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1da177e4 LT |
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 <asm/uaccess.h> | |
15 | #include <asm/system.h> | |
16 | #include <linux/bitops.h> | |
17 | #include <linux/config.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/socket.h> | |
25 | #include <linux/sockios.h> | |
26 | #include <linux/in.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/interrupt.h> | |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/skbuff.h> | |
31 | #include <linux/rtnetlink.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/rcupdate.h> | |
34 | #include <linux/list.h> | |
35 | #include <net/sock.h> | |
36 | #include <net/pkt_sched.h> | |
37 | ||
38 | /* Main transmission queue. */ | |
39 | ||
40 | /* Main qdisc structure lock. | |
41 | ||
42 | However, modifications | |
43 | to data, participating in scheduling must be additionally | |
44 | protected with dev->queue_lock spinlock. | |
45 | ||
46 | The idea is the following: | |
47 | - enqueue, dequeue are serialized via top level device | |
48 | spinlock dev->queue_lock. | |
49 | - tree walking is protected by read_lock_bh(qdisc_tree_lock) | |
50 | and this lock is used only in process context. | |
51 | - updates to tree are made under rtnl semaphore or | |
52 | from softirq context (__qdisc_destroy rcu-callback) | |
53 | hence this lock needs local bh disabling. | |
54 | ||
55 | qdisc_tree_lock must be grabbed BEFORE dev->queue_lock! | |
56 | */ | |
57 | DEFINE_RWLOCK(qdisc_tree_lock); | |
58 | ||
59 | void qdisc_lock_tree(struct net_device *dev) | |
60 | { | |
61 | write_lock_bh(&qdisc_tree_lock); | |
62 | spin_lock_bh(&dev->queue_lock); | |
63 | } | |
64 | ||
65 | void qdisc_unlock_tree(struct net_device *dev) | |
66 | { | |
67 | spin_unlock_bh(&dev->queue_lock); | |
68 | write_unlock_bh(&qdisc_tree_lock); | |
69 | } | |
70 | ||
71 | /* | |
72 | dev->queue_lock serializes queue accesses for this device | |
73 | AND dev->qdisc pointer itself. | |
74 | ||
75 | dev->xmit_lock serializes accesses to device driver. | |
76 | ||
77 | dev->queue_lock and dev->xmit_lock are mutually exclusive, | |
78 | if one is grabbed, another must be free. | |
79 | */ | |
80 | ||
81 | ||
82 | /* Kick device. | |
83 | Note, that this procedure can be called by a watchdog timer, so that | |
84 | we do not check dev->tbusy flag here. | |
85 | ||
86 | Returns: 0 - queue is empty. | |
87 | >0 - queue is not empty, but throttled. | |
88 | <0 - queue is not empty. Device is throttled, if dev->tbusy != 0. | |
89 | ||
90 | NOTE: Called under dev->queue_lock with locally disabled BH. | |
91 | */ | |
92 | ||
93 | int qdisc_restart(struct net_device *dev) | |
94 | { | |
95 | struct Qdisc *q = dev->qdisc; | |
96 | struct sk_buff *skb; | |
97 | ||
98 | /* Dequeue packet */ | |
99 | if ((skb = q->dequeue(q)) != NULL) { | |
100 | unsigned nolock = (dev->features & NETIF_F_LLTX); | |
101 | /* | |
102 | * When the driver has LLTX set it does its own locking | |
103 | * in start_xmit. No need to add additional overhead by | |
104 | * locking again. These checks are worth it because | |
105 | * even uncongested locks can be quite expensive. | |
106 | * The driver can do trylock like here too, in case | |
107 | * of lock congestion it should return -1 and the packet | |
