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Linux 4.8.3
[linux/fpc-iii.git] / net / core / net-sysfs.c
blob6e4f3472108015f0fbd7ac6f3dfe7e74a019e8be
1 /*
2 * net-sysfs.c - network device class and attributes
3 *
4 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/capability.h>
13 #include <linux/kernel.h>
14 #include <linux/netdevice.h>
15 #include <net/switchdev.h>
16 #include <linux/if_arp.h>
17 #include <linux/slab.h>
18 #include <linux/nsproxy.h>
19 #include <net/sock.h>
20 #include <net/net_namespace.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/vmalloc.h>
23 #include <linux/export.h>
24 #include <linux/jiffies.h>
25 #include <linux/pm_runtime.h>
26 #include <linux/of.h>
27 #include <linux/of_net.h>
28
29 #include "net-sysfs.h"
30
31 #ifdef CONFIG_SYSFS
32 static const char fmt_hex[] = "%#x\n";
33 static const char fmt_dec[] = "%d\n";
34 static const char fmt_ulong[] = "%lu\n";
35 static const char fmt_u64[] = "%llu\n";
36
37 static inline int dev_isalive(const struct net_device *dev)
38 {
39 return dev->reg_state <= NETREG_REGISTERED;
40 }
41
42 /* use same locking rules as GIF* ioctl's */
43 static ssize_t netdev_show(const struct device *dev,
44 struct device_attribute *attr, char *buf,
45 ssize_t (*format)(const struct net_device *, char *))
46 {
47 struct net_device *ndev = to_net_dev(dev);
48 ssize_t ret = -EINVAL;
49
50 read_lock(&dev_base_lock);
51 if (dev_isalive(ndev))
52 ret = (*format)(ndev, buf);
53 read_unlock(&dev_base_lock);
54
55 return ret;
56 }
57
58 /* generate a show function for simple field */
59 #define NETDEVICE_SHOW(field, format_string) \
60 static ssize_t format_##field(const struct net_device *dev, char *buf) \
61 { \
62 return sprintf(buf, format_string, dev->field); \
63 } \
64 static ssize_t field##_show(struct device *dev, \
65 struct device_attribute *attr, char *buf) \
66 { \
67 return netdev_show(dev, attr, buf, format_##field); \
68 } \
69
70 #define NETDEVICE_SHOW_RO(field, format_string) \
71 NETDEVICE_SHOW(field, format_string); \
72 static DEVICE_ATTR_RO(field)
73
74 #define NETDEVICE_SHOW_RW(field, format_string) \
75 NETDEVICE_SHOW(field, format_string); \
76 static DEVICE_ATTR_RW(field)
77
78 /* use same locking and permission rules as SIF* ioctl's */
79 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
80 const char *buf, size_t len,
81 int (*set)(struct net_device *, unsigned long))
82 {
83 struct net_device *netdev = to_net_dev(dev);
84 struct net *net = dev_net(netdev);
85 unsigned long new;
86 int ret = -EINVAL;
87
88 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
89 return -EPERM;
90
91 ret = kstrtoul(buf, 0, &new);
92 if (ret)
93 goto err;
94
95 if (!rtnl_trylock())
96 return restart_syscall();
97
98 if (dev_isalive(netdev)) {
99 if ((ret = (*set)(netdev, new)) == 0)
100 ret = len;
101 }
102 rtnl_unlock();
103 err:
104 return ret;
105 }
106
107 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
108 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
109 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
110 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
111 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
112 NETDEVICE_SHOW_RO(type, fmt_dec);
113 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
114
115 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
116 char *buf)
117 {
118 struct net_device *ndev = to_net_dev(dev);
119
120 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
121 }
122 static DEVICE_ATTR_RO(iflink);
123
124 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
125 {
126 return sprintf(buf, fmt_dec, dev->name_assign_type);
127 }
128
129 static ssize_t name_assign_type_show(struct device *dev,
130 struct device_attribute *attr,
131 char *buf)
132 {
133 struct net_device *ndev = to_net_dev(dev);
134 ssize_t ret = -EINVAL;
135
136 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
137 ret = netdev_show(dev, attr, buf, format_name_assign_type);
138
139 return ret;
140 }
141 static DEVICE_ATTR_RO(name_assign_type);
142
143 /* use same locking rules as GIFHWADDR ioctl's */
144 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
145 char *buf)
146 {
147 struct net_device *ndev = to_net_dev(dev);
148 ssize_t ret = -EINVAL;
149
150 read_lock(&dev_base_lock);
151 if (dev_isalive(ndev))
152 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
153 read_unlock(&dev_base_lock);
154 return ret;
155 }
156 static DEVICE_ATTR_RO(address);
157
158 static ssize_t broadcast_show(struct device *dev,
159 struct device_attribute *attr, char *buf)
160 {
161 struct net_device *ndev = to_net_dev(dev);
162 if (dev_isalive(ndev))
163 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
164 return -EINVAL;
165 }
166 static DEVICE_ATTR_RO(broadcast);
167
168 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
169 {
170 if (!netif_running(dev))
171 return -EINVAL;
172 return dev_change_carrier(dev, (bool) new_carrier);
173 }
174
