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Merge tag 'v4.4-rc1' into HEAD
[deliverable/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 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 gnet_stats_basic_cpu __percpu *cpu_bstats;
83 struct gnet_stats_queue __percpu *cpu_qstats;
84
85 struct Qdisc *next_sched;
86 struct sk_buff *gso_skb;
87 /*
88 * For performance sake on SMP, we put highly modified fields at the end
89 */
90 unsigned long state;
91 struct sk_buff_head q;
92 struct gnet_stats_basic_packed bstats;
93 unsigned int __state;
94 struct gnet_stats_queue qstats;
95 struct rcu_head rcu_head;
96 int padded;
97 atomic_t refcnt;
98
99 spinlock_t busylock ____cacheline_aligned_in_smp;
100 };
101
102 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
103 {
104 return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
105 }
106
107 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
108 {
109 if (qdisc_is_running(qdisc))
110 return false;
111 qdisc->__state |= __QDISC___STATE_RUNNING;
112 return true;
113 }
114
115 static inline void qdisc_run_end(struct Qdisc *qdisc)
116 {
117 qdisc->__state &= ~__QDISC___STATE_RUNNING;
118 }
119
120 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
121 {
122 return qdisc->flags & TCQ_F_ONETXQUEUE;
123 }
124
125 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
126 {
127 #ifdef CONFIG_BQL
128 /* Non-BQL migrated drivers will return 0, too. */
129 return dql_avail(&txq->dql);
130 #else
131 return 0;
132 #endif
133 }
134
135 static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
136 {
137 return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
138 }
139
140 static inline void qdisc_throttled(struct Qdisc *qdisc)
141 {
142 set_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
143 }
144
145 static inline void qdisc_unthrottled(struct Qdisc *qdisc)
146 {
147 clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
148 }
149
150 struct Qdisc_class_ops {
151 /* Child qdisc manipulation */
152 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
153 int (*graft)(struct Qdisc *, unsigned long cl,
154 struct Qdisc *, struct Qdisc **);
155 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
156 void (*qlen_notify)(struct Qdisc *, unsigned long);
157
158 /* Class manipulation routines */
159 unsigned long (*get)(struct Qdisc *, u32 classid);
160 void (*put)(struct Qdisc *, unsigned long);
161 int (*change)(struct Qdisc *, u32, u32,
162 struct nlattr **, unsigned long *);
163 int (*delete)(struct Qdisc *, unsigned long);
164 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
165
166 /* Filter manipulation */
167 struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long);
168 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
169 u32 classid);
170 void (*unbind_tcf)(struct Qdisc *, unsigned long);
171
172 /* rtnetlink specific */
173 int (*dump)(struct Qdisc *, unsigned long,
174 struct sk_buff *skb, struct tcmsg*);
175 int (*dump_stats)(struct Qdisc *, unsigned long,
176 struct gnet_dump *);
177 };
178
179 struct Qdisc_ops {
180 struct Qdisc_ops *next;
181 const struct Qdisc_class_ops *cl_ops;
182 char id[IFNAMSIZ];
183 int priv_size;
184
185 int (*enqueue)(struct sk_buff *, struct Qdisc *);
186 struct sk_buff * (*dequeue)(struct Qdisc *);
187 struct sk_buff * (*peek)(struct Qdisc *);
188 unsigned int (*drop)(struct Qdisc *);
189
190 int (*init)(struct Qdisc *, struct nlattr *arg);
191 void (*reset)(struct Qdisc *);
192 void (*destroy)(struct Qdisc *);
193 int (*change)(struct Qdisc *, struct nlattr *arg);
194 void (*attach)(struct Qdisc *);
195
196 int (*dump)(struct Qdisc *, struct sk_buff *);
197 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
198
199 struct module *owner;
200 };
201
202
203 struct tcf_result {
204 unsigned long class;
205 u32 classid;
206 };
207
208 struct tcf_proto_ops {
209 struct list_head head;
210 char kind[IFNAMSIZ];
211
212 int (*classify)(struct sk_buff *,
213 const struct tcf_proto *,
214 struct tcf_result *);
215 int (*init)(struct tcf_proto*);
216 bool (*destroy)(struct tcf_proto*, bool);
217
218 unsigned long (*get)(struct tcf_proto*, u32 handle);
219 int (*change)(struct net *net, struct sk_buff *,
220 struct tcf_proto*, unsigned long,
221 u32 handle, struct nlattr **,
222 unsigned long *, bool);
223 int (*delete)(struct tcf_proto*, unsigned long);
224 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
225
226 /* rtnetlink specific */
227 int (*dump)(struct net*, struct tcf_proto*, unsigned long,
228 struct sk_buff *skb, struct tcmsg*);
229
230 struct module *owner;
231 };
232
233 struct tcf_proto {
234 /* Fast access part */
235 struct tcf_proto __rcu *next;
236 void __rcu *root;
237 int (*classify)(struct sk_buff *,
238 const struct tcf_proto *,
239 struct tcf_result *);
