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FRV: Use generic show_interrupts()
[cris-mirror.git] / net / core / net-sysfs.c
blob5ceb257e860c18cbabe352f67cb8760d95bcba84
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 static const char fmt_u64[] = "%llu\n";
33
34 static inline int dev_isalive(const struct net_device *dev)
35 {
36 return dev->reg_state <= NETREG_REGISTERED;
37 }
38
39 /* use same locking rules as GIF* ioctl's */
40 static ssize_t netdev_show(const struct device *dev,
41 struct device_attribute *attr, char *buf,
42 ssize_t (*format)(const struct net_device *, char *))
43 {
44 struct net_device *net = to_net_dev(dev);
45 ssize_t ret = -EINVAL;
46
47 read_lock(&dev_base_lock);
48 if (dev_isalive(net))
49 ret = (*format)(net, buf);
50 read_unlock(&dev_base_lock);
51
52 return ret;
53 }
54
55 /* generate a show function for simple field */
56 #define NETDEVICE_SHOW(field, format_string) \
57 static ssize_t format_##field(const struct net_device *net, char *buf) \
58 { \
59 return sprintf(buf, format_string, net->field); \
60 } \
61 static ssize_t show_##field(struct device *dev, \
62 struct device_attribute *attr, char *buf) \
63 { \
64 return netdev_show(dev, attr, buf, format_##field); \
65 }
66
67
68 /* use same locking and permission rules as SIF* ioctl's */
69 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
70 const char *buf, size_t len,
71 int (*set)(struct net_device *, unsigned long))
72 {
73 struct net_device *net = to_net_dev(dev);
74 char *endp;
75 unsigned long new;
76 int ret = -EINVAL;
77
78 if (!capable(CAP_NET_ADMIN))
79 return -EPERM;
80
81 new = simple_strtoul(buf, &endp, 0);
82 if (endp == buf)
83 goto err;
84
85 if (!rtnl_trylock())
86 return restart_syscall();
87
88 if (dev_isalive(net)) {
89 if ((ret = (*set)(net, new)) == 0)
90 ret = len;
91 }
92 rtnl_unlock();
93 err:
94 return ret;
95 }
96
97 NETDEVICE_SHOW(dev_id, fmt_hex);
98 NETDEVICE_SHOW(addr_assign_type, fmt_dec);
99 NETDEVICE_SHOW(addr_len, fmt_dec);
100 NETDEVICE_SHOW(iflink, fmt_dec);
101 NETDEVICE_SHOW(ifindex, fmt_dec);
102 NETDEVICE_SHOW(features, fmt_hex);
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 netdev->ethtool_ops &&
150 netdev->ethtool_ops->get_settings) {
151 struct ethtool_cmd cmd = { ETHTOOL_GSET };
152
153 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
154 ret = sprintf(buf, fmt_dec, ethtool_cmd_speed(&cmd));
155 }
156 rtnl_unlock();
157 return ret;
158 }
159
160 static ssize_t show_duplex(struct device *dev,
161 struct device_attribute *attr, char *buf)
162 {
163 struct net_device *netdev = to_net_dev(dev);
164 int ret = -EINVAL;
165
166 if (!rtnl_trylock())
167 return restart_syscall();
168
169 if (netif_running(netdev) &&
170 netdev->ethtool_ops &&
171 netdev->ethtool_ops->get_settings) {
172 struct ethtool_cmd cmd = { ETHTOOL_GSET };
173
174 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
175 ret = sprintf(buf, "%s\n", cmd.duplex ? "full" : "half");
176 }
177 rtnl_unlock();
178 return ret;
179 }
180
181 static ssize_t show_dormant(struct device *dev,
182 struct device_attribute *attr, char *buf)
183 {
184 struct net_device *netdev = to_net_dev(dev);
185
186 if (netif_running(netdev))
187 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
188
189 return -EINVAL;
190 }
191
192 static const char *const operstates[] = {
193 "unknown",
194 "notpresent", /* currently unused */
195 "down",
196 "lowerlayerdown",
197 "testing", /* currently unused */
198 "dormant",
199 "up"
200 };
201
202 static ssize_t show_operstate(struct device *dev,
203 struct device_attribute *attr, char *buf)
204 {
205 const struct net_device *netdev = to_net_dev(dev);
206 unsigned char operstate;
207
208 read_lock(&dev_base_lock);
209 operstate = netdev->operstate;
210 if (!netif_running(netdev))
211 operstate = IF_OPER_DOWN;
212 read_unlock(&dev_base_lock);
213
214 if (operstate >= ARRAY_SIZE(operstates))
215 return -EINVAL; /* should not happen */
216
217 return sprintf(buf, "%s\n", operstates[operstate]);
218 }
219
220 /* read-write attributes */
221 NETDEVICE_SHOW(mtu, fmt_dec);
222
223 static int change_mtu(struct net_device *net, unsigned long new_mtu)
