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1/*
2 * net-sysfs.c - network device class and attributes
3 *
4 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
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/nsproxy.h>
19#include <net/sock.h>
20#include <net/net_namespace.h>
21#include <linux/rtnetlink.h>
22#include <linux/vmalloc.h>
23#include <linux/export.h>
24#include <linux/jiffies.h>
25#include <linux/pm_runtime.h>
26#include <linux/of.h>
27
28#include "net-sysfs.h"
29
30#ifdef CONFIG_SYSFS
31static const char fmt_hex[] = "%#x\n";
32static const char fmt_dec[] = "%d\n";
33static const char fmt_ulong[] = "%lu\n";
34static const char fmt_u64[] = "%llu\n";
35
36static inline int dev_isalive(const struct net_device *dev)
37{
38 return dev->reg_state <= NETREG_REGISTERED;
39}
40
41/* use same locking rules as GIF* ioctl's */
42static ssize_t netdev_show(const struct device *dev,
43 struct device_attribute *attr, char *buf,
44 ssize_t (*format)(const struct net_device *, char *))
45{
46 struct net_device *ndev = to_net_dev(dev);
47 ssize_t ret = -EINVAL;
48
49 read_lock(&dev_base_lock);
50 if (dev_isalive(ndev))
51 ret = (*format)(ndev, buf);
52 read_unlock(&dev_base_lock);
53
54 return ret;
55}
56
57/* generate a show function for simple field */
58#define NETDEVICE_SHOW(field, format_string) \
59static ssize_t format_##field(const struct net_device *dev, char *buf) \
60{ \
61 return sprintf(buf, format_string, dev->field); \
62} \
63static ssize_t field##_show(struct device *dev, \
64 struct device_attribute *attr, char *buf) \
65{ \
66 return netdev_show(dev, attr, buf, format_##field); \
67} \
68
69#define NETDEVICE_SHOW_RO(field, format_string) \
70NETDEVICE_SHOW(field, format_string); \
71static DEVICE_ATTR_RO(field)
72
73#define NETDEVICE_SHOW_RW(field, format_string) \
74NETDEVICE_SHOW(field, format_string); \
75static DEVICE_ATTR_RW(field)
76
77/* use same locking and permission rules as SIF* ioctl's */
78static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
79 const char *buf, size_t len,
80 int (*set)(struct net_device *, unsigned long))
81{
82 struct net_device *netdev = to_net_dev(dev);
83 struct net *net = dev_net(netdev);
84 unsigned long new;
85 int ret = -EINVAL;
86
87 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
88 return -EPERM;
89
90 ret = kstrtoul(buf, 0, &new);
91 if (ret)
92 goto err;
93
94 if (!rtnl_trylock())
95 return restart_syscall();
96
97 if (dev_isalive(netdev)) {
98 if ((ret = (*set)(netdev, new)) == 0)
99 ret = len;
100 }
101 rtnl_unlock();
102 err:
103 return ret;
104}
105
106NETDEVICE_SHOW_RO(dev_id, fmt_hex);
107NETDEVICE_SHOW_RO(dev_port, fmt_dec);
108NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
109NETDEVICE_SHOW_RO(addr_len, fmt_dec);
110NETDEVICE_SHOW_RO(ifindex, fmt_dec);
111NETDEVICE_SHOW_RO(type, fmt_dec);
112NETDEVICE_SHOW_RO(link_mode, fmt_dec);
113
114static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
115 char *buf)
116{
117 struct net_device *ndev = to_net_dev(dev);
118
119 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
120}
121static DEVICE_ATTR_RO(iflink);
122
123static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
124{
125 return sprintf(buf, fmt_dec, dev->name_assign_type);
126}
127
128static ssize_t name_assign_type_show(struct device *dev,
129 struct device_attribute *attr,
130 char *buf)
131{
132 struct net_device *ndev = to_net_dev(dev);
133 ssize_t ret = -EINVAL;
134
135 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
136 ret = netdev_show(dev, attr, buf, format_name_assign_type);
137
138 return ret;
139}
140static DEVICE_ATTR_RO(name_assign_type);
141
142/* use same locking rules as GIFHWADDR ioctl's */
143static ssize_t address_show(struct device *dev, struct device_attribute *attr,
144 char *buf)
145{
146 struct net_device *ndev = to_net_dev(dev);
147 ssize_t ret = -EINVAL;
148
149 read_lock(&dev_base_lock);
150 if (dev_isalive(ndev))
151 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
152 read_unlock(&dev_base_lock);
153 return ret;
154}
155static DEVICE_ATTR_RO(address);
156
157static ssize_t broadcast_show(struct device *dev,
158 struct device_attribute *attr, char *buf)
159{
160 struct net_device *ndev = to_net_dev(dev);
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 if (netif_running(netdev)) {
185 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
186 }
187 return -EINVAL;
188}
189static DEVICE_ATTR_RW(carrier);
190
191static ssize_t speed_show(struct device *dev,
192 struct device_attribute *attr, char *buf)
193{
194 struct net_device *netdev = to_net_dev(dev);
195 int ret = -EINVAL;
196
197 if (!rtnl_trylock())
198 return restart_syscall();
199
200 if (netif_running(netdev)) {
201 struct ethtool_link_ksettings cmd;
202
203 if (!__ethtool_get_link_ksettings(netdev, &cmd))
204 ret = sprintf(buf, fmt_dec, cmd.base.speed);
205 }
206 rtnl_unlock();
207 return ret;
208}
209static DEVICE_ATTR_RO(speed);
210
211static ssize_t duplex_show(struct device *dev,
212 struct device_attribute *attr, char *buf)
213{
214 struct net_device *netdev = to_net_dev(dev);
215 int ret = -EINVAL;
216
217 if (!rtnl_trylock())
218 return restart_syscall();
219
220 if (netif_running(netdev)) {
221 struct ethtool_link_ksettings cmd;
222
223 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
224 const char *duplex;
225
226 switch (cmd.base.duplex) {
227 case DUPLEX_HALF:
228 duplex = "half";
229 break;
230 case DUPLEX_FULL:
231 duplex = "full";
232 break;
233 default:
234 duplex = "unknown";
235 break;
236 }
237 ret = sprintf(buf, "%s\n", duplex);
238 }
239 }
240 rtnl_unlock();
241 return ret;
242}
243static DEVICE_ATTR_RO(duplex);
244
245static ssize_t dormant_show(struct device *dev,
246 struct device_attribute *attr, char *buf)
247{
248 struct net_device *netdev = to_net_dev(dev);
249
250 if (netif_running(netdev))
251 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
252
253 return -EINVAL;
254}
255static DEVICE_ATTR_RO(dormant);
256
257static const char *const operstates[] = {
258 "unknown",
259 "notpresent", /* currently unused */
260 "down",
261 "lowerlayerdown",
262 "testing", /* currently unused */
263 "dormant",
264 "up"
265};
266
267static ssize_t operstate_show(struct device *dev,
268 struct device_attribute *attr, char *buf)
269{
270 const struct net_device *netdev = to_net_dev(dev);
271 unsigned char operstate;
272
273 read_lock(&dev_base_lock);
274 operstate = netdev->operstate;
275 if (!netif_running(netdev))
276 operstate = IF_OPER_DOWN;
277 read_unlock(&dev_base_lock);
278
279 if (operstate >= ARRAY_SIZE(operstates))
280 return -EINVAL; /* should not happen */
281
282 return sprintf(buf, "%s\n", operstates[operstate]);
283}
284static DEVICE_ATTR_RO(operstate);
285
286static ssize_t carrier_changes_show(struct device *dev,
287 struct device_attribute *attr,
288 char *buf)
289{
290 struct net_device *netdev = to_net_dev(dev);
291 return sprintf(buf, fmt_dec,
292 atomic_read(&netdev->carrier_changes));
293}
294static DEVICE_ATTR_RO(carrier_changes);
295
296/* read-write attributes */
297
298static int change_mtu(struct net_device *dev, unsigned long new_mtu)
299{
300 return dev_set_mtu(dev, (int) new_mtu);
301}
302
303static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
304 const char *buf, size_t len)
305{
306 return netdev_store(dev, attr, buf, len, change_mtu);
307}
308NETDEVICE_SHOW_RW(mtu, fmt_dec);
309
310static int change_flags(struct net_device *dev, unsigned long new_flags)
311{
312 return dev_change_flags(dev, (unsigned int) new_flags);
313}
314
315static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
316 const char *buf, size_t len)
317{
318 return netdev_store(dev, attr, buf, len, change_flags);
319}
320NETDEVICE_SHOW_RW(flags, fmt_hex);
321
322static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
323{
324 dev->tx_queue_len = new_len;
325 return 0;
326}
327
328static ssize_t tx_queue_len_store(struct device *dev,
329 struct device_attribute *attr,
330 const char *buf, size_t len)
331{
332 if (!capable(CAP_NET_ADMIN))
333 return -EPERM;
334
335 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
336}
337NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
338
339static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
340{
341 dev->gro_flush_timeout = val;
342 return 0;
343}
344
345static ssize_t gro_flush_timeout_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, change_gro_flush_timeout);
353}
354NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
355
356static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
357 const char *buf, size_t len)
358{
359 struct net_device *netdev = to_net_dev(dev);
360 struct net *net = dev_net(netdev);
361 size_t count = len;
362 ssize_t ret;
363
364 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
365 return -EPERM;
366
367 /* ignore trailing newline */
368 if (len > 0 && buf[len - 1] == '\n')
369 --count;
370
371 if (!rtnl_trylock())
372 return restart_syscall();
373 ret = dev_set_alias(netdev, buf, count);
374 rtnl_unlock();
375
376 return ret < 0 ? ret : len;
377}
378
379static ssize_t ifalias_show(struct device *dev,
380 struct device_attribute *attr, char *buf)
381{
382 const struct net_device *netdev = to_net_dev(dev);
383 ssize_t ret = 0;
384
385 if (!rtnl_trylock())
386 return restart_syscall();
387 if (netdev->ifalias)
388 ret = sprintf(buf, "%s\n", netdev->ifalias);
389 rtnl_unlock();
390 return ret;
391}
392static DEVICE_ATTR_RW(ifalias);
393
394static int change_group(struct net_device *dev, unsigned long new_group)
395{
396 dev_set_group(dev, (int) new_group);
397 return 0;
398}
399
400static ssize_t group_store(struct device *dev, struct device_attribute *attr,
401 const char *buf, size_t len)
402{
403 return netdev_store(dev, attr, buf, len, change_group);
404}
405NETDEVICE_SHOW(group, fmt_dec);
406static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
407
408static int change_proto_down(struct net_device *dev, unsigned long proto_down)
409{
410 return dev_change_proto_down(dev, (bool) proto_down);
