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Merge branch 'sched-tp_q-remove'
[mirror_ubuntu-hirsute-kernel.git] / include / net / sch_generic.h
1 #ifndef __NET_SCHED_GENERIC_H
2 #define __NET_SCHED_GENERIC_H
3
4 #include <linux/netdevice.h>
5 #include <linux/types.h>
6 #include <linux/rcupdate.h>
7 #include <linux/pkt_sched.h>
8 #include <linux/pkt_cls.h>
9 #include <linux/percpu.h>
10 #include <linux/dynamic_queue_limits.h>
11 #include <linux/list.h>
12 #include <linux/refcount.h>
13 #include <net/gen_stats.h>
14 #include <net/rtnetlink.h>
15
16 struct Qdisc_ops;
17 struct qdisc_walker;
18 struct tcf_walker;
19 struct module;
20
21 struct qdisc_rate_table {
22 struct tc_ratespec rate;
23 u32 data[256];
24 struct qdisc_rate_table *next;
25 int refcnt;
26 };
27
28 enum qdisc_state_t {
29 __QDISC_STATE_SCHED,
30 __QDISC_STATE_DEACTIVATED,
31 };
32
33 struct qdisc_size_table {
34 struct rcu_head rcu;
35 struct list_head list;
36 struct tc_sizespec szopts;
37 int refcnt;
38 u16 data[];
39 };
40
41 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
42 struct qdisc_skb_head {
43 struct sk_buff *head;
44 struct sk_buff *tail;
45 __u32 qlen;
46 spinlock_t lock;
47 };
48
49 struct Qdisc {
50 int (*enqueue)(struct sk_buff *skb,
51 struct Qdisc *sch,
52 struct sk_buff **to_free);
53 struct sk_buff * (*dequeue)(struct Qdisc *sch);
54 unsigned int flags;
55 #define TCQ_F_BUILTIN 1
56 #define TCQ_F_INGRESS 2
57 #define TCQ_F_CAN_BYPASS 4
58 #define TCQ_F_MQROOT 8
59 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
60 * q->dev_queue : It can test
61 * netif_xmit_frozen_or_stopped() before
62 * dequeueing next packet.
63 * Its true for MQ/MQPRIO slaves, or non
64 * multiqueue device.
65 */
66 #define TCQ_F_WARN_NONWC (1 << 16)
67 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
68 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
69 * qdisc_tree_decrease_qlen() should stop.
70 */
71 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
72 u32 limit;
73 const struct Qdisc_ops *ops;
74 struct qdisc_size_table __rcu *stab;
75 struct hlist_node hash;
76 u32 handle;
77 u32 parent;
78
79 struct netdev_queue *dev_queue;
80
81 struct net_rate_estimator __rcu *rate_est;
82 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
83 struct gnet_stats_queue __percpu *cpu_qstats;
84
85 /*
86 * For performance sake on SMP, we put highly modified fields at the end
87 */
88 struct sk_buff *gso_skb ____cacheline_aligned_in_smp;
89 struct qdisc_skb_head q;
90 struct gnet_stats_basic_packed bstats;
91 seqcount_t running;
92 struct gnet_stats_queue qstats;
93 unsigned long state;
94 struct Qdisc *next_sched;
95 struct sk_buff *skb_bad_txq;
96 int padded;
97 refcount_t refcnt;
98
99 spinlock_t busylock ____cacheline_aligned_in_smp;
100 };
101
102 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
103 {
104 if (qdisc->flags & TCQ_F_BUILTIN)
105 return;
106 refcount_inc(&qdisc->refcnt);
107 }
108
109 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
110 {
111 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
112 }
113
114 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
115 {
116 if (qdisc_is_running(qdisc))
117 return false;
118 /* Variant of write_seqcount_begin() telling lockdep a trylock
119 * was attempted.
