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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 <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/* similar to sk_buff_head, but skb->prev pointer is undefined. */
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 /* dequeue_skb() can assume all skbs are for
58 * q->dev_queue : It can test
59 * netif_xmit_frozen_or_stopped() before
60 * dequeueing next packet.
61 * Its true for MQ/MQPRIO slaves, or non
62 * multiqueue device.
63 */
64#define TCQ_F_WARN_NONWC (1 << 16)
65#define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
66#define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
67 * qdisc_tree_decrease_qlen() should stop.
68 */
69 u32 limit;
70 const struct Qdisc_ops *ops;
71 struct qdisc_size_table __rcu *stab;
72 struct hlist_node hash;
73 u32 handle;
74 u32 parent;
75 void *u32_node;
76
77 struct netdev_queue *dev_queue;
78
79 struct net_rate_estimator __rcu *rate_est;
80 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
81 struct gnet_stats_queue __percpu *cpu_qstats;
82
83 /*
84 * For performance sake on SMP, we put highly modified fields at the end
85 */
86 struct sk_buff *gso_skb ____cacheline_aligned_in_smp;
87 struct qdisc_skb_head q;
88 struct gnet_stats_basic_packed bstats;
89 seqcount_t running;
90 struct gnet_stats_queue qstats;
91 unsigned long state;
92 struct Qdisc *next_sched;
93 struct sk_buff *skb_bad_txq;
94 struct rcu_head rcu_head;
95 int padded;
96 atomic_t refcnt;
97
98 spinlock_t busylock ____cacheline_aligned_in_smp;
99};
100
101static inline bool qdisc_is_running(const struct Qdisc *qdisc)
102{
103 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
104}
105
106static inline bool qdisc_run_begin(struct Qdisc *qdisc)
107{
108 if (qdisc_is_running(qdisc))
109 return false;
110 /* Variant of write_seqcount_begin() telling lockdep a trylock
111 * was attempted.
112 */
113 raw_write_seqcount_begin(&qdisc->running);
114 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
115 return true;
116}
117
118static inline void qdisc_run_end(struct Qdisc *qdisc)
119{
120 write_seqcount_end(&qdisc->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
138struct Qdisc_class_ops {
139 /* Child qdisc manipulation */
140 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
141 int (*graft)(struct Qdisc *, unsigned long cl,
142 struct Qdisc *, struct Qdisc **);
143 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
144 void (*qlen_notify)(struct Qdisc *, unsigned long);
145
146 /* Class manipulation routines */
147 unsigned long (*get)(struct Qdisc *, u32 classid);
148 void (*put)(struct Qdisc *, unsigned long);
149 int (*change)(struct Qdisc *, u32, u32,
150 struct nlattr **, unsigned long *);
151 int (*delete)(struct Qdisc *, unsigned long);
152 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
153
154 /* Filter manipulation */
155 struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long);
156 bool (*tcf_cl_offload)(u32 classid);
157 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
158 u32 classid);
159 void (*unbind_tcf)(struct Qdisc *, unsigned long);
160
161 /* rtnetlink specific */
162 int (*dump)(struct Qdisc *, unsigned long,
163 struct sk_buff *skb, struct tcmsg*);
164 int (*dump_stats)(struct Qdisc *, unsigned long,
165 struct gnet_dump *);
166};
167
168struct Qdisc_ops {
169 struct Qdisc_ops *next;
170 const struct Qdisc_class_ops *cl_ops;
171 char id[IFNAMSIZ];
172 int priv_size;
173
174 int (*enqueue)(struct sk_buff *skb,
175 struct Qdisc *sch,
176 struct sk_buff **to_free);
177 struct sk_buff * (*dequeue)(struct Qdisc *);
178 struct sk_buff * (*peek)(struct Qdisc *);
179
180 int (*init)(struct Qdisc *, struct nlattr *arg);
181 void (*reset)(struct Qdisc *);
182 void (*destroy)(struct Qdisc *);
183 int (*change)(struct Qdisc *, struct nlattr *arg);
184 void (*attach)(struct Qdisc *);
185
186 int (*dump)(struct Qdisc *, struct sk_buff *);
187 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
188
189 struct module *owner;
190};
191
192
193struct tcf_result {
194 unsigned long class;
195 u32 classid;
196};
197
