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14#include <linux/bitops.h>
15#include <linux/module.h>
16#include <linux/types.h>
17#include <linux/kernel.h>
18#include <linux/sched.h>
19#include <linux/string.h>
20#include <linux/errno.h>
21#include <linux/netdevice.h>
22#include <linux/skbuff.h>
23#include <linux/rtnetlink.h>
24#include <linux/init.h>
25#include <linux/rcupdate.h>
26#include <linux/list.h>
27#include <linux/slab.h>
28#include <linux/if_vlan.h>
29#include <net/sch_generic.h>
30#include <net/pkt_sched.h>
31#include <net/dst.h>
32
33
34const struct Qdisc_ops *default_qdisc_ops = &pfifo_fast_ops;
35EXPORT_SYMBOL(default_qdisc_ops);
36
37
38
39
40
41
42
43
44
45
46
47
48static inline int dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q)
49{
50 skb_dst_force(skb);
51 q->gso_skb = skb;
52 q->qstats.requeues++;
53 q->q.qlen++;
54 __netif_schedule(q);
55
56 return 0;
57}
58
59static inline struct sk_buff *dequeue_skb(struct Qdisc *q)
60{
61 struct sk_buff *skb = q->gso_skb;
62 const struct netdev_queue *txq = q->dev_queue;
63
64 if (unlikely(skb)) {
65
66 txq = netdev_get_tx_queue(txq->dev, skb_get_queue_mapping(skb));
67 if (!netif_xmit_frozen_or_stopped(txq)) {
68 q->gso_skb = NULL;
69 q->q.qlen--;
70 } else
71 skb = NULL;
72 } else {
73 if (!(q->flags & TCQ_F_ONETXQUEUE) || !netif_xmit_frozen_or_stopped(txq))
74 skb = q->dequeue(q);
75 }
76
77 return skb;
78}
79
80static inline int handle_dev_cpu_collision(struct sk_buff *skb,
81 struct netdev_queue *dev_queue,
82 struct Qdisc *q)
83{
84 int ret;
85
86 if (unlikely(dev_queue->xmit_lock_owner == smp_processor_id())) {
87
88
89
90
91
92
93 kfree_skb(skb);
94 net_warn_ratelimited("Dead loop on netdevice %s, fix it urgently!\n",
95 dev_queue->dev->name);
96 ret = qdisc_qlen(q);
97 } else {
98
99
100
101
102 __this_cpu_inc(softnet_data.cpu_collision);
103 ret = dev_requeue_skb(skb, q);
104 }
105
106 return ret;
107}
108
109
110
111
112
113
114
115
116
117
118int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
119 struct net_device *dev, struct netdev_queue *txq,
120 spinlock_t *root_lock)
121{
122 int ret = NETDEV_TX_BUSY;
123
124
125 spin_unlock(root_lock);
126
127 HARD_TX_LOCK(dev, txq, smp_processor_id());
128 if (!netif_xmit_frozen_or_stopped(txq))
129 ret = dev_hard_start_xmit(skb, dev, txq);
130
131 HARD_TX_UNLOCK(dev, txq);
132
133 spin_lock(root_lock);
134
135 if (dev_xmit_complete(ret)) {
136
137 ret = qdisc_qlen(q);
138 } else if (ret == NETDEV_TX_LOCKED) {
139
140 ret = handle_dev_cpu_collision(skb, txq, q);
141 } else {
142
143 if (unlikely(ret != NETDEV_TX_BUSY))
144 net_warn_ratelimited("BUG %s code %d qlen %d\n",
145 dev->name, ret, q->q.qlen);
146
147 ret = dev_requeue_skb(skb, q);
148 }
149
150 if (ret && netif_xmit_frozen_or_stopped(txq))
151 ret = 0;
152
153 return ret;
154}
155
156
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173
174
175static inline int qdisc_restart(struct Qdisc *q)
176{
177 struct netdev_queue *txq;
178 struct net_device *dev;
179 spinlock_t *root_lock;
180 struct sk_buff *skb;
181
182
183 skb = dequeue_skb(q);
184 if (unlikely(!skb))
185 return 0;
186 WARN_ON_ONCE(skb_dst_is_noref(skb));
187 root_lock = qdisc_lock(q);
188 dev = qdisc_dev(q);
189 txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
190
191 return sch_direct_xmit(skb, q, dev, txq, root_lock);
192}
193
194void __qdisc_run(struct Qdisc *q)
195{
196 int quota = weight_p;
197
198 while (qdisc_restart(q)) {
199
200
201
202
