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12#include <linux/capability.h>
13#include <linux/kernel.h>
14#include <linux/netdevice.h>
15#include <net/switchdev.h>
16#include <linux/if_arp.h>
17#include <linux/slab.h>
18#include <linux/sched/signal.h>
19#include <linux/nsproxy.h>
20#include <net/sock.h>
21#include <net/net_namespace.h>
22#include <linux/rtnetlink.h>
23#include <linux/vmalloc.h>
24#include <linux/export.h>
25#include <linux/jiffies.h>
26#include <linux/pm_runtime.h>
27#include <linux/of.h>
28#include <linux/of_net.h>
29#include <linux/cpu.h>
30
31#include "net-sysfs.h"
32
33#ifdef CONFIG_SYSFS
34static const char fmt_hex[] = "%#x\n";
35static const char fmt_dec[] = "%d\n";
36static const char fmt_ulong[] = "%lu\n";
37static const char fmt_u64[] = "%llu\n";
38
39static inline int dev_isalive(const struct net_device *dev)
40{
41 return dev->reg_state <= NETREG_REGISTERED;
42}
43
44
45static ssize_t netdev_show(const struct device *dev,
46 struct device_attribute *attr, char *buf,
47 ssize_t (*format)(const struct net_device *, char *))
48{
49 struct net_device *ndev = to_net_dev(dev);
50 ssize_t ret = -EINVAL;
51
52 read_lock(&dev_base_lock);
53 if (dev_isalive(ndev))
54 ret = (*format)(ndev, buf);
55 read_unlock(&dev_base_lock);
56
57 return ret;
58}
59
60
61#define NETDEVICE_SHOW(field, format_string) \
62static ssize_t format_##field(const struct net_device *dev, char *buf) \
63{ \
64 return sprintf(buf, format_string, dev->field); \
65} \
66static ssize_t field##_show(struct device *dev, \
67 struct device_attribute *attr, char *buf) \
68{ \
69 return netdev_show(dev, attr, buf, format_##field); \
70} \
71
72#define NETDEVICE_SHOW_RO(field, format_string) \
73NETDEVICE_SHOW(field, format_string); \
74static DEVICE_ATTR_RO(field)
75
76#define NETDEVICE_SHOW_RW(field, format_string) \
77NETDEVICE_SHOW(field, format_string); \
78static DEVICE_ATTR_RW(field)
79
80
81static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
82 const char *buf, size_t len,
83 int (*set)(struct net_device *, unsigned long))
84{
85 struct net_device *netdev = to_net_dev(dev);
86 struct net *net = dev_net(netdev);
87 unsigned long new;
88 int ret = -EINVAL;
89
90 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
91 return -EPERM;
92
93 ret = kstrtoul(buf, 0, &new);
94 if (ret)
95 goto err;
96
97 if (!rtnl_trylock())
98 return restart_syscall();
99
100 if (dev_isalive(netdev)) {
101 ret = (*set)(netdev, new);
102 if (ret == 0)
103 ret = len;
104 }
105 rtnl_unlock();
106 err:
107 return ret;
108}
109
110NETDEVICE_SHOW_RO(dev_id, fmt_hex);
111NETDEVICE_SHOW_RO(dev_port, fmt_dec);
112NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
113NETDEVICE_SHOW_RO(addr_len, fmt_dec);
114NETDEVICE_SHOW_RO(ifindex, fmt_dec);
115NETDEVICE_SHOW_RO(type, fmt_dec);
116NETDEVICE_SHOW_RO(link_mode, fmt_dec);
117
118static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
119 char *buf)
120{
121 struct net_device *ndev = to_net_dev(dev);
122
123 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
124}
125static DEVICE_ATTR_RO(iflink);
126
127static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
128{
129 return sprintf(buf, fmt_dec, dev->name_assign_type);
130}
131
132static ssize_t name_assign_type_show(struct device *dev,
133 struct device_attribute *attr,
134 char *buf)
135{
136 struct net_device *ndev = to_net_dev(dev);
137 ssize_t ret = -EINVAL;
138
139 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
140 ret = netdev_show(dev, attr, buf, format_name_assign_type);
141
142 return ret;
143}
144static DEVICE_ATTR_RO(name_assign_type);
145
146
147static ssize_t address_show(struct device *dev, struct device_attribute *attr,
148 char *buf)
149{
150 struct net_device *ndev = to_net_dev(dev);
151 ssize_t ret = -EINVAL;
152
153 read_lock(&dev_base_lock);
154 if (dev_isalive(ndev))
155 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
156 read_unlock(&dev_base_lock);
157 return ret;
158}
159static DEVICE_ATTR_RO(address);
160
161static ssize_t broadcast_show(struct device *dev,
162 struct device_attribute *attr, char *buf)
163{
164 struct net_device *ndev = to_net_dev(dev);
165
166 if (dev_isalive(ndev))
167 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
168 return -EINVAL;
169}
170static DEVICE_ATTR_RO(broadcast);
171
172static int change_carrier(struct net_device *dev, unsigned long new_carrier)
173{
174 if (!netif_running(dev))
175 return -EINVAL;
176 return dev_change_carrier(dev, (bool)new_carrier);
177}
178
179static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
180 const char *buf, size_t len)
181{
182 return netdev_store(dev, attr, buf, len, change_carrier);
183}
184
185static ssize_t carrier_show(struct device *dev,
186 struct device_attribute *attr, char *buf)
187{
188 struct net_device *netdev = to_net_dev(dev);
189
190 if (netif_running(netdev))
191 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
192
193 return -EINVAL;
194}
195static DEVICE_ATTR_RW(carrier);
196
197static ssize_t speed_show(struct device *dev,
198 struct device_attribute *attr, char *buf)
199{
200 struct net_device *netdev = to_net_dev(dev);
201 int ret = -EINVAL;
202
203 if (!rtnl_trylock())
204 return restart_syscall();
205
206 if (netif_running(netdev)) {
207 struct ethtool_link_ksettings cmd;
208
209 if (!__ethtool_get_link_ksettings(netdev, &cmd))
210 ret = sprintf(buf, fmt_dec, cmd.base.speed);
211 }
212 rtnl_unlock();
213 return ret;
214}
215static DEVICE_ATTR_RO(speed);
216
