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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[people/ms/linux.git] / include / net / sch_generic.h
1 #ifndef __NET_SCHED_GENERIC_H
2 #define __NET_SCHED_GENERIC_H
3
4 #include <linux/netdevice.h>
5 #include <linux/types.h>
6 #include <linux/rcupdate.h>
7 #include <linux/pkt_sched.h>
8 #include <linux/pkt_cls.h>
9 #include <linux/percpu.h>
10 #include <linux/dynamic_queue_limits.h>
11 #include <net/gen_stats.h>
12 #include <net/rtnetlink.h>
13
14 struct Qdisc_ops;
15 struct qdisc_walker;
16 struct tcf_walker;
17 struct module;
18
19 struct qdisc_rate_table {
20 struct tc_ratespec rate;
21 u32 data[256];
22 struct qdisc_rate_table *next;
23 int refcnt;
24 };
25
26 enum qdisc_state_t {
27 __QDISC_STATE_SCHED,
28 __QDISC_STATE_DEACTIVATED,
29 __QDISC_STATE_THROTTLED,
30 };
31
32 /*
33 * following bits are only changed while qdisc lock is held
34 */
35 enum qdisc___state_t {
36 __QDISC___STATE_RUNNING = 1,
37 };
38
39 struct qdisc_size_table {
40 struct rcu_head rcu;
41 struct list_head list;
42 struct tc_sizespec szopts;
43 int refcnt;
44 u16 data[];
45 };
46
47 struct Qdisc {
48 int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
49 struct sk_buff * (*dequeue)(struct Qdisc *dev);
50 unsigned int flags;
51 #define TCQ_F_BUILTIN 1
52 #define TCQ_F_INGRESS 2
53 #define TCQ_F_CAN_BYPASS 4
54 #define TCQ_F_MQROOT 8
55 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
56 * q->dev_queue : It can test
57 * netif_xmit_frozen_or_stopped() before
58 * dequeueing next packet.
59 * Its true for MQ/MQPRIO slaves, or non
60 * multiqueue device.
61 */
62 #define TCQ_F_WARN_NONWC (1 << 16)
63 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
64 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
65 * qdisc_tree_decrease_qlen() should stop.
66 */
67 u32 limit;
68 const struct Qdisc_ops *ops;
69 struct qdisc_size_table __rcu *stab;
70 struct list_head list;
71 u32 handle;
72 u32 parent;
73 int (*reshape_fail)(struct sk_buff *skb,
74 struct Qdisc *q);
75
76 void *u32_node;
77
78 /* This field is deprecated, but it is still used by CBQ
79 * and it will live until better solution will be invented.
80 */
81 struct Qdisc *__parent;
82 struct netdev_queue *dev_queue;
83
84 struct gnet_stats_rate_est64 rate_est;
85 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
86 struct gnet_stats_queue __percpu *cpu_qstats;
87
88 struct Qdisc *next_sched;
89 struct sk_buff *gso_skb;
90 /*
91 * For performance sake on SMP, we put highly modified fields at the end
92 */
93 unsigned long state;
94 struct sk_buff_head q;
95 struct gnet_stats_basic_packed bstats;
96 unsigned int __state;
97 struct gnet_stats_queue qstats;
98 struct rcu_head rcu_head;
99 int padded;
100 atomic_t refcnt;
101
102 spinlock_t busylock ____cacheline_aligned_in_smp;
103 };
104
105 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
106 {
107 return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
108 }
109
110 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
111 {
112 if (qdisc_is_running(qdisc))
113 return false;
114 qdisc->__state |= __QDISC___STATE_RUNNING;
115 return true;
116 }
117
118 static inline void qdisc_run_end(struct Qdisc *qdisc)
119 {
120 qdisc->__state &= ~__QDISC___STATE_RUNNING;
121 }
122
123 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
124 {
125 return qdisc->flags & TCQ_F_ONETXQUEUE;
126 }
127
128 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
129 {
130 #ifdef CONFIG_BQL
131 /* Non-BQL migrated drivers will return 0, too. */
132 return dql_avail(&txq->dql);
133 #else
134 return 0;
135 #endif
136 }
137
138 static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
139 {
140 return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
141 }
142
143 static inline void qdisc_throttled(struct Qdisc *qdisc)
144 {
145 set_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
146 }
147
148 static inline void qdisc_unthrottled(struct Qdisc *qdisc)
149 {
150 clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
151 }
152
153 struct Qdisc_class_ops {
154 /* Child qdisc manipulation */
155 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
