~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.11-rc3 ] ~ [ linux-5.10.7 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.89 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.167 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.215 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.251 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.251 ] ~ [ 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-3.16.85 ] ~ [ 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-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * net-sysfs.c - network device class and attributes
  4  *
  5  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
  6  */
  7 
  8 #include <linux/capability.h>
  9 #include <linux/kernel.h>
 10 #include <linux/netdevice.h>
 11 #include <linux/if_arp.h>
 12 #include <linux/slab.h>
 13 #include <linux/sched/signal.h>
 14 #include <linux/nsproxy.h>
 15 #include <net/sock.h>
 16 #include <net/net_namespace.h>
 17 #include <linux/rtnetlink.h>
 18 #include <linux/vmalloc.h>
 19 #include <linux/export.h>
 20 #include <linux/jiffies.h>
 21 #include <linux/pm_runtime.h>
 22 #include <linux/of.h>
 23 #include <linux/of_net.h>
 24 #include <linux/cpu.h>
 25 
 26 #include "net-sysfs.h"
 27 
 28 #ifdef CONFIG_SYSFS
 29 static const char fmt_hex[] = "%#x\n";
 30 static const char fmt_dec[] = "%d\n";
 31 static const char fmt_ulong[] = "%lu\n";
 32 static const char fmt_u64[] = "%llu\n";
 33 
 34 static inline int dev_isalive(const struct net_device *dev)
 35 {
 36         return dev->reg_state <= NETREG_REGISTERED;
 37 }
 38 
 39 /* use same locking rules as GIF* ioctl's */
 40 static ssize_t netdev_show(const struct device *dev,
 41                            struct device_attribute *attr, char *buf,
 42                            ssize_t (*format)(const struct net_device *, char *))
 43 {
 44         struct net_device *ndev = to_net_dev(dev);
 45         ssize_t ret = -EINVAL;
 46 
 47         read_lock(&dev_base_lock);
 48         if (dev_isalive(ndev))
 49                 ret = (*format)(ndev, buf);
 50         read_unlock(&dev_base_lock);
 51 
 52         return ret;
 53 }
 54 
 55 /* generate a show function for simple field */
 56 #define NETDEVICE_SHOW(field, format_string)                            \
 57 static ssize_t format_##field(const struct net_device *dev, char *buf)  \
 58 {                                                                       \
 59         return sprintf(buf, format_string, dev->field);                 \
 60 }                                                                       \
 61 static ssize_t field##_show(struct device *dev,                         \
 62                             struct device_attribute *attr, char *buf)   \
 63 {                                                                       \
 64         return netdev_show(dev, attr, buf, format_##field);             \
 65 }                                                                       \
 66 
 67 #define NETDEVICE_SHOW_RO(field, format_string)                         \
 68 NETDEVICE_SHOW(field, format_string);                                   \
 69 static DEVICE_ATTR_RO(field)
 70 
 71 #define NETDEVICE_SHOW_RW(field, format_string)                         \
 72 NETDEVICE_SHOW(field, format_string);                                   \
 73 static DEVICE_ATTR_RW(field)
 74 
 75 /* use same locking and permission rules as SIF* ioctl's */
 76 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
 77                             const char *buf, size_t len,
 78                             int (*set)(struct net_device *, unsigned long))
 79 {
 80         struct net_device *netdev = to_net_dev(dev);
 81         struct net *net = dev_net(netdev);
 82         unsigned long new;
 83         int ret = -EINVAL;
 84 
 85         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 86                 return -EPERM;
 87 
 88         ret = kstrtoul(buf, 0, &new);
 89         if (ret)
 90                 goto err;
 91 
 92         if (!rtnl_trylock())
 93                 return restart_syscall();
 94 
 95         if (dev_isalive(netdev)) {
 96                 ret = (*set)(netdev, new);
 97                 if (ret == 0)
 98                         ret = len;
 99         }
100         rtnl_unlock();
101  err:
102         return ret;
103 }
104 
105 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
106 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
107 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
108 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
109 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
110 NETDEVICE_SHOW_RO(type, fmt_dec);
111 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
112 
113 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
114                            char *buf)
115 {
116         struct net_device *ndev = to_net_dev(dev);
117 
118         return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
119 }
120 static DEVICE_ATTR_RO(iflink);
121 
122 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
123 {
124         return sprintf(buf, fmt_dec, dev->name_assign_type);
125 }
126 
127 static ssize_t name_assign_type_show(struct device *dev,
128                                      struct device_attribute *attr,
129                                      char *buf)
130 {
131         struct net_device *ndev = to_net_dev(dev);
132         ssize_t ret = -EINVAL;
133 
134         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
135                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
136 
137         return ret;
138 }
139 static DEVICE_ATTR_RO(name_assign_type);
140 
141 /* use same locking rules as GIFHWADDR ioctl's */
142 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
143                             char *buf)
144 {
145         struct net_device *ndev = to_net_dev(dev);
146         ssize_t ret = -EINVAL;
147 
148         read_lock(&dev_base_lock);
149         if (dev_isalive(ndev))
150                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
151         read_unlock(&dev_base_lock);
152         return ret;
153 }
154 static DEVICE_ATTR_RO(address);
155 
156 static ssize_t broadcast_show(struct device *dev,
157                               struct device_attribute *attr, char *buf)
158 {
159         struct net_device *ndev = to_net_dev(dev);
160 
161         if (dev_isalive(ndev))
162                 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
163         return -EINVAL;
164 }
165 static DEVICE_ATTR_RO(broadcast);
166 
167 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
168 {
169         if (!netif_running(dev))
170                 return -EINVAL;
171         return dev_change_carrier(dev, (bool)new_carrier);
172 }
173 
174 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
175                              const char *buf, size_t len)
176 {
177         return netdev_store(dev, attr, buf, len, change_carrier);
178 }
179 
180 static ssize_t carrier_show(struct device *dev,
181                             struct device_attribute *attr, char *buf)
