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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net-sysfs.c - network device class and attributes | |
3 | * | |
4 | * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org> | |
4ec93edb | 5 | * |
1da177e4 LT |
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 | ||
4fc268d2 | 12 | #include <linux/capability.h> |
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/netdevice.h> | |
15 | #include <linux/if_arp.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
608b4b95 | 17 | #include <linux/nsproxy.h> |
1da177e4 | 18 | #include <net/sock.h> |
608b4b95 | 19 | #include <net/net_namespace.h> |
1da177e4 LT |
20 | #include <linux/rtnetlink.h> |
21 | #include <linux/wireless.h> | |
fec5e652 | 22 | #include <linux/vmalloc.h> |
8f1546ca | 23 | #include <net/wext.h> |
1da177e4 | 24 | |
342709ef PE |
25 | #include "net-sysfs.h" |
26 | ||
8b41d188 | 27 | #ifdef CONFIG_SYSFS |
1da177e4 | 28 | static const char fmt_hex[] = "%#x\n"; |
d1102b59 | 29 | static const char fmt_long_hex[] = "%#lx\n"; |
1da177e4 LT |
30 | static const char fmt_dec[] = "%d\n"; |
31 | static const char fmt_ulong[] = "%lu\n"; | |
32 | ||
4ec93edb | 33 | static inline int dev_isalive(const struct net_device *dev) |
1da177e4 | 34 | { |
fe9925b5 | 35 | return dev->reg_state <= NETREG_REGISTERED; |
1da177e4 LT |
36 | } |
37 | ||
38 | /* use same locking rules as GIF* ioctl's */ | |
43cb76d9 GKH |
39 | static ssize_t netdev_show(const struct device *dev, |
40 | struct device_attribute *attr, char *buf, | |
1da177e4 LT |
41 | ssize_t (*format)(const struct net_device *, char *)) |
42 | { | |
43cb76d9 | 43 | struct net_device *net = to_net_dev(dev); |
1da177e4 LT |
44 | ssize_t ret = -EINVAL; |
45 | ||
46 | read_lock(&dev_base_lock); | |
47 | if (dev_isalive(net)) | |
48 | ret = (*format)(net, buf); | |
49 | read_unlock(&dev_base_lock); | |
50 | ||
51 | return ret; | |
52 | } | |
53 | ||
54 | /* generate a show function for simple field */ | |
55 | #define NETDEVICE_SHOW(field, format_string) \ | |
56 | static ssize_t format_##field(const struct net_device *net, char *buf) \ | |
57 | { \ | |
58 | return sprintf(buf, format_string, net->field); \ | |
59 | } \ | |
43cb76d9 GKH |
60 | static ssize_t show_##field(struct device *dev, \ |
61 | struct device_attribute *attr, char *buf) \ | |
1da177e4 | 62 | { \ |
43cb76d9 | 63 | return netdev_show(dev, attr, buf, format_##field); \ |
1da177e4 LT |
64 | } |
65 | ||
66 | ||
67 | /* use same locking and permission rules as SIF* ioctl's */ | |
43cb76d9 | 68 | static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, |
1da177e4 LT |
69 | const char *buf, size_t len, |
70 | int (*set)(struct net_device *, unsigned long)) | |
71 | { | |
72 | struct net_device *net = to_net_dev(dev); | |
73 | char *endp; | |
74 | unsigned long new; | |
75 | int ret = -EINVAL; | |
76 | ||
77 | if (!capable(CAP_NET_ADMIN)) | |
78 | return -EPERM; | |
79 | ||
80 | new = simple_strtoul(buf, &endp, 0); | |
81 | if (endp == buf) | |
82 | goto err; | |
83 | ||
5a5990d3 | 84 | if (!rtnl_trylock()) |
336ca57c | 85 | return restart_syscall(); |
5a5990d3 | 86 | |
1da177e4 LT |
87 | if (dev_isalive(net)) { |
88 | if ((ret = (*set)(net, new)) == 0) | |
89 | ret = len; | |
90 | } | |
91 | rtnl_unlock(); | |
92 | err: | |
93 | return ret; | |
94 | } | |
95 | ||
9d29672c | 96 | NETDEVICE_SHOW(dev_id, fmt_hex); |
fd586bac KS |
97 | NETDEVICE_SHOW(addr_len, fmt_dec); |
98 | NETDEVICE_SHOW(iflink, fmt_dec); | |
99 | NETDEVICE_SHOW(ifindex, fmt_dec); | |
100 | NETDEVICE_SHOW(features, fmt_long_hex); | |
101 | NETDEVICE_SHOW(type, fmt_dec); | |
b00055aa | 102 | NETDEVICE_SHOW(link_mode, fmt_dec); |
1da177e4 LT |
103 | |
104 | /* use same locking rules as GIFHWADDR ioctl's */ | |
43cb76d9 GKH |
105 | static ssize_t show_address(struct device *dev, struct device_attribute *attr, |
106 | char *buf) | |
1da177e4 LT |
107 | { |
108 | struct net_device *net = to_net_dev(dev); | |
109 | ssize_t ret = -EINVAL; | |
110 | ||
111 | read_lock(&dev_base_lock); | |
112 | if (dev_isalive(net)) | |
7ffc49a6 | 113 | ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len); |
1da177e4 LT |
114 | read_unlock(&dev_base_lock); |
115 | return ret; | |