203
204 if (--quota <= 0 || need_resched()) {
205 __netif_schedule(q);
206 break;
207 }
208 }
209
210 qdisc_run_end(q);
211}
212
213unsigned long dev_trans_start(struct net_device *dev)
214{
215 unsigned long val, res;
216 unsigned int i;
217
218 if (is_vlan_dev(dev))
219 dev = vlan_dev_real_dev(dev);
220 res = dev->trans_start;
221 for (i = 0; i < dev->num_tx_queues; i++) {
222 val = netdev_get_tx_queue(dev, i)->trans_start;
223 if (val && time_after(val, res))
224 res = val;
225 }
226 dev->trans_start = res;
227
228 return res;
229}
230EXPORT_SYMBOL(dev_trans_start);
231
232static void dev_watchdog(unsigned long arg)
233{
234 struct net_device *dev = (struct net_device *)arg;
235
236 netif_tx_lock(dev);
237 if (!qdisc_tx_is_noop(dev)) {
238 if (netif_device_present(dev) &&
239 netif_running(dev) &&
240 netif_carrier_ok(dev)) {
241 int some_queue_timedout = 0;
242 unsigned int i;
243 unsigned long trans_start;
244
245 for (i = 0; i < dev->num_tx_queues; i++) {
246 struct netdev_queue *txq;
247
248 txq = netdev_get_tx_queue(dev, i);
249
250
251
252 trans_start = txq->trans_start ? : dev->trans_start;
253 if (netif_xmit_stopped(txq) &&
254 time_after(jiffies, (trans_start +
255 dev->watchdog_timeo))) {
256 some_queue_timedout = 1;
257 txq->trans_timeout++;
258 break;
259 }
260 }
261
262 if (some_queue_timedout) {
263 WARN_ONCE(1, KERN_INFO "NETDEV WATCHDOG: %s (%s): transmit queue %u timed out\n",
264 dev->name, netdev_drivername(dev), i);
265 dev->netdev_ops->ndo_tx_timeout(dev);
266 }
267 if (!mod_timer(&dev->watchdog_timer,
268 round_jiffies(jiffies +
269 dev->watchdog_timeo)))
270 dev_hold(dev);
271 }
272 }
273 netif_tx_unlock(dev);
274
275 dev_put(dev);
276}
277
278void __netdev_watchdog_up(struct net_device *dev)
279{
280 if (dev->netdev_ops->ndo_tx_timeout) {
281 if (dev->watchdog_timeo <= 0)
282 dev->watchdog_timeo = 5*HZ;
283 if (!mod_timer(&dev->watchdog_timer,
284 round_jiffies(jiffies + dev->watchdog_timeo)))
285 dev_hold(dev);
286 }
287}
288
289static void dev_watchdog_up(struct net_device *dev)
290{
291 __netdev_watchdog_up(dev);
292}
293
294static void dev_watchdog_down(struct net_device *dev)
295{
296 netif_tx_lock_bh(dev);
297 if (del_timer(&dev->watchdog_timer))
298 dev_put(dev);
299 netif_tx_unlock_bh(dev);
300}
301
302
303
304
305
306
307
308void netif_carrier_on(struct net_device *dev)
309{
310 if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) {
311 if (dev->reg_state == NETREG_UNINITIALIZED)
312 return;
313 atomic_inc(&dev->carrier_changes);
314 linkwatch_fire_event(dev);
315 if (netif_running(dev))
316 __netdev_watchdog_up(dev);
317 }
318}
319EXPORT_SYMBOL(netif_carrier_on);
320
321
322
323
324
325
326
327void netif_carrier_off(struct net_device *dev)
328{
329 if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) {
330 if (dev->reg_state == NETREG_UNINITIALIZED)
331 return;
332 atomic_inc(&dev->carrier_changes);
333 linkwatch_fire_event(dev);
334 }
335}
336EXPORT_SYMBOL(netif_carrier_off);
337
338
339
340
341
342
343static int noop_enqueue(struct sk_buff *skb, struct Qdisc *qdisc)
344{
345 kfree_skb(skb);
346 return NET_XMIT_CN;
347}
348
349static struct sk_buff *noop_dequeue(struct Qdisc *qdisc)
350{
351 return NULL;
352}
353
354struct Qdisc_ops noop_qdisc_ops __read_mostly = {
355 .id = "noop",
356 .priv_size = 0,
357 .enqueue = noop_enqueue,
358 .dequeue = noop_dequeue,
359 .peek = noop_dequeue,
360 .owner = THIS_MODULE,
361};
362
363static struct netdev_queue noop_netdev_queue = {
