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Linux 4.13.16
[linux/fpc-iii.git] / net / core / net-sysfs.c
blobb4f9922b6f233da3d4a189b80b12034f6f7fddeb
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
33 static const char fmt_hex[] = "%#x\n";
34 static const char fmt_dec[] = "%d\n";
35 static const char fmt_ulong[] = "%lu\n";
36 static const char fmt_u64[] = "%llu\n";
37
38 static 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 */
44 static 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) \
61 static ssize_t format_##field(const struct net_device *dev, char *buf) \
62 { \
63 return sprintf(buf, format_string, dev->field); \
64 } \
65 static 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) \
72 NETDEVICE_SHOW(field, format_string); \
73 static DEVICE_ATTR_RO(field)
74
75 #define NETDEVICE_SHOW_RW(field, format_string) \
76 NETDEVICE_SHOW(field, format_string); \
77 static DEVICE_ATTR_RW(field)
78
79 /* use same locking and permission rules as SIF* ioctl's */
80 static 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 if ((ret = (*set)(netdev, new)) == 0)
101 ret = len;
102 }
103 rtnl_unlock();
104 err:
105 return ret;
106 }
107
108 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
109 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
110 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
111 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
112 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
113 NETDEVICE_SHOW_RO(type, fmt_dec);
114 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
115
116 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
117 char *buf)
118 {
119 struct net_device *ndev = to_net_dev(dev);
120
121 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
122 }
123 static DEVICE_ATTR_RO(iflink);
124
125 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
126 {
127 return sprintf(buf, fmt_dec, dev->name_assign_type);
128 }
129
130 static ssize_t name_assign_type_show(struct device *dev,
131 struct device_attribute *attr,
132 char *buf)
133 {
134 struct net_device *ndev = to_net_dev(dev);
135 ssize_t ret = -EINVAL;
136
137 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
138 ret = netdev_show(dev, attr, buf, format_name_assign_type);
139
140 return ret;
141 }
142 static DEVICE_ATTR_RO(name_assign_type);
143
144 /* use same locking rules as GIFHWADDR ioctl's */
145 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
146 char *buf)
147 {
148 struct net_device *ndev = to_net_dev(dev);
149 ssize_t ret = -EINVAL;
150
151 read_lock(&dev_base_lock);
152 if (dev_isalive(ndev))
153 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
154 read_unlock(&dev_base_lock);
155 return ret;
156 }
157 static DEVICE_ATTR_RO(address);
158
159 static ssize_t broadcast_show(struct device *dev,
160 struct device_attribute *attr, char *buf)
161 {
162 struct net_device *ndev = to_net_dev(dev);
163 if (dev_isalive(ndev))
164 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
165 return -EINVAL;
166 }
167 static DEVICE_ATTR_RO(broadcast);
168
169 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
170 {
171 if (!netif_running(dev))
172 return -EINVAL;
173 return dev_change_carrier(dev, (bool) new_carrier);
174 }
175
176 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
177 const char *buf, size_t len)
178 {
179 return netdev_store(dev, attr, buf, len, change_carrier);
180 }
181
182 static ssize_t carrier_show(struct device *dev,
183 struct device_attribute *attr, char *buf)
184 {
185 struct net_device *netdev = to_net_dev(dev);
186 if (netif_running(netdev)) {
187 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
188 }
189 return -EINVAL;
190 }
191 static DEVICE_ATTR_RW(carrier);
192
193 static ssize_t speed_show(struct device *dev,
194 struct device_attribute *attr, char *buf)
195 {
196 struct net_device *netdev = to_net_dev(dev);
197 int ret = -EINVAL;
198
199 if (!rtnl_trylock())
200 return restart_syscall();
201
202 if (netif_running(netdev)) {
203 struct ethtool_link_ksettings cmd;
204
205 if (!__ethtool_get_link_ksettings(netdev, &cmd))
206 ret = sprintf(buf, fmt_dec, cmd.base.speed);
207 }
208 rtnl_unlock();
209 return ret;
210 }
211 static DEVICE_ATTR_RO(speed);
212
213 static ssize_t duplex_show(struct device *dev,
214 struct device_attribute *attr, char *buf)
215 {
216 struct net_device *netdev = to_net_dev(dev);
217 int ret = -EINVAL;
218
219 if (!rtnl_trylock())
220 return restart_syscall();
221
222 if (netif_running(netdev)) {
223 struct ethtool_link_ksettings cmd;
224
225 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
226 const char *duplex;
227
228 switch (cmd.base.duplex) {
229 case DUPLEX_HALF:
230 duplex = "half";
231 break;
232 case DUPLEX_FULL:
233 duplex = "full";
234 break;
235 default:
236 duplex = "unknown";
237 break;
238 }
239 ret = sprintf(buf, "%s\n", duplex);
240 }
241 }
242 rtnl_unlock();
243 return ret;
244 }
245 static DEVICE_ATTR_RO(duplex);
246
247 static ssize_t dormant_show(struct device *dev,
248 struct device_attribute *attr, char *buf)
249 {
250 struct net_device *netdev = to_net_dev(dev);
251
252 if (netif_running(netdev))
253 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
254
255 return -EINVAL;
256 }
