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Merge branch 'am335x-phy-fixes' into omap-for-v5.0/fixes-v2
[mirror_ubuntu-eoan-kernel.git] / net / sched / sch_generic.c
1 /*
2 * net/sched/sch_generic.c Generic packet scheduler routines.
3 *
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.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 * Jamal Hadi Salim, <hadi@cyberus.ca> 990601
11 * - Ingress support
12 */
13
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 <linux/skb_array.h>
30 #include <linux/if_macvlan.h>
31 #include <net/sch_generic.h>
32 #include <net/pkt_sched.h>
33 #include <net/dst.h>
34 #include <trace/events/qdisc.h>
35 #include <net/xfrm.h>
36
37 /* Qdisc to use by default */
38 const struct Qdisc_ops *default_qdisc_ops = &pfifo_fast_ops;
39 EXPORT_SYMBOL(default_qdisc_ops);
40
41 /* Main transmission queue. */
42
43 /* Modifications to data participating in scheduling must be protected with
44 * qdisc_lock(qdisc) spinlock.
45 *
46 * The idea is the following:
47 * - enqueue, dequeue are serialized via qdisc root lock
48 * - ingress filtering is also serialized via qdisc root lock
49 * - updates to tree and tree walking are only done under the rtnl mutex.
50 */
51
52 static inline struct sk_buff *__skb_dequeue_bad_txq(struct Qdisc *q)
53 {
54 const struct netdev_queue *txq = q->dev_queue;
55 spinlock_t *lock = NULL;
56 struct sk_buff *skb;
57
58 if (q->flags & TCQ_F_NOLOCK) {
59 lock = qdisc_lock(q);
60 spin_lock(lock);
61 }
62
63 skb = skb_peek(&q->skb_bad_txq);
64 if (skb) {
65 /* check the reason of requeuing without tx lock first */
66 txq = skb_get_tx_queue(txq->dev, skb);
67 if (!netif_xmit_frozen_or_stopped(txq)) {
68 skb = __skb_dequeue(&q->skb_bad_txq);
69 if (qdisc_is_percpu_stats(q)) {
70 qdisc_qstats_cpu_backlog_dec(q, skb);
71 qdisc_qstats_cpu_qlen_dec(q);
72 } else {
73 qdisc_qstats_backlog_dec(q, skb);
74 q->q.qlen--;
75 }
76 } else {
77 skb = NULL;
78 }
79 }
80
81 if (lock)
82 spin_unlock(lock);
83
84 return skb;
85 }
86
87 static inline struct sk_buff *qdisc_dequeue_skb_bad_txq(struct Qdisc *q)
88 {
89 struct sk_buff *skb = skb_peek(&q->skb_bad_txq);
90
91 if (unlikely(skb))
92 skb = __skb_dequeue_bad_txq(q);
93
94 return skb;
95 }
96
97 static inline void qdisc_enqueue_skb_bad_txq(struct Qdisc *q,
98 struct sk_buff *skb)
99 {
100 spinlock_t *lock = NULL;
101
102 if (q->flags & TCQ_F_NOLOCK) {
103 lock = qdisc_lock(q);
104 spin_lock(lock);
105 }
106
107 __skb_queue_tail(&q->skb_bad_txq, skb);
108
109 if (qdisc_is_percpu_stats(q)) {
110 qdisc_qstats_cpu_backlog_inc(q, skb);
111 qdisc_qstats_cpu_qlen_inc(q);
112 } else {
113 qdisc_qstats_backlog_inc(q, skb);
114 q->q.qlen++;
115 }
116
117 if (lock)
118 spin_unlock(lock);
119 }
120
121 static inline int __dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q)
122 {
123 while (skb) {
124 struct sk_buff *next = skb->next;
125
126 __skb_queue_tail(&q->gso_skb, skb);
127 q->qstats.requeues++;
128 qdisc_qstats_backlog_inc(q, skb);
129 q->q.qlen++; /* it's still part of the queue */
130
131 skb = next;
132 }
133 __netif_schedule(q);
134
135 return 0;
136 }
137
138 static inline int dev_requeue_skb_locked(struct sk_buff *skb, struct Qdisc *q)
139 {
140 spinlock_t *lock = qdisc_lock(q);
141
142 spin_lock(lock);
143 while (skb) {
144 struct sk_buff *next = skb->next;
145
146 __skb_queue_tail(&q->gso_skb, skb);
147
148 qdisc_qstats_cpu_requeues_inc(q);
149 qdisc_qstats_cpu_backlog_inc(q, skb);
150 qdisc_qstats_cpu_qlen_inc(q);
151
152 skb = next;
153 }
154 spin_unlock(lock);
155
156 __netif_schedule(q);
157
158 return 0;
159 }
160
161 static inline int dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q)
162 {
163 if (q->flags & TCQ_F_NOLOCK)
164 return dev_requeue_skb_locked(skb, q);
165 else
166 return __dev_requeue_skb(skb, q);
167 }
168
169 static void try_bulk_dequeue_skb(struct Qdisc *q,
170 struct sk_buff *skb,
171 const struct netdev_queue *txq,
172 int *packets)
173 {
174 int bytelimit = qdisc_avail_bulklimit(txq) - skb->len;
175
176 while (bytelimit > 0) {
177 struct sk_buff *nskb = q->dequeue(q);
178
179 if (!nskb)
180 break;
181
182 bytelimit -= nskb->len; /* covers GSO len */
183 skb->next = nskb;
184 skb = nskb;
185 (*packets)++; /* GSO counts as one pkt */
186 }
187 skb_mark_not_on_list(skb);
188 }
189
190 /* This variant of try_bulk_dequeue_skb() makes sure
191 * all skbs in the chain are for the same txq
192 */
193 static void try_bulk_dequeue_skb_slow(struct Qdisc *q,
194 struct sk_buff *skb,
195 int *packets)
196 {
197 int mapping = skb_get_queue_mapping(skb);
198 struct sk_buff *nskb;
199 int cnt = 0;
200
201 do {
202 nskb = q->dequeue(q);
203 if (!nskb)
204 break;
205 if (unlikely(skb_get_queue_mapping(nskb) != mapping)) {
206 qdisc_enqueue_skb_bad_txq(q, nskb);
207 break;
208 }
209 skb->next = nskb;
210 skb = nskb;
211 } while (++cnt < 8);
212 (*packets) += cnt;
213 skb_mark_not_on_list(skb);
214 }
215
216 /* Note that dequeue_skb can possibly return a SKB list (via skb->next).
