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 <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
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_WARN_NONWC (1 << 16)
54 int padded;
55 const struct Qdisc_ops *ops;
56 struct qdisc_size_table __rcu *stab;
57 struct list_head list;
58 u32 handle;
59 u32 parent;
60 atomic_t refcnt;
61 struct gnet_stats_rate_est rate_est;
62 int (*reshape_fail)(struct sk_buff *skb,
63 struct Qdisc *q);
64
65 void *u32_node;
66
67 /* This field is deprecated, but it is still used by CBQ
68 * and it will live until better solution will be invented.
69 */
70 struct Qdisc *__parent;
71 struct netdev_queue *dev_queue;
72 struct Qdisc *next_sched;
73
74 struct sk_buff *gso_skb;
75 /*
76 * For performance sake on SMP, we put highly modified fields at the end
77 */
78 unsigned long state;
79 struct sk_buff_head q;
80 struct gnet_stats_basic_packed bstats;
81 unsigned int __state;
82 struct gnet_stats_queue qstats;
83 struct rcu_head rcu_head;
84 spinlock_t busylock;
85 u32 limit;
86};
87
88static inline bool qdisc_is_running(const struct Qdisc *qdisc)
89{
90 return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
91}
92
93static inline bool qdisc_run_begin(struct Qdisc *qdisc)
94{
95 if (qdisc_is_running(qdisc))
96 return false;
97 qdisc->__state |= __QDISC___STATE_RUNNING;
98 return true;
99}
100
101static inline void qdisc_run_end(struct Qdisc *qdisc)
102{
103 qdisc->__state &= ~__QDISC___STATE_RUNNING;
104}
105
106static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
107{
108 return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
109}
110
111static inline void qdisc_throttled(struct Qdisc *qdisc)
112{
113 set_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
114}
115
116static inline void qdisc_unthrottled(struct Qdisc *qdisc)
117{
118 clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
119}
120
121struct Qdisc_class_ops {
122 /* Child qdisc manipulation */
123 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
124 int (*graft)(struct Qdisc *, unsigned long cl,
125 struct Qdisc *, struct Qdisc **);
126 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
127 void (*qlen_notify)(struct Qdisc *, unsigned long);
128
129 /* Class manipulation routines */
130 unsigned long (*get)(struct Qdisc *, u32 classid);
131 void (*put)(struct Qdisc *, unsigned long);
132 int (*change)(struct Qdisc *, u32, u32,
133 struct nlattr **, unsigned long *);
134 int (*delete)(struct Qdisc *, unsigned long);
135 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
136
137 /* Filter manipulation */
138 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
139 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
140 u32 classid);
141 void (*unbind_tcf)(struct Qdisc *, unsigned long);
142
143 /* rtnetlink specific */
144 int (*dump)(struct Qdisc *, unsigned long,
145 struct sk_buff *skb, struct tcmsg*);
146 int (*dump_stats)(struct Qdisc *, unsigned long,
147 struct gnet_dump *);
148};
149
150struct Qdisc_ops {
151 struct Qdisc_ops *next;
152 const struct Qdisc_class_ops *cl_ops;
153 char id[IFNAMSIZ];
154 int priv_size;
155
156 int (*enqueue)(struct sk_buff *, struct Qdisc *);
157 struct sk_buff * (*dequeue)(struct Qdisc *);
158 struct sk_buff * (*peek)(struct Qdisc *);
159 unsigned int (*drop)(struct Qdisc *);
160
161 int (*init)(struct Qdisc *, struct nlattr *arg);
162 void (*reset)(struct Qdisc *);
163 void (*destroy)(struct Qdisc *);
164 int (*change)(struct Qdisc *, struct nlattr *arg);
165 void (*attach)(struct Qdisc *);
166
167 int (*dump)(struct Qdisc *, struct sk_buff *);
168 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
169
170 struct module *owner;
171};
172
173
174struct tcf_result {
175 unsigned long class;
176 u32 classid;
177};
178
179struct tcf_proto_ops {
180 struct tcf_proto_ops *next;
181 char kind[IFNAMSIZ];
182
183 int (*classify)(struct sk_buff *,
184 const struct tcf_proto *,
185 struct tcf_result *);
186 int (*init)(struct tcf_proto*);
187 void (*destroy)(struct tcf_proto*);
188
189 unsigned long (*get)(struct tcf_proto*, u32 handle);
190 void (*put)(struct tcf_proto*, unsigned long);
191 int (*change)(struct tcf_proto*, unsigned long,
