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xfs: remove xfs_qm_sync
[linux-2.6.git] / net / core / net-sysfs.c
blobc71c434a4c053e440dc816682d944c521e05c50f
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 <linux/export.h>
24 #include <net/wext.h>
25
26 #include "net-sysfs.h"
27
28 #ifdef CONFIG_SYSFS
29 static const char fmt_hex[] = "%#x\n";
30 static const char fmt_long_hex[] = "%#lx\n";
31 static const char fmt_dec[] = "%d\n";
32 static const char fmt_udec[] = "%u\n";
33 static const char fmt_ulong[] = "%lu\n";
34 static const char fmt_u64[] = "%llu\n";
35
36 static inline int dev_isalive(const struct net_device *dev)
37 {
38 return dev->reg_state <= NETREG_REGISTERED;
39 }
40
41 /* use same locking rules as GIF* ioctl's */
42 static ssize_t netdev_show(const struct device *dev,
43 struct device_attribute *attr, char *buf,
44 ssize_t (*format)(const struct net_device *, char *))
45 {
46 struct net_device *net = to_net_dev(dev);
47 ssize_t ret = -EINVAL;
48
49 read_lock(&dev_base_lock);
50 if (dev_isalive(net))
51 ret = (*format)(net, buf);
52 read_unlock(&dev_base_lock);
53
54 return ret;
55 }
56
57 /* generate a show function for simple field */
58 #define NETDEVICE_SHOW(field, format_string) \
59 static ssize_t format_##field(const struct net_device *net, char *buf) \
60 { \
61 return sprintf(buf, format_string, net->field); \
62 } \
63 static ssize_t show_##field(struct device *dev, \
64 struct device_attribute *attr, char *buf) \
65 { \
66 return netdev_show(dev, attr, buf, format_##field); \
67 }
68
69
70 /* use same locking and permission rules as SIF* ioctl's */
71 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
72 const char *buf, size_t len,
73 int (*set)(struct net_device *, unsigned long))
74 {
75 struct net_device *net = to_net_dev(dev);
76 char *endp;
77 unsigned long new;
78 int ret = -EINVAL;
79
80 if (!capable(CAP_NET_ADMIN))
81 return -EPERM;
82
83 new = simple_strtoul(buf, &endp, 0);
84 if (endp == buf)
85 goto err;
86
87 if (!rtnl_trylock())
88 return restart_syscall();
89
90 if (dev_isalive(net)) {
91 if ((ret = (*set)(net, new)) == 0)
92 ret = len;
93 }
94 rtnl_unlock();
95 err:
96 return ret;
97 }
98
99 NETDEVICE_SHOW(dev_id, fmt_hex);
100 NETDEVICE_SHOW(addr_assign_type, fmt_dec);
101 NETDEVICE_SHOW(addr_len, fmt_dec);
102 NETDEVICE_SHOW(iflink, fmt_dec);
103 NETDEVICE_SHOW(ifindex, fmt_dec);
104 NETDEVICE_SHOW(type, fmt_dec);
105 NETDEVICE_SHOW(link_mode, fmt_dec);
106
107 /* use same locking rules as GIFHWADDR ioctl's */
108 static ssize_t show_address(struct device *dev, struct device_attribute *attr,
109 char *buf)
110 {
111 struct net_device *net = to_net_dev(dev);
112 ssize_t ret = -EINVAL;
113
114 read_lock(&dev_base_lock);
115 if (dev_isalive(net))
116 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
117 read_unlock(&dev_base_lock);
118 return ret;
119 }
120
121 static ssize_t show_broadcast(struct device *dev,
122 struct device_attribute *attr, char *buf)
123 {
124 struct net_device *net = to_net_dev(dev);
125 if (dev_isalive(net))
126 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
127 return -EINVAL;
128 }
129
130 static ssize_t show_carrier(struct device *dev,
131 struct device_attribute *attr, char *buf)
132 {
133 struct net_device *netdev = to_net_dev(dev);
134 if (netif_running(netdev)) {
135 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
136 }
137 return -EINVAL;
138 }
139
140 static ssize_t show_speed(struct device *dev,
141 struct device_attribute *attr, char *buf)
142 {
143 struct net_device *netdev = to_net_dev(dev);
144 int ret = -EINVAL;
145
146 if (!rtnl_trylock())
147 return restart_syscall();
148
149 if (netif_running(netdev)) {
150 struct ethtool_cmd cmd;
151 if (!__ethtool_get_settings(netdev, &cmd))
152 ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
153 }
154 rtnl_unlock();
155 return ret;
156 }
157
158 static ssize_t show_duplex(struct device *dev,
159 struct device_attribute *attr, char *buf)
160 {
161 struct net_device *netdev = to_net_dev(dev);
162 int ret = -EINVAL;
163
164 if (!rtnl_trylock())
165 return restart_syscall();
166
167 if (netif_running(netdev)) {
168 struct ethtool_cmd cmd;
169 if (!__ethtool_get_settings(netdev, &cmd))
170 ret = sprintf(buf, "%s\n",
171 cmd.duplex ? "full" : "half");
172 }
173 rtnl_unlock();
174 return ret;
175 }
176
177 static ssize_t show_dormant(struct device *dev,
178 struct device_attribute *attr, char *buf)
179 {
180 struct net_device *netdev = to_net_dev(dev);
181
182 if (netif_running(netdev))
183 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
184
