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