175 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
176 const char *buf, size_t len)
177 {
178 return netdev_store(dev, attr, buf, len, change_carrier);
179 }
180
181 static ssize_t carrier_show(struct device *dev,
182 struct device_attribute *attr, char *buf)
183 {
184 struct net_device *netdev = to_net_dev(dev);
185 if (netif_running(netdev)) {
186 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
187 }
188 return -EINVAL;
189 }
190 static DEVICE_ATTR_RW(carrier);
191
192 static 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 }
210 static DEVICE_ATTR_RO(speed);
211
212 static 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 }
244 static DEVICE_ATTR_RO(duplex);
245
246 static 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 }
256 static DEVICE_ATTR_RO(dormant);
257
258 static const char *const operstates[] = {
259 "unknown",
260 "notpresent", /* currently unused */
261 "down",
262 "lowerlayerdown",
263 "testing", /* currently unused */
264 "dormant",
265 "up"
266 };
267
268 static 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 }
285 static DEVICE_ATTR_RO(operstate);
286
287 static 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 return sprintf(buf, fmt_dec,
293 atomic_read(&netdev->carrier_changes));
294 }
295 static DEVICE_ATTR_RO(carrier_changes);
296
297 /* read-write attributes */
298
299 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
300 {
301 return dev_set_mtu(dev, (int) new_mtu);
302 }
303
304 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
305 const char *buf, size_t len)
306 {
307 return netdev_store(dev, attr, buf, len, change_mtu);
308 }
309 NETDEVICE_SHOW_RW(mtu, fmt_dec);
310
311 static int change_flags(struct net_device *dev, unsigned long new_flags)
312 {
313 return dev_change_flags(dev, (unsigned int) new_flags);
314 }
315
316 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
317 const char *buf, size_t len)
318 {
319 return netdev_store(dev, attr, buf, len, change_flags);
320 }
321 NETDEVICE_SHOW_RW(flags, fmt_hex);
322
323 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
324 {
325 int res, orig_len = dev->tx_queue_len;
326
327 if (new_len != orig_len) {
328 dev->tx_queue_len = new_len;
329 res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev);
330 res = notifier_to_errno(res);
331 if (res) {
332 netdev_err(dev,
333 "refused to change device tx_queue_len\n");
334 dev->tx_queue_len = orig_len;
335 return -EFAULT;
336 }
337 }
338
339 return 0;
340 }
341
342 static ssize_t tx_queue_len_store(struct device *dev,
343 struct device_attribute *attr,
344 const char *buf, size_t len)
345 {
346 if (!capable(CAP_NET_ADMIN))
347 return -EPERM;
348
349 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
350 }
351 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
352
353 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
354 {
355 dev->gro_flush_timeout = val;
356 return 0;
357 }
358
359 static ssize_t gro_flush_timeout_store(struct device *dev,
360 struct device_attribute *attr,
361 const char *buf, size_t len)
362 {
363 if (!capable(CAP_NET_ADMIN))
364 return -EPERM;
365
366 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
367 }
368 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
369
370 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
371 const char *buf, size_t len)
372 {
373 struct net_device *netdev = to_net_dev(dev);
374 struct net *net = dev_net(netdev);
375 size_t count = len;
376 ssize_t ret;
377
378 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
379 return -EPERM;
380
381 /* ignore trailing newline */
382 if (len > 0 && buf[len - 1] == '\n')
383 --count;
384
385 if (!rtnl_trylock())
386 return restart_syscall();
387 ret = dev_set_alias(netdev, buf, count);
388 rtnl_unlock();
389
390 return ret < 0 ? ret : len;
391 }
392
393 static ssize_t ifalias_show(struct device *dev,
394 struct device_attribute *attr, char *buf)
395 {
396 const struct net_device *netdev = to_net_dev(dev);
397 ssize_t ret = 0;
398
399 if (!rtnl_trylock())
400 return restart_syscall();
401 if (netdev->ifalias)
402 ret = sprintf(buf, "%s\n", netdev->ifalias);
403 rtnl_unlock();
404 return ret;
405 }
406 static DEVICE_ATTR_RW(ifalias);
407
408 static int change_group(struct net_device *dev, unsigned long new_group)
409 {
410 dev_set_group(dev, (int) new_group);
411 return 0;
412 }
413
414 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
415 const char *buf, size_t len)
416 {
417 return netdev_store(dev, attr, buf, len, change_group);
418 }
419 NETDEVICE_SHOW(group, fmt_dec);
420 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
421
422 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
423 {
424 return dev_change_proto_down(dev, (bool) proto_down);
425 }
426
427 static ssize_t proto_down_store(struct device *dev,
428 struct device_attribute *attr,
429 const char *buf, size_t len)
430 {
431 return netdev_store(dev, attr, buf, len, change_proto_down);
