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> |
26722dc7 | 30 | #include <net/hotdata.h> |
e543002f | 31 | #include <trace/events/qdisc.h> |
141b6b2a | 32 | #include <trace/events/net.h> |
f53c7239 | 33 | #include <net/xfrm.h> |
1da177e4 | 34 | |
34aedd3f | 35 | /* Qdisc to use by default */ |
36 | const struct Qdisc_ops *default_qdisc_ops = &pfifo_fast_ops; | |
37 | EXPORT_SYMBOL(default_qdisc_ops); | |
38 | ||
dcad9ee9 YL |
39 | static void qdisc_maybe_clear_missed(struct Qdisc *q, |
40 | const struct netdev_queue *txq) | |
41 | { | |
42 | clear_bit(__QDISC_STATE_MISSED, &q->state); | |
43 | ||
44 | /* Make sure the below netif_xmit_frozen_or_stopped() | |
45 | * checking happens after clearing STATE_MISSED. | |
46 | */ | |
47 | smp_mb__after_atomic(); | |
48 | ||
49 | /* Checking netif_xmit_frozen_or_stopped() again to | |
50 | * make sure STATE_MISSED is set if the STATE_MISSED | |
51 | * set by netif_tx_wake_queue()'s rescheduling of | |
52 | * net_tx_action() is cleared by the above clear_bit(). | |
53 | */ | |
54 | if (!netif_xmit_frozen_or_stopped(txq)) | |
55 | set_bit(__QDISC_STATE_MISSED, &q->state); | |
c4fef01b YL |
56 | else |
57 | set_bit(__QDISC_STATE_DRAINING, &q->state); | |
dcad9ee9 YL |
58 | } |
59 | ||
1da177e4 LT |
60 | /* Main transmission queue. */ |
61 | ||
0463d4ae | 62 | /* Modifications to data participating in scheduling must be protected with |
5fb66229 | 63 | * qdisc_lock(qdisc) spinlock. |
0463d4ae PM |
64 | * |
65 | * The idea is the following: | |
c7e4f3bb DM |
66 | * - enqueue, dequeue are serialized via qdisc root lock |
67 | * - ingress filtering is also serialized via qdisc root lock | |
0463d4ae | 68 | * - updates to tree and tree walking are only done under the rtnl mutex. |
1da177e4 | 69 | */ |
70e57d5e | 70 | |
b88dd52c ED |
71 | #define SKB_XOFF_MAGIC ((struct sk_buff *)1UL) |
72 | ||
70e57d5e JF |
73 | static inline struct sk_buff *__skb_dequeue_bad_txq(struct Qdisc *q) |
74 | { | |
75 | const struct netdev_queue *txq = q->dev_queue; | |
76 | spinlock_t *lock = NULL; | |
77 | struct sk_buff *skb; | |
78 | ||
79 | if (q->flags & TCQ_F_NOLOCK) { | |
80 | lock = qdisc_lock(q); | |
81 | spin_lock(lock); | |
82 | } | |
83 | ||
84 | skb = skb_peek(&q->skb_bad_txq); | |
85 | if (skb) { | |
86 | /* check the reason of requeuing without tx lock first */ | |
87 | txq = skb_get_tx_queue(txq->dev, skb); | |
88 | if (!netif_xmit_frozen_or_stopped(txq)) { | |
89 | skb = __skb_dequeue(&q->skb_bad_txq); | |
90 | if (qdisc_is_percpu_stats(q)) { | |
91 | qdisc_qstats_cpu_backlog_dec(q, skb); | |
73eb628d | 92 | qdisc_qstats_cpu_qlen_dec(q); |
70e57d5e JF |
93 | } else { |
94 | qdisc_qstats_backlog_dec(q, skb); | |
95 | q->q.qlen--; | |
96 | } | |
97 | } else { | |
b88dd52c | 98 | skb = SKB_XOFF_MAGIC; |
dcad9ee9 | 99 | qdisc_maybe_clear_missed(q, txq); |
70e57d5e JF |
100 | } |
101 | } | |
102 | ||
103 | if (lock) | |
104 | spin_unlock(lock); | |
105 | ||
106 | return skb; | |
107 | } | |
108 | ||
109 | static inline struct sk_buff *qdisc_dequeue_skb_bad_txq(struct Qdisc *q) | |
110 | { | |
111 | struct sk_buff *skb = skb_peek(&q->skb_bad_txq); | |
112 | ||
113 | if (unlikely(skb)) | |
114 | skb = __skb_dequeue_bad_txq(q); | |
115 | ||
116 | return skb; | |
117 | } | |
118 | ||
119 | static inline void qdisc_enqueue_skb_bad_txq(struct Qdisc *q, | |
120 | struct sk_buff *skb) | |
121 | { | |
122 | spinlock_t *lock = NULL; | |
123 | ||
124 | if (q->flags & TCQ_F_NOLOCK) { | |
125 | lock = qdisc_lock(q); | |
126 | spin_lock(lock); | |
127 | } | |
128 | ||
129 | __skb_queue_tail(&q->skb_bad_txq, skb); | |
130 | ||
cce6294c ED |
131 | if (qdisc_is_percpu_stats(q)) { |
132 | qdisc_qstats_cpu_backlog_inc(q, skb); | |
73eb628d | 133 | qdisc_qstats_cpu_qlen_inc(q); |
cce6294c ED |
134 | } else { |
135 | qdisc_qstats_backlog_inc(q, skb); | |
136 | q->q.qlen++; | |
137 | } | |
138 | ||
70e57d5e JF |
139 | if (lock) |
140 | spin_unlock(lock); | |
141 | } | |
142 | ||
9c01c9f1 | 143 | static inline void dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q) |
c716a81a | 144 | { |
9c01c9f1 | 145 | spinlock_t *lock = NULL; |
9540d977 | 146 | |
9c01c9f1 PA |
147 | if (q->flags & TCQ_F_NOLOCK) { |
148 | lock = qdisc_lock(q); | |
149 | spin_lock(lock); | |
9540d977 | 150 | } |
c716a81a | 151 | |
9540d977 WY |
152 | while (skb) { |
153 | struct sk_buff *next = skb->next; | |
154 | ||
155 | __skb_queue_tail(&q->gso_skb, skb); | |
156 | ||
9c01c9f1 PA |
157 | /* it's still part of the queue */ |
158 | if (qdisc_is_percpu_stats(q)) { | |
159 | qdisc_qstats_cpu_requeues_inc(q); | |
160 | qdisc_qstats_cpu_backlog_inc(q, skb); | |
73eb628d | 161 | qdisc_qstats_cpu_qlen_inc(q); |
9c01c9f1 PA |
162 | } else { |
163 | q->qstats.requeues++; | |
164 | qdisc_qstats_backlog_inc(q, skb); | |
165 | q->q.qlen++; | |
166 | } | |
9540d977 WY |
167 | |
168 | skb = next; | |
169 | } | |
c4fef01b YL |
170 | |
171 | if (lock) { | |
9c01c9f1 | 172 | spin_unlock(lock); |
c4fef01b YL |
173 | set_bit(__QDISC_STATE_MISSED, &q->state); |
174 | } else { | |
175 | __netif_schedule(q); | |
176 | } | |
a53851e2 JF |
177 | } |
178 | ||
55a93b3e ED |
179 | static void try_bulk_dequeue_skb(struct Qdisc *q, |
180 | struct sk_buff *skb, | |
b8358d70 JDB |
181 | const struct netdev_queue *txq, |
182 | int *packets) | |
5772e9a3 | 183 | { |
55a93b3e | 184 | int bytelimit = qdisc_avail_bulklimit(txq) - skb->len; |
5772e9a3 JDB |
185 | |
186 | while (bytelimit > 0) { | |
55a93b3e | 187 | struct sk_buff *nskb = q->dequeue(q); |
5772e9a3 | 188 | |
55a93b3e | 189 | if (!nskb) |
5772e9a3 JDB |
190 | break; |
191 | ||
55a93b3e ED |
192 | bytelimit -= nskb->len; /* covers GSO len */ |
193 | skb->next = nskb; | |
194 | skb = nskb; | |
b8358d70 | 195 | (*packets)++; /* GSO counts as one pkt */ |
5772e9a3 | 196 | } |
a8305bff | 197 | skb_mark_not_on_list(skb); |
5772e9a3 JDB |
198 | } |
199 | ||
4d202a0d ED |
200 | /* This variant of try_bulk_dequeue_skb() makes sure |
201 | * all skbs in the chain are for the same txq | |
202 | */ | |
203 | static void try_bulk_dequeue_skb_slow(struct Qdisc *q, | |
204 | struct sk_buff *skb, | |
205 | int *packets) | |
206 | { | |
207 | int mapping = skb_get_queue_mapping(skb); | |
208 | struct sk_buff *nskb; | |
209 | int cnt = 0; | |
210 | ||
211 | do { | |
212 | nskb = q->dequeue(q); | |
213 | if (!nskb) | |
214 | break; | |
215 | if (unlikely(skb_get_queue_mapping(nskb) != mapping)) { | |
70e57d5e | 216 | qdisc_enqueue_skb_bad_txq(q, nskb); |
4d202a0d ED |
217 | break; |
218 | } | |
219 | skb->next = nskb; | |
220 | skb = nskb; | |
221 | } while (++cnt < 8); | |
222 | (*packets) += cnt; | |
a8305bff | 223 | skb_mark_not_on_list(skb); |
4d202a0d ED |
224 | } |
225 | ||
5772e9a3 JDB |
226 | /* Note that dequeue_skb can possibly return a SKB list (via skb->next). |
227 | * A requeued skb (via q->gso_skb) can also be a SKB list. | |
228 | */ | |
b8358d70 JDB |
229 | static struct sk_buff *dequeue_skb(struct Qdisc *q, bool *validate, |
230 | int *packets) | |
c716a81a | 231 | { |
1abbe139 | 232 | const struct netdev_queue *txq = q->dev_queue; |
fd8e8d1a | 233 | struct sk_buff *skb = NULL; |
554794de | 234 | |
b8358d70 | 235 | *packets = 1; |
a53851e2 JF |
236 | if (unlikely(!skb_queue_empty(&q->gso_skb))) { |
237 | spinlock_t *lock = NULL; | |
238 | ||
239 | if (q->flags & TCQ_F_NOLOCK) { | |
240 | lock = qdisc_lock(q); | |
241 | spin_lock(lock); | |
242 | } | |
243 | ||
244 | skb = skb_peek(&q->gso_skb); | |
245 | ||
246 | /* skb may be null if another cpu pulls gso_skb off in between | |
