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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/wireless.h>
22#include <linux/vmalloc.h>
23#include <linux/export.h>
24#include <linux/jiffies.h>
25#include <net/wext.h>
26
27#include "net-sysfs.h"
28
29#ifdef CONFIG_SYSFS
30static const char fmt_hex[] = "%#x\n";
31static const char fmt_long_hex[] = "%#lx\n";
32static const char fmt_dec[] = "%d\n";
33static const char fmt_udec[] = "%u\n";
34static const char fmt_ulong[] = "%lu\n";
35static const char fmt_u64[] = "%llu\n";
36
37static inline int dev_isalive(const struct net_device *dev)
38{
39 return dev->reg_state <= NETREG_REGISTERED;
40}
41
42
43static ssize_t netdev_show(const struct device *dev,
44 struct device_attribute *attr, char *buf,
45 ssize_t (*format)(const struct net_device *, char *))
46{
47 struct net_device *net = to_net_dev(dev);
48 ssize_t ret = -EINVAL;
49
50 read_lock(&dev_base_lock);
51 if (dev_isalive(net))
52 ret = (*format)(net, buf);
53 read_unlock(&dev_base_lock);
54
55 return ret;
56}
57
58
59#define NETDEVICE_SHOW(field, format_string) \
60static ssize_t format_##field(const struct net_device *net, char *buf) \
61{ \
62 return sprintf(buf, format_string, net->field); \
63} \
64static ssize_t show_##field(struct device *dev, \
65 struct device_attribute *attr, char *buf) \
66{ \
67 return netdev_show(dev, attr, buf, format_##field); \
68}
69
70
71
72static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
73 const char *buf, size_t len,
74 int (*set)(struct net_device *, unsigned long))
75{
76 struct net_device *net = to_net_dev(dev);
77 char *endp;
78 unsigned long new;
79 int ret = -EINVAL;
80
81 if (!capable(CAP_NET_ADMIN))
82 return -EPERM;
83
84 new = simple_strtoul(buf, &endp, 0);
85 if (endp == buf)
86 goto err;
87
88 if (!rtnl_trylock())
89 return restart_syscall();
90
91 if (dev_isalive(net)) {
92 if ((ret = (*set)(net, new)) == 0)
93 ret = len;
94 }
95 rtnl_unlock();
96 err:
97 return ret;
98}
99
100NETDEVICE_SHOW(dev_id, fmt_hex);
101NETDEVICE_SHOW(addr_assign_type, fmt_dec);
102NETDEVICE_SHOW(addr_len, fmt_dec);
103NETDEVICE_SHOW(iflink, fmt_dec);
104NETDEVICE_SHOW(ifindex, fmt_dec);
105NETDEVICE_SHOW(type, fmt_dec);
106NETDEVICE_SHOW(link_mode, fmt_dec);
107
108
109static ssize_t show_address(struct device *dev, struct device_attribute *attr,
110 char *buf)
111{
112 struct net_device *net = to_net_dev(dev);
113 ssize_t ret = -EINVAL;
114
115 read_lock(&dev_base_lock);
116 if (dev_isalive(net))
117 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
118 read_unlock(&dev_base_lock);
119 return ret;
120}
121
122static ssize_t show_broadcast(struct device *dev,
123 struct device_attribute *attr, char *buf)
124{
125 struct net_device *net = to_net_dev(dev);
126 if (dev_isalive(net))
127 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
128 return -EINVAL;
129}
130
131static ssize_t show_carrier(struct device *dev,
132 struct device_attribute *attr, char *buf)
133{
134 struct net_device *netdev = to_net_dev(dev);
135 if (netif_running(netdev)) {
136 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
137 }
138 return -EINVAL;
139}
140
141static ssize_t show_speed(struct device *dev,
142 struct device_attribute *attr, char *buf)
143{
144 struct net_device *netdev = to_net_dev(dev);
145 int ret = -EINVAL;
146
147 if (!rtnl_trylock())
148 return restart_syscall();
149
150 if (netif_running(netdev)) {
151 struct ethtool_cmd cmd;
152 if (!__ethtool_get_settings(netdev, &cmd))
153 ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
154 }
155 rtnl_unlock();
156 return ret;
157}
158
159static ssize_t show_duplex(struct device *dev,
160 struct device_attribute *attr, char *buf)
161{
162 struct net_device *netdev = to_net_dev(dev);
163 int ret = -EINVAL;
164
165 if (!rtnl_trylock())
166 return restart_syscall();
167
168 if (netif_running(netdev)) {
169 struct ethtool_cmd cmd;
170 if (!__ethtool_get_settings(netdev, &cmd))
171 ret = sprintf(buf, "%s\n",
172 cmd.duplex ? "full" : "half");
173 }
174 rtnl_unlock();
175 return ret;
176}
177
178static ssize_t show_dormant(struct device *dev,
179 struct device_attribute *attr, char *buf)
180{
181 struct net_device *netdev = to_net_dev(dev);
182
183 if (netif_running(netdev))
184 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
185
186 return -EINVAL;
187}
188
189static const char *const operstates[] = {
190 "unknown",
191 "notpresent",
192 "down",
193 "lowerlayerdown",
194 "testing",
195 "dormant",
196 "up"
197};
198
199static ssize_t show_operstate(struct device *dev,
200 struct device_attribute *attr, char *buf)
201{
202 const struct net_device *netdev = to_net_dev(dev);
203 unsigned char operstate;
204
205 read_lock(&dev_base_lock);
206 operstate = netdev->operstate;
207 if (!netif_running(netdev))
