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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> |
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, |
e2627c8c DM |
29 | }; |
30 | ||
175f9c1b | 31 | struct qdisc_size_table { |
a2da570d | 32 | struct rcu_head rcu; |
175f9c1b JK |
33 | struct list_head list; |
34 | struct tc_sizespec szopts; | |
35 | int refcnt; | |
36 | u16 data[]; | |
37 | }; | |
38 | ||
48da34b7 FW |
39 | /* similar to sk_buff_head, but skb->prev pointer is undefined. */ |
40 | struct qdisc_skb_head { | |
41 | struct sk_buff *head; | |
42 | struct sk_buff *tail; | |
43 | __u32 qlen; | |
44 | spinlock_t lock; | |
45 | }; | |
46 | ||
fd2c3ef7 | 47 | struct Qdisc { |
520ac30f ED |
48 | int (*enqueue)(struct sk_buff *skb, |
49 | struct Qdisc *sch, | |
50 | struct sk_buff **to_free); | |
51 | struct sk_buff * (*dequeue)(struct Qdisc *sch); | |
05bdd2f1 | 52 | unsigned int flags; |
b00355db | 53 | #define TCQ_F_BUILTIN 1 |
fd245a4a ED |
54 | #define TCQ_F_INGRESS 2 |
55 | #define TCQ_F_CAN_BYPASS 4 | |
56 | #define TCQ_F_MQROOT 8 | |
1abbe139 ED |
57 | #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for |
58 | * q->dev_queue : It can test | |
59 | * netif_xmit_frozen_or_stopped() before | |
60 | * dequeueing next packet. | |
61 | * Its true for MQ/MQPRIO slaves, or non | |
62 | * multiqueue device. | |
63 | */ | |
b00355db | 64 | #define TCQ_F_WARN_NONWC (1 << 16) |
22e0f8b9 | 65 | #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ |
4eaf3b84 ED |
66 | #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : |
67 | * qdisc_tree_decrease_qlen() should stop. | |
68 | */ | |
45203a3b | 69 | u32 limit; |
05bdd2f1 | 70 | const struct Qdisc_ops *ops; |
a2da570d | 71 | struct qdisc_size_table __rcu *stab; |
59cc1f61 | 72 | struct hlist_node hash; |
1da177e4 LT |
73 | u32 handle; |
74 | u32 parent; | |
72b25a91 DM |
75 | void *u32_node; |
76 | ||
5e140dfc | 77 | struct netdev_queue *dev_queue; |
5e140dfc | 78 | |
1c0d32fd | 79 | struct net_rate_estimator __rcu *rate_est; |
0d32ef8c ED |
80 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; |
81 | struct gnet_stats_queue __percpu *cpu_qstats; | |
82 | ||
5e140dfc ED |
83 | /* |
84 | * For performance sake on SMP, we put highly modified fields at the end | |
85 | */ | |
4d202a0d | 86 | struct sk_buff *gso_skb ____cacheline_aligned_in_smp; |
48da34b7 | 87 | struct qdisc_skb_head q; |
0d32ef8c | 88 | struct gnet_stats_basic_packed bstats; |
f9eb8aea | 89 | seqcount_t running; |
0d32ef8c | 90 | struct gnet_stats_queue qstats; |
4d202a0d ED |
91 | unsigned long state; |
92 | struct Qdisc *next_sched; | |
93 | struct sk_buff *skb_bad_txq; | |
79640a4c | 94 | struct rcu_head rcu_head; |
45203a3b ED |
95 | int padded; |
96 | atomic_t refcnt; | |
97 | ||
98 | spinlock_t busylock ____cacheline_aligned_in_smp; | |
1da177e4 LT |
99 | }; |
100 | ||
fd245a4a | 101 | static inline bool qdisc_is_running(const struct Qdisc *qdisc) |
bc135b23 | 102 | { |
f9eb8aea | 103 | return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; |
bc135b23 ED |
104 | } |
105 | ||
106 | static inline bool qdisc_run_begin(struct Qdisc *qdisc) | |
107 | { | |
fd245a4a ED |
108 | if (qdisc_is_running(qdisc)) |
109 | return false; | |
52fbb290 ED |
110 | /* Variant of write_seqcount_begin() telling lockdep a trylock |
111 | * was attempted. | |
112 | */ | |
113 | raw_write_seqcount_begin(&qdisc->running); | |
114 | seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_); | |
fd245a4a | 115 | return true; |
bc135b23 ED |
116 | } |
117 | ||
118 | static inline void qdisc_run_end(struct Qdisc *qdisc) | |
119 | { | |
f9eb8aea | 120 | write_seqcount_end(&qdisc->running); |