116 | } | |
117 | ||
43cb76d9 GKH |
118 | static ssize_t show_broadcast(struct device *dev, |
119 | struct device_attribute *attr, char *buf) | |
1da177e4 LT |
120 | { |
121 | struct net_device *net = to_net_dev(dev); | |
122 | if (dev_isalive(net)) | |
7ffc49a6 | 123 | return sysfs_format_mac(buf, net->broadcast, net->addr_len); |
1da177e4 LT |
124 | return -EINVAL; |
125 | } | |
126 | ||
43cb76d9 GKH |
127 | static ssize_t show_carrier(struct device *dev, |
128 | struct device_attribute *attr, char *buf) | |
1da177e4 LT |
129 | { |
130 | struct net_device *netdev = to_net_dev(dev); | |
131 | if (netif_running(netdev)) { | |
132 | return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); | |
133 | } | |
134 | return -EINVAL; | |
135 | } | |
136 | ||
d519e17e AG |
137 | static ssize_t show_speed(struct device *dev, |
138 | struct device_attribute *attr, char *buf) | |
139 | { | |
140 | struct net_device *netdev = to_net_dev(dev); | |
141 | int ret = -EINVAL; | |
142 | ||
143 | if (!rtnl_trylock()) | |
144 | return restart_syscall(); | |
145 | ||
ac5e3af9 ED |
146 | if (netif_running(netdev) && |
147 | netdev->ethtool_ops && | |
148 | netdev->ethtool_ops->get_settings) { | |
d519e17e AG |
149 | struct ethtool_cmd cmd = { ETHTOOL_GSET }; |
150 | ||
151 | if (!netdev->ethtool_ops->get_settings(netdev, &cmd)) | |
152 | ret = sprintf(buf, fmt_dec, ethtool_cmd_speed(&cmd)); | |
153 | } | |
154 | rtnl_unlock(); | |
155 | return ret; | |
156 | } | |
157 | ||
158 | static ssize_t show_duplex(struct device *dev, | |
159 | struct device_attribute *attr, char *buf) | |
160 | { | |
161 | struct net_device *netdev = to_net_dev(dev); | |
162 | int ret = -EINVAL; | |
163 | ||
164 | if (!rtnl_trylock()) | |
165 | return restart_syscall(); | |
166 | ||
ac5e3af9 ED |
167 | if (netif_running(netdev) && |
168 | netdev->ethtool_ops && | |
169 | netdev->ethtool_ops->get_settings) { | |
d519e17e AG |
170 | struct ethtool_cmd cmd = { ETHTOOL_GSET }; |
171 | ||
172 | if (!netdev->ethtool_ops->get_settings(netdev, &cmd)) | |
173 | ret = sprintf(buf, "%s\n", cmd.duplex ? "full" : "half"); | |
174 | } | |
175 | rtnl_unlock(); | |
176 | return ret; | |
177 | } | |
178 | ||
43cb76d9 GKH |
179 | static ssize_t show_dormant(struct device *dev, |
180 | struct device_attribute *attr, char *buf) | |
b00055aa SR |
181 | { |
182 | struct net_device *netdev = to_net_dev(dev); | |
183 | ||
184 | if (netif_running(netdev)) | |
185 | return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); | |
186 | ||
187 | return -EINVAL; | |
188 | } | |
189 | ||
36cbd3dc | 190 | static const char *const operstates[] = { |
b00055aa SR |
191 | "unknown", |
192 | "notpresent", /* currently unused */ | |
193 | "down", | |
194 | "lowerlayerdown", | |
195 | "testing", /* currently unused */ | |
196 | "dormant", | |
197 | "up" | |
198 | }; | |
199 | ||
43cb76d9 GKH |
200 | static ssize_t show_operstate(struct device *dev, |
201 | struct device_attribute *attr, char *buf) | |
b00055aa SR |
202 | { |
203 | const struct net_device *netdev = to_net_dev(dev); | |
204 | unsigned char operstate; | |
205 | ||
206 | read_lock(&dev_base_lock); | |
207 | operstate = netdev->operstate; | |
208 | if (!netif_running(netdev)) | |
209 | operstate = IF_OPER_DOWN; | |
210 | read_unlock(&dev_base_lock); | |
211 | ||
e3a5cd9e | 212 | if (operstate >= ARRAY_SIZE(operstates)) |
b00055aa SR |
213 | return -EINVAL; /* should not happen */ |
214 | ||
215 | return sprintf(buf, "%s\n", operstates[operstate]); | |
216 | } | |
217 | ||
1da177e4 LT |
218 | /* read-write attributes */ |
219 | NETDEVICE_SHOW(mtu, fmt_dec); | |
220 | ||
221 | static int change_mtu(struct net_device *net, unsigned long new_mtu) | |
222 | { | |
223 | return dev_set_mtu(net, (int) new_mtu); | |
224 | } | |
225 | ||
43cb76d9 GKH |
226 | static ssize_t store_mtu(struct device *dev, struct device_attribute *attr, |
227 | const char *buf, size_t len) | |
1da177e4 | 228 | { |
43cb76d9 | 229 | return netdev_store(dev, attr, buf, len, change_mtu); |
1da177e4 LT |
230 | } |
231 | ||
1da177e4 LT |
232 | NETDEVICE_SHOW(flags, fmt_hex); |
233 | ||
234 | static int change_flags(struct net_device *net, unsigned long new_flags) | |
235 | { | |
