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
14struct Qdisc_ops;
15struct qdisc_walker;
16struct tcf_walker;
17struct module;
18
19struct qdisc_rate_table {
20 struct tc_ratespec rate;
21 u32 data[256];
22 struct qdisc_rate_table *next;
23 int refcnt;
24};
25
26enum qdisc_state_t {
27 __QDISC_STATE_SCHED,
28 __QDISC_STATE_DEACTIVATED,
29};
30
31struct 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
40struct qdisc_skb_head {
41 struct sk_buff *head;
42 struct sk_buff *tail;
43 __u32 qlen;
44 spinlock_t lock;
45};
46
47struct Qdisc {
48 int (*enqueue)(struct sk_buff *skb,
49 struct Qdisc *sch,
50 struct sk_buff **to_free);
51 struct sk_buff * (*dequeue)(struct Qdisc *sch);
52 unsigned int flags;
53#define TCQ_F_BUILTIN 1
54#define TCQ_F_INGRESS 2
55#define TCQ_F_CAN_BYPASS 4
56#define TCQ_F_MQROOT 8
57#define TCQ_F_ONETXQUEUE 0x10
58
59
60
61
62
63
64#define TCQ_F_WARN_NONWC (1 << 16)
65#define TCQ_F_CPUSTATS 0x20
66#define TCQ_F_NOPARENT 0x40
67
68
69#define TCQ_F_INVISIBLE 0x80
70 u32 limit;
71 const struct Qdisc_ops *ops;
72 struct qdisc_size_table __rcu *stab;
73 struct hlist_node hash;
74 u32 handle;
75 u32 parent;
76 void *u32_node;
77
78 struct netdev_queue *dev_queue;
79
80 struct net_rate_estimator __rcu *rate_est;
81 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
82 struct gnet_stats_queue __percpu *cpu_qstats;
83
84
85
86
87 struct sk_buff *gso_skb ____cacheline_aligned_in_smp;
88 struct qdisc_skb_head q;
89 struct gnet_stats_basic_packed bstats;
90 seqcount_t running;
91 struct gnet_stats_queue qstats;
92 unsigned long state;
93 struct Qdisc *next_sched;
94 struct sk_buff *skb_bad_txq;
95 struct rcu_head rcu_head;
96 int padded;
97 atomic_t refcnt;
98
99 spinlock_t busylock ____cacheline_aligned_in_smp;
100};
101
102static inline bool qdisc_is_running(const struct Qdisc *qdisc)
103{
104 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
105}
106
107static inline bool qdisc_run_begin(struct Qdisc *qdisc)
108{
109 if (qdisc_is_running(qdisc))
110 return false;
111
112
113
114 raw_write_seqcount_begin(&qdisc->running);
115 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
116 return true;
117}
118
119static inline void qdisc_run_end(struct Qdisc *qdisc)
120{
121 write_seqcount_end(&qdisc->running);
122}
123
124static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
125{
126 return qdisc->flags & TCQ_F_ONETXQUEUE;
127}
128
129static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
130{
131#ifdef CONFIG_BQL
132
133 return dql_avail(&txq->dql);
134#else
135 return 0;
136#endif
137}
138
139struct Qdisc_class_ops {
140
141 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
142 int (*graft)(struct Qdisc *, unsigned long cl,
143 struct Qdisc *, struct Qdisc **);
144 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
145 void (*qlen_notify)(struct Qdisc *, unsigned long);
146
147
148 unsigned long (*get)(struct Qdisc *, u32 classid);
149 void (*put)(struct Qdisc *, unsigned long);
150 int (*change)(struct Qdisc *, u32, u32,
151 struct nlattr **, unsigned long *);
152 int (*delete)(struct Qdisc *, unsigned long);
153 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
154
155
156 struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long);
157 bool (*tcf_cl_offload)(u32 classid);
158 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
159 u32 classid);
160 void (*unbind_tcf)(struct Qdisc *, unsigned long);
161
162
163 int (*dump)(struct Qdisc *, unsigned long,
164 struct sk_buff *skb, struct tcmsg*);
165 int (*dump_stats)(struct Qdisc *, unsigned long,
166 struct gnet_dump *);
167};
168
169struct Qdisc_ops {
170 struct Qdisc_ops *next;
171 const struct Qdisc_class_ops *cl_ops;
172 char id[IFNAMSIZ];
173 int priv_size;
174
175 int (*enqueue)(struct sk_buff *skb,
176 struct Qdisc *sch,
177 struct sk_buff **to_free);
178 struct sk_buff * (*dequeue)(struct Qdisc *);
179 struct sk_buff * (*peek)(struct Qdisc *);
180
181 int (*init)(struct Qdisc *, struct nlattr *arg);
