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> |
1da177e4 | 13 | #include <net/gen_stats.h> |
be577ddc | 14 | #include <net/rtnetlink.h> |
1da177e4 LT |
15 | |
16 | struct Qdisc_ops; | |
17 | struct qdisc_walker; | |
18 | struct tcf_walker; | |
19 | struct module; | |
20 | ||
fd2c3ef7 | 21 | struct qdisc_rate_table { |
1da177e4 LT |
22 | struct tc_ratespec rate; |
23 | u32 data[256]; | |
24 | struct qdisc_rate_table *next; | |
25 | int refcnt; | |
26 | }; | |
27 | ||
fd2c3ef7 | 28 | enum qdisc_state_t { |
37437bb2 | 29 | __QDISC_STATE_SCHED, |
a9312ae8 | 30 | __QDISC_STATE_DEACTIVATED, |
e2627c8c DM |
31 | }; |
32 | ||
175f9c1b | 33 | struct qdisc_size_table { |
a2da570d | 34 | struct rcu_head rcu; |
175f9c1b JK |
35 | struct list_head list; |
36 | struct tc_sizespec szopts; | |
37 | int refcnt; | |
38 | u16 data[]; | |
39 | }; | |
40 | ||
48da34b7 FW |
41 | /* similar to sk_buff_head, but skb->prev pointer is undefined. */ |
42 | struct qdisc_skb_head { | |
43 | struct sk_buff *head; | |
44 | struct sk_buff *tail; | |
45 | __u32 qlen; | |
46 | spinlock_t lock; | |
47 | }; | |
48 | ||
fd2c3ef7 | 49 | struct Qdisc { |
520ac30f ED |
50 | int (*enqueue)(struct sk_buff *skb, |
51 | struct Qdisc *sch, | |
52 | struct sk_buff **to_free); | |
53 | struct sk_buff * (*dequeue)(struct Qdisc *sch); | |
05bdd2f1 | 54 | unsigned int flags; |
b00355db | 55 | #define TCQ_F_BUILTIN 1 |
fd245a4a ED |
56 | #define TCQ_F_INGRESS 2 |
57 | #define TCQ_F_CAN_BYPASS 4 | |
58 | #define TCQ_F_MQROOT 8 | |
1abbe139 ED |
59 | #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for |
60 | * q->dev_queue : It can test | |
61 | * netif_xmit_frozen_or_stopped() before | |
62 | * dequeueing next packet. | |
63 | * Its true for MQ/MQPRIO slaves, or non | |
64 | * multiqueue device. | |
65 | */ | |
b00355db | 66 | #define TCQ_F_WARN_NONWC (1 << 16) |
22e0f8b9 | 67 | #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ |
4eaf3b84 ED |
68 | #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : |
69 | * qdisc_tree_decrease_qlen() should stop. | |
70 | */ | |
49b49971 | 71 | #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ |
45203a3b | 72 | u32 limit; |
05bdd2f1 | 73 | const struct Qdisc_ops *ops; |
a2da570d | 74 | struct qdisc_size_table __rcu *stab; |
59cc1f61 | 75 | struct hlist_node hash; |
1da177e4 LT |
76 | u32 handle; |
77 | u32 parent; | |
72b25a91 | 78 | |
5e140dfc | 79 | struct netdev_queue *dev_queue; |
5e140dfc | 80 | |
1c0d32fd | 81 | struct net_rate_estimator __rcu *rate_est; |
0d32ef8c ED |
82 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; |
83 | struct gnet_stats_queue __percpu *cpu_qstats; | |
84 | ||
5e140dfc ED |
85 | /* |
86 | * For performance sake on SMP, we put highly modified fields at the end | |
87 | */ | |
4d202a0d | 88 | struct sk_buff *gso_skb ____cacheline_aligned_in_smp; |
48da34b7 | 89 | struct qdisc_skb_head q; |
0d32ef8c | 90 | struct gnet_stats_basic_packed bstats; |
f9eb8aea | 91 | seqcount_t running; |
0d32ef8c | 92 | struct gnet_stats_queue qstats; |
4d202a0d ED |
93 | unsigned long state; |
94 | struct Qdisc *next_sched; | |
95 | struct sk_buff *skb_bad_txq; | |
79640a4c | 96 | struct rcu_head rcu_head; |
45203a3b | 97 | int padded; |
7b936405 | 98 | refcount_t refcnt; |
45203a3b ED |
99 | |
100 | spinlock_t busylock ____cacheline_aligned_in_smp; | |
1da177e4 LT |
101 | }; |
102 | ||
551143d8 ED |
103 | static inline void qdisc_refcount_inc(struct Qdisc *qdisc) |
104 | { | |
105 | if (qdisc->flags & TCQ_F_BUILTIN) | |
106 | return; | |
107 | refcount_inc(&qdisc->refcnt); | |
108 | } | |
109 | ||
fd245a4a | 110 | static inline bool qdisc_is_running(const struct Qdisc *qdisc) |
bc135b23 | 111 | { |
f9eb8aea | 112 | return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; |
bc135b23 ED |
113 | } |
114 | ||
115 | static inline bool qdisc_run_begin(struct Qdisc *qdisc) | |
116 | { | |
fd245a4a ED |
117 | if (qdisc_is_running(qdisc)) |
118 | return false; | |
