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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[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 _pad;
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 const struct Qdisc_ops *default_qdisc_ops;
344
345 struct Qdisc_class_common {
346 u32 classid;
347 struct hlist_node hnode;
348 };
349
350 struct Qdisc_class_hash {
351 struct hlist_head *hash;
352 unsigned int hashsize;
353 unsigned int hashmask;
354 unsigned int hashelems;
355 };
356
357 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
358 {
359 id ^= id >> 8;
360 id ^= id >> 4;
361 return id & mask;
362 }
363
364 static inline struct Qdisc_class_common *
365 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
366 {
367 struct Qdisc_class_common *cl;
368 unsigned int h;
369
370 h = qdisc_class_hash(id, hash->hashmask);
371 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
372 if (cl->classid == id)
373 return cl;
374 }
375 return NULL;
376 }
377
378 int qdisc_class_hash_init(struct Qdisc_class_hash *);
379 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
380 struct Qdisc_class_common *);
381 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
382 struct Qdisc_class_common *);
383 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
384 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
385
386 void dev_init_scheduler(struct net_device *dev);
387 void dev_shutdown(struct net_device *dev);
388 void dev_activate(struct net_device *dev);
389 void dev_deactivate(struct net_device *dev);
390 void dev_deactivate_many(struct list_head *head);
391 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
392 struct Qdisc *qdisc);
393 void qdisc_reset(struct Qdisc *qdisc);
394 void qdisc_destroy(struct Qdisc *qdisc);
395 void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
396 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
397 const struct Qdisc_ops *ops);
398 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
399 const struct Qdisc_ops *ops, u32 parentid);
400 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
401 const struct qdisc_size_table *stab);
402 bool tcf_destroy(struct tcf_proto *tp, bool force);
403 void tcf_destroy_chain(struct tcf_proto __rcu **fl);
404
405 /* Reset all TX qdiscs greater then index of a device. */
406 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
407 {
408 struct Qdisc *qdisc;
409
410 for (; i < dev->num_tx_queues; i++) {
411 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
412 if (qdisc) {
413 spin_lock_bh(qdisc_lock(qdisc));
414 qdisc_reset(qdisc);
415 spin_unlock_bh(qdisc_lock(qdisc));
416 }
417 }
418 }
419
420 static inline void qdisc_reset_all_tx(struct net_device *dev)
421 {
422 qdisc_reset_all_tx_gt(dev, 0);
423 }
424
425 /* Are all TX queues of the device empty? */
426 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
427 {
428 unsigned int i;
429
430 rcu_read_lock();
431 for (i = 0; i < dev->num_tx_queues; i++) {
432 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
433 const struct Qdisc *q = rcu_dereference(txq->qdisc);
434
435 if (q->q.qlen) {
436 rcu_read_unlock();
437 return false;
438 }
439 }
440 rcu_read_unlock();
441 return true;
442 }
443
444 /* Are any of the TX qdiscs changing? */
445 static inline bool qdisc_tx_changing(const struct net_device *dev)
446 {
447 unsigned int i;
448
449 for (i = 0; i < dev->num_tx_queues; i++) {
450 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
451 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
452 return true;
453 }
454 return false;
455 }
456
457 /* Is the device using the noop qdisc on all queues? */
458 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
459 {
460 unsigned int i;
461
462 for (i = 0; i < dev->num_tx_queues; i++) {
463 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
464 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
465 return false;
466 }
467 return true;
468 }
469
470 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
471 {
472 return qdisc_skb_cb(skb)->pkt_len;
473 }
474
475 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
476 enum net_xmit_qdisc_t {
477 __NET_XMIT_STOLEN = 0x00010000,
478 __NET_XMIT_BYPASS = 0x00020000,
479 };
480
481 #ifdef CONFIG_NET_CLS_ACT
482 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
483 #else
484 #define net_xmit_drop_count(e) (1)
485 #endif
486
487 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
488 const struct Qdisc *sch)
489 {
490 #ifdef CONFIG_NET_SCHED
491 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
492
493 if (stab)
494 __qdisc_calculate_pkt_len(skb, stab);
495 #endif
496 }
497
498 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
499 {
500 qdisc_calculate_pkt_len(skb, sch);
501 return sch->enqueue(skb, sch);
502 }
503
504 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
505 {
506 return q->flags & TCQ_F_CPUSTATS;
507 }
508
509 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
510 const struct sk_buff *skb)
511 {
512 bstats->bytes += qdisc_pkt_len(skb);
513 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
514 }
515
516 static inline void qdisc_bstats_update_cpu(struct Qdisc *sch,
517 const struct sk_buff *skb)
518 {
519 struct gnet_stats_basic_cpu *bstats =
520 this_cpu_ptr(sch->cpu_bstats);
521
522 u64_stats_update_begin(&bstats->syncp);
523 bstats_update(&bstats->bstats, skb);
524 u64_stats_update_end(&bstats->syncp);
525 }
526
527 static inline void qdisc_bstats_update(struct Qdisc *sch,
528 const struct sk_buff *skb)
529 {
530 bstats_update(&sch->bstats, skb);
531 }
532
533 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
534 const struct sk_buff *skb)
535 {
536 sch->qstats.backlog -= qdisc_pkt_len(skb);
537 }
538
539 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