182 {
183         struct net_device *netdev = to_net_dev(dev);
184 
185         if (netif_running(netdev))
186                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
187 
188         return -EINVAL;
189 }
190 static DEVICE_ATTR_RW(carrier);
191 
192 static ssize_t speed_show(struct device *dev,
193                           struct device_attribute *attr, char *buf)
194 {
195         struct net_device *netdev = to_net_dev(dev);
196         int ret = -EINVAL;
197 
198         if (!rtnl_trylock())
199                 return restart_syscall();
200 
201         if (netif_running(netdev)) {
202                 struct ethtool_link_ksettings cmd;
203 
204                 if (!__ethtool_get_link_ksettings(netdev, &cmd))
205                         ret = sprintf(buf, fmt_dec, cmd.base.speed);
206         }
207         rtnl_unlock();
208         return ret;
209 }
210 static DEVICE_ATTR_RO(speed);
211 
212 static ssize_t duplex_show(struct device *dev,
213                            struct device_attribute *attr, char *buf)
214 {
215         struct net_device *netdev = to_net_dev(dev);
216         int ret = -EINVAL;
217 
218         if (!rtnl_trylock())
219                 return restart_syscall();
220 
221         if (netif_running(netdev)) {
222                 struct ethtool_link_ksettings cmd;
223 
224                 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
225                         const char *duplex;
226 
227                         switch (cmd.base.duplex) {
228                         case DUPLEX_HALF:
229                                 duplex = "half";
230                                 break;
231                         case DUPLEX_FULL:
232                                 duplex = "full";
233                                 break;
234                         default:
235                                 duplex = "unknown";
236                                 break;
237                         }
238                         ret = sprintf(buf, "%s\n", duplex);
239                 }
240         }
241         rtnl_unlock();
242         return ret;
243 }
244 static DEVICE_ATTR_RO(duplex);
245 
246 static ssize_t dormant_show(struct device *dev,
247                             struct device_attribute *attr, char *buf)
248 {
249         struct net_device *netdev = to_net_dev(dev);
250 
251         if (netif_running(netdev))
252                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
253 
254         return -EINVAL;
255 }
256 static DEVICE_ATTR_RO(dormant);
257 
258 static const char *const operstates[] = {
259         "unknown",
260         "notpresent", /* currently unused */
261         "down",
262         "lowerlayerdown",
263         "testing", /* currently unused */
264         "dormant",
265         "up"
266 };
267 
268 static ssize_t operstate_show(struct device *dev,
269                               struct device_attribute *attr, char *buf)
270 {
271         const struct net_device *netdev = to_net_dev(dev);
272         unsigned char operstate;
273 
274         read_lock(&dev_base_lock);
275         operstate = netdev->operstate;
276         if (!netif_running(netdev))
277                 operstate = IF_OPER_DOWN;
278         read_unlock(&dev_base_lock);
279 
280         if (operstate >= ARRAY_SIZE(operstates))
281                 return -EINVAL; /* should not happen */
282 
283         return sprintf(buf, "%s\n", operstates[operstate]);
284 }
285 static DEVICE_ATTR_RO(operstate);
286 
287 static ssize_t carrier_changes_show(struct device *dev,
288                                     struct device_attribute *attr,
289                                     char *buf)
290 {
291         struct net_device *netdev = to_net_dev(dev);
292 
293         return sprintf(buf, fmt_dec,
294                        atomic_read(&netdev->carrier_up_count) +
295                        atomic_read(&netdev->carrier_down_count));
296 }
297 static DEVICE_ATTR_RO(carrier_changes);
298 
299 static ssize_t carrier_up_count_show(struct device *dev,
300                                      struct device_attribute *attr,
301                                      char *buf)
302 {
303         struct net_device *netdev = to_net_dev(dev);
304 
305         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
306 }
307 static DEVICE_ATTR_RO(carrier_up_count);
308 
309 static ssize_t carrier_down_count_show(struct device *dev,
310                                        struct device_attribute *attr,
311                                        char *buf)
312 {
313         struct net_device *netdev = to_net_dev(dev);
314 
315         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
316 }
317 static DEVICE_ATTR_RO(carrier_down_count);
318 
319 /* read-write attributes */
320 
321 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
322 {
323         return dev_set_mtu(dev, (int)new_mtu);
324 }
325 
326 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
327                          const char *buf, size_t len)
328 {
329         return netdev_store(dev, attr, buf, len, change_mtu);
330 }
331 NETDEVICE_SHOW_RW(mtu, fmt_dec);
332 
333 static int change_flags(struct net_device *dev, unsigned long new_flags)
334 {
335         return dev_change_flags(dev, (unsigned int)new_flags, NULL);
336 }
337 
338 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
339                            const char *buf, size_t len)
340 {
341         return netdev_store(dev, attr, buf, len, change_flags);
342 }
343 NETDEVICE_SHOW_RW(flags, fmt_hex);
344 
345 static ssize_t tx_queue_len_store(struct device *dev,
346                                   struct device_attribute *attr,
347                                   const char *buf, size_t len)
348 {
349         if (!capable(CAP_NET_ADMIN))
350                 return -EPERM;
351 
352         return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
353 }
354 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
355 
356 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
357 {
358         dev->gro_flush_timeout = val;
359         return 0;
360 }
361 
362 static ssize_t gro_flush_timeout_store(struct device *dev,
363                                        struct device_attribute *attr,
364                                        const char *buf, size_t len)
365 {
366         if (!capable(CAP_NET_ADMIN))
367                 return -EPERM;
368 
369         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
370 }
371 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
372 
373 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
374                              const char *buf, size_t len)
375 {
376         struct net_device *netdev = to_net_dev(dev);
377         struct net *net = dev_net(netdev);
378         size_t count = len;
379         ssize_t ret = 0;
380 
381         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
382                 return -EPERM;
383 
384         /* ignore trailing newline */
385         if (len >  0 && buf[len - 1] == '\n')
386                 --count;
387 
