 if (dev->sysfs_rx_queue_group)
974 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
975 kobject_put(kobj);
976 }
977
978 return error;
979#else
980 return 0;
981#endif
982}
983
984#ifdef CONFIG_SYSFS
985
986
987
988struct netdev_queue_attribute {
989 struct attribute attr;
990 ssize_t (*show)(struct netdev_queue *queue, char *buf);
991 ssize_t (*store)(struct netdev_queue *queue,
992 const char *buf, size_t len);
993};
994#define to_netdev_queue_attr(_attr) \
995 container_of(_attr, struct netdev_queue_attribute, attr)
996
997#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
998
999static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1000 struct attribute *attr, char *buf)
1001{
1002 const struct netdev_queue_attribute *attribute
1003 = to_netdev_queue_attr(attr);
1004 struct netdev_queue *queue = to_netdev_queue(kobj);
1005
1006 if (!attribute->show)
1007 return -EIO;
1008
1009 return attribute->show(queue, buf);
1010}
1011
1012static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1013 struct attribute *attr,
1014 const char *buf, size_t count)
1015{
1016 const struct netdev_queue_attribute *attribute
1017 = to_netdev_queue_attr(attr);
1018 struct netdev_queue *queue = to_netdev_queue(kobj);
1019
1020 if (!attribute->store)
1021 return -EIO;
1022
1023 return attribute->store(queue, buf, count);
1024}
1025
1026static const struct sysfs_ops netdev_queue_sysfs_ops = {
1027 .show = netdev_queue_attr_show,
1028 .store = netdev_queue_attr_store,
1029};
1030
1031static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1032{
1033 unsigned long trans_timeout;
1034
1035 spin_lock_irq(&queue->_xmit_lock);
1036 trans_timeout = queue->trans_timeout;
1037 spin_unlock_irq(&queue->_xmit_lock);
1038
1039 return sprintf(buf, "%lu", trans_timeout);
1040}
1041
1042static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1043{
1044 struct net_device *dev = queue->dev;
1045 unsigned int i;
1046
1047 i = queue - dev->_tx;
1048 BUG_ON(i >= dev->num_tx_queues);
1049
1050 return i;
1051}
1052
1053static ssize_t traffic_class_show(struct netdev_queue *queue,
1054 char *buf)
1055{
1056 struct net_device *dev = queue->dev;
1057 int index;
1058 int tc;
1059
1060 if (!netif_is_multiqueue(dev))
1061 return -ENOENT;
1062
1063 index = get_netdev_queue_index(queue);
1064
1065
1066 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1067
1068 tc = netdev_txq_to_tc(dev, index);
1069 if (tc < 0)
1070 return -EINVAL;
1071
1072
1073
1074
1075
1076
1077
1078
1079 return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1080 sprintf(buf, "%u\n", tc);
1081}
1082
1083#ifdef CONFIG_XPS
1084static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1085 char *buf)
1086{
1087 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1088}
1089
1090static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1091 const char *buf, size_t len)
1092{
1093 struct net_device *dev = queue->dev;
1094 int err, index = get_netdev_queue_index(queue);
1095 u32 rate = 0;
1096
1097 if (!capable(CAP_NET_ADMIN))
1098 return -EPERM;
1099
1100 err = kstrtou32(buf, 10, &rate);
1101 if (err < 0)
1102 return err;
1103
1104 if (!rtnl_trylock())
1105 return restart_syscall();
1106
1107 err = -EOPNOTSUPP;
1108 if (dev->netdev_ops->ndo_set_tx_maxrate)
1109 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1110
1111 rtnl_unlock();
1112 if (!err) {
1113 queue->tx_maxrate = rate;
1114 return len;
1115 }
1116 return err;
1117}
1118
1119static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1120 = __ATTR_RW(tx_maxrate);
1121#endif
1122
1123static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1124 = __ATTR_RO(tx_timeout);
1125
1126static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1127 = __ATTR_RO(traffic_class);
1128
1129#ifdef CONFIG_BQL
1130
1131
1132
1133static ssize_t bql_show(char *buf, unsigned int value)
