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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 */ |
7a4fa291 | 74 | #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */ |
45203a3b | 75 | u32 limit; |
05bdd2f1 | 76 | const struct Qdisc_ops *ops; |
a2da570d | 77 | struct qdisc_size_table __rcu *stab; |
59cc1f61 | 78 | struct hlist_node hash; |
1da177e4 LT |
79 | u32 handle; |
80 | u32 parent; | |
72b25a91 | 81 | |
5e140dfc | 82 | struct netdev_queue *dev_queue; |
5e140dfc | 83 | |
1c0d32fd | 84 | struct net_rate_estimator __rcu *rate_est; |
0d32ef8c ED |
85 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; |
86 | struct gnet_stats_queue __percpu *cpu_qstats; | |
87 | ||
5e140dfc ED |
88 | /* |
89 | * For performance sake on SMP, we put highly modified fields at the end | |
90 | */ | |
4d202a0d | 91 | struct sk_buff *gso_skb ____cacheline_aligned_in_smp; |
48da34b7 | 92 | struct qdisc_skb_head q; |
0d32ef8c | 93 | struct gnet_stats_basic_packed bstats; |
f9eb8aea | 94 | seqcount_t running; |
0d32ef8c | 95 | struct gnet_stats_queue qstats; |
4d202a0d ED |
96 | unsigned long state; |
97 | struct Qdisc *next_sched; | |
98 | struct sk_buff *skb_bad_txq; | |
45203a3b | 99 | int padded; |
7b936405 | 100 | refcount_t refcnt; |
45203a3b ED |
101 | |
102 | spinlock_t busylock ____cacheline_aligned_in_smp; | |
1da177e4 LT |
103 | }; |
104 | ||
551143d8 ED |
105 | static inline void qdisc_refcount_inc(struct Qdisc *qdisc) |
106 | { | |
107 | if (qdisc->flags & TCQ_F_BUILTIN) | |
108 | return; | |
109 | refcount_inc(&qdisc->refcnt); | |
110 | } | |
111 | ||
fd245a4a | 112 | static inline bool qdisc_is_running(const struct Qdisc *qdisc) |
bc135b23 | 113 | { |
f9eb8aea | 114 | return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; |
bc135b23 ED |
115 | } |
116 | ||
117 | static inline bool qdisc_run_begin(struct Qdisc *qdisc) | |
118 | { | |
fd245a4a ED |
119 | if (qdisc_is_running(qdisc)) |
120 | return false; | |
52fbb290 ED |
121 | /* Variant of write_seqcount_begin() telling lockdep a trylock |
122 | * was attempted. | |
123 | */ | |
124 | raw_write_seqcount_begin(&qdisc->running); | |
125 | seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_); | |
fd245a4a | 126 | return true; |
bc135b23 ED |
127 | } |
128 | ||
129 | static inline void qdisc_run_end(struct Qdisc *qdisc) | |
130 | { | |
f9eb8aea | 131 | write_seqcount_end(&qdisc->running); |
fd245a4a ED |
132 | } |
133 | ||
5772e9a3 JDB |
134 | static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) |
135 | { | |
136 | return qdisc->flags & TCQ_F_ONETXQUEUE; | |
137 | } | |
138 | ||
139 | static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) | |
140 | { | |
141 | #ifdef CONFIG_BQL | |
142 | /* Non-BQL migrated drivers will return 0, too. */ | |
143 | return dql_avail(&txq->dql); | |
144 | #else | |
145 | return 0; | |
146 | #endif | |
147 | } | |
148 | ||
fd2c3ef7 | 149 | struct Qdisc_class_ops { |
1da177e4 | 150 | /* Child qdisc manipulation */ |
926e61b7 | 151 | struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); |
1da177e4 LT |
152 | int (*graft)(struct Qdisc *, unsigned long cl, |
153 | struct Qdisc *, struct Qdisc **); | |
154 | struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); | |
43effa1e | 155 | void (*qlen_notify)(struct Qdisc *, unsigned long); |
1da177e4 LT |
156 | |
157 | /* Class manipulation routines */ | |
143976ce | 158 | unsigned long (*find)(struct Qdisc *, u32 classid); |
1da177e4 | 159 | int (*change)(struct Qdisc *, u32, u32, |
1e90474c | 160 | struct nlattr **, unsigned long *); |
1da177e4 LT |
161 | int (*delete)(struct Qdisc *, unsigned long); |