257 static DEVICE_ATTR_RO(dormant);
258
259 static const char *const operstates[] = {
260 "unknown",
261 "notpresent", /* currently unused */
262 "down",
263 "lowerlayerdown",
264 "testing", /* currently unused */
265 "dormant",
266 "up"
267 };
268
269 static ssize_t operstate_show(struct device *dev,
270 struct device_attribute *attr, char *buf)
271 {
272 const struct net_device *netdev = to_net_dev(dev);
273 unsigned char operstate;
274
275 read_lock(&dev_base_lock);
276 operstate = netdev->operstate;
277 if (!netif_running(netdev))
278 operstate = IF_OPER_DOWN;
279 read_unlock(&dev_base_lock);
280
281 if (operstate >= ARRAY_SIZE(operstates))
282 return -EINVAL; /* should not happen */
283
284 return sprintf(buf, "%s\n", operstates[operstate]);
285 }
286 static DEVICE_ATTR_RO(operstate);
287
288 static ssize_t carrier_changes_show(struct device *dev,
289 struct device_attribute *attr,
290 char *buf)
291 {
292 struct net_device *netdev = to_net_dev(dev);
293 return sprintf(buf, fmt_dec,
294 atomic_read(&netdev->carrier_changes));
295 }
296 static DEVICE_ATTR_RO(carrier_changes);
297
298 /* read-write attributes */
299
300 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
301 {
302 return dev_set_mtu(dev, (int) new_mtu);
303 }
304
305 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
306 const char *buf, size_t len)
307 {
308 return netdev_store(dev, attr, buf, len, change_mtu);
309 }
310 NETDEVICE_SHOW_RW(mtu, fmt_dec);
311
312 static int change_flags(struct net_device *dev, unsigned long new_flags)
313 {
314 return dev_change_flags(dev, (unsigned int) new_flags);
315 }
316
317 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
318 const char *buf, size_t len)
319 {
320 return netdev_store(dev, attr, buf, len, change_flags);
321 }
322 NETDEVICE_SHOW_RW(flags, fmt_hex);
323
324 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
325 {
326 unsigned int orig_len = dev->tx_queue_len;
327 int res;
328
329 if (new_len != (unsigned int)new_len)
330 return -ERANGE;
331
332 if (new_len != orig_len) {
333 dev->tx_queue_len = new_len;
334 res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev);
335 res = notifier_to_errno(res);
336 if (res) {
337 netdev_err(dev,
338 "refused to change device tx_queue_len\n");
339 dev->tx_queue_len = orig_len;
340 return -EFAULT;
341 }
342 }
343
344 return 0;
345 }
346
347 static ssize_t tx_queue_len_store(struct device *dev,
348 struct device_attribute *attr,
349 const char *buf, size_t len)
350 {
351 if (!capable(CAP_NET_ADMIN))
352 return -EPERM;
353
354 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
355 }
356 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
357
358 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
359 {
360 dev->gro_flush_timeout = val;
361 return 0;
362 }
363
364 static ssize_t gro_flush_timeout_store(struct device *dev,
365 struct device_attribute *attr,
366 const char *buf, size_t len)
367 {
368 if (!capable(CAP_NET_ADMIN))
369 return -EPERM;
370
371 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
372 }
373 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
374
375 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
376 const char *buf, size_t len)
377 {
378 struct net_device *netdev = to_net_dev(dev);
379 struct net *net = dev_net(netdev);
380 size_t count = len;
381 ssize_t ret;
382
383 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
384 return -EPERM;
385
386 /* ignore trailing newline */
387 if (len > 0 && buf[len - 1] == '\n')
388 --count;
389
390 if (!rtnl_trylock())
391 return restart_syscall();
392 ret = dev_set_alias(netdev, buf, count);
393 rtnl_unlock();
394
395 return ret < 0 ? ret : len;
396 }
397
398 static ssize_t ifalias_show(struct device *dev,
399 struct device_attribute *attr, char *buf)
400 {
401 const struct net_device *netdev = to_net_dev(dev);
402 ssize_t ret = 0;
403
404 if (!rtnl_trylock())
405 return restart_syscall();
406 if (netdev->ifalias)
407 ret = sprintf(buf, "%s\n", netdev->ifalias);
408 rtnl_unlock();
409 return ret;
410 }
411 static DEVICE_ATTR_RW(ifalias);
412
413 static int change_group(struct net_device *dev, unsigned long new_group)
414 {
415 dev_set_group(dev, (int) new_group);
416 return 0;
417 }
418
419 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
420 const char *buf, size_t len)
421 {
422 return netdev_store(dev, attr, buf, len, change_group);
423 }
424 NETDEVICE_SHOW(group, fmt_dec);
425 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
426
427 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
428 {
429 return dev_change_proto_down(dev, (bool) proto_down);
430 }
431
432 static ssize_t proto_down_store(struct device *dev,
433 struct device_attribute *attr,
434 const char *buf, size_t len)
435 {
436 return netdev_store(dev, attr, buf, len, change_proto_down);
437 }
438 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
439
440 static ssize_t phys_port_id_show(struct device *dev,
441 struct device_attribute *attr, char *buf)
442 {
443 struct net_device *netdev = to_net_dev(dev);
444 ssize_t ret = -EINVAL;
445
446 if (!rtnl_trylock())
447 return restart_syscall();
448
449 if (dev_isalive(netdev)) {
450 struct netdev_phys_item_id ppid;
451
452 ret = dev_get_phys_port_id(netdev, &ppid);
