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Linux 4.19.133
[linux/fpc-iii.git] / net / core / net-sysfs.c
blob7614a4f42bfc0ffb8e7a8d2f8ba8d18ca3514d43
1 /*
2 * net-sysfs.c - network device class and attributes
3 *
4 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/capability.h>
13 #include <linux/kernel.h>
14 #include <linux/netdevice.h>
15 #include <net/switchdev.h>
16 #include <linux/if_arp.h>
17 #include <linux/slab.h>
18 #include <linux/sched/signal.h>
19 #include <linux/nsproxy.h>
20 #include <net/sock.h>
21 #include <net/net_namespace.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/vmalloc.h>
24 #include <linux/export.h>
25 #include <linux/jiffies.h>
26 #include <linux/pm_runtime.h>
27 #include <linux/of.h>
28 #include <linux/of_net.h>
29 #include <linux/cpu.h>
30
31 #include "net-sysfs.h"
32
33 #ifdef CONFIG_SYSFS
34 static const char fmt_hex[] = "%#x\n";
35 static const char fmt_dec[] = "%d\n";
36 static const char fmt_ulong[] = "%lu\n";
37 static const char fmt_u64[] = "%llu\n";
38
39 static inline int dev_isalive(const struct net_device *dev)
40 {
41 return dev->reg_state <= NETREG_REGISTERED;
42 }
43
44 /* use same locking rules as GIF* ioctl's */
45 static ssize_t netdev_show(const struct device *dev,
46 struct device_attribute *attr, char *buf,
47 ssize_t (*format)(const struct net_device *, char *))
48 {
49 struct net_device *ndev = to_net_dev(dev);
50 ssize_t ret = -EINVAL;
51
52 read_lock(&dev_base_lock);
53 if (dev_isalive(ndev))
54 ret = (*format)(ndev, buf);
55 read_unlock(&dev_base_lock);
56
57 return ret;
58 }
59
60 /* generate a show function for simple field */
61 #define NETDEVICE_SHOW(field, format_string) \
62 static ssize_t format_##field(const struct net_device *dev, char *buf) \
63 { \
64 return sprintf(buf, format_string, dev->field); \
65 } \
66 static ssize_t field##_show(struct device *dev, \
67 struct device_attribute *attr, char *buf) \
68 { \
69 return netdev_show(dev, attr, buf, format_##field); \
70 } \
71
72 #define NETDEVICE_SHOW_RO(field, format_string) \
73 NETDEVICE_SHOW(field, format_string); \
74 static DEVICE_ATTR_RO(field)
75
76 #define NETDEVICE_SHOW_RW(field, format_string) \
77 NETDEVICE_SHOW(field, format_string); \
78 static DEVICE_ATTR_RW(field)
79
80 /* use same locking and permission rules as SIF* ioctl's */
81 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
82 const char *buf, size_t len,
83 int (*set)(struct net_device *, unsigned long))
84 {
85 struct net_device *netdev = to_net_dev(dev);
86 struct net *net = dev_net(netdev);
87 unsigned long new;
88 int ret = -EINVAL;
89
90 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
91 return -EPERM;
92
93 ret = kstrtoul(buf, 0, &new);
94 if (ret)
95 goto err;
96
97 if (!rtnl_trylock())
98 return restart_syscall();
99
100 if (dev_isalive(netdev)) {
101 ret = (*set)(netdev, new);
102 if (ret == 0)
103 ret = len;
104 }
105 rtnl_unlock();
106 err:
107 return ret;
108 }
109
110 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
111 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
112 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
113 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
114 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
115 NETDEVICE_SHOW_RO(type, fmt_dec);
116 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
117
118 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
119 char *buf)
120 {
121 struct net_device *ndev = to_net_dev(dev);
122
123 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
124 }
125 static DEVICE_ATTR_RO(iflink);
126
127 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
128 {
129 return sprintf(buf, fmt_dec, dev->name_assign_type);
130 }
131
132 static ssize_t name_assign_type_show(struct device *dev,
133 struct device_attribute *attr,
134 char *buf)
135 {
136 struct net_device *ndev = to_net_dev(dev);
137 ssize_t ret = -EINVAL;
138
139 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
140 ret = netdev_show(dev, attr, buf, format_name_assign_type);
141
142 return ret;
143 }
144 static DEVICE_ATTR_RO(name_assign_type);
145
146 /* use same locking rules as GIFHWADDR ioctl's */
147 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
148 char *buf)
149 {
150 struct net_device *ndev = to_net_dev(dev);
151 ssize_t ret = -EINVAL;
152
153 read_lock(&dev_base_lock);
154 if (dev_isalive(ndev))
155 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
156 read_unlock(&dev_base_lock);
157 return ret;
158 }
159 static DEVICE_ATTR_RO(address);
160
161 static ssize_t broadcast_show(struct device *dev,
162 struct device_attribute *attr, char *buf)
163 {
164 struct net_device *ndev = to_net_dev(dev);
165
166 if (dev_isalive(ndev))
167 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
168 return -EINVAL;
169 }
170 static DEVICE_ATTR_RO(broadcast);
171
172 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
173 {
174 if (!netif_running(dev))
175 return -EINVAL;
176 return dev_change_carrier(dev, (bool)new_carrier);
177 }
178
179 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
180 const char *buf, size_t len)
181 {
182 return netdev_store(dev, attr, buf, len, change_carrier);
183 }
184
185 static ssize_t carrier_show(struct device *dev,
186 struct device_attribute *attr, char *buf)
187 {
188 struct net_device *netdev = to_net_dev(dev);
189
190 if (netif_running(netdev))
191 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
192
193 return -EINVAL;
