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, |
a9312ae8 | 30 | __QDISC_STATE_DEACTIVATED, |
e2627c8c DM |
31 | }; |
32 | ||
175f9c1b JK |
33 | struct qdisc_size_table { |
34 | struct list_head list; | |
35 | struct tc_sizespec szopts; | |
36 | int refcnt; | |
37 | u16 data[]; | |
38 | }; | |
39 | ||
1da177e4 LT |
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; | |
b00355db JP |
45 | #define TCQ_F_BUILTIN 1 |
46 | #define TCQ_F_THROTTLED 2 | |
47 | #define TCQ_F_INGRESS 4 | |
bbd8a0d3 | 48 | #define TCQ_F_CAN_BYPASS 8 |
23bcf634 | 49 | #define TCQ_F_MQROOT 16 |
b00355db | 50 | #define TCQ_F_WARN_NONWC (1 << 16) |
1da177e4 LT |
51 | int padded; |
52 | struct Qdisc_ops *ops; | |
175f9c1b | 53 | struct qdisc_size_table *stab; |
5e140dfc | 54 | struct list_head list; |
1da177e4 LT |
55 | u32 handle; |
56 | u32 parent; | |
57 | atomic_t refcnt; | |
1da177e4 | 58 | struct gnet_stats_rate_est rate_est; |
1da177e4 LT |
59 | int (*reshape_fail)(struct sk_buff *skb, |
60 | struct Qdisc *q); | |
61 | ||
72b25a91 DM |
62 | void *u32_node; |
63 | ||
1da177e4 LT |
64 | /* This field is deprecated, but it is still used by CBQ |
65 | * and it will live until better solution will be invented. | |
66 | */ | |
67 | struct Qdisc *__parent; | |
5e140dfc ED |
68 | struct netdev_queue *dev_queue; |
69 | struct Qdisc *next_sched; | |
70 | ||
71 | struct sk_buff *gso_skb; | |
72 | /* | |
73 | * For performance sake on SMP, we put highly modified fields at the end | |
74 | */ | |
75 | unsigned long state; | |
76 | struct sk_buff_head q; | |
c1a8f1f1 | 77 | struct gnet_stats_basic_packed bstats; |
5e140dfc | 78 | struct gnet_stats_queue qstats; |
1da177e4 LT |
79 | }; |
80 | ||
81 | struct Qdisc_class_ops | |
82 | { | |
83 | /* Child qdisc manipulation */ | |
926e61b7 | 84 | struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); |
1da177e4 LT |
85 | int (*graft)(struct Qdisc *, unsigned long cl, |
86 | struct Qdisc *, struct Qdisc **); | |
87 | struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); | |
43effa1e | 88 | void (*qlen_notify)(struct Qdisc *, unsigned long); |
1da177e4 LT |
89 | |
90 | /* Class manipulation routines */ | |
91 | unsigned long (*get)(struct Qdisc *, u32 classid); | |
92 | void (*put)(struct Qdisc *, unsigned long); | |
93 | int (*change)(struct Qdisc *, u32, u32, | |
1e90474c | 94 | struct nlattr **, unsigned long *); |
1da177e4 LT |
95 | int (*delete)(struct Qdisc *, unsigned long); |
96 | void (*walk)(struct Qdisc *, struct qdisc_walker * arg); | |
97 | ||
98 | /* Filter manipulation */ | |
99 | struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long); | |
100 | unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, | |
101 | u32 classid); | |
102 | void (*unbind_tcf)(struct Qdisc *, unsigned long); | |
103 | ||
104 | /* rtnetlink specific */ | |
105 | int (*dump)(struct Qdisc *, unsigned long, | |
106 | struct sk_buff *skb, struct tcmsg*); | |
107 | int (*dump_stats)(struct Qdisc *, unsigned long, | |
108 | struct gnet_dump *); | |
109 | }; | |
110 | ||
111 | struct Qdisc_ops | |
112 | { | |
113 | struct Qdisc_ops *next; | |
20fea08b | 114 | const struct Qdisc_class_ops *cl_ops; |
1da177e4 LT |
115 | char id[IFNAMSIZ]; |
116 | int priv_size; | |
117 | ||
118 | int (*enqueue)(struct sk_buff *, struct Qdisc *); | |
119 | struct sk_buff * (*dequeue)(struct Qdisc *); | |
90d841fd | 120 | struct sk_buff * (*peek)(struct Qdisc *); |
1da177e4 LT |
121 | unsigned int (*drop)(struct Qdisc *); |
122 | ||
1e90474c | 123 | int (*init)(struct Qdisc *, struct nlattr *arg); |
1da177e4 LT |
124 | void (*reset)(struct Qdisc *); |
125 | void (*destroy)(struct Qdisc *); | |
1e90474c | 126 | int (*change)(struct Qdisc *, struct nlattr *arg); |
6ec1c69a | 127 | void (*attach)(struct Qdisc *); |
1da177e4 LT |
128 | |
129 | int (*dump)(struct Qdisc *, struct sk_buff *); | |
