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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __NET_SCHED_GENERIC_H |
3 | #define __NET_SCHED_GENERIC_H | |
4 | ||
1da177e4 LT |
5 | #include <linux/netdevice.h> |
6 | #include <linux/types.h> | |
7 | #include <linux/rcupdate.h> | |
1da177e4 LT |
8 | #include <linux/pkt_sched.h> |
9 | #include <linux/pkt_cls.h> | |
22e0f8b9 | 10 | #include <linux/percpu.h> |
5772e9a3 | 11 | #include <linux/dynamic_queue_limits.h> |
5bc17018 | 12 | #include <linux/list.h> |
7b936405 | 13 | #include <linux/refcount.h> |
7aa0045d | 14 | #include <linux/workqueue.h> |
1da177e4 | 15 | #include <net/gen_stats.h> |
be577ddc | 16 | #include <net/rtnetlink.h> |
1da177e4 LT |
17 | |
18 | struct Qdisc_ops; | |
19 | struct qdisc_walker; | |
20 | struct tcf_walker; | |
21 | struct module; | |
22 | ||
fd2c3ef7 | 23 | struct qdisc_rate_table { |
1da177e4 LT |
24 | struct tc_ratespec rate; |
25 | u32 data[256]; | |
26 | struct qdisc_rate_table *next; | |
27 | int refcnt; | |
28 | }; | |
29 | ||
fd2c3ef7 | 30 | enum qdisc_state_t { |
37437bb2 | 31 | __QDISC_STATE_SCHED, |
a9312ae8 | 32 | __QDISC_STATE_DEACTIVATED, |
e2627c8c DM |
33 | }; |
34 | ||
175f9c1b | 35 | struct qdisc_size_table { |
a2da570d | 36 | struct rcu_head rcu; |
175f9c1b JK |
37 | struct list_head list; |
38 | struct tc_sizespec szopts; | |
39 | int refcnt; | |
40 | u16 data[]; | |
41 | }; | |
42 | ||
48da34b7 FW |
43 | /* similar to sk_buff_head, but skb->prev pointer is undefined. */ |
44 | struct qdisc_skb_head { | |
45 | struct sk_buff *head; | |
46 | struct sk_buff *tail; | |
47 | __u32 qlen; | |
48 | spinlock_t lock; | |
49 | }; | |
50 | ||
fd2c3ef7 | 51 | struct Qdisc { |
520ac30f ED |
52 | int (*enqueue)(struct sk_buff *skb, |
53 | struct Qdisc *sch, | |
54 | struct sk_buff **to_free); | |
55 | struct sk_buff * (*dequeue)(struct Qdisc *sch); | |
05bdd2f1 | 56 | unsigned int flags; |
b00355db | 57 | #define TCQ_F_BUILTIN 1 |
fd245a4a ED |
58 | #define TCQ_F_INGRESS 2 |
59 | #define TCQ_F_CAN_BYPASS 4 | |
60 | #define TCQ_F_MQROOT 8 | |
1abbe139 ED |
61 | #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for |
62 | * q->dev_queue : It can test | |
63 | * netif_xmit_frozen_or_stopped() before | |
64 | * dequeueing next packet. | |
65 | * Its true for MQ/MQPRIO slaves, or non | |
66 | * multiqueue device. | |
67 | */ | |
b00355db | 68 | #define TCQ_F_WARN_NONWC (1 << 16) |
22e0f8b9 | 69 | #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ |
4eaf3b84 ED |
70 | #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : |
71 | * qdisc_tree_decrease_qlen() should stop. | |
72 | */ | |
49b49971 | 73 | #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ |
45203a3b | 74 | u32 limit; |
05bdd2f1 | 75 | const struct Qdisc_ops *ops; |
a2da570d | 76 | struct qdisc_size_table __rcu *stab; |
59cc1f61 | 77 | struct hlist_node hash; |
1da177e4 LT |
78 | u32 handle; |
79 | u32 parent; | |
72b25a91 | 80 | |
5e140dfc | 81 | struct netdev_queue *dev_queue; |
5e140dfc | 82 | |
1c0d32fd | 83 | struct net_rate_estimator __rcu *rate_est; |
0d32ef8c ED |
84 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; |
85 | struct gnet_stats_queue __percpu *cpu_qstats; | |
86 | ||
5e140dfc ED |
87 | /* |
88 | * For performance sake on SMP, we put highly modified fields at the end | |
89 | */ | |
4d202a0d | 90 | struct sk_buff *gso_skb ____cacheline_aligned_in_smp; |
48da34b7 | 91 | struct qdisc_skb_head q; |
0d32ef8c | 92 | struct gnet_stats_basic_packed bstats; |
f9eb8aea | 93 | seqcount_t running; |
0d32ef8c | 94 | struct gnet_stats_queue qstats; |
4d202a0d ED |
95 | unsigned long state; |
96 | struct Qdisc *next_sched; | |
97 | struct sk_buff *skb_bad_txq; | |
45203a3b | 98 | int padded; |
7b936405 | 99 | refcount_t refcnt; |
45203a3b ED |
100 | |
101 | spinlock_t busylock ____cacheline_aligned_in_smp; | |
1da177e4 LT |
102 | }; |
103 | ||
551143d8 ED |
104 | static inline void qdisc_refcount_inc(struct Qdisc *qdisc) |
105 | { | |
106 | if (qdisc->flags & TCQ_F_BUILTIN) | |
107 | return; | |
108 | refcount_inc(&qdisc->refcnt); | |
109 | } | |
110 | ||
fd245a4a | 111 | static inline bool qdisc_is_running(const struct Qdisc *qdisc) |
bc135b23 | 112 | { |
