2 * net/sched/sch_generic.c Generic packet scheduler routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 * Jamal Hadi Salim, <hadi@cyberus.ca> 990601
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 <net/pkt_sched.h>
30 /* Main transmission queue. */
32 /* Modifications to data participating in scheduling must be protected with
33 * qdisc_lock(qdisc) spinlock.
35 * The idea is the following:
36 * - enqueue, dequeue are serialized via qdisc root lock
37 * - ingress filtering is also serialized via qdisc root lock
38 * - updates to tree and tree walking are only done under the rtnl mutex.
41 static inline int dev_requeue_skb(struct sk_buff
*skb
, struct Qdisc
*q
)
45 q
->q
.qlen
++; /* it's still part of the queue */
51 static inline struct sk_buff
*dequeue_skb(struct Qdisc
*q
)
53 struct sk_buff
*skb
= q
->gso_skb
;
56 struct net_device
*dev
= qdisc_dev(q
);
57 struct netdev_queue
*txq
;
59 /* check the reason of requeuing without tx lock first */
60 txq
= netdev_get_tx_queue(dev
, skb_get_queue_mapping(skb
));
61 if (!netif_tx_queue_stopped(txq
) &&
62 !netif_tx_queue_frozen(txq
)) {
74 static inline int handle_dev_cpu_collision(struct sk_buff
*skb
,
75 struct netdev_queue
*dev_queue
,
80 if (unlikely(dev_queue
->xmit_lock_owner
== smp_processor_id())) {
82 * Same CPU holding the lock. It may be a transient
83 * configuration error, when hard_start_xmit() recurses. We
84 * detect it by checking xmit owner and drop the packet when
85 * deadloop is detected. Return OK to try the next skb.
89 printk(KERN_WARNING
"Dead loop on netdevice %s, "
90 "fix it urgently!\n", dev_queue
->dev
->name
);
94 * Another cpu is holding lock, requeue & delay xmits for
97 __get_cpu_var(netdev_rx_stat
).cpu_collision
++;
98 ret
= dev_requeue_skb(skb
, q
);
105 * Transmit one skb, and handle the return status as required. Holding the
106 * __QDISC_STATE_RUNNING bit guarantees that only one CPU can execute this
109 * Returns to the caller:
110 * 0 - queue is empty or throttled.
111 * >0 - queue is not empty.
113 int sch_direct_xmit(struct sk_buff
*skb
, struct Qdisc
*q
,
114 struct net_device
*dev
, struct netdev_queue
*txq
,
115 spinlock_t
*root_lock
)
117 int ret
= NETDEV_TX_BUSY
;
119 /* And release qdisc */
120 spin_unlock(root_lock
);
122 HARD_TX_LOCK(dev
, txq
, smp_processor_id());
123 if (!netif_tx_queue_stopped(txq
) && !netif_tx_queue_frozen(txq
))
124 ret
= dev_hard_start_xmit(skb
, dev
, txq
);
126 HARD_TX_UNLOCK(dev
, txq
);
128 spin_lock(root_lock
);
130 if (dev_xmit_complete(ret
)) {
131 /* Driver sent out skb successfully or skb was consumed */
133 } else if (ret
== NETDEV_TX_LOCKED
) {
134 /* Driver try lock failed */
135 ret
= handle_dev_cpu_collision(skb
, txq
, q
);
137 /* Driver returned NETDEV_TX_BUSY - requeue skb */
138 if (unlikely (ret
!= NETDEV_TX_BUSY
&& net_ratelimit()))
139 printk(KERN_WARNING
"BUG %s code %d qlen %d\n",
140 dev
->name
, ret
, q
->q
.qlen
);
142 ret
= dev_requeue_skb(skb
, q
);
145 if (ret
&& (netif_tx_queue_stopped(txq
) ||
146 netif_tx_queue_frozen(txq
)))
153 * NOTE: Called under qdisc_lock(q) with locally disabled BH.
155 * __QDISC_STATE_RUNNING guarantees only one CPU can process
156 * this qdisc at a time. qdisc_lock(q) serializes queue accesses for
159 * netif_tx_lock serializes accesses to device driver.
161 * qdisc_lock(q) and netif_tx_lock are mutually exclusive,
162 * if one is grabbed, another must be free.
