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 | ||
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 | { |
7fee226a | 50 | skb_dst_force(skb); |
6252352d | 51 | q->gso_skb = skb; |
53e91503 | 52 | q->qstats.requeues++; |
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 | ||
d3b753db | 59 | static inline struct sk_buff *dequeue_skb(struct Qdisc *q) |
c716a81a | 60 | { |
554794de | 61 | struct sk_buff *skb = q->gso_skb; |
1abbe139 | 62 | const struct netdev_queue *txq = q->dev_queue; |
554794de | 63 | |
ebf05982 | 64 | if (unlikely(skb)) { |
ebf05982 | 65 | /* check the reason of requeuing without tx lock first */ |
10c51b56 | 66 | txq = skb_get_tx_queue(txq->dev, skb); |
73466498 | 67 | if (!netif_xmit_frozen_or_stopped(txq)) { |
6252352d | 68 | q->gso_skb = NULL; |
bbd8a0d3 KK |
69 | q->q.qlen--; |
70 | } else | |
ebf05982 JP |
71 | skb = NULL; |
72 | } else { | |
50cbe9ab | 73 | if (!(q->flags & TCQ_F_ONETXQUEUE) || !netif_xmit_frozen_or_stopped(txq)) { |
1abbe139 | 74 | skb = q->dequeue(q); |
50cbe9ab DM |
75 | if (skb) |
76 | skb = validate_xmit_skb(skb, qdisc_dev(q)); | |
77 | } | |
ebf05982 | 78 | } |
c716a81a JHS |
79 | |
80 | return skb; | |
81 | } | |
82 | ||
6c1361a6 | 83 | static inline int handle_dev_cpu_collision(struct sk_buff *skb, |
970565bb | 84 | struct netdev_queue *dev_queue, |
6c1361a6 | 85 | struct Qdisc *q) |
c716a81a | 86 | { |
6c1361a6 | 87 | int ret; |
c716a81a | 88 | |
c773e847 | 89 | if (unlikely(dev_queue->xmit_lock_owner == smp_processor_id())) { |
6c1361a6 KK |
90 | /* |
91 | * Same CPU holding the lock. It may be a transient | |
92 | * configuration error, when hard_start_xmit() recurses. We | |
93 | * detect it by checking xmit owner and drop the packet when | |
94 | * deadloop is detected. Return OK to try the next skb. | |
95 | */ | |
10770bc2 | 96 | kfree_skb_list(skb); |
e87cc472 JP |
97 | net_warn_ratelimited("Dead loop on netdevice %s, fix it urgently!\n", |
98 | dev_queue->dev->name); | |
6c1361a6 KK |
99 | ret = qdisc_qlen(q); |
100 | } else { | |
101 | /* | |
102 | * Another cpu is holding lock, requeue & delay xmits for | |
103 | * some time. | |
104 | */ | |
d6d9ca0f | 105 | __this_cpu_inc(softnet_data.cpu_collision); |
37437bb2 | 106 | ret = dev_requeue_skb(skb, q); |
c716a81a JHS |
107 | } |
108 | ||
6c1361a6 | 109 | return ret; |
c716a81a JHS |
110 | } |
111 | ||
10297b99 | 112 | /* |
10770bc2 JDB |
113 | * Transmit possibly several skbs, and handle the return status as |
114 | * required. Holding the __QDISC___STATE_RUNNING bit guarantees that | |
115 | * only one CPU can execute this function. | |
6c1361a6 KK |
116 | * |
117 | * Returns to the caller: | |
118 | * 0 - queue is empty or throttled. | |
119 | * >0 - queue is not empty. | |
6c1361a6 | 120 | */ |
bbd8a0d3 KK |
121 | int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, |
122 | struct net_device *dev, struct netdev_queue *txq, | |
123 | spinlock_t *root_lock) | |
1da177e4 | 124 | { |
5f1a485d | 125 | int ret = NETDEV_TX_BUSY; |
7698b4fc DM |
126 | |
127 | /* And release qdisc */ | |
128 | spin_unlock(root_lock); | |
c716a81a | 129 | |
c773e847 | 130 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
73466498 | 131 | if (!netif_xmit_frozen_or_stopped(txq)) |
ce93718f | 132 | skb = dev_hard_start_xmit(skb, dev, txq, &ret); |
572a9d7b | 133 | |
c773e847 | 134 | HARD_TX_UNLOCK(dev, txq); |
c716a81a | 135 | |
7698b4fc | 136 | spin_lock(root_lock); |
c716a81a | 137 | |
9a1654ba JP |
138 | if (dev_xmit_complete(ret)) { |
139 | /* Driver sent out skb successfully or skb was consumed */ | |
6c1361a6 | 140 | ret = qdisc_qlen(q); |
9a1654ba | 141 | } else if (ret == NETDEV_TX_LOCKED) { |
6c1361a6 | 142 | /* Driver try lock failed */ |
eb6aafe3 | 143 | ret = handle_dev_cpu_collision(skb, txq, q); |
9a1654ba | 144 | } else { |
6c1361a6 | 145 | /* Driver returned NETDEV_TX_BUSY - requeue skb */ |
e87cc472 JP |
146 | if (unlikely(ret != NETDEV_TX_BUSY)) |
147 | net_warn_ratelimited("BUG %s code %d qlen %d\n", | |
148 | dev->name, ret, q->q.qlen); | |
6c1361a6 | 149 | |
37437bb2 | 150 | ret = dev_requeue_skb(skb, q); |
6c1361a6 | 151 | } |
c716a81a | 152 | |
73466498 | 153 | if (ret && netif_xmit_frozen_or_stopped(txq)) |
37437bb2 DM |