f9eb8aea | 113 | return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; |
bc135b23 ED |
114 | } |
115 | ||
116 | static inline bool qdisc_run_begin(struct Qdisc *qdisc) | |
117 | { | |
fd245a4a ED |
118 | if (qdisc_is_running(qdisc)) |
119 | return false; | |
52fbb290 ED |
120 | /* Variant of write_seqcount_begin() telling lockdep a trylock |
121 | * was attempted. | |
122 | */ | |
123 | raw_write_seqcount_begin(&qdisc->running); | |
124 | seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_); | |
fd245a4a | 125 | return true; |
bc135b23 ED |
126 | } |
127 | ||
128 | static inline void qdisc_run_end(struct Qdisc *qdisc) | |
129 | { | |
f9eb8aea | 130 | write_seqcount_end(&qdisc->running); |
fd245a4a ED |
131 | } |
132 | ||
5772e9a3 JDB |
133 | static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) |
134 | { | |
135 | return qdisc->flags & TCQ_F_ONETXQUEUE; | |
136 | } | |
137 | ||
138 | static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) | |
139 | { | |
140 | #ifdef CONFIG_BQL | |
141 | /* Non-BQL migrated drivers will return 0, too. */ | |
142 | return dql_avail(&txq->dql); | |
143 | #else | |
144 | return 0; | |
145 | #endif | |
146 | } | |
147 | ||
fd2c3ef7 | 148 | struct Qdisc_class_ops { |
1da177e4 | 149 | /* Child qdisc manipulation */ |
926e61b7 | 150 | struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); |
1da177e4 LT |
151 | int (*graft)(struct Qdisc *, unsigned long cl, |
152 | struct Qdisc *, struct Qdisc **); | |
153 | struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); | |
43effa1e | 154 | void (*qlen_notify)(struct Qdisc *, unsigned long); |
1da177e4 LT |
155 | |
156 | /* Class manipulation routines */ | |
143976ce | 157 | unsigned long (*find)(struct Qdisc *, u32 classid); |
1da177e4 | 158 | int (*change)(struct Qdisc *, u32, u32, |
1e90474c | 159 | struct nlattr **, unsigned long *); |
1da177e4 LT |
160 | int (*delete)(struct Qdisc *, unsigned long); |
161 | void (*walk)(struct Qdisc *, struct qdisc_walker * arg); | |
162 | ||
163 | /* Filter manipulation */ | |
0ac4bd68 AA |
164 | struct tcf_block * (*tcf_block)(struct Qdisc *sch, |
165 | unsigned long arg); | |
1da177e4 LT |
166 | unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, |
167 | u32 classid); | |
168 | void (*unbind_tcf)(struct Qdisc *, unsigned long); | |
169 | ||
170 | /* rtnetlink specific */ | |
171 | int (*dump)(struct Qdisc *, unsigned long, | |
172 | struct sk_buff *skb, struct tcmsg*); | |
173 | int (*dump_stats)(struct Qdisc *, unsigned long, | |
174 | struct gnet_dump *); | |
175 | }; | |
176 | ||
fd2c3ef7 | 177 | struct Qdisc_ops { |
1da177e4 | 178 | struct Qdisc_ops *next; |
20fea08b | 179 | const struct Qdisc_class_ops *cl_ops; |
1da177e4 LT |
180 | char id[IFNAMSIZ]; |
181 | int priv_size; | |
182 | ||
520ac30f ED |
183 | int (*enqueue)(struct sk_buff *skb, |
184 | struct Qdisc *sch, | |
185 | struct sk_buff **to_free); | |
1da177e4 | 186 | struct sk_buff * (*dequeue)(struct Qdisc *); |
90d841fd | 187 | struct sk_buff * (*peek)(struct Qdisc *); |
1da177e4 | 188 | |
0ac4bd68 | 189 | int (*init)(struct Qdisc *sch, struct nlattr *arg); |
1da177e4 LT |
190 | void (*reset)(struct Qdisc *); |
191 | void (*destroy)(struct Qdisc *); | |
0ac4bd68 AA |
192 | int (*change)(struct Qdisc *sch, |
193 | struct nlattr *arg); | |
194 | void (*attach)(struct Qdisc *sch); | |
1da177e4 LT |
195 | |
196 | int (*dump)(struct Qdisc *, struct sk_buff *); | |
197 | int (*dump_stats)(struct Qdisc *, struct gnet_dump *); | |
198 | ||
199 | struct module *owner; | |
200 | }; | |
201 | ||
202 | ||
fd2c3ef7 | 203 | struct tcf_result { |
db50514f JP |
204 | union { |
205 | struct { | |
206 | unsigned long class; | |
207 | u32 classid; | |
208 | }; | |
209 | const struct tcf_proto *goto_tp; | |
210 | }; | |
1da177e4 LT |
211 | }; |
212 | ||
fd2c3ef7 | 213 | struct tcf_proto_ops { |
36272874 | 214 | struct list_head head; |
1da177e4 LT |
215 | char kind[IFNAMSIZ]; |
216 | ||
dc7f9f6e ED |
217 | int (*classify)(struct sk_buff *, |
218 | const struct tcf_proto *, | |
219 | struct tcf_result *); | |
1da177e4 | 220 | int (*init)(struct tcf_proto*); |
763dbf63 | 221 | void (*destroy)(struct tcf_proto*); |
1da177e4 | 222 | |
8113c095 | 223 | void* (*get)(struct tcf_proto*, u32 handle); |