52fbb290 ED |
119 | /* Variant of write_seqcount_begin() telling lockdep a trylock |
120 | * was attempted. | |
121 | */ | |
122 | raw_write_seqcount_begin(&qdisc->running); | |
123 | seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_); | |
fd245a4a | 124 | return true; |
bc135b23 ED |
125 | } |
126 | ||
127 | static inline void qdisc_run_end(struct Qdisc *qdisc) | |
128 | { | |
f9eb8aea | 129 | write_seqcount_end(&qdisc->running); |
fd245a4a ED |
130 | } |
131 | ||
5772e9a3 JDB |
132 | static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) |
133 | { | |
134 | return qdisc->flags & TCQ_F_ONETXQUEUE; | |
135 | } | |
136 | ||
137 | static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) | |
138 | { | |
139 | #ifdef CONFIG_BQL | |
140 | /* Non-BQL migrated drivers will return 0, too. */ | |
141 | return dql_avail(&txq->dql); | |
142 | #else | |
143 | return 0; | |
144 | #endif | |
145 | } | |
146 | ||
fd2c3ef7 | 147 | struct Qdisc_class_ops { |
1da177e4 | 148 | /* Child qdisc manipulation */ |
926e61b7 | 149 | struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); |
1da177e4 LT |
150 | int (*graft)(struct Qdisc *, unsigned long cl, |
151 | struct Qdisc *, struct Qdisc **); | |
152 | struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); | |
43effa1e | 153 | void (*qlen_notify)(struct Qdisc *, unsigned long); |
1da177e4 LT |
154 | |
155 | /* Class manipulation routines */ | |
143976ce | 156 | unsigned long (*find)(struct Qdisc *, u32 classid); |
1da177e4 | 157 | int (*change)(struct Qdisc *, u32, u32, |
1e90474c | 158 | struct nlattr **, unsigned long *); |
1da177e4 LT |
159 | int (*delete)(struct Qdisc *, unsigned long); |
160 | void (*walk)(struct Qdisc *, struct qdisc_walker * arg); | |
161 | ||
162 | /* Filter manipulation */ | |
6529eaba | 163 | struct tcf_block * (*tcf_block)(struct Qdisc *, unsigned long); |
1da177e4 LT |
164 | unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, |
165 | u32 classid); | |
166 | void (*unbind_tcf)(struct Qdisc *, unsigned long); | |
167 | ||
168 | /* rtnetlink specific */ | |
169 | int (*dump)(struct Qdisc *, unsigned long, | |
170 | struct sk_buff *skb, struct tcmsg*); | |
171 | int (*dump_stats)(struct Qdisc *, unsigned long, | |
172 | struct gnet_dump *); | |
173 | }; | |
174 | ||
fd2c3ef7 | 175 | struct Qdisc_ops { |
1da177e4 | 176 | struct Qdisc_ops *next; |
20fea08b | 177 | const struct Qdisc_class_ops *cl_ops; |
1da177e4 LT |
178 | char id[IFNAMSIZ]; |
179 | int priv_size; | |
180 | ||
520ac30f ED |
181 | int (*enqueue)(struct sk_buff *skb, |
182 | struct Qdisc *sch, | |
183 | struct sk_buff **to_free); | |
1da177e4 | 184 | struct sk_buff * (*dequeue)(struct Qdisc *); |
90d841fd | 185 | struct sk_buff * (*peek)(struct Qdisc *); |
1da177e4 | 186 | |
1e90474c | 187 | int (*init)(struct Qdisc *, struct nlattr *arg); |
1da177e4 LT |
188 | void (*reset)(struct Qdisc *); |
189 | void (*destroy)(struct Qdisc *); | |
1e90474c | 190 | int (*change)(struct Qdisc *, struct nlattr *arg); |
6ec1c69a | 191 | void (*attach)(struct Qdisc *); |
1da177e4 LT |
192 | |
193 | int (*dump)(struct Qdisc *, struct sk_buff *); | |
194 | int (*dump_stats)(struct Qdisc *, struct gnet_dump *); | |
195 | ||
196 | struct module *owner; | |
197 | }; | |
198 | ||
199 | ||
fd2c3ef7 | 200 | struct tcf_result { |
db50514f JP |
201 | union { |
202 | struct { | |
203 | unsigned long class; | |
204 | u32 classid; | |
205 | }; | |
206 | const struct tcf_proto *goto_tp; | |
207 | }; | |
1da177e4 LT |
208 | }; |
209 | ||
fd2c3ef7 | 210 | struct tcf_proto_ops { |
36272874 | 211 | struct list_head head; |
1da177e4 LT |
212 | char kind[IFNAMSIZ]; |
213 | ||
dc7f9f6e ED |
214 | int (*classify)(struct sk_buff *, |
215 | const struct tcf_proto *, | |
216 | struct tcf_result *); | |
1da177e4 | 217 | int (*init)(struct tcf_proto*); |
763dbf63 | 218 | void (*destroy)(struct tcf_proto*); |
1da177e4 | 219 | |
8113c095 | 220 | void* (*get)(struct tcf_proto*, u32 handle); |