154 | ret = 0; |
155 | ||
6c1361a6 | 156 | return ret; |
1da177e4 LT |
157 | } |
158 | ||
bbd8a0d3 KK |
159 | /* |
160 | * NOTE: Called under qdisc_lock(q) with locally disabled BH. | |
161 | * | |
9bf2b8c2 | 162 | * __QDISC___STATE_RUNNING guarantees only one CPU can process |
bbd8a0d3 KK |
163 | * this qdisc at a time. qdisc_lock(q) serializes queue accesses for |
164 | * this queue. | |
165 | * | |
166 | * netif_tx_lock serializes accesses to device driver. | |
167 | * | |
168 | * qdisc_lock(q) and netif_tx_lock are mutually exclusive, | |
169 | * if one is grabbed, another must be free. | |
170 | * | |
171 | * Note, that this procedure can be called by a watchdog timer | |
172 | * | |
173 | * Returns to the caller: | |
174 | * 0 - queue is empty or throttled. | |
175 | * >0 - queue is not empty. | |
176 | * | |
177 | */ | |
178 | static inline int qdisc_restart(struct Qdisc *q) | |
179 | { | |
180 | struct netdev_queue *txq; | |
181 | struct net_device *dev; | |
182 | spinlock_t *root_lock; | |
183 | struct sk_buff *skb; | |
184 | ||
185 | /* Dequeue packet */ | |
186 | skb = dequeue_skb(q); | |
187 | if (unlikely(!skb)) | |
188 | return 0; | |
10c51b56 | 189 | |
7fee226a | 190 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
10c51b56 | 191 | |
bbd8a0d3 KK |
192 | root_lock = qdisc_lock(q); |
193 | dev = qdisc_dev(q); | |
10c51b56 | 194 | txq = skb_get_tx_queue(dev, skb); |
bbd8a0d3 KK |
195 | |
196 | return sch_direct_xmit(skb, q, dev, txq, root_lock); | |
197 | } | |
198 | ||
37437bb2 | 199 | void __qdisc_run(struct Qdisc *q) |
48d83325 | 200 | { |
d5b8aa1d | 201 | int quota = weight_p; |
2ba2506c | 202 | |
37437bb2 | 203 | while (qdisc_restart(q)) { |
2ba2506c | 204 | /* |
d5b8aa1d | 205 | * Ordered by possible occurrence: Postpone processing if |
206 | * 1. we've exceeded packet quota | |
207 | * 2. another process needs the CPU; | |
2ba2506c | 208 | */ |
f0c50c7c | 209 | if (--quota <= 0 || need_resched()) { |
37437bb2 | 210 | __netif_schedule(q); |
d90df3ad | 211 | break; |
2ba2506c HX |
212 | } |
213 | } | |
48d83325 | 214 | |
bc135b23 | 215 | qdisc_run_end(q); |
48d83325 HX |
216 | } |
217 | ||
9d21493b ED |
218 | unsigned long dev_trans_start(struct net_device *dev) |
219 | { | |
07ce76aa | 220 | unsigned long val, res; |
9d21493b ED |
221 | unsigned int i; |
222 | ||
07ce76aa | 223 | if (is_vlan_dev(dev)) |
224 | dev = vlan_dev_real_dev(dev); | |
225 | res = dev->trans_start; | |
9d21493b ED |
226 | for (i = 0; i < dev->num_tx_queues; i++) { |
227 | val = netdev_get_tx_queue(dev, i)->trans_start; | |
228 | if (val && time_after(val, res)) | |
229 | res = val; | |
230 | } | |
231 | dev->trans_start = res; | |
07ce76aa | 232 | |
9d21493b ED |
233 | return res; |
234 | } | |
235 | EXPORT_SYMBOL(dev_trans_start); | |
236 | ||
1da177e4 LT |
237 | static void dev_watchdog(unsigned long arg) |
238 | { | |
239 | struct net_device *dev = (struct net_device *)arg; | |
240 | ||
932ff279 | 241 | netif_tx_lock(dev); |
e8a0464c | 242 | if (!qdisc_tx_is_noop(dev)) { |
1da177e4 LT |
243 | if (netif_device_present(dev) && |
244 | netif_running(dev) && | |
245 | netif_carrier_ok(dev)) { | |
9d21493b | 246 | int some_queue_timedout = 0; |
e8a0464c | 247 | unsigned int i; |
9d21493b | 248 | unsigned long trans_start; |
e8a0464c DM |
249 | |
250 | for (i = 0; i < dev->num_tx_queues; i++) { | |
251 | struct netdev_queue *txq; | |
252 | ||
253 | txq = netdev_get_tx_queue(dev, i); | |
9d21493b ED |
254 | /* |
255 | * old device drivers set dev->trans_start | |
256 | */ | |
257 | trans_start = txq->trans_start ? : dev->trans_start; | |
73466498 | 258 | if (netif_xmit_stopped(txq) && |
9d21493b ED |
259 | time_after(jiffies, (trans_start + |
260 | dev->watchdog_timeo))) { | |
261 | some_queue_timedout = 1; | |
ccf5ff69 | 262 | txq->trans_timeout++; |
e8a0464c DM |
263 | break; |
264 | } | |
265 | } | |
338f7566 | 266 | |
9d21493b | 267 | if (some_queue_timedout) { |
9d21493b | 268 | WARN_ONCE(1, KERN_INFO "NETDEV WATCHDOG: %s (%s): transmit queue %u timed out\n", |
3019de12 | 269 | dev->name, netdev_drivername(dev), i); |
d314774c | 270 | dev->netdev_ops->ndo_tx_timeout(dev); |
1da177e4 | 271 | } |
e8a0464c DM |
272 | if (!mod_timer(&dev->watchdog_timer, |
