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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/sched/isolation.h>
15#include <linux/nsproxy.h>
16#include <net/sock.h>
17#include <net/net_namespace.h>
18#include <linux/rtnetlink.h>
19#include <linux/vmalloc.h>
20#include <linux/export.h>
21#include <linux/jiffies.h>
22#include <linux/pm_runtime.h>
23#include <linux/of.h>
24#include <linux/of_net.h>
25#include <linux/cpu.h>
26
27#include "net-sysfs.h"
28
29#ifdef CONFIG_SYSFS
30static const char fmt_hex[] = "%#x\n";
31static const char fmt_dec[] = "%d\n";
32static const char fmt_ulong[] = "%lu\n";
33static const char fmt_u64[] = "%llu\n";
34
35static inline int dev_isalive(const struct net_device *dev)
36{
37 return dev->reg_state <= NETREG_REGISTERED;
38}
39
40/* use same locking rules as GIF* ioctl's */
41static ssize_t netdev_show(const struct device *dev,
42 struct device_attribute *attr, char *buf,
43 ssize_t (*format)(const struct net_device *, char *))
44{
45 struct net_device *ndev = to_net_dev(dev);
46 ssize_t ret = -EINVAL;
47
48 read_lock(&dev_base_lock);
49 if (dev_isalive(ndev))
50 ret = (*format)(ndev, buf);
51 read_unlock(&dev_base_lock);
52
53 return ret;
54}
55
56/* generate a show function for simple field */
57#define NETDEVICE_SHOW(field, format_string) \
58static ssize_t format_##field(const struct net_device *dev, char *buf) \
59{ \
60 return sprintf(buf, format_string, dev->field); \
61} \
62static ssize_t field##_show(struct device *dev, \
63 struct device_attribute *attr, char *buf) \
64{ \
65 return netdev_show(dev, attr, buf, format_##field); \
66} \
67
68#define NETDEVICE_SHOW_RO(field, format_string) \
69NETDEVICE_SHOW(field, format_string); \
70static DEVICE_ATTR_RO(field)
71
72#define NETDEVICE_SHOW_RW(field, format_string) \
73NETDEVICE_SHOW(field, format_string); \
74static DEVICE_ATTR_RW(field)
75
76/* use same locking and permission rules as SIF* ioctl's */
77static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
78 const char *buf, size_t len,
79 int (*set)(struct net_device *, unsigned long))
80{
81 struct net_device *netdev = to_net_dev(dev);
82 struct net *net = dev_net(netdev);
83 unsigned long new;
84 int ret;
85
86 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
87 return -EPERM;
88
89 ret = kstrtoul(buf, 0, &new);
90 if (ret)
91 goto err;
92
93 if (!rtnl_trylock())
94 return restart_syscall();
95
96 if (dev_isalive(netdev)) {
97 ret = (*set)(netdev, new);
98 if (ret == 0)
99 ret = len;
100 }
101 rtnl_unlock();
102 err:
103 return ret;
104}
105
106NETDEVICE_SHOW_RO(dev_id, fmt_hex);
107NETDEVICE_SHOW_RO(dev_port, fmt_dec);
108NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
109NETDEVICE_SHOW_RO(addr_len, fmt_dec);
110NETDEVICE_SHOW_RO(ifindex, fmt_dec);
111NETDEVICE_SHOW_RO(type, fmt_dec);
112NETDEVICE_SHOW_RO(link_mode, fmt_dec);
113
114static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
115 char *buf)
116{
117 struct net_device *ndev = to_net_dev(dev);
118
119 return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
120}
121static DEVICE_ATTR_RO(iflink);
122
123static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
124{
125 return sprintf(buf, fmt_dec, dev->name_assign_type);
126}
127
128static ssize_t name_assign_type_show(struct device *dev,
129 struct device_attribute *attr,
130 char *buf)
131{
132 struct net_device *ndev = to_net_dev(dev);
133 ssize_t ret = -EINVAL;
134
135 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
136 ret = netdev_show(dev, attr, buf, format_name_assign_type);
137
138 return ret;
139}
140static DEVICE_ATTR_RO(name_assign_type);
141
142/* use same locking rules as GIFHWADDR ioctl's */
143static ssize_t address_show(struct device *dev, struct device_attribute *attr,
144 char *buf)
145{
146 struct net_device *ndev = to_net_dev(dev);
147 ssize_t ret = -EINVAL;
148
149 read_lock(&dev_base_lock);
150 if (dev_isalive(ndev))
151 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
152 read_unlock(&dev_base_lock);
153 return ret;
154}
155static DEVICE_ATTR_RO(address);
156
157static ssize_t broadcast_show(struct device *dev,
158 struct device_attribute *attr, char *buf)
159{
160 struct net_device *ndev = to_net_dev(dev);
161
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
186 if (netif_running(netdev))
187 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
188
189 return -EINVAL;
190}
191static DEVICE_ATTR_RW(carrier);
192
193static ssize_t speed_show(struct device *dev,
194 struct device_attribute *attr, char *buf)
195{
196 struct net_device *netdev = to_net_dev(dev);
197 int ret = -EINVAL;
198
199 if (!rtnl_trylock())
200 return restart_syscall();
201
202 if (netif_running(netdev)) {
203 struct ethtool_link_ksettings cmd;
204
205 if (!__ethtool_get_link_ksettings(netdev, &cmd))
206 ret = sprintf(buf, fmt_dec, cmd.base.speed);
207 }
208 rtnl_unlock();
209 return ret;
210}
211static DEVICE_ATTR_RO(speed);
212
213static ssize_t duplex_show(struct device *dev,
214 struct device_attribute *attr, char *buf)
215{
216 struct net_device *netdev = to_net_dev(dev);
217 int ret = -EINVAL;
218
219 if (!rtnl_trylock())
220 return restart_syscall();
221
222 if (netif_running(netdev)) {
223 struct ethtool_link_ksettings cmd;
224
225 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
226 const char *duplex;
227
228 switch (cmd.base.duplex) {
229 case DUPLEX_HALF:
230 duplex = "half";
231 break;
232 case DUPLEX_FULL:
233 duplex = "full";
234 break;
235 default:
236 duplex = "unknown";
237 break;
238 }
239 ret = sprintf(buf, "%s\n", duplex);
240 }
241 }
242 rtnl_unlock();
243 return ret;
244}
245static DEVICE_ATTR_RO(duplex);
246
247static ssize_t testing_show(struct device *dev,
248 struct device_attribute *attr, char *buf)
249{
250 struct net_device *netdev = to_net_dev(dev);
251
252 if (netif_running(netdev))
253 return sprintf(buf, fmt_dec, !!netif_testing(netdev));
254
255 return -EINVAL;
256}
257static DEVICE_ATTR_RO(testing);
258
259static ssize_t dormant_show(struct device *dev,
260 struct device_attribute *attr, char *buf)
261{
262 struct net_device *netdev = to_net_dev(dev);
263
264 if (netif_running(netdev))
265 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
266
267 return -EINVAL;
268}
269static DEVICE_ATTR_RO(dormant);
270
271static const char *const operstates[] = {
272 "unknown",
273 "notpresent", /* currently unused */
274 "down",
275 "lowerlayerdown",
276 "testing",
277 "dormant",
278 "up"
279};
280
281static ssize_t operstate_show(struct device *dev,
282 struct device_attribute *attr, char *buf)
283{
284 const struct net_device *netdev = to_net_dev(dev);
285 unsigned char operstate;
286
287 read_lock(&dev_base_lock);
288 operstate = netdev->operstate;
289 if (!netif_running(netdev))
290 operstate = IF_OPER_DOWN;
291 read_unlock(&dev_base_lock);
292
293 if (operstate >= ARRAY_SIZE(operstates))
294 return -EINVAL; /* should not happen */
295
296 return sprintf(buf, "%s\n", operstates[operstate]);
297}
298static DEVICE_ATTR_RO(operstate);
299
300static ssize_t carrier_changes_show(struct device *dev,
301 struct device_attribute *attr,
302 char *buf)
303{
304 struct net_device *netdev = to_net_dev(dev);
305
306 return sprintf(buf, fmt_dec,
307 atomic_read(&netdev->carrier_up_count) +
308 atomic_read(&netdev->carrier_down_count));
309}
310static DEVICE_ATTR_RO(carrier_changes);
311
312static ssize_t carrier_up_count_show(struct device *dev,
313 struct device_attribute *attr,
314 char *buf)
315{
316 struct net_device *netdev = to_net_dev(dev);
317
318 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
319}
320static DEVICE_ATTR_RO(carrier_up_count);
321
322static ssize_t carrier_down_count_show(struct device *dev,
323 struct device_attribute *attr,
324 char *buf)
325{
326 struct net_device *netdev = to_net_dev(dev);
327
328 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
329}
330static DEVICE_ATTR_RO(carrier_down_count);
331
332/* read-write attributes */
333
334static int change_mtu(struct net_device *dev, unsigned long new_mtu)
335{
336 return dev_set_mtu(dev, (int)new_mtu);
337}
338
339static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
340 const char *buf, size_t len)
341{
342 return netdev_store(dev, attr, buf, len, change_mtu);
343}
344NETDEVICE_SHOW_RW(mtu, fmt_dec);
345
346static int change_flags(struct net_device *dev, unsigned long new_flags)
347{
348 return dev_change_flags(dev, (unsigned int)new_flags, NULL);
349}
350
351static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
352 const char *buf, size_t len)
353{
354 return netdev_store(dev, attr, buf, len, change_flags);
355}
356NETDEVICE_SHOW_RW(flags, fmt_hex);
357
358static ssize_t tx_queue_len_store(struct device *dev,
359 struct device_attribute *attr,
360 const char *buf, size_t len)
361{
362 if (!capable(CAP_NET_ADMIN))
363 return -EPERM;
364
365 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
366}
367NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
368
369static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
370{
371 WRITE_ONCE(dev->gro_flush_timeout, val);
372 return 0;
373}
374
375static ssize_t gro_flush_timeout_store(struct device *dev,
376 struct device_attribute *attr,
377 const char *buf, size_t len)
378{
379 if (!capable(CAP_NET_ADMIN))
380 return -EPERM;
381
382 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
383}
384NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
385
386static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val)
387{
388 WRITE_ONCE(dev->napi_defer_hard_irqs, val);
389 return 0;
390}
391
392static ssize_t napi_defer_hard_irqs_store(struct device *dev,
393 struct device_attribute *attr,
394 const char *buf, size_t len)
395{
396 if (!capable(CAP_NET_ADMIN))
397 return -EPERM;
398
399 return netdev_store(dev, attr, buf, len, change_napi_defer_hard_irqs);
400}
401NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_dec);
402
403static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
404 const char *buf, size_t len)
405{
406 struct net_device *netdev = to_net_dev(dev);
407 struct net *net = dev_net(netdev);
408 size_t count = len;
409 ssize_t ret = 0;
410
411 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
412 return -EPERM;
413
414 /* ignore trailing newline */
415 if (len > 0 && buf[len - 1] == '\n')
416 --count;
417
418 if (!rtnl_trylock())
419 return restart_syscall();
420
421 if (dev_isalive(netdev)) {
422 ret = dev_set_alias(netdev, buf, count);
423 if (ret < 0)
424 goto err;
425 ret = len;
426 netdev_state_change(netdev);
427 }
428err:
429 rtnl_unlock();
430
431 return ret;
432}
433
434static ssize_t ifalias_show(struct device *dev,
435 struct device_attribute *attr, char *buf)
436{
437 const struct net_device *netdev = to_net_dev(dev);
438 char tmp[IFALIASZ];
439 ssize_t ret = 0;
440
441 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
442 if (ret > 0)
443 ret = sprintf(buf, "%s\n", tmp);
444 return ret;
445}
446static DEVICE_ATTR_RW(ifalias);
447
448static int change_group(struct net_device *dev, unsigned long new_group)
449{
450 dev_set_group(dev, (int)new_group);
451 return 0;
452}
453
454static ssize_t group_store(struct device *dev, struct device_attribute *attr,
455 const char *buf, size_t len)
456{
457 return netdev_store(dev, attr, buf, len, change_group);
458}
459NETDEVICE_SHOW(group, fmt_dec);
460static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
461
462static int change_proto_down(struct net_device *dev, unsigned long proto_down)
463{
464 return dev_change_proto_down(dev, (bool)proto_down);
465}
466
467static ssize_t proto_down_store(struct device *dev,
468 struct device_attribute *attr,
469 const char *buf, size_t len)
470{
471 return netdev_store(dev, attr, buf, len, change_proto_down);
472}
473NETDEVICE_SHOW_RW(proto_down, fmt_dec);
474
475static ssize_t phys_port_id_show(struct device *dev,
476 struct device_attribute *attr, char *buf)
477{
478 struct net_device *netdev = to_net_dev(dev);
479 ssize_t ret = -EINVAL;
480
481 if (!rtnl_trylock())
482 return restart_syscall();
483
484 if (dev_isalive(netdev)) {
485 struct netdev_phys_item_id ppid;
486
487 ret = dev_get_phys_port_id(netdev, &ppid);
488 if (!ret)
489 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
490 }
491 rtnl_unlock();
492
493 return ret;
494}
495static DEVICE_ATTR_RO(phys_port_id);
496
497static ssize_t phys_port_name_show(struct device *dev,
498 struct device_attribute *attr, char *buf)
499{
500 struct net_device *netdev = to_net_dev(dev);
501 ssize_t ret = -EINVAL;
502
503 if (!rtnl_trylock())
504 return restart_syscall();
505
506 if (dev_isalive(netdev)) {
507 char name[IFNAMSIZ];
508
509 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
510 if (!ret)
511 ret = sprintf(buf, "%s\n", name);
512 }
513 rtnl_unlock();
514
515 return ret;
516}
517static DEVICE_ATTR_RO(phys_port_name);
518
519static ssize_t phys_switch_id_show(struct device *dev,
520 struct device_attribute *attr, char *buf)
521{
522 struct net_device *netdev = to_net_dev(dev);
523 ssize_t ret = -EINVAL;
524
525 if (!rtnl_trylock())
526 return restart_syscall();
527
528 if (dev_isalive(netdev)) {
529 struct netdev_phys_item_id ppid = { };
530
531 ret = dev_get_port_parent_id(netdev, &ppid, false);
532 if (!ret)
533 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
534 }
535 rtnl_unlock();
536
537 return ret;
538}
539static DEVICE_ATTR_RO(phys_switch_id);
540
541static ssize_t threaded_show(struct device *dev,
542 struct device_attribute *attr, char *buf)
543{
544 struct net_device *netdev = to_net_dev(dev);
545 ssize_t ret = -EINVAL;
546
547 if (!rtnl_trylock())
548 return restart_syscall();
549
550 if (dev_isalive(netdev))
551 ret = sprintf(buf, fmt_dec, netdev->threaded);
552
553 rtnl_unlock();
554 return ret;
555}
556
557static int modify_napi_threaded(struct net_device *dev, unsigned long val)
558{
559 int ret;
560
561 if (list_empty(&dev->napi_list))
562 return -EOPNOTSUPP;
563
564 if (val != 0 && val != 1)
565 return -EOPNOTSUPP;
566
567 ret = dev_set_threaded(dev, val);
568
569 return ret;
570}
571
572static ssize_t threaded_store(struct device *dev,
