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
33	static const char fmt_hex[] = "%#x\n";
34	static const char fmt_dec[] = "%d\n";
35	static const char fmt_ulong[] = "%lu\n";
36	static const char fmt_u64[] = "%llu\n";
37
38	/* Caller holds RTNL or RCU */
39	static inline int dev_isalive(const struct net_device *dev)
40	{
41	return READ_ONCE(dev->reg_state) <= NETREG_REGISTERED;
42	}
43
44	/* use same locking rules as GIF* ioctl's */
45	static ssize_t netdev_show(const struct device *dev,
46	struct device_attribute *attr, char *buf,
47	ssize_t (*format)(const struct net_device *, char *))
48	{
49	struct net_device *ndev = to_net_dev(dev);
50	ssize_t ret = -EINVAL;
51
52	rcu_read_lock();
53	if (dev_isalive(dev: ndev))
54	ret = (*format)(ndev, buf);
55	rcu_read_unlock();
56
57	return ret;
58	}
59
60	/* generate a show function for simple field */
61	#define NETDEVICE_SHOW(field, format_string) \
62	static ssize_t format_##field(const struct net_device *dev, char *buf) \
63	{ \
64	return sysfs_emit(buf, format_string, READ_ONCE(dev->field)); \
65	} \
66	static ssize_t field##_show(struct device *dev, \
67	struct device_attribute *attr, char *buf) \
68	{ \
69	return netdev_show(dev, attr, buf, format_##field); \
70	} \
71
72	#define NETDEVICE_SHOW_RO(field, format_string) \
73	NETDEVICE_SHOW(field, format_string); \
74	static DEVICE_ATTR_RO(field)
75
76	#define NETDEVICE_SHOW_RW(field, format_string) \
77	NETDEVICE_SHOW(field, format_string); \
78	static DEVICE_ATTR_RW(field)
79
80	/* use same locking and permission rules as SIF* ioctl's */
81	static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
82	const char *buf, size_t len,
83	int (*set)(struct net_device *, unsigned long))
84	{
85	struct net_device *netdev = to_net_dev(dev);
86	struct net *net = dev_net(dev: netdev);
87	unsigned long new;
88	int ret;
89
90	if (!ns_capable(ns: net->user_ns, CAP_NET_ADMIN))
91	return -EPERM;
92
93	ret = kstrtoul(s: buf, base: 0, res: &new);
94	if (ret)
95	goto err;
96
97	if (!rtnl_trylock())
98	return restart_syscall();
99
100	if (dev_isalive(dev: netdev)) {
101	ret = (*set)(netdev, new);
102	if (ret == 0)
103	ret = len;
104	}
105	rtnl_unlock();
106	err:
107	return ret;
108	}
109
110	NETDEVICE_SHOW_RO(dev_id, fmt_hex);
111	NETDEVICE_SHOW_RO(dev_port, fmt_dec);
112	NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
113	NETDEVICE_SHOW_RO(addr_len, fmt_dec);
114	NETDEVICE_SHOW_RO(ifindex, fmt_dec);
115	NETDEVICE_SHOW_RO(type, fmt_dec);
116	NETDEVICE_SHOW_RO(link_mode, fmt_dec);
117
118	static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
119	char *buf)
120	{
121	struct net_device *ndev = to_net_dev(dev);
122
123	return sysfs_emit(buf, fmt: fmt_dec, dev_get_iflink(dev: ndev));
124	}
125	static DEVICE_ATTR_RO(iflink);
126
127	static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
128	{
129	return sysfs_emit(buf, fmt: fmt_dec, READ_ONCE(dev->name_assign_type));
130	}
131
132	static ssize_t name_assign_type_show(struct device *dev,
133	struct device_attribute *attr,
134	char *buf)
135	{
136	struct net_device *ndev = to_net_dev(dev);
137	ssize_t ret = -EINVAL;
138
139	if (READ_ONCE(ndev->name_assign_type) != NET_NAME_UNKNOWN)
140	ret = netdev_show(dev, attr, buf, format: format_name_assign_type);
141
142	return ret;
143	}
144	static DEVICE_ATTR_RO(name_assign_type);
145
146	/* use same locking rules as GIFHWADDR ioctl's (dev_get_mac_address()) */
147	static ssize_t address_show(struct device *dev, struct device_attribute *attr,
148	char *buf)
149	{
150	struct net_device *ndev = to_net_dev(dev);
151	ssize_t ret = -EINVAL;
152
153	down_read(sem: &dev_addr_sem);
154
155	rcu_read_lock();
156	if (dev_isalive(dev: ndev))
157	ret = sysfs_format_mac(buf, addr: ndev->dev_addr, len: ndev->addr_len);
158	rcu_read_unlock();
159
160	up_read(sem: &dev_addr_sem);
161	return ret;
162	}
163	static DEVICE_ATTR_RO(address);
164
165	static ssize_t broadcast_show(struct device *dev,
166	struct device_attribute *attr, char *buf)
167	{
168	struct net_device *ndev = to_net_dev(dev);
169	int ret = -EINVAL;
170
171	rcu_read_lock();
172	if (dev_isalive(dev: ndev))
173	ret = sysfs_format_mac(buf, addr: ndev->broadcast, len: ndev->addr_len);
174	rcu_read_unlock();
175	return ret;
176	}
177	static DEVICE_ATTR_RO(broadcast);
178
179	static int change_carrier(struct net_device *dev, unsigned long new_carrier)
180	{
181	if (!netif_running(dev))
182	return -EINVAL;
183	return dev_change_carrier(dev, new_carrier: (bool)new_carrier);
184	}
185
186	static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
187	const char *buf, size_t len)
188	{
189	struct net_device *netdev = to_net_dev(dev);
190
191	/* The check is also done in change_carrier; this helps returning early
192	* without hitting the trylock/restart in netdev_store.
193	*/
194	if (!netdev->netdev_ops->ndo_change_carrier)
195	return -EOPNOTSUPP;
196
197	return netdev_store(dev, attr, buf, len, set: change_carrier);
198	}
199
200	static ssize_t carrier_show(struct device *dev,
201	struct device_attribute *attr, char *buf)
202	{
203	struct net_device *netdev = to_net_dev(dev);
204	int ret = -EINVAL;
205
206	if (!rtnl_trylock())
207	return restart_syscall();
208
209	if (netif_running(dev: netdev)) {
210	/* Synchronize carrier state with link watch,
211	* see also rtnl_getlink().
212	*/
213	linkwatch_sync_dev(dev: netdev);
214
215	ret = sysfs_emit(buf, fmt: fmt_dec, !!netif_carrier_ok(dev: netdev));
216	}
217	rtnl_unlock();
218
219	return ret;
220	}
221	static DEVICE_ATTR_RW(carrier);
222
223	static ssize_t speed_show(struct device *dev,
224	struct device_attribute *attr, char *buf)
225	{
226	struct net_device *netdev = to_net_dev(dev);
227	int ret = -EINVAL;
228
229	/* The check is also done in __ethtool_get_link_ksettings; this helps
230	* returning early without hitting the trylock/restart below.
231	*/
232	if (!netdev->ethtool_ops->get_link_ksettings)
233	return ret;
234
235	if (!rtnl_trylock())
236	return restart_syscall();
237
238	if (netif_running(dev: netdev) && netif_device_present(dev: netdev)) {
239	struct ethtool_link_ksettings cmd;
240
241	if (!__ethtool_get_link_ksettings(dev: netdev, link_ksettings: &cmd))
242	ret = sysfs_emit(buf, fmt: fmt_dec, cmd.base.speed);
243	}
244	rtnl_unlock();
245	return ret;
246	}
247	static DEVICE_ATTR_RO(speed);
248
249	static ssize_t duplex_show(struct device *dev,
250	struct device_attribute *attr, char *buf)
251	{
252	struct net_device *netdev = to_net_dev(dev);
253	int ret = -EINVAL;
254
255	/* The check is also done in __ethtool_get_link_ksettings; this helps
256	* returning early without hitting the trylock/restart below.