120 */
121 raw_write_seqcount_begin(&qdisc->running);
122 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
123 return true;
124 }
125
126 static inline void qdisc_run_end(struct Qdisc *qdisc)
127 {
128 write_seqcount_end(&qdisc->running);
129 }
130
131 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
132 {
133 return qdisc->flags & TCQ_F_ONETXQUEUE;
134 }
135
136 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
137 {
138 #ifdef CONFIG_BQL
139 /* Non-BQL migrated drivers will return 0, too. */
140 return dql_avail(&txq->dql);
141 #else
142 return 0;
143 #endif
144 }
145
146 struct Qdisc_class_ops {
147 /* Child qdisc manipulation */
148 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
149 int (*graft)(struct Qdisc *, unsigned long cl,
150 struct Qdisc *, struct Qdisc **);
151 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
152 void (*qlen_notify)(struct Qdisc *, unsigned long);
153
154 /* Class manipulation routines */
155 unsigned long (*find)(struct Qdisc *, u32 classid);
156 int (*change)(struct Qdisc *, u32, u32,
157 struct nlattr **, unsigned long *);
158 int (*delete)(struct Qdisc *, unsigned long);
159 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
160
161 /* Filter manipulation */
162 struct tcf_block * (*tcf_block)(struct Qdisc *, unsigned long);
163 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
164 u32 classid);
165 void (*unbind_tcf)(struct Qdisc *, unsigned long);
166
167 /* rtnetlink specific */
168 int (*dump)(struct Qdisc *, unsigned long,
169 struct sk_buff *skb, struct tcmsg*);
170 int (*dump_stats)(struct Qdisc *, unsigned long,
171 struct gnet_dump *);
172 };
173
174 struct Qdisc_ops {
175 struct Qdisc_ops *next;
176 const struct Qdisc_class_ops *cl_ops;
177 char id[IFNAMSIZ];
178 int priv_size;
179
180 int (*enqueue)(struct sk_buff *skb,
181 struct Qdisc *sch,
182 struct sk_buff **to_free);
183 struct sk_buff * (*dequeue)(struct Qdisc *);
184 struct sk_buff * (*peek)(struct Qdisc *);
185
186 int (*init)(struct Qdisc *, struct nlattr *arg);
187 void (*reset)(struct Qdisc *);
188 void (*destroy)(struct Qdisc *);
189 int (*change)(struct Qdisc *, struct nlattr *arg);
190 void (*attach)(struct Qdisc *);
191
192 int (*dump)(struct Qdisc *, struct sk_buff *);
193 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
194
195 struct module *owner;
196 };
197
198
199 struct tcf_result {
200 union {
201 struct {
202 unsigned long class;
203 u32 classid;
204 };
205 const struct tcf_proto *goto_tp;
206 };
207 };
208
209 struct tcf_proto_ops {
210 struct list_head head;
211 char kind[IFNAMSIZ];
212
213 int (*classify)(struct sk_buff *,
214 const struct tcf_proto *,
215 struct tcf_result *);
216 int (*init)(struct tcf_proto*);
217 void (*destroy)(struct tcf_proto*);
218
219 void* (*get)(struct tcf_proto*, u32 handle);
220 int (*change)(struct net *net, struct sk_buff *,
221 struct tcf_proto*, unsigned long,
222 u32 handle, struct nlattr **,
223 void **, bool);
224 int (*delete)(struct tcf_proto*, void *, bool*);
225 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
226 void (*bind_class)(void *, u32, unsigned long);
227
228 /* rtnetlink specific */
229 int (*dump)(struct net*, struct tcf_proto*, void *,
230 struct sk_buff *skb, struct tcmsg*);
231
232 struct module *owner;
233 };
234
235 struct tcf_proto {
236 /* Fast access part */
