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TOMOYO Linux Cross Reference
Linux/net/core/net-sysfs.c

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.10 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.83 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.153 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.200 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.200 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.76 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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 #include <linux/of_net.h>
 28 
 29 #include "net-sysfs.h"
 30 
 31 #ifdef CONFIG_SYSFS
 32 static const char fmt_hex[] = "%#x\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_link_ksettings cmd;
203 
204                 if (!__ethtool_get_link_ksettings(netdev, &cmd))
205                         ret = sprintf(buf, fmt_dec, cmd.base.speed);
206         }
207         rtnl_unlock();
208         return ret;
209 }
210 static DEVICE_ATTR_RO(speed);
211 
212 static ssize_t duplex_show(struct device *dev,
213                            struct device_attribute *attr, char *buf)
214 {
215         struct net_device *netdev = to_net_dev(dev);
216         int ret = -EINVAL;
217 
218         if (!rtnl_trylock())
219                 return restart_syscall();
220 
221         if (netif_running(netdev)) {
222                 struct ethtool_link_ksettings cmd;
223 
224                 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
225                         const char *duplex;
226 
227                         switch (cmd.base.duplex) {
228                         case DUPLEX_HALF:
229                                 duplex = "half";
230                                 break;
231                         case DUPLEX_FULL:
232                                 duplex = "full";
233                                 break;
234                         default:
235                                 duplex = "unknown";
236                                 break;
237                         }
238                         ret = sprintf(buf, "%s\n", duplex);
239                 }
240         }
241         rtnl_unlock();
242         return ret;
243 }
244 static DEVICE_ATTR_RO(duplex);
245 
246 static ssize_t dormant_show(struct device *dev,
247                             struct device_attribute *attr, char *buf)
248 {
249         struct net_device *netdev = to_net_dev(dev);
250 
251         if (netif_running(netdev))
252                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
253 
254         return -EINVAL;
255 }
256 static DEVICE_ATTR_RO(dormant);
257 
258 static const char *const operstates[] = {
259         "unknown",
260         "notpresent", /* currently unused */
261         "down",
262         "lowerlayerdown",
263         "testing", /* currently unused */
264         "dormant",
265         "up"
266 };
267 
268 static ssize_t operstate_show(struct device *dev,
269                               struct device_attribute *attr, char *buf)
270 {
271         const struct net_device *netdev = to_net_dev(dev);
272         unsigned char operstate;
273 
274         read_lock(&dev_base_lock);
275         operstate = netdev->operstate;
276         if (!netif_running(netdev))
277                 operstate = IF_OPER_DOWN;
278         read_unlock(&dev_base_lock);
279 
280         if (operstate >= ARRAY_SIZE(operstates))
281                 return -EINVAL; /* should not happen */
282 
283         return sprintf(buf, "%s\n", operstates[operstate]);
284 }
285 static DEVICE_ATTR_RO(operstate);
286 
287 static ssize_t carrier_changes_show(struct device *dev,
288                                     struct device_attribute *attr,
289                                     char *buf)
290 {
291         struct net_device *netdev = to_net_dev(dev);
292         return sprintf(buf, fmt_dec,
293                        atomic_read(&netdev->carrier_changes));
294 }
295 static DEVICE_ATTR_RO(carrier_changes);
296 
297 /* read-write attributes */
298 
299 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
300 {
301         return dev_set_mtu(dev, (int) new_mtu);
302 }
303 
304 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
305                          const char *buf, size_t len)
306 {
307         return netdev_store(dev, attr, buf, len, change_mtu);
308 }
309 NETDEVICE_SHOW_RW(mtu, fmt_dec);
310 
311 static int change_flags(struct net_device *dev, unsigned long new_flags)
312 {
313         return dev_change_flags(dev, (unsigned int) new_flags);
314 }
315 
316 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
317                            const char *buf, size_t len)
318 {
319         return netdev_store(dev, attr, buf, len, change_flags);
320 }
321 NETDEVICE_SHOW_RW(flags, fmt_hex);
322 
323 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
324 {
325         int res, orig_len = dev->tx_queue_len;
326 
327         if (new_len != orig_len) {
328                 dev->tx_queue_len = new_len;
329                 res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev);
330                 res = notifier_to_errno(res);
331                 if (res) {
332                         netdev_err(dev,
333                                    "refused to change device tx_queue_len\n");
334                         dev->tx_queue_len = orig_len;
335                         return -EFAULT;
336                 }
337         }
338 
339         return 0;
340 }
341 
342 static ssize_t tx_queue_len_store(struct device *dev,
343                                   struct device_attribute *attr,
344                                   const char *buf, size_t len)
345 {
346         if (!capable(CAP_NET_ADMIN))
347                 return -EPERM;
348 
349         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
350 }
351 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
352 
353 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
354 {
355         dev->gro_flush_timeout = val;
356         return 0;
357 }
358 
359 static ssize_t gro_flush_timeout_store(struct device *dev,
360                                   struct device_attribute *attr,
