blob: 55ce96b53b092e3ca04db6eaa7d6888fb9f478bc [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <linux/pkt_sched.h>
8#include <linux/pkt_cls.h>
9#include <net/gen_stats.h>
Thomas Grafbe577dd2007-03-22 11:55:50 -070010#include <net/rtnetlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011
12struct Qdisc_ops;
13struct qdisc_walker;
14struct tcf_walker;
15struct module;
16
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000017struct qdisc_rate_table {
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 struct tc_ratespec rate;
19 u32 data[256];
20 struct qdisc_rate_table *next;
21 int refcnt;
22};
23
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000024enum qdisc_state_t {
David S. Miller37437bb2008-07-16 02:15:04 -070025 __QDISC_STATE_SCHED,
David S. Millera9312ae2008-08-17 21:51:03 -070026 __QDISC_STATE_DEACTIVATED,
Eric Dumazetef352e72011-03-24 00:13:14 -070027 __QDISC_STATE_THROTTLED,
David S. Millere2627c82008-07-16 00:56:32 -070028};
29
Eric Dumazet37112102010-06-02 03:24:13 -070030/*
31 * following bits are only changed while qdisc lock is held
32 */
33enum qdisc___state_t {
Eric Dumazetfd245a42011-01-20 05:27:16 +000034 __QDISC___STATE_RUNNING = 1,
Eric Dumazet37112102010-06-02 03:24:13 -070035};
36
Jussi Kivilinna175f9c12008-07-20 00:08:47 -070037struct qdisc_size_table {
Eric Dumazeta2da5702011-01-20 03:48:19 +000038 struct rcu_head rcu;
Jussi Kivilinna175f9c12008-07-20 00:08:47 -070039 struct list_head list;
40 struct tc_sizespec szopts;
41 int refcnt;
42 u16 data[];
43};
44
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000045struct Qdisc {
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
47 struct sk_buff * (*dequeue)(struct Qdisc *dev);
Eric Dumazet05bdd2f2011-10-20 17:45:43 -040048 unsigned int flags;
Jarek Poplawskib00355d2009-02-01 01:12:42 -080049#define TCQ_F_BUILTIN 1
Eric Dumazetfd245a42011-01-20 05:27:16 +000050#define TCQ_F_INGRESS 2
51#define TCQ_F_CAN_BYPASS 4
52#define TCQ_F_MQROOT 8
Jarek Poplawskib00355d2009-02-01 01:12:42 -080053#define TCQ_F_WARN_NONWC (1 << 16)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 int padded;
Eric Dumazet05bdd2f2011-10-20 17:45:43 -040055 const struct Qdisc_ops *ops;
Eric Dumazeta2da5702011-01-20 03:48:19 +000056 struct qdisc_size_table __rcu *stab;
Eric Dumazet5e140df2009-03-20 01:33:32 -070057 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 u32 handle;
59 u32 parent;
60 atomic_t refcnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 struct gnet_stats_rate_est rate_est;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 int (*reshape_fail)(struct sk_buff *skb,
63 struct Qdisc *q);
64
David S. Miller72b25a92008-07-18 20:54:17 -070065 void *u32_node;
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 /* This field is deprecated, but it is still used by CBQ
68 * and it will live until better solution will be invented.
