Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef __NET_SCHED_GENERIC_H |
2 | #define __NET_SCHED_GENERIC_H | |
3 | ||
1da177e4 LT |
4 | #include <linux/netdevice.h> |
5 | #include <linux/types.h> | |
6 | #include <linux/rcupdate.h> | |
1da177e4 LT |
7 | #include <linux/pkt_sched.h> |
8 | #include <linux/pkt_cls.h> | |
22e0f8b9 | 9 | #include <linux/percpu.h> |
5772e9a3 | 10 | #include <linux/dynamic_queue_limits.h> |
5bc17018 | 11 | #include <linux/list.h> |
7b936405 | 12 | #include <linux/refcount.h> |
7aa0045d | 13 | #include <linux/workqueue.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; |
7aa0045d | 275 | struct work_struct work; |
2190d1d0 JP |
276 | }; |
277 | ||
16bda13d DM |
278 | static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
279 | { | |
280 | struct qdisc_skb_cb *qcb; | |
5ee31c68 ED |
281 | |
282 | BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); | |
16bda13d DM |
283 | BUILD_BUG_ON(sizeof(qcb->data) < sz); |
284 | } | |
285 | ||
05bdd2f1 | 286 | static inline int qdisc_qlen(const struct Qdisc *q) |
bbd8a0d3 KK |
287 | { |
288 | return q->q.qlen; | |
289 | } | |
290 | ||
bfe0d029 | 291 | static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
175f9c1b JK |
292 | { |
293 | return (struct qdisc_skb_cb *)skb->cb; | |
294 | } | |
295 | ||
83874000 DM |
296 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
297 | { | |
298 | return &qdisc->q.lock; | |
299 | } | |
300 | ||
05bdd2f1 | 301 | static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
7698b4fc | 302 | { |
46e5da40 JF |
303 | struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
304 | ||
305 | return q; | |
7698b4fc DM |
306 | } |
307 | ||
05bdd2f1 | 308 | static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
2540e051 JP |
309 | { |
310 | return qdisc->dev_queue->qdisc_sleeping; | |
311 | } | |
312 | ||
7e43f112 DM |
313 | /* The qdisc root lock is a mechanism by which to top level |
314 | * of a qdisc tree can be locked from any qdisc node in the | |
315 | * forest. This allows changing the configuration of some | |
316 | * aspect of the qdisc tree while blocking out asynchronous | |
317 | * qdisc access in the packet processing paths. | |
318 | * | |
319 | * It is only legal to do this when the root will not change | |
320 | * on us. Otherwise we'll potentially lock the wrong qdisc | |
321 | * root. This is enforced by holding the RTNL semaphore, which | |
322 | * all users of this lock accessor must do. | |
323 | */ | |
05bdd2f1 | 324 | static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) |
7698b4fc DM |
325 | { |
326 | struct Qdisc *root = qdisc_root(qdisc); | |
327 | ||
7e43f112 | 328 | ASSERT_RTNL(); |
83874000 | 329 | return qdisc_lock(root); |
7698b4fc DM |
330 | } |
331 | ||
05bdd2f1 | 332 | static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
f6f9b93f JP |
333 | { |
334 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
335 | ||
336 | ASSERT_RTNL(); | |
337 | return qdisc_lock(root); | |
338 | } | |
339 | ||
edb09eb1 ED |
340 | static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) |
341 | { | |
342 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
343 | ||
344 | ASSERT_RTNL(); | |
345 | return &root->running; | |
346 | } | |
347 | ||
05bdd2f1 | 348 | static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) |
5ce2d488 DM |
349 | { |
350 | return qdisc->dev_queue->dev; | |
351 | } | |
1da177e4 | 352 | |
05bdd2f1 | 353 | static inline void sch_tree_lock(const struct Qdisc *q) |
78a5b30b | 354 | { |
fe439dd0 | 355 | spin_lock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
356 | } |
357 | ||
05bdd2f1 | 358 | static inline void sch_tree_unlock(const struct Qdisc *q) |
78a5b30b | 359 | { |