c1b52739 | 224 | int (*change)(struct net *net, struct sk_buff *, |
af4c6641 | 225 | struct tcf_proto*, unsigned long, |
add93b61 | 226 | u32 handle, struct nlattr **, |
8113c095 WC |
227 | void **, bool); |
228 | int (*delete)(struct tcf_proto*, void *, bool*); | |
1da177e4 | 229 | void (*walk)(struct tcf_proto*, struct tcf_walker *arg); |
07d79fc7 | 230 | void (*bind_class)(void *, u32, unsigned long); |
1da177e4 LT |
231 | |
232 | /* rtnetlink specific */ | |
8113c095 | 233 | int (*dump)(struct net*, struct tcf_proto*, void *, |
1da177e4 LT |
234 | struct sk_buff *skb, struct tcmsg*); |
235 | ||
236 | struct module *owner; | |
237 | }; | |
238 | ||
fd2c3ef7 | 239 | struct tcf_proto { |
1da177e4 | 240 | /* Fast access part */ |
25d8c0d5 JF |
241 | struct tcf_proto __rcu *next; |
242 | void __rcu *root; | |
dc7f9f6e ED |
243 | int (*classify)(struct sk_buff *, |
244 | const struct tcf_proto *, | |
245 | struct tcf_result *); | |
66c6f529 | 246 | __be16 protocol; |
1da177e4 LT |
247 | |
248 | /* All the rest */ | |
249 | u32 prio; | |
250 | u32 classid; | |
251 | struct Qdisc *q; | |
252 | void *data; | |
dc7f9f6e | 253 | const struct tcf_proto_ops *ops; |
5bc17018 | 254 | struct tcf_chain *chain; |
25d8c0d5 | 255 | struct rcu_head rcu; |
1da177e4 LT |
256 | }; |
257 | ||
175f9c1b JK |
258 | struct qdisc_skb_cb { |
259 | unsigned int pkt_len; | |
df4ab5b3 | 260 | u16 slave_dev_queue_mapping; |
045efa82 | 261 | u16 tc_classid; |
25711786 ED |
262 | #define QDISC_CB_PRIV_LEN 20 |
263 | unsigned char data[QDISC_CB_PRIV_LEN]; | |
175f9c1b JK |
264 | }; |
265 | ||
c7eb7d72 JP |
266 | typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv); |
267 | ||
2190d1d0 JP |
268 | struct tcf_chain { |
269 | struct tcf_proto __rcu *filter_chain; | |
c7eb7d72 JP |
270 | tcf_chain_head_change_t *chain_head_change; |
271 | void *chain_head_change_priv; | |
5bc17018 JP |
272 | struct list_head list; |
273 | struct tcf_block *block; | |
274 | u32 index; /* chain index */ | |
275 | unsigned int refcnt; | |
6529eaba JP |
276 | }; |
277 | ||
2190d1d0 | 278 | struct tcf_block { |
5bc17018 | 279 | struct list_head chain_list; |
855319be | 280 | struct net *net; |
69d78ef2 | 281 | struct Qdisc *q; |
acb67442 | 282 | struct list_head cb_list; |
2190d1d0 JP |
283 | }; |
284 | ||
16bda13d DM |
285 | static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
286 | { | |
287 | struct qdisc_skb_cb *qcb; | |
5ee31c68 ED |
288 | |
289 | BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); | |
16bda13d DM |
290 | BUILD_BUG_ON(sizeof(qcb->data) < sz); |
291 | } | |
292 | ||
05bdd2f1 | 293 | static inline int qdisc_qlen(const struct Qdisc *q) |
bbd8a0d3 KK |
294 | { |
295 | return q->q.qlen; | |
296 | } | |
297 | ||
bfe0d029 | 298 | static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
175f9c1b JK |
299 | { |
300 | return (struct qdisc_skb_cb *)skb->cb; | |
301 | } | |
302 | ||
83874000 DM |
303 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
304 | { | |
305 | return &qdisc->q.lock; | |
306 | } | |
307 | ||
05bdd2f1 | 308 | static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
7698b4fc | 309 | { |
46e5da40 JF |
310 | struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
311 | ||
312 | return q; | |
7698b4fc DM |
313 | } |
314 | ||
05bdd2f1 | 315 | static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
2540e051 JP |
316 | { |
317 | return qdisc->dev_queue->qdisc_sleeping; | |
318 | } | |
319 | ||
7e43f112 DM |
320 | /* The qdisc root lock is a mechanism by which to top level |
321 | * of a qdisc tree can be locked from any qdisc node in the | |
322 | * forest. This allows changing the configuration of some | |
323 | * aspect of the qdisc tree while blocking out asynchronous | |
324 | * qdisc access in the packet processing paths. | |
325 | * | |
326 | * It is only legal to do this when the root will not change | |
327 | * on us. Otherwise we'll potentially lock the wrong qdisc | |
328 | * root. This is enforced by holding the RTNL semaphore, which | |
329 | * all users of this lock accessor must do. | |
330 | */ | |
05bdd2f1 | 331 | static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) |
7698b4fc DM |
332 | { |
