blob: 624f9857c83e3d7f2987ef95ecc410ad6f8c744f [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
Eric Dumazet1abbe132012-12-11 15:54:33 +000053#define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
54 * q->dev_queue : It can test
55 * netif_xmit_frozen_or_stopped() before
56 * dequeueing next packet.
57 * Its true for MQ/MQPRIO slaves, or non
58 * multiqueue device.
59 */
Jarek Poplawskib00355d2009-02-01 01:12:42 -080060#define TCQ_F_WARN_NONWC (1 << 16)
Eric Dumazet45203a32013-06-06 08:43:22 -070061 u32 limit;
Eric Dumazet05bdd2f2011-10-20 17:45:43 -040062 const struct Qdisc_ops *ops;
Eric Dumazeta2da5702011-01-20 03:48:19 +000063 struct qdisc_size_table __rcu *stab;
Eric Dumazet5e140df2009-03-20 01:33:32 -070064 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 u32 handle;
66 u32 parent;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 int (*reshape_fail)(struct sk_buff *skb,
68 struct Qdisc *q);
69
David S. Miller72b25a92008-07-18 20:54:17 -070070 void *u32_node;
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 /* This field is deprecated, but it is still used by CBQ
73 * and it will live until better solution will be invented.
74 */
75 struct Qdisc *__parent;
Eric Dumazet5e140df2009-03-20 01:33:32 -070076 struct netdev_queue *dev_queue;
Eric Dumazet5e140df2009-03-20 01:33:32 -070077
Eric Dumazet45203a32013-06-06 08:43:22 -070078 struct gnet_stats_rate_est64 rate_est;
79 struct Qdisc *next_sched;
Eric Dumazet5e140df2009-03-20 01:33:32 -070080 struct sk_buff *gso_skb;
81 /*
82 * For performance sake on SMP, we put highly modified fields at the end
83 */
84 unsigned long state;
85 struct sk_buff_head q;
Eric Dumazetc1a8f1f2009-08-16 09:36:49 +000086 struct gnet_stats_basic_packed bstats;
Eric Dumazetfd245a42011-01-20 05:27:16 +000087 unsigned int __state;
Eric Dumazet5e140df2009-03-20 01:33:32 -070088 struct gnet_stats_queue qstats;
Eric Dumazet79640a42010-06-02 05:09:29 -070089 struct rcu_head rcu_head;
Eric Dumazet45203a32013-06-06 08:43:22 -070090 int padded;
91 atomic_t refcnt;
92
93 spinlock_t busylock ____cacheline_aligned_in_smp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094};
95
Eric Dumazetfd245a42011-01-20 05:27:16 +000096static inline bool qdisc_is_running(const struct Qdisc *qdisc)
Eric Dumazetbc135b22010-06-02 03:23:51 -070097{
Eric Dumazetfd245a42011-01-20 05:27:16 +000098 return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
Eric Dumazetbc135b22010-06-02 03:23:51 -070099}
100
101static inline bool qdisc_run_begin(struct Qdisc *qdisc)
102{
Eric Dumazetfd245a42011-01-20 05:27:16 +0000103 if (qdisc_is_running(qdisc))
104 return false;
105 qdisc->__state |= __QDISC___STATE_RUNNING;
106 return true;
Eric Dumazetbc135b22010-06-02 03:23:51 -0700107}
108
109static inline void qdisc_run_end(struct Qdisc *qdisc)
110{
Eric Dumazetfd245a42011-01-20 05:27:16 +0000111 qdisc->__state &= ~__QDISC___STATE_RUNNING;
112}
113
114static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
115{
Eric Dumazetef352e72011-03-24 00:13:14 -0700116 return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
Eric Dumazetfd245a42011-01-20 05:27:16 +0000117}
118
119static inline void qdisc_throttled(struct Qdisc *qdisc)
120{
Eric Dumazetef352e72011-03-24 00:13:14 -0700121 set_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
Eric Dumazetfd245a42011-01-20 05:27:16 +0000122}
123
124static inline void qdisc_unthrottled(struct Qdisc *qdisc)
125{
Eric Dumazetef352e72011-03-24 00:13:14 -0700126 clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
Eric Dumazetbc135b22010-06-02 03:23:51 -0700127}
128
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000129struct Qdisc_class_ops {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 /* Child qdisc manipulation */
Jarek Poplawski926e61b2009-09-15 02:53:07 -0700131 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 int (*graft)(struct Qdisc *, unsigned long cl,
133 struct Qdisc *, struct Qdisc **);
134 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
Patrick McHardy43effa12006-11-29 17:35:48 -0800135 void (*qlen_notify)(struct Qdisc *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137 /* Class manipulation routines */
138 unsigned long (*get)(struct Qdisc *, u32 classid);
139 void (*put)(struct Qdisc *, unsigned long);
140 int (*change)(struct Qdisc *, u32, u32,
