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usb: musb: fix bug in musb_schedule
[linux-ginger.git] / include / net / sch_generic.h
blob3fe49d808957309f29f1cb9532892fc06e936f2e
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 int (*requeue)(struct sk_buff *, struct Qdisc *);
115 unsigned int (*drop)(struct Qdisc *);
116
117 int (*init)(struct Qdisc *, struct nlattr *arg);
118 void (*reset)(struct Qdisc *);
119 void (*destroy)(struct Qdisc *);
120 int (*change)(struct Qdisc *, struct nlattr *arg);
121
122 int (*dump)(struct Qdisc *, struct sk_buff *);
123 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
124
125 struct module *owner;
126 };
127
128
129 struct tcf_result
130 {
131 unsigned long class;
132 u32 classid;
133 };
134
135 struct tcf_proto_ops
136 {
137 struct tcf_proto_ops *next;
138 char kind[IFNAMSIZ];
139
140 int (*classify)(struct sk_buff*, struct tcf_proto*,
141 struct tcf_result *);
142 int (*init)(struct tcf_proto*);
143 void (*destroy)(struct tcf_proto*);
144
145 unsigned long (*get)(struct tcf_proto*, u32 handle);
146 void (*put)(struct tcf_proto*, unsigned long);
147 int (*change)(struct tcf_proto*, unsigned long,
148 u32 handle, struct nlattr **,
149 unsigned long *);
150 int (*delete)(struct tcf_proto*, unsigned long);
151 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
152
153 /* rtnetlink specific */
154 int (*dump)(struct tcf_proto*, unsigned long,
155 struct sk_buff *skb, struct tcmsg*);
156
157 struct module *owner;
158 };
159
160 struct tcf_proto
161 {
162 /* Fast access part */
163 struct tcf_proto *next;
164 void *root;
165 int (*classify)(struct sk_buff*, struct tcf_proto*,
166 struct tcf_result *);
167 __be16 protocol;
168
169 /* All the rest */
170 u32 prio;
171 u32 classid;
172 struct Qdisc *q;
173 void *data;
174 struct tcf_proto_ops *ops;
175 };
176
177 struct qdisc_skb_cb {
178 unsigned int pkt_len;
179 char data[];
180 };
181
182 static inline struct qdisc_skb_cb *qdisc_skb_cb(struct sk_buff *skb)
183 {
184 return (struct qdisc_skb_cb *)skb->cb;
185 }
186
187 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
188 {
189 return &qdisc->q.lock;
190 }
191
192 static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
193 {
194 return qdisc->dev_queue->qdisc;
195 }
196
197 static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
198 {
199 return qdisc->dev_queue->qdisc_sleeping;
200 }
201
202 /* The qdisc root lock is a mechanism by which to top level
203 * of a qdisc tree can be locked from any qdisc node in the
204 * forest. This allows changing the configuration of some
205 * aspect of the qdisc tree while blocking out asynchronous
206 * qdisc access in the packet processing paths.
207 *
208 * It is only legal to do this when the root will not change
209 * on us. Otherwise we'll potentially lock the wrong qdisc
210 * root. This is enforced by holding the RTNL semaphore, which
211 * all users of this lock accessor must do.
212 */
213 static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
214 {
215 struct Qdisc *root = qdisc_root(qdisc);
216
217 ASSERT_RTNL();
218 return qdisc_lock(root);
219 }
220
221 static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
222 {
223 struct Qdisc *root = qdisc_root_sleeping(qdisc);
224
225 ASSERT_RTNL();
226 return qdisc_lock(root);
227 }
228
229 static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
230 {
231 return qdisc->dev_queue->dev;
232 }
233
234 static inline void sch_tree_lock(struct Qdisc *q)
235 {
236 spin_lock_bh(qdisc_root_sleeping_lock(q));
237 }
238
239 static inline void sch_tree_unlock(struct Qdisc *q)
240 {
241 spin_unlock_bh(qdisc_root_sleeping_lock(q));
242 }
243
244 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
245 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
246
247 extern struct Qdisc noop_qdisc;
248 extern struct Qdisc_ops noop_qdisc_ops;
249
250 struct Qdisc_class_common
251 {
252 u32 classid;
253 struct hlist_node hnode;
254 };
255
256 struct Qdisc_class_hash
257 {
258 struct hlist_head *hash;
259 unsigned int hashsize;
260 unsigned int hashmask;
261 unsigned int hashelems;
262 };
263
264 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
265 {
266 id ^= id >> 8;
267 id ^= id >> 4;
268 return id & mask;
269 }
270
271 static inline struct Qdisc_class_common *
272 qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
273 {
274 struct Qdisc_class_common *cl;
275 struct hlist_node *n;
276 unsigned int h;
277
278 h = qdisc_class_hash(id, hash->hashmask);
279 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
280 if (cl->classid == id)
281 return cl;
282 }
283 return NULL;
284 }
285
286 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
287 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
288 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
289 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
290 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
291
292 extern void dev_init_scheduler(struct net_device *dev);
293 extern void dev_shutdown(struct net_device *dev);
294 extern void dev_activate(struct net_device *dev);
295 extern void dev_deactivate(struct net_device *dev);
296 extern void qdisc_reset(struct Qdisc *qdisc);
297 extern void qdisc_destroy(struct Qdisc *qdisc);
298 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
299 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
300 struct Qdisc_ops *ops);
301 extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
302 struct netdev_queue *dev_queue,
303 struct Qdisc_ops *ops, u32 parentid);
304 extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
305 struct qdisc_size_table *stab);
306 extern void tcf_destroy(struct tcf_proto *tp);
307 extern void tcf_destroy_chain(struct tcf_proto **fl);
308
309 /* Reset all TX qdiscs of a device. */
