1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * net-sysfs.c - network device class and attributes
4 *
5 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
6 */
7
8 #include <linux/capability.h>
9 #include <linux/kernel.h>
10 #include <linux/netdevice.h>
11 #include <linux/if_arp.h>
12 #include <linux/slab.h>
13 #include <linux/sched/signal.h>
14 #include <linux/nsproxy.h>
15 #include <net/sock.h>
16 #include <net/net_namespace.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/vmalloc.h>
19 #include <linux/export.h>
20 #include <linux/jiffies.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/of.h>
23 #include <linux/of_net.h>
24 #include <linux/cpu.h>
25
26 #include "net-sysfs.h"
27
28 #ifdef CONFIG_SYSFS
29 static const char fmt_hex[] = "%#x\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
dev_isalive(const struct net_device * dev)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 */
netdev_show(const struct device * dev,struct device_attribute * attr,char * buf,ssize_t (* format)(const struct net_device *,char *))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 *ndev = to_net_dev(dev);
45 ssize_t ret = -EINVAL;
46
47 read_lock(&dev_base_lock);
48 if (dev_isalive(ndev))
49 ret = (*format)(ndev, 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 *dev, char *buf) \
58 { \
59 return sprintf(buf, format_string, dev->field); \
60 } \
61 static ssize_t field##_show(struct device *dev, \
62 struct device_attribute *attr, char *buf) \
63 { \
64 return netdev_show(dev, attr, buf, format_##field); \
65 } \
66
67 #define NETDEVICE_SHOW_RO(field, format_string) \
68 NETDEVICE_SHOW(field, format_string); \
69 static DEVICE_ATTR_RO(field)
70
71 #define NETDEVICE_SHOW_RW(field, format_string) \
72 NETDEVICE_SHOW(field, format_string); \
73 static DEVICE_ATTR_RW(field)
74
75 /* use same locking and permission rules as SIF* ioctl's */
netdev_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len,int (* set)(struct net_device *,unsigned long))76 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
77 const char *buf, size_t len,
78 int (*set)(struct net_device *, unsigned long))
79 {
80 struct net_device *netdev = to_net_dev(dev);
81 struct net *net = dev_net(netdev);
82 unsigned long new;
83 int ret = -EINVAL;
84
85 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
86 return -EPERM;
87
88 ret = kstrtoul(buf, 0, &new);
89 if (ret)
90 goto err;
91
92 if (!rtnl_trylock())
93 return restart_syscall();
94
95 if (dev_isalive(netdev)) {
96 ret = (*set)(netdev, new);
97 if (ret == 0)
98 ret = len;
99 }
100 rtnl_unlock();
101 err:
102 return ret;
103 }
104
105 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
106 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
107 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
108 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
109 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
110 NETDEVICE_SHOW_RO(type, fmt_dec);
111 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
112
iflink_show(struct device * dev,struct device_attribute * attr,char * buf)113 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
114 char *buf)
115 {
116 struct net_device *ndev = to_net_dev(dev);
117
118 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
119 }
120 static DEVICE_ATTR_RO(iflink);
121
format_name_assign_type(const struct net_device * dev,char * buf)122 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
123 {
124 return sprintf(buf, fmt_dec, dev->name_assign_type);
125 }
126
name_assign_type_show(struct device * dev,struct device_attribute * attr,char * buf)127 static ssize_t name_assign_type_show(struct device *dev,
128 struct device_attribute *attr,
129 char *buf)
130 {
131 struct net_device *ndev = to_net_dev(dev);
132 ssize_t ret = -EINVAL;
133
134 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
135 ret = netdev_show(dev, attr, buf, format_name_assign_type);
136
137 return ret;
138 }
139 static DEVICE_ATTR_RO(name_assign_type);
140
141 /* use same locking rules as GIFHWADDR ioctl's */
address_show(struct device * dev,struct device_attribute * attr,char * buf)142 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
143 char *buf)
144 {
145 struct net_device *ndev = to_net_dev(dev);
146 ssize_t ret = -EINVAL;
147
148 read_lock(&dev_base_lock);
149 if (dev_isalive(ndev))
150 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
151 read_unlock(&dev_base_lock);
152 return ret;
153 }
154 static DEVICE_ATTR_RO(address);
155
broadcast_show(struct device * dev,struct device_attribute * attr,char * buf)156 static ssize_t broadcast_show(struct device *dev,
157 struct device_attribute *attr, char *buf)
158 {
159 struct net_device *ndev = to_net_dev(dev);
160
161 if (dev_isalive(ndev))
162 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
163 return -EINVAL;
164 }
165 static DEVICE_ATTR_RO(broadcast);
166
change_carrier(struct net_device * dev,unsigned long new_carrier)167 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
168 {
169 if (!netif_running(dev))
170 return -EINVAL;
171 return dev_change_carrier(dev, (bool)new_carrier);
172 }
173
carrier_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)174 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
175 const char *buf, size_t len)
176 {
177 struct net_device *netdev = to_net_dev(dev);
178
179 /* The check is also done in change_carrier; this helps returning early
180 * without hitting the trylock/restart in netdev_store.
181 */
182 if (!netdev->netdev_ops->ndo_change_carrier)
183 return -EOPNOTSUPP;
184
185 return netdev_store(dev, attr, buf, len, change_carrier);
186 }
187
carrier_show(struct device * dev,struct device_attribute * attr,char * buf)188 static ssize_t carrier_show(struct device *dev,
189 struct device_attribute *attr, char *buf)
190 {
191 struct net_device *netdev = to_net_dev(dev);
192
193 if (netif_running(netdev))
194 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
195
196 return -EINVAL;
197 }
198 static DEVICE_ATTR_RW(carrier);
199
speed_show(struct device * dev,struct device_attribute * attr,char * buf)200 static ssize_t speed_show(struct device *dev,
201 struct device_attribute *attr, char *buf)
202 {
203 struct net_device *netdev = to_net_dev(dev);
204 int ret = -EINVAL;
205
206 /* The check is also done in __ethtool_get_link_ksettings; this helps
207 * returning early without hitting the trylock/restart below.
208 */
209 if (!netdev->ethtool_ops->get_link_ksettings)
210 return ret;
211
212 if (!rtnl_trylock())
213 return restart_syscall();
214
215 if (netif_running(netdev) && netif_device_present(netdev)) {
216 struct ethtool_link_ksettings cmd;
217
218 if (!__ethtool_get_link_ksettings(netdev, &cmd))
219 ret = sprintf(buf, fmt_dec, cmd.base.speed);
220 }
221 rtnl_unlock();
222 return ret;
223 }
224 static DEVICE_ATTR_RO(speed);
225
duplex_show(struct device * dev,struct device_attribute * attr,char * buf)226 static ssize_t duplex_show(struct device *dev,
227 struct device_attribute *attr, char *buf)
228 {
229 struct net_device *netdev = to_net_dev(dev);
230 int ret = -EINVAL;
231
232 /* The check is also done in __ethtool_get_link_ksettings; this helps
233 * returning early without hitting the trylock/restart below.
