Loading...
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 __QDISC_STATE_THROTTLED,
30};
31
32/*
33 * following bits are only changed while qdisc lock is held
34 */
35enum qdisc___state_t {
36 __QDISC___STATE_RUNNING = 1,
37};
38
39struct 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
47struct 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
105static inline bool qdisc_is_running(const struct Qdisc *qdisc)
106{
107 return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
108}
109
110static 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
118static inline void qdisc_run_end(struct Qdisc *qdisc)
119{
120 qdisc->__state &= ~__QDISC___STATE_RUNNING;
121}
122
123static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
124{
125 return qdisc->flags & TCQ_F_ONETXQUEUE;
126}
127
128static 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
138static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
139{
140 return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
141}
142
143static inline void qdisc_throttled(struct Qdisc *qdisc)
144{
145 set_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
146}
147
148static inline void qdisc_unthrottled(struct Qdisc *qdisc)
149{
150 clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
151}
152
153struct 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
182struct 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
206struct tcf_result {
207 unsigned long class;
208 u32 classid;
209};
210
211struct 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
236struct 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
254struct 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
262static 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
270static inline int qdisc_qlen(const struct Qdisc *q)
271{
272 return q->q.qlen;
273}
274
275static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
276{
277 return (struct qdisc_skb_cb *)skb->cb;
278}
279
280static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
281{
282 return &qdisc->q.lock;
283}
284
285static 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
292static 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 */
308static 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
316static 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
324static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
325{
326 return qdisc->dev_queue->dev;
327}
328
329static inline void sch_tree_lock(const struct Qdisc *q)
330{
331 spin_lock_bh(qdisc_root_sleeping_lock(q));
332}
333
334static 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
342extern struct Qdisc noop_qdisc;
343extern struct Qdisc_ops noop_qdisc_ops;
344extern struct Qdisc_ops pfifo_fast_ops;
345extern struct Qdisc_ops mq_qdisc_ops;
346extern struct Qdisc_ops noqueue_qdisc_ops;
347extern const struct Qdisc_ops *default_qdisc_ops;
348static inline const struct Qdisc_ops *
349get_default_qdisc_ops(const struct net_device *dev, int ntx)
350{
351 return ntx < dev->real_num_tx_queues ?
352 default_qdisc_ops : &pfifo_fast_ops;
353}
354
355struct Qdisc_class_common {
356 u32 classid;
357 struct hlist_node hnode;
358};
359
360struct Qdisc_class_hash {
361 struct hlist_head *hash;
362 unsigned int hashsize;
363 unsigned int hashmask;
364 unsigned int hashelems;
365};
366
367static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
368{
369 id ^= id >> 8;
370 id ^= id >> 4;
371 return id & mask;
372}
373
374static inline struct Qdisc_class_common *
375qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
376{
377 struct Qdisc_class_common *cl;
378 unsigned int h;
379
380 h = qdisc_class_hash(id, hash->hashmask);
381 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
382 if (cl->classid == id)
383 return cl;
384 }
385 return NULL;
386}
387
388int qdisc_class_hash_init(struct Qdisc_class_hash *);
389void qdisc_class_hash_insert(struct Qdisc_class_hash *,
390 struct Qdisc_class_common *);
391void qdisc_class_hash_remove(struct Qdisc_class_hash *,
392 struct Qdisc_class_common *);
393void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
394void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
395
396void dev_init_scheduler(struct net_device *dev);
397void dev_shutdown(struct net_device *dev);
398void dev_activate(struct net_device *dev);
399void dev_deactivate(struct net_device *dev);
400void dev_deactivate_many(struct list_head *head);
401struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