156 int (*graft)(struct Qdisc *, unsigned long cl,
157 struct Qdisc *, struct Qdisc **);
158 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
159 void (*qlen_notify)(struct Qdisc *, unsigned long);
160
161 /* Class manipulation routines */
162 unsigned long (*get)(struct Qdisc *, u32 classid);
163 void (*put)(struct Qdisc *, unsigned long);
164 int (*change)(struct Qdisc *, u32, u32,
165 struct nlattr **, unsigned long *);
166 int (*delete)(struct Qdisc *, unsigned long);
167 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
168
169 /* Filter manipulation */
170 struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long);
171 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
172 u32 classid);
173 void (*unbind_tcf)(struct Qdisc *, unsigned long);
174
175 /* rtnetlink specific */
176 int (*dump)(struct Qdisc *, unsigned long,
177 struct sk_buff *skb, struct tcmsg*);
178 int (*dump_stats)(struct Qdisc *, unsigned long,
179 struct gnet_dump *);
180 };
181
182 struct Qdisc_ops {
183 struct Qdisc_ops *next;
184 const struct Qdisc_class_ops *cl_ops;
185 char id[IFNAMSIZ];
186 int priv_size;
187
188 int (*enqueue)(struct sk_buff *, struct Qdisc *);
189 struct sk_buff * (*dequeue)(struct Qdisc *);
190 struct sk_buff * (*peek)(struct Qdisc *);
191 unsigned int (*drop)(struct Qdisc *);
192
193 int (*init)(struct Qdisc *, struct nlattr *arg);
194 void (*reset)(struct Qdisc *);
195 void (*destroy)(struct Qdisc *);
196 int (*change)(struct Qdisc *, struct nlattr *arg);
197 void (*attach)(struct Qdisc *);
198
199 int (*dump)(struct Qdisc *, struct sk_buff *);
200 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
201
202 struct module *owner;
203 };
204
205
206 struct tcf_result {
207 unsigned long class;
208 u32 classid;
209 };
210
211 struct tcf_proto_ops {
212 struct list_head head;
213 char kind[IFNAMSIZ];
214
215 int (*classify)(struct sk_buff *,
216 const struct tcf_proto *,
217 struct tcf_result *);
218 int (*init)(struct tcf_proto*);
219 bool (*destroy)(struct tcf_proto*, bool);
220
221 unsigned long (*get)(struct tcf_proto*, u32 handle);
222 int (*change)(struct net *net, struct sk_buff *,
223 struct tcf_proto*, unsigned long,
224 u32 handle, struct nlattr **,
225 unsigned long *, bool);
226 int (*delete)(struct tcf_proto*, unsigned long);
227 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
228
229 /* rtnetlink specific */
230 int (*dump)(struct net*, struct tcf_proto*, unsigned long,
231 struct sk_buff *skb, struct tcmsg*);
232
233 struct module *owner;
234 };
235
236 struct tcf_proto {
237 /* Fast access part */
238 struct tcf_proto __rcu *next;
239 void __rcu *root;
240 int (*classify)(struct sk_buff *,
241 const struct tcf_proto *,
242 struct tcf_result *);
243 __be16 protocol;
244
245 /* All the rest */
246 u32 prio;
247 u32 classid;
248 struct Qdisc *q;
249 void *data;
250 const struct tcf_proto_ops *ops;
251 struct rcu_head rcu;
252 };
253
254 struct qdisc_skb_cb {
255 unsigned int pkt_len;
256 u16 slave_dev_queue_mapping;
257 u16 tc_classid;
258 #define QDISC_CB_PRIV_LEN 20
259 unsigned char data[QDISC_CB_PRIV_LEN];
260 };
261
262 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
263 {
264 struct qdisc_skb_cb *qcb;
265
266 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
267 BUILD_BUG_ON(sizeof(qcb->data) < sz);
268 }
269
270 static inline int qdisc_qlen(const struct Qdisc *q)
271 {
272 return q->q.qlen;
273 }
274
275 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
276 {
277 return (struct qdisc_skb_cb *)skb->cb;
278 }
279
280 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
281 {
282 return &qdisc->q.lock;
283 }
284
285 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
286 {
287 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
288
289 return q;
290 }
291
292 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
293 {
294 return qdisc->dev_queue->qdisc_sleeping;
295 }
296
297 /* The qdisc root lock is a mechanism by which to top level
298 * of a qdisc tree can be locked from any qdisc node in the
299 * forest. This allows changing the configuration of some
300 * aspect of the qdisc tree while blocking out asynchronous
301 * qdisc access in the packet processing paths.
