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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 <linux/if_arp.h>
16#include <linux/slab.h>
17#include <linux/nsproxy.h>
18#include <net/sock.h>
19#include <net/net_namespace.h>
20#include <linux/rtnetlink.h>
21#include <linux/wireless.h>
22#include <linux/vmalloc.h>
23#include <net/wext.h>
24
25#include "net-sysfs.h"
26
27#ifdef CONFIG_SYSFS
28static const char fmt_hex[] = "%#x\n";
29static const char fmt_long_hex[] = "%#lx\n";
30static const char fmt_dec[] = "%d\n";
31static const char fmt_udec[] = "%u\n";
32static const char fmt_ulong[] = "%lu\n";
33static const char fmt_u64[] = "%llu\n";
34
35static inline int dev_isalive(const struct net_device *dev)
36{
37 return dev->reg_state <= NETREG_REGISTERED;
38}
39
40/* use same locking rules as GIF* ioctl's */
41static ssize_t netdev_show(const struct device *dev,
42 struct device_attribute *attr, char *buf,
43 ssize_t (*format)(const struct net_device *, char *))
44{
45 struct net_device *net = to_net_dev(dev);
46 ssize_t ret = -EINVAL;
47
48 read_lock(&dev_base_lock);
49 if (dev_isalive(net))
50 ret = (*format)(net, buf);
51 read_unlock(&dev_base_lock);
52
53 return ret;
54}
55
56/* generate a show function for simple field */
57#define NETDEVICE_SHOW(field, format_string) \
58static ssize_t format_##field(const struct net_device *net, char *buf) \
59{ \
60 return sprintf(buf, format_string, net->field); \
61} \
62static ssize_t show_##field(struct device *dev, \
63 struct device_attribute *attr, char *buf) \
64{ \
65 return netdev_show(dev, attr, buf, format_##field); \
66}
67
68
69/* use same locking and permission rules as SIF* ioctl's */
70static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
71 const char *buf, size_t len,
72 int (*set)(struct net_device *, unsigned long))
73{
74 struct net_device *net = to_net_dev(dev);
75 char *endp;
76 unsigned long new;
77 int ret = -EINVAL;
78
79 if (!capable(CAP_NET_ADMIN))
80 return -EPERM;
81
82 new = simple_strtoul(buf, &endp, 0);
83 if (endp == buf)
84 goto err;
85
86 if (!rtnl_trylock())
87 return restart_syscall();
88
89 if (dev_isalive(net)) {
90 if ((ret = (*set)(net, new)) == 0)
91 ret = len;
92 }
93 rtnl_unlock();
94 err:
95 return ret;
96}
97
98NETDEVICE_SHOW(dev_id, fmt_hex);
99NETDEVICE_SHOW(addr_assign_type, fmt_dec);
100NETDEVICE_SHOW(addr_len, fmt_dec);
101NETDEVICE_SHOW(iflink, fmt_dec);
102NETDEVICE_SHOW(ifindex, fmt_dec);
103NETDEVICE_SHOW(type, fmt_dec);
104NETDEVICE_SHOW(link_mode, fmt_dec);
105
106/* use same locking rules as GIFHWADDR ioctl's */
107static ssize_t show_address(struct device *dev, struct device_attribute *attr,
108 char *buf)
109{
110 struct net_device *net = to_net_dev(dev);
111 ssize_t ret = -EINVAL;
112
113 read_lock(&dev_base_lock);
114 if (dev_isalive(net))
115 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
116 read_unlock(&dev_base_lock);
117 return ret;
118}
119
120static ssize_t show_broadcast(struct device *dev,
121 struct device_attribute *attr, char *buf)
122{
123 struct net_device *net = to_net_dev(dev);
124 if (dev_isalive(net))
125 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
126 return -EINVAL;
127}
128
129static ssize_t show_carrier(struct device *dev,
130 struct device_attribute *attr, char *buf)
131{
132 struct net_device *netdev = to_net_dev(dev);
133 if (netif_running(netdev)) {
134 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
135 }
136 return -EINVAL;
137}
138
139static ssize_t show_speed(struct device *dev,
140 struct device_attribute *attr, char *buf)
141{
142 struct net_device *netdev = to_net_dev(dev);
143 int ret = -EINVAL;
144
145 if (!rtnl_trylock())
146 return restart_syscall();
147
148 if (netif_running(netdev)) {
149 struct ethtool_cmd cmd;
150 if (!dev_ethtool_get_settings(netdev, &cmd))
151 ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
152 }
153 rtnl_unlock();
154 return ret;
155}
156
157static ssize_t show_duplex(struct device *dev,
158 struct device_attribute *attr, char *buf)
159{
160 struct net_device *netdev = to_net_dev(dev);
161 int ret = -EINVAL;
162
163 if (!rtnl_trylock())
164 return restart_syscall();
165
166 if (netif_running(netdev)) {
167 struct ethtool_cmd cmd;
168 if (!dev_ethtool_get_settings(netdev, &cmd))
169 ret = sprintf(buf, "%s\n",
170 cmd.duplex ? "full" : "half");
171 }
172 rtnl_unlock();
173 return ret;
174}
175
176static ssize_t show_dormant(struct device *dev,
177 struct device_attribute *attr, char *buf)
178{
179 struct net_device *netdev = to_net_dev(dev);
180
181 if (netif_running(netdev))
182 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
183
184 return -EINVAL;
185}
186
187static const char *const operstates[] = {
188 "unknown",
189 "notpresent", /* currently unused */
190 "down",
191 "lowerlayerdown",
192 "testing", /* currently unused */
193 "dormant",
194 "up"
195};
196
197static ssize_t show_operstate(struct device *dev,
198 struct device_attribute *attr, char *buf)
199{
200 const struct net_device *netdev = to_net_dev(dev);
201 unsigned char operstate;
202
203 read_lock(&dev_base_lock);
204 operstate = netdev->operstate;
205 if (!netif_running(netdev))
206 operstate = IF_OPER_DOWN;
207 read_unlock(&dev_base_lock);
208
209 if (operstate >= ARRAY_SIZE(operstates))
210 return -EINVAL; /* should not happen */
211
212 return sprintf(buf, "%s\n", operstates[operstate]);
213}
214
215/* read-write attributes */
216NETDEVICE_SHOW(mtu, fmt_dec);
217
218static int change_mtu(struct net_device *net, unsigned long new_mtu)
219{
220 return dev_set_mtu(net, (int) new_mtu);
221}
222
223static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
224 const char *buf, size_t len)
225{
226 return netdev_store(dev, attr, buf, len, change_mtu);
227}
228
229NETDEVICE_SHOW(flags, fmt_hex);
230
231static int change_flags(struct net_device *net, unsigned long new_flags)
232{
233 return dev_change_flags(net, (unsigned) new_flags);
234}
235
236static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
237 const char *buf, size_t len)
238{
239 return netdev_store(dev, attr, buf, len, change_flags);
240}
241
242NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
243
244static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
245{
246 net->tx_queue_len = new_len;
247 return 0;
248}
249
250static ssize_t store_tx_queue_len(struct device *dev,
251 struct device_attribute *attr,
252 const char *buf, size_t len)
253{
254 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
255}
256
257static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
258 const char *buf, size_t len)
259{
260 struct net_device *netdev = to_net_dev(dev);
261 size_t count = len;
262 ssize_t ret;
263
264 if (!capable(CAP_NET_ADMIN))
265 return -EPERM;
266
267 /* ignore trailing newline */
268 if (len > 0 && buf[len - 1] == '\n')
269 --count;
270
271 if (!rtnl_trylock())
272 return restart_syscall();
273 ret = dev_set_alias(netdev, buf, count);
274 rtnl_unlock();
275
276 return ret < 0 ? ret : len;
277}
278
279static ssize_t show_ifalias(struct device *dev,
280 struct device_attribute *attr, char *buf)
281{
282 const struct net_device *netdev = to_net_dev(dev);
283 ssize_t ret = 0;
284
285 if (!rtnl_trylock())
286 return restart_syscall();
287 if (netdev->ifalias)
288 ret = sprintf(buf, "%s\n", netdev->ifalias);
289 rtnl_unlock();
290 return ret;
291}
292
293NETDEVICE_SHOW(group, fmt_dec);
294
295static int change_group(struct net_device *net, unsigned long new_group)
296{
297 dev_set_group(net, (int) new_group);
298 return 0;
299}
300
301static ssize_t store_group(struct device *dev, struct device_attribute *attr,
302 const char *buf, size_t len)
303{
304 return netdev_store(dev, attr, buf, len, change_group);
305}
306
307static struct device_attribute net_class_attributes[] = {
308 __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
309 __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
310 __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
311 __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
312 __ATTR(iflink, S_IRUGO, show_iflink, NULL),
313 __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
314 __ATTR(type, S_IRUGO, show_type, NULL),
315 __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
316 __ATTR(address, S_IRUGO, show_address, NULL),
317 __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
318 __ATTR(carrier, S_IRUGO, show_carrier, NULL),
319 __ATTR(speed, S_IRUGO, show_speed, NULL),
320 __ATTR(duplex, S_IRUGO, show_duplex, NULL),
321 __ATTR(dormant, S_IRUGO, show_dormant, NULL),
322 __ATTR(operstate, S_IRUGO, show_operstate, NULL),
323 __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
324 __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
325 __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
326 store_tx_queue_len),
327 __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
328 {}
329};
330
331/* Show a given an attribute in the statistics group */
332static ssize_t netstat_show(const struct device *d,
333 struct device_attribute *attr, char *buf,
334 unsigned long offset)
335{
336 struct net_device *dev = to_net_dev(d);
337 ssize_t ret = -EINVAL;
338
339 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
340 offset % sizeof(u64) != 0);
341
342 read_lock(&dev_base_lock);
343 if (dev_isalive(dev)) {
344 struct rtnl_link_stats64 temp;
345 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
346
347 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
348 }
349 read_unlock(&dev_base_lock);
350 return ret;
351}
352
353/* generate a read-only statistics attribute */
354#define NETSTAT_ENTRY(name) \
355static ssize_t show_##name(struct device *d, \
356 struct device_attribute *attr, char *buf) \
357{ \
358 return netstat_show(d, attr, buf, \
359 offsetof(struct rtnl_link_stats64, name)); \
360} \
361static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
362
363NETSTAT_ENTRY(rx_packets);
364NETSTAT_ENTRY(tx_packets);
365NETSTAT_ENTRY(rx_bytes);
366NETSTAT_ENTRY(tx_bytes);
367NETSTAT_ENTRY(rx_errors);
368NETSTAT_ENTRY(tx_errors);
369NETSTAT_ENTRY(rx_dropped);
370NETSTAT_ENTRY(tx_dropped);
371NETSTAT_ENTRY(multicast);
372NETSTAT_ENTRY(collisions);
373NETSTAT_ENTRY(rx_length_errors);
374NETSTAT_ENTRY(rx_over_errors);
375NETSTAT_ENTRY(rx_crc_errors);
376NETSTAT_ENTRY(rx_frame_errors);
377NETSTAT_ENTRY(rx_fifo_errors);
378NETSTAT_ENTRY(rx_missed_errors);
379NETSTAT_ENTRY(tx_aborted_errors);
380NETSTAT_ENTRY(tx_carrier_errors);
381NETSTAT_ENTRY(tx_fifo_errors);
382NETSTAT_ENTRY(tx_heartbeat_errors);
383NETSTAT_ENTRY(tx_window_errors);