Patrick McHardy1e904742008-01-22 22:11:17 -0800141 struct nlattr **, unsigned long *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 int (*delete)(struct Qdisc *, unsigned long);
143 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
144
145 /* Filter manipulation */
146 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
147 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
148 u32 classid);
149 void (*unbind_tcf)(struct Qdisc *, unsigned long);
150
151 /* rtnetlink specific */
152 int (*dump)(struct Qdisc *, unsigned long,
153 struct sk_buff *skb, struct tcmsg*);
154 int (*dump_stats)(struct Qdisc *, unsigned long,
155 struct gnet_dump *);
156};
157
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000158struct Qdisc_ops {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 struct Qdisc_ops *next;
Eric Dumazet20fea082007-11-14 01:44:41 -0800160 const struct Qdisc_class_ops *cl_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 char id[IFNAMSIZ];
162 int priv_size;
163
164 int (*enqueue)(struct sk_buff *, struct Qdisc *);
165 struct sk_buff * (*dequeue)(struct Qdisc *);
Jarek Poplawski90d841fd2008-10-31 00:43:45 -0700166 struct sk_buff * (*peek)(struct Qdisc *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 unsigned int (*drop)(struct Qdisc *);
168
Patrick McHardy1e904742008-01-22 22:11:17 -0800169 int (*init)(struct Qdisc *, struct nlattr *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 void (*reset)(struct Qdisc *);
171 void (*destroy)(struct Qdisc *);
Patrick McHardy1e904742008-01-22 22:11:17 -0800172 int (*change)(struct Qdisc *, struct nlattr *arg);
David S. Miller6ec1c692009-09-06 01:58:51 -0700173 void (*attach)(struct Qdisc *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
175 int (*dump)(struct Qdisc *, struct sk_buff *);
176 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
177
178 struct module *owner;
179};
180
181
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000182struct tcf_result {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 unsigned long class;
184 u32 classid;
185};
186
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000187struct tcf_proto_ops {
WANG Cong36272872013-12-15 20:15:11 -0800188 struct list_head head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 char kind[IFNAMSIZ];
190
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000191 int (*classify)(struct sk_buff *,
192 const struct tcf_proto *,
193 struct tcf_result *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 int (*init)(struct tcf_proto*);
195 void (*destroy)(struct tcf_proto*);
196
197 unsigned long (*get)(struct tcf_proto*, u32 handle);
198 void (*put)(struct tcf_proto*, unsigned long);
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000199 int (*change)(struct net *net, struct sk_buff *,
Eric W. Biedermanaf4c6642012-05-25 13:42:45 -0600200 struct tcf_proto*, unsigned long,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800201 u32 handle, struct nlattr **,
Cong Wang2f7ef2f2014-04-25 13:54:06 -0700202 unsigned long *, bool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 int (*delete)(struct tcf_proto*, unsigned long);
204 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
205
206 /* rtnetlink specific */
WANG Cong832d1d52014-01-09 16:14:01 -0800207 int (*dump)(struct net*, struct tcf_proto*, unsigned long,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 struct sk_buff *skb, struct tcmsg*);
209
210 struct module *owner;
211};
212
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000213struct tcf_proto {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 /* Fast access part */
215 struct tcf_proto *next;
216 void *root;
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000217 int (*classify)(struct sk_buff *,
218 const struct tcf_proto *,
219 struct tcf_result *);
Al Viro66c6f522006-11-20 18:07:51 -0800220 __be16 protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
222 /* All the rest */
223 u32 prio;
224 u32 classid;
225 struct Qdisc *q;
226 void *data;
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000227 const struct tcf_proto_ops *ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228};
229
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700230struct qdisc_skb_cb {
231 unsigned int pkt_len;
Jiri Pirkodf4ab5b2012-07-20 02:28:49 +0000232 u16 slave_dev_queue_mapping;
