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 DM |
78 | void *u32_node; |
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 | ||
fd245a4a | 104 | static inline bool qdisc_is_running(const struct Qdisc *qdisc) |
bc135b23 | 105 | { |
f9eb8aea | 106 | return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; |
bc135b23 ED |
107 | } |
108 | ||
109 | static inline bool qdisc_run_begin(struct Qdisc *qdisc) | |
110 | { | |
fd245a4a ED |
111 | if (qdisc_is_running(qdisc)) |
112 | return false; | |
52fbb290 ED |
113 | /* Variant of write_seqcount_begin() telling lockdep a trylock |
114 | * was attempted. | |
115 | */ | |
116 | raw_write_seqcount_begin(&qdisc->running); | |
117 | seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_); | |
fd245a4a | 118 | return true; |
bc135b23 ED |
119 | } |
120 | ||
121 | static inline void qdisc_run_end(struct Qdisc *qdisc) | |
122 | { | |
f9eb8aea | 123 | write_seqcount_end(&qdisc->running); |
fd245a4a ED |
124 | } |
125 | ||
5772e9a3 JDB |
126 | static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) |
127 | { | |
128 | return qdisc->flags & TCQ_F_ONETXQUEUE; | |
129 | } | |
130 | ||
131 | static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) | |
132 | { | |
133 | #ifdef CONFIG_BQL | |
134 | /* Non-BQL migrated drivers will return 0, too. */ | |
135 | return dql_avail(&txq->dql); | |
136 | #else | |
137 | return 0; | |
138 | #endif | |
139 | } | |
140 | ||
fd2c3ef7 | 141 | struct Qdisc_class_ops { |
1da177e4 | 142 | /* Child qdisc manipulation */ |
926e61b7 | 143 | struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); |
1da177e4 LT |
144 | int (*graft)(struct Qdisc *, unsigned long cl, |
145 | struct Qdisc *, struct Qdisc **); | |
146 | struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); | |
43effa1e | 147 | void (*qlen_notify)(struct Qdisc *, unsigned long); |
1da177e4 LT |
148 | |
149 | /* Class manipulation routines */ | |
150 | unsigned long (*get)(struct Qdisc *, u32 classid); | |
151 | void (*put)(struct Qdisc *, unsigned long); | |
152 | int (*change)(struct Qdisc *, u32, u32, | |
1e90474c | 153 | struct nlattr **, unsigned long *); |
1da177e4 LT |
154 | int (*delete)(struct Qdisc *, unsigned long); |
155 | void (*walk)(struct Qdisc *, struct qdisc_walker * arg); | |
156 | ||
157 | /* Filter manipulation */ | |
6529eaba | 158 | struct tcf_block * (*tcf_block)(struct Qdisc *, unsigned long); |
92c075db | 159 | bool (*tcf_cl_offload)(u32 classid); |
1da177e4 LT |
160 | unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, |
161 | u32 classid); | |
162 | void (*unbind_tcf)(struct Qdisc *, unsigned long); | |
163 | ||
164 | /* rtnetlink specific */ | |
165 | int (*dump)(struct Qdisc *, unsigned long, | |
166 | struct sk_buff *skb, struct tcmsg*); | |
167 | int (*dump_stats)(struct Qdisc *, unsigned long, | |
168 | struct gnet_dump *); | |
169 | }; | |
170 | ||
fd2c3ef7 | 171 | struct Qdisc_ops { |
1da177e4 | 172 | struct Qdisc_ops *next; |
20fea08b | 173 | const struct Qdisc_class_ops *cl_ops; |
1da177e4 LT |
174 | char id[IFNAMSIZ]; |
175 | int priv_size; | |
176 | ||
520ac30f ED |
177 | int (*enqueue)(struct sk_buff *skb, |
178 | struct Qdisc *sch, | |
179 | struct sk_buff **to_free); | |
1da177e4 | 180 | struct sk_buff * (*dequeue)(struct Qdisc *); |
90d841fd | 181 | struct sk_buff * (*peek)(struct Qdisc *); |
1da177e4 | 182 | |
1e90474c | 183 | int (*init)(struct Qdisc *, struct nlattr *arg); |
1da177e4 LT |
184 | void (*reset)(struct Qdisc *); |