192 u32 handle, struct nlattr **,
193 unsigned long *);
194 int (*delete)(struct tcf_proto*, unsigned long);
195 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
196
197 /* rtnetlink specific */
198 int (*dump)(struct tcf_proto*, unsigned long,
199 struct sk_buff *skb, struct tcmsg*);
200
201 struct module *owner;
202};
203
204struct tcf_proto {
205 /* Fast access part */
206 struct tcf_proto *next;
207 void *root;
208 int (*classify)(struct sk_buff *,
209 const struct tcf_proto *,
210 struct tcf_result *);
211 __be16 protocol;
212
213 /* All the rest */
214 u32 prio;
215 u32 classid;
216 struct Qdisc *q;
217 void *data;
218 const struct tcf_proto_ops *ops;
219};
220
221struct qdisc_skb_cb {
222 unsigned int pkt_len;
223 u16 bond_queue_mapping;
224 u16 _pad;
225 unsigned char data[20];
226};
227
228static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
229{
230 struct qdisc_skb_cb *qcb;
231
232 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
233 BUILD_BUG_ON(sizeof(qcb->data) < sz);
234}
235
236static inline int qdisc_qlen(const struct Qdisc *q)
237{
238 return q->q.qlen;
239}
240
241static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
242{
243 return (struct qdisc_skb_cb *)skb->cb;
244}
245
246static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
247{
248 return &qdisc->q.lock;
249}
250
251static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
252{
253 return qdisc->dev_queue->qdisc;
254}
255
256static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
257{
258 return qdisc->dev_queue->qdisc_sleeping;
259}
260
261/* The qdisc root lock is a mechanism by which to top level
262 * of a qdisc tree can be locked from any qdisc node in the
263 * forest. This allows changing the configuration of some
264 * aspect of the qdisc tree while blocking out asynchronous
265 * qdisc access in the packet processing paths.
266 *
267 * It is only legal to do this when the root will not change
268 * on us. Otherwise we'll potentially lock the wrong qdisc
269 * root. This is enforced by holding the RTNL semaphore, which
270 * all users of this lock accessor must do.
271 */
272static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
273{
274 struct Qdisc *root = qdisc_root(qdisc);
275
276 ASSERT_RTNL();
277 return qdisc_lock(root);
278}
279
280static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
281{
282 struct Qdisc *root = qdisc_root_sleeping(qdisc);
283
284 ASSERT_RTNL();
285 return qdisc_lock(root);
286}
287
288static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
289{
290 return qdisc->dev_queue->dev;
291}
292
293static inline void sch_tree_lock(const struct Qdisc *q)
294{
295 spin_lock_bh(qdisc_root_sleeping_lock(q));
296}
297
298static inline void sch_tree_unlock(const struct Qdisc *q)
299{
300 spin_unlock_bh(qdisc_root_sleeping_lock(q));
301}
302
303#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
304#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
305
306extern struct Qdisc noop_qdisc;
307extern struct Qdisc_ops noop_qdisc_ops;
308extern struct Qdisc_ops pfifo_fast_ops;
309extern struct Qdisc_ops mq_qdisc_ops;
310
311struct Qdisc_class_common {
312 u32 classid;
313 struct hlist_node hnode;
314};
315
316struct Qdisc_class_hash {
317 struct hlist_head *hash;
318 unsigned int hashsize;
319 unsigned int hashmask;
320 unsigned int hashelems;
321};
322
323static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
324{
325 id ^= id >> 8;
326 id ^= id >> 4;
327 return id & mask;
328}
329
330static inline struct Qdisc_class_common *
331qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
332{
333 struct Qdisc_class_common *cl;
334 struct hlist_node *n;
335 unsigned int h;
336
337 h = qdisc_class_hash(id, hash->hashmask);
338 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
339 if (cl->classid == id)
340 return cl;
341 }
342 return NULL;
343}
344
345extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
346extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
347extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
348extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
349extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
350
