Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * net/sched/sch_generic.c Generic packet scheduler routines. | |
4 | * | |
1da177e4 LT |
5 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
6 | * Jamal Hadi Salim, <hadi@cyberus.ca> 990601 | |
7 | * - Ingress support | |
8 | */ | |
9 | ||
1da177e4 | 10 | #include <linux/bitops.h> |
1da177e4 LT |
11 | #include <linux/module.h> |
12 | #include <linux/types.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/string.h> | |
1da177e4 | 16 | #include <linux/errno.h> |
1da177e4 LT |
17 | #include <linux/netdevice.h> |
18 | #include <linux/skbuff.h> | |
19 | #include <linux/rtnetlink.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/rcupdate.h> | |
22 | #include <linux/list.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
07ce76aa | 24 | #include <linux/if_vlan.h> |
c5ad119f | 25 | #include <linux/skb_array.h> |
32d3e51a | 26 | #include <linux/if_macvlan.h> |
292f1c7f | 27 | #include <net/sch_generic.h> |
1da177e4 | 28 | #include <net/pkt_sched.h> |
7fee226a | 29 | #include <net/dst.h> |
e543002f | 30 | #include <trace/events/qdisc.h> |
141b6b2a | 31 | #include <trace/events/net.h> |
f53c7239 | 32 | #include <net/xfrm.h> |
1da177e4 | 33 | |
34aedd3f | 34 | /* Qdisc to use by default */ |
35 | const struct Qdisc_ops *default_qdisc_ops = &pfifo_fast_ops; | |
36 | EXPORT_SYMBOL(default_qdisc_ops); | |
37 | ||
dcad9ee9 YL |
38 | static void qdisc_maybe_clear_missed(struct Qdisc *q, |
39 | const struct netdev_queue *txq) | |
40 | { | |
41 | clear_bit(__QDISC_STATE_MISSED, &q->state); | |
42 | ||
43 | /* Make sure the below netif_xmit_frozen_or_stopped() | |
44 | * checking happens after clearing STATE_MISSED. | |
45 | */ | |
46 | smp_mb__after_atomic(); | |
47 | ||
48 | /* Checking netif_xmit_frozen_or_stopped() again to | |
49 | * make sure STATE_MISSED is set if the STATE_MISSED | |
50 | * set by netif_tx_wake_queue()'s rescheduling of | |
51 | * net_tx_action() is cleared by the above clear_bit(). | |
52 | */ | |
53 | if (!netif_xmit_frozen_or_stopped(txq)) | |
54 | set_bit(__QDISC_STATE_MISSED, &q->state); | |
c4fef01b YL |
55 | else |
56 | set_bit(__QDISC_STATE_DRAINING, &q->state); | |
dcad9ee9 YL |
57 | } |
58 | ||
1da177e4 LT |
59 | /* Main transmission queue. */ |
60 | ||
0463d4ae | 61 | /* Modifications to data participating in scheduling must be protected with |
5fb66229 | 62 | * qdisc_lock(qdisc) spinlock. |
0463d4ae PM |
63 | * |
64 | * The idea is the following: | |
c7e4f3bb DM |
65 | * - enqueue, dequeue are serialized via qdisc root lock |
66 | * - ingress filtering is also serialized via qdisc root lock | |
0463d4ae | 67 | * - updates to tree and tree walking are only done under the rtnl mutex. |
1da177e4 | 68 | */ |
70e57d5e | 69 | |
b88dd52c ED |
70 | #define SKB_XOFF_MAGIC ((struct sk_buff *)1UL) |
71 | ||
70e57d5e JF |
72 | static inline struct sk_buff *__skb_dequeue_bad_txq(struct Qdisc *q) |
73 | { | |
74 | const struct netdev_queue *txq = q->dev_queue; | |
75 | spinlock_t *lock = NULL; | |
76 | struct sk_buff *skb; | |
77 | ||
78 | if (q->flags & TCQ_F_NOLOCK) { | |
79 | lock = qdisc_lock(q); | |
80 | spin_lock(lock); | |
81 | } | |
82 | ||
83 | skb = skb_peek(&q->skb_bad_txq); | |
84 | if (skb) { | |
85 | /* check the reason of requeuing without tx lock first */ | |
86 | txq = skb_get_tx_queue(txq->dev, skb); | |
87 | if (!netif_xmit_frozen_or_stopped(txq)) { | |
88 | skb = __skb_dequeue(&q->skb_bad_txq); | |
89 | if (qdisc_is_percpu_stats(q)) { | |
90 | qdisc_qstats_cpu_backlog_dec(q, skb); | |
73eb628d | 91 | qdisc_qstats_cpu_qlen_dec(q); |
70e57d5e JF |
92 | } else { |
93 | qdisc_qstats_backlog_dec(q, skb); | |
94 | q->q.qlen--; | |
95 | } | |
96 | } else { | |
b88dd52c | 97 | skb = SKB_XOFF_MAGIC; |
dcad9ee9 | 98 | qdisc_maybe_clear_missed(q, txq); |
70e57d5e JF |
99 | } |
100 | } | |
101 | ||
102 | if (lock) | |
103 | spin_unlock(lock); | |
104 | ||
105 | return skb; | |
106 | } | |
107 | ||
108 | static inline struct sk_buff *qdisc_dequeue_skb_bad_txq(struct Qdisc *q) | |
109 | { | |
110 | struct sk_buff *skb = skb_peek(&q->skb_bad_txq); | |
111 | ||
112 | if (unlikely(skb)) | |
113 | skb = __skb_dequeue_bad_txq(q); | |
114 | ||
115 | return skb; | |
116 | } | |
117 | ||
118 | static inline void qdisc_enqueue_skb_bad_txq(struct Qdisc *q, | |
119 | struct sk_buff *skb) | |
120 | { | |
121 | spinlock_t *lock = NULL; | |
122 | ||
123 | if (q->flags & TCQ_F_NOLOCK) { | |
124 | lock = qdisc_lock(q); | |
125 | spin_lock(lock); | |
126 | } | |
127 | ||
128 | __skb_queue_tail(&q->skb_bad_txq, skb); | |
129 | ||
cce6294c ED |
130 | if (qdisc_is_percpu_stats(q)) { |
131 | qdisc_qstats_cpu_backlog_inc(q, skb); | |
73eb628d | 132 | qdisc_qstats_cpu_qlen_inc(q); |
cce6294c ED |
133 | } else { |
134 | qdisc_qstats_backlog_inc(q, skb); | |
135 | q->q.qlen++; | |
136 | } | |
137 | ||
70e57d5e JF |
138 | if (lock) |
139 | spin_unlock(lock); | |
140 | } | |
141 | ||
9c01c9f1 | 142 | static inline void dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q) |
c716a81a | 143 | { |
9c01c9f1 | 144 | spinlock_t *lock = NULL; |
9540d977 | 145 | |
9c01c9f1 PA |
146 | if (q->flags & TCQ_F_NOLOCK) { |
147 | lock = qdisc_lock(q); | |
148 | spin_lock(lock); | |
9540d977 | 149 | } |
c716a81a | 150 | |
9540d977 WY |
151 | while (skb) { |
152 | struct sk_buff *next = skb->next; | |
153 | ||
154 | __skb_queue_tail(&q->gso_skb, skb); | |
155 | ||
9c01c9f1 PA |
156 | /* it's still part of the queue */ |
157 | if (qdisc_is_percpu_stats(q)) { | |
158 | qdisc_qstats_cpu_requeues_inc(q); | |
159 | qdisc_qstats_cpu_backlog_inc(q, skb); | |
73eb628d | 160 | qdisc_qstats_cpu_qlen_inc(q); |
9c01c9f1 PA |
161 | } else { |
162 | q->qstats.requeues++; | |
163 | qdisc_qstats_backlog_inc(q, skb); | |
164 | q->q.qlen++; | |
165 | } | |
9540d977 WY |
166 | |
167 | skb = next; | |
168 | } | |
c4fef01b YL |
169 | |
170 | if (lock) { | |
9c01c9f1 | 171 | spin_unlock(lock); |
c4fef01b YL |
172 | set_bit(__QDISC_STATE_MISSED, &q->state); |
173 | } else { | |
174 | __netif_schedule(q); | |
175 | } | |
a53851e2 JF |
176 | } |
177 | ||
55a93b3e ED |
178 | static void try_bulk_dequeue_skb(struct Qdisc *q, |
179 | struct sk_buff *skb, | |
b8358d70 JDB |
180 | const struct netdev_queue *txq, |
181 | int *packets) | |
5772e9a3 | 182 | { |
55a93b3e | 183 | int bytelimit = qdisc_avail_bulklimit(txq) - skb->len; |
5772e9a3 JDB |
184 | |
185 | while (bytelimit > 0) { | |
55a93b3e | 186 | struct sk_buff *nskb = q->dequeue(q); |
5772e9a3 | 187 | |
55a93b3e | 188 | if (!nskb) |
5772e9a3 JDB |
189 | break; |
190 | ||
55a93b3e ED |
191 | bytelimit -= nskb->len; /* covers GSO len */ |
192 | skb->next = nskb; | |
193 | skb = nskb; | |
b8358d70 | 194 | (*packets)++; /* GSO counts as one pkt */ |
5772e9a3 | 195 | } |
a8305bff | 196 | skb_mark_not_on_list(skb); |
5772e9a3 JDB |
197 | } |
198 | ||
4d202a0d ED |
199 | /* This variant of try_bulk_dequeue_skb() makes sure |
200 | * all skbs in the chain are for the same txq | |
201 | */ | |
202 | static void try_bulk_dequeue_skb_slow(struct Qdisc *q, | |
203 | struct sk_buff *skb, | |
204 | int *packets) | |
205 | { | |
206 | int mapping = skb_get_queue_mapping(skb); | |
207 | struct sk_buff *nskb; | |
208 | int cnt = 0; | |
209 | ||
210 | do { | |
211 | nskb = q->dequeue(q); | |
212 | if (!nskb) | |
213 | break; | |
214 | if (unlikely(skb_get_queue_mapping(nskb) != mapping)) { | |
70e57d5e | 215 | qdisc_enqueue_skb_bad_txq(q, nskb); |
4d202a0d ED |
216 | break; |
217 | } | |
