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> |
c5ad119f | 29 | #include <linux/skb_array.h> |
32d3e51a | 30 | #include <linux/if_macvlan.h> |
292f1c7f | 31 | #include <net/sch_generic.h> |
1da177e4 | 32 | #include <net/pkt_sched.h> |
7fee226a | 33 | #include <net/dst.h> |
e543002f | 34 | #include <trace/events/qdisc.h> |
f53c7239 | 35 | #include <net/xfrm.h> |
1da177e4 | 36 | |
34aedd3f | 37 | /* Qdisc to use by default */ |
38 | const struct Qdisc_ops *default_qdisc_ops = &pfifo_fast_ops; | |
39 | EXPORT_SYMBOL(default_qdisc_ops); | |
40 | ||
1da177e4 LT |
41 | /* Main transmission queue. */ |
42 | ||
0463d4ae | 43 | /* Modifications to data participating in scheduling must be protected with |
5fb66229 | 44 | * qdisc_lock(qdisc) spinlock. |
0463d4ae PM |
45 | * |
46 | * The idea is the following: | |
c7e4f3bb DM |
47 | * - enqueue, dequeue are serialized via qdisc root lock |
48 | * - ingress filtering is also serialized via qdisc root lock | |
0463d4ae | 49 | * - updates to tree and tree walking are only done under the rtnl mutex. |
1da177e4 | 50 | */ |
70e57d5e JF |
51 | |
52 | static inline struct sk_buff *__skb_dequeue_bad_txq(struct Qdisc *q) | |
53 | { | |
54 | const struct netdev_queue *txq = q->dev_queue; | |
55 | spinlock_t *lock = NULL; | |
56 | struct sk_buff *skb; | |
57 | ||
58 | if (q->flags & TCQ_F_NOLOCK) { | |
59 | lock = qdisc_lock(q); | |
60 | spin_lock(lock); | |
61 | } | |
62 | ||
63 | skb = skb_peek(&q->skb_bad_txq); | |
64 | if (skb) { | |
65 | /* check the reason of requeuing without tx lock first */ | |
66 | txq = skb_get_tx_queue(txq->dev, skb); | |
67 | if (!netif_xmit_frozen_or_stopped(txq)) { | |
68 | skb = __skb_dequeue(&q->skb_bad_txq); | |
69 | if (qdisc_is_percpu_stats(q)) { | |
70 | qdisc_qstats_cpu_backlog_dec(q, skb); | |
71 | qdisc_qstats_cpu_qlen_dec(q); | |
72 | } else { | |
73 | qdisc_qstats_backlog_dec(q, skb); | |
74 | q->q.qlen--; | |
75 | } | |
76 | } else { | |
77 | skb = NULL; | |
78 | } | |
79 | } | |
80 | ||
81 | if (lock) | |
82 | spin_unlock(lock); | |
83 | ||
84 | return skb; | |
85 | } | |
86 | ||
87 | static inline struct sk_buff *qdisc_dequeue_skb_bad_txq(struct Qdisc *q) | |
88 | { | |
89 | struct sk_buff *skb = skb_peek(&q->skb_bad_txq); | |
90 | ||
91 | if (unlikely(skb)) | |
92 | skb = __skb_dequeue_bad_txq(q); | |
93 | ||
94 | return skb; | |
95 | } | |
96 | ||
97 | static inline void qdisc_enqueue_skb_bad_txq(struct Qdisc *q, | |
98 | struct sk_buff *skb) | |
99 | { | |
100 | spinlock_t *lock = NULL; | |
101 | ||
102 | if (q->flags & TCQ_F_NOLOCK) { | |
103 | lock = qdisc_lock(q); | |
104 | spin_lock(lock); | |
105 | } | |
106 | ||
107 | __skb_queue_tail(&q->skb_bad_txq, skb); | |
108 | ||
109 | if (lock) | |
110 | spin_unlock(lock); | |
111 | } | |
112 | ||
a53851e2 | 113 | static inline int __dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q) |
c716a81a | 114 | { |
9540d977 WY |
115 | while (skb) { |
116 | struct sk_buff *next = skb->next; | |
117 | ||
118 | __skb_queue_tail(&q->gso_skb, skb); | |
119 | q->qstats.requeues++; | |
120 | qdisc_qstats_backlog_inc(q, skb); | |
121 | q->q.qlen++; /* it's still part of the queue */ | |
122 | ||
123 | skb = next; | |
124 | } | |
37437bb2 | 125 | __netif_schedule(q); |
6252352d | 126 | |
c716a81a JHS |
127 | return 0; |
128 | } | |
129 | ||
a53851e2 JF |
130 | static inline int dev_requeue_skb_locked(struct sk_buff *skb, struct Qdisc *q) |
131 | { | |
132 | spinlock_t *lock = qdisc_lock(q); | |
133 | ||
134 | spin_lock(lock); | |
9540d977 WY |
135 | while (skb) { |
136 | struct sk_buff *next = skb->next; | |
137 | ||
138 | __skb_queue_tail(&q->gso_skb, skb); | |
139 | ||
140 | qdisc_qstats_cpu_requeues_inc(q); | |
141 | qdisc_qstats_cpu_backlog_inc(q, skb); | |
142 | qdisc_qstats_cpu_qlen_inc(q); | |
143 | ||
144 | skb = next; | |
145 | } | |
a53851e2 JF |
146 | spin_unlock(lock); |
147 | ||
a53851e2 JF |
148 | __netif_schedule(q); |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static inline int dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q) | |
154 | { | |
155 | if (q->flags & TCQ_F_NOLOCK) | |
156 | return dev_requeue_skb_locked(skb, q); | |
157 | else | |
158 | return __dev_requeue_skb(skb, q); | |
159 | } | |
160 | ||
55a93b3e ED |
161 | static void try_bulk_dequeue_skb(struct Qdisc *q, |
162 | struct sk_buff *skb, | |
b8358d70 JDB |
163 | const struct netdev_queue *txq, |
164 | int *packets) | |
5772e9a3 | 165 | { |
55a93b3e | 166 | int bytelimit = qdisc_avail_bulklimit(txq) - skb->len; |
5772e9a3 JDB |
167 | |
168 | while (bytelimit > 0) { | |
55a93b3e | 169 | struct sk_buff *nskb = q->dequeue(q); |
5772e9a3 | 170 | |
55a93b3e | 171 | if (!nskb) |
5772e9a3 JDB |
172 | break; |
173 | ||
55a93b3e ED |
174 | bytelimit -= nskb->len; /* covers GSO len */ |
175 | skb->next = nskb; | |
176 | skb = nskb; | |
b8358d70 | 177 | (*packets)++; /* GSO counts as one pkt */ |
5772e9a3 | 178 | } |
55a93b3e | 179 | skb->next = NULL; |
5772e9a3 JDB |
180 | } |
181 | ||
4d202a0d ED |
182 | /* This variant of try_bulk_dequeue_skb() makes sure |
183 | * all skbs in the chain are for the same txq | |
184 | */ | |
185 | static void try_bulk_dequeue_skb_slow(struct Qdisc *q, | |
186 | struct sk_buff *skb, | |
187 | int *packets) | |
188 | { | |
189 | int mapping = skb_get_queue_mapping(skb); | |
190 | struct sk_buff *nskb; | |
191 | int cnt = 0; | |
192 | ||
193 | do { | |
194 | nskb = q->dequeue(q); | |
195 | if (!nskb) | |
196 | break; | |
197 | if (unlikely(skb_get_queue_mapping(nskb) != mapping)) { | |
70e57d5e JF |
198 | qdisc_enqueue_skb_bad_txq(q, nskb); |
199 | ||
200 | if (qdisc_is_percpu_stats(q)) { | |
201 | qdisc_qstats_cpu_backlog_inc(q, nskb); | |
202 | qdisc_qstats_cpu_qlen_inc(q); | |
203 | } else { | |
204 | qdisc_qstats_backlog_inc(q, nskb); | |
205 | q->q.qlen++; | |
206 | } | |
4d202a0d ED |
207 | break; |
208 | } | |
209 | skb->next = nskb; | |
210 | skb = nskb; | |
