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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 #include <linux/of.h>
 27 
 28 #include "net-sysfs.h"
 29 
 30 #ifdef CONFIG_SYSFS
 31 static const char fmt_hex[] = "%#x\n";
 32 static const char fmt_long_hex[] = "%#lx\n";
 33 static const char fmt_dec[] = "%d\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(ifindex, fmt_dec);
112 NETDEVICE_SHOW_RO(type, fmt_dec);
113 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
114 
115 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
116                            char *buf)
117 {
118         struct net_device *ndev = to_net_dev(dev);
119 
120         return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
121 }
122 static DEVICE_ATTR_RO(iflink);
123 
124 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
125 {
126         return sprintf(buf, fmt_dec, dev->name_assign_type);
127 }
128 
129 static ssize_t name_assign_type_show(struct device *dev,
130                                      struct device_attribute *attr,
131                                      char *buf)
132 {
133         struct net_device *ndev = to_net_dev(dev);
134         ssize_t ret = -EINVAL;
135 
136         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
137                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
138 
139         return ret;
140 }
141 static DEVICE_ATTR_RO(name_assign_type);
142 
143 /* use same locking rules as GIFHWADDR ioctl's */
144 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
145                             char *buf)
146 {
147         struct net_device *ndev = to_net_dev(dev);
148         ssize_t ret = -EINVAL;
149 
150         read_lock(&dev_base_lock);
151         if (dev_isalive(ndev))
152                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
153         read_unlock(&dev_base_lock);
154         return ret;
155 }
156 static DEVICE_ATTR_RO(address);
157 
158 static ssize_t broadcast_show(struct device *dev,
159                               struct device_attribute *attr, char *buf)
160 {
161         struct net_device *ndev = to_net_dev(dev);
162         if (dev_isalive(ndev))
163                 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
164         return -EINVAL;
165 }
166 static DEVICE_ATTR_RO(broadcast);
167 
168 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
169 {
170         if (!netif_running(dev))
171                 return -EINVAL;
172         return dev_change_carrier(dev, (bool) new_carrier);
173 }
174 
175 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
176                              const char *buf, size_t len)
177 {
178         return netdev_store(dev, attr, buf, len, change_carrier);
179 }
180 
181 static ssize_t carrier_show(struct device *dev,
182                             struct device_attribute *attr, char *buf)
183 {
184         struct net_device *netdev = to_net_dev(dev);
185         if (netif_running(netdev)) {
186                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
187         }
188         return -EINVAL;
189 }
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_cmd cmd;
203                 if (!__ethtool_get_settings(netdev, &cmd))
204                         ret = sprintf(buf, fmt_dec, ethtool_cmd_speed(&cmd));
205         }
206         rtnl_unlock();
207         return ret;
208 }
209 static DEVICE_ATTR_RO(speed);
210 
211 static ssize_t duplex_show(struct device *dev,
212                            struct device_attribute *attr, char *buf)
213 {
214         struct net_device *netdev = to_net_dev(dev);
215         int ret = -EINVAL;
216 
217         if (!rtnl_trylock())
218                 return restart_syscall();
219 
220         if (netif_running(netdev)) {
221                 struct ethtool_cmd cmd;
222                 if (!__ethtool_get_settings(netdev, &cmd)) {
223                         const char *duplex;
224                         switch (cmd.duplex) {
225                         case DUPLEX_HALF:
226                                 duplex = "half";
227                                 break;
228                         case DUPLEX_FULL:
229                                 duplex = "full";
230                                 break;
231                         default:
232                                 duplex = "unknown";
233                                 break;
234                         }
235                         ret = sprintf(buf, "%s\n", duplex);
236                 }
237         }
238         rtnl_unlock();
239         return ret;
240 }
241 static DEVICE_ATTR_RO(duplex);
242 
243 static ssize_t dormant_show(struct device *dev,
244                             struct device_attribute *attr, char *buf)
245 {
246         struct net_device *netdev = to_net_dev(dev);
247 
248         if (netif_running(netdev))
249                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
250 
251         return -EINVAL;
252 }
253 static DEVICE_ATTR_RO(dormant);
254 
255 static const char *const operstates[] = {
256         "unknown",
257         "notpresent", /* currently unused */
258         "down",
259         "lowerlayerdown",
260         "testing", /* currently unused */
261         "dormant",
262         "up"
263 };
264 
265 static ssize_t operstate_show(struct device *dev,
266                               struct device_attribute *attr, char *buf)
267 {
268         const struct net_device *netdev = to_net_dev(dev);
269         unsigned char operstate;
270 
271         read_lock(&dev_base_lock);
272         operstate = netdev->operstate;
273         if (!netif_running(netdev))
274                 operstate = IF_OPER_DOWN;
275         read_unlock(&dev_base_lock);
276 
277         if (operstate >= ARRAY_SIZE(operstates))