236 | return dev_change_flags(net, (unsigned) new_flags); | |
237 | } | |
238 | ||
43cb76d9 GKH |
239 | static ssize_t store_flags(struct device *dev, struct device_attribute *attr, |
240 | const char *buf, size_t len) | |
1da177e4 | 241 | { |
43cb76d9 | 242 | return netdev_store(dev, attr, buf, len, change_flags); |
1da177e4 LT |
243 | } |
244 | ||
1da177e4 LT |
245 | NETDEVICE_SHOW(tx_queue_len, fmt_ulong); |
246 | ||
247 | static int change_tx_queue_len(struct net_device *net, unsigned long new_len) | |
248 | { | |
249 | net->tx_queue_len = new_len; | |
250 | return 0; | |
251 | } | |
252 | ||
43cb76d9 GKH |
253 | static ssize_t store_tx_queue_len(struct device *dev, |
254 | struct device_attribute *attr, | |
255 | const char *buf, size_t len) | |
1da177e4 | 256 | { |
43cb76d9 | 257 | return netdev_store(dev, attr, buf, len, change_tx_queue_len); |
1da177e4 LT |
258 | } |
259 | ||
0b815a1a SH |
260 | static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr, |
261 | const char *buf, size_t len) | |
262 | { | |
263 | struct net_device *netdev = to_net_dev(dev); | |
264 | size_t count = len; | |
265 | ssize_t ret; | |
266 | ||
267 | if (!capable(CAP_NET_ADMIN)) | |
268 | return -EPERM; | |
269 | ||
270 | /* ignore trailing newline */ | |
271 | if (len > 0 && buf[len - 1] == '\n') | |
272 | --count; | |
273 | ||
336ca57c EB |
274 | if (!rtnl_trylock()) |
275 | return restart_syscall(); | |
0b815a1a SH |
276 | ret = dev_set_alias(netdev, buf, count); |
277 | rtnl_unlock(); | |
278 | ||
279 | return ret < 0 ? ret : len; | |
280 | } | |
281 | ||
282 | static ssize_t show_ifalias(struct device *dev, | |
283 | struct device_attribute *attr, char *buf) | |
284 | { | |
285 | const struct net_device *netdev = to_net_dev(dev); | |
286 | ssize_t ret = 0; | |
287 | ||
336ca57c EB |
288 | if (!rtnl_trylock()) |
289 | return restart_syscall(); | |
0b815a1a SH |
290 | if (netdev->ifalias) |
291 | ret = sprintf(buf, "%s\n", netdev->ifalias); | |
292 | rtnl_unlock(); | |
293 | return ret; | |
294 | } | |
295 | ||
43cb76d9 | 296 | static struct device_attribute net_class_attributes[] = { |
fd586bac | 297 | __ATTR(addr_len, S_IRUGO, show_addr_len, NULL), |
9d29672c | 298 | __ATTR(dev_id, S_IRUGO, show_dev_id, NULL), |
0b815a1a | 299 | __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias), |
fd586bac KS |
300 | __ATTR(iflink, S_IRUGO, show_iflink, NULL), |
301 | __ATTR(ifindex, S_IRUGO, show_ifindex, NULL), | |
302 | __ATTR(features, S_IRUGO, show_features, NULL), | |
303 | __ATTR(type, S_IRUGO, show_type, NULL), | |
b00055aa | 304 | __ATTR(link_mode, S_IRUGO, show_link_mode, NULL), |
fd586bac KS |
305 | __ATTR(address, S_IRUGO, show_address, NULL), |
306 | __ATTR(broadcast, S_IRUGO, show_broadcast, NULL), | |
307 | __ATTR(carrier, S_IRUGO, show_carrier, NULL), | |
d519e17e AG |
308 | __ATTR(speed, S_IRUGO, show_speed, NULL), |
309 | __ATTR(duplex, S_IRUGO, show_duplex, NULL), | |
b00055aa SR |
310 | __ATTR(dormant, S_IRUGO, show_dormant, NULL), |
311 | __ATTR(operstate, S_IRUGO, show_operstate, NULL), | |
fd586bac KS |
312 | __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu), |
313 | __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags), | |
314 | __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len, | |
315 | store_tx_queue_len), | |
fd586bac | 316 | {} |
1da177e4 LT |
317 | }; |
318 | ||
319 | /* Show a given an attribute in the statistics group */ | |
43cb76d9 GKH |
320 | static ssize_t netstat_show(const struct device *d, |
321 | struct device_attribute *attr, char *buf, | |
1da177e4 LT |
322 | unsigned long offset) |
323 | { | |
43cb76d9 | 324 | struct net_device *dev = to_net_dev(d); |
1da177e4 LT |
325 | ssize_t ret = -EINVAL; |
326 | ||
df1b86c5 PE |
327 | WARN_ON(offset > sizeof(struct net_device_stats) || |
328 | offset % sizeof(unsigned long) != 0); | |
1da177e4 LT |
329 | |
330 | read_lock(&dev_base_lock); | |
96e74088 | 331 | if (dev_isalive(dev)) { |
eeda3fd6 | 332 | const struct net_device_stats *stats = dev_get_stats(dev); |
1da177e4 LT |
333 | ret = sprintf(buf, fmt_ulong, |
334 | *(unsigned long *)(((u8 *) stats) + offset)); | |
96e74088 | 335 | } |
1da177e4 LT |
336 | read_unlock(&dev_base_lock); |
337 | return ret; | |
338 | } | |
