]>
Commit | Line | Data |
---|---|---|
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_len, fmt_dec); | |
99 | NETDEVICE_SHOW(iflink, fmt_dec); | |
100 | NETDEVICE_SHOW(ifindex, fmt_dec); | |
101 | NETDEVICE_SHOW(features, fmt_long_hex); | |
102 | NETDEVICE_SHOW(type, fmt_dec); | |
103 | NETDEVICE_SHOW(link_mode, fmt_dec); | |
104 | ||
105 | /* use same locking rules as GIFHWADDR ioctl's */ | |
106 | static ssize_t show_address(struct device *dev, struct device_attribute *attr, | |
107 | char *buf) | |
108 | { | |
109 | struct net_device *net = to_net_dev(dev); | |
110 | ssize_t ret = -EINVAL; | |
111 | ||
112 | read_lock(&dev_base_lock); | |
113 | if (dev_isalive(net)) | |
114 | ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len); | |
115 | read_unlock(&dev_base_lock); | |
116 | return ret; | |
117 | } | |
118 | ||
119 | static ssize_t show_broadcast(struct device *dev, | |
120 | struct device_attribute *attr, char *buf) | |
121 | { | |
122 | struct net_device *net = to_net_dev(dev); | |
123 | if (dev_isalive(net)) | |
124 | return sysfs_format_mac(buf, net->broadcast, net->addr_len); | |
125 | return -EINVAL; | |
126 | } | |
127 | ||
128 | static ssize_t show_carrier(struct device *dev, | |
129 | struct device_attribute *attr, char *buf) | |
130 | { | |
131 | struct net_device *netdev = to_net_dev(dev); | |
132 | if (netif_running(netdev)) { | |
133 | return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); | |
134 | } | |
135 | return -EINVAL; | |
136 | } | |
137 | ||
138 | static ssize_t show_speed(struct device *dev, | |
139 | struct device_attribute *attr, char *buf) | |
140 | { | |
141 | struct net_device *netdev = to_net_dev(dev); | |
142 | int ret = -EINVAL; | |
143 | ||
144 | if (!rtnl_trylock()) | |
145 | return restart_syscall(); | |
146 | ||
147 | if (netif_running(netdev) && | |
148 | netdev->ethtool_ops && | |
149 | netdev->ethtool_ops->get_settings) { | |
150 | struct ethtool_cmd cmd = { ETHTOOL_GSET }; | |
151 | ||
152 | if (!netdev->ethtool_ops->get_settings(netdev, &cmd)) | |
153 | ret = sprintf(buf, fmt_dec, ethtool_cmd_speed(&cmd)); | |
154 | } | |
155 | rtnl_unlock(); | |
156 | return ret; | |
157 | } | |
158 | ||
159 | static ssize_t show_duplex(struct device *dev, | |
160 | struct device_attribute *attr, char *buf) | |
161 | { | |
162 | struct net_device *netdev = to_net_dev(dev); | |
163 | int ret = -EINVAL; | |
164 | ||
165 | if (!rtnl_trylock()) | |
166 | return restart_syscall(); | |
167 | ||
168 | if (netif_running(netdev) && | |
169 | netdev->ethtool_ops && | |
170 | netdev->ethtool_ops->get_settings) { | |
171 | struct ethtool_cmd cmd = { ETHTOOL_GSET }; | |
172 | ||
173 | if (!netdev->ethtool_ops->get_settings(netdev, &cmd)) | |
174 | ret = sprintf(buf, "%s\n", cmd.duplex ? "full" : "half"); | |
175 | } | |
176 | rtnl_unlock(); | |
177 | return ret; | |
178 | } | |
179 | ||
180 | static ssize_t show_dormant(struct device *dev, | |
181 | struct device_attribute *attr, char *buf) | |
182 | { | |
183 | struct net_device *netdev = to_net_dev(dev); | |
184 | ||
185 | if (netif_running(netdev)) | |
186 | return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); | |
187 | ||
188 | return -EINVAL; | |
189 | } | |
190 | ||
191 | static const char *const operstates[] = { | |
192 | "unknown", | |
193 | "notpresent", /* currently unused */ | |
194 | "down", | |
195 | "lowerlayerdown", | |
196 | "testing", /* currently unused */ | |
197 | "dormant", | |
198 | "up" | |
199 | }; | |
