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kvm tools, setup: Create private directory
[linux-2.6/next.git] / net / core / net-sysfs.c
blob33d2a1fba131695451de05e191ae9c10fb2cd307
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(features, fmt_hex);
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 (!dev_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 (!dev_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(features, S_IRUGO, show_features, NULL),
316 __ATTR(type, S_IRUGO, show_type, NULL),
317 __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
318 __ATTR(address, S_IRUGO, show_address, NULL),
319 __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
320 __ATTR(carrier, S_IRUGO, show_carrier, NULL),
321 __ATTR(speed, S_IRUGO, show_speed, NULL),
322 __ATTR(duplex, S_IRUGO, show_duplex, NULL),
323 __ATTR(dormant, S_IRUGO, show_dormant, NULL),
324 __ATTR(operstate, S_IRUGO, show_operstate, NULL),
325 __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
326 __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
327 __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
328 store_tx_queue_len),
329 __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
330 {}
331 };
332
333 /* Show a given an attribute in the statistics group */
334 static ssize_t netstat_show(const struct device *d,
335 struct device_attribute *attr, char *buf,
336 unsigned long offset)
337 {
338 struct net_device *dev = to_net_dev(d);
339 ssize_t ret = -EINVAL;
340
341 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
342 offset % sizeof(u64) != 0);
343
344 read_lock(&dev_base_lock);
345 if (dev_isalive(dev)) {
346 struct rtnl_link_stats64 temp;
347 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
348
349 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
350 }
351 read_unlock(&dev_base_lock);
352 return ret;
353 }
354
355 /* generate a read-only statistics attribute */
356 #define NETSTAT_ENTRY(name) \
357 static ssize_t show_##name(struct device *d, \
358 struct device_attribute *attr, char *buf) \
359 { \
360 return netstat_show(d, attr, buf, \
361 offsetof(struct rtnl_link_stats64, name)); \
362 } \
363 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
364
365 NETSTAT_ENTRY(rx_packets);
366 NETSTAT_ENTRY(tx_packets);
367 NETSTAT_ENTRY(rx_bytes);
368 NETSTAT_ENTRY(tx_bytes);
369 NETSTAT_ENTRY(rx_errors);
370 NETSTAT_ENTRY(tx_errors);
371 NETSTAT_ENTRY(rx_dropped);
372 NETSTAT_ENTRY(tx_dropped);
373 NETSTAT_ENTRY(multicast);
374 NETSTAT_ENTRY(collisions);
375 NETSTAT_ENTRY(rx_length_errors);
376 NETSTAT_ENTRY(rx_over_errors);
377 NETSTAT_ENTRY(rx_crc_errors);
378 NETSTAT_ENTRY(rx_frame_errors);
379 NETSTAT_ENTRY(rx_fifo_errors);
380 NETSTAT_ENTRY(rx_missed_errors);
381 NETSTAT_ENTRY(tx_aborted_errors);
382 NETSTAT_ENTRY(tx_carrier_errors);
383 NETSTAT_ENTRY(tx_fifo_errors);
384 NETSTAT_ENTRY(tx_heartbeat_errors);
385 NETSTAT_ENTRY(tx_window_errors);
386 NETSTAT_ENTRY(rx_compressed);
387 NETSTAT_ENTRY(tx_compressed);
388
389 static struct attribute *netstat_attrs[] = {