1134{
1135 return sprintf(buf, "%u\n", value);
1136}
1137
1138static ssize_t bql_set(const char *buf, const size_t count,
1139 unsigned int *pvalue)
1140{
1141 unsigned int value;
1142 int err;
1143
1144 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1145 value = DQL_MAX_LIMIT;
1146 } else {
1147 err = kstrtouint(buf, 10, &value);
1148 if (err < 0)
1149 return err;
1150 if (value > DQL_MAX_LIMIT)
1151 return -EINVAL;
1152 }
1153
1154 *pvalue = value;
1155
1156 return count;
1157}
1158
1159static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1160 char *buf)
1161{
1162 struct dql *dql = &queue->dql;
1163
1164 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1165}
1166
1167static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1168 const char *buf, size_t len)
1169{
1170 struct dql *dql = &queue->dql;
1171 unsigned int value;
1172 int err;
1173
1174 err = kstrtouint(buf, 10, &value);
1175 if (err < 0)
1176 return err;
1177
1178 dql->slack_hold_time = msecs_to_jiffies(value);
1179
1180 return len;
1181}
1182
1183static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1184 = __ATTR(hold_time, 0644,
1185 bql_show_hold_time, bql_set_hold_time);
1186
1187static ssize_t bql_show_inflight(struct netdev_queue *queue,
1188 char *buf)
1189{
1190 struct dql *dql = &queue->dql;
1191
1192 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1193}
1194
1195static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1196 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1197
1198#define BQL_ATTR(NAME, FIELD) \
1199static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1200 char *buf) \
1201{ \
1202 return bql_show(buf, queue->dql.FIELD); \
1203} \
1204 \
1205static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1206 const char *buf, size_t len) \
1207{ \
1208 return bql_set(buf, len, &queue->dql.FIELD); \
1209} \
1210 \
1211static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1212 = __ATTR(NAME, 0644, \
1213 bql_show_ ## NAME, bql_set_ ## NAME)
1214
1215BQL_ATTR(limit, limit);
1216BQL_ATTR(limit_max, max_limit);
1217BQL_ATTR(limit_min, min_limit);
1218
1219static struct attribute *dql_attrs[] __ro_after_init = {
1220 &bql_limit_attribute.attr,
1221 &bql_limit_max_attribute.attr,
1222 &bql_limit_min_attribute.attr,
1223 &bql_hold_time_attribute.attr,
1224 &bql_inflight_attribute.attr,
1225 NULL
1226};
1227
1228static const struct attribute_group dql_group = {
1229 .name = "byte_queue_limits",
1230 .attrs = dql_attrs,
1231};
1232#endif
1233
1234#ifdef CONFIG_XPS
1235static ssize_t xps_cpus_show(struct netdev_queue *queue,
1236 char *buf)
1237{
1238 struct net_device *dev = queue->dev;
1239 int cpu, len, num_tc = 1, tc = 0;
1240 struct xps_dev_maps *dev_maps;
1241 cpumask_var_t mask;
1242 unsigned long index;
1243
1244 if (!netif_is_multiqueue(dev))
1245 return -ENOENT;
1246
1247 index = get_netdev_queue_index(queue);
1248
1249 if (dev->num_tc) {
1250
1251 num_tc = dev->num_tc;
1252 if (num_tc < 0)
1253 return -EINVAL;
1254
1255
1256 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1257
1258 tc = netdev_txq_to_tc(dev, index);
1259 if (tc < 0)
1260 return -EINVAL;
1261 }
1262
1263 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1264 return -ENOMEM;
1265
1266 rcu_read_lock();
1267 dev_maps = rcu_dereference(dev->xps_cpus_map);
1268 if (dev_maps) {
1269 for_each_possible_cpu(cpu) {
1270 int i, tci = cpu * num_tc + tc;
1271 struct xps_map *map;
1272
1273 map = rcu_dereference(dev_maps->attr_map[tci]);
1274 if (!map)
1275 continue;
1276
1277 for (i = map->len; i--;) {
1278 if (map->queues[i] == index) {
1279 cpumask_set_cpu(cpu, mask);
1280 break;
1281 }
1282 }
1283 }
1284 }
1285 rcu_read_unlock();
1286
1287 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1288 free_cpumask_var(mask);
1289 return len < PAGE_SIZE ? len : -EINVAL;
1290}
1291