402 struct Qdisc *qdisc);
403void qdisc_reset(struct Qdisc *qdisc);
404void qdisc_destroy(struct Qdisc *qdisc);
405void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
406 unsigned int len);
407struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
408 const struct Qdisc_ops *ops);
409struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
410 const struct Qdisc_ops *ops, u32 parentid);
411void __qdisc_calculate_pkt_len(struct sk_buff *skb,
412 const struct qdisc_size_table *stab);
413bool tcf_destroy(struct tcf_proto *tp, bool force);
414void tcf_destroy_chain(struct tcf_proto __rcu **fl);
415int skb_do_redirect(struct sk_buff *);
416
417static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
418{
419#ifdef CONFIG_NET_CLS_ACT
420 return G_TC_AT(skb->tc_verd) & AT_INGRESS;
421#else
422 return false;
423#endif
424}
425
426/* Reset all TX qdiscs greater then index of a device. */
427static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
428{
429 struct Qdisc *qdisc;
430
431 for (; i < dev->num_tx_queues; i++) {
432 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
433 if (qdisc) {
434 spin_lock_bh(qdisc_lock(qdisc));
435 qdisc_reset(qdisc);
436 spin_unlock_bh(qdisc_lock(qdisc));
437 }
438 }
439}
440
441static inline void qdisc_reset_all_tx(struct net_device *dev)
442{
443 qdisc_reset_all_tx_gt(dev, 0);
444}
445
446/* Are all TX queues of the device empty? */
447static inline bool qdisc_all_tx_empty(const struct net_device *dev)
448{
449 unsigned int i;
450
451 rcu_read_lock();
452 for (i = 0; i < dev->num_tx_queues; i++) {
453 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
454 const struct Qdisc *q = rcu_dereference(txq->qdisc);
455
456 if (q->q.qlen) {
457 rcu_read_unlock();
458 return false;
459 }
460 }
461 rcu_read_unlock();
462 return true;
463}
464
465/* Are any of the TX qdiscs changing? */
466static inline bool qdisc_tx_changing(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) != txq->qdisc_sleeping)
473 return true;
474 }
475 return false;
476}
477
478/* Is the device using the noop qdisc on all queues? */
479static inline bool qdisc_tx_is_noop(const struct net_device *dev)
480{
481 unsigned int i;
482
483 for (i = 0; i < dev->num_tx_queues; i++) {
484 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
485 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
486 return false;
487 }
488 return true;
489}
490
491static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
492{
493 return qdisc_skb_cb(skb)->pkt_len;
494}
495
496/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
497enum net_xmit_qdisc_t {
498 __NET_XMIT_STOLEN = 0x00010000,
499 __NET_XMIT_BYPASS = 0x00020000,
500};
501
502#ifdef CONFIG_NET_CLS_ACT
503#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
504#else
505#define net_xmit_drop_count(e) (1)
506#endif
507
508static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
509 const struct Qdisc *sch)
510{
511#ifdef CONFIG_NET_SCHED
512 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
513
514 if (stab)
515 __qdisc_calculate_pkt_len(skb, stab);
516#endif
517}
518
519static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
520{
521 qdisc_calculate_pkt_len(skb, sch);
522 return sch->enqueue(skb, sch);
523}
524
525static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
526{
527 return q->flags & TCQ_F_CPUSTATS;
528}
529
530static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
531 const struct sk_buff *skb)
532{
533 bstats->bytes += qdisc_pkt_len(skb);
534 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
535}
536
537static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
538 const struct sk_buff *skb)
539{
540 u64_stats_update_begin(&bstats->syncp);
541 bstats_update(&bstats->bstats, skb);
542 u64_stats_update_end(&bstats->syncp);
543}
544
545static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
546 const struct sk_buff *skb)
547{
548 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
549}
550
551static inline void qdisc_bstats_update(struct Qdisc *sch,
552 const struct sk_buff *skb)
553{
554 bstats_update(&sch->bstats, skb);
555}
556
557static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
558 const struct sk_buff *skb)
559{
560 sch->qstats.backlog -= qdisc_pkt_len(skb);
561}
562
563static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
564 const struct sk_buff *skb)
565{
566 sch->qstats.backlog += qdisc_pkt_len(skb);
567}
568
569static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
