Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * net/sched/sch_generic.c Generic packet scheduler routines. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * Jamal Hadi Salim, <hadi@cyberus.ca> 990601 | |
11 | * - Ingress support | |
12 | */ | |
13 | ||
1da177e4 | 14 | #include <linux/bitops.h> |
1da177e4 LT |
15 | #include <linux/module.h> |
16 | #include <linux/types.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/string.h> | |
1da177e4 | 20 | #include <linux/errno.h> |
1da177e4 LT |
21 | #include <linux/netdevice.h> |
22 | #include <linux/skbuff.h> | |
23 | #include <linux/rtnetlink.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/rcupdate.h> | |
26 | #include <linux/list.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
07ce76aa | 28 | #include <linux/if_vlan.h> |
c5ad119f | 29 | #include <linux/skb_array.h> |
32d3e51a | 30 | #include <linux/if_macvlan.h> |
292f1c7f | 31 | #include <net/sch_generic.h> |
1da177e4 | 32 | #include <net/pkt_sched.h> |
7fee226a | 33 | #include <net/dst.h> |
e543002f | 34 | #include <trace/events/qdisc.h> |
f53c7239 | 35 | #include <net/xfrm.h> |
1da177e4 | 36 | |
34aedd3f | 37 | /* Qdisc to use by default */ |
38 | const struct Qdisc_ops *default_qdisc_ops = &pfifo_fast_ops; | |
39 | EXPORT_SYMBOL(default_qdisc_ops); | |
40 | ||
1da177e4 LT |
41 | /* Main transmission queue. */ |
42 | ||
0463d4ae | 43 | /* Modifications to data participating in scheduling must be protected with |
5fb66229 | 44 | * qdisc_lock(qdisc) spinlock. |
0463d4ae PM |
45 | * |
46 | * The idea is the following: | |
c7e4f3bb DM |
47 | * - enqueue, dequeue are serialized via qdisc root lock |
48 | * - ingress filtering is also serialized via qdisc root lock | |
0463d4ae | 49 | * - updates to tree and tree walking are only done under the rtnl mutex. |
1da177e4 | 50 | */ |
70e57d5e JF |
51 | |
52 | static inline struct sk_buff *__skb_dequeue_bad_txq(struct Qdisc *q) | |
53 | { | |
54 | const struct netdev_queue *txq = q->dev_queue; | |
55 | spinlock_t *lock = NULL; | |
56 | struct sk_buff *skb; | |
57 | ||
58 | if (q->flags & TCQ_F_NOLOCK) { | |
59 | lock = qdisc_lock(q); | |
60 | spin_lock(lock); | |
61 | } | |
62 | ||
63 | skb = skb_peek(&q->skb_bad_txq); | |
64 | if (skb) { | |
65 | /* check the reason of requeuing without tx lock first */ | |
66 | txq = skb_get_tx_queue(txq->dev, skb); | |
67 | if (!netif_xmit_frozen_or_stopped(txq)) { | |
68 | skb = __skb_dequeue(&q->skb_bad_txq); | |
69 | if (qdisc_is_percpu_stats(q)) { | |
70 | qdisc_qstats_cpu_backlog_dec(q, skb); | |
71 | qdisc_qstats_cpu_qlen_dec(q); | |
72 | } else { | |
73 | qdisc_qstats_backlog_dec(q, skb); | |
74 | q->q.qlen--; | |
75 | } | |
76 | } else { | |
77 | skb = NULL; | |
78 | } | |
79 | } | |
80 | ||
81 | if (lock) | |
82 | spin_unlock(lock); | |
83 | ||
84 | return skb; | |
85 | } | |
86 | ||
87 | static inline struct sk_buff *qdisc_dequeue_skb_bad_txq(struct Qdisc *q) | |
88 | { | |
89 | struct sk_buff *skb = skb_peek(&q->skb_bad_txq); | |
90 | ||
91 | if (unlikely(skb)) | |
92 | skb = __skb_dequeue_bad_txq(q); | |
93 | ||
94 | return skb; | |
95 | } | |
96 | ||
97 | static inline void qdisc_enqueue_skb_bad_txq(struct Qdisc *q, | |
98 | struct sk_buff *skb) | |
99 | { | |
100 | spinlock_t *lock = NULL; | |
101 | ||
102 | if (q->flags & TCQ_F_NOLOCK) { | |
103 | lock = qdisc_lock(q); | |
104 | spin_lock(lock); | |
105 | } | |
106 | ||
107 | __skb_queue_tail(&q->skb_bad_txq, skb); | |
108 | ||
109 | if (lock) | |
110 | spin_unlock(lock); | |
111 | } | |
112 | ||
a53851e2 | 113 | static inline int __dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q) |
c716a81a | 114 | { |
a53851e2 | 115 | __skb_queue_head(&q->gso_skb, skb); |
53e91503 | 116 | q->qstats.requeues++; |
a27758ff | 117 | qdisc_qstats_backlog_inc(q, skb); |
bbd8a0d3 | 118 | q->q.qlen++; /* it's still part of the queue */ |
37437bb2 | 119 | __netif_schedule(q); |
6252352d | 120 | |
c716a81a JHS |
121 | return 0; |
122 | } | |
123 | ||
a53851e2 JF |
124 | static inline int dev_requeue_skb_locked(struct sk_buff *skb, struct Qdisc *q) |
125 | { | |
126 | spinlock_t *lock = qdisc_lock(q); | |
127 | ||
128 | spin_lock(lock); | |
129 | __skb_queue_tail(&q->gso_skb, skb); | |
130 | spin_unlock(lock); | |
131 | ||
132 | qdisc_qstats_cpu_requeues_inc(q); | |
133 | qdisc_qstats_cpu_backlog_inc(q, skb); | |
134 | qdisc_qstats_cpu_qlen_inc(q); | |
135 | __netif_schedule(q); | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | static inline int dev_requeue_skb(struct sk_buff *skb, struct Qdisc *q) | |
141 | { | |
142 | if (q->flags & TCQ_F_NOLOCK) | |
143 | return dev_requeue_skb_locked(skb, q); | |
144 | else | |
145 | return __dev_requeue_skb(skb, q); | |
146 | } | |
147 | ||
55a93b3e ED |
148 | static void try_bulk_dequeue_skb(struct Qdisc *q, |
149 | struct sk_buff *skb, | |
b8358d70 JDB |
150 | const struct netdev_queue *txq, |
151 | int *packets) | |
5772e9a3 | 152 | { |
55a93b3e | 153 | int bytelimit = qdisc_avail_bulklimit(txq) - skb->len; |
5772e9a3 JDB |
154 | |
155 | while (bytelimit > 0) { | |
55a93b3e | 156 | struct sk_buff *nskb = q->dequeue(q); |
5772e9a3 | 157 | |
55a93b3e | 158 | if (!nskb) |
5772e9a3 JDB |
159 | break; |
160 | ||
55a93b3e ED |
161 | bytelimit -= nskb->len; /* covers GSO len */ |
162 | skb->next = nskb; | |
163 | skb = nskb; | |
b8358d70 | 164 | (*packets)++; /* GSO counts as one pkt */ |
5772e9a3 | 165 | } |
55a93b3e | 166 | skb->next = NULL; |
5772e9a3 JDB |
167 | } |
168 | ||
4d202a0d ED |
169 | /* This variant of try_bulk_dequeue_skb() makes sure |
170 | * all skbs in the chain are for the same txq | |
171 | */ | |
172 | static void try_bulk_dequeue_skb_slow(struct Qdisc *q, | |
173 | struct sk_buff *skb, | |
174 | int *packets) | |
175 | { | |
176 | int mapping = skb_get_queue_mapping(skb); | |
177 | struct sk_buff *nskb; | |
178 | int cnt = 0; | |
179 | ||
180 | do { | |
181 | nskb = q->dequeue(q); | |
182 | if (!nskb) | |
183 | break; | |
184 | if (unlikely(skb_get_queue_mapping(nskb) != mapping)) { | |
