xref: /openbmc/linux/net/core/net-sysfs.c (revision 68198dca)
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/sched/signal.h>
19 #include <linux/nsproxy.h>
20 #include <net/sock.h>
21 #include <net/net_namespace.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/vmalloc.h>
24 #include <linux/export.h>
25 #include <linux/jiffies.h>
26 #include <linux/pm_runtime.h>
27 #include <linux/of.h>
28 #include <linux/of_net.h>
29 
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 static 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 */
44 static 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)				\
61 static ssize_t format_##field(const struct net_device *dev, char *buf)	\
62 {									\
63 	return sprintf(buf, format_string, dev->field);			\
64 }									\
65 static 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)				\
72 NETDEVICE_SHOW(field, format_string);					\
73 static DEVICE_ATTR_RO(field)
74 
75 #define NETDEVICE_SHOW_RW(field, format_string)				\
76 NETDEVICE_SHOW(field, format_string);					\
77 static DEVICE_ATTR_RW(field)
78 
79 /* use same locking and permission rules as SIF* ioctl's */
80 static 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 		ret = (*set)(netdev, new);
101 		if (ret == 0)
102 			ret = len;
103 	}
104 	rtnl_unlock();
105  err:
106 	return ret;
107 }
108 
109 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
110 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
111 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
112 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
113 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
114 NETDEVICE_SHOW_RO(type, fmt_dec);
115 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
116 
117 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
118 			   char *buf)
119 {
120 	struct net_device *ndev = to_net_dev(dev);
121 
122 	return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
123 }
124 static DEVICE_ATTR_RO(iflink);
125 
126 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
127 {
128 	return sprintf(buf, fmt_dec, dev->name_assign_type);
129 }
130 
131 static ssize_t name_assign_type_show(struct device *dev,
132 				     struct device_attribute *attr,
133 				     char *buf)
134 {
135 	struct net_device *ndev = to_net_dev(dev);
136 	ssize_t ret = -EINVAL;
137 
138 	if (ndev->name_assign_type != NET_NAME_UNKNOWN)
139 		ret = netdev_show(dev, attr, buf, format_name_assign_type);
140 
141 	return ret;
142 }
143 static DEVICE_ATTR_RO(name_assign_type);
144 
145 /* use same locking rules as GIFHWADDR ioctl's */
146 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
147 			    char *buf)
148 {
149 	struct net_device *ndev = to_net_dev(dev);
150 	ssize_t ret = -EINVAL;
151 
152 	read_lock(&dev_base_lock);
153 	if (dev_isalive(ndev))
154 		ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
155 	read_unlock(&dev_base_lock);
156 	return ret;
157 }
158 static DEVICE_ATTR_RO(address);
159 
160 static ssize_t broadcast_show(struct device *dev,
161 			      struct device_attribute *attr, char *buf)
162 {
163 	struct net_device *ndev = to_net_dev(dev);
164 
165 	if (dev_isalive(ndev))
166 		return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
167 	return -EINVAL;
168 }
169 static DEVICE_ATTR_RO(broadcast);
170 
171 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
172 {
173 	if (!netif_running(dev))
174 		return -EINVAL;
175 	return dev_change_carrier(dev, (bool)new_carrier);
176 }
177 
178 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
179 			     const char *buf, size_t len)
180 {
181 	return netdev_store(dev, attr, buf, len, change_carrier);
182 }
183 
184 static ssize_t carrier_show(struct device *dev,
185 			    struct device_attribute *attr, char *buf)
186 {
187 	struct net_device *netdev = to_net_dev(dev);
188 
189 	if (netif_running(netdev))
190 		return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
191 
192 	return -EINVAL;
193 }
194 static DEVICE_ATTR_RW(carrier);
195 
196 static ssize_t speed_show(struct device *dev,
197 			  struct device_attribute *attr, char *buf)
198 {
199 	struct net_device *netdev = to_net_dev(dev);
200 	int ret = -EINVAL;
201 
202 	if (!rtnl_trylock())
203 		return restart_syscall();
204 
205 	if (netif_running(netdev)) {
206 		struct ethtool_link_ksettings cmd;
207 
208 		if (!__ethtool_get_link_ksettings(netdev, &cmd))
209 			ret = sprintf(buf, fmt_dec, cmd.base.speed);
210 	}
211 	rtnl_unlock();
212 	return ret;
213 }
214 static DEVICE_ATTR_RO(speed);
215 
216 static ssize_t duplex_show(struct device *dev,
217 			   struct device_attribute *attr, char *buf)
218 {
219 	struct net_device *netdev = to_net_dev(dev);
220 	int ret = -EINVAL;
221 
222 	if (!rtnl_trylock())
223 		return restart_syscall();
224 
225 	if (netif_running(netdev)) {
226 		struct ethtool_link_ksettings cmd;
227 
228 		if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
229 			const char *duplex;
230 
231 			switch (cmd.base.duplex) {
232 			case DUPLEX_HALF:
233 				duplex = "half";
234 				break;
235 			case DUPLEX_FULL:
236 				duplex = "full";
237 				break;
238 			default:
239 				duplex = "unknown";
240 				break;
