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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> | |
1da177e4 LT |
17 | #include <linux/module.h> |
18 | #include <linux/types.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/socket.h> | |
24 | #include <linux/sockios.h> | |
25 | #include <linux/in.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/skbuff.h> | |
30 | #include <linux/rtnetlink.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/rcupdate.h> | |
33 | #include <linux/list.h> | |
34 | #include <net/sock.h> | |
35 | #include <net/pkt_sched.h> | |
36 | ||
37 | /* Main transmission queue. */ | |
38 | ||
0463d4ae PM |
39 | /* Modifications to data participating in scheduling must be protected with |
40 | * dev->queue_lock spinlock. | |
41 | * | |
42 | * The idea is the following: | |
43 | * - enqueue, dequeue are serialized via top level device | |
44 | * spinlock dev->queue_lock. | |
fd44de7c PM |
45 | * - ingress filtering is serialized via top level device |
46 | * spinlock dev->ingress_lock. | |
0463d4ae | 47 | * - updates to tree and tree walking are only done under the rtnl mutex. |
1da177e4 | 48 | */ |
1da177e4 LT |
49 | |
50 | void qdisc_lock_tree(struct net_device *dev) | |
51 | { | |
1da177e4 | 52 | spin_lock_bh(&dev->queue_lock); |
fd44de7c | 53 | spin_lock(&dev->ingress_lock); |
1da177e4 LT |
54 | } |
55 | ||
56 | void qdisc_unlock_tree(struct net_device *dev) | |
57 | { | |
fd44de7c | 58 | spin_unlock(&dev->ingress_lock); |
1da177e4 | 59 | spin_unlock_bh(&dev->queue_lock); |
1da177e4 LT |
60 | } |
61 | ||
10297b99 | 62 | /* |
1da177e4 LT |
63 | dev->queue_lock serializes queue accesses for this device |
64 | AND dev->qdisc pointer itself. | |
65 | ||
932ff279 | 66 | netif_tx_lock serializes accesses to device driver. |
1da177e4 | 67 | |
932ff279 | 68 | dev->queue_lock and netif_tx_lock are mutually exclusive, |
1da177e4 LT |
69 | if one is grabbed, another must be free. |
70 | */ | |
71 | ||
72 | ||
73 | /* Kick device. | |
1da177e4 | 74 | |
d90df3ad HX |
75 | Returns: 0 - queue is empty or throttled. |
76 | >0 - queue is not empty. | |
1da177e4 LT |
77 | |
78 | NOTE: Called under dev->queue_lock with locally disabled BH. | |
79 | */ | |
80 | ||
48d83325 | 81 | static inline int qdisc_restart(struct net_device *dev) |
1da177e4 LT |
82 | { |
83 | struct Qdisc *q = dev->qdisc; | |
84 | struct sk_buff *skb; | |
85 | ||
86 | /* Dequeue packet */ | |
f6a78bfc | 87 | if (((skb = dev->gso_skb)) || ((skb = q->dequeue(q)))) { |
1da177e4 | 88 | unsigned nolock = (dev->features & NETIF_F_LLTX); |
f6a78bfc HX |
89 | |
90 | dev->gso_skb = NULL; | |
91 | ||
1da177e4 LT |
92 | /* |
93 | * When the driver has LLTX set it does its own locking | |
94 | * in start_xmit. No need to add additional overhead by | |
95 | * locking again. These checks are worth it because | |
96 | * even uncongested locks can be quite expensive. | |
97 | * The driver can do trylock like here too, in case | |