208 operstate = IF_OPER_DOWN;
209 read_unlock(&dev_base_lock);
210
211 if (operstate >= ARRAY_SIZE(operstates))
212 return -EINVAL;
213
214 return sprintf(buf, "%s\n", operstates[operstate]);
215}
216
217
218NETDEVICE_SHOW(mtu, fmt_dec);
219
220static int change_mtu(struct net_device *net, unsigned long new_mtu)
221{
222 return dev_set_mtu(net, (int) new_mtu);
223}
224
225static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
226 const char *buf, size_t len)
227{
228 return netdev_store(dev, attr, buf, len, change_mtu);
229}
230
231NETDEVICE_SHOW(flags, fmt_hex);
232
233static int change_flags(struct net_device *net, unsigned long new_flags)
234{
235 return dev_change_flags(net, (unsigned) new_flags);
236}
237
238static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
239 const char *buf, size_t len)
240{
241 return netdev_store(dev, attr, buf, len, change_flags);
242}
243
244NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
245
246static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
247{
248 net->tx_queue_len = new_len;
249 return 0;
250}
251
252static ssize_t store_tx_queue_len(struct device *dev,
253 struct device_attribute *attr,
254 const char *buf, size_t len)
255{
256 return netdev_store(dev, attr, buf, len, change_tx_queue_len);
257}
258
259static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
260 const char *buf, size_t len)
261{
262 struct net_device *netdev = to_net_dev(dev);
263 size_t count = len;
264 ssize_t ret;
265
266 if (!capable(CAP_NET_ADMIN))
267 return -EPERM;
268
269
270 if (len > 0 && buf[len - 1] == '\n')
271 --count;
272
273 if (!rtnl_trylock())
274 return restart_syscall();
275 ret = dev_set_alias(netdev, buf, count);
276 rtnl_unlock();
277
278 return ret < 0 ? ret : len;
279}
280
281static ssize_t show_ifalias(struct device *dev,
282 struct device_attribute *attr, char *buf)
283{
284 const struct net_device *netdev = to_net_dev(dev);
285 ssize_t ret = 0;
286
287 if (!rtnl_trylock())
288 return restart_syscall();
289 if (netdev->ifalias)
290 ret = sprintf(buf, "%s\n", netdev->ifalias);
291 rtnl_unlock();
292 return ret;
293}
294
295NETDEVICE_SHOW(group, fmt_dec);
296
297static int change_group(struct net_device *net, unsigned long new_group)
298{
299 dev_set_group(net, (int) new_group);
300 return 0;
301}
302
303static ssize_t store_group(struct device *dev, struct device_attribute *attr,
304 const char *buf, size_t len)
305{
306 return netdev_store(dev, attr, buf, len, change_group);
307}
308
309static struct device_attribute net_class_attributes[] = {
310 __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
311 __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
312 __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
313 __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
314 __ATTR(iflink, S_IRUGO, show_iflink, NULL),
315 __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
316 __ATTR(type, S_IRUGO, show_type, NULL),
317 __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
318 __ATTR(address, S_IRUGO, show_address, NULL),
319 __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
320 __ATTR(carrier, S_IRUGO, show_carrier, NULL),
321 __ATTR(speed, S_IRUGO, show_speed, NULL),
322 __ATTR(duplex, S_IRUGO, show_duplex, NULL),
323 __ATTR(dormant, S_IRUGO, show_dormant, NULL),
324 __ATTR(operstate, S_IRUGO, show_operstate, NULL),
325 __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
326 __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
327 __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
328 store_tx_queue_len),
329 __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
330 {}
331};
332
333
334static ssize_t netstat_show(const struct device *d,
335 struct device_attribute *attr, char *buf,
336 unsigned long offset)
337{
338 struct net_device *dev = to_net_dev(d);
339 ssize_t ret = -EINVAL;
340
341 WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
342 offset % sizeof(u64) != 0);
343
344 read_lock(&dev_base_lock);
345 if (dev_isalive(dev)) {
346 struct rtnl_link_stats64 temp;
347 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
348
349 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
350 }
351 read_unlock(&dev_base_lock);
352 return ret;
353}
354
355
356#define NETSTAT_ENTRY(name) \
357static ssize_t show_##name(struct device *d, \
358 struct device_attribute *attr, char *buf) \
359{ \
360 return netstat_show(d, attr, buf, \
361 offsetof(struct rtnl_link_stats64, name)); \
362} \
363static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
364
365NETSTAT_ENTRY(rx_packets);
366NETSTAT_ENTRY(tx_packets);
367NETSTAT_ENTRY(rx_bytes);
368NETSTAT_ENTRY(tx_bytes);
369NETSTAT_ENTRY(rx_errors);
370NETSTAT_ENTRY(tx_errors);
371NETSTAT_ENTRY(rx_dropped);
372NETSTAT_ENTRY(tx_dropped);
373NETSTAT_ENTRY(multicast);
