Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef __NET_SCHED_GENERIC_H |
2 | #define __NET_SCHED_GENERIC_H | |
3 | ||
1da177e4 LT |
4 | #include <linux/netdevice.h> |
5 | #include <linux/types.h> | |
6 | #include <linux/rcupdate.h> | |
7 | #include <linux/module.h> | |
1da177e4 LT |
8 | #include <linux/pkt_sched.h> |
9 | #include <linux/pkt_cls.h> | |
10 | #include <net/gen_stats.h> | |
be577ddc | 11 | #include <net/rtnetlink.h> |
1da177e4 LT |
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 | ||
e2627c8c DM |
26 | enum qdisc_state_t |
27 | { | |
28 | __QDISC_STATE_RUNNING, | |
37437bb2 | 29 | __QDISC_STATE_SCHED, |
e2627c8c DM |
30 | }; |
31 | ||
1da177e4 LT |
32 | struct Qdisc |
33 | { | |
34 | int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev); | |
35 | struct sk_buff * (*dequeue)(struct Qdisc *dev); | |
36 | unsigned flags; | |
37 | #define TCQ_F_BUILTIN 1 | |
38 | #define TCQ_F_THROTTLED 2 | |
39 | #define TCQ_F_INGRESS 4 | |
40 | int padded; | |
41 | struct Qdisc_ops *ops; | |
42 | u32 handle; | |
43 | u32 parent; | |
44 | atomic_t refcnt; | |
e2627c8c | 45 | unsigned long state; |
d3b753db | 46 | struct sk_buff *gso_skb; |
1da177e4 | 47 | struct sk_buff_head q; |
bb949fbd | 48 | struct netdev_queue *dev_queue; |
37437bb2 | 49 | struct Qdisc *next_sched; |
1da177e4 LT |
50 | struct list_head list; |
51 | ||
52 | struct gnet_stats_basic bstats; | |
53 | struct gnet_stats_queue qstats; | |
54 | struct gnet_stats_rate_est rate_est; | |
1da177e4 LT |
55 | struct rcu_head q_rcu; |
56 | int (*reshape_fail)(struct sk_buff *skb, | |
57 | struct Qdisc *q); | |
58 | ||
72b25a91 DM |
59 | void *u32_node; |
60 | ||
1da177e4 LT |
61 | /* This field is deprecated, but it is still used by CBQ |
62 | * and it will live until better solution will be invented. | |
63 | */ | |
64 | struct Qdisc *__parent; | |
65 | }; | |
66 | ||
67 | struct Qdisc_class_ops | |
68 | { | |
69 | /* Child qdisc manipulation */ | |
70 | int (*graft)(struct Qdisc *, unsigned long cl, | |
71 | struct Qdisc *, struct Qdisc **); | |
72 | struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); | |
43effa1e | 73 | void (*qlen_notify)(struct Qdisc *, unsigned long); |
1da177e4 LT |
74 | |
75 | /* Class manipulation routines */ | |
76 | unsigned long (*get)(struct Qdisc *, u32 classid); | |
77 | void (*put)(struct Qdisc *, unsigned long); | |
78 | int (*change)(struct Qdisc *, u32, u32, | |
1e90474c | 79 | struct nlattr **, unsigned long *); |
1da177e4 LT |
80 | int (*delete)(struct Qdisc *, unsigned long); |
81 | void (*walk)(struct Qdisc *, struct qdisc_walker * arg); | |
82 | ||
83 | /* Filter manipulation */ | |
84 | struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long); | |
85 | unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, | |
86 | u32 classid); | |
87 | void (*unbind_tcf)(struct Qdisc *, unsigned long); | |
88 | ||
89 | /* rtnetlink specific */ | |
90 | int (*dump)(struct Qdisc *, unsigned long, | |
91 | struct sk_buff *skb, struct tcmsg*); | |
92 | int (*dump_stats)(struct Qdisc *, unsigned long, | |
93 | struct gnet_dump *); | |
94 | }; | |
95 | ||
96 | struct Qdisc_ops | |
97 | { | |
98 | struct Qdisc_ops *next; | |
20fea08b | 99 | const struct Qdisc_class_ops *cl_ops; |
1da177e4 LT |
100 | char id[IFNAMSIZ]; |
101 | int priv_size; | |
102 | ||
103 | int (*enqueue)(struct sk_buff *, struct Qdisc *); | |
104 | struct sk_buff * (*dequeue)(struct Qdisc *); | |
105 | int (*requeue)(struct sk_buff *, struct Qdisc *); | |
106 | unsigned int (*drop)(struct Qdisc *); | |
107 | ||
1e90474c | 108 | int (*init)(struct Qdisc *, struct nlattr *arg); |
1da177e4 LT |
109 | void (*reset)(struct Qdisc *); |
110 | void (*destroy)(struct Qdisc *); | |
1e90474c | 111 | int (*change)(struct Qdisc *, struct nlattr *arg); |
1da177e4 LT |
112 | |
113 | int (*dump)(struct Qdisc *, struct sk_buff *); | |