200 | ||
201 | static ssize_t show_operstate(struct device *dev, | |
202 | struct device_attribute *attr, char *buf) | |
203 | { | |
204 | const struct net_device *netdev = to_net_dev(dev); | |
205 | unsigned char operstate; | |
206 | ||
207 | read_lock(&dev_base_lock); | |
208 | operstate = netdev->operstate; | |
209 | if (!netif_running(netdev)) | |
210 | operstate = IF_OPER_DOWN; | |
211 | read_unlock(&dev_base_lock); | |
212 | ||
213 | if (operstate >= ARRAY_SIZE(operstates)) | |
214 | return -EINVAL; /* should not happen */ | |
215 | ||
216 | return sprintf(buf, "%s\n", operstates[operstate]); | |
217 | } | |
218 | ||
219 | /* read-write attributes */ | |
220 | NETDEVICE_SHOW(mtu, fmt_dec); | |
221 | ||
222 | static int change_mtu(struct net_device *net, unsigned long new_mtu) | |
223 | { | |
224 | return dev_set_mtu(net, (int) new_mtu); | |
225 | } | |
226 | ||
227 | static ssize_t store_mtu(struct device *dev, struct device_attribute *attr, | |
228 | const char *buf, size_t len) | |
229 | { | |
230 | return netdev_store(dev, attr, buf, len, change_mtu); | |
231 | } | |
232 | ||
233 | NETDEVICE_SHOW(flags, fmt_hex); | |
234 | ||
235 | static int change_flags(struct net_device *net, unsigned long new_flags) | |
236 | { | |
237 | return dev_change_flags(net, (unsigned) new_flags); | |
238 | } | |
239 | ||
240 | static ssize_t store_flags(struct device *dev, struct device_attribute *attr, | |
241 | const char *buf, size_t len) | |
242 | { | |
243 | return netdev_store(dev, attr, buf, len, change_flags); | |
244 | } | |
245 | ||
246 | NETDEVICE_SHOW(tx_queue_len, fmt_ulong); | |
247 | ||
248 | static int change_tx_queue_len(struct net_device *net, unsigned long new_len) | |
249 | { | |
250 | net->tx_queue_len = new_len; | |
251 | return 0; | |
252 | } | |
253 | ||
254 | static ssize_t store_tx_queue_len(struct device *dev, | |
255 | struct device_attribute *attr, | |
256 | const char *buf, size_t len) | |
257 | { | |
258 | return netdev_store(dev, attr, buf, len, change_tx_queue_len); | |
259 | } | |
260 | ||
261 | static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr, | |
262 | const char *buf, size_t len) | |
263 | { | |
264 | struct net_device *netdev = to_net_dev(dev); | |
265 | size_t count = len; | |
266 | ssize_t ret; | |
267 | ||
268 | if (!capable(CAP_NET_ADMIN)) | |
269 | return -EPERM; | |
270 | ||
271 | /* ignore trailing newline */ | |
272 | if (len > 0 && buf[len - 1] == '\n') | |
273 | --count; | |
274 | ||
275 | if (!rtnl_trylock()) | |
276 | return restart_syscall(); | |
277 | ret = dev_set_alias(netdev, buf, count); | |
278 | rtnl_unlock(); | |
279 | ||
280 | return ret < 0 ? ret : len; | |
281 | } | |
282 | ||
283 | static ssize_t show_ifalias(struct device *dev, | |
284 | struct device_attribute *attr, char *buf) | |
285 | { | |
286 | const struct net_device *netdev = to_net_dev(dev); | |
287 | ssize_t ret = 0; | |
288 | ||
289 | if (!rtnl_trylock()) | |
290 | return restart_syscall(); | |
291 | if (netdev->ifalias) | |
292 | ret = sprintf(buf, "%s\n", netdev->ifalias); | |
293 | rtnl_unlock(); | |
294 | return ret; | |
295 | } | |
296 | ||
297 | static struct device_attribute net_class_attributes[] = { | |
298 | __ATTR(addr_len, S_IRUGO, show_addr_len, NULL), | |
299 | __ATTR(dev_id, S_IRUGO, show_dev_id, NULL), | |
300 | __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias), | |
301 | __ATTR(iflink, S_IRUGO, show_iflink, NULL), | |
302 | __ATTR(ifindex, S_IRUGO, show_ifindex, NULL), | |