218 | skb->next = nskb; | |
219 | skb = nskb; | |
220 | } while (++cnt < 8); | |
221 | (*packets) += cnt; | |
a8305bff | 222 | skb_mark_not_on_list(skb); |
4d202a0d ED |
223 | } |
224 | ||
5772e9a3 JDB |
225 | /* Note that dequeue_skb can possibly return a SKB list (via skb->next). |
226 | * A requeued skb (via q->gso_skb) can also be a SKB list. | |
227 | */ | |
b8358d70 JDB |
228 | static struct sk_buff *dequeue_skb(struct Qdisc *q, bool *validate, |
229 | int *packets) | |
c716a81a | 230 | { |
1abbe139 | 231 | const struct netdev_queue *txq = q->dev_queue; |
fd8e8d1a | 232 | struct sk_buff *skb = NULL; |
554794de | 233 | |
b8358d70 | 234 | *packets = 1; |
a53851e2 JF |
235 | if (unlikely(!skb_queue_empty(&q->gso_skb))) { |
236 | spinlock_t *lock = NULL; | |
237 | ||
238 | if (q->flags & TCQ_F_NOLOCK) { | |
239 | lock = qdisc_lock(q); | |
240 | spin_lock(lock); | |
241 | } | |
242 | ||
243 | skb = skb_peek(&q->gso_skb); | |
244 | ||
245 | /* skb may be null if another cpu pulls gso_skb off in between | |
246 | * empty check and lock. | |
247 | */ | |
248 | if (!skb) { | |
249 | if (lock) | |
250 | spin_unlock(lock); | |
251 | goto validate; | |
252 | } | |
253 | ||
4d202a0d ED |
254 | /* skb in gso_skb were already validated */ |
255 | *validate = false; | |
f53c7239 SK |
256 | if (xfrm_offload(skb)) |
257 | *validate = true; | |
ebf05982 | 258 | /* check the reason of requeuing without tx lock first */ |
10c51b56 | 259 | txq = skb_get_tx_queue(txq->dev, skb); |
73466498 | 260 | if (!netif_xmit_frozen_or_stopped(txq)) { |
a53851e2 JF |
261 | skb = __skb_dequeue(&q->gso_skb); |
262 | if (qdisc_is_percpu_stats(q)) { | |
263 | qdisc_qstats_cpu_backlog_dec(q, skb); | |
73eb628d | 264 | qdisc_qstats_cpu_qlen_dec(q); |
a53851e2 JF |
265 | } else { |
266 | qdisc_qstats_backlog_dec(q, skb); | |
267 | q->q.qlen--; | |
268 | } | |
269 | } else { | |
ebf05982 | 270 | skb = NULL; |
dcad9ee9 | 271 | qdisc_maybe_clear_missed(q, txq); |
a53851e2 JF |
272 | } |
273 | if (lock) | |
274 | spin_unlock(lock); | |
e543002f | 275 | goto trace; |
4d202a0d | 276 | } |
a53851e2 | 277 | validate: |
4d202a0d | 278 | *validate = true; |
fd8e8d1a JF |
279 | |
280 | if ((q->flags & TCQ_F_ONETXQUEUE) && | |
dcad9ee9 YL |
281 | netif_xmit_frozen_or_stopped(txq)) { |
282 | qdisc_maybe_clear_missed(q, txq); | |
fd8e8d1a | 283 | return skb; |
dcad9ee9 | 284 | } |
fd8e8d1a | 285 | |
70e57d5e | 286 | skb = qdisc_dequeue_skb_bad_txq(q); |
b88dd52c ED |
287 | if (unlikely(skb)) { |
288 | if (skb == SKB_XOFF_MAGIC) | |
289 | return NULL; | |
70e57d5e | 290 | goto bulk; |
b88dd52c | 291 | } |
fd8e8d1a | 292 | skb = q->dequeue(q); |
4d202a0d ED |
293 | if (skb) { |
294 | bulk: | |
295 | if (qdisc_may_bulk(q)) | |
296 | try_bulk_dequeue_skb(q, skb, txq, packets); | |
297 | else | |
298 | try_bulk_dequeue_skb_slow(q, skb, packets); | |
ebf05982 | 299 | } |
e543002f JDB |
300 | trace: |
301 | trace_qdisc_dequeue(q, txq, *packets, skb); | |
c716a81a JHS |
302 | return skb; |
303 | } | |
304 | ||
10297b99 | 305 | /* |
10770bc2 | 306 | * Transmit possibly several skbs, and handle the return status as |
29cbcd85 AD |
307 | * required. Owning qdisc running bit guarantees that only one CPU |
308 | * can execute this function. | |
6c1361a6 KK |
309 | * |
310 | * Returns to the caller: | |
29b86cda JF |
311 | * false - hardware queue frozen backoff |
312 | * true - feel free to send more pkts | |
6c1361a6 | 313 | */ |
29b86cda JF |
314 | bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, |
315 | struct net_device *dev, struct netdev_queue *txq, | |
316 | spinlock_t *root_lock, bool validate) | |
1da177e4 | 317 | { |
5f1a485d | 318 | int ret = NETDEV_TX_BUSY; |
f53c7239 | 319 | bool again = false; |
7698b4fc DM |
320 | |
321 | /* And release qdisc */ | |
6b3ba914 JF |
322 | if (root_lock) |
323 | spin_unlock(root_lock); | |
c716a81a | 324 | |
55a93b3e ED |
325 | /* Note that we validate skb (GSO, checksum, ...) outside of locks */ |
326 | if (validate) | |
f53c7239 SK |
327 | skb = validate_xmit_skb_list(skb, dev, &again); |
328 | ||
329 | #ifdef CONFIG_XFRM_OFFLOAD | |
330 | if (unlikely(again)) { | |
331 | if (root_lock) | |
332 | spin_lock(root_lock); | |
333 | ||
334 | dev_requeue_skb(skb, q); | |
335 | return false; | |
336 | } | |
337 | #endif | |
572a9d7b | 338 | |
3dcd493f | 339 | if (likely(skb)) { |
55a93b3e ED |
340 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
341 | if (!netif_xmit_frozen_or_stopped(txq)) | |
342 | skb = dev_hard_start_xmit(skb, dev, txq, &ret); | |
dcad9ee9 YL |
343 | else |
344 | qdisc_maybe_clear_missed(q, txq); | |
c716a81a | 345 | |
55a93b3e | 346 | HARD_TX_UNLOCK(dev, txq); |
3dcd493f | 347 | } else { |
6b3ba914 JF |
348 | if (root_lock) |
349 | spin_lock(root_lock); | |
29b86cda | 350 | return true; |
55a93b3e | 351 | } |
6b3ba914 JF |
352 | |
353 | if (root_lock) | |
354 | spin_lock(root_lock); | |
c716a81a | 355 | |
29b86cda | 356 | if (!dev_xmit_complete(ret)) { |
6c1361a6 | 357 | /* Driver returned NETDEV_TX_BUSY - requeue skb */ |
e87cc472 JP |
358 | if (unlikely(ret != NETDEV_TX_BUSY)) |
359 | net_warn_ratelimited("BUG %s code %d qlen %d\n", | |
360 | dev->name, ret, q->q.qlen); | |
6c1361a6 | 361 | |
29b86cda JF |
362 | dev_requeue_skb(skb, q); |
363 | return false; | |
6c1361a6 | 364 | } |
c716a81a | 365 | |
29b86cda | 366 | return true; |
1da177e4 LT |
367 | } |
368 | ||
bbd8a0d3 KK |
369 | /* |
370 | * NOTE: Called under qdisc_lock(q) with locally disabled BH. | |
371 | * | |
f9eb8aea | 372 | * running seqcount guarantees only one CPU can process |
bbd8a0d3 KK |
373 | * this qdisc at a time. qdisc_lock(q) serializes queue accesses for |
374 | * this queue. | |
375 | * | |
376 | * netif_tx_lock serializes accesses to device driver. | |
377 | * | |
378 | * qdisc_lock(q) and netif_tx_lock are mutually exclusive, | |
379 | * if one is grabbed, another must be free. | |
380 | * | |
381 | * Note, that this procedure can be called by a watchdog timer | |
382 | * | |
383 | * Returns to the caller: | |
384 | * 0 - queue is empty or throttled. | |
385 | * >0 - queue is not empty. | |
386 | * | |
387 | */ | |
29b86cda | 388 | static inline bool qdisc_restart(struct Qdisc *q, int *packets) |
bbd8a0d3 | 389 | { |
6b3ba914 | 390 | spinlock_t *root_lock = NULL; |
bbd8a0d3 KK |
391 | struct netdev_queue *txq; |
392 | struct net_device *dev; | |
bbd8a0d3 | 393 | struct sk_buff *skb; |
32f7b44d | 394 | bool validate; |
bbd8a0d3 KK |
395 | |
396 | /* Dequeue packet */ | |
b8358d70 | 397 | skb = dequeue_skb(q, &validate, packets); |
32f7b44d | 398 | if (unlikely(!skb)) |
29b86cda | 399 | return false; |
10c51b56 | 400 | |
32f7b44d | 401 | if (!(q->flags & TCQ_F_NOLOCK)) |
6b3ba914 JF |
402 | root_lock = qdisc_lock(q); |
403 | ||
bbd8a0d3 | 404 | dev = qdisc_dev(q); |
10c51b56 | 405 | txq = skb_get_tx_queue(dev, skb); |
bbd8a0d3 | 406 | |
32f7b44d | 407 | return sch_direct_xmit(skb, q, dev, txq, root_lock, validate); |
bbd8a0d3 KK |
408 | } |
409 | ||
37437bb2 | 410 | void __qdisc_run(struct Qdisc *q) |
48d83325 | 411 | { |
bf955b5a | 412 | int quota = READ_ONCE(dev_tx_weight); |
b8358d70 | 413 | int packets; |
2ba2506c | 414 | |
b8358d70 | 415 | while (qdisc_restart(q, &packets)) { |
b8358d70 | 416 | quota -= packets; |
b60fa1c5 | 417 | if (quota <= 0) { |
c4fef01b YL |
418 | if (q->flags & TCQ_F_NOLOCK) |
419 | set_bit(__QDISC_STATE_MISSED, &q->state); | |
420 | else | |
421 | __netif_schedule(q); | |
422 | ||
d90df3ad | 423 | break; |
2ba2506c HX |