573 struct device_attribute *attr,
574 const char *buf, size_t len)
575{
576 return netdev_store(dev, attr, buf, len, modify_napi_threaded);
577}
578static DEVICE_ATTR_RW(threaded);
579
580static struct attribute *net_class_attrs[] __ro_after_init = {
581 &dev_attr_netdev_group.attr,
582 &dev_attr_type.attr,
583 &dev_attr_dev_id.attr,
584 &dev_attr_dev_port.attr,
585 &dev_attr_iflink.attr,
586 &dev_attr_ifindex.attr,
587 &dev_attr_name_assign_type.attr,
588 &dev_attr_addr_assign_type.attr,
589 &dev_attr_addr_len.attr,
590 &dev_attr_link_mode.attr,
591 &dev_attr_address.attr,
592 &dev_attr_broadcast.attr,
593 &dev_attr_speed.attr,
594 &dev_attr_duplex.attr,
595 &dev_attr_dormant.attr,
596 &dev_attr_testing.attr,
597 &dev_attr_operstate.attr,
598 &dev_attr_carrier_changes.attr,
599 &dev_attr_ifalias.attr,
600 &dev_attr_carrier.attr,
601 &dev_attr_mtu.attr,
602 &dev_attr_flags.attr,
603 &dev_attr_tx_queue_len.attr,
604 &dev_attr_gro_flush_timeout.attr,
605 &dev_attr_napi_defer_hard_irqs.attr,
606 &dev_attr_phys_port_id.attr,
607 &dev_attr_phys_port_name.attr,
608 &dev_attr_phys_switch_id.attr,
609 &dev_attr_proto_down.attr,
610 &dev_attr_carrier_up_count.attr,
611 &dev_attr_carrier_down_count.attr,
612 &dev_attr_threaded.attr,
613 NULL,
614};
615ATTRIBUTE_GROUPS(net_class);
616
617/* Show a given an attribute in the statistics group */
618static ssize_t netstat_show(const struct device *d,
619 struct device_attribute *attr, char *buf,
620 unsigned long offset)
621{
622 struct net_device *dev = to_net_dev(d);
623 ssize_t ret = -EINVAL;
624
625 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
626 offset % sizeof(u64) != 0);
627
628 read_lock(&dev_base_lock);
629 if (dev_isalive(dev)) {
630 struct rtnl_link_stats64 temp;
631 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
632
633 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
634 }
635 read_unlock(&dev_base_lock);
636 return ret;
637}
638
639/* generate a read-only statistics attribute */
640#define NETSTAT_ENTRY(name) \
641static ssize_t name##_show(struct device *d, \
642 struct device_attribute *attr, char *buf) \
643{ \
644 return netstat_show(d, attr, buf, \
645 offsetof(struct rtnl_link_stats64, name)); \
646} \
647static DEVICE_ATTR_RO(name)
648
649NETSTAT_ENTRY(rx_packets);
650NETSTAT_ENTRY(tx_packets);
651NETSTAT_ENTRY(rx_bytes);
652NETSTAT_ENTRY(tx_bytes);
653NETSTAT_ENTRY(rx_errors);
654NETSTAT_ENTRY(tx_errors);
655NETSTAT_ENTRY(rx_dropped);
656NETSTAT_ENTRY(tx_dropped);
657NETSTAT_ENTRY(multicast);
658NETSTAT_ENTRY(collisions);
659NETSTAT_ENTRY(rx_length_errors);
660NETSTAT_ENTRY(rx_over_errors);
661NETSTAT_ENTRY(rx_crc_errors);
662NETSTAT_ENTRY(rx_frame_errors);
663NETSTAT_ENTRY(rx_fifo_errors);
664NETSTAT_ENTRY(rx_missed_errors);
665NETSTAT_ENTRY(tx_aborted_errors);
666NETSTAT_ENTRY(tx_carrier_errors);
667NETSTAT_ENTRY(tx_fifo_errors);
668NETSTAT_ENTRY(tx_heartbeat_errors);
669NETSTAT_ENTRY(tx_window_errors);
670NETSTAT_ENTRY(rx_compressed);
671NETSTAT_ENTRY(tx_compressed);
672NETSTAT_ENTRY(rx_nohandler);
673
674static struct attribute *netstat_attrs[] __ro_after_init = {
675 &dev_attr_rx_packets.attr,
676 &dev_attr_tx_packets.attr,
677 &dev_attr_rx_bytes.attr,
678 &dev_attr_tx_bytes.attr,
679 &dev_attr_rx_errors.attr,
680 &dev_attr_tx_errors.attr,
681 &dev_attr_rx_dropped.attr,
682 &dev_attr_tx_dropped.attr,
683 &dev_attr_multicast.attr,
684 &dev_attr_collisions.attr,
685 &dev_attr_rx_length_errors.attr,
686 &dev_attr_rx_over_errors.attr,
687 &dev_attr_rx_crc_errors.attr,
688 &dev_attr_rx_frame_errors.attr,
689 &dev_attr_rx_fifo_errors.attr,
690 &dev_attr_rx_missed_errors.attr,
691 &dev_attr_tx_aborted_errors.attr,
692 &dev_attr_tx_carrier_errors.attr,
693 &dev_attr_tx_fifo_errors.attr,
694 &dev_attr_tx_heartbeat_errors.attr,
695 &dev_attr_tx_window_errors.attr,
696 &dev_attr_rx_compressed.attr,
697 &dev_attr_tx_compressed.attr,
698 &dev_attr_rx_nohandler.attr,
699 NULL
700};
701
702static const struct attribute_group netstat_group = {
703 .name = "statistics",
704 .attrs = netstat_attrs,
705};
706
707#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
708static struct attribute *wireless_attrs[] = {
709 NULL
710};
711
712static const struct attribute_group wireless_group = {
713 .name = "wireless",
714 .attrs = wireless_attrs,
715};
716#endif
717
718#else /* CONFIG_SYSFS */
719#define net_class_groups NULL
720#endif /* CONFIG_SYSFS */
721
722#ifdef CONFIG_SYSFS
723#define to_rx_queue_attr(_attr) \
724 container_of(_attr, struct rx_queue_attribute, attr)
725
726#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
727
728static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
729 char *buf)
730{
731 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
732 struct netdev_rx_queue *queue = to_rx_queue(kobj);
733
734 if (!attribute->show)
735 return -EIO;
736
737 return attribute->show(queue, buf);
738}
739
740static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
741 const char *buf, size_t count)
742{
743 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
744 struct netdev_rx_queue *queue = to_rx_queue(kobj);
745
746 if (!attribute->store)
747 return -EIO;
748
749 return attribute->store(queue, buf, count);
750}
751
752static const struct sysfs_ops rx_queue_sysfs_ops = {
753 .show = rx_queue_attr_show,
754 .store = rx_queue_attr_store,
755};
756
757#ifdef CONFIG_RPS
758static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
759{
760 struct rps_map *map;
761 cpumask_var_t mask;
762 int i, len;
763
764 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
765 return -ENOMEM;
766
767 rcu_read_lock();
768 map = rcu_dereference(queue->rps_map);
769 if (map)
770 for (i = 0; i < map->len; i++)
771 cpumask_set_cpu(map->cpus[i], mask);
772
773 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
774 rcu_read_unlock();
775 free_cpumask_var(mask);
776
777 return len < PAGE_SIZE ? len : -EINVAL;
778}
779
780static ssize_t store_rps_map(struct netdev_rx_queue *queue,
781 const char *buf, size_t len)
782{
783 struct rps_map *old_map, *map;
784 cpumask_var_t mask;
785 int err, cpu, i, hk_flags;
786 static DEFINE_MUTEX(rps_map_mutex);
787
788 if (!capable(CAP_NET_ADMIN))
789 return -EPERM;
790
791 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
792 return -ENOMEM;
793
794 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
795 if (err) {
796 free_cpumask_var(mask);
797 return err;
798 }
799
800 if (!cpumask_empty(mask)) {
801 hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ;
802 cpumask_and(mask, mask, housekeeping_cpumask(hk_flags));
803 if (cpumask_empty(mask)) {
804 free_cpumask_var(mask);
805 return -EINVAL;
806 }
807 }
808
809 map = kzalloc(max_t(unsigned int,
810 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
811 GFP_KERNEL);
812 if (!map) {
813 free_cpumask_var(mask);
814 return -ENOMEM;
815 }
816
817 i = 0;
818 for_each_cpu_and(cpu, mask, cpu_online_mask)
819 map->cpus[i++] = cpu;
820
821 if (i) {
822 map->len = i;
823 } else {
824 kfree(map);
825 map = NULL;
826 }
827
828 mutex_lock(&rps_map_mutex);
829 old_map = rcu_dereference_protected(queue->rps_map,
830 mutex_is_locked(&rps_map_mutex));
831 rcu_assign_pointer(queue->rps_map, map);
832
833 if (map)
834 static_branch_inc(&rps_needed);
835 if (old_map)
836 static_branch_dec(&rps_needed);
837
838 mutex_unlock(&rps_map_mutex);
839
840 if (old_map)
841 kfree_rcu(old_map, rcu);
842
843 free_cpumask_var(mask);
844 return len;
845}
846
847static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
848 char *buf)
849{
850 struct rps_dev_flow_table *flow_table;
851 unsigned long val = 0;
852
853 rcu_read_lock();
854 flow_table = rcu_dereference(queue->rps_flow_table);
855 if (flow_table)
856 val = (unsigned long)flow_table->mask + 1;
857 rcu_read_unlock();
858
859 return sprintf(buf, "%lu\n", val);
860}
861
862static void rps_dev_flow_table_release(struct rcu_head *rcu)
863{
864 struct rps_dev_flow_table *table = container_of(rcu,
865 struct rps_dev_flow_table, rcu);
866 vfree(table);
867}
868
869static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
870 const char *buf, size_t len)
871{
872 unsigned long mask, count;
873 struct rps_dev_flow_table *table, *old_table;
874 static DEFINE_SPINLOCK(rps_dev_flow_lock);
875 int rc;
876
877 if (!capable(CAP_NET_ADMIN))
878 return -EPERM;
879
880 rc = kstrtoul(buf, 0, &count);
881 if (rc < 0)
882 return rc;
883
884 if (count) {
885 mask = count - 1;
886 /* mask = roundup_pow_of_two(count) - 1;
887 * without overflows...
888 */
889 while ((mask | (mask >> 1)) != mask)
890 mask |= (mask >> 1);
891 /* On 64 bit arches, must check mask fits in table->mask (u32),
892 * and on 32bit arches, must check
893 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
894 */
895#if BITS_PER_LONG > 32
896 if (mask > (unsigned long)(u32)mask)
897 return -EINVAL;
898#else
899 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
900 / sizeof(struct rps_dev_flow)) {
901 /* Enforce a limit to prevent overflow */
902 return -EINVAL;
903 }
904#endif
905 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
906 if (!table)
907 return -ENOMEM;
908
909 table->mask = mask;
910 for (count = 0; count <= mask; count++)
911 table->flows[count].cpu = RPS_NO_CPU;
912 } else {
913 table = NULL;
914 }
915
916 spin_lock(&rps_dev_flow_lock);
917 old_table = rcu_dereference_protected(queue->rps_flow_table,
918 lockdep_is_held(&rps_dev_flow_lock));
919 rcu_assign_pointer(queue->rps_flow_table, table);
920 spin_unlock(&rps_dev_flow_lock);
921
922 if (old_table)
923 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
924
925 return len;
926}
927
928static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
929 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
930
931static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
932 = __ATTR(rps_flow_cnt, 0644,
933 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
934#endif /* CONFIG_RPS */
935
936static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
937#ifdef CONFIG_RPS
938 &rps_cpus_attribute.attr,
939 &rps_dev_flow_table_cnt_attribute.attr,
940#endif
941 NULL
942};
943ATTRIBUTE_GROUPS(rx_queue_default);
944
945static void rx_queue_release(struct kobject *kobj)
946{
947 struct netdev_rx_queue *queue = to_rx_queue(kobj);
948#ifdef CONFIG_RPS
949 struct rps_map *map;
950 struct rps_dev_flow_table *flow_table;
951
952 map = rcu_dereference_protected(queue->rps_map, 1);
953 if (map) {
954 RCU_INIT_POINTER(queue->rps_map, NULL);
955 kfree_rcu(map, rcu);
956 }
957
958 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
959 if (flow_table) {
960 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
961 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
962 }
963#endif
964
965 memset(kobj, 0, sizeof(*kobj));
966 dev_put(queue->dev);
967}
968
969static const void *rx_queue_namespace(struct kobject *kobj)
970{
971 struct netdev_rx_queue *queue = to_rx_queue(kobj);
972 struct device *dev = &queue->dev->dev;
973 const void *ns = NULL;
974
975 if (dev->class && dev->class->ns_type)
976 ns = dev->class->namespace(dev);
977
978 return ns;
979}
980
981static void rx_queue_get_ownership(struct kobject *kobj,
982 kuid_t *uid, kgid_t *gid)
983{
984 const struct net *net = rx_queue_namespace(kobj);
985
986 net_ns_get_ownership(net, uid, gid);
987}
988
989static struct kobj_type rx_queue_ktype __ro_after_init = {
990 .sysfs_ops = &rx_queue_sysfs_ops,
991 .release = rx_queue_release,
992 .default_groups = rx_queue_default_groups,
993 .namespace = rx_queue_namespace,
994 .get_ownership = rx_queue_get_ownership,
995};
996
997static int rx_queue_add_kobject(struct net_device *dev, int index)
998{
999 struct netdev_rx_queue *queue = dev->_rx + index;
1000 struct kobject *kobj = &queue->kobj;
1001 int error = 0;
1002
1003 /* Kobject_put later will trigger rx_queue_release call which
1004 * decreases dev refcount: Take that reference here
1005 */
1006 dev_hold(queue->dev);
1007
1008 kobj->kset = dev->queues_kset;
1009 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
1010 "rx-%u", index);
1011 if (error)
1012 goto err;
1013
1014 if (dev->sysfs_rx_queue_group) {
1015 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
1016 if (error)
1017 goto err;
1018 }
1019
1020 kobject_uevent(kobj, KOBJ_ADD);
1021
1022 return error;
1023
1024err:
1025 kobject_put(kobj);
1026 return error;
1027}
1028
1029static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
1030 kgid_t kgid)
1031{
1032 struct netdev_rx_queue *queue = dev->_rx + index;
1033 struct kobject *kobj = &queue->kobj;
1034 int error;
1035
1036 error = sysfs_change_owner(kobj, kuid, kgid);
1037 if (error)
1038 return error;
1039
1040 if (dev->sysfs_rx_queue_group)
1041 error = sysfs_group_change_owner(
1042 kobj, dev->sysfs_rx_queue_group, kuid, kgid);
1043
1044 return error;
1045}
1046#endif /* CONFIG_SYSFS */
1047
1048int
1049net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1050{
1051#ifdef CONFIG_SYSFS
1052 int i;
1053 int error = 0;
1054
1055#ifndef CONFIG_RPS
1056 if (!dev->sysfs_rx_queue_group)
1057 return 0;
1058#endif
1059 for (i = old_num; i < new_num; i++) {
1060 error = rx_queue_add_kobject(dev, i);
1061 if (error) {
1062 new_num = old_num;
1063 break;
1064 }
1065 }
1066
1067 while (--i >= new_num) {
1068 struct kobject *kobj = &dev->_rx[i].kobj;
1069
1070 if (!refcount_read(&dev_net(dev)->ns.count))
1071 kobj->uevent_suppress = 1;
1072 if (dev->sysfs_rx_queue_group)
1073 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
1074 kobject_put(kobj);
1075 }
1076
1077 return error;
1078#else
1079 return 0;
1080#endif
1081}
1082
1083static int net_rx_queue_change_owner(struct net_device *dev, int num,
1084 kuid_t kuid, kgid_t kgid)
1085{
1086#ifdef CONFIG_SYSFS
1087 int error = 0;
1088 int i;
1089
1090#ifndef CONFIG_RPS
1091 if (!dev->sysfs_rx_queue_group)
1092 return 0;
1093#endif
1094 for (i = 0; i < num; i++) {
1095 error = rx_queue_change_owner(dev, i, kuid, kgid);
1096 if (error)
1097 break;
1098 }
1099
1100 return error;
1101#else
1102 return 0;
1103#endif
1104}
1105
1106#ifdef CONFIG_SYSFS
1107/*
1108 * netdev_queue sysfs structures and functions.