70e57d5e JF |
185 | qdisc_enqueue_skb_bad_txq(q, nskb); |
186 | ||
187 | if (qdisc_is_percpu_stats(q)) { | |
188 | qdisc_qstats_cpu_backlog_inc(q, nskb); | |
189 | qdisc_qstats_cpu_qlen_inc(q); | |
190 | } else { | |
191 | qdisc_qstats_backlog_inc(q, nskb); | |
192 | q->q.qlen++; | |
193 | } | |
4d202a0d ED |
194 | break; |
195 | } | |
196 | skb->next = nskb; | |
197 | skb = nskb; | |
198 | } while (++cnt < 8); | |
199 | (*packets) += cnt; | |
200 | skb->next = NULL; | |
201 | } | |
202 | ||
5772e9a3 JDB |
203 | /* Note that dequeue_skb can possibly return a SKB list (via skb->next). |
204 | * A requeued skb (via q->gso_skb) can also be a SKB list. | |
205 | */ | |
b8358d70 JDB |
206 | static struct sk_buff *dequeue_skb(struct Qdisc *q, bool *validate, |
207 | int *packets) | |
c716a81a | 208 | { |
1abbe139 | 209 | const struct netdev_queue *txq = q->dev_queue; |
fd8e8d1a | 210 | struct sk_buff *skb = NULL; |
554794de | 211 | |
b8358d70 | 212 | *packets = 1; |
a53851e2 JF |
213 | if (unlikely(!skb_queue_empty(&q->gso_skb))) { |
214 | spinlock_t *lock = NULL; | |
215 | ||
216 | if (q->flags & TCQ_F_NOLOCK) { | |
217 | lock = qdisc_lock(q); | |
218 | spin_lock(lock); | |
219 | } | |
220 | ||
221 | skb = skb_peek(&q->gso_skb); | |
222 | ||
223 | /* skb may be null if another cpu pulls gso_skb off in between | |
224 | * empty check and lock. | |
225 | */ | |
226 | if (!skb) { | |
227 | if (lock) | |
228 | spin_unlock(lock); | |
229 | goto validate; | |
230 | } | |
231 | ||
4d202a0d ED |
232 | /* skb in gso_skb were already validated */ |
233 | *validate = false; | |
f53c7239 SK |
234 | if (xfrm_offload(skb)) |
235 | *validate = true; | |
ebf05982 | 236 | /* check the reason of requeuing without tx lock first */ |
10c51b56 | 237 | txq = skb_get_tx_queue(txq->dev, skb); |
73466498 | 238 | if (!netif_xmit_frozen_or_stopped(txq)) { |
a53851e2 JF |
239 | skb = __skb_dequeue(&q->gso_skb); |
240 | if (qdisc_is_percpu_stats(q)) { | |
241 | qdisc_qstats_cpu_backlog_dec(q, skb); | |
242 | qdisc_qstats_cpu_qlen_dec(q); | |
243 | } else { | |
244 | qdisc_qstats_backlog_dec(q, skb); | |
245 | q->q.qlen--; | |
246 | } | |
247 | } else { | |
ebf05982 | 248 | skb = NULL; |
a53851e2 JF |
249 | } |
250 | if (lock) | |
251 | spin_unlock(lock); | |
e543002f | 252 | goto trace; |
4d202a0d | 253 | } |
a53851e2 | 254 | validate: |
4d202a0d | 255 | *validate = true; |
fd8e8d1a JF |
256 | |
257 | if ((q->flags & TCQ_F_ONETXQUEUE) && | |
258 | netif_xmit_frozen_or_stopped(txq)) | |
259 | return skb; | |
260 | ||
70e57d5e JF |
261 | skb = qdisc_dequeue_skb_bad_txq(q); |
262 | if (unlikely(skb)) | |
263 | goto bulk; | |
fd8e8d1a | 264 | skb = q->dequeue(q); |
4d202a0d ED |
265 | if (skb) { |
266 | bulk: | |
267 | if (qdisc_may_bulk(q)) | |
268 | try_bulk_dequeue_skb(q, skb, txq, packets); | |
269 | else | |
270 | try_bulk_dequeue_skb_slow(q, skb, packets); | |
ebf05982 | 271 | } |
e543002f JDB |
272 | trace: |
273 | trace_qdisc_dequeue(q, txq, *packets, skb); | |
c716a81a JHS |
274 | return skb; |
275 | } | |
276 | ||
10297b99 | 277 | /* |
10770bc2 | 278 | * Transmit possibly several skbs, and handle the return status as |
f9eb8aea | 279 | * required. Owning running seqcount bit guarantees that |
10770bc2 | 280 | * only one CPU can execute this function. |
6c1361a6 KK |
281 | * |
282 | * Returns to the caller: | |
29b86cda JF |
283 | * false - hardware queue frozen backoff |
284 | * true - feel free to send more pkts | |
6c1361a6 | 285 | */ |
29b86cda JF |
286 | bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, |
287 | struct net_device *dev, struct netdev_queue *txq, | |
288 | spinlock_t *root_lock, bool validate) | |
1da177e4 | 289 | { |
5f1a485d | 290 | int ret = NETDEV_TX_BUSY; |
f53c7239 | 291 | bool again = false; |
7698b4fc DM |
292 | |
293 | /* And release qdisc */ | |
6b3ba914 JF |
294 | if (root_lock) |
295 | spin_unlock(root_lock); | |
c716a81a | 296 | |
55a93b3e ED |
297 | /* Note that we validate skb (GSO, checksum, ...) outside of locks */ |
298 | if (validate) | |
f53c7239 SK |
299 | skb = validate_xmit_skb_list(skb, dev, &again); |
300 | ||
301 | #ifdef CONFIG_XFRM_OFFLOAD | |
302 | if (unlikely(again)) { | |
303 | if (root_lock) | |
304 | spin_lock(root_lock); | |
305 | ||
306 | dev_requeue_skb(skb, q); | |
307 | return false; | |
308 | } | |
309 | #endif | |
572a9d7b | 310 | |
3dcd493f | 311 | if (likely(skb)) { |
55a93b3e ED |
312 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
313 | if (!netif_xmit_frozen_or_stopped(txq)) | |
314 | skb = dev_hard_start_xmit(skb, dev, txq, &ret); | |
c716a81a | 315 | |
55a93b3e | 316 | HARD_TX_UNLOCK(dev, txq); |
3dcd493f | 317 | } else { |
6b3ba914 JF |
318 | if (root_lock) |
319 | spin_lock(root_lock); | |
29b86cda | 320 | return true; |
55a93b3e | 321 | } |
6b3ba914 JF |
322 | |
323 | if (root_lock) | |
324 | spin_lock(root_lock); | |
c716a81a | 325 | |
29b86cda | 326 | if (!dev_xmit_complete(ret)) { |
6c1361a6 | 327 | /* Driver returned NETDEV_TX_BUSY - requeue skb */ |
e87cc472 JP |
328 | if (unlikely(ret != NETDEV_TX_BUSY)) |
329 | net_warn_ratelimited("BUG %s code %d qlen %d\n", | |
330 | dev->name, ret, q->q.qlen); | |
6c1361a6 | 331 | |
29b86cda JF |
332 | dev_requeue_skb(skb, q); |
333 | return false; | |
6c1361a6 | 334 | } |
c716a81a | 335 | |
73466498 | 336 | if (ret && netif_xmit_frozen_or_stopped(txq)) |
29b86cda | 337 | return false; |
37437bb2 | 338 | |
29b86cda | 339 | return true; |
1da177e4 LT |
340 | } |
341 | ||
bbd8a0d3 KK |
342 | /* |
343 | * NOTE: Called under qdisc_lock(q) with locally disabled BH. | |
344 | * | |
f9eb8aea | 345 | * running seqcount guarantees only one CPU can process |
bbd8a0d3 KK |
346 | * this qdisc at a time. qdisc_lock(q) serializes queue accesses for |
347 | * this queue. | |
348 | * | |
349 | * netif_tx_lock serializes accesses to device driver. | |
350 | * | |
351 | * qdisc_lock(q) and netif_tx_lock are mutually exclusive, | |
352 | * if one is grabbed, another must be free. | |