69 */
70 struct Qdisc *__parent;
Eric Dumazet5e140df2009-03-20 01:33:32 -070071 struct netdev_queue *dev_queue;
72 struct Qdisc *next_sched;
73
74 struct sk_buff *gso_skb;
75 /*
76 * For performance sake on SMP, we put highly modified fields at the end
77 */
78 unsigned long state;
79 struct sk_buff_head q;
Eric Dumazetc1a8f1f2009-08-16 09:36:49 +000080 struct gnet_stats_basic_packed bstats;
Eric Dumazetfd245a42011-01-20 05:27:16 +000081 unsigned int __state;
Eric Dumazet5e140df2009-03-20 01:33:32 -070082 struct gnet_stats_queue qstats;
Eric Dumazet79640a42010-06-02 05:09:29 -070083 struct rcu_head rcu_head;
84 spinlock_t busylock;
Eric Dumazetd2760552011-03-03 11:10:02 -080085 u32 limit;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086};
87
Eric Dumazetfd245a42011-01-20 05:27:16 +000088static inline bool qdisc_is_running(const struct Qdisc *qdisc)
Eric Dumazetbc135b22010-06-02 03:23:51 -070089{
Eric Dumazetfd245a42011-01-20 05:27:16 +000090 return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
Eric Dumazetbc135b22010-06-02 03:23:51 -070091}
92
93static inline bool qdisc_run_begin(struct Qdisc *qdisc)
94{
Eric Dumazetfd245a42011-01-20 05:27:16 +000095 if (qdisc_is_running(qdisc))
96 return false;
97 qdisc->__state |= __QDISC___STATE_RUNNING;
98 return true;
Eric Dumazetbc135b22010-06-02 03:23:51 -070099}
100
101static inline void qdisc_run_end(struct Qdisc *qdisc)
102{
Eric Dumazetfd245a42011-01-20 05:27:16 +0000103 qdisc->__state &= ~__QDISC___STATE_RUNNING;
104}
105
106static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
107{
Eric Dumazetef352e72011-03-24 00:13:14 -0700108 return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
Eric Dumazetfd245a42011-01-20 05:27:16 +0000109}
110
111static inline void qdisc_throttled(struct Qdisc *qdisc)
112{
Eric Dumazetef352e72011-03-24 00:13:14 -0700113 set_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
Eric Dumazetfd245a42011-01-20 05:27:16 +0000114}
115
116static inline void qdisc_unthrottled(struct Qdisc *qdisc)
117{
Eric Dumazetef352e72011-03-24 00:13:14 -0700118 clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
Eric Dumazetbc135b22010-06-02 03:23:51 -0700119}
120
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000121struct Qdisc_class_ops {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 /* Child qdisc manipulation */
Jarek Poplawski926e61b2009-09-15 02:53:07 -0700123 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 int (*graft)(struct Qdisc *, unsigned long cl,
125 struct Qdisc *, struct Qdisc **);
126 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
Patrick McHardy43effa12006-11-29 17:35:48 -0800127 void (*qlen_notify)(struct Qdisc *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129 /* Class manipulation routines */
130 unsigned long (*get)(struct Qdisc *, u32 classid);
131 void (*put)(struct Qdisc *, unsigned long);
132 int (*change)(struct Qdisc *, u32, u32,
Patrick McHardy1e904742008-01-22 22:11:17 -0800133 struct nlattr **, unsigned long *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 int (*delete)(struct Qdisc *, unsigned long);
135 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
136
137 /* Filter manipulation */
138 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
139 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
140 u32 classid);
141 void (*unbind_tcf)(struct Qdisc *, unsigned long);
142
143 /* rtnetlink specific */
144 int (*dump)(struct Qdisc *, unsigned long,
145 struct sk_buff *skb, struct tcmsg*);
146 int (*dump_stats)(struct Qdisc *, unsigned long,
147 struct gnet_dump *);
148};
149
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000150struct Qdisc_ops {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 struct Qdisc_ops *next;
Eric Dumazet20fea082007-11-14 01:44:41 -0800152 const struct Qdisc_class_ops *cl_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 char id[IFNAMSIZ];
154 int priv_size;
155
156 int (*enqueue)(struct sk_buff *, struct Qdisc *);
157 struct sk_buff * (*dequeue)(struct Qdisc *);
Jarek Poplawski90d841fd2008-10-31 00:43:45 -0700158 struct sk_buff * (*peek)(struct Qdisc *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 unsigned int (*drop)(struct Qdisc *);
160
Patrick McHardy1e904742008-01-22 22:11:17 -0800161 int (*init)(struct Qdisc *, struct nlattr *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 void (*reset)(struct Qdisc *);
163 void (*destroy)(struct Qdisc *);
Patrick McHardy1e904742008-01-22 22:11:17 -0800164 int (*change)(struct Qdisc *, struct nlattr *arg);
David S. Miller6ec1c692009-09-06 01:58:51 -0700165 void (*attach)(struct Qdisc *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
167 int (*dump)(struct Qdisc *, struct sk_buff *);
168 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
169
170 struct module *owner;
171};
172
173
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000174struct tcf_result {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 unsigned long class;
176 u32 classid;
177};
178
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000179struct tcf_proto_ops {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 struct tcf_proto_ops *next;
