Commit | Line | Data |
---|---|---|
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: | |
41a23b07 HX |
165 | if (unlikely(q == &noop_qdisc)) |
166 | kfree_skb(skb); | |
167 | else if (skb->next) | |
f6a78bfc HX |
168 | dev->gso_skb = skb; |
169 | else | |
170 | q->ops->requeue(skb, q); | |
1da177e4 | 171 | netif_schedule(dev); |
1da177e4 | 172 | } |
36247f54 | 173 | return 0; |
d90df3ad HX |
174 | |
175 | out: | |
8cbe1d46 | 176 | BUG_ON((int) q->q.qlen < 0); |
1da177e4 LT |
177 | return q->q.qlen; |
178 | } | |
179 | ||
48d83325 HX |
180 | void __qdisc_run(struct net_device *dev) |
181 | { | |
d90df3ad HX |
182 | do { |
183 | if (!qdisc_restart(dev)) | |
184 | break; | |
185 | } while (!netif_queue_stopped(dev)); | |
48d83325 HX |
186 | |
187 | clear_bit(__LINK_STATE_QDISC_RUNNING, &dev->state); | |
188 | } | |
189 | ||
1da177e4 LT |
190 | static void dev_watchdog(unsigned long arg) |
191 | { | |
192 | struct net_device *dev = (struct net_device *)arg; | |
193 | ||
932ff279 | 194 | netif_tx_lock(dev); |
1da177e4 LT |
195 | if (dev->qdisc != &noop_qdisc) { |
196 | if (netif_device_present(dev) && | |
197 | netif_running(dev) && | |
198 | netif_carrier_ok(dev)) { | |
199 | if (netif_queue_stopped(dev) && | |
338f7566 SH |
200 | time_after(jiffies, dev->trans_start + dev->watchdog_timeo)) { |
201 | ||
202 | printk(KERN_INFO "NETDEV WATCHDOG: %s: transmit timed out\n", | |
203 | dev->name); | |
1da177e4 LT |
204 | dev->tx_timeout(dev); |
205 | } | |
f5a6e01c | 206 | if (!mod_timer(&dev->watchdog_timer, round_jiffies(jiffies + dev->watchdog_timeo))) |
1da177e4 LT |
207 | dev_hold(dev); |
208 | } | |
209 | } | |
932ff279 | 210 | netif_tx_unlock(dev); |
1da177e4 LT |
211 | |
212 | dev_put(dev); | |
213 | } | |
214 | ||
215 | static void dev_watchdog_init(struct net_device *dev) | |
216 | { | |
217 | init_timer(&dev->watchdog_timer); | |
218 | dev->watchdog_timer.data = (unsigned long)dev; | |
219 | dev->watchdog_timer.function = dev_watchdog; | |
220 | } | |
221 | ||
222 | void __netdev_watchdog_up(struct net_device *dev) | |
223 | { | |
224 | if (dev->tx_timeout) { | |
225 | if (dev->watchdog_timeo <= 0) | |
226 | dev->watchdog_timeo = 5*HZ; | |
227 | if (!mod_timer(&dev->watchdog_timer, jiffies + dev->watchdog_timeo)) | |
228 | dev_hold(dev); | |
229 | } | |
230 | } | |
231 | ||
232 | static void dev_watchdog_up(struct net_device *dev) | |
233 | { | |
1da177e4 | 234 | __netdev_watchdog_up(dev); |
1da177e4 LT |
235 | } |
236 | ||
237 | static void dev_watchdog_down(struct net_device *dev) | |
238 | { | |
932ff279 | 239 | netif_tx_lock_bh(dev); |
1da177e4 | 240 | if (del_timer(&dev->watchdog_timer)) |
15333061 | 241 | dev_put(dev); |
932ff279 | 242 | netif_tx_unlock_bh(dev); |
1da177e4 LT |
243 | } |
244 | ||
0a242efc DV |
245 | void netif_carrier_on(struct net_device *dev) |
246 | { | |
247 | if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) | |
248 | linkwatch_fire_event(dev); | |
249 | if (netif_running(dev)) | |
250 | __netdev_watchdog_up(dev); | |
251 | } | |
252 | ||
253 | void netif_carrier_off(struct net_device *dev) | |
254 | { | |
