Commit | Line | Data |
---|---|---|
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> |
1da177e4 | 11 | #include <net/gen_stats.h> |
be577ddc | 12 | #include <net/rtnetlink.h> |
1da177e4 LT |
13 | |
14 | struct Qdisc_ops; | |
15 | struct qdisc_walker; | |
16 | struct tcf_walker; | |
17 | struct module; | |
18 | ||
fd2c3ef7 | 19 | struct qdisc_rate_table { |
1da177e4 LT |
20 | struct tc_ratespec rate; |
21 | u32 data[256]; | |
22 | struct qdisc_rate_table *next; | |
23 | int refcnt; | |
24 | }; | |
25 | ||
fd2c3ef7 | 26 | enum qdisc_state_t { |
37437bb2 | 27 | __QDISC_STATE_SCHED, |
a9312ae8 | 28 | __QDISC_STATE_DEACTIVATED, |
ef352e7c | 29 | __QDISC_STATE_THROTTLED, |
e2627c8c DM |
30 | }; |
31 | ||
175f9c1b | 32 | struct qdisc_size_table { |
a2da570d | 33 | struct rcu_head rcu; |
175f9c1b JK |
34 | struct list_head list; |
35 | struct tc_sizespec szopts; | |
36 | int refcnt; | |
37 | u16 data[]; | |
38 | }; | |
39 | ||
fd2c3ef7 | 40 | struct Qdisc { |
1da177e4 LT |
41 | int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev); |
42 | struct sk_buff * (*dequeue)(struct Qdisc *dev); | |
05bdd2f1 | 43 | unsigned int flags; |
b00355db | 44 | #define TCQ_F_BUILTIN 1 |
fd245a4a ED |
45 | #define TCQ_F_INGRESS 2 |
46 | #define TCQ_F_CAN_BYPASS 4 | |
47 | #define TCQ_F_MQROOT 8 | |
1abbe139 ED |
48 | #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for |
49 | * q->dev_queue : It can test | |
50 | * netif_xmit_frozen_or_stopped() before | |
51 | * dequeueing next packet. | |
52 | * Its true for MQ/MQPRIO slaves, or non | |
53 | * multiqueue device. | |
54 | */ | |
b00355db | 55 | #define TCQ_F_WARN_NONWC (1 << 16) |
22e0f8b9 | 56 | #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ |
4eaf3b84 ED |
57 | #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : |
58 | * qdisc_tree_decrease_qlen() should stop. | |
59 | */ | |
45203a3b | 60 | u32 limit; |
05bdd2f1 | 61 | const struct Qdisc_ops *ops; |
a2da570d | 62 | struct qdisc_size_table __rcu *stab; |
5e140dfc | 63 | struct list_head list; |
1da177e4 LT |
64 | u32 handle; |
65 | u32 parent; | |
72b25a91 DM |
66 | void *u32_node; |
67 | ||
5e140dfc | 68 | struct netdev_queue *dev_queue; |
5e140dfc | 69 | |
45203a3b | 70 | struct gnet_stats_rate_est64 rate_est; |
0d32ef8c ED |
71 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; |
72 | struct gnet_stats_queue __percpu *cpu_qstats; | |
73 | ||
5e140dfc ED |
74 | /* |
75 | * For performance sake on SMP, we put highly modified fields at the end | |
76 | */ | |
c8945043 FW |
77 | struct Qdisc *next_sched ____cacheline_aligned_in_smp; |
78 | struct sk_buff *gso_skb; | |
5e140dfc ED |
79 | unsigned long state; |
80 | struct sk_buff_head q; | |
0d32ef8c | 81 | struct gnet_stats_basic_packed bstats; |
f9eb8aea | 82 | seqcount_t running; |
0d32ef8c | 83 | struct gnet_stats_queue qstats; |
79640a4c | 84 | struct rcu_head rcu_head; |
45203a3b ED |
85 | int padded; |
86 | atomic_t refcnt; | |
87 | ||
88 | spinlock_t busylock ____cacheline_aligned_in_smp; | |
1da177e4 LT |
89 | }; |
90 | ||
fd245a4a | 91 | static inline bool qdisc_is_running(const struct Qdisc *qdisc) |
bc135b23 | 92 | { |
f9eb8aea | 93 | return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; |
bc135b23 ED |
94 | } |
95 | ||
96 | static inline bool qdisc_run_begin(struct Qdisc *qdisc) | |
97 | { | |
fd245a4a ED |
98 | if (qdisc_is_running(qdisc)) |
99 | return false; | |
52fbb290 ED |
100 | /* Variant of write_seqcount_begin() telling lockdep a trylock |
101 | * was attempted. | |
102 | */ | |
103 | raw_write_seqcount_begin(&qdisc->running); | |