185 return -EINVAL;
186 }
187
188 static const char *const operstates[] = {
189 "unknown",
190 "notpresent", /* currently unused */
191 "down",
192 "lowerlayerdown",
193 "testing", /* currently unused */
194 "dormant",
195 "up"
196 };
197
198 static ssize_t show_operstate(struct device *dev,
199 struct device_attribute *attr, char *buf)
200 {
201 const struct net_device *netdev = to_net_dev(dev);
202 unsigned char operstate;
203
204 read_lock(&dev_base_lock);
205 operstate = netdev->operstate;
206 if (!netif_running(netdev))
207 operstate = IF_OPER_DOWN;
208 read_unlock(&dev_base_lock);
209
210 if (operstate >= ARRAY_SIZE(operstates))
211 return -EINVAL; /* should not happen */
212
213 return sprintf(buf, "%s\n", operstates[operstate]);
214 }
215
216 /* read-write attributes */
217 NETDEVICE_SHOW(mtu, fmt_dec);
218
219 static int change_mtu(struct net_device *net, unsigned long new_mtu)
220 {
221 return dev_set_mtu(net, (int) new_mtu);
222 }
223
224 static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
225 const char *buf, size_t len)
226 {
227 return netdev_store(dev, attr, buf, len, change_mtu);
228 }
229
230 NETDEVICE_SHOW(flags, fmt_hex);
231
232 static int change_flags(struct net_device *net, unsigned long new_flags)
233 {
234 return dev_change_flags(net, (unsigned) new_flags);
235 }
236
237 static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
238 const char *buf, size_t len)
239 {
240 return netdev_store(dev, attr, buf, len, change_flags);
241 }
242
243 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
244
245 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
246 {
247 net->tx_queue_len = new_len;
248 return 0;
249 }
250
251 static ssize_t store_tx_queue_len(struct device *dev,
252 struct device_attribute *attr,
253 const char *buf, size_t len)
254 {
255 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
256 }
257
258 static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
259 const char *buf, size_t len)
260 {
261 struct net_device *netdev = to_net_dev(dev);
262 size_t count = len;
263 ssize_t ret;
264
265 if (!capable(CAP_NET_ADMIN))
266 return -EPERM;
267
268 /* ignore trailing newline */
269 if (len > 0 && buf[len - 1] == '\n')
270 --count;
271
272 if (!rtnl_trylock())
273 return restart_syscall();
274 ret = dev_set_alias(netdev, buf, count);
275 rtnl_unlock();
276
277 return ret < 0 ? ret : len;
278 }
279
280 static ssize_t show_ifalias(struct device *dev,
281 struct device_attribute *attr, char *buf)
282 {
283 const struct net_device *netdev = to_net_dev(dev);
284 ssize_t ret = 0;
285
286 if (!rtnl_trylock())
287 return restart_syscall();
288 if (netdev->ifalias)
289 ret = sprintf(buf, "%s\n", netdev->ifalias);
290 rtnl_unlock();
291 return ret;
292 }
293
294 NETDEVICE_SHOW(group, fmt_dec);
295
296 static int change_group(struct net_device *net, unsigned long new_group)
297 {
298 dev_set_group(net, (int) new_group);
299 return 0;
300 }
301
302 static ssize_t store_group(struct device *dev, struct device_attribute *attr,
303 const char *buf, size_t len)
304 {
305 return netdev_store(dev, attr, buf, len, change_group);
306 }
307
308 static struct device_attribute net_class_attributes[] = {
309 __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
310 __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
311 __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
312 __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
313 __ATTR(iflink, S_IRUGO, show_iflink, NULL),
314 __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
315 __ATTR(type, S_IRUGO, show_type, NULL),
316 __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
317 __ATTR(address, S_IRUGO, show_address, NULL),
318 __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
319 __ATTR(carrier, S_IRUGO, show_carrier, NULL),
320 __ATTR(speed, S_IRUGO, show_speed, NULL),
321 __ATTR(duplex, S_IRUGO, show_duplex, NULL),
322 __ATTR(dormant, S_IRUGO, show_dormant, NULL),
323 __ATTR(operstate, S_IRUGO, show_operstate, NULL),
324 __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
325 __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
326 __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
327 store_tx_queue_len),
328 __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
329 {}
330 };
331
332 /* Show a given an attribute in the statistics group */
333 static ssize_t netstat_show(const struct device *d,
334 struct device_attribute *attr, char *buf,
335 unsigned long offset)
336 {
337 struct net_device *dev = to_net_dev(d);
338 ssize_t ret = -EINVAL;
339
340 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