432 }
433 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
434
435 static ssize_t phys_port_id_show(struct device *dev,
436 struct device_attribute *attr, char *buf)
437 {
438 struct net_device *netdev = to_net_dev(dev);
439 ssize_t ret = -EINVAL;
440
441 if (!rtnl_trylock())
442 return restart_syscall();
443
444 if (dev_isalive(netdev)) {
445 struct netdev_phys_item_id ppid;
446
447 ret = dev_get_phys_port_id(netdev, &ppid);
448 if (!ret)
449 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
450 }
451 rtnl_unlock();
452
453 return ret;
454 }
455 static DEVICE_ATTR_RO(phys_port_id);
456
457 static ssize_t phys_port_name_show(struct device *dev,
458 struct device_attribute *attr, char *buf)
459 {
460 struct net_device *netdev = to_net_dev(dev);
461 ssize_t ret = -EINVAL;
462
463 if (!rtnl_trylock())
464 return restart_syscall();
465
466 if (dev_isalive(netdev)) {
467 char name[IFNAMSIZ];
468
469 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
470 if (!ret)
471 ret = sprintf(buf, "%s\n", name);
472 }
473 rtnl_unlock();
474
475 return ret;
476 }
477 static DEVICE_ATTR_RO(phys_port_name);
478
479 static ssize_t phys_switch_id_show(struct device *dev,
480 struct device_attribute *attr, char *buf)
481 {
482 struct net_device *netdev = to_net_dev(dev);
483 ssize_t ret = -EINVAL;
484
485 if (!rtnl_trylock())
486 return restart_syscall();
487
488 if (dev_isalive(netdev)) {
489 struct switchdev_attr attr = {
490 .orig_dev = netdev,
491 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
492 .flags = SWITCHDEV_F_NO_RECURSE,
493 };
494
495 ret = switchdev_port_attr_get(netdev, &attr);
496 if (!ret)
497 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
498 attr.u.ppid.id);
499 }
500 rtnl_unlock();
501
502 return ret;
503 }
504 static DEVICE_ATTR_RO(phys_switch_id);
505
506 static struct attribute *net_class_attrs[] = {
507 &dev_attr_netdev_group.attr,
508 &dev_attr_type.attr,
509 &dev_attr_dev_id.attr,
510 &dev_attr_dev_port.attr,
511 &dev_attr_iflink.attr,
512 &dev_attr_ifindex.attr,
513 &dev_attr_name_assign_type.attr,
514 &dev_attr_addr_assign_type.attr,
515 &dev_attr_addr_len.attr,
516 &dev_attr_link_mode.attr,
517 &dev_attr_address.attr,
518 &dev_attr_broadcast.attr,
519 &dev_attr_speed.attr,
520 &dev_attr_duplex.attr,
521 &dev_attr_dormant.attr,
522 &dev_attr_operstate.attr,
523 &dev_attr_carrier_changes.attr,
524 &dev_attr_ifalias.attr,
525 &dev_attr_carrier.attr,
526 &dev_attr_mtu.attr,
527 &dev_attr_flags.attr,
528 &dev_attr_tx_queue_len.attr,
529 &dev_attr_gro_flush_timeout.attr,
530 &dev_attr_phys_port_id.attr,
531 &dev_attr_phys_port_name.attr,
532 &dev_attr_phys_switch_id.attr,
533 &dev_attr_proto_down.attr,
534 NULL,
535 };
536 ATTRIBUTE_GROUPS(net_class);
537
538 /* Show a given an attribute in the statistics group */
539 static ssize_t netstat_show(const struct device *d,
540 struct device_attribute *attr, char *buf,
541 unsigned long offset)
542 {
543 struct net_device *dev = to_net_dev(d);
544 ssize_t ret = -EINVAL;
545
546 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
547 offset % sizeof(u64) != 0);
548
549 read_lock(&dev_base_lock);
550 if (dev_isalive(dev)) {
551 struct rtnl_link_stats64 temp;
552 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
553
554 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
555 }
556 read_unlock(&dev_base_lock);
557 return ret;
558 }
559
560 /* generate a read-only statistics attribute */
561 #define NETSTAT_ENTRY(name) \
562 static ssize_t name##_show(struct device *d, \
563 struct device_attribute *attr, char *buf) \
564 { \
565 return netstat_show(d, attr, buf, \
566 offsetof(struct rtnl_link_stats64, name)); \
567 } \
568 static DEVICE_ATTR_RO(name)
569
570 NETSTAT_ENTRY(rx_packets);
571 NETSTAT_ENTRY(tx_packets);
572 NETSTAT_ENTRY(rx_bytes);
573 NETSTAT_ENTRY(tx_bytes);
574 NETSTAT_ENTRY(rx_errors);
575 NETSTAT_ENTRY(tx_errors);
576 NETSTAT_ENTRY(rx_dropped);
577 NETSTAT_ENTRY(tx_dropped);
578 NETSTAT_ENTRY(multicast);
579 NETSTAT_ENTRY(collisions);
580 NETSTAT_ENTRY(rx_length_errors);
581 NETSTAT_ENTRY(rx_over_errors);
582 NETSTAT_ENTRY(rx_crc_errors);
583 NETSTAT_ENTRY(rx_frame_errors);
584 NETSTAT_ENTRY(rx_fifo_errors);
585 NETSTAT_ENTRY(rx_missed_errors);
586 NETSTAT_ENTRY(tx_aborted_errors);
587 NETSTAT_ENTRY(tx_carrier_errors);
588 NETSTAT_ENTRY(tx_fifo_errors);
589 NETSTAT_ENTRY(tx_heartbeat_errors);
590 NETSTAT_ENTRY(tx_window_errors);
591 NETSTAT_ENTRY(rx_compressed);
592 NETSTAT_ENTRY(tx_compressed);
593 NETSTAT_ENTRY(rx_nohandler);
594
595 static struct attribute *netstat_attrs[] = {
596 &dev_attr_rx_packets.attr,
597 &dev_attr_tx_packets.attr,
598 &dev_attr_rx_bytes.attr,
599 &dev_attr_tx_bytes.attr,
600 &dev_attr_rx_errors.attr,
601 &dev_attr_tx_errors.attr,
602 &dev_attr_rx_dropped.attr,
603 &dev_attr_tx_dropped.attr,
604 &dev_attr_multicast.attr,
605 &dev_attr_collisions.attr,
606 &dev_attr_rx_length_errors.attr,
607 &dev_attr_rx_over_errors.attr,
