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Linux/net/core/net-sysfs.c

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  1 /*
  2  * net-sysfs.c - network device class and attributes
  3  *
  4  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
  5  *
  6  *      This program is free software; you can redistribute it and/or
  7  *      modify it under the terms of the GNU General Public License
  8  *      as published by the Free Software Foundation; either version
  9  *      2 of the License, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/capability.h>
 13 #include <linux/kernel.h>
 14 #include <linux/netdevice.h>
 15 #include <net/switchdev.h>
 16 #include <linux/if_arp.h>
 17 #include <linux/slab.h>
 18 #include <linux/nsproxy.h>
 19 #include <net/sock.h>
 20 #include <net/net_namespace.h>
 21 #include <linux/rtnetlink.h>
 22 #include <linux/vmalloc.h>
 23 #include <linux/export.h>
 24 #include <linux/jiffies.h>
 25 #include <linux/pm_runtime.h>
 26 
 27 #include "net-sysfs.h"
 28 
 29 #ifdef CONFIG_SYSFS
 30 static const char fmt_hex[] = "%#x\n";
 31 static const char fmt_long_hex[] = "%#lx\n";
 32 static const char fmt_dec[] = "%d\n";
 33 static const char fmt_udec[] = "%u\n";
 34 static const char fmt_ulong[] = "%lu\n";
 35 static const char fmt_u64[] = "%llu\n";
 36 
 37 static inline int dev_isalive(const struct net_device *dev)
 38 {
 39         return dev->reg_state <= NETREG_REGISTERED;
 40 }
 41 
 42 /* use same locking rules as GIF* ioctl's */
 43 static ssize_t netdev_show(const struct device *dev,
 44                            struct device_attribute *attr, char *buf,
 45                            ssize_t (*format)(const struct net_device *, char *))
 46 {
 47         struct net_device *ndev = to_net_dev(dev);
 48         ssize_t ret = -EINVAL;
 49 
 50         read_lock(&dev_base_lock);
 51         if (dev_isalive(ndev))
 52                 ret = (*format)(ndev, buf);
 53         read_unlock(&dev_base_lock);
 54 
 55         return ret;
 56 }
 57 
 58 /* generate a show function for simple field */
 59 #define NETDEVICE_SHOW(field, format_string)                            \
 60 static ssize_t format_##field(const struct net_device *dev, char *buf)  \
 61 {                                                                       \
 62         return sprintf(buf, format_string, dev->field);                 \
 63 }                                                                       \
 64 static ssize_t field##_show(struct device *dev,                         \
 65                             struct device_attribute *attr, char *buf)   \
 66 {                                                                       \
 67         return netdev_show(dev, attr, buf, format_##field);             \
 68 }                                                                       \
 69 
 70 #define NETDEVICE_SHOW_RO(field, format_string)                         \
 71 NETDEVICE_SHOW(field, format_string);                                   \
 72 static DEVICE_ATTR_RO(field)
 73 
 74 #define NETDEVICE_SHOW_RW(field, format_string)                         \
 75 NETDEVICE_SHOW(field, format_string);                                   \
 76 static DEVICE_ATTR_RW(field)
 77 
 78 /* use same locking and permission rules as SIF* ioctl's */
 79 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
 80                             const char *buf, size_t len,
 81                             int (*set)(struct net_device *, unsigned long))
 82 {
 83         struct net_device *netdev = to_net_dev(dev);
 84         struct net *net = dev_net(netdev);
 85         unsigned long new;
 86         int ret = -EINVAL;
 87 
 88         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 89                 return -EPERM;
 90 
 91         ret = kstrtoul(buf, 0, &new);
 92         if (ret)
 93                 goto err;
 94 
 95         if (!rtnl_trylock())
 96                 return restart_syscall();
 97 
 98         if (dev_isalive(netdev)) {
 99                 if ((ret = (*set)(netdev, new)) == 0)
100                         ret = len;
101         }
102         rtnl_unlock();
103  err:
104         return ret;
105 }
106 
107 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
108 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
109 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
110 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
111 NETDEVICE_SHOW_RO(iflink, fmt_dec);
112 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
113 NETDEVICE_SHOW_RO(type, fmt_dec);
114 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
115 
116 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
117 {
118         return sprintf(buf, fmt_dec, dev->name_assign_type);
119 }
120 
121 static ssize_t name_assign_type_show(struct device *dev,
122                                      struct device_attribute *attr,
123                                      char *buf)
124 {
125         struct net_device *ndev = to_net_dev(dev);
126         ssize_t ret = -EINVAL;
127 
128         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
129                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
130 
131         return ret;
132 }
133 static DEVICE_ATTR_RO(name_assign_type);
134 
135 /* use same locking rules as GIFHWADDR ioctl's */
136 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
137                             char *buf)
138 {
139         struct net_device *ndev = to_net_dev(dev);
140         ssize_t ret = -EINVAL;
141 
142         read_lock(&dev_base_lock);
143         if (dev_isalive(ndev))
144                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
145         read_unlock(&dev_base_lock);
146         return ret;
147 }
148 static DEVICE_ATTR_RO(address);
149 
150 static ssize_t broadcast_show(struct device *dev,
151                               struct device_attribute *attr, char *buf)
152 {
153         struct net_device *ndev = to_net_dev(dev);
154         if (dev_isalive(ndev))
155                 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
156         return -EINVAL;
157 }
158 static DEVICE_ATTR_RO(broadcast);
159 
160 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
161 {
162         if (!netif_running(dev))
163                 return -EINVAL;
164         return dev_change_carrier(dev, (bool) new_carrier);
165 }
166 
167 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