181 char kind[IFNAMSIZ];
182
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000183 int (*classify)(struct sk_buff *,
184 const struct tcf_proto *,
185 struct tcf_result *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 int (*init)(struct tcf_proto*);
187 void (*destroy)(struct tcf_proto*);
188
189 unsigned long (*get)(struct tcf_proto*, u32 handle);
190 void (*put)(struct tcf_proto*, unsigned long);
191 int (*change)(struct tcf_proto*, unsigned long,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800192 u32 handle, struct nlattr **,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 unsigned long *);
194 int (*delete)(struct tcf_proto*, unsigned long);
195 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
196
197 /* rtnetlink specific */
198 int (*dump)(struct tcf_proto*, unsigned long,
199 struct sk_buff *skb, struct tcmsg*);
200
201 struct module *owner;
202};
203
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000204struct tcf_proto {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 /* Fast access part */
206 struct tcf_proto *next;
207 void *root;
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000208 int (*classify)(struct sk_buff *,
209 const struct tcf_proto *,
210 struct tcf_result *);
Al Viro66c6f522006-11-20 18:07:51 -0800211 __be16 protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213 /* All the rest */
214 u32 prio;
215 u32 classid;
216 struct Qdisc *q;
217 void *data;
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000218 const struct tcf_proto_ops *ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219};
220
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700221struct qdisc_skb_cb {
222 unsigned int pkt_len;
David S. Miller16bda132012-02-06 15:14:37 -0500223 unsigned char data[24];
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700224};
225
David S. Miller16bda132012-02-06 15:14:37 -0500226static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
227{
228 struct qdisc_skb_cb *qcb;
229 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(unsigned int) + sz);
230 BUILD_BUG_ON(sizeof(qcb->data) < sz);
231}
232
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400233static inline int qdisc_qlen(const struct Qdisc *q)
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +0000234{
235 return q->q.qlen;
236}
237
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000238static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700239{
240 return (struct qdisc_skb_cb *)skb->cb;
241}
242
David S. Miller83874002008-07-17 00:53:03 -0700243static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
244{
245 return &qdisc->q.lock;
246}
247
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400248static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
David S. Miller7698b4f2008-07-16 01:42:40 -0700249{
250 return qdisc->dev_queue->qdisc;
251}
252
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400253static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
Jarek Poplawski2540e052008-08-21 05:11:14 -0700254{
255 return qdisc->dev_queue->qdisc_sleeping;
256}
257
David S. Miller7e43f112008-08-02 23:27:37 -0700258/* The qdisc root lock is a mechanism by which to top level
259 * of a qdisc tree can be locked from any qdisc node in the
260 * forest. This allows changing the configuration of some
261 * aspect of the qdisc tree while blocking out asynchronous
262 * qdisc access in the packet processing paths.
263 *
264 * It is only legal to do this when the root will not change
265 * on us. Otherwise we'll potentially lock the wrong qdisc
266 * root. This is enforced by holding the RTNL semaphore, which
267 * all users of this lock accessor must do.
268 */
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400269static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
David S. Miller7698b4f2008-07-16 01:42:40 -0700270{
271 struct Qdisc *root = qdisc_root(qdisc);
272
David S. Miller7e43f112008-08-02 23:27:37 -0700273 ASSERT_RTNL();
David S. Miller83874002008-07-17 00:53:03 -0700274 return qdisc_lock(root);
David S. Miller7698b4f2008-07-16 01:42:40 -0700275}
276
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400277static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700278{
279 struct Qdisc *root = qdisc_root_sleeping(qdisc);
280
281 ASSERT_RTNL();
282 return qdisc_lock(root);
283}
284
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400285static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
David S. Miller5ce2d482008-07-08 17:06:30 -0700286{
287 return qdisc->dev_queue->dev;
288}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400290static inline void sch_tree_lock(const struct Qdisc *q)
David S. Miller78a5b302008-07-16 03:12:24 -0700291{
Jarek Poplawskife439dd2008-08-27 02:27:10 -0700292 spin_lock_bh(qdisc_root_sleeping_lock(q));
David S. Miller78a5b302008-07-16 03:12:24 -0700293}
294
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400295static inline void sch_tree_unlock(const struct Qdisc *q)
David S. Miller78a5b302008-07-16 03:12:24 -0700296{