353 | * | |
354 | * Note, that this procedure can be called by a watchdog timer | |
355 | * | |
356 | * Returns to the caller: | |
357 | * 0 - queue is empty or throttled. | |
358 | * >0 - queue is not empty. | |
359 | * | |
360 | */ | |
29b86cda | 361 | static inline bool qdisc_restart(struct Qdisc *q, int *packets) |
bbd8a0d3 | 362 | { |
6b3ba914 | 363 | spinlock_t *root_lock = NULL; |
bbd8a0d3 KK |
364 | struct netdev_queue *txq; |
365 | struct net_device *dev; | |
bbd8a0d3 | 366 | struct sk_buff *skb; |
55a93b3e | 367 | bool validate; |
bbd8a0d3 KK |
368 | |
369 | /* Dequeue packet */ | |
b8358d70 | 370 | skb = dequeue_skb(q, &validate, packets); |
bbd8a0d3 | 371 | if (unlikely(!skb)) |
29b86cda | 372 | return false; |
10c51b56 | 373 | |
6b3ba914 JF |
374 | if (!(q->flags & TCQ_F_NOLOCK)) |
375 | root_lock = qdisc_lock(q); | |
376 | ||
bbd8a0d3 | 377 | dev = qdisc_dev(q); |
10c51b56 | 378 | txq = skb_get_tx_queue(dev, skb); |
bbd8a0d3 | 379 | |
55a93b3e | 380 | return sch_direct_xmit(skb, q, dev, txq, root_lock, validate); |
bbd8a0d3 KK |
381 | } |
382 | ||
37437bb2 | 383 | void __qdisc_run(struct Qdisc *q) |
48d83325 | 384 | { |
3d48b53f | 385 | int quota = dev_tx_weight; |
b8358d70 | 386 | int packets; |
2ba2506c | 387 | |
b8358d70 | 388 | while (qdisc_restart(q, &packets)) { |
2ba2506c | 389 | /* |
d5b8aa1d | 390 | * Ordered by possible occurrence: Postpone processing if |
391 | * 1. we've exceeded packet quota | |
392 | * 2. another process needs the CPU; | |
2ba2506c | 393 | */ |
b8358d70 JDB |
394 | quota -= packets; |
395 | if (quota <= 0 || need_resched()) { | |
37437bb2 | 396 | __netif_schedule(q); |
d90df3ad | 397 | break; |
2ba2506c HX |
398 | } |
399 | } | |
48d83325 HX |
400 | } |
401 | ||
9d21493b ED |
402 | unsigned long dev_trans_start(struct net_device *dev) |
403 | { | |
07ce76aa | 404 | unsigned long val, res; |
9d21493b ED |
405 | unsigned int i; |
406 | ||
07ce76aa | 407 | if (is_vlan_dev(dev)) |
408 | dev = vlan_dev_real_dev(dev); | |
32d3e51a CD |
409 | else if (netif_is_macvlan(dev)) |
410 | dev = macvlan_dev_real_dev(dev); | |
9b36627a FW |
411 | res = netdev_get_tx_queue(dev, 0)->trans_start; |
412 | for (i = 1; i < dev->num_tx_queues; i++) { | |
9d21493b ED |
413 | val = netdev_get_tx_queue(dev, i)->trans_start; |
414 | if (val && time_after(val, res)) | |
415 | res = val; | |
416 | } | |
07ce76aa | 417 | |
9d21493b ED |
418 | return res; |
419 | } | |
420 | EXPORT_SYMBOL(dev_trans_start); | |
421 | ||
cdeabbb8 | 422 | static void dev_watchdog(struct timer_list *t) |
1da177e4 | 423 | { |
cdeabbb8 | 424 | struct net_device *dev = from_timer(dev, t, watchdog_timer); |
1da177e4 | 425 | |
932ff279 | 426 | netif_tx_lock(dev); |
e8a0464c | 427 | if (!qdisc_tx_is_noop(dev)) { |
1da177e4 LT |
428 | if (netif_device_present(dev) && |
429 | netif_running(dev) && | |
430 | netif_carrier_ok(dev)) { | |
9d21493b | 431 | int some_queue_timedout = 0; |
e8a0464c | 432 | unsigned int i; |
9d21493b | 433 | unsigned long trans_start; |
e8a0464c DM |
434 | |
435 | for (i = 0; i < dev->num_tx_queues; i++) { | |
436 | struct netdev_queue *txq; | |
437 | ||
438 | txq = netdev_get_tx_queue(dev, i); | |
9b36627a | 439 | trans_start = txq->trans_start; |
73466498 | 440 | if (netif_xmit_stopped(txq) && |
9d21493b ED |
441 | time_after(jiffies, (trans_start + |
442 | dev->watchdog_timeo))) { | |
443 | some_queue_timedout = 1; | |
ccf5ff69 | 444 | txq->trans_timeout++; |
e8a0464c DM |
445 | break; |
446 | } | |
447 | } | |
338f7566 | 448 | |
9d21493b | 449 | if (some_queue_timedout) { |
9d21493b | 450 | WARN_ONCE(1, KERN_INFO "NETDEV WATCHDOG: %s (%s): transmit queue %u timed out\n", |
3019de12 | 451 | dev->name, netdev_drivername(dev), i); |
d314774c | 452 | dev->netdev_ops->ndo_tx_timeout(dev); |
1da177e4 | 453 | } |
e8a0464c DM |
454 | if (!mod_timer(&dev->watchdog_timer, |
455 | round_jiffies(jiffies + | |
456 | dev->watchdog_timeo))) | |
1da177e4 LT |
457 | dev_hold(dev); |
458 | } | |
459 | } | |
932ff279 | 460 | netif_tx_unlock(dev); |
1da177e4 LT |
461 | |
462 | dev_put(dev); | |
463 | } | |
464 | ||
1da177e4 LT |
465 | void __netdev_watchdog_up(struct net_device *dev) |
466 | { | |
d314774c | 467 | if (dev->netdev_ops->ndo_tx_timeout) { |
1da177e4 LT |
468 | if (dev->watchdog_timeo <= 0) |
469 | dev->watchdog_timeo = 5*HZ; | |
60468d5b VP |
470 | if (!mod_timer(&dev->watchdog_timer, |
471 | round_jiffies(jiffies + dev->watchdog_timeo))) | |
1da177e4 LT |
472 | dev_hold(dev); |
473 | } | |
474 | } | |
475 | ||
476 | static void dev_watchdog_up(struct net_device *dev) | |
477 | { | |
1da177e4 | 478 | __netdev_watchdog_up(dev); |
1da177e4 LT |
479 | } |
480 | ||
481 | static void dev_watchdog_down(struct net_device *dev) | |
482 | { | |
932ff279 | 483 | netif_tx_lock_bh(dev); |
1da177e4 | 484 | if (del_timer(&dev->watchdog_timer)) |
15333061 | 485 | dev_put(dev); |
932ff279 | 486 | netif_tx_unlock_bh(dev); |
1da177e4 LT |
487 | } |
488 | ||
bea3348e SH |
489 | /** |
490 | * netif_carrier_on - set carrier | |
491 | * @dev: network device | |
492 | * | |
493 | * Device has detected that carrier. | |
494 | */ | |
0a242efc DV |
495 | void netif_carrier_on(struct net_device *dev) |
496 | { | |
bfaae0f0 | 497 | if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
b4730016 DM |
498 | if (dev->reg_state == NETREG_UNINITIALIZED) |
499 | return; | |
2d3b479d | 500 | atomic_inc(&dev->carrier_changes); |
0a242efc | 501 | linkwatch_fire_event(dev); |
bfaae0f0 JG |
502 | if (netif_running(dev)) |
503 | __netdev_watchdog_up(dev); | |
504 | } | |
0a242efc | 505 | } |
62e3ba1b | 506 | EXPORT_SYMBOL(netif_carrier_on); |
0a242efc | 507 | |
bea3348e SH |
508 | /** |
509 | * netif_carrier_off - clear carrier | |
510 | * @dev: network device | |
511 | * | |
512 | * Device has detected loss of carrier. | |
513 | */ | |
0a242efc DV |
514 | void netif_carrier_off(struct net_device *dev) |
515 | { | |
b4730016 DM |
516 | if (!test_and_set_bit(__LINK_STATE_NOCARRIER, &dev->state)) { |