168                              const char *buf, size_t len)
169 {
170         return netdev_store(dev, attr, buf, len, change_carrier);
171 }
172 
173 static ssize_t carrier_show(struct device *dev,
174                             struct device_attribute *attr, char *buf)
175 {
176         struct net_device *netdev = to_net_dev(dev);
177         if (netif_running(netdev)) {
178                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
179         }
180         return -EINVAL;
181 }
182 static DEVICE_ATTR_RW(carrier);
183 
184 static ssize_t speed_show(struct device *dev,
185                           struct device_attribute *attr, char *buf)
186 {
187         struct net_device *netdev = to_net_dev(dev);
188         int ret = -EINVAL;
189 
190         if (!rtnl_trylock())
191                 return restart_syscall();
192 
193         if (netif_running(netdev)) {
194                 struct ethtool_cmd cmd;
195                 if (!__ethtool_get_settings(netdev, &cmd))
196                         ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
197         }
198         rtnl_unlock();
199         return ret;
200 }
201 static DEVICE_ATTR_RO(speed);
202 
203 static ssize_t duplex_show(struct device *dev,
204                            struct device_attribute *attr, char *buf)
205 {
206         struct net_device *netdev = to_net_dev(dev);
207         int ret = -EINVAL;
208 
209         if (!rtnl_trylock())
210                 return restart_syscall();
211 
212         if (netif_running(netdev)) {
213                 struct ethtool_cmd cmd;
214                 if (!__ethtool_get_settings(netdev, &cmd)) {
215                         const char *duplex;
216                         switch (cmd.duplex) {
217                         case DUPLEX_HALF:
218                                 duplex = "half";
219                                 break;
220                         case DUPLEX_FULL:
221                                 duplex = "full";
222                                 break;
223                         default:
224                                 duplex = "unknown";
225                                 break;
226                         }
227                         ret = sprintf(buf, "%s\n", duplex);
228                 }
229         }
230         rtnl_unlock();
231         return ret;
232 }
233 static DEVICE_ATTR_RO(duplex);
234 
235 static ssize_t dormant_show(struct device *dev,
236                             struct device_attribute *attr, char *buf)
237 {
238         struct net_device *netdev = to_net_dev(dev);
239 
240         if (netif_running(netdev))
241                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
242 
243         return -EINVAL;
244 }
245 static DEVICE_ATTR_RO(dormant);
246 
247 static const char *const operstates[] = {
248         "unknown",
249         "notpresent", /* currently unused */
250         "down",
251         "lowerlayerdown",
252         "testing", /* currently unused */
253         "dormant",
254         "up"
255 };
256 
257 static ssize_t operstate_show(struct device *dev,
258                               struct device_attribute *attr, char *buf)
259 {
260         const struct net_device *netdev = to_net_dev(dev);
261         unsigned char operstate;
262 
263         read_lock(&dev_base_lock);
264         operstate = netdev->operstate;
265         if (!netif_running(netdev))
266                 operstate = IF_OPER_DOWN;
267         read_unlock(&dev_base_lock);
268 
269         if (operstate >= ARRAY_SIZE(operstates))
270                 return -EINVAL; /* should not happen */
271 
272         return sprintf(buf, "%s\n", operstates[operstate]);
273 }
274 static DEVICE_ATTR_RO(operstate);
275 
276 static ssize_t carrier_changes_show(struct device *dev,
277                                     struct device_attribute *attr,
278                                     char *buf)
279 {
280         struct net_device *netdev = to_net_dev(dev);
281         return sprintf(buf, fmt_dec,
282                        atomic_read(&netdev->carrier_changes));
283 }
284 static DEVICE_ATTR_RO(carrier_changes);
285 
286 /* read-write attributes */
287 
288 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
289 {
290         return dev_set_mtu(dev, (int) new_mtu);
291 }
292 
293 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
294                          const char *buf, size_t len)
295 {
296         return netdev_store(dev, attr, buf, len, change_mtu);
297 }
298 NETDEVICE_SHOW_RW(mtu, fmt_dec);
299 
300 static int change_flags(struct net_device *dev, unsigned long new_flags)
301 {
302         return dev_change_flags(dev, (unsigned int) new_flags);
303 }
304 
305 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
306                            const char *buf, size_t len)
307 {
308         return netdev_store(dev, attr, buf, len, change_flags);
309 }
310 NETDEVICE_SHOW_RW(flags, fmt_hex);
311 
312 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
313 {
314         dev->tx_queue_len = new_len;
315         return 0;
316 }
317 
318 static ssize_t tx_queue_len_store(struct device *dev,
319                                   struct device_attribute *attr,
320                                   const char *buf, size_t len)
321 {
322         if (!capable(CAP_NET_ADMIN))
323                 return -EPERM;
324 
325         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
326 }
327 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
328 
329 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
330 {
331         dev->gro_flush_timeout = val;
332         return 0;
333 }
334 
335 static ssize_t gro_flush_timeout_store(struct device *dev,
336                                   struct device_attribute *attr,
337                                   const char *buf, size_t len)
338 {
339         if (!capable(CAP_NET_ADMIN))
340                 return -EPERM;
341 
342         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
343 }
344 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
345 
346 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
347                              const char *buf, size_t len)
348 {
349         struct net_device *netdev = to_net_dev(dev);
350         struct net *net = dev_net(netdev);
351         size_t count = len;
352         ssize_t ret;
353 
354         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
355                 return -EPERM;
356 