217static ssize_t duplex_show(struct device *dev,
218 struct device_attribute *attr, char *buf)
219{
220 struct net_device *netdev = to_net_dev(dev);
221 int ret = -EINVAL;
222
223 if (!rtnl_trylock())
224 return restart_syscall();
225
226 if (netif_running(netdev)) {
227 struct ethtool_link_ksettings cmd;
228
229 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
230 const char *duplex;
231
232 switch (cmd.base.duplex) {
233 case DUPLEX_HALF:
234 duplex = "half";
235 break;
236 case DUPLEX_FULL:
237 duplex = "full";
238 break;
239 default:
240 duplex = "unknown";
241 break;
242 }
243 ret = sprintf(buf, "%s\n", duplex);
244 }
245 }
246 rtnl_unlock();
247 return ret;
248}
249static DEVICE_ATTR_RO(duplex);
250
251static ssize_t dormant_show(struct device *dev,
252 struct device_attribute *attr, char *buf)
253{
254 struct net_device *netdev = to_net_dev(dev);
255
256 if (netif_running(netdev))
257 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
258
259 return -EINVAL;
260}
261static DEVICE_ATTR_RO(dormant);
262
263static const char *const operstates[] = {
264 "unknown",
265 "notpresent",
266 "down",
267 "lowerlayerdown",
268 "testing",
269 "dormant",
270 "up"
271};
272
273static ssize_t operstate_show(struct device *dev,
274 struct device_attribute *attr, char *buf)
275{
276 const struct net_device *netdev = to_net_dev(dev);
277 unsigned char operstate;
278
279 read_lock(&dev_base_lock);
280 operstate = netdev->operstate;
281 if (!netif_running(netdev))
282 operstate = IF_OPER_DOWN;
283 read_unlock(&dev_base_lock);
284
285 if (operstate >= ARRAY_SIZE(operstates))
286 return -EINVAL;
287
288 return sprintf(buf, "%s\n", operstates[operstate]);
289}
290static DEVICE_ATTR_RO(operstate);
291
292static ssize_t carrier_changes_show(struct device *dev,
293 struct device_attribute *attr,
294 char *buf)
295{
296 struct net_device *netdev = to_net_dev(dev);
297
298 return sprintf(buf, fmt_dec,
299 atomic_read(&netdev->carrier_up_count) +
300 atomic_read(&netdev->carrier_down_count));
301}
302static DEVICE_ATTR_RO(carrier_changes);
303
304static ssize_t carrier_up_count_show(struct device *dev,
305 struct device_attribute *attr,
306 char *buf)
307{
308 struct net_device *netdev = to_net_dev(dev);
309
310 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
311}
312static DEVICE_ATTR_RO(carrier_up_count);
313
314static ssize_t carrier_down_count_show(struct device *dev,
315 struct device_attribute *attr,
316 char *buf)
317{
318 struct net_device *netdev = to_net_dev(dev);
319
320 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
321}
322static DEVICE_ATTR_RO(carrier_down_count);
323
324
325
326static int change_mtu(struct net_device *dev, unsigned long new_mtu)
327{
328 return dev_set_mtu(dev, (int)new_mtu);
329}
330
331static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
332 const char *buf, size_t len)
333{
334 return netdev_store(dev, attr, buf, len, change_mtu);
335}
336NETDEVICE_SHOW_RW(mtu, fmt_dec);
337
338static int change_flags(struct net_device *dev, unsigned long new_flags)
339{
340 return dev_change_flags(dev, (unsigned int)new_flags);
341}
342
343static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
344 const char *buf, size_t len)
345{
346 return netdev_store(dev, attr, buf, len, change_flags);
347}
348NETDEVICE_SHOW_RW(flags, fmt_hex);
349
350static ssize_t tx_queue_len_store(struct device *dev,
351 struct device_attribute *attr,
352 const char *buf, size_t len)
353{
354 if (!capable(CAP_NET_ADMIN))
355 return -EPERM;
356
357 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
358}
359NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
360
361static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
362{
363 dev->gro_flush_timeout = val;
364 return 0;
365}
366
367static ssize_t gro_flush_timeout_store(struct device *dev,
368 struct device_attribute *attr,
369 const char *buf, size_t len)
370{
371 if (!capable(CAP_NET_ADMIN))
372 return -EPERM;
373
374 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
375}
376NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
377
378static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
379 const char *buf, size_t len)
380{
381 struct net_device *netdev = to_net_dev(dev);
382 struct net *net = dev_net(netdev);
383 size_t count = len;
384 ssize_t ret = 0;
385
386 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
387 return -EPERM;
388
389
390 if (len > 0 && buf[len - 1] == '\n')
391 --count;
392
393 if (!rtnl_trylock())
394 return restart_syscall();
395
396 if (dev_isalive(netdev)) {
397 ret = dev_set_alias(netdev, buf, count);
398 if (ret < 0)
399 goto err;
400 ret = len;
401 netdev_state_change(netdev);
402 }
403err:
404 rtnl_unlock();
405
406 return ret;
407}
408
409static ssize_t ifalias_show(struct device *dev,
410 struct device_attribute *attr, char *buf)
411{
412 const struct net_device *netdev = to_net_dev(dev);
413 char tmp[IFALIASZ];
414 ssize_t ret = 0;
415
416 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
417 if (ret > 0)
418 ret = sprintf(buf, "%s\n", tmp);
419 return ret;
420}
421static DEVICE_ATTR_RW(ifalias);
422
423static int change_group(struct net_device *dev, unsigned long new_group)
424{
425 dev_set_group(dev, (int)new_group);
426 return 0;
427}
428
429static ssize_t group_store(struct device *dev, struct device_attribute *attr,
430 const char *buf, size_t len)
431{
432 return netdev_store(dev, attr, buf, len, change_group);
433}
434NETDEVICE_SHOW(group, fmt_dec);
435static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
