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 | ||
1da177e4 | 14 | #include <linux/bitops.h> |
1da177e4 LT |
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> | |
1da177e4 | 20 | #include <linux/errno.h> |
1da177e4 LT |
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> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
07ce76aa | 28 | #include <linux/if_vlan.h> |
292f1c7f | 29 | #include <net/sch_generic.h> |
1da177e4 | 30 | #include <net/pkt_sched.h> |
7fee226a | 31 | #include <net/dst.h> |
1da177e4 | 32 | |
34aedd3f | 33 | /* Qdisc to use by default */ |
34 | const struct Qdisc_ops *default_qdisc_ops = &pfifo_fast_ops; | |
35 | EXPORT_SYMBOL(default_qdisc_ops); | |
36 | ||
1da177e4 LT |
37 | /* Main transmission queue. */ |
38 | ||
0463d4ae | 39 | /* Modifications to data participating in scheduling must be protected with |
5fb66229 | 40 | * qdisc_lock(qdisc) spinlock. |
0463d4ae PM |
41 | * |
42 | * The idea is the following: | |
c7e4f3bb DM |
43 | * - enqueue, dequeue are serialized via qdisc root lock |
44 | * - ingress filtering is also serialized via qdisc root lock | |
0463d4ae | 45 | * - updates to tree and tree walking are only done under the rtnl mutex. |
1da177e4 | 46 | */ |
1da177e4 | 47 | |
37437bb2 | 48 | static inline int dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q) |
c716a81a | 49 | { |
6252352d | 50 | q->gso_skb = skb; |
53e91503 | 51 | q->qstats.requeues++; |
a27758ff | 52 | qdisc_qstats_backlog_inc(q, skb); |
bbd8a0d3 | 53 | q->q.qlen++; /* it's still part of the queue */ |
37437bb2 | 54 | __netif_schedule(q); |
6252352d | 55 | |
c716a81a JHS |
56 | return 0; |
57 | } | |
58 | ||
55a93b3e ED |
59 | static void try_bulk_dequeue_skb(struct Qdisc *q, |
60 | struct sk_buff *skb, | |
b8358d70 JDB |
61 | const struct netdev_queue *txq, |
62 | int *packets) | |
5772e9a3 | 63 | { |
55a93b3e | 64 | int bytelimit = qdisc_avail_bulklimit(txq) - skb->len; |
5772e9a3 JDB |
65 | |
66 | while (bytelimit > 0) { | |
55a93b3e | 67 | struct sk_buff *nskb = q->dequeue(q); |
5772e9a3 | 68 | |
55a93b3e | 69 | if (!nskb) |
5772e9a3 JDB |
70 | break; |
71 | ||
55a93b3e ED |
72 | bytelimit -= nskb->len; /* covers GSO len */ |
73 | skb->next = nskb; | |
74 | skb = nskb; | |
b8358d70 | 75 | (*packets)++; /* GSO counts as one pkt */ |
5772e9a3 | 76 | } |
55a93b3e | 77 | skb->next = NULL; |
5772e9a3 JDB |
78 | } |
79 | ||
4d202a0d ED |
80 | /* This variant of try_bulk_dequeue_skb() makes sure |
81 | * all skbs in the chain are for the same txq | |
82 | */ | |
83 | static void try_bulk_dequeue_skb_slow(struct Qdisc *q, | |
84 | struct sk_buff *skb, | |
85 | int *packets) | |
86 | { | |
87 | int mapping = skb_get_queue_mapping(skb); | |
88 | struct sk_buff *nskb; | |
89 | int cnt = 0; | |
90 | ||
91 | do { | |
92 | nskb = q->dequeue(q); | |
93 | if (!nskb) | |
94 | break; | |
95 | if (unlikely(skb_get_queue_mapping(nskb) != mapping)) { | |
96 | q->skb_bad_txq = nskb; | |
97 | qdisc_qstats_backlog_inc(q, nskb); | |
98 | q->q.qlen++; | |
99 | break; | |
100 | } | |
101 | skb->next = nskb; | |
102 | skb = nskb; | |
103 | } while (++cnt < 8); | |
104 | (*packets) += cnt; | |
105 | skb->next = NULL; | |
106 | } | |
107 | ||
5772e9a3 JDB |
108 | /* Note that dequeue_skb can possibly return a SKB list (via skb->next). |
109 | * A requeued skb (via q->gso_skb) can also be a SKB list. | |
110 | */ | |
b8358d70 JDB |
111 | static struct sk_buff *dequeue_skb(struct Qdisc *q, bool *validate, |
112 | int *packets) | |
c716a81a | 113 | { |
554794de | 114 | struct sk_buff *skb = q->gso_skb; |
1abbe139 | 115 | const struct netdev_queue *txq = q->dev_queue; |
554794de | 116 | |
b8358d70 | 117 | *packets = 1; |
ebf05982 | 118 | if (unlikely(skb)) { |
4d202a0d ED |
119 | /* skb in gso_skb were already validated */ |
120 | *validate = false; | |
ebf05982 | 121 | /* check the reason of requeuing without tx lock first */ |
10c51b56 | 122 | txq = skb_get_tx_queue(txq->dev, skb); |
73466498 | 123 | if (!netif_xmit_frozen_or_stopped(txq)) { |
6252352d | 124 | q->gso_skb = NULL; |
a27758ff | 125 | qdisc_qstats_backlog_dec(q, skb); |
bbd8a0d3 KK |
126 | q->q.qlen--; |
127 | } else | |
ebf05982 | 128 | skb = NULL; |
4d202a0d ED |
129 | return skb; |
130 | } | |
131 | *validate = true; | |
132 | skb = q->skb_bad_txq; | |
133 | if (unlikely(skb)) { | |
134 | /* check the reason of requeuing without tx lock first */ | |
135 | txq = skb_get_tx_queue(txq->dev, skb); | |
136 | if (!netif_xmit_frozen_or_stopped(txq)) { | |
137 | q->skb_bad_txq = NULL; | |
138 | qdisc_qstats_backlog_dec(q, skb); | |
139 | q->q.qlen--; | |
140 | goto bulk; | |
50cbe9ab | 141 | } |
4d202a0d ED |
142 | return NULL; |
143 | } | |