257	*/
258	if (!netdev->ethtool_ops->get_link_ksettings)
259	return ret;
260
261	if (!rtnl_trylock())
262	return restart_syscall();
263
264	if (netif_running(dev: netdev)) {
265	struct ethtool_link_ksettings cmd;
266
267	if (!__ethtool_get_link_ksettings(dev: netdev, link_ksettings: &cmd)) {
268	const char *duplex;
269
270	switch (cmd.base.duplex) {
271	case DUPLEX_HALF:
272	duplex = "half";
273	break;
274	case DUPLEX_FULL:
275	duplex = "full";
276	break;
277	default:
278	duplex = "unknown";
279	break;
280	}
281	ret = sysfs_emit(buf, fmt: "%s\n", duplex);
282	}
283	}
284	rtnl_unlock();
285	return ret;
286	}
287	static DEVICE_ATTR_RO(duplex);
288
289	static ssize_t testing_show(struct device *dev,
290	struct device_attribute *attr, char *buf)
291	{
292	struct net_device *netdev = to_net_dev(dev);
293
294	if (netif_running(dev: netdev))
295	return sysfs_emit(buf, fmt: fmt_dec, !!netif_testing(dev: netdev));
296
297	return -EINVAL;
298	}
299	static DEVICE_ATTR_RO(testing);
300
301	static ssize_t dormant_show(struct device *dev,
302	struct device_attribute *attr, char *buf)
303	{
304	struct net_device *netdev = to_net_dev(dev);
305
306	if (netif_running(dev: netdev))
307	return sysfs_emit(buf, fmt: fmt_dec, !!netif_dormant(dev: netdev));
308
309	return -EINVAL;
310	}
311	static DEVICE_ATTR_RO(dormant);
312
313	static const char *const operstates[] = {
314	"unknown",
315	"notpresent", /* currently unused */
316	"down",
317	"lowerlayerdown",
318	"testing",
319	"dormant",
320	"up"
321	};
322
323	static ssize_t operstate_show(struct device *dev,
324	struct device_attribute *attr, char *buf)
325	{
326	const struct net_device *netdev = to_net_dev(dev);
327	unsigned char operstate;
328
329	operstate = READ_ONCE(netdev->operstate);
330	if (!netif_running(dev: netdev))
331	operstate = IF_OPER_DOWN;
332
333	if (operstate >= ARRAY_SIZE(operstates))
334	return -EINVAL; /* should not happen */
335
336	return sysfs_emit(buf, fmt: "%s\n", operstates[operstate]);
337	}
338	static DEVICE_ATTR_RO(operstate);
339
340	static ssize_t carrier_changes_show(struct device *dev,
341	struct device_attribute *attr,
342	char *buf)
343	{
344	struct net_device *netdev = to_net_dev(dev);
345
346	return sysfs_emit(buf, fmt: fmt_dec,
347	atomic_read(v: &netdev->carrier_up_count) +
348	atomic_read(v: &netdev->carrier_down_count));
349	}
350	static DEVICE_ATTR_RO(carrier_changes);
351
352	static ssize_t carrier_up_count_show(struct device *dev,
353	struct device_attribute *attr,
354	char *buf)
355	{
356	struct net_device *netdev = to_net_dev(dev);
357
358	return sysfs_emit(buf, fmt: fmt_dec, atomic_read(v: &netdev->carrier_up_count));
359	}
360	static DEVICE_ATTR_RO(carrier_up_count);
361
362	static ssize_t carrier_down_count_show(struct device *dev,
363	struct device_attribute *attr,
364	char *buf)
365	{
366	struct net_device *netdev = to_net_dev(dev);
367
368	return sysfs_emit(buf, fmt: fmt_dec, atomic_read(v: &netdev->carrier_down_count));
369	}
370	static DEVICE_ATTR_RO(carrier_down_count);
371
372	/* read-write attributes */
373
374	static int change_mtu(struct net_device *dev, unsigned long new_mtu)
375	{
376	return dev_set_mtu(dev, (int)new_mtu);
377	}
378
379	static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
380	const char *buf, size_t len)
381	{
382	return netdev_store(dev, attr, buf, len, set: change_mtu);
383	}
384	NETDEVICE_SHOW_RW(mtu, fmt_dec);
385
386	static int change_flags(struct net_device *dev, unsigned long new_flags)
387	{
388	return dev_change_flags(dev, flags: (unsigned int)new_flags, NULL);
389	}
390
391	static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
392	const char *buf, size_t len)
393	{
394	return netdev_store(dev, attr, buf, len, set: change_flags);
395	}
396	NETDEVICE_SHOW_RW(flags, fmt_hex);
397
398	static ssize_t tx_queue_len_store(struct device *dev,
399	struct device_attribute *attr,
400	const char *buf, size_t len)
401	{
402	if (!capable(CAP_NET_ADMIN))
403	return -EPERM;
404
405	return netdev_store(dev, attr, buf, len, set: dev_change_tx_queue_len);
406	}
407	NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
408
409	static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
410	{
411	WRITE_ONCE(dev->gro_flush_timeout, val);
412	return 0;
413	}
414
415	static ssize_t gro_flush_timeout_store(struct device *dev,
416	struct device_attribute *attr,
417	const char *buf, size_t len)
418	{
419	if (!capable(CAP_NET_ADMIN))
420	return -EPERM;
421
422	return netdev_store(dev, attr, buf, len, set: change_gro_flush_timeout);
423	}
424	NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
425
426	static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val)
427	{
428	WRITE_ONCE(dev->napi_defer_hard_irqs, val);
429	return 0;
430	}
431
432	static ssize_t napi_defer_hard_irqs_store(struct device *dev,
433	struct device_attribute *attr,
434	const char *buf, size_t len)
435	{
436	if (!capable(CAP_NET_ADMIN))
437	return -EPERM;
438
439	return netdev_store(dev, attr, buf, len, set: change_napi_defer_hard_irqs);
440	}
441	NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_dec);
442
443	static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
444	const char *buf, size_t len)
445	{
446	struct net_device *netdev = to_net_dev(dev);
447	struct net *net = dev_net(dev: netdev);
448	size_t count = len;
449	ssize_t ret = 0;
450
451	if (!ns_capable(ns: net->user_ns, CAP_NET_ADMIN))
452	return -EPERM;
453
454	/* ignore trailing newline */
455	if (len > 0 && buf[len - 1] == '\n')
456	--count;
457
458	if (!rtnl_trylock())
459	return restart_syscall();
460
461	if (dev_isalive(dev: netdev)) {
462	ret = dev_set_alias(netdev, buf, count);
463	if (ret < 0)
464	goto err;
465	ret = len;
466	netdev_state_change(dev: netdev);
467	}
468	err:
469	rtnl_unlock();
470
471	return ret;
472	}
473
474	static ssize_t ifalias_show(struct device *dev,
475	struct device_attribute *attr, char *buf)
476	{
477	const struct net_device *netdev = to_net_dev(dev);
478	char tmp[IFALIASZ];
479	ssize_t ret = 0;
480
481	ret = dev_get_alias(netdev, tmp, sizeof(tmp));
482	if (ret > 0)
483	ret = sysfs_emit(buf, fmt: "%s\n", tmp);
484	return ret;
485	}
486	static DEVICE_ATTR_RW(ifalias);
487
488	static int change_group(struct net_device *dev, unsigned long new_group)
489	{
490	dev_set_group(dev, new_group: (int)new_group);
491	return 0;
492	}
493
494	static ssize_t group_store(struct device *dev, struct device_attribute *attr,
495	const char *buf, size_t len)
496	{
497	return netdev_store(dev, attr, buf, len, set: change_group);
498	}
499	NETDEVICE_SHOW(group, fmt_dec);
500	static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
501
502	static int change_proto_down(struct net_device *dev, unsigned long proto_down)
503	{
504	return dev_change_proto_down(dev, proto_down: (bool)proto_down);
505	}
506
507	static ssize_t proto_down_store(struct device *dev,
508	struct device_attribute *attr,
509	const char *buf, size_t len)
510	{
511	return netdev_store(dev, attr, buf, len, set: change_proto_down);
512	}
513	NETDEVICE_SHOW_RW(proto_down, fmt_dec);
514
515	static ssize_t phys_port_id_show(struct device *dev,
516	struct device_attribute *attr, char *buf)
517	{
518	struct net_device *netdev = to_net_dev(dev);
519	ssize_t ret = -EINVAL;
520
521	/* The check is also done in dev_get_phys_port_id; this helps returning
522	* early without hitting the trylock/restart below.
523	*/
524	if (!netdev->netdev_ops->ndo_get_phys_port_id)
525	return -EOPNOTSUPP;
526
527	if (!rtnl_trylock())
528	return restart_syscall();
529
530	if (dev_isalive(dev: netdev)) {
531	struct netdev_phys_item_id ppid;
532
533	ret = dev_get_phys_port_id(dev: netdev, ppid: &ppid);
534	if (!ret)
535	ret = sysfs_emit(buf, fmt: "%*phN\n", ppid.id_len, ppid.id);
536	}
537	rtnl_unlock();
538
539	return ret;
540	}
541	static DEVICE_ATTR_RO(phys_port_id);
542
543	static ssize_t phys_port_name_show(struct device *dev,
544	struct device_attribute *attr, char *buf)
545	{
546	struct net_device *netdev = to_net_dev(dev);
547	ssize_t ret = -EINVAL;
548
549	/* The checks are also done in dev_get_phys_port_name; this helps
550	* returning early without hitting the trylock/restart below.
551	*/
552	if (!netdev->netdev_ops->ndo_get_phys_port_name &&
553	!netdev->devlink_port)
554	return -EOPNOTSUPP;
555
556	if (!rtnl_trylock())
557	return restart_syscall();
558
559	if (dev_isalive(dev: netdev)) {
560	char name[IFNAMSIZ];
561
562	ret = dev_get_phys_port_name(dev: netdev, name, len: sizeof(name));
563	if (!ret)
564	ret = sysfs_emit(buf, fmt: "%s\n", name);
565	}
566	rtnl_unlock();
567
568	return ret;
569	}
570	static DEVICE_ATTR_RO(phys_port_name);
571
572	static ssize_t phys_switch_id_show(struct device *dev,
573	struct device_attribute *attr, char *buf)
574	{
575	struct net_device *netdev = to_net_dev(dev);
576	ssize_t ret = -EINVAL;
577
578	/* The checks are also done in dev_get_phys_port_name; this helps
579	* returning early without hitting the trylock/restart below. This works
580	* because recurse is false when calling dev_get_port_parent_id.