411}
412
413static ssize_t proto_down_store(struct device *dev,
414 struct device_attribute *attr,
415 const char *buf, size_t len)
416{
417 return netdev_store(dev, attr, buf, len, change_proto_down);
418}
419NETDEVICE_SHOW_RW(proto_down, fmt_dec);
420
421static ssize_t phys_port_id_show(struct device *dev,
422 struct device_attribute *attr, char *buf)
423{
424 struct net_device *netdev = to_net_dev(dev);
425 ssize_t ret = -EINVAL;
426
427 if (!rtnl_trylock())
428 return restart_syscall();
429
430 if (dev_isalive(netdev)) {
431 struct netdev_phys_item_id ppid;
432
433 ret = dev_get_phys_port_id(netdev, &ppid);
434 if (!ret)
435 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
436 }
437 rtnl_unlock();
438
439 return ret;
440}
441static DEVICE_ATTR_RO(phys_port_id);
442
443static ssize_t phys_port_name_show(struct device *dev,
444 struct device_attribute *attr, char *buf)
445{
446 struct net_device *netdev = to_net_dev(dev);
447 ssize_t ret = -EINVAL;
448
449 if (!rtnl_trylock())
450 return restart_syscall();
451
452 if (dev_isalive(netdev)) {
453 char name[IFNAMSIZ];
454
455 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
456 if (!ret)
457 ret = sprintf(buf, "%s\n", name);
458 }
459 rtnl_unlock();
460
461 return ret;
462}
463static DEVICE_ATTR_RO(phys_port_name);
464
465static ssize_t phys_switch_id_show(struct device *dev,
466 struct device_attribute *attr, char *buf)
467{
468 struct net_device *netdev = to_net_dev(dev);
469 ssize_t ret = -EINVAL;
470
471 if (!rtnl_trylock())
472 return restart_syscall();
473
474 if (dev_isalive(netdev)) {
475 struct switchdev_attr attr = {
476 .orig_dev = netdev,
477 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
478 .flags = SWITCHDEV_F_NO_RECURSE,
479 };
480
481 ret = switchdev_port_attr_get(netdev, &attr);
482 if (!ret)
483 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
484 attr.u.ppid.id);
485 }
486 rtnl_unlock();
487
488 return ret;
489}
490static DEVICE_ATTR_RO(phys_switch_id);
491
492static struct attribute *net_class_attrs[] = {
493 &dev_attr_netdev_group.attr,
494 &dev_attr_type.attr,
495 &dev_attr_dev_id.attr,
496 &dev_attr_dev_port.attr,
497 &dev_attr_iflink.attr,
498 &dev_attr_ifindex.attr,
499 &dev_attr_name_assign_type.attr,
500 &dev_attr_addr_assign_type.attr,
501 &dev_attr_addr_len.attr,
502 &dev_attr_link_mode.attr,
503 &dev_attr_address.attr,
504 &dev_attr_broadcast.attr,
505 &dev_attr_speed.attr,
506 &dev_attr_duplex.attr,
507 &dev_attr_dormant.attr,
508 &dev_attr_operstate.attr,
509 &dev_attr_carrier_changes.attr,
510 &dev_attr_ifalias.attr,
511 &dev_attr_carrier.attr,
512 &dev_attr_mtu.attr,
513 &dev_attr_flags.attr,
514 &dev_attr_tx_queue_len.attr,
515 &dev_attr_gro_flush_timeout.attr,
516 &dev_attr_phys_port_id.attr,
517 &dev_attr_phys_port_name.attr,
518 &dev_attr_phys_switch_id.attr,
519 &dev_attr_proto_down.attr,
520 NULL,
521};
522ATTRIBUTE_GROUPS(net_class);
523
524/* Show a given an attribute in the statistics group */
525static ssize_t netstat_show(const struct device *d,
526 struct device_attribute *attr, char *buf,
527 unsigned long offset)
528{
529 struct net_device *dev = to_net_dev(d);
530 ssize_t ret = -EINVAL;
531
532 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
533 offset % sizeof(u64) != 0);
534
535 read_lock(&dev_base_lock);
536 if (dev_isalive(dev)) {
537 struct rtnl_link_stats64 temp;
538 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
539
540 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
541 }
542 read_unlock(&dev_base_lock);
543 return ret;
544}
545
546/* generate a read-only statistics attribute */
547#define NETSTAT_ENTRY(name) \
548static ssize_t name##_show(struct device *d, \
549 struct device_attribute *attr, char *buf) \
550{ \
551 return netstat_show(d, attr, buf, \
552 offsetof(struct rtnl_link_stats64, name)); \
553} \
554static DEVICE_ATTR_RO(name)
555
556NETSTAT_ENTRY(rx_packets);
557NETSTAT_ENTRY(tx_packets);
558NETSTAT_ENTRY(rx_bytes);
559NETSTAT_ENTRY(tx_bytes);
560NETSTAT_ENTRY(rx_errors);
561NETSTAT_ENTRY(tx_errors);
562NETSTAT_ENTRY(rx_dropped);
563NETSTAT_ENTRY(tx_dropped);
564NETSTAT_ENTRY(multicast);
565NETSTAT_ENTRY(collisions);
566NETSTAT_ENTRY(rx_length_errors);
567NETSTAT_ENTRY(rx_over_errors);
568NETSTAT_ENTRY(rx_crc_errors);
569NETSTAT_ENTRY(rx_frame_errors);
570NETSTAT_ENTRY(rx_fifo_errors);
571NETSTAT_ENTRY(rx_missed_errors);
572NETSTAT_ENTRY(tx_aborted_errors);
573NETSTAT_ENTRY(tx_carrier_errors);
574NETSTAT_ENTRY(tx_fifo_errors);
575NETSTAT_ENTRY(tx_heartbeat_errors);
576NETSTAT_ENTRY(tx_window_errors);
577NETSTAT_ENTRY(rx_compressed);
578NETSTAT_ENTRY(tx_compressed);
579NETSTAT_ENTRY(rx_nohandler);
580
581static struct attribute *netstat_attrs[] = {
582 &dev_attr_rx_packets.attr,
583 &dev_attr_tx_packets.attr,
584 &dev_attr_rx_bytes.attr,
585 &dev_attr_tx_bytes.attr,
586 &dev_attr_rx_errors.attr,
587 &dev_attr_tx_errors.attr,
588 &dev_attr_rx_dropped.attr,
589 &dev_attr_tx_dropped.attr,
590 &dev_attr_multicast.attr,
591 &dev_attr_collisions.attr,
592 &dev_attr_rx_length_errors.attr,
593 &dev_attr_rx_over_errors.attr,
594 &dev_attr_rx_crc_errors.attr,
595 &dev_attr_rx_frame_errors.attr,
596 &dev_attr_rx_fifo_errors.attr,
597 &dev_attr_rx_missed_errors.attr,
598 &dev_attr_tx_aborted_errors.attr,
599 &dev_attr_tx_carrier_errors.attr,
600 &dev_attr_tx_fifo_errors.attr,
601 &dev_attr_tx_heartbeat_errors.attr,
602 &dev_attr_tx_window_errors.attr,
603 &dev_attr_rx_compressed.attr,
604 &dev_attr_tx_compressed.attr,
605 &dev_attr_rx_nohandler.attr,
606 NULL
607};
608
609
610static struct attribute_group netstat_group = {
611 .name = "statistics",
612 .attrs = netstat_attrs,
613};
614
615#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
616static struct attribute *wireless_attrs[] = {
617 NULL
618};
619
620static struct attribute_group wireless_group = {
621 .name = "wireless",
622 .attrs = wireless_attrs,
623};
624#endif
625
626#else /* CONFIG_SYSFS */
627#define net_class_groups NULL
628#endif /* CONFIG_SYSFS */
629
630#ifdef CONFIG_SYSFS
631#define to_rx_queue_attr(_attr) container_of(_attr, \
632 struct rx_queue_attribute, attr)
633
634#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
635
636static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
637 char *buf)
638{
639 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
640 struct netdev_rx_queue *queue = to_rx_queue(kobj);
641
642 if (!attribute->show)
643 return -EIO;
644
645 return attribute->show(queue, attribute, buf);
646}
647
648static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
649 const char *buf, size_t count)
650{
651 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
652 struct netdev_rx_queue *queue = to_rx_queue(kobj);
653
654 if (!attribute->store)
655 return -EIO;
656
657 return attribute->store(queue, attribute, buf, count);
658}
659
660static const struct sysfs_ops rx_queue_sysfs_ops = {
661 .show = rx_queue_attr_show,
662 .store = rx_queue_attr_store,
663};
664
665#ifdef CONFIG_RPS
666static ssize_t show_rps_map(struct netdev_rx_queue *queue,
667 struct rx_queue_attribute *attribute, char *buf)
668{
669 struct rps_map *map;
670 cpumask_var_t mask;
671 int i, len;
672
673 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
674 return -ENOMEM;
675
676 rcu_read_lock();
677 map = rcu_dereference(queue->rps_map);
678 if (map)
679 for (i = 0; i < map->len; i++)
680 cpumask_set_cpu(map->cpus[i], mask);
681
682 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
683 rcu_read_unlock();
684 free_cpumask_var(mask);
685
686 return len < PAGE_SIZE ? len : -EINVAL;
687}
688
689static ssize_t store_rps_map(struct netdev_rx_queue *queue,
690 struct rx_queue_attribute *attribute,
691 const char *buf, size_t len)
692{
693 struct rps_map *old_map, *map;
694 cpumask_var_t mask;
695 int err, cpu, i;
696 static DEFINE_MUTEX(rps_map_mutex);
697
698 if (!capable(CAP_NET_ADMIN))
699 return -EPERM;
700
701 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
702 return -ENOMEM;
703
704 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
705 if (err) {
706 free_cpumask_var(mask);
707 return err;
708 }
709
710 map = kzalloc(max_t(unsigned int,
711 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
712 GFP_KERNEL);
713 if (!map) {
714 free_cpumask_var(mask);
715 return -ENOMEM;
716 }
717
718 i = 0;
719 for_each_cpu_and(cpu, mask, cpu_online_mask)
720 map->cpus[i++] = cpu;
721
722 if (i)
723 map->len = i;
724 else {
725 kfree(map);
726 map = NULL;
727 }
728
729 mutex_lock(&rps_map_mutex);
730 old_map = rcu_dereference_protected(queue->rps_map,
731 mutex_is_locked(&rps_map_mutex));
732 rcu_assign_pointer(queue->rps_map, map);
733
734 if (map)
735 static_key_slow_inc(&rps_needed);
736 if (old_map)
737 static_key_slow_dec(&rps_needed);
738
739 mutex_unlock(&rps_map_mutex);
740
741 if (old_map)
742 kfree_rcu(old_map, rcu);
743
744 free_cpumask_var(mask);
745 return len;
746}
747
748static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
749 struct rx_queue_attribute *attr,
750 char *buf)
751{
752 struct rps_dev_flow_table *flow_table;
753 unsigned long val = 0;
754
755 rcu_read_lock();
756 flow_table = rcu_dereference(queue->rps_flow_table);
757 if (flow_table)
758 val = (unsigned long)flow_table->mask + 1;
759 rcu_read_unlock();
760
761 return sprintf(buf, "%lu\n", val);
762}
763
764static void rps_dev_flow_table_release(struct rcu_head *rcu)
765{
766 struct rps_dev_flow_table *table = container_of(rcu,
767 struct rps_dev_flow_table, rcu);
768 vfree(table);
769}
770
771static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
772 struct rx_queue_attribute *attr,
773 const char *buf, size_t len)
774{
775 unsigned long mask, count;
776 struct rps_dev_flow_table *table, *old_table;
777 static DEFINE_SPINLOCK(rps_dev_flow_lock);
778 int rc;
779
780 if (!capable(CAP_NET_ADMIN))
781 return -EPERM;
782
783 rc = kstrtoul(buf, 0, &count);
784 if (rc < 0)
785 return rc;
786
787 if (count) {
788 mask = count - 1;
789 /* mask = roundup_pow_of_two(count) - 1;
790 * without overflows...