333 | struct Qdisc *root = qdisc_root(qdisc); | |
334 | ||
7e43f112 | 335 | ASSERT_RTNL(); |
83874000 | 336 | return qdisc_lock(root); |
7698b4fc DM |
337 | } |
338 | ||
05bdd2f1 | 339 | static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
f6f9b93f JP |
340 | { |
341 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
342 | ||
343 | ASSERT_RTNL(); | |
344 | return qdisc_lock(root); | |
345 | } | |
346 | ||
edb09eb1 ED |
347 | static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) |
348 | { | |
349 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
350 | ||
351 | ASSERT_RTNL(); | |
352 | return &root->running; | |
353 | } | |
354 | ||
05bdd2f1 | 355 | static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) |
5ce2d488 DM |
356 | { |
357 | return qdisc->dev_queue->dev; | |
358 | } | |
1da177e4 | 359 | |
05bdd2f1 | 360 | static inline void sch_tree_lock(const struct Qdisc *q) |
78a5b30b | 361 | { |
fe439dd0 | 362 | spin_lock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
363 | } |
364 | ||
05bdd2f1 | 365 | static inline void sch_tree_unlock(const struct Qdisc *q) |
78a5b30b | 366 | { |
fe439dd0 | 367 | spin_unlock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
368 | } |
369 | ||
e41a33e6 TG |
370 | extern struct Qdisc noop_qdisc; |
371 | extern struct Qdisc_ops noop_qdisc_ops; | |
6ec1c69a DM |
372 | extern struct Qdisc_ops pfifo_fast_ops; |
373 | extern struct Qdisc_ops mq_qdisc_ops; | |
d66d6c31 | 374 | extern struct Qdisc_ops noqueue_qdisc_ops; |
6da7c8fc | 375 | extern const struct Qdisc_ops *default_qdisc_ops; |
1f27cde3 ED |
376 | static inline const struct Qdisc_ops * |
377 | get_default_qdisc_ops(const struct net_device *dev, int ntx) | |
378 | { | |
379 | return ntx < dev->real_num_tx_queues ? | |
380 | default_qdisc_ops : &pfifo_fast_ops; | |
381 | } | |
e41a33e6 | 382 | |
fd2c3ef7 | 383 | struct Qdisc_class_common { |
6fe1c7a5 PM |
384 | u32 classid; |
385 | struct hlist_node hnode; | |
386 | }; | |
387 | ||
fd2c3ef7 | 388 | struct Qdisc_class_hash { |
6fe1c7a5 PM |
389 | struct hlist_head *hash; |
390 | unsigned int hashsize; | |
391 | unsigned int hashmask; | |
392 | unsigned int hashelems; | |
393 | }; | |
394 | ||
395 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
396 | { | |
397 | id ^= id >> 8; | |
398 | id ^= id >> 4; | |
399 | return id & mask; | |
400 | } | |
401 | ||
402 | static inline struct Qdisc_class_common * | |
05bdd2f1 | 403 | qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
6fe1c7a5 PM |
404 | { |
405 | struct Qdisc_class_common *cl; | |
6fe1c7a5 PM |
406 | unsigned int h; |
407 | ||
7d3f0cd4 GF |
408 | if (!id) |
409 | return NULL; | |
410 | ||
6fe1c7a5 | 411 | h = qdisc_class_hash(id, hash->hashmask); |
b67bfe0d | 412 | hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
6fe1c7a5 PM |
413 | if (cl->classid == id) |
414 | return cl; | |
415 | } | |
416 | return NULL; | |
417 | } | |
418 | ||
384c181e AN |
419 | static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) |
420 | { | |
421 | u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; | |
422 | ||
423 | return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; | |
424 | } | |
425 | ||
5c15257f JP |
426 | int qdisc_class_hash_init(struct Qdisc_class_hash *); |
427 | void qdisc_class_hash_insert(struct Qdisc_class_hash *, | |
428 | struct Qdisc_class_common *); | |
429 | void qdisc_class_hash_remove(struct Qdisc_class_hash *, | |
430 | struct Qdisc_class_common *); | |
431 | void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
432 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
433 | ||
434 | void dev_init_scheduler(struct net_device *dev); | |
435 | void dev_shutdown(struct net_device *dev); | |
436 | void dev_activate(struct net_device *dev); | |
437 | void dev_deactivate(struct net_device *dev); | |
438 | void dev_deactivate_many(struct list_head *head); | |
439 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
440 | struct Qdisc *qdisc); | |
441 | void qdisc_reset(struct Qdisc *qdisc); | |
442 | void qdisc_destroy(struct Qdisc *qdisc); | |
2ccccf5f WC |
443 | void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n, |
444 | unsigned int len); | |