581	*/
582	if (!netdev->netdev_ops->ndo_get_port_parent_id &&
583	!netdev->devlink_port)
584	return -EOPNOTSUPP;
585
586	if (!rtnl_trylock())
587	return restart_syscall();
588
589	if (dev_isalive(dev: netdev)) {
590	struct netdev_phys_item_id ppid = { };
591
592	ret = dev_get_port_parent_id(dev: netdev, ppid: &ppid, recurse: false);
593	if (!ret)
594	ret = sysfs_emit(buf, fmt: "%*phN\n", ppid.id_len, ppid.id);
595	}
596	rtnl_unlock();
597
598	return ret;
599	}
600	static DEVICE_ATTR_RO(phys_switch_id);
601
602	static ssize_t threaded_show(struct device *dev,
603	struct device_attribute *attr, char *buf)
604	{
605	struct net_device *netdev = to_net_dev(dev);
606	ssize_t ret = -EINVAL;
607
608	if (!rtnl_trylock())
609	return restart_syscall();
610
611	if (dev_isalive(dev: netdev))
612	ret = sysfs_emit(buf, fmt: fmt_dec, netdev->threaded);
613
614	rtnl_unlock();
615	return ret;
616	}
617
618	static int modify_napi_threaded(struct net_device *dev, unsigned long val)
619	{
620	int ret;
621
622	if (list_empty(head: &dev->napi_list))
623	return -EOPNOTSUPP;
624
625	if (val != 0 && val != 1)
626	return -EOPNOTSUPP;
627
628	ret = dev_set_threaded(dev, threaded: val);
629
630	return ret;
631	}
632
633	static ssize_t threaded_store(struct device *dev,
634	struct device_attribute *attr,
635	const char *buf, size_t len)
636	{
637	return netdev_store(dev, attr, buf, len, set: modify_napi_threaded);
638	}
639	static DEVICE_ATTR_RW(threaded);
640
641	static struct attribute *net_class_attrs[] __ro_after_init = {
642	&dev_attr_netdev_group.attr,
643	&dev_attr_type.attr,
644	&dev_attr_dev_id.attr,
645	&dev_attr_dev_port.attr,
646	&dev_attr_iflink.attr,
647	&dev_attr_ifindex.attr,
648	&dev_attr_name_assign_type.attr,
649	&dev_attr_addr_assign_type.attr,
650	&dev_attr_addr_len.attr,
651	&dev_attr_link_mode.attr,
652	&dev_attr_address.attr,
653	&dev_attr_broadcast.attr,
654	&dev_attr_speed.attr,
655	&dev_attr_duplex.attr,
656	&dev_attr_dormant.attr,
657	&dev_attr_testing.attr,
658	&dev_attr_operstate.attr,
659	&dev_attr_carrier_changes.attr,
660	&dev_attr_ifalias.attr,
661	&dev_attr_carrier.attr,
662	&dev_attr_mtu.attr,
663	&dev_attr_flags.attr,
664	&dev_attr_tx_queue_len.attr,
665	&dev_attr_gro_flush_timeout.attr,
666	&dev_attr_napi_defer_hard_irqs.attr,
667	&dev_attr_phys_port_id.attr,
668	&dev_attr_phys_port_name.attr,
669	&dev_attr_phys_switch_id.attr,
670	&dev_attr_proto_down.attr,
671	&dev_attr_carrier_up_count.attr,
672	&dev_attr_carrier_down_count.attr,
673	&dev_attr_threaded.attr,
674	NULL,
675	};
676	ATTRIBUTE_GROUPS(net_class);
677
678	/* Show a given an attribute in the statistics group */
679	static ssize_t netstat_show(const struct device *d,
680	struct device_attribute *attr, char *buf,
681	unsigned long offset)
682	{
683	struct net_device *dev = to_net_dev(d);
684	ssize_t ret = -EINVAL;
685
686	WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
687	offset % sizeof(u64) != 0);
688
689	rcu_read_lock();
690	if (dev_isalive(dev)) {
691	struct rtnl_link_stats64 temp;
692	const struct rtnl_link_stats64 *stats = dev_get_stats(dev, storage: &temp);
693
694	ret = sysfs_emit(buf, fmt: fmt_u64, *(u64 *)(((u8 *)stats) + offset));
695	}
696	rcu_read_unlock();
697	return ret;
698	}
699
700	/* generate a read-only statistics attribute */
701	#define NETSTAT_ENTRY(name) \
702	static ssize_t name##_show(struct device *d, \
703	struct device_attribute *attr, char *buf) \
704	{ \
705	return netstat_show(d, attr, buf, \
706	offsetof(struct rtnl_link_stats64, name)); \
707	} \
708	static DEVICE_ATTR_RO(name)
709
710	NETSTAT_ENTRY(rx_packets);
711	NETSTAT_ENTRY(tx_packets);
712	NETSTAT_ENTRY(rx_bytes);
713	NETSTAT_ENTRY(tx_bytes);
714	NETSTAT_ENTRY(rx_errors);
715	NETSTAT_ENTRY(tx_errors);
716	NETSTAT_ENTRY(rx_dropped);
717	NETSTAT_ENTRY(tx_dropped);
718	NETSTAT_ENTRY(multicast);
719	NETSTAT_ENTRY(collisions);
720	NETSTAT_ENTRY(rx_length_errors);
721	NETSTAT_ENTRY(rx_over_errors);
722	NETSTAT_ENTRY(rx_crc_errors);
723	NETSTAT_ENTRY(rx_frame_errors);
724	NETSTAT_ENTRY(rx_fifo_errors);
725	NETSTAT_ENTRY(rx_missed_errors);
726	NETSTAT_ENTRY(tx_aborted_errors);
727	NETSTAT_ENTRY(tx_carrier_errors);
728	NETSTAT_ENTRY(tx_fifo_errors);
729	NETSTAT_ENTRY(tx_heartbeat_errors);
730	NETSTAT_ENTRY(tx_window_errors);
731	NETSTAT_ENTRY(rx_compressed);
732	NETSTAT_ENTRY(tx_compressed);
733	NETSTAT_ENTRY(rx_nohandler);
734
735	static struct attribute *netstat_attrs[] __ro_after_init = {
736	&dev_attr_rx_packets.attr,
737	&dev_attr_tx_packets.attr,
738	&dev_attr_rx_bytes.attr,
739	&dev_attr_tx_bytes.attr,
740	&dev_attr_rx_errors.attr,
741	&dev_attr_tx_errors.attr,
742	&dev_attr_rx_dropped.attr,
743	&dev_attr_tx_dropped.attr,
744	&dev_attr_multicast.attr,
745	&dev_attr_collisions.attr,
746	&dev_attr_rx_length_errors.attr,
747	&dev_attr_rx_over_errors.attr,
748	&dev_attr_rx_crc_errors.attr,
749	&dev_attr_rx_frame_errors.attr,
750	&dev_attr_rx_fifo_errors.attr,
751	&dev_attr_rx_missed_errors.attr,
752	&dev_attr_tx_aborted_errors.attr,
753	&dev_attr_tx_carrier_errors.attr,
754	&dev_attr_tx_fifo_errors.attr,
755	&dev_attr_tx_heartbeat_errors.attr,
756	&dev_attr_tx_window_errors.attr,
757	&dev_attr_rx_compressed.attr,
758	&dev_attr_tx_compressed.attr,
759	&dev_attr_rx_nohandler.attr,
760	NULL
761	};
762
763	static const struct attribute_group netstat_group = {
764	.name = "statistics",
765	.attrs = netstat_attrs,
766	};
767
768	static struct attribute *wireless_attrs[] = {
769	NULL
770	};
771
772	static const struct attribute_group wireless_group = {
773	.name = "wireless",
774	.attrs = wireless_attrs,
775	};
776
777	static bool wireless_group_needed(struct net_device *ndev)
778	{
779	#if IS_ENABLED(CONFIG_CFG80211)
780	if (ndev->ieee80211_ptr)
781	return true;
782	#endif
783	#if IS_ENABLED(CONFIG_WIRELESS_EXT)
784	if (ndev->wireless_handlers)
785	return true;
786	#endif
787	return false;
788	}
789
790	#else /* CONFIG_SYSFS */
791	#define net_class_groups NULL
792	#endif /* CONFIG_SYSFS */
793
794	#ifdef CONFIG_SYSFS
795	#define to_rx_queue_attr(_attr) \
796	container_of(_attr, struct rx_queue_attribute, attr)
797
798	#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
799
800	static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
801	char *buf)
802	{
803	const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
804	struct netdev_rx_queue *queue = to_rx_queue(kobj);
805
806	if (!attribute->show)
807	return -EIO;
808
809	return attribute->show(queue, buf);
810	}
811
812	static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
813	const char *buf, size_t count)
814	{
815	const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
816	struct netdev_rx_queue *queue = to_rx_queue(kobj);
817
818	if (!attribute->store)
819	return -EIO;
820
821	return attribute->store(queue, buf, count);
822	}
823
824	static const struct sysfs_ops rx_queue_sysfs_ops = {
825	.show = rx_queue_attr_show,
826	.store = rx_queue_attr_store,
827	};
828
829	#ifdef CONFIG_RPS
830	static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
831	{
832	struct rps_map *map;
833	cpumask_var_t mask;
834	int i, len;
835
836	if (!zalloc_cpumask_var(mask: &mask, GFP_KERNEL))