241 			}
242 			ret = sprintf(buf, "%s\n", duplex);
243 		}
244 	}
245 	rtnl_unlock();
246 	return ret;
247 }
248 static DEVICE_ATTR_RO(duplex);
249 
250 static ssize_t dormant_show(struct device *dev,
251 			    struct device_attribute *attr, char *buf)
252 {
253 	struct net_device *netdev = to_net_dev(dev);
254 
255 	if (netif_running(netdev))
256 		return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
257 
258 	return -EINVAL;
259 }
260 static DEVICE_ATTR_RO(dormant);
261 
262 static const char *const operstates[] = {
263 	"unknown",
264 	"notpresent", /* currently unused */
265 	"down",
266 	"lowerlayerdown",
267 	"testing", /* currently unused */
268 	"dormant",
269 	"up"
270 };
271 
272 static ssize_t operstate_show(struct device *dev,
273 			      struct device_attribute *attr, char *buf)
274 {
275 	const struct net_device *netdev = to_net_dev(dev);
276 	unsigned char operstate;
277 
278 	read_lock(&dev_base_lock);
279 	operstate = netdev->operstate;
280 	if (!netif_running(netdev))
281 		operstate = IF_OPER_DOWN;
282 	read_unlock(&dev_base_lock);
283 
284 	if (operstate >= ARRAY_SIZE(operstates))
285 		return -EINVAL; /* should not happen */
286 
287 	return sprintf(buf, "%s\n", operstates[operstate]);
288 }
289 static DEVICE_ATTR_RO(operstate);
290 
291 static ssize_t carrier_changes_show(struct device *dev,
292 				    struct device_attribute *attr,
293 				    char *buf)
294 {
295 	struct net_device *netdev = to_net_dev(dev);
296 
297 	return sprintf(buf, fmt_dec,
298 		       atomic_read(&netdev->carrier_changes));
299 }
300 static DEVICE_ATTR_RO(carrier_changes);
301 
302 /* read-write attributes */
303 
304 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
305 {
306 	return dev_set_mtu(dev, (int)new_mtu);
307 }
308 
309 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
310 			 const char *buf, size_t len)
311 {
312 	return netdev_store(dev, attr, buf, len, change_mtu);
313 }
314 NETDEVICE_SHOW_RW(mtu, fmt_dec);
315 
316 static int change_flags(struct net_device *dev, unsigned long new_flags)
317 {
318 	return dev_change_flags(dev, (unsigned int)new_flags);
319 }
320 
321 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
322 			   const char *buf, size_t len)
323 {
324 	return netdev_store(dev, attr, buf, len, change_flags);
325 }
326 NETDEVICE_SHOW_RW(flags, fmt_hex);
327 
328 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
329 {
330 	unsigned int orig_len = dev->tx_queue_len;
331 	int res;
332 
333 	if (new_len != (unsigned int)new_len)
334 		return -ERANGE;
335 
336 	if (new_len != orig_len) {
337 		dev->tx_queue_len = new_len;
338 		res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev);
339 		res = notifier_to_errno(res);
340 		if (res) {
341 			netdev_err(dev,
342 				   "refused to change device tx_queue_len\n");
343 			dev->tx_queue_len = orig_len;
344 			return -EFAULT;
345 		}
346 	}
347 
348 	return 0;
349 }
350 
351 static ssize_t tx_queue_len_store(struct device *dev,
352 				  struct device_attribute *attr,
353 				  const char *buf, size_t len)
354 {
355 	if (!capable(CAP_NET_ADMIN))
356 		return -EPERM;
357 
358 	return netdev_store(dev, attr, buf, len, change_tx_queue_len);
359 }
360 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
361 
362 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
363 {
364 	dev->gro_flush_timeout = val;
365 	return 0;
366 }
367 
368 static ssize_t gro_flush_timeout_store(struct device *dev,
369 				       struct device_attribute *attr,
370 				       const char *buf, size_t len)
371 {
372 	if (!capable(CAP_NET_ADMIN))
373 		return -EPERM;
374 
375 	return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
376 }
377 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
378 
379 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
380 			     const char *buf, size_t len)
381 {
382 	struct net_device *netdev = to_net_dev(dev);
383 	struct net *net = dev_net(netdev);
384 	size_t count = len;
385 	ssize_t ret = 0;
386 
387 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
388 		return -EPERM;
389 
390 	/* ignore trailing newline */
391 	if (len >  0 && buf[len - 1] == '\n')
392 		--count;
393 
394 	if (!rtnl_trylock())
395 		return restart_syscall();
396 
397 	if (dev_isalive(netdev)) {
398 		ret = dev_set_alias(netdev, buf, count);
399 		if (ret < 0)
400 			goto err;
401 		ret = len;
402 		netdev_state_change(netdev);
403 	}
404 err:
405 	rtnl_unlock();
406 
407 	return ret;
408 }
409 
410 static ssize_t ifalias_show(struct device *dev,
411 			    struct device_attribute *attr, char *buf)
412 {
413 	const struct net_device *netdev = to_net_dev(dev);
414 	char tmp[IFALIASZ];
415 	ssize_t ret = 0;
416 
417 	ret = dev_get_alias(netdev, tmp, sizeof(tmp));
418 	if (ret > 0)
419 		ret = sprintf(buf, "%s\n", tmp);
420 	return ret;
421 }
422 static DEVICE_ATTR_RW(ifalias);
423 
424 static int change_group(struct net_device *dev, unsigned long new_group)
425 {
426 	dev_set_group(dev, (int)new_group);
427 	return 0;
428 }
429 
430 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
431 			   const char *buf, size_t len)
432 {
433 	return netdev_store(dev, attr, buf, len, change_group);