517 | if (dev->reg_state == NETREG_UNINITIALIZED) | |
518 | return; | |
2d3b479d | 519 | atomic_inc(&dev->carrier_changes); |
0a242efc | 520 | linkwatch_fire_event(dev); |
b4730016 | 521 | } |
0a242efc | 522 | } |
62e3ba1b | 523 | EXPORT_SYMBOL(netif_carrier_off); |
0a242efc | 524 | |
1da177e4 LT |
525 | /* "NOOP" scheduler: the best scheduler, recommended for all interfaces |
526 | under all circumstances. It is difficult to invent anything faster or | |
527 | cheaper. | |
528 | */ | |
529 | ||
520ac30f ED |
530 | static int noop_enqueue(struct sk_buff *skb, struct Qdisc *qdisc, |
531 | struct sk_buff **to_free) | |
1da177e4 | 532 | { |
520ac30f | 533 | __qdisc_drop(skb, to_free); |
1da177e4 LT |
534 | return NET_XMIT_CN; |
535 | } | |
536 | ||
82d567c2 | 537 | static struct sk_buff *noop_dequeue(struct Qdisc *qdisc) |
1da177e4 LT |
538 | { |
539 | return NULL; | |
540 | } | |
541 | ||
20fea08b | 542 | struct Qdisc_ops noop_qdisc_ops __read_mostly = { |
1da177e4 LT |
543 | .id = "noop", |
544 | .priv_size = 0, | |
545 | .enqueue = noop_enqueue, | |
546 | .dequeue = noop_dequeue, | |
99c0db26 | 547 | .peek = noop_dequeue, |
1da177e4 LT |
548 | .owner = THIS_MODULE, |
549 | }; | |
550 | ||
7698b4fc | 551 | static struct netdev_queue noop_netdev_queue = { |
7698b4fc | 552 | .qdisc = &noop_qdisc, |
9f3ffae0 | 553 | .qdisc_sleeping = &noop_qdisc, |
7698b4fc DM |
554 | }; |
555 | ||
1da177e4 LT |
556 | struct Qdisc noop_qdisc = { |
557 | .enqueue = noop_enqueue, | |
558 | .dequeue = noop_dequeue, | |
559 | .flags = TCQ_F_BUILTIN, | |
10297b99 | 560 | .ops = &noop_qdisc_ops, |
83874000 | 561 | .q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock), |
7698b4fc | 562 | .dev_queue = &noop_netdev_queue, |
f9eb8aea | 563 | .running = SEQCNT_ZERO(noop_qdisc.running), |
7b5edbc4 | 564 | .busylock = __SPIN_LOCK_UNLOCKED(noop_qdisc.busylock), |
1da177e4 | 565 | }; |
62e3ba1b | 566 | EXPORT_SYMBOL(noop_qdisc); |
1da177e4 | 567 | |
e63d7dfd AA |
568 | static int noqueue_init(struct Qdisc *qdisc, struct nlattr *opt, |
569 | struct netlink_ext_ack *extack) | |
d66d6c31 PS |
570 | { |
571 | /* register_qdisc() assigns a default of noop_enqueue if unset, | |
572 | * but __dev_queue_xmit() treats noqueue only as such | |
573 | * if this is NULL - so clear it here. */ | |
574 | qdisc->enqueue = NULL; | |
575 | return 0; | |
576 | } | |
577 | ||
578 | struct Qdisc_ops noqueue_qdisc_ops __read_mostly = { | |
1da177e4 LT |
579 | .id = "noqueue", |
580 | .priv_size = 0, | |
d66d6c31 | 581 | .init = noqueue_init, |
1da177e4 LT |
582 | .enqueue = noop_enqueue, |
583 | .dequeue = noop_dequeue, | |
99c0db26 | 584 | .peek = noop_dequeue, |
1da177e4 LT |
585 | .owner = THIS_MODULE, |
586 | }; | |
587 | ||
cc7ec456 ED |
588 | static const u8 prio2band[TC_PRIO_MAX + 1] = { |
589 | 1, 2, 2, 2, 1, 2, 0, 0 , 1, 1, 1, 1, 1, 1, 1, 1 | |
590 | }; | |
d3678b46 DM |
591 | |
592 | /* 3-band FIFO queue: old style, but should be a bit faster than | |
593 | generic prio+fifo combination. | |
594 | */ | |
595 | ||
596 | #define PFIFO_FAST_BANDS 3 | |
597 | ||
fd3ae5e8 KK |
598 | /* |
599 | * Private data for a pfifo_fast scheduler containing: | |
c5ad119f | 600 | * - rings for priority bands |
fd3ae5e8 KK |
601 | */ |
602 | struct pfifo_fast_priv { | |
c5ad119f | 603 | struct skb_array q[PFIFO_FAST_BANDS]; |
fd3ae5e8 KK |
604 | }; |
605 | ||
c5ad119f JF |
606 | static inline struct skb_array *band2list(struct pfifo_fast_priv *priv, |
607 | int band) | |
d3678b46 | 608 | { |
c5ad119f | 609 | return &priv->q[band]; |
d3678b46 DM |
610 | } |
611 | ||
520ac30f ED |
612 | static int pfifo_fast_enqueue(struct sk_buff *skb, struct Qdisc *qdisc, |
613 | struct sk_buff **to_free) | |
321090e7 | 614 | { |
c5ad119f JF |
615 | int band = prio2band[skb->priority & TC_PRIO_MAX]; |
616 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); | |
617 | struct skb_array *q = band2list(priv, band); | |
618 | int err; | |
821d24ae | 619 | |
c5ad119f JF |
620 | err = skb_array_produce(q, skb); |
621 | ||
622 | if (unlikely(err)) | |
623 | return qdisc_drop_cpu(skb, qdisc, to_free); | |
624 | ||
625 | qdisc_qstats_cpu_qlen_inc(qdisc); | |
626 | qdisc_qstats_cpu_backlog_inc(qdisc, skb); | |
627 | return NET_XMIT_SUCCESS; | |
1da177e4 LT |
628 | } |
629 | ||
cc7ec456 | 630 | static struct sk_buff *pfifo_fast_dequeue(struct Qdisc *qdisc) |
1da177e4 | 631 | { |
fd3ae5e8 | 632 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
c5ad119f JF |
633 | struct sk_buff *skb = NULL; |
634 | int band; | |
ec323368 | 635 | |
c5ad119f JF |
636 | for (band = 0; band < PFIFO_FAST_BANDS && !skb; band++) { |
637 | struct skb_array *q = band2list(priv, band); | |
fd3ae5e8 | 638 | |
c5ad119f JF |
639 | if (__skb_array_empty(q)) |
640 | continue; | |
fd3ae5e8 | 641 | |
c5ad119f JF |
642 | skb = skb_array_consume_bh(q); |
643 | } | |
644 | if (likely(skb)) { | |
645 | qdisc_qstats_cpu_backlog_dec(qdisc, skb); | |
646 | qdisc_bstats_cpu_update(qdisc, skb); | |
647 | qdisc_qstats_cpu_qlen_dec(qdisc); | |
d3678b46 | 648 | } |
f87a9c3d | 649 | |
c5ad119f | 650 | return skb; |
1da177e4 LT |
651 | } |
652 | ||
cc7ec456 | 653 | static struct sk_buff *pfifo_fast_peek(struct Qdisc *qdisc) |
99c0db26 | 654 | { |
fd3ae5e8 | 655 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
c5ad119f JF |
656 | struct sk_buff *skb = NULL; |
657 | int band; | |
fd3ae5e8 | 658 | |
c5ad119f JF |
659 | for (band = 0; band < PFIFO_FAST_BANDS && !skb; band++) { |
660 | struct skb_array *q = band2list(priv, band); | |
99c0db26 | 661 | |
c5ad119f | 662 | skb = __skb_array_peek(q); |
99c0db26 JP |
663 | } |
664 | ||
c5ad119f | 665 | return skb; |
99c0db26 JP |
666 | } |
667 | ||
cc7ec456 | 668 | static void pfifo_fast_reset(struct Qdisc *qdisc) |
1da177e4 | 669 | { |
c5ad119f | 670 | int i, band; |
fd3ae5e8 | 671 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
d3678b46 | 672 | |
c5ad119f JF |
673 | for (band = 0; band < PFIFO_FAST_BANDS; band++) { |