453 if (!ret)
454 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
455 }
456 rtnl_unlock();
457
458 return ret;
459 }
460 static DEVICE_ATTR_RO(phys_port_id);
461
462 static ssize_t phys_port_name_show(struct device *dev,
463 struct device_attribute *attr, char *buf)
464 {
465 struct net_device *netdev = to_net_dev(dev);
466 ssize_t ret = -EINVAL;
467
468 if (!rtnl_trylock())
469 return restart_syscall();
470
471 if (dev_isalive(netdev)) {
472 char name[IFNAMSIZ];
473
474 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
475 if (!ret)
476 ret = sprintf(buf, "%s\n", name);
477 }
478 rtnl_unlock();
479
480 return ret;
481 }
482 static DEVICE_ATTR_RO(phys_port_name);
483
484 static ssize_t phys_switch_id_show(struct device *dev,
485 struct device_attribute *attr, char *buf)
486 {
487 struct net_device *netdev = to_net_dev(dev);
488 ssize_t ret = -EINVAL;
489
490 if (!rtnl_trylock())
491 return restart_syscall();
492
493 if (dev_isalive(netdev)) {
494 struct switchdev_attr attr = {
495 .orig_dev = netdev,
496 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
497 .flags = SWITCHDEV_F_NO_RECURSE,
498 };
499
500 ret = switchdev_port_attr_get(netdev, &attr);
501 if (!ret)
502 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
503 attr.u.ppid.id);
504 }
505 rtnl_unlock();
506
507 return ret;
508 }
509 static DEVICE_ATTR_RO(phys_switch_id);
510
511 static struct attribute *net_class_attrs[] = {
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 NULL,
540 };
541 ATTRIBUTE_GROUPS(net_class);
542
543 /* Show a given an attribute in the statistics group */
544 static ssize_t netstat_show(const struct device *d,
545 struct device_attribute *attr, char *buf,
546 unsigned long offset)
547 {
548 struct net_device *dev = to_net_dev(d);
549 ssize_t ret = -EINVAL;
550
551 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
552 offset % sizeof(u64) != 0);
553
554 read_lock(&dev_base_lock);
555 if (dev_isalive(dev)) {
556 struct rtnl_link_stats64 temp;
557 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
558
559 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
560 }
561 read_unlock(&dev_base_lock);
562 return ret;
563 }
564
565 /* generate a read-only statistics attribute */
566 #define NETSTAT_ENTRY(name) \
567 static ssize_t name##_show(struct device *d, \
568 struct device_attribute *attr, char *buf) \
569 { \
570 return netstat_show(d, attr, buf, \
571 offsetof(struct rtnl_link_stats64, name)); \
572 } \
573 static DEVICE_ATTR_RO(name)
574
575 NETSTAT_ENTRY(rx_packets);
576 NETSTAT_ENTRY(tx_packets);
577 NETSTAT_ENTRY(rx_bytes);
578 NETSTAT_ENTRY(tx_bytes);
579 NETSTAT_ENTRY(rx_errors);
580 NETSTAT_ENTRY(tx_errors);
581 NETSTAT_ENTRY(rx_dropped);
582 NETSTAT_ENTRY(tx_dropped);
583 NETSTAT_ENTRY(multicast);
584 NETSTAT_ENTRY(collisions);
585 NETSTAT_ENTRY(rx_length_errors);
586 NETSTAT_ENTRY(rx_over_errors);
587 NETSTAT_ENTRY(rx_crc_errors);
588 NETSTAT_ENTRY(rx_frame_errors);
589 NETSTAT_ENTRY(rx_fifo_errors);
590 NETSTAT_ENTRY(rx_missed_errors);
591 NETSTAT_ENTRY(tx_aborted_errors);
592 NETSTAT_ENTRY(tx_carrier_errors);
593 NETSTAT_ENTRY(tx_fifo_errors);
594 NETSTAT_ENTRY(tx_heartbeat_errors);
595 NETSTAT_ENTRY(tx_window_errors);
596 NETSTAT_ENTRY(rx_compressed);
597 NETSTAT_ENTRY(tx_compressed);
598 NETSTAT_ENTRY(rx_nohandler);
599
600 static struct attribute *netstat_attrs[] = {
601 &dev_attr_rx_packets.attr,
602 &dev_attr_tx_packets.attr,
603 &dev_attr_rx_bytes.attr,
604 &dev_attr_tx_bytes.attr,
605 &dev_attr_rx_errors.attr,
606 &dev_attr_tx_errors.attr,
607 &dev_attr_rx_dropped.attr,
608 &dev_attr_tx_dropped.attr,
609 &dev_attr_multicast.attr,
610 &dev_attr_collisions.attr,
611 &dev_attr_rx_length_errors.attr,
612 &dev_attr_rx_over_errors.attr,
613 &dev_attr_rx_crc_errors.attr,
614 &dev_attr_rx_frame_errors.attr,
615 &dev_attr_rx_fifo_errors.attr,
616 &dev_attr_rx_missed_errors.attr,
617 &dev_attr_tx_aborted_errors.attr,
618 &dev_attr_tx_carrier_errors.attr,
619 &dev_attr_tx_fifo_errors.attr,
620 &dev_attr_tx_heartbeat_errors.attr,
621 &dev_attr_tx_window_errors.attr,
622 &dev_attr_rx_compressed.attr,
623 &dev_attr_tx_compressed.attr,
624 &dev_attr_rx_nohandler.attr,
625 NULL
626 };
627
628
629 static const struct attribute_group netstat_group = {
630 .name = "statistics",
631 .attrs = netstat_attrs,
632 };
633
634 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
635 static struct attribute *wireless_attrs[] = {
636 NULL
637 };
638
639 static const struct attribute_group wireless_group = {
640 .name = "wireless",
641 .attrs = wireless_attrs,
642 };
643 #endif
644
645 #else /* CONFIG_SYSFS */
646 #define net_class_groups NULL
647 #endif /* CONFIG_SYSFS */
648
649 #ifdef CONFIG_SYSFS
650 #define to_rx_queue_attr(_attr) container_of(_attr, \
651 struct rx_queue_attribute, attr)
652
653 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
654
655 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
656 char *buf)
657 {
658 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
659 struct netdev_rx_queue *queue = to_rx_queue(kobj);
660
661 if (!attribute->show)
662 return -EIO;
663
664 return attribute->show(queue, attribute, buf);
665 }
666
667 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