182 void (*reset)(struct Qdisc *);
183 void (*destroy)(struct Qdisc *);
184 int (*change)(struct Qdisc *, struct nlattr *arg);
185 void (*attach)(struct Qdisc *);
186
187 int (*dump)(struct Qdisc *, struct sk_buff *);
188 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
189
190 struct module *owner;
191};
192
193
194struct tcf_result {
195 unsigned long class;
196 u32 classid;
197};
198
199struct tcf_proto_ops {
200 struct list_head head;
201 char kind[IFNAMSIZ];
202
203 int (*classify)(struct sk_buff *,
204 const struct tcf_proto *,
205 struct tcf_result *);
206 int (*init)(struct tcf_proto*);
207 void (*destroy)(struct tcf_proto*);
208
209 unsigned long (*get)(struct tcf_proto*, u32 handle);
210 int (*change)(struct net *net, struct sk_buff *,
211 struct tcf_proto*, unsigned long,
212 u32 handle, struct nlattr **,
213 unsigned long *, bool);
214 int (*delete)(struct tcf_proto*, unsigned long, bool*);
215 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
216
217
218 int (*dump)(struct net*, struct tcf_proto*, unsigned long,
219 struct sk_buff *skb, struct tcmsg*);
220
221 struct module *owner;
222};
223
224struct tcf_proto {
225
226 struct tcf_proto __rcu *next;
227 void __rcu *root;
228 int (*classify)(struct sk_buff *,
229 const struct tcf_proto *,
230 struct tcf_result *);
231 __be16 protocol;
232
233
234 u32 prio;
235 u32 classid;
236 struct Qdisc *q;
237 void *data;
238 const struct tcf_proto_ops *ops;
239 struct rcu_head rcu;
240};
241
242struct qdisc_skb_cb {
243 unsigned int pkt_len;
244 u16 slave_dev_queue_mapping;
245 u16 tc_classid;
246#define QDISC_CB_PRIV_LEN 20
247 unsigned char data[QDISC_CB_PRIV_LEN];
248};
249
250static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
251{
252 struct qdisc_skb_cb *qcb;
253
254 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
255 BUILD_BUG_ON(sizeof(qcb->data) < sz);
256}
257
258static inline int qdisc_qlen(const struct Qdisc *q)
259{
260 return q->q.qlen;
261}
262
263static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
264{
265 return (struct qdisc_skb_cb *)skb->cb;
266}
267
268static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
269{
270 return &qdisc->q.lock;
271}
272
273static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
274{
275 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
276
277 return q;
278}
279
280static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
281{
282 return qdisc->dev_queue->qdisc_sleeping;
283}
284
285
286
287
288
289
290
291
292
293
294
295
296static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
297{
298 struct Qdisc *root = qdisc_root(qdisc);
299
300 ASSERT_RTNL();
301 return qdisc_lock(root);
302}
303
304static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
305{
306 struct Qdisc *root = qdisc_root_sleeping(qdisc);
307
308 ASSERT_RTNL();
309 return qdisc_lock(root);
310}
311
312static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
313{
314 struct Qdisc *root = qdisc_root_sleeping(qdisc);
315
316 ASSERT_RTNL();
317 return &root->running;
318}
319
320static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
321{
322 return qdisc->dev_queue->dev;
323}
324
325static inline void sch_tree_lock(const struct Qdisc *q)
326{
327 spin_lock_bh(qdisc_root_sleeping_lock(q));
328}
329
330static inline void sch_tree_unlock(const struct Qdisc *q)
331{
332 spin_unlock_bh(qdisc_root_sleeping_lock(q));
333}
334
335#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
336#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
337
338extern struct Qdisc noop_qdisc;
339extern struct Qdisc_ops noop_qdisc_ops;
340extern struct Qdisc_ops pfifo_fast_ops;
341extern struct Qdisc_ops mq_qdisc_ops;
342extern struct Qdisc_ops noqueue_qdisc_ops;
343extern const struct Qdisc_ops *default_qdisc_ops;
344static inline const struct Qdisc_ops *
345get_default_qdisc_ops(const struct net_device *dev, int ntx)
346{
347 return ntx < dev->real_num_tx_queues ?
