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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#include <net/netdev_rx_queue.h>
27#include <net/rps.h>
28
29#include "dev.h"
30#include "net-sysfs.h"
31
32#ifdef CONFIG_SYSFS
33static const char fmt_hex[] = "%#x\n";
34static const char fmt_dec[] = "%d\n";
35static const char fmt_uint[] = "%u\n";
36static const char fmt_ulong[] = "%lu\n";
37static const char fmt_u64[] = "%llu\n";
38
39/* Caller holds RTNL or RCU */
40static inline int dev_isalive(const struct net_device *dev)
41{
42 return READ_ONCE(dev->reg_state) <= NETREG_REGISTERED;
43}
44
45/* use same locking rules as GIF* ioctl's */
46static ssize_t netdev_show(const struct device *dev,
47 struct device_attribute *attr, char *buf,
48 ssize_t (*format)(const struct net_device *, char *))
49{
50 struct net_device *ndev = to_net_dev(dev);
51 ssize_t ret = -EINVAL;
52
53 rcu_read_lock();
54 if (dev_isalive(ndev))
55 ret = (*format)(ndev, buf);
56 rcu_read_unlock();
57
58 return ret;
59}
60
61/* generate a show function for simple field */
62#define NETDEVICE_SHOW(field, format_string) \
63static ssize_t format_##field(const struct net_device *dev, char *buf) \
64{ \
65 return sysfs_emit(buf, format_string, READ_ONCE(dev->field)); \
66} \
67static ssize_t field##_show(struct device *dev, \
68 struct device_attribute *attr, char *buf) \
69{ \
70 return netdev_show(dev, attr, buf, format_##field); \
71} \
72
73#define NETDEVICE_SHOW_RO(field, format_string) \
74NETDEVICE_SHOW(field, format_string); \
75static DEVICE_ATTR_RO(field)
76
77#define NETDEVICE_SHOW_RW(field, format_string) \
78NETDEVICE_SHOW(field, format_string); \
79static DEVICE_ATTR_RW(field)
80
81/* use same locking and permission rules as SIF* ioctl's */
82static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
83 const char *buf, size_t len,
84 int (*set)(struct net_device *, unsigned long))
85{
86 struct net_device *netdev = to_net_dev(dev);
87 struct net *net = dev_net(netdev);
88 unsigned long new;
89 int ret;
90
91 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
92 return -EPERM;
93
94 ret = kstrtoul(buf, 0, &new);
95 if (ret)
96 goto err;
97
98 if (!rtnl_trylock())
99 return restart_syscall();
100
101 if (dev_isalive(netdev)) {
102 ret = (*set)(netdev, new);
103 if (ret == 0)
104 ret = len;
105 }
106 rtnl_unlock();
107 err:
108 return ret;
109}
110
111NETDEVICE_SHOW_RO(dev_id, fmt_hex);
112NETDEVICE_SHOW_RO(dev_port, fmt_dec);
113NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
114NETDEVICE_SHOW_RO(addr_len, fmt_dec);
115NETDEVICE_SHOW_RO(ifindex, fmt_dec);
116NETDEVICE_SHOW_RO(type, fmt_dec);
117NETDEVICE_SHOW_RO(link_mode, fmt_dec);
118
119static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
120 char *buf)
121{
122 struct net_device *ndev = to_net_dev(dev);
123
124 return sysfs_emit(buf, fmt_dec, dev_get_iflink(ndev));
125}
126static DEVICE_ATTR_RO(iflink);
127
128static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
129{
130 return sysfs_emit(buf, fmt_dec, READ_ONCE(dev->name_assign_type));
131}
132
133static ssize_t name_assign_type_show(struct device *dev,
134 struct device_attribute *attr,
135 char *buf)
136{
137 struct net_device *ndev = to_net_dev(dev);
138 ssize_t ret = -EINVAL;
139
140 if (READ_ONCE(ndev->name_assign_type) != NET_NAME_UNKNOWN)
141 ret = netdev_show(dev, attr, buf, format_name_assign_type);
142
143 return ret;
144}
145static DEVICE_ATTR_RO(name_assign_type);
146
147/* use same locking rules as GIFHWADDR ioctl's (dev_get_mac_address()) */
148static ssize_t address_show(struct device *dev, struct device_attribute *attr,
149 char *buf)
150{
151 struct net_device *ndev = to_net_dev(dev);
152 ssize_t ret = -EINVAL;
153
154 down_read(&dev_addr_sem);
155
156 rcu_read_lock();
157 if (dev_isalive(ndev))
158 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
159 rcu_read_unlock();
160
161 up_read(&dev_addr_sem);
162 return ret;
163}
164static DEVICE_ATTR_RO(address);
165
166static ssize_t broadcast_show(struct device *dev,
167 struct device_attribute *attr, char *buf)
168{
169 struct net_device *ndev = to_net_dev(dev);
170 int ret = -EINVAL;
171
172 rcu_read_lock();
173 if (dev_isalive(ndev))
174 ret = sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
175 rcu_read_unlock();
176 return ret;
177}
178static DEVICE_ATTR_RO(broadcast);
179
180static int change_carrier(struct net_device *dev, unsigned long new_carrier)
181{
182 if (!netif_running(dev))
183 return -EINVAL;
184 return dev_change_carrier(dev, (bool)new_carrier);
185}
186
187static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
188 const char *buf, size_t len)
189{
190 struct net_device *netdev = to_net_dev(dev);
191
192 /* The check is also done in change_carrier; this helps returning early
193 * without hitting the trylock/restart in netdev_store.
194 */
195 if (!netdev->netdev_ops->ndo_change_carrier)
196 return -EOPNOTSUPP;
197
198 return netdev_store(dev, attr, buf, len, change_carrier);
199}
200
201static ssize_t carrier_show(struct device *dev,
202 struct device_attribute *attr, char *buf)
203{
204 struct net_device *netdev = to_net_dev(dev);
205 int ret = -EINVAL;
206
207 if (!rtnl_trylock())
208 return restart_syscall();
209
210 if (netif_running(netdev)) {
211 /* Synchronize carrier state with link watch,
212 * see also rtnl_getlink().
213 */
214 linkwatch_sync_dev(netdev);
215
216 ret = sysfs_emit(buf, fmt_dec, !!netif_carrier_ok(netdev));
217 }
218 rtnl_unlock();
219
220 return ret;
221}
222static DEVICE_ATTR_RW(carrier);
223
224static ssize_t speed_show(struct device *dev,
225 struct device_attribute *attr, char *buf)
226{
227 struct net_device *netdev = to_net_dev(dev);
228 int ret = -EINVAL;
229
230 /* The check is also done in __ethtool_get_link_ksettings; this helps
231 * returning early without hitting the trylock/restart below.
232 */
233 if (!netdev->ethtool_ops->get_link_ksettings)
234 return ret;
235
236 if (!rtnl_trylock())
237 return restart_syscall();
238
239 if (netif_running(netdev)) {
240 struct ethtool_link_ksettings cmd;
241
242 if (!__ethtool_get_link_ksettings(netdev, &cmd))
243 ret = sysfs_emit(buf, fmt_dec, cmd.base.speed);
244 }
245 rtnl_unlock();
246 return ret;
247}
248static DEVICE_ATTR_RO(speed);
249
250static ssize_t duplex_show(struct device *dev,
251 struct device_attribute *attr, char *buf)
252{
253 struct net_device *netdev = to_net_dev(dev);
254 int ret = -EINVAL;
255
256 /* The check is also done in __ethtool_get_link_ksettings; this helps
257 * returning early without hitting the trylock/restart below.