668 const char *buf, size_t count)
669 {
670 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
671 struct netdev_rx_queue *queue = to_rx_queue(kobj);
672
673 if (!attribute->store)
674 return -EIO;
675
676 return attribute->store(queue, attribute, buf, count);
677 }
678
679 static const struct sysfs_ops rx_queue_sysfs_ops = {
680 .show = rx_queue_attr_show,
681 .store = rx_queue_attr_store,
682 };
683
684 #ifdef CONFIG_RPS
685 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
686 struct rx_queue_attribute *attribute, 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
708 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
709 struct rx_queue_attribute *attribute,
710 const char *buf, size_t len)
711 {
712 struct rps_map *old_map, *map;
713 cpumask_var_t mask;
714 int err, cpu, i;
715 static DEFINE_MUTEX(rps_map_mutex);
716
717 if (!capable(CAP_NET_ADMIN))
718 return -EPERM;
719
720 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
721 return -ENOMEM;
722
723 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
724 if (err) {
725 free_cpumask_var(mask);
726 return err;
727 }
728
729 map = kzalloc(max_t(unsigned int,
730 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
731 GFP_KERNEL);
732 if (!map) {
733 free_cpumask_var(mask);
734 return -ENOMEM;
735 }
736
737 i = 0;
738 for_each_cpu_and(cpu, mask, cpu_online_mask)
739 map->cpus[i++] = cpu;
740
741 if (i)
742 map->len = i;
743 else {
744 kfree(map);
745 map = NULL;
746 }
747
748 mutex_lock(&rps_map_mutex);
749 old_map = rcu_dereference_protected(queue->rps_map,
750 mutex_is_locked(&rps_map_mutex));
751 rcu_assign_pointer(queue->rps_map, map);
752
753 if (map)
754 static_key_slow_inc(&rps_needed);
755 if (old_map)
756 static_key_slow_dec(&rps_needed);
757
758 mutex_unlock(&rps_map_mutex);
759
760 if (old_map)
761 kfree_rcu(old_map, rcu);
762
763 free_cpumask_var(mask);
764 return len;
765 }
766
767 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
768 struct rx_queue_attribute *attr,
769 char *buf)
770 {
771 struct rps_dev_flow_table *flow_table;
772 unsigned long val = 0;
773
774 rcu_read_lock();
775 flow_table = rcu_dereference(queue->rps_flow_table);
776 if (flow_table)
777 val = (unsigned long)flow_table->mask + 1;
778 rcu_read_unlock();
779
780 return sprintf(buf, "%lu\n", val);
781 }
782
783 static void rps_dev_flow_table_release(struct rcu_head *rcu)
784 {
785 struct rps_dev_flow_table *table = container_of(rcu,
786 struct rps_dev_flow_table, rcu);
787 vfree(table);
788 }
789
790 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
791 struct rx_queue_attribute *attr,
792 const char *buf, size_t len)
793 {
794 unsigned long mask, count;
795 struct rps_dev_flow_table *table, *old_table;
796 static DEFINE_SPINLOCK(rps_dev_flow_lock);
797 int rc;
798
799 if (!capable(CAP_NET_ADMIN))
800 return -EPERM;
801
802 rc = kstrtoul(buf, 0, &count);
803 if (rc < 0)
804 return rc;
805
806 if (count) {
807 mask = count - 1;
808 /* mask = roundup_pow_of_two(count) - 1;
809 * without overflows...
810 */
811 while ((mask | (mask >> 1)) != mask)
812 mask |= (mask >> 1);
813 /* On 64 bit arches, must check mask fits in table->mask (u32),
814 * and on 32bit arches, must check
815 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
816 */
817 #if BITS_PER_LONG > 32
818 if (mask > (unsigned long)(u32)mask)
819 return -EINVAL;
820 #else
821 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
822 / sizeof(struct rps_dev_flow)) {
823 /* Enforce a limit to prevent overflow */
824 return -EINVAL;
825 }
826 #endif
827 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
828 if (!table)
829 return -ENOMEM;
830
831 table->mask = mask;
832 for (count = 0; count <= mask; count++)
833 table->flows[count].cpu = RPS_NO_CPU;
834 } else
835 table = NULL;
836
837 spin_lock(&rps_dev_flow_lock);
838 old_table = rcu_dereference_protected(queue->rps_flow_table,
839 lockdep_is_held(&rps_dev_flow_lock));
840 rcu_assign_pointer(queue->rps_flow_table, table);
841 spin_unlock(&rps_dev_flow_lock);
842
843 if (old_table)
844 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
845
846 return len;
847 }
848
849 static struct rx_queue_attribute rps_cpus_attribute =
850 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
851
852
853 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
854 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
855 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
856 #endif /* CONFIG_RPS */
857
858 static struct attribute *rx_queue_default_attrs[] = {
859 #ifdef CONFIG_RPS
860 &rps_cpus_attribute.attr,
861 &rps_dev_flow_table_cnt_attribute.attr,
862 #endif
863 NULL
864 };
865
866 static void rx_queue_release(struct kobject *kobj)
867 {
868 struct netdev_rx_queue *queue = to_rx_queue(kobj);
869 #ifdef CONFIG_RPS
870 struct rps_map *map;
871 struct rps_dev_flow_table *flow_table;
872
873
874 map = rcu_dereference_protected(queue->rps_map, 1);
875 if (map) {
876 RCU_INIT_POINTER(queue->rps_map, NULL);
877 kfree_rcu(map, rcu);
878 }
879
880 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
881 if (flow_table) {
882 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
883 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
884 }
885 #endif
