xref: /openbmc/linux/net/core/net-sysfs.c (revision 15e3ae36)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * net-sysfs.c - network device class and attributes
4  *
5  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
6  */
7 
8 #include <linux/capability.h>
9 #include <linux/kernel.h>
10 #include <linux/netdevice.h>
11 #include <linux/if_arp.h>
12 #include <linux/slab.h>
13 #include <linux/sched/signal.h>
14 #include <linux/nsproxy.h>
15 #include <net/sock.h>
16 #include <net/net_namespace.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/vmalloc.h>
19 #include <linux/export.h>
20 #include <linux/jiffies.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/of.h>
23 #include <linux/of_net.h>
24 #include <linux/cpu.h>
25 
26 #include "net-sysfs.h"
27 
28 #ifdef CONFIG_SYSFS
29 static const char fmt_hex[] = "%#x\n";
30 static const char fmt_dec[] = "%d\n";
31 static const char fmt_ulong[] = "%lu\n";
32 static const char fmt_u64[] = "%llu\n";
33 
34 static inline int dev_isalive(const struct net_device *dev)
35 {
36 	return dev->reg_state <= NETREG_REGISTERED;
37 }
38 
39 /* use same locking rules as GIF* ioctl's */
40 static ssize_t netdev_show(const struct device *dev,
41 			   struct device_attribute *attr, char *buf,
42 			   ssize_t (*format)(const struct net_device *, char *))
43 {
44 	struct net_device *ndev = to_net_dev(dev);
45 	ssize_t ret = -EINVAL;
46 
47 	read_lock(&dev_base_lock);
48 	if (dev_isalive(ndev))
49 		ret = (*format)(ndev, buf);
50 	read_unlock(&dev_base_lock);
51 
52 	return ret;
53 }
54 
55 /* generate a show function for simple field */
56 #define NETDEVICE_SHOW(field, format_string)				\
57 static ssize_t format_##field(const struct net_device *dev, char *buf)	\
58 {									\
59 	return sprintf(buf, format_string, dev->field);			\
60 }									\
61 static ssize_t field##_show(struct device *dev,				\
62 			    struct device_attribute *attr, char *buf)	\
63 {									\
64 	return netdev_show(dev, attr, buf, format_##field);		\
65 }									\
66 
67 #define NETDEVICE_SHOW_RO(field, format_string)				\
68 NETDEVICE_SHOW(field, format_string);					\
69 static DEVICE_ATTR_RO(field)
70 
71 #define NETDEVICE_SHOW_RW(field, format_string)				\
72 NETDEVICE_SHOW(field, format_string);					\
73 static DEVICE_ATTR_RW(field)
74 
75 /* use same locking and permission rules as SIF* ioctl's */
76 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
77 			    const char *buf, size_t len,
78 			    int (*set)(struct net_device *, unsigned long))
79 {
80 	struct net_device *netdev = to_net_dev(dev);
81 	struct net *net = dev_net(netdev);
82 	unsigned long new;
83 	int ret = -EINVAL;
84 
85 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
86 		return -EPERM;
87 
88 	ret = kstrtoul(buf, 0, &new);
89 	if (ret)
90 		goto err;
91 
92 	if (!rtnl_trylock())
93 		return restart_syscall();
94 
95 	if (dev_isalive(netdev)) {
96 		ret = (*set)(netdev, new);
97 		if (ret == 0)
98 			ret = len;
99 	}
100 	rtnl_unlock();
101  err:
102 	return ret;
103 }
104 
105 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
106 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
107 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
108 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
109 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
110 NETDEVICE_SHOW_RO(type, fmt_dec);
111 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
112 
113 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
114 			   char *buf)
115 {
116 	struct net_device *ndev = to_net_dev(dev);
117 
118 	return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
119 }
120 static DEVICE_ATTR_RO(iflink);
121 
122 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
123 {
124 	return sprintf(buf, fmt_dec, dev->name_assign_type);
125 }
126 
127 static ssize_t name_assign_type_show(struct device *dev,
128 				     struct device_attribute *attr,
129 				     char *buf)
130 {
131 	struct net_device *ndev = to_net_dev(dev);
132 	ssize_t ret = -EINVAL;
133 
134 	if (ndev->name_assign_type != NET_NAME_UNKNOWN)
135 		ret = netdev_show(dev, attr, buf, format_name_assign_type);
136 
137 	return ret;
138 }
139 static DEVICE_ATTR_RO(name_assign_type);
140 
141 /* use same locking rules as GIFHWADDR ioctl's */
142 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
143 			    char *buf)
144 {
145 	struct net_device *ndev = to_net_dev(dev);
146 	ssize_t ret = -EINVAL;
147 
148 	read_lock(&dev_base_lock);
149 	if (dev_isalive(ndev))
150 		ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
151 	read_unlock(&dev_base_lock);
152 	return ret;
153 }
154 static DEVICE_ATTR_RO(address);
155 
156 static ssize_t broadcast_show(struct device *dev,
157 			      struct device_attribute *attr, char *buf)
158 {
159 	struct net_device *ndev = to_net_dev(dev);
160 
161 	if (dev_isalive(ndev))
162 		return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
163 	return -EINVAL;
164 }
165 static DEVICE_ATTR_RO(broadcast);
166 
167 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
168 {
169 	if (!netif_running(dev))
170 		return -EINVAL;
171 	return dev_change_carrier(dev, (bool)new_carrier);
172 }
173 
174 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
175 			     const char *buf, size_t len)
176 {
177 	return netdev_store(dev, attr, buf, len, change_carrier);
178 }
179 
180 static ssize_t carrier_show(struct device *dev,
181 			    struct device_attribute *attr, char *buf)
182 {
183 	struct net_device *netdev = to_net_dev(dev);
184 
185 	if (netif_running(netdev))
186 		return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
187 
188 	return -EINVAL;
189 }
190 static DEVICE_ATTR_RW(carrier);
191 
192 static 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_link_ksettings cmd;
203 
204 		if (!__ethtool_get_link_ksettings(netdev, &cmd))
205 			ret = sprintf(buf, fmt_dec, cmd.base.speed);
206 	}
207 	rtnl_unlock();
208 	return ret;
209 }
210 static DEVICE_ATTR_RO(speed);
211 
212 static 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_link_ksettings cmd;
223 
224 		if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
225 			const char *duplex;
226 
227 			switch (cmd.base.duplex) {
228 			case DUPLEX_HALF:
229 				duplex = "half";
230 				break;
231 			case DUPLEX_FULL:
232 				duplex = "full";
233 				break;
234 			default:
235 				duplex = "unknown";
236 				break;
237 			}
238 			ret = sprintf(buf, "%s\n", duplex);
239 		}
240 	}
241 	rtnl_unlock();
242 	return ret;
243 }
244 static DEVICE_ATTR_RO(duplex);
245 
246 static ssize_t dormant_show(struct device *dev,
247 			    struct device_attribute *attr, char *buf)
248 {
249 	struct net_device *netdev = to_net_dev(dev);
250 
251 	if (netif_running(netdev))
252 		return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
253 
254 	return -EINVAL;
255 }
256 static DEVICE_ATTR_RO(dormant);
257 
258 static const char *const operstates[] = {
259 	"unknown",
260 	"notpresent", /* currently unused */
261 	"down",
262 	"lowerlayerdown",