108 | * will be requeued. | |
109 | */ | |
110 | if (!nolock) { | |
111 | if (!spin_trylock(&dev->xmit_lock)) { | |
112 | collision: | |
113 | /* So, someone grabbed the driver. */ | |
114 | ||
115 | /* It may be transient configuration error, | |
116 | when hard_start_xmit() recurses. We detect | |
117 | it by checking xmit owner and drop the | |
118 | packet when deadloop is detected. | |
119 | */ | |
120 | if (dev->xmit_lock_owner == smp_processor_id()) { | |
121 | kfree_skb(skb); | |
122 | if (net_ratelimit()) | |
123 | printk(KERN_DEBUG "Dead loop on netdevice %s, fix it urgently!\n", dev->name); | |
124 | return -1; | |
125 | } | |
126 | __get_cpu_var(netdev_rx_stat).cpu_collision++; | |
127 | goto requeue; | |
128 | } | |
129 | /* Remember that the driver is grabbed by us. */ | |
130 | dev->xmit_lock_owner = smp_processor_id(); | |
131 | } | |
132 | ||
133 | { | |
134 | /* And release queue */ | |
135 | spin_unlock(&dev->queue_lock); | |
136 | ||
137 | if (!netif_queue_stopped(dev)) { | |
138 | int ret; | |
139 | if (netdev_nit) | |
140 | dev_queue_xmit_nit(skb, dev); | |
141 | ||
142 | ret = dev->hard_start_xmit(skb, dev); | |
143 | if (ret == NETDEV_TX_OK) { | |
144 | if (!nolock) { | |
145 | dev->xmit_lock_owner = -1; | |
146 | spin_unlock(&dev->xmit_lock); | |
147 | } | |
148 | spin_lock(&dev->queue_lock); | |
149 | return -1; | |
150 | } | |
151 | if (ret == NETDEV_TX_LOCKED && nolock) { | |
152 | spin_lock(&dev->queue_lock); | |
153 | goto collision; | |
154 | } | |
155 | } | |
156 | ||
157 | /* NETDEV_TX_BUSY - we need to requeue */ | |
158 | /* Release the driver */ | |
159 | if (!nolock) { | |
160 | dev->xmit_lock_owner = -1; | |
161 | spin_unlock(&dev->xmit_lock); | |
162 | } | |
163 | spin_lock(&dev->queue_lock); | |
164 | q = dev->qdisc; | |
165 | } | |
166 | ||
167 | /* Device kicked us out :( | |
168 | This is possible in three cases: | |
169 | ||
170 | 0. driver is locked | |
171 | 1. fastroute is enabled | |
172 | 2. device cannot determine busy state | |
173 | before start of transmission (f.e. dialout) | |
174 | 3. device is buggy (ppp) | |
175 | */ | |
176 | ||
177 | requeue: | |
178 | q->ops->requeue(skb, q); | |
179 | netif_schedule(dev); | |
180 | return 1; | |
181 | } | |
8cbe1d46 | 182 | BUG_ON((int) q->q.qlen < 0); |
1da177e4 LT |
183 | return q->q.qlen; |
184 | } | |
185 | ||
186 | static void dev_watchdog(unsigned long arg) | |
187 | { | |
188 | struct net_device *dev = (struct net_device *)arg; | |
189 | ||
190 | spin_lock(&dev->xmit_lock); | |
191 | if (dev->qdisc != &noop_qdisc) { | |
192 | if (netif_device_present(dev) && | |
193 | netif_running(dev) && | |
194 | netif_carrier_ok(dev)) { | |
195 | if (netif_queue_stopped(dev) && | |
196 | (jiffies - dev->trans_start) > dev->watchdog_timeo) { | |
197 | printk(KERN_INFO "NETDEV WATCHDOG: %s: transmit timed out\n", dev->name); | |
198 | dev->tx_timeout(dev); | |
199 | } | |
200 | if (!mod_timer(&dev->watchdog_timer, jiffies + dev->watchdog_timeo)) | |
201 | dev_hold(dev); | |
202 | } | |
203 | } | |
204 | spin_unlock(&dev->xmit_lock); | |
205 | ||
206 | dev_put(dev); | |
207 | } | |
208 | ||
209 | static void dev_watchdog_init(struct net_device *dev) | |
210 | { | |
211 | init_timer(&dev->watchdog_timer); | |