211 | } while (++cnt < 8); | |
212 | (*packets) += cnt; | |
213 | skb->next = NULL; | |
214 | } | |
215 | ||
5772e9a3 JDB |
216 | /* Note that dequeue_skb can possibly return a SKB list (via skb->next). |
217 | * A requeued skb (via q->gso_skb) can also be a SKB list. | |
218 | */ | |
b8358d70 JDB |
219 | static struct sk_buff *dequeue_skb(struct Qdisc *q, bool *validate, |
220 | int *packets) | |
c716a81a | 221 | { |
1abbe139 | 222 | const struct netdev_queue *txq = q->dev_queue; |
fd8e8d1a | 223 | struct sk_buff *skb = NULL; |
554794de | 224 | |
b8358d70 | 225 | *packets = 1; |
a53851e2 JF |
226 | if (unlikely(!skb_queue_empty(&q->gso_skb))) { |
227 | spinlock_t *lock = NULL; | |
228 | ||
229 | if (q->flags & TCQ_F_NOLOCK) { | |
230 | lock = qdisc_lock(q); | |
231 | spin_lock(lock); | |
232 | } | |
233 | ||
234 | skb = skb_peek(&q->gso_skb); | |
235 | ||
236 | /* skb may be null if another cpu pulls gso_skb off in between | |
237 | * empty check and lock. | |
238 | */ | |
239 | if (!skb) { | |
240 | if (lock) | |
241 | spin_unlock(lock); | |
242 | goto validate; | |
243 | } | |
244 | ||
4d202a0d ED |
245 | /* skb in gso_skb were already validated */ |
246 | *validate = false; | |
f53c7239 SK |
247 | if (xfrm_offload(skb)) |
248 | *validate = true; | |
ebf05982 | 249 | /* check the reason of requeuing without tx lock first */ |
10c51b56 | 250 | txq = skb_get_tx_queue(txq->dev, skb); |
73466498 | 251 | if (!netif_xmit_frozen_or_stopped(txq)) { |
a53851e2 JF |
252 | skb = __skb_dequeue(&q->gso_skb); |
253 | if (qdisc_is_percpu_stats(q)) { | |
254 | qdisc_qstats_cpu_backlog_dec(q, skb); | |
255 | qdisc_qstats_cpu_qlen_dec(q); | |
256 | } else { | |
257 | qdisc_qstats_backlog_dec(q, skb); | |
258 | q->q.qlen--; | |
259 | } | |
260 | } else { | |
ebf05982 | 261 | skb = NULL; |
a53851e2 JF |
262 | } |
263 | if (lock) | |
264 | spin_unlock(lock); | |
e543002f | 265 | goto trace; |
4d202a0d | 266 | } |
a53851e2 | 267 | validate: |
4d202a0d | 268 | *validate = true; |
fd8e8d1a JF |
269 | |
270 | if ((q->flags & TCQ_F_ONETXQUEUE) && | |
271 | netif_xmit_frozen_or_stopped(txq)) | |
272 | return skb; | |
273 | ||
70e57d5e JF |
274 | skb = qdisc_dequeue_skb_bad_txq(q); |
275 | if (unlikely(skb)) | |
276 | goto bulk; | |
fd8e8d1a | 277 | skb = q->dequeue(q); |
4d202a0d ED |
278 | if (skb) { |
279 | bulk: | |
280 | if (qdisc_may_bulk(q)) | |
281 | try_bulk_dequeue_skb(q, skb, txq, packets); | |
282 | else | |
283 | try_bulk_dequeue_skb_slow(q, skb, packets); | |
ebf05982 | 284 | } |
e543002f JDB |
285 | trace: |
286 | trace_qdisc_dequeue(q, txq, *packets, skb); | |
c716a81a JHS |
287 | return skb; |
288 | } | |
289 | ||
10297b99 | 290 | /* |
10770bc2 | 291 | * Transmit possibly several skbs, and handle the return status as |
f9eb8aea | 292 | * required. Owning running seqcount bit guarantees that |
10770bc2 | 293 | * only one CPU can execute this function. |
6c1361a6 KK |
294 | * |
295 | * Returns to the caller: | |
29b86cda JF |
296 | * false - hardware queue frozen backoff |
297 | * true - feel free to send more pkts | |
6c1361a6 | 298 | */ |
29b86cda JF |
299 | bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, |
300 | struct net_device *dev, struct netdev_queue *txq, | |
301 | spinlock_t *root_lock, bool validate) | |
1da177e4 | 302 | { |
5f1a485d | 303 | int ret = NETDEV_TX_BUSY; |
f53c7239 | 304 | bool again = false; |
7698b4fc DM |
305 | |
306 | /* And release qdisc */ | |
6b3ba914 JF |
307 | if (root_lock) |
308 | spin_unlock(root_lock); | |
c716a81a | 309 | |
55a93b3e ED |
310 | /* Note that we validate skb (GSO, checksum, ...) outside of locks */ |
311 | if (validate) | |
f53c7239 SK |
312 | skb = validate_xmit_skb_list(skb, dev, &again); |
313 | ||
314 | #ifdef CONFIG_XFRM_OFFLOAD | |
315 | if (unlikely(again)) { | |
316 | if (root_lock) | |
317 | spin_lock(root_lock); | |
318 | ||
319 | dev_requeue_skb(skb, q); | |
320 | return false; | |
321 | } | |
322 | #endif | |
572a9d7b | 323 | |
3dcd493f | 324 | if (likely(skb)) { |
55a93b3e ED |
325 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
326 | if (!netif_xmit_frozen_or_stopped(txq)) | |
327 | skb = dev_hard_start_xmit(skb, dev, txq, &ret); | |
c716a81a | 328 | |
55a93b3e | 329 | HARD_TX_UNLOCK(dev, txq); |
3dcd493f | 330 | } else { |
6b3ba914 JF |
331 | if (root_lock) |
332 | spin_lock(root_lock); | |
29b86cda | 333 | return true; |
55a93b3e | 334 | } |
6b3ba914 JF |
335 | |
336 | if (root_lock) | |
337 | spin_lock(root_lock); | |
c716a81a | 338 | |
29b86cda | 339 | if (!dev_xmit_complete(ret)) { |
6c1361a6 | 340 | /* Driver returned NETDEV_TX_BUSY - requeue skb */ |
e87cc472 JP |
341 | if (unlikely(ret != NETDEV_TX_BUSY)) |
342 | net_warn_ratelimited("BUG %s code %d qlen %d\n", | |
343 | dev->name, ret, q->q.qlen); | |
6c1361a6 | 344 | |
29b86cda JF |
345 | dev_requeue_skb(skb, q); |
346 | return false; | |
6c1361a6 | 347 | } |
c716a81a | 348 | |
73466498 | 349 | if (ret && netif_xmit_frozen_or_stopped(txq)) |
29b86cda | 350 | return false; |
37437bb2 | 351 | |
29b86cda | 352 | return true; |
1da177e4 LT |
353 | } |
354 | ||
bbd8a0d3 KK |
355 | /* |
356 | * NOTE: Called under qdisc_lock(q) with locally disabled BH. | |
357 | * | |
f9eb8aea | 358 | * running seqcount guarantees only one CPU can process |
bbd8a0d3 KK |
359 | * this qdisc at a time. qdisc_lock(q) serializes queue accesses for |
360 | * this queue. | |
361 | * | |
362 | * netif_tx_lock serializes accesses to device driver. | |
363 | * | |
364 | * qdisc_lock(q) and netif_tx_lock are mutually exclusive, | |
365 | * if one is grabbed, another must be free. | |
366 | * | |
367 | * Note, that this procedure can be called by a watchdog timer | |
368 | * | |
369 | * Returns to the caller: | |
370 | * 0 - queue is empty or throttled. | |
371 | * >0 - queue is not empty. | |
372 | * | |
373 | */ | |
29b86cda | 374 | static inline bool qdisc_restart(struct Qdisc *q, int *packets) |