570{
571 sch->qstats.drops += count;
572}
573
574static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
575{
576 qstats->drops++;
577}
578
579static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
580{
581 qstats->overlimits++;
582}
583
584static inline void qdisc_qstats_drop(struct Qdisc *sch)
585{
586 qstats_drop_inc(&sch->qstats);
587}
588
589static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
590{
591 qstats_drop_inc(this_cpu_ptr(sch->cpu_qstats));
592}
593
594static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
595{
596 sch->qstats.overlimits++;
597}
598
599static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
600 struct sk_buff_head *list)
601{
602 __skb_queue_tail(list, skb);
603 qdisc_qstats_backlog_inc(sch, skb);
604
605 return NET_XMIT_SUCCESS;
606}
607
608static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
609{
610 return __qdisc_enqueue_tail(skb, sch, &sch->q);
611}
612
613static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
614 struct sk_buff_head *list)
615{
616 struct sk_buff *skb = __skb_dequeue(list);
617
618 if (likely(skb != NULL)) {
619 qdisc_qstats_backlog_dec(sch, skb);
620 qdisc_bstats_update(sch, skb);
621 }
622
623 return skb;
624}
625
626static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
627{
628 return __qdisc_dequeue_head(sch, &sch->q);
629}
630
631static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
632 struct sk_buff_head *list)
633{
634 struct sk_buff *skb = __skb_dequeue(list);
635
636 if (likely(skb != NULL)) {
637 unsigned int len = qdisc_pkt_len(skb);
638 qdisc_qstats_backlog_dec(sch, skb);
639 kfree_skb(skb);
640 return len;
641 }
642
643 return 0;
644}
645
646static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
647{
648 return __qdisc_queue_drop_head(sch, &sch->q);
649}
650
651static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
652 struct sk_buff_head *list)
653{
654 struct sk_buff *skb = __skb_dequeue_tail(list);
655
656 if (likely(skb != NULL))
657 qdisc_qstats_backlog_dec(sch, skb);
658
659 return skb;
660}
661
662static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
663{
664 return __qdisc_dequeue_tail(sch, &sch->q);
665}
666
667static 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 */
673static 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 sch->q.qlen++;
681 }
682
683 return sch->gso_skb;
684}
685
686/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
687static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
688{
689 struct sk_buff *skb = sch->gso_skb;
690
691 if (skb) {
692 sch->gso_skb = NULL;
693 sch->q.qlen--;
694 } else {
695 skb = sch->dequeue(sch);
696 }
697
698 return skb;
699}
700
701static inline void __qdisc_reset_queue(struct Qdisc *sch,
702 struct sk_buff_head *list)
703{
704 /*
705 * We do not know the backlog in bytes of this list, it
706 * is up to the caller to correct it
707 */
708 __skb_queue_purge(list);
709}
710
711static inline void qdisc_reset_queue(struct Qdisc *sch)
712{
713 __qdisc_reset_queue(sch, &sch->q);
714 sch->qstats.backlog = 0;
715}
716
717static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
718 struct Qdisc **pold)
719{
720 struct Qdisc *old;
721
722 sch_tree_lock(sch);
723 old = *pold;
724 *pold = new;
725 if (old != NULL) {
726 qdisc_tree_reduce_backlog(old, old->q.qlen, old->qstats.backlog);
727 qdisc_reset(old);
728 }
729 sch_tree_unlock(sch);
730
731 return old;
732}
733
734static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
735 struct sk_buff_head *list)
736{
737 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
738
739 if (likely(skb != NULL)) {
740 unsigned int len = qdisc_pkt_len(skb);
741 kfree_skb(skb);
742 return len;
743 }
744
745 return 0;
746}
747
748static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
749{
750 return __qdisc_queue_drop(sch, &sch->q);
751}
752
753static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
754{
755 kfree_skb(skb);
756 qdisc_qstats_drop(sch);
757
758 return NET_XMIT_DROP;
759}
760
761static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
762{
763 qdisc_qstats_drop(sch);
764
765#ifdef CONFIG_NET_CLS_ACT
766 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
767 goto drop;
768
769 return NET_XMIT_SUCCESS;
770
771drop:
772#endif
773 kfree_skb(skb);
774 return NET_XMIT_DROP;
775}
776
777/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
778 long it will take to send a packet given its size.