c1b52739 | 221 | int (*change)(struct net *net, struct sk_buff *, |
af4c6641 | 222 | struct tcf_proto*, unsigned long, |
add93b61 | 223 | u32 handle, struct nlattr **, |
8113c095 WC |
224 | void **, bool); |
225 | int (*delete)(struct tcf_proto*, void *, bool*); | |
1da177e4 | 226 | void (*walk)(struct tcf_proto*, struct tcf_walker *arg); |
07d79fc7 | 227 | void (*bind_class)(void *, u32, unsigned long); |
1da177e4 LT |
228 | |
229 | /* rtnetlink specific */ | |
8113c095 | 230 | int (*dump)(struct net*, struct tcf_proto*, void *, |
1da177e4 LT |
231 | struct sk_buff *skb, struct tcmsg*); |
232 | ||
233 | struct module *owner; | |
234 | }; | |
235 | ||
fd2c3ef7 | 236 | struct tcf_proto { |
1da177e4 | 237 | /* Fast access part */ |
25d8c0d5 JF |
238 | struct tcf_proto __rcu *next; |
239 | void __rcu *root; | |
dc7f9f6e ED |
240 | int (*classify)(struct sk_buff *, |
241 | const struct tcf_proto *, | |
242 | struct tcf_result *); | |
66c6f529 | 243 | __be16 protocol; |
1da177e4 LT |
244 | |
245 | /* All the rest */ | |
246 | u32 prio; | |
247 | u32 classid; | |
248 | struct Qdisc *q; | |
249 | void *data; | |
dc7f9f6e | 250 | const struct tcf_proto_ops *ops; |
5bc17018 | 251 | struct tcf_chain *chain; |
25d8c0d5 | 252 | struct rcu_head rcu; |
1da177e4 LT |
253 | }; |
254 | ||
175f9c1b JK |
255 | struct qdisc_skb_cb { |
256 | unsigned int pkt_len; | |
df4ab5b3 | 257 | u16 slave_dev_queue_mapping; |
045efa82 | 258 | u16 tc_classid; |
25711786 ED |
259 | #define QDISC_CB_PRIV_LEN 20 |
260 | unsigned char data[QDISC_CB_PRIV_LEN]; | |
175f9c1b JK |
261 | }; |
262 | ||
2190d1d0 JP |
263 | struct tcf_chain { |
264 | struct tcf_proto __rcu *filter_chain; | |
6529eaba | 265 | struct tcf_proto __rcu **p_filter_chain; |
5bc17018 JP |
266 | struct list_head list; |
267 | struct tcf_block *block; | |
268 | u32 index; /* chain index */ | |
269 | unsigned int refcnt; | |
6529eaba JP |
270 | }; |
271 | ||
2190d1d0 | 272 | struct tcf_block { |
5bc17018 | 273 | struct list_head chain_list; |
2190d1d0 JP |
274 | }; |
275 | ||
16bda13d DM |
276 | static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
277 | { | |
278 | struct qdisc_skb_cb *qcb; | |
5ee31c68 ED |
279 | |
280 | BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); | |
16bda13d DM |
281 | BUILD_BUG_ON(sizeof(qcb->data) < sz); |
282 | } | |
283 | ||
05bdd2f1 | 284 | static inline int qdisc_qlen(const struct Qdisc *q) |
bbd8a0d3 KK |
285 | { |
286 | return q->q.qlen; | |
287 | } | |
288 | ||
bfe0d029 | 289 | static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
175f9c1b JK |
290 | { |
291 | return (struct qdisc_skb_cb *)skb->cb; | |
292 | } | |
293 | ||
83874000 DM |
294 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
295 | { | |
296 | return &qdisc->q.lock; | |
297 | } | |
298 | ||
05bdd2f1 | 299 | static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
7698b4fc | 300 | { |
46e5da40 JF |
301 | struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
302 | ||
303 | return q; | |
7698b4fc DM |
304 | } |
305 | ||
05bdd2f1 | 306 | static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
2540e051 JP |
307 | { |
308 | return qdisc->dev_queue->qdisc_sleeping; | |
309 | } | |
310 | ||
7e43f112 DM |
311 | /* The qdisc root lock is a mechanism by which to top level |
312 | * of a qdisc tree can be locked from any qdisc node in the | |
313 | * forest. This allows changing the configuration of some | |
314 | * aspect of the qdisc tree while blocking out asynchronous | |
315 | * qdisc access in the packet processing paths. | |
316 | * | |
317 | * It is only legal to do this when the root will not change | |
318 | * on us. Otherwise we'll potentially lock the wrong qdisc | |
319 | * root. This is enforced by holding the RTNL semaphore, which | |
320 | * all users of this lock accessor must do. | |
321 | */ | |
05bdd2f1 | 322 | static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) |
7698b4fc DM |
323 | { |