390 &dev_attr_rx_packets.attr,
391 &dev_attr_tx_packets.attr,
392 &dev_attr_rx_bytes.attr,
393 &dev_attr_tx_bytes.attr,
394 &dev_attr_rx_errors.attr,
395 &dev_attr_tx_errors.attr,
396 &dev_attr_rx_dropped.attr,
397 &dev_attr_tx_dropped.attr,
398 &dev_attr_multicast.attr,
399 &dev_attr_collisions.attr,
400 &dev_attr_rx_length_errors.attr,
401 &dev_attr_rx_over_errors.attr,
402 &dev_attr_rx_crc_errors.attr,
403 &dev_attr_rx_frame_errors.attr,
404 &dev_attr_rx_fifo_errors.attr,
405 &dev_attr_rx_missed_errors.attr,
406 &dev_attr_tx_aborted_errors.attr,
407 &dev_attr_tx_carrier_errors.attr,
408 &dev_attr_tx_fifo_errors.attr,
409 &dev_attr_tx_heartbeat_errors.attr,
410 &dev_attr_tx_window_errors.attr,
411 &dev_attr_rx_compressed.attr,
412 &dev_attr_tx_compressed.attr,
413 NULL
414 };
415
416
417 static struct attribute_group netstat_group = {
418 .name = "statistics",
419 .attrs = netstat_attrs,
420 };
421
422 #ifdef CONFIG_WIRELESS_EXT_SYSFS
423 /* helper function that does all the locking etc for wireless stats */
424 static ssize_t wireless_show(struct device *d, char *buf,
425 ssize_t (*format)(const struct iw_statistics *,
426 char *))
427 {
428 struct net_device *dev = to_net_dev(d);
429 const struct iw_statistics *iw;
430 ssize_t ret = -EINVAL;
431
432 if (!rtnl_trylock())
433 return restart_syscall();
434 if (dev_isalive(dev)) {
435 iw = get_wireless_stats(dev);
436 if (iw)
437 ret = (*format)(iw, buf);
438 }
439 rtnl_unlock();
440
441 return ret;
442 }
443
444 /* show function template for wireless fields */
445 #define WIRELESS_SHOW(name, field, format_string) \
446 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
447 { \
448 return sprintf(buf, format_string, iw->field); \
449 } \
450 static ssize_t show_iw_##name(struct device *d, \
451 struct device_attribute *attr, char *buf) \
452 { \
453 return wireless_show(d, buf, format_iw_##name); \
454 } \
455 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
456
457 WIRELESS_SHOW(status, status, fmt_hex);
458 WIRELESS_SHOW(link, qual.qual, fmt_dec);
459 WIRELESS_SHOW(level, qual.level, fmt_dec);
460 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
461 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
462 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
463 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
464 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
465 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
466 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
467
468 static struct attribute *wireless_attrs[] = {
469 &dev_attr_status.attr,
470 &dev_attr_link.attr,
471 &dev_attr_level.attr,
472 &dev_attr_noise.attr,
473 &dev_attr_nwid.attr,
474 &dev_attr_crypt.attr,
475 &dev_attr_fragment.attr,
476 &dev_attr_retries.attr,
477 &dev_attr_misc.attr,
478 &dev_attr_beacon.attr,
479 NULL
480 };
481
482 static struct attribute_group wireless_group = {
483 .name = "wireless",
484 .attrs = wireless_attrs,
485 };
486 #endif
487 #endif /* CONFIG_SYSFS */
488
489 #ifdef CONFIG_RPS
490 /*
491 * RX queue sysfs structures and functions.
