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perf symbols: Simplify out_fixup in kernel syms loading
[linux-2.6.git] / include / net / sch_generic.h
blobd9611e03241873fd5cb4140cf0d9c5e3ae7a2486
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 u16 slave_dev_queue_mapping;
224 u16 _pad;
225 unsigned char data[20];
226 };
227
228 static 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
236 static inline int qdisc_qlen(const struct Qdisc *q)
237 {
238 return q->q.qlen;
239 }
240
241 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
242 {
243 return (struct qdisc_skb_cb *)skb->cb;
244 }
245
246 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
247 {
248 return &qdisc->q.lock;
249 }
250
251 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
252 {
253 return qdisc->dev_queue->qdisc;
254 }
255
256 static 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 */
272 static 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
280 static 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
288 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
289 {
290 return qdisc->dev_queue->dev;
291 }
292
293 static inline void sch_tree_lock(const struct Qdisc *q)
294 {
295 spin_lock_bh(qdisc_root_sleeping_lock(q));
296 }
297
298 static 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
306 extern struct Qdisc noop_qdisc;
307 extern struct Qdisc_ops noop_qdisc_ops;
308 extern struct Qdisc_ops pfifo_fast_ops;
309 extern struct Qdisc_ops mq_qdisc_ops;
310
311 struct Qdisc_class_common {
312 u32 classid;
313 struct hlist_node hnode;
314 };
315
316 struct Qdisc_class_hash {
317 struct hlist_head *hash;
318 unsigned int hashsize;
319 unsigned int hashmask;
320 unsigned int hashelems;
321 };
322
323 static 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
330 static inline struct Qdisc_class_common *
331 qdisc_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
345 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
346 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
347 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
348 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
349 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
350
351 extern void dev_init_scheduler(struct net_device *dev);
352 extern void dev_shutdown(struct net_device *dev);
353 extern void dev_activate(struct net_device *dev);
354 extern void dev_deactivate(struct net_device *dev);
355 extern void dev_deactivate_many(struct list_head *head);
356 extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
357 struct Qdisc *qdisc);
358 extern void qdisc_reset(struct Qdisc *qdisc);
359 extern void qdisc_destroy(struct Qdisc *qdisc);
360 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
361 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
362 struct Qdisc_ops *ops);
363 extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
364 struct Qdisc_ops *ops, u32 parentid);
365 extern void __qdisc_calculate_pkt_len(struct sk_buff *skb,
366 const struct qdisc_size_table *stab);
367 extern void tcf_destroy(struct tcf_proto *tp);
368 extern void tcf_destroy_chain(struct tcf_proto **fl);
369
370 /* Reset all TX qdiscs greater then index of a device. */
371 static 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
385 static 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? */
391 static 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? */
405 static 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? */
417 static 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
428 static 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) */
434 enum 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
445 static 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
456 static 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
462 static 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
469 static 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
476 static inline void qdisc_bstats_update(struct Qdisc *sch,
477 const struct sk_buff *skb)
478 {
479 bstats_update(&sch->bstats, skb);
480 }
481
482 static 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
491 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
492 {
493 return __qdisc_enqueue_tail(skb, sch, &sch->q);
494 }
495
496 static 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
509 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
510 {
511 return __qdisc_dequeue_head(sch, &sch->q);
512 }
513
514 static 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
529 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
530 {
531 return __qdisc_queue_drop_head(sch, &sch->q);
532 }
533
534 static 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
545 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
546 {
547 return __qdisc_dequeue_tail(sch, &sch->q);
548 }
549
550 static 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 */
556 static 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() */
570 static 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
584 static 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
594 static inline void qdisc_reset_queue(struct Qdisc *sch)
595 {
596 __qdisc_reset_queue(sch, &sch->q);
597 sch->qstats.backlog = 0;
598 }
599
600 static 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
614 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
615 {
616 return __qdisc_queue_drop(sch, &sch->q);
617 }
618
619 static 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
627 static 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
637 drop:
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 */
646 static 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
658 static 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
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