c57c4b228bb5b849599124e058322aabe8d203d8
[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 <net/sock.h>
18 #include <linux/rtnetlink.h>
19 #include <linux/wireless.h>
20 #include <linux/vmalloc.h>
21 #include <net/wext.h>
22
23 #include "net-sysfs.h"
24
25 #ifdef CONFIG_SYSFS
26 static const char fmt_hex[] = "%#x\n";
27 static const char fmt_long_hex[] = "%#lx\n";
28 static const char fmt_dec[] = "%d\n";
29 static const char fmt_ulong[] = "%lu\n";
30
31 static inline int dev_isalive(const struct net_device *dev)
32 {
33         return dev->reg_state <= NETREG_REGISTERED;
34 }
35
36 /* use same locking rules as GIF* ioctl's */
37 static ssize_t netdev_show(const struct device *dev,
38                            struct device_attribute *attr, char *buf,
39                            ssize_t (*format)(const struct net_device *, char *))
40 {
41         struct net_device *net = to_net_dev(dev);
42         ssize_t ret = -EINVAL;
43
44         read_lock(&dev_base_lock);
45         if (dev_isalive(net))
46                 ret = (*format)(net, buf);
47         read_unlock(&dev_base_lock);
48
49         return ret;
50 }
51
52 /* generate a show function for simple field */
53 #define NETDEVICE_SHOW(field, format_string)                            \
54 static ssize_t format_##field(const struct net_device *net, char *buf)  \
55 {                                                                       \
56         return sprintf(buf, format_string, net->field);                 \
57 }                                                                       \
58 static ssize_t show_##field(struct device *dev,                         \
59                             struct device_attribute *attr, char *buf)   \
60 {                                                                       \
61         return netdev_show(dev, attr, buf, format_##field);             \
62 }
63
64
65 /* use same locking and permission rules as SIF* ioctl's */
66 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
67                             const char *buf, size_t len,
68                             int (*set)(struct net_device *, unsigned long))
69 {
70         struct net_device *net = to_net_dev(dev);
71         char *endp;
72         unsigned long new;
73         int ret = -EINVAL;
74
75         if (!capable(CAP_NET_ADMIN))
76                 return -EPERM;
77
78         new = simple_strtoul(buf, &endp, 0);
79         if (endp == buf)
80                 goto err;
81
82         if (!rtnl_trylock())
83                 return restart_syscall();
84
85         if (dev_isalive(net)) {
86                 if ((ret = (*set)(net, new)) == 0)
87                         ret = len;
88         }
89         rtnl_unlock();
90  err:
91         return ret;
92 }
93
94 NETDEVICE_SHOW(dev_id, fmt_hex);
95 NETDEVICE_SHOW(addr_len, fmt_dec);
96 NETDEVICE_SHOW(iflink, fmt_dec);
97 NETDEVICE_SHOW(ifindex, fmt_dec);
98 NETDEVICE_SHOW(features, fmt_long_hex);
99 NETDEVICE_SHOW(type, fmt_dec);
100 NETDEVICE_SHOW(link_mode, fmt_dec);
101
102 /* use same locking rules as GIFHWADDR ioctl's */
103 static ssize_t show_address(struct device *dev, struct device_attribute *attr,
104                             char *buf)
105 {
106         struct net_device *net = to_net_dev(dev);
107         ssize_t ret = -EINVAL;
108
109         read_lock(&dev_base_lock);
110         if (dev_isalive(net))
111                 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
112         read_unlock(&dev_base_lock);
113         return ret;
114 }
115
116 static ssize_t show_broadcast(struct device *dev,
117                             struct device_attribute *attr, char *buf)
118 {
119         struct net_device *net = to_net_dev(dev);
120         if (dev_isalive(net))
121                 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
122         return -EINVAL;
123 }
124
125 static ssize_t show_carrier(struct device *dev,
126                             struct device_attribute *attr, char *buf)
127 {
128         struct net_device *netdev = to_net_dev(dev);
129         if (netif_running(netdev)) {
130                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
131         }
132         return -EINVAL;
133 }
134
135 static ssize_t show_speed(struct device *dev,
136                           struct device_attribute *attr, char *buf)
137 {
138         struct net_device *netdev = to_net_dev(dev);