436
437static int change_proto_down(struct net_device *dev, unsigned long proto_down)
438{
439 return dev_change_proto_down(dev, (bool)proto_down);
440}
441
442static ssize_t proto_down_store(struct device *dev,
443 struct device_attribute *attr,
444 const char *buf, size_t len)
445{
446 return netdev_store(dev, attr, buf, len, change_proto_down);
447}
448NETDEVICE_SHOW_RW(proto_down, fmt_dec);
449
450static ssize_t phys_port_id_show(struct device *dev,
451 struct device_attribute *attr, char *buf)
452{
453 struct net_device *netdev = to_net_dev(dev);
454 ssize_t ret = -EINVAL;
455
456 if (!rtnl_trylock())
457 return restart_syscall();
458
459 if (dev_isalive(netdev)) {
460 struct netdev_phys_item_id ppid;
461
462 ret = dev_get_phys_port_id(netdev, &ppid);
463 if (!ret)
464 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
465 }
466 rtnl_unlock();
467
468 return ret;
469}
470static DEVICE_ATTR_RO(phys_port_id);
471
472static ssize_t phys_port_name_show(struct device *dev,
473 struct device_attribute *attr, char *buf)
474{
475 struct net_device *netdev = to_net_dev(dev);
476 ssize_t ret = -EINVAL;
477
478 if (!rtnl_trylock())
479 return restart_syscall();
480
481 if (dev_isalive(netdev)) {
482 char name[IFNAMSIZ];
483
484 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
485 if (!ret)
486 ret = sprintf(buf, "%s\n", name);
487 }
488 rtnl_unlock();
489
490 return ret;
491}
492static DEVICE_ATTR_RO(phys_port_name);
493
494static ssize_t phys_switch_id_show(struct device *dev,
495 struct device_attribute *attr, char *buf)
496{
497 struct net_device *netdev = to_net_dev(dev);
498 ssize_t ret = -EINVAL;
499
500 if (!rtnl_trylock())
501 return restart_syscall();
502
503 if (dev_isalive(netdev)) {
504 struct switchdev_attr attr = {
505 .orig_dev = netdev,
506 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
507 .flags = SWITCHDEV_F_NO_RECURSE,
508 };
509
510 ret = switchdev_port_attr_get(netdev, &attr);
511 if (!ret)
512 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
513 attr.u.ppid.id);
514 }
515 rtnl_unlock();
516
517 return ret;
518}
519static DEVICE_ATTR_RO(phys_switch_id);
520
521static struct attribute *net_class_attrs[] __ro_after_init = {
522 &dev_attr_netdev_group.attr,
523 &dev_attr_type.attr,
524 &dev_attr_dev_id.attr,
525 &dev_attr_dev_port.attr,
526 &dev_attr_iflink.attr,
527 &dev_attr_ifindex.attr,
528 &dev_attr_name_assign_type.attr,
529 &dev_attr_addr_assign_type.attr,
530 &dev_attr_addr_len.attr,
531 &dev_attr_link_mode.attr,
532 &dev_attr_address.attr,
533 &dev_attr_broadcast.attr,
534 &dev_attr_speed.attr,
535 &dev_attr_duplex.attr,
536 &dev_attr_dormant.attr,
537 &dev_attr_operstate.attr,
538 &dev_attr_carrier_changes.attr,
539 &dev_attr_ifalias.attr,
540 &dev_attr_carrier.attr,
541 &dev_attr_mtu.attr,
542 &dev_attr_flags.attr,
543 &dev_attr_tx_queue_len.attr,
544 &dev_attr_gro_flush_timeout.attr,
545 &dev_attr_phys_port_id.attr,
546 &dev_attr_phys_port_name.attr,
547 &dev_attr_phys_switch_id.attr,
548 &dev_attr_proto_down.attr,
549 &dev_attr_carrier_up_count.attr,
550 &dev_attr_carrier_down_count.attr,
551 NULL,
552};
553ATTRIBUTE_GROUPS(net_class);
554
555
556static ssize_t netstat_show(const struct device *d,
557 struct device_attribute *attr, char *buf,
558 unsigned long offset)
559{
560 struct net_device *dev = to_net_dev(d);
561 ssize_t ret = -EINVAL;
562
563 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
564 offset % sizeof(u64) != 0);
565
566 read_lock(&dev_base_lock);
567 if (dev_isalive(dev)) {
568 struct rtnl_link_stats64 temp;
569 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
570
571 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
572 }
573 read_unlock(&dev_base_lock);
574 return ret;
575}
576
577
578#define NETSTAT_ENTRY(name) \
579static ssize_t name##_show(struct device *d, \
580 struct device_attribute *attr, char *buf) \
581{ \
582 return netstat_show(d, attr, buf, \
583 offsetof(struct rtnl_link_stats64, name)); \
584} \
585static DEVICE_ATTR_RO(name)
586
587NETSTAT_ENTRY(rx_packets);
588NETSTAT_ENTRY(tx_packets);
589NETSTAT_ENTRY(rx_bytes);
590NETSTAT_ENTRY(tx_bytes);
591NETSTAT_ENTRY(rx_errors);
592NETSTAT_ENTRY(tx_errors);
593NETSTAT_ENTRY(rx_dropped);
594NETSTAT_ENTRY(tx_dropped);
595NETSTAT_ENTRY(multicast);
596NETSTAT_ENTRY(collisions);
597NETSTAT_ENTRY(rx_length_errors);
598NETSTAT_ENTRY(rx_over_errors);
599NETSTAT_ENTRY(rx_crc_errors);
600NETSTAT_ENTRY(rx_frame_errors);
601NETSTAT_ENTRY(rx_fifo_errors);
602NETSTAT_ENTRY(rx_missed_errors);
603NETSTAT_ENTRY(tx_aborted_errors);
604NETSTAT_ENTRY(tx_carrier_errors);
605NETSTAT_ENTRY(tx_fifo_errors);
606NETSTAT_ENTRY(tx_heartbeat_errors);
607NETSTAT_ENTRY(tx_window_errors);
608NETSTAT_ENTRY(rx_compressed);
609NETSTAT_ENTRY(tx_compressed);
610NETSTAT_ENTRY(rx_nohandler);
611
612static struct attribute *netstat_attrs[] __ro_after_init = {
613 &dev_attr_rx_packets.attr,
614 &dev_attr_tx_packets.attr,
615 &dev_attr_rx_bytes.attr,
616 &dev_attr_tx_bytes.attr,
617 &dev_attr_rx_errors.attr,
618 &dev_attr_tx_errors.attr,
619 &dev_attr_rx_dropped.attr,
620 &dev_attr_tx_dropped.attr,
621 &dev_attr_multicast.attr,
622 &dev_attr_collisions.attr,
623 &dev_attr_rx_length_errors.attr,
624 &dev_attr_rx_over_errors.attr,
625 &dev_attr_rx_crc_errors.attr,
626 &dev_attr_rx_frame_errors.attr,
627 &dev_attr_rx_fifo_errors.attr,
628 &dev_attr_rx_missed_errors.attr,
629 &dev_attr_tx_aborted_errors.attr,
630 &dev_attr_tx_carrier_errors.attr,
631 &dev_attr_tx_fifo_errors.attr,