164 * Note, that this procedure can be called by a watchdog timer
166 * Returns to the caller:
167 * 0 - queue is empty or throttled.
168 * >0 - queue is not empty.
171 static inline int qdisc_restart(struct Qdisc
*q
)
173 struct netdev_queue
*txq
;
174 struct net_device
*dev
;
175 spinlock_t
*root_lock
;
179 skb
= dequeue_skb(q
);
183 root_lock
= qdisc_lock(q
);
185 txq
= netdev_get_tx_queue(dev
, skb_get_queue_mapping(skb
));
187 return sch_direct_xmit(skb
, q
, dev
, txq
, root_lock
);
190 void __qdisc_run(struct Qdisc
*q
)
192 unsigned long start_time
= jiffies
;
194 while (qdisc_restart(q
)) {
196 * Postpone processing if
197 * 1. another process needs the CPU;
198 * 2. we've been doing it for too long.
200 if (need_resched() || jiffies
!= start_time
) {
206 clear_bit(__QDISC_STATE_RUNNING
, &q
->state
);
209 unsigned long dev_trans_start(struct net_device
*dev
)
211 unsigned long val
, res
= dev
->trans_start
;
214 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
215 val
= netdev_get_tx_queue(dev
, i
)->trans_start
;
216 if (val
&& time_after(val
, res
))
219 dev
->trans_start
= res
;
222 EXPORT_SYMBOL(dev_trans_start
);
224 static void dev_watchdog(unsigned long arg
)
226 struct net_device
*dev
= (struct net_device
*)arg
;
229 if (!qdisc_tx_is_noop(dev
)) {
230 if (netif_device_present(dev
) &&
231 netif_running(dev
) &&
232 netif_carrier_ok(dev
)) {
233 int some_queue_timedout
= 0;
235 unsigned long trans_start
;
237 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
238 struct netdev_queue
*txq
;
240 txq
= netdev_get_tx_queue(dev
, i
);
242 * old device drivers set dev->trans_start
244 trans_start
= txq
->trans_start
? : dev
->trans_start
;
245 if (netif_tx_queue_stopped(txq
) &&
246 time_after(jiffies
, (trans_start
+
247 dev
->watchdog_timeo
))) {
248 some_queue_timedout
= 1;
253 if (some_queue_timedout
) {
255 WARN_ONCE(1, KERN_INFO
"NETDEV WATCHDOG: %s (%s): transmit queue %u timed out\n",
256 dev
->name
, netdev_drivername(dev
, drivername
, 64), i
);
257 dev
->netdev_ops
->ndo_tx_timeout(dev
);
259 if (!mod_timer(&dev
->watchdog_timer
,
260 round_jiffies(jiffies
+
261 dev
->watchdog_timeo
)))
265 netif_tx_unlock(dev
);
270 void __netdev_watchdog_up(struct net_device
*dev
)
272 if (dev
->netdev_ops
->ndo_tx_timeout
) {
273 if (dev
->watchdog_timeo
<= 0)
274 dev
->watchdog_timeo
= 5*HZ
;
275 if (!mod_timer(&dev
->watchdog_timer
,
276 round_jiffies(jiffies
+ dev
->watchdog_timeo
)))
281 static void dev_watchdog_up(struct net_device
*dev
)
283 __netdev_watchdog_up(dev
);
286 static void dev_watchdog_down(struct net_device
*dev
)
288 netif_tx_lock_bh(dev
);
289 if (del_timer(&dev
->watchdog_timer
))
291 netif_tx_unlock_bh(dev
);
295 * netif_carrier_on - set carrier
296 * @dev: network device
298 * Device has detected that carrier.
300 void netif_carrier_on(struct net_device
*dev
)
302 if (test_and_clear_bit(__LINK_STATE_NOCARRIER
, &dev
->state
)) {
303 if (dev
->reg_state
== NETREG_UNINITIALIZED
)
305 linkwatch_fire_event(dev
);
306 if (netif_running(dev
))
307 __netdev_watchdog_up(dev
);
310 EXPORT_SYMBOL(netif_carrier_on
);
313 * netif_carrier_off - clear carrier
314 * @dev: network device
316 * Device has detected loss of carrier.