374NETSTAT_ENTRY(collisions);
375NETSTAT_ENTRY(rx_length_errors);
376NETSTAT_ENTRY(rx_over_errors);
377NETSTAT_ENTRY(rx_crc_errors);
378NETSTAT_ENTRY(rx_frame_errors);
379NETSTAT_ENTRY(rx_fifo_errors);
380NETSTAT_ENTRY(rx_missed_errors);
381NETSTAT_ENTRY(tx_aborted_errors);
382NETSTAT_ENTRY(tx_carrier_errors);
383NETSTAT_ENTRY(tx_fifo_errors);
384NETSTAT_ENTRY(tx_heartbeat_errors);
385NETSTAT_ENTRY(tx_window_errors);
386NETSTAT_ENTRY(rx_compressed);
387NETSTAT_ENTRY(tx_compressed);
388
389static struct attribute *netstat_attrs[] = {
390 &dev_attr_rx_packets.attr,
391 &dev_attr_tx_packets.attr,
392 &dev_attr_rx_bytes.attr,
393 &dev_attr_tx_bytes.attr,
394 &dev_attr_rx_errors.attr,
395 &dev_attr_tx_errors.attr,
396 &dev_attr_rx_dropped.attr,
397 &dev_attr_tx_dropped.attr,
398 &dev_attr_multicast.attr,
399 &dev_attr_collisions.attr,
400 &dev_attr_rx_length_errors.attr,
401 &dev_attr_rx_over_errors.attr,
402 &dev_attr_rx_crc_errors.attr,
403 &dev_attr_rx_frame_errors.attr,
404 &dev_attr_rx_fifo_errors.attr,
405 &dev_attr_rx_missed_errors.attr,
406 &dev_attr_tx_aborted_errors.attr,
407 &dev_attr_tx_carrier_errors.attr,
408 &dev_attr_tx_fifo_errors.attr,
409 &dev_attr_tx_heartbeat_errors.attr,
410 &dev_attr_tx_window_errors.attr,
411 &dev_attr_rx_compressed.attr,
412 &dev_attr_tx_compressed.attr,
413 NULL
414};
415
416
417static struct attribute_group netstat_group = {
418 .name = "statistics",
419 .attrs = netstat_attrs,
420};
421
422#ifdef CONFIG_WIRELESS_EXT_SYSFS
423
424static ssize_t wireless_show(struct device *d, char *buf,
425 ssize_t (*format)(const struct iw_statistics *,
426 char *))
427{
428 struct net_device *dev = to_net_dev(d);
429 const struct iw_statistics *iw;
430 ssize_t ret = -EINVAL;
431
432 if (!rtnl_trylock())
433 return restart_syscall();
434 if (dev_isalive(dev)) {
435 iw = get_wireless_stats(dev);
436 if (iw)
437 ret = (*format)(iw, buf);
438 }
439 rtnl_unlock();
440
441 return ret;
442}
443
444
445#define WIRELESS_SHOW(name, field, format_string) \
446static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
447{ \
448 return sprintf(buf, format_string, iw->field); \
449} \
450static ssize_t show_iw_##name(struct device *d, \
451 struct device_attribute *attr, char *buf) \
452{ \
453 return wireless_show(d, buf, format_iw_##name); \
454} \
455static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
456
457WIRELESS_SHOW(status, status, fmt_hex);
458WIRELESS_SHOW(link, qual.qual, fmt_dec);
459WIRELESS_SHOW(level, qual.level, fmt_dec);
460WIRELESS_SHOW(noise, qual.noise, fmt_dec);
461WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
462WIRELESS_SHOW(crypt, discard.code, fmt_dec);
463WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
464WIRELESS_SHOW(misc, discard.misc, fmt_dec);
465WIRELESS_SHOW(retries, discard.retries, fmt_dec);
466WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
467
468static struct attribute *wireless_attrs[] = {
469 &dev_attr_status.attr,
470 &dev_attr_link.attr,
471 &dev_attr_level.attr,
472 &dev_attr_noise.attr,
473 &dev_attr_nwid.attr,
474 &dev_attr_crypt.attr,
475 &dev_attr_fragment.attr,
476 &dev_attr_retries.attr,
477 &dev_attr_misc.attr,
478 &dev_attr_beacon.attr,
479 NULL
480};
481
482static struct attribute_group wireless_group = {
483 .name = "wireless",
484 .attrs = wireless_attrs,
485};
486#endif
487#endif
488
489#ifdef CONFIG_RPS
490
491
492
493struct rx_queue_attribute {
494 struct attribute attr;
495 ssize_t (*show)(struct netdev_rx_queue *queue,
496 struct rx_queue_attribute *attr, char *buf);
497 ssize_t (*store)(struct netdev_rx_queue *queue,
498 struct rx_queue_attribute *attr, const char *buf, size_t len);
499};
500#define to_rx_queue_attr(_attr) container_of(_attr, \
501 struct rx_queue_attribute, attr)
502
503#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
504
505static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
506 char *buf)
507{
508 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
509 struct netdev_rx_queue *queue = to_rx_queue(kobj);
510
511 if (!attribute->show)
512 return -EIO;
513
514 return attribute->show(queue, attribute, buf);
515}
516
517static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
518 const char *buf, size_t count)
519{
520 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
521 struct netdev_rx_queue *queue = to_rx_queue(kobj);
522
523 if (!attribute->store)
524 return -EIO;
525
526 return attribute->store(queue, attribute, buf, count);
527}
528
529static const struct sysfs_ops rx_queue_sysfs_ops = {
530 .show = rx_queue_attr_show,
531 .store = rx_queue_attr_store,
532};
533
534static ssize_t show_rps_map(struct netdev_rx_queue *queue,
535 struct rx_queue_attribute *attribute, char *buf)
536{
537 struct rps_map *map;
538 cpumask_var_t mask;
539 size_t len = 0;
