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