779 */
780static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
781{
782 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
783 if (slot < 0)
784 slot = 0;
785 slot >>= rtab->rate.cell_log;
786 if (slot > 255)
787 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
788 return rtab->data[slot];
789}
790
791struct psched_ratecfg {
792 u64 rate_bytes_ps; /* bytes per second */
793 u32 mult;
794 u16 overhead;
795 u8 linklayer;
796 u8 shift;
797};
798
799static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
800 unsigned int len)
801{
802 len += r->overhead;
803
804 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
805 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
806
807 return ((u64)len * r->mult) >> r->shift;
808}
809
810void psched_ratecfg_precompute(struct psched_ratecfg *r,
811 const struct tc_ratespec *conf,
812 u64 rate64);
813
814static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
815 const struct psched_ratecfg *r)
816{
817 memset(res, 0, sizeof(*res));
818
819 /* legacy struct tc_ratespec has a 32bit @rate field
820 * Qdisc using 64bit rate should add new attributes
821 * in order to maintain compatibility.
822 */
823 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
824
825 res->overhead = r->overhead;
826 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
827}
828
829#endif
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 <net/gen_stats.h>
10#include <net/rtnetlink.h>
11
12struct Qdisc_ops;
13struct qdisc_walker;
14struct tcf_walker;
15struct module;
16
17struct qdisc_rate_table {
18 struct tc_ratespec rate;
19 u32 data[256];
20 struct qdisc_rate_table *next;
21 int refcnt;
22};
23
24enum qdisc_state_t {
25 __QDISC_STATE_SCHED,
26 __QDISC_STATE_DEACTIVATED,
27 __QDISC_STATE_THROTTLED,
28};
29
30/*
31 * following bits are only changed while qdisc lock is held
32 */
33enum qdisc___state_t {
34 __QDISC___STATE_RUNNING = 1,
35};
36
37struct qdisc_size_table {
38 struct rcu_head rcu;
39 struct list_head list;
40 struct tc_sizespec szopts;
41 int refcnt;
42 u16 data[];
43};
44
45struct Qdisc {
46 int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
47 struct sk_buff * (*dequeue)(struct Qdisc *dev);
48 unsigned int flags;
49#define TCQ_F_BUILTIN 1
50#define TCQ_F_INGRESS 2
51#define TCQ_F_CAN_BYPASS 4
52#define TCQ_F_MQROOT 8
53#define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
54 * q->dev_queue : It can test
55 * netif_xmit_frozen_or_stopped() before
56 * dequeueing next packet.
57 * Its true for MQ/MQPRIO slaves, or non
58 * multiqueue device.
59 */
60#define TCQ_F_WARN_NONWC (1 << 16)
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 int (*reshape_fail)(struct sk_buff *skb,
68 struct Qdisc *q);
69
70 void *u32_node;
71
72 /* This field is deprecated, but it is still used by CBQ
73 * and it will live until better solution will be invented.