258 */
259 if (!netdev->ethtool_ops->get_link_ksettings)
260 return ret;
261
262 if (!rtnl_trylock())
263 return restart_syscall();
264
265 if (netif_running(netdev)) {
266 struct ethtool_link_ksettings cmd;
267
268 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
269 const char *duplex;
270
271 switch (cmd.base.duplex) {
272 case DUPLEX_HALF:
273 duplex = "half";
274 break;
275 case DUPLEX_FULL:
276 duplex = "full";
277 break;
278 default:
279 duplex = "unknown";
280 break;
281 }
282 ret = sysfs_emit(buf, "%s\n", duplex);
283 }
284 }
285 rtnl_unlock();
286 return ret;
287}
288static DEVICE_ATTR_RO(duplex);
289
290static ssize_t testing_show(struct device *dev,
291 struct device_attribute *attr, char *buf)
292{
293 struct net_device *netdev = to_net_dev(dev);
294
295 if (netif_running(netdev))
296 return sysfs_emit(buf, fmt_dec, !!netif_testing(netdev));
297
298 return -EINVAL;
299}
300static DEVICE_ATTR_RO(testing);
301
302static ssize_t dormant_show(struct device *dev,
303 struct device_attribute *attr, char *buf)
304{
305 struct net_device *netdev = to_net_dev(dev);
306
307 if (netif_running(netdev))
308 return sysfs_emit(buf, fmt_dec, !!netif_dormant(netdev));
309
310 return -EINVAL;
311}
312static DEVICE_ATTR_RO(dormant);
313
314static const char *const operstates[] = {
315 "unknown",
316 "notpresent", /* currently unused */
317 "down",
318 "lowerlayerdown",
319 "testing",
320 "dormant",
321 "up"
322};
323
324static ssize_t operstate_show(struct device *dev,
325 struct device_attribute *attr, char *buf)
326{
327 const struct net_device *netdev = to_net_dev(dev);
328 unsigned char operstate;
329
330 operstate = READ_ONCE(netdev->operstate);
331 if (!netif_running(netdev))
332 operstate = IF_OPER_DOWN;
333
334 if (operstate >= ARRAY_SIZE(operstates))
335 return -EINVAL; /* should not happen */
336
337 return sysfs_emit(buf, "%s\n", operstates[operstate]);
338}
339static DEVICE_ATTR_RO(operstate);
340
341static ssize_t carrier_changes_show(struct device *dev,
342 struct device_attribute *attr,
343 char *buf)
344{
345 struct net_device *netdev = to_net_dev(dev);
346
347 return sysfs_emit(buf, fmt_dec,
348 atomic_read(&netdev->carrier_up_count) +
349 atomic_read(&netdev->carrier_down_count));
350}
351static DEVICE_ATTR_RO(carrier_changes);
352
353static ssize_t carrier_up_count_show(struct device *dev,
354 struct device_attribute *attr,
355 char *buf)
356{
357 struct net_device *netdev = to_net_dev(dev);
358
359 return sysfs_emit(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
360}
361static DEVICE_ATTR_RO(carrier_up_count);
362
363static ssize_t carrier_down_count_show(struct device *dev,
364 struct device_attribute *attr,
365 char *buf)
366{
367 struct net_device *netdev = to_net_dev(dev);
368
369 return sysfs_emit(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
370}
371static DEVICE_ATTR_RO(carrier_down_count);
372
373/* read-write attributes */
374
375static int change_mtu(struct net_device *dev, unsigned long new_mtu)
376{
377 return dev_set_mtu(dev, (int)new_mtu);
378}
379
380static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
381 const char *buf, size_t len)
382{
383 return netdev_store(dev, attr, buf, len, change_mtu);
384}
385NETDEVICE_SHOW_RW(mtu, fmt_dec);
386
387static int change_flags(struct net_device *dev, unsigned long new_flags)
388{
389 return dev_change_flags(dev, (unsigned int)new_flags, NULL);
390}
391
392static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
393 const char *buf, size_t len)
394{
395 return netdev_store(dev, attr, buf, len, change_flags);
396}
397NETDEVICE_SHOW_RW(flags, fmt_hex);
398
399static ssize_t tx_queue_len_store(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf, size_t len)
402{
403 if (!capable(CAP_NET_ADMIN))
404 return -EPERM;
405
406 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
407}
408NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
409
410static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
411{
412 netdev_set_gro_flush_timeout(dev, val);
413 return 0;
414}
415
416static ssize_t gro_flush_timeout_store(struct device *dev,
417 struct device_attribute *attr,
418 const char *buf, size_t len)
419{
420 if (!capable(CAP_NET_ADMIN))
421 return -EPERM;
422
423 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
424}
425NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
426
427static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val)
428{
429 if (val > S32_MAX)
430 return -ERANGE;
431
432 netdev_set_defer_hard_irqs(dev, (u32)val);
433 return 0;
434}
435
436static ssize_t napi_defer_hard_irqs_store(struct device *dev,
437 struct device_attribute *attr,
438 const char *buf, size_t len)
439{
440 if (!capable(CAP_NET_ADMIN))
441 return -EPERM;
442
443 return netdev_store(dev, attr, buf, len, change_napi_defer_hard_irqs);
444}
445NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_uint);
446
447static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
448 const char *buf, size_t len)
449{
450 struct net_device *netdev = to_net_dev(dev);
451 struct net *net = dev_net(netdev);
452 size_t count = len;
453 ssize_t ret = 0;
454
455 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
456 return -EPERM;
457
458 /* ignore trailing newline */
459 if (len > 0 && buf[len - 1] == '\n')
460 --count;
461
462 if (!rtnl_trylock())
463 return restart_syscall();
464
465 if (dev_isalive(netdev)) {
466 ret = dev_set_alias(netdev, buf, count);
467 if (ret < 0)
468 goto err;
469 ret = len;
470 netdev_state_change(netdev);
471 }
472err:
473 rtnl_unlock();
474
475 return ret;
476}
477
478static ssize_t ifalias_show(struct device *dev,
479 struct device_attribute *attr, char *buf)
480{
481 const struct net_device *netdev = to_net_dev(dev);
482 char tmp[IFALIASZ];
483 ssize_t ret = 0;
484
485 ret = dev_get_alias(netdev, tmp, sizeof(tmp));
486 if (ret > 0)
487 ret = sysfs_emit(buf, "%s\n", tmp);
488 return ret;
489}
490static DEVICE_ATTR_RW(ifalias);
491
492static int change_group(struct net_device *dev, unsigned long new_group)
493{
494 dev_set_group(dev, (int)new_group);
495 return 0;
496}
497
498static ssize_t group_store(struct device *dev, struct device_attribute *attr,
499 const char *buf, size_t len)
500{
501 return netdev_store(dev, attr, buf, len, change_group);
502}
503NETDEVICE_SHOW(group, fmt_dec);
504static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
505
506static int change_proto_down(struct net_device *dev, unsigned long proto_down)
507{
508 return dev_change_proto_down(dev, (bool)proto_down);
509}
510
511static ssize_t proto_down_store(struct device *dev,
512 struct device_attribute *attr,
513 const char *buf, size_t len)
514{
515 return netdev_store(dev, attr, buf, len, change_proto_down);
516}
517NETDEVICE_SHOW_RW(proto_down, fmt_dec);
518
519static ssize_t phys_port_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 /* The check is also done in dev_get_phys_port_id; this helps returning
526 * early without hitting the trylock/restart below.
527 */
528 if (!netdev->netdev_ops->ndo_get_phys_port_id)
529 return -EOPNOTSUPP;
530
531 if (!rtnl_trylock())
532 return restart_syscall();
533
534 if (dev_isalive(netdev)) {
535 struct netdev_phys_item_id ppid;
536
537 ret = dev_get_phys_port_id(netdev, &ppid);
538 if (!ret)
539 ret = sysfs_emit(buf, "%*phN\n", ppid.id_len, ppid.id);
540 }
541 rtnl_unlock();
542
543 return ret;
544}
545static DEVICE_ATTR_RO(phys_port_id);
546
547static ssize_t phys_port_name_show(struct device *dev,
548 struct device_attribute *attr, char *buf)
549{
550 struct net_device *netdev = to_net_dev(dev);
551 ssize_t ret = -EINVAL;
552
553 /* The checks are also done in dev_get_phys_port_name; this helps
554 * returning early without hitting the trylock/restart below.
555 */
556 if (!netdev->netdev_ops->ndo_get_phys_port_name &&
557 !netdev->devlink_port)
558 return -EOPNOTSUPP;
559
560 if (!rtnl_trylock())
561 return restart_syscall();
562
563 if (dev_isalive(netdev)) {
564 char name[IFNAMSIZ];
565
566 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
567 if (!ret)
568 ret = sysfs_emit(buf, "%s\n", name);
569 }
570 rtnl_unlock();
571
572 return ret;
573}
574static DEVICE_ATTR_RO(phys_port_name);
575
576static ssize_t phys_switch_id_show(struct device *dev,
577 struct device_attribute *attr, char *buf)
578{
579 struct net_device *netdev = to_net_dev(dev);
580 ssize_t ret = -EINVAL;
581
582 /* The checks are also done in dev_get_phys_port_name; this helps
583 * returning early without hitting the trylock/restart below. This works
584 * because recurse is false when calling dev_get_port_parent_id.