384NETSTAT_ENTRY(rx_compressed);
385NETSTAT_ENTRY(tx_compressed);
386
387static struct attribute *netstat_attrs[] = {
388 &dev_attr_rx_packets.attr,
389 &dev_attr_tx_packets.attr,
390 &dev_attr_rx_bytes.attr,
391 &dev_attr_tx_bytes.attr,
392 &dev_attr_rx_errors.attr,
393 &dev_attr_tx_errors.attr,
394 &dev_attr_rx_dropped.attr,
395 &dev_attr_tx_dropped.attr,
396 &dev_attr_multicast.attr,
397 &dev_attr_collisions.attr,
398 &dev_attr_rx_length_errors.attr,
399 &dev_attr_rx_over_errors.attr,
400 &dev_attr_rx_crc_errors.attr,
401 &dev_attr_rx_frame_errors.attr,
402 &dev_attr_rx_fifo_errors.attr,
403 &dev_attr_rx_missed_errors.attr,
404 &dev_attr_tx_aborted_errors.attr,
405 &dev_attr_tx_carrier_errors.attr,
406 &dev_attr_tx_fifo_errors.attr,
407 &dev_attr_tx_heartbeat_errors.attr,
408 &dev_attr_tx_window_errors.attr,
409 &dev_attr_rx_compressed.attr,
410 &dev_attr_tx_compressed.attr,
411 NULL
412};
413
414
415static struct attribute_group netstat_group = {
416 .name = "statistics",
417 .attrs = netstat_attrs,
418};
419
420#ifdef CONFIG_WIRELESS_EXT_SYSFS
421/* helper function that does all the locking etc for wireless stats */
422static ssize_t wireless_show(struct device *d, char *buf,
423 ssize_t (*format)(const struct iw_statistics *,
424 char *))
425{
426 struct net_device *dev = to_net_dev(d);
427 const struct iw_statistics *iw;
428 ssize_t ret = -EINVAL;
429
430 if (!rtnl_trylock())
431 return restart_syscall();
432 if (dev_isalive(dev)) {
433 iw = get_wireless_stats(dev);
434 if (iw)
435 ret = (*format)(iw, buf);
436 }
437 rtnl_unlock();
438
439 return ret;
440}
441
442/* show function template for wireless fields */
443#define WIRELESS_SHOW(name, field, format_string) \
444static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
445{ \
446 return sprintf(buf, format_string, iw->field); \
447} \
448static ssize_t show_iw_##name(struct device *d, \
449 struct device_attribute *attr, char *buf) \
450{ \
451 return wireless_show(d, buf, format_iw_##name); \
452} \
453static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
454
455WIRELESS_SHOW(status, status, fmt_hex);
456WIRELESS_SHOW(link, qual.qual, fmt_dec);
457WIRELESS_SHOW(level, qual.level, fmt_dec);
458WIRELESS_SHOW(noise, qual.noise, fmt_dec);
459WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
460WIRELESS_SHOW(crypt, discard.code, fmt_dec);
461WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
462WIRELESS_SHOW(misc, discard.misc, fmt_dec);
463WIRELESS_SHOW(retries, discard.retries, fmt_dec);
464WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
465
466static struct attribute *wireless_attrs[] = {
467 &dev_attr_status.attr,
468 &dev_attr_link.attr,
469 &dev_attr_level.attr,
470 &dev_attr_noise.attr,
471 &dev_attr_nwid.attr,
472 &dev_attr_crypt.attr,
473 &dev_attr_fragment.attr,
474 &dev_attr_retries.attr,
475 &dev_attr_misc.attr,
476 &dev_attr_beacon.attr,
477 NULL
478};
479
480static struct attribute_group wireless_group = {
481 .name = "wireless",
482 .attrs = wireless_attrs,
483};
484#endif
485#endif /* CONFIG_SYSFS */
486
487#ifdef CONFIG_RPS
488/*
489 * RX queue sysfs structures and functions.
490 */
491struct rx_queue_attribute {
492 struct attribute attr;
493 ssize_t (*show)(struct netdev_rx_queue *queue,
494 struct rx_queue_attribute *attr, char *buf);
495 ssize_t (*store)(struct netdev_rx_queue *queue,
496 struct rx_queue_attribute *attr, const char *buf, size_t len);
497};
498#define to_rx_queue_attr(_attr) container_of(_attr, \
499 struct rx_queue_attribute, attr)
500
501#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
502
503static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
504 char *buf)
505{
506 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
507 struct netdev_rx_queue *queue = to_rx_queue(kobj);
508
509 if (!attribute->show)
510 return -EIO;
511
512 return attribute->show(queue, attribute, buf);
513}
514
515static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
516 const char *buf, size_t count)
517{
518 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
519 struct netdev_rx_queue *queue = to_rx_queue(kobj);
520
521 if (!attribute->store)
522 return -EIO;
523
524 return attribute->store(queue, attribute, buf, count);
525}
526
527static const struct sysfs_ops rx_queue_sysfs_ops = {
528 .show = rx_queue_attr_show,
529 .store = rx_queue_attr_store,
530};
531
532static ssize_t show_rps_map(struct netdev_rx_queue *queue,
533 struct rx_queue_attribute *attribute, char *buf)
534{
535 struct rps_map *map;
536 cpumask_var_t mask;
537 size_t len = 0;
538 int i;
539
540 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
541 return -ENOMEM;
542
543 rcu_read_lock();
544 map = rcu_dereference(queue->rps_map);
545 if (map)
546 for (i = 0; i < map->len; i++)
547 cpumask_set_cpu(map->cpus[i], mask);
548
549 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
550 if (PAGE_SIZE - len < 3) {
551 rcu_read_unlock();
552 free_cpumask_var(mask);
553 return -EINVAL;
554 }
555 rcu_read_unlock();
556
557 free_cpumask_var(mask);
558 len += sprintf(buf + len, "\n");
559 return len;
560}
561
562static ssize_t store_rps_map(struct netdev_rx_queue *queue,
563 struct rx_queue_attribute *attribute,
564 const char *buf, size_t len)
565{
566 struct rps_map *old_map, *map;
567 cpumask_var_t mask;
568 int err, cpu, i;
569 static DEFINE_SPINLOCK(rps_map_lock);
570
571 if (!capable(CAP_NET_ADMIN))
572 return -EPERM;
573
574 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
575 return -ENOMEM;
576
577 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
578 if (err) {
579 free_cpumask_var(mask);
580 return err;
581 }
582
583 map = kzalloc(max_t(unsigned,
584 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
585 GFP_KERNEL);
586 if (!map) {
587 free_cpumask_var(mask);
588 return -ENOMEM;
589 }
590
591 i = 0;
592 for_each_cpu_and(cpu, mask, cpu_online_mask)
593 map->cpus[i++] = cpu;
594
595 if (i)
596 map->len = i;
597 else {
598 kfree(map);
599 map = NULL;
600 }
601
602 spin_lock(&rps_map_lock);
603 old_map = rcu_dereference_protected(queue->rps_map,
604 lockdep_is_held(&rps_map_lock));
605 rcu_assign_pointer(queue->rps_map, map);
606 spin_unlock(&rps_map_lock);
607
608 if (old_map)
609 kfree_rcu(old_map, rcu);
610
611 free_cpumask_var(mask);
612 return len;
613}
614
615static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
616 struct rx_queue_attribute *attr,
617 char *buf)
618{
619 struct rps_dev_flow_table *flow_table;
620 unsigned int val = 0;
621
622 rcu_read_lock();
623 flow_table = rcu_dereference(queue->rps_flow_table);
624 if (flow_table)
625 val = flow_table->mask + 1;
626 rcu_read_unlock();
627
628 return sprintf(buf, "%u\n", val);
629}
630
631static void rps_dev_flow_table_release_work(struct work_struct *work)
632{
633 struct rps_dev_flow_table *table = container_of(work,
634 struct rps_dev_flow_table, free_work);
635
636 vfree(table);
637}
638
639static void rps_dev_flow_table_release(struct rcu_head *rcu)
640{
641 struct rps_dev_flow_table *table = container_of(rcu,
642 struct rps_dev_flow_table, rcu);
643
644 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
645 schedule_work(&table->free_work);
646}
647
648static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
649 struct rx_queue_attribute *attr,
650 const char *buf, size_t len)
651{
652 unsigned int count;
653 char *endp;
654 struct rps_dev_flow_table *table, *old_table;
655 static DEFINE_SPINLOCK(rps_dev_flow_lock);
656
657 if (!capable(CAP_NET_ADMIN))
658 return -EPERM;
659
660 count = simple_strtoul(buf, &endp, 0);
661 if (endp == buf)
662 return -EINVAL;
663
664 if (count) {
665 int i;
666
667 if (count > 1<<30) {
668 /* Enforce a limit to prevent overflow */
669 return -EINVAL;
670 }
671 count = roundup_pow_of_two(count);
672 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
673 if (!table)
674 return -ENOMEM;
675
676 table->mask = count - 1;
677 for (i = 0; i < count; i++)
678 table->flows[i].cpu = RPS_NO_CPU;
679 } else
680 table = NULL;
681
682 spin_lock(&rps_dev_flow_lock);
683 old_table = rcu_dereference_protected(queue->rps_flow_table,
684 lockdep_is_held(&rps_dev_flow_lock));
685 rcu_assign_pointer(queue->rps_flow_table, table);
686 spin_unlock(&rps_dev_flow_lock);
687
688 if (old_table)
689 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
690
691 return len;
692}
693
694static struct rx_queue_attribute rps_cpus_attribute =
695 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
696
697
698static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
699 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
700 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
701
702static struct attribute *rx_queue_default_attrs[] = {
703 &rps_cpus_attribute.attr,
704 &rps_dev_flow_table_cnt_attribute.attr,
705 NULL
706};
707
708static void rx_queue_release(struct kobject *kobj)
709{
710 struct netdev_rx_queue *queue = to_rx_queue(kobj);
711 struct rps_map *map;
712 struct rps_dev_flow_table *flow_table;
713
714
715 map = rcu_dereference_raw(queue->rps_map);
716 if (map) {
717 RCU_INIT_POINTER(queue->rps_map, NULL);
718 kfree_rcu(map, rcu);
719 }
720
721 flow_table = rcu_dereference_raw(queue->rps_flow_table);
722 if (flow_table) {
723 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
724 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
725 }
726
727 memset(kobj, 0, sizeof(*kobj));
728 dev_put(queue->dev);
729}
730
731static struct kobj_type rx_queue_ktype = {
732 .sysfs_ops = &rx_queue_sysfs_ops,
733 .release = rx_queue_release,
734 .default_attrs = rx_queue_default_attrs,
735};
736
737static int rx_queue_add_kobject(struct net_device *net, int index)
738{
739 struct netdev_rx_queue *queue = net->_rx + index;
740 struct kobject *kobj = &queue->kobj;
741 int error = 0;
742
743 kobj->kset = net->queues_kset;
744 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
745 "rx-%u", index);
746 if (error) {
747 kobject_put(kobj);
748 return error;
749 }
750
751 kobject_uevent(kobj, KOBJ_ADD);
752 dev_hold(queue->dev);
753
754 return error;
755}
756#endif /* CONFIG_RPS */
757
758int
759net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
760{
761#ifdef CONFIG_RPS
762 int i;
763 int error = 0;
764
765 for (i = old_num; i < new_num; i++) {
766 error = rx_queue_add_kobject(net, i);
767 if (error) {
768 new_num = old_num;
769 break;
770 }
771 }
772
773 while (--i >= new_num)
774 kobject_put(&net->_rx[i].kobj);
775
776 return error;
777#else
778 return 0;
779#endif
780}
781
782#ifdef CONFIG_XPS
783/*
784 * netdev_queue sysfs structures and functions.