263 	"testing", /* currently unused */
264 	"dormant",
265 	"up"
266 };
267 
268 static ssize_t operstate_show(struct device *dev,
269 			      struct device_attribute *attr, char *buf)
270 {
271 	const struct net_device *netdev = to_net_dev(dev);
272 	unsigned char operstate;
273 
274 	read_lock(&dev_base_lock);
275 	operstate = netdev->operstate;
276 	if (!netif_running(netdev))
277 		operstate = IF_OPER_DOWN;
278 	read_unlock(&dev_base_lock);
279 
280 	if (operstate >= ARRAY_SIZE(operstates))
281 		return -EINVAL; /* should not happen */
282 
283 	return sprintf(buf, "%s\n", operstates[operstate]);
284 }
285 static DEVICE_ATTR_RO(operstate);
286 
287 static ssize_t carrier_changes_show(struct device *dev,
288 				    struct device_attribute *attr,
289 				    char *buf)
290 {
291 	struct net_device *netdev = to_net_dev(dev);
292 
293 	return sprintf(buf, fmt_dec,
294 		       atomic_read(&netdev->carrier_up_count) +
295 		       atomic_read(&netdev->carrier_down_count));
296 }
297 static DEVICE_ATTR_RO(carrier_changes);
298 
299 static ssize_t carrier_up_count_show(struct device *dev,
300 				     struct device_attribute *attr,
301 				     char *buf)
302 {
303 	struct net_device *netdev = to_net_dev(dev);
304 
305 	return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
306 }
307 static DEVICE_ATTR_RO(carrier_up_count);
308 
309 static ssize_t carrier_down_count_show(struct device *dev,
310 				       struct device_attribute *attr,
311 				       char *buf)
312 {
313 	struct net_device *netdev = to_net_dev(dev);
314 
315 	return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
316 }
317 static DEVICE_ATTR_RO(carrier_down_count);
318 
319 /* read-write attributes */
320 
321 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
322 {
323 	return dev_set_mtu(dev, (int)new_mtu);
324 }
325 
326 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
327 			 const char *buf, size_t len)
328 {
329 	return netdev_store(dev, attr, buf, len, change_mtu);
330 }
331 NETDEVICE_SHOW_RW(mtu, fmt_dec);
332 
333 static int change_flags(struct net_device *dev, unsigned long new_flags)
334 {
335 	return dev_change_flags(dev, (unsigned int)new_flags, NULL);
336 }
337 
338 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
339 			   const char *buf, size_t len)
340 {
341 	return netdev_store(dev, attr, buf, len, change_flags);
342 }
343 NETDEVICE_SHOW_RW(flags, fmt_hex);
344 
345 static ssize_t tx_queue_len_store(struct device *dev,
346 				  struct device_attribute *attr,
347 				  const char *buf, size_t len)
348 {
349 	if (!capable(CAP_NET_ADMIN))
350 		return -EPERM;
351 
352 	return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
353 }
354 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
355 
356 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
357 {
358 	dev->gro_flush_timeout = val;
359 	return 0;
360 }
361 
362 static ssize_t gro_flush_timeout_store(struct device *dev,
363 				       struct device_attribute *attr,
364 				       const char *buf, size_t len)
365 {
366 	if (!capable(CAP_NET_ADMIN))
367 		return -EPERM;
368 
369 	return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
370 }
371 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
372 
373 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
374 			     const char *buf, size_t len)
375 {
376 	struct net_device *netdev = to_net_dev(dev);
377 	struct net *net = dev_net(netdev);
378 	size_t count = len;
379 	ssize_t ret = 0;
380 
381 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
382 		return -EPERM;
383 
384 	/* ignore trailing newline */
385 	if (len >  0 && buf[len - 1] == '\n')
386 		--count;
387 
388 	if (!rtnl_trylock())
389 		return restart_syscall();
390 
391 	if (dev_isalive(netdev)) {
392 		ret = dev_set_alias(netdev, buf, count);
393 		if (ret < 0)
394 			goto err;
395 		ret = len;
396 		netdev_state_change(netdev);
397 	}
398 err:
399 	rtnl_unlock();
400 
401 	return ret;
402 }
403 
404 static ssize_t ifalias_show(struct device *dev,
405 			    struct device_attribute *attr, char *buf)
406 {
407 	const struct net_device *netdev = to_net_dev(dev);
408 	char tmp[IFALIASZ];
409 	ssize_t ret = 0;
410 
411 	ret = dev_get_alias(netdev, tmp, sizeof(tmp));
412 	if (ret > 0)
413 		ret = sprintf(buf, "%s\n", tmp);
414 	return ret;
415 }
416 static DEVICE_ATTR_RW(ifalias);
417 
418 static int change_group(struct net_device *dev, unsigned long new_group)
419 {
420 	dev_set_group(dev, (int)new_group);
421 	return 0;
422 }
423 
424 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
425 			   const char *buf, size_t len)
426 {
427 	return netdev_store(dev, attr, buf, len, change_group);
428 }
429 NETDEVICE_SHOW(group, fmt_dec);
430 static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
431 
432 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
433 {
434 	return dev_change_proto_down(dev, (bool)proto_down);
435 }
436 
437 static ssize_t proto_down_store(struct device *dev,
438 				struct device_attribute *attr,
439 				const char *buf, size_t len)
440 {
441 	return netdev_store(dev, attr, buf, len, change_proto_down);
442 }
443 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
444 
445 static ssize_t phys_port_id_show(struct device *dev,
446 				 struct device_attribute *attr, char *buf)
447 {
448 	struct net_device *netdev = to_net_dev(dev);
449 	ssize_t ret = -EINVAL;
450 
451 	if (!rtnl_trylock())
452 		return restart_syscall();
453 
454 	if (dev_isalive(netdev)) {
455 		struct netdev_phys_item_id ppid;
456 
457 		ret = dev_get_phys_port_id(netdev, &ppid);
458 		if (!ret)
459 			ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
460 	}
461 	rtnl_unlock();
462 
463 	return ret;
464 }
465 static DEVICE_ATTR_RO(phys_port_id);
466 
467 static ssize_t phys_port_name_show(struct device *dev,
468 				   struct device_attribute *attr, char *buf)
469 {
470 	struct net_device *netdev = to_net_dev(dev);
471 	ssize_t ret = -EINVAL;
472 
473 	if (!rtnl_trylock())
474 		return restart_syscall();
475 
476 	if (dev_isalive(netdev)) {
477 		char name[IFNAMSIZ];
478 
479 		ret = dev_get_phys_port_name(netdev, name, sizeof(name));
480 		if (!ret)
481 			ret = sprintf(buf, "%s\n", name);
482 	}
483 	rtnl_unlock();
484 
485 	return ret;
486 }
487 static DEVICE_ATTR_RO(phys_port_name);
488 
489 static ssize_t phys_switch_id_show(struct device *dev,
490 				   struct device_attribute *attr, char *buf)
491 {
492 	struct net_device *netdev = to_net_dev(dev);
493 	ssize_t ret = -EINVAL;
494 
495 	if (!rtnl_trylock())
496 		return restart_syscall();
497 
498 	if (dev_isalive(netdev)) {
499 		struct netdev_phys_item_id ppid = { };
500 
501 		ret = dev_get_port_parent_id(netdev, &ppid, false);
502 		if (!ret)
503 			ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
504 	}
505 	rtnl_unlock();
506 
507 	return ret;
508 }
509 static DEVICE_ATTR_RO(phys_switch_id);
510 
511 static struct attribute *net_class_attrs[] __ro_after_init = {
512 	&dev_attr_netdev_group.attr,
513 	&dev_attr_type.attr,