357         /* ignore trailing newline */
358         if (len >  0 && buf[len - 1] == '\n')
359                 --count;
360 
361         if (!rtnl_trylock())
362                 return restart_syscall();
363         ret = dev_set_alias(netdev, buf, count);
364         rtnl_unlock();
365 
366         return ret < 0 ? ret : len;
367 }
368 
369 static ssize_t ifalias_show(struct device *dev,
370                             struct device_attribute *attr, char *buf)
371 {
372         const struct net_device *netdev = to_net_dev(dev);
373         ssize_t ret = 0;
374 
375         if (!rtnl_trylock())
376                 return restart_syscall();
377         if (netdev->ifalias)
378                 ret = sprintf(buf, "%s\n", netdev->ifalias);
379         rtnl_unlock();
380         return ret;
381 }
382 static DEVICE_ATTR_RW(ifalias);
383 
384 static int change_group(struct net_device *dev, unsigned long new_group)
385 {
386         dev_set_group(dev, (int) new_group);
387         return 0;
388 }
389 
390 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
391                            const char *buf, size_t len)
392 {
393         return netdev_store(dev, attr, buf, len, change_group);
394 }
395 NETDEVICE_SHOW(group, fmt_dec);
396 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
397 
398 static ssize_t phys_port_id_show(struct device *dev,
399                                  struct device_attribute *attr, char *buf)
400 {
401         struct net_device *netdev = to_net_dev(dev);
402         ssize_t ret = -EINVAL;
403 
404         if (!rtnl_trylock())
405                 return restart_syscall();
406 
407         if (dev_isalive(netdev)) {
408                 struct netdev_phys_item_id ppid;
409 
410                 ret = dev_get_phys_port_id(netdev, &ppid);
411                 if (!ret)
412                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
413         }
414         rtnl_unlock();
415 
416         return ret;
417 }
418 static DEVICE_ATTR_RO(phys_port_id);
419 
420 static ssize_t phys_switch_id_show(struct device *dev,
421                                    struct device_attribute *attr, char *buf)
422 {
423         struct net_device *netdev = to_net_dev(dev);
424         ssize_t ret = -EINVAL;
425 
426         if (!rtnl_trylock())
427                 return restart_syscall();
428 
429         if (dev_isalive(netdev)) {
430                 struct netdev_phys_item_id ppid;
431 
432                 ret = netdev_switch_parent_id_get(netdev, &ppid);
433                 if (!ret)
434                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
435         }
436         rtnl_unlock();
437 
438         return ret;
439 }
440 static DEVICE_ATTR_RO(phys_switch_id);
441 
442 static struct attribute *net_class_attrs[] = {
443         &dev_attr_netdev_group.attr,
444         &dev_attr_type.attr,
445         &dev_attr_dev_id.attr,
446         &dev_attr_dev_port.attr,
447         &dev_attr_iflink.attr,
448         &dev_attr_ifindex.attr,
449         &dev_attr_name_assign_type.attr,
450         &dev_attr_addr_assign_type.attr,
451         &dev_attr_addr_len.attr,
452         &dev_attr_link_mode.attr,
453         &dev_attr_address.attr,
454         &dev_attr_broadcast.attr,
455         &dev_attr_speed.attr,
456         &dev_attr_duplex.attr,
457         &dev_attr_dormant.attr,
458         &dev_attr_operstate.attr,
459         &dev_attr_carrier_changes.attr,
460         &dev_attr_ifalias.attr,
461         &dev_attr_carrier.attr,
462         &dev_attr_mtu.attr,
463         &dev_attr_flags.attr,
464         &dev_attr_tx_queue_len.attr,
465         &dev_attr_gro_flush_timeout.attr,
466         &dev_attr_phys_port_id.attr,
467         &dev_attr_phys_switch_id.attr,
468         NULL,
469 };
470 ATTRIBUTE_GROUPS(net_class);
471 
472 /* Show a given an attribute in the statistics group */
473 static ssize_t netstat_show(const struct device *d,
474                             struct device_attribute *attr, char *buf,
475                             unsigned long offset)
476 {
477         struct net_device *dev = to_net_dev(d);
478         ssize_t ret = -EINVAL;
479 
480         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
481                         offset % sizeof(u64) != 0);
482 
483         read_lock(&dev_base_lock);
484         if (dev_isalive(dev)) {
485                 struct rtnl_link_stats64 temp;
486                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
487 
488                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
489         }
490         read_unlock(&dev_base_lock);
491         return ret;
492 }
493 
494 /* generate a read-only statistics attribute */
495 #define NETSTAT_ENTRY(name)                                             \
496 static ssize_t name##_show(struct device *d,                            \
497                            struct device_attribute *attr, char *buf)    \
498 {                                                                       \
499         return netstat_show(d, attr, buf,                               \
500                             offsetof(struct rtnl_link_stats64, name));  \
501 }                                                                       \
502 static DEVICE_ATTR_RO(name)
503 
504 NETSTAT_ENTRY(rx_packets);
505 NETSTAT_ENTRY(tx_packets);
506 NETSTAT_ENTRY(rx_bytes);
507 NETSTAT_ENTRY(tx_bytes);
508 NETSTAT_ENTRY(rx_errors);
509 NETSTAT_ENTRY(tx_errors);
510 NETSTAT_ENTRY(rx_dropped);
511 NETSTAT_ENTRY(tx_dropped);
512 NETSTAT_ENTRY(multicast);
513 NETSTAT_ENTRY(collisions);
514 NETSTAT_ENTRY(rx_length_errors);
515 NETSTAT_ENTRY(rx_over_errors);
516 NETSTAT_ENTRY(rx_crc_errors);
517 NETSTAT_ENTRY(rx_frame_errors);
518 NETSTAT_ENTRY(rx_fifo_errors);
519 NETSTAT_ENTRY(rx_missed_errors);
520 NETSTAT_ENTRY(tx_aborted_errors);
521 NETSTAT_ENTRY(tx_carrier_errors);
522 NETSTAT_ENTRY(tx_fifo_errors);
523 NETSTAT_ENTRY(tx_heartbeat_errors);
524 NETSTAT_ENTRY(tx_window_errors);
525 NETSTAT_ENTRY(rx_compressed);
526 NETSTAT_ENTRY(tx_compressed);
527 
528 static struct attribute *netstat_attrs[] = {
529         &dev_attr_rx_packets.attr,
530         &dev_attr_tx_packets.attr,
531         &dev_attr_rx_bytes.attr,
532         &dev_attr_tx_bytes.attr,
533         &dev_attr_rx_errors.attr,
534         &dev_attr_tx_errors.attr,
535         &dev_attr_rx_dropped.attr,
536         &dev_attr_tx_dropped.attr,
537         &dev_attr_multicast.attr,
538         &dev_attr_collisions.attr,