303 | __ATTR(features, S_IRUGO, show_features, NULL), | |
304 | __ATTR(type, S_IRUGO, show_type, NULL), | |
305 | __ATTR(link_mode, S_IRUGO, show_link_mode, NULL), | |
306 | __ATTR(address, S_IRUGO, show_address, NULL), | |
307 | __ATTR(broadcast, S_IRUGO, show_broadcast, NULL), | |
308 | __ATTR(carrier, S_IRUGO, show_carrier, NULL), | |
309 | __ATTR(speed, S_IRUGO, show_speed, NULL), | |
310 | __ATTR(duplex, S_IRUGO, show_duplex, NULL), | |
311 | __ATTR(dormant, S_IRUGO, show_dormant, NULL), | |
312 | __ATTR(operstate, S_IRUGO, show_operstate, NULL), | |
313 | __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu), | |
314 | __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags), | |
315 | __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len, | |
316 | store_tx_queue_len), | |
317 | {} | |
318 | }; | |
319 | ||
320 | /* Show a given an attribute in the statistics group */ | |
321 | static ssize_t netstat_show(const struct device *d, | |
322 | struct device_attribute *attr, char *buf, | |
323 | unsigned long offset) | |
324 | { | |
325 | struct net_device *dev = to_net_dev(d); | |
326 | ssize_t ret = -EINVAL; | |
327 | ||
328 | WARN_ON(offset > sizeof(struct rtnl_link_stats64) || | |
329 | offset % sizeof(u64) != 0); | |
330 | ||
331 | read_lock(&dev_base_lock); | |
332 | if (dev_isalive(dev)) { | |
333 | struct rtnl_link_stats64 temp; | |
334 | const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); | |
335 | ||
336 | ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset)); | |
337 | } | |
338 | read_unlock(&dev_base_lock); | |
339 | return ret; | |
340 | } | |
341 | ||
342 | /* generate a read-only statistics attribute */ | |
343 | #define NETSTAT_ENTRY(name) \ | |
344 | static ssize_t show_##name(struct device *d, \ | |
345 | struct device_attribute *attr, char *buf) \ | |
346 | { \ | |
347 | return netstat_show(d, attr, buf, \ | |
348 | offsetof(struct rtnl_link_stats64, name)); \ | |
349 | } \ | |
350 | static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL) | |
351 | ||
352 | NETSTAT_ENTRY(rx_packets); | |
353 | NETSTAT_ENTRY(tx_packets); | |
354 | NETSTAT_ENTRY(rx_bytes); | |
355 | NETSTAT_ENTRY(tx_bytes); | |
356 | NETSTAT_ENTRY(rx_errors); | |
357 | NETSTAT_ENTRY(tx_errors); | |
358 | NETSTAT_ENTRY(rx_dropped); | |
359 | NETSTAT_ENTRY(tx_dropped); | |
360 | NETSTAT_ENTRY(multicast); | |
361 | NETSTAT_ENTRY(collisions); | |
362 | NETSTAT_ENTRY(rx_length_errors); | |
363 | NETSTAT_ENTRY(rx_over_errors); | |
364 | NETSTAT_ENTRY(rx_crc_errors); | |
365 | NETSTAT_ENTRY(rx_frame_errors); | |
366 | NETSTAT_ENTRY(rx_fifo_errors); | |
367 | NETSTAT_ENTRY(rx_missed_errors); | |
368 | NETSTAT_ENTRY(tx_aborted_errors); | |
369 | NETSTAT_ENTRY(tx_carrier_errors); | |
370 | NETSTAT_ENTRY(tx_fifo_errors); | |
371 | NETSTAT_ENTRY(tx_heartbeat_errors); | |
372 | NETSTAT_ENTRY(tx_window_errors); | |
373 | NETSTAT_ENTRY(rx_compressed); | |
374 | NETSTAT_ENTRY(tx_compressed); | |
375 | ||
376 | static struct attribute *netstat_attrs[] = { | |
377 | &dev_attr_rx_packets.attr, | |
378 | &dev_attr_tx_packets.attr, | |
379 | &dev_attr_rx_bytes.attr, | |
380 | &dev_attr_tx_bytes.attr, | |
381 | &dev_attr_rx_errors.attr, | |
382 | &dev_attr_tx_errors.attr, | |
383 | &dev_attr_rx_dropped.attr, | |
384 | &dev_attr_tx_dropped.attr, | |
385 | &dev_attr_multicast.attr, | |
386 | &dev_attr_collisions.attr, | |
387 | &dev_attr_rx_length_errors.attr, | |
388 | &dev_attr_rx_over_errors.attr, | |
389 | &dev_attr_rx_crc_errors.attr, | |
