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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>
John Fastabend22e0f8b2014-09-28 11:52:56 -07009#include <linux/percpu.h>
Jesper Dangaard Brouer5772e9a2014-10-01 22:35:59 +020010#include <linux/dynamic_queue_limits.h>
Jiri Pirko5bc17012017-05-17 11:08:01 +020011#include <linux/list.h>
Reshetova, Elena7b936402017-07-04 15:53:07 +030012#include <linux/refcount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <net/gen_stats.h>
Thomas Grafbe577dd2007-03-22 11:55:50 -070014#include <net/rtnetlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
16struct Qdisc_ops;
17struct qdisc_walker;
18struct tcf_walker;
19struct module;
20
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000021struct qdisc_rate_table {
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 struct tc_ratespec rate;
23 u32 data[256];
24 struct qdisc_rate_table *next;
25 int refcnt;
26};
27
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000028enum qdisc_state_t {
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 {
Eric Dumazeta2da5702011-01-20 03:48:19 +000034 struct rcu_head rcu;
Jussi Kivilinna175f9c12008-07-20 00:08:47 -070035 struct list_head list;
36 struct tc_sizespec szopts;
37 int refcnt;
38 u16 data[];
39};
40
Florian Westphal48da34b2016-09-18 00:57:34 +020041/* similar to sk_buff_head, but skb->prev pointer is undefined. */
42struct qdisc_skb_head {
43 struct sk_buff *head;
44 struct sk_buff *tail;
45 __u32 qlen;
46 spinlock_t lock;
47};
48
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000049struct Qdisc {
Eric Dumazet520ac302016-06-21 23:16:49 -070050 int (*enqueue)(struct sk_buff *skb,
51 struct Qdisc *sch,
52 struct sk_buff **to_free);
53 struct sk_buff * (*dequeue)(struct Qdisc *sch);
Eric Dumazet05bdd2f2011-10-20 17:45:43 -040054 unsigned int flags;
Jarek Poplawskib00355d2009-02-01 01:12:42 -080055#define TCQ_F_BUILTIN 1
Eric Dumazetfd245a42011-01-20 05:27:16 +000056#define TCQ_F_INGRESS 2
57#define TCQ_F_CAN_BYPASS 4
58#define TCQ_F_MQROOT 8
Eric Dumazet1abbe132012-12-11 15:54:33 +000059#define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
60 * q->dev_queue : It can test
61 * netif_xmit_frozen_or_stopped() before
62 * dequeueing next packet.
63 * Its true for MQ/MQPRIO slaves, or non
64 * multiqueue device.
65 */
Jarek Poplawskib00355d2009-02-01 01:12:42 -080066#define TCQ_F_WARN_NONWC (1 << 16)
John Fastabend22e0f8b2014-09-28 11:52:56 -070067#define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
Eric Dumazet4eaf3b82015-12-01 20:08:51 -080068#define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
69 * qdisc_tree_decrease_qlen() should stop.
70 */
Jiri Kosina49b49972017-03-08 16:03:32 +010071#define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
Eric Dumazet45203a32013-06-06 08:43:22 -070072 u32 limit;
Eric Dumazet05bdd2f2011-10-20 17:45:43 -040073 const struct Qdisc_ops *ops;
Eric Dumazeta2da5702011-01-20 03:48:19 +000074 struct qdisc_size_table __rcu *stab;
Jiri Kosina59cc1f62016-08-10 11:05:15 +020075 struct hlist_node hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 u32 handle;
77 u32 parent;
David S. Miller72b25a92008-07-18 20:54:17 -070078
Eric Dumazet5e140df2009-03-20 01:33:32 -070079 struct netdev_queue *dev_queue;
Eric Dumazet5e140df2009-03-20 01:33:32 -070080
Eric Dumazet1c0d32f2016-12-04 09:48:16 -080081 struct net_rate_estimator __rcu *rate_est;
Eric Dumazet0d32ef82015-01-29 17:30:12 -080082 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
83 struct gnet_stats_queue __percpu *cpu_qstats;
84
Eric Dumazet5e140df2009-03-20 01:33:32 -070085 /*
86 * For performance sake on SMP, we put highly modified fields at the end
87 */
Eric Dumazet4d202a02016-06-21 23:16:52 -070088 struct sk_buff *gso_skb ____cacheline_aligned_in_smp;
Florian Westphal48da34b2016-09-18 00:57:34 +020089 struct qdisc_skb_head q;
Eric Dumazet0d32ef82015-01-29 17:30:12 -080090 struct gnet_stats_basic_packed bstats;
Eric Dumazetf9eb8ae2016-06-06 09:37:15 -070091 seqcount_t running;
Eric Dumazet0d32ef82015-01-29 17:30:12 -080092 struct gnet_stats_queue qstats;
Eric Dumazet4d202a02016-06-21 23:16:52 -070093 unsigned long state;
94 struct Qdisc *next_sched;
95 struct sk_buff *skb_bad_txq;
Eric Dumazet45203a32013-06-06 08:43:22 -070096 int padded;
Reshetova, Elena7b936402017-07-04 15:53:07 +030097 refcount_t refcnt;
Eric Dumazet45203a32013-06-06 08:43:22 -070098
99 spinlock_t busylock ____cacheline_aligned_in_smp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100};
101
Eric Dumazet551143d2017-08-24 21:12:28 -0700102static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
103{
104 if (qdisc->flags & TCQ_F_BUILTIN)
105 return;
106 refcount_inc(&qdisc->refcnt);
107}
108
Eric Dumazetfd245a42011-01-20 05:27:16 +0000109static inline bool qdisc_is_running(const struct Qdisc *qdisc)
Eric Dumazetbc135b22010-06-02 03:23:51 -0700110{
Eric Dumazetf9eb8ae2016-06-06 09:37:15 -0700111 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
Eric Dumazetbc135b22010-06-02 03:23:51 -0700112}
113
114static inline bool qdisc_run_begin(struct Qdisc *qdisc)
115{
Eric Dumazetfd245a42011-01-20 05:27:16 +0000116 if (qdisc_is_running(qdisc))
117 return false;
Eric Dumazet52fbb292016-06-09 07:45:11 -0700118 /* Variant of write_seqcount_begin() telling lockdep a trylock
119 * was attempted.