224 {
225 return dev_set_mtu(net, (int) new_mtu);
226 }
227
228 static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
229 const char *buf, size_t len)
230 {
231 return netdev_store(dev, attr, buf, len, change_mtu);
232 }
233
234 NETDEVICE_SHOW(flags, fmt_hex);
235
236 static int change_flags(struct net_device *net, unsigned long new_flags)
237 {
238 return dev_change_flags(net, (unsigned) new_flags);
239 }
240
241 static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
242 const char *buf, size_t len)
243 {
244 return netdev_store(dev, attr, buf, len, change_flags);
245 }
246
247 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
248
249 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
250 {
251 net->tx_queue_len = new_len;
252 return 0;
253 }
254
255 static ssize_t store_tx_queue_len(struct device *dev,
256 struct device_attribute *attr,
257 const char *buf, size_t len)
258 {
259 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
260 }
261
262 static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
263 const char *buf, size_t len)
264 {
265 struct net_device *netdev = to_net_dev(dev);
266 size_t count = len;
267 ssize_t ret;
268
269 if (!capable(CAP_NET_ADMIN))
270 return -EPERM;
271
272 /* ignore trailing newline */
273 if (len > 0 && buf[len - 1] == '\n')
274 --count;
275
276 if (!rtnl_trylock())
277 return restart_syscall();
278 ret = dev_set_alias(netdev, buf, count);
279 rtnl_unlock();
280
281 return ret < 0 ? ret : len;
282 }
283
284 static ssize_t show_ifalias(struct device *dev,
285 struct device_attribute *attr, char *buf)
286 {
287 const struct net_device *netdev = to_net_dev(dev);
288 ssize_t ret = 0;
289
290 if (!rtnl_trylock())
291 return restart_syscall();
292 if (netdev->ifalias)
293 ret = sprintf(buf, "%s\n", netdev->ifalias);
294 rtnl_unlock();
295 return ret;
296 }
297
298 NETDEVICE_SHOW(group, fmt_dec);
299
300 static int change_group(struct net_device *net, unsigned long new_group)
301 {
302 dev_set_group(net, (int) new_group);
303 return 0;
304 }
305
306 static ssize_t store_group(struct device *dev, struct device_attribute *attr,
307 const char *buf, size_t len)
308 {
309 return netdev_store(dev, attr, buf, len, change_group);
310 }
311
312 static struct device_attribute net_class_attributes[] = {
313 __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
314 __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
315 __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
316 __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
317 __ATTR(iflink, S_IRUGO, show_iflink, NULL),
318 __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
319 __ATTR(features, S_IRUGO, show_features, NULL),
320 __ATTR(type, S_IRUGO, show_type, NULL),
321 __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
322 __ATTR(address, S_IRUGO, show_address, NULL),
323 __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
324 __ATTR(carrier, S_IRUGO, show_carrier, NULL),
325 __ATTR(speed, S_IRUGO, show_speed, NULL),
326 __ATTR(duplex, S_IRUGO, show_duplex, NULL),
327 __ATTR(dormant, S_IRUGO, show_dormant, NULL),
328 __ATTR(operstate, S_IRUGO, show_operstate, NULL),
329 __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
330 __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
331 __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
332 store_tx_queue_len),
333 __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
334 {}
335 };
336
337 /* Show a given an attribute in the statistics group */
338 static ssize_t netstat_show(const struct device *d,
339 struct device_attribute *attr, char *buf,
340 unsigned long offset)
341 {
342 struct net_device *dev = to_net_dev(d);
343 ssize_t ret = -EINVAL;
344
345 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
346 offset % sizeof(u64) != 0);
347
348 read_lock(&dev_base_lock);
349 if (dev_isalive(dev)) {
350 struct rtnl_link_stats64 temp;
351 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
352
353 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
354 }
355 read_unlock(&dev_base_lock);
356 return ret;
357 }
358
359 /* generate a read-only statistics attribute */
360 #define NETSTAT_ENTRY(name) \