247 | * empty check and lock. | |
248 | */ | |
249 | if (!skb) { | |
250 | if (lock) | |
251 | spin_unlock(lock); | |
252 | goto validate; | |
253 | } | |
254 | ||
4d202a0d ED |
255 | /* skb in gso_skb were already validated */ |
256 | *validate = false; | |
f53c7239 SK |
257 | if (xfrm_offload(skb)) |
258 | *validate = true; | |
ebf05982 | 259 | /* check the reason of requeuing without tx lock first */ |
10c51b56 | 260 | txq = skb_get_tx_queue(txq->dev, skb); |
73466498 | 261 | if (!netif_xmit_frozen_or_stopped(txq)) { |
a53851e2 JF |
262 | skb = __skb_dequeue(&q->gso_skb); |
263 | if (qdisc_is_percpu_stats(q)) { | |
264 | qdisc_qstats_cpu_backlog_dec(q, skb); | |
73eb628d | 265 | qdisc_qstats_cpu_qlen_dec(q); |
a53851e2 JF |
266 | } else { |
267 | qdisc_qstats_backlog_dec(q, skb); | |
268 | q->q.qlen--; | |
269 | } | |
270 | } else { | |
ebf05982 | 271 | skb = NULL; |
dcad9ee9 | 272 | qdisc_maybe_clear_missed(q, txq); |
a53851e2 JF |
273 | } |
274 | if (lock) | |
275 | spin_unlock(lock); | |
e543002f | 276 | goto trace; |
4d202a0d | 277 | } |
a53851e2 | 278 | validate: |
4d202a0d | 279 | *validate = true; |
fd8e8d1a JF |
280 | |
281 | if ((q->flags & TCQ_F_ONETXQUEUE) && | |
dcad9ee9 YL |
282 | netif_xmit_frozen_or_stopped(txq)) { |
283 | qdisc_maybe_clear_missed(q, txq); | |
fd8e8d1a | 284 | return skb; |
dcad9ee9 | 285 | } |
fd8e8d1a | 286 | |
70e57d5e | 287 | skb = qdisc_dequeue_skb_bad_txq(q); |
b88dd52c ED |
288 | if (unlikely(skb)) { |
289 | if (skb == SKB_XOFF_MAGIC) | |
290 | return NULL; | |
70e57d5e | 291 | goto bulk; |
b88dd52c | 292 | } |
fd8e8d1a | 293 | skb = q->dequeue(q); |
4d202a0d ED |
294 | if (skb) { |
295 | bulk: | |
296 | if (qdisc_may_bulk(q)) | |
297 | try_bulk_dequeue_skb(q, skb, txq, packets); | |
298 | else | |
299 | try_bulk_dequeue_skb_slow(q, skb, packets); | |
ebf05982 | 300 | } |
e543002f JDB |
301 | trace: |
302 | trace_qdisc_dequeue(q, txq, *packets, skb); | |
c716a81a JHS |
303 | return skb; |
304 | } | |
305 | ||
10297b99 | 306 | /* |
10770bc2 | 307 | * Transmit possibly several skbs, and handle the return status as |
29cbcd85 AD |
308 | * required. Owning qdisc running bit guarantees that only one CPU |
309 | * can execute this function. | |
6c1361a6 KK |
310 | * |
311 | * Returns to the caller: | |
29b86cda JF |
312 | * false - hardware queue frozen backoff |
313 | * true - feel free to send more pkts | |
6c1361a6 | 314 | */ |
29b86cda JF |
315 | bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, |
316 | struct net_device *dev, struct netdev_queue *txq, | |
317 | spinlock_t *root_lock, bool validate) | |
1da177e4 | 318 | { |
5f1a485d | 319 | int ret = NETDEV_TX_BUSY; |
f53c7239 | 320 | bool again = false; |
7698b4fc DM |
321 | |
322 | /* And release qdisc */ | |
6b3ba914 JF |
323 | if (root_lock) |
324 | spin_unlock(root_lock); | |
c716a81a | 325 | |
55a93b3e ED |
326 | /* Note that we validate skb (GSO, checksum, ...) outside of locks */ |
327 | if (validate) | |
f53c7239 SK |
328 | skb = validate_xmit_skb_list(skb, dev, &again); |
329 | ||
330 | #ifdef CONFIG_XFRM_OFFLOAD | |
331 | if (unlikely(again)) { | |
332 | if (root_lock) | |
333 | spin_lock(root_lock); | |
334 | ||
335 | dev_requeue_skb(skb, q); | |
336 | return false; | |
337 | } | |
338 | #endif | |
572a9d7b | 339 | |
3dcd493f | 340 | if (likely(skb)) { |
55a93b3e ED |
341 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
342 | if (!netif_xmit_frozen_or_stopped(txq)) | |
343 | skb = dev_hard_start_xmit(skb, dev, txq, &ret); | |
dcad9ee9 YL |
344 | else |
345 | qdisc_maybe_clear_missed(q, txq); | |
c716a81a | 346 | |
55a93b3e | 347 | HARD_TX_UNLOCK(dev, txq); |
3dcd493f | 348 | } else { |
6b3ba914 JF |
349 | if (root_lock) |
350 | spin_lock(root_lock); | |
29b86cda | 351 | return true; |
55a93b3e | 352 | } |
6b3ba914 JF |
353 | |
354 | if (root_lock) | |
355 | spin_lock(root_lock); | |
c716a81a | 356 | |
29b86cda | 357 | if (!dev_xmit_complete(ret)) { |
6c1361a6 | 358 | /* Driver returned NETDEV_TX_BUSY - requeue skb */ |
e87cc472 JP |
359 | if (unlikely(ret != NETDEV_TX_BUSY)) |
360 | net_warn_ratelimited("BUG %s code %d qlen %d\n", | |
361 | dev->name, ret, q->q.qlen); | |
6c1361a6 | 362 | |
29b86cda JF |
363 | dev_requeue_skb(skb, q); |
364 | return false; | |
6c1361a6 | 365 | } |
c716a81a | 366 | |
29b86cda | 367 | return true; |
1da177e4 LT |
368 | } |
369 | ||
bbd8a0d3 KK |
370 | /* |
371 | * NOTE: Called under qdisc_lock(q) with locally disabled BH. | |
372 | * | |
f9eb8aea | 373 | * running seqcount guarantees only one CPU can process |
bbd8a0d3 KK |
374 | * this qdisc at a time. qdisc_lock(q) serializes queue accesses for |
375 | * this queue. | |
376 | * | |
377 | * netif_tx_lock serializes accesses to device driver. | |
378 | * | |
379 | * qdisc_lock(q) and netif_tx_lock are mutually exclusive, | |
380 | * if one is grabbed, another must be free. | |
381 | * | |
382 | * Note, that this procedure can be called by a watchdog timer | |
383 | * | |
384 | * Returns to the caller: | |
385 | * 0 - queue is empty or throttled. | |
386 | * >0 - queue is not empty. | |
387 | * | |
388 | */ | |
29b86cda | 389 | static inline bool qdisc_restart(struct Qdisc *q, int *packets) |
bbd8a0d3 | 390 | { |
6b3ba914 | 391 | spinlock_t *root_lock = NULL; |
bbd8a0d3 KK |
392 | struct netdev_queue *txq; |
393 | struct net_device *dev; | |
bbd8a0d3 | 394 | struct sk_buff *skb; |
32f7b44d | 395 | bool validate; |
bbd8a0d3 KK |
396 | |
397 | /* Dequeue packet */ | |
b8358d70 | 398 | skb = dequeue_skb(q, &validate, packets); |
32f7b44d | 399 | if (unlikely(!skb)) |
29b86cda | 400 | return false; |
10c51b56 | 401 | |
32f7b44d | 402 | if (!(q->flags & TCQ_F_NOLOCK)) |
6b3ba914 JF |
403 | root_lock = qdisc_lock(q); |
404 | ||
bbd8a0d3 | 405 | dev = qdisc_dev(q); |
10c51b56 | 406 | txq = skb_get_tx_queue(dev, skb); |
bbd8a0d3 | 407 | |
32f7b44d | 408 | return sch_direct_xmit(skb, q, dev, txq, root_lock, validate); |
bbd8a0d3 KK |
409 | } |
410 | ||
37437bb2 | 411 | void __qdisc_run(struct Qdisc *q) |
48d83325 | 412 | { |
26722dc7 | 413 | int quota = READ_ONCE(net_hotdata.dev_tx_weight); |
b8358d70 | 414 | int packets; |
2ba2506c | 415 | |
b8358d70 | 416 | while (qdisc_restart(q, &packets)) { |
b8358d70 | 417 | quota -= packets; |
b60fa1c5 | 418 | if (quota <= 0) { |
c4fef01b YL |
419 | if (q->flags & TCQ_F_NOLOCK) |
420 | set_bit(__QDISC_STATE_MISSED, &q->state); | |
421 | else | |
422 | __netif_schedule(q); | |
423 | ||
d90df3ad | 424 | break; |
2ba2506c HX |
425 | } |
426 | } | |
48d83325 HX |
427 | } |
428 | ||
9d21493b ED |
429 | unsigned long dev_trans_start(struct net_device *dev) |
430 | { | |
4873a1b2 VO |
431 | unsigned long res = READ_ONCE(netdev_get_tx_queue(dev, 0)->trans_start); |
432 | unsigned long val; | |
9d21493b ED |
433 | unsigned int i; |
434 | ||
9b36627a | 435 | for (i = 1; i < dev->num_tx_queues; i++) { |
5337824f | 436 | val = READ_ONCE(netdev_get_tx_queue(dev, i)->trans_start); |
9d21493b ED |
437 | if (val && time_after(val, res)) |
438 | res = val; | |
439 | } | |
07ce76aa | 440 | |
9d21493b ED |
441 | return res; |
442 | } | |
443 | EXPORT_SYMBOL(dev_trans_start); | |
444 | ||
dab8fe32 ED |
445 | static void netif_freeze_queues(struct net_device *dev) |
446 | { | |
447 | unsigned int i; | |
448 | int cpu; | |
449 | ||
450 | cpu = smp_processor_id(); | |
451 | for (i = 0; i < dev->num_tx_queues; i++) { | |
452 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
453 | ||
454 | /* We are the only thread of execution doing a | |
455 | * freeze, but we have to grab the _xmit_lock in | |
