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Linux 4.8-rc8
[linux/fpc-iii.git] / include / net / sch_generic.h
blob909aff2db2b36b11d4b92f261a5a90e750cd59bc
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 };
30
31 struct qdisc_size_table {
32 struct rcu_head rcu;
33 struct list_head list;
34 struct tc_sizespec szopts;
35 int refcnt;
36 u16 data[];
37 };
38
39 struct Qdisc {
40 int (*enqueue)(struct sk_buff *skb,
41 struct Qdisc *sch,
42 struct sk_buff **to_free);
43 struct sk_buff * (*dequeue)(struct Qdisc *sch);
44 unsigned int flags;
45 #define TCQ_F_BUILTIN 1
46 #define TCQ_F_INGRESS 2
47 #define TCQ_F_CAN_BYPASS 4
48 #define TCQ_F_MQROOT 8
49 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
50 * q->dev_queue : It can test
51 * netif_xmit_frozen_or_stopped() before
52 * dequeueing next packet.
53 * Its true for MQ/MQPRIO slaves, or non
54 * multiqueue device.
55 */
56 #define TCQ_F_WARN_NONWC (1 << 16)
57 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
58 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
59 * qdisc_tree_decrease_qlen() should stop.
60 */
61 u32 limit;
62 const struct Qdisc_ops *ops;
63 struct qdisc_size_table __rcu *stab;
64 struct list_head list;
65 u32 handle;
66 u32 parent;
67 void *u32_node;
68
69 struct netdev_queue *dev_queue;
70
71 struct gnet_stats_rate_est64 rate_est;
72 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
73 struct gnet_stats_queue __percpu *cpu_qstats;
74
75 /*
76 * For performance sake on SMP, we put highly modified fields at the end
77 */
78 struct sk_buff *gso_skb ____cacheline_aligned_in_smp;
79 struct sk_buff_head q;
80 struct gnet_stats_basic_packed bstats;
81 seqcount_t running;
82 struct gnet_stats_queue qstats;
83 unsigned long state;
84 struct Qdisc *next_sched;
85 struct sk_buff *skb_bad_txq;
86 struct rcu_head rcu_head;
87 int padded;
88 atomic_t refcnt;
89
90 spinlock_t busylock ____cacheline_aligned_in_smp;
91 };
92
93 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
94 {
95 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
96 }
97
98 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
99 {
100 if (qdisc_is_running(qdisc))
101 return false;
102 /* Variant of write_seqcount_begin() telling lockdep a trylock
103 * was attempted.
104 */
105 raw_write_seqcount_begin(&qdisc->running);
106 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
107 return true;
108 }
109
110 static inline void qdisc_run_end(struct Qdisc *qdisc)
111 {
112 write_seqcount_end(&qdisc->running);
113 }
114
115 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
116 {
117 return qdisc->flags & TCQ_F_ONETXQUEUE;
118 }
119
120 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
121 {
122 #ifdef CONFIG_BQL
123 /* Non-BQL migrated drivers will return 0, too. */
124 return dql_avail(&txq->dql);
125 #else
126 return 0;
127 #endif
128 }
129
130 struct Qdisc_class_ops {
131 /* Child qdisc manipulation */
132 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
133 int (*graft)(struct Qdisc *, unsigned long cl,
134 struct Qdisc *, struct Qdisc **);
135 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
136 void (*qlen_notify)(struct Qdisc *, unsigned long);
137
138 /* Class manipulation routines */
139 unsigned long (*get)(struct Qdisc *, u32 classid);
140 void (*put)(struct Qdisc *, unsigned long);
141 int (*change)(struct Qdisc *, u32, u32,
142 struct nlattr **, unsigned long *);
143 int (*delete)(struct Qdisc *, unsigned long);
144 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
145
146 /* Filter manipulation */
147 struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long);
148 bool (*tcf_cl_offload)(u32 classid);
149 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
150 u32 classid);