104 | seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_); | |
fd245a4a | 105 | return true; |
bc135b23 ED |
106 | } |
107 | ||
108 | static inline void qdisc_run_end(struct Qdisc *qdisc) | |
109 | { | |
f9eb8aea | 110 | write_seqcount_end(&qdisc->running); |
fd245a4a ED |
111 | } |
112 | ||
5772e9a3 JDB |
113 | static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) |
114 | { | |
115 | return qdisc->flags & TCQ_F_ONETXQUEUE; | |
116 | } | |
117 | ||
118 | static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) | |
119 | { | |
120 | #ifdef CONFIG_BQL | |
121 | /* Non-BQL migrated drivers will return 0, too. */ | |
122 | return dql_avail(&txq->dql); | |
123 | #else | |
124 | return 0; | |
125 | #endif | |
126 | } | |
127 | ||
fd245a4a ED |
128 | static inline bool qdisc_is_throttled(const struct Qdisc *qdisc) |
129 | { | |
ef352e7c | 130 | return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false; |
fd245a4a ED |
131 | } |
132 | ||
133 | static inline void qdisc_throttled(struct Qdisc *qdisc) | |
134 | { | |
ef352e7c | 135 | set_bit(__QDISC_STATE_THROTTLED, &qdisc->state); |
fd245a4a ED |
136 | } |
137 | ||
138 | static inline void qdisc_unthrottled(struct Qdisc *qdisc) | |
139 | { | |
ef352e7c | 140 | clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state); |
bc135b23 ED |
141 | } |
142 | ||
fd2c3ef7 | 143 | struct Qdisc_class_ops { |
1da177e4 | 144 | /* Child qdisc manipulation */ |
926e61b7 | 145 | struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); |
1da177e4 LT |
146 | int (*graft)(struct Qdisc *, unsigned long cl, |
147 | struct Qdisc *, struct Qdisc **); | |
148 | struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); | |
43effa1e | 149 | void (*qlen_notify)(struct Qdisc *, unsigned long); |
1da177e4 LT |
150 | |
151 | /* Class manipulation routines */ | |
152 | unsigned long (*get)(struct Qdisc *, u32 classid); | |
153 | void (*put)(struct Qdisc *, unsigned long); | |
154 | int (*change)(struct Qdisc *, u32, u32, | |
1e90474c | 155 | struct nlattr **, unsigned long *); |
1da177e4 LT |
156 | int (*delete)(struct Qdisc *, unsigned long); |
157 | void (*walk)(struct Qdisc *, struct qdisc_walker * arg); | |
158 | ||
159 | /* Filter manipulation */ | |
25d8c0d5 | 160 | struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long); |
1da177e4 LT |
161 | unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, |
162 | u32 classid); | |
163 | void (*unbind_tcf)(struct Qdisc *, unsigned long); | |
164 | ||
165 | /* rtnetlink specific */ | |
166 | int (*dump)(struct Qdisc *, unsigned long, | |
167 | struct sk_buff *skb, struct tcmsg*); | |
168 | int (*dump_stats)(struct Qdisc *, unsigned long, | |
169 | struct gnet_dump *); | |
170 | }; | |
171 | ||
fd2c3ef7 | 172 | struct Qdisc_ops { |
1da177e4 | 173 | struct Qdisc_ops *next; |
20fea08b | 174 | const struct Qdisc_class_ops *cl_ops; |
1da177e4 LT |
175 | char id[IFNAMSIZ]; |
176 | int priv_size; | |
177 | ||
178 | int (*enqueue)(struct sk_buff *, struct Qdisc *); | |
179 | struct sk_buff * (*dequeue)(struct Qdisc *); | |
90d841fd | 180 | struct sk_buff * (*peek)(struct Qdisc *); |
1da177e4 | 181 | |
1e90474c | 182 | int (*init)(struct Qdisc *, struct nlattr *arg); |
1da177e4 LT |
183 | void (*reset)(struct Qdisc *); |
184 | void (*destroy)(struct Qdisc *); | |
1e90474c | 185 | int (*change)(struct Qdisc *, struct nlattr *arg); |
6ec1c69a | 186 | void (*attach)(struct Qdisc *); |
1da177e4 LT |
187 | |
188 | int (*dump)(struct Qdisc *, struct sk_buff *); | |
189 | int (*dump_stats)(struct Qdisc *, struct gnet_dump *); | |