237 struct tcf_proto __rcu *next;
238 void __rcu *root;
239 int (*classify)(struct sk_buff *,
240 const struct tcf_proto *,
241 struct tcf_result *);
242 __be16 protocol;
243
244 /* All the rest */
245 u32 prio;
246 u32 classid;
247 struct Qdisc *q;
248 void *data;
249 const struct tcf_proto_ops *ops;
250 struct tcf_chain *chain;
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 struct tcf_chain {
263 struct tcf_proto __rcu *filter_chain;
264 struct tcf_proto __rcu **p_filter_chain;
265 struct list_head list;
266 struct tcf_block *block;
267 u32 index; /* chain index */
268 unsigned int refcnt;
269 };
270
271 struct tcf_block {
272 struct list_head chain_list;
273 struct net *net;
274 struct Qdisc *q;
275 };
276
277 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
278 {
279 struct qdisc_skb_cb *qcb;
280
281 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
282 BUILD_BUG_ON(sizeof(qcb->data) < sz);
283 }
284
285 static inline int qdisc_qlen(const struct Qdisc *q)
286 {
287 return q->q.qlen;
288 }
289
290 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
291 {
292 return (struct qdisc_skb_cb *)skb->cb;
293 }
294
295 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
296 {
297 return &qdisc->q.lock;
298 }
299
300 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
301 {
302 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
303
304 return q;
305 }
306
307 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
308 {
309 return qdisc->dev_queue->qdisc_sleeping;
310 }
311
312 /* The qdisc root lock is a mechanism by which to top level
313 * of a qdisc tree can be locked from any qdisc node in the
314 * forest. This allows changing the configuration of some
315 * aspect of the qdisc tree while blocking out asynchronous
316 * qdisc access in the packet processing paths.
317 *
318 * It is only legal to do this when the root will not change
319 * on us. Otherwise we'll potentially lock the wrong qdisc
320 * root. This is enforced by holding the RTNL semaphore, which
321 * all users of this lock accessor must do.
322 */
323 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
324 {
325 struct Qdisc *root = qdisc_root(qdisc);
326
327 ASSERT_RTNL();
328 return qdisc_lock(root);
329 }
330
331 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
332 {
333 struct Qdisc *root = qdisc_root_sleeping(qdisc);
334
335 ASSERT_RTNL();
336 return qdisc_lock(root);
337 }
338
339 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
340 {
341 struct Qdisc *root = qdisc_root_sleeping(qdisc);
342
343 ASSERT_RTNL();
344 return &root->running;
345 }
346
347 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
348 {
349 return qdisc->dev_queue->dev;
350 }
351
352 static inline void sch_tree_lock(const struct Qdisc *q)
353 {
354 spin_lock_bh(qdisc_root_sleeping_lock(q));
355 }
356
357 static inline void sch_tree_unlock(const struct Qdisc *q)
358 {
359 spin_unlock_bh(qdisc_root_sleeping_lock(q));
360 }
361
362 extern struct Qdisc noop_qdisc;
363 extern struct Qdisc_ops noop_qdisc_ops;
364 extern struct Qdisc_ops pfifo_fast_ops;
365 extern struct Qdisc_ops mq_qdisc_ops;
366 extern struct Qdisc_ops noqueue_qdisc_ops;
367 extern const struct Qdisc_ops *default_qdisc_ops;
368 static inline const struct Qdisc_ops *
369 get_default_qdisc_ops(const struct net_device *dev, int ntx)
370 {
371 return ntx < dev->real_num_tx_queues ?