514 	&dev_attr_dev_id.attr,
515 	&dev_attr_dev_port.attr,
516 	&dev_attr_iflink.attr,
517 	&dev_attr_ifindex.attr,
518 	&dev_attr_name_assign_type.attr,
519 	&dev_attr_addr_assign_type.attr,
520 	&dev_attr_addr_len.attr,
521 	&dev_attr_link_mode.attr,
522 	&dev_attr_address.attr,
523 	&dev_attr_broadcast.attr,
524 	&dev_attr_speed.attr,
525 	&dev_attr_duplex.attr,
526 	&dev_attr_dormant.attr,
527 	&dev_attr_operstate.attr,
528 	&dev_attr_carrier_changes.attr,
529 	&dev_attr_ifalias.attr,
530 	&dev_attr_carrier.attr,
531 	&dev_attr_mtu.attr,
532 	&dev_attr_flags.attr,
533 	&dev_attr_tx_queue_len.attr,
534 	&dev_attr_gro_flush_timeout.attr,
535 	&dev_attr_phys_port_id.attr,
536 	&dev_attr_phys_port_name.attr,
537 	&dev_attr_phys_switch_id.attr,
538 	&dev_attr_proto_down.attr,
539 	&dev_attr_carrier_up_count.attr,
540 	&dev_attr_carrier_down_count.attr,
541 	NULL,
542 };
543 ATTRIBUTE_GROUPS(net_class);
544 
545 /* Show a given an attribute in the statistics group */
546 static ssize_t netstat_show(const struct device *d,
547 			    struct device_attribute *attr, char *buf,
548 			    unsigned long offset)
549 {
550 	struct net_device *dev = to_net_dev(d);
551 	ssize_t ret = -EINVAL;
552 
553 	WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
554 		offset % sizeof(u64) != 0);
555 
556 	read_lock(&dev_base_lock);
557 	if (dev_isalive(dev)) {
558 		struct rtnl_link_stats64 temp;
559 		const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
560 
561 		ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
562 	}
563 	read_unlock(&dev_base_lock);
564 	return ret;
565 }
566 
567 /* generate a read-only statistics attribute */
568 #define NETSTAT_ENTRY(name)						\
569 static ssize_t name##_show(struct device *d,				\
570 			   struct device_attribute *attr, char *buf)	\
571 {									\
572 	return netstat_show(d, attr, buf,				\
573 			    offsetof(struct rtnl_link_stats64, name));	\
574 }									\
575 static DEVICE_ATTR_RO(name)
576 
577 NETSTAT_ENTRY(rx_packets);
578 NETSTAT_ENTRY(tx_packets);
579 NETSTAT_ENTRY(rx_bytes);
580 NETSTAT_ENTRY(tx_bytes);
581 NETSTAT_ENTRY(rx_errors);
582 NETSTAT_ENTRY(tx_errors);
583 NETSTAT_ENTRY(rx_dropped);
584 NETSTAT_ENTRY(tx_dropped);
585 NETSTAT_ENTRY(multicast);
586 NETSTAT_ENTRY(collisions);
587 NETSTAT_ENTRY(rx_length_errors);
588 NETSTAT_ENTRY(rx_over_errors);
589 NETSTAT_ENTRY(rx_crc_errors);
590 NETSTAT_ENTRY(rx_frame_errors);
591 NETSTAT_ENTRY(rx_fifo_errors);
592 NETSTAT_ENTRY(rx_missed_errors);
593 NETSTAT_ENTRY(tx_aborted_errors);
594 NETSTAT_ENTRY(tx_carrier_errors);
595 NETSTAT_ENTRY(tx_fifo_errors);
596 NETSTAT_ENTRY(tx_heartbeat_errors);
597 NETSTAT_ENTRY(tx_window_errors);
598 NETSTAT_ENTRY(rx_compressed);
599 NETSTAT_ENTRY(tx_compressed);
600 NETSTAT_ENTRY(rx_nohandler);
601 
602 static struct attribute *netstat_attrs[] __ro_after_init = {
603 	&dev_attr_rx_packets.attr,
604 	&dev_attr_tx_packets.attr,
605 	&dev_attr_rx_bytes.attr,
606 	&dev_attr_tx_bytes.attr,
607 	&dev_attr_rx_errors.attr,
608 	&dev_attr_tx_errors.attr,
609 	&dev_attr_rx_dropped.attr,
610 	&dev_attr_tx_dropped.attr,
611 	&dev_attr_multicast.attr,
612 	&dev_attr_collisions.attr,
613 	&dev_attr_rx_length_errors.attr,
614 	&dev_attr_rx_over_errors.attr,
615 	&dev_attr_rx_crc_errors.attr,
616 	&dev_attr_rx_frame_errors.attr,
617 	&dev_attr_rx_fifo_errors.attr,
618 	&dev_attr_rx_missed_errors.attr,
619 	&dev_attr_tx_aborted_errors.attr,
620 	&dev_attr_tx_carrier_errors.attr,
621 	&dev_attr_tx_fifo_errors.attr,
622 	&dev_attr_tx_heartbeat_errors.attr,
623 	&dev_attr_tx_window_errors.attr,
624 	&dev_attr_rx_compressed.attr,
625 	&dev_attr_tx_compressed.attr,
626 	&dev_attr_rx_nohandler.attr,
627 	NULL
628 };
629 
630 static const struct attribute_group netstat_group = {
631 	.name  = "statistics",
632 	.attrs  = netstat_attrs,
633 };
634 
635 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
636 static struct attribute *wireless_attrs[] = {
637 	NULL
638 };
639 
640 static const struct attribute_group wireless_group = {
641 	.name = "wireless",
642 	.attrs = wireless_attrs,
643 };
644 #endif
645 
646 #else /* CONFIG_SYSFS */
647 #define net_class_groups	NULL
648 #endif /* CONFIG_SYSFS */
649 
650 #ifdef CONFIG_SYSFS
651 #define to_rx_queue_attr(_attr) \
652 	container_of(_attr, struct rx_queue_attribute, attr)
653 
654 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
655 
656 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
657 				  char *buf)
658 {
659 	const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
660 	struct netdev_rx_queue *queue = to_rx_queue(kobj);
661 
662 	if (!attribute->show)
663 		return -EIO;
664 
665 	return attribute->show(queue, buf);
666 }
667 
668 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
669 				   const char *buf, size_t count)
670 {
671 	const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
672 	struct netdev_rx_queue *queue = to_rx_queue(kobj);
673 
674 	if (!attribute->store)
675 		return -EIO;
676 
677 	return attribute->store(queue, buf, count);
678 }
679 
680 static const struct sysfs_ops rx_queue_sysfs_ops = {
681 	.show = rx_queue_attr_show,
682 	.store = rx_queue_attr_store,
683 };
684 
685 #ifdef CONFIG_RPS
686 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
687 {
688 	struct rps_map *map;
689 	cpumask_var_t mask;
690 	int i, len;
691 
692 	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
693 		return -ENOMEM;
694 
695 	rcu_read_lock();
696 	map = rcu_dereference(queue->rps_map);
697 	if (map)
698 		for (i = 0; i < map->len; i++)
699 			cpumask_set_cpu(map->cpus[i], mask);
700 
701 	len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
702 	rcu_read_unlock();
703 	free_cpumask_var(mask);
704 
705 	return len < PAGE_SIZE ? len : -EINVAL;
706 }
707 
708 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
709 			     const char *buf, size_t len)
710 {
711 	struct rps_map *old_map, *map;
712 	cpumask_var_t mask;
713 	int err, cpu, i;
714 	static DEFINE_MUTEX(rps_map_mutex);
715 
716 	if (!capable(CAP_NET_ADMIN))
717 		return -EPERM;
718 
719 	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
720 		return -ENOMEM;
721 
722 	err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
723 	if (err) {
724 		free_cpumask_var(mask);
725 		return err;
726 	}
727 
728 	map = kzalloc(max_t(unsigned int,
729 			    RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
730 		      GFP_KERNEL);
731 	if (!map) {
732 		free_cpumask_var(mask);
733 		return -ENOMEM;
734 	}
735 
736 	i = 0;
737 	for_each_cpu_and(cpu, mask, cpu_online_mask)
738 		map->cpus[i++] = cpu;
739 
740 	if (i) {
741 		map->len = i;
742 	} else {
743 		kfree(map);
744 		map = NULL;
745 	}
746 
747 	mutex_lock(&rps_map_mutex);
748 	old_map = rcu_dereference_protected(queue->rps_map,
749 					    mutex_is_locked(&rps_map_mutex));
750 	rcu_assign_pointer(queue->rps_map, map);
751 
752 	if (map)
753 		static_branch_inc(&rps_needed);
754 	if (old_map)
755 		static_branch_dec(&rps_needed);
756 