Eric Dumazet5ee31c682012-06-12 06:03:51 +0000233 u16 _pad;
234 unsigned char data[20];
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700235};
236
David S. Miller16bda132012-02-06 15:14:37 -0500237static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
238{
239 struct qdisc_skb_cb *qcb;
Eric Dumazet5ee31c682012-06-12 06:03:51 +0000240
241 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
David S. Miller16bda132012-02-06 15:14:37 -0500242 BUILD_BUG_ON(sizeof(qcb->data) < sz);
243}
244
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400245static inline int qdisc_qlen(const struct Qdisc *q)
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +0000246{
247 return q->q.qlen;
248}
249
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000250static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700251{
252 return (struct qdisc_skb_cb *)skb->cb;
253}
254
David S. Miller83874002008-07-17 00:53:03 -0700255static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
256{
257 return &qdisc->q.lock;
258}
259
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400260static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
David S. Miller7698b4f2008-07-16 01:42:40 -0700261{
262 return qdisc->dev_queue->qdisc;
263}
264
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400265static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
Jarek Poplawski2540e052008-08-21 05:11:14 -0700266{
267 return qdisc->dev_queue->qdisc_sleeping;
268}
269
David S. Miller7e43f112008-08-02 23:27:37 -0700270/* The qdisc root lock is a mechanism by which to top level
271 * of a qdisc tree can be locked from any qdisc node in the
272 * forest. This allows changing the configuration of some
273 * aspect of the qdisc tree while blocking out asynchronous
274 * qdisc access in the packet processing paths.
275 *
276 * It is only legal to do this when the root will not change
277 * on us. Otherwise we'll potentially lock the wrong qdisc
278 * root. This is enforced by holding the RTNL semaphore, which
279 * all users of this lock accessor must do.
280 */
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400281static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
David S. Miller7698b4f2008-07-16 01:42:40 -0700282{
283 struct Qdisc *root = qdisc_root(qdisc);
284
David S. Miller7e43f112008-08-02 23:27:37 -0700285 ASSERT_RTNL();
David S. Miller83874002008-07-17 00:53:03 -0700286 return qdisc_lock(root);
David S. Miller7698b4f2008-07-16 01:42:40 -0700287}
288
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400289static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700290{
291 struct Qdisc *root = qdisc_root_sleeping(qdisc);
292
293 ASSERT_RTNL();
294 return qdisc_lock(root);
295}
296
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400297static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
David S. Miller5ce2d482008-07-08 17:06:30 -0700298{
299 return qdisc->dev_queue->dev;
300}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400302static inline void sch_tree_lock(const struct Qdisc *q)
David S. Miller78a5b302008-07-16 03:12:24 -0700303{
Jarek Poplawskife439dd2008-08-27 02:27:10 -0700304 spin_lock_bh(qdisc_root_sleeping_lock(q));
David S. Miller78a5b302008-07-16 03:12:24 -0700305}
306
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400307static inline void sch_tree_unlock(const struct Qdisc *q)
David S. Miller78a5b302008-07-16 03:12:24 -0700308{
Jarek Poplawskife439dd2008-08-27 02:27:10 -0700309 spin_unlock_bh(qdisc_root_sleeping_lock(q));
David S. Miller78a5b302008-07-16 03:12:24 -0700310}
311
312#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
313#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Thomas Grafe41a33e2005-07-05 14:14:30 -0700315extern struct Qdisc noop_qdisc;
316extern struct Qdisc_ops noop_qdisc_ops;
David S. Miller6ec1c692009-09-06 01:58:51 -0700317extern struct Qdisc_ops pfifo_fast_ops;
318extern struct Qdisc_ops mq_qdisc_ops;
stephen hemminger6da7c8f2013-08-27 16:19:08 -0700319extern const struct Qdisc_ops *default_qdisc_ops;
Thomas Grafe41a33e2005-07-05 14:14:30 -0700320
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000321struct Qdisc_class_common {
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700322 u32 classid;
323 struct hlist_node hnode;
324};
325