837	return -ENOMEM;
838
839	rcu_read_lock();
840	map = rcu_dereference(queue->rps_map);
841	if (map)
842	for (i = 0; i < map->len; i++)
843	cpumask_set_cpu(cpu: map->cpus[i], dstp: mask);
844
845	len = sysfs_emit(buf, fmt: "%*pb\n", cpumask_pr_args(mask));
846	rcu_read_unlock();
847	free_cpumask_var(mask);
848
849	return len < PAGE_SIZE ? len : -EINVAL;
850	}
851
852	static int netdev_rx_queue_set_rps_mask(struct netdev_rx_queue *queue,
853	cpumask_var_t mask)
854	{
855	static DEFINE_MUTEX(rps_map_mutex);
856	struct rps_map *old_map, *map;
857	int cpu, i;
858
859	map = kzalloc(max_t(unsigned int,
860	RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
861	GFP_KERNEL);
862	if (!map)
863	return -ENOMEM;
864
865	i = 0;
866	for_each_cpu_and(cpu, mask, cpu_online_mask)
867	map->cpus[i++] = cpu;
868
869	if (i) {
870	map->len = i;
871	} else {
872	kfree(objp: map);
873	map = NULL;
874	}
875
876	mutex_lock(&rps_map_mutex);
877	old_map = rcu_dereference_protected(queue->rps_map,
878	mutex_is_locked(&rps_map_mutex));
879	rcu_assign_pointer(queue->rps_map, map);
880
881	if (map)
882	static_branch_inc(&rps_needed);
883	if (old_map)
884	static_branch_dec(&rps_needed);
885
886	mutex_unlock(lock: &rps_map_mutex);
887
888	if (old_map)
889	kfree_rcu(old_map, rcu);
890	return 0;
891	}
892
893	int rps_cpumask_housekeeping(struct cpumask *mask)
894	{
895	if (!cpumask_empty(srcp: mask)) {
896	cpumask_and(dstp: mask, src1p: mask, src2p: housekeeping_cpumask(type: HK_TYPE_DOMAIN));
897	cpumask_and(dstp: mask, src1p: mask, src2p: housekeeping_cpumask(type: HK_TYPE_WQ));
898	if (cpumask_empty(srcp: mask))
899	return -EINVAL;
900	}
901	return 0;
902	}
903
904	static ssize_t store_rps_map(struct netdev_rx_queue *queue,
905	const char *buf, size_t len)
906	{
907	cpumask_var_t mask;
908	int err;
909
910	if (!capable(CAP_NET_ADMIN))
911	return -EPERM;
912
913	if (!alloc_cpumask_var(mask: &mask, GFP_KERNEL))
914	return -ENOMEM;
915
916	err = bitmap_parse(buf, buflen: len, cpumask_bits(mask), nr_cpumask_bits);
917	if (err)
918	goto out;
919
920	err = rps_cpumask_housekeeping(mask);
921	if (err)
922	goto out;
923
924	err = netdev_rx_queue_set_rps_mask(queue, mask);
925
926	out:
927	free_cpumask_var(mask);
928	return err ? : len;
929	}
930
931	static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
932	char *buf)
933	{
934	struct rps_dev_flow_table *flow_table;
935	unsigned long val = 0;
936
937	rcu_read_lock();
938	flow_table = rcu_dereference(queue->rps_flow_table);
939	if (flow_table)
940	val = (unsigned long)flow_table->mask + 1;
941	rcu_read_unlock();
942
943	return sysfs_emit(buf, fmt: "%lu\n", val);
944	}
945
946	static void rps_dev_flow_table_release(struct rcu_head *rcu)
947	{
948	struct rps_dev_flow_table *table = container_of(rcu,
949	struct rps_dev_flow_table, rcu);
950	vfree(addr: table);
951	}
952
953	static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
954	const char *buf, size_t len)
955	{
956	unsigned long mask, count;
957	struct rps_dev_flow_table *table, *old_table;
958	static DEFINE_SPINLOCK(rps_dev_flow_lock);
959	int rc;
960
961	if (!capable(CAP_NET_ADMIN))
962	return -EPERM;
963
964	rc = kstrtoul(s: buf, base: 0, res: &count);
965	if (rc < 0)
966	return rc;
967
968	if (count) {
969	mask = count - 1;
970	/* mask = roundup_pow_of_two(count) - 1;
971	* without overflows...
972	*/
973	while ((mask | (mask >> 1)) != mask)
974	mask |= (mask >> 1);
975	/* On 64 bit arches, must check mask fits in table->mask (u32),
976	* and on 32bit arches, must check
977	* RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
978	*/
979	#if BITS_PER_LONG > 32
980	if (mask > (unsigned long)(u32)mask)
981	return -EINVAL;
982	#else
983	if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
984	/ sizeof(struct rps_dev_flow)) {
985	/* Enforce a limit to prevent overflow */
986	return -EINVAL;
987	}
988	#endif
989	table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
990	if (!table)
991	return -ENOMEM;
992
993	table->mask = mask;
994	for (count = 0; count <= mask; count++)
995	table->flows[count].cpu = RPS_NO_CPU;
996	} else {
997	table = NULL;
998	}
999
1000	spin_lock(lock: &rps_dev_flow_lock);
1001	old_table = rcu_dereference_protected(queue->rps_flow_table,
1002	lockdep_is_held(&rps_dev_flow_lock));
1003	rcu_assign_pointer(queue->rps_flow_table, table);
1004	spin_unlock(lock: &rps_dev_flow_lock);
1005
1006	if (old_table)
1007	call_rcu(head: &old_table->rcu, func: rps_dev_flow_table_release);
1008
1009	return len;
1010	}
1011
1012	static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
1013	= __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
1014
1015	static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
1016	= __ATTR(rps_flow_cnt, 0644,
1017	show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
1018	#endif /* CONFIG_RPS */
1019
1020	static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
1021	#ifdef CONFIG_RPS
1022	&rps_cpus_attribute.attr,
1023	&rps_dev_flow_table_cnt_attribute.attr,
1024	#endif
1025	NULL
1026	};
1027	ATTRIBUTE_GROUPS(rx_queue_default);
1028
1029	static void rx_queue_release(struct kobject *kobj)
1030	{
1031	struct netdev_rx_queue *queue = to_rx_queue(kobj);
1032	#ifdef CONFIG_RPS
1033	struct rps_map *map;
1034	struct rps_dev_flow_table *flow_table;
1035
1036	map = rcu_dereference_protected(queue->rps_map, 1);
1037	if (map) {
1038	RCU_INIT_POINTER(queue->rps_map, NULL);
1039	kfree_rcu(map, rcu);
1040	}
1041
1042	flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
1043	if (flow_table) {
1044	RCU_INIT_POINTER(queue->rps_flow_table, NULL);
1045	call_rcu(head: &flow_table->rcu, func: rps_dev_flow_table_release);
1046	}
1047	#endif
1048
1049	memset(kobj, 0, sizeof(*kobj));
1050	netdev_put(dev: queue->dev, tracker: &queue->dev_tracker);
1051	}
1052
1053	static const void *rx_queue_namespace(const struct kobject *kobj)
1054	{
1055	struct netdev_rx_queue *queue = to_rx_queue(kobj);
1056	struct device *dev = &queue->dev->dev;
1057	const void *ns = NULL;
1058
1059	if (dev->class && dev->class->ns_type)
1060	ns = dev->class->namespace(dev);
1061
1062	return ns;
1063	}
1064
1065	static void rx_queue_get_ownership(const struct kobject *kobj,
1066	kuid_t *uid, kgid_t *gid)
1067	{
1068	const struct net *net = rx_queue_namespace(kobj);
1069
1070	net_ns_get_ownership(net, uid, gid);
1071	}
1072
1073	static const struct kobj_type rx_queue_ktype = {
1074	.sysfs_ops = &rx_queue_sysfs_ops,
1075	.release = rx_queue_release,
1076	.default_groups = rx_queue_default_groups,
1077	.namespace = rx_queue_namespace,
1078	.get_ownership = rx_queue_get_ownership,
1079	};
1080
1081	static int rx_queue_default_mask(struct net_device *dev,
1082	struct netdev_rx_queue *queue)
1083	{
1084	#if IS_ENABLED(CONFIG_RPS) && IS_ENABLED(CONFIG_SYSCTL)
1085	struct cpumask *rps_default_mask = READ_ONCE(dev_net(dev)->core.rps_default_mask);
1086
1087	if (rps_default_mask && !cpumask_empty(srcp: rps_default_mask))
1088	return netdev_rx_queue_set_rps_mask(queue, mask: rps_default_mask);
1089	#endif
1090	return 0;
1091	}
1092
1093	static int rx_queue_add_kobject(struct net_device *dev, int index)