5c15257f | 445 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d2a7f269 | 446 | const struct Qdisc_ops *ops); |
5c15257f | 447 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 448 | const struct Qdisc_ops *ops, u32 parentid); |
5c15257f JP |
449 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
450 | const struct qdisc_size_table *stab); | |
27b29f63 | 451 | int skb_do_redirect(struct sk_buff *); |
1da177e4 | 452 | |
a5135bcf WB |
453 | static inline void skb_reset_tc(struct sk_buff *skb) |
454 | { | |
455 | #ifdef CONFIG_NET_CLS_ACT | |
bc31c905 | 456 | skb->tc_redirected = 0; |
a5135bcf WB |
457 | #endif |
458 | } | |
459 | ||
fdc5432a DB |
460 | static inline bool skb_at_tc_ingress(const struct sk_buff *skb) |
461 | { | |
462 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 463 | return skb->tc_at_ingress; |
fdc5432a DB |
464 | #else |
465 | return false; | |
466 | #endif | |
467 | } | |
468 | ||
e7246e12 WB |
469 | static inline bool skb_skip_tc_classify(struct sk_buff *skb) |
470 | { | |
471 | #ifdef CONFIG_NET_CLS_ACT | |
472 | if (skb->tc_skip_classify) { | |
473 | skb->tc_skip_classify = 0; | |
474 | return true; | |
475 | } | |
476 | #endif | |
477 | return false; | |
478 | } | |
479 | ||
f0796d5c JF |
480 | /* Reset all TX qdiscs greater then index of a device. */ |
481 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) | |
5aa70995 | 482 | { |
4ef6acff JF |
483 | struct Qdisc *qdisc; |
484 | ||
f0796d5c | 485 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 486 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
487 | if (qdisc) { |
488 | spin_lock_bh(qdisc_lock(qdisc)); | |
489 | qdisc_reset(qdisc); | |
490 | spin_unlock_bh(qdisc_lock(qdisc)); | |
491 | } | |
492 | } | |
5aa70995 DM |
493 | } |
494 | ||
5aa70995 DM |
495 | static inline void qdisc_reset_all_tx(struct net_device *dev) |
496 | { | |
f0796d5c | 497 | qdisc_reset_all_tx_gt(dev, 0); |
5aa70995 DM |
498 | } |
499 | ||
3e745dd6 DM |
500 | /* Are all TX queues of the device empty? */ |
501 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
502 | { | |
e8a0464c | 503 | unsigned int i; |
46e5da40 JF |
504 | |
505 | rcu_read_lock(); | |
e8a0464c DM |
506 | for (i = 0; i < dev->num_tx_queues; i++) { |
507 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 508 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 509 | |
46e5da40 JF |
510 | if (q->q.qlen) { |
511 | rcu_read_unlock(); | |
e8a0464c | 512 | return false; |
46e5da40 | 513 | } |
e8a0464c | 514 | } |
46e5da40 | 515 | rcu_read_unlock(); |
e8a0464c | 516 | return true; |
3e745dd6 DM |
517 | } |
518 | ||
6fa9864b | 519 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 520 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 521 | { |
e8a0464c | 522 | unsigned int i; |
46e5da40 | 523 | |
e8a0464c DM |
524 | for (i = 0; i < dev->num_tx_queues; i++) { |
525 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 526 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
527 | return true; |
528 | } | |
529 | return false; | |
6fa9864b DM |
530 | } |
531 | ||
e8a0464c | 532 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
533 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
534 | { | |
e8a0464c | 535 | unsigned int i; |
46e5da40 | 536 | |
e8a0464c DM |
537 | for (i = 0; i < dev->num_tx_queues; i++) { |
538 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 539 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
e8a0464c DM |
540 | return false; |
541 | } | |
542 | return true; | |
05297949 DM |
543 | } |
544 | ||
bfe0d029 | 545 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 546 | { |
175f9c1b | 547 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
548 | } |
549 | ||
c27f339a | 550 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
551 | enum net_xmit_qdisc_t { |
552 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 553 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
554 | }; |
555 | ||
c27f339a | 556 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 557 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
558 | #else |
559 | #define net_xmit_drop_count(e) (1) | |
560 | #endif | |
561 | ||
a2da570d ED |
562 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
563 | const struct Qdisc *sch) | |
