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staging: zcache: include module.h for MODULE_LICENSE
[zen-stable.git] / net / core / net-sysfs.c
blob1683e5db2f27610983f042158b1aea2a071cf465
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
28 static const char fmt_hex[] = "%#x\n";
29 static const char fmt_long_hex[] = "%#lx\n";
30 static const char fmt_dec[] = "%d\n";
31 static const char fmt_udec[] = "%u\n";
32 static const char fmt_ulong[] = "%lu\n";
33 static const char fmt_u64[] = "%llu\n";
34
35 static 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 */
41 static 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) \
58 static ssize_t format_##field(const struct net_device *net, char *buf) \
59 { \
60 return sprintf(buf, format_string, net->field); \
61 } \
62 static 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 */
70 static 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
98 NETDEVICE_SHOW(dev_id, fmt_hex);
99 NETDEVICE_SHOW(addr_assign_type, fmt_dec);
100 NETDEVICE_SHOW(addr_len, fmt_dec);
101 NETDEVICE_SHOW(iflink, fmt_dec);
102 NETDEVICE_SHOW(ifindex, fmt_dec);
103 NETDEVICE_SHOW(type, fmt_dec);
104 NETDEVICE_SHOW(link_mode, fmt_dec);
105
106 /* use same locking rules as GIFHWADDR ioctl's */
107 static 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
120 static 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
129 static 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
139 static 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
157 static 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
176 static 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
187 static const char *const operstates[] = {
188 "unknown",
189 "notpresent", /* currently unused */
190 "down",
191 "lowerlayerdown",
192 "testing", /* currently unused */
193 "dormant",
194 "up"
195 };
196
197 static 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 */
216 NETDEVICE_SHOW(mtu, fmt_dec);
217
218 static int change_mtu(struct net_device *net, unsigned long new_mtu)
219 {
220 return dev_set_mtu(net, (int) new_mtu);
221 }
222
223 static 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
229 NETDEVICE_SHOW(flags, fmt_hex);
230
231 static int change_flags(struct net_device *net, unsigned long new_flags)
232 {
233 return dev_change_flags(net, (unsigned) new_flags);
234 }
235
236 static 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
242 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
243
244 static 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
250 static 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
257 static 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
279 static 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
293 NETDEVICE_SHOW(group, fmt_dec);
294
295 static 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
301 static 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
307 static 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 */
332 static 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) \
355 static 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 } \
361 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
362
363 NETSTAT_ENTRY(rx_packets);
364 NETSTAT_ENTRY(tx_packets);
365 NETSTAT_ENTRY(rx_bytes);
366 NETSTAT_ENTRY(tx_bytes);
367 NETSTAT_ENTRY(rx_errors);
368 NETSTAT_ENTRY(tx_errors);
369 NETSTAT_ENTRY(rx_dropped);
370 NETSTAT_ENTRY(tx_dropped);
371 NETSTAT_ENTRY(multicast);
372 NETSTAT_ENTRY(collisions);
373 NETSTAT_ENTRY(rx_length_errors);
374 NETSTAT_ENTRY(rx_over_errors);
375 NETSTAT_ENTRY(rx_crc_errors);
376 NETSTAT_ENTRY(rx_frame_errors);
377 NETSTAT_ENTRY(rx_fifo_errors);
378 NETSTAT_ENTRY(rx_missed_errors);
379 NETSTAT_ENTRY(tx_aborted_errors);
380 NETSTAT_ENTRY(tx_carrier_errors);
381 NETSTAT_ENTRY(tx_fifo_errors);
382 NETSTAT_ENTRY(tx_heartbeat_errors);
383 NETSTAT_ENTRY(tx_window_errors);
384 NETSTAT_ENTRY(rx_compressed);
385 NETSTAT_ENTRY(tx_compressed);
386
387 static 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
415 static 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 */
422 static 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) \
444 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
445 { \
446 return sprintf(buf, format_string, iw->field); \
447 } \
448 static 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 } \
453 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
454
455 WIRELESS_SHOW(status, status, fmt_hex);
456 WIRELESS_SHOW(link, qual.qual, fmt_dec);
457 WIRELESS_SHOW(level, qual.level, fmt_dec);
458 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
459 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
460 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
461 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
462 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
463 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
464 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
465
466 static 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
480 static 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 */
491 struct 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
503 static 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
515 static 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
527 static const struct sysfs_ops rx_queue_sysfs_ops = {
528 .show = rx_queue_attr_show,
529 .store = rx_queue_attr_store,
530 };
531
532 static 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
562 static 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
615 static 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
631 static 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
639 static 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
648 static 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
694 static struct rx_queue_attribute rps_cpus_attribute =
695 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
696
697
698 static 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
702 static struct attribute *rx_queue_default_attrs[] = {
703 &rps_cpus_attribute.attr,
704 &rps_dev_flow_table_cnt_attribute.attr,
705 NULL
706 };
707
708 static 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
731 static 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
737 static 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
758 int
759 net_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 */
786 struct 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
798 static 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
810 static 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
823 static const struct sysfs_ops netdev_queue_sysfs_ops = {
824 .show = netdev_queue_attr_show,
825 .store = netdev_queue_attr_store,
826 };
827
828 static 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
843 static 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
888 static DEFINE_MUTEX(xps_map_mutex);
889 #define xmap_dereference(P) \
890 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
891
892 static 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
1007 error:
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
1020 static struct netdev_queue_attribute xps_cpus_attribute =
1021 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1022
1023 static struct attribute *netdev_queue_default_attrs[] = {
1024 &xps_cpus_attribute.attr,
1025 NULL
1026 };
1027
1028 static 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
1079 static 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
1085 static 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
1106 int
1107 netdev_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
1130 static 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
1158 error:
1159 netdev_queue_update_kobjects(net, txq, 0);
1160 net_rx_queue_update_kobjects(net, rxq, 0);
1161 return error;
1162 }
1163
1164 static 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
1180 static 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
1190 static const void *net_initial_ns(void)
1191 {
1192 return &init_net;
1193 }
1194
1195 static const void *net_netlink_ns(struct sock *sk)
1196 {
1197 return sock_net(sk);
1198 }
1199
1200 struct 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 };
1207 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1208
1209 #ifdef CONFIG_HOTPLUG
1210 static 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
1225 exit:
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 */
1234 static 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
1244 static 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
1251 static 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 */
1267 void 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. */
1279 int 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
1321 int netdev_class_create_file(struct class_attribute *class_attr)
1322 {
1323 return class_create_file(&net_class, class_attr);
1324 }
1325 EXPORT_SYMBOL(netdev_class_create_file);
1326
1327 void netdev_class_remove_file(struct class_attribute *class_attr)
1328 {
1329 class_remove_file(&net_class, class_attr);
1330 }
1331 EXPORT_SYMBOL(netdev_class_remove_file);
1332
1333 int netdev_kobject_init(void)
1334 {
1335 kobj_ns_type_register(&net_ns_type_operations);
1336 return class_register(&net_class);
1337 }