348 default_qdisc_ops : &pfifo_fast_ops;
349}
350
351struct Qdisc_class_common {
352 u32 classid;
353 struct hlist_node hnode;
354};
355
356struct Qdisc_class_hash {
357 struct hlist_head *hash;
358 unsigned int hashsize;
359 unsigned int hashmask;
360 unsigned int hashelems;
361};
362
363static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
364{
365 id ^= id >> 8;
366 id ^= id >> 4;
367 return id & mask;
368}
369
370static inline struct Qdisc_class_common *
371qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
372{
373 struct Qdisc_class_common *cl;
374 unsigned int h;
375
376 h = qdisc_class_hash(id, hash->hashmask);
377 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
378 if (cl->classid == id)
379 return cl;
380 }
381 return NULL;
382}
383
384int qdisc_class_hash_init(struct Qdisc_class_hash *);
385void qdisc_class_hash_insert(struct Qdisc_class_hash *,
386 struct Qdisc_class_common *);
387void qdisc_class_hash_remove(struct Qdisc_class_hash *,
388 struct Qdisc_class_common *);
389void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
390void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
391
392void dev_init_scheduler(struct net_device *dev);
393void dev_shutdown(struct net_device *dev);
394void dev_activate(struct net_device *dev);
395void dev_deactivate(struct net_device *dev);
396void dev_deactivate_many(struct list_head *head);
397struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
398 struct Qdisc *qdisc);
399void qdisc_reset(struct Qdisc *qdisc);
400void qdisc_destroy(struct Qdisc *qdisc);
401void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
402 unsigned int len);
403struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
404 const struct Qdisc_ops *ops);
405struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
406 const struct Qdisc_ops *ops, u32 parentid);
407void __qdisc_calculate_pkt_len(struct sk_buff *skb,
408 const struct qdisc_size_table *stab);
409int skb_do_redirect(struct sk_buff *);
410
411static inline void skb_reset_tc(struct sk_buff *skb)
412{
413#ifdef CONFIG_NET_CLS_ACT
414 skb->tc_redirected = 0;
415#endif
416}
417
418static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
419{
420#ifdef CONFIG_NET_CLS_ACT
421 return skb->tc_at_ingress;
422#else
423 return false;
424#endif
425}
426
427static inline bool skb_skip_tc_classify(struct sk_buff *skb)
428{
429#ifdef CONFIG_NET_CLS_ACT
430 if (skb->tc_skip_classify) {
431 skb->tc_skip_classify = 0;
432 return true;
433 }
434#endif
435 return false;
436}
437
438
439static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
440{
441 struct Qdisc *qdisc;
442
443 for (; i < dev->num_tx_queues; i++) {
444 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
445 if (qdisc) {
446 spin_lock_bh(qdisc_lock(qdisc));
447 qdisc_reset(qdisc);
448 spin_unlock_bh(qdisc_lock(qdisc));
449 }
450 }
451}
452
453static inline void qdisc_reset_all_tx(struct net_device *dev)
454{
455 qdisc_reset_all_tx_gt(dev, 0);
456}
457
458
459static inline bool qdisc_all_tx_empty(const struct net_device *dev)
460{
461 unsigned int i;
462
463 rcu_read_lock();
464 for (i = 0; i < dev->num_tx_queues; i++) {
465 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
466 const struct Qdisc *q = rcu_dereference(txq->qdisc);
467
468 if (q->q.qlen) {
469 rcu_read_unlock();
470 return false;
471 }
472 }
473 rcu_read_unlock();
474 return true;
475}
476
477
478static inline bool qdisc_tx_changing(const struct net_device *dev)
479{
480 unsigned int i;
481
482 for (i = 0; i < dev->num_tx_queues; i++) {
483 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
484 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
485 return true;
486 }
487 return false;
488}
489
490
491static inline bool qdisc_tx_is_noop(const struct net_device *dev)
492{
493 unsigned int i;
494
495 for (i = 0; i < dev->num_tx_queues; i++) {
496 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
497 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
498 return false;