456 | * order to synchronize with threads which are in | |
457 | * the ->hard_start_xmit() handler and already | |
458 | * checked the frozen bit. | |
459 | */ | |
460 | __netif_tx_lock(txq, cpu); | |
461 | set_bit(__QUEUE_STATE_FROZEN, &txq->state); | |
462 | __netif_tx_unlock(txq); | |
463 | } | |
464 | } | |
465 | ||
466 | void netif_tx_lock(struct net_device *dev) | |
467 | { | |
468 | spin_lock(&dev->tx_global_lock); | |
469 | netif_freeze_queues(dev); | |
470 | } | |
471 | EXPORT_SYMBOL(netif_tx_lock); | |
472 | ||
473 | static void netif_unfreeze_queues(struct net_device *dev) | |
474 | { | |
475 | unsigned int i; | |
476 | ||
477 | for (i = 0; i < dev->num_tx_queues; i++) { | |
478 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
479 | ||
480 | /* No need to grab the _xmit_lock here. If the | |
481 | * queue is not stopped for another reason, we | |
482 | * force a schedule. | |
483 | */ | |
484 | clear_bit(__QUEUE_STATE_FROZEN, &txq->state); | |
485 | netif_schedule_queue(txq); | |
486 | } | |
487 | } | |
488 | ||
489 | void netif_tx_unlock(struct net_device *dev) | |
490 | { | |
491 | netif_unfreeze_queues(dev); | |
492 | spin_unlock(&dev->tx_global_lock); | |
493 | } | |
494 | EXPORT_SYMBOL(netif_tx_unlock); | |
495 | ||
cdeabbb8 | 496 | static void dev_watchdog(struct timer_list *t) |
1da177e4 | 497 | { |
cdeabbb8 | 498 | struct net_device *dev = from_timer(dev, t, watchdog_timer); |
f12bf6f3 | 499 | bool release = true; |
1da177e4 | 500 | |
bec251bc | 501 | spin_lock(&dev->tx_global_lock); |
e8a0464c | 502 | if (!qdisc_tx_is_noop(dev)) { |
1da177e4 LT |
503 | if (netif_device_present(dev) && |
504 | netif_running(dev) && | |
505 | netif_carrier_ok(dev)) { | |
2f0f9465 | 506 | unsigned int timedout_ms = 0; |
e8a0464c | 507 | unsigned int i; |
9d21493b | 508 | unsigned long trans_start; |
33fb988b | 509 | unsigned long oldest_start = jiffies; |
e8a0464c DM |
510 | |
511 | for (i = 0; i < dev->num_tx_queues; i++) { | |
512 | struct netdev_queue *txq; | |
513 | ||
514 | txq = netdev_get_tx_queue(dev, i); | |
5337824f | 515 | trans_start = READ_ONCE(txq->trans_start); |
33fb988b PKK |
516 | if (!netif_xmit_stopped(txq)) |
517 | continue; | |
518 | if (time_after(jiffies, trans_start + dev->watchdog_timeo)) { | |
2f0f9465 | 519 | timedout_ms = jiffies_to_msecs(jiffies - trans_start); |
8160fb43 | 520 | atomic_long_inc(&txq->trans_timeout); |
e8a0464c DM |
521 | break; |
522 | } | |
33fb988b PKK |
523 | if (time_after(oldest_start, trans_start)) |
524 | oldest_start = trans_start; | |
e8a0464c | 525 | } |
338f7566 | 526 | |
2f0f9465 | 527 | if (unlikely(timedout_ms)) { |
141b6b2a | 528 | trace_net_dev_xmit_timeout(dev, i); |
e316dd1c JK |
529 | netdev_crit(dev, "NETDEV WATCHDOG: CPU: %d: transmit queue %u timed out %u ms\n", |
530 | raw_smp_processor_id(), | |
531 | i, timedout_ms); | |
bec251bc | 532 | netif_freeze_queues(dev); |
0290bd29 | 533 | dev->netdev_ops->ndo_tx_timeout(dev, i); |
bec251bc | 534 | netif_unfreeze_queues(dev); |
1da177e4 | 535 | } |
e8a0464c | 536 | if (!mod_timer(&dev->watchdog_timer, |
33fb988b | 537 | round_jiffies(oldest_start + |
e8a0464c | 538 | dev->watchdog_timeo))) |
f12bf6f3 | 539 | release = false; |
1da177e4 LT |
540 | } |
541 | } | |
bec251bc | 542 | spin_unlock(&dev->tx_global_lock); |
1da177e4 | 543 | |
f12bf6f3 | 544 | if (release) |
d62607c3 | 545 | netdev_put(dev, &dev->watchdog_dev_tracker); |
1da177e4 LT |
546 | } |
547 | ||
1da177e4 LT |
548 | void __netdev_watchdog_up(struct net_device *dev) |
549 | { | |
d314774c | 550 | if (dev->netdev_ops->ndo_tx_timeout) { |
1da177e4 LT |
551 | if (dev->watchdog_timeo <= 0) |
552 | dev->watchdog_timeo = 5*HZ; | |
60468d5b VP |
553 | if (!mod_timer(&dev->watchdog_timer, |
554 | round_jiffies(jiffies + dev->watchdog_timeo))) | |
d62607c3 JK |
555 | netdev_hold(dev, &dev->watchdog_dev_tracker, |
556 | GFP_ATOMIC); | |
1da177e4 LT |
557 | } |
558 | } | |
1a3db27a | 559 | EXPORT_SYMBOL_GPL(__netdev_watchdog_up); |
1da177e4 LT |
560 | |
561 | static void dev_watchdog_up(struct net_device *dev) | |
562 | { | |
1da177e4 | 563 | __netdev_watchdog_up(dev); |
1da177e4 LT |
564 | } |
565 | ||
566 | static void dev_watchdog_down(struct net_device *dev) | |
567 | { | |
932ff279 | 568 | netif_tx_lock_bh(dev); |
1da177e4 | 569 | if (del_timer(&dev->watchdog_timer)) |
d62607c3 | 570 | netdev_put(dev, &dev->watchdog_dev_tracker); |
932ff279 | 571 | netif_tx_unlock_bh(dev); |
1da177e4 LT |
572 | } |
573 | ||
bea3348e SH |
574 | /** |
575 | * netif_carrier_on - set carrier | |
576 | * @dev: network device | |
577 | * | |
989723b0 | 578 | * Device has detected acquisition of carrier. |
bea3348e | 579 | */ |
0a242efc DV |
580 | void netif_carrier_on(struct net_device *dev) |
581 | { | |
bfaae0f0 | 582 | if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
b4730016 DM |
583 | if (dev->reg_state == NETREG_UNINITIALIZED) |
584 | return; | |
b2d3bcfa | 585 | atomic_inc(&dev->carrier_up_count); |
0a242efc | 586 | linkwatch_fire_event(dev); |
bfaae0f0 JG |
587 | if (netif_running(dev)) |
588 | __netdev_watchdog_up(dev); | |
589 | } | |
0a242efc | 590 | } |
62e3ba1b | 591 | EXPORT_SYMBOL(netif_carrier_on); |
0a242efc | 592 | |
bea3348e SH |
593 | /** |
594 | * netif_carrier_off - clear carrier | |
595 | * @dev: network device | |
596 | * | |
597 | * Device has detected loss of carrier. | |
598 | */ | |
0a242efc DV |
599 | void netif_carrier_off(struct net_device *dev) |
600 | { | |
b4730016 DM |
601 | if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
602 | if (dev->reg_state == NETREG_UNINITIALIZED) | |
603 | return; | |
b2d3bcfa | 604 | atomic_inc(&dev->carrier_down_count); |
0a242efc | 605 | linkwatch_fire_event(dev); |
b4730016 | 606 | } |
0a242efc | 607 | } |
62e3ba1b | 608 | EXPORT_SYMBOL(netif_carrier_off); |
0a242efc | 609 | |
490dceca JK |
610 | /** |
611 | * netif_carrier_event - report carrier state event | |
612 | * @dev: network device | |
613 | * | |
614 | * Device has detected a carrier event but the carrier state wasn't changed. | |
615 | * Use in drivers when querying carrier state asynchronously, to avoid missing | |
616 | * events (link flaps) if link recovers before it's queried. | |
617 | */ | |
618 | void netif_carrier_event(struct net_device *dev) | |
619 | { | |
620 | if (dev->reg_state == NETREG_UNINITIALIZED) | |
621 | return; | |
622 | atomic_inc(&dev->carrier_up_count); | |
623 | atomic_inc(&dev->carrier_down_count); | |
624 | linkwatch_fire_event(dev); | |
625 | } | |
626 | EXPORT_SYMBOL_GPL(netif_carrier_event); | |
627 | ||
1da177e4 LT |
628 | /* "NOOP" scheduler: the best scheduler, recommended for all interfaces |
629 | under all circumstances. It is difficult to invent anything faster or | |
630 | cheaper. | |
631 | */ | |
632 | ||
520ac30f ED |
633 | static int noop_enqueue(struct sk_buff *skb, struct Qdisc *qdisc, |
634 | struct sk_buff **to_free) | |
1da177e4 | 635 | { |
520ac30f | 636 | __qdisc_drop(skb, to_free); |
1da177e4 LT |
637 | return NET_XMIT_CN; |
638 | } | |
639 | ||
82d567c2 | 640 | static struct sk_buff *noop_dequeue(struct Qdisc *qdisc) |
1da177e4 LT |
641 | { |
642 | return NULL; | |
643 | } | |
644 | ||
20fea08b | 645 | struct Qdisc_ops noop_qdisc_ops __read_mostly = { |
1da177e4 LT |
646 | .id = "noop", |
647 | .priv_size = 0, | |
648 | .enqueue = noop_enqueue, | |
649 | .dequeue = noop_dequeue, | |
99c0db26 | 650 | .peek = noop_dequeue, |
1da177e4 LT |
651 | .owner = THIS_MODULE, |
652 | }; | |
653 | ||
7698b4fc | 654 | static struct netdev_queue noop_netdev_queue = { |