98 | * of lock congestion it should return -1 and the packet | |
99 | * will be requeued. | |
100 | */ | |
101 | if (!nolock) { | |
932ff279 | 102 | if (!netif_tx_trylock(dev)) { |
1da177e4 LT |
103 | collision: |
104 | /* So, someone grabbed the driver. */ | |
10297b99 | 105 | |
1da177e4 LT |
106 | /* It may be transient configuration error, |
107 | when hard_start_xmit() recurses. We detect | |
108 | it by checking xmit owner and drop the | |
109 | packet when deadloop is detected. | |
110 | */ | |
111 | if (dev->xmit_lock_owner == smp_processor_id()) { | |
112 | kfree_skb(skb); | |
113 | if (net_ratelimit()) | |
114 | printk(KERN_DEBUG "Dead loop on netdevice %s, fix it urgently!\n", dev->name); | |
d90df3ad | 115 | goto out; |
1da177e4 LT |
116 | } |
117 | __get_cpu_var(netdev_rx_stat).cpu_collision++; | |
118 | goto requeue; | |
119 | } | |
1da177e4 | 120 | } |
10297b99 | 121 | |
1da177e4 LT |
122 | { |
123 | /* And release queue */ | |
124 | spin_unlock(&dev->queue_lock); | |
125 | ||
126 | if (!netif_queue_stopped(dev)) { | |
127 | int ret; | |
1da177e4 | 128 | |
f6a78bfc | 129 | ret = dev_hard_start_xmit(skb, dev); |
10297b99 | 130 | if (ret == NETDEV_TX_OK) { |
1da177e4 | 131 | if (!nolock) { |
932ff279 | 132 | netif_tx_unlock(dev); |
1da177e4 LT |
133 | } |
134 | spin_lock(&dev->queue_lock); | |
cce1fa36 | 135 | q = dev->qdisc; |
d90df3ad | 136 | goto out; |
1da177e4 LT |
137 | } |
138 | if (ret == NETDEV_TX_LOCKED && nolock) { | |
139 | spin_lock(&dev->queue_lock); | |
5830725f | 140 | q = dev->qdisc; |
10297b99 | 141 | goto collision; |
1da177e4 LT |
142 | } |
143 | } | |
144 | ||
145 | /* NETDEV_TX_BUSY - we need to requeue */ | |
146 | /* Release the driver */ | |
10297b99 | 147 | if (!nolock) { |
932ff279 | 148 | netif_tx_unlock(dev); |
10297b99 | 149 | } |
1da177e4 LT |
150 | spin_lock(&dev->queue_lock); |
151 | q = dev->qdisc; | |
152 | } | |
153 | ||
154 | /* Device kicked us out :( | |
155 | This is possible in three cases: | |
156 | ||
157 | 0. driver is locked | |
158 | 1. fastroute is enabled | |
159 | 2. device cannot determine busy state | |
160 | before start of transmission (f.e. dialout) | |
161 | 3. device is buggy (ppp) | |
162 | */ | |
163 | ||
164 | requeue: | |
f6a78bfc HX |
165 | if (skb->next) |
166 | dev->gso_skb = skb; | |
167 | else | |
168 | q->ops->requeue(skb, q); | |
1da177e4 | 169 | netif_schedule(dev); |
d90df3ad | 170 | return 0; |
1da177e4 | 171 | } |
d90df3ad HX |
172 | |
173 | out: | |
8cbe1d46 | 174 | BUG_ON((int) q->q.qlen < 0); |
1da177e4 LT |
175 | return q->q.qlen; |
176 | } | |
177 | ||
48d83325 HX |
178 | void __qdisc_run(struct net_device *dev) |
179 | { | |
d4828d85 HX |
180 | if (unlikely(dev->qdisc == &noop_qdisc)) |
181 | goto out; | |
182 | ||
d90df3ad HX |
183 | do { |
184 | if (!qdisc_restart(dev)) | |
185 | break; | |
186 | } while (!netif_queue_stopped(dev)); | |
48d83325 | 187 | |
d4828d85 | 188 | out: |
48d83325 HX |