255 | if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) | |
256 | linkwatch_fire_event(dev); | |
257 | } | |
258 | ||
1da177e4 LT |
259 | /* "NOOP" scheduler: the best scheduler, recommended for all interfaces |
260 | under all circumstances. It is difficult to invent anything faster or | |
261 | cheaper. | |
262 | */ | |
263 | ||
94df109a | 264 | static int noop_enqueue(struct sk_buff *skb, struct Qdisc * qdisc) |
1da177e4 LT |
265 | { |
266 | kfree_skb(skb); | |
267 | return NET_XMIT_CN; | |
268 | } | |
269 | ||
94df109a | 270 | static struct sk_buff *noop_dequeue(struct Qdisc * qdisc) |
1da177e4 LT |
271 | { |
272 | return NULL; | |
273 | } | |
274 | ||
94df109a | 275 | static int noop_requeue(struct sk_buff *skb, struct Qdisc* qdisc) |
1da177e4 LT |
276 | { |
277 | if (net_ratelimit()) | |
94df109a TG |
278 | printk(KERN_DEBUG "%s deferred output. It is buggy.\n", |
279 | skb->dev->name); | |
1da177e4 LT |
280 | kfree_skb(skb); |
281 | return NET_XMIT_CN; | |
282 | } | |
283 | ||
284 | struct Qdisc_ops noop_qdisc_ops = { | |
1da177e4 LT |
285 | .id = "noop", |
286 | .priv_size = 0, | |
287 | .enqueue = noop_enqueue, | |
288 | .dequeue = noop_dequeue, | |
289 | .requeue = noop_requeue, | |
290 | .owner = THIS_MODULE, | |
291 | }; | |
292 | ||
293 | struct Qdisc noop_qdisc = { | |
294 | .enqueue = noop_enqueue, | |
295 | .dequeue = noop_dequeue, | |
296 | .flags = TCQ_F_BUILTIN, | |
10297b99 | 297 | .ops = &noop_qdisc_ops, |
1da177e4 LT |
298 | .list = LIST_HEAD_INIT(noop_qdisc.list), |
299 | }; | |
300 | ||
301 | static struct Qdisc_ops noqueue_qdisc_ops = { | |
1da177e4 LT |
302 | .id = "noqueue", |
303 | .priv_size = 0, | |
304 | .enqueue = noop_enqueue, | |
305 | .dequeue = noop_dequeue, | |
306 | .requeue = noop_requeue, | |
307 | .owner = THIS_MODULE, | |
308 | }; | |
309 | ||
310 | static struct Qdisc noqueue_qdisc = { | |
311 | .enqueue = NULL, | |
312 | .dequeue = noop_dequeue, | |
313 | .flags = TCQ_F_BUILTIN, | |
314 | .ops = &noqueue_qdisc_ops, | |
315 | .list = LIST_HEAD_INIT(noqueue_qdisc.list), | |
316 | }; | |
317 | ||
318 | ||
319 | static const u8 prio2band[TC_PRIO_MAX+1] = | |
320 | { 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 }; | |
321 | ||
322 | /* 3-band FIFO queue: old style, but should be a bit faster than | |
323 | generic prio+fifo combination. | |
324 | */ | |
325 | ||
f87a9c3d TG |
326 | #define PFIFO_FAST_BANDS 3 |
327 | ||
321090e7 TG |
328 | static inline struct sk_buff_head *prio2list(struct sk_buff *skb, |
329 | struct Qdisc *qdisc) | |
1da177e4 LT |
330 | { |
331 | struct sk_buff_head *list = qdisc_priv(qdisc); | |
321090e7 TG |
332 | return list + prio2band[skb->priority & TC_PRIO_MAX]; |
333 | } | |
1da177e4 | 334 | |
f87a9c3d | 335 | static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc* qdisc) |
321090e7 TG |
336 | { |
337 | struct sk_buff_head *list = prio2list(skb, qdisc); | |
1da177e4 | 338 | |
821d24ae | 339 | if (skb_queue_len(list) < qdisc->dev->tx_queue_len) { |
1da177e4 | 340 | qdisc->q.qlen++; |
821d24ae | 341 | return __qdisc_enqueue_tail(skb, qdisc, list); |
1da177e4 | 342 | } |