372 default_qdisc_ops : &pfifo_fast_ops;
373 }
374
375 struct Qdisc_class_common {
376 u32 classid;
377 struct hlist_node hnode;
378 };
379
380 struct Qdisc_class_hash {
381 struct hlist_head *hash;
382 unsigned int hashsize;
383 unsigned int hashmask;
384 unsigned int hashelems;
385 };
386
387 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
388 {
389 id ^= id >> 8;
390 id ^= id >> 4;
391 return id & mask;
392 }
393
394 static inline struct Qdisc_class_common *
395 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
396 {
397 struct Qdisc_class_common *cl;
398 unsigned int h;
399
400 if (!id)
401 return NULL;
402
403 h = qdisc_class_hash(id, hash->hashmask);
404 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
405 if (cl->classid == id)
406 return cl;
407 }
408 return NULL;
409 }
410
411 int qdisc_class_hash_init(struct Qdisc_class_hash *);
412 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
413 struct Qdisc_class_common *);
414 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
415 struct Qdisc_class_common *);
416 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
417 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
418
419 void dev_init_scheduler(struct net_device *dev);
420 void dev_shutdown(struct net_device *dev);
421 void dev_activate(struct net_device *dev);
422 void dev_deactivate(struct net_device *dev);
423 void dev_deactivate_many(struct list_head *head);
424 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
425 struct Qdisc *qdisc);
426 void qdisc_reset(struct Qdisc *qdisc);
427 void qdisc_destroy(struct Qdisc *qdisc);
428 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
429 unsigned int len);
430 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
431 const struct Qdisc_ops *ops);
432 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
433 const struct Qdisc_ops *ops, u32 parentid);
434 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
435 const struct qdisc_size_table *stab);
436 int skb_do_redirect(struct sk_buff *);
437
438 static inline void skb_reset_tc(struct sk_buff *skb)
439 {
440 #ifdef CONFIG_NET_CLS_ACT
441 skb->tc_redirected = 0;
442 #endif
443 }
444
445 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
446 {
447 #ifdef CONFIG_NET_CLS_ACT
448 return skb->tc_at_ingress;
449 #else
450 return false;
451 #endif
452 }
453
454 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
455 {
456 #ifdef CONFIG_NET_CLS_ACT
457 if (skb->tc_skip_classify) {
458 skb->tc_skip_classify = 0;
459 return true;
460 }
461 #endif
462 return false;
463 }
464
465 /* Reset all TX qdiscs greater then index of a device. */
466 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
467 {
468 struct Qdisc *qdisc;
469
470 for (; i < dev->num_tx_queues; i++) {
471 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
472 if (qdisc) {
473 spin_lock_bh(qdisc_lock(qdisc));
474 qdisc_reset(qdisc);
475 spin_unlock_bh(qdisc_lock(qdisc));
476 }
477 }
478 }
479
480 static inline void qdisc_reset_all_tx(struct net_device *dev)
481 {
482 qdisc_reset_all_tx_gt(dev, 0);
483 }
484
485 /* Are all TX queues of the device empty? */
486 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
487 {
488 unsigned int i;
489
490 rcu_read_lock();
491 for (i = 0; i < dev->num_tx_queues; i++) {
492 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
493 const struct Qdisc *q = rcu_dereference(txq->qdisc);
494
495 if (q->q.qlen) {
496 rcu_read_unlock();
497 return false;
498 }
499 }
500 rcu_read_unlock();
501 return true;
502 }
503
504 /* Are any of the TX qdiscs changing? */
505 static inline bool qdisc_tx_changing(const struct net_device *dev)
506 {
507 unsigned int i;
508
509 for (i = 0; i < dev->num_tx_queues; i++) {
510 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
511 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
512 return true;
513 }
514 return false;
515 }
516
517 /* Is the device using the noop qdisc on all queues? */
518 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
519 {
520 unsigned int i;
521
522 for (i = 0; i < dev->num_tx_queues; i++) {
523 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
524 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
525 return false;
526 }
527 return true;
528 }
529
530 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
531 {
532 return qdisc_skb_cb(skb)->pkt_len;