341 offset % sizeof(u64) != 0);
342
343 read_lock(&dev_base_lock);
344 if (dev_isalive(dev)) {
345 struct rtnl_link_stats64 temp;
346 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
347
348 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
349 }
350 read_unlock(&dev_base_lock);
351 return ret;
352 }
353
354 /* generate a read-only statistics attribute */
355 #define NETSTAT_ENTRY(name) \
356 static ssize_t show_##name(struct device *d, \
357 struct device_attribute *attr, char *buf) \
358 { \
359 return netstat_show(d, attr, buf, \
360 offsetof(struct rtnl_link_stats64, name)); \
361 } \
362 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
363
364 NETSTAT_ENTRY(rx_packets);
365 NETSTAT_ENTRY(tx_packets);
366 NETSTAT_ENTRY(rx_bytes);
367 NETSTAT_ENTRY(tx_bytes);
368 NETSTAT_ENTRY(rx_errors);
369 NETSTAT_ENTRY(tx_errors);
370 NETSTAT_ENTRY(rx_dropped);
371 NETSTAT_ENTRY(tx_dropped);
372 NETSTAT_ENTRY(multicast);
373 NETSTAT_ENTRY(collisions);
374 NETSTAT_ENTRY(rx_length_errors);
375 NETSTAT_ENTRY(rx_over_errors);
376 NETSTAT_ENTRY(rx_crc_errors);
377 NETSTAT_ENTRY(rx_frame_errors);
378 NETSTAT_ENTRY(rx_fifo_errors);
379 NETSTAT_ENTRY(rx_missed_errors);
380 NETSTAT_ENTRY(tx_aborted_errors);
381 NETSTAT_ENTRY(tx_carrier_errors);
382 NETSTAT_ENTRY(tx_fifo_errors);
383 NETSTAT_ENTRY(tx_heartbeat_errors);
384 NETSTAT_ENTRY(tx_window_errors);
385 NETSTAT_ENTRY(rx_compressed);
386 NETSTAT_ENTRY(tx_compressed);
387
388 static struct attribute *netstat_attrs[] = {
389 &dev_attr_rx_packets.attr,
390 &dev_attr_tx_packets.attr,
391 &dev_attr_rx_bytes.attr,
392 &dev_attr_tx_bytes.attr,
393 &dev_attr_rx_errors.attr,
394 &dev_attr_tx_errors.attr,
395 &dev_attr_rx_dropped.attr,
396 &dev_attr_tx_dropped.attr,
397 &dev_attr_multicast.attr,
398 &dev_attr_collisions.attr,
399 &dev_attr_rx_length_errors.attr,
400 &dev_attr_rx_over_errors.attr,
401 &dev_attr_rx_crc_errors.attr,
402 &dev_attr_rx_frame_errors.attr,
403 &dev_attr_rx_fifo_errors.attr,
404 &dev_attr_rx_missed_errors.attr,
405 &dev_attr_tx_aborted_errors.attr,
406 &dev_attr_tx_carrier_errors.attr,
407 &dev_attr_tx_fifo_errors.attr,
408 &dev_attr_tx_heartbeat_errors.attr,
409 &dev_attr_tx_window_errors.attr,
410 &dev_attr_rx_compressed.attr,
411 &dev_attr_tx_compressed.attr,
412 NULL
413 };
414
415
416 static struct attribute_group netstat_group = {
417 .name = "statistics",
418 .attrs = netstat_attrs,
419 };
420
421 #ifdef CONFIG_WIRELESS_EXT_SYSFS
422 /* helper function that does all the locking etc for wireless stats */
423 static ssize_t wireless_show(struct device *d, char *buf,
424 ssize_t (*format)(const struct iw_statistics *,
425 char *))
426 {
427 struct net_device *dev = to_net_dev(d);
428 const struct iw_statistics *iw;
429 ssize_t ret = -EINVAL;
430
431 if (!rtnl_trylock())
432 return restart_syscall();
433 if (dev_isalive(dev)) {
434 iw = get_wireless_stats(dev);
435 if (iw)
436 ret = (*format)(iw, buf);
437 }
438 rtnl_unlock();
439
440 return ret;
441 }
442
443 /* show function template for wireless fields */
444 #define WIRELESS_SHOW(name, field, format_string) \
445 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
446 { \
447 return sprintf(buf, format_string, iw->field); \
448 } \
449 static ssize_t show_iw_##name(struct device *d, \
450 struct device_attribute *attr, char *buf) \
451 { \
452 return wireless_show(d, buf, format_iw_##name); \
453 } \
454 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
455
456 WIRELESS_SHOW(status, status, fmt_hex);
457 WIRELESS_SHOW(link, qual.qual, fmt_dec);
458 WIRELESS_SHOW(level, qual.level, fmt_dec);
459 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
460 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
461 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
462 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
463 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
464 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
465 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
466
467 static struct attribute *wireless_attrs[] = {
468 &dev_attr_status.attr,
469 &dev_attr_link.attr,
470 &dev_attr_level.attr,
471 &dev_attr_noise.attr,
472 &dev_attr_nwid.attr,
473 &dev_attr_crypt.attr,
474 &dev_attr_fragment.attr,
475 &dev_attr_retries.attr,
476 &dev_attr_misc.attr,
477 &dev_attr_beacon.attr,
478 NULL
479 };
480
481 static struct attribute_group wireless_group = {
482 .name = "wireless",
483 .attrs = wireless_attrs,
484 };
485 #endif
486 #endif /* CONFIG_SYSFS */
487
488 #ifdef CONFIG_RPS
489 /*
490 * RX queue sysfs structures and functions.