757 	mutex_unlock(&rps_map_mutex);
758 
759 	if (old_map)
760 		kfree_rcu(old_map, rcu);
761 
762 	free_cpumask_var(mask);
763 	return len;
764 }
765 
766 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
767 					   char *buf)
768 {
769 	struct rps_dev_flow_table *flow_table;
770 	unsigned long val = 0;
771 
772 	rcu_read_lock();
773 	flow_table = rcu_dereference(queue->rps_flow_table);
774 	if (flow_table)
775 		val = (unsigned long)flow_table->mask + 1;
776 	rcu_read_unlock();
777 
778 	return sprintf(buf, "%lu\n", val);
779 }
780 
781 static void rps_dev_flow_table_release(struct rcu_head *rcu)
782 {
783 	struct rps_dev_flow_table *table = container_of(rcu,
784 	    struct rps_dev_flow_table, rcu);
785 	vfree(table);
786 }
787 
788 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
789 					    const char *buf, size_t len)
790 {
791 	unsigned long mask, count;
792 	struct rps_dev_flow_table *table, *old_table;
793 	static DEFINE_SPINLOCK(rps_dev_flow_lock);
794 	int rc;
795 
796 	if (!capable(CAP_NET_ADMIN))
797 		return -EPERM;
798 
799 	rc = kstrtoul(buf, 0, &count);
800 	if (rc < 0)
801 		return rc;
802 
803 	if (count) {
804 		mask = count - 1;
805 		/* mask = roundup_pow_of_two(count) - 1;
806 		 * without overflows...
807 		 */
808 		while ((mask | (mask >> 1)) != mask)
809 			mask |= (mask >> 1);
810 		/* On 64 bit arches, must check mask fits in table->mask (u32),
811 		 * and on 32bit arches, must check
812 		 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
813 		 */
814 #if BITS_PER_LONG > 32
815 		if (mask > (unsigned long)(u32)mask)
816 			return -EINVAL;
817 #else
818 		if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
819 				/ sizeof(struct rps_dev_flow)) {
820 			/* Enforce a limit to prevent overflow */
821 			return -EINVAL;
822 		}
823 #endif
824 		table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
825 		if (!table)
826 			return -ENOMEM;
827 
828 		table->mask = mask;
829 		for (count = 0; count <= mask; count++)
830 			table->flows[count].cpu = RPS_NO_CPU;
831 	} else {
832 		table = NULL;
833 	}
834 
835 	spin_lock(&rps_dev_flow_lock);
836 	old_table = rcu_dereference_protected(queue->rps_flow_table,
837 					      lockdep_is_held(&rps_dev_flow_lock));
838 	rcu_assign_pointer(queue->rps_flow_table, table);
839 	spin_unlock(&rps_dev_flow_lock);
840 
841 	if (old_table)
842 		call_rcu(&old_table->rcu, rps_dev_flow_table_release);
843 
844 	return len;
845 }
846 
847 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
848 	= __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
849 
850 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
851 	= __ATTR(rps_flow_cnt, 0644,
852 		 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
853 #endif /* CONFIG_RPS */
854 
855 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
856 #ifdef CONFIG_RPS
857 	&rps_cpus_attribute.attr,
858 	&rps_dev_flow_table_cnt_attribute.attr,
859 #endif
860 	NULL
861 };
862 ATTRIBUTE_GROUPS(rx_queue_default);
863 
864 static void rx_queue_release(struct kobject *kobj)
865 {
866 	struct netdev_rx_queue *queue = to_rx_queue(kobj);
867 #ifdef CONFIG_RPS
868 	struct rps_map *map;
869 	struct rps_dev_flow_table *flow_table;
870 
871 	map = rcu_dereference_protected(queue->rps_map, 1);
872 	if (map) {
873 		RCU_INIT_POINTER(queue->rps_map, NULL);
874 		kfree_rcu(map, rcu);
875 	}
876 
877 	flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
878 	if (flow_table) {
879 		RCU_INIT_POINTER(queue->rps_flow_table, NULL);
880 		call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
881 	}
882 #endif
883 
884 	memset(kobj, 0, sizeof(*kobj));
885 	dev_put(queue->dev);
886 }
887 
888 static const void *rx_queue_namespace(struct kobject *kobj)
889 {
890 	struct netdev_rx_queue *queue = to_rx_queue(kobj);
891 	struct device *dev = &queue->dev->dev;
892 	const void *ns = NULL;
893 
894 	if (dev->class && dev->class->ns_type)
895 		ns = dev->class->namespace(dev);
896 
897 	return ns;
898 }
899 
900 static void rx_queue_get_ownership(struct kobject *kobj,
901 				   kuid_t *uid, kgid_t *gid)
902 {
903 	const struct net *net = rx_queue_namespace(kobj);
904 
905 	net_ns_get_ownership(net, uid, gid);
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_groups = rx_queue_default_groups,
912 	.namespace = rx_queue_namespace,
913 	.get_ownership = rx_queue_get_ownership,
914 };
915 
916 static int rx_queue_add_kobject(struct net_device *dev, int index)
917 {
918 	struct netdev_rx_queue *queue = dev->_rx + index;
919 	struct kobject *kobj = &queue->kobj;
920 	int error = 0;
921 
922 	/* Kobject_put later will trigger rx_queue_release call which
923 	 * decreases dev refcount: Take that reference here
924 	 */
925 	dev_hold(queue->dev);
926 
927 	kobj->kset = dev->queues_kset;
928 	error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
929 				     "rx-%u", index);
930 	if (error)
931 		goto err;
932 
933 	if (dev->sysfs_rx_queue_group) {
934 		error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
935 		if (error)
936 			goto err;
937 	}
938 
939 	kobject_uevent(kobj, KOBJ_ADD);
940 
941 	return error;
942 
943 err:
944 	kobject_put(kobj);
945 	return error;
946 }
947 
948 static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
949 				 kgid_t kgid)
950 {
951 	struct netdev_rx_queue *queue = dev->_rx + index;
952 	struct kobject *kobj = &queue->kobj;
953 	int error;
954 
955 	error = sysfs_change_owner(kobj, kuid, kgid);
956 	if (error)
957 		return error;
958 
959 	if (dev->sysfs_rx_queue_group)
960 		error = sysfs_group_change_owner(
961 			kobj, dev->sysfs_rx_queue_group, kuid, kgid);
962 
963 	return error;
964 }
965 #endif /* CONFIG_SYSFS */
966 
967 int
968 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
969 {
970 #ifdef CONFIG_SYSFS
971 	int i;
972 	int error = 0;
973 
974 #ifndef CONFIG_RPS
975 	if (!dev->sysfs_rx_queue_group)
976 		return 0;
977 #endif
978 	for (i = old_num; i < new_num; i++) {
979 		error = rx_queue_add_kobject(dev, i);
980 		if (error) {
981 			new_num = old_num;
982 			break;
983 		}
984 	}
985 
986 	while (--i >= new_num) {
987 		struct kobject *kobj = &dev->_rx[i].kobj;
988 
989 		if (!refcount_read(&dev_net(dev)->count))
990 			kobj->uevent_suppress = 1;
991 		if (dev->sysfs_rx_queue_group)
992 			sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
993 		kobject_put(kobj);
994 	}
995 
996 	return error;
997 #else
998 	return 0;
999 #endif
1000 }
1001 
1002 static int net_rx_queue_change_owner(struct net_device *dev, int num,
1003 				     kuid_t kuid, kgid_t kgid)
1004 {
1005 #ifdef CONFIG_SYSFS
1006 	int error = 0;
1007 	int i;
1008 
1009 #ifndef CONFIG_RPS
1010 	if (!dev->sysfs_rx_queue_group)
1011 		return 0;
1012 #endif
1013 	for (i = 0; i < num; i++) {
1014 		error = rx_queue_change_owner(dev, i, kuid, kgid);
1015 		if (error)
1016 			break;
1017 	}
1018 
1019 	return error;
1020 #else
1021 	return 0;
1022 #endif
1023 }
1024 
1025 #ifdef CONFIG_SYSFS
1026 /*
1027  * netdev_queue sysfs structures and functions.