212 | dev->watchdog_timer.data = (unsigned long)dev; | |
213 | dev->watchdog_timer.function = dev_watchdog; | |
214 | } | |
215 | ||
216 | void __netdev_watchdog_up(struct net_device *dev) | |
217 | { | |
218 | if (dev->tx_timeout) { | |
219 | if (dev->watchdog_timeo <= 0) | |
220 | dev->watchdog_timeo = 5*HZ; | |
221 | if (!mod_timer(&dev->watchdog_timer, jiffies + dev->watchdog_timeo)) | |
222 | dev_hold(dev); | |
223 | } | |
224 | } | |
225 | ||
226 | static void dev_watchdog_up(struct net_device *dev) | |
227 | { | |
228 | spin_lock_bh(&dev->xmit_lock); | |
229 | __netdev_watchdog_up(dev); | |
230 | spin_unlock_bh(&dev->xmit_lock); | |
231 | } | |
232 | ||
233 | static void dev_watchdog_down(struct net_device *dev) | |
234 | { | |
235 | spin_lock_bh(&dev->xmit_lock); | |
236 | if (del_timer(&dev->watchdog_timer)) | |
237 | __dev_put(dev); | |
238 | spin_unlock_bh(&dev->xmit_lock); | |
239 | } | |
240 | ||
241 | /* "NOOP" scheduler: the best scheduler, recommended for all interfaces | |
242 | under all circumstances. It is difficult to invent anything faster or | |
243 | cheaper. | |
244 | */ | |
245 | ||
246 | static int | |
247 | noop_enqueue(struct sk_buff *skb, struct Qdisc * qdisc) | |
248 | { | |
249 | kfree_skb(skb); | |
250 | return NET_XMIT_CN; | |
251 | } | |
252 | ||
253 | static struct sk_buff * | |
254 | noop_dequeue(struct Qdisc * qdisc) | |
255 | { | |
256 | return NULL; | |
257 | } | |
258 | ||
259 | static int | |
260 | noop_requeue(struct sk_buff *skb, struct Qdisc* qdisc) | |
261 | { | |
262 | if (net_ratelimit()) | |
263 | printk(KERN_DEBUG "%s deferred output. It is buggy.\n", skb->dev->name); | |
264 | kfree_skb(skb); | |
265 | return NET_XMIT_CN; | |
266 | } | |
267 | ||
268 | struct Qdisc_ops noop_qdisc_ops = { | |
269 | .next = NULL, | |
270 | .cl_ops = NULL, | |
271 | .id = "noop", | |
272 | .priv_size = 0, | |
273 | .enqueue = noop_enqueue, | |
274 | .dequeue = noop_dequeue, | |
275 | .requeue = noop_requeue, | |
276 | .owner = THIS_MODULE, | |
277 | }; | |
278 | ||
279 | struct Qdisc noop_qdisc = { | |
280 | .enqueue = noop_enqueue, | |
281 | .dequeue = noop_dequeue, | |
282 | .flags = TCQ_F_BUILTIN, | |
283 | .ops = &noop_qdisc_ops, | |
284 | .list = LIST_HEAD_INIT(noop_qdisc.list), | |
285 | }; | |
286 | ||
287 | static struct Qdisc_ops noqueue_qdisc_ops = { | |
288 | .next = NULL, | |
289 | .cl_ops = NULL, | |
290 | .id = "noqueue", | |
291 | .priv_size = 0, | |
292 | .enqueue = noop_enqueue, | |
293 | .dequeue = noop_dequeue, | |
294 | .requeue = noop_requeue, | |
295 | .owner = THIS_MODULE, | |
296 | }; | |
297 | ||
298 | static struct Qdisc noqueue_qdisc = { | |
299 | .enqueue = NULL, | |
300 | .dequeue = noop_dequeue, | |
301 | .flags = TCQ_F_BUILTIN, | |
302 | .ops = &noqueue_qdisc_ops, | |
303 | .list = LIST_HEAD_INIT(noqueue_qdisc.list), | |
304 | }; | |
305 | ||
306 | ||
307 | static const u8 prio2band[TC_PRIO_MAX+1] = | |
308 | { 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 }; | |
309 | ||
310 | /* 3-band FIFO queue: old style, but should be a bit faster than | |
311 | generic prio+fifo combination. | |
312 | */ | |
313 | ||
f87a9c3d TG |
314 | #define PFIFO_FAST_BANDS 3 |
315 | ||
321090e7 TG |
316 | static inline struct sk_buff_head *prio2list(struct sk_buff *skb, |