fd245a4a ED |
121 | } |
122 | ||
5772e9a3 JDB |
123 | static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) |
124 | { | |
125 | return qdisc->flags & TCQ_F_ONETXQUEUE; | |
126 | } | |
127 | ||
128 | static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) | |
129 | { | |
130 | #ifdef CONFIG_BQL | |
131 | /* Non-BQL migrated drivers will return 0, too. */ | |
132 | return dql_avail(&txq->dql); | |
133 | #else | |
134 | return 0; | |
135 | #endif | |
136 | } | |
137 | ||
fd2c3ef7 | 138 | struct Qdisc_class_ops { |
1da177e4 | 139 | /* Child qdisc manipulation */ |
926e61b7 | 140 | struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); |
1da177e4 LT |
141 | int (*graft)(struct Qdisc *, unsigned long cl, |
142 | struct Qdisc *, struct Qdisc **); | |
143 | struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); | |
43effa1e | 144 | void (*qlen_notify)(struct Qdisc *, unsigned long); |
1da177e4 LT |
145 | |
146 | /* Class manipulation routines */ | |
147 | unsigned long (*get)(struct Qdisc *, u32 classid); | |
148 | void (*put)(struct Qdisc *, unsigned long); | |
149 | int (*change)(struct Qdisc *, u32, u32, | |
1e90474c | 150 | struct nlattr **, unsigned long *); |
1da177e4 LT |
151 | int (*delete)(struct Qdisc *, unsigned long); |
152 | void (*walk)(struct Qdisc *, struct qdisc_walker * arg); | |
153 | ||
154 | /* Filter manipulation */ | |
25d8c0d5 | 155 | struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long); |
92c075db | 156 | bool (*tcf_cl_offload)(u32 classid); |
1da177e4 LT |
157 | unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, |
158 | u32 classid); | |
159 | void (*unbind_tcf)(struct Qdisc *, unsigned long); | |
160 | ||
161 | /* rtnetlink specific */ | |
162 | int (*dump)(struct Qdisc *, unsigned long, | |
163 | struct sk_buff *skb, struct tcmsg*); | |
164 | int (*dump_stats)(struct Qdisc *, unsigned long, | |
165 | struct gnet_dump *); | |
166 | }; | |
167 | ||
fd2c3ef7 | 168 | struct Qdisc_ops { |
1da177e4 | 169 | struct Qdisc_ops *next; |
20fea08b | 170 | const struct Qdisc_class_ops *cl_ops; |
1da177e4 LT |
171 | char id[IFNAMSIZ]; |
172 | int priv_size; | |
173 | ||
520ac30f ED |
174 | int (*enqueue)(struct sk_buff *skb, |
175 | struct Qdisc *sch, | |
176 | struct sk_buff **to_free); | |
1da177e4 | 177 | struct sk_buff * (*dequeue)(struct Qdisc *); |
90d841fd | 178 | struct sk_buff * (*peek)(struct Qdisc *); |
1da177e4 | 179 | |
1e90474c | 180 | int (*init)(struct Qdisc *, struct nlattr *arg); |
1da177e4 LT |
181 | void (*reset)(struct Qdisc *); |
182 | void (*destroy)(struct Qdisc *); | |
1e90474c | 183 | int (*change)(struct Qdisc *, struct nlattr *arg); |
6ec1c69a | 184 | void (*attach)(struct Qdisc *); |
1da177e4 LT |
185 | |
186 | int (*dump)(struct Qdisc *, struct sk_buff *); | |
187 | int (*dump_stats)(struct Qdisc *, struct gnet_dump *); | |
188 | ||
189 | struct module *owner; | |
190 | }; | |
191 | ||
192 | ||
fd2c3ef7 | 193 | struct tcf_result { |
1da177e4 LT |
194 | unsigned long class; |
195 | u32 classid; | |
196 | }; | |
197 | ||
fd2c3ef7 | 198 | struct tcf_proto_ops { |
36272874 | 199 | struct list_head head; |
1da177e4 LT |
200 | char kind[IFNAMSIZ]; |
201 | ||
dc7f9f6e ED |
202 | int (*classify)(struct sk_buff *, |
203 | const struct tcf_proto *, | |
204 | struct tcf_result *); | |
1da177e4 | 205 | int (*init)(struct tcf_proto*); |
1e052be6 | 206 | bool (*destroy)(struct tcf_proto*, bool); |
1da177e4 LT |
207 | |
208 | unsigned long (*get)(struct tcf_proto*, u32 handle); | |
c1b52739 | 209 | int (*change)(struct net *net, struct sk_buff *, |
af4c6641 | 210 | struct tcf_proto*, unsigned long, |
add93b61 | 211 | u32 handle, struct nlattr **, |