791 */
792 while ((mask | (mask >> 1)) != mask)
793 mask |= (mask >> 1);
794 /* On 64 bit arches, must check mask fits in table->mask (u32),
795 * and on 32bit arches, must check
796 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
797 */
798#if BITS_PER_LONG > 32
799 if (mask > (unsigned long)(u32)mask)
800 return -EINVAL;
801#else
802 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
803 / sizeof(struct rps_dev_flow)) {
804 /* Enforce a limit to prevent overflow */
805 return -EINVAL;
806 }
807#endif
808 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
809 if (!table)
810 return -ENOMEM;
811
812 table->mask = mask;
813 for (count = 0; count <= mask; count++)
814 table->flows[count].cpu = RPS_NO_CPU;
815 } else
816 table = NULL;
817
818 spin_lock(&rps_dev_flow_lock);
819 old_table = rcu_dereference_protected(queue->rps_flow_table,
820 lockdep_is_held(&rps_dev_flow_lock));
821 rcu_assign_pointer(queue->rps_flow_table, table);
822 spin_unlock(&rps_dev_flow_lock);
823
824 if (old_table)
825 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
826
827 return len;
828}
829
830static struct rx_queue_attribute rps_cpus_attribute =
831 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
832
833
834static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
835 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
836 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
837#endif /* CONFIG_RPS */
838
839static struct attribute *rx_queue_default_attrs[] = {
840#ifdef CONFIG_RPS
841 &rps_cpus_attribute.attr,
842 &rps_dev_flow_table_cnt_attribute.attr,
843#endif
844 NULL
845};
846
847static void rx_queue_release(struct kobject *kobj)
848{
849 struct netdev_rx_queue *queue = to_rx_queue(kobj);
850#ifdef CONFIG_RPS
851 struct rps_map *map;
852 struct rps_dev_flow_table *flow_table;
853
854
855 map = rcu_dereference_protected(queue->rps_map, 1);
856 if (map) {
857 RCU_INIT_POINTER(queue->rps_map, NULL);
858 kfree_rcu(map, rcu);
859 }
860
861 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
862 if (flow_table) {
863 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
864 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
865 }
866#endif
867
868 memset(kobj, 0, sizeof(*kobj));
869 dev_put(queue->dev);
870}
871
872static const void *rx_queue_namespace(struct kobject *kobj)
873{
874 struct netdev_rx_queue *queue = to_rx_queue(kobj);
875 struct device *dev = &queue->dev->dev;
876 const void *ns = NULL;
877
878 if (dev->class && dev->class->ns_type)
879 ns = dev->class->namespace(dev);
880
881 return ns;
882}
883
884static struct kobj_type rx_queue_ktype = {
885 .sysfs_ops = &rx_queue_sysfs_ops,
886 .release = rx_queue_release,
887 .default_attrs = rx_queue_default_attrs,
888 .namespace = rx_queue_namespace
889};
890
891static int rx_queue_add_kobject(struct net_device *dev, int index)
892{
893 struct netdev_rx_queue *queue = dev->_rx + index;
894 struct kobject *kobj = &queue->kobj;
895 int error = 0;
896
897 kobj->kset = dev->queues_kset;
898 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
899 "rx-%u", index);
900 if (error)
901 goto exit;
902
903 if (dev->sysfs_rx_queue_group) {
904 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
905 if (error)
906 goto exit;
907 }
908
909 kobject_uevent(kobj, KOBJ_ADD);
910 dev_hold(queue->dev);
911
912 return error;
913exit:
914 kobject_put(kobj);
915 return error;
916}
917#endif /* CONFIG_SYSFS */
918
919int
920net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
921{
922#ifdef CONFIG_SYSFS
923 int i;
924 int error = 0;
925
926#ifndef CONFIG_RPS
927 if (!dev->sysfs_rx_queue_group)
928 return 0;
929#endif
930 for (i = old_num; i < new_num; i++) {
931 error = rx_queue_add_kobject(dev, i);
932 if (error) {
933 new_num = old_num;
934 break;
935 }
936 }
937
938 while (--i >= new_num) {
939 if (dev->sysfs_rx_queue_group)
940 sysfs_remove_group(&dev->_rx[i].kobj,
941 dev->sysfs_rx_queue_group);
942 kobject_put(&dev->_rx[i].kobj);
943 }
944
945 return error;
946#else
947 return 0;
948#endif
949}
950
951#ifdef CONFIG_SYSFS
952/*
953 * netdev_queue sysfs structures and functions.
954 */
955struct netdev_queue_attribute {
956 struct attribute attr;
957 ssize_t (*show)(struct netdev_queue *queue,
958 struct netdev_queue_attribute *attr, char *buf);
959 ssize_t (*store)(struct netdev_queue *queue,
960 struct netdev_queue_attribute *attr, const char *buf, size_t len);
961};
962#define to_netdev_queue_attr(_attr) container_of(_attr, \
963 struct netdev_queue_attribute, attr)
964
965#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
966
967static ssize_t netdev_queue_attr_show(struct kobject *kobj,
968 struct attribute *attr, char *buf)
969{
970 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
971 struct netdev_queue *queue = to_netdev_queue(kobj);
972
973 if (!attribute->show)
974 return -EIO;
975
976 return attribute->show(queue, attribute, buf);
977}
978
979static ssize_t netdev_queue_attr_store(struct kobject *kobj,
980 struct attribute *attr,
981 const char *buf, size_t count)
982{
983 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
984 struct netdev_queue *queue = to_netdev_queue(kobj);
985
986 if (!attribute->store)
987 return -EIO;
988
989 return attribute->store(queue, attribute, buf, count);
990}
991
992static const struct sysfs_ops netdev_queue_sysfs_ops = {
993 .show = netdev_queue_attr_show,
994 .store = netdev_queue_attr_store,
995};
996
997static ssize_t show_trans_timeout(struct netdev_queue *queue,
998 struct netdev_queue_attribute *attribute,
999 char *buf)
1000{
1001 unsigned long trans_timeout;
1002
1003 spin_lock_irq(&queue->_xmit_lock);
1004 trans_timeout = queue->trans_timeout;
1005 spin_unlock_irq(&queue->_xmit_lock);
1006
1007 return sprintf(buf, "%lu", trans_timeout);
1008}
1009
1010#ifdef CONFIG_XPS
1011static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1012{
1013 struct net_device *dev = queue->dev;
1014 unsigned int i;
1015
1016 i = queue - dev->_tx;
1017 BUG_ON(i >= dev->num_tx_queues);
1018
1019 return i;
1020}
1021
1022static ssize_t show_tx_maxrate(struct netdev_queue *queue,
1023 struct netdev_queue_attribute *attribute,
1024 char *buf)
1025{
1026 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1027}
1028
1029static ssize_t set_tx_maxrate(struct netdev_queue *queue,
1030 struct netdev_queue_attribute *attribute,
1031 const char *buf, size_t len)
1032{
1033 struct net_device *dev = queue->dev;
1034 int err, index = get_netdev_queue_index(queue);
1035 u32 rate = 0;
1036
1037 err = kstrtou32(buf, 10, &rate);
1038 if (err < 0)
1039 return err;
1040
1041 if (!rtnl_trylock())
1042 return restart_syscall();
1043
1044 err = -EOPNOTSUPP;
1045 if (dev->netdev_ops->ndo_set_tx_maxrate)
1046 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1047
1048 rtnl_unlock();
1049 if (!err) {
1050 queue->tx_maxrate = rate;
1051 return len;
1052 }
1053 return err;
1054}
1055
1056static struct netdev_queue_attribute queue_tx_maxrate =
1057 __ATTR(tx_maxrate, S_IRUGO | S_IWUSR,
1058 show_tx_maxrate, set_tx_maxrate);
1059#endif
1060
1061static struct netdev_queue_attribute queue_trans_timeout =
1062 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
1063
1064#ifdef CONFIG_BQL
1065/*
1066 * Byte queue limits sysfs structures and functions.
1067 */
1068static ssize_t bql_show(char *buf, unsigned int value)
1069{
1070 return sprintf(buf, "%u\n", value);
1071}
1072
1073static ssize_t bql_set(const char *buf, const size_t count,
1074 unsigned int *pvalue)
1075{
1076 unsigned int value;
1077 int err;
1078
1079 if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
1080 value = DQL_MAX_LIMIT;
1081 else {
1082 err = kstrtouint(buf, 10, &value);
1083 if (err < 0)
1084 return err;
1085 if (value > DQL_MAX_LIMIT)
1086 return -EINVAL;
1087 }
1088
1089 *pvalue = value;
1090
1091 return count;
1092}
1093
1094static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1095 struct netdev_queue_attribute *attr,
1096 char *buf)
1097{
1098 struct dql *dql = &queue->dql;
1099
1100 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1101}
1102
1103static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1104 struct netdev_queue_attribute *attribute,
1105 const char *buf, size_t len)
1106{
1107 struct dql *dql = &queue->dql;
1108 unsigned int value;
1109 int err;
1110
1111 err = kstrtouint(buf, 10, &value);
1112 if (err < 0)
1113 return err;
1114
1115 dql->slack_hold_time = msecs_to_jiffies(value);
1116
1117 return len;
1118}
1119
1120static struct netdev_queue_attribute bql_hold_time_attribute =
1121 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
1122 bql_set_hold_time);
1123
1124static ssize_t bql_show_inflight(struct netdev_queue *queue,
1125 struct netdev_queue_attribute *attr,
1126 char *buf)
1127{
1128 struct dql *dql = &queue->dql;
1129
1130 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1131}
1132
1133static struct netdev_queue_attribute bql_inflight_attribute =
1134 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1135
1136#define BQL_ATTR(NAME, FIELD) \
1137static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1138 struct netdev_queue_attribute *attr, \
1139 char *buf) \
1140{ \
1141 return bql_show(buf, queue->dql.FIELD); \
1142} \
1143 \
1144static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1145 struct netdev_queue_attribute *attr, \