234 */
235 if (!netdev->ethtool_ops->get_link_ksettings)
236 return ret;
237
238 if (!rtnl_trylock())
239 return restart_syscall();
240
241 if (netif_running(netdev)) {
242 struct ethtool_link_ksettings cmd;
243
244 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
245 const char *duplex;
246
247 switch (cmd.base.duplex) {
248 case DUPLEX_HALF:
249 duplex = "half";
250 break;
251 case DUPLEX_FULL:
252 duplex = "full";
253 break;
254 default:
255 duplex = "unknown";
256 break;
257 }
258 ret = sprintf(buf, "%s\n", duplex);
259 }
260 }
261 rtnl_unlock();
262 return ret;
263 }
264 static DEVICE_ATTR_RO(duplex);
265
dormant_show(struct device * dev,struct device_attribute * attr,char * buf)266 static ssize_t dormant_show(struct device *dev,
267 struct device_attribute *attr, char *buf)
268 {
269 struct net_device *netdev = to_net_dev(dev);
270
271 if (netif_running(netdev))
272 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
273
274 return -EINVAL;
275 }
276 static DEVICE_ATTR_RO(dormant);
277
278 static const char *const operstates[] = {
279 "unknown",
280 "notpresent", /* currently unused */
281 "down",
282 "lowerlayerdown",
283 "testing", /* currently unused */
284 "dormant",
285 "up"
286 };
287
operstate_show(struct device * dev,struct device_attribute * attr,char * buf)288 static ssize_t operstate_show(struct device *dev,
289 struct device_attribute *attr, char *buf)
290 {
291 const struct net_device *netdev = to_net_dev(dev);
292 unsigned char operstate;
293
294 read_lock(&dev_base_lock);
295 operstate = netdev->operstate;
296 if (!netif_running(netdev))
297 operstate = IF_OPER_DOWN;
298 read_unlock(&dev_base_lock);
299
300 if (operstate >= ARRAY_SIZE(operstates))
301 return -EINVAL; /* should not happen */
302
303 return sprintf(buf, "%s\n", operstates[operstate]);
304 }
305 static DEVICE_ATTR_RO(operstate);
306
carrier_changes_show(struct device * dev,struct device_attribute * attr,char * buf)307 static ssize_t carrier_changes_show(struct device *dev,
308 struct device_attribute *attr,
309 char *buf)
310 {
311 struct net_device *netdev = to_net_dev(dev);
312
313 return sprintf(buf, fmt_dec,
314 atomic_read(&netdev->carrier_up_count) +
315 atomic_read(&netdev->carrier_down_count));
316 }
317 static DEVICE_ATTR_RO(carrier_changes);
318
carrier_up_count_show(struct device * dev,struct device_attribute * attr,char * buf)319 static ssize_t carrier_up_count_show(struct device *dev,
320 struct device_attribute *attr,
321 char *buf)
322 {
323 struct net_device *netdev = to_net_dev(dev);
324
325 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
326 }
327 static DEVICE_ATTR_RO(carrier_up_count);
328
carrier_down_count_show(struct device * dev,struct device_attribute * attr,char * buf)329 static ssize_t carrier_down_count_show(struct device *dev,
330 struct device_attribute *attr,
331 char *buf)
332 {
333 struct net_device *netdev = to_net_dev(dev);
334
335 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
336 }
337 static DEVICE_ATTR_RO(carrier_down_count);
338
339 /* read-write attributes */
340
change_mtu(struct net_device * dev,unsigned long new_mtu)341 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
342 {
343 return dev_set_mtu(dev, (int)new_mtu);
344 }
345
mtu_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)346 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
347 const char *buf, size_t len)
348 {
349 return netdev_store(dev, attr, buf, len, change_mtu);
350 }
351 NETDEVICE_SHOW_RW(mtu, fmt_dec);
352
change_flags(struct net_device * dev,unsigned long new_flags)353 static int change_flags(struct net_device *dev, unsigned long new_flags)
354 {
355 return dev_change_flags(dev, (unsigned int)new_flags, NULL);
356 }
357
flags_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)358 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
359 const char *buf, size_t len)
360 {
361 return netdev_store(dev, attr, buf, len, change_flags);
362 }
363 NETDEVICE_SHOW_RW(flags, fmt_hex);
364
tx_queue_len_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)365 static ssize_t tx_queue_len_store(struct device *dev,
366 struct device_attribute *attr,
367 const char *buf, size_t len)
368 {
369 if (!capable(CAP_NET_ADMIN))
370 return -EPERM;
371
372 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
373 }
374 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
375
change_gro_flush_timeout(struct net_device * dev,unsigned long val)376 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
377 {
378 dev->gro_flush_timeout = val;
379 return 0;
380 }
381
gro_flush_timeout_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)382 static ssize_t gro_flush_timeout_store(struct device *dev,
383 struct device_attribute *attr,
384 const char *buf, size_t len)
385 {
386 if (!capable(CAP_NET_ADMIN))
387 return -EPERM;
388
389 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
390 }
391 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
392
ifalias_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)393 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
394 const char *buf, size_t len)
395 {
396 struct net_device *netdev = to_net_dev(dev);
397 struct net *net = dev_net(netdev);
398 size_t count = len;
399 ssize_t ret = 0;
400
401 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
402 return -EPERM;
403
404 /* ignore trailing newline */
405 if (len > 0 && buf[len - 1] == '\n')
406 --count;
407
408 if (!rtnl_trylock())
409 return restart_syscall();
410
411 if (dev_isalive(netdev)) {
412 ret = dev_set_alias(netdev, buf, count);
413 if (ret < 0)
414 goto err;
415 ret = len;
416 netdev_state_change(netdev);
417 }
418 err:
419 rtnl_unlock();
420
421 return ret;
422 }
423
ifalias_show(struct device * dev,struct device_attribute * attr,char * buf)424 static ssize_t ifalias_show(struct device *dev,
425 struct device_attribute *attr, char *buf)
426 {
427 const struct net_device *netdev = to_net_dev(dev);
428 char tmp[IFALIASZ];
429 ssize_t ret = 0;
430
431 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
432 if (ret > 0)
433 ret = sprintf(buf, "%s\n", tmp);
434 return ret;
435 }
436 static DEVICE_ATTR_RW(ifalias);
437
change_group(struct net_device * dev,unsigned long new_group)438 static int change_group(struct net_device *dev, unsigned long new_group)
439 {
440 dev_set_group(dev, (int)new_group);
441 return 0;
442 }
443
group_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)444 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
445 const char *buf, size_t len)
446 {
447 return netdev_store(dev, attr, buf, len, change_group);
448 }
449 NETDEVICE_SHOW(group, fmt_dec);
450 static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
451
change_proto_down(struct net_device * dev,unsigned long proto_down)452 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
453 {
454 return dev_change_proto_down(dev, (bool)proto_down);
455 }
456
proto_down_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)457 static ssize_t proto_down_store(struct device *dev,
458 struct device_attribute *attr,
459 const char *buf, size_t len)
460 {
461 struct net_device *netdev = to_net_dev(dev);
462
463 /* The check is also done in change_proto_down; this helps returning
464 * early without hitting the trylock/restart in netdev_store.
465 */
466 if (!netdev->netdev_ops->ndo_change_proto_down)
467 return -EOPNOTSUPP;
468
469 return netdev_store(dev, attr, buf, len, change_proto_down);
470 }
471 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
472
phys_port_id_show(struct device * dev,struct device_attribute * attr,char * buf)473 static ssize_t phys_port_id_show(struct device *dev,
474 struct device_attribute *attr, char *buf)
475 {
476 struct net_device *netdev = to_net_dev(dev);
477 ssize_t ret = -EINVAL;
478
479 /* The check is also done in dev_get_phys_port_id; this helps returning
480 * early without hitting the trylock/restart below.