533 }
534
535 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
536 enum net_xmit_qdisc_t {
537 __NET_XMIT_STOLEN = 0x00010000,
538 __NET_XMIT_BYPASS = 0x00020000,
539 };
540
541 #ifdef CONFIG_NET_CLS_ACT
542 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
543 #else
544 #define net_xmit_drop_count(e) (1)
545 #endif
546
547 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
548 const struct Qdisc *sch)
549 {
550 #ifdef CONFIG_NET_SCHED
551 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
552
553 if (stab)
554 __qdisc_calculate_pkt_len(skb, stab);
555 #endif
556 }
557
558 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
559 struct sk_buff **to_free)
560 {
561 qdisc_calculate_pkt_len(skb, sch);
562 return sch->enqueue(skb, sch, to_free);
563 }
564
565 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
566 {
567 return q->flags & TCQ_F_CPUSTATS;
568 }
569
570 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
571 __u64 bytes, __u32 packets)
572 {
573 bstats->bytes += bytes;
574 bstats->packets += packets;
575 }
576
577 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
578 const struct sk_buff *skb)
579 {
580 _bstats_update(bstats,
581 qdisc_pkt_len(skb),
582 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
583 }
584
585 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
586 __u64 bytes, __u32 packets)
587 {
588 u64_stats_update_begin(&bstats->syncp);
589 _bstats_update(&bstats->bstats, bytes, packets);
590 u64_stats_update_end(&bstats->syncp);
591 }
592
593 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
594 const struct sk_buff *skb)
595 {
596 u64_stats_update_begin(&bstats->syncp);
597 bstats_update(&bstats->bstats, skb);
598 u64_stats_update_end(&bstats->syncp);
599 }
600
601 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
602 const struct sk_buff *skb)
603 {
604 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
605 }
606
607 static inline void qdisc_bstats_update(struct Qdisc *sch,
608 const struct sk_buff *skb)
609 {
610 bstats_update(&sch->bstats, skb);
611 }
612
613 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
614 const struct sk_buff *skb)
615 {
616 sch->qstats.backlog -= qdisc_pkt_len(skb);
617 }
618
619 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
620 const struct sk_buff *skb)
621 {
622 sch->qstats.backlog += qdisc_pkt_len(skb);
623 }
624
625 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
626 {
627 sch->qstats.drops += count;
628 }
629
630 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
631 {
632 qstats->drops++;
633 }
634
635 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
636 {
637 qstats->overlimits++;
638 }
639
640 static inline void qdisc_qstats_drop(struct Qdisc *sch)
641 {
642 qstats_drop_inc(&sch->qstats);
643 }
644
645 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
646 {
647 this_cpu_inc(sch->cpu_qstats->drops);
648 }
649
650 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
651 {
652 sch->qstats.overlimits++;
653 }
654
655 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
656 {
657 qh->head = NULL;
658 qh->tail = NULL;
659 qh->qlen = 0;
660 }
661
662 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
663 struct qdisc_skb_head *qh)
664 {
665 struct sk_buff *last = qh->tail;
666
667 if (last) {
668 skb->next = NULL;
669 last->next = skb;
670 qh->tail = skb;
671 } else {
672 qh->tail = skb;
673 qh->head = skb;
674 }
675 qh->qlen++;
676 qdisc_qstats_backlog_inc(sch, skb);
677
678 return NET_XMIT_SUCCESS;
679 }
680
681 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
682 {
683 return __qdisc_enqueue_tail(skb, sch, &sch->q);
684 }
685
686 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
687 {
688 struct sk_buff *skb = qh->head;
689
690 if (likely(skb != NULL)) {
691 qh->head = skb->next;
692 qh->qlen--;
693 if (qh->head == NULL)
694 qh->tail = NULL;
695 skb->next = NULL;
696 }
697
698 return skb;
699 }
700
701 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
702 {
703 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
704
705 if (likely(skb != NULL)) {
706 qdisc_qstats_backlog_dec(sch, skb);
707 qdisc_bstats_update(sch, skb);
708 }
709
710 return skb;
711 }
712
713 /* Instead of calling kfree_skb() while root qdisc lock is held,
714 * queue the skb for future freeing at end of __dev_xmit_skb()
