blob: d9611e03241873fd5cb4140cf0d9c5e3ae7a2486 [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;
Jiri Pirkodf4ab5b2012-07-20 02:28:49 +0000223 u16 slave_dev_queue_mapping;
Eric Dumazet5ee31c682012-06-12 06:03:51 +0000224 u16 _pad;
225 unsigned char data[20];
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700226};
227
David S. Miller16bda132012-02-06 15:14:37 -0500228static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
229{
230 struct qdisc_skb_cb *qcb;
Eric Dumazet5ee31c682012-06-12 06:03:51 +0000231
232 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
David S. Miller16bda132012-02-06 15:14:37 -0500233 BUILD_BUG_ON(sizeof(qcb->data) < sz);
234}
235
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400236static inline int qdisc_qlen(const struct Qdisc *q)
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +0000237{
238 return q->q.qlen;
239}
240
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000241static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700242{
243 return (struct qdisc_skb_cb *)skb->cb;
244}
245
David S. Miller83874002008-07-17 00:53:03 -0700246static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
247{
248 return &qdisc->q.lock;
249}
250
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400251static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
David S. Miller7698b4f2008-07-16 01:42:40 -0700252{
253 return qdisc->dev_queue->qdisc;
254}
255
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400256static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
Jarek Poplawski2540e052008-08-21 05:11:14 -0700257{
258 return qdisc->dev_queue->qdisc_sleeping;
259}
260
David S. Miller7e43f112008-08-02 23:27:37 -0700261/* The qdisc root lock is a mechanism by which to top level
262 * of a qdisc tree can be locked from any qdisc node in the
263 * forest. This allows changing the configuration of some
264 * aspect of the qdisc tree while blocking out asynchronous
265 * qdisc access in the packet processing paths.
266 *
267 * It is only legal to do this when the root will not change
268 * on us. Otherwise we'll potentially lock the wrong qdisc
269 * root. This is enforced by holding the RTNL semaphore, which
270 * all users of this lock accessor must do.
271 */
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400272static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
David S. Miller7698b4f2008-07-16 01:42:40 -0700273{
274 struct Qdisc *root = qdisc_root(qdisc);
275
David S. Miller7e43f112008-08-02 23:27:37 -0700276 ASSERT_RTNL();
David S. Miller83874002008-07-17 00:53:03 -0700277 return qdisc_lock(root);
David S. Miller7698b4f2008-07-16 01:42:40 -0700278}
279
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400280static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700281{
282 struct Qdisc *root = qdisc_root_sleeping(qdisc);
283
284 ASSERT_RTNL();
285 return qdisc_lock(root);
286}
287
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400288static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
David S. Miller5ce2d482008-07-08 17:06:30 -0700289{
290 return qdisc->dev_queue->dev;
291}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400293static inline void sch_tree_lock(const struct Qdisc *q)
David S. Miller78a5b302008-07-16 03:12:24 -0700294{
Jarek Poplawskife439dd2008-08-27 02:27:10 -0700295 spin_lock_bh(qdisc_root_sleeping_lock(q));
David S. Miller78a5b302008-07-16 03:12:24 -0700296}
297
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400298static inline void sch_tree_unlock(const struct Qdisc *q)
David S. Miller78a5b302008-07-16 03:12:24 -0700299{
Jarek Poplawskife439dd2008-08-27 02:27:10 -0700300 spin_unlock_bh(qdisc_root_sleeping_lock(q));
David S. Miller78a5b302008-07-16 03:12:24 -0700301}
302
303#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
304#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
Thomas Grafe41a33e2005-07-05 14:14:30 -0700306extern struct Qdisc noop_qdisc;
307extern struct Qdisc_ops noop_qdisc_ops;
David S. Miller6ec1c692009-09-06 01:58:51 -0700308extern struct Qdisc_ops pfifo_fast_ops;
309extern struct Qdisc_ops mq_qdisc_ops;
Thomas Grafe41a33e2005-07-05 14:14:30 -0700310
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000311struct Qdisc_class_common {
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700312 u32 classid;
313 struct hlist_node hnode;
314};
315
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000316struct Qdisc_class_hash {
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700317 struct hlist_head *hash;
318 unsigned int hashsize;
319 unsigned int hashmask;
320 unsigned int hashelems;
321};
322
323static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
324{
325 id ^= id >> 8;
326 id ^= id >> 4;
327 return id & mask;