434 }
435 NETDEVICE_SHOW(group, fmt_dec);
436 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
437 
438 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
439 {
440 	return dev_change_proto_down(dev, (bool)proto_down);
441 }
442 
443 static ssize_t proto_down_store(struct device *dev,
444 				struct device_attribute *attr,
445 				const char *buf, size_t len)
446 {
447 	return netdev_store(dev, attr, buf, len, change_proto_down);
448 }
449 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
450 
451 static ssize_t phys_port_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 = dev_get_phys_port_id(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 }
471 static DEVICE_ATTR_RO(phys_port_id);
472 
473 static ssize_t phys_port_name_show(struct device *dev,
474 				   struct device_attribute *attr, char *buf)
475 {
476 	struct net_device *netdev = to_net_dev(dev);
477 	ssize_t ret = -EINVAL;
478 
479 	if (!rtnl_trylock())
480 		return restart_syscall();
481 
482 	if (dev_isalive(netdev)) {
483 		char name[IFNAMSIZ];
484 
485 		ret = dev_get_phys_port_name(netdev, name, sizeof(name));
486 		if (!ret)
487 			ret = sprintf(buf, "%s\n", name);
488 	}
489 	rtnl_unlock();
490 
491 	return ret;
492 }
493 static DEVICE_ATTR_RO(phys_port_name);
494 
495 static ssize_t phys_switch_id_show(struct device *dev,
496 				   struct device_attribute *attr, char *buf)
497 {
498 	struct net_device *netdev = to_net_dev(dev);
499 	ssize_t ret = -EINVAL;
500 
501 	if (!rtnl_trylock())
502 		return restart_syscall();
503 
504 	if (dev_isalive(netdev)) {
505 		struct switchdev_attr attr = {
506 			.orig_dev = netdev,
507 			.id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
508 			.flags = SWITCHDEV_F_NO_RECURSE,
509 		};
510 
511 		ret = switchdev_port_attr_get(netdev, &attr);
512 		if (!ret)
513 			ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
514 				      attr.u.ppid.id);
515 	}
516 	rtnl_unlock();
517 
518 	return ret;
519 }
520 static DEVICE_ATTR_RO(phys_switch_id);
521 
522 static struct attribute *net_class_attrs[] __ro_after_init = {
523 	&dev_attr_netdev_group.attr,
524 	&dev_attr_type.attr,
525 	&dev_attr_dev_id.attr,
526 	&dev_attr_dev_port.attr,
527 	&dev_attr_iflink.attr,
528 	&dev_attr_ifindex.attr,
529 	&dev_attr_name_assign_type.attr,
530 	&dev_attr_addr_assign_type.attr,
531 	&dev_attr_addr_len.attr,
532 	&dev_attr_link_mode.attr,
533 	&dev_attr_address.attr,
534 	&dev_attr_broadcast.attr,
535 	&dev_attr_speed.attr,
536 	&dev_attr_duplex.attr,
537 	&dev_attr_dormant.attr,
538 	&dev_attr_operstate.attr,
539 	&dev_attr_carrier_changes.attr,
540 	&dev_attr_ifalias.attr,
541 	&dev_attr_carrier.attr,
542 	&dev_attr_mtu.attr,
543 	&dev_attr_flags.attr,
544 	&dev_attr_tx_queue_len.attr,
545 	&dev_attr_gro_flush_timeout.attr,
546 	&dev_attr_phys_port_id.attr,
547 	&dev_attr_phys_port_name.attr,
548 	&dev_attr_phys_switch_id.attr,
549 	&dev_attr_proto_down.attr,
550 	NULL,
551 };
552 ATTRIBUTE_GROUPS(net_class);
553 
554 /* Show a given an attribute in the statistics group */
555 static ssize_t netstat_show(const struct device *d,
556 			    struct device_attribute *attr, char *buf,
557 			    unsigned long offset)
558 {
559 	struct net_device *dev = to_net_dev(d);
560 	ssize_t ret = -EINVAL;
561 
562 	WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
563 		offset % sizeof(u64) != 0);
564 
565 	read_lock(&dev_base_lock);
566 	if (dev_isalive(dev)) {
567 		struct rtnl_link_stats64 temp;
568 		const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
569 
570 		ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
571 	}
572 	read_unlock(&dev_base_lock);
573 	return ret;
574 }
575 
576 /* generate a read-only statistics attribute */
577 #define NETSTAT_ENTRY(name)						\
578 static ssize_t name##_show(struct device *d,				\
579 			   struct device_attribute *attr, char *buf)	\
580 {									\
581 	return netstat_show(d, attr, buf,				\
582 			    offsetof(struct rtnl_link_stats64, name));	\
583 }									\
584 static DEVICE_ATTR_RO(name)
585 
586 NETSTAT_ENTRY(rx_packets);
587 NETSTAT_ENTRY(tx_packets);
588 NETSTAT_ENTRY(rx_bytes);
589 NETSTAT_ENTRY(tx_bytes);
590 NETSTAT_ENTRY(rx_errors);
591 NETSTAT_ENTRY(tx_errors);
592 NETSTAT_ENTRY(rx_dropped);
593 NETSTAT_ENTRY(tx_dropped);
594 NETSTAT_ENTRY(multicast);
595 NETSTAT_ENTRY(collisions);
596 NETSTAT_ENTRY(rx_length_errors);
597 NETSTAT_ENTRY(rx_over_errors);
598 NETSTAT_ENTRY(rx_crc_errors);
599 NETSTAT_ENTRY(rx_frame_errors);
600 NETSTAT_ENTRY(rx_fifo_errors);
601 NETSTAT_ENTRY(rx_missed_errors);
602 NETSTAT_ENTRY(tx_aborted_errors);
603 NETSTAT_ENTRY(tx_carrier_errors);
604 NETSTAT_ENTRY(tx_fifo_errors);
605 NETSTAT_ENTRY(tx_heartbeat_errors);
606 NETSTAT_ENTRY(tx_window_errors);
607 NETSTAT_ENTRY(rx_compressed);
608 NETSTAT_ENTRY(tx_compressed);
609 NETSTAT_ENTRY(rx_nohandler);
610 
611 static struct attribute *netstat_attrs[] __ro_after_init = {
612 	&dev_attr_rx_packets.attr,
613 	&dev_attr_tx_packets.attr,
614 	&dev_attr_rx_bytes.attr,
615 	&dev_attr_tx_bytes.attr,
616 	&dev_attr_rx_errors.attr,
617 	&dev_attr_tx_errors.attr,
618 	&dev_attr_rx_dropped.attr,
619 	&dev_attr_tx_dropped.attr,