Jarek Poplawskife439dd2008-08-27 02:27:10 -0700297 spin_unlock_bh(qdisc_root_sleeping_lock(q));
David S. Miller78a5b302008-07-16 03:12:24 -0700298}
299
300#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
301#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
Thomas Grafe41a33e2005-07-05 14:14:30 -0700303extern struct Qdisc noop_qdisc;
304extern struct Qdisc_ops noop_qdisc_ops;
David S. Miller6ec1c692009-09-06 01:58:51 -0700305extern struct Qdisc_ops pfifo_fast_ops;
306extern struct Qdisc_ops mq_qdisc_ops;
Thomas Grafe41a33e2005-07-05 14:14:30 -0700307
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000308struct Qdisc_class_common {
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700309 u32 classid;
310 struct hlist_node hnode;
311};
312
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000313struct Qdisc_class_hash {
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700314 struct hlist_head *hash;
315 unsigned int hashsize;
316 unsigned int hashmask;
317 unsigned int hashelems;
318};
319
320static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
321{
322 id ^= id >> 8;
323 id ^= id >> 4;
324 return id & mask;
325}
326
327static inline struct Qdisc_class_common *
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400328qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700329{
330 struct Qdisc_class_common *cl;
331 struct hlist_node *n;
332 unsigned int h;
333
334 h = qdisc_class_hash(id, hash->hashmask);
335 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
336 if (cl->classid == id)
337 return cl;
338 }
339 return NULL;
340}
341
342extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
343extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
344extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
345extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
346extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
347
Thomas Grafe41a33e2005-07-05 14:14:30 -0700348extern void dev_init_scheduler(struct net_device *dev);
349extern void dev_shutdown(struct net_device *dev);
350extern void dev_activate(struct net_device *dev);
351extern void dev_deactivate(struct net_device *dev);
Octavian Purdila44345722010-12-13 12:44:07 +0000352extern void dev_deactivate_many(struct list_head *head);
Patrick McHardy589983c2009-09-04 06:41:20 +0000353extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
354 struct Qdisc *qdisc);
Thomas Grafe41a33e2005-07-05 14:14:30 -0700355extern void qdisc_reset(struct Qdisc *qdisc);
356extern void qdisc_destroy(struct Qdisc *qdisc);
Patrick McHardy43effa12006-11-29 17:35:48 -0800357extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
David S. Miller5ce2d482008-07-08 17:06:30 -0700358extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
David S. Millerbb949fb2008-07-08 16:55:56 -0700359 struct Qdisc_ops *ops);
Changli Gao3511c912010-10-16 13:04:08 +0000360extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
Patrick McHardy9f9afec2006-11-29 17:35:18 -0800361 struct Qdisc_ops *ops, u32 parentid);
Eric Dumazeta2da5702011-01-20 03:48:19 +0000362extern void __qdisc_calculate_pkt_len(struct sk_buff *skb,
363 const struct qdisc_size_table *stab);
Patrick McHardya48b5a62007-03-23 11:29:43 -0700364extern void tcf_destroy(struct tcf_proto *tp);
Patrick McHardyff31ab52008-07-01 19:52:38 -0700365extern void tcf_destroy_chain(struct tcf_proto **fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
John Fastabendf0796d52010-07-01 13:21:57 +0000367/* Reset all TX qdiscs greater then index of a device. */
368static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
David S. Miller5aa70992008-07-08 22:59:10 -0700369{
John Fastabend4ef6acf2010-07-01 13:21:35 +0000370 struct Qdisc *qdisc;
371
John Fastabendf0796d52010-07-01 13:21:57 +0000372 for (; i < dev->num_tx_queues; i++) {
John Fastabend4ef6acf2010-07-01 13:21:35 +0000373 qdisc = netdev_get_tx_queue(dev, i)->qdisc;
374 if (qdisc) {
375 spin_lock_bh(qdisc_lock(qdisc));
376 qdisc_reset(qdisc);
377 spin_unlock_bh(qdisc_lock(qdisc));
378 }
379 }
David S. Miller5aa70992008-07-08 22:59:10 -0700380}
381
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382static inline void qdisc_reset_all_tx(struct net_device *dev)
Thomas Graf9972b252005-06-18 22:57:26 -0700383{
John Fastabendf0796d52010-07-01 13:21:57 +0000384 qdisc_reset_all_tx_gt(dev, 0);
Thomas Graf9972b252005-06-18 22:57:26 -0700385}
386
David S. Miller3e745dd2008-07-08 23:00:25 -0700387/* Are all TX queues of the device empty? */
388static inline bool qdisc_all_tx_empty(const struct net_device *dev)
389{
David S. Millere8a04642008-07-17 00:34:19 -0700390 unsigned int i;
391 for (i = 0; i < dev->num_tx_queues; i++) {
392 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
393 const struct Qdisc *q = txq->qdisc;
David S. Miller3e745dd2008-07-08 23:00:25 -0700394
David S. Millere8a04642008-07-17 00:34:19 -0700395 if (q->q.qlen)
396 return false;
397 }
398 return true;
David S. Miller3e745dd2008-07-08 23:00:25 -0700399}
400
David S. Miller6fa98642008-07-08 23:01:06 -0700401/* Are any of the TX qdiscs changing? */
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400402static inline bool qdisc_tx_changing(const struct net_device *dev)