886
887 memset(kobj, 0, sizeof(*kobj));
888 dev_put(queue->dev);
889 }
890
891 static const void *rx_queue_namespace(struct kobject *kobj)
892 {
893 struct netdev_rx_queue *queue = to_rx_queue(kobj);
894 struct device *dev = &queue->dev->dev;
895 const void *ns = NULL;
896
897 if (dev->class && dev->class->ns_type)
898 ns = dev->class->namespace(dev);
899
900 return ns;
901 }
902
903 static struct kobj_type rx_queue_ktype = {
904 .sysfs_ops = &rx_queue_sysfs_ops,
905 .release = rx_queue_release,
906 .default_attrs = rx_queue_default_attrs,
907 .namespace = rx_queue_namespace
908 };
909
910 static int rx_queue_add_kobject(struct net_device *dev, int index)
911 {
912 struct netdev_rx_queue *queue = dev->_rx + index;
913 struct kobject *kobj = &queue->kobj;
914 int error = 0;
915
916 kobj->kset = dev->queues_kset;
917 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
918 "rx-%u", index);
919 if (error)
920 goto exit;
921
922 if (dev->sysfs_rx_queue_group) {
923 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
924 if (error)
925 goto exit;
926 }
927
928 kobject_uevent(kobj, KOBJ_ADD);
929 dev_hold(queue->dev);
930
931 return error;
932 exit:
933 kobject_put(kobj);
934 return error;
935 }
936 #endif /* CONFIG_SYSFS */
937
938 int
939 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
940 {
941 #ifdef CONFIG_SYSFS
942 int i;
943 int error = 0;
944
945 #ifndef CONFIG_RPS
946 if (!dev->sysfs_rx_queue_group)
947 return 0;
948 #endif
949 for (i = old_num; i < new_num; i++) {
950 error = rx_queue_add_kobject(dev, i);
951 if (error) {
952 new_num = old_num;
953 break;
954 }
955 }
956
957 while (--i >= new_num) {
958 struct kobject *kobj = &dev->_rx[i].kobj;
959
960 if (!atomic_read(&dev_net(dev)->count))
961 kobj->uevent_suppress = 1;
962 if (dev->sysfs_rx_queue_group)
963 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
964 kobject_put(kobj);
965 }
966
967 return error;
968 #else
969 return 0;
970 #endif
971 }
972
973 #ifdef CONFIG_SYSFS
974 /*
975 * netdev_queue sysfs structures and functions.
976 */
977 struct netdev_queue_attribute {
978 struct attribute attr;
979 ssize_t (*show)(struct netdev_queue *queue,
980 struct netdev_queue_attribute *attr, char *buf);
981 ssize_t (*store)(struct netdev_queue *queue,
982 struct netdev_queue_attribute *attr, const char *buf, size_t len);
983 };
984 #define to_netdev_queue_attr(_attr) container_of(_attr, \
985 struct netdev_queue_attribute, attr)
986
987 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
988
989 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
990 struct attribute *attr, char *buf)
991 {
992 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
993 struct netdev_queue *queue = to_netdev_queue(kobj);
994
995 if (!attribute->show)
996 return -EIO;
997
998 return attribute->show(queue, attribute, buf);
999 }
1000
1001 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1002 struct attribute *attr,
1003 const char *buf, size_t count)
1004 {
1005 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
1006 struct netdev_queue *queue = to_netdev_queue(kobj);
1007
1008 if (!attribute->store)
1009 return -EIO;
1010
1011 return attribute->store(queue, attribute, buf, count);
1012 }
1013
1014 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1015 .show = netdev_queue_attr_show,
1016 .store = netdev_queue_attr_store,
1017 };
1018
1019 static ssize_t show_trans_timeout(struct netdev_queue *queue,
1020 struct netdev_queue_attribute *attribute,
1021 char *buf)
1022 {
1023 unsigned long trans_timeout;
1024
1025 spin_lock_irq(&queue->_xmit_lock);
1026 trans_timeout = queue->trans_timeout;
1027 spin_unlock_irq(&queue->_xmit_lock);
1028
1029 return sprintf(buf, "%lu", trans_timeout);
1030 }
1031
1032 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1033 {
1034 struct net_device *dev = queue->dev;
1035 unsigned int i;
1036
1037 i = queue - dev->_tx;
1038 BUG_ON(i >= dev->num_tx_queues);
1039
1040 return i;
1041 }
1042
1043 static ssize_t show_traffic_class(struct netdev_queue *queue,
1044 struct netdev_queue_attribute *attribute,
1045 char *buf)
1046 {
1047 struct net_device *dev = queue->dev;
1048 int index = get_netdev_queue_index(queue);
1049 int tc = netdev_txq_to_tc(dev, index);
1050
1051 if (tc < 0)
1052 return -EINVAL;
1053
1054 return sprintf(buf, "%u\n", tc);
1055 }
1056
1057 #ifdef CONFIG_XPS
1058 static ssize_t show_tx_maxrate(struct netdev_queue *queue,
1059 struct netdev_queue_attribute *attribute,
1060 char *buf)
1061 {
1062 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1063 }
1064
1065 static ssize_t set_tx_maxrate(struct netdev_queue *queue,
1066 struct netdev_queue_attribute *attribute,
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
1092 static struct netdev_queue_attribute queue_tx_maxrate =
1093 __ATTR(tx_maxrate, S_IRUGO | S_IWUSR,
1094 show_tx_maxrate, set_tx_maxrate);
1095 #endif
1096
1097 static struct netdev_queue_attribute queue_trans_timeout =
1098 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
1099
1100 static struct netdev_queue_attribute queue_traffic_class =
1101 __ATTR(traffic_class, S_IRUGO, show_traffic_class, NULL);
1102
1103 #ifdef CONFIG_BQL
1104 /*
1105 * Byte queue limits sysfs structures and functions.
