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[pohmelfs.git] / include / net / sch_generic.h
blob55ce96b53b092e3ca04db6eaa7d6888fb9f478bc
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
12 struct Qdisc_ops;
13 struct qdisc_walker;
14 struct tcf_walker;
15 struct module;
16
17 struct qdisc_rate_table {
18 struct tc_ratespec rate;
19 u32 data[256];
20 struct qdisc_rate_table *next;
21 int refcnt;
22 };
23
24 enum 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 */
33 enum qdisc___state_t {
34 __QDISC___STATE_RUNNING = 1,
35 };
36
37 struct 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
45 struct 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
88 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
89 {
90 return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
91 }
92
93 static 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
101 static inline void qdisc_run_end(struct Qdisc *qdisc)
102 {
103 qdisc->__state &= ~__QDISC___STATE_RUNNING;
104 }
105
106 static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
107 {
108 return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
109 }
110
111 static inline void qdisc_throttled(struct Qdisc *qdisc)
112 {
113 set_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
114 }
115
116 static inline void qdisc_unthrottled(struct Qdisc *qdisc)
117 {
118 clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
119 }
120
121 struct 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
150 struct 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
174 struct tcf_result {
175 unsigned long class;
176 u32 classid;
177 };
178
179 struct 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
204 struct 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
221 struct qdisc_skb_cb {
222 unsigned int pkt_len;
223 unsigned char data[24];
224 };
225
226 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
227 {
228 struct qdisc_skb_cb *qcb;
229 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(unsigned int) + sz);
230 BUILD_BUG_ON(sizeof(qcb->data) < sz);
231 }
232
233 static inline int qdisc_qlen(const struct Qdisc *q)
234 {
235 return q->q.qlen;
236 }
237
238 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
239 {
240 return (struct qdisc_skb_cb *)skb->cb;
241 }
242
243 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
244 {
245 return &qdisc->q.lock;
246 }
247
248 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
249 {
250 return qdisc->dev_queue->qdisc;
251 }
252
253 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
254 {
255 return qdisc->dev_queue->qdisc_sleeping;
256 }
257
258 /* The qdisc root lock is a mechanism by which to top level
259 * of a qdisc tree can be locked from any qdisc node in the
260 * forest. This allows changing the configuration of some
261 * aspect of the qdisc tree while blocking out asynchronous
262 * qdisc access in the packet processing paths.
263 *
264 * It is only legal to do this when the root will not change
265 * on us. Otherwise we'll potentially lock the wrong qdisc
266 * root. This is enforced by holding the RTNL semaphore, which
267 * all users of this lock accessor must do.
268 */
269 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
270 {
271 struct Qdisc *root = qdisc_root(qdisc);
272
273 ASSERT_RTNL();
274 return qdisc_lock(root);
275 }
276
277 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
278 {
279 struct Qdisc *root = qdisc_root_sleeping(qdisc);
280
281 ASSERT_RTNL();
282 return qdisc_lock(root);
283 }
284
285 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
286 {
287 return qdisc->dev_queue->dev;
288 }
289
290 static inline void sch_tree_lock(const struct Qdisc *q)
291 {
292 spin_lock_bh(qdisc_root_sleeping_lock(q));
293 }
294
295 static inline void sch_tree_unlock(const struct Qdisc *q)
296 {
297 spin_unlock_bh(qdisc_root_sleeping_lock(q));
298 }
299
300 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
301 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
302
303 extern struct Qdisc noop_qdisc;
304 extern struct Qdisc_ops noop_qdisc_ops;
305 extern struct Qdisc_ops pfifo_fast_ops;
306 extern struct Qdisc_ops mq_qdisc_ops;
307
308 struct Qdisc_class_common {
309 u32 classid;
310 struct hlist_node hnode;
311 };
312
313 struct Qdisc_class_hash {
314 struct hlist_head *hash;
315 unsigned int hashsize;
316 unsigned int hashmask;
317 unsigned int hashelems;
318 };
319
320 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
321 {