620 	&dev_attr_multicast.attr,
621 	&dev_attr_collisions.attr,
622 	&dev_attr_rx_length_errors.attr,
623 	&dev_attr_rx_over_errors.attr,
624 	&dev_attr_rx_crc_errors.attr,
625 	&dev_attr_rx_frame_errors.attr,
626 	&dev_attr_rx_fifo_errors.attr,
627 	&dev_attr_rx_missed_errors.attr,
628 	&dev_attr_tx_aborted_errors.attr,
629 	&dev_attr_tx_carrier_errors.attr,
630 	&dev_attr_tx_fifo_errors.attr,
631 	&dev_attr_tx_heartbeat_errors.attr,
632 	&dev_attr_tx_window_errors.attr,
633 	&dev_attr_rx_compressed.attr,
634 	&dev_attr_tx_compressed.attr,
635 	&dev_attr_rx_nohandler.attr,
636 	NULL
637 };
638 
639 static const struct attribute_group netstat_group = {
640 	.name  = "statistics",
641 	.attrs  = netstat_attrs,
642 };
643 
644 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
645 static struct attribute *wireless_attrs[] = {
646 	NULL
647 };
648 
649 static const struct attribute_group wireless_group = {
650 	.name = "wireless",
651 	.attrs = wireless_attrs,
652 };
653 #endif
654 
655 #else /* CONFIG_SYSFS */
656 #define net_class_groups	NULL
657 #endif /* CONFIG_SYSFS */
658 
659 #ifdef CONFIG_SYSFS
660 #define to_rx_queue_attr(_attr) \
661 	container_of(_attr, struct rx_queue_attribute, attr)
662 
663 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
664 
665 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
666 				  char *buf)
667 {
668 	const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
669 	struct netdev_rx_queue *queue = to_rx_queue(kobj);
670 
671 	if (!attribute->show)
672 		return -EIO;
673 
674 	return attribute->show(queue, buf);
675 }
676 
677 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
678 				   const char *buf, size_t count)
679 {
680 	const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
681 	struct netdev_rx_queue *queue = to_rx_queue(kobj);
682 
683 	if (!attribute->store)
684 		return -EIO;
685 
686 	return attribute->store(queue, buf, count);
687 }
688 
689 static const struct sysfs_ops rx_queue_sysfs_ops = {
690 	.show = rx_queue_attr_show,
691 	.store = rx_queue_attr_store,
692 };
693 
694 #ifdef CONFIG_RPS
695 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
696 {
697 	struct rps_map *map;
698 	cpumask_var_t mask;
699 	int i, len;
700 
701 	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
702 		return -ENOMEM;
703 
704 	rcu_read_lock();
705 	map = rcu_dereference(queue->rps_map);
706 	if (map)
707 		for (i = 0; i < map->len; i++)
708 			cpumask_set_cpu(map->cpus[i], mask);
709 
710 	len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
711 	rcu_read_unlock();
712 	free_cpumask_var(mask);
713 
714 	return len < PAGE_SIZE ? len : -EINVAL;
715 }
716 
717 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
718 			     const char *buf, size_t len)
719 {
720 	struct rps_map *old_map, *map;
721 	cpumask_var_t mask;
722 	int err, cpu, i;
723 	static DEFINE_MUTEX(rps_map_mutex);
724 
725 	if (!capable(CAP_NET_ADMIN))
726 		return -EPERM;
727 
728 	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
729 		return -ENOMEM;
730 
731 	err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
732 	if (err) {
733 		free_cpumask_var(mask);
734 		return err;
735 	}
736 
737 	map = kzalloc(max_t(unsigned int,
738 			    RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
739 		      GFP_KERNEL);
740 	if (!map) {
741 		free_cpumask_var(mask);
742 		return -ENOMEM;
743 	}
744 
745 	i = 0;
746 	for_each_cpu_and(cpu, mask, cpu_online_mask)
747 		map->cpus[i++] = cpu;
748 
749 	if (i) {
750 		map->len = i;
751 	} else {
752 		kfree(map);
753 		map = NULL;
754 	}
755 
756 	mutex_lock(&rps_map_mutex);
757 	old_map = rcu_dereference_protected(queue->rps_map,
758 					    mutex_is_locked(&rps_map_mutex));
759 	rcu_assign_pointer(queue->rps_map, map);
760 
761 	if (map)
762 		static_key_slow_inc(&rps_needed);
763 	if (old_map)
764 		static_key_slow_dec(&rps_needed);
765 
766 	mutex_unlock(&rps_map_mutex);
767 
768 	if (old_map)
769 		kfree_rcu(old_map, rcu);
770 
771 	free_cpumask_var(mask);
772 	return len;
773 }
774 
775 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
776 					   char *buf)
777 {
778 	struct rps_dev_flow_table *flow_table;
779 	unsigned long val = 0;
780 
781 	rcu_read_lock();
782 	flow_table = rcu_dereference(queue->rps_flow_table);
783 	if (flow_table)
784 		val = (unsigned long)flow_table->mask + 1;
785 	rcu_read_unlock();
786 
787 	return sprintf(buf, "%lu\n", val);
788 }
789 
790 static void rps_dev_flow_table_release(struct rcu_head *rcu)
791 {
792 	struct rps_dev_flow_table *table = container_of(rcu,
793 	    struct rps_dev_flow_table, rcu);
794 	vfree(table);
795 }
796 
797 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
798 					    const char *buf, size_t len)
799 {
800 	unsigned long mask, count;
801 	struct rps_dev_flow_table *table, *old_table;
802 	static DEFINE_SPINLOCK(rps_dev_flow_lock);
803 	int rc;
804 
805 	if (!capable(CAP_NET_ADMIN))
806 		return -EPERM;
807 
808 	rc = kstrtoul(buf, 0, &count);
809 	if (rc < 0)
810 		return rc;
811 
812 	if (count) {
813 		mask = count - 1;
814 		/* mask = roundup_pow_of_two(count) - 1;
815 		 * without overflows...