324 | struct Qdisc *root = qdisc_root(qdisc); | |
325 | ||
7e43f112 | 326 | ASSERT_RTNL(); |
83874000 | 327 | return qdisc_lock(root); |
7698b4fc DM |
328 | } |
329 | ||
05bdd2f1 | 330 | static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
f6f9b93f JP |
331 | { |
332 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
333 | ||
334 | ASSERT_RTNL(); | |
335 | return qdisc_lock(root); | |
336 | } | |
337 | ||
edb09eb1 ED |
338 | static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) |
339 | { | |
340 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
341 | ||
342 | ASSERT_RTNL(); | |
343 | return &root->running; | |
344 | } | |
345 | ||
05bdd2f1 | 346 | static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) |
5ce2d488 DM |
347 | { |
348 | return qdisc->dev_queue->dev; | |
349 | } | |
1da177e4 | 350 | |
05bdd2f1 | 351 | static inline void sch_tree_lock(const struct Qdisc *q) |
78a5b30b | 352 | { |
fe439dd0 | 353 | spin_lock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
354 | } |
355 | ||
05bdd2f1 | 356 | static inline void sch_tree_unlock(const struct Qdisc *q) |
78a5b30b | 357 | { |
fe439dd0 | 358 | spin_unlock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
359 | } |
360 | ||
361 | #define tcf_tree_lock(tp) sch_tree_lock((tp)->q) | |
362 | #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q) | |
1da177e4 | 363 | |
e41a33e6 TG |
364 | extern struct Qdisc noop_qdisc; |
365 | extern struct Qdisc_ops noop_qdisc_ops; | |
6ec1c69a DM |
366 | extern struct Qdisc_ops pfifo_fast_ops; |
367 | extern struct Qdisc_ops mq_qdisc_ops; | |
d66d6c31 | 368 | extern struct Qdisc_ops noqueue_qdisc_ops; |
6da7c8fc | 369 | extern const struct Qdisc_ops *default_qdisc_ops; |
1f27cde3 ED |
370 | static inline const struct Qdisc_ops * |
371 | get_default_qdisc_ops(const struct net_device *dev, int ntx) | |
372 | { | |
373 | return ntx < dev->real_num_tx_queues ? | |
374 | default_qdisc_ops : &pfifo_fast_ops; | |
375 | } | |
e41a33e6 | 376 | |
fd2c3ef7 | 377 | struct Qdisc_class_common { |
6fe1c7a5 PM |
378 | u32 classid; |
379 | struct hlist_node hnode; | |
380 | }; | |
381 | ||
fd2c3ef7 | 382 | struct Qdisc_class_hash { |
6fe1c7a5 PM |
383 | struct hlist_head *hash; |
384 | unsigned int hashsize; | |
385 | unsigned int hashmask; | |
386 | unsigned int hashelems; | |
387 | }; | |
388 | ||
389 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
390 | { | |
391 | id ^= id >> 8; | |
392 | id ^= id >> 4; | |
393 | return id & mask; | |
394 | } | |
395 | ||
396 | static inline struct Qdisc_class_common * | |
05bdd2f1 | 397 | qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
6fe1c7a5 PM |
398 | { |
399 | struct Qdisc_class_common *cl; | |
6fe1c7a5 PM |
400 | unsigned int h; |
401 | ||
7d3f0cd4 GF |
402 | if (!id) |
403 | return NULL; | |
404 | ||
6fe1c7a5 | 405 | h = qdisc_class_hash(id, hash->hashmask); |
b67bfe0d | 406 | hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
6fe1c7a5 PM |
407 | if (cl->classid == id) |
408 | return cl; | |
409 | } | |
410 | return NULL; | |
411 | } | |
412 | ||
5c15257f JP |
413 | int qdisc_class_hash_init(struct Qdisc_class_hash *); |
414 | void qdisc_class_hash_insert(struct Qdisc_class_hash *, | |
415 | struct Qdisc_class_common *); | |
416 | void qdisc_class_hash_remove(struct Qdisc_class_hash *, | |
417 | struct Qdisc_class_common *); | |
418 | void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
419 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
420 | ||
421 | void dev_init_scheduler(struct net_device *dev); | |
422 | void dev_shutdown(struct net_device *dev); | |
423 | void dev_activate(struct net_device *dev); | |
424 | void dev_deactivate(struct net_device *dev); | |
425 | void dev_deactivate_many(struct list_head *head); | |
426 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
427 | struct Qdisc *qdisc); | |
428 | void qdisc_reset(struct Qdisc *qdisc); | |
429 | void qdisc_destroy(struct Qdisc *qdisc); | |
2ccccf5f WC |