120 */
121 raw_write_seqcount_begin(&qdisc->running);
122 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
Eric Dumazetfd245a42011-01-20 05:27:16 +0000123 return true;
Eric Dumazetbc135b22010-06-02 03:23:51 -0700124}
125
126static inline void qdisc_run_end(struct Qdisc *qdisc)
127{
Eric Dumazetf9eb8ae2016-06-06 09:37:15 -0700128 write_seqcount_end(&qdisc->running);
Eric Dumazetfd245a42011-01-20 05:27:16 +0000129}
130
Jesper Dangaard Brouer5772e9a2014-10-01 22:35:59 +0200131static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
132{
133 return qdisc->flags & TCQ_F_ONETXQUEUE;
134}
135
136static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
137{
138#ifdef CONFIG_BQL
139 /* Non-BQL migrated drivers will return 0, too. */
140 return dql_avail(&txq->dql);
141#else
142 return 0;
143#endif
144}
145
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000146struct Qdisc_class_ops {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 /* Child qdisc manipulation */
Jarek Poplawski926e61b2009-09-15 02:53:07 -0700148 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 int (*graft)(struct Qdisc *, unsigned long cl,
150 struct Qdisc *, struct Qdisc **);
151 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
Patrick McHardy43effa12006-11-29 17:35:48 -0800152 void (*qlen_notify)(struct Qdisc *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154 /* Class manipulation routines */
WANG Cong143976c2017-08-24 16:51:29 -0700155 unsigned long (*find)(struct Qdisc *, u32 classid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 int (*change)(struct Qdisc *, u32, u32,
Patrick McHardy1e904742008-01-22 22:11:17 -0800157 struct nlattr **, unsigned long *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 int (*delete)(struct Qdisc *, unsigned long);
159 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
160
161 /* Filter manipulation */
Jiri Pirko6529eab2017-05-17 11:07:55 +0200162 struct tcf_block * (*tcf_block)(struct Qdisc *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
164 u32 classid);
165 void (*unbind_tcf)(struct Qdisc *, unsigned long);
166
167 /* rtnetlink specific */
168 int (*dump)(struct Qdisc *, unsigned long,
169 struct sk_buff *skb, struct tcmsg*);
170 int (*dump_stats)(struct Qdisc *, unsigned long,
171 struct gnet_dump *);
172};
173
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000174struct Qdisc_ops {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 struct Qdisc_ops *next;
Eric Dumazet20fea082007-11-14 01:44:41 -0800176 const struct Qdisc_class_ops *cl_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 char id[IFNAMSIZ];
178 int priv_size;
179
Eric Dumazet520ac302016-06-21 23:16:49 -0700180 int (*enqueue)(struct sk_buff *skb,
181 struct Qdisc *sch,
182 struct sk_buff **to_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 struct sk_buff * (*dequeue)(struct Qdisc *);
Jarek Poplawski90d841fd2008-10-31 00:43:45 -0700184 struct sk_buff * (*peek)(struct Qdisc *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
Patrick McHardy1e904742008-01-22 22:11:17 -0800186 int (*init)(struct Qdisc *, struct nlattr *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 void (*reset)(struct Qdisc *);
188 void (*destroy)(struct Qdisc *);
Patrick McHardy1e904742008-01-22 22:11:17 -0800189 int (*change)(struct Qdisc *, struct nlattr *arg);
David S. Miller6ec1c692009-09-06 01:58:51 -0700190 void (*attach)(struct Qdisc *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
192 int (*dump)(struct Qdisc *, struct sk_buff *);
193 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
194
195 struct module *owner;
196};
197
198
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000199struct tcf_result {
Jiri Pirkodb505142017-05-17 11:08:03 +0200200 union {
201 struct {
202 unsigned long class;
203 u32 classid;
204 };
205 const struct tcf_proto *goto_tp;
206 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207};
208
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000209struct tcf_proto_ops {
WANG Cong36272872013-12-15 20:15:11 -0800210 struct list_head head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 char kind[IFNAMSIZ];
212
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000213 int (*classify)(struct sk_buff *,
214 const struct tcf_proto *,
215 struct tcf_result *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 int (*init)(struct tcf_proto*);
WANG Cong763dbf62017-04-19 14:21:21 -0700217 void (*destroy)(struct tcf_proto*);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
WANG Cong8113c092017-08-04 21:31:43 -0700219 void* (*get)(struct tcf_proto*, u32 handle);
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000220 int (*change)(struct net *net, struct sk_buff *,