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000326struct Qdisc_class_hash {
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700327 struct hlist_head *hash;
328 unsigned int hashsize;
329 unsigned int hashmask;
330 unsigned int hashelems;
331};
332
333static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
334{
335 id ^= id >> 8;
336 id ^= id >> 4;
337 return id & mask;
338}
339
340static inline struct Qdisc_class_common *
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400341qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700342{
343 struct Qdisc_class_common *cl;
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700344 unsigned int h;
345
346 h = qdisc_class_hash(id, hash->hashmask);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800347 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700348 if (cl->classid == id)
349 return cl;
350 }
351 return NULL;
352}
353
Joe Perches5c152572013-07-30 22:47:13 -0700354int qdisc_class_hash_init(struct Qdisc_class_hash *);
355void qdisc_class_hash_insert(struct Qdisc_class_hash *,
356 struct Qdisc_class_common *);
357void qdisc_class_hash_remove(struct Qdisc_class_hash *,
358 struct Qdisc_class_common *);
359void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
360void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700361
Joe Perches5c152572013-07-30 22:47:13 -0700362void dev_init_scheduler(struct net_device *dev);
363void dev_shutdown(struct net_device *dev);
364void dev_activate(struct net_device *dev);
365void dev_deactivate(struct net_device *dev);
366void dev_deactivate_many(struct list_head *head);
367struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
368 struct Qdisc *qdisc);
369void qdisc_reset(struct Qdisc *qdisc);
370void qdisc_destroy(struct Qdisc *qdisc);
371void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
372struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
stephen hemmingerd2a7f262013-08-31 10:15:50 -0700373 const struct Qdisc_ops *ops);
Joe Perches5c152572013-07-30 22:47:13 -0700374struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
stephen hemmingerd2a7f262013-08-31 10:15:50 -0700375 const struct Qdisc_ops *ops, u32 parentid);
Joe Perches5c152572013-07-30 22:47:13 -0700376void __qdisc_calculate_pkt_len(struct sk_buff *skb,
377 const struct qdisc_size_table *stab);
378void tcf_destroy(struct tcf_proto *tp);
379void tcf_destroy_chain(struct tcf_proto **fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
John Fastabendf0796d52010-07-01 13:21:57 +0000381/* Reset all TX qdiscs greater then index of a device. */
382static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
David S. Miller5aa70992008-07-08 22:59:10 -0700383{
John Fastabend4ef6acf2010-07-01 13:21:35 +0000384 struct Qdisc *qdisc;
385
John Fastabendf0796d52010-07-01 13:21:57 +0000386 for (; i < dev->num_tx_queues; i++) {
John Fastabend4ef6acf2010-07-01 13:21:35 +0000387 qdisc = netdev_get_tx_queue(dev, i)->qdisc;
388 if (qdisc) {
389 spin_lock_bh(qdisc_lock(qdisc));
390 qdisc_reset(qdisc);
391 spin_unlock_bh(qdisc_lock(qdisc));
392 }
393 }
David S. Miller5aa70992008-07-08 22:59:10 -0700394}
395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396static inline void qdisc_reset_all_tx(struct net_device *dev)
Thomas Graf9972b252005-06-18 22:57:26 -0700397{
John Fastabendf0796d52010-07-01 13:21:57 +0000398 qdisc_reset_all_tx_gt(dev, 0);
Thomas Graf9972b252005-06-18 22:57:26 -0700399}
400
David S. Miller3e745dd2008-07-08 23:00:25 -0700401/* Are all TX queues of the device empty? */
402static inline bool qdisc_all_tx_empty(const struct net_device *dev)
403{
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 const struct Qdisc *q = txq->qdisc;
David S. Miller3e745dd2008-07-08 23:00:25 -0700408
David S. Millere8a04642008-07-17 00:34:19 -0700409 if (q->q.qlen)
410 return false;
411 }
412 return true;
David S. Miller3e745dd2008-07-08 23:00:25 -0700413}
414
David S. Miller6fa98642008-07-08 23:01:06 -0700415/* Are any of the TX qdiscs changing? */
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400416static inline bool qdisc_tx_changing(const struct net_device *dev)
David S. Miller6fa98642008-07-08 23:01:06 -0700417{
David S. Millere8a04642008-07-17 00:34:19 -0700418 unsigned int i;
419 for (i = 0; i < dev->num_tx_queues; i++) {
420 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
421 if (txq->qdisc != txq->qdisc_sleeping)