430 | void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n, |
431 | unsigned int len); | |
5c15257f | 432 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d2a7f269 | 433 | const struct Qdisc_ops *ops); |
5c15257f | 434 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 435 | const struct Qdisc_ops *ops, u32 parentid); |
5c15257f JP |
436 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
437 | const struct qdisc_size_table *stab); | |
27b29f63 | 438 | int skb_do_redirect(struct sk_buff *); |
1da177e4 | 439 | |
a5135bcf WB |
440 | static inline void skb_reset_tc(struct sk_buff *skb) |
441 | { | |
442 | #ifdef CONFIG_NET_CLS_ACT | |
bc31c905 | 443 | skb->tc_redirected = 0; |
a5135bcf WB |
444 | #endif |
445 | } | |
446 | ||
fdc5432a DB |
447 | static inline bool skb_at_tc_ingress(const struct sk_buff *skb) |
448 | { | |
449 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 450 | return skb->tc_at_ingress; |
fdc5432a DB |
451 | #else |
452 | return false; | |
453 | #endif | |
454 | } | |
455 | ||
e7246e12 WB |
456 | static inline bool skb_skip_tc_classify(struct sk_buff *skb) |
457 | { | |
458 | #ifdef CONFIG_NET_CLS_ACT | |
459 | if (skb->tc_skip_classify) { | |
460 | skb->tc_skip_classify = 0; | |
461 | return true; | |
462 | } | |
463 | #endif | |
464 | return false; | |
465 | } | |
466 | ||
f0796d5c JF |
467 | /* Reset all TX qdiscs greater then index of a device. */ |
468 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) | |
5aa70995 | 469 | { |
4ef6acff JF |
470 | struct Qdisc *qdisc; |
471 | ||
f0796d5c | 472 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 473 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
474 | if (qdisc) { |
475 | spin_lock_bh(qdisc_lock(qdisc)); | |
476 | qdisc_reset(qdisc); | |
477 | spin_unlock_bh(qdisc_lock(qdisc)); | |
478 | } | |
479 | } | |
5aa70995 DM |
480 | } |
481 | ||
5aa70995 DM |
482 | static inline void qdisc_reset_all_tx(struct net_device *dev) |
483 | { | |
f0796d5c | 484 | qdisc_reset_all_tx_gt(dev, 0); |
5aa70995 DM |
485 | } |
486 | ||
3e745dd6 DM |
487 | /* Are all TX queues of the device empty? */ |
488 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
489 | { | |
e8a0464c | 490 | unsigned int i; |
46e5da40 JF |
491 | |
492 | rcu_read_lock(); | |
e8a0464c DM |
493 | for (i = 0; i < dev->num_tx_queues; i++) { |
494 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 495 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 496 | |
46e5da40 JF |
497 | if (q->q.qlen) { |
498 | rcu_read_unlock(); | |
e8a0464c | 499 | return false; |
46e5da40 | 500 | } |
e8a0464c | 501 | } |
46e5da40 | 502 | rcu_read_unlock(); |
e8a0464c | 503 | return true; |
3e745dd6 DM |
504 | } |
505 | ||
6fa9864b | 506 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 507 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 508 | { |
e8a0464c | 509 | unsigned int i; |
46e5da40 | 510 | |
e8a0464c DM |
511 | for (i = 0; i < dev->num_tx_queues; i++) { |
512 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 513 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
514 | return true; |
515 | } | |
516 | return false; | |
6fa9864b DM |
517 | } |
518 | ||
e8a0464c | 519 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
520 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
521 | { | |
e8a0464c | 522 | unsigned int i; |
46e5da40 | 523 | |
e8a0464c DM |
524 | for (i = 0; i < dev->num_tx_queues; i++) { |
525 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 526 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
e8a0464c DM |
527 | return false; |
528 | } | |
529 | return true; | |
05297949 DM |
530 | } |
531 | ||
bfe0d029 | 532 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 533 | { |
175f9c1b | 534 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
535 | } |
536 | ||
c27f339a | 537 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
538 | enum net_xmit_qdisc_t { |
539 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 540 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
