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> |
1da177e4 | 14 | #include <net/gen_stats.h> |
be577ddc | 15 | #include <net/rtnetlink.h> |
1da177e4 LT |
16 | |
17 | struct Qdisc_ops; | |
18 | struct qdisc_walker; | |
19 | struct tcf_walker; | |
20 | struct module; | |
21 | ||
fd2c3ef7 | 22 | struct qdisc_rate_table { |
1da177e4 LT |
23 | struct tc_ratespec rate; |
24 | u32 data[256]; | |
25 | struct qdisc_rate_table *next; | |
26 | int refcnt; | |
27 | }; | |
28 | ||
fd2c3ef7 | 29 | enum qdisc_state_t { |
37437bb2 | 30 | __QDISC_STATE_SCHED, |
a9312ae8 | 31 | __QDISC_STATE_DEACTIVATED, |
e2627c8c DM |
32 | }; |
33 | ||
175f9c1b | 34 | struct qdisc_size_table { |
a2da570d | 35 | struct rcu_head rcu; |
175f9c1b JK |
36 | struct list_head list; |
37 | struct tc_sizespec szopts; | |
38 | int refcnt; | |
39 | u16 data[]; | |
40 | }; | |
41 | ||
48da34b7 FW |
42 | /* similar to sk_buff_head, but skb->prev pointer is undefined. */ |
43 | struct qdisc_skb_head { | |
44 | struct sk_buff *head; | |
45 | struct sk_buff *tail; | |
46 | __u32 qlen; | |
47 | spinlock_t lock; | |
48 | }; | |
49 | ||
fd2c3ef7 | 50 | struct Qdisc { |
520ac30f ED |
51 | int (*enqueue)(struct sk_buff *skb, |
52 | struct Qdisc *sch, | |
53 | struct sk_buff **to_free); | |
54 | struct sk_buff * (*dequeue)(struct Qdisc *sch); | |
05bdd2f1 | 55 | unsigned int flags; |
b00355db | 56 | #define TCQ_F_BUILTIN 1 |
fd245a4a ED |
57 | #define TCQ_F_INGRESS 2 |
58 | #define TCQ_F_CAN_BYPASS 4 | |
59 | #define TCQ_F_MQROOT 8 | |
1abbe139 ED |
60 | #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for |
61 | * q->dev_queue : It can test | |
62 | * netif_xmit_frozen_or_stopped() before | |
63 | * dequeueing next packet. | |
64 | * Its true for MQ/MQPRIO slaves, or non | |
65 | * multiqueue device. | |
66 | */ | |
b00355db | 67 | #define TCQ_F_WARN_NONWC (1 << 16) |
22e0f8b9 | 68 | #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ |
4eaf3b84 ED |
69 | #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : |
70 | * qdisc_tree_decrease_qlen() should stop. | |
71 | */ | |
49b49971 | 72 | #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ |
45203a3b | 73 | u32 limit; |
05bdd2f1 | 74 | const struct Qdisc_ops *ops; |
a2da570d | 75 | struct qdisc_size_table __rcu *stab; |
59cc1f61 | 76 | struct hlist_node hash; |
1da177e4 LT |
77 | u32 handle; |
78 | u32 parent; | |
72b25a91 | 79 | |
5e140dfc | 80 | struct netdev_queue *dev_queue; |
5e140dfc | 81 | |
1c0d32fd | 82 | struct net_rate_estimator __rcu *rate_est; |
0d32ef8c ED |
83 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; |
84 | struct gnet_stats_queue __percpu *cpu_qstats; | |
85 | ||
5e140dfc ED |
86 | /* |
87 | * For performance sake on SMP, we put highly modified fields at the end | |
88 | */ | |
4d202a0d | 89 | struct sk_buff *gso_skb ____cacheline_aligned_in_smp; |
48da34b7 | 90 | struct qdisc_skb_head q; |
0d32ef8c | 91 | struct gnet_stats_basic_packed bstats; |
f9eb8aea | 92 | seqcount_t running; |
0d32ef8c | 93 | struct gnet_stats_queue qstats; |
4d202a0d ED |
94 | unsigned long state; |
95 | struct Qdisc *next_sched; | |
96 | struct sk_buff *skb_bad_txq; | |
79640a4c | 97 | struct rcu_head rcu_head; |
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 | ||
2190d1d0 JP |
264 | struct tcf_chain { |
265 | struct tcf_proto __rcu *filter_chain; | |
6529eaba | 266 | struct tcf_proto __rcu **p_filter_chain; |
5bc17018 JP |
267 | struct list_head list; |
268 | struct tcf_block *block; | |
269 | u32 index; /* chain index */ | |
270 | unsigned int refcnt; | |
6529eaba JP |
271 | }; |
272 | ||
2190d1d0 | 273 | struct tcf_block { |