364 .qdisc = &noop_qdisc,
365 .qdisc_sleeping = &noop_qdisc,
366};
367
368struct Qdisc noop_qdisc = {
369 .enqueue = noop_enqueue,
370 .dequeue = noop_dequeue,
371 .flags = TCQ_F_BUILTIN,
372 .ops = &noop_qdisc_ops,
373 .list = LIST_HEAD_INIT(noop_qdisc.list),
374 .q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock),
375 .dev_queue = &noop_netdev_queue,
376 .busylock = __SPIN_LOCK_UNLOCKED(noop_qdisc.busylock),
377};
378EXPORT_SYMBOL(noop_qdisc);
379
380static struct Qdisc_ops noqueue_qdisc_ops __read_mostly = {
381 .id = "noqueue",
382 .priv_size = 0,
383 .enqueue = noop_enqueue,
384 .dequeue = noop_dequeue,
385 .peek = noop_dequeue,
386 .owner = THIS_MODULE,
387};
388
389static struct Qdisc noqueue_qdisc;
390static struct netdev_queue noqueue_netdev_queue = {
391 .qdisc = &noqueue_qdisc,
392 .qdisc_sleeping = &noqueue_qdisc,
393};
394
395static struct Qdisc noqueue_qdisc = {
396 .enqueue = NULL,
397 .dequeue = noop_dequeue,
398 .flags = TCQ_F_BUILTIN,
399 .ops = &noqueue_qdisc_ops,
400 .list = LIST_HEAD_INIT(noqueue_qdisc.list),
401 .q.lock = __SPIN_LOCK_UNLOCKED(noqueue_qdisc.q.lock),
402 .dev_queue = &noqueue_netdev_queue,
403 .busylock = __SPIN_LOCK_UNLOCKED(noqueue_qdisc.busylock),
404};
405
406
407static const u8 prio2band[TC_PRIO_MAX + 1] = {
408 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1
409};
410
411
412
413
414
415#define PFIFO_FAST_BANDS 3
416
417
418
419
420
421
422struct pfifo_fast_priv {
423 u32 bitmap;
424 struct sk_buff_head q[PFIFO_FAST_BANDS];
425};
426
427
428
429
430
431
432
433static const int bitmap2band[] = {-1, 0, 1, 0, 2, 0, 1, 0};
434
435static inline struct sk_buff_head *band2list(struct pfifo_fast_priv *priv,
436 int band)
437{
438 return priv->q + band;
439}
440
441static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc)
442{
443 if (skb_queue_len(&qdisc->q) < qdisc_dev(qdisc)->tx_queue_len) {
444 int band = prio2band[skb->priority & TC_PRIO_MAX];
445 struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
446 struct sk_buff_head *list = band2list(priv, band);
447
448 priv->bitmap |= (1 << band);
449 qdisc->q.qlen++;
450 return __qdisc_enqueue_tail(skb, qdisc, list);
451 }
452
453 return qdisc_drop(skb, qdisc);
454}
455
456static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc)
457{
458 struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
459 int band = bitmap2band[priv->bitmap];
460
461 if (likely(band >= 0)) {
462 struct sk_buff_head *list = band2list(priv, band);
463 struct sk_buff *skb = __qdisc_dequeue_head(qdisc, list);
464
465 qdisc->q.qlen--;
466 if (skb_queue_empty(list))
467 priv->bitmap &= ~(1 << band);
468
469 return skb;
470 }
471
472 return NULL;
473}
474
475static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc)
476{
477 struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
478 int band = bitmap2band[priv->bitmap];
479
480 if (band >= 0) {
481 struct sk_buff_head *list = band2list(priv, band);
482
483 return skb_peek(list);
484 }
485
486 return NULL;
487}
488
489static void pfifo_fast_reset(struct Qdisc *qdisc)
490{
491 int prio;
492 struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
493
494 for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
495 __qdisc_reset_queue(qdisc, band2list(priv, prio));
496
497 priv->bitmap = 0;
498 qdisc->qstats.backlog = 0;
499 qdisc->q.qlen = 0;
500}
501
502static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb)
503{
504 struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS };
505
506 memcpy(&opt.priomap, prio2band, TC_PRIO_MAX + 1);
507 if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
508 goto nla_put_failure;
509 return skb->len;
510
511nla_put_failure:
512 return -1;
513}
514
515static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt)
516{
517 int prio;
518 struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
519
520 for (prio = 0; prio < PFIFO_FAST_BANDS; prio++)
521 skb_queue_head_init(band2list(priv, prio));
522
523
524 qdisc->flags |= TCQ_F_CAN_BYPASS;
525 return 0;
526}
527
528struct Qdisc_ops pfifo_fast_ops __read_mostly = {
529 .id = "pfifo_fast",
530 .priv_size = sizeof(struct pfifo_fast_priv),
531 .enqueue = pfifo_fast_enqueue,
532 .dequeue = pfifo_fast_dequeue,
533 .peek = pfifo_fast_peek,
534 .init = pfifo_fast_init,
535 .reset = pfifo_fast_reset,
536 .dump = pfifo_fast_dump,
537 .owner = THIS_MODULE,
538};
539
540static struct lock_class_key qdisc_tx_busylock;
541
542struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
543 const struct Qdisc_ops *ops)
544{
545 void *p;
546 struct Qdisc *sch;
547 unsigned int size = QDISC_ALIGN(sizeof(*sch)) + ops->priv_size;
548 int err = -ENOBUFS;
549 struct net_device *dev = dev_queue->dev;
550
551 p = kzalloc_node(size, GFP_KERNEL,
552 netdev_queue_numa_node_read(dev_queue));
553
554 if (!p)
555 goto errout;
556 sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p);
557
558 if (sch != p) {
559 kfree(p);
560 p = kzalloc_node(size + QDISC_ALIGNTO - 1, GFP_KERNEL,
561 netdev_queue_numa_node_read(dev_queue));
562 if (!p)
563 goto errout;
564 sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p);
565 sch->padded = (char *) sch - (char *) p;
566 }
567 INIT_LIST_HEAD(&sch->list);
568 skb_queue_head_init(&sch->q);
569
570 spin_lock_init(&sch->busylock);
571 lockdep_set_class(&sch->busylock,
572 dev->qdisc_tx_busylock ?: &qdisc_tx_busylock);
573
574 sch->ops = ops;
575 sch->enqueue = ops->enqueue;
576 sch->dequeue = ops->dequeue;
577 sch->dev_queue = dev_queue;
578 dev_hold(dev);
579 atomic_set(&sch->refcnt, 1);
580
581 return sch;
582errout:
583 return ERR_PTR(err);
584}
585
586struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
587 const struct Qdisc_ops *ops,
588 unsigned int parentid)
589{
590 struct Qdisc *sch;
591
592 if (!try_module_get(ops->owner))
593 goto errout;
594
595 sch = qdisc_alloc(dev_queue, ops);
596 if (IS_ERR(sch))
597 goto errout;
598 sch->parent = parentid;
599
600 if (!ops->init || ops->init(sch, NULL) == 0)
601 return sch;
602
603 qdisc_destroy(sch);
604errout:
605 return NULL;
606}
607EXPORT_SYMBOL(qdisc_create_dflt);
608
609
610
611void qdisc_reset(struct Qdisc *qdisc)
612{
613 const struct Qdisc_ops *ops = qdisc->ops;
614
615 if (ops->reset)
616 ops->reset(qdisc);
617
618 if (qdisc->gso_skb) {
619 kfree_skb(qdisc->gso_skb);
620 qdisc->gso_skb = NULL;
621 qdisc->q.qlen = 0;
622 }
623}
624EXPORT_SYMBOL(qdisc_reset);
625
626static void qdisc_rcu_free(struct rcu_head *head)
627{
628 struct Qdisc *qdisc = container_of(head, struct Qdisc, rcu_head);
629
630 kfree((char *) qdisc - qdisc->padded);
631}
632
633void qdisc_destroy(struct Qdisc *qdisc)
634{
635 const struct Qdisc_ops *ops = qdisc->ops;
636
637 if (qdisc->flags & TCQ_F_BUILTIN ||
638 !atomic_dec_and_test(&qdisc->refcnt))
639 return;
640
641#ifdef CONFIG_NET_SCHED
642 qdisc_list_del(qdisc);
643
644 qdisc_put_stab(rtnl_dereference(qdisc->stab));
645#endif
646 gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est);