185 | void (*destroy)(struct Qdisc *); | |
1e90474c | 186 | int (*change)(struct Qdisc *, struct nlattr *arg); |
6ec1c69a | 187 | void (*attach)(struct Qdisc *); |
1da177e4 LT |
188 | |
189 | int (*dump)(struct Qdisc *, struct sk_buff *); | |
190 | int (*dump_stats)(struct Qdisc *, struct gnet_dump *); | |
191 | ||
192 | struct module *owner; | |
193 | }; | |
194 | ||
195 | ||
fd2c3ef7 | 196 | struct tcf_result { |
db50514f JP |
197 | union { |
198 | struct { | |
199 | unsigned long class; | |
200 | u32 classid; | |
201 | }; | |
202 | const struct tcf_proto *goto_tp; | |
203 | }; | |
1da177e4 LT |
204 | }; |
205 | ||
fd2c3ef7 | 206 | struct tcf_proto_ops { |
36272874 | 207 | struct list_head head; |
1da177e4 LT |
208 | char kind[IFNAMSIZ]; |
209 | ||
dc7f9f6e ED |
210 | int (*classify)(struct sk_buff *, |
211 | const struct tcf_proto *, | |
212 | struct tcf_result *); | |
1da177e4 | 213 | int (*init)(struct tcf_proto*); |
763dbf63 | 214 | void (*destroy)(struct tcf_proto*); |
1da177e4 LT |
215 | |
216 | unsigned long (*get)(struct tcf_proto*, u32 handle); | |
c1b52739 | 217 | int (*change)(struct net *net, struct sk_buff *, |
af4c6641 | 218 | struct tcf_proto*, unsigned long, |
add93b61 | 219 | u32 handle, struct nlattr **, |
2f7ef2f8 | 220 | unsigned long *, bool); |
763dbf63 | 221 | int (*delete)(struct tcf_proto*, unsigned long, bool*); |
1da177e4 LT |
222 | void (*walk)(struct tcf_proto*, struct tcf_walker *arg); |
223 | ||
224 | /* rtnetlink specific */ | |
832d1d5b | 225 | int (*dump)(struct net*, struct tcf_proto*, unsigned long, |
1da177e4 LT |
226 | struct sk_buff *skb, struct tcmsg*); |
227 | ||
228 | struct module *owner; | |
229 | }; | |
230 | ||
fd2c3ef7 | 231 | struct tcf_proto { |
1da177e4 | 232 | /* Fast access part */ |
25d8c0d5 JF |
233 | struct tcf_proto __rcu *next; |
234 | void __rcu *root; | |
dc7f9f6e ED |
235 | int (*classify)(struct sk_buff *, |
236 | const struct tcf_proto *, | |
237 | struct tcf_result *); | |
66c6f529 | 238 | __be16 protocol; |
1da177e4 LT |
239 | |
240 | /* All the rest */ | |
241 | u32 prio; | |
242 | u32 classid; | |
243 | struct Qdisc *q; | |
244 | void *data; | |
dc7f9f6e | 245 | const struct tcf_proto_ops *ops; |
5bc17018 | 246 | struct tcf_chain *chain; |
25d8c0d5 | 247 | struct rcu_head rcu; |
1da177e4 LT |
248 | }; |
249 | ||
175f9c1b JK |
250 | struct qdisc_skb_cb { |
251 | unsigned int pkt_len; | |
df4ab5b3 | 252 | u16 slave_dev_queue_mapping; |
045efa82 | 253 | u16 tc_classid; |
25711786 ED |
254 | #define QDISC_CB_PRIV_LEN 20 |
255 | unsigned char data[QDISC_CB_PRIV_LEN]; | |
175f9c1b JK |
256 | }; |
257 | ||
2190d1d0 JP |
258 | struct tcf_chain { |
259 | struct tcf_proto __rcu *filter_chain; | |
6529eaba | 260 | struct tcf_proto __rcu **p_filter_chain; |
5bc17018 JP |
261 | struct list_head list; |
262 | struct tcf_block *block; | |
263 | u32 index; /* chain index */ | |
264 | unsigned int refcnt; | |
6529eaba JP |
265 | }; |
266 | ||
2190d1d0 | 267 | struct tcf_block { |
5bc17018 | 268 | struct list_head chain_list; |
2190d1d0 JP |
269 | }; |
270 | ||
16bda13d DM |
271 | static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
272 | { | |
273 | struct qdisc_skb_cb *qcb; | |
5ee31c68 ED |
274 | |
275 | BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); | |
16bda13d DM |
276 | BUILD_BUG_ON(sizeof(qcb->data) < sz); |
277 | } | |
278 | ||
05bdd2f1 | 279 | static inline int qdisc_qlen(const struct Qdisc *q) |
bbd8a0d3 KK |
280 | { |
281 | return q->q.qlen; | |
282 | } | |
283 | ||