492 */
493 struct rx_queue_attribute {
494 struct attribute attr;
495 ssize_t (*show)(struct netdev_rx_queue *queue,
496 struct rx_queue_attribute *attr, char *buf);
497 ssize_t (*store)(struct netdev_rx_queue *queue,
498 struct rx_queue_attribute *attr, const char *buf, size_t len);
499 };
500 #define to_rx_queue_attr(_attr) container_of(_attr, \
501 struct rx_queue_attribute, attr)
502
503 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
504
505 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
506 char *buf)
507 {
508 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
509 struct netdev_rx_queue *queue = to_rx_queue(kobj);
510
511 if (!attribute->show)
512 return -EIO;
513
514 return attribute->show(queue, attribute, buf);
515 }
516
517 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
518 const char *buf, size_t count)
519 {
520 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
521 struct netdev_rx_queue *queue = to_rx_queue(kobj);
522
523 if (!attribute->store)
524 return -EIO;
525
526 return attribute->store(queue, attribute, buf, count);
527 }
528
529 static const struct sysfs_ops rx_queue_sysfs_ops = {
530 .show = rx_queue_attr_show,
531 .store = rx_queue_attr_store,
532 };
533
534 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
535 struct rx_queue_attribute *attribute, char *buf)
536 {
537 struct rps_map *map;
538 cpumask_var_t mask;
539 size_t len = 0;
540 int i;
541
542 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
543 return -ENOMEM;
544
545 rcu_read_lock();
546 map = rcu_dereference(queue->rps_map);
547 if (map)
548 for (i = 0; i < map->len; i++)
549 cpumask_set_cpu(map->cpus[i], mask);
550
551 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
552 if (PAGE_SIZE - len < 3) {
553 rcu_read_unlock();
554 free_cpumask_var(mask);
555 return -EINVAL;
556 }
557 rcu_read_unlock();
558
559 free_cpumask_var(mask);
560 len += sprintf(buf + len, "\n");
561 return len;
562 }
563
564 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
565 struct rx_queue_attribute *attribute,
566 const char *buf, size_t len)
567 {
568 struct rps_map *old_map, *map;
569 cpumask_var_t mask;
570 int err, cpu, i;
571 static DEFINE_SPINLOCK(rps_map_lock);
572
573 if (!capable(CAP_NET_ADMIN))
574 return -EPERM;
575
576 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
577 return -ENOMEM;
578
579 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
580 if (err) {
581 free_cpumask_var(mask);
582 return err;
583 }
584
585 map = kzalloc(max_t(unsigned,
586 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
587 GFP_KERNEL);
588 if (!map) {
589 free_cpumask_var(mask);
590 return -ENOMEM;
591 }
592
593 i = 0;
594 for_each_cpu_and(cpu, mask, cpu_online_mask)
595 map->cpus[i++] = cpu;
596
597 if (i)
598 map->len = i;
599 else {
600 kfree(map);
601 map = NULL;
602 }
603
604 spin_lock(&rps_map_lock);
605 old_map = rcu_dereference_protected(queue->rps_map,
606 lockdep_is_held(&rps_map_lock));
607 rcu_assign_pointer(queue->rps_map, map);
608 spin_unlock(&rps_map_lock);
609
610 if (old_map)
611 kfree_rcu(old_map, rcu);
612
613 free_cpumask_var(mask);
614 return len;
615 }
616
617 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
618 struct rx_queue_attribute *attr,
619 char *buf)
620 {
621 struct rps_dev_flow_table *flow_table;
622 unsigned int val = 0;
623
624 rcu_read_lock();
625 flow_table = rcu_dereference(queue->rps_flow_table);
626 if (flow_table)
627 val = flow_table->mask + 1;
628 rcu_read_unlock();
629
630 return sprintf(buf, "%u\n", val);
631 }
632
633 static void rps_dev_flow_table_release_work(struct work_struct *work)
634 {
635 struct rps_dev_flow_table *table = container_of(work,
636 struct rps_dev_flow_table, free_work);