273 | round_jiffies(jiffies + | |
274 | dev->watchdog_timeo))) | |
1da177e4 LT |
275 | dev_hold(dev); |
276 | } | |
277 | } | |
932ff279 | 278 | netif_tx_unlock(dev); |
1da177e4 LT |
279 | |
280 | dev_put(dev); | |
281 | } | |
282 | ||
1da177e4 LT |
283 | void __netdev_watchdog_up(struct net_device *dev) |
284 | { | |
d314774c | 285 | if (dev->netdev_ops->ndo_tx_timeout) { |
1da177e4 LT |
286 | if (dev->watchdog_timeo <= 0) |
287 | dev->watchdog_timeo = 5*HZ; | |
60468d5b VP |
288 | if (!mod_timer(&dev->watchdog_timer, |
289 | round_jiffies(jiffies + dev->watchdog_timeo))) | |
1da177e4 LT |
290 | dev_hold(dev); |
291 | } | |
292 | } | |
293 | ||
294 | static void dev_watchdog_up(struct net_device *dev) | |
295 | { | |
1da177e4 | 296 | __netdev_watchdog_up(dev); |
1da177e4 LT |
297 | } |
298 | ||
299 | static void dev_watchdog_down(struct net_device *dev) | |
300 | { | |
932ff279 | 301 | netif_tx_lock_bh(dev); |
1da177e4 | 302 | if (del_timer(&dev->watchdog_timer)) |
15333061 | 303 | dev_put(dev); |
932ff279 | 304 | netif_tx_unlock_bh(dev); |
1da177e4 LT |
305 | } |
306 | ||
bea3348e SH |
307 | /** |
308 | * netif_carrier_on - set carrier | |
309 | * @dev: network device | |
310 | * | |
311 | * Device has detected that carrier. | |
312 | */ | |
0a242efc DV |
313 | void netif_carrier_on(struct net_device *dev) |
314 | { | |
bfaae0f0 | 315 | if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
b4730016 DM |
316 | if (dev->reg_state == NETREG_UNINITIALIZED) |
317 | return; | |
2d3b479d | 318 | atomic_inc(&dev->carrier_changes); |
0a242efc | 319 | linkwatch_fire_event(dev); |
bfaae0f0 JG |
320 | if (netif_running(dev)) |
321 | __netdev_watchdog_up(dev); | |
322 | } | |
0a242efc | 323 | } |
62e3ba1b | 324 | EXPORT_SYMBOL(netif_carrier_on); |
0a242efc | 325 | |
bea3348e SH |
326 | /** |
327 | * netif_carrier_off - clear carrier | |
328 | * @dev: network device | |
329 | * | |
330 | * Device has detected loss of carrier. | |
331 | */ | |
0a242efc DV |
332 | void netif_carrier_off(struct net_device *dev) |
333 | { | |
b4730016 DM |
334 | if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
335 | if (dev->reg_state == NETREG_UNINITIALIZED) | |
336 | return; | |
2d3b479d | 337 | atomic_inc(&dev->carrier_changes); |
0a242efc | 338 | linkwatch_fire_event(dev); |
b4730016 | 339 | } |
0a242efc | 340 | } |
62e3ba1b | 341 | EXPORT_SYMBOL(netif_carrier_off); |
0a242efc | 342 | |
1da177e4 LT |
343 | /* "NOOP" scheduler: the best scheduler, recommended for all interfaces |
344 | under all circumstances. It is difficult to invent anything faster or | |
345 | cheaper. | |
346 | */ | |
347 | ||
82d567c2 | 348 | static int noop_enqueue(struct sk_buff *skb, struct Qdisc *qdisc) |
1da177e4 LT |
349 | { |
350 | kfree_skb(skb); | |
351 | return NET_XMIT_CN; | |
352 | } | |
353 | ||
82d567c2 | 354 | static struct sk_buff *noop_dequeue(struct Qdisc *qdisc) |
1da177e4 LT |
355 | { |
356 | return NULL; | |
357 | } | |
358 | ||
20fea08b | 359 | struct Qdisc_ops noop_qdisc_ops __read_mostly = { |
1da177e4 LT |
360 | .id = "noop", |
361 | .priv_size = 0, | |
362 | .enqueue = noop_enqueue, | |
363 | .dequeue = noop_dequeue, | |
99c0db26 | 364 | .peek = noop_dequeue, |
1da177e4 LT |
365 | .owner = THIS_MODULE, |
366 | }; | |
367 | ||
7698b4fc | 368 | static struct netdev_queue noop_netdev_queue = { |
7698b4fc | 369 | .qdisc = &noop_qdisc, |
9f3ffae0 | 370 | .qdisc_sleeping = &noop_qdisc, |
7698b4fc DM |
371 | }; |
372 | ||
1da177e4 LT |
373 | struct Qdisc noop_qdisc = { |
374 | .enqueue = noop_enqueue, | |
375 | .dequeue = noop_dequeue, | |
376 | .flags = TCQ_F_BUILTIN, | |
10297b99 | 377 | .ops = &noop_qdisc_ops, |
1da177e4 | 378 | .list = LIST_HEAD_INIT(noop_qdisc.list), |
83874000 | 379 | .q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock), |
7698b4fc | 380 | .dev_queue = &noop_netdev_queue, |
7b5edbc4 | 381 | .busylock = __SPIN_LOCK_UNLOCKED(noop_qdisc.busylock), |
1da177e4 | 382 | }; |
62e3ba1b | 383 | EXPORT_SYMBOL(noop_qdisc); |
1da177e4 | 384 | |
20fea08b | 385 | static struct Qdisc_ops noqueue_qdisc_ops __read_mostly = { |
1da177e4 LT |
386 | .id = "noqueue", |
387 | .priv_size = 0, | |
388 | .enqueue = noop_enqueue, | |
389 | .dequeue = noop_dequeue, | |