361                                   const char *buf, size_t len)
362 {
363         if (!capable(CAP_NET_ADMIN))
364                 return -EPERM;
365 
366         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
367 }
368 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
369 
370 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
371                              const char *buf, size_t len)
372 {
373         struct net_device *netdev = to_net_dev(dev);
374         struct net *net = dev_net(netdev);
375         size_t count = len;
376         ssize_t ret;
377 
378         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
379                 return -EPERM;
380 
381         /* ignore trailing newline */
382         if (len >  0 && buf[len - 1] == '\n')
383                 --count;
384 
385         if (!rtnl_trylock())
386                 return restart_syscall();
387         ret = dev_set_alias(netdev, buf, count);
388         rtnl_unlock();
389 
390         return ret < 0 ? ret : len;
391 }
392 
393 static ssize_t ifalias_show(struct device *dev,
394                             struct device_attribute *attr, char *buf)
395 {
396         const struct net_device *netdev = to_net_dev(dev);
397         ssize_t ret = 0;
398 
399         if (!rtnl_trylock())
400                 return restart_syscall();
401         if (netdev->ifalias)
402                 ret = sprintf(buf, "%s\n", netdev->ifalias);
403         rtnl_unlock();
404         return ret;
405 }
406 static DEVICE_ATTR_RW(ifalias);
407 
408 static int change_group(struct net_device *dev, unsigned long new_group)
409 {
410         dev_set_group(dev, (int) new_group);
411         return 0;
412 }
413 
414 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
415                            const char *buf, size_t len)
416 {
417         return netdev_store(dev, attr, buf, len, change_group);
418 }
419 NETDEVICE_SHOW(group, fmt_dec);
420 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
421 
422 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
423 {
424         return dev_change_proto_down(dev, (bool) proto_down);
425 }
426 
427 static ssize_t proto_down_store(struct device *dev,
428                                 struct device_attribute *attr,
429                                 const char *buf, size_t len)
430 {
431         return netdev_store(dev, attr, buf, len, change_proto_down);
432 }
433 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
434 
435 static ssize_t phys_port_id_show(struct device *dev,
436                                  struct device_attribute *attr, char *buf)
437 {
438         struct net_device *netdev = to_net_dev(dev);
439         ssize_t ret = -EINVAL;
440 
441         if (!rtnl_trylock())
442                 return restart_syscall();
443 
444         if (dev_isalive(netdev)) {
445                 struct netdev_phys_item_id ppid;
446 
447                 ret = dev_get_phys_port_id(netdev, &ppid);
448                 if (!ret)
449                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
450         }
451         rtnl_unlock();
452 
453         return ret;
454 }
455 static DEVICE_ATTR_RO(phys_port_id);
456 
457 static ssize_t phys_port_name_show(struct device *dev,
458                                    struct device_attribute *attr, char *buf)
459 {
460         struct net_device *netdev = to_net_dev(dev);
461         ssize_t ret = -EINVAL;
462 
463         if (!rtnl_trylock())
464                 return restart_syscall();
465 
466         if (dev_isalive(netdev)) {
467                 char name[IFNAMSIZ];
468 
469                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
470                 if (!ret)
471                         ret = sprintf(buf, "%s\n", name);
472         }
473         rtnl_unlock();
474 
475         return ret;
476 }
477 static DEVICE_ATTR_RO(phys_port_name);
478 
479 static ssize_t phys_switch_id_show(struct device *dev,
480                                    struct device_attribute *attr, char *buf)
481 {
482         struct net_device *netdev = to_net_dev(dev);
483         ssize_t ret = -EINVAL;
484 
485         if (!rtnl_trylock())
486                 return restart_syscall();
487 
488         if (dev_isalive(netdev)) {
489                 struct switchdev_attr attr = {
490                         .orig_dev = netdev,
491                         .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
492                         .flags = SWITCHDEV_F_NO_RECURSE,
493                 };
494 
495                 ret = switchdev_port_attr_get(netdev, &attr);
496                 if (!ret)
497                         ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
498                                       attr.u.ppid.id);
499         }
500         rtnl_unlock();
501 
502         return ret;
503 }
504 static DEVICE_ATTR_RO(phys_switch_id);
505 
506 static struct attribute *net_class_attrs[] = {
507         &dev_attr_netdev_group.attr,
508         &dev_attr_type.attr,
509         &dev_attr_dev_id.attr,
510         &dev_attr_dev_port.attr,
511         &dev_attr_iflink.attr,
512         &dev_attr_ifindex.attr,
513         &dev_attr_name_assign_type.attr,
514         &dev_attr_addr_assign_type.attr,
515         &dev_attr_addr_len.attr,
516         &dev_attr_link_mode.attr,
517         &dev_attr_address.attr,
518         &dev_attr_broadcast.attr,
519         &dev_attr_speed.attr,
520         &dev_attr_duplex.attr,
521         &dev_attr_dormant.attr,
522         &dev_attr_operstate.attr,
523         &dev_attr_carrier_changes.attr,
524         &dev_attr_ifalias.attr,
525         &dev_attr_carrier.attr,
526         &dev_attr_mtu.attr,
527         &dev_attr_flags.attr,
528         &dev_attr_tx_queue_len.attr,
529         &dev_attr_gro_flush_timeout.attr,
530         &dev_attr_phys_port_id.attr,
531         &dev_attr_phys_port_name.attr,
532         &dev_attr_phys_switch_id.attr,
533         &dev_attr_proto_down.attr,
534         NULL,
535 };
536 ATTRIBUTE_GROUPS(net_class);
537 
538 /* Show a given an attribute in the statistics group */
539 static ssize_t netstat_show(const struct device *d,