bbd8a0d3 | 375 | { |
6b3ba914 | 376 | spinlock_t *root_lock = NULL; |
bbd8a0d3 KK |
377 | struct netdev_queue *txq; |
378 | struct net_device *dev; | |
bbd8a0d3 | 379 | struct sk_buff *skb; |
55a93b3e | 380 | bool validate; |
bbd8a0d3 KK |
381 | |
382 | /* Dequeue packet */ | |
b8358d70 | 383 | skb = dequeue_skb(q, &validate, packets); |
bbd8a0d3 | 384 | if (unlikely(!skb)) |
29b86cda | 385 | return false; |
10c51b56 | 386 | |
6b3ba914 JF |
387 | if (!(q->flags & TCQ_F_NOLOCK)) |
388 | root_lock = qdisc_lock(q); | |
389 | ||
bbd8a0d3 | 390 | dev = qdisc_dev(q); |
10c51b56 | 391 | txq = skb_get_tx_queue(dev, skb); |
bbd8a0d3 | 392 | |
55a93b3e | 393 | return sch_direct_xmit(skb, q, dev, txq, root_lock, validate); |
bbd8a0d3 KK |
394 | } |
395 | ||
37437bb2 | 396 | void __qdisc_run(struct Qdisc *q) |
48d83325 | 397 | { |
3d48b53f | 398 | int quota = dev_tx_weight; |
b8358d70 | 399 | int packets; |
2ba2506c | 400 | |
b8358d70 | 401 | while (qdisc_restart(q, &packets)) { |
2ba2506c | 402 | /* |
d5b8aa1d | 403 | * Ordered by possible occurrence: Postpone processing if |
404 | * 1. we've exceeded packet quota | |
405 | * 2. another process needs the CPU; | |
2ba2506c | 406 | */ |
b8358d70 JDB |
407 | quota -= packets; |
408 | if (quota <= 0 || need_resched()) { | |
37437bb2 | 409 | __netif_schedule(q); |
d90df3ad | 410 | break; |
2ba2506c HX |
411 | } |
412 | } | |
48d83325 HX |
413 | } |
414 | ||
9d21493b ED |
415 | unsigned long dev_trans_start(struct net_device *dev) |
416 | { | |
07ce76aa | 417 | unsigned long val, res; |
9d21493b ED |
418 | unsigned int i; |
419 | ||
07ce76aa | 420 | if (is_vlan_dev(dev)) |
421 | dev = vlan_dev_real_dev(dev); | |
32d3e51a CD |
422 | else if (netif_is_macvlan(dev)) |
423 | dev = macvlan_dev_real_dev(dev); | |
9b36627a FW |
424 | res = netdev_get_tx_queue(dev, 0)->trans_start; |
425 | for (i = 1; i < dev->num_tx_queues; i++) { | |
9d21493b ED |
426 | val = netdev_get_tx_queue(dev, i)->trans_start; |
427 | if (val && time_after(val, res)) | |
428 | res = val; | |
429 | } | |
07ce76aa | 430 | |
9d21493b ED |
431 | return res; |
432 | } | |
433 | EXPORT_SYMBOL(dev_trans_start); | |
434 | ||
cdeabbb8 | 435 | static void dev_watchdog(struct timer_list *t) |
1da177e4 | 436 | { |
cdeabbb8 | 437 | struct net_device *dev = from_timer(dev, t, watchdog_timer); |
1da177e4 | 438 | |
932ff279 | 439 | netif_tx_lock(dev); |
e8a0464c | 440 | if (!qdisc_tx_is_noop(dev)) { |
1da177e4 LT |
441 | if (netif_device_present(dev) && |
442 | netif_running(dev) && | |
443 | netif_carrier_ok(dev)) { | |
9d21493b | 444 | int some_queue_timedout = 0; |
e8a0464c | 445 | unsigned int i; |
9d21493b | 446 | unsigned long trans_start; |
e8a0464c DM |
447 | |
448 | for (i = 0; i < dev->num_tx_queues; i++) { | |
449 | struct netdev_queue *txq; | |
450 | ||
451 | txq = netdev_get_tx_queue(dev, i); | |
9b36627a | 452 | trans_start = txq->trans_start; |
73466498 | 453 | if (netif_xmit_stopped(txq) && |
9d21493b ED |
454 | time_after(jiffies, (trans_start + |
455 | dev->watchdog_timeo))) { | |
456 | some_queue_timedout = 1; | |
ccf5ff69 | 457 | txq->trans_timeout++; |
e8a0464c DM |
458 | break; |
459 | } | |
460 | } | |
338f7566 | 461 | |
9d21493b | 462 | if (some_queue_timedout) { |
9d21493b | 463 | WARN_ONCE(1, KERN_INFO "NETDEV WATCHDOG: %s (%s): transmit queue %u timed out\n", |
3019de12 | 464 | dev->name, netdev_drivername(dev), i); |
d314774c | 465 | dev->netdev_ops->ndo_tx_timeout(dev); |
1da177e4 | 466 | } |
e8a0464c DM |
467 | if (!mod_timer(&dev->watchdog_timer, |
468 | round_jiffies(jiffies + | |
469 | dev->watchdog_timeo))) | |
1da177e4 LT |
470 | dev_hold(dev); |
471 | } | |
472 | } | |
932ff279 | 473 | netif_tx_unlock(dev); |
1da177e4 LT |
474 | |
475 | dev_put(dev); | |
476 | } | |
477 | ||
1da177e4 LT |
478 | void __netdev_watchdog_up(struct net_device *dev) |
479 | { | |
d314774c | 480 | if (dev->netdev_ops->ndo_tx_timeout) { |
1da177e4 LT |
481 | if (dev->watchdog_timeo <= 0) |
482 | dev->watchdog_timeo = 5*HZ; | |
60468d5b VP |
483 | if (!mod_timer(&dev->watchdog_timer, |
484 | round_jiffies(jiffies + dev->watchdog_timeo))) | |
1da177e4 LT |
485 | dev_hold(dev); |
486 | } | |
487 | } | |
488 | ||
489 | static void dev_watchdog_up(struct net_device *dev) | |
490 | { | |
1da177e4 | 491 | __netdev_watchdog_up(dev); |
1da177e4 LT |
492 | } |
493 | ||
494 | static void dev_watchdog_down(struct net_device *dev) | |
495 | { | |
932ff279 | 496 | netif_tx_lock_bh(dev); |
1da177e4 | 497 | if (del_timer(&dev->watchdog_timer)) |
15333061 | 498 | dev_put(dev); |
932ff279 | 499 | netif_tx_unlock_bh(dev); |
1da177e4 LT |
500 | } |
501 | ||
bea3348e SH |
502 | /** |
503 | * netif_carrier_on - set carrier | |
504 | * @dev: network device | |
505 | * | |
506 | * Device has detected that carrier. | |
507 | */ | |
0a242efc DV |
508 | void netif_carrier_on(struct net_device *dev) |
509 | { | |
bfaae0f0 | 510 | if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
b4730016 DM |
511 | if (dev->reg_state == NETREG_UNINITIALIZED) |
512 | return; | |
2d3b479d | 513 | atomic_inc(&dev->carrier_changes); |
0a242efc | 514 | linkwatch_fire_event(dev); |
bfaae0f0 JG |
515 | if (netif_running(dev)) |
516 | __netdev_watchdog_up(dev); | |
517 | } | |
0a242efc | 518 | } |
62e3ba1b | 519 | EXPORT_SYMBOL(netif_carrier_on); |
0a242efc | 520 | |
bea3348e SH |
521 | /** |
522 | * netif_carrier_off - clear carrier | |
523 | * @dev: network device | |
524 | * | |
525 | * Device has detected loss of carrier. | |
526 | */ | |
0a242efc DV |
527 | void netif_carrier_off(struct net_device *dev) |
528 | { | |
b4730016 DM |
529 | if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
530 | if (dev->reg_state == NETREG_UNINITIALIZED) | |
531 | return; | |
2d3b479d | 532 | atomic_inc(&dev->carrier_changes); |
0a242efc | 533 | linkwatch_fire_event(dev); |
b4730016 | 534 | } |
0a242efc | 535 | } |
62e3ba1b | 536 | EXPORT_SYMBOL(netif_carrier_off); |