632 &dev_attr_tx_heartbeat_errors.attr,
633 &dev_attr_tx_window_errors.attr,
634 &dev_attr_rx_compressed.attr,
635 &dev_attr_tx_compressed.attr,
636 &dev_attr_rx_nohandler.attr,
637 NULL
638};
639
640static const struct attribute_group netstat_group = {
641 .name = "statistics",
642 .attrs = netstat_attrs,
643};
644
645#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
646static struct attribute *wireless_attrs[] = {
647 NULL
648};
649
650static const struct attribute_group wireless_group = {
651 .name = "wireless",
652 .attrs = wireless_attrs,
653};
654#endif
655
656#else
657#define net_class_groups NULL
658#endif
659
660#ifdef CONFIG_SYSFS
661#define to_rx_queue_attr(_attr) \
662 container_of(_attr, struct rx_queue_attribute, attr)
663
664#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
665
666static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
667 char *buf)
668{
669 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
670 struct netdev_rx_queue *queue = to_rx_queue(kobj);
671
672 if (!attribute->show)
673 return -EIO;
674
675 return attribute->show(queue, buf);
676}
677
678static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
679 const char *buf, size_t count)
680{
681 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
682 struct netdev_rx_queue *queue = to_rx_queue(kobj);
683
684 if (!attribute->store)
685 return -EIO;
686
687 return attribute->store(queue, buf, count);
688}
689
690static const struct sysfs_ops rx_queue_sysfs_ops = {
691 .show = rx_queue_attr_show,
692 .store = rx_queue_attr_store,
693};
694
695#ifdef CONFIG_RPS
696static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
697{
698 struct rps_map *map;
699 cpumask_var_t mask;
700 int i, len;
701
702 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
703 return -ENOMEM;
704
705 rcu_read_lock();
706 map = rcu_dereference(queue->rps_map);
707 if (map)
708 for (i = 0; i < map->len; i++)
709 cpumask_set_cpu(map->cpus[i], mask);
710
711 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
712 rcu_read_unlock();
713 free_cpumask_var(mask);
714
715 return len < PAGE_SIZE ? len : -EINVAL;
716}
717
718static ssize_t store_rps_map(struct netdev_rx_queue *queue,
719 const char *buf, size_t len)
720{
721 struct rps_map *old_map, *map;
722 cpumask_var_t mask;
723 int err, cpu, i;
724 static DEFINE_MUTEX(rps_map_mutex);
725
726 if (!capable(CAP_NET_ADMIN))
727 return -EPERM;
728
729 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
730 return -ENOMEM;
731
732 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
733 if (err) {
734 free_cpumask_var(mask);
735 return err;
736 }
737
738 map = kzalloc(max_t(unsigned int,
739 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
740 GFP_KERNEL);
741 if (!map) {
742 free_cpumask_var(mask);
743 return -ENOMEM;
744 }
745
746 i = 0;
747 for_each_cpu_and(cpu, mask, cpu_online_mask)
748 map->cpus[i++] = cpu;
749
750 if (i) {
751 map->len = i;
752 } else {
753 kfree(map);
754 map = NULL;
755 }
756
757 mutex_lock(&rps_map_mutex);
758 old_map = rcu_dereference_protected(queue->rps_map,
759 mutex_is_locked(&rps_map_mutex));
760 rcu_assign_pointer(queue->rps_map, map);
761
762 if (map)
763 static_key_slow_inc(&rps_needed);
764 if (old_map)
765 static_key_slow_dec(&rps_needed);
766
767 mutex_unlock(&rps_map_mutex);
768
769 if (old_map)
770 kfree_rcu(old_map, rcu);
771
772 free_cpumask_var(mask);
773 return len;
774}
775
776static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
777 char *buf)
778{
779 struct rps_dev_flow_table *flow_table;
780 unsigned long val = 0;
781
782 rcu_read_lock();
783 flow_table = rcu_dereference(queue->rps_flow_table);
784 if (flow_table)
785 val = (unsigned long)flow_table->mask + 1;
786 rcu_read_unlock();
787
788 return sprintf(buf, "%lu\n", val);
789}
790
791static void rps_dev_flow_table_release(struct rcu_head *rcu)
792{
793 struct rps_dev_flow_table *table = container_of(rcu,
794 struct rps_dev_flow_table, rcu);
795 vfree(table);
796}
797
798static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
799 const char *buf, size_t len)
800{
801 unsigned long mask, count;
802 struct rps_dev_flow_table *table, *old_table;
803 static DEFINE_SPINLOCK(rps_dev_flow_lock);
804 int rc;
805
806 if (!capable(CAP_NET_ADMIN))
807 return -EPERM;
808
809 rc = kstrtoul(buf, 0, &count);
810 if (rc < 0)
811 return rc;
812
813 if (count) {
814 mask = count - 1;
815
816
817
818 while ((mask | (mask >> 1)) != mask)
819 mask |= (mask >> 1);
820
821
822
823
824#if BITS_PER_LONG > 32
825 if (mask > (unsigned long)(u32)mask)
826 return -EINVAL;
827#else
828 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
829 / sizeof(struct rps_dev_flow)) {
830
831 return -EINVAL;
832 }
833#endif
834 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
835 if (!table)
836 return -ENOMEM;
837
838 table->mask = mask;
839 for (count = 0; count <= mask; count++)
840 table->flows[count].cpu = RPS_NO_CPU;
841 } else {
842 table = NULL;
843 }
844
845 spin_lock(&rps_dev_flow_lock);
846 old_table = rcu_dereference_protected(queue->rps_flow_table,
847 lockdep_is_held(&rps_dev_flow_lock));
848 rcu_assign_pointer(queue->rps_flow_table, table);
849 spin_unlock(&rps_dev_flow_lock);
850
851 if (old_table)
852 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
853
854 return len;
855}
856
857static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
858 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
859
860static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