674 | struct skb_array *q = band2list(priv, band); | |
675 | struct sk_buff *skb; | |
d3678b46 | 676 | |
1df94c3c CW |
677 | /* NULL ring is possible if destroy path is due to a failed |
678 | * skb_array_init() in pfifo_fast_init() case. | |
679 | */ | |
680 | if (!q->ring.queue) | |
681 | continue; | |
682 | ||
c5ad119f JF |
683 | while ((skb = skb_array_consume_bh(q)) != NULL) |
684 | kfree_skb(skb); | |
685 | } | |
686 | ||
687 | for_each_possible_cpu(i) { | |
688 | struct gnet_stats_queue *q = per_cpu_ptr(qdisc->cpu_qstats, i); | |
689 | ||
690 | q->backlog = 0; | |
691 | q->qlen = 0; | |
692 | } | |
1da177e4 LT |
693 | } |
694 | ||
d3678b46 DM |
695 | static int pfifo_fast_dump(struct Qdisc *qdisc, struct sk_buff *skb) |
696 | { | |
697 | struct tc_prio_qopt opt = { .bands = PFIFO_FAST_BANDS }; | |
698 | ||
cc7ec456 | 699 | memcpy(&opt.priomap, prio2band, TC_PRIO_MAX + 1); |
1b34ec43 DM |
700 | if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) |
701 | goto nla_put_failure; | |
d3678b46 DM |
702 | return skb->len; |
703 | ||
704 | nla_put_failure: | |
705 | return -1; | |
706 | } | |
707 | ||
e63d7dfd AA |
708 | static int pfifo_fast_init(struct Qdisc *qdisc, struct nlattr *opt, |
709 | struct netlink_ext_ack *extack) | |
d3678b46 | 710 | { |
c5ad119f | 711 | unsigned int qlen = qdisc_dev(qdisc)->tx_queue_len; |
fd3ae5e8 | 712 | struct pfifo_fast_priv *priv = qdisc_priv(qdisc); |
c5ad119f JF |
713 | int prio; |
714 | ||
715 | /* guard against zero length rings */ | |
716 | if (!qlen) | |
717 | return -EINVAL; | |
d3678b46 | 718 | |
c5ad119f JF |
719 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) { |
720 | struct skb_array *q = band2list(priv, prio); | |
721 | int err; | |
722 | ||
723 | err = skb_array_init(q, qlen, GFP_KERNEL); | |
724 | if (err) | |
725 | return -ENOMEM; | |
726 | } | |
d3678b46 | 727 | |
23624935 ED |
728 | /* Can by-pass the queue discipline */ |
729 | qdisc->flags |= TCQ_F_CAN_BYPASS; | |
d3678b46 DM |
730 | return 0; |
731 | } | |
732 | ||
c5ad119f JF |
733 | static void pfifo_fast_destroy(struct Qdisc *sch) |
734 | { | |
735 | struct pfifo_fast_priv *priv = qdisc_priv(sch); | |
736 | int prio; | |
737 | ||
738 | for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) { | |
739 | struct skb_array *q = band2list(priv, prio); | |
740 | ||
741 | /* NULL ring is possible if destroy path is due to a failed | |
742 | * skb_array_init() in pfifo_fast_init() case. | |
743 | */ | |
1df94c3c | 744 | if (!q->ring.queue) |
c5ad119f JF |
745 | continue; |
746 | /* Destroy ring but no need to kfree_skb because a call to | |
747 | * pfifo_fast_reset() has already done that work. | |
748 | */ | |
749 | ptr_ring_cleanup(&q->ring, NULL); | |
750 | } | |
751 | } | |
752 | ||
6ec1c69a | 753 | struct Qdisc_ops pfifo_fast_ops __read_mostly = { |
d3678b46 | 754 | .id = "pfifo_fast", |
fd3ae5e8 | 755 | .priv_size = sizeof(struct pfifo_fast_priv), |
d3678b46 DM |
756 | .enqueue = pfifo_fast_enqueue, |
757 | .dequeue = pfifo_fast_dequeue, | |
99c0db26 | 758 | .peek = pfifo_fast_peek, |
d3678b46 | 759 | .init = pfifo_fast_init, |
c5ad119f | 760 | .destroy = pfifo_fast_destroy, |
d3678b46 DM |
761 | .reset = pfifo_fast_reset, |
762 | .dump = pfifo_fast_dump, | |
1da177e4 | 763 | .owner = THIS_MODULE, |
c5ad119f | 764 | .static_flags = TCQ_F_NOLOCK | TCQ_F_CPUSTATS, |
1da177e4 | 765 | }; |
1f27cde3 | 766 | EXPORT_SYMBOL(pfifo_fast_ops); |
1da177e4 | 767 | |
23d3b8bf | 768 | static struct lock_class_key qdisc_tx_busylock; |
f9eb8aea | 769 | static struct lock_class_key qdisc_running_key; |
23d3b8bf | 770 | |
5ce2d488 | 771 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d0bd684d AA |
772 | const struct Qdisc_ops *ops, |
773 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
774 | { |
775 | void *p; | |
776 | struct Qdisc *sch; | |
d276055c | 777 | unsigned int size = QDISC_ALIGN(sizeof(*sch)) + ops->priv_size; |
3d54b82f | 778 | int err = -ENOBUFS; |
26aa0459 JSP |
779 | struct net_device *dev; |
780 | ||
781 | if (!dev_queue) { | |
d0bd684d | 782 | NL_SET_ERR_MSG(extack, "No device queue given"); |
26aa0459 JSP |
783 | err = -EINVAL; |
784 | goto errout; | |
785 | } | |
1da177e4 | 786 | |
26aa0459 | 787 | dev = dev_queue->dev; |
f2cd2d3e ED |
788 | p = kzalloc_node(size, GFP_KERNEL, |
789 | netdev_queue_numa_node_read(dev_queue)); | |
790 | ||
1da177e4 | 791 | if (!p) |
3d54b82f | 792 | goto errout; |
3d54b82f | 793 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); |
d276055c ED |
794 | /* if we got non aligned memory, ask more and do alignment ourself */ |
795 | if (sch != p) { | |
796 | kfree(p); | |
797 | p = kzalloc_node(size + QDISC_ALIGNTO - 1, GFP_KERNEL, | |
798 | netdev_queue_numa_node_read(dev_queue)); | |
799 | if (!p) | |
800 | goto errout; | |
801 | sch = (struct Qdisc *) QDISC_ALIGN((unsigned long) p); | |
802 | sch->padded = (char *) sch - (char *) p; | |
803 | } | |
a53851e2 | 804 | __skb_queue_head_init(&sch->gso_skb); |
70e57d5e | 805 | __skb_queue_head_init(&sch->skb_bad_txq); |
48da34b7 FW |
806 | qdisc_skb_head_init(&sch->q); |
807 | spin_lock_init(&sch->q.lock); | |
23d3b8bf | 808 | |
d59f5ffa JF |
809 | if (ops->static_flags & TCQ_F_CPUSTATS) { |
810 | sch->cpu_bstats = | |
811 | netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); | |
812 | if (!sch->cpu_bstats) | |
813 | goto errout1; | |
814 | ||
815 | sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); | |
816 | if (!sch->cpu_qstats) { | |
817 | free_percpu(sch->cpu_bstats); | |
818 | goto errout1; | |
819 | } | |
820 | } | |
821 | ||
79640a4c | 822 | spin_lock_init(&sch->busylock); |
23d3b8bf ED |
823 | lockdep_set_class(&sch->busylock, |
824 | dev->qdisc_tx_busylock ?: &qdisc_tx_busylock); | |
825 | ||
f9eb8aea ED |
826 | seqcount_init(&sch->running); |
827 | lockdep_set_class(&sch->running, | |
828 | dev->qdisc_running_key ?: &qdisc_running_key); | |
829 | ||
1da177e4 | 830 | sch->ops = ops; |
d59f5ffa | 831 | sch->flags = ops->static_flags; |