189 | clear_bit(__LINK_STATE_QDISC_RUNNING, &dev->state); |
190 | } | |
191 | ||
1da177e4 LT |
192 | static void dev_watchdog(unsigned long arg) |
193 | { | |
194 | struct net_device *dev = (struct net_device *)arg; | |
195 | ||
932ff279 | 196 | netif_tx_lock(dev); |
1da177e4 LT |
197 | if (dev->qdisc != &noop_qdisc) { |
198 | if (netif_device_present(dev) && | |
199 | netif_running(dev) && | |
200 | netif_carrier_ok(dev)) { | |
201 | if (netif_queue_stopped(dev) && | |
338f7566 SH |
202 | time_after(jiffies, dev->trans_start + dev->watchdog_timeo)) { |
203 | ||
204 | printk(KERN_INFO "NETDEV WATCHDOG: %s: transmit timed out\n", | |
205 | dev->name); | |
1da177e4 LT |
206 | dev->tx_timeout(dev); |
207 | } | |
f5a6e01c | 208 | if (!mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + dev->watchdog_timeo))) |
1da177e4 LT |
209 | dev_hold(dev); |
210 | } | |
211 | } | |
932ff279 | 212 | netif_tx_unlock(dev); |
1da177e4 LT |
213 | |
214 | dev_put(dev); | |
215 | } | |
216 | ||
217 | static void dev_watchdog_init(struct net_device *dev) | |
218 | { | |
219 | init_timer(&dev->watchdog_timer); | |
220 | dev->watchdog_timer.data = (unsigned long)dev; | |
221 | dev->watchdog_timer.function = dev_watchdog; | |
222 | } | |
223 | ||
224 | void __netdev_watchdog_up(struct net_device *dev) | |
225 | { | |
226 | if (dev->tx_timeout) { | |
227 | if (dev->watchdog_timeo <= 0) | |
228 | dev->watchdog_timeo = 5*HZ; | |
229 | if (!mod_timer(&dev->watchdog_timer, jiffies + dev->watchdog_timeo)) | |
230 | dev_hold(dev); | |
231 | } | |
232 | } | |
233 | ||
234 | static void dev_watchdog_up(struct net_device *dev) | |
235 | { | |
1da177e4 | 236 | __netdev_watchdog_up(dev); |
1da177e4 LT |
237 | } |
238 | ||
239 | static void dev_watchdog_down(struct net_device *dev) | |
240 | { | |
932ff279 | 241 | netif_tx_lock_bh(dev); |
1da177e4 | 242 | if (del_timer(&dev->watchdog_timer)) |
15333061 | 243 | dev_put(dev); |
932ff279 | 244 | netif_tx_unlock_bh(dev); |
1da177e4 LT |
245 | } |
246 | ||
0a242efc DV |
247 | void netif_carrier_on(struct net_device *dev) |
248 | { | |
249 | if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) | |
250 | linkwatch_fire_event(dev); | |
251 | if (netif_running(dev)) | |
252 | __netdev_watchdog_up(dev); | |
253 | } | |
254 | ||
255 | void netif_carrier_off(struct net_device *dev) | |
256 | { | |
257 | if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) | |
258 | linkwatch_fire_event(dev); | |
259 | } | |
260 | ||
1da177e4 LT |
261 | /* "NOOP" scheduler: the best scheduler, recommended for all interfaces |
262 | under all circumstances. It is difficult to invent anything faster or | |
263 | cheaper. | |
264 | */ | |
265 | ||
94df109a | 266 | static int noop_enqueue(struct sk_buff *skb, struct Qdisc * qdisc) |
1da177e4 LT |
267 | { |
268 | kfree_skb(skb); | |
269 | return NET_XMIT_CN; | |
270 | } | |
271 | ||
94df109a | 272 | static struct sk_buff *noop_dequeue(struct Qdisc * qdisc) |