240 __be16 protocol;
241
242 /* All the rest */
243 u32 prio;
244 u32 classid;
245 struct Qdisc *q;
246 void *data;
247 const struct tcf_proto_ops *ops;
248 struct rcu_head rcu;
249 };
250
251 struct qdisc_skb_cb {
252 unsigned int pkt_len;
253 u16 slave_dev_queue_mapping;
254 u16 tc_classid;
255 #define QDISC_CB_PRIV_LEN 20
256 unsigned char data[QDISC_CB_PRIV_LEN];
257 };
258
259 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
260 {
261 struct qdisc_skb_cb *qcb;
262
263 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
264 BUILD_BUG_ON(sizeof(qcb->data) < sz);
265 }
266
267 static inline int qdisc_qlen(const struct Qdisc *q)
268 {
269 return q->q.qlen;
270 }
271
272 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
273 {
274 return (struct qdisc_skb_cb *)skb->cb;
275 }
276
277 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
278 {
279 return &qdisc->q.lock;
280 }
281
282 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
283 {
284 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
285
286 return q;
287 }
288
289 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
290 {
291 return qdisc->dev_queue->qdisc_sleeping;
292 }
293
294 /* The qdisc root lock is a mechanism by which to top level
295 * of a qdisc tree can be locked from any qdisc node in the
296 * forest. This allows changing the configuration of some
297 * aspect of the qdisc tree while blocking out asynchronous
298 * qdisc access in the packet processing paths.
299 *
300 * It is only legal to do this when the root will not change
301 * on us. Otherwise we'll potentially lock the wrong qdisc
302 * root. This is enforced by holding the RTNL semaphore, which
303 * all users of this lock accessor must do.
304 */
305 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
306 {
307 struct Qdisc *root = qdisc_root(qdisc);
308
309 ASSERT_RTNL();
310 return qdisc_lock(root);
311 }
312
313 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
314 {
315 struct Qdisc *root = qdisc_root_sleeping(qdisc);
316
317 ASSERT_RTNL();
318 return qdisc_lock(root);
319 }
320
321 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
322 {
323 return qdisc->dev_queue->dev;
324 }
325
326 static inline void sch_tree_lock(const struct Qdisc *q)
327 {
328 spin_lock_bh(qdisc_root_sleeping_lock(q));
329 }
330
331 static inline void sch_tree_unlock(const struct Qdisc *q)
332 {
333 spin_unlock_bh(qdisc_root_sleeping_lock(q));
334 }
335
336 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
337 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
338
339 extern struct Qdisc noop_qdisc;
340 extern struct Qdisc_ops noop_qdisc_ops;
341 extern struct Qdisc_ops pfifo_fast_ops;
342 extern struct Qdisc_ops mq_qdisc_ops;
343 extern struct Qdisc_ops noqueue_qdisc_ops;
344 extern const struct Qdisc_ops *default_qdisc_ops;
345
346 struct Qdisc_class_common {
347 u32 classid;
348 struct hlist_node hnode;
349 };
350
351 struct Qdisc_class_hash {
352 struct hlist_head *hash;
353 unsigned int hashsize;
354 unsigned int hashmask;
355 unsigned int hashelems;
356 };
357
358 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
359 {
360 id ^= id >> 8;
361 id ^= id >> 4;
362 return id & mask;
363 }
364
365 static inline struct Qdisc_class_common *
366 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
367 {
368 struct Qdisc_class_common *cl;
369 unsigned int h;
370
371 h = qdisc_class_hash(id, hash->hashmask);
372 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
373 if (cl->classid == id)
374 return cl;
375 }
376 return NULL;
377 }
378
379 int qdisc_class_hash_init(struct Qdisc_class_hash *);
380 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
381 struct Qdisc_class_common *);
382 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
383 struct Qdisc_class_common *);
384 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
385 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
386
387 void dev_init_scheduler(struct net_device *dev);
388 void dev_shutdown(struct net_device *dev);
389 void dev_activate(struct net_device *dev);
390 void dev_deactivate(struct net_device *dev);
391 void dev_deactivate_many(struct list_head *head);
392 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
393 struct Qdisc *qdisc);
394 void qdisc_reset(struct Qdisc *qdisc);
395 void qdisc_destroy(struct Qdisc *qdisc);
396 void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
397 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
398 const struct Qdisc_ops *ops);
399 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
400 const struct Qdisc_ops *ops, u32 parentid);
401 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
402 const struct qdisc_size_table *stab);
403 bool tcf_destroy(struct tcf_proto *tp, bool force);
404 void tcf_destroy_chain(struct tcf_proto __rcu **fl);