74 */
75 struct Qdisc *__parent;
76 struct netdev_queue *dev_queue;
77
78 struct gnet_stats_rate_est64 rate_est;
79 struct Qdisc *next_sched;
80 struct sk_buff *gso_skb;
81 /*
82 * For performance sake on SMP, we put highly modified fields at the end
83 */
84 unsigned long state;
85 struct sk_buff_head q;
86 struct gnet_stats_basic_packed bstats;
87 unsigned int __state;
88 struct gnet_stats_queue qstats;
89 struct rcu_head rcu_head;
90 int padded;
91 atomic_t refcnt;
92
93 spinlock_t busylock ____cacheline_aligned_in_smp;
94};
95
96static inline bool qdisc_is_running(const struct Qdisc *qdisc)
97{
98 return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
99}
100
101static inline bool qdisc_run_begin(struct Qdisc *qdisc)
102{
103 if (qdisc_is_running(qdisc))
104 return false;
105 qdisc->__state |= __QDISC___STATE_RUNNING;
106 return true;
107}
108
109static inline void qdisc_run_end(struct Qdisc *qdisc)
110{
111 qdisc->__state &= ~__QDISC___STATE_RUNNING;
112}
113
114static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
115{
116 return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
117}
118
119static inline void qdisc_throttled(struct Qdisc *qdisc)
120{
121 set_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
122}
123
124static inline void qdisc_unthrottled(struct Qdisc *qdisc)
125{
126 clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
127}
128
129struct Qdisc_class_ops {
130 /* Child qdisc manipulation */
131 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
132 int (*graft)(struct Qdisc *, unsigned long cl,
133 struct Qdisc *, struct Qdisc **);
134 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
135 void (*qlen_notify)(struct Qdisc *, unsigned long);
136
137 /* Class manipulation routines */
138 unsigned long (*get)(struct Qdisc *, u32 classid);
139 void (*put)(struct Qdisc *, unsigned long);
140 int (*change)(struct Qdisc *, u32, u32,
141 struct nlattr **, unsigned long *);
142 int (*delete)(struct Qdisc *, unsigned long);
143 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
144
145 /* Filter manipulation */
146 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
147 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
148 u32 classid);
149 void (*unbind_tcf)(struct Qdisc *, unsigned long);
150
151 /* rtnetlink specific */
152 int (*dump)(struct Qdisc *, unsigned long,
153 struct sk_buff *skb, struct tcmsg*);
154 int (*dump_stats)(struct Qdisc *, unsigned long,
155 struct gnet_dump *);
156};
157
158struct Qdisc_ops {
159 struct Qdisc_ops *next;
160 const struct Qdisc_class_ops *cl_ops;
161 char id[IFNAMSIZ];
162 int priv_size;
163
164 int (*enqueue)(struct sk_buff *, struct Qdisc *);
165 struct sk_buff * (*dequeue)(struct Qdisc *);
166 struct sk_buff * (*peek)(struct Qdisc *);
167 unsigned int (*drop)(struct Qdisc *);
168
169 int (*init)(struct Qdisc *, struct nlattr *arg);
170 void (*reset)(struct Qdisc *);
171 void (*destroy)(struct Qdisc *);
172 int (*change)(struct Qdisc *, struct nlattr *arg);
173 void (*attach)(struct Qdisc *);
174
175 int (*dump)(struct Qdisc *, struct sk_buff *);
176 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
177
178 struct module *owner;
179};
180
181
182struct tcf_result {
183 unsigned long class;
184 u32 classid;
185};
186
187struct tcf_proto_ops {
188 struct list_head head;
189 char kind[IFNAMSIZ];
190
191 int (*classify)(struct sk_buff *,
192 const struct tcf_proto *,
193 struct tcf_result *);
194 int (*init)(struct tcf_proto*);
195 void (*destroy)(struct tcf_proto*);
196
197 unsigned long (*get)(struct tcf_proto*, u32 handle);
198 void (*put)(struct tcf_proto*, unsigned long);
199 int (*change)(struct net *net, struct sk_buff *,
200 struct tcf_proto*, unsigned long,
201 u32 handle, struct nlattr **,
202 unsigned long *);
203 int (*delete)(struct tcf_proto*, unsigned long);
204 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
205
206 /* rtnetlink specific */
207 int (*dump)(struct net*, struct tcf_proto*, unsigned long,
208 struct sk_buff *skb, struct tcmsg*);
209
210 struct module *owner;
211};
212
213struct tcf_proto {
214 /* Fast access part */
215 struct tcf_proto *next;
216 void *root;
217 int (*classify)(struct sk_buff *,
218 const struct tcf_proto *,
219 struct tcf_result *);
220 __be16 protocol;
221
222 /* All the rest */
223 u32 prio;
224 u32 classid;
225 struct Qdisc *q;
226 void *data;
227 const struct tcf_proto_ops *ops;
228};
229
230struct qdisc_skb_cb {
231 unsigned int pkt_len;
232 u16 slave_dev_queue_mapping;
233 u16 _pad;
234 unsigned char data[20];
235};
236
237static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
238{
239 struct qdisc_skb_cb *qcb;
240
241 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
242 BUILD_BUG_ON(sizeof(qcb->data) < sz);
243}
244
245static inline int qdisc_qlen(const struct Qdisc *q)
246{
247 return q->q.qlen;
248}
249
250static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
251{
252 return (struct qdisc_skb_cb *)skb->cb;
253}
254
255static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
256{
257 return &qdisc->q.lock;
258}
259
260static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
261{
262 return qdisc->dev_queue->qdisc;
263}
264
265static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
266{
267 return qdisc->dev_queue->qdisc_sleeping;
268}
269
270/* The qdisc root lock is a mechanism by which to top level
271 * of a qdisc tree can be locked from any qdisc node in the
272 * forest. This allows changing the configuration of some
273 * aspect of the qdisc tree while blocking out asynchronous
274 * qdisc access in the packet processing paths.