2f7ef2f8 | 212 | unsigned long *, bool); |
1da177e4 LT |
213 | int (*delete)(struct tcf_proto*, unsigned long); |
214 | void (*walk)(struct tcf_proto*, struct tcf_walker *arg); | |
215 | ||
216 | /* rtnetlink specific */ | |
832d1d5b | 217 | int (*dump)(struct net*, struct tcf_proto*, unsigned long, |
1da177e4 LT |
218 | struct sk_buff *skb, struct tcmsg*); |
219 | ||
220 | struct module *owner; | |
221 | }; | |
222 | ||
fd2c3ef7 | 223 | struct tcf_proto { |
1da177e4 | 224 | /* Fast access part */ |
25d8c0d5 JF |
225 | struct tcf_proto __rcu *next; |
226 | void __rcu *root; | |
dc7f9f6e ED |
227 | int (*classify)(struct sk_buff *, |
228 | const struct tcf_proto *, | |
229 | struct tcf_result *); | |
66c6f529 | 230 | __be16 protocol; |
1da177e4 LT |
231 | |
232 | /* All the rest */ | |
233 | u32 prio; | |
234 | u32 classid; | |
235 | struct Qdisc *q; | |
236 | void *data; | |
dc7f9f6e | 237 | const struct tcf_proto_ops *ops; |
25d8c0d5 | 238 | struct rcu_head rcu; |
1da177e4 LT |
239 | }; |
240 | ||
175f9c1b JK |
241 | struct qdisc_skb_cb { |
242 | unsigned int pkt_len; | |
df4ab5b3 | 243 | u16 slave_dev_queue_mapping; |
045efa82 | 244 | u16 tc_classid; |
25711786 ED |
245 | #define QDISC_CB_PRIV_LEN 20 |
246 | unsigned char data[QDISC_CB_PRIV_LEN]; | |
175f9c1b JK |
247 | }; |
248 | ||
16bda13d DM |
249 | static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
250 | { | |
251 | struct qdisc_skb_cb *qcb; | |
5ee31c68 ED |
252 | |
253 | BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); | |
16bda13d DM |
254 | BUILD_BUG_ON(sizeof(qcb->data) < sz); |
255 | } | |
256 | ||
05bdd2f1 | 257 | static inline int qdisc_qlen(const struct Qdisc *q) |
bbd8a0d3 KK |
258 | { |
259 | return q->q.qlen; | |
260 | } | |
261 | ||
bfe0d029 | 262 | static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
175f9c1b JK |
263 | { |
264 | return (struct qdisc_skb_cb *)skb->cb; | |
265 | } | |
266 | ||
83874000 DM |
267 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
268 | { | |
269 | return &qdisc->q.lock; | |
270 | } | |
271 | ||
05bdd2f1 | 272 | static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
7698b4fc | 273 | { |
46e5da40 JF |
274 | struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
275 | ||
276 | return q; | |
7698b4fc DM |
277 | } |
278 | ||
05bdd2f1 | 279 | static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
2540e051 JP |
280 | { |
281 | return qdisc->dev_queue->qdisc_sleeping; | |
282 | } | |
283 | ||
7e43f112 DM |
284 | /* The qdisc root lock is a mechanism by which to top level |
285 | * of a qdisc tree can be locked from any qdisc node in the | |
286 | * forest. This allows changing the configuration of some | |
287 | * aspect of the qdisc tree while blocking out asynchronous | |
288 | * qdisc access in the packet processing paths. | |
289 | * | |
290 | * It is only legal to do this when the root will not change | |
291 | * on us. Otherwise we'll potentially lock the wrong qdisc | |
292 | * root. This is enforced by holding the RTNL semaphore, which | |
293 | * all users of this lock accessor must do. | |
294 | */ | |
05bdd2f1 | 295 | static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) |
7698b4fc DM |
296 | { |
297 | struct Qdisc *root = qdisc_root(qdisc); | |
298 | ||
7e43f112 | 299 | ASSERT_RTNL(); |
83874000 | 300 | return qdisc_lock(root); |
7698b4fc DM |
301 | } |
302 | ||
05bdd2f1 | 303 | static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
f6f9b93f JP |
304 | { |
305 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
306 | ||
307 | ASSERT_RTNL(); | |
308 | return qdisc_lock(root); | |
309 | } | |
310 | ||
edb09eb1 ED |