151 void (*unbind_tcf)(struct Qdisc *, unsigned long);
152
153 /* rtnetlink specific */
154 int (*dump)(struct Qdisc *, unsigned long,
155 struct sk_buff *skb, struct tcmsg*);
156 int (*dump_stats)(struct Qdisc *, unsigned long,
157 struct gnet_dump *);
158 };
159
160 struct Qdisc_ops {
161 struct Qdisc_ops *next;
162 const struct Qdisc_class_ops *cl_ops;
163 char id[IFNAMSIZ];
164 int priv_size;
165
166 int (*enqueue)(struct sk_buff *skb,
167 struct Qdisc *sch,
168 struct sk_buff **to_free);
169 struct sk_buff * (*dequeue)(struct Qdisc *);
170 struct sk_buff * (*peek)(struct Qdisc *);
171
172 int (*init)(struct Qdisc *, struct nlattr *arg);
173 void (*reset)(struct Qdisc *);
174 void (*destroy)(struct Qdisc *);
175 int (*change)(struct Qdisc *, struct nlattr *arg);
176 void (*attach)(struct Qdisc *);
177
178 int (*dump)(struct Qdisc *, struct sk_buff *);
179 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
180
181 struct module *owner;
182 };
183
184
185 struct tcf_result {
186 unsigned long class;
187 u32 classid;
188 };
189
190 struct tcf_proto_ops {
191 struct list_head head;
192 char kind[IFNAMSIZ];
193
194 int (*classify)(struct sk_buff *,
195 const struct tcf_proto *,
196 struct tcf_result *);
197 int (*init)(struct tcf_proto*);
198 bool (*destroy)(struct tcf_proto*, bool);
199
200 unsigned long (*get)(struct tcf_proto*, u32 handle);
201 int (*change)(struct net *net, struct sk_buff *,
202 struct tcf_proto*, unsigned long,
203 u32 handle, struct nlattr **,
204 unsigned long *, bool);
205 int (*delete)(struct tcf_proto*, unsigned long);
206 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
207
208 /* rtnetlink specific */
209 int (*dump)(struct net*, struct tcf_proto*, unsigned long,
210 struct sk_buff *skb, struct tcmsg*);
211
212 struct module *owner;
213 };
214
215 struct tcf_proto {
216 /* Fast access part */
217 struct tcf_proto __rcu *next;
218 void __rcu *root;
219 int (*classify)(struct sk_buff *,
220 const struct tcf_proto *,
221 struct tcf_result *);
222 __be16 protocol;
223
224 /* All the rest */
225 u32 prio;
226 u32 classid;
227 struct Qdisc *q;
228 void *data;
229 const struct tcf_proto_ops *ops;
230 struct rcu_head rcu;
231 };
232
233 struct qdisc_skb_cb {
234 unsigned int pkt_len;
235 u16 slave_dev_queue_mapping;
236 u16 tc_classid;
237 #define QDISC_CB_PRIV_LEN 20
238 unsigned char data[QDISC_CB_PRIV_LEN];
239 };
240
241 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
242 {
243 struct qdisc_skb_cb *qcb;
244
245 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
246 BUILD_BUG_ON(sizeof(qcb->data) < sz);
247 }
248
249 static inline int qdisc_qlen(const struct Qdisc *q)
250 {
251 return q->q.qlen;
252 }
253
254 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
255 {
256 return (struct qdisc_skb_cb *)skb->cb;
257 }
258
259 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
260 {
261 return &qdisc->q.lock;
262 }
263
264 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
265 {
266 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
267
268 return q;
269 }
270
271 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
272 {
273 return qdisc->dev_queue->qdisc_sleeping;
274 }
275
276 /* The qdisc root lock is a mechanism by which to top level
277 * of a qdisc tree can be locked from any qdisc node in the
278 * forest. This allows changing the configuration of some
279 * aspect of the qdisc tree while blocking out asynchronous
280 * qdisc access in the packet processing paths.
281 *
282 * It is only legal to do this when the root will not change
283 * on us. Otherwise we'll potentially lock the wrong qdisc
284 * root. This is enforced by holding the RTNL semaphore, which
285 * all users of this lock accessor must do.