5bc17018 | 274 | struct list_head chain_list; |
2190d1d0 JP |
275 | }; |
276 | ||
16bda13d DM |
277 | static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
278 | { | |
279 | struct qdisc_skb_cb *qcb; | |
5ee31c68 ED |
280 | |
281 | BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); | |
16bda13d DM |
282 | BUILD_BUG_ON(sizeof(qcb->data) < sz); |
283 | } | |
284 | ||
05bdd2f1 | 285 | static inline int qdisc_qlen(const struct Qdisc *q) |
bbd8a0d3 KK |
286 | { |
287 | return q->q.qlen; | |
288 | } | |
289 | ||
bfe0d029 | 290 | static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
175f9c1b JK |
291 | { |
292 | return (struct qdisc_skb_cb *)skb->cb; | |
293 | } | |
294 | ||
83874000 DM |
295 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
296 | { | |
297 | return &qdisc->q.lock; | |
298 | } | |
299 | ||
05bdd2f1 | 300 | static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
7698b4fc | 301 | { |
46e5da40 JF |
302 | struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
303 | ||
304 | return q; | |
7698b4fc DM |
305 | } |
306 | ||
05bdd2f1 | 307 | static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
2540e051 JP |
308 | { |
309 | return qdisc->dev_queue->qdisc_sleeping; | |
310 | } | |
311 | ||
7e43f112 DM |
312 | /* The qdisc root lock is a mechanism by which to top level |
313 | * of a qdisc tree can be locked from any qdisc node in the | |
314 | * forest. This allows changing the configuration of some | |
315 | * aspect of the qdisc tree while blocking out asynchronous | |
316 | * qdisc access in the packet processing paths. | |
317 | * | |
318 | * It is only legal to do this when the root will not change | |
319 | * on us. Otherwise we'll potentially lock the wrong qdisc | |
320 | * root. This is enforced by holding the RTNL semaphore, which | |
321 | * all users of this lock accessor must do. | |
322 | */ | |
05bdd2f1 | 323 | static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) |
7698b4fc DM |
324 | { |
325 | struct Qdisc *root = qdisc_root(qdisc); | |
326 | ||
7e43f112 | 327 | ASSERT_RTNL(); |
83874000 | 328 | return qdisc_lock(root); |
7698b4fc DM |
329 | } |
330 | ||
05bdd2f1 | 331 | static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
f6f9b93f JP |
332 | { |
333 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
334 | ||
335 | ASSERT_RTNL(); | |
336 | return qdisc_lock(root); | |
337 | } | |
338 | ||
edb09eb1 ED |
339 | static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) |
340 | { | |
341 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
342 | ||
343 | ASSERT_RTNL(); | |
344 | return &root->running; | |
345 | } | |
346 | ||
05bdd2f1 | 347 | static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) |
5ce2d488 DM |
348 | { |
349 | return qdisc->dev_queue->dev; | |
350 | } | |
1da177e4 | 351 | |
05bdd2f1 | 352 | static inline void sch_tree_lock(const struct Qdisc *q) |
78a5b30b | 353 | { |
fe439dd0 | 354 | spin_lock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
355 | } |
356 | ||
05bdd2f1 | 357 | static inline void sch_tree_unlock(const struct Qdisc *q) |
78a5b30b | 358 | { |
fe439dd0 | 359 | spin_unlock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
360 | } |
361 | ||
362 | #define tcf_tree_lock(tp) sch_tree_lock((tp)->q) | |
363 | #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q) | |
1da177e4 | 364 | |
e41a33e6 TG |
365 | extern struct Qdisc noop_qdisc; |
366 | extern struct Qdisc_ops noop_qdisc_ops; | |
6ec1c69a DM |
367 | extern struct Qdisc_ops pfifo_fast_ops; |
368 | extern struct Qdisc_ops mq_qdisc_ops; | |