481 */
482 if (!netdev->netdev_ops->ndo_get_phys_port_id)
483 return -EOPNOTSUPP;
484
485 if (!rtnl_trylock())
486 return restart_syscall();
487
488 if (dev_isalive(netdev)) {
489 struct netdev_phys_item_id ppid;
490
491 ret = dev_get_phys_port_id(netdev, &ppid);
492 if (!ret)
493 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
494 }
495 rtnl_unlock();
496
497 return ret;
498 }
499 static DEVICE_ATTR_RO(phys_port_id);
500
phys_port_name_show(struct device * dev,struct device_attribute * attr,char * buf)501 static ssize_t phys_port_name_show(struct device *dev,
502 struct device_attribute *attr, char *buf)
503 {
504 struct net_device *netdev = to_net_dev(dev);
505 ssize_t ret = -EINVAL;
506
507 /* The checks are also done in dev_get_phys_port_name; this helps
508 * returning early without hitting the trylock/restart below.
509 */
510 if (!netdev->netdev_ops->ndo_get_phys_port_name &&
511 !netdev->netdev_ops->ndo_get_devlink_port)
512 return -EOPNOTSUPP;
513
514 if (!rtnl_trylock())
515 return restart_syscall();
516
517 if (dev_isalive(netdev)) {
518 char name[IFNAMSIZ];
519
520 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
521 if (!ret)
522 ret = sprintf(buf, "%s\n", name);
523 }
524 rtnl_unlock();
525
526 return ret;
527 }
528 static DEVICE_ATTR_RO(phys_port_name);
529
phys_switch_id_show(struct device * dev,struct device_attribute * attr,char * buf)530 static ssize_t phys_switch_id_show(struct device *dev,
531 struct device_attribute *attr, char *buf)
532 {
533 struct net_device *netdev = to_net_dev(dev);
534 ssize_t ret = -EINVAL;
535
536 /* The checks are also done in dev_get_phys_port_name; this helps
537 * returning early without hitting the trylock/restart below. This works
538 * because recurse is false when calling dev_get_port_parent_id.
539 */
540 if (!netdev->netdev_ops->ndo_get_port_parent_id &&
541 !netdev->netdev_ops->ndo_get_devlink_port)
542 return -EOPNOTSUPP;
543
544 if (!rtnl_trylock())
545 return restart_syscall();
546
547 if (dev_isalive(netdev)) {
548 struct netdev_phys_item_id ppid = { };
549
550 ret = dev_get_port_parent_id(netdev, &ppid, false);
551 if (!ret)
552 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
553 }
554 rtnl_unlock();
555
556 return ret;
557 }
558 static DEVICE_ATTR_RO(phys_switch_id);
559
560 static struct attribute *net_class_attrs[] __ro_after_init = {
561 &dev_attr_netdev_group.attr,
562 &dev_attr_type.attr,
563 &dev_attr_dev_id.attr,
564 &dev_attr_dev_port.attr,
565 &dev_attr_iflink.attr,
566 &dev_attr_ifindex.attr,
567 &dev_attr_name_assign_type.attr,
568 &dev_attr_addr_assign_type.attr,
569 &dev_attr_addr_len.attr,
570 &dev_attr_link_mode.attr,
571 &dev_attr_address.attr,
572 &dev_attr_broadcast.attr,
573 &dev_attr_speed.attr,
574 &dev_attr_duplex.attr,
575 &dev_attr_dormant.attr,
576 &dev_attr_operstate.attr,
577 &dev_attr_carrier_changes.attr,
578 &dev_attr_ifalias.attr,
579 &dev_attr_carrier.attr,
580 &dev_attr_mtu.attr,
581 &dev_attr_flags.attr,
582 &dev_attr_tx_queue_len.attr,
583 &dev_attr_gro_flush_timeout.attr,
584 &dev_attr_phys_port_id.attr,
585 &dev_attr_phys_port_name.attr,
586 &dev_attr_phys_switch_id.attr,
587 &dev_attr_proto_down.attr,
588 &dev_attr_carrier_up_count.attr,
589 &dev_attr_carrier_down_count.attr,
590 NULL,
591 };
592 ATTRIBUTE_GROUPS(net_class);
593
594 /* Show a given an attribute in the statistics group */
netstat_show(const struct device * d,struct device_attribute * attr,char * buf,unsigned long offset)595 static ssize_t netstat_show(const struct device *d,
596 struct device_attribute *attr, char *buf,
597 unsigned long offset)
598 {
599 struct net_device *dev = to_net_dev(d);
600 ssize_t ret = -EINVAL;
601
602 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
603 offset % sizeof(u64) != 0);
604
605 read_lock(&dev_base_lock);
606 if (dev_isalive(dev)) {
607 struct rtnl_link_stats64 temp;
608 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
609
610 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
611 }
612 read_unlock(&dev_base_lock);
613 return ret;
614 }
615
616 /* generate a read-only statistics attribute */
617 #define NETSTAT_ENTRY(name) \
618 static ssize_t name##_show(struct device *d, \
619 struct device_attribute *attr, char *buf) \
620 { \
621 return netstat_show(d, attr, buf, \
622 offsetof(struct rtnl_link_stats64, name)); \
623 } \
624 static DEVICE_ATTR_RO(name)
625
626 NETSTAT_ENTRY(rx_packets);
627 NETSTAT_ENTRY(tx_packets);
628 NETSTAT_ENTRY(rx_bytes);
629 NETSTAT_ENTRY(tx_bytes);
630 NETSTAT_ENTRY(rx_errors);
631 NETSTAT_ENTRY(tx_errors);
632 NETSTAT_ENTRY(rx_dropped);
633 NETSTAT_ENTRY(tx_dropped);
634 NETSTAT_ENTRY(multicast);
635 NETSTAT_ENTRY(collisions);
636 NETSTAT_ENTRY(rx_length_errors);
637 NETSTAT_ENTRY(rx_over_errors);
638 NETSTAT_ENTRY(rx_crc_errors);
639 NETSTAT_ENTRY(rx_frame_errors);
640 NETSTAT_ENTRY(rx_fifo_errors);
641 NETSTAT_ENTRY(rx_missed_errors);
642 NETSTAT_ENTRY(tx_aborted_errors);
643 NETSTAT_ENTRY(tx_carrier_errors);
644 NETSTAT_ENTRY(tx_fifo_errors);
645 NETSTAT_ENTRY(tx_heartbeat_errors);
646 NETSTAT_ENTRY(tx_window_errors);
647 NETSTAT_ENTRY(rx_compressed);
648 NETSTAT_ENTRY(tx_compressed);
649 NETSTAT_ENTRY(rx_nohandler);
650
651 static struct attribute *netstat_attrs[] __ro_after_init = {
652 &dev_attr_rx_packets.attr,
653 &dev_attr_tx_packets.attr,
654 &dev_attr_rx_bytes.attr,
655 &dev_attr_tx_bytes.attr,
656 &dev_attr_rx_errors.attr,
657 &dev_attr_tx_errors.attr,