539         &dev_attr_rx_length_errors.attr,
540         &dev_attr_rx_over_errors.attr,
541         &dev_attr_rx_crc_errors.attr,
542         &dev_attr_rx_frame_errors.attr,
543         &dev_attr_rx_fifo_errors.attr,
544         &dev_attr_rx_missed_errors.attr,
545         &dev_attr_tx_aborted_errors.attr,
546         &dev_attr_tx_carrier_errors.attr,
547         &dev_attr_tx_fifo_errors.attr,
548         &dev_attr_tx_heartbeat_errors.attr,
549         &dev_attr_tx_window_errors.attr,
550         &dev_attr_rx_compressed.attr,
551         &dev_attr_tx_compressed.attr,
552         NULL
553 };
554 
555 
556 static struct attribute_group netstat_group = {
557         .name  = "statistics",
558         .attrs  = netstat_attrs,
559 };
560 
561 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
562 static struct attribute *wireless_attrs[] = {
563         NULL
564 };
565 
566 static struct attribute_group wireless_group = {
567         .name = "wireless",
568         .attrs = wireless_attrs,
569 };
570 #endif
571 
572 #else /* CONFIG_SYSFS */
573 #define net_class_groups        NULL
574 #endif /* CONFIG_SYSFS */
575 
576 #ifdef CONFIG_SYSFS
577 #define to_rx_queue_attr(_attr) container_of(_attr,             \
578     struct rx_queue_attribute, attr)
579 
580 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
581 
582 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
583                                   char *buf)
584 {
585         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
586         struct netdev_rx_queue *queue = to_rx_queue(kobj);
587 
588         if (!attribute->show)
589                 return -EIO;
590 
591         return attribute->show(queue, attribute, buf);
592 }
593 
594 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
595                                    const char *buf, size_t count)
596 {
597         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
598         struct netdev_rx_queue *queue = to_rx_queue(kobj);
599 
600         if (!attribute->store)
601                 return -EIO;
602 
603         return attribute->store(queue, attribute, buf, count);
604 }
605 
606 static const struct sysfs_ops rx_queue_sysfs_ops = {
607         .show = rx_queue_attr_show,
608         .store = rx_queue_attr_store,
609 };
610 
611 #ifdef CONFIG_RPS
612 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
613                             struct rx_queue_attribute *attribute, char *buf)
614 {
615         struct rps_map *map;
616         cpumask_var_t mask;
617         int i, len;
618 
619         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
620                 return -ENOMEM;
621 
622         rcu_read_lock();
623         map = rcu_dereference(queue->rps_map);
624         if (map)
625                 for (i = 0; i < map->len; i++)
626                         cpumask_set_cpu(map->cpus[i], mask);
627 
628         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
629         rcu_read_unlock();
630         free_cpumask_var(mask);
631 
632         return len < PAGE_SIZE ? len : -EINVAL;
633 }
634 
635 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
636                       struct rx_queue_attribute *attribute,
637                       const char *buf, size_t len)
638 {
639         struct rps_map *old_map, *map;
640         cpumask_var_t mask;
641         int err, cpu, i;
642         static DEFINE_SPINLOCK(rps_map_lock);
643 
644         if (!capable(CAP_NET_ADMIN))
645                 return -EPERM;
646 
647         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
648                 return -ENOMEM;
649 
650         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
651         if (err) {
652                 free_cpumask_var(mask);
653                 return err;
654         }
655 
656         map = kzalloc(max_t(unsigned int,
657             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
658             GFP_KERNEL);
659         if (!map) {
660                 free_cpumask_var(mask);
661                 return -ENOMEM;
662         }
663 
664         i = 0;
665         for_each_cpu_and(cpu, mask, cpu_online_mask)
666                 map->cpus[i++] = cpu;
667 
668         if (i)
669                 map->len = i;
670         else {
671                 kfree(map);
672                 map = NULL;
673         }
674 
675         spin_lock(&rps_map_lock);
676         old_map = rcu_dereference_protected(queue->rps_map,
677                                             lockdep_is_held(&rps_map_lock));
678         rcu_assign_pointer(queue->rps_map, map);
679         spin_unlock(&rps_map_lock);
680 
681         if (map)
682                 static_key_slow_inc(&rps_needed);
683         if (old_map) {
684                 kfree_rcu(old_map, rcu);
685                 static_key_slow_dec(&rps_needed);
686         }
687         free_cpumask_var(mask);
688         return len;
689 }
690 
691 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
692                                            struct rx_queue_attribute *attr,
693                                            char *buf)
694 {
695         struct rps_dev_flow_table *flow_table;
696         unsigned long val = 0;
697 
698         rcu_read_lock();
699         flow_table = rcu_dereference(queue->rps_flow_table);
700         if (flow_table)
701                 val = (unsigned long)flow_table->mask + 1;
702         rcu_read_unlock();
703 
704         return sprintf(buf, "%lu\n", val);
705 }
706 
707 static void rps_dev_flow_table_release(struct rcu_head *rcu)
708 {
709         struct rps_dev_flow_table *table = container_of(rcu,
710             struct rps_dev_flow_table, rcu);
711         vfree(table);
712 }
713 
714 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
715                                      struct rx_queue_attribute *attr,
716                                      const char *buf, size_t len)
717 {
718         unsigned long mask, count;
719         struct rps_dev_flow_table *table, *old_table;
720         static DEFINE_SPINLOCK(rps_dev_flow_lock);
721         int rc;
722 
723         if (!capable(CAP_NET_ADMIN))
724                 return -EPERM;
725 
726         rc = kstrtoul(buf, 0, &count);
727         if (rc < 0)
728                 return rc;
729 
730         if (count) {
731                 mask = count - 1;
732                 /* mask = roundup_pow_of_two(count) - 1;
733                  * without overflows...