637
638 vfree(table);
639 }
640
641 static void rps_dev_flow_table_release(struct rcu_head *rcu)
642 {
643 struct rps_dev_flow_table *table = container_of(rcu,
644 struct rps_dev_flow_table, rcu);
645
646 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
647 schedule_work(&table->free_work);
648 }
649
650 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
651 struct rx_queue_attribute *attr,
652 const char *buf, size_t len)
653 {
654 unsigned int count;
655 char *endp;
656 struct rps_dev_flow_table *table, *old_table;
657 static DEFINE_SPINLOCK(rps_dev_flow_lock);
658
659 if (!capable(CAP_NET_ADMIN))
660 return -EPERM;
661
662 count = simple_strtoul(buf, &endp, 0);
663 if (endp == buf)
664 return -EINVAL;
665
666 if (count) {
667 int i;
668
669 if (count > 1<<30) {
670 /* Enforce a limit to prevent overflow */
671 return -EINVAL;
672 }
673 count = roundup_pow_of_two(count);
674 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
675 if (!table)
676 return -ENOMEM;
677
678 table->mask = count - 1;
679 for (i = 0; i < count; i++)
680 table->flows[i].cpu = RPS_NO_CPU;
681 } else
682 table = NULL;
683
684 spin_lock(&rps_dev_flow_lock);
685 old_table = rcu_dereference_protected(queue->rps_flow_table,
686 lockdep_is_held(&rps_dev_flow_lock));
687 rcu_assign_pointer(queue->rps_flow_table, table);
688 spin_unlock(&rps_dev_flow_lock);
689
690 if (old_table)
691 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
692
693 return len;
694 }
695
696 static struct rx_queue_attribute rps_cpus_attribute =
697 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
698
699
700 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
701 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
702 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
703
704 static struct attribute *rx_queue_default_attrs[] = {
705 &rps_cpus_attribute.attr,
706 &rps_dev_flow_table_cnt_attribute.attr,
707 NULL
708 };
709
710 static void rx_queue_release(struct kobject *kobj)
711 {
712 struct netdev_rx_queue *queue = to_rx_queue(kobj);
713 struct rps_map *map;
714 struct rps_dev_flow_table *flow_table;
715
716
717 map = rcu_dereference_raw(queue->rps_map);
718 if (map) {
719 RCU_INIT_POINTER(queue->rps_map, NULL);
720 kfree_rcu(map, rcu);
721 }
722
723 flow_table = rcu_dereference_raw(queue->rps_flow_table);
724 if (flow_table) {
725 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
726 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
727 }
728
729 memset(kobj, 0, sizeof(*kobj));
730 dev_put(queue->dev);
731 }
732
733 static struct kobj_type rx_queue_ktype = {
734 .sysfs_ops = &rx_queue_sysfs_ops,
735 .release = rx_queue_release,
736 .default_attrs = rx_queue_default_attrs,
737 };
738
739 static int rx_queue_add_kobject(struct net_device *net, int index)
740 {
741 struct netdev_rx_queue *queue = net->_rx + index;
742 struct kobject *kobj = &queue->kobj;
743 int error = 0;
744
745 kobj->kset = net->queues_kset;
746 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
747 "rx-%u", index);
748 if (error) {
749 kobject_put(kobj);
750 return error;
751 }
752
753 kobject_uevent(kobj, KOBJ_ADD);
754 dev_hold(queue->dev);
755
756 return error;
757 }
758 #endif /* CONFIG_RPS */
759
760 int
761 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
762 {
763 #ifdef CONFIG_RPS
764 int i;
765 int error = 0;
766
767 for (i = old_num; i < new_num; i++) {
768 error = rx_queue_add_kobject(net, i);
769 if (error) {
770 new_num = old_num;
771 break;
772 }
773 }
774
775 while (--i >= new_num)
776 kobject_put(&net->_rx[i].kobj);
777
778 return error;
779 #else
780 return 0;
781 #endif
782 }
783
784 #ifdef CONFIG_XPS
785 /*
786 * netdev_queue sysfs structures and functions.