114 | int (*dump_stats)(struct Qdisc *, struct gnet_dump *); | |
115 | ||
116 | struct module *owner; | |
117 | }; | |
118 | ||
119 | ||
120 | struct tcf_result | |
121 | { | |
122 | unsigned long class; | |
123 | u32 classid; | |
124 | }; | |
125 | ||
126 | struct tcf_proto_ops | |
127 | { | |
128 | struct tcf_proto_ops *next; | |
129 | char kind[IFNAMSIZ]; | |
130 | ||
131 | int (*classify)(struct sk_buff*, struct tcf_proto*, | |
132 | struct tcf_result *); | |
133 | int (*init)(struct tcf_proto*); | |
134 | void (*destroy)(struct tcf_proto*); | |
135 | ||
136 | unsigned long (*get)(struct tcf_proto*, u32 handle); | |
137 | void (*put)(struct tcf_proto*, unsigned long); | |
138 | int (*change)(struct tcf_proto*, unsigned long, | |
add93b61 | 139 | u32 handle, struct nlattr **, |
1da177e4 LT |
140 | unsigned long *); |
141 | int (*delete)(struct tcf_proto*, unsigned long); | |
142 | void (*walk)(struct tcf_proto*, struct tcf_walker *arg); | |
143 | ||
144 | /* rtnetlink specific */ | |
145 | int (*dump)(struct tcf_proto*, unsigned long, | |
146 | struct sk_buff *skb, struct tcmsg*); | |
147 | ||
148 | struct module *owner; | |
149 | }; | |
150 | ||
151 | struct tcf_proto | |
152 | { | |
153 | /* Fast access part */ | |
154 | struct tcf_proto *next; | |
155 | void *root; | |
156 | int (*classify)(struct sk_buff*, struct tcf_proto*, | |
157 | struct tcf_result *); | |
66c6f529 | 158 | __be16 protocol; |
1da177e4 LT |
159 | |
160 | /* All the rest */ | |
161 | u32 prio; | |
162 | u32 classid; | |
163 | struct Qdisc *q; | |
164 | void *data; | |
165 | struct tcf_proto_ops *ops; | |
166 | }; | |
167 | ||
83874000 DM |
168 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
169 | { | |
170 | return &qdisc->q.lock; | |
171 | } | |
172 | ||
7698b4fc DM |
173 | static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc) |
174 | { | |
175 | return qdisc->dev_queue->qdisc; | |
176 | } | |
177 | ||
178 | static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc) | |
179 | { | |
180 | struct Qdisc *root = qdisc_root(qdisc); | |
181 | ||
83874000 | 182 | return qdisc_lock(root); |
7698b4fc DM |
183 | } |
184 | ||
5ce2d488 DM |
185 | static inline struct net_device *qdisc_dev(struct Qdisc *qdisc) |
186 | { | |
187 | return qdisc->dev_queue->dev; | |
188 | } | |
1da177e4 | 189 | |
78a5b30b DM |
190 | static inline void sch_tree_lock(struct Qdisc *q) |
191 | { | |
192 | spin_lock_bh(qdisc_root_lock(q)); | |
193 | } | |
194 | ||
195 | static inline void sch_tree_unlock(struct Qdisc *q) | |
196 | { | |
197 | spin_unlock_bh(qdisc_root_lock(q)); | |
198 | } | |
199 | ||
200 | #define tcf_tree_lock(tp) sch_tree_lock((tp)->q) | |
201 | #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q) | |
1da177e4 | 202 | |
e41a33e6 TG |
203 | extern struct Qdisc noop_qdisc; |
204 | extern struct Qdisc_ops noop_qdisc_ops; | |
205 | ||
6fe1c7a5 PM |
206 | struct Qdisc_class_common |
207 | { | |
208 | u32 classid; | |
209 | struct hlist_node hnode; | |
210 | }; | |
211 | ||
212 | struct Qdisc_class_hash | |
213 | { | |
214 | struct hlist_head *hash; | |
215 | unsigned int hashsize; | |
216 | unsigned int hashmask; | |
217 | unsigned int hashelems; | |
218 | }; | |
219 | ||
220 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
221 | { | |
222 | id ^= id >> 8; | |
223 | id ^= id >> 4; | |
224 | return id & mask; | |
225 | } | |
226 | ||
227 | static inline struct Qdisc_class_common * | |
228 | qdisc_class_find(struct Qdisc_class_hash *hash, u32 id) | |
229 | { | |
230 | struct Qdisc_class_common *cl; | |
231 | struct hlist_node *n; | |
232 | unsigned int h; | |
233 | ||
234 | h = qdisc_class_hash(id, hash->hashmask); | |
235 | hlist_for_each_entry(cl, n, &hash->hash[h], hnode) { | |
236 | if (cl->classid == id) | |
237 | return cl; | |
238 | } | |
239 | return NULL; | |
240 | } | |
241 | ||
242 | extern int qdisc_class_hash_init(struct Qdisc_class_hash *); | |