390 | &dev_attr_rx_frame_errors.attr, | |
391 | &dev_attr_rx_fifo_errors.attr, | |
392 | &dev_attr_rx_missed_errors.attr, | |
393 | &dev_attr_tx_aborted_errors.attr, | |
394 | &dev_attr_tx_carrier_errors.attr, | |
395 | &dev_attr_tx_fifo_errors.attr, | |
396 | &dev_attr_tx_heartbeat_errors.attr, | |
397 | &dev_attr_tx_window_errors.attr, | |
398 | &dev_attr_rx_compressed.attr, | |
399 | &dev_attr_tx_compressed.attr, | |
400 | NULL | |
401 | }; | |
402 | ||
403 | ||
404 | static struct attribute_group netstat_group = { | |
405 | .name = "statistics", | |
406 | .attrs = netstat_attrs, | |
407 | }; | |
408 | ||
409 | #ifdef CONFIG_WIRELESS_EXT_SYSFS | |
410 | /* helper function that does all the locking etc for wireless stats */ | |
411 | static ssize_t wireless_show(struct device *d, char *buf, | |
412 | ssize_t (*format)(const struct iw_statistics *, | |
413 | char *)) | |
414 | { | |
415 | struct net_device *dev = to_net_dev(d); | |
416 | const struct iw_statistics *iw; | |
417 | ssize_t ret = -EINVAL; | |
418 | ||
419 | if (!rtnl_trylock()) | |
420 | return restart_syscall(); | |
421 | if (dev_isalive(dev)) { | |
422 | iw = get_wireless_stats(dev); | |
423 | if (iw) | |
424 | ret = (*format)(iw, buf); | |
425 | } | |
426 | rtnl_unlock(); | |
427 | ||
428 | return ret; | |
429 | } | |
430 | ||
431 | /* show function template for wireless fields */ | |
432 | #define WIRELESS_SHOW(name, field, format_string) \ | |
433 | static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \ | |
434 | { \ | |
435 | return sprintf(buf, format_string, iw->field); \ | |
436 | } \ | |
437 | static ssize_t show_iw_##name(struct device *d, \ | |
438 | struct device_attribute *attr, char *buf) \ | |
439 | { \ | |
440 | return wireless_show(d, buf, format_iw_##name); \ | |
441 | } \ | |
442 | static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL) | |
443 | ||
444 | WIRELESS_SHOW(status, status, fmt_hex); | |
445 | WIRELESS_SHOW(link, qual.qual, fmt_dec); | |
446 | WIRELESS_SHOW(level, qual.level, fmt_dec); | |
447 | WIRELESS_SHOW(noise, qual.noise, fmt_dec); | |
448 | WIRELESS_SHOW(nwid, discard.nwid, fmt_dec); | |
449 | WIRELESS_SHOW(crypt, discard.code, fmt_dec); | |
450 | WIRELESS_SHOW(fragment, discard.fragment, fmt_dec); | |
451 | WIRELESS_SHOW(misc, discard.misc, fmt_dec); | |
452 | WIRELESS_SHOW(retries, discard.retries, fmt_dec); | |
453 | WIRELESS_SHOW(beacon, miss.beacon, fmt_dec); | |
454 | ||
455 | static struct attribute *wireless_attrs[] = { | |
456 | &dev_attr_status.attr, | |
457 | &dev_attr_link.attr, | |
458 | &dev_attr_level.attr, | |
459 | &dev_attr_noise.attr, | |
460 | &dev_attr_nwid.attr, | |
461 | &dev_attr_crypt.attr, | |
462 | &dev_attr_fragment.attr, | |
463 | &dev_attr_retries.attr, | |
464 | &dev_attr_misc.attr, | |
465 | &dev_attr_beacon.attr, | |
466 | NULL | |
467 | }; | |
468 | ||
469 | static struct attribute_group wireless_group = { | |
470 | .name = "wireless", | |
471 | .attrs = wireless_attrs, | |
472 | }; | |
473 | #endif | |
474 | #endif /* CONFIG_SYSFS */ | |
475 | ||
476 | #ifdef CONFIG_RPS | |
477 | /* | |
478 | * RX queue sysfs structures and functions. | |
479 | */ | |
480 | struct rx_queue_attribute { | |
481 | struct attribute attr; | |
482 | ssize_t (*show)(struct netdev_rx_queue *queue, | |
483 | struct rx_queue_attribute *attr, char *buf); | |
484 | ssize_t (*store)(struct netdev_rx_queue *queue, | |
485 | struct rx_queue_attribute *attr, const char *buf, size_t len); | |
486 | }; | |