422 return true;
423 }
424 return false;
David S. Miller6fa98642008-07-08 23:01:06 -0700425}
426
David S. Millere8a04642008-07-17 00:34:19 -0700427/* Is the device using the noop qdisc on all queues? */
David S. Miller05297942008-07-08 23:01:27 -0700428static inline bool qdisc_tx_is_noop(const struct net_device *dev)
429{
David S. Millere8a04642008-07-17 00:34:19 -0700430 unsigned int i;
431 for (i = 0; i < dev->num_tx_queues; i++) {
432 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
433 if (txq->qdisc != &noop_qdisc)
434 return false;
435 }
436 return true;
David S. Miller05297942008-07-08 23:01:27 -0700437}
438
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000439static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700440{
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700441 return qdisc_skb_cb(skb)->pkt_len;
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700442}
443
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700444/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700445enum net_xmit_qdisc_t {
446 __NET_XMIT_STOLEN = 0x00010000,
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700447 __NET_XMIT_BYPASS = 0x00020000,
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700448};
449
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700450#ifdef CONFIG_NET_CLS_ACT
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700451#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700452#else
453#define net_xmit_drop_count(e) (1)
454#endif
455
Eric Dumazeta2da5702011-01-20 03:48:19 +0000456static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
457 const struct Qdisc *sch)
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700458{
David S. Miller3a682fb2008-07-20 18:13:01 -0700459#ifdef CONFIG_NET_SCHED
Eric Dumazeta2da5702011-01-20 03:48:19 +0000460 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
461
462 if (stab)
463 __qdisc_calculate_pkt_len(skb, stab);
David S. Miller3a682fb2008-07-20 18:13:01 -0700464#endif
Eric Dumazeta2da5702011-01-20 03:48:19 +0000465}
466
467static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
468{
469 qdisc_calculate_pkt_len(skb, sch);
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700470 return sch->enqueue(skb, sch);
471}
472
473static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
474{
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700475 qdisc_skb_cb(skb)->pkt_len = skb->len;
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700476 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700477}
478
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000479
480static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
481 const struct sk_buff *skb)
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +0000482{
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000483 bstats->bytes += qdisc_pkt_len(skb);
484 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
485}
486
487static inline void qdisc_bstats_update(struct Qdisc *sch,
488 const struct sk_buff *skb)
489{
490 bstats_update(&sch->bstats, skb);
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +0000491}
492
Thomas Graf9972b252005-06-18 22:57:26 -0700493static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
494 struct sk_buff_head *list)
495{
496 __skb_queue_tail(list, skb);
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700497 sch->qstats.backlog += qdisc_pkt_len(skb);
Thomas Graf9972b252005-06-18 22:57:26 -0700498
499 return NET_XMIT_SUCCESS;
500}
501
502static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
503{
504 return __qdisc_enqueue_tail(skb, sch, &sch->q);
505}
506
507static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
508 struct sk_buff_head *list)
509{
510 struct sk_buff *skb = __skb_dequeue(list);
511
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800512 if (likely(skb != NULL)) {
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700513 sch->qstats.backlog -= qdisc_pkt_len(skb);
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800514 qdisc_bstats_update(sch, skb);
515 }
Thomas Graf9972b252005-06-18 22:57:26 -0700516
517 return skb;
518}
519
520static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
521{
522 return __qdisc_dequeue_head(sch, &sch->q);
523}
524
