blob: f8c47429044aee1db7ddf54a14e405305be51b0a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __NET_SCHED_GENERIC_H
2#define __NET_SCHED_GENERIC_H
3
Linus Torvalds1da177e2005-04-16 15:20:36 -07004#include <linux/netdevice.h>
5#include <linux/types.h>
6#include <linux/rcupdate.h>
7#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/pkt_sched.h>
9#include <linux/pkt_cls.h>
10#include <net/gen_stats.h>
Thomas Grafbe577dd2007-03-22 11:55:50 -070011#include <net/rtnetlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012
13struct Qdisc_ops;
14struct qdisc_walker;
15struct tcf_walker;
16struct module;
17
18struct qdisc_rate_table
19{
20 struct tc_ratespec rate;
21 u32 data[256];
22 struct qdisc_rate_table *next;
23 int refcnt;
24};
25
David S. Millere2627c82008-07-16 00:56:32 -070026enum qdisc_state_t
27{
28 __QDISC_STATE_RUNNING,
David S. Miller37437bb2008-07-16 02:15:04 -070029 __QDISC_STATE_SCHED,
David S. Millera9312ae2008-08-17 21:51:03 -070030 __QDISC_STATE_DEACTIVATED,
David S. Millere2627c82008-07-16 00:56:32 -070031};
32
Jussi Kivilinna175f9c12008-07-20 00:08:47 -070033struct qdisc_size_table {
34 struct list_head list;
35 struct tc_sizespec szopts;
36 int refcnt;
37 u16 data[];
38};
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040struct 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;
Jussi Kivilinna175f9c12008-07-20 00:08:47 -070050 struct qdisc_size_table *stab;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 u32 handle;
52 u32 parent;
53 atomic_t refcnt;
David S. Millere2627c82008-07-16 00:56:32 -070054 unsigned long state;
Jarek Poplawski554794d2008-10-06 09:54:39 -070055 struct sk_buff *gso_skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 struct sk_buff_head q;
David S. Millerbb949fb2008-07-08 16:55:56 -070057 struct netdev_queue *dev_queue;
David S. Miller37437bb2008-07-16 02:15:04 -070058 struct Qdisc *next_sched;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 int (*reshape_fail)(struct sk_buff *skb,
65 struct Qdisc *q);
66
David S. Miller72b25a92008-07-18 20:54:17 -070067 void *u32_node;
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 /* 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
75struct 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);
Patrick McHardy43effa12006-11-29 17:35:48 -080081 void (*qlen_notify)(struct Qdisc *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
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,
Patrick McHardy1e904742008-01-22 22:11:17 -080087 struct nlattr **, unsigned long *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 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
104struct Qdisc_ops
105{
106 struct Qdisc_ops *next;
Eric Dumazet20fea082007-11-14 01:44:41 -0800107 const struct Qdisc_class_ops *cl_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 char id[IFNAMSIZ];
109 int priv_size;
110
111 int (*enqueue)(struct sk_buff *, struct Qdisc *);
112 struct sk_buff * (*dequeue)(struct Qdisc *);
Jarek Poplawski90d841fd2008-10-31 00:43:45 -0700113 struct sk_buff * (*peek)(struct Qdisc *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 unsigned int (*drop)(struct Qdisc *);
115
Patrick McHardy1e904742008-01-22 22:11:17 -0800116 int (*init)(struct Qdisc *, struct nlattr *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 void (*reset)(struct Qdisc *);
118 void (*destroy)(struct Qdisc *);
Patrick McHardy1e904742008-01-22 22:11:17 -0800119 int (*change)(struct Qdisc *, struct nlattr *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
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
128struct tcf_result
129{
130 unsigned long class;
131 u32 classid;
132};
133
134struct 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,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800147 u32 handle, struct nlattr **,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 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
159struct 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 *);
Al Viro66c6f522006-11-20 18:07:51 -0800166 __be16 protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
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
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700176struct qdisc_skb_cb {
177 unsigned int pkt_len;
178 char data[];
179};
180
181static inline struct qdisc_skb_cb *qdisc_skb_cb(struct sk_buff *skb)
182{
183 return (struct qdisc_skb_cb *)skb->cb;
184}
185
David S. Miller83874002008-07-17 00:53:03 -0700186static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
187{
188 return &qdisc->q.lock;
189}
190
David S. Miller7698b4f2008-07-16 01:42:40 -0700191static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
192{
193 return qdisc->dev_queue->qdisc;
194}
195
Jarek Poplawski2540e052008-08-21 05:11:14 -0700196static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
197{
198 return qdisc->dev_queue->qdisc_sleeping;
199}
200
David S. Miller7e43f112008-08-02 23:27:37 -0700201/* 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 */
David S. Miller7698b4f2008-07-16 01:42:40 -0700212static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
213{
214 struct Qdisc *root = qdisc_root(qdisc);
215
David S. Miller7e43f112008-08-02 23:27:37 -0700216 ASSERT_RTNL();
David S. Miller83874002008-07-17 00:53:03 -0700217 return qdisc_lock(root);
David S. Miller7698b4f2008-07-16 01:42:40 -0700218}
219
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700220static 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