130 | int (*dump_stats)(struct Qdisc *, struct gnet_dump *); | |
131 | ||
132 | struct module *owner; | |
133 | }; | |
134 | ||
135 | ||
136 | struct tcf_result | |
137 | { | |
138 | unsigned long class; | |
139 | u32 classid; | |
140 | }; | |
141 | ||
142 | struct tcf_proto_ops | |
143 | { | |
144 | struct tcf_proto_ops *next; | |
145 | char kind[IFNAMSIZ]; | |
146 | ||
147 | int (*classify)(struct sk_buff*, struct tcf_proto*, | |
148 | struct tcf_result *); | |
149 | int (*init)(struct tcf_proto*); | |
150 | void (*destroy)(struct tcf_proto*); | |
151 | ||
152 | unsigned long (*get)(struct tcf_proto*, u32 handle); | |
153 | void (*put)(struct tcf_proto*, unsigned long); | |
154 | int (*change)(struct tcf_proto*, unsigned long, | |
add93b61 | 155 | u32 handle, struct nlattr **, |
1da177e4 LT |
156 | unsigned long *); |
157 | int (*delete)(struct tcf_proto*, unsigned long); | |
158 | void (*walk)(struct tcf_proto*, struct tcf_walker *arg); | |
159 | ||
160 | /* rtnetlink specific */ | |
161 | int (*dump)(struct tcf_proto*, unsigned long, | |
162 | struct sk_buff *skb, struct tcmsg*); | |
163 | ||
164 | struct module *owner; | |
165 | }; | |
166 | ||
167 | struct tcf_proto | |
168 | { | |
169 | /* Fast access part */ | |
170 | struct tcf_proto *next; | |
171 | void *root; | |
172 | int (*classify)(struct sk_buff*, struct tcf_proto*, | |
173 | struct tcf_result *); | |
66c6f529 | 174 | __be16 protocol; |
1da177e4 LT |
175 | |
176 | /* All the rest */ | |
177 | u32 prio; | |
178 | u32 classid; | |
179 | struct Qdisc *q; | |
180 | void *data; | |
181 | struct tcf_proto_ops *ops; | |
182 | }; | |
183 | ||
175f9c1b JK |
184 | struct qdisc_skb_cb { |
185 | unsigned int pkt_len; | |
186 | char data[]; | |
187 | }; | |
188 | ||
bbd8a0d3 KK |
189 | static inline int qdisc_qlen(struct Qdisc *q) |
190 | { | |
191 | return q->q.qlen; | |
192 | } | |
193 | ||
175f9c1b JK |
194 | static inline struct qdisc_skb_cb *qdisc_skb_cb(struct sk_buff *skb) |
195 | { | |
196 | return (struct qdisc_skb_cb *)skb->cb; | |
197 | } | |
198 | ||
83874000 DM |
199 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
200 | { | |
201 | return &qdisc->q.lock; | |
202 | } | |
203 | ||
7698b4fc DM |
204 | static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc) |
205 | { | |
206 | return qdisc->dev_queue->qdisc; | |
207 | } | |
208 | ||
2540e051 JP |
209 | static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc) |
210 | { | |
211 | return qdisc->dev_queue->qdisc_sleeping; | |
212 | } | |
213 | ||
7e43f112 DM |
214 | /* The qdisc root lock is a mechanism by which to top level |
215 | * of a qdisc tree can be locked from any qdisc node in the | |
216 | * forest. This allows changing the configuration of some | |
217 | * aspect of the qdisc tree while blocking out asynchronous | |
218 | * qdisc access in the packet processing paths. | |
219 | * | |
220 | * It is only legal to do this when the root will not change | |
221 | * on us. Otherwise we'll potentially lock the wrong qdisc | |
222 | * root. This is enforced by holding the RTNL semaphore, which | |
223 | * all users of this lock accessor must do. | |
224 | */ | |
7698b4fc DM |
225 | static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc) |
226 | { | |
227 | struct Qdisc *root = qdisc_root(qdisc); | |
228 | ||
7e43f112 | 229 | ASSERT_RTNL(); |
83874000 | 230 | return qdisc_lock(root); |
7698b4fc DM |
231 | } |
232 | ||
f6f9b93f JP |
233 | static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc) |
234 | { | |
235 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
236 | ||
237 | ASSERT_RTNL(); | |
238 | return qdisc_lock(root); | |
239 | } | |
240 | ||
5ce2d488 DM |
241 | static inline struct net_device *qdisc_dev(struct Qdisc *qdisc) |
242 | { | |
243 | return qdisc->dev_queue->dev; | |
244 | } | |
1da177e4 | 245 | |
78a5b30b DM |
246 | static inline void sch_tree_lock(struct Qdisc *q) |