787 */
788 struct netdev_queue_attribute {
789 struct attribute attr;
790 ssize_t (*show)(struct netdev_queue *queue,
791 struct netdev_queue_attribute *attr, char *buf);
792 ssize_t (*store)(struct netdev_queue *queue,
793 struct netdev_queue_attribute *attr, const char *buf, size_t len);
794 };
795 #define to_netdev_queue_attr(_attr) container_of(_attr, \
796 struct netdev_queue_attribute, attr)
797
798 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
799
800 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
801 struct attribute *attr, char *buf)
802 {
803 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
804 struct netdev_queue *queue = to_netdev_queue(kobj);
805
806 if (!attribute->show)
807 return -EIO;
808
809 return attribute->show(queue, attribute, buf);
810 }
811
812 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
813 struct attribute *attr,
814 const char *buf, size_t count)
815 {
816 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
817 struct netdev_queue *queue = to_netdev_queue(kobj);
818
819 if (!attribute->store)
820 return -EIO;
821
822 return attribute->store(queue, attribute, buf, count);
823 }
824
825 static const struct sysfs_ops netdev_queue_sysfs_ops = {
826 .show = netdev_queue_attr_show,
827 .store = netdev_queue_attr_store,
828 };
829
830 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
831 {
832 struct net_device *dev = queue->dev;
833 int i;
834
835 for (i = 0; i < dev->num_tx_queues; i++)
836 if (queue == &dev->_tx[i])
837 break;
838
839 BUG_ON(i >= dev->num_tx_queues);
840
841 return i;
842 }
843
844
845 static ssize_t show_xps_map(struct netdev_queue *queue,
846 struct netdev_queue_attribute *attribute, char *buf)
847 {
848 struct net_device *dev = queue->dev;
849 struct xps_dev_maps *dev_maps;
850 cpumask_var_t mask;
851 unsigned long index;
852 size_t len = 0;
853 int i;
854
855 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
856 return -ENOMEM;
857
858 index = get_netdev_queue_index(queue);
859
860 rcu_read_lock();
861 dev_maps = rcu_dereference(dev->xps_maps);
862 if (dev_maps) {
863 for_each_possible_cpu(i) {
864 struct xps_map *map =
865 rcu_dereference(dev_maps->cpu_map[i]);
866 if (map) {
867 int j;
868 for (j = 0; j < map->len; j++) {
869 if (map->queues[j] == index) {
870 cpumask_set_cpu(i, mask);
871 break;
872 }
873 }
874 }
875 }
876 }
877 rcu_read_unlock();
878
879 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
880 if (PAGE_SIZE - len < 3) {
881 free_cpumask_var(mask);
882 return -EINVAL;
883 }
884
885 free_cpumask_var(mask);
886 len += sprintf(buf + len, "\n");
887 return len;
888 }
889
890 static DEFINE_MUTEX(xps_map_mutex);
891 #define xmap_dereference(P) \
892 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
893
894 static ssize_t store_xps_map(struct netdev_queue *queue,
895 struct netdev_queue_attribute *attribute,
896 const char *buf, size_t len)
897 {
898 struct net_device *dev = queue->dev;
899 cpumask_var_t mask;
900 int err, i, cpu, pos, map_len, alloc_len, need_set;
901 unsigned long index;
902 struct xps_map *map, *new_map;
903 struct xps_dev_maps *dev_maps, *new_dev_maps;
904 int nonempty = 0;
905 int numa_node = -2;
906
907 if (!capable(CAP_NET_ADMIN))
908 return -EPERM;
909
910 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
911 return -ENOMEM;
912
913 index = get_netdev_queue_index(queue);
914
915 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
916 if (err) {
917 free_cpumask_var(mask);
918 return err;
919 }
920
921 new_dev_maps = kzalloc(max_t(unsigned,
922 XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
923 if (!new_dev_maps) {
924 free_cpumask_var(mask);
925 return -ENOMEM;
926 }
927
928 mutex_lock(&xps_map_mutex);
929
930 dev_maps = xmap_dereference(dev->xps_maps);
931
932 for_each_possible_cpu(cpu) {
933 map = dev_maps ?
934 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
935 new_map = map;
936 if (map) {
937 for (pos = 0; pos < map->len; pos++)
938 if (map->queues[pos] == index)
939 break;
940 map_len = map->len;
941 alloc_len = map->alloc_len;
942 } else
943 pos = map_len = alloc_len = 0;
944
945 need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu);
946 #ifdef CONFIG_NUMA
947 if (need_set) {
948 if (numa_node == -2)
949 numa_node = cpu_to_node(cpu);
950 else if (numa_node != cpu_to_node(cpu))
951 numa_node = -1;
952 }
953 #endif
954 if (need_set && pos >= map_len) {
955 /* Need to add queue to this CPU's map */
956 if (map_len >= alloc_len) {
957 alloc_len = alloc_len ?