734                  */
735                 while ((mask | (mask >> 1)) != mask)
736                         mask |= (mask >> 1);
737                 /* On 64 bit arches, must check mask fits in table->mask (u32),
738                  * and on 32bit arches, must check
739                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
740                  */
741 #if BITS_PER_LONG > 32
742                 if (mask > (unsigned long)(u32)mask)
743                         return -EINVAL;
744 #else
745                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
746                                 / sizeof(struct rps_dev_flow)) {
747                         /* Enforce a limit to prevent overflow */
748                         return -EINVAL;
749                 }
750 #endif
751                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
752                 if (!table)
753                         return -ENOMEM;
754 
755                 table->mask = mask;
756                 for (count = 0; count <= mask; count++)
757                         table->flows[count].cpu = RPS_NO_CPU;
758         } else
759                 table = NULL;
760 
761         spin_lock(&rps_dev_flow_lock);
762         old_table = rcu_dereference_protected(queue->rps_flow_table,
763                                               lockdep_is_held(&rps_dev_flow_lock));
764         rcu_assign_pointer(queue->rps_flow_table, table);
765         spin_unlock(&rps_dev_flow_lock);
766 
767         if (old_table)
768                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
769 
770         return len;
771 }
772 
773 static struct rx_queue_attribute rps_cpus_attribute =
774         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
775 
776 
777 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
778         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
779             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
780 #endif /* CONFIG_RPS */
781 
782 static struct attribute *rx_queue_default_attrs[] = {
783 #ifdef CONFIG_RPS
784         &rps_cpus_attribute.attr,
785         &rps_dev_flow_table_cnt_attribute.attr,
786 #endif
787         NULL
788 };
789 
790 static void rx_queue_release(struct kobject *kobj)
791 {
792         struct netdev_rx_queue *queue = to_rx_queue(kobj);
793 #ifdef CONFIG_RPS
794         struct rps_map *map;
795         struct rps_dev_flow_table *flow_table;
796 
797 
798         map = rcu_dereference_protected(queue->rps_map, 1);
799         if (map) {
800                 RCU_INIT_POINTER(queue->rps_map, NULL);
801                 kfree_rcu(map, rcu);
802         }
803 
804         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
805         if (flow_table) {
806                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
807                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
808         }
809 #endif
810 
811         memset(kobj, 0, sizeof(*kobj));
812         dev_put(queue->dev);
813 }
814 
815 static const void *rx_queue_namespace(struct kobject *kobj)
816 {
817         struct netdev_rx_queue *queue = to_rx_queue(kobj);
818         struct device *dev = &queue->dev->dev;
819         const void *ns = NULL;
820 
821         if (dev->class && dev->class->ns_type)
822                 ns = dev->class->namespace(dev);
823 
824         return ns;
825 }
826 
827 static struct kobj_type rx_queue_ktype = {
828         .sysfs_ops = &rx_queue_sysfs_ops,
829         .release = rx_queue_release,
830         .default_attrs = rx_queue_default_attrs,
831         .namespace = rx_queue_namespace
832 };
833 
834 static int rx_queue_add_kobject(struct net_device *dev, int index)
835 {
836         struct netdev_rx_queue *queue = dev->_rx + index;
837         struct kobject *kobj = &queue->kobj;
838         int error = 0;
839 
840         kobj->kset = dev->queues_kset;
841         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
842             "rx-%u", index);
843         if (error)
844                 goto exit;
845 
846         if (dev->sysfs_rx_queue_group) {
847                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
848                 if (error)
849                         goto exit;
850         }
851 
852         kobject_uevent(kobj, KOBJ_ADD);
853         dev_hold(queue->dev);
854 
855         return error;
856 exit:
857         kobject_put(kobj);
858         return error;
859 }
860 #endif /* CONFIG_SYSFS */
861 
862 int
863 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
864 {
865 #ifdef CONFIG_SYSFS
866         int i;
867         int error = 0;
868 
869 #ifndef CONFIG_RPS
870         if (!dev->sysfs_rx_queue_group)
871                 return 0;
872 #endif
873         for (i = old_num; i < new_num; i++) {
874                 error = rx_queue_add_kobject(dev, i);
875                 if (error) {
876                         new_num = old_num;
877                         break;
878                 }
879         }
880 
881         while (--i >= new_num) {
882                 if (dev->sysfs_rx_queue_group)
883                         sysfs_remove_group(&dev->_rx[i].kobj,
884                                            dev->sysfs_rx_queue_group);
885                 kobject_put(&dev->_rx[i].kobj);
886         }
887 
888         return error;
889 #else
890         return 0;
891 #endif
892 }
893 
894 #ifdef CONFIG_SYSFS
895 /*
896  * netdev_queue sysfs structures and functions.
