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