317 | struct Qdisc *qdisc) | |
1da177e4 LT |
318 | { |
319 | struct sk_buff_head *list = qdisc_priv(qdisc); | |
321090e7 TG |
320 | return list + prio2band[skb->priority & TC_PRIO_MAX]; |
321 | } | |
1da177e4 | 322 | |
f87a9c3d | 323 | static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc* qdisc) |
321090e7 TG |
324 | { |
325 | struct sk_buff_head *list = prio2list(skb, qdisc); | |
1da177e4 | 326 | |
821d24ae | 327 | if (skb_queue_len(list) < qdisc->dev->tx_queue_len) { |
1da177e4 | 328 | qdisc->q.qlen++; |
821d24ae | 329 | return __qdisc_enqueue_tail(skb, qdisc, list); |
1da177e4 | 330 | } |
821d24ae TG |
331 | |
332 | return qdisc_drop(skb, qdisc); | |
1da177e4 LT |
333 | } |
334 | ||
f87a9c3d | 335 | static struct sk_buff *pfifo_fast_dequeue(struct Qdisc* qdisc) |
1da177e4 LT |
336 | { |
337 | int prio; | |
338 | struct sk_buff_head *list = qdisc_priv(qdisc); | |
1da177e4 | 339 | |
f87a9c3d | 340 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++, list++) { |
821d24ae | 341 | struct sk_buff *skb = __qdisc_dequeue_head(qdisc, list); |
1da177e4 LT |
342 | if (skb) { |
343 | qdisc->q.qlen--; | |
344 | return skb; | |
345 | } | |
346 | } | |
f87a9c3d | 347 | |
1da177e4 LT |
348 | return NULL; |
349 | } | |
350 | ||
f87a9c3d | 351 | static int pfifo_fast_requeue(struct sk_buff *skb, struct Qdisc* qdisc) |
1da177e4 | 352 | { |
1da177e4 | 353 | qdisc->q.qlen++; |
321090e7 | 354 | return __qdisc_requeue(skb, qdisc, prio2list(skb, qdisc)); |
1da177e4 LT |
355 | } |
356 | ||
f87a9c3d | 357 | static void pfifo_fast_reset(struct Qdisc* qdisc) |
1da177e4 LT |
358 | { |
359 | int prio; | |
360 | struct sk_buff_head *list = qdisc_priv(qdisc); | |
361 | ||
f87a9c3d | 362 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
821d24ae TG |
363 | __qdisc_reset_queue(qdisc, list + prio); |
364 | ||
365 | qdisc->qstats.backlog = 0; | |
1da177e4 LT |
366 | qdisc->q.qlen = 0; |
367 | } | |
368 | ||
369 | static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) | |
370 | { | |
f87a9c3d | 371 | struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; |
1da177e4 | 372 | |
1da177e4 LT |
373 | memcpy(&opt.priomap, prio2band, TC_PRIO_MAX+1); |
374 | RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt); | |
375 | return skb->len; | |
376 | ||
377 | rtattr_failure: | |
1da177e4 LT |
378 | return -1; |
379 | } | |
380 | ||
381 | static int pfifo_fast_init(struct Qdisc *qdisc, struct rtattr *opt) | |
382 | { | |
f87a9c3d | 383 | int prio; |
1da177e4 LT |
384 | struct sk_buff_head *list = qdisc_priv(qdisc); |
385 | ||
f87a9c3d TG |
386 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
387 | skb_queue_head_init(list + prio); | |
1da177e4 LT |
388 | |
389 | return 0; | |
390 | } | |
391 | ||
392 | static struct Qdisc_ops pfifo_fast_ops = { | |
1da177e4 | 393 | .id = "pfifo_fast", |
f87a9c3d | 394 | .priv_size = PFIFO_FAST_BANDS * sizeof(struct sk_buff_head), |
1da177e4 LT |
395 | .enqueue = pfifo_fast_enqueue, |
396 | .dequeue = pfifo_fast_dequeue, | |
397 | .requeue = pfifo_fast_requeue, | |
398 | .init = pfifo_fast_init, | |
399 | .reset = pfifo_fast_reset, | |
400 | .dump = pfifo_fast_dump, | |
401 | .owner = THIS_MODULE, | |
402 | }; | |
403 | ||
404 | struct Qdisc * qdisc_create_dflt(struct net_device *dev, struct Qdisc_ops *ops) | |
405 | { | |
406 | void *p; | |
407 | struct Qdisc *sch; | |
408 | int size; | |
409 | ||
410 | /* ensure that the Qdisc and the private data are 32-byte aligned */ | |
411 | size = ((sizeof(*sch) + QDISC_ALIGN_CONST) & ~QDISC_ALIGN_CONST); | |
412 | size += ops->priv_size + QDISC_ALIGN_CONST; | |
413 | ||
414 | p = kmalloc(size, GFP_KERNEL); | |
415 | if (!p) | |
416 | return NULL; | |
417 | memset(p, 0, size); | |
418 | ||
419 | sch = (struct Qdisc *)(((unsigned long)p + QDISC_ALIGN_CONST) | |
420 | & ~QDISC_ALIGN_CONST); | |
421 | sch->padded = (char *)sch - (char *)p; | |
422 | ||
423 | INIT_LIST_HEAD(&sch->list); | |
424 | skb_queue_head_init(&sch->q); | |
425 | sch->ops = ops; | |
426 | sch->enqueue = ops->enqueue; | |
427 | sch->dequeue = ops->dequeue; | |
428 | sch->dev = dev; | |
429 | dev_hold(dev); | |
430 | sch->stats_lock = &dev->queue_lock; | |
431 | atomic_set(&sch->refcnt, 1); | |
432 | if (!ops->init || ops->init(sch, NULL) == 0) | |
433 | return sch; | |
434 | ||
435 | dev_put(dev); | |
436 | kfree(p); | |
437 | return NULL; | |
438 | } | |
439 | ||
440 | /* Under dev->queue_lock and BH! */ | |
441 | ||
442 | void qdisc_reset(struct Qdisc *qdisc) | |
443 | { | |
444 | struct Qdisc_ops *ops = qdisc->ops; | |
445 | ||
446 | if (ops->reset) | |
447 | ops->reset(qdisc); | |
448 | } | |
449 | ||
450 | /* this is the rcu callback function to clean up a qdisc when there | |
451 | * are no further references to it */ | |
452 | ||
453 | static void __qdisc_destroy(struct rcu_head *head) | |
454 | { | |
455 | struct Qdisc *qdisc = container_of(head, struct Qdisc, q_rcu); | |
456 | struct Qdisc_ops *ops = qdisc->ops; | |
457 | ||
458 | #ifdef CONFIG_NET_ESTIMATOR | |
459 | gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est); | |
460 | #endif | |
461 | write_lock(&qdisc_tree_lock); | |
462 | if (ops->reset) | |
463 | ops->reset(qdisc); | |
464 | if (ops->destroy) | |
465 | ops->destroy(qdisc); | |
466 | write_unlock(&qdisc_tree_lock); | |
467 | module_put(ops->owner); | |
468 | ||
469 | dev_put(qdisc->dev); | |
470 | kfree((char *) qdisc - qdisc->padded); | |
471 | } | |
472 | ||
473 | /* Under dev->queue_lock and BH! */ | |
474 | ||
475 | void qdisc_destroy(struct Qdisc *qdisc) | |
476 | { | |
477 | struct list_head cql = LIST_HEAD_INIT(cql); | |
478 | struct Qdisc *cq, *q, *n; | |
479 | ||
480 | if (qdisc->flags & TCQ_F_BUILTIN || | |
481 | !atomic_dec_and_test(&qdisc->refcnt)) | |
482 | return; | |
483 | ||
484 | if (!list_empty(&qdisc->list)) { | |
485 | if (qdisc->ops->cl_ops == NULL) | |
486 | list_del(&qdisc->list); | |
487 | else | |
488 | list_move(&qdisc->list, &cql); | |
489 | } | |
490 | ||
491 | /* unlink inner qdiscs from dev->qdisc_list immediately */ | |
492 | list_for_each_entry(cq, &cql, list) | |
493 | list_for_each_entry_safe(q, n, &qdisc->dev->qdisc_list, list) | |
494 | if (TC_H_MAJ(q->parent) == TC_H_MAJ(cq->handle)) { | |
495 | if (q->ops->cl_ops == NULL) | |
496 | list_del_init(&q->list); | |
497 | else | |
498 | list_move_tail(&q->list, &cql); | |
499 | } | |
500 | list_for_each_entry_safe(cq, n, &cql, list) | |
501 | list_del_init(&cq->list); | |
502 | ||
503 | call_rcu(&qdisc->q_rcu, __qdisc_destroy); | |
504 | } | |
505 | ||
506 | void dev_activate(struct net_device *dev) | |
507 | { | |
508 | /* No queueing discipline is attached to device; | |
509 | create default one i.e. pfifo_fast for devices, | |
510 | which need queueing and noqueue_qdisc for | |
511 | virtual interfaces | |
512 | */ | |
513 | ||
514 | if (dev->qdisc_sleeping == &noop_qdisc) { | |
515 | struct Qdisc *qdisc; | |
516 | if (dev->tx_queue_len) { | |
517 | qdisc = qdisc_create_dflt(dev, &pfifo_fast_ops); | |
518 | if (qdisc == NULL) { | |
519 | printk(KERN_INFO "%s: activation failed\n", dev->name); | |
520 | return; | |
521 | } | |
522 | write_lock_bh(&qdisc_tree_lock); | |
523 | list_add_tail(&qdisc->list, &dev->qdisc_list); | |
524 | write_unlock_bh(&qdisc_tree_lock); | |
525 | } else { | |
526 | qdisc = &noqueue_qdisc; | |
527 | } | |
528 | write_lock_bh(&qdisc_tree_lock); | |
529 | dev->qdisc_sleeping = qdisc; | |
530 | write_unlock_bh(&qdisc_tree_lock); | |
531 | } | |
532 | ||
cacaddf5 TC |
533 | if (!netif_carrier_ok(dev)) |
534 | /* Delay activation until next carrier-on event */ | |
535 | return; | |
536 | ||
1da177e4 LT |
537 | spin_lock_bh(&dev->queue_lock); |
538 | rcu_assign_pointer(dev->qdisc, dev->qdisc_sleeping); | |
539 | if (dev->qdisc != &noqueue_qdisc) { | |
540 | dev->trans_start = jiffies; | |
541 | dev_watchdog_up(dev); | |
542 | } | |
543 | spin_unlock_bh(&dev->queue_lock); | |
544 | } | |
545 | ||
546 | void dev_deactivate(struct net_device *dev) | |
547 | { | |
548 | struct Qdisc *qdisc; | |
549 | ||
550 | spin_lock_bh(&dev->queue_lock); | |
551 | qdisc = dev->qdisc; | |
552 | dev->qdisc = &noop_qdisc; | |
553 | ||
554 | qdisc_reset(qdisc); | |
555 | ||
556 | spin_unlock_bh(&dev->queue_lock); | |
557 | ||
558 | dev_watchdog_down(dev); | |
559 | ||
560 | while (test_bit(__LINK_STATE_SCHED, &dev->state)) | |
561 | yield(); | |
562 | ||
563 | spin_unlock_wait(&dev->xmit_lock); | |
564 | } | |
565 | ||
566 | void dev_init_scheduler(struct net_device *dev) | |
567 | { | |
568 | qdisc_lock_tree(dev); | |
569 | dev->qdisc = &noop_qdisc; | |
570 | dev->qdisc_sleeping = &noop_qdisc; | |
571 | INIT_LIST_HEAD(&dev->qdisc_list); | |
572 | qdisc_unlock_tree(dev); | |
573 | ||
574 | dev_watchdog_init(dev); | |
575 | } | |
576 | ||
577 | void dev_shutdown(struct net_device *dev) | |
578 | { | |
579 | struct Qdisc *qdisc; | |
580 | ||
581 | qdisc_lock_tree(dev); | |
582 | qdisc = dev->qdisc_sleeping; | |
583 | dev->qdisc = &noop_qdisc; | |
584 | dev->qdisc_sleeping = &noop_qdisc; | |
585 | qdisc_destroy(qdisc); | |
586 | #if defined(CONFIG_NET_SCH_INGRESS) || defined(CONFIG_NET_SCH_INGRESS_MODULE) | |
587 | if ((qdisc = dev->qdisc_ingress) != NULL) { | |
588 | dev->qdisc_ingress = NULL; | |
589 | qdisc_destroy(qdisc); | |
590 | } | |
591 | #endif | |
592 | BUG_TRAP(!timer_pending(&dev->watchdog_timer)); | |
593 | qdisc_unlock_tree(dev); | |
594 | } | |
595 | ||
596 | EXPORT_SYMBOL(__netdev_watchdog_up); | |
597 | EXPORT_SYMBOL(noop_qdisc); | |
598 | EXPORT_SYMBOL(noop_qdisc_ops); | |
599 | EXPORT_SYMBOL(qdisc_create_dflt); | |
600 | EXPORT_SYMBOL(qdisc_destroy); | |
601 | EXPORT_SYMBOL(qdisc_reset); | |
602 | EXPORT_SYMBOL(qdisc_restart); | |
603 | EXPORT_SYMBOL(qdisc_lock_tree); | |
604 | EXPORT_SYMBOL(qdisc_unlock_tree); |