424 | } |
425 | } | |
48d83325 HX |
426 | } |
427 | ||
9d21493b ED |
428 | unsigned long dev_trans_start(struct net_device *dev) |
429 | { | |
4873a1b2 VO |
430 | unsigned long res = READ_ONCE(netdev_get_tx_queue(dev, 0)->trans_start); |
431 | unsigned long val; | |
9d21493b ED |
432 | unsigned int i; |
433 | ||
9b36627a | 434 | for (i = 1; i < dev->num_tx_queues; i++) { |
5337824f | 435 | val = READ_ONCE(netdev_get_tx_queue(dev, i)->trans_start); |
9d21493b ED |
436 | if (val && time_after(val, res)) |
437 | res = val; | |
438 | } | |
07ce76aa | 439 | |
9d21493b ED |
440 | return res; |
441 | } | |
442 | EXPORT_SYMBOL(dev_trans_start); | |
443 | ||
dab8fe32 ED |
444 | static void netif_freeze_queues(struct net_device *dev) |
445 | { | |
446 | unsigned int i; | |
447 | int cpu; | |
448 | ||
449 | cpu = smp_processor_id(); | |
450 | for (i = 0; i < dev->num_tx_queues; i++) { | |
451 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
452 | ||
453 | /* We are the only thread of execution doing a | |
454 | * freeze, but we have to grab the _xmit_lock in | |
455 | * order to synchronize with threads which are in | |
456 | * the ->hard_start_xmit() handler and already | |
457 | * checked the frozen bit. | |
458 | */ | |
459 | __netif_tx_lock(txq, cpu); | |
460 | set_bit(__QUEUE_STATE_FROZEN, &txq->state); | |
461 | __netif_tx_unlock(txq); | |
462 | } | |
463 | } | |
464 | ||
465 | void netif_tx_lock(struct net_device *dev) | |
466 | { | |
467 | spin_lock(&dev->tx_global_lock); | |
468 | netif_freeze_queues(dev); | |
469 | } | |
470 | EXPORT_SYMBOL(netif_tx_lock); | |
471 | ||
472 | static void netif_unfreeze_queues(struct net_device *dev) | |
473 | { | |
474 | unsigned int i; | |
475 | ||
476 | for (i = 0; i < dev->num_tx_queues; i++) { | |
477 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
478 | ||
479 | /* No need to grab the _xmit_lock here. If the | |
480 | * queue is not stopped for another reason, we | |
481 | * force a schedule. | |
482 | */ | |
483 | clear_bit(__QUEUE_STATE_FROZEN, &txq->state); | |
484 | netif_schedule_queue(txq); | |
485 | } | |
486 | } | |
487 | ||
488 | void netif_tx_unlock(struct net_device *dev) | |
489 | { | |
490 | netif_unfreeze_queues(dev); | |
491 | spin_unlock(&dev->tx_global_lock); | |
492 | } | |
493 | EXPORT_SYMBOL(netif_tx_unlock); | |
494 | ||
cdeabbb8 | 495 | static void dev_watchdog(struct timer_list *t) |
1da177e4 | 496 | { |
cdeabbb8 | 497 | struct net_device *dev = from_timer(dev, t, watchdog_timer); |
f12bf6f3 | 498 | bool release = true; |
1da177e4 | 499 | |
bec251bc | 500 | spin_lock(&dev->tx_global_lock); |
e8a0464c | 501 | if (!qdisc_tx_is_noop(dev)) { |
1da177e4 LT |
502 | if (netif_device_present(dev) && |
503 | netif_running(dev) && | |
504 | netif_carrier_ok(dev)) { | |
9d21493b | 505 | int some_queue_timedout = 0; |
e8a0464c | 506 | unsigned int i; |
9d21493b | 507 | unsigned long trans_start; |
e8a0464c DM |
508 | |
509 | for (i = 0; i < dev->num_tx_queues; i++) { | |
510 | struct netdev_queue *txq; | |
511 | ||
512 | txq = netdev_get_tx_queue(dev, i); | |
5337824f | 513 | trans_start = READ_ONCE(txq->trans_start); |
73466498 | 514 | if (netif_xmit_stopped(txq) && |
9d21493b ED |
515 | time_after(jiffies, (trans_start + |
516 | dev->watchdog_timeo))) { | |
517 | some_queue_timedout = 1; | |
8160fb43 | 518 | atomic_long_inc(&txq->trans_timeout); |
e8a0464c DM |
519 | break; |
520 | } | |
521 | } | |
338f7566 | 522 | |
bec251bc | 523 | if (unlikely(some_queue_timedout)) { |
141b6b2a | 524 | trace_net_dev_xmit_timeout(dev, i); |
9d21493b | 525 | WARN_ONCE(1, KERN_INFO "NETDEV WATCHDOG: %s (%s): transmit queue %u timed out\n", |
3019de12 | 526 | dev->name, netdev_drivername(dev), i); |
bec251bc | 527 | netif_freeze_queues(dev); |
0290bd29 | 528 | dev->netdev_ops->ndo_tx_timeout(dev, i); |
bec251bc | 529 | netif_unfreeze_queues(dev); |
1da177e4 | 530 | } |
e8a0464c DM |
531 | if (!mod_timer(&dev->watchdog_timer, |
532 | round_jiffies(jiffies + | |
533 | dev->watchdog_timeo))) | |
f12bf6f3 | 534 | release = false; |
1da177e4 LT |
535 | } |
536 | } | |
bec251bc | 537 | spin_unlock(&dev->tx_global_lock); |
1da177e4 | 538 | |
f12bf6f3 | 539 | if (release) |
d62607c3 | 540 | netdev_put(dev, &dev->watchdog_dev_tracker); |
1da177e4 LT |
541 | } |
542 | ||
1da177e4 LT |
543 | void __netdev_watchdog_up(struct net_device *dev) |
544 | { | |
d314774c | 545 | if (dev->netdev_ops->ndo_tx_timeout) { |
1da177e4 LT |
546 | if (dev->watchdog_timeo <= 0) |
547 | dev->watchdog_timeo = 5*HZ; | |
60468d5b VP |
548 | if (!mod_timer(&dev->watchdog_timer, |
549 | round_jiffies(jiffies + dev->watchdog_timeo))) | |
d62607c3 JK |
550 | netdev_hold(dev, &dev->watchdog_dev_tracker, |
551 | GFP_ATOMIC); | |
1da177e4 LT |
552 | } |
553 | } | |
1a3db27a | 554 | EXPORT_SYMBOL_GPL(__netdev_watchdog_up); |
1da177e4 LT |
555 | |
556 | static void dev_watchdog_up(struct net_device *dev) | |
557 | { | |
1da177e4 | 558 | __netdev_watchdog_up(dev); |
1da177e4 LT |
559 | } |
560 | ||
561 | static void dev_watchdog_down(struct net_device *dev) | |
562 | { | |
932ff279 | 563 | netif_tx_lock_bh(dev); |
1da177e4 | 564 | if (del_timer(&dev->watchdog_timer)) |
d62607c3 | 565 | netdev_put(dev, &dev->watchdog_dev_tracker); |
932ff279 | 566 | netif_tx_unlock_bh(dev); |
1da177e4 LT |
567 | } |
568 | ||
bea3348e SH |
569 | /** |
570 | * netif_carrier_on - set carrier | |
571 | * @dev: network device | |
572 | * | |
989723b0 | 573 | * Device has detected acquisition of carrier. |
bea3348e | 574 | */ |
0a242efc DV |
575 | void netif_carrier_on(struct net_device *dev) |
576 | { | |
bfaae0f0 | 577 | if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
b4730016 DM |
578 | if (dev->reg_state == NETREG_UNINITIALIZED) |
579 | return; | |
b2d3bcfa | 580 | atomic_inc(&dev->carrier_up_count); |
0a242efc | 581 | linkwatch_fire_event(dev); |
bfaae0f0 JG |
582 | if (netif_running(dev)) |
583 | __netdev_watchdog_up(dev); | |
584 | } | |
0a242efc | 585 | } |
62e3ba1b | 586 | EXPORT_SYMBOL(netif_carrier_on); |
0a242efc | 587 | |
bea3348e SH |
588 | /** |
589 | * netif_carrier_off - clear carrier | |
590 | * @dev: network device | |
591 | * | |
592 | * Device has detected loss of carrier. | |
593 | */ | |
0a242efc DV |
594 | void netif_carrier_off(struct net_device *dev) |
595 | { | |
b4730016 DM |
596 | if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
597 | if (dev->reg_state == NETREG_UNINITIALIZED) | |
598 | return; | |
b2d3bcfa | 599 | atomic_inc(&dev->carrier_down_count); |
0a242efc | 600 | linkwatch_fire_event(dev); |
b4730016 | 601 | } |
0a242efc | 602 | } |
62e3ba1b | 603 | EXPORT_SYMBOL(netif_carrier_off); |
0a242efc | 604 | |
490dceca JK |
605 | /** |
606 | * netif_carrier_event - report carrier state event | |
607 | * @dev: network device | |
608 | * | |
609 | * Device has detected a carrier event but the carrier state wasn't changed. | |
610 | * Use in drivers when querying carrier state asynchronously, to avoid missing | |
611 | * events (link flaps) if link recovers before it's queried. | |
612 | */ | |
613 | void netif_carrier_event(struct net_device *dev) | |
614 | { | |
615 | if (dev->reg_state == NETREG_UNINITIALIZED) | |
616 | return; | |
617 | atomic_inc(&dev->carrier_up_count); | |
618 | atomic_inc(&dev->carrier_down_count); | |
619 | linkwatch_fire_event(dev); | |
620 | } | |
621 | EXPORT_SYMBOL_GPL(netif_carrier_event); | |
622 | ||
1da177e4 LT |
623 | /* "NOOP" scheduler: the best scheduler, recommended for all interfaces |