fe439dd0 | 360 | spin_unlock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
361 | } |
362 | ||
363 | #define tcf_tree_lock(tp) sch_tree_lock((tp)->q) | |
364 | #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q) | |
1da177e4 | 365 | |
e41a33e6 TG |
366 | extern struct Qdisc noop_qdisc; |
367 | extern struct Qdisc_ops noop_qdisc_ops; | |
6ec1c69a DM |
368 | extern struct Qdisc_ops pfifo_fast_ops; |
369 | extern struct Qdisc_ops mq_qdisc_ops; | |
d66d6c31 | 370 | extern struct Qdisc_ops noqueue_qdisc_ops; |
6da7c8fc | 371 | extern const struct Qdisc_ops *default_qdisc_ops; |
1f27cde3 ED |
372 | static inline const struct Qdisc_ops * |
373 | get_default_qdisc_ops(const struct net_device *dev, int ntx) | |
374 | { | |
375 | return ntx < dev->real_num_tx_queues ? | |
376 | default_qdisc_ops : &pfifo_fast_ops; | |
377 | } | |
e41a33e6 | 378 | |
fd2c3ef7 | 379 | struct Qdisc_class_common { |
6fe1c7a5 PM |
380 | u32 classid; |
381 | struct hlist_node hnode; | |
382 | }; | |
383 | ||
fd2c3ef7 | 384 | struct Qdisc_class_hash { |
6fe1c7a5 PM |
385 | struct hlist_head *hash; |
386 | unsigned int hashsize; | |
387 | unsigned int hashmask; | |
388 | unsigned int hashelems; | |
389 | }; | |
390 | ||
391 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
392 | { | |
393 | id ^= id >> 8; | |
394 | id ^= id >> 4; | |
395 | return id & mask; | |
396 | } | |
397 | ||
398 | static inline struct Qdisc_class_common * | |
05bdd2f1 | 399 | qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
6fe1c7a5 PM |
400 | { |
401 | struct Qdisc_class_common *cl; | |
6fe1c7a5 PM |
402 | unsigned int h; |
403 | ||
7d3f0cd4 GF |
404 | if (!id) |
405 | return NULL; | |
406 | ||
6fe1c7a5 | 407 | h = qdisc_class_hash(id, hash->hashmask); |
b67bfe0d | 408 | hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
6fe1c7a5 PM |
409 | if (cl->classid == id) |
410 | return cl; | |
411 | } | |
412 | return NULL; | |
413 | } | |
414 | ||
5c15257f JP |
415 | int qdisc_class_hash_init(struct Qdisc_class_hash *); |
416 | void qdisc_class_hash_insert(struct Qdisc_class_hash *, | |
417 | struct Qdisc_class_common *); | |
418 | void qdisc_class_hash_remove(struct Qdisc_class_hash *, | |
419 | struct Qdisc_class_common *); | |
420 | void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
421 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
422 | ||
423 | void dev_init_scheduler(struct net_device *dev); | |
424 | void dev_shutdown(struct net_device *dev); | |
425 | void dev_activate(struct net_device *dev); | |
426 | void dev_deactivate(struct net_device *dev); | |
427 | void dev_deactivate_many(struct list_head *head); | |
428 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
429 | struct Qdisc *qdisc); | |
430 | void qdisc_reset(struct Qdisc *qdisc); | |
431 | void qdisc_destroy(struct Qdisc *qdisc); | |
2ccccf5f WC |
432 | void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n, |
433 | unsigned int len); | |
5c15257f | 434 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d2a7f269 | 435 | const struct Qdisc_ops *ops); |
5c15257f | 436 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 437 | const struct Qdisc_ops *ops, u32 parentid); |
5c15257f JP |
438 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
439 | const struct qdisc_size_table *stab); | |
27b29f63 | 440 | int skb_do_redirect(struct sk_buff *); |
1da177e4 | 441 | |
a5135bcf WB |
442 | static inline void skb_reset_tc(struct sk_buff *skb) |
443 | { | |
444 | #ifdef CONFIG_NET_CLS_ACT | |
bc31c905 | 445 | skb->tc_redirected = 0; |
a5135bcf WB |
446 | #endif |
447 | } | |
448 | ||
fdc5432a DB |
449 | static inline bool skb_at_tc_ingress(const struct sk_buff *skb) |
450 | { | |
451 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 452 | return skb->tc_at_ingress; |