318 void netif_carrier_off(struct net_device
*dev
)
320 if (!test_and_set_bit(__LINK_STATE_NOCARRIER
, &dev
->state
)) {
321 if (dev
->reg_state
== NETREG_UNINITIALIZED
)
323 linkwatch_fire_event(dev
);
326 EXPORT_SYMBOL(netif_carrier_off
);
328 /* "NOOP" scheduler: the best scheduler, recommended for all interfaces
329 under all circumstances. It is difficult to invent anything faster or
333 static int noop_enqueue(struct sk_buff
*skb
, struct Qdisc
* qdisc
)
339 static struct sk_buff
*noop_dequeue(struct Qdisc
* qdisc
)
344 struct Qdisc_ops noop_qdisc_ops __read_mostly
= {
347 .enqueue
= noop_enqueue
,
348 .dequeue
= noop_dequeue
,
349 .peek
= noop_dequeue
,
350 .owner
= THIS_MODULE
,
353 static struct netdev_queue noop_netdev_queue
= {
354 .qdisc
= &noop_qdisc
,
355 .qdisc_sleeping
= &noop_qdisc
,
358 struct Qdisc noop_qdisc
= {
359 .enqueue
= noop_enqueue
,
360 .dequeue
= noop_dequeue
,
361 .flags
= TCQ_F_BUILTIN
,
362 .ops
= &noop_qdisc_ops
,
363 .list
= LIST_HEAD_INIT(noop_qdisc
.list
),
364 .q
.lock
= __SPIN_LOCK_UNLOCKED(noop_qdisc
.q
.lock
),
365 .dev_queue
= &noop_netdev_queue
,
367 EXPORT_SYMBOL(noop_qdisc
);
369 static struct Qdisc_ops noqueue_qdisc_ops __read_mostly
= {
372 .enqueue
= noop_enqueue
,
373 .dequeue
= noop_dequeue
,
374 .peek
= noop_dequeue
,
375 .owner
= THIS_MODULE
,
378 static struct Qdisc noqueue_qdisc
;
379 static struct netdev_queue noqueue_netdev_queue
= {
380 .qdisc
= &noqueue_qdisc
,
381 .qdisc_sleeping
= &noqueue_qdisc
,
384 static struct Qdisc noqueue_qdisc
= {
386 .dequeue
= noop_dequeue
,
387 .flags
= TCQ_F_BUILTIN
,
388 .ops
= &noqueue_qdisc_ops
,
389 .list
= LIST_HEAD_INIT(noqueue_qdisc
.list
),
390 .q
.lock
= __SPIN_LOCK_UNLOCKED(noqueue_qdisc
.q
.lock
),
391 .dev_queue
= &noqueue_netdev_queue
,
395 static const u8 prio2band
[TC_PRIO_MAX
+1] =
396 { 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 };
398 /* 3-band FIFO queue: old style, but should be a bit faster than
399 generic prio+fifo combination.
402 #define PFIFO_FAST_BANDS 3
405 * Private data for a pfifo_fast scheduler containing:
406 * - queues for the three band
407 * - bitmap indicating which of the bands contain skbs
409 struct pfifo_fast_priv
{
411 struct sk_buff_head q
[PFIFO_FAST_BANDS
];
415 * Convert a bitmap to the first band number where an skb is queued, where:
416 * bitmap=0 means there are no skbs on any band.
417 * bitmap=1 means there is an skb on band 0.
418 * bitmap=7 means there are skbs on all 3 bands, etc.