585 */
586 if (!netdev->netdev_ops->ndo_get_port_parent_id &&
587 !netdev->devlink_port)
588 return -EOPNOTSUPP;
589
590 if (!rtnl_trylock())
591 return restart_syscall();
592
593 if (dev_isalive(netdev)) {
594 struct netdev_phys_item_id ppid = { };
595
596 ret = dev_get_port_parent_id(netdev, &ppid, false);
597 if (!ret)
598 ret = sysfs_emit(buf, "%*phN\n", ppid.id_len, ppid.id);
599 }
600 rtnl_unlock();
601
602 return ret;
603}
604static DEVICE_ATTR_RO(phys_switch_id);
605
606static ssize_t threaded_show(struct device *dev,
607 struct device_attribute *attr, char *buf)
608{
609 struct net_device *netdev = to_net_dev(dev);
610 ssize_t ret = -EINVAL;
611
612 rcu_read_lock();
613
614 if (dev_isalive(netdev))
615 ret = sysfs_emit(buf, fmt_dec, READ_ONCE(netdev->threaded));
616
617 rcu_read_unlock();
618
619 return ret;
620}
621
622static int modify_napi_threaded(struct net_device *dev, unsigned long val)
623{
624 int ret;
625
626 if (list_empty(&dev->napi_list))
627 return -EOPNOTSUPP;
628
629 if (val != 0 && val != 1)
630 return -EOPNOTSUPP;
631
632 ret = dev_set_threaded(dev, val);
633
634 return ret;
635}
636
637static ssize_t threaded_store(struct device *dev,
638 struct device_attribute *attr,
639 const char *buf, size_t len)
640{
641 return netdev_store(dev, attr, buf, len, modify_napi_threaded);
642}
643static DEVICE_ATTR_RW(threaded);
644
645static struct attribute *net_class_attrs[] __ro_after_init = {
646 &dev_attr_netdev_group.attr,
647 &dev_attr_type.attr,
648 &dev_attr_dev_id.attr,
649 &dev_attr_dev_port.attr,
650 &dev_attr_iflink.attr,
651 &dev_attr_ifindex.attr,
652 &dev_attr_name_assign_type.attr,
653 &dev_attr_addr_assign_type.attr,
654 &dev_attr_addr_len.attr,
655 &dev_attr_link_mode.attr,
656 &dev_attr_address.attr,
657 &dev_attr_broadcast.attr,
658 &dev_attr_speed.attr,
659 &dev_attr_duplex.attr,
660 &dev_attr_dormant.attr,
661 &dev_attr_testing.attr,
662 &dev_attr_operstate.attr,
663 &dev_attr_carrier_changes.attr,
664 &dev_attr_ifalias.attr,
665 &dev_attr_carrier.attr,
666 &dev_attr_mtu.attr,
667 &dev_attr_flags.attr,
668 &dev_attr_tx_queue_len.attr,
669 &dev_attr_gro_flush_timeout.attr,
670 &dev_attr_napi_defer_hard_irqs.attr,
671 &dev_attr_phys_port_id.attr,
672 &dev_attr_phys_port_name.attr,
673 &dev_attr_phys_switch_id.attr,
674 &dev_attr_proto_down.attr,
675 &dev_attr_carrier_up_count.attr,
676 &dev_attr_carrier_down_count.attr,
677 &dev_attr_threaded.attr,
678 NULL,
679};
680ATTRIBUTE_GROUPS(net_class);
681
682/* Show a given an attribute in the statistics group */
683static ssize_t netstat_show(const struct device *d,
684 struct device_attribute *attr, char *buf,
685 unsigned long offset)
686{
687 struct net_device *dev = to_net_dev(d);
688 ssize_t ret = -EINVAL;
689
690 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
691 offset % sizeof(u64) != 0);
692
693 rcu_read_lock();
694 if (dev_isalive(dev)) {
695 struct rtnl_link_stats64 temp;
696 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
697
698 ret = sysfs_emit(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
699 }
700 rcu_read_unlock();
701 return ret;
702}
703
704/* generate a read-only statistics attribute */
705#define NETSTAT_ENTRY(name) \
706static ssize_t name##_show(struct device *d, \
707 struct device_attribute *attr, char *buf) \
708{ \
709 return netstat_show(d, attr, buf, \
710 offsetof(struct rtnl_link_stats64, name)); \
711} \
712static DEVICE_ATTR_RO(name)
713
714NETSTAT_ENTRY(rx_packets);
715NETSTAT_ENTRY(tx_packets);
716NETSTAT_ENTRY(rx_bytes);
717NETSTAT_ENTRY(tx_bytes);
718NETSTAT_ENTRY(rx_errors);
719NETSTAT_ENTRY(tx_errors);
720NETSTAT_ENTRY(rx_dropped);
721NETSTAT_ENTRY(tx_dropped);
722NETSTAT_ENTRY(multicast);
723NETSTAT_ENTRY(collisions);
724NETSTAT_ENTRY(rx_length_errors);
725NETSTAT_ENTRY(rx_over_errors);
726NETSTAT_ENTRY(rx_crc_errors);
727NETSTAT_ENTRY(rx_frame_errors);
728NETSTAT_ENTRY(rx_fifo_errors);
729NETSTAT_ENTRY(rx_missed_errors);
730NETSTAT_ENTRY(tx_aborted_errors);
731NETSTAT_ENTRY(tx_carrier_errors);
732NETSTAT_ENTRY(tx_fifo_errors);
733NETSTAT_ENTRY(tx_heartbeat_errors);
734NETSTAT_ENTRY(tx_window_errors);
735NETSTAT_ENTRY(rx_compressed);
736NETSTAT_ENTRY(tx_compressed);
737NETSTAT_ENTRY(rx_nohandler);
738
739static struct attribute *netstat_attrs[] __ro_after_init = {
740 &dev_attr_rx_packets.attr,
741 &dev_attr_tx_packets.attr,
742 &dev_attr_rx_bytes.attr,
743 &dev_attr_tx_bytes.attr,
744 &dev_attr_rx_errors.attr,
745 &dev_attr_tx_errors.attr,
746 &dev_attr_rx_dropped.attr,
747 &dev_attr_tx_dropped.attr,
748 &dev_attr_multicast.attr,
749 &dev_attr_collisions.attr,
750 &dev_attr_rx_length_errors.attr,
751 &dev_attr_rx_over_errors.attr,
752 &dev_attr_rx_crc_errors.attr,
753 &dev_attr_rx_frame_errors.attr,
754 &dev_attr_rx_fifo_errors.attr,
755 &dev_attr_rx_missed_errors.attr,
756 &dev_attr_tx_aborted_errors.attr,
757 &dev_attr_tx_carrier_errors.attr,
758 &dev_attr_tx_fifo_errors.attr,
759 &dev_attr_tx_heartbeat_errors.attr,
760 &dev_attr_tx_window_errors.attr,
761 &dev_attr_rx_compressed.attr,
762 &dev_attr_tx_compressed.attr,
763 &dev_attr_rx_nohandler.attr,
764 NULL
765};
766
767static const struct attribute_group netstat_group = {
768 .name = "statistics",
769 .attrs = netstat_attrs,
770};
771
772static struct attribute *wireless_attrs[] = {
773 NULL
774};
775
776static const struct attribute_group wireless_group = {
777 .name = "wireless",
778 .attrs = wireless_attrs,
779};
780
781static bool wireless_group_needed(struct net_device *ndev)
782{
783#if IS_ENABLED(CONFIG_CFG80211)
784 if (ndev->ieee80211_ptr)
785 return true;
786#endif
787#if IS_ENABLED(CONFIG_WIRELESS_EXT)
788 if (ndev->wireless_handlers)
789 return true;
790#endif
791 return false;
792}
793
794#else /* CONFIG_SYSFS */
795#define net_class_groups NULL
796#endif /* CONFIG_SYSFS */
797
798#ifdef CONFIG_SYSFS
799#define to_rx_queue_attr(_attr) \
800 container_of(_attr, struct rx_queue_attribute, attr)
801
802#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
803
804static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
805 char *buf)
806{
807 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
808 struct netdev_rx_queue *queue = to_rx_queue(kobj);
809
810 if (!attribute->show)
811 return -EIO;
812
813 return attribute->show(queue, buf);
814}
815
816static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
817 const char *buf, size_t count)
818{
819 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
820 struct netdev_rx_queue *queue = to_rx_queue(kobj);
821
822 if (!attribute->store)
823 return -EIO;
824
825 return attribute->store(queue, buf, count);
826}
827
828static const struct sysfs_ops rx_queue_sysfs_ops = {
829 .show = rx_queue_attr_show,
830 .store = rx_queue_attr_store,
831};
832
833#ifdef CONFIG_RPS
834static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
835{
836 struct rps_map *map;
837 cpumask_var_t mask;
838 int i, len;