144 | if (!(q->flags & TCQ_F_ONETXQUEUE) || | |
145 | !netif_xmit_frozen_or_stopped(txq)) | |
146 | skb = q->dequeue(q); | |
147 | if (skb) { | |
148 | bulk: | |
149 | if (qdisc_may_bulk(q)) | |
150 | try_bulk_dequeue_skb(q, skb, txq, packets); | |
151 | else | |
152 | try_bulk_dequeue_skb_slow(q, skb, packets); | |
ebf05982 | 153 | } |
c716a81a JHS |
154 | return skb; |
155 | } | |
156 | ||
10297b99 | 157 | /* |
10770bc2 | 158 | * Transmit possibly several skbs, and handle the return status as |
f9eb8aea | 159 | * required. Owning running seqcount bit guarantees that |
10770bc2 | 160 | * only one CPU can execute this function. |
6c1361a6 KK |
161 | * |
162 | * Returns to the caller: | |
163 | * 0 - queue is empty or throttled. | |
164 | * >0 - queue is not empty. | |
6c1361a6 | 165 | */ |
bbd8a0d3 KK |
166 | int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, |
167 | struct net_device *dev, struct netdev_queue *txq, | |
55a93b3e | 168 | spinlock_t *root_lock, bool validate) |
1da177e4 | 169 | { |
5f1a485d | 170 | int ret = NETDEV_TX_BUSY; |
7698b4fc DM |
171 | |
172 | /* And release qdisc */ | |
173 | spin_unlock(root_lock); | |
c716a81a | 174 | |
55a93b3e ED |
175 | /* Note that we validate skb (GSO, checksum, ...) outside of locks */ |
176 | if (validate) | |
177 | skb = validate_xmit_skb_list(skb, dev); | |
572a9d7b | 178 | |
3dcd493f | 179 | if (likely(skb)) { |
55a93b3e ED |
180 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
181 | if (!netif_xmit_frozen_or_stopped(txq)) | |
182 | skb = dev_hard_start_xmit(skb, dev, txq, &ret); | |
c716a81a | 183 | |
55a93b3e | 184 | HARD_TX_UNLOCK(dev, txq); |
3dcd493f | 185 | } else { |
52fbb290 | 186 | spin_lock(root_lock); |
3dcd493f | 187 | return qdisc_qlen(q); |
55a93b3e | 188 | } |
52fbb290 | 189 | spin_lock(root_lock); |
c716a81a | 190 | |
9a1654ba JP |
191 | if (dev_xmit_complete(ret)) { |
192 | /* Driver sent out skb successfully or skb was consumed */ | |
6c1361a6 | 193 | ret = qdisc_qlen(q); |
9a1654ba | 194 | } else { |
6c1361a6 | 195 | /* Driver returned NETDEV_TX_BUSY - requeue skb */ |
e87cc472 JP |
196 | if (unlikely(ret != NETDEV_TX_BUSY)) |
197 | net_warn_ratelimited("BUG %s code %d qlen %d\n", | |
198 | dev->name, ret, q->q.qlen); | |
6c1361a6 | 199 | |
37437bb2 | 200 | ret = dev_requeue_skb(skb, q); |
6c1361a6 | 201 | } |
c716a81a | 202 | |
73466498 | 203 | if (ret && netif_xmit_frozen_or_stopped(txq)) |
37437bb2 DM |
204 | ret = 0; |
205 | ||
6c1361a6 | 206 | return ret; |
1da177e4 LT |
207 | } |
208 | ||
bbd8a0d3 KK |
209 | /* |
210 | * NOTE: Called under qdisc_lock(q) with locally disabled BH. | |
211 | * | |
f9eb8aea | 212 | * running seqcount guarantees only one CPU can process |
bbd8a0d3 KK |
213 | * this qdisc at a time. qdisc_lock(q) serializes queue accesses for |
214 | * this queue. | |
215 | * | |
216 | * netif_tx_lock serializes accesses to device driver. | |
217 | * | |
218 | * qdisc_lock(q) and netif_tx_lock are mutually exclusive, | |
219 | * if one is grabbed, another must be free. | |
220 | * | |
221 | * Note, that this procedure can be called by a watchdog timer | |
222 | * | |
223 | * Returns to the caller: | |
224 | * 0 - queue is empty or throttled. | |
225 | * >0 - queue is not empty. | |
226 | * | |
227 | */ | |
b8358d70 | 228 | static inline int qdisc_restart(struct Qdisc *q, int *packets) |
bbd8a0d3 KK |
229 | { |
230 | struct netdev_queue *txq; | |
231 | struct net_device *dev; | |
232 | spinlock_t *root_lock; | |
233 | struct sk_buff *skb; | |
55a93b3e | 234 | bool validate; |
bbd8a0d3 KK |
235 | |
236 | /* Dequeue packet */ | |
b8358d70 | 237 | skb = dequeue_skb(q, &validate, packets); |
bbd8a0d3 KK |
238 | if (unlikely(!skb)) |
239 | return 0; | |
10c51b56 | 240 | |
bbd8a0d3 KK |
241 | root_lock = qdisc_lock(q); |
242 | dev = qdisc_dev(q); | |
10c51b56 | 243 | txq = skb_get_tx_queue(dev, skb); |
bbd8a0d3 | 244 | |
55a93b3e | 245 | return sch_direct_xmit(skb, q, dev, txq, root_lock, validate); |
bbd8a0d3 KK |
246 | } |
247 | ||
37437bb2 | 248 | void __qdisc_run(struct Qdisc *q) |
48d83325 | 249 | { |
d5b8aa1d | 250 | int quota = weight_p; |
b8358d70 | 251 | int packets; |
2ba2506c | 252 | |
b8358d70 | 253 | while (qdisc_restart(q, &packets)) { |
2ba2506c | 254 | /* |
d5b8aa1d | 255 | * Ordered by possible occurrence: Postpone processing if |
256 | * 1. we've exceeded packet quota | |
257 | * 2. another process needs the CPU; | |
2ba2506c | 258 | */ |
b8358d70 JDB |
259 | quota -= packets; |
260 | if (quota <= 0 || need_resched()) { | |
37437bb2 | 261 | __netif_schedule(q); |
d90df3ad | 262 | break; |
2ba2506c HX |
263 | } |
264 | } | |
48d83325 | 265 | |
bc135b23 | 266 | qdisc_run_end(q); |
48d83325 HX |
267 | } |