1109 */
1110struct netdev_queue_attribute {
1111 struct attribute attr;
1112 ssize_t (*show)(struct netdev_queue *queue, char *buf);
1113 ssize_t (*store)(struct netdev_queue *queue,
1114 const char *buf, size_t len);
1115};
1116#define to_netdev_queue_attr(_attr) \
1117 container_of(_attr, struct netdev_queue_attribute, attr)
1118
1119#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1120
1121static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1122 struct attribute *attr, char *buf)
1123{
1124 const struct netdev_queue_attribute *attribute
1125 = to_netdev_queue_attr(attr);
1126 struct netdev_queue *queue = to_netdev_queue(kobj);
1127
1128 if (!attribute->show)
1129 return -EIO;
1130
1131 return attribute->show(queue, buf);
1132}
1133
1134static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1135 struct attribute *attr,
1136 const char *buf, size_t count)
1137{
1138 const struct netdev_queue_attribute *attribute
1139 = to_netdev_queue_attr(attr);
1140 struct netdev_queue *queue = to_netdev_queue(kobj);
1141
1142 if (!attribute->store)
1143 return -EIO;
1144
1145 return attribute->store(queue, buf, count);
1146}
1147
1148static const struct sysfs_ops netdev_queue_sysfs_ops = {
1149 .show = netdev_queue_attr_show,
1150 .store = netdev_queue_attr_store,
1151};
1152
1153static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1154{
1155 unsigned long trans_timeout;
1156
1157 spin_lock_irq(&queue->_xmit_lock);
1158 trans_timeout = queue->trans_timeout;
1159 spin_unlock_irq(&queue->_xmit_lock);
1160
1161 return sprintf(buf, fmt_ulong, trans_timeout);
1162}
1163
1164static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1165{
1166 struct net_device *dev = queue->dev;
1167 unsigned int i;
1168
1169 i = queue - dev->_tx;
1170 BUG_ON(i >= dev->num_tx_queues);
1171
1172 return i;
1173}
1174
1175static ssize_t traffic_class_show(struct netdev_queue *queue,
1176 char *buf)
1177{
1178 struct net_device *dev = queue->dev;
1179 int num_tc, tc;
1180 int index;
1181
1182 if (!netif_is_multiqueue(dev))
1183 return -ENOENT;
1184
1185 if (!rtnl_trylock())
1186 return restart_syscall();
1187
1188 index = get_netdev_queue_index(queue);
1189
1190 /* If queue belongs to subordinate dev use its TC mapping */
1191 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1192
1193 num_tc = dev->num_tc;
1194 tc = netdev_txq_to_tc(dev, index);
1195
1196 rtnl_unlock();
1197
1198 if (tc < 0)
1199 return -EINVAL;
1200
1201 /* We can report the traffic class one of two ways:
1202 * Subordinate device traffic classes are reported with the traffic
1203 * class first, and then the subordinate class so for example TC0 on
1204 * subordinate device 2 will be reported as "0-2". If the queue
1205 * belongs to the root device it will be reported with just the
1206 * traffic class, so just "0" for TC 0 for example.
1207 */
1208 return num_tc < 0 ? sprintf(buf, "%d%d\n", tc, num_tc) :
1209 sprintf(buf, "%d\n", tc);
1210}
1211
1212#ifdef CONFIG_XPS
1213static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1214 char *buf)
1215{
1216 return sprintf(buf, "%lu\n", queue->tx_maxrate);
1217}
1218
1219static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1220 const char *buf, size_t len)
1221{
1222 struct net_device *dev = queue->dev;
1223 int err, index = get_netdev_queue_index(queue);
1224 u32 rate = 0;
1225
1226 if (!capable(CAP_NET_ADMIN))
1227 return -EPERM;
1228
1229 err = kstrtou32(buf, 10, &rate);
1230 if (err < 0)
1231 return err;
1232
1233 if (!rtnl_trylock())
1234 return restart_syscall();
1235
1236 err = -EOPNOTSUPP;
1237 if (dev->netdev_ops->ndo_set_tx_maxrate)
1238 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1239
1240 rtnl_unlock();
1241 if (!err) {
1242 queue->tx_maxrate = rate;
1243 return len;
1244 }
1245 return err;
1246}
1247
1248static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1249 = __ATTR_RW(tx_maxrate);
1250#endif
1251
1252static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1253 = __ATTR_RO(tx_timeout);
1254
1255static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1256 = __ATTR_RO(traffic_class);
1257
1258#ifdef CONFIG_BQL
1259/*
1260 * Byte queue limits sysfs structures and functions.
1261 */
1262static ssize_t bql_show(char *buf, unsigned int value)
1263{
1264 return sprintf(buf, "%u\n", value);
1265}
1266
1267static ssize_t bql_set(const char *buf, const size_t count,
1268 unsigned int *pvalue)
1269{
1270 unsigned int value;
1271 int err;
1272
1273 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1274 value = DQL_MAX_LIMIT;
1275 } else {
1276 err = kstrtouint(buf, 10, &value);
1277 if (err < 0)
1278 return err;
1279 if (value > DQL_MAX_LIMIT)
1280 return -EINVAL;
1281 }
1282
1283 *pvalue = value;
1284
1285 return count;
1286}
1287
1288static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1289 char *buf)
1290{
1291 struct dql *dql = &queue->dql;
1292
1293 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1294}
1295
1296static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1297 const char *buf, size_t len)
1298{
1299 struct dql *dql = &queue->dql;
1300 unsigned int value;
1301 int err;
1302
1303 err = kstrtouint(buf, 10, &value);
1304 if (err < 0)
1305 return err;
1306
1307 dql->slack_hold_time = msecs_to_jiffies(value);
1308
1309 return len;
1310}
1311
1312static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1313 = __ATTR(hold_time, 0644,
1314 bql_show_hold_time, bql_set_hold_time);
1315
1316static ssize_t bql_show_inflight(struct netdev_queue *queue,
1317 char *buf)
1318{
1319 struct dql *dql = &queue->dql;
1320
1321 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1322}
1323
1324static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1325 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1326
1327#define BQL_ATTR(NAME, FIELD) \
1328static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1329 char *buf) \
1330{ \
1331 return bql_show(buf, queue->dql.FIELD); \
1332} \
1333 \
1334static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1335 const char *buf, size_t len) \
1336{ \
1337 return bql_set(buf, len, &queue->dql.FIELD); \
1338} \
1339 \
1340static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1341 = __ATTR(NAME, 0644, \
1342 bql_show_ ## NAME, bql_set_ ## NAME)
1343
1344BQL_ATTR(limit, limit);
1345BQL_ATTR(limit_max, max_limit);
1346BQL_ATTR(limit_min, min_limit);
1347
1348static struct attribute *dql_attrs[] __ro_after_init = {
1349 &bql_limit_attribute.attr,
1350 &bql_limit_max_attribute.attr,
1351 &bql_limit_min_attribute.attr,
1352 &bql_hold_time_attribute.attr,
1353 &bql_inflight_attribute.attr,
1354 NULL
1355};
1356
1357static const struct attribute_group dql_group = {
1358 .name = "byte_queue_limits",
1359 .attrs = dql_attrs,
1360};
1361#endif /* CONFIG_BQL */
1362
1363#ifdef CONFIG_XPS
1364static ssize_t xps_queue_show(struct net_device *dev, unsigned int index,
1365 int tc, char *buf, enum xps_map_type type)
1366{
1367 struct xps_dev_maps *dev_maps;
1368 unsigned long *mask;
1369 unsigned int nr_ids;
1370 int j, len;
1371
1372 rcu_read_lock();
1373 dev_maps = rcu_dereference(dev->xps_maps[type]);
1374
1375 /* Default to nr_cpu_ids/dev->num_rx_queues and do not just return 0
1376 * when dev_maps hasn't been allocated yet, to be backward compatible.
1377 */
1378 nr_ids = dev_maps ? dev_maps->nr_ids :
1379 (type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues);
1380
1381 mask = bitmap_zalloc(nr_ids, GFP_NOWAIT);
1382 if (!mask) {
1383 rcu_read_unlock();
1384 return -ENOMEM;
1385 }
1386
1387 if (!dev_maps || tc >= dev_maps->num_tc)
1388 goto out_no_maps;
1389
1390 for (j = 0; j < nr_ids; j++) {
1391 int i, tci = j * dev_maps->num_tc + tc;
1392 struct xps_map *map;
1393
1394 map = rcu_dereference(dev_maps->attr_map[tci]);
1395 if (!map)
1396 continue;
1397
1398 for (i = map->len; i--;) {
1399 if (map->queues[i] == index) {
1400 set_bit(j, mask);
1401 break;
1402 }
1403 }
1404 }
1405out_no_maps:
1406 rcu_read_unlock();
1407
1408 len = bitmap_print_to_pagebuf(false, buf, mask, nr_ids);
1409 bitmap_free(mask);
1410
1411 return len < PAGE_SIZE ? len : -EINVAL;
1412}
1413
1414static ssize_t xps_cpus_show(struct netdev_queue *queue, char *buf)
1415{
1416 struct net_device *dev = queue->dev;
1417 unsigned int index;
1418 int len, tc;
1419
1420 if (!netif_is_multiqueue(dev))
1421 return -ENOENT;
1422
1423 index = get_netdev_queue_index(queue);
1424
1425 if (!rtnl_trylock())
1426 return restart_syscall();
1427
1428 /* If queue belongs to subordinate dev use its map */
1429 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1430
1431 tc = netdev_txq_to_tc(dev, index);
1432 if (tc < 0) {
1433 rtnl_unlock();
1434 return -EINVAL;
1435 }
1436
1437 /* Make sure the subordinate device can't be freed */
1438 get_device(&dev->dev);
1439 rtnl_unlock();
1440
1441 len = xps_queue_show(dev, index, tc, buf, XPS_CPUS);
1442
1443 put_device(&dev->dev);
1444 return len;
1445}
1446
1447static ssize_t xps_cpus_store(struct netdev_queue *queue,
1448 const char *buf, size_t len)
1449{
1450 struct net_device *dev = queue->dev;
1451 unsigned int index;
1452 cpumask_var_t mask;
1453 int err;
1454
1455 if (!netif_is_multiqueue(dev))
1456 return -ENOENT;
1457
1458 if (!capable(CAP_NET_ADMIN))
1459 return -EPERM;
1460
1461 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1462 return -ENOMEM;
1463
1464 index = get_netdev_queue_index(queue);
1465
1466 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1467 if (err) {
1468 free_cpumask_var(mask);
1469 return err;
1470 }
1471
1472 if (!rtnl_trylock()) {
1473 free_cpumask_var(mask);
1474 return restart_syscall();
1475 }
1476
1477 err = netif_set_xps_queue(dev, mask, index);
1478 rtnl_unlock();
1479
1480 free_cpumask_var(mask);
1481
1482 return err ? : len;
1483}
1484
1485static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1486 = __ATTR_RW(xps_cpus);
1487
1488static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1489{
1490 struct net_device *dev = queue->dev;
1491 unsigned int index;
1492 int tc;
1493
1494 index = get_netdev_queue_index(queue);
1495
1496 if (!rtnl_trylock())
1497 return restart_syscall();
1498
1499 tc = netdev_txq_to_tc(dev, index);
1500 rtnl_unlock();
1501 if (tc < 0)
1502 return -EINVAL;
1503
1504 return xps_queue_show(dev, index, tc, buf, XPS_RXQS);
1505}
1506
1507static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1508 size_t len)
1509{
1510 struct net_device *dev = queue->dev;
1511 struct net *net = dev_net(dev);
1512 unsigned long *mask;
1513 unsigned int index;
1514 int err;
1515
1516 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1517 return -EPERM;
1518
1519 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1520 if (!mask)
1521 return -ENOMEM;
1522
1523 index = get_netdev_queue_index(queue);
1524
1525 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1526 if (err) {
1527 bitmap_free(mask);
1528 return err;
1529 }
1530
1531 if (!rtnl_trylock()) {
1532 bitmap_free(mask);
1533 return restart_syscall();
1534 }
1535
1536 cpus_read_lock();
1537 err = __netif_set_xps_queue(dev, mask, index, XPS_RXQS);
1538 cpus_read_unlock();
1539
1540 rtnl_unlock();
1541
1542 bitmap_free(mask);
1543 return err ? : len;
1544}
1545
1546static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1547 = __ATTR_RW(xps_rxqs);
1548#endif /* CONFIG_XPS */