0a242efc | 537 | |
1da177e4 LT |
538 | /* "NOOP" scheduler: the best scheduler, recommended for all interfaces |
539 | under all circumstances. It is difficult to invent anything faster or | |
540 | cheaper. | |
541 | */ | |
542 | ||
520ac30f ED |
543 | static int noop_enqueue(struct sk_buff *skb, struct Qdisc *qdisc, |
544 | struct sk_buff **to_free) | |
1da177e4 | 545 | { |
520ac30f | 546 | __qdisc_drop(skb, to_free); |
1da177e4 LT |
547 | return NET_XMIT_CN; |
548 | } | |
549 | ||
82d567c2 | 550 | static struct sk_buff *noop_dequeue(struct Qdisc *qdisc) |
1da177e4 LT |
551 | { |
552 | return NULL; | |
553 | } | |
554 | ||
20fea08b | 555 | struct Qdisc_ops noop_qdisc_ops __read_mostly = { |
1da177e4 LT |
556 | .id = "noop", |
557 | .priv_size = 0, | |
558 | .enqueue = noop_enqueue, | |
559 | .dequeue = noop_dequeue, | |
99c0db26 | 560 | .peek = noop_dequeue, |
1da177e4 LT |
561 | .owner = THIS_MODULE, |
562 | }; | |
563 | ||
7698b4fc | 564 | static struct netdev_queue noop_netdev_queue = { |
7698b4fc | 565 | .qdisc = &noop_qdisc, |
9f3ffae0 | 566 | .qdisc_sleeping = &noop_qdisc, |
7698b4fc DM |
567 | }; |
568 | ||
1da177e4 LT |
569 | struct Qdisc noop_qdisc = { |
570 | .enqueue = noop_enqueue, | |
571 | .dequeue = noop_dequeue, | |
572 | .flags = TCQ_F_BUILTIN, | |
10297b99 | 573 | .ops = &noop_qdisc_ops, |
83874000 | 574 | .q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock), |
7698b4fc | 575 | .dev_queue = &noop_netdev_queue, |
f9eb8aea | 576 | .running = SEQCNT_ZERO(noop_qdisc.running), |
7b5edbc4 | 577 | .busylock = __SPIN_LOCK_UNLOCKED(noop_qdisc.busylock), |
1da177e4 | 578 | }; |
62e3ba1b | 579 | EXPORT_SYMBOL(noop_qdisc); |
1da177e4 | 580 | |
e63d7dfd AA |
581 | static int noqueue_init(struct Qdisc *qdisc, struct nlattr *opt, |
582 | struct netlink_ext_ack *extack) | |
d66d6c31 PS |
583 | { |
584 | /* register_qdisc() assigns a default of noop_enqueue if unset, | |
585 | * but __dev_queue_xmit() treats noqueue only as such | |
586 | * if this is NULL - so clear it here. */ | |
587 | qdisc->enqueue = NULL; | |
588 | return 0; | |
589 | } | |
590 | ||
591 | struct Qdisc_ops noqueue_qdisc_ops __read_mostly = { | |
1da177e4 LT |
592 | .id = "noqueue", |
593 | .priv_size = 0, | |
d66d6c31 | 594 | .init = noqueue_init, |
1da177e4 LT |
595 | .enqueue = noop_enqueue, |
596 | .dequeue = noop_dequeue, | |
99c0db26 | 597 | .peek = noop_dequeue, |
1da177e4 LT |
598 | .owner = THIS_MODULE, |
599 | }; | |
600 | ||
cc7ec456 ED |
601 | static const u8 prio2band[TC_PRIO_MAX + 1] = { |
602 | 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 | |
603 | }; | |
d3678b46 DM |
604 | |
605 | /* 3-band FIFO queue: old style, but should be a bit faster than | |
606 | generic prio+fifo combination. | |
607 | */ | |
608 | ||
609 | #define PFIFO_FAST_BANDS 3 | |
610 | ||
fd3ae5e8 KK |
611 | /* |
612 | * Private data for a pfifo_fast scheduler containing: | |
c5ad119f | 613 | * - rings for priority bands |
fd3ae5e8 KK |
614 | */ |
615 | struct pfifo_fast_priv { | |
c5ad119f | 616 | struct skb_array q[PFIFO_FAST_BANDS]; |
fd3ae5e8 KK |
617 | }; |
618 | ||
c5ad119f JF |
619 | static inline struct skb_array *band2list(struct pfifo_fast_priv *priv, |
620 | int band) | |
d3678b46 | 621 | { |
c5ad119f | 622 | return &priv->q[band]; |
d3678b46 DM |
623 | } |
624 | ||
520ac30f ED |
625 | static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc, |
626 | struct sk_buff **to_free) | |
321090e7 | 627 | { |
c5ad119f JF |
628 | int band = prio2band[skb->priority & TC_PRIO_MAX]; |
629 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); | |
630 | struct skb_array *q = band2list(priv, band); | |
631 | int err; | |
821d24ae | 632 | |
c5ad119f JF |
633 | err = skb_array_produce(q, skb); |
634 | ||
635 | if (unlikely(err)) | |
636 | return qdisc_drop_cpu(skb, qdisc, to_free); | |
637 | ||
638 | qdisc_qstats_cpu_qlen_inc(qdisc); | |
639 | qdisc_qstats_cpu_backlog_inc(qdisc, skb); | |
640 | return NET_XMIT_SUCCESS; | |
1da177e4 LT |
641 | } |
642 | ||
cc7ec456 | 643 | static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc) |
1da177e4 | 644 | { |
fd3ae5e8 | 645 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
c5ad119f JF |
646 | struct sk_buff *skb = NULL; |
647 | int band; | |
ec323368 | 648 | |
c5ad119f JF |
649 | for (band = 0; band < PFIFO_FAST_BANDS && !skb; band++) { |
650 | struct skb_array *q = band2list(priv, band); | |
fd3ae5e8 | 651 | |
c5ad119f JF |
652 | if (__skb_array_empty(q)) |
653 | continue; | |
fd3ae5e8 | 654 | |
c5ad119f JF |
655 | skb = skb_array_consume_bh(q); |
656 | } | |
657 | if (likely(skb)) { | |
658 | qdisc_qstats_cpu_backlog_dec(qdisc, skb); | |
659 | qdisc_bstats_cpu_update(qdisc, skb); | |
660 | qdisc_qstats_cpu_qlen_dec(qdisc); | |
d3678b46 | 661 | } |
f87a9c3d | 662 | |
c5ad119f | 663 | return skb; |
1da177e4 LT |
664 | } |
665 | ||
cc7ec456 | 666 | static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc) |
99c0db26 | 667 | { |
fd3ae5e8 | 668 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
c5ad119f JF |
669 | struct sk_buff *skb = NULL; |
670 | int band; | |
fd3ae5e8 | 671 | |
c5ad119f JF |
672 | for (band = 0; band < PFIFO_FAST_BANDS && !skb; band++) { |
673 | struct skb_array *q = band2list(priv, band); | |
99c0db26 | 674 | |
c5ad119f | 675 | skb = __skb_array_peek(q); |
99c0db26 JP |
676 | } |
677 | ||
c5ad119f | 678 | return skb; |
99c0db26 JP |
679 | } |
680 | ||
cc7ec456 | 681 | static void pfifo_fast_reset(struct Qdisc *qdisc) |
1da177e4 | 682 | { |
c5ad119f | 683 | int i, band; |
fd3ae5e8 | 684 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
d3678b46 | 685 | |
c5ad119f JF |
686 | for (band = 0; band < PFIFO_FAST_BANDS; band++) { |
687 | struct skb_array *q = band2list(priv, band); | |
688 | struct sk_buff *skb; | |
d3678b46 | 689 | |
1df94c3c CW |
690 | /* NULL ring is possible if destroy path is due to a failed |
691 | * skb_array_init() in pfifo_fast_init() case. | |