139         int ret = -EINVAL;
140
141         if (!rtnl_trylock())
142                 return restart_syscall();
143
144         if (netif_running(netdev) &&
145             netdev->ethtool_ops &&
146             netdev->ethtool_ops->get_settings) {
147                 struct ethtool_cmd cmd = { ETHTOOL_GSET };
148
149                 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
150                         ret = sprintf(buf, fmt_dec, ethtool_cmd_speed(&cmd));
151         }
152         rtnl_unlock();
153         return ret;
154 }
155
156 static ssize_t show_duplex(struct device *dev,
157                            struct device_attribute *attr, char *buf)
158 {
159         struct net_device *netdev = to_net_dev(dev);
160         int ret = -EINVAL;
161
162         if (!rtnl_trylock())
163                 return restart_syscall();
164
165         if (netif_running(netdev) &&
166             netdev->ethtool_ops &&
167             netdev->ethtool_ops->get_settings) {
168                 struct ethtool_cmd cmd = { ETHTOOL_GSET };
169
170                 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
171                         ret = sprintf(buf, "%s\n", 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 static struct device_attribute net_class_attributes[] = {
295         __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
296         __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
297         __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
298         __ATTR(iflink, S_IRUGO, show_iflink, NULL),
299         __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
300         __ATTR(features, S_IRUGO, show_features, NULL),
301         __ATTR(type, S_IRUGO, show_type, NULL),
302         __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
303         __ATTR(address, S_IRUGO, show_address, NULL),
304         __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
305         __ATTR(carrier, S_IRUGO, show_carrier, NULL),
306         __ATTR(speed, S_IRUGO, show_speed, NULL),
307         __ATTR(duplex, S_IRUGO, show_duplex, NULL),
308         __ATTR(dormant, S_IRUGO, show_dormant, NULL),
309         __ATTR(operstate, S_IRUGO, show_operstate, NULL),
310         __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
311         __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
312         __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
313                store_tx_queue_len),
314         {}
315 };
316
317 /* Show a given an attribute in the statistics group */
318 static ssize_t netstat_show(const struct device *d,
319                             struct device_attribute *attr, char *buf,
320                             unsigned long offset)
321 {
322         struct net_device *dev = to_net_dev(d);
323         ssize_t ret = -EINVAL;
324
325         WARN_ON(offset > sizeof(struct net_device_stats) ||
326                         offset % sizeof(unsigned long) != 0);
327
328         read_lock(&dev_base_lock);
329         if (dev_isalive(dev)) {
330                 const struct net_device_stats *stats = dev_get_stats(dev);
331                 ret = sprintf(buf, fmt_ulong,
332                               *(unsigned long *)(((u8 *) stats) + offset));
333         }
334         read_unlock(&dev_base_lock);
335         return ret;
336 }
337
338 /* generate a read-only statistics attribute */
339 #define NETSTAT_ENTRY(name)                                             \
340 static ssize_t show_##name(struct device *d,                            \
341                            struct device_attribute *attr, char *buf)    \
342 {                                                                       \
343         return netstat_show(d, attr, buf,                               \
344                             offsetof(struct net_device_stats, name));   \
345 }                                                                       \
346 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
347
348 NETSTAT_ENTRY(rx_packets);
349 NETSTAT_ENTRY(tx_packets);
350 NETSTAT_ENTRY(rx_bytes);
351 NETSTAT_ENTRY(tx_bytes);
352 NETSTAT_ENTRY(rx_errors);
353 NETSTAT_ENTRY(tx_errors);
354 NETSTAT_ENTRY(rx_dropped);
355 NETSTAT_ENTRY(tx_dropped);
356 NETSTAT_ENTRY(multicast);
357 NETSTAT_ENTRY(collisions);
358 NETSTAT_ENTRY(rx_length_errors);
359 NETSTAT_ENTRY(rx_over_errors);
360 NETSTAT_ENTRY(rx_crc_errors);