217 * A requeued skb (via q->gso_skb) can also be a SKB list.
218 */
219 static struct sk_buff *dequeue_skb(struct Qdisc *q, bool *validate,
220 int *packets)
221 {
222 const struct netdev_queue *txq = q->dev_queue;
223 struct sk_buff *skb = NULL;
224
225 *packets = 1;
226 if (unlikely(!skb_queue_empty(&q->gso_skb))) {
227 spinlock_t *lock = NULL;
228
229 if (q->flags & TCQ_F_NOLOCK) {
230 lock = qdisc_lock(q);
231 spin_lock(lock);
232 }
233
234 skb = skb_peek(&q->gso_skb);
235
236 /* skb may be null if another cpu pulls gso_skb off in between
237 * empty check and lock.
238 */
239 if (!skb) {
240 if (lock)
241 spin_unlock(lock);
242 goto validate;
243 }
244
245 /* skb in gso_skb were already validated */
246 *validate = false;
247 if (xfrm_offload(skb))
248 *validate = true;
249 /* check the reason of requeuing without tx lock first */
250 txq = skb_get_tx_queue(txq->dev, skb);
251 if (!netif_xmit_frozen_or_stopped(txq)) {
252 skb = __skb_dequeue(&q->gso_skb);
253 if (qdisc_is_percpu_stats(q)) {
254 qdisc_qstats_cpu_backlog_dec(q, skb);
255 qdisc_qstats_cpu_qlen_dec(q);
256 } else {
257 qdisc_qstats_backlog_dec(q, skb);
258 q->q.qlen--;
259 }
260 } else {
261 skb = NULL;
262 }
263 if (lock)
264 spin_unlock(lock);
265 goto trace;
266 }
267 validate:
268 *validate = true;
269
270 if ((q->flags & TCQ_F_ONETXQUEUE) &&
271 netif_xmit_frozen_or_stopped(txq))
272 return skb;
273
274 skb = qdisc_dequeue_skb_bad_txq(q);
275 if (unlikely(skb))
276 goto bulk;
277 skb = q->dequeue(q);
278 if (skb) {
279 bulk:
280 if (qdisc_may_bulk(q))
281 try_bulk_dequeue_skb(q, skb, txq, packets);
282 else
283 try_bulk_dequeue_skb_slow(q, skb, packets);
284 }
285 trace:
286 trace_qdisc_dequeue(q, txq, *packets, skb);
287 return skb;
288 }
289
290 /*
291 * Transmit possibly several skbs, and handle the return status as
292 * required. Owning running seqcount bit guarantees that
293 * only one CPU can execute this function.
294 *
295 * Returns to the caller:
296 * false - hardware queue frozen backoff
297 * true - feel free to send more pkts
298 */
299 bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
300 struct net_device *dev, struct netdev_queue *txq,
301 spinlock_t *root_lock, bool validate)
302 {
303 int ret = NETDEV_TX_BUSY;
304 bool again = false;
305
306 /* And release qdisc */
307 if (root_lock)
308 spin_unlock(root_lock);
309
310 /* Note that we validate skb (GSO, checksum, ...) outside of locks */
311 if (validate)
312 skb = validate_xmit_skb_list(skb, dev, &again);
313
314 #ifdef CONFIG_XFRM_OFFLOAD
315 if (unlikely(again)) {
316 if (root_lock)
317 spin_lock(root_lock);
318
319 dev_requeue_skb(skb, q);
320 return false;
321 }
322 #endif
323
324 if (likely(skb)) {
325 HARD_TX_LOCK(dev, txq, smp_processor_id());
326 if (!netif_xmit_frozen_or_stopped(txq))
327 skb = dev_hard_start_xmit(skb, dev, txq, &ret);
328
329 HARD_TX_UNLOCK(dev, txq);
330 } else {
331 if (root_lock)
332 spin_lock(root_lock);
333 return true;
334 }
335
336 if (root_lock)
337 spin_lock(root_lock);
338
339 if (!dev_xmit_complete(ret)) {
340 /* Driver returned NETDEV_TX_BUSY - requeue skb */
341 if (unlikely(ret != NETDEV_TX_BUSY))
342 net_warn_ratelimited("BUG %s code %d qlen %d\n",
343 dev->name, ret, q->q.qlen);
344
345 dev_requeue_skb(skb, q);
346 return false;
347 }
348
349 return true;
350 }
351
352 /*
353 * NOTE: Called under qdisc_lock(q) with locally disabled BH.
354 *
355 * running seqcount guarantees only one CPU can process
356 * this qdisc at a time. qdisc_lock(q) serializes queue accesses for
357 * this queue.
358 *
359 * netif_tx_lock serializes accesses to device driver.
360 *
361 * qdisc_lock(q) and netif_tx_lock are mutually exclusive,
362 * if one is grabbed, another must be free.
363 *
364 * Note, that this procedure can be called by a watchdog timer
365 *
366 * Returns to the caller:
367 * 0 - queue is empty or throttled.
368 * >0 - queue is not empty.