540 const struct sk_buff *skb)
541 {
542 sch->qstats.backlog += qdisc_pkt_len(skb);
543 }
544
545 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
546 {
547 sch->qstats.drops += count;
548 }
549
550 static inline void qdisc_qstats_drop(struct Qdisc *sch)
551 {
552 sch->qstats.drops++;
553 }
554
555 static inline void qdisc_qstats_drop_cpu(struct Qdisc *sch)
556 {
557 struct gnet_stats_queue *qstats = this_cpu_ptr(sch->cpu_qstats);
558
559 qstats->drops++;
560 }
561
562 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
563 {
564 sch->qstats.overlimits++;
565 }
566
567 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
568 struct sk_buff_head *list)
569 {
570 __skb_queue_tail(list, skb);
571 qdisc_qstats_backlog_inc(sch, skb);
572
573 return NET_XMIT_SUCCESS;
574 }
575
576 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
577 {
578 return __qdisc_enqueue_tail(skb, sch, &sch->q);
579 }
580
581 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
582 struct sk_buff_head *list)
583 {
584 struct sk_buff *skb = __skb_dequeue(list);
585
586 if (likely(skb != NULL)) {
587 qdisc_qstats_backlog_dec(sch, skb);
588 qdisc_bstats_update(sch, skb);
589 }
590
591 return skb;
592 }
593
594 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
595 {
596 return __qdisc_dequeue_head(sch, &sch->q);
597 }
598
599 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
600 struct sk_buff_head *list)
601 {
602 struct sk_buff *skb = __skb_dequeue(list);
603
604 if (likely(skb != NULL)) {
605 unsigned int len = qdisc_pkt_len(skb);
606 qdisc_qstats_backlog_dec(sch, skb);
607 kfree_skb(skb);
608 return len;
609 }
610
611 return 0;
612 }
613
614 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
615 {
616 return __qdisc_queue_drop_head(sch, &sch->q);
617 }
618
619 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
620 struct sk_buff_head *list)
621 {
622 struct sk_buff *skb = __skb_dequeue_tail(list);
623
624 if (likely(skb != NULL))
625 qdisc_qstats_backlog_dec(sch, skb);
626
627 return skb;
628 }
629
630 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
631 {
632 return __qdisc_dequeue_tail(sch, &sch->q);
633 }
634
635 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
636 {
637 return skb_peek(&sch->q);
638 }
639
640 /* generic pseudo peek method for non-work-conserving qdisc */
641 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
642 {
643 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
644 if (!sch->gso_skb) {
645 sch->gso_skb = sch->dequeue(sch);
646 if (sch->gso_skb)
647 /* it's still part of the queue */
648 sch->q.qlen++;
649 }
650
651 return sch->gso_skb;
652 }
653
654 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
655 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
656 {
657 struct sk_buff *skb = sch->gso_skb;
658
659 if (skb) {
660 sch->gso_skb = NULL;
661 sch->q.qlen--;
662 } else {
663 skb = sch->dequeue(sch);
664 }
665
666 return skb;
667 }
668
669 static inline void __qdisc_reset_queue(struct Qdisc *sch,
670 struct sk_buff_head *list)
671 {
672 /*
673 * We do not know the backlog in bytes of this list, it
674 * is up to the caller to correct it
675 */
676 __skb_queue_purge(list);
677 }
678
679 static inline void qdisc_reset_queue(struct Qdisc *sch)
680 {
681 __qdisc_reset_queue(sch, &sch->q);
682 sch->qstats.backlog = 0;
683 }
684
685 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
686 struct sk_buff_head *list)
687 {
688 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
689
690 if (likely(skb != NULL)) {
691 unsigned int len = qdisc_pkt_len(skb);
692 kfree_skb(skb);
693 return len;
694 }
695
696 return 0;
697 }
698
699 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
700 {
701 return __qdisc_queue_drop(sch, &sch->q);
702 }
703
704 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
705 {
706 kfree_skb(skb);
707 qdisc_qstats_drop(sch);
708
709 return NET_XMIT_DROP;
710 }
711
712 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
713 {
714 qdisc_qstats_drop(sch);
715
716 #ifdef CONFIG_NET_CLS_ACT
717 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
718 goto drop;
719
720 return NET_XMIT_SUCCESS;
721
722 drop:
723 #endif
724 kfree_skb(skb);
725 return NET_XMIT_DROP;
726 }
727
728 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
729 long it will take to send a packet given its size.
730 */
731 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
732 {
733 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
734 if (slot < 0)
735 slot = 0;
736 slot >>= rtab->rate.cell_log;
737 if (slot > 255)
738 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
739 return rtab->data[slot];
740 }
741
742 struct psched_ratecfg {
743 u64 rate_bytes_ps; /* bytes per second */
744 u32 mult;
745 u16 overhead;
746 u8 linklayer;
747 u8 shift;
748 };
749
750 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
751 unsigned int len)
752 {
753 len += r->overhead;
754
755 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
756 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
757
758 return ((u64)len * r->mult) >> r->shift;
759 }
760
761 void psched_ratecfg_precompute(struct psched_ratecfg *r,
762 const struct tc_ratespec *conf,
763 u64 rate64);
764
765 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
766 const struct psched_ratecfg *r)
767 {
768 memset(res, 0, sizeof(*res));
769
770 /* legacy struct tc_ratespec has a 32bit @rate field
771 * Qdisc using 64bit rate should add new attributes
772 * in order to maintain compatibility.
773 */
774 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
775
776 res->overhead = r->overhead;
777 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
778 }
779
780 #endif
Linux kernel - Deliverables
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