1106 */
1107 static ssize_t bql_show(char *buf, unsigned int value)
1108 {
1109 return sprintf(buf, "%u\n", value);
1110 }
1111
1112 static ssize_t bql_set(const char *buf, const size_t count,
1113 unsigned int *pvalue)
1114 {
1115 unsigned int value;
1116 int err;
1117
1118 if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
1119 value = DQL_MAX_LIMIT;
1120 else {
1121 err = kstrtouint(buf, 10, &value);
1122 if (err < 0)
1123 return err;
1124 if (value > DQL_MAX_LIMIT)
1125 return -EINVAL;
1126 }
1127
1128 *pvalue = value;
1129
1130 return count;
1131 }
1132
1133 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1134 struct netdev_queue_attribute *attr,
1135 char *buf)
1136 {
1137 struct dql *dql = &queue->dql;
1138
1139 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1140 }
1141
1142 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1143 struct netdev_queue_attribute *attribute,
1144 const char *buf, size_t len)
1145 {
1146 struct dql *dql = &queue->dql;
1147 unsigned int value;
1148 int err;
1149
1150 err = kstrtouint(buf, 10, &value);
1151 if (err < 0)
1152 return err;
1153
1154 dql->slack_hold_time = msecs_to_jiffies(value);
1155
1156 return len;
1157 }
1158
1159 static struct netdev_queue_attribute bql_hold_time_attribute =
1160 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
1161 bql_set_hold_time);
1162
1163 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1164 struct netdev_queue_attribute *attr,
1165 char *buf)
1166 {
1167 struct dql *dql = &queue->dql;
1168
1169 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1170 }
1171
1172 static struct netdev_queue_attribute bql_inflight_attribute =
1173 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1174
1175 #define BQL_ATTR(NAME, FIELD) \
1176 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1177 struct netdev_queue_attribute *attr, \
1178 char *buf) \
1179 { \
1180 return bql_show(buf, queue->dql.FIELD); \
1181 } \
1182 \
1183 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1184 struct netdev_queue_attribute *attr, \
1185 const char *buf, size_t len) \
1186 { \
1187 return bql_set(buf, len, &queue->dql.FIELD); \
1188 } \
1189 \
1190 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \
1191 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \
1192 bql_set_ ## NAME);
1193
1194 BQL_ATTR(limit, limit)
1195 BQL_ATTR(limit_max, max_limit)
1196 BQL_ATTR(limit_min, min_limit)
1197
1198 static struct attribute *dql_attrs[] = {
1199 &bql_limit_attribute.attr,
1200 &bql_limit_max_attribute.attr,
1201 &bql_limit_min_attribute.attr,
1202 &bql_hold_time_attribute.attr,
1203 &bql_inflight_attribute.attr,
1204 NULL
1205 };
1206
1207 static const struct attribute_group dql_group = {
1208 .name = "byte_queue_limits",
1209 .attrs = dql_attrs,
1210 };
1211 #endif /* CONFIG_BQL */
1212
1213 #ifdef CONFIG_XPS
1214 static ssize_t show_xps_map(struct netdev_queue *queue,
1215 struct netdev_queue_attribute *attribute, char *buf)
1216 {
1217 struct net_device *dev = queue->dev;
1218 int cpu, len, num_tc = 1, tc = 0;
1219 struct xps_dev_maps *dev_maps;
1220 cpumask_var_t mask;
1221 unsigned long index;
1222
1223 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1224 return -ENOMEM;
1225
1226 index = get_netdev_queue_index(queue);
1227
1228 if (dev->num_tc) {
1229 num_tc = dev->num_tc;
1230 tc = netdev_txq_to_tc(dev, index);
1231 if (tc < 0)
1232 return -EINVAL;
1233 }
1234
1235 rcu_read_lock();
1236 dev_maps = rcu_dereference(dev->xps_maps);
1237 if (dev_maps) {
1238 for_each_possible_cpu(cpu) {
1239 int i, tci = cpu * num_tc + tc;
1240 struct xps_map *map;
1241
1242 map = rcu_dereference(dev_maps->cpu_map[tci]);
1243 if (!map)
1244 continue;
1245
1246 for (i = map->len; i--;) {
1247 if (map->queues[i] == index) {
1248 cpumask_set_cpu(cpu, mask);
1249 break;
1250 }
1251 }
1252 }
1253 }
1254 rcu_read_unlock();
1255
1256 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1257 free_cpumask_var(mask);
1258 return len < PAGE_SIZE ? len : -EINVAL;
1259 }
1260
1261 static ssize_t store_xps_map(struct netdev_queue *queue,
1262 struct netdev_queue_attribute *attribute,
1263 const char *buf, size_t len)
1264 {
1265 struct net_device *dev = queue->dev;
1266 unsigned long index;
1267 cpumask_var_t mask;
1268 int err;
1269
1270 if (!capable(CAP_NET_ADMIN))
1271 return -EPERM;
1272
1273 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1274 return -ENOMEM;
1275
1276 index = get_netdev_queue_index(queue);
1277
1278 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1279 if (err) {
1280 free_cpumask_var(mask);
1281 return err;
1282 }
1283
1284 err = netif_set_xps_queue(dev, mask, index);
1285
1286 free_cpumask_var(mask);
1287
1288 return err ? : len;
1289 }
1290
1291 static struct netdev_queue_attribute xps_cpus_attribute =