David S. Miller6fa98642008-07-08 23:01:06 -0700403{
David S. Millere8a04642008-07-17 00:34:19 -0700404 unsigned int i;
405 for (i = 0; i < dev->num_tx_queues; i++) {
406 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
407 if (txq->qdisc != txq->qdisc_sleeping)
408 return true;
409 }
410 return false;
David S. Miller6fa98642008-07-08 23:01:06 -0700411}
412
David S. Millere8a04642008-07-17 00:34:19 -0700413/* Is the device using the noop qdisc on all queues? */
David S. Miller05297942008-07-08 23:01:27 -0700414static inline bool qdisc_tx_is_noop(const struct net_device *dev)
415{
David S. Millere8a04642008-07-17 00:34:19 -0700416 unsigned int i;
417 for (i = 0; i < dev->num_tx_queues; i++) {
418 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
419 if (txq->qdisc != &noop_qdisc)
420 return false;
421 }
422 return true;
David S. Miller05297942008-07-08 23:01:27 -0700423}
424
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000425static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700426{
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700427 return qdisc_skb_cb(skb)->pkt_len;
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700428}
429
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700430/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700431enum net_xmit_qdisc_t {
432 __NET_XMIT_STOLEN = 0x00010000,
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700433 __NET_XMIT_BYPASS = 0x00020000,
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700434};
435
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700436#ifdef CONFIG_NET_CLS_ACT
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700437#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700438#else
439#define net_xmit_drop_count(e) (1)
440#endif
441
Eric Dumazeta2da5702011-01-20 03:48:19 +0000442static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
443 const struct Qdisc *sch)
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700444{
David S. Miller3a682fb2008-07-20 18:13:01 -0700445#ifdef CONFIG_NET_SCHED
Eric Dumazeta2da5702011-01-20 03:48:19 +0000446 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
447
448 if (stab)
449 __qdisc_calculate_pkt_len(skb, stab);
David S. Miller3a682fb2008-07-20 18:13:01 -0700450#endif
Eric Dumazeta2da5702011-01-20 03:48:19 +0000451}
452
453static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
454{
455 qdisc_calculate_pkt_len(skb, sch);
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700456 return sch->enqueue(skb, sch);
457}
458
459static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
460{
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700461 qdisc_skb_cb(skb)->pkt_len = skb->len;
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700462 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700463}
464
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000465
466static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
467 const struct sk_buff *skb)
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +0000468{
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000469 bstats->bytes += qdisc_pkt_len(skb);
470 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
471}
472
473static inline void qdisc_bstats_update(struct Qdisc *sch,
474 const struct sk_buff *skb)
475{
476 bstats_update(&sch->bstats, skb);
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +0000477}
478
Thomas Graf9972b252005-06-18 22:57:26 -0700479static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
480 struct sk_buff_head *list)
481{
482 __skb_queue_tail(list, skb);
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700483 sch->qstats.backlog += qdisc_pkt_len(skb);
Thomas Graf9972b252005-06-18 22:57:26 -0700484
485 return NET_XMIT_SUCCESS;
486}
487
488static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
489{
490 return __qdisc_enqueue_tail(skb, sch, &sch->q);
491}
492
493static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
494 struct sk_buff_head *list)
495{
496 struct sk_buff *skb = __skb_dequeue(list);
497
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800498 if (likely(skb != NULL)) {
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700499 sch->qstats.backlog -= qdisc_pkt_len(skb);
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800500 qdisc_bstats_update(sch, skb);
501 }
Thomas Graf9972b252005-06-18 22:57:26 -0700502
503 return skb;
504}
505
506static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
507{
508 return __qdisc_dequeue_head(sch, &sch->q);
509}
510
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000511static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
512 struct sk_buff_head *list)
513{
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800514 struct sk_buff *skb = __skb_dequeue(list);
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000515
516 if (likely(skb != NULL)) {
517 unsigned int len = qdisc_pkt_len(skb);
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800518 sch->qstats.backlog -= len;
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000519 kfree_skb(skb);
520 return len;