369 *
370 */
371 static inline bool qdisc_restart(struct Qdisc *q, int *packets)
372 {
373 spinlock_t *root_lock = NULL;
374 struct netdev_queue *txq;
375 struct net_device *dev;
376 struct sk_buff *skb;
377 bool validate;
378
379 /* Dequeue packet */
380 skb = dequeue_skb(q, &validate, packets);
381 if (unlikely(!skb))
382 return false;
383
384 if (!(q->flags & TCQ_F_NOLOCK))
385 root_lock = qdisc_lock(q);
386
387 dev = qdisc_dev(q);
388 txq = skb_get_tx_queue(dev, skb);
389
390 return sch_direct_xmit(skb, q, dev, txq, root_lock, validate);
391 }
392
393 void __qdisc_run(struct Qdisc *q)
394 {
395 int quota = dev_tx_weight;
396 int packets;
397
398 while (qdisc_restart(q, &packets)) {
399 /*
400 * Ordered by possible occurrence: Postpone processing if
401 * 1. we've exceeded packet quota
402 * 2. another process needs the CPU;
403 */
404 quota -= packets;
405 if (quota <= 0 || need_resched()) {
406 __netif_schedule(q);
407 break;
408 }
409 }
410 }
411
412 unsigned long dev_trans_start(struct net_device *dev)
413 {
414 unsigned long val, res;
415 unsigned int i;
416
417 if (is_vlan_dev(dev))
418 dev = vlan_dev_real_dev(dev);
419 else if (netif_is_macvlan(dev))
420 dev = macvlan_dev_real_dev(dev);
421 res = netdev_get_tx_queue(dev, 0)->trans_start;
422 for (i = 1; i < dev->num_tx_queues; i++) {
423 val = netdev_get_tx_queue(dev, i)->trans_start;
424 if (val && time_after(val, res))
425 res = val;
426 }
427
428 return res;
429 }
430 EXPORT_SYMBOL(dev_trans_start);
431
432 static void dev_watchdog(struct timer_list *t)
433 {
434 struct net_device *dev = from_timer(dev, t, watchdog_timer);
435
436 netif_tx_lock(dev);
437 if (!qdisc_tx_is_noop(dev)) {
438 if (netif_device_present(dev) &&
439 netif_running(dev) &&
440 netif_carrier_ok(dev)) {
441 int some_queue_timedout = 0;
442 unsigned int i;
443 unsigned long trans_start;
444
445 for (i = 0; i < dev->num_tx_queues; i++) {
446 struct netdev_queue *txq;
447
448 txq = netdev_get_tx_queue(dev, i);
449 trans_start = txq->trans_start;
450 if (netif_xmit_stopped(txq) &&
451 time_after(jiffies, (trans_start +
452 dev->watchdog_timeo))) {
453 some_queue_timedout = 1;
454 txq->trans_timeout++;
455 break;
456 }
457 }
458
459 if (some_queue_timedout) {
460 WARN_ONCE(1, KERN_INFO "NETDEV WATCHDOG: %s (%s): transmit queue %u timed out\n",
461 dev->name, netdev_drivername(dev), i);
462 dev->netdev_ops->ndo_tx_timeout(dev);
463 }
464 if (!mod_timer(&dev->watchdog_timer,
465 round_jiffies(jiffies +
466 dev->watchdog_timeo)))
467 dev_hold(dev);
468 }
469 }
470 netif_tx_unlock(dev);
471
472 dev_put(dev);
473 }
474
475 void __netdev_watchdog_up(struct net_device *dev)
476 {
477 if (dev->netdev_ops->ndo_tx_timeout) {
478 if (dev->watchdog_timeo <= 0)
479 dev->watchdog_timeo = 5*HZ;
480 if (!mod_timer(&dev->watchdog_timer,
481 round_jiffies(jiffies + dev->watchdog_timeo)))
482 dev_hold(dev);
483 }
484 }
485
486 static void dev_watchdog_up(struct net_device *dev)
487 {
488 __netdev_watchdog_up(dev);
489 }
490
491 static void dev_watchdog_down(struct net_device *dev)
492 {
493 netif_tx_lock_bh(dev);
494 if (del_timer(&dev->watchdog_timer))
495 dev_put(dev);
496 netif_tx_unlock_bh(dev);
497 }
498
499 /**
500 * netif_carrier_on - set carrier
501 * @dev: network device
502 *
503 * Device has detected that carrier.
504 */
505 void netif_carrier_on(struct net_device *dev)
506 {
507 if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) {
508 if (dev->reg_state == NETREG_UNINITIALIZED)
509 return;
510 atomic_inc(&dev->carrier_up_count);
511 linkwatch_fire_event(dev);
512 if (netif_running(dev))
513 __netdev_watchdog_up(dev);
514 }
515 }
516 EXPORT_SYMBOL(netif_carrier_on);
517
518 /**
519 * netif_carrier_off - clear carrier
520 * @dev: network device
521 *
522 * Device has detected loss of carrier.
523 */
524 void netif_carrier_off(struct net_device *dev)
525 {
526 if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) {
527 if (dev->reg_state == NETREG_UNINITIALIZED)
528 return;
529 atomic_inc(&dev->carrier_down_count);
530 linkwatch_fire_event(dev);
531 }
532 }
533 EXPORT_SYMBOL(netif_carrier_off);
534
535 /* "NOOP" scheduler: the best scheduler, recommended for all interfaces
536 under all circumstances. It is difficult to invent anything faster or
537 cheaper.