821d24ae TG |
343 | |
344 | return qdisc_drop(skb, qdisc); | |
1da177e4 LT |
345 | } |
346 | ||
f87a9c3d | 347 | static struct sk_buff *pfifo_fast_dequeue(struct Qdisc* qdisc) |
1da177e4 LT |
348 | { |
349 | int prio; | |
350 | struct sk_buff_head *list = qdisc_priv(qdisc); | |
1da177e4 | 351 | |
452f299d TG |
352 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) { |
353 | if (!skb_queue_empty(list + prio)) { | |
1da177e4 | 354 | qdisc->q.qlen--; |
452f299d | 355 | return __qdisc_dequeue_head(qdisc, list + prio); |
1da177e4 LT |
356 | } |
357 | } | |
f87a9c3d | 358 | |
1da177e4 LT |
359 | return NULL; |
360 | } | |
361 | ||
f87a9c3d | 362 | static int pfifo_fast_requeue(struct sk_buff *skb, struct Qdisc* qdisc) |
1da177e4 | 363 | { |
1da177e4 | 364 | qdisc->q.qlen++; |
321090e7 | 365 | return __qdisc_requeue(skb, qdisc, prio2list(skb, qdisc)); |
1da177e4 LT |
366 | } |
367 | ||
f87a9c3d | 368 | static void pfifo_fast_reset(struct Qdisc* qdisc) |
1da177e4 LT |
369 | { |
370 | int prio; | |
371 | struct sk_buff_head *list = qdisc_priv(qdisc); | |
372 | ||
f87a9c3d | 373 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
821d24ae TG |
374 | __qdisc_reset_queue(qdisc, list + prio); |
375 | ||
376 | qdisc->qstats.backlog = 0; | |
1da177e4 LT |
377 | qdisc->q.qlen = 0; |
378 | } | |
379 | ||
380 | static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) | |
381 | { | |
f87a9c3d | 382 | struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; |
1da177e4 | 383 | |
1da177e4 LT |
384 | memcpy(&opt.priomap, prio2band, TC_PRIO_MAX+1); |
385 | RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt); | |
386 | return skb->len; | |
387 | ||
388 | rtattr_failure: | |
1da177e4 LT |
389 | return -1; |
390 | } | |
391 | ||
392 | static int pfifo_fast_init(struct Qdisc *qdisc, struct rtattr *opt) | |
393 | { | |
f87a9c3d | 394 | int prio; |
1da177e4 LT |
395 | struct sk_buff_head *list = qdisc_priv(qdisc); |
396 | ||
f87a9c3d TG |
397 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) |
398 | skb_queue_head_init(list + prio); | |
1da177e4 LT |
399 | |
400 | return 0; | |
401 | } | |
402 | ||
403 | static struct Qdisc_ops pfifo_fast_ops = { | |
1da177e4 | 404 | .id = "pfifo_fast", |
f87a9c3d | 405 | .priv_size = PFIFO_FAST_BANDS * sizeof(struct sk_buff_head), |
1da177e4 LT |
406 | .enqueue = pfifo_fast_enqueue, |
407 | .dequeue = pfifo_fast_dequeue, | |
408 | .requeue = pfifo_fast_requeue, | |
409 | .init = pfifo_fast_init, | |
410 | .reset = pfifo_fast_reset, | |
411 | .dump = pfifo_fast_dump, | |
412 | .owner = THIS_MODULE, | |
413 | }; | |
414 | ||
3d54b82f | 415 | struct Qdisc *qdisc_alloc(struct net_device *dev, struct Qdisc_ops *ops) |
1da177e4 LT |
416 | { |
417 | void *p; | |
418 | struct Qdisc *sch; | |
3d54b82f TG |
419 | unsigned int size; |
420 | int err = -ENOBUFS; | |
1da177e4 LT |
421 | |
422 | /* ensure that the Qdisc and the private data are 32-byte aligned */ | |
3d54b82f TG |
423 | size = QDISC_ALIGN(sizeof(*sch)); |
424 | size += ops->priv_size + (QDISC_ALIGNTO - 1); | |
1da177e4 | 425 | |
0da974f4 | 426 | p = kzalloc(size, GFP_KERNEL); |