339 | ||
340 | /* generate a read-only statistics attribute */ | |
341 | #define NETSTAT_ENTRY(name) \ | |
43cb76d9 GKH |
342 | static ssize_t show_##name(struct device *d, \ |
343 | struct device_attribute *attr, char *buf) \ | |
1da177e4 | 344 | { \ |
43cb76d9 | 345 | return netstat_show(d, attr, buf, \ |
1da177e4 LT |
346 | offsetof(struct net_device_stats, name)); \ |
347 | } \ | |
43cb76d9 | 348 | static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL) |
1da177e4 LT |
349 | |
350 | NETSTAT_ENTRY(rx_packets); | |
351 | NETSTAT_ENTRY(tx_packets); | |
352 | NETSTAT_ENTRY(rx_bytes); | |
353 | NETSTAT_ENTRY(tx_bytes); | |
354 | NETSTAT_ENTRY(rx_errors); | |
355 | NETSTAT_ENTRY(tx_errors); | |
356 | NETSTAT_ENTRY(rx_dropped); | |
357 | NETSTAT_ENTRY(tx_dropped); | |
358 | NETSTAT_ENTRY(multicast); | |
359 | NETSTAT_ENTRY(collisions); | |
360 | NETSTAT_ENTRY(rx_length_errors); | |
361 | NETSTAT_ENTRY(rx_over_errors); | |
362 | NETSTAT_ENTRY(rx_crc_errors); | |
363 | NETSTAT_ENTRY(rx_frame_errors); | |
364 | NETSTAT_ENTRY(rx_fifo_errors); | |
365 | NETSTAT_ENTRY(rx_missed_errors); | |
366 | NETSTAT_ENTRY(tx_aborted_errors); | |
367 | NETSTAT_ENTRY(tx_carrier_errors); | |
368 | NETSTAT_ENTRY(tx_fifo_errors); | |
369 | NETSTAT_ENTRY(tx_heartbeat_errors); | |
370 | NETSTAT_ENTRY(tx_window_errors); | |
371 | NETSTAT_ENTRY(rx_compressed); | |
372 | NETSTAT_ENTRY(tx_compressed); | |
373 | ||
374 | static struct attribute *netstat_attrs[] = { | |
43cb76d9 GKH |
375 | &dev_attr_rx_packets.attr, |
376 | &dev_attr_tx_packets.attr, | |
377 | &dev_attr_rx_bytes.attr, | |
378 | &dev_attr_tx_bytes.attr, | |
379 | &dev_attr_rx_errors.attr, | |
380 | &dev_attr_tx_errors.attr, | |
381 | &dev_attr_rx_dropped.attr, | |
382 | &dev_attr_tx_dropped.attr, | |
383 | &dev_attr_multicast.attr, | |
384 | &dev_attr_collisions.attr, | |
385 | &dev_attr_rx_length_errors.attr, | |
386 | &dev_attr_rx_over_errors.attr, | |
387 | &dev_attr_rx_crc_errors.attr, | |
388 | &dev_attr_rx_frame_errors.attr, | |
389 | &dev_attr_rx_fifo_errors.attr, | |
390 | &dev_attr_rx_missed_errors.attr, | |
391 | &dev_attr_tx_aborted_errors.attr, | |
392 | &dev_attr_tx_carrier_errors.attr, | |
393 | &dev_attr_tx_fifo_errors.attr, | |
394 | &dev_attr_tx_heartbeat_errors.attr, | |
395 | &dev_attr_tx_window_errors.attr, | |
396 | &dev_attr_rx_compressed.attr, | |
397 | &dev_attr_tx_compressed.attr, | |
1da177e4 LT |
398 | NULL |
399 | }; | |
400 | ||
401 | ||
402 | static struct attribute_group netstat_group = { | |
403 | .name = "statistics", | |
404 | .attrs = netstat_attrs, | |
405 | }; | |
406 | ||
22bb1be4 | 407 | #ifdef CONFIG_WIRELESS_EXT_SYSFS |
1da177e4 | 408 | /* helper function that does all the locking etc for wireless stats */ |
43cb76d9 | 409 | static ssize_t wireless_show(struct device *d, char *buf, |
1da177e4 LT |
410 | ssize_t (*format)(const struct iw_statistics *, |
411 | char *)) | |
412 | { | |
43cb76d9 | 413 | struct net_device *dev = to_net_dev(d); |
8f1546ca | 414 | const struct iw_statistics *iw; |
1da177e4 | 415 | ssize_t ret = -EINVAL; |
4ec93edb | 416 | |
b8afe641 EB |
417 | if (!rtnl_trylock()) |
418 | return restart_syscall(); | |
6dd214b5 | 419 | if (dev_isalive(dev)) { |
8f1546ca JB |
420 | iw = get_wireless_stats(dev); |
421 | if (iw) | |
6dd214b5 AB |
422 | ret = (*format)(iw, buf); |
423 | } | |
a160ee69 | 424 | rtnl_unlock(); |
1da177e4 LT |
425 | |
426 | return ret; | |
427 | } | |
428 | ||
429 | /* show function template for wireless fields */ | |
430 | #define WIRELESS_SHOW(name, field, format_string) \ | |
431 | static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \ | |
432 | { \ | |
433 | return sprintf(buf, format_string, iw->field); \ | |
434 | } \ | |
43cb76d9 GKH |
435 | static ssize_t show_iw_##name(struct device *d, \ |
436 | struct device_attribute *attr, char *buf) \ | |
1da177e4 | 437 | { \ |
43cb76d9 | 438 | return wireless_show(d, buf, format_iw_##name); \ |
1da177e4 | 439 | } \ |
43cb76d9 | 440 | static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL) |
1da177e4 LT |
441 | |
442 | WIRELESS_SHOW(status, status, fmt_hex); | |
443 | WIRELESS_SHOW(link, qual.qual, fmt_dec); | |
444 | WIRELESS_SHOW(level, qual.level, fmt_dec); | |