785 */
786struct netdev_queue_attribute {
787 struct attribute attr;
788 ssize_t (*show)(struct netdev_queue *queue,
789 struct netdev_queue_attribute *attr, char *buf);
790 ssize_t (*store)(struct netdev_queue *queue,
791 struct netdev_queue_attribute *attr, const char *buf, size_t len);
792};
793#define to_netdev_queue_attr(_attr) container_of(_attr, \
794 struct netdev_queue_attribute, attr)
795
796#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
797
798static ssize_t netdev_queue_attr_show(struct kobject *kobj,
799 struct attribute *attr, char *buf)
800{
801 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
802 struct netdev_queue *queue = to_netdev_queue(kobj);
803
804 if (!attribute->show)
805 return -EIO;
806
807 return attribute->show(queue, attribute, buf);
808}
809
810static ssize_t netdev_queue_attr_store(struct kobject *kobj,
811 struct attribute *attr,
812 const char *buf, size_t count)
813{
814 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
815 struct netdev_queue *queue = to_netdev_queue(kobj);
816
817 if (!attribute->store)
818 return -EIO;
819
820 return attribute->store(queue, attribute, buf, count);
821}
822
823static const struct sysfs_ops netdev_queue_sysfs_ops = {
824 .show = netdev_queue_attr_show,
825 .store = netdev_queue_attr_store,
826};
827
828static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
829{
830 struct net_device *dev = queue->dev;
831 int i;
832
833 for (i = 0; i < dev->num_tx_queues; i++)
834 if (queue == &dev->_tx[i])
835 break;
836
837 BUG_ON(i >= dev->num_tx_queues);
838
839 return i;
840}
841
842
843static ssize_t show_xps_map(struct netdev_queue *queue,
844 struct netdev_queue_attribute *attribute, char *buf)
845{
846 struct net_device *dev = queue->dev;
847 struct xps_dev_maps *dev_maps;
848 cpumask_var_t mask;
849 unsigned long index;
850 size_t len = 0;
851 int i;
852
853 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
854 return -ENOMEM;
855
856 index = get_netdev_queue_index(queue);
857
858 rcu_read_lock();
859 dev_maps = rcu_dereference(dev->xps_maps);
860 if (dev_maps) {
861 for_each_possible_cpu(i) {
862 struct xps_map *map =
863 rcu_dereference(dev_maps->cpu_map[i]);
864 if (map) {
865 int j;
866 for (j = 0; j < map->len; j++) {
867 if (map->queues[j] == index) {
868 cpumask_set_cpu(i, mask);
869 break;
870 }
871 }
872 }
873 }
874 }
875 rcu_read_unlock();
876
877 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
878 if (PAGE_SIZE - len < 3) {
879 free_cpumask_var(mask);
880 return -EINVAL;
881 }
882
883 free_cpumask_var(mask);
884 len += sprintf(buf + len, "\n");
885 return len;
886}
887
888static DEFINE_MUTEX(xps_map_mutex);
889#define xmap_dereference(P) \
890 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
891
892static ssize_t store_xps_map(struct netdev_queue *queue,
893 struct netdev_queue_attribute *attribute,
894 const char *buf, size_t len)
895{
896 struct net_device *dev = queue->dev;
897 cpumask_var_t mask;
898 int err, i, cpu, pos, map_len, alloc_len, need_set;
899 unsigned long index;
900 struct xps_map *map, *new_map;
901 struct xps_dev_maps *dev_maps, *new_dev_maps;
902 int nonempty = 0;
903 int numa_node = -2;
904
905 if (!capable(CAP_NET_ADMIN))
906 return -EPERM;
907
908 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
909 return -ENOMEM;
910
911 index = get_netdev_queue_index(queue);
912
913 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
914 if (err) {
915 free_cpumask_var(mask);
916 return err;
917 }
918
919 new_dev_maps = kzalloc(max_t(unsigned,
920 XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
921 if (!new_dev_maps) {
922 free_cpumask_var(mask);
923 return -ENOMEM;
924 }
925
926 mutex_lock(&xps_map_mutex);
927
928 dev_maps = xmap_dereference(dev->xps_maps);
929
930 for_each_possible_cpu(cpu) {
931 map = dev_maps ?
932 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
933 new_map = map;
934 if (map) {
935 for (pos = 0; pos < map->len; pos++)
936 if (map->queues[pos] == index)
937 break;
938 map_len = map->len;
939 alloc_len = map->alloc_len;
940 } else
941 pos = map_len = alloc_len = 0;
942
943 need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu);
944#ifdef CONFIG_NUMA
945 if (need_set) {
946 if (numa_node == -2)
947 numa_node = cpu_to_node(cpu);
948 else if (numa_node != cpu_to_node(cpu))
949 numa_node = -1;
950 }
951#endif
952 if (need_set && pos >= map_len) {
953 /* Need to add queue to this CPU's map */
954 if (map_len >= alloc_len) {
955 alloc_len = alloc_len ?
956 2 * alloc_len : XPS_MIN_MAP_ALLOC;
957 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
958 GFP_KERNEL,
959 cpu_to_node(cpu));
960 if (!new_map)
961 goto error;
962 new_map->alloc_len = alloc_len;
963 for (i = 0; i < map_len; i++)
964 new_map->queues[i] = map->queues[i];
965 new_map->len = map_len;
966 }
967 new_map->queues[new_map->len++] = index;
968 } else if (!need_set && pos < map_len) {
969 /* Need to remove queue from this CPU's map */
970 if (map_len > 1)
971 new_map->queues[pos] =
972 new_map->queues[--new_map->len];
973 else
974 new_map = NULL;
975 }
976 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
977 }
978
979 /* Cleanup old maps */
980 for_each_possible_cpu(cpu) {
981 map = dev_maps ?
982 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
983 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
984 kfree_rcu(map, rcu);
985 if (new_dev_maps->cpu_map[cpu])
986 nonempty = 1;
987 }
988
989 if (nonempty)
990 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
991 else {
992 kfree(new_dev_maps);
993 rcu_assign_pointer(dev->xps_maps, NULL);
994 }
995
996 if (dev_maps)
997 kfree_rcu(dev_maps, rcu);
998
999 netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node :
1000 NUMA_NO_NODE);
1001
1002 mutex_unlock(&xps_map_mutex);
1003
1004 free_cpumask_var(mask);
1005 return len;
1006
1007error:
1008 mutex_unlock(&xps_map_mutex);
1009
1010 if (new_dev_maps)
1011 for_each_possible_cpu(i)
1012 kfree(rcu_dereference_protected(
1013 new_dev_maps->cpu_map[i],
1014 1));
1015 kfree(new_dev_maps);
1016 free_cpumask_var(mask);
1017 return -ENOMEM;
1018}
1019
1020static struct netdev_queue_attribute xps_cpus_attribute =
1021 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1022
1023static struct attribute *netdev_queue_default_attrs[] = {
1024 &xps_cpus_attribute.attr,
1025 NULL
1026};
1027
1028static void netdev_queue_release(struct kobject *kobj)
1029{
1030 struct netdev_queue *queue = to_netdev_queue(kobj);
1031 struct net_device *dev = queue->dev;
1032 struct xps_dev_maps *dev_maps;
1033 struct xps_map *map;
1034 unsigned long index;
1035 int i, pos, nonempty = 0;
1036
1037 index = get_netdev_queue_index(queue);
1038
1039 mutex_lock(&xps_map_mutex);
1040 dev_maps = xmap_dereference(dev->xps_maps);
1041
1042 if (dev_maps) {
1043 for_each_possible_cpu(i) {
1044 map = xmap_dereference(dev_maps->cpu_map[i]);
1045 if (!map)
1046 continue;
1047
1048 for (pos = 0; pos < map->len; pos++)
1049 if (map->queues[pos] == index)
1050 break;
1051
1052 if (pos < map->len) {
1053 if (map->len > 1)
1054 map->queues[pos] =
1055 map->queues[--map->len];
1056 else {
1057 RCU_INIT_POINTER(dev_maps->cpu_map[i],
1058 NULL);
1059 kfree_rcu(map, rcu);
1060 map = NULL;
1061 }
1062 }
1063 if (map)
1064 nonempty = 1;
1065 }
1066
1067 if (!nonempty) {
1068 RCU_INIT_POINTER(dev->xps_maps, NULL);
1069 kfree_rcu(dev_maps, rcu);
1070 }
1071 }
1072
1073 mutex_unlock(&xps_map_mutex);
1074
1075 memset(kobj, 0, sizeof(*kobj));
1076 dev_put(queue->dev);
1077}
1078
1079static struct kobj_type netdev_queue_ktype = {
1080 .sysfs_ops = &netdev_queue_sysfs_ops,
1081 .release = netdev_queue_release,
1082 .default_attrs = netdev_queue_default_attrs,
1083};
1084
1085static int netdev_queue_add_kobject(struct net_device *net, int index)
1086{
1087 struct netdev_queue *queue = net->_tx + index;
1088 struct kobject *kobj = &queue->kobj;
1089 int error = 0;
1090
1091 kobj->kset = net->queues_kset;
1092 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1093 "tx-%u", index);
1094 if (error) {
1095 kobject_put(kobj);
1096 return error;
1097 }
1098
1099 kobject_uevent(kobj, KOBJ_ADD);
1100 dev_hold(queue->dev);
1101
1102 return error;
1103}
1104#endif /* CONFIG_XPS */
1105
1106int
1107netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1108{
1109#ifdef CONFIG_XPS
1110 int i;
1111 int error = 0;
1112
1113 for (i = old_num; i < new_num; i++) {
1114 error = netdev_queue_add_kobject(net, i);
1115 if (error) {
1116 new_num = old_num;
1117 break;
1118 }
1119 }
1120
1121 while (--i >= new_num)
1122 kobject_put(&net->_tx[i].kobj);
1123
1124 return error;
1125#else
1126 return 0;
1127#endif
1128}
1129
1130static int register_queue_kobjects(struct net_device *net)
1131{
1132 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1133
1134#if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1135 net->queues_kset = kset_create_and_add("queues",
1136 NULL, &net->dev.kobj);
1137 if (!net->queues_kset)
1138 return -ENOMEM;
1139#endif
1140
1141#ifdef CONFIG_RPS
1142 real_rx = net->real_num_rx_queues;
1143#endif
1144 real_tx = net->real_num_tx_queues;
1145
1146 error = net_rx_queue_update_kobjects(net, 0, real_rx);
1147 if (error)
1148 goto error;
1149 rxq = real_rx;
1150
1151 error = netdev_queue_update_kobjects(net, 0, real_tx);
1152 if (error)
1153 goto error;
1154 txq = real_tx;
1155
1156 return 0;
1157
1158error:
1159 netdev_queue_update_kobjects(net, txq, 0);
1160 net_rx_queue_update_kobjects(net, rxq, 0);
1161 return error;
1162}
1163
1164static void remove_queue_kobjects(struct net_device *net)
1165{
1166 int real_rx = 0, real_tx = 0;
1167
1168#ifdef CONFIG_RPS
1169 real_rx = net->real_num_rx_queues;
1170#endif
1171 real_tx = net->real_num_tx_queues;
1172
1173 net_rx_queue_update_kobjects(net, real_rx, 0);
1174 netdev_queue_update_kobjects(net, real_tx, 0);
1175#if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1176 kset_unregister(net->queues_kset);
1177#endif
1178}
1179
1180static void *net_grab_current_ns(void)
1181{
1182 struct net *ns = current->nsproxy->net_ns;
1183#ifdef CONFIG_NET_NS
1184 if (ns)
1185 atomic_inc(&ns->passive);
1186#endif
1187 return ns;
1188}
1189
1190static const void *net_initial_ns(void)
1191{
1192 return &init_net;
1193}
1194
1195static const void *net_netlink_ns(struct sock *sk)
1196{
1197 return sock_net(sk);
1198}
1199
1200struct kobj_ns_type_operations net_ns_type_operations = {
1201 .type = KOBJ_NS_TYPE_NET,
1202 .grab_current_ns = net_grab_current_ns,
1203 .netlink_ns = net_netlink_ns,
1204 .initial_ns = net_initial_ns,
1205 .drop_ns = net_drop_ns,
1206};
1207EXPORT_SYMBOL_GPL(net_ns_type_operations);
1208
1209#ifdef CONFIG_HOTPLUG
1210static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1211{
1212 struct net_device *dev = to_net_dev(d);
1213 int retval;
1214
1215 /* pass interface to uevent. */
1216 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1217 if (retval)
1218 goto exit;
1219
1220 /* pass ifindex to uevent.
