netns: Teach network device kobjects which namespace they are in.
[linux-2.6.git] / net / core / net-sysfs.c
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_ulong[] = "%lu\n";
32
33 static inline int dev_isalive(const struct net_device *dev)
34 {
35         return dev->reg_state <= NETREG_REGISTERED;
36 }
37
38 /* use same locking rules as GIF* ioctl's */
39 static ssize_t netdev_show(const struct device *dev,
40                            struct device_attribute *attr, char *buf,
41                            ssize_t (*format)(const struct net_device *, char *))
42 {
43         struct net_device *net = to_net_dev(dev);
44         ssize_t ret = -EINVAL;
45
46         read_lock(&dev_base_lock);
47         if (dev_isalive(net))
48                 ret = (*format)(net, buf);
49         read_unlock(&dev_base_lock);
50
51         return ret;
52 }
53
54 /* generate a show function for simple field */
55 #define NETDEVICE_SHOW(field, format_string)                            \
56 static ssize_t format_##field(const struct net_device *net, char *buf)  \
57 {                                                                       \
58         return sprintf(buf, format_string, net->field);                 \
59 }                                                                       \
60 static ssize_t show_##field(struct device *dev,                         \
61                             struct device_attribute *attr, char *buf)   \
62 {                                                                       \
63         return netdev_show(dev, attr, buf, format_##field);             \
64 }
65
66
67 /* use same locking and permission rules as SIF* ioctl's */
68 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
69                             const char *buf, size_t len,
70                             int (*set)(struct net_device *, unsigned long))
71 {
72         struct net_device *net = to_net_dev(dev);
73         char *endp;
74         unsigned long new;
75         int ret = -EINVAL;
76
77         if (!capable(CAP_NET_ADMIN))
78                 return -EPERM;
79
80         new = simple_strtoul(buf, &endp, 0);
81         if (endp == buf)
82                 goto err;
83
84         if (!rtnl_trylock())
85                 return restart_syscall();
86
87         if (dev_isalive(net)) {
88                 if ((ret = (*set)(net, new)) == 0)
89                         ret = len;
90         }
91         rtnl_unlock();
92  err:
93         return ret;
94 }
95
96 NETDEVICE_SHOW(dev_id, fmt_hex);
97 NETDEVICE_SHOW(addr_len, fmt_dec);
98 NETDEVICE_SHOW(iflink, fmt_dec);
99 NETDEVICE_SHOW(ifindex, fmt_dec);
100 NETDEVICE_SHOW(features, fmt_long_hex);
101 NETDEVICE_SHOW(type, fmt_dec);
102 NETDEVICE_SHOW(link_mode, fmt_dec);
103
104 /* use same locking rules as GIFHWADDR ioctl's */
105 static ssize_t show_address(struct device *dev, struct device_attribute *attr,
106                             char *buf)
107 {
108         struct net_device *net = to_net_dev(dev);
109         ssize_t ret = -EINVAL;
110
111         read_lock(&dev_base_lock);
112         if (dev_isalive(net))
113                 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
114         read_unlock(&dev_base_lock);
115         return ret;
116 }
117
118 static ssize_t show_broadcast(struct device *dev,
119                             struct device_attribute *attr, char *buf)
120 {
121         struct net_device *net = to_net_dev(dev);
122         if (dev_isalive(net))
123                 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
124         return -EINVAL;
125 }
126
127 static ssize_t show_carrier(struct device *dev,
128                             struct device_attribute *attr, char *buf)
129 {
130         struct net_device *netdev = to_net_dev(dev);
131         if (netif_running(netdev)) {
132                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
133         }
134         return -EINVAL;
135 }
136
137 static ssize_t show_speed(struct device *dev,
138                           struct device_attribute *attr, char *buf)
139 {
140         struct net_device *netdev = to_net_dev(dev);
141         int ret = -EINVAL;
142
143         if (!rtnl_trylock())
144                 return restart_syscall();
145
146         if (netif_running(netdev) &&
147             netdev->ethtool_ops &&
148             netdev->ethtool_ops->get_settings) {
149                 struct ethtool_cmd cmd = { ETHTOOL_GSET };
150
151                 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