162 | void (*walk)(struct Qdisc *, struct qdisc_walker * arg); | |
163 | ||
164 | /* Filter manipulation */ | |
6529eaba | 165 | struct tcf_block * (*tcf_block)(struct Qdisc *, unsigned long); |
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; | |
81d947e2 | 182 | unsigned int static_flags; |
1da177e4 | 183 | |
520ac30f ED |
184 | int (*enqueue)(struct sk_buff *skb, |
185 | struct Qdisc *sch, | |
186 | struct sk_buff **to_free); | |
1da177e4 | 187 | struct sk_buff * (*dequeue)(struct Qdisc *); |
90d841fd | 188 | struct sk_buff * (*peek)(struct Qdisc *); |
1da177e4 | 189 | |
1e90474c | 190 | int (*init)(struct Qdisc *, struct nlattr *arg); |
1da177e4 LT |
191 | void (*reset)(struct Qdisc *); |
192 | void (*destroy)(struct Qdisc *); | |
1e90474c | 193 | int (*change)(struct Qdisc *, struct nlattr *arg); |
6ec1c69a | 194 | void (*attach)(struct Qdisc *); |
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); |
81d947e2 | 447 | void qdisc_free(struct Qdisc *qdisc); |
5c15257f | 448 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 449 | const struct Qdisc_ops *ops, u32 parentid); |
5c15257f JP |
450 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
451 | const struct qdisc_size_table *stab); | |
27b29f63 | 452 | int skb_do_redirect(struct sk_buff *); |
1da177e4 | 453 | |
a5135bcf WB |
454 | static inline void skb_reset_tc(struct sk_buff *skb) |
455 | { | |
456 | #ifdef CONFIG_NET_CLS_ACT | |
bc31c905 | 457 | skb->tc_redirected = 0; |
a5135bcf WB |
458 | #endif |
459 | } | |
460 | ||
fdc5432a DB |
461 | static inline bool skb_at_tc_ingress(const struct sk_buff *skb) |
462 | { | |
463 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 464 | return skb->tc_at_ingress; |
fdc5432a DB |
465 | #else |
466 | return false; | |
467 | #endif | |
468 | } | |
469 | ||
e7246e12 WB |
470 | static inline bool skb_skip_tc_classify(struct sk_buff *skb) |
471 | { | |
472 | #ifdef CONFIG_NET_CLS_ACT | |
473 | if (skb->tc_skip_classify) { | |
474 | skb->tc_skip_classify = 0; | |
475 | return true; | |
476 | } | |
477 | #endif | |
478 | return false; | |
479 | } | |
480 | ||
f0796d5c JF |
481 | /* Reset all TX qdiscs greater then index of a device. */ |
482 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) | |
5aa70995 | 483 | { |
4ef6acff JF |
484 | struct Qdisc *qdisc; |
485 | ||
f0796d5c | 486 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 487 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
488 | if (qdisc) { |
489 | spin_lock_bh(qdisc_lock(qdisc)); | |
490 | qdisc_reset(qdisc); | |
491 | spin_unlock_bh(qdisc_lock(qdisc)); | |
492 | } | |
493 | } | |
5aa70995 DM |
494 | } |
495 | ||
5aa70995 DM |
496 | static inline void qdisc_reset_all_tx(struct net_device *dev) |
497 | { | |
f0796d5c | 498 | qdisc_reset_all_tx_gt(dev, 0); |
5aa70995 DM |
499 | } |
500 | ||
3e745dd6 DM |
501 | /* Are all TX queues of the device empty? */ |
502 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
503 | { | |
e8a0464c | 504 | unsigned int i; |
46e5da40 JF |
505 | |
506 | rcu_read_lock(); | |
e8a0464c DM |
507 | for (i = 0; i < dev->num_tx_queues; i++) { |
508 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 509 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 510 | |
46e5da40 JF |
511 | if (q->q.qlen) { |
512 | rcu_read_unlock(); | |
e8a0464c | 513 | return false; |
46e5da40 | 514 | } |
e8a0464c | 515 | } |
46e5da40 | 516 | rcu_read_unlock(); |
e8a0464c | 517 | return true; |
3e745dd6 DM |
518 | } |
519 | ||
6fa9864b | 520 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 521 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 522 | { |
e8a0464c | 523 | unsigned int i; |
46e5da40 | 524 | |
e8a0464c DM |