190 | ||
191 | struct module *owner; | |
192 | }; | |
193 | ||
194 | ||
fd2c3ef7 | 195 | struct tcf_result { |
1da177e4 LT |
196 | unsigned long class; |
197 | u32 classid; | |
198 | }; | |
199 | ||
fd2c3ef7 | 200 | struct tcf_proto_ops { |
36272874 | 201 | struct list_head head; |
1da177e4 LT |
202 | char kind[IFNAMSIZ]; |
203 | ||
dc7f9f6e ED |
204 | int (*classify)(struct sk_buff *, |
205 | const struct tcf_proto *, | |
206 | struct tcf_result *); | |
1da177e4 | 207 | int (*init)(struct tcf_proto*); |
1e052be6 | 208 | bool (*destroy)(struct tcf_proto*, bool); |
1da177e4 LT |
209 | |
210 | unsigned long (*get)(struct tcf_proto*, u32 handle); | |
c1b52739 | 211 | int (*change)(struct net *net, struct sk_buff *, |
af4c6641 | 212 | struct tcf_proto*, unsigned long, |
add93b61 | 213 | u32 handle, struct nlattr **, |
2f7ef2f8 | 214 | unsigned long *, bool); |
1da177e4 LT |
215 | int (*delete)(struct tcf_proto*, unsigned long); |
216 | void (*walk)(struct tcf_proto*, struct tcf_walker *arg); | |
217 | ||
218 | /* rtnetlink specific */ | |
832d1d5b | 219 | int (*dump)(struct net*, struct tcf_proto*, unsigned long, |
1da177e4 LT |
220 | struct sk_buff *skb, struct tcmsg*); |
221 | ||
222 | struct module *owner; | |
223 | }; | |
224 | ||
fd2c3ef7 | 225 | struct tcf_proto { |
1da177e4 | 226 | /* Fast access part */ |
25d8c0d5 JF |
227 | struct tcf_proto __rcu *next; |
228 | void __rcu *root; | |
dc7f9f6e ED |
229 | int (*classify)(struct sk_buff *, |
230 | const struct tcf_proto *, | |
231 | struct tcf_result *); | |
66c6f529 | 232 | __be16 protocol; |
1da177e4 LT |
233 | |
234 | /* All the rest */ | |
235 | u32 prio; | |
236 | u32 classid; | |
237 | struct Qdisc *q; | |
238 | void *data; | |
dc7f9f6e | 239 | const struct tcf_proto_ops *ops; |
25d8c0d5 | 240 | struct rcu_head rcu; |
1da177e4 LT |
241 | }; |
242 | ||
175f9c1b JK |
243 | struct qdisc_skb_cb { |
244 | unsigned int pkt_len; | |
df4ab5b3 | 245 | u16 slave_dev_queue_mapping; |
045efa82 | 246 | u16 tc_classid; |
25711786 ED |
247 | #define QDISC_CB_PRIV_LEN 20 |
248 | unsigned char data[QDISC_CB_PRIV_LEN]; | |
175f9c1b JK |
249 | }; |
250 | ||
16bda13d DM |
251 | static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
252 | { | |
253 | struct qdisc_skb_cb *qcb; | |
5ee31c68 ED |
254 | |
255 | BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); | |
16bda13d DM |
256 | BUILD_BUG_ON(sizeof(qcb->data) < sz); |
257 | } | |
258 | ||
05bdd2f1 | 259 | static inline int qdisc_qlen(const struct Qdisc *q) |
bbd8a0d3 KK |
260 | { |
261 | return q->q.qlen; | |
262 | } | |
263 | ||
bfe0d029 | 264 | static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
175f9c1b JK |
265 | { |
266 | return (struct qdisc_skb_cb *)skb->cb; | |
267 | } | |
268 | ||
83874000 DM |
269 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
270 | { | |
271 | return &qdisc->q.lock; | |
272 | } | |
273 | ||
05bdd2f1 | 274 | static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
7698b4fc | 275 | { |
46e5da40 JF |
276 | struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
277 | ||
278 | return q; | |
7698b4fc DM |
279 | } |
280 | ||
05bdd2f1 | 281 | static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
2540e051 JP |
282 | { |
283 | return qdisc->dev_queue->qdisc_sleeping; | |
284 | } | |
285 | ||
7e43f112 DM |
286 | /* The qdisc root lock is a mechanism by which to top level |
287 | * of a qdisc tree can be locked from any qdisc node in the | |
288 | * forest. This allows changing the configuration of some | |