1221 * ifindex is useful as it won't change (interface name may change)
1222 * and is what RtNetlink uses natively. */
1223 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1224
1225exit:
1226 return retval;
1227}
1228#endif
1229
1230/*
1231 * netdev_release -- destroy and free a dead device.
1232 * Called when last reference to device kobject is gone.
1233 */
1234static void netdev_release(struct device *d)
1235{
1236 struct net_device *dev = to_net_dev(d);
1237
1238 BUG_ON(dev->reg_state != NETREG_RELEASED);
1239
1240 kfree(dev->ifalias);
1241 kfree((char *)dev - dev->padded);
1242}
1243
1244static const void *net_namespace(struct device *d)
1245{
1246 struct net_device *dev;
1247 dev = container_of(d, struct net_device, dev);
1248 return dev_net(dev);
1249}
1250
1251static struct class net_class = {
1252 .name = "net",
1253 .dev_release = netdev_release,
1254#ifdef CONFIG_SYSFS
1255 .dev_attrs = net_class_attributes,
1256#endif /* CONFIG_SYSFS */
1257#ifdef CONFIG_HOTPLUG
1258 .dev_uevent = netdev_uevent,
1259#endif
1260 .ns_type = &net_ns_type_operations,
1261 .namespace = net_namespace,
1262};
1263
1264/* Delete sysfs entries but hold kobject reference until after all
1265 * netdev references are gone.
1266 */
1267void netdev_unregister_kobject(struct net_device * net)
1268{
1269 struct device *dev = &(net->dev);
1270
1271 kobject_get(&dev->kobj);
1272
1273 remove_queue_kobjects(net);
1274
1275 device_del(dev);
1276}
1277
1278/* Create sysfs entries for network device. */
1279int netdev_register_kobject(struct net_device *net)
1280{
1281 struct device *dev = &(net->dev);
1282 const struct attribute_group **groups = net->sysfs_groups;
1283 int error = 0;
1284
1285 device_initialize(dev);
1286 dev->class = &net_class;
1287 dev->platform_data = net;
1288 dev->groups = groups;
1289
1290 dev_set_name(dev, "%s", net->name);
1291
1292#ifdef CONFIG_SYSFS
1293 /* Allow for a device specific group */
1294 if (*groups)
1295 groups++;
1296
1297 *groups++ = &netstat_group;
1298#ifdef CONFIG_WIRELESS_EXT_SYSFS
1299 if (net->ieee80211_ptr)
1300 *groups++ = &wireless_group;
1301#ifdef CONFIG_WIRELESS_EXT
1302 else if (net->wireless_handlers)
1303 *groups++ = &wireless_group;
1304#endif
1305#endif
1306#endif /* CONFIG_SYSFS */
1307
1308 error = device_add(dev);
1309 if (error)
1310 return error;
1311
1312 error = register_queue_kobjects(net);
1313 if (error) {
1314 device_del(dev);
1315 return error;
1316 }
1317
1318 return error;
1319}
1320
1321int netdev_class_create_file(struct class_attribute *class_attr)
1322{
1323 return class_create_file(&net_class, class_attr);
1324}
1325EXPORT_SYMBOL(netdev_class_create_file);
1326
1327void netdev_class_remove_file(struct class_attribute *class_attr)
1328{
1329 class_remove_file(&net_class, class_attr);
1330}
1331EXPORT_SYMBOL(netdev_class_remove_file);
1332
1333int netdev_kobject_init(void)
1334{
1335 kobj_ns_type_register(&net_ns_type_operations);
1336 return class_register(&net_class);
1337}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net-sysfs.c - network device class and attributes
4 *
5 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
6 */
7
8#include <linux/capability.h>
9#include <linux/kernel.h>
10#include <linux/netdevice.h>
11#include <linux/if_arp.h>
12#include <linux/slab.h>
13#include <linux/sched/signal.h>
14#include <linux/nsproxy.h>
15#include <net/sock.h>
16#include <net/net_namespace.h>
17#include <linux/rtnetlink.h>
18#include <linux/vmalloc.h>
19#include <linux/export.h>
20#include <linux/jiffies.h>
21#include <linux/pm_runtime.h>
22#include <linux/of.h>
23#include <linux/of_net.h>
24#include <linux/cpu.h>
25
26#include "net-sysfs.h"
27
28#ifdef CONFIG_SYSFS
29static const char fmt_hex[] = "%#x\n";
30static const char fmt_dec[] = "%d\n";
31static const char fmt_ulong[] = "%lu\n";
32static const char fmt_u64[] = "%llu\n";
33
34static inline int dev_isalive(const struct net_device *dev)
35{
36 return dev->reg_state <= NETREG_REGISTERED;
37}
38
39/* use same locking rules as GIF* ioctl's */
40static ssize_t netdev_show(const struct device *dev,
41 struct device_attribute *attr, char *buf,
42 ssize_t (*format)(const struct net_device *, char *))
43{
44 struct net_device *ndev = to_net_dev(dev);
45 ssize_t ret = -EINVAL;
46
47 read_lock(&dev_base_lock);
48 if (dev_isalive(ndev))
49 ret = (*format)(ndev, buf);
50 read_unlock(&dev_base_lock);
51
52 return ret;
53}
54
55/* generate a show function for simple field */
56#define NETDEVICE_SHOW(field, format_string) \
57static ssize_t format_##field(const struct net_device *dev, char *buf) \
58{ \
59 return sprintf(buf, format_string, dev->field); \
60} \
61static ssize_t field##_show(struct device *dev, \
62 struct device_attribute *attr, char *buf) \
63{ \
64 return netdev_show(dev, attr, buf, format_##field); \
65} \
66
67#define NETDEVICE_SHOW_RO(field, format_string) \
68NETDEVICE_SHOW(field, format_string); \
69static DEVICE_ATTR_RO(field)
70
71#define NETDEVICE_SHOW_RW(field, format_string) \
72NETDEVICE_SHOW(field, format_string); \
73static DEVICE_ATTR_RW(field)
74
75/* use same locking and permission rules as SIF* ioctl's */
76static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
77 const char *buf, size_t len,
78 int (*set)(struct net_device *, unsigned long))
79{
80 struct net_device *netdev = to_net_dev(dev);
81 struct net *net = dev_net(netdev);
82 unsigned long new;
83 int ret = -EINVAL;
84
85 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
86 return -EPERM;
87
88 ret = kstrtoul(buf, 0, &new);
89 if (ret)
90 goto err;
91
92 if (!rtnl_trylock())
93 return restart_syscall();
94
95 if (dev_isalive(netdev)) {
96 ret = (*set)(netdev, new);
97 if (ret == 0)
98 ret = len;
99 }
100 rtnl_unlock();
101 err:
102 return ret;
103}
104
105NETDEVICE_SHOW_RO(dev_id, fmt_hex);
106NETDEVICE_SHOW_RO(dev_port, fmt_dec);
107NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
108NETDEVICE_SHOW_RO(addr_len, fmt_dec);
109NETDEVICE_SHOW_RO(ifindex, fmt_dec);
110NETDEVICE_SHOW_RO(type, fmt_dec);
111NETDEVICE_SHOW_RO(link_mode, fmt_dec);
112
113static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
114 char *buf)
115{
116 struct net_device *ndev = to_net_dev(dev);
117
118 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
119}
120static DEVICE_ATTR_RO(iflink);
121
122static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
123{
124 return sprintf(buf, fmt_dec, dev->name_assign_type);
125}
126
127static ssize_t name_assign_type_show(struct device *dev,
128 struct device_attribute *attr,
129 char *buf)
130{
131 struct net_device *ndev = to_net_dev(dev);
132 ssize_t ret = -EINVAL;
133
134 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
135 ret = netdev_show(dev, attr, buf, format_name_assign_type);
136
137 return ret;
138}
139static DEVICE_ATTR_RO(name_assign_type);
140
141/* use same locking rules as GIFHWADDR ioctl's */
142static ssize_t address_show(struct device *dev, struct device_attribute *attr,
143 char *buf)
144{
145 struct net_device *ndev = to_net_dev(dev);
146 ssize_t ret = -EINVAL;
147
148 read_lock(&dev_base_lock);
149 if (dev_isalive(ndev))
150 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
151 read_unlock(&dev_base_lock);
152 return ret;
153}
154static DEVICE_ATTR_RO(address);
155
156static ssize_t broadcast_show(struct device *dev,
157 struct device_attribute *attr, char *buf)
158{
159 struct net_device *ndev = to_net_dev(dev);
160
161 if (dev_isalive(ndev))
162 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
163 return -EINVAL;
164}
165static DEVICE_ATTR_RO(broadcast);
166
167static int change_carrier(struct net_device *dev, unsigned long new_carrier)
168{
169 if (!netif_running(dev))
170 return -EINVAL;
171 return dev_change_carrier(dev, (bool)new_carrier);
172}
173
174static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
175 const char *buf, size_t len)
176{
177 return netdev_store(dev, attr, buf, len, change_carrier);
178}
179
180static ssize_t carrier_show(struct device *dev,
181 struct device_attribute *attr, char *buf)
182{
183 struct net_device *netdev = to_net_dev(dev);
184
185 if (netif_running(netdev))
186 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
187
188 return -EINVAL;
189}
190static DEVICE_ATTR_RW(carrier);
191
192static ssize_t speed_show(struct device *dev,
193 struct device_attribute *attr, char *buf)
194{
195 struct net_device *netdev = to_net_dev(dev);
196 int ret = -EINVAL;
197
198 if (!rtnl_trylock())
199 return restart_syscall();
200
201 if (netif_running(netdev)) {
202 struct ethtool_link_ksettings cmd;
203
204 if (!__ethtool_get_link_ksettings(netdev, &cmd))
205 ret = sprintf(buf, fmt_dec, cmd.base.speed);
206 }
207 rtnl_unlock();
208 return ret;
209}
210static DEVICE_ATTR_RO(speed);
211
212static ssize_t duplex_show(struct device *dev,
213 struct device_attribute *attr, char *buf)
214{
215 struct net_device *netdev = to_net_dev(dev);
216 int ret = -EINVAL;
217
218 if (!rtnl_trylock())
219 return restart_syscall();
220
221 if (netif_running(netdev)) {
222 struct ethtool_link_ksettings cmd;
223
224 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
225 const char *duplex;
226
227 switch (cmd.base.duplex) {
228 case DUPLEX_HALF:
229 duplex = "half";
230 break;
231 case DUPLEX_FULL:
232 duplex = "full";
233 break;
234 default:
235 duplex = "unknown";
236 break;
237 }
238 ret = sprintf(buf, "%s\n", duplex);
239 }
240 }
241 rtnl_unlock();
242 return ret;
243}
244static DEVICE_ATTR_RO(duplex);
245
246static ssize_t dormant_show(struct device *dev,
247 struct device_attribute *attr, char *buf)
248{
249 struct net_device *netdev = to_net_dev(dev);