310 static inline void qdisc_reset_all_tx(struct net_device *dev)
311 {
312 unsigned int i;
313 for (i = 0; i < dev->num_tx_queues; i++)
314 qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
315 }
316
317 /* Are all TX queues of the device empty? */
318 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
319 {
320 unsigned int i;
321 for (i = 0; i < dev->num_tx_queues; i++) {
322 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
323 const struct Qdisc *q = txq->qdisc;
324
325 if (q->q.qlen)
326 return false;
327 }
328 return true;
329 }
330
331 /* Are any of the TX qdiscs changing? */
332 static inline bool qdisc_tx_changing(struct net_device *dev)
333 {
334 unsigned int i;
335 for (i = 0; i < dev->num_tx_queues; i++) {
336 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
337 if (txq->qdisc != txq->qdisc_sleeping)
338 return true;
339 }
340 return false;
341 }
342
343 /* Is the device using the noop qdisc on all queues? */
344 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
345 {
346 unsigned int i;
347 for (i = 0; i < dev->num_tx_queues; i++) {
348 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
349 if (txq->qdisc != &noop_qdisc)
350 return false;
351 }
352 return true;
353 }
354
355 static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
356 {
357 return qdisc_skb_cb(skb)->pkt_len;
358 }
359
360 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
361 enum net_xmit_qdisc_t {
362 __NET_XMIT_STOLEN = 0x00010000,
363 __NET_XMIT_BYPASS = 0x00020000,
364 };
365
366 #ifdef CONFIG_NET_CLS_ACT
367 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
368 #else
369 #define net_xmit_drop_count(e) (1)
370 #endif
371
372 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
373 {
374 #ifdef CONFIG_NET_SCHED
375 if (sch->stab)
376 qdisc_calculate_pkt_len(skb, sch->stab);
377 #endif
378 return sch->enqueue(skb, sch);
379 }
380
381 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
382 {
383 qdisc_skb_cb(skb)->pkt_len = skb->len;
384 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
385 }
386
387 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
388 struct sk_buff_head *list)
389 {
390 __skb_queue_tail(list, skb);
391 sch->qstats.backlog += qdisc_pkt_len(skb);
392 sch->bstats.bytes += qdisc_pkt_len(skb);
393 sch->bstats.packets++;
394
395 return NET_XMIT_SUCCESS;
396 }
397
398 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
399 {
400 return __qdisc_enqueue_tail(skb, sch, &sch->q);
401 }
402
403 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
404 struct sk_buff_head *list)
405 {
406 struct sk_buff *skb = __skb_dequeue(list);
407
408 if (likely(skb != NULL))
409 sch->qstats.backlog -= qdisc_pkt_len(skb);
410
411 return skb;
412 }
413
414 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
415 {
416 return __qdisc_dequeue_head(sch, &sch->q);
417 }
418
419 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
420 struct sk_buff_head *list)
421 {
422 struct sk_buff *skb = __skb_dequeue_tail(list);
423
424 if (likely(skb != NULL))
425 sch->qstats.backlog -= qdisc_pkt_len(skb);
426
427 return skb;
428 }
429
430 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
431 {
432 return __qdisc_dequeue_tail(sch, &sch->q);
433 }
434
435 static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch,
436 struct sk_buff_head *list)
437 {
438 __skb_queue_head(list, skb);
439 sch->qstats.backlog += qdisc_pkt_len(skb);
440 sch->qstats.requeues++;
441
442 return NET_XMIT_SUCCESS;
443 }
444
445 static inline int qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch)
446 {
447 return __qdisc_requeue(skb, sch, &sch->q);
448 }
449
450 static inline void __qdisc_reset_queue(struct Qdisc *sch,
451 struct sk_buff_head *list)
452 {
453 /*
454 * We do not know the backlog in bytes of this list, it
455 * is up to the caller to correct it
456 */
457 __skb_queue_purge(list);
458 }
459
460 static inline void qdisc_reset_queue(struct Qdisc *sch)
461 {
462 __qdisc_reset_queue(sch, &sch->q);
463 sch->qstats.backlog = 0;
464 }
465
466 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
467 struct sk_buff_head *list)
468 {
469 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
470
471 if (likely(skb != NULL)) {
472 unsigned int len = qdisc_pkt_len(skb);
473 kfree_skb(skb);
474 return len;
475 }
476
477 return 0;
478 }
479
480 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
481 {
482 return __qdisc_queue_drop(sch, &sch->q);
483 }
484
485 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
486 {
487 kfree_skb(skb);
488 sch->qstats.drops++;
489
490 return NET_XMIT_DROP;
491 }
492
493 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
494 {
495 sch->qstats.drops++;
496
497 #ifdef CONFIG_NET_CLS_ACT
498 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
499 goto drop;
500
501 return NET_XMIT_SUCCESS;
502
503 drop:
504 #endif
505 kfree_skb(skb);
506 return NET_XMIT_DROP;
507 }
508
509 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
510 long it will take to send a packet given its size.
511 */
512 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
513 {
514 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
515 if (slot < 0)
516 slot = 0;
517 slot >>= rtab->rate.cell_log;
518 if (slot > 255)
519 return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
520 return rtab->data[slot];
521 }
522
523 #ifdef CONFIG_NET_CLS_ACT
524 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
525 {
526 struct sk_buff *n = skb_clone(skb, gfp_mask);
527
528 if (n) {
529 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
530 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
531 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
532 }
533 return n;
534 }
535 #endif
536
537 #endif
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