361 static ssize_t show_##name(struct device *d, \
362 struct device_attribute *attr, char *buf) \
363 { \
364 return netstat_show(d, attr, buf, \
365 offsetof(struct rtnl_link_stats64, name)); \
366 } \
367 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
368
369 NETSTAT_ENTRY(rx_packets);
370 NETSTAT_ENTRY(tx_packets);
371 NETSTAT_ENTRY(rx_bytes);
372 NETSTAT_ENTRY(tx_bytes);
373 NETSTAT_ENTRY(rx_errors);
374 NETSTAT_ENTRY(tx_errors);
375 NETSTAT_ENTRY(rx_dropped);
376 NETSTAT_ENTRY(tx_dropped);
377 NETSTAT_ENTRY(multicast);
378 NETSTAT_ENTRY(collisions);
379 NETSTAT_ENTRY(rx_length_errors);
380 NETSTAT_ENTRY(rx_over_errors);
381 NETSTAT_ENTRY(rx_crc_errors);
382 NETSTAT_ENTRY(rx_frame_errors);
383 NETSTAT_ENTRY(rx_fifo_errors);
384 NETSTAT_ENTRY(rx_missed_errors);
385 NETSTAT_ENTRY(tx_aborted_errors);
386 NETSTAT_ENTRY(tx_carrier_errors);
387 NETSTAT_ENTRY(tx_fifo_errors);
388 NETSTAT_ENTRY(tx_heartbeat_errors);
389 NETSTAT_ENTRY(tx_window_errors);
390 NETSTAT_ENTRY(rx_compressed);
391 NETSTAT_ENTRY(tx_compressed);
392
393 static struct attribute *netstat_attrs[] = {
394 &dev_attr_rx_packets.attr,
395 &dev_attr_tx_packets.attr,
396 &dev_attr_rx_bytes.attr,
397 &dev_attr_tx_bytes.attr,
398 &dev_attr_rx_errors.attr,
399 &dev_attr_tx_errors.attr,
400 &dev_attr_rx_dropped.attr,
401 &dev_attr_tx_dropped.attr,
402 &dev_attr_multicast.attr,
403 &dev_attr_collisions.attr,
404 &dev_attr_rx_length_errors.attr,
405 &dev_attr_rx_over_errors.attr,
406 &dev_attr_rx_crc_errors.attr,
407 &dev_attr_rx_frame_errors.attr,
408 &dev_attr_rx_fifo_errors.attr,
409 &dev_attr_rx_missed_errors.attr,
410 &dev_attr_tx_aborted_errors.attr,
411 &dev_attr_tx_carrier_errors.attr,
412 &dev_attr_tx_fifo_errors.attr,
413 &dev_attr_tx_heartbeat_errors.attr,
414 &dev_attr_tx_window_errors.attr,
415 &dev_attr_rx_compressed.attr,
416 &dev_attr_tx_compressed.attr,
417 NULL
418 };
419
420
421 static struct attribute_group netstat_group = {
422 .name = "statistics",
423 .attrs = netstat_attrs,
424 };
425
426 #ifdef CONFIG_WIRELESS_EXT_SYSFS
427 /* helper function that does all the locking etc for wireless stats */
428 static ssize_t wireless_show(struct device *d, char *buf,
429 ssize_t (*format)(const struct iw_statistics *,
430 char *))
431 {
432 struct net_device *dev = to_net_dev(d);
433 const struct iw_statistics *iw;
434 ssize_t ret = -EINVAL;
435
436 if (!rtnl_trylock())
437 return restart_syscall();
438 if (dev_isalive(dev)) {
439 iw = get_wireless_stats(dev);
440 if (iw)
441 ret = (*format)(iw, buf);
442 }
443 rtnl_unlock();
444
445 return ret;
446 }
447
448 /* show function template for wireless fields */
449 #define WIRELESS_SHOW(name, field, format_string) \
450 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
451 { \
452 return sprintf(buf, format_string, iw->field); \
453 } \
454 static ssize_t show_iw_##name(struct device *d, \
455 struct device_attribute *attr, char *buf) \
456 { \
457 return wireless_show(d, buf, format_iw_##name); \
458 } \
459 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
460
461 WIRELESS_SHOW(status, status, fmt_hex);
462 WIRELESS_SHOW(link, qual.qual, fmt_dec);
463 WIRELESS_SHOW(level, qual.level, fmt_dec);
464 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
465 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
466 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
467 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
468 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
469 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
470 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
471
472 static struct attribute *wireless_attrs[] = {
473 &dev_attr_status.attr,
474 &dev_attr_link.attr,
475 &dev_attr_level.attr,
476 &dev_attr_noise.attr,
477 &dev_attr_nwid.attr,
478 &dev_attr_crypt.attr,
479 &dev_attr_fragment.attr,
480 &dev_attr_retries.attr,
481 &dev_attr_misc.attr,
482 &dev_attr_beacon.attr,
483 NULL
484 };
485
486 static struct attribute_group wireless_group = {
487 .name = "wireless",
488 .attrs = wireless_attrs,
489 };
490 #endif
491 #endif /* CONFIG_SYSFS */
492
493 #ifdef CONFIG_RPS
494 /*
495 * RX queue sysfs structures and functions.