658 &dev_attr_rx_dropped.attr,
659 &dev_attr_tx_dropped.attr,
660 &dev_attr_multicast.attr,
661 &dev_attr_collisions.attr,
662 &dev_attr_rx_length_errors.attr,
663 &dev_attr_rx_over_errors.attr,
664 &dev_attr_rx_crc_errors.attr,
665 &dev_attr_rx_frame_errors.attr,
666 &dev_attr_rx_fifo_errors.attr,
667 &dev_attr_rx_missed_errors.attr,
668 &dev_attr_tx_aborted_errors.attr,
669 &dev_attr_tx_carrier_errors.attr,
670 &dev_attr_tx_fifo_errors.attr,
671 &dev_attr_tx_heartbeat_errors.attr,
672 &dev_attr_tx_window_errors.attr,
673 &dev_attr_rx_compressed.attr,
674 &dev_attr_tx_compressed.attr,
675 &dev_attr_rx_nohandler.attr,
676 NULL
677 };
678
679 static const struct attribute_group netstat_group = {
680 .name = "statistics",
681 .attrs = netstat_attrs,
682 };
683
684 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
685 static struct attribute *wireless_attrs[] = {
686 NULL
687 };
688
689 static const struct attribute_group wireless_group = {
690 .name = "wireless",
691 .attrs = wireless_attrs,
692 };
693 #endif
694
695 #else /* CONFIG_SYSFS */
696 #define net_class_groups NULL
697 #endif /* CONFIG_SYSFS */
698
699 #ifdef CONFIG_SYSFS
700 #define to_rx_queue_attr(_attr) \
701 container_of(_attr, struct rx_queue_attribute, attr)
702
703 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
704
rx_queue_attr_show(struct kobject * kobj,struct attribute * attr,char * buf)705 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
706 char *buf)
707 {
708 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
709 struct netdev_rx_queue *queue = to_rx_queue(kobj);
710
711 if (!attribute->show)
712 return -EIO;
713
714 return attribute->show(queue, buf);
715 }
716
rx_queue_attr_store(struct kobject * kobj,struct attribute * attr,const char * buf,size_t count)717 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
718 const char *buf, size_t count)
719 {
720 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
721 struct netdev_rx_queue *queue = to_rx_queue(kobj);
722
723 if (!attribute->store)
724 return -EIO;
725
726 return attribute->store(queue, buf, count);
727 }
728
729 static const struct sysfs_ops rx_queue_sysfs_ops = {
730 .show = rx_queue_attr_show,
731 .store = rx_queue_attr_store,
732 };
733
734 #ifdef CONFIG_RPS
show_rps_map(struct netdev_rx_queue * queue,char * buf)735 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
736 {
737 struct rps_map *map;
738 cpumask_var_t mask;
739 int i, len;
740
741 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
742 return -ENOMEM;
743
744 rcu_read_lock();
745 map = rcu_dereference(queue->rps_map);
746 if (map)
747 for (i = 0; i < map->len; i++)
748 cpumask_set_cpu(map->cpus[i], mask);
749
750 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
751 rcu_read_unlock();
752 free_cpumask_var(mask);
753
754 return len < PAGE_SIZE ? len : -EINVAL;
755 }
756
store_rps_map(struct netdev_rx_queue * queue,const char * buf,size_t len)757 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
758 const char *buf, size_t len)
759 {
760 struct rps_map *old_map, *map;
761 cpumask_var_t mask;
762 int err, cpu, i;
763 static DEFINE_MUTEX(rps_map_mutex);
764
765 if (!capable(CAP_NET_ADMIN))
766 return -EPERM;
767
768 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
769 return -ENOMEM;
770
771 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
772 if (err) {
773 free_cpumask_var(mask);
774 return err;
775 }
776
777 map = kzalloc(max_t(unsigned int,
778 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
779 GFP_KERNEL);
780 if (!map) {
781 free_cpumask_var(mask);
782 return -ENOMEM;
783 }
784
785 i = 0;
786 for_each_cpu_and(cpu, mask, cpu_online_mask)
787 map->cpus[i++] = cpu;
788
789 if (i) {
790 map->len = i;
791 } else {
792 kfree(map);
793 map = NULL;
794 }
795
796 mutex_lock(&rps_map_mutex);
797 old_map = rcu_dereference_protected(queue->rps_map,
798 mutex_is_locked(&rps_map_mutex));
799 rcu_assign_pointer(queue->rps_map, map);
800
801 if (map)
802 static_branch_inc(&rps_needed);
803 if (old_map)
804 static_branch_dec(&rps_needed);
805
806 mutex_unlock(&rps_map_mutex);
807
808 if (old_map)
809 kfree_rcu(old_map, rcu);
810
811 free_cpumask_var(mask);
812 return len;
813 }
814
show_rps_dev_flow_table_cnt(struct netdev_rx_queue * queue,char * buf)815 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
816 char *buf)
817 {
818 struct rps_dev_flow_table *flow_table;
819 unsigned long val = 0;
820
821 rcu_read_lock();
822 flow_table = rcu_dereference(queue->rps_flow_table);
823 if (flow_table)
824 val = (unsigned long)flow_table->mask + 1;
825 rcu_read_unlock();
826
827 return sprintf(buf, "%lu\n", val);
828 }
829
rps_dev_flow_table_release(struct rcu_head * rcu)830 static void rps_dev_flow_table_release(struct rcu_head *rcu)
831 {
832 struct rps_dev_flow_table *table = container_of(rcu,
833 struct rps_dev_flow_table, rcu);
834 vfree(table);
835 }
836
store_rps_dev_flow_table_cnt(struct netdev_rx_queue * queue,const char * buf,size_t len)837 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
838 const char *buf, size_t len)
839 {
840 unsigned long mask, count;
841 struct rps_dev_flow_table *table, *old_table;
842 static DEFINE_SPINLOCK(rps_dev_flow_lock);
843 int rc;
844
845 if (!capable(CAP_NET_ADMIN))
846 return -EPERM;
847
848 rc = kstrtoul(buf, 0, &count);
849 if (rc < 0)
850 return rc;
851
852 if (count) {
853 mask = count - 1;
854 /* mask = roundup_pow_of_two(count) - 1;
855 * without overflows...
