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[deliverable/linux.git] / include / net / sch_generic.h
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/module.h>
8 #include <linux/pkt_sched.h>
9 #include <linux/pkt_cls.h>
10 #include <net/gen_stats.h>
11 #include <net/rtnetlink.h>
12
13 struct Qdisc_ops;
14 struct qdisc_walker;
15 struct tcf_walker;
16 struct module;
17
18 struct qdisc_rate_table
19 {
20 struct tc_ratespec rate;
21 u32 data[256];
22 struct qdisc_rate_table *next;
23 int refcnt;
24 };
25
26 enum qdisc_state_t
27 {
28 __QDISC_STATE_RUNNING,
29 __QDISC_STATE_SCHED,
30 __QDISC_STATE_DEACTIVATED,
31 };
32
33 struct qdisc_size_table {
34 struct list_head list;
35 struct tc_sizespec szopts;
36 int refcnt;
37 u16 data[];
38 };
39
40 struct Qdisc
41 {
42 int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
43 struct sk_buff * (*dequeue)(struct Qdisc *dev);
44 unsigned flags;
45 #define TCQ_F_BUILTIN 1
46 #define TCQ_F_THROTTLED 2
47 #define TCQ_F_INGRESS 4
48 int padded;
49 struct Qdisc_ops *ops;
50 struct qdisc_size_table *stab;
51 u32 handle;
52 u32 parent;
53 atomic_t refcnt;
54 unsigned long state;
55 struct sk_buff *gso_skb;
56 struct sk_buff_head requeue;
57 struct sk_buff_head q;
58 struct netdev_queue *dev_queue;
59 struct Qdisc *next_sched;
60 struct list_head list;
61
62 struct gnet_stats_basic bstats;
63 struct gnet_stats_queue qstats;
64 struct gnet_stats_rate_est rate_est;
65 int (*reshape_fail)(struct sk_buff *skb,
66 struct Qdisc *q);
67
68 void *u32_node;
69
70 /* This field is deprecated, but it is still used by CBQ
71 * and it will live until better solution will be invented.
72 */
73 struct Qdisc *__parent;
74 };
75
76 struct Qdisc_class_ops
77 {
78 /* Child qdisc manipulation */
79 int (*graft)(struct Qdisc *, unsigned long cl,
80 struct Qdisc *, struct Qdisc **);
81 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
82 void (*qlen_notify)(struct Qdisc *, unsigned long);
83
84 /* Class manipulation routines */
85 unsigned long (*get)(struct Qdisc *, u32 classid);
86 void (*put)(struct Qdisc *, unsigned long);
87 int (*change)(struct Qdisc *, u32, u32,
88 struct nlattr **, unsigned long *);
89 int (*delete)(struct Qdisc *, unsigned long);
90 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
91
92 /* Filter manipulation */
93 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
94 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
95 u32 classid);
96 void (*unbind_tcf)(struct Qdisc *, unsigned long);
97
98 /* rtnetlink specific */
99 int (*dump)(struct Qdisc *, unsigned long,
100 struct sk_buff *skb, struct tcmsg*);
101 int (*dump_stats)(struct Qdisc *, unsigned long,
102 struct gnet_dump *);
103 };
104
105 struct Qdisc_ops
106 {
107 struct Qdisc_ops *next;
108 const struct Qdisc_class_ops *cl_ops;
109 char id[IFNAMSIZ];
110 int priv_size;
111
112 int (*enqueue)(struct sk_buff *, struct Qdisc *);
113 struct sk_buff * (*dequeue)(struct Qdisc *);
114 struct sk_buff * (*peek)(struct Qdisc *);
115 int (*requeue)(struct sk_buff *, struct Qdisc *);
116 unsigned int (*drop)(struct Qdisc *);
117
118 int (*init)(struct Qdisc *, struct nlattr *arg);
119 void (*reset)(struct Qdisc *);
120 void (*destroy)(struct Qdisc *);
121 int (*change)(struct Qdisc *, struct nlattr *arg);
122
123 int (*dump)(struct Qdisc *, struct sk_buff *);
124 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
125
126 struct module *owner;
127 };
128
129
130 struct tcf_result
131 {
132 unsigned long class;
133 u32 classid;
134 };
135
136 struct tcf_proto_ops
137 {
138 struct tcf_proto_ops *next;
139 char kind[IFNAMSIZ];
140
141 int (*classify)(struct sk_buff*, struct tcf_proto*,
142 struct tcf_result *);
143 int (*init)(struct tcf_proto*);
144 void (*destroy)(struct tcf_proto*);
145
146 unsigned long (*get)(struct tcf_proto*, u32 handle);
147 void (*put)(struct tcf_proto*, unsigned long);
148 int (*change)(struct tcf_proto*, unsigned long,
149 u32 handle, struct nlattr **,
150 unsigned long *);
151 int (*delete)(struct tcf_proto*, unsigned long);
152 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
153
154 /* rtnetlink specific */
155 int (*dump)(struct tcf_proto*, unsigned long,
156 struct sk_buff *skb, struct tcmsg*);
157
158 struct module *owner;
159 };
160
161 struct tcf_proto
162 {
163 /* Fast access part */
164 struct tcf_proto *next;
165 void *root;
166 int (*classify)(struct sk_buff*, struct tcf_proto*,
167 struct tcf_result *);
168 __be16 protocol;
169
170 /* All the rest */
171 u32 prio;
172 u32 classid;
173 struct Qdisc *q;
174 void *data;
175 struct tcf_proto_ops *ops;
176 };
177
178 struct qdisc_skb_cb {
179 unsigned int pkt_len;
180 char data[];
181 };
182
183 static inline struct qdisc_skb_cb *qdisc_skb_cb(struct sk_buff *skb)
184 {
185 return (struct qdisc_skb_cb *)skb->cb;
186 }
187
188 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
189 {
190 return &qdisc->q.lock;
191 }
192
193 static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
194 {
195 return qdisc->dev_queue->qdisc;
196 }
197
198 static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
199 {
200 return qdisc->dev_queue->qdisc_sleeping;
201 }
202
203 /* The qdisc root lock is a mechanism by which to top level
204 * of a qdisc tree can be locked from any qdisc node in the
205 * forest. This allows changing the configuration of some
206 * aspect of the qdisc tree while blocking out asynchronous
207 * qdisc access in the packet processing paths.