897  */
898 struct netdev_queue_attribute {
899         struct attribute attr;
900         ssize_t (*show)(struct netdev_queue *queue,
901             struct netdev_queue_attribute *attr, char *buf);
902         ssize_t (*store)(struct netdev_queue *queue,
903             struct netdev_queue_attribute *attr, const char *buf, size_t len);
904 };
905 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
906     struct netdev_queue_attribute, attr)
907 
908 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
909 
910 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
911                                       struct attribute *attr, char *buf)
912 {
913         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
914         struct netdev_queue *queue = to_netdev_queue(kobj);
915 
916         if (!attribute->show)
917                 return -EIO;
918 
919         return attribute->show(queue, attribute, buf);
920 }
921 
922 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
923                                        struct attribute *attr,
924                                        const char *buf, size_t count)
925 {
926         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
927         struct netdev_queue *queue = to_netdev_queue(kobj);
928 
929         if (!attribute->store)
930                 return -EIO;
931 
932         return attribute->store(queue, attribute, buf, count);
933 }
934 
935 static const struct sysfs_ops netdev_queue_sysfs_ops = {
936         .show = netdev_queue_attr_show,
937         .store = netdev_queue_attr_store,
938 };
939 
940 static ssize_t show_trans_timeout(struct netdev_queue *queue,
941                                   struct netdev_queue_attribute *attribute,
942                                   char *buf)
943 {
944         unsigned long trans_timeout;
945 
946         spin_lock_irq(&queue->_xmit_lock);
947         trans_timeout = queue->trans_timeout;
948         spin_unlock_irq(&queue->_xmit_lock);
949 
950         return sprintf(buf, "%lu", trans_timeout);
951 }
952 
953 static struct netdev_queue_attribute queue_trans_timeout =
954         __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
955 
956 #ifdef CONFIG_BQL
957 /*
958  * Byte queue limits sysfs structures and functions.
959  */
960 static ssize_t bql_show(char *buf, unsigned int value)
961 {
962         return sprintf(buf, "%u\n", value);
963 }
964 
965 static ssize_t bql_set(const char *buf, const size_t count,
966                        unsigned int *pvalue)
967 {
968         unsigned int value;
969         int err;
970 
971         if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
972                 value = DQL_MAX_LIMIT;
973         else {
974                 err = kstrtouint(buf, 10, &value);
975                 if (err < 0)
976                         return err;
977                 if (value > DQL_MAX_LIMIT)
978                         return -EINVAL;
979         }
980 
981         *pvalue = value;
982 
983         return count;
984 }
985 
986 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
987                                   struct netdev_queue_attribute *attr,
988                                   char *buf)
989 {
990         struct dql *dql = &queue->dql;
991 
992         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
993 }
994 
995 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
996                                  struct netdev_queue_attribute *attribute,
997                                  const char *buf, size_t len)
998 {
999         struct dql *dql = &queue->dql;
1000         unsigned int value;
1001         int err;
1002 
1003         err = kstrtouint(buf, 10, &value);
1004         if (err < 0)
1005                 return err;
1006 
1007         dql->slack_hold_time = msecs_to_jiffies(value);
1008 
1009         return len;
1010 }
1011 
1012 static struct netdev_queue_attribute bql_hold_time_attribute =
1013         __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
1014             bql_set_hold_time);
1015 
1016 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1017                                  struct netdev_queue_attribute *attr,
1018                                  char *buf)
1019 {
1020         struct dql *dql = &queue->dql;
1021 
1022         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1023 }
1024 
1025 static struct netdev_queue_attribute bql_inflight_attribute =
1026         __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1027 
1028 #define BQL_ATTR(NAME, FIELD)                                           \
1029 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1030                                  struct netdev_queue_attribute *attr,   \
1031                                  char *buf)                             \
1032 {                                                                       \
1033         return bql_show(buf, queue->dql.FIELD);                         \
1034 }                                                                       \
1035                                                                         \
1036 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1037                                 struct netdev_queue_attribute *attr,    \
1038                                 const char *buf, size_t len)            \
1039 {                                                                       \
1040         return bql_set(buf, len, &queue->dql.FIELD);                    \
1041 }                                                                       \
1042                                                                         \
1043 static struct netdev_queue_attribute bql_ ## NAME ## _attribute =       \
1044         __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME,              \
1045             bql_set_ ## NAME);
1046 
1047 BQL_ATTR(limit, limit)
1048 BQL_ATTR(limit_max, max_limit)
1049 BQL_ATTR(limit_min, min_limit)
1050 
1051 static struct attribute *dql_attrs[] = {
1052         &bql_limit_attribute.attr,
1053         &bql_limit_max_attribute.attr,
1054         &bql_limit_min_attribute.attr,
1055         &bql_hold_time_attribute.attr,
1056         &bql_inflight_attribute.attr,