3b40bf4e | 655 | RCU_POINTER_INITIALIZER(qdisc, &noop_qdisc), |
d636fc5d | 656 | RCU_POINTER_INITIALIZER(qdisc_sleeping, &noop_qdisc), |
7698b4fc DM |
657 | }; |
658 | ||
1da177e4 LT |
659 | struct Qdisc noop_qdisc = { |
660 | .enqueue = noop_enqueue, | |
661 | .dequeue = noop_dequeue, | |
662 | .flags = TCQ_F_BUILTIN, | |
10297b99 | 663 | .ops = &noop_qdisc_ops, |
83874000 | 664 | .q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock), |
7698b4fc | 665 | .dev_queue = &noop_netdev_queue, |
7b5edbc4 | 666 | .busylock = __SPIN_LOCK_UNLOCKED(noop_qdisc.busylock), |
f98ebd47 ED |
667 | .gso_skb = { |
668 | .next = (struct sk_buff *)&noop_qdisc.gso_skb, | |
669 | .prev = (struct sk_buff *)&noop_qdisc.gso_skb, | |
670 | .qlen = 0, | |
671 | .lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.gso_skb.lock), | |
672 | }, | |
673 | .skb_bad_txq = { | |
674 | .next = (struct sk_buff *)&noop_qdisc.skb_bad_txq, | |
675 | .prev = (struct sk_buff *)&noop_qdisc.skb_bad_txq, | |
676 | .qlen = 0, | |
677 | .lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.skb_bad_txq.lock), | |
678 | }, | |
1da177e4 | 679 | }; |
62e3ba1b | 680 | EXPORT_SYMBOL(noop_qdisc); |
1da177e4 | 681 | |
e63d7dfd AA |
682 | static int noqueue_init(struct Qdisc *qdisc, struct nlattr *opt, |
683 | struct netlink_ext_ack *extack) | |
d66d6c31 PS |
684 | { |
685 | /* register_qdisc() assigns a default of noop_enqueue if unset, | |
686 | * but __dev_queue_xmit() treats noqueue only as such | |
687 | * if this is NULL - so clear it here. */ | |
688 | qdisc->enqueue = NULL; | |
689 | return 0; | |
690 | } | |
691 | ||
692 | struct Qdisc_ops noqueue_qdisc_ops __read_mostly = { | |
1da177e4 LT |
693 | .id = "noqueue", |
694 | .priv_size = 0, | |
d66d6c31 | 695 | .init = noqueue_init, |
1da177e4 LT |
696 | .enqueue = noop_enqueue, |
697 | .dequeue = noop_dequeue, | |
99c0db26 | 698 | .peek = noop_dequeue, |
1da177e4 LT |
699 | .owner = THIS_MODULE, |
700 | }; | |
701 | ||
5579ee46 ED |
702 | const u8 sch_default_prio2band[TC_PRIO_MAX + 1] = { |
703 | 1, 2, 2, 2, 1, 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1 | |
cc7ec456 | 704 | }; |
5579ee46 | 705 | EXPORT_SYMBOL(sch_default_prio2band); |
d3678b46 DM |
706 | |
707 | /* 3-band FIFO queue: old style, but should be a bit faster than | |
708 | generic prio+fifo combination. | |
709 | */ | |
710 | ||
711 | #define PFIFO_FAST_BANDS 3 | |
712 | ||
fd3ae5e8 KK |
713 | /* |
714 | * Private data for a pfifo_fast scheduler containing: | |
c5ad119f | 715 | * - rings for priority bands |
fd3ae5e8 KK |
716 | */ |
717 | struct pfifo_fast_priv { | |
c5ad119f | 718 | struct skb_array q[PFIFO_FAST_BANDS]; |
fd3ae5e8 KK |
719 | }; |
720 | ||
c5ad119f JF |
721 | static inline struct skb_array *band2list(struct pfifo_fast_priv *priv, |
722 | int band) | |
d3678b46 | 723 | { |
c5ad119f | 724 | return &priv->q[band]; |
d3678b46 DM |
725 | } |
726 | ||
520ac30f ED |
727 | static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc, |
728 | struct sk_buff **to_free) | |
321090e7 | 729 | { |
5579ee46 | 730 | int band = sch_default_prio2band[skb->priority & TC_PRIO_MAX]; |
c5ad119f JF |
731 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
732 | struct skb_array *q = band2list(priv, band); | |
cce6294c | 733 | unsigned int pkt_len = qdisc_pkt_len(skb); |
c5ad119f | 734 | int err; |
821d24ae | 735 | |
c5ad119f JF |
736 | err = skb_array_produce(q, skb); |
737 | ||
092e22e5 DC |
738 | if (unlikely(err)) { |
739 | if (qdisc_is_percpu_stats(qdisc)) | |
740 | return qdisc_drop_cpu(skb, qdisc, to_free); | |
741 | else | |
742 | return qdisc_drop(skb, qdisc, to_free); | |
743 | } | |
c5ad119f | 744 | |
8a53e616 | 745 | qdisc_update_stats_at_enqueue(qdisc, pkt_len); |
c5ad119f | 746 | return NET_XMIT_SUCCESS; |
1da177e4 LT |
747 | } |
748 | ||
cc7ec456 | 749 | static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc) |
1da177e4 | 750 | { |
fd3ae5e8 | 751 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
c5ad119f | 752 | struct sk_buff *skb = NULL; |
a90c57f2 | 753 | bool need_retry = true; |
c5ad119f | 754 | int band; |
ec323368 | 755 | |
a90c57f2 | 756 | retry: |
c5ad119f JF |
757 | for (band = 0; band < PFIFO_FAST_BANDS && !skb; band++) { |
758 | struct skb_array *q = band2list(priv, band); | |
fd3ae5e8 | 759 | |
c5ad119f JF |
760 | if (__skb_array_empty(q)) |
761 | continue; | |
fd3ae5e8 | 762 | |
021a17ed | 763 | skb = __skb_array_consume(q); |
c5ad119f JF |
764 | } |
765 | if (likely(skb)) { | |
8a53e616 | 766 | qdisc_update_stats_at_dequeue(qdisc, skb); |
a90c57f2 | 767 | } else if (need_retry && |
c4fef01b | 768 | READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY) { |
a90c57f2 YL |
769 | /* Delay clearing the STATE_MISSED here to reduce |
770 | * the overhead of the second spin_trylock() in | |
771 | * qdisc_run_begin() and __netif_schedule() calling | |
772 | * in qdisc_run_end(). | |
773 | */ | |
774 | clear_bit(__QDISC_STATE_MISSED, &qdisc->state); | |
c4fef01b | 775 | clear_bit(__QDISC_STATE_DRAINING, &qdisc->state); |
a90c57f2 YL |
776 | |
777 | /* Make sure dequeuing happens after clearing | |
778 | * STATE_MISSED. | |
779 | */ | |
780 | smp_mb__after_atomic(); | |
781 | ||
782 | need_retry = false; | |
783 | ||
784 | goto retry; | |
d3678b46 | 785 | } |
f87a9c3d | 786 | |
c5ad119f | 787 | return skb; |
1da177e4 LT |
788 | } |
789 | ||
cc7ec456 | 790 | static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc) |
99c0db26 | 791 | { |
fd3ae5e8 | 792 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
c5ad119f JF |
793 | struct sk_buff *skb = NULL; |
794 | int band; | |
fd3ae5e8 | 795 | |
c5ad119f JF |
796 | for (band = 0; band < PFIFO_FAST_BANDS && !skb; band++) { |
797 | struct skb_array *q = band2list(priv, band); | |
99c0db26 | 798 | |
c5ad119f | 799 | skb = __skb_array_peek(q); |
99c0db26 JP |
800 | } |
801 | ||
c5ad119f | 802 | return skb; |
99c0db26 JP |
803 | } |
804 | ||
cc7ec456 | 805 | static void pfifo_fast_reset(struct Qdisc *qdisc) |
1da177e4 | 806 | { |
c5ad119f | 807 | int i, band; |
fd3ae5e8 | 808 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
d3678b46 | 809 | |
c5ad119f JF |
810 | for (band = 0; band < PFIFO_FAST_BANDS; band++) { |
811 | struct skb_array *q = band2list(priv, band); | |
812 | struct sk_buff *skb; | |
d3678b46 | 813 | |
1df94c3c CW |
814 | /* NULL ring is possible if destroy path is due to a failed |
815 | * skb_array_init() in pfifo_fast_init() case. | |
816 | */ | |
817 | if (!q->ring.queue) | |
818 | continue; | |
819 | ||
021a17ed | 820 | while ((skb = __skb_array_consume(q)) != NULL) |
c5ad119f JF |
821 | kfree_skb(skb); |
822 | } | |
823 | ||
04d37cf4 DC |
824 | if (qdisc_is_percpu_stats(qdisc)) { |
825 | for_each_possible_cpu(i) { | |
826 | struct gnet_stats_queue *q; | |
c5ad119f | 827 | |
04d37cf4 DC |
828 | q = per_cpu_ptr(qdisc->cpu_qstats, i); |
829 | q->backlog = 0; | |
830 | q->qlen = 0; | |
831 | } | |
c5ad119f | 832 | } |
1da177e4 LT |
833 | } |
834 | ||
d3678b46 DM |
835 | static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) |
836 | { | |
837 | struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; | |
838 | ||
5579ee46 | 839 | memcpy(&opt.priomap, sch_default_prio2band, TC_PRIO_MAX + 1); |
1b34ec43 DM |
840 | if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
841 | goto nla_put_failure; | |
d3678b46 DM |
842 | return skb->len; |
843 | ||
844 | nla_put_failure: | |
845 | return -1; | |
846 | } | |
847 | ||
e63d7dfd AA |
848 | static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt, |
849 | struct netlink_ext_ack *extack) | |
