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Merge branches 'turbostat' and 'x86_energy_perf_policy' into tools
[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 struct tc_ratespec rate;
20 u32 data[256];
21 struct qdisc_rate_table *next;
22 int refcnt;
23 };
24
25 enum qdisc_state_t {
26 __QDISC_STATE_SCHED,
27 __QDISC_STATE_DEACTIVATED,
28 };
29
30 /*
31 * following bits are only changed while qdisc lock is held
32 */
33 enum qdisc___state_t {
34 __QDISC___STATE_RUNNING,
35 };
36
37 struct qdisc_size_table {
38 struct list_head list;
39 struct tc_sizespec szopts;
40 int refcnt;
41 u16 data[];
42 };
43
44 struct Qdisc {
45 int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
46 struct sk_buff * (*dequeue)(struct Qdisc *dev);
47 unsigned flags;
48 #define TCQ_F_BUILTIN 1
49 #define TCQ_F_THROTTLED 2
50 #define TCQ_F_INGRESS 4
51 #define TCQ_F_CAN_BYPASS 8
52 #define TCQ_F_MQROOT 16
53 #define TCQ_F_WARN_NONWC (1 << 16)
54 int padded;
55 struct Qdisc_ops *ops;
56 struct qdisc_size_table *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 long __state;
82 struct gnet_stats_queue qstats;
83 struct rcu_head rcu_head;
84 spinlock_t busylock;
85 };
86
87 static inline bool qdisc_is_running(struct Qdisc *qdisc)
88 {
89 return test_bit(__QDISC___STATE_RUNNING, &qdisc->__state);
90 }
91
92 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
93 {
94 return !__test_and_set_bit(__QDISC___STATE_RUNNING, &qdisc->__state);
95 }
96
97 static inline void qdisc_run_end(struct Qdisc *qdisc)
98 {
99 __clear_bit(__QDISC___STATE_RUNNING, &qdisc->__state);
100 }
101
102 struct Qdisc_class_ops {
103 /* Child qdisc manipulation */
104 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
105 int (*graft)(struct Qdisc *, unsigned long cl,
106 struct Qdisc *, struct Qdisc **);
107 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
108 void (*qlen_notify)(struct Qdisc *, unsigned long);
109
110 /* Class manipulation routines */
111 unsigned long (*get)(struct Qdisc *, u32 classid);
112 void (*put)(struct Qdisc *, unsigned long);
113 int (*change)(struct Qdisc *, u32, u32,
114 struct nlattr **, unsigned long *);
115 int (*delete)(struct Qdisc *, unsigned long);
116 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
117
118 /* Filter manipulation */
119 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
120 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
121 u32 classid);
122 void (*unbind_tcf)(struct Qdisc *, unsigned long);
123
124 /* rtnetlink specific */
125 int (*dump)(struct Qdisc *, unsigned long,
126 struct sk_buff *skb, struct tcmsg*);
127 int (*dump_stats)(struct Qdisc *, unsigned long,
128 struct gnet_dump *);
129 };
130
131 struct Qdisc_ops {
132 struct Qdisc_ops *next;
133 const struct Qdisc_class_ops *cl_ops;
134 char id[IFNAMSIZ];
135 int priv_size;
136
137 int (*enqueue)(struct sk_buff *, struct Qdisc *);
138 struct sk_buff * (*dequeue)(struct Qdisc *);
139 struct sk_buff * (*peek)(struct Qdisc *);
140 unsigned int (*drop)(struct Qdisc *);
141
142 int (*init)(struct Qdisc *, struct nlattr *arg);
143 void (*reset)(struct Qdisc *);
144 void (*destroy)(struct Qdisc *);
145 int (*change)(struct Qdisc *, struct nlattr *arg);
146 void (*attach)(struct Qdisc *);
147
148 int (*dump)(struct Qdisc *, struct sk_buff *);
149 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
150
151 struct module *owner;
152 };
153
154
155 struct tcf_result {
156 unsigned long class;
157 u32 classid;
158 };
159
160 struct tcf_proto_ops {
161 struct tcf_proto_ops *next;
162 char kind[IFNAMSIZ];
163
164 int (*classify)(struct sk_buff*, struct tcf_proto*,
165 struct tcf_result *);
166 int (*init)(struct tcf_proto*);
167 void (*destroy)(struct tcf_proto*);
168
169 unsigned long (*get)(struct tcf_proto*, u32 handle);
170 void (*put)(struct tcf_proto*, unsigned long);
171 int (*change)(struct tcf_proto*, unsigned long,
172 u32 handle, struct nlattr **,
173 unsigned long *);