250
251 if (netif_running(netdev))
252 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
253
254 return -EINVAL;
255}
256static DEVICE_ATTR_RO(dormant);
257
258static const char *const operstates[] = {
259 "unknown",
260 "notpresent", /* currently unused */
261 "down",
262 "lowerlayerdown",
263 "testing", /* currently unused */
264 "dormant",
265 "up"
266};
267
268static ssize_t operstate_show(struct device *dev,
269 struct device_attribute *attr, char *buf)
270{
271 const struct net_device *netdev = to_net_dev(dev);
272 unsigned char operstate;
273
274 read_lock(&dev_base_lock);
275 operstate = netdev->operstate;
276 if (!netif_running(netdev))
277 operstate = IF_OPER_DOWN;
278 read_unlock(&dev_base_lock);
279
280 if (operstate >= ARRAY_SIZE(operstates))
281 return -EINVAL; /* should not happen */
282
283 return sprintf(buf, "%s\n", operstates[operstate]);
284}
285static DEVICE_ATTR_RO(operstate);
286
287static ssize_t carrier_changes_show(struct device *dev,
288 struct device_attribute *attr,
289 char *buf)
290{
291 struct net_device *netdev = to_net_dev(dev);
292
293 return sprintf(buf, fmt_dec,
294 atomic_read(&netdev->carrier_up_count) +
295 atomic_read(&netdev->carrier_down_count));
296}
297static DEVICE_ATTR_RO(carrier_changes);
298
299static ssize_t carrier_up_count_show(struct device *dev,
300 struct device_attribute *attr,
301 char *buf)
302{
303 struct net_device *netdev = to_net_dev(dev);
304
305 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
306}
307static DEVICE_ATTR_RO(carrier_up_count);
308
309static ssize_t carrier_down_count_show(struct device *dev,
310 struct device_attribute *attr,
311 char *buf)
312{
313 struct net_device *netdev = to_net_dev(dev);
314
315 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
316}
317static DEVICE_ATTR_RO(carrier_down_count);
318
319/* read-write attributes */
320
321static int change_mtu(struct net_device *dev, unsigned long new_mtu)
322{
323 return dev_set_mtu(dev, (int)new_mtu);
324}
325
326static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
327 const char *buf, size_t len)
328{
329 return netdev_store(dev, attr, buf, len, change_mtu);
330}
331NETDEVICE_SHOW_RW(mtu, fmt_dec);
332
333static int change_flags(struct net_device *dev, unsigned long new_flags)
334{
335 return dev_change_flags(dev, (unsigned int)new_flags, NULL);
336}
337
338static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
339 const char *buf, size_t len)
340{
341 return netdev_store(dev, attr, buf, len, change_flags);
342}
343NETDEVICE_SHOW_RW(flags, fmt_hex);
344
345static ssize_t tx_queue_len_store(struct device *dev,
346 struct device_attribute *attr,
347 const char *buf, size_t len)
348{
349 if (!capable(CAP_NET_ADMIN))
350 return -EPERM;
351
352 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
353}
354NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
355
356static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
357{
358 dev->gro_flush_timeout = val;
359 return 0;
360}
361
362static ssize_t gro_flush_timeout_store(struct device *dev,
363 struct device_attribute *attr,
364 const char *buf, size_t len)
365{
366 if (!capable(CAP_NET_ADMIN))
367 return -EPERM;
368
369 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
370}
371NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
372
373static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
374 const char *buf, size_t len)
375{
376 struct net_device *netdev = to_net_dev(dev);
377 struct net *net = dev_net(netdev);
378 size_t count = len;
379 ssize_t ret = 0;
380
381 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
382 return -EPERM;
383
384 /* ignore trailing newline */
385 if (len > 0 && buf[len - 1] == '\n')
386 --count;
387
388 if (!rtnl_trylock())
389 return restart_syscall();
390
391 if (dev_isalive(netdev)) {
392 ret = dev_set_alias(netdev, buf, count);
393 if (ret < 0)
394 goto err;
395 ret = len;
396 netdev_state_change(netdev);
397 }
398err:
399 rtnl_unlock();
400
401 return ret;
402}
403
404static ssize_t ifalias_show(struct device *dev,
405 struct device_attribute *attr, char *buf)
406{
407 const struct net_device *netdev = to_net_dev(dev);
408 char tmp[IFALIASZ];
409 ssize_t ret = 0;
410
411 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
412 if (ret > 0)
413 ret = sprintf(buf, "%s\n", tmp);
414 return ret;
415}
416static DEVICE_ATTR_RW(ifalias);
417
418static int change_group(struct net_device *dev, unsigned long new_group)
419{
420 dev_set_group(dev, (int)new_group);
421 return 0;
422}
423
424static ssize_t group_store(struct device *dev, struct device_attribute *attr,
425 const char *buf, size_t len)
426{
427 return netdev_store(dev, attr, buf, len, change_group);
428}
429NETDEVICE_SHOW(group, fmt_dec);
430static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
431
432static int change_proto_down(struct net_device *dev, unsigned long proto_down)
433{
434 return dev_change_proto_down(dev, (bool)proto_down);
435}
436
437static ssize_t proto_down_store(struct device *dev,
438 struct device_attribute *attr,
439 const char *buf, size_t len)
440{
441 return netdev_store(dev, attr, buf, len, change_proto_down);
442}
443NETDEVICE_SHOW_RW(proto_down, fmt_dec);
444
445static ssize_t phys_port_id_show(struct device *dev,
446 struct device_attribute *attr, char *buf)
447{
448 struct net_device *netdev = to_net_dev(dev);
449 ssize_t ret = -EINVAL;
450
451 if (!rtnl_trylock())
452 return restart_syscall();
453
454 if (dev_isalive(netdev)) {
455 struct netdev_phys_item_id ppid;
456
457 ret = dev_get_phys_port_id(netdev, &ppid);
458 if (!ret)
459 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
460 }
461 rtnl_unlock();
462
463 return ret;
464}
465static DEVICE_ATTR_RO(phys_port_id);
466
467static ssize_t phys_port_name_show(struct device *dev,
468 struct device_attribute *attr, char *buf)
469{
470 struct net_device *netdev = to_net_dev(dev);
471 ssize_t ret = -EINVAL;
472
473 if (!rtnl_trylock())
474 return restart_syscall();
475
476 if (dev_isalive(netdev)) {
477 char name[IFNAMSIZ];
478
479 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
480 if (!ret)
481 ret = sprintf(buf, "%s\n", name);
482 }
483 rtnl_unlock();
484
485 return ret;
486}
487static DEVICE_ATTR_RO(phys_port_name);
488
489static ssize_t phys_switch_id_show(struct device *dev,
490 struct device_attribute *attr, char *buf)
491{
492 struct net_device *netdev = to_net_dev(dev);
493 ssize_t ret = -EINVAL;
494
495 if (!rtnl_trylock())
496 return restart_syscall();
497
498 if (dev_isalive(netdev)) {
499 struct netdev_phys_item_id ppid = { };
500
501 ret = dev_get_port_parent_id(netdev, &ppid, false);
502 if (!ret)
503 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
504 }
505 rtnl_unlock();
506
507 return ret;
508}
509static DEVICE_ATTR_RO(phys_switch_id);
510
511static struct attribute *net_class_attrs[] __ro_after_init = {
512 &dev_attr_netdev_group.attr,
513 &dev_attr_type.attr,
514 &dev_attr_dev_id.attr,
515 &dev_attr_dev_port.attr,
516 &dev_attr_iflink.attr,
517 &dev_attr_ifindex.attr,
518 &dev_attr_name_assign_type.attr,
519 &dev_attr_addr_assign_type.attr,
520 &dev_attr_addr_len.attr,
521 &dev_attr_link_mode.attr,
522 &dev_attr_address.attr,
523 &dev_attr_broadcast.attr,
524 &dev_attr_speed.attr,
525 &dev_attr_duplex.attr,
526 &dev_attr_dormant.attr,
527 &dev_attr_operstate.attr,
528 &dev_attr_carrier_changes.attr,
529 &dev_attr_ifalias.attr,
530 &dev_attr_carrier.attr,
531 &dev_attr_mtu.attr,
532 &dev_attr_flags.attr,
533 &dev_attr_tx_queue_len.attr,
534 &dev_attr_gro_flush_timeout.attr,
535 &dev_attr_phys_port_id.attr,
536 &dev_attr_phys_port_name.attr,
537 &dev_attr_phys_switch_id.attr,
538 &dev_attr_proto_down.attr,
539 &dev_attr_carrier_up_count.attr,
540 &dev_attr_carrier_down_count.attr,
541 NULL,
542};
543ATTRIBUTE_GROUPS(net_class);
544
545/* Show a given an attribute in the statistics group */
546static ssize_t netstat_show(const struct device *d,
547 struct device_attribute *attr, char *buf,
548 unsigned long offset)
549{
550 struct net_device *dev = to_net_dev(d);
551 ssize_t ret = -EINVAL;
552
553 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
554 offset % sizeof(u64) != 0);
555
556 read_lock(&dev_base_lock);
557 if (dev_isalive(dev)) {
558 struct rtnl_link_stats64 temp;
559 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
560
561 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
562 }
563 read_unlock(&dev_base_lock);
564 return ret;
565}
566
567/* generate a read-only statistics attribute */
568#define NETSTAT_ENTRY(name) \
569static ssize_t name##_show(struct device *d, \
570 struct device_attribute *attr, char *buf) \
571{ \
572 return netstat_show(d, attr, buf, \
573 offsetof(struct rtnl_link_stats64, name)); \
574} \
575static DEVICE_ATTR_RO(name)
576
577NETSTAT_ENTRY(rx_packets);
578NETSTAT_ENTRY(tx_packets);
579NETSTAT_ENTRY(rx_bytes);
580NETSTAT_ENTRY(tx_bytes);
581NETSTAT_ENTRY(rx_errors);
582NETSTAT_ENTRY(tx_errors);
583NETSTAT_ENTRY(rx_dropped);
584NETSTAT_ENTRY(tx_dropped);
585NETSTAT_ENTRY(multicast);
586NETSTAT_ENTRY(collisions);
587NETSTAT_ENTRY(rx_length_errors);
588NETSTAT_ENTRY(rx_over_errors);
589NETSTAT_ENTRY(rx_crc_errors);
590NETSTAT_ENTRY(rx_frame_errors);
591NETSTAT_ENTRY(rx_fifo_errors);
592NETSTAT_ENTRY(rx_missed_errors);
593NETSTAT_ENTRY(tx_aborted_errors);
594NETSTAT_ENTRY(tx_carrier_errors);
595NETSTAT_ENTRY(tx_fifo_errors);
596NETSTAT_ENTRY(tx_heartbeat_errors);
597NETSTAT_ENTRY(tx_window_errors);
598NETSTAT_ENTRY(rx_compressed);
599NETSTAT_ENTRY(tx_compressed);
600NETSTAT_ENTRY(rx_nohandler);
601
602static struct attribute *netstat_attrs[] __ro_after_init = {