bfe0d029 | 284 | static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
175f9c1b JK |
285 | { |
286 | return (struct qdisc_skb_cb *)skb->cb; | |
287 | } | |
288 | ||
83874000 DM |
289 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
290 | { | |
291 | return &qdisc->q.lock; | |
292 | } | |
293 | ||
05bdd2f1 | 294 | static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
7698b4fc | 295 | { |
46e5da40 JF |
296 | struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
297 | ||
298 | return q; | |
7698b4fc DM |
299 | } |
300 | ||
05bdd2f1 | 301 | static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
2540e051 JP |
302 | { |
303 | return qdisc->dev_queue->qdisc_sleeping; | |
304 | } | |
305 | ||
7e43f112 DM |
306 | /* The qdisc root lock is a mechanism by which to top level |
307 | * of a qdisc tree can be locked from any qdisc node in the | |
308 | * forest. This allows changing the configuration of some | |
309 | * aspect of the qdisc tree while blocking out asynchronous | |
310 | * qdisc access in the packet processing paths. | |
311 | * | |
312 | * It is only legal to do this when the root will not change | |
313 | * on us. Otherwise we'll potentially lock the wrong qdisc | |
314 | * root. This is enforced by holding the RTNL semaphore, which | |
315 | * all users of this lock accessor must do. | |
316 | */ | |
05bdd2f1 | 317 | static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) |
7698b4fc DM |
318 | { |
319 | struct Qdisc *root = qdisc_root(qdisc); | |
320 | ||
7e43f112 | 321 | ASSERT_RTNL(); |
83874000 | 322 | return qdisc_lock(root); |
7698b4fc DM |
323 | } |
324 | ||
05bdd2f1 | 325 | static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
f6f9b93f JP |
326 | { |
327 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
328 | ||
329 | ASSERT_RTNL(); | |
330 | return qdisc_lock(root); | |
331 | } | |
332 | ||
edb09eb1 ED |
333 | static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) |
334 | { | |
335 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
336 | ||
337 | ASSERT_RTNL(); | |
338 | return &root->running; | |
339 | } | |
340 | ||
05bdd2f1 | 341 | static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) |
5ce2d488 DM |
342 | { |
343 | return qdisc->dev_queue->dev; | |
344 | } | |
1da177e4 | 345 | |
05bdd2f1 | 346 | static inline void sch_tree_lock(const struct Qdisc *q) |
78a5b30b | 347 | { |
fe439dd0 | 348 | spin_lock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
349 | } |
350 | ||
05bdd2f1 | 351 | static inline void sch_tree_unlock(const struct Qdisc *q) |
78a5b30b | 352 | { |
fe439dd0 | 353 | spin_unlock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
354 | } |
355 | ||
356 | #define tcf_tree_lock(tp) sch_tree_lock((tp)->q) | |
357 | #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q) | |
1da177e4 | 358 | |
e41a33e6 TG |
359 | extern struct Qdisc noop_qdisc; |
360 | extern struct Qdisc_ops noop_qdisc_ops; | |
6ec1c69a DM |
361 | extern struct Qdisc_ops pfifo_fast_ops; |
362 | extern struct Qdisc_ops mq_qdisc_ops; | |
d66d6c31 | 363 | extern struct Qdisc_ops noqueue_qdisc_ops; |
6da7c8fc | 364 | extern const struct Qdisc_ops *default_qdisc_ops; |
1f27cde3 ED |
365 | static inline const struct Qdisc_ops * |
366 | get_default_qdisc_ops(const struct net_device *dev, int ntx) | |
367 | { | |
368 | return ntx < dev->real_num_tx_queues ? | |
369 | default_qdisc_ops : &pfifo_fast_ops; | |
370 | } | |
e41a33e6 | 371 | |
fd2c3ef7 | 372 | struct Qdisc_class_common { |
6fe1c7a5 PM |
373 | u32 classid; |