496 */
497 struct rx_queue_attribute {
498 struct attribute attr;
499 ssize_t (*show)(struct netdev_rx_queue *queue,
500 struct rx_queue_attribute *attr, char *buf);
501 ssize_t (*store)(struct netdev_rx_queue *queue,
502 struct rx_queue_attribute *attr, const char *buf, size_t len);
503 };
504 #define to_rx_queue_attr(_attr) container_of(_attr, \
505 struct rx_queue_attribute, attr)
506
507 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
508
509 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
510 char *buf)
511 {
512 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
513 struct netdev_rx_queue *queue = to_rx_queue(kobj);
514
515 if (!attribute->show)
516 return -EIO;
517
518 return attribute->show(queue, attribute, buf);
519 }
520
521 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
522 const char *buf, size_t count)
523 {
524 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
525 struct netdev_rx_queue *queue = to_rx_queue(kobj);
526
527 if (!attribute->store)
528 return -EIO;
529
530 return attribute->store(queue, attribute, buf, count);
531 }
532
533 static const struct sysfs_ops rx_queue_sysfs_ops = {
534 .show = rx_queue_attr_show,
535 .store = rx_queue_attr_store,
536 };
537
538 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
539 struct rx_queue_attribute *attribute, char *buf)
540 {
541 struct rps_map *map;
542 cpumask_var_t mask;
543 size_t len = 0;
544 int i;
545
546 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
547 return -ENOMEM;
548
549 rcu_read_lock();
550 map = rcu_dereference(queue->rps_map);
551 if (map)
552 for (i = 0; i < map->len; i++)
553 cpumask_set_cpu(map->cpus[i], mask);
554
555 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
556 if (PAGE_SIZE - len < 3) {
557 rcu_read_unlock();
558 free_cpumask_var(mask);
559 return -EINVAL;
560 }
561 rcu_read_unlock();
562
563 free_cpumask_var(mask);
564 len += sprintf(buf + len, "\n");
565 return len;
566 }
567
568 static void rps_map_release(struct rcu_head *rcu)
569 {
570 struct rps_map *map = container_of(rcu, struct rps_map, rcu);
571
572 kfree(map);
573 }
574
575 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
576 struct rx_queue_attribute *attribute,
577 const char *buf, size_t len)
578 {
579 struct rps_map *old_map, *map;
580 cpumask_var_t mask;
581 int err, cpu, i;
582 static DEFINE_SPINLOCK(rps_map_lock);
583
584 if (!capable(CAP_NET_ADMIN))
585 return -EPERM;
586
587 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
588 return -ENOMEM;
589
590 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
591 if (err) {
592 free_cpumask_var(mask);
593 return err;
594 }
595
596 map = kzalloc(max_t(unsigned,
597 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
598 GFP_KERNEL);
599 if (!map) {
600 free_cpumask_var(mask);
601 return -ENOMEM;
602 }
603
604 i = 0;
605 for_each_cpu_and(cpu, mask, cpu_online_mask)
606 map->cpus[i++] = cpu;
607
608 if (i)
609 map->len = i;
610 else {
611 kfree(map);
612 map = NULL;
613 }
614
615 spin_lock(&rps_map_lock);
616 old_map = rcu_dereference_protected(queue->rps_map,
617 lockdep_is_held(&rps_map_lock));
618 rcu_assign_pointer(queue->rps_map, map);
619 spin_unlock(&rps_map_lock);
620
621 if (old_map)
622 call_rcu(&old_map->rcu, rps_map_release);
623
624 free_cpumask_var(mask);
625 return len;
626 }
627
628 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
629 struct rx_queue_attribute *attr,
630 char *buf)
631 {
632 struct rps_dev_flow_table *flow_table;
633 unsigned int val = 0;
634
635 rcu_read_lock();
636 flow_table = rcu_dereference(queue->rps_flow_table);
637 if (flow_table)
638 val = flow_table->mask + 1;
639 rcu_read_unlock();
640
641 return sprintf(buf, "%u\n", val);
642 }
643
644 static void rps_dev_flow_table_release_work(struct work_struct *work)
645 {
646 struct rps_dev_flow_table *table = container_of(work,
647 struct rps_dev_flow_table, free_work);
648
649 vfree(table);
650 }
651
652 static void rps_dev_flow_table_release(struct rcu_head *rcu)
653 {
654 struct rps_dev_flow_table *table = container_of(rcu,
655 struct rps_dev_flow_table, rcu);
656
657 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
658 schedule_work(&table->free_work);
659 }
660
661 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
662 struct rx_queue_attribute *attr,
663 const char *buf, size_t len)
664 {
665 unsigned int count;