5f86173b | 564 | { |
3a682fbd | 565 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
566 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
567 | ||
568 | if (stab) | |
569 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 570 | #endif |
a2da570d ED |
571 | } |
572 | ||
520ac30f ED |
573 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
574 | struct sk_buff **to_free) | |
a2da570d ED |
575 | { |
576 | qdisc_calculate_pkt_len(skb, sch); | |
520ac30f | 577 | return sch->enqueue(skb, sch, to_free); |
5f86173b JK |
578 | } |
579 | ||
22e0f8b9 JF |
580 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
581 | { | |
582 | return q->flags & TCQ_F_CPUSTATS; | |
583 | } | |
bfe0d029 | 584 | |
38040702 AV |
585 | static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, |
586 | __u64 bytes, __u32 packets) | |
587 | { | |
588 | bstats->bytes += bytes; | |
589 | bstats->packets += packets; | |
590 | } | |
591 | ||
bfe0d029 ED |
592 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, |
593 | const struct sk_buff *skb) | |
594 | { | |
38040702 AV |
595 | _bstats_update(bstats, |
596 | qdisc_pkt_len(skb), | |
597 | skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); | |
598 | } | |
599 | ||
600 | static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, | |
601 | __u64 bytes, __u32 packets) | |
602 | { | |
603 | u64_stats_update_begin(&bstats->syncp); | |
604 | _bstats_update(&bstats->bstats, bytes, packets); | |
605 | u64_stats_update_end(&bstats->syncp); | |
bfe0d029 ED |
606 | } |
607 | ||
24ea591d ED |
608 | static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, |
609 | const struct sk_buff *skb) | |
22e0f8b9 | 610 | { |
22e0f8b9 JF |
611 | u64_stats_update_begin(&bstats->syncp); |
612 | bstats_update(&bstats->bstats, skb); | |
613 | u64_stats_update_end(&bstats->syncp); | |
614 | } | |
615 | ||
24ea591d ED |
616 | static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
617 | const struct sk_buff *skb) | |
618 | { | |
619 | bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); | |
620 | } | |
621 | ||
bfe0d029 ED |
622 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
623 | const struct sk_buff *skb) | |
bbd8a0d3 | 624 | { |
bfe0d029 | 625 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
626 | } |
627 | ||
25331d6c JF |
628 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
629 | const struct sk_buff *skb) | |
630 | { | |
631 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
632 | } | |
633 | ||
634 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, | |
635 | const struct sk_buff *skb) | |
636 | { | |
637 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
638 | } | |
639 | ||
640 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) | |
641 | { | |
642 | sch->qstats.drops += count; | |
643 | } | |
644 | ||
24ea591d | 645 | static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
25331d6c | 646 | { |
24ea591d | 647 | qstats->drops++; |
25331d6c JF |
648 | } |
649 | ||
24ea591d | 650 | static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
b0ab6f92 | 651 | { |
24ea591d ED |
652 | qstats->overlimits++; |
653 | } | |
b0ab6f92 | 654 | |
24ea591d ED |
655 | static inline void qdisc_qstats_drop(struct Qdisc *sch) |
656 | { | |
657 | qstats_drop_inc(&sch->qstats); | |
658 | } | |
659 | ||
660 | static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) | |
661 | { | |
eb60a8dd | 662 | this_cpu_inc(sch->cpu_qstats->drops); |
b0ab6f92 JF |
663 | } |
664 | ||
25331d6c JF |
665 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
666 | { | |
667 | sch->qstats.overlimits++; | |
668 | } | |
669 | ||
48da34b7 FW |
670 | static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh) |
671 | { | |
672 | qh->head = NULL; | |
673 | qh->tail = NULL; | |
674 | qh->qlen = 0; | |
675 | } | |
676 | ||
9972b25d | 677 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
48da34b7 | 678 | struct qdisc_skb_head *qh) |
9972b25d | 679 | { |
48da34b7 FW |
680 | struct sk_buff *last = qh->tail; |
681 | ||
682 | if (last) { | |
683 | skb->next = NULL; | |
684 | last->next = skb; | |
685 | qh->tail = skb; | |
686 | } else { | |
687 | qh->tail = skb; | |
688 | qh->head = skb; | |
689 | } | |
690 | qh->qlen++; | |