Eric W. Biedermanaf4c6642012-05-25 13:42:45 -0600221 struct tcf_proto*, unsigned long,
Patrick McHardyadd93b62008-01-22 22:11:33 -0800222 u32 handle, struct nlattr **,
WANG Cong8113c092017-08-04 21:31:43 -0700223 void **, bool);
224 int (*delete)(struct tcf_proto*, void *, bool*);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
Cong Wang07d79fc2017-08-30 14:30:36 -0700226 void (*bind_class)(void *, u32, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 /* rtnetlink specific */
WANG Cong8113c092017-08-04 21:31:43 -0700229 int (*dump)(struct net*, struct tcf_proto*, void *,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 struct sk_buff *skb, struct tcmsg*);
231
232 struct module *owner;
233};
234
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000235struct tcf_proto {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 /* Fast access part */
John Fastabend25d8c0d2014-09-12 20:05:27 -0700237 struct tcf_proto __rcu *next;
238 void __rcu *root;
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000239 int (*classify)(struct sk_buff *,
240 const struct tcf_proto *,
241 struct tcf_result *);
Al Viro66c6f522006-11-20 18:07:51 -0800242 __be16 protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
244 /* All the rest */
245 u32 prio;
246 u32 classid;
247 struct Qdisc *q;
248 void *data;
Eric Dumazetdc7f9f62011-07-05 23:25:42 +0000249 const struct tcf_proto_ops *ops;
Jiri Pirko5bc17012017-05-17 11:08:01 +0200250 struct tcf_chain *chain;
John Fastabend25d8c0d2014-09-12 20:05:27 -0700251 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252};
253
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700254struct qdisc_skb_cb {
255 unsigned int pkt_len;
Jiri Pirkodf4ab5b2012-07-20 02:28:49 +0000256 u16 slave_dev_queue_mapping;
Daniel Borkmann045efa82015-09-15 23:05:42 -0700257 u16 tc_classid;
Eric Dumazet25711782014-09-18 08:02:05 -0700258#define QDISC_CB_PRIV_LEN 20
259 unsigned char data[QDISC_CB_PRIV_LEN];
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700260};
261
Jiri Pirko2190d1d2017-05-17 11:07:59 +0200262struct tcf_chain {
263 struct tcf_proto __rcu *filter_chain;
Jiri Pirko6529eab2017-05-17 11:07:55 +0200264 struct tcf_proto __rcu **p_filter_chain;
Jiri Pirko5bc17012017-05-17 11:08:01 +0200265 struct list_head list;
266 struct tcf_block *block;
267 u32 index; /* chain index */
268 unsigned int refcnt;
Jiri Pirko6529eab2017-05-17 11:07:55 +0200269};
270
Jiri Pirko2190d1d2017-05-17 11:07:59 +0200271struct tcf_block {
Jiri Pirko5bc17012017-05-17 11:08:01 +0200272 struct list_head chain_list;
Jiri Pirko855319b2017-10-13 14:00:58 +0200273 struct net *net;
Jiri Pirko69d78ef2017-10-13 14:00:57 +0200274 struct Qdisc *q;
Jiri Pirko2190d1d2017-05-17 11:07:59 +0200275};
276
David S. Miller16bda132012-02-06 15:14:37 -0500277static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
278{
279 struct qdisc_skb_cb *qcb;
Eric Dumazet5ee31c682012-06-12 06:03:51 +0000280
281 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
David S. Miller16bda132012-02-06 15:14:37 -0500282 BUILD_BUG_ON(sizeof(qcb->data) < sz);
283}
284
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400285static inline int qdisc_qlen(const struct Qdisc *q)
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +0000286{
287 return q->q.qlen;
288}
289
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000290static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700291{
292 return (struct qdisc_skb_cb *)skb->cb;
293}
294
David S. Miller838740002008-07-17 00:53:03 -0700295static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
296{
297 return &qdisc->q.lock;
298}
299
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400300static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
David S. Miller7698b4f2008-07-16 01:42:40 -0700301{
John Fastabend46e5da40a2014-09-12 20:04:52 -0700302 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
303
304 return q;
David S. Miller7698b4f2008-07-16 01:42:40 -0700305}
306
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400307static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
Jarek Poplawski2540e052008-08-21 05:11:14 -0700308{
309 return qdisc->dev_queue->qdisc_sleeping;
310}
311
David S. Miller7e43f112008-08-02 23:27:37 -0700312/* The qdisc root lock is a mechanism by which to top level
313 * of a qdisc tree can be locked from any qdisc node in the
314 * forest. This allows changing the configuration of some
315 * aspect of the qdisc tree while blocking out asynchronous
316 * qdisc access in the packet processing paths.
317 *
318 * It is only legal to do this when the root will not change
319 * on us. Otherwise we'll potentially lock the wrong qdisc
320 * root. This is enforced by holding the RTNL semaphore, which
321 * all users of this lock accessor must do.