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000525static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
526 struct sk_buff_head *list)
527{
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800528 struct sk_buff *skb = __skb_dequeue(list);
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000529
530 if (likely(skb != NULL)) {
531 unsigned int len = qdisc_pkt_len(skb);
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800532 sch->qstats.backlog -= len;
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000533 kfree_skb(skb);
534 return len;
535 }
536
537 return 0;
538}
539
540static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
541{
542 return __qdisc_queue_drop_head(sch, &sch->q);
543}
544
Thomas Graf9972b252005-06-18 22:57:26 -0700545static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
546 struct sk_buff_head *list)
547{
548 struct sk_buff *skb = __skb_dequeue_tail(list);
549
550 if (likely(skb != NULL))
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700551 sch->qstats.backlog -= qdisc_pkt_len(skb);
Thomas Graf9972b252005-06-18 22:57:26 -0700552
553 return skb;
554}
555
556static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
557{
558 return __qdisc_dequeue_tail(sch, &sch->q);
559}
560
Patrick McHardy48a8f512008-10-31 00:44:18 -0700561static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
562{
563 return skb_peek(&sch->q);
564}
565
Jarek Poplawski77be1552008-10-31 00:47:01 -0700566/* generic pseudo peek method for non-work-conserving qdisc */
567static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
568{
569 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800570 if (!sch->gso_skb) {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700571 sch->gso_skb = sch->dequeue(sch);
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800572 if (sch->gso_skb)
573 /* it's still part of the queue */
574 sch->q.qlen++;
575 }
Jarek Poplawski77be1552008-10-31 00:47:01 -0700576
577 return sch->gso_skb;
578}
579
580/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
581static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
582{
583 struct sk_buff *skb = sch->gso_skb;
584
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800585 if (skb) {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700586 sch->gso_skb = NULL;
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800587 sch->q.qlen--;
588 } else {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700589 skb = sch->dequeue(sch);
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800590 }
Jarek Poplawski77be1552008-10-31 00:47:01 -0700591
592 return skb;
593}
594
Thomas Graf9972b252005-06-18 22:57:26 -0700595static inline void __qdisc_reset_queue(struct Qdisc *sch,
596 struct sk_buff_head *list)
597{
598 /*
599 * We do not know the backlog in bytes of this list, it
600 * is up to the caller to correct it
601 */
David S. Miller93245dd2008-07-17 04:03:43 -0700602 __skb_queue_purge(list);
Thomas Graf9972b252005-06-18 22:57:26 -0700603}
604
605static inline void qdisc_reset_queue(struct Qdisc *sch)
606{
607 __qdisc_reset_queue(sch, &sch->q);
608 sch->qstats.backlog = 0;
609}
610
611static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
612 struct sk_buff_head *list)
613{
614 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
615
616 if (likely(skb != NULL)) {
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700617 unsigned int len = qdisc_pkt_len(skb);
Thomas Graf9972b252005-06-18 22:57:26 -0700618 kfree_skb(skb);
619 return len;
620 }
621
622 return 0;
623}
624
625static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
626{
627 return __qdisc_queue_drop(sch, &sch->q);
628}
629
630static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
631{
632 kfree_skb(skb);
633 sch->qstats.drops++;
634
635 return NET_XMIT_DROP;
636}
637
638static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
639{
640 sch->qstats.drops++;
641
Patrick McHardyc3bc7cf2007-07-15 00:03:05 -0700642#ifdef CONFIG_NET_CLS_ACT
Thomas Graf9972b252005-06-18 22:57:26 -0700643 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
644 goto drop;
645
646 return NET_XMIT_SUCCESS;
647
648drop:
649#endif
650 kfree_skb(skb);
651 return NET_XMIT_DROP;
652}
653
Jesper Dangaard Brouere9bef552007-09-12 16:35:24 +0200654/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
655 long it will take to send a packet given its size.