99c0db26 | 390 | .peek = noop_dequeue, |
1da177e4 LT |
391 | .owner = THIS_MODULE, |
392 | }; | |
393 | ||
30ee42be DM |
394 | static struct Qdisc noqueue_qdisc; |
395 | static struct netdev_queue noqueue_netdev_queue = { | |
396 | .qdisc = &noqueue_qdisc, | |
9f3ffae0 | 397 | .qdisc_sleeping = &noqueue_qdisc, |
30ee42be DM |
398 | }; |
399 | ||
1da177e4 LT |
400 | static struct Qdisc noqueue_qdisc = { |
401 | .enqueue = NULL, | |
402 | .dequeue = noop_dequeue, | |
403 | .flags = TCQ_F_BUILTIN, | |
404 | .ops = &noqueue_qdisc_ops, | |
405 | .list = LIST_HEAD_INIT(noqueue_qdisc.list), | |
30ee42be DM |
406 | .q.lock = __SPIN_LOCK_UNLOCKED(noqueue_qdisc.q.lock), |
407 | .dev_queue = &noqueue_netdev_queue, | |
7b5edbc4 | 408 | .busylock = __SPIN_LOCK_UNLOCKED(noqueue_qdisc.busylock), |
1da177e4 LT |
409 | }; |
410 | ||
411 | ||
cc7ec456 ED |
412 | static const u8 prio2band[TC_PRIO_MAX + 1] = { |
413 | 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 | |
414 | }; | |
d3678b46 DM |
415 | |
416 | /* 3-band FIFO queue: old style, but should be a bit faster than | |
417 | generic prio+fifo combination. | |
418 | */ | |
419 | ||
420 | #define PFIFO_FAST_BANDS 3 | |
421 | ||
fd3ae5e8 KK |
422 | /* |
423 | * Private data for a pfifo_fast scheduler containing: | |
424 | * - queues for the three band | |
425 | * - bitmap indicating which of the bands contain skbs | |
426 | */ | |
427 | struct pfifo_fast_priv { | |
428 | u32 bitmap; | |
429 | struct sk_buff_head q[PFIFO_FAST_BANDS]; | |
430 | }; | |
431 | ||
432 | /* | |
433 | * Convert a bitmap to the first band number where an skb is queued, where: | |
434 | * bitmap=0 means there are no skbs on any band. | |
435 | * bitmap=1 means there is an skb on band 0. | |
436 | * bitmap=7 means there are skbs on all 3 bands, etc. | |
437 | */ | |
438 | static const int bitmap2band[] = {-1, 0, 1, 0, 2, 0, 1, 0}; | |
439 | ||
440 | static inline struct sk_buff_head *band2list(struct pfifo_fast_priv *priv, | |
441 | int band) | |
d3678b46 | 442 | { |
fd3ae5e8 | 443 | return priv->q + band; |
d3678b46 DM |
444 | } |
445 | ||
cc7ec456 | 446 | static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc) |
321090e7 | 447 | { |
a453e068 KK |
448 | if (skb_queue_len(&qdisc->q) < qdisc_dev(qdisc)->tx_queue_len) { |
449 | int band = prio2band[skb->priority & TC_PRIO_MAX]; | |
450 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); | |
451 | struct sk_buff_head *list = band2list(priv, band); | |
1da177e4 | 452 | |
fd3ae5e8 | 453 | priv->bitmap |= (1 << band); |
d3678b46 | 454 | qdisc->q.qlen++; |
821d24ae | 455 | return __qdisc_enqueue_tail(skb, qdisc, list); |
d3678b46 | 456 | } |
821d24ae TG |
457 | |
458 | return qdisc_drop(skb, qdisc); | |
1da177e4 LT |
459 | } |
460 | ||
cc7ec456 | 461 | static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc) |
1da177e4 | 462 | { |
fd3ae5e8 KK |
463 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
464 | int band = bitmap2band[priv->bitmap]; | |
1da177e4 | 465 | |
fd3ae5e8 KK |
466 | if (likely(band >= 0)) { |
467 | struct sk_buff_head *list = band2list(priv, band); | |
468 | struct sk_buff *skb = __qdisc_dequeue_head(qdisc, list); | |
469 | ||
470 | qdisc->q.qlen--; | |
471 | if (skb_queue_empty(list)) | |
472 | priv->bitmap &= ~(1 << band); | |
473 | ||
474 | return skb; | |
d3678b46 | 475 | } |
f87a9c3d | 476 | |
1da177e4 LT |
477 | return NULL; |
478 | } | |
479 | ||
cc7ec456 | 480 | static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc) |
99c0db26 | 481 | { |
fd3ae5e8 KK |
482 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
483 | int band = bitmap2band[priv->bitmap]; | |
484 | ||
485 | if (band >= 0) { | |
486 | struct sk_buff_head *list = band2list(priv, band); | |
99c0db26 | 487 | |
fd3ae5e8 | 488 | return skb_peek(list); |
99c0db26 JP |
489 | } |
490 | ||
491 | return NULL; | |
492 | } | |
493 | ||
cc7ec456 | 494 | static void pfifo_fast_reset(struct Qdisc *qdisc) |
1da177e4 | 495 | { |
d3678b46 | 496 | int prio; |
fd3ae5e8 | 497 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
d3678b46 DM |
498 | |
499 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) | |
fd3ae5e8 | 500 | __qdisc_reset_queue(qdisc, band2list(priv, prio)); |
d3678b46 | 501 | |
fd3ae5e8 | 502 | priv->bitmap = 0; |