247 | { | |
fe439dd0 | 248 | spin_lock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
249 | } |
250 | ||
251 | static inline void sch_tree_unlock(struct Qdisc *q) | |
252 | { | |
fe439dd0 | 253 | spin_unlock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
254 | } |
255 | ||
256 | #define tcf_tree_lock(tp) sch_tree_lock((tp)->q) | |
257 | #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q) | |
1da177e4 | 258 | |
e41a33e6 TG |
259 | extern struct Qdisc noop_qdisc; |
260 | extern struct Qdisc_ops noop_qdisc_ops; | |
6ec1c69a DM |
261 | extern struct Qdisc_ops pfifo_fast_ops; |
262 | extern struct Qdisc_ops mq_qdisc_ops; | |
e41a33e6 | 263 | |
6fe1c7a5 PM |
264 | struct Qdisc_class_common |
265 | { | |
266 | u32 classid; | |
267 | struct hlist_node hnode; | |
268 | }; | |
269 | ||
270 | struct Qdisc_class_hash | |
271 | { | |
272 | struct hlist_head *hash; | |
273 | unsigned int hashsize; | |
274 | unsigned int hashmask; | |
275 | unsigned int hashelems; | |
276 | }; | |
277 | ||
278 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
279 | { | |
280 | id ^= id >> 8; | |
281 | id ^= id >> 4; | |
282 | return id & mask; | |
283 | } | |
284 | ||
285 | static inline struct Qdisc_class_common * | |
286 | qdisc_class_find(struct Qdisc_class_hash *hash, u32 id) | |
287 | { | |
288 | struct Qdisc_class_common *cl; | |
289 | struct hlist_node *n; | |
290 | unsigned int h; | |
291 | ||
292 | h = qdisc_class_hash(id, hash->hashmask); | |
293 | hlist_for_each_entry(cl, n, &hash->hash[h], hnode) { | |
294 | if (cl->classid == id) | |
295 | return cl; | |
296 | } | |
297 | return NULL; | |
298 | } | |
299 | ||
300 | extern int qdisc_class_hash_init(struct Qdisc_class_hash *); | |
301 | extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *); | |
302 | extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *); | |
303 | extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
304 | extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
305 | ||
e41a33e6 TG |
306 | extern void dev_init_scheduler(struct net_device *dev); |
307 | extern void dev_shutdown(struct net_device *dev); | |
308 | extern void dev_activate(struct net_device *dev); | |
309 | extern void dev_deactivate(struct net_device *dev); | |
589983cd PM |
310 | extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, |
311 | struct Qdisc *qdisc); | |
e41a33e6 TG |
312 | extern void qdisc_reset(struct Qdisc *qdisc); |
313 | extern void qdisc_destroy(struct Qdisc *qdisc); | |
43effa1e | 314 | extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n); |
5ce2d488 | 315 | extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
bb949fbd | 316 | struct Qdisc_ops *ops); |
e41a33e6 | 317 | extern struct Qdisc *qdisc_create_dflt(struct net_device *dev, |
bb949fbd | 318 | struct netdev_queue *dev_queue, |
9f9afec4 | 319 | struct Qdisc_ops *ops, u32 parentid); |
175f9c1b JK |
320 | extern void qdisc_calculate_pkt_len(struct sk_buff *skb, |
321 | struct qdisc_size_table *stab); | |
a48b5a61 | 322 | extern void tcf_destroy(struct tcf_proto *tp); |
ff31ab56 | 323 | extern void tcf_destroy_chain(struct tcf_proto **fl); |
1da177e4 | 324 | |
5aa70995 DM |
325 | /* Reset all TX qdiscs of a device. */ |
326 | static inline void qdisc_reset_all_tx(struct net_device *dev) | |
327 | { | |
e8a0464c DM |
328 | unsigned int i; |
329 | for (i = 0; i < dev->num_tx_queues; i++) | |
330 | qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc); | |
5aa70995 DM |
331 | } |
332 | ||
3e745dd6 DM |
333 | /* Are all TX queues of the device empty? */ |
334 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
335 | { | |
e8a0464c DM |
336 | unsigned int i; |
337 | for (i = 0; i < dev->num_tx_queues; i++) { | |
338 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
339 | const struct Qdisc *q = txq->qdisc; | |
3e745dd6 | 340 | |