152                         ret = sprintf(buf, fmt_dec, 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             netdev->ethtool_ops &&
169             netdev->ethtool_ops->get_settings) {
170                 struct ethtool_cmd cmd = { ETHTOOL_GSET };
171
172                 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
173                         ret = sprintf(buf, "%s\n", cmd.duplex ? "full" : "half");
174         }
175         rtnl_unlock();
176         return ret;
177 }
178
179 static ssize_t show_dormant(struct device *dev,
180                             struct device_attribute *attr, char *buf)
181 {
182         struct net_device *netdev = to_net_dev(dev);
183
184         if (netif_running(netdev))
185                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
186
187         return -EINVAL;
188 }
189
190 static const char *const operstates[] = {
191         "unknown",
192         "notpresent", /* currently unused */
193         "down",
194         "lowerlayerdown",
195         "testing", /* currently unused */
196         "dormant",
197         "up"
198 };
199
200 static ssize_t show_operstate(struct device *dev,
201                               struct device_attribute *attr, char *buf)
202 {
203         const struct net_device *netdev = to_net_dev(dev);
204         unsigned char operstate;
205
206         read_lock(&dev_base_lock);
207         operstate = netdev->operstate;
208         if (!netif_running(netdev))
209                 operstate = IF_OPER_DOWN;
210         read_unlock(&dev_base_lock);
211
212         if (operstate >= ARRAY_SIZE(operstates))
213                 return -EINVAL; /* should not happen */
214
215         return sprintf(buf, "%s\n", operstates[operstate]);
216 }
217
218 /* read-write attributes */
219 NETDEVICE_SHOW(mtu, fmt_dec);
220
221 static int change_mtu(struct net_device *net, unsigned long new_mtu)
222 {
223         return dev_set_mtu(net, (int) new_mtu);
224 }
225
226 static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
227                          const char *buf, size_t len)
228 {
229         return netdev_store(dev, attr, buf, len, change_mtu);
230 }
231
232 NETDEVICE_SHOW(flags, fmt_hex);
233
234 static int change_flags(struct net_device *net, unsigned long new_flags)
235 {
236         return dev_change_flags(net, (unsigned) new_flags);
237 }
238
239 static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
240                            const char *buf, size_t len)
241 {
242         return netdev_store(dev, attr, buf, len, change_flags);
243 }
244
245 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
246
247 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
248 {
249         net->tx_queue_len = new_len;
250         return 0;
251 }
252
253 static ssize_t store_tx_queue_len(struct device *dev,
254                                   struct device_attribute *attr,
255                                   const char *buf, size_t len)
256 {
257         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
258 }
259
260 static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
261                              const char *buf, size_t len)
262 {
263         struct net_device *netdev = to_net_dev(dev);
264         size_t count = len;
265         ssize_t ret;
266
267         if (!capable(CAP_NET_ADMIN))
268                 return -EPERM;
269
270         /* ignore trailing newline */
271         if (len >  0 && buf[len - 1] == '\n')
272                 --count;
273
274         if (!rtnl_trylock())
275                 return restart_syscall();
276         ret = dev_set_alias(netdev, buf, count);
277         rtnl_unlock();
278
279         return ret < 0 ? ret : len;
280 }
281
282 static ssize_t show_ifalias(struct device *dev,
283                             struct device_attribute *attr, char *buf)
284 {
285         const struct net_device *netdev = to_net_dev(dev);
286         ssize_t ret = 0;
287
288         if (!rtnl_trylock())
289                 return restart_syscall();
290         if (netdev->ifalias)
291                 ret = sprintf(buf, "%s\n", netdev->ifalias);
292         rtnl_unlock();
293         return ret;
294 }
295
296 static struct device_attribute net_class_attributes[] = {
297         __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
298         __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
299         __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
300         __ATTR(iflink, S_IRUGO, show_iflink, NULL),