d66d6c31 | 369 | extern struct Qdisc_ops noqueue_qdisc_ops; |
6da7c8fc | 370 | extern const struct Qdisc_ops *default_qdisc_ops; |
1f27cde3 ED |
371 | static inline const struct Qdisc_ops * |
372 | get_default_qdisc_ops(const struct net_device *dev, int ntx) | |
373 | { | |
374 | return ntx < dev->real_num_tx_queues ? | |
375 | default_qdisc_ops : &pfifo_fast_ops; | |
376 | } | |
e41a33e6 | 377 | |
fd2c3ef7 | 378 | struct Qdisc_class_common { |
6fe1c7a5 PM |
379 | u32 classid; |
380 | struct hlist_node hnode; | |
381 | }; | |
382 | ||
fd2c3ef7 | 383 | struct Qdisc_class_hash { |
6fe1c7a5 PM |
384 | struct hlist_head *hash; |
385 | unsigned int hashsize; | |
386 | unsigned int hashmask; | |
387 | unsigned int hashelems; | |
388 | }; | |
389 | ||
390 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
391 | { | |
392 | id ^= id >> 8; | |
393 | id ^= id >> 4; | |
394 | return id & mask; | |
395 | } | |
396 | ||
397 | static inline struct Qdisc_class_common * | |
05bdd2f1 | 398 | qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
6fe1c7a5 PM |
399 | { |
400 | struct Qdisc_class_common *cl; | |
6fe1c7a5 PM |
401 | unsigned int h; |
402 | ||
7d3f0cd4 GF |
403 | if (!id) |
404 | return NULL; | |
405 | ||
6fe1c7a5 | 406 | h = qdisc_class_hash(id, hash->hashmask); |
b67bfe0d | 407 | hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
6fe1c7a5 PM |
408 | if (cl->classid == id) |
409 | return cl; | |
410 | } | |
411 | return NULL; | |
412 | } | |
413 | ||
5c15257f JP |
414 | int qdisc_class_hash_init(struct Qdisc_class_hash *); |
415 | void qdisc_class_hash_insert(struct Qdisc_class_hash *, | |
416 | struct Qdisc_class_common *); | |
417 | void qdisc_class_hash_remove(struct Qdisc_class_hash *, | |
418 | struct Qdisc_class_common *); | |
419 | void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
420 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
421 | ||
422 | void dev_init_scheduler(struct net_device *dev); | |
423 | void dev_shutdown(struct net_device *dev); | |
424 | void dev_activate(struct net_device *dev); | |
425 | void dev_deactivate(struct net_device *dev); | |
426 | void dev_deactivate_many(struct list_head *head); | |
427 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
428 | struct Qdisc *qdisc); | |
429 | void qdisc_reset(struct Qdisc *qdisc); | |
430 | void qdisc_destroy(struct Qdisc *qdisc); | |
2ccccf5f WC |
431 | void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n, |
432 | unsigned int len); | |
5c15257f | 433 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d2a7f269 | 434 | const struct Qdisc_ops *ops); |
5c15257f | 435 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 436 | const struct Qdisc_ops *ops, u32 parentid); |
5c15257f JP |
437 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
438 | const struct qdisc_size_table *stab); | |
27b29f63 | 439 | int skb_do_redirect(struct sk_buff *); |
1da177e4 | 440 | |
a5135bcf WB |
441 | static inline void skb_reset_tc(struct sk_buff *skb) |
442 | { | |
443 | #ifdef CONFIG_NET_CLS_ACT | |
bc31c905 | 444 | skb->tc_redirected = 0; |
a5135bcf WB |
445 | #endif |
446 | } | |
447 | ||
fdc5432a DB |
448 | static inline bool skb_at_tc_ingress(const struct sk_buff *skb) |
449 | { | |
450 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 451 | return skb->tc_at_ingress; |
fdc5432a DB |
452 | #else |
453 | return false; | |
454 | #endif | |
455 | } | |
456 | ||
e7246e12 WB |
457 | static inline bool skb_skip_tc_classify(struct sk_buff *skb) |
458 | { | |
459 | #ifdef CONFIG_NET_CLS_ACT | |
460 | if (skb->tc_skip_classify) { | |
461 | skb->tc_skip_classify = 0; | |
462 | return true; | |