322 */
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400323static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
David S. Miller7698b4f2008-07-16 01:42:40 -0700324{
325 struct Qdisc *root = qdisc_root(qdisc);
326
David S. Miller7e43f112008-08-02 23:27:37 -0700327 ASSERT_RTNL();
David S. Miller838740002008-07-17 00:53:03 -0700328 return qdisc_lock(root);
David S. Miller7698b4f2008-07-16 01:42:40 -0700329}
330
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400331static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
Jarek Poplawskif6f9b932008-08-27 02:25:17 -0700332{
333 struct Qdisc *root = qdisc_root_sleeping(qdisc);
334
335 ASSERT_RTNL();
336 return qdisc_lock(root);
337}
338
Eric Dumazetedb09eb2016-06-06 09:37:16 -0700339static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
340{
341 struct Qdisc *root = qdisc_root_sleeping(qdisc);
342
343 ASSERT_RTNL();
344 return &root->running;
345}
346
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400347static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
David S. Miller5ce2d482008-07-08 17:06:30 -0700348{
349 return qdisc->dev_queue->dev;
350}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400352static inline void sch_tree_lock(const struct Qdisc *q)
David S. Miller78a5b302008-07-16 03:12:24 -0700353{
Jarek Poplawskife439dd2008-08-27 02:27:10 -0700354 spin_lock_bh(qdisc_root_sleeping_lock(q));
David S. Miller78a5b302008-07-16 03:12:24 -0700355}
356
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400357static inline void sch_tree_unlock(const struct Qdisc *q)
David S. Miller78a5b302008-07-16 03:12:24 -0700358{
Jarek Poplawskife439dd2008-08-27 02:27:10 -0700359 spin_unlock_bh(qdisc_root_sleeping_lock(q));
David S. Miller78a5b302008-07-16 03:12:24 -0700360}
361
362#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
363#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364
Thomas Grafe41a33e2005-07-05 14:14:30 -0700365extern struct Qdisc noop_qdisc;
366extern struct Qdisc_ops noop_qdisc_ops;
David S. Miller6ec1c692009-09-06 01:58:51 -0700367extern struct Qdisc_ops pfifo_fast_ops;
368extern struct Qdisc_ops mq_qdisc_ops;
Phil Sutterd66d6c32015-08-27 21:21:38 +0200369extern struct Qdisc_ops noqueue_qdisc_ops;
stephen hemminger6da7c8f2013-08-27 16:19:08 -0700370extern const struct Qdisc_ops *default_qdisc_ops;
Eric Dumazet1f27cde2016-03-02 08:21:43 -0800371static inline const struct Qdisc_ops *
372get_default_qdisc_ops(const struct net_device *dev, int ntx)
373{
374 return ntx < dev->real_num_tx_queues ?
375 default_qdisc_ops : &pfifo_fast_ops;
376}
Thomas Grafe41a33e2005-07-05 14:14:30 -0700377
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000378struct Qdisc_class_common {
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700379 u32 classid;
380 struct hlist_node hnode;
381};
382
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000383struct Qdisc_class_hash {
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700384 struct hlist_head *hash;
385 unsigned int hashsize;
386 unsigned int hashmask;
387 unsigned int hashelems;
388};
389
390static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
391{
392 id ^= id >> 8;
393 id ^= id >> 4;
394 return id & mask;
395}
396
397static inline struct Qdisc_class_common *
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400398qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700399{
400 struct Qdisc_class_common *cl;
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700401 unsigned int h;
402
Gao Feng7d3f0cd2017-08-18 15:23:24 +0800403 if (!id)
404 return NULL;
405
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700406 h = qdisc_class_hash(id, hash->hashmask);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800407 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700408 if (cl->classid == id)
409 return cl;
410 }
411 return NULL;
412}
413
Joe Perches5c152572013-07-30 22:47:13 -0700414int qdisc_class_hash_init(struct Qdisc_class_hash *);
415void qdisc_class_hash_insert(struct Qdisc_class_hash *,
416 struct Qdisc_class_common *);
417void qdisc_class_hash_remove(struct Qdisc_class_hash *,
418 struct Qdisc_class_common *);
419void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
420void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
Patrick McHardy6fe1c7a2008-07-05 23:21:31 -0700421
Joe Perches5c152572013-07-30 22:47:13 -0700422void dev_init_scheduler(struct net_device *dev);
423void dev_shutdown(struct net_device *dev);
424void dev_activate(struct net_device *dev);
425void dev_deactivate(struct net_device *dev);
426void dev_deactivate_many(struct list_head *head);
427struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
428 struct Qdisc *qdisc);
429void qdisc_reset(struct Qdisc *qdisc);
430void qdisc_destroy(struct Qdisc *qdisc);
WANG Cong2ccccf52016-02-25 14:55:01 -0800431void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
432 unsigned int len);
Joe Perches5c152572013-07-30 22:47:13 -0700433struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