361 NETSTAT_ENTRY(rx_frame_errors);
362 NETSTAT_ENTRY(rx_fifo_errors);
363 NETSTAT_ENTRY(rx_missed_errors);
364 NETSTAT_ENTRY(tx_aborted_errors);
365 NETSTAT_ENTRY(tx_carrier_errors);
366 NETSTAT_ENTRY(tx_fifo_errors);
367 NETSTAT_ENTRY(tx_heartbeat_errors);
368 NETSTAT_ENTRY(tx_window_errors);
369 NETSTAT_ENTRY(rx_compressed);
370 NETSTAT_ENTRY(tx_compressed);
371
372 static struct attribute *netstat_attrs[] = {
373         &dev_attr_rx_packets.attr,
374         &dev_attr_tx_packets.attr,
375         &dev_attr_rx_bytes.attr,
376         &dev_attr_tx_bytes.attr,
377         &dev_attr_rx_errors.attr,
378         &dev_attr_tx_errors.attr,
379         &dev_attr_rx_dropped.attr,
380         &dev_attr_tx_dropped.attr,
381         &dev_attr_multicast.attr,
382         &dev_attr_collisions.attr,
383         &dev_attr_rx_length_errors.attr,
384         &dev_attr_rx_over_errors.attr,
385         &dev_attr_rx_crc_errors.attr,
386         &dev_attr_rx_frame_errors.attr,
387         &dev_attr_rx_fifo_errors.attr,
388         &dev_attr_rx_missed_errors.attr,
389         &dev_attr_tx_aborted_errors.attr,
390         &dev_attr_tx_carrier_errors.attr,
391         &dev_attr_tx_fifo_errors.attr,
392         &dev_attr_tx_heartbeat_errors.attr,
393         &dev_attr_tx_window_errors.attr,
394         &dev_attr_rx_compressed.attr,
395         &dev_attr_tx_compressed.attr,
396         NULL
397 };
398
399
400 static struct attribute_group netstat_group = {
401         .name  = "statistics",
402         .attrs  = netstat_attrs,
403 };
404
405 #ifdef CONFIG_WIRELESS_EXT_SYSFS
406 /* helper function that does all the locking etc for wireless stats */
407 static ssize_t wireless_show(struct device *d, char *buf,
408                              ssize_t (*format)(const struct iw_statistics *,
409                                                char *))
410 {
411         struct net_device *dev = to_net_dev(d);
412         const struct iw_statistics *iw;
413         ssize_t ret = -EINVAL;
414
415         if (!rtnl_trylock())
416                 return restart_syscall();
417         if (dev_isalive(dev)) {
418                 iw = get_wireless_stats(dev);
419                 if (iw)
420                         ret = (*format)(iw, buf);
421         }
422         rtnl_unlock();
423
424         return ret;
425 }
426
427 /* show function template for wireless fields */
428 #define WIRELESS_SHOW(name, field, format_string)                       \
429 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
430 {                                                                       \
431         return sprintf(buf, format_string, iw->field);                  \
432 }                                                                       \
433 static ssize_t show_iw_##name(struct device *d,                         \
434                               struct device_attribute *attr, char *buf) \
435 {                                                                       \
436         return wireless_show(d, buf, format_iw_##name);                 \
437 }                                                                       \
438 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
439
440 WIRELESS_SHOW(status, status, fmt_hex);
441 WIRELESS_SHOW(link, qual.qual, fmt_dec);
442 WIRELESS_SHOW(level, qual.level, fmt_dec);
443 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
444 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
445 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
446 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
447 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
448 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
449 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
450
451 static struct attribute *wireless_attrs[] = {
452         &dev_attr_status.attr,
453         &dev_attr_link.attr,
454         &dev_attr_level.attr,
455         &dev_attr_noise.attr,
456         &dev_attr_nwid.attr,
457         &dev_attr_crypt.attr,
458         &dev_attr_fragment.attr,
459         &dev_attr_retries.attr,
460         &dev_attr_misc.attr,
461         &dev_attr_beacon.attr,
462         NULL
463 };
464
465 static struct attribute_group wireless_group = {
466         .name = "wireless",
467         .attrs = wireless_attrs,
468 };
469 #endif
470
471 #ifdef CONFIG_RPS
472 /*
473  * RX queue sysfs structures and functions.