d3678b46 | 850 | { |
c5ad119f | 851 | unsigned int qlen = qdisc_dev(qdisc)->tx_queue_len; |
fd3ae5e8 | 852 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
c5ad119f JF |
853 | int prio; |
854 | ||
855 | /* guard against zero length rings */ | |
856 | if (!qlen) | |
857 | return -EINVAL; | |
d3678b46 | 858 | |
c5ad119f JF |
859 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) { |
860 | struct skb_array *q = band2list(priv, prio); | |
861 | int err; | |
862 | ||
863 | err = skb_array_init(q, qlen, GFP_KERNEL); | |
864 | if (err) | |
865 | return -ENOMEM; | |
866 | } | |
d3678b46 | 867 | |
23624935 ED |
868 | /* Can by-pass the queue discipline */ |
869 | qdisc->flags |= TCQ_F_CAN_BYPASS; | |
d3678b46 DM |
870 | return 0; |
871 | } | |
872 | ||
c5ad119f JF |
873 | static void pfifo_fast_destroy(struct Qdisc *sch) |
874 | { | |
875 | struct pfifo_fast_priv *priv = qdisc_priv(sch); | |
876 | int prio; | |
877 | ||
878 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) { | |
879 | struct skb_array *q = band2list(priv, prio); | |
880 | ||
881 | /* NULL ring is possible if destroy path is due to a failed | |
882 | * skb_array_init() in pfifo_fast_init() case. | |
883 | */ | |
1df94c3c | 884 | if (!q->ring.queue) |
c5ad119f JF |
885 | continue; |
886 | /* Destroy ring but no need to kfree_skb because a call to | |
887 | * pfifo_fast_reset() has already done that work. | |
888 | */ | |
889 | ptr_ring_cleanup(&q->ring, NULL); | |
890 | } | |
891 | } | |
892 | ||
7007ba63 CW |
893 | static int pfifo_fast_change_tx_queue_len(struct Qdisc *sch, |
894 | unsigned int new_len) | |
895 | { | |
896 | struct pfifo_fast_priv *priv = qdisc_priv(sch); | |
897 | struct skb_array *bands[PFIFO_FAST_BANDS]; | |
898 | int prio; | |
899 | ||
900 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) { | |
901 | struct skb_array *q = band2list(priv, prio); | |
902 | ||
903 | bands[prio] = q; | |
904 | } | |
905 | ||
906 | return skb_array_resize_multiple(bands, PFIFO_FAST_BANDS, new_len, | |
907 | GFP_KERNEL); | |
908 | } | |
909 | ||
6ec1c69a | 910 | struct Qdisc_ops pfifo_fast_ops __read_mostly = { |
d3678b46 | 911 | .id = "pfifo_fast", |
fd3ae5e8 | 912 | .priv_size = sizeof(struct pfifo_fast_priv), |
d3678b46 DM |
913 | .enqueue = pfifo_fast_enqueue, |
914 | .dequeue = pfifo_fast_dequeue, | |
99c0db26 | 915 | .peek = pfifo_fast_peek, |
d3678b46 | 916 | .init = pfifo_fast_init, |
c5ad119f | 917 | .destroy = pfifo_fast_destroy, |
d3678b46 DM |
918 | .reset = pfifo_fast_reset, |
919 | .dump = pfifo_fast_dump, | |
7007ba63 | 920 | .change_tx_queue_len = pfifo_fast_change_tx_queue_len, |
1da177e4 | 921 | .owner = THIS_MODULE, |
c5ad119f | 922 | .static_flags = TCQ_F_NOLOCK | TCQ_F_CPUSTATS, |
1da177e4 | 923 | }; |
1f27cde3 | 924 | EXPORT_SYMBOL(pfifo_fast_ops); |
1da177e4 | 925 | |
1a33e10e | 926 | static struct lock_class_key qdisc_tx_busylock; |
1a33e10e | 927 | |
5ce2d488 | 928 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d0bd684d AA |
929 | const struct Qdisc_ops *ops, |
930 | struct netlink_ext_ack *extack) | |
1da177e4 | 931 | { |
1da177e4 | 932 | struct Qdisc *sch; |
846e463a | 933 | unsigned int size = sizeof(*sch) + ops->priv_size; |
3d54b82f | 934 | int err = -ENOBUFS; |
26aa0459 JSP |
935 | struct net_device *dev; |
936 | ||
937 | if (!dev_queue) { | |
d0bd684d | 938 | NL_SET_ERR_MSG(extack, "No device queue given"); |
26aa0459 JSP |
939 | err = -EINVAL; |
940 | goto errout; | |
941 | } | |
1da177e4 | 942 | |
26aa0459 | 943 | dev = dev_queue->dev; |
846e463a | 944 | sch = kzalloc_node(size, GFP_KERNEL, netdev_queue_numa_node_read(dev_queue)); |
f2cd2d3e | 945 | |
846e463a | 946 | if (!sch) |
3d54b82f | 947 | goto errout; |
a53851e2 | 948 | __skb_queue_head_init(&sch->gso_skb); |
70e57d5e | 949 | __skb_queue_head_init(&sch->skb_bad_txq); |
50dc9a85 | 950 | gnet_stats_basic_sync_init(&sch->bstats); |
af0cb3fa | 951 | lockdep_register_key(&sch->root_lock_key); |
48da34b7 | 952 | spin_lock_init(&sch->q.lock); |
af0cb3fa | 953 | lockdep_set_class(&sch->q.lock, &sch->root_lock_key); |
23d3b8bf | 954 | |
d59f5ffa JF |
955 | if (ops->static_flags & TCQ_F_CPUSTATS) { |
956 | sch->cpu_bstats = | |
50dc9a85 | 957 | netdev_alloc_pcpu_stats(struct gnet_stats_basic_sync); |
d59f5ffa JF |
958 | if (!sch->cpu_bstats) |
959 | goto errout1; | |
960 | ||
961 | sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); | |
962 | if (!sch->cpu_qstats) { | |
963 | free_percpu(sch->cpu_bstats); | |
964 | goto errout1; | |
965 | } | |
966 | } | |
967 | ||
79640a4c | 968 | spin_lock_init(&sch->busylock); |
1a33e10e CW |
969 | lockdep_set_class(&sch->busylock, |
970 | dev->qdisc_tx_busylock ?: &qdisc_tx_busylock); | |
971 | ||
96009c7d PA |
972 | /* seqlock has the same scope of busylock, for NOLOCK qdisc */ |
973 | spin_lock_init(&sch->seqlock); | |
06f5553e | 974 | lockdep_set_class(&sch->seqlock, |
1a33e10e | 975 | dev->qdisc_tx_busylock ?: &qdisc_tx_busylock); |
f9eb8aea | 976 | |
1da177e4 | 977 | sch->ops = ops; |
d59f5ffa | 978 | sch->flags = ops->static_flags; |
1da177e4 LT |
979 | sch->enqueue = ops->enqueue; |
980 | sch->dequeue = ops->dequeue; | |
bb949fbd | 981 | sch->dev_queue = dev_queue; |
0f022d32 | 982 | sch->owner = -1; |
d62607c3 | 983 | netdev_hold(dev, &sch->dev_tracker, GFP_KERNEL); |
7b936405 | 984 | refcount_set(&sch->refcnt, 1); |
3d54b82f TG |
985 | |
986 | return sch; | |
d59f5ffa | 987 | errout1: |
86735b57 | 988 | lockdep_unregister_key(&sch->root_lock_key); |
846e463a | 989 | kfree(sch); |
3d54b82f | 990 | errout: |
01e123d7 | 991 | return ERR_PTR(err); |
3d54b82f TG |
992 | } |
993 | ||
3511c913 | 994 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 995 | const struct Qdisc_ops *ops, |
a38a9882 AA |
996 | unsigned int parentid, |
997 | struct netlink_ext_ack *extack) | |
3d54b82f TG |
998 | { |
999 | struct Qdisc *sch; | |
10297b99 | 1000 | |
a38a9882 AA |
1001 | if (!try_module_get(ops->owner)) { |
1002 | NL_SET_ERR_MSG(extack, "Failed to increase module reference counter"); | |
166ee5b8 | 1003 | return NULL; |
a38a9882 | 1004 | } |
6da7c8fc | 1005 | |
a38a9882 | 1006 | sch = qdisc_alloc(dev_queue, ops, extack); |
166ee5b8 ED |
1007 | if (IS_ERR(sch)) { |
1008 | module_put(ops->owner); | |
1009 | return NULL; | |
1010 | } | |
9f9afec4 | 1011 | sch->parent = parentid; |
3d54b82f | 1012 | |
f5a7833e CW |
1013 | if (!ops->init || ops->init(sch, NULL, extack) == 0) { |
1014 | trace_qdisc_create(ops, dev_queue->dev, parentid); | |
1da177e4 | 1015 | return sch; |
f5a7833e | 1016 | } |
1da177e4 | 1017 | |
86bd446b | 1018 | qdisc_put(sch); |
1da177e4 LT |
1019 | return NULL; |
1020 | } | |
62e3ba1b | 1021 | EXPORT_SYMBOL(qdisc_create_dflt); |
1da177e4 | 1022 | |
5fb66229 | 1023 | /* Under qdisc_lock(qdisc) and BH! */ |
1da177e4 LT |
1024 | |
1025 | void qdisc_reset(struct Qdisc *qdisc) | |
1026 | { | |
20fea08b | 1027 | const struct Qdisc_ops *ops = qdisc->ops; |
1da177e4 | 1028 | |
a34dac0b CW |
1029 | trace_qdisc_reset(qdisc); |
1030 | ||
1da177e4 LT |
1031 | if (ops->reset) |
1032 | ops->reset(qdisc); | |
67305ebc | 1033 | |
c9a40d1c ED |
1034 | __skb_queue_purge(&qdisc->gso_skb); |
1035 | __skb_queue_purge(&qdisc->skb_bad_txq); | |
70e57d5e | 1036 | |
4d202a0d | 1037 | qdisc->q.qlen = 0; |
c8e18129 | 1038 | qdisc->qstats.backlog = 0; |
1da177e4 | 1039 | } |
62e3ba1b | 1040 | EXPORT_SYMBOL(qdisc_reset); |
1da177e4 | 1041 | |
81d947e2 | 1042 | void qdisc_free(struct Qdisc *qdisc) |
5d944c64 | 1043 | { |
73c20a8b | 1044 | if (qdisc_is_percpu_stats(qdisc)) { |