243 | extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *); | |
244 | extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *); | |
245 | extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
246 | extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
247 | ||
e41a33e6 TG |
248 | extern void dev_init_scheduler(struct net_device *dev); |
249 | extern void dev_shutdown(struct net_device *dev); | |
250 | extern void dev_activate(struct net_device *dev); | |
251 | extern void dev_deactivate(struct net_device *dev); | |
252 | extern void qdisc_reset(struct Qdisc *qdisc); | |
253 | extern void qdisc_destroy(struct Qdisc *qdisc); | |
43effa1e | 254 | extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n); |
5ce2d488 | 255 | extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
bb949fbd | 256 | struct Qdisc_ops *ops); |
e41a33e6 | 257 | extern struct Qdisc *qdisc_create_dflt(struct net_device *dev, |
bb949fbd | 258 | struct netdev_queue *dev_queue, |
9f9afec4 | 259 | struct Qdisc_ops *ops, u32 parentid); |
a48b5a61 | 260 | extern void tcf_destroy(struct tcf_proto *tp); |
ff31ab56 | 261 | extern void tcf_destroy_chain(struct tcf_proto **fl); |
1da177e4 | 262 | |
5aa70995 DM |
263 | /* Reset all TX qdiscs of a device. */ |
264 | static inline void qdisc_reset_all_tx(struct net_device *dev) | |
265 | { | |
e8a0464c DM |
266 | unsigned int i; |
267 | for (i = 0; i < dev->num_tx_queues; i++) | |
268 | qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc); | |
5aa70995 DM |
269 | } |
270 | ||
3e745dd6 DM |
271 | /* Are all TX queues of the device empty? */ |
272 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
273 | { | |
e8a0464c DM |
274 | unsigned int i; |
275 | for (i = 0; i < dev->num_tx_queues; i++) { | |
276 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
277 | const struct Qdisc *q = txq->qdisc; | |
3e745dd6 | 278 | |
e8a0464c DM |
279 | if (q->q.qlen) |
280 | return false; | |
281 | } | |
282 | return true; | |
3e745dd6 DM |
283 | } |
284 | ||
6fa9864b DM |
285 | /* Are any of the TX qdiscs changing? */ |
286 | static inline bool qdisc_tx_changing(struct net_device *dev) | |
287 | { | |
e8a0464c DM |
288 | unsigned int i; |
289 | for (i = 0; i < dev->num_tx_queues; i++) { | |
290 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
291 | if (txq->qdisc != txq->qdisc_sleeping) | |
292 | return true; | |
293 | } | |
294 | return false; | |
6fa9864b DM |
295 | } |
296 | ||
e8a0464c | 297 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
298 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
299 | { | |
e8a0464c DM |
300 | unsigned int i; |
301 | for (i = 0; i < dev->num_tx_queues; i++) { | |
302 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
303 | if (txq->qdisc != &noop_qdisc) | |
304 | return false; | |
305 | } | |
306 | return true; | |
05297949 DM |
307 | } |
308 | ||
5f86173b JK |
309 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
310 | { | |
311 | return sch->enqueue(skb, sch); | |
312 | } | |
313 | ||
314 | static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch) | |
315 | { | |
316 | return qdisc_enqueue(skb, sch); | |
317 | } | |
318 | ||
9972b25d TG |
319 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
320 | struct sk_buff_head *list) | |
321 | { | |
322 | __skb_queue_tail(list, skb); | |
323 | sch->qstats.backlog += skb->len; | |
324 | sch->bstats.bytes += skb->len; | |
325 | sch->bstats.packets++; | |
326 | ||
327 | return NET_XMIT_SUCCESS; | |
328 | } | |
329 | ||
330 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
331 | { | |
332 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
333 | } | |
334 | ||
335 | static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch, | |
336 | struct sk_buff_head *list) | |
337 | { | |
338 | struct sk_buff *skb = __skb_dequeue(list); | |
339 | ||
340 | if (likely(skb != NULL)) | |