474  */
475 struct rx_queue_attribute {
476         struct attribute attr;
477         ssize_t (*show)(struct netdev_rx_queue *queue,
478             struct rx_queue_attribute *attr, char *buf);
479         ssize_t (*store)(struct netdev_rx_queue *queue,
480             struct rx_queue_attribute *attr, const char *buf, size_t len);
481 };
482 #define to_rx_queue_attr(_attr) container_of(_attr,             \
483     struct rx_queue_attribute, attr)
484
485 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
486
487 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
488                                   char *buf)
489 {
490         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
491         struct netdev_rx_queue *queue = to_rx_queue(kobj);
492
493         if (!attribute->show)
494                 return -EIO;
495
496         return attribute->show(queue, attribute, buf);
497 }
498
499 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
500                                    const char *buf, size_t count)
501 {
502         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
503         struct netdev_rx_queue *queue = to_rx_queue(kobj);
504
505         if (!attribute->store)
506                 return -EIO;
507
508         return attribute->store(queue, attribute, buf, count);
509 }
510
511 static struct sysfs_ops rx_queue_sysfs_ops = {
512         .show = rx_queue_attr_show,
513         .store = rx_queue_attr_store,
514 };
515
516 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
517                             struct rx_queue_attribute *attribute, char *buf)
518 {
519         struct rps_map *map;
520         cpumask_var_t mask;
521         size_t len = 0;
522         int i;
523
524         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
525                 return -ENOMEM;
526
527         rcu_read_lock();
528         map = rcu_dereference(queue->rps_map);
529         if (map)
530                 for (i = 0; i < map->len; i++)
531                         cpumask_set_cpu(map->cpus[i], mask);
532
533         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
534         if (PAGE_SIZE - len < 3) {
535                 rcu_read_unlock();
536                 free_cpumask_var(mask);
537                 return -EINVAL;
538         }
539         rcu_read_unlock();
540
541         free_cpumask_var(mask);
542         len += sprintf(buf + len, "\n");
543         return len;
544 }
545
546 static void rps_map_release(struct rcu_head *rcu)
547 {
548         struct rps_map *map = container_of(rcu, struct rps_map, rcu);
549
550         kfree(map);
551 }
552
553 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
554                       struct rx_queue_attribute *attribute,
555                       const char *buf, size_t len)
556 {
557         struct rps_map *old_map, *map;
558         cpumask_var_t mask;
559         int err, cpu, i;
560         static DEFINE_SPINLOCK(rps_map_lock);
561
562         if (!capable(CAP_NET_ADMIN))
563                 return -EPERM;
564
565         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
566                 return -ENOMEM;
567
568         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
569         if (err) {
570                 free_cpumask_var(mask);
571                 return err;
572         }
573
574         map = kzalloc(max_t(unsigned,
575             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
576             GFP_KERNEL);
577         if (!map) {
578                 free_cpumask_var(mask);
579                 return -ENOMEM;
580         }
581
582         i = 0;
583         for_each_cpu_and(cpu, mask, cpu_online_mask)
584                 map->cpus[i++] = cpu;
585
586         if (i)
587                 map->len = i;
588         else {
589                 kfree(map);
590                 map = NULL;
591         }
592
593         spin_lock(&rps_map_lock);
594         old_map = queue->rps_map;
595         rcu_assign_pointer(queue->rps_map, map);
596         spin_unlock(&rps_map_lock);
597
598         if (old_map)
599                 call_rcu(&old_map->rcu, rps_map_release);
600
601         free_cpumask_var(mask);
602         return len;
603 }
604
605 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
606                                            struct rx_queue_attribute *attr,
607                                            char *buf)
608 {
609         struct rps_dev_flow_table *flow_table;
610         unsigned int val = 0;
611
612         rcu_read_lock();
613         flow_table = rcu_dereference(queue->rps_flow_table);
614         if (flow_table)
615                 val = flow_table->mask + 1;
616         rcu_read_unlock();
617
618         return sprintf(buf, "%u\n", val);
619 }
620
621 static void rps_dev_flow_table_release_work(struct work_struct *work)
622 {
623         struct rps_dev_flow_table *table = container_of(work,
624             struct rps_dev_flow_table, free_work);
625
626         vfree(table);
627 }
628
629 static void rps_dev_flow_table_release(struct rcu_head *rcu)
