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usb-storage: make sddr55 a separate module
[linux-2.6/mini2440.git] / include / net / sch_generic.h
blobf8c47429044aee1db7ddf54a14e405305be51b0a
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 q;
57 struct netdev_queue *dev_queue;
58 struct Qdisc *next_sched;
59 struct list_head list;
60
61 struct gnet_stats_basic bstats;
62 struct gnet_stats_queue qstats;
63 struct gnet_stats_rate_est rate_est;
64 int (*reshape_fail)(struct sk_buff *skb,
65 struct Qdisc *q);
66
67 void *u32_node;
68
69 /* This field is deprecated, but it is still used by CBQ
70 * and it will live until better solution will be invented.
71 */
72 struct Qdisc *__parent;
73 };
74
75 struct Qdisc_class_ops
76 {
77 /* Child qdisc manipulation */
78 int (*graft)(struct Qdisc *, unsigned long cl,
79 struct Qdisc *, struct Qdisc **);
80 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
81 void (*qlen_notify)(struct Qdisc *, unsigned long);
82
83 /* Class manipulation routines */
84 unsigned long (*get)(struct Qdisc *, u32 classid);
85 void (*put)(struct Qdisc *, unsigned long);
86 int (*change)(struct Qdisc *, u32, u32,
87 struct nlattr **, unsigned long *);
88 int (*delete)(struct Qdisc *, unsigned long);
89 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
90
91 /* Filter manipulation */
92 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
93 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
94 u32 classid);
95 void (*unbind_tcf)(struct Qdisc *, unsigned long);
96
97 /* rtnetlink specific */
98 int (*dump)(struct Qdisc *, unsigned long,
99 struct sk_buff *skb, struct tcmsg*);
100 int (*dump_stats)(struct Qdisc *, unsigned long,
101 struct gnet_dump *);
102 };
103
104 struct Qdisc_ops
105 {
106 struct Qdisc_ops *next;
107 const struct Qdisc_class_ops *cl_ops;
108 char id[IFNAMSIZ];
109 int priv_size;
110
111 int (*enqueue)(struct sk_buff *, struct Qdisc *);
112 struct sk_buff * (*dequeue)(struct Qdisc *);
113 struct sk_buff * (*peek)(struct Qdisc *);
114 unsigned int (*drop)(struct Qdisc *);
115
116 int (*init)(struct Qdisc *, struct nlattr *arg);
117 void (*reset)(struct Qdisc *);
118 void (*destroy)(struct Qdisc *);
119 int (*change)(struct Qdisc *, struct nlattr *arg);
120
121 int (*dump)(struct Qdisc *, struct sk_buff *);
122 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
123
124 struct module *owner;
125 };
126
127
128 struct tcf_result
129 {
130 unsigned long class;
131 u32 classid;
132 };
133
134 struct tcf_proto_ops
135 {
136 struct tcf_proto_ops *next;
137 char kind[IFNAMSIZ];
138
139 int (*classify)(struct sk_buff*, struct tcf_proto*,
140 struct tcf_result *);
141 int (*init)(struct tcf_proto*);
142 void (*destroy)(struct tcf_proto*);
143
144 unsigned long (*get)(struct tcf_proto*, u32 handle);
145 void (*put)(struct tcf_proto*, unsigned long);
146 int (*change)(struct tcf_proto*, unsigned long,
147 u32 handle, struct nlattr **,
148 unsigned long *);
149 int (*delete)(struct tcf_proto*, unsigned long);
150 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
151
152 /* rtnetlink specific */
153 int (*dump)(struct tcf_proto*, unsigned long,
154 struct sk_buff *skb, struct tcmsg*);
155
156 struct module *owner;
157 };
158
159 struct tcf_proto
160 {
161 /* Fast access part */
162 struct tcf_proto *next;
163 void *root;
164 int (*classify)(struct sk_buff*, struct tcf_proto*,
165 struct tcf_result *);
166 __be16 protocol;
167
168 /* All the rest */
169 u32 prio;
170 u32 classid;
171 struct Qdisc *q;
172 void *data;
173 struct tcf_proto_ops *ops;
174 };
175
176 struct qdisc_skb_cb {
177 unsigned int pkt_len;
178 char data[];
179 };
180
181 static inline struct qdisc_skb_cb *qdisc_skb_cb(struct sk_buff *skb)
182 {
183 return (struct qdisc_skb_cb *)skb->cb;
184 }
185
186 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
187 {
188 return &qdisc->q.lock;
189 }
190
191 static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
192 {
193 return qdisc->dev_queue->qdisc;
194 }
195
196 static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
197 {
198 return qdisc->dev_queue->qdisc_sleeping;
199 }
200
201 /* The qdisc root lock is a mechanism by which to top level
202 * of a qdisc tree can be locked from any qdisc node in the
203 * forest. This allows changing the configuration of some
204 * aspect of the qdisc tree while blocking out asynchronous
205 * qdisc access in the packet processing paths.