301         __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
302         __ATTR(features, S_IRUGO, show_features, NULL),
303         __ATTR(type, S_IRUGO, show_type, NULL),
304         __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
305         __ATTR(address, S_IRUGO, show_address, NULL),
306         __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
307         __ATTR(carrier, S_IRUGO, show_carrier, NULL),
308         __ATTR(speed, S_IRUGO, show_speed, NULL),
309         __ATTR(duplex, S_IRUGO, show_duplex, NULL),
310         __ATTR(dormant, S_IRUGO, show_dormant, NULL),
311         __ATTR(operstate, S_IRUGO, show_operstate, NULL),
312         __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
313         __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
314         __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
315                store_tx_queue_len),
316         {}
317 };
318
319 /* Show a given an attribute in the statistics group */
320 static ssize_t netstat_show(const struct device *d,
321                             struct device_attribute *attr, char *buf,
322                             unsigned long offset)
323 {
324         struct net_device *dev = to_net_dev(d);
325         ssize_t ret = -EINVAL;
326
327         WARN_ON(offset > sizeof(struct net_device_stats) ||
328                         offset % sizeof(unsigned long) != 0);
329
330         read_lock(&dev_base_lock);
331         if (dev_isalive(dev)) {
332                 const struct net_device_stats *stats = dev_get_stats(dev);
333                 ret = sprintf(buf, fmt_ulong,
334                               *(unsigned long *)(((u8 *) stats) + offset));
335         }
336         read_unlock(&dev_base_lock);
337         return ret;
338 }
339
340 /* generate a read-only statistics attribute */
341 #define NETSTAT_ENTRY(name)                                             \
342 static ssize_t show_##name(struct device *d,                            \
343                            struct device_attribute *attr, char *buf)    \
344 {                                                                       \
345         return netstat_show(d, attr, buf,                               \
346                             offsetof(struct net_device_stats, name));   \
347 }                                                                       \
348 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
349
350 NETSTAT_ENTRY(rx_packets);
351 NETSTAT_ENTRY(tx_packets);
352 NETSTAT_ENTRY(rx_bytes);
353 NETSTAT_ENTRY(tx_bytes);
354 NETSTAT_ENTRY(rx_errors);
355 NETSTAT_ENTRY(tx_errors);
356 NETSTAT_ENTRY(rx_dropped);
357 NETSTAT_ENTRY(tx_dropped);
358 NETSTAT_ENTRY(multicast);
359 NETSTAT_ENTRY(collisions);
360 NETSTAT_ENTRY(rx_length_errors);
361 NETSTAT_ENTRY(rx_over_errors);
362 NETSTAT_ENTRY(rx_crc_errors);
363 NETSTAT_ENTRY(rx_frame_errors);
364 NETSTAT_ENTRY(rx_fifo_errors);
365 NETSTAT_ENTRY(rx_missed_errors);
366 NETSTAT_ENTRY(tx_aborted_errors);
367 NETSTAT_ENTRY(tx_carrier_errors);
368 NETSTAT_ENTRY(tx_fifo_errors);
369 NETSTAT_ENTRY(tx_heartbeat_errors);
370 NETSTAT_ENTRY(tx_window_errors);
371 NETSTAT_ENTRY(rx_compressed);
372 NETSTAT_ENTRY(tx_compressed);
373
374 static struct attribute *netstat_attrs[] = {
375         &dev_attr_rx_packets.attr,
376         &dev_attr_tx_packets.attr,
377         &dev_attr_rx_bytes.attr,
378         &dev_attr_tx_bytes.attr,
379         &dev_attr_rx_errors.attr,
380         &dev_attr_tx_errors.attr,
381         &dev_attr_rx_dropped.attr,
382         &dev_attr_tx_dropped.attr,
383         &dev_attr_multicast.attr,
384         &dev_attr_collisions.attr,
385         &dev_attr_rx_length_errors.attr,
386         &dev_attr_rx_over_errors.attr,
387         &dev_attr_rx_crc_errors.attr,
388         &dev_attr_rx_frame_errors.attr,
389         &dev_attr_rx_fifo_errors.attr,
390         &dev_attr_rx_missed_errors.attr,
391         &dev_attr_tx_aborted_errors.attr,
392         &dev_attr_tx_carrier_errors.attr,
393         &dev_attr_tx_fifo_errors.attr,
394         &dev_attr_tx_heartbeat_errors.attr,
395         &dev_attr_tx_window_errors.attr,
396         &dev_attr_rx_compressed.attr,
397         &dev_attr_tx_compressed.attr,
398         NULL
399 };
400
401
402 static struct attribute_group netstat_group = {
403         .name  = "statistics",
404         .attrs  = netstat_attrs,
405 };
406
407 #ifdef CONFIG_WIRELESS_EXT_SYSFS
408 /* helper function that does all the locking etc for wireless stats */
409 static ssize_t wireless_show(struct device *d, char *buf,
