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Merge tag 'trace-fixes-v4.5-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / include / net / sch_generic.h
blob636a362a0e03574f0564d2f0a7b7a5fecfc1e3bd
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 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
411 {
412 #ifdef CONFIG_NET_CLS_ACT
413 return G_TC_AT(skb->tc_verd) & AT_INGRESS;
414 #else
415 return false;
416 #endif
417 }
418
419 /* Reset all TX qdiscs greater then index of a device. */
420 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
421 {
422 struct Qdisc *qdisc;
423
424 for (; i < dev->num_tx_queues; i++) {
425 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
426 if (qdisc) {
427 spin_lock_bh(qdisc_lock(qdisc));
428 qdisc_reset(qdisc);
429 spin_unlock_bh(qdisc_lock(qdisc));
430 }
431 }
432 }
433
434 static inline void qdisc_reset_all_tx(struct net_device *dev)
435 {
436 qdisc_reset_all_tx_gt(dev, 0);
437 }
438
439 /* Are all TX queues of the device empty? */
440 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
441 {
442 unsigned int i;
443
444 rcu_read_lock();
445 for (i = 0; i < dev->num_tx_queues; i++) {
446 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
447 const struct Qdisc *q = rcu_dereference(txq->qdisc);
448
449 if (q->q.qlen) {
450 rcu_read_unlock();
451 return false;
452 }
453 }
454 rcu_read_unlock();
455 return true;
456 }
457
458 /* Are any of the TX qdiscs changing? */
459 static inline bool qdisc_tx_changing(const struct net_device *dev)
460 {
461 unsigned int i;
462
463 for (i = 0; i < dev->num_tx_queues; i++) {
464 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
465 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
466 return true;
467 }
468 return false;
469 }
470
471 /* Is the device using the noop qdisc on all queues? */
472 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
473 {
474 unsigned int i;
475
476 for (i = 0; i < dev->num_tx_queues; i++) {
477 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
478 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
479 return false;
480 }
481 return true;
482 }
483
484 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
485 {
486 return qdisc_skb_cb(skb)->pkt_len;
487 }
488
489 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
490 enum net_xmit_qdisc_t {
491 __NET_XMIT_STOLEN = 0x00010000,
492 __NET_XMIT_BYPASS = 0x00020000,
493 };
494
495 #ifdef CONFIG_NET_CLS_ACT
496 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
497 #else
498 #define net_xmit_drop_count(e) (1)
499 #endif
500
501 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
502 const struct Qdisc *sch)
503 {
504 #ifdef CONFIG_NET_SCHED
505 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
506
507 if (stab)
508 __qdisc_calculate_pkt_len(skb, stab);
509 #endif
510 }
511
512 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
513 {
514 qdisc_calculate_pkt_len(skb, sch);
515 return sch->enqueue(skb, sch);
516 }
517
518 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
519 {
520 return q->flags & TCQ_F_CPUSTATS;
521 }
522
523 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
524 const struct sk_buff *skb)
525 {
526 bstats->bytes += qdisc_pkt_len(skb);
527 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
528 }
529
530 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
531 const struct sk_buff *skb)
532 {
533 u64_stats_update_begin(&bstats->syncp);
534 bstats_update(&bstats->bstats, skb);
535 u64_stats_update_end(&bstats->syncp);
536 }
537
538 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
539 const struct sk_buff *skb)
540 {
541 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
542 }
543
544 static inline void qdisc_bstats_update(struct Qdisc *sch,
545 const struct sk_buff *skb)
546 {
547 bstats_update(&sch->bstats, skb);
548 }
549
550 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
551 const struct sk_buff *skb)
552 {
553 sch->qstats.backlog -= qdisc_pkt_len(skb);
554 }
555
556 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
557 const struct sk_buff *skb)
558 {
559 sch->qstats.backlog += qdisc_pkt_len(skb);
560 }
561
562 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
563 {
564 sch->qstats.drops += count;
565 }
566
567 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
568 {
569 qstats->drops++;
570 }
571
572 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
573 {
574 qstats->overlimits++;
575 }
576
577 static inline void qdisc_qstats_drop(struct Qdisc *sch)
578 {
579 qstats_drop_inc(&sch->qstats);
580 }
581
582 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
583 {
584 qstats_drop_inc(this_cpu_ptr(sch->cpu_qstats));
585 }
586
587 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
588 {
589 sch->qstats.overlimits++;
590 }
591
592 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
593 struct sk_buff_head *list)
594 {
595 __skb_queue_tail(list, skb);
596 qdisc_qstats_backlog_inc(sch, skb);
597