stephen hemmingerd2a7f262013-08-31 10:15:50 -0700434 const struct Qdisc_ops *ops);
Joe Perches5c152572013-07-30 22:47:13 -0700435struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
stephen hemmingerd2a7f262013-08-31 10:15:50 -0700436 const struct Qdisc_ops *ops, u32 parentid);
Joe Perches5c152572013-07-30 22:47:13 -0700437void __qdisc_calculate_pkt_len(struct sk_buff *skb,
438 const struct qdisc_size_table *stab);
Alexei Starovoitov27b29f62015-09-15 23:05:43 -0700439int skb_do_redirect(struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
Willem de Bruijna5135bc2017-01-07 17:06:36 -0500441static inline void skb_reset_tc(struct sk_buff *skb)
442{
443#ifdef CONFIG_NET_CLS_ACT
Willem de Bruijnbc31c902017-01-07 17:06:38 -0500444 skb->tc_redirected = 0;
Willem de Bruijna5135bc2017-01-07 17:06:36 -0500445#endif
446}
447
Daniel Borkmannfdc54322016-01-07 15:50:22 +0100448static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
449{
450#ifdef CONFIG_NET_CLS_ACT
Willem de Bruijn8dc07fd2017-01-07 17:06:37 -0500451 return skb->tc_at_ingress;
Daniel Borkmannfdc54322016-01-07 15:50:22 +0100452#else
453 return false;
454#endif
455}
456
Willem de Bruijne7246e12017-01-07 17:06:35 -0500457static inline bool skb_skip_tc_classify(struct sk_buff *skb)
458{
459#ifdef CONFIG_NET_CLS_ACT
460 if (skb->tc_skip_classify) {
461 skb->tc_skip_classify = 0;
462 return true;
463 }
464#endif
465 return false;
466}
467
John Fastabendf0796d52010-07-01 13:21:57 +0000468/* Reset all TX qdiscs greater then index of a device. */
469static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
David S. Miller5aa70992008-07-08 22:59:10 -0700470{
John Fastabend4ef6acf2010-07-01 13:21:35 +0000471 struct Qdisc *qdisc;
472
John Fastabendf0796d52010-07-01 13:21:57 +0000473 for (; i < dev->num_tx_queues; i++) {
John Fastabend46e5da40a2014-09-12 20:04:52 -0700474 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
John Fastabend4ef6acf2010-07-01 13:21:35 +0000475 if (qdisc) {
476 spin_lock_bh(qdisc_lock(qdisc));
477 qdisc_reset(qdisc);
478 spin_unlock_bh(qdisc_lock(qdisc));
479 }
480 }
David S. Miller5aa70992008-07-08 22:59:10 -0700481}
482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483static inline void qdisc_reset_all_tx(struct net_device *dev)
Thomas Graf9972b252005-06-18 22:57:26 -0700484{
John Fastabendf0796d52010-07-01 13:21:57 +0000485 qdisc_reset_all_tx_gt(dev, 0);
Thomas Graf9972b252005-06-18 22:57:26 -0700486}
487
David S. Miller3e745dd2008-07-08 23:00:25 -0700488/* Are all TX queues of the device empty? */
489static inline bool qdisc_all_tx_empty(const struct net_device *dev)
490{
David S. Millere8a04642008-07-17 00:34:19 -0700491 unsigned int i;
John Fastabend46e5da40a2014-09-12 20:04:52 -0700492
493 rcu_read_lock();
David S. Millere8a04642008-07-17 00:34:19 -0700494 for (i = 0; i < dev->num_tx_queues; i++) {
495 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
John Fastabend46e5da40a2014-09-12 20:04:52 -0700496 const struct Qdisc *q = rcu_dereference(txq->qdisc);
David S. Miller3e745dd2008-07-08 23:00:25 -0700497
John Fastabend46e5da40a2014-09-12 20:04:52 -0700498 if (q->q.qlen) {
499 rcu_read_unlock();
David S. Millere8a04642008-07-17 00:34:19 -0700500 return false;
John Fastabend46e5da40a2014-09-12 20:04:52 -0700501 }
David S. Millere8a04642008-07-17 00:34:19 -0700502 }
John Fastabend46e5da40a2014-09-12 20:04:52 -0700503 rcu_read_unlock();
David S. Millere8a04642008-07-17 00:34:19 -0700504 return true;
David S. Miller3e745dd2008-07-08 23:00:25 -0700505}
506
David S. Miller6fa98642008-07-08 23:01:06 -0700507/* Are any of the TX qdiscs changing? */
Eric Dumazet05bdd2f2011-10-20 17:45:43 -0400508static inline bool qdisc_tx_changing(const struct net_device *dev)
David S. Miller6fa98642008-07-08 23:01:06 -0700509{
David S. Millere8a04642008-07-17 00:34:19 -0700510 unsigned int i;
John Fastabend46e5da40a2014-09-12 20:04:52 -0700511
David S. Millere8a04642008-07-17 00:34:19 -0700512 for (i = 0; i < dev->num_tx_queues; i++) {
513 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
John Fastabend46e5da40a2014-09-12 20:04:52 -0700514 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
David S. Millere8a04642008-07-17 00:34:19 -0700515 return true;
516 }
517 return false;
David S. Miller6fa98642008-07-08 23:01:06 -0700518}
519
David S. Millere8a04642008-07-17 00:34:19 -0700520/* Is the device using the noop qdisc on all queues? */
David S. Miller05297942008-07-08 23:01:27 -0700521static inline bool qdisc_tx_is_noop(const struct net_device *dev)
522{
David S. Millere8a04642008-07-17 00:34:19 -0700523 unsigned int i;
John Fastabend46e5da40a2014-09-12 20:04:52 -0700524
David S. Millere8a04642008-07-17 00:34:19 -0700525 for (i = 0; i < dev->num_tx_queues; i++) {
526 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
John Fastabend46e5da40a2014-09-12 20:04:52 -0700527 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
David S. Millere8a04642008-07-17 00:34:19 -0700528 return false;
529 }
530 return true;
David S. Miller05297942008-07-08 23:01:27 -0700531}
532