322 id ^= id >> 8;
323 id ^= id >> 4;
324 return id & mask;
325 }
326
327 static inline struct Qdisc_class_common *
328 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
329 {
330 struct Qdisc_class_common *cl;
331 struct hlist_node *n;
332 unsigned int h;
333
334 h = qdisc_class_hash(id, hash->hashmask);
335 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
336 if (cl->classid == id)
337 return cl;
338 }
339 return NULL;
340 }
341
342 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
343 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
344 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
345 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
346 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
347
348 extern void dev_init_scheduler(struct net_device *dev);
349 extern void dev_shutdown(struct net_device *dev);
350 extern void dev_activate(struct net_device *dev);
351 extern void dev_deactivate(struct net_device *dev);
352 extern void dev_deactivate_many(struct list_head *head);
353 extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
354 struct Qdisc *qdisc);
355 extern void qdisc_reset(struct Qdisc *qdisc);
356 extern void qdisc_destroy(struct Qdisc *qdisc);
357 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
358 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
359 struct Qdisc_ops *ops);
360 extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
361 struct Qdisc_ops *ops, u32 parentid);
362 extern void __qdisc_calculate_pkt_len(struct sk_buff *skb,
363 const struct qdisc_size_table *stab);
364 extern void tcf_destroy(struct tcf_proto *tp);
365 extern void tcf_destroy_chain(struct tcf_proto **fl);
366
367 /* Reset all TX qdiscs greater then index of a device. */
368 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
369 {
370 struct Qdisc *qdisc;
371
372 for (; i < dev->num_tx_queues; i++) {
373 qdisc = netdev_get_tx_queue(dev, i)->qdisc;
374 if (qdisc) {
375 spin_lock_bh(qdisc_lock(qdisc));
376 qdisc_reset(qdisc);
377 spin_unlock_bh(qdisc_lock(qdisc));
378 }
379 }
380 }
381
382 static inline void qdisc_reset_all_tx(struct net_device *dev)
383 {
384 qdisc_reset_all_tx_gt(dev, 0);
385 }
386
387 /* Are all TX queues of the device empty? */
388 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
389 {
390 unsigned int i;
391 for (i = 0; i < dev->num_tx_queues; i++) {
392 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
393 const struct Qdisc *q = txq->qdisc;
394
395 if (q->q.qlen)
396 return false;
397 }
398 return true;
399 }
400
401 /* Are any of the TX qdiscs changing? */
402 static inline bool qdisc_tx_changing(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 if (txq->qdisc != txq->qdisc_sleeping)
408 return true;
409 }
410 return false;
411 }
412
413 /* Is the device using the noop qdisc on all queues? */
414 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
415 {
416 unsigned int i;
417 for (i = 0; i < dev->num_tx_queues; i++) {
418 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
419 if (txq->qdisc != &noop_qdisc)
420 return false;
421 }
422 return true;
423 }
424
425 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
426 {
427 return qdisc_skb_cb(skb)->pkt_len;
428 }
429
430 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
431 enum net_xmit_qdisc_t {
432 __NET_XMIT_STOLEN = 0x00010000,
433 __NET_XMIT_BYPASS = 0x00020000,
434 };
435
436 #ifdef CONFIG_NET_CLS_ACT
437 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
438 #else
439 #define net_xmit_drop_count(e) (1)
440 #endif
441
442 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
443 const struct Qdisc *sch)
444 {
445 #ifdef CONFIG_NET_SCHED
446 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
447
448 if (stab)
449 __qdisc_calculate_pkt_len(skb, stab);
450 #endif
451 }
452
453 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
454 {
455 qdisc_calculate_pkt_len(skb, sch);
456 return sch->enqueue(skb, sch);
457 }
458
459 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
460 {
461 qdisc_skb_cb(skb)->pkt_len = skb->len;
462 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
463 }
464
465
466 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
467 const struct sk_buff *skb)
468 {
469 bstats->bytes += qdisc_pkt_len(skb);
470 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
471 }
472
473 static inline void qdisc_bstats_update(struct Qdisc *sch,
474 const struct sk_buff *skb)
475 {
476 bstats_update(&sch->bstats, skb);
477 }
478