388         if (!rtnl_trylock())
389                 return restart_syscall();
390 
391         if (dev_isalive(netdev)) {
392                 ret = dev_set_alias(netdev, buf, count);
393                 if (ret < 0)
394                         goto err;
395                 ret = len;
396                 netdev_state_change(netdev);
397         }
398 err:
399         rtnl_unlock();
400 
401         return ret;
402 }
403 
404 static ssize_t ifalias_show(struct device *dev,
405                             struct device_attribute *attr, char *buf)
406 {
407         const struct net_device *netdev = to_net_dev(dev);
408         char tmp[IFALIASZ];
409         ssize_t ret = 0;
410 
411         ret = dev_get_alias(netdev, tmp, sizeof(tmp));
412         if (ret > 0)
413                 ret = sprintf(buf, "%s\n", tmp);
414         return ret;
415 }
416 static DEVICE_ATTR_RW(ifalias);
417 
418 static int change_group(struct net_device *dev, unsigned long new_group)
419 {
420         dev_set_group(dev, (int)new_group);
421         return 0;
422 }
423 
424 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
425                            const char *buf, size_t len)
426 {
427         return netdev_store(dev, attr, buf, len, change_group);
428 }
429 NETDEVICE_SHOW(group, fmt_dec);
430 static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
431 
432 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
433 {
434         return dev_change_proto_down(dev, (bool)proto_down);
435 }
436 
437 static ssize_t proto_down_store(struct device *dev,
438                                 struct device_attribute *attr,
439                                 const char *buf, size_t len)
440 {
441         return netdev_store(dev, attr, buf, len, change_proto_down);
442 }
443 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
444 
445 static ssize_t phys_port_id_show(struct device *dev,
446                                  struct device_attribute *attr, char *buf)
447 {
448         struct net_device *netdev = to_net_dev(dev);
449         ssize_t ret = -EINVAL;
450 
451         if (!rtnl_trylock())
452                 return restart_syscall();
453 
454         if (dev_isalive(netdev)) {
455                 struct netdev_phys_item_id ppid;
456 
457                 ret = dev_get_phys_port_id(netdev, &ppid);
458                 if (!ret)
459                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
460         }
461         rtnl_unlock();
462 
463         return ret;
464 }
465 static DEVICE_ATTR_RO(phys_port_id);
466 
467 static ssize_t phys_port_name_show(struct device *dev,
468                                    struct device_attribute *attr, char *buf)
469 {
470         struct net_device *netdev = to_net_dev(dev);
471         ssize_t ret = -EINVAL;
472 
473         if (!rtnl_trylock())
474                 return restart_syscall();
475 
476         if (dev_isalive(netdev)) {
477                 char name[IFNAMSIZ];
478 
479                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
480                 if (!ret)
481                         ret = sprintf(buf, "%s\n", name);
482         }
483         rtnl_unlock();
484 
485         return ret;
486 }
487 static DEVICE_ATTR_RO(phys_port_name);
488 
489 static ssize_t phys_switch_id_show(struct device *dev,
490                                    struct device_attribute *attr, char *buf)
491 {
492         struct net_device *netdev = to_net_dev(dev);
493         ssize_t ret = -EINVAL;
494 
495         if (!rtnl_trylock())
496                 return restart_syscall();
497 
498         if (dev_isalive(netdev)) {
499                 struct netdev_phys_item_id ppid = { };
500 
501                 ret = dev_get_port_parent_id(netdev, &ppid, false);
502                 if (!ret)
503                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
504         }
505         rtnl_unlock();
506 
507         return ret;
508 }
509 static DEVICE_ATTR_RO(phys_switch_id);
510 
511 static struct attribute *net_class_attrs[] __ro_after_init = {
512         &dev_attr_netdev_group.attr,
513         &dev_attr_type.attr,
514         &dev_attr_dev_id.attr,
515         &dev_attr_dev_port.attr,
516         &dev_attr_iflink.attr,
517         &dev_attr_ifindex.attr,
518         &dev_attr_name_assign_type.attr,
519         &dev_attr_addr_assign_type.attr,
520         &dev_attr_addr_len.attr,
521         &dev_attr_link_mode.attr,
522         &dev_attr_address.attr,
523         &dev_attr_broadcast.attr,
524         &dev_attr_speed.attr,
525         &dev_attr_duplex.attr,
526         &dev_attr_dormant.attr,
527         &dev_attr_operstate.attr,
528         &dev_attr_carrier_changes.attr,
529         &dev_attr_ifalias.attr,
530         &dev_attr_carrier.attr,
531         &dev_attr_mtu.attr,
532         &dev_attr_flags.attr,
533         &dev_attr_tx_queue_len.attr,
534         &dev_attr_gro_flush_timeout.attr,
535         &dev_attr_phys_port_id.attr,
536         &dev_attr_phys_port_name.attr,
537         &dev_attr_phys_switch_id.attr,
538         &dev_attr_proto_down.attr,
539         &dev_attr_carrier_up_count.attr,
540         &dev_attr_carrier_down_count.attr,
541         NULL,
542 };
543 ATTRIBUTE_GROUPS(net_class);
544 
545 /* Show a given an attribute in the statistics group */
546 static ssize_t netstat_show(const struct device *d,
547                             struct device_attribute *attr, char *buf,
548                             unsigned long offset)
549 {
550         struct net_device *dev = to_net_dev(d);
551         ssize_t ret = -EINVAL;
552 
553         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
554                 offset % sizeof(u64) != 0);
555 
556         read_lock(&dev_base_lock);
557         if (dev_isalive(dev)) {
558                 struct rtnl_link_stats64 temp;
559                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
560 
561                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
562         }
563         read_unlock(&dev_base_lock);
564         return ret;
565 }
566 
567 /* generate a read-only statistics attribute */
568 #define NETSTAT_ENTRY(name)                                             \
569 static ssize_t name##_show(struct device *d,                            \
570                            struct device_attribute *attr, char *buf)    \
571 {                                                                       \
572         return netstat_show(d, attr, buf,                               \
573                             offsetof(struct rtnl_link_stats64, name));  \
574 }                                                                       \
575 static DEVICE_ATTR_RO(name)
576 
577 NETSTAT_ENTRY(rx_packets);
578 NETSTAT_ENTRY(tx_packets);
579 NETSTAT_ENTRY(rx_bytes);
580 NETSTAT_ENTRY(tx_bytes);
581 NETSTAT_ENTRY(rx_errors);
582 NETSTAT_ENTRY(tx_errors);
583 NETSTAT_ENTRY(rx_dropped);
584 NETSTAT_ENTRY(tx_dropped);
585 NETSTAT_ENTRY(multicast);
586 NETSTAT_ENTRY(collisions);
587 NETSTAT_ENTRY(rx_length_errors);
588 NETSTAT_ENTRY(rx_over_errors);
589 NETSTAT_ENTRY(rx_crc_errors);