278                 return -EINVAL; /* should not happen */
279 
280         return sprintf(buf, "%s\n", operstates[operstate]);
281 }
282 static DEVICE_ATTR_RO(operstate);
283 
284 static ssize_t carrier_changes_show(struct device *dev,
285                                     struct device_attribute *attr,
286                                     char *buf)
287 {
288         struct net_device *netdev = to_net_dev(dev);
289         return sprintf(buf, fmt_dec,
290                        atomic_read(&netdev->carrier_changes));
291 }
292 static DEVICE_ATTR_RO(carrier_changes);
293 
294 /* read-write attributes */
295 
296 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
297 {
298         return dev_set_mtu(dev, (int) new_mtu);
299 }
300 
301 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
302                          const char *buf, size_t len)
303 {
304         return netdev_store(dev, attr, buf, len, change_mtu);
305 }
306 NETDEVICE_SHOW_RW(mtu, fmt_dec);
307 
308 static int change_flags(struct net_device *dev, unsigned long new_flags)
309 {
310         return dev_change_flags(dev, (unsigned int) new_flags);
311 }
312 
313 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
314                            const char *buf, size_t len)
315 {
316         return netdev_store(dev, attr, buf, len, change_flags);
317 }
318 NETDEVICE_SHOW_RW(flags, fmt_hex);
319 
320 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
321 {
322         dev->tx_queue_len = new_len;
323         return 0;
324 }
325 
326 static ssize_t tx_queue_len_store(struct device *dev,
327                                   struct device_attribute *attr,
328                                   const char *buf, size_t len)
329 {
330         if (!capable(CAP_NET_ADMIN))
331                 return -EPERM;
332 
333         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
334 }
335 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
336 
337 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
338 {
339         dev->gro_flush_timeout = val;
340         return 0;
341 }
342 
343 static ssize_t gro_flush_timeout_store(struct device *dev,
344                                   struct device_attribute *attr,
345                                   const char *buf, size_t len)
346 {
347         if (!capable(CAP_NET_ADMIN))
348                 return -EPERM;
349 
350         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
351 }
352 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
353 
354 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
355                              const char *buf, size_t len)
356 {
357         struct net_device *netdev = to_net_dev(dev);
358         struct net *net = dev_net(netdev);
359         size_t count = len;
360         ssize_t ret;
361 
362         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
363                 return -EPERM;
364 
365         /* ignore trailing newline */
366         if (len >  0 && buf[len - 1] == '\n')
367                 --count;
368 
369         if (!rtnl_trylock())
370                 return restart_syscall();
371         ret = dev_set_alias(netdev, buf, count);
372         rtnl_unlock();
373 
374         return ret < 0 ? ret : len;
375 }
376 
377 static ssize_t ifalias_show(struct device *dev,
378                             struct device_attribute *attr, char *buf)
379 {
380         const struct net_device *netdev = to_net_dev(dev);
381         ssize_t ret = 0;
382 
383         if (!rtnl_trylock())
384                 return restart_syscall();
385         if (netdev->ifalias)
386                 ret = sprintf(buf, "%s\n", netdev->ifalias);
387         rtnl_unlock();
388         return ret;
389 }
390 static DEVICE_ATTR_RW(ifalias);
391 
392 static int change_group(struct net_device *dev, unsigned long new_group)
393 {
394         dev_set_group(dev, (int) new_group);
395         return 0;
396 }
397 
398 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
399                            const char *buf, size_t len)
400 {
401         return netdev_store(dev, attr, buf, len, change_group);
402 }
403 NETDEVICE_SHOW(group, fmt_dec);
404 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
405 
406 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
407 {
408         return dev_change_proto_down(dev, (bool) proto_down);
409 }
410 
411 static ssize_t proto_down_store(struct device *dev,
412                                 struct device_attribute *attr,
413                                 const char *buf, size_t len)
414 {
415         return netdev_store(dev, attr, buf, len, change_proto_down);
416 }
417 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
418 
419 static ssize_t phys_port_id_show(struct device *dev,
420                                  struct device_attribute *attr, char *buf)
421 {
422         struct net_device *netdev = to_net_dev(dev);
423         ssize_t ret = -EINVAL;
424 
425         if (!rtnl_trylock())
426                 return restart_syscall();
427 
428         if (dev_isalive(netdev)) {
429                 struct netdev_phys_item_id ppid;
430 
431                 ret = dev_get_phys_port_id(netdev, &ppid);
432                 if (!ret)
433                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
434         }
435         rtnl_unlock();
436 
437         return ret;
438 }
439 static DEVICE_ATTR_RO(phys_port_id);
440 
441 static ssize_t phys_port_name_show(struct device *dev,
442                                    struct device_attribute *attr, char *buf)
443 {
444         struct net_device *netdev = to_net_dev(dev);
445         ssize_t ret = -EINVAL;
446 
447         if (!rtnl_trylock())
448                 return restart_syscall();
449 
450         if (dev_isalive(netdev)) {
451                 char name[IFNAMSIZ];
452 