692 | */ | |
693 | if (!q->ring.queue) | |
694 | continue; | |
695 | ||
c5ad119f JF |
696 | while ((skb = skb_array_consume_bh(q)) != NULL) |
697 | kfree_skb(skb); | |
698 | } | |
699 | ||
700 | for_each_possible_cpu(i) { | |
701 | struct gnet_stats_queue *q = per_cpu_ptr(qdisc->cpu_qstats, i); | |
702 | ||
703 | q->backlog = 0; | |
704 | q->qlen = 0; | |
705 | } | |
1da177e4 LT |
706 | } |
707 | ||
d3678b46 DM |
708 | static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) |
709 | { | |
710 | struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; | |
711 | ||
cc7ec456 | 712 | memcpy(&opt.priomap, prio2band, TC_PRIO_MAX + 1); |
1b34ec43 DM |
713 | if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
714 | goto nla_put_failure; | |
d3678b46 DM |
715 | return skb->len; |
716 | ||
717 | nla_put_failure: | |
718 | return -1; | |
719 | } | |
720 | ||
e63d7dfd AA |
721 | static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt, |
722 | struct netlink_ext_ack *extack) | |
d3678b46 | 723 | { |
c5ad119f | 724 | unsigned int qlen = qdisc_dev(qdisc)->tx_queue_len; |
fd3ae5e8 | 725 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
c5ad119f JF |
726 | int prio; |
727 | ||
728 | /* guard against zero length rings */ | |
729 | if (!qlen) | |
730 | return -EINVAL; | |
d3678b46 | 731 | |
c5ad119f JF |
732 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) { |
733 | struct skb_array *q = band2list(priv, prio); | |
734 | int err; | |
735 | ||
736 | err = skb_array_init(q, qlen, GFP_KERNEL); | |
737 | if (err) | |
738 | return -ENOMEM; | |
739 | } | |
d3678b46 | 740 | |
23624935 ED |
741 | /* Can by-pass the queue discipline */ |
742 | qdisc->flags |= TCQ_F_CAN_BYPASS; | |
d3678b46 DM |
743 | return 0; |
744 | } | |
745 | ||
c5ad119f JF |
746 | static void pfifo_fast_destroy(struct Qdisc *sch) |
747 | { | |
748 | struct pfifo_fast_priv *priv = qdisc_priv(sch); | |
749 | int prio; | |
750 | ||
751 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) { | |
752 | struct skb_array *q = band2list(priv, prio); | |
753 | ||
754 | /* NULL ring is possible if destroy path is due to a failed | |
755 | * skb_array_init() in pfifo_fast_init() case. | |
756 | */ | |
1df94c3c | 757 | if (!q->ring.queue) |
c5ad119f JF |
758 | continue; |
759 | /* Destroy ring but no need to kfree_skb because a call to | |
760 | * pfifo_fast_reset() has already done that work. | |
761 | */ | |
762 | ptr_ring_cleanup(&q->ring, NULL); | |
763 | } | |
764 | } | |
765 | ||
6ec1c69a | 766 | struct Qdisc_ops pfifo_fast_ops __read_mostly = { |
d3678b46 | 767 | .id = "pfifo_fast", |
fd3ae5e8 | 768 | .priv_size = sizeof(struct pfifo_fast_priv), |
d3678b46 DM |
769 | .enqueue = pfifo_fast_enqueue, |
770 | .dequeue = pfifo_fast_dequeue, | |
99c0db26 | 771 | .peek = pfifo_fast_peek, |
d3678b46 | 772 | .init = pfifo_fast_init, |
c5ad119f | 773 | .destroy = pfifo_fast_destroy, |
d3678b46 DM |
774 | .reset = pfifo_fast_reset, |
775 | .dump = pfifo_fast_dump, | |
1da177e4 | 776 | .owner = THIS_MODULE, |
c5ad119f | 777 | .static_flags = TCQ_F_NOLOCK | TCQ_F_CPUSTATS, |
1da177e4 | 778 | }; |
1f27cde3 | 779 | EXPORT_SYMBOL(pfifo_fast_ops); |
1da177e4 | 780 | |
23d3b8bf | 781 | static struct lock_class_key qdisc_tx_busylock; |
f9eb8aea | 782 | static struct lock_class_key qdisc_running_key; |
23d3b8bf | 783 | |
5ce2d488 | 784 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d0bd684d AA |
785 | const struct Qdisc_ops *ops, |
786 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
787 | { |
788 | void *p; | |
789 | struct Qdisc *sch; | |
d276055c | 790 | unsigned int size = QDISC_ALIGN(sizeof(*sch)) + ops->priv_size; |
3d54b82f | 791 | int err = -ENOBUFS; |
26aa0459 JSP |
792 | struct net_device *dev; |
793 | ||
794 | if (!dev_queue) { | |
d0bd684d | 795 | NL_SET_ERR_MSG(extack, "No device queue given"); |
26aa0459 JSP |
796 | err = -EINVAL; |
797 | goto errout; | |
798 | } | |
1da177e4 | 799 | |
26aa0459 | 800 | dev = dev_queue->dev; |
f2cd2d3e ED |
801 | p = kzalloc_node(size, GFP_KERNEL, |
802 | netdev_queue_numa_node_read(dev_queue)); | |
803 | ||
1da177e4 | 804 | if (!p) |
3d54b82f | 805 | goto errout; |
3d54b82f | 806 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); |
d276055c ED |
807 | /* if we got non aligned memory, ask more and do alignment ourself */ |
808 | if (sch != p) { | |
809 | kfree(p); | |
810 | p = kzalloc_node(size + QDISC_ALIGNTO - 1, GFP_KERNEL, | |
811 | netdev_queue_numa_node_read(dev_queue)); | |
812 | if (!p) | |
813 | goto errout; | |
814 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); | |
815 | sch->padded = (char *) sch - (char *) p; | |
816 | } | |
a53851e2 | 817 | __skb_queue_head_init(&sch->gso_skb); |
70e57d5e | 818 | __skb_queue_head_init(&sch->skb_bad_txq); |
48da34b7 FW |
819 | qdisc_skb_head_init(&sch->q); |
820 | spin_lock_init(&sch->q.lock); | |
23d3b8bf | 821 | |
d59f5ffa JF |
822 | if (ops->static_flags & TCQ_F_CPUSTATS) { |
823 | sch->cpu_bstats = | |
824 | netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); | |
825 | if (!sch->cpu_bstats) | |
826 | goto errout1; | |
827 | ||
828 | sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); | |
829 | if (!sch->cpu_qstats) { | |
830 | free_percpu(sch->cpu_bstats); | |
831 | goto errout1; | |
832 | } | |
833 | } | |
834 | ||
79640a4c | 835 | spin_lock_init(&sch->busylock); |
23d3b8bf ED |
836 | lockdep_set_class(&sch->busylock, |
837 | dev->qdisc_tx_busylock ?: &qdisc_tx_busylock); | |
838 | ||
f9eb8aea ED |
839 | seqcount_init(&sch->running); |
840 | lockdep_set_class(&sch->running, | |
841 | dev->qdisc_running_key ?: &qdisc_running_key); | |
842 | ||
1da177e4 | 843 | sch->ops = ops; |
d59f5ffa | 844 | sch->flags = ops->static_flags; |
1da177e4 LT |
845 | sch->enqueue = ops->enqueue; |
846 | sch->dequeue = ops->dequeue; | |
bb949fbd | 847 | sch->dev_queue = dev_queue; |
23d3b8bf | 848 | dev_hold(dev); |