1da177e4 | 427 | if (!p) |
3d54b82f | 428 | goto errout; |
3d54b82f TG |
429 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); |
430 | sch->padded = (char *) sch - (char *) p; | |
1da177e4 LT |
431 | |
432 | INIT_LIST_HEAD(&sch->list); | |
433 | skb_queue_head_init(&sch->q); | |
434 | sch->ops = ops; | |
435 | sch->enqueue = ops->enqueue; | |
436 | sch->dequeue = ops->dequeue; | |
437 | sch->dev = dev; | |
438 | dev_hold(dev); | |
1da177e4 | 439 | atomic_set(&sch->refcnt, 1); |
3d54b82f TG |
440 | |
441 | return sch; | |
442 | errout: | |
443 | return ERR_PTR(-err); | |
444 | } | |
445 | ||
9f9afec4 PM |
446 | struct Qdisc * qdisc_create_dflt(struct net_device *dev, struct Qdisc_ops *ops, |
447 | unsigned int parentid) | |
3d54b82f TG |
448 | { |
449 | struct Qdisc *sch; | |
10297b99 | 450 | |
3d54b82f TG |
451 | sch = qdisc_alloc(dev, ops); |
452 | if (IS_ERR(sch)) | |
453 | goto errout; | |
fd44de7c | 454 | sch->stats_lock = &dev->queue_lock; |
9f9afec4 | 455 | sch->parent = parentid; |
3d54b82f | 456 | |
1da177e4 LT |
457 | if (!ops->init || ops->init(sch, NULL) == 0) |
458 | return sch; | |
459 | ||
0fbbeb1b | 460 | qdisc_destroy(sch); |
3d54b82f | 461 | errout: |
1da177e4 LT |
462 | return NULL; |
463 | } | |
464 | ||
465 | /* Under dev->queue_lock and BH! */ | |
466 | ||
467 | void qdisc_reset(struct Qdisc *qdisc) | |
468 | { | |
469 | struct Qdisc_ops *ops = qdisc->ops; | |
470 | ||
471 | if (ops->reset) | |
472 | ops->reset(qdisc); | |
473 | } | |
474 | ||
10297b99 | 475 | /* this is the rcu callback function to clean up a qdisc when there |
1da177e4 LT |
476 | * are no further references to it */ |
477 | ||
478 | static void __qdisc_destroy(struct rcu_head *head) | |
479 | { | |
480 | struct Qdisc *qdisc = container_of(head, struct Qdisc, q_rcu); | |
1da177e4 LT |
481 | kfree((char *) qdisc - qdisc->padded); |
482 | } | |
483 | ||
484 | /* Under dev->queue_lock and BH! */ | |
485 | ||
486 | void qdisc_destroy(struct Qdisc *qdisc) | |
487 | { | |
85670cc1 | 488 | struct Qdisc_ops *ops = qdisc->ops; |
1da177e4 LT |
489 | |
490 | if (qdisc->flags & TCQ_F_BUILTIN || | |
85670cc1 | 491 | !atomic_dec_and_test(&qdisc->refcnt)) |
1da177e4 LT |
492 | return; |
493 | ||
85670cc1 PM |
494 | list_del(&qdisc->list); |
495 | #ifdef CONFIG_NET_ESTIMATOR | |
496 | gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est); | |
497 | #endif | |
498 | if (ops->reset) | |
499 | ops->reset(qdisc); | |
500 | if (ops->destroy) | |
501 | ops->destroy(qdisc); | |
1da177e4 | 502 | |
85670cc1 PM |
503 | module_put(ops->owner); |
504 | dev_put(qdisc->dev); | |
1da177e4 LT |
505 | call_rcu(&qdisc->q_rcu, __qdisc_destroy); |
506 | } | |
507 | ||
508 | void dev_activate(struct net_device *dev) | |
509 | { | |
510 | /* No queueing discipline is attached to device; | |
511 | create default one i.e. pfifo_fast for devices, | |
512 | which need queueing and noqueue_qdisc for | |
513 | virtual interfaces | |
514 | */ | |
515 | ||
516 | if (dev->qdisc_sleeping == &noop_qdisc) { | |
517 | struct Qdisc *qdisc; | |
518 | if (dev->tx_queue_len) { | |
9f9afec4 PM |