1549
1550static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1551 &queue_trans_timeout.attr,
1552 &queue_traffic_class.attr,
1553#ifdef CONFIG_XPS
1554 &xps_cpus_attribute.attr,
1555 &xps_rxqs_attribute.attr,
1556 &queue_tx_maxrate.attr,
1557#endif
1558 NULL
1559};
1560ATTRIBUTE_GROUPS(netdev_queue_default);
1561
1562static void netdev_queue_release(struct kobject *kobj)
1563{
1564 struct netdev_queue *queue = to_netdev_queue(kobj);
1565
1566 memset(kobj, 0, sizeof(*kobj));
1567 dev_put(queue->dev);
1568}
1569
1570static const void *netdev_queue_namespace(struct kobject *kobj)
1571{
1572 struct netdev_queue *queue = to_netdev_queue(kobj);
1573 struct device *dev = &queue->dev->dev;
1574 const void *ns = NULL;
1575
1576 if (dev->class && dev->class->ns_type)
1577 ns = dev->class->namespace(dev);
1578
1579 return ns;
1580}
1581
1582static void netdev_queue_get_ownership(struct kobject *kobj,
1583 kuid_t *uid, kgid_t *gid)
1584{
1585 const struct net *net = netdev_queue_namespace(kobj);
1586
1587 net_ns_get_ownership(net, uid, gid);
1588}
1589
1590static struct kobj_type netdev_queue_ktype __ro_after_init = {
1591 .sysfs_ops = &netdev_queue_sysfs_ops,
1592 .release = netdev_queue_release,
1593 .default_groups = netdev_queue_default_groups,
1594 .namespace = netdev_queue_namespace,
1595 .get_ownership = netdev_queue_get_ownership,
1596};
1597
1598static int netdev_queue_add_kobject(struct net_device *dev, int index)
1599{
1600 struct netdev_queue *queue = dev->_tx + index;
1601 struct kobject *kobj = &queue->kobj;
1602 int error = 0;
1603
1604 /* Kobject_put later will trigger netdev_queue_release call
1605 * which decreases dev refcount: Take that reference here
1606 */
1607 dev_hold(queue->dev);
1608
1609 kobj->kset = dev->queues_kset;
1610 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1611 "tx-%u", index);
1612 if (error)
1613 goto err;
1614
1615#ifdef CONFIG_BQL
1616 error = sysfs_create_group(kobj, &dql_group);
1617 if (error)
1618 goto err;
1619#endif
1620
1621 kobject_uevent(kobj, KOBJ_ADD);
1622 return 0;
1623
1624err:
1625 kobject_put(kobj);
1626 return error;
1627}
1628
1629static int tx_queue_change_owner(struct net_device *ndev, int index,
1630 kuid_t kuid, kgid_t kgid)
1631{
1632 struct netdev_queue *queue = ndev->_tx + index;
1633 struct kobject *kobj = &queue->kobj;
1634 int error;
1635
1636 error = sysfs_change_owner(kobj, kuid, kgid);
1637 if (error)
1638 return error;
1639
1640#ifdef CONFIG_BQL
1641 error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
1642#endif
1643 return error;
1644}
1645#endif /* CONFIG_SYSFS */
1646
1647int
1648netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1649{
1650#ifdef CONFIG_SYSFS
1651 int i;
1652 int error = 0;
1653
1654 for (i = old_num; i < new_num; i++) {
1655 error = netdev_queue_add_kobject(dev, i);
1656 if (error) {
1657 new_num = old_num;
1658 break;
1659 }
1660 }
1661
1662 while (--i >= new_num) {
1663 struct netdev_queue *queue = dev->_tx + i;
1664
1665 if (!refcount_read(&dev_net(dev)->ns.count))
1666 queue->kobj.uevent_suppress = 1;
1667#ifdef CONFIG_BQL
1668 sysfs_remove_group(&queue->kobj, &dql_group);
1669#endif
1670 kobject_put(&queue->kobj);
1671 }
1672
1673 return error;
1674#else
1675 return 0;
1676#endif /* CONFIG_SYSFS */
1677}
1678
1679static int net_tx_queue_change_owner(struct net_device *dev, int num,
1680 kuid_t kuid, kgid_t kgid)
1681{
1682#ifdef CONFIG_SYSFS
1683 int error = 0;
1684 int i;
1685
1686 for (i = 0; i < num; i++) {
1687 error = tx_queue_change_owner(dev, i, kuid, kgid);
1688 if (error)
1689 break;
1690 }
1691
1692 return error;
1693#else
1694 return 0;
1695#endif /* CONFIG_SYSFS */
1696}
1697
1698static int register_queue_kobjects(struct net_device *dev)
1699{
1700 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1701
1702#ifdef CONFIG_SYSFS
1703 dev->queues_kset = kset_create_and_add("queues",
1704 NULL, &dev->dev.kobj);
1705 if (!dev->queues_kset)
1706 return -ENOMEM;
1707 real_rx = dev->real_num_rx_queues;
1708#endif
1709 real_tx = dev->real_num_tx_queues;
1710
1711 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1712 if (error)
1713 goto error;
1714 rxq = real_rx;
1715
1716 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1717 if (error)
1718 goto error;
1719 txq = real_tx;
1720
1721 return 0;
1722
1723error:
1724 netdev_queue_update_kobjects(dev, txq, 0);
1725 net_rx_queue_update_kobjects(dev, rxq, 0);
1726#ifdef CONFIG_SYSFS
1727 kset_unregister(dev->queues_kset);
1728#endif
1729 return error;
1730}
1731
1732static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
1733{
1734 int error = 0, real_rx = 0, real_tx = 0;
1735
1736#ifdef CONFIG_SYSFS
1737 if (ndev->queues_kset) {
1738 error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
1739 if (error)
1740 return error;
1741 }
1742 real_rx = ndev->real_num_rx_queues;
1743#endif
1744 real_tx = ndev->real_num_tx_queues;
1745
1746 error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
1747 if (error)
1748 return error;
1749
1750 error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
1751 if (error)
1752 return error;
1753
1754 return 0;
1755}
1756
1757static void remove_queue_kobjects(struct net_device *dev)
1758{
1759 int real_rx = 0, real_tx = 0;
1760
1761#ifdef CONFIG_SYSFS
1762 real_rx = dev->real_num_rx_queues;
1763#endif
1764 real_tx = dev->real_num_tx_queues;
1765
1766 net_rx_queue_update_kobjects(dev, real_rx, 0);
1767 netdev_queue_update_kobjects(dev, real_tx, 0);
1768#ifdef CONFIG_SYSFS
1769 kset_unregister(dev->queues_kset);
1770#endif
1771}
1772
1773static bool net_current_may_mount(void)
1774{
1775 struct net *net = current->nsproxy->net_ns;
1776
1777 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1778}
1779
1780static void *net_grab_current_ns(void)
1781{
1782 struct net *ns = current->nsproxy->net_ns;
1783#ifdef CONFIG_NET_NS
1784 if (ns)
1785 refcount_inc(&ns->passive);
1786#endif
1787 return ns;
1788}
1789
1790static const void *net_initial_ns(void)
1791{
1792 return &init_net;
1793}
1794
1795static const void *net_netlink_ns(struct sock *sk)
1796{
1797 return sock_net(sk);
1798}
1799
1800const struct kobj_ns_type_operations net_ns_type_operations = {
1801 .type = KOBJ_NS_TYPE_NET,
1802 .current_may_mount = net_current_may_mount,
1803 .grab_current_ns = net_grab_current_ns,
1804 .netlink_ns = net_netlink_ns,
1805 .initial_ns = net_initial_ns,
1806 .drop_ns = net_drop_ns,
1807};
1808EXPORT_SYMBOL_GPL(net_ns_type_operations);
1809
1810static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1811{
1812 struct net_device *dev = to_net_dev(d);
1813 int retval;
1814
1815 /* pass interface to uevent. */
1816 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1817 if (retval)
1818 goto exit;
1819
1820 /* pass ifindex to uevent.
1821 * ifindex is useful as it won't change (interface name may change)
1822 * and is what RtNetlink uses natively.
1823 */
1824 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1825
1826exit:
1827 return retval;
1828}
1829
1830/*
1831 * netdev_release -- destroy and free a dead device.
1832 * Called when last reference to device kobject is gone.
1833 */
1834static void netdev_release(struct device *d)
1835{
1836 struct net_device *dev = to_net_dev(d);
1837
1838 BUG_ON(dev->reg_state != NETREG_RELEASED);
1839
1840 /* no need to wait for rcu grace period:
1841 * device is dead and about to be freed.
1842 */
1843 kfree(rcu_access_pointer(dev->ifalias));
1844 netdev_freemem(dev);
1845}
1846
1847static const void *net_namespace(struct device *d)
1848{
1849 struct net_device *dev = to_net_dev(d);
1850
1851 return dev_net(dev);
1852}
1853
1854static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1855{
1856 struct net_device *dev = to_net_dev(d);
1857 const struct net *net = dev_net(dev);
1858
1859 net_ns_get_ownership(net, uid, gid);
1860}
1861
1862static struct class net_class __ro_after_init = {
1863 .name = "net",
1864 .dev_release = netdev_release,
1865 .dev_groups = net_class_groups,
1866 .dev_uevent = netdev_uevent,
1867 .ns_type = &net_ns_type_operations,
1868 .namespace = net_namespace,
1869 .get_ownership = net_get_ownership,
1870};
1871
1872#ifdef CONFIG_OF_NET
1873static int of_dev_node_match(struct device *dev, const void *data)
1874{
1875 for (; dev; dev = dev->parent) {
1876 if (dev->of_node == data)
1877 return 1;
1878 }
1879
1880 return 0;
1881}
1882
1883/*
1884 * of_find_net_device_by_node - lookup the net device for the device node
1885 * @np: OF device node
1886 *
1887 * Looks up the net_device structure corresponding with the device node.
1888 * If successful, returns a pointer to the net_device with the embedded
1889 * struct device refcount incremented by one, or NULL on failure. The
1890 * refcount must be dropped when done with the net_device.
1891 */
1892struct net_device *of_find_net_device_by_node(struct device_node *np)
1893{
1894 struct device *dev;
1895
1896 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1897 if (!dev)
1898 return NULL;
1899
1900 return to_net_dev(dev);
1901}
1902EXPORT_SYMBOL(of_find_net_device_by_node);
1903#endif
1904
1905/* Delete sysfs entries but hold kobject reference until after all
1906 * netdev references are gone.
1907 */
1908void netdev_unregister_kobject(struct net_device *ndev)
1909{
1910 struct device *dev = &ndev->dev;
1911
1912 if (!refcount_read(&dev_net(ndev)->ns.count))
1913 dev_set_uevent_suppress(dev, 1);
1914
1915 kobject_get(&dev->kobj);
1916
1917 remove_queue_kobjects(ndev);
1918
1919 pm_runtime_set_memalloc_noio(dev, false);
1920
1921 device_del(dev);
1922}
1923
1924/* Create sysfs entries for network device. */
1925int netdev_register_kobject(struct net_device *ndev)
1926{
1927 struct device *dev = &ndev->dev;
1928 const struct attribute_group **groups = ndev->sysfs_groups;
1929 int error = 0;
1930
1931 device_initialize(dev);
1932 dev->class = &net_class;
1933 dev->platform_data = ndev;
1934 dev->groups = groups;
1935
1936 dev_set_name(dev, "%s", ndev->name);
1937
1938#ifdef CONFIG_SYSFS
1939 /* Allow for a device specific group */
1940 if (*groups)
1941 groups++;
1942
1943 *groups++ = &netstat_group;
1944
1945#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1946 if (ndev->ieee80211_ptr)
1947 *groups++ = &wireless_group;
1948#if IS_ENABLED(CONFIG_WIRELESS_EXT)
1949 else if (ndev->wireless_handlers)
1950 *groups++ = &wireless_group;
1951#endif
1952#endif
1953#endif /* CONFIG_SYSFS */
1954
1955 error = device_add(dev);
1956 if (error)
1957 return error;
1958
1959 error = register_queue_kobjects(ndev);
1960 if (error) {
1961 device_del(dev);
1962 return error;
1963 }
1964
1965 pm_runtime_set_memalloc_noio(dev, true);
1966
1967 return error;
1968}
1969
1970/* Change owner for sysfs entries when moving network devices across network
1971 * namespaces owned by different user namespaces.
1972 */
1973int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
1974 const struct net *net_new)
1975{
1976 struct device *dev = &ndev->dev;
1977 kuid_t old_uid, new_uid;
1978 kgid_t old_gid, new_gid;
1979 int error;
1980
1981 net_ns_get_ownership(net_old, &old_uid, &old_gid);
1982 net_ns_get_ownership(net_new, &new_uid, &new_gid);
1983
1984 /* The network namespace was changed but the owning user namespace is
1985 * identical so there's no need to change the owner of sysfs entries.