608 &dev_attr_rx_crc_errors.attr,
609 &dev_attr_rx_frame_errors.attr,
610 &dev_attr_rx_fifo_errors.attr,
611 &dev_attr_rx_missed_errors.attr,
612 &dev_attr_tx_aborted_errors.attr,
613 &dev_attr_tx_carrier_errors.attr,
614 &dev_attr_tx_fifo_errors.attr,
615 &dev_attr_tx_heartbeat_errors.attr,
616 &dev_attr_tx_window_errors.attr,
617 &dev_attr_rx_compressed.attr,
618 &dev_attr_tx_compressed.attr,
619 &dev_attr_rx_nohandler.attr,
620 NULL
621 };
622
623
624 static struct attribute_group netstat_group = {
625 .name = "statistics",
626 .attrs = netstat_attrs,
627 };
628
629 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
630 static struct attribute *wireless_attrs[] = {
631 NULL
632 };
633
634 static struct attribute_group wireless_group = {
635 .name = "wireless",
636 .attrs = wireless_attrs,
637 };
638 #endif
639
640 #else /* CONFIG_SYSFS */
641 #define net_class_groups NULL
642 #endif /* CONFIG_SYSFS */
643
644 #ifdef CONFIG_SYSFS
645 #define to_rx_queue_attr(_attr) container_of(_attr, \
646 struct rx_queue_attribute, attr)
647
648 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
649
650 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
651 char *buf)
652 {
653 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
654 struct netdev_rx_queue *queue = to_rx_queue(kobj);
655
656 if (!attribute->show)
657 return -EIO;
658
659 return attribute->show(queue, attribute, buf);
660 }
661
662 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
663 const char *buf, size_t count)
664 {
665 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
666 struct netdev_rx_queue *queue = to_rx_queue(kobj);
667
668 if (!attribute->store)
669 return -EIO;
670
671 return attribute->store(queue, attribute, buf, count);
672 }
673
674 static const struct sysfs_ops rx_queue_sysfs_ops = {
675 .show = rx_queue_attr_show,
676 .store = rx_queue_attr_store,
677 };
678
679 #ifdef CONFIG_RPS
680 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
681 struct rx_queue_attribute *attribute, char *buf)
682 {
683 struct rps_map *map;
684 cpumask_var_t mask;
685 int i, len;
686
687 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
688 return -ENOMEM;
689
690 rcu_read_lock();
691 map = rcu_dereference(queue->rps_map);
692 if (map)
693 for (i = 0; i < map->len; i++)
694 cpumask_set_cpu(map->cpus[i], mask);
695
696 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
697 rcu_read_unlock();
698 free_cpumask_var(mask);
699
700 return len < PAGE_SIZE ? len : -EINVAL;
701 }
702
703 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
704 struct rx_queue_attribute *attribute,
705 const char *buf, size_t len)
706 {
707 struct rps_map *old_map, *map;
708 cpumask_var_t mask;
709 int err, cpu, i;
710 static DEFINE_MUTEX(rps_map_mutex);
711
712 if (!capable(CAP_NET_ADMIN))
713 return -EPERM;
714
715 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
716 return -ENOMEM;
717
718 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
719 if (err) {
720 free_cpumask_var(mask);
721 return err;
722 }
723
724 map = kzalloc(max_t(unsigned int,
725 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
726 GFP_KERNEL);
727 if (!map) {
728 free_cpumask_var(mask);
729 return -ENOMEM;
730 }
731
732 i = 0;
733 for_each_cpu_and(cpu, mask, cpu_online_mask)
734 map->cpus[i++] = cpu;
735
736 if (i)
737 map->len = i;
738 else {
739 kfree(map);
740 map = NULL;
741 }
742
743 mutex_lock(&rps_map_mutex);
744 old_map = rcu_dereference_protected(queue->rps_map,
745 mutex_is_locked(&rps_map_mutex));
746 rcu_assign_pointer(queue->rps_map, map);
747
748 if (map)
749 static_key_slow_inc(&rps_needed);
750 if (old_map)
751 static_key_slow_dec(&rps_needed);
752
753 mutex_unlock(&rps_map_mutex);
754
755 if (old_map)
756 kfree_rcu(old_map, rcu);
757
758 free_cpumask_var(mask);
759 return len;
760 }
761
762 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
763 struct rx_queue_attribute *attr,
764 char *buf)
765 {
766 struct rps_dev_flow_table *flow_table;
767 unsigned long val = 0;
768
769 rcu_read_lock();
770 flow_table = rcu_dereference(queue->rps_flow_table);
771 if (flow_table)
772 val = (unsigned long)flow_table->mask + 1;
773 rcu_read_unlock();
774
775 return sprintf(buf, "%lu\n", val);
776 }
777
778 static void rps_dev_flow_table_release(struct rcu_head *rcu)
779 {
780 struct rps_dev_flow_table *table = container_of(rcu,
781 struct rps_dev_flow_table, rcu);
782 vfree(table);
783 }
784
785 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
786 struct rx_queue_attribute *attr,
787 const char *buf, size_t len)
788 {
789 unsigned long mask, count;
790 struct rps_dev_flow_table *table, *old_table;
791 static DEFINE_SPINLOCK(rps_dev_flow_lock);
792 int rc;
793
794 if (!capable(CAP_NET_ADMIN))
795 return -EPERM;
796
797 rc = kstrtoul(buf, 0, &count);
798 if (rc < 0)
799 return rc;
800
801 if (count) {
802 mask = count - 1;
803 /* mask = roundup_pow_of_two(count) - 1;
804 * without overflows...