856 */
857 while ((mask | (mask >> 1)) != mask)
858 mask |= (mask >> 1);
859 /* On 64 bit arches, must check mask fits in table->mask (u32),
860 * and on 32bit arches, must check
861 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
862 */
863 #if BITS_PER_LONG > 32
864 if (mask > (unsigned long)(u32)mask)
865 return -EINVAL;
866 #else
867 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
868 / sizeof(struct rps_dev_flow)) {
869 /* Enforce a limit to prevent overflow */
870 return -EINVAL;
871 }
872 #endif
873 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
874 if (!table)
875 return -ENOMEM;
876
877 table->mask = mask;
878 for (count = 0; count <= mask; count++)
879 table->flows[count].cpu = RPS_NO_CPU;
880 } else {
881 table = NULL;
882 }
883
884 spin_lock(&rps_dev_flow_lock);
885 old_table = rcu_dereference_protected(queue->rps_flow_table,
886 lockdep_is_held(&rps_dev_flow_lock));
887 rcu_assign_pointer(queue->rps_flow_table, table);
888 spin_unlock(&rps_dev_flow_lock);
889
890 if (old_table)
891 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
892
893 return len;
894 }
895
896 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
897 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
898
899 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
900 = __ATTR(rps_flow_cnt, 0644,
901 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
902 #endif /* CONFIG_RPS */
903
904 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
905 #ifdef CONFIG_RPS
906 &rps_cpus_attribute.attr,
907 &rps_dev_flow_table_cnt_attribute.attr,
908 #endif
909 NULL
910 };
911 ATTRIBUTE_GROUPS(rx_queue_default);
912
rx_queue_release(struct kobject * kobj)913 static void rx_queue_release(struct kobject *kobj)
914 {
915 struct netdev_rx_queue *queue = to_rx_queue(kobj);
916 #ifdef CONFIG_RPS
917 struct rps_map *map;
918 struct rps_dev_flow_table *flow_table;
919
920 map = rcu_dereference_protected(queue->rps_map, 1);
921 if (map) {
922 RCU_INIT_POINTER(queue->rps_map, NULL);
923 kfree_rcu(map, rcu);
924 }
925
926 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
927 if (flow_table) {
928 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
929 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
930 }
931 #endif
932
933 memset(kobj, 0, sizeof(*kobj));
934 dev_put(queue->dev);
935 }
936
rx_queue_namespace(struct kobject * kobj)937 static const void *rx_queue_namespace(struct kobject *kobj)
938 {
939 struct netdev_rx_queue *queue = to_rx_queue(kobj);
940 struct device *dev = &queue->dev->dev;
941 const void *ns = NULL;
942
943 if (dev->class && dev->class->ns_type)
944 ns = dev->class->namespace(dev);
945
946 return ns;
947 }
948
rx_queue_get_ownership(struct kobject * kobj,kuid_t * uid,kgid_t * gid)949 static void rx_queue_get_ownership(struct kobject *kobj,
950 kuid_t *uid, kgid_t *gid)
951 {
952 const struct net *net = rx_queue_namespace(kobj);
953
954 net_ns_get_ownership(net, uid, gid);
955 }
956
957 static struct kobj_type rx_queue_ktype __ro_after_init = {
958 .sysfs_ops = &rx_queue_sysfs_ops,
959 .release = rx_queue_release,
960 .default_groups = rx_queue_default_groups,
961 .namespace = rx_queue_namespace,
962 .get_ownership = rx_queue_get_ownership,
963 };
964
rx_queue_add_kobject(struct net_device * dev,int index)965 static int rx_queue_add_kobject(struct net_device *dev, int index)
966 {
967 struct netdev_rx_queue *queue = dev->_rx + index;
968 struct kobject *kobj = &queue->kobj;
969 int error = 0;
970
971 /* Kobject_put later will trigger rx_queue_release call which
972 * decreases dev refcount: Take that reference here
973 */
974 dev_hold(queue->dev);
975
976 kobj->kset = dev->queues_kset;
977 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
978 "rx-%u", index);
979 if (error)
980 goto err;
981
982 if (dev->sysfs_rx_queue_group) {
983 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
984 if (error)
985 goto err;
986 }
987
988 kobject_uevent(kobj, KOBJ_ADD);
989
990 return error;
991
992 err:
993 kobject_put(kobj);
994 return error;
995 }
996 #endif /* CONFIG_SYSFS */
997
998 int
net_rx_queue_update_kobjects(struct net_device * dev,int old_num,int new_num)999 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1000 {
1001 #ifdef CONFIG_SYSFS
1002 int i;
1003 int error = 0;
1004
1005 #ifndef CONFIG_RPS
1006 if (!dev->sysfs_rx_queue_group)
1007 return 0;
1008 #endif
1009 for (i = old_num; i < new_num; i++) {
1010 error = rx_queue_add_kobject(dev, i);
1011 if (error) {
1012 new_num = old_num;
1013 break;
1014 }
1015 }
1016
1017 while (--i >= new_num) {
1018 struct kobject *kobj = &dev->_rx[i].kobj;
1019
1020 if (!refcount_read(&dev_net(dev)->count))
1021 kobj->uevent_suppress = 1;
1022 if (dev->sysfs_rx_queue_group)
1023 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
1024 kobject_put(kobj);
1025 }
1026
1027 return error;
1028 #else
1029 return 0;
1030 #endif
1031 }
1032
1033 #ifdef CONFIG_SYSFS
1034 /*
1035 * netdev_queue sysfs structures and functions.
1036 */
1037 struct netdev_queue_attribute {
1038 struct attribute attr;
1039 ssize_t (*show)(struct netdev_queue *queue, char *buf);
1040 ssize_t (*store)(struct netdev_queue *queue,
1041 const char *buf, size_t len);
1042 };
1043 #define to_netdev_queue_attr(_attr) \
1044 container_of(_attr, struct netdev_queue_attribute, attr)
1045
1046 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1047
netdev_queue_attr_show(struct kobject * kobj,struct attribute * attr,char * buf)1048 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1049 struct attribute *attr, char *buf)
1050 {
1051 const struct netdev_queue_attribute *attribute
1052 = to_netdev_queue_attr(attr);
1053 struct netdev_queue *queue = to_netdev_queue(kobj);
1054
1055 if (!attribute->show)
1056 return -EIO;
1057
1058 return attribute->show(queue, buf);
1059 }
1060
netdev_queue_attr_store(struct kobject * kobj,struct attribute * attr,const char * buf,size_t count)1061 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1062 struct attribute *attr,
1063 const char *buf, size_t count)
1064 {
1065 const struct netdev_queue_attribute *attribute
1066 = to_netdev_queue_attr(attr);
1067 struct netdev_queue *queue = to_netdev_queue(kobj);
1068
1069 if (!attribute->store)
1070 return -EIO;
1071
1072 return attribute->store(queue, buf, count);
1073 }
1074
1075 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1076 .show = netdev_queue_attr_show,
1077 .store = netdev_queue_attr_store,
1078 };
1079
tx_timeout_show(struct netdev_queue * queue,char * buf)1080 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1081 {
1082 unsigned long trans_timeout;
1083
1084 spin_lock_irq(&queue->_xmit_lock);
1085 trans_timeout = queue->trans_timeout;
1086 spin_unlock_irq(&queue->_xmit_lock);
1087
1088 return sprintf(buf, fmt_ulong, trans_timeout);
1089 }
1090
get_netdev_queue_index(struct netdev_queue * queue)1091 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1092 {
1093 struct net_device *dev = queue->dev;
1094 unsigned int i;
1095
1096 i = queue - dev->_tx;
1097 BUG_ON(i >= dev->num_tx_queues);
1098
1099 return i;
1100 }
1101
traffic_class_show(struct netdev_queue * queue,char * buf)1102 static ssize_t traffic_class_show(struct netdev_queue *queue,
1103 char *buf)
1104 {
1105 struct net_device *dev = queue->dev;
1106 int index;
1107 int tc;
1108
1109 if (!netif_is_multiqueue(dev))
1110 return -ENOENT;
1111
1112 index = get_netdev_queue_index(queue);
1113
1114 /* If queue belongs to subordinate dev use its TC mapping */
1115 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1116
1117 tc = netdev_txq_to_tc(dev, index);
1118 if (tc < 0)
1119 return -EINVAL;
1120
1121 /* We can report the traffic class one of two ways:
1122 * Subordinate device traffic classes are reported with the traffic
1123 * class first, and then the subordinate class so for example TC0 on
1124 * subordinate device 2 will be reported as "0-2". If the queue
1125 * belongs to the root device it will be reported with just the
1126 * traffic class, so just "0" for TC 0 for example.
1127 */
1128 return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1129 sprintf(buf, "%u\n", tc);
1130 }
1131
1132 #ifdef CONFIG_XPS
tx_maxrate_show(struct netdev_queue * queue,char * buf)1133 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1134 char *buf)
1135 {
1136 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1137 }
1138
tx_maxrate_store(struct netdev_queue * queue,const char * buf,size_t len)1139 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1140 const char *buf, size_t len)
1141 {
1142 struct net_device *dev = queue->dev;
1143 int err, index = get_netdev_queue_index(queue);
1144 u32 rate = 0;
1145
1146 if (!capable(CAP_NET_ADMIN))
1147 return -EPERM;
1148
1149 /* The check is also done later; this helps returning early without
1150 * hitting the trylock/restart below.