1986 */
1987 if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid))
1988 return 0;
1989
1990 error = device_change_owner(dev, new_uid, new_gid);
1991 if (error)
1992 return error;
1993
1994 error = queue_change_owner(ndev, new_uid, new_gid);
1995 if (error)
1996 return error;
1997
1998 return 0;
1999}
2000
2001int netdev_class_create_file_ns(const struct class_attribute *class_attr,
2002 const void *ns)
2003{
2004 return class_create_file_ns(&net_class, class_attr, ns);
2005}
2006EXPORT_SYMBOL(netdev_class_create_file_ns);
2007
2008void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
2009 const void *ns)
2010{
2011 class_remove_file_ns(&net_class, class_attr, ns);
2012}
2013EXPORT_SYMBOL(netdev_class_remove_file_ns);
2014
2015int __init netdev_kobject_init(void)
2016{
2017 kobj_ns_type_register(&net_ns_type_operations);
2018 return class_register(&net_class);
2019}
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/sched/isolation.h>
15#include <linux/nsproxy.h>
16#include <net/sock.h>
17#include <net/net_namespace.h>
18#include <linux/rtnetlink.h>
19#include <linux/vmalloc.h>
20#include <linux/export.h>
21#include <linux/jiffies.h>
22#include <linux/pm_runtime.h>
23#include <linux/of.h>
24#include <linux/of_net.h>
25#include <linux/cpu.h>
26
27#include "dev.h"
28#include "net-sysfs.h"
29
30#ifdef CONFIG_SYSFS
31static const char fmt_hex[] = "%#x\n";
32static const char fmt_dec[] = "%d\n";
33static const char fmt_ulong[] = "%lu\n";
34static const char fmt_u64[] = "%llu\n";
35
36/* Caller holds RTNL or dev_base_lock */
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 sysfs_emit(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;
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 ret = (*set)(netdev, new);
100 if (ret == 0)
101 ret = len;
102 }
103 rtnl_unlock();
104 err:
105 return ret;
106}
107
108NETDEVICE_SHOW_RO(dev_id, fmt_hex);
109NETDEVICE_SHOW_RO(dev_port, fmt_dec);
110NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
111NETDEVICE_SHOW_RO(addr_len, fmt_dec);
112NETDEVICE_SHOW_RO(ifindex, fmt_dec);
113NETDEVICE_SHOW_RO(type, fmt_dec);
114NETDEVICE_SHOW_RO(link_mode, fmt_dec);
115
116static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
117 char *buf)
118{
119 struct net_device *ndev = to_net_dev(dev);
120
121 return sysfs_emit(buf, fmt_dec, dev_get_iflink(ndev));
122}
123static DEVICE_ATTR_RO(iflink);
124
125static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
126{
127 return sysfs_emit(buf, fmt_dec, dev->name_assign_type);
128}
129
130static ssize_t name_assign_type_show(struct device *dev,
131 struct device_attribute *attr,
132 char *buf)
133{
134 struct net_device *ndev = to_net_dev(dev);
135 ssize_t ret = -EINVAL;
136
137 if (ndev->name_assign_type != NET_NAME_UNKNOWN)
138 ret = netdev_show(dev, attr, buf, format_name_assign_type);
139
140 return ret;
141}
142static DEVICE_ATTR_RO(name_assign_type);
143
144/* use same locking rules as GIFHWADDR ioctl's */
145static ssize_t address_show(struct device *dev, struct device_attribute *attr,
146 char *buf)
147{
148 struct net_device *ndev = to_net_dev(dev);
149 ssize_t ret = -EINVAL;
150
151 read_lock(&dev_base_lock);
152 if (dev_isalive(ndev))
153 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
154 read_unlock(&dev_base_lock);
155 return ret;
156}
157static DEVICE_ATTR_RO(address);
158
159static ssize_t broadcast_show(struct device *dev,
160 struct device_attribute *attr, char *buf)
161{
162 struct net_device *ndev = to_net_dev(dev);
163
164 if (dev_isalive(ndev))
165 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
166 return -EINVAL;
167}
168static DEVICE_ATTR_RO(broadcast);
169
170static int change_carrier(struct net_device *dev, unsigned long new_carrier)
171{
172 if (!netif_running(dev))
173 return -EINVAL;
174 return dev_change_carrier(dev, (bool)new_carrier);
175}
176
177static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
178 const char *buf, size_t len)
179{
180 struct net_device *netdev = to_net_dev(dev);
181
182 /* The check is also done in change_carrier; this helps returning early
183 * without hitting the trylock/restart in netdev_store.
184 */
185 if (!netdev->netdev_ops->ndo_change_carrier)
186 return -EOPNOTSUPP;
187
188 return netdev_store(dev, attr, buf, len, change_carrier);
189}
190
191static ssize_t carrier_show(struct device *dev,
192 struct device_attribute *attr, char *buf)
193{
194 struct net_device *netdev = to_net_dev(dev);
195
196 if (netif_running(netdev))
197 return sysfs_emit(buf, fmt_dec, !!netif_carrier_ok(netdev));
198
199 return -EINVAL;
200}
201static DEVICE_ATTR_RW(carrier);
202
203static ssize_t speed_show(struct device *dev,
204 struct device_attribute *attr, char *buf)
205{
206 struct net_device *netdev = to_net_dev(dev);
207 int ret = -EINVAL;
208
209 /* The check is also done in __ethtool_get_link_ksettings; this helps
210 * returning early without hitting the trylock/restart below.
211 */
212 if (!netdev->ethtool_ops->get_link_ksettings)
213 return ret;
214
215 if (!rtnl_trylock())
216 return restart_syscall();
217
218 if (netif_running(netdev) && netif_device_present(netdev)) {
219 struct ethtool_link_ksettings cmd;
220
221 if (!__ethtool_get_link_ksettings(netdev, &cmd))
222 ret = sysfs_emit(buf, fmt_dec, cmd.base.speed);
223 }
224 rtnl_unlock();
225 return ret;
226}
227static DEVICE_ATTR_RO(speed);
228
229static ssize_t duplex_show(struct device *dev,
230 struct device_attribute *attr, char *buf)
231{
232 struct net_device *netdev = to_net_dev(dev);
233 int ret = -EINVAL;
234
235 /* The check is also done in __ethtool_get_link_ksettings; this helps
236 * returning early without hitting the trylock/restart below.
237 */
238 if (!netdev->ethtool_ops->get_link_ksettings)
239 return ret;
240
241 if (!rtnl_trylock())
242 return restart_syscall();
243
244 if (netif_running(netdev)) {
245 struct ethtool_link_ksettings cmd;
246
247 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
248 const char *duplex;
249
250 switch (cmd.base.duplex) {
251 case DUPLEX_HALF:
252 duplex = "half";
253 break;
254 case DUPLEX_FULL:
255 duplex = "full";
256 break;
257 default:
258 duplex = "unknown";
259 break;
260 }
261 ret = sysfs_emit(buf, "%s\n", duplex);
262 }
263 }
264 rtnl_unlock();
265 return ret;
266}
267static DEVICE_ATTR_RO(duplex);
268
269static ssize_t testing_show(struct device *dev,
270 struct device_attribute *attr, char *buf)
271{
272 struct net_device *netdev = to_net_dev(dev);
273
274 if (netif_running(netdev))
275 return sysfs_emit(buf, fmt_dec, !!netif_testing(netdev));
276
277 return -EINVAL;
278}
279static DEVICE_ATTR_RO(testing);
280
281static ssize_t dormant_show(struct device *dev,
282 struct device_attribute *attr, char *buf)
283{
284 struct net_device *netdev = to_net_dev(dev);
285
286 if (netif_running(netdev))
287 return sysfs_emit(buf, fmt_dec, !!netif_dormant(netdev));
288
289 return -EINVAL;
290}
291static DEVICE_ATTR_RO(dormant);
292
293static const char *const operstates[] = {
294 "unknown",
295 "notpresent", /* currently unused */
296 "down",
297 "lowerlayerdown",
298 "testing",
299 "dormant",
300 "up"
301};
302
303static ssize_t operstate_show(struct device *dev,
304 struct device_attribute *attr, char *buf)
305{
306 const struct net_device *netdev = to_net_dev(dev);
307 unsigned char operstate;
308
309 read_lock(&dev_base_lock);
310 operstate = netdev->operstate;
311 if (!netif_running(netdev))
312 operstate = IF_OPER_DOWN;
313 read_unlock(&dev_base_lock);
314
315 if (operstate >= ARRAY_SIZE(operstates))
316 return -EINVAL; /* should not happen */
317
318 return sysfs_emit(buf, "%s\n", operstates[operstate]);
319}
320static DEVICE_ATTR_RO(operstate);
321
322static ssize_t carrier_changes_show(struct device *dev,
323 struct device_attribute *attr,
324 char *buf)
325{
326 struct net_device *netdev = to_net_dev(dev);
327
328 return sysfs_emit(buf, fmt_dec,
329 atomic_read(&netdev->carrier_up_count) +
330 atomic_read(&netdev->carrier_down_count));
331}
332static DEVICE_ATTR_RO(carrier_changes);
333
334static ssize_t carrier_up_count_show(struct device *dev,
335 struct device_attribute *attr,
336 char *buf)
337{
338 struct net_device *netdev = to_net_dev(dev);
339
340 return sysfs_emit(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
341}
342static DEVICE_ATTR_RO(carrier_up_count);
343
344static ssize_t carrier_down_count_show(struct device *dev,
345 struct device_attribute *attr,
346 char *buf)
347{
348 struct net_device *netdev = to_net_dev(dev);
349
350 return sysfs_emit(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
351}
352static DEVICE_ATTR_RO(carrier_down_count);
353
354/* read-write attributes */
355
356static int change_mtu(struct net_device *dev, unsigned long new_mtu)
357{
358 return dev_set_mtu(dev, (int)new_mtu);
359}
360
361static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
362 const char *buf, size_t len)
363{
364 return netdev_store(dev, attr, buf, len, change_mtu);
365}
366NETDEVICE_SHOW_RW(mtu, fmt_dec);
367
368static int change_flags(struct net_device *dev, unsigned long new_flags)
369{
370 return dev_change_flags(dev, (unsigned int)new_flags, NULL);
371}
372
373static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
374 const char *buf, size_t len)
375{
376 return netdev_store(dev, attr, buf, len, change_flags);
377}
378NETDEVICE_SHOW_RW(flags, fmt_hex);
379
380static ssize_t tx_queue_len_store(struct device *dev,
381 struct device_attribute *attr,
382 const char *buf, size_t len)
383{
384 if (!capable(CAP_NET_ADMIN))
385 return -EPERM;
386
387 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
388}
389NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
390
391static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
392{
393 WRITE_ONCE(dev->gro_flush_timeout, val);
394 return 0;
395}
396
397static ssize_t gro_flush_timeout_store(struct device *dev,
398 struct device_attribute *attr,
399 const char *buf, size_t len)
400{
401 if (!capable(CAP_NET_ADMIN))
402 return -EPERM;
403
404 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
405}
406NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
407
408static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val)
409{
410 WRITE_ONCE(dev->napi_defer_hard_irqs, val);
411 return 0;
412}
413
414static ssize_t napi_defer_hard_irqs_store(struct device *dev,
415 struct device_attribute *attr,
416 const char *buf, size_t len)
417{
418 if (!capable(CAP_NET_ADMIN))
419 return -EPERM;
420
421 return netdev_store(dev, attr, buf, len, change_napi_defer_hard_irqs);
422}
423NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_dec);
424
425static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
426 const char *buf, size_t len)
427{
428 struct net_device *netdev = to_net_dev(dev);
429 struct net *net = dev_net(netdev);
430 size_t count = len;
431 ssize_t ret = 0;
432
433 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
434 return -EPERM;
435
436 /* ignore trailing newline */
437 if (len > 0 && buf[len - 1] == '\n')
438 --count;
439
440 if (!rtnl_trylock())
441 return restart_syscall();
442
443 if (dev_isalive(netdev)) {
444 ret = dev_set_alias(netdev, buf, count);
445 if (ret < 0)
446 goto err;
447 ret = len;
448 netdev_state_change(netdev);
449 }
450err:
451 rtnl_unlock();
452
453 return ret;
454}
455
456static ssize_t ifalias_show(struct device *dev,
457 struct device_attribute *attr, char *buf)
458{
459 const struct net_device *netdev = to_net_dev(dev);
460 char tmp[IFALIASZ];
461 ssize_t ret = 0;
462
463 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
464 if (ret > 0)
465 ret = sysfs_emit(buf, "%s\n", tmp);
466 return ret;
467}
468static DEVICE_ATTR_RW(ifalias);
469
470static int change_group(struct net_device *dev, unsigned long new_group)
471{
472 dev_set_group(dev, (int)new_group);
473 return 0;
474}
475
476static ssize_t group_store(struct device *dev, struct device_attribute *attr,
477 const char *buf, size_t len)
478{
479 return netdev_store(dev, attr, buf, len, change_group);
480}
481NETDEVICE_SHOW(group, fmt_dec);
482static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
483
484static int change_proto_down(struct net_device *dev, unsigned long proto_down)
485{
486 return dev_change_proto_down(dev, (bool)proto_down);
487}
488
489static ssize_t proto_down_store(struct device *dev,
490 struct device_attribute *attr,
491 const char *buf, size_t len)
492{
493 return netdev_store(dev, attr, buf, len, change_proto_down);
494}
495NETDEVICE_SHOW_RW(proto_down, fmt_dec);
496
497static ssize_t phys_port_id_show(struct device *dev,
498 struct device_attribute *attr, char *buf)
499{
500 struct net_device *netdev = to_net_dev(dev);
501 ssize_t ret = -EINVAL;
502
503 /* The check is also done in dev_get_phys_port_id; this helps returning
504 * early without hitting the trylock/restart below.
505 */
506 if (!netdev->netdev_ops->ndo_get_phys_port_id)
507 return -EOPNOTSUPP;
508
509 if (!rtnl_trylock())
510 return restart_syscall();
511
512 if (dev_isalive(netdev)) {
513 struct netdev_phys_item_id ppid;
514
515 ret = dev_get_phys_port_id(netdev, &ppid);
516 if (!ret)
517 ret = sysfs_emit(buf, "%*phN\n", ppid.id_len, ppid.id);
518 }
519 rtnl_unlock();
520
521 return ret;
522}
523static DEVICE_ATTR_RO(phys_port_id);
524
525static ssize_t phys_port_name_show(struct device *dev,
526 struct device_attribute *attr, char *buf)
527{
528 struct net_device *netdev = to_net_dev(dev);
529 ssize_t ret = -EINVAL;
530
531 /* The checks are also done in dev_get_phys_port_name; this helps
532 * returning early without hitting the trylock/restart below.
533 */
534 if (!netdev->netdev_ops->ndo_get_phys_port_name &&
535 !netdev->devlink_port)
536 return -EOPNOTSUPP;
537
538 if (!rtnl_trylock())
539 return restart_syscall();
540
541 if (dev_isalive(netdev)) {
542 char name[IFNAMSIZ];
543
544 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
545 if (!ret)
546 ret = sysfs_emit(buf, "%s\n", name);
547 }
548 rtnl_unlock();
549
550 return ret;
551}
552static DEVICE_ATTR_RO(phys_port_name);
553
554static ssize_t phys_switch_id_show(struct device *dev,
555 struct device_attribute *attr, char *buf)
556{
557 struct net_device *netdev = to_net_dev(dev);
558 ssize_t ret = -EINVAL;
559
560 /* The checks are also done in dev_get_phys_port_name; this helps
561 * returning early without hitting the trylock/restart below. This works
562 * because recurse is false when calling dev_get_port_parent_id.