603 &dev_attr_rx_packets.attr,
604 &dev_attr_tx_packets.attr,
605 &dev_attr_rx_bytes.attr,
606 &dev_attr_tx_bytes.attr,
607 &dev_attr_rx_errors.attr,
608 &dev_attr_tx_errors.attr,
609 &dev_attr_rx_dropped.attr,
610 &dev_attr_tx_dropped.attr,
611 &dev_attr_multicast.attr,
612 &dev_attr_collisions.attr,
613 &dev_attr_rx_length_errors.attr,
614 &dev_attr_rx_over_errors.attr,
615 &dev_attr_rx_crc_errors.attr,
616 &dev_attr_rx_frame_errors.attr,
617 &dev_attr_rx_fifo_errors.attr,
618 &dev_attr_rx_missed_errors.attr,
619 &dev_attr_tx_aborted_errors.attr,
620 &dev_attr_tx_carrier_errors.attr,
621 &dev_attr_tx_fifo_errors.attr,
622 &dev_attr_tx_heartbeat_errors.attr,
623 &dev_attr_tx_window_errors.attr,
624 &dev_attr_rx_compressed.attr,
625 &dev_attr_tx_compressed.attr,
626 &dev_attr_rx_nohandler.attr,
627 NULL
628};
629
630static const struct attribute_group netstat_group = {
631 .name = "statistics",
632 .attrs = netstat_attrs,
633};
634
635#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
636static struct attribute *wireless_attrs[] = {
637 NULL
638};
639
640static const struct attribute_group wireless_group = {
641 .name = "wireless",
642 .attrs = wireless_attrs,
643};
644#endif
645
646#else /* CONFIG_SYSFS */
647#define net_class_groups NULL
648#endif /* CONFIG_SYSFS */
649
650#ifdef CONFIG_SYSFS
651#define to_rx_queue_attr(_attr) \
652 container_of(_attr, struct rx_queue_attribute, attr)
653
654#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
655
656static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
657 char *buf)
658{
659 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
660 struct netdev_rx_queue *queue = to_rx_queue(kobj);
661
662 if (!attribute->show)
663 return -EIO;
664
665 return attribute->show(queue, buf);
666}
667
668static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
669 const char *buf, size_t count)
670{
671 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
672 struct netdev_rx_queue *queue = to_rx_queue(kobj);
673
674 if (!attribute->store)
675 return -EIO;
676
677 return attribute->store(queue, buf, count);
678}
679
680static const struct sysfs_ops rx_queue_sysfs_ops = {
681 .show = rx_queue_attr_show,
682 .store = rx_queue_attr_store,
683};
684
685#ifdef CONFIG_RPS
686static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
687{
688 struct rps_map *map;
689 cpumask_var_t mask;
690 int i, len;
691
692 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
693 return -ENOMEM;
694
695 rcu_read_lock();
696 map = rcu_dereference(queue->rps_map);
697 if (map)
698 for (i = 0; i < map->len; i++)
699 cpumask_set_cpu(map->cpus[i], mask);
700
701 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
702 rcu_read_unlock();
703 free_cpumask_var(mask);
704
705 return len < PAGE_SIZE ? len : -EINVAL;
706}
707
708static ssize_t store_rps_map(struct netdev_rx_queue *queue,
709 const char *buf, size_t len)
710{
711 struct rps_map *old_map, *map;
712 cpumask_var_t mask;
713 int err, cpu, i;
714 static DEFINE_MUTEX(rps_map_mutex);
715
716 if (!capable(CAP_NET_ADMIN))
717 return -EPERM;
718
719 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
720 return -ENOMEM;
721
722 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
723 if (err) {
724 free_cpumask_var(mask);
725 return err;
726 }
727
728 map = kzalloc(max_t(unsigned int,
729 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
730 GFP_KERNEL);
731 if (!map) {
732 free_cpumask_var(mask);
733 return -ENOMEM;
734 }
735
736 i = 0;
737 for_each_cpu_and(cpu, mask, cpu_online_mask)
738 map->cpus[i++] = cpu;
739
740 if (i) {
741 map->len = i;
742 } else {
743 kfree(map);
744 map = NULL;
745 }
746
747 mutex_lock(&rps_map_mutex);
748 old_map = rcu_dereference_protected(queue->rps_map,
749 mutex_is_locked(&rps_map_mutex));
750 rcu_assign_pointer(queue->rps_map, map);
751
752 if (map)
753 static_branch_inc(&rps_needed);
754 if (old_map)
755 static_branch_dec(&rps_needed);
756
757 mutex_unlock(&rps_map_mutex);
758
759 if (old_map)
760 kfree_rcu(old_map, rcu);
761
762 free_cpumask_var(mask);
763 return len;
764}
765
766static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
767 char *buf)
768{
769 struct rps_dev_flow_table *flow_table;
770 unsigned long val = 0;
771
772 rcu_read_lock();
773 flow_table = rcu_dereference(queue->rps_flow_table);
774 if (flow_table)
775 val = (unsigned long)flow_table->mask + 1;
776 rcu_read_unlock();
777
778 return sprintf(buf, "%lu\n", val);
779}
780
781static void rps_dev_flow_table_release(struct rcu_head *rcu)
782{
783 struct rps_dev_flow_table *table = container_of(rcu,
784 struct rps_dev_flow_table, rcu);
785 vfree(table);
786}
787
788static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
789 const char *buf, size_t len)
790{
791 unsigned long mask, count;
792 struct rps_dev_flow_table *table, *old_table;
793 static DEFINE_SPINLOCK(rps_dev_flow_lock);
794 int rc;
795
796 if (!capable(CAP_NET_ADMIN))
797 return -EPERM;
798
799 rc = kstrtoul(buf, 0, &count);
800 if (rc < 0)
801 return rc;
802
803 if (count) {
804 mask = count - 1;
805 /* mask = roundup_pow_of_two(count) - 1;
806 * without overflows...
807 */
808 while ((mask | (mask >> 1)) != mask)
809 mask |= (mask >> 1);
810 /* On 64 bit arches, must check mask fits in table->mask (u32),
811 * and on 32bit arches, must check
812 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
813 */
814#if BITS_PER_LONG > 32
815 if (mask > (unsigned long)(u32)mask)
816 return -EINVAL;
817#else
818 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
819 / sizeof(struct rps_dev_flow)) {
820 /* Enforce a limit to prevent overflow */
821 return -EINVAL;
822 }
823#endif
824 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
825 if (!table)
826 return -ENOMEM;
827
828 table->mask = mask;
829 for (count = 0; count <= mask; count++)
830 table->flows[count].cpu = RPS_NO_CPU;
831 } else {
832 table = NULL;
833 }
834
835 spin_lock(&rps_dev_flow_lock);
836 old_table = rcu_dereference_protected(queue->rps_flow_table,
837 lockdep_is_held(&rps_dev_flow_lock));
838 rcu_assign_pointer(queue->rps_flow_table, table);
839 spin_unlock(&rps_dev_flow_lock);
840
841 if (old_table)
842 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
843
844 return len;
845}
846
847static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
848 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
849
850static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
851 = __ATTR(rps_flow_cnt, 0644,
852 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
853#endif /* CONFIG_RPS */
854
855static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
856#ifdef CONFIG_RPS
857 &rps_cpus_attribute.attr,
858 &rps_dev_flow_table_cnt_attribute.attr,
859#endif
860 NULL
861};
862ATTRIBUTE_GROUPS(rx_queue_default);
863
864static void rx_queue_release(struct kobject *kobj)
865{
866 struct netdev_rx_queue *queue = to_rx_queue(kobj);
867#ifdef CONFIG_RPS
868 struct rps_map *map;
869 struct rps_dev_flow_table *flow_table;
870
871 map = rcu_dereference_protected(queue->rps_map, 1);
872 if (map) {
873 RCU_INIT_POINTER(queue->rps_map, NULL);
874 kfree_rcu(map, rcu);
875 }
876
877 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
878 if (flow_table) {
879 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
880 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
881 }
882#endif
883
884 memset(kobj, 0, sizeof(*kobj));
885 dev_put(queue->dev);
886}
887
888static const void *rx_queue_namespace(struct kobject *kobj)
889{
890 struct netdev_rx_queue *queue = to_rx_queue(kobj);
891 struct device *dev = &queue->dev->dev;
892 const void *ns = NULL;
893
894 if (dev->class && dev->class->ns_type)
895 ns = dev->class->namespace(dev);
896
897 return ns;
898}
899
900static void rx_queue_get_ownership(struct kobject *kobj,
901 kuid_t *uid, kgid_t *gid)
902{
903 const struct net *net = rx_queue_namespace(kobj);
904
905 net_ns_get_ownership(net, uid, gid);
906}
907
908static struct kobj_type rx_queue_ktype __ro_after_init = {
909 .sysfs_ops = &rx_queue_sysfs_ops,
910 .release = rx_queue_release,
911 .default_groups = rx_queue_default_groups,
912 .namespace = rx_queue_namespace,
913 .get_ownership = rx_queue_get_ownership,
914};
915
916static int rx_queue_add_kobject(struct net_device *dev, int index)
917{
918 struct netdev_rx_queue *queue = dev->_rx + index;
919 struct kobject *kobj = &queue->kobj;
920 int error = 0;
921
922 kobj->kset = dev->queues_kset;
923 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
924 "rx-%u", index);
925 if (error)
926 goto err;
927
928 dev_hold(queue->dev);
929
930 if (dev->sysfs_rx_queue_group) {
931 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
932 if (error)
933 goto err;
934 }
935
936 kobject_uevent(kobj, KOBJ_ADD);
937
938 return error;
939
940err:
941 kobject_put(kobj);
942 return error;
943}
944#endif /* CONFIG_SYSFS */
945
946int
947net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
948{
949#ifdef CONFIG_SYSFS
950 int i;
951 int error = 0;
952
953#ifndef CONFIG_RPS
954 if (!dev->sysfs_rx_queue_group)
955 return 0;
956#endif
957 for (i = old_num; i < new_num; i++) {
958 error = rx_queue_add_kobject(dev, i);
959 if (error) {
960 new_num = old_num;
961 break;
962 }
963 }
964
965 while (--i >= new_num) {
966 struct kobject *kobj = &dev->_rx[i].kobj;
967
968 if (!refcount_read(&dev_net(dev)->count))
969 kobj->uevent_suppress = 1;
970 if (dev->sysfs_rx_queue_group)
971 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
972 kobject_put(kobj);
973 }
974
975 return error;
976#else
977 return 0;
978#endif
979}
980
981#ifdef CONFIG_SYSFS
982/*
983 * netdev_queue sysfs structures and functions.