208 *
209 * It is only legal to do this when the root will not change
210 * on us. Otherwise we'll potentially lock the wrong qdisc
211 * root. This is enforced by holding the RTNL semaphore, which
212 * all users of this lock accessor must do.
213 */
214 static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
215 {
216 struct Qdisc *root = qdisc_root(qdisc);
217
218 ASSERT_RTNL();
219 return qdisc_lock(root);
220 }
221
222 static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
223 {
224 struct Qdisc *root = qdisc_root_sleeping(qdisc);
225
226 ASSERT_RTNL();
227 return qdisc_lock(root);
228 }
229
230 static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
231 {
232 return qdisc->dev_queue->dev;
233 }
234
235 static inline void sch_tree_lock(struct Qdisc *q)
236 {
237 spin_lock_bh(qdisc_root_sleeping_lock(q));
238 }
239
240 static inline void sch_tree_unlock(struct Qdisc *q)
241 {
242 spin_unlock_bh(qdisc_root_sleeping_lock(q));
243 }
244
245 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
246 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
247
248 extern struct Qdisc noop_qdisc;
249 extern struct Qdisc_ops noop_qdisc_ops;
250
251 struct Qdisc_class_common
252 {
253 u32 classid;
254 struct hlist_node hnode;
255 };
256
257 struct Qdisc_class_hash
258 {
259 struct hlist_head *hash;
260 unsigned int hashsize;
261 unsigned int hashmask;
262 unsigned int hashelems;
263 };
264
265 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
266 {
267 id ^= id >> 8;
268 id ^= id >> 4;
269 return id & mask;
270 }
271
272 static inline struct Qdisc_class_common *
273 qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
274 {
275 struct Qdisc_class_common *cl;
276 struct hlist_node *n;
277 unsigned int h;
278
279 h = qdisc_class_hash(id, hash->hashmask);
280 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
281 if (cl->classid == id)
282 return cl;
283 }
284 return NULL;
285 }
286
287 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
288 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
289 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
290 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
291 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
292
293 extern void dev_init_scheduler(struct net_device *dev);
294 extern void dev_shutdown(struct net_device *dev);
295 extern void dev_activate(struct net_device *dev);
296 extern void dev_deactivate(struct net_device *dev);
297 extern void qdisc_reset(struct Qdisc *qdisc);
298 extern void qdisc_destroy(struct Qdisc *qdisc);
299 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
300 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
301 struct Qdisc_ops *ops);
302 extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
303 struct netdev_queue *dev_queue,
304 struct Qdisc_ops *ops, u32 parentid);
305 extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
306 struct qdisc_size_table *stab);
307 extern void tcf_destroy(struct tcf_proto *tp);
308 extern void tcf_destroy_chain(struct tcf_proto **fl);
309
310 /* Reset all TX qdiscs of a device. */
311 static inline void qdisc_reset_all_tx(struct net_device *dev)
312 {
313 unsigned int i;
314 for (i = 0; i < dev->num_tx_queues; i++)
315 qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
316 }
317
318 /* Are all TX queues of the device empty? */
319 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
320 {
321 unsigned int i;
322 for (i = 0; i < dev->num_tx_queues; i++) {
323 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
324 const struct Qdisc *q = txq->qdisc;
325
326 if (q->q.qlen)
327 return false;
328 }
329 return true;
330 }
331
332 /* Are any of the TX qdiscs changing? */
333 static inline bool qdisc_tx_changing(struct net_device *dev)
334 {
335 unsigned int i;
336 for (i = 0; i < dev->num_tx_queues; i++) {
337 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
338 if (txq->qdisc != txq->qdisc_sleeping)
339 return true;
340 }
341 return false;
342 }
343
344 /* Is the device using the noop qdisc on all queues? */
345 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
346 {
347 unsigned int i;
348 for (i = 0; i < dev->num_tx_queues; i++) {
349 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
350 if (txq->qdisc != &noop_qdisc)
351 return false;
352 }
353 return true;
354 }
355
356 static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
357 {
358 return qdisc_skb_cb(skb)->pkt_len;
359 }
360
361 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
362 enum net_xmit_qdisc_t {
363 __NET_XMIT_STOLEN = 0x00010000,
364 __NET_XMIT_BYPASS = 0x00020000,
365 };
366
367 #ifdef CONFIG_NET_CLS_ACT
368 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
369 #else
370 #define net_xmit_drop_count(e) (1)
371 #endif
372
373 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
374 {
375 #ifdef CONFIG_NET_SCHED