839
840 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
841 return -ENOMEM;
842
843 rcu_read_lock();
844 map = rcu_dereference(queue->rps_map);
845 if (map)
846 for (i = 0; i < map->len; i++)
847 cpumask_set_cpu(map->cpus[i], mask);
848
849 len = sysfs_emit(buf, "%*pb\n", cpumask_pr_args(mask));
850 rcu_read_unlock();
851 free_cpumask_var(mask);
852
853 return len < PAGE_SIZE ? len : -EINVAL;
854}
855
856static int netdev_rx_queue_set_rps_mask(struct netdev_rx_queue *queue,
857 cpumask_var_t mask)
858{
859 static DEFINE_MUTEX(rps_map_mutex);
860 struct rps_map *old_map, *map;
861 int cpu, i;
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 return -ENOMEM;
868
869 i = 0;
870 for_each_cpu_and(cpu, mask, cpu_online_mask)
871 map->cpus[i++] = cpu;
872
873 if (i) {
874 map->len = i;
875 } else {
876 kfree(map);
877 map = NULL;
878 }
879
880 mutex_lock(&rps_map_mutex);
881 old_map = rcu_dereference_protected(queue->rps_map,
882 mutex_is_locked(&rps_map_mutex));
883 rcu_assign_pointer(queue->rps_map, map);
884
885 if (map)
886 static_branch_inc(&rps_needed);
887 if (old_map)
888 static_branch_dec(&rps_needed);
889
890 mutex_unlock(&rps_map_mutex);
891
892 if (old_map)
893 kfree_rcu(old_map, rcu);
894 return 0;
895}
896
897int rps_cpumask_housekeeping(struct cpumask *mask)
898{
899 if (!cpumask_empty(mask)) {
900 cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_DOMAIN));
901 cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_WQ));
902 if (cpumask_empty(mask))
903 return -EINVAL;
904 }
905 return 0;
906}
907
908static ssize_t store_rps_map(struct netdev_rx_queue *queue,
909 const char *buf, size_t len)
910{
911 cpumask_var_t mask;
912 int err;
913
914 if (!capable(CAP_NET_ADMIN))
915 return -EPERM;
916
917 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
918 return -ENOMEM;
919
920 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
921 if (err)
922 goto out;
923
924 err = rps_cpumask_housekeeping(mask);
925 if (err)
926 goto out;
927
928 err = netdev_rx_queue_set_rps_mask(queue, mask);
929
930out:
931 free_cpumask_var(mask);
932 return err ? : len;
933}
934
935static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
936 char *buf)
937{
938 struct rps_dev_flow_table *flow_table;
939 unsigned long val = 0;
940
941 rcu_read_lock();
942 flow_table = rcu_dereference(queue->rps_flow_table);
943 if (flow_table)
944 val = (unsigned long)flow_table->mask + 1;
945 rcu_read_unlock();
946
947 return sysfs_emit(buf, "%lu\n", val);
948}
949
950static void rps_dev_flow_table_release(struct rcu_head *rcu)
951{
952 struct rps_dev_flow_table *table = container_of(rcu,
953 struct rps_dev_flow_table, rcu);
954 vfree(table);
955}
956
957static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
958 const char *buf, size_t len)
959{
960 unsigned long mask, count;
961 struct rps_dev_flow_table *table, *old_table;
962 static DEFINE_SPINLOCK(rps_dev_flow_lock);
963 int rc;
964
965 if (!capable(CAP_NET_ADMIN))
966 return -EPERM;
967
968 rc = kstrtoul(buf, 0, &count);
969 if (rc < 0)
970 return rc;
971
972 if (count) {
973 mask = count - 1;
974 /* mask = roundup_pow_of_two(count) - 1;
975 * without overflows...
976 */
977 while ((mask | (mask >> 1)) != mask)
978 mask |= (mask >> 1);
979 /* On 64 bit arches, must check mask fits in table->mask (u32),
980 * and on 32bit arches, must check
981 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
982 */
983#if BITS_PER_LONG > 32
984 if (mask > (unsigned long)(u32)mask)
985 return -EINVAL;
986#else
987 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
988 / sizeof(struct rps_dev_flow)) {
989 /* Enforce a limit to prevent overflow */
990 return -EINVAL;
991 }
992#endif
993 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
994 if (!table)
995 return -ENOMEM;
996
997 table->mask = mask;
998 for (count = 0; count <= mask; count++)
999 table->flows[count].cpu = RPS_NO_CPU;
1000 } else {
1001 table = NULL;
1002 }
1003
1004 spin_lock(&rps_dev_flow_lock);
1005 old_table = rcu_dereference_protected(queue->rps_flow_table,
1006 lockdep_is_held(&rps_dev_flow_lock));
1007 rcu_assign_pointer(queue->rps_flow_table, table);
1008 spin_unlock(&rps_dev_flow_lock);
1009
1010 if (old_table)
1011 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
1012
1013 return len;
1014}
1015
1016static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
1017 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
1018
1019static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
1020 = __ATTR(rps_flow_cnt, 0644,
1021 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
1022#endif /* CONFIG_RPS */
1023
1024static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
1025#ifdef CONFIG_RPS
1026 &rps_cpus_attribute.attr,
1027 &rps_dev_flow_table_cnt_attribute.attr,
1028#endif
1029 NULL
1030};
1031ATTRIBUTE_GROUPS(rx_queue_default);
1032
1033static void rx_queue_release(struct kobject *kobj)
1034{
1035 struct netdev_rx_queue *queue = to_rx_queue(kobj);
1036#ifdef CONFIG_RPS
1037 struct rps_map *map;
1038 struct rps_dev_flow_table *flow_table;
1039
1040 map = rcu_dereference_protected(queue->rps_map, 1);
1041 if (map) {
1042 RCU_INIT_POINTER(queue->rps_map, NULL);
1043 kfree_rcu(map, rcu);
1044 }
1045
1046 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
1047 if (flow_table) {
1048 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
1049 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
1050 }
1051#endif
1052
1053 memset(kobj, 0, sizeof(*kobj));
1054 netdev_put(queue->dev, &queue->dev_tracker);
1055}
1056
1057static const void *rx_queue_namespace(const struct kobject *kobj)
1058{
1059 struct netdev_rx_queue *queue = to_rx_queue(kobj);
1060 struct device *dev = &queue->dev->dev;
1061 const void *ns = NULL;
1062
1063 if (dev->class && dev->class->namespace)
1064 ns = dev->class->namespace(dev);
1065
1066 return ns;
1067}
1068
1069static void rx_queue_get_ownership(const struct kobject *kobj,
1070 kuid_t *uid, kgid_t *gid)
1071{
1072 const struct net *net = rx_queue_namespace(kobj);
1073
1074 net_ns_get_ownership(net, uid, gid);
1075}
1076
1077static const struct kobj_type rx_queue_ktype = {
1078 .sysfs_ops = &rx_queue_sysfs_ops,
1079 .release = rx_queue_release,
1080 .default_groups = rx_queue_default_groups,
1081 .namespace = rx_queue_namespace,
1082 .get_ownership = rx_queue_get_ownership,
1083};
1084
1085static int rx_queue_default_mask(struct net_device *dev,
1086 struct netdev_rx_queue *queue)
1087{
1088#if IS_ENABLED(CONFIG_RPS) && IS_ENABLED(CONFIG_SYSCTL)
1089 struct cpumask *rps_default_mask = READ_ONCE(dev_net(dev)->core.rps_default_mask);
1090
1091 if (rps_default_mask && !cpumask_empty(rps_default_mask))
1092 return netdev_rx_queue_set_rps_mask(queue, rps_default_mask);
1093#endif
1094 return 0;
1095}
1096
1097static int rx_queue_add_kobject(struct net_device *dev, int index)
1098{
1099 struct netdev_rx_queue *queue = dev->_rx + index;