341 | sch->qstats.backlog -= skb->len; | |
342 | ||
343 | return skb; | |
344 | } | |
345 | ||
346 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
347 | { | |
348 | return __qdisc_dequeue_head(sch, &sch->q); | |
349 | } | |
350 | ||
351 | static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch, | |
352 | struct sk_buff_head *list) | |
353 | { | |
354 | struct sk_buff *skb = __skb_dequeue_tail(list); | |
355 | ||
356 | if (likely(skb != NULL)) | |
357 | sch->qstats.backlog -= skb->len; | |
358 | ||
359 | return skb; | |
360 | } | |
361 | ||
362 | static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch) | |
363 | { | |
364 | return __qdisc_dequeue_tail(sch, &sch->q); | |
365 | } | |
366 | ||
367 | static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch, | |
368 | struct sk_buff_head *list) | |
369 | { | |
370 | __skb_queue_head(list, skb); | |
371 | sch->qstats.backlog += skb->len; | |
372 | sch->qstats.requeues++; | |
373 | ||
374 | return NET_XMIT_SUCCESS; | |
375 | } | |
376 | ||
377 | static inline int qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch) | |
378 | { | |
379 | return __qdisc_requeue(skb, sch, &sch->q); | |
380 | } | |
381 | ||
382 | static inline void __qdisc_reset_queue(struct Qdisc *sch, | |
383 | struct sk_buff_head *list) | |
384 | { | |
385 | /* | |
386 | * We do not know the backlog in bytes of this list, it | |
387 | * is up to the caller to correct it | |
388 | */ | |
93245dd6 | 389 | __skb_queue_purge(list); |
9972b25d TG |
390 | } |
391 | ||
392 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
393 | { | |
394 | __qdisc_reset_queue(sch, &sch->q); | |
395 | sch->qstats.backlog = 0; | |
396 | } | |
397 | ||
398 | static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch, | |
399 | struct sk_buff_head *list) | |
400 | { | |
401 | struct sk_buff *skb = __qdisc_dequeue_tail(sch, list); | |
402 | ||
403 | if (likely(skb != NULL)) { | |
404 | unsigned int len = skb->len; | |
405 | kfree_skb(skb); | |
406 | return len; | |
407 | } | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | static inline unsigned int qdisc_queue_drop(struct Qdisc *sch) | |
413 | { | |
414 | return __qdisc_queue_drop(sch, &sch->q); | |
415 | } | |
416 | ||
417 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) | |
418 | { | |
419 | kfree_skb(skb); | |
420 | sch->qstats.drops++; | |
421 | ||
422 | return NET_XMIT_DROP; | |
423 | } | |
424 | ||
425 | static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch) | |
426 | { | |
427 | sch->qstats.drops++; | |
428 | ||
c3bc7cff | 429 | #ifdef CONFIG_NET_CLS_ACT |
9972b25d TG |
430 | if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch)) |
431 | goto drop; | |
432 | ||
433 | return NET_XMIT_SUCCESS; | |
434 | ||
435 | drop: | |
436 | #endif | |
437 | kfree_skb(skb); | |
438 | return NET_XMIT_DROP; | |
439 | } | |
440 | ||
e9bef55d JDB |
441 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
442 | long it will take to send a packet given its size. | |
443 | */ | |
444 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
445 | { | |
e08b0998 JDB |
446 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
447 | if (slot < 0) | |
448 | slot = 0; | |
e9bef55d JDB |
449 | slot >>= rtab->rate.cell_log; |
450 | if (slot > 255) | |
451 | return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]); | |
452 | return rtab->data[slot]; | |
453 | } | |
454 | ||
12da81d1 JHS |
455 | #ifdef CONFIG_NET_CLS_ACT |
456 | static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask) | |
457 | { | |
458 | struct sk_buff *n = skb_clone(skb, gfp_mask); | |
459 | ||
460 | if (n) { | |
461 | n->tc_verd = SET_TC_VERD(n->tc_verd, 0); | |
462 | n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd); | |
463 | n->tc_verd = CLR_TC_MUNGED(n->tc_verd); | |
12da81d1 JHS |
464 | } |
465 | return n; | |
466 | } | |
467 | #endif | |
468 | ||
1da177e4 | 469 | #endif |