289 | * aspect of the qdisc tree while blocking out asynchronous | |
290 | * qdisc access in the packet processing paths. | |
291 | * | |
292 | * It is only legal to do this when the root will not change | |
293 | * on us. Otherwise we'll potentially lock the wrong qdisc | |
294 | * root. This is enforced by holding the RTNL semaphore, which | |
295 | * all users of this lock accessor must do. | |
296 | */ | |
05bdd2f1 | 297 | static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) |
7698b4fc DM |
298 | { |
299 | struct Qdisc *root = qdisc_root(qdisc); | |
300 | ||
7e43f112 | 301 | ASSERT_RTNL(); |
83874000 | 302 | return qdisc_lock(root); |
7698b4fc DM |
303 | } |
304 | ||
05bdd2f1 | 305 | static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
f6f9b93f JP |
306 | { |
307 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
308 | ||
309 | ASSERT_RTNL(); | |
310 | return qdisc_lock(root); | |
311 | } | |
312 | ||
edb09eb1 ED |
313 | static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) |
314 | { | |
315 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
316 | ||
317 | ASSERT_RTNL(); | |
318 | return &root->running; | |
319 | } | |
320 | ||
05bdd2f1 | 321 | static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) |
5ce2d488 DM |
322 | { |
323 | return qdisc->dev_queue->dev; | |
324 | } | |
1da177e4 | 325 | |
05bdd2f1 | 326 | static inline void sch_tree_lock(const struct Qdisc *q) |
78a5b30b | 327 | { |
fe439dd0 | 328 | spin_lock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
329 | } |
330 | ||
05bdd2f1 | 331 | static inline void sch_tree_unlock(const struct Qdisc *q) |
78a5b30b | 332 | { |
fe439dd0 | 333 | spin_unlock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
334 | } |
335 | ||
336 | #define tcf_tree_lock(tp) sch_tree_lock((tp)->q) | |
337 | #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q) | |
1da177e4 | 338 | |
e41a33e6 TG |
339 | extern struct Qdisc noop_qdisc; |
340 | extern struct Qdisc_ops noop_qdisc_ops; | |
6ec1c69a DM |
341 | extern struct Qdisc_ops pfifo_fast_ops; |
342 | extern struct Qdisc_ops mq_qdisc_ops; | |
d66d6c31 | 343 | extern struct Qdisc_ops noqueue_qdisc_ops; |
6da7c8fc | 344 | extern const struct Qdisc_ops *default_qdisc_ops; |
1f27cde3 ED |
345 | static inline const struct Qdisc_ops * |
346 | get_default_qdisc_ops(const struct net_device *dev, int ntx) | |
347 | { | |
348 | return ntx < dev->real_num_tx_queues ? | |
349 | default_qdisc_ops : &pfifo_fast_ops; | |
350 | } | |
e41a33e6 | 351 | |
fd2c3ef7 | 352 | struct Qdisc_class_common { |
6fe1c7a5 PM |
353 | u32 classid; |
354 | struct hlist_node hnode; | |
355 | }; | |
356 | ||
fd2c3ef7 | 357 | struct Qdisc_class_hash { |
6fe1c7a5 PM |
358 | struct hlist_head *hash; |
359 | unsigned int hashsize; | |
360 | unsigned int hashmask; | |
361 | unsigned int hashelems; | |
362 | }; | |
363 | ||
364 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
365 | { | |
366 | id ^= id >> 8; | |
367 | id ^= id >> 4; | |
368 | return id & mask; | |
369 | } | |
370 | ||
371 | static inline struct Qdisc_class_common * | |
05bdd2f1 | 372 | qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
6fe1c7a5 PM |
373 | { |
374 | struct Qdisc_class_common *cl; | |
6fe1c7a5 PM |
375 | unsigned int h; |
376 | ||
377 | h = qdisc_class_hash(id, hash->hashmask); | |
b67bfe0d | 378 | hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
6fe1c7a5 PM |
379 | if (cl->classid == id) |
380 | return cl; | |
381 | } | |
382 | return NULL; | |
383 | } | |
384 | ||
5c15257f JP |
385 | int qdisc_class_hash_init(struct Qdisc_class_hash *); |