311 | static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) |
312 | { | |
313 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
314 | ||
315 | ASSERT_RTNL(); | |
316 | return &root->running; | |
317 | } | |
318 | ||
05bdd2f1 | 319 | static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) |
5ce2d488 DM |
320 | { |
321 | return qdisc->dev_queue->dev; | |
322 | } | |
1da177e4 | 323 | |
05bdd2f1 | 324 | static inline void sch_tree_lock(const struct Qdisc *q) |
78a5b30b | 325 | { |
fe439dd0 | 326 | spin_lock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
327 | } |
328 | ||
05bdd2f1 | 329 | static inline void sch_tree_unlock(const struct Qdisc *q) |
78a5b30b | 330 | { |
fe439dd0 | 331 | spin_unlock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
332 | } |
333 | ||
334 | #define tcf_tree_lock(tp) sch_tree_lock((tp)->q) | |
335 | #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q) | |
1da177e4 | 336 | |
e41a33e6 TG |
337 | extern struct Qdisc noop_qdisc; |
338 | extern struct Qdisc_ops noop_qdisc_ops; | |
6ec1c69a DM |
339 | extern struct Qdisc_ops pfifo_fast_ops; |
340 | extern struct Qdisc_ops mq_qdisc_ops; | |
d66d6c31 | 341 | extern struct Qdisc_ops noqueue_qdisc_ops; |
6da7c8fc | 342 | extern const struct Qdisc_ops *default_qdisc_ops; |
1f27cde3 ED |
343 | static inline const struct Qdisc_ops * |
344 | get_default_qdisc_ops(const struct net_device *dev, int ntx) | |
345 | { | |
346 | return ntx < dev->real_num_tx_queues ? | |
347 | default_qdisc_ops : &pfifo_fast_ops; | |
348 | } | |
e41a33e6 | 349 | |
fd2c3ef7 | 350 | struct Qdisc_class_common { |
6fe1c7a5 PM |
351 | u32 classid; |
352 | struct hlist_node hnode; | |
353 | }; | |
354 | ||
fd2c3ef7 | 355 | struct Qdisc_class_hash { |
6fe1c7a5 PM |
356 | struct hlist_head *hash; |
357 | unsigned int hashsize; | |
358 | unsigned int hashmask; | |
359 | unsigned int hashelems; | |
360 | }; | |
361 | ||
362 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
363 | { | |
364 | id ^= id >> 8; | |
365 | id ^= id >> 4; | |
366 | return id & mask; | |
367 | } | |
368 | ||
369 | static inline struct Qdisc_class_common * | |
05bdd2f1 | 370 | qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
6fe1c7a5 PM |
371 | { |
372 | struct Qdisc_class_common *cl; | |
6fe1c7a5 PM |
373 | unsigned int h; |
374 | ||
375 | h = qdisc_class_hash(id, hash->hashmask); | |
b67bfe0d | 376 | hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
6fe1c7a5 PM |
377 | if (cl->classid == id) |
378 | return cl; | |
379 | } | |
380 | return NULL; | |
381 | } | |
382 | ||
5c15257f JP |
383 | int qdisc_class_hash_init(struct Qdisc_class_hash *); |
384 | void qdisc_class_hash_insert(struct Qdisc_class_hash *, | |
385 | struct Qdisc_class_common *); | |
386 | void qdisc_class_hash_remove(struct Qdisc_class_hash *, | |
387 | struct Qdisc_class_common *); | |
388 | void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
389 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
390 | ||
391 | void dev_init_scheduler(struct net_device *dev); | |
392 | void dev_shutdown(struct net_device *dev); | |
393 | void dev_activate(struct net_device *dev); | |
394 | void dev_deactivate(struct net_device *dev); | |
395 | void dev_deactivate_many(struct list_head *head); | |
396 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
397 | struct Qdisc *qdisc); | |
398 | void qdisc_reset(struct Qdisc *qdisc); | |
399 | void qdisc_destroy(struct Qdisc *qdisc); | |
2ccccf5f WC |
400 | void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n, |
401 | unsigned int len); | |
5c15257f | 402 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d2a7f269 | 403 | const struct Qdisc_ops *ops); |