540                             struct device_attribute *attr, char *buf,
541                             unsigned long offset)
542 {
543         struct net_device *dev = to_net_dev(d);
544         ssize_t ret = -EINVAL;
545 
546         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
547                         offset % sizeof(u64) != 0);
548 
549         read_lock(&dev_base_lock);
550         if (dev_isalive(dev)) {
551                 struct rtnl_link_stats64 temp;
552                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
553 
554                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
555         }
556         read_unlock(&dev_base_lock);
557         return ret;
558 }
559 
560 /* generate a read-only statistics attribute */
561 #define NETSTAT_ENTRY(name)                                             \
562 static ssize_t name##_show(struct device *d,                            \
563                            struct device_attribute *attr, char *buf)    \
564 {                                                                       \
565         return netstat_show(d, attr, buf,                               \
566                             offsetof(struct rtnl_link_stats64, name));  \
567 }                                                                       \
568 static DEVICE_ATTR_RO(name)
569 
570 NETSTAT_ENTRY(rx_packets);
571 NETSTAT_ENTRY(tx_packets);
572 NETSTAT_ENTRY(rx_bytes);
573 NETSTAT_ENTRY(tx_bytes);
574 NETSTAT_ENTRY(rx_errors);
575 NETSTAT_ENTRY(tx_errors);
576 NETSTAT_ENTRY(rx_dropped);
577 NETSTAT_ENTRY(tx_dropped);
578 NETSTAT_ENTRY(multicast);
579 NETSTAT_ENTRY(collisions);
580 NETSTAT_ENTRY(rx_length_errors);
581 NETSTAT_ENTRY(rx_over_errors);
582 NETSTAT_ENTRY(rx_crc_errors);
583 NETSTAT_ENTRY(rx_frame_errors);
584 NETSTAT_ENTRY(rx_fifo_errors);
585 NETSTAT_ENTRY(rx_missed_errors);
586 NETSTAT_ENTRY(tx_aborted_errors);
587 NETSTAT_ENTRY(tx_carrier_errors);
588 NETSTAT_ENTRY(tx_fifo_errors);
589 NETSTAT_ENTRY(tx_heartbeat_errors);
590 NETSTAT_ENTRY(tx_window_errors);
591 NETSTAT_ENTRY(rx_compressed);
592 NETSTAT_ENTRY(tx_compressed);
593 NETSTAT_ENTRY(rx_nohandler);
594 
595 static struct attribute *netstat_attrs[] = {
596         &dev_attr_rx_packets.attr,
597         &dev_attr_tx_packets.attr,
598         &dev_attr_rx_bytes.attr,
599         &dev_attr_tx_bytes.attr,
600         &dev_attr_rx_errors.attr,
601         &dev_attr_tx_errors.attr,
602         &dev_attr_rx_dropped.attr,
603         &dev_attr_tx_dropped.attr,
604         &dev_attr_multicast.attr,
605         &dev_attr_collisions.attr,
606         &dev_attr_rx_length_errors.attr,
607         &dev_attr_rx_over_errors.attr,
608         &dev_attr_rx_crc_errors.attr,
609         &dev_attr_rx_frame_errors.attr,
610         &dev_attr_rx_fifo_errors.attr,
611         &dev_attr_rx_missed_errors.attr,
612         &dev_attr_tx_aborted_errors.attr,
613         &dev_attr_tx_carrier_errors.attr,
614         &dev_attr_tx_fifo_errors.attr,
615         &dev_attr_tx_heartbeat_errors.attr,
616         &dev_attr_tx_window_errors.attr,
617         &dev_attr_rx_compressed.attr,
618         &dev_attr_tx_compressed.attr,
619         &dev_attr_rx_nohandler.attr,
620         NULL
621 };
622 
623 
624 static struct attribute_group netstat_group = {
625         .name  = "statistics",
626         .attrs  = netstat_attrs,
627 };
628 
629 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
630 static struct attribute *wireless_attrs[] = {
631         NULL
632 };
633 
634 static struct attribute_group wireless_group = {
635         .name = "wireless",
636         .attrs = wireless_attrs,
637 };
638 #endif
639 
640 #else /* CONFIG_SYSFS */
641 #define net_class_groups        NULL
642 #endif /* CONFIG_SYSFS */
643 
644 #ifdef CONFIG_SYSFS
645 #define to_rx_queue_attr(_attr) container_of(_attr,             \
646     struct rx_queue_attribute, attr)
647 
648 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
649 
650 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
651                                   char *buf)
652 {
653         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
654         struct netdev_rx_queue *queue = to_rx_queue(kobj);
655 
656         if (!attribute->show)
657                 return -EIO;
658 
659         return attribute->show(queue, attribute, buf);
660 }
661 
662 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
663                                    const char *buf, size_t count)
664 {
665         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
666         struct netdev_rx_queue *queue = to_rx_queue(kobj);
667 
668         if (!attribute->store)
669                 return -EIO;
670 
671         return attribute->store(queue, attribute, buf, count);
672 }
673 
674 static const struct sysfs_ops rx_queue_sysfs_ops = {
675         .show = rx_queue_attr_show,
676         .store = rx_queue_attr_store,
677 };
678 
679 #ifdef CONFIG_RPS
680 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
681                             struct rx_queue_attribute *attribute, char *buf)
682 {
683         struct rps_map *map;
684         cpumask_var_t mask;
685         int i, len;
686 
687         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
688                 return -ENOMEM;
689 
690         rcu_read_lock();
691         map = rcu_dereference(queue->rps_map);
692         if (map)
693                 for (i = 0; i < map->len; i++)
694                         cpumask_set_cpu(map->cpus[i], mask);
695 
696         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
697         rcu_read_unlock();
698         free_cpumask_var(mask);
699 
700         return len < PAGE_SIZE ? len : -EINVAL;
701 }
702 
703 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
704                       struct rx_queue_attribute *attribute,
705                       const char *buf, size_t len)
706 {
707         struct rps_map *old_map, *map;
708         cpumask_var_t mask;
709         int err, cpu, i;
710         static DEFINE_MUTEX(rps_map_mutex);
711 
712         if (!capable(CAP_NET_ADMIN))
713                 return -EPERM;
714 
715         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