386 | void qdisc_class_hash_insert(struct Qdisc_class_hash *, | |
387 | struct Qdisc_class_common *); | |
388 | void qdisc_class_hash_remove(struct Qdisc_class_hash *, | |
389 | struct Qdisc_class_common *); | |
390 | void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
391 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
392 | ||
393 | void dev_init_scheduler(struct net_device *dev); | |
394 | void dev_shutdown(struct net_device *dev); | |
395 | void dev_activate(struct net_device *dev); | |
396 | void dev_deactivate(struct net_device *dev); | |
397 | void dev_deactivate_many(struct list_head *head); | |
398 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
399 | struct Qdisc *qdisc); | |
400 | void qdisc_reset(struct Qdisc *qdisc); | |
401 | void qdisc_destroy(struct Qdisc *qdisc); | |
2ccccf5f WC |
402 | void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n, |
403 | unsigned int len); | |
5c15257f | 404 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d2a7f269 | 405 | const struct Qdisc_ops *ops); |
5c15257f | 406 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 407 | const struct Qdisc_ops *ops, u32 parentid); |
5c15257f JP |
408 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
409 | const struct qdisc_size_table *stab); | |
1e052be6 | 410 | bool tcf_destroy(struct tcf_proto *tp, bool force); |
25d8c0d5 | 411 | void tcf_destroy_chain(struct tcf_proto __rcu **fl); |
27b29f63 | 412 | int skb_do_redirect(struct sk_buff *); |
1da177e4 | 413 | |
fdc5432a DB |
414 | static inline bool skb_at_tc_ingress(const struct sk_buff *skb) |
415 | { | |
416 | #ifdef CONFIG_NET_CLS_ACT | |
417 | return G_TC_AT(skb->tc_verd) & AT_INGRESS; | |
418 | #else | |
419 | return false; | |
420 | #endif | |
421 | } | |
422 | ||
f0796d5c JF |
423 | /* Reset all TX qdiscs greater then index of a device. */ |
424 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) | |
5aa70995 | 425 | { |
4ef6acff JF |
426 | struct Qdisc *qdisc; |
427 | ||
f0796d5c | 428 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 429 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
430 | if (qdisc) { |
431 | spin_lock_bh(qdisc_lock(qdisc)); | |
432 | qdisc_reset(qdisc); | |
433 | spin_unlock_bh(qdisc_lock(qdisc)); | |
434 | } | |
435 | } | |
5aa70995 DM |
436 | } |
437 | ||
5aa70995 DM |
438 | static inline void qdisc_reset_all_tx(struct net_device *dev) |
439 | { | |
f0796d5c | 440 | qdisc_reset_all_tx_gt(dev, 0); |
5aa70995 DM |
441 | } |
442 | ||
3e745dd6 DM |
443 | /* Are all TX queues of the device empty? */ |
444 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
445 | { | |
e8a0464c | 446 | unsigned int i; |
46e5da40 JF |
447 | |
448 | rcu_read_lock(); | |
e8a0464c DM |
449 | for (i = 0; i < dev->num_tx_queues; i++) { |
450 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 451 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 452 | |
46e5da40 JF |
453 | if (q->q.qlen) { |
454 | rcu_read_unlock(); | |
e8a0464c | 455 | return false; |
46e5da40 | 456 | } |
e8a0464c | 457 | } |
46e5da40 | 458 | rcu_read_unlock(); |
e8a0464c | 459 | return true; |
3e745dd6 DM |
460 | } |
461 | ||
6fa9864b | 462 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 463 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 464 | { |
e8a0464c | 465 | unsigned int i; |
46e5da40 | 466 | |
e8a0464c DM |
467 | for (i = 0; i < dev->num_tx_queues; i++) { |
468 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 469 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
470 | return true; |
471 | } | |