540 int i;
541
542 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
543 return -ENOMEM;
544
545 rcu_read_lock();
546 map = rcu_dereference(queue->rps_map);
547 if (map)
548 for (i = 0; i < map->len; i++)
549 cpumask_set_cpu(map->cpus[i], mask);
550
551 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
552 if (PAGE_SIZE - len < 3) {
553 rcu_read_unlock();
554 free_cpumask_var(mask);
555 return -EINVAL;
556 }
557 rcu_read_unlock();
558
559 free_cpumask_var(mask);
560 len += sprintf(buf + len, "\n");
561 return len;
562}
563
564static ssize_t store_rps_map(struct netdev_rx_queue *queue,
565 struct rx_queue_attribute *attribute,
566 const char *buf, size_t len)
567{
568 struct rps_map *old_map, *map;
569 cpumask_var_t mask;
570 int err, cpu, i;
571 static DEFINE_SPINLOCK(rps_map_lock);
572
573 if (!capable(CAP_NET_ADMIN))
574 return -EPERM;
575
576 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
577 return -ENOMEM;
578
579 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
580 if (err) {
581 free_cpumask_var(mask);
582 return err;
583 }
584
585 map = kzalloc(max_t(unsigned,
586 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
587 GFP_KERNEL);
588 if (!map) {
589 free_cpumask_var(mask);
590 return -ENOMEM;
591 }
592
593 i = 0;
594 for_each_cpu_and(cpu, mask, cpu_online_mask)
595 map->cpus[i++] = cpu;
596
597 if (i)
598 map->len = i;
599 else {
600 kfree(map);
601 map = NULL;
602 }
603
604 spin_lock(&rps_map_lock);
605 old_map = rcu_dereference_protected(queue->rps_map,
606 lockdep_is_held(&rps_map_lock));
607 rcu_assign_pointer(queue->rps_map, map);
608 spin_unlock(&rps_map_lock);
609
610 if (map)
611 jump_label_inc(&rps_needed);
612 if (old_map) {
613 kfree_rcu(old_map, rcu);
614 jump_label_dec(&rps_needed);
615 }
616 free_cpumask_var(mask);
617 return len;
618}
619
620static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
621 struct rx_queue_attribute *attr,
622 char *buf)
623{
624 struct rps_dev_flow_table *flow_table;
625 unsigned long val = 0;
626
627 rcu_read_lock();
628 flow_table = rcu_dereference(queue->rps_flow_table);
629 if (flow_table)
630 val = (unsigned long)flow_table->mask + 1;
631 rcu_read_unlock();
632
633 return sprintf(buf, "%lu\n", val);
634}
635
636static void rps_dev_flow_table_release_work(struct work_struct *work)
637{
638 struct rps_dev_flow_table *table = container_of(work,
639 struct rps_dev_flow_table, free_work);
640
641 vfree(table);
642}
643
644static void rps_dev_flow_table_release(struct rcu_head *rcu)
645{
646 struct rps_dev_flow_table *table = container_of(rcu,
647 struct rps_dev_flow_table, rcu);
648
649 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
650 schedule_work(&table->free_work);
651}
652
653static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
654 struct rx_queue_attribute *attr,
655 const char *buf, size_t len)
656{
657 unsigned long mask, count;
658 struct rps_dev_flow_table *table, *old_table;
659 static DEFINE_SPINLOCK(rps_dev_flow_lock);
660 int rc;
661
662 if (!capable(CAP_NET_ADMIN))
663 return -EPERM;
664
665 rc = kstrtoul(buf, 0, &count);
666 if (rc < 0)
667 return rc;
668
669 if (count) {
670 mask = count - 1;
671
672
673
674 while ((mask | (mask >> 1)) != mask)
675 mask |= (mask >> 1);
676
677
678
679
680#if BITS_PER_LONG > 32
681 if (mask > (unsigned long)(u32)mask)
682 return -EINVAL;
683#else
684 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
685 / sizeof(struct rps_dev_flow)) {
686
687 return -EINVAL;
688 }
689#endif
690 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
691 if (!table)
692 return -ENOMEM;
693
694 table->mask = mask;
695 for (count = 0; count <= mask; count++)
696 table->flows[count].cpu = RPS_NO_CPU;
697 } else
698 table = NULL;
699
700 spin_lock(&rps_dev_flow_lock);
701 old_table = rcu_dereference_protected(queue->rps_flow_table,
702 lockdep_is_held(&rps_dev_flow_lock));
703 rcu_assign_pointer(queue->rps_flow_table, table);
704 spin_unlock(&rps_dev_flow_lock);
705
706 if (old_table)
707 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
708
709 return len;
710}
711
712static struct rx_queue_attribute rps_cpus_attribute =
713 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
714
715
716static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
717 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
718 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
719
720static struct attribute *rx_queue_default_attrs[] = {
721 &rps_cpus_attribute.attr,
722 &rps_dev_flow_table_cnt_attribute.attr,
723 NULL
724};
725
726static void rx_queue_release(struct kobject *kobj)
727{
728 struct netdev_rx_queue *queue = to_rx_queue(kobj);
729 struct rps_map *map;
730 struct rps_dev_flow_table *flow_table;
731
732
733 map = rcu_dereference_protected(queue->rps_map, 1);
734 if (map) {