fdc5432a DB |
453 | #else |
454 | return false; | |
455 | #endif | |
456 | } | |
457 | ||
e7246e12 WB |
458 | static inline bool skb_skip_tc_classify(struct sk_buff *skb) |
459 | { | |
460 | #ifdef CONFIG_NET_CLS_ACT | |
461 | if (skb->tc_skip_classify) { | |
462 | skb->tc_skip_classify = 0; | |
463 | return true; | |
464 | } | |
465 | #endif | |
466 | return false; | |
467 | } | |
468 | ||
f0796d5c JF |
469 | /* Reset all TX qdiscs greater then index of a device. */ |
470 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) | |
5aa70995 | 471 | { |
4ef6acff JF |
472 | struct Qdisc *qdisc; |
473 | ||
f0796d5c | 474 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 475 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
476 | if (qdisc) { |
477 | spin_lock_bh(qdisc_lock(qdisc)); | |
478 | qdisc_reset(qdisc); | |
479 | spin_unlock_bh(qdisc_lock(qdisc)); | |
480 | } | |
481 | } | |
5aa70995 DM |
482 | } |
483 | ||
5aa70995 DM |
484 | static inline void qdisc_reset_all_tx(struct net_device *dev) |
485 | { | |
f0796d5c | 486 | qdisc_reset_all_tx_gt(dev, 0); |
5aa70995 DM |
487 | } |
488 | ||
3e745dd6 DM |
489 | /* Are all TX queues of the device empty? */ |
490 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
491 | { | |
e8a0464c | 492 | unsigned int i; |
46e5da40 JF |
493 | |
494 | rcu_read_lock(); | |
e8a0464c DM |
495 | for (i = 0; i < dev->num_tx_queues; i++) { |
496 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 497 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 498 | |
46e5da40 JF |
499 | if (q->q.qlen) { |
500 | rcu_read_unlock(); | |
e8a0464c | 501 | return false; |
46e5da40 | 502 | } |
e8a0464c | 503 | } |
46e5da40 | 504 | rcu_read_unlock(); |
e8a0464c | 505 | return true; |
3e745dd6 DM |
506 | } |
507 | ||
6fa9864b | 508 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 509 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 510 | { |
e8a0464c | 511 | unsigned int i; |
46e5da40 | 512 | |
e8a0464c DM |
513 | for (i = 0; i < dev->num_tx_queues; i++) { |
514 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 515 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
516 | return true; |
517 | } | |
518 | return false; | |
6fa9864b DM |
519 | } |
520 | ||
e8a0464c | 521 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
522 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
523 | { | |
e8a0464c | 524 | unsigned int i; |
46e5da40 | 525 | |
e8a0464c DM |
526 | for (i = 0; i < dev->num_tx_queues; i++) { |
527 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 528 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
e8a0464c DM |
529 | return false; |
530 | } | |
531 | return true; | |
05297949 DM |
532 | } |
533 | ||
bfe0d029 | 534 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 535 | { |
175f9c1b | 536 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
537 | } |
538 | ||
c27f339a | 539 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
540 | enum net_xmit_qdisc_t { |
541 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 542 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
543 | }; |
544 | ||
c27f339a | 545 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 546 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
547 | #else |
548 | #define net_xmit_drop_count(e) (1) | |
549 | #endif | |
550 | ||
a2da570d ED |
551 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
552 | const struct Qdisc *sch) | |
5f86173b | 553 | { |
3a682fbd | 554 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
555 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
556 | ||
557 | if (stab) | |
558 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 559 | #endif |
a2da570d ED |
560 | } |
561 | ||