666 char *endp;
667 struct rps_dev_flow_table *table, *old_table;
668 static DEFINE_SPINLOCK(rps_dev_flow_lock);
669
670 if (!capable(CAP_NET_ADMIN))
671 return -EPERM;
672
673 count = simple_strtoul(buf, &endp, 0);
674 if (endp == buf)
675 return -EINVAL;
676
677 if (count) {
678 int i;
679
680 if (count > 1<<30) {
681 /* Enforce a limit to prevent overflow */
682 return -EINVAL;
683 }
684 count = roundup_pow_of_two(count);
685 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
686 if (!table)
687 return -ENOMEM;
688
689 table->mask = count - 1;
690 for (i = 0; i < count; i++)
691 table->flows[i].cpu = RPS_NO_CPU;
692 } else
693 table = NULL;
694
695 spin_lock(&rps_dev_flow_lock);
696 old_table = rcu_dereference_protected(queue->rps_flow_table,
697 lockdep_is_held(&rps_dev_flow_lock));
698 rcu_assign_pointer(queue->rps_flow_table, table);
699 spin_unlock(&rps_dev_flow_lock);
700
701 if (old_table)
702 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
703
704 return len;
705 }
706
707 static struct rx_queue_attribute rps_cpus_attribute =
708 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
709
710
711 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
712 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
713 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
714
715 static struct attribute *rx_queue_default_attrs[] = {
716 &rps_cpus_attribute.attr,
717 &rps_dev_flow_table_cnt_attribute.attr,
718 NULL
719 };
720
721 static void rx_queue_release(struct kobject *kobj)
722 {
723 struct netdev_rx_queue *queue = to_rx_queue(kobj);
724 struct rps_map *map;
725 struct rps_dev_flow_table *flow_table;
726
727
728 map = rcu_dereference_raw(queue->rps_map);
729 if (map) {
730 RCU_INIT_POINTER(queue->rps_map, NULL);
731 call_rcu(&map->rcu, rps_map_release);
732 }
733
734 flow_table = rcu_dereference_raw(queue->rps_flow_table);
735 if (flow_table) {
736 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
737 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
738 }
739
740 memset(kobj, 0, sizeof(*kobj));
741 dev_put(queue->dev);
742 }
743
744 static struct kobj_type rx_queue_ktype = {
745 .sysfs_ops = &rx_queue_sysfs_ops,
746 .release = rx_queue_release,
747 .default_attrs = rx_queue_default_attrs,
748 };
749
750 static int rx_queue_add_kobject(struct net_device *net, int index)
751 {
752 struct netdev_rx_queue *queue = net->_rx + index;
753 struct kobject *kobj = &queue->kobj;
754 int error = 0;
755
756 kobj->kset = net->queues_kset;
757 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
758 "rx-%u", index);
759 if (error) {
760 kobject_put(kobj);
761 return error;
762 }
763
764 kobject_uevent(kobj, KOBJ_ADD);
765 dev_hold(queue->dev);
766
767 return error;
768 }
769 #endif /* CONFIG_RPS */
770
771 int
772 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
773 {
774 #ifdef CONFIG_RPS
775 int i;
776 int error = 0;
777
778 for (i = old_num; i < new_num; i++) {
779 error = rx_queue_add_kobject(net, i);
780 if (error) {
781 new_num = old_num;
782 break;
783 }
784 }
785
786 while (--i >= new_num)
787 kobject_put(&net->_rx[i].kobj);
788
789 return error;
790 #else
791 return 0;
792 #endif
793 }
794
795 #ifdef CONFIG_XPS
796 /*
797 * netdev_queue sysfs structures and functions.
798 */
799 struct netdev_queue_attribute {
800 struct attribute attr;
801 ssize_t (*show)(struct netdev_queue *queue,
802 struct netdev_queue_attribute *attr, char *buf);
803 ssize_t (*store)(struct netdev_queue *queue,
804 struct netdev_queue_attribute *attr, const char *buf, size_t len);
805 };
806 #define to_netdev_queue_attr(_attr) container_of(_attr, \
807 struct netdev_queue_attribute, attr)
808
809 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
810
811 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
812 struct attribute *attr, char *buf)
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->show)
818 return -EIO;
819
820 return attribute->show(queue, attribute, buf);
821 }
822
823 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
824 struct attribute *attr,
825 const char *buf, size_t count)
826 {
827 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
828 struct netdev_queue *queue = to_netdev_queue(kobj);
829
830 if (!attribute->store)
831 return -EIO;
832
833 return attribute->store(queue, attribute, buf, count);
834 }
835
836 static const struct sysfs_ops netdev_queue_sysfs_ops = {