647 if (ops->reset)
648 ops->reset(qdisc);
649 if (ops->destroy)
650 ops->destroy(qdisc);
651
652 module_put(ops->owner);
653 dev_put(qdisc_dev(qdisc));
654
655 kfree_skb(qdisc->gso_skb);
656
657
658
659
660 call_rcu(&qdisc->rcu_head, qdisc_rcu_free);
661}
662EXPORT_SYMBOL(qdisc_destroy);
663
664
665struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
666 struct Qdisc *qdisc)
667{
668 struct Qdisc *oqdisc = dev_queue->qdisc_sleeping;
669 spinlock_t *root_lock;
670
671 root_lock = qdisc_lock(oqdisc);
672 spin_lock_bh(root_lock);
673
674
675 if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1)
676 qdisc_reset(oqdisc);
677
678
679 if (qdisc == NULL)
680 qdisc = &noop_qdisc;
681 dev_queue->qdisc_sleeping = qdisc;
682 rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc);
683
684 spin_unlock_bh(root_lock);
685
686 return oqdisc;
687}
688EXPORT_SYMBOL(dev_graft_qdisc);
689
690static void attach_one_default_qdisc(struct net_device *dev,
691 struct netdev_queue *dev_queue,
692 void *_unused)
693{
694 struct Qdisc *qdisc = &noqueue_qdisc;
695
696 if (dev->tx_queue_len) {
697 qdisc = qdisc_create_dflt(dev_queue,
698 default_qdisc_ops, TC_H_ROOT);
699 if (!qdisc) {
700 netdev_info(dev, "activation failed\n");
701 return;
702 }
703 if (!netif_is_multiqueue(dev))
704 qdisc->flags |= TCQ_F_ONETXQUEUE;
705 }
706 dev_queue->qdisc_sleeping = qdisc;
707}
708
709static void attach_default_qdiscs(struct net_device *dev)
710{
711 struct netdev_queue *txq;
712 struct Qdisc *qdisc;
713
714 txq = netdev_get_tx_queue(dev, 0);
715
716 if (!netif_is_multiqueue(dev) || dev->tx_queue_len == 0) {
717 netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL);
718 dev->qdisc = txq->qdisc_sleeping;
719 atomic_inc(&dev->qdisc->refcnt);
720 } else {
721 qdisc = qdisc_create_dflt(txq, &mq_qdisc_ops, TC_H_ROOT);
722 if (qdisc) {
723 dev->qdisc = qdisc;
724 qdisc->ops->attach(qdisc);
725 }
726 }
727}
728
729static void transition_one_qdisc(struct net_device *dev,
730 struct netdev_queue *dev_queue,
731 void *_need_watchdog)
732{
733 struct Qdisc *new_qdisc = dev_queue->qdisc_sleeping;
734 int *need_watchdog_p = _need_watchdog;
735
736 if (!(new_qdisc->flags & TCQ_F_BUILTIN))
737 clear_bit(__QDISC_STATE_DEACTIVATED, &new_qdisc->state);
738
739 rcu_assign_pointer(dev_queue->qdisc, new_qdisc);
740 if (need_watchdog_p && new_qdisc != &noqueue_qdisc) {
741 dev_queue->trans_start = 0;
742 *need_watchdog_p = 1;
743 }
744}
745
746void dev_activate(struct net_device *dev)
747{
748 int need_watchdog;
749
750
751
752
753
754
755 if (dev->qdisc == &noop_qdisc)
756 attach_default_qdiscs(dev);
757
758 if (!netif_carrier_ok(dev))
759
760 return;
761
762 need_watchdog = 0;
763 netdev_for_each_tx_queue(dev, transition_one_qdisc, &need_watchdog);
764 if (dev_ingress_queue(dev))
765 transition_one_qdisc(dev, dev_ingress_queue(dev), NULL);
766
767 if (need_watchdog) {
768 dev->trans_start = jiffies;
769 dev_watchdog_up(dev);
770 }
771}
772EXPORT_SYMBOL(dev_activate);
773
774static void dev_deactivate_queue(struct net_device *dev,
775 struct netdev_queue *dev_queue,
776 void *_qdisc_default)
777{
778 struct Qdisc *qdisc_default = _qdisc_default;
779 struct Qdisc *qdisc;
780
781 qdisc = dev_queue->qdisc;
782 if (qdisc) {
783 spin_lock_bh(qdisc_lock(qdisc));
784
785 if (!(qdisc->flags & TCQ_F_BUILTIN))
786 set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state);
787
788 rcu_assign_pointer(dev_queue->qdisc, qdisc_default);
789 qdisc_reset(qdisc);