520ac30f ED |
562 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
563 | struct sk_buff **to_free) | |
a2da570d ED |
564 | { |
565 | qdisc_calculate_pkt_len(skb, sch); | |
520ac30f | 566 | return sch->enqueue(skb, sch, to_free); |
5f86173b JK |
567 | } |
568 | ||
22e0f8b9 JF |
569 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
570 | { | |
571 | return q->flags & TCQ_F_CPUSTATS; | |
572 | } | |
bfe0d029 | 573 | |
38040702 AV |
574 | static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, |
575 | __u64 bytes, __u32 packets) | |
576 | { | |
577 | bstats->bytes += bytes; | |
578 | bstats->packets += packets; | |
579 | } | |
580 | ||
bfe0d029 ED |
581 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, |
582 | const struct sk_buff *skb) | |
583 | { | |
38040702 AV |
584 | _bstats_update(bstats, |
585 | qdisc_pkt_len(skb), | |
586 | skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); | |
587 | } | |
588 | ||
589 | static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, | |
590 | __u64 bytes, __u32 packets) | |
591 | { | |
592 | u64_stats_update_begin(&bstats->syncp); | |
593 | _bstats_update(&bstats->bstats, bytes, packets); | |
594 | u64_stats_update_end(&bstats->syncp); | |
bfe0d029 ED |
595 | } |
596 | ||
24ea591d ED |
597 | static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, |
598 | const struct sk_buff *skb) | |
22e0f8b9 | 599 | { |
22e0f8b9 JF |
600 | u64_stats_update_begin(&bstats->syncp); |
601 | bstats_update(&bstats->bstats, skb); | |
602 | u64_stats_update_end(&bstats->syncp); | |
603 | } | |
604 | ||
24ea591d ED |
605 | static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
606 | const struct sk_buff *skb) | |
607 | { | |
608 | bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); | |
609 | } | |
610 | ||
bfe0d029 ED |
611 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
612 | const struct sk_buff *skb) | |
bbd8a0d3 | 613 | { |
bfe0d029 | 614 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
615 | } |
616 | ||
25331d6c JF |
617 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
618 | const struct sk_buff *skb) | |
619 | { | |
620 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
621 | } | |
622 | ||
623 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, | |
624 | const struct sk_buff *skb) | |
625 | { | |
626 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
627 | } | |
628 | ||
629 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) | |
630 | { | |
631 | sch->qstats.drops += count; | |
632 | } | |
633 | ||
24ea591d | 634 | static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
25331d6c | 635 | { |
24ea591d | 636 | qstats->drops++; |
25331d6c JF |
637 | } |
638 | ||
24ea591d | 639 | static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
b0ab6f92 | 640 | { |
24ea591d ED |
641 | qstats->overlimits++; |
642 | } | |
b0ab6f92 | 643 | |
24ea591d ED |
644 | static inline void qdisc_qstats_drop(struct Qdisc *sch) |
645 | { | |
646 | qstats_drop_inc(&sch->qstats); | |
647 | } | |
648 | ||
649 | static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) | |
650 | { | |
eb60a8dd | 651 | this_cpu_inc(sch->cpu_qstats->drops); |
b0ab6f92 JF |
652 | } |
653 | ||
25331d6c JF |
654 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
655 | { | |
656 | sch->qstats.overlimits++; | |
657 | } | |
658 | ||
48da34b7 FW |
659 | static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh) |
660 | { | |
661 | qh->head = NULL; | |
662 | qh->tail = NULL; | |
663 | qh->qlen = 0; | |
664 | } | |
665 | ||
9972b25d | 666 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
48da34b7 | 667 | struct qdisc_skb_head *qh) |
9972b25d | 668 | { |
48da34b7 FW |
669 | struct sk_buff *last = qh->tail; |
670 | ||