563 */
564 if (!netdev->netdev_ops->ndo_get_port_parent_id &&
565 !netdev->devlink_port)
566 return -EOPNOTSUPP;
567
568 if (!rtnl_trylock())
569 return restart_syscall();
570
571 if (dev_isalive(netdev)) {
572 struct netdev_phys_item_id ppid = { };
573
574 ret = dev_get_port_parent_id(netdev, &ppid, false);
575 if (!ret)
576 ret = sysfs_emit(buf, "%*phN\n", ppid.id_len, ppid.id);
577 }
578 rtnl_unlock();
579
580 return ret;
581}
582static DEVICE_ATTR_RO(phys_switch_id);
583
584static ssize_t threaded_show(struct device *dev,
585 struct device_attribute *attr, char *buf)
586{
587 struct net_device *netdev = to_net_dev(dev);
588 ssize_t ret = -EINVAL;
589
590 if (!rtnl_trylock())
591 return restart_syscall();
592
593 if (dev_isalive(netdev))
594 ret = sysfs_emit(buf, fmt_dec, netdev->threaded);
595
596 rtnl_unlock();
597 return ret;
598}
599
600static int modify_napi_threaded(struct net_device *dev, unsigned long val)
601{
602 int ret;
603
604 if (list_empty(&dev->napi_list))
605 return -EOPNOTSUPP;
606
607 if (val != 0 && val != 1)
608 return -EOPNOTSUPP;
609
610 ret = dev_set_threaded(dev, val);
611
612 return ret;
613}
614
615static ssize_t threaded_store(struct device *dev,
616 struct device_attribute *attr,
617 const char *buf, size_t len)
618{
619 return netdev_store(dev, attr, buf, len, modify_napi_threaded);
620}
621static DEVICE_ATTR_RW(threaded);
622
623static struct attribute *net_class_attrs[] __ro_after_init = {
624 &dev_attr_netdev_group.attr,
625 &dev_attr_type.attr,
626 &dev_attr_dev_id.attr,
627 &dev_attr_dev_port.attr,
628 &dev_attr_iflink.attr,
629 &dev_attr_ifindex.attr,
630 &dev_attr_name_assign_type.attr,
631 &dev_attr_addr_assign_type.attr,
632 &dev_attr_addr_len.attr,
633 &dev_attr_link_mode.attr,
634 &dev_attr_address.attr,
635 &dev_attr_broadcast.attr,
636 &dev_attr_speed.attr,
637 &dev_attr_duplex.attr,
638 &dev_attr_dormant.attr,
639 &dev_attr_testing.attr,
640 &dev_attr_operstate.attr,
641 &dev_attr_carrier_changes.attr,
642 &dev_attr_ifalias.attr,
643 &dev_attr_carrier.attr,
644 &dev_attr_mtu.attr,
645 &dev_attr_flags.attr,
646 &dev_attr_tx_queue_len.attr,
647 &dev_attr_gro_flush_timeout.attr,
648 &dev_attr_napi_defer_hard_irqs.attr,
649 &dev_attr_phys_port_id.attr,
650 &dev_attr_phys_port_name.attr,
651 &dev_attr_phys_switch_id.attr,
652 &dev_attr_proto_down.attr,
653 &dev_attr_carrier_up_count.attr,
654 &dev_attr_carrier_down_count.attr,
655 &dev_attr_threaded.attr,
656 NULL,
657};
658ATTRIBUTE_GROUPS(net_class);
659
660/* Show a given an attribute in the statistics group */
661static ssize_t netstat_show(const struct device *d,
662 struct device_attribute *attr, char *buf,
663 unsigned long offset)
664{
665 struct net_device *dev = to_net_dev(d);
666 ssize_t ret = -EINVAL;
667
668 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
669 offset % sizeof(u64) != 0);
670
671 read_lock(&dev_base_lock);
672 if (dev_isalive(dev)) {
673 struct rtnl_link_stats64 temp;
674 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
675
676 ret = sysfs_emit(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
677 }
678 read_unlock(&dev_base_lock);
679 return ret;
680}
681
682/* generate a read-only statistics attribute */
683#define NETSTAT_ENTRY(name) \
684static ssize_t name##_show(struct device *d, \
685 struct device_attribute *attr, char *buf) \
686{ \
687 return netstat_show(d, attr, buf, \
688 offsetof(struct rtnl_link_stats64, name)); \
689} \
690static DEVICE_ATTR_RO(name)
691
692NETSTAT_ENTRY(rx_packets);
693NETSTAT_ENTRY(tx_packets);
694NETSTAT_ENTRY(rx_bytes);
695NETSTAT_ENTRY(tx_bytes);
696NETSTAT_ENTRY(rx_errors);
697NETSTAT_ENTRY(tx_errors);
698NETSTAT_ENTRY(rx_dropped);
699NETSTAT_ENTRY(tx_dropped);
700NETSTAT_ENTRY(multicast);
701NETSTAT_ENTRY(collisions);
702NETSTAT_ENTRY(rx_length_errors);
703NETSTAT_ENTRY(rx_over_errors);
704NETSTAT_ENTRY(rx_crc_errors);
705NETSTAT_ENTRY(rx_frame_errors);
706NETSTAT_ENTRY(rx_fifo_errors);
707NETSTAT_ENTRY(rx_missed_errors);
708NETSTAT_ENTRY(tx_aborted_errors);
709NETSTAT_ENTRY(tx_carrier_errors);
710NETSTAT_ENTRY(tx_fifo_errors);
711NETSTAT_ENTRY(tx_heartbeat_errors);
712NETSTAT_ENTRY(tx_window_errors);
713NETSTAT_ENTRY(rx_compressed);
714NETSTAT_ENTRY(tx_compressed);
715NETSTAT_ENTRY(rx_nohandler);
716
717static struct attribute *netstat_attrs[] __ro_after_init = {
718 &dev_attr_rx_packets.attr,
719 &dev_attr_tx_packets.attr,
720 &dev_attr_rx_bytes.attr,
721 &dev_attr_tx_bytes.attr,
722 &dev_attr_rx_errors.attr,
723 &dev_attr_tx_errors.attr,
724 &dev_attr_rx_dropped.attr,
725 &dev_attr_tx_dropped.attr,
726 &dev_attr_multicast.attr,
727 &dev_attr_collisions.attr,
728 &dev_attr_rx_length_errors.attr,
729 &dev_attr_rx_over_errors.attr,
730 &dev_attr_rx_crc_errors.attr,
731 &dev_attr_rx_frame_errors.attr,
732 &dev_attr_rx_fifo_errors.attr,
733 &dev_attr_rx_missed_errors.attr,
734 &dev_attr_tx_aborted_errors.attr,
735 &dev_attr_tx_carrier_errors.attr,
736 &dev_attr_tx_fifo_errors.attr,
737 &dev_attr_tx_heartbeat_errors.attr,
738 &dev_attr_tx_window_errors.attr,
739 &dev_attr_rx_compressed.attr,
740 &dev_attr_tx_compressed.attr,
741 &dev_attr_rx_nohandler.attr,
742 NULL
743};
744
745static const struct attribute_group netstat_group = {
746 .name = "statistics",
747 .attrs = netstat_attrs,
748};
749
750static struct attribute *wireless_attrs[] = {
751 NULL
752};
753
754static const struct attribute_group wireless_group = {
755 .name = "wireless",
756 .attrs = wireless_attrs,
757};
758
759static bool wireless_group_needed(struct net_device *ndev)
760{
761#if IS_ENABLED(CONFIG_CFG80211)
762 if (ndev->ieee80211_ptr)
763 return true;
764#endif
765#if IS_ENABLED(CONFIG_WIRELESS_EXT)
766 if (ndev->wireless_handlers)
767 return true;
768#endif
769 return false;
770}
771
772#else /* CONFIG_SYSFS */
773#define net_class_groups NULL
774#endif /* CONFIG_SYSFS */
775
776#ifdef CONFIG_SYSFS
777#define to_rx_queue_attr(_attr) \
778 container_of(_attr, struct rx_queue_attribute, attr)
779
780#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
781
782static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
783 char *buf)
784{
785 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
786 struct netdev_rx_queue *queue = to_rx_queue(kobj);
787
788 if (!attribute->show)
789 return -EIO;
790
791 return attribute->show(queue, buf);
792}
793
794static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
795 const char *buf, size_t count)
796{
797 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
798 struct netdev_rx_queue *queue = to_rx_queue(kobj);
799
800 if (!attribute->store)
801 return -EIO;
802
803 return attribute->store(queue, buf, count);
804}
805
806static const struct sysfs_ops rx_queue_sysfs_ops = {
807 .show = rx_queue_attr_show,
808 .store = rx_queue_attr_store,
809};
810
811#ifdef CONFIG_RPS
812static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
813{
814 struct rps_map *map;
815 cpumask_var_t mask;
816 int i, len;
817
818 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
819 return -ENOMEM;
820
821 rcu_read_lock();
822 map = rcu_dereference(queue->rps_map);
823 if (map)
824 for (i = 0; i < map->len; i++)
825 cpumask_set_cpu(map->cpus[i], mask);
826
827 len = sysfs_emit(buf, "%*pb\n", cpumask_pr_args(mask));
828 rcu_read_unlock();
829 free_cpumask_var(mask);
830
831 return len < PAGE_SIZE ? len : -EINVAL;
832}
833
834static ssize_t store_rps_map(struct netdev_rx_queue *queue,
835 const char *buf, size_t len)
836{
837 struct rps_map *old_map, *map;
838 cpumask_var_t mask;
839 int err, cpu, i;
840 static DEFINE_MUTEX(rps_map_mutex);
841
842 if (!capable(CAP_NET_ADMIN))
843 return -EPERM;
844
845 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
846 return -ENOMEM;
847
848 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
849 if (err) {
850 free_cpumask_var(mask);
851 return err;
852 }
853
854 if (!cpumask_empty(mask)) {
855 cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_DOMAIN));
856 cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_WQ));
857 if (cpumask_empty(mask)) {
858 free_cpumask_var(mask);
859 return -EINVAL;
860 }
861 }
862
863 map = kzalloc(max_t(unsigned int,
864 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
865 GFP_KERNEL);
866 if (!map) {
867 free_cpumask_var(mask);
868 return -ENOMEM;
869 }
870
871 i = 0;
872 for_each_cpu_and(cpu, mask, cpu_online_mask)
873 map->cpus[i++] = cpu;
874
875 if (i) {
876 map->len = i;
877 } else {
878 kfree(map);
879 map = NULL;
880 }
881
882 mutex_lock(&rps_map_mutex);
883 old_map = rcu_dereference_protected(queue->rps_map,
884 mutex_is_locked(&rps_map_mutex));
885 rcu_assign_pointer(queue->rps_map, map);
886
887 if (map)
888 static_branch_inc(&rps_needed);
889 if (old_map)
890 static_branch_dec(&rps_needed);
891
892 mutex_unlock(&rps_map_mutex);
893
894 if (old_map)
895 kfree_rcu(old_map, rcu);
896
897 free_cpumask_var(mask);
898 return len;
899}
900
901static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
902 char *buf)
903{
904 struct rps_dev_flow_table *flow_table;
905 unsigned long val = 0;
906
907 rcu_read_lock();
908 flow_table = rcu_dereference(queue->rps_flow_table);
909 if (flow_table)
910 val = (unsigned long)flow_table->mask + 1;
911 rcu_read_unlock();
912
913 return sysfs_emit(buf, "%lu\n", val);
914}
915
916static void rps_dev_flow_table_release(struct rcu_head *rcu)
917{
918 struct rps_dev_flow_table *table = container_of(rcu,
919 struct rps_dev_flow_table, rcu);
920 vfree(table);
921}
922
923static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
924 const char *buf, size_t len)
925{
926 unsigned long mask, count;
927 struct rps_dev_flow_table *table, *old_table;
928 static DEFINE_SPINLOCK(rps_dev_flow_lock);
929 int rc;
930
931 if (!capable(CAP_NET_ADMIN))
932 return -EPERM;
933
934 rc = kstrtoul(buf, 0, &count);
935 if (rc < 0)
936 return rc;
937
938 if (count) {
939 mask = count - 1;
940 /* mask = roundup_pow_of_two(count) - 1;
941 * without overflows...
942 */
943 while ((mask | (mask >> 1)) != mask)
944 mask |= (mask >> 1);
945 /* On 64 bit arches, must check mask fits in table->mask (u32),
946 * and on 32bit arches, must check
947 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
948 */
949#if BITS_PER_LONG > 32
950 if (mask > (unsigned long)(u32)mask)
951 return -EINVAL;
952#else
953 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
954 / sizeof(struct rps_dev_flow)) {
955 /* Enforce a limit to prevent overflow */
956 return -EINVAL;
957 }
958#endif
959 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
960 if (!table)
961 return -ENOMEM;
962
963 table->mask = mask;
964 for (count = 0; count <= mask; count++)
965 table->flows[count].cpu = RPS_NO_CPU;
966 } else {
967 table = NULL;
968 }
969
970 spin_lock(&rps_dev_flow_lock);
971 old_table = rcu_dereference_protected(queue->rps_flow_table,
972 lockdep_is_held(&rps_dev_flow_lock));
973 rcu_assign_pointer(queue->rps_flow_table, table);
974 spin_unlock(&rps_dev_flow_lock);
975
976 if (old_table)
977 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
978
979 return len;
980}
981
982static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
983 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
984
985static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
986 = __ATTR(rps_flow_cnt, 0644,
987 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
988#endif /* CONFIG_RPS */
989
990static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
991#ifdef CONFIG_RPS
992 &rps_cpus_attribute.attr,
993 &rps_dev_flow_table_cnt_attribute.attr,
994#endif
995 NULL
996};
997ATTRIBUTE_GROUPS(rx_queue_default);
998
999static void rx_queue_release(struct kobject *kobj)
1000{
1001 struct netdev_rx_queue *queue = to_rx_queue(kobj);
1002#ifdef CONFIG_RPS
1003 struct rps_map *map;
1004 struct rps_dev_flow_table *flow_table;
1005
1006 map = rcu_dereference_protected(queue->rps_map, 1);
1007 if (map) {
1008 RCU_INIT_POINTER(queue->rps_map, NULL);
1009 kfree_rcu(map, rcu);
1010 }
1011
1012 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
1013 if (flow_table) {
1014 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
1015 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
1016 }
1017#endif
1018
1019 memset(kobj, 0, sizeof(*kobj));
1020 netdev_put(queue->dev, &queue->dev_tracker);
1021}
1022
1023static const void *rx_queue_namespace(const struct kobject *kobj)
1024{
1025 struct netdev_rx_queue *queue = to_rx_queue(kobj);
1026 struct device *dev = &queue->dev->dev;
1027 const void *ns = NULL;
1028
1029 if (dev->class && dev->class->ns_type)
1030 ns = dev->class->namespace(dev);
1031
1032 return ns;
1033}
1034
1035static void rx_queue_get_ownership(const struct kobject *kobj,
1036 kuid_t *uid, kgid_t *gid)
1037{
1038 const struct net *net = rx_queue_namespace(kobj);
1039
1040 net_ns_get_ownership(net, uid, gid);
1041}
1042
1043static struct kobj_type rx_queue_ktype __ro_after_init = {
1044 .sysfs_ops = &rx_queue_sysfs_ops,
1045 .release = rx_queue_release,
1046 .default_groups = rx_queue_default_groups,
1047 .namespace = rx_queue_namespace,
1048 .get_ownership = rx_queue_get_ownership,
1049};
1050
1051static int rx_queue_add_kobject(struct net_device *dev, int index)
1052{
1053 struct netdev_rx_queue *queue = dev->_rx + index;
1054 struct kobject *kobj = &queue->kobj;
1055 int error = 0;
1056
1057 /* Kobject_put later will trigger rx_queue_release call which
1058 * decreases dev refcount: Take that reference here
1059 */
1060 netdev_hold(queue->dev, &queue->dev_tracker, GFP_KERNEL);
1061
1062 kobj->kset = dev->queues_kset;
1063 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
1064 "rx-%u", index);
1065 if (error)
1066 goto err;
1067
1068 if (dev->sysfs_rx_queue_group) {
1069 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
1070 if (error)
1071 goto err;
1072 }
1073
1074 kobject_uevent(kobj, KOBJ_ADD);
1075
1076 return error;
1077
1078err:
1079 kobject_put(kobj);
1080 return error;
1081}
1082
1083static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
1084 kgid_t kgid)
1085{
1086 struct netdev_rx_queue *queue = dev->_rx + index;
1087 struct kobject *kobj = &queue->kobj;
1088 int error;
1089
1090 error = sysfs_change_owner(kobj, kuid, kgid);
1091 if (error)
1092 return error;
1093
1094 if (dev->sysfs_rx_queue_group)
1095 error = sysfs_group_change_owner(
1096 kobj, dev->sysfs_rx_queue_group, kuid, kgid);
1097
1098 return error;
1099}
1100#endif /* CONFIG_SYSFS */
1101
1102int
1103net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1104{
1105#ifdef CONFIG_SYSFS
1106 int i;
1107 int error = 0;
1108
1109#ifndef CONFIG_RPS
1110 if (!dev->sysfs_rx_queue_group)
1111 return 0;
1112#endif
1113 for (i = old_num; i < new_num; i++) {
1114 error = rx_queue_add_kobject(dev, i);
1115 if (error) {
1116 new_num = old_num;
1117 break;
1118 }
1119 }
1120
1121 while (--i >= new_num) {
1122 struct kobject *kobj = &dev->_rx[i].kobj;
1123
1124 if (!refcount_read(&dev_net(dev)->ns.count))
1125 kobj->uevent_suppress = 1;
1126 if (dev->sysfs_rx_queue_group)
1127 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
1128 kobject_put(kobj);
1129 }
1130
1131 return error;
1132#else
1133 return 0;
1134#endif
1135}
1136
1137static int net_rx_queue_change_owner(struct net_device *dev, int num,
1138 kuid_t kuid, kgid_t kgid)
1139{
1140#ifdef CONFIG_SYSFS
1141 int error = 0;
1142 int i;
1143
1144#ifndef CONFIG_RPS
1145 if (!dev->sysfs_rx_queue_group)
1146 return 0;
1147#endif
1148 for (i = 0; i < num; i++) {
1149 error = rx_queue_change_owner(dev, i, kuid, kgid);
1150 if (error)
1151 break;
1152 }
1153
1154 return error;
1155#else
1156 return 0;
1157#endif
1158}
1159
1160#ifdef CONFIG_SYSFS
1161/*
1162 * netdev_queue sysfs structures and functions.