1da177e4 LT |
832 | sch->enqueue = ops->enqueue; |
833 | sch->dequeue = ops->dequeue; | |
bb949fbd | 834 | sch->dev_queue = dev_queue; |
23d3b8bf | 835 | dev_hold(dev); |
7b936405 | 836 | refcount_set(&sch->refcnt, 1); |
3d54b82f TG |
837 | |
838 | return sch; | |
d59f5ffa JF |
839 | errout1: |
840 | kfree(p); | |
3d54b82f | 841 | errout: |
01e123d7 | 842 | return ERR_PTR(err); |
3d54b82f TG |
843 | } |
844 | ||
3511c913 | 845 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 846 | const struct Qdisc_ops *ops, |
a38a9882 AA |
847 | unsigned int parentid, |
848 | struct netlink_ext_ack *extack) | |
3d54b82f TG |
849 | { |
850 | struct Qdisc *sch; | |
10297b99 | 851 | |
a38a9882 AA |
852 | if (!try_module_get(ops->owner)) { |
853 | NL_SET_ERR_MSG(extack, "Failed to increase module reference counter"); | |
166ee5b8 | 854 | return NULL; |
a38a9882 | 855 | } |
6da7c8fc | 856 | |
a38a9882 | 857 | sch = qdisc_alloc(dev_queue, ops, extack); |
166ee5b8 ED |
858 | if (IS_ERR(sch)) { |
859 | module_put(ops->owner); | |
860 | return NULL; | |
861 | } | |
9f9afec4 | 862 | sch->parent = parentid; |
3d54b82f | 863 | |
a38a9882 | 864 | if (!ops->init || ops->init(sch, NULL, extack) == 0) |
1da177e4 LT |
865 | return sch; |
866 | ||
0fbbeb1b | 867 | qdisc_destroy(sch); |
1da177e4 LT |
868 | return NULL; |
869 | } | |
62e3ba1b | 870 | EXPORT_SYMBOL(qdisc_create_dflt); |
1da177e4 | 871 | |
5fb66229 | 872 | /* Under qdisc_lock(qdisc) and BH! */ |
1da177e4 LT |
873 | |
874 | void qdisc_reset(struct Qdisc *qdisc) | |
875 | { | |
20fea08b | 876 | const struct Qdisc_ops *ops = qdisc->ops; |
a53851e2 | 877 | struct sk_buff *skb, *tmp; |
1da177e4 LT |
878 | |
879 | if (ops->reset) | |
880 | ops->reset(qdisc); | |
67305ebc | 881 | |
a53851e2 JF |
882 | skb_queue_walk_safe(&qdisc->gso_skb, skb, tmp) { |
883 | __skb_unlink(skb, &qdisc->gso_skb); | |
884 | kfree_skb_list(skb); | |
bbd8a0d3 | 885 | } |
a53851e2 | 886 | |
70e57d5e JF |
887 | skb_queue_walk_safe(&qdisc->skb_bad_txq, skb, tmp) { |
888 | __skb_unlink(skb, &qdisc->skb_bad_txq); | |
889 | kfree_skb_list(skb); | |
890 | } | |
891 | ||
4d202a0d | 892 | qdisc->q.qlen = 0; |
c8e18129 | 893 | qdisc->qstats.backlog = 0; |
1da177e4 | 894 | } |
62e3ba1b | 895 | EXPORT_SYMBOL(qdisc_reset); |
1da177e4 | 896 | |
752fbcc3 | 897 | static void qdisc_free(struct Qdisc *qdisc) |
5d944c64 | 898 | { |
73c20a8b | 899 | if (qdisc_is_percpu_stats(qdisc)) { |
22e0f8b9 | 900 | free_percpu(qdisc->cpu_bstats); |
73c20a8b JF |
901 | free_percpu(qdisc->cpu_qstats); |
902 | } | |
22e0f8b9 | 903 | |
5d944c64 ED |
904 | kfree((char *) qdisc - qdisc->padded); |
905 | } | |
906 | ||
1e0d5a57 | 907 | void qdisc_destroy(struct Qdisc *qdisc) |
1da177e4 | 908 | { |
8a34c5dc | 909 | const struct Qdisc_ops *ops = qdisc->ops; |
a53851e2 | 910 | struct sk_buff *skb, *tmp; |
8a34c5dc | 911 | |
1e0d5a57 | 912 | if (qdisc->flags & TCQ_F_BUILTIN || |
7b936405 | 913 | !refcount_dec_and_test(&qdisc->refcnt)) |
1e0d5a57 DM |
914 | return; |
915 | ||
3a682fbd | 916 | #ifdef CONFIG_NET_SCHED |
59cc1f61 | 917 | qdisc_hash_del(qdisc); |
f6e0b239 | 918 | |
a2da570d | 919 | qdisc_put_stab(rtnl_dereference(qdisc->stab)); |
3a682fbd | 920 | #endif |
1c0d32fd | 921 | gen_kill_estimator(&qdisc->rate_est); |
8a34c5dc DM |
922 | if (ops->reset) |
923 | ops->reset(qdisc); | |
924 | if (ops->destroy) | |
925 | ops->destroy(qdisc); | |
926 | ||
927 | module_put(ops->owner); | |
928 | dev_put(qdisc_dev(qdisc)); | |
929 | ||
a53851e2 JF |
930 | skb_queue_walk_safe(&qdisc->gso_skb, skb, tmp) { |
931 | __skb_unlink(skb, &qdisc->gso_skb); | |
932 | kfree_skb_list(skb); | |
933 | } | |
934 | ||
70e57d5e JF |
935 | skb_queue_walk_safe(&qdisc->skb_bad_txq, skb, tmp) { |
936 | __skb_unlink(skb, &qdisc->skb_bad_txq); | |
937 | kfree_skb_list(skb); | |
938 | } | |
939 | ||
752fbcc3 | 940 | qdisc_free(qdisc); |
1da177e4 | 941 | } |
62e3ba1b | 942 | EXPORT_SYMBOL(qdisc_destroy); |
1da177e4 | 943 | |
589983cd PM |
944 | /* Attach toplevel qdisc to device queue. */ |
945 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
946 | struct Qdisc *qdisc) | |
947 | { | |
948 | struct Qdisc *oqdisc = dev_queue->qdisc_sleeping; | |
949 | spinlock_t *root_lock; | |
950 | ||
951 | root_lock = qdisc_lock(oqdisc); | |
952 | spin_lock_bh(root_lock); | |
953 | ||
589983cd PM |
954 | /* ... and graft new one */ |
955 | if (qdisc == NULL) | |
956 | qdisc = &noop_qdisc; | |
957 | dev_queue->qdisc_sleeping = qdisc; | |
958 | rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc); | |
959 | ||
960 | spin_unlock_bh(root_lock); | |
961 | ||
962 | return oqdisc; | |
963 | } | |
b8970f0b | 964 | EXPORT_SYMBOL(dev_graft_qdisc); |
589983cd | 965 | |
e8a0464c DM |
966 | static void attach_one_default_qdisc(struct net_device *dev, |
967 | struct netdev_queue *dev_queue, | |
968 | void *_unused) | |
969 | { | |
3e692f21 PS |
970 | struct Qdisc *qdisc; |
971 | const struct Qdisc_ops *ops = default_qdisc_ops; | |
e8a0464c | 972 | |
3e692f21 PS |
973 | if (dev->priv_flags & IFF_NO_QUEUE) |
974 | ops = &noqueue_qdisc_ops; | |
975 | ||
a38a9882 | 976 | qdisc = qdisc_create_dflt(dev_queue, ops, TC_H_ROOT, NULL); |
3e692f21 PS |
977 | if (!qdisc) { |
978 | netdev_info(dev, "activation failed\n"); | |
979 | return; | |
e8a0464c | 980 | } |
3e692f21 | 981 | if (!netif_is_multiqueue(dev)) |
4eaf3b84 | 982 | qdisc->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; |
e8a0464c DM |
983 | dev_queue->qdisc_sleeping = qdisc; |
984 | } | |
985 | ||
6ec1c69a DM |
986 | static void attach_default_qdiscs(struct net_device *dev) |
987 | { | |
988 | struct netdev_queue *txq; | |
989 | struct Qdisc *qdisc; | |
990 | ||
991 | txq = netdev_get_tx_queue(dev, 0); | |
992 | ||
4b469955 | 993 | if (!netif_is_multiqueue(dev) || |
4b469955 | 994 | dev->priv_flags & IFF_NO_QUEUE) { |
6ec1c69a DM |
995 | netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL); |
996 | dev->qdisc = txq->qdisc_sleeping; | |
551143d8 | 997 | qdisc_refcount_inc(dev->qdisc); |