445 | WIRELESS_SHOW(noise, qual.noise, fmt_dec); | |
446 | WIRELESS_SHOW(nwid, discard.nwid, fmt_dec); | |
447 | WIRELESS_SHOW(crypt, discard.code, fmt_dec); | |
448 | WIRELESS_SHOW(fragment, discard.fragment, fmt_dec); | |
449 | WIRELESS_SHOW(misc, discard.misc, fmt_dec); | |
450 | WIRELESS_SHOW(retries, discard.retries, fmt_dec); | |
451 | WIRELESS_SHOW(beacon, miss.beacon, fmt_dec); | |
452 | ||
453 | static struct attribute *wireless_attrs[] = { | |
43cb76d9 GKH |
454 | &dev_attr_status.attr, |
455 | &dev_attr_link.attr, | |
456 | &dev_attr_level.attr, | |
457 | &dev_attr_noise.attr, | |
458 | &dev_attr_nwid.attr, | |
459 | &dev_attr_crypt.attr, | |
460 | &dev_attr_fragment.attr, | |
461 | &dev_attr_retries.attr, | |
462 | &dev_attr_misc.attr, | |
463 | &dev_attr_beacon.attr, | |
1da177e4 LT |
464 | NULL |
465 | }; | |
466 | ||
467 | static struct attribute_group wireless_group = { | |
468 | .name = "wireless", | |
469 | .attrs = wireless_attrs, | |
470 | }; | |
471 | #endif | |
472 | ||
30bde1f5 | 473 | #ifdef CONFIG_RPS |
0a9627f2 TH |
474 | /* |
475 | * RX queue sysfs structures and functions. | |
476 | */ | |
477 | struct rx_queue_attribute { | |
478 | struct attribute attr; | |
479 | ssize_t (*show)(struct netdev_rx_queue *queue, | |
480 | struct rx_queue_attribute *attr, char *buf); | |
481 | ssize_t (*store)(struct netdev_rx_queue *queue, | |
482 | struct rx_queue_attribute *attr, const char *buf, size_t len); | |
483 | }; | |
484 | #define to_rx_queue_attr(_attr) container_of(_attr, \ | |
485 | struct rx_queue_attribute, attr) | |
486 | ||
487 | #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) | |
488 | ||
489 | static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, | |
490 | char *buf) | |
491 | { | |
492 | struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); | |
493 | struct netdev_rx_queue *queue = to_rx_queue(kobj); | |
494 | ||
495 | if (!attribute->show) | |
496 | return -EIO; | |
497 | ||
498 | return attribute->show(queue, attribute, buf); | |
499 | } | |
500 | ||
501 | static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, | |
502 | const char *buf, size_t count) | |
503 | { | |
504 | struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); | |
505 | struct netdev_rx_queue *queue = to_rx_queue(kobj); | |
506 | ||
507 | if (!attribute->store) | |
508 | return -EIO; | |
509 | ||
510 | return attribute->store(queue, attribute, buf, count); | |
511 | } | |
512 | ||
513 | static struct sysfs_ops rx_queue_sysfs_ops = { | |
514 | .show = rx_queue_attr_show, | |
515 | .store = rx_queue_attr_store, | |
516 | }; | |
517 | ||
518 | static ssize_t show_rps_map(struct netdev_rx_queue *queue, | |
519 | struct rx_queue_attribute *attribute, char *buf) | |
520 | { | |
521 | struct rps_map *map; | |
522 | cpumask_var_t mask; | |
523 | size_t len = 0; | |
524 | int i; | |
525 | ||
526 | if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) | |
527 | return -ENOMEM; | |
528 | ||
529 | rcu_read_lock(); | |
530 | map = rcu_dereference(queue->rps_map); | |
531 | if (map) | |
532 | for (i = 0; i < map->len; i++) | |
533 | cpumask_set_cpu(map->cpus[i], mask); | |
534 | ||
535 | len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask); | |
536 | if (PAGE_SIZE - len < 3) { | |
537 | rcu_read_unlock(); | |
538 | free_cpumask_var(mask); | |
539 | return -EINVAL; | |
540 | } | |
541 | rcu_read_unlock(); | |
542 | ||
543 | free_cpumask_var(mask); | |
544 | len += sprintf(buf + len, "\n"); | |
545 | return len; | |
546 | } | |
547 | ||
548 | static void rps_map_release(struct rcu_head *rcu) | |
549 | { | |
550 | struct rps_map *map = container_of(rcu, struct rps_map, rcu); | |
551 | ||
552 | kfree(map); | |
553 | } | |
554 | ||
f5acb907 | 555 | static ssize_t store_rps_map(struct netdev_rx_queue *queue, |
0a9627f2 TH |
556 | struct rx_queue_attribute *attribute, |
557 | const char *buf, size_t len) | |
558 | { | |
559 | struct rps_map *old_map, *map; | |
560 | cpumask_var_t mask; | |
561 | int err, cpu, i; | |
562 | static DEFINE_SPINLOCK(rps_map_lock); | |
563 | ||
564 | if (!capable(CAP_NET_ADMIN)) | |
565 | return -EPERM; | |
566 | ||
567 | if (!alloc_cpumask_var(&mask, GFP_KERNEL)) | |
568 | return -ENOMEM; | |
569 | ||