590 NETSTAT_ENTRY(rx_frame_errors);
591 NETSTAT_ENTRY(rx_fifo_errors);
592 NETSTAT_ENTRY(rx_missed_errors);
593 NETSTAT_ENTRY(tx_aborted_errors);
594 NETSTAT_ENTRY(tx_carrier_errors);
595 NETSTAT_ENTRY(tx_fifo_errors);
596 NETSTAT_ENTRY(tx_heartbeat_errors);
597 NETSTAT_ENTRY(tx_window_errors);
598 NETSTAT_ENTRY(rx_compressed);
599 NETSTAT_ENTRY(tx_compressed);
600 NETSTAT_ENTRY(rx_nohandler);
601 
602 static struct attribute *netstat_attrs[] __ro_after_init = {
603         &dev_attr_rx_packets.attr,
604         &dev_attr_tx_packets.attr,
605         &dev_attr_rx_bytes.attr,
606         &dev_attr_tx_bytes.attr,
607         &dev_attr_rx_errors.attr,
608         &dev_attr_tx_errors.attr,
609         &dev_attr_rx_dropped.attr,
610         &dev_attr_tx_dropped.attr,
611         &dev_attr_multicast.attr,
612         &dev_attr_collisions.attr,
613         &dev_attr_rx_length_errors.attr,
614         &dev_attr_rx_over_errors.attr,
615         &dev_attr_rx_crc_errors.attr,
616         &dev_attr_rx_frame_errors.attr,
617         &dev_attr_rx_fifo_errors.attr,
618         &dev_attr_rx_missed_errors.attr,
619         &dev_attr_tx_aborted_errors.attr,
620         &dev_attr_tx_carrier_errors.attr,
621         &dev_attr_tx_fifo_errors.attr,
622         &dev_attr_tx_heartbeat_errors.attr,
623         &dev_attr_tx_window_errors.attr,
624         &dev_attr_rx_compressed.attr,
625         &dev_attr_tx_compressed.attr,
626         &dev_attr_rx_nohandler.attr,
627         NULL
628 };
629 
630 static const struct attribute_group netstat_group = {
631         .name  = "statistics",
632         .attrs  = netstat_attrs,
633 };
634 
635 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
636 static struct attribute *wireless_attrs[] = {
637         NULL
638 };
639 
640 static const struct attribute_group wireless_group = {
641         .name = "wireless",
642         .attrs = wireless_attrs,
643 };
644 #endif
645 
646 #else /* CONFIG_SYSFS */
647 #define net_class_groups        NULL
648 #endif /* CONFIG_SYSFS */
649 
650 #ifdef CONFIG_SYSFS
651 #define to_rx_queue_attr(_attr) \
652         container_of(_attr, struct rx_queue_attribute, attr)
653 
654 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
655 
656 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
657                                   char *buf)
658 {
659         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
660         struct netdev_rx_queue *queue = to_rx_queue(kobj);
661 
662         if (!attribute->show)
663                 return -EIO;
664 
665         return attribute->show(queue, buf);
666 }
667 
668 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
669                                    const char *buf, size_t count)
670 {
671         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
672         struct netdev_rx_queue *queue = to_rx_queue(kobj);
673 
674         if (!attribute->store)
675                 return -EIO;
676 
677         return attribute->store(queue, buf, count);
678 }
679 
680 static const struct sysfs_ops rx_queue_sysfs_ops = {
681         .show = rx_queue_attr_show,
682         .store = rx_queue_attr_store,
683 };
684 
685 #ifdef CONFIG_RPS
686 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
687 {
688         struct rps_map *map;
689         cpumask_var_t mask;
690         int i, len;
691 
692         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
693                 return -ENOMEM;
694 
695         rcu_read_lock();
696         map = rcu_dereference(queue->rps_map);
697         if (map)
698                 for (i = 0; i < map->len; i++)
699                         cpumask_set_cpu(map->cpus[i], mask);
700 
701         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
702         rcu_read_unlock();
703         free_cpumask_var(mask);
704 
705         return len < PAGE_SIZE ? len : -EINVAL;
706 }
707 
708 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
709                              const char *buf, size_t len)
710 {
711         struct rps_map *old_map, *map;
712         cpumask_var_t mask;
713         int err, cpu, i;
714         static DEFINE_MUTEX(rps_map_mutex);
715 
716         if (!capable(CAP_NET_ADMIN))
717                 return -EPERM;
718 
719         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
720                 return -ENOMEM;
721 
722         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
723         if (err) {
724                 free_cpumask_var(mask);
725                 return err;
726         }
727 
728         map = kzalloc(max_t(unsigned int,
729                             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
730                       GFP_KERNEL);
731         if (!map) {
732                 free_cpumask_var(mask);
733                 return -ENOMEM;
734         }
735 
736         i = 0;
737         for_each_cpu_and(cpu, mask, cpu_online_mask)
738                 map->cpus[i++] = cpu;
739 
740         if (i) {
741                 map->len = i;
742         } else {
743                 kfree(map);
744                 map = NULL;
745         }
746 
747         mutex_lock(&rps_map_mutex);
748         old_map = rcu_dereference_protected(queue->rps_map,
749                                             mutex_is_locked(&rps_map_mutex));
750         rcu_assign_pointer(queue->rps_map, map);
751 
752         if (map)
753                 static_branch_inc(&rps_needed);
754         if (old_map)
755                 static_branch_dec(&rps_needed);
756 
757         mutex_unlock(&rps_map_mutex);
758 
759         if (old_map)
760                 kfree_rcu(old_map, rcu);
761 
762         free_cpumask_var(mask);
763         return len;
764 }
765 
766 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
767                                            char *buf)
768 {
769         struct rps_dev_flow_table *flow_table;
770         unsigned long val = 0;
771 
772         rcu_read_lock();
773         flow_table = rcu_dereference(queue->rps_flow_table);
774         if (flow_table)
775                 val = (unsigned long)flow_table->mask + 1;
776         rcu_read_unlock();
777 
778         return sprintf(buf, "%lu\n", val);
779 }
780 
781 static void rps_dev_flow_table_release(struct rcu_head *rcu)
782 {
783         struct rps_dev_flow_table *table = container_of(rcu,
784             struct rps_dev_flow_table, rcu);
785         vfree(table);
786 }
787 
788 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
789                                             const char *buf, size_t len)
790 {
791         unsigned long mask, count;
792         struct rps_dev_flow_table *table, *old_table;
793         static DEFINE_SPINLOCK(rps_dev_flow_lock);
794         int rc;
795 
796         if (!capable(CAP_NET_ADMIN))
797                 return -EPERM;
798 
799         rc = kstrtoul(buf, 0, &count);
800         if (rc < 0)
801                 return rc;
802 
803         if (count) {
804                 mask = count - 1;
805                 /* mask = roundup_pow_of_two(count) - 1;
806                  * without overflows...