5c15257f | 404 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 405 | const struct Qdisc_ops *ops, u32 parentid); |
5c15257f JP |
406 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
407 | const struct qdisc_size_table *stab); | |
1e052be6 | 408 | bool tcf_destroy(struct tcf_proto *tp, bool force); |
25d8c0d5 | 409 | void tcf_destroy_chain(struct tcf_proto __rcu **fl); |
27b29f63 | 410 | int skb_do_redirect(struct sk_buff *); |
1da177e4 | 411 | |
a5135bcf WB |
412 | static inline void skb_reset_tc(struct sk_buff *skb) |
413 | { | |
414 | #ifdef CONFIG_NET_CLS_ACT | |
a5135bcf WB |
415 | skb->tc_from = 0; |
416 | #endif | |
417 | } | |
418 | ||
fdc5432a DB |
419 | static inline bool skb_at_tc_ingress(const struct sk_buff *skb) |
420 | { | |
421 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 422 | return skb->tc_at_ingress; |
fdc5432a DB |
423 | #else |
424 | return false; | |
425 | #endif | |
426 | } | |
427 | ||
e7246e12 WB |
428 | static inline bool skb_skip_tc_classify(struct sk_buff *skb) |
429 | { | |
430 | #ifdef CONFIG_NET_CLS_ACT | |
431 | if (skb->tc_skip_classify) { | |
432 | skb->tc_skip_classify = 0; | |
433 | return true; | |
434 | } | |
435 | #endif | |
436 | return false; | |
437 | } | |
438 | ||
f0796d5c JF |
439 | /* Reset all TX qdiscs greater then index of a device. */ |
440 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) | |
5aa70995 | 441 | { |
4ef6acff JF |
442 | struct Qdisc *qdisc; |
443 | ||
f0796d5c | 444 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 445 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
446 | if (qdisc) { |
447 | spin_lock_bh(qdisc_lock(qdisc)); | |
448 | qdisc_reset(qdisc); | |
449 | spin_unlock_bh(qdisc_lock(qdisc)); | |
450 | } | |
451 | } | |
5aa70995 DM |
452 | } |
453 | ||
5aa70995 DM |
454 | static inline void qdisc_reset_all_tx(struct net_device *dev) |
455 | { | |
f0796d5c | 456 | qdisc_reset_all_tx_gt(dev, 0); |
5aa70995 DM |
457 | } |
458 | ||
3e745dd6 DM |
459 | /* Are all TX queues of the device empty? */ |
460 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
461 | { | |
e8a0464c | 462 | unsigned int i; |
46e5da40 JF |
463 | |
464 | rcu_read_lock(); | |
e8a0464c DM |
465 | for (i = 0; i < dev->num_tx_queues; i++) { |
466 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 467 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 468 | |
46e5da40 JF |
469 | if (q->q.qlen) { |
470 | rcu_read_unlock(); | |
e8a0464c | 471 | return false; |
46e5da40 | 472 | } |
e8a0464c | 473 | } |
46e5da40 | 474 | rcu_read_unlock(); |
e8a0464c | 475 | return true; |
3e745dd6 DM |
476 | } |
477 | ||
6fa9864b | 478 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 479 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 480 | { |
e8a0464c | 481 | unsigned int i; |
46e5da40 | 482 | |
e8a0464c DM |
483 | for (i = 0; i < dev->num_tx_queues; i++) { |
484 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 485 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
486 | return true; |
487 | } | |
488 | return false; | |
6fa9864b DM |
489 | } |
490 | ||
e8a0464c | 491 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
492 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
493 | { | |
e8a0464c | 494 | unsigned int i; |
46e5da40 | 495 | |
e8a0464c DM |
496 | for (i = 0; i < dev->num_tx_queues; i++) { |
497 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 498 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
e8a0464c DM |
499 | return false; |
500 | } | |
501 | return true; | |
05297949 DM |
502 | } |
503 | ||
bfe0d029 | 504 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 505 | { |