570 | err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); | |
571 | if (err) { | |
572 | free_cpumask_var(mask); | |
573 | return err; | |
574 | } | |
575 | ||
576 | map = kzalloc(max_t(unsigned, | |
577 | RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), | |
578 | GFP_KERNEL); | |
579 | if (!map) { | |
580 | free_cpumask_var(mask); | |
581 | return -ENOMEM; | |
582 | } | |
583 | ||
584 | i = 0; | |
585 | for_each_cpu_and(cpu, mask, cpu_online_mask) | |
586 | map->cpus[i++] = cpu; | |
587 | ||
588 | if (i) | |
589 | map->len = i; | |
590 | else { | |
591 | kfree(map); | |
592 | map = NULL; | |
593 | } | |
594 | ||
595 | spin_lock(&rps_map_lock); | |
596 | old_map = queue->rps_map; | |
597 | rcu_assign_pointer(queue->rps_map, map); | |
598 | spin_unlock(&rps_map_lock); | |
599 | ||
600 | if (old_map) | |
601 | call_rcu(&old_map->rcu, rps_map_release); | |
602 | ||
603 | free_cpumask_var(mask); | |
604 | return len; | |
605 | } | |
606 | ||
fec5e652 TH |
607 | static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, |
608 | struct rx_queue_attribute *attr, | |
609 | char *buf) | |
610 | { | |
611 | struct rps_dev_flow_table *flow_table; | |
612 | unsigned int val = 0; | |
613 | ||
614 | rcu_read_lock(); | |
615 | flow_table = rcu_dereference(queue->rps_flow_table); | |
616 | if (flow_table) | |
617 | val = flow_table->mask + 1; | |
618 | rcu_read_unlock(); | |
619 | ||
620 | return sprintf(buf, "%u\n", val); | |
621 | } | |
622 | ||
623 | static void rps_dev_flow_table_release_work(struct work_struct *work) | |
624 | { | |
625 | struct rps_dev_flow_table *table = container_of(work, | |
626 | struct rps_dev_flow_table, free_work); | |
627 | ||
628 | vfree(table); | |
629 | } | |
630 | ||
631 | static void rps_dev_flow_table_release(struct rcu_head *rcu) | |
632 | { | |
633 | struct rps_dev_flow_table *table = container_of(rcu, | |
634 | struct rps_dev_flow_table, rcu); | |
635 | ||
636 | INIT_WORK(&table->free_work, rps_dev_flow_table_release_work); | |
637 | schedule_work(&table->free_work); | |
638 | } | |
639 | ||
f5acb907 | 640 | static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, |
fec5e652 TH |
641 | struct rx_queue_attribute *attr, |
642 | const char *buf, size_t len) | |
643 | { | |
644 | unsigned int count; | |
645 | char *endp; | |
646 | struct rps_dev_flow_table *table, *old_table; | |
647 | static DEFINE_SPINLOCK(rps_dev_flow_lock); | |
648 | ||
649 | if (!capable(CAP_NET_ADMIN)) | |
650 | return -EPERM; | |
651 | ||
652 | count = simple_strtoul(buf, &endp, 0); | |
653 | if (endp == buf) | |
654 | return -EINVAL; | |
655 | ||
656 | if (count) { | |
657 | int i; | |
658 | ||
659 | if (count > 1<<30) { | |
660 | /* Enforce a limit to prevent overflow */ | |
661 | return -EINVAL; | |
662 | } | |
663 | count = roundup_pow_of_two(count); | |
664 | table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count)); | |
665 | if (!table) | |
666 | return -ENOMEM; | |
667 | ||
668 | table->mask = count - 1; | |
669 | for (i = 0; i < count; i++) | |
670 | table->flows[i].cpu = RPS_NO_CPU; | |
671 | } else | |
672 | table = NULL; | |
673 | ||
674 | spin_lock(&rps_dev_flow_lock); | |
675 | old_table = queue->rps_flow_table; | |
676 | rcu_assign_pointer(queue->rps_flow_table, table); | |
677 | spin_unlock(&rps_dev_flow_lock); | |
678 | ||
679 | if (old_table) | |
680 | call_rcu(&old_table->rcu, rps_dev_flow_table_release); | |
681 | ||
682 | return len; | |
683 | } | |
684 | ||
0a9627f2 TH |
685 | static struct rx_queue_attribute rps_cpus_attribute = |
686 | __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); | |
687 | ||
fec5e652 TH |
688 | |
689 | static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = | |
690 | __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, | |
691 | show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); | |
692 | ||
0a9627f2 TH |
693 | static struct attribute *rx_queue_default_attrs[] = { |
694 | &rps_cpus_attribute.attr, | |
fec5e652 | 695 | &rps_dev_flow_table_cnt_attribute.attr, |
0a9627f2 TH |
696 | NULL |
697 | }; | |
698 | ||
699 | static void rx_queue_release(struct kobject *kobj) | |
700 | { | |
701 | struct netdev_rx_queue *queue = to_rx_queue(kobj); | |
0a9627f2 TH |