491 */
492 struct rx_queue_attribute {
493 struct attribute attr;
494 ssize_t (*show)(struct netdev_rx_queue *queue,
495 struct rx_queue_attribute *attr, char *buf);
496 ssize_t (*store)(struct netdev_rx_queue *queue,
497 struct rx_queue_attribute *attr, const char *buf, size_t len);
498 };
499 #define to_rx_queue_attr(_attr) container_of(_attr, \
500 struct rx_queue_attribute, attr)
501
502 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
503
504 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
505 char *buf)
506 {
507 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
508 struct netdev_rx_queue *queue = to_rx_queue(kobj);
509
510 if (!attribute->show)
511 return -EIO;
512
513 return attribute->show(queue, attribute, buf);
514 }
515
516 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
517 const char *buf, size_t count)
518 {
519 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
520 struct netdev_rx_queue *queue = to_rx_queue(kobj);
521
522 if (!attribute->store)
523 return -EIO;
524
525 return attribute->store(queue, attribute, buf, count);
526 }
527
528 static const struct sysfs_ops rx_queue_sysfs_ops = {
529 .show = rx_queue_attr_show,
530 .store = rx_queue_attr_store,
531 };
532
533 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
534 struct rx_queue_attribute *attribute, char *buf)
535 {
536 struct rps_map *map;
537 cpumask_var_t mask;
538 size_t len = 0;
539 int i;
540
541 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
542 return -ENOMEM;
543
544 rcu_read_lock();
545 map = rcu_dereference(queue->rps_map);
546 if (map)
547 for (i = 0; i < map->len; i++)
548 cpumask_set_cpu(map->cpus[i], mask);
549
550 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
551 if (PAGE_SIZE - len < 3) {
552 rcu_read_unlock();
553 free_cpumask_var(mask);
554 return -EINVAL;
555 }
556 rcu_read_unlock();
557
558 free_cpumask_var(mask);
559 len += sprintf(buf + len, "\n");
560 return len;
561 }
562
563 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
564 struct rx_queue_attribute *attribute,
565 const char *buf, size_t len)
566 {
567 struct rps_map *old_map, *map;
568 cpumask_var_t mask;
569 int err, cpu, i;
570 static DEFINE_SPINLOCK(rps_map_lock);
571
572 if (!capable(CAP_NET_ADMIN))
573 return -EPERM;
574
575 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
576 return -ENOMEM;
577
578 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
579 if (err) {
580 free_cpumask_var(mask);
581 return err;
582 }
583
584 map = kzalloc(max_t(unsigned,
585 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
586 GFP_KERNEL);
587 if (!map) {
588 free_cpumask_var(mask);
589 return -ENOMEM;
590 }
591
592 i = 0;
593 for_each_cpu_and(cpu, mask, cpu_online_mask)
594 map->cpus[i++] = cpu;
595
596 if (i)
597 map->len = i;
598 else {
599 kfree(map);
600 map = NULL;
601 }
602
603 spin_lock(&rps_map_lock);
604 old_map = rcu_dereference_protected(queue->rps_map,
605 lockdep_is_held(&rps_map_lock));
606 rcu_assign_pointer(queue->rps_map, map);
607 spin_unlock(&rps_map_lock);
608
609 if (old_map)
610 kfree_rcu(old_map, rcu);
611
612 free_cpumask_var(mask);
613 return len;
614 }
615
616 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
617 struct rx_queue_attribute *attr,
618 char *buf)
619 {
620 struct rps_dev_flow_table *flow_table;
621 unsigned int val = 0;
622
623 rcu_read_lock();
624 flow_table = rcu_dereference(queue->rps_flow_table);
625 if (flow_table)
626 val = flow_table->mask + 1;
627 rcu_read_unlock();
628
629 return sprintf(buf, "%u\n", val);
630 }
631
632 static void rps_dev_flow_table_release_work(struct work_struct *work)
633 {
634 struct rps_dev_flow_table *table = container_of(work,
635 struct rps_dev_flow_table, free_work);
636
637 vfree(table);
638 }
639
640 static void rps_dev_flow_table_release(struct rcu_head *rcu)
641 {
642 struct rps_dev_flow_table *table = container_of(rcu,
643 struct rps_dev_flow_table, rcu);
644
645 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
646 schedule_work(&table->free_work);
647 }
648
649 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
650 struct rx_queue_attribute *attr,
651 const char *buf, size_t len)
652 {
653 unsigned int count;
654 char *endp;