1094	{
1095	struct netdev_rx_queue *queue = dev->_rx + index;
1096	struct kobject *kobj = &queue->kobj;
1097	int error = 0;
1098
1099	/* Kobject_put later will trigger rx_queue_release call which
1100	* decreases dev refcount: Take that reference here
1101	*/
1102	netdev_hold(dev: queue->dev, tracker: &queue->dev_tracker, GFP_KERNEL);
1103
1104	kobj->kset = dev->queues_kset;
1105	error = kobject_init_and_add(kobj, ktype: &rx_queue_ktype, NULL,
1106	fmt: "rx-%u", index);
1107	if (error)
1108	goto err;
1109
1110	if (dev->sysfs_rx_queue_group) {
1111	error = sysfs_create_group(kobj, grp: dev->sysfs_rx_queue_group);
1112	if (error)
1113	goto err;
1114	}
1115
1116	error = rx_queue_default_mask(dev, queue);
1117	if (error)
1118	goto err;
1119
1120	kobject_uevent(kobj, action: KOBJ_ADD);
1121
1122	return error;
1123
1124	err:
1125	kobject_put(kobj);
1126	return error;
1127	}
1128
1129	static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
1130	kgid_t kgid)
1131	{
1132	struct netdev_rx_queue *queue = dev->_rx + index;
1133	struct kobject *kobj = &queue->kobj;
1134	int error;
1135
1136	error = sysfs_change_owner(kobj, kuid, kgid);
1137	if (error)
1138	return error;
1139
1140	if (dev->sysfs_rx_queue_group)
1141	error = sysfs_group_change_owner(
1142	kobj, groups: dev->sysfs_rx_queue_group, kuid, kgid);
1143
1144	return error;
1145	}
1146	#endif /* CONFIG_SYSFS */
1147
1148	int
1149	net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1150	{
1151	#ifdef CONFIG_SYSFS
1152	int i;
1153	int error = 0;
1154
1155	#ifndef CONFIG_RPS
1156	if (!dev->sysfs_rx_queue_group)
1157	return 0;
1158	#endif
1159	for (i = old_num; i < new_num; i++) {
1160	error = rx_queue_add_kobject(dev, index: i);
1161	if (error) {
1162	new_num = old_num;
1163	break;
1164	}
1165	}
1166
1167	while (--i >= new_num) {
1168	struct kobject *kobj = &dev->_rx[i].kobj;
1169
1170	if (!refcount_read(r: &dev_net(dev)->ns.count))
1171	kobj->uevent_suppress = 1;
1172	if (dev->sysfs_rx_queue_group)
1173	sysfs_remove_group(kobj, grp: dev->sysfs_rx_queue_group);
1174	kobject_put(kobj);
1175	}
1176
1177	return error;
1178	#else
1179	return 0;
1180	#endif
1181	}
1182
1183	static int net_rx_queue_change_owner(struct net_device *dev, int num,
1184	kuid_t kuid, kgid_t kgid)
1185	{
1186	#ifdef CONFIG_SYSFS
1187	int error = 0;
1188	int i;
1189
1190	#ifndef CONFIG_RPS
1191	if (!dev->sysfs_rx_queue_group)
1192	return 0;
1193	#endif
1194	for (i = 0; i < num; i++) {
1195	error = rx_queue_change_owner(dev, index: i, kuid, kgid);
1196	if (error)
1197	break;
1198	}
1199
1200	return error;
1201	#else
1202	return 0;
1203	#endif
1204	}
1205
1206	#ifdef CONFIG_SYSFS
1207	/*
1208	* netdev_queue sysfs structures and functions.
1209	*/
1210	struct netdev_queue_attribute {
1211	struct attribute attr;
1212	ssize_t (*show)(struct netdev_queue *queue, char *buf);
1213	ssize_t (*store)(struct netdev_queue *queue,
1214	const char *buf, size_t len);
1215	};
1216	#define to_netdev_queue_attr(_attr) \
1217	container_of(_attr, struct netdev_queue_attribute, attr)
1218
1219	#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1220
1221	static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1222	struct attribute *attr, char *buf)
1223	{
1224	const struct netdev_queue_attribute *attribute
1225	= to_netdev_queue_attr(attr);
1226	struct netdev_queue *queue = to_netdev_queue(kobj);
1227
1228	if (!attribute->show)
1229	return -EIO;
1230
1231	return attribute->show(queue, buf);
1232	}
1233
1234	static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1235	struct attribute *attr,
1236	const char *buf, size_t count)
1237	{
1238	const struct netdev_queue_attribute *attribute
1239	= to_netdev_queue_attr(attr);
1240	struct netdev_queue *queue = to_netdev_queue(kobj);
1241
1242	if (!attribute->store)
1243	return -EIO;
1244
1245	return attribute->store(queue, buf, count);
1246	}
1247
1248	static const struct sysfs_ops netdev_queue_sysfs_ops = {
1249	.show = netdev_queue_attr_show,
1250	.store = netdev_queue_attr_store,
1251	};
1252
1253	static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1254	{
1255	unsigned long trans_timeout = atomic_long_read(v: &queue->trans_timeout);
1256
1257	return sysfs_emit(buf, fmt: fmt_ulong, trans_timeout);
1258	}
1259
1260	static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1261	{
1262	struct net_device *dev = queue->dev;
1263	unsigned int i;
1264
1265	i = queue - dev->_tx;
1266	BUG_ON(i >= dev->num_tx_queues);
1267
1268	return i;
1269	}
1270
1271	static ssize_t traffic_class_show(struct netdev_queue *queue,
1272	char *buf)
1273	{
1274	struct net_device *dev = queue->dev;
1275	int num_tc, tc;
1276	int index;
1277
1278	if (!netif_is_multiqueue(dev))
1279	return -ENOENT;
1280
1281	if (!rtnl_trylock())
1282	return restart_syscall();
1283
1284	index = get_netdev_queue_index(queue);
1285
1286	/* If queue belongs to subordinate dev use its TC mapping */
1287	dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1288
1289	num_tc = dev->num_tc;
1290	tc = netdev_txq_to_tc(dev, txq: index);
1291
1292	rtnl_unlock();
1293
1294	if (tc < 0)
1295	return -EINVAL;
1296
1297	/* We can report the traffic class one of two ways:
1298	* Subordinate device traffic classes are reported with the traffic
1299	* class first, and then the subordinate class so for example TC0 on
1300	* subordinate device 2 will be reported as "0-2". If the queue
1301	* belongs to the root device it will be reported with just the
1302	* traffic class, so just "0" for TC 0 for example.
1303	*/
1304	return num_tc < 0 ? sysfs_emit(buf, fmt: "%d%d\n", tc, num_tc) :
1305	sysfs_emit(buf, fmt: "%d\n", tc);
1306	}
1307
1308	#ifdef CONFIG_XPS
1309	static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1310	char *buf)
1311	{
1312	return sysfs_emit(buf, fmt: "%lu\n", queue->tx_maxrate);
1313	}
1314
1315	static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1316	const char *buf, size_t len)
1317	{
1318	struct net_device *dev = queue->dev;
1319	int err, index = get_netdev_queue_index(queue);
1320	u32 rate = 0;
1321
1322	if (!capable(CAP_NET_ADMIN))
1323	return -EPERM;
1324
1325	/* The check is also done later; this helps returning early without
1326	* hitting the trylock/restart below.
1327	*/
1328	if (!dev->netdev_ops->ndo_set_tx_maxrate)
1329	return -EOPNOTSUPP;
1330
1331	err = kstrtou32(s: buf, base: 10, res: &rate);
1332	if (err < 0)
1333	return err;
1334
1335	if (!rtnl_trylock())
1336	return restart_syscall();
1337
1338	err = -EOPNOTSUPP;
1339	if (dev->netdev_ops->ndo_set_tx_maxrate)
1340	err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1341
1342	rtnl_unlock();
1343	if (!err) {
1344	queue->tx_maxrate = rate;
1345	return len;
1346	}
1347	return err;
1348	}
1349
1350	static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1351	= __ATTR_RW(tx_maxrate);
1352	#endif
1353
1354	static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1355	= __ATTR_RO(tx_timeout);
1356
1357	static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1358	= __ATTR_RO(traffic_class);
1359
1360	#ifdef CONFIG_BQL
1361	/*
1362	* Byte queue limits sysfs structures and functions.