453                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
454                 if (!ret)
455                         ret = sprintf(buf, "%s\n", name);
456         }
457         rtnl_unlock();
458 
459         return ret;
460 }
461 static DEVICE_ATTR_RO(phys_port_name);
462 
463 static ssize_t phys_switch_id_show(struct device *dev,
464                                    struct device_attribute *attr, char *buf)
465 {
466         struct net_device *netdev = to_net_dev(dev);
467         ssize_t ret = -EINVAL;
468 
469         if (!rtnl_trylock())
470                 return restart_syscall();
471 
472         if (dev_isalive(netdev)) {
473                 struct switchdev_attr attr = {
474                         .orig_dev = netdev,
475                         .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
476                         .flags = SWITCHDEV_F_NO_RECURSE,
477                 };
478 
479                 ret = switchdev_port_attr_get(netdev, &attr);
480                 if (!ret)
481                         ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
482                                       attr.u.ppid.id);
483         }
484         rtnl_unlock();
485 
486         return ret;
487 }
488 static DEVICE_ATTR_RO(phys_switch_id);
489 
490 static struct attribute *net_class_attrs[] = {
491         &dev_attr_netdev_group.attr,
492         &dev_attr_type.attr,
493         &dev_attr_dev_id.attr,
494         &dev_attr_dev_port.attr,
495         &dev_attr_iflink.attr,
496         &dev_attr_ifindex.attr,
497         &dev_attr_name_assign_type.attr,
498         &dev_attr_addr_assign_type.attr,
499         &dev_attr_addr_len.attr,
500         &dev_attr_link_mode.attr,
501         &dev_attr_address.attr,
502         &dev_attr_broadcast.attr,
503         &dev_attr_speed.attr,
504         &dev_attr_duplex.attr,
505         &dev_attr_dormant.attr,
506         &dev_attr_operstate.attr,
507         &dev_attr_carrier_changes.attr,
508         &dev_attr_ifalias.attr,
509         &dev_attr_carrier.attr,
510         &dev_attr_mtu.attr,
511         &dev_attr_flags.attr,
512         &dev_attr_tx_queue_len.attr,
513         &dev_attr_gro_flush_timeout.attr,
514         &dev_attr_phys_port_id.attr,
515         &dev_attr_phys_port_name.attr,
516         &dev_attr_phys_switch_id.attr,
517         &dev_attr_proto_down.attr,
518         NULL,
519 };
520 ATTRIBUTE_GROUPS(net_class);
521 
522 /* Show a given an attribute in the statistics group */
523 static ssize_t netstat_show(const struct device *d,
524                             struct device_attribute *attr, char *buf,
525                             unsigned long offset)
526 {
527         struct net_device *dev = to_net_dev(d);
528         ssize_t ret = -EINVAL;
529 
530         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
531                         offset % sizeof(u64) != 0);
532 
533         read_lock(&dev_base_lock);
534         if (dev_isalive(dev)) {
535                 struct rtnl_link_stats64 temp;
536                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
537 
538                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
539         }
540         read_unlock(&dev_base_lock);
541         return ret;
542 }
543 
544 /* generate a read-only statistics attribute */
545 #define NETSTAT_ENTRY(name)                                             \
546 static ssize_t name##_show(struct device *d,                            \
547                            struct device_attribute *attr, char *buf)    \
548 {                                                                       \
549         return netstat_show(d, attr, buf,                               \
550                             offsetof(struct rtnl_link_stats64, name));  \
551 }                                                                       \
552 static DEVICE_ATTR_RO(name)
553 
554 NETSTAT_ENTRY(rx_packets);
555 NETSTAT_ENTRY(tx_packets);
556 NETSTAT_ENTRY(rx_bytes);
557 NETSTAT_ENTRY(tx_bytes);
558 NETSTAT_ENTRY(rx_errors);
559 NETSTAT_ENTRY(tx_errors);
560 NETSTAT_ENTRY(rx_dropped);
561 NETSTAT_ENTRY(tx_dropped);
562 NETSTAT_ENTRY(multicast);
563 NETSTAT_ENTRY(collisions);
564 NETSTAT_ENTRY(rx_length_errors);
565 NETSTAT_ENTRY(rx_over_errors);
566 NETSTAT_ENTRY(rx_crc_errors);
567 NETSTAT_ENTRY(rx_frame_errors);
568 NETSTAT_ENTRY(rx_fifo_errors);
569 NETSTAT_ENTRY(rx_missed_errors);
570 NETSTAT_ENTRY(tx_aborted_errors);
571 NETSTAT_ENTRY(tx_carrier_errors);
572 NETSTAT_ENTRY(tx_fifo_errors);
573 NETSTAT_ENTRY(tx_heartbeat_errors);
574 NETSTAT_ENTRY(tx_window_errors);
575 NETSTAT_ENTRY(rx_compressed);
576 NETSTAT_ENTRY(tx_compressed);
577 
578 static struct attribute *netstat_attrs[] = {
579         &dev_attr_rx_packets.attr,
580         &dev_attr_tx_packets.attr,
581         &dev_attr_rx_bytes.attr,
582         &dev_attr_tx_bytes.attr,
583         &dev_attr_rx_errors.attr,
584         &dev_attr_tx_errors.attr,
585         &dev_attr_rx_dropped.attr,
586         &dev_attr_tx_dropped.attr,
587         &dev_attr_multicast.attr,
588         &dev_attr_collisions.attr,
589         &dev_attr_rx_length_errors.attr,
590         &dev_attr_rx_over_errors.attr,
591         &dev_attr_rx_crc_errors.attr,
592         &dev_attr_rx_frame_errors.attr,
593         &dev_attr_rx_fifo_errors.attr,
594         &dev_attr_rx_missed_errors.attr,
595         &dev_attr_tx_aborted_errors.attr,
596         &dev_attr_tx_carrier_errors.attr,
597         &dev_attr_tx_fifo_errors.attr,
598         &dev_attr_tx_heartbeat_errors.attr,
599         &dev_attr_tx_window_errors.attr,
600         &dev_attr_rx_compressed.attr,
601         &dev_attr_tx_compressed.attr,
602         NULL
603 };
604 
605 
606 static struct attribute_group netstat_group = {
607         .name  = "statistics",