715 */
716 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
717 {
718 skb->next = *to_free;
719 *to_free = skb;
720 }
721
722 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
723 struct qdisc_skb_head *qh,
724 struct sk_buff **to_free)
725 {
726 struct sk_buff *skb = __qdisc_dequeue_head(qh);
727
728 if (likely(skb != NULL)) {
729 unsigned int len = qdisc_pkt_len(skb);
730
731 qdisc_qstats_backlog_dec(sch, skb);
732 __qdisc_drop(skb, to_free);
733 return len;
734 }
735
736 return 0;
737 }
738
739 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
740 struct sk_buff **to_free)
741 {
742 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
743 }
744
745 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
746 {
747 const struct qdisc_skb_head *qh = &sch->q;
748
749 return qh->head;
750 }
751
752 /* generic pseudo peek method for non-work-conserving qdisc */
753 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
754 {
755 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
756 if (!sch->gso_skb) {
757 sch->gso_skb = sch->dequeue(sch);
758 if (sch->gso_skb) {
759 /* it's still part of the queue */
760 qdisc_qstats_backlog_inc(sch, sch->gso_skb);
761 sch->q.qlen++;
762 }
763 }
764
765 return sch->gso_skb;
766 }
767
768 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
769 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
770 {
771 struct sk_buff *skb = sch->gso_skb;
772
773 if (skb) {
774 sch->gso_skb = NULL;
775 qdisc_qstats_backlog_dec(sch, skb);
776 sch->q.qlen--;
777 } else {
778 skb = sch->dequeue(sch);
779 }
780
781 return skb;
782 }
783
784 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
785 {
786 /*
787 * We do not know the backlog in bytes of this list, it
788 * is up to the caller to correct it
789 */
790 ASSERT_RTNL();
791 if (qh->qlen) {
792 rtnl_kfree_skbs(qh->head, qh->tail);
793
794 qh->head = NULL;
795 qh->tail = NULL;
796 qh->qlen = 0;
797 }
798 }
799
800 static inline void qdisc_reset_queue(struct Qdisc *sch)
801 {
802 __qdisc_reset_queue(&sch->q);
803 sch->qstats.backlog = 0;
804 }
805
806 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
807 struct Qdisc **pold)
808 {
809 struct Qdisc *old;
810
811 sch_tree_lock(sch);
812 old = *pold;
813 *pold = new;
814 if (old != NULL) {
815 unsigned int qlen = old->q.qlen;
816 unsigned int backlog = old->qstats.backlog;
817
818 qdisc_reset(old);
819 qdisc_tree_reduce_backlog(old, qlen, backlog);
820 }
821 sch_tree_unlock(sch);
822
823 return old;
824 }
825
826 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
827 {
828 rtnl_kfree_skbs(skb, skb);
829 qdisc_qstats_drop(sch);
830 }
831
832
833 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
834 struct sk_buff **to_free)
835 {
836 __qdisc_drop(skb, to_free);
837 qdisc_qstats_drop(sch);
838
839 return NET_XMIT_DROP;
840 }
841
842 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
843 long it will take to send a packet given its size.
844 */
845 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
846 {
847 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
848 if (slot < 0)
849 slot = 0;
850 slot >>= rtab->rate.cell_log;
851 if (slot > 255)
852 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
853 return rtab->data[slot];
854 }
855
856 struct psched_ratecfg {
857 u64 rate_bytes_ps; /* bytes per second */
858 u32 mult;
859 u16 overhead;
860 u8 linklayer;
861 u8 shift;
862 };
863
864 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
865 unsigned int len)
866 {
867 len += r->overhead;
868
869 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
870 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
871
872 return ((u64)len * r->mult) >> r->shift;
873 }
874
875 void psched_ratecfg_precompute(struct psched_ratecfg *r,
876 const struct tc_ratespec *conf,
877 u64 rate64);
878
879 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
880 const struct psched_ratecfg *r)
881 {
882 memset(res, 0, sizeof(*res));
883
884 /* legacy struct tc_ratespec has a 32bit @rate field
885 * Qdisc using 64bit rate should add new attributes
886 * in order to maintain compatibility.
887 */
888 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
889
890 res->overhead = r->overhead;
891 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
892 }
893
894 #endif
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