198struct tcf_proto_ops {
199 struct list_head head;
200 char kind[IFNAMSIZ];
201
202 int (*classify)(struct sk_buff *,
203 const struct tcf_proto *,
204 struct tcf_result *);
205 int (*init)(struct tcf_proto*);
206 bool (*destroy)(struct tcf_proto*, bool);
207
208 unsigned long (*get)(struct tcf_proto*, u32 handle);
209 int (*change)(struct net *net, struct sk_buff *,
210 struct tcf_proto*, unsigned long,
211 u32 handle, struct nlattr **,
212 unsigned long *, bool);
213 int (*delete)(struct tcf_proto*, unsigned long);
214 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
215
216 /* rtnetlink specific */
217 int (*dump)(struct net*, struct tcf_proto*, unsigned long,
218 struct sk_buff *skb, struct tcmsg*);
219
220 struct module *owner;
221};
222
223struct tcf_proto {
224 /* Fast access part */
225 struct tcf_proto __rcu *next;
226 void __rcu *root;
227 int (*classify)(struct sk_buff *,
228 const struct tcf_proto *,
229 struct tcf_result *);
230 __be16 protocol;
231
232 /* All the rest */
233 u32 prio;
234 u32 classid;
235 struct Qdisc *q;
236 void *data;
237 const struct tcf_proto_ops *ops;
238 struct rcu_head rcu;
239};
240
241struct qdisc_skb_cb {
242 unsigned int pkt_len;
243 u16 slave_dev_queue_mapping;
244 u16 tc_classid;
245#define QDISC_CB_PRIV_LEN 20
246 unsigned char data[QDISC_CB_PRIV_LEN];
247};
248
249static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
250{
251 struct qdisc_skb_cb *qcb;
252
253 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
254 BUILD_BUG_ON(sizeof(qcb->data) < sz);
255}
256
257static inline int qdisc_qlen(const struct Qdisc *q)
258{
259 return q->q.qlen;
260}
261
262static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
263{
264 return (struct qdisc_skb_cb *)skb->cb;
265}
266
267static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
268{
269 return &qdisc->q.lock;
270}
271
272static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
273{
274 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
275
276 return q;
277}
278
279static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
280{
281 return qdisc->dev_queue->qdisc_sleeping;
282}
283
284/* The qdisc root lock is a mechanism by which to top level
285 * of a qdisc tree can be locked from any qdisc node in the
286 * forest. This allows changing the configuration of some
287 * aspect of the qdisc tree while blocking out asynchronous
288 * qdisc access in the packet processing paths.
289 *
290 * It is only legal to do this when the root will not change
291 * on us. Otherwise we'll potentially lock the wrong qdisc
292 * root. This is enforced by holding the RTNL semaphore, which
293 * all users of this lock accessor must do.
294 */
295static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
296{
297 struct Qdisc *root = qdisc_root(qdisc);
298
299 ASSERT_RTNL();
300 return qdisc_lock(root);
301}
302
303static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
304{
305 struct Qdisc *root = qdisc_root_sleeping(qdisc);
306
307 ASSERT_RTNL();
308 return qdisc_lock(root);
309}
310
311static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
312{
313 struct Qdisc *root = qdisc_root_sleeping(qdisc);
314
315 ASSERT_RTNL();
316 return &root->running;
317}
318
319static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
320{
321 return qdisc->dev_queue->dev;
322}
323
324static inline void sch_tree_lock(const struct Qdisc *q)
325{
326 spin_lock_bh(qdisc_root_sleeping_lock(q));
327}
328
329static inline void sch_tree_unlock(const struct Qdisc *q)
330{
331 spin_unlock_bh(qdisc_root_sleeping_lock(q));
332}
333
334#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
335#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
336
337extern struct Qdisc noop_qdisc;
338extern struct Qdisc_ops noop_qdisc_ops;
339extern struct Qdisc_ops pfifo_fast_ops;
340extern struct Qdisc_ops mq_qdisc_ops;
341extern struct Qdisc_ops noqueue_qdisc_ops;
342extern const struct Qdisc_ops *default_qdisc_ops;
343static inline const struct Qdisc_ops *
344get_default_qdisc_ops(const struct net_device *dev, int ntx)
345{
346 return ntx < dev->real_num_tx_queues ?
