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