1da177e4 LT |
273 | { |
274 | return NULL; | |
275 | } | |
276 | ||
94df109a | 277 | static int noop_requeue(struct sk_buff *skb, struct Qdisc* qdisc) |
1da177e4 LT |
278 | { |
279 | if (net_ratelimit()) | |
94df109a TG |
280 | printk(KERN_DEBUG "%s deferred output. It is buggy.\n", |
281 | skb->dev->name); | |
1da177e4 LT |
282 | kfree_skb(skb); |
283 | return NET_XMIT_CN; | |
284 | } | |
285 | ||
286 | struct Qdisc_ops noop_qdisc_ops = { | |
1da177e4 LT |
287 | .id = "noop", |
288 | .priv_size = 0, | |
289 | .enqueue = noop_enqueue, | |
290 | .dequeue = noop_dequeue, | |
291 | .requeue = noop_requeue, | |
292 | .owner = THIS_MODULE, | |
293 | }; | |
294 | ||
295 | struct Qdisc noop_qdisc = { | |
296 | .enqueue = noop_enqueue, | |
297 | .dequeue = noop_dequeue, | |
298 | .flags = TCQ_F_BUILTIN, | |
10297b99 | 299 | .ops = &noop_qdisc_ops, |
1da177e4 LT |
300 | .list = LIST_HEAD_INIT(noop_qdisc.list), |
301 | }; | |
302 | ||
303 | static struct Qdisc_ops noqueue_qdisc_ops = { | |
1da177e4 LT |
304 | .id = "noqueue", |
305 | .priv_size = 0, | |
306 | .enqueue = noop_enqueue, | |
307 | .dequeue = noop_dequeue, | |
308 | .requeue = noop_requeue, | |
309 | .owner = THIS_MODULE, | |
310 | }; | |
311 | ||
312 | static struct Qdisc noqueue_qdisc = { | |
313 | .enqueue = NULL, | |
314 | .dequeue = noop_dequeue, | |
315 | .flags = TCQ_F_BUILTIN, | |
316 | .ops = &noqueue_qdisc_ops, | |
317 | .list = LIST_HEAD_INIT(noqueue_qdisc.list), | |
318 | }; | |
319 | ||
320 | ||
321 | static const u8 prio2band[TC_PRIO_MAX+1] = | |
322 | { 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 }; | |
323 | ||
324 | /* 3-band FIFO queue: old style, but should be a bit faster than | |
325 | generic prio+fifo combination. | |
326 | */ | |
327 | ||
f87a9c3d TG |
328 | #define PFIFO_FAST_BANDS 3 |
329 | ||
321090e7 TG |
330 | static inline struct sk_buff_head *prio2list(struct sk_buff *skb, |
331 | struct Qdisc *qdisc) | |
1da177e4 LT |
332 | { |
333 | struct sk_buff_head *list = qdisc_priv(qdisc); | |
321090e7 TG |
334 | return list + prio2band[skb->priority & TC_PRIO_MAX]; |
335 | } | |
1da177e4 | 336 | |
f87a9c3d | 337 | static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc* qdisc) |
321090e7 TG |
338 | { |
339 | struct sk_buff_head *list = prio2list(skb, qdisc); | |
1da177e4 | 340 | |
821d24ae | 341 | if (skb_queue_len(list) < qdisc->dev->tx_queue_len) { |
1da177e4 | 342 | qdisc->q.qlen++; |
821d24ae | 343 | return __qdisc_enqueue_tail(skb, qdisc, list); |
1da177e4 | 344 | } |
821d24ae TG |
345 | |
346 | return qdisc_drop(skb, qdisc); | |
1da177e4 LT |
347 | } |
348 | ||
f87a9c3d | 349 | static struct sk_buff *pfifo_fast_dequeue(struct Qdisc* qdisc) |
1da177e4 LT |
350 | { |
351 | int prio; | |
352 | struct sk_buff_head *list = qdisc_priv(qdisc); | |
1da177e4 | 353 | |
452f299d TG |
354 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) { |
355 | if (!skb_queue_empty(list + prio)) { | |