268 | ||
9d21493b ED |
269 | unsigned long dev_trans_start(struct net_device *dev) |
270 | { | |
07ce76aa | 271 | unsigned long val, res; |
9d21493b ED |
272 | unsigned int i; |
273 | ||
07ce76aa | 274 | if (is_vlan_dev(dev)) |
275 | dev = vlan_dev_real_dev(dev); | |
9b36627a FW |
276 | res = netdev_get_tx_queue(dev, 0)->trans_start; |
277 | for (i = 1; i < dev->num_tx_queues; i++) { | |
9d21493b ED |
278 | val = netdev_get_tx_queue(dev, i)->trans_start; |
279 | if (val && time_after(val, res)) | |
280 | res = val; | |
281 | } | |
07ce76aa | 282 | |
9d21493b ED |
283 | return res; |
284 | } | |
285 | EXPORT_SYMBOL(dev_trans_start); | |
286 | ||
1da177e4 LT |
287 | static void dev_watchdog(unsigned long arg) |
288 | { | |
289 | struct net_device *dev = (struct net_device *)arg; | |
290 | ||
932ff279 | 291 | netif_tx_lock(dev); |
e8a0464c | 292 | if (!qdisc_tx_is_noop(dev)) { |
1da177e4 LT |
293 | if (netif_device_present(dev) && |
294 | netif_running(dev) && | |
295 | netif_carrier_ok(dev)) { | |
9d21493b | 296 | int some_queue_timedout = 0; |
e8a0464c | 297 | unsigned int i; |
9d21493b | 298 | unsigned long trans_start; |
e8a0464c DM |
299 | |
300 | for (i = 0; i < dev->num_tx_queues; i++) { | |
301 | struct netdev_queue *txq; | |
302 | ||
303 | txq = netdev_get_tx_queue(dev, i); | |
9b36627a | 304 | trans_start = txq->trans_start; |
73466498 | 305 | if (netif_xmit_stopped(txq) && |
9d21493b ED |
306 | time_after(jiffies, (trans_start + |
307 | dev->watchdog_timeo))) { | |
308 | some_queue_timedout = 1; | |
ccf5ff69 | 309 | txq->trans_timeout++; |
e8a0464c DM |
310 | break; |
311 | } | |
312 | } | |
338f7566 | 313 | |
9d21493b | 314 | if (some_queue_timedout) { |
9d21493b | 315 | WARN_ONCE(1, KERN_INFO "NETDEV WATCHDOG: %s (%s): transmit queue %u timed out\n", |
3019de12 | 316 | dev->name, netdev_drivername(dev), i); |
d314774c | 317 | dev->netdev_ops->ndo_tx_timeout(dev); |
1da177e4 | 318 | } |
e8a0464c DM |
319 | if (!mod_timer(&dev->watchdog_timer, |
320 | round_jiffies(jiffies + | |
321 | dev->watchdog_timeo))) | |
1da177e4 LT |
322 | dev_hold(dev); |
323 | } | |
324 | } | |
932ff279 | 325 | netif_tx_unlock(dev); |
1da177e4 LT |
326 | |
327 | dev_put(dev); | |
328 | } | |
329 | ||
1da177e4 LT |
330 | void __netdev_watchdog_up(struct net_device *dev) |
331 | { | |
d314774c | 332 | if (dev->netdev_ops->ndo_tx_timeout) { |
1da177e4 LT |
333 | if (dev->watchdog_timeo <= 0) |
334 | dev->watchdog_timeo = 5*HZ; | |
60468d5b VP |
335 | if (!mod_timer(&dev->watchdog_timer, |
336 | round_jiffies(jiffies + dev->watchdog_timeo))) | |
1da177e4 LT |
337 | dev_hold(dev); |
338 | } | |
339 | } | |
340 | ||
341 | static void dev_watchdog_up(struct net_device *dev) | |
342 | { | |
1da177e4 | 343 | __netdev_watchdog_up(dev); |
1da177e4 LT |
344 | } |
345 | ||
346 | static void dev_watchdog_down(struct net_device *dev) | |
347 | { | |
932ff279 | 348 | netif_tx_lock_bh(dev); |
1da177e4 | 349 | if (del_timer(&dev->watchdog_timer)) |
15333061 | 350 | dev_put(dev); |
932ff279 | 351 | netif_tx_unlock_bh(dev); |
1da177e4 LT |
352 | } |
353 | ||
bea3348e SH |
354 | /** |
355 | * netif_carrier_on - set carrier | |
356 | * @dev: network device | |
357 | * | |
358 | * Device has detected that carrier. | |
359 | */ | |
0a242efc DV |
360 | void netif_carrier_on(struct net_device *dev) |
361 | { | |
bfaae0f0 | 362 | if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
b4730016 DM |
363 | if (dev->reg_state == NETREG_UNINITIALIZED) |
364 | return; | |
2d3b479d | 365 | atomic_inc(&dev->carrier_changes); |
0a242efc | 366 | linkwatch_fire_event(dev); |
bfaae0f0 JG |
367 | if (netif_running(dev)) |
368 | __netdev_watchdog_up(dev); | |
369 | } | |
0a242efc | 370 | } |
62e3ba1b | 371 | EXPORT_SYMBOL(netif_carrier_on); |
0a242efc | 372 | |
bea3348e SH |
373 | /** |
374 | * netif_carrier_off - clear carrier | |
375 | * @dev: network device | |
376 | * | |
377 | * Device has detected loss of carrier. | |
378 | */ | |
0a242efc DV |
379 | void netif_carrier_off(struct net_device *dev) |
380 | { | |
b4730016 DM |
381 | if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
382 | if (dev->reg_state == NETREG_UNINITIALIZED) | |
383 | return; | |
2d3b479d | 384 | atomic_inc(&dev->carrier_changes); |
0a242efc | 385 | linkwatch_fire_event(dev); |
b4730016 | 386 | } |
0a242efc | 387 | } |
62e3ba1b | 388 | EXPORT_SYMBOL(netif_carrier_off); |
0a242efc | 389 | |
1da177e4 LT |
390 | /* "NOOP" scheduler: the best scheduler, recommended for all interfaces |
391 | under all circumstances. It is difficult to invent anything faster or | |
392 | cheaper. | |
393 | */ | |
394 | ||
520ac30f ED |
395 | static int noop_enqueue(struct sk_buff *skb, struct Qdisc *qdisc, |