735 RCU_INIT_POINTER(queue->rps_map, NULL);
736 kfree_rcu(map, rcu);
737 }
738
739 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
740 if (flow_table) {
741 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
742 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
743 }
744
745 memset(kobj, 0, sizeof(*kobj));
746 dev_put(queue->dev);
747}
748
749static struct kobj_type rx_queue_ktype = {
750 .sysfs_ops = &rx_queue_sysfs_ops,
751 .release = rx_queue_release,
752 .default_attrs = rx_queue_default_attrs,
753};
754
755static int rx_queue_add_kobject(struct net_device *net, int index)
756{
757 struct netdev_rx_queue *queue = net->_rx + index;
758 struct kobject *kobj = &queue->kobj;
759 int error = 0;
760
761 kobj->kset = net->queues_kset;
762 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
763 "rx-%u", index);
764 if (error) {
765 kobject_put(kobj);
766 return error;
767 }
768
769 kobject_uevent(kobj, KOBJ_ADD);
770 dev_hold(queue->dev);
771
772 return error;
773}
774#endif
775
776int
777net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
778{
779#ifdef CONFIG_RPS
780 int i;
781 int error = 0;
782
783 for (i = old_num; i < new_num; i++) {
784 error = rx_queue_add_kobject(net, i);
785 if (error) {
786 new_num = old_num;
787 break;
788 }
789 }
790
791 while (--i >= new_num)
792 kobject_put(&net->_rx[i].kobj);
793
794 return error;
795#else
796 return 0;
797#endif
798}
799
800#ifdef CONFIG_SYSFS
801
802
803
804struct netdev_queue_attribute {
805 struct attribute attr;
806 ssize_t (*show)(struct netdev_queue *queue,
807 struct netdev_queue_attribute *attr, char *buf);
808 ssize_t (*store)(struct netdev_queue *queue,
809 struct netdev_queue_attribute *attr, const char *buf, size_t len);
810};
811#define to_netdev_queue_attr(_attr) container_of(_attr, \
812 struct netdev_queue_attribute, attr)
813
814#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
815
816static ssize_t netdev_queue_attr_show(struct kobject *kobj,
817 struct attribute *attr, char *buf)
818{
819 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
820 struct netdev_queue *queue = to_netdev_queue(kobj);
821
822 if (!attribute->show)
823 return -EIO;
824
825 return attribute->show(queue, attribute, buf);
826}
827
828static ssize_t netdev_queue_attr_store(struct kobject *kobj,
829 struct attribute *attr,
830 const char *buf, size_t count)
831{
832 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
833 struct netdev_queue *queue = to_netdev_queue(kobj);
834
835 if (!attribute->store)
836 return -EIO;
837
838 return attribute->store(queue, attribute, buf, count);
839}
840
841static const struct sysfs_ops netdev_queue_sysfs_ops = {
842 .show = netdev_queue_attr_show,
843 .store = netdev_queue_attr_store,
844};
845
846static ssize_t show_trans_timeout(struct netdev_queue *queue,
847 struct netdev_queue_attribute *attribute,
848 char *buf)
849{
850 unsigned long trans_timeout;
851
852 spin_lock_irq(&queue->_xmit_lock);
853 trans_timeout = queue->trans_timeout;
854 spin_unlock_irq(&queue->_xmit_lock);
855
856 return sprintf(buf, "%lu", trans_timeout);
857}
858
859static struct netdev_queue_attribute queue_trans_timeout =
860 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
861
862#ifdef CONFIG_BQL
863
864
865
866static ssize_t bql_show(char *buf, unsigned int value)
867{
868 return sprintf(buf, "%u\n", value);
869}
870
871static ssize_t bql_set(const char *buf, const size_t count,
872 unsigned int *pvalue)
873{
874 unsigned int value;
875 int err;
876
877 if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
878 value = DQL_MAX_LIMIT;
879 else {
880 err = kstrtouint(buf, 10, &value);
881 if (err < 0)
882 return err;
883 if (value > DQL_MAX_LIMIT)
884 return -EINVAL;
885 }
886
887 *pvalue = value;
888
889 return count;
890}
891
892static ssize_t bql_show_hold_time(struct netdev_queue *queue,
893 struct netdev_queue_attribute *attr,
894 char *buf)
895{
896 struct dql *dql = &queue->dql;
897
898 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
899}
900
901static ssize_t bql_set_hold_time(struct netdev_queue *queue,
902 struct netdev_queue_attribute *attribute,
903 const char *buf, size_t len)
904{
905 struct dql *dql = &queue->dql;
906 unsigned value;
907 int err;
908
909 err = kstrtouint(buf, 10, &value);
910 if (err < 0)
911 return err;
912
913 dql->slack_hold_time = msecs_to_jiffies(value);
914
915 return len;
916}
917
918static struct netdev_queue_attribute bql_hold_time_attribute =
919 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
920 bql_set_hold_time);
921
922static ssize_t bql_show_inflight(struct netdev_queue *queue,
923 struct netdev_queue_attribute *attr,
924 char *buf)
925{
926 struct dql *dql = &queue->dql;
927
928 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
929}
930