525 | for (i = 0; i < dev->num_tx_queues; i++) { |
526 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 527 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
528 | return true; |
529 | } | |
530 | return false; | |
6fa9864b DM |
531 | } |
532 | ||
e8a0464c | 533 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
534 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
535 | { | |
e8a0464c | 536 | unsigned int i; |
46e5da40 | 537 | |
e8a0464c DM |
538 | for (i = 0; i < dev->num_tx_queues; i++) { |
539 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 540 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
e8a0464c DM |
541 | return false; |
542 | } | |
543 | return true; | |
05297949 DM |
544 | } |
545 | ||
bfe0d029 | 546 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 547 | { |
175f9c1b | 548 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
549 | } |
550 | ||
c27f339a | 551 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
552 | enum net_xmit_qdisc_t { |
553 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 554 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
555 | }; |
556 | ||
c27f339a | 557 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 558 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
559 | #else |
560 | #define net_xmit_drop_count(e) (1) | |
561 | #endif | |
562 | ||
a2da570d ED |
563 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
564 | const struct Qdisc *sch) | |
5f86173b | 565 | { |
3a682fbd | 566 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
567 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
568 | ||
569 | if (stab) | |
570 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 571 | #endif |
a2da570d ED |
572 | } |
573 | ||
520ac30f ED |
574 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
575 | struct sk_buff **to_free) | |
a2da570d ED |
576 | { |
577 | qdisc_calculate_pkt_len(skb, sch); | |
520ac30f | 578 | return sch->enqueue(skb, sch, to_free); |
5f86173b JK |
579 | } |
580 | ||
22e0f8b9 JF |
581 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
582 | { | |
583 | return q->flags & TCQ_F_CPUSTATS; | |
584 | } | |
bfe0d029 | 585 | |
38040702 AV |
586 | static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, |
587 | __u64 bytes, __u32 packets) | |
588 | { | |
589 | bstats->bytes += bytes; | |
590 | bstats->packets += packets; | |
591 | } | |
592 | ||
bfe0d029 ED |
593 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, |
594 | const struct sk_buff *skb) | |
595 | { | |
38040702 AV |
596 | _bstats_update(bstats, |
597 | qdisc_pkt_len(skb), | |
598 | skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); | |
599 | } | |
600 | ||
601 | static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, | |
602 | __u64 bytes, __u32 packets) | |
603 | { | |
604 | u64_stats_update_begin(&bstats->syncp); | |
605 | _bstats_update(&bstats->bstats, bytes, packets); | |
606 | u64_stats_update_end(&bstats->syncp); | |
bfe0d029 ED |
607 | } |
608 | ||
24ea591d ED |
609 | static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, |
610 | const struct sk_buff *skb) | |
22e0f8b9 | 611 | { |
22e0f8b9 JF |
612 | u64_stats_update_begin(&bstats->syncp); |
613 | bstats_update(&bstats->bstats, skb); | |
614 | u64_stats_update_end(&bstats->syncp); | |
615 | } | |
616 | ||
24ea591d ED |
617 | static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
618 | const struct sk_buff *skb) | |
619 | { | |
620 | bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); | |
621 | } | |
622 | ||
bfe0d029 ED |
623 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
624 | const struct sk_buff *skb) | |
bbd8a0d3 | 625 | { |