487 | #define to_rx_queue_attr(_attr) container_of(_attr, \ | |
488 | struct rx_queue_attribute, attr) | |
489 | ||
490 | #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) | |
491 | ||
492 | static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, | |
493 | char *buf) | |
494 | { | |
495 | struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); | |
496 | struct netdev_rx_queue *queue = to_rx_queue(kobj); | |
497 | ||
498 | if (!attribute->show) | |
499 | return -EIO; | |
500 | ||
501 | return attribute->show(queue, attribute, buf); | |
502 | } | |
503 | ||
504 | static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, | |
505 | const char *buf, size_t count) | |
506 | { | |
507 | struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); | |
508 | struct netdev_rx_queue *queue = to_rx_queue(kobj); | |
509 | ||
510 | if (!attribute->store) | |
511 | return -EIO; | |
512 | ||
513 | return attribute->store(queue, attribute, buf, count); | |
514 | } | |
515 | ||
516 | static struct sysfs_ops rx_queue_sysfs_ops = { | |
517 | .show = rx_queue_attr_show, | |
518 | .store = rx_queue_attr_store, | |
519 | }; | |
520 | ||
521 | static ssize_t show_rps_map(struct netdev_rx_queue *queue, | |
522 | struct rx_queue_attribute *attribute, char *buf) | |
523 | { | |
524 | struct rps_map *map; | |
525 | cpumask_var_t mask; | |
526 | size_t len = 0; | |
527 | int i; | |
528 | ||
529 | if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) | |
530 | return -ENOMEM; | |
531 | ||
532 | rcu_read_lock(); | |
533 | map = rcu_dereference(queue->rps_map); | |
534 | if (map) | |
535 | for (i = 0; i < map->len; i++) | |
536 | cpumask_set_cpu(map->cpus[i], mask); | |
537 | ||
538 | len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask); | |
539 | if (PAGE_SIZE - len < 3) { | |
540 | rcu_read_unlock(); | |
541 | free_cpumask_var(mask); | |
542 | return -EINVAL; | |
543 | } | |
544 | rcu_read_unlock(); | |
545 | ||
546 | free_cpumask_var(mask); | |
547 | len += sprintf(buf + len, "\n"); | |
548 | return len; | |
549 | } | |
550 | ||
551 | static void rps_map_release(struct rcu_head *rcu) | |
552 | { | |
553 | struct rps_map *map = container_of(rcu, struct rps_map, rcu); | |
554 | ||
555 | kfree(map); | |
556 | } | |
557 | ||
558 | static ssize_t store_rps_map(struct netdev_rx_queue *queue, | |
559 | struct rx_queue_attribute *attribute, | |
560 | const char *buf, size_t len) | |
561 | { | |
562 | struct rps_map *old_map, *map; | |
563 | cpumask_var_t mask; | |
564 | int err, cpu, i; | |
565 | static DEFINE_SPINLOCK(rps_map_lock); | |
566 | ||
567 | if (!capable(CAP_NET_ADMIN)) | |
568 | return -EPERM; | |
569 | ||
570 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) | |
571 | return -ENOMEM; | |
572 | ||
573 | err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); | |
574 | if (err) { | |
575 | free_cpumask_var(mask); | |
576 | return err; | |
577 | } | |
578 | ||
579 | map = kzalloc(max_t(unsigned, | |
580 | RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), | |
581 | GFP_KERNEL); | |
582 | if (!map) { | |
583 | free_cpumask_var(mask); | |
584 | return -ENOMEM; | |
585 | } | |
586 | ||
587 | i = 0; | |
588 | for_each_cpu_and(cpu, mask, cpu_online_mask) | |
589 | map->cpus[i++] = cpu; | |
590 | ||
591 | if (i) | |
592 | map->len = i; | |
593 | else { | |
594 | kfree(map); | |
595 | map = NULL; | |
596 | } | |
597 | ||
598 | spin_lock(&rps_map_lock); | |
599 | old_map = queue->rps_map; | |