1292 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1293 #endif /* CONFIG_XPS */
1294
1295 static struct attribute *netdev_queue_default_attrs[] = {
1296 &queue_trans_timeout.attr,
1297 &queue_traffic_class.attr,
1298 #ifdef CONFIG_XPS
1299 &xps_cpus_attribute.attr,
1300 &queue_tx_maxrate.attr,
1301 #endif
1302 NULL
1303 };
1304
1305 static void netdev_queue_release(struct kobject *kobj)
1306 {
1307 struct netdev_queue *queue = to_netdev_queue(kobj);
1308
1309 memset(kobj, 0, sizeof(*kobj));
1310 dev_put(queue->dev);
1311 }
1312
1313 static const void *netdev_queue_namespace(struct kobject *kobj)
1314 {
1315 struct netdev_queue *queue = to_netdev_queue(kobj);
1316 struct device *dev = &queue->dev->dev;
1317 const void *ns = NULL;
1318
1319 if (dev->class && dev->class->ns_type)
1320 ns = dev->class->namespace(dev);
1321
1322 return ns;
1323 }
1324
1325 static struct kobj_type netdev_queue_ktype = {
1326 .sysfs_ops = &netdev_queue_sysfs_ops,
1327 .release = netdev_queue_release,
1328 .default_attrs = netdev_queue_default_attrs,
1329 .namespace = netdev_queue_namespace,
1330 };
1331
1332 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1333 {
1334 struct netdev_queue *queue = dev->_tx + index;
1335 struct kobject *kobj = &queue->kobj;
1336 int error = 0;
1337
1338 kobj->kset = dev->queues_kset;
1339 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1340 "tx-%u", index);
1341 if (error)
1342 goto exit;
1343
1344 #ifdef CONFIG_BQL
1345 error = sysfs_create_group(kobj, &dql_group);
1346 if (error)
1347 goto exit;
1348 #endif
1349
1350 kobject_uevent(kobj, KOBJ_ADD);
1351 dev_hold(queue->dev);
1352
1353 return 0;
1354 exit:
1355 kobject_put(kobj);
1356 return error;
1357 }
1358 #endif /* CONFIG_SYSFS */
1359
1360 int
1361 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1362 {
1363 #ifdef CONFIG_SYSFS
1364 int i;
1365 int error = 0;
1366
1367 for (i = old_num; i < new_num; i++) {
1368 error = netdev_queue_add_kobject(dev, i);
1369 if (error) {
1370 new_num = old_num;
1371 break;
1372 }
1373 }
1374
1375 while (--i >= new_num) {
1376 struct netdev_queue *queue = dev->_tx + i;
1377
1378 if (!atomic_read(&dev_net(dev)->count))
1379 queue->kobj.uevent_suppress = 1;
1380 #ifdef CONFIG_BQL
1381 sysfs_remove_group(&queue->kobj, &dql_group);
1382 #endif
1383 kobject_put(&queue->kobj);
1384 }
1385
1386 return error;
1387 #else
1388 return 0;
1389 #endif /* CONFIG_SYSFS */
1390 }
1391
1392 static int register_queue_kobjects(struct net_device *dev)
1393 {
1394 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1395
1396 #ifdef CONFIG_SYSFS
1397 dev->queues_kset = kset_create_and_add("queues",
1398 NULL, &dev->dev.kobj);
1399 if (!dev->queues_kset)
1400 return -ENOMEM;
1401 real_rx = dev->real_num_rx_queues;
1402 #endif
1403 real_tx = dev->real_num_tx_queues;
1404
1405 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1406 if (error)
1407 goto error;
1408 rxq = real_rx;
1409
1410 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1411 if (error)
1412 goto error;
1413 txq = real_tx;
1414
1415 return 0;
1416
1417 error:
1418 netdev_queue_update_kobjects(dev, txq, 0);
1419 net_rx_queue_update_kobjects(dev, rxq, 0);
1420 return error;
1421 }
1422
1423 static void remove_queue_kobjects(struct net_device *dev)
1424 {
1425 int real_rx = 0, real_tx = 0;
1426
1427 #ifdef CONFIG_SYSFS
1428 real_rx = dev->real_num_rx_queues;
1429 #endif
1430 real_tx = dev->real_num_tx_queues;
1431
1432 net_rx_queue_update_kobjects(dev, real_rx, 0);
1433 netdev_queue_update_kobjects(dev, real_tx, 0);
1434 #ifdef CONFIG_SYSFS
1435 kset_unregister(dev->queues_kset);
1436 #endif
1437 }
1438
1439 static bool net_current_may_mount(void)
1440 {
1441 struct net *net = current->nsproxy->net_ns;
1442
1443 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1444 }
1445
1446 static void *net_grab_current_ns(void)
1447 {
1448 struct net *ns = current->nsproxy->net_ns;
1449 #ifdef CONFIG_NET_NS
1450 if (ns)
1451 refcount_inc(&ns->passive);
1452 #endif
1453 return ns;
1454 }
1455
1456 static const void *net_initial_ns(void)
1457 {
1458 return &init_net;
1459 }
1460
1461 static const void *net_netlink_ns(struct sock *sk)
1462 {
1463 return sock_net(sk);
1464 }
1465
1466 struct kobj_ns_type_operations net_ns_type_operations = {
1467 .type = KOBJ_NS_TYPE_NET,
1468 .current_may_mount = net_current_may_mount,
1469 .grab_current_ns = net_grab_current_ns,
1470 .netlink_ns = net_netlink_ns,
1471 .initial_ns = net_initial_ns,
1472 .drop_ns = net_drop_ns,
1473 };
1474 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1475
1476 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1477 {
1478 struct net_device *dev = to_net_dev(d);
1479 int retval;
1480
1481 /* pass interface to uevent. */
1482 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1483 if (retval)
1484 goto exit;
1485
1486 /* pass ifindex to uevent.
