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