541 | }; |
542 | ||
c27f339a | 543 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 544 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
545 | #else |
546 | #define net_xmit_drop_count(e) (1) | |
547 | #endif | |
548 | ||
a2da570d ED |
549 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
550 | const struct Qdisc *sch) | |
5f86173b | 551 | { |
3a682fbd | 552 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
553 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
554 | ||
555 | if (stab) | |
556 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 557 | #endif |
a2da570d ED |
558 | } |
559 | ||
520ac30f ED |
560 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
561 | struct sk_buff **to_free) | |
a2da570d ED |
562 | { |
563 | qdisc_calculate_pkt_len(skb, sch); | |
520ac30f | 564 | return sch->enqueue(skb, sch, to_free); |
5f86173b JK |
565 | } |
566 | ||
22e0f8b9 JF |
567 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
568 | { | |
569 | return q->flags & TCQ_F_CPUSTATS; | |
570 | } | |
bfe0d029 | 571 | |
38040702 AV |
572 | static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, |
573 | __u64 bytes, __u32 packets) | |
574 | { | |
575 | bstats->bytes += bytes; | |
576 | bstats->packets += packets; | |
577 | } | |
578 | ||
bfe0d029 ED |
579 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, |
580 | const struct sk_buff *skb) | |
581 | { | |
38040702 AV |
582 | _bstats_update(bstats, |
583 | qdisc_pkt_len(skb), | |
584 | skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); | |
585 | } | |
586 | ||
587 | static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, | |
588 | __u64 bytes, __u32 packets) | |
589 | { | |
590 | u64_stats_update_begin(&bstats->syncp); | |
591 | _bstats_update(&bstats->bstats, bytes, packets); | |
592 | u64_stats_update_end(&bstats->syncp); | |
bfe0d029 ED |
593 | } |
594 | ||
24ea591d ED |
595 | static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, |
596 | const struct sk_buff *skb) | |
22e0f8b9 | 597 | { |
22e0f8b9 JF |
598 | u64_stats_update_begin(&bstats->syncp); |
599 | bstats_update(&bstats->bstats, skb); | |
600 | u64_stats_update_end(&bstats->syncp); | |
601 | } | |
602 | ||
24ea591d ED |
603 | static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
604 | const struct sk_buff *skb) | |
605 | { | |
606 | bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); | |
607 | } | |
608 | ||
bfe0d029 ED |
609 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
610 | const struct sk_buff *skb) | |
bbd8a0d3 | 611 | { |
bfe0d029 | 612 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
613 | } |
614 | ||
25331d6c JF |
615 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
616 | const struct sk_buff *skb) | |
617 | { | |
618 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
619 | } | |
620 | ||
621 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, | |
622 | const struct sk_buff *skb) | |
623 | { | |
624 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
625 | } | |
626 | ||
627 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) | |
628 | { | |
629 | sch->qstats.drops += count; | |
630 | } | |
631 | ||
24ea591d | 632 | static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
25331d6c | 633 | { |
24ea591d | 634 | qstats->drops++; |
25331d6c JF |
635 | } |
636 | ||
24ea591d | 637 | static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
b0ab6f92 | 638 | { |
24ea591d ED |
639 | qstats->overlimits++; |
640 | } | |
b0ab6f92 | 641 | |
24ea591d ED |
642 | static inline void qdisc_qstats_drop(struct Qdisc *sch) |
643 | { | |
644 | qstats_drop_inc(&sch->qstats); | |
645 | } | |
646 | ||
647 | static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) | |
648 | { | |
eb60a8dd | 649 | this_cpu_inc(sch->cpu_qstats->drops); |
b0ab6f92 JF |
650 | } |
651 | ||
25331d6c JF |
652 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
653 | { | |
