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ARM: vexpress: Remove non-DT code
[linux-2.6/btrfs-unstable.git] / include / net / sch_generic.h
blobd17ed6fb2f7043d84011fbf471b06e10bdf06db4
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 u32 limit;
65 const struct Qdisc_ops *ops;
66 struct qdisc_size_table __rcu *stab;
67 struct list_head list;
68 u32 handle;
69 u32 parent;
70 int (*reshape_fail)(struct sk_buff *skb,
71 struct Qdisc *q);
72
73 void *u32_node;
74
75 /* This field is deprecated, but it is still used by CBQ
76 * and it will live until better solution will be invented.
77 */
78 struct Qdisc *__parent;
79 struct netdev_queue *dev_queue;
80
81 struct gnet_stats_rate_est64 rate_est;
82 struct Qdisc *next_sched;
83 struct sk_buff *gso_skb;
84 /*
85 * For performance sake on SMP, we put highly modified fields at the end
86 */
87 unsigned long state;
88 struct sk_buff_head q;
89 union {
90 struct gnet_stats_basic_packed bstats;
91 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
92 } __packed;
93 unsigned int __state;
94 union {
95 struct gnet_stats_queue qstats;
96 struct gnet_stats_queue __percpu *cpu_qstats;
97 } __packed;
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 void (*destroy)(struct tcf_proto*);
220
221 unsigned long (*get)(struct tcf_proto*, u32 handle);
222 void (*put)(struct tcf_proto*, unsigned long);
223 int (*change)(struct net *net, struct sk_buff *,
224 struct tcf_proto*, unsigned long,
225 u32 handle, struct nlattr **,
226 unsigned long *, bool);
227 int (*delete)(struct tcf_proto*, unsigned long);
228 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
229
230 /* rtnetlink specific */
231 int (*dump)(struct net*, struct tcf_proto*, unsigned long,
232 struct sk_buff *skb, struct tcmsg*);
233
234 struct module *owner;
235 };
236
237 struct tcf_proto {
238 /* Fast access part */
239 struct tcf_proto __rcu *next;
240 void __rcu *root;
241 int (*classify)(struct sk_buff *,
242 const struct tcf_proto *,
243 struct tcf_result *);
244 __be16 protocol;
245
246 /* All the rest */
247 u32 prio;
248 u32 classid;
249 struct Qdisc *q;
250 void *data;
251 const struct tcf_proto_ops *ops;
252 struct rcu_head rcu;
253 };
254
255 struct qdisc_skb_cb {
256 unsigned int pkt_len;
257 u16 slave_dev_queue_mapping;
258 u16 _pad;
259 #define QDISC_CB_PRIV_LEN 20
260 unsigned char data[QDISC_CB_PRIV_LEN];
261 };
262
263 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
264 {
265 struct qdisc_skb_cb *qcb;
266
267 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
268 BUILD_BUG_ON(sizeof(qcb->data) < sz);
269 }
270
271 static inline int qdisc_qlen(const struct Qdisc *q)
272 {
273 return q->q.qlen;
274 }
275
276 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
277 {
278 return (struct qdisc_skb_cb *)skb->cb;
279 }
280
281 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
282 {
283 return &qdisc->q.lock;
284 }
285
286 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
287 {
288 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
289
290 return q;
291 }
292
293 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
294 {
295 return qdisc->dev_queue->qdisc_sleeping;
296 }
297
298 /* The qdisc root lock is a mechanism by which to top level
299 * of a qdisc tree can be locked from any qdisc node in the
300 * forest. This allows changing the configuration of some
301 * aspect of the qdisc tree while blocking out asynchronous
302 * qdisc access in the packet processing paths.
303 *
304 * It is only legal to do this when the root will not change
305 * on us. Otherwise we'll potentially lock the wrong qdisc
306 * root. This is enforced by holding the RTNL semaphore, which
307 * all users of this lock accessor must do.