1146 const char *buf, size_t len) \
1147{ \
1148 return bql_set(buf, len, &queue->dql.FIELD); \
1149} \
1150 \
1151static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \
1152 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \
1153 bql_set_ ## NAME);
1154
1155BQL_ATTR(limit, limit)
1156BQL_ATTR(limit_max, max_limit)
1157BQL_ATTR(limit_min, min_limit)
1158
1159static struct attribute *dql_attrs[] = {
1160 &bql_limit_attribute.attr,
1161 &bql_limit_max_attribute.attr,
1162 &bql_limit_min_attribute.attr,
1163 &bql_hold_time_attribute.attr,
1164 &bql_inflight_attribute.attr,
1165 NULL
1166};
1167
1168static struct attribute_group dql_group = {
1169 .name = "byte_queue_limits",
1170 .attrs = dql_attrs,
1171};
1172#endif /* CONFIG_BQL */
1173
1174#ifdef CONFIG_XPS
1175static ssize_t show_xps_map(struct netdev_queue *queue,
1176 struct netdev_queue_attribute *attribute, char *buf)
1177{
1178 struct net_device *dev = queue->dev;
1179 struct xps_dev_maps *dev_maps;
1180 cpumask_var_t mask;
1181 unsigned long index;
1182 int i, len;
1183
1184 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1185 return -ENOMEM;
1186
1187 index = get_netdev_queue_index(queue);
1188
1189 rcu_read_lock();
1190 dev_maps = rcu_dereference(dev->xps_maps);
1191 if (dev_maps) {
1192 for_each_possible_cpu(i) {
1193 struct xps_map *map =
1194 rcu_dereference(dev_maps->cpu_map[i]);
1195 if (map) {
1196 int j;
1197 for (j = 0; j < map->len; j++) {
1198 if (map->queues[j] == index) {
1199 cpumask_set_cpu(i, mask);
1200 break;
1201 }
1202 }
1203 }
1204 }
1205 }
1206 rcu_read_unlock();
1207
1208 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1209 free_cpumask_var(mask);
1210 return len < PAGE_SIZE ? len : -EINVAL;
1211}
1212
1213static ssize_t store_xps_map(struct netdev_queue *queue,
1214 struct netdev_queue_attribute *attribute,
1215 const char *buf, size_t len)
1216{
1217 struct net_device *dev = queue->dev;
1218 unsigned long index;
1219 cpumask_var_t mask;
1220 int err;
1221
1222 if (!capable(CAP_NET_ADMIN))
1223 return -EPERM;
1224
1225 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1226 return -ENOMEM;
1227
1228 index = get_netdev_queue_index(queue);
1229
1230 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1231 if (err) {
1232 free_cpumask_var(mask);
1233 return err;
1234 }
1235
1236 err = netif_set_xps_queue(dev, mask, index);
1237
1238 free_cpumask_var(mask);
1239
1240 return err ? : len;
1241}
1242
1243static struct netdev_queue_attribute xps_cpus_attribute =
1244 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1245#endif /* CONFIG_XPS */
1246
1247static struct attribute *netdev_queue_default_attrs[] = {
1248 &queue_trans_timeout.attr,
1249#ifdef CONFIG_XPS
1250 &xps_cpus_attribute.attr,
1251 &queue_tx_maxrate.attr,
1252#endif
1253 NULL
1254};
1255
1256static void netdev_queue_release(struct kobject *kobj)
1257{
1258 struct netdev_queue *queue = to_netdev_queue(kobj);
1259
1260 memset(kobj, 0, sizeof(*kobj));
1261 dev_put(queue->dev);
1262}
1263
1264static const void *netdev_queue_namespace(struct kobject *kobj)
1265{
1266 struct netdev_queue *queue = to_netdev_queue(kobj);
1267 struct device *dev = &queue->dev->dev;
1268 const void *ns = NULL;
1269
1270 if (dev->class && dev->class->ns_type)
1271 ns = dev->class->namespace(dev);
1272
1273 return ns;
1274}
1275
1276static struct kobj_type netdev_queue_ktype = {
1277 .sysfs_ops = &netdev_queue_sysfs_ops,
1278 .release = netdev_queue_release,
1279 .default_attrs = netdev_queue_default_attrs,
1280 .namespace = netdev_queue_namespace,
1281};
1282
1283static int netdev_queue_add_kobject(struct net_device *dev, int index)
1284{
1285 struct netdev_queue *queue = dev->_tx + index;
1286 struct kobject *kobj = &queue->kobj;
1287 int error = 0;
1288
1289 kobj->kset = dev->queues_kset;
1290 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1291 "tx-%u", index);
1292 if (error)
1293 goto exit;
1294
1295#ifdef CONFIG_BQL
1296 error = sysfs_create_group(kobj, &dql_group);
1297 if (error)
1298 goto exit;
1299#endif
1300
1301 kobject_uevent(kobj, KOBJ_ADD);
1302 dev_hold(queue->dev);
1303
1304 return 0;
1305exit:
1306 kobject_put(kobj);
1307 return error;
1308}
1309#endif /* CONFIG_SYSFS */
1310
1311int
1312netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1313{
1314#ifdef CONFIG_SYSFS
1315 int i;
1316 int error = 0;
1317
1318 for (i = old_num; i < new_num; i++) {
1319 error = netdev_queue_add_kobject(dev, i);
1320 if (error) {
1321 new_num = old_num;
1322 break;
1323 }
1324 }
1325
1326 while (--i >= new_num) {
1327 struct netdev_queue *queue = dev->_tx + i;
1328
1329#ifdef CONFIG_BQL
1330 sysfs_remove_group(&queue->kobj, &dql_group);
1331#endif
1332 kobject_put(&queue->kobj);
1333 }
1334
1335 return error;
1336#else
1337 return 0;
1338#endif /* CONFIG_SYSFS */
1339}
1340
1341static int register_queue_kobjects(struct net_device *dev)
1342{
1343 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1344
1345#ifdef CONFIG_SYSFS
1346 dev->queues_kset = kset_create_and_add("queues",
1347 NULL, &dev->dev.kobj);
1348 if (!dev->queues_kset)
1349 return -ENOMEM;
1350 real_rx = dev->real_num_rx_queues;
1351#endif
1352 real_tx = dev->real_num_tx_queues;
1353
1354 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1355 if (error)
1356 goto error;
1357 rxq = real_rx;
1358
1359 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1360 if (error)
1361 goto error;
1362 txq = real_tx;
1363
1364 return 0;
1365
1366error:
1367 netdev_queue_update_kobjects(dev, txq, 0);
1368 net_rx_queue_update_kobjects(dev, rxq, 0);
1369 return error;
1370}
1371
1372static void remove_queue_kobjects(struct net_device *dev)
1373{
1374 int real_rx = 0, real_tx = 0;
1375
1376#ifdef CONFIG_SYSFS
1377 real_rx = dev->real_num_rx_queues;
1378#endif
1379 real_tx = dev->real_num_tx_queues;
1380
1381 net_rx_queue_update_kobjects(dev, real_rx, 0);
1382 netdev_queue_update_kobjects(dev, real_tx, 0);
1383#ifdef CONFIG_SYSFS
1384 kset_unregister(dev->queues_kset);
1385#endif
1386}
1387
1388static bool net_current_may_mount(void)
1389{
1390 struct net *net = current->nsproxy->net_ns;
1391
1392 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1393}
1394
1395static void *net_grab_current_ns(void)
1396{
1397 struct net *ns = current->nsproxy->net_ns;
1398#ifdef CONFIG_NET_NS
1399 if (ns)
1400 atomic_inc(&ns->passive);
1401#endif
1402 return ns;
1403}
1404
1405static const void *net_initial_ns(void)
1406{
1407 return &init_net;
1408}
1409
1410static const void *net_netlink_ns(struct sock *sk)
1411{
1412 return sock_net(sk);
1413}
1414
1415struct kobj_ns_type_operations net_ns_type_operations = {
1416 .type = KOBJ_NS_TYPE_NET,
1417 .current_may_mount = net_current_may_mount,
1418 .grab_current_ns = net_grab_current_ns,
1419 .netlink_ns = net_netlink_ns,
1420 .initial_ns = net_initial_ns,
1421 .drop_ns = net_drop_ns,
1422};
1423EXPORT_SYMBOL_GPL(net_ns_type_operations);
1424
1425static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1426{
1427 struct net_device *dev = to_net_dev(d);
1428 int retval;
1429
1430 /* pass interface to uevent. */
1431 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1432 if (retval)
1433 goto exit;
1434
1435 /* pass ifindex to uevent.
1436 * ifindex is useful as it won't change (interface name may change)
1437 * and is what RtNetlink uses natively. */
1438 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1439
1440exit:
1441 return retval;
1442}
1443
1444/*
1445 * netdev_release -- destroy and free a dead device.
1446 * Called when last reference to device kobject is gone.
1447 */
1448static void netdev_release(struct device *d)
1449{
1450 struct net_device *dev = to_net_dev(d);
1451
1452 BUG_ON(dev->reg_state != NETREG_RELEASED);
1453
1454 kfree(dev->ifalias);
1455 netdev_freemem(dev);
1456}
1457
1458static const void *net_namespace(struct device *d)
1459{
1460 struct net_device *dev = to_net_dev(d);
1461
1462 return dev_net(dev);
1463}
1464
1465static struct class net_class = {
1466 .name = "net",
1467 .dev_release = netdev_release,
1468 .dev_groups = net_class_groups,
1469 .dev_uevent = netdev_uevent,
1470 .ns_type = &net_ns_type_operations,
1471 .namespace = net_namespace,
1472};
1473
1474#ifdef CONFIG_OF_NET
1475static int of_dev_node_match(struct device *dev, const void *data)
1476{
1477 int ret = 0;
1478
1479 if (dev->parent)
1480 ret = dev->parent->of_node == data;
1481
1482 return ret == 0 ? dev->of_node == data : ret;
1483}
1484
1485/*
1486 * of_find_net_device_by_node - lookup the net device for the device node
1487 * @np: OF device node
1488 *
1489 * Looks up the net_device structure corresponding with the device node.
1490 * If successful, returns a pointer to the net_device with the embedded
1491 * struct device refcount incremented by one, or NULL on failure. The
1492 * refcount must be dropped when done with the net_device.
1493 */
1494struct net_device *of_find_net_device_by_node(struct device_node *np)
1495{
1496 struct device *dev;
1497
1498 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1499 if (!dev)
1500 return NULL;
1501
1502 return to_net_dev(dev);
1503}
1504EXPORT_SYMBOL(of_find_net_device_by_node);
1505#endif
1506
1507/* Delete sysfs entries but hold kobject reference until after all
1508 * netdev references are gone.