807                  */
808                 while ((mask | (mask >> 1)) != mask)
809                         mask |= (mask >> 1);
810                 /* On 64 bit arches, must check mask fits in table->mask (u32),
811                  * and on 32bit arches, must check
812                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
813                  */
814 #if BITS_PER_LONG > 32
815                 if (mask > (unsigned long)(u32)mask)
816                         return -EINVAL;
817 #else
818                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
819                                 / sizeof(struct rps_dev_flow)) {
820                         /* Enforce a limit to prevent overflow */
821                         return -EINVAL;
822                 }
823 #endif
824                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
825                 if (!table)
826                         return -ENOMEM;
827 
828                 table->mask = mask;
829                 for (count = 0; count <= mask; count++)
830                         table->flows[count].cpu = RPS_NO_CPU;
831         } else {
832                 table = NULL;
833         }
834 
835         spin_lock(&rps_dev_flow_lock);
836         old_table = rcu_dereference_protected(queue->rps_flow_table,
837                                               lockdep_is_held(&rps_dev_flow_lock));
838         rcu_assign_pointer(queue->rps_flow_table, table);
839         spin_unlock(&rps_dev_flow_lock);
840 
841         if (old_table)
842                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
843 
844         return len;
845 }
846 
847 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
848         = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
849 
850 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
851         = __ATTR(rps_flow_cnt, 0644,
852                  show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
853 #endif /* CONFIG_RPS */
854 
855 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
856 #ifdef CONFIG_RPS
857         &rps_cpus_attribute.attr,
858         &rps_dev_flow_table_cnt_attribute.attr,
859 #endif
860         NULL
861 };
862 ATTRIBUTE_GROUPS(rx_queue_default);
863 
864 static void rx_queue_release(struct kobject *kobj)
865 {
866         struct netdev_rx_queue *queue = to_rx_queue(kobj);
867 #ifdef CONFIG_RPS
868         struct rps_map *map;
869         struct rps_dev_flow_table *flow_table;
870 
871         map = rcu_dereference_protected(queue->rps_map, 1);
872         if (map) {
873                 RCU_INIT_POINTER(queue->rps_map, NULL);
874                 kfree_rcu(map, rcu);
875         }
876 
877         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
878         if (flow_table) {
879                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
880                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
881         }
882 #endif
883 
884         memset(kobj, 0, sizeof(*kobj));
885         dev_put(queue->dev);
886 }
887 
888 static const void *rx_queue_namespace(struct kobject *kobj)
889 {
890         struct netdev_rx_queue *queue = to_rx_queue(kobj);
891         struct device *dev = &queue->dev->dev;
892         const void *ns = NULL;
893 
894         if (dev->class && dev->class->ns_type)
895                 ns = dev->class->namespace(dev);
896 
897         return ns;
898 }
899 
900 static void rx_queue_get_ownership(struct kobject *kobj,
901                                    kuid_t *uid, kgid_t *gid)
902 {
903         const struct net *net = rx_queue_namespace(kobj);
904 
905         net_ns_get_ownership(net, uid, gid);
906 }
907 
908 static struct kobj_type rx_queue_ktype __ro_after_init = {
909         .sysfs_ops = &rx_queue_sysfs_ops,
910         .release = rx_queue_release,
911         .default_groups = rx_queue_default_groups,
912         .namespace = rx_queue_namespace,
913         .get_ownership = rx_queue_get_ownership,
914 };
915 
916 static int rx_queue_add_kobject(struct net_device *dev, int index)
917 {
918         struct netdev_rx_queue *queue = dev->_rx + index;
919         struct kobject *kobj = &queue->kobj;
920         int error = 0;
921 
922         kobj->kset = dev->queues_kset;
923         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
924                                      "rx-%u", index);
925         if (error)
926                 return error;
927 
928         dev_hold(queue->dev);
929 
930         if (dev->sysfs_rx_queue_group) {
931                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
932                 if (error) {
933                         kobject_put(kobj);
934                         return error;
935                 }
936         }
937 
938         kobject_uevent(kobj, KOBJ_ADD);
939 
940         return error;
941 }
942 #endif /* CONFIG_SYSFS */
943 
944 int
945 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
946 {
947 #ifdef CONFIG_SYSFS
948         int i;
949         int error = 0;
950 
951 #ifndef CONFIG_RPS
952         if (!dev->sysfs_rx_queue_group)
953                 return 0;
954 #endif
955         for (i = old_num; i < new_num; i++) {
956                 error = rx_queue_add_kobject(dev, i);
957                 if (error) {
958                         new_num = old_num;
959                         break;
960                 }
961         }
962 
963         while (--i >= new_num) {
964                 struct kobject *kobj = &dev->_rx[i].kobj;
965 
966                 if (!refcount_read(&dev_net(dev)->count))
967                         kobj->uevent_suppress = 1;
968                 if (dev->sysfs_rx_queue_group)
969                         sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
970                 kobject_put(kobj);
971         }
972 
973         return error;
974 #else
975         return 0;
976 #endif
977 }
978 
979 #ifdef CONFIG_SYSFS
980 /*
981  * netdev_queue sysfs structures and functions.
982  */
983 struct netdev_queue_attribute {
984         struct attribute attr;
985         ssize_t (*show)(struct netdev_queue *queue, char *buf);
986         ssize_t (*store)(struct netdev_queue *queue,
987                          const char *buf, size_t len);
988 };
989 #define to_netdev_queue_attr(_attr) \
990         container_of(_attr, struct netdev_queue_attribute, attr)
991 
992 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
993 
994 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
995                                       struct attribute *attr, char *buf)
996 {
997         const struct netdev_queue_attribute *attribute
998                 = to_netdev_queue_attr(attr);
999         struct netdev_queue *queue = to_netdev_queue(kobj);
1000 
1001         if (!attribute->show)
1002                 return -EIO;
1003 
1004         return attribute->show(queue, buf);
1005 }
1006 
1007 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1008                                        struct attribute *attr,
1009                                        const char *buf, size_t count)
1010 {
1011         const struct netdev_queue_attribute *attribute
1012                 = to_netdev_queue_attr(attr);
1013         struct netdev_queue *queue = to_netdev_queue(kobj);
1014 
1015         if (!attribute->store)
1016                 return -EIO;
1017 
1018         return attribute->store(queue, buf, count);
1019 }
1020 
1021 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1022         .show = netdev_queue_attr_show,
1023         .store = netdev_queue_attr_store,
1024 };
1025 
1026 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1027 {
1028         unsigned long trans_timeout;
1029 
1030         spin_lock_irq(&queue->_xmit_lock);
1031         trans_timeout = queue->trans_timeout;
1032         spin_unlock_irq(&queue->_xmit_lock);
1033 
1034         return sprintf(buf, "%lu", trans_timeout);
1035 }
1036 
1037 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1038 {
1039         struct net_device *dev = queue->dev;
1040         unsigned int i;
1041 
1042         i = queue - dev->_tx;
1043         BUG_ON(i >= dev->num_tx_queues);
1044 
1045         return i;
1046 }
1047 
1048 static ssize_t traffic_class_show(struct netdev_queue *queue,
1049                                   char *buf)
1050 {
1051         struct net_device *dev = queue->dev;
1052         int index;
1053         int tc;
1054 
1055         if (!netif_is_multiqueue(dev))
1056                 return -ENOENT;
1057 
1058         index = get_netdev_queue_index(queue);
1059 
1060         /* If queue belongs to subordinate dev use its TC mapping */
1061         dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1062 
1063         tc = netdev_txq_to_tc(dev, index);
1064         if (tc < 0)
1065                 return -EINVAL;
1066 
1067         /* We can report the traffic class one of two ways:
1068          * Subordinate device traffic classes are reported with the traffic
1069          * class first, and then the subordinate class so for example TC0 on
1070          * subordinate device 2 will be reported as "0-2". If the queue
1071          * belongs to the root device it will be reported with just the
1072          * traffic class, so just "" for TC 0 for example.