1028  */
1029 struct netdev_queue_attribute {
1030 	struct attribute attr;
1031 	ssize_t (*show)(struct netdev_queue *queue, char *buf);
1032 	ssize_t (*store)(struct netdev_queue *queue,
1033 			 const char *buf, size_t len);
1034 };
1035 #define to_netdev_queue_attr(_attr) \
1036 	container_of(_attr, struct netdev_queue_attribute, attr)
1037 
1038 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1039 
1040 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1041 				      struct attribute *attr, char *buf)
1042 {
1043 	const struct netdev_queue_attribute *attribute
1044 		= to_netdev_queue_attr(attr);
1045 	struct netdev_queue *queue = to_netdev_queue(kobj);
1046 
1047 	if (!attribute->show)
1048 		return -EIO;
1049 
1050 	return attribute->show(queue, buf);
1051 }
1052 
1053 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1054 				       struct attribute *attr,
1055 				       const char *buf, size_t count)
1056 {
1057 	const struct netdev_queue_attribute *attribute
1058 		= to_netdev_queue_attr(attr);
1059 	struct netdev_queue *queue = to_netdev_queue(kobj);
1060 
1061 	if (!attribute->store)
1062 		return -EIO;
1063 
1064 	return attribute->store(queue, buf, count);
1065 }
1066 
1067 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1068 	.show = netdev_queue_attr_show,
1069 	.store = netdev_queue_attr_store,
1070 };
1071 
1072 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1073 {
1074 	unsigned long trans_timeout;
1075 
1076 	spin_lock_irq(&queue->_xmit_lock);
1077 	trans_timeout = queue->trans_timeout;
1078 	spin_unlock_irq(&queue->_xmit_lock);
1079 
1080 	return sprintf(buf, "%lu", trans_timeout);
1081 }
1082 
1083 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1084 {
1085 	struct net_device *dev = queue->dev;
1086 	unsigned int i;
1087 
1088 	i = queue - dev->_tx;
1089 	BUG_ON(i >= dev->num_tx_queues);
1090 
1091 	return i;
1092 }
1093 
1094 static ssize_t traffic_class_show(struct netdev_queue *queue,
1095 				  char *buf)
1096 {
1097 	struct net_device *dev = queue->dev;
1098 	int index;
1099 	int tc;
1100 
1101 	if (!netif_is_multiqueue(dev))
1102 		return -ENOENT;
1103 
1104 	index = get_netdev_queue_index(queue);
1105 
1106 	/* If queue belongs to subordinate dev use its TC mapping */
1107 	dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1108 
1109 	tc = netdev_txq_to_tc(dev, index);
1110 	if (tc < 0)
1111 		return -EINVAL;
1112 
1113 	/* We can report the traffic class one of two ways:
1114 	 * Subordinate device traffic classes are reported with the traffic
1115 	 * class first, and then the subordinate class so for example TC0 on
1116 	 * subordinate device 2 will be reported as "0-2". If the queue
1117 	 * belongs to the root device it will be reported with just the
1118 	 * traffic class, so just "0" for TC 0 for example.
1119 	 */
1120 	return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1121 				 sprintf(buf, "%u\n", tc);
1122 }
1123 
1124 #ifdef CONFIG_XPS
1125 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1126 			       char *buf)
1127 {
1128 	return sprintf(buf, "%lu\n", queue->tx_maxrate);
1129 }
1130 
1131 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1132 				const char *buf, size_t len)
1133 {
1134 	struct net_device *dev = queue->dev;
1135 	int err, index = get_netdev_queue_index(queue);
1136 	u32 rate = 0;
1137 
1138 	if (!capable(CAP_NET_ADMIN))
1139 		return -EPERM;
1140 
1141 	err = kstrtou32(buf, 10, &rate);
1142 	if (err < 0)
1143 		return err;
1144 
1145 	if (!rtnl_trylock())
1146 		return restart_syscall();
1147 
1148 	err = -EOPNOTSUPP;
1149 	if (dev->netdev_ops->ndo_set_tx_maxrate)
1150 		err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1151 
1152 	rtnl_unlock();
1153 	if (!err) {
1154 		queue->tx_maxrate = rate;
1155 		return len;
1156 	}
1157 	return err;
1158 }
1159 
1160 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1161 	= __ATTR_RW(tx_maxrate);
1162 #endif
1163 
1164 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1165 	= __ATTR_RO(tx_timeout);
1166 
1167 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1168 	= __ATTR_RO(traffic_class);
1169 
1170 #ifdef CONFIG_BQL
1171 /*
1172  * Byte queue limits sysfs structures and functions.