861 = __ATTR(rps_flow_cnt, 0644,
862 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
863#endif
864
865static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
866#ifdef CONFIG_RPS
867 &rps_cpus_attribute.attr,
868 &rps_dev_flow_table_cnt_attribute.attr,
869#endif
870 NULL
871};
872
873static void rx_queue_release(struct kobject *kobj)
874{
875 struct netdev_rx_queue *queue = to_rx_queue(kobj);
876#ifdef CONFIG_RPS
877 struct rps_map *map;
878 struct rps_dev_flow_table *flow_table;
879
880 map = rcu_dereference_protected(queue->rps_map, 1);
881 if (map) {
882 RCU_INIT_POINTER(queue->rps_map, NULL);
883 kfree_rcu(map, rcu);
884 }
885
886 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
887 if (flow_table) {
888 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
889 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
890 }
891#endif
892
893 memset(kobj, 0, sizeof(*kobj));
894 dev_put(queue->dev);
895}
896
897static const void *rx_queue_namespace(struct kobject *kobj)
898{
899 struct netdev_rx_queue *queue = to_rx_queue(kobj);
900 struct device *dev = &queue->dev->dev;
901 const void *ns = NULL;
902
903 if (dev->class && dev->class->ns_type)
904 ns = dev->class->namespace(dev);
905
906 return ns;
907}
908
909static void rx_queue_get_ownership(struct kobject *kobj,
910 kuid_t *uid, kgid_t *gid)
911{
912 const struct net *net = rx_queue_namespace(kobj);
913
914 net_ns_get_ownership(net, uid, gid);
915}
916
917static struct kobj_type rx_queue_ktype __ro_after_init = {
918 .sysfs_ops = &rx_queue_sysfs_ops,
919 .release = rx_queue_release,
920 .default_attrs = rx_queue_default_attrs,
921 .namespace = rx_queue_namespace,
922 .get_ownership = rx_queue_get_ownership,
923};
924
925static int rx_queue_add_kobject(struct net_device *dev, int index)
926{
927 struct netdev_rx_queue *queue = dev->_rx + index;
928 struct kobject *kobj = &queue->kobj;
929 int error = 0;
930
931 kobj->kset = dev->queues_kset;
932 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
933 "rx-%u", index);
934 if (error)
935 return error;
936
937 if (dev->sysfs_rx_queue_group) {
938 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
939 if (error) {
940 kobject_put(kobj);
941 return error;
942 }
943 }
944
945 kobject_uevent(kobj, KOBJ_ADD);
946 dev_hold(queue->dev);
947
948 return error;
949}
950#endif
951
952int
953net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
954{
955#ifdef CONFIG_SYSFS
956 int i;
957 int error = 0;
958
959#ifndef CONFIG_RPS
960 if (!dev->sysfs_rx_queue_group)
961 return 0;
962#endif
963 for (i = old_num; i < new_num; i++) {
964 error = rx_queue_add_kobject(dev, i);
965 if (error) {
966 new_num = old_num;
967 break;
968 }
969 }
970
971 while (--i >= new_num) {
972 struct kobject *kobj = &dev->_rx[i].kobj;
973
974 if (!refcount_read(&dev_net(dev)->count))
975 kobj->uevent_suppress = 1;
976 if (dev->sysfs_rx_queue_group)
977 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
978 kobject_put(kobj);
979 }
980
981 return error;
982#else
983 return 0;
984#endif
985}
986
987#ifdef CONFIG_SYSFS
988
989
990
991struct netdev_queue_attribute {
992 struct attribute attr;
993 ssize_t (*show)(struct netdev_queue *queue, char *buf);
994 ssize_t (*store)(struct netdev_queue *queue,
995 const char *buf, size_t len);
996};
997#define to_netdev_queue_attr(_attr) \
998 container_of(_attr, struct netdev_queue_attribute, attr)
999
1000#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1001
1002static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1003 struct attribute *attr, char *buf)
1004{
1005 const struct netdev_queue_attribute *attribute
1006 = to_netdev_queue_attr(attr);
1007 struct netdev_queue *queue = to_netdev_queue(kobj);
1008
1009 if (!attribute->show)
1010 return -EIO;
1011
1012 return attribute->show(queue, buf);
1013}
1014
1015static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1016 struct attribute *attr,
1017 const char *buf, size_t count)
1018{
1019 const struct netdev_queue_attribute *attribute
1020 = to_netdev_queue_attr(attr);
1021 struct netdev_queue *queue = to_netdev_queue(kobj);
1022
1023 if (!attribute->store)
1024 return -EIO;
1025
1026 return attribute->store(queue, buf, count);
1027}
1028
1029static const struct sysfs_ops netdev_queue_sysfs_ops = {
1030 .show = netdev_queue_attr_show,
1031 .store = netdev_queue_attr_store,
1032};
1033
1034static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1035{
1036 unsigned long trans_timeout;
1037
1038 spin_lock_irq(&queue->_xmit_lock);
1039 trans_timeout = queue->trans_timeout;
1040 spin_unlock_irq(&queue->_xmit_lock);
1041
1042 return sprintf(buf, "%lu", trans_timeout);
1043}
1044
1045static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1046{
1047 struct net_device *dev = queue->dev;
1048 unsigned int i;
1049
1050 i = queue - dev->_tx;
1051 BUG_ON(i >= dev->num_tx_queues);
1052
1053 return i;
1054}
1055
1056static ssize_t traffic_class_show(struct netdev_queue *queue,
1057 char *buf)
1058{
1059 struct net_device *dev = queue->dev;
1060 int index;
1061 int tc;
1062
1063 if (!netif_is_multiqueue(dev))
1064 return -ENOENT;
1065
1066 index = get_netdev_queue_index(queue);
1067
1068
1069 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1070
1071 tc = netdev_txq_to_tc(dev, index);
1072 if (tc < 0)
1073 return -EINVAL;
1074
1075
1076
1077
1078
1079
1080
1081
1082 return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1083 sprintf(buf, "%u\n", tc);
1084}
1085
1086#ifdef CONFIG_XPS