463 | } | |
464 | #endif | |
465 | return false; | |
466 | } | |
467 | ||
f0796d5c JF |
468 | /* Reset all TX qdiscs greater then index of a device. */ |
469 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) | |
5aa70995 | 470 | { |
4ef6acff JF |
471 | struct Qdisc *qdisc; |
472 | ||
f0796d5c | 473 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 474 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
475 | if (qdisc) { |
476 | spin_lock_bh(qdisc_lock(qdisc)); | |
477 | qdisc_reset(qdisc); | |
478 | spin_unlock_bh(qdisc_lock(qdisc)); | |
479 | } | |
480 | } | |
5aa70995 DM |
481 | } |
482 | ||
5aa70995 DM |
483 | static inline void qdisc_reset_all_tx(struct net_device *dev) |
484 | { | |
f0796d5c | 485 | qdisc_reset_all_tx_gt(dev, 0); |
5aa70995 DM |
486 | } |
487 | ||
3e745dd6 DM |
488 | /* Are all TX queues of the device empty? */ |
489 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
490 | { | |
e8a0464c | 491 | unsigned int i; |
46e5da40 JF |
492 | |
493 | rcu_read_lock(); | |
e8a0464c DM |
494 | for (i = 0; i < dev->num_tx_queues; i++) { |
495 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 496 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 497 | |
46e5da40 JF |
498 | if (q->q.qlen) { |
499 | rcu_read_unlock(); | |
e8a0464c | 500 | return false; |
46e5da40 | 501 | } |
e8a0464c | 502 | } |
46e5da40 | 503 | rcu_read_unlock(); |
e8a0464c | 504 | return true; |
3e745dd6 DM |
505 | } |
506 | ||
6fa9864b | 507 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 508 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 509 | { |
e8a0464c | 510 | unsigned int i; |
46e5da40 | 511 | |
e8a0464c DM |
512 | for (i = 0; i < dev->num_tx_queues; i++) { |
513 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 514 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
515 | return true; |
516 | } | |
517 | return false; | |
6fa9864b DM |
518 | } |
519 | ||
e8a0464c | 520 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
521 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
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) != &noop_qdisc) |
e8a0464c DM |
528 | return false; |
529 | } | |
530 | return true; | |
05297949 DM |
531 | } |
532 | ||
bfe0d029 | 533 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 534 | { |
175f9c1b | 535 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
536 | } |
537 | ||
c27f339a | 538 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
539 | enum net_xmit_qdisc_t { |
540 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 541 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
542 | }; |
543 | ||
c27f339a | 544 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 545 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
546 | #else |
547 | #define net_xmit_drop_count(e) (1) | |
548 | #endif | |
549 | ||
a2da570d ED |
550 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
551 | const struct Qdisc *sch) | |
5f86173b | 552 | { |
3a682fbd | 553 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
554 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
555 | ||
556 | if (stab) | |
557 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 558 | #endif |
a2da570d ED |
559 | } |
560 | ||
520ac30f ED |
561 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
562 | struct sk_buff **to_free) | |
a2da570d ED |
563 | { |
564 | qdisc_calculate_pkt_len(skb, sch); | |
520ac30f | 565 | return sch->enqueue(skb, sch, to_free); |
5f86173b JK |
566 | } |
567 | ||
22e0f8b9 JF |
568 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
569 | { | |
570 | return q->flags & TCQ_F_CPUSTATS; | |