374 | struct hlist_node hnode; | |
375 | }; | |
376 | ||
fd2c3ef7 | 377 | struct Qdisc_class_hash { |
6fe1c7a5 PM |
378 | struct hlist_head *hash; |
379 | unsigned int hashsize; | |
380 | unsigned int hashmask; | |
381 | unsigned int hashelems; | |
382 | }; | |
383 | ||
384 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
385 | { | |
386 | id ^= id >> 8; | |
387 | id ^= id >> 4; | |
388 | return id & mask; | |
389 | } | |
390 | ||
391 | static inline struct Qdisc_class_common * | |
05bdd2f1 | 392 | qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
6fe1c7a5 PM |
393 | { |
394 | struct Qdisc_class_common *cl; | |
6fe1c7a5 PM |
395 | unsigned int h; |
396 | ||
397 | h = qdisc_class_hash(id, hash->hashmask); | |
b67bfe0d | 398 | hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
6fe1c7a5 PM |
399 | if (cl->classid == id) |
400 | return cl; | |
401 | } | |
402 | return NULL; | |
403 | } | |
404 | ||
5c15257f JP |
405 | int qdisc_class_hash_init(struct Qdisc_class_hash *); |
406 | void qdisc_class_hash_insert(struct Qdisc_class_hash *, | |
407 | struct Qdisc_class_common *); | |
408 | void qdisc_class_hash_remove(struct Qdisc_class_hash *, | |
409 | struct Qdisc_class_common *); | |
410 | void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
411 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
412 | ||
413 | void dev_init_scheduler(struct net_device *dev); | |
414 | void dev_shutdown(struct net_device *dev); | |
415 | void dev_activate(struct net_device *dev); | |
416 | void dev_deactivate(struct net_device *dev); | |
417 | void dev_deactivate_many(struct list_head *head); | |
418 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
419 | struct Qdisc *qdisc); | |
420 | void qdisc_reset(struct Qdisc *qdisc); | |
421 | void qdisc_destroy(struct Qdisc *qdisc); | |
2ccccf5f WC |
422 | void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n, |
423 | unsigned int len); | |
5c15257f | 424 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d2a7f269 | 425 | const struct Qdisc_ops *ops); |
5c15257f | 426 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 427 | const struct Qdisc_ops *ops, u32 parentid); |
5c15257f JP |
428 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
429 | const struct qdisc_size_table *stab); | |
27b29f63 | 430 | int skb_do_redirect(struct sk_buff *); |
1da177e4 | 431 | |
a5135bcf WB |
432 | static inline void skb_reset_tc(struct sk_buff *skb) |
433 | { | |
434 | #ifdef CONFIG_NET_CLS_ACT | |
bc31c905 | 435 | skb->tc_redirected = 0; |
a5135bcf WB |
436 | #endif |
437 | } | |
438 | ||
fdc5432a DB |
439 | static inline bool skb_at_tc_ingress(const struct sk_buff *skb) |
440 | { | |
441 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 442 | return skb->tc_at_ingress; |
fdc5432a DB |
443 | #else |
444 | return false; | |
445 | #endif | |
446 | } | |
447 | ||
e7246e12 WB |
448 | static inline bool skb_skip_tc_classify(struct sk_buff *skb) |
449 | { | |
450 | #ifdef CONFIG_NET_CLS_ACT | |
451 | if (skb->tc_skip_classify) { | |
452 | skb->tc_skip_classify = 0; | |
453 | return true; | |
454 | } | |
455 | #endif | |
456 | return false; | |
457 | } | |
458 | ||
f0796d5c JF |
459 | /* Reset all TX qdiscs greater then index of a device. */ |
460 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) | |
5aa70995 | 461 | { |
4ef6acff JF |
462 | struct Qdisc *qdisc; |
463 | ||
f0796d5c | 464 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 465 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
466 | if (qdisc) { |