376 if (sch->stab)
377 qdisc_calculate_pkt_len(skb, sch->stab);
378 #endif
379 return sch->enqueue(skb, sch);
380 }
381
382 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
383 {
384 qdisc_skb_cb(skb)->pkt_len = skb->len;
385 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
386 }
387
388 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
389 struct sk_buff_head *list)
390 {
391 __skb_queue_tail(list, skb);
392 sch->qstats.backlog += qdisc_pkt_len(skb);
393 sch->bstats.bytes += qdisc_pkt_len(skb);
394 sch->bstats.packets++;
395
396 return NET_XMIT_SUCCESS;
397 }
398
399 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
400 {
401 return __qdisc_enqueue_tail(skb, sch, &sch->q);
402 }
403
404 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
405 struct sk_buff_head *list)
406 {
407 struct sk_buff *skb = __skb_dequeue(list);
408
409 if (likely(skb != NULL))
410 sch->qstats.backlog -= qdisc_pkt_len(skb);
411
412 return skb;
413 }
414
415 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
416 {
417 return __qdisc_dequeue_head(sch, &sch->q);
418 }
419
420 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
421 struct sk_buff_head *list)
422 {
423 struct sk_buff *skb = __skb_dequeue_tail(list);
424
425 if (likely(skb != NULL))
426 sch->qstats.backlog -= qdisc_pkt_len(skb);
427
428 return skb;
429 }
430
431 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
432 {
433 return __qdisc_dequeue_tail(sch, &sch->q);
434 }
435
436 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
437 {
438 return skb_peek(&sch->q);
439 }
440
441 /* generic pseudo peek method for non-work-conserving qdisc */
442 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
443 {
444 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
445 if (!sch->gso_skb) {
446 sch->gso_skb = sch->dequeue(sch);
447 if (sch->gso_skb)
448 /* it's still part of the queue */
449 sch->q.qlen++;
450 }
451
452 return sch->gso_skb;
453 }
454
455 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
456 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
457 {
458 struct sk_buff *skb = sch->gso_skb;
459
460 if (skb) {
461 sch->gso_skb = NULL;
462 sch->q.qlen--;
463 } else {
464 skb = sch->dequeue(sch);
465 }
466
467 return skb;
468 }
469
470 static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch,
471 struct sk_buff_head *list)
472 {
473 __skb_queue_head(list, skb);
474 sch->qstats.backlog += qdisc_pkt_len(skb);
475 sch->qstats.requeues++;
476
477 return NET_XMIT_SUCCESS;
478 }
479
480 static inline int qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch)
481 {
482 return __qdisc_requeue(skb, sch, &sch->q);
483 }
484
485 static inline void __qdisc_reset_queue(struct Qdisc *sch,
486 struct sk_buff_head *list)
487 {
488 /*
489 * We do not know the backlog in bytes of this list, it
490 * is up to the caller to correct it
491 */
492 __skb_queue_purge(list);
493 }
494
495 static inline void qdisc_reset_queue(struct Qdisc *sch)
496 {
497 __qdisc_reset_queue(sch, &sch->q);
498 sch->qstats.backlog = 0;
499 }
500
501 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
502 struct sk_buff_head *list)
503 {
504 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
505
506 if (likely(skb != NULL)) {
507 unsigned int len = qdisc_pkt_len(skb);
508 kfree_skb(skb);
509 return len;
510 }
511
512 return 0;
513 }
514
515 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
516 {
517 return __qdisc_queue_drop(sch, &sch->q);
518 }
519
520 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
521 {
522 kfree_skb(skb);
523 sch->qstats.drops++;
524
525 return NET_XMIT_DROP;
526 }
527
528 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
529 {
530 sch->qstats.drops++;
531
532 #ifdef CONFIG_NET_CLS_ACT
533 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
534 goto drop;
535
536 return NET_XMIT_SUCCESS;
537
538 drop:
539 #endif
540 kfree_skb(skb);
541 return NET_XMIT_DROP;
542 }
543
544 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
545 long it will take to send a packet given its size.
546 */
547 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
548 {
549 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
550 if (slot < 0)
551 slot = 0;
552 slot >>= rtab->rate.cell_log;
553 if (slot > 255)
554 return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
555 return rtab->data[slot];
556 }
557
558 #ifdef CONFIG_NET_CLS_ACT
559 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
560 {
561 struct sk_buff *n = skb_clone(skb, gfp_mask);
562
563 if (n) {
564 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
565 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
566 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
567 }
568 return n;
569 }
570 #endif
571
572 #endif
Linux kernel - Deliverables
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