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net/mlx4_core: Port aggregation upper layer interface
[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 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 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 _pad;
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 const struct Qdisc_ops *default_qdisc_ops;
347
348 struct Qdisc_class_common {
349 u32 classid;
350 struct hlist_node hnode;
351 };
352
353 struct Qdisc_class_hash {
354 struct hlist_head *hash;
355 unsigned int hashsize;
356 unsigned int hashmask;
357 unsigned int hashelems;
358 };
359
360 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
361 {
362 id ^= id >> 8;
363 id ^= id >> 4;
364 return id & mask;
365 }
366
367 static inline struct Qdisc_class_common *
368 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
369 {
370 struct Qdisc_class_common *cl;
371 unsigned int h;
372
373 h = qdisc_class_hash(id, hash->hashmask);
374 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
375 if (cl->classid == id)
376 return cl;
377 }
378 return NULL;
379 }
380
381 int qdisc_class_hash_init(struct Qdisc_class_hash *);
382 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
383 struct Qdisc_class_common *);
384 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
385 struct Qdisc_class_common *);
386 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
387 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
388
389 void dev_init_scheduler(struct net_device *dev);
390 void dev_shutdown(struct net_device *dev);
391 void dev_activate(struct net_device *dev);
392 void dev_deactivate(struct net_device *dev);
393 void dev_deactivate_many(struct list_head *head);
394 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
395 struct Qdisc *qdisc);
396 void qdisc_reset(struct Qdisc *qdisc);
397 void qdisc_destroy(struct Qdisc *qdisc);
398 void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
399 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
400 const struct Qdisc_ops *ops);
401 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
402 const struct Qdisc_ops *ops, u32 parentid);
403 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
404 const struct qdisc_size_table *stab);
405 void tcf_destroy(struct tcf_proto *tp);
406 void tcf_destroy_chain(struct tcf_proto __rcu **fl);
407
408 /* Reset all TX qdiscs greater then index of a device. */
409 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
410 {
411 struct Qdisc *qdisc;
412
413 for (; i < dev->num_tx_queues; i++) {
414 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
415 if (qdisc) {
416 spin_lock_bh(qdisc_lock(qdisc));
417 qdisc_reset(qdisc);
418 spin_unlock_bh(qdisc_lock(qdisc));
419 }
420 }
421 }
422
423 static inline void qdisc_reset_all_tx(struct net_device *dev)
424 {
425 qdisc_reset_all_tx_gt(dev, 0);
426 }
427
428 /* Are all TX queues of the device empty? */
429 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
430 {
431 unsigned int i;
432
433 rcu_read_lock();
434 for (i = 0; i < dev->num_tx_queues; i++) {
435 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
436 const struct Qdisc *q = rcu_dereference(txq->qdisc);
437
438 if (q->q.qlen) {
439 rcu_read_unlock();
440 return false;
441 }
442 }
443 rcu_read_unlock();
444 return true;
445 }
446
447 /* Are any of the TX qdiscs changing? */
448 static inline bool qdisc_tx_changing(const struct net_device *dev)
449 {
450 unsigned int i;
451
452 for (i = 0; i < dev->num_tx_queues; i++) {
453 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
454 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
455 return true;
456 }
457 return false;
458 }
459
460 /* Is the device using the noop qdisc on all queues? */
461 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
462 {
463 unsigned int i;
464
465 for (i = 0; i < dev->num_tx_queues; i++) {
466 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
467 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
468 return false;
469 }
470 return true;
471 }
472
473 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
474 {
475 return qdisc_skb_cb(skb)->pkt_len;
476 }
477
478 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
479 enum net_xmit_qdisc_t {
480 __NET_XMIT_STOLEN = 0x00010000,
481 __NET_XMIT_BYPASS = 0x00020000,
482 };
483
484 #ifdef CONFIG_NET_CLS_ACT
485 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
486 #else
487 #define net_xmit_drop_count(e) (1)
488 #endif
489
490 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
491 const struct Qdisc *sch)
492 {
493 #ifdef CONFIG_NET_SCHED
494 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
495
496 if (stab)
497 __qdisc_calculate_pkt_len(skb, stab);
498 #endif
499 }
500
501 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
502 {
503 qdisc_calculate_pkt_len(skb, sch);
504 return sch->enqueue(skb, sch);
505 }
506
507 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
508 {
509 qdisc_skb_cb(skb)->pkt_len = skb->len;
510 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
511 }
512
513 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
514 {
515 return q->flags & TCQ_F_CPUSTATS;
516 }
517
518 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
519 const struct sk_buff *skb)
520 {
521 bstats->bytes += qdisc_pkt_len(skb);
522 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
523 }
524
525 static inline void qdisc_bstats_update_cpu(struct Qdisc *sch,
526 const struct sk_buff *skb)
527 {
528 struct gnet_stats_basic_cpu *bstats =
529 this_cpu_ptr(sch->cpu_bstats);
530
531 u64_stats_update_begin(&bstats->syncp);
532 bstats_update(&bstats->bstats, skb);
533 u64_stats_update_end(&bstats->syncp);
534 }
535
536 static inline void qdisc_bstats_update(struct Qdisc *sch,
537 const struct sk_buff *skb)
538 {
539 bstats_update(&sch->bstats, skb);
540 }
541
542 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
543 const struct sk_buff *skb)
544 {
545 sch->qstats.backlog -= qdisc_pkt_len(skb);
546 }
547
548 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
549 const struct sk_buff *skb)
550 {