467 | spin_lock_bh(qdisc_lock(qdisc)); | |
468 | qdisc_reset(qdisc); | |
469 | spin_unlock_bh(qdisc_lock(qdisc)); | |
470 | } | |
471 | } | |
5aa70995 DM |
472 | } |
473 | ||
5aa70995 DM |
474 | static inline void qdisc_reset_all_tx(struct net_device *dev) |
475 | { | |
f0796d5c | 476 | qdisc_reset_all_tx_gt(dev, 0); |
5aa70995 DM |
477 | } |
478 | ||
3e745dd6 DM |
479 | /* Are all TX queues of the device empty? */ |
480 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
481 | { | |
e8a0464c | 482 | unsigned int i; |
46e5da40 JF |
483 | |
484 | rcu_read_lock(); | |
e8a0464c DM |
485 | for (i = 0; i < dev->num_tx_queues; i++) { |
486 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 487 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 488 | |
46e5da40 JF |
489 | if (q->q.qlen) { |
490 | rcu_read_unlock(); | |
e8a0464c | 491 | return false; |
46e5da40 | 492 | } |
e8a0464c | 493 | } |
46e5da40 | 494 | rcu_read_unlock(); |
e8a0464c | 495 | return true; |
3e745dd6 DM |
496 | } |
497 | ||
6fa9864b | 498 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 499 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 500 | { |
e8a0464c | 501 | unsigned int i; |
46e5da40 | 502 | |
e8a0464c DM |
503 | for (i = 0; i < dev->num_tx_queues; i++) { |
504 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 505 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
506 | return true; |
507 | } | |
508 | return false; | |
6fa9864b DM |
509 | } |
510 | ||
e8a0464c | 511 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
512 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
513 | { | |
e8a0464c | 514 | unsigned int i; |
46e5da40 | 515 | |
e8a0464c DM |
516 | for (i = 0; i < dev->num_tx_queues; i++) { |
517 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 518 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
e8a0464c DM |
519 | return false; |
520 | } | |
521 | return true; | |
05297949 DM |
522 | } |
523 | ||
bfe0d029 | 524 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 525 | { |
175f9c1b | 526 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
527 | } |
528 | ||
c27f339a | 529 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
530 | enum net_xmit_qdisc_t { |
531 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 532 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
533 | }; |
534 | ||
c27f339a | 535 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 536 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
537 | #else |
538 | #define net_xmit_drop_count(e) (1) | |
539 | #endif | |
540 | ||
a2da570d ED |
541 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
542 | const struct Qdisc *sch) | |
5f86173b | 543 | { |
3a682fbd | 544 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
545 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
546 | ||
547 | if (stab) | |
548 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 549 | #endif |
a2da570d ED |
550 | } |
551 | ||
520ac30f ED |
552 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
553 | struct sk_buff **to_free) | |
a2da570d ED |
554 | { |
555 | qdisc_calculate_pkt_len(skb, sch); | |
520ac30f | 556 | return sch->enqueue(skb, sch, to_free); |
5f86173b JK |
557 | } |
558 | ||
22e0f8b9 JF |
559 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
560 | { | |
561 | return q->flags & TCQ_F_CPUSTATS; | |
562 | } | |
bfe0d029 | 563 | |
38040702 AV |
564 | static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, |
565 | __u64 bytes, __u32 packets) | |
566 | { | |