608         .attrs  = netstat_attrs,
609 };
610 
611 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
612 static struct attribute *wireless_attrs[] = {
613         NULL
614 };
615 
616 static struct attribute_group wireless_group = {
617         .name = "wireless",
618         .attrs = wireless_attrs,
619 };
620 #endif
621 
622 #else /* CONFIG_SYSFS */
623 #define net_class_groups        NULL
624 #endif /* CONFIG_SYSFS */
625 
626 #ifdef CONFIG_SYSFS
627 #define to_rx_queue_attr(_attr) container_of(_attr,             \
628     struct rx_queue_attribute, attr)
629 
630 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
631 
632 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
633                                   char *buf)
634 {
635         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
636         struct netdev_rx_queue *queue = to_rx_queue(kobj);
637 
638         if (!attribute->show)
639                 return -EIO;
640 
641         return attribute->show(queue, attribute, buf);
642 }
643 
644 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
645                                    const char *buf, size_t count)
646 {
647         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
648         struct netdev_rx_queue *queue = to_rx_queue(kobj);
649 
650         if (!attribute->store)
651                 return -EIO;
652 
653         return attribute->store(queue, attribute, buf, count);
654 }
655 
656 static const struct sysfs_ops rx_queue_sysfs_ops = {
657         .show = rx_queue_attr_show,
658         .store = rx_queue_attr_store,
659 };
660 
661 #ifdef CONFIG_RPS
662 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
663                             struct rx_queue_attribute *attribute, char *buf)
664 {
665         struct rps_map *map;
666         cpumask_var_t mask;
667         int i, len;
668 
669         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
670                 return -ENOMEM;
671 
672         rcu_read_lock();
673         map = rcu_dereference(queue->rps_map);
674         if (map)
675                 for (i = 0; i < map->len; i++)
676                         cpumask_set_cpu(map->cpus[i], mask);
677 
678         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
679         rcu_read_unlock();
680         free_cpumask_var(mask);
681 
682         return len < PAGE_SIZE ? len : -EINVAL;
683 }
684 
685 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
686                       struct rx_queue_attribute *attribute,
687                       const char *buf, size_t len)
688 {
689         struct rps_map *old_map, *map;
690         cpumask_var_t mask;
691         int err, cpu, i;
692         static DEFINE_MUTEX(rps_map_mutex);
693 
694         if (!capable(CAP_NET_ADMIN))
695                 return -EPERM;
696 
697         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
698                 return -ENOMEM;
699 
700         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
701         if (err) {
702                 free_cpumask_var(mask);
703                 return err;
704         }
705 
706         map = kzalloc(max_t(unsigned int,
707             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
708             GFP_KERNEL);
709         if (!map) {
710                 free_cpumask_var(mask);
711                 return -ENOMEM;
712         }
713 
714         i = 0;
715         for_each_cpu_and(cpu, mask, cpu_online_mask)
716                 map->cpus[i++] = cpu;
717 
718         if (i)
719                 map->len = i;
720         else {
721                 kfree(map);
722                 map = NULL;
723         }
724 
725         mutex_lock(&rps_map_mutex);
726         old_map = rcu_dereference_protected(queue->rps_map,
727                                             mutex_is_locked(&rps_map_mutex));
728         rcu_assign_pointer(queue->rps_map, map);
729 
730         if (map)
731                 static_key_slow_inc(&rps_needed);
732         if (old_map)
733                 static_key_slow_dec(&rps_needed);
734 
735         mutex_unlock(&rps_map_mutex);
736 
737         if (old_map)
738                 kfree_rcu(old_map, rcu);
739 
740         free_cpumask_var(mask);
741         return len;
742 }
743 
744 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
745                                            struct rx_queue_attribute *attr,
746                                            char *buf)
747 {
748         struct rps_dev_flow_table *flow_table;
749         unsigned long val = 0;
750 
751         rcu_read_lock();
752         flow_table = rcu_dereference(queue->rps_flow_table);
753         if (flow_table)
754                 val = (unsigned long)flow_table->mask + 1;
755         rcu_read_unlock();
756 
757         return sprintf(buf, "%lu\n", val);
758 }
759 
760 static void rps_dev_flow_table_release(struct rcu_head *rcu)
761 {
762         struct rps_dev_flow_table *table = container_of(rcu,
763             struct rps_dev_flow_table, rcu);
764         vfree(table);
765 }
766 
767 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
768                                      struct rx_queue_attribute *attr,
769                                      const char *buf, size_t len)
770 {
771         unsigned long mask, count;
772         struct rps_dev_flow_table *table, *old_table;
773         static DEFINE_SPINLOCK(rps_dev_flow_lock);
774         int rc;
775 
776         if (!capable(CAP_NET_ADMIN))
777                 return -EPERM;
778 
779         rc = kstrtoul(buf, 0, &count);
780         if (rc < 0)
781                 return rc;
782 
783         if (count) {
784                 mask = count - 1;
785                 /* mask = roundup_pow_of_two(count) - 1;
786                  * without overflows...