286 */
287 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
288 {
289 struct Qdisc *root = qdisc_root(qdisc);
290
291 ASSERT_RTNL();
292 return qdisc_lock(root);
293 }
294
295 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
296 {
297 struct Qdisc *root = qdisc_root_sleeping(qdisc);
298
299 ASSERT_RTNL();
300 return qdisc_lock(root);
301 }
302
303 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
304 {
305 struct Qdisc *root = qdisc_root_sleeping(qdisc);
306
307 ASSERT_RTNL();
308 return &root->running;
309 }
310
311 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
312 {
313 return qdisc->dev_queue->dev;
314 }
315
316 static inline void sch_tree_lock(const struct Qdisc *q)
317 {
318 spin_lock_bh(qdisc_root_sleeping_lock(q));
319 }
320
321 static inline void sch_tree_unlock(const struct Qdisc *q)
322 {
323 spin_unlock_bh(qdisc_root_sleeping_lock(q));
324 }
325
326 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
327 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
328
329 extern struct Qdisc noop_qdisc;
330 extern struct Qdisc_ops noop_qdisc_ops;
331 extern struct Qdisc_ops pfifo_fast_ops;
332 extern struct Qdisc_ops mq_qdisc_ops;
333 extern struct Qdisc_ops noqueue_qdisc_ops;
334 extern const struct Qdisc_ops *default_qdisc_ops;
335 static inline const struct Qdisc_ops *
336 get_default_qdisc_ops(const struct net_device *dev, int ntx)
337 {
338 return ntx < dev->real_num_tx_queues ?
339 default_qdisc_ops : &pfifo_fast_ops;
340 }
341
342 struct Qdisc_class_common {
343 u32 classid;
344 struct hlist_node hnode;
345 };
346
347 struct Qdisc_class_hash {
348 struct hlist_head *hash;
349 unsigned int hashsize;
350 unsigned int hashmask;
351 unsigned int hashelems;
352 };
353
354 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
355 {
356 id ^= id >> 8;
357 id ^= id >> 4;
358 return id & mask;
359 }
360
361 static inline struct Qdisc_class_common *
362 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
363 {
364 struct Qdisc_class_common *cl;
365 unsigned int h;
366
367 h = qdisc_class_hash(id, hash->hashmask);
368 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
369 if (cl->classid == id)
370 return cl;
371 }
372 return NULL;
373 }
374
375 int qdisc_class_hash_init(struct Qdisc_class_hash *);
376 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
377 struct Qdisc_class_common *);
378 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
379 struct Qdisc_class_common *);
380 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
381 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
382
383 void dev_init_scheduler(struct net_device *dev);
384 void dev_shutdown(struct net_device *dev);
385 void dev_activate(struct net_device *dev);
386 void dev_deactivate(struct net_device *dev);
387 void dev_deactivate_many(struct list_head *head);
388 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
389 struct Qdisc *qdisc);
390 void qdisc_reset(struct Qdisc *qdisc);
391 void qdisc_destroy(struct Qdisc *qdisc);
392 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
393 unsigned int len);
394 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
395 const struct Qdisc_ops *ops);
396 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
397 const struct Qdisc_ops *ops, u32 parentid);
398 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
399 const struct qdisc_size_table *stab);
400 bool tcf_destroy(struct tcf_proto *tp, bool force);
401 void tcf_destroy_chain(struct tcf_proto __rcu **fl);
402 int skb_do_redirect(struct sk_buff *);
403
404 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
405 {
406 #ifdef CONFIG_NET_CLS_ACT
407 return G_TC_AT(skb->tc_verd) & AT_INGRESS;
408 #else
409 return false;
410 #endif
411 }
412
413 /* Reset all TX qdiscs greater then index of a device. */
414 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
415 {
416 struct Qdisc *qdisc;
417
418 for (; i < dev->num_tx_queues; i++) {
419 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
420 if (qdisc) {
421 spin_lock_bh(qdisc_lock(qdisc));
422 qdisc_reset(qdisc);
423 spin_unlock_bh(qdisc_lock(qdisc));
424 }
425 }
426 }
427
428 static inline void qdisc_reset_all_tx(struct net_device *dev)