624 | under all circumstances. It is difficult to invent anything faster or | |
625 | cheaper. | |
626 | */ | |
627 | ||
520ac30f ED |
628 | static int noop_enqueue(struct sk_buff *skb, struct Qdisc *qdisc, |
629 | struct sk_buff **to_free) | |
1da177e4 | 630 | { |
520ac30f | 631 | __qdisc_drop(skb, to_free); |
1da177e4 LT |
632 | return NET_XMIT_CN; |
633 | } | |
634 | ||
82d567c2 | 635 | static struct sk_buff *noop_dequeue(struct Qdisc *qdisc) |
1da177e4 LT |
636 | { |
637 | return NULL; | |
638 | } | |
639 | ||
20fea08b | 640 | struct Qdisc_ops noop_qdisc_ops __read_mostly = { |
1da177e4 LT |
641 | .id = "noop", |
642 | .priv_size = 0, | |
643 | .enqueue = noop_enqueue, | |
644 | .dequeue = noop_dequeue, | |
99c0db26 | 645 | .peek = noop_dequeue, |
1da177e4 LT |
646 | .owner = THIS_MODULE, |
647 | }; | |
648 | ||
7698b4fc | 649 | static struct netdev_queue noop_netdev_queue = { |
3b40bf4e | 650 | RCU_POINTER_INITIALIZER(qdisc, &noop_qdisc), |
9f3ffae0 | 651 | .qdisc_sleeping = &noop_qdisc, |
7698b4fc DM |
652 | }; |
653 | ||
1da177e4 LT |
654 | struct Qdisc noop_qdisc = { |
655 | .enqueue = noop_enqueue, | |
656 | .dequeue = noop_dequeue, | |
657 | .flags = TCQ_F_BUILTIN, | |
10297b99 | 658 | .ops = &noop_qdisc_ops, |
83874000 | 659 | .q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock), |
7698b4fc | 660 | .dev_queue = &noop_netdev_queue, |
7b5edbc4 | 661 | .busylock = __SPIN_LOCK_UNLOCKED(noop_qdisc.busylock), |
f98ebd47 ED |
662 | .gso_skb = { |
663 | .next = (struct sk_buff *)&noop_qdisc.gso_skb, | |
664 | .prev = (struct sk_buff *)&noop_qdisc.gso_skb, | |
665 | .qlen = 0, | |
666 | .lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.gso_skb.lock), | |
667 | }, | |
668 | .skb_bad_txq = { | |
669 | .next = (struct sk_buff *)&noop_qdisc.skb_bad_txq, | |
670 | .prev = (struct sk_buff *)&noop_qdisc.skb_bad_txq, | |
671 | .qlen = 0, | |
672 | .lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.skb_bad_txq.lock), | |
673 | }, | |
1da177e4 | 674 | }; |
62e3ba1b | 675 | EXPORT_SYMBOL(noop_qdisc); |
1da177e4 | 676 | |
e63d7dfd AA |
677 | static int noqueue_init(struct Qdisc *qdisc, struct nlattr *opt, |
678 | struct netlink_ext_ack *extack) | |
d66d6c31 PS |
679 | { |
680 | /* register_qdisc() assigns a default of noop_enqueue if unset, | |
681 | * but __dev_queue_xmit() treats noqueue only as such | |
682 | * if this is NULL - so clear it here. */ | |
683 | qdisc->enqueue = NULL; | |
684 | return 0; | |
685 | } | |
686 | ||
687 | struct Qdisc_ops noqueue_qdisc_ops __read_mostly = { | |
1da177e4 LT |
688 | .id = "noqueue", |
689 | .priv_size = 0, | |
d66d6c31 | 690 | .init = noqueue_init, |
1da177e4 LT |
691 | .enqueue = noop_enqueue, |
692 | .dequeue = noop_dequeue, | |
99c0db26 | 693 | .peek = noop_dequeue, |
1da177e4 LT |
694 | .owner = THIS_MODULE, |
695 | }; | |
696 | ||
cc7ec456 ED |
697 | static const u8 prio2band[TC_PRIO_MAX + 1] = { |
698 | 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 | |
699 | }; | |
d3678b46 DM |
700 | |
701 | /* 3-band FIFO queue: old style, but should be a bit faster than | |
702 | generic prio+fifo combination. | |
703 | */ | |
704 | ||
705 | #define PFIFO_FAST_BANDS 3 | |
706 | ||
fd3ae5e8 KK |
707 | /* |
708 | * Private data for a pfifo_fast scheduler containing: | |
c5ad119f | 709 | * - rings for priority bands |
fd3ae5e8 KK |
710 | */ |
711 | struct pfifo_fast_priv { | |
c5ad119f | 712 | struct skb_array q[PFIFO_FAST_BANDS]; |
fd3ae5e8 KK |
713 | }; |
714 | ||
c5ad119f JF |
715 | static inline struct skb_array *band2list(struct pfifo_fast_priv *priv, |
716 | int band) | |
d3678b46 | 717 | { |
c5ad119f | 718 | return &priv->q[band]; |
d3678b46 DM |
719 | } |
720 | ||
520ac30f ED |
721 | static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc, |
722 | struct sk_buff **to_free) | |
321090e7 | 723 | { |
c5ad119f JF |
724 | int band = prio2band[skb->priority & TC_PRIO_MAX]; |
725 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); | |
726 | struct skb_array *q = band2list(priv, band); | |
cce6294c | 727 | unsigned int pkt_len = qdisc_pkt_len(skb); |
c5ad119f | 728 | int err; |
821d24ae | 729 | |
c5ad119f JF |
730 | err = skb_array_produce(q, skb); |
731 | ||
092e22e5 DC |
732 | if (unlikely(err)) { |
733 | if (qdisc_is_percpu_stats(qdisc)) | |
734 | return qdisc_drop_cpu(skb, qdisc, to_free); | |
735 | else | |
736 | return qdisc_drop(skb, qdisc, to_free); | |
737 | } | |
c5ad119f | 738 | |
8a53e616 | 739 | qdisc_update_stats_at_enqueue(qdisc, pkt_len); |
c5ad119f | 740 | return NET_XMIT_SUCCESS; |
1da177e4 LT |
741 | } |
742 | ||
cc7ec456 | 743 | static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc) |
1da177e4 | 744 | { |
fd3ae5e8 | 745 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
c5ad119f | 746 | struct sk_buff *skb = NULL; |
a90c57f2 | 747 | bool need_retry = true; |
c5ad119f | 748 | int band; |
ec323368 | 749 | |
a90c57f2 | 750 | retry: |
c5ad119f JF |
751 | for (band = 0; band < PFIFO_FAST_BANDS && !skb; band++) { |
752 | struct skb_array *q = band2list(priv, band); | |
fd3ae5e8 | 753 | |
c5ad119f JF |
754 | if (__skb_array_empty(q)) |
755 | continue; | |
fd3ae5e8 | 756 | |
021a17ed | 757 | skb = __skb_array_consume(q); |
c5ad119f JF |
758 | } |
759 | if (likely(skb)) { | |
8a53e616 | 760 | qdisc_update_stats_at_dequeue(qdisc, skb); |
a90c57f2 | 761 | } else if (need_retry && |
c4fef01b | 762 | READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY) { |
a90c57f2 YL |
763 | /* Delay clearing the STATE_MISSED here to reduce |
764 | * the overhead of the second spin_trylock() in | |
765 | * qdisc_run_begin() and __netif_schedule() calling | |
766 | * in qdisc_run_end(). | |
767 | */ | |
768 | clear_bit(__QDISC_STATE_MISSED, &qdisc->state); | |
c4fef01b | 769 | clear_bit(__QDISC_STATE_DRAINING, &qdisc->state); |
a90c57f2 YL |
770 | |
771 | /* Make sure dequeuing happens after clearing | |
772 | * STATE_MISSED. | |
773 | */ | |
774 | smp_mb__after_atomic(); | |
775 | ||
776 | need_retry = false; | |
777 | ||
778 | goto retry; | |
d3678b46 | 779 | } |
f87a9c3d | 780 | |
c5ad119f | 781 | return skb; |
1da177e4 LT |
782 | } |
783 | ||
cc7ec456 | 784 | static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc) |
99c0db26 | 785 | { |
fd3ae5e8 | 786 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
c5ad119f JF |
787 | struct sk_buff *skb = NULL; |
788 | int band; | |
fd3ae5e8 | 789 | |
c5ad119f JF |
790 | for (band = 0; band < PFIFO_FAST_BANDS && !skb; band++) { |
791 | struct skb_array *q = band2list(priv, band); | |
99c0db26 | 792 | |
c5ad119f | 793 | skb = __skb_array_peek(q); |
99c0db26 JP |
794 | } |
795 | ||
c5ad119f | 796 | return skb; |
99c0db26 JP |
797 | } |
798 | ||
cc7ec456 | 799 | static void pfifo_fast_reset(struct Qdisc *qdisc) |
1da177e4 | 800 | { |
c5ad119f | 801 | int i, band; |
fd3ae5e8 | 802 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
d3678b46 | 803 | |
c5ad119f JF |
804 | for (band = 0; band < PFIFO_FAST_BANDS; band++) { |
805 | struct skb_array *q = band2list(priv, band); | |
806 | struct sk_buff *skb; | |
d3678b46 | 807 | |
1df94c3c CW |
808 | /* NULL ring is possible if destroy path is due to a failed |
809 | * skb_array_init() in pfifo_fast_init() case. | |
810 | */ | |
811 | if (!q->ring.queue) | |
812 | continue; | |
813 | ||
021a17ed | 814 | while ((skb = __skb_array_consume(q)) != NULL) |
c5ad119f JF |
815 | kfree_skb(skb); |
816 | } | |
817 | ||
04d37cf4 DC |
818 | if (qdisc_is_percpu_stats(qdisc)) { |