716                 return -ENOMEM;
717 
718         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
719         if (err) {
720                 free_cpumask_var(mask);
721                 return err;
722         }
723 
724         map = kzalloc(max_t(unsigned int,
725             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
726             GFP_KERNEL);
727         if (!map) {
728                 free_cpumask_var(mask);
729                 return -ENOMEM;
730         }
731 
732         i = 0;
733         for_each_cpu_and(cpu, mask, cpu_online_mask)
734                 map->cpus[i++] = cpu;
735 
736         if (i)
737                 map->len = i;
738         else {
739                 kfree(map);
740                 map = NULL;
741         }
742 
743         mutex_lock(&rps_map_mutex);
744         old_map = rcu_dereference_protected(queue->rps_map,
745                                             mutex_is_locked(&rps_map_mutex));
746         rcu_assign_pointer(queue->rps_map, map);
747 
748         if (map)
749                 static_key_slow_inc(&rps_needed);
750         if (old_map)
751                 static_key_slow_dec(&rps_needed);
752 
753         mutex_unlock(&rps_map_mutex);
754 
755         if (old_map)
756                 kfree_rcu(old_map, rcu);
757 
758         free_cpumask_var(mask);
759         return len;
760 }
761 
762 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
763                                            struct rx_queue_attribute *attr,
764                                            char *buf)
765 {
766         struct rps_dev_flow_table *flow_table;
767         unsigned long val = 0;
768 
769         rcu_read_lock();
770         flow_table = rcu_dereference(queue->rps_flow_table);
771         if (flow_table)
772                 val = (unsigned long)flow_table->mask + 1;
773         rcu_read_unlock();
774 
775         return sprintf(buf, "%lu\n", val);
776 }
777 
778 static void rps_dev_flow_table_release(struct rcu_head *rcu)
779 {
780         struct rps_dev_flow_table *table = container_of(rcu,
781             struct rps_dev_flow_table, rcu);
782         vfree(table);
783 }
784 
785 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
786                                      struct rx_queue_attribute *attr,
787                                      const char *buf, size_t len)
788 {
789         unsigned long mask, count;
790         struct rps_dev_flow_table *table, *old_table;
791         static DEFINE_SPINLOCK(rps_dev_flow_lock);
792         int rc;
793 
794         if (!capable(CAP_NET_ADMIN))
795                 return -EPERM;
796 
797         rc = kstrtoul(buf, 0, &count);
798         if (rc < 0)
799                 return rc;
800 
801         if (count) {
802                 mask = count - 1;
803                 /* mask = roundup_pow_of_two(count) - 1;
804                  * without overflows...
805                  */
806                 while ((mask | (mask >> 1)) != mask)
807                         mask |= (mask >> 1);
808                 /* On 64 bit arches, must check mask fits in table->mask (u32),
809                  * and on 32bit arches, must check
810                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
811                  */
812 #if BITS_PER_LONG > 32
813                 if (mask > (unsigned long)(u32)mask)
814                         return -EINVAL;
815 #else
816                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
817                                 / sizeof(struct rps_dev_flow)) {
818                         /* Enforce a limit to prevent overflow */
819                         return -EINVAL;
820                 }
821 #endif
822                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
823                 if (!table)
824                         return -ENOMEM;
825 
826                 table->mask = mask;
827                 for (count = 0; count <= mask; count++)
828                         table->flows[count].cpu = RPS_NO_CPU;
829         } else
830                 table = NULL;
831 
832         spin_lock(&rps_dev_flow_lock);
833         old_table = rcu_dereference_protected(queue->rps_flow_table,
834                                               lockdep_is_held(&rps_dev_flow_lock));
835         rcu_assign_pointer(queue->rps_flow_table, table);
836         spin_unlock(&rps_dev_flow_lock);
837 
838         if (old_table)
839                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
840 
841         return len;
842 }
843 
844 static struct rx_queue_attribute rps_cpus_attribute =
845         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
846 
847 
848 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
849         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
850             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
851 #endif /* CONFIG_RPS */
852 
853 static struct attribute *rx_queue_default_attrs[] = {
854 #ifdef CONFIG_RPS
855         &rps_cpus_attribute.attr,
856         &rps_dev_flow_table_cnt_attribute.attr,
857 #endif
858         NULL
859 };
860 
861 static void rx_queue_release(struct kobject *kobj)
862 {
863         struct netdev_rx_queue *queue = to_rx_queue(kobj);
864 #ifdef CONFIG_RPS
865         struct rps_map *map;
866         struct rps_dev_flow_table *flow_table;
867 
868 
869         map = rcu_dereference_protected(queue->rps_map, 1);
870         if (map) {
871                 RCU_INIT_POINTER(queue->rps_map, NULL);
872                 kfree_rcu(map, rcu);
873         }
874 
875         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
876         if (flow_table) {
877                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
878                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
879         }
880 #endif
881 
882         memset(kobj, 0, sizeof(*kobj));
883         dev_put(queue->dev);
884 }
885 
886 static const void *rx_queue_namespace(struct kobject *kobj)
887 {
888         struct netdev_rx_queue *queue = to_rx_queue(kobj);
889         struct device *dev = &queue->dev->dev;
890         const void *ns = NULL;
891 