805 */
806 while ((mask | (mask >> 1)) != mask)
807 mask |= (mask >> 1);
808 /* On 64 bit arches, must check mask fits in table->mask (u32),
809 * and on 32bit arches, must check
810 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
811 */
812 #if BITS_PER_LONG > 32
813 if (mask > (unsigned long)(u32)mask)
814 return -EINVAL;
815 #else
816 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
817 / sizeof(struct rps_dev_flow)) {
818 /* Enforce a limit to prevent overflow */
819 return -EINVAL;
820 }
821 #endif
822 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
823 if (!table)
824 return -ENOMEM;
825
826 table->mask = mask;
827 for (count = 0; count <= mask; count++)
828 table->flows[count].cpu = RPS_NO_CPU;
829 } else
830 table = NULL;
831
832 spin_lock(&rps_dev_flow_lock);
833 old_table = rcu_dereference_protected(queue->rps_flow_table,
834 lockdep_is_held(&rps_dev_flow_lock));
835 rcu_assign_pointer(queue->rps_flow_table, table);
836 spin_unlock(&rps_dev_flow_lock);
837
838 if (old_table)
839 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
840
841 return len;
842 }
843
844 static struct rx_queue_attribute rps_cpus_attribute =
845 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
846
847
848 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
849 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
850 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
851 #endif /* CONFIG_RPS */
852
853 static struct attribute *rx_queue_default_attrs[] = {
854 #ifdef CONFIG_RPS
855 &rps_cpus_attribute.attr,
856 &rps_dev_flow_table_cnt_attribute.attr,
857 #endif
858 NULL
859 };
860
861 static void rx_queue_release(struct kobject *kobj)
862 {
863 struct netdev_rx_queue *queue = to_rx_queue(kobj);
864 #ifdef CONFIG_RPS
865 struct rps_map *map;
866 struct rps_dev_flow_table *flow_table;
867
868
869 map = rcu_dereference_protected(queue->rps_map, 1);
870 if (map) {
871 RCU_INIT_POINTER(queue->rps_map, NULL);
872 kfree_rcu(map, rcu);
873 }
874
875 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
876 if (flow_table) {
877 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
878 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
879 }
880 #endif
881
882 memset(kobj, 0, sizeof(*kobj));
883 dev_put(queue->dev);
884 }
885
886 static const void *rx_queue_namespace(struct kobject *kobj)
887 {
888 struct netdev_rx_queue *queue = to_rx_queue(kobj);
889 struct device *dev = &queue->dev->dev;
890 const void *ns = NULL;
891
892 if (dev->class && dev->class->ns_type)
893 ns = dev->class->namespace(dev);
894
895 return ns;
896 }
897
898 static struct kobj_type rx_queue_ktype = {
899 .sysfs_ops = &rx_queue_sysfs_ops,
900 .release = rx_queue_release,
901 .default_attrs = rx_queue_default_attrs,
902 .namespace = rx_queue_namespace
903 };
904
905 static int rx_queue_add_kobject(struct net_device *dev, int index)
906 {
907 struct netdev_rx_queue *queue = dev->_rx + index;
908 struct kobject *kobj = &queue->kobj;
909 int error = 0;
910
911 kobj->kset = dev->queues_kset;
912 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
913 "rx-%u", index);
914 if (error)
915 goto exit;
916
917 if (dev->sysfs_rx_queue_group) {
918 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
919 if (error)
920 goto exit;
921 }
922
923 kobject_uevent(kobj, KOBJ_ADD);
924 dev_hold(queue->dev);
925
926 return error;
927 exit:
928 kobject_put(kobj);
929 return error;
930 }
931 #endif /* CONFIG_SYSFS */
932
933 int
934 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
935 {
936 #ifdef CONFIG_SYSFS
937 int i;
938 int error = 0;
939
940 #ifndef CONFIG_RPS
941 if (!dev->sysfs_rx_queue_group)
942 return 0;
943 #endif
944 for (i = old_num; i < new_num; i++) {
945 error = rx_queue_add_kobject(dev, i);
946 if (error) {
947 new_num = old_num;
948 break;
949 }
950 }
951
952 while (--i >= new_num) {
953 if (dev->sysfs_rx_queue_group)
954 sysfs_remove_group(&dev->_rx[i].kobj,
955 dev->sysfs_rx_queue_group);
956 kobject_put(&dev->_rx[i].kobj);
957 }
958
959 return error;
960 #else
961 return 0;
962 #endif
963 }
964
965 #ifdef CONFIG_SYSFS
966 /*
967 * netdev_queue sysfs structures and functions.
968 */
969 struct netdev_queue_attribute {
970 struct attribute attr;
971 ssize_t (*show)(struct netdev_queue *queue,
972 struct netdev_queue_attribute *attr, char *buf);
973 ssize_t (*store)(struct netdev_queue *queue,
974 struct netdev_queue_attribute *attr, const char *buf, size_t len);
975 };
976 #define to_netdev_queue_attr(_attr) container_of(_attr, \
977 struct netdev_queue_attribute, attr)
978
979 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
980
981 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
982 struct attribute *attr, char *buf)
983 {
984 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
985 struct netdev_queue *queue = to_netdev_queue(kobj);
986
987 if (!attribute->show)
988 return -EIO;
989
990 return attribute->show(queue, attribute, buf);
991 }
992
993 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
994 struct attribute *attr,
995 const char *buf, size_t count)
996 {
997 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
998 struct netdev_queue *queue = to_netdev_queue(kobj);
999
1000 if (!attribute->store)
1001 return -EIO;
1002
1003 return attribute->store(queue, attribute, buf, count);
1004 }
1005
1006 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1007 .show = netdev_queue_attr_show,
1008 .store = netdev_queue_attr_store,
1009 };
1010
1011 static ssize_t show_trans_timeout(struct netdev_queue *queue,
1012 struct netdev_queue_attribute *attribute,
1013 char *buf)
1014 {
1015 unsigned long trans_timeout;
1016
1017 spin_lock_irq(&queue->_xmit_lock);
1018 trans_timeout = queue->trans_timeout;
1019 spin_unlock_irq(&queue->_xmit_lock);
1020
1021 return sprintf(buf, "%lu", trans_timeout);
1022 }
1023
1024 #ifdef CONFIG_XPS
1025 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1026 {
1027 struct net_device *dev = queue->dev;
1028 unsigned int i;
1029
1030 i = queue - dev->_tx;
1031 BUG_ON(i >= dev->num_tx_queues);
1032
1033 return i;
1034 }
1035
1036 static ssize_t show_tx_maxrate(struct netdev_queue *queue,
1037 struct netdev_queue_attribute *attribute,
1038 char *buf)
1039 {
1040 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1041 }
1042
1043 static ssize_t set_tx_maxrate(struct netdev_queue *queue,
1044 struct netdev_queue_attribute *attribute,
1045 const char *buf, size_t len)
1046 {
1047 struct net_device *dev = queue->dev;
1048 int err, index = get_netdev_queue_index(queue);
1049 u32 rate = 0;
1050
1051 err = kstrtou32(buf, 10, &rate);
1052 if (err < 0)
1053 return err;
1054
1055 if (!rtnl_trylock())
1056 return restart_syscall();
1057
1058 err = -EOPNOTSUPP;
1059 if (dev->netdev_ops->ndo_set_tx_maxrate)
1060 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1061
1062 rtnl_unlock();
1063 if (!err) {
1064 queue->tx_maxrate = rate;
1065 return len;
1066 }
1067 return err;
1068 }
1069
1070 static struct netdev_queue_attribute queue_tx_maxrate =
1071 __ATTR(tx_maxrate, S_IRUGO | S_IWUSR,
1072 show_tx_maxrate, set_tx_maxrate);
1073 #endif
1074
1075 static struct netdev_queue_attribute queue_trans_timeout =
1076 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
1077
1078 #ifdef CONFIG_BQL
1079 /*
1080 * Byte queue limits sysfs structures and functions.