655 struct rps_dev_flow_table *table, *old_table;
656 static DEFINE_SPINLOCK(rps_dev_flow_lock);
657
658 if (!capable(CAP_NET_ADMIN))
659 return -EPERM;
660
661 count = simple_strtoul(buf, &endp, 0);
662 if (endp == buf)
663 return -EINVAL;
664
665 if (count) {
666 int i;
667
668 if (count > 1<<30) {
669 /* Enforce a limit to prevent overflow */
670 return -EINVAL;
671 }
672 count = roundup_pow_of_two(count);
673 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
674 if (!table)
675 return -ENOMEM;
676
677 table->mask = count - 1;
678 for (i = 0; i < count; i++)
679 table->flows[i].cpu = RPS_NO_CPU;
680 } else
681 table = NULL;
682
683 spin_lock(&rps_dev_flow_lock);
684 old_table = rcu_dereference_protected(queue->rps_flow_table,
685 lockdep_is_held(&rps_dev_flow_lock));
686 rcu_assign_pointer(queue->rps_flow_table, table);
687 spin_unlock(&rps_dev_flow_lock);
688
689 if (old_table)
690 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
691
692 return len;
693 }
694
695 static struct rx_queue_attribute rps_cpus_attribute =
696 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
697
698
699 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
700 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
701 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
702
703 static struct attribute *rx_queue_default_attrs[] = {
704 &rps_cpus_attribute.attr,
705 &rps_dev_flow_table_cnt_attribute.attr,
706 NULL
707 };
708
709 static void rx_queue_release(struct kobject *kobj)
710 {
711 struct netdev_rx_queue *queue = to_rx_queue(kobj);
712 struct rps_map *map;
713 struct rps_dev_flow_table *flow_table;
714
715
716 map = rcu_dereference_protected(queue->rps_map, 1);
717 if (map) {
718 RCU_INIT_POINTER(queue->rps_map, NULL);
719 kfree_rcu(map, rcu);
720 }
721
722 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
723 if (flow_table) {
724 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
725 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
726 }
727
728 memset(kobj, 0, sizeof(*kobj));
729 dev_put(queue->dev);
730 }
731
732 static struct kobj_type rx_queue_ktype = {
733 .sysfs_ops = &rx_queue_sysfs_ops,
734 .release = rx_queue_release,
735 .default_attrs = rx_queue_default_attrs,
736 };
737
738 static int rx_queue_add_kobject(struct net_device *net, int index)
739 {
740 struct netdev_rx_queue *queue = net->_rx + index;
741 struct kobject *kobj = &queue->kobj;
742 int error = 0;
743
744 kobj->kset = net->queues_kset;
745 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
746 "rx-%u", index);
747 if (error) {
748 kobject_put(kobj);
749 return error;
750 }
751
752 kobject_uevent(kobj, KOBJ_ADD);
753 dev_hold(queue->dev);
754
755 return error;
756 }
757 #endif /* CONFIG_RPS */
758
759 int
760 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
761 {
762 #ifdef CONFIG_RPS
763 int i;
764 int error = 0;
765
766 for (i = old_num; i < new_num; i++) {
767 error = rx_queue_add_kobject(net, i);
768 if (error) {
769 new_num = old_num;
770 break;
771 }
772 }
773
774 while (--i >= new_num)
775 kobject_put(&net->_rx[i].kobj);
776
777 return error;
778 #else
779 return 0;
780 #endif
781 }
782
783 #ifdef CONFIG_XPS
784 /*
785 * netdev_queue sysfs structures and functions.
786 */
787 struct netdev_queue_attribute {
788 struct attribute attr;
789 ssize_t (*show)(struct netdev_queue *queue,
790 struct netdev_queue_attribute *attr, char *buf);
791 ssize_t (*store)(struct netdev_queue *queue,
792 struct netdev_queue_attribute *attr, const char *buf, size_t len);
793 };
794 #define to_netdev_queue_attr(_attr) container_of(_attr, \
795 struct netdev_queue_attribute, attr)
796
797 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
798
799 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
800 struct attribute *attr, char *buf)
801 {
802 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
803 struct netdev_queue *queue = to_netdev_queue(kobj);
804
805 if (!attribute->show)
806 return -EIO;
807
808 return attribute->show(queue, attribute, buf);
809 }
810
811 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
812 struct attribute *attr,
813 const char *buf, size_t count)
814 {
815 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