174 int (*delete)(struct tcf_proto*, unsigned long);
175 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
176
177 /* rtnetlink specific */
178 int (*dump)(struct tcf_proto*, unsigned long,
179 struct sk_buff *skb, struct tcmsg*);
180
181 struct module *owner;
182 };
183
184 struct tcf_proto {
185 /* Fast access part */
186 struct tcf_proto *next;
187 void *root;
188 int (*classify)(struct sk_buff*, struct tcf_proto*,
189 struct tcf_result *);
190 __be16 protocol;
191
192 /* All the rest */
193 u32 prio;
194 u32 classid;
195 struct Qdisc *q;
196 void *data;
197 struct tcf_proto_ops *ops;
198 };
199
200 struct qdisc_skb_cb {
201 unsigned int pkt_len;
202 char data[];
203 };
204
205 static inline int qdisc_qlen(struct Qdisc *q)
206 {
207 return q->q.qlen;
208 }
209
210 static inline struct qdisc_skb_cb *qdisc_skb_cb(struct sk_buff *skb)
211 {
212 return (struct qdisc_skb_cb *)skb->cb;
213 }
214
215 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
216 {
217 return &qdisc->q.lock;
218 }
219
220 static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
221 {
222 return qdisc->dev_queue->qdisc;
223 }
224
225 static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
226 {
227 return qdisc->dev_queue->qdisc_sleeping;
228 }
229
230 /* The qdisc root lock is a mechanism by which to top level
231 * of a qdisc tree can be locked from any qdisc node in the
232 * forest. This allows changing the configuration of some
233 * aspect of the qdisc tree while blocking out asynchronous
234 * qdisc access in the packet processing paths.
235 *
236 * It is only legal to do this when the root will not change
237 * on us. Otherwise we'll potentially lock the wrong qdisc
238 * root. This is enforced by holding the RTNL semaphore, which
239 * all users of this lock accessor must do.
240 */
241 static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
242 {
243 struct Qdisc *root = qdisc_root(qdisc);
244
245 ASSERT_RTNL();
246 return qdisc_lock(root);
247 }
248
249 static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
250 {
251 struct Qdisc *root = qdisc_root_sleeping(qdisc);
252
253 ASSERT_RTNL();
254 return qdisc_lock(root);
255 }
256
257 static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
258 {
259 return qdisc->dev_queue->dev;
260 }
261
262 static inline void sch_tree_lock(struct Qdisc *q)
263 {
264 spin_lock_bh(qdisc_root_sleeping_lock(q));
265 }
266
267 static inline void sch_tree_unlock(struct Qdisc *q)
268 {
269 spin_unlock_bh(qdisc_root_sleeping_lock(q));
270 }
271
272 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
273 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
274
275 extern struct Qdisc noop_qdisc;
276 extern struct Qdisc_ops noop_qdisc_ops;
277 extern struct Qdisc_ops pfifo_fast_ops;
278 extern struct Qdisc_ops mq_qdisc_ops;
279
280 struct Qdisc_class_common {
281 u32 classid;
282 struct hlist_node hnode;
283 };
284
285 struct Qdisc_class_hash {
286 struct hlist_head *hash;
287 unsigned int hashsize;
288 unsigned int hashmask;
289 unsigned int hashelems;
290 };
291
292 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
293 {
294 id ^= id >> 8;
295 id ^= id >> 4;
296 return id & mask;
297 }
298
299 static inline struct Qdisc_class_common *
300 qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
301 {
302 struct Qdisc_class_common *cl;
303 struct hlist_node *n;
304 unsigned int h;
305
306 h = qdisc_class_hash(id, hash->hashmask);
307 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
308 if (cl->classid == id)
309 return cl;
310 }
311 return NULL;
312 }
313
314 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
315 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
316 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
317 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
318 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
319
320 extern void dev_init_scheduler(struct net_device *dev);