892         if (dev->class && dev->class->ns_type)
893                 ns = dev->class->namespace(dev);
894 
895         return ns;
896 }
897 
898 static struct kobj_type rx_queue_ktype = {
899         .sysfs_ops = &rx_queue_sysfs_ops,
900         .release = rx_queue_release,
901         .default_attrs = rx_queue_default_attrs,
902         .namespace = rx_queue_namespace
903 };
904 
905 static int rx_queue_add_kobject(struct net_device *dev, int index)
906 {
907         struct netdev_rx_queue *queue = dev->_rx + index;
908         struct kobject *kobj = &queue->kobj;
909         int error = 0;
910 
911         kobj->kset = dev->queues_kset;
912         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
913             "rx-%u", index);
914         if (error)
915                 goto exit;
916 
917         if (dev->sysfs_rx_queue_group) {
918                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
919                 if (error)
920                         goto exit;
921         }
922 
923         kobject_uevent(kobj, KOBJ_ADD);
924         dev_hold(queue->dev);
925 
926         return error;
927 exit:
928         kobject_put(kobj);
929         return error;
930 }
931 #endif /* CONFIG_SYSFS */
932 
933 int
934 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
935 {
936 #ifdef CONFIG_SYSFS
937         int i;
938         int error = 0;
939 
940 #ifndef CONFIG_RPS
941         if (!dev->sysfs_rx_queue_group)
942                 return 0;
943 #endif
944         for (i = old_num; i < new_num; i++) {
945                 error = rx_queue_add_kobject(dev, i);
946                 if (error) {
947                         new_num = old_num;
948                         break;
949                 }
950         }
951 
952         while (--i >= new_num) {
953                 if (dev->sysfs_rx_queue_group)
954                         sysfs_remove_group(&dev->_rx[i].kobj,
955                                            dev->sysfs_rx_queue_group);
956                 kobject_put(&dev->_rx[i].kobj);
957         }
958 
959         return error;
960 #else
961         return 0;
962 #endif
963 }
964 
965 #ifdef CONFIG_SYSFS
966 /*
967  * netdev_queue sysfs structures and functions.
968  */
969 struct netdev_queue_attribute {
970         struct attribute attr;
971         ssize_t (*show)(struct netdev_queue *queue,
972             struct netdev_queue_attribute *attr, char *buf);
973         ssize_t (*store)(struct netdev_queue *queue,
974             struct netdev_queue_attribute *attr, const char *buf, size_t len);
975 };
976 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
977     struct netdev_queue_attribute, attr)
978 
979 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
980 
981 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
982                                       struct attribute *attr, char *buf)
983 {
984         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
985         struct netdev_queue *queue = to_netdev_queue(kobj);
986 
987         if (!attribute->show)
988                 return -EIO;
989 
990         return attribute->show(queue, attribute, buf);
991 }
992 
993 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
994                                        struct attribute *attr,
995                                        const char *buf, size_t count)
996 {
997         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
998         struct netdev_queue *queue = to_netdev_queue(kobj);
999 
1000         if (!attribute->store)
1001                 return -EIO;
1002 
1003         return attribute->store(queue, attribute, buf, count);
1004 }
1005 
1006 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1007         .show = netdev_queue_attr_show,
1008         .store = netdev_queue_attr_store,
1009 };
1010 
1011 static ssize_t show_trans_timeout(struct netdev_queue *queue,
1012                                   struct netdev_queue_attribute *attribute,
1013                                   char *buf)
1014 {
1015         unsigned long trans_timeout;
1016 
1017         spin_lock_irq(&queue->_xmit_lock);
1018         trans_timeout = queue->trans_timeout;
1019         spin_unlock_irq(&queue->_xmit_lock);
1020 
1021         return sprintf(buf, "%lu", trans_timeout);
1022 }
1023 
1024 #ifdef CONFIG_XPS
1025 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1026 {
1027         struct net_device *dev = queue->dev;
1028         unsigned int i;
1029 
1030         i = queue - dev->_tx;
1031         BUG_ON(i >= dev->num_tx_queues);
1032 
1033         return i;
1034 }
1035 
1036 static ssize_t show_tx_maxrate(struct netdev_queue *queue,
1037                                struct netdev_queue_attribute *attribute,
1038                                char *buf)
1039 {
1040         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1041 }
1042 
1043 static ssize_t set_tx_maxrate(struct netdev_queue *queue,
1044                               struct netdev_queue_attribute *attribute,
1045                               const char *buf, size_t len)
1046 {
1047         struct net_device *dev = queue->dev;
1048         int err, index = get_netdev_queue_index(queue);
1049         u32 rate = 0;
1050 
1051         err = kstrtou32(buf, 10, &rate);
1052         if (err < 0)
1053                 return err;
1054 
1055         if (!rtnl_trylock())
1056                 return restart_syscall();
1057 
1058         err = -EOPNOTSUPP;
1059         if (dev->netdev_ops->ndo_set_tx_maxrate)
1060                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1061 
1062         rtnl_unlock();
1063         if (!err) {
1064                 queue->tx_maxrate = rate;
1065                 return len;
1066         }
1067         return err;
1068 }
1069 
1070 static struct netdev_queue_attribute queue_tx_maxrate =
1071         __ATTR(tx_maxrate, S_IRUGO | S_IWUSR,
1072                show_tx_maxrate, set_tx_maxrate);
1073 #endif
1074 
1075 static struct netdev_queue_attribute queue_trans_timeout =
1076         __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
1077 
1078 #ifdef CONFIG_BQL
1079 /*
1080  * Byte queue limits sysfs structures and functions.