e8a0464c DM |
341 | if (q->q.qlen) |
342 | return false; | |
343 | } | |
344 | return true; | |
3e745dd6 DM |
345 | } |
346 | ||
6fa9864b DM |
347 | /* Are any of the TX qdiscs changing? */ |
348 | static inline bool qdisc_tx_changing(struct net_device *dev) | |
349 | { | |
e8a0464c DM |
350 | unsigned int i; |
351 | for (i = 0; i < dev->num_tx_queues; i++) { | |
352 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
353 | if (txq->qdisc != txq->qdisc_sleeping) | |
354 | return true; | |
355 | } | |
356 | return false; | |
6fa9864b DM |
357 | } |
358 | ||
e8a0464c | 359 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
360 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
361 | { | |
e8a0464c DM |
362 | unsigned int i; |
363 | for (i = 0; i < dev->num_tx_queues; i++) { | |
364 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
365 | if (txq->qdisc != &noop_qdisc) | |
366 | return false; | |
367 | } | |
368 | return true; | |
05297949 DM |
369 | } |
370 | ||
0abf77e5 JK |
371 | static inline unsigned int qdisc_pkt_len(struct sk_buff *skb) |
372 | { | |
175f9c1b | 373 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
374 | } |
375 | ||
c27f339a | 376 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
377 | enum net_xmit_qdisc_t { |
378 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 379 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
380 | }; |
381 | ||
c27f339a | 382 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 383 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
384 | #else |
385 | #define net_xmit_drop_count(e) (1) | |
386 | #endif | |
387 | ||
5f86173b JK |
388 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
389 | { | |
3a682fbd | 390 | #ifdef CONFIG_NET_SCHED |
175f9c1b JK |
391 | if (sch->stab) |
392 | qdisc_calculate_pkt_len(skb, sch->stab); | |
3a682fbd | 393 | #endif |
5f86173b JK |
394 | return sch->enqueue(skb, sch); |
395 | } | |
396 | ||
397 | static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch) | |
398 | { | |
175f9c1b | 399 | qdisc_skb_cb(skb)->pkt_len = skb->len; |
378a2f09 | 400 | return qdisc_enqueue(skb, sch) & NET_XMIT_MASK; |
5f86173b JK |
401 | } |
402 | ||
bbd8a0d3 KK |
403 | static inline void __qdisc_update_bstats(struct Qdisc *sch, unsigned int len) |
404 | { | |
405 | sch->bstats.bytes += len; | |
406 | sch->bstats.packets++; | |
407 | } | |
408 | ||
9972b25d TG |
409 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
410 | struct sk_buff_head *list) | |
411 | { | |
412 | __skb_queue_tail(list, skb); | |
0abf77e5 | 413 | sch->qstats.backlog += qdisc_pkt_len(skb); |
bbd8a0d3 | 414 | __qdisc_update_bstats(sch, qdisc_pkt_len(skb)); |
9972b25d TG |
415 | |
416 | return NET_XMIT_SUCCESS; | |
417 | } | |
418 | ||
419 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
420 | { | |
421 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
422 | } | |
423 | ||
424 | static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch, | |
425 | struct sk_buff_head *list) | |
426 | { | |
427 | struct sk_buff *skb = __skb_dequeue(list); | |
428 | ||
429 | if (likely(skb != NULL)) | |
0abf77e5 | 430 | sch->qstats.backlog -= qdisc_pkt_len(skb); |
9972b25d TG |
431 | |
432 | return skb; | |
433 | } | |
434 | ||
435 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
436 | { | |
437 | return __qdisc_dequeue_head(sch, &sch->q); | |
438 | } | |
439 | ||
440 | static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch, | |
441 | struct sk_buff_head *list) | |
442 | { | |
443 | struct sk_buff *skb = __skb_dequeue_tail(list); | |
444 | ||
445 | if (likely(skb != NULL)) | |
0abf77e5 | 446 | sch->qstats.backlog -= qdisc_pkt_len(skb); |
9972b25d TG |
447 | |
448 | return skb; | |
449 | } | |
450 | ||
451 | static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch) | |
452 | { | |
453 | return __qdisc_dequeue_tail(sch, &sch->q); | |