551 sch->qstats.backlog += qdisc_pkt_len(skb);
552 }
553
554 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
555 {
556 sch->qstats.drops += count;
557 }
558
559 static inline void qdisc_qstats_drop(struct Qdisc *sch)
560 {
561 sch->qstats.drops++;
562 }
563
564 static inline void qdisc_qstats_drop_cpu(struct Qdisc *sch)
565 {
566 struct gnet_stats_queue *qstats = this_cpu_ptr(sch->cpu_qstats);
567
568 qstats->drops++;
569 }
570
571 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
572 {
573 sch->qstats.overlimits++;
574 }
575
576 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
577 struct sk_buff_head *list)
578 {
579 __skb_queue_tail(list, skb);
580 qdisc_qstats_backlog_inc(sch, skb);
581
582 return NET_XMIT_SUCCESS;
583 }
584
585 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
586 {
587 return __qdisc_enqueue_tail(skb, sch, &sch->q);
588 }
589
590 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
591 struct sk_buff_head *list)
592 {
593 struct sk_buff *skb = __skb_dequeue(list);
594
595 if (likely(skb != NULL)) {
596 qdisc_qstats_backlog_dec(sch, skb);
597 qdisc_bstats_update(sch, skb);
598 }
599
600 return skb;
601 }
602
603 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
604 {
605 return __qdisc_dequeue_head(sch, &sch->q);
606 }
607
608 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
609 struct sk_buff_head *list)
610 {
611 struct sk_buff *skb = __skb_dequeue(list);
612
613 if (likely(skb != NULL)) {
614 unsigned int len = qdisc_pkt_len(skb);
615 qdisc_qstats_backlog_dec(sch, skb);
616 kfree_skb(skb);
617 return len;
618 }
619
620 return 0;
621 }
622
623 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
624 {
625 return __qdisc_queue_drop_head(sch, &sch->q);
626 }
627
628 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
629 struct sk_buff_head *list)
630 {
631 struct sk_buff *skb = __skb_dequeue_tail(list);
632
633 if (likely(skb != NULL))
634 qdisc_qstats_backlog_dec(sch, skb);
635
636 return skb;
637 }
638
639 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
640 {
641 return __qdisc_dequeue_tail(sch, &sch->q);
642 }
643
644 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
645 {
646 return skb_peek(&sch->q);
647 }
648
649 /* generic pseudo peek method for non-work-conserving qdisc */
650 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
651 {
652 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
653 if (!sch->gso_skb) {
654 sch->gso_skb = sch->dequeue(sch);
655 if (sch->gso_skb)
656 /* it's still part of the queue */
657 sch->q.qlen++;
658 }
659
660 return sch->gso_skb;
661 }
662
663 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
664 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
665 {
666 struct sk_buff *skb = sch->gso_skb;
667
668 if (skb) {
669 sch->gso_skb = NULL;
670 sch->q.qlen--;
671 } else {
672 skb = sch->dequeue(sch);
673 }
674
675 return skb;
676 }
677
678 static inline void __qdisc_reset_queue(struct Qdisc *sch,
679 struct sk_buff_head *list)
680 {
681 /*
682 * We do not know the backlog in bytes of this list, it
683 * is up to the caller to correct it
684 */
685 __skb_queue_purge(list);
686 }
687
688 static inline void qdisc_reset_queue(struct Qdisc *sch)
689 {
690 __qdisc_reset_queue(sch, &sch->q);
691 sch->qstats.backlog = 0;
692 }
693
694 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
695 struct sk_buff_head *list)
696 {
697 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
698
699 if (likely(skb != NULL)) {
700 unsigned int len = qdisc_pkt_len(skb);
701 kfree_skb(skb);
702 return len;
703 }
704
705 return 0;
706 }
707
708 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
709 {
710 return __qdisc_queue_drop(sch, &sch->q);
711 }
712
713 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
714 {
715 kfree_skb(skb);
716 qdisc_qstats_drop(sch);
717
718 return NET_XMIT_DROP;
719 }
720
721 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
722 {
723 qdisc_qstats_drop(sch);
724
725 #ifdef CONFIG_NET_CLS_ACT
726 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
727 goto drop;
728
729 return NET_XMIT_SUCCESS;
730
731 drop:
732 #endif
733 kfree_skb(skb);
734 return NET_XMIT_DROP;
735 }
736
737 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
738 long it will take to send a packet given its size.
739 */
740 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
741 {
742 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
743 if (slot < 0)
744 slot = 0;
745 slot >>= rtab->rate.cell_log;
746 if (slot > 255)
747 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
748 return rtab->data[slot];
749 }
750
751 #ifdef CONFIG_NET_CLS_ACT
752 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
753 int action)
754 {
755 struct sk_buff *n;
756
757 n = skb_clone(skb, gfp_mask);
758
759 if (n) {
760 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
761 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
762 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
763 }
764 return n;
765 }
766 #endif
767
768 struct psched_ratecfg {
769 u64 rate_bytes_ps; /* bytes per second */
770 u32 mult;
771 u16 overhead;
772 u8 linklayer;
773 u8 shift;
774 };
775
776 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
777 unsigned int len)
778 {
779 len += r->overhead;
780
781 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
782 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
783
784 return ((u64)len * r->mult) >> r->shift;
785 }
786
787 void psched_ratecfg_precompute(struct psched_ratecfg *r,
788 const struct tc_ratespec *conf,
789 u64 rate64);
790
791 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
792 const struct psched_ratecfg *r)
793 {
794 memset(res, 0, sizeof(*res));
795
796 /* legacy struct tc_ratespec has a 32bit @rate field
797 * Qdisc using 64bit rate should add new attributes
798 * in order to maintain compatibility.
799 */
800 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
801
802 res->overhead = r->overhead;
803 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
804 }
805
806 #endif
Linux kernel - Deliverables
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