630 {
631         struct rps_dev_flow_table *table = container_of(rcu,
632             struct rps_dev_flow_table, rcu);
633
634         INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
635         schedule_work(&table->free_work);
636 }
637
638 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
639                                      struct rx_queue_attribute *attr,
640                                      const char *buf, size_t len)
641 {
642         unsigned int count;
643         char *endp;
644         struct rps_dev_flow_table *table, *old_table;
645         static DEFINE_SPINLOCK(rps_dev_flow_lock);
646
647         if (!capable(CAP_NET_ADMIN))
648                 return -EPERM;
649
650         count = simple_strtoul(buf, &endp, 0);
651         if (endp == buf)
652                 return -EINVAL;
653
654         if (count) {
655                 int i;
656
657                 if (count > 1<<30) {
658                         /* Enforce a limit to prevent overflow */
659                         return -EINVAL;
660                 }
661                 count = roundup_pow_of_two(count);
662                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
663                 if (!table)
664                         return -ENOMEM;
665
666                 table->mask = count - 1;
667                 for (i = 0; i < count; i++)
668                         table->flows[i].cpu = RPS_NO_CPU;
669         } else
670                 table = NULL;
671
672         spin_lock(&rps_dev_flow_lock);
673         old_table = queue->rps_flow_table;
674         rcu_assign_pointer(queue->rps_flow_table, table);
675         spin_unlock(&rps_dev_flow_lock);
676
677         if (old_table)
678                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
679
680         return len;
681 }
682
683 static struct rx_queue_attribute rps_cpus_attribute =
684         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
685
686
687 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
688         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
689             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
690
691 static struct attribute *rx_queue_default_attrs[] = {
692         &rps_cpus_attribute.attr,
693         &rps_dev_flow_table_cnt_attribute.attr,
694         NULL
695 };
696
697 static void rx_queue_release(struct kobject *kobj)
698 {
699         struct netdev_rx_queue *queue = to_rx_queue(kobj);
700         struct netdev_rx_queue *first = queue->first;
701
702         if (queue->rps_map)
703                 call_rcu(&queue->rps_map->rcu, rps_map_release);
704
705         if (queue->rps_flow_table)
706                 call_rcu(&queue->rps_flow_table->rcu,
707                     rps_dev_flow_table_release);
708
709         if (atomic_dec_and_test(&first->count))
710                 kfree(first);
711 }
712
713 static struct kobj_type rx_queue_ktype = {
714         .sysfs_ops = &rx_queue_sysfs_ops,
715         .release = rx_queue_release,
716         .default_attrs = rx_queue_default_attrs,
717 };
718
719 static int rx_queue_add_kobject(struct net_device *net, int index)
720 {
721         struct netdev_rx_queue *queue = net->_rx + index;
722         struct kobject *kobj = &queue->kobj;
723         int error = 0;
724
725         kobj->kset = net->queues_kset;
726         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
727             "rx-%u", index);
728         if (error) {
729                 kobject_put(kobj);
730                 return error;
731         }
732
733         kobject_uevent(kobj, KOBJ_ADD);
734
735         return error;
736 }
737
738 static int rx_queue_register_kobjects(struct net_device *net)
739 {
740         int i;
741         int error = 0;
742
743         net->queues_kset = kset_create_and_add("queues",
744             NULL, &net->dev.kobj);
745         if (!net->queues_kset)
746                 return -ENOMEM;
747         for (i = 0; i < net->num_rx_queues; i++) {
748                 error = rx_queue_add_kobject(net, i);
749                 if (error)
750                         break;
751         }
752
753         if (error)
754                 while (--i >= 0)
755                         kobject_put(&net->_rx[i].kobj);
756
757         return error;
758 }
759
760 static void rx_queue_remove_kobjects(struct net_device *net)
761 {
762         int i;
763
764         for (i = 0; i < net->num_rx_queues; i++)
765                 kobject_put(&net->_rx[i].kobj);
766         kset_unregister(net->queues_kset);
767 }
768 #endif /* CONFIG_RPS */
769 #endif /* CONFIG_SYSFS */
770
771 #ifdef CONFIG_HOTPLUG
772 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
773 {
774         struct net_device *dev = to_net_dev(d);
775         int retval;
776
777         if (!net_eq(dev_net(dev), &init_net))
778                 return 0;
779
780         /* pass interface to uevent. */
781         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
782         if (retval)
783                 goto exit;
784
785         /* pass ifindex to uevent.