702 | struct netdev_rx_queue *first = queue->first; |
703 | ||
fec5e652 TH |
704 | if (queue->rps_map) |
705 | call_rcu(&queue->rps_map->rcu, rps_map_release); | |
706 | ||
707 | if (queue->rps_flow_table) | |
708 | call_rcu(&queue->rps_flow_table->rcu, | |
709 | rps_dev_flow_table_release); | |
0a9627f2 TH |
710 | |
711 | if (atomic_dec_and_test(&first->count)) | |
712 | kfree(first); | |
713 | } | |
714 | ||
715 | static struct kobj_type rx_queue_ktype = { | |
716 | .sysfs_ops = &rx_queue_sysfs_ops, | |
717 | .release = rx_queue_release, | |
718 | .default_attrs = rx_queue_default_attrs, | |
719 | }; | |
720 | ||
721 | static int rx_queue_add_kobject(struct net_device *net, int index) | |
722 | { | |
723 | struct netdev_rx_queue *queue = net->_rx + index; | |
724 | struct kobject *kobj = &queue->kobj; | |
725 | int error = 0; | |
726 | ||
727 | kobj->kset = net->queues_kset; | |
728 | error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, | |
729 | "rx-%u", index); | |
730 | if (error) { | |
731 | kobject_put(kobj); | |
732 | return error; | |
733 | } | |
734 | ||
735 | kobject_uevent(kobj, KOBJ_ADD); | |
736 | ||
737 | return error; | |
738 | } | |
739 | ||
740 | static int rx_queue_register_kobjects(struct net_device *net) | |
741 | { | |
742 | int i; | |
743 | int error = 0; | |
744 | ||
745 | net->queues_kset = kset_create_and_add("queues", | |
746 | NULL, &net->dev.kobj); | |
747 | if (!net->queues_kset) | |
748 | return -ENOMEM; | |
749 | for (i = 0; i < net->num_rx_queues; i++) { | |
750 | error = rx_queue_add_kobject(net, i); | |
751 | if (error) | |
752 | break; | |
753 | } | |
754 | ||
755 | if (error) | |
756 | while (--i >= 0) | |
757 | kobject_put(&net->_rx[i].kobj); | |
758 | ||
759 | return error; | |
760 | } | |
761 | ||
762 | static void rx_queue_remove_kobjects(struct net_device *net) | |
763 | { | |
764 | int i; | |
765 | ||
766 | for (i = 0; i < net->num_rx_queues; i++) | |
767 | kobject_put(&net->_rx[i].kobj); | |
768 | kset_unregister(net->queues_kset); | |
769 | } | |
30bde1f5 | 770 | #endif /* CONFIG_RPS */ |
608b4b95 EB |
771 | |
772 | static const void *net_current_ns(void) | |
773 | { | |
774 | return current->nsproxy->net_ns; | |
775 | } | |
776 | ||
777 | static const void *net_initial_ns(void) | |
778 | { | |
779 | return &init_net; | |
780 | } | |
781 | ||
782 | static const void *net_netlink_ns(struct sock *sk) | |
783 | { | |
784 | return sock_net(sk); | |
785 | } | |
786 | ||
787 | static struct kobj_ns_type_operations net_ns_type_operations = { | |
788 | .type = KOBJ_NS_TYPE_NET, | |
789 | .current_ns = net_current_ns, | |
790 | .netlink_ns = net_netlink_ns, | |
791 | .initial_ns = net_initial_ns, | |
792 | }; | |
793 | ||
794 | static void net_kobj_ns_exit(struct net *net) | |
795 | { | |
796 | kobj_ns_exit(KOBJ_NS_TYPE_NET, net); | |
797 | } | |
798 | ||
799 | static struct pernet_operations sysfs_net_ops = { | |
800 | .exit = net_kobj_ns_exit, | |
801 | }; | |
802 | ||
8b41d188 EB |
803 | #endif /* CONFIG_SYSFS */ |
804 | ||
1da177e4 | 805 | #ifdef CONFIG_HOTPLUG |
7eff2e7a | 806 | static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) |
1da177e4 | 807 | { |
43cb76d9 | 808 | struct net_device *dev = to_net_dev(d); |
7eff2e7a | 809 | int retval; |
1da177e4 | 810 | |
09bb5217 DL |
811 | if (!net_eq(dev_net(dev), &init_net)) |
812 | return 0; | |
813 | ||
312c004d | 814 | /* pass interface to uevent. */ |
7eff2e7a | 815 | retval = add_uevent_var(env, "INTERFACE=%s", dev->name); |
bf62456e ER |
816 | if (retval) |
817 | goto exit; | |
ca2f37db JT |
818 | |
819 | /* pass ifindex to uevent. | |
820 | * ifindex is useful as it won't change (interface name may change) | |
821 | * and is what RtNetlink uses natively. */ | |
7eff2e7a | 822 | retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); |
1da177e4 | 823 | |
bf62456e | 824 | exit: |
bf62456e | 825 | return retval; |
1da177e4 LT |
826 | } |
827 | #endif | |
828 | ||
829 | /* | |
4ec93edb | 830 | * netdev_release -- destroy and free a dead device. |
43cb76d9 | 831 | * Called when last reference to device kobject is gone. |
1da177e4 | 832 | */ |
43cb76d9 | 833 | static void netdev_release(struct device *d) |
1da177e4 | 834 | { |
43cb76d9 | 835 | struct net_device *dev = to_net_dev(d); |