538 */
539
540 static int noop_enqueue(struct sk_buff *skb, struct Qdisc *qdisc,
541 struct sk_buff **to_free)
542 {
543 __qdisc_drop(skb, to_free);
544 return NET_XMIT_CN;
545 }
546
547 static struct sk_buff *noop_dequeue(struct Qdisc *qdisc)
548 {
549 return NULL;
550 }
551
552 struct Qdisc_ops noop_qdisc_ops __read_mostly = {
553 .id = "noop",
554 .priv_size = 0,
555 .enqueue = noop_enqueue,
556 .dequeue = noop_dequeue,
557 .peek = noop_dequeue,
558 .owner = THIS_MODULE,
559 };
560
561 static struct netdev_queue noop_netdev_queue = {
562 .qdisc = &noop_qdisc,
563 .qdisc_sleeping = &noop_qdisc,
564 };
565
566 struct Qdisc noop_qdisc = {
567 .enqueue = noop_enqueue,
568 .dequeue = noop_dequeue,
569 .flags = TCQ_F_BUILTIN,
570 .ops = &noop_qdisc_ops,
571 .q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock),
572 .dev_queue = &noop_netdev_queue,
573 .running = SEQCNT_ZERO(noop_qdisc.running),
574 .busylock = __SPIN_LOCK_UNLOCKED(noop_qdisc.busylock),
575 .gso_skb = {
576 .next = (struct sk_buff *)&noop_qdisc.gso_skb,
577 .prev = (struct sk_buff *)&noop_qdisc.gso_skb,
578 .qlen = 0,
579 .lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.gso_skb.lock),
580 },
581 .skb_bad_txq = {
582 .next = (struct sk_buff *)&noop_qdisc.skb_bad_txq,
583 .prev = (struct sk_buff *)&noop_qdisc.skb_bad_txq,
584 .qlen = 0,
585 .lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.skb_bad_txq.lock),
586 },
587 };
588 EXPORT_SYMBOL(noop_qdisc);
589
590 static int noqueue_init(struct Qdisc *qdisc, struct nlattr *opt,
591 struct netlink_ext_ack *extack)
592 {
593 /* register_qdisc() assigns a default of noop_enqueue if unset,
594 * but __dev_queue_xmit() treats noqueue only as such
595 * if this is NULL - so clear it here. */
596 qdisc->enqueue = NULL;
597 return 0;
598 }
599
600 struct Qdisc_ops noqueue_qdisc_ops __read_mostly = {
601 .id = "noqueue",
602 .priv_size = 0,
603 .init = noqueue_init,
604 .enqueue = noop_enqueue,
605 .dequeue = noop_dequeue,
606 .peek = noop_dequeue,
607 .owner = THIS_MODULE,
608 };
609
610 static const u8 prio2band[TC_PRIO_MAX + 1] = {
611 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1
612 };
613
614 /* 3-band FIFO queue: old style, but should be a bit faster than
615 generic prio+fifo combination.
616 */
617
618 #define PFIFO_FAST_BANDS 3
619
620 /*
621 * Private data for a pfifo_fast scheduler containing:
622 * - rings for priority bands
623 */
624 struct pfifo_fast_priv {
625 struct skb_array q[PFIFO_FAST_BANDS];
626 };
627
628 static inline struct skb_array *band2list(struct pfifo_fast_priv *priv,
629 int band)
630 {
631 return &priv->q[band];
632 }
633
634 static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc,
635 struct sk_buff **to_free)
636 {
637 int band = prio2band[skb->priority & TC_PRIO_MAX];
638 struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
639 struct skb_array *q = band2list(priv, band);
640 unsigned int pkt_len = qdisc_pkt_len(skb);
641 int err;
642
643 err = skb_array_produce(q, skb);
644
645 if (unlikely(err))
646 return qdisc_drop_cpu(skb, qdisc, to_free);
647
648 qdisc_qstats_cpu_qlen_inc(qdisc);
649 /* Note: skb can not be used after skb_array_produce(),
650 * so we better not use qdisc_qstats_cpu_backlog_inc()
651 */
652 this_cpu_add(qdisc->cpu_qstats->backlog, pkt_len);
653 return NET_XMIT_SUCCESS;
654 }
655
656 static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc)
657 {
658 struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
659 struct sk_buff *skb = NULL;
660 int band;
661
662 for (band = 0; band < PFIFO_FAST_BANDS && !skb; band++) {
663 struct skb_array *q = band2list(priv, band);
664
665 if (__skb_array_empty(q))
666 continue;
667
668 skb = __skb_array_consume(q);
669 }
670 if (likely(skb)) {
671 qdisc_qstats_cpu_backlog_dec(qdisc, skb);
672 qdisc_bstats_cpu_update(qdisc, skb);
673 qdisc_qstats_cpu_qlen_dec(qdisc);
674 }
675
676 return skb;
677 }
678
679 static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc)
680 {
681 struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
682 struct sk_buff *skb = NULL;
683 int band;
684
685 for (band = 0; band < PFIFO_FAST_BANDS && !skb; band++) {
686 struct skb_array *q = band2list(priv, band);
687
688 skb = __skb_array_peek(q);
689 }
690
691 return skb;
692 }
693
694 static void pfifo_fast_reset(struct Qdisc *qdisc)
695 {
696 int i, band;
697 struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
698
699 for (band = 0; band < PFIFO_FAST_BANDS; band++) {
700 struct skb_array *q = band2list(priv, band);
701 struct sk_buff *skb;
702
703 /* NULL ring is possible if destroy path is due to a failed
704 * skb_array_init() in pfifo_fast_init() case.
705 */
706 if (!q->ring.queue)
707 continue;
708
709 while ((skb = __skb_array_consume(q)) != NULL)
710 kfree_skb(skb);
711 }
712
713 for_each_possible_cpu(i) {
714 struct gnet_stats_queue *q = per_cpu_ptr(qdisc->cpu_qstats, i);
715
716 q->backlog = 0;
717 q->qlen = 0;
718 }
719 }
720
721 static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb)
722 {
723 struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS };
724
725 memcpy(&opt.priomap, prio2band, TC_PRIO_MAX + 1);
726 if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
727 goto nla_put_failure;
728 return skb->len;
729
730 nla_put_failure:
731 return -1;
732 }
733
734 static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt,
735 struct netlink_ext_ack *extack)
736 {
737 unsigned int qlen = qdisc_dev(qdisc)->tx_queue_len;
738 struct pfifo_fast_priv *priv = qdisc_priv(qdisc);
739 int prio;
740
741 /* guard against zero length rings */
742 if (!qlen)
743 return -EINVAL;
744
745 for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
746 struct skb_array *q = band2list(priv, prio);
747 int err;
748
749 err = skb_array_init(q, qlen, GFP_KERNEL);
750 if (err)
751 return -ENOMEM;
752 }
753
754 /* Can by-pass the queue discipline */
755 qdisc->flags |= TCQ_F_CAN_BYPASS;
756 return 0;
757 }
758
759 static void pfifo_fast_destroy(struct Qdisc *sch)
760 {
761 struct pfifo_fast_priv *priv = qdisc_priv(sch);
762 int prio;
763
764 for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
765 struct skb_array *q = band2list(priv, prio);
766
767 /* NULL ring is possible if destroy path is due to a failed
768 * skb_array_init() in pfifo_fast_init() case.