175f9c1b | 506 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
507 | } |
508 | ||
c27f339a | 509 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
510 | enum net_xmit_qdisc_t { |
511 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 512 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
513 | }; |
514 | ||
c27f339a | 515 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 516 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
517 | #else |
518 | #define net_xmit_drop_count(e) (1) | |
519 | #endif | |
520 | ||
a2da570d ED |
521 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
522 | const struct Qdisc *sch) | |
5f86173b | 523 | { |
3a682fbd | 524 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
525 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
526 | ||
527 | if (stab) | |
528 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 529 | #endif |
a2da570d ED |
530 | } |
531 | ||
520ac30f ED |
532 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
533 | struct sk_buff **to_free) | |
a2da570d ED |
534 | { |
535 | qdisc_calculate_pkt_len(skb, sch); | |
520ac30f | 536 | return sch->enqueue(skb, sch, to_free); |
5f86173b JK |
537 | } |
538 | ||
22e0f8b9 JF |
539 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
540 | { | |
541 | return q->flags & TCQ_F_CPUSTATS; | |
542 | } | |
bfe0d029 | 543 | |
38040702 AV |
544 | static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, |
545 | __u64 bytes, __u32 packets) | |
546 | { | |
547 | bstats->bytes += bytes; | |
548 | bstats->packets += packets; | |
549 | } | |
550 | ||
bfe0d029 ED |
551 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, |
552 | const struct sk_buff *skb) | |
553 | { | |
38040702 AV |
554 | _bstats_update(bstats, |
555 | qdisc_pkt_len(skb), | |
556 | skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); | |
557 | } | |
558 | ||
559 | static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, | |
560 | __u64 bytes, __u32 packets) | |
561 | { | |
562 | u64_stats_update_begin(&bstats->syncp); | |
563 | _bstats_update(&bstats->bstats, bytes, packets); | |
564 | u64_stats_update_end(&bstats->syncp); | |
bfe0d029 ED |
565 | } |
566 | ||
24ea591d ED |
567 | static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, |
568 | const struct sk_buff *skb) | |
22e0f8b9 | 569 | { |
22e0f8b9 JF |
570 | u64_stats_update_begin(&bstats->syncp); |
571 | bstats_update(&bstats->bstats, skb); | |
572 | u64_stats_update_end(&bstats->syncp); | |
573 | } | |
574 | ||
24ea591d ED |
575 | static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
576 | const struct sk_buff *skb) | |
577 | { | |
578 | bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); | |
579 | } | |
580 | ||
bfe0d029 ED |
581 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
582 | const struct sk_buff *skb) | |
bbd8a0d3 | 583 | { |
bfe0d029 | 584 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
585 | } |
586 | ||
25331d6c JF |
587 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
588 | const struct sk_buff *skb) | |
589 | { | |
590 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
591 | } | |
592 | ||
593 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, | |
594 | const struct sk_buff *skb) | |
595 | { | |
596 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
597 | } | |
598 | ||
599 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) | |
600 | { | |
601 | sch->qstats.drops += count; | |
602 | } | |
603 | ||
24ea591d | 604 | static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
25331d6c | 605 | { |
24ea591d | 606 | qstats->drops++; |
25331d6c JF |
607 | } |
608 | ||
24ea591d | 609 | static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