656 */
657static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
658{
Jesper Dangaard Brouere08b0992007-09-12 16:36:28 +0200659 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
660 if (slot < 0)
661 slot = 0;
Jesper Dangaard Brouere9bef552007-09-12 16:35:24 +0200662 slot >>= rtab->rate.cell_log;
663 if (slot > 255)
Eric Dumazeta02cec22010-09-22 20:43:57 +0000664 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
Jesper Dangaard Brouere9bef552007-09-12 16:35:24 +0200665 return rtab->data[slot];
666}
667
Jamal Hadi Salim12da81d2007-10-26 02:47:23 -0700668#ifdef CONFIG_NET_CLS_ACT
Changli Gao210d6de2010-06-24 16:25:12 +0000669static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
670 int action)
Jamal Hadi Salim12da81d2007-10-26 02:47:23 -0700671{
Changli Gao210d6de2010-06-24 16:25:12 +0000672 struct sk_buff *n;
673
Changli Gao17302102010-12-20 04:35:30 +0000674 n = skb_clone(skb, gfp_mask);
Jamal Hadi Salim12da81d2007-10-26 02:47:23 -0700675
676 if (n) {
677 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
678 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
679 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
Jamal Hadi Salim12da81d2007-10-26 02:47:23 -0700680 }
681 return n;
682}
683#endif
684
Jiri Pirko292f1c72013-02-12 00:12:03 +0000685struct psched_ratecfg {
Eric Dumazet130d3d62013-06-06 13:56:19 -0700686 u64 rate_bytes_ps; /* bytes per second */
Eric Dumazet01cb71d2013-06-02 13:55:05 +0000687 u32 mult;
688 u16 overhead;
Jesper Dangaard Brouer8a8e3d82013-08-14 23:47:11 +0200689 u8 linklayer;
Eric Dumazet01cb71d2013-06-02 13:55:05 +0000690 u8 shift;
Jiri Pirko292f1c72013-02-12 00:12:03 +0000691};
692
693static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
694 unsigned int len)
695{
Jesper Dangaard Brouer8a8e3d82013-08-14 23:47:11 +0200696 len += r->overhead;
697
698 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
699 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
700
701 return ((u64)len * r->mult) >> r->shift;
Jiri Pirko292f1c72013-02-12 00:12:03 +0000702}
703
Joe Perches5c152572013-07-30 22:47:13 -0700704void psched_ratecfg_precompute(struct psched_ratecfg *r,
Eric Dumazet3e1e3aa2013-09-19 09:10:03 -0700705 const struct tc_ratespec *conf,
706 u64 rate64);
Jiri Pirko292f1c72013-02-12 00:12:03 +0000707
Eric Dumazet01cb71d2013-06-02 13:55:05 +0000708static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
709 const struct psched_ratecfg *r)
Jiri Pirko292f1c72013-02-12 00:12:03 +0000710{
Eric Dumazet01cb71d2013-06-02 13:55:05 +0000711 memset(res, 0, sizeof(*res));
Eric Dumazet3e1e3aa2013-09-19 09:10:03 -0700712
713 /* legacy struct tc_ratespec has a 32bit @rate field
714 * Qdisc using 64bit rate should add new attributes
715 * in order to maintain compatibility.
716 */
717 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
718
Eric Dumazet01cb71d2013-06-02 13:55:05 +0000719 res->overhead = r->overhead;
Jesper Dangaard Brouer8a8e3d82013-08-14 23:47:11 +0200720 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
Jiri Pirko292f1c72013-02-12 00:12:03 +0000721}
722
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723#endif