600 | rcu_assign_pointer(queue->rps_map, map); | |
601 | spin_unlock(&rps_map_lock); | |
602 | ||
603 | if (old_map) | |
604 | call_rcu(&old_map->rcu, rps_map_release); | |
605 | ||
606 | free_cpumask_var(mask); | |
607 | return len; | |
608 | } | |
609 | ||
610 | static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, | |
611 | struct rx_queue_attribute *attr, | |
612 | char *buf) | |
613 | { | |
614 | struct rps_dev_flow_table *flow_table; | |
615 | unsigned int val = 0; | |
616 | ||
617 | rcu_read_lock(); | |
618 | flow_table = rcu_dereference(queue->rps_flow_table); | |
619 | if (flow_table) | |
620 | val = flow_table->mask + 1; | |
621 | rcu_read_unlock(); | |
622 | ||
623 | return sprintf(buf, "%u\n", val); | |
624 | } | |
625 | ||
626 | static void rps_dev_flow_table_release_work(struct work_struct *work) | |
627 | { | |
628 | struct rps_dev_flow_table *table = container_of(work, | |
629 | struct rps_dev_flow_table, free_work); | |
630 | ||
631 | vfree(table); | |
632 | } | |
633 | ||
634 | static void rps_dev_flow_table_release(struct rcu_head *rcu) | |
635 | { | |
636 | struct rps_dev_flow_table *table = container_of(rcu, | |
637 | struct rps_dev_flow_table, rcu); | |
638 | ||
639 | INIT_WORK(&table->free_work, rps_dev_flow_table_release_work); | |
640 | schedule_work(&table->free_work); | |
641 | } | |
642 | ||
643 | static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, | |
644 | struct rx_queue_attribute *attr, | |
645 | const char *buf, size_t len) | |
646 | { | |
647 | unsigned int count; | |
648 | char *endp; | |
649 | struct rps_dev_flow_table *table, *old_table; | |
650 | static DEFINE_SPINLOCK(rps_dev_flow_lock); | |
651 | ||
652 | if (!capable(CAP_NET_ADMIN)) | |
653 | return -EPERM; | |
654 | ||
655 | count = simple_strtoul(buf, &endp, 0); | |
656 | if (endp == buf) | |
657 | return -EINVAL; | |
658 | ||
659 | if (count) { | |
660 | int i; | |
661 | ||
662 | if (count > 1<<30) { | |
663 | /* Enforce a limit to prevent overflow */ | |
664 | return -EINVAL; | |
665 | } | |
666 | count = roundup_pow_of_two(count); | |
667 | table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count)); | |
668 | if (!table) | |
669 | return -ENOMEM; | |
670 | ||
671 | table->mask = count - 1; | |
672 | for (i = 0; i < count; i++) | |
673 | table->flows[i].cpu = RPS_NO_CPU; | |
674 | } else | |
675 | table = NULL; | |
676 | ||
677 | spin_lock(&rps_dev_flow_lock); | |
678 | old_table = queue->rps_flow_table; | |
679 | rcu_assign_pointer(queue->rps_flow_table, table); | |
680 | spin_unlock(&rps_dev_flow_lock); | |
681 | ||
682 | if (old_table) | |
683 | call_rcu(&old_table->rcu, rps_dev_flow_table_release); | |
684 | ||
685 | return len; | |
686 | } | |
687 | ||
688 | static struct rx_queue_attribute rps_cpus_attribute = | |
689 | __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); | |
690 | ||
691 | ||
692 | static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = | |
693 | __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, | |
694 | show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); | |
695 | ||
696 | static struct attribute *rx_queue_default_attrs[] = { | |
697 | &rps_cpus_attribute.attr, | |
698 | &rps_dev_flow_table_cnt_attribute.attr, | |
699 | NULL | |
700 | }; | |
701 | ||
702 | static void rx_queue_release(struct kobject *kobj) | |
703 | { | |
704 | struct netdev_rx_queue *queue = to_rx_queue(kobj); | |
705 | struct netdev_rx_queue *first = queue->first; | |
706 | ||
707 | if (queue->rps_map) | |