816 		 */
817 		while ((mask | (mask >> 1)) != mask)
818 			mask |= (mask >> 1);
819 		/* On 64 bit arches, must check mask fits in table->mask (u32),
820 		 * and on 32bit arches, must check
821 		 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
822 		 */
823 #if BITS_PER_LONG > 32
824 		if (mask > (unsigned long)(u32)mask)
825 			return -EINVAL;
826 #else
827 		if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
828 				/ sizeof(struct rps_dev_flow)) {
829 			/* Enforce a limit to prevent overflow */
830 			return -EINVAL;
831 		}
832 #endif
833 		table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
834 		if (!table)
835 			return -ENOMEM;
836 
837 		table->mask = mask;
838 		for (count = 0; count <= mask; count++)
839 			table->flows[count].cpu = RPS_NO_CPU;
840 	} else {
841 		table = NULL;
842 	}
843 
844 	spin_lock(&rps_dev_flow_lock);
845 	old_table = rcu_dereference_protected(queue->rps_flow_table,
846 					      lockdep_is_held(&rps_dev_flow_lock));
847 	rcu_assign_pointer(queue->rps_flow_table, table);
848 	spin_unlock(&rps_dev_flow_lock);
849 
850 	if (old_table)
851 		call_rcu(&old_table->rcu, rps_dev_flow_table_release);
852 
853 	return len;
854 }
855 
856 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
857 	= __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
858 
859 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
860 	= __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
861 		 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
862 #endif /* CONFIG_RPS */
863 
864 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
865 #ifdef CONFIG_RPS
866 	&rps_cpus_attribute.attr,
867 	&rps_dev_flow_table_cnt_attribute.attr,
868 #endif
869 	NULL
870 };
871 
872 static void rx_queue_release(struct kobject *kobj)
873 {
874 	struct netdev_rx_queue *queue = to_rx_queue(kobj);
875 #ifdef CONFIG_RPS
876 	struct rps_map *map;
877 	struct rps_dev_flow_table *flow_table;
878 
879 	map = rcu_dereference_protected(queue->rps_map, 1);
880 	if (map) {
881 		RCU_INIT_POINTER(queue->rps_map, NULL);
882 		kfree_rcu(map, rcu);
883 	}
884 
885 	flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
886 	if (flow_table) {
887 		RCU_INIT_POINTER(queue->rps_flow_table, NULL);
888 		call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
889 	}
890 #endif
891 
892 	memset(kobj, 0, sizeof(*kobj));
893 	dev_put(queue->dev);
894 }
895 
896 static const void *rx_queue_namespace(struct kobject *kobj)
897 {
898 	struct netdev_rx_queue *queue = to_rx_queue(kobj);
899 	struct device *dev = &queue->dev->dev;
900 	const void *ns = NULL;
901 
902 	if (dev->class && dev->class->ns_type)
903 		ns = dev->class->namespace(dev);
904 
905 	return ns;
906 }
907 
908 static struct kobj_type rx_queue_ktype __ro_after_init = {
909 	.sysfs_ops = &rx_queue_sysfs_ops,
910 	.release = rx_queue_release,
911 	.default_attrs = rx_queue_default_attrs,
912 	.namespace = rx_queue_namespace
913 };
914 
915 static int rx_queue_add_kobject(struct net_device *dev, int index)
916 {
917 	struct netdev_rx_queue *queue = dev->_rx + index;
918 	struct kobject *kobj = &queue->kobj;
919 	int error = 0;
920 
921 	kobj->kset = dev->queues_kset;
922 	error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
923 				     "rx-%u", index);
924 	if (error)
925 		return error;
926 
927 	if (dev->sysfs_rx_queue_group) {
928 		error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
929 		if (error) {
930 			kobject_put(kobj);
931 			return error;
932 		}
933 	}
934 
935 	kobject_uevent(kobj, KOBJ_ADD);
936 	dev_hold(queue->dev);
937 
938 	return error;
939 }
940 #endif /* CONFIG_SYSFS */
941 
942 int
943 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
944 {
945 #ifdef CONFIG_SYSFS
946 	int i;
947 	int error = 0;
948 
949 #ifndef CONFIG_RPS
950 	if (!dev->sysfs_rx_queue_group)
951 		return 0;
952 #endif
953 	for (i = old_num; i < new_num; i++) {
954 		error = rx_queue_add_kobject(dev, i);
955 		if (error) {
956 			new_num = old_num;
957 			break;
958 		}
959 	}
960 
961 	while (--i >= new_num) {
962 		struct kobject *kobj = &dev->_rx[i].kobj;
963 
964 		if (!atomic_read(&dev_net(dev)->count))
965 			kobj->uevent_suppress = 1;
966 		if (dev->sysfs_rx_queue_group)
967 			sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
968 		kobject_put(kobj);
969 	}
970 
971 	return error;
972 #else
973 	return 0;
974 #endif
975 }
976 
977 #ifdef CONFIG_SYSFS
978 /*
979  * netdev_queue sysfs structures and functions.
980  */
981 struct netdev_queue_attribute {
982 	struct attribute attr;
983 	ssize_t (*show)(struct netdev_queue *queue, char *buf);
984 	ssize_t (*store)(struct netdev_queue *queue,
985 			 const char *buf, size_t len);
986 };
987 #define to_netdev_queue_attr(_attr) \
988 	container_of(_attr, struct netdev_queue_attribute, attr)
989 
990 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
991 
992 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
993 				      struct attribute *attr, char *buf)
994 {
995 	const struct netdev_queue_attribute *attribute
996 		= to_netdev_queue_attr(attr);
997 	struct netdev_queue *queue = to_netdev_queue(kobj);
998 
999 	if (!attribute->show)
1000 		return -EIO;
1001 
1002 	return attribute->show(queue, buf);
1003 }
1004 
1005 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1006 				       struct attribute *attr,
1007 				       const char *buf, size_t count)
1008 {
1009 	const struct netdev_queue_attribute *attribute
1010 		= to_netdev_queue_attr(attr);
1011 	struct netdev_queue *queue = to_netdev_queue(kobj);
1012 
1013 	if (!attribute->store)
1014 		return -EIO;
1015 
1016 	return attribute->store(queue, buf, count);
1017 }
1018 
1019 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1020 	.show = netdev_queue_attr_show,
1021 	.store = netdev_queue_attr_store,
1022 };
1023 
1024 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1025 {
1026 	unsigned long trans_timeout;
1027 
1028 	spin_lock_irq(&queue->_xmit_lock);
1029 	trans_timeout = queue->trans_timeout;
1030 	spin_unlock_irq(&queue->_xmit_lock);
1031 
1032 	return sprintf(buf, "%lu", trans_timeout);
1033 }
1034 
1035 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1036 {
1037 	struct net_device *dev = queue->dev;
1038 	unsigned int i;
1039 
1040 	i = queue - dev->_tx;
1041 	BUG_ON(i >= dev->num_tx_queues);
1042 
1043 	return i;
1044 }
1045 
1046 static ssize_t traffic_class_show(struct netdev_queue *queue,
1047 				  char *buf)
1048 {
1049 	struct net_device *dev = queue->dev;
1050 	int index = get_netdev_queue_index(queue);
1051 	int tc = netdev_txq_to_tc(dev, index);
1052 
1053 	if (tc < 0)
1054 		return -EINVAL;
1055 
1056 	return sprintf(buf, "%u\n", tc);
1057 }
1058 
1059 #ifdef CONFIG_XPS
1060 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1061 			       char *buf)
1062 {
1063 	return sprintf(buf, "%lu\n", queue->tx_maxrate);
1064 }
1065 
1066 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1067 				const char *buf, size_t len)
1068 {
1069 	struct net_device *dev = queue->dev;
1070 	int err, index = get_netdev_queue_index(queue);
1071 	u32 rate = 0;
1072 
1073 	err = kstrtou32(buf, 10, &rate);
1074 	if (err < 0)
1075 		return err;
1076 
1077 	if (!rtnl_trylock())
1078 		return restart_syscall();
1079 
1080 	err = -EOPNOTSUPP;
1081 	if (dev->netdev_ops->ndo_set_tx_maxrate)
1082 		err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1083 
1084 	rtnl_unlock();
1085 	if (!err) {
1086 		queue->tx_maxrate = rate;
1087 		return len;
1088 	}
1089 	return err;
1090 }
1091 
1092 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1093 	= __ATTR_RW(tx_maxrate);
1094 #endif
1095 
1096 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1097 	= __ATTR_RO(tx_timeout);
1098 
1099 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1100 	= __ATTR_RO(traffic_class);
1101 
1102 #ifdef CONFIG_BQL
1103 /*
1104  * Byte queue limits sysfs structures and functions.