1100 struct kobject *kobj = &queue->kobj;
1101 int error = 0;
1102
1103 /* Kobject_put later will trigger rx_queue_release call which
1104 * decreases dev refcount: Take that reference here
1105 */
1106 netdev_hold(queue->dev, &queue->dev_tracker, GFP_KERNEL);
1107
1108 kobj->kset = dev->queues_kset;
1109 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
1110 "rx-%u", index);
1111 if (error)
1112 goto err;
1113
1114 if (dev->sysfs_rx_queue_group) {
1115 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
1116 if (error)
1117 goto err;
1118 }
1119
1120 error = rx_queue_default_mask(dev, queue);
1121 if (error)
1122 goto err;
1123
1124 kobject_uevent(kobj, KOBJ_ADD);
1125
1126 return error;
1127
1128err:
1129 kobject_put(kobj);
1130 return error;
1131}
1132
1133static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
1134 kgid_t kgid)
1135{
1136 struct netdev_rx_queue *queue = dev->_rx + index;
1137 struct kobject *kobj = &queue->kobj;
1138 int error;
1139
1140 error = sysfs_change_owner(kobj, kuid, kgid);
1141 if (error)
1142 return error;
1143
1144 if (dev->sysfs_rx_queue_group)
1145 error = sysfs_group_change_owner(
1146 kobj, dev->sysfs_rx_queue_group, kuid, kgid);
1147
1148 return error;
1149}
1150#endif /* CONFIG_SYSFS */
1151
1152int
1153net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1154{
1155#ifdef CONFIG_SYSFS
1156 int i;
1157 int error = 0;
1158
1159#ifndef CONFIG_RPS
1160 if (!dev->sysfs_rx_queue_group)
1161 return 0;
1162#endif
1163 for (i = old_num; i < new_num; i++) {
1164 error = rx_queue_add_kobject(dev, i);
1165 if (error) {
1166 new_num = old_num;
1167 break;
1168 }
1169 }
1170
1171 while (--i >= new_num) {
1172 struct kobject *kobj = &dev->_rx[i].kobj;
1173
1174 if (!refcount_read(&dev_net(dev)->ns.count))
1175 kobj->uevent_suppress = 1;
1176 if (dev->sysfs_rx_queue_group)
1177 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
1178 kobject_put(kobj);
1179 }
1180
1181 return error;
1182#else
1183 return 0;
1184#endif
1185}
1186
1187static int net_rx_queue_change_owner(struct net_device *dev, int num,
1188 kuid_t kuid, kgid_t kgid)
1189{
1190#ifdef CONFIG_SYSFS
1191 int error = 0;
1192 int i;
1193
1194#ifndef CONFIG_RPS
1195 if (!dev->sysfs_rx_queue_group)
1196 return 0;
1197#endif
1198 for (i = 0; i < num; i++) {
1199 error = rx_queue_change_owner(dev, i, kuid, kgid);
1200 if (error)
1201 break;
1202 }
1203
1204 return error;
1205#else
1206 return 0;
1207#endif
1208}
1209
1210#ifdef CONFIG_SYSFS
1211/*
1212 * netdev_queue sysfs structures and functions.
1213 */
1214struct netdev_queue_attribute {
1215 struct attribute attr;
1216 ssize_t (*show)(struct netdev_queue *queue, char *buf);
1217 ssize_t (*store)(struct netdev_queue *queue,
1218 const char *buf, size_t len);
1219};
1220#define to_netdev_queue_attr(_attr) \
1221 container_of(_attr, struct netdev_queue_attribute, attr)
1222
1223#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1224
1225static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1226 struct attribute *attr, char *buf)
1227{
1228 const struct netdev_queue_attribute *attribute
1229 = to_netdev_queue_attr(attr);
1230 struct netdev_queue *queue = to_netdev_queue(kobj);
1231
1232 if (!attribute->show)
1233 return -EIO;
1234
1235 return attribute->show(queue, buf);
1236}
1237
1238static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1239 struct attribute *attr,
1240 const char *buf, size_t count)
1241{
1242 const struct netdev_queue_attribute *attribute
1243 = to_netdev_queue_attr(attr);
1244 struct netdev_queue *queue = to_netdev_queue(kobj);
1245
1246 if (!attribute->store)
1247 return -EIO;
1248
1249 return attribute->store(queue, buf, count);
1250}
1251
1252static const struct sysfs_ops netdev_queue_sysfs_ops = {
1253 .show = netdev_queue_attr_show,
1254 .store = netdev_queue_attr_store,
1255};
1256
1257static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1258{
1259 unsigned long trans_timeout = atomic_long_read(&queue->trans_timeout);
1260
1261 return sysfs_emit(buf, fmt_ulong, trans_timeout);
1262}
1263
1264static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1265{
1266 struct net_device *dev = queue->dev;
1267 unsigned int i;
1268
1269 i = queue - dev->_tx;
1270 BUG_ON(i >= dev->num_tx_queues);
1271
1272 return i;
1273}
1274
1275static ssize_t traffic_class_show(struct netdev_queue *queue,
1276 char *buf)
1277{
1278 struct net_device *dev = queue->dev;
1279 int num_tc, tc;
1280 int index;
1281
1282 if (!netif_is_multiqueue(dev))
1283 return -ENOENT;
1284
1285 if (!rtnl_trylock())
1286 return restart_syscall();
1287
1288 index = get_netdev_queue_index(queue);
1289
1290 /* If queue belongs to subordinate dev use its TC mapping */
1291 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1292
1293 num_tc = dev->num_tc;
1294 tc = netdev_txq_to_tc(dev, index);
1295
1296 rtnl_unlock();
1297
1298 if (tc < 0)
1299 return -EINVAL;
1300
1301 /* We can report the traffic class one of two ways:
1302 * Subordinate device traffic classes are reported with the traffic
1303 * class first, and then the subordinate class so for example TC0 on
1304 * subordinate device 2 will be reported as "0-2". If the queue
1305 * belongs to the root device it will be reported with just the
1306 * traffic class, so just "0" for TC 0 for example.
1307 */
1308 return num_tc < 0 ? sysfs_emit(buf, "%d%d\n", tc, num_tc) :
1309 sysfs_emit(buf, "%d\n", tc);
1310}
1311
1312#ifdef CONFIG_XPS
1313static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1314 char *buf)
1315{
1316 return sysfs_emit(buf, "%lu\n", queue->tx_maxrate);
1317}
1318
1319static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1320 const char *buf, size_t len)
1321{
1322 struct net_device *dev = queue->dev;
1323 int err, index = get_netdev_queue_index(queue);
1324 u32 rate = 0;
1325
1326 if (!capable(CAP_NET_ADMIN))
1327 return -EPERM;
1328
1329 /* The check is also done later; this helps returning early without
1330 * hitting the trylock/restart below.
1331 */
1332 if (!dev->netdev_ops->ndo_set_tx_maxrate)
1333 return -EOPNOTSUPP;
1334
1335 err = kstrtou32(buf, 10, &rate);
1336 if (err < 0)
1337 return err;
1338
1339 if (!rtnl_trylock())
1340 return restart_syscall();
1341
1342 err = -EOPNOTSUPP;
1343 if (dev->netdev_ops->ndo_set_tx_maxrate)
1344 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1345
1346 rtnl_unlock();
1347 if (!err) {
1348 queue->tx_maxrate = rate;
1349 return len;
1350 }
1351 return err;
1352}
1353
1354static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1355 = __ATTR_RW(tx_maxrate);
1356#endif
1357
1358static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1359 = __ATTR_RO(tx_timeout);
1360
1361static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1362 = __ATTR_RO(traffic_class);
1363
1364#ifdef CONFIG_BQL
1365/*
1366 * Byte queue limits sysfs structures and functions.