472 | return false; | |
6fa9864b DM |
473 | } |
474 | ||
e8a0464c | 475 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
476 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
477 | { | |
e8a0464c | 478 | unsigned int i; |
46e5da40 | 479 | |
e8a0464c DM |
480 | for (i = 0; i < dev->num_tx_queues; i++) { |
481 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 482 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
e8a0464c DM |
483 | return false; |
484 | } | |
485 | return true; | |
05297949 DM |
486 | } |
487 | ||
bfe0d029 | 488 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 489 | { |
175f9c1b | 490 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
491 | } |
492 | ||
c27f339a | 493 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
494 | enum net_xmit_qdisc_t { |
495 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 496 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
497 | }; |
498 | ||
c27f339a | 499 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 500 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
501 | #else |
502 | #define net_xmit_drop_count(e) (1) | |
503 | #endif | |
504 | ||
a2da570d ED |
505 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
506 | const struct Qdisc *sch) | |
5f86173b | 507 | { |
3a682fbd | 508 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
509 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
510 | ||
511 | if (stab) | |
512 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 513 | #endif |
a2da570d ED |
514 | } |
515 | ||
516 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch) | |
517 | { | |
518 | qdisc_calculate_pkt_len(skb, sch); | |
5f86173b JK |
519 | return sch->enqueue(skb, sch); |
520 | } | |
521 | ||
22e0f8b9 JF |
522 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
523 | { | |
524 | return q->flags & TCQ_F_CPUSTATS; | |
525 | } | |
bfe0d029 | 526 | |
38040702 AV |
527 | static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, |
528 | __u64 bytes, __u32 packets) | |
529 | { | |
530 | bstats->bytes += bytes; | |
531 | bstats->packets += packets; | |
532 | } | |
533 | ||
bfe0d029 ED |
534 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, |
535 | const struct sk_buff *skb) | |
536 | { | |
38040702 AV |
537 | _bstats_update(bstats, |
538 | qdisc_pkt_len(skb), | |
539 | skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); | |
540 | } | |
541 | ||
542 | static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, | |
543 | __u64 bytes, __u32 packets) | |
544 | { | |
545 | u64_stats_update_begin(&bstats->syncp); | |
546 | _bstats_update(&bstats->bstats, bytes, packets); | |
547 | u64_stats_update_end(&bstats->syncp); | |
bfe0d029 ED |
548 | } |
549 | ||
24ea591d ED |
550 | static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, |
551 | const struct sk_buff *skb) | |
22e0f8b9 | 552 | { |
22e0f8b9 JF |
553 | u64_stats_update_begin(&bstats->syncp); |
554 | bstats_update(&bstats->bstats, skb); | |
555 | u64_stats_update_end(&bstats->syncp); | |
556 | } | |
557 | ||
24ea591d ED |
558 | static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
559 | const struct sk_buff *skb) | |
560 | { | |
561 | bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); | |
562 | } | |
563 | ||
bfe0d029 ED |
564 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
565 | const struct sk_buff *skb) | |
bbd8a0d3 | 566 | { |
bfe0d029 | 567 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
568 | } |
569 | ||
25331d6c JF |
570 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
571 | const struct sk_buff *skb) | |