821d24ae | 503 | qdisc->qstats.backlog = 0; |
d3678b46 | 504 | qdisc->q.qlen = 0; |
1da177e4 LT |
505 | } |
506 | ||
d3678b46 DM |
507 | static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) |
508 | { | |
509 | struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; | |
510 | ||
cc7ec456 | 511 | memcpy(&opt.priomap, prio2band, TC_PRIO_MAX + 1); |
1b34ec43 DM |
512 | if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
513 | goto nla_put_failure; | |
d3678b46 DM |
514 | return skb->len; |
515 | ||
516 | nla_put_failure: | |
517 | return -1; | |
518 | } | |
519 | ||
520 | static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt) | |
521 | { | |
522 | int prio; | |
fd3ae5e8 | 523 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
d3678b46 DM |
524 | |
525 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) | |
fd3ae5e8 | 526 | skb_queue_head_init(band2list(priv, prio)); |
d3678b46 | 527 | |
23624935 ED |
528 | /* Can by-pass the queue discipline */ |
529 | qdisc->flags |= TCQ_F_CAN_BYPASS; | |
d3678b46 DM |
530 | return 0; |
531 | } | |
532 | ||
6ec1c69a | 533 | struct Qdisc_ops pfifo_fast_ops __read_mostly = { |
d3678b46 | 534 | .id = "pfifo_fast", |
fd3ae5e8 | 535 | .priv_size = sizeof(struct pfifo_fast_priv), |
d3678b46 DM |
536 | .enqueue = pfifo_fast_enqueue, |
537 | .dequeue = pfifo_fast_dequeue, | |
99c0db26 | 538 | .peek = pfifo_fast_peek, |
d3678b46 DM |
539 | .init = pfifo_fast_init, |
540 | .reset = pfifo_fast_reset, | |
541 | .dump = pfifo_fast_dump, | |
1da177e4 LT |
542 | .owner = THIS_MODULE, |
543 | }; | |
544 | ||
23d3b8bf ED |
545 | static struct lock_class_key qdisc_tx_busylock; |
546 | ||
5ce2d488 | 547 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d2a7f269 | 548 | const struct Qdisc_ops *ops) |
1da177e4 LT |
549 | { |
550 | void *p; | |
551 | struct Qdisc *sch; | |
d276055c | 552 | unsigned int size = QDISC_ALIGN(sizeof(*sch)) + ops->priv_size; |
3d54b82f | 553 | int err = -ENOBUFS; |
23d3b8bf | 554 | struct net_device *dev = dev_queue->dev; |
1da177e4 | 555 | |
f2cd2d3e ED |
556 | p = kzalloc_node(size, GFP_KERNEL, |
557 | netdev_queue_numa_node_read(dev_queue)); | |
558 | ||
1da177e4 | 559 | if (!p) |
3d54b82f | 560 | goto errout; |
3d54b82f | 561 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); |
d276055c ED |
562 | /* if we got non aligned memory, ask more and do alignment ourself */ |
563 | if (sch != p) { | |
564 | kfree(p); | |
565 | p = kzalloc_node(size + QDISC_ALIGNTO - 1, GFP_KERNEL, | |
566 | netdev_queue_numa_node_read(dev_queue)); | |
567 | if (!p) | |
568 | goto errout; | |
569 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); | |
570 | sch->padded = (char *) sch - (char *) p; | |
571 | } | |
1da177e4 LT |
572 | INIT_LIST_HEAD(&sch->list); |
573 | skb_queue_head_init(&sch->q); | |
23d3b8bf | 574 | |
79640a4c | 575 | spin_lock_init(&sch->busylock); |
23d3b8bf ED |
576 | lockdep_set_class(&sch->busylock, |
577 | dev->qdisc_tx_busylock ?: &qdisc_tx_busylock); | |
578 | ||
1da177e4 LT |
579 | sch->ops = ops; |
580 | sch->enqueue = ops->enqueue; | |
581 | sch->dequeue = ops->dequeue; | |
bb949fbd | 582 | sch->dev_queue = dev_queue; |
23d3b8bf | 583 | dev_hold(dev); |
1da177e4 | 584 | atomic_set(&sch->refcnt, 1); |
3d54b82f TG |
585 | |
586 | return sch; | |
587 | errout: | |
01e123d7 | 588 | return ERR_PTR(err); |
3d54b82f TG |
589 | } |
590 | ||
3511c913 | 591 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 592 | const struct Qdisc_ops *ops, |
593 | unsigned int parentid) | |
3d54b82f TG |
594 | { |
595 | struct Qdisc *sch; | |
10297b99 | 596 | |
6da7c8fc | 597 | if (!try_module_get(ops->owner)) |
598 | goto errout; | |
599 | ||
5ce2d488 | 600 | sch = qdisc_alloc(dev_queue, ops); |
3d54b82f TG |
601 | if (IS_ERR(sch)) |
602 | goto errout; | |
9f9afec4 | 603 | sch->parent = parentid; |
3d54b82f | 604 | |
1da177e4 LT |
605 | if (!ops->init || ops->init(sch, NULL) == 0) |
606 | return sch; | |
607 | ||
0fbbeb1b | 608 | qdisc_destroy(sch); |
3d54b82f | 609 | errout: |
1da177e4 LT |
610 | return NULL; |
611 | } | |
62e3ba1b | 612 | EXPORT_SYMBOL(qdisc_create_dflt); |
1da177e4 | 613 | |
5fb66229 | 614 | /* Under qdisc_lock(qdisc) and BH! */ |
1da177e4 LT |
615 | |