1081  */
1082 static ssize_t bql_show(char *buf, unsigned int value)
1083 {
1084         return sprintf(buf, "%u\n", value);
1085 }
1086 
1087 static ssize_t bql_set(const char *buf, const size_t count,
1088                        unsigned int *pvalue)
1089 {
1090         unsigned int value;
1091         int err;
1092 
1093         if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
1094                 value = DQL_MAX_LIMIT;
1095         else {
1096                 err = kstrtouint(buf, 10, &value);
1097                 if (err < 0)
1098                         return err;
1099                 if (value > DQL_MAX_LIMIT)
1100                         return -EINVAL;
1101         }
1102 
1103         *pvalue = value;
1104 
1105         return count;
1106 }
1107 
1108 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1109                                   struct netdev_queue_attribute *attr,
1110                                   char *buf)
1111 {
1112         struct dql *dql = &queue->dql;
1113 
1114         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1115 }
1116 
1117 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1118                                  struct netdev_queue_attribute *attribute,
1119                                  const char *buf, size_t len)
1120 {
1121         struct dql *dql = &queue->dql;
1122         unsigned int value;
1123         int err;
1124 
1125         err = kstrtouint(buf, 10, &value);
1126         if (err < 0)
1127                 return err;
1128 
1129         dql->slack_hold_time = msecs_to_jiffies(value);
1130 
1131         return len;
1132 }
1133 
1134 static struct netdev_queue_attribute bql_hold_time_attribute =
1135         __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
1136             bql_set_hold_time);
1137 
1138 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1139                                  struct netdev_queue_attribute *attr,
1140                                  char *buf)
1141 {
1142         struct dql *dql = &queue->dql;
1143 
1144         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1145 }
1146 
1147 static struct netdev_queue_attribute bql_inflight_attribute =
1148         __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1149 
1150 #define BQL_ATTR(NAME, FIELD)                                           \
1151 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1152                                  struct netdev_queue_attribute *attr,   \
1153                                  char *buf)                             \
1154 {                                                                       \
1155         return bql_show(buf, queue->dql.FIELD);                         \
1156 }                                                                       \
1157                                                                         \
1158 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1159                                 struct netdev_queue_attribute *attr,    \
1160                                 const char *buf, size_t len)            \
1161 {                                                                       \
1162         return bql_set(buf, len, &queue->dql.FIELD);                    \
1163 }                                                                       \
1164                                                                         \
1165 static struct netdev_queue_attribute bql_ ## NAME ## _attribute =       \
1166         __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME,              \
1167             bql_set_ ## NAME);
1168 
1169 BQL_ATTR(limit, limit)
1170 BQL_ATTR(limit_max, max_limit)
1171 BQL_ATTR(limit_min, min_limit)
1172 
1173 static struct attribute *dql_attrs[] = {
1174         &bql_limit_attribute.attr,
1175         &bql_limit_max_attribute.attr,
1176         &bql_limit_min_attribute.attr,
1177         &bql_hold_time_attribute.attr,
1178         &bql_inflight_attribute.attr,
1179         NULL
1180 };
1181 
1182 static struct attribute_group dql_group = {
1183         .name  = "byte_queue_limits",
1184         .attrs  = dql_attrs,
1185 };
1186 #endif /* CONFIG_BQL */
1187 
1188 #ifdef CONFIG_XPS
1189 static ssize_t show_xps_map(struct netdev_queue *queue,
1190                             struct netdev_queue_attribute *attribute, char *buf)
1191 {
1192         struct net_device *dev = queue->dev;
1193         struct xps_dev_maps *dev_maps;
1194         cpumask_var_t mask;
1195         unsigned long index;
1196         int i, len;
1197 
1198         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1199                 return -ENOMEM;
1200 
1201         index = get_netdev_queue_index(queue);
1202 
1203         rcu_read_lock();
1204         dev_maps = rcu_dereference(dev->xps_maps);
1205         if (dev_maps) {
1206                 for_each_possible_cpu(i) {
1207                         struct xps_map *map =
1208                             rcu_dereference(dev_maps->cpu_map[i]);
1209                         if (map) {
1210                                 int j;
1211                                 for (j = 0; j < map->len; j++) {
1212                                         if (map->queues[j] == index) {
1213                                                 cpumask_set_cpu(i, mask);
1214                                                 break;
1215                                         }
1216                                 }
1217                         }
1218                 }
1219         }
1220         rcu_read_unlock();
1221 
1222         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1223         free_cpumask_var(mask);
1224         return len < PAGE_SIZE ? len : -EINVAL;
1225 }
1226 
1227 static ssize_t store_xps_map(struct netdev_queue *queue,
1228                       struct netdev_queue_attribute *attribute,
1229                       const char *buf, size_t len)
1230 {
1231         struct net_device *dev = queue->dev;
1232         unsigned long index;
1233         cpumask_var_t mask;
1234         int err;
1235 
1236         if (!capable(CAP_NET_ADMIN))
1237                 return -EPERM;
1238 