7b936405 | 849 | refcount_set(&sch->refcnt, 1); |
3d54b82f TG |
850 | |
851 | return sch; | |
d59f5ffa JF |
852 | errout1: |
853 | kfree(p); | |
3d54b82f | 854 | errout: |
01e123d7 | 855 | return ERR_PTR(err); |
3d54b82f TG |
856 | } |
857 | ||
3511c913 | 858 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 859 | const struct Qdisc_ops *ops, |
a38a9882 AA |
860 | unsigned int parentid, |
861 | struct netlink_ext_ack *extack) | |
3d54b82f TG |
862 | { |
863 | struct Qdisc *sch; | |
10297b99 | 864 | |
a38a9882 AA |
865 | if (!try_module_get(ops->owner)) { |
866 | NL_SET_ERR_MSG(extack, "Failed to increase module reference counter"); | |
166ee5b8 | 867 | return NULL; |
a38a9882 | 868 | } |
6da7c8fc | 869 | |
a38a9882 | 870 | sch = qdisc_alloc(dev_queue, ops, extack); |
166ee5b8 ED |
871 | if (IS_ERR(sch)) { |
872 | module_put(ops->owner); | |
873 | return NULL; | |
874 | } | |
9f9afec4 | 875 | sch->parent = parentid; |
3d54b82f | 876 | |
a38a9882 | 877 | if (!ops->init || ops->init(sch, NULL, extack) == 0) |
1da177e4 LT |
878 | return sch; |
879 | ||
0fbbeb1b | 880 | qdisc_destroy(sch); |
1da177e4 LT |
881 | return NULL; |
882 | } | |
62e3ba1b | 883 | EXPORT_SYMBOL(qdisc_create_dflt); |
1da177e4 | 884 | |
5fb66229 | 885 | /* Under qdisc_lock(qdisc) and BH! */ |
1da177e4 LT |
886 | |
887 | void qdisc_reset(struct Qdisc *qdisc) | |
888 | { | |
20fea08b | 889 | const struct Qdisc_ops *ops = qdisc->ops; |
a53851e2 | 890 | struct sk_buff *skb, *tmp; |
1da177e4 LT |
891 | |
892 | if (ops->reset) | |
893 | ops->reset(qdisc); | |
67305ebc | 894 | |
a53851e2 JF |
895 | skb_queue_walk_safe(&qdisc->gso_skb, skb, tmp) { |
896 | __skb_unlink(skb, &qdisc->gso_skb); | |
897 | kfree_skb_list(skb); | |
bbd8a0d3 | 898 | } |
a53851e2 | 899 | |
70e57d5e JF |
900 | skb_queue_walk_safe(&qdisc->skb_bad_txq, skb, tmp) { |
901 | __skb_unlink(skb, &qdisc->skb_bad_txq); | |
902 | kfree_skb_list(skb); | |
903 | } | |
904 | ||
4d202a0d | 905 | qdisc->q.qlen = 0; |
c8e18129 | 906 | qdisc->qstats.backlog = 0; |
1da177e4 | 907 | } |
62e3ba1b | 908 | EXPORT_SYMBOL(qdisc_reset); |
1da177e4 | 909 | |
81d947e2 | 910 | void qdisc_free(struct Qdisc *qdisc) |
5d944c64 | 911 | { |
73c20a8b | 912 | if (qdisc_is_percpu_stats(qdisc)) { |
22e0f8b9 | 913 | free_percpu(qdisc->cpu_bstats); |
73c20a8b JF |
914 | free_percpu(qdisc->cpu_qstats); |
915 | } | |
22e0f8b9 | 916 | |
5d944c64 ED |
917 | kfree((char *) qdisc - qdisc->padded); |
918 | } | |
919 | ||
1e0d5a57 | 920 | void qdisc_destroy(struct Qdisc *qdisc) |
1da177e4 | 921 | { |
8a34c5dc | 922 | const struct Qdisc_ops *ops = qdisc->ops; |
a53851e2 | 923 | struct sk_buff *skb, *tmp; |
8a34c5dc | 924 | |
1e0d5a57 | 925 | if (qdisc->flags & TCQ_F_BUILTIN || |
7b936405 | 926 | !refcount_dec_and_test(&qdisc->refcnt)) |
1e0d5a57 DM |
927 | return; |
928 | ||
3a682fbd | 929 | #ifdef CONFIG_NET_SCHED |
59cc1f61 | 930 | qdisc_hash_del(qdisc); |
f6e0b239 | 931 | |
a2da570d | 932 | qdisc_put_stab(rtnl_dereference(qdisc->stab)); |
3a682fbd | 933 | #endif |
1c0d32fd | 934 | gen_kill_estimator(&qdisc->rate_est); |
8a34c5dc DM |
935 | if (ops->reset) |
936 | ops->reset(qdisc); | |
937 | if (ops->destroy) | |
938 | ops->destroy(qdisc); | |
939 | ||
940 | module_put(ops->owner); | |
941 | dev_put(qdisc_dev(qdisc)); | |
942 | ||
a53851e2 JF |
943 | skb_queue_walk_safe(&qdisc->gso_skb, skb, tmp) { |
944 | __skb_unlink(skb, &qdisc->gso_skb); | |
945 | kfree_skb_list(skb); | |
946 | } | |
947 | ||
70e57d5e JF |
948 | skb_queue_walk_safe(&qdisc->skb_bad_txq, skb, tmp) { |
949 | __skb_unlink(skb, &qdisc->skb_bad_txq); | |
950 | kfree_skb_list(skb); | |
951 | } | |
952 | ||
752fbcc3 | 953 | qdisc_free(qdisc); |
1da177e4 | 954 | } |
62e3ba1b | 955 | EXPORT_SYMBOL(qdisc_destroy); |
1da177e4 | 956 | |
589983cd PM |
957 | /* Attach toplevel qdisc to device queue. */ |
958 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
959 | struct Qdisc *qdisc) | |
960 | { | |
961 | struct Qdisc *oqdisc = dev_queue->qdisc_sleeping; | |
962 | spinlock_t *root_lock; | |
963 | ||
964 | root_lock = qdisc_lock(oqdisc); | |
965 | spin_lock_bh(root_lock); | |
966 | ||
589983cd PM |
967 | /* ... and graft new one */ |
968 | if (qdisc == NULL) | |
969 | qdisc = &noop_qdisc; | |
970 | dev_queue->qdisc_sleeping = qdisc; | |
971 | rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc); | |
972 | ||
973 | spin_unlock_bh(root_lock); | |
974 | ||
975 | return oqdisc; | |
976 | } | |
b8970f0b | 977 | EXPORT_SYMBOL(dev_graft_qdisc); |
589983cd | 978 | |
e8a0464c DM |
979 | static void attach_one_default_qdisc(struct net_device *dev, |
980 | struct netdev_queue *dev_queue, | |
981 | void *_unused) | |
982 | { | |
3e692f21 PS |
983 | struct Qdisc *qdisc; |
984 | const struct Qdisc_ops *ops = default_qdisc_ops; | |
e8a0464c | 985 | |
3e692f21 PS |
986 | if (dev->priv_flags & IFF_NO_QUEUE) |
987 | ops = &noqueue_qdisc_ops; | |
988 | ||
a38a9882 | 989 | qdisc = qdisc_create_dflt(dev_queue, ops, TC_H_ROOT, NULL); |
3e692f21 PS |
990 | if (!qdisc) { |
991 | netdev_info(dev, "activation failed\n"); | |
992 | return; | |
e8a0464c | 993 | } |
3e692f21 | 994 | if (!netif_is_multiqueue(dev)) |
4eaf3b84 | 995 | qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; |
e8a0464c DM |
996 | dev_queue->qdisc_sleeping = qdisc; |
997 | } | |
998 | ||
6ec1c69a DM |
999 | static void attach_default_qdiscs(struct net_device *dev) |
1000 | { | |
1001 | struct netdev_queue *txq; | |
1002 | struct Qdisc *qdisc; | |
1003 | ||
1004 | txq = netdev_get_tx_queue(dev, 0); | |
1005 | ||
4b469955 | 1006 | if (!netif_is_multiqueue(dev) || |
4b469955 | 1007 | dev->priv_flags & IFF_NO_QUEUE) { |
6ec1c69a DM |
1008 | netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL); |
1009 | dev->qdisc = txq->qdisc_sleeping; | |
551143d8 | 1010 | qdisc_refcount_inc(dev->qdisc); |
6ec1c69a | 1011 | } else { |
a38a9882 | 1012 | qdisc = qdisc_create_dflt(txq, &mq_qdisc_ops, TC_H_ROOT, NULL); |