616 | void qdisc_reset(struct Qdisc *qdisc) | |
617 | { | |
20fea08b | 618 | const struct Qdisc_ops *ops = qdisc->ops; |
1da177e4 LT |
619 | |
620 | if (ops->reset) | |
621 | ops->reset(qdisc); | |
67305ebc | 622 | |
bbd8a0d3 KK |
623 | if (qdisc->gso_skb) { |
624 | kfree_skb(qdisc->gso_skb); | |
625 | qdisc->gso_skb = NULL; | |
626 | qdisc->q.qlen = 0; | |
627 | } | |
1da177e4 | 628 | } |
62e3ba1b | 629 | EXPORT_SYMBOL(qdisc_reset); |
1da177e4 | 630 | |
5d944c64 ED |
631 | static void qdisc_rcu_free(struct rcu_head *head) |
632 | { | |
633 | struct Qdisc *qdisc = container_of(head, struct Qdisc, rcu_head); | |
634 | ||
635 | kfree((char *) qdisc - qdisc->padded); | |
636 | } | |
637 | ||
1e0d5a57 | 638 | void qdisc_destroy(struct Qdisc *qdisc) |
1da177e4 | 639 | { |
8a34c5dc DM |
640 | const struct Qdisc_ops *ops = qdisc->ops; |
641 | ||
1e0d5a57 DM |
642 | if (qdisc->flags & TCQ_F_BUILTIN || |
643 | !atomic_dec_and_test(&qdisc->refcnt)) | |
644 | return; | |
645 | ||
3a682fbd | 646 | #ifdef CONFIG_NET_SCHED |
f6e0b239 JP |
647 | qdisc_list_del(qdisc); |
648 | ||
a2da570d | 649 | qdisc_put_stab(rtnl_dereference(qdisc->stab)); |
3a682fbd | 650 | #endif |
8a34c5dc DM |
651 | gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est); |
652 | if (ops->reset) | |
653 | ops->reset(qdisc); | |
654 | if (ops->destroy) | |
655 | ops->destroy(qdisc); | |
656 | ||
657 | module_put(ops->owner); | |
658 | dev_put(qdisc_dev(qdisc)); | |
659 | ||
554794de | 660 | kfree_skb(qdisc->gso_skb); |
5d944c64 ED |
661 | /* |
662 | * gen_estimator est_timer() might access qdisc->q.lock, | |
663 | * wait a RCU grace period before freeing qdisc. | |
664 | */ | |
665 | call_rcu(&qdisc->rcu_head, qdisc_rcu_free); | |
1da177e4 | 666 | } |
62e3ba1b | 667 | EXPORT_SYMBOL(qdisc_destroy); |
1da177e4 | 668 | |
589983cd PM |
669 | /* Attach toplevel qdisc to device queue. */ |
670 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
671 | struct Qdisc *qdisc) | |
672 | { | |
673 | struct Qdisc *oqdisc = dev_queue->qdisc_sleeping; | |
674 | spinlock_t *root_lock; | |
675 | ||
676 | root_lock = qdisc_lock(oqdisc); | |
677 | spin_lock_bh(root_lock); | |
678 | ||
679 | /* Prune old scheduler */ | |
680 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) | |
681 | qdisc_reset(oqdisc); | |
682 | ||
683 | /* ... and graft new one */ | |
684 | if (qdisc == NULL) | |
685 | qdisc = &noop_qdisc; | |
686 | dev_queue->qdisc_sleeping = qdisc; | |
687 | rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc); | |
688 | ||
689 | spin_unlock_bh(root_lock); | |
690 | ||
691 | return oqdisc; | |
692 | } | |
b8970f0b | 693 | EXPORT_SYMBOL(dev_graft_qdisc); |
589983cd | 694 | |
e8a0464c DM |
695 | static void attach_one_default_qdisc(struct net_device *dev, |
696 | struct netdev_queue *dev_queue, | |
697 | void *_unused) | |
698 | { | |
cc7ec456 | 699 | struct Qdisc *qdisc = &noqueue_qdisc; |
e8a0464c DM |
700 | |
701 | if (dev->tx_queue_len) { | |
3511c913 | 702 | qdisc = qdisc_create_dflt(dev_queue, |
6da7c8fc | 703 | default_qdisc_ops, TC_H_ROOT); |
e8a0464c | 704 | if (!qdisc) { |
cc7ec456 | 705 | netdev_info(dev, "activation failed\n"); |
e8a0464c DM |
706 | return; |
707 | } | |
1abbe139 ED |
708 | if (!netif_is_multiqueue(dev)) |
709 | qdisc->flags |= TCQ_F_ONETXQUEUE; | |
e8a0464c DM |
710 | } |
711 | dev_queue->qdisc_sleeping = qdisc; | |
712 | } | |
713 | ||
6ec1c69a DM |
714 | static void attach_default_qdiscs(struct net_device *dev) |
715 | { | |
716 | struct netdev_queue *txq; | |
717 | struct Qdisc *qdisc; | |
718 | ||
719 | txq = netdev_get_tx_queue(dev, 0); | |
720 | ||
721 | if (!netif_is_multiqueue(dev) || dev->tx_queue_len == 0) { | |
722 | netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL); | |
723 | dev->qdisc = txq->qdisc_sleeping; | |
724 | atomic_inc(&dev->qdisc->refcnt); | |
725 | } else { | |
3511c913 | 726 | qdisc = qdisc_create_dflt(txq, &mq_qdisc_ops, TC_H_ROOT); |
6ec1c69a | 727 | if (qdisc) { |
6ec1c69a | 728 | dev->qdisc = qdisc; |
e57a784d | 729 | qdisc->ops->attach(qdisc); |
6ec1c69a DM |
730 | } |
731 | } | |
732 | } | |
733 | ||
e8a0464c DM |
734 | static void transition_one_qdisc(struct net_device *dev, |
735 | struct netdev_queue *dev_queue, | |