787                  */
788                 while ((mask | (mask >> 1)) != mask)
789                         mask |= (mask >> 1);
790                 /* On 64 bit arches, must check mask fits in table->mask (u32),
791                  * and on 32bit arches, must check
792                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
793                  */
794 #if BITS_PER_LONG > 32
795                 if (mask > (unsigned long)(u32)mask)
796                         return -EINVAL;
797 #else
798                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
799                                 / sizeof(struct rps_dev_flow)) {
800                         /* Enforce a limit to prevent overflow */
801                         return -EINVAL;
802                 }
803 #endif
804                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
805                 if (!table)
806                         return -ENOMEM;
807 
808                 table->mask = mask;
809                 for (count = 0; count <= mask; count++)
810                         table->flows[count].cpu = RPS_NO_CPU;
811         } else
812                 table = NULL;
813 
814         spin_lock(&rps_dev_flow_lock);
815         old_table = rcu_dereference_protected(queue->rps_flow_table,
816                                               lockdep_is_held(&rps_dev_flow_lock));
817         rcu_assign_pointer(queue->rps_flow_table, table);
818         spin_unlock(&rps_dev_flow_lock);
819 
820         if (old_table)
821                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
822 
823         return len;
824 }
825 
826 static struct rx_queue_attribute rps_cpus_attribute =
827         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
828 
829 
830 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
831         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
832             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
833 #endif /* CONFIG_RPS */
834 
835 static struct attribute *rx_queue_default_attrs[] = {
836 #ifdef CONFIG_RPS
837         &rps_cpus_attribute.attr,
838         &rps_dev_flow_table_cnt_attribute.attr,
839 #endif
840         NULL
841 };
842 
843 static void rx_queue_release(struct kobject *kobj)
844 {
845         struct netdev_rx_queue *queue = to_rx_queue(kobj);
846 #ifdef CONFIG_RPS
847         struct rps_map *map;
848         struct rps_dev_flow_table *flow_table;
849 
850 
851         map = rcu_dereference_protected(queue->rps_map, 1);
852         if (map) {
853                 RCU_INIT_POINTER(queue->rps_map, NULL);
854                 kfree_rcu(map, rcu);
855         }
856 
857         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
858         if (flow_table) {
859                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
860                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
861         }
862 #endif
863 
864         memset(kobj, 0, sizeof(*kobj));
865         dev_put(queue->dev);
866 }
867 
868 static const void *rx_queue_namespace(struct kobject *kobj)
869 {
870         struct netdev_rx_queue *queue = to_rx_queue(kobj);
871         struct device *dev = &queue->dev->dev;
872         const void *ns = NULL;
873 
874         if (dev->class && dev->class->ns_type)
875                 ns = dev->class->namespace(dev);
876 
877         return ns;
878 }
879 
880 static struct kobj_type rx_queue_ktype = {
881         .sysfs_ops = &rx_queue_sysfs_ops,
882         .release = rx_queue_release,
883         .default_attrs = rx_queue_default_attrs,
884         .namespace = rx_queue_namespace
885 };
886 
887 static int rx_queue_add_kobject(struct net_device *dev, int index)
888 {
889         struct netdev_rx_queue *queue = dev->_rx + index;
890         struct kobject *kobj = &queue->kobj;
891         int error = 0;
892 
893         kobj->kset = dev->queues_kset;
894         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
895             "rx-%u", index);
896         if (error)
897                 goto exit;
898 
899         if (dev->sysfs_rx_queue_group) {
900                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
901                 if (error)
902                         goto exit;
903         }
904 
905         kobject_uevent(kobj, KOBJ_ADD);
906         dev_hold(queue->dev);
907 
908         return error;
909 exit:
910         kobject_put(kobj);
911         return error;
912 }
913 #endif /* CONFIG_SYSFS */
914 
915 int
916 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
917 {
918 #ifdef CONFIG_SYSFS
919         int i;
920         int error = 0;
921 
922 #ifndef CONFIG_RPS
923         if (!dev->sysfs_rx_queue_group)
924                 return 0;
925 #endif
926         for (i = old_num; i < new_num; i++) {
927                 error = rx_queue_add_kobject(dev, i);
928                 if (error) {
929                         new_num = old_num;
930                         break;
931                 }
932         }
933 
934         while (--i >= new_num) {
935                 if (dev->sysfs_rx_queue_group)
936                         sysfs_remove_group(&dev->_rx[i].kobj,
937                                            dev->sysfs_rx_queue_group);
938                 kobject_put(&dev->_rx[i].kobj);
939         }
940 
941         return error;
942 #else
943         return 0;
944 #endif
945 }
946 
947 #ifdef CONFIG_SYSFS
948 /*
949  * netdev_queue sysfs structures and functions.
950  */
951 struct netdev_queue_attribute {
952         struct attribute attr;
953         ssize_t (*show)(struct netdev_queue *queue,
954             struct netdev_queue_attribute *attr, char *buf);
955         ssize_t (*store)(struct netdev_queue *queue,
956             struct netdev_queue_attribute *attr, const char *buf, size_t len);
957 };
958 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
959     struct netdev_queue_attribute, attr)
960 
961 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
962 
963 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
964                                       struct attribute *attr, char *buf)
965 {
966         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
967         struct netdev_queue *queue = to_netdev_queue(kobj);
968 
969         if (!attribute->show)
970                 return -EIO;
971 
972         return attribute->show(queue, attribute, buf);
973 }
974 
975 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
976                                        struct attribute *attr,
977                                        const char *buf, size_t count)
978 {
979         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
980         struct netdev_queue *queue = to_netdev_queue(kobj);
981 
982         if (!attribute->store)
983                 return -EIO;
984 
985         return attribute->store(queue, attribute, buf, count);
986 }
987 
988 static const struct sysfs_ops netdev_queue_sysfs_ops = {
989         .show = netdev_queue_attr_show,
990         .store = netdev_queue_attr_store,
991 };
992 
993 static ssize_t show_trans_timeout(struct netdev_queue *queue,
994                                   struct netdev_queue_attribute *attribute,
995                                   char *buf)
996 {
997         unsigned long trans_timeout;
998 
999         spin_lock_irq(&queue->_xmit_lock);
1000         trans_timeout = queue->trans_timeout;
1001         spin_unlock_irq(&queue->_xmit_lock);
1002 
1003         return sprintf(buf, "%lu", trans_timeout);
1004 }
1005 
1006 #ifdef CONFIG_XPS
1007 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1008 {
1009         struct net_device *dev = queue->dev;
1010         unsigned int i;
1011 
1012         i = queue - dev->_tx;
1013         BUG_ON(i >= dev->num_tx_queues);
1014 
1015         return i;
1016 }
1017 
1018 static ssize_t show_tx_maxrate(struct netdev_queue *queue,
1019                                struct netdev_queue_attribute *attribute,
1020                                char *buf)
1021 {
1022         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1023 }
1024 
1025 static ssize_t set_tx_maxrate(struct netdev_queue *queue,
1026                               struct netdev_queue_attribute *attribute,
1027                               const char *buf, size_t len)
1028 {
1029         struct net_device *dev = queue->dev;
1030         int err, index = get_netdev_queue_index(queue);
1031         u32 rate = 0;
1032 
1033         err = kstrtou32(buf, 10, &rate);
1034         if (err < 0)
1035                 return err;
1036 
1037         if (!rtnl_trylock())
1038                 return restart_syscall();
1039 
1040         err = -EOPNOTSUPP;
1041         if (dev->netdev_ops->ndo_set_tx_maxrate)
1042                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1043 
1044         rtnl_unlock();
1045         if (!err) {
1046                 queue->tx_maxrate = rate;
1047                 return len;
1048         }
1049         return err;
1050 }
1051 
1052 static struct netdev_queue_attribute queue_tx_maxrate =
1053         __ATTR(tx_maxrate, S_IRUGO | S_IWUSR,
1054                show_tx_maxrate, set_tx_maxrate);
1055 #endif
1056 
1057 static struct netdev_queue_attribute queue_trans_timeout =
1058         __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
1059 
1060 #ifdef CONFIG_BQL
1061 /*
1062  * Byte queue limits sysfs structures and functions.