769 */
770 if (!q->ring.queue)
771 continue;
772 /* Destroy ring but no need to kfree_skb because a call to
773 * pfifo_fast_reset() has already done that work.
774 */
775 ptr_ring_cleanup(&q->ring, NULL);
776 }
777 }
778
779 static int pfifo_fast_change_tx_queue_len(struct Qdisc *sch,
780 unsigned int new_len)
781 {
782 struct pfifo_fast_priv *priv = qdisc_priv(sch);
783 struct skb_array *bands[PFIFO_FAST_BANDS];
784 int prio;
785
786 for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
787 struct skb_array *q = band2list(priv, prio);
788
789 bands[prio] = q;
790 }
791
792 return skb_array_resize_multiple(bands, PFIFO_FAST_BANDS, new_len,
793 GFP_KERNEL);
794 }
795
796 struct Qdisc_ops pfifo_fast_ops __read_mostly = {
797 .id = "pfifo_fast",
798 .priv_size = sizeof(struct pfifo_fast_priv),
799 .enqueue = pfifo_fast_enqueue,
800 .dequeue = pfifo_fast_dequeue,
801 .peek = pfifo_fast_peek,
802 .init = pfifo_fast_init,
803 .destroy = pfifo_fast_destroy,
804 .reset = pfifo_fast_reset,
805 .dump = pfifo_fast_dump,
806 .change_tx_queue_len = pfifo_fast_change_tx_queue_len,
807 .owner = THIS_MODULE,
808 .static_flags = TCQ_F_NOLOCK | TCQ_F_CPUSTATS,
809 };
810 EXPORT_SYMBOL(pfifo_fast_ops);
811
812 static struct lock_class_key qdisc_tx_busylock;
813 static struct lock_class_key qdisc_running_key;
814
815 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
816 const struct Qdisc_ops *ops,
817 struct netlink_ext_ack *extack)
818 {
819 void *p;
820 struct Qdisc *sch;
821 unsigned int size = QDISC_ALIGN(sizeof(*sch)) + ops->priv_size;
822 int err = -ENOBUFS;
823 struct net_device *dev;
824
825 if (!dev_queue) {
826 NL_SET_ERR_MSG(extack, "No device queue given");
827 err = -EINVAL;
828 goto errout;
829 }
830
831 dev = dev_queue->dev;
832 p = kzalloc_node(size, GFP_KERNEL,
833 netdev_queue_numa_node_read(dev_queue));
834
835 if (!p)
836 goto errout;
837 sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p);
838 /* if we got non aligned memory, ask more and do alignment ourself */
839 if (sch != p) {
840 kfree(p);
841 p = kzalloc_node(size + QDISC_ALIGNTO - 1, GFP_KERNEL,
842 netdev_queue_numa_node_read(dev_queue));
843 if (!p)
844 goto errout;
845 sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p);
846 sch->padded = (char *) sch - (char *) p;
847 }
848 __skb_queue_head_init(&sch->gso_skb);
849 __skb_queue_head_init(&sch->skb_bad_txq);
850 qdisc_skb_head_init(&sch->q);
851 spin_lock_init(&sch->q.lock);
852
853 if (ops->static_flags & TCQ_F_CPUSTATS) {
854 sch->cpu_bstats =
855 netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
856 if (!sch->cpu_bstats)
857 goto errout1;
858
859 sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
860 if (!sch->cpu_qstats) {
861 free_percpu(sch->cpu_bstats);
862 goto errout1;
863 }
864 }
865
866 spin_lock_init(&sch->busylock);
867 lockdep_set_class(&sch->busylock,
868 dev->qdisc_tx_busylock ?: &qdisc_tx_busylock);
869
870 /* seqlock has the same scope of busylock, for NOLOCK qdisc */
871 spin_lock_init(&sch->seqlock);
872 lockdep_set_class(&sch->busylock,
873 dev->qdisc_tx_busylock ?: &qdisc_tx_busylock);
874
875 seqcount_init(&sch->running);
876 lockdep_set_class(&sch->running,
877 dev->qdisc_running_key ?: &qdisc_running_key);
878
879 sch->ops = ops;
880 sch->flags = ops->static_flags;
881 sch->enqueue = ops->enqueue;
882 sch->dequeue = ops->dequeue;
883 sch->dev_queue = dev_queue;
884 dev_hold(dev);
885 refcount_set(&sch->refcnt, 1);
886
887 return sch;
888 errout1:
889 kfree(p);
890 errout:
891 return ERR_PTR(err);
892 }
893
894 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
895 const struct Qdisc_ops *ops,
896 unsigned int parentid,
897 struct netlink_ext_ack *extack)
898 {
899 struct Qdisc *sch;
900
901 if (!try_module_get(ops->owner)) {
902 NL_SET_ERR_MSG(extack, "Failed to increase module reference counter");
903 return NULL;
904 }
905
906 sch = qdisc_alloc(dev_queue, ops, extack);
907 if (IS_ERR(sch)) {
908 module_put(ops->owner);
909 return NULL;
910 }
911 sch->parent = parentid;
912