931static struct netdev_queue_attribute bql_inflight_attribute =
932 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
933
934#define BQL_ATTR(NAME, FIELD) \
935static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
936 struct netdev_queue_attribute *attr, \
937 char *buf) \
938{ \
939 return bql_show(buf, queue->dql.FIELD); \
940} \
941 \
942static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
943 struct netdev_queue_attribute *attr, \
944 const char *buf, size_t len) \
945{ \
946 return bql_set(buf, len, &queue->dql.FIELD); \
947} \
948 \
949static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \
950 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \
951 bql_set_ ## NAME);
952
953BQL_ATTR(limit, limit)
954BQL_ATTR(limit_max, max_limit)
955BQL_ATTR(limit_min, min_limit)
956
957static struct attribute *dql_attrs[] = {
958 &bql_limit_attribute.attr,
959 &bql_limit_max_attribute.attr,
960 &bql_limit_min_attribute.attr,
961 &bql_hold_time_attribute.attr,
962 &bql_inflight_attribute.attr,
963 NULL
964};
965
966static struct attribute_group dql_group = {
967 .name = "byte_queue_limits",
968 .attrs = dql_attrs,
969};
970#endif
971
972#ifdef CONFIG_XPS
973static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
974{
975 struct net_device *dev = queue->dev;
976 int i;
977
978 for (i = 0; i < dev->num_tx_queues; i++)
979 if (queue == &dev->_tx[i])
980 break;
981
982 BUG_ON(i >= dev->num_tx_queues);
983
984 return i;
985}
986
987
988static ssize_t show_xps_map(struct netdev_queue *queue,
989 struct netdev_queue_attribute *attribute, char *buf)
990{
991 struct net_device *dev = queue->dev;
992 struct xps_dev_maps *dev_maps;
993 cpumask_var_t mask;
994 unsigned long index;
995 size_t len = 0;
996 int i;
997
998 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
999 return -ENOMEM;
1000
1001 index = get_netdev_queue_index(queue);
1002
1003 rcu_read_lock();
1004 dev_maps = rcu_dereference(dev->xps_maps);
1005 if (dev_maps) {
1006 for_each_possible_cpu(i) {
1007 struct xps_map *map =
1008 rcu_dereference(dev_maps->cpu_map[i]);
1009 if (map) {
1010 int j;
1011 for (j = 0; j < map->len; j++) {
1012 if (map->queues[j] == index) {
1013 cpumask_set_cpu(i, mask);
1014 break;
1015 }
1016 }
1017 }
1018 }
1019 }
1020 rcu_read_unlock();
1021
1022 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
1023 if (PAGE_SIZE - len < 3) {
1024 free_cpumask_var(mask);
1025 return -EINVAL;
1026 }
1027
1028 free_cpumask_var(mask);
1029 len += sprintf(buf + len, "\n");
1030 return len;
1031}
1032
1033static DEFINE_MUTEX(xps_map_mutex);
1034#define xmap_dereference(P) \
1035 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1036
1037static void xps_queue_release(struct netdev_queue *queue)
1038{
1039 struct net_device *dev = queue->dev;
1040 struct xps_dev_maps *dev_maps;
1041 struct xps_map *map;
1042 unsigned long index;
1043 int i, pos, nonempty = 0;
1044
1045 index = get_netdev_queue_index(queue);
1046
1047 mutex_lock(&xps_map_mutex);
1048 dev_maps = xmap_dereference(dev->xps_maps);
1049
1050 if (dev_maps) {
1051 for_each_possible_cpu(i) {
1052 map = xmap_dereference(dev_maps->cpu_map[i]);
1053 if (!map)
1054 continue;
1055
1056 for (pos = 0; pos < map->len; pos++)
1057 if (map->queues[pos] == index)
1058 break;
1059
1060 if (pos < map->len) {
1061 if (map->len > 1)
1062 map->queues[pos] =
1063 map->queues[--map->len];
1064 else {
1065 RCU_INIT_POINTER(dev_maps->cpu_map[i],
1066 NULL);
1067 kfree_rcu(map, rcu);
1068 map = NULL;
1069 }
1070 }
1071 if (map)
1072 nonempty = 1;
1073 }
1074
1075 if (!nonempty) {
1076 RCU_INIT_POINTER(dev->xps_maps, NULL);
1077 kfree_rcu(dev_maps, rcu);
1078 }
1079 }
1080 mutex_unlock(&xps_map_mutex);
1081}
1082
1083static ssize_t store_xps_map(struct netdev_queue *queue,
1084 struct netdev_queue_attribute *attribute,
1085 const char *buf, size_t len)
1086{
1087 struct net_device *dev = queue->dev;
1088 cpumask_var_t mask;
1089 int err, i, cpu, pos, map_len, alloc_len, need_set;
1090 unsigned long index;
1091 struct xps_map *map, *new_map;
1092 struct xps_dev_maps *dev_maps, *new_dev_maps;
1093 int nonempty = 0;
1094 int numa_node_id = -2;
1095
1096 if (!capable(CAP_NET_ADMIN))
1097 return -EPERM;
1098
1099 if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1100 return -ENOMEM;
1101
1102 index = get_netdev_queue_index(queue);
1103
1104 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1105 if (err) {
1106 free_cpumask_var(mask);
1107 return err;
1108 }
1109
1110 new_dev_maps = kzalloc(max_t(unsigned,
1111 XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
1112 if (!new_dev_maps) {
1113 free_cpumask_var(mask);
1114 return -ENOMEM;
1115 }
1116
1117 mutex_lock(&xps_map_mutex);
1118
1119 dev_maps = xmap_dereference(dev->xps_maps);
1120
1121 for_each_possible_cpu(cpu) {
1122 map = dev_maps ?