454 | } | |
455 | ||
48a8f519 PM |
456 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
457 | { | |
458 | return skb_peek(&sch->q); | |
459 | } | |
460 | ||
77be155c JP |
461 | /* generic pseudo peek method for non-work-conserving qdisc */ |
462 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
463 | { | |
464 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ | |
61c9eaf9 | 465 | if (!sch->gso_skb) { |
77be155c | 466 | sch->gso_skb = sch->dequeue(sch); |
61c9eaf9 JP |
467 | if (sch->gso_skb) |
468 | /* it's still part of the queue */ | |
469 | sch->q.qlen++; | |
470 | } | |
77be155c JP |
471 | |
472 | return sch->gso_skb; | |
473 | } | |
474 | ||
475 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
476 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
477 | { | |
478 | struct sk_buff *skb = sch->gso_skb; | |
479 | ||
61c9eaf9 | 480 | if (skb) { |
77be155c | 481 | sch->gso_skb = NULL; |
61c9eaf9 JP |
482 | sch->q.qlen--; |
483 | } else { | |
77be155c | 484 | skb = sch->dequeue(sch); |
61c9eaf9 | 485 | } |
77be155c JP |
486 | |
487 | return skb; | |
488 | } | |
489 | ||
9972b25d TG |
490 | static inline void __qdisc_reset_queue(struct Qdisc *sch, |
491 | struct sk_buff_head *list) | |
492 | { | |
493 | /* | |
494 | * We do not know the backlog in bytes of this list, it | |
495 | * is up to the caller to correct it | |
496 | */ | |
93245dd6 | 497 | __skb_queue_purge(list); |
9972b25d TG |
498 | } |
499 | ||
500 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
501 | { | |
502 | __qdisc_reset_queue(sch, &sch->q); | |
503 | sch->qstats.backlog = 0; | |
504 | } | |
505 | ||
506 | static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch, | |
507 | struct sk_buff_head *list) | |
508 | { | |
509 | struct sk_buff *skb = __qdisc_dequeue_tail(sch, list); | |
510 | ||
511 | if (likely(skb != NULL)) { | |
0abf77e5 | 512 | unsigned int len = qdisc_pkt_len(skb); |
9972b25d TG |
513 | kfree_skb(skb); |
514 | return len; | |
515 | } | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | static inline unsigned int qdisc_queue_drop(struct Qdisc *sch) | |
521 | { | |
522 | return __qdisc_queue_drop(sch, &sch->q); | |
523 | } | |
524 | ||
525 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) | |
526 | { | |
527 | kfree_skb(skb); | |
528 | sch->qstats.drops++; | |
529 | ||
530 | return NET_XMIT_DROP; | |
531 | } | |
532 | ||
533 | static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch) | |
534 | { | |
535 | sch->qstats.drops++; | |
536 | ||
c3bc7cff | 537 | #ifdef CONFIG_NET_CLS_ACT |
9972b25d TG |
538 | if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch)) |
539 | goto drop; | |
540 | ||
541 | return NET_XMIT_SUCCESS; | |
542 | ||
543 | drop: | |
544 | #endif | |
545 | kfree_skb(skb); | |
546 | return NET_XMIT_DROP; | |
547 | } | |
548 | ||
e9bef55d JDB |
549 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
550 | long it will take to send a packet given its size. | |
551 | */ | |
552 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
553 | { | |
e08b0998 JDB |
554 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
555 | if (slot < 0) | |
556 | slot = 0; | |
e9bef55d JDB |
557 | slot >>= rtab->rate.cell_log; |
558 | if (slot > 255) | |
559 | return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]); | |
560 | return rtab->data[slot]; | |
561 | } | |
562 | ||
12da81d1 JHS |
563 | #ifdef CONFIG_NET_CLS_ACT |
564 | static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask) | |
565 | { | |
566 | struct sk_buff *n = skb_clone(skb, gfp_mask); | |
567 | ||
568 | if (n) { | |
569 | n->tc_verd = SET_TC_VERD(n->tc_verd, 0); | |
570 | n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd); | |
571 | n->tc_verd = CLR_TC_MUNGED(n->tc_verd); | |
12da81d1 JHS |
572 | } |
573 | return n; | |
574 | } | |
575 | #endif | |
576 | ||
1da177e4 | 577 | #endif |