194 }
195 static DEVICE_ATTR_RW(carrier);
196
197 static ssize_t speed_show(struct device *dev,
198 struct device_attribute *attr, char *buf)
199 {
200 struct net_device *netdev = to_net_dev(dev);
201 int ret = -EINVAL;
202
203 if (!rtnl_trylock())
204 return restart_syscall();
205
206 if (netif_running(netdev)) {
207 struct ethtool_link_ksettings cmd;
208
209 if (!__ethtool_get_link_ksettings(netdev, &cmd))
210 ret = sprintf(buf, fmt_dec, cmd.base.speed);
211 }
212 rtnl_unlock();
213 return ret;
214 }
215 static DEVICE_ATTR_RO(speed);
216
217 static ssize_t duplex_show(struct device *dev,
218 struct device_attribute *attr, char *buf)
219 {
220 struct net_device *netdev = to_net_dev(dev);
221 int ret = -EINVAL;
222
223 if (!rtnl_trylock())
224 return restart_syscall();
225
226 if (netif_running(netdev)) {
227 struct ethtool_link_ksettings cmd;
228
229 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
230 const char *duplex;
231
232 switch (cmd.base.duplex) {
233 case DUPLEX_HALF:
234 duplex = "half";
235 break;
236 case DUPLEX_FULL:
237 duplex = "full";
238 break;
239 default:
240 duplex = "unknown";
241 break;
242 }
243 ret = sprintf(buf, "%s\n", duplex);
244 }
245 }
246 rtnl_unlock();
247 return ret;
248 }
249 static DEVICE_ATTR_RO(duplex);
250
251 static ssize_t dormant_show(struct device *dev,
252 struct device_attribute *attr, char *buf)
253 {
254 struct net_device *netdev = to_net_dev(dev);
255
256 if (netif_running(netdev))
257 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
258
259 return -EINVAL;
260 }
261 static DEVICE_ATTR_RO(dormant);
262
263 static const char *const operstates[] = {
264 "unknown",
265 "notpresent", /* currently unused */
266 "down",
267 "lowerlayerdown",
268 "testing", /* currently unused */
269 "dormant",
270 "up"
271 };
272
273 static ssize_t operstate_show(struct device *dev,
274 struct device_attribute *attr, char *buf)
275 {
276 const struct net_device *netdev = to_net_dev(dev);
277 unsigned char operstate;
278
279 read_lock(&dev_base_lock);
280 operstate = netdev->operstate;
281 if (!netif_running(netdev))
282 operstate = IF_OPER_DOWN;
283 read_unlock(&dev_base_lock);
284
285 if (operstate >= ARRAY_SIZE(operstates))
286 return -EINVAL; /* should not happen */
287
288 return sprintf(buf, "%s\n", operstates[operstate]);
289 }
290 static DEVICE_ATTR_RO(operstate);
291
292 static ssize_t carrier_changes_show(struct device *dev,
293 struct device_attribute *attr,
294 char *buf)
295 {
296 struct net_device *netdev = to_net_dev(dev);
297
298 return sprintf(buf, fmt_dec,
299 atomic_read(&netdev->carrier_up_count) +
300 atomic_read(&netdev->carrier_down_count));
301 }
302 static DEVICE_ATTR_RO(carrier_changes);
303
304 static ssize_t carrier_up_count_show(struct device *dev,
305 struct device_attribute *attr,
306 char *buf)
307 {
308 struct net_device *netdev = to_net_dev(dev);
309
310 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
311 }
312 static DEVICE_ATTR_RO(carrier_up_count);
313
314 static ssize_t carrier_down_count_show(struct device *dev,
315 struct device_attribute *attr,
316 char *buf)
317 {
318 struct net_device *netdev = to_net_dev(dev);
319
320 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
321 }
322 static DEVICE_ATTR_RO(carrier_down_count);
323
324 /* read-write attributes */
325
326 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
327 {
328 return dev_set_mtu(dev, (int)new_mtu);
329 }
330
331 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
332 const char *buf, size_t len)
333 {
334 return netdev_store(dev, attr, buf, len, change_mtu);
335 }
336 NETDEVICE_SHOW_RW(mtu, fmt_dec);
337
338 static int change_flags(struct net_device *dev, unsigned long new_flags)
339 {
340 return dev_change_flags(dev, (unsigned int)new_flags);
341 }
342
343 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
344 const char *buf, size_t len)
345 {
346 return netdev_store(dev, attr, buf, len, change_flags);
347 }
348 NETDEVICE_SHOW_RW(flags, fmt_hex);
349
350 static ssize_t tx_queue_len_store(struct device *dev,
351 struct device_attribute *attr,
352 const char *buf, size_t len)
353 {
354 if (!capable(CAP_NET_ADMIN))
355 return -EPERM;
356
357 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
358 }
359 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
360
361 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
362 {
363 dev->gro_flush_timeout = val;
364 return 0;
365 }
366
367 static ssize_t gro_flush_timeout_store(struct device *dev,
368 struct device_attribute *attr,
369 const char *buf, size_t len)
370 {
371 if (!capable(CAP_NET_ADMIN))
372 return -EPERM;
373
374 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
375 }
376 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
377
378 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
379 const char *buf, size_t len)
380 {
381 struct net_device *netdev = to_net_dev(dev);
382 struct net *net = dev_net(netdev);
383 size_t count = len;
384 ssize_t ret = 0;
385
386 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
387 return -EPERM;
388
389 /* ignore trailing newline */
390 if (len > 0 && buf[len - 1] == '\n')
391 --count;
392
393 if (!rtnl_trylock())
394 return restart_syscall();
395
396 if (dev_isalive(netdev)) {
397 ret = dev_set_alias(netdev, buf, count);
398 if (ret < 0)
399 goto err;
400 ret = len;
401 netdev_state_change(netdev);
402 }
403 err:
404 rtnl_unlock();
405
406 return ret;
407 }
408