1063  */
1064 static ssize_t bql_show(char *buf, unsigned int value)
1065 {
1066         return sprintf(buf, "%u\n", value);
1067 }
1068 
1069 static ssize_t bql_set(const char *buf, const size_t count,
1070                        unsigned int *pvalue)
1071 {
1072         unsigned int value;
1073         int err;
1074 
1075         if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
1076                 value = DQL_MAX_LIMIT;
1077         else {
1078                 err = kstrtouint(buf, 10, &value);
1079                 if (err < 0)
1080                         return err;
1081                 if (value > DQL_MAX_LIMIT)
1082                         return -EINVAL;
1083         }
1084 
1085         *pvalue = value;
1086 
1087         return count;
1088 }
1089 
1090 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1091                                   struct netdev_queue_attribute *attr,
1092                                   char *buf)
1093 {
1094         struct dql *dql = &queue->dql;
1095 
1096         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1097 }
1098 
1099 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1100                                  struct netdev_queue_attribute *attribute,
1101                                  const char *buf, size_t len)
1102 {
1103         struct dql *dql = &queue->dql;
1104         unsigned int value;
1105         int err;
1106 
1107         err = kstrtouint(buf, 10, &value);
1108         if (err < 0)
1109                 return err;
1110 
1111         dql->slack_hold_time = msecs_to_jiffies(value);
1112 
1113         return len;
1114 }
1115 
1116 static struct netdev_queue_attribute bql_hold_time_attribute =
1117         __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
1118             bql_set_hold_time);
1119 
1120 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1121                                  struct netdev_queue_attribute *attr,
1122                                  char *buf)
1123 {
1124         struct dql *dql = &queue->dql;
1125 
1126         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1127 }
1128 
1129 static struct netdev_queue_attribute bql_inflight_attribute =
1130         __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1131 
1132 #define BQL_ATTR(NAME, FIELD)                                           \
1133 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1134                                  struct netdev_queue_attribute *attr,   \
1135                                  char *buf)                             \
1136 {                                                                       \
1137         return bql_show(buf, queue->dql.FIELD);                         \
1138 }                                                                       \
1139                                                                         \
1140 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1141                                 struct netdev_queue_attribute *attr,    \
1142                                 const char *buf, size_t len)            \
1143 {                                                                       \
1144         return bql_set(buf, len, &queue->dql.FIELD);                    \
1145 }                                                                       \
1146                                                                         \
1147 static struct netdev_queue_attribute bql_ ## NAME ## _attribute =       \
1148         __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME,              \
1149             bql_set_ ## NAME);
1150 
1151 BQL_ATTR(limit, limit)
1152 BQL_ATTR(limit_max, max_limit)
1153 BQL_ATTR(limit_min, min_limit)
1154 
1155 static struct attribute *dql_attrs[] = {
1156         &bql_limit_attribute.attr,
1157         &bql_limit_max_attribute.attr,
1158         &bql_limit_min_attribute.attr,
1159         &bql_hold_time_attribute.attr,
1160         &bql_inflight_attribute.attr,
1161         NULL
1162 };
1163 
1164 static struct attribute_group dql_group = {
1165         .name  = "byte_queue_limits",
1166         .attrs  = dql_attrs,
1167 };
1168 #endif /* CONFIG_BQL */
1169 
1170 #ifdef CONFIG_XPS
1171 static ssize_t show_xps_map(struct netdev_queue *queue,
1172                             struct netdev_queue_attribute *attribute, char *buf)
1173 {
1174         struct net_device *dev = queue->dev;
1175         struct xps_dev_maps *dev_maps;
1176         cpumask_var_t mask;
1177         unsigned long index;
1178         int i, len;
1179 
1180         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1181                 return -ENOMEM;
1182 
1183         index = get_netdev_queue_index(queue);
1184 
1185         rcu_read_lock();
1186         dev_maps = rcu_dereference(dev->xps_maps);
1187         if (dev_maps) {
1188                 for_each_possible_cpu(i) {
1189                         struct xps_map *map =
1190                             rcu_dereference(dev_maps->cpu_map[i]);
1191                         if (map) {
1192                                 int j;
1193                                 for (j = 0; j < map->len; j++) {
1194                                         if (map->queues[j] == index) {
1195                                                 cpumask_set_cpu(i, mask);
1196                                                 break;
1197                                         }
1198                                 }
1199                         }
1200                 }
1201         }
1202         rcu_read_unlock();
1203 
1204         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1205         free_cpumask_var(mask);
1206         return len < PAGE_SIZE ? len : -EINVAL;
1207 }
1208 
1209 static ssize_t store_xps_map(struct netdev_queue *queue,
1210                       struct netdev_queue_attribute *attribute,
1211                       const char *buf, size_t len)
1212 {
1213         struct net_device *dev = queue->dev;
1214         unsigned long index;
1215         cpumask_var_t mask;
1216         int err;
1217 
1218         if (!capable(CAP_NET_ADMIN))
1219                 return -EPERM;
1220 