22e0f8b9 | 1045 | free_percpu(qdisc->cpu_bstats); |
73c20a8b JF |
1046 | free_percpu(qdisc->cpu_qstats); |
1047 | } | |
22e0f8b9 | 1048 | |
846e463a | 1049 | kfree(qdisc); |
5d944c64 ED |
1050 | } |
1051 | ||
5362700c | 1052 | static void qdisc_free_cb(struct rcu_head *head) |
3a7d0d07 VB |
1053 | { |
1054 | struct Qdisc *q = container_of(head, struct Qdisc, rcu); | |
1055 | ||
1056 | qdisc_free(q); | |
1057 | } | |
1058 | ||
84ad0af0 | 1059 | static void __qdisc_destroy(struct Qdisc *qdisc) |
1da177e4 | 1060 | { |
8a34c5dc | 1061 | const struct Qdisc_ops *ops = qdisc->ops; |
913b47d3 | 1062 | struct net_device *dev = qdisc_dev(qdisc); |
8a34c5dc | 1063 | |
3a682fbd | 1064 | #ifdef CONFIG_NET_SCHED |
59cc1f61 | 1065 | qdisc_hash_del(qdisc); |
f6e0b239 | 1066 | |
a2da570d | 1067 | qdisc_put_stab(rtnl_dereference(qdisc->stab)); |
3a682fbd | 1068 | #endif |
1c0d32fd | 1069 | gen_kill_estimator(&qdisc->rate_est); |
4909daba CW |
1070 | |
1071 | qdisc_reset(qdisc); | |
1072 | ||
913b47d3 | 1073 | |
8a34c5dc DM |
1074 | if (ops->destroy) |
1075 | ops->destroy(qdisc); | |
1076 | ||
af0cb3fa | 1077 | lockdep_unregister_key(&qdisc->root_lock_key); |
8a34c5dc | 1078 | module_put(ops->owner); |
913b47d3 | 1079 | netdev_put(dev, &qdisc->dev_tracker); |
8a34c5dc | 1080 | |
a34dac0b CW |
1081 | trace_qdisc_destroy(qdisc); |
1082 | ||
3a7d0d07 | 1083 | call_rcu(&qdisc->rcu, qdisc_free_cb); |
1da177e4 | 1084 | } |
86bd446b | 1085 | |
84ad0af0 PY |
1086 | void qdisc_destroy(struct Qdisc *qdisc) |
1087 | { | |
1088 | if (qdisc->flags & TCQ_F_BUILTIN) | |
1089 | return; | |
1090 | ||
1091 | __qdisc_destroy(qdisc); | |
1092 | } | |
1093 | ||
86bd446b VB |
1094 | void qdisc_put(struct Qdisc *qdisc) |
1095 | { | |
6efb971b CW |
1096 | if (!qdisc) |
1097 | return; | |
1098 | ||
86bd446b VB |
1099 | if (qdisc->flags & TCQ_F_BUILTIN || |
1100 | !refcount_dec_and_test(&qdisc->refcnt)) | |
1101 | return; | |
1102 | ||
84ad0af0 | 1103 | __qdisc_destroy(qdisc); |
86bd446b VB |
1104 | } |
1105 | EXPORT_SYMBOL(qdisc_put); | |
1da177e4 | 1106 | |
3a7d0d07 VB |
1107 | /* Version of qdisc_put() that is called with rtnl mutex unlocked. |
1108 | * Intended to be used as optimization, this function only takes rtnl lock if | |
1109 | * qdisc reference counter reached zero. | |
1110 | */ | |
1111 | ||
1112 | void qdisc_put_unlocked(struct Qdisc *qdisc) | |
1113 | { | |
1114 | if (qdisc->flags & TCQ_F_BUILTIN || | |
1115 | !refcount_dec_and_rtnl_lock(&qdisc->refcnt)) | |
1116 | return; | |
1117 | ||
84ad0af0 | 1118 | __qdisc_destroy(qdisc); |
3a7d0d07 VB |
1119 | rtnl_unlock(); |
1120 | } | |
1121 | EXPORT_SYMBOL(qdisc_put_unlocked); | |
1122 | ||
589983cd PM |
1123 | /* Attach toplevel qdisc to device queue. */ |
1124 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
1125 | struct Qdisc *qdisc) | |
1126 | { | |
d636fc5d | 1127 | struct Qdisc *oqdisc = rtnl_dereference(dev_queue->qdisc_sleeping); |
589983cd PM |
1128 | spinlock_t *root_lock; |
1129 | ||
1130 | root_lock = qdisc_lock(oqdisc); | |
1131 | spin_lock_bh(root_lock); | |
1132 | ||
589983cd PM |
1133 | /* ... and graft new one */ |
1134 | if (qdisc == NULL) | |
1135 | qdisc = &noop_qdisc; | |
d636fc5d | 1136 | rcu_assign_pointer(dev_queue->qdisc_sleeping, qdisc); |
589983cd PM |
1137 | rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc); |
1138 | ||
1139 | spin_unlock_bh(root_lock); | |
1140 | ||
1141 | return oqdisc; | |
1142 | } | |
b8970f0b | 1143 | EXPORT_SYMBOL(dev_graft_qdisc); |
589983cd | 1144 | |
f612466e WH |
1145 | static void shutdown_scheduler_queue(struct net_device *dev, |
1146 | struct netdev_queue *dev_queue, | |
1147 | void *_qdisc_default) | |
1148 | { | |
d636fc5d | 1149 | struct Qdisc *qdisc = rtnl_dereference(dev_queue->qdisc_sleeping); |
f612466e WH |
1150 | struct Qdisc *qdisc_default = _qdisc_default; |
1151 | ||
1152 | if (qdisc) { | |
1153 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); | |
d636fc5d | 1154 | rcu_assign_pointer(dev_queue->qdisc_sleeping, qdisc_default); |
f612466e WH |
1155 | |
1156 | qdisc_put(qdisc); | |
1157 | } | |
1158 | } | |
1159 | ||
e8a0464c DM |
1160 | static void attach_one_default_qdisc(struct net_device *dev, |
1161 | struct netdev_queue *dev_queue, | |
1162 | void *_unused) | |
1163 | { | |
3e692f21 PS |
1164 | struct Qdisc *qdisc; |
1165 | const struct Qdisc_ops *ops = default_qdisc_ops; | |
e8a0464c | 1166 | |
3e692f21 PS |
1167 | if (dev->priv_flags & IFF_NO_QUEUE) |
1168 | ops = &noqueue_qdisc_ops; | |
546b85bb VP |
1169 | else if(dev->type == ARPHRD_CAN) |
1170 | ops = &pfifo_fast_ops; | |
3e692f21 | 1171 | |
a38a9882 | 1172 | qdisc = qdisc_create_dflt(dev_queue, ops, TC_H_ROOT, NULL); |
bf6dba76 | 1173 | if (!qdisc) |
3e692f21 | 1174 | return; |
bf6dba76 | 1175 | |
3e692f21 | 1176 | if (!netif_is_multiqueue(dev)) |
4eaf3b84 | 1177 | qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; |
d636fc5d | 1178 | rcu_assign_pointer(dev_queue->qdisc_sleeping, qdisc); |
e8a0464c DM |
1179 | } |
1180 | ||
6ec1c69a DM |
1181 | static void attach_default_qdiscs(struct net_device *dev) |
1182 | { | |
1183 | struct netdev_queue *txq; | |
1184 | struct Qdisc *qdisc; | |
1185 | ||
1186 | txq = netdev_get_tx_queue(dev, 0); | |
1187 | ||
4b469955 | 1188 | if (!netif_is_multiqueue(dev) || |
4b469955 | 1189 | dev->priv_flags & IFF_NO_QUEUE) { |
6ec1c69a | 1190 | netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL); |
d636fc5d | 1191 | qdisc = rtnl_dereference(txq->qdisc_sleeping); |
5891cd5e ED |
1192 | rcu_assign_pointer(dev->qdisc, qdisc); |
1193 | qdisc_refcount_inc(qdisc); | |
6ec1c69a | 1194 | } else { |
a38a9882 | 1195 | qdisc = qdisc_create_dflt(txq, &mq_qdisc_ops, TC_H_ROOT, NULL); |
6ec1c69a | 1196 | if (qdisc) { |
5891cd5e | 1197 | rcu_assign_pointer(dev->qdisc, qdisc); |
e57a784d | 1198 | qdisc->ops->attach(qdisc); |
6ec1c69a DM |
1199 | } |
1200 | } | |
5891cd5e | 1201 | qdisc = rtnl_dereference(dev->qdisc); |
bf6dba76 JDB |
1202 | |
1203 | /* Detect default qdisc setup/init failed and fallback to "noqueue" */ | |
5891cd5e | 1204 | if (qdisc == &noop_qdisc) { |
bf6dba76 JDB |
1205 | netdev_warn(dev, "default qdisc (%s) fail, fallback to %s\n", |
1206 | default_qdisc_ops->id, noqueue_qdisc_ops.id); | |
f612466e | 1207 | netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc); |
bf6dba76 JDB |
1208 | dev->priv_flags |= IFF_NO_QUEUE; |
1209 | netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL); | |
d636fc5d | 1210 | qdisc = rtnl_dereference(txq->qdisc_sleeping); |
5891cd5e ED |
1211 | rcu_assign_pointer(dev->qdisc, qdisc); |
1212 | qdisc_refcount_inc(qdisc); | |
bf6dba76 JDB |
1213 | dev->priv_flags ^= IFF_NO_QUEUE; |
1214 | } | |
1215 | ||
59cc1f61 | 1216 | #ifdef CONFIG_NET_SCHED |
5891cd5e ED |
1217 | if (qdisc != &noop_qdisc) |
1218 | qdisc_hash_add(qdisc, false); | |
59cc1f61 | 1219 | #endif |
6ec1c69a DM |
1220 | } |
1221 | ||
e8a0464c DM |
1222 | static void transition_one_qdisc(struct net_device *dev, |
1223 | struct netdev_queue *dev_queue, | |
1224 | void *_need_watchdog) | |
1225 | { | |
d636fc5d | 1226 | struct Qdisc *new_qdisc = rtnl_dereference(dev_queue->qdisc_sleeping); |
e8a0464c DM |
1227 | int *need_watchdog_p = _need_watchdog; |
1228 | ||
a9312ae8 DM |
1229 | if (!(new_qdisc->flags & TCQ_F_BUILTIN)) |
1230 | clear_bit(__QDISC_STATE_DEACTIVATED, &new_qdisc->state); | |
1231 | ||
83874000 | 1232 | rcu_assign_pointer(dev_queue->qdisc, new_qdisc); |
3e692f21 | 1233 | if (need_watchdog_p) { |
5337824f | 1234 | WRITE_ONCE(dev_queue->trans_start, 0); |
e8a0464c | 1235 | *need_watchdog_p = 1; |