bfe0d029 | 626 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
627 | } |
628 | ||
25331d6c JF |
629 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
630 | const struct sk_buff *skb) | |
631 | { | |
632 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
633 | } | |
634 | ||
635 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, | |
636 | const struct sk_buff *skb) | |
637 | { | |
638 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
639 | } | |
640 | ||
641 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) | |
642 | { | |
643 | sch->qstats.drops += count; | |
644 | } | |
645 | ||
24ea591d | 646 | static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
25331d6c | 647 | { |
24ea591d | 648 | qstats->drops++; |
25331d6c JF |
649 | } |
650 | ||
24ea591d | 651 | static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
b0ab6f92 | 652 | { |
24ea591d ED |
653 | qstats->overlimits++; |
654 | } | |
b0ab6f92 | 655 | |
24ea591d ED |
656 | static inline void qdisc_qstats_drop(struct Qdisc *sch) |
657 | { | |
658 | qstats_drop_inc(&sch->qstats); | |
659 | } | |
660 | ||
661 | static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) | |
662 | { | |
eb60a8dd | 663 | this_cpu_inc(sch->cpu_qstats->drops); |
b0ab6f92 JF |
664 | } |
665 | ||
25331d6c JF |
666 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
667 | { | |
668 | sch->qstats.overlimits++; | |
669 | } | |
670 | ||
48da34b7 FW |
671 | static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh) |
672 | { | |
673 | qh->head = NULL; | |
674 | qh->tail = NULL; | |
675 | qh->qlen = 0; | |
676 | } | |
677 | ||
9972b25d | 678 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
48da34b7 | 679 | struct qdisc_skb_head *qh) |
9972b25d | 680 | { |
48da34b7 FW |
681 | struct sk_buff *last = qh->tail; |
682 | ||
683 | if (last) { | |
684 | skb->next = NULL; | |
685 | last->next = skb; | |
686 | qh->tail = skb; | |
687 | } else { | |
688 | qh->tail = skb; | |
689 | qh->head = skb; | |
690 | } | |
691 | qh->qlen++; | |
25331d6c | 692 | qdisc_qstats_backlog_inc(sch, skb); |
9972b25d TG |
693 | |
694 | return NET_XMIT_SUCCESS; | |
695 | } | |
696 | ||
697 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
698 | { | |
699 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
700 | } | |
701 | ||
48da34b7 | 702 | static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) |
9972b25d | 703 | { |
48da34b7 FW |
704 | struct sk_buff *skb = qh->head; |
705 | ||
706 | if (likely(skb != NULL)) { | |
707 | qh->head = skb->next; | |
708 | qh->qlen--; | |
709 | if (qh->head == NULL) | |
710 | qh->tail = NULL; | |
711 | skb->next = NULL; | |
712 | } | |
9972b25d | 713 | |
ec323368 FW |
714 | return skb; |
715 | } | |
716 | ||
717 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
718 | { | |
719 | struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); | |
720 | ||
9190b3b3 | 721 | if (likely(skb != NULL)) { |
25331d6c | 722 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
723 | qdisc_bstats_update(sch, skb); |
724 | } | |
9972b25d TG |
725 | |
726 | return skb; | |
727 | } | |
728 | ||
520ac30f ED |
729 | /* Instead of calling kfree_skb() while root qdisc lock is held, |
730 | * queue the skb for future freeing at end of __dev_xmit_skb() | |
731 | */ | |
732 | static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) | |
733 | { | |
734 | skb->next = *to_free; | |
735 | *to_free = skb; | |
736 | } | |
737 | ||
1c81b043 AK |
738 | static inline void __qdisc_drop_all(struct sk_buff *skb, |
739 | struct sk_buff **to_free) | |
740 | { | |
741 | if (skb->prev) | |
742 | skb->prev->next = *to_free; | |
743 | else | |
744 | skb->next = *to_free; | |
