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