429 {
430 qdisc_reset_all_tx_gt(dev, 0);
431 }
432
433 /* Are all TX queues of the device empty? */
434 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
435 {
436 unsigned int i;
437
438 rcu_read_lock();
439 for (i = 0; i < dev->num_tx_queues; i++) {
440 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
441 const struct Qdisc *q = rcu_dereference(txq->qdisc);
442
443 if (q->q.qlen) {
444 rcu_read_unlock();
445 return false;
446 }
447 }
448 rcu_read_unlock();
449 return true;
450 }
451
452 /* Are any of the TX qdiscs changing? */
453 static inline bool qdisc_tx_changing(const struct net_device *dev)
454 {
455 unsigned int i;
456
457 for (i = 0; i < dev->num_tx_queues; i++) {
458 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
459 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
460 return true;
461 }
462 return false;
463 }
464
465 /* Is the device using the noop qdisc on all queues? */
466 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
467 {
468 unsigned int i;
469
470 for (i = 0; i < dev->num_tx_queues; i++) {
471 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
472 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
473 return false;
474 }
475 return true;
476 }
477
478 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
479 {
480 return qdisc_skb_cb(skb)->pkt_len;
481 }
482
483 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
484 enum net_xmit_qdisc_t {
485 __NET_XMIT_STOLEN = 0x00010000,
486 __NET_XMIT_BYPASS = 0x00020000,
487 };
488
489 #ifdef CONFIG_NET_CLS_ACT
490 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
491 #else
492 #define net_xmit_drop_count(e) (1)
493 #endif
494
495 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
496 const struct Qdisc *sch)
497 {
498 #ifdef CONFIG_NET_SCHED
499 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
500
501 if (stab)
502 __qdisc_calculate_pkt_len(skb, stab);
503 #endif
504 }
505
506 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
507 struct sk_buff **to_free)
508 {
509 qdisc_calculate_pkt_len(skb, sch);
510 return sch->enqueue(skb, sch, to_free);
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 __u64 bytes, __u32 packets)
520 {
521 bstats->bytes += bytes;
522 bstats->packets += packets;
523 }
524
525 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
526 const struct sk_buff *skb)
527 {
528 _bstats_update(bstats,
529 qdisc_pkt_len(skb),
530 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
531 }
532
533 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
534 __u64 bytes, __u32 packets)
535 {
536 u64_stats_update_begin(&bstats->syncp);
537 _bstats_update(&bstats->bstats, bytes, packets);
538 u64_stats_update_end(&bstats->syncp);
539 }
540
541 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
542 const struct sk_buff *skb)
543 {
544 u64_stats_update_begin(&bstats->syncp);
545 bstats_update(&bstats->bstats, skb);
546 u64_stats_update_end(&bstats->syncp);
547 }
548
549 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
550 const struct sk_buff *skb)
551 {
552 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
553 }
554
555 static inline void qdisc_bstats_update(struct Qdisc *sch,
556 const struct sk_buff *skb)
557 {
558 bstats_update(&sch->bstats, skb);
559 }
560
561 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
562 const struct sk_buff *skb)
563 {
564 sch->qstats.backlog -= qdisc_pkt_len(skb);
565 }
566
567 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
568 const struct sk_buff *skb)
569 {
570 sch->qstats.backlog += qdisc_pkt_len(skb);
571 }
572
573 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
574 {
575 sch->qstats.drops += count;
576 }
577
578 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
579 {
580 qstats->drops++;
581 }
582
583 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
584 {
585 qstats->overlimits++;
586 }
587
588 static inline void qdisc_qstats_drop(struct Qdisc *sch)
589 {
590 qstats_drop_inc(&sch->qstats);
591 }
592
593 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
594 {
595 qstats_drop_inc(this_cpu_ptr(sch->cpu_qstats));
596 }
597