410                              ssize_t (*format)(const struct iw_statistics *,
411                                                char *))
412 {
413         struct net_device *dev = to_net_dev(d);
414         const struct iw_statistics *iw;
415         ssize_t ret = -EINVAL;
416
417         if (!rtnl_trylock())
418                 return restart_syscall();
419         if (dev_isalive(dev)) {
420                 iw = get_wireless_stats(dev);
421                 if (iw)
422                         ret = (*format)(iw, buf);
423         }
424         rtnl_unlock();
425
426         return ret;
427 }
428
429 /* show function template for wireless fields */
430 #define WIRELESS_SHOW(name, field, format_string)                       \
431 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
432 {                                                                       \
433         return sprintf(buf, format_string, iw->field);                  \
434 }                                                                       \
435 static ssize_t show_iw_##name(struct device *d,                         \
436                               struct device_attribute *attr, char *buf) \
437 {                                                                       \
438         return wireless_show(d, buf, format_iw_##name);                 \
439 }                                                                       \
440 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
441
442 WIRELESS_SHOW(status, status, fmt_hex);
443 WIRELESS_SHOW(link, qual.qual, fmt_dec);
444 WIRELESS_SHOW(level, qual.level, fmt_dec);
445 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
446 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
447 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
448 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
449 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
450 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
451 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
452
453 static struct attribute *wireless_attrs[] = {
454         &dev_attr_status.attr,
455         &dev_attr_link.attr,
456         &dev_attr_level.attr,
457         &dev_attr_noise.attr,
458         &dev_attr_nwid.attr,
459         &dev_attr_crypt.attr,
460         &dev_attr_fragment.attr,
461         &dev_attr_retries.attr,
462         &dev_attr_misc.attr,
463         &dev_attr_beacon.attr,
464         NULL
465 };
466
467 static struct attribute_group wireless_group = {
468         .name = "wireless",
469         .attrs = wireless_attrs,
470 };
471 #endif
472
473 #ifdef CONFIG_RPS
474 /*
475  * RX queue sysfs structures and functions.
476  */
477 struct rx_queue_attribute {
478         struct attribute attr;
479         ssize_t (*show)(struct netdev_rx_queue *queue,
480             struct rx_queue_attribute *attr, char *buf);
481         ssize_t (*store)(struct netdev_rx_queue *queue,
482             struct rx_queue_attribute *attr, const char *buf, size_t len);
483 };
484 #define to_rx_queue_attr(_attr) container_of(_attr,             \
485     struct rx_queue_attribute, attr)
486
487 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
488
489 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
490                                   char *buf)
491 {
492         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
493         struct netdev_rx_queue *queue = to_rx_queue(kobj);
494
495         if (!attribute->show)
496                 return -EIO;
497
498         return attribute->show(queue, attribute, buf);
499 }
500
501 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
502                                    const char *buf, size_t count)
503 {
504         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
505         struct netdev_rx_queue *queue = to_rx_queue(kobj);
506
507         if (!attribute->store)
508                 return -EIO;
509
510         return attribute->store(queue, attribute, buf, count);
511 }
512
513 static struct sysfs_ops rx_queue_sysfs_ops = {
514         .show = rx_queue_attr_show,
515         .store = rx_queue_attr_store,
516 };
517
518 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
519                             struct rx_queue_attribute *attribute, char *buf)
520 {
521         struct rps_map *map;
522         cpumask_var_t mask;
523         size_t len = 0;
524         int i;
525
526         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
527                 return -ENOMEM;