1da177e4 | 356 | qdisc->q.qlen--; |
452f299d | 357 | return __qdisc_dequeue_head(qdisc, list + prio); |
1da177e4 LT |
358 | } |
359 | } | |
f87a9c3d | 360 | |
1da177e4 LT |
361 | return NULL; |
362 | } | |
363 | ||
f87a9c3d | 364 | static int pfifo_fast_requeue(struct sk_buff *skb, struct Qdisc* qdisc) |
1da177e4 | 365 | { |
1da177e4 | 366 | qdisc->q.qlen++; |
321090e7 | 367 | return __qdisc_requeue(skb, qdisc, prio2list(skb, qdisc)); |
1da177e4 LT |
368 | } |
369 | ||
f87a9c3d | 370 | static void pfifo_fast_reset(struct Qdisc* qdisc) |
1da177e4 LT |
371 | { |
372 | int prio; | |
373 | struct sk_buff_head *list = qdisc_priv(qdisc); | |
374 | ||
f87a9c3d | 375 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
821d24ae TG |
376 | __qdisc_reset_queue(qdisc, list + prio); |
377 | ||
378 | qdisc->qstats.backlog = 0; | |
1da177e4 LT |
379 | qdisc->q.qlen = 0; |
380 | } | |
381 | ||
382 | static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) | |
383 | { | |
f87a9c3d | 384 | struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; |
1da177e4 | 385 | |
1da177e4 LT |
386 | memcpy(&opt.priomap, prio2band, TC_PRIO_MAX+1); |
387 | RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt); | |
388 | return skb->len; | |
389 | ||
390 | rtattr_failure: | |
1da177e4 LT |
391 | return -1; |
392 | } | |
393 | ||
394 | static int pfifo_fast_init(struct Qdisc *qdisc, struct rtattr *opt) | |
395 | { | |
f87a9c3d | 396 | int prio; |
1da177e4 LT |
397 | struct sk_buff_head *list = qdisc_priv(qdisc); |
398 | ||
f87a9c3d TG |
399 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
400 | skb_queue_head_init(list + prio); | |
1da177e4 LT |
401 | |
402 | return 0; | |
403 | } | |
404 | ||
405 | static struct Qdisc_ops pfifo_fast_ops = { | |
1da177e4 | 406 | .id = "pfifo_fast", |
f87a9c3d | 407 | .priv_size = PFIFO_FAST_BANDS * sizeof(struct sk_buff_head), |
1da177e4 LT |
408 | .enqueue = pfifo_fast_enqueue, |
409 | .dequeue = pfifo_fast_dequeue, | |
410 | .requeue = pfifo_fast_requeue, | |
411 | .init = pfifo_fast_init, | |
412 | .reset = pfifo_fast_reset, | |
413 | .dump = pfifo_fast_dump, | |
414 | .owner = THIS_MODULE, | |
415 | }; | |
416 | ||
3d54b82f | 417 | struct Qdisc *qdisc_alloc(struct net_device *dev, struct Qdisc_ops *ops) |
1da177e4 LT |
418 | { |
419 | void *p; | |
420 | struct Qdisc *sch; | |
3d54b82f TG |
421 | unsigned int size; |
422 | int err = -ENOBUFS; | |
1da177e4 LT |
423 | |
424 | /* ensure that the Qdisc and the private data are 32-byte aligned */ | |
3d54b82f TG |
425 | size = QDISC_ALIGN(sizeof(*sch)); |
426 | size += ops->priv_size + (QDISC_ALIGNTO - 1); | |
1da177e4 | 427 | |
0da974f4 | 428 | p = kzalloc(size, GFP_KERNEL); |
1da177e4 | 429 | if (!p) |
3d54b82f | 430 | goto errout; |
3d54b82f TG |
431 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); |
432 | sch->padded = (char *) sch - (char *) p; | |
1da177e4 LT |
433 | |
434 | INIT_LIST_HEAD(&sch->list); | |
435 | skb_queue_head_init(&sch->q); | |