308 */
309 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
310 {
311 struct Qdisc *root = qdisc_root(qdisc);
312
313 ASSERT_RTNL();
314 return qdisc_lock(root);
315 }
316
317 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
318 {
319 struct Qdisc *root = qdisc_root_sleeping(qdisc);
320
321 ASSERT_RTNL();
322 return qdisc_lock(root);
323 }
324
325 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
326 {
327 return qdisc->dev_queue->dev;
328 }
329
330 static inline void sch_tree_lock(const struct Qdisc *q)
331 {
332 spin_lock_bh(qdisc_root_sleeping_lock(q));
333 }
334
335 static inline void sch_tree_unlock(const struct Qdisc *q)
336 {
337 spin_unlock_bh(qdisc_root_sleeping_lock(q));
338 }
339
340 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
341 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
342
343 extern struct Qdisc noop_qdisc;
344 extern struct Qdisc_ops noop_qdisc_ops;
345 extern struct Qdisc_ops pfifo_fast_ops;
346 extern struct Qdisc_ops mq_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 void tcf_destroy(struct tcf_proto *tp);
407 void tcf_destroy_chain(struct tcf_proto __rcu **fl);
408
409 /* Reset all TX qdiscs greater then index of a device. */
410 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
411 {
412 struct Qdisc *qdisc;
413
414 for (; i < dev->num_tx_queues; i++) {
415 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
416 if (qdisc) {
417 spin_lock_bh(qdisc_lock(qdisc));
418 qdisc_reset(qdisc);
419 spin_unlock_bh(qdisc_lock(qdisc));
420 }
421 }
422 }
423
424 static inline void qdisc_reset_all_tx(struct net_device *dev)
425 {
426 qdisc_reset_all_tx_gt(dev, 0);
427 }
428
429 /* Are all TX queues of the device empty? */
430 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
431 {
432 unsigned int i;
433
434 rcu_read_lock();
435 for (i = 0; i < dev->num_tx_queues; i++) {
436 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
437 const struct Qdisc *q = rcu_dereference(txq->qdisc);
438
439 if (q->q.qlen) {
440 rcu_read_unlock();
441 return false;
442 }
443 }
444 rcu_read_unlock();
445 return true;
446 }
447
448 /* Are any of the TX qdiscs changing? */
449 static inline bool qdisc_tx_changing(const struct net_device *dev)
450 {
451 unsigned int i;
452
453 for (i = 0; i < dev->num_tx_queues; i++) {
454 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
455 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
456 return true;
457 }
458 return false;
459 }
460
461 /* Is the device using the noop qdisc on all queues? */
462 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
463 {
464 unsigned int i;
465
466 for (i = 0; i < dev->num_tx_queues; i++) {
467 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
468 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
469 return false;
470 }
471 return true;
472 }
473
474 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
475 {
476 return qdisc_skb_cb(skb)->pkt_len;
477 }
478
479 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
480 enum net_xmit_qdisc_t {
481 __NET_XMIT_STOLEN = 0x00010000,
482 __NET_XMIT_BYPASS = 0x00020000,
483 };
484
485 #ifdef CONFIG_NET_CLS_ACT
486 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
487 #else
488 #define net_xmit_drop_count(e) (1)
489 #endif
490
491 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
492 const struct Qdisc *sch)
493 {
494 #ifdef CONFIG_NET_SCHED
495 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
496
497 if (stab)
498 __qdisc_calculate_pkt_len(skb, stab);
499 #endif
500 }
501
502 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
503 {
504 qdisc_calculate_pkt_len(skb, sch);
505 return sch->enqueue(skb, sch);
506 }
507
508 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
509 {
510 qdisc_skb_cb(skb)->pkt_len = skb->len;
511 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
512 }
513
514 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
515 {
516 return q->flags & TCQ_F_CPUSTATS;
517 }
518
519 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
520 const struct sk_buff *skb)
521 {
522 bstats->bytes += qdisc_pkt_len(skb);
523 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
524 }
525
526 static inline void qdisc_bstats_update_cpu(struct Qdisc *sch,
527 const struct sk_buff *skb)
528 {
529 struct gnet_stats_basic_cpu *bstats =
530 this_cpu_ptr(sch->cpu_bstats);
531
532 u64_stats_update_begin(&bstats->syncp);
533 bstats_update(&bstats->bstats, skb);
534 u64_stats_update_end(&bstats->syncp);
535 }
536
537 static inline void qdisc_bstats_update(struct Qdisc *sch,
538 const struct sk_buff *skb)
539 {
540 bstats_update(&sch->bstats, skb);
541 }
542
543 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
544 const struct sk_buff *skb)
545 {
546 sch->qstats.backlog -= qdisc_pkt_len(skb);
547 }
548
549 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
550 const struct sk_buff *skb)
551 {
552 sch->qstats.backlog += qdisc_pkt_len(skb);
553 }
554
555 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
556 {
557 sch->qstats.drops += count;
558 }
559
560 static inline void qdisc_qstats_drop(struct Qdisc *sch)
561 {
562 sch->qstats.drops++;
563 }
564
565 static inline void qdisc_qstats_drop_cpu(struct Qdisc *sch)
566 {
567 struct gnet_stats_queue *qstats = this_cpu_ptr(sch->cpu_qstats);
568
569 qstats->drops++;
570 }
571
572 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
573 {
574 sch->qstats.overlimits++;
575 }
576
577 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