790
791 spin_unlock_bh(qdisc_lock(qdisc));
792 }
793}
794
795static bool some_qdisc_is_busy(struct net_device *dev)
796{
797 unsigned int i;
798
799 for (i = 0; i < dev->num_tx_queues; i++) {
800 struct netdev_queue *dev_queue;
801 spinlock_t *root_lock;
802 struct Qdisc *q;
803 int val;
804
805 dev_queue = netdev_get_tx_queue(dev, i);
806 q = dev_queue->qdisc_sleeping;
807 root_lock = qdisc_lock(q);
808
809 spin_lock_bh(root_lock);
810
811 val = (qdisc_is_running(q) ||
812 test_bit(__QDISC_STATE_SCHED, &q->state));
813
814 spin_unlock_bh(root_lock);
815
816 if (val)
817 return true;
818 }
819 return false;
820}
821
822
823
824
825
826
827
828
829void dev_deactivate_many(struct list_head *head)
830{
831 struct net_device *dev;
832 bool sync_needed = false;
833
834 list_for_each_entry(dev, head, close_list) {
835 netdev_for_each_tx_queue(dev, dev_deactivate_queue,
836 &noop_qdisc);
837 if (dev_ingress_queue(dev))
838 dev_deactivate_queue(dev, dev_ingress_queue(dev),
839 &noop_qdisc);
840
841 dev_watchdog_down(dev);
842 sync_needed |= !dev->dismantle;
843 }
844
845
846
847
848
849 if (sync_needed)
850 synchronize_net();
851
852
853 list_for_each_entry(dev, head, close_list)
854 while (some_qdisc_is_busy(dev))
855 yield();
856}
857
858void dev_deactivate(struct net_device *dev)
859{
860 LIST_HEAD(single);
861
862 list_add(&dev->close_list, &single);
863 dev_deactivate_many(&single);
864 list_del(&single);
865}
866EXPORT_SYMBOL(dev_deactivate);
867
868static void dev_init_scheduler_queue(struct net_device *dev,
869 struct netdev_queue *dev_queue,
870 void *_qdisc)
871{
872 struct Qdisc *qdisc = _qdisc;
873
874 dev_queue->qdisc = qdisc;
875 dev_queue->qdisc_sleeping = qdisc;
876}
877
878void dev_init_scheduler(struct net_device *dev)
879{
880 dev->qdisc = &noop_qdisc;
881 netdev_for_each_tx_queue(dev, dev_init_scheduler_queue, &noop_qdisc);
882 if (dev_ingress_queue(dev))
883 dev_init_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc);
884
885 setup_timer(&dev->watchdog_timer, dev_watchdog, (unsigned long)dev);
886}
887
888static void shutdown_scheduler_queue(struct net_device *dev,
889 struct netdev_queue *dev_queue,
890 void *_qdisc_default)
891{
892 struct Qdisc *qdisc = dev_queue->qdisc_sleeping;
893 struct Qdisc *qdisc_default = _qdisc_default;
894
895 if (qdisc) {
896 rcu_assign_pointer(dev_queue->qdisc, qdisc_default);
897 dev_queue->qdisc_sleeping = qdisc_default;
898
899 qdisc_destroy(qdisc);
900 }
901}
902
903void dev_shutdown(struct net_device *dev)
904{
905 netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc);
906 if (dev_ingress_queue(dev))
907 shutdown_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc);
908 qdisc_destroy(dev->qdisc);
909 dev->qdisc = &noop_qdisc;
910
911 WARN_ON(timer_pending(&dev->watchdog_timer));
912}
913
914void psched_ratecfg_precompute(struct psched_ratecfg *r,
915 const struct tc_ratespec *conf,
916 u64 rate64)
917{
918 memset(r, 0, sizeof(*r));
919 r->overhead = conf->overhead;
920 r->rate_bytes_ps = max_t(u64, conf->rate, rate64);
921 r->linklayer = (conf->linklayer & TC_LINKLAYER_MASK);
922 r->mult = 1;
923
924
925
926
927
928
929
930
931
932
933
934
935
936 if (r->rate_bytes_ps > 0) {
937 u64 factor = NSEC_PER_SEC;
938
939 for (;;) {
940 r->mult = div64_u64(factor, r->rate_bytes_ps);
941 if (r->mult & (1U << 31) || factor & (1ULL << 63))
942 break;
943 factor <<= 1;
944 r->shift++;
945 }
946 }
947}
948EXPORT_SYMBOL(psched_ratecfg_precompute);
949