436 | sch->ops = ops; | |
437 | sch->enqueue = ops->enqueue; | |
438 | sch->dequeue = ops->dequeue; | |
439 | sch->dev = dev; | |
440 | dev_hold(dev); | |
1da177e4 | 441 | atomic_set(&sch->refcnt, 1); |
3d54b82f TG |
442 | |
443 | return sch; | |
444 | errout: | |
445 | return ERR_PTR(-err); | |
446 | } | |
447 | ||
9f9afec4 PM |
448 | struct Qdisc * qdisc_create_dflt(struct net_device *dev, struct Qdisc_ops *ops, |
449 | unsigned int parentid) | |
3d54b82f TG |
450 | { |
451 | struct Qdisc *sch; | |
10297b99 | 452 | |
3d54b82f TG |
453 | sch = qdisc_alloc(dev, ops); |
454 | if (IS_ERR(sch)) | |
455 | goto errout; | |
fd44de7c | 456 | sch->stats_lock = &dev->queue_lock; |
9f9afec4 | 457 | sch->parent = parentid; |
3d54b82f | 458 | |
1da177e4 LT |
459 | if (!ops->init || ops->init(sch, NULL) == 0) |
460 | return sch; | |
461 | ||
0fbbeb1b | 462 | qdisc_destroy(sch); |
3d54b82f | 463 | errout: |
1da177e4 LT |
464 | return NULL; |
465 | } | |
466 | ||
467 | /* Under dev->queue_lock and BH! */ | |
468 | ||
469 | void qdisc_reset(struct Qdisc *qdisc) | |
470 | { | |
471 | struct Qdisc_ops *ops = qdisc->ops; | |
472 | ||
473 | if (ops->reset) | |
474 | ops->reset(qdisc); | |
475 | } | |
476 | ||
10297b99 | 477 | /* this is the rcu callback function to clean up a qdisc when there |
1da177e4 LT |
478 | * are no further references to it */ |
479 | ||
480 | static void __qdisc_destroy(struct rcu_head *head) | |
481 | { | |
482 | struct Qdisc *qdisc = container_of(head, struct Qdisc, q_rcu); | |
1da177e4 LT |
483 | kfree((char *) qdisc - qdisc->padded); |
484 | } | |
485 | ||
486 | /* Under dev->queue_lock and BH! */ | |
487 | ||
488 | void qdisc_destroy(struct Qdisc *qdisc) | |
489 | { | |
85670cc1 | 490 | struct Qdisc_ops *ops = qdisc->ops; |
1da177e4 LT |
491 | |
492 | if (qdisc->flags & TCQ_F_BUILTIN || | |
85670cc1 | 493 | !atomic_dec_and_test(&qdisc->refcnt)) |
1da177e4 LT |
494 | return; |
495 | ||
85670cc1 PM |
496 | list_del(&qdisc->list); |
497 | #ifdef CONFIG_NET_ESTIMATOR | |
498 | gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est); | |
499 | #endif | |
500 | if (ops->reset) | |
501 | ops->reset(qdisc); | |
502 | if (ops->destroy) | |
503 | ops->destroy(qdisc); | |
1da177e4 | 504 | |
85670cc1 PM |
505 | module_put(ops->owner); |
506 | dev_put(qdisc->dev); | |
1da177e4 LT |
507 | call_rcu(&qdisc->q_rcu, __qdisc_destroy); |
508 | } | |
509 | ||
510 | void dev_activate(struct net_device *dev) | |
511 | { | |
512 | /* No queueing discipline is attached to device; | |
513 | create default one i.e. pfifo_fast for devices, | |
514 | which need queueing and noqueue_qdisc for | |
515 | virtual interfaces | |
516 | */ | |
517 | ||
518 | if (dev->qdisc_sleeping == &noop_qdisc) { | |
519 | struct Qdisc *qdisc; | |
520 | if (dev->tx_queue_len) { | |
9f9afec4 PM |
521 | qdisc = qdisc_create_dflt(dev, &pfifo_fast_ops, |
522 | TC_H_ROOT); | |
1da177e4 LT |
523 | if (qdisc == NULL) { |