1367 */
1368static ssize_t bql_show(char *buf, unsigned int value)
1369{
1370 return sysfs_emit(buf, "%u\n", value);
1371}
1372
1373static ssize_t bql_set(const char *buf, const size_t count,
1374 unsigned int *pvalue)
1375{
1376 unsigned int value;
1377 int err;
1378
1379 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1380 value = DQL_MAX_LIMIT;
1381 } else {
1382 err = kstrtouint(buf, 10, &value);
1383 if (err < 0)
1384 return err;
1385 if (value > DQL_MAX_LIMIT)
1386 return -EINVAL;
1387 }
1388
1389 *pvalue = value;
1390
1391 return count;
1392}
1393
1394static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1395 char *buf)
1396{
1397 struct dql *dql = &queue->dql;
1398
1399 return sysfs_emit(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1400}
1401
1402static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1403 const char *buf, size_t len)
1404{
1405 struct dql *dql = &queue->dql;
1406 unsigned int value;
1407 int err;
1408
1409 err = kstrtouint(buf, 10, &value);
1410 if (err < 0)
1411 return err;
1412
1413 dql->slack_hold_time = msecs_to_jiffies(value);
1414
1415 return len;
1416}
1417
1418static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1419 = __ATTR(hold_time, 0644,
1420 bql_show_hold_time, bql_set_hold_time);
1421
1422static ssize_t bql_show_stall_thrs(struct netdev_queue *queue, char *buf)
1423{
1424 struct dql *dql = &queue->dql;
1425
1426 return sysfs_emit(buf, "%u\n", jiffies_to_msecs(dql->stall_thrs));
1427}
1428
1429static ssize_t bql_set_stall_thrs(struct netdev_queue *queue,
1430 const char *buf, size_t len)
1431{
1432 struct dql *dql = &queue->dql;
1433 unsigned int value;
1434 int err;
1435
1436 err = kstrtouint(buf, 10, &value);
1437 if (err < 0)
1438 return err;
1439
1440 value = msecs_to_jiffies(value);
1441 if (value && (value < 4 || value > 4 / 2 * BITS_PER_LONG))
1442 return -ERANGE;
1443
1444 if (!dql->stall_thrs && value)
1445 dql->last_reap = jiffies;
1446 /* Force last_reap to be live */
1447 smp_wmb();
1448 dql->stall_thrs = value;
1449
1450 return len;
1451}
1452
1453static struct netdev_queue_attribute bql_stall_thrs_attribute __ro_after_init =
1454 __ATTR(stall_thrs, 0644, bql_show_stall_thrs, bql_set_stall_thrs);
1455
1456static ssize_t bql_show_stall_max(struct netdev_queue *queue, char *buf)
1457{
1458 return sysfs_emit(buf, "%u\n", READ_ONCE(queue->dql.stall_max));
1459}
1460
1461static ssize_t bql_set_stall_max(struct netdev_queue *queue,
1462 const char *buf, size_t len)
1463{
1464 WRITE_ONCE(queue->dql.stall_max, 0);
1465 return len;
1466}
1467
1468static struct netdev_queue_attribute bql_stall_max_attribute __ro_after_init =
1469 __ATTR(stall_max, 0644, bql_show_stall_max, bql_set_stall_max);
1470
1471static ssize_t bql_show_stall_cnt(struct netdev_queue *queue, char *buf)
1472{
1473 struct dql *dql = &queue->dql;
1474
1475 return sysfs_emit(buf, "%lu\n", dql->stall_cnt);
1476}
1477
1478static struct netdev_queue_attribute bql_stall_cnt_attribute __ro_after_init =
1479 __ATTR(stall_cnt, 0444, bql_show_stall_cnt, NULL);
1480
1481static ssize_t bql_show_inflight(struct netdev_queue *queue,
1482 char *buf)
1483{
1484 struct dql *dql = &queue->dql;
1485
1486 return sysfs_emit(buf, "%u\n", dql->num_queued - dql->num_completed);
1487}
1488
1489static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1490 __ATTR(inflight, 0444, bql_show_inflight, NULL);
1491
1492#define BQL_ATTR(NAME, FIELD) \
1493static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1494 char *buf) \
1495{ \
1496 return bql_show(buf, queue->dql.FIELD); \
1497} \
1498 \
1499static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1500 const char *buf, size_t len) \
1501{ \
1502 return bql_set(buf, len, &queue->dql.FIELD); \
1503} \
1504 \
1505static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1506 = __ATTR(NAME, 0644, \
1507 bql_show_ ## NAME, bql_set_ ## NAME)
1508
1509BQL_ATTR(limit, limit);
1510BQL_ATTR(limit_max, max_limit);
1511BQL_ATTR(limit_min, min_limit);
1512
1513static struct attribute *dql_attrs[] __ro_after_init = {
1514 &bql_limit_attribute.attr,
1515 &bql_limit_max_attribute.attr,
1516 &bql_limit_min_attribute.attr,
1517 &bql_hold_time_attribute.attr,
1518 &bql_inflight_attribute.attr,
1519 &bql_stall_thrs_attribute.attr,
1520 &bql_stall_cnt_attribute.attr,
1521 &bql_stall_max_attribute.attr,
1522 NULL
1523};
1524
1525static const struct attribute_group dql_group = {
1526 .name = "byte_queue_limits",
1527 .attrs = dql_attrs,
1528};
1529#else
1530/* Fake declaration, all the code using it should be dead */
1531static const struct attribute_group dql_group = {};
1532#endif /* CONFIG_BQL */
1533
1534#ifdef CONFIG_XPS
1535static ssize_t xps_queue_show(struct net_device *dev, unsigned int index,
1536 int tc, char *buf, enum xps_map_type type)
1537{
1538 struct xps_dev_maps *dev_maps;
1539 unsigned long *mask;
1540 unsigned int nr_ids;
1541 int j, len;
1542
1543 rcu_read_lock();
1544 dev_maps = rcu_dereference(dev->xps_maps[type]);
1545
1546 /* Default to nr_cpu_ids/dev->num_rx_queues and do not just return 0
1547 * when dev_maps hasn't been allocated yet, to be backward compatible.
1548 */
1549 nr_ids = dev_maps ? dev_maps->nr_ids :
1550 (type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues);
1551
1552 mask = bitmap_zalloc(nr_ids, GFP_NOWAIT);
1553 if (!mask) {
1554 rcu_read_unlock();
1555 return -ENOMEM;
1556 }
1557
1558 if (!dev_maps || tc >= dev_maps->num_tc)
1559 goto out_no_maps;
1560
1561 for (j = 0; j < nr_ids; j++) {
1562 int i, tci = j * dev_maps->num_tc + tc;
1563 struct xps_map *map;
1564
1565 map = rcu_dereference(dev_maps->attr_map[tci]);
1566 if (!map)
1567 continue;
1568
1569 for (i = map->len; i--;) {
1570 if (map->queues[i] == index) {
1571 __set_bit(j, mask);
1572 break;
1573 }
1574 }
1575 }
1576out_no_maps:
1577 rcu_read_unlock();
1578
1579 len = bitmap_print_to_pagebuf(false, buf, mask, nr_ids);
1580 bitmap_free(mask);
1581
1582 return len < PAGE_SIZE ? len : -EINVAL;
1583}
1584
1585static ssize_t xps_cpus_show(struct netdev_queue *queue, char *buf)
1586{
1587 struct net_device *dev = queue->dev;
1588 unsigned int index;
1589 int len, tc;
1590
1591 if (!netif_is_multiqueue(dev))
1592 return -ENOENT;
1593
1594 index = get_netdev_queue_index(queue);
1595
1596 if (!rtnl_trylock())
1597 return restart_syscall();
1598
1599 /* If queue belongs to subordinate dev use its map */
1600 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1601
1602 tc = netdev_txq_to_tc(dev, index);
1603 if (tc < 0) {
1604 rtnl_unlock();
1605 return -EINVAL;
1606 }
1607
1608 /* Make sure the subordinate device can't be freed */
1609 get_device(&dev->dev);
1610 rtnl_unlock();
1611
1612 len = xps_queue_show(dev, index, tc, buf, XPS_CPUS);
1613
1614 put_device(&dev->dev);
1615 return len;
1616}
1617
1618static ssize_t xps_cpus_store(struct netdev_queue *queue,
1619 const char *buf, size_t len)
1620{
1621 struct net_device *dev = queue->dev;
1622 unsigned int index;
1623 cpumask_var_t mask;
1624 int err;
1625
1626 if (!netif_is_multiqueue(dev))
1627 return -ENOENT;
1628
1629 if (!capable(CAP_NET_ADMIN))
1630 return -EPERM;
1631
1632 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1633 return -ENOMEM;
1634
1635 index = get_netdev_queue_index(queue);
1636
1637 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1638 if (err) {
1639 free_cpumask_var(mask);
1640 return err;
1641 }
1642
1643 if (!rtnl_trylock()) {
1644 free_cpumask_var(mask);
1645 return restart_syscall();
1646 }
1647
1648 err = netif_set_xps_queue(dev, mask, index);
1649 rtnl_unlock();
1650
1651 free_cpumask_var(mask);
1652
1653 return err ? : len;
1654}
1655
1656static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1657 = __ATTR_RW(xps_cpus);
1658
1659static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1660{
1661 struct net_device *dev = queue->dev;
1662 unsigned int index;
1663 int tc;
1664
1665 index = get_netdev_queue_index(queue);
1666
1667 if (!rtnl_trylock())
1668 return restart_syscall();
1669
1670 tc = netdev_txq_to_tc(dev, index);
1671 rtnl_unlock();
1672 if (tc < 0)
1673 return -EINVAL;
1674
1675 return xps_queue_show(dev, index, tc, buf, XPS_RXQS);
1676}
1677
1678static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1679 size_t len)
1680{
1681 struct net_device *dev = queue->dev;
1682 struct net *net = dev_net(dev);