1081 */
1082 static ssize_t bql_show(char *buf, unsigned int value)
1083 {
1084 return sprintf(buf, "%u\n", value);
1085 }
1086
1087 static ssize_t bql_set(const char *buf, const size_t count,
1088 unsigned int *pvalue)
1089 {
1090 unsigned int value;
1091 int err;
1092
1093 if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
1094 value = DQL_MAX_LIMIT;
1095 else {
1096 err = kstrtouint(buf, 10, &value);
1097 if (err < 0)
1098 return err;
1099 if (value > DQL_MAX_LIMIT)
1100 return -EINVAL;
1101 }
1102
1103 *pvalue = value;
1104
1105 return count;
1106 }
1107
1108 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1109 struct netdev_queue_attribute *attr,
1110 char *buf)
1111 {
1112 struct dql *dql = &queue->dql;
1113
1114 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1115 }
1116
1117 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1118 struct netdev_queue_attribute *attribute,
1119 const char *buf, size_t len)
1120 {
1121 struct dql *dql = &queue->dql;
1122 unsigned int value;
1123 int err;
1124
1125 err = kstrtouint(buf, 10, &value);
1126 if (err < 0)
1127 return err;
1128
1129 dql->slack_hold_time = msecs_to_jiffies(value);
1130
1131 return len;
1132 }
1133
1134 static struct netdev_queue_attribute bql_hold_time_attribute =
1135 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
1136 bql_set_hold_time);
1137
1138 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1139 struct netdev_queue_attribute *attr,
1140 char *buf)
1141 {
1142 struct dql *dql = &queue->dql;
1143
1144 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1145 }
1146
1147 static struct netdev_queue_attribute bql_inflight_attribute =
1148 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1149
1150 #define BQL_ATTR(NAME, FIELD) \
1151 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1152 struct netdev_queue_attribute *attr, \
1153 char *buf) \
1154 { \
1155 return bql_show(buf, queue->dql.FIELD); \
1156 } \
1157 \
1158 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1159 struct netdev_queue_attribute *attr, \
1160 const char *buf, size_t len) \
1161 { \
1162 return bql_set(buf, len, &queue->dql.FIELD); \
1163 } \
1164 \
1165 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \
1166 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \
1167 bql_set_ ## NAME);
1168
1169 BQL_ATTR(limit, limit)
1170 BQL_ATTR(limit_max, max_limit)
1171 BQL_ATTR(limit_min, min_limit)
1172
1173 static struct attribute *dql_attrs[] = {
1174 &bql_limit_attribute.attr,
1175 &bql_limit_max_attribute.attr,
1176 &bql_limit_min_attribute.attr,
1177 &bql_hold_time_attribute.attr,
1178 &bql_inflight_attribute.attr,
1179 NULL
1180 };
1181
1182 static struct attribute_group dql_group = {
1183 .name = "byte_queue_limits",
1184 .attrs = dql_attrs,
1185 };
1186 #endif /* CONFIG_BQL */
1187
1188 #ifdef CONFIG_XPS
1189 static ssize_t show_xps_map(struct netdev_queue *queue,
1190 struct netdev_queue_attribute *attribute, char *buf)
1191 {
1192 struct net_device *dev = queue->dev;
1193 struct xps_dev_maps *dev_maps;
1194 cpumask_var_t mask;
1195 unsigned long index;
1196 int i, len;
1197
1198 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1199 return -ENOMEM;
1200
1201 index = get_netdev_queue_index(queue);
1202
1203 rcu_read_lock();
1204 dev_maps = rcu_dereference(dev->xps_maps);
1205 if (dev_maps) {
1206 for_each_possible_cpu(i) {
1207 struct xps_map *map =
1208 rcu_dereference(dev_maps->cpu_map[i]);
1209 if (map) {
1210 int j;
1211 for (j = 0; j < map->len; j++) {
1212 if (map->queues[j] == index) {
1213 cpumask_set_cpu(i, mask);
1214 break;
1215 }
1216 }
1217 }
1218 }
1219 }
1220 rcu_read_unlock();
1221
1222 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1223 free_cpumask_var(mask);
1224 return len < PAGE_SIZE ? len : -EINVAL;
1225 }
1226
1227 static ssize_t store_xps_map(struct netdev_queue *queue,
1228 struct netdev_queue_attribute *attribute,
1229 const char *buf, size_t len)
1230 {
1231 struct net_device *dev = queue->dev;
1232 unsigned long index;
1233 cpumask_var_t mask;
1234 int err;
1235
1236 if (!capable(CAP_NET_ADMIN))
1237 return -EPERM;
1238
1239 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1240 return -ENOMEM;
1241
1242 index = get_netdev_queue_index(queue);
1243
1244 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1245 if (err) {
1246 free_cpumask_var(mask);
1247 return err;
1248 }
1249
1250 err = netif_set_xps_queue(dev, mask, index);
1251
1252 free_cpumask_var(mask);
1253
1254 return err ? : len;
1255 }
1256
1257 static struct netdev_queue_attribute xps_cpus_attribute =
1258 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1259 #endif /* CONFIG_XPS */