1173  */
1174 static ssize_t bql_show(char *buf, unsigned int value)
1175 {
1176 	return sprintf(buf, "%u\n", value);
1177 }
1178 
1179 static ssize_t bql_set(const char *buf, const size_t count,
1180 		       unsigned int *pvalue)
1181 {
1182 	unsigned int value;
1183 	int err;
1184 
1185 	if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1186 		value = DQL_MAX_LIMIT;
1187 	} else {
1188 		err = kstrtouint(buf, 10, &value);
1189 		if (err < 0)
1190 			return err;
1191 		if (value > DQL_MAX_LIMIT)
1192 			return -EINVAL;
1193 	}
1194 
1195 	*pvalue = value;
1196 
1197 	return count;
1198 }
1199 
1200 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1201 				  char *buf)
1202 {
1203 	struct dql *dql = &queue->dql;
1204 
1205 	return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1206 }
1207 
1208 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1209 				 const char *buf, size_t len)
1210 {
1211 	struct dql *dql = &queue->dql;
1212 	unsigned int value;
1213 	int err;
1214 
1215 	err = kstrtouint(buf, 10, &value);
1216 	if (err < 0)
1217 		return err;
1218 
1219 	dql->slack_hold_time = msecs_to_jiffies(value);
1220 
1221 	return len;
1222 }
1223 
1224 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1225 	= __ATTR(hold_time, 0644,
1226 		 bql_show_hold_time, bql_set_hold_time);
1227 
1228 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1229 				 char *buf)
1230 {
1231 	struct dql *dql = &queue->dql;
1232 
1233 	return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1234 }
1235 
1236 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1237 	__ATTR(inflight, 0444, bql_show_inflight, NULL);
1238 
1239 #define BQL_ATTR(NAME, FIELD)						\
1240 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,		\
1241 				 char *buf)				\
1242 {									\
1243 	return bql_show(buf, queue->dql.FIELD);				\
1244 }									\
1245 									\
1246 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,		\
1247 				const char *buf, size_t len)		\
1248 {									\
1249 	return bql_set(buf, len, &queue->dql.FIELD);			\
1250 }									\
1251 									\
1252 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1253 	= __ATTR(NAME, 0644,				\
1254 		 bql_show_ ## NAME, bql_set_ ## NAME)
1255 
1256 BQL_ATTR(limit, limit);
1257 BQL_ATTR(limit_max, max_limit);
1258 BQL_ATTR(limit_min, min_limit);
1259 
1260 static struct attribute *dql_attrs[] __ro_after_init = {
1261 	&bql_limit_attribute.attr,
1262 	&bql_limit_max_attribute.attr,
1263 	&bql_limit_min_attribute.attr,
1264 	&bql_hold_time_attribute.attr,
1265 	&bql_inflight_attribute.attr,
1266 	NULL
1267 };
1268 
1269 static const struct attribute_group dql_group = {
1270 	.name  = "byte_queue_limits",
1271 	.attrs  = dql_attrs,
1272 };
1273 #endif /* CONFIG_BQL */
1274 
1275 #ifdef CONFIG_XPS
1276 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1277 			     char *buf)
1278 {
1279 	struct net_device *dev = queue->dev;
1280 	int cpu, len, num_tc = 1, tc = 0;
1281 	struct xps_dev_maps *dev_maps;
1282 	cpumask_var_t mask;
1283 	unsigned long index;
1284 
1285 	if (!netif_is_multiqueue(dev))
1286 		return -ENOENT;
1287 
1288 	index = get_netdev_queue_index(queue);
1289 
1290 	if (dev->num_tc) {
1291 		/* Do not allow XPS on subordinate device directly */
1292 		num_tc = dev->num_tc;
1293 		if (num_tc < 0)
1294 			return -EINVAL;
1295 
1296 		/* If queue belongs to subordinate dev use its map */
1297 		dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1298 
1299 		tc = netdev_txq_to_tc(dev, index);
1300 		if (tc < 0)
1301 			return -EINVAL;
1302 	}
1303 
1304 	if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1305 		return -ENOMEM;
1306 
1307 	rcu_read_lock();
1308 	dev_maps = rcu_dereference(dev->xps_cpus_map);
1309 	if (dev_maps) {
1310 		for_each_possible_cpu(cpu) {
1311 			int i, tci = cpu * num_tc + tc;
1312 			struct xps_map *map;
1313 
1314 			map = rcu_dereference(dev_maps->attr_map[tci]);
1315 			if (!map)
1316 				continue;
1317 
1318 			for (i = map->len; i--;) {
1319 				if (map->queues[i] == index) {
1320 					cpumask_set_cpu(cpu, mask);
1321 					break;
1322 				}
1323 			}
1324 		}
1325 	}
1326 	rcu_read_unlock();
1327 
1328 	len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1329 	free_cpumask_var(mask);
1330 	return len < PAGE_SIZE ? len : -EINVAL;
1331 }
1332 
1333 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1334 			      const char *buf, size_t len)
1335 {
1336 	struct net_device *dev = queue->dev;
1337 	unsigned long index;
1338 	cpumask_var_t mask;
1339 	int err;
1340 
1341 	if (!netif_is_multiqueue(dev))
1342 		return -ENOENT;
1343 
1344 	if (!capable(CAP_NET_ADMIN))
1345 		return -EPERM;
1346 
1347 	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1348 		return -ENOMEM;
1349 
1350 	index = get_netdev_queue_index(queue);
1351 
1352 	err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1353 	if (err) {
1354 		free_cpumask_var(mask);
1355 		return err;
1356 	}
1357 
1358 	err = netif_set_xps_queue(dev, mask, index);
1359 
1360 	free_cpumask_var(mask);
1361 
1362 	return err ? : len;
1363 }
1364 
1365 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1366 	= __ATTR_RW(xps_cpus);
1367 
1368 static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1369 {
1370 	struct net_device *dev = queue->dev;
1371 	struct xps_dev_maps *dev_maps;
1372 	unsigned long *mask, index;
1373 	int j, len, num_tc = 1, tc = 0;
1374 
1375 	index = get_netdev_queue_index(queue);
1376 
1377 	if (dev->num_tc) {
1378 		num_tc = dev->num_tc;
1379 		tc = netdev_txq_to_tc(dev, index);
1380 		if (tc < 0)
1381 			return -EINVAL;
1382 	}
1383 	mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1384 	if (!mask)
1385 		return -ENOMEM;
1386 
1387 	rcu_read_lock();
1388 	dev_maps = rcu_dereference(dev->xps_rxqs_map);
1389 	if (!dev_maps)
1390 		goto out_no_maps;
1391 
1392 	for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1393 	     j < dev->num_rx_queues;) {
1394 		int i, tci = j * num_tc + tc;
1395 		struct xps_map *map;
1396 
1397 		map = rcu_dereference(dev_maps->attr_map[tci]);
1398 		if (!map)
1399 			continue;
1400 
1401 		for (i = map->len; i--;) {
1402 			if (map->queues[i] == index) {
1403 				set_bit(j, mask);
1404 				break;
1405 			}
1406 		}
1407 	}
1408 out_no_maps:
1409 	rcu_read_unlock();
1410 
1411 	len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1412 	bitmap_free(mask);
1413 
1414 	return len < PAGE_SIZE ? len : -EINVAL;
1415 }
1416 
1417 static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1418 			      size_t len)
1419 {
1420 	struct net_device *dev = queue->dev;
1421 	struct net *net = dev_net(dev);
1422 	unsigned long *mask, index;
1423 	int err;
1424 
1425 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1426 		return -EPERM;
1427 
1428 	mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1429 	if (!mask)
1430 		return -ENOMEM;
1431 
1432 	index = get_netdev_queue_index(queue);
1433 
1434 	err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1435 	if (err) {
1436 		bitmap_free(mask);
1437 		return err;
1438 	}
1439 
1440 	cpus_read_lock();
1441 	err = __netif_set_xps_queue(dev, mask, index, true);
1442 	cpus_read_unlock();
1443 
1444 	bitmap_free(mask);
1445 	return err ? : len;