499 }
500 return true;
501}
502
503static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
504{
505 return qdisc_skb_cb(skb)->pkt_len;
506}
507
508
509enum net_xmit_qdisc_t {
510 __NET_XMIT_STOLEN = 0x00010000,
511 __NET_XMIT_BYPASS = 0x00020000,
512};
513
514#ifdef CONFIG_NET_CLS_ACT
515#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
516#else
517#define net_xmit_drop_count(e) (1)
518#endif
519
520static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
521 const struct Qdisc *sch)
522{
523#ifdef CONFIG_NET_SCHED
524 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
525
526 if (stab)
527 __qdisc_calculate_pkt_len(skb, stab);
528#endif
529}
530
531static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
532 struct sk_buff **to_free)
533{
534 qdisc_calculate_pkt_len(skb, sch);
535 return sch->enqueue(skb, sch, to_free);
536}
537
538static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
539{
540 return q->flags & TCQ_F_CPUSTATS;
541}
542
543static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
544 __u64 bytes, __u32 packets)
545{
546 bstats->bytes += bytes;
547 bstats->packets += packets;
548}
549
550static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
551 const struct sk_buff *skb)
552{
553 _bstats_update(bstats,
554 qdisc_pkt_len(skb),
555 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
556}
557
558static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
559 __u64 bytes, __u32 packets)
560{
561 u64_stats_update_begin(&bstats->syncp);
562 _bstats_update(&bstats->bstats, bytes, packets);
563 u64_stats_update_end(&bstats->syncp);
564}
565
566static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
567 const struct sk_buff *skb)
568{
569 u64_stats_update_begin(&bstats->syncp);
570 bstats_update(&bstats->bstats, skb);
571 u64_stats_update_end(&bstats->syncp);
572}
573
574static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
575 const struct sk_buff *skb)
576{
577 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
578}
579
580static inline void qdisc_bstats_update(struct Qdisc *sch,
581 const struct sk_buff *skb)
582{
583 bstats_update(&sch->bstats, skb);
584}
585
586static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
587 const struct sk_buff *skb)
588{
589 sch->qstats.backlog -= qdisc_pkt_len(skb);
590}
591
592static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
593 const struct sk_buff *skb)
594{
595 sch->qstats.backlog += qdisc_pkt_len(skb);
596}
597
598static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
599{
600 sch->qstats.drops += count;
601}
602
603static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
604{
605 qstats->drops++;
606}
607
608static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
609{
610 qstats->overlimits++;
611}
612
613static inline void qdisc_qstats_drop(struct Qdisc *sch)
614{
615 qstats_drop_inc(&sch->qstats);
616}
617
618static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
619{
620 this_cpu_inc(sch->cpu_qstats->drops);
621}
622
623static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
624{
625 sch->qstats.overlimits++;
626}
627
628static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
629{
630 qh->head = NULL;
631 qh->tail = NULL;
632 qh->qlen = 0;
633}
634
635static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
636 struct qdisc_skb_head *qh)
637{
638 struct sk_buff *last = qh->tail;
639
640 if (last) {
641 skb->next = NULL;
642 last->next = skb;
643 qh->tail = skb;
644 } else {
645 qh->tail = skb;
646 qh->head = skb;
647 }
648 qh->qlen++;
649 qdisc_qstats_backlog_inc(sch, skb);
650
651 return NET_XMIT_SUCCESS;
652}
653
654static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
655{
656 return __qdisc_enqueue_tail(skb, sch, &sch->q);
657}
658
659static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
660{
661 struct sk_buff *skb = qh->head;
662
663 if (likely(skb != NULL)) {
664 qh->head = skb->next;
665 qh->qlen--;
666 if (qh->head == NULL)
667 qh->tail = NULL;