521 }
522
523 return 0;
524}
525
526static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
527{
528 return __qdisc_queue_drop_head(sch, &sch->q);
529}
530
Thomas Graf9972b252005-06-18 22:57:26 -0700531static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
532 struct sk_buff_head *list)
533{
534 struct sk_buff *skb = __skb_dequeue_tail(list);
535
536 if (likely(skb != NULL))
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700537 sch->qstats.backlog -= qdisc_pkt_len(skb);
Thomas Graf9972b252005-06-18 22:57:26 -0700538
539 return skb;
540}
541
542static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
543{
544 return __qdisc_dequeue_tail(sch, &sch->q);
545}
546
Patrick McHardy48a8f512008-10-31 00:44:18 -0700547static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
548{
549 return skb_peek(&sch->q);
550}
551
Jarek Poplawski77be1552008-10-31 00:47:01 -0700552/* generic pseudo peek method for non-work-conserving qdisc */
553static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
554{
555 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800556 if (!sch->gso_skb) {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700557 sch->gso_skb = sch->dequeue(sch);
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800558 if (sch->gso_skb)
559 /* it's still part of the queue */
560 sch->q.qlen++;
561 }
Jarek Poplawski77be1552008-10-31 00:47:01 -0700562
563 return sch->gso_skb;
564}
565
566/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
567static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
568{
569 struct sk_buff *skb = sch->gso_skb;
570
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800571 if (skb) {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700572 sch->gso_skb = NULL;
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800573 sch->q.qlen--;
574 } else {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700575 skb = sch->dequeue(sch);
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800576 }
Jarek Poplawski77be1552008-10-31 00:47:01 -0700577
578 return skb;
579}
580
Thomas Graf9972b252005-06-18 22:57:26 -0700581static inline void __qdisc_reset_queue(struct Qdisc *sch,
582 struct sk_buff_head *list)
583{
584 /*
585 * We do not know the backlog in bytes of this list, it
586 * is up to the caller to correct it
587 */
David S. Miller93245dd2008-07-17 04:03:43 -0700588 __skb_queue_purge(list);
Thomas Graf9972b252005-06-18 22:57:26 -0700589}
590
591static inline void qdisc_reset_queue(struct Qdisc *sch)
592{
593 __qdisc_reset_queue(sch, &sch->q);
594 sch->qstats.backlog = 0;
595}
596
597static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
598 struct sk_buff_head *list)
599{
600 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
601
602 if (likely(skb != NULL)) {
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700603 unsigned int len = qdisc_pkt_len(skb);
Thomas Graf9972b252005-06-18 22:57:26 -0700604 kfree_skb(skb);
605 return len;
606 }
607
608 return 0;
609}
610
611static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
612{
613 return __qdisc_queue_drop(sch, &sch->q);
614}
615
616static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
617{
618 kfree_skb(skb);
619 sch->qstats.drops++;
620
621 return NET_XMIT_DROP;
622}
623
624static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
625{
626 sch->qstats.drops++;
627
Patrick McHardyc3bc7cf2007-07-15 00:03:05 -0700628#ifdef CONFIG_NET_CLS_ACT
Thomas Graf9972b252005-06-18 22:57:26 -0700629 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
630 goto drop;
631
632 return NET_XMIT_SUCCESS;
633
634drop:
635#endif
636 kfree_skb(skb);
637 return NET_XMIT_DROP;
638}
639
Jesper Dangaard Brouere9bef552007-09-12 16:35:24 +0200640/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
641 long it will take to send a packet given its size.
642 */
643static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
644{
Jesper Dangaard Brouere08b0992007-09-12 16:36:28 +0200645 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
646 if (slot < 0)
647 slot = 0;
Jesper Dangaard Brouere9bef552007-09-12 16:35:24 +0200648 slot >>= rtab->rate.cell_log;
649 if (slot > 255)
Eric Dumazeta02cec22010-09-22 20:43:57 +0000650 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
Jesper Dangaard Brouere9bef552007-09-12 16:35:24 +0200651 return rtab->data[slot];
652}
653
Jamal Hadi Salim12da81d2007-10-26 02:47:23 -0700654#ifdef CONFIG_NET_CLS_ACT
Changli Gao210d6de2010-06-24 16:25:12 +0000655static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
656 int action)
Jamal Hadi Salim12da81d2007-10-26 02:47:23 -0700657{
Changli Gao210d6de2010-06-24 16:25:12 +0000658 struct sk_buff *n;
659
Changli Gao17302102010-12-20 04:35:30 +0000660 n = skb_clone(skb, gfp_mask);
Jamal Hadi Salim12da81d2007-10-26 02:47:23 -0700661
662 if (n) {
663 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
664 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
665 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
Jamal Hadi Salim12da81d2007-10-26 02:47:23 -0700666 }
667 return n;
668}
669#endif
670
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671#endif