1123 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
1124 new_map = map;
1125 if (map) {
1126 for (pos = 0; pos < map->len; pos++)
1127 if (map->queues[pos] == index)
1128 break;
1129 map_len = map->len;
1130 alloc_len = map->alloc_len;
1131 } else
1132 pos = map_len = alloc_len = 0;
1133
1134 need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu);
1135#ifdef CONFIG_NUMA
1136 if (need_set) {
1137 if (numa_node_id == -2)
1138 numa_node_id = cpu_to_node(cpu);
1139 else if (numa_node_id != cpu_to_node(cpu))
1140 numa_node_id = -1;
1141 }
1142#endif
1143 if (need_set && pos >= map_len) {
1144
1145 if (map_len >= alloc_len) {
1146 alloc_len = alloc_len ?
1147 2 * alloc_len : XPS_MIN_MAP_ALLOC;
1148 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
1149 GFP_KERNEL,
1150 cpu_to_node(cpu));
1151 if (!new_map)
1152 goto error;
1153 new_map->alloc_len = alloc_len;
1154 for (i = 0; i < map_len; i++)
1155 new_map->queues[i] = map->queues[i];
1156 new_map->len = map_len;
1157 }
1158 new_map->queues[new_map->len++] = index;
1159 } else if (!need_set && pos < map_len) {
1160
1161 if (map_len > 1)
1162 new_map->queues[pos] =
1163 new_map->queues[--new_map->len];
1164 else
1165 new_map = NULL;
1166 }
1167 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
1168 }
1169
1170
1171 for_each_possible_cpu(cpu) {
1172 map = dev_maps ?
1173 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
1174 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
1175 kfree_rcu(map, rcu);
1176 if (new_dev_maps->cpu_map[cpu])
1177 nonempty = 1;
1178 }
1179
1180 if (nonempty) {
1181 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
1182 } else {
1183 kfree(new_dev_maps);
1184 RCU_INIT_POINTER(dev->xps_maps, NULL);
1185 }
1186
1187 if (dev_maps)
1188 kfree_rcu(dev_maps, rcu);
1189
1190 netdev_queue_numa_node_write(queue, (numa_node_id >= 0) ? numa_node_id :
1191 NUMA_NO_NODE);
1192
1193 mutex_unlock(&xps_map_mutex);
1194
1195 free_cpumask_var(mask);
1196 return len;
1197
1198error:
1199 mutex_unlock(&xps_map_mutex);
1200
1201 if (new_dev_maps)
1202 for_each_possible_cpu(i)
1203 kfree(rcu_dereference_protected(
1204 new_dev_maps->cpu_map[i],
1205 1));
1206 kfree(new_dev_maps);
1207 free_cpumask_var(mask);
1208 return -ENOMEM;
1209}
1210
1211static struct netdev_queue_attribute xps_cpus_attribute =
1212 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1213#endif
1214
1215static struct attribute *netdev_queue_default_attrs[] = {
1216 &queue_trans_timeout.attr,
1217#ifdef CONFIG_XPS
1218 &xps_cpus_attribute.attr,
1219#endif
1220 NULL
1221};
1222
1223static void netdev_queue_release(struct kobject *kobj)
1224{
1225 struct netdev_queue *queue = to_netdev_queue(kobj);
1226
1227#ifdef CONFIG_XPS
1228 xps_queue_release(queue);
1229#endif
1230
1231 memset(kobj, 0, sizeof(*kobj));
1232 dev_put(queue->dev);
1233}
1234
1235static struct kobj_type netdev_queue_ktype = {
1236 .sysfs_ops = &netdev_queue_sysfs_ops,
1237 .release = netdev_queue_release,
1238 .default_attrs = netdev_queue_default_attrs,
1239};
1240
1241static int netdev_queue_add_kobject(struct net_device *net, int index)
1242{
1243 struct netdev_queue *queue = net->_tx + index;
1244 struct kobject *kobj = &queue->kobj;
1245 int error = 0;
1246
1247 kobj->kset = net->queues_kset;
1248 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1249 "tx-%u", index);
1250 if (error)
1251 goto exit;
1252
1253#ifdef CONFIG_BQL
1254 error = sysfs_create_group(kobj, &dql_group);
1255 if (error)
1256 goto exit;
1257#endif
1258
1259 kobject_uevent(kobj, KOBJ_ADD);
1260 dev_hold(queue->dev);
1261
1262 return 0;
1263exit:
1264 kobject_put(kobj);
1265 return error;
1266}
1267#endif
1268
1269int
1270netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1271{
1272#ifdef CONFIG_SYSFS
1273 int i;
1274 int error = 0;
1275
1276 for (i = old_num; i < new_num; i++) {
1277 error = netdev_queue_add_kobject(net, i);
1278 if (error) {
1279 new_num = old_num;
1280 break;
1281 }
1282 }
1283
1284 while (--i >= new_num) {
1285 struct netdev_queue *queue = net->_tx + i;
1286
1287#ifdef CONFIG_BQL
1288 sysfs_remove_group(&queue->kobj, &dql_group);
1289#endif
1290 kobject_put(&queue->kobj);
1291 }
1292
1293 return error;
1294#else
1295 return 0;
1296#endif
1297}
1298
1299static int register_queue_kobjects(struct net_device *net)
1300{
1301 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1302
1303#ifdef CONFIG_SYSFS
1304 net->queues_kset = kset_create_and_add("queues",
1305 NULL, &net->dev.kobj);