1057         NULL
1058 };
1059 
1060 static struct attribute_group dql_group = {
1061         .name  = "byte_queue_limits",
1062         .attrs  = dql_attrs,
1063 };
1064 #endif /* CONFIG_BQL */
1065 
1066 #ifdef CONFIG_XPS
1067 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1068 {
1069         struct net_device *dev = queue->dev;
1070         unsigned int i;
1071 
1072         i = queue - dev->_tx;
1073         BUG_ON(i >= dev->num_tx_queues);
1074 
1075         return i;
1076 }
1077 
1078 
1079 static ssize_t show_xps_map(struct netdev_queue *queue,
1080                             struct netdev_queue_attribute *attribute, char *buf)
1081 {
1082         struct net_device *dev = queue->dev;
1083         struct xps_dev_maps *dev_maps;
1084         cpumask_var_t mask;
1085         unsigned long index;
1086         int i, len;
1087 
1088         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1089                 return -ENOMEM;
1090 
1091         index = get_netdev_queue_index(queue);
1092 
1093         rcu_read_lock();
1094         dev_maps = rcu_dereference(dev->xps_maps);
1095         if (dev_maps) {
1096                 for_each_possible_cpu(i) {
1097                         struct xps_map *map =
1098                             rcu_dereference(dev_maps->cpu_map[i]);
1099                         if (map) {
1100                                 int j;
1101                                 for (j = 0; j < map->len; j++) {
1102                                         if (map->queues[j] == index) {
1103                                                 cpumask_set_cpu(i, mask);
1104                                                 break;
1105                                         }
1106                                 }
1107                         }
1108                 }
1109         }
1110         rcu_read_unlock();
1111 
1112         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1113         free_cpumask_var(mask);
1114         return len < PAGE_SIZE ? len : -EINVAL;
1115 }
1116 
1117 static ssize_t store_xps_map(struct netdev_queue *queue,
1118                       struct netdev_queue_attribute *attribute,
1119                       const char *buf, size_t len)
1120 {
1121         struct net_device *dev = queue->dev;
1122         unsigned long index;
1123         cpumask_var_t mask;
1124         int err;
1125 
1126         if (!capable(CAP_NET_ADMIN))
1127                 return -EPERM;
1128 
1129         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1130                 return -ENOMEM;
1131 
1132         index = get_netdev_queue_index(queue);
1133 
1134         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1135         if (err) {
1136                 free_cpumask_var(mask);
1137                 return err;
1138         }
1139 
1140         err = netif_set_xps_queue(dev, mask, index);
1141 
1142         free_cpumask_var(mask);
1143 
1144         return err ? : len;
1145 }
1146 
1147 static struct netdev_queue_attribute xps_cpus_attribute =
1148     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1149 #endif /* CONFIG_XPS */
1150 
1151 static struct attribute *netdev_queue_default_attrs[] = {
1152         &queue_trans_timeout.attr,
1153 #ifdef CONFIG_XPS
1154         &xps_cpus_attribute.attr,
1155 #endif
1156         NULL
1157 };
1158 
1159 static void netdev_queue_release(struct kobject *kobj)
1160 {
1161         struct netdev_queue *queue = to_netdev_queue(kobj);
1162 
1163         memset(kobj, 0, sizeof(*kobj));
1164         dev_put(queue->dev);
1165 }
1166 
1167 static const void *netdev_queue_namespace(struct kobject *kobj)
1168 {
1169         struct netdev_queue *queue = to_netdev_queue(kobj);
1170         struct device *dev = &queue->dev->dev;
1171         const void *ns = NULL;
1172 
1173         if (dev->class && dev->class->ns_type)
1174                 ns = dev->class->namespace(dev);
1175 
1176         return ns;
1177 }
1178 
1179 static struct kobj_type netdev_queue_ktype = {
1180         .sysfs_ops = &netdev_queue_sysfs_ops,
1181         .release = netdev_queue_release,
1182         .default_attrs = netdev_queue_default_attrs,
1183         .namespace = netdev_queue_namespace,
1184 };
1185 
1186 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1187 {
1188         struct netdev_queue *queue = dev->_tx + index;
1189         struct kobject *kobj = &queue->kobj;
1190         int error = 0;
1191 
1192         kobj->kset = dev->queues_kset;
1193         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1194             "tx-%u", index);
1195         if (error)
1196                 goto exit;
1197 
1198 #ifdef CONFIG_BQL
1199         error = sysfs_create_group(kobj, &dql_group);
1200         if (error)
1201                 goto exit;
1202 #endif
1203 
1204         kobject_uevent(kobj, KOBJ_ADD);
1205         dev_hold(queue->dev);
1206 
1207         return 0;
1208 exit:
1209         kobject_put(kobj);
1210         return error;
1211 }
1212 #endif /* CONFIG_SYSFS */
1213 
1214 int
1215 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1216 {
1217 #ifdef CONFIG_SYSFS
1218         int i;
1219         int error = 0;
1220 
1221         for (i = old_num; i < new_num; i++) {
1222                 error = netdev_queue_add_kobject(dev, i);
1223                 if (error) {
1224                         new_num = old_num;
1225                         break;
1226                 }
1227         }
1228 
1229         while (--i >= new_num) {
1230                 struct netdev_queue *queue = dev->_tx + i;
1231 
1232 #ifdef CONFIG_BQL
1233                 sysfs_remove_group(&queue->kobj, &dql_group);
1234 #endif
1235                 kobject_put(&queue->kobj);
1236         }
1237 
1238         return error;
1239 #else
1240         return 0;
1241 #endif /* CONFIG_SYSFS */
1242 }
1243 
1244 static int register_queue_kobjects(struct net_device *dev)
1245 {
1246         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1247 
1248 #ifdef CONFIG_SYSFS
1249         dev->queues_kset = kset_create_and_add("queues",
1250             NULL, &dev->dev.kobj);
1251         if (!dev->queues_kset)
1252                 return -ENOMEM;
1253         real_rx = dev->real_num_rx_queues;
1254 #endif