1446 }
1447 
1448 static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1449 	= __ATTR_RW(xps_rxqs);
1450 #endif /* CONFIG_XPS */
1451 
1452 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1453 	&queue_trans_timeout.attr,
1454 	&queue_traffic_class.attr,
1455 #ifdef CONFIG_XPS
1456 	&xps_cpus_attribute.attr,
1457 	&xps_rxqs_attribute.attr,
1458 	&queue_tx_maxrate.attr,
1459 #endif
1460 	NULL
1461 };
1462 ATTRIBUTE_GROUPS(netdev_queue_default);
1463 
1464 static void netdev_queue_release(struct kobject *kobj)
1465 {
1466 	struct netdev_queue *queue = to_netdev_queue(kobj);
1467 
1468 	memset(kobj, 0, sizeof(*kobj));
1469 	dev_put(queue->dev);
1470 }
1471 
1472 static const void *netdev_queue_namespace(struct kobject *kobj)
1473 {
1474 	struct netdev_queue *queue = to_netdev_queue(kobj);
1475 	struct device *dev = &queue->dev->dev;
1476 	const void *ns = NULL;
1477 
1478 	if (dev->class && dev->class->ns_type)
1479 		ns = dev->class->namespace(dev);
1480 
1481 	return ns;
1482 }
1483 
1484 static void netdev_queue_get_ownership(struct kobject *kobj,
1485 				       kuid_t *uid, kgid_t *gid)
1486 {
1487 	const struct net *net = netdev_queue_namespace(kobj);
1488 
1489 	net_ns_get_ownership(net, uid, gid);
1490 }
1491 
1492 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1493 	.sysfs_ops = &netdev_queue_sysfs_ops,
1494 	.release = netdev_queue_release,
1495 	.default_groups = netdev_queue_default_groups,
1496 	.namespace = netdev_queue_namespace,
1497 	.get_ownership = netdev_queue_get_ownership,
1498 };
1499 
1500 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1501 {
1502 	struct netdev_queue *queue = dev->_tx + index;
1503 	struct kobject *kobj = &queue->kobj;
1504 	int error = 0;
1505 
1506 	/* Kobject_put later will trigger netdev_queue_release call
1507 	 * which decreases dev refcount: Take that reference here
1508 	 */
1509 	dev_hold(queue->dev);
1510 
1511 	kobj->kset = dev->queues_kset;
1512 	error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1513 				     "tx-%u", index);
1514 	if (error)
1515 		goto err;
1516 
1517 #ifdef CONFIG_BQL
1518 	error = sysfs_create_group(kobj, &dql_group);
1519 	if (error)
1520 		goto err;
1521 #endif
1522 
1523 	kobject_uevent(kobj, KOBJ_ADD);
1524 	return 0;
1525 
1526 err:
1527 	kobject_put(kobj);
1528 	return error;
1529 }
1530 
1531 static int tx_queue_change_owner(struct net_device *ndev, int index,
1532 				 kuid_t kuid, kgid_t kgid)
1533 {
1534 	struct netdev_queue *queue = ndev->_tx + index;
1535 	struct kobject *kobj = &queue->kobj;
1536 	int error;
1537 
1538 	error = sysfs_change_owner(kobj, kuid, kgid);
1539 	if (error)
1540 		return error;
1541 
1542 #ifdef CONFIG_BQL
1543 	error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
1544 #endif
1545 	return error;
1546 }
1547 #endif /* CONFIG_SYSFS */
1548 
1549 int
1550 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1551 {
1552 #ifdef CONFIG_SYSFS
1553 	int i;
1554 	int error = 0;
1555 
1556 	for (i = old_num; i < new_num; i++) {
1557 		error = netdev_queue_add_kobject(dev, i);
1558 		if (error) {
1559 			new_num = old_num;
1560 			break;
1561 		}
1562 	}
1563 
1564 	while (--i >= new_num) {
1565 		struct netdev_queue *queue = dev->_tx + i;
1566 
1567 		if (!refcount_read(&dev_net(dev)->count))
1568 			queue->kobj.uevent_suppress = 1;
1569 #ifdef CONFIG_BQL
1570 		sysfs_remove_group(&queue->kobj, &dql_group);
1571 #endif
1572 		kobject_put(&queue->kobj);
1573 	}
1574 
1575 	return error;
1576 #else
1577 	return 0;
1578 #endif /* CONFIG_SYSFS */
1579 }
1580 
1581 static int net_tx_queue_change_owner(struct net_device *dev, int num,
1582 				     kuid_t kuid, kgid_t kgid)
1583 {
1584 #ifdef CONFIG_SYSFS
1585 	int error = 0;
1586 	int i;
1587 
1588 	for (i = 0; i < num; i++) {
1589 		error = tx_queue_change_owner(dev, i, kuid, kgid);
1590 		if (error)
1591 			break;
1592 	}
1593 
1594 	return error;
1595 #else
1596 	return 0;
1597 #endif /* CONFIG_SYSFS */
1598 }
1599 
1600 static int register_queue_kobjects(struct net_device *dev)
1601 {
1602 	int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1603 
1604 #ifdef CONFIG_SYSFS
1605 	dev->queues_kset = kset_create_and_add("queues",
1606 					       NULL, &dev->dev.kobj);
1607 	if (!dev->queues_kset)
1608 		return -ENOMEM;
1609 	real_rx = dev->real_num_rx_queues;
1610 #endif
1611 	real_tx = dev->real_num_tx_queues;
1612 
1613 	error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1614 	if (error)
1615 		goto error;
1616 	rxq = real_rx;
1617 
1618 	error = netdev_queue_update_kobjects(dev, 0, real_tx);
1619 	if (error)
1620 		goto error;
1621 	txq = real_tx;
1622 
1623 	return 0;
1624 
1625 error:
1626 	netdev_queue_update_kobjects(dev, txq, 0);
1627 	net_rx_queue_update_kobjects(dev, rxq, 0);
1628 #ifdef CONFIG_SYSFS
1629 	kset_unregister(dev->queues_kset);
1630 #endif
1631 	return error;
1632 }
1633 
1634 static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
1635 {
1636 	int error = 0, real_rx = 0, real_tx = 0;
1637 
1638 #ifdef CONFIG_SYSFS
1639 	if (ndev->queues_kset) {
1640 		error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
1641 		if (error)
1642 			return error;
1643 	}
1644 	real_rx = ndev->real_num_rx_queues;
1645 #endif
1646 	real_tx = ndev->real_num_tx_queues;
1647 
1648 	error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
1649 	if (error)
1650 		return error;
1651 
1652 	error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
1653 	if (error)
1654 		return error;
1655 
1656 	return 0;
1657 }
1658 
1659 static void remove_queue_kobjects(struct net_device *dev)
1660 {
1661 	int real_rx = 0, real_tx = 0;
1662 
1663 #ifdef CONFIG_SYSFS
1664 	real_rx = dev->real_num_rx_queues;
1665 #endif
1666 	real_tx = dev->real_num_tx_queues;
1667 
1668 	net_rx_queue_update_kobjects(dev, real_rx, 0);
1669 	netdev_queue_update_kobjects(dev, real_tx, 0);
1670 #ifdef CONFIG_SYSFS
1671 	kset_unregister(dev->queues_kset);
1672 #endif
1673 }
1674 
1675 static bool net_current_may_mount(void)
1676 {
1677 	struct net *net = current->nsproxy->net_ns;
1678 
1679 	return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1680 }
1681 
1682 static void *net_grab_current_ns(void)
1683 {
1684 	struct net *ns = current->nsproxy->net_ns;
1685 #ifdef CONFIG_NET_NS
1686 	if (ns)
1687 		refcount_inc(&ns->passive);
1688 #endif
1689 	return ns;
1690 }
1691 
1692 static const void *net_initial_ns(void)
1693 {
1694 	return &init_net;
1695 }
1696 
1697 static const void *net_netlink_ns(struct sock *sk)
1698 {
1699 	return sock_net(sk);
1700 }
1701 
1702 const struct kobj_ns_type_operations net_ns_type_operations = {
1703 	.type = KOBJ_NS_TYPE_NET,
1704 	.current_may_mount = net_current_may_mount,
1705 	.grab_current_ns = net_grab_current_ns,
1706 	.netlink_ns = net_netlink_ns,
1707 	.initial_ns = net_initial_ns,
1708 	.drop_ns = net_drop_ns,
1709 };
1710 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1711 
1712 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1713 {
1714 	struct net_device *dev = to_net_dev(d);
1715 	int retval;
1716 
1717 	/* pass interface to uevent. */
1718 	retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1719 	if (retval)
1720 		goto exit;
1721 
1722 	/* pass ifindex to uevent.