1509 */
1510void netdev_unregister_kobject(struct net_device *ndev)
1511{
1512 struct device *dev = &(ndev->dev);
1513
1514 kobject_get(&dev->kobj);
1515
1516 remove_queue_kobjects(ndev);
1517
1518 pm_runtime_set_memalloc_noio(dev, false);
1519
1520 device_del(dev);
1521}
1522
1523/* Create sysfs entries for network device. */
1524int netdev_register_kobject(struct net_device *ndev)
1525{
1526 struct device *dev = &(ndev->dev);
1527 const struct attribute_group **groups = ndev->sysfs_groups;
1528 int error = 0;
1529
1530 device_initialize(dev);
1531 dev->class = &net_class;
1532 dev->platform_data = ndev;
1533 dev->groups = groups;
1534
1535 dev_set_name(dev, "%s", ndev->name);
1536
1537#ifdef CONFIG_SYSFS
1538 /* Allow for a device specific group */
1539 if (*groups)
1540 groups++;
1541
1542 *groups++ = &netstat_group;
1543
1544#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1545 if (ndev->ieee80211_ptr)
1546 *groups++ = &wireless_group;
1547#if IS_ENABLED(CONFIG_WIRELESS_EXT)
1548 else if (ndev->wireless_handlers)
1549 *groups++ = &wireless_group;
1550#endif
1551#endif
1552#endif /* CONFIG_SYSFS */
1553
1554 error = device_add(dev);
1555 if (error)
1556 return error;
1557
1558 error = register_queue_kobjects(ndev);
1559 if (error) {
1560 device_del(dev);
1561 return error;
1562 }
1563
1564 pm_runtime_set_memalloc_noio(dev, true);
1565
1566 return error;
1567}
1568
1569int netdev_class_create_file_ns(struct class_attribute *class_attr,
1570 const void *ns)
1571{
1572 return class_create_file_ns(&net_class, class_attr, ns);
1573}
1574EXPORT_SYMBOL(netdev_class_create_file_ns);
1575
1576void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1577 const void *ns)
1578{
1579 class_remove_file_ns(&net_class, class_attr, ns);
1580}
1581EXPORT_SYMBOL(netdev_class_remove_file_ns);
1582
1583int __init netdev_kobject_init(void)
1584{
1585 kobj_ns_type_register(&net_ns_type_operations);
1586 return class_register(&net_class);
1587}
1/*
2 * net-sysfs.c - network device class and attributes
3 *
4 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
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
30#include "net-sysfs.h"
31
32#ifdef CONFIG_SYSFS
33static const char fmt_hex[] = "%#x\n";
34static const char fmt_dec[] = "%d\n";
35static const char fmt_ulong[] = "%lu\n";
36static const char fmt_u64[] = "%llu\n";
37
38static inline int dev_isalive(const struct net_device *dev)
39{
40 return dev->reg_state <= NETREG_REGISTERED;
41}
42
43/* use same locking rules as GIF* ioctl's */
44static ssize_t netdev_show(const struct device *dev,
45 struct device_attribute *attr, char *buf,
46 ssize_t (*format)(const struct net_device *, char *))
47{
48 struct net_device *ndev = to_net_dev(dev);
49 ssize_t ret = -EINVAL;
50
51 read_lock(&dev_base_lock);
52 if (dev_isalive(ndev))
53 ret = (*format)(ndev, buf);
54 read_unlock(&dev_base_lock);
55
56 return ret;
57}
58
59/* generate a show function for simple field */
60#define NETDEVICE_SHOW(field, format_string) \
61static ssize_t format_##field(const struct net_device *dev, char *buf) \
62{ \
63 return sprintf(buf, format_string, dev->field); \
64} \
65static ssize_t field##_show(struct device *dev, \
66 struct device_attribute *attr, char *buf) \
67{ \
68 return netdev_show(dev, attr, buf, format_##field); \
69} \
70
71#define NETDEVICE_SHOW_RO(field, format_string) \
72NETDEVICE_SHOW(field, format_string); \
73static DEVICE_ATTR_RO(field)
74
75#define NETDEVICE_SHOW_RW(field, format_string) \
76NETDEVICE_SHOW(field, format_string); \
77static DEVICE_ATTR_RW(field)
78
79/* use same locking and permission rules as SIF* ioctl's */
80static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
81 const char *buf, size_t len,
82 int (*set)(struct net_device *, unsigned long))
83{
84 struct net_device *netdev = to_net_dev(dev);
85 struct net *net = dev_net(netdev);
86 unsigned long new;
87 int ret = -EINVAL;
88
89 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
90 return -EPERM;
91
92 ret = kstrtoul(buf, 0, &new);
93 if (ret)
94 goto err;
95
96 if (!rtnl_trylock())
97 return restart_syscall();
98
99 if (dev_isalive(netdev)) {
100 ret = (*set)(netdev, new);
101 if (ret == 0)
102 ret = len;
103 }
104 rtnl_unlock();
105 err:
106 return ret;
107}
108
109NETDEVICE_SHOW_RO(dev_id, fmt_hex);
110NETDEVICE_SHOW_RO(dev_port, fmt_dec);
111NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
112NETDEVICE_SHOW_RO(addr_len, fmt_dec);
113NETDEVICE_SHOW_RO(ifindex, fmt_dec);
114NETDEVICE_SHOW_RO(type, fmt_dec);
115NETDEVICE_SHOW_RO(link_mode, fmt_dec);
116
117static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
118 char *buf)
119{
120 struct net_device *ndev = to_net_dev(dev);
121
122 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
123}
124static DEVICE_ATTR_RO(iflink);
125
126static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
127{
128 return sprintf(buf, fmt_dec, dev->name_assign_type);
129}
130
131static ssize_t name_assign_type_show(struct device *dev,
132 struct device_attribute *attr,
133 char *buf)
134{
135 struct net_device *ndev = to_net_dev(dev);
136 ssize_t ret = -EINVAL;
137
138 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
139 ret = netdev_show(dev, attr, buf, format_name_assign_type);
140
141 return ret;
142}
143static DEVICE_ATTR_RO(name_assign_type);
144
145/* use same locking rules as GIFHWADDR ioctl's */
146static ssize_t address_show(struct device *dev, struct device_attribute *attr,
147 char *buf)
148{
149 struct net_device *ndev = to_net_dev(dev);
150 ssize_t ret = -EINVAL;
151
152 read_lock(&dev_base_lock);
153 if (dev_isalive(ndev))
154 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
155 read_unlock(&dev_base_lock);
156 return ret;
157}
158static DEVICE_ATTR_RO(address);
159
160static ssize_t broadcast_show(struct device *dev,
161 struct device_attribute *attr, char *buf)
162{
163 struct net_device *ndev = to_net_dev(dev);
164
165 if (dev_isalive(ndev))
166 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
167 return -EINVAL;
168}
169static DEVICE_ATTR_RO(broadcast);
170
171static int change_carrier(struct net_device *dev, unsigned long new_carrier)
172{
173 if (!netif_running(dev))
174 return -EINVAL;
175 return dev_change_carrier(dev, (bool)new_carrier);
176}
177
178static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
179 const char *buf, size_t len)
180{
181 return netdev_store(dev, attr, buf, len, change_carrier);
182}
183
184static ssize_t carrier_show(struct device *dev,
185 struct device_attribute *attr, char *buf)
186{
187 struct net_device *netdev = to_net_dev(dev);
188
189 if (netif_running(netdev))
190 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
191
192 return -EINVAL;
193}
194static DEVICE_ATTR_RW(carrier);
195
196static ssize_t speed_show(struct device *dev,
197 struct device_attribute *attr, char *buf)
198{
199 struct net_device *netdev = to_net_dev(dev);
200 int ret = -EINVAL;
201
202 if (!rtnl_trylock())
203 return restart_syscall();
204
205 if (netif_running(netdev)) {
206 struct ethtool_link_ksettings cmd;
207
208 if (!__ethtool_get_link_ksettings(netdev, &cmd))
209 ret = sprintf(buf, fmt_dec, cmd.base.speed);
210 }
211 rtnl_unlock();
212 return ret;
213}
214static DEVICE_ATTR_RO(speed);
215
216static ssize_t duplex_show(struct device *dev,
217 struct device_attribute *attr, char *buf)
218{
219 struct net_device *netdev = to_net_dev(dev);
220 int ret = -EINVAL;
221
222 if (!rtnl_trylock())
223 return restart_syscall();
224
225 if (netif_running(netdev)) {
226 struct ethtool_link_ksettings cmd;
227
228 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
229 const char *duplex;
230
231 switch (cmd.base.duplex) {
232 case DUPLEX_HALF:
233 duplex = "half";
234 break;
235 case DUPLEX_FULL:
236 duplex = "full";
237 break;
238 default:
239 duplex = "unknown";
240 break;
241 }
242 ret = sprintf(buf, "%s\n", duplex);
243 }
244 }
245 rtnl_unlock();
246 return ret;
247}
248static DEVICE_ATTR_RO(duplex);
249
250static ssize_t dormant_show(struct device *dev,
251 struct device_attribute *attr, char *buf)
252{
253 struct net_device *netdev = to_net_dev(dev);
254
255 if (netif_running(netdev))
256 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
257
258 return -EINVAL;
259}
260static DEVICE_ATTR_RO(dormant);
261
262static const char *const operstates[] = {
263 "unknown",
264 "notpresent", /* currently unused */
265 "down",
266 "lowerlayerdown",
267 "testing", /* currently unused */
268 "dormant",
269 "up"
270};
271
272static ssize_t operstate_show(struct device *dev,
273 struct device_attribute *attr, char *buf)
274{
275 const struct net_device *netdev = to_net_dev(dev);
276 unsigned char operstate;
277
278 read_lock(&dev_base_lock);
279 operstate = netdev->operstate;
280 if (!netif_running(netdev))
281 operstate = IF_OPER_DOWN;
282 read_unlock(&dev_base_lock);
283
284 if (operstate >= ARRAY_SIZE(operstates))
285 return -EINVAL; /* should not happen */
286
287 return sprintf(buf, "%s\n", operstates[operstate]);
288}
289static DEVICE_ATTR_RO(operstate);
290
291static ssize_t carrier_changes_show(struct device *dev,
292 struct device_attribute *attr,
293 char *buf)
294{
295 struct net_device *netdev = to_net_dev(dev);
296
297 return sprintf(buf, fmt_dec,
298 atomic_read(&netdev->carrier_up_count) +
299 atomic_read(&netdev->carrier_down_count));
300}
301static DEVICE_ATTR_RO(carrier_changes);
302
303static ssize_t carrier_up_count_show(struct device *dev,
304 struct device_attribute *attr,
305 char *buf)
306{
307 struct net_device *netdev = to_net_dev(dev);
308
309 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
310}
311static DEVICE_ATTR_RO(carrier_up_count);
312
313static ssize_t carrier_down_count_show(struct device *dev,
314 struct device_attribute *attr,
315 char *buf)
316{
317 struct net_device *netdev = to_net_dev(dev);
318
319 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
320}
321static DEVICE_ATTR_RO(carrier_down_count);
322
323/* read-write attributes */
324
325static int change_mtu(struct net_device *dev, unsigned long new_mtu)
326{
327 return dev_set_mtu(dev, (int)new_mtu);
328}
329
330static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
331 const char *buf, size_t len)
332{
333 return netdev_store(dev, attr, buf, len, change_mtu);
334}
335NETDEVICE_SHOW_RW(mtu, fmt_dec);
336
337static int change_flags(struct net_device *dev, unsigned long new_flags)
338{
339 return dev_change_flags(dev, (unsigned int)new_flags);
340}
341
342static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
343 const char *buf, size_t len)
344{
345 return netdev_store(dev, attr, buf, len, change_flags);
346}
347NETDEVICE_SHOW_RW(flags, fmt_hex);
348
349static ssize_t tx_queue_len_store(struct device *dev,
350 struct device_attribute *attr,
351 const char *buf, size_t len)
352{
353 if (!capable(CAP_NET_ADMIN))
354 return -EPERM;
355
356 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
357}
358NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
359
360static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
361{
362 dev->gro_flush_timeout = val;
363 return 0;
364}
365
366static ssize_t gro_flush_timeout_store(struct device *dev,
367 struct device_attribute *attr,
368 const char *buf, size_t len)
369{
370 if (!capable(CAP_NET_ADMIN))
371 return -EPERM;
372
373 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
374}
375NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
376
377static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