819 | for_each_possible_cpu(i) { | |
820 | struct gnet_stats_queue *q; | |
c5ad119f | 821 | |
04d37cf4 DC |
822 | q = per_cpu_ptr(qdisc->cpu_qstats, i); |
823 | q->backlog = 0; | |
824 | q->qlen = 0; | |
825 | } | |
c5ad119f | 826 | } |
1da177e4 LT |
827 | } |
828 | ||
d3678b46 DM |
829 | static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) |
830 | { | |
831 | struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; | |
832 | ||
cc7ec456 | 833 | memcpy(&opt.priomap, prio2band, TC_PRIO_MAX + 1); |
1b34ec43 DM |
834 | if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
835 | goto nla_put_failure; | |
d3678b46 DM |
836 | return skb->len; |
837 | ||
838 | nla_put_failure: | |
839 | return -1; | |
840 | } | |
841 | ||
e63d7dfd AA |
842 | static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt, |
843 | struct netlink_ext_ack *extack) | |
d3678b46 | 844 | { |
c5ad119f | 845 | unsigned int qlen = qdisc_dev(qdisc)->tx_queue_len; |
fd3ae5e8 | 846 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
c5ad119f JF |
847 | int prio; |
848 | ||
849 | /* guard against zero length rings */ | |
850 | if (!qlen) | |
851 | return -EINVAL; | |
d3678b46 | 852 | |
c5ad119f JF |
853 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) { |
854 | struct skb_array *q = band2list(priv, prio); | |
855 | int err; | |
856 | ||
857 | err = skb_array_init(q, qlen, GFP_KERNEL); | |
858 | if (err) | |
859 | return -ENOMEM; | |
860 | } | |
d3678b46 | 861 | |
23624935 ED |
862 | /* Can by-pass the queue discipline */ |
863 | qdisc->flags |= TCQ_F_CAN_BYPASS; | |
d3678b46 DM |
864 | return 0; |
865 | } | |
866 | ||
c5ad119f JF |
867 | static void pfifo_fast_destroy(struct Qdisc *sch) |
868 | { | |
869 | struct pfifo_fast_priv *priv = qdisc_priv(sch); | |
870 | int prio; | |
871 | ||
872 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) { | |
873 | struct skb_array *q = band2list(priv, prio); | |
874 | ||
875 | /* NULL ring is possible if destroy path is due to a failed | |
876 | * skb_array_init() in pfifo_fast_init() case. | |
877 | */ | |
1df94c3c | 878 | if (!q->ring.queue) |
c5ad119f JF |
879 | continue; |
880 | /* Destroy ring but no need to kfree_skb because a call to | |
881 | * pfifo_fast_reset() has already done that work. | |
882 | */ | |
883 | ptr_ring_cleanup(&q->ring, NULL); | |
884 | } | |
885 | } | |
886 | ||
7007ba63 CW |
887 | static int pfifo_fast_change_tx_queue_len(struct Qdisc *sch, |
888 | unsigned int new_len) | |
889 | { | |
890 | struct pfifo_fast_priv *priv = qdisc_priv(sch); | |
891 | struct skb_array *bands[PFIFO_FAST_BANDS]; | |
892 | int prio; | |
893 | ||
894 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) { | |
895 | struct skb_array *q = band2list(priv, prio); | |
896 | ||
897 | bands[prio] = q; | |
898 | } | |
899 | ||
900 | return skb_array_resize_multiple(bands, PFIFO_FAST_BANDS, new_len, | |
901 | GFP_KERNEL); | |
902 | } | |
903 | ||
6ec1c69a | 904 | struct Qdisc_ops pfifo_fast_ops __read_mostly = { |
d3678b46 | 905 | .id = "pfifo_fast", |
fd3ae5e8 | 906 | .priv_size = sizeof(struct pfifo_fast_priv), |
d3678b46 DM |
907 | .enqueue = pfifo_fast_enqueue, |
908 | .dequeue = pfifo_fast_dequeue, | |
99c0db26 | 909 | .peek = pfifo_fast_peek, |
d3678b46 | 910 | .init = pfifo_fast_init, |
c5ad119f | 911 | .destroy = pfifo_fast_destroy, |
d3678b46 DM |
912 | .reset = pfifo_fast_reset, |
913 | .dump = pfifo_fast_dump, | |
7007ba63 | 914 | .change_tx_queue_len = pfifo_fast_change_tx_queue_len, |
1da177e4 | 915 | .owner = THIS_MODULE, |
c5ad119f | 916 | .static_flags = TCQ_F_NOLOCK | TCQ_F_CPUSTATS, |
1da177e4 | 917 | }; |
1f27cde3 | 918 | EXPORT_SYMBOL(pfifo_fast_ops); |
1da177e4 | 919 | |
1a33e10e | 920 | static struct lock_class_key qdisc_tx_busylock; |
1a33e10e | 921 | |
5ce2d488 | 922 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d0bd684d AA |
923 | const struct Qdisc_ops *ops, |
924 | struct netlink_ext_ack *extack) | |
1da177e4 | 925 | { |
1da177e4 | 926 | struct Qdisc *sch; |
846e463a | 927 | unsigned int size = sizeof(*sch) + ops->priv_size; |
3d54b82f | 928 | int err = -ENOBUFS; |
26aa0459 JSP |
929 | struct net_device *dev; |
930 | ||
931 | if (!dev_queue) { | |
d0bd684d | 932 | NL_SET_ERR_MSG(extack, "No device queue given"); |
26aa0459 JSP |
933 | err = -EINVAL; |
934 | goto errout; | |
935 | } | |
1da177e4 | 936 | |
26aa0459 | 937 | dev = dev_queue->dev; |
846e463a | 938 | sch = kzalloc_node(size, GFP_KERNEL, netdev_queue_numa_node_read(dev_queue)); |
f2cd2d3e | 939 | |
846e463a | 940 | if (!sch) |
3d54b82f | 941 | goto errout; |
a53851e2 | 942 | __skb_queue_head_init(&sch->gso_skb); |
70e57d5e | 943 | __skb_queue_head_init(&sch->skb_bad_txq); |
50dc9a85 | 944 | gnet_stats_basic_sync_init(&sch->bstats); |
48da34b7 | 945 | spin_lock_init(&sch->q.lock); |
23d3b8bf | 946 | |
d59f5ffa JF |
947 | if (ops->static_flags & TCQ_F_CPUSTATS) { |
948 | sch->cpu_bstats = | |
50dc9a85 | 949 | netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync); |
d59f5ffa JF |
950 | if (!sch->cpu_bstats) |
951 | goto errout1; | |
952 | ||
953 | sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); | |
954 | if (!sch->cpu_qstats) { | |
955 | free_percpu(sch->cpu_bstats); | |
956 | goto errout1; | |
957 | } | |
958 | } | |
959 | ||
79640a4c | 960 | spin_lock_init(&sch->busylock); |
1a33e10e CW |
961 | lockdep_set_class(&sch->busylock, |
962 | dev->qdisc_tx_busylock ?: &qdisc_tx_busylock); | |
963 | ||
96009c7d PA |
964 | /* seqlock has the same scope of busylock, for NOLOCK qdisc */ |
965 | spin_lock_init(&sch->seqlock); | |
06f5553e | 966 | lockdep_set_class(&sch->seqlock, |
1a33e10e | 967 | dev->qdisc_tx_busylock ?: &qdisc_tx_busylock); |
f9eb8aea | 968 | |
1da177e4 | 969 | sch->ops = ops; |
d59f5ffa | 970 | sch->flags = ops->static_flags; |
1da177e4 LT |
971 | sch->enqueue = ops->enqueue; |
972 | sch->dequeue = ops->dequeue; | |
bb949fbd | 973 | sch->dev_queue = dev_queue; |
d62607c3 | 974 | netdev_hold(dev, &sch->dev_tracker, GFP_KERNEL); |
7b936405 | 975 | refcount_set(&sch->refcnt, 1); |
3d54b82f TG |
976 | |
977 | return sch; | |
d59f5ffa | 978 | errout1: |
846e463a | 979 | kfree(sch); |
3d54b82f | 980 | errout: |
01e123d7 | 981 | return ERR_PTR(err); |
3d54b82f TG |
982 | } |
983 | ||
3511c913 | 984 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 985 | const struct Qdisc_ops *ops, |
a38a9882 AA |
986 | unsigned int parentid, |
987 | struct netlink_ext_ack *extack) | |
3d54b82f TG |
988 | { |
989 | struct Qdisc *sch; | |
10297b99 | 990 | |
a38a9882 AA |
991 | if (!try_module_get(ops->owner)) { |
992 | NL_SET_ERR_MSG(extack, "Failed to increase module reference counter"); | |
166ee5b8 | 993 | return NULL; |
a38a9882 | 994 | } |
6da7c8fc | 995 | |
a38a9882 | 996 | sch = qdisc_alloc(dev_queue, ops, extack); |
166ee5b8 ED |
997 | if (IS_ERR(sch)) { |
998 | module_put(ops->owner); | |
999 | return NULL; | |
1000 | } | |
9f9afec4 | 1001 | sch->parent = parentid; |
3d54b82f | 1002 | |
f5a7833e CW |
1003 | if (!ops->init || ops->init(sch, NULL, extack) == 0) { |
1004 | trace_qdisc_create(ops, dev_queue->dev, parentid); | |
1da177e4 | 1005 | return sch; |
f5a7833e | 1006 | } |
1da177e4 | 1007 | |
86bd446b | 1008 | qdisc_put(sch); |
1da177e4 LT |
1009 | return NULL; |
1010 | } | |
62e3ba1b | 1011 | EXPORT_SYMBOL(qdisc_create_dflt); |
1da177e4 | 1012 | |
5fb66229 | 1013 | /* Under qdisc_lock(qdisc) and BH! */ |
1da177e4 LT |
1014 | |
1015 | void qdisc_reset(struct Qdisc *qdisc) | |
1016 | { | |