347 default_qdisc_ops : &pfifo_fast_ops;
348}
349
350struct Qdisc_class_common {
351 u32 classid;
352 struct hlist_node hnode;
353};
354
355struct Qdisc_class_hash {
356 struct hlist_head *hash;
357 unsigned int hashsize;
358 unsigned int hashmask;
359 unsigned int hashelems;
360};
361
362static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
363{
364 id ^= id >> 8;
365 id ^= id >> 4;
366 return id & mask;
367}
368
369static inline struct Qdisc_class_common *
370qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
371{
372 struct Qdisc_class_common *cl;
373 unsigned int h;
374
375 h = qdisc_class_hash(id, hash->hashmask);
376 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
377 if (cl->classid == id)
378 return cl;
379 }
380 return NULL;
381}
382
383int qdisc_class_hash_init(struct Qdisc_class_hash *);
384void qdisc_class_hash_insert(struct Qdisc_class_hash *,
385 struct Qdisc_class_common *);
386void qdisc_class_hash_remove(struct Qdisc_class_hash *,
387 struct Qdisc_class_common *);
388void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
389void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
390
391void dev_init_scheduler(struct net_device *dev);
392void dev_shutdown(struct net_device *dev);
393void dev_activate(struct net_device *dev);
394void dev_deactivate(struct net_device *dev);
395void dev_deactivate_many(struct list_head *head);
396struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
397 struct Qdisc *qdisc);
398void qdisc_reset(struct Qdisc *qdisc);
399void qdisc_destroy(struct Qdisc *qdisc);
400void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
401 unsigned int len);
402struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
403 const struct Qdisc_ops *ops);
404struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
405 const struct Qdisc_ops *ops, u32 parentid);
406void __qdisc_calculate_pkt_len(struct sk_buff *skb,
407 const struct qdisc_size_table *stab);
408bool tcf_destroy(struct tcf_proto *tp, bool force);
409void tcf_destroy_chain(struct tcf_proto __rcu **fl);
410int skb_do_redirect(struct sk_buff *);
411
412static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
413{
414#ifdef CONFIG_NET_CLS_ACT
415 return G_TC_AT(skb->tc_verd) & AT_INGRESS;
416#else
417 return false;
418#endif
419}
420
421/* Reset all TX qdiscs greater then index of a device. */
422static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
423{
424 struct Qdisc *qdisc;
425
426 for (; i < dev->num_tx_queues; i++) {
427 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
428 if (qdisc) {
429 spin_lock_bh(qdisc_lock(qdisc));
430 qdisc_reset(qdisc);
431 spin_unlock_bh(qdisc_lock(qdisc));
432 }
433 }
434}
435
436static inline void qdisc_reset_all_tx(struct net_device *dev)
437{
438 qdisc_reset_all_tx_gt(dev, 0);
439}
440
441/* Are all TX queues of the device empty? */
442static inline bool qdisc_all_tx_empty(const struct net_device *dev)
443{
444 unsigned int i;
445
446 rcu_read_lock();
447 for (i = 0; i < dev->num_tx_queues; i++) {
448 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
449 const struct Qdisc *q = rcu_dereference(txq->qdisc);
450
451 if (q->q.qlen) {
452 rcu_read_unlock();
453 return false;
454 }
455 }
456 rcu_read_unlock();
457 return true;
458}
459
460/* Are any of the TX qdiscs changing? */
461static inline bool qdisc_tx_changing(const struct net_device *dev)
462{
463 unsigned int i;
464
465 for (i = 0; i < dev->num_tx_queues; i++) {
466 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
467 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
468 return true;
469 }
470 return false;
471}
472
473/* Is the device using the noop qdisc on all queues? */
474static inline bool qdisc_tx_is_noop(const struct net_device *dev)
475{
476 unsigned int i;
477
478 for (i = 0; i < dev->num_tx_queues; i++) {
479 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
480 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
481 return false;
482 }
483 return true;
484}
485
486static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
487{
488 return qdisc_skb_cb(skb)->pkt_len;
489}
490
491/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
492enum net_xmit_qdisc_t {
493 __NET_XMIT_STOLEN = 0x00010000,