708 | call_rcu(&queue->rps_map->rcu, rps_map_release); | |
709 | ||
710 | if (queue->rps_flow_table) | |
711 | call_rcu(&queue->rps_flow_table->rcu, | |
712 | rps_dev_flow_table_release); | |
713 | ||
714 | if (atomic_dec_and_test(&first->count)) | |
715 | kfree(first); | |
716 | } | |
717 | ||
718 | static struct kobj_type rx_queue_ktype = { | |
719 | .sysfs_ops = &rx_queue_sysfs_ops, | |
720 | .release = rx_queue_release, | |
721 | .default_attrs = rx_queue_default_attrs, | |
722 | }; | |
723 | ||
724 | static int rx_queue_add_kobject(struct net_device *net, int index) | |
725 | { | |
726 | struct netdev_rx_queue *queue = net->_rx + index; | |
727 | struct kobject *kobj = &queue->kobj; | |
728 | int error = 0; | |
729 | ||
730 | kobj->kset = net->queues_kset; | |
731 | error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, | |
732 | "rx-%u", index); | |
733 | if (error) { | |
734 | kobject_put(kobj); | |
735 | return error; | |
736 | } | |
737 | ||
738 | kobject_uevent(kobj, KOBJ_ADD); | |
739 | ||
740 | return error; | |
741 | } | |
742 | ||
743 | static int rx_queue_register_kobjects(struct net_device *net) | |
744 | { | |
745 | int i; | |
746 | int error = 0; | |
747 | ||
748 | net->queues_kset = kset_create_and_add("queues", | |
749 | NULL, &net->dev.kobj); | |
750 | if (!net->queues_kset) | |
751 | return -ENOMEM; | |
752 | for (i = 0; i < net->num_rx_queues; i++) { | |
753 | error = rx_queue_add_kobject(net, i); | |
754 | if (error) | |
755 | break; | |
756 | } | |
757 | ||
758 | if (error) | |
759 | while (--i >= 0) | |
760 | kobject_put(&net->_rx[i].kobj); | |
761 | ||
762 | return error; | |
763 | } | |
764 | ||
765 | static void rx_queue_remove_kobjects(struct net_device *net) | |
766 | { | |
767 | int i; | |
768 | ||
769 | for (i = 0; i < net->num_rx_queues; i++) | |
770 | kobject_put(&net->_rx[i].kobj); | |
771 | kset_unregister(net->queues_kset); | |
772 | } | |
773 | #endif /* CONFIG_RPS */ | |
774 | ||
775 | static const void *net_current_ns(void) | |
776 | { | |
777 | return current->nsproxy->net_ns; | |
778 | } | |
779 | ||
780 | static const void *net_initial_ns(void) | |
781 | { | |
782 | return &init_net; | |
783 | } | |
784 | ||
785 | static const void *net_netlink_ns(struct sock *sk) | |
786 | { | |
787 | return sock_net(sk); | |
788 | } | |
789 | ||
790 | static struct kobj_ns_type_operations net_ns_type_operations = { | |
791 | .type = KOBJ_NS_TYPE_NET, | |
792 | .current_ns = net_current_ns, | |
793 | .netlink_ns = net_netlink_ns, | |
794 | .initial_ns = net_initial_ns, | |
795 | }; | |
796 | ||
797 | static void net_kobj_ns_exit(struct net *net) | |
798 | { | |
799 | kobj_ns_exit(KOBJ_NS_TYPE_NET, net); | |
800 | } | |
801 | ||
802 | static struct pernet_operations kobj_net_ops = { | |
803 | .exit = net_kobj_ns_exit, | |
804 | }; | |
805 | ||
806 | ||
807 | #ifdef CONFIG_HOTPLUG | |
808 | static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) | |
809 | { | |
810 | struct net_device *dev = to_net_dev(d); | |
811 | int retval; | |
812 | ||
813 | /* pass interface to uevent. */ | |
814 | retval = add_uevent_var(env, "INTERFACE=%s", dev->name); | |
815 | if (retval) | |
816 | goto exit; | |
817 | ||
818 | /* pass ifindex to uevent. | |
819 | * ifindex is useful as it won't change (interface name may change) | |
820 | * and is what RtNetlink uses natively. */ | |
821 | retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); | |
822 | ||
823 | exit: | |
824 | return retval; | |
825 | } | |