1363	*/
1364	static ssize_t bql_show(char *buf, unsigned int value)
1365	{
1366	return sysfs_emit(buf, fmt: "%u\n", value);
1367	}
1368
1369	static ssize_t bql_set(const char *buf, const size_t count,
1370	unsigned int *pvalue)
1371	{
1372	unsigned int value;
1373	int err;
1374
1375	if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1376	value = DQL_MAX_LIMIT;
1377	} else {
1378	err = kstrtouint(s: buf, base: 10, res: &value);
1379	if (err < 0)
1380	return err;
1381	if (value > DQL_MAX_LIMIT)
1382	return -EINVAL;
1383	}
1384
1385	*pvalue = value;
1386
1387	return count;
1388	}
1389
1390	static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1391	char *buf)
1392	{
1393	struct dql *dql = &queue->dql;
1394
1395	return sysfs_emit(buf, fmt: "%u\n", jiffies_to_msecs(j: dql->slack_hold_time));
1396	}
1397
1398	static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1399	const char *buf, size_t len)
1400	{
1401	struct dql *dql = &queue->dql;
1402	unsigned int value;
1403	int err;
1404
1405	err = kstrtouint(s: buf, base: 10, res: &value);
1406	if (err < 0)
1407	return err;
1408
1409	dql->slack_hold_time = msecs_to_jiffies(m: value);
1410
1411	return len;
1412	}
1413
1414	static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1415	= __ATTR(hold_time, 0644,
1416	bql_show_hold_time, bql_set_hold_time);
1417
1418	static ssize_t bql_show_stall_thrs(struct netdev_queue *queue, char *buf)
1419	{
1420	struct dql *dql = &queue->dql;
1421
1422	return sprintf(buf, fmt: "%u\n", jiffies_to_msecs(j: dql->stall_thrs));
1423	}
1424
1425	static ssize_t bql_set_stall_thrs(struct netdev_queue *queue,
1426	const char *buf, size_t len)
1427	{
1428	struct dql *dql = &queue->dql;
1429	unsigned int value;
1430	int err;
1431
1432	err = kstrtouint(s: buf, base: 10, res: &value);
1433	if (err < 0)
1434	return err;
1435
1436	value = msecs_to_jiffies(m: value);
1437	if (value && (value < 4 || value > 4 / 2 * BITS_PER_LONG))
1438	return -ERANGE;
1439
1440	if (!dql->stall_thrs && value)
1441	dql->last_reap = jiffies;
1442	/* Force last_reap to be live */
1443	smp_wmb();
1444	dql->stall_thrs = value;
1445
1446	return len;
1447	}
1448
1449	static struct netdev_queue_attribute bql_stall_thrs_attribute __ro_after_init =
1450	__ATTR(stall_thrs, 0644, bql_show_stall_thrs, bql_set_stall_thrs);
1451
1452	static ssize_t bql_show_stall_max(struct netdev_queue *queue, char *buf)
1453	{
1454	return sprintf(buf, fmt: "%u\n", READ_ONCE(queue->dql.stall_max));
1455	}
1456
1457	static ssize_t bql_set_stall_max(struct netdev_queue *queue,
1458	const char *buf, size_t len)
1459	{
1460	WRITE_ONCE(queue->dql.stall_max, 0);
1461	return len;
1462	}
1463
1464	static struct netdev_queue_attribute bql_stall_max_attribute __ro_after_init =
1465	__ATTR(stall_max, 0644, bql_show_stall_max, bql_set_stall_max);
1466
1467	static ssize_t bql_show_stall_cnt(struct netdev_queue *queue, char *buf)
1468	{
1469	struct dql *dql = &queue->dql;
1470
1471	return sprintf(buf, fmt: "%lu\n", dql->stall_cnt);
1472	}
1473
1474	static struct netdev_queue_attribute bql_stall_cnt_attribute __ro_after_init =
1475	__ATTR(stall_cnt, 0444, bql_show_stall_cnt, NULL);
1476
1477	static ssize_t bql_show_inflight(struct netdev_queue *queue,
1478	char *buf)
1479	{
1480	struct dql *dql = &queue->dql;
1481
1482	return sysfs_emit(buf, fmt: "%u\n", dql->num_queued - dql->num_completed);
1483	}
1484
1485	static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1486	__ATTR(inflight, 0444, bql_show_inflight, NULL);
1487
1488	#define BQL_ATTR(NAME, FIELD) \
1489	static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
1490	char *buf) \
1491	{ \
1492	return bql_show(buf, queue->dql.FIELD); \
1493	} \
1494	\
1495	static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
1496	const char *buf, size_t len) \
1497	{ \
1498	return bql_set(buf, len, &queue->dql.FIELD); \
1499	} \
1500	\
1501	static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1502	= __ATTR(NAME, 0644, \
1503	bql_show_ ## NAME, bql_set_ ## NAME)
1504
1505	BQL_ATTR(limit, limit);
1506	BQL_ATTR(limit_max, max_limit);
1507	BQL_ATTR(limit_min, min_limit);
1508
1509	static struct attribute *dql_attrs[] __ro_after_init = {
1510	&bql_limit_attribute.attr,
1511	&bql_limit_max_attribute.attr,
1512	&bql_limit_min_attribute.attr,
1513	&bql_hold_time_attribute.attr,
1514	&bql_inflight_attribute.attr,
1515	&bql_stall_thrs_attribute.attr,
1516	&bql_stall_cnt_attribute.attr,
1517	&bql_stall_max_attribute.attr,
1518	NULL
1519	};
1520
1521	static const struct attribute_group dql_group = {
1522	.name = "byte_queue_limits",
1523	.attrs = dql_attrs,
1524	};
1525	#else
1526	/* Fake declaration, all the code using it should be dead */
1527	extern const struct attribute_group dql_group;
1528	#endif /* CONFIG_BQL */
1529
1530	#ifdef CONFIG_XPS
1531	static ssize_t xps_queue_show(struct net_device *dev, unsigned int index,
1532	int tc, char *buf, enum xps_map_type type)
1533	{
1534	struct xps_dev_maps *dev_maps;
1535	unsigned long *mask;
1536	unsigned int nr_ids;
1537	int j, len;
1538
1539	rcu_read_lock();
1540	dev_maps = rcu_dereference(dev->xps_maps[type]);
1541
1542	/* Default to nr_cpu_ids/dev->num_rx_queues and do not just return 0
1543	* when dev_maps hasn't been allocated yet, to be backward compatible.
1544	*/
1545	nr_ids = dev_maps ? dev_maps->nr_ids :
1546	(type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues);
1547
1548	mask = bitmap_zalloc(nbits: nr_ids, GFP_NOWAIT);
1549	if (!mask) {
1550	rcu_read_unlock();
1551	return -ENOMEM;
1552	}
1553
1554	if (!dev_maps || tc >= dev_maps->num_tc)
1555	goto out_no_maps;
1556
1557	for (j = 0; j < nr_ids; j++) {
1558	int i, tci = j * dev_maps->num_tc + tc;
1559	struct xps_map *map;
1560
1561	map = rcu_dereference(dev_maps->attr_map[tci]);
1562	if (!map)
1563	continue;
1564
1565	for (i = map->len; i--;) {
1566	if (map->queues[i] == index) {
1567	__set_bit(j, mask);
1568	break;
1569	}
1570	}
1571	}
1572	out_no_maps:
1573	rcu_read_unlock();
1574
1575	len = bitmap_print_to_pagebuf(list: false, buf, maskp: mask, nmaskbits: nr_ids);
1576	bitmap_free(bitmap: mask);
1577
1578	return len < PAGE_SIZE ? len : -EINVAL;
1579	}
1580
1581	static ssize_t xps_cpus_show(struct netdev_queue *queue, char *buf)
1582	{
1583	struct net_device *dev = queue->dev;
1584	unsigned int index;
1585	int len, tc;
1586
1587	if (!netif_is_multiqueue(dev))
1588	return -ENOENT;
1589
1590	index = get_netdev_queue_index(queue);
1591
1592	if (!rtnl_trylock())
1593	return restart_syscall();
1594
1595	/* If queue belongs to subordinate dev use its map */
1596	dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1597
1598	tc = netdev_txq_to_tc(dev, txq: index);
1599	if (tc < 0) {
1600	rtnl_unlock();
1601	return -EINVAL;
1602	}
1603
1604	/* Make sure the subordinate device can't be freed */
1605	get_device(dev: &dev->dev);
1606	rtnl_unlock();
1607
1608	len = xps_queue_show(dev, index, tc, buf, type: XPS_CPUS);
1609
1610	put_device(dev: &dev->dev);
1611	return len;
1612	}
1613
1614	static ssize_t xps_cpus_store(struct netdev_queue *queue,
1615	const char *buf, size_t len)
1616	{
1617	struct net_device *dev = queue->dev;
1618	unsigned int index;
1619	cpumask_var_t mask;
1620	int err;
1621
1622	if (!netif_is_multiqueue(dev))
1623	return -ENOENT;
1624
1625	if (!capable(CAP_NET_ADMIN))
1626	return -EPERM;
1627
1628	if (!alloc_cpumask_var(mask: &mask, GFP_KERNEL))
1629	return -ENOMEM;
1630
1631	index = get_netdev_queue_index(queue);
1632
1633	err = bitmap_parse(buf, buflen: len, cpumask_bits(mask), nr_cpumask_bits);
1634	if (err) {
1635	free_cpumask_var(mask);
1636	return err;
1637	}
1638
1639	if (!rtnl_trylock()) {
1640	free_cpumask_var(mask);
1641	return restart_syscall();
1642	}
1643
1644	err = netif_set_xps_queue(dev, mask, index);
1645	rtnl_unlock();
1646
1647	free_cpumask_var(mask);
1648
1649	return err ? : len;
1650	}
1651
1652	static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1653	= __ATTR_RW(xps_cpus);
1654
1655	static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1656	{
1657	struct net_device *dev = queue->dev;
1658	unsigned int index;
1659	int tc;
1660
1661	index = get_netdev_queue_index(queue);
1662
1663	if (!rtnl_trylock())
1664	return restart_syscall();
1665
1666	tc = netdev_txq_to_tc(dev, txq: index);
1667	rtnl_unlock();
1668	if (tc < 0)
1669	return -EINVAL;
1670
1671	return xps_queue_show(dev, index, tc, buf, type: XPS_RXQS);
1672	}
1673
1674	static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1675	size_t len)
1676	{
1677	struct net_device *dev = queue->dev;
1678	struct net *net = dev_net(dev);
1679	unsigned long *mask;
1680	unsigned int index;
1681	int err;
1682
1683	if (!ns_capable(ns: net->user_ns, CAP_NET_ADMIN))