578 struct sk_buff_head *list)
579 {
580 __skb_queue_tail(list, skb);
581 qdisc_qstats_backlog_inc(sch, skb);
582
583 return NET_XMIT_SUCCESS;
584 }
585
586 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
587 {
588 return __qdisc_enqueue_tail(skb, sch, &sch->q);
589 }
590
591 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
592 struct sk_buff_head *list)
593 {
594 struct sk_buff *skb = __skb_dequeue(list);
595
596 if (likely(skb != NULL)) {
597 qdisc_qstats_backlog_dec(sch, skb);
598 qdisc_bstats_update(sch, skb);
599 }
600
601 return skb;
602 }
603
604 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
605 {
606 return __qdisc_dequeue_head(sch, &sch->q);
607 }
608
609 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
610 struct sk_buff_head *list)
611 {
612 struct sk_buff *skb = __skb_dequeue(list);
613
614 if (likely(skb != NULL)) {
615 unsigned int len = qdisc_pkt_len(skb);
616 qdisc_qstats_backlog_dec(sch, skb);
617 kfree_skb(skb);
618 return len;
619 }
620
621 return 0;
622 }
623
624 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
625 {
626 return __qdisc_queue_drop_head(sch, &sch->q);
627 }
628
629 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
630 struct sk_buff_head *list)
631 {
632 struct sk_buff *skb = __skb_dequeue_tail(list);
633
634 if (likely(skb != NULL))
635 qdisc_qstats_backlog_dec(sch, skb);
636
637 return skb;
638 }
639
640 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
641 {
642 return __qdisc_dequeue_tail(sch, &sch->q);
643 }
644
645 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
646 {
647 return skb_peek(&sch->q);
648 }
649
650 /* generic pseudo peek method for non-work-conserving qdisc */
651 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
652 {
653 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
654 if (!sch->gso_skb) {
655 sch->gso_skb = sch->dequeue(sch);
656 if (sch->gso_skb)
657 /* it's still part of the queue */
658 sch->q.qlen++;
659 }
660
661 return sch->gso_skb;
662 }
663
664 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
665 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
666 {
667 struct sk_buff *skb = sch->gso_skb;
668
669 if (skb) {
670 sch->gso_skb = NULL;
671 sch->q.qlen--;
672 } else {
673 skb = sch->dequeue(sch);
674 }
675
676 return skb;
677 }
678
679 static inline void __qdisc_reset_queue(struct Qdisc *sch,
680 struct sk_buff_head *list)
681 {
682 /*
683 * We do not know the backlog in bytes of this list, it
684 * is up to the caller to correct it
685 */
686 __skb_queue_purge(list);
687 }
688
689 static inline void qdisc_reset_queue(struct Qdisc *sch)
690 {
691 __qdisc_reset_queue(sch, &sch->q);
692 sch->qstats.backlog = 0;
693 }
694
695 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
696 struct sk_buff_head *list)
697 {
698 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
699
700 if (likely(skb != NULL)) {
701 unsigned int len = qdisc_pkt_len(skb);
702 kfree_skb(skb);
703 return len;
704 }
705
706 return 0;
707 }
708
709 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
710 {
711 return __qdisc_queue_drop(sch, &sch->q);
712 }
713
714 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
715 {
716 kfree_skb(skb);
717 qdisc_qstats_drop(sch);
718
719 return NET_XMIT_DROP;
720 }
721
722 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
723 {
724 qdisc_qstats_drop(sch);
725
726 #ifdef CONFIG_NET_CLS_ACT
727 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
728 goto drop;
729
730 return NET_XMIT_SUCCESS;
731
732 drop:
733 #endif
734 kfree_skb(skb);
735 return NET_XMIT_DROP;
736 }
737
738 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
739 long it will take to send a packet given its size.
740 */
741 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
742 {
743 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
744 if (slot < 0)
745 slot = 0;
746 slot >>= rtab->rate.cell_log;
747 if (slot > 255)
748 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
749 return rtab->data[slot];
750 }
751
752 #ifdef CONFIG_NET_CLS_ACT
753 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
754 int action)
755 {
756 struct sk_buff *n;
757
758 n = skb_clone(skb, gfp_mask);
759
760 if (n) {
761 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
762 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
763 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
764 }
765 return n;
766 }
767 #endif
768
769 struct psched_ratecfg {
770 u64 rate_bytes_ps; /* bytes per second */
771 u32 mult;
772 u16 overhead;
773 u8 linklayer;
774 u8 shift;
775 };
776
777 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
778 unsigned int len)
779 {
780 len += r->overhead;
781
782 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
783 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
784
785 return ((u64)len * r->mult) >> r->shift;
786 }
787
788 void psched_ratecfg_precompute(struct psched_ratecfg *r,
789 const struct tc_ratespec *conf,
790 u64 rate64);
791
792 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
793 const struct psched_ratecfg *r)
794 {
795 memset(res, 0, sizeof(*res));
796
797 /* legacy struct tc_ratespec has a 32bit @rate field
798 * Qdisc using 64bit rate should add new attributes
799 * in order to maintain compatibility.
800 */
801 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
802
803 res->overhead = r->overhead;
804 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
805 }
806
807 #endif
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