958 2 * alloc_len : XPS_MIN_MAP_ALLOC;
959 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
960 GFP_KERNEL,
961 cpu_to_node(cpu));
962 if (!new_map)
963 goto error;
964 new_map->alloc_len = alloc_len;
965 for (i = 0; i < map_len; i++)
966 new_map->queues[i] = map->queues[i];
967 new_map->len = map_len;
968 }
969 new_map->queues[new_map->len++] = index;
970 } else if (!need_set && pos < map_len) {
971 /* Need to remove queue from this CPU's map */
972 if (map_len > 1)
973 new_map->queues[pos] =
974 new_map->queues[--new_map->len];
975 else
976 new_map = NULL;
977 }
978 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
979 }
980
981 /* Cleanup old maps */
982 for_each_possible_cpu(cpu) {
983 map = dev_maps ?
984 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
985 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
986 kfree_rcu(map, rcu);
987 if (new_dev_maps->cpu_map[cpu])
988 nonempty = 1;
989 }
990
991 if (nonempty)
992 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
993 else {
994 kfree(new_dev_maps);
995 rcu_assign_pointer(dev->xps_maps, NULL);
996 }
997
998 if (dev_maps)
999 kfree_rcu(dev_maps, rcu);
1000
1001 netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node :
1002 NUMA_NO_NODE);
1003
1004 mutex_unlock(&xps_map_mutex);
1005
1006 free_cpumask_var(mask);
1007 return len;
1008
1009 error:
1010 mutex_unlock(&xps_map_mutex);
1011
1012 if (new_dev_maps)
1013 for_each_possible_cpu(i)
1014 kfree(rcu_dereference_protected(
1015 new_dev_maps->cpu_map[i],
1016 1));
1017 kfree(new_dev_maps);
1018 free_cpumask_var(mask);
1019 return -ENOMEM;
1020 }
1021
1022 static struct netdev_queue_attribute xps_cpus_attribute =
1023 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1024
1025 static struct attribute *netdev_queue_default_attrs[] = {
1026 &xps_cpus_attribute.attr,
1027 NULL
1028 };
1029
1030 static void netdev_queue_release(struct kobject *kobj)
1031 {
1032 struct netdev_queue *queue = to_netdev_queue(kobj);
1033 struct net_device *dev = queue->dev;
1034 struct xps_dev_maps *dev_maps;
1035 struct xps_map *map;
1036 unsigned long index;
1037 int i, pos, nonempty = 0;
1038
1039 index = get_netdev_queue_index(queue);
1040
1041 mutex_lock(&xps_map_mutex);
1042 dev_maps = xmap_dereference(dev->xps_maps);
1043
1044 if (dev_maps) {
1045 for_each_possible_cpu(i) {
1046 map = xmap_dereference(dev_maps->cpu_map[i]);
1047 if (!map)
1048 continue;
1049
1050 for (pos = 0; pos < map->len; pos++)
1051 if (map->queues[pos] == index)
1052 break;
1053
1054 if (pos < map->len) {
1055 if (map->len > 1)
1056 map->queues[pos] =
1057 map->queues[--map->len];
1058 else {
1059 RCU_INIT_POINTER(dev_maps->cpu_map[i],
1060 NULL);
1061 kfree_rcu(map, rcu);
1062 map = NULL;
1063 }
1064 }
1065 if (map)
1066 nonempty = 1;
1067 }
1068
1069 if (!nonempty) {
1070 RCU_INIT_POINTER(dev->xps_maps, NULL);
1071 kfree_rcu(dev_maps, rcu);
1072 }
1073 }
1074
1075 mutex_unlock(&xps_map_mutex);
1076
1077 memset(kobj, 0, sizeof(*kobj));
1078 dev_put(queue->dev);
1079 }
1080
1081 static struct kobj_type netdev_queue_ktype = {
1082 .sysfs_ops = &netdev_queue_sysfs_ops,
1083 .release = netdev_queue_release,
1084 .default_attrs = netdev_queue_default_attrs,
1085 };
1086
1087 static int netdev_queue_add_kobject(struct net_device *net, int index)