984 */
985struct netdev_queue_attribute {
986 struct attribute attr;
987 ssize_t (*show)(struct netdev_queue *queue, char *buf);
988 ssize_t (*store)(struct netdev_queue *queue,
989 const char *buf, size_t len);
990};
991#define to_netdev_queue_attr(_attr) \
992 container_of(_attr, struct netdev_queue_attribute, attr)
993
994#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
995
996static ssize_t netdev_queue_attr_show(struct kobject *kobj,
997 struct attribute *attr, char *buf)
998{
999 const struct netdev_queue_attribute *attribute
1000 = to_netdev_queue_attr(attr);
1001 struct netdev_queue *queue = to_netdev_queue(kobj);
1002
1003 if (!attribute->show)
1004 return -EIO;
1005
1006 return attribute->show(queue, buf);
1007}
1008
1009static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1010 struct attribute *attr,
1011 const char *buf, size_t count)
1012{
1013 const struct netdev_queue_attribute *attribute
1014 = to_netdev_queue_attr(attr);
1015 struct netdev_queue *queue = to_netdev_queue(kobj);
1016
1017 if (!attribute->store)
1018 return -EIO;
1019
1020 return attribute->store(queue, buf, count);
1021}
1022
1023static const struct sysfs_ops netdev_queue_sysfs_ops = {
1024 .show = netdev_queue_attr_show,
1025 .store = netdev_queue_attr_store,
1026};
1027
1028static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1029{
1030 unsigned long trans_timeout;
1031
1032 spin_lock_irq(&queue->_xmit_lock);
1033 trans_timeout = queue->trans_timeout;
1034 spin_unlock_irq(&queue->_xmit_lock);
1035
1036 return sprintf(buf, "%lu", trans_timeout);
1037}
1038
1039static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1040{
1041 struct net_device *dev = queue->dev;
1042 unsigned int i;
1043
1044 i = queue - dev->_tx;
1045 BUG_ON(i >= dev->num_tx_queues);
1046
1047 return i;
1048}
1049
1050static ssize_t traffic_class_show(struct netdev_queue *queue,
1051 char *buf)
1052{
1053 struct net_device *dev = queue->dev;
1054 int index;
1055 int tc;
1056
1057 if (!netif_is_multiqueue(dev))
1058 return -ENOENT;
1059
1060 index = get_netdev_queue_index(queue);
1061
1062 /* If queue belongs to subordinate dev use its TC mapping */
1063 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1064
1065 tc = netdev_txq_to_tc(dev, index);
1066 if (tc < 0)
1067 return -EINVAL;
1068
1069 /* We can report the traffic class one of two ways:
1070 * Subordinate device traffic classes are reported with the traffic
1071 * class first, and then the subordinate class so for example TC0 on
1072 * subordinate device 2 will be reported as "0-2". If the queue
1073 * belongs to the root device it will be reported with just the
1074 * traffic class, so just "0" for TC 0 for example.
1075 */
1076 return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1077 sprintf(buf, "%u\n", tc);
1078}
1079
1080#ifdef CONFIG_XPS
1081static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1082 char *buf)
1083{
1084 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1085}
1086
1087static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1088 const char *buf, size_t len)
1089{
1090 struct net_device *dev = queue->dev;
1091 int err, index = get_netdev_queue_index(queue);
1092 u32 rate = 0;
1093
1094 if (!capable(CAP_NET_ADMIN))
1095 return -EPERM;
1096
1097 err = kstrtou32(buf, 10, &rate);
1098 if (err < 0)
1099 return err;
1100
1101 if (!rtnl_trylock())
1102 return restart_syscall();
1103
1104 err = -EOPNOTSUPP;
1105 if (dev->netdev_ops->ndo_set_tx_maxrate)
1106 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1107
1108 rtnl_unlock();
1109 if (!err) {
1110 queue->tx_maxrate = rate;
1111 return len;
1112 }
1113 return err;
1114}
1115
1116static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1117 = __ATTR_RW(tx_maxrate);
1118#endif
1119
1120static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1121 = __ATTR_RO(tx_timeout);
1122
1123static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1124 = __ATTR_RO(traffic_class);
1125
1126#ifdef CONFIG_BQL
1127/*
1128 * Byte queue limits sysfs structures and functions.
1129 */
1130static ssize_t bql_show(char *buf, unsigned int value)
1131{
1132 return sprintf(buf, "%u\n", value);
1133}
1134
1135static ssize_t bql_set(const char *buf, const size_t count,
1136 unsigned int *pvalue)
1137{
1138 unsigned int value;
1139 int err;
1140
1141 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1142 value = DQL_MAX_LIMIT;
1143 } else {
1144 err = kstrtouint(buf, 10, &value);
1145 if (err < 0)
1146 return err;
1147 if (value > DQL_MAX_LIMIT)
1148 return -EINVAL;
1149 }
1150
1151 *pvalue = value;
1152
1153 return count;
1154}
1155
1156static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1157 char *buf)
1158{
1159 struct dql *dql = &queue->dql;
1160
1161 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1162}
1163
1164static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1165 const char *buf, size_t len)
1166{
1167 struct dql *dql = &queue->dql;
1168 unsigned int value;
1169 int err;
1170
1171 err = kstrtouint(buf, 10, &value);
1172 if (err < 0)
1173 return err;
1174
1175 dql->slack_hold_time = msecs_to_jiffies(value);
1176
1177 return len;
1178}
1179
1180static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1181 = __ATTR(hold_time, 0644,
1182 bql_show_hold_time, bql_set_hold_time);
1183
1184static ssize_t bql_show_inflight(struct netdev_queue *queue,
1185 char *buf)
1186{
1187 struct dql *dql = &queue->dql;
1188
1189 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1190}
1191
1192static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1193 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1194
1195#define BQL_ATTR(NAME, FIELD) \
1196static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1197 char *buf) \
1198{ \
1199 return bql_show(buf, queue->dql.FIELD); \
1200} \
1201 \
1202static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1203 const char *buf, size_t len) \
1204{ \
1205 return bql_set(buf, len, &queue->dql.FIELD); \
1206} \
1207 \
1208static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1209 = __ATTR(NAME, 0644, \
1210 bql_show_ ## NAME, bql_set_ ## NAME)
1211
1212BQL_ATTR(limit, limit);
1213BQL_ATTR(limit_max, max_limit);
1214BQL_ATTR(limit_min, min_limit);
1215
1216static struct attribute *dql_attrs[] __ro_after_init = {
1217 &bql_limit_attribute.attr,
1218 &bql_limit_max_attribute.attr,
1219 &bql_limit_min_attribute.attr,
1220 &bql_hold_time_attribute.attr,
1221 &bql_inflight_attribute.attr,
1222 NULL
1223};
1224
1225static const struct attribute_group dql_group = {
1226 .name = "byte_queue_limits",
1227 .attrs = dql_attrs,
1228};
1229#endif /* CONFIG_BQL */
1230
1231#ifdef CONFIG_XPS
1232static ssize_t xps_cpus_show(struct netdev_queue *queue,
1233 char *buf)
1234{
1235 struct net_device *dev = queue->dev;
1236 int cpu, len, num_tc = 1, tc = 0;
1237 struct xps_dev_maps *dev_maps;
1238 cpumask_var_t mask;
1239 unsigned long index;
1240
1241 if (!netif_is_multiqueue(dev))
1242 return -ENOENT;
1243
1244 index = get_netdev_queue_index(queue);
1245
1246 if (dev->num_tc) {
1247 /* Do not allow XPS on subordinate device directly */
1248 num_tc = dev->num_tc;
1249 if (num_tc < 0)
1250 return -EINVAL;
1251
1252 /* If queue belongs to subordinate dev use its map */
1253 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1254
1255 tc = netdev_txq_to_tc(dev, index);
1256 if (tc < 0)
1257 return -EINVAL;
1258 }
1259
1260 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1261 return -ENOMEM;
1262
1263 rcu_read_lock();
1264 dev_maps = rcu_dereference(dev->xps_cpus_map);
1265 if (dev_maps) {
1266 for_each_possible_cpu(cpu) {
1267 int i, tci = cpu * num_tc + tc;
1268 struct xps_map *map;
1269
1270 map = rcu_dereference(dev_maps->attr_map[tci]);
1271 if (!map)
1272 continue;
1273
1274 for (i = map->len; i--;) {
1275 if (map->queues[i] == index) {
1276 cpumask_set_cpu(cpu, mask);
1277 break;
1278 }
1279 }
1280 }
1281 }
1282 rcu_read_unlock();
1283
1284 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1285 free_cpumask_var(mask);
1286 return len < PAGE_SIZE ? len : -EINVAL;
1287}
1288
1289static ssize_t xps_cpus_store(struct netdev_queue *queue,
1290 const char *buf, size_t len)
1291{
1292 struct net_device *dev = queue->dev;
1293 unsigned long index;
1294 cpumask_var_t mask;
1295 int err;
1296
1297 if (!netif_is_multiqueue(dev))
1298 return -ENOENT;
1299
1300 if (!capable(CAP_NET_ADMIN))
1301 return -EPERM;
1302
1303 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1304 return -ENOMEM;
1305
1306 index = get_netdev_queue_index(queue);
1307
1308 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1309 if (err) {
1310 free_cpumask_var(mask);
1311 return err;
1312 }
1313
1314 err = netif_set_xps_queue(dev, mask, index);
1315
1316 free_cpumask_var(mask);
1317
1318 return err ? : len;
1319}
1320
1321static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1322 = __ATTR_RW(xps_cpus);
1323
1324static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1325{
1326 struct net_device *dev = queue->dev;
1327 struct xps_dev_maps *dev_maps;
1328 unsigned long *mask, index;
1329 int j, len, num_tc = 1, tc = 0;
1330
1331 index = get_netdev_queue_index(queue);
1332
1333 if (dev->num_tc) {
1334 num_tc = dev->num_tc;
1335 tc = netdev_txq_to_tc(dev, index);
1336 if (tc < 0)
1337 return -EINVAL;
1338 }
1339 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1340 if (!mask)
1341 return -ENOMEM;
1342
1343 rcu_read_lock();
1344 dev_maps = rcu_dereference(dev->xps_rxqs_map);
1345 if (!dev_maps)
1346 goto out_no_maps;
1347
1348 for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1349 j < dev->num_rx_queues;) {
1350 int i, tci = j * num_tc + tc;
1351 struct xps_map *map;
1352
1353 map = rcu_dereference(dev_maps->attr_map[tci]);
1354 if (!map)
1355 continue;
1356
1357 for (i = map->len; i--;) {
1358 if (map->queues[i] == index) {
1359 set_bit(j, mask);
1360 break;
1361 }
1362 }
1363 }
1364out_no_maps:
1365 rcu_read_unlock();
1366
1367 len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1368 bitmap_free(mask);
1369
1370 return len < PAGE_SIZE ? len : -EINVAL;
1371}
1372
1373static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1374 size_t len)
1375{
1376 struct net_device *dev = queue->dev;
1377 struct net *net = dev_net(dev);
1378 unsigned long *mask, index;
1379 int err;
1380