1087static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1088 char *buf)
1089{
1090 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1091}
1092
1093static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1094 const char *buf, size_t len)
1095{
1096 struct net_device *dev = queue->dev;
1097 int err, index = get_netdev_queue_index(queue);
1098 u32 rate = 0;
1099
1100 if (!capable(CAP_NET_ADMIN))
1101 return -EPERM;
1102
1103 err = kstrtou32(buf, 10, &rate);
1104 if (err < 0)
1105 return err;
1106
1107 if (!rtnl_trylock())
1108 return restart_syscall();
1109
1110 err = -EOPNOTSUPP;
1111 if (dev->netdev_ops->ndo_set_tx_maxrate)
1112 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1113
1114 rtnl_unlock();
1115 if (!err) {
1116 queue->tx_maxrate = rate;
1117 return len;
1118 }
1119 return err;
1120}
1121
1122static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1123 = __ATTR_RW(tx_maxrate);
1124#endif
1125
1126static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1127 = __ATTR_RO(tx_timeout);
1128
1129static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1130 = __ATTR_RO(traffic_class);
1131
1132#ifdef CONFIG_BQL
1133
1134
1135
1136static ssize_t bql_show(char *buf, unsigned int value)
1137{
1138 return sprintf(buf, "%u\n", value);
1139}
1140
1141static ssize_t bql_set(const char *buf, const size_t count,
1142 unsigned int *pvalue)
1143{
1144 unsigned int value;
1145 int err;
1146
1147 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1148 value = DQL_MAX_LIMIT;
1149 } else {
1150 err = kstrtouint(buf, 10, &value);
1151 if (err < 0)
1152 return err;
1153 if (value > DQL_MAX_LIMIT)
1154 return -EINVAL;
1155 }
1156
1157 *pvalue = value;
1158
1159 return count;
1160}
1161
1162static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1163 char *buf)
1164{
1165 struct dql *dql = &queue->dql;
1166
1167 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1168}
1169
1170static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1171 const char *buf, size_t len)
1172{
1173 struct dql *dql = &queue->dql;
1174 unsigned int value;
1175 int err;
1176
1177 err = kstrtouint(buf, 10, &value);
1178 if (err < 0)
1179 return err;
1180
1181 dql->slack_hold_time = msecs_to_jiffies(value);
1182
1183 return len;
1184}
1185
1186static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1187 = __ATTR(hold_time, 0644,
1188 bql_show_hold_time, bql_set_hold_time);
1189
1190static ssize_t bql_show_inflight(struct netdev_queue *queue,
1191 char *buf)
1192{
1193 struct dql *dql = &queue->dql;
1194
1195 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1196}
1197
1198static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1199 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1200
1201#define BQL_ATTR(NAME, FIELD) \
1202static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1203 char *buf) \
1204{ \
1205 return bql_show(buf, queue->dql.FIELD); \
1206} \
1207 \
1208static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1209 const char *buf, size_t len) \
1210{ \
1211 return bql_set(buf, len, &queue->dql.FIELD); \
1212} \
1213 \
1214static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1215 = __ATTR(NAME, 0644, \
1216 bql_show_ ## NAME, bql_set_ ## NAME)
1217
1218BQL_ATTR(limit, limit);
1219BQL_ATTR(limit_max, max_limit);
1220BQL_ATTR(limit_min, min_limit);
1221
1222static struct attribute *dql_attrs[] __ro_after_init = {
1223 &bql_limit_attribute.attr,
1224 &bql_limit_max_attribute.attr,
1225 &bql_limit_min_attribute.attr,
1226 &bql_hold_time_attribute.attr,
1227 &bql_inflight_attribute.attr,
1228 NULL
1229};
1230
1231static const struct attribute_group dql_group = {
1232 .name = "byte_queue_limits",
1233 .attrs = dql_attrs,
1234};
1235#endif
1236
1237#ifdef CONFIG_XPS
1238static ssize_t xps_cpus_show(struct netdev_queue *queue,
1239 char *buf)
1240{
1241 struct net_device *dev = queue->dev;
1242 int cpu, len, num_tc = 1, tc = 0;
1243 struct xps_dev_maps *dev_maps;
1244 cpumask_var_t mask;
1245 unsigned long index;
1246
1247 if (!netif_is_multiqueue(dev))
1248 return -ENOENT;
1249
1250 index = get_netdev_queue_index(queue);
1251
1252 if (dev->num_tc) {
1253
1254 num_tc = dev->num_tc;
1255 if (num_tc < 0)
1256 return -EINVAL;
1257
1258
1259 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1260
1261 tc = netdev_txq_to_tc(dev, index);
1262 if (tc < 0)
1263 return -EINVAL;
1264 }
1265
1266 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1267 return -ENOMEM;
1268
1269 rcu_read_lock();
1270 dev_maps = rcu_dereference(dev->xps_cpus_map);
1271 if (dev_maps) {
1272 for_each_possible_cpu(cpu) {
1273 int i, tci = cpu * num_tc + tc;
1274 struct xps_map *map;
1275
1276 map = rcu_dereference(dev_maps->attr_map[tci]);
1277 if (!map)
1278 continue;
1279
1280 for (i = map->len; i--;) {
1281 if (map->queues[i] == index) {
1282 cpumask_set_cpu(cpu, mask);
1283 break;
1284 }
1285 }
1286 }
1287 }
1288 rcu_read_unlock();
1289
1290 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1291 free_cpumask_var(mask);
1292 return len < PAGE_SIZE ? len : -EINVAL;
1293}
1294
1295static ssize_t xps_cpus_store(struct netdev_queue *queue,
1296 const char *buf, size_t len)
1297{
1298 struct net_device *dev = queue->dev;
1299 unsigned long index;
1300 cpumask_var_t mask;
1301 int err;
1302
1303 if (!netif_is_multiqueue(dev))
1304 return -ENOENT;
1305
1306 if (!capable(CAP_NET_ADMIN))
1307 return -EPERM;
1308
1309 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1310 return -ENOMEM;
1311
1312 index = get_netdev_queue_index(queue);