9d21493b | 1236 | } |
e8a0464c DM |
1237 | } |
1238 | ||
1da177e4 LT |
1239 | void dev_activate(struct net_device *dev) |
1240 | { | |
e8a0464c | 1241 | int need_watchdog; |
b0e1e646 | 1242 | |
1da177e4 | 1243 | /* No queueing discipline is attached to device; |
6da7c8fc | 1244 | * create default one for devices, which need queueing |
1245 | * and noqueue_qdisc for virtual interfaces | |
1da177e4 LT |
1246 | */ |
1247 | ||
5891cd5e | 1248 | if (rtnl_dereference(dev->qdisc) == &noop_qdisc) |
6ec1c69a | 1249 | attach_default_qdiscs(dev); |
af356afa | 1250 | |
cacaddf5 TC |
1251 | if (!netif_carrier_ok(dev)) |
1252 | /* Delay activation until next carrier-on event */ | |
1253 | return; | |
1254 | ||
e8a0464c DM |
1255 | need_watchdog = 0; |
1256 | netdev_for_each_tx_queue(dev, transition_one_qdisc, &need_watchdog); | |
24824a09 ED |
1257 | if (dev_ingress_queue(dev)) |
1258 | transition_one_qdisc(dev, dev_ingress_queue(dev), NULL); | |
e8a0464c DM |
1259 | |
1260 | if (need_watchdog) { | |
860e9538 | 1261 | netif_trans_update(dev); |
1da177e4 LT |
1262 | dev_watchdog_up(dev); |
1263 | } | |
b0e1e646 | 1264 | } |
b8970f0b | 1265 | EXPORT_SYMBOL(dev_activate); |
b0e1e646 | 1266 | |
70f50965 CW |
1267 | static void qdisc_deactivate(struct Qdisc *qdisc) |
1268 | { | |
70f50965 CW |
1269 | if (qdisc->flags & TCQ_F_BUILTIN) |
1270 | return; | |
70f50965 CW |
1271 | |
1272 | set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state); | |
70f50965 CW |
1273 | } |
1274 | ||
e8a0464c DM |
1275 | static void dev_deactivate_queue(struct net_device *dev, |
1276 | struct netdev_queue *dev_queue, | |
1277 | void *_qdisc_default) | |
b0e1e646 | 1278 | { |
e8a0464c | 1279 | struct Qdisc *qdisc_default = _qdisc_default; |
970565bb | 1280 | struct Qdisc *qdisc; |
970565bb | 1281 | |
46e5da40 | 1282 | qdisc = rtnl_dereference(dev_queue->qdisc); |
b0e1e646 | 1283 | if (qdisc) { |
70f50965 | 1284 | qdisc_deactivate(qdisc); |
f7a54c13 | 1285 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
b0e1e646 | 1286 | } |
1da177e4 LT |
1287 | } |
1288 | ||
2fb541c8 YL |
1289 | static void dev_reset_queue(struct net_device *dev, |
1290 | struct netdev_queue *dev_queue, | |
1291 | void *_unused) | |
1292 | { | |
1293 | struct Qdisc *qdisc; | |
1294 | bool nolock; | |
1295 | ||
d636fc5d | 1296 | qdisc = rtnl_dereference(dev_queue->qdisc_sleeping); |
2fb541c8 YL |
1297 | if (!qdisc) |
1298 | return; | |
1299 | ||
1300 | nolock = qdisc->flags & TCQ_F_NOLOCK; | |
1301 | ||
1302 | if (nolock) | |
1303 | spin_lock_bh(&qdisc->seqlock); | |
1304 | spin_lock_bh(qdisc_lock(qdisc)); | |
1305 | ||
1306 | qdisc_reset(qdisc); | |
1307 | ||
1308 | spin_unlock_bh(qdisc_lock(qdisc)); | |
102b55ee YL |
1309 | if (nolock) { |
1310 | clear_bit(__QDISC_STATE_MISSED, &qdisc->state); | |
c4fef01b | 1311 | clear_bit(__QDISC_STATE_DRAINING, &qdisc->state); |
2fb541c8 | 1312 | spin_unlock_bh(&qdisc->seqlock); |
102b55ee | 1313 | } |
2fb541c8 YL |
1314 | } |
1315 | ||
4335cd2d | 1316 | static bool some_qdisc_is_busy(struct net_device *dev) |
e8a0464c DM |
1317 | { |
1318 | unsigned int i; | |
1319 | ||
1320 | for (i = 0; i < dev->num_tx_queues; i++) { | |
1321 | struct netdev_queue *dev_queue; | |
7698b4fc | 1322 | spinlock_t *root_lock; |
e2627c8c | 1323 | struct Qdisc *q; |
e8a0464c DM |
1324 | int val; |
1325 | ||
1326 | dev_queue = netdev_get_tx_queue(dev, i); | |
d636fc5d | 1327 | q = rtnl_dereference(dev_queue->qdisc_sleeping); |
e8a0464c | 1328 | |
32f7b44d PA |
1329 | root_lock = qdisc_lock(q); |
1330 | spin_lock_bh(root_lock); | |
e8a0464c | 1331 | |
32f7b44d PA |
1332 | val = (qdisc_is_running(q) || |
1333 | test_bit(__QDISC_STATE_SCHED, &q->state)); | |
e8a0464c | 1334 | |
32f7b44d | 1335 | spin_unlock_bh(root_lock); |
e8a0464c DM |
1336 | |
1337 | if (val) | |
1338 | return true; | |
1339 | } | |
1340 | return false; | |
1341 | } | |
1342 | ||
3137663d ED |
1343 | /** |
1344 | * dev_deactivate_many - deactivate transmissions on several devices | |
1345 | * @head: list of devices to deactivate | |
1346 | * | |
1347 | * This function returns only when all outstanding transmissions | |
1348 | * have completed, unless all devices are in dismantle phase. | |
1349 | */ | |
44345724 | 1350 | void dev_deactivate_many(struct list_head *head) |
1da177e4 | 1351 | { |
44345724 | 1352 | struct net_device *dev; |
41a23b07 | 1353 | |
5cde2829 | 1354 | list_for_each_entry(dev, head, close_list) { |
44345724 OP |
1355 | netdev_for_each_tx_queue(dev, dev_deactivate_queue, |
1356 | &noop_qdisc); | |
1357 | if (dev_ingress_queue(dev)) | |
1358 | dev_deactivate_queue(dev, dev_ingress_queue(dev), | |
1359 | &noop_qdisc); | |
1360 | ||
1361 | dev_watchdog_down(dev); | |
1362 | } | |
1da177e4 | 1363 | |
2fb541c8 YL |
1364 | /* Wait for outstanding qdisc-less dev_queue_xmit calls or |
1365 | * outstanding qdisc enqueuing calls. | |
3137663d ED |
1366 | * This is avoided if all devices are in dismantle phase : |
1367 | * Caller will call synchronize_net() for us | |
1368 | */ | |
7bbde83b | 1369 | synchronize_net(); |
1da177e4 | 1370 | |
2fb541c8 YL |
1371 | list_for_each_entry(dev, head, close_list) { |
1372 | netdev_for_each_tx_queue(dev, dev_reset_queue, NULL); | |
1373 | ||
1374 | if (dev_ingress_queue(dev)) | |
1375 | dev_reset_queue(dev, dev_ingress_queue(dev), NULL); | |
1376 | } | |
1377 | ||
d4828d85 | 1378 | /* Wait for outstanding qdisc_run calls. */ |
7bbde83b | 1379 | list_for_each_entry(dev, head, close_list) { |
4eab421b MKB |
1380 | while (some_qdisc_is_busy(dev)) { |
1381 | /* wait_event() would avoid this sleep-loop but would | |
1382 | * require expensive checks in the fast paths of packet | |
1383 | * processing which isn't worth it. | |
1384 | */ | |
1385 | schedule_timeout_uninterruptible(1); | |
1386 | } | |
7bbde83b | 1387 | } |
44345724 OP |
1388 | } |
1389 | ||
1390 | void dev_deactivate(struct net_device *dev) | |
1391 | { | |
1392 | LIST_HEAD(single); | |
1393 | ||
5cde2829 | 1394 | list_add(&dev->close_list, &single); |
44345724 | 1395 | dev_deactivate_many(&single); |
5f04d506 | 1396 | list_del(&single); |
1da177e4 | 1397 | } |
b8970f0b | 1398 | EXPORT_SYMBOL(dev_deactivate); |
1da177e4 | 1399 | |
48bfd55e CW |
1400 | static int qdisc_change_tx_queue_len(struct net_device *dev, |
1401 | struct netdev_queue *dev_queue) | |
1402 | { | |
d636fc5d | 1403 | struct Qdisc *qdisc = rtnl_dereference(dev_queue->qdisc_sleeping); |
48bfd55e CW |
1404 | const struct Qdisc_ops *ops = qdisc->ops; |
1405 | ||
1406 | if (ops->change_tx_queue_len) | |
1407 | return ops->change_tx_queue_len(qdisc, dev->tx_queue_len); | |
1408 | return 0; | |
1409 | } | |
1410 | ||
1e080f17 JK |
1411 | void dev_qdisc_change_real_num_tx(struct net_device *dev, |
1412 | unsigned int new_real_tx) | |
1413 | { | |
5891cd5e | 1414 | struct Qdisc *qdisc = rtnl_dereference(dev->qdisc); |
1e080f17 JK |
1415 | |
1416 | if (qdisc->ops->change_real_num_tx) | |
1417 | qdisc->ops->change_real_num_tx(qdisc, new_real_tx); | |
1418 | } | |
1419 | ||
f7116fb4 JK |
1420 | void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx) |
1421 | { | |
1422 | #ifdef CONFIG_NET_SCHED | |
1423 | struct net_device *dev = qdisc_dev(sch); | |
1424 | struct Qdisc *qdisc; | |
1425 | unsigned int i; | |
1426 | ||
1427 | for (i = new_real_tx; i < dev->real_num_tx_queues; i++) { | |
d636fc5d | 1428 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc_sleeping); |
f7116fb4 JK |
1429 | /* Only update the default qdiscs we created, |
1430 | * qdiscs with handles are always hashed. | |
1431 | */ | |