302 *
303 * It is only legal to do this when the root will not change
304 * on us. Otherwise we'll potentially lock the wrong qdisc
305 * root. This is enforced by holding the RTNL semaphore, which
306 * all users of this lock accessor must do.
307 */
308 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
309 {
310 struct Qdisc *root = qdisc_root(qdisc);
311
312 ASSERT_RTNL();
313 return qdisc_lock(root);
314 }
315
316 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
317 {
318 struct Qdisc *root = qdisc_root_sleeping(qdisc);
319
320 ASSERT_RTNL();
321 return qdisc_lock(root);
322 }
323
324 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
325 {
326 return qdisc->dev_queue->dev;
327 }
328
329 static inline void sch_tree_lock(const struct Qdisc *q)
330 {
331 spin_lock_bh(qdisc_root_sleeping_lock(q));
332 }
333
334 static inline void sch_tree_unlock(const struct Qdisc *q)
335 {
336 spin_unlock_bh(qdisc_root_sleeping_lock(q));
337 }
338
339 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
340 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
341
342 extern struct Qdisc noop_qdisc;
343 extern struct Qdisc_ops noop_qdisc_ops;
344 extern struct Qdisc_ops pfifo_fast_ops;
345 extern struct Qdisc_ops mq_qdisc_ops;
346 extern struct Qdisc_ops noqueue_qdisc_ops;
347 extern const struct Qdisc_ops *default_qdisc_ops;
348
349 struct Qdisc_class_common {
350 u32 classid;
351 struct hlist_node hnode;
352 };
353
354 struct Qdisc_class_hash {
355 struct hlist_head *hash;
356 unsigned int hashsize;
357 unsigned int hashmask;
358 unsigned int hashelems;
359 };
360
361 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
362 {
363 id ^= id >> 8;
364 id ^= id >> 4;
365 return id & mask;
366 }
367
368 static inline struct Qdisc_class_common *
369 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
370 {
371 struct Qdisc_class_common *cl;
372 unsigned int h;
373
374 h = qdisc_class_hash(id, hash->hashmask);
375 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
376 if (cl->classid == id)
377 return cl;
378 }
379 return NULL;
380 }
381
382 int qdisc_class_hash_init(struct Qdisc_class_hash *);
383 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
384 struct Qdisc_class_common *);
385 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
386 struct Qdisc_class_common *);
387 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
388 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
389
390 void dev_init_scheduler(struct net_device *dev);
391 void dev_shutdown(struct net_device *dev);
392 void dev_activate(struct net_device *dev);
393 void dev_deactivate(struct net_device *dev);
394 void dev_deactivate_many(struct list_head *head);
395 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
396 struct Qdisc *qdisc);
397 void qdisc_reset(struct Qdisc *qdisc);
398 void qdisc_destroy(struct Qdisc *qdisc);
399 void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
400 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
401 const struct Qdisc_ops *ops);
402 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
403 const struct Qdisc_ops *ops, u32 parentid);
404 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
405 const struct qdisc_size_table *stab);
406 bool tcf_destroy(struct tcf_proto *tp, bool force);
407 void tcf_destroy_chain(struct tcf_proto __rcu **fl);
408 int skb_do_redirect(struct sk_buff *);
409
410 /* Reset all TX qdiscs greater then index of a device. */
411 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
412 {
413 struct Qdisc *qdisc;
414
415 for (; i < dev->num_tx_queues; i++) {
416 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
417 if (qdisc) {
418 spin_lock_bh(qdisc_lock(qdisc));
419 qdisc_reset(qdisc);
420 spin_unlock_bh(qdisc_lock(qdisc));
421 }
422 }
423 }
424
425 static inline void qdisc_reset_all_tx(struct net_device *dev)
426 {
427 qdisc_reset_all_tx_gt(dev, 0);
428 }
429
430 /* Are all TX queues of the device empty? */
431 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
432 {
433 unsigned int i;
434
435 rcu_read_lock();
436 for (i = 0; i < dev->num_tx_queues; i++) {
437 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
438 const struct Qdisc *q = rcu_dereference(txq->qdisc);
439
440 if (q->q.qlen) {
441 rcu_read_unlock();
442 return false;