321 extern void dev_shutdown(struct net_device *dev);
322 extern void dev_activate(struct net_device *dev);
323 extern void dev_deactivate(struct net_device *dev);
324 extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
325 struct Qdisc *qdisc);
326 extern void qdisc_reset(struct Qdisc *qdisc);
327 extern void qdisc_destroy(struct Qdisc *qdisc);
328 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
329 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
330 struct Qdisc_ops *ops);
331 extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
332 struct Qdisc_ops *ops, u32 parentid);
333 extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
334 struct qdisc_size_table *stab);
335 extern void tcf_destroy(struct tcf_proto *tp);
336 extern void tcf_destroy_chain(struct tcf_proto **fl);
337
338 /* Reset all TX qdiscs greater then index of a device. */
339 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
340 {
341 struct Qdisc *qdisc;
342
343 for (; i < dev->num_tx_queues; i++) {
344 qdisc = netdev_get_tx_queue(dev, i)->qdisc;
345 if (qdisc) {
346 spin_lock_bh(qdisc_lock(qdisc));
347 qdisc_reset(qdisc);
348 spin_unlock_bh(qdisc_lock(qdisc));
349 }
350 }
351 }
352
353 static inline void qdisc_reset_all_tx(struct net_device *dev)
354 {
355 qdisc_reset_all_tx_gt(dev, 0);
356 }
357
358 /* Are all TX queues of the device empty? */
359 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
360 {
361 unsigned int i;
362 for (i = 0; i < dev->num_tx_queues; i++) {
363 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
364 const struct Qdisc *q = txq->qdisc;
365
366 if (q->q.qlen)
367 return false;
368 }
369 return true;
370 }
371
372 /* Are any of the TX qdiscs changing? */
373 static inline bool qdisc_tx_changing(struct net_device *dev)
374 {
375 unsigned int i;
376 for (i = 0; i < dev->num_tx_queues; i++) {
377 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
378 if (txq->qdisc != txq->qdisc_sleeping)
379 return true;
380 }
381 return false;
382 }
383
384 /* Is the device using the noop qdisc on all queues? */
385 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
386 {
387 unsigned int i;
388 for (i = 0; i < dev->num_tx_queues; i++) {
389 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
390 if (txq->qdisc != &noop_qdisc)
391 return false;
392 }
393 return true;
394 }
395
396 static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
397 {
398 return qdisc_skb_cb(skb)->pkt_len;
399 }
400
401 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
402 enum net_xmit_qdisc_t {
403 __NET_XMIT_STOLEN = 0x00010000,
404 __NET_XMIT_BYPASS = 0x00020000,
405 };
406
407 #ifdef CONFIG_NET_CLS_ACT
408 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
409 #else
410 #define net_xmit_drop_count(e) (1)
411 #endif
412
413 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
414 {
415 #ifdef CONFIG_NET_SCHED
416 if (sch->stab)
417 qdisc_calculate_pkt_len(skb, sch->stab);
418 #endif
419 return sch->enqueue(skb, sch);
420 }
421
422 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
423 {
424 qdisc_skb_cb(skb)->pkt_len = skb->len;
425 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
426 }
427
428 static inline void __qdisc_update_bstats(struct Qdisc *sch, unsigned int len)
429 {
430 sch->bstats.bytes += len;
431 sch->bstats.packets++;
432 }
433
434 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
435 struct sk_buff_head *list)
436 {
437 __skb_queue_tail(list, skb);
438 sch->qstats.backlog += qdisc_pkt_len(skb);
439 __qdisc_update_bstats(sch, qdisc_pkt_len(skb));
440
441 return NET_XMIT_SUCCESS;
442 }
443
444 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
445 {
446 return __qdisc_enqueue_tail(skb, sch, &sch->q);
447 }
448
449 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
450 struct sk_buff_head *list)
451 {
452 struct sk_buff *skb = __skb_dequeue(list);
453
454 if (likely(skb != NULL))
455 sch->qstats.backlog -= qdisc_pkt_len(skb);
456