David S. Miller5ce2d482008-07-08 17:06:30 -0700228static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
229{
230 return qdisc->dev_queue->dev;
231}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
David S. Miller78a5b302008-07-16 03:12:24 -0700233static inline void sch_tree_lock(struct Qdisc *q)
234{
Jarek Poplawskife439dd2008-08-27 02:27:10 -0700235 spin_lock_bh(qdisc_root_sleeping_lock(q));
David S. Miller78a5b302008-07-16 03:12:24 -0700236}
237
238static inline void sch_tree_unlock(struct Qdisc *q)
239{
Jarek Poplawskife439dd2008-08-27 02:27:10 -0700240 spin_unlock_bh(qdisc_root_sleeping_lock(q));
David S. Miller78a5b302008-07-16 03:12:24 -0700241}
242
243#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
244#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Thomas Grafe41a33e2005-07-05 14:14:30 -0700246extern struct Qdisc noop_qdisc;
247extern struct Qdisc_ops noop_qdisc_ops;
248
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700249struct Qdisc_class_common
250{
251 u32 classid;
252 struct hlist_node hnode;
253};
254
255struct Qdisc_class_hash
256{
257 struct hlist_head *hash;
258 unsigned int hashsize;
259 unsigned int hashmask;
260 unsigned int hashelems;
261};
262
263static 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
270static inline struct Qdisc_class_common *
271qdisc_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
285extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
286extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
287extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
288extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
289extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
290
Thomas Grafe41a33e2005-07-05 14:14:30 -0700291extern void dev_init_scheduler(struct net_device *dev);
292extern void dev_shutdown(struct net_device *dev);
293extern void dev_activate(struct net_device *dev);
294extern void dev_deactivate(struct net_device *dev);
295extern void qdisc_reset(struct Qdisc *qdisc);
296extern void qdisc_destroy(struct Qdisc *qdisc);
Patrick McHardy43effa12006-11-29 17:35:48 -0800297extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
David S. Miller5ce2d482008-07-08 17:06:30 -0700298extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
David S. Millerbb949fb2008-07-08 16:55:56 -0700299 struct Qdisc_ops *ops);
Thomas Grafe41a33e2005-07-05 14:14:30 -0700300extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
David S. Millerbb949fb2008-07-08 16:55:56 -0700301 struct netdev_queue *dev_queue,
Patrick McHardy9f9afec2006-11-29 17:35:18 -0800302 struct Qdisc_ops *ops, u32 parentid);
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700303extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
304 struct qdisc_size_table *stab);
Patrick McHardya48b5a62007-03-23 11:29:43 -0700305extern void tcf_destroy(struct tcf_proto *tp);
Patrick McHardyff31ab52008-07-01 19:52:38 -0700306extern void tcf_destroy_chain(struct tcf_proto **fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
David S. Miller5aa70992008-07-08 22:59:10 -0700308/* Reset all TX qdiscs of a device. */
309static inline void qdisc_reset_all_tx(struct net_device *dev)
310{
David S. Millere8a04642008-07-17 00:34:19 -0700311 unsigned int i;
312 for (i = 0; i < dev->num_tx_queues; i++)
313 qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
David S. Miller5aa70992008-07-08 22:59:10 -0700314}
315
David S. Miller3e745dd2008-07-08 23:00:25 -0700316/* Are all TX queues of the device empty? */
317static inline bool qdisc_all_tx_empty(const struct net_device *dev)
318{
David S. Millere8a04642008-07-17 00:34:19 -0700319 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;
David S. Miller3e745dd2008-07-08 23:00:25 -0700323
David S. Millere8a04642008-07-17 00:34:19 -0700324 if (q->q.qlen)
325 return false;
326 }
327 return true;
David S. Miller3e745dd2008-07-08 23:00:25 -0700328}
329
David S. Miller6fa98642008-07-08 23:01:06 -0700330/* Are any of the TX qdiscs changing? */
331static inline bool qdisc_tx_changing(struct net_device *dev)
332{
David S. Millere8a04642008-07-17 00:34:19 -0700333 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;
David S. Miller6fa98642008-07-08 23:01:06 -0700340}
341
David S. Millere8a04642008-07-17 00:34:19 -0700342/* Is the device using the noop qdisc on all queues? */
David S. Miller05297942008-07-08 23:01:27 -0700343static inline bool qdisc_tx_is_noop(const struct net_device *dev)
344{
David S. Millere8a04642008-07-17 00:34:19 -0700345 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;
David S. Miller05297942008-07-08 23:01:27 -0700352}
353
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700354static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
355{
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700356 return qdisc_skb_cb(skb)->pkt_len;
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700357}
358
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700359/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700360enum net_xmit_qdisc_t {
361 __NET_XMIT_STOLEN = 0x00010000,
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700362 __NET_XMIT_BYPASS = 0x00020000,
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700363};
364
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700365#ifdef CONFIG_NET_CLS_ACT
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700366#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700367#else