528
529         rcu_read_lock();
530         map = rcu_dereference(queue->rps_map);
531         if (map)
532                 for (i = 0; i < map->len; i++)
533                         cpumask_set_cpu(map->cpus[i], mask);
534
535         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
536         if (PAGE_SIZE - len < 3) {
537                 rcu_read_unlock();
538                 free_cpumask_var(mask);
539                 return -EINVAL;
540         }
541         rcu_read_unlock();
542
543         free_cpumask_var(mask);
544         len += sprintf(buf + len, "\n");
545         return len;
546 }
547
548 static void rps_map_release(struct rcu_head *rcu)
549 {
550         struct rps_map *map = container_of(rcu, struct rps_map, rcu);
551
552         kfree(map);
553 }
554
555 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
556                       struct rx_queue_attribute *attribute,
557                       const char *buf, size_t len)
558 {
559         struct rps_map *old_map, *map;
560         cpumask_var_t mask;
561         int err, cpu, i;
562         static DEFINE_SPINLOCK(rps_map_lock);
563
564         if (!capable(CAP_NET_ADMIN))
565                 return -EPERM;
566
567         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
568                 return -ENOMEM;
569
570         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
571         if (err) {
572                 free_cpumask_var(mask);
573                 return err;
574         }
575
576         map = kzalloc(max_t(unsigned,
577             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
578             GFP_KERNEL);
579         if (!map) {
580                 free_cpumask_var(mask);
581                 return -ENOMEM;
582         }
583
584         i = 0;
585         for_each_cpu_and(cpu, mask, cpu_online_mask)
586                 map->cpus[i++] = cpu;
587
588         if (i)
589                 map->len = i;
590         else {
591                 kfree(map);
592                 map = NULL;
593         }
594
595         spin_lock(&rps_map_lock);
596         old_map = queue->rps_map;
597         rcu_assign_pointer(queue->rps_map, map);
598         spin_unlock(&rps_map_lock);
599
600         if (old_map)
601                 call_rcu(&old_map->rcu, rps_map_release);
602
603         free_cpumask_var(mask);
604         return len;
605 }
606
607 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
608                                            struct rx_queue_attribute *attr,
609                                            char *buf)
610 {
611         struct rps_dev_flow_table *flow_table;
612         unsigned int val = 0;
613
614         rcu_read_lock();
615         flow_table = rcu_dereference(queue->rps_flow_table);
616         if (flow_table)
617                 val = flow_table->mask + 1;
618         rcu_read_unlock();
619
620         return sprintf(buf, "%u\n", val);
621 }
622
623 static void rps_dev_flow_table_release_work(struct work_struct *work)
624 {
625         struct rps_dev_flow_table *table = container_of(work,
626             struct rps_dev_flow_table, free_work);
627
628         vfree(table);
629 }
630
631 static void rps_dev_flow_table_release(struct rcu_head *rcu)
632 {
633         struct rps_dev_flow_table *table = container_of(rcu,
634             struct rps_dev_flow_table, rcu);
635
636         INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
637         schedule_work(&table->free_work);
638 }
639
640 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
641                                      struct rx_queue_attribute *attr,
642                                      const char *buf, size_t len)
643 {
644         unsigned int count;
645         char *endp;
646         struct rps_dev_flow_table *table, *old_table;
647         static DEFINE_SPINLOCK(rps_dev_flow_lock);
648
649         if (!capable(CAP_NET_ADMIN))
650                 return -EPERM;
651
652         count = simple_strtoul(buf, &endp, 0);
653         if (endp == buf)
654                 return -EINVAL;
655
656         if (count) {
657                 int i;
658
659                 if (count > 1<<30) {
660                         /* Enforce a limit to prevent overflow */
661                         return -EINVAL;
662                 }
663                 count = roundup_pow_of_two(count);
664                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
665                 if (!table)
666                         return -ENOMEM;
667
668                 table->mask = count - 1;