1105  */
1106 static ssize_t bql_show(char *buf, unsigned int value)
1107 {
1108 	return sprintf(buf, "%u\n", value);
1109 }
1110 
1111 static ssize_t bql_set(const char *buf, const size_t count,
1112 		       unsigned int *pvalue)
1113 {
1114 	unsigned int value;
1115 	int err;
1116 
1117 	if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1118 		value = DQL_MAX_LIMIT;
1119 	} else {
1120 		err = kstrtouint(buf, 10, &value);
1121 		if (err < 0)
1122 			return err;
1123 		if (value > DQL_MAX_LIMIT)
1124 			return -EINVAL;
1125 	}
1126 
1127 	*pvalue = value;
1128 
1129 	return count;
1130 }
1131 
1132 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1133 				  char *buf)
1134 {
1135 	struct dql *dql = &queue->dql;
1136 
1137 	return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1138 }
1139 
1140 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1141 				 const char *buf, size_t len)
1142 {
1143 	struct dql *dql = &queue->dql;
1144 	unsigned int value;
1145 	int err;
1146 
1147 	err = kstrtouint(buf, 10, &value);
1148 	if (err < 0)
1149 		return err;
1150 
1151 	dql->slack_hold_time = msecs_to_jiffies(value);
1152 
1153 	return len;
1154 }
1155 
1156 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1157 	= __ATTR(hold_time, S_IRUGO | S_IWUSR,
1158 		 bql_show_hold_time, bql_set_hold_time);
1159 
1160 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1161 				 char *buf)
1162 {
1163 	struct dql *dql = &queue->dql;
1164 
1165 	return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1166 }
1167 
1168 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1169 	__ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1170 
1171 #define BQL_ATTR(NAME, FIELD)						\
1172 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,		\
1173 				 char *buf)				\
1174 {									\
1175 	return bql_show(buf, queue->dql.FIELD);				\
1176 }									\
1177 									\
1178 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,		\
1179 				const char *buf, size_t len)		\
1180 {									\
1181 	return bql_set(buf, len, &queue->dql.FIELD);			\
1182 }									\
1183 									\
1184 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1185 	= __ATTR(NAME, S_IRUGO | S_IWUSR,				\
1186 		 bql_show_ ## NAME, bql_set_ ## NAME)
1187 
1188 BQL_ATTR(limit, limit);
1189 BQL_ATTR(limit_max, max_limit);
1190 BQL_ATTR(limit_min, min_limit);
1191 
1192 static struct attribute *dql_attrs[] __ro_after_init = {
1193 	&bql_limit_attribute.attr,
1194 	&bql_limit_max_attribute.attr,
1195 	&bql_limit_min_attribute.attr,
1196 	&bql_hold_time_attribute.attr,
1197 	&bql_inflight_attribute.attr,
1198 	NULL
1199 };
1200 
1201 static const struct attribute_group dql_group = {
1202 	.name  = "byte_queue_limits",
1203 	.attrs  = dql_attrs,
1204 };
1205 #endif /* CONFIG_BQL */
1206 
1207 #ifdef CONFIG_XPS
1208 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1209 			     char *buf)
1210 {
1211 	struct net_device *dev = queue->dev;
1212 	int cpu, len, num_tc = 1, tc = 0;
1213 	struct xps_dev_maps *dev_maps;
1214 	cpumask_var_t mask;
1215 	unsigned long index;
1216 
1217 	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1218 		return -ENOMEM;
1219 
1220 	index = get_netdev_queue_index(queue);
1221 
1222 	if (dev->num_tc) {
1223 		num_tc = dev->num_tc;
1224 		tc = netdev_txq_to_tc(dev, index);
1225 		if (tc < 0)
1226 			return -EINVAL;
1227 	}
1228 
1229 	rcu_read_lock();
1230 	dev_maps = rcu_dereference(dev->xps_maps);
1231 	if (dev_maps) {
1232 		for_each_possible_cpu(cpu) {
1233 			int i, tci = cpu * num_tc + tc;
1234 			struct xps_map *map;
1235 
1236 			map = rcu_dereference(dev_maps->cpu_map[tci]);
1237 			if (!map)
1238 				continue;
1239 
1240 			for (i = map->len; i--;) {
1241 				if (map->queues[i] == index) {
1242 					cpumask_set_cpu(cpu, mask);
1243 					break;
1244 				}
1245 			}
1246 		}
1247 	}
1248 	rcu_read_unlock();
1249 
1250 	len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1251 	free_cpumask_var(mask);
1252 	return len < PAGE_SIZE ? len : -EINVAL;
1253 }
1254 
1255 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1256 			      const char *buf, size_t len)
1257 {
1258 	struct net_device *dev = queue->dev;
1259 	unsigned long index;
1260 	cpumask_var_t mask;
1261 	int err;
1262 
1263 	if (!capable(CAP_NET_ADMIN))
1264 		return -EPERM;
1265 
1266 	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1267 		return -ENOMEM;
1268 
1269 	index = get_netdev_queue_index(queue);
1270 
1271 	err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1272 	if (err) {
1273 		free_cpumask_var(mask);
1274 		return err;
1275 	}
1276 
1277 	err = netif_set_xps_queue(dev, mask, index);
1278 
1279 	free_cpumask_var(mask);
1280 
1281 	return err ? : len;
1282 }
1283 
1284 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1285 	= __ATTR_RW(xps_cpus);
1286 #endif /* CONFIG_XPS */
1287 
1288 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1289 	&queue_trans_timeout.attr,