816 struct netdev_queue *queue = to_netdev_queue(kobj);
817
818 if (!attribute->store)
819 return -EIO;
820
821 return attribute->store(queue, attribute, buf, count);
822 }
823
824 static const struct sysfs_ops netdev_queue_sysfs_ops = {
825 .show = netdev_queue_attr_show,
826 .store = netdev_queue_attr_store,
827 };
828
829 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
830 {
831 struct net_device *dev = queue->dev;
832 int i;
833
834 for (i = 0; i < dev->num_tx_queues; i++)
835 if (queue == &dev->_tx[i])
836 break;
837
838 BUG_ON(i >= dev->num_tx_queues);
839
840 return i;
841 }
842
843
844 static ssize_t show_xps_map(struct netdev_queue *queue,
845 struct netdev_queue_attribute *attribute, char *buf)
846 {
847 struct net_device *dev = queue->dev;
848 struct xps_dev_maps *dev_maps;
849 cpumask_var_t mask;
850 unsigned long index;
851 size_t len = 0;
852 int i;
853
854 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
855 return -ENOMEM;
856
857 index = get_netdev_queue_index(queue);
858
859 rcu_read_lock();
860 dev_maps = rcu_dereference(dev->xps_maps);
861 if (dev_maps) {
862 for_each_possible_cpu(i) {
863 struct xps_map *map =
864 rcu_dereference(dev_maps->cpu_map[i]);
865 if (map) {
866 int j;
867 for (j = 0; j < map->len; j++) {
868 if (map->queues[j] == index) {
869 cpumask_set_cpu(i, mask);
870 break;
871 }
872 }
873 }
874 }
875 }
876 rcu_read_unlock();
877
878 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
879 if (PAGE_SIZE - len < 3) {
880 free_cpumask_var(mask);
881 return -EINVAL;
882 }
883
884 free_cpumask_var(mask);
885 len += sprintf(buf + len, "\n");
886 return len;
887 }
888
889 static DEFINE_MUTEX(xps_map_mutex);
890 #define xmap_dereference(P) \
891 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
892
893 static ssize_t store_xps_map(struct netdev_queue *queue,
894 struct netdev_queue_attribute *attribute,
895 const char *buf, size_t len)
896 {
897 struct net_device *dev = queue->dev;
898 cpumask_var_t mask;
899 int err, i, cpu, pos, map_len, alloc_len, need_set;
900 unsigned long index;
901 struct xps_map *map, *new_map;
902 struct xps_dev_maps *dev_maps, *new_dev_maps;
903 int nonempty = 0;
904 int numa_node = -2;
905
906 if (!capable(CAP_NET_ADMIN))
907 return -EPERM;
908
909 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
910 return -ENOMEM;
911
912 index = get_netdev_queue_index(queue);
913
914 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
915 if (err) {
916 free_cpumask_var(mask);
917 return err;
918 }
919
920 new_dev_maps = kzalloc(max_t(unsigned,
921 XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
922 if (!new_dev_maps) {
923 free_cpumask_var(mask);
924 return -ENOMEM;
925 }
926
927 mutex_lock(&xps_map_mutex);
928
929 dev_maps = xmap_dereference(dev->xps_maps);
930
931 for_each_possible_cpu(cpu) {
932 map = dev_maps ?
933 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
934 new_map = map;
935 if (map) {
936 for (pos = 0; pos < map->len; pos++)
937 if (map->queues[pos] == index)
938 break;
939 map_len = map->len;
940 alloc_len = map->alloc_len;
941 } else
942 pos = map_len = alloc_len = 0;
943
944 need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu);
945 #ifdef CONFIG_NUMA
946 if (need_set) {
947 if (numa_node == -2)
948 numa_node = cpu_to_node(cpu);
949 else if (numa_node != cpu_to_node(cpu))
950 numa_node = -1;
951 }
952 #endif
953 if (need_set && pos >= map_len) {
954 /* Need to add queue to this CPU's map */
955 if (map_len >= alloc_len) {
956 alloc_len = alloc_len ?
957 2 * alloc_len : XPS_MIN_MAP_ALLOC;
958 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
959 GFP_KERNEL,
960 cpu_to_node(cpu));
961 if (!new_map)
962 goto error;
963 new_map->alloc_len = alloc_len;
964 for (i = 0; i < map_len; i++)
965 new_map->queues[i] = map->queues[i];
966 new_map->len = map_len;
967 }
968 new_map->queues[new_map->len++] = index;
969 } else if (!need_set && pos < map_len) {
970 /* Need to remove queue from this CPU's map */
971 if (map_len > 1)
972 new_map->queues[pos] =
973 new_map->queues[--new_map->len];
974 else
975 new_map = NULL;
976 }
977 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
978 }
979
980 /* Cleanup old maps */
981 for_each_possible_cpu(cpu) {
982 map = dev_maps ?