b0ab6f92 | 610 | { |
24ea591d ED |
611 | qstats->overlimits++; |
612 | } | |
b0ab6f92 | 613 | |
24ea591d ED |
614 | static inline void qdisc_qstats_drop(struct Qdisc *sch) |
615 | { | |
616 | qstats_drop_inc(&sch->qstats); | |
617 | } | |
618 | ||
619 | static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) | |
620 | { | |
eb60a8dd | 621 | this_cpu_inc(sch->cpu_qstats->drops); |
b0ab6f92 JF |
622 | } |
623 | ||
25331d6c JF |
624 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
625 | { | |
626 | sch->qstats.overlimits++; | |
627 | } | |
628 | ||
48da34b7 FW |
629 | static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh) |
630 | { | |
631 | qh->head = NULL; | |
632 | qh->tail = NULL; | |
633 | qh->qlen = 0; | |
634 | } | |
635 | ||
9972b25d | 636 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
48da34b7 | 637 | struct qdisc_skb_head *qh) |
9972b25d | 638 | { |
48da34b7 FW |
639 | struct sk_buff *last = qh->tail; |
640 | ||
641 | if (last) { | |
642 | skb->next = NULL; | |
643 | last->next = skb; | |
644 | qh->tail = skb; | |
645 | } else { | |
646 | qh->tail = skb; | |
647 | qh->head = skb; | |
648 | } | |
649 | qh->qlen++; | |
25331d6c | 650 | qdisc_qstats_backlog_inc(sch, skb); |
9972b25d TG |
651 | |
652 | return NET_XMIT_SUCCESS; | |
653 | } | |
654 | ||
655 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
656 | { | |
657 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
658 | } | |
659 | ||
48da34b7 | 660 | static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) |
9972b25d | 661 | { |
48da34b7 FW |
662 | struct sk_buff *skb = qh->head; |
663 | ||
664 | if (likely(skb != NULL)) { | |
665 | qh->head = skb->next; | |
666 | qh->qlen--; | |
667 | if (qh->head == NULL) | |
668 | qh->tail = NULL; | |
669 | skb->next = NULL; | |
670 | } | |
9972b25d | 671 | |
ec323368 FW |
672 | return skb; |
673 | } | |
674 | ||
675 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
676 | { | |
677 | struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); | |
678 | ||
9190b3b3 | 679 | if (likely(skb != NULL)) { |
25331d6c | 680 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
681 | qdisc_bstats_update(sch, skb); |
682 | } | |
9972b25d TG |
683 | |
684 | return skb; | |
685 | } | |
686 | ||
520ac30f ED |
687 | /* Instead of calling kfree_skb() while root qdisc lock is held, |
688 | * queue the skb for future freeing at end of __dev_xmit_skb() | |
689 | */ | |
690 | static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) | |
691 | { | |
692 | skb->next = *to_free; | |
693 | *to_free = skb; | |
694 | } | |
695 | ||
57dbb2d8 | 696 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, |
48da34b7 | 697 | struct qdisc_skb_head *qh, |
520ac30f | 698 | struct sk_buff **to_free) |
57dbb2d8 | 699 | { |
48da34b7 | 700 | struct sk_buff *skb = __qdisc_dequeue_head(qh); |
57dbb2d8 HPP |
701 | |
702 | if (likely(skb != NULL)) { | |
703 | unsigned int len = qdisc_pkt_len(skb); | |
520ac30f | 704 | |
25331d6c | 705 | qdisc_qstats_backlog_dec(sch, skb); |
520ac30f | 706 | __qdisc_drop(skb, to_free); |
57dbb2d8 HPP |
707 | return len; |
708 | } | |
709 | ||
710 | return 0; | |
711 | } | |
712 | ||
520ac30f ED |
713 | static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch, |
714 | struct sk_buff **to_free) | |
57dbb2d8 | 715 | { |
520ac30f | 716 | return __qdisc_queue_drop_head(sch, &sch->q, to_free); |
9972b25d TG |
717 | } |
718 | ||
48a8f519 PM |
719 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
720 | { | |
48da34b7 FW |
721 | const struct qdisc_skb_head *qh = &sch->q; |
722 | ||
723 | return qh->head; | |
48a8f519 PM |
724 | } |
725 | ||
77be155c JP |
