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The discovered bit in PGCCSR register indicates if the device has been
[linux-2.6/next.git] / include / net / sch_generic.h
blob7f7ebee82202445260c029fba2ef71d917bc916b
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 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 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 long data[];
224 };
225
226 static inline int qdisc_qlen(struct Qdisc *q)
227 {
228 return q->q.qlen;
229 }
230
231 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
232 {
233 return (struct qdisc_skb_cb *)skb->cb;
234 }
235
236 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
237 {
238 return &qdisc->q.lock;
239 }
240
241 static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
242 {
243 return qdisc->dev_queue->qdisc;
244 }
245
246 static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
247 {
248 return qdisc->dev_queue->qdisc_sleeping;
249 }
250
251 /* The qdisc root lock is a mechanism by which to top level
252 * of a qdisc tree can be locked from any qdisc node in the
253 * forest. This allows changing the configuration of some
254 * aspect of the qdisc tree while blocking out asynchronous
255 * qdisc access in the packet processing paths.
256 *
257 * It is only legal to do this when the root will not change
258 * on us. Otherwise we'll potentially lock the wrong qdisc
259 * root. This is enforced by holding the RTNL semaphore, which
260 * all users of this lock accessor must do.
261 */
262 static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
263 {
264 struct Qdisc *root = qdisc_root(qdisc);
265
266 ASSERT_RTNL();
267 return qdisc_lock(root);
268 }
269
270 static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
271 {
272 struct Qdisc *root = qdisc_root_sleeping(qdisc);
273
274 ASSERT_RTNL();
275 return qdisc_lock(root);
276 }
277
278 static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
279 {
280 return qdisc->dev_queue->dev;
281 }
282
283 static inline void sch_tree_lock(struct Qdisc *q)
284 {
285 spin_lock_bh(qdisc_root_sleeping_lock(q));
286 }
287
288 static inline void sch_tree_unlock(struct Qdisc *q)
289 {
290 spin_unlock_bh(qdisc_root_sleeping_lock(q));
291 }
292
293 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
294 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
295
296 extern struct Qdisc noop_qdisc;
297 extern struct Qdisc_ops noop_qdisc_ops;
298 extern struct Qdisc_ops pfifo_fast_ops;
299 extern struct Qdisc_ops mq_qdisc_ops;
300
301 struct Qdisc_class_common {
302 u32 classid;
303 struct hlist_node hnode;
304 };
305
306 struct Qdisc_class_hash {
307 struct hlist_head *hash;
308 unsigned int hashsize;
309 unsigned int hashmask;
310 unsigned int hashelems;
311 };
312
313 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
314 {
315 id ^= id >> 8;
316 id ^= id >> 4;
317 return id & mask;
318 }
319
320 static inline struct Qdisc_class_common *
321 qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
322 {
323 struct Qdisc_class_common *cl;
324 struct hlist_node *n;
325 unsigned int h;
326
327 h = qdisc_class_hash(id, hash->hashmask);
328 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
329 if (cl->classid == id)
330 return cl;
331 }
332 return NULL;
333 }
334
335 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
336 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
337 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
338 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
339 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
340
341 extern void dev_init_scheduler(struct net_device *dev);
342 extern void dev_shutdown(struct net_device *dev);
343 extern void dev_activate(struct net_device *dev);
344 extern void dev_deactivate(struct net_device *dev);
345 extern void dev_deactivate_many(struct list_head *head);
346 extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
347 struct Qdisc *qdisc);
348 extern void qdisc_reset(struct Qdisc *qdisc);
349 extern void qdisc_destroy(struct Qdisc *qdisc);
350 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
351 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
352 struct Qdisc_ops *ops);
353 extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
354 struct Qdisc_ops *ops, u32 parentid);
355 extern void __qdisc_calculate_pkt_len(struct sk_buff *skb,
356 const struct qdisc_size_table *stab);
357 extern void tcf_destroy(struct tcf_proto *tp);
358 extern void tcf_destroy_chain(struct tcf_proto **fl);
359
360 /* Reset all TX qdiscs greater then index of a device. */
361 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
362 {
363 struct Qdisc *qdisc;
364
365 for (; i < dev->num_tx_queues; i++) {
366 qdisc = netdev_get_tx_queue(dev, i)->qdisc;
367 if (qdisc) {
368 spin_lock_bh(qdisc_lock(qdisc));
369 qdisc_reset(qdisc);
370 spin_unlock_bh(qdisc_lock(qdisc));
371 }
372 }
373 }
374
375 static inline void qdisc_reset_all_tx(struct net_device *dev)
376 {
377 qdisc_reset_all_tx_gt(dev, 0);
378 }
379
380 /* Are all TX queues of the device empty? */
381 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
382 {
383 unsigned int i;
384 for (i = 0; i < dev->num_tx_queues; i++) {
385 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
386 const struct Qdisc *q = txq->qdisc;
387
388 if (q->q.qlen)
389 return false;
390 }
391 return true;
392 }
393
394 /* Are any of the TX qdiscs changing? */
395 static inline bool qdisc_tx_changing(struct net_device *dev)
396 {
397 unsigned int i;
398 for (i = 0; i < dev->num_tx_queues; i++) {
399 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
400 if (txq->qdisc != txq->qdisc_sleeping)
401 return true;
402 }
403 return false;
404 }
405
406 /* Is the device using the noop qdisc on all queues? */
407 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
408 {
409 unsigned int i;
410 for (i = 0; i < dev->num_tx_queues; i++) {
411 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
412 if (txq->qdisc != &noop_qdisc)