1432 | if (qdisc != &noop_qdisc && !qdisc->handle) | |
1433 | qdisc_hash_del(qdisc); | |
1434 | } | |
1435 | for (i = dev->real_num_tx_queues; i < new_real_tx; i++) { | |
d636fc5d | 1436 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc_sleeping); |
f7116fb4 JK |
1437 | if (qdisc != &noop_qdisc && !qdisc->handle) |
1438 | qdisc_hash_add(qdisc, false); | |
1439 | } | |
1440 | #endif | |
1441 | } | |
1442 | EXPORT_SYMBOL(mq_change_real_num_tx); | |
1443 | ||
48bfd55e CW |
1444 | int dev_qdisc_change_tx_queue_len(struct net_device *dev) |
1445 | { | |
1446 | bool up = dev->flags & IFF_UP; | |
1447 | unsigned int i; | |
1448 | int ret = 0; | |
1449 | ||
1450 | if (up) | |
1451 | dev_deactivate(dev); | |
1452 | ||
1453 | for (i = 0; i < dev->num_tx_queues; i++) { | |
1454 | ret = qdisc_change_tx_queue_len(dev, &dev->_tx[i]); | |
1455 | ||
1456 | /* TODO: revert changes on a partial failure */ | |
1457 | if (ret) | |
1458 | break; | |
1459 | } | |
1460 | ||
1461 | if (up) | |
1462 | dev_activate(dev); | |
1463 | return ret; | |
1464 | } | |
1465 | ||
b0e1e646 DM |
1466 | static void dev_init_scheduler_queue(struct net_device *dev, |
1467 | struct netdev_queue *dev_queue, | |
e8a0464c | 1468 | void *_qdisc) |
b0e1e646 | 1469 | { |
e8a0464c DM |
1470 | struct Qdisc *qdisc = _qdisc; |
1471 | ||
46e5da40 | 1472 | rcu_assign_pointer(dev_queue->qdisc, qdisc); |
d636fc5d | 1473 | rcu_assign_pointer(dev_queue->qdisc_sleeping, qdisc); |
b0e1e646 DM |
1474 | } |
1475 | ||
1da177e4 LT |
1476 | void dev_init_scheduler(struct net_device *dev) |
1477 | { | |
5891cd5e | 1478 | rcu_assign_pointer(dev->qdisc, &noop_qdisc); |
e8a0464c | 1479 | netdev_for_each_tx_queue(dev, dev_init_scheduler_queue, &noop_qdisc); |
24824a09 ED |
1480 | if (dev_ingress_queue(dev)) |
1481 | dev_init_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); | |
1da177e4 | 1482 | |
cdeabbb8 | 1483 | timer_setup(&dev->watchdog_timer, dev_watchdog, 0); |
1da177e4 LT |
1484 | } |
1485 | ||
b0e1e646 DM |
1486 | void dev_shutdown(struct net_device *dev) |
1487 | { | |
e8a0464c | 1488 | netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc); |
24824a09 ED |
1489 | if (dev_ingress_queue(dev)) |
1490 | shutdown_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); | |
5891cd5e ED |
1491 | qdisc_put(rtnl_dereference(dev->qdisc)); |
1492 | rcu_assign_pointer(dev->qdisc, &noop_qdisc); | |
af356afa | 1493 | |
547b792c | 1494 | WARN_ON(timer_pending(&dev->watchdog_timer)); |
1da177e4 | 1495 | } |
292f1c7f | 1496 | |
2ffe0395 BZ |
1497 | /** |
1498 | * psched_ratecfg_precompute__() - Pre-compute values for reciprocal division | |
1499 | * @rate: Rate to compute reciprocal division values of | |
1500 | * @mult: Multiplier for reciprocal division | |
1501 | * @shift: Shift for reciprocal division | |
1502 | * | |
1503 | * The multiplier and shift for reciprocal division by rate are stored | |
1504 | * in mult and shift. | |
1505 | * | |
1506 | * The deal here is to replace a divide by a reciprocal one | |
1507 | * in fast path (a reciprocal divide is a multiply and a shift) | |
1508 | * | |
1509 | * Normal formula would be : | |
1510 | * time_in_ns = (NSEC_PER_SEC * len) / rate_bps | |
1511 | * | |
1512 | * We compute mult/shift to use instead : | |
1513 | * time_in_ns = (len * mult) >> shift; | |
1514 | * | |
1515 | * We try to get the highest possible mult value for accuracy, | |
1516 | * but have to make sure no overflows will ever happen. | |
1517 | * | |
1518 | * reciprocal_value() is not used here it doesn't handle 64-bit values. | |
1519 | */ | |
1520 | static void psched_ratecfg_precompute__(u64 rate, u32 *mult, u8 *shift) | |
1521 | { | |
1522 | u64 factor = NSEC_PER_SEC; | |
1523 | ||
1524 | *mult = 1; | |
1525 | *shift = 0; | |
1526 | ||
1527 | if (rate <= 0) | |
1528 | return; | |
1529 | ||
1530 | for (;;) { | |
1531 | *mult = div64_u64(factor, rate); | |
1532 | if (*mult & (1U << 31) || factor & (1ULL << 63)) | |
1533 | break; | |
1534 | factor <<= 1; | |
1535 | (*shift)++; | |
1536 | } | |
1537 | } | |
1538 | ||
01cb71d2 | 1539 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
1540 | const struct tc_ratespec *conf, |
1541 | u64 rate64) | |
292f1c7f | 1542 | { |
01cb71d2 ED |
1543 | memset(r, 0, sizeof(*r)); |
1544 | r->overhead = conf->overhead; | |
fb80445c | 1545 | r->mpu = conf->mpu; |
3e1e3aae | 1546 | r->rate_bytes_ps = max_t(u64, conf->rate, rate64); |
8a8e3d84 | 1547 | r->linklayer = (conf->linklayer & TC_LINKLAYER_MASK); |
2ffe0395 | 1548 | psched_ratecfg_precompute__(r->rate_bytes_ps, &r->mult, &r->shift); |
292f1c7f JP |
1549 | } |
1550 | EXPORT_SYMBOL(psched_ratecfg_precompute); | |
46209401 | 1551 | |
2ffe0395 BZ |
1552 | void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64) |
1553 | { | |
1554 | r->rate_pkts_ps = pktrate64; | |
1555 | psched_ratecfg_precompute__(r->rate_pkts_ps, &r->mult, &r->shift); | |
1556 | } | |
1557 | EXPORT_SYMBOL(psched_ppscfg_precompute); | |
1558 | ||
46209401 JP |
1559 | void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, |
1560 | struct tcf_proto *tp_head) | |
1561 | { | |
ed76f5ed VB |
1562 | /* Protected with chain0->filter_chain_lock. |
1563 | * Can't access chain directly because tp_head can be NULL. | |
1564 | */ | |
1565 | struct mini_Qdisc *miniq_old = | |
1566 | rcu_dereference_protected(*miniqp->p_miniq, 1); | |
46209401 JP |
1567 | struct mini_Qdisc *miniq; |
1568 | ||
1569 | if (!tp_head) { | |
1570 | RCU_INIT_POINTER(*miniqp->p_miniq, NULL); | |
26746382 | 1571 | } else { |
85c0c3eb | 1572 | miniq = miniq_old != &miniqp->miniq1 ? |
26746382 | 1573 | &miniqp->miniq1 : &miniqp->miniq2; |
46209401 | 1574 | |
26746382 SF |
1575 | /* We need to make sure that readers won't see the miniq |
1576 | * we are about to modify. So ensure that at least one RCU | |
1577 | * grace period has elapsed since the miniq was made | |
1578 | * inactive. | |
1579 | */ | |
1580 | if (IS_ENABLED(CONFIG_PREEMPT_RT)) | |
1581 | cond_synchronize_rcu(miniq->rcu_state); | |
1582 | else if (!poll_state_synchronize_rcu(miniq->rcu_state)) | |
1583 | synchronize_rcu_expedited(); | |
46209401 | 1584 | |
26746382 SF |
1585 | miniq->filter_list = tp_head; |
1586 | rcu_assign_pointer(*miniqp->p_miniq, miniq); | |
1587 | } | |
46209401 JP |
1588 | |
1589 | if (miniq_old) | |
26746382 | 1590 | /* This is counterpart of the rcu sync above. We need to |
46209401 JP |
1591 | * block potential new user of miniq_old until all readers |
1592 | * are not seeing it. | |
1593 | */ | |
26746382 | 1594 | miniq_old->rcu_state = start_poll_synchronize_rcu(); |
46209401 JP |
1595 | } |
1596 | EXPORT_SYMBOL(mini_qdisc_pair_swap); | |
1597 | ||
7d17c544 PB |
1598 | void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp, |
1599 | struct tcf_block *block) | |
1600 | { | |
1601 | miniqp->miniq1.block = block; | |
1602 | miniqp->miniq2.block = block; | |
1603 | } | |
1604 | EXPORT_SYMBOL(mini_qdisc_pair_block_init); | |
1605 | ||
46209401 JP |
1606 | void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, |
1607 | struct mini_Qdisc __rcu **p_miniq) | |
1608 | { | |
1609 | miniqp->miniq1.cpu_bstats = qdisc->cpu_bstats; | |
1610 | miniqp->miniq1.cpu_qstats = qdisc->cpu_qstats; | |
1611 | miniqp->miniq2.cpu_bstats = qdisc->cpu_bstats; | |
1612 | miniqp->miniq2.cpu_qstats = qdisc->cpu_qstats; | |
26746382 SF |
1613 | miniqp->miniq1.rcu_state = get_state_synchronize_rcu(); |
1614 | miniqp->miniq2.rcu_state = miniqp->miniq1.rcu_state; | |
46209401 JP |
1615 | miniqp->p_miniq = p_miniq; |
1616 | } | |
1617 | EXPORT_SYMBOL(mini_qdisc_pair_init); |