328}
329
330static inline struct Qdisc_class_common *
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400331qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700332{
333 struct Qdisc_class_common *cl;
334 struct hlist_node *n;
335 unsigned int h;
336
337 h = qdisc_class_hash(id, hash->hashmask);
338 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
339 if (cl->classid == id)
340 return cl;
341 }
342 return NULL;
343}
344
345extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
346extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
347extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
348extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
349extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
350
Thomas Grafe41a33e2005-07-05 14:14:30 -0700351extern void dev_init_scheduler(struct net_device *dev);
352extern void dev_shutdown(struct net_device *dev);
353extern void dev_activate(struct net_device *dev);
354extern void dev_deactivate(struct net_device *dev);
Octavian Purdila44345722010-12-13 12:44:07 +0000355extern void dev_deactivate_many(struct list_head *head);
Patrick McHardy589983c2009-09-04 06:41:20 +0000356extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
357 struct Qdisc *qdisc);
Thomas Grafe41a33e2005-07-05 14:14:30 -0700358extern void qdisc_reset(struct Qdisc *qdisc);
359extern void qdisc_destroy(struct Qdisc *qdisc);
Patrick McHardy43effa12006-11-29 17:35:48 -0800360extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
David S. Miller5ce2d482008-07-08 17:06:30 -0700361extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
David S. Millerbb949fb2008-07-08 16:55:56 -0700362 struct Qdisc_ops *ops);
Changli Gao3511c912010-10-16 13:04:08 +0000363extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
Patrick McHardy9f9afec2006-11-29 17:35:18 -0800364 struct Qdisc_ops *ops, u32 parentid);
Eric Dumazeta2da5702011-01-20 03:48:19 +0000365extern void __qdisc_calculate_pkt_len(struct sk_buff *skb,
366 const struct qdisc_size_table *stab);
Patrick McHardya48b5a62007-03-23 11:29:43 -0700367extern void tcf_destroy(struct tcf_proto *tp);
Patrick McHardyff31ab52008-07-01 19:52:38 -0700368extern void tcf_destroy_chain(struct tcf_proto **fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
John Fastabendf0796d52010-07-01 13:21:57 +0000370/* Reset all TX qdiscs greater then index of a device. */
371static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
David S. Miller5aa70992008-07-08 22:59:10 -0700372{
John Fastabend4ef6acf2010-07-01 13:21:35 +0000373 struct Qdisc *qdisc;
374
John Fastabendf0796d52010-07-01 13:21:57 +0000375 for (; i < dev->num_tx_queues; i++) {
John Fastabend4ef6acf2010-07-01 13:21:35 +0000376 qdisc = netdev_get_tx_queue(dev, i)->qdisc;
377 if (qdisc) {
378 spin_lock_bh(qdisc_lock(qdisc));
379 qdisc_reset(qdisc);
380 spin_unlock_bh(qdisc_lock(qdisc));
381 }
382 }
David S. Miller5aa70992008-07-08 22:59:10 -0700383}
384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385static inline void qdisc_reset_all_tx(struct net_device *dev)
Thomas Graf9972b252005-06-18 22:57:26 -0700386{
John Fastabendf0796d52010-07-01 13:21:57 +0000387 qdisc_reset_all_tx_gt(dev, 0);
Thomas Graf9972b252005-06-18 22:57:26 -0700388}
389
David S. Miller3e745dd2008-07-08 23:00:25 -0700390/* Are all TX queues of the device empty? */
391static inline bool qdisc_all_tx_empty(const struct net_device *dev)
392{
David S. Millere8a04642008-07-17 00:34:19 -0700393 unsigned int i;
394 for (i = 0; i < dev->num_tx_queues; i++) {
395 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
396 const struct Qdisc *q = txq->qdisc;
David S. Miller3e745dd2008-07-08 23:00:25 -0700397
David S. Millere8a04642008-07-17 00:34:19 -0700398 if (q->q.qlen)
399 return false;
400 }
401 return true;
David S. Miller3e745dd2008-07-08 23:00:25 -0700402}
403
David S. Miller6fa98642008-07-08 23:01:06 -0700404/* Are any of the TX qdiscs changing? */
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400405static inline bool qdisc_tx_changing(const struct net_device *dev)
David S. Miller6fa98642008-07-08 23:01:06 -0700406{
David S. Millere8a04642008-07-17 00:34:19 -0700407 unsigned int i;
408 for (i = 0; i < dev->num_tx_queues; i++) {
409 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
410 if (txq->qdisc != txq->qdisc_sleeping)
411 return true;
412 }
413 return false;
David S. Miller6fa98642008-07-08 23:01:06 -0700414}
415
David S. Millere8a04642008-07-17 00:34:19 -0700416/* Is the device using the noop qdisc on all queues? */
David S. Miller05297942008-07-08 23:01:27 -0700417static inline bool qdisc_tx_is_noop(const struct net_device *dev)
418{
David S. Millere8a04642008-07-17 00:34:19 -0700419 unsigned int i;
420 for (i = 0; i < dev->num_tx_queues; i++) {