571 | } | |
bfe0d029 | 572 | |
38040702 AV |
573 | static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, |
574 | __u64 bytes, __u32 packets) | |
575 | { | |
576 | bstats->bytes += bytes; | |
577 | bstats->packets += packets; | |
578 | } | |
579 | ||
bfe0d029 ED |
580 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, |
581 | const struct sk_buff *skb) | |
582 | { | |
38040702 AV |
583 | _bstats_update(bstats, |
584 | qdisc_pkt_len(skb), | |
585 | skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); | |
586 | } | |
587 | ||
588 | static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, | |
589 | __u64 bytes, __u32 packets) | |
590 | { | |
591 | u64_stats_update_begin(&bstats->syncp); | |
592 | _bstats_update(&bstats->bstats, bytes, packets); | |
593 | u64_stats_update_end(&bstats->syncp); | |
bfe0d029 ED |
594 | } |
595 | ||
24ea591d ED |
596 | static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, |
597 | const struct sk_buff *skb) | |
22e0f8b9 | 598 | { |
22e0f8b9 JF |
599 | u64_stats_update_begin(&bstats->syncp); |
600 | bstats_update(&bstats->bstats, skb); | |
601 | u64_stats_update_end(&bstats->syncp); | |
602 | } | |
603 | ||
24ea591d ED |
604 | static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
605 | const struct sk_buff *skb) | |
606 | { | |
607 | bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); | |
608 | } | |
609 | ||
bfe0d029 ED |
610 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
611 | const struct sk_buff *skb) | |
bbd8a0d3 | 612 | { |
bfe0d029 | 613 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
614 | } |
615 | ||
25331d6c JF |
616 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
617 | const struct sk_buff *skb) | |
618 | { | |
619 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
620 | } | |
621 | ||
622 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, | |
623 | const struct sk_buff *skb) | |
624 | { | |
625 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
626 | } | |
627 | ||
628 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) | |
629 | { | |
630 | sch->qstats.drops += count; | |
631 | } | |
632 | ||
24ea591d | 633 | static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
25331d6c | 634 | { |
24ea591d | 635 | qstats->drops++; |
25331d6c JF |
636 | } |
637 | ||
24ea591d | 638 | static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
b0ab6f92 | 639 | { |
24ea591d ED |
640 | qstats->overlimits++; |
641 | } | |
b0ab6f92 | 642 | |
24ea591d ED |
643 | static inline void qdisc_qstats_drop(struct Qdisc *sch) |
644 | { | |
645 | qstats_drop_inc(&sch->qstats); | |
646 | } | |
647 | ||
648 | static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) | |
649 | { | |
eb60a8dd | 650 | this_cpu_inc(sch->cpu_qstats->drops); |
b0ab6f92 JF |
651 | } |
652 | ||
25331d6c JF |
653 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
654 | { | |
655 | sch->qstats.overlimits++; | |
656 | } | |
657 | ||
48da34b7 FW |
658 | static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh) |
659 | { | |
660 | qh->head = NULL; | |
661 | qh->tail = NULL; | |
662 | qh->qlen = 0; | |
663 | } | |
664 | ||
9972b25d | 665 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
48da34b7 | 666 | struct qdisc_skb_head *qh) |
9972b25d | 667 | { |
48da34b7 FW |
668 | struct sk_buff *last = qh->tail; |
669 | ||
670 | if (last) { | |
671 | skb->next = NULL; | |
672 | last->next = skb; | |
673 | qh->tail = skb; | |
674 | } else { | |
675 | qh->tail = skb; | |
676 | qh->head = skb; | |
677 | } | |
678 | qh->qlen++; | |
25331d6c | 679 | qdisc_qstats_backlog_inc(sch, skb); |