351extern void dev_init_scheduler(struct net_device *dev);
352extern void dev_shutdown(struct net_device *dev);
353extern void dev_activate(struct net_device *dev);
354extern void dev_deactivate(struct net_device *dev);
355extern void dev_deactivate_many(struct list_head *head);
356extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
357 struct Qdisc *qdisc);
358extern void qdisc_reset(struct Qdisc *qdisc);
359extern void qdisc_destroy(struct Qdisc *qdisc);
360extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
361extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
362 struct Qdisc_ops *ops);
363extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
364 struct Qdisc_ops *ops, u32 parentid);
365extern void __qdisc_calculate_pkt_len(struct sk_buff *skb,
366 const struct qdisc_size_table *stab);
367extern void tcf_destroy(struct tcf_proto *tp);
368extern void tcf_destroy_chain(struct tcf_proto **fl);
369
370/* Reset all TX qdiscs greater then index of a device. */
371static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
372{
373 struct Qdisc *qdisc;
374
375 for (; i < dev->num_tx_queues; i++) {
376 qdisc = netdev_get_tx_queue(dev, i)->qdisc;
377 if (qdisc) {
378 spin_lock_bh(qdisc_lock(qdisc));
379 qdisc_reset(qdisc);
380 spin_unlock_bh(qdisc_lock(qdisc));
381 }
382 }
383}
384
385static inline void qdisc_reset_all_tx(struct net_device *dev)
386{
387 qdisc_reset_all_tx_gt(dev, 0);
388}
389
390/* Are all TX queues of the device empty? */
391static inline bool qdisc_all_tx_empty(const struct net_device *dev)
392{
393 unsigned int i;
394 for (i = 0; i < dev->num_tx_queues; i++) {
395 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
396 const struct Qdisc *q = txq->qdisc;
397
398 if (q->q.qlen)
399 return false;
400 }
401 return true;
402}
403
404/* Are any of the TX qdiscs changing? */
405static inline bool qdisc_tx_changing(const struct net_device *dev)
406{
407 unsigned int i;
408 for (i = 0; i < dev->num_tx_queues; i++) {
409 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
410 if (txq->qdisc != txq->qdisc_sleeping)
411 return true;
412 }
413 return false;
414}
415
416/* Is the device using the noop qdisc on all queues? */
417static inline bool qdisc_tx_is_noop(const struct net_device *dev)
418{
419 unsigned int i;
420 for (i = 0; i < dev->num_tx_queues; i++) {
421 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
422 if (txq->qdisc != &noop_qdisc)
423 return false;
424 }
425 return true;
426}
427
428static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
429{
430 return qdisc_skb_cb(skb)->pkt_len;
431}
432
433/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
434enum net_xmit_qdisc_t {
435 __NET_XMIT_STOLEN = 0x00010000,
436 __NET_XMIT_BYPASS = 0x00020000,
437};
438
439#ifdef CONFIG_NET_CLS_ACT
440#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
441#else
442#define net_xmit_drop_count(e) (1)
443#endif
444
445static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
446 const struct Qdisc *sch)
447{
448#ifdef CONFIG_NET_SCHED
449 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
450
451 if (stab)
452 __qdisc_calculate_pkt_len(skb, stab);
453#endif
454}
455
456static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
457{
458 qdisc_calculate_pkt_len(skb, sch);
459 return sch->enqueue(skb, sch);
460}
461
462static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
463{
464 qdisc_skb_cb(skb)->pkt_len = skb->len;
465 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
466}
467
468
469static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
470 const struct sk_buff *skb)
471{
472 bstats->bytes += qdisc_pkt_len(skb);
473 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
474}
475
476static inline void qdisc_bstats_update(struct Qdisc *sch,
477 const struct sk_buff *skb)
478{
479 bstats_update(&sch->bstats, skb);
480}
481
482static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
483 struct sk_buff_head *list)
484{
485 __skb_queue_tail(list, skb);
486 sch->qstats.backlog += qdisc_pkt_len(skb);
487
488 return NET_XMIT_SUCCESS;
489}
490
491static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
492{
493 return __qdisc_enqueue_tail(skb, sch, &sch->q);