396 | struct sk_buff **to_free) | |
1da177e4 | 397 | { |
520ac30f | 398 | __qdisc_drop(skb, to_free); |
1da177e4 LT |
399 | return NET_XMIT_CN; |
400 | } | |
401 | ||
82d567c2 | 402 | static struct sk_buff *noop_dequeue(struct Qdisc *qdisc) |
1da177e4 LT |
403 | { |
404 | return NULL; | |
405 | } | |
406 | ||
20fea08b | 407 | struct Qdisc_ops noop_qdisc_ops __read_mostly = { |
1da177e4 LT |
408 | .id = "noop", |
409 | .priv_size = 0, | |
410 | .enqueue = noop_enqueue, | |
411 | .dequeue = noop_dequeue, | |
99c0db26 | 412 | .peek = noop_dequeue, |
1da177e4 LT |
413 | .owner = THIS_MODULE, |
414 | }; | |
415 | ||
7698b4fc | 416 | static struct netdev_queue noop_netdev_queue = { |
7698b4fc | 417 | .qdisc = &noop_qdisc, |
9f3ffae0 | 418 | .qdisc_sleeping = &noop_qdisc, |
7698b4fc DM |
419 | }; |
420 | ||
1da177e4 LT |
421 | struct Qdisc noop_qdisc = { |
422 | .enqueue = noop_enqueue, | |
423 | .dequeue = noop_dequeue, | |
424 | .flags = TCQ_F_BUILTIN, | |
10297b99 | 425 | .ops = &noop_qdisc_ops, |
83874000 | 426 | .q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock), |
7698b4fc | 427 | .dev_queue = &noop_netdev_queue, |
f9eb8aea | 428 | .running = SEQCNT_ZERO(noop_qdisc.running), |
7b5edbc4 | 429 | .busylock = __SPIN_LOCK_UNLOCKED(noop_qdisc.busylock), |
1da177e4 | 430 | }; |
62e3ba1b | 431 | EXPORT_SYMBOL(noop_qdisc); |
1da177e4 | 432 | |
d66d6c31 PS |
433 | static int noqueue_init(struct Qdisc *qdisc, struct nlattr *opt) |
434 | { | |
435 | /* register_qdisc() assigns a default of noop_enqueue if unset, | |
436 | * but __dev_queue_xmit() treats noqueue only as such | |
437 | * if this is NULL - so clear it here. */ | |
438 | qdisc->enqueue = NULL; | |
439 | return 0; | |
440 | } | |
441 | ||
442 | struct Qdisc_ops noqueue_qdisc_ops __read_mostly = { | |
1da177e4 LT |
443 | .id = "noqueue", |
444 | .priv_size = 0, | |
d66d6c31 | 445 | .init = noqueue_init, |
1da177e4 LT |
446 | .enqueue = noop_enqueue, |
447 | .dequeue = noop_dequeue, | |
99c0db26 | 448 | .peek = noop_dequeue, |
1da177e4 LT |
449 | .owner = THIS_MODULE, |
450 | }; | |
451 | ||
cc7ec456 ED |
452 | static const u8 prio2band[TC_PRIO_MAX + 1] = { |
453 | 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 | |
454 | }; | |
d3678b46 DM |
455 | |
456 | /* 3-band FIFO queue: old style, but should be a bit faster than | |
457 | generic prio+fifo combination. | |
458 | */ | |
459 | ||
460 | #define PFIFO_FAST_BANDS 3 | |
461 | ||
fd3ae5e8 KK |
462 | /* |
463 | * Private data for a pfifo_fast scheduler containing: | |
464 | * - queues for the three band | |
465 | * - bitmap indicating which of the bands contain skbs | |
466 | */ | |
467 | struct pfifo_fast_priv { | |
468 | u32 bitmap; | |
469 | struct sk_buff_head q[PFIFO_FAST_BANDS]; | |
470 | }; | |
471 | ||
472 | /* | |
473 | * Convert a bitmap to the first band number where an skb is queued, where: | |
474 | * bitmap=0 means there are no skbs on any band. | |
475 | * bitmap=1 means there is an skb on band 0. | |
476 | * bitmap=7 means there are skbs on all 3 bands, etc. | |
477 | */ | |
478 | static const int bitmap2band[] = {-1, 0, 1, 0, 2, 0, 1, 0}; | |
479 | ||
480 | static inline struct sk_buff_head *band2list(struct pfifo_fast_priv *priv, | |
481 | int band) | |
d3678b46 | 482 | { |
fd3ae5e8 | 483 | return priv->q + band; |
d3678b46 DM |
484 | } |
485 | ||
520ac30f ED |
486 | static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc, |
487 | struct sk_buff **to_free) | |
321090e7 | 488 | { |
a453e068 KK |
489 | if (skb_queue_len(&qdisc->q) < qdisc_dev(qdisc)->tx_queue_len) { |
490 | int band = prio2band[skb->priority & TC_PRIO_MAX]; | |
491 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); | |
492 | struct sk_buff_head *list = band2list(priv, band); | |
1da177e4 | 493 | |
fd3ae5e8 | 494 | priv->bitmap |= (1 << band); |
d3678b46 | 495 | qdisc->q.qlen++; |
821d24ae | 496 | return __qdisc_enqueue_tail(skb, qdisc, list); |
d3678b46 | 497 | } |
821d24ae | 498 | |
520ac30f | 499 | return qdisc_drop(skb, qdisc, to_free); |
1da177e4 LT |
500 | } |
501 | ||
cc7ec456 | 502 | static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc) |
1da177e4 | 503 | { |
fd3ae5e8 KK |
504 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
505 | int band = bitmap2band[priv->bitmap]; | |
1da177e4 | 506 | |
fd3ae5e8 KK |
507 | if (likely(band >= 0)) { |
508 | struct sk_buff_head *list = band2list(priv, band); | |
509 | struct sk_buff *skb = __qdisc_dequeue_head(qdisc, list); | |
510 | ||
511 | qdisc->q.qlen--; | |
512 | if (skb_queue_empty(list)) | |
513 | priv->bitmap &= ~(1 << band); | |
514 | ||
515 | return skb; | |
d3678b46 | 516 | } |
f87a9c3d | 517 | |
1da177e4 LT |
518 | return NULL; |
