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