983 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
984 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
985 kfree_rcu(map, rcu);
986 if (new_dev_maps->cpu_map[cpu])
987 nonempty = 1;
988 }
989
990 if (nonempty)
991 RCU_INIT_POINTER(dev->xps_maps, new_dev_maps);
992 else {
993 kfree(new_dev_maps);
994 RCU_INIT_POINTER(dev->xps_maps, NULL);
995 }
996
997 if (dev_maps)
998 kfree_rcu(dev_maps, rcu);
999
1000 netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node :
1001 NUMA_NO_NODE);
1002
1003 mutex_unlock(&xps_map_mutex);
1004
1005 free_cpumask_var(mask);
1006 return len;
1007
1008 error:
1009 mutex_unlock(&xps_map_mutex);
1010
1011 if (new_dev_maps)
1012 for_each_possible_cpu(i)
1013 kfree(rcu_dereference_protected(
1014 new_dev_maps->cpu_map[i],
1015 1));
1016 kfree(new_dev_maps);
1017 free_cpumask_var(mask);
1018 return -ENOMEM;
1019 }
1020
1021 static struct netdev_queue_attribute xps_cpus_attribute =
1022 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1023
1024 static struct attribute *netdev_queue_default_attrs[] = {
1025 &xps_cpus_attribute.attr,
1026 NULL
1027 };
1028
1029 static void netdev_queue_release(struct kobject *kobj)
1030 {
1031 struct netdev_queue *queue = to_netdev_queue(kobj);
1032 struct net_device *dev = queue->dev;
1033 struct xps_dev_maps *dev_maps;
1034 struct xps_map *map;
1035 unsigned long index;
1036 int i, pos, nonempty = 0;
1037
1038 index = get_netdev_queue_index(queue);
1039
1040 mutex_lock(&xps_map_mutex);
1041 dev_maps = xmap_dereference(dev->xps_maps);
1042
1043 if (dev_maps) {
1044 for_each_possible_cpu(i) {
1045 map = xmap_dereference(dev_maps->cpu_map[i]);
1046 if (!map)
1047 continue;
1048
1049 for (pos = 0; pos < map->len; pos++)
1050 if (map->queues[pos] == index)
1051 break;
1052
1053 if (pos < map->len) {
1054 if (map->len > 1)
1055 map->queues[pos] =
1056 map->queues[--map->len];
1057 else {
1058 RCU_INIT_POINTER(dev_maps->cpu_map[i],
1059 NULL);
1060 kfree_rcu(map, rcu);
1061 map = NULL;
1062 }
1063 }
1064 if (map)
1065 nonempty = 1;
1066 }
1067
1068 if (!nonempty) {
1069 RCU_INIT_POINTER(dev->xps_maps, NULL);
1070 kfree_rcu(dev_maps, rcu);
1071 }
1072 }
1073
1074 mutex_unlock(&xps_map_mutex);
1075
1076 memset(kobj, 0, sizeof(*kobj));
1077 dev_put(queue->dev);
1078 }
1079
1080 static struct kobj_type netdev_queue_ktype = {
1081 .sysfs_ops = &netdev_queue_sysfs_ops,
1082 .release = netdev_queue_release,
1083 .default_attrs = netdev_queue_default_attrs,
1084 };
1085
1086 static int netdev_queue_add_kobject(struct net_device *net, int index)
1087 {
1088 struct netdev_queue *queue = net->_tx + index;
1089 struct kobject *kobj = &queue->kobj;
1090 int error = 0;
1091
1092 kobj->kset = net->queues_kset;
1093 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1094 "tx-%u", index);
1095 if (error) {
1096 kobject_put(kobj);
1097 return error;
1098 }
1099
1100 kobject_uevent(kobj, KOBJ_ADD);
1101 dev_hold(queue->dev);
1102
1103 return error;
1104 }
1105 #endif /* CONFIG_XPS */
1106
1107 int
1108 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1109 {
1110 #ifdef CONFIG_XPS
1111 int i;
1112 int error = 0;
1113
1114 for (i = old_num; i < new_num; i++) {
1115 error = netdev_queue_add_kobject(net, i);
1116 if (error) {
1117 new_num = old_num;
1118 break;
1119 }
1120 }
1121
1122 while (--i >= new_num)
1123 kobject_put(&net->_tx[i].kobj);
1124
1125 return error;
1126 #else
1127 return 0;
1128 #endif
1129 }
1130
1131 static int register_queue_kobjects(struct net_device *net)
1132 {
1133 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1134
1135 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1136 net->queues_kset = kset_create_and_add("queues",
1137 NULL, &net->dev.kobj);
1138 if (!net->queues_kset)
1139 return -ENOMEM;
1140 #endif
1141
1142 #ifdef CONFIG_RPS
1143 real_rx = net->real_num_rx_queues;
1144 #endif
1145 real_tx = net->real_num_tx_queues;
1146
1147 error = net_rx_queue_update_kobjects(net, 0, real_rx);
1148 if (error)
1149 goto error;
1150 rxq = real_rx;
1151
1152 error = netdev_queue_update_kobjects(net, 0, real_tx);
1153 if (error)
1154 goto error;
1155 txq = real_tx;
1156
1157 return 0;
1158
1159 error:
1160 netdev_queue_update_kobjects(net, txq, 0);
1161 net_rx_queue_update_kobjects(net, rxq, 0);
1162 return error;
1163 }
1164
1165 static void remove_queue_kobjects(struct net_device *net)
1166 {
1167 int real_rx = 0, real_tx = 0;
1168
1169 #ifdef CONFIG_RPS
1170 real_rx = net->real_num_rx_queues;
1171 #endif
1172 real_tx = net->real_num_tx_queues;
1173
1174 net_rx_queue_update_kobjects(net, real_rx, 0);
1175 netdev_queue_update_kobjects(net, real_tx, 0);
1176 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1177 kset_unregister(net->queues_kset);
1178 #endif
1179 }
1180
1181 static void *net_grab_current_ns(void)
1182 {
1183 struct net *ns = current->nsproxy->net_ns;
1184 #ifdef CONFIG_NET_NS
1185 if (ns)
1186 atomic_inc(&ns->passive);
1187 #endif
1188 return ns;
1189 }
1190
1191 static const void *net_initial_ns(void)
1192 {
1193 return &init_net;
1194 }
1195
1196 static const void *net_netlink_ns(struct sock *sk)
1197 {
1198 return sock_net(sk);
1199 }
1200
1201 struct kobj_ns_type_operations net_ns_type_operations = {
1202 .type = KOBJ_NS_TYPE_NET,
1203 .grab_current_ns = net_grab_current_ns,
1204 .netlink_ns = net_netlink_ns,
1205 .initial_ns = net_initial_ns,
1206 .drop_ns = net_drop_ns,
1207 };
1208 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1209
1210 #ifdef CONFIG_HOTPLUG
1211 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1212 {
1213 struct net_device *dev = to_net_dev(d);
1214 int retval;
1215
1216 /* pass interface to uevent. */
1217 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1218 if (retval)
1219 goto exit;
1220
1221 /* pass ifindex to uevent.