598 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
599 {
600 sch->qstats.overlimits++;
601 }
602
603 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
604 struct sk_buff_head *list)
605 {
606 __skb_queue_tail(list, skb);
607 qdisc_qstats_backlog_inc(sch, skb);
608
609 return NET_XMIT_SUCCESS;
610 }
611
612 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
613 {
614 return __qdisc_enqueue_tail(skb, sch, &sch->q);
615 }
616
617 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
618 struct sk_buff_head *list)
619 {
620 struct sk_buff *skb = __skb_dequeue(list);
621
622 if (likely(skb != NULL)) {
623 qdisc_qstats_backlog_dec(sch, skb);
624 qdisc_bstats_update(sch, skb);
625 }
626
627 return skb;
628 }
629
630 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
631 {
632 return __qdisc_dequeue_head(sch, &sch->q);
633 }
634
635 /* Instead of calling kfree_skb() while root qdisc lock is held,
636 * queue the skb for future freeing at end of __dev_xmit_skb()
637 */
638 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
639 {
640 skb->next = *to_free;
641 *to_free = skb;
642 }
643
644 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
645 struct sk_buff_head *list,
646 struct sk_buff **to_free)
647 {
648 struct sk_buff *skb = __skb_dequeue(list);
649
650 if (likely(skb != NULL)) {
651 unsigned int len = qdisc_pkt_len(skb);
652
653 qdisc_qstats_backlog_dec(sch, skb);
654 __qdisc_drop(skb, to_free);
655 return len;
656 }
657
658 return 0;
659 }
660
661 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
662 struct sk_buff **to_free)
663 {
664 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
665 }
666
667 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
668 {
669 return skb_peek(&sch->q);
670 }
671
672 /* generic pseudo peek method for non-work-conserving qdisc */
673 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
674 {
675 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
676 if (!sch->gso_skb) {
677 sch->gso_skb = sch->dequeue(sch);
678 if (sch->gso_skb) {
679 /* it's still part of the queue */
680 qdisc_qstats_backlog_inc(sch, sch->gso_skb);
681 sch->q.qlen++;
682 }
683 }
684
685 return sch->gso_skb;
686 }
687
688 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
689 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
690 {
691 struct sk_buff *skb = sch->gso_skb;
692
693 if (skb) {
694 sch->gso_skb = NULL;
695 qdisc_qstats_backlog_dec(sch, skb);
696 sch->q.qlen--;
697 } else {
698 skb = sch->dequeue(sch);
699 }
700
701 return skb;
702 }
703
704 static inline void __qdisc_reset_queue(struct sk_buff_head *list)
705 {
706 /*
707 * We do not know the backlog in bytes of this list, it
708 * is up to the caller to correct it
709 */
710 if (!skb_queue_empty(list)) {
711 rtnl_kfree_skbs(list->next, list->prev);
712 __skb_queue_head_init(list);
713 }
714 }
715
716 static inline void qdisc_reset_queue(struct Qdisc *sch)
717 {
718 __qdisc_reset_queue(&sch->q);
719 sch->qstats.backlog = 0;
720 }
721
722 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
723 struct Qdisc **pold)
724 {
725 struct Qdisc *old;
726
727 sch_tree_lock(sch);
728 old = *pold;
729 *pold = new;
730 if (old != NULL) {
731 qdisc_tree_reduce_backlog(old, old->q.qlen, old->qstats.backlog);
732 qdisc_reset(old);
733 }
734 sch_tree_unlock(sch);
735
736 return old;
737 }
738
739 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
740 {
741 rtnl_kfree_skbs(skb, skb);
742 qdisc_qstats_drop(sch);
743 }
744
745
746 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
747 struct sk_buff **to_free)
748 {
749 __qdisc_drop(skb, to_free);
750 qdisc_qstats_drop(sch);
751
752 return NET_XMIT_DROP;
753 }
754
755 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
756 long it will take to send a packet given its size.
757 */
758 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
759 {
760 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
761 if (slot < 0)
762 slot = 0;
763 slot >>= rtab->rate.cell_log;
764 if (slot > 255)
765 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
766 return rtab->data[slot];
767 }
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
Linux with added FPC-III support