457 return skb;
458 }
459
460 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
461 {
462 return __qdisc_dequeue_head(sch, &sch->q);
463 }
464
465 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
466 struct sk_buff_head *list)
467 {
468 struct sk_buff *skb = __qdisc_dequeue_head(sch, list);
469
470 if (likely(skb != NULL)) {
471 unsigned int len = qdisc_pkt_len(skb);
472 kfree_skb(skb);
473 return len;
474 }
475
476 return 0;
477 }
478
479 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
480 {
481 return __qdisc_queue_drop_head(sch, &sch->q);
482 }
483
484 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
485 struct sk_buff_head *list)
486 {
487 struct sk_buff *skb = __skb_dequeue_tail(list);
488
489 if (likely(skb != NULL))
490 sch->qstats.backlog -= qdisc_pkt_len(skb);
491
492 return skb;
493 }
494
495 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
496 {
497 return __qdisc_dequeue_tail(sch, &sch->q);
498 }
499
500 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
501 {
502 return skb_peek(&sch->q);
503 }
504
505 /* generic pseudo peek method for non-work-conserving qdisc */
506 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
507 {
508 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
509 if (!sch->gso_skb) {
510 sch->gso_skb = sch->dequeue(sch);
511 if (sch->gso_skb)
512 /* it's still part of the queue */
513 sch->q.qlen++;
514 }
515
516 return sch->gso_skb;
517 }
518
519 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
520 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
521 {
522 struct sk_buff *skb = sch->gso_skb;
523
524 if (skb) {
525 sch->gso_skb = NULL;
526 sch->q.qlen--;
527 } else {
528 skb = sch->dequeue(sch);
529 }
530
531 return skb;
532 }
533
534 static inline void __qdisc_reset_queue(struct Qdisc *sch,
535 struct sk_buff_head *list)
536 {
537 /*
538 * We do not know the backlog in bytes of this list, it
539 * is up to the caller to correct it
540 */
541 __skb_queue_purge(list);
542 }
543
544 static inline void qdisc_reset_queue(struct Qdisc *sch)
545 {
546 __qdisc_reset_queue(sch, &sch->q);
547 sch->qstats.backlog = 0;
548 }
549
550 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
551 struct sk_buff_head *list)
552 {
553 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
554
555 if (likely(skb != NULL)) {
556 unsigned int len = qdisc_pkt_len(skb);
557 kfree_skb(skb);
558 return len;
559 }
560
561 return 0;
562 }
563
564 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
565 {
566 return __qdisc_queue_drop(sch, &sch->q);
567 }
568
569 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
570 {
571 kfree_skb(skb);
572 sch->qstats.drops++;
573
574 return NET_XMIT_DROP;
575 }
576
577 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
578 {
579 sch->qstats.drops++;
580
581 #ifdef CONFIG_NET_CLS_ACT
582 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
583 goto drop;
584
585 return NET_XMIT_SUCCESS;
586
587 drop:
588 #endif
589 kfree_skb(skb);
590 return NET_XMIT_DROP;
591 }
592
593 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
594 long it will take to send a packet given its size.
595 */
596 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
597 {
598 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
599 if (slot < 0)
600 slot = 0;
601 slot >>= rtab->rate.cell_log;
602 if (slot > 255)
603 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
604 return rtab->data[slot];
605 }
606
607 #ifdef CONFIG_NET_CLS_ACT
608 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
609 int action)
610 {
611 struct sk_buff *n;
612
613 n = skb_clone(skb, gfp_mask);
614
615 if (n) {
616 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
617 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
618 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
619 }
620 return n;
621 }
622 #endif
623
624 #endif
Linux kernel - Deliverables
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