1239         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1240                 return -ENOMEM;
1241 
1242         index = get_netdev_queue_index(queue);
1243 
1244         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1245         if (err) {
1246                 free_cpumask_var(mask);
1247                 return err;
1248         }
1249 
1250         err = netif_set_xps_queue(dev, mask, index);
1251 
1252         free_cpumask_var(mask);
1253 
1254         return err ? : len;
1255 }
1256 
1257 static struct netdev_queue_attribute xps_cpus_attribute =
1258     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1259 #endif /* CONFIG_XPS */
1260 
1261 static struct attribute *netdev_queue_default_attrs[] = {
1262         &queue_trans_timeout.attr,
1263 #ifdef CONFIG_XPS
1264         &xps_cpus_attribute.attr,
1265         &queue_tx_maxrate.attr,
1266 #endif
1267         NULL
1268 };
1269 
1270 static void netdev_queue_release(struct kobject *kobj)
1271 {
1272         struct netdev_queue *queue = to_netdev_queue(kobj);
1273 
1274         memset(kobj, 0, sizeof(*kobj));
1275         dev_put(queue->dev);
1276 }
1277 
1278 static const void *netdev_queue_namespace(struct kobject *kobj)
1279 {
1280         struct netdev_queue *queue = to_netdev_queue(kobj);
1281         struct device *dev = &queue->dev->dev;
1282         const void *ns = NULL;
1283 
1284         if (dev->class && dev->class->ns_type)
1285                 ns = dev->class->namespace(dev);
1286 
1287         return ns;
1288 }
1289 
1290 static struct kobj_type netdev_queue_ktype = {
1291         .sysfs_ops = &netdev_queue_sysfs_ops,
1292         .release = netdev_queue_release,
1293         .default_attrs = netdev_queue_default_attrs,
1294         .namespace = netdev_queue_namespace,
1295 };
1296 
1297 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1298 {
1299         struct netdev_queue *queue = dev->_tx + index;
1300         struct kobject *kobj = &queue->kobj;
1301         int error = 0;
1302 
1303         kobj->kset = dev->queues_kset;
1304         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1305             "tx-%u", index);
1306         if (error)
1307                 goto exit;
1308 
1309 #ifdef CONFIG_BQL
1310         error = sysfs_create_group(kobj, &dql_group);
1311         if (error)
1312                 goto exit;
1313 #endif
1314 
1315         kobject_uevent(kobj, KOBJ_ADD);
1316         dev_hold(queue->dev);
1317 
1318         return 0;
1319 exit:
1320         kobject_put(kobj);
1321         return error;
1322 }
1323 #endif /* CONFIG_SYSFS */
1324 
1325 int
1326 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1327 {
1328 #ifdef CONFIG_SYSFS
1329         int i;
1330         int error = 0;
1331 
1332         for (i = old_num; i < new_num; i++) {
1333                 error = netdev_queue_add_kobject(dev, i);
1334                 if (error) {
1335                         new_num = old_num;
1336                         break;
1337                 }
1338         }
1339 
1340         while (--i >= new_num) {
1341                 struct netdev_queue *queue = dev->_tx + i;
1342 
1343 #ifdef CONFIG_BQL
1344                 sysfs_remove_group(&queue->kobj, &dql_group);
1345 #endif
1346                 kobject_put(&queue->kobj);
1347         }
1348 
1349         return error;
1350 #else
1351         return 0;
1352 #endif /* CONFIG_SYSFS */
1353 }
1354 
1355 static int register_queue_kobjects(struct net_device *dev)
1356 {
1357         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1358 
1359 #ifdef CONFIG_SYSFS
1360         dev->queues_kset = kset_create_and_add("queues",
1361             NULL, &dev->dev.kobj);
1362         if (!dev->queues_kset)
1363                 return -ENOMEM;
1364         real_rx = dev->real_num_rx_queues;
1365 #endif
1366         real_tx = dev->real_num_tx_queues;
1367 
1368         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1369         if (error)
1370                 goto error;
1371         rxq = real_rx;
1372 
1373         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1374         if (error)
1375                 goto error;
1376         txq = real_tx;
1377 
1378         return 0;
1379 
1380 error:
1381         netdev_queue_update_kobjects(dev, txq, 0);
1382         net_rx_queue_update_kobjects(dev, rxq, 0);
1383         return error;
1384 }
1385 
1386 static void remove_queue_kobjects(struct net_device *dev)
1387 {
1388         int real_rx = 0, real_tx = 0;
1389 
1390 #ifdef CONFIG_SYSFS
1391         real_rx = dev->real_num_rx_queues;
1392 #endif
1393         real_tx = dev->real_num_tx_queues;
1394 
1395         net_rx_queue_update_kobjects(dev, real_rx, 0);
1396         netdev_queue_update_kobjects(dev, real_tx, 0);
1397 #ifdef CONFIG_SYSFS
1398         kset_unregister(dev->queues_kset);
1399 #endif
1400 }
1401 
1402 static bool net_current_may_mount(void)
1403 {
1404         struct net *net = current->nsproxy->net_ns;
1405 
1406         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1407 }
1408 
1409 static void *net_grab_current_ns(void)
1410 {
1411         struct net *ns = current->nsproxy->net_ns;
1412 #ifdef CONFIG_NET_NS
1413         if (ns)
1414                 atomic_inc(&ns->passive);
1415 #endif
1416         return ns;
1417 }
1418 
1419 static const void *net_initial_ns(void)
1420 {
1421         return &init_net;
1422 }
1423 
1424 static const void *net_netlink_ns(struct sock *sk)
1425 {
1426         return sock_net(sk);
1427 }
1428 
1429 struct kobj_ns_type_operations net_ns_type_operations = {
1430         .type = KOBJ_NS_TYPE_NET,
1431         .current_may_mount = net_current_may_mount,
1432         .grab_current_ns = net_grab_current_ns,
1433         .netlink_ns = net_netlink_ns,
1434         .initial_ns = net_initial_ns,
1435         .drop_ns = net_drop_ns,
1436 };
1437 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1438 
1439 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1440 {
1441         struct net_device *dev = to_net_dev(d);
1442         int retval;
1443 
1444         /* pass interface to uevent. */
1445         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1446         if (retval)
1447                 goto exit;
1448 
1449         /* pass ifindex to uevent.