9972b25d TG |
680 | |
681 | return NET_XMIT_SUCCESS; | |
682 | } | |
683 | ||
684 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
685 | { | |
686 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
687 | } | |
688 | ||
48da34b7 | 689 | static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) |
9972b25d | 690 | { |
48da34b7 FW |
691 | struct sk_buff *skb = qh->head; |
692 | ||
693 | if (likely(skb != NULL)) { | |
694 | qh->head = skb->next; | |
695 | qh->qlen--; | |
696 | if (qh->head == NULL) | |
697 | qh->tail = NULL; | |
698 | skb->next = NULL; | |
699 | } | |
9972b25d | 700 | |
ec323368 FW |
701 | return skb; |
702 | } | |
703 | ||
704 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
705 | { | |
706 | struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); | |
707 | ||
9190b3b3 | 708 | if (likely(skb != NULL)) { |
25331d6c | 709 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
710 | qdisc_bstats_update(sch, skb); |
711 | } | |
9972b25d TG |
712 | |
713 | return skb; | |
714 | } | |
715 | ||
520ac30f ED |
716 | /* Instead of calling kfree_skb() while root qdisc lock is held, |
717 | * queue the skb for future freeing at end of __dev_xmit_skb() | |
718 | */ | |
719 | static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) | |
720 | { | |
721 | skb->next = *to_free; | |
722 | *to_free = skb; | |
723 | } | |
724 | ||
57dbb2d8 | 725 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, |
48da34b7 | 726 | struct qdisc_skb_head *qh, |
520ac30f | 727 | struct sk_buff **to_free) |
57dbb2d8 | 728 | { |
48da34b7 | 729 | struct sk_buff *skb = __qdisc_dequeue_head(qh); |
57dbb2d8 HPP |
730 | |
731 | if (likely(skb != NULL)) { | |
732 | unsigned int len = qdisc_pkt_len(skb); | |
520ac30f | 733 | |
25331d6c | 734 | qdisc_qstats_backlog_dec(sch, skb); |
520ac30f | 735 | __qdisc_drop(skb, to_free); |
57dbb2d8 HPP |
736 | return len; |
737 | } | |
738 | ||
739 | return 0; | |
740 | } | |
741 | ||
520ac30f ED |
742 | static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch, |
743 | struct sk_buff **to_free) | |
57dbb2d8 | 744 | { |
520ac30f | 745 | return __qdisc_queue_drop_head(sch, &sch->q, to_free); |
9972b25d TG |
746 | } |
747 | ||
48a8f519 PM |
748 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
749 | { | |
48da34b7 FW |
750 | const struct qdisc_skb_head *qh = &sch->q; |
751 | ||
752 | return qh->head; | |
48a8f519 PM |
753 | } |
754 | ||
77be155c JP |
755 | /* generic pseudo peek method for non-work-conserving qdisc */ |
756 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
757 | { | |
758 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ | |
61c9eaf9 | 759 | if (!sch->gso_skb) { |
77be155c | 760 | sch->gso_skb = sch->dequeue(sch); |
a27758ff | 761 | if (sch->gso_skb) { |
61c9eaf9 | 762 | /* it's still part of the queue */ |
a27758ff | 763 | qdisc_qstats_backlog_inc(sch, sch->gso_skb); |
61c9eaf9 | 764 | sch->q.qlen++; |
a27758ff | 765 | } |
61c9eaf9 | 766 | } |
77be155c JP |
767 | |
768 | return sch->gso_skb; | |
769 | } | |
770 | ||
771 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
772 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
773 | { | |
774 | struct sk_buff *skb = sch->gso_skb; | |
775 | ||
61c9eaf9 | 776 | if (skb) { |
77be155c | 777 | sch->gso_skb = NULL; |
a27758ff | 778 | qdisc_qstats_backlog_dec(sch, skb); |
61c9eaf9 JP |
779 | sch->q.qlen--; |
780 | } else { | |
77be155c | 781 | skb = sch->dequeue(sch); |
61c9eaf9 | 782 | } |
77be155c JP |
783 | |
784 | return skb; | |
785 | } | |
786 | ||
48da34b7 | 787 | static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) |