1683 unsigned long *mask;
1684 unsigned int index;
1685 int err;
1686
1687 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1688 return -EPERM;
1689
1690 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1691 if (!mask)
1692 return -ENOMEM;
1693
1694 index = get_netdev_queue_index(queue);
1695
1696 err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1697 if (err) {
1698 bitmap_free(mask);
1699 return err;
1700 }
1701
1702 if (!rtnl_trylock()) {
1703 bitmap_free(mask);
1704 return restart_syscall();
1705 }
1706
1707 cpus_read_lock();
1708 err = __netif_set_xps_queue(dev, mask, index, XPS_RXQS);
1709 cpus_read_unlock();
1710
1711 rtnl_unlock();
1712
1713 bitmap_free(mask);
1714 return err ? : len;
1715}
1716
1717static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1718 = __ATTR_RW(xps_rxqs);
1719#endif /* CONFIG_XPS */
1720
1721static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1722 &queue_trans_timeout.attr,
1723 &queue_traffic_class.attr,
1724#ifdef CONFIG_XPS
1725 &xps_cpus_attribute.attr,
1726 &xps_rxqs_attribute.attr,
1727 &queue_tx_maxrate.attr,
1728#endif
1729 NULL
1730};
1731ATTRIBUTE_GROUPS(netdev_queue_default);
1732
1733static void netdev_queue_release(struct kobject *kobj)
1734{
1735 struct netdev_queue *queue = to_netdev_queue(kobj);
1736
1737 memset(kobj, 0, sizeof(*kobj));
1738 netdev_put(queue->dev, &queue->dev_tracker);
1739}
1740
1741static const void *netdev_queue_namespace(const struct kobject *kobj)
1742{
1743 struct netdev_queue *queue = to_netdev_queue(kobj);
1744 struct device *dev = &queue->dev->dev;
1745 const void *ns = NULL;
1746
1747 if (dev->class && dev->class->namespace)
1748 ns = dev->class->namespace(dev);
1749
1750 return ns;
1751}
1752
1753static void netdev_queue_get_ownership(const struct kobject *kobj,
1754 kuid_t *uid, kgid_t *gid)
1755{
1756 const struct net *net = netdev_queue_namespace(kobj);
1757
1758 net_ns_get_ownership(net, uid, gid);
1759}
1760
1761static const struct kobj_type netdev_queue_ktype = {
1762 .sysfs_ops = &netdev_queue_sysfs_ops,
1763 .release = netdev_queue_release,
1764 .default_groups = netdev_queue_default_groups,
1765 .namespace = netdev_queue_namespace,
1766 .get_ownership = netdev_queue_get_ownership,
1767};
1768
1769static bool netdev_uses_bql(const struct net_device *dev)
1770{
1771 if (dev->lltx || (dev->priv_flags & IFF_NO_QUEUE))
1772 return false;
1773
1774 return IS_ENABLED(CONFIG_BQL);
1775}
1776
1777static int netdev_queue_add_kobject(struct net_device *dev, int index)
1778{
1779 struct netdev_queue *queue = dev->_tx + index;
1780 struct kobject *kobj = &queue->kobj;
1781 int error = 0;
1782
1783 /* Kobject_put later will trigger netdev_queue_release call
1784 * which decreases dev refcount: Take that reference here
1785 */
1786 netdev_hold(queue->dev, &queue->dev_tracker, GFP_KERNEL);
1787
1788 kobj->kset = dev->queues_kset;
1789 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1790 "tx-%u", index);
1791 if (error)
1792 goto err;
1793
1794 if (netdev_uses_bql(dev)) {
1795 error = sysfs_create_group(kobj, &dql_group);
1796 if (error)
1797 goto err;
1798 }
1799
1800 kobject_uevent(kobj, KOBJ_ADD);
1801 return 0;
1802
1803err:
1804 kobject_put(kobj);
1805 return error;
1806}
1807
1808static int tx_queue_change_owner(struct net_device *ndev, int index,
1809 kuid_t kuid, kgid_t kgid)
1810{
1811 struct netdev_queue *queue = ndev->_tx + index;
1812 struct kobject *kobj = &queue->kobj;
1813 int error;
1814
1815 error = sysfs_change_owner(kobj, kuid, kgid);
1816 if (error)
1817 return error;
1818
1819 if (netdev_uses_bql(ndev))
1820 error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
1821
1822 return error;
1823}
1824#endif /* CONFIG_SYSFS */
1825
1826int
1827netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1828{
1829#ifdef CONFIG_SYSFS
1830 int i;
1831 int error = 0;
1832
1833 /* Tx queue kobjects are allowed to be updated when a device is being
1834 * unregistered, but solely to remove queues from qdiscs. Any path
1835 * adding queues should be fixed.
1836 */
1837 WARN(dev->reg_state == NETREG_UNREGISTERING && new_num > old_num,
1838 "New queues can't be registered after device unregistration.");
1839
1840 for (i = old_num; i < new_num; i++) {
1841 error = netdev_queue_add_kobject(dev, i);
1842 if (error) {
1843 new_num = old_num;
1844 break;
1845 }
1846 }
1847
1848 while (--i >= new_num) {
1849 struct netdev_queue *queue = dev->_tx + i;
1850
1851 if (!refcount_read(&dev_net(dev)->ns.count))
1852 queue->kobj.uevent_suppress = 1;
1853
1854 if (netdev_uses_bql(dev))
1855 sysfs_remove_group(&queue->kobj, &dql_group);
1856
1857 kobject_put(&queue->kobj);
1858 }
1859
1860 return error;
1861#else
1862 return 0;
1863#endif /* CONFIG_SYSFS */
1864}
1865
1866static int net_tx_queue_change_owner(struct net_device *dev, int num,
1867 kuid_t kuid, kgid_t kgid)
1868{
1869#ifdef CONFIG_SYSFS
1870 int error = 0;
1871 int i;
1872
1873 for (i = 0; i < num; i++) {
1874 error = tx_queue_change_owner(dev, i, kuid, kgid);
1875 if (error)
1876 break;
1877 }
1878
1879 return error;
1880#else
1881 return 0;
1882#endif /* CONFIG_SYSFS */
1883}
1884
1885static int register_queue_kobjects(struct net_device *dev)
1886{
1887 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1888
1889#ifdef CONFIG_SYSFS
1890 dev->queues_kset = kset_create_and_add("queues",
1891 NULL, &dev->dev.kobj);
1892 if (!dev->queues_kset)
1893 return -ENOMEM;
1894 real_rx = dev->real_num_rx_queues;
1895#endif
1896 real_tx = dev->real_num_tx_queues;
1897
1898 error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1899 if (error)
1900 goto error;
1901 rxq = real_rx;
1902
1903 error = netdev_queue_update_kobjects(dev, 0, real_tx);
1904 if (error)
1905 goto error;
1906 txq = real_tx;
1907
1908 return 0;
1909
1910error:
1911 netdev_queue_update_kobjects(dev, txq, 0);
1912 net_rx_queue_update_kobjects(dev, rxq, 0);
1913#ifdef CONFIG_SYSFS
1914 kset_unregister(dev->queues_kset);
1915#endif
1916 return error;
1917}
1918
1919static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
1920{
1921 int error = 0, real_rx = 0, real_tx = 0;
1922
1923#ifdef CONFIG_SYSFS
1924 if (ndev->queues_kset) {
1925 error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
1926 if (error)
1927 return error;
1928 }
1929 real_rx = ndev->real_num_rx_queues;
1930#endif
1931 real_tx = ndev->real_num_tx_queues;
1932
1933 error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
1934 if (error)
1935 return error;
1936
1937 error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
1938 if (error)
1939 return error;
1940
1941 return 0;
1942}
1943
1944static void remove_queue_kobjects(struct net_device *dev)
1945{
1946 int real_rx = 0, real_tx = 0;
1947
1948#ifdef CONFIG_SYSFS
1949 real_rx = dev->real_num_rx_queues;
1950#endif
1951 real_tx = dev->real_num_tx_queues;
1952
1953 net_rx_queue_update_kobjects(dev, real_rx, 0);
1954 netdev_queue_update_kobjects(dev, real_tx, 0);
1955
1956 dev->real_num_rx_queues = 0;
1957 dev->real_num_tx_queues = 0;
1958#ifdef CONFIG_SYSFS
1959 kset_unregister(dev->queues_kset);
1960#endif
1961}
1962
1963static bool net_current_may_mount(void)
1964{
1965 struct net *net = current->nsproxy->net_ns;
1966
1967 return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1968}
1969
1970static void *net_grab_current_ns(void)
1971{
1972 struct net *ns = current->nsproxy->net_ns;
1973#ifdef CONFIG_NET_NS
1974 if (ns)
1975 refcount_inc(&ns->passive);
1976#endif
1977 return ns;
1978}
1979
1980static const void *net_initial_ns(void)
1981{
1982 return &init_net;
1983}
1984
1985static const void *net_netlink_ns(struct sock *sk)
1986{
1987 return sock_net(sk);
1988}
1989
1990const struct kobj_ns_type_operations net_ns_type_operations = {
1991 .type = KOBJ_NS_TYPE_NET,
1992 .current_may_mount = net_current_may_mount,
1993 .grab_current_ns = net_grab_current_ns,
1994 .netlink_ns = net_netlink_ns,
1995 .initial_ns = net_initial_ns,
1996 .drop_ns = net_drop_ns,
1997};
1998EXPORT_SYMBOL_GPL(net_ns_type_operations);
1999
2000static int netdev_uevent(const struct device *d, struct kobj_uevent_env *env)
2001{
2002 const struct net_device *dev = to_net_dev(d);
2003 int retval;
2004
2005 /* pass interface to uevent. */
2006 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
2007 if (retval)
2008 goto exit;
2009
2010 /* pass ifindex to uevent.
