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