420 static const int bitmap2band
[] = {-1, 0, 1, 0, 2, 0, 1, 0};
422 static inline struct sk_buff_head
*band2list(struct pfifo_fast_priv
*priv
,
425 return priv
->q
+ band
;
428 static int pfifo_fast_enqueue(struct sk_buff
*skb
, struct Qdisc
* qdisc
)
430 if (skb_queue_len(&qdisc
->q
) < qdisc_dev(qdisc
)->tx_queue_len
) {
431 int band
= prio2band
[skb
->priority
& TC_PRIO_MAX
];
432 struct pfifo_fast_priv
*priv
= qdisc_priv(qdisc
);
433 struct sk_buff_head
*list
= band2list(priv
, band
);
435 priv
->bitmap
|= (1 << band
);
437 return __qdisc_enqueue_tail(skb
, qdisc
, list
);
440 return qdisc_drop(skb
, qdisc
);
443 static struct sk_buff
*pfifo_fast_dequeue(struct Qdisc
* qdisc
)
445 struct pfifo_fast_priv
*priv
= qdisc_priv(qdisc
);
446 int band
= bitmap2band
[priv
->bitmap
];
448 if (likely(band
>= 0)) {
449 struct sk_buff_head
*list
= band2list(priv
, band
);
450 struct sk_buff
*skb
= __qdisc_dequeue_head(qdisc
, list
);
453 if (skb_queue_empty(list
))
454 priv
->bitmap
&= ~(1 << band
);
462 static struct sk_buff
*pfifo_fast_peek(struct Qdisc
* qdisc
)
464 struct pfifo_fast_priv
*priv
= qdisc_priv(qdisc
);
465 int band
= bitmap2band
[priv
->bitmap
];
468 struct sk_buff_head
*list
= band2list(priv
, band
);
470 return skb_peek(list
);
476 static void pfifo_fast_reset(struct Qdisc
* qdisc
)
479 struct pfifo_fast_priv
*priv
= qdisc_priv(qdisc
);
481 for (prio
= 0; prio
< PFIFO_FAST_BANDS
; prio
++)
482 __qdisc_reset_queue(qdisc
, band2list(priv
, prio
));
485 qdisc
->qstats
.backlog
= 0;
489 static int pfifo_fast_dump(struct Qdisc
*qdisc
, struct sk_buff
*skb
)
491 struct tc_prio_qopt opt
= { .bands
= PFIFO_FAST_BANDS
};
493 memcpy(&opt
.priomap
, prio2band
, TC_PRIO_MAX
+1);
494 NLA_PUT(skb
, TCA_OPTIONS
, sizeof(opt
), &opt
);
501 static int pfifo_fast_init(struct Qdisc
*qdisc
, struct nlattr
*opt
)
504 struct pfifo_fast_priv
*priv
= qdisc_priv(qdisc
);
506 for (prio
= 0; prio
< PFIFO_FAST_BANDS
; prio
++)
507 skb_queue_head_init(band2list(priv
, prio
));
512 struct Qdisc_ops pfifo_fast_ops __read_mostly
= {
514 .priv_size
= sizeof(struct pfifo_fast_priv
),
515 .enqueue
= pfifo_fast_enqueue
,
516 .dequeue
= pfifo_fast_dequeue
,
517 .peek
= pfifo_fast_peek
,
518 .init
= pfifo_fast_init
,
519 .reset
= pfifo_fast_reset
,
520 .dump
= pfifo_fast_dump
,
521 .owner
= THIS_MODULE
,
524 struct Qdisc
*qdisc_alloc(struct netdev_queue
*dev_queue
,
525 struct Qdisc_ops
*ops
)
532 /* ensure that the Qdisc and the private data are 32-byte aligned */
533 size
= QDISC_ALIGN(sizeof(*sch
));
534 size
+= ops
->priv_size
+ (QDISC_ALIGNTO
- 1);
536 p
= kzalloc(size
, GFP_KERNEL
);
539 sch
= (struct Qdisc
*) QDISC_ALIGN((unsigned long) p
);
540 sch
->padded
= (char *) sch
- (char *) p
;
542 INIT_LIST_HEAD(&sch
->list
);
543 skb_queue_head_init(&sch
->q
);
545 sch
->enqueue
= ops
->enqueue
;
546 sch
->dequeue
= ops
->dequeue
;
547 sch
->dev_queue
= dev_queue
;
548 dev_hold(qdisc_dev(sch
));
549 atomic_set(&sch
->refcnt
, 1);
556 struct Qdisc
* qdisc_create_dflt(struct net_device