1306 if (!net->queues_kset)
1307 return -ENOMEM;
1308#endif
1309
1310#ifdef CONFIG_RPS
1311 real_rx = net->real_num_rx_queues;
1312#endif
1313 real_tx = net->real_num_tx_queues;
1314
1315 error = net_rx_queue_update_kobjects(net, 0, real_rx);
1316 if (error)
1317 goto error;
1318 rxq = real_rx;
1319
1320 error = netdev_queue_update_kobjects(net, 0, real_tx);
1321 if (error)
1322 goto error;
1323 txq = real_tx;
1324
1325 return 0;
1326
1327error:
1328 netdev_queue_update_kobjects(net, txq, 0);
1329 net_rx_queue_update_kobjects(net, rxq, 0);
1330 return error;
1331}
1332
1333static void remove_queue_kobjects(struct net_device *net)
1334{
1335 int real_rx = 0, real_tx = 0;
1336
1337#ifdef CONFIG_RPS
1338 real_rx = net->real_num_rx_queues;
1339#endif
1340 real_tx = net->real_num_tx_queues;
1341
1342 net_rx_queue_update_kobjects(net, real_rx, 0);
1343 netdev_queue_update_kobjects(net, real_tx, 0);
1344#ifdef CONFIG_SYSFS
1345 kset_unregister(net->queues_kset);
1346#endif
1347}
1348
1349static void *net_grab_current_ns(void)
1350{
1351 struct net *ns = current->nsproxy->net_ns;
1352#ifdef CONFIG_NET_NS
1353 if (ns)
1354 atomic_inc(&ns->passive);
1355#endif
1356 return ns;
1357}
1358
1359static const void *net_initial_ns(void)
1360{
1361 return &init_net;
1362}
1363
1364static const void *net_netlink_ns(struct sock *sk)
1365{
1366 return sock_net(sk);
1367}
1368
1369struct kobj_ns_type_operations net_ns_type_operations = {
1370 .type = KOBJ_NS_TYPE_NET,
1371 .grab_current_ns = net_grab_current_ns,
1372 .netlink_ns = net_netlink_ns,
1373 .initial_ns = net_initial_ns,
1374 .drop_ns = net_drop_ns,
1375};
1376EXPORT_SYMBOL_GPL(net_ns_type_operations);
1377
1378#ifdef CONFIG_HOTPLUG
1379static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1380{
1381 struct net_device *dev = to_net_dev(d);
1382 int retval;
1383
1384
1385 retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1386 if (retval)
1387 goto exit;
1388
1389
1390
1391
1392 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1393
1394exit:
1395 return retval;
1396}
1397#endif
1398
1399
1400
1401
1402
1403static void netdev_release(struct device *d)
1404{
1405 struct net_device *dev = to_net_dev(d);
1406
1407 BUG_ON(dev->reg_state != NETREG_RELEASED);
1408
1409 kfree(dev->ifalias);
1410 kfree((char *)dev - dev->padded);
1411}
1412
1413static const void *net_namespace(struct device *d)
1414{
1415 struct net_device *dev;
1416 dev = container_of(d, struct net_device, dev);
1417 return dev_net(dev);
1418}
1419
1420static struct class net_class = {
1421 .name = "net",
1422 .dev_release = netdev_release,
1423#ifdef CONFIG_SYSFS
1424 .dev_attrs = net_class_attributes,
1425#endif
1426#ifdef CONFIG_HOTPLUG
1427 .dev_uevent = netdev_uevent,
1428#endif
1429 .ns_type = &net_ns_type_operations,
1430 .namespace = net_namespace,
1431};
1432
1433
1434
1435
1436void netdev_unregister_kobject(struct net_device * net)
1437{
1438 struct device *dev = &(net->dev);
1439
1440 kobject_get(&dev->kobj);
1441
1442 remove_queue_kobjects(net);
1443
1444 device_del(dev);
1445}
1446
1447
1448int netdev_register_kobject(struct net_device *net)
1449{
1450 struct device *dev = &(net->dev);
1451 const struct attribute_group **groups = net->sysfs_groups;
1452 int error = 0;
1453
1454 device_initialize(dev);
1455 dev->class = &net_class;
1456 dev->platform_data = net;
1457 dev->groups = groups;
1458
1459 dev_set_name(dev, "%s", net->name);
1460
1461#ifdef CONFIG_SYSFS
1462
1463 if (*groups)
1464 groups++;
1465
1466 *groups++ = &netstat_group;
1467#ifdef CONFIG_WIRELESS_EXT_SYSFS
1468 if (net->ieee80211_ptr)
1469 *groups++ = &wireless_group;
1470#ifdef CONFIG_WIRELESS_EXT
1471 else if (net->wireless_handlers)
1472 *groups++ = &wireless_group;
1473#endif
1474#endif
1475#endif
1476
1477 error = device_add(dev);
1478 if (error)
1479 return error;
1480
1481 error = register_queue_kobjects(net);
1482 if (error) {
1483 device_del(dev);
1484 return error;
1485 }
1486
1487 return error;
1488}
1489
1490int netdev_class_create_file(struct class_attribute *class_attr)
1491{
1492 return class_create_file(&net_class, class_attr);
1493}
1494EXPORT_SYMBOL(netdev_class_create_file);
1495
1496void netdev_class_remove_file(struct class_attribute *class_attr)
1497{
1498 class_remove_file(&net_class, class_attr);
1499}
1500EXPORT_SYMBOL(netdev_class_remove_file);
1501
1502int netdev_kobject_init(void)
1503{
1504 kobj_ns_type_register(&net_ns_type_operations);
1505 return class_register(&net_class);
1506}
1507