837 .show = netdev_queue_attr_show,
838 .store = netdev_queue_attr_store,
839 };
840
841 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
842 {
843 struct net_device *dev = queue->dev;
844 int i;
845
846 for (i = 0; i < dev->num_tx_queues; i++)
847 if (queue == &dev->_tx[i])
848 break;
849
850 BUG_ON(i >= dev->num_tx_queues);
851
852 return i;
853 }
854
855
856 static ssize_t show_xps_map(struct netdev_queue *queue,
857 struct netdev_queue_attribute *attribute, char *buf)
858 {
859 struct net_device *dev = queue->dev;
860 struct xps_dev_maps *dev_maps;
861 cpumask_var_t mask;
862 unsigned long index;
863 size_t len = 0;
864 int i;
865
866 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
867 return -ENOMEM;
868
869 index = get_netdev_queue_index(queue);
870
871 rcu_read_lock();
872 dev_maps = rcu_dereference(dev->xps_maps);
873 if (dev_maps) {
874 for_each_possible_cpu(i) {
875 struct xps_map *map =
876 rcu_dereference(dev_maps->cpu_map[i]);
877 if (map) {
878 int j;
879 for (j = 0; j < map->len; j++) {
880 if (map->queues[j] == index) {
881 cpumask_set_cpu(i, mask);
882 break;
883 }
884 }
885 }
886 }
887 }
888 rcu_read_unlock();
889
890 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
891 if (PAGE_SIZE - len < 3) {
892 free_cpumask_var(mask);
893 return -EINVAL;
894 }
895
896 free_cpumask_var(mask);
897 len += sprintf(buf + len, "\n");
898 return len;
899 }
900
901 static void xps_map_release(struct rcu_head *rcu)
902 {
903 struct xps_map *map = container_of(rcu, struct xps_map, rcu);
904
905 kfree(map);
906 }
907
908 static void xps_dev_maps_release(struct rcu_head *rcu)
909 {
910 struct xps_dev_maps *dev_maps =
911 container_of(rcu, struct xps_dev_maps, rcu);
912
913 kfree(dev_maps);
914 }
915
916 static DEFINE_MUTEX(xps_map_mutex);
917 #define xmap_dereference(P) \
918 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
919
920 static ssize_t store_xps_map(struct netdev_queue *queue,
921 struct netdev_queue_attribute *attribute,
922 const char *buf, size_t len)
923 {
924 struct net_device *dev = queue->dev;
925 cpumask_var_t mask;
926 int err, i, cpu, pos, map_len, alloc_len, need_set;
927 unsigned long index;
928 struct xps_map *map, *new_map;
929 struct xps_dev_maps *dev_maps, *new_dev_maps;
930 int nonempty = 0;
931 int numa_node = -2;
932
933 if (!capable(CAP_NET_ADMIN))
934 return -EPERM;
935
936 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
937 return -ENOMEM;
938
939 index = get_netdev_queue_index(queue);
940
941 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
942 if (err) {
943 free_cpumask_var(mask);
944 return err;
945 }
946
947 new_dev_maps = kzalloc(max_t(unsigned,
948 XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
949 if (!new_dev_maps) {
950 free_cpumask_var(mask);
951 return -ENOMEM;
952 }
953
954 mutex_lock(&xps_map_mutex);
955
956 dev_maps = xmap_dereference(dev->xps_maps);
957
958 for_each_possible_cpu(cpu) {
959 map = dev_maps ?
960 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
961 new_map = map;
962 if (map) {
963 for (pos = 0; pos < map->len; pos++)
964 if (map->queues[pos] == index)
965 break;
966 map_len = map->len;
967 alloc_len = map->alloc_len;
968 } else
969 pos = map_len = alloc_len = 0;
970
971 need_set = cpu_isset(cpu, *mask) && cpu_online(cpu);
972 #ifdef CONFIG_NUMA
973 if (need_set) {
974 if (numa_node == -2)
975 numa_node = cpu_to_node(cpu);
976 else if (numa_node != cpu_to_node(cpu))
977 numa_node = -1;
978 }
979 #endif
980 if (need_set && pos >= map_len) {
981 /* Need to add queue to this CPU's map */
982 if (map_len >= alloc_len) {
983 alloc_len = alloc_len ?
984 2 * alloc_len : XPS_MIN_MAP_ALLOC;
985 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
986 GFP_KERNEL,
987 cpu_to_node(cpu));
988 if (!new_map)
989 goto error;
990 new_map->alloc_len = alloc_len;
991 for (i = 0; i < map_len; i++)
992 new_map->queues[i] = map->queues[i];
993 new_map->len = map_len;
994 }
995 new_map->queues[new_map->len++] = index;
996 } else if (!need_set && pos < map_len) {
997 /* Need to remove queue from this CPU's map */
998 if (map_len > 1)
999 new_map->queues[pos] =
1000 new_map->queues[--new_map->len];
1001 else
1002 new_map = NULL;
1003 }
1004 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
1005 }
1006
1007 /* Cleanup old maps */
1008 for_each_possible_cpu(cpu) {
1009 map = dev_maps ?