786          * ifindex is useful as it won't change (interface name may change)
787          * and is what RtNetlink uses natively. */
788         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
789
790 exit:
791         return retval;
792 }
793 #endif
794
795 /*
796  *      netdev_release -- destroy and free a dead device.
797  *      Called when last reference to device kobject is gone.
798  */
799 static void netdev_release(struct device *d)
800 {
801         struct net_device *dev = to_net_dev(d);
802
803         BUG_ON(dev->reg_state != NETREG_RELEASED);
804
805         kfree(dev->ifalias);
806         kfree((char *)dev - dev->padded);
807 }
808
809 static struct class net_class = {
810         .name = "net",
811         .dev_release = netdev_release,
812 #ifdef CONFIG_SYSFS
813         .dev_attrs = net_class_attributes,
814 #endif /* CONFIG_SYSFS */
815 #ifdef CONFIG_HOTPLUG
816         .dev_uevent = netdev_uevent,
817 #endif
818 };
819
820 /* Delete sysfs entries but hold kobject reference until after all
821  * netdev references are gone.
822  */
823 void netdev_unregister_kobject(struct net_device * net)
824 {
825         struct device *dev = &(net->dev);
826
827         kobject_get(&dev->kobj);
828
829         if (!net_eq(dev_net(net), &init_net))
830                 return;
831
832 #ifdef CONFIG_RPS
833         rx_queue_remove_kobjects(net);
834 #endif
835
836         device_del(dev);
837 }
838
839 /* Create sysfs entries for network device. */
840 int netdev_register_kobject(struct net_device *net)
841 {
842         struct device *dev = &(net->dev);
843         const struct attribute_group **groups = net->sysfs_groups;
844         int error = 0;
845
846         dev->class = &net_class;
847         dev->platform_data = net;
848         dev->groups = groups;
849
850         dev_set_name(dev, "%s", net->name);
851
852 #ifdef CONFIG_SYSFS
853         /* Allow for a device specific group */
854         if (*groups)
855                 groups++;
856
857         *groups++ = &netstat_group;
858 #ifdef CONFIG_WIRELESS_EXT_SYSFS
859         if (net->ieee80211_ptr)
860                 *groups++ = &wireless_group;
861 #ifdef CONFIG_WIRELESS_EXT
862         else if (net->wireless_handlers)
863                 *groups++ = &wireless_group;
864 #endif
865 #endif
866 #endif /* CONFIG_SYSFS */
867
868         if (!net_eq(dev_net(net), &init_net))
869                 return 0;
870
871         error = device_add(dev);
872         if (error)
873                 return error;
874
875 #ifdef CONFIG_RPS
876         error = rx_queue_register_kobjects(net);
877         if (error) {
878                 device_del(dev);
879                 return error;
880         }
881 #endif
882
883         return error;
884 }
885
886 int netdev_class_create_file(struct class_attribute *class_attr)
887 {
888         return class_create_file(&net_class, class_attr);
889 }
890
891 void netdev_class_remove_file(struct class_attribute *class_attr)
892 {
893         class_remove_file(&net_class, class_attr);
894 }
895
896 EXPORT_SYMBOL(netdev_class_create_file);
897 EXPORT_SYMBOL(netdev_class_remove_file);
898
899 void netdev_initialize_kobject(struct net_device *net)
900 {
901         struct device *device = &(net->dev);
902         device_initialize(device);
903 }
904
905 int netdev_kobject_init(void)
906 {
907         return class_register(&net_class);
908 }