443 }
444 }
445 rcu_read_unlock();
446 return true;
447 }
448
449 /* Are any of the TX qdiscs changing? */
450 static inline bool qdisc_tx_changing(const struct net_device *dev)
451 {
452 unsigned int i;
453
454 for (i = 0; i < dev->num_tx_queues; i++) {
455 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
456 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
457 return true;
458 }
459 return false;
460 }
461
462 /* Is the device using the noop qdisc on all queues? */
463 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
464 {
465 unsigned int i;
466
467 for (i = 0; i < dev->num_tx_queues; i++) {
468 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
469 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
470 return false;
471 }
472 return true;
473 }
474
475 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
476 {
477 return qdisc_skb_cb(skb)->pkt_len;
478 }
479
480 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
481 enum net_xmit_qdisc_t {
482 __NET_XMIT_STOLEN = 0x00010000,
483 __NET_XMIT_BYPASS = 0x00020000,
484 };
485
486 #ifdef CONFIG_NET_CLS_ACT
487 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
488 #else
489 #define net_xmit_drop_count(e) (1)
490 #endif
491
492 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
493 const struct Qdisc *sch)
494 {
495 #ifdef CONFIG_NET_SCHED
496 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
497
498 if (stab)
499 __qdisc_calculate_pkt_len(skb, stab);
500 #endif
501 }
502
503 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
504 {
505 qdisc_calculate_pkt_len(skb, sch);
506 return sch->enqueue(skb, sch);
507 }
508
509 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
510 {
511 return q->flags & TCQ_F_CPUSTATS;
512 }
513
514 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
515 const struct sk_buff *skb)
516 {
517 bstats->bytes += qdisc_pkt_len(skb);
518 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
519 }
520
521 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
522 const struct sk_buff *skb)
523 {
524 u64_stats_update_begin(&bstats->syncp);
525 bstats_update(&bstats->bstats, skb);
526 u64_stats_update_end(&bstats->syncp);
527 }
528
529 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
530 const struct sk_buff *skb)
531 {
532 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
533 }
534
535 static inline void qdisc_bstats_update(struct Qdisc *sch,
536 const struct sk_buff *skb)
537 {
538 bstats_update(&sch->bstats, skb);
539 }
540
541 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
542 const struct sk_buff *skb)
543 {
544 sch->qstats.backlog -= qdisc_pkt_len(skb);
545 }
546
547 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
548 const struct sk_buff *skb)
549 {
550 sch->qstats.backlog += qdisc_pkt_len(skb);
551 }
552
553 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
554 {
555 sch->qstats.drops += count;
556 }
557
558 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
559 {
560 qstats->drops++;
561 }
562
563 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
564 {
565 qstats->overlimits++;
566 }
567
568 static inline void qdisc_qstats_drop(struct Qdisc *sch)
569 {
570 qstats_drop_inc(&sch->qstats);
571 }
572
573 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
574 {
575 qstats_drop_inc(this_cpu_ptr(sch->cpu_qstats));
576 }
577
578 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
579 {
580 sch->qstats.overlimits++;
581 }
582
583 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
584 struct sk_buff_head *list)
585 {
586 __skb_queue_tail(list, skb);
587 qdisc_qstats_backlog_inc(sch, skb);
588
589 return NET_XMIT_SUCCESS;
590 }
591
592 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
593 {
594 return __qdisc_enqueue_tail(skb, sch, &sch->q);
595 }
596
597 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
598 struct sk_buff_head *list)
599 {
600 struct sk_buff *skb = __skb_dequeue(list);
601
602 if (likely(skb != NULL)) {
603 qdisc_qstats_backlog_dec(sch, skb);
604 qdisc_bstats_update(sch, skb);
605 }
606
607 return skb;
608 }
609
610 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
611 {
612 return __qdisc_dequeue_head(sch, &sch->q);
613 }
614
615 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
616 struct sk_buff_head *list)
617 {