25331d6c | 691 | qdisc_qstats_backlog_inc(sch, skb); |
9972b25d TG |
692 | |
693 | return NET_XMIT_SUCCESS; | |
694 | } | |
695 | ||
696 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
697 | { | |
698 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
699 | } | |
700 | ||
48da34b7 | 701 | static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) |
9972b25d | 702 | { |
48da34b7 FW |
703 | struct sk_buff *skb = qh->head; |
704 | ||
705 | if (likely(skb != NULL)) { | |
706 | qh->head = skb->next; | |
707 | qh->qlen--; | |
708 | if (qh->head == NULL) | |
709 | qh->tail = NULL; | |
710 | skb->next = NULL; | |
711 | } | |
9972b25d | 712 | |
ec323368 FW |
713 | return skb; |
714 | } | |
715 | ||
716 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
717 | { | |
718 | struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); | |
719 | ||
9190b3b3 | 720 | if (likely(skb != NULL)) { |
25331d6c | 721 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
722 | qdisc_bstats_update(sch, skb); |
723 | } | |
9972b25d TG |
724 | |
725 | return skb; | |
726 | } | |
727 | ||
520ac30f ED |
728 | /* Instead of calling kfree_skb() while root qdisc lock is held, |
729 | * queue the skb for future freeing at end of __dev_xmit_skb() | |
730 | */ | |
731 | static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) | |
732 | { | |
733 | skb->next = *to_free; | |
734 | *to_free = skb; | |
735 | } | |
736 | ||
57dbb2d8 | 737 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, |
48da34b7 | 738 | struct qdisc_skb_head *qh, |
520ac30f | 739 | struct sk_buff **to_free) |
57dbb2d8 | 740 | { |
48da34b7 | 741 | struct sk_buff *skb = __qdisc_dequeue_head(qh); |
57dbb2d8 HPP |
742 | |
743 | if (likely(skb != NULL)) { | |
744 | unsigned int len = qdisc_pkt_len(skb); | |
520ac30f | 745 | |
25331d6c | 746 | qdisc_qstats_backlog_dec(sch, skb); |
520ac30f | 747 | __qdisc_drop(skb, to_free); |
57dbb2d8 HPP |
748 | return len; |
749 | } | |
750 | ||
751 | return 0; | |
752 | } | |
753 | ||
520ac30f ED |
754 | static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch, |
755 | struct sk_buff **to_free) | |
57dbb2d8 | 756 | { |
520ac30f | 757 | return __qdisc_queue_drop_head(sch, &sch->q, to_free); |
9972b25d TG |
758 | } |
759 | ||
48a8f519 PM |
760 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
761 | { | |
48da34b7 FW |
762 | const struct qdisc_skb_head *qh = &sch->q; |
763 | ||
764 | return qh->head; | |
48a8f519 PM |
765 | } |
766 | ||
77be155c JP |
767 | /* generic pseudo peek method for non-work-conserving qdisc */ |
768 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
769 | { | |
770 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ | |
61c9eaf9 | 771 | if (!sch->gso_skb) { |
77be155c | 772 | sch->gso_skb = sch->dequeue(sch); |
a27758ff | 773 | if (sch->gso_skb) { |
61c9eaf9 | 774 | /* it's still part of the queue */ |
a27758ff | 775 | qdisc_qstats_backlog_inc(sch, sch->gso_skb); |
61c9eaf9 | 776 | sch->q.qlen++; |
a27758ff | 777 | } |
61c9eaf9 | 778 | } |
77be155c JP |
779 | |
780 | return sch->gso_skb; | |
781 | } | |
782 | ||
783 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
784 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
785 | { | |
786 | struct sk_buff *skb = sch->gso_skb; | |
787 | ||
61c9eaf9 | 788 | if (skb) { |
77be155c | 789 | sch->gso_skb = NULL; |
a27758ff | 790 | qdisc_qstats_backlog_dec(sch, skb); |
61c9eaf9 JP |
791 | sch->q.qlen--; |
792 | } else { | |
77be155c | 793 | skb = sch->dequeue(sch); |
61c9eaf9 | 794 | } |
77be155c JP |
795 | |
796 | return skb; | |
797 | } | |
798 | ||
48da34b7 | 799 | static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) |
9972b25d TG |
800 | { |
801 | /* | |
802 | * We do not know the backlog in bytes of this list, it | |
803 | * is up to the caller to correct it | |
804 | */ | |
48da34b7 FW |
805 | ASSERT_RTNL(); |
806 | if (qh->qlen) { | |
807 | rtnl_kfree_skbs(qh->head, qh->tail); | |
808 | ||
809 | qh->head = NULL; | |
810 | qh->tail = NULL; | |
811 | qh->qlen = 0; | |
1b5c5493 | 812 | } |
9972b25d TG |
813 | } |
814 | ||
815 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
816 | { | |
1b5c5493 | 817 | __qdisc_reset_queue(&sch->q); |
9972b25d TG |
818 | sch->qstats.backlog = 0; |