1255         real_tx = dev->real_num_tx_queues;
1256 
1257         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1258         if (error)
1259                 goto error;
1260         rxq = real_rx;
1261 
1262         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1263         if (error)
1264                 goto error;
1265         txq = real_tx;
1266 
1267         return 0;
1268 
1269 error:
1270         netdev_queue_update_kobjects(dev, txq, 0);
1271         net_rx_queue_update_kobjects(dev, rxq, 0);
1272         return error;
1273 }
1274 
1275 static void remove_queue_kobjects(struct net_device *dev)
1276 {
1277         int real_rx = 0, real_tx = 0;
1278 
1279 #ifdef CONFIG_SYSFS
1280         real_rx = dev->real_num_rx_queues;
1281 #endif
1282         real_tx = dev->real_num_tx_queues;
1283 
1284         net_rx_queue_update_kobjects(dev, real_rx, 0);
1285         netdev_queue_update_kobjects(dev, real_tx, 0);
1286 #ifdef CONFIG_SYSFS
1287         kset_unregister(dev->queues_kset);
1288 #endif
1289 }
1290 
1291 static bool net_current_may_mount(void)
1292 {
1293         struct net *net = current->nsproxy->net_ns;
1294 
1295         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1296 }
1297 
1298 static void *net_grab_current_ns(void)
1299 {
1300         struct net *ns = current->nsproxy->net_ns;
1301 #ifdef CONFIG_NET_NS
1302         if (ns)
1303                 atomic_inc(&ns->passive);
1304 #endif
1305         return ns;
1306 }
1307 
1308 static const void *net_initial_ns(void)
1309 {
1310         return &init_net;
1311 }
1312 
1313 static const void *net_netlink_ns(struct sock *sk)
1314 {
1315         return sock_net(sk);
1316 }
1317 
1318 struct kobj_ns_type_operations net_ns_type_operations = {
1319         .type = KOBJ_NS_TYPE_NET,
1320         .current_may_mount = net_current_may_mount,
1321         .grab_current_ns = net_grab_current_ns,
1322         .netlink_ns = net_netlink_ns,
1323         .initial_ns = net_initial_ns,
1324         .drop_ns = net_drop_ns,
1325 };
1326 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1327 
1328 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1329 {
1330         struct net_device *dev = to_net_dev(d);
1331         int retval;
1332 
1333         /* pass interface to uevent. */
1334         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1335         if (retval)
1336                 goto exit;
1337 
1338         /* pass ifindex to uevent.
1339          * ifindex is useful as it won't change (interface name may change)
1340          * and is what RtNetlink uses natively. */
1341         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1342 
1343 exit:
1344         return retval;
1345 }
1346 
1347 /*
1348  *      netdev_release -- destroy and free a dead device.
1349  *      Called when last reference to device kobject is gone.
1350  */
1351 static void netdev_release(struct device *d)
1352 {
1353         struct net_device *dev = to_net_dev(d);
1354 
1355         BUG_ON(dev->reg_state != NETREG_RELEASED);
1356 
1357         kfree(dev->ifalias);
1358         netdev_freemem(dev);
1359 }
1360 
1361 static const void *net_namespace(struct device *d)
1362 {
1363         struct net_device *dev;
1364         dev = container_of(d, struct net_device, dev);
1365         return dev_net(dev);
1366 }
1367 
1368 static struct class net_class = {
1369         .name = "net",
1370         .dev_release = netdev_release,
1371         .dev_groups = net_class_groups,
1372         .dev_uevent = netdev_uevent,
1373         .ns_type = &net_ns_type_operations,
1374         .namespace = net_namespace,
1375 };
1376 
1377 /* Delete sysfs entries but hold kobject reference until after all
1378  * netdev references are gone.
1379  */
1380 void netdev_unregister_kobject(struct net_device *ndev)
1381 {
1382         struct device *dev = &(ndev->dev);
1383 
1384         kobject_get(&dev->kobj);
1385 
1386         remove_queue_kobjects(ndev);
1387 
1388         pm_runtime_set_memalloc_noio(dev, false);
1389 
1390         device_del(dev);
1391 }
1392 
1393 /* Create sysfs entries for network device. */
1394 int netdev_register_kobject(struct net_device *ndev)
1395 {
1396         struct device *dev = &(ndev->dev);
1397         const struct attribute_group **groups = ndev->sysfs_groups;
1398         int error = 0;
1399 
1400         device_initialize(dev);
1401         dev->class = &net_class;
1402         dev->platform_data = ndev;
1403         dev->groups = groups;
1404 
1405         dev_set_name(dev, "%s", ndev->name);
1406 
1407 #ifdef CONFIG_SYSFS
1408         /* Allow for a device specific group */
1409         if (*groups)
1410                 groups++;
1411 
1412         *groups++ = &netstat_group;
1413 
1414 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1415         if (ndev->ieee80211_ptr)
1416                 *groups++ = &wireless_group;
1417 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1418         else if (ndev->wireless_handlers)
1419                 *groups++ = &wireless_group;
1420 #endif
1421 #endif
1422 #endif /* CONFIG_SYSFS */
1423 
1424         error = device_add(dev);
1425         if (error)
1426                 return error;
1427 
1428         error = register_queue_kobjects(ndev);
1429         if (error) {
1430                 device_del(dev);
1431                 return error;
1432         }
1433 
1434         pm_runtime_set_memalloc_noio(dev, true);
1435 
1436         return error;
1437 }
1438 
1439 int netdev_class_create_file_ns(struct class_attribute *class_attr,
1440                                 const void *ns)
1441 {
1442         return class_create_file_ns(&net_class, class_attr, ns);
1443 }
1444 EXPORT_SYMBOL(netdev_class_create_file_ns);
1445 
1446 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1447                                  const void *ns)
1448 {
1449         class_remove_file_ns(&net_class, class_attr, ns);
1450 }
1451 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1452 
1453 int __init netdev_kobject_init(void)
1454 {
1455         kobj_ns_type_register(&net_ns_type_operations);
1456         return class_register(&net_class);
1457 }
1458 

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