913 if (!ops->init || ops->init(sch, NULL, extack) == 0)
914 return sch;
915
916 qdisc_put(sch);
917 return NULL;
918 }
919 EXPORT_SYMBOL(qdisc_create_dflt);
920
921 /* Under qdisc_lock(qdisc) and BH! */
922
923 void qdisc_reset(struct Qdisc *qdisc)
924 {
925 const struct Qdisc_ops *ops = qdisc->ops;
926 struct sk_buff *skb, *tmp;
927
928 if (ops->reset)
929 ops->reset(qdisc);
930
931 skb_queue_walk_safe(&qdisc->gso_skb, skb, tmp) {
932 __skb_unlink(skb, &qdisc->gso_skb);
933 kfree_skb_list(skb);
934 }
935
936 skb_queue_walk_safe(&qdisc->skb_bad_txq, skb, tmp) {
937 __skb_unlink(skb, &qdisc->skb_bad_txq);
938 kfree_skb_list(skb);
939 }
940
941 qdisc->q.qlen = 0;
942 qdisc->qstats.backlog = 0;
943 }
944 EXPORT_SYMBOL(qdisc_reset);
945
946 void qdisc_free(struct Qdisc *qdisc)
947 {
948 if (qdisc_is_percpu_stats(qdisc)) {
949 free_percpu(qdisc->cpu_bstats);
950 free_percpu(qdisc->cpu_qstats);
951 }
952
953 kfree((char *) qdisc - qdisc->padded);
954 }
955
956 static void qdisc_free_cb(struct rcu_head *head)
957 {
958 struct Qdisc *q = container_of(head, struct Qdisc, rcu);
959
960 qdisc_free(q);
961 }
962
963 static void qdisc_destroy(struct Qdisc *qdisc)
964 {
965 const struct Qdisc_ops *ops = qdisc->ops;
966 struct sk_buff *skb, *tmp;
967
968 #ifdef CONFIG_NET_SCHED
969 qdisc_hash_del(qdisc);
970
971 qdisc_put_stab(rtnl_dereference(qdisc->stab));
972 #endif
973 gen_kill_estimator(&qdisc->rate_est);
974 if (ops->reset)
975 ops->reset(qdisc);
976 if (ops->destroy)
977 ops->destroy(qdisc);
978
979 module_put(ops->owner);
980 dev_put(qdisc_dev(qdisc));
981
982 skb_queue_walk_safe(&qdisc->gso_skb, skb, tmp) {
983 __skb_unlink(skb, &qdisc->gso_skb);
984 kfree_skb_list(skb);
985 }
986
987 skb_queue_walk_safe(&qdisc->skb_bad_txq, skb, tmp) {
988 __skb_unlink(skb, &qdisc->skb_bad_txq);
989 kfree_skb_list(skb);
990 }
991
992 call_rcu(&qdisc->rcu, qdisc_free_cb);
993 }
994
995 void qdisc_put(struct Qdisc *qdisc)
996 {
997 if (qdisc->flags & TCQ_F_BUILTIN ||
998 !refcount_dec_and_test(&qdisc->refcnt))
999 return;
1000
1001 qdisc_destroy(qdisc);
1002 }
1003 EXPORT_SYMBOL(qdisc_put);
1004
1005 /* Version of qdisc_put() that is called with rtnl mutex unlocked.
1006 * Intended to be used as optimization, this function only takes rtnl lock if
1007 * qdisc reference counter reached zero.
1008 */
1009
1010 void qdisc_put_unlocked(struct Qdisc *qdisc)
1011 {
1012 if (qdisc->flags & TCQ_F_BUILTIN ||
1013 !refcount_dec_and_rtnl_lock(&qdisc->refcnt))
1014 return;
1015
1016 qdisc_destroy(qdisc);
1017 rtnl_unlock();
1018 }
1019 EXPORT_SYMBOL(qdisc_put_unlocked);
1020
1021 /* Attach toplevel qdisc to device queue. */
1022 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
1023 struct Qdisc *qdisc)
1024 {
1025 struct Qdisc *oqdisc = dev_queue->qdisc_sleeping;
1026 spinlock_t *root_lock;
1027
1028 root_lock = qdisc_lock(oqdisc);
1029 spin_lock_bh(root_lock);
1030
1031 /* ... and graft new one */
1032 if (qdisc == NULL)
1033 qdisc = &noop_qdisc;
1034 dev_queue->qdisc_sleeping = qdisc;
1035 rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc);
1036
1037 spin_unlock_bh(root_lock);
1038
1039 return oqdisc;
1040 }
1041 EXPORT_SYMBOL(dev_graft_qdisc);
1042
1043 static void attach_one_default_qdisc(struct net_device *dev,
1044 struct netdev_queue *dev_queue,
1045 void *_unused)
1046 {
1047 struct Qdisc *qdisc;
1048 const struct Qdisc_ops *ops = default_qdisc_ops;
1049
1050 if (dev->priv_flags & IFF_NO_QUEUE)
1051 ops = &noqueue_qdisc_ops;
1052
1053 qdisc = qdisc_create_dflt(dev_queue, ops, TC_H_ROOT, NULL);
1054 if (!qdisc) {
1055 netdev_info(dev, "activation failed\n");
1056 return;
1057 }
1058 if (!netif_is_multiqueue(dev))
1059 qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
1060 dev_queue->qdisc_sleeping = qdisc;
1061 }
1062
1063 static void attach_default_qdiscs(struct net_device *dev)
1064 {
1065 struct netdev_queue *txq;
1066 struct Qdisc *qdisc;
1067
1068 txq = netdev_get_tx_queue(dev, 0);
1069
1070 if (!netif_is_multiqueue(dev) ||
1071 dev->priv_flags & IFF_NO_QUEUE) {