6ec1c69a | 1013 | if (qdisc) { |
6ec1c69a | 1014 | dev->qdisc = qdisc; |
e57a784d | 1015 | qdisc->ops->attach(qdisc); |
6ec1c69a DM |
1016 | } |
1017 | } | |
59cc1f61 | 1018 | #ifdef CONFIG_NET_SCHED |
92f91706 | 1019 | if (dev->qdisc != &noop_qdisc) |
49b49971 | 1020 | qdisc_hash_add(dev->qdisc, false); |
59cc1f61 | 1021 | #endif |
6ec1c69a DM |
1022 | } |
1023 | ||
e8a0464c DM |
1024 | static void transition_one_qdisc(struct net_device *dev, |
1025 | struct netdev_queue *dev_queue, | |
1026 | void *_need_watchdog) | |
1027 | { | |
83874000 | 1028 | struct Qdisc *new_qdisc = dev_queue->qdisc_sleeping; |
e8a0464c DM |
1029 | int *need_watchdog_p = _need_watchdog; |
1030 | ||
a9312ae8 DM |
1031 | if (!(new_qdisc->flags & TCQ_F_BUILTIN)) |
1032 | clear_bit(__QDISC_STATE_DEACTIVATED, &new_qdisc->state); | |
1033 | ||
83874000 | 1034 | rcu_assign_pointer(dev_queue->qdisc, new_qdisc); |
3e692f21 | 1035 | if (need_watchdog_p) { |
9d21493b | 1036 | dev_queue->trans_start = 0; |
e8a0464c | 1037 | *need_watchdog_p = 1; |
9d21493b | 1038 | } |
e8a0464c DM |
1039 | } |
1040 | ||
1da177e4 LT |
1041 | void dev_activate(struct net_device *dev) |
1042 | { | |
e8a0464c | 1043 | int need_watchdog; |
b0e1e646 | 1044 | |
1da177e4 | 1045 | /* No queueing discipline is attached to device; |
6da7c8fc | 1046 | * create default one for devices, which need queueing |
1047 | * and noqueue_qdisc for virtual interfaces | |
1da177e4 LT |
1048 | */ |
1049 | ||
6ec1c69a DM |
1050 | if (dev->qdisc == &noop_qdisc) |
1051 | attach_default_qdiscs(dev); | |
af356afa | 1052 | |
cacaddf5 TC |
1053 | if (!netif_carrier_ok(dev)) |
1054 | /* Delay activation until next carrier-on event */ | |
1055 | return; | |
1056 | ||
e8a0464c DM |
1057 | need_watchdog = 0; |
1058 | netdev_for_each_tx_queue(dev, transition_one_qdisc, &need_watchdog); | |
24824a09 ED |
1059 | if (dev_ingress_queue(dev)) |
1060 | transition_one_qdisc(dev, dev_ingress_queue(dev), NULL); | |
e8a0464c DM |
1061 | |
1062 | if (need_watchdog) { | |
860e9538 | 1063 | netif_trans_update(dev); |
1da177e4 LT |
1064 | dev_watchdog_up(dev); |
1065 | } | |
b0e1e646 | 1066 | } |
b8970f0b | 1067 | EXPORT_SYMBOL(dev_activate); |
b0e1e646 | 1068 | |
e8a0464c DM |
1069 | static void dev_deactivate_queue(struct net_device *dev, |
1070 | struct netdev_queue *dev_queue, | |
1071 | void *_qdisc_default) | |
b0e1e646 | 1072 | { |
e8a0464c | 1073 | struct Qdisc *qdisc_default = _qdisc_default; |
970565bb | 1074 | struct Qdisc *qdisc; |
970565bb | 1075 | |
46e5da40 | 1076 | qdisc = rtnl_dereference(dev_queue->qdisc); |
b0e1e646 | 1077 | if (qdisc) { |
83874000 DM |
1078 | spin_lock_bh(qdisc_lock(qdisc)); |
1079 | ||
a9312ae8 DM |
1080 | if (!(qdisc->flags & TCQ_F_BUILTIN)) |
1081 | set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state); | |
1082 | ||
f7a54c13 | 1083 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
b0e1e646 | 1084 | qdisc_reset(qdisc); |
d3b753db | 1085 | |
83874000 | 1086 | spin_unlock_bh(qdisc_lock(qdisc)); |
b0e1e646 | 1087 | } |
1da177e4 LT |
1088 | } |
1089 | ||
4335cd2d | 1090 | static bool some_qdisc_is_busy(struct net_device *dev) |
e8a0464c DM |
1091 | { |
1092 | unsigned int i; | |
1093 | ||
1094 | for (i = 0; i < dev->num_tx_queues; i++) { | |
1095 | struct netdev_queue *dev_queue; | |
7698b4fc | 1096 | spinlock_t *root_lock; |
e2627c8c | 1097 | struct Qdisc *q; |
e8a0464c DM |
1098 | int val; |
1099 | ||
1100 | dev_queue = netdev_get_tx_queue(dev, i); | |
b9a3b110 | 1101 | q = dev_queue->qdisc_sleeping; |
e8a0464c | 1102 | |
6b3ba914 JF |
1103 | if (q->flags & TCQ_F_NOLOCK) { |
1104 | val = test_bit(__QDISC_STATE_SCHED, &q->state); | |
1105 | } else { | |
1106 | root_lock = qdisc_lock(q); | |
1107 | spin_lock_bh(root_lock); | |
e8a0464c | 1108 | |
6b3ba914 JF |
1109 | val = (qdisc_is_running(q) || |
1110 | test_bit(__QDISC_STATE_SCHED, &q->state)); | |
e8a0464c | 1111 | |
6b3ba914 JF |
1112 | spin_unlock_bh(root_lock); |
1113 | } | |
e8a0464c DM |
1114 | |
1115 | if (val) | |
1116 | return true; | |
1117 | } | |
1118 | return false; | |
1119 | } | |
1120 | ||
7bbde83b JF |
1121 | static void dev_qdisc_reset(struct net_device *dev, |
1122 | struct netdev_queue *dev_queue, | |
1123 | void *none) | |
1124 | { | |
1125 | struct Qdisc *qdisc = dev_queue->qdisc_sleeping; | |
1126 | ||
1127 | if (qdisc) | |
1128 | qdisc_reset(qdisc); | |
1129 | } | |
1130 | ||
3137663d ED |
1131 | /** |
1132 | * dev_deactivate_many - deactivate transmissions on several devices | |
1133 | * @head: list of devices to deactivate | |
1134 | * | |
1135 | * This function returns only when all outstanding transmissions | |
1136 | * have completed, unless all devices are in dismantle phase. | |
1137 | */ | |
44345724 | 1138 | void dev_deactivate_many(struct list_head *head) |
1da177e4 | 1139 | { |
44345724 | 1140 | struct net_device *dev; |
41a23b07 | 1141 | |
5cde2829 | 1142 | list_for_each_entry(dev, head, close_list) { |
44345724 OP |
1143 | netdev_for_each_tx_queue(dev, dev_deactivate_queue, |
1144 | &noop_qdisc); | |
1145 | if (dev_ingress_queue(dev)) | |
1146 | dev_deactivate_queue(dev, dev_ingress_queue(dev), | |
1147 | &noop_qdisc); | |
1148 | ||
1149 | dev_watchdog_down(dev); | |
1150 | } | |
1da177e4 | 1151 | |
3137663d ED |
1152 | /* Wait for outstanding qdisc-less dev_queue_xmit calls. |
1153 | * This is avoided if all devices are in dismantle phase : | |
1154 | * Caller will call synchronize_net() for us | |
1155 | */ | |
7bbde83b | 1156 | synchronize_net(); |
1da177e4 | 1157 | |
d4828d85 | 1158 | /* Wait for outstanding qdisc_run calls. */ |
7bbde83b | 1159 | list_for_each_entry(dev, head, close_list) { |
44345724 OP |
1160 | while (some_qdisc_is_busy(dev)) |
1161 | yield(); | |
7bbde83b JF |
1162 | /* The new qdisc is assigned at this point so we can safely |
1163 | * unwind stale skb lists and qdisc statistics | |
1164 | */ | |
1165 | netdev_for_each_tx_queue(dev, dev_qdisc_reset, NULL); | |