413 return false;
414 }
415 return true;
416 }
417
418 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
419 {
420 return qdisc_skb_cb(skb)->pkt_len;
421 }
422
423 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
424 enum net_xmit_qdisc_t {
425 __NET_XMIT_STOLEN = 0x00010000,
426 __NET_XMIT_BYPASS = 0x00020000,
427 };
428
429 #ifdef CONFIG_NET_CLS_ACT
430 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
431 #else
432 #define net_xmit_drop_count(e) (1)
433 #endif
434
435 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
436 const struct Qdisc *sch)
437 {
438 #ifdef CONFIG_NET_SCHED
439 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
440
441 if (stab)
442 __qdisc_calculate_pkt_len(skb, stab);
443 #endif
444 }
445
446 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
447 {
448 qdisc_calculate_pkt_len(skb, sch);
449 return sch->enqueue(skb, sch);
450 }
451
452 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
453 {
454 qdisc_skb_cb(skb)->pkt_len = skb->len;
455 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
456 }
457
458
459 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
460 const struct sk_buff *skb)
461 {
462 bstats->bytes += qdisc_pkt_len(skb);
463 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
464 }
465
466 static inline void qdisc_bstats_update(struct Qdisc *sch,
467 const struct sk_buff *skb)
468 {
469 bstats_update(&sch->bstats, skb);
470 }
471
472 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
473 struct sk_buff_head *list)
474 {
475 __skb_queue_tail(list, skb);
476 sch->qstats.backlog += qdisc_pkt_len(skb);
477
478 return NET_XMIT_SUCCESS;
479 }
480
481 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
482 {
483 return __qdisc_enqueue_tail(skb, sch, &sch->q);
484 }
485
486 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
487 struct sk_buff_head *list)
488 {
489 struct sk_buff *skb = __skb_dequeue(list);
490
491 if (likely(skb != NULL)) {
492 sch->qstats.backlog -= qdisc_pkt_len(skb);
493 qdisc_bstats_update(sch, skb);
494 }
495
496 return skb;
497 }
498
499 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
500 {
501 return __qdisc_dequeue_head(sch, &sch->q);
502 }
503
504 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
505 struct sk_buff_head *list)
506 {
507 struct sk_buff *skb = __skb_dequeue(list);
508
509 if (likely(skb != NULL)) {
510 unsigned int len = qdisc_pkt_len(skb);
511 sch->qstats.backlog -= len;
512 kfree_skb(skb);
513 return len;
514 }
515
516 return 0;
517 }
518
519 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
520 {
521 return __qdisc_queue_drop_head(sch, &sch->q);
522 }
523
524 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
525 struct sk_buff_head *list)
526 {
527 struct sk_buff *skb = __skb_dequeue_tail(list);
528
529 if (likely(skb != NULL))
530 sch->qstats.backlog -= qdisc_pkt_len(skb);
531
532 return skb;
533 }
534
535 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
536 {
537 return __qdisc_dequeue_tail(sch, &sch->q);
538 }
539
540 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
541 {
542 return skb_peek(&sch->q);
543 }
544
545 /* generic pseudo peek method for non-work-conserving qdisc */
546 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
547 {
548 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
549 if (!sch->gso_skb) {
550 sch->gso_skb = sch->dequeue(sch);
551 if (sch->gso_skb)
552 /* it's still part of the queue */
553 sch->q.qlen++;
554 }
555
556 return sch->gso_skb;
557 }
558
559 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
560 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
561 {
562 struct sk_buff *skb = sch->gso_skb;
563
564 if (skb) {
565 sch->gso_skb = NULL;
566 sch->q.qlen--;
567 } else {
568 skb = sch->dequeue(sch);
569 }
570
571 return skb;
572 }
573
574 static inline void __qdisc_reset_queue(struct Qdisc *sch,
575 struct sk_buff_head *list)
576 {
577 /*
578 * We do not know the backlog in bytes of this list, it
579 * is up to the caller to correct it
580 */
581 __skb_queue_purge(list);
582 }
583
584 static inline void qdisc_reset_queue(struct Qdisc *sch)
585 {
586 __qdisc_reset_queue(sch, &sch->q);
587 sch->qstats.backlog = 0;
588 }
589
590 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
591 struct sk_buff_head *list)
592 {
593 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
594
595 if (likely(skb != NULL)) {
596 unsigned int len = qdisc_pkt_len(skb);
597 kfree_skb(skb);
598 return len;
599 }
600
601 return 0;
602 }
603
604 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
605 {
606 return __qdisc_queue_drop(sch, &sch->q);
607 }
608
609 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
610 {
611 kfree_skb(skb);
612 sch->qstats.drops++;
613
614 return NET_XMIT_DROP;
615 }
616
617 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
618 {
619 sch->qstats.drops++;
620
621 #ifdef CONFIG_NET_CLS_ACT
622 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
623 goto drop;
624
625 return NET_XMIT_SUCCESS;
626
627 drop:
628 #endif
629 kfree_skb(skb);
630 return NET_XMIT_DROP;
631 }
632
633 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
634 long it will take to send a packet given its size.
635 */
636 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
637 {
638 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
639 if (slot < 0)
640 slot = 0;
641 slot >>= rtab->rate.cell_log;
642 if (slot > 255)
643 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
644 return rtab->data[slot];
645 }
646
647 #ifdef CONFIG_NET_CLS_ACT
648 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
649 int action)
650 {
651 struct sk_buff *n;
652
653 n = skb_clone(skb, gfp_mask);
654
655 if (n) {
656 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
657 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
658 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
659 }
660 return n;
661 }
662 #endif
663
664 #endif
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