1381 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1382 return -EPERM;
1383
1384 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1385 if (!mask)
1386 return -ENOMEM;
1387
1388 index = get_netdev_queue_index(queue);
1389
1390 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1391 if (err) {
1392 bitmap_free(mask);
1393 return err;
1394 }
1395
1396 cpus_read_lock();
1397 err = __netif_set_xps_queue(dev, mask, index, true);
1398 cpus_read_unlock();
1399
1400 bitmap_free(mask);
1401 return err ? : len;
1402}
1403
1404static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1405 = __ATTR_RW(xps_rxqs);
1406#endif /* CONFIG_XPS */
1407
1408static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1409 &queue_trans_timeout.attr,
1410 &queue_traffic_class.attr,
1411#ifdef CONFIG_XPS
1412 &xps_cpus_attribute.attr,
1413 &xps_rxqs_attribute.attr,
1414 &queue_tx_maxrate.attr,
1415#endif
1416 NULL
1417};
1418ATTRIBUTE_GROUPS(netdev_queue_default);
1419
1420static void netdev_queue_release(struct kobject *kobj)
1421{
1422 struct netdev_queue *queue = to_netdev_queue(kobj);
1423
1424 memset(kobj, 0, sizeof(*kobj));
1425 dev_put(queue->dev);
1426}
1427
1428static const void *netdev_queue_namespace(struct kobject *kobj)
1429{
1430 struct netdev_queue *queue = to_netdev_queue(kobj);
1431 struct device *dev = &queue->dev->dev;
1432 const void *ns = NULL;
1433
1434 if (dev->class && dev->class->ns_type)
1435 ns = dev->class->namespace(dev);
1436
1437 return ns;
1438}
1439
1440static void netdev_queue_get_ownership(struct kobject *kobj,
1441 kuid_t *uid, kgid_t *gid)
1442{
1443 const struct net *net = netdev_queue_namespace(kobj);
1444
1445 net_ns_get_ownership(net, uid, gid);
1446}
1447
1448static struct kobj_type netdev_queue_ktype __ro_after_init = {
1449 .sysfs_ops = &netdev_queue_sysfs_ops,
1450 .release = netdev_queue_release,
1451 .default_groups = netdev_queue_default_groups,
1452 .namespace = netdev_queue_namespace,
1453 .get_ownership = netdev_queue_get_ownership,
1454};
1455
1456static int netdev_queue_add_kobject(struct net_device *dev, int index)
1457{
1458 struct netdev_queue *queue = dev->_tx + index;
1459 struct kobject *kobj = &queue->kobj;
1460 int error = 0;
1461
1462 kobj->kset = dev->queues_kset;
1463 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1464 "tx-%u", index);
1465 if (error)
1466 goto err;
1467
1468 dev_hold(queue->dev);
1469
1470#ifdef CONFIG_BQL
1471 error = sysfs_create_group(kobj, &dql_group);
1472 if (error)
1473 goto err;
1474#endif
1475
1476 kobject_uevent(kobj, KOBJ_ADD);
1477 return 0;
1478
1479err:
1480 kobject_put(kobj);
1481 return error;
1482}
1483#endif /* CONFIG_SYSFS */
1484
1485int
1486netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1487{
1488#ifdef CONFIG_SYSFS
1489 int i;
1490 int error = 0;
1491
1492 for (i = old_num; i < new_num; i++) {
1493 error = netdev_queue_add_kobject(dev, i);
1494 if (error) {
1495 new_num = old_num;
1496 break;
1497 }
1498 }
1499
1500 while (--i >= new_num) {
1501 struct netdev_queue *queue = dev->_tx + i;
1502
1503 if (!refcount_read(&dev_net(dev)->count))
1504 queue->kobj.uevent_suppress = 1;
1505#ifdef CONFIG_BQL
1506 sysfs_remove_group(&queue->kobj, &dql_group);
1507#endif
1508 kobject_put(&queue->kobj);
1509 }
1510
1511 return error;
1512#else
1513 return 0;
1514#endif /* CONFIG_SYSFS */
1515}
1516
1517static int register_queue_kobjects(struct net_device *dev)
1518{
1519 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1520
1521#ifdef CONFIG_SYSFS
1522 dev->queues_kset = kset_create_and_add("queues",
1523 NULL, &dev->dev.kobj);
1524 if (!dev->queues_kset)
1525 return -ENOMEM;
1526 real_rx = dev->real_num_rx_queues;
1527#endif
1528 real_tx = dev->real_num_tx_queues;
1529
1530 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1531 if (error)
1532 goto error;
1533 rxq = real_rx;
1534
1535 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1536 if (error)
1537 goto error;
1538 txq = real_tx;
1539
1540 return 0;
1541
1542error:
1543 netdev_queue_update_kobjects(dev, txq, 0);
1544 net_rx_queue_update_kobjects(dev, rxq, 0);
1545#ifdef CONFIG_SYSFS
1546 kset_unregister(dev->queues_kset);
1547#endif
1548 return error;
1549}
1550
1551static void remove_queue_kobjects(struct net_device *dev)
1552{
1553 int real_rx = 0, real_tx = 0;
1554
1555#ifdef CONFIG_SYSFS
1556 real_rx = dev->real_num_rx_queues;
1557#endif
1558 real_tx = dev->real_num_tx_queues;
1559
1560 net_rx_queue_update_kobjects(dev, real_rx, 0);
1561 netdev_queue_update_kobjects(dev, real_tx, 0);
1562#ifdef CONFIG_SYSFS
1563 kset_unregister(dev->queues_kset);
1564#endif
1565}
1566
1567static bool net_current_may_mount(void)
1568{
1569 struct net *net = current->nsproxy->net_ns;
1570
1571 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1572}
1573
1574static void *net_grab_current_ns(void)
1575{
1576 struct net *ns = current->nsproxy->net_ns;
1577#ifdef CONFIG_NET_NS
1578 if (ns)
1579 refcount_inc(&ns->passive);
1580#endif
1581 return ns;
1582}
1583
1584static const void *net_initial_ns(void)
1585{
1586 return &init_net;
1587}
1588
1589static const void *net_netlink_ns(struct sock *sk)
1590{
1591 return sock_net(sk);
1592}
1593
1594const struct kobj_ns_type_operations net_ns_type_operations = {
1595 .type = KOBJ_NS_TYPE_NET,
1596 .current_may_mount = net_current_may_mount,
1597 .grab_current_ns = net_grab_current_ns,
1598 .netlink_ns = net_netlink_ns,
1599 .initial_ns = net_initial_ns,
1600 .drop_ns = net_drop_ns,
1601};
1602EXPORT_SYMBOL_GPL(net_ns_type_operations);
1603
1604static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1605{
1606 struct net_device *dev = to_net_dev(d);
1607 int retval;
1608
1609 /* pass interface to uevent. */
1610 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1611 if (retval)
1612 goto exit;
1613
1614 /* pass ifindex to uevent.
1615 * ifindex is useful as it won't change (interface name may change)
1616 * and is what RtNetlink uses natively.
1617 */
1618 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1619
1620exit:
1621 return retval;
1622}
1623
1624/*
1625 * netdev_release -- destroy and free a dead device.
1626 * Called when last reference to device kobject is gone.
1627 */
1628static void netdev_release(struct device *d)
1629{
1630 struct net_device *dev = to_net_dev(d);
1631
1632 BUG_ON(dev->reg_state != NETREG_RELEASED);
1633
1634 /* no need to wait for rcu grace period:
1635 * device is dead and about to be freed.
1636 */
1637 kfree(rcu_access_pointer(dev->ifalias));
1638 netdev_freemem(dev);
1639}
1640
1641static const void *net_namespace(struct device *d)
1642{
1643 struct net_device *dev = to_net_dev(d);
1644
1645 return dev_net(dev);
1646}
1647
1648static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1649{
1650 struct net_device *dev = to_net_dev(d);
1651 const struct net *net = dev_net(dev);
1652
1653 net_ns_get_ownership(net, uid, gid);
1654}
1655
1656static struct class net_class __ro_after_init = {
1657 .name = "net",
1658 .dev_release = netdev_release,
1659 .dev_groups = net_class_groups,
1660 .dev_uevent = netdev_uevent,
1661 .ns_type = &net_ns_type_operations,
1662 .namespace = net_namespace,
1663 .get_ownership = net_get_ownership,
1664};
1665
1666#ifdef CONFIG_OF_NET
1667static int of_dev_node_match(struct device *dev, const void *data)
1668{
1669 int ret = 0;
1670
1671 if (dev->parent)
1672 ret = dev->parent->of_node == data;
1673
1674 return ret == 0 ? dev->of_node == data : ret;
1675}
1676
1677/*
1678 * of_find_net_device_by_node - lookup the net device for the device node
1679 * @np: OF device node
1680 *
1681 * Looks up the net_device structure corresponding with the device node.
1682 * If successful, returns a pointer to the net_device with the embedded
1683 * struct device refcount incremented by one, or NULL on failure. The
1684 * refcount must be dropped when done with the net_device.
1685 */
1686struct net_device *of_find_net_device_by_node(struct device_node *np)
1687{
1688 struct device *dev;
1689
1690 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1691 if (!dev)
1692 return NULL;
1693
1694 return to_net_dev(dev);
1695}
1696EXPORT_SYMBOL(of_find_net_device_by_node);
1697#endif
1698
1699/* Delete sysfs entries but hold kobject reference until after all
1700 * netdev references are gone.
1701 */
1702void netdev_unregister_kobject(struct net_device *ndev)
1703{
1704 struct device *dev = &ndev->dev;
1705
1706 if (!refcount_read(&dev_net(ndev)->count))
1707 dev_set_uevent_suppress(dev, 1);
1708
1709 kobject_get(&dev->kobj);
1710
1711 remove_queue_kobjects(ndev);
1712
1713 pm_runtime_set_memalloc_noio(dev, false);
1714
1715 device_del(dev);
1716}
1717
1718/* Create sysfs entries for network device. */
1719int netdev_register_kobject(struct net_device *ndev)
1720{
1721 struct device *dev = &ndev->dev;
1722 const struct attribute_group **groups = ndev->sysfs_groups;
1723 int error = 0;
1724
1725 device_initialize(dev);
1726 dev->class = &net_class;
1727 dev->platform_data = ndev;
1728 dev->groups = groups;
1729
1730 dev_set_name(dev, "%s", ndev->name);
1731
1732#ifdef CONFIG_SYSFS
1733 /* Allow for a device specific group */
1734 if (*groups)
1735 groups++;
1736
1737 *groups++ = &netstat_group;
1738
1739#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1740 if (ndev->ieee80211_ptr)
1741 *groups++ = &wireless_group;
1742#if IS_ENABLED(CONFIG_WIRELESS_EXT)
1743 else if (ndev->wireless_handlers)
1744 *groups++ = &wireless_group;
1745#endif
1746#endif
1747#endif /* CONFIG_SYSFS */
1748
1749 error = device_add(dev);
1750 if (error)
1751 return error;
1752
1753 error = register_queue_kobjects(ndev);
1754 if (error) {
1755 device_del(dev);
1756 return error;
1757 }
1758
1759 pm_runtime_set_memalloc_noio(dev, true);
1760
1761 return error;
1762}
1763
1764int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1765 const void *ns)
1766{
1767 return class_create_file_ns(&net_class, class_attr, ns);
1768}
1769EXPORT_SYMBOL(netdev_class_create_file_ns);
1770
1771void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1772 const void *ns)
1773{
1774 class_remove_file_ns(&net_class, class_attr, ns);
1775}
1776EXPORT_SYMBOL(netdev_class_remove_file_ns);
1777
1778int __init netdev_kobject_init(void)
1779{
1780 kobj_ns_type_register(&net_ns_type_operations);
1781 return class_register(&net_class);
1782}