745 | *to_free = skb; | |
746 | } | |
747 | ||
57dbb2d8 | 748 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, |
48da34b7 | 749 | struct qdisc_skb_head *qh, |
520ac30f | 750 | struct sk_buff **to_free) |
57dbb2d8 | 751 | { |
48da34b7 | 752 | struct sk_buff *skb = __qdisc_dequeue_head(qh); |
57dbb2d8 HPP |
753 | |
754 | if (likely(skb != NULL)) { | |
755 | unsigned int len = qdisc_pkt_len(skb); | |
520ac30f | 756 | |
25331d6c | 757 | qdisc_qstats_backlog_dec(sch, skb); |
520ac30f | 758 | __qdisc_drop(skb, to_free); |
57dbb2d8 HPP |
759 | return len; |
760 | } | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
520ac30f ED |
765 | static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch, |
766 | struct sk_buff **to_free) | |
57dbb2d8 | 767 | { |
520ac30f | 768 | return __qdisc_queue_drop_head(sch, &sch->q, to_free); |
9972b25d TG |
769 | } |
770 | ||
48a8f519 PM |
771 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
772 | { | |
48da34b7 FW |
773 | const struct qdisc_skb_head *qh = &sch->q; |
774 | ||
775 | return qh->head; | |
48a8f519 PM |
776 | } |
777 | ||
77be155c JP |
778 | /* generic pseudo peek method for non-work-conserving qdisc */ |
779 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
780 | { | |
781 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ | |
61c9eaf9 | 782 | if (!sch->gso_skb) { |
77be155c | 783 | sch->gso_skb = sch->dequeue(sch); |
a27758ff | 784 | if (sch->gso_skb) { |
61c9eaf9 | 785 | /* it's still part of the queue */ |
a27758ff | 786 | qdisc_qstats_backlog_inc(sch, sch->gso_skb); |
61c9eaf9 | 787 | sch->q.qlen++; |
a27758ff | 788 | } |
61c9eaf9 | 789 | } |
77be155c JP |
790 | |
791 | return sch->gso_skb; | |
792 | } | |
793 | ||
794 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
795 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
796 | { | |
797 | struct sk_buff *skb = sch->gso_skb; | |
798 | ||
61c9eaf9 | 799 | if (skb) { |
77be155c | 800 | sch->gso_skb = NULL; |
a27758ff | 801 | qdisc_qstats_backlog_dec(sch, skb); |
61c9eaf9 JP |
802 | sch->q.qlen--; |
803 | } else { | |
77be155c | 804 | skb = sch->dequeue(sch); |
61c9eaf9 | 805 | } |
77be155c JP |
806 | |
807 | return skb; | |
808 | } | |
809 | ||
48da34b7 | 810 | static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) |
9972b25d TG |
811 | { |
812 | /* | |
813 | * We do not know the backlog in bytes of this list, it | |
814 | * is up to the caller to correct it | |
815 | */ | |
48da34b7 FW |
816 | ASSERT_RTNL(); |
817 | if (qh->qlen) { | |
818 | rtnl_kfree_skbs(qh->head, qh->tail); | |
819 | ||
820 | qh->head = NULL; | |
821 | qh->tail = NULL; | |
822 | qh->qlen = 0; | |
1b5c5493 | 823 | } |
9972b25d TG |
824 | } |
825 | ||
826 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
827 | { | |
1b5c5493 | 828 | __qdisc_reset_queue(&sch->q); |
9972b25d TG |
829 | sch->qstats.backlog = 0; |
830 | } | |
831 | ||
86a7996c WC |
832 | static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, |
833 | struct Qdisc **pold) | |
834 | { | |
835 | struct Qdisc *old; | |
836 | ||
837 | sch_tree_lock(sch); | |
838 | old = *pold; | |
839 | *pold = new; | |
840 | if (old != NULL) { | |
68a66d14 KK |
841 | unsigned int qlen = old->q.qlen; |
842 | unsigned int backlog = old->qstats.backlog; | |
843 | ||
86a7996c | 844 | qdisc_reset(old); |
68a66d14 | 845 | qdisc_tree_reduce_backlog(old, qlen, backlog); |
86a7996c WC |
846 | } |
847 | sch_tree_unlock(sch); | |
848 | ||
849 | return old; | |
850 | } | |
851 | ||
1b5c5493 ED |
852 | static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) |
853 | { | |
854 | rtnl_kfree_skbs(skb, skb); | |
855 | qdisc_qstats_drop(sch); | |
856 | } | |
857 | ||