598 return NET_XMIT_SUCCESS;
599 }
600
601 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
602 {
603 return __qdisc_enqueue_tail(skb, sch, &sch->q);
604 }
605
606 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
607 struct sk_buff_head *list)
608 {
609 struct sk_buff *skb = __skb_dequeue(list);
610
611 if (likely(skb != NULL)) {
612 qdisc_qstats_backlog_dec(sch, skb);
613 qdisc_bstats_update(sch, skb);
614 }
615
616 return skb;
617 }
618
619 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
620 {
621 return __qdisc_dequeue_head(sch, &sch->q);
622 }
623
624 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
625 struct sk_buff_head *list)
626 {
627 struct sk_buff *skb = __skb_dequeue(list);
628
629 if (likely(skb != NULL)) {
630 unsigned int len = qdisc_pkt_len(skb);
631 qdisc_qstats_backlog_dec(sch, skb);
632 kfree_skb(skb);
633 return len;
634 }
635
636 return 0;
637 }
638
639 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
640 {
641 return __qdisc_queue_drop_head(sch, &sch->q);
642 }
643
644 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
645 struct sk_buff_head *list)
646 {
647 struct sk_buff *skb = __skb_dequeue_tail(list);
648
649 if (likely(skb != NULL))
650 qdisc_qstats_backlog_dec(sch, skb);
651
652 return skb;
653 }
654
655 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
656 {
657 return __qdisc_dequeue_tail(sch, &sch->q);
658 }
659
660 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
661 {
662 return skb_peek(&sch->q);
663 }
664
665 /* generic pseudo peek method for non-work-conserving qdisc */
666 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
667 {
668 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
669 if (!sch->gso_skb) {
670 sch->gso_skb = sch->dequeue(sch);
671 if (sch->gso_skb)
672 /* it's still part of the queue */
673 sch->q.qlen++;
674 }
675
676 return sch->gso_skb;
677 }
678
679 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
680 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
681 {
682 struct sk_buff *skb = sch->gso_skb;
683
684 if (skb) {
685 sch->gso_skb = NULL;
686 sch->q.qlen--;
687 } else {
688 skb = sch->dequeue(sch);
689 }
690
691 return skb;
692 }
693
694 static inline void __qdisc_reset_queue(struct Qdisc *sch,
695 struct sk_buff_head *list)
696 {
697 /*
698 * We do not know the backlog in bytes of this list, it
699 * is up to the caller to correct it
700 */
701 __skb_queue_purge(list);
702 }
703
704 static inline void qdisc_reset_queue(struct Qdisc *sch)
705 {
706 __qdisc_reset_queue(sch, &sch->q);
707 sch->qstats.backlog = 0;
708 }
709
710 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
711 struct sk_buff_head *list)
712 {
713 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
714
715 if (likely(skb != NULL)) {
716 unsigned int len = qdisc_pkt_len(skb);
717 kfree_skb(skb);
718 return len;
719 }
720
721 return 0;
722 }
723
724 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
725 {
726 return __qdisc_queue_drop(sch, &sch->q);
727 }
728
729 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
730 {
731 kfree_skb(skb);
732 qdisc_qstats_drop(sch);
733
734 return NET_XMIT_DROP;
735 }
736
737 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
738 {
739 qdisc_qstats_drop(sch);
740
741 #ifdef CONFIG_NET_CLS_ACT
742 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
743 goto drop;
744
745 return NET_XMIT_SUCCESS;
746
747 drop:
748 #endif
749 kfree_skb(skb);
750 return NET_XMIT_DROP;
751 }
752
753 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
754 long it will take to send a packet given its size.
755 */
756 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
757 {
758 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
759 if (slot < 0)
760 slot = 0;
761 slot >>= rtab->rate.cell_log;
762 if (slot > 255)
763 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
764 return rtab->data[slot];
765 }
766
767 struct psched_ratecfg {
768 u64 rate_bytes_ps; /* bytes per second */
769 u32 mult;
770 u16 overhead;
771 u8 linklayer;
772 u8 shift;
773 };
774
775 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
776 unsigned int len)
777 {
778 len += r->overhead;
779
780 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
781 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
782
783 return ((u64)len * r->mult) >> r->shift;
784 }
785
786 void psched_ratecfg_precompute(struct psched_ratecfg *r,
787 const struct tc_ratespec *conf,
788 u64 rate64);
789
790 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
791 const struct psched_ratecfg *r)
792 {
793 memset(res, 0, sizeof(*res));
794
795 /* legacy struct tc_ratespec has a 32bit @rate field
796 * Qdisc using 64bit rate should add new attributes
797 * in order to maintain compatibility.
798 */
799 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
800
801 res->overhead = r->overhead;
802 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
803 }
804
805 #endif
Linux with added FPC-III support