618 struct sk_buff *skb = __skb_dequeue(list);
619
620 if (likely(skb != NULL)) {
621 unsigned int len = qdisc_pkt_len(skb);
622 qdisc_qstats_backlog_dec(sch, skb);
623 kfree_skb(skb);
624 return len;
625 }
626
627 return 0;
628 }
629
630 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
631 {
632 return __qdisc_queue_drop_head(sch, &sch->q);
633 }
634
635 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
636 struct sk_buff_head *list)
637 {
638 struct sk_buff *skb = __skb_dequeue_tail(list);
639
640 if (likely(skb != NULL))
641 qdisc_qstats_backlog_dec(sch, skb);
642
643 return skb;
644 }
645
646 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
647 {
648 return __qdisc_dequeue_tail(sch, &sch->q);
649 }
650
651 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
652 {
653 return skb_peek(&sch->q);
654 }
655
656 /* generic pseudo peek method for non-work-conserving qdisc */
657 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
658 {
659 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
660 if (!sch->gso_skb) {
661 sch->gso_skb = sch->dequeue(sch);
662 if (sch->gso_skb)
663 /* it's still part of the queue */
664 sch->q.qlen++;
665 }
666
667 return sch->gso_skb;
668 }
669
670 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
671 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
672 {
673 struct sk_buff *skb = sch->gso_skb;
674
675 if (skb) {
676 sch->gso_skb = NULL;
677 sch->q.qlen--;
678 } else {
679 skb = sch->dequeue(sch);
680 }
681
682 return skb;
683 }
684
685 static inline void __qdisc_reset_queue(struct Qdisc *sch,
686 struct sk_buff_head *list)
687 {
688 /*
689 * We do not know the backlog in bytes of this list, it
690 * is up to the caller to correct it
691 */
692 __skb_queue_purge(list);
693 }
694
695 static inline void qdisc_reset_queue(struct Qdisc *sch)
696 {
697 __qdisc_reset_queue(sch, &sch->q);
698 sch->qstats.backlog = 0;
699 }
700
701 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
702 struct sk_buff_head *list)
703 {
704 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
705
706 if (likely(skb != NULL)) {
707 unsigned int len = qdisc_pkt_len(skb);
708 kfree_skb(skb);
709 return len;
710 }
711
712 return 0;
713 }
714
715 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
716 {
717 return __qdisc_queue_drop(sch, &sch->q);
718 }
719
720 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
721 {
722 kfree_skb(skb);
723 qdisc_qstats_drop(sch);
724
725 return NET_XMIT_DROP;
726 }
727
728 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
729 {
730 qdisc_qstats_drop(sch);
731
732 #ifdef CONFIG_NET_CLS_ACT
733 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
734 goto drop;
735
736 return NET_XMIT_SUCCESS;
737
738 drop:
739 #endif
740 kfree_skb(skb);
741 return NET_XMIT_DROP;
742 }
743
744 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
745 long it will take to send a packet given its size.
746 */
747 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
748 {
749 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
750 if (slot < 0)
751 slot = 0;
752 slot >>= rtab->rate.cell_log;
753 if (slot > 255)
754 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
755 return rtab->data[slot];
756 }
757
758 struct psched_ratecfg {
759 u64 rate_bytes_ps; /* bytes per second */
760 u32 mult;
761 u16 overhead;
762 u8 linklayer;
763 u8 shift;
764 };
765
766 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
767 unsigned int len)
768 {
769 len += r->overhead;
770
771 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
772 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
773
774 return ((u64)len * r->mult) >> r->shift;
775 }
776
777 void psched_ratecfg_precompute(struct psched_ratecfg *r,
778 const struct tc_ratespec *conf,
779 u64 rate64);
780
781 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
782 const struct psched_ratecfg *r)
783 {
784 memset(res, 0, sizeof(*res));
785
786 /* legacy struct tc_ratespec has a 32bit @rate field
787 * Qdisc using 64bit rate should add new attributes
788 * in order to maintain compatibility.
789 */
790 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
791
792 res->overhead = r->overhead;
793 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
794 }
795
796 #endif
Michael's Linux tree.