1290 	&queue_traffic_class.attr,
1291 #ifdef CONFIG_XPS
1292 	&xps_cpus_attribute.attr,
1293 	&queue_tx_maxrate.attr,
1294 #endif
1295 	NULL
1296 };
1297 
1298 static void netdev_queue_release(struct kobject *kobj)
1299 {
1300 	struct netdev_queue *queue = to_netdev_queue(kobj);
1301 
1302 	memset(kobj, 0, sizeof(*kobj));
1303 	dev_put(queue->dev);
1304 }
1305 
1306 static const void *netdev_queue_namespace(struct kobject *kobj)
1307 {
1308 	struct netdev_queue *queue = to_netdev_queue(kobj);
1309 	struct device *dev = &queue->dev->dev;
1310 	const void *ns = NULL;
1311 
1312 	if (dev->class && dev->class->ns_type)
1313 		ns = dev->class->namespace(dev);
1314 
1315 	return ns;
1316 }
1317 
1318 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1319 	.sysfs_ops = &netdev_queue_sysfs_ops,
1320 	.release = netdev_queue_release,
1321 	.default_attrs = netdev_queue_default_attrs,
1322 	.namespace = netdev_queue_namespace,
1323 };
1324 
1325 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1326 {
1327 	struct netdev_queue *queue = dev->_tx + index;
1328 	struct kobject *kobj = &queue->kobj;
1329 	int error = 0;
1330 
1331 	kobj->kset = dev->queues_kset;
1332 	error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1333 				     "tx-%u", index);
1334 	if (error)
1335 		return error;
1336 
1337 #ifdef CONFIG_BQL
1338 	error = sysfs_create_group(kobj, &dql_group);
1339 	if (error) {
1340 		kobject_put(kobj);
1341 		return error;
1342 	}
1343 #endif
1344 
1345 	kobject_uevent(kobj, KOBJ_ADD);
1346 	dev_hold(queue->dev);
1347 
1348 	return 0;
1349 }
1350 #endif /* CONFIG_SYSFS */
1351 
1352 int
1353 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1354 {
1355 #ifdef CONFIG_SYSFS
1356 	int i;
1357 	int error = 0;
1358 
1359 	for (i = old_num; i < new_num; i++) {
1360 		error = netdev_queue_add_kobject(dev, i);
1361 		if (error) {
1362 			new_num = old_num;
1363 			break;
1364 		}
1365 	}
1366 
1367 	while (--i >= new_num) {
1368 		struct netdev_queue *queue = dev->_tx + i;
1369 
1370 		if (!atomic_read(&dev_net(dev)->count))
1371 			queue->kobj.uevent_suppress = 1;
1372 #ifdef CONFIG_BQL
1373 		sysfs_remove_group(&queue->kobj, &dql_group);
1374 #endif
1375 		kobject_put(&queue->kobj);
1376 	}
1377 
1378 	return error;
1379 #else
1380 	return 0;
1381 #endif /* CONFIG_SYSFS */
1382 }
1383 
1384 static int register_queue_kobjects(struct net_device *dev)
1385 {
1386 	int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1387 
1388 #ifdef CONFIG_SYSFS
1389 	dev->queues_kset = kset_create_and_add("queues",
1390 					       NULL, &dev->dev.kobj);
1391 	if (!dev->queues_kset)
1392 		return -ENOMEM;
1393 	real_rx = dev->real_num_rx_queues;
1394 #endif
1395 	real_tx = dev->real_num_tx_queues;
1396 
1397 	error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1398 	if (error)
1399 		goto error;
1400 	rxq = real_rx;
1401 
1402 	error = netdev_queue_update_kobjects(dev, 0, real_tx);
1403 	if (error)
1404 		goto error;
1405 	txq = real_tx;
1406 
1407 	return 0;
1408 
1409 error:
1410 	netdev_queue_update_kobjects(dev, txq, 0);
1411 	net_rx_queue_update_kobjects(dev, rxq, 0);
1412 	return error;
1413 }
1414 
1415 static void remove_queue_kobjects(struct net_device *dev)
1416 {
1417 	int real_rx = 0, real_tx = 0;
1418 
1419 #ifdef CONFIG_SYSFS
1420 	real_rx = dev->real_num_rx_queues;
1421 #endif
1422 	real_tx = dev->real_num_tx_queues;
1423 
1424 	net_rx_queue_update_kobjects(dev, real_rx, 0);
1425 	netdev_queue_update_kobjects(dev, real_tx, 0);
1426 #ifdef CONFIG_SYSFS
1427 	kset_unregister(dev->queues_kset);
1428 #endif
1429 }
1430 
1431 static bool net_current_may_mount(void)
1432 {
1433 	struct net *net = current->nsproxy->net_ns;
1434 
1435 	return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1436 }
1437 
1438 static void *net_grab_current_ns(void)
1439 {
1440 	struct net *ns = current->nsproxy->net_ns;
1441 #ifdef CONFIG_NET_NS
1442 	if (ns)
1443 		refcount_inc(&ns->passive);
1444 #endif
1445 	return ns;
1446 }
1447 
1448 static const void *net_initial_ns(void)
1449 {
1450 	return &init_net;
1451 }
1452 
1453 static const void *net_netlink_ns(struct sock *sk)
1454 {
1455 	return sock_net(sk);
1456 }
1457 
1458 const struct kobj_ns_type_operations net_ns_type_operations = {
1459 	.type = KOBJ_NS_TYPE_NET,
1460 	.current_may_mount = net_current_may_mount,
1461 	.grab_current_ns = net_grab_current_ns,
1462 	.netlink_ns = net_netlink_ns,
1463 	.initial_ns = net_initial_ns,
1464 	.drop_ns = net_drop_ns,
1465 };
1466 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1467 
1468 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1469 {
1470 	struct net_device *dev = to_net_dev(d);
1471 	int retval;
1472 
1473 	/* pass interface to uevent. */
1474 	retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1475 	if (retval)
1476 		goto exit;
1477 
1478 	/* pass ifindex to uevent.