1073          */
1074         return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1075                                  sprintf(buf, "%u\n", tc);
1076 }
1077 
1078 #ifdef CONFIG_XPS
1079 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1080                                char *buf)
1081 {
1082         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1083 }
1084 
1085 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1086                                 const char *buf, size_t len)
1087 {
1088         struct net_device *dev = queue->dev;
1089         int err, index = get_netdev_queue_index(queue);
1090         u32 rate = 0;
1091 
1092         if (!capable(CAP_NET_ADMIN))
1093                 return -EPERM;
1094 
1095         err = kstrtou32(buf, 10, &rate);
1096         if (err < 0)
1097                 return err;
1098 
1099         if (!rtnl_trylock())
1100                 return restart_syscall();
1101 
1102         err = -EOPNOTSUPP;
1103         if (dev->netdev_ops->ndo_set_tx_maxrate)
1104                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1105 
1106         rtnl_unlock();
1107         if (!err) {
1108                 queue->tx_maxrate = rate;
1109                 return len;
1110         }
1111         return err;
1112 }
1113 
1114 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1115         = __ATTR_RW(tx_maxrate);
1116 #endif
1117 
1118 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1119         = __ATTR_RO(tx_timeout);
1120 
1121 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1122         = __ATTR_RO(traffic_class);
1123 
1124 #ifdef CONFIG_BQL
1125 /*
1126  * Byte queue limits sysfs structures and functions.
1127  */
1128 static ssize_t bql_show(char *buf, unsigned int value)
1129 {
1130         return sprintf(buf, "%u\n", value);
1131 }
1132 
1133 static ssize_t bql_set(const char *buf, const size_t count,
1134                        unsigned int *pvalue)
1135 {
1136         unsigned int value;
1137         int err;
1138 
1139         if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1140                 value = DQL_MAX_LIMIT;
1141         } else {
1142                 err = kstrtouint(buf, 10, &value);
1143                 if (err < 0)
1144                         return err;
1145                 if (value > DQL_MAX_LIMIT)
1146                         return -EINVAL;
1147         }
1148 
1149         *pvalue = value;
1150 
1151         return count;
1152 }
1153 
1154 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1155                                   char *buf)
1156 {
1157         struct dql *dql = &queue->dql;
1158 
1159         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1160 }
1161 
1162 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1163                                  const char *buf, size_t len)
1164 {
1165         struct dql *dql = &queue->dql;
1166         unsigned int value;
1167         int err;
1168 
1169         err = kstrtouint(buf, 10, &value);
1170         if (err < 0)
1171                 return err;
1172 
1173         dql->slack_hold_time = msecs_to_jiffies(value);
1174 
1175         return len;
1176 }
1177 
1178 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1179         = __ATTR(hold_time, 0644,
1180                  bql_show_hold_time, bql_set_hold_time);
1181 
1182 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1183                                  char *buf)
1184 {
1185         struct dql *dql = &queue->dql;
1186 
1187         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1188 }
1189 
1190 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1191         __ATTR(inflight, 0444, bql_show_inflight, NULL);
1192 
1193 #define BQL_ATTR(NAME, FIELD)                                           \
1194 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1195                                  char *buf)                             \
1196 {                                                                       \
1197         return bql_show(buf, queue->dql.FIELD);                         \
1198 }                                                                       \
1199                                                                         \
1200 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1201                                 const char *buf, size_t len)            \
1202 {                                                                       \
1203         return bql_set(buf, len, &queue->dql.FIELD);                    \
1204 }                                                                       \
1205                                                                         \
1206 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1207         = __ATTR(NAME, 0644,                            \
1208                  bql_show_ ## NAME, bql_set_ ## NAME)
1209 
1210 BQL_ATTR(limit, limit);
1211 BQL_ATTR(limit_max, max_limit);
1212 BQL_ATTR(limit_min, min_limit);
1213 
1214 static struct attribute *dql_attrs[] __ro_after_init = {
1215         &bql_limit_attribute.attr,
1216         &bql_limit_max_attribute.attr,
1217         &bql_limit_min_attribute.attr,
1218         &bql_hold_time_attribute.attr,
1219         &bql_inflight_attribute.attr,
1220         NULL
1221 };
1222 
1223 static const struct attribute_group dql_group = {
1224         .name  = "byte_queue_limits",
1225         .attrs  = dql_attrs,
1226 };
1227 #endif /* CONFIG_BQL */
1228 
1229 #ifdef CONFIG_XPS
1230 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1231                              char *buf)
1232 {
1233         struct net_device *dev = queue->dev;
1234         int cpu, len, num_tc = 1, tc = 0;
1235         struct xps_dev_maps *dev_maps;
1236         cpumask_var_t mask;
1237         unsigned long index;
1238 
1239         if (!netif_is_multiqueue(dev))
1240                 return -ENOENT;
1241 
1242         index = get_netdev_queue_index(queue);
1243 
1244         if (dev->num_tc) {
1245                 /* Do not allow XPS on subordinate device directly */
1246                 num_tc = dev->num_tc;
1247                 if (num_tc < 0)
1248                         return -EINVAL;
1249 
1250                 /* If queue belongs to subordinate dev use its map */
1251                 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1252 
1253                 tc = netdev_txq_to_tc(dev, index);
1254                 if (tc < 0)
1255                         return -EINVAL;
1256         }
1257 
1258         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1259                 return -ENOMEM;
1260 
1261         rcu_read_lock();
1262         dev_maps = rcu_dereference(dev->xps_cpus_map);
1263         if (dev_maps) {
1264                 for_each_possible_cpu(cpu) {
1265                         int i, tci = cpu * num_tc + tc;
1266                         struct xps_map *map;
1267 
1268                         map = rcu_dereference(dev_maps->attr_map[tci]);
1269                         if (!map)
1270                                 continue;
1271 
1272                         for (i = map->len; i--;) {
1273                                 if (map->queues[i] == index) {
1274                                         cpumask_set_cpu(cpu, mask);
1275                                         break;
1276                                 }
1277                         }
1278                 }
1279         }
1280         rcu_read_unlock();
1281 
1282         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1283         free_cpumask_var(mask);
1284         return len < PAGE_SIZE ? len : -EINVAL;
1285 }
1286 
1287 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1288                               const char *buf, size_t len)
1289 {
1290         struct net_device *dev = queue->dev;
1291         unsigned long index;
1292         cpumask_var_t mask;
1293         int err;
1294 
1295         if (!netif_is_multiqueue(dev))
1296                 return -ENOENT;
1297 
1298         if (!capable(CAP_NET_ADMIN))
1299                 return -EPERM;
1300 
1301         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1302                 return -ENOMEM;
1303 
1304         index = get_netdev_queue_index(queue);
1305 
1306         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1307         if (err) {
1308                 free_cpumask_var(mask);
1309                 return err;
1310         }
1311 
1312         err = netif_set_xps_queue(dev, mask, index);
1313 
1314         free_cpumask_var(mask);
1315 
1316         return err ? : len;
1317 }
1318 
1319 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1320         = __ATTR_RW(xps_cpus);
1321 
1322 static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1323 {
1324         struct net_device *dev = queue->dev;
1325         struct xps_dev_maps *dev_maps;
1326         unsigned long *mask, index;
1327         int j, len, num_tc = 1, tc = 0;