*dev
,
557 struct netdev_queue
*dev_queue
,
558 struct Qdisc_ops
*ops
,
559 unsigned int parentid
)
563 sch
= qdisc_alloc(dev_queue
, ops
);
566 sch
->parent
= parentid
;
568 if (!ops
->init
|| ops
->init(sch
, NULL
) == 0)
575 EXPORT_SYMBOL(qdisc_create_dflt
);
577 /* Under qdisc_lock(qdisc) and BH! */
579 void qdisc_reset(struct Qdisc
*qdisc
)
581 const struct Qdisc_ops
*ops
= qdisc
->ops
;
586 if (qdisc
->gso_skb
) {
587 kfree_skb(qdisc
->gso_skb
);
588 qdisc
->gso_skb
= NULL
;
592 EXPORT_SYMBOL(qdisc_reset
);
594 void qdisc_destroy(struct Qdisc
*qdisc
)
596 const struct Qdisc_ops
*ops
= qdisc
->ops
;
598 if (qdisc
->flags
& TCQ_F_BUILTIN
||
599 !atomic_dec_and_test(&qdisc
->refcnt
))
602 #ifdef CONFIG_NET_SCHED
603 qdisc_list_del(qdisc
);
605 qdisc_put_stab(qdisc
->stab
);
607 gen_kill_estimator(&qdisc
->bstats
, &qdisc
->rate_est
);
613 module_put(ops
->owner
);
614 dev_put(qdisc_dev(qdisc
));
616 kfree_skb(qdisc
->gso_skb
);
617 kfree((char *) qdisc
- qdisc
->padded
);
619 EXPORT_SYMBOL(qdisc_destroy
);
621 /* Attach toplevel qdisc to device queue. */
622 struct Qdisc
*dev_graft_qdisc(struct netdev_queue
*dev_queue
,
625 struct Qdisc
*oqdisc
= dev_queue
->qdisc_sleeping
;
626 spinlock_t
*root_lock
;
628 root_lock
= qdisc_lock(oqdisc
);
629 spin_lock_bh(root_lock
);
631 /* Prune old scheduler */
632 if (oqdisc
&& atomic_read(&oqdisc
->refcnt
) <= 1)
635 /* ... and graft new one */
638 dev_queue
->qdisc_sleeping
= qdisc
;
639 rcu_assign_pointer(dev_queue
->qdisc
, &noop_qdisc
);
641 spin_unlock_bh(root_lock
);
646 static void attach_one_default_qdisc(struct net_device
*dev
,
647 struct netdev_queue
*dev_queue
,
652 if (dev
->tx_queue_len
) {
653 qdisc
= qdisc_create_dflt(dev
, dev_queue
,
654 &pfifo_fast_ops
, TC_H_ROOT
);
656 printk(KERN_INFO
"%s: activation failed\n", dev
->name
);
660 /* Can by-pass the queue discipline for default qdisc */
661 qdisc
->flags
|= TCQ_F_CAN_BYPASS
;
663 qdisc
= &noqueue_qdisc
;
665 dev_queue
->qdisc_sleeping
= qdisc
;
668 static void attach_default_qdiscs(struct net_device
*dev
)
670 struct netdev_queue
*txq
;
673 txq
= netdev_get_tx_queue(dev
, 0);
675 if (!netif_is_multiqueue(dev
) || dev
->tx_queue_len
== 0) {
676 netdev_for_each_tx_queue(dev
, attach_one_default_qdisc
, NULL
);
677 dev
->qdisc
= txq
->qdisc_sleeping
;
678 atomic_inc(&dev
->qdisc
->refcnt
);
680 qdisc
= qdisc_create_dflt(dev
, txq
, &mq_qdisc_ops
, TC_H_ROOT
);
682 qdisc
->ops
->attach(qdisc
);
688 static void transition_one_qdisc(struct net_device
*dev
,
689 struct netdev_queue
*dev_queue
,
690 void *_need_watchdog
)
692 struct Qdisc
*new_qdisc
= dev_queue
->qdisc_sleeping
;
693 int *need_watchdog_p
= _need_watchdog
;
695 if (!(new_qdisc
->flags
& TCQ_F_BUILTIN
))
696 clear_bit(__QDISC_STATE_DEACTIVATED
, &new_qdisc
->state
);
698 rcu_assign_pointer(dev_queue
->qdisc
, new_qdisc
);
699 if (need_watchdog_p
&& new_qdisc
!= &noqueue_qdisc
) {
700 dev_queue
->trans_start
= 0;
701 *need_watchdog_p
= 1;
705 void dev_activate(struct net_device