1222 * ifindex is useful as it won't change (interface name may change)
1223 * and is what RtNetlink uses natively. */
1224 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1225
1226 exit:
1227 return retval;
1228 }
1229 #endif
1230
1231 /*
1232 * netdev_release -- destroy and free a dead device.
1233 * Called when last reference to device kobject is gone.
1234 */
1235 static void netdev_release(struct device *d)
1236 {
1237 struct net_device *dev = to_net_dev(d);
1238
1239 BUG_ON(dev->reg_state != NETREG_RELEASED);
1240
1241 kfree(dev->ifalias);
1242 kfree((char *)dev - dev->padded);
1243 }
1244
1245 static const void *net_namespace(struct device *d)
1246 {
1247 struct net_device *dev;
1248 dev = container_of(d, struct net_device, dev);
1249 return dev_net(dev);
1250 }
1251
1252 static struct class net_class = {
1253 .name = "net",
1254 .dev_release = netdev_release,
1255 #ifdef CONFIG_SYSFS
1256 .dev_attrs = net_class_attributes,
1257 #endif /* CONFIG_SYSFS */
1258 #ifdef CONFIG_HOTPLUG
1259 .dev_uevent = netdev_uevent,
1260 #endif
1261 .ns_type = &net_ns_type_operations,
1262 .namespace = net_namespace,
1263 };
1264
1265 /* Delete sysfs entries but hold kobject reference until after all
1266 * netdev references are gone.
1267 */
1268 void netdev_unregister_kobject(struct net_device * net)
1269 {
1270 struct device *dev = &(net->dev);
1271
1272 kobject_get(&dev->kobj);
1273
1274 remove_queue_kobjects(net);
1275
1276 device_del(dev);
1277 }
1278
1279 /* Create sysfs entries for network device. */
1280 int netdev_register_kobject(struct net_device *net)
1281 {
1282 struct device *dev = &(net->dev);
1283 const struct attribute_group **groups = net->sysfs_groups;
1284 int error = 0;
1285
1286 device_initialize(dev);
1287 dev->class = &net_class;
1288 dev->platform_data = net;
1289 dev->groups = groups;
1290
1291 dev_set_name(dev, "%s", net->name);
1292
1293 #ifdef CONFIG_SYSFS
1294 /* Allow for a device specific group */
1295 if (*groups)
1296 groups++;
1297
1298 *groups++ = &netstat_group;
1299 #ifdef CONFIG_WIRELESS_EXT_SYSFS
1300 if (net->ieee80211_ptr)
1301 *groups++ = &wireless_group;
1302 #ifdef CONFIG_WIRELESS_EXT
1303 else if (net->wireless_handlers)
1304 *groups++ = &wireless_group;
1305 #endif
1306 #endif
1307 #endif /* CONFIG_SYSFS */
1308
1309 error = device_add(dev);
1310 if (error)
1311 return error;
1312
1313 error = register_queue_kobjects(net);
1314 if (error) {
1315 device_del(dev);
1316 return error;
1317 }
1318
1319 return error;
1320 }
1321
1322 int netdev_class_create_file(struct class_attribute *class_attr)
1323 {
1324 return class_create_file(&net_class, class_attr);
1325 }
1326 EXPORT_SYMBOL(netdev_class_create_file);
1327
1328 void netdev_class_remove_file(struct class_attribute *class_attr)
1329 {
1330 class_remove_file(&net_class, class_attr);
1331 }
1332 EXPORT_SYMBOL(netdev_class_remove_file);
1333
1334 int netdev_kobject_init(void)
1335 {
1336 kobj_ns_type_register(&net_ns_type_operations);
1337 return class_register(&net_class);
1338 }
Linus' kernel tree