1072 netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL);
1073 dev->qdisc = txq->qdisc_sleeping;
1074 qdisc_refcount_inc(dev->qdisc);
1075 } else {
1076 qdisc = qdisc_create_dflt(txq, &mq_qdisc_ops, TC_H_ROOT, NULL);
1077 if (qdisc) {
1078 dev->qdisc = qdisc;
1079 qdisc->ops->attach(qdisc);
1080 }
1081 }
1082 #ifdef CONFIG_NET_SCHED
1083 if (dev->qdisc != &noop_qdisc)
1084 qdisc_hash_add(dev->qdisc, false);
1085 #endif
1086 }
1087
1088 static void transition_one_qdisc(struct net_device *dev,
1089 struct netdev_queue *dev_queue,
1090 void *_need_watchdog)
1091 {
1092 struct Qdisc *new_qdisc = dev_queue->qdisc_sleeping;
1093 int *need_watchdog_p = _need_watchdog;
1094
1095 if (!(new_qdisc->flags & TCQ_F_BUILTIN))
1096 clear_bit(__QDISC_STATE_DEACTIVATED, &new_qdisc->state);
1097
1098 rcu_assign_pointer(dev_queue->qdisc, new_qdisc);
1099 if (need_watchdog_p) {
1100 dev_queue->trans_start = 0;
1101 *need_watchdog_p = 1;
1102 }
1103 }
1104
1105 void dev_activate(struct net_device *dev)
1106 {
1107 int need_watchdog;
1108
1109 /* No queueing discipline is attached to device;
1110 * create default one for devices, which need queueing
1111 * and noqueue_qdisc for virtual interfaces
1112 */
1113
1114 if (dev->qdisc == &noop_qdisc)
1115 attach_default_qdiscs(dev);
1116
1117 if (!netif_carrier_ok(dev))
1118 /* Delay activation until next carrier-on event */
1119 return;
1120
1121 need_watchdog = 0;
1122 netdev_for_each_tx_queue(dev, transition_one_qdisc, &need_watchdog);
1123 if (dev_ingress_queue(dev))
1124 transition_one_qdisc(dev, dev_ingress_queue(dev), NULL);
1125
1126 if (need_watchdog) {
1127 netif_trans_update(dev);
1128 dev_watchdog_up(dev);
1129 }
1130 }
1131 EXPORT_SYMBOL(dev_activate);
1132
1133 static void dev_deactivate_queue(struct net_device *dev,
1134 struct netdev_queue *dev_queue,
1135 void *_qdisc_default)
1136 {
1137 struct Qdisc *qdisc_default = _qdisc_default;
1138 struct Qdisc *qdisc;
1139
1140 qdisc = rtnl_dereference(dev_queue->qdisc);
1141 if (qdisc) {
1142 bool nolock = qdisc->flags & TCQ_F_NOLOCK;
1143
1144 if (nolock)
1145 spin_lock_bh(&qdisc->seqlock);
1146 spin_lock_bh(qdisc_lock(qdisc));
1147
1148 if (!(qdisc->flags & TCQ_F_BUILTIN))
1149 set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state);
1150
1151 rcu_assign_pointer(dev_queue->qdisc, qdisc_default);
1152 qdisc_reset(qdisc);
1153
1154 spin_unlock_bh(qdisc_lock(qdisc));
1155 if (nolock)
1156 spin_unlock_bh(&qdisc->seqlock);
1157 }
1158 }
1159
1160 static bool some_qdisc_is_busy(struct net_device *dev)
1161 {
1162 unsigned int i;
1163
1164 for (i = 0; i < dev->num_tx_queues; i++) {
1165 struct netdev_queue *dev_queue;
1166 spinlock_t *root_lock;
1167 struct Qdisc *q;
1168 int val;
1169
1170 dev_queue = netdev_get_tx_queue(dev, i);
1171 q = dev_queue->qdisc_sleeping;
1172
1173 root_lock = qdisc_lock(q);
1174 spin_lock_bh(root_lock);
1175
1176 val = (qdisc_is_running(q) ||
1177 test_bit(__QDISC_STATE_SCHED, &q->state));
1178
1179 spin_unlock_bh(root_lock);
1180
1181 if (val)
1182 return true;
1183 }
1184 return false;
1185 }
1186
1187 static void dev_qdisc_reset(struct net_device *dev,
1188 struct netdev_queue *dev_queue,
1189 void *none)
1190 {
1191 struct Qdisc *qdisc = dev_queue->qdisc_sleeping;
1192
1193 if (qdisc)
1194 qdisc_reset(qdisc);
1195 }
1196
1197 /**
1198 * dev_deactivate_many - deactivate transmissions on several devices
1199 * @head: list of devices to deactivate
1200 *
1201 * This function returns only when all outstanding transmissions
1202 * have completed, unless all devices are in dismantle phase.
1203 */
1204 void dev_deactivate_many(struct list_head *head)
1205 {
1206 struct net_device *dev;
1207
1208 list_for_each_entry(dev, head, close_list) {
1209 netdev_for_each_tx_queue(dev, dev_deactivate_queue,
1210 &noop_qdisc);
1211 if (dev_ingress_queue(dev))
1212 dev_deactivate_queue(dev, dev_ingress_queue(dev),
1213 &noop_qdisc);
1214
1215 dev_watchdog_down(dev);
1216 }
1217
1218 /* Wait for outstanding qdisc-less dev_queue_xmit calls.