409 static ssize_t ifalias_show(struct device *dev,
410 struct device_attribute *attr, char *buf)
411 {
412 const struct net_device *netdev = to_net_dev(dev);
413 char tmp[IFALIASZ];
414 ssize_t ret = 0;
415
416 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
417 if (ret > 0)
418 ret = sprintf(buf, "%s\n", tmp);
419 return ret;
420 }
421 static DEVICE_ATTR_RW(ifalias);
422
423 static int change_group(struct net_device *dev, unsigned long new_group)
424 {
425 dev_set_group(dev, (int)new_group);
426 return 0;
427 }
428
429 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
430 const char *buf, size_t len)
431 {
432 return netdev_store(dev, attr, buf, len, change_group);
433 }
434 NETDEVICE_SHOW(group, fmt_dec);
435 static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
436
437 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
438 {
439 return dev_change_proto_down(dev, (bool)proto_down);
440 }
441
442 static ssize_t proto_down_store(struct device *dev,
443 struct device_attribute *attr,
444 const char *buf, size_t len)
445 {
446 return netdev_store(dev, attr, buf, len, change_proto_down);
447 }
448 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
449
450 static ssize_t phys_port_id_show(struct device *dev,
451 struct device_attribute *attr, char *buf)
452 {
453 struct net_device *netdev = to_net_dev(dev);
454 ssize_t ret = -EINVAL;
455
456 if (!rtnl_trylock())
457 return restart_syscall();
458
459 if (dev_isalive(netdev)) {
460 struct netdev_phys_item_id ppid;
461
462 ret = dev_get_phys_port_id(netdev, &ppid);
463 if (!ret)
464 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
465 }
466 rtnl_unlock();
467
468 return ret;
469 }
470 static DEVICE_ATTR_RO(phys_port_id);
471
472 static ssize_t phys_port_name_show(struct device *dev,
473 struct device_attribute *attr, char *buf)
474 {
475 struct net_device *netdev = to_net_dev(dev);
476 ssize_t ret = -EINVAL;
477
478 if (!rtnl_trylock())
479 return restart_syscall();
480
481 if (dev_isalive(netdev)) {
482 char name[IFNAMSIZ];
483
484 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
485 if (!ret)
486 ret = sprintf(buf, "%s\n", name);
487 }
488 rtnl_unlock();
489
490 return ret;
491 }
492 static DEVICE_ATTR_RO(phys_port_name);
493
494 static ssize_t phys_switch_id_show(struct device *dev,
495 struct device_attribute *attr, char *buf)
496 {
497 struct net_device *netdev = to_net_dev(dev);
498 ssize_t ret = -EINVAL;
499
500 if (!rtnl_trylock())
501 return restart_syscall();
502
503 if (dev_isalive(netdev)) {
504 struct switchdev_attr attr = {
505 .orig_dev = netdev,
506 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
507 .flags = SWITCHDEV_F_NO_RECURSE,
508 };
509
510 ret = switchdev_port_attr_get(netdev, &attr);
511 if (!ret)
512 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
513 attr.u.ppid.id);
514 }
515 rtnl_unlock();
516
517 return ret;
518 }
519 static DEVICE_ATTR_RO(phys_switch_id);
520
521 static struct attribute *net_class_attrs[] __ro_after_init = {
522 &dev_attr_netdev_group.attr,
523 &dev_attr_type.attr,
524 &dev_attr_dev_id.attr,
525 &dev_attr_dev_port.attr,
526 &dev_attr_iflink.attr,
527 &dev_attr_ifindex.attr,
528 &dev_attr_name_assign_type.attr,
529 &dev_attr_addr_assign_type.attr,
530 &dev_attr_addr_len.attr,
531 &dev_attr_link_mode.attr,
532 &dev_attr_address.attr,
533 &dev_attr_broadcast.attr,
534 &dev_attr_speed.attr,
535 &dev_attr_duplex.attr,
536 &dev_attr_dormant.attr,
537 &dev_attr_operstate.attr,
538 &dev_attr_carrier_changes.attr,
539 &dev_attr_ifalias.attr,
540 &dev_attr_carrier.attr,
541 &dev_attr_mtu.attr,
542 &dev_attr_flags.attr,
543 &dev_attr_tx_queue_len.attr,
544 &dev_attr_gro_flush_timeout.attr,
545 &dev_attr_phys_port_id.attr,
546 &dev_attr_phys_port_name.attr,
547 &dev_attr_phys_switch_id.attr,
548 &dev_attr_proto_down.attr,
549 &dev_attr_carrier_up_count.attr,
550 &dev_attr_carrier_down_count.attr,
551 NULL,
552 };
553 ATTRIBUTE_GROUPS(net_class);
554
555 /* Show a given an attribute in the statistics group */
556 static ssize_t netstat_show(const struct device *d,
557 struct device_attribute *attr, char *buf,
558 unsigned long offset)
559 {
560 struct net_device *dev = to_net_dev(d);
561 ssize_t ret = -EINVAL;
562
563 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
564 offset % sizeof(u64) != 0);
565
566 read_lock(&dev_base_lock);
567 if (dev_isalive(dev)) {
568 struct rtnl_link_stats64 temp;
569 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
570
571 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
572 }
573 read_unlock(&dev_base_lock);
574 return ret;
575 }
576
577 /* generate a read-only statistics attribute */
578 #define NETSTAT_ENTRY(name) \
579 static ssize_t name##_show(struct device *d, \
580 struct device_attribute *attr, char *buf) \
581 { \
582 return netstat_show(d, attr, buf, \
583 offsetof(struct rtnl_link_stats64, name)); \
584 } \
585 static DEVICE_ATTR_RO(name)
586
587 NETSTAT_ENTRY(rx_packets);
588 NETSTAT_ENTRY(tx_packets);
589 NETSTAT_ENTRY(rx_bytes);
590 NETSTAT_ENTRY(tx_bytes);
591 NETSTAT_ENTRY(rx_errors);
592 NETSTAT_ENTRY(tx_errors);
593 NETSTAT_ENTRY(rx_dropped);
594 NETSTAT_ENTRY(tx_dropped);
595 NETSTAT_ENTRY(multicast);
596 NETSTAT_ENTRY(collisions);
597 NETSTAT_ENTRY(rx_length_errors);
598 NETSTAT_ENTRY(rx_over_errors);
599 NETSTAT_ENTRY(rx_crc_errors);
600 NETSTAT_ENTRY(rx_frame_errors);
601 NETSTAT_ENTRY(rx_fifo_errors);
602 NETSTAT_ENTRY(rx_missed_errors);
603 NETSTAT_ENTRY(tx_aborted_errors);