494 __NET_XMIT_BYPASS = 0x00020000,
495};
496
497#ifdef CONFIG_NET_CLS_ACT
498#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
499#else
500#define net_xmit_drop_count(e) (1)
501#endif
502
503static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
504 const struct Qdisc *sch)
505{
506#ifdef CONFIG_NET_SCHED
507 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
508
509 if (stab)
510 __qdisc_calculate_pkt_len(skb, stab);
511#endif
512}
513
514static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
515 struct sk_buff **to_free)
516{
517 qdisc_calculate_pkt_len(skb, sch);
518 return sch->enqueue(skb, sch, to_free);
519}
520
521static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
522{
523 return q->flags & TCQ_F_CPUSTATS;
524}
525
526static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
527 __u64 bytes, __u32 packets)
528{
529 bstats->bytes += bytes;
530 bstats->packets += packets;
531}
532
533static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
534 const struct sk_buff *skb)
535{
536 _bstats_update(bstats,
537 qdisc_pkt_len(skb),
538 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
539}
540
541static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
542 __u64 bytes, __u32 packets)
543{
544 u64_stats_update_begin(&bstats->syncp);
545 _bstats_update(&bstats->bstats, bytes, packets);
546 u64_stats_update_end(&bstats->syncp);
547}
548
549static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
550 const struct sk_buff *skb)
551{
552 u64_stats_update_begin(&bstats->syncp);
553 bstats_update(&bstats->bstats, skb);
554 u64_stats_update_end(&bstats->syncp);
555}
556
557static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
558 const struct sk_buff *skb)
559{
560 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
561}
562
563static inline void qdisc_bstats_update(struct Qdisc *sch,
564 const struct sk_buff *skb)
565{
566 bstats_update(&sch->bstats, skb);
567}
568
569static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
570 const struct sk_buff *skb)
571{
572 sch->qstats.backlog -= qdisc_pkt_len(skb);
573}
574
575static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
576 const struct sk_buff *skb)
577{
578 sch->qstats.backlog += qdisc_pkt_len(skb);
579}
580
581static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
582{
583 sch->qstats.drops += count;
584}
585
586static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
587{
588 qstats->drops++;
589}
590
591static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
592{
593 qstats->overlimits++;
594}
595
596static inline void qdisc_qstats_drop(struct Qdisc *sch)
597{
598 qstats_drop_inc(&sch->qstats);
599}
600
601static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
602{
603 this_cpu_inc(sch->cpu_qstats->drops);
604}
605
606static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
607{
608 sch->qstats.overlimits++;
609}
610
611static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
612{
613 qh->head = NULL;
614 qh->tail = NULL;
615 qh->qlen = 0;
616}
617
618static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
619 struct qdisc_skb_head *qh)
620{
621 struct sk_buff *last = qh->tail;
622
623 if (last) {
624 skb->next = NULL;
625 last->next = skb;
626 qh->tail = skb;
627 } else {
628 qh->tail = skb;
629 qh->head = skb;
630 }
631 qh->qlen++;
632 qdisc_qstats_backlog_inc(sch, skb);
633
634 return NET_XMIT_SUCCESS;
635}
636
637static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
638{
639 return __qdisc_enqueue_tail(skb, sch, &sch->q);
640}
641
642static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
643{
644 struct sk_buff *skb = qh->head;
645
646 if (likely(skb != NULL)) {
647 qh->head = skb->next;
648 qh->qlen--;
649 if (qh->head == NULL)
650 qh->tail = NULL;
651 skb->next = NULL;
652 }
653
654 return skb;
655}
656
657static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
658{
659 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
660
661 if (likely(skb != NULL)) {
662 qdisc_qstats_backlog_dec(sch, skb);
663 qdisc_bstats_update(sch, skb);
664 }
665
666 return skb;
667}
668
669/* Instead of calling kfree_skb() while root qdisc lock is held,
670 * queue the skb for future freeing at end of __dev_xmit_skb()
671 */