1151 */
1152 if (!dev->netdev_ops->ndo_set_tx_maxrate)
1153 return -EOPNOTSUPP;
1154
1155 err = kstrtou32(buf, 10, &rate);
1156 if (err < 0)
1157 return err;
1158
1159 if (!rtnl_trylock())
1160 return restart_syscall();
1161
1162 err = -EOPNOTSUPP;
1163 if (dev->netdev_ops->ndo_set_tx_maxrate)
1164 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1165
1166 rtnl_unlock();
1167 if (!err) {
1168 queue->tx_maxrate = rate;
1169 return len;
1170 }
1171 return err;
1172 }
1173
1174 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1175 = __ATTR_RW(tx_maxrate);
1176 #endif
1177
1178 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1179 = __ATTR_RO(tx_timeout);
1180
1181 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1182 = __ATTR_RO(traffic_class);
1183
1184 #ifdef CONFIG_BQL
1185 /*
1186 * Byte queue limits sysfs structures and functions.
1187 */
bql_show(char * buf,unsigned int value)1188 static ssize_t bql_show(char *buf, unsigned int value)
1189 {
1190 return sprintf(buf, "%u\n", value);
1191 }
1192
bql_set(const char * buf,const size_t count,unsigned int * pvalue)1193 static ssize_t bql_set(const char *buf, const size_t count,
1194 unsigned int *pvalue)
1195 {
1196 unsigned int value;
1197 int err;
1198
1199 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1200 value = DQL_MAX_LIMIT;
1201 } else {
1202 err = kstrtouint(buf, 10, &value);
1203 if (err < 0)
1204 return err;
1205 if (value > DQL_MAX_LIMIT)
1206 return -EINVAL;
1207 }
1208
1209 *pvalue = value;
1210
1211 return count;
1212 }
1213
bql_show_hold_time(struct netdev_queue * queue,char * buf)1214 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1215 char *buf)
1216 {
1217 struct dql *dql = &queue->dql;
1218
1219 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1220 }
1221
bql_set_hold_time(struct netdev_queue * queue,const char * buf,size_t len)1222 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1223 const char *buf, size_t len)
1224 {
1225 struct dql *dql = &queue->dql;
1226 unsigned int value;
1227 int err;
1228
1229 err = kstrtouint(buf, 10, &value);
1230 if (err < 0)
1231 return err;
1232
1233 dql->slack_hold_time = msecs_to_jiffies(value);
1234
1235 return len;
1236 }
1237
1238 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1239 = __ATTR(hold_time, 0644,
1240 bql_show_hold_time, bql_set_hold_time);
1241
bql_show_inflight(struct netdev_queue * queue,char * buf)1242 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1243 char *buf)
1244 {
1245 struct dql *dql = &queue->dql;
1246
1247 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1248 }
1249
1250 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1251 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1252
1253 #define BQL_ATTR(NAME, FIELD) \
1254 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1255 char *buf) \
1256 { \
1257 return bql_show(buf, queue->dql.FIELD); \
1258 } \
1259 \
1260 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1261 const char *buf, size_t len) \
1262 { \
1263 return bql_set(buf, len, &queue->dql.FIELD); \
1264 } \
1265 \
1266 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1267 = __ATTR(NAME, 0644, \
1268 bql_show_ ## NAME, bql_set_ ## NAME)
1269
1270 BQL_ATTR(limit, limit);
1271 BQL_ATTR(limit_max, max_limit);
1272 BQL_ATTR(limit_min, min_limit);
1273
1274 static struct attribute *dql_attrs[] __ro_after_init = {
1275 &bql_limit_attribute.attr,
1276 &bql_limit_max_attribute.attr,
1277 &bql_limit_min_attribute.attr,
1278 &bql_hold_time_attribute.attr,
1279 &bql_inflight_attribute.attr,
1280 NULL
1281 };
1282
1283 static const struct attribute_group dql_group = {
1284 .name = "byte_queue_limits",
1285 .attrs = dql_attrs,
1286 };
1287 #endif /* CONFIG_BQL */
1288
1289 #ifdef CONFIG_XPS
xps_cpus_show(struct netdev_queue * queue,char * buf)1290 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1291 char *buf)
1292 {
1293 int cpu, len, ret, num_tc = 1, tc = 0;
1294 struct net_device *dev = queue->dev;
1295 struct xps_dev_maps *dev_maps;
1296 cpumask_var_t mask;
1297 unsigned long index;
1298
1299 if (!netif_is_multiqueue(dev))
1300 return -ENOENT;
1301
1302 index = get_netdev_queue_index(queue);
1303
1304 if (!rtnl_trylock())
1305 return restart_syscall();
1306
1307 if (dev->num_tc) {
1308 /* Do not allow XPS on subordinate device directly */
1309 num_tc = dev->num_tc;
1310 if (num_tc < 0) {
1311 ret = -EINVAL;
1312 goto err_rtnl_unlock;
1313 }
1314
1315 /* If queue belongs to subordinate dev use its map */
1316 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1317
1318 tc = netdev_txq_to_tc(dev, index);
1319 if (tc < 0) {
1320 ret = -EINVAL;
1321 goto err_rtnl_unlock;
1322 }
1323 }
1324
1325 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
1326 ret = -ENOMEM;
1327 goto err_rtnl_unlock;
1328 }
1329
1330 rcu_read_lock();
1331 dev_maps = rcu_dereference(dev->xps_cpus_map);
1332 if (dev_maps) {
1333 for_each_possible_cpu(cpu) {
1334 int i, tci = cpu * num_tc + tc;
1335 struct xps_map *map;
1336
1337 map = rcu_dereference(dev_maps->attr_map[tci]);
1338 if (!map)
1339 continue;
1340
1341 for (i = map->len; i--;) {
1342 if (map->queues[i] == index) {
1343 cpumask_set_cpu(cpu, mask);
1344 break;
1345 }
1346 }
1347 }
1348 }
1349 rcu_read_unlock();
1350
1351 rtnl_unlock();
1352
1353 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1354 free_cpumask_var(mask);
1355 return len < PAGE_SIZE ? len : -EINVAL;
1356
1357 err_rtnl_unlock:
1358 rtnl_unlock();
1359 return ret;
1360 }
1361
xps_cpus_store(struct netdev_queue * queue,const char * buf,size_t len)1362 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1363 const char *buf, size_t len)
1364 {
1365 struct net_device *dev = queue->dev;
1366 unsigned long index;
1367 cpumask_var_t mask;
1368 int err;
1369
1370 if (!netif_is_multiqueue(dev))
1371 return -ENOENT;
1372
1373 if (!capable(CAP_NET_ADMIN))
1374 return -EPERM;
1375
1376 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1377 return -ENOMEM;
1378
1379 index = get_netdev_queue_index(queue);
1380
1381 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1382 if (err) {
1383 free_cpumask_var(mask);
1384 return err;
1385 }
1386
1387 if (!rtnl_trylock()) {
1388 free_cpumask_var(mask);
1389 return restart_syscall();
1390 }
1391
1392 err = netif_set_xps_queue(dev, mask, index);
1393 rtnl_unlock();
1394
1395 free_cpumask_var(mask);
1396
1397 return err ? : len;
1398 }
1399
1400 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1401 = __ATTR_RW(xps_cpus);
1402
xps_rxqs_show(struct netdev_queue * queue,char * buf)1403 static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1404 {
1405 int j, len, ret, num_tc = 1, tc = 0;
1406 struct net_device *dev = queue->dev;
1407 struct xps_dev_maps *dev_maps;
1408 unsigned long *mask, index;
1409
1410 index = get_netdev_queue_index(queue);
1411
1412 if (!rtnl_trylock())
1413 return restart_syscall();
1414
1415 if (dev->num_tc) {
1416 num_tc = dev->num_tc;
1417 tc = netdev_txq_to_tc(dev, index);
1418 if (tc < 0) {
1419 ret = -EINVAL;
1420 goto err_rtnl_unlock;
1421 }
1422 }
1423 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1424 if (!mask) {
1425 ret = -ENOMEM;
1426 goto err_rtnl_unlock;
1427 }
1428
1429 rcu_read_lock();
1430 dev_maps = rcu_dereference(dev->xps_rxqs_map);
1431 if (!dev_maps)
1432 goto out_no_maps;
1433
1434 for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1435 j < dev->num_rx_queues;) {
1436 int i, tci = j * num_tc + tc;
1437 struct xps_map *map;
1438
1439 map = rcu_dereference(dev_maps->attr_map[tci]);