736 | void *_need_watchdog) | |
737 | { | |
83874000 | 738 | struct Qdisc *new_qdisc = dev_queue->qdisc_sleeping; |
e8a0464c DM |
739 | int *need_watchdog_p = _need_watchdog; |
740 | ||
a9312ae8 DM |
741 | if (!(new_qdisc->flags & TCQ_F_BUILTIN)) |
742 | clear_bit(__QDISC_STATE_DEACTIVATED, &new_qdisc->state); | |
743 | ||
83874000 | 744 | rcu_assign_pointer(dev_queue->qdisc, new_qdisc); |
9d21493b ED |
745 | if (need_watchdog_p && new_qdisc != &noqueue_qdisc) { |
746 | dev_queue->trans_start = 0; | |
e8a0464c | 747 | *need_watchdog_p = 1; |
9d21493b | 748 | } |
e8a0464c DM |
749 | } |
750 | ||
1da177e4 LT |
751 | void dev_activate(struct net_device *dev) |
752 | { | |
e8a0464c | 753 | int need_watchdog; |
b0e1e646 | 754 | |
1da177e4 | 755 | /* No queueing discipline is attached to device; |
6da7c8fc | 756 | * create default one for devices, which need queueing |
757 | * and noqueue_qdisc for virtual interfaces | |
1da177e4 LT |
758 | */ |
759 | ||
6ec1c69a DM |
760 | if (dev->qdisc == &noop_qdisc) |
761 | attach_default_qdiscs(dev); | |
af356afa | 762 | |
cacaddf5 TC |
763 | if (!netif_carrier_ok(dev)) |
764 | /* Delay activation until next carrier-on event */ | |
765 | return; | |
766 | ||
e8a0464c DM |
767 | need_watchdog = 0; |
768 | netdev_for_each_tx_queue(dev, transition_one_qdisc, &need_watchdog); | |
24824a09 ED |
769 | if (dev_ingress_queue(dev)) |
770 | transition_one_qdisc(dev, dev_ingress_queue(dev), NULL); | |
e8a0464c DM |
771 | |
772 | if (need_watchdog) { | |
1da177e4 LT |
773 | dev->trans_start = jiffies; |
774 | dev_watchdog_up(dev); | |
775 | } | |
b0e1e646 | 776 | } |
b8970f0b | 777 | EXPORT_SYMBOL(dev_activate); |
b0e1e646 | 778 | |
e8a0464c DM |
779 | static void dev_deactivate_queue(struct net_device *dev, |
780 | struct netdev_queue *dev_queue, | |
781 | void *_qdisc_default) | |
b0e1e646 | 782 | { |
e8a0464c | 783 | struct Qdisc *qdisc_default = _qdisc_default; |
970565bb | 784 | struct Qdisc *qdisc; |
970565bb | 785 | |
970565bb | 786 | qdisc = dev_queue->qdisc; |
b0e1e646 | 787 | if (qdisc) { |
83874000 DM |
788 | spin_lock_bh(qdisc_lock(qdisc)); |
789 | ||
a9312ae8 DM |
790 | if (!(qdisc->flags & TCQ_F_BUILTIN)) |
791 | set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state); | |
792 | ||
f7a54c13 | 793 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
b0e1e646 | 794 | qdisc_reset(qdisc); |
d3b753db | 795 | |
83874000 | 796 | spin_unlock_bh(qdisc_lock(qdisc)); |
b0e1e646 | 797 | } |
1da177e4 LT |
798 | } |
799 | ||
4335cd2d | 800 | static bool some_qdisc_is_busy(struct net_device *dev) |
e8a0464c DM |
801 | { |
802 | unsigned int i; | |
803 | ||
804 | for (i = 0; i < dev->num_tx_queues; i++) { | |
805 | struct netdev_queue *dev_queue; | |
7698b4fc | 806 | spinlock_t *root_lock; |
e2627c8c | 807 | struct Qdisc *q; |
e8a0464c DM |
808 | int val; |
809 | ||
810 | dev_queue = netdev_get_tx_queue(dev, i); | |
b9a3b110 | 811 | q = dev_queue->qdisc_sleeping; |
5fb66229 | 812 | root_lock = qdisc_lock(q); |
e8a0464c | 813 | |
4335cd2d | 814 | spin_lock_bh(root_lock); |
e8a0464c | 815 | |
bc135b23 | 816 | val = (qdisc_is_running(q) || |
b9a3b110 | 817 | test_bit(__QDISC_STATE_SCHED, &q->state)); |
e8a0464c | 818 | |
4335cd2d | 819 | spin_unlock_bh(root_lock); |
e8a0464c DM |
820 | |
821 | if (val) | |
822 | return true; | |
823 | } | |
824 | return false; | |
825 | } | |
826 | ||
3137663d ED |
827 | /** |
828 | * dev_deactivate_many - deactivate transmissions on several devices | |
829 | * @head: list of devices to deactivate | |
830 | * | |
831 | * This function returns only when all outstanding transmissions | |
832 | * have completed, unless all devices are in dismantle phase. | |
833 | */ | |
44345724 | 834 | void dev_deactivate_many(struct list_head *head) |
1da177e4 | 835 | { |
44345724 | 836 | struct net_device *dev; |
3137663d | 837 | bool sync_needed = false; |
41a23b07 | 838 | |
5cde2829 | 839 | list_for_each_entry(dev, head, close_list) { |
44345724 OP |
840 | netdev_for_each_tx_queue(dev, dev_deactivate_queue, |
841 | &noop_qdisc); | |
842 | if (dev_ingress_queue(dev)) | |
843 | dev_deactivate_queue(dev, dev_ingress_queue(dev), | |
844 | &noop_qdisc); | |
845 | ||
846 | dev_watchdog_down(dev); | |