378 const char *buf, size_t len)
379{
380 struct net_device *netdev = to_net_dev(dev);
381 struct net *net = dev_net(netdev);
382 size_t count = len;
383 ssize_t ret = 0;
384
385 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
386 return -EPERM;
387
388 /* ignore trailing newline */
389 if (len > 0 && buf[len - 1] == '\n')
390 --count;
391
392 if (!rtnl_trylock())
393 return restart_syscall();
394
395 if (dev_isalive(netdev)) {
396 ret = dev_set_alias(netdev, buf, count);
397 if (ret < 0)
398 goto err;
399 ret = len;
400 netdev_state_change(netdev);
401 }
402err:
403 rtnl_unlock();
404
405 return ret;
406}
407
408static ssize_t ifalias_show(struct device *dev,
409 struct device_attribute *attr, char *buf)
410{
411 const struct net_device *netdev = to_net_dev(dev);
412 char tmp[IFALIASZ];
413 ssize_t ret = 0;
414
415 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
416 if (ret > 0)
417 ret = sprintf(buf, "%s\n", tmp);
418 return ret;
419}
420static DEVICE_ATTR_RW(ifalias);
421
422static int change_group(struct net_device *dev, unsigned long new_group)
423{
424 dev_set_group(dev, (int)new_group);
425 return 0;
426}
427
428static ssize_t group_store(struct device *dev, struct device_attribute *attr,
429 const char *buf, size_t len)
430{
431 return netdev_store(dev, attr, buf, len, change_group);
432}
433NETDEVICE_SHOW(group, fmt_dec);
434static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
435
436static int change_proto_down(struct net_device *dev, unsigned long proto_down)
437{
438 return dev_change_proto_down(dev, (bool)proto_down);
439}
440
441static ssize_t proto_down_store(struct device *dev,
442 struct device_attribute *attr,
443 const char *buf, size_t len)
444{
445 return netdev_store(dev, attr, buf, len, change_proto_down);
446}
447NETDEVICE_SHOW_RW(proto_down, fmt_dec);
448
449static ssize_t phys_port_id_show(struct device *dev,
450 struct device_attribute *attr, char *buf)
451{
452 struct net_device *netdev = to_net_dev(dev);
453 ssize_t ret = -EINVAL;
454
455 if (!rtnl_trylock())
456 return restart_syscall();
457
458 if (dev_isalive(netdev)) {
459 struct netdev_phys_item_id ppid;
460
461 ret = dev_get_phys_port_id(netdev, &ppid);
462 if (!ret)
463 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
464 }
465 rtnl_unlock();
466
467 return ret;
468}
469static DEVICE_ATTR_RO(phys_port_id);
470
471static ssize_t phys_port_name_show(struct device *dev,
472 struct device_attribute *attr, char *buf)
473{
474 struct net_device *netdev = to_net_dev(dev);
475 ssize_t ret = -EINVAL;
476
477 if (!rtnl_trylock())
478 return restart_syscall();
479
480 if (dev_isalive(netdev)) {
481 char name[IFNAMSIZ];
482
483 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
484 if (!ret)
485 ret = sprintf(buf, "%s\n", name);
486 }
487 rtnl_unlock();
488
489 return ret;
490}
491static DEVICE_ATTR_RO(phys_port_name);
492
493static ssize_t phys_switch_id_show(struct device *dev,
494 struct device_attribute *attr, char *buf)
495{
496 struct net_device *netdev = to_net_dev(dev);
497 ssize_t ret = -EINVAL;
498
499 if (!rtnl_trylock())
500 return restart_syscall();
501
502 if (dev_isalive(netdev)) {
503 struct switchdev_attr attr = {
504 .orig_dev = netdev,
505 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
506 .flags = SWITCHDEV_F_NO_RECURSE,
507 };
508
509 ret = switchdev_port_attr_get(netdev, &attr);
510 if (!ret)
511 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
512 attr.u.ppid.id);
513 }
514 rtnl_unlock();
515
516 return ret;
517}
518static DEVICE_ATTR_RO(phys_switch_id);
519
520static struct attribute *net_class_attrs[] __ro_after_init = {
521 &dev_attr_netdev_group.attr,
522 &dev_attr_type.attr,
523 &dev_attr_dev_id.attr,
524 &dev_attr_dev_port.attr,
525 &dev_attr_iflink.attr,
526 &dev_attr_ifindex.attr,
527 &dev_attr_name_assign_type.attr,
528 &dev_attr_addr_assign_type.attr,
529 &dev_attr_addr_len.attr,
530 &dev_attr_link_mode.attr,
531 &dev_attr_address.attr,
532 &dev_attr_broadcast.attr,
533 &dev_attr_speed.attr,
534 &dev_attr_duplex.attr,
535 &dev_attr_dormant.attr,
536 &dev_attr_operstate.attr,
537 &dev_attr_carrier_changes.attr,
538 &dev_attr_ifalias.attr,
539 &dev_attr_carrier.attr,
540 &dev_attr_mtu.attr,
541 &dev_attr_flags.attr,
542 &dev_attr_tx_queue_len.attr,
543 &dev_attr_gro_flush_timeout.attr,
544 &dev_attr_phys_port_id.attr,
545 &dev_attr_phys_port_name.attr,
546 &dev_attr_phys_switch_id.attr,
547 &dev_attr_proto_down.attr,
548 &dev_attr_carrier_up_count.attr,
549 &dev_attr_carrier_down_count.attr,
550 NULL,
551};
552ATTRIBUTE_GROUPS(net_class);
553
554/* Show a given an attribute in the statistics group */
555static ssize_t netstat_show(const struct device *d,
556 struct device_attribute *attr, char *buf,
557 unsigned long offset)
558{
559 struct net_device *dev = to_net_dev(d);
560 ssize_t ret = -EINVAL;
561
562 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
563 offset % sizeof(u64) != 0);
564
565 read_lock(&dev_base_lock);
566 if (dev_isalive(dev)) {
567 struct rtnl_link_stats64 temp;
568 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
569
570 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
571 }
572 read_unlock(&dev_base_lock);
573 return ret;
574}
575
576/* generate a read-only statistics attribute */
577#define NETSTAT_ENTRY(name) \
578static ssize_t name##_show(struct device *d, \
579 struct device_attribute *attr, char *buf) \
580{ \
581 return netstat_show(d, attr, buf, \
582 offsetof(struct rtnl_link_stats64, name)); \
583} \
584static DEVICE_ATTR_RO(name)
585
586NETSTAT_ENTRY(rx_packets);
587NETSTAT_ENTRY(tx_packets);
588NETSTAT_ENTRY(rx_bytes);
589NETSTAT_ENTRY(tx_bytes);
590NETSTAT_ENTRY(rx_errors);
591NETSTAT_ENTRY(tx_errors);
592NETSTAT_ENTRY(rx_dropped);
593NETSTAT_ENTRY(tx_dropped);
594NETSTAT_ENTRY(multicast);
595NETSTAT_ENTRY(collisions);
596NETSTAT_ENTRY(rx_length_errors);
597NETSTAT_ENTRY(rx_over_errors);
598NETSTAT_ENTRY(rx_crc_errors);
599NETSTAT_ENTRY(rx_frame_errors);
600NETSTAT_ENTRY(rx_fifo_errors);
601NETSTAT_ENTRY(rx_missed_errors);
602NETSTAT_ENTRY(tx_aborted_errors);
603NETSTAT_ENTRY(tx_carrier_errors);
604NETSTAT_ENTRY(tx_fifo_errors);
605NETSTAT_ENTRY(tx_heartbeat_errors);
606NETSTAT_ENTRY(tx_window_errors);
607NETSTAT_ENTRY(rx_compressed);
608NETSTAT_ENTRY(tx_compressed);
609NETSTAT_ENTRY(rx_nohandler);
610
611static struct attribute *netstat_attrs[] __ro_after_init = {
612 &dev_attr_rx_packets.attr,
613 &dev_attr_tx_packets.attr,
614 &dev_attr_rx_bytes.attr,
615 &dev_attr_tx_bytes.attr,
616 &dev_attr_rx_errors.attr,
617 &dev_attr_tx_errors.attr,
618 &dev_attr_rx_dropped.attr,
619 &dev_attr_tx_dropped.attr,
620 &dev_attr_multicast.attr,
621 &dev_attr_collisions.attr,
622 &dev_attr_rx_length_errors.attr,
623 &dev_attr_rx_over_errors.attr,
624 &dev_attr_rx_crc_errors.attr,
625 &dev_attr_rx_frame_errors.attr,
626 &dev_attr_rx_fifo_errors.attr,
627 &dev_attr_rx_missed_errors.attr,
628 &dev_attr_tx_aborted_errors.attr,
629 &dev_attr_tx_carrier_errors.attr,
630 &dev_attr_tx_fifo_errors.attr,
631 &dev_attr_tx_heartbeat_errors.attr,
632 &dev_attr_tx_window_errors.attr,
633 &dev_attr_rx_compressed.attr,
634 &dev_attr_tx_compressed.attr,
635 &dev_attr_rx_nohandler.attr,
636 NULL
637};
638
639static const struct attribute_group netstat_group = {
640 .name = "statistics",
641 .attrs = netstat_attrs,
642};
643
644#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
645static struct attribute *wireless_attrs[] = {
646 NULL
647};
648
649static const struct attribute_group wireless_group = {
650 .name = "wireless",
651 .attrs = wireless_attrs,
652};
653#endif
654
655#else /* CONFIG_SYSFS */
656#define net_class_groups NULL
657#endif /* CONFIG_SYSFS */
658
659#ifdef CONFIG_SYSFS
660#define to_rx_queue_attr(_attr) \
661 container_of(_attr, struct rx_queue_attribute, attr)
662
663#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
664
665static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
666 char *buf)
667{
668 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
669 struct netdev_rx_queue *queue = to_rx_queue(kobj);
670
671 if (!attribute->show)
672 return -EIO;
673
674 return attribute->show(queue, buf);
675}
676
677static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
678 const char *buf, size_t count)
679{
680 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
681 struct netdev_rx_queue *queue = to_rx_queue(kobj);
682
683 if (!attribute->store)
684 return -EIO;
685
686 return attribute->store(queue, buf, count);
687}
688
689static const struct sysfs_ops rx_queue_sysfs_ops = {
690 .show = rx_queue_attr_show,
691 .store = rx_queue_attr_store,
692};
693
694#ifdef CONFIG_RPS
695static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
696{
697 struct rps_map *map;
698 cpumask_var_t mask;
699 int i, len;
700
701 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
702 return -ENOMEM;
703
704 rcu_read_lock();
705 map = rcu_dereference(queue->rps_map);
706 if (map)
707 for (i = 0; i < map->len; i++)
708 cpumask_set_cpu(map->cpus[i], mask);
709
710 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
711 rcu_read_unlock();
712 free_cpumask_var(mask);
713
714 return len < PAGE_SIZE ? len : -EINVAL;
715}
716
717static ssize_t store_rps_map(struct netdev_rx_queue *queue,
718 const char *buf, size_t len)
719{
720 struct rps_map *old_map, *map;
721 cpumask_var_t mask;
722 int err, cpu, i;
723 static DEFINE_MUTEX(rps_map_mutex);
724
725 if (!capable(CAP_NET_ADMIN))
726 return -EPERM;
727
728 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
729 return -ENOMEM;
730
731 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
732 if (err) {
733 free_cpumask_var(mask);
734 return err;
735 }
736
737 map = kzalloc(max_t(unsigned int,
738 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
739 GFP_KERNEL);
740 if (!map) {
741 free_cpumask_var(mask);
742 return -ENOMEM;
743 }
744
745 i = 0;
746 for_each_cpu_and(cpu, mask, cpu_online_mask)
747 map->cpus[i++] = cpu;
748
749 if (i) {
750 map->len = i;
751 } else {
752 kfree(map);
753 map = NULL;
754 }
755
756 mutex_lock(&rps_map_mutex);
757 old_map = rcu_dereference_protected(queue->rps_map,
758 mutex_is_locked(&rps_map_mutex));
759 rcu_assign_pointer(queue->rps_map, map);
760
761 if (map)
762 static_key_slow_inc(&rps_needed);
763 if (old_map)
764 static_key_slow_dec(&rps_needed);
765
766 mutex_unlock(&rps_map_mutex);
767
768 if (old_map)
769 kfree_rcu(old_map, rcu);
770
771 free_cpumask_var(mask);
772 return len;
773}
774
775static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
776 char *buf)
777{
778 struct rps_dev_flow_table *flow_table;
779 unsigned long val = 0;
780
781 rcu_read_lock();
782 flow_table = rcu_dereference(queue->rps_flow_table);
783 if (flow_table)
784 val = (unsigned long)flow_table->mask + 1;
785 rcu_read_unlock();
786
787 return sprintf(buf, "%lu\n", val);
788}
789
790static void rps_dev_flow_table_release(struct rcu_head *rcu)
791{
792 struct rps_dev_flow_table *table = container_of(rcu,
793 struct rps_dev_flow_table, rcu);
794 vfree(table);
795}
796
797static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
798 const char *buf, size_t len)
799{
800 unsigned long mask, count;
801 struct rps_dev_flow_table *table, *old_table;
802 static DEFINE_SPINLOCK(rps_dev_flow_lock);
803 int rc;
804
805 if (!capable(CAP_NET_ADMIN))
806 return -EPERM;
807
808 rc = kstrtoul(buf, 0, &count);
809 if (rc < 0)
810 return rc;
811
812 if (count) {
813 mask = count - 1;
814 /* mask = roundup_pow_of_two(count) - 1;
815 * without overflows...