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000533static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700534{
Jussi Kivilinna175f9c12008-07-20 00:08:47 -0700535 return qdisc_skb_cb(skb)->pkt_len;
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700536}
537
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700538/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700539enum net_xmit_qdisc_t {
540 __NET_XMIT_STOLEN = 0x00010000,
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700541 __NET_XMIT_BYPASS = 0x00020000,
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700542};
543
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700544#ifdef CONFIG_NET_CLS_ACT
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700545#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700546#else
547#define net_xmit_drop_count(e) (1)
548#endif
549
Eric Dumazeta2da5702011-01-20 03:48:19 +0000550static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
551 const struct Qdisc *sch)
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700552{
David S. Miller3a682fb2008-07-20 18:13:01 -0700553#ifdef CONFIG_NET_SCHED
Eric Dumazeta2da5702011-01-20 03:48:19 +0000554 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
555
556 if (stab)
557 __qdisc_calculate_pkt_len(skb, stab);
David S. Miller3a682fb2008-07-20 18:13:01 -0700558#endif
Eric Dumazeta2da5702011-01-20 03:48:19 +0000559}
560
Eric Dumazet520ac302016-06-21 23:16:49 -0700561static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
562 struct sk_buff **to_free)
Eric Dumazeta2da5702011-01-20 03:48:19 +0000563{
564 qdisc_calculate_pkt_len(skb, sch);
Eric Dumazet520ac302016-06-21 23:16:49 -0700565 return sch->enqueue(skb, sch, to_free);
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700566}
567
John Fastabend22e0f8b2014-09-28 11:52:56 -0700568static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
569{
570 return q->flags & TCQ_F_CPUSTATS;
571}
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000572
Amir Vadai38040702016-05-13 12:55:35 +0000573static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
574 __u64 bytes, __u32 packets)
575{
576 bstats->bytes += bytes;
577 bstats->packets += packets;
578}
579
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000580static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
581 const struct sk_buff *skb)
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +0000582{
Amir Vadai38040702016-05-13 12:55:35 +0000583 _bstats_update(bstats,
584 qdisc_pkt_len(skb),
585 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
586}
587
588static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
589 __u64 bytes, __u32 packets)
590{
591 u64_stats_update_begin(&bstats->syncp);
592 _bstats_update(&bstats->bstats, bytes, packets);
593 u64_stats_update_end(&bstats->syncp);
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000594}
595
Eric Dumazet24ea5912015-07-06 05:18:03 -0700596static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
597 const struct sk_buff *skb)
John Fastabend22e0f8b2014-09-28 11:52:56 -0700598{
John Fastabend22e0f8b2014-09-28 11:52:56 -0700599 u64_stats_update_begin(&bstats->syncp);
600 bstats_update(&bstats->bstats, skb);
601 u64_stats_update_end(&bstats->syncp);
602}
603
Eric Dumazet24ea5912015-07-06 05:18:03 -0700604static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
605 const struct sk_buff *skb)
606{
607 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
608}
609
Eric Dumazetbfe0d022011-01-09 08:30:54 +0000610static inline void qdisc_bstats_update(struct Qdisc *sch,
611 const struct sk_buff *skb)
612{
613 bstats_update(&sch->bstats, skb);
Krishna Kumarbbd8a0d2009-08-06 01:44:21 +0000614}
615
John Fastabend25331d62014-09-28 11:53:29 -0700616static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
617 const struct sk_buff *skb)
618{
619 sch->qstats.backlog -= qdisc_pkt_len(skb);
620}
621
622static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
623 const struct sk_buff *skb)
624{
625 sch->qstats.backlog += qdisc_pkt_len(skb);
626}
627
628static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
629{
630 sch->qstats.drops += count;
631}
632
Eric Dumazet24ea5912015-07-06 05:18:03 -0700633static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
John Fastabend25331d62014-09-28 11:53:29 -0700634{
Eric Dumazet24ea5912015-07-06 05:18:03 -0700635 qstats->drops++;
John Fastabend25331d62014-09-28 11:53:29 -0700636}
637
Eric Dumazet24ea5912015-07-06 05:18:03 -0700638static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
John Fastabendb0ab6f92014-09-28 11:54:24 -0700639{
Eric Dumazet24ea5912015-07-06 05:18:03 -0700640 qstats->overlimits++;
641}
John Fastabendb0ab6f92014-09-28 11:54:24 -0700642
Eric Dumazet24ea5912015-07-06 05:18:03 -0700643static inline void qdisc_qstats_drop(struct Qdisc *sch)
644{
645 qstats_drop_inc(&sch->qstats);
646}
647
648static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
649{
Eric Dumazeteb60a8d2016-08-24 10:23:34 -0700650 this_cpu_inc(sch->cpu_qstats->drops);