604 NETSTAT_ENTRY(tx_carrier_errors);
605 NETSTAT_ENTRY(tx_fifo_errors);
606 NETSTAT_ENTRY(tx_heartbeat_errors);
607 NETSTAT_ENTRY(tx_window_errors);
608 NETSTAT_ENTRY(rx_compressed);
609 NETSTAT_ENTRY(tx_compressed);
610 NETSTAT_ENTRY(rx_nohandler);
611
612 static struct attribute *netstat_attrs[] __ro_after_init = {
613 &dev_attr_rx_packets.attr,
614 &dev_attr_tx_packets.attr,
615 &dev_attr_rx_bytes.attr,
616 &dev_attr_tx_bytes.attr,
617 &dev_attr_rx_errors.attr,
618 &dev_attr_tx_errors.attr,
619 &dev_attr_rx_dropped.attr,
620 &dev_attr_tx_dropped.attr,
621 &dev_attr_multicast.attr,
622 &dev_attr_collisions.attr,
623 &dev_attr_rx_length_errors.attr,
624 &dev_attr_rx_over_errors.attr,
625 &dev_attr_rx_crc_errors.attr,
626 &dev_attr_rx_frame_errors.attr,
627 &dev_attr_rx_fifo_errors.attr,
628 &dev_attr_rx_missed_errors.attr,
629 &dev_attr_tx_aborted_errors.attr,
630 &dev_attr_tx_carrier_errors.attr,
631 &dev_attr_tx_fifo_errors.attr,
632 &dev_attr_tx_heartbeat_errors.attr,
633 &dev_attr_tx_window_errors.attr,
634 &dev_attr_rx_compressed.attr,
635 &dev_attr_tx_compressed.attr,
636 &dev_attr_rx_nohandler.attr,
637 NULL
638 };
639
640 static const struct attribute_group netstat_group = {
641 .name = "statistics",
642 .attrs = netstat_attrs,
643 };
644
645 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
646 static struct attribute *wireless_attrs[] = {
647 NULL
648 };
649
650 static const struct attribute_group wireless_group = {
651 .name = "wireless",
652 .attrs = wireless_attrs,
653 };
654 #endif
655
656 #else /* CONFIG_SYSFS */
657 #define net_class_groups NULL
658 #endif /* CONFIG_SYSFS */
659
660 #ifdef CONFIG_SYSFS
661 #define to_rx_queue_attr(_attr) \
662 container_of(_attr, struct rx_queue_attribute, attr)
663
664 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
665
666 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
667 char *buf)
668 {
669 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
670 struct netdev_rx_queue *queue = to_rx_queue(kobj);
671
672 if (!attribute->show)
673 return -EIO;
674
675 return attribute->show(queue, buf);
676 }
677
678 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
679 const char *buf, size_t count)
680 {
681 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
682 struct netdev_rx_queue *queue = to_rx_queue(kobj);
683
684 if (!attribute->store)
685 return -EIO;
686
687 return attribute->store(queue, buf, count);
688 }
689
690 static const struct sysfs_ops rx_queue_sysfs_ops = {
691 .show = rx_queue_attr_show,
692 .store = rx_queue_attr_store,
693 };
694
695 #ifdef CONFIG_RPS
696 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
697 {
698 struct rps_map *map;
699 cpumask_var_t mask;
700 int i, len;
701
702 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
703 return -ENOMEM;
704
705 rcu_read_lock();
706 map = rcu_dereference(queue->rps_map);
707 if (map)
708 for (i = 0; i < map->len; i++)
709 cpumask_set_cpu(map->cpus[i], mask);
710
711 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
712 rcu_read_unlock();
713 free_cpumask_var(mask);
714
715 return len < PAGE_SIZE ? len : -EINVAL;
716 }
717
718 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
719 const char *buf, size_t len)
720 {
721 struct rps_map *old_map, *map;
722 cpumask_var_t mask;
723 int err, cpu, i;
724 static DEFINE_MUTEX(rps_map_mutex);
725
726 if (!capable(CAP_NET_ADMIN))
727 return -EPERM;
728
729 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
730 return -ENOMEM;
731
732 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
733 if (err) {
734 free_cpumask_var(mask);
735 return err;
736 }
737
738 map = kzalloc(max_t(unsigned int,
739 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
740 GFP_KERNEL);
741 if (!map) {
742 free_cpumask_var(mask);
743 return -ENOMEM;
744 }
745
746 i = 0;
747 for_each_cpu_and(cpu, mask, cpu_online_mask)
748 map->cpus[i++] = cpu;
749
750 if (i) {
751 map->len = i;
752 } else {
753 kfree(map);
754 map = NULL;
755 }
756
757 mutex_lock(&rps_map_mutex);
758 old_map = rcu_dereference_protected(queue->rps_map,
759 mutex_is_locked(&rps_map_mutex));
760 rcu_assign_pointer(queue->rps_map, map);
761
762 if (map)
763 static_key_slow_inc(&rps_needed);
764 if (old_map)
765 static_key_slow_dec(&rps_needed);
766
767 mutex_unlock(&rps_map_mutex);
768
769 if (old_map)
770 kfree_rcu(old_map, rcu);
771
772 free_cpumask_var(mask);
773 return len;
774 }
775
776 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
777 char *buf)
778 {
779 struct rps_dev_flow_table *flow_table;
780 unsigned long val = 0;
781
782 rcu_read_lock();
783 flow_table = rcu_dereference(queue->rps_flow_table);
784 if (flow_table)
785 val = (unsigned long)flow_table->mask + 1;
786 rcu_read_unlock();
787
788 return sprintf(buf, "%lu\n", val);
789 }
790
791 static void rps_dev_flow_table_release(struct rcu_head *rcu)
792 {
793 struct rps_dev_flow_table *table = container_of(rcu,
794 struct rps_dev_flow_table, rcu);
795 vfree(table);
796 }
797
798 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
799 const char *buf, size_t len)
800 {
801 unsigned long mask, count;
802 struct rps_dev_flow_table *table, *old_table;
803 static DEFINE_SPINLOCK(rps_dev_flow_lock);
804 int rc;
805
806 if (!capable(CAP_NET_ADMIN))
807 return -EPERM;
808
809 rc = kstrtoul(buf, 0, &count);
810 if (rc < 0)
811 return rc;
812
813 if (count) {
814 mask = count - 1;
815 /* mask = roundup_pow_of_two(count) - 1;
816 * without overflows...