669                 for (i = 0; i < count; i++)
670                         table->flows[i].cpu = RPS_NO_CPU;
671         } else
672                 table = NULL;
673
674         spin_lock(&rps_dev_flow_lock);
675         old_table = queue->rps_flow_table;
676         rcu_assign_pointer(queue->rps_flow_table, table);
677         spin_unlock(&rps_dev_flow_lock);
678
679         if (old_table)
680                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
681
682         return len;
683 }
684
685 static struct rx_queue_attribute rps_cpus_attribute =
686         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
687
688
689 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
690         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
691             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
692
693 static struct attribute *rx_queue_default_attrs[] = {
694         &rps_cpus_attribute.attr,
695         &rps_dev_flow_table_cnt_attribute.attr,
696         NULL
697 };
698
699 static void rx_queue_release(struct kobject *kobj)
700 {
701         struct netdev_rx_queue *queue = to_rx_queue(kobj);
702         struct netdev_rx_queue *first = queue->first;
703
704         if (queue->rps_map)
705                 call_rcu(&queue->rps_map->rcu, rps_map_release);
706
707         if (queue->rps_flow_table)
708                 call_rcu(&queue->rps_flow_table->rcu,
709                     rps_dev_flow_table_release);
710
711         if (atomic_dec_and_test(&first->count))
712                 kfree(first);
713 }
714
715 static struct kobj_type rx_queue_ktype = {
716         .sysfs_ops = &rx_queue_sysfs_ops,
717         .release = rx_queue_release,
718         .default_attrs = rx_queue_default_attrs,
719 };
720
721 static int rx_queue_add_kobject(struct net_device *net, int index)
722 {
723         struct netdev_rx_queue *queue = net->_rx + index;
724         struct kobject *kobj = &queue->kobj;
725         int error = 0;
726
727         kobj->kset = net->queues_kset;
728         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
729             "rx-%u", index);
730         if (error) {
731                 kobject_put(kobj);
732                 return error;
733         }
734
735         kobject_uevent(kobj, KOBJ_ADD);
736
737         return error;
738 }
739
740 static int rx_queue_register_kobjects(struct net_device *net)
741 {
742         int i;
743         int error = 0;
744
745         net->queues_kset = kset_create_and_add("queues",
746             NULL, &net->dev.kobj);
747         if (!net->queues_kset)
748                 return -ENOMEM;
749         for (i = 0; i < net->num_rx_queues; i++) {
750                 error = rx_queue_add_kobject(net, i);
751                 if (error)
752                         break;
753         }
754
755         if (error)
756                 while (--i >= 0)
757                         kobject_put(&net->_rx[i].kobj);
758
759         return error;
760 }
761
762 static void rx_queue_remove_kobjects(struct net_device *net)
763 {
764         int i;
765
766         for (i = 0; i < net->num_rx_queues; i++)
767                 kobject_put(&net->_rx[i].kobj);
768         kset_unregister(net->queues_kset);
769 }
770 #endif /* CONFIG_RPS */
771
772 static const void *net_current_ns(void)
773 {
774         return current->nsproxy->net_ns;
775 }
776
777 static const void *net_initial_ns(void)
778 {
779         return &init_net;
780 }
781
782 static const void *net_netlink_ns(struct sock *sk)
783 {
784         return sock_net(sk);
785 }
786
787 static struct kobj_ns_type_operations net_ns_type_operations = {
788         .type = KOBJ_NS_TYPE_NET,
789         .current_ns = net_current_ns,
790         .netlink_ns = net_netlink_ns,
791         .initial_ns = net_initial_ns,
792 };
793
794 static void net_kobj_ns_exit(struct net *net)
795 {
796         kobj_ns_exit(KOBJ_NS_TYPE_NET, net);
797 }
798
799 static struct pernet_operations sysfs_net_ops = {
800         .exit = net_kobj_ns_exit,
801 };
802
803 #endif /* CONFIG_SYSFS */
804
805 #ifdef CONFIG_HOTPLUG
806 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
807 {
808         struct net_device *dev = to_net_dev(d);
809         int retval;
810
811         if (!net_eq(dev_net(dev), &init_net))
812                 return 0;
813
814         /* pass interface to uevent. */
815         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
816         if (retval)
817                 goto exit;
818
819         /* pass ifindex to uevent.