6ec1c69a | 998 | } else { |
a38a9882 | 999 | qdisc = qdisc_create_dflt(txq, &mq_qdisc_ops, TC_H_ROOT, NULL); |
6ec1c69a | 1000 | if (qdisc) { |
6ec1c69a | 1001 | dev->qdisc = qdisc; |
e57a784d | 1002 | qdisc->ops->attach(qdisc); |
6ec1c69a DM |
1003 | } |
1004 | } | |
59cc1f61 | 1005 | #ifdef CONFIG_NET_SCHED |
92f91706 | 1006 | if (dev->qdisc != &noop_qdisc) |
49b49971 | 1007 | qdisc_hash_add(dev->qdisc, false); |
59cc1f61 | 1008 | #endif |
6ec1c69a DM |
1009 | } |
1010 | ||
e8a0464c DM |
1011 | static void transition_one_qdisc(struct net_device *dev, |
1012 | struct netdev_queue *dev_queue, | |
1013 | void *_need_watchdog) | |
1014 | { | |
83874000 | 1015 | struct Qdisc *new_qdisc = dev_queue->qdisc_sleeping; |
e8a0464c DM |
1016 | int *need_watchdog_p = _need_watchdog; |
1017 | ||
a9312ae8 DM |
1018 | if (!(new_qdisc->flags & TCQ_F_BUILTIN)) |
1019 | clear_bit(__QDISC_STATE_DEACTIVATED, &new_qdisc->state); | |
1020 | ||
83874000 | 1021 | rcu_assign_pointer(dev_queue->qdisc, new_qdisc); |
3e692f21 | 1022 | if (need_watchdog_p) { |
9d21493b | 1023 | dev_queue->trans_start = 0; |
e8a0464c | 1024 | *need_watchdog_p = 1; |
9d21493b | 1025 | } |
e8a0464c DM |
1026 | } |
1027 | ||
1da177e4 LT |
1028 | void dev_activate(struct net_device *dev) |
1029 | { | |
e8a0464c | 1030 | int need_watchdog; |
b0e1e646 | 1031 | |
1da177e4 | 1032 | /* No queueing discipline is attached to device; |
6da7c8fc | 1033 | * create default one for devices, which need queueing |
1034 | * and noqueue_qdisc for virtual interfaces | |
1da177e4 LT |
1035 | */ |
1036 | ||
6ec1c69a DM |
1037 | if (dev->qdisc == &noop_qdisc) |
1038 | attach_default_qdiscs(dev); | |
af356afa | 1039 | |
cacaddf5 TC |
1040 | if (!netif_carrier_ok(dev)) |
1041 | /* Delay activation until next carrier-on event */ | |
1042 | return; | |
1043 | ||
e8a0464c DM |
1044 | need_watchdog = 0; |
1045 | netdev_for_each_tx_queue(dev, transition_one_qdisc, &need_watchdog); | |
24824a09 ED |
1046 | if (dev_ingress_queue(dev)) |
1047 | transition_one_qdisc(dev, dev_ingress_queue(dev), NULL); | |
e8a0464c DM |
1048 | |
1049 | if (need_watchdog) { | |
860e9538 | 1050 | netif_trans_update(dev); |
1da177e4 LT |
1051 | dev_watchdog_up(dev); |
1052 | } | |
b0e1e646 | 1053 | } |
b8970f0b | 1054 | EXPORT_SYMBOL(dev_activate); |
b0e1e646 | 1055 | |
e8a0464c DM |
1056 | static void dev_deactivate_queue(struct net_device *dev, |
1057 | struct netdev_queue *dev_queue, | |
1058 | void *_qdisc_default) | |
b0e1e646 | 1059 | { |
e8a0464c | 1060 | struct Qdisc *qdisc_default = _qdisc_default; |
970565bb | 1061 | struct Qdisc *qdisc; |
970565bb | 1062 | |
46e5da40 | 1063 | qdisc = rtnl_dereference(dev_queue->qdisc); |
b0e1e646 | 1064 | if (qdisc) { |
83874000 DM |
1065 | spin_lock_bh(qdisc_lock(qdisc)); |
1066 | ||
a9312ae8 DM |
1067 | if (!(qdisc->flags & TCQ_F_BUILTIN)) |
1068 | set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state); | |
1069 | ||
f7a54c13 | 1070 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
b0e1e646 | 1071 | qdisc_reset(qdisc); |
d3b753db | 1072 | |
83874000 | 1073 | spin_unlock_bh(qdisc_lock(qdisc)); |
b0e1e646 | 1074 | } |
1da177e4 LT |
1075 | } |
1076 | ||
4335cd2d | 1077 | static bool some_qdisc_is_busy(struct net_device *dev) |
e8a0464c DM |
1078 | { |
1079 | unsigned int i; | |
1080 | ||
1081 | for (i = 0; i < dev->num_tx_queues; i++) { | |
1082 | struct netdev_queue *dev_queue; | |
7698b4fc | 1083 | spinlock_t *root_lock; |
e2627c8c | 1084 | struct Qdisc *q; |
e8a0464c DM |
1085 | int val; |
1086 | ||
1087 | dev_queue = netdev_get_tx_queue(dev, i); | |
b9a3b110 | 1088 | q = dev_queue->qdisc_sleeping; |
e8a0464c | 1089 | |
6b3ba914 JF |
1090 | if (q->flags & TCQ_F_NOLOCK) { |
1091 | val = test_bit(__QDISC_STATE_SCHED, &q->state); | |
1092 | } else { | |
1093 | root_lock = qdisc_lock(q); | |
1094 | spin_lock_bh(root_lock); | |
e8a0464c | 1095 | |
6b3ba914 JF |
1096 | val = (qdisc_is_running(q) || |
1097 | test_bit(__QDISC_STATE_SCHED, &q->state)); | |
e8a0464c | 1098 | |
6b3ba914 JF |
1099 | spin_unlock_bh(root_lock); |
1100 | } | |
e8a0464c DM |
1101 | |
1102 | if (val) | |
1103 | return true; | |
1104 | } | |
1105 | return false; | |
1106 | } | |
1107 | ||
7bbde83b JF |
1108 | static void dev_qdisc_reset(struct net_device *dev, |
1109 | struct netdev_queue *dev_queue, | |
1110 | void *none) | |
1111 | { | |
1112 | struct Qdisc *qdisc = dev_queue->qdisc_sleeping; | |
1113 | ||
1114 | if (qdisc) | |
1115 | qdisc_reset(qdisc); | |
1116 | } | |
1117 | ||
3137663d ED |
1118 | /** |
1119 | * dev_deactivate_many - deactivate transmissions on several devices | |
1120 | * @head: list of devices to deactivate | |
1121 | * | |
1122 | * This function returns only when all outstanding transmissions | |
1123 | * have completed, unless all devices are in dismantle phase. | |
1124 | */ | |
44345724 | 1125 | void dev_deactivate_many(struct list_head *head) |
1da177e4 | 1126 | { |
44345724 | 1127 | struct net_device *dev; |
41a23b07 | 1128 | |
5cde2829 | 1129 | list_for_each_entry(dev, head, close_list) { |
44345724 OP |
1130 | netdev_for_each_tx_queue(dev, dev_deactivate_queue, |
1131 | &noop_qdisc); | |
1132 | if (dev_ingress_queue(dev)) | |
1133 | dev_deactivate_queue(dev, dev_ingress_queue(dev), | |
1134 | &noop_qdisc); | |
1135 | ||
1136 | dev_watchdog_down(dev); | |
1137 | } | |
1da177e4 | 1138 | |
3137663d ED |
1139 | /* Wait for outstanding qdisc-less dev_queue_xmit calls. |
1140 | * This is avoided if all devices are in dismantle phase : | |
1141 | * Caller will call synchronize_net() for us | |
1142 | */ | |
7bbde83b | 1143 | synchronize_net(); |
1da177e4 | 1144 | |
d4828d85 | 1145 | /* Wait for outstanding qdisc_run calls. */ |
7bbde83b | 1146 | list_for_each_entry(dev, head, close_list) { |
44345724 OP |
1147 | while (some_qdisc_is_busy(dev)) |
1148 | yield(); | |
7bbde83b JF |
1149 | /* The new qdisc is assigned at this point so we can safely |
1150 | * unwind stale skb lists and qdisc statistics | |
1151 | */ | |