817 */
818 while ((mask | (mask >> 1)) != mask)
819 mask |= (mask >> 1);
820 /* On 64 bit arches, must check mask fits in table->mask (u32),
821 * and on 32bit arches, must check
822 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
823 */
824 #if BITS_PER_LONG > 32
825 if (mask > (unsigned long)(u32)mask)
826 return -EINVAL;
827 #else
828 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
829 / sizeof(struct rps_dev_flow)) {
830 /* Enforce a limit to prevent overflow */
831 return -EINVAL;
832 }
833 #endif
834 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
835 if (!table)
836 return -ENOMEM;
837
838 table->mask = mask;
839 for (count = 0; count <= mask; count++)
840 table->flows[count].cpu = RPS_NO_CPU;
841 } else {
842 table = NULL;
843 }
844
845 spin_lock(&rps_dev_flow_lock);
846 old_table = rcu_dereference_protected(queue->rps_flow_table,
847 lockdep_is_held(&rps_dev_flow_lock));
848 rcu_assign_pointer(queue->rps_flow_table, table);
849 spin_unlock(&rps_dev_flow_lock);
850
851 if (old_table)
852 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
853
854 return len;
855 }
856
857 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
858 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
859
860 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
861 = __ATTR(rps_flow_cnt, 0644,
862 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
863 #endif /* CONFIG_RPS */
864
865 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
866 #ifdef CONFIG_RPS
867 &rps_cpus_attribute.attr,
868 &rps_dev_flow_table_cnt_attribute.attr,
869 #endif
870 NULL
871 };
872
873 static void rx_queue_release(struct kobject *kobj)
874 {
875 struct netdev_rx_queue *queue = to_rx_queue(kobj);
876 #ifdef CONFIG_RPS
877 struct rps_map *map;
878 struct rps_dev_flow_table *flow_table;
879
880 map = rcu_dereference_protected(queue->rps_map, 1);
881 if (map) {
882 RCU_INIT_POINTER(queue->rps_map, NULL);
883 kfree_rcu(map, rcu);
884 }
885
886 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
887 if (flow_table) {
888 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
889 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
890 }
891 #endif
892
893 memset(kobj, 0, sizeof(*kobj));
894 dev_put(queue->dev);
895 }
896
897 static const void *rx_queue_namespace(struct kobject *kobj)
898 {
899 struct netdev_rx_queue *queue = to_rx_queue(kobj);
900 struct device *dev = &queue->dev->dev;
901 const void *ns = NULL;
902
903 if (dev->class && dev->class->ns_type)
904 ns = dev->class->namespace(dev);
905
906 return ns;
907 }
908
909 static void rx_queue_get_ownership(struct kobject *kobj,
910 kuid_t *uid, kgid_t *gid)
911 {
912 const struct net *net = rx_queue_namespace(kobj);
913
914 net_ns_get_ownership(net, uid, gid);
915 }
916
917 static struct kobj_type rx_queue_ktype __ro_after_init = {
918 .sysfs_ops = &rx_queue_sysfs_ops,
919 .release = rx_queue_release,
920 .default_attrs = rx_queue_default_attrs,
921 .namespace = rx_queue_namespace,
922 .get_ownership = rx_queue_get_ownership,
923 };
924
925 static int rx_queue_add_kobject(struct net_device *dev, int index)
926 {
927 struct netdev_rx_queue *queue = dev->_rx + index;
928 struct kobject *kobj = &queue->kobj;
929 int error = 0;
930
931 /* Kobject_put later will trigger rx_queue_release call which
932 * decreases dev refcount: Take that reference here
933 */
934 dev_hold(queue->dev);
935
936 kobj->kset = dev->queues_kset;
937 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
938 "rx-%u", index);
939 if (error)
940 goto err;
941
942 if (dev->sysfs_rx_queue_group) {
943 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
944 if (error)
945 goto err;
946 }
947
948 kobject_uevent(kobj, KOBJ_ADD);
949
950 return error;
951
952 err:
953 kobject_put(kobj);
954 return error;
955 }
956 #endif /* CONFIG_SYSFS */
957
958 int
959 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
960 {
961 #ifdef CONFIG_SYSFS
962 int i;
963 int error = 0;
964
965 #ifndef CONFIG_RPS
966 if (!dev->sysfs_rx_queue_group)
967 return 0;
968 #endif
969 for (i = old_num; i < new_num; i++) {
970 error = rx_queue_add_kobject(dev, i);
971 if (error) {
972 new_num = old_num;
973 break;
974 }
975 }
976
977 while (--i >= new_num) {
978 struct kobject *kobj = &dev->_rx[i].kobj;
979
980 if (!refcount_read(&dev_net(dev)->count))
981 kobj->uevent_suppress = 1;
982 if (dev->sysfs_rx_queue_group)
983 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
984 kobject_put(kobj);
985 }
986
987 return error;
988 #else
989 return 0;
990 #endif
991 }
992
993 #ifdef CONFIG_SYSFS
994 /*
995 * netdev_queue sysfs structures and functions.
996 */
997 struct netdev_queue_attribute {
998 struct attribute attr;
999 ssize_t (*show)(struct netdev_queue *queue, char *buf);
1000 ssize_t (*store)(struct netdev_queue *queue,
1001 const char *buf, size_t len);
1002 };
1003 #define to_netdev_queue_attr(_attr) \
1004 container_of(_attr, struct netdev_queue_attribute, attr)
1005
1006 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1007
1008 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1009 struct attribute *attr, char *buf)
1010 {
1011 const struct netdev_queue_attribute *attribute
1012 = to_netdev_queue_attr(attr);
1013 struct netdev_queue *queue = to_netdev_queue(kobj);
1014
1015 if (!attribute->show)
1016 return -EIO;
1017
1018 return attribute->show(queue, buf);
1019 }
1020
1021 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1022 struct attribute *attr,
1023 const char *buf, size_t count)
1024 {
1025 const struct netdev_queue_attribute *attribute
1026 = to_netdev_queue_attr(attr);
1027 struct netdev_queue *queue = to_netdev_queue(kobj);
1028
1029 if (!attribute->store)
1030 return -EIO;
1031
1032 return attribute->store(queue, buf, count);
1033 }
1034
1035 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1036 .show = netdev_queue_attr_show,
1037 .store = netdev_queue_attr_store,
1038 };
1039
1040 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1041 {
1042 unsigned long trans_timeout;
1043
1044 spin_lock_irq(&queue->_xmit_lock);
1045 trans_timeout = queue->trans_timeout;
1046 spin_unlock_irq(&queue->_xmit_lock);
1047
1048 return sprintf(buf, "%lu", trans_timeout);
1049 }
1050
1051 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1052 {
1053 struct net_device *dev = queue->dev;
1054 unsigned int i;
1055
1056 i = queue - dev->_tx;
1057 BUG_ON(i >= dev->num_tx_queues);
1058
1059 return i;
1060 }
1061
1062 static ssize_t traffic_class_show(struct netdev_queue *queue,
1063 char *buf)
1064 {
1065 struct net_device *dev = queue->dev;
1066 int index;
1067 int tc;
1068
1069 if (!netif_is_multiqueue(dev))
1070 return -ENOENT;
1071
1072 index = get_netdev_queue_index(queue);
1073
1074 /* If queue belongs to subordinate dev use its TC mapping */
1075 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1076
1077 tc = netdev_txq_to_tc(dev, index);
1078 if (tc < 0)
1079 return -EINVAL;
1080
1081 /* We can report the traffic class one of two ways:
1082 * Subordinate device traffic classes are reported with the traffic
1083 * class first, and then the subordinate class so for example TC0 on
1084 * subordinate device 2 will be reported as "0-2". If the queue
1085 * belongs to the root device it will be reported with just the
1086 * traffic class, so just "0" for TC 0 for example.