1328 
1329         index = get_netdev_queue_index(queue);
1330 
1331         if (dev->num_tc) {
1332                 num_tc = dev->num_tc;
1333                 tc = netdev_txq_to_tc(dev, index);
1334                 if (tc < 0)
1335                         return -EINVAL;
1336         }
1337         mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1338         if (!mask)
1339                 return -ENOMEM;
1340 
1341         rcu_read_lock();
1342         dev_maps = rcu_dereference(dev->xps_rxqs_map);
1343         if (!dev_maps)
1344                 goto out_no_maps;
1345 
1346         for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1347              j < dev->num_rx_queues;) {
1348                 int i, tci = j * num_tc + tc;
1349                 struct xps_map *map;
1350 
1351                 map = rcu_dereference(dev_maps->attr_map[tci]);
1352                 if (!map)
1353                         continue;
1354 
1355                 for (i = map->len; i--;) {
1356                         if (map->queues[i] == index) {
1357                                 set_bit(j, mask);
1358                                 break;
1359                         }
1360                 }
1361         }
1362 out_no_maps:
1363         rcu_read_unlock();
1364 
1365         len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1366         bitmap_free(mask);
1367 
1368         return len < PAGE_SIZE ? len : -EINVAL;
1369 }
1370 
1371 static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1372                               size_t len)
1373 {
1374         struct net_device *dev = queue->dev;
1375         struct net *net = dev_net(dev);
1376         unsigned long *mask, index;
1377         int err;
1378 
1379         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1380                 return -EPERM;
1381 
1382         mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1383         if (!mask)
1384                 return -ENOMEM;
1385 
1386         index = get_netdev_queue_index(queue);
1387 
1388         err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1389         if (err) {
1390                 bitmap_free(mask);
1391                 return err;
1392         }
1393 
1394         cpus_read_lock();
1395         err = __netif_set_xps_queue(dev, mask, index, true);
1396         cpus_read_unlock();
1397 
1398         bitmap_free(mask);
1399         return err ? : len;
1400 }
1401 
1402 static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1403         = __ATTR_RW(xps_rxqs);
1404 #endif /* CONFIG_XPS */
1405 
1406 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1407         &queue_trans_timeout.attr,
1408         &queue_traffic_class.attr,
1409 #ifdef CONFIG_XPS
1410         &xps_cpus_attribute.attr,
1411         &xps_rxqs_attribute.attr,
1412         &queue_tx_maxrate.attr,
1413 #endif
1414         NULL
1415 };
1416 ATTRIBUTE_GROUPS(netdev_queue_default);
1417 
1418 static void netdev_queue_release(struct kobject *kobj)
1419 {
1420         struct netdev_queue *queue = to_netdev_queue(kobj);
1421 
1422         memset(kobj, 0, sizeof(*kobj));
1423         dev_put(queue->dev);
1424 }
1425 
1426 static const void *netdev_queue_namespace(struct kobject *kobj)
1427 {
1428         struct netdev_queue *queue = to_netdev_queue(kobj);
1429         struct device *dev = &queue->dev->dev;
1430         const void *ns = NULL;
1431 
1432         if (dev->class && dev->class->ns_type)
1433                 ns = dev->class->namespace(dev);
1434 
1435         return ns;
1436 }
1437 
1438 static void netdev_queue_get_ownership(struct kobject *kobj,
1439                                        kuid_t *uid, kgid_t *gid)
1440 {
1441         const struct net *net = netdev_queue_namespace(kobj);
1442 
1443         net_ns_get_ownership(net, uid, gid);
1444 }
1445 
1446 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1447         .sysfs_ops = &netdev_queue_sysfs_ops,
1448         .release = netdev_queue_release,
1449         .default_groups = netdev_queue_default_groups,
1450         .namespace = netdev_queue_namespace,
1451         .get_ownership = netdev_queue_get_ownership,
1452 };
1453 
1454 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1455 {
1456         struct netdev_queue *queue = dev->_tx + index;
1457         struct kobject *kobj = &queue->kobj;
1458         int error = 0;
1459 
1460         kobj->kset = dev->queues_kset;
1461         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1462                                      "tx-%u", index);
1463         if (error)
1464                 return error;
1465 
1466         dev_hold(queue->dev);
1467 
1468 #ifdef CONFIG_BQL
1469         error = sysfs_create_group(kobj, &dql_group);
1470         if (error) {
1471                 kobject_put(kobj);
1472                 return error;
1473         }
1474 #endif
1475 
1476         kobject_uevent(kobj, KOBJ_ADD);
1477 
1478         return 0;
1479 }
1480 #endif /* CONFIG_SYSFS */
1481 
1482 int
1483 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1484 {
1485 #ifdef CONFIG_SYSFS
1486         int i;
1487         int error = 0;
1488 
1489         for (i = old_num; i < new_num; i++) {
1490                 error = netdev_queue_add_kobject(dev, i);
1491                 if (error) {
1492                         new_num = old_num;
1493                         break;
1494                 }
1495         }
1496 
1497         while (--i >= new_num) {
1498                 struct netdev_queue *queue = dev->_tx + i;
1499 
1500                 if (!refcount_read(&dev_net(dev)->count))
1501                         queue->kobj.uevent_suppress = 1;
1502 #ifdef CONFIG_BQL
1503                 sysfs_remove_group(&queue->kobj, &dql_group);
1504 #endif
1505                 kobject_put(&queue->kobj);
1506         }
1507 
1508         return error;
1509 #else
1510         return 0;
1511 #endif /* CONFIG_SYSFS */
1512 }
1513 
1514 static int register_queue_kobjects(struct net_device *dev)
1515 {
1516         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1517 
1518 #ifdef CONFIG_SYSFS
1519         dev->queues_kset = kset_create_and_add("queues",
1520                                                NULL, &dev->dev.kobj);
1521         if (!dev->queues_kset)
1522                 return -ENOMEM;
1523         real_rx = dev->real_num_rx_queues;
1524 #endif
1525         real_tx = dev->real_num_tx_queues;
1526 
1527         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1528         if (error)
1529                 goto error;
1530         rxq = real_rx;
1531 
1532         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1533         if (error)
1534                 goto error;
1535         txq = real_tx;
1536 
1537         return 0;
1538 
1539 error:
1540         netdev_queue_update_kobjects(dev, txq, 0);
1541         net_rx_queue_update_kobjects(dev, rxq, 0);
1542 #ifdef CONFIG_SYSFS
1543         kset_unregister(dev->queues_kset);
1544 #endif
1545         return error;
1546 }
1547 
1548 static void remove_queue_kobjects(struct net_device *dev)
1549 {
1550         int real_rx = 0, real_tx = 0;
1551 
1552 #ifdef CONFIG_SYSFS
1553         real_rx = dev->real_num_rx_queues;
1554 #endif
1555         real_tx = dev->real_num_tx_queues;
1556 
1557         net_rx_queue_update_kobjects(dev, real_rx, 0);
1558         netdev_queue_update_kobjects(dev, real_tx, 0);
1559 #ifdef CONFIG_SYSFS
1560         kset_unregister(dev->queues_kset);
1561 #endif
1562 }
1563 
1564 static bool net_current_may_mount(void)
1565 {
1566         struct net *net = current->nsproxy->net_ns;
1567 
1568         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1569 }
1570 
1571 static void *net_grab_current_ns(void)
1572 {
1573         struct net *ns = current->nsproxy->net_ns;
1574 #ifdef CONFIG_NET_NS
1575         if (ns)
1576                 refcount_inc(&ns->passive);
1577 #endif
1578         return ns;
1579 }
1580 
1581 static const void *net_initial_ns(void)
1582 {
1583         return &init_net;
1584 }
1585 
1586 static const void *net_netlink_ns(struct sock *sk)
1587 {
1588         return sock_net(sk);
1589 }
1590 
1591 const struct kobj_ns_type_operations net_ns_type_operations = {
1592         .type = KOBJ_NS_TYPE_NET,
1593         .current_may_mount = net_current_may_mount,
1594         .grab_current_ns = net_grab_current_ns,
1595         .netlink_ns = net_netlink_ns,
1596         .initial_ns = net_initial_ns,
1597         .drop_ns = net_drop_ns,
1598 };
1599 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1600 
1601 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1602 {
1603         struct net_device *dev = to_net_dev(d);
1604         int retval;
1605 
1606         /* pass interface to uevent. */
1607         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1608         if (retval)
1609                 goto exit;
1610 
1611         /* pass ifindex to uevent.