1292static ssize_t xps_cpus_store(struct netdev_queue *queue,
1293 const char *buf, size_t len)
1294{
1295 struct net_device *dev = queue->dev;
1296 unsigned long index;
1297 cpumask_var_t mask;
1298 int err;
1299
1300 if (!netif_is_multiqueue(dev))
1301 return -ENOENT;
1302
1303 if (!capable(CAP_NET_ADMIN))
1304 return -EPERM;
1305
1306 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1307 return -ENOMEM;
1308
1309 index = get_netdev_queue_index(queue);
1310
1311 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1312 if (err) {
1313 free_cpumask_var(mask);
1314 return err;
1315 }
1316
1317 err = netif_set_xps_queue(dev, mask, index);
1318
1319 free_cpumask_var(mask);
1320
1321 return err ? : len;
1322}
1323
1324static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1325 = __ATTR_RW(xps_cpus);
1326
1327static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1328{
1329 struct net_device *dev = queue->dev;
1330 struct xps_dev_maps *dev_maps;
1331 unsigned long *mask, index;
1332 int j, len, num_tc = 1, tc = 0;
1333
1334 index = get_netdev_queue_index(queue);
1335
1336 if (dev->num_tc) {
1337 num_tc = dev->num_tc;
1338 tc = netdev_txq_to_tc(dev, index);
1339 if (tc < 0)
1340 return -EINVAL;
1341 }
1342 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1343 if (!mask)
1344 return -ENOMEM;
1345
1346 rcu_read_lock();
1347 dev_maps = rcu_dereference(dev->xps_rxqs_map);
1348 if (!dev_maps)
1349 goto out_no_maps;
1350
1351 for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1352 j < dev->num_rx_queues;) {
1353 int i, tci = j * num_tc + tc;
1354 struct xps_map *map;
1355
1356 map = rcu_dereference(dev_maps->attr_map[tci]);
1357 if (!map)
1358 continue;
1359
1360 for (i = map->len; i--;) {
1361 if (map->queues[i] == index) {
1362 set_bit(j, mask);
1363 break;
1364 }
1365 }
1366 }
1367out_no_maps:
1368 rcu_read_unlock();
1369
1370 len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1371 bitmap_free(mask);
1372
1373 return len < PAGE_SIZE ? len : -EINVAL;
1374}
1375
1376static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1377 size_t len)
1378{
1379 struct net_device *dev = queue->dev;
1380 struct net *net = dev_net(dev);
1381 unsigned long *mask, index;
1382 int err;
1383
1384 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1385 return -EPERM;
1386
1387 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1388 if (!mask)
1389 return -ENOMEM;
1390
1391 index = get_netdev_queue_index(queue);
1392
1393 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1394 if (err) {
1395 bitmap_free(mask);
1396 return err;
1397 }
1398
1399 cpus_read_lock();
1400 err = __netif_set_xps_queue(dev, mask, index, true);
1401 cpus_read_unlock();
1402
1403 bitmap_free(mask);
1404 return err ? : len;
1405}
1406
1407static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1408 = __ATTR_RW(xps_rxqs);
1409#endif
1410
1411static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1412 &queue_trans_timeout.attr,
1413 &queue_traffic_class.attr,
1414#ifdef CONFIG_XPS
1415 &xps_cpus_attribute.attr,
1416 &xps_rxqs_attribute.attr,
1417 &queue_tx_maxrate.attr,
1418#endif
1419 NULL
1420};
1421ATTRIBUTE_GROUPS(netdev_queue_default);
1422
1423static void netdev_queue_release(struct kobject *kobj)
1424{
1425 struct netdev_queue *queue = to_netdev_queue(kobj);
1426
1427 memset(kobj, 0, sizeof(*kobj));
1428 dev_put(queue->dev);
1429}
1430
1431static const void *netdev_queue_namespace(struct kobject *kobj)
1432{
1433 struct netdev_queue *queue = to_netdev_queue(kobj);
1434 struct device *dev = &queue->dev->dev;
1435 const void *ns = NULL;
1436
1437 if (dev->class && dev->class->ns_type)
1438 ns = dev->class->namespace(dev);
1439
1440 return ns;
1441}
1442
1443static void netdev_queue_get_ownership(struct kobject *kobj,
1444 kuid_t *uid, kgid_t *gid)
1445{
1446 const struct net *net = netdev_queue_namespace(kobj);
1447