1219 * This is avoided if all devices are in dismantle phase :
1220 * Caller will call synchronize_net() for us
1221 */
1222 synchronize_net();
1223
1224 /* Wait for outstanding qdisc_run calls. */
1225 list_for_each_entry(dev, head, close_list) {
1226 while (some_qdisc_is_busy(dev))
1227 yield();
1228 /* The new qdisc is assigned at this point so we can safely
1229 * unwind stale skb lists and qdisc statistics
1230 */
1231 netdev_for_each_tx_queue(dev, dev_qdisc_reset, NULL);
1232 if (dev_ingress_queue(dev))
1233 dev_qdisc_reset(dev, dev_ingress_queue(dev), NULL);
1234 }
1235 }
1236
1237 void dev_deactivate(struct net_device *dev)
1238 {
1239 LIST_HEAD(single);
1240
1241 list_add(&dev->close_list, &single);
1242 dev_deactivate_many(&single);
1243 list_del(&single);
1244 }
1245 EXPORT_SYMBOL(dev_deactivate);
1246
1247 static int qdisc_change_tx_queue_len(struct net_device *dev,
1248 struct netdev_queue *dev_queue)
1249 {
1250 struct Qdisc *qdisc = dev_queue->qdisc_sleeping;
1251 const struct Qdisc_ops *ops = qdisc->ops;
1252
1253 if (ops->change_tx_queue_len)
1254 return ops->change_tx_queue_len(qdisc, dev->tx_queue_len);
1255 return 0;
1256 }
1257
1258 int dev_qdisc_change_tx_queue_len(struct net_device *dev)
1259 {
1260 bool up = dev->flags & IFF_UP;
1261 unsigned int i;
1262 int ret = 0;
1263
1264 if (up)
1265 dev_deactivate(dev);
1266
1267 for (i = 0; i < dev->num_tx_queues; i++) {
1268 ret = qdisc_change_tx_queue_len(dev, &dev->_tx[i]);
1269
1270 /* TODO: revert changes on a partial failure */
1271 if (ret)
1272 break;
1273 }
1274
1275 if (up)
1276 dev_activate(dev);
1277 return ret;
1278 }
1279
1280 static void dev_init_scheduler_queue(struct net_device *dev,
1281 struct netdev_queue *dev_queue,
1282 void *_qdisc)
1283 {
1284 struct Qdisc *qdisc = _qdisc;
1285
1286 rcu_assign_pointer(dev_queue->qdisc, qdisc);
1287 dev_queue->qdisc_sleeping = qdisc;
1288 }
1289
1290 void dev_init_scheduler(struct net_device *dev)
1291 {
1292 dev->qdisc = &noop_qdisc;
1293 netdev_for_each_tx_queue(dev, dev_init_scheduler_queue, &noop_qdisc);
1294 if (dev_ingress_queue(dev))
1295 dev_init_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc);
1296
1297 timer_setup(&dev->watchdog_timer, dev_watchdog, 0);
1298 }
1299
1300 static void shutdown_scheduler_queue(struct net_device *dev,
1301 struct netdev_queue *dev_queue,
1302 void *_qdisc_default)
1303 {
1304 struct Qdisc *qdisc = dev_queue->qdisc_sleeping;
1305 struct Qdisc *qdisc_default = _qdisc_default;
1306
1307 if (qdisc) {
1308 rcu_assign_pointer(dev_queue->qdisc, qdisc_default);
1309 dev_queue->qdisc_sleeping = qdisc_default;
1310
1311 qdisc_put(qdisc);
1312 }
1313 }
1314
1315 void dev_shutdown(struct net_device *dev)
1316 {
1317 netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc);
1318 if (dev_ingress_queue(dev))
1319 shutdown_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc);
1320 qdisc_put(dev->qdisc);
1321 dev->qdisc = &noop_qdisc;
1322
1323 WARN_ON(timer_pending(&dev->watchdog_timer));
1324 }
1325
1326 void psched_ratecfg_precompute(struct psched_ratecfg *r,
1327 const struct tc_ratespec *conf,
1328 u64 rate64)
1329 {
1330 memset(r, 0, sizeof(*r));
1331 r->overhead = conf->overhead;
1332 r->rate_bytes_ps = max_t(u64, conf->rate, rate64);
1333 r->linklayer = (conf->linklayer & TC_LINKLAYER_MASK);
1334 r->mult = 1;
1335 /*
1336 * The deal here is to replace a divide by a reciprocal one
1337 * in fast path (a reciprocal divide is a multiply and a shift)
1338 *
1339 * Normal formula would be :
1340 * time_in_ns = (NSEC_PER_SEC * len) / rate_bps
1341 *
1342 * We compute mult/shift to use instead :
1343 * time_in_ns = (len * mult) >> shift;
1344 *
1345 * We try to get the highest possible mult value for accuracy,
1346 * but have to make sure no overflows will ever happen.
1347 */
1348 if (r->rate_bytes_ps > 0) {
1349 u64 factor = NSEC_PER_SEC;
1350
1351 for (;;) {
1352 r->mult = div64_u64(factor, r->rate_bytes_ps);
1353 if (r->mult & (1U << 31) || factor & (1ULL << 63))
1354 break;
1355 factor <<= 1;
1356 r->shift++;
1357 }
1358 }
1359 }
1360 EXPORT_SYMBOL(psched_ratecfg_precompute);
1361
1362 static void mini_qdisc_rcu_func(struct rcu_head *head)
1363 {
1364 }
1365
1366 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
1367 struct tcf_proto *tp_head)
1368 {
1369 struct mini_Qdisc *miniq_old = rtnl_dereference(*miniqp->p_miniq);
1370 struct mini_Qdisc *miniq;
1371
1372 if (!tp_head) {
1373 RCU_INIT_POINTER(*miniqp->p_miniq, NULL);
1374 /* Wait for flying RCU callback before it is freed. */
1375 rcu_barrier();
1376 return;
1377 }
1378
1379 miniq = !miniq_old || miniq_old == &miniqp->miniq2 ?
1380 &miniqp->miniq1 : &miniqp->miniq2;
1381
1382 /* We need to make sure that readers won't see the miniq
1383 * we are about to modify. So wait until previous call_rcu callback
1384 * is done.
1385 */
1386 rcu_barrier();
1387 miniq->filter_list = tp_head;
1388 rcu_assign_pointer(*miniqp->p_miniq, miniq);
1389
1390 if (miniq_old)
1391 /* This is counterpart of the rcu barriers above. We need to
1392 * block potential new user of miniq_old until all readers
1393 * are not seeing it.
1394 */
1395 call_rcu(&miniq_old->rcu, mini_qdisc_rcu_func);
1396 }
1397 EXPORT_SYMBOL(mini_qdisc_pair_swap);
1398
1399 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
1400 struct mini_Qdisc __rcu **p_miniq)
1401 {
1402 miniqp->miniq1.cpu_bstats = qdisc->cpu_bstats;
1403 miniqp->miniq1.cpu_qstats = qdisc->cpu_qstats;
1404 miniqp->miniq2.cpu_bstats = qdisc->cpu_bstats;
1405 miniqp->miniq2.cpu_qstats = qdisc->cpu_qstats;
1406 miniqp->p_miniq = p_miniq;
1407 }
1408 EXPORT_SYMBOL(mini_qdisc_pair_init);
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