1260
1261 static struct attribute *netdev_queue_default_attrs[] = {
1262 &queue_trans_timeout.attr,
1263 #ifdef CONFIG_XPS
1264 &xps_cpus_attribute.attr,
1265 &queue_tx_maxrate.attr,
1266 #endif
1267 NULL
1268 };
1269
1270 static void netdev_queue_release(struct kobject *kobj)
1271 {
1272 struct netdev_queue *queue = to_netdev_queue(kobj);
1273
1274 memset(kobj, 0, sizeof(*kobj));
1275 dev_put(queue->dev);
1276 }
1277
1278 static const void *netdev_queue_namespace(struct kobject *kobj)
1279 {
1280 struct netdev_queue *queue = to_netdev_queue(kobj);
1281 struct device *dev = &queue->dev->dev;
1282 const void *ns = NULL;
1283
1284 if (dev->class && dev->class->ns_type)
1285 ns = dev->class->namespace(dev);
1286
1287 return ns;
1288 }
1289
1290 static struct kobj_type netdev_queue_ktype = {
1291 .sysfs_ops = &netdev_queue_sysfs_ops,
1292 .release = netdev_queue_release,
1293 .default_attrs = netdev_queue_default_attrs,
1294 .namespace = netdev_queue_namespace,
1295 };
1296
1297 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1298 {
1299 struct netdev_queue *queue = dev->_tx + index;
1300 struct kobject *kobj = &queue->kobj;
1301 int error = 0;
1302
1303 kobj->kset = dev->queues_kset;
1304 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1305 "tx-%u", index);
1306 if (error)
1307 goto exit;
1308
1309 #ifdef CONFIG_BQL
1310 error = sysfs_create_group(kobj, &dql_group);
1311 if (error)
1312 goto exit;
1313 #endif
1314
1315 kobject_uevent(kobj, KOBJ_ADD);
1316 dev_hold(queue->dev);
1317
1318 return 0;
1319 exit:
1320 kobject_put(kobj);
1321 return error;
1322 }
1323 #endif /* CONFIG_SYSFS */
1324
1325 int
1326 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1327 {
1328 #ifdef CONFIG_SYSFS
1329 int i;
1330 int error = 0;
1331
1332 for (i = old_num; i < new_num; i++) {
1333 error = netdev_queue_add_kobject(dev, i);
1334 if (error) {
1335 new_num = old_num;
1336 break;
1337 }
1338 }
1339
1340 while (--i >= new_num) {
1341 struct netdev_queue *queue = dev->_tx + i;
1342
1343 #ifdef CONFIG_BQL
1344 sysfs_remove_group(&queue->kobj, &dql_group);
1345 #endif
1346 kobject_put(&queue->kobj);
1347 }
1348
1349 return error;
1350 #else
1351 return 0;
1352 #endif /* CONFIG_SYSFS */
1353 }
1354
1355 static int register_queue_kobjects(struct net_device *dev)
1356 {
1357 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1358
1359 #ifdef CONFIG_SYSFS
1360 dev->queues_kset = kset_create_and_add("queues",
1361 NULL, &dev->dev.kobj);
1362 if (!dev->queues_kset)
1363 return -ENOMEM;
1364 real_rx = dev->real_num_rx_queues;
1365 #endif
1366 real_tx = dev->real_num_tx_queues;
1367
1368 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1369 if (error)
1370 goto error;
1371 rxq = real_rx;
1372
1373 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1374 if (error)
1375 goto error;
1376 txq = real_tx;
1377
1378 return 0;
1379
1380 error:
1381 netdev_queue_update_kobjects(dev, txq, 0);
1382 net_rx_queue_update_kobjects(dev, rxq, 0);
1383 return error;
1384 }
1385
1386 static void remove_queue_kobjects(struct net_device *dev)
1387 {
1388 int real_rx = 0, real_tx = 0;
1389
1390 #ifdef CONFIG_SYSFS
1391 real_rx = dev->real_num_rx_queues;
1392 #endif
1393 real_tx = dev->real_num_tx_queues;
1394
1395 net_rx_queue_update_kobjects(dev, real_rx, 0);
1396 netdev_queue_update_kobjects(dev, real_tx, 0);
1397 #ifdef CONFIG_SYSFS
1398 kset_unregister(dev->queues_kset);
1399 #endif
1400 }
1401
1402 static bool net_current_may_mount(void)
1403 {
1404 struct net *net = current->nsproxy->net_ns;
1405
1406 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1407 }
1408
1409 static void *net_grab_current_ns(void)
1410 {
1411 struct net *ns = current->nsproxy->net_ns;
1412 #ifdef CONFIG_NET_NS
1413 if (ns)
1414 atomic_inc(&ns->passive);
1415 #endif
1416 return ns;
1417 }
1418
1419 static const void *net_initial_ns(void)
1420 {
1421 return &init_net;
1422 }
1423
1424 static const void *net_netlink_ns(struct sock *sk)
1425 {
1426 return sock_net(sk);
1427 }
1428
1429 struct kobj_ns_type_operations net_ns_type_operations = {
1430 .type = KOBJ_NS_TYPE_NET,
1431 .current_may_mount = net_current_may_mount,
1432 .grab_current_ns = net_grab_current_ns,
1433 .netlink_ns = net_netlink_ns,
1434 .initial_ns = net_initial_ns,
1435 .drop_ns = net_drop_ns,
1436 };
1437 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1438
1439 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1440 {
1441 struct net_device *dev = to_net_dev(d);
1442 int retval;
1443
1444 /* pass interface to uevent. */
1445 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1446 if (retval)
1447 goto exit;
1448
1449 /* pass ifindex to uevent.