1088 {
1089 struct netdev_queue *queue = net->_tx + index;
1090 struct kobject *kobj = &queue->kobj;
1091 int error = 0;
1092
1093 kobj->kset = net->queues_kset;
1094 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1095 "tx-%u", index);
1096 if (error) {
1097 kobject_put(kobj);
1098 return error;
1099 }
1100
1101 kobject_uevent(kobj, KOBJ_ADD);
1102 dev_hold(queue->dev);
1103
1104 return error;
1105 }
1106 #endif /* CONFIG_XPS */
1107
1108 int
1109 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1110 {
1111 #ifdef CONFIG_XPS
1112 int i;
1113 int error = 0;
1114
1115 for (i = old_num; i < new_num; i++) {
1116 error = netdev_queue_add_kobject(net, i);
1117 if (error) {
1118 new_num = old_num;
1119 break;
1120 }
1121 }
1122
1123 while (--i >= new_num)
1124 kobject_put(&net->_tx[i].kobj);
1125
1126 return error;
1127 #else
1128 return 0;
1129 #endif
1130 }
1131
1132 static int register_queue_kobjects(struct net_device *net)
1133 {
1134 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1135
1136 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1137 net->queues_kset = kset_create_and_add("queues",
1138 NULL, &net->dev.kobj);
1139 if (!net->queues_kset)
1140 return -ENOMEM;
1141 #endif
1142
1143 #ifdef CONFIG_RPS
1144 real_rx = net->real_num_rx_queues;
1145 #endif
1146 real_tx = net->real_num_tx_queues;
1147
1148 error = net_rx_queue_update_kobjects(net, 0, real_rx);
1149 if (error)
1150 goto error;
1151 rxq = real_rx;
1152
1153 error = netdev_queue_update_kobjects(net, 0, real_tx);
1154 if (error)
1155 goto error;
1156 txq = real_tx;
1157
1158 return 0;
1159
1160 error:
1161 netdev_queue_update_kobjects(net, txq, 0);
1162 net_rx_queue_update_kobjects(net, rxq, 0);
1163 return error;
1164 }
1165
1166 static void remove_queue_kobjects(struct net_device *net)
1167 {
1168 int real_rx = 0, real_tx = 0;
1169
1170 #ifdef CONFIG_RPS
1171 real_rx = net->real_num_rx_queues;
1172 #endif
1173 real_tx = net->real_num_tx_queues;
1174
1175 net_rx_queue_update_kobjects(net, real_rx, 0);
1176 netdev_queue_update_kobjects(net, real_tx, 0);
1177 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1178 kset_unregister(net->queues_kset);
1179 #endif
1180 }
1181
1182 static void *net_grab_current_ns(void)
1183 {
1184 struct net *ns = current->nsproxy->net_ns;
1185 #ifdef CONFIG_NET_NS
1186 if (ns)
1187 atomic_inc(&ns->passive);
1188 #endif
1189 return ns;
1190 }
1191
1192 static const void *net_initial_ns(void)
1193 {
1194 return &init_net;
1195 }
1196
1197 static const void *net_netlink_ns(struct sock *sk)
1198 {
1199 return sock_net(sk);
1200 }
1201
1202 struct kobj_ns_type_operations net_ns_type_operations = {
1203 .type = KOBJ_NS_TYPE_NET,
1204 .grab_current_ns = net_grab_current_ns,
1205 .netlink_ns = net_netlink_ns,
1206 .initial_ns = net_initial_ns,
1207 .drop_ns = net_drop_ns,
1208 };
1209 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1210
1211 #ifdef CONFIG_HOTPLUG
1212 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1213 {
1214 struct net_device *dev = to_net_dev(d);
1215 int retval;
1216
1217 /* pass interface to uevent. */
1218 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1219 if (retval)
1220 goto exit;
1221
1222 /* pass ifindex to uevent.