519 | qdisc = qdisc_create_dflt(dev, &pfifo_fast_ops, |
520 | TC_H_ROOT); | |
1da177e4 LT |
521 | if (qdisc == NULL) { |
522 | printk(KERN_INFO "%s: activation failed\n", dev->name); | |
523 | return; | |
524 | } | |
1da177e4 | 525 | list_add_tail(&qdisc->list, &dev->qdisc_list); |
1da177e4 LT |
526 | } else { |
527 | qdisc = &noqueue_qdisc; | |
528 | } | |
1da177e4 | 529 | dev->qdisc_sleeping = qdisc; |
1da177e4 LT |
530 | } |
531 | ||
cacaddf5 TC |
532 | if (!netif_carrier_ok(dev)) |
533 | /* Delay activation until next carrier-on event */ | |
534 | return; | |
535 | ||
1da177e4 LT |
536 | spin_lock_bh(&dev->queue_lock); |
537 | rcu_assign_pointer(dev->qdisc, dev->qdisc_sleeping); | |
538 | if (dev->qdisc != &noqueue_qdisc) { | |
539 | dev->trans_start = jiffies; | |
540 | dev_watchdog_up(dev); | |
541 | } | |
542 | spin_unlock_bh(&dev->queue_lock); | |
543 | } | |
544 | ||
545 | void dev_deactivate(struct net_device *dev) | |
546 | { | |
547 | struct Qdisc *qdisc; | |
41a23b07 | 548 | struct sk_buff *skb; |
1da177e4 LT |
549 | |
550 | spin_lock_bh(&dev->queue_lock); | |
551 | qdisc = dev->qdisc; | |
552 | dev->qdisc = &noop_qdisc; | |
553 | ||
554 | qdisc_reset(qdisc); | |
555 | ||
41a23b07 HX |
556 | skb = dev->gso_skb; |
557 | dev->gso_skb = NULL; | |
1da177e4 LT |
558 | spin_unlock_bh(&dev->queue_lock); |
559 | ||
41a23b07 HX |
560 | kfree_skb(skb); |
561 | ||
1da177e4 LT |
562 | dev_watchdog_down(dev); |
563 | ||
d4828d85 HX |
564 | /* Wait for outstanding dev_queue_xmit calls. */ |
565 | synchronize_rcu(); | |
1da177e4 | 566 | |
d4828d85 HX |
567 | /* Wait for outstanding qdisc_run calls. */ |
568 | while (test_bit(__LINK_STATE_QDISC_RUNNING, &dev->state)) | |
569 | yield(); | |
1da177e4 LT |
570 | } |
571 | ||
572 | void dev_init_scheduler(struct net_device *dev) | |
573 | { | |
574 | qdisc_lock_tree(dev); | |
575 | dev->qdisc = &noop_qdisc; | |
576 | dev->qdisc_sleeping = &noop_qdisc; | |
577 | INIT_LIST_HEAD(&dev->qdisc_list); | |
578 | qdisc_unlock_tree(dev); | |
579 | ||
580 | dev_watchdog_init(dev); | |
581 | } | |
582 | ||
583 | void dev_shutdown(struct net_device *dev) | |
584 | { | |
585 | struct Qdisc *qdisc; | |
586 | ||
587 | qdisc_lock_tree(dev); | |
588 | qdisc = dev->qdisc_sleeping; | |
589 | dev->qdisc = &noop_qdisc; | |
590 | dev->qdisc_sleeping = &noop_qdisc; | |
591 | qdisc_destroy(qdisc); | |
592 | #if defined(CONFIG_NET_SCH_INGRESS) || defined(CONFIG_NET_SCH_INGRESS_MODULE) | |
10297b99 | 593 | if ((qdisc = dev->qdisc_ingress) != NULL) { |
1da177e4 LT |
594 | dev->qdisc_ingress = NULL; |
595 | qdisc_destroy(qdisc); | |
10297b99 | 596 | } |
1da177e4 LT |
597 | #endif |
598 | BUG_TRAP(!timer_pending(&dev->watchdog_timer)); | |
599 | qdisc_unlock_tree(dev); | |
600 | } | |
601 | ||
0a242efc DV |
602 | EXPORT_SYMBOL(netif_carrier_on); |
603 | EXPORT_SYMBOL(netif_carrier_off); | |
1da177e4 | 604 | EXPORT_SYMBOL(noop_qdisc); |
1da177e4 LT |
605 | EXPORT_SYMBOL(qdisc_create_dflt); |
606 | EXPORT_SYMBOL(qdisc_destroy); | |
607 | EXPORT_SYMBOL(qdisc_reset); | |
1da177e4 LT |
608 | EXPORT_SYMBOL(qdisc_lock_tree); |
609 | EXPORT_SYMBOL(qdisc_unlock_tree); |