421 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
422 if (txq->qdisc != &noop_qdisc)
423 return false;
424 }
425 return true;
David S. Miller05297942008-07-08 23:01:27 -0700426}
427
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000428static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700429{
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700430 return qdisc_skb_cb(skb)->pkt_len;
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700431}
432
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700433/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700434enum net_xmit_qdisc_t {
435 __NET_XMIT_STOLEN = 0x00010000,
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700436 __NET_XMIT_BYPASS = 0x00020000,
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700437};
438
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700439#ifdef CONFIG_NET_CLS_ACT
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700440#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700441#else
442#define net_xmit_drop_count(e) (1)
443#endif
444
Eric Dumazeta2da5702011-01-20 03:48:19 +0000445static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
446 const struct Qdisc *sch)
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700447{
David S. Miller3a682fb2008-07-20 18:13:01 -0700448#ifdef CONFIG_NET_SCHED
Eric Dumazeta2da5702011-01-20 03:48:19 +0000449 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
450
451 if (stab)
452 __qdisc_calculate_pkt_len(skb, stab);
David S. Miller3a682fb2008-07-20 18:13:01 -0700453#endif
Eric Dumazeta2da5702011-01-20 03:48:19 +0000454}
455
456static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
457{
458 qdisc_calculate_pkt_len(skb, sch);
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700459 return sch->enqueue(skb, sch);
460}
461
462static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
463{
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700464 qdisc_skb_cb(skb)->pkt_len = skb->len;
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700465 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700466}
467
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000468
469static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
470 const struct sk_buff *skb)
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +0000471{
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000472 bstats->bytes += qdisc_pkt_len(skb);
473 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
474}
475
476static inline void qdisc_bstats_update(struct Qdisc *sch,
477 const struct sk_buff *skb)
478{
479 bstats_update(&sch->bstats, skb);
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +0000480}
481
Thomas Graf9972b252005-06-18 22:57:26 -0700482static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
483 struct sk_buff_head *list)
484{
485 __skb_queue_tail(list, skb);
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700486 sch->qstats.backlog += qdisc_pkt_len(skb);
Thomas Graf9972b252005-06-18 22:57:26 -0700487
488 return NET_XMIT_SUCCESS;
489}
490
491static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
492{
493 return __qdisc_enqueue_tail(skb, sch, &sch->q);
494}
495
496static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
497 struct sk_buff_head *list)
498{
499 struct sk_buff *skb = __skb_dequeue(list);
500
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800501 if (likely(skb != NULL)) {
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700502 sch->qstats.backlog -= qdisc_pkt_len(skb);
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800503 qdisc_bstats_update(sch, skb);
504 }
Thomas Graf9972b252005-06-18 22:57:26 -0700505
506 return skb;
507}
508
509static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
510{
511 return __qdisc_dequeue_head(sch, &sch->q);
512}
513
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000514static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
515 struct sk_buff_head *list)
516{
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800517 struct sk_buff *skb = __skb_dequeue(list);
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000518
519 if (likely(skb != NULL)) {
520 unsigned int len = qdisc_pkt_len(skb);
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800521 sch->qstats.backlog -= len;
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000522 kfree_skb(skb);
523 return len;
524 }
525
526 return 0;
527}
528
529static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
530{
531 return __qdisc_queue_drop_head(sch, &sch->q);
532}
533
Thomas Graf9972b252005-06-18 22:57:26 -0700534static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
535 struct sk_buff_head *list)
536{
537 struct sk_buff *skb = __skb_dequeue_tail(list);
538