567 | bstats->bytes += bytes; | |
568 | bstats->packets += packets; | |
569 | } | |
570 | ||
bfe0d029 ED |
571 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, |
572 | const struct sk_buff *skb) | |
573 | { | |
38040702 AV |
574 | _bstats_update(bstats, |
575 | qdisc_pkt_len(skb), | |
576 | skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); | |
577 | } | |
578 | ||
579 | static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, | |
580 | __u64 bytes, __u32 packets) | |
581 | { | |
582 | u64_stats_update_begin(&bstats->syncp); | |
583 | _bstats_update(&bstats->bstats, bytes, packets); | |
584 | u64_stats_update_end(&bstats->syncp); | |
bfe0d029 ED |
585 | } |
586 | ||
24ea591d ED |
587 | static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, |
588 | const struct sk_buff *skb) | |
22e0f8b9 | 589 | { |
22e0f8b9 JF |
590 | u64_stats_update_begin(&bstats->syncp); |
591 | bstats_update(&bstats->bstats, skb); | |
592 | u64_stats_update_end(&bstats->syncp); | |
593 | } | |
594 | ||
24ea591d ED |
595 | static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
596 | const struct sk_buff *skb) | |
597 | { | |
598 | bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); | |
599 | } | |
600 | ||
bfe0d029 ED |
601 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
602 | const struct sk_buff *skb) | |
bbd8a0d3 | 603 | { |
bfe0d029 | 604 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
605 | } |
606 | ||
25331d6c JF |
607 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
608 | const struct sk_buff *skb) | |
609 | { | |
610 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
611 | } | |
612 | ||
613 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, | |
614 | const struct sk_buff *skb) | |
615 | { | |
616 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
617 | } | |
618 | ||
619 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) | |
620 | { | |
621 | sch->qstats.drops += count; | |
622 | } | |
623 | ||
24ea591d | 624 | static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
25331d6c | 625 | { |
24ea591d | 626 | qstats->drops++; |
25331d6c JF |
627 | } |
628 | ||
24ea591d | 629 | static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
b0ab6f92 | 630 | { |
24ea591d ED |
631 | qstats->overlimits++; |
632 | } | |
b0ab6f92 | 633 | |
24ea591d ED |
634 | static inline void qdisc_qstats_drop(struct Qdisc *sch) |
635 | { | |
636 | qstats_drop_inc(&sch->qstats); | |
637 | } | |
638 | ||
639 | static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) | |
640 | { | |
eb60a8dd | 641 | this_cpu_inc(sch->cpu_qstats->drops); |
b0ab6f92 JF |
642 | } |
643 | ||
25331d6c JF |
644 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
645 | { | |
646 | sch->qstats.overlimits++; | |
647 | } | |
648 | ||
48da34b7 FW |
649 | static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh) |
650 | { | |
651 | qh->head = NULL; | |
652 | qh->tail = NULL; | |
653 | qh->qlen = 0; | |
654 | } | |
655 | ||
9972b25d | 656 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
48da34b7 | 657 | struct qdisc_skb_head *qh) |
9972b25d | 658 | { |
48da34b7 FW |
659 | struct sk_buff *last = qh->tail; |
660 | ||
661 | if (last) { | |
662 | skb->next = NULL; | |
663 | last->next = skb; | |
664 | qh->tail = skb; | |
665 | } else { | |
666 | qh->tail = skb; | |
667 | qh->head = skb; | |
668 | } | |
669 | qh->qlen++; | |
25331d6c | 670 | qdisc_qstats_backlog_inc(sch, skb); |
9972b25d TG |
671 | |
672 | return NET_XMIT_SUCCESS; | |
673 | } | |
674 | ||