826 | #endif | |
827 | ||
828 | /* | |
829 | * netdev_release -- destroy and free a dead device. | |
830 | * Called when last reference to device kobject is gone. | |
831 | */ | |
832 | static void netdev_release(struct device *d) | |
833 | { | |
834 | struct net_device *dev = to_net_dev(d); | |
835 | ||
836 | BUG_ON(dev->reg_state != NETREG_RELEASED); | |
837 | ||
838 | kfree(dev->ifalias); | |
839 | kfree((char *)dev - dev->padded); | |
840 | } | |
841 | ||
842 | static const void *net_namespace(struct device *d) | |
843 | { | |
844 | struct net_device *dev; | |
845 | dev = container_of(d, struct net_device, dev); | |
846 | return dev_net(dev); | |
847 | } | |
848 | ||
849 | static struct class net_class = { | |
850 | .name = "net", | |
851 | .dev_release = netdev_release, | |
852 | #ifdef CONFIG_SYSFS | |
853 | .dev_attrs = net_class_attributes, | |
854 | #endif /* CONFIG_SYSFS */ | |
855 | #ifdef CONFIG_HOTPLUG | |
856 | .dev_uevent = netdev_uevent, | |
857 | #endif | |
858 | .ns_type = &net_ns_type_operations, | |
859 | .namespace = net_namespace, | |
860 | }; | |
861 | ||
862 | /* Delete sysfs entries but hold kobject reference until after all | |
863 | * netdev references are gone. | |
864 | */ | |
865 | void netdev_unregister_kobject(struct net_device * net) | |
866 | { | |
867 | struct device *dev = &(net->dev); | |
868 | ||
869 | kobject_get(&dev->kobj); | |
870 | ||
871 | #ifdef CONFIG_RPS | |
872 | rx_queue_remove_kobjects(net); | |
873 | #endif | |
874 | ||
875 | device_del(dev); | |
876 | } | |
877 | ||
878 | /* Create sysfs entries for network device. */ | |
879 | int netdev_register_kobject(struct net_device *net) | |
880 | { | |
881 | struct device *dev = &(net->dev); | |
882 | const struct attribute_group **groups = net->sysfs_groups; | |
883 | int error = 0; | |
884 | ||
885 | device_initialize(dev); | |
886 | dev->class = &net_class; | |
887 | dev->platform_data = net; | |
888 | dev->groups = groups; | |
889 | ||
890 | dev_set_name(dev, "%s", net->name); | |
891 | ||
892 | #ifdef CONFIG_SYSFS | |
893 | /* Allow for a device specific group */ | |
894 | if (*groups) | |
895 | groups++; | |
896 | ||
897 | *groups++ = &netstat_group; | |
898 | #ifdef CONFIG_WIRELESS_EXT_SYSFS | |
899 | if (net->ieee80211_ptr) | |
900 | *groups++ = &wireless_group; | |
901 | #ifdef CONFIG_WIRELESS_EXT | |
902 | else if (net->wireless_handlers) | |
903 | *groups++ = &wireless_group; | |
904 | #endif | |
905 | #endif | |
906 | #endif /* CONFIG_SYSFS */ | |
907 | ||
908 | error = device_add(dev); | |
909 | if (error) | |
910 | return error; | |
911 | ||
912 | #ifdef CONFIG_RPS | |
913 | error = rx_queue_register_kobjects(net); | |
914 | if (error) { | |
915 | device_del(dev); | |
916 | return error; | |
917 | } | |
918 | #endif | |
919 | ||
920 | return error; | |
921 | } | |
922 | ||
923 | int netdev_class_create_file(struct class_attribute *class_attr) | |
924 | { | |
925 | return class_create_file(&net_class, class_attr); | |
926 | } | |
927 | ||
928 | void netdev_class_remove_file(struct class_attribute *class_attr) | |
929 | { | |
930 | class_remove_file(&net_class, class_attr); | |
931 | } | |
932 | ||
933 | EXPORT_SYMBOL(netdev_class_create_file); | |
934 | EXPORT_SYMBOL(netdev_class_remove_file); | |
935 | ||
936 | int netdev_kobject_init(void) | |
937 | { | |
938 | kobj_ns_type_register(&net_ns_type_operations); | |
939 | register_pernet_subsys(&kobj_net_ops); | |
940 | return class_register(&net_class); | |
941 | } |