9972b25d TG |
788 | { |
789 | /* | |
790 | * We do not know the backlog in bytes of this list, it | |
791 | * is up to the caller to correct it | |
792 | */ | |
48da34b7 FW |
793 | ASSERT_RTNL(); |
794 | if (qh->qlen) { | |
795 | rtnl_kfree_skbs(qh->head, qh->tail); | |
796 | ||
797 | qh->head = NULL; | |
798 | qh->tail = NULL; | |
799 | qh->qlen = 0; | |
1b5c5493 | 800 | } |
9972b25d TG |
801 | } |
802 | ||
803 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
804 | { | |
1b5c5493 | 805 | __qdisc_reset_queue(&sch->q); |
9972b25d TG |
806 | sch->qstats.backlog = 0; |
807 | } | |
808 | ||
86a7996c WC |
809 | static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, |
810 | struct Qdisc **pold) | |
811 | { | |
812 | struct Qdisc *old; | |
813 | ||
814 | sch_tree_lock(sch); | |
815 | old = *pold; | |
816 | *pold = new; | |
817 | if (old != NULL) { | |
68a66d14 KK |
818 | unsigned int qlen = old->q.qlen; |
819 | unsigned int backlog = old->qstats.backlog; | |
820 | ||
86a7996c | 821 | qdisc_reset(old); |
68a66d14 | 822 | qdisc_tree_reduce_backlog(old, qlen, backlog); |
86a7996c WC |
823 | } |
824 | sch_tree_unlock(sch); | |
825 | ||
826 | return old; | |
827 | } | |
828 | ||
1b5c5493 ED |
829 | static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) |
830 | { | |
831 | rtnl_kfree_skbs(skb, skb); | |
832 | qdisc_qstats_drop(sch); | |
833 | } | |
834 | ||
520ac30f ED |
835 | |
836 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, | |
837 | struct sk_buff **to_free) | |
9972b25d | 838 | { |
520ac30f | 839 | __qdisc_drop(skb, to_free); |
25331d6c | 840 | qdisc_qstats_drop(sch); |
9972b25d TG |
841 | |
842 | return NET_XMIT_DROP; | |
843 | } | |
844 | ||
e9bef55d JDB |
845 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
846 | long it will take to send a packet given its size. | |
847 | */ | |
848 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
849 | { | |
e08b0998 JDB |
850 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
851 | if (slot < 0) | |
852 | slot = 0; | |
e9bef55d JDB |
853 | slot >>= rtab->rate.cell_log; |
854 | if (slot > 255) | |
a02cec21 | 855 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
856 | return rtab->data[slot]; |
857 | } | |
858 | ||
292f1c7f | 859 | struct psched_ratecfg { |
130d3d68 | 860 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
861 | u32 mult; |
862 | u16 overhead; | |
8a8e3d84 | 863 | u8 linklayer; |
01cb71d2 | 864 | u8 shift; |
292f1c7f JP |
865 | }; |
866 | ||
867 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
868 | unsigned int len) | |
869 | { | |
8a8e3d84 JDB |
870 | len += r->overhead; |
871 | ||
872 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
873 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
874 | ||
875 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
876 | } |
877 | ||
5c15257f | 878 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
879 | const struct tc_ratespec *conf, |
880 | u64 rate64); | |
292f1c7f | 881 | |
01cb71d2 ED |
882 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
883 | const struct psched_ratecfg *r) | |
292f1c7f | 884 | { |
01cb71d2 | 885 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
886 | |
887 | /* legacy struct tc_ratespec has a 32bit @rate field | |
888 | * Qdisc using 64bit rate should add new attributes | |
889 | * in order to maintain compatibility. | |
890 | */ | |
891 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
892 | ||
01cb71d2 | 893 | res->overhead = r->overhead; |
8a8e3d84 | 894 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
895 | } |
896 | ||
1da177e4 | 897 | #endif |