820          * ifindex is useful as it won't change (interface name may change)
821          * and is what RtNetlink uses natively. */
822         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
823
824 exit:
825         return retval;
826 }
827 #endif
828
829 /*
830  *      netdev_release -- destroy and free a dead device.
831  *      Called when last reference to device kobject is gone.
832  */
833 static void netdev_release(struct device *d)
834 {
835         struct net_device *dev = to_net_dev(d);
836
837         BUG_ON(dev->reg_state != NETREG_RELEASED);
838
839         kfree(dev->ifalias);
840         kfree((char *)dev - dev->padded);
841 }
842
843 static const void *net_namespace(struct device *d)
844 {
845         struct net_device *dev;
846         dev = container_of(d, struct net_device, dev);
847         return dev_net(dev);
848 }
849
850 static struct class net_class = {
851         .name = "net",
852         .dev_release = netdev_release,
853 #ifdef CONFIG_SYSFS
854         .dev_attrs = net_class_attributes,
855 #endif /* CONFIG_SYSFS */
856 #ifdef CONFIG_HOTPLUG
857         .dev_uevent = netdev_uevent,
858 #endif
859         .ns_type = &net_ns_type_operations,
860         .namespace = net_namespace,
861 };
862
863 /* Delete sysfs entries but hold kobject reference until after all
864  * netdev references are gone.
865  */
866 void netdev_unregister_kobject(struct net_device * net)
867 {
868         struct device *dev = &(net->dev);
869
870         kobject_get(&dev->kobj);
871
872         if (!net_eq(dev_net(net), &init_net))
873                 return;
874
875 #ifdef CONFIG_RPS
876         rx_queue_remove_kobjects(net);
877 #endif
878
879         device_del(dev);
880 }
881
882 /* Create sysfs entries for network device. */
883 int netdev_register_kobject(struct net_device *net)
884 {
885         struct device *dev = &(net->dev);
886         const struct attribute_group **groups = net->sysfs_groups;
887         int error = 0;
888
889         dev->class = &net_class;
890         dev->platform_data = net;
891         dev->groups = groups;
892
893         dev_set_name(dev, "%s", net->name);
894
895 #ifdef CONFIG_SYSFS
896         /* Allow for a device specific group */
897         if (*groups)
898                 groups++;
899
900         *groups++ = &netstat_group;
901 #ifdef CONFIG_WIRELESS_EXT_SYSFS
902         if (net->ieee80211_ptr)
903                 *groups++ = &wireless_group;
904 #ifdef CONFIG_WIRELESS_EXT
905         else if (net->wireless_handlers)
906                 *groups++ = &wireless_group;
907 #endif
908 #endif
909 #endif /* CONFIG_SYSFS */
910
911         if (!net_eq(dev_net(net), &init_net))
912                 return 0;
913
914         error = device_add(dev);
915         if (error)
916                 return error;
917
918 #ifdef CONFIG_RPS
919         error = rx_queue_register_kobjects(net);
920         if (error) {
921                 device_del(dev);
922                 return error;
923         }
924 #endif
925
926         return error;
927 }
928
929 int netdev_class_create_file(struct class_attribute *class_attr)
930 {
931         return class_create_file(&net_class, class_attr);
932 }
933
934 void netdev_class_remove_file(struct class_attribute *class_attr)
935 {
936         class_remove_file(&net_class, class_attr);
937 }
938
939 EXPORT_SYMBOL(netdev_class_create_file);
940 EXPORT_SYMBOL(netdev_class_remove_file);
941
942 void netdev_initialize_kobject(struct net_device *net)
943 {
944         struct device *device = &(net->dev);
945         device_initialize(device);
946 }
947
948 int netdev_kobject_init(void)
949 {
950         kobj_ns_type_register(&net_ns_type_operations);
951 #ifdef CONFIG_SYSFS
952         register_pernet_subsys(&sysfs_net_ops);
953 #endif
954         return class_register(&net_class);
955 }