1223 * ifindex is useful as it won't change (interface name may change)
1224 * and is what RtNetlink uses natively. */
1225 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1226
1227 exit:
1228 return retval;
1229 }
1230 #endif
1231
1232 /*
1233 * netdev_release -- destroy and free a dead device.
1234 * Called when last reference to device kobject is gone.
1235 */
1236 static void netdev_release(struct device *d)
1237 {
1238 struct net_device *dev = to_net_dev(d);
1239
1240 BUG_ON(dev->reg_state != NETREG_RELEASED);
1241
1242 kfree(dev->ifalias);
1243 kfree((char *)dev - dev->padded);
1244 }
1245
1246 static const void *net_namespace(struct device *d)
1247 {
1248 struct net_device *dev;
1249 dev = container_of(d, struct net_device, dev);
1250 return dev_net(dev);
1251 }
1252
1253 static struct class net_class = {
1254 .name = "net",
1255 .dev_release = netdev_release,
1256 #ifdef CONFIG_SYSFS
1257 .dev_attrs = net_class_attributes,
1258 #endif /* CONFIG_SYSFS */
1259 #ifdef CONFIG_HOTPLUG
1260 .dev_uevent = netdev_uevent,
1261 #endif
1262 .ns_type = &net_ns_type_operations,
1263 .namespace = net_namespace,
1264 };
1265
1266 /* Delete sysfs entries but hold kobject reference until after all
1267 * netdev references are gone.
1268 */
1269 void netdev_unregister_kobject(struct net_device * net)
1270 {
1271 struct device *dev = &(net->dev);
1272
1273 kobject_get(&dev->kobj);
1274
1275 remove_queue_kobjects(net);
1276
1277 device_del(dev);
1278 }
1279
1280 /* Create sysfs entries for network device. */
1281 int netdev_register_kobject(struct net_device *net)
1282 {
1283 struct device *dev = &(net->dev);
1284 const struct attribute_group **groups = net->sysfs_groups;
1285 int error = 0;
1286
1287 device_initialize(dev);
1288 dev->class = &net_class;
1289 dev->platform_data = net;
1290 dev->groups = groups;
1291
1292 dev_set_name(dev, "%s", net->name);
1293
1294 #ifdef CONFIG_SYSFS
1295 /* Allow for a device specific group */
1296 if (*groups)
1297 groups++;
1298
1299 *groups++ = &netstat_group;
1300 #ifdef CONFIG_WIRELESS_EXT_SYSFS
1301 if (net->ieee80211_ptr)
1302 *groups++ = &wireless_group;
1303 #ifdef CONFIG_WIRELESS_EXT
1304 else if (net->wireless_handlers)
1305 *groups++ = &wireless_group;
1306 #endif
1307 #endif
1308 #endif /* CONFIG_SYSFS */
1309
1310 error = device_add(dev);
1311 if (error)
1312 return error;
1313
1314 error = register_queue_kobjects(net);
1315 if (error) {
1316 device_del(dev);
1317 return error;
1318 }
1319
1320 return error;
1321 }
1322
1323 int netdev_class_create_file(struct class_attribute *class_attr)
1324 {
1325 return class_create_file(&net_class, class_attr);
1326 }
1327 EXPORT_SYMBOL(netdev_class_create_file);
1328
1329 void netdev_class_remove_file(struct class_attribute *class_attr)
1330 {
1331 class_remove_file(&net_class, class_attr);
1332 }
1333 EXPORT_SYMBOL(netdev_class_remove_file);
1334
1335 int netdev_kobject_init(void)
1336 {
1337 kobj_ns_type_register(&net_ns_type_operations);
1338 return class_register(&net_class);
1339 }
linux-next