520ac30f ED |
858 | |
859 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, | |
860 | struct sk_buff **to_free) | |
9972b25d | 861 | { |
520ac30f | 862 | __qdisc_drop(skb, to_free); |
25331d6c | 863 | qdisc_qstats_drop(sch); |
9972b25d TG |
864 | |
865 | return NET_XMIT_DROP; | |
866 | } | |
867 | ||
1c81b043 AK |
868 | static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, |
869 | struct sk_buff **to_free) | |
870 | { | |
871 | __qdisc_drop_all(skb, to_free); | |
872 | qdisc_qstats_drop(sch); | |
873 | ||
874 | return NET_XMIT_DROP; | |
875 | } | |
876 | ||
e9bef55d JDB |
877 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
878 | long it will take to send a packet given its size. | |
879 | */ | |
880 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
881 | { | |
e08b0998 JDB |
882 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
883 | if (slot < 0) | |
884 | slot = 0; | |
e9bef55d JDB |
885 | slot >>= rtab->rate.cell_log; |
886 | if (slot > 255) | |
a02cec21 | 887 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
888 | return rtab->data[slot]; |
889 | } | |
890 | ||
292f1c7f | 891 | struct psched_ratecfg { |
130d3d68 | 892 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
893 | u32 mult; |
894 | u16 overhead; | |
8a8e3d84 | 895 | u8 linklayer; |
01cb71d2 | 896 | u8 shift; |
292f1c7f JP |
897 | }; |
898 | ||
899 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
900 | unsigned int len) | |
901 | { | |
8a8e3d84 JDB |
902 | len += r->overhead; |
903 | ||
904 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
905 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
906 | ||
907 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
908 | } |
909 | ||
5c15257f | 910 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
911 | const struct tc_ratespec *conf, |
912 | u64 rate64); | |
292f1c7f | 913 | |
01cb71d2 ED |
914 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
915 | const struct psched_ratecfg *r) | |
292f1c7f | 916 | { |
01cb71d2 | 917 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
918 | |
919 | /* legacy struct tc_ratespec has a 32bit @rate field | |
920 | * Qdisc using 64bit rate should add new attributes | |
921 | * in order to maintain compatibility. | |
922 | */ | |
923 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
924 | ||
01cb71d2 | 925 | res->overhead = r->overhead; |
8a8e3d84 | 926 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
927 | } |
928 | ||
46209401 JP |
929 | /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. |
930 | * The fast path only needs to access filter list and to update stats | |
931 | */ | |
932 | struct mini_Qdisc { | |
933 | struct tcf_proto *filter_list; | |
934 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; | |
935 | struct gnet_stats_queue __percpu *cpu_qstats; | |
936 | struct rcu_head rcu; | |
937 | }; | |
938 | ||
939 | static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, | |
940 | const struct sk_buff *skb) | |
941 | { | |
942 | bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb); | |
943 | } | |
944 | ||
945 | static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) | |
946 | { | |
947 | this_cpu_inc(miniq->cpu_qstats->drops); | |
948 | } | |
949 | ||
950 | struct mini_Qdisc_pair { | |
951 | struct mini_Qdisc miniq1; | |
952 | struct mini_Qdisc miniq2; | |
953 | struct mini_Qdisc __rcu **p_miniq; | |
954 | }; | |
955 | ||
956 | void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, | |
957 | struct tcf_proto *tp_head); | |
958 | void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, | |
959 | struct mini_Qdisc __rcu **p_miniq); | |
960 | ||
1da177e4 | 961 | #endif |