1440 if (!map)
1441 continue;
1442
1443 for (i = map->len; i--;) {
1444 if (map->queues[i] == index) {
1445 set_bit(j, mask);
1446 break;
1447 }
1448 }
1449 }
1450 out_no_maps:
1451 rcu_read_unlock();
1452
1453 rtnl_unlock();
1454
1455 len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1456 bitmap_free(mask);
1457
1458 return len < PAGE_SIZE ? len : -EINVAL;
1459
1460 err_rtnl_unlock:
1461 rtnl_unlock();
1462 return ret;
1463 }
1464
xps_rxqs_store(struct netdev_queue * queue,const char * buf,size_t len)1465 static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1466 size_t len)
1467 {
1468 struct net_device *dev = queue->dev;
1469 struct net *net = dev_net(dev);
1470 unsigned long *mask, index;
1471 int err;
1472
1473 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1474 return -EPERM;
1475
1476 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1477 if (!mask)
1478 return -ENOMEM;
1479
1480 index = get_netdev_queue_index(queue);
1481
1482 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1483 if (err) {
1484 bitmap_free(mask);
1485 return err;
1486 }
1487
1488 if (!rtnl_trylock()) {
1489 bitmap_free(mask);
1490 return restart_syscall();
1491 }
1492
1493 cpus_read_lock();
1494 err = __netif_set_xps_queue(dev, mask, index, true);
1495 cpus_read_unlock();
1496
1497 rtnl_unlock();
1498
1499 bitmap_free(mask);
1500 return err ? : len;
1501 }
1502
1503 static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1504 = __ATTR_RW(xps_rxqs);
1505 #endif /* CONFIG_XPS */
1506
1507 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1508 &queue_trans_timeout.attr,
1509 &queue_traffic_class.attr,
1510 #ifdef CONFIG_XPS
1511 &xps_cpus_attribute.attr,
1512 &xps_rxqs_attribute.attr,
1513 &queue_tx_maxrate.attr,
1514 #endif
1515 NULL
1516 };
1517 ATTRIBUTE_GROUPS(netdev_queue_default);
1518
netdev_queue_release(struct kobject * kobj)1519 static void netdev_queue_release(struct kobject *kobj)
1520 {
1521 struct netdev_queue *queue = to_netdev_queue(kobj);
1522
1523 memset(kobj, 0, sizeof(*kobj));
1524 dev_put(queue->dev);
1525 }
1526
netdev_queue_namespace(struct kobject * kobj)1527 static const void *netdev_queue_namespace(struct kobject *kobj)
1528 {
1529 struct netdev_queue *queue = to_netdev_queue(kobj);
1530 struct device *dev = &queue->dev->dev;
1531 const void *ns = NULL;
1532
1533 if (dev->class && dev->class->ns_type)
1534 ns = dev->class->namespace(dev);
1535
1536 return ns;
1537 }
1538
netdev_queue_get_ownership(struct kobject * kobj,kuid_t * uid,kgid_t * gid)1539 static void netdev_queue_get_ownership(struct kobject *kobj,
1540 kuid_t *uid, kgid_t *gid)
1541 {
1542 const struct net *net = netdev_queue_namespace(kobj);
1543
1544 net_ns_get_ownership(net, uid, gid);
1545 }
1546
1547 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1548 .sysfs_ops = &netdev_queue_sysfs_ops,
1549 .release = netdev_queue_release,
1550 .default_groups = netdev_queue_default_groups,
1551 .namespace = netdev_queue_namespace,
1552 .get_ownership = netdev_queue_get_ownership,
1553 };
1554
netdev_queue_add_kobject(struct net_device * dev,int index)1555 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1556 {
1557 struct netdev_queue *queue = dev->_tx + index;
1558 struct kobject *kobj = &queue->kobj;
1559 int error = 0;
1560
1561 /* Kobject_put later will trigger netdev_queue_release call
1562 * which decreases dev refcount: Take that reference here
1563 */
1564 dev_hold(queue->dev);
1565
1566 kobj->kset = dev->queues_kset;
1567 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1568 "tx-%u", index);
1569 if (error)
1570 goto err;
1571
1572 #ifdef CONFIG_BQL
1573 error = sysfs_create_group(kobj, &dql_group);
1574 if (error)
1575 goto err;
1576 #endif
1577
1578 kobject_uevent(kobj, KOBJ_ADD);
1579 return 0;
1580
1581 err:
1582 kobject_put(kobj);
1583 return error;
1584 }
1585 #endif /* CONFIG_SYSFS */
1586
1587 int
netdev_queue_update_kobjects(struct net_device * dev,int old_num,int new_num)1588 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1589 {
1590 #ifdef CONFIG_SYSFS
1591 int i;
1592 int error = 0;
1593
1594 for (i = old_num; i < new_num; i++) {
1595 error = netdev_queue_add_kobject(dev, i);
1596 if (error) {
1597 new_num = old_num;
1598 break;
1599 }
1600 }
1601
1602 while (--i >= new_num) {
1603 struct netdev_queue *queue = dev->_tx + i;
1604
1605 if (!refcount_read(&dev_net(dev)->count))
1606 queue->kobj.uevent_suppress = 1;
1607 #ifdef CONFIG_BQL
1608 sysfs_remove_group(&queue->kobj, &dql_group);
1609 #endif
1610 kobject_put(&queue->kobj);
1611 }
1612
1613 return error;
1614 #else
1615 return 0;
1616 #endif /* CONFIG_SYSFS */
1617 }
1618
register_queue_kobjects(struct net_device * dev)1619 static int register_queue_kobjects(struct net_device *dev)
1620 {
1621 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1622
1623 #ifdef CONFIG_SYSFS
1624 dev->queues_kset = kset_create_and_add("queues",
1625 NULL, &dev->dev.kobj);
1626 if (!dev->queues_kset)
1627 return -ENOMEM;
1628 real_rx = dev->real_num_rx_queues;
1629 #endif
1630 real_tx = dev->real_num_tx_queues;
1631
1632 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1633 if (error)
1634 goto error;
1635 rxq = real_rx;
1636
1637 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1638 if (error)
1639 goto error;
1640 txq = real_tx;
1641
1642 return 0;
1643
1644 error:
1645 netdev_queue_update_kobjects(dev, txq, 0);
1646 net_rx_queue_update_kobjects(dev, rxq, 0);
1647 #ifdef CONFIG_SYSFS
1648 kset_unregister(dev->queues_kset);
1649 #endif
1650 return error;
1651 }
1652
remove_queue_kobjects(struct net_device * dev)1653 static void remove_queue_kobjects(struct net_device *dev)
1654 {
1655 int real_rx = 0, real_tx = 0;
1656
1657 #ifdef CONFIG_SYSFS
1658 real_rx = dev->real_num_rx_queues;
1659 #endif
1660 real_tx = dev->real_num_tx_queues;
1661
1662 net_rx_queue_update_kobjects(dev, real_rx, 0);
1663 netdev_queue_update_kobjects(dev, real_tx, 0);
1664
1665 dev->real_num_rx_queues = 0;
1666 dev->real_num_tx_queues = 0;
1667 #ifdef CONFIG_SYSFS
1668 kset_unregister(dev->queues_kset);
1669 #endif
1670 }
1671
net_current_may_mount(void)1672 static bool net_current_may_mount(void)
1673 {
1674 struct net *net = current->nsproxy->net_ns;
1675
1676 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1677 }
1678
net_grab_current_ns(void)1679 static void *net_grab_current_ns(void)
1680 {
1681 struct net *ns = current->nsproxy->net_ns;
1682 #ifdef CONFIG_NET_NS
1683 if (ns)
1684 refcount_inc(&ns->passive);
1685 #endif
1686 return ns;
1687 }
1688
net_initial_ns(void)1689 static const void *net_initial_ns(void)
1690 {
1691 return &init_net;
1692 }
1693
net_netlink_ns(struct sock * sk)1694 static const void *net_netlink_ns(struct sock *sk)
1695 {
1696 return sock_net(sk);
1697 }
1698
1699 const struct kobj_ns_type_operations net_ns_type_operations = {
1700 .type = KOBJ_NS_TYPE_NET,
1701 .current_may_mount = net_current_may_mount,
1702 .grab_current_ns = net_grab_current_ns,
1703 .netlink_ns = net_netlink_ns,
1704 .initial_ns = net_initial_ns,
1705 .drop_ns = net_drop_ns,
1706 };
1707 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1708
netdev_uevent(struct device * d,struct kobj_uevent_env * env)1709 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1710 {
1711 struct net_device *dev = to_net_dev(d);
1712 int retval;
1713
1714 /* pass interface to uevent. */
1715 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1716 if (retval)
1717 goto exit;
1718
1719 /* pass ifindex to uevent.