John Fastabendb0ab6f92014-09-28 11:54:24 -0700651}
652
John Fastabend25331d62014-09-28 11:53:29 -0700653static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
654{
655 sch->qstats.overlimits++;
656}
657
Florian Westphal48da34b2016-09-18 00:57:34 +0200658static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
Thomas Graf9972b252005-06-18 22:57:26 -0700659{
Florian Westphal48da34b2016-09-18 00:57:34 +0200660 qh->head = NULL;
661 qh->tail = NULL;
662 qh->qlen = 0;
663}
664
665static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
666 struct qdisc_skb_head *qh)
667{
668 struct sk_buff *last = qh->tail;
669
670 if (last) {
671 skb->next = NULL;
672 last->next = skb;
673 qh->tail = skb;
674 } else {
675 qh->tail = skb;
676 qh->head = skb;
677 }
678 qh->qlen++;
John Fastabend25331d62014-09-28 11:53:29 -0700679 qdisc_qstats_backlog_inc(sch, skb);
Thomas Graf9972b252005-06-18 22:57:26 -0700680
681 return NET_XMIT_SUCCESS;
682}
683
684static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
685{
686 return __qdisc_enqueue_tail(skb, sch, &sch->q);
687}
688
Florian Westphal48da34b2016-09-18 00:57:34 +0200689static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
Thomas Graf9972b252005-06-18 22:57:26 -0700690{
Florian Westphal48da34b2016-09-18 00:57:34 +0200691 struct sk_buff *skb = qh->head;
692
693 if (likely(skb != NULL)) {
694 qh->head = skb->next;
695 qh->qlen--;
696 if (qh->head == NULL)
697 qh->tail = NULL;
698 skb->next = NULL;
699 }
Thomas Graf9972b252005-06-18 22:57:26 -0700700
Florian Westphalec323362016-09-18 00:57:32 +0200701 return skb;
702}
703
704static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
705{
706 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
707
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800708 if (likely(skb != NULL)) {
John Fastabend25331d62014-09-28 11:53:29 -0700709 qdisc_qstats_backlog_dec(sch, skb);
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800710 qdisc_bstats_update(sch, skb);
711 }
Thomas Graf9972b252005-06-18 22:57:26 -0700712
713 return skb;
714}
715
Eric Dumazet520ac302016-06-21 23:16:49 -0700716/* Instead of calling kfree_skb() while root qdisc lock is held,
717 * queue the skb for future freeing at end of __dev_xmit_skb()
718 */
719static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
720{
721 skb->next = *to_free;
722 *to_free = skb;
723}
724
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000725static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
Florian Westphal48da34b2016-09-18 00:57:34 +0200726 struct qdisc_skb_head *qh,
Eric Dumazet520ac302016-06-21 23:16:49 -0700727 struct sk_buff **to_free)
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000728{
Florian Westphal48da34b2016-09-18 00:57:34 +0200729 struct sk_buff *skb = __qdisc_dequeue_head(qh);
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000730
731 if (likely(skb != NULL)) {
732 unsigned int len = qdisc_pkt_len(skb);
Eric Dumazet520ac302016-06-21 23:16:49 -0700733
John Fastabend25331d62014-09-28 11:53:29 -0700734 qdisc_qstats_backlog_dec(sch, skb);
Eric Dumazet520ac302016-06-21 23:16:49 -0700735 __qdisc_drop(skb, to_free);
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000736 return len;
737 }
738
739 return 0;
740}
741
Eric Dumazet520ac302016-06-21 23:16:49 -0700742static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
743 struct sk_buff **to_free)
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000744{
Eric Dumazet520ac302016-06-21 23:16:49 -0700745 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
Hagen Paul Pfeifer57dbb2d2010-01-24 12:30:59 +0000746}
747
Patrick McHardy48a8f512008-10-31 00:44:18 -0700748static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
749{
Florian Westphal48da34b2016-09-18 00:57:34 +0200750 const struct qdisc_skb_head *qh = &sch->q;
751
752 return qh->head;
Patrick McHardy48a8f512008-10-31 00:44:18 -0700753}
754
Jarek Poplawski77be1552008-10-31 00:47:01 -0700755/* generic pseudo peek method for non-work-conserving qdisc */
756static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
757{
758 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800759 if (!sch->gso_skb) {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700760 sch->gso_skb = sch->dequeue(sch);
WANG Conga27758f2016-06-03 15:05:57 -0700761 if (sch->gso_skb) {
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800762 /* it's still part of the queue */
WANG Conga27758f2016-06-03 15:05:57 -0700763 qdisc_qstats_backlog_inc(sch, sch->gso_skb);
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800764 sch->q.qlen++;
WANG Conga27758f2016-06-03 15:05:57 -0700765 }
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800766 }
Jarek Poplawski77be1552008-10-31 00:47:01 -0700767
768 return sch->gso_skb;
769}
770
771/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
772static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
773{
774 struct sk_buff *skb = sch->gso_skb;
775
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800776 if (skb) {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700777 sch->gso_skb = NULL;