1010 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
1011 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
1012 call_rcu(&map->rcu, xps_map_release);
1013 if (new_dev_maps->cpu_map[cpu])
1014 nonempty = 1;
1015 }
1016
1017 if (nonempty)
1018 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
1019 else {
1020 kfree(new_dev_maps);
1021 rcu_assign_pointer(dev->xps_maps, NULL);
1022 }
1023
1024 if (dev_maps)
1025 call_rcu(&dev_maps->rcu, xps_dev_maps_release);
1026
1027 netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node :
1028 NUMA_NO_NODE);
1029
1030 mutex_unlock(&xps_map_mutex);
1031
1032 free_cpumask_var(mask);
1033 return len;
1034
1035 error:
1036 mutex_unlock(&xps_map_mutex);
1037
1038 if (new_dev_maps)
1039 for_each_possible_cpu(i)
1040 kfree(rcu_dereference_protected(
1041 new_dev_maps->cpu_map[i],
1042 1));
1043 kfree(new_dev_maps);
1044 free_cpumask_var(mask);
1045 return -ENOMEM;
1046 }
1047
1048 static struct netdev_queue_attribute xps_cpus_attribute =
1049 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1050
1051 static struct attribute *netdev_queue_default_attrs[] = {
1052 &xps_cpus_attribute.attr,
1053 NULL
1054 };
1055
1056 static void netdev_queue_release(struct kobject *kobj)
1057 {
1058 struct netdev_queue *queue = to_netdev_queue(kobj);
1059 struct net_device *dev = queue->dev;
1060 struct xps_dev_maps *dev_maps;
1061 struct xps_map *map;
1062 unsigned long index;
1063 int i, pos, nonempty = 0;
1064
1065 index = get_netdev_queue_index(queue);
1066
1067 mutex_lock(&xps_map_mutex);
1068 dev_maps = xmap_dereference(dev->xps_maps);
1069
1070 if (dev_maps) {
1071 for_each_possible_cpu(i) {
1072 map = xmap_dereference(dev_maps->cpu_map[i]);
1073 if (!map)
1074 continue;
1075
1076 for (pos = 0; pos < map->len; pos++)
1077 if (map->queues[pos] == index)
1078 break;
1079
1080 if (pos < map->len) {
1081 if (map->len > 1)
1082 map->queues[pos] =
1083 map->queues[--map->len];
1084 else {
1085 RCU_INIT_POINTER(dev_maps->cpu_map[i],
1086 NULL);
1087 call_rcu(&map->rcu, xps_map_release);
1088 map = NULL;
1089 }
1090 }
1091 if (map)
1092 nonempty = 1;
1093 }
1094
1095 if (!nonempty) {
1096 RCU_INIT_POINTER(dev->xps_maps, NULL);
1097 call_rcu(&dev_maps->rcu, xps_dev_maps_release);
1098 }
1099 }
1100
1101 mutex_unlock(&xps_map_mutex);
1102
1103 memset(kobj, 0, sizeof(*kobj));
1104 dev_put(queue->dev);
1105 }
1106
1107 static struct kobj_type netdev_queue_ktype = {
1108 .sysfs_ops = &netdev_queue_sysfs_ops,
1109 .release = netdev_queue_release,
1110 .default_attrs = netdev_queue_default_attrs,
1111 };
1112
1113 static int netdev_queue_add_kobject(struct net_device *net, int index)
1114 {
1115 struct netdev_queue *queue = net->_tx + index;
1116 struct kobject *kobj = &queue->kobj;
1117 int error = 0;
1118
1119 kobj->kset = net->queues_kset;
1120 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1121 "tx-%u", index);
1122 if (error) {
1123 kobject_put(kobj);
1124 return error;
1125 }
1126
1127 kobject_uevent(kobj, KOBJ_ADD);
1128 dev_hold(queue->dev);
1129
1130 return error;
1131 }
1132 #endif /* CONFIG_XPS */
1133
1134 int
1135 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1136 {
1137 #ifdef CONFIG_XPS
1138 int i;
1139 int error = 0;
1140
1141 for (i = old_num; i < new_num; i++) {
1142 error = netdev_queue_add_kobject(net, i);
1143 if (error) {
1144 new_num = old_num;
1145 break;
1146 }
1147 }
1148
1149 while (--i >= new_num)
1150 kobject_put(&net->_tx[i].kobj);
1151
1152 return error;
1153 #else
1154 return 0;
1155 #endif
1156 }
1157
1158 static int register_queue_kobjects(struct net_device *net)
1159 {
1160 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1161
1162 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1163 net->queues_kset = kset_create_and_add("queues",
1164 NULL, &net->dev.kobj);
1165 if (!net->queues_kset)
1166 return -ENOMEM;
1167 #endif
1168
1169 #ifdef CONFIG_RPS
1170 real_rx = net->real_num_rx_queues;
1171 #endif
1172 real_tx = net->real_num_tx_queues;
1173
1174 error = net_rx_queue_update_kobjects(net, 0, real_rx);
1175 if (error)
1176 goto error;
1177 rxq = real_rx;
1178
1179 error = netdev_queue_update_kobjects(net, 0, real_tx);
1180 if (error)
1181 goto error;
1182 txq = real_tx;
1183
1184 return 0;
1185
1186 error:
1187 netdev_queue_update_kobjects(net, txq, 0);
1188 net_rx_queue_update_kobjects(net, rxq, 0);
1189 return error;
1190 }
1191
1192 static void remove_queue_kobjects(struct net_device *net)
1193 {
1194 int real_rx = 0, real_tx = 0;
1195
1196 #ifdef CONFIG_RPS
1197 real_rx = net->real_num_rx_queues;
1198 #endif
1199 real_tx = net->real_num_tx_queues;
1200
1201 net_rx_queue_update_kobjects(net, real_rx, 0);
1202 netdev_queue_update_kobjects(net, real_tx, 0);
1203 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1204 kset_unregister(net->queues_kset);
1205 #endif
1206 }
1207
1208 static const void *net_current_ns(void)
1209 {
1210 return current->nsproxy->net_ns;
1211 }
1212
1213 static const void *net_initial_ns(void)
1214 {
1215 return &init_net;
1216 }
1217
1218 static const void *net_netlink_ns(struct sock *sk)
1219 {
1220 return sock_net(sk);
1221 }
1222
1223 struct kobj_ns_type_operations net_ns_type_operations = {
1224 .type = KOBJ_NS_TYPE_NET,
1225 .current_ns = net_current_ns,
1226 .netlink_ns = net_netlink_ns,
1227 .initial_ns = net_initial_ns,
1228 };
1229 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1230
1231 static void net_kobj_ns_exit(struct net *net)
1232 {
1233 kobj_ns_exit(KOBJ_NS_TYPE_NET, net);
1234 }
1235
1236 static struct pernet_operations kobj_net_ops = {
1237 .exit = net_kobj_ns_exit,
1238 };
1239
1240
1241 #ifdef CONFIG_HOTPLUG
1242 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1243 {
1244 struct net_device *dev = to_net_dev(d);
1245 int retval;
1246
1247 /* pass interface to uevent. */
1248 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1249 if (retval)
1250 goto exit;
1251
1252 /* pass ifindex to uevent.