671 | if (last) { | |
672 | skb->next = NULL; | |
673 | last->next = skb; | |
674 | qh->tail = skb; | |
675 | } else { | |
676 | qh->tail = skb; | |
677 | qh->head = skb; | |
678 | } | |
679 | qh->qlen++; | |
25331d6c | 680 | qdisc_qstats_backlog_inc(sch, skb); |
9972b25d TG |
681 | |
682 | return NET_XMIT_SUCCESS; | |
683 | } | |
684 | ||
685 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
686 | { | |
687 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
688 | } | |
689 | ||
48da34b7 | 690 | static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) |
9972b25d | 691 | { |
48da34b7 FW |
692 | struct sk_buff *skb = qh->head; |
693 | ||
694 | if (likely(skb != NULL)) { | |
695 | qh->head = skb->next; | |
696 | qh->qlen--; | |
697 | if (qh->head == NULL) | |
698 | qh->tail = NULL; | |
699 | skb->next = NULL; | |
700 | } | |
9972b25d | 701 | |
ec323368 FW |
702 | return skb; |
703 | } | |
704 | ||
705 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
706 | { | |
707 | struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); | |
708 | ||
9190b3b3 | 709 | if (likely(skb != NULL)) { |
25331d6c | 710 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
711 | qdisc_bstats_update(sch, skb); |
712 | } | |
9972b25d TG |
713 | |
714 | return skb; | |
715 | } | |
716 | ||
520ac30f ED |
717 | /* Instead of calling kfree_skb() while root qdisc lock is held, |
718 | * queue the skb for future freeing at end of __dev_xmit_skb() | |
719 | */ | |
720 | static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) | |
721 | { | |
722 | skb->next = *to_free; | |
723 | *to_free = skb; | |
724 | } | |
725 | ||
57dbb2d8 | 726 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, |
48da34b7 | 727 | struct qdisc_skb_head *qh, |
520ac30f | 728 | struct sk_buff **to_free) |
57dbb2d8 | 729 | { |
48da34b7 | 730 | struct sk_buff *skb = __qdisc_dequeue_head(qh); |
57dbb2d8 HPP |
731 | |
732 | if (likely(skb != NULL)) { | |
733 | unsigned int len = qdisc_pkt_len(skb); | |
520ac30f | 734 | |
25331d6c | 735 | qdisc_qstats_backlog_dec(sch, skb); |
520ac30f | 736 | __qdisc_drop(skb, to_free); |
57dbb2d8 HPP |
737 | return len; |
738 | } | |
739 | ||
740 | return 0; | |
741 | } | |
742 | ||
520ac30f ED |
743 | static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch, |
744 | struct sk_buff **to_free) | |
57dbb2d8 | 745 | { |
520ac30f | 746 | return __qdisc_queue_drop_head(sch, &sch->q, to_free); |
9972b25d TG |
747 | } |
748 | ||
48a8f519 PM |
749 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
750 | { | |
48da34b7 FW |
751 | const struct qdisc_skb_head *qh = &sch->q; |
752 | ||
753 | return qh->head; | |
48a8f519 PM |
754 | } |
755 | ||
77be155c JP |
756 | /* generic pseudo peek method for non-work-conserving qdisc */ |
757 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
758 | { | |
759 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ | |
61c9eaf9 | 760 | if (!sch->gso_skb) { |
77be155c | 761 | sch->gso_skb = sch->dequeue(sch); |
a27758ff | 762 | if (sch->gso_skb) { |
61c9eaf9 | 763 | /* it's still part of the queue */ |
a27758ff | 764 | qdisc_qstats_backlog_inc(sch, sch->gso_skb); |
61c9eaf9 | 765 | sch->q.qlen++; |
a27758ff | 766 | } |
61c9eaf9 | 767 | } |
77be155c JP |
768 | |
769 | return sch->gso_skb; | |
770 | } | |
771 | ||
772 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
773 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
774 | { | |
775 | struct sk_buff *skb = sch->gso_skb; | |
776 | ||
61c9eaf9 | 777 | if (skb) { |
77be155c | 778 | sch->gso_skb = NULL; |
a27758ff | 779 | qdisc_qstats_backlog_dec(sch, skb); |
61c9eaf9 JP |
780 | sch->q.qlen--; |
781 | } else { | |
77be155c | 782 | skb = sch->dequeue(sch); |
61c9eaf9 | 783 | } |
77be155c JP |