1087 */
1088 return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1089 sprintf(buf, "%u\n", tc);
1090 }
1091
1092 #ifdef CONFIG_XPS
1093 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1094 char *buf)
1095 {
1096 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1097 }
1098
1099 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1100 const char *buf, size_t len)
1101 {
1102 struct net_device *dev = queue->dev;
1103 int err, index = get_netdev_queue_index(queue);
1104 u32 rate = 0;
1105
1106 if (!capable(CAP_NET_ADMIN))
1107 return -EPERM;
1108
1109 err = kstrtou32(buf, 10, &rate);
1110 if (err < 0)
1111 return err;
1112
1113 if (!rtnl_trylock())
1114 return restart_syscall();
1115
1116 err = -EOPNOTSUPP;
1117 if (dev->netdev_ops->ndo_set_tx_maxrate)
1118 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1119
1120 rtnl_unlock();
1121 if (!err) {
1122 queue->tx_maxrate = rate;
1123 return len;
1124 }
1125 return err;
1126 }
1127
1128 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1129 = __ATTR_RW(tx_maxrate);
1130 #endif
1131
1132 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1133 = __ATTR_RO(tx_timeout);
1134
1135 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1136 = __ATTR_RO(traffic_class);
1137
1138 #ifdef CONFIG_BQL
1139 /*
1140 * Byte queue limits sysfs structures and functions.
1141 */
1142 static ssize_t bql_show(char *buf, unsigned int value)
1143 {
1144 return sprintf(buf, "%u\n", value);
1145 }
1146
1147 static ssize_t bql_set(const char *buf, const size_t count,
1148 unsigned int *pvalue)
1149 {
1150 unsigned int value;
1151 int err;
1152
1153 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1154 value = DQL_MAX_LIMIT;
1155 } else {
1156 err = kstrtouint(buf, 10, &value);
1157 if (err < 0)
1158 return err;
1159 if (value > DQL_MAX_LIMIT)
1160 return -EINVAL;
1161 }
1162
1163 *pvalue = value;
1164
1165 return count;
1166 }
1167
1168 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1169 char *buf)
1170 {
1171 struct dql *dql = &queue->dql;
1172
1173 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1174 }
1175
1176 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1177 const char *buf, size_t len)
1178 {
1179 struct dql *dql = &queue->dql;
1180 unsigned int value;
1181 int err;
1182
1183 err = kstrtouint(buf, 10, &value);
1184 if (err < 0)
1185 return err;
1186
1187 dql->slack_hold_time = msecs_to_jiffies(value);
1188
1189 return len;
1190 }
1191
1192 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1193 = __ATTR(hold_time, 0644,
1194 bql_show_hold_time, bql_set_hold_time);
1195
1196 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1197 char *buf)
1198 {
1199 struct dql *dql = &queue->dql;
1200
1201 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1202 }
1203
1204 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1205 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1206
1207 #define BQL_ATTR(NAME, FIELD) \
1208 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1209 char *buf) \
1210 { \
1211 return bql_show(buf, queue->dql.FIELD); \
1212 } \
1213 \
1214 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1215 const char *buf, size_t len) \
1216 { \
1217 return bql_set(buf, len, &queue->dql.FIELD); \
1218 } \
1219 \
1220 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1221 = __ATTR(NAME, 0644, \
1222 bql_show_ ## NAME, bql_set_ ## NAME)
1223
1224 BQL_ATTR(limit, limit);
1225 BQL_ATTR(limit_max, max_limit);
1226 BQL_ATTR(limit_min, min_limit);
1227
1228 static struct attribute *dql_attrs[] __ro_after_init = {
1229 &bql_limit_attribute.attr,
1230 &bql_limit_max_attribute.attr,
1231 &bql_limit_min_attribute.attr,
1232 &bql_hold_time_attribute.attr,
1233 &bql_inflight_attribute.attr,
1234 NULL
1235 };
1236
1237 static const struct attribute_group dql_group = {
1238 .name = "byte_queue_limits",
1239 .attrs = dql_attrs,
1240 };
1241 #endif /* CONFIG_BQL */
1242
1243 #ifdef CONFIG_XPS
1244 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1245 char *buf)
1246 {
1247 struct net_device *dev = queue->dev;
1248 int cpu, len, num_tc = 1, tc = 0;
1249 struct xps_dev_maps *dev_maps;
1250 cpumask_var_t mask;
1251 unsigned long index;
1252
1253 if (!netif_is_multiqueue(dev))
1254 return -ENOENT;
1255
1256 index = get_netdev_queue_index(queue);
1257
1258 if (dev->num_tc) {
1259 /* Do not allow XPS on subordinate device directly */
1260 num_tc = dev->num_tc;
1261 if (num_tc < 0)
1262 return -EINVAL;
1263
1264 /* If queue belongs to subordinate dev use its map */
1265 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1266
1267 tc = netdev_txq_to_tc(dev, index);
1268 if (tc < 0)
1269 return -EINVAL;
1270 }
1271
1272 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1273 return -ENOMEM;
1274
1275 rcu_read_lock();
1276 dev_maps = rcu_dereference(dev->xps_cpus_map);
1277 if (dev_maps) {
1278 for_each_possible_cpu(cpu) {
1279 int i, tci = cpu * num_tc + tc;
1280 struct xps_map *map;
1281
1282 map = rcu_dereference(dev_maps->attr_map[tci]);
1283 if (!map)
1284 continue;
1285
1286 for (i = map->len; i--;) {
1287 if (map->queues[i] == index) {
1288 cpumask_set_cpu(cpu, mask);
1289 break;
1290 }
1291 }
1292 }
1293 }
1294 rcu_read_unlock();
1295
1296 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1297 free_cpumask_var(mask);
1298 return len < PAGE_SIZE ? len : -EINVAL;
1299 }
1300
1301 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1302 const char *buf, size_t len)
1303 {
1304 struct net_device *dev = queue->dev;
1305 unsigned long index;
1306 cpumask_var_t mask;
1307 int err;
1308
1309 if (!netif_is_multiqueue(dev))
1310 return -ENOENT;
1311
1312 if (!capable(CAP_NET_ADMIN))
1313 return -EPERM;
1314
1315 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1316 return -ENOMEM;
1317
1318 index = get_netdev_queue_index(queue);
1319
1320 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1321 if (err) {
1322 free_cpumask_var(mask);
1323 return err;
1324 }
1325
1326 err = netif_set_xps_queue(dev, mask, index);
1327
1328 free_cpumask_var(mask);
1329
1330 return err ? : len;
1331 }
1332
1333 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1334 = __ATTR_RW(xps_cpus);
1335
1336 static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1337 {
1338 struct net_device *dev = queue->dev;
1339 struct xps_dev_maps *dev_maps;
1340 unsigned long *mask, index;
1341 int j, len, num_tc = 1, tc = 0;
1342
1343 index = get_netdev_queue_index(queue);
1344
1345 if (dev->num_tc) {
1346 num_tc = dev->num_tc;
1347 tc = netdev_txq_to_tc(dev, index);
1348 if (tc < 0)
1349 return -EINVAL;
1350 }
1351 mask = kcalloc(BITS_TO_LONGS(dev->num_rx_queues), sizeof(long),
1352 GFP_KERNEL);
1353 if (!mask)
1354 return -ENOMEM;
1355
1356 rcu_read_lock();
1357 dev_maps = rcu_dereference(dev->xps_rxqs_map);