275 *
276 * It is only legal to do this when the root will not change
277 * on us. Otherwise we'll potentially lock the wrong qdisc
278 * root. This is enforced by holding the RTNL semaphore, which
279 * all users of this lock accessor must do.
280 */
281static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
282{
283 struct Qdisc *root = qdisc_root(qdisc);
284
285 ASSERT_RTNL();
286 return qdisc_lock(root);
287}
288
289static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
290{
291 struct Qdisc *root = qdisc_root_sleeping(qdisc);
292
293 ASSERT_RTNL();
294 return qdisc_lock(root);
295}
296
297static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
298{
299 return qdisc->dev_queue->dev;
300}
301
302static inline void sch_tree_lock(const struct Qdisc *q)
303{
304 spin_lock_bh(qdisc_root_sleeping_lock(q));
305}
306
307static inline void sch_tree_unlock(const struct Qdisc *q)
308{
309 spin_unlock_bh(qdisc_root_sleeping_lock(q));
310}
311
312#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
313#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
314
315extern struct Qdisc noop_qdisc;
316extern struct Qdisc_ops noop_qdisc_ops;
317extern struct Qdisc_ops pfifo_fast_ops;
318extern struct Qdisc_ops mq_qdisc_ops;
319extern const struct Qdisc_ops *default_qdisc_ops;
320
321struct Qdisc_class_common {
322 u32 classid;
323 struct hlist_node hnode;
324};
325
326struct Qdisc_class_hash {
327 struct hlist_head *hash;
328 unsigned int hashsize;
329 unsigned int hashmask;
330 unsigned int hashelems;
331};
332
333static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
334{
335 id ^= id >> 8;
336 id ^= id >> 4;
337 return id & mask;
338}
339
340static inline struct Qdisc_class_common *
341qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
342{
343 struct Qdisc_class_common *cl;
344 unsigned int h;
345
346 h = qdisc_class_hash(id, hash->hashmask);
347 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
348 if (cl->classid == id)
349 return cl;
350 }
351 return NULL;
352}
353
354int qdisc_class_hash_init(struct Qdisc_class_hash *);
355void qdisc_class_hash_insert(struct Qdisc_class_hash *,
356 struct Qdisc_class_common *);
357void qdisc_class_hash_remove(struct Qdisc_class_hash *,
358 struct Qdisc_class_common *);
359void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
360void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
361
362void dev_init_scheduler(struct net_device *dev);
363void dev_shutdown(struct net_device *dev);
364void dev_activate(struct net_device *dev);
365void dev_deactivate(struct net_device *dev);
366void dev_deactivate_many(struct list_head *head);
367struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
368 struct Qdisc *qdisc);
369void qdisc_reset(struct Qdisc *qdisc);
370void qdisc_destroy(struct Qdisc *qdisc);
371void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
372struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
373 const struct Qdisc_ops *ops);
374struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
375 const struct Qdisc_ops *ops, u32 parentid);
376void __qdisc_calculate_pkt_len(struct sk_buff *skb,
377 const struct qdisc_size_table *stab);
378void tcf_destroy(struct tcf_proto *tp);
379void tcf_destroy_chain(struct tcf_proto **fl);
380
381/* Reset all TX qdiscs greater then index of a device. */
382static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
383{
384 struct Qdisc *qdisc;
385
386 for (; i < dev->num_tx_queues; i++) {
387 qdisc = netdev_get_tx_queue(dev, i)->qdisc;
388 if (qdisc) {
389 spin_lock_bh(qdisc_lock(qdisc));
390 qdisc_reset(qdisc);
391 spin_unlock_bh(qdisc_lock(qdisc));
392 }
393 }
394}
395
396static inline void qdisc_reset_all_tx(struct net_device *dev)
397{
398 qdisc_reset_all_tx_gt(dev, 0);
399}
400
401/* Are all TX queues of the device empty? */
402static inline bool qdisc_all_tx_empty(const struct net_device *dev)
403{
404 unsigned int i;