3137663d | 847 | sync_needed |= !dev->dismantle; |
44345724 | 848 | } |
1da177e4 | 849 | |
3137663d ED |
850 | /* Wait for outstanding qdisc-less dev_queue_xmit calls. |
851 | * This is avoided if all devices are in dismantle phase : | |
852 | * Caller will call synchronize_net() for us | |
853 | */ | |
854 | if (sync_needed) | |
855 | synchronize_net(); | |
1da177e4 | 856 | |
d4828d85 | 857 | /* Wait for outstanding qdisc_run calls. */ |
5cde2829 | 858 | list_for_each_entry(dev, head, close_list) |
44345724 OP |
859 | while (some_qdisc_is_busy(dev)) |
860 | yield(); | |
861 | } | |
862 | ||
863 | void dev_deactivate(struct net_device *dev) | |
864 | { | |
865 | LIST_HEAD(single); | |
866 | ||
5cde2829 | 867 | list_add(&dev->close_list, &single); |
44345724 | 868 | dev_deactivate_many(&single); |
5f04d506 | 869 | list_del(&single); |
1da177e4 | 870 | } |
b8970f0b | 871 | EXPORT_SYMBOL(dev_deactivate); |
1da177e4 | 872 | |
b0e1e646 DM |
873 | static void dev_init_scheduler_queue(struct net_device *dev, |
874 | struct netdev_queue *dev_queue, | |
e8a0464c | 875 | void *_qdisc) |
b0e1e646 | 876 | { |
e8a0464c DM |
877 | struct Qdisc *qdisc = _qdisc; |
878 | ||
b0e1e646 DM |
879 | dev_queue->qdisc = qdisc; |
880 | dev_queue->qdisc_sleeping = qdisc; | |
b0e1e646 DM |
881 | } |
882 | ||
1da177e4 LT |
883 | void dev_init_scheduler(struct net_device *dev) |
884 | { | |
af356afa | 885 | dev->qdisc = &noop_qdisc; |
e8a0464c | 886 | netdev_for_each_tx_queue(dev, dev_init_scheduler_queue, &noop_qdisc); |
24824a09 ED |
887 | if (dev_ingress_queue(dev)) |
888 | dev_init_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); | |
1da177e4 | 889 | |
b24b8a24 | 890 | setup_timer(&dev->watchdog_timer, dev_watchdog, (unsigned long)dev); |
1da177e4 LT |
891 | } |
892 | ||
e8a0464c DM |
893 | static void shutdown_scheduler_queue(struct net_device *dev, |
894 | struct netdev_queue *dev_queue, | |
895 | void *_qdisc_default) | |
1da177e4 | 896 | { |
b0e1e646 | 897 | struct Qdisc *qdisc = dev_queue->qdisc_sleeping; |
e8a0464c | 898 | struct Qdisc *qdisc_default = _qdisc_default; |
b0e1e646 DM |
899 | |
900 | if (qdisc) { | |
f7a54c13 | 901 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
b0e1e646 | 902 | dev_queue->qdisc_sleeping = qdisc_default; |
1da177e4 | 903 | |
1da177e4 | 904 | qdisc_destroy(qdisc); |
10297b99 | 905 | } |
b0e1e646 DM |
906 | } |
907 | ||
908 | void dev_shutdown(struct net_device *dev) | |
909 | { | |
e8a0464c | 910 | netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc); |
24824a09 ED |
911 | if (dev_ingress_queue(dev)) |
912 | shutdown_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); | |
af356afa PM |
913 | qdisc_destroy(dev->qdisc); |
914 | dev->qdisc = &noop_qdisc; | |
915 | ||
547b792c | 916 | WARN_ON(timer_pending(&dev->watchdog_timer)); |
1da177e4 | 917 | } |
292f1c7f | 918 | |
01cb71d2 | 919 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
920 | const struct tc_ratespec *conf, |
921 | u64 rate64) | |
292f1c7f | 922 | { |
01cb71d2 ED |
923 | memset(r, 0, sizeof(*r)); |
924 | r->overhead = conf->overhead; | |
3e1e3aae | 925 | r->rate_bytes_ps = max_t(u64, conf->rate, rate64); |
8a8e3d84 | 926 | r->linklayer = (conf->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
927 | r->mult = 1; |
928 | /* | |
130d3d68 ED |
929 | * The deal here is to replace a divide by a reciprocal one |
930 | * in fast path (a reciprocal divide is a multiply and a shift) | |
931 | * | |
932 | * Normal formula would be : | |
933 | * time_in_ns = (NSEC_PER_SEC * len) / rate_bps | |
934 | * | |
935 | * We compute mult/shift to use instead : | |
936 | * time_in_ns = (len * mult) >> shift; | |
937 | * | |
938 | * We try to get the highest possible mult value for accuracy, | |
939 | * but have to make sure no overflows will ever happen. | |
292f1c7f | 940 | */ |
130d3d68 ED |
941 | if (r->rate_bytes_ps > 0) { |
942 | u64 factor = NSEC_PER_SEC; | |
943 | ||
944 | for (;;) { | |
945 | r->mult = div64_u64(factor, r->rate_bytes_ps); | |
946 | if (r->mult & (1U << 31) || factor & (1ULL << 63)) | |
292f1c7f | 947 | break; |
130d3d68 ED |
948 | factor <<= 1; |
949 | r->shift++; | |
292f1c7f | 950 | } |
292f1c7f JP |
951 | } |
952 | } | |
953 | EXPORT_SYMBOL(psched_ratecfg_precompute); |