784 | |
785 | return skb; | |
786 | } | |
787 | ||
48da34b7 | 788 | static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) |
9972b25d TG |
789 | { |
790 | /* | |
791 | * We do not know the backlog in bytes of this list, it | |
792 | * is up to the caller to correct it | |
793 | */ | |
48da34b7 FW |
794 | ASSERT_RTNL(); |
795 | if (qh->qlen) { | |
796 | rtnl_kfree_skbs(qh->head, qh->tail); | |
797 | ||
798 | qh->head = NULL; | |
799 | qh->tail = NULL; | |
800 | qh->qlen = 0; | |
1b5c5493 | 801 | } |
9972b25d TG |
802 | } |
803 | ||
804 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
805 | { | |
1b5c5493 | 806 | __qdisc_reset_queue(&sch->q); |
9972b25d TG |
807 | sch->qstats.backlog = 0; |
808 | } | |
809 | ||
86a7996c WC |
810 | static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, |
811 | struct Qdisc **pold) | |
812 | { | |
813 | struct Qdisc *old; | |
814 | ||
815 | sch_tree_lock(sch); | |
816 | old = *pold; | |
817 | *pold = new; | |
818 | if (old != NULL) { | |
68a66d14 KK |
819 | unsigned int qlen = old->q.qlen; |
820 | unsigned int backlog = old->qstats.backlog; | |
821 | ||
86a7996c | 822 | qdisc_reset(old); |
68a66d14 | 823 | qdisc_tree_reduce_backlog(old, qlen, backlog); |
86a7996c WC |
824 | } |
825 | sch_tree_unlock(sch); | |
826 | ||
827 | return old; | |
828 | } | |
829 | ||
1b5c5493 ED |
830 | static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) |
831 | { | |
832 | rtnl_kfree_skbs(skb, skb); | |
833 | qdisc_qstats_drop(sch); | |
834 | } | |
835 | ||
520ac30f ED |
836 | |
837 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, | |
838 | struct sk_buff **to_free) | |
9972b25d | 839 | { |
520ac30f | 840 | __qdisc_drop(skb, to_free); |
25331d6c | 841 | qdisc_qstats_drop(sch); |
9972b25d TG |
842 | |
843 | return NET_XMIT_DROP; | |
844 | } | |
845 | ||
e9bef55d JDB |
846 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
847 | long it will take to send a packet given its size. | |
848 | */ | |
849 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
850 | { | |
e08b0998 JDB |
851 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
852 | if (slot < 0) | |
853 | slot = 0; | |
e9bef55d JDB |
854 | slot >>= rtab->rate.cell_log; |
855 | if (slot > 255) | |
a02cec21 | 856 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
857 | return rtab->data[slot]; |
858 | } | |
859 | ||
292f1c7f | 860 | struct psched_ratecfg { |
130d3d68 | 861 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
862 | u32 mult; |
863 | u16 overhead; | |
8a8e3d84 | 864 | u8 linklayer; |
01cb71d2 | 865 | u8 shift; |
292f1c7f JP |
866 | }; |
867 | ||
868 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
869 | unsigned int len) | |
870 | { | |
8a8e3d84 JDB |
871 | len += r->overhead; |
872 | ||
873 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
874 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
875 | ||
876 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
877 | } |
878 | ||
5c15257f | 879 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
880 | const struct tc_ratespec *conf, |
881 | u64 rate64); | |
292f1c7f | 882 | |
01cb71d2 ED |
883 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
884 | const struct psched_ratecfg *r) | |
292f1c7f | 885 | { |
01cb71d2 | 886 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
887 | |
888 | /* legacy struct tc_ratespec has a 32bit @rate field | |
889 | * Qdisc using 64bit rate should add new attributes | |
890 | * in order to maintain compatibility. | |
891 | */ | |
892 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
893 | ||
01cb71d2 | 894 | res->overhead = r->overhead; |
8a8e3d84 | 895 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
896 | } |
897 | ||
1da177e4 | 898 | #endif |