1684	return -EPERM;
1685
1686	mask = bitmap_zalloc(nbits: dev->num_rx_queues, GFP_KERNEL);
1687	if (!mask)
1688	return -ENOMEM;
1689
1690	index = get_netdev_queue_index(queue);
1691
1692	err = bitmap_parse(buf, buflen: len, dst: mask, nbits: dev->num_rx_queues);
1693	if (err) {
1694	bitmap_free(bitmap: mask);
1695	return err;
1696	}
1697
1698	if (!rtnl_trylock()) {
1699	bitmap_free(bitmap: mask);
1700	return restart_syscall();
1701	}
1702
1703	cpus_read_lock();
1704	err = __netif_set_xps_queue(dev, mask, index, type: XPS_RXQS);
1705	cpus_read_unlock();
1706
1707	rtnl_unlock();
1708
1709	bitmap_free(bitmap: mask);
1710	return err ? : len;
1711	}
1712
1713	static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1714	= __ATTR_RW(xps_rxqs);
1715	#endif /* CONFIG_XPS */
1716
1717	static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1718	&queue_trans_timeout.attr,
1719	&queue_traffic_class.attr,
1720	#ifdef CONFIG_XPS
1721	&xps_cpus_attribute.attr,
1722	&xps_rxqs_attribute.attr,
1723	&queue_tx_maxrate.attr,
1724	#endif
1725	NULL
1726	};
1727	ATTRIBUTE_GROUPS(netdev_queue_default);
1728
1729	static void netdev_queue_release(struct kobject *kobj)
1730	{
1731	struct netdev_queue *queue = to_netdev_queue(kobj);
1732
1733	memset(kobj, 0, sizeof(*kobj));
1734	netdev_put(dev: queue->dev, tracker: &queue->dev_tracker);
1735	}
1736
1737	static const void *netdev_queue_namespace(const struct kobject *kobj)
1738	{
1739	struct netdev_queue *queue = to_netdev_queue(kobj);
1740	struct device *dev = &queue->dev->dev;
1741	const void *ns = NULL;
1742
1743	if (dev->class && dev->class->ns_type)
1744	ns = dev->class->namespace(dev);
1745
1746	return ns;
1747	}
1748
1749	static void netdev_queue_get_ownership(const struct kobject *kobj,
1750	kuid_t *uid, kgid_t *gid)
1751	{
1752	const struct net *net = netdev_queue_namespace(kobj);
1753
1754	net_ns_get_ownership(net, uid, gid);
1755	}
1756
1757	static const struct kobj_type netdev_queue_ktype = {
1758	.sysfs_ops = &netdev_queue_sysfs_ops,
1759	.release = netdev_queue_release,
1760	.default_groups = netdev_queue_default_groups,
1761	.namespace = netdev_queue_namespace,
1762	.get_ownership = netdev_queue_get_ownership,
1763	};
1764
1765	static bool netdev_uses_bql(const struct net_device *dev)
1766	{
1767	if (dev->features & NETIF_F_LLTX ||
1768	dev->priv_flags & IFF_NO_QUEUE)
1769	return false;
1770
1771	return IS_ENABLED(CONFIG_BQL);
1772	}
1773
1774	static int netdev_queue_add_kobject(struct net_device *dev, int index)
1775	{
1776	struct netdev_queue *queue = dev->_tx + index;
1777	struct kobject *kobj = &queue->kobj;
1778	int error = 0;
1779
1780	/* Kobject_put later will trigger netdev_queue_release call
1781	* which decreases dev refcount: Take that reference here
1782	*/
1783	netdev_hold(dev: queue->dev, tracker: &queue->dev_tracker, GFP_KERNEL);
1784
1785	kobj->kset = dev->queues_kset;
1786	error = kobject_init_and_add(kobj, ktype: &netdev_queue_ktype, NULL,
1787	fmt: "tx-%u", index);
1788	if (error)
1789	goto err;
1790
1791	if (netdev_uses_bql(dev)) {
1792	error = sysfs_create_group(kobj, grp: &dql_group);
1793	if (error)
1794	goto err;
1795	}
1796
1797	kobject_uevent(kobj, action: KOBJ_ADD);
1798	return 0;
1799
1800	err:
1801	kobject_put(kobj);
1802	return error;
1803	}
1804
1805	static int tx_queue_change_owner(struct net_device *ndev, int index,
1806	kuid_t kuid, kgid_t kgid)
1807	{
1808	struct netdev_queue *queue = ndev->_tx + index;
1809	struct kobject *kobj = &queue->kobj;
1810	int error;
1811
1812	error = sysfs_change_owner(kobj, kuid, kgid);
1813	if (error)
1814	return error;
1815
1816	if (netdev_uses_bql(dev: ndev))
1817	error = sysfs_group_change_owner(kobj, groups: &dql_group, kuid, kgid);
1818
1819	return error;
1820	}
1821	#endif /* CONFIG_SYSFS */
1822
1823	int
1824	netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1825	{
1826	#ifdef CONFIG_SYSFS
1827	int i;
1828	int error = 0;
1829
1830	/* Tx queue kobjects are allowed to be updated when a device is being
1831	* unregistered, but solely to remove queues from qdiscs. Any path
1832	* adding queues should be fixed.
1833	*/
1834	WARN(dev->reg_state == NETREG_UNREGISTERING && new_num > old_num,
1835	"New queues can't be registered after device unregistration.");
1836
1837	for (i = old_num; i < new_num; i++) {
1838	error = netdev_queue_add_kobject(dev, index: i);
1839	if (error) {
1840	new_num = old_num;
1841	break;
1842	}
1843	}
1844
1845	while (--i >= new_num) {
1846	struct netdev_queue *queue = dev->_tx + i;
1847
1848	if (!refcount_read(r: &dev_net(dev)->ns.count))
1849	queue->kobj.uevent_suppress = 1;
1850
1851	if (netdev_uses_bql(dev))
1852	sysfs_remove_group(kobj: &queue->kobj, grp: &dql_group);
1853
1854	kobject_put(kobj: &queue->kobj);
1855	}
1856
1857	return error;
1858	#else
1859	return 0;
1860	#endif /* CONFIG_SYSFS */
1861	}
1862
1863	static int net_tx_queue_change_owner(struct net_device *dev, int num,
1864	kuid_t kuid, kgid_t kgid)
1865	{
1866	#ifdef CONFIG_SYSFS
1867	int error = 0;
1868	int i;
1869
1870	for (i = 0; i < num; i++) {
1871	error = tx_queue_change_owner(ndev: dev, index: i, kuid, kgid);
1872	if (error)
1873	break;
1874	}
1875
1876	return error;
1877	#else
1878	return 0;
1879	#endif /* CONFIG_SYSFS */
1880	}
1881
1882	static int register_queue_kobjects(struct net_device *dev)
1883	{
1884	int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1885
1886	#ifdef CONFIG_SYSFS
1887	dev->queues_kset = kset_create_and_add(name: "queues",
1888	NULL, parent_kobj: &dev->dev.kobj);
1889	if (!dev->queues_kset)
1890	return -ENOMEM;
1891	real_rx = dev->real_num_rx_queues;
1892	#endif
1893	real_tx = dev->real_num_tx_queues;
1894
1895	error = net_rx_queue_update_kobjects(dev, old_num: 0, new_num: real_rx);
1896	if (error)
1897	goto error;
1898	rxq = real_rx;
1899
1900	error = netdev_queue_update_kobjects(dev, old_num: 0, new_num: real_tx);
1901	if (error)
1902	goto error;
1903	txq = real_tx;
1904
1905	return 0;
1906
1907	error:
1908	netdev_queue_update_kobjects(dev, old_num: txq, new_num: 0);
1909	net_rx_queue_update_kobjects(dev, old_num: rxq, new_num: 0);
1910	#ifdef CONFIG_SYSFS
1911	kset_unregister(kset: dev->queues_kset);
1912	#endif
1913	return error;
1914	}
1915
1916	static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
1917	{
1918	int error = 0, real_rx = 0, real_tx = 0;
1919
1920	#ifdef CONFIG_SYSFS
1921	if (ndev->queues_kset) {
1922	error = sysfs_change_owner(kobj: &ndev->queues_kset->kobj, kuid, kgid);
1923	if (error)
1924	return error;
1925	}
1926	real_rx = ndev->real_num_rx_queues;
1927	#endif
1928	real_tx = ndev->real_num_tx_queues;
1929
1930	error = net_rx_queue_change_owner(dev: ndev, num: real_rx, kuid, kgid);
1931	if (error)
1932	return error;
1933
1934	error = net_tx_queue_change_owner(dev: ndev, num: real_tx, kuid, kgid);
1935	if (error)
1936	return error;
1937
1938	return 0;
1939	}
1940
1941	static void remove_queue_kobjects(struct net_device *dev)
1942	{
1943	int real_rx = 0, real_tx = 0;
1944
1945	#ifdef CONFIG_SYSFS
1946	real_rx = dev->real_num_rx_queues;
1947	#endif
1948	real_tx = dev->real_num_tx_queues;
1949
1950	net_rx_queue_update_kobjects(dev, old_num: real_rx, new_num: 0);
1951	netdev_queue_update_kobjects(dev, old_num: real_tx, new_num: 0);
1952
1953	dev->real_num_rx_queues = 0;
1954	dev->real_num_tx_queues = 0;
1955	#ifdef CONFIG_SYSFS
1956	kset_unregister(kset: dev->queues_kset);
1957	#endif
1958	}
1959
1960	static bool net_current_may_mount(void)
1961	{
1962	struct net *net = current->nsproxy->net_ns;
1963
1964	return ns_capable(ns: net->user_ns, CAP_SYS_ADMIN);
1965	}
1966
1967	static void *net_grab_current_ns(void)
1968	{
1969	struct net *ns = current->nsproxy->net_ns;
1970	#ifdef CONFIG_NET_NS
1971	if (ns)
1972	refcount_inc(r: &ns->passive);
1973	#endif
1974	return ns;
1975	}
1976
1977	static const void *net_initial_ns(void)
1978	{
1979	return &init_net;
1980	}
1981
1982	static const void *net_netlink_ns(struct sock *sk)
1983	{
1984	return sock_net(sk);
1985	}
1986
1987	const struct kobj_ns_type_operations net_ns_type_operations = {
1988	.type = KOBJ_NS_TYPE_NET,
1989	.current_may_mount = net_current_may_mount,
1990	.grab_current_ns = net_grab_current_ns,
1991	.netlink_ns = net_netlink_ns,
1992	.initial_ns = net_initial_ns,
1993	.drop_ns = net_drop_ns,
1994	};
1995	EXPORT_SYMBOL_GPL(net_ns_type_operations);
1996
1997	static int netdev_uevent(const struct device *d, struct kobj_uevent_env *env)
1998	{
1999	const struct net_device *dev = to_net_dev(d);
2000	int retval;
2001
2002	/* pass interface to uevent. */
2003	retval = add_uevent_var(env, format: "INTERFACE=%s", dev->name);
2004	if (retval)
2005	goto exit;
2006
2007	/* pass ifindex to uevent.