572 | { | |
573 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
574 | } | |
575 | ||
576 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, | |
577 | const struct sk_buff *skb) | |
578 | { | |
579 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
580 | } | |
581 | ||
582 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) | |
583 | { | |
584 | sch->qstats.drops += count; | |
585 | } | |
586 | ||
24ea591d | 587 | static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
25331d6c | 588 | { |
24ea591d | 589 | qstats->drops++; |
25331d6c JF |
590 | } |
591 | ||
24ea591d | 592 | static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
b0ab6f92 | 593 | { |
24ea591d ED |
594 | qstats->overlimits++; |
595 | } | |
b0ab6f92 | 596 | |
24ea591d ED |
597 | static inline void qdisc_qstats_drop(struct Qdisc *sch) |
598 | { | |
599 | qstats_drop_inc(&sch->qstats); | |
600 | } | |
601 | ||
602 | static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) | |
603 | { | |
604 | qstats_drop_inc(this_cpu_ptr(sch->cpu_qstats)); | |
b0ab6f92 JF |
605 | } |
606 | ||
25331d6c JF |
607 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
608 | { | |
609 | sch->qstats.overlimits++; | |
610 | } | |
611 | ||
9972b25d TG |
612 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
613 | struct sk_buff_head *list) | |
614 | { | |
615 | __skb_queue_tail(list, skb); | |
25331d6c | 616 | qdisc_qstats_backlog_inc(sch, skb); |
9972b25d TG |
617 | |
618 | return NET_XMIT_SUCCESS; | |
619 | } | |
620 | ||
621 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
622 | { | |
623 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
624 | } | |
625 | ||
626 | static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch, | |
627 | struct sk_buff_head *list) | |
628 | { | |
629 | struct sk_buff *skb = __skb_dequeue(list); | |
630 | ||
9190b3b3 | 631 | if (likely(skb != NULL)) { |
25331d6c | 632 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
633 | qdisc_bstats_update(sch, skb); |
634 | } | |
9972b25d TG |
635 | |
636 | return skb; | |
637 | } | |
638 | ||
639 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
640 | { | |
641 | return __qdisc_dequeue_head(sch, &sch->q); | |
57dbb2d8 HPP |
642 | } |
643 | ||
644 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, | |
645 | struct sk_buff_head *list) | |
646 | { | |
9190b3b3 | 647 | struct sk_buff *skb = __skb_dequeue(list); |
57dbb2d8 HPP |
648 | |
649 | if (likely(skb != NULL)) { | |
650 | unsigned int len = qdisc_pkt_len(skb); | |
25331d6c | 651 | qdisc_qstats_backlog_dec(sch, skb); |
57dbb2d8 HPP |
652 | kfree_skb(skb); |
653 | return len; | |
654 | } | |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
659 | static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch) | |
660 | { | |
661 | return __qdisc_queue_drop_head(sch, &sch->q); | |
9972b25d TG |
662 | } |
663 | ||
48a8f519 PM |
664 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
665 | { | |
666 | return skb_peek(&sch->q); | |
667 | } | |
668 | ||
77be155c JP |
669 | /* generic pseudo peek method for non-work-conserving qdisc */ |
670 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
671 | { | |
672 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ | |
61c9eaf9 | 673 | if (!sch->gso_skb) { |
77be155c | 674 | sch->gso_skb = sch->dequeue(sch); |
61c9eaf9 JP |
675 | if (sch->gso_skb) |
676 | /* it's still part of the queue */ | |
677 | sch->q.qlen++; | |
678 | } | |
77be155c JP |
679 | |
680 | return sch->gso_skb; | |
681 | } | |
682 | ||