1612          * ifindex is useful as it won't change (interface name may change)
1613          * and is what RtNetlink uses natively.
1614          */
1615         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1616 
1617 exit:
1618         return retval;
1619 }
1620 
1621 /*
1622  *      netdev_release -- destroy and free a dead device.
1623  *      Called when last reference to device kobject is gone.
1624  */
1625 static void netdev_release(struct device *d)
1626 {
1627         struct net_device *dev = to_net_dev(d);
1628 
1629         BUG_ON(dev->reg_state != NETREG_RELEASED);
1630 
1631         /* no need to wait for rcu grace period:
1632          * device is dead and about to be freed.
1633          */
1634         kfree(rcu_access_pointer(dev->ifalias));
1635         netdev_freemem(dev);
1636 }
1637 
1638 static const void *net_namespace(struct device *d)
1639 {
1640         struct net_device *dev = to_net_dev(d);
1641 
1642         return dev_net(dev);
1643 }
1644 
1645 static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1646 {
1647         struct net_device *dev = to_net_dev(d);
1648         const struct net *net = dev_net(dev);
1649 
1650         net_ns_get_ownership(net, uid, gid);
1651 }
1652 
1653 static struct class net_class __ro_after_init = {
1654         .name = "net",
1655         .dev_release = netdev_release,
1656         .dev_groups = net_class_groups,
1657         .dev_uevent = netdev_uevent,
1658         .ns_type = &net_ns_type_operations,
1659         .namespace = net_namespace,
1660         .get_ownership = net_get_ownership,
1661 };
1662 
1663 #ifdef CONFIG_OF_NET
1664 static int of_dev_node_match(struct device *dev, const void *data)
1665 {
1666         int ret = 0;
1667 
1668         if (dev->parent)
1669                 ret = dev->parent->of_node == data;
1670 
1671         return ret == 0 ? dev->of_node == data : ret;
1672 }
1673 
1674 /*
1675  * of_find_net_device_by_node - lookup the net device for the device node
1676  * @np: OF device node
1677  *
1678  * Looks up the net_device structure corresponding with the device node.
1679  * If successful, returns a pointer to the net_device with the embedded
1680  * struct device refcount incremented by one, or NULL on failure. The
1681  * refcount must be dropped when done with the net_device.
1682  */
1683 struct net_device *of_find_net_device_by_node(struct device_node *np)
1684 {
1685         struct device *dev;
1686 
1687         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1688         if (!dev)
1689                 return NULL;
1690 
1691         return to_net_dev(dev);
1692 }
1693 EXPORT_SYMBOL(of_find_net_device_by_node);
1694 #endif
1695 
1696 /* Delete sysfs entries but hold kobject reference until after all
1697  * netdev references are gone.
1698  */
1699 void netdev_unregister_kobject(struct net_device *ndev)
1700 {
1701         struct device *dev = &ndev->dev;
1702 
1703         if (!refcount_read(&dev_net(ndev)->count))
1704                 dev_set_uevent_suppress(dev, 1);
1705 
1706         kobject_get(&dev->kobj);
1707 
1708         remove_queue_kobjects(ndev);
1709 
1710         pm_runtime_set_memalloc_noio(dev, false);
1711 
1712         device_del(dev);
1713 }
1714 
1715 /* Create sysfs entries for network device. */
1716 int netdev_register_kobject(struct net_device *ndev)
1717 {
1718         struct device *dev = &ndev->dev;
1719         const struct attribute_group **groups = ndev->sysfs_groups;
1720         int error = 0;
1721 
1722         device_initialize(dev);
1723         dev->class = &net_class;
1724         dev->platform_data = ndev;
1725         dev->groups = groups;
1726 
1727         dev_set_name(dev, "%s", ndev->name);
1728 
1729 #ifdef CONFIG_SYSFS
1730         /* Allow for a device specific group */
1731         if (*groups)
1732                 groups++;
1733 
1734         *groups++ = &netstat_group;
1735 
1736 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1737         if (ndev->ieee80211_ptr)
1738                 *groups++ = &wireless_group;
1739 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1740         else if (ndev->wireless_handlers)
1741                 *groups++ = &wireless_group;
1742 #endif
1743 #endif
1744 #endif /* CONFIG_SYSFS */
1745 
1746         error = device_add(dev);
1747         if (error)
1748                 return error;
1749 
1750         error = register_queue_kobjects(ndev);
1751         if (error) {
1752                 device_del(dev);
1753                 return error;
1754         }
1755 
1756         pm_runtime_set_memalloc_noio(dev, true);
1757 
1758         return error;
1759 }
1760 
1761 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1762                                 const void *ns)
1763 {
1764         return class_create_file_ns(&net_class, class_attr, ns);
1765 }
1766 EXPORT_SYMBOL(netdev_class_create_file_ns);
1767 
1768 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1769                                  const void *ns)
1770 {
1771         class_remove_file_ns(&net_class, class_attr, ns);
1772 }
1773 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1774 
1775 int __init netdev_kobject_init(void)
1776 {
1777         kobj_ns_type_register(&net_ns_type_operations);
1778         return class_register(&net_class);
1779 }
1780 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp