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Commit | Line | Data |
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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 | ||
932ff279 | 75 | netif_tx_lock serializes accesses to device driver. |
1da177e4 | 76 | |
932ff279 | 77 | dev->queue_lock and netif_tx_lock are mutually exclusive, |
1da177e4 LT |
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) { | |
932ff279 | 111 | if (!netif_tx_trylock(dev)) { |
1da177e4 LT |
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 | } | |
1da177e4 LT |
129 | } |
130 | ||
131 | { | |
132 | /* And release queue */ | |
133 | spin_unlock(&dev->queue_lock); | |
134 | ||
135 | if (!netif_queue_stopped(dev)) { | |
136 | int ret; | |
137 | if (netdev_nit) | |
138 | dev_queue_xmit_nit(skb, dev); | |
139 | ||
140 | ret = dev->hard_start_xmit(skb, dev); | |
141 | if (ret == NETDEV_TX_OK) { | |
142 | if (!nolock) { | |
932ff279 | 143 | netif_tx_unlock(dev); |
1da177e4 LT |
144 | } |
145 | spin_lock(&dev->queue_lock); | |
146 | return -1; | |
147 | } | |
148 | if (ret == NETDEV_TX_LOCKED && nolock) { | |
149 | spin_lock(&dev->queue_lock); | |
150 | goto collision; | |
151 | } | |
152 | } | |
153 | ||
154 | /* NETDEV_TX_BUSY - we need to requeue */ | |
155 | /* Release the driver */ | |
156 | if (!nolock) { | |
932ff279 | 157 | netif_tx_unlock(dev); |
1da177e4 LT |
158 | } |
159 | spin_lock(&dev->queue_lock); | |
160 | q = dev->qdisc; | |
161 | } | |
162 | ||
163 | /* Device kicked us out :( | |
164 | This is possible in three cases: | |
165 | ||
166 | 0. driver is locked | |
167 | 1. fastroute is enabled | |
168 | 2. device cannot determine busy state | |
169 | before start of transmission (f.e. dialout) | |
170 | 3. device is buggy (ppp) | |
171 | */ | |
172 | ||
173 | requeue: | |
174 | q->ops->requeue(skb, q); | |
175 | netif_schedule(dev); | |
176 | return 1; | |
177 | } | |
8cbe1d46 | 178 | BUG_ON((int) q->q.qlen < 0); |
1da177e4 LT |
179 | return q->q.qlen; |
180 | } | |
181 | ||
182 | static void dev_watchdog(unsigned long arg) | |
183 | { | |
184 | struct net_device *dev = (struct net_device *)arg; | |
185 | ||
932ff279 | 186 | netif_tx_lock(dev); |
1da177e4 LT |
187 | if (dev->qdisc != &noop_qdisc) { |
188 | if (netif_device_present(dev) && | |
189 | netif_running(dev) && | |
190 | netif_carrier_ok(dev)) { | |
191 | if (netif_queue_stopped(dev) && | |
338f7566 SH |
192 | time_after(jiffies, dev->trans_start + dev->watchdog_timeo)) { |
193 | ||
194 | printk(KERN_INFO "NETDEV WATCHDOG: %s: transmit timed out\n", | |
195 | dev->name); | |
1da177e4 LT |
196 | dev->tx_timeout(dev); |
197 | } | |
198 | if (!mod_timer(&dev->watchdog_timer, jiffies + dev->watchdog_timeo)) | |
199 | dev_hold(dev); | |
200 | } | |
201 | } | |
932ff279 | 202 | netif_tx_unlock(dev); |
1da177e4 LT |
203 | |
204 | dev_put(dev); | |
205 | } | |
206 | ||
207 | static void dev_watchdog_init(struct net_device *dev) | |
208 | { | |
209 | init_timer(&dev->watchdog_timer); | |
210 | dev->watchdog_timer.data = (unsigned long)dev; | |
211 | dev->watchdog_timer.function = dev_watchdog; | |
212 | } | |
213 | ||
214 | void __netdev_watchdog_up(struct net_device *dev) | |
215 | { | |
216 | if (dev->tx_timeout) { | |
217 | if (dev->watchdog_timeo <= 0) | |
218 | dev->watchdog_timeo = 5*HZ; | |
219 | if (!mod_timer(&dev->watchdog_timer, jiffies + dev->watchdog_timeo)) | |
220 | dev_hold(dev); | |
221 | } | |
222 | } | |
223 | ||
224 | static void dev_watchdog_up(struct net_device *dev) | |
225 | { | |
932ff279 | 226 | netif_tx_lock_bh(dev); |
1da177e4 | 227 | __netdev_watchdog_up(dev); |
932ff279 | 228 | netif_tx_unlock_bh(dev); |
1da177e4 LT |
229 | } |
230 | ||
231 | static void dev_watchdog_down(struct net_device *dev) | |
232 | { | |
932ff279 | 233 | netif_tx_lock_bh(dev); |
1da177e4 | 234 | if (del_timer(&dev->watchdog_timer)) |
15333061 | 235 | dev_put(dev); |
932ff279 | 236 | netif_tx_unlock_bh(dev); |
1da177e4 LT |
237 | } |
238 | ||
0a242efc DV |
239 | void netif_carrier_on(struct net_device *dev) |
240 | { | |
241 | if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) | |
242 | linkwatch_fire_event(dev); | |
243 | if (netif_running(dev)) | |
244 | __netdev_watchdog_up(dev); | |
245 | } | |
246 | ||
247 | void netif_carrier_off(struct net_device *dev) | |
248 | { | |
249 | if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) | |
250 | linkwatch_fire_event(dev); | |
251 | } | |
252 | ||
1da177e4 LT |
253 | /* "NOOP" scheduler: the best scheduler, recommended for all interfaces |
254 | under all circumstances. It is difficult to invent anything faster or | |
255 | cheaper. | |
256 | */ | |
257 | ||
94df109a | 258 | static int noop_enqueue(struct sk_buff *skb, struct Qdisc * qdisc) |
1da177e4 LT |
259 | { |
260 | kfree_skb(skb); | |
261 | return NET_XMIT_CN; | |
262 | } | |
263 | ||
94df109a | 264 | static struct sk_buff *noop_dequeue(struct Qdisc * qdisc) |
1da177e4 LT |
265 | { |
266 | return NULL; | |
267 | } | |
268 | ||
94df109a | 269 | static int noop_requeue(struct sk_buff *skb, struct Qdisc* qdisc) |
1da177e4 LT |
270 | { |
271 | if (net_ratelimit()) | |
94df109a TG |
272 | printk(KERN_DEBUG "%s deferred output. It is buggy.\n", |
273 | skb->dev->name); | |
1da177e4 LT |
274 | kfree_skb(skb); |
275 | return NET_XMIT_CN; | |
276 | } | |
277 | ||
278 | struct Qdisc_ops noop_qdisc_ops = { | |
1da177e4 LT |
279 | .id = "noop", |
280 | .priv_size = 0, | |
281 | .enqueue = noop_enqueue, | |
282 | .dequeue = noop_dequeue, | |
283 | .requeue = noop_requeue, | |
284 | .owner = THIS_MODULE, | |
285 | }; | |
286 | ||
287 | struct Qdisc noop_qdisc = { | |
288 | .enqueue = noop_enqueue, | |
289 | .dequeue = noop_dequeue, | |
290 | .flags = TCQ_F_BUILTIN, | |
291 | .ops = &noop_qdisc_ops, | |
292 | .list = LIST_HEAD_INIT(noop_qdisc.list), | |
293 | }; | |
294 | ||
295 | static struct Qdisc_ops noqueue_qdisc_ops = { | |
1da177e4 LT |
296 | .id = "noqueue", |
297 | .priv_size = 0, | |
298 | .enqueue = noop_enqueue, | |
299 | .dequeue = noop_dequeue, | |
300 | .requeue = noop_requeue, | |
301 | .owner = THIS_MODULE, | |
302 | }; | |
303 | ||
304 | static struct Qdisc noqueue_qdisc = { | |
305 | .enqueue = NULL, | |
306 | .dequeue = noop_dequeue, | |
307 | .flags = TCQ_F_BUILTIN, | |
308 | .ops = &noqueue_qdisc_ops, | |
309 | .list = LIST_HEAD_INIT(noqueue_qdisc.list), | |
310 | }; | |
311 | ||
312 | ||
313 | static const u8 prio2band[TC_PRIO_MAX+1] = | |
314 | { 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 }; | |
315 | ||
316 | /* 3-band FIFO queue: old style, but should be a bit faster than | |
317 | generic prio+fifo combination. | |
318 | */ | |
319 | ||
f87a9c3d TG |
320 | #define PFIFO_FAST_BANDS 3 |
321 | ||
321090e7 TG |
322 | static inline struct sk_buff_head *prio2list(struct sk_buff *skb, |
323 | struct Qdisc *qdisc) | |
1da177e4 LT |
324 | { |
325 | struct sk_buff_head *list = qdisc_priv(qdisc); | |
321090e7 TG |
326 | return list + prio2band[skb->priority & TC_PRIO_MAX]; |
327 | } | |
1da177e4 | 328 | |
f87a9c3d | 329 | static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc* qdisc) |
321090e7 TG |
330 | { |
331 | struct sk_buff_head *list = prio2list(skb, qdisc); | |
1da177e4 | 332 | |
821d24ae | 333 | if (skb_queue_len(list) < qdisc->dev->tx_queue_len) { |
1da177e4 | 334 | qdisc->q.qlen++; |
821d24ae | 335 | return __qdisc_enqueue_tail(skb, qdisc, list); |
1da177e4 | 336 | } |
821d24ae TG |
337 | |
338 | return qdisc_drop(skb, qdisc); | |
1da177e4 LT |
339 | } |
340 | ||
f87a9c3d | 341 | static struct sk_buff *pfifo_fast_dequeue(struct Qdisc* qdisc) |
1da177e4 LT |
342 | { |
343 | int prio; | |
344 | struct sk_buff_head *list = qdisc_priv(qdisc); | |
1da177e4 | 345 | |
452f299d TG |
346 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) { |
347 | if (!skb_queue_empty(list + prio)) { | |
1da177e4 | 348 | qdisc->q.qlen--; |
452f299d | 349 | return __qdisc_dequeue_head(qdisc, list + prio); |
1da177e4 LT |
350 | } |
351 | } | |
f87a9c3d | 352 | |
1da177e4 LT |
353 | return NULL; |
354 | } | |
355 | ||
f87a9c3d | 356 | static int pfifo_fast_requeue(struct sk_buff *skb, struct Qdisc* qdisc) |
1da177e4 | 357 | { |
1da177e4 | 358 | qdisc->q.qlen++; |
321090e7 | 359 | return __qdisc_requeue(skb, qdisc, prio2list(skb, qdisc)); |
1da177e4 LT |
360 | } |
361 | ||
f87a9c3d | 362 | static void pfifo_fast_reset(struct Qdisc* qdisc) |
1da177e4 LT |
363 | { |
364 | int prio; | |
365 | struct sk_buff_head *list = qdisc_priv(qdisc); | |
366 | ||
f87a9c3d | 367 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
821d24ae TG |
368 | __qdisc_reset_queue(qdisc, list + prio); |
369 | ||
370 | qdisc->qstats.backlog = 0; | |
1da177e4 LT |
371 | qdisc->q.qlen = 0; |
372 | } | |
373 | ||
374 | static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) | |
375 | { | |
f87a9c3d | 376 | struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; |
1da177e4 | 377 | |
1da177e4 LT |
378 | memcpy(&opt.priomap, prio2band, TC_PRIO_MAX+1); |
379 | RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt); | |
380 | return skb->len; | |
381 | ||
382 | rtattr_failure: | |
1da177e4 LT |
383 | return -1; |
384 | } | |
385 | ||
386 | static int pfifo_fast_init(struct Qdisc *qdisc, struct rtattr *opt) | |
387 | { | |
f87a9c3d | 388 | int prio; |
1da177e4 LT |
389 | struct sk_buff_head *list = qdisc_priv(qdisc); |
390 | ||
f87a9c3d TG |
391 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
392 | skb_queue_head_init(list + prio); | |
1da177e4 LT |
393 | |
394 | return 0; | |
395 | } | |
396 | ||
397 | static struct Qdisc_ops pfifo_fast_ops = { | |
1da177e4 | 398 | .id = "pfifo_fast", |
f87a9c3d | 399 | .priv_size = PFIFO_FAST_BANDS * sizeof(struct sk_buff_head), |
1da177e4 LT |
400 | .enqueue = pfifo_fast_enqueue, |
401 | .dequeue = pfifo_fast_dequeue, | |
402 | .requeue = pfifo_fast_requeue, | |
403 | .init = pfifo_fast_init, | |
404 | .reset = pfifo_fast_reset, | |
405 | .dump = pfifo_fast_dump, | |
406 | .owner = THIS_MODULE, | |
407 | }; | |
408 | ||
3d54b82f | 409 | struct Qdisc *qdisc_alloc(struct net_device *dev, struct Qdisc_ops *ops) |
1da177e4 LT |
410 | { |
411 | void *p; | |
412 | struct Qdisc *sch; | |
3d54b82f TG |
413 | unsigned int size; |
414 | int err = -ENOBUFS; | |
1da177e4 LT |
415 | |
416 | /* ensure that the Qdisc and the private data are 32-byte aligned */ | |
3d54b82f TG |
417 | size = QDISC_ALIGN(sizeof(*sch)); |
418 | size += ops->priv_size + (QDISC_ALIGNTO - 1); | |
1da177e4 LT |
419 | |
420 | p = kmalloc(size, GFP_KERNEL); | |
421 | if (!p) | |
3d54b82f | 422 | goto errout; |
1da177e4 | 423 | memset(p, 0, size); |
3d54b82f TG |
424 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); |
425 | sch->padded = (char *) sch - (char *) p; | |
1da177e4 LT |
426 | |
427 | INIT_LIST_HEAD(&sch->list); | |
428 | skb_queue_head_init(&sch->q); | |
429 | sch->ops = ops; | |
430 | sch->enqueue = ops->enqueue; | |
431 | sch->dequeue = ops->dequeue; | |
432 | sch->dev = dev; | |
433 | dev_hold(dev); | |
434 | sch->stats_lock = &dev->queue_lock; | |
435 | atomic_set(&sch->refcnt, 1); | |
3d54b82f TG |
436 | |
437 | return sch; | |
438 | errout: | |
439 | return ERR_PTR(-err); | |
440 | } | |
441 | ||
442 | struct Qdisc * qdisc_create_dflt(struct net_device *dev, struct Qdisc_ops *ops) | |
443 | { | |
444 | struct Qdisc *sch; | |
445 | ||
446 | sch = qdisc_alloc(dev, ops); | |
447 | if (IS_ERR(sch)) | |
448 | goto errout; | |
449 | ||
1da177e4 LT |
450 | if (!ops->init || ops->init(sch, NULL) == 0) |
451 | return sch; | |
452 | ||
0fbbeb1b | 453 | qdisc_destroy(sch); |
3d54b82f | 454 | errout: |
1da177e4 LT |
455 | return NULL; |
456 | } | |
457 | ||
458 | /* Under dev->queue_lock and BH! */ | |
459 | ||
460 | void qdisc_reset(struct Qdisc *qdisc) | |
461 | { | |
462 | struct Qdisc_ops *ops = qdisc->ops; | |
463 | ||
464 | if (ops->reset) | |
465 | ops->reset(qdisc); | |
466 | } | |
467 | ||
468 | /* this is the rcu callback function to clean up a qdisc when there | |
469 | * are no further references to it */ | |
470 | ||
471 | static void __qdisc_destroy(struct rcu_head *head) | |
472 | { | |
473 | struct Qdisc *qdisc = container_of(head, struct Qdisc, q_rcu); | |
474 | struct Qdisc_ops *ops = qdisc->ops; | |
475 | ||
476 | #ifdef CONFIG_NET_ESTIMATOR | |
477 | gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est); | |
478 | #endif | |
479 | write_lock(&qdisc_tree_lock); | |
480 | if (ops->reset) | |
481 | ops->reset(qdisc); | |
482 | if (ops->destroy) | |
483 | ops->destroy(qdisc); | |
484 | write_unlock(&qdisc_tree_lock); | |
485 | module_put(ops->owner); | |
486 | ||
487 | dev_put(qdisc->dev); | |
488 | kfree((char *) qdisc - qdisc->padded); | |
489 | } | |
490 | ||
491 | /* Under dev->queue_lock and BH! */ | |
492 | ||
493 | void qdisc_destroy(struct Qdisc *qdisc) | |
494 | { | |
495 | struct list_head cql = LIST_HEAD_INIT(cql); | |
496 | struct Qdisc *cq, *q, *n; | |
497 | ||
498 | if (qdisc->flags & TCQ_F_BUILTIN || | |
499 | !atomic_dec_and_test(&qdisc->refcnt)) | |
500 | return; | |
501 | ||
502 | if (!list_empty(&qdisc->list)) { | |
503 | if (qdisc->ops->cl_ops == NULL) | |
504 | list_del(&qdisc->list); | |
505 | else | |
506 | list_move(&qdisc->list, &cql); | |
507 | } | |
508 | ||
509 | /* unlink inner qdiscs from dev->qdisc_list immediately */ | |
510 | list_for_each_entry(cq, &cql, list) | |
511 | list_for_each_entry_safe(q, n, &qdisc->dev->qdisc_list, list) | |
512 | if (TC_H_MAJ(q->parent) == TC_H_MAJ(cq->handle)) { | |
513 | if (q->ops->cl_ops == NULL) | |
514 | list_del_init(&q->list); | |
515 | else | |
516 | list_move_tail(&q->list, &cql); | |
517 | } | |
518 | list_for_each_entry_safe(cq, n, &cql, list) | |
519 | list_del_init(&cq->list); | |
520 | ||
521 | call_rcu(&qdisc->q_rcu, __qdisc_destroy); | |
522 | } | |
523 | ||
524 | void dev_activate(struct net_device *dev) | |
525 | { | |
526 | /* No queueing discipline is attached to device; | |
527 | create default one i.e. pfifo_fast for devices, | |
528 | which need queueing and noqueue_qdisc for | |
529 | virtual interfaces | |
530 | */ | |
531 | ||
532 | if (dev->qdisc_sleeping == &noop_qdisc) { | |
533 | struct Qdisc *qdisc; | |
534 | if (dev->tx_queue_len) { | |
535 | qdisc = qdisc_create_dflt(dev, &pfifo_fast_ops); | |
536 | if (qdisc == NULL) { | |
537 | printk(KERN_INFO "%s: activation failed\n", dev->name); | |
538 | return; | |
539 | } | |
540 | write_lock_bh(&qdisc_tree_lock); | |
541 | list_add_tail(&qdisc->list, &dev->qdisc_list); | |
542 | write_unlock_bh(&qdisc_tree_lock); | |
543 | } else { | |
544 | qdisc = &noqueue_qdisc; | |
545 | } | |
546 | write_lock_bh(&qdisc_tree_lock); | |
547 | dev->qdisc_sleeping = qdisc; | |
548 | write_unlock_bh(&qdisc_tree_lock); | |
549 | } | |
550 | ||
cacaddf5 TC |
551 | if (!netif_carrier_ok(dev)) |
552 | /* Delay activation until next carrier-on event */ | |
553 | return; | |
554 | ||
1da177e4 LT |
555 | spin_lock_bh(&dev->queue_lock); |
556 | rcu_assign_pointer(dev->qdisc, dev->qdisc_sleeping); | |
557 | if (dev->qdisc != &noqueue_qdisc) { | |
558 | dev->trans_start = jiffies; | |
559 | dev_watchdog_up(dev); | |
560 | } | |
561 | spin_unlock_bh(&dev->queue_lock); | |
562 | } | |
563 | ||
564 | void dev_deactivate(struct net_device *dev) | |
565 | { | |
566 | struct Qdisc *qdisc; | |
567 | ||
568 | spin_lock_bh(&dev->queue_lock); | |
569 | qdisc = dev->qdisc; | |
570 | dev->qdisc = &noop_qdisc; | |
571 | ||
572 | qdisc_reset(qdisc); | |
573 | ||
574 | spin_unlock_bh(&dev->queue_lock); | |
575 | ||
576 | dev_watchdog_down(dev); | |
577 | ||
578 | while (test_bit(__LINK_STATE_SCHED, &dev->state)) | |
579 | yield(); | |
580 | ||
932ff279 | 581 | spin_unlock_wait(&dev->_xmit_lock); |
1da177e4 LT |
582 | } |
583 | ||
584 | void dev_init_scheduler(struct net_device *dev) | |
585 | { | |
586 | qdisc_lock_tree(dev); | |
587 | dev->qdisc = &noop_qdisc; | |
588 | dev->qdisc_sleeping = &noop_qdisc; | |
589 | INIT_LIST_HEAD(&dev->qdisc_list); | |
590 | qdisc_unlock_tree(dev); | |
591 | ||
592 | dev_watchdog_init(dev); | |
593 | } | |
594 | ||
595 | void dev_shutdown(struct net_device *dev) | |
596 | { | |
597 | struct Qdisc *qdisc; | |
598 | ||
599 | qdisc_lock_tree(dev); | |
600 | qdisc = dev->qdisc_sleeping; | |
601 | dev->qdisc = &noop_qdisc; | |
602 | dev->qdisc_sleeping = &noop_qdisc; | |
603 | qdisc_destroy(qdisc); | |
604 | #if defined(CONFIG_NET_SCH_INGRESS) || defined(CONFIG_NET_SCH_INGRESS_MODULE) | |
605 | if ((qdisc = dev->qdisc_ingress) != NULL) { | |
606 | dev->qdisc_ingress = NULL; | |
607 | qdisc_destroy(qdisc); | |
608 | } | |
609 | #endif | |
610 | BUG_TRAP(!timer_pending(&dev->watchdog_timer)); | |
611 | qdisc_unlock_tree(dev); | |
612 | } | |
613 | ||
614 | EXPORT_SYMBOL(__netdev_watchdog_up); | |
0a242efc DV |
615 | EXPORT_SYMBOL(netif_carrier_on); |
616 | EXPORT_SYMBOL(netif_carrier_off); | |
1da177e4 LT |
617 | EXPORT_SYMBOL(noop_qdisc); |
618 | EXPORT_SYMBOL(noop_qdisc_ops); | |
619 | EXPORT_SYMBOL(qdisc_create_dflt); | |
3d54b82f | 620 | EXPORT_SYMBOL(qdisc_alloc); |
1da177e4 LT |
621 | EXPORT_SYMBOL(qdisc_destroy); |
622 | EXPORT_SYMBOL(qdisc_reset); | |
623 | EXPORT_SYMBOL(qdisc_restart); | |
624 | EXPORT_SYMBOL(qdisc_lock_tree); | |
625 | EXPORT_SYMBOL(qdisc_unlock_tree); |