206 *
207 * It is only legal to do this when the root will not change
208 * on us. Otherwise we'll potentially lock the wrong qdisc
209 * root. This is enforced by holding the RTNL semaphore, which
210 * all users of this lock accessor must do.
211 */
212 static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
213 {
214 struct Qdisc *root = qdisc_root(qdisc);
215
216 ASSERT_RTNL();
217 return qdisc_lock(root);
218 }
219
220 static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
221 {
222 struct Qdisc *root = qdisc_root_sleeping(qdisc);
223
224 ASSERT_RTNL();
225 return qdisc_lock(root);
226 }
227
228 static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
229 {
230 return qdisc->dev_queue->dev;
231 }
232
233 static inline void sch_tree_lock(struct Qdisc *q)
234 {
235 spin_lock_bh(qdisc_root_sleeping_lock(q));
236 }
237
238 static inline void sch_tree_unlock(struct Qdisc *q)
239 {
240 spin_unlock_bh(qdisc_root_sleeping_lock(q));
241 }
242
243 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
244 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
245
246 extern struct Qdisc noop_qdisc;
247 extern struct Qdisc_ops noop_qdisc_ops;
248
249 struct Qdisc_class_common
250 {
251 u32 classid;
252 struct hlist_node hnode;
253 };
254
255 struct Qdisc_class_hash
256 {
257 struct hlist_head *hash;
258 unsigned int hashsize;
259 unsigned int hashmask;
260 unsigned int hashelems;
261 };
262
263 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
264 {
265 id ^= id >> 8;
266 id ^= id >> 4;
267 return id & mask;
268 }
269
270 static inline struct Qdisc_class_common *
271 qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
272 {
273 struct Qdisc_class_common *cl;
274 struct hlist_node *n;
275 unsigned int h;
276
277 h = qdisc_class_hash(id, hash->hashmask);
278 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
279 if (cl->classid == id)
280 return cl;
281 }
282 return NULL;
283 }
284
285 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
286 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
287 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
288 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
289 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
290
291 extern void dev_init_scheduler(struct net_device *dev);
292 extern void dev_shutdown(struct net_device *dev);
293 extern void dev_activate(struct net_device *dev);
294 extern void dev_deactivate(struct net_device *dev);
295 extern void qdisc_reset(struct Qdisc *qdisc);
296 extern void qdisc_destroy(struct Qdisc *qdisc);
297 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
298 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
299 struct Qdisc_ops *ops);
300 extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
301 struct netdev_queue *dev_queue,
302 struct Qdisc_ops *ops, u32 parentid);
303 extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
304 struct qdisc_size_table *stab);
305 extern void tcf_destroy(struct tcf_proto *tp);
306 extern void tcf_destroy_chain(struct tcf_proto **fl);
307
308 /* Reset all TX qdiscs of a device. */
309 static inline void qdisc_reset_all_tx(struct net_device *dev)
310 {
311 unsigned int i;
312 for (i = 0; i < dev->num_tx_queues; i++)
313 qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
314 }
315
316 /* Are all TX queues of the device empty? */
317 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
318 {
319 unsigned int i;
320 for (i = 0; i < dev->num_tx_queues; i++) {
321 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
322 const struct Qdisc *q = txq->qdisc;
323
324 if (q->q.qlen)
325 return false;
326 }
327 return true;
328 }
329
330 /* Are any of the TX qdiscs changing? */
331 static inline bool qdisc_tx_changing(struct net_device *dev)
332 {
333 unsigned int i;
334 for (i = 0; i < dev->num_tx_queues; i++) {
335 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
336 if (txq->qdisc != txq->qdisc_sleeping)
337 return true;
338 }
339 return false;
340 }
341
342 /* Is the device using the noop qdisc on all queues? */
343 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
344 {
345 unsigned int i;
346 for (i = 0; i < dev->num_tx_queues; i++) {
347 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
348 if (txq->qdisc != &noop_qdisc)
349 return false;
350 }
351 return true;
352 }
353
354 static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
355 {
356 return qdisc_skb_cb(skb)->pkt_len;
357 }
358
359 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
360 enum net_xmit_qdisc_t {
361 __NET_XMIT_STOLEN = 0x00010000,
362 __NET_XMIT_BYPASS = 0x00020000,
363 };
364
365 #ifdef CONFIG_NET_CLS_ACT