2011 * ifindex is useful as it won't change (interface name may change)
2012 * and is what RtNetlink uses natively.
2013 */
2014 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
2015
2016exit:
2017 return retval;
2018}
2019
2020/*
2021 * netdev_release -- destroy and free a dead device.
2022 * Called when last reference to device kobject is gone.
2023 */
2024static void netdev_release(struct device *d)
2025{
2026 struct net_device *dev = to_net_dev(d);
2027
2028 BUG_ON(dev->reg_state != NETREG_RELEASED);
2029
2030 /* no need to wait for rcu grace period:
2031 * device is dead and about to be freed.
2032 */
2033 kfree(rcu_access_pointer(dev->ifalias));
2034 kvfree(dev);
2035}
2036
2037static const void *net_namespace(const struct device *d)
2038{
2039 const struct net_device *dev = to_net_dev(d);
2040
2041 return dev_net(dev);
2042}
2043
2044static void net_get_ownership(const struct device *d, kuid_t *uid, kgid_t *gid)
2045{
2046 const struct net_device *dev = to_net_dev(d);
2047 const struct net *net = dev_net(dev);
2048
2049 net_ns_get_ownership(net, uid, gid);
2050}
2051
2052static const struct class net_class = {
2053 .name = "net",
2054 .dev_release = netdev_release,
2055 .dev_groups = net_class_groups,
2056 .dev_uevent = netdev_uevent,
2057 .ns_type = &net_ns_type_operations,
2058 .namespace = net_namespace,
2059 .get_ownership = net_get_ownership,
2060};
2061
2062#ifdef CONFIG_OF
2063static int of_dev_node_match(struct device *dev, const void *data)
2064{
2065 for (; dev; dev = dev->parent) {
2066 if (dev->of_node == data)
2067 return 1;
2068 }
2069
2070 return 0;
2071}
2072
2073/*
2074 * of_find_net_device_by_node - lookup the net device for the device node
2075 * @np: OF device node
2076 *
2077 * Looks up the net_device structure corresponding with the device node.
2078 * If successful, returns a pointer to the net_device with the embedded
2079 * struct device refcount incremented by one, or NULL on failure. The
2080 * refcount must be dropped when done with the net_device.
2081 */
2082struct net_device *of_find_net_device_by_node(struct device_node *np)
2083{
2084 struct device *dev;
2085
2086 dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
2087 if (!dev)
2088 return NULL;
2089
2090 return to_net_dev(dev);
2091}
2092EXPORT_SYMBOL(of_find_net_device_by_node);
2093#endif
2094
2095/* Delete sysfs entries but hold kobject reference until after all
2096 * netdev references are gone.
2097 */
2098void netdev_unregister_kobject(struct net_device *ndev)
2099{
2100 struct device *dev = &ndev->dev;
2101
2102 if (!refcount_read(&dev_net(ndev)->ns.count))
2103 dev_set_uevent_suppress(dev, 1);
2104
2105 kobject_get(&dev->kobj);
2106
2107 remove_queue_kobjects(ndev);
2108
2109 pm_runtime_set_memalloc_noio(dev, false);
2110
2111 device_del(dev);
2112}
2113
2114/* Create sysfs entries for network device. */
2115int netdev_register_kobject(struct net_device *ndev)
2116{
2117 struct device *dev = &ndev->dev;
2118 const struct attribute_group **groups = ndev->sysfs_groups;
2119 int error = 0;
2120
2121 device_initialize(dev);
2122 dev->class = &net_class;
2123 dev->platform_data = ndev;
2124 dev->groups = groups;
2125
2126 dev_set_name(dev, "%s", ndev->name);
2127
2128#ifdef CONFIG_SYSFS
2129 /* Allow for a device specific group */
2130 if (*groups)
2131 groups++;
2132
2133 *groups++ = &netstat_group;
2134
2135 if (wireless_group_needed(ndev))
2136 *groups++ = &wireless_group;
2137#endif /* CONFIG_SYSFS */
2138
2139 error = device_add(dev);
2140 if (error)
2141 return error;
2142
2143 error = register_queue_kobjects(ndev);
2144 if (error) {
2145 device_del(dev);
2146 return error;
2147 }
2148
2149 pm_runtime_set_memalloc_noio(dev, true);
2150
2151 return error;
2152}
2153
2154/* Change owner for sysfs entries when moving network devices across network
2155 * namespaces owned by different user namespaces.
2156 */
2157int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
2158 const struct net *net_new)
2159{
2160 kuid_t old_uid = GLOBAL_ROOT_UID, new_uid = GLOBAL_ROOT_UID;
2161 kgid_t old_gid = GLOBAL_ROOT_GID, new_gid = GLOBAL_ROOT_GID;
2162 struct device *dev = &ndev->dev;
2163 int error;
2164
2165 net_ns_get_ownership(net_old, &old_uid, &old_gid);
2166 net_ns_get_ownership(net_new, &new_uid, &new_gid);
2167
2168 /* The network namespace was changed but the owning user namespace is
2169 * identical so there's no need to change the owner of sysfs entries.
2170 */
2171 if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid))
2172 return 0;
2173
2174 error = device_change_owner(dev, new_uid, new_gid);
2175 if (error)
2176 return error;
2177
2178 error = queue_change_owner(ndev, new_uid, new_gid);
2179 if (error)
2180 return error;
2181
2182 return 0;
2183}
2184
2185int netdev_class_create_file_ns(const struct class_attribute *class_attr,
2186 const void *ns)
2187{
2188 return class_create_file_ns(&net_class, class_attr, ns);
2189}
2190EXPORT_SYMBOL(netdev_class_create_file_ns);
2191
2192void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
2193 const void *ns)
2194{
2195 class_remove_file_ns(&net_class, class_attr, ns);
2196}
2197EXPORT_SYMBOL(netdev_class_remove_file_ns);
2198
2199int __init netdev_kobject_init(void)
2200{
2201 kobj_ns_type_register(&net_ns_type_operations);
2202 return class_register(&net_class);
2203}