20fea08b | 1017 | const struct Qdisc_ops *ops = qdisc->ops; |
1da177e4 | 1018 | |
a34dac0b CW |
1019 | trace_qdisc_reset(qdisc); |
1020 | ||
1da177e4 LT |
1021 | if (ops->reset) |
1022 | ops->reset(qdisc); | |
67305ebc | 1023 | |
c9a40d1c ED |
1024 | __skb_queue_purge(&qdisc->gso_skb); |
1025 | __skb_queue_purge(&qdisc->skb_bad_txq); | |
70e57d5e | 1026 | |
4d202a0d | 1027 | qdisc->q.qlen = 0; |
c8e18129 | 1028 | qdisc->qstats.backlog = 0; |
1da177e4 | 1029 | } |
62e3ba1b | 1030 | EXPORT_SYMBOL(qdisc_reset); |
1da177e4 | 1031 | |
81d947e2 | 1032 | void qdisc_free(struct Qdisc *qdisc) |
5d944c64 | 1033 | { |
73c20a8b | 1034 | if (qdisc_is_percpu_stats(qdisc)) { |
22e0f8b9 | 1035 | free_percpu(qdisc->cpu_bstats); |
73c20a8b JF |
1036 | free_percpu(qdisc->cpu_qstats); |
1037 | } | |
22e0f8b9 | 1038 | |
846e463a | 1039 | kfree(qdisc); |
5d944c64 ED |
1040 | } |
1041 | ||
5362700c | 1042 | static void qdisc_free_cb(struct rcu_head *head) |
3a7d0d07 VB |
1043 | { |
1044 | struct Qdisc *q = container_of(head, struct Qdisc, rcu); | |
1045 | ||
1046 | qdisc_free(q); | |
1047 | } | |
1048 | ||
86bd446b | 1049 | static void qdisc_destroy(struct Qdisc *qdisc) |
1da177e4 | 1050 | { |
8a34c5dc DM |
1051 | const struct Qdisc_ops *ops = qdisc->ops; |
1052 | ||
3a682fbd | 1053 | #ifdef CONFIG_NET_SCHED |
59cc1f61 | 1054 | qdisc_hash_del(qdisc); |
f6e0b239 | 1055 | |
a2da570d | 1056 | qdisc_put_stab(rtnl_dereference(qdisc->stab)); |
3a682fbd | 1057 | #endif |
1c0d32fd | 1058 | gen_kill_estimator(&qdisc->rate_est); |
4909daba CW |
1059 | |
1060 | qdisc_reset(qdisc); | |
1061 | ||
8a34c5dc DM |
1062 | if (ops->destroy) |
1063 | ops->destroy(qdisc); | |
1064 | ||
1065 | module_put(ops->owner); | |
d62607c3 | 1066 | netdev_put(qdisc_dev(qdisc), &qdisc->dev_tracker); |
8a34c5dc | 1067 | |
a34dac0b CW |
1068 | trace_qdisc_destroy(qdisc); |
1069 | ||
3a7d0d07 | 1070 | call_rcu(&qdisc->rcu, qdisc_free_cb); |
1da177e4 | 1071 | } |
86bd446b VB |
1072 | |
1073 | void qdisc_put(struct Qdisc *qdisc) | |
1074 | { | |
6efb971b CW |
1075 | if (!qdisc) |
1076 | return; | |
1077 | ||
86bd446b VB |
1078 | if (qdisc->flags & TCQ_F_BUILTIN || |
1079 | !refcount_dec_and_test(&qdisc->refcnt)) | |
1080 | return; | |
1081 | ||
1082 | qdisc_destroy(qdisc); | |
1083 | } | |
1084 | EXPORT_SYMBOL(qdisc_put); | |
1da177e4 | 1085 | |
3a7d0d07 VB |
1086 | /* Version of qdisc_put() that is called with rtnl mutex unlocked. |
1087 | * Intended to be used as optimization, this function only takes rtnl lock if | |
1088 | * qdisc reference counter reached zero. | |
1089 | */ | |
1090 | ||
1091 | void qdisc_put_unlocked(struct Qdisc *qdisc) | |
1092 | { | |
1093 | if (qdisc->flags & TCQ_F_BUILTIN || | |
1094 | !refcount_dec_and_rtnl_lock(&qdisc->refcnt)) | |
1095 | return; | |
1096 | ||
1097 | qdisc_destroy(qdisc); | |
1098 | rtnl_unlock(); | |
1099 | } | |
1100 | EXPORT_SYMBOL(qdisc_put_unlocked); | |
1101 | ||
589983cd PM |
1102 | /* Attach toplevel qdisc to device queue. */ |
1103 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
1104 | struct Qdisc *qdisc) | |
1105 | { | |
1106 | struct Qdisc *oqdisc = dev_queue->qdisc_sleeping; | |
1107 | spinlock_t *root_lock; | |
1108 | ||
1109 | root_lock = qdisc_lock(oqdisc); | |
1110 | spin_lock_bh(root_lock); | |
1111 | ||
589983cd PM |
1112 | /* ... and graft new one */ |
1113 | if (qdisc == NULL) | |
1114 | qdisc = &noop_qdisc; | |
1115 | dev_queue->qdisc_sleeping = qdisc; | |
1116 | rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc); | |
1117 | ||
1118 | spin_unlock_bh(root_lock); | |
1119 | ||
1120 | return oqdisc; | |
1121 | } | |
b8970f0b | 1122 | EXPORT_SYMBOL(dev_graft_qdisc); |
589983cd | 1123 | |
f612466e WH |
1124 | static void shutdown_scheduler_queue(struct net_device *dev, |
1125 | struct netdev_queue *dev_queue, | |
1126 | void *_qdisc_default) | |
1127 | { | |
1128 | struct Qdisc *qdisc = dev_queue->qdisc_sleeping; | |
1129 | struct Qdisc *qdisc_default = _qdisc_default; | |
1130 | ||
1131 | if (qdisc) { | |
1132 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); | |
1133 | dev_queue->qdisc_sleeping = qdisc_default; | |
1134 | ||
1135 | qdisc_put(qdisc); | |
1136 | } | |
1137 | } | |
1138 | ||
e8a0464c DM |
1139 | static void attach_one_default_qdisc(struct net_device *dev, |
1140 | struct netdev_queue *dev_queue, | |
1141 | void *_unused) | |
1142 | { | |
3e692f21 PS |
1143 | struct Qdisc *qdisc; |
1144 | const struct Qdisc_ops *ops = default_qdisc_ops; | |
e8a0464c | 1145 | |
3e692f21 PS |
1146 | if (dev->priv_flags & IFF_NO_QUEUE) |
1147 | ops = &noqueue_qdisc_ops; | |
546b85bb VP |
1148 | else if(dev->type == ARPHRD_CAN) |
1149 | ops = &pfifo_fast_ops; | |
3e692f21 | 1150 | |
a38a9882 | 1151 | qdisc = qdisc_create_dflt(dev_queue, ops, TC_H_ROOT, NULL); |
bf6dba76 | 1152 | if (!qdisc) |
3e692f21 | 1153 | return; |
bf6dba76 | 1154 | |
3e692f21 | 1155 | if (!netif_is_multiqueue(dev)) |
4eaf3b84 | 1156 | qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; |
e8a0464c DM |
1157 | dev_queue->qdisc_sleeping = qdisc; |
1158 | } | |
1159 | ||
6ec1c69a DM |
1160 | static void attach_default_qdiscs(struct net_device *dev) |
1161 | { | |
1162 | struct netdev_queue *txq; | |
1163 | struct Qdisc *qdisc; | |
1164 | ||
1165 | txq = netdev_get_tx_queue(dev, 0); | |
1166 | ||
4b469955 | 1167 | if (!netif_is_multiqueue(dev) || |
4b469955 | 1168 | dev->priv_flags & IFF_NO_QUEUE) { |
6ec1c69a | 1169 | netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL); |
5891cd5e ED |
1170 | qdisc = txq->qdisc_sleeping; |
1171 | rcu_assign_pointer(dev->qdisc, qdisc); | |
1172 | qdisc_refcount_inc(qdisc); | |
6ec1c69a | 1173 | } else { |
a38a9882 | 1174 | qdisc = qdisc_create_dflt(txq, &mq_qdisc_ops, TC_H_ROOT, NULL); |
6ec1c69a | 1175 | if (qdisc) { |
5891cd5e | 1176 | rcu_assign_pointer(dev->qdisc, qdisc); |
e57a784d | 1177 | qdisc->ops->attach(qdisc); |
6ec1c69a DM |
1178 | } |
1179 | } | |
5891cd5e | 1180 | qdisc = rtnl_dereference(dev->qdisc); |
bf6dba76 JDB |
1181 | |
1182 | /* Detect default qdisc setup/init failed and fallback to "noqueue" */ | |
5891cd5e | 1183 | if (qdisc == &noop_qdisc) { |
bf6dba76 JDB |
1184 | netdev_warn(dev, "default qdisc (%s) fail, fallback to %s\n", |
1185 | default_qdisc_ops->id, noqueue_qdisc_ops.id); | |
f612466e | 1186 | netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc); |
bf6dba76 JDB |
1187 | dev->priv_flags |= IFF_NO_QUEUE; |
1188 | netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL); | |
5891cd5e ED |
1189 | qdisc = txq->qdisc_sleeping; |
1190 | rcu_assign_pointer(dev->qdisc, qdisc); | |
1191 | qdisc_refcount_inc(qdisc); | |
bf6dba76 JDB |
1192 | dev->priv_flags ^= IFF_NO_QUEUE; |
1193 | } | |
1194 | ||
59cc1f61 | 1195 | #ifdef CONFIG_NET_SCHED |
5891cd5e ED |
1196 | if (qdisc != &noop_qdisc) |
1197 | qdisc_hash_add(qdisc, false); | |
59cc1f61 | 1198 | #endif |
6ec1c69a DM |
1199 | } |
1200 | ||
e8a0464c DM |
1201 | static void transition_one_qdisc(struct net_device *dev, |
1202 | struct netdev_queue *dev_queue, | |
1203 | void *_need_watchdog) | |
1204 | { | |
83874000 | 1205 | struct Qdisc *new_qdisc = dev_queue->qdisc_sleeping; |
e8a0464c DM |
1206 | int *need_watchdog_p = _need_watchdog; |
1207 | ||
a9312ae8 DM |
1208 | if (!(new_qdisc->flags & TCQ_F_BUILTIN)) |
1209 | clear_bit(__QDISC_STATE_DEACTIVATED, &new_qdisc->state); | |
1210 | ||
83874000 | 1211 | rcu_assign_pointer(dev_queue->qdisc, new_qdisc); |
3e692f21 | 1212 | if (need_watchdog_p) { |
5337824f | 1213 | WRITE_ONCE(dev_queue->trans_start, 0); |