405 int skb_do_redirect(struct sk_buff *);
406
407 /* Reset all TX qdiscs greater then index of a device. */
408 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
409 {
410 struct Qdisc *qdisc;
411
412 for (; i < dev->num_tx_queues; i++) {
413 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
414 if (qdisc) {
415 spin_lock_bh(qdisc_lock(qdisc));
416 qdisc_reset(qdisc);
417 spin_unlock_bh(qdisc_lock(qdisc));
418 }
419 }
420 }
421
422 static inline void qdisc_reset_all_tx(struct net_device *dev)
423 {
424 qdisc_reset_all_tx_gt(dev, 0);
425 }
426
427 /* Are all TX queues of the device empty? */
428 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
429 {
430 unsigned int i;
431
432 rcu_read_lock();
433 for (i = 0; i < dev->num_tx_queues; i++) {
434 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
435 const struct Qdisc *q = rcu_dereference(txq->qdisc);
436
437 if (q->q.qlen) {
438 rcu_read_unlock();
439 return false;
440 }
441 }
442 rcu_read_unlock();
443 return true;
444 }
445
446 /* Are any of the TX qdiscs changing? */
447 static inline bool qdisc_tx_changing(const struct net_device *dev)
448 {
449 unsigned int i;
450
451 for (i = 0; i < dev->num_tx_queues; i++) {
452 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
453 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
454 return true;
455 }
456 return false;
457 }
458
459 /* Is the device using the noop qdisc on all queues? */
460 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
461 {
462 unsigned int i;
463
464 for (i = 0; i < dev->num_tx_queues; i++) {
465 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
466 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
467 return false;
468 }
469 return true;
470 }
471
472 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
473 {
474 return qdisc_skb_cb(skb)->pkt_len;
475 }
476
477 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
478 enum net_xmit_qdisc_t {
479 __NET_XMIT_STOLEN = 0x00010000,
480 __NET_XMIT_BYPASS = 0x00020000,
481 };
482
483 #ifdef CONFIG_NET_CLS_ACT
484 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
485 #else
486 #define net_xmit_drop_count(e) (1)
487 #endif
488
489 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
490 const struct Qdisc *sch)
491 {
492 #ifdef CONFIG_NET_SCHED
493 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
494
495 if (stab)
496 __qdisc_calculate_pkt_len(skb, stab);
497 #endif
498 }
499
500 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
501 {
502 qdisc_calculate_pkt_len(skb, sch);
503 return sch->enqueue(skb, sch);
504 }
505
506 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
507 {
508 return q->flags & TCQ_F_CPUSTATS;
509 }
510
511 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
512 const struct sk_buff *skb)
513 {
514 bstats->bytes += qdisc_pkt_len(skb);
515 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
516 }
517
518 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
519 const struct sk_buff *skb)
520 {
521 u64_stats_update_begin(&bstats->syncp);
522 bstats_update(&bstats->bstats, skb);
523 u64_stats_update_end(&bstats->syncp);
524 }
525
526 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
527 const struct sk_buff *skb)
528 {
529 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
530 }
531
532 static inline void qdisc_bstats_update(struct Qdisc *sch,
533 const struct sk_buff *skb)
534 {
535 bstats_update(&sch->bstats, skb);
536 }
537
538 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
539 const struct sk_buff *skb)
540 {
541 sch->qstats.backlog -= qdisc_pkt_len(skb);
542 }
543
544 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
545 const struct sk_buff *skb)
546 {
547 sch->qstats.backlog += qdisc_pkt_len(skb);
548 }
549
550 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
551 {
552 sch->qstats.drops += count;
553 }
554
555 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
556 {
557 qstats->drops++;
558 }
559
560 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
561 {
562 qstats->overlimits++;
563 }
564
565 static inline void qdisc_qstats_drop(struct Qdisc *sch)
566 {
567 qstats_drop_inc(&sch->qstats);
568 }
569
570 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
571 {
572 qstats_drop_inc(this_cpu_ptr(sch->cpu_qstats));
573 }
574
575 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
576 {
577 sch->qstats.overlimits++;
578 }
579
580 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
581 struct sk_buff_head *list)
582 {
583 __skb_queue_tail(list, skb);
584 qdisc_qstats_backlog_inc(sch, skb);
585
586 return NET_XMIT_SUCCESS;
587 }
588
589 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
590 {
591 return __qdisc_enqueue_tail(skb, sch, &sch->q);
592 }
593
594 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