675 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
676 | { | |
677 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
678 | } | |
679 | ||
48da34b7 | 680 | static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) |
9972b25d | 681 | { |
48da34b7 FW |
682 | struct sk_buff *skb = qh->head; |
683 | ||
684 | if (likely(skb != NULL)) { | |
685 | qh->head = skb->next; | |
686 | qh->qlen--; | |
687 | if (qh->head == NULL) | |
688 | qh->tail = NULL; | |
689 | skb->next = NULL; | |
690 | } | |
9972b25d | 691 | |
ec323368 FW |
692 | return skb; |
693 | } | |
694 | ||
695 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
696 | { | |
697 | struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); | |
698 | ||
9190b3b3 | 699 | if (likely(skb != NULL)) { |
25331d6c | 700 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
701 | qdisc_bstats_update(sch, skb); |
702 | } | |
9972b25d TG |
703 | |
704 | return skb; | |
705 | } | |
706 | ||
520ac30f ED |
707 | /* Instead of calling kfree_skb() while root qdisc lock is held, |
708 | * queue the skb for future freeing at end of __dev_xmit_skb() | |
709 | */ | |
710 | static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) | |
711 | { | |
712 | skb->next = *to_free; | |
713 | *to_free = skb; | |
714 | } | |
715 | ||
57dbb2d8 | 716 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, |
48da34b7 | 717 | struct qdisc_skb_head *qh, |
520ac30f | 718 | struct sk_buff **to_free) |
57dbb2d8 | 719 | { |
48da34b7 | 720 | struct sk_buff *skb = __qdisc_dequeue_head(qh); |
57dbb2d8 HPP |
721 | |
722 | if (likely(skb != NULL)) { | |
723 | unsigned int len = qdisc_pkt_len(skb); | |
520ac30f | 724 | |
25331d6c | 725 | qdisc_qstats_backlog_dec(sch, skb); |
520ac30f | 726 | __qdisc_drop(skb, to_free); |
57dbb2d8 HPP |
727 | return len; |
728 | } | |
729 | ||
730 | return 0; | |
731 | } | |
732 | ||
520ac30f ED |
733 | static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch, |
734 | struct sk_buff **to_free) | |
57dbb2d8 | 735 | { |
520ac30f | 736 | return __qdisc_queue_drop_head(sch, &sch->q, to_free); |
9972b25d TG |
737 | } |
738 | ||
48a8f519 PM |
739 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
740 | { | |
48da34b7 FW |
741 | const struct qdisc_skb_head *qh = &sch->q; |
742 | ||
743 | return qh->head; | |
48a8f519 PM |
744 | } |
745 | ||
77be155c JP |
746 | /* generic pseudo peek method for non-work-conserving qdisc */ |
747 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
748 | { | |
749 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ | |
61c9eaf9 | 750 | if (!sch->gso_skb) { |
77be155c | 751 | sch->gso_skb = sch->dequeue(sch); |
a27758ff | 752 | if (sch->gso_skb) { |
61c9eaf9 | 753 | /* it's still part of the queue */ |
a27758ff | 754 | qdisc_qstats_backlog_inc(sch, sch->gso_skb); |
61c9eaf9 | 755 | sch->q.qlen++; |
a27758ff | 756 | } |
61c9eaf9 | 757 | } |
77be155c JP |
758 | |
759 | return sch->gso_skb; | |
760 | } | |
761 | ||
762 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
763 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
764 | { | |
765 | struct sk_buff *skb = sch->gso_skb; | |
766 | ||
61c9eaf9 | 767 | if (skb) { |
77be155c | 768 | sch->gso_skb = NULL; |
a27758ff | 769 | qdisc_qstats_backlog_dec(sch, skb); |
61c9eaf9 JP |
770 | sch->q.qlen--; |
771 | } else { | |
77be155c | 772 | skb = sch->dequeue(sch); |
61c9eaf9 | 773 | } |
77be155c JP |
774 | |
775 | return skb; | |
776 | } | |
777 | ||
48da34b7 | 778 | static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) |