1166 | if (dev_ingress_queue(dev)) | |
1167 | dev_qdisc_reset(dev, dev_ingress_queue(dev), NULL); | |
1168 | } | |
44345724 OP |
1169 | } |
1170 | ||
1171 | void dev_deactivate(struct net_device *dev) | |
1172 | { | |
1173 | LIST_HEAD(single); | |
1174 | ||
5cde2829 | 1175 | list_add(&dev->close_list, &single); |
44345724 | 1176 | dev_deactivate_many(&single); |
5f04d506 | 1177 | list_del(&single); |
1da177e4 | 1178 | } |
b8970f0b | 1179 | EXPORT_SYMBOL(dev_deactivate); |
1da177e4 | 1180 | |
b0e1e646 DM |
1181 | static void dev_init_scheduler_queue(struct net_device *dev, |
1182 | struct netdev_queue *dev_queue, | |
e8a0464c | 1183 | void *_qdisc) |
b0e1e646 | 1184 | { |
e8a0464c DM |
1185 | struct Qdisc *qdisc = _qdisc; |
1186 | ||
46e5da40 | 1187 | rcu_assign_pointer(dev_queue->qdisc, qdisc); |
b0e1e646 | 1188 | dev_queue->qdisc_sleeping = qdisc; |
a53851e2 | 1189 | __skb_queue_head_init(&qdisc->gso_skb); |
70e57d5e | 1190 | __skb_queue_head_init(&qdisc->skb_bad_txq); |
b0e1e646 DM |
1191 | } |
1192 | ||
1da177e4 LT |
1193 | void dev_init_scheduler(struct net_device *dev) |
1194 | { | |
af356afa | 1195 | dev->qdisc = &noop_qdisc; |
e8a0464c | 1196 | netdev_for_each_tx_queue(dev, dev_init_scheduler_queue, &noop_qdisc); |
24824a09 ED |
1197 | if (dev_ingress_queue(dev)) |
1198 | dev_init_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); | |
1da177e4 | 1199 | |
cdeabbb8 | 1200 | timer_setup(&dev->watchdog_timer, dev_watchdog, 0); |
1da177e4 LT |
1201 | } |
1202 | ||
e8a0464c DM |
1203 | static void shutdown_scheduler_queue(struct net_device *dev, |
1204 | struct netdev_queue *dev_queue, | |
1205 | void *_qdisc_default) | |
1da177e4 | 1206 | { |
b0e1e646 | 1207 | struct Qdisc *qdisc = dev_queue->qdisc_sleeping; |
e8a0464c | 1208 | struct Qdisc *qdisc_default = _qdisc_default; |
b0e1e646 DM |
1209 | |
1210 | if (qdisc) { | |
f7a54c13 | 1211 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
b0e1e646 | 1212 | dev_queue->qdisc_sleeping = qdisc_default; |
1da177e4 | 1213 | |
1da177e4 | 1214 | qdisc_destroy(qdisc); |
10297b99 | 1215 | } |
b0e1e646 DM |
1216 | } |
1217 | ||
1218 | void dev_shutdown(struct net_device *dev) | |
1219 | { | |
e8a0464c | 1220 | netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc); |
24824a09 ED |
1221 | if (dev_ingress_queue(dev)) |
1222 | shutdown_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); | |
af356afa PM |
1223 | qdisc_destroy(dev->qdisc); |
1224 | dev->qdisc = &noop_qdisc; | |
1225 | ||
547b792c | 1226 | WARN_ON(timer_pending(&dev->watchdog_timer)); |
1da177e4 | 1227 | } |
292f1c7f | 1228 | |
01cb71d2 | 1229 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
1230 | const struct tc_ratespec *conf, |
1231 | u64 rate64) | |
292f1c7f | 1232 | { |
01cb71d2 ED |
1233 | memset(r, 0, sizeof(*r)); |
1234 | r->overhead = conf->overhead; | |
3e1e3aae | 1235 | r->rate_bytes_ps = max_t(u64, conf->rate, rate64); |
8a8e3d84 | 1236 | r->linklayer = (conf->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
1237 | r->mult = 1; |
1238 | /* | |
130d3d68 ED |
1239 | * The deal here is to replace a divide by a reciprocal one |
1240 | * in fast path (a reciprocal divide is a multiply and a shift) | |
1241 | * | |
1242 | * Normal formula would be : | |
1243 | * time_in_ns = (NSEC_PER_SEC * len) / rate_bps | |
1244 | * | |
1245 | * We compute mult/shift to use instead : | |
1246 | * time_in_ns = (len * mult) >> shift; | |
1247 | * | |
1248 | * We try to get the highest possible mult value for accuracy, | |
1249 | * but have to make sure no overflows will ever happen. | |
292f1c7f | 1250 | */ |
130d3d68 ED |
1251 | if (r->rate_bytes_ps > 0) { |
1252 | u64 factor = NSEC_PER_SEC; | |
1253 | ||
1254 | for (;;) { | |
1255 | r->mult = div64_u64(factor, r->rate_bytes_ps); | |
1256 | if (r->mult & (1U << 31) || factor & (1ULL << 63)) | |
292f1c7f | 1257 | break; |
130d3d68 ED |
1258 | factor <<= 1; |
1259 | r->shift++; | |
292f1c7f | 1260 | } |
292f1c7f JP |
1261 | } |
1262 | } | |
1263 | EXPORT_SYMBOL(psched_ratecfg_precompute); | |
46209401 JP |
1264 | |
1265 | static void mini_qdisc_rcu_func(struct rcu_head *head) | |
1266 | { | |
1267 | } | |
1268 | ||
1269 | void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, | |
1270 | struct tcf_proto *tp_head) | |
1271 | { | |
1272 | struct mini_Qdisc *miniq_old = rtnl_dereference(*miniqp->p_miniq); | |
1273 | struct mini_Qdisc *miniq; | |
1274 | ||
1275 | if (!tp_head) { | |
1276 | RCU_INIT_POINTER(*miniqp->p_miniq, NULL); | |
b2fb01f4 CW |
1277 | /* Wait for flying RCU callback before it is freed. */ |
1278 | rcu_barrier_bh(); | |
46209401 JP |
1279 | return; |
1280 | } | |
1281 | ||
1282 | miniq = !miniq_old || miniq_old == &miniqp->miniq2 ? | |
1283 | &miniqp->miniq1 : &miniqp->miniq2; | |
1284 | ||
1285 | /* We need to make sure that readers won't see the miniq | |
1286 | * we are about to modify. So wait until previous call_rcu_bh callback | |
1287 | * is done. | |
1288 | */ | |
1289 | rcu_barrier_bh(); | |
1290 | miniq->filter_list = tp_head; | |
1291 | rcu_assign_pointer(*miniqp->p_miniq, miniq); | |
1292 | ||
1293 | if (miniq_old) | |
b2fb01f4 | 1294 | /* This is counterpart of the rcu barriers above. We need to |
46209401 JP |
1295 | * block potential new user of miniq_old until all readers |
1296 | * are not seeing it. | |
1297 | */ | |
1298 | call_rcu_bh(&miniq_old->rcu, mini_qdisc_rcu_func); | |
1299 | } | |
1300 | EXPORT_SYMBOL(mini_qdisc_pair_swap); | |
1301 | ||
1302 | void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, | |
1303 | struct mini_Qdisc __rcu **p_miniq) | |
1304 | { | |
1305 | miniqp->miniq1.cpu_bstats = qdisc->cpu_bstats; | |
1306 | miniqp->miniq1.cpu_qstats = qdisc->cpu_qstats; | |
1307 | miniqp->miniq2.cpu_bstats = qdisc->cpu_bstats; | |
1308 | miniqp->miniq2.cpu_qstats = qdisc->cpu_qstats; | |
1309 | miniqp->p_miniq = p_miniq; | |
1310 | } | |
1311 | EXPORT_SYMBOL(mini_qdisc_pair_init); |