405 for (i = 0; i < dev->num_tx_queues; i++) {
406 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
407 const struct Qdisc *q = txq->qdisc;
408
409 if (q->q.qlen)
410 return false;
411 }
412 return true;
413}
414
415/* Are any of the TX qdiscs changing? */
416static inline bool qdisc_tx_changing(const struct net_device *dev)
417{
418 unsigned int i;
419 for (i = 0; i < dev->num_tx_queues; i++) {
420 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
421 if (txq->qdisc != txq->qdisc_sleeping)
422 return true;
423 }
424 return false;
425}
426
427/* Is the device using the noop qdisc on all queues? */
428static inline bool qdisc_tx_is_noop(const struct net_device *dev)
429{
430 unsigned int i;
431 for (i = 0; i < dev->num_tx_queues; i++) {
432 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
433 if (txq->qdisc != &noop_qdisc)
434 return false;
435 }
436 return true;
437}
438
439static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
440{
441 return qdisc_skb_cb(skb)->pkt_len;
442}
443
444/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
445enum net_xmit_qdisc_t {
446 __NET_XMIT_STOLEN = 0x00010000,
447 __NET_XMIT_BYPASS = 0x00020000,
448};
449
450#ifdef CONFIG_NET_CLS_ACT
451#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
452#else
453#define net_xmit_drop_count(e) (1)
454#endif
455
456static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
457 const struct Qdisc *sch)
458{
459#ifdef CONFIG_NET_SCHED
460 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
461
462 if (stab)
463 __qdisc_calculate_pkt_len(skb, stab);
464#endif
465}
466
467static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
468{
469 qdisc_calculate_pkt_len(skb, sch);
470 return sch->enqueue(skb, sch);
471}
472
473static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
474{
475 qdisc_skb_cb(skb)->pkt_len = skb->len;
476 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
477}
478
479
480static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
481 const struct sk_buff *skb)
482{
483 bstats->bytes += qdisc_pkt_len(skb);
484 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
485}
486
487static inline void qdisc_bstats_update(struct Qdisc *sch,
488 const struct sk_buff *skb)
489{
490 bstats_update(&sch->bstats, skb);
491}
492
493static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
494 struct sk_buff_head *list)
495{
496 __skb_queue_tail(list, skb);
497 sch->qstats.backlog += qdisc_pkt_len(skb);
498
499 return NET_XMIT_SUCCESS;
500}
501
502static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
503{
504 return __qdisc_enqueue_tail(skb, sch, &sch->q);
505}
506
507static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
508 struct sk_buff_head *list)
509{
510 struct sk_buff *skb = __skb_dequeue(list);
511
512 if (likely(skb != NULL)) {
513 sch->qstats.backlog -= qdisc_pkt_len(skb);
514 qdisc_bstats_update(sch, skb);
515 }
516
517 return skb;
518}
519
520static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
521{
522 return __qdisc_dequeue_head(sch, &sch->q);
523}
524
525static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
526 struct sk_buff_head *list)
527{
528 struct sk_buff *skb = __skb_dequeue(list);
529
530 if (likely(skb != NULL)) {
531 unsigned int len = qdisc_pkt_len(skb);
532 sch->qstats.backlog -= len;
533 kfree_skb(skb);
534 return len;
535 }
536
537 return 0;
538}
539
540static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
541{
542 return __qdisc_queue_drop_head(sch, &sch->q);
543}
544
545static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
546 struct sk_buff_head *list)
547{
548 struct sk_buff *skb = __skb_dequeue_tail(list);
549
550 if (likely(skb != NULL))
551 sch->qstats.backlog -= qdisc_pkt_len(skb);
552
553 return skb;
554}
555
556static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
557{
558 return __qdisc_dequeue_tail(sch, &sch->q);
559}
560