1448 net_ns_get_ownership(net, uid, gid);
1449}
1450
1451static struct kobj_type netdev_queue_ktype __ro_after_init = {
1452 .sysfs_ops = &netdev_queue_sysfs_ops,
1453 .release = netdev_queue_release,
1454 .default_groups = netdev_queue_default_groups,
1455 .namespace = netdev_queue_namespace,
1456 .get_ownership = netdev_queue_get_ownership,
1457};
1458
1459static int netdev_queue_add_kobject(struct net_device *dev, int index)
1460{
1461 struct netdev_queue *queue = dev->_tx + index;
1462 struct kobject *kobj = &queue->kobj;
1463 int error = 0;
1464
1465
1466
1467
1468 dev_hold(queue->dev);
1469
1470 kobj->kset = dev->queues_kset;
1471 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1472 "tx-%u", index);
1473 if (error)
1474 goto err;
1475
1476#ifdef CONFIG_BQL
1477 error = sysfs_create_group(kobj, &dql_group);
1478 if (error)
1479 goto err;
1480#endif
1481
1482 kobject_uevent(kobj, KOBJ_ADD);
1483 return 0;
1484
1485err:
1486 kobject_put(kobj);
1487 return error;
1488}
1489#endif
1490
1491int
1492netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1493{
1494#ifdef CONFIG_SYSFS
1495 int i;
1496 int error = 0;
1497
1498 for (i = old_num; i < new_num; i++) {
1499 error = netdev_queue_add_kobject(dev, i);
1500 if (error) {
1501 new_num = old_num;
1502 break;
1503 }
1504 }
1505
1506 while (--i >= new_num) {
1507 struct netdev_queue *queue = dev->_tx + i;
1508
1509 if (!refcount_read(&dev_net(dev)->count))
1510 queue->kobj.uevent_suppress = 1;
1511#ifdef CONFIG_BQL
1512 sysfs_remove_group(&queue->kobj, &dql_group);
1513#endif
1514 kobject_put(&queue->kobj);
1515 }
1516
1517 return error;
1518#else
1519 return 0;
1520#endif
1521}
1522
1523static int register_queue_kobjects(struct net_device *dev)
1524{
1525 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1526
1527#ifdef CONFIG_SYSFS
1528 dev->queues_kset = kset_create_and_add("queues",
1529 NULL, &dev->dev.kobj);
1530 if (!dev->queues_kset)
1531 return -ENOMEM;
1532 real_rx = dev->real_num_rx_queues;
1533#endif
1534 real_tx = dev->real_num_tx_queues;
1535
1536 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1537 if (error)
1538 goto error;
1539 rxq = real_rx;
1540
1541 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1542 if (error)
1543 goto error;
1544 txq = real_tx;
1545
1546 return 0;
1547
1548error:
1549 netdev_queue_update_kobjects(dev, txq, 0);
1550 net_rx_queue_update_kobjects(dev, rxq, 0);
1551#ifdef CONFIG_SYSFS
1552 kset_unregister(dev->queues_kset);
1553#endif
1554 return error;
1555}
1556
1557static void remove_queue_kobjects(struct net_device *dev)
1558{
1559 int real_rx = 0, real_tx = 0;
1560
1561#ifdef CONFIG_SYSFS
1562 real_rx = dev->real_num_rx_queues;
1563#endif
1564 real_tx = dev->real_num_tx_queues;
1565
1566 net_rx_queue_update_kobjects(dev, real_rx, 0);
1567 netdev_queue_update_kobjects(dev, real_tx, 0);
1568#ifdef CONFIG_SYSFS
1569 kset_unregister(dev->queues_kset);
1570#endif
1571}
1572
1573static bool net_current_may_mount(void)
1574{
1575 struct net *net = current->nsproxy->net_ns;
1576
1577 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1578}
1579
1580static void *net_grab_current_ns(void)
1581{
1582 struct net *ns = current->nsproxy->net_ns;
1583#ifdef CONFIG_NET_NS
1584 if (ns)
1585 refcount_inc(&ns->passive);
1586#endif
1587 return ns;
1588}
1589
1590static const void *net_initial_ns(void)
1591{
1592 return &init_net;
1593}
1594
1595static const void *net_netlink_ns(struct sock *sk)
1596{
1597 return sock_net(sk);
1598}
1599
1600const struct kobj_ns_type_operations net_ns_type_operations = {
1601 .type = KOBJ_NS_TYPE_NET,
1602 .current_may_mount = net_current_may_mount,
1603 .grab_current_ns = net_grab_current_ns,
1604 .netlink_ns = net_netlink_ns,
1605 .initial_ns = net_initial_ns,
1606 .drop_ns = net_drop_ns,
1607};
1608EXPORT_SYMBOL_GPL(net_ns_type_operations);
1609