524 | printk(KERN_INFO "%s: activation failed\n", dev->name); | |
525 | return; | |
526 | } | |
1da177e4 | 527 | list_add_tail(&qdisc->list, &dev->qdisc_list); |
1da177e4 LT |
528 | } else { |
529 | qdisc = &noqueue_qdisc; | |
530 | } | |
1da177e4 | 531 | dev->qdisc_sleeping = qdisc; |
1da177e4 LT |
532 | } |
533 | ||
cacaddf5 TC |
534 | if (!netif_carrier_ok(dev)) |
535 | /* Delay activation until next carrier-on event */ | |
536 | return; | |
537 | ||
1da177e4 LT |
538 | spin_lock_bh(&dev->queue_lock); |
539 | rcu_assign_pointer(dev->qdisc, dev->qdisc_sleeping); | |
540 | if (dev->qdisc != &noqueue_qdisc) { | |
541 | dev->trans_start = jiffies; | |
542 | dev_watchdog_up(dev); | |
543 | } | |
544 | spin_unlock_bh(&dev->queue_lock); | |
545 | } | |
546 | ||
547 | void dev_deactivate(struct net_device *dev) | |
548 | { | |
549 | struct Qdisc *qdisc; | |
550 | ||
551 | spin_lock_bh(&dev->queue_lock); | |
552 | qdisc = dev->qdisc; | |
553 | dev->qdisc = &noop_qdisc; | |
554 | ||
555 | qdisc_reset(qdisc); | |
556 | ||
557 | spin_unlock_bh(&dev->queue_lock); | |
558 | ||
559 | dev_watchdog_down(dev); | |
560 | ||
d4828d85 HX |
561 | /* Wait for outstanding dev_queue_xmit calls. */ |
562 | synchronize_rcu(); | |
1da177e4 | 563 | |
d4828d85 HX |
564 | /* Wait for outstanding qdisc_run calls. */ |
565 | while (test_bit(__LINK_STATE_QDISC_RUNNING, &dev->state)) | |
566 | yield(); | |
f6a78bfc HX |
567 | |
568 | if (dev->gso_skb) { | |
569 | kfree_skb(dev->gso_skb); | |
570 | dev->gso_skb = NULL; | |
571 | } | |
1da177e4 LT |
572 | } |
573 | ||
574 | void dev_init_scheduler(struct net_device *dev) | |
575 | { | |
576 | qdisc_lock_tree(dev); | |
577 | dev->qdisc = &noop_qdisc; | |
578 | dev->qdisc_sleeping = &noop_qdisc; | |
579 | INIT_LIST_HEAD(&dev->qdisc_list); | |
580 | qdisc_unlock_tree(dev); | |
581 | ||
582 | dev_watchdog_init(dev); | |
583 | } | |
584 | ||
585 | void dev_shutdown(struct net_device *dev) | |
586 | { | |
587 | struct Qdisc *qdisc; | |
588 | ||
589 | qdisc_lock_tree(dev); | |
590 | qdisc = dev->qdisc_sleeping; | |
591 | dev->qdisc = &noop_qdisc; | |
592 | dev->qdisc_sleeping = &noop_qdisc; | |
593 | qdisc_destroy(qdisc); | |
594 | #if defined(CONFIG_NET_SCH_INGRESS) || defined(CONFIG_NET_SCH_INGRESS_MODULE) | |
10297b99 | 595 | if ((qdisc = dev->qdisc_ingress) != NULL) { |
1da177e4 LT |
596 | dev->qdisc_ingress = NULL; |
597 | qdisc_destroy(qdisc); | |
10297b99 | 598 | } |
1da177e4 LT |
599 | #endif |
600 | BUG_TRAP(!timer_pending(&dev->watchdog_timer)); | |
601 | qdisc_unlock_tree(dev); | |
602 | } | |
603 | ||
0a242efc DV |
604 | EXPORT_SYMBOL(netif_carrier_on); |
605 | EXPORT_SYMBOL(netif_carrier_off); | |
1da177e4 | 606 | EXPORT_SYMBOL(noop_qdisc); |
1da177e4 LT |
607 | EXPORT_SYMBOL(qdisc_create_dflt); |
608 | EXPORT_SYMBOL(qdisc_destroy); | |
609 | EXPORT_SYMBOL(qdisc_reset); | |
1da177e4 LT |
610 | EXPORT_SYMBOL(qdisc_lock_tree); |
611 | EXPORT_SYMBOL(qdisc_unlock_tree); |