654 | sch->qstats.overlimits++; | |
655 | } | |
656 | ||
48da34b7 FW |
657 | static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh) |
658 | { | |
659 | qh->head = NULL; | |
660 | qh->tail = NULL; | |
661 | qh->qlen = 0; | |
662 | } | |
663 | ||
9972b25d | 664 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
48da34b7 | 665 | struct qdisc_skb_head *qh) |
9972b25d | 666 | { |
48da34b7 FW |
667 | struct sk_buff *last = qh->tail; |
668 | ||
669 | if (last) { | |
670 | skb->next = NULL; | |
671 | last->next = skb; | |
672 | qh->tail = skb; | |
673 | } else { | |
674 | qh->tail = skb; | |
675 | qh->head = skb; | |
676 | } | |
677 | qh->qlen++; | |
25331d6c | 678 | qdisc_qstats_backlog_inc(sch, skb); |
9972b25d TG |
679 | |
680 | return NET_XMIT_SUCCESS; | |
681 | } | |
682 | ||
683 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
684 | { | |
685 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
686 | } | |
687 | ||
48da34b7 | 688 | static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) |
9972b25d | 689 | { |
48da34b7 FW |
690 | struct sk_buff *skb = qh->head; |
691 | ||
692 | if (likely(skb != NULL)) { | |
693 | qh->head = skb->next; | |
694 | qh->qlen--; | |
695 | if (qh->head == NULL) | |
696 | qh->tail = NULL; | |
697 | skb->next = NULL; | |
698 | } | |
9972b25d | 699 | |
ec323368 FW |
700 | return skb; |
701 | } | |
702 | ||
703 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
704 | { | |
705 | struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); | |
706 | ||
9190b3b3 | 707 | if (likely(skb != NULL)) { |
25331d6c | 708 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
709 | qdisc_bstats_update(sch, skb); |
710 | } | |
9972b25d TG |
711 | |
712 | return skb; | |
713 | } | |
714 | ||
520ac30f ED |
715 | /* Instead of calling kfree_skb() while root qdisc lock is held, |
716 | * queue the skb for future freeing at end of __dev_xmit_skb() | |
717 | */ | |
718 | static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) | |
719 | { | |
720 | skb->next = *to_free; | |
721 | *to_free = skb; | |
722 | } | |
723 | ||
57dbb2d8 | 724 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, |
48da34b7 | 725 | struct qdisc_skb_head *qh, |
520ac30f | 726 | struct sk_buff **to_free) |
57dbb2d8 | 727 | { |
48da34b7 | 728 | struct sk_buff *skb = __qdisc_dequeue_head(qh); |
57dbb2d8 HPP |
729 | |
730 | if (likely(skb != NULL)) { | |
731 | unsigned int len = qdisc_pkt_len(skb); | |
520ac30f | 732 | |
25331d6c | 733 | qdisc_qstats_backlog_dec(sch, skb); |
520ac30f | 734 | __qdisc_drop(skb, to_free); |
57dbb2d8 HPP |
735 | return len; |
736 | } | |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
520ac30f ED |
741 | static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch, |
742 | struct sk_buff **to_free) | |
57dbb2d8 | 743 | { |
520ac30f | 744 | return __qdisc_queue_drop_head(sch, &sch->q, to_free); |
9972b25d TG |
745 | } |
746 | ||
48a8f519 PM |
747 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
748 | { | |
48da34b7 FW |
749 | const struct qdisc_skb_head *qh = &sch->q; |
750 | ||
751 | return qh->head; | |
48a8f519 PM |
752 | } |
753 | ||
77be155c JP |
754 | /* generic pseudo peek method for non-work-conserving qdisc */ |
755 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
756 | { | |
757 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ | |
61c9eaf9 | 758 | if (!sch->gso_skb) { |
77be155c | 759 | sch->gso_skb = sch->dequeue(sch); |
a27758ff | 760 | if (sch->gso_skb) { |
61c9eaf9 | 761 | /* it's still part of the queue */ |
a27758ff | 762 | qdisc_qstats_backlog_inc(sch, sch->gso_skb); |
61c9eaf9 | 763 | sch->q.qlen++; |
a27758ff | 764 | } |
61c9eaf9 | 765 | } |
77be155c JP |
766 | |
767 | return sch->gso_skb; | |
768 | } | |
769 | ||
770 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
771 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
772 | { | |
773 | struct sk_buff *skb = sch->gso_skb; | |
774 | ||
61c9eaf9 | 775 | if (skb) { |