595 struct sk_buff_head *list)
596 {
597 struct sk_buff *skb = __skb_dequeue(list);
598
599 if (likely(skb != NULL)) {
600 qdisc_qstats_backlog_dec(sch, skb);
601 qdisc_bstats_update(sch, skb);
602 }
603
604 return skb;
605 }
606
607 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
608 {
609 return __qdisc_dequeue_head(sch, &sch->q);
610 }
611
612 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
613 struct sk_buff_head *list)
614 {
615 struct sk_buff *skb = __skb_dequeue(list);
616
617 if (likely(skb != NULL)) {
618 unsigned int len = qdisc_pkt_len(skb);
619 qdisc_qstats_backlog_dec(sch, skb);
620 kfree_skb(skb);
621 return len;
622 }
623
624 return 0;
625 }
626
627 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
628 {
629 return __qdisc_queue_drop_head(sch, &sch->q);
630 }
631
632 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
633 struct sk_buff_head *list)
634 {
635 struct sk_buff *skb = __skb_dequeue_tail(list);
636
637 if (likely(skb != NULL))
638 qdisc_qstats_backlog_dec(sch, skb);
639
640 return skb;
641 }
642
643 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
644 {
645 return __qdisc_dequeue_tail(sch, &sch->q);
646 }
647
648 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
649 {
650 return skb_peek(&sch->q);
651 }
652
653 /* generic pseudo peek method for non-work-conserving qdisc */
654 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
655 {
656 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
657 if (!sch->gso_skb) {
658 sch->gso_skb = sch->dequeue(sch);
659 if (sch->gso_skb)
660 /* it's still part of the queue */
661 sch->q.qlen++;
662 }
663
664 return sch->gso_skb;
665 }
666
667 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
668 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
669 {
670 struct sk_buff *skb = sch->gso_skb;
671
672 if (skb) {
673 sch->gso_skb = NULL;
674 sch->q.qlen--;
675 } else {
676 skb = sch->dequeue(sch);
677 }
678
679 return skb;
680 }
681
682 static inline void __qdisc_reset_queue(struct Qdisc *sch,
683 struct sk_buff_head *list)
684 {
685 /*
686 * We do not know the backlog in bytes of this list, it
687 * is up to the caller to correct it
688 */
689 __skb_queue_purge(list);
690 }
691
692 static inline void qdisc_reset_queue(struct Qdisc *sch)
693 {
694 __qdisc_reset_queue(sch, &sch->q);
695 sch->qstats.backlog = 0;
696 }
697
698 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
699 struct sk_buff_head *list)
700 {
701 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
702
703 if (likely(skb != NULL)) {
704 unsigned int len = qdisc_pkt_len(skb);
705 kfree_skb(skb);
706 return len;
707 }
708
709 return 0;
710 }
711
712 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
713 {
714 return __qdisc_queue_drop(sch, &sch->q);
715 }
716
717 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
718 {
719 kfree_skb(skb);
720 qdisc_qstats_drop(sch);
721
722 return NET_XMIT_DROP;
723 }
724
725 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
726 {
727 qdisc_qstats_drop(sch);
728
729 #ifdef CONFIG_NET_CLS_ACT
730 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
731 goto drop;
732
733 return NET_XMIT_SUCCESS;
734
735 drop:
736 #endif
737 kfree_skb(skb);
738 return NET_XMIT_DROP;
739 }
740
741 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
742 long it will take to send a packet given its size.
743 */
744 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
745 {
746 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
747 if (slot < 0)
748 slot = 0;
749 slot >>= rtab->rate.cell_log;
750 if (slot > 255)
751 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
752 return rtab->data[slot];
753 }
754
755 struct psched_ratecfg {
756 u64 rate_bytes_ps; /* bytes per second */
757 u32 mult;
758 u16 overhead;
759 u8 linklayer;
760 u8 shift;
761 };
762
763 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
764 unsigned int len)
765 {
766 len += r->overhead;
767
768 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
769 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
770
771 return ((u64)len * r->mult) >> r->shift;
772 }
773
774 void psched_ratecfg_precompute(struct psched_ratecfg *r,
775 const struct tc_ratespec *conf,
776 u64 rate64);
777
778 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
779 const struct psched_ratecfg *r)
780 {
781 memset(res, 0, sizeof(*res));
782
783 /* legacy struct tc_ratespec has a 32bit @rate field
784 * Qdisc using 64bit rate should add new attributes
785 * in order to maintain compatibility.
786 */
787 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
788
789 res->overhead = r->overhead;
790 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
791 }
792
793 #endif
Linux kernel - Deliverables
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