1253 * ifindex is useful as it won't change (interface name may change)
1254 * and is what RtNetlink uses natively. */
1255 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1256
1257 exit:
1258 return retval;
1259 }
1260 #endif
1261
1262 /*
1263 * netdev_release -- destroy and free a dead device.
1264 * Called when last reference to device kobject is gone.
1265 */
1266 static void netdev_release(struct device *d)
1267 {
1268 struct net_device *dev = to_net_dev(d);
1269
1270 BUG_ON(dev->reg_state != NETREG_RELEASED);
1271
1272 kfree(dev->ifalias);
1273 kfree((char *)dev - dev->padded);
1274 }
1275
1276 static const void *net_namespace(struct device *d)
1277 {
1278 struct net_device *dev;
1279 dev = container_of(d, struct net_device, dev);
1280 return dev_net(dev);
1281 }
1282
1283 static struct class net_class = {
1284 .name = "net",
1285 .dev_release = netdev_release,
1286 #ifdef CONFIG_SYSFS
1287 .dev_attrs = net_class_attributes,
1288 #endif /* CONFIG_SYSFS */
1289 #ifdef CONFIG_HOTPLUG
1290 .dev_uevent = netdev_uevent,
1291 #endif
1292 .ns_type = &net_ns_type_operations,
1293 .namespace = net_namespace,
1294 };
1295
1296 /* Delete sysfs entries but hold kobject reference until after all
1297 * netdev references are gone.
1298 */
1299 void netdev_unregister_kobject(struct net_device * net)
1300 {
1301 struct device *dev = &(net->dev);
1302
1303 kobject_get(&dev->kobj);
1304
1305 remove_queue_kobjects(net);
1306
1307 device_del(dev);
1308 }
1309
1310 /* Create sysfs entries for network device. */
1311 int netdev_register_kobject(struct net_device *net)
1312 {
1313 struct device *dev = &(net->dev);
1314 const struct attribute_group **groups = net->sysfs_groups;
1315 int error = 0;
1316
1317 device_initialize(dev);
1318 dev->class = &net_class;
1319 dev->platform_data = net;
1320 dev->groups = groups;
1321
1322 dev_set_name(dev, "%s", net->name);
1323
1324 #ifdef CONFIG_SYSFS
1325 /* Allow for a device specific group */
1326 if (*groups)
1327 groups++;
1328
1329 *groups++ = &netstat_group;
1330 #ifdef CONFIG_WIRELESS_EXT_SYSFS
1331 if (net->ieee80211_ptr)
1332 *groups++ = &wireless_group;
1333 #ifdef CONFIG_WIRELESS_EXT
1334 else if (net->wireless_handlers)
1335 *groups++ = &wireless_group;
1336 #endif
1337 #endif
1338 #endif /* CONFIG_SYSFS */
1339
1340 error = device_add(dev);
1341 if (error)
1342 return error;
1343
1344 error = register_queue_kobjects(net);
1345 if (error) {
1346 device_del(dev);
1347 return error;
1348 }
1349
1350 return error;
1351 }
1352
1353 int netdev_class_create_file(struct class_attribute *class_attr)
1354 {
1355 return class_create_file(&net_class, class_attr);
1356 }
1357 EXPORT_SYMBOL(netdev_class_create_file);
1358
1359 void netdev_class_remove_file(struct class_attribute *class_attr)
1360 {
1361 class_remove_file(&net_class, class_attr);
1362 }
1363 EXPORT_SYMBOL(netdev_class_remove_file);
1364
1365 int netdev_kobject_init(void)
1366 {
1367 kobj_ns_type_register(&net_ns_type_operations);
1368 register_pernet_subsys(&kobj_net_ops);
1369 return class_register(&net_class);
1370 }
CRIS linux kernel tree