77be155c | 776 | sch->gso_skb = NULL; |
a27758ff | 777 | qdisc_qstats_backlog_dec(sch, skb); |
61c9eaf9 JP |
778 | sch->q.qlen--; |
779 | } else { | |
77be155c | 780 | skb = sch->dequeue(sch); |
61c9eaf9 | 781 | } |
77be155c JP |
782 | |
783 | return skb; | |
784 | } | |
785 | ||
48da34b7 | 786 | static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) |
9972b25d TG |
787 | { |
788 | /* | |
789 | * We do not know the backlog in bytes of this list, it | |
790 | * is up to the caller to correct it | |
791 | */ | |
48da34b7 FW |
792 | ASSERT_RTNL(); |
793 | if (qh->qlen) { | |
794 | rtnl_kfree_skbs(qh->head, qh->tail); | |
795 | ||
796 | qh->head = NULL; | |
797 | qh->tail = NULL; | |
798 | qh->qlen = 0; | |
1b5c5493 | 799 | } |
9972b25d TG |
800 | } |
801 | ||
802 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
803 | { | |
1b5c5493 | 804 | __qdisc_reset_queue(&sch->q); |
9972b25d TG |
805 | sch->qstats.backlog = 0; |
806 | } | |
807 | ||
86a7996c WC |
808 | static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, |
809 | struct Qdisc **pold) | |
810 | { | |
811 | struct Qdisc *old; | |
812 | ||
813 | sch_tree_lock(sch); | |
814 | old = *pold; | |
815 | *pold = new; | |
816 | if (old != NULL) { | |
68a66d14 KK |
817 | unsigned int qlen = old->q.qlen; |
818 | unsigned int backlog = old->qstats.backlog; | |
819 | ||
86a7996c | 820 | qdisc_reset(old); |
68a66d14 | 821 | qdisc_tree_reduce_backlog(old, qlen, backlog); |
86a7996c WC |
822 | } |
823 | sch_tree_unlock(sch); | |
824 | ||
825 | return old; | |
826 | } | |
827 | ||
1b5c5493 ED |
828 | static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) |
829 | { | |
830 | rtnl_kfree_skbs(skb, skb); | |
831 | qdisc_qstats_drop(sch); | |
832 | } | |
833 | ||
520ac30f ED |
834 | |
835 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, | |
836 | struct sk_buff **to_free) | |
9972b25d | 837 | { |
520ac30f | 838 | __qdisc_drop(skb, to_free); |
25331d6c | 839 | qdisc_qstats_drop(sch); |
9972b25d TG |
840 | |
841 | return NET_XMIT_DROP; | |
842 | } | |
843 | ||
e9bef55d JDB |
844 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
845 | long it will take to send a packet given its size. | |
846 | */ | |
847 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
848 | { | |
e08b0998 JDB |
849 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
850 | if (slot < 0) | |
851 | slot = 0; | |
e9bef55d JDB |
852 | slot >>= rtab->rate.cell_log; |
853 | if (slot > 255) | |
a02cec21 | 854 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
855 | return rtab->data[slot]; |
856 | } | |
857 | ||
292f1c7f | 858 | struct psched_ratecfg { |
130d3d68 | 859 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
860 | u32 mult; |
861 | u16 overhead; | |
8a8e3d84 | 862 | u8 linklayer; |
01cb71d2 | 863 | u8 shift; |
292f1c7f JP |
864 | }; |
865 | ||
866 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
867 | unsigned int len) | |
868 | { | |
8a8e3d84 JDB |
869 | len += r->overhead; |
870 | ||
871 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
872 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
873 | ||
874 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
875 | } |
876 | ||
5c15257f | 877 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
878 | const struct tc_ratespec *conf, |
879 | u64 rate64); | |
292f1c7f | 880 | |
01cb71d2 ED |
881 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
882 | const struct psched_ratecfg *r) | |
292f1c7f | 883 | { |
01cb71d2 | 884 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
885 | |
886 | /* legacy struct tc_ratespec has a 32bit @rate field | |
887 | * Qdisc using 64bit rate should add new attributes | |
888 | * in order to maintain compatibility. | |
889 | */ | |
890 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
891 | ||
01cb71d2 | 892 | res->overhead = r->overhead; |
8a8e3d84 | 893 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
894 | } |
895 | ||
1da177e4 | 896 | #endif |