1610static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1611{
1612 struct net_device *dev = to_net_dev(d);
1613 int retval;
1614
1615
1616 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1617 if (retval)
1618 goto exit;
1619
1620
1621
1622
1623
1624 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1625
1626exit:
1627 return retval;
1628}
1629
1630
1631
1632
1633
1634static void netdev_release(struct device *d)
1635{
1636 struct net_device *dev = to_net_dev(d);
1637
1638 BUG_ON(dev->reg_state != NETREG_RELEASED);
1639
1640
1641
1642
1643 kfree(rcu_access_pointer(dev->ifalias));
1644 netdev_freemem(dev);
1645}
1646
1647static const void *net_namespace(struct device *d)
1648{
1649 struct net_device *dev = to_net_dev(d);
1650
1651 return dev_net(dev);
1652}
1653
1654static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1655{
1656 struct net_device *dev = to_net_dev(d);
1657 const struct net *net = dev_net(dev);
1658
1659 net_ns_get_ownership(net, uid, gid);
1660}
1661
1662static struct class net_class __ro_after_init = {
1663 .name = "net",
1664 .dev_release = netdev_release,
1665 .dev_groups = net_class_groups,
1666 .dev_uevent = netdev_uevent,
1667 .ns_type = &net_ns_type_operations,
1668 .namespace = net_namespace,
1669 .get_ownership = net_get_ownership,
1670};
1671
1672#ifdef CONFIG_OF_NET
1673static int of_dev_node_match(struct device *dev, const void *data)
1674{
1675 int ret = 0;
1676
1677 if (dev->parent)
1678 ret = dev->parent->of_node == data;
1679
1680 return ret == 0 ? dev->of_node == data : ret;
1681}
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692struct net_device *of_find_net_device_by_node(struct device_node *np)
1693{
1694 struct device *dev;
1695
1696 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1697 if (!dev)
1698 return NULL;
1699
1700 return to_net_dev(dev);
1701}
1702EXPORT_SYMBOL(of_find_net_device_by_node);
1703#endif
1704
1705
1706
1707
1708void netdev_unregister_kobject(struct net_device *ndev)
1709{
1710 struct device *dev = &ndev->dev;
1711
1712 if (!refcount_read(&dev_net(ndev)->count))
1713 dev_set_uevent_suppress(dev, 1);
1714
1715 kobject_get(&dev->kobj);
1716
1717 remove_queue_kobjects(ndev);
1718
1719 pm_runtime_set_memalloc_noio(dev, false);
1720
1721 device_del(dev);
1722}
1723
1724
1725int netdev_register_kobject(struct net_device *ndev)
1726{
1727 struct device *dev = &ndev->dev;
1728 const struct attribute_group **groups = ndev->sysfs_groups;
1729 int error = 0;
1730
1731 device_initialize(dev);
1732 dev->class = &net_class;
1733 dev->platform_data = ndev;
1734 dev->groups = groups;
1735
1736 dev_set_name(dev, "%s", ndev->name);
1737
1738#ifdef CONFIG_SYSFS
1739
1740 if (*groups)
1741 groups++;
1742
1743 *groups++ = &netstat_group;
1744
1745#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1746 if (ndev->ieee80211_ptr)
1747 *groups++ = &wireless_group;
1748#if IS_ENABLED(CONFIG_WIRELESS_EXT)
1749 else if (ndev->wireless_handlers)
1750 *groups++ = &wireless_group;
1751#endif
1752#endif
1753#endif
1754
1755 error = device_add(dev);
1756 if (error)
1757 return error;
1758
1759 error = register_queue_kobjects(ndev);
1760 if (error) {
1761 device_del(dev);
1762 return error;
1763 }
1764
1765 pm_runtime_set_memalloc_noio(dev, true);
1766
1767 return error;
1768}
1769
1770int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1771 const void *ns)
1772{
1773 return class_create_file_ns(&net_class, class_attr, ns);
1774}
1775EXPORT_SYMBOL(netdev_class_create_file_ns);
1776
1777void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1778 const void *ns)
1779{
1780 class_remove_file_ns(&net_class, class_attr, ns);
1781}
1782EXPORT_SYMBOL(netdev_class_remove_file_ns);
1783
1784int __init netdev_kobject_init(void)
1785{
1786 kobj_ns_type_register(&net_ns_type_operations);
1787 return class_register(&net_class);
1788}
1789