519 | } | |
520 | ||
cc7ec456 | 521 | static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc) |
99c0db26 | 522 | { |
fd3ae5e8 KK |
523 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
524 | int band = bitmap2band[priv->bitmap]; | |
525 | ||
526 | if (band >= 0) { | |
527 | struct sk_buff_head *list = band2list(priv, band); | |
99c0db26 | 528 | |
fd3ae5e8 | 529 | return skb_peek(list); |
99c0db26 JP |
530 | } |
531 | ||
532 | return NULL; | |
533 | } | |
534 | ||
cc7ec456 | 535 | static void pfifo_fast_reset(struct Qdisc *qdisc) |
1da177e4 | 536 | { |
d3678b46 | 537 | int prio; |
fd3ae5e8 | 538 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
d3678b46 DM |
539 | |
540 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) | |
1b5c5493 | 541 | __qdisc_reset_queue(band2list(priv, prio)); |
d3678b46 | 542 | |
fd3ae5e8 | 543 | priv->bitmap = 0; |
821d24ae | 544 | qdisc->qstats.backlog = 0; |
d3678b46 | 545 | qdisc->q.qlen = 0; |
1da177e4 LT |
546 | } |
547 | ||
d3678b46 DM |
548 | static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) |
549 | { | |
550 | struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; | |
551 | ||
cc7ec456 | 552 | memcpy(&opt.priomap, prio2band, TC_PRIO_MAX + 1); |
1b34ec43 DM |
553 | if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
554 | goto nla_put_failure; | |
d3678b46 DM |
555 | return skb->len; |
556 | ||
557 | nla_put_failure: | |
558 | return -1; | |
559 | } | |
560 | ||
561 | static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt) | |
562 | { | |
563 | int prio; | |
fd3ae5e8 | 564 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
d3678b46 DM |
565 | |
566 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) | |
ab34f648 | 567 | __skb_queue_head_init(band2list(priv, prio)); |
d3678b46 | 568 | |
23624935 ED |
569 | /* Can by-pass the queue discipline */ |
570 | qdisc->flags |= TCQ_F_CAN_BYPASS; | |
d3678b46 DM |
571 | return 0; |
572 | } | |
573 | ||
6ec1c69a | 574 | struct Qdisc_ops pfifo_fast_ops __read_mostly = { |
d3678b46 | 575 | .id = "pfifo_fast", |
fd3ae5e8 | 576 | .priv_size = sizeof(struct pfifo_fast_priv), |
d3678b46 DM |
577 | .enqueue = pfifo_fast_enqueue, |
578 | .dequeue = pfifo_fast_dequeue, | |
99c0db26 | 579 | .peek = pfifo_fast_peek, |
d3678b46 DM |
580 | .init = pfifo_fast_init, |
581 | .reset = pfifo_fast_reset, | |
582 | .dump = pfifo_fast_dump, | |
1da177e4 LT |
583 | .owner = THIS_MODULE, |
584 | }; | |
1f27cde3 | 585 | EXPORT_SYMBOL(pfifo_fast_ops); |
1da177e4 | 586 | |
23d3b8bf | 587 | static struct lock_class_key qdisc_tx_busylock; |
f9eb8aea | 588 | static struct lock_class_key qdisc_running_key; |
23d3b8bf | 589 | |
5ce2d488 | 590 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d2a7f269 | 591 | const struct Qdisc_ops *ops) |
1da177e4 LT |
592 | { |
593 | void *p; | |
594 | struct Qdisc *sch; | |
d276055c | 595 | unsigned int size = QDISC_ALIGN(sizeof(*sch)) + ops->priv_size; |
3d54b82f | 596 | int err = -ENOBUFS; |
23d3b8bf | 597 | struct net_device *dev = dev_queue->dev; |
1da177e4 | 598 | |
f2cd2d3e ED |
599 | p = kzalloc_node(size, GFP_KERNEL, |
600 | netdev_queue_numa_node_read(dev_queue)); | |
601 | ||
1da177e4 | 602 | if (!p) |
3d54b82f | 603 | goto errout; |
3d54b82f | 604 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); |
d276055c ED |
605 | /* if we got non aligned memory, ask more and do alignment ourself */ |
606 | if (sch != p) { | |
607 | kfree(p); | |
608 | p = kzalloc_node(size + QDISC_ALIGNTO - 1, GFP_KERNEL, | |
609 | netdev_queue_numa_node_read(dev_queue)); | |
610 | if (!p) | |
611 | goto errout; | |
612 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); | |
613 | sch->padded = (char *) sch - (char *) p; | |
614 | } | |
1da177e4 | 615 | skb_queue_head_init(&sch->q); |
23d3b8bf | 616 | |
79640a4c | 617 | spin_lock_init(&sch->busylock); |
23d3b8bf ED |
618 | lockdep_set_class(&sch->busylock, |
619 | dev->qdisc_tx_busylock ?: &qdisc_tx_busylock); | |
620 | ||
f9eb8aea ED |
621 | seqcount_init(&sch->running); |
622 | lockdep_set_class(&sch->running, | |
623 | dev->qdisc_running_key ?: &qdisc_running_key); | |
624 | ||
1da177e4 LT |
625 | sch->ops = ops; |
626 | sch->enqueue = ops->enqueue; | |
627 | sch->dequeue = ops->dequeue; | |
bb949fbd | 628 | sch->dev_queue = dev_queue; |
23d3b8bf | 629 | dev_hold(dev); |
1da177e4 | 630 | atomic_set(&sch->refcnt, 1); |
3d54b82f TG |
631 | |
632 | return sch; | |
633 | errout: | |
01e123d7 | 634 | return ERR_PTR(err); |
3d54b82f TG |
635 | } |
636 | ||
3511c913 | 637 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 638 | const struct Qdisc_ops *ops, |
639 | unsigned int parentid) | |
3d54b82f TG |
640 | { |
641 | struct Qdisc *sch; | |