1313
1314 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1315 if (err) {
1316 free_cpumask_var(mask);
1317 return err;
1318 }
1319
1320 err = netif_set_xps_queue(dev, mask, index);
1321
1322 free_cpumask_var(mask);
1323
1324 return err ? : len;
1325}
1326
1327static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1328 = __ATTR_RW(xps_cpus);
1329
1330static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1331{
1332 struct net_device *dev = queue->dev;
1333 struct xps_dev_maps *dev_maps;
1334 unsigned long *mask, index;
1335 int j, len, num_tc = 1, tc = 0;
1336
1337 index = get_netdev_queue_index(queue);
1338
1339 if (dev->num_tc) {
1340 num_tc = dev->num_tc;
1341 tc = netdev_txq_to_tc(dev, index);
1342 if (tc < 0)
1343 return -EINVAL;
1344 }
1345 mask = kcalloc(BITS_TO_LONGS(dev->num_rx_queues), sizeof(long),
1346 GFP_KERNEL);
1347 if (!mask)
1348 return -ENOMEM;
1349
1350 rcu_read_lock();
1351 dev_maps = rcu_dereference(dev->xps_rxqs_map);
1352 if (!dev_maps)
1353 goto out_no_maps;
1354
1355 for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1356 j < dev->num_rx_queues;) {
1357 int i, tci = j * num_tc + tc;
1358 struct xps_map *map;
1359
1360 map = rcu_dereference(dev_maps->attr_map[tci]);
1361 if (!map)
1362 continue;
1363
1364 for (i = map->len; i--;) {
1365 if (map->queues[i] == index) {
1366 set_bit(j, mask);
1367 break;
1368 }
1369 }
1370 }
1371out_no_maps:
1372 rcu_read_unlock();
1373
1374 len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1375 kfree(mask);
1376
1377 return len < PAGE_SIZE ? len : -EINVAL;
1378}
1379
1380static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1381 size_t len)
1382{
1383 struct net_device *dev = queue->dev;
1384 struct net *net = dev_net(dev);
1385 unsigned long *mask, index;
1386 int err;
1387
1388 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1389 return -EPERM;
1390
1391 mask = kcalloc(BITS_TO_LONGS(dev->num_rx_queues), sizeof(long),
1392 GFP_KERNEL);
1393 if (!mask)
1394 return -ENOMEM;
1395
1396 index = get_netdev_queue_index(queue);
1397
1398 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1399 if (err) {
1400 kfree(mask);
1401 return err;
1402 }
1403
1404 cpus_read_lock();
1405 err = __netif_set_xps_queue(dev, mask, index, true);
1406 cpus_read_unlock();
1407
1408 kfree(mask);
1409 return err ? : len;
1410}
1411
1412static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1413 = __ATTR_RW(xps_rxqs);
1414#endif
1415
1416static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1417 &queue_trans_timeout.attr,
1418 &queue_traffic_class.attr,
1419#ifdef CONFIG_XPS
1420 &xps_cpus_attribute.attr,
1421 &xps_rxqs_attribute.attr,
1422 &queue_tx_maxrate.attr,
1423#endif
1424 NULL
1425};
1426
1427static void netdev_queue_release(struct kobject *kobj)
1428{
1429 struct netdev_queue *queue = to_netdev_queue(kobj);
1430
1431 memset(kobj, 0, sizeof(*kobj));
1432 dev_put(queue->dev);
1433}
1434
1435static const void *netdev_queue_namespace(struct kobject *kobj)
1436{
1437 struct netdev_queue *queue = to_netdev_queue(kobj);
1438 struct device *dev = &queue->dev->dev;
1439 const void *ns = NULL;
1440
1441 if (dev->class && dev->class->ns_type)
1442 ns = dev->class->namespace(dev);
1443
1444 return ns;
1445}
1446
1447static void netdev_queue_get_ownership(struct kobject *kobj,
1448 kuid_t *uid, kgid_t *gid)
1449{
1450 const struct net *net = netdev_queue_namespace(kobj);
1451
1452 net_ns_get_ownership(net, uid, gid);
1453}
1454
1455static struct kobj_type netdev_queue_ktype __ro_after_init = {
1456 .sysfs_ops = &netdev_queue_sysfs_ops,
1457 .release = netdev_queue_release,
1458 .default_attrs = netdev_queue_default_attrs,
1459 .namespace = netdev_queue_namespace,
1460 .get_ownership = netdev_queue_get_ownership,
1461};
1462
1463static int netdev_queue_add_kobject(struct net_device *dev, int index)
1464{
1465 struct netdev_queue *queue = dev->_tx + index;
1466 struct kobject *kobj = &queue->kobj;
1467 int error = 0;
1468
1469 kobj->kset = dev->queues_kset;
1470 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1471 "tx-%u", index);
1472 if (error)
1473 return error;
1474
1475#ifdef CONFIG_BQL
1476 error = sysfs_create_group(kobj, &dql_group);
1477 if (error) {
1478 kobject_put(kobj);
1479 return error;
1480 }
1481#endif
1482
1483 kobject_uevent(kobj, KOBJ_ADD);
1484 dev_hold(queue->dev);
1485
1486 return 0;
1487}
1488#endif
1489
1490int
1491netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1492{
1493#ifdef CONFIG_SYSFS
1494 int i;
1495 int error = 0;
1496
1497 for (i = old_num; i < new_num; i++) {
1498 error = netdev_queue_add_kobject(dev, i);
1499 if (error) {
1500 new_num = old_num;
1501 break;
1502 }
1503 }
1504
1505 while (--i >= new_num) {
1506 struct netdev_queue *queue = dev->_tx + i;
1507
1508 if (!refcount_read(&dev_net(dev)->count))
1509 queue->kobj.uevent_suppress = 1;
1510#ifdef CONFIG_BQL
1511 sysfs_remove_group(&queue->kobj, &dql_group);
1512#endif
1513 kobject_put(&queue->kobj);
1514 }
1515
1516 return error;
1517#else
1518 return 0;
1519#endif
1520}
1521
1522static int register_queue_kobjects(struct net_device *dev)
1523{
1524 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1525
1526#ifdef CONFIG_SYSFS
1527 dev->queues_kset = kset_create_and_add("queues",
1528 NULL, &dev->dev.kobj);
1529 if (!dev->queues_kset)
1530 return -ENOMEM;
1531 real_rx = dev->real_num_rx_queues;
1532#endif
1533 real_tx = dev->real_num_tx_queues;
1534
1535 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1536 if (error)