1450          * ifindex is useful as it won't change (interface name may change)
1451          * and is what RtNetlink uses natively. */
1452         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1453 
1454 exit:
1455         return retval;
1456 }
1457 
1458 /*
1459  *      netdev_release -- destroy and free a dead device.
1460  *      Called when last reference to device kobject is gone.
1461  */
1462 static void netdev_release(struct device *d)
1463 {
1464         struct net_device *dev = to_net_dev(d);
1465 
1466         BUG_ON(dev->reg_state != NETREG_RELEASED);
1467 
1468         kfree(dev->ifalias);
1469         netdev_freemem(dev);
1470 }
1471 
1472 static const void *net_namespace(struct device *d)
1473 {
1474         struct net_device *dev = to_net_dev(d);
1475 
1476         return dev_net(dev);
1477 }
1478 
1479 static struct class net_class = {
1480         .name = "net",
1481         .dev_release = netdev_release,
1482         .dev_groups = net_class_groups,
1483         .dev_uevent = netdev_uevent,
1484         .ns_type = &net_ns_type_operations,
1485         .namespace = net_namespace,
1486 };
1487 
1488 #ifdef CONFIG_OF_NET
1489 static int of_dev_node_match(struct device *dev, const void *data)
1490 {
1491         int ret = 0;
1492 
1493         if (dev->parent)
1494                 ret = dev->parent->of_node == data;
1495 
1496         return ret == 0 ? dev->of_node == data : ret;
1497 }
1498 
1499 /*
1500  * of_find_net_device_by_node - lookup the net device for the device node
1501  * @np: OF device node
1502  *
1503  * Looks up the net_device structure corresponding with the device node.
1504  * If successful, returns a pointer to the net_device with the embedded
1505  * struct device refcount incremented by one, or NULL on failure. The
1506  * refcount must be dropped when done with the net_device.
1507  */
1508 struct net_device *of_find_net_device_by_node(struct device_node *np)
1509 {
1510         struct device *dev;
1511 
1512         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1513         if (!dev)
1514                 return NULL;
1515 
1516         return to_net_dev(dev);
1517 }
1518 EXPORT_SYMBOL(of_find_net_device_by_node);
1519 #endif
1520 
1521 /* Delete sysfs entries but hold kobject reference until after all
1522  * netdev references are gone.
1523  */
1524 void netdev_unregister_kobject(struct net_device *ndev)
1525 {
1526         struct device *dev = &(ndev->dev);
1527 
1528         kobject_get(&dev->kobj);
1529 
1530         remove_queue_kobjects(ndev);
1531 
1532         pm_runtime_set_memalloc_noio(dev, false);
1533 
1534         device_del(dev);
1535 }
1536 
1537 /* Create sysfs entries for network device. */
1538 int netdev_register_kobject(struct net_device *ndev)
1539 {
1540         struct device *dev = &(ndev->dev);
1541         const struct attribute_group **groups = ndev->sysfs_groups;
1542         int error = 0;
1543 
1544         device_initialize(dev);
1545         dev->class = &net_class;
1546         dev->platform_data = ndev;
1547         dev->groups = groups;
1548 
1549         dev_set_name(dev, "%s", ndev->name);
1550 
1551 #ifdef CONFIG_SYSFS
1552         /* Allow for a device specific group */
1553         if (*groups)
1554                 groups++;
1555 
1556         *groups++ = &netstat_group;
1557 
1558 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1559         if (ndev->ieee80211_ptr)
1560                 *groups++ = &wireless_group;
1561 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1562         else if (ndev->wireless_handlers)
1563                 *groups++ = &wireless_group;
1564 #endif
1565 #endif
1566 #endif /* CONFIG_SYSFS */
1567 
1568         error = device_add(dev);
1569         if (error)
1570                 return error;
1571 
1572         error = register_queue_kobjects(ndev);
1573         if (error) {
1574                 device_del(dev);
1575                 return error;
1576         }
1577 
1578         pm_runtime_set_memalloc_noio(dev, true);
1579 
1580         return error;
1581 }
1582 
1583 int netdev_class_create_file_ns(struct class_attribute *class_attr,
1584                                 const void *ns)
1585 {
1586         return class_create_file_ns(&net_class, class_attr, ns);
1587 }
1588 EXPORT_SYMBOL(netdev_class_create_file_ns);
1589 
1590 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1591                                  const void *ns)
1592 {
1593         class_remove_file_ns(&net_class, class_attr, ns);
1594 }
1595 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1596 
1597 int __init netdev_kobject_init(void)
1598 {
1599         kobj_ns_type_register(&net_ns_type_operations);
1600         return class_register(&net_class);
1601 }
1602 

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