494}
495
496static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
497 struct sk_buff_head *list)
498{
499 struct sk_buff *skb = __skb_dequeue(list);
500
501 if (likely(skb != NULL)) {
502 sch->qstats.backlog -= qdisc_pkt_len(skb);
503 qdisc_bstats_update(sch, skb);
504 }
505
506 return skb;
507}
508
509static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
510{
511 return __qdisc_dequeue_head(sch, &sch->q);
512}
513
514static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
515 struct sk_buff_head *list)
516{
517 struct sk_buff *skb = __skb_dequeue(list);
518
519 if (likely(skb != NULL)) {
520 unsigned int len = qdisc_pkt_len(skb);
521 sch->qstats.backlog -= len;
522 kfree_skb(skb);
523 return len;
524 }
525
526 return 0;
527}
528
529static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
530{
531 return __qdisc_queue_drop_head(sch, &sch->q);
532}
533
534static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
535 struct sk_buff_head *list)
536{
537 struct sk_buff *skb = __skb_dequeue_tail(list);
538
539 if (likely(skb != NULL))
540 sch->qstats.backlog -= qdisc_pkt_len(skb);
541
542 return skb;
543}
544
545static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
546{
547 return __qdisc_dequeue_tail(sch, &sch->q);
548}
549
550static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
551{
552 return skb_peek(&sch->q);
553}
554
555/* generic pseudo peek method for non-work-conserving qdisc */
556static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
557{
558 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
559 if (!sch->gso_skb) {
560 sch->gso_skb = sch->dequeue(sch);
561 if (sch->gso_skb)
562 /* it's still part of the queue */
563 sch->q.qlen++;
564 }
565
566 return sch->gso_skb;
567}
568
569/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
570static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
571{
572 struct sk_buff *skb = sch->gso_skb;
573
574 if (skb) {
575 sch->gso_skb = NULL;
576 sch->q.qlen--;
577 } else {
578 skb = sch->dequeue(sch);
579 }
580
581 return skb;
582}
583
584static inline void __qdisc_reset_queue(struct Qdisc *sch,
585 struct sk_buff_head *list)
586{
587 /*
588 * We do not know the backlog in bytes of this list, it
589 * is up to the caller to correct it
590 */
591 __skb_queue_purge(list);
592}
593
594static inline void qdisc_reset_queue(struct Qdisc *sch)
595{
596 __qdisc_reset_queue(sch, &sch->q);
597 sch->qstats.backlog = 0;
598}
599
600static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
601 struct sk_buff_head *list)
602{
603 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
604
605 if (likely(skb != NULL)) {
606 unsigned int len = qdisc_pkt_len(skb);
607 kfree_skb(skb);
608 return len;
609 }
610
611 return 0;
612}
613
614static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
615{
616 return __qdisc_queue_drop(sch, &sch->q);
617}
618
619static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
620{
621 kfree_skb(skb);
622 sch->qstats.drops++;
623
624 return NET_XMIT_DROP;
625}
626
627static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
628{
629 sch->qstats.drops++;
630
631#ifdef CONFIG_NET_CLS_ACT
632 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
633 goto drop;
634
635 return NET_XMIT_SUCCESS;
636
637drop:
638#endif
639 kfree_skb(skb);
640 return NET_XMIT_DROP;
641}
642
643/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
644 long it will take to send a packet given its size.
645 */
646static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
647{
648 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
649 if (slot < 0)
650 slot = 0;
651 slot >>= rtab->rate.cell_log;
652 if (slot > 255)
653 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
654 return rtab->data[slot];
655}
656
657#ifdef CONFIG_NET_CLS_ACT
658static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
659 int action)
660{
661 struct sk_buff *n;
662
663 n = skb_clone(skb, gfp_mask);
664
665 if (n) {
666 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
667 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
668 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
669 }
670 return n;
671}
672#endif
673
674#endif