1537 goto error;
1538 rxq = real_rx;
1539
1540 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1541 if (error)
1542 goto error;
1543 txq = real_tx;
1544
1545 return 0;
1546
1547error:
1548 netdev_queue_update_kobjects(dev, txq, 0);
1549 net_rx_queue_update_kobjects(dev, rxq, 0);
1550 return error;
1551}
1552
1553static void remove_queue_kobjects(struct net_device *dev)
1554{
1555 int real_rx = 0, real_tx = 0;
1556
1557#ifdef CONFIG_SYSFS
1558 real_rx = dev->real_num_rx_queues;
1559#endif
1560 real_tx = dev->real_num_tx_queues;
1561
1562 net_rx_queue_update_kobjects(dev, real_rx, 0);
1563 netdev_queue_update_kobjects(dev, real_tx, 0);
1564#ifdef CONFIG_SYSFS
1565 kset_unregister(dev->queues_kset);
1566#endif
1567}
1568
1569static bool net_current_may_mount(void)
1570{
1571 struct net *net = current->nsproxy->net_ns;
1572
1573 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1574}
1575
1576static void *net_grab_current_ns(void)
1577{
1578 struct net *ns = current->nsproxy->net_ns;
1579#ifdef CONFIG_NET_NS
1580 if (ns)
1581 refcount_inc(&ns->passive);
1582#endif
1583 return ns;
1584}
1585
1586static const void *net_initial_ns(void)
1587{
1588 return &init_net;
1589}
1590
1591static const void *net_netlink_ns(struct sock *sk)
1592{
1593 return sock_net(sk);
1594}
1595
1596const struct kobj_ns_type_operations net_ns_type_operations = {
1597 .type = KOBJ_NS_TYPE_NET,
1598 .current_may_mount = net_current_may_mount,
1599 .grab_current_ns = net_grab_current_ns,
1600 .netlink_ns = net_netlink_ns,
1601 .initial_ns = net_initial_ns,
1602 .drop_ns = net_drop_ns,
1603};
1604EXPORT_SYMBOL_GPL(net_ns_type_operations);
1605
1606static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1607{
1608 struct net_device *dev = to_net_dev(d);
1609 int retval;
1610
1611
1612 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1613 if (retval)
1614 goto exit;
1615
1616
1617
1618
1619
1620 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1621
1622exit:
1623 return retval;
1624}
1625
1626
1627
1628
1629
1630static void netdev_release(struct device *d)
1631{
1632 struct net_device *dev = to_net_dev(d);
1633
1634 BUG_ON(dev->reg_state != NETREG_RELEASED);
1635
1636
1637
1638
1639 kfree(rcu_access_pointer(dev->ifalias));
1640 netdev_freemem(dev);
1641}
1642
1643static const void *net_namespace(struct device *d)
1644{
1645 struct net_device *dev = to_net_dev(d);
1646
1647 return dev_net(dev);
1648}
1649
1650static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1651{
1652 struct net_device *dev = to_net_dev(d);
1653 const struct net *net = dev_net(dev);
1654
1655 net_ns_get_ownership(net, uid, gid);
1656}
1657
1658static struct class net_class __ro_after_init = {
1659 .name = "net",
1660 .dev_release = netdev_release,
1661 .dev_groups = net_class_groups,
1662 .dev_uevent = netdev_uevent,
1663 .ns_type = &net_ns_type_operations,
1664 .namespace = net_namespace,
1665 .get_ownership = net_get_ownership,
1666};
1667
1668#ifdef CONFIG_OF_NET
1669static int of_dev_node_match(struct device *dev, const void *data)
1670{
1671 int ret = 0;
1672
1673 if (dev->parent)
1674 ret = dev->parent->of_node == data;
1675
1676 return ret == 0 ? dev->of_node == data : ret;
1677}
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688struct net_device *of_find_net_device_by_node(struct device_node *np)
1689{
1690 struct device *dev;
1691
1692 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1693 if (!dev)
1694 return NULL;
1695
1696 return to_net_dev(dev);
1697}
1698EXPORT_SYMBOL(of_find_net_device_by_node);
1699#endif
1700
1701
1702
1703
1704void netdev_unregister_kobject(struct net_device *ndev)
1705{
1706 struct device *dev = &ndev->dev;
1707
1708 if (!refcount_read(&dev_net(ndev)->count))
1709 dev_set_uevent_suppress(dev, 1);
1710
1711 kobject_get(&dev->kobj);
1712
1713 remove_queue_kobjects(ndev);
1714
1715 pm_runtime_set_memalloc_noio(dev, false);
1716
1717 device_del(dev);
1718}
1719
1720
1721int netdev_register_kobject(struct net_device *ndev)
1722{
1723 struct device *dev = &ndev->dev;
1724 const struct attribute_group **groups = ndev->sysfs_groups;
1725 int error = 0;
1726
1727 device_initialize(dev);
1728 dev->class = &net_class;
1729 dev->platform_data = ndev;
1730 dev->groups = groups;
1731
1732 dev_set_name(dev, "%s", ndev->name);
1733
1734#ifdef CONFIG_SYSFS
1735
1736 if (*groups)
1737 groups++;
1738
1739 *groups++ = &netstat_group;
1740
1741#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1742 if (ndev->ieee80211_ptr)
1743 *groups++ = &wireless_group;
1744#if IS_ENABLED(CONFIG_WIRELESS_EXT)
1745 else if (ndev->wireless_handlers)
1746 *groups++ = &wireless_group;
1747#endif
1748#endif
1749#endif
1750
1751 error = device_add(dev);
1752 if (error)
1753 return error;
1754
1755 error = register_queue_kobjects(ndev);
1756 if (error) {
1757 device_del(dev);
1758 return error;
1759 }
1760
1761 pm_runtime_set_memalloc_noio(dev, true);
1762
1763 return error;
1764}
1765
1766int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1767 const void *ns)
1768{
1769 return class_create_file_ns(&net_class, class_attr, ns);
1770}
1771EXPORT_SYMBOL(netdev_class_create_file_ns);
1772
1773void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1774 const void *ns)
1775{
1776 class_remove_file_ns(&net_class, class_attr, ns);
1777}
1778EXPORT_SYMBOL(netdev_class_remove_file_ns);
1779
1780int __init netdev_kobject_init(void)
1781{
1782 kobj_ns_type_register(&net_ns_type_operations);
1783 return class_register(&net_class);
1784}
1785