819 | } | |
820 | ||
86a7996c WC |
821 | static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, |
822 | struct Qdisc **pold) | |
823 | { | |
824 | struct Qdisc *old; | |
825 | ||
826 | sch_tree_lock(sch); | |
827 | old = *pold; | |
828 | *pold = new; | |
829 | if (old != NULL) { | |
68a66d14 KK |
830 | unsigned int qlen = old->q.qlen; |
831 | unsigned int backlog = old->qstats.backlog; | |
832 | ||
86a7996c | 833 | qdisc_reset(old); |
68a66d14 | 834 | qdisc_tree_reduce_backlog(old, qlen, backlog); |
86a7996c WC |
835 | } |
836 | sch_tree_unlock(sch); | |
837 | ||
838 | return old; | |
839 | } | |
840 | ||
1b5c5493 ED |
841 | static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) |
842 | { | |
843 | rtnl_kfree_skbs(skb, skb); | |
844 | qdisc_qstats_drop(sch); | |
845 | } | |
846 | ||
520ac30f ED |
847 | |
848 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, | |
849 | struct sk_buff **to_free) | |
9972b25d | 850 | { |
520ac30f | 851 | __qdisc_drop(skb, to_free); |
25331d6c | 852 | qdisc_qstats_drop(sch); |
9972b25d TG |
853 | |
854 | return NET_XMIT_DROP; | |
855 | } | |
856 | ||
e9bef55d JDB |
857 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
858 | long it will take to send a packet given its size. | |
859 | */ | |
860 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
861 | { | |
e08b0998 JDB |
862 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
863 | if (slot < 0) | |
864 | slot = 0; | |
e9bef55d JDB |
865 | slot >>= rtab->rate.cell_log; |
866 | if (slot > 255) | |
a02cec21 | 867 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
868 | return rtab->data[slot]; |
869 | } | |
870 | ||
292f1c7f | 871 | struct psched_ratecfg { |
130d3d68 | 872 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
873 | u32 mult; |
874 | u16 overhead; | |
8a8e3d84 | 875 | u8 linklayer; |
01cb71d2 | 876 | u8 shift; |
292f1c7f JP |
877 | }; |
878 | ||
879 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
880 | unsigned int len) | |
881 | { | |
8a8e3d84 JDB |
882 | len += r->overhead; |
883 | ||
884 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
885 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
886 | ||
887 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
888 | } |
889 | ||
5c15257f | 890 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
891 | const struct tc_ratespec *conf, |
892 | u64 rate64); | |
292f1c7f | 893 | |
01cb71d2 ED |
894 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
895 | const struct psched_ratecfg *r) | |
292f1c7f | 896 | { |
01cb71d2 | 897 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
898 | |
899 | /* legacy struct tc_ratespec has a 32bit @rate field | |
900 | * Qdisc using 64bit rate should add new attributes | |
901 | * in order to maintain compatibility. | |
902 | */ | |
903 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
904 | ||
01cb71d2 | 905 | res->overhead = r->overhead; |
8a8e3d84 | 906 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
907 | } |
908 | ||
46209401 JP |
909 | /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. |
910 | * The fast path only needs to access filter list and to update stats | |
911 | */ | |
912 | struct mini_Qdisc { | |
913 | struct tcf_proto *filter_list; | |
914 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; | |
915 | struct gnet_stats_queue __percpu *cpu_qstats; | |
916 | struct rcu_head rcu; | |
917 | }; | |
918 | ||
919 | static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, | |
920 | const struct sk_buff *skb) | |
921 | { | |
922 | bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb); | |
923 | } | |
924 | ||
925 | static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) | |
926 | { | |
927 | this_cpu_inc(miniq->cpu_qstats->drops); | |
928 | } | |
929 | ||
930 | struct mini_Qdisc_pair { | |
931 | struct mini_Qdisc miniq1; | |
932 | struct mini_Qdisc miniq2; | |
933 | struct mini_Qdisc __rcu **p_miniq; | |
934 | }; | |
935 | ||
936 | void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, | |
937 | struct tcf_proto *tp_head); | |
938 | void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, | |
939 | struct mini_Qdisc __rcu **p_miniq); | |
940 | ||
1da177e4 | 941 | #endif |