1163 */
1164struct netdev_queue_attribute {
1165 struct attribute attr;
1166 ssize_t (*show)(struct netdev_queue *queue, char *buf);
1167 ssize_t (*store)(struct netdev_queue *queue,
1168 const char *buf, size_t len);
1169};
1170#define to_netdev_queue_attr(_attr) \
1171 container_of(_attr, struct netdev_queue_attribute, attr)
1172
1173#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1174
1175static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1176 struct attribute *attr, char *buf)
1177{
1178 const struct netdev_queue_attribute *attribute
1179 = to_netdev_queue_attr(attr);
1180 struct netdev_queue *queue = to_netdev_queue(kobj);
1181
1182 if (!attribute->show)
1183 return -EIO;
1184
1185 return attribute->show(queue, buf);
1186}
1187
1188static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1189 struct attribute *attr,
1190 const char *buf, size_t count)
1191{
1192 const struct netdev_queue_attribute *attribute
1193 = to_netdev_queue_attr(attr);
1194 struct netdev_queue *queue = to_netdev_queue(kobj);
1195
1196 if (!attribute->store)
1197 return -EIO;
1198
1199 return attribute->store(queue, buf, count);
1200}
1201
1202static const struct sysfs_ops netdev_queue_sysfs_ops = {
1203 .show = netdev_queue_attr_show,
1204 .store = netdev_queue_attr_store,
1205};
1206
1207static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1208{
1209 unsigned long trans_timeout = atomic_long_read(&queue->trans_timeout);
1210
1211 return sysfs_emit(buf, fmt_ulong, trans_timeout);
1212}
1213
1214static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1215{
1216 struct net_device *dev = queue->dev;
1217 unsigned int i;
1218
1219 i = queue - dev->_tx;
1220 BUG_ON(i >= dev->num_tx_queues);
1221
1222 return i;
1223}
1224
1225static ssize_t traffic_class_show(struct netdev_queue *queue,
1226 char *buf)
1227{
1228 struct net_device *dev = queue->dev;
1229 int num_tc, tc;
1230 int index;
1231
1232 if (!netif_is_multiqueue(dev))
1233 return -ENOENT;
1234
1235 if (!rtnl_trylock())
1236 return restart_syscall();
1237
1238 index = get_netdev_queue_index(queue);
1239
1240 /* If queue belongs to subordinate dev use its TC mapping */
1241 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1242
1243 num_tc = dev->num_tc;
1244 tc = netdev_txq_to_tc(dev, index);
1245
1246 rtnl_unlock();
1247
1248 if (tc < 0)
1249 return -EINVAL;
1250
1251 /* We can report the traffic class one of two ways:
1252 * Subordinate device traffic classes are reported with the traffic
1253 * class first, and then the subordinate class so for example TC0 on
1254 * subordinate device 2 will be reported as "0-2". If the queue
1255 * belongs to the root device it will be reported with just the
1256 * traffic class, so just "0" for TC 0 for example.
1257 */
1258 return num_tc < 0 ? sysfs_emit(buf, "%d%d\n", tc, num_tc) :
1259 sysfs_emit(buf, "%d\n", tc);
1260}
1261
1262#ifdef CONFIG_XPS
1263static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1264 char *buf)
1265{
1266 return sysfs_emit(buf, "%lu\n", queue->tx_maxrate);
1267}
1268
1269static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1270 const char *buf, size_t len)
1271{
1272 struct net_device *dev = queue->dev;
1273 int err, index = get_netdev_queue_index(queue);
1274 u32 rate = 0;
1275
1276 if (!capable(CAP_NET_ADMIN))
1277 return -EPERM;
1278
1279 /* The check is also done later; this helps returning early without
1280 * hitting the trylock/restart below.
1281 */
1282 if (!dev->netdev_ops->ndo_set_tx_maxrate)
1283 return -EOPNOTSUPP;
1284
1285 err = kstrtou32(buf, 10, &rate);
1286 if (err < 0)
1287 return err;
1288
1289 if (!rtnl_trylock())
1290 return restart_syscall();
1291
1292 err = -EOPNOTSUPP;
1293 if (dev->netdev_ops->ndo_set_tx_maxrate)
1294 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1295
1296 rtnl_unlock();
1297 if (!err) {
1298 queue->tx_maxrate = rate;
1299 return len;
1300 }
1301 return err;
1302}
1303
1304static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1305 = __ATTR_RW(tx_maxrate);
1306#endif
1307
1308static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1309 = __ATTR_RO(tx_timeout);
1310
1311static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1312 = __ATTR_RO(traffic_class);
1313
1314#ifdef CONFIG_BQL
1315/*
1316 * Byte queue limits sysfs structures and functions.
1317 */
1318static ssize_t bql_show(char *buf, unsigned int value)
1319{
1320 return sysfs_emit(buf, "%u\n", value);
1321}
1322
1323static ssize_t bql_set(const char *buf, const size_t count,
1324 unsigned int *pvalue)
1325{
1326 unsigned int value;
1327 int err;
1328
1329 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1330 value = DQL_MAX_LIMIT;
1331 } else {
1332 err = kstrtouint(buf, 10, &value);
1333 if (err < 0)
1334 return err;
1335 if (value > DQL_MAX_LIMIT)
1336 return -EINVAL;
1337 }
1338
1339 *pvalue = value;
1340
1341 return count;
1342}
1343
1344static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1345 char *buf)
1346{
1347 struct dql *dql = &queue->dql;
1348
1349 return sysfs_emit(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1350}
1351
1352static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1353 const char *buf, size_t len)
1354{
1355 struct dql *dql = &queue->dql;
1356 unsigned int value;
1357 int err;
1358
1359 err = kstrtouint(buf, 10, &value);
1360 if (err < 0)
1361 return err;
1362
1363 dql->slack_hold_time = msecs_to_jiffies(value);
1364
1365 return len;
1366}
1367
1368static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1369 = __ATTR(hold_time, 0644,
1370 bql_show_hold_time, bql_set_hold_time);
1371
1372static ssize_t bql_show_inflight(struct netdev_queue *queue,
1373 char *buf)
1374{
1375 struct dql *dql = &queue->dql;
1376
1377 return sysfs_emit(buf, "%u\n", dql->num_queued - dql->num_completed);
1378}
1379
1380static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1381 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1382
1383#define BQL_ATTR(NAME, FIELD) \
1384static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1385 char *buf) \
1386{ \
1387 return bql_show(buf, queue->dql.FIELD); \
1388} \
1389 \
1390static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1391 const char *buf, size_t len) \
1392{ \
1393 return bql_set(buf, len, &queue->dql.FIELD); \
1394} \
1395 \
1396static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1397 = __ATTR(NAME, 0644, \
1398 bql_show_ ## NAME, bql_set_ ## NAME)
1399
1400BQL_ATTR(limit, limit);
1401BQL_ATTR(limit_max, max_limit);
1402BQL_ATTR(limit_min, min_limit);
1403
1404static struct attribute *dql_attrs[] __ro_after_init = {
1405 &bql_limit_attribute.attr,
1406 &bql_limit_max_attribute.attr,
1407 &bql_limit_min_attribute.attr,
1408 &bql_hold_time_attribute.attr,
1409 &bql_inflight_attribute.attr,
1410 NULL
1411};
1412
1413static const struct attribute_group dql_group = {
1414 .name = "byte_queue_limits",
1415 .attrs = dql_attrs,
1416};
1417#endif /* CONFIG_BQL */
1418
1419#ifdef CONFIG_XPS
1420static ssize_t xps_queue_show(struct net_device *dev, unsigned int index,
1421 int tc, char *buf, enum xps_map_type type)
1422{
1423 struct xps_dev_maps *dev_maps;
1424 unsigned long *mask;
1425 unsigned int nr_ids;
1426 int j, len;
1427
1428 rcu_read_lock();
1429 dev_maps = rcu_dereference(dev->xps_maps[type]);
1430
1431 /* Default to nr_cpu_ids/dev->num_rx_queues and do not just return 0
1432 * when dev_maps hasn't been allocated yet, to be backward compatible.
1433 */
1434 nr_ids = dev_maps ? dev_maps->nr_ids :
1435 (type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues);
1436
1437 mask = bitmap_zalloc(nr_ids, GFP_NOWAIT);
1438 if (!mask) {
1439 rcu_read_unlock();
1440 return -ENOMEM;
1441 }
1442
1443 if (!dev_maps || tc >= dev_maps->num_tc)
1444 goto out_no_maps;
1445
1446 for (j = 0; j < nr_ids; j++) {
1447 int i, tci = j * dev_maps->num_tc + tc;
1448 struct xps_map *map;
1449
1450 map = rcu_dereference(dev_maps->attr_map[tci]);
1451 if (!map)
1452 continue;
1453
1454 for (i = map->len; i--;) {
1455 if (map->queues[i] == index) {
1456 __set_bit(j, mask);
1457 break;
1458 }
1459 }
1460 }
1461out_no_maps:
1462 rcu_read_unlock();
1463
1464 len = bitmap_print_to_pagebuf(false, buf, mask, nr_ids);
1465 bitmap_free(mask);
1466
1467 return len < PAGE_SIZE ? len : -EINVAL;
1468}
1469
1470static ssize_t xps_cpus_show(struct netdev_queue *queue, char *buf)
1471{
1472 struct net_device *dev = queue->dev;
1473 unsigned int index;
1474 int len, tc;
1475
1476 if (!netif_is_multiqueue(dev))
1477 return -ENOENT;
1478
1479 index = get_netdev_queue_index(queue);
1480
1481 if (!rtnl_trylock())
1482 return restart_syscall();
1483
1484 /* If queue belongs to subordinate dev use its map */
1485 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1486
1487 tc = netdev_txq_to_tc(dev, index);
1488 if (tc < 0) {
1489 rtnl_unlock();
1490 return -EINVAL;
1491 }
1492
1493 /* Make sure the subordinate device can't be freed */
1494 get_device(&dev->dev);
1495 rtnl_unlock();
1496
1497 len = xps_queue_show(dev, index, tc, buf, XPS_CPUS);
1498
1499 put_device(&dev->dev);
1500 return len;
1501}
1502
1503static ssize_t xps_cpus_store(struct netdev_queue *queue,
1504 const char *buf, size_t len)
1505{
1506 struct net_device *dev = queue->dev;
1507 unsigned int index;
1508 cpumask_var_t mask;
1509 int err;
1510
1511 if (!netif_is_multiqueue(dev))
1512 return -ENOENT;
1513
1514 if (!capable(CAP_NET_ADMIN))
1515 return -EPERM;
1516
1517 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1518 return -ENOMEM;
1519
1520 index = get_netdev_queue_index(queue);
1521
1522 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1523 if (err) {
1524 free_cpumask_var(mask);
1525 return err;
1526 }
1527
1528 if (!rtnl_trylock()) {
1529 free_cpumask_var(mask);
1530 return restart_syscall();
1531 }
1532
1533 err = netif_set_xps_queue(dev, mask, index);
1534 rtnl_unlock();
1535
1536 free_cpumask_var(mask);
1537
1538 return err ? : len;
1539}
1540
1541static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1542 = __ATTR_RW(xps_cpus);
1543
1544static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1545{
1546 struct net_device *dev = queue->dev;
1547 unsigned int index;
1548 int tc;
1549
1550 index = get_netdev_queue_index(queue);
1551
1552 if (!rtnl_trylock())
1553 return restart_syscall();
1554
1555 tc = netdev_txq_to_tc(dev, index);
1556 rtnl_unlock();
1557 if (tc < 0)
1558 return -EINVAL;
1559
1560 return xps_queue_show(dev, index, tc, buf, XPS_RXQS);
1561}
1562
1563static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1564 size_t len)
1565{
1566 struct net_device *dev = queue->dev;
1567 struct net *net = dev_net(dev);
1568 unsigned long *mask;
1569 unsigned int index;
1570 int err;
1571
1572 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1573 return -EPERM;
1574
1575 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1576 if (!mask)
1577 return -ENOMEM;
1578
1579 index = get_netdev_queue_index(queue);
1580
1581 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1582 if (err) {
1583 bitmap_free(mask);
1584 return err;
1585 }
1586
1587 if (!rtnl_trylock()) {
1588 bitmap_free(mask);
1589 return restart_syscall();
1590 }
1591
1592 cpus_read_lock();
1593 err = __netif_set_xps_queue(dev, mask, index, XPS_RXQS);
1594 cpus_read_unlock();
1595
1596 rtnl_unlock();
1597
1598 bitmap_free(mask);
1599 return err ? : len;
1600}
1601
1602static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1603 = __ATTR_RW(xps_rxqs);
1604#endif /* CONFIG_XPS */
1605
1606static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1607 &queue_trans_timeout.attr,
1608 &queue_traffic_class.attr,
1609#ifdef CONFIG_XPS
1610 &xps_cpus_attribute.attr,
1611 &xps_rxqs_attribute.attr,
1612 &queue_tx_maxrate.attr,
1613#endif
1614 NULL
1615};
1616ATTRIBUTE_GROUPS(netdev_queue_default);
1617
1618static void netdev_queue_release(struct kobject *kobj)
1619{
1620 struct netdev_queue *queue = to_netdev_queue(kobj);
1621
1622 memset(kobj, 0, sizeof(*kobj));
1623 netdev_put(queue->dev, &queue->dev_tracker);
1624}
1625
1626static const void *netdev_queue_namespace(const struct kobject *kobj)
1627{
1628 struct netdev_queue *queue = to_netdev_queue(kobj);
1629 struct device *dev = &queue->dev->dev;
1630 const void *ns = NULL;
1631
1632 if (dev->class && dev->class->ns_type)
1633 ns = dev->class->namespace(dev);
1634
1635 return ns;
1636}
1637
1638static void netdev_queue_get_ownership(const struct kobject *kobj,
1639 kuid_t *uid, kgid_t *gid)
1640{
1641 const struct net *net = netdev_queue_namespace(kobj);
1642
1643 net_ns_get_ownership(net, uid, gid);
1644}
1645
1646static struct kobj_type netdev_queue_ktype __ro_after_init = {
1647 .sysfs_ops = &netdev_queue_sysfs_ops,
1648 .release = netdev_queue_release,
1649 .default_groups = netdev_queue_default_groups,
1650 .namespace = netdev_queue_namespace,
1651 .get_ownership = netdev_queue_get_ownership,
1652};
1653
1654static int netdev_queue_add_kobject(struct net_device *dev, int index)
1655{
1656 struct netdev_queue *queue = dev->_tx + index;
1657 struct kobject *kobj = &queue->kobj;
1658 int error = 0;
1659
1660 /* Kobject_put later will trigger netdev_queue_release call
1661 * which decreases dev refcount: Take that reference here
1662 */
1663 netdev_hold(queue->dev, &queue->dev_tracker, GFP_KERNEL);
1664
1665 kobj->kset = dev->queues_kset;
1666 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1667 "tx-%u", index);
1668 if (error)
1669 goto err;
1670
1671#ifdef CONFIG_BQL
1672 error = sysfs_create_group(kobj, &dql_group);
1673 if (error)
1674 goto err;
1675#endif
1676
1677 kobject_uevent(kobj, KOBJ_ADD);
1678 return 0;
1679
1680err:
1681 kobject_put(kobj);
1682 return error;
1683}
1684
1685static int tx_queue_change_owner(struct net_device *ndev, int index,
1686 kuid_t kuid, kgid_t kgid)
1687{
1688 struct netdev_queue *queue = ndev->_tx + index;
1689 struct kobject *kobj = &queue->kobj;
1690 int error;
1691
1692 error = sysfs_change_owner(kobj, kuid, kgid);
1693 if (error)
1694 return error;
1695
1696#ifdef CONFIG_BQL
1697 error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
1698#endif
1699 return error;
1700}
1701#endif /* CONFIG_SYSFS */
1702
1703int
1704netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1705{
1706#ifdef CONFIG_SYSFS
1707 int i;
1708 int error = 0;
1709
1710 /* Tx queue kobjects are allowed to be updated when a device is being
1711 * unregistered, but solely to remove queues from qdiscs. Any path
1712 * adding queues should be fixed.