1479 	 * ifindex is useful as it won't change (interface name may change)
1480 	 * and is what RtNetlink uses natively.
1481 	 */
1482 	retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1483 
1484 exit:
1485 	return retval;
1486 }
1487 
1488 /*
1489  *	netdev_release -- destroy and free a dead device.
1490  *	Called when last reference to device kobject is gone.
1491  */
1492 static void netdev_release(struct device *d)
1493 {
1494 	struct net_device *dev = to_net_dev(d);
1495 
1496 	BUG_ON(dev->reg_state != NETREG_RELEASED);
1497 
1498 	/* no need to wait for rcu grace period:
1499 	 * device is dead and about to be freed.
1500 	 */
1501 	kfree(rcu_access_pointer(dev->ifalias));
1502 	netdev_freemem(dev);
1503 }
1504 
1505 static const void *net_namespace(struct device *d)
1506 {
1507 	struct net_device *dev = to_net_dev(d);
1508 
1509 	return dev_net(dev);
1510 }
1511 
1512 static struct class net_class __ro_after_init = {
1513 	.name = "net",
1514 	.dev_release = netdev_release,
1515 	.dev_groups = net_class_groups,
1516 	.dev_uevent = netdev_uevent,
1517 	.ns_type = &net_ns_type_operations,
1518 	.namespace = net_namespace,
1519 };
1520 
1521 #ifdef CONFIG_OF_NET
1522 static int of_dev_node_match(struct device *dev, const void *data)
1523 {
1524 	int ret = 0;
1525 
1526 	if (dev->parent)
1527 		ret = dev->parent->of_node == data;
1528 
1529 	return ret == 0 ? dev->of_node == data : ret;
1530 }
1531 
1532 /*
1533  * of_find_net_device_by_node - lookup the net device for the device node
1534  * @np: OF device node
1535  *
1536  * Looks up the net_device structure corresponding with the device node.
1537  * If successful, returns a pointer to the net_device with the embedded
1538  * struct device refcount incremented by one, or NULL on failure. The
1539  * refcount must be dropped when done with the net_device.
1540  */
1541 struct net_device *of_find_net_device_by_node(struct device_node *np)
1542 {
1543 	struct device *dev;
1544 
1545 	dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1546 	if (!dev)
1547 		return NULL;
1548 
1549 	return to_net_dev(dev);
1550 }
1551 EXPORT_SYMBOL(of_find_net_device_by_node);
1552 #endif
1553 
1554 /* Delete sysfs entries but hold kobject reference until after all
1555  * netdev references are gone.
1556  */
1557 void netdev_unregister_kobject(struct net_device *ndev)
1558 {
1559 	struct device *dev = &ndev->dev;
1560 
1561 	if (!atomic_read(&dev_net(ndev)->count))
1562 		dev_set_uevent_suppress(dev, 1);
1563 
1564 	kobject_get(&dev->kobj);
1565 
1566 	remove_queue_kobjects(ndev);
1567 
1568 	pm_runtime_set_memalloc_noio(dev, false);
1569 
1570 	device_del(dev);
1571 }
1572 
1573 /* Create sysfs entries for network device. */
1574 int netdev_register_kobject(struct net_device *ndev)
1575 {
1576 	struct device *dev = &ndev->dev;
1577 	const struct attribute_group **groups = ndev->sysfs_groups;
1578 	int error = 0;
1579 
1580 	device_initialize(dev);
1581 	dev->class = &net_class;
1582 	dev->platform_data = ndev;
1583 	dev->groups = groups;
1584 
1585 	dev_set_name(dev, "%s", ndev->name);
1586 
1587 #ifdef CONFIG_SYSFS
1588 	/* Allow for a device specific group */
1589 	if (*groups)
1590 		groups++;
1591 
1592 	*groups++ = &netstat_group;
1593 
1594 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1595 	if (ndev->ieee80211_ptr)
1596 		*groups++ = &wireless_group;
1597 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1598 	else if (ndev->wireless_handlers)
1599 		*groups++ = &wireless_group;
1600 #endif
1601 #endif
1602 #endif /* CONFIG_SYSFS */
1603 
1604 	error = device_add(dev);
1605 	if (error)
1606 		return error;
1607 
1608 	error = register_queue_kobjects(ndev);
1609 	if (error) {
1610 		device_del(dev);
1611 		return error;
1612 	}
1613 
1614 	pm_runtime_set_memalloc_noio(dev, true);
1615 
1616 	return error;
1617 }
1618 
1619 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1620 				const void *ns)
1621 {
1622 	return class_create_file_ns(&net_class, class_attr, ns);
1623 }
1624 EXPORT_SYMBOL(netdev_class_create_file_ns);
1625 
1626 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1627 				 const void *ns)
1628 {
1629 	class_remove_file_ns(&net_class, class_attr, ns);
1630 }
1631 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1632 
1633 int __init netdev_kobject_init(void)
1634 {
1635 	kobj_ns_type_register(&net_ns_type_operations);
1636 	return class_register(&net_class);
1637 }
1638