368#define net_xmit_drop_count(e) (1)
369#endif
370
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700371static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
372{
David S. Miller3a682fb2008-07-20 18:13:01 -0700373#ifdef CONFIG_NET_SCHED
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700374 if (sch->stab)
375 qdisc_calculate_pkt_len(skb, sch->stab);
David S. Miller3a682fb2008-07-20 18:13:01 -0700376#endif
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700377 return sch->enqueue(skb, sch);
378}
379
380static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
381{
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700382 qdisc_skb_cb(skb)->pkt_len = skb->len;
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700383 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700384}
385
Thomas Graf9972b252005-06-18 22:57:26 -0700386static 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);
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700390 sch->qstats.backlog += qdisc_pkt_len(skb);
391 sch->bstats.bytes += qdisc_pkt_len(skb);
Thomas Graf9972b252005-06-18 22:57:26 -0700392 sch->bstats.packets++;
393
394 return NET_XMIT_SUCCESS;
395}
396
397static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
398{
399 return __qdisc_enqueue_tail(skb, sch, &sch->q);
400}
401
402static 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))
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700408 sch->qstats.backlog -= qdisc_pkt_len(skb);
Thomas Graf9972b252005-06-18 22:57:26 -0700409
410 return skb;
411}
412
413static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
414{
415 return __qdisc_dequeue_head(sch, &sch->q);
416}
417
418static 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))
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700424 sch->qstats.backlog -= qdisc_pkt_len(skb);
Thomas Graf9972b252005-06-18 22:57:26 -0700425
426 return skb;
427}
428
429static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
430{
431 return __qdisc_dequeue_tail(sch, &sch->q);
432}
433
Patrick McHardy48a8f512008-10-31 00:44:18 -0700434static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
435{
436 return skb_peek(&sch->q);
437}
438
Jarek Poplawski77be1552008-10-31 00:47:01 -0700439/* generic pseudo peek method for non-work-conserving qdisc */
440static 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 */
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800443 if (!sch->gso_skb) {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700444 sch->gso_skb = sch->dequeue(sch);
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800445 if (sch->gso_skb)
446 /* it's still part of the queue */
447 sch->q.qlen++;
448 }
Jarek Poplawski77be1552008-10-31 00:47:01 -0700449
450 return sch->gso_skb;
451}
452
453/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
454static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
455{
456 struct sk_buff *skb = sch->gso_skb;
457
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800458 if (skb) {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700459 sch->gso_skb = NULL;
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800460 sch->q.qlen--;
461 } else {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700462 skb = sch->dequeue(sch);
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800463 }
Jarek Poplawski77be1552008-10-31 00:47:01 -0700464
465 return skb;
466}
467
Thomas Graf9972b252005-06-18 22:57:26 -0700468static 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 */
David S. Miller93245dd2008-07-17 04:03:43 -0700475 __skb_queue_purge(list);
Thomas Graf9972b252005-06-18 22:57:26 -0700476}
477
478static inline void qdisc_reset_queue(struct Qdisc *sch)
479{
480 __qdisc_reset_queue(sch, &sch->q);
481 sch->qstats.backlog = 0;
482}
483
484static 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)) {
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700490 unsigned int len = qdisc_pkt_len(skb);
Thomas Graf9972b252005-06-18 22:57:26 -0700491 kfree_skb(skb);
492 return len;
493 }
494
495 return 0;
496}
497
498static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
499{
500 return __qdisc_queue_drop(sch, &sch->q);
501}
502
503static 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
511static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
512{
513 sch->qstats.drops++;
514
Patrick McHardyc3bc7cf2007-07-15 00:03:05 -0700515#ifdef CONFIG_NET_CLS_ACT
Thomas Graf9972b252005-06-18 22:57:26 -0700516 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
517 goto drop;
518
519 return NET_XMIT_SUCCESS;
520
521drop:
522#endif
523 kfree_skb(skb);
524 return NET_XMIT_DROP;
525}
526
Jesper Dangaard Brouere9bef552007-09-12 16:35:24 +0200527/* 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 */
530static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
531{
Jesper Dangaard Brouere08b0992007-09-12 16:36:28 +0200532 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
533 if (slot < 0)
534 slot = 0;
Jesper Dangaard Brouere9bef552007-09-12 16:35:24 +0200535 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
Jamal Hadi Salim12da81d2007-10-26 02:47:23 -0700541#ifdef CONFIG_NET_CLS_ACT
542static 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);
Jamal Hadi Salim12da81d2007-10-26 02:47:23 -0700550 }
551 return n;
552}
553#endif
554
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555#endif