1221         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1222                 return -ENOMEM;
1223 
1224         index = get_netdev_queue_index(queue);
1225 
1226         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1227         if (err) {
1228                 free_cpumask_var(mask);
1229                 return err;
1230         }
1231 
1232         err = netif_set_xps_queue(dev, mask, index);
1233 
1234         free_cpumask_var(mask);
1235 
1236         return err ? : len;
1237 }
1238 
1239 static struct netdev_queue_attribute xps_cpus_attribute =
1240     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1241 #endif /* CONFIG_XPS */
1242 
1243 static struct attribute *netdev_queue_default_attrs[] = {
1244         &queue_trans_timeout.attr,
1245 #ifdef CONFIG_XPS
1246         &xps_cpus_attribute.attr,
1247         &queue_tx_maxrate.attr,
1248 #endif
1249         NULL
1250 };
1251 
1252 static void netdev_queue_release(struct kobject *kobj)
1253 {
1254         struct netdev_queue *queue = to_netdev_queue(kobj);
1255 
1256         memset(kobj, 0, sizeof(*kobj));
1257         dev_put(queue->dev);
1258 }
1259 
1260 static const void *netdev_queue_namespace(struct kobject *kobj)
1261 {
1262         struct netdev_queue *queue = to_netdev_queue(kobj);
1263         struct device *dev = &queue->dev->dev;
1264         const void *ns = NULL;
1265 
1266         if (dev->class && dev->class->ns_type)
1267                 ns = dev->class->namespace(dev);
1268 
1269         return ns;
1270 }
1271 
1272 static struct kobj_type netdev_queue_ktype = {
1273         .sysfs_ops = &netdev_queue_sysfs_ops,
1274         .release = netdev_queue_release,
1275         .default_attrs = netdev_queue_default_attrs,
1276         .namespace = netdev_queue_namespace,
1277 };
1278 
1279 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1280 {
1281         struct netdev_queue *queue = dev->_tx + index;
1282         struct kobject *kobj = &queue->kobj;
1283         int error = 0;
1284 
1285         kobj->kset = dev->queues_kset;
1286         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1287             "tx-%u", index);
1288         if (error)
1289                 goto exit;
1290 
1291 #ifdef CONFIG_BQL
1292         error = sysfs_create_group(kobj, &dql_group);
1293         if (error)
1294                 goto exit;
1295 #endif
1296 
1297         kobject_uevent(kobj, KOBJ_ADD);
1298         dev_hold(queue->dev);
1299 
1300         return 0;
1301 exit:
1302         kobject_put(kobj);
1303         return error;
1304 }
1305 #endif /* CONFIG_SYSFS */
1306 
1307 int
1308 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1309 {
1310 #ifdef CONFIG_SYSFS
1311         int i;
1312         int error = 0;
1313 
1314         for (i = old_num; i < new_num; i++) {
1315                 error = netdev_queue_add_kobject(dev, i);
1316                 if (error) {
1317                         new_num = old_num;
1318                         break;
1319                 }
1320         }
1321 
1322         while (--i >= new_num) {
1323                 struct netdev_queue *queue = dev->_tx + i;
1324 
1325 #ifdef CONFIG_BQL
1326                 sysfs_remove_group(&queue->kobj, &dql_group);
1327 #endif
1328                 kobject_put(&queue->kobj);
1329         }
1330 
1331         return error;
1332 #else
1333         return 0;
1334 #endif /* CONFIG_SYSFS */
1335 }
1336 
1337 static int register_queue_kobjects(struct net_device *dev)
1338 {
1339         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1340 
1341 #ifdef CONFIG_SYSFS
1342         dev->queues_kset = kset_create_and_add("queues",
1343             NULL, &dev->dev.kobj);
1344         if (!dev->queues_kset)
1345                 return -ENOMEM;
1346         real_rx = dev->real_num_rx_queues;
1347 #endif
1348         real_tx = dev->real_num_tx_queues;
1349 
1350         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1351         if (error)
1352                 goto error;
1353         rxq = real_rx;
1354 
1355         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1356         if (error)
1357                 goto error;
1358         txq = real_tx;
1359 
1360         return 0;
1361 
1362 error:
1363         netdev_queue_update_kobjects(dev, txq, 0);
1364         net_rx_queue_update_kobjects(dev, rxq, 0);
1365         return error;
1366 }
1367 
1368 static void remove_queue_kobjects(struct net_device *dev)
1369 {
1370         int real_rx = 0, real_tx = 0;
1371 
1372 #ifdef CONFIG_SYSFS
1373         real_rx = dev->real_num_rx_queues;
1374 #endif
1375         real_tx = dev->real_num_tx_queues;
1376 
1377         net_rx_queue_update_kobjects(dev, real_rx, 0);
1378         netdev_queue_update_kobjects(dev, real_tx, 0);
1379 #ifdef CONFIG_SYSFS
1380         kset_unregister(dev->queues_kset);
1381 #endif
1382 }
1383 
1384 static bool net_current_may_mount(void)
1385 {
1386         struct net *net = current->nsproxy->net_ns;
1387 
1388         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1389 }
1390 
1391 static void *net_grab_current_ns(void)
1392 {
1393         struct net *ns = current->nsproxy->net_ns;
1394 #ifdef CONFIG_NET_NS
1395         if (ns)
1396                 atomic_inc(&ns->passive);
1397 #endif
1398         return ns;
1399 }
1400 
1401 static const void *net_initial_ns(void)
1402 {
1403         return &init_net;
1404 }
1405 
1406 static const void *net_netlink_ns(struct sock *sk)
1407 {
1408         return sock_net(sk);
1409 }
1410 
1411 struct kobj_ns_type_operations net_ns_type_operations = {
1412         .type = KOBJ_NS_TYPE_NET,
1413         .current_may_mount = net_current_may_mount,
1414         .grab_current_ns = net_grab_current_ns,
1415         .netlink_ns = net_netlink_ns,
1416         .initial_ns = net_initial_ns,
1417         .drop_ns = net_drop_ns,
1418 };
1419 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1420 
1421 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1422 {
1423         struct net_device *dev = to_net_dev(d);
1424         int retval;
1425 
1426         /* pass interface to uevent. */
1427         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1428         if (retval)
1429                 goto exit;
1430 
1431         /* pass ifindex to uevent.