1723 	 * ifindex is useful as it won't change (interface name may change)
1724 	 * and is what RtNetlink uses natively.
1725 	 */
1726 	retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1727 
1728 exit:
1729 	return retval;
1730 }
1731 
1732 /*
1733  *	netdev_release -- destroy and free a dead device.
1734  *	Called when last reference to device kobject is gone.
1735  */
1736 static void netdev_release(struct device *d)
1737 {
1738 	struct net_device *dev = to_net_dev(d);
1739 
1740 	BUG_ON(dev->reg_state != NETREG_RELEASED);
1741 
1742 	/* no need to wait for rcu grace period:
1743 	 * device is dead and about to be freed.
1744 	 */
1745 	kfree(rcu_access_pointer(dev->ifalias));
1746 	netdev_freemem(dev);
1747 }
1748 
1749 static const void *net_namespace(struct device *d)
1750 {
1751 	struct net_device *dev = to_net_dev(d);
1752 
1753 	return dev_net(dev);
1754 }
1755 
1756 static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1757 {
1758 	struct net_device *dev = to_net_dev(d);
1759 	const struct net *net = dev_net(dev);
1760 
1761 	net_ns_get_ownership(net, uid, gid);
1762 }
1763 
1764 static struct class net_class __ro_after_init = {
1765 	.name = "net",
1766 	.dev_release = netdev_release,
1767 	.dev_groups = net_class_groups,
1768 	.dev_uevent = netdev_uevent,
1769 	.ns_type = &net_ns_type_operations,
1770 	.namespace = net_namespace,
1771 	.get_ownership = net_get_ownership,
1772 };
1773 
1774 #ifdef CONFIG_OF_NET
1775 static int of_dev_node_match(struct device *dev, const void *data)
1776 {
1777 	int ret = 0;
1778 
1779 	if (dev->parent)
1780 		ret = dev->parent->of_node == data;
1781 
1782 	return ret == 0 ? dev->of_node == data : ret;
1783 }
1784 
1785 /*
1786  * of_find_net_device_by_node - lookup the net device for the device node
1787  * @np: OF device node
1788  *
1789  * Looks up the net_device structure corresponding with the device node.
1790  * If successful, returns a pointer to the net_device with the embedded
1791  * struct device refcount incremented by one, or NULL on failure. The
1792  * refcount must be dropped when done with the net_device.
1793  */
1794 struct net_device *of_find_net_device_by_node(struct device_node *np)
1795 {
1796 	struct device *dev;
1797 
1798 	dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1799 	if (!dev)
1800 		return NULL;
1801 
1802 	return to_net_dev(dev);
1803 }
1804 EXPORT_SYMBOL(of_find_net_device_by_node);
1805 #endif
1806 
1807 /* Delete sysfs entries but hold kobject reference until after all
1808  * netdev references are gone.
1809  */
1810 void netdev_unregister_kobject(struct net_device *ndev)
1811 {
1812 	struct device *dev = &ndev->dev;
1813 
1814 	if (!refcount_read(&dev_net(ndev)->count))
1815 		dev_set_uevent_suppress(dev, 1);
1816 
1817 	kobject_get(&dev->kobj);
1818 
1819 	remove_queue_kobjects(ndev);
1820 
1821 	pm_runtime_set_memalloc_noio(dev, false);
1822 
1823 	device_del(dev);
1824 }
1825 
1826 /* Create sysfs entries for network device. */
1827 int netdev_register_kobject(struct net_device *ndev)
1828 {
1829 	struct device *dev = &ndev->dev;
1830 	const struct attribute_group **groups = ndev->sysfs_groups;
1831 	int error = 0;
1832 
1833 	device_initialize(dev);
1834 	dev->class = &net_class;
1835 	dev->platform_data = ndev;
1836 	dev->groups = groups;
1837 
1838 	dev_set_name(dev, "%s", ndev->name);
1839 
1840 #ifdef CONFIG_SYSFS
1841 	/* Allow for a device specific group */
1842 	if (*groups)
1843 		groups++;
1844 
1845 	*groups++ = &netstat_group;
1846 
1847 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1848 	if (ndev->ieee80211_ptr)
1849 		*groups++ = &wireless_group;
1850 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1851 	else if (ndev->wireless_handlers)
1852 		*groups++ = &wireless_group;
1853 #endif
1854 #endif
1855 #endif /* CONFIG_SYSFS */
1856 
1857 	error = device_add(dev);
1858 	if (error)
1859 		return error;
1860 
1861 	error = register_queue_kobjects(ndev);
1862 	if (error) {
1863 		device_del(dev);
1864 		return error;
1865 	}
1866 
1867 	pm_runtime_set_memalloc_noio(dev, true);
1868 
1869 	return error;
1870 }
1871 
1872 /* Change owner for sysfs entries when moving network devices across network
1873  * namespaces owned by different user namespaces.
1874  */
1875 int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
1876 			const struct net *net_new)
1877 {
1878 	struct device *dev = &ndev->dev;
1879 	kuid_t old_uid, new_uid;
1880 	kgid_t old_gid, new_gid;
1881 	int error;
1882 
1883 	net_ns_get_ownership(net_old, &old_uid, &old_gid);
1884 	net_ns_get_ownership(net_new, &new_uid, &new_gid);
1885 
1886 	/* The network namespace was changed but the owning user namespace is
1887 	 * identical so there's no need to change the owner of sysfs entries.
1888 	 */
1889 	if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid))
1890 		return 0;
1891 
1892 	error = device_change_owner(dev, new_uid, new_gid);
1893 	if (error)
1894 		return error;
1895 
1896 	error = queue_change_owner(ndev, new_uid, new_gid);
1897 	if (error)
1898 		return error;
1899 
1900 	return 0;
1901 }
1902 
1903 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1904 				const void *ns)
1905 {
1906 	return class_create_file_ns(&net_class, class_attr, ns);
1907 }
1908 EXPORT_SYMBOL(netdev_class_create_file_ns);
1909 
1910 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1911 				 const void *ns)
1912 {
1913 	class_remove_file_ns(&net_class, class_attr, ns);
1914 }
1915 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1916 
1917 int __init netdev_kobject_init(void)
1918 {
1919 	kobj_ns_type_register(&net_ns_type_operations);
1920 	return class_register(&net_class);
1921 }
1922