366 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
367 #else
368 #define net_xmit_drop_count(e) (1)
369 #endif
370
371 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
372 {
373 #ifdef CONFIG_NET_SCHED
374 if (sch->stab)
375 qdisc_calculate_pkt_len(skb, sch->stab);
376 #endif
377 return sch->enqueue(skb, sch);
378 }
379
380 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
381 {
382 qdisc_skb_cb(skb)->pkt_len = skb->len;
383 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
384 }
385
386 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
387 struct sk_buff_head *list)
388 {
389 __skb_queue_tail(list, skb);
390 sch->qstats.backlog += qdisc_pkt_len(skb);
391 sch->bstats.bytes += qdisc_pkt_len(skb);
392 sch->bstats.packets++;
393
394 return NET_XMIT_SUCCESS;
395 }
396
397 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
398 {
399 return __qdisc_enqueue_tail(skb, sch, &sch->q);
400 }
401
402 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
403 struct sk_buff_head *list)
404 {
405 struct sk_buff *skb = __skb_dequeue(list);
406
407 if (likely(skb != NULL))
408 sch->qstats.backlog -= qdisc_pkt_len(skb);
409
410 return skb;
411 }
412
413 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
414 {
415 return __qdisc_dequeue_head(sch, &sch->q);
416 }
417
418 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
419 struct sk_buff_head *list)
420 {
421 struct sk_buff *skb = __skb_dequeue_tail(list);
422
423 if (likely(skb != NULL))
424 sch->qstats.backlog -= qdisc_pkt_len(skb);
425
426 return skb;
427 }
428
429 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
430 {
431 return __qdisc_dequeue_tail(sch, &sch->q);
432 }
433
434 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
435 {
436 return skb_peek(&sch->q);
437 }
438
439 /* generic pseudo peek method for non-work-conserving qdisc */
440 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
441 {
442 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
443 if (!sch->gso_skb) {
444 sch->gso_skb = sch->dequeue(sch);
445 if (sch->gso_skb)
446 /* it's still part of the queue */
447 sch->q.qlen++;
448 }
449
450 return sch->gso_skb;
451 }
452
453 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
454 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
455 {
456 struct sk_buff *skb = sch->gso_skb;
457
458 if (skb) {
459 sch->gso_skb = NULL;
460 sch->q.qlen--;
461 } else {
462 skb = sch->dequeue(sch);
463 }
464
465 return skb;
466 }
467
468 static inline void __qdisc_reset_queue(struct Qdisc *sch,
469 struct sk_buff_head *list)
470 {
471 /*
472 * We do not know the backlog in bytes of this list, it
473 * is up to the caller to correct it
474 */
475 __skb_queue_purge(list);
476 }
477
478 static inline void qdisc_reset_queue(struct Qdisc *sch)
479 {
480 __qdisc_reset_queue(sch, &sch->q);
481 sch->qstats.backlog = 0;
482 }
483
484 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
485 struct sk_buff_head *list)
486 {
487 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
488
489 if (likely(skb != NULL)) {
490 unsigned int len = qdisc_pkt_len(skb);
491 kfree_skb(skb);
492 return len;
493 }
494
495 return 0;
496 }
497
498 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
499 {
500 return __qdisc_queue_drop(sch, &sch->q);
501 }
502
503 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
504 {
505 kfree_skb(skb);
506 sch->qstats.drops++;
507
508 return NET_XMIT_DROP;
509 }
510
511 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
512 {
513 sch->qstats.drops++;
514
515 #ifdef CONFIG_NET_CLS_ACT
516 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
517 goto drop;
518
519 return NET_XMIT_SUCCESS;
520
521 drop:
522 #endif
523 kfree_skb(skb);
524 return NET_XMIT_DROP;
525 }
526
527 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
528 long it will take to send a packet given its size.
529 */
530 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
531 {
532 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
533 if (slot < 0)
534 slot = 0;
535 slot >>= rtab->rate.cell_log;
536 if (slot > 255)
537 return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
538 return rtab->data[slot];
539 }
540
541 #ifdef CONFIG_NET_CLS_ACT
542 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
543 {
544 struct sk_buff *n = skb_clone(skb, gfp_mask);
545
546 if (n) {
547 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
548 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
549 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
550 }
551 return n;
552 }
553 #endif
554
555 #endif
Support for the Chinese Samsung S3C2440 based development boards