1432          * ifindex is useful as it won't change (interface name may change)
1433          * and is what RtNetlink uses natively. */
1434         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1435 
1436 exit:
1437         return retval;
1438 }
1439 
1440 /*
1441  *      netdev_release -- destroy and free a dead device.
1442  *      Called when last reference to device kobject is gone.
1443  */
1444 static void netdev_release(struct device *d)
1445 {
1446         struct net_device *dev = to_net_dev(d);
1447 
1448         BUG_ON(dev->reg_state != NETREG_RELEASED);
1449 
1450         kfree(dev->ifalias);
1451         netdev_freemem(dev);
1452 }
1453 
1454 static const void *net_namespace(struct device *d)
1455 {
1456         struct net_device *dev = to_net_dev(d);
1457 
1458         return dev_net(dev);
1459 }
1460 
1461 static struct class net_class = {
1462         .name = "net",
1463         .dev_release = netdev_release,
1464         .dev_groups = net_class_groups,
1465         .dev_uevent = netdev_uevent,
1466         .ns_type = &net_ns_type_operations,
1467         .namespace = net_namespace,
1468 };
1469 
1470 #ifdef CONFIG_OF_NET
1471 static int of_dev_node_match(struct device *dev, const void *data)
1472 {
1473         int ret = 0;
1474 
1475         if (dev->parent)
1476                 ret = dev->parent->of_node == data;
1477 
1478         return ret == 0 ? dev->of_node == data : ret;
1479 }
1480 
1481 /*
1482  * of_find_net_device_by_node - lookup the net device for the device node
1483  * @np: OF device node
1484  *
1485  * Looks up the net_device structure corresponding with the device node.
1486  * If successful, returns a pointer to the net_device with the embedded
1487  * struct device refcount incremented by one, or NULL on failure. The
1488  * refcount must be dropped when done with the net_device.
1489  */
1490 struct net_device *of_find_net_device_by_node(struct device_node *np)
1491 {
1492         struct device *dev;
1493 
1494         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1495         if (!dev)
1496                 return NULL;
1497 
1498         return to_net_dev(dev);
1499 }
1500 EXPORT_SYMBOL(of_find_net_device_by_node);
1501 #endif
1502 
1503 /* Delete sysfs entries but hold kobject reference until after all
1504  * netdev references are gone.
1505  */
1506 void netdev_unregister_kobject(struct net_device *ndev)
1507 {
1508         struct device *dev = &(ndev->dev);
1509 
1510         kobject_get(&dev->kobj);
1511 
1512         remove_queue_kobjects(ndev);
1513 
1514         pm_runtime_set_memalloc_noio(dev, false);
1515 
1516         device_del(dev);
1517 }
1518 
1519 /* Create sysfs entries for network device. */
1520 int netdev_register_kobject(struct net_device *ndev)
1521 {
1522         struct device *dev = &(ndev->dev);
1523         const struct attribute_group **groups = ndev->sysfs_groups;
1524         int error = 0;
1525 
1526         device_initialize(dev);
1527         dev->class = &net_class;
1528         dev->platform_data = ndev;
1529         dev->groups = groups;
1530 
1531         dev_set_name(dev, "%s", ndev->name);
1532 
1533 #ifdef CONFIG_SYSFS
1534         /* Allow for a device specific group */
1535         if (*groups)
1536                 groups++;
1537 
1538         *groups++ = &netstat_group;
1539 
1540 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1541         if (ndev->ieee80211_ptr)
1542                 *groups++ = &wireless_group;
1543 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1544         else if (ndev->wireless_handlers)
1545                 *groups++ = &wireless_group;
1546 #endif
1547 #endif
1548 #endif /* CONFIG_SYSFS */
1549 
1550         error = device_add(dev);
1551         if (error)
1552                 return error;
1553 
1554         error = register_queue_kobjects(ndev);
1555         if (error) {
1556                 device_del(dev);
1557                 return error;
1558         }
1559 
1560         pm_runtime_set_memalloc_noio(dev, true);
1561 
1562         return error;
1563 }
1564 
1565 int netdev_class_create_file_ns(struct class_attribute *class_attr,
1566                                 const void *ns)
1567 {
1568         return class_create_file_ns(&net_class, class_attr, ns);
1569 }
1570 EXPORT_SYMBOL(netdev_class_create_file_ns);
1571 
1572 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1573                                  const void *ns)
1574 {
1575         class_remove_file_ns(&net_class, class_attr, ns);
1576 }
1577 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1578 
1579 int __init netdev_kobject_init(void)
1580 {
1581         kobj_ns_type_register(&net_ns_type_operations);
1582         return class_register(&net_class);
1583 }
1584 

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