2008	* ifindex is useful as it won't change (interface name may change)
2009	* and is what RtNetlink uses natively.
2010	*/
2011	retval = add_uevent_var(env, format: "IFINDEX=%d", dev->ifindex);
2012
2013	exit:
2014	return retval;
2015	}
2016
2017	/*
2018	* netdev_release -- destroy and free a dead device.
2019	* Called when last reference to device kobject is gone.
2020	*/
2021	static void netdev_release(struct device *d)
2022	{
2023	struct net_device *dev = to_net_dev(d);
2024
2025	BUG_ON(dev->reg_state != NETREG_RELEASED);
2026
2027	/* no need to wait for rcu grace period:
2028	* device is dead and about to be freed.
2029	*/
2030	kfree(rcu_access_pointer(dev->ifalias));
2031	netdev_freemem(dev);
2032	}
2033
2034	static const void *net_namespace(const struct device *d)
2035	{
2036	const struct net_device *dev = to_net_dev(d);
2037
2038	return dev_net(dev);
2039	}
2040
2041	static void net_get_ownership(const struct device *d, kuid_t *uid, kgid_t *gid)
2042	{
2043	const struct net_device *dev = to_net_dev(d);
2044	const struct net *net = dev_net(dev);
2045
2046	net_ns_get_ownership(net, uid, gid);
2047	}
2048
2049	static struct class net_class __ro_after_init = {
2050	.name = "net",
2051	.dev_release = netdev_release,
2052	.dev_groups = net_class_groups,
2053	.dev_uevent = netdev_uevent,
2054	.ns_type = &net_ns_type_operations,
2055	.namespace = net_namespace,
2056	.get_ownership = net_get_ownership,
2057	};
2058
2059	#ifdef CONFIG_OF
2060	static int of_dev_node_match(struct device *dev, const void *data)
2061	{
2062	for (; dev; dev = dev->parent) {
2063	if (dev->of_node == data)
2064	return 1;
2065	}
2066
2067	return 0;
2068	}
2069
2070	/*
2071	* of_find_net_device_by_node - lookup the net device for the device node
2072	* @np: OF device node
2073	*
2074	* Looks up the net_device structure corresponding with the device node.
2075	* If successful, returns a pointer to the net_device with the embedded
2076	* struct device refcount incremented by one, or NULL on failure. The
2077	* refcount must be dropped when done with the net_device.
2078	*/
2079	struct net_device *of_find_net_device_by_node(struct device_node *np)
2080	{
2081	struct device *dev;
2082
2083	dev = class_find_device(class: &net_class, NULL, data: np, match: of_dev_node_match);
2084	if (!dev)
2085	return NULL;
2086
2087	return to_net_dev(dev);
2088	}
2089	EXPORT_SYMBOL(of_find_net_device_by_node);
2090	#endif
2091
2092	/* Delete sysfs entries but hold kobject reference until after all
2093	* netdev references are gone.
2094	*/
2095	void netdev_unregister_kobject(struct net_device *ndev)
2096	{
2097	struct device *dev = &ndev->dev;
2098
2099	if (!refcount_read(r: &dev_net(dev: ndev)->ns.count))
2100	dev_set_uevent_suppress(dev, val: 1);
2101
2102	kobject_get(kobj: &dev->kobj);
2103
2104	remove_queue_kobjects(dev: ndev);
2105
2106	pm_runtime_set_memalloc_noio(dev, enable: false);
2107
2108	device_del(dev);
2109	}
2110
2111	/* Create sysfs entries for network device. */
2112	int netdev_register_kobject(struct net_device *ndev)
2113	{
2114	struct device *dev = &ndev->dev;
2115	const struct attribute_group **groups = ndev->sysfs_groups;
2116	int error = 0;
2117
2118	device_initialize(dev);
2119	dev->class = &net_class;
2120	dev->platform_data = ndev;
2121	dev->groups = groups;
2122
2123	dev_set_name(dev, name: "%s", ndev->name);
2124
2125	#ifdef CONFIG_SYSFS
2126	/* Allow for a device specific group */
2127	if (*groups)
2128	groups++;
2129
2130	*groups++ = &netstat_group;
2131
2132	if (wireless_group_needed(ndev))
2133	*groups++ = &wireless_group;
2134	#endif /* CONFIG_SYSFS */
2135
2136	error = device_add(dev);
2137	if (error)
2138	return error;
2139
2140	error = register_queue_kobjects(dev: ndev);
2141	if (error) {
2142	device_del(dev);
2143	return error;
2144	}
2145
2146	pm_runtime_set_memalloc_noio(dev, enable: true);
2147
2148	return error;
2149	}
2150
2151	/* Change owner for sysfs entries when moving network devices across network
2152	* namespaces owned by different user namespaces.
2153	*/
2154	int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
2155	const struct net *net_new)
2156	{
2157	kuid_t old_uid = GLOBAL_ROOT_UID, new_uid = GLOBAL_ROOT_UID;
2158	kgid_t old_gid = GLOBAL_ROOT_GID, new_gid = GLOBAL_ROOT_GID;
2159	struct device *dev = &ndev->dev;
2160	int error;
2161
2162	net_ns_get_ownership(net: net_old, uid: &old_uid, gid: &old_gid);
2163	net_ns_get_ownership(net: net_new, uid: &new_uid, gid: &new_gid);
2164
2165	/* The network namespace was changed but the owning user namespace is
2166	* identical so there's no need to change the owner of sysfs entries.
2167	*/
2168	if (uid_eq(left: old_uid, right: new_uid) && gid_eq(left: old_gid, right: new_gid))
2169	return 0;
2170
2171	error = device_change_owner(dev, kuid: new_uid, kgid: new_gid);
2172	if (error)
2173	return error;
2174
2175	error = queue_change_owner(ndev, kuid: new_uid, kgid: new_gid);
2176	if (error)
2177	return error;
2178
2179	return 0;
2180	}
2181
2182	int netdev_class_create_file_ns(const struct class_attribute *class_attr,
2183	const void *ns)
2184	{
2185	return class_create_file_ns(class: &net_class, attr: class_attr, ns);
2186	}
2187	EXPORT_SYMBOL(netdev_class_create_file_ns);
2188
2189	void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
2190	const void *ns)
2191	{
2192	class_remove_file_ns(class: &net_class, attr: class_attr, ns);
2193	}
2194	EXPORT_SYMBOL(netdev_class_remove_file_ns);
2195
2196	int __init netdev_kobject_init(void)
2197	{
2198	kobj_ns_type_register(ops: &net_ns_type_operations);
2199	return class_register(class: &net_class);
2200	}
2201