1358 if (!dev_maps)
1359 goto out_no_maps;
1360
1361 for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1362 j < dev->num_rx_queues;) {
1363 int i, tci = j * num_tc + tc;
1364 struct xps_map *map;
1365
1366 map = rcu_dereference(dev_maps->attr_map[tci]);
1367 if (!map)
1368 continue;
1369
1370 for (i = map->len; i--;) {
1371 if (map->queues[i] == index) {
1372 set_bit(j, mask);
1373 break;
1374 }
1375 }
1376 }
1377 out_no_maps:
1378 rcu_read_unlock();
1379
1380 len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1381 kfree(mask);
1382
1383 return len < PAGE_SIZE ? len : -EINVAL;
1384 }
1385
1386 static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1387 size_t len)
1388 {
1389 struct net_device *dev = queue->dev;
1390 struct net *net = dev_net(dev);
1391 unsigned long *mask, index;
1392 int err;
1393
1394 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1395 return -EPERM;
1396
1397 mask = kcalloc(BITS_TO_LONGS(dev->num_rx_queues), sizeof(long),
1398 GFP_KERNEL);
1399 if (!mask)
1400 return -ENOMEM;
1401
1402 index = get_netdev_queue_index(queue);
1403
1404 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1405 if (err) {
1406 kfree(mask);
1407 return err;
1408 }
1409
1410 cpus_read_lock();
1411 err = __netif_set_xps_queue(dev, mask, index, true);
1412 cpus_read_unlock();
1413
1414 kfree(mask);
1415 return err ? : len;
1416 }
1417
1418 static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1419 = __ATTR_RW(xps_rxqs);
1420 #endif /* CONFIG_XPS */
1421
1422 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1423 &queue_trans_timeout.attr,
1424 &queue_traffic_class.attr,
1425 #ifdef CONFIG_XPS
1426 &xps_cpus_attribute.attr,
1427 &xps_rxqs_attribute.attr,
1428 &queue_tx_maxrate.attr,
1429 #endif
1430 NULL
1431 };
1432
1433 static void netdev_queue_release(struct kobject *kobj)
1434 {
1435 struct netdev_queue *queue = to_netdev_queue(kobj);
1436
1437 memset(kobj, 0, sizeof(*kobj));
1438 dev_put(queue->dev);
1439 }
1440
1441 static const void *netdev_queue_namespace(struct kobject *kobj)
1442 {
1443 struct netdev_queue *queue = to_netdev_queue(kobj);
1444 struct device *dev = &queue->dev->dev;
1445 const void *ns = NULL;
1446
1447 if (dev->class && dev->class->ns_type)
1448 ns = dev->class->namespace(dev);
1449
1450 return ns;
1451 }
1452
1453 static void netdev_queue_get_ownership(struct kobject *kobj,
1454 kuid_t *uid, kgid_t *gid)
1455 {
1456 const struct net *net = netdev_queue_namespace(kobj);
1457
1458 net_ns_get_ownership(net, uid, gid);
1459 }
1460
1461 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1462 .sysfs_ops = &netdev_queue_sysfs_ops,
1463 .release = netdev_queue_release,
1464 .default_attrs = netdev_queue_default_attrs,
1465 .namespace = netdev_queue_namespace,
1466 .get_ownership = netdev_queue_get_ownership,
1467 };
1468
1469 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1470 {
1471 struct netdev_queue *queue = dev->_tx + index;
1472 struct kobject *kobj = &queue->kobj;
1473 int error = 0;
1474
1475 /* Kobject_put later will trigger netdev_queue_release call
1476 * which decreases dev refcount: Take that reference here
1477 */
1478 dev_hold(queue->dev);
1479
1480 kobj->kset = dev->queues_kset;
1481 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1482 "tx-%u", index);
1483 if (error)
1484 goto err;
1485
1486 #ifdef CONFIG_BQL
1487 error = sysfs_create_group(kobj, &dql_group);
1488 if (error)
1489 goto err;
1490 #endif
1491
1492 kobject_uevent(kobj, KOBJ_ADD);
1493 return 0;
1494
1495 err:
1496 kobject_put(kobj);
1497 return error;
1498 }
1499 #endif /* CONFIG_SYSFS */
1500
1501 int
1502 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1503 {
1504 #ifdef CONFIG_SYSFS
1505 int i;
1506 int error = 0;
1507
1508 for (i = old_num; i < new_num; i++) {
1509 error = netdev_queue_add_kobject(dev, i);
1510 if (error) {
1511 new_num = old_num;
1512 break;
1513 }
1514 }
1515
1516 while (--i >= new_num) {
1517 struct netdev_queue *queue = dev->_tx + i;
1518
1519 if (!refcount_read(&dev_net(dev)->count))
1520 queue->kobj.uevent_suppress = 1;
1521 #ifdef CONFIG_BQL
1522 sysfs_remove_group(&queue->kobj, &dql_group);
1523 #endif
1524 kobject_put(&queue->kobj);
1525 }
1526
1527 return error;
1528 #else
1529 return 0;
1530 #endif /* CONFIG_SYSFS */
1531 }
1532
1533 static int register_queue_kobjects(struct net_device *dev)
1534 {
1535 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1536
1537 #ifdef CONFIG_SYSFS
1538 dev->queues_kset = kset_create_and_add("queues",
1539 NULL, &dev->dev.kobj);
1540 if (!dev->queues_kset)
1541 return -ENOMEM;
1542 real_rx = dev->real_num_rx_queues;
1543 #endif
1544 real_tx = dev->real_num_tx_queues;
1545
1546 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1547 if (error)
1548 goto error;
1549 rxq = real_rx;
1550
1551 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1552 if (error)
1553 goto error;
1554 txq = real_tx;
1555
1556 return 0;
1557
1558 error:
1559 netdev_queue_update_kobjects(dev, txq, 0);
1560 net_rx_queue_update_kobjects(dev, rxq, 0);
1561 #ifdef CONFIG_SYSFS
1562 kset_unregister(dev->queues_kset);
1563 #endif
1564 return error;
1565 }
1566
1567 static void remove_queue_kobjects(struct net_device *dev)
1568 {
1569 int real_rx = 0, real_tx = 0;
1570
1571 #ifdef CONFIG_SYSFS
1572 real_rx = dev->real_num_rx_queues;
1573 #endif
1574 real_tx = dev->real_num_tx_queues;
1575
1576 net_rx_queue_update_kobjects(dev, real_rx, 0);
1577 netdev_queue_update_kobjects(dev, real_tx, 0);
1578 #ifdef CONFIG_SYSFS
1579 kset_unregister(dev->queues_kset);
1580 #endif
1581 }
1582
1583 static bool net_current_may_mount(void)
1584 {
1585 struct net *net = current->nsproxy->net_ns;
1586
1587 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1588 }
1589
1590 static void *net_grab_current_ns(void)
1591 {
1592 struct net *ns = current->nsproxy->net_ns;
1593 #ifdef CONFIG_NET_NS
1594 if (ns)
1595 refcount_inc(&ns->passive);
1596 #endif
1597 return ns;
1598 }
1599
1600 static const void *net_initial_ns(void)
1601 {
1602 return &init_net;
1603 }
1604
1605 static const void *net_netlink_ns(struct sock *sk)
1606 {
1607 return sock_net(sk);
1608 }
1609
1610 const struct kobj_ns_type_operations net_ns_type_operations = {
1611 .type = KOBJ_NS_TYPE_NET,
1612 .current_may_mount = net_current_may_mount,
1613 .grab_current_ns = net_grab_current_ns,
1614 .netlink_ns = net_netlink_ns,
1615 .initial_ns = net_initial_ns,
1616 .drop_ns = net_drop_ns,
1617 };
1618 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1619
1620 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1621 {
1622 struct net_device *dev = to_net_dev(d);
1623 int retval;
1624
1625 /* pass interface to uevent. */
1626 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1627 if (retval)
1628 goto exit;
1629
1630 /* pass ifindex to uevent.