e8a0464c | 1214 | *need_watchdog_p = 1; |
9d21493b | 1215 | } |
e8a0464c DM |
1216 | } |
1217 | ||
1da177e4 LT |
1218 | void dev_activate(struct net_device *dev) |
1219 | { | |
e8a0464c | 1220 | int need_watchdog; |
b0e1e646 | 1221 | |
1da177e4 | 1222 | /* No queueing discipline is attached to device; |
6da7c8fc | 1223 | * create default one for devices, which need queueing |
1224 | * and noqueue_qdisc for virtual interfaces | |
1da177e4 LT |
1225 | */ |
1226 | ||
5891cd5e | 1227 | if (rtnl_dereference(dev->qdisc) == &noop_qdisc) |
6ec1c69a | 1228 | attach_default_qdiscs(dev); |
af356afa | 1229 | |
cacaddf5 TC |
1230 | if (!netif_carrier_ok(dev)) |
1231 | /* Delay activation until next carrier-on event */ | |
1232 | return; | |
1233 | ||
e8a0464c DM |
1234 | need_watchdog = 0; |
1235 | netdev_for_each_tx_queue(dev, transition_one_qdisc, &need_watchdog); | |
24824a09 ED |
1236 | if (dev_ingress_queue(dev)) |
1237 | transition_one_qdisc(dev, dev_ingress_queue(dev), NULL); | |
e8a0464c DM |
1238 | |
1239 | if (need_watchdog) { | |
860e9538 | 1240 | netif_trans_update(dev); |
1da177e4 LT |
1241 | dev_watchdog_up(dev); |
1242 | } | |
b0e1e646 | 1243 | } |
b8970f0b | 1244 | EXPORT_SYMBOL(dev_activate); |
b0e1e646 | 1245 | |
70f50965 CW |
1246 | static void qdisc_deactivate(struct Qdisc *qdisc) |
1247 | { | |
70f50965 CW |
1248 | if (qdisc->flags & TCQ_F_BUILTIN) |
1249 | return; | |
70f50965 CW |
1250 | |
1251 | set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state); | |
70f50965 CW |
1252 | } |
1253 | ||
e8a0464c DM |
1254 | static void dev_deactivate_queue(struct net_device *dev, |
1255 | struct netdev_queue *dev_queue, | |
1256 | void *_qdisc_default) | |
b0e1e646 | 1257 | { |
e8a0464c | 1258 | struct Qdisc *qdisc_default = _qdisc_default; |
970565bb | 1259 | struct Qdisc *qdisc; |
970565bb | 1260 | |
46e5da40 | 1261 | qdisc = rtnl_dereference(dev_queue->qdisc); |
b0e1e646 | 1262 | if (qdisc) { |
70f50965 | 1263 | qdisc_deactivate(qdisc); |
f7a54c13 | 1264 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
b0e1e646 | 1265 | } |
1da177e4 LT |
1266 | } |
1267 | ||
2fb541c8 YL |
1268 | static void dev_reset_queue(struct net_device *dev, |
1269 | struct netdev_queue *dev_queue, | |
1270 | void *_unused) | |
1271 | { | |
1272 | struct Qdisc *qdisc; | |
1273 | bool nolock; | |
1274 | ||
1275 | qdisc = dev_queue->qdisc_sleeping; | |
1276 | if (!qdisc) | |
1277 | return; | |
1278 | ||
1279 | nolock = qdisc->flags & TCQ_F_NOLOCK; | |
1280 | ||
1281 | if (nolock) | |
1282 | spin_lock_bh(&qdisc->seqlock); | |
1283 | spin_lock_bh(qdisc_lock(qdisc)); | |
1284 | ||
1285 | qdisc_reset(qdisc); | |
1286 | ||
1287 | spin_unlock_bh(qdisc_lock(qdisc)); | |
102b55ee YL |
1288 | if (nolock) { |
1289 | clear_bit(__QDISC_STATE_MISSED, &qdisc->state); | |
c4fef01b | 1290 | clear_bit(__QDISC_STATE_DRAINING, &qdisc->state); |
2fb541c8 | 1291 | spin_unlock_bh(&qdisc->seqlock); |
102b55ee | 1292 | } |
2fb541c8 YL |
1293 | } |
1294 | ||
4335cd2d | 1295 | static bool some_qdisc_is_busy(struct net_device *dev) |
e8a0464c DM |
1296 | { |
1297 | unsigned int i; | |
1298 | ||
1299 | for (i = 0; i < dev->num_tx_queues; i++) { | |
1300 | struct netdev_queue *dev_queue; | |
7698b4fc | 1301 | spinlock_t *root_lock; |
e2627c8c | 1302 | struct Qdisc *q; |
e8a0464c DM |
1303 | int val; |
1304 | ||
1305 | dev_queue = netdev_get_tx_queue(dev, i); | |
b9a3b110 | 1306 | q = dev_queue->qdisc_sleeping; |
e8a0464c | 1307 | |
32f7b44d PA |
1308 | root_lock = qdisc_lock(q); |
1309 | spin_lock_bh(root_lock); | |
e8a0464c | 1310 | |
32f7b44d PA |
1311 | val = (qdisc_is_running(q) || |
1312 | test_bit(__QDISC_STATE_SCHED, &q->state)); | |
e8a0464c | 1313 | |
32f7b44d | 1314 | spin_unlock_bh(root_lock); |
e8a0464c DM |
1315 | |
1316 | if (val) | |
1317 | return true; | |
1318 | } | |
1319 | return false; | |
1320 | } | |
1321 | ||
3137663d ED |
1322 | /** |
1323 | * dev_deactivate_many - deactivate transmissions on several devices | |
1324 | * @head: list of devices to deactivate | |
1325 | * | |
1326 | * This function returns only when all outstanding transmissions | |
1327 | * have completed, unless all devices are in dismantle phase. | |
1328 | */ | |
44345724 | 1329 | void dev_deactivate_many(struct list_head *head) |
1da177e4 | 1330 | { |
44345724 | 1331 | struct net_device *dev; |
41a23b07 | 1332 | |
5cde2829 | 1333 | list_for_each_entry(dev, head, close_list) { |
44345724 OP |
1334 | netdev_for_each_tx_queue(dev, dev_deactivate_queue, |
1335 | &noop_qdisc); | |
1336 | if (dev_ingress_queue(dev)) | |
1337 | dev_deactivate_queue(dev, dev_ingress_queue(dev), | |
1338 | &noop_qdisc); | |
1339 | ||
1340 | dev_watchdog_down(dev); | |
1341 | } | |
1da177e4 | 1342 | |
2fb541c8 YL |
1343 | /* Wait for outstanding qdisc-less dev_queue_xmit calls or |
1344 | * outstanding qdisc enqueuing calls. | |
3137663d ED |
1345 | * This is avoided if all devices are in dismantle phase : |
1346 | * Caller will call synchronize_net() for us | |
1347 | */ | |
7bbde83b | 1348 | synchronize_net(); |
1da177e4 | 1349 | |
2fb541c8 YL |
1350 | list_for_each_entry(dev, head, close_list) { |
1351 | netdev_for_each_tx_queue(dev, dev_reset_queue, NULL); | |
1352 | ||
1353 | if (dev_ingress_queue(dev)) | |
1354 | dev_reset_queue(dev, dev_ingress_queue(dev), NULL); | |
1355 | } | |
1356 | ||
d4828d85 | 1357 | /* Wait for outstanding qdisc_run calls. */ |
7bbde83b | 1358 | list_for_each_entry(dev, head, close_list) { |
4eab421b MKB |
1359 | while (some_qdisc_is_busy(dev)) { |
1360 | /* wait_event() would avoid this sleep-loop but would | |
1361 | * require expensive checks in the fast paths of packet | |
1362 | * processing which isn't worth it. | |
1363 | */ | |
1364 | schedule_timeout_uninterruptible(1); | |
1365 | } | |
7bbde83b | 1366 | } |
44345724 OP |
1367 | } |
1368 | ||
1369 | void dev_deactivate(struct net_device *dev) | |
1370 | { | |
1371 | LIST_HEAD(single); | |
1372 | ||
5cde2829 | 1373 | list_add(&dev->close_list, &single); |
44345724 | 1374 | dev_deactivate_many(&single); |
5f04d506 | 1375 | list_del(&single); |
1da177e4 | 1376 | } |
b8970f0b | 1377 | EXPORT_SYMBOL(dev_deactivate); |
1da177e4 | 1378 | |
48bfd55e CW |
1379 | static int qdisc_change_tx_queue_len(struct net_device *dev, |
1380 | struct netdev_queue *dev_queue) | |
1381 | { | |
1382 | struct Qdisc *qdisc = dev_queue->qdisc_sleeping; | |
1383 | const struct Qdisc_ops *ops = qdisc->ops; | |
1384 | ||
1385 | if (ops->change_tx_queue_len) | |
1386 | return ops->change_tx_queue_len(qdisc, dev->tx_queue_len); | |
1387 | return 0; | |
1388 | } | |
1389 | ||
1e080f17 JK |
1390 | void dev_qdisc_change_real_num_tx(struct net_device *dev, |
1391 | unsigned int new_real_tx) | |
1392 | { | |
5891cd5e | 1393 | struct Qdisc *qdisc = rtnl_dereference(dev->qdisc); |
1e080f17 JK |
1394 | |
1395 | if (qdisc->ops->change_real_num_tx) | |
1396 | qdisc->ops->change_real_num_tx(qdisc, new_real_tx); | |
1397 | } | |
1398 | ||
f7116fb4 JK |
1399 | void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx) |
1400 | { | |
1401 | #ifdef CONFIG_NET_SCHED | |
1402 | struct net_device *dev = qdisc_dev(sch); | |
1403 | struct Qdisc *qdisc; | |
1404 | unsigned int i; | |
1405 | ||
1406 | for (i = new_real_tx; i < dev->real_num_tx_queues; i++) { | |
1407 | qdisc = netdev_get_tx_queue(dev, i)->qdisc_sleeping; | |
1408 | /* Only update the default qdiscs we created, | |
1409 | * qdiscs with handles are always hashed. | |
1410 | */ | |
1411 | if (qdisc != &noop_qdisc && !qdisc->handle) | |