816 */
817 while ((mask | (mask >> 1)) != mask)
818 mask |= (mask >> 1);
819 /* On 64 bit arches, must check mask fits in table->mask (u32),
820 * and on 32bit arches, must check
821 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
822 */
823#if BITS_PER_LONG > 32
824 if (mask > (unsigned long)(u32)mask)
825 return -EINVAL;
826#else
827 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
828 / sizeof(struct rps_dev_flow)) {
829 /* Enforce a limit to prevent overflow */
830 return -EINVAL;
831 }
832#endif
833 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
834 if (!table)
835 return -ENOMEM;
836
837 table->mask = mask;
838 for (count = 0; count <= mask; count++)
839 table->flows[count].cpu = RPS_NO_CPU;
840 } else {
841 table = NULL;
842 }
843
844 spin_lock(&rps_dev_flow_lock);
845 old_table = rcu_dereference_protected(queue->rps_flow_table,
846 lockdep_is_held(&rps_dev_flow_lock));
847 rcu_assign_pointer(queue->rps_flow_table, table);
848 spin_unlock(&rps_dev_flow_lock);
849
850 if (old_table)
851 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
852
853 return len;
854}
855
856static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
857 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
858
859static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
860 = __ATTR(rps_flow_cnt, 0644,
861 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
862#endif /* CONFIG_RPS */
863
864static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
865#ifdef CONFIG_RPS
866 &rps_cpus_attribute.attr,
867 &rps_dev_flow_table_cnt_attribute.attr,
868#endif
869 NULL
870};
871
872static void rx_queue_release(struct kobject *kobj)
873{
874 struct netdev_rx_queue *queue = to_rx_queue(kobj);
875#ifdef CONFIG_RPS
876 struct rps_map *map;
877 struct rps_dev_flow_table *flow_table;
878
879 map = rcu_dereference_protected(queue->rps_map, 1);
880 if (map) {
881 RCU_INIT_POINTER(queue->rps_map, NULL);
882 kfree_rcu(map, rcu);
883 }
884
885 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
886 if (flow_table) {
887 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
888 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
889 }
890#endif
891
892 memset(kobj, 0, sizeof(*kobj));
893 dev_put(queue->dev);
894}
895
896static const void *rx_queue_namespace(struct kobject *kobj)
897{
898 struct netdev_rx_queue *queue = to_rx_queue(kobj);
899 struct device *dev = &queue->dev->dev;
900 const void *ns = NULL;
901
902 if (dev->class && dev->class->ns_type)
903 ns = dev->class->namespace(dev);
904
905 return ns;
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_attrs = rx_queue_default_attrs,
912 .namespace = rx_queue_namespace
913};
914
915static int rx_queue_add_kobject(struct net_device *dev, int index)
916{
917 struct netdev_rx_queue *queue = dev->_rx + index;
918 struct kobject *kobj = &queue->kobj;
919 int error = 0;
920
921 kobj->kset = dev->queues_kset;
922 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
923 "rx-%u", index);
924 if (error)
925 return error;
926
927 if (dev->sysfs_rx_queue_group) {
928 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
929 if (error) {
930 kobject_put(kobj);
931 return error;
932 }
933 }
934
935 kobject_uevent(kobj, KOBJ_ADD);
936 dev_hold(queue->dev);
937
938 return error;
939}
940#endif /* CONFIG_SYSFS */
941
942int
943net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
944{
945#ifdef CONFIG_SYSFS
946 int i;
947 int error = 0;
948
949#ifndef CONFIG_RPS
950 if (!dev->sysfs_rx_queue_group)
951 return 0;
952#endif
953 for (i = old_num; i < new_num; i++) {
954 error = rx_queue_add_kobject(dev, i);
955 if (error) {
956 new_num = old_num;
957 break;
958 }
959 }
960
961 while (--i >= new_num) {
962 struct kobject *kobj = &dev->_rx[i].kobj;
963
964 if (!refcount_read(&dev_net(dev)->count))
965 kobj->uevent_suppress = 1;
966 if (dev->sysfs_rx_queue_group)
967 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
968 kobject_put(kobj);
969 }
970
971 return error;
972#else
973 return 0;
974#endif
975}
976
977#ifdef CONFIG_SYSFS
978/*
979 * netdev_queue sysfs structures and functions.
980 */
981struct netdev_queue_attribute {
982 struct attribute attr;
983 ssize_t (*show)(struct netdev_queue *queue, char *buf);
984 ssize_t (*store)(struct netdev_queue *queue,
985 const char *buf, size_t len);
986};
987#define to_netdev_queue_attr(_attr) \
988 container_of(_attr, struct netdev_queue_attribute, attr)
989
990#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
991
992static ssize_t netdev_queue_attr_show(struct kobject *kobj,
993 struct attribute *attr, char *buf)
994{
995 const struct netdev_queue_attribute *attribute
996 = to_netdev_queue_attr(attr);
997 struct netdev_queue *queue = to_netdev_queue(kobj);
998
999 if (!attribute->show)
1000 return -EIO;
1001
1002 return attribute->show(queue, buf);
1003}
1004
1005static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1006 struct attribute *attr,
1007 const char *buf, size_t count)
1008{
1009 const struct netdev_queue_attribute *attribute
1010 = to_netdev_queue_attr(attr);
1011 struct netdev_queue *queue = to_netdev_queue(kobj);
1012
1013 if (!attribute->store)
1014 return -EIO;
1015
1016 return attribute->store(queue, buf, count);
1017}
1018
1019static const struct sysfs_ops netdev_queue_sysfs_ops = {
1020 .show = netdev_queue_attr_show,
1021 .store = netdev_queue_attr_store,
1022};
1023
1024static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1025{
1026 unsigned long trans_timeout;
1027
1028 spin_lock_irq(&queue->_xmit_lock);
1029 trans_timeout = queue->trans_timeout;
1030 spin_unlock_irq(&queue->_xmit_lock);
1031
1032 return sprintf(buf, "%lu", trans_timeout);
1033}
1034
1035static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1036{
1037 struct net_device *dev = queue->dev;
1038 unsigned int i;
1039
1040 i = queue - dev->_tx;
1041 BUG_ON(i >= dev->num_tx_queues);
1042
1043 return i;
1044}
1045
1046static ssize_t traffic_class_show(struct netdev_queue *queue,
1047 char *buf)
1048{
1049 struct net_device *dev = queue->dev;
1050 int index = get_netdev_queue_index(queue);
1051 int tc = netdev_txq_to_tc(dev, index);
1052
1053 if (tc < 0)
1054 return -EINVAL;
1055
1056 return sprintf(buf, "%u\n", tc);
1057}
1058
1059#ifdef CONFIG_XPS
1060static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1061 char *buf)
1062{
1063 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1064}
1065
1066static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1067 const char *buf, size_t len)
1068{
1069 struct net_device *dev = queue->dev;
1070 int err, index = get_netdev_queue_index(queue);
1071 u32 rate = 0;
1072
1073 err = kstrtou32(buf, 10, &rate);
1074 if (err < 0)
1075 return err;
1076
1077 if (!rtnl_trylock())
1078 return restart_syscall();
1079
1080 err = -EOPNOTSUPP;
1081 if (dev->netdev_ops->ndo_set_tx_maxrate)
1082 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1083
1084 rtnl_unlock();
1085 if (!err) {
1086 queue->tx_maxrate = rate;
1087 return len;
1088 }
1089 return err;
1090}
1091
1092static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1093 = __ATTR_RW(tx_maxrate);
1094#endif
1095
1096static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1097 = __ATTR_RO(tx_timeout);
1098
1099static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1100 = __ATTR_RO(traffic_class);
1101
1102#ifdef CONFIG_BQL
1103/*
1104 * Byte queue limits sysfs structures and functions.
1105 */
1106static ssize_t bql_show(char *buf, unsigned int value)
1107{
1108 return sprintf(buf, "%u\n", value);
1109}
1110
1111static ssize_t bql_set(const char *buf, const size_t count,
1112 unsigned int *pvalue)
1113{
1114 unsigned int value;
1115 int err;
1116
1117 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1118 value = DQL_MAX_LIMIT;
1119 } else {
1120 err = kstrtouint(buf, 10, &value);
1121 if (err < 0)
1122 return err;
1123 if (value > DQL_MAX_LIMIT)
1124 return -EINVAL;
1125 }
1126
1127 *pvalue = value;
1128
1129 return count;
1130}
1131
1132static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1133 char *buf)
1134{
1135 struct dql *dql = &queue->dql;
1136
1137 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1138}
1139
1140static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1141 const char *buf, size_t len)
1142{
1143 struct dql *dql = &queue->dql;
1144 unsigned int value;
1145 int err;
1146
1147 err = kstrtouint(buf, 10, &value);
1148 if (err < 0)
1149 return err;
1150
1151 dql->slack_hold_time = msecs_to_jiffies(value);
1152
1153 return len;
1154}
1155
1156static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1157 = __ATTR(hold_time, 0644,
1158 bql_show_hold_time, bql_set_hold_time);
1159
1160static ssize_t bql_show_inflight(struct netdev_queue *queue,
1161 char *buf)
1162{
1163 struct dql *dql = &queue->dql;
1164
1165 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1166}
1167
1168static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1169 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1170
1171#define BQL_ATTR(NAME, FIELD) \
1172static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1173 char *buf) \
1174{ \
1175 return bql_show(buf, queue->dql.FIELD); \
1176} \
1177 \
1178static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1179 const char *buf, size_t len) \
1180{ \
1181 return bql_set(buf, len, &queue->dql.FIELD); \
1182} \
1183 \
1184static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1185 = __ATTR(NAME, 0644, \
1186 bql_show_ ## NAME, bql_set_ ## NAME)
1187
1188BQL_ATTR(limit, limit);
1189BQL_ATTR(limit_max, max_limit);
1190BQL_ATTR(limit_min, min_limit);
1191
1192static struct attribute *dql_attrs[] __ro_after_init = {
1193 &bql_limit_attribute.attr,
1194 &bql_limit_max_attribute.attr,
1195 &bql_limit_min_attribute.attr,
1196 &bql_hold_time_attribute.attr,
1197 &bql_inflight_attribute.attr,
1198 NULL
1199};
1200
1201static const struct attribute_group dql_group = {
1202 .name = "byte_queue_limits",
1203 .attrs = dql_attrs,
1204};
1205#endif /* CONFIG_BQL */
1206
1207#ifdef CONFIG_XPS
1208static ssize_t xps_cpus_show(struct netdev_queue *queue,
1209 char *buf)
1210{
1211 struct net_device *dev = queue->dev;
1212 int cpu, len, num_tc = 1, tc = 0;
1213 struct xps_dev_maps *dev_maps;
1214 cpumask_var_t mask;
1215 unsigned long index;
1216
1217 index = get_netdev_queue_index(queue);
1218
1219 if (dev->num_tc) {
1220 num_tc = dev->num_tc;
1221 tc = netdev_txq_to_tc(dev, index);
1222 if (tc < 0)
1223 return -EINVAL;