9972b25d TG |
779 | { |
780 | /* | |
781 | * We do not know the backlog in bytes of this list, it | |
782 | * is up to the caller to correct it | |
783 | */ | |
48da34b7 FW |
784 | ASSERT_RTNL(); |
785 | if (qh->qlen) { | |
786 | rtnl_kfree_skbs(qh->head, qh->tail); | |
787 | ||
788 | qh->head = NULL; | |
789 | qh->tail = NULL; | |
790 | qh->qlen = 0; | |
1b5c5493 | 791 | } |
9972b25d TG |
792 | } |
793 | ||
794 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
795 | { | |
1b5c5493 | 796 | __qdisc_reset_queue(&sch->q); |
9972b25d TG |
797 | sch->qstats.backlog = 0; |
798 | } | |
799 | ||
86a7996c WC |
800 | static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, |
801 | struct Qdisc **pold) | |
802 | { | |
803 | struct Qdisc *old; | |
804 | ||
805 | sch_tree_lock(sch); | |
806 | old = *pold; | |
807 | *pold = new; | |
808 | if (old != NULL) { | |
2ccccf5f | 809 | qdisc_tree_reduce_backlog(old, old->q.qlen, old->qstats.backlog); |
86a7996c WC |
810 | qdisc_reset(old); |
811 | } | |
812 | sch_tree_unlock(sch); | |
813 | ||
814 | return old; | |
815 | } | |
816 | ||
1b5c5493 ED |
817 | static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) |
818 | { | |
819 | rtnl_kfree_skbs(skb, skb); | |
820 | qdisc_qstats_drop(sch); | |
821 | } | |
822 | ||
520ac30f ED |
823 | |
824 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, | |
825 | struct sk_buff **to_free) | |
9972b25d | 826 | { |
520ac30f | 827 | __qdisc_drop(skb, to_free); |
25331d6c | 828 | qdisc_qstats_drop(sch); |
9972b25d TG |
829 | |
830 | return NET_XMIT_DROP; | |
831 | } | |
832 | ||
e9bef55d JDB |
833 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
834 | long it will take to send a packet given its size. | |
835 | */ | |
836 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
837 | { | |
e08b0998 JDB |
838 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
839 | if (slot < 0) | |
840 | slot = 0; | |
e9bef55d JDB |
841 | slot >>= rtab->rate.cell_log; |
842 | if (slot > 255) | |
a02cec21 | 843 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
844 | return rtab->data[slot]; |
845 | } | |
846 | ||
292f1c7f | 847 | struct psched_ratecfg { |
130d3d68 | 848 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
849 | u32 mult; |
850 | u16 overhead; | |
8a8e3d84 | 851 | u8 linklayer; |
01cb71d2 | 852 | u8 shift; |
292f1c7f JP |
853 | }; |
854 | ||
855 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
856 | unsigned int len) | |
857 | { | |
8a8e3d84 JDB |
858 | len += r->overhead; |
859 | ||
860 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
861 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
862 | ||
863 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
864 | } |
865 | ||
5c15257f | 866 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
867 | const struct tc_ratespec *conf, |
868 | u64 rate64); | |
292f1c7f | 869 | |
01cb71d2 ED |
870 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
871 | const struct psched_ratecfg *r) | |
292f1c7f | 872 | { |
01cb71d2 | 873 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
874 | |
875 | /* legacy struct tc_ratespec has a 32bit @rate field | |
876 | * Qdisc using 64bit rate should add new attributes | |
877 | * in order to maintain compatibility. | |
878 | */ | |
879 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
880 | ||
01cb71d2 | 881 | res->overhead = r->overhead; |
8a8e3d84 | 882 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
883 | } |
884 | ||
1da177e4 | 885 | #endif |