1713 */
1714 WARN(dev->reg_state == NETREG_UNREGISTERING && new_num > old_num,
1715 "New queues can't be registered after device unregistration.");
1716
1717 for (i = old_num; i < new_num; i++) {
1718 error = netdev_queue_add_kobject(dev, i);
1719 if (error) {
1720 new_num = old_num;
1721 break;
1722 }
1723 }
1724
1725 while (--i >= new_num) {
1726 struct netdev_queue *queue = dev->_tx + i;
1727
1728 if (!refcount_read(&dev_net(dev)->ns.count))
1729 queue->kobj.uevent_suppress = 1;
1730#ifdef CONFIG_BQL
1731 sysfs_remove_group(&queue->kobj, &dql_group);
1732#endif
1733 kobject_put(&queue->kobj);
1734 }
1735
1736 return error;
1737#else
1738 return 0;
1739#endif /* CONFIG_SYSFS */
1740}
1741
1742static int net_tx_queue_change_owner(struct net_device *dev, int num,
1743 kuid_t kuid, kgid_t kgid)
1744{
1745#ifdef CONFIG_SYSFS
1746 int error = 0;
1747 int i;
1748
1749 for (i = 0; i < num; i++) {
1750 error = tx_queue_change_owner(dev, i, kuid, kgid);
1751 if (error)
1752 break;
1753 }
1754
1755 return error;
1756#else
1757 return 0;
1758#endif /* CONFIG_SYSFS */
1759}
1760
1761static int register_queue_kobjects(struct net_device *dev)
1762{
1763 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1764
1765#ifdef CONFIG_SYSFS
1766 dev->queues_kset = kset_create_and_add("queues",
1767 NULL, &dev->dev.kobj);
1768 if (!dev->queues_kset)
1769 return -ENOMEM;
1770 real_rx = dev->real_num_rx_queues;
1771#endif
1772 real_tx = dev->real_num_tx_queues;
1773
1774 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1775 if (error)
1776 goto error;
1777 rxq = real_rx;
1778
1779 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1780 if (error)
1781 goto error;
1782 txq = real_tx;
1783
1784 return 0;
1785
1786error:
1787 netdev_queue_update_kobjects(dev, txq, 0);
1788 net_rx_queue_update_kobjects(dev, rxq, 0);
1789#ifdef CONFIG_SYSFS
1790 kset_unregister(dev->queues_kset);
1791#endif
1792 return error;
1793}
1794
1795static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
1796{
1797 int error = 0, real_rx = 0, real_tx = 0;
1798
1799#ifdef CONFIG_SYSFS
1800 if (ndev->queues_kset) {
1801 error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
1802 if (error)
1803 return error;
1804 }
1805 real_rx = ndev->real_num_rx_queues;
1806#endif
1807 real_tx = ndev->real_num_tx_queues;
1808
1809 error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
1810 if (error)
1811 return error;
1812
1813 error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
1814 if (error)
1815 return error;
1816
1817 return 0;
1818}
1819
1820static void remove_queue_kobjects(struct net_device *dev)
1821{
1822 int real_rx = 0, real_tx = 0;
1823
1824#ifdef CONFIG_SYSFS
1825 real_rx = dev->real_num_rx_queues;
1826#endif
1827 real_tx = dev->real_num_tx_queues;
1828
1829 net_rx_queue_update_kobjects(dev, real_rx, 0);
1830 netdev_queue_update_kobjects(dev, real_tx, 0);
1831
1832 dev->real_num_rx_queues = 0;
1833 dev->real_num_tx_queues = 0;
1834#ifdef CONFIG_SYSFS
1835 kset_unregister(dev->queues_kset);
1836#endif
1837}
1838
1839static bool net_current_may_mount(void)
1840{
1841 struct net *net = current->nsproxy->net_ns;
1842
1843 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1844}
1845
1846static void *net_grab_current_ns(void)
1847{
1848 struct net *ns = current->nsproxy->net_ns;
1849#ifdef CONFIG_NET_NS
1850 if (ns)
1851 refcount_inc(&ns->passive);
1852#endif
1853 return ns;
1854}
1855
1856static const void *net_initial_ns(void)
1857{
1858 return &init_net;
1859}
1860
1861static const void *net_netlink_ns(struct sock *sk)
1862{
1863 return sock_net(sk);
1864}
1865
1866const struct kobj_ns_type_operations net_ns_type_operations = {
1867 .type = KOBJ_NS_TYPE_NET,
1868 .current_may_mount = net_current_may_mount,
1869 .grab_current_ns = net_grab_current_ns,
1870 .netlink_ns = net_netlink_ns,
1871 .initial_ns = net_initial_ns,
1872 .drop_ns = net_drop_ns,
1873};
1874EXPORT_SYMBOL_GPL(net_ns_type_operations);
1875
1876static int netdev_uevent(const struct device *d, struct kobj_uevent_env *env)
1877{
1878 const struct net_device *dev = to_net_dev(d);
1879 int retval;
1880
1881 /* pass interface to uevent. */
1882 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1883 if (retval)
1884 goto exit;
1885
1886 /* pass ifindex to uevent.
1887 * ifindex is useful as it won't change (interface name may change)
1888 * and is what RtNetlink uses natively.
1889 */
1890 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1891
1892exit:
1893 return retval;
1894}
1895
1896/*
1897 * netdev_release -- destroy and free a dead device.
1898 * Called when last reference to device kobject is gone.
1899 */
1900static void netdev_release(struct device *d)
1901{
1902 struct net_device *dev = to_net_dev(d);
1903
1904 BUG_ON(dev->reg_state != NETREG_RELEASED);
1905
1906 /* no need to wait for rcu grace period:
1907 * device is dead and about to be freed.
1908 */
1909 kfree(rcu_access_pointer(dev->ifalias));
1910 netdev_freemem(dev);
1911}
1912
1913static const void *net_namespace(const struct device *d)
1914{
1915 const struct net_device *dev = to_net_dev(d);
1916
1917 return dev_net(dev);
1918}
1919
1920static void net_get_ownership(const struct device *d, kuid_t *uid, kgid_t *gid)
1921{
1922 const struct net_device *dev = to_net_dev(d);
1923 const struct net *net = dev_net(dev);
1924
1925 net_ns_get_ownership(net, uid, gid);
1926}
1927
1928static struct class net_class __ro_after_init = {
1929 .name = "net",
1930 .dev_release = netdev_release,
1931 .dev_groups = net_class_groups,
1932 .dev_uevent = netdev_uevent,
1933 .ns_type = &net_ns_type_operations,
1934 .namespace = net_namespace,
1935 .get_ownership = net_get_ownership,
1936};
1937
1938#ifdef CONFIG_OF
1939static int of_dev_node_match(struct device *dev, const void *data)
1940{
1941 for (; dev; dev = dev->parent) {
1942 if (dev->of_node == data)
1943 return 1;
1944 }
1945
1946 return 0;
1947}
1948
1949/*
1950 * of_find_net_device_by_node - lookup the net device for the device node
1951 * @np: OF device node
1952 *
1953 * Looks up the net_device structure corresponding with the device node.
1954 * If successful, returns a pointer to the net_device with the embedded
1955 * struct device refcount incremented by one, or NULL on failure. The
1956 * refcount must be dropped when done with the net_device.
1957 */
1958struct net_device *of_find_net_device_by_node(struct device_node *np)
1959{
1960 struct device *dev;
1961
1962 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1963 if (!dev)
1964 return NULL;
1965
1966 return to_net_dev(dev);
1967}
1968EXPORT_SYMBOL(of_find_net_device_by_node);
1969#endif
1970
1971/* Delete sysfs entries but hold kobject reference until after all
1972 * netdev references are gone.
1973 */
1974void netdev_unregister_kobject(struct net_device *ndev)
1975{
1976 struct device *dev = &ndev->dev;
1977
1978 if (!refcount_read(&dev_net(ndev)->ns.count))
1979 dev_set_uevent_suppress(dev, 1);
1980
1981 kobject_get(&dev->kobj);
1982
1983 remove_queue_kobjects(ndev);
1984
1985 pm_runtime_set_memalloc_noio(dev, false);
1986
1987 device_del(dev);
1988}
1989
1990/* Create sysfs entries for network device. */
1991int netdev_register_kobject(struct net_device *ndev)
1992{
1993 struct device *dev = &ndev->dev;
1994 const struct attribute_group **groups = ndev->sysfs_groups;
1995 int error = 0;
1996
1997 device_initialize(dev);
1998 dev->class = &net_class;
1999 dev->platform_data = ndev;
2000 dev->groups = groups;
2001
2002 dev_set_name(dev, "%s", ndev->name);
2003
2004#ifdef CONFIG_SYSFS
2005 /* Allow for a device specific group */
2006 if (*groups)
2007 groups++;
2008
2009 *groups++ = &netstat_group;
2010
2011 if (wireless_group_needed(ndev))
2012 *groups++ = &wireless_group;
2013#endif /* CONFIG_SYSFS */
2014
2015 error = device_add(dev);
2016 if (error)
2017 return error;
2018
2019 error = register_queue_kobjects(ndev);
2020 if (error) {
2021 device_del(dev);
2022 return error;
2023 }
2024
2025 pm_runtime_set_memalloc_noio(dev, true);
2026
2027 return error;
2028}
2029
2030/* Change owner for sysfs entries when moving network devices across network
2031 * namespaces owned by different user namespaces.
2032 */
2033int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
2034 const struct net *net_new)
2035{
2036 kuid_t old_uid = GLOBAL_ROOT_UID, new_uid = GLOBAL_ROOT_UID;
2037 kgid_t old_gid = GLOBAL_ROOT_GID, new_gid = GLOBAL_ROOT_GID;
2038 struct device *dev = &ndev->dev;
2039 int error;
2040
2041 net_ns_get_ownership(net_old, &old_uid, &old_gid);
2042 net_ns_get_ownership(net_new, &new_uid, &new_gid);
2043
2044 /* The network namespace was changed but the owning user namespace is
2045 * identical so there's no need to change the owner of sysfs entries.
2046 */
2047 if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid))
2048 return 0;
2049
2050 error = device_change_owner(dev, new_uid, new_gid);
2051 if (error)
2052 return error;
2053
2054 error = queue_change_owner(ndev, new_uid, new_gid);
2055 if (error)
2056 return error;
2057
2058 return 0;
2059}
2060
2061int netdev_class_create_file_ns(const struct class_attribute *class_attr,
2062 const void *ns)
2063{
2064 return class_create_file_ns(&net_class, class_attr, ns);
2065}
2066EXPORT_SYMBOL(netdev_class_create_file_ns);
2067
2068void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
2069 const void *ns)
2070{
2071 class_remove_file_ns(&net_class, class_attr, ns);
2072}
2073EXPORT_SYMBOL(netdev_class_remove_file_ns);
2074
2075int __init netdev_kobject_init(void)
2076{
2077 kobj_ns_type_register(&net_ns_type_operations);
2078 return class_register(&net_class);
2079}