1152 | netdev_for_each_tx_queue(dev, dev_qdisc_reset, NULL); | |
1153 | if (dev_ingress_queue(dev)) | |
1154 | dev_qdisc_reset(dev, dev_ingress_queue(dev), NULL); | |
1155 | } | |
44345724 OP |
1156 | } |
1157 | ||
1158 | void dev_deactivate(struct net_device *dev) | |
1159 | { | |
1160 | LIST_HEAD(single); | |
1161 | ||
5cde2829 | 1162 | list_add(&dev->close_list, &single); |
44345724 | 1163 | dev_deactivate_many(&single); |
5f04d506 | 1164 | list_del(&single); |
1da177e4 | 1165 | } |
b8970f0b | 1166 | EXPORT_SYMBOL(dev_deactivate); |
1da177e4 | 1167 | |
b0e1e646 DM |
1168 | static void dev_init_scheduler_queue(struct net_device *dev, |
1169 | struct netdev_queue *dev_queue, | |
e8a0464c | 1170 | void *_qdisc) |
b0e1e646 | 1171 | { |
e8a0464c DM |
1172 | struct Qdisc *qdisc = _qdisc; |
1173 | ||
46e5da40 | 1174 | rcu_assign_pointer(dev_queue->qdisc, qdisc); |
b0e1e646 | 1175 | dev_queue->qdisc_sleeping = qdisc; |
a53851e2 | 1176 | __skb_queue_head_init(&qdisc->gso_skb); |
70e57d5e | 1177 | __skb_queue_head_init(&qdisc->skb_bad_txq); |
b0e1e646 DM |
1178 | } |
1179 | ||
1da177e4 LT |
1180 | void dev_init_scheduler(struct net_device *dev) |
1181 | { | |
af356afa | 1182 | dev->qdisc = &noop_qdisc; |
e8a0464c | 1183 | netdev_for_each_tx_queue(dev, dev_init_scheduler_queue, &noop_qdisc); |
24824a09 ED |
1184 | if (dev_ingress_queue(dev)) |
1185 | dev_init_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); | |
1da177e4 | 1186 | |
cdeabbb8 | 1187 | timer_setup(&dev->watchdog_timer, dev_watchdog, 0); |
1da177e4 LT |
1188 | } |
1189 | ||
e8a0464c DM |
1190 | static void shutdown_scheduler_queue(struct net_device *dev, |
1191 | struct netdev_queue *dev_queue, | |
1192 | void *_qdisc_default) | |
1da177e4 | 1193 | { |
b0e1e646 | 1194 | struct Qdisc *qdisc = dev_queue->qdisc_sleeping; |
e8a0464c | 1195 | struct Qdisc *qdisc_default = _qdisc_default; |
b0e1e646 DM |
1196 | |
1197 | if (qdisc) { | |
f7a54c13 | 1198 | rcu_assign_pointer(dev_queue->qdisc, qdisc_default); |
b0e1e646 | 1199 | dev_queue->qdisc_sleeping = qdisc_default; |
1da177e4 | 1200 | |
1da177e4 | 1201 | qdisc_destroy(qdisc); |
10297b99 | 1202 | } |
b0e1e646 DM |
1203 | } |
1204 | ||
1205 | void dev_shutdown(struct net_device *dev) | |
1206 | { | |
e8a0464c | 1207 | netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc); |
24824a09 ED |
1208 | if (dev_ingress_queue(dev)) |
1209 | shutdown_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc); | |
af356afa PM |
1210 | qdisc_destroy(dev->qdisc); |
1211 | dev->qdisc = &noop_qdisc; | |
1212 | ||
547b792c | 1213 | WARN_ON(timer_pending(&dev->watchdog_timer)); |
1da177e4 | 1214 | } |
292f1c7f | 1215 | |
01cb71d2 | 1216 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
1217 | const struct tc_ratespec *conf, |
1218 | u64 rate64) | |
292f1c7f | 1219 | { |
01cb71d2 ED |
1220 | memset(r, 0, sizeof(*r)); |
1221 | r->overhead = conf->overhead; | |
3e1e3aae | 1222 | r->rate_bytes_ps = max_t(u64, conf->rate, rate64); |
8a8e3d84 | 1223 | r->linklayer = (conf->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
1224 | r->mult = 1; |
1225 | /* | |
130d3d68 ED |
1226 | * The deal here is to replace a divide by a reciprocal one |
1227 | * in fast path (a reciprocal divide is a multiply and a shift) | |
1228 | * | |
1229 | * Normal formula would be : | |
1230 | * time_in_ns = (NSEC_PER_SEC * len) / rate_bps | |
1231 | * | |
1232 | * We compute mult/shift to use instead : | |
1233 | * time_in_ns = (len * mult) >> shift; | |
1234 | * | |
1235 | * We try to get the highest possible mult value for accuracy, | |
1236 | * but have to make sure no overflows will ever happen. | |
292f1c7f | 1237 | */ |
130d3d68 ED |
1238 | if (r->rate_bytes_ps > 0) { |
1239 | u64 factor = NSEC_PER_SEC; | |
1240 | ||
1241 | for (;;) { | |
1242 | r->mult = div64_u64(factor, r->rate_bytes_ps); | |
1243 | if (r->mult & (1U << 31) || factor & (1ULL << 63)) | |
292f1c7f | 1244 | break; |
130d3d68 ED |
1245 | factor <<= 1; |
1246 | r->shift++; | |
292f1c7f | 1247 | } |
292f1c7f JP |
1248 | } |
1249 | } | |
1250 | EXPORT_SYMBOL(psched_ratecfg_precompute); | |
46209401 JP |
1251 | |
1252 | static void mini_qdisc_rcu_func(struct rcu_head *head) | |
1253 | { | |
1254 | } | |
1255 | ||
1256 | void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, | |
1257 | struct tcf_proto *tp_head) | |
1258 | { | |
1259 | struct mini_Qdisc *miniq_old = rtnl_dereference(*miniqp->p_miniq); | |
1260 | struct mini_Qdisc *miniq; | |
1261 | ||
1262 | if (!tp_head) { | |
1263 | RCU_INIT_POINTER(*miniqp->p_miniq, NULL); | |
b2fb01f4 CW |
1264 | /* Wait for flying RCU callback before it is freed. */ |
1265 | rcu_barrier_bh(); | |
46209401 JP |
1266 | return; |
1267 | } | |
1268 | ||
1269 | miniq = !miniq_old || miniq_old == &miniqp->miniq2 ? | |
1270 | &miniqp->miniq1 : &miniqp->miniq2; | |
1271 | ||
1272 | /* We need to make sure that readers won't see the miniq | |
1273 | * we are about to modify. So wait until previous call_rcu_bh callback | |
1274 | * is done. | |
1275 | */ | |
1276 | rcu_barrier_bh(); | |
1277 | miniq->filter_list = tp_head; | |
1278 | rcu_assign_pointer(*miniqp->p_miniq, miniq); | |
1279 | ||
1280 | if (miniq_old) | |
b2fb01f4 | 1281 | /* This is counterpart of the rcu barriers above. We need to |
46209401 JP |
1282 | * block potential new user of miniq_old until all readers |
1283 | * are not seeing it. | |
1284 | */ | |
1285 | call_rcu_bh(&miniq_old->rcu, mini_qdisc_rcu_func); | |
1286 | } | |
1287 | EXPORT_SYMBOL(mini_qdisc_pair_swap); | |
1288 | ||
1289 | void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, | |
1290 | struct mini_Qdisc __rcu **p_miniq) | |
1291 | { | |
1292 | miniqp->miniq1.cpu_bstats = qdisc->cpu_bstats; | |
1293 | miniqp->miniq1.cpu_qstats = qdisc->cpu_qstats; | |
1294 | miniqp->miniq2.cpu_bstats = qdisc->cpu_bstats; | |
1295 | miniqp->miniq2.cpu_qstats = qdisc->cpu_qstats; | |
1296 | miniqp->p_miniq = p_miniq; | |
1297 | } | |
1298 | EXPORT_SYMBOL(mini_qdisc_pair_init); |