WANG Conga27758f2016-06-03 15:05:57 -0700778 qdisc_qstats_backlog_dec(sch, skb);
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800779 sch->q.qlen--;
780 } else {
Jarek Poplawski77be1552008-10-31 00:47:01 -0700781 skb = sch->dequeue(sch);
Jarek Poplawski61c9eaf2008-11-05 16:02:34 -0800782 }
Jarek Poplawski77be1552008-10-31 00:47:01 -0700783
784 return skb;
785}
786
Florian Westphal48da34b2016-09-18 00:57:34 +0200787static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
Thomas Graf9972b252005-06-18 22:57:26 -0700788{
789 /*
790 * We do not know the backlog in bytes of this list, it
791 * is up to the caller to correct it
792 */
Florian Westphal48da34b2016-09-18 00:57:34 +0200793 ASSERT_RTNL();
794 if (qh->qlen) {
795 rtnl_kfree_skbs(qh->head, qh->tail);
796
797 qh->head = NULL;
798 qh->tail = NULL;
799 qh->qlen = 0;
Eric Dumazet1b5c5492016-06-13 20:21:50 -0700800 }
Thomas Graf9972b252005-06-18 22:57:26 -0700801}
802
803static inline void qdisc_reset_queue(struct Qdisc *sch)
804{
Eric Dumazet1b5c5492016-06-13 20:21:50 -0700805 __qdisc_reset_queue(&sch->q);
Thomas Graf9972b252005-06-18 22:57:26 -0700806 sch->qstats.backlog = 0;
807}
808
WANG Cong86a79962016-02-25 14:55:00 -0800809static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
810 struct Qdisc **pold)
811{
812 struct Qdisc *old;
813
814 sch_tree_lock(sch);
815 old = *pold;
816 *pold = new;
817 if (old != NULL) {
Konstantin Khlebnikov68a66d12017-08-19 15:37:07 +0300818 unsigned int qlen = old->q.qlen;
819 unsigned int backlog = old->qstats.backlog;
820
WANG Cong86a79962016-02-25 14:55:00 -0800821 qdisc_reset(old);
Konstantin Khlebnikov68a66d12017-08-19 15:37:07 +0300822 qdisc_tree_reduce_backlog(old, qlen, backlog);
WANG Cong86a79962016-02-25 14:55:00 -0800823 }
824 sch_tree_unlock(sch);
825
826 return old;
827}
828
Eric Dumazet1b5c5492016-06-13 20:21:50 -0700829static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
830{
831 rtnl_kfree_skbs(skb, skb);
832 qdisc_qstats_drop(sch);
833}
834
Eric Dumazet520ac302016-06-21 23:16:49 -0700835
836static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
837 struct sk_buff **to_free)
Thomas Graf9972b252005-06-18 22:57:26 -0700838{
Eric Dumazet520ac302016-06-21 23:16:49 -0700839 __qdisc_drop(skb, to_free);
John Fastabend25331d62014-09-28 11:53:29 -0700840 qdisc_qstats_drop(sch);
Thomas Graf9972b252005-06-18 22:57:26 -0700841
842 return NET_XMIT_DROP;
843}
844
Jesper Dangaard Brouere9bef552007-09-12 16:35:24 +0200845/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
846 long it will take to send a packet given its size.
847 */
848static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
849{
Jesper Dangaard Brouere08b0992007-09-12 16:36:28 +0200850 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
851 if (slot < 0)
852 slot = 0;
Jesper Dangaard Brouere9bef552007-09-12 16:35:24 +0200853 slot >>= rtab->rate.cell_log;
854 if (slot > 255)
Eric Dumazeta02cec22010-09-22 20:43:57 +0000855 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
Jesper Dangaard Brouere9bef552007-09-12 16:35:24 +0200856 return rtab->data[slot];
857}
858
Jiri Pirko292f1c72013-02-12 00:12:03 +0000859struct psched_ratecfg {
Eric Dumazet130d3d62013-06-06 13:56:19 -0700860 u64 rate_bytes_ps; /* bytes per second */
Eric Dumazet01cb71d2013-06-02 13:55:05 +0000861 u32 mult;
862 u16 overhead;
Jesper Dangaard Brouer8a8e3d82013-08-14 23:47:11 +0200863 u8 linklayer;
Eric Dumazet01cb71d2013-06-02 13:55:05 +0000864 u8 shift;
Jiri Pirko292f1c72013-02-12 00:12:03 +0000865};
866
867static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
868 unsigned int len)
869{
Jesper Dangaard Brouer8a8e3d82013-08-14 23:47:11 +0200870 len += r->overhead;
871
872 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
873 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
874
875 return ((u64)len * r->mult) >> r->shift;
Jiri Pirko292f1c72013-02-12 00:12:03 +0000876}
877
Joe Perches5c152572013-07-30 22:47:13 -0700878void psched_ratecfg_precompute(struct psched_ratecfg *r,
Eric Dumazet3e1e3aa2013-09-19 09:10:03 -0700879 const struct tc_ratespec *conf,
880 u64 rate64);
Jiri Pirko292f1c72013-02-12 00:12:03 +0000881
Eric Dumazet01cb71d2013-06-02 13:55:05 +0000882static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
883 const struct psched_ratecfg *r)
Jiri Pirko292f1c72013-02-12 00:12:03 +0000884{
Eric Dumazet01cb71d2013-06-02 13:55:05 +0000885 memset(res, 0, sizeof(*res));
Eric Dumazet3e1e3aa2013-09-19 09:10:03 -0700886
887 /* legacy struct tc_ratespec has a 32bit @rate field
888 * Qdisc using 64bit rate should add new attributes
889 * in order to maintain compatibility.
890 */
891 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
892
Eric Dumazet01cb71d2013-06-02 13:55:05 +0000893 res->overhead = r->overhead;
Jesper Dangaard Brouer8a8e3d82013-08-14 23:47:11 +0200894 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
Jiri Pirko292f1c72013-02-12 00:12:03 +0000895}
896
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897#endif