1720 * ifindex is useful as it won't change (interface name may change)
1721 * and is what RtNetlink uses natively.
1722 */
1723 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1724
1725 exit:
1726 return retval;
1727 }
1728
1729 /*
1730 * netdev_release -- destroy and free a dead device.
1731 * Called when last reference to device kobject is gone.
1732 */
netdev_release(struct device * d)1733 static void netdev_release(struct device *d)
1734 {
1735 struct net_device *dev = to_net_dev(d);
1736
1737 BUG_ON(dev->reg_state != NETREG_RELEASED);
1738
1739 /* no need to wait for rcu grace period:
1740 * device is dead and about to be freed.
1741 */
1742 kfree(rcu_access_pointer(dev->ifalias));
1743 netdev_freemem(dev);
1744 }
1745
net_namespace(struct device * d)1746 static const void *net_namespace(struct device *d)
1747 {
1748 struct net_device *dev = to_net_dev(d);
1749
1750 return dev_net(dev);
1751 }
1752
net_get_ownership(struct device * d,kuid_t * uid,kgid_t * gid)1753 static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1754 {
1755 struct net_device *dev = to_net_dev(d);
1756 const struct net *net = dev_net(dev);
1757
1758 net_ns_get_ownership(net, uid, gid);
1759 }
1760
1761 static struct class net_class __ro_after_init = {
1762 .name = "net",
1763 .dev_release = netdev_release,
1764 .dev_groups = net_class_groups,
1765 .dev_uevent = netdev_uevent,
1766 .ns_type = &net_ns_type_operations,
1767 .namespace = net_namespace,
1768 .get_ownership = net_get_ownership,
1769 };
1770
1771 #ifdef CONFIG_OF_NET
of_dev_node_match(struct device * dev,const void * data)1772 static int of_dev_node_match(struct device *dev, const void *data)
1773 {
1774 int ret = 0;
1775
1776 if (dev->parent)
1777 ret = dev->parent->of_node == data;
1778
1779 return ret == 0 ? dev->of_node == data : ret;
1780 }
1781
1782 /*
1783 * of_find_net_device_by_node - lookup the net device for the device node
1784 * @np: OF device node
1785 *
1786 * Looks up the net_device structure corresponding with the device node.
1787 * If successful, returns a pointer to the net_device with the embedded
1788 * struct device refcount incremented by one, or NULL on failure. The
1789 * refcount must be dropped when done with the net_device.
1790 */
of_find_net_device_by_node(struct device_node * np)1791 struct net_device *of_find_net_device_by_node(struct device_node *np)
1792 {
1793 struct device *dev;
1794
1795 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1796 if (!dev)
1797 return NULL;
1798
1799 return to_net_dev(dev);
1800 }
1801 EXPORT_SYMBOL(of_find_net_device_by_node);
1802 #endif
1803
1804 /* Delete sysfs entries but hold kobject reference until after all
1805 * netdev references are gone.
1806 */
netdev_unregister_kobject(struct net_device * ndev)1807 void netdev_unregister_kobject(struct net_device *ndev)
1808 {
1809 struct device *dev = &ndev->dev;
1810
1811 if (!refcount_read(&dev_net(ndev)->count))
1812 dev_set_uevent_suppress(dev, 1);
1813
1814 kobject_get(&dev->kobj);
1815
1816 remove_queue_kobjects(ndev);
1817
1818 pm_runtime_set_memalloc_noio(dev, false);
1819
1820 device_del(dev);
1821 }
1822
1823 /* Create sysfs entries for network device. */
netdev_register_kobject(struct net_device * ndev)1824 int netdev_register_kobject(struct net_device *ndev)
1825 {
1826 struct device *dev = &ndev->dev;
1827 const struct attribute_group **groups = ndev->sysfs_groups;
1828 int error = 0;
1829
1830 device_initialize(dev);
1831 dev->class = &net_class;
1832 dev->platform_data = ndev;
1833 dev->groups = groups;
1834
1835 dev_set_name(dev, "%s", ndev->name);
1836
1837 #ifdef CONFIG_SYSFS
1838 /* Allow for a device specific group */
1839 if (*groups)
1840 groups++;
1841
1842 *groups++ = &netstat_group;
1843
1844 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1845 if (ndev->ieee80211_ptr)
1846 *groups++ = &wireless_group;
1847 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1848 else if (ndev->wireless_handlers)
1849 *groups++ = &wireless_group;
1850 #endif
1851 #endif
1852 #endif /* CONFIG_SYSFS */
1853
1854 error = device_add(dev);
1855 if (error)
1856 return error;
1857
1858 error = register_queue_kobjects(ndev);
1859 if (error) {
1860 device_del(dev);
1861 return error;
1862 }
1863
1864 pm_runtime_set_memalloc_noio(dev, true);
1865
1866 return error;
1867 }
1868
netdev_class_create_file_ns(const struct class_attribute * class_attr,const void * ns)1869 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1870 const void *ns)
1871 {
1872 return class_create_file_ns(&net_class, class_attr, ns);
1873 }
1874 EXPORT_SYMBOL(netdev_class_create_file_ns);
1875
netdev_class_remove_file_ns(const struct class_attribute * class_attr,const void * ns)1876 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1877 const void *ns)
1878 {
1879 class_remove_file_ns(&net_class, class_attr, ns);
1880 }
1881 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1882
netdev_kobject_init(void)1883 int __init netdev_kobject_init(void)
1884 {
1885 kobj_ns_type_register(&net_ns_type_operations);
1886 return class_register(&net_class);
1887 }
1888