1224 }
1225
1226 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1227 return -ENOMEM;
1228
1229 rcu_read_lock();
1230 dev_maps = rcu_dereference(dev->xps_maps);
1231 if (dev_maps) {
1232 for_each_possible_cpu(cpu) {
1233 int i, tci = cpu * num_tc + tc;
1234 struct xps_map *map;
1235
1236 map = rcu_dereference(dev_maps->cpu_map[tci]);
1237 if (!map)
1238 continue;
1239
1240 for (i = map->len; i--;) {
1241 if (map->queues[i] == index) {
1242 cpumask_set_cpu(cpu, mask);
1243 break;
1244 }
1245 }
1246 }
1247 }
1248 rcu_read_unlock();
1249
1250 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1251 free_cpumask_var(mask);
1252 return len < PAGE_SIZE ? len : -EINVAL;
1253}
1254
1255static ssize_t xps_cpus_store(struct netdev_queue *queue,
1256 const char *buf, size_t len)
1257{
1258 struct net_device *dev = queue->dev;
1259 unsigned long index;
1260 cpumask_var_t mask;
1261 int err;
1262
1263 if (!capable(CAP_NET_ADMIN))
1264 return -EPERM;
1265
1266 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1267 return -ENOMEM;
1268
1269 index = get_netdev_queue_index(queue);
1270
1271 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1272 if (err) {
1273 free_cpumask_var(mask);
1274 return err;
1275 }
1276
1277 err = netif_set_xps_queue(dev, mask, index);
1278
1279 free_cpumask_var(mask);
1280
1281 return err ? : len;
1282}
1283
1284static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1285 = __ATTR_RW(xps_cpus);
1286#endif /* CONFIG_XPS */
1287
1288static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1289 &queue_trans_timeout.attr,
1290 &queue_traffic_class.attr,
1291#ifdef CONFIG_XPS
1292 &xps_cpus_attribute.attr,
1293 &queue_tx_maxrate.attr,
1294#endif
1295 NULL
1296};
1297
1298static void netdev_queue_release(struct kobject *kobj)
1299{
1300 struct netdev_queue *queue = to_netdev_queue(kobj);
1301
1302 memset(kobj, 0, sizeof(*kobj));
1303 dev_put(queue->dev);
1304}
1305
1306static const void *netdev_queue_namespace(struct kobject *kobj)
1307{
1308 struct netdev_queue *queue = to_netdev_queue(kobj);
1309 struct device *dev = &queue->dev->dev;
1310 const void *ns = NULL;
1311
1312 if (dev->class && dev->class->ns_type)
1313 ns = dev->class->namespace(dev);
1314
1315 return ns;
1316}
1317
1318static struct kobj_type netdev_queue_ktype __ro_after_init = {
1319 .sysfs_ops = &netdev_queue_sysfs_ops,
1320 .release = netdev_queue_release,
1321 .default_attrs = netdev_queue_default_attrs,
1322 .namespace = netdev_queue_namespace,
1323};
1324
1325static int netdev_queue_add_kobject(struct net_device *dev, int index)
1326{
1327 struct netdev_queue *queue = dev->_tx + index;
1328 struct kobject *kobj = &queue->kobj;
1329 int error = 0;
1330
1331 kobj->kset = dev->queues_kset;
1332 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1333 "tx-%u", index);
1334 if (error)
1335 return error;
1336
1337#ifdef CONFIG_BQL
1338 error = sysfs_create_group(kobj, &dql_group);
1339 if (error) {
1340 kobject_put(kobj);
1341 return error;
1342 }
1343#endif
1344
1345 kobject_uevent(kobj, KOBJ_ADD);
1346 dev_hold(queue->dev);
1347
1348 return 0;
1349}
1350#endif /* CONFIG_SYSFS */
1351
1352int
1353netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1354{
1355#ifdef CONFIG_SYSFS
1356 int i;
1357 int error = 0;
1358
1359 for (i = old_num; i < new_num; i++) {
1360 error = netdev_queue_add_kobject(dev, i);
1361 if (error) {
1362 new_num = old_num;
1363 break;
1364 }
1365 }
1366
1367 while (--i >= new_num) {
1368 struct netdev_queue *queue = dev->_tx + i;
1369
1370 if (!refcount_read(&dev_net(dev)->count))
1371 queue->kobj.uevent_suppress = 1;
1372#ifdef CONFIG_BQL
1373 sysfs_remove_group(&queue->kobj, &dql_group);
1374#endif
1375 kobject_put(&queue->kobj);
1376 }
1377
1378 return error;
1379#else
1380 return 0;
1381#endif /* CONFIG_SYSFS */
1382}
1383
1384static int register_queue_kobjects(struct net_device *dev)
1385{
1386 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1387
1388#ifdef CONFIG_SYSFS
1389 dev->queues_kset = kset_create_and_add("queues",
1390 NULL, &dev->dev.kobj);
1391 if (!dev->queues_kset)
1392 return -ENOMEM;
1393 real_rx = dev->real_num_rx_queues;
1394#endif
1395 real_tx = dev->real_num_tx_queues;
1396
1397 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1398 if (error)
1399 goto error;
1400 rxq = real_rx;
1401
1402 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1403 if (error)
1404 goto error;
1405 txq = real_tx;
1406
1407 return 0;
1408
1409error:
1410 netdev_queue_update_kobjects(dev, txq, 0);
1411 net_rx_queue_update_kobjects(dev, rxq, 0);
1412 return error;
1413}
1414
1415static void remove_queue_kobjects(struct net_device *dev)
1416{
1417 int real_rx = 0, real_tx = 0;
1418
1419#ifdef CONFIG_SYSFS
1420 real_rx = dev->real_num_rx_queues;
1421#endif
1422 real_tx = dev->real_num_tx_queues;
1423
1424 net_rx_queue_update_kobjects(dev, real_rx, 0);
1425 netdev_queue_update_kobjects(dev, real_tx, 0);
1426#ifdef CONFIG_SYSFS
1427 kset_unregister(dev->queues_kset);
1428#endif
1429}
1430
1431static bool net_current_may_mount(void)
1432{
1433 struct net *net = current->nsproxy->net_ns;
1434
1435 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1436}
1437
1438static void *net_grab_current_ns(void)
1439{
1440 struct net *ns = current->nsproxy->net_ns;
1441#ifdef CONFIG_NET_NS
1442 if (ns)
1443 refcount_inc(&ns->passive);
1444#endif
1445 return ns;
1446}
1447
1448static const void *net_initial_ns(void)
1449{
1450 return &init_net;
1451}
1452
1453static const void *net_netlink_ns(struct sock *sk)
1454{
1455 return sock_net(sk);
1456}
1457
1458const struct kobj_ns_type_operations net_ns_type_operations = {
1459 .type = KOBJ_NS_TYPE_NET,
1460 .current_may_mount = net_current_may_mount,
1461 .grab_current_ns = net_grab_current_ns,
1462 .netlink_ns = net_netlink_ns,
1463 .initial_ns = net_initial_ns,
1464 .drop_ns = net_drop_ns,
1465};
1466EXPORT_SYMBOL_GPL(net_ns_type_operations);
1467
1468static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1469{
1470 struct net_device *dev = to_net_dev(d);
1471 int retval;
1472
1473 /* pass interface to uevent. */
1474 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1475 if (retval)
1476 goto exit;
1477
1478 /* pass ifindex to uevent.
1479 * ifindex is useful as it won't change (interface name may change)
1480 * and is what RtNetlink uses natively.
1481 */
1482 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1483
1484exit:
1485 return retval;
1486}
1487
1488/*
1489 * netdev_release -- destroy and free a dead device.
1490 * Called when last reference to device kobject is gone.
1491 */
1492static void netdev_release(struct device *d)
1493{
1494 struct net_device *dev = to_net_dev(d);
1495
1496 BUG_ON(dev->reg_state != NETREG_RELEASED);
1497
1498 /* no need to wait for rcu grace period:
1499 * device is dead and about to be freed.
1500 */
1501 kfree(rcu_access_pointer(dev->ifalias));
1502 netdev_freemem(dev);
1503}
1504
1505static const void *net_namespace(struct device *d)
1506{
1507 struct net_device *dev = to_net_dev(d);
1508
1509 return dev_net(dev);
1510}
1511
1512static struct class net_class __ro_after_init = {
1513 .name = "net",
1514 .dev_release = netdev_release,
1515 .dev_groups = net_class_groups,
1516 .dev_uevent = netdev_uevent,
1517 .ns_type = &net_ns_type_operations,
1518 .namespace = net_namespace,
1519};
1520
1521#ifdef CONFIG_OF_NET
1522static int of_dev_node_match(struct device *dev, const void *data)
1523{
1524 int ret = 0;
1525
1526 if (dev->parent)
1527 ret = dev->parent->of_node == data;
1528
1529 return ret == 0 ? dev->of_node == data : ret;
1530}
1531
1532/*
1533 * of_find_net_device_by_node - lookup the net device for the device node
1534 * @np: OF device node
1535 *
1536 * Looks up the net_device structure corresponding with the device node.
1537 * If successful, returns a pointer to the net_device with the embedded
1538 * struct device refcount incremented by one, or NULL on failure. The
1539 * refcount must be dropped when done with the net_device.
1540 */
1541struct net_device *of_find_net_device_by_node(struct device_node *np)
1542{
1543 struct device *dev;
1544
1545 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1546 if (!dev)
1547 return NULL;
1548
1549 return to_net_dev(dev);
1550}
1551EXPORT_SYMBOL(of_find_net_device_by_node);
1552#endif
1553
1554/* Delete sysfs entries but hold kobject reference until after all
1555 * netdev references are gone.
1556 */
1557void netdev_unregister_kobject(struct net_device *ndev)
1558{
1559 struct device *dev = &ndev->dev;
1560
1561 if (!refcount_read(&dev_net(ndev)->count))
1562 dev_set_uevent_suppress(dev, 1);
1563
1564 kobject_get(&dev->kobj);
1565
1566 remove_queue_kobjects(ndev);
1567
1568 pm_runtime_set_memalloc_noio(dev, false);
1569
1570 device_del(dev);
1571}
1572
1573/* Create sysfs entries for network device. */
1574int netdev_register_kobject(struct net_device *ndev)
1575{
1576 struct device *dev = &ndev->dev;
1577 const struct attribute_group **groups = ndev->sysfs_groups;
1578 int error = 0;
1579
1580 device_initialize(dev);
1581 dev->class = &net_class;
1582 dev->platform_data = ndev;
1583 dev->groups = groups;
1584
1585 dev_set_name(dev, "%s", ndev->name);
1586
1587#ifdef CONFIG_SYSFS
1588 /* Allow for a device specific group */
1589 if (*groups)
1590 groups++;
1591
1592 *groups++ = &netstat_group;
1593
1594#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1595 if (ndev->ieee80211_ptr)
1596 *groups++ = &wireless_group;
1597#if IS_ENABLED(CONFIG_WIRELESS_EXT)
1598 else if (ndev->wireless_handlers)
1599 *groups++ = &wireless_group;
1600#endif
1601#endif
1602#endif /* CONFIG_SYSFS */
1603
1604 error = device_add(dev);
1605 if (error)
1606 return error;
1607
1608 error = register_queue_kobjects(ndev);
1609 if (error) {
1610 device_del(dev);
1611 return error;
1612 }
1613
1614 pm_runtime_set_memalloc_noio(dev, true);
1615
1616 return error;
1617}
1618
1619int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1620 const void *ns)
1621{
1622 return class_create_file_ns(&net_class, class_attr, ns);
1623}
1624EXPORT_SYMBOL(netdev_class_create_file_ns);
1625
1626void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1627 const void *ns)
1628{
1629 class_remove_file_ns(&net_class, class_attr, ns);
1630}
1631EXPORT_SYMBOL(netdev_class_remove_file_ns);
1632
1633int __init netdev_kobject_init(void)
1634{
1635 kobj_ns_type_register(&net_ns_type_operations);
1636 return class_register(&net_class);
1637}