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