668 skb->next = NULL;
669 }
670
671 return skb;
672}
673
674static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
675{
676 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
677
678 if (likely(skb != NULL)) {
679 qdisc_qstats_backlog_dec(sch, skb);
680 qdisc_bstats_update(sch, skb);
681 }
682
683 return skb;
684}
685
686
687
688
689static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
690{
691 skb->next = *to_free;
692 *to_free = skb;
693}
694
695static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
696 struct qdisc_skb_head *qh,
697 struct sk_buff **to_free)
698{
699 struct sk_buff *skb = __qdisc_dequeue_head(qh);
700
701 if (likely(skb != NULL)) {
702 unsigned int len = qdisc_pkt_len(skb);
703
704 qdisc_qstats_backlog_dec(sch, skb);
705 __qdisc_drop(skb, to_free);
706 return len;
707 }
708
709 return 0;
710}
711
712static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
713 struct sk_buff **to_free)
714{
715 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
716}
717
718static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
719{
720 const struct qdisc_skb_head *qh = &sch->q;
721
722 return qh->head;
723}
724
725
726static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
727{
728
729 if (!sch->gso_skb) {
730 sch->gso_skb = sch->dequeue(sch);
731 if (sch->gso_skb) {
732
733 qdisc_qstats_backlog_inc(sch, sch->gso_skb);
734 sch->q.qlen++;
735 }
736 }
737
738 return sch->gso_skb;
739}
740
741
742static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
743{
744 struct sk_buff *skb = sch->gso_skb;
745
746 if (skb) {
747 sch->gso_skb = NULL;
748 qdisc_qstats_backlog_dec(sch, skb);
749 sch->q.qlen--;
750 } else {
751 skb = sch->dequeue(sch);
752 }
753
754 return skb;
755}
756
757static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
758{
759
760
761
762
763 ASSERT_RTNL();
764 if (qh->qlen) {
765 rtnl_kfree_skbs(qh->head, qh->tail);
766
767 qh->head = NULL;
768 qh->tail = NULL;
769 qh->qlen = 0;
770 }
771}
772
773static inline void qdisc_reset_queue(struct Qdisc *sch)
774{
775 __qdisc_reset_queue(&sch->q);
776 sch->qstats.backlog = 0;
777}
778
779static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
780 struct Qdisc **pold)
781{
782 struct Qdisc *old;
783
784 sch_tree_lock(sch);
785 old = *pold;
786 *pold = new;
787 if (old != NULL) {
788 qdisc_tree_reduce_backlog(old, old->q.qlen, old->qstats.backlog);
789 qdisc_reset(old);
790 }
791 sch_tree_unlock(sch);
792
793 return old;
794}
795
796static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
797{
798 rtnl_kfree_skbs(skb, skb);
799 qdisc_qstats_drop(sch);
800}
801
802
803static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
804 struct sk_buff **to_free)
805{
806 __qdisc_drop(skb, to_free);
807 qdisc_qstats_drop(sch);
808
809 return NET_XMIT_DROP;
810}
811
812
813
814
815static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
816{
817 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
818 if (slot < 0)
819 slot = 0;
820 slot >>= rtab->rate.cell_log;
821 if (slot > 255)
822 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
823 return rtab->data[slot];
824}
825
826struct psched_ratecfg {
827 u64 rate_bytes_ps;
828 u32 mult;
829 u16 overhead;
830 u8 linklayer;
831 u8 shift;
832};
833
834static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
835 unsigned int len)
836{
837 len += r->overhead;
838
839 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
840 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
841
842 return ((u64)len * r->mult) >> r->shift;
843}
844
845void psched_ratecfg_precompute(struct psched_ratecfg *r,
846 const struct tc_ratespec *conf,
847 u64 rate64);
848
849static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
850 const struct psched_ratecfg *r)
851{
852 memset(res, 0, sizeof(*res));
853
854
855
856
857
858 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
859
860 res->overhead = r->overhead;
861 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
862}
863
864#endif
865