539 if (likely(skb != NULL))
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700540 sch->qstats.backlog -= qdisc_pkt_len(skb);
Thomas Graf9972b252005-06-18 22:57:26 -0700541
542 return skb;
543}
544
545static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
546{
547 return __qdisc_dequeue_tail(sch, &sch->q);
548}
549
Patrick McHardy48a8f512008-10-31 00:44:18 -0700550static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
551{
552 return skb_peek(&sch->q);
553}
554
Jarek Poplawski77be1552008-10-31 00:47:01 -0700555/* generic pseudo peek method for non-work-conserving qdisc */
556static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
557{
558 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800559 if (!sch->gso_skb) {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700560 sch->gso_skb = sch->dequeue(sch);
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800561 if (sch->gso_skb)
562 /* it's still part of the queue */
563 sch->q.qlen++;
564 }
Jarek Poplawski77be1552008-10-31 00:47:01 -0700565
566 return sch->gso_skb;
567}
568
569/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
570static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
571{
572 struct sk_buff *skb = sch->gso_skb;
573
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800574 if (skb) {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700575 sch->gso_skb = NULL;
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800576 sch->q.qlen--;
577 } else {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700578 skb = sch->dequeue(sch);
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800579 }
Jarek Poplawski77be1552008-10-31 00:47:01 -0700580
581 return skb;
582}
583
Thomas Graf9972b252005-06-18 22:57:26 -0700584static inline void __qdisc_reset_queue(struct Qdisc *sch,
585 struct sk_buff_head *list)
586{
587 /*
588 * We do not know the backlog in bytes of this list, it
589 * is up to the caller to correct it
590 */
David S. Miller93245dd2008-07-17 04:03:43 -0700591 __skb_queue_purge(list);
Thomas Graf9972b252005-06-18 22:57:26 -0700592}
593
594static inline void qdisc_reset_queue(struct Qdisc *sch)
595{
596 __qdisc_reset_queue(sch, &sch->q);
597 sch->qstats.backlog = 0;
598}
599
600static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
601 struct sk_buff_head *list)
602{
603 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
604
605 if (likely(skb != NULL)) {
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700606 unsigned int len = qdisc_pkt_len(skb);
Thomas Graf9972b252005-06-18 22:57:26 -0700607 kfree_skb(skb);
608 return len;
609 }
610
611 return 0;
612}
613
614static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
615{
616 return __qdisc_queue_drop(sch, &sch->q);
617}
618
619static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
620{
621 kfree_skb(skb);
622 sch->qstats.drops++;
623
624 return NET_XMIT_DROP;
625}
626
627static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
628{
629 sch->qstats.drops++;
630
Patrick McHardyc3bc7cf2007-07-15 00:03:05 -0700631#ifdef CONFIG_NET_CLS_ACT
Thomas Graf9972b252005-06-18 22:57:26 -0700632 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
633 goto drop;
634
635 return NET_XMIT_SUCCESS;
636
637drop:
638#endif
639 kfree_skb(skb);
640 return NET_XMIT_DROP;
641}
642
Jesper Dangaard Brouere9bef552007-09-12 16:35:24 +0200643/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
644 long it will take to send a packet given its size.
645 */
646static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
647{
Jesper Dangaard Brouere08b0992007-09-12 16:36:28 +0200648 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
649 if (slot < 0)
650 slot = 0;
Jesper Dangaard Brouere9bef552007-09-12 16:35:24 +0200651 slot >>= rtab->rate.cell_log;
652 if (slot > 255)
Eric Dumazeta02cec22010-09-22 20:43:57 +0000653 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
Jesper Dangaard Brouere9bef552007-09-12 16:35:24 +0200654 return rtab->data[slot];
655}
656
Jamal Hadi Salim12da81d2007-10-26 02:47:23 -0700657#ifdef CONFIG_NET_CLS_ACT
Changli Gao210d6de2010-06-24 16:25:12 +0000658static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
659 int action)
Jamal Hadi Salim12da81d2007-10-26 02:47:23 -0700660{
Changli Gao210d6de2010-06-24 16:25:12 +0000661 struct sk_buff *n;
662
Changli Gao17302102010-12-20 04:35:30 +0000663 n = skb_clone(skb, gfp_mask);
Jamal Hadi Salim12da81d2007-10-26 02:47:23 -0700664
665 if (n) {
666 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
667 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
668 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
Jamal Hadi Salim12da81d2007-10-26 02:47:23 -0700669 }
670 return n;
671}
672#endif
673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674#endif