683 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
684 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
685 | { | |
686 | struct sk_buff *skb = sch->gso_skb; | |
687 | ||
61c9eaf9 | 688 | if (skb) { |
77be155c | 689 | sch->gso_skb = NULL; |
61c9eaf9 JP |
690 | sch->q.qlen--; |
691 | } else { | |
77be155c | 692 | skb = sch->dequeue(sch); |
61c9eaf9 | 693 | } |
77be155c JP |
694 | |
695 | return skb; | |
696 | } | |
697 | ||
9972b25d TG |
698 | static inline void __qdisc_reset_queue(struct Qdisc *sch, |
699 | struct sk_buff_head *list) | |
700 | { | |
701 | /* | |
702 | * We do not know the backlog in bytes of this list, it | |
703 | * is up to the caller to correct it | |
704 | */ | |
93245dd6 | 705 | __skb_queue_purge(list); |
9972b25d TG |
706 | } |
707 | ||
708 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
709 | { | |
710 | __qdisc_reset_queue(sch, &sch->q); | |
711 | sch->qstats.backlog = 0; | |
712 | } | |
713 | ||
86a7996c WC |
714 | static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, |
715 | struct Qdisc **pold) | |
716 | { | |
717 | struct Qdisc *old; | |
718 | ||
719 | sch_tree_lock(sch); | |
720 | old = *pold; | |
721 | *pold = new; | |
722 | if (old != NULL) { | |
2ccccf5f | 723 | qdisc_tree_reduce_backlog(old, old->q.qlen, old->qstats.backlog); |
86a7996c WC |
724 | qdisc_reset(old); |
725 | } | |
726 | sch_tree_unlock(sch); | |
727 | ||
728 | return old; | |
729 | } | |
730 | ||
9972b25d TG |
731 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) |
732 | { | |
733 | kfree_skb(skb); | |
25331d6c | 734 | qdisc_qstats_drop(sch); |
9972b25d TG |
735 | |
736 | return NET_XMIT_DROP; | |
737 | } | |
738 | ||
e9bef55d JDB |
739 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
740 | long it will take to send a packet given its size. | |
741 | */ | |
742 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
743 | { | |
e08b0998 JDB |
744 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
745 | if (slot < 0) | |
746 | slot = 0; | |
e9bef55d JDB |
747 | slot >>= rtab->rate.cell_log; |
748 | if (slot > 255) | |
a02cec21 | 749 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
750 | return rtab->data[slot]; |
751 | } | |
752 | ||
292f1c7f | 753 | struct psched_ratecfg { |
130d3d68 | 754 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
755 | u32 mult; |
756 | u16 overhead; | |
8a8e3d84 | 757 | u8 linklayer; |
01cb71d2 | 758 | u8 shift; |
292f1c7f JP |
759 | }; |
760 | ||
761 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
762 | unsigned int len) | |
763 | { | |
8a8e3d84 JDB |
764 | len += r->overhead; |
765 | ||
766 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
767 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
768 | ||
769 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
770 | } |
771 | ||
5c15257f | 772 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
773 | const struct tc_ratespec *conf, |
774 | u64 rate64); | |
292f1c7f | 775 | |
01cb71d2 ED |
776 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
777 | const struct psched_ratecfg *r) | |
292f1c7f | 778 | { |
01cb71d2 | 779 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
780 | |
781 | /* legacy struct tc_ratespec has a 32bit @rate field | |
782 | * Qdisc using 64bit rate should add new attributes | |
783 | * in order to maintain compatibility. | |
784 | */ | |
785 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
786 | ||
01cb71d2 | 787 | res->overhead = r->overhead; |
8a8e3d84 | 788 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
789 | } |
790 | ||
1da177e4 | 791 | #endif |