479 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
480 struct sk_buff_head *list)
481 {
482 __skb_queue_tail(list, skb);
483 sch->qstats.backlog += qdisc_pkt_len(skb);
484
485 return NET_XMIT_SUCCESS;
486 }
487
488 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
489 {
490 return __qdisc_enqueue_tail(skb, sch, &sch->q);
491 }
492
493 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
494 struct sk_buff_head *list)
495 {
496 struct sk_buff *skb = __skb_dequeue(list);
497
498 if (likely(skb != NULL)) {
499 sch->qstats.backlog -= qdisc_pkt_len(skb);
500 qdisc_bstats_update(sch, skb);
501 }
502
503 return skb;
504 }
505
506 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
507 {
508 return __qdisc_dequeue_head(sch, &sch->q);
509 }
510
511 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
512 struct sk_buff_head *list)
513 {
514 struct sk_buff *skb = __skb_dequeue(list);
515
516 if (likely(skb != NULL)) {
517 unsigned int len = qdisc_pkt_len(skb);
518 sch->qstats.backlog -= len;
519 kfree_skb(skb);
520 return len;
521 }
522
523 return 0;
524 }
525
526 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
527 {
528 return __qdisc_queue_drop_head(sch, &sch->q);
529 }
530
531 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
532 struct sk_buff_head *list)
533 {
534 struct sk_buff *skb = __skb_dequeue_tail(list);
535
536 if (likely(skb != NULL))
537 sch->qstats.backlog -= qdisc_pkt_len(skb);
538
539 return skb;
540 }
541
542 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
543 {
544 return __qdisc_dequeue_tail(sch, &sch->q);
545 }
546
547 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
548 {
549 return skb_peek(&sch->q);
550 }
551
552 /* generic pseudo peek method for non-work-conserving qdisc */
553 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
554 {
555 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
556 if (!sch->gso_skb) {
557 sch->gso_skb = sch->dequeue(sch);
558 if (sch->gso_skb)
559 /* it's still part of the queue */
560 sch->q.qlen++;
561 }
562
563 return sch->gso_skb;
564 }
565
566 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
567 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
568 {
569 struct sk_buff *skb = sch->gso_skb;
570
571 if (skb) {
572 sch->gso_skb = NULL;
573 sch->q.qlen--;
574 } else {
575 skb = sch->dequeue(sch);
576 }
577
578 return skb;
579 }
580
581 static inline void __qdisc_reset_queue(struct Qdisc *sch,
582 struct sk_buff_head *list)
583 {
584 /*
585 * We do not know the backlog in bytes of this list, it
586 * is up to the caller to correct it
587 */
588 __skb_queue_purge(list);
589 }
590
591 static inline void qdisc_reset_queue(struct Qdisc *sch)
592 {
593 __qdisc_reset_queue(sch, &sch->q);
594 sch->qstats.backlog = 0;
595 }
596
597 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
598 struct sk_buff_head *list)
599 {
600 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
601
602 if (likely(skb != NULL)) {
603 unsigned int len = qdisc_pkt_len(skb);
604 kfree_skb(skb);
605 return len;
606 }
607
608 return 0;
609 }
610
611 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
612 {
613 return __qdisc_queue_drop(sch, &sch->q);
614 }
615
616 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
617 {
618 kfree_skb(skb);
619 sch->qstats.drops++;
620
621 return NET_XMIT_DROP;
622 }
623
624 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
625 {
626 sch->qstats.drops++;
627
628 #ifdef CONFIG_NET_CLS_ACT
629 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
630 goto drop;
631
632 return NET_XMIT_SUCCESS;
633
634 drop:
635 #endif
636 kfree_skb(skb);
637 return NET_XMIT_DROP;
638 }
639
640 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
641 long it will take to send a packet given its size.
642 */
643 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
644 {
645 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
646 if (slot < 0)
647 slot = 0;
648 slot >>= rtab->rate.cell_log;
649 if (slot > 255)
650 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
651 return rtab->data[slot];
652 }
653
654 #ifdef CONFIG_NET_CLS_ACT
655 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
656 int action)
657 {
658 struct sk_buff *n;
659
660 n = skb_clone(skb, gfp_mask);
661
662 if (n) {
663 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
664 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
665 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
666 }
667 return n;
668 }
669 #endif
670
671 #endif