1631 * ifindex is useful as it won't change (interface name may change)
1632 * and is what RtNetlink uses natively.
1633 */
1634 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1635
1636 exit:
1637 return retval;
1638 }
1639
1640 /*
1641 * netdev_release -- destroy and free a dead device.
1642 * Called when last reference to device kobject is gone.
1643 */
1644 static void netdev_release(struct device *d)
1645 {
1646 struct net_device *dev = to_net_dev(d);
1647
1648 BUG_ON(dev->reg_state != NETREG_RELEASED);
1649
1650 /* no need to wait for rcu grace period:
1651 * device is dead and about to be freed.
1652 */
1653 kfree(rcu_access_pointer(dev->ifalias));
1654 netdev_freemem(dev);
1655 }
1656
1657 static const void *net_namespace(struct device *d)
1658 {
1659 struct net_device *dev = to_net_dev(d);
1660
1661 return dev_net(dev);
1662 }
1663
1664 static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1665 {
1666 struct net_device *dev = to_net_dev(d);
1667 const struct net *net = dev_net(dev);
1668
1669 net_ns_get_ownership(net, uid, gid);
1670 }
1671
1672 static struct class net_class __ro_after_init = {
1673 .name = "net",
1674 .dev_release = netdev_release,
1675 .dev_groups = net_class_groups,
1676 .dev_uevent = netdev_uevent,
1677 .ns_type = &net_ns_type_operations,
1678 .namespace = net_namespace,
1679 .get_ownership = net_get_ownership,
1680 };
1681
1682 #ifdef CONFIG_OF_NET
1683 static int of_dev_node_match(struct device *dev, const void *data)
1684 {
1685 int ret = 0;
1686
1687 if (dev->parent)
1688 ret = dev->parent->of_node == data;
1689
1690 return ret == 0 ? dev->of_node == data : ret;
1691 }
1692
1693 /*
1694 * of_find_net_device_by_node - lookup the net device for the device node
1695 * @np: OF device node
1696 *
1697 * Looks up the net_device structure corresponding with the device node.
1698 * If successful, returns a pointer to the net_device with the embedded
1699 * struct device refcount incremented by one, or NULL on failure. The
1700 * refcount must be dropped when done with the net_device.
1701 */
1702 struct net_device *of_find_net_device_by_node(struct device_node *np)
1703 {
1704 struct device *dev;
1705
1706 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1707 if (!dev)
1708 return NULL;
1709
1710 return to_net_dev(dev);
1711 }
1712 EXPORT_SYMBOL(of_find_net_device_by_node);
1713 #endif
1714
1715 /* Delete sysfs entries but hold kobject reference until after all
1716 * netdev references are gone.
1717 */
1718 void netdev_unregister_kobject(struct net_device *ndev)
1719 {
1720 struct device *dev = &ndev->dev;
1721
1722 if (!refcount_read(&dev_net(ndev)->count))
1723 dev_set_uevent_suppress(dev, 1);
1724
1725 kobject_get(&dev->kobj);
1726
1727 remove_queue_kobjects(ndev);
1728
1729 pm_runtime_set_memalloc_noio(dev, false);
1730
1731 device_del(dev);
1732 }
1733
1734 /* Create sysfs entries for network device. */
1735 int netdev_register_kobject(struct net_device *ndev)
1736 {
1737 struct device *dev = &ndev->dev;
1738 const struct attribute_group **groups = ndev->sysfs_groups;
1739 int error = 0;
1740
1741 device_initialize(dev);
1742 dev->class = &net_class;
1743 dev->platform_data = ndev;
1744 dev->groups = groups;
1745
1746 dev_set_name(dev, "%s", ndev->name);
1747
1748 #ifdef CONFIG_SYSFS
1749 /* Allow for a device specific group */
1750 if (*groups)
1751 groups++;
1752
1753 *groups++ = &netstat_group;
1754
1755 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1756 if (ndev->ieee80211_ptr)
1757 *groups++ = &wireless_group;
1758 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1759 else if (ndev->wireless_handlers)
1760 *groups++ = &wireless_group;
1761 #endif
1762 #endif
1763 #endif /* CONFIG_SYSFS */
1764
1765 error = device_add(dev);
1766 if (error)
1767 return error;
1768
1769 error = register_queue_kobjects(ndev);
1770 if (error) {
1771 device_del(dev);
1772 return error;
1773 }
1774
1775 pm_runtime_set_memalloc_noio(dev, true);
1776
1777 return error;
1778 }
1779
1780 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1781 const void *ns)
1782 {
1783 return class_create_file_ns(&net_class, class_attr, ns);
1784 }
1785 EXPORT_SYMBOL(netdev_class_create_file_ns);
1786
1787 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1788 const void *ns)
1789 {
1790 class_remove_file_ns(&net_class, class_attr, ns);
1791 }
1792 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1793
1794 int __init netdev_kobject_init(void)
1795 {
1796 kobj_ns_type_register(&net_ns_type_operations);
1797 return class_register(&net_class);
1798 }
Linux with added FPC-III support