1412 | qdisc_hash_del(qdisc); | |
1413 | } | |
1414 | for (i = dev->real_num_tx_queues; i < new_real_tx; i++) { | |
1415 | qdisc = netdev_get_tx_queue(dev, i)->qdisc_sleeping; | |
1416 | if (qdisc != &noop_qdisc && !qdisc->handle) | |
1417 | qdisc_hash_add(qdisc, false); | |
1418 | } | |
1419 | #endif | |
1420 | } | |
1421 | EXPORT_SYMBOL(mq_change_real_num_tx); | |
1422 | ||
48bfd55e CW |
1423 | int dev_qdisc_change_tx_queue_len(struct net_device *dev) |
1424 | { | |
1425 | bool up = dev->flags & IFF_UP; | |
1426 | unsigned int i; | |
1427 | int ret = 0; | |
1428 | ||
1429 | if (up) | |
1430 | dev_deactivate(dev); | |
1431 | ||
1432 | for (i = 0; i < dev->num_tx_queues; i++) { | |
1433 | ret = qdisc_change_tx_queue_len(dev, &dev->_tx[i]); | |
1434 | ||
1435 | /* TODO: revert changes on a partial failure */ | |
1436 | if (ret) | |
1437 | break; | |
1438 | } | |
1439 | ||
1440 | if (up) | |
1441 | dev_activate(dev); | |
1442 | return ret; | |
1443 | } | |
1444 | ||
b0e1e646 DM |
1445 | static void dev_init_scheduler_queue(struct net_device *dev, |
1446 | struct netdev_queue *dev_queue, | |
e8a0464c | 1447 | void *_qdisc) |
b0e1e646 | 1448 | { |
e8a0464c DM |
1449 | struct Qdisc *qdisc = _qdisc; |
1450 | ||
46e5da40 | 1451 | rcu_assign_pointer(dev_queue->qdisc, qdisc); |
b0e1e646 | 1452 | dev_queue->qdisc_sleeping = qdisc; |
b0e1e646 DM |
1453 | } |
1454 | ||
1da177e4 LT |
1455 | void dev_init_scheduler(struct net_device *dev) |
1456 | { | |
5891cd5e | 1457 | rcu_assign_pointer(dev->qdisc, &noop_qdisc); |
e8a0464c | 1458 | netdev_for_each_tx_queue(dev, dev_init_scheduler_queue, &noop_qdisc); |
24824a09 ED |
1459 | if (dev_ingress_queue(dev)) |
1460 | dev_init_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); | |
1da177e4 | 1461 | |
cdeabbb8 | 1462 | timer_setup(&dev->watchdog_timer, dev_watchdog, 0); |
1da177e4 LT |
1463 | } |
1464 | ||
b0e1e646 DM |
1465 | void dev_shutdown(struct net_device *dev) |
1466 | { | |
e8a0464c | 1467 | netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc); |
24824a09 ED |
1468 | if (dev_ingress_queue(dev)) |
1469 | shutdown_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); | |
5891cd5e ED |
1470 | qdisc_put(rtnl_dereference(dev->qdisc)); |
1471 | rcu_assign_pointer(dev->qdisc, &noop_qdisc); | |
af356afa | 1472 | |
547b792c | 1473 | WARN_ON(timer_pending(&dev->watchdog_timer)); |
1da177e4 | 1474 | } |
292f1c7f | 1475 | |
2ffe0395 BZ |
1476 | /** |
1477 | * psched_ratecfg_precompute__() - Pre-compute values for reciprocal division | |
1478 | * @rate: Rate to compute reciprocal division values of | |
1479 | * @mult: Multiplier for reciprocal division | |
1480 | * @shift: Shift for reciprocal division | |
1481 | * | |
1482 | * The multiplier and shift for reciprocal division by rate are stored | |
1483 | * in mult and shift. | |
1484 | * | |
1485 | * The deal here is to replace a divide by a reciprocal one | |
1486 | * in fast path (a reciprocal divide is a multiply and a shift) | |
1487 | * | |
1488 | * Normal formula would be : | |
1489 | * time_in_ns = (NSEC_PER_SEC * len) / rate_bps | |
1490 | * | |
1491 | * We compute mult/shift to use instead : | |
1492 | * time_in_ns = (len * mult) >> shift; | |
1493 | * | |
1494 | * We try to get the highest possible mult value for accuracy, | |
1495 | * but have to make sure no overflows will ever happen. | |
1496 | * | |
1497 | * reciprocal_value() is not used here it doesn't handle 64-bit values. | |
1498 | */ | |
1499 | static void psched_ratecfg_precompute__(u64 rate, u32 *mult, u8 *shift) | |
1500 | { | |
1501 | u64 factor = NSEC_PER_SEC; | |
1502 | ||
1503 | *mult = 1; | |
1504 | *shift = 0; | |
1505 | ||
1506 | if (rate <= 0) | |
1507 | return; | |
1508 | ||
1509 | for (;;) { | |
1510 | *mult = div64_u64(factor, rate); | |
1511 | if (*mult & (1U << 31) || factor & (1ULL << 63)) | |
1512 | break; | |
1513 | factor <<= 1; | |
1514 | (*shift)++; | |
1515 | } | |
1516 | } | |
1517 | ||
01cb71d2 | 1518 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
1519 | const struct tc_ratespec *conf, |
1520 | u64 rate64) | |
292f1c7f | 1521 | { |
01cb71d2 ED |
1522 | memset(r, 0, sizeof(*r)); |
1523 | r->overhead = conf->overhead; | |
fb80445c | 1524 | r->mpu = conf->mpu; |
3e1e3aae | 1525 | r->rate_bytes_ps = max_t(u64, conf->rate, rate64); |
8a8e3d84 | 1526 | r->linklayer = (conf->linklayer & TC_LINKLAYER_MASK); |
2ffe0395 | 1527 | psched_ratecfg_precompute__(r->rate_bytes_ps, &r->mult, &r->shift); |
292f1c7f JP |
1528 | } |
1529 | EXPORT_SYMBOL(psched_ratecfg_precompute); | |
46209401 | 1530 | |
2ffe0395 BZ |
1531 | void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64) |
1532 | { | |
1533 | r->rate_pkts_ps = pktrate64; | |
1534 | psched_ratecfg_precompute__(r->rate_pkts_ps, &r->mult, &r->shift); | |
1535 | } | |
1536 | EXPORT_SYMBOL(psched_ppscfg_precompute); | |
1537 | ||
46209401 JP |
1538 | void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, |
1539 | struct tcf_proto *tp_head) | |
1540 | { | |
ed76f5ed VB |
1541 | /* Protected with chain0->filter_chain_lock. |
1542 | * Can't access chain directly because tp_head can be NULL. | |
1543 | */ | |
1544 | struct mini_Qdisc *miniq_old = | |
1545 | rcu_dereference_protected(*miniqp->p_miniq, 1); | |
46209401 JP |
1546 | struct mini_Qdisc *miniq; |
1547 | ||
1548 | if (!tp_head) { | |
1549 | RCU_INIT_POINTER(*miniqp->p_miniq, NULL); | |
26746382 | 1550 | } else { |
85c0c3eb | 1551 | miniq = miniq_old != &miniqp->miniq1 ? |
26746382 | 1552 | &miniqp->miniq1 : &miniqp->miniq2; |
46209401 | 1553 | |
26746382 SF |
1554 | /* We need to make sure that readers won't see the miniq |
1555 | * we are about to modify. So ensure that at least one RCU | |
1556 | * grace period has elapsed since the miniq was made | |
1557 | * inactive. | |
1558 | */ | |
1559 | if (IS_ENABLED(CONFIG_PREEMPT_RT)) | |
1560 | cond_synchronize_rcu(miniq->rcu_state); | |
1561 | else if (!poll_state_synchronize_rcu(miniq->rcu_state)) | |
1562 | synchronize_rcu_expedited(); | |
46209401 | 1563 | |
26746382 SF |
1564 | miniq->filter_list = tp_head; |
1565 | rcu_assign_pointer(*miniqp->p_miniq, miniq); | |
1566 | } | |
46209401 JP |
1567 | |
1568 | if (miniq_old) | |
26746382 | 1569 | /* This is counterpart of the rcu sync above. We need to |
46209401 JP |
1570 | * block potential new user of miniq_old until all readers |
1571 | * are not seeing it. | |
1572 | */ | |
26746382 | 1573 | miniq_old->rcu_state = start_poll_synchronize_rcu(); |
46209401 JP |
1574 | } |
1575 | EXPORT_SYMBOL(mini_qdisc_pair_swap); | |
1576 | ||
7d17c544 PB |
1577 | void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp, |
1578 | struct tcf_block *block) | |
1579 | { | |
1580 | miniqp->miniq1.block = block; | |
1581 | miniqp->miniq2.block = block; | |
1582 | } | |
1583 | EXPORT_SYMBOL(mini_qdisc_pair_block_init); | |
1584 | ||
46209401 JP |
1585 | void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, |
1586 | struct mini_Qdisc __rcu **p_miniq) | |
1587 | { | |
1588 | miniqp->miniq1.cpu_bstats = qdisc->cpu_bstats; | |
1589 | miniqp->miniq1.cpu_qstats = qdisc->cpu_qstats; | |
1590 | miniqp->miniq2.cpu_bstats = qdisc->cpu_bstats; | |
1591 | miniqp->miniq2.cpu_qstats = qdisc->cpu_qstats; | |
26746382 SF |
1592 | miniqp->miniq1.rcu_state = get_state_synchronize_rcu(); |
1593 | miniqp->miniq2.rcu_state = miniqp->miniq1.rcu_state; | |
46209401 JP |
1594 | miniqp->p_miniq = p_miniq; |
1595 | } | |
1596 | EXPORT_SYMBOL(mini_qdisc_pair_init); |