10297b99 | 642 | |
6da7c8fc | 643 | if (!try_module_get(ops->owner)) |
166ee5b8 | 644 | return NULL; |
6da7c8fc | 645 | |
5ce2d488 | 646 | sch = qdisc_alloc(dev_queue, ops); |
166ee5b8 ED |
647 | if (IS_ERR(sch)) { |
648 | module_put(ops->owner); | |
649 | return NULL; | |
650 | } | |
9f9afec4 | 651 | sch->parent = parentid; |
3d54b82f | 652 | |
1da177e4 LT |
653 | if (!ops->init || ops->init(sch, NULL) == 0) |
654 | return sch; | |
655 | ||
0fbbeb1b | 656 | qdisc_destroy(sch); |
1da177e4 LT |
657 | return NULL; |
658 | } | |
62e3ba1b | 659 | EXPORT_SYMBOL(qdisc_create_dflt); |
1da177e4 | 660 | |
5fb66229 | 661 | /* Under qdisc_lock(qdisc) and BH! */ |
1da177e4 LT |
662 | |
663 | void qdisc_reset(struct Qdisc *qdisc) | |
664 | { | |
20fea08b | 665 | const struct Qdisc_ops *ops = qdisc->ops; |
1da177e4 LT |
666 | |
667 | if (ops->reset) | |
668 | ops->reset(qdisc); | |
67305ebc | 669 | |
4d202a0d ED |
670 | kfree_skb(qdisc->skb_bad_txq); |
671 | qdisc->skb_bad_txq = NULL; | |
672 | ||
bbd8a0d3 | 673 | if (qdisc->gso_skb) { |
3f3c7eec | 674 | kfree_skb_list(qdisc->gso_skb); |
bbd8a0d3 | 675 | qdisc->gso_skb = NULL; |
bbd8a0d3 | 676 | } |
4d202a0d | 677 | qdisc->q.qlen = 0; |
1da177e4 | 678 | } |
62e3ba1b | 679 | EXPORT_SYMBOL(qdisc_reset); |
1da177e4 | 680 | |
5d944c64 ED |
681 | static void qdisc_rcu_free(struct rcu_head *head) |
682 | { | |
683 | struct Qdisc *qdisc = container_of(head, struct Qdisc, rcu_head); | |
684 | ||
73c20a8b | 685 | if (qdisc_is_percpu_stats(qdisc)) { |
22e0f8b9 | 686 | free_percpu(qdisc->cpu_bstats); |
73c20a8b JF |
687 | free_percpu(qdisc->cpu_qstats); |
688 | } | |
22e0f8b9 | 689 | |
5d944c64 ED |
690 | kfree((char *) qdisc - qdisc->padded); |
691 | } | |
692 | ||
1e0d5a57 | 693 | void qdisc_destroy(struct Qdisc *qdisc) |
1da177e4 | 694 | { |
8a34c5dc DM |
695 | const struct Qdisc_ops *ops = qdisc->ops; |
696 | ||
1e0d5a57 DM |
697 | if (qdisc->flags & TCQ_F_BUILTIN || |
698 | !atomic_dec_and_test(&qdisc->refcnt)) | |
699 | return; | |
700 | ||
3a682fbd | 701 | #ifdef CONFIG_NET_SCHED |
59cc1f61 | 702 | qdisc_hash_del(qdisc); |
f6e0b239 | 703 | |
a2da570d | 704 | qdisc_put_stab(rtnl_dereference(qdisc->stab)); |
3a682fbd | 705 | #endif |
8a34c5dc DM |
706 | gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est); |
707 | if (ops->reset) | |
708 | ops->reset(qdisc); | |
709 | if (ops->destroy) | |
710 | ops->destroy(qdisc); | |
711 | ||
712 | module_put(ops->owner); | |
713 | dev_put(qdisc_dev(qdisc)); | |
714 | ||
3f3c7eec | 715 | kfree_skb_list(qdisc->gso_skb); |
4d202a0d | 716 | kfree_skb(qdisc->skb_bad_txq); |
5d944c64 ED |
717 | /* |
718 | * gen_estimator est_timer() might access qdisc->q.lock, | |
719 | * wait a RCU grace period before freeing qdisc. | |
720 | */ | |
721 | call_rcu(&qdisc->rcu_head, qdisc_rcu_free); | |
1da177e4 | 722 | } |
62e3ba1b | 723 | EXPORT_SYMBOL(qdisc_destroy); |
1da177e4 | 724 | |
589983cd PM |
725 | /* Attach toplevel qdisc to device queue. */ |
726 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
727 | struct Qdisc *qdisc) | |
728 | { | |
729 | struct Qdisc *oqdisc = dev_queue->qdisc_sleeping; | |
730 | spinlock_t *root_lock; | |
731 | ||
732 | root_lock = qdisc_lock(oqdisc); | |
733 | spin_lock_bh(root_lock); | |
734 | ||
735 | /* Prune old scheduler */ | |
736 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) | |
737 | qdisc_reset(oqdisc); | |
738 | ||
739 | /* ... and graft new one */ | |
740 | if (qdisc == NULL) | |
741 | qdisc = &noop_qdisc; | |
742 | dev_queue->qdisc_sleeping = qdisc; | |
743 | rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc); | |
744 | ||
745 | spin_unlock_bh(root_lock); | |
746 | ||
747 | return oqdisc; | |
748 | } | |
b8970f0b | 749 | EXPORT_SYMBOL(dev_graft_qdisc); |
589983cd | 750 | |
e8a0464c DM |
751 | static void attach_one_default_qdisc(struct net_device *dev, |
752 | struct netdev_queue *dev_queue, | |
753 | void *_unused) | |
754 | { | |
3e692f21 PS |
755 | struct Qdisc *qdisc; |
756 | const struct Qdisc_ops *ops = default_qdisc_ops; | |
e8a0464c | 757 | |
3e692f21 PS |
758 | if (dev->priv_flags & IFF_NO_QUEUE) |
759 | ops = &noqueue_qdisc_ops; | |
760 | ||
761 | qdisc = qdisc_create_dflt(dev_queue, ops, TC_H_ROOT); | |
762 | if (!qdisc) { | |
763 | netdev_info(dev, "activation failed\n"); | |
764 | return; | |
e8a0464c | 765 | } |
3e692f21 | 766 | if (!netif_is_multiqueue(dev)) |
4eaf3b84 | 767 | qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; |
e8a0464c DM |
768 | dev_queue->qdisc_sleeping = qdisc; |
769 | } | |
770 | ||
6ec1c69a DM |
771 | static void attach_default_qdiscs(struct net_device *dev) |
772 | { | |
773 | struct netdev_queue *txq; | |
774 | struct Qdisc *qdisc; | |