*dev
)
709 /* No queueing discipline is attached to device;
710 create default one i.e. pfifo_fast for devices,
711 which need queueing and noqueue_qdisc for
715 if (dev
->qdisc
== &noop_qdisc
)
716 attach_default_qdiscs(dev
);
718 if (!netif_carrier_ok(dev
))
719 /* Delay activation until next carrier-on event */
723 netdev_for_each_tx_queue(dev
, transition_one_qdisc
, &need_watchdog
);
724 transition_one_qdisc(dev
, &dev
->rx_queue
, NULL
);
727 dev
->trans_start
= jiffies
;
728 dev_watchdog_up(dev
);
732 static void dev_deactivate_queue(struct net_device
*dev
,
733 struct netdev_queue
*dev_queue
,
734 void *_qdisc_default
)
736 struct Qdisc
*qdisc_default
= _qdisc_default
;
739 qdisc
= dev_queue
->qdisc
;
741 spin_lock_bh(qdisc_lock(qdisc
));
743 if (!(qdisc
->flags
& TCQ_F_BUILTIN
))
744 set_bit(__QDISC_STATE_DEACTIVATED
, &qdisc
->state
);
746 rcu_assign_pointer(dev_queue
->qdisc
, qdisc_default
);
749 spin_unlock_bh(qdisc_lock(qdisc
));
753 static bool some_qdisc_is_busy(struct net_device
*dev
)
757 for (i
= 0; i
< dev
->num_tx_queues
; i
++) {
758 struct netdev_queue
*dev_queue
;
759 spinlock_t
*root_lock
;
763 dev_queue
= netdev_get_tx_queue(dev
, i
);
764 q
= dev_queue
->qdisc_sleeping
;
765 root_lock
= qdisc_lock(q
);
767 spin_lock_bh(root_lock
);
769 val
= (test_bit(__QDISC_STATE_RUNNING
, &q
->state
) ||
770 test_bit(__QDISC_STATE_SCHED
, &q
->state
));
772 spin_unlock_bh(root_lock
);
780 void dev_deactivate(struct net_device
*dev
)
782 netdev_for_each_tx_queue(dev
, dev_deactivate_queue
, &noop_qdisc
);
783 dev_deactivate_queue(dev
, &dev
->rx_queue
, &noop_qdisc
);
785 dev_watchdog_down(dev
);
787 /* Wait for outstanding qdisc-less dev_queue_xmit calls. */
790 /* Wait for outstanding qdisc_run calls. */
791 while (some_qdisc_is_busy(dev
))
795 static void dev_init_scheduler_queue(struct net_device
*dev
,
796 struct netdev_queue
*dev_queue
,
799 struct Qdisc
*qdisc
= _qdisc
;
801 dev_queue
->qdisc
= qdisc
;
802 dev_queue
->qdisc_sleeping
= qdisc
;
805 void dev_init_scheduler(struct net_device
*dev
)
807 dev
->qdisc
= &noop_qdisc
;
808 netdev_for_each_tx_queue(dev
, dev_init_scheduler_queue
, &noop_qdisc
);
809 dev_init_scheduler_queue(dev
, &dev
->rx_queue
, &noop_qdisc
);
811 setup_timer(&dev
->watchdog_timer
, dev_watchdog
, (unsigned long)dev
);
814 static void shutdown_scheduler_queue(struct net_device
*dev
,
815 struct netdev_queue
*dev_queue
,
816 void *_qdisc_default
)
818 struct Qdisc
*qdisc
= dev_queue
->qdisc_sleeping
;
819 struct Qdisc
*qdisc_default
= _qdisc_default
;
822 rcu_assign_pointer(dev_queue
->qdisc
, qdisc_default
);
823 dev_queue
->qdisc_sleeping
= qdisc_default
;
825 qdisc_destroy(qdisc
);
829 void dev_shutdown(struct net_device
*dev
)
831 netdev_for_each_tx_queue(dev
, shutdown_scheduler_queue
, &noop_qdisc
);
832 shutdown_scheduler_queue(dev
, &dev
->rx_queue
, &noop_qdisc
);
833 qdisc_destroy(dev
->qdisc
);
834 dev
->qdisc
= &noop_qdisc
;
836 WARN_ON(timer_pending(&dev
->watchdog_timer
));