1450 * ifindex is useful as it won't change (interface name may change)
1451 * and is what RtNetlink uses natively. */
1452 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1453
1454 exit:
1455 return retval;
1456 }
1457
1458 /*
1459 * netdev_release -- destroy and free a dead device.
1460 * Called when last reference to device kobject is gone.
1461 */
1462 static void netdev_release(struct device *d)
1463 {
1464 struct net_device *dev = to_net_dev(d);
1465
1466 BUG_ON(dev->reg_state != NETREG_RELEASED);
1467
1468 kfree(dev->ifalias);
1469 netdev_freemem(dev);
1470 }
1471
1472 static const void *net_namespace(struct device *d)
1473 {
1474 struct net_device *dev = to_net_dev(d);
1475
1476 return dev_net(dev);
1477 }
1478
1479 static struct class net_class = {
1480 .name = "net",
1481 .dev_release = netdev_release,
1482 .dev_groups = net_class_groups,
1483 .dev_uevent = netdev_uevent,
1484 .ns_type = &net_ns_type_operations,
1485 .namespace = net_namespace,
1486 };
1487
1488 #ifdef CONFIG_OF_NET
1489 static int of_dev_node_match(struct device *dev, const void *data)
1490 {
1491 int ret = 0;
1492
1493 if (dev->parent)
1494 ret = dev->parent->of_node == data;
1495
1496 return ret == 0 ? dev->of_node == data : ret;
1497 }
1498
1499 /*
1500 * of_find_net_device_by_node - lookup the net device for the device node
1501 * @np: OF device node
1502 *
1503 * Looks up the net_device structure corresponding with the device node.
1504 * If successful, returns a pointer to the net_device with the embedded
1505 * struct device refcount incremented by one, or NULL on failure. The
1506 * refcount must be dropped when done with the net_device.
1507 */
1508 struct net_device *of_find_net_device_by_node(struct device_node *np)
1509 {
1510 struct device *dev;
1511
1512 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1513 if (!dev)
1514 return NULL;
1515
1516 return to_net_dev(dev);
1517 }
1518 EXPORT_SYMBOL(of_find_net_device_by_node);
1519 #endif
1520
1521 /* Delete sysfs entries but hold kobject reference until after all
1522 * netdev references are gone.
1523 */
1524 void netdev_unregister_kobject(struct net_device *ndev)
1525 {
1526 struct device *dev = &(ndev->dev);
1527
1528 kobject_get(&dev->kobj);
1529
1530 remove_queue_kobjects(ndev);
1531
1532 pm_runtime_set_memalloc_noio(dev, false);
1533
1534 device_del(dev);
1535 }
1536
1537 /* Create sysfs entries for network device. */
1538 int netdev_register_kobject(struct net_device *ndev)
1539 {
1540 struct device *dev = &(ndev->dev);
1541 const struct attribute_group **groups = ndev->sysfs_groups;
1542 int error = 0;
1543
1544 device_initialize(dev);
1545 dev->class = &net_class;
1546 dev->platform_data = ndev;
1547 dev->groups = groups;
1548
1549 dev_set_name(dev, "%s", ndev->name);
1550
1551 #ifdef CONFIG_SYSFS
1552 /* Allow for a device specific group */
1553 if (*groups)
1554 groups++;
1555
1556 *groups++ = &netstat_group;
1557
1558 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1559 if (ndev->ieee80211_ptr)
1560 *groups++ = &wireless_group;
1561 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1562 else if (ndev->wireless_handlers)
1563 *groups++ = &wireless_group;
1564 #endif
1565 #endif
1566 #endif /* CONFIG_SYSFS */
1567
1568 error = device_add(dev);
1569 if (error)
1570 return error;
1571
1572 error = register_queue_kobjects(ndev);
1573 if (error) {
1574 device_del(dev);
1575 return error;
1576 }
1577
1578 pm_runtime_set_memalloc_noio(dev, true);
1579
1580 return error;
1581 }
1582
1583 int netdev_class_create_file_ns(struct class_attribute *class_attr,
1584 const void *ns)
1585 {
1586 return class_create_file_ns(&net_class, class_attr, ns);
1587 }
1588 EXPORT_SYMBOL(netdev_class_create_file_ns);
1589
1590 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1591 const void *ns)
1592 {
1593 class_remove_file_ns(&net_class, class_attr, ns);
1594 }
1595 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1596
1597 int __init netdev_kobject_init(void)
1598 {
1599 kobj_ns_type_register(&net_ns_type_operations);
1600 return class_register(&net_class);
1601 }
Linux with added FPC-III support