561static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
562{
563 return skb_peek(&sch->q);
564}
565
566/* generic pseudo peek method for non-work-conserving qdisc */
567static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
568{
569 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
570 if (!sch->gso_skb) {
571 sch->gso_skb = sch->dequeue(sch);
572 if (sch->gso_skb)
573 /* it's still part of the queue */
574 sch->q.qlen++;
575 }
576
577 return sch->gso_skb;
578}
579
580/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
581static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
582{
583 struct sk_buff *skb = sch->gso_skb;
584
585 if (skb) {
586 sch->gso_skb = NULL;
587 sch->q.qlen--;
588 } else {
589 skb = sch->dequeue(sch);
590 }
591
592 return skb;
593}
594
595static inline void __qdisc_reset_queue(struct Qdisc *sch,
596 struct sk_buff_head *list)
597{
598 /*
599 * We do not know the backlog in bytes of this list, it
600 * is up to the caller to correct it
601 */
602 __skb_queue_purge(list);
603}
604
605static inline void qdisc_reset_queue(struct Qdisc *sch)
606{
607 __qdisc_reset_queue(sch, &sch->q);
608 sch->qstats.backlog = 0;
609}
610
611static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
612 struct sk_buff_head *list)
613{
614 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
615
616 if (likely(skb != NULL)) {
617 unsigned int len = qdisc_pkt_len(skb);
618 kfree_skb(skb);
619 return len;
620 }
621
622 return 0;
623}
624
625static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
626{
627 return __qdisc_queue_drop(sch, &sch->q);
628}
629
630static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
631{
632 kfree_skb(skb);
633 sch->qstats.drops++;
634
635 return NET_XMIT_DROP;
636}
637
638static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
639{
640 sch->qstats.drops++;
641
642#ifdef CONFIG_NET_CLS_ACT
643 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
644 goto drop;
645
646 return NET_XMIT_SUCCESS;
647
648drop:
649#endif
650 kfree_skb(skb);
651 return NET_XMIT_DROP;
652}
653
654/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
655 long it will take to send a packet given its size.
656 */
657static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
658{
659 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
660 if (slot < 0)
661 slot = 0;
662 slot >>= rtab->rate.cell_log;
663 if (slot > 255)
664 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
665 return rtab->data[slot];
666}
667
668#ifdef CONFIG_NET_CLS_ACT
669static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
670 int action)
671{
672 struct sk_buff *n;
673
674 n = skb_clone(skb, gfp_mask);
675
676 if (n) {
677 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
678 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
679 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
680 }
681 return n;
682}
683#endif
684
685struct psched_ratecfg {
686 u64 rate_bytes_ps; /* bytes per second */
687 u32 mult;
688 u16 overhead;
689 u8 linklayer;
690 u8 shift;
691};
692
693static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
694 unsigned int len)
695{
696 len += r->overhead;
697
698 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
699 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
700
701 return ((u64)len * r->mult) >> r->shift;
702}
703
704void psched_ratecfg_precompute(struct psched_ratecfg *r,
705 const struct tc_ratespec *conf,
706 u64 rate64);
707
708static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
709 const struct psched_ratecfg *r)
710{
711 memset(res, 0, sizeof(*res));
712
713 /* legacy struct tc_ratespec has a 32bit @rate field
714 * Qdisc using 64bit rate should add new attributes
715 * in order to maintain compatibility.
716 */
717 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
718
719 res->overhead = r->overhead;
720 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
721}
722
723#endif