1da177e4 LT |
836 | |
837 | BUG_ON(dev->reg_state != NETREG_RELEASED); | |
838 | ||
0b815a1a | 839 | kfree(dev->ifalias); |
1da177e4 LT |
840 | kfree((char *)dev - dev->padded); |
841 | } | |
842 | ||
608b4b95 EB |
843 | static const void *net_namespace(struct device *d) |
844 | { | |
845 | struct net_device *dev; | |
846 | dev = container_of(d, struct net_device, dev); | |
847 | return dev_net(dev); | |
848 | } | |
849 | ||
1da177e4 LT |
850 | static struct class net_class = { |
851 | .name = "net", | |
43cb76d9 | 852 | .dev_release = netdev_release, |
8b41d188 | 853 | #ifdef CONFIG_SYSFS |
43cb76d9 | 854 | .dev_attrs = net_class_attributes, |
8b41d188 | 855 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 856 | #ifdef CONFIG_HOTPLUG |
43cb76d9 | 857 | .dev_uevent = netdev_uevent, |
1da177e4 | 858 | #endif |
608b4b95 EB |
859 | .ns_type = &net_ns_type_operations, |
860 | .namespace = net_namespace, | |
1da177e4 LT |
861 | }; |
862 | ||
9093bbb2 SH |
863 | /* Delete sysfs entries but hold kobject reference until after all |
864 | * netdev references are gone. | |
865 | */ | |
8b41d188 | 866 | void netdev_unregister_kobject(struct net_device * net) |
1da177e4 | 867 | { |
9093bbb2 SH |
868 | struct device *dev = &(net->dev); |
869 | ||
870 | kobject_get(&dev->kobj); | |
3891845e | 871 | |
09ad9bc7 | 872 | if (!net_eq(dev_net(net), &init_net)) |
3891845e EB |
873 | return; |
874 | ||
30bde1f5 | 875 | #ifdef CONFIG_RPS |
0a9627f2 | 876 | rx_queue_remove_kobjects(net); |
e880eb6c | 877 | #endif |
0a9627f2 | 878 | |
9093bbb2 | 879 | device_del(dev); |
1da177e4 LT |
880 | } |
881 | ||
882 | /* Create sysfs entries for network device. */ | |
8b41d188 | 883 | int netdev_register_kobject(struct net_device *net) |
1da177e4 | 884 | { |
43cb76d9 | 885 | struct device *dev = &(net->dev); |
a4dbd674 | 886 | const struct attribute_group **groups = net->sysfs_groups; |
0a9627f2 | 887 | int error = 0; |
1da177e4 | 888 | |
43cb76d9 GKH |
889 | dev->class = &net_class; |
890 | dev->platform_data = net; | |
891 | dev->groups = groups; | |
1da177e4 | 892 | |
a2205472 | 893 | dev_set_name(dev, "%s", net->name); |
1da177e4 | 894 | |
8b41d188 | 895 | #ifdef CONFIG_SYSFS |
0c509a6c EB |
896 | /* Allow for a device specific group */ |
897 | if (*groups) | |
898 | groups++; | |
1da177e4 | 899 | |
0c509a6c | 900 | *groups++ = &netstat_group; |
22bb1be4 | 901 | #ifdef CONFIG_WIRELESS_EXT_SYSFS |
3d23e349 | 902 | if (net->ieee80211_ptr) |
fe9925b5 | 903 | *groups++ = &wireless_group; |
3d23e349 JB |
904 | #ifdef CONFIG_WIRELESS_EXT |
905 | else if (net->wireless_handlers) | |
906 | *groups++ = &wireless_group; | |
907 | #endif | |
1da177e4 | 908 | #endif |
8b41d188 | 909 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 910 | |
09ad9bc7 | 911 | if (!net_eq(dev_net(net), &init_net)) |
3891845e EB |
912 | return 0; |
913 | ||
0a9627f2 TH |
914 | error = device_add(dev); |
915 | if (error) | |
916 | return error; | |
917 | ||
30bde1f5 | 918 | #ifdef CONFIG_RPS |
0a9627f2 TH |
919 | error = rx_queue_register_kobjects(net); |
920 | if (error) { | |
921 | device_del(dev); | |
922 | return error; | |
923 | } | |
e880eb6c | 924 | #endif |
0a9627f2 TH |
925 | |
926 | return error; | |
1da177e4 LT |
927 | } |
928 | ||
b8a9787e JV |
929 | int netdev_class_create_file(struct class_attribute *class_attr) |
930 | { | |
931 | return class_create_file(&net_class, class_attr); | |
932 | } | |
933 | ||
934 | void netdev_class_remove_file(struct class_attribute *class_attr) | |
935 | { | |
936 | class_remove_file(&net_class, class_attr); | |
937 | } | |
938 | ||
939 | EXPORT_SYMBOL(netdev_class_create_file); | |
940 | EXPORT_SYMBOL(netdev_class_remove_file); | |
941 | ||
aaf8cdc3 DL |
942 | void netdev_initialize_kobject(struct net_device *net) |
943 | { | |
944 | struct device *device = &(net->dev); | |
945 | device_initialize(device); | |
946 | } | |
947 | ||
8b41d188 | 948 | int netdev_kobject_init(void) |
1da177e4 | 949 | { |
608b4b95 EB |
950 | kobj_ns_type_register(&net_ns_type_operations); |
951 | #ifdef CONFIG_SYSFS | |
952 | register_pernet_subsys(&sysfs_net_ops); | |
953 | #endif | |
1da177e4 LT |
954 | return class_register(&net_class); |
955 | } |