775 | ||
776 | txq = netdev_get_tx_queue(dev, 0); | |
777 | ||
4b469955 | 778 | if (!netif_is_multiqueue(dev) || |
4b469955 | 779 | dev->priv_flags & IFF_NO_QUEUE) { |
6ec1c69a DM |
780 | netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL); |
781 | dev->qdisc = txq->qdisc_sleeping; | |
782 | atomic_inc(&dev->qdisc->refcnt); | |
783 | } else { | |
3511c913 | 784 | qdisc = qdisc_create_dflt(txq, &mq_qdisc_ops, TC_H_ROOT); |
6ec1c69a | 785 | if (qdisc) { |
6ec1c69a | 786 | dev->qdisc = qdisc; |
e57a784d | 787 | qdisc->ops->attach(qdisc); |
6ec1c69a DM |
788 | } |
789 | } | |
59cc1f61 JK |
790 | #ifdef CONFIG_NET_SCHED |
791 | if (dev->qdisc) | |
792 | qdisc_hash_add(dev->qdisc); | |
793 | #endif | |
6ec1c69a DM |
794 | } |
795 | ||
e8a0464c DM |
796 | static void transition_one_qdisc(struct net_device *dev, |
797 | struct netdev_queue *dev_queue, | |
798 | void *_need_watchdog) | |
799 | { | |
83874000 | 800 | struct Qdisc *new_qdisc = dev_queue->qdisc_sleeping; |
e8a0464c DM |
801 | int *need_watchdog_p = _need_watchdog; |
802 | ||
a9312ae8 DM |
803 | if (!(new_qdisc->flags & TCQ_F_BUILTIN)) |
804 | clear_bit(__QDISC_STATE_DEACTIVATED, &new_qdisc->state); | |
805 | ||
83874000 | 806 | rcu_assign_pointer(dev_queue->qdisc, new_qdisc); |
3e692f21 | 807 | if (need_watchdog_p) { |
9d21493b | 808 | dev_queue->trans_start = 0; |
e8a0464c | 809 | *need_watchdog_p = 1; |
9d21493b | 810 | } |
e8a0464c DM |
811 | } |
812 | ||
1da177e4 LT |
813 | void dev_activate(struct net_device *dev) |
814 | { | |
e8a0464c | 815 | int need_watchdog; |
b0e1e646 | 816 | |
1da177e4 | 817 | /* No queueing discipline is attached to device; |
6da7c8fc | 818 | * create default one for devices, which need queueing |
819 | * and noqueue_qdisc for virtual interfaces | |
1da177e4 LT |
820 | */ |
821 | ||
6ec1c69a DM |
822 | if (dev->qdisc == &noop_qdisc) |
823 | attach_default_qdiscs(dev); | |
af356afa | 824 | |
cacaddf5 TC |
825 | if (!netif_carrier_ok(dev)) |
826 | /* Delay activation until next carrier-on event */ | |
827 | return; | |
828 | ||
e8a0464c DM |
829 | need_watchdog = 0; |
830 | netdev_for_each_tx_queue(dev, transition_one_qdisc, &need_watchdog); | |
24824a09 ED |
831 | if (dev_ingress_queue(dev)) |
832 | transition_one_qdisc(dev, dev_ingress_queue(dev), NULL); | |
e8a0464c DM |
833 | |
834 | if (need_watchdog) { | |
860e9538 | 835 | netif_trans_update(dev); |
1da177e4 LT |
836 | dev_watchdog_up(dev); |
837 | } | |
b0e1e646 | 838 | } |
b8970f0b | 839 | EXPORT_SYMBOL(dev_activate); |
b0e1e646 | 840 | |
e8a0464c DM |
841 | static void dev_deactivate_queue(struct net_device *dev, |
842 | struct netdev_queue *dev_queue, | |
843 | void *_qdisc_default) | |
b0e1e646 | 844 | { |
e8a0464c | 845 | struct Qdisc *qdisc_default = _qdisc_default; |
970565bb | 846 | struct Qdisc *qdisc; |
970565bb | 847 | |
46e5da40 | 848 | qdisc = rtnl_dereference(dev_queue->qdisc); |
b0e1e646 | 849 | if (qdisc) { |
83874000 DM |
850 | spin_lock_bh(qdisc_lock(qdisc)); |
851 | ||
a9312ae8 DM |
852 | if (!(qdisc->flags & TCQ_F_BUILTIN)) |
853 | set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state); | |
854 | ||
f7a54c13 | 855 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
b0e1e646 | 856 | qdisc_reset(qdisc); |
d3b753db | 857 | |
83874000 | 858 | spin_unlock_bh(qdisc_lock(qdisc)); |
b0e1e646 | 859 | } |
1da177e4 LT |
860 | } |
861 | ||
4335cd2d | 862 | static bool some_qdisc_is_busy(struct net_device *dev) |
e8a0464c DM |
863 | { |
864 | unsigned int i; | |
865 | ||
866 | for (i = 0; i < dev->num_tx_queues; i++) { | |
867 | struct netdev_queue *dev_queue; | |
7698b4fc | 868 | spinlock_t *root_lock; |
e2627c8c | 869 | struct Qdisc *q; |
e8a0464c DM |
870 | int val; |
871 | ||
872 | dev_queue = netdev_get_tx_queue(dev, i); | |
b9a3b110 | 873 | q = dev_queue->qdisc_sleeping; |
5fb66229 | 874 | root_lock = qdisc_lock(q); |
e8a0464c | 875 | |
4335cd2d | 876 | spin_lock_bh(root_lock); |
e8a0464c | 877 | |
bc135b23 | 878 | val = (qdisc_is_running(q) || |
b9a3b110 | 879 | test_bit(__QDISC_STATE_SCHED, &q->state)); |
e8a0464c | 880 | |
4335cd2d | 881 | spin_unlock_bh(root_lock); |
e8a0464c DM |
882 | |
883 | if (val) | |
884 | return true; | |
885 | } | |
886 | return false; | |
887 | } | |
888 | ||
3137663d ED |
889 | /** |
890 | * dev_deactivate_many - deactivate transmissions on several devices | |
891 | * @head: list of devices to deactivate | |
892 | * | |
893 | * This function returns only when all outstanding transmissions | |
894 | * have completed, unless all devices are in dismantle phase. | |
895 | */ | |
44345724 | 896 | void dev_deactivate_many(struct list_head *head) |
1da177e4 | 897 | { |
44345724 | 898 | struct net_device *dev; |