1487 * ifindex is useful as it won't change (interface name may change)
1488 * and is what RtNetlink uses natively. */
1489 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1490
1491 exit:
1492 return retval;
1493 }
1494
1495 /*
1496 * netdev_release -- destroy and free a dead device.
1497 * Called when last reference to device kobject is gone.
1498 */
1499 static void netdev_release(struct device *d)
1500 {
1501 struct net_device *dev = to_net_dev(d);
1502
1503 BUG_ON(dev->reg_state != NETREG_RELEASED);
1504
1505 kfree(dev->ifalias);
1506 netdev_freemem(dev);
1507 }
1508
1509 static const void *net_namespace(struct device *d)
1510 {
1511 struct net_device *dev = to_net_dev(d);
1512
1513 return dev_net(dev);
1514 }
1515
1516 static struct class net_class = {
1517 .name = "net",
1518 .dev_release = netdev_release,
1519 .dev_groups = net_class_groups,
1520 .dev_uevent = netdev_uevent,
1521 .ns_type = &net_ns_type_operations,
1522 .namespace = net_namespace,
1523 };
1524
1525 #ifdef CONFIG_OF_NET
1526 static int of_dev_node_match(struct device *dev, const void *data)
1527 {
1528 int ret = 0;
1529
1530 if (dev->parent)
1531 ret = dev->parent->of_node == data;
1532
1533 return ret == 0 ? dev->of_node == data : ret;
1534 }
1535
1536 /*
1537 * of_find_net_device_by_node - lookup the net device for the device node
1538 * @np: OF device node
1539 *
1540 * Looks up the net_device structure corresponding with the device node.
1541 * If successful, returns a pointer to the net_device with the embedded
1542 * struct device refcount incremented by one, or NULL on failure. The
1543 * refcount must be dropped when done with the net_device.
1544 */
1545 struct net_device *of_find_net_device_by_node(struct device_node *np)
1546 {
1547 struct device *dev;
1548
1549 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1550 if (!dev)
1551 return NULL;
1552
1553 return to_net_dev(dev);
1554 }
1555 EXPORT_SYMBOL(of_find_net_device_by_node);
1556 #endif
1557
1558 /* Delete sysfs entries but hold kobject reference until after all
1559 * netdev references are gone.
1560 */
1561 void netdev_unregister_kobject(struct net_device *ndev)
1562 {
1563 struct device *dev = &(ndev->dev);
1564
1565 if (!atomic_read(&dev_net(ndev)->count))
1566 dev_set_uevent_suppress(dev, 1);
1567
1568 kobject_get(&dev->kobj);
1569
1570 remove_queue_kobjects(ndev);
1571
1572 pm_runtime_set_memalloc_noio(dev, false);
1573
1574 device_del(dev);
1575 }
1576
1577 /* Create sysfs entries for network device. */
1578 int netdev_register_kobject(struct net_device *ndev)
1579 {
1580 struct device *dev = &(ndev->dev);
1581 const struct attribute_group **groups = ndev->sysfs_groups;
1582 int error = 0;
1583
1584 device_initialize(dev);
1585 dev->class = &net_class;
1586 dev->platform_data = ndev;
1587 dev->groups = groups;
1588
1589 dev_set_name(dev, "%s", ndev->name);
1590
1591 #ifdef CONFIG_SYSFS
1592 /* Allow for a device specific group */
1593 if (*groups)
1594 groups++;
1595
1596 *groups++ = &netstat_group;
1597
1598 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1599 if (ndev->ieee80211_ptr)
1600 *groups++ = &wireless_group;
1601 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1602 else if (ndev->wireless_handlers)
1603 *groups++ = &wireless_group;
1604 #endif
1605 #endif
1606 #endif /* CONFIG_SYSFS */
1607
1608 error = device_add(dev);
1609 if (error)
1610 return error;
1611
1612 error = register_queue_kobjects(ndev);
1613 if (error) {
1614 device_del(dev);
1615 return error;
1616 }
1617
1618 pm_runtime_set_memalloc_noio(dev, true);
1619
1620 return error;
1621 }
1622
1623 int netdev_class_create_file_ns(struct class_attribute *class_attr,
1624 const void *ns)
1625 {
1626 return class_create_file_ns(&net_class, class_attr, ns);
1627 }
1628 EXPORT_SYMBOL(netdev_class_create_file_ns);
1629
1630 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1631 const void *ns)
1632 {
1633 class_remove_file_ns(&net_class, class_attr, ns);
1634 }
1635 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1636
1637 int __init netdev_kobject_init(void)
1638 {
1639 kobj_ns_type_register(&net_ns_type_operations);
1640 return class_register(&net_class);
1641 }
Linux with added FPC-III support