672static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
673{
674 skb->next = *to_free;
675 *to_free = skb;
676}
677
678static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
679 struct qdisc_skb_head *qh,
680 struct sk_buff **to_free)
681{
682 struct sk_buff *skb = __qdisc_dequeue_head(qh);
683
684 if (likely(skb != NULL)) {
685 unsigned int len = qdisc_pkt_len(skb);
686
687 qdisc_qstats_backlog_dec(sch, skb);
688 __qdisc_drop(skb, to_free);
689 return len;
690 }
691
692 return 0;
693}
694
695static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
696 struct sk_buff **to_free)
697{
698 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
699}
700
701static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
702{
703 const struct qdisc_skb_head *qh = &sch->q;
704
705 return qh->head;
706}
707
708/* generic pseudo peek method for non-work-conserving qdisc */
709static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
710{
711 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
712 if (!sch->gso_skb) {
713 sch->gso_skb = sch->dequeue(sch);
714 if (sch->gso_skb) {
715 /* it's still part of the queue */
716 qdisc_qstats_backlog_inc(sch, sch->gso_skb);
717 sch->q.qlen++;
718 }
719 }
720
721 return sch->gso_skb;
722}
723
724/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
725static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
726{
727 struct sk_buff *skb = sch->gso_skb;
728
729 if (skb) {
730 sch->gso_skb = NULL;
731 qdisc_qstats_backlog_dec(sch, skb);
732 sch->q.qlen--;
733 } else {
734 skb = sch->dequeue(sch);
735 }
736
737 return skb;
738}
739
740static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
741{
742 /*
743 * We do not know the backlog in bytes of this list, it
744 * is up to the caller to correct it
745 */
746 ASSERT_RTNL();
747 if (qh->qlen) {
748 rtnl_kfree_skbs(qh->head, qh->tail);
749
750 qh->head = NULL;
751 qh->tail = NULL;
752 qh->qlen = 0;
753 }
754}
755
756static inline void qdisc_reset_queue(struct Qdisc *sch)
757{
758 __qdisc_reset_queue(&sch->q);
759 sch->qstats.backlog = 0;
760}
761
762static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
763 struct Qdisc **pold)
764{
765 struct Qdisc *old;
766
767 sch_tree_lock(sch);
768 old = *pold;
769 *pold = new;
770 if (old != NULL) {
771 qdisc_tree_reduce_backlog(old, old->q.qlen, old->qstats.backlog);
772 qdisc_reset(old);
773 }
774 sch_tree_unlock(sch);
775
776 return old;
777}
778
779static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
780{
781 rtnl_kfree_skbs(skb, skb);
782 qdisc_qstats_drop(sch);
783}
784
785
786static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
787 struct sk_buff **to_free)
788{
789 __qdisc_drop(skb, to_free);
790 qdisc_qstats_drop(sch);
791
792 return NET_XMIT_DROP;
793}
794
795/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
796 long it will take to send a packet given its size.
797 */
798static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
799{
800 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
801 if (slot < 0)
802 slot = 0;
803 slot >>= rtab->rate.cell_log;
804 if (slot > 255)
805 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
806 return rtab->data[slot];
807}
808
809struct psched_ratecfg {
810 u64 rate_bytes_ps; /* bytes per second */
811 u32 mult;
812 u16 overhead;
813 u8 linklayer;
814 u8 shift;
815};
816
817static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
818 unsigned int len)
819{
820 len += r->overhead;
821
822 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
823 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
824
825 return ((u64)len * r->mult) >> r->shift;
826}
827
828void psched_ratecfg_precompute(struct psched_ratecfg *r,
829 const struct tc_ratespec *conf,
830 u64 rate64);
831
832static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
833 const struct psched_ratecfg *r)
834{
835 memset(res, 0, sizeof(*res));
836
837 /* legacy struct tc_ratespec has a 32bit @rate field
838 * Qdisc using 64bit rate should add new attributes
839 * in order to maintain compatibility.
840 */
841 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
842
843 res->overhead = r->overhead;
844 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
845}
846
847#endif