3137663d | 899 | bool sync_needed = false; |
41a23b07 | 900 | |
5cde2829 | 901 | list_for_each_entry(dev, head, close_list) { |
44345724 OP |
902 | netdev_for_each_tx_queue(dev, dev_deactivate_queue, |
903 | &noop_qdisc); | |
904 | if (dev_ingress_queue(dev)) | |
905 | dev_deactivate_queue(dev, dev_ingress_queue(dev), | |
906 | &noop_qdisc); | |
907 | ||
908 | dev_watchdog_down(dev); | |
3137663d | 909 | sync_needed |= !dev->dismantle; |
44345724 | 910 | } |
1da177e4 | 911 | |
3137663d ED |
912 | /* Wait for outstanding qdisc-less dev_queue_xmit calls. |
913 | * This is avoided if all devices are in dismantle phase : | |
914 | * Caller will call synchronize_net() for us | |
915 | */ | |
916 | if (sync_needed) | |
917 | synchronize_net(); | |
1da177e4 | 918 | |
d4828d85 | 919 | /* Wait for outstanding qdisc_run calls. */ |
5cde2829 | 920 | list_for_each_entry(dev, head, close_list) |
44345724 OP |
921 | while (some_qdisc_is_busy(dev)) |
922 | yield(); | |
923 | } | |
924 | ||
925 | void dev_deactivate(struct net_device *dev) | |
926 | { | |
927 | LIST_HEAD(single); | |
928 | ||
5cde2829 | 929 | list_add(&dev->close_list, &single); |
44345724 | 930 | dev_deactivate_many(&single); |
5f04d506 | 931 | list_del(&single); |
1da177e4 | 932 | } |
b8970f0b | 933 | EXPORT_SYMBOL(dev_deactivate); |
1da177e4 | 934 | |
b0e1e646 DM |
935 | static void dev_init_scheduler_queue(struct net_device *dev, |
936 | struct netdev_queue *dev_queue, | |
e8a0464c | 937 | void *_qdisc) |
b0e1e646 | 938 | { |
e8a0464c DM |
939 | struct Qdisc *qdisc = _qdisc; |
940 | ||
46e5da40 | 941 | rcu_assign_pointer(dev_queue->qdisc, qdisc); |
b0e1e646 | 942 | dev_queue->qdisc_sleeping = qdisc; |
b0e1e646 DM |
943 | } |
944 | ||
1da177e4 LT |
945 | void dev_init_scheduler(struct net_device *dev) |
946 | { | |
af356afa | 947 | dev->qdisc = &noop_qdisc; |
e8a0464c | 948 | netdev_for_each_tx_queue(dev, dev_init_scheduler_queue, &noop_qdisc); |
24824a09 ED |
949 | if (dev_ingress_queue(dev)) |
950 | dev_init_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); | |
1da177e4 | 951 | |
b24b8a24 | 952 | setup_timer(&dev->watchdog_timer, dev_watchdog, (unsigned long)dev); |
1da177e4 LT |
953 | } |
954 | ||
e8a0464c DM |
955 | static void shutdown_scheduler_queue(struct net_device *dev, |
956 | struct netdev_queue *dev_queue, | |
957 | void *_qdisc_default) | |
1da177e4 | 958 | { |
b0e1e646 | 959 | struct Qdisc *qdisc = dev_queue->qdisc_sleeping; |
e8a0464c | 960 | struct Qdisc *qdisc_default = _qdisc_default; |
b0e1e646 DM |
961 | |
962 | if (qdisc) { | |
f7a54c13 | 963 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
b0e1e646 | 964 | dev_queue->qdisc_sleeping = qdisc_default; |
1da177e4 | 965 | |
1da177e4 | 966 | qdisc_destroy(qdisc); |
10297b99 | 967 | } |
b0e1e646 DM |
968 | } |
969 | ||
970 | void dev_shutdown(struct net_device *dev) | |
971 | { | |
e8a0464c | 972 | netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc); |
24824a09 ED |
973 | if (dev_ingress_queue(dev)) |
974 | shutdown_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); | |
af356afa PM |
975 | qdisc_destroy(dev->qdisc); |
976 | dev->qdisc = &noop_qdisc; | |
977 | ||
547b792c | 978 | WARN_ON(timer_pending(&dev->watchdog_timer)); |
1da177e4 | 979 | } |
292f1c7f | 980 | |
01cb71d2 | 981 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
982 | const struct tc_ratespec *conf, |
983 | u64 rate64) | |
292f1c7f | 984 | { |
01cb71d2 ED |
985 | memset(r, 0, sizeof(*r)); |
986 | r->overhead = conf->overhead; | |
3e1e3aae | 987 | r->rate_bytes_ps = max_t(u64, conf->rate, rate64); |
8a8e3d84 | 988 | r->linklayer = (conf->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
989 | r->mult = 1; |
990 | /* | |
130d3d68 ED |
991 | * The deal here is to replace a divide by a reciprocal one |
992 | * in fast path (a reciprocal divide is a multiply and a shift) | |
993 | * | |
994 | * Normal formula would be : | |
995 | * time_in_ns = (NSEC_PER_SEC * len) / rate_bps | |
996 | * | |
997 | * We compute mult/shift to use instead : | |
998 | * time_in_ns = (len * mult) >> shift; | |
999 | * | |
1000 | * We try to get the highest possible mult value for accuracy, | |
1001 | * but have to make sure no overflows will ever happen. | |
292f1c7f | 1002 | */ |
130d3d68 ED |
1003 | if (r->rate_bytes_ps > 0) { |
1004 | u64 factor = NSEC_PER_SEC; | |
1005 | ||
1006 | for (;;) { | |
1007 | r->mult = div64_u64(factor, r->rate_bytes_ps); | |
1008 | if (r->mult & (1U << 31) || factor & (1ULL << 63)) | |
292f1c7f | 1009 | break; |
130d3d68 ED |
1010 | factor <<= 1; |
1011 | r->shift++; | |
292f1c7f | 1012 | } |
292f1c7f JP |
1013 | } |
1014 | } | |
1015 | EXPORT_SYMBOL(psched_ratecfg_precompute); |