726 | /* generic pseudo peek method for non-work-conserving qdisc */ |
727 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
728 | { | |
729 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ | |
61c9eaf9 | 730 | if (!sch->gso_skb) { |
77be155c | 731 | sch->gso_skb = sch->dequeue(sch); |
a27758ff | 732 | if (sch->gso_skb) { |
61c9eaf9 | 733 | /* it's still part of the queue */ |
a27758ff | 734 | qdisc_qstats_backlog_inc(sch, sch->gso_skb); |
61c9eaf9 | 735 | sch->q.qlen++; |
a27758ff | 736 | } |
61c9eaf9 | 737 | } |
77be155c JP |
738 | |
739 | return sch->gso_skb; | |
740 | } | |
741 | ||
742 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
743 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
744 | { | |
745 | struct sk_buff *skb = sch->gso_skb; | |
746 | ||
61c9eaf9 | 747 | if (skb) { |
77be155c | 748 | sch->gso_skb = NULL; |
a27758ff | 749 | qdisc_qstats_backlog_dec(sch, skb); |
61c9eaf9 JP |
750 | sch->q.qlen--; |
751 | } else { | |
77be155c | 752 | skb = sch->dequeue(sch); |
61c9eaf9 | 753 | } |
77be155c JP |
754 | |
755 | return skb; | |
756 | } | |
757 | ||
48da34b7 | 758 | static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) |
9972b25d TG |
759 | { |
760 | /* | |
761 | * We do not know the backlog in bytes of this list, it | |
762 | * is up to the caller to correct it | |
763 | */ | |
48da34b7 FW |
764 | ASSERT_RTNL(); |
765 | if (qh->qlen) { | |
766 | rtnl_kfree_skbs(qh->head, qh->tail); | |
767 | ||
768 | qh->head = NULL; | |
769 | qh->tail = NULL; | |
770 | qh->qlen = 0; | |
1b5c5493 | 771 | } |
9972b25d TG |
772 | } |
773 | ||
774 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
775 | { | |
1b5c5493 | 776 | __qdisc_reset_queue(&sch->q); |
9972b25d TG |
777 | sch->qstats.backlog = 0; |
778 | } | |
779 | ||
86a7996c WC |
780 | static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, |
781 | struct Qdisc **pold) | |
782 | { | |
783 | struct Qdisc *old; | |
784 | ||
785 | sch_tree_lock(sch); | |
786 | old = *pold; | |
787 | *pold = new; | |
788 | if (old != NULL) { | |
2ccccf5f | 789 | qdisc_tree_reduce_backlog(old, old->q.qlen, old->qstats.backlog); |
86a7996c WC |
790 | qdisc_reset(old); |
791 | } | |
792 | sch_tree_unlock(sch); | |
793 | ||
794 | return old; | |
795 | } | |
796 | ||
1b5c5493 ED |
797 | static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) |
798 | { | |
799 | rtnl_kfree_skbs(skb, skb); | |
800 | qdisc_qstats_drop(sch); | |
801 | } | |
802 | ||
520ac30f ED |
803 | |
804 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, | |
805 | struct sk_buff **to_free) | |
9972b25d | 806 | { |
520ac30f | 807 | __qdisc_drop(skb, to_free); |
25331d6c | 808 | qdisc_qstats_drop(sch); |
9972b25d TG |
809 | |
810 | return NET_XMIT_DROP; | |
811 | } | |
812 | ||
e9bef55d JDB |
813 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
814 | long it will take to send a packet given its size. | |
815 | */ | |
816 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
817 | { | |
e08b0998 JDB |
818 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
819 | if (slot < 0) | |
820 | slot = 0; | |
e9bef55d JDB |
821 | slot >>= rtab->rate.cell_log; |
822 | if (slot > 255) | |
a02cec21 | 823 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
824 | return rtab->data[slot]; |
825 | } | |
826 | ||
292f1c7f | 827 | struct psched_ratecfg { |
130d3d68 | 828 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
829 | u32 mult; |
830 | u16 overhead; | |
8a8e3d84 | 831 | u8 linklayer; |
01cb71d2 | 832 | u8 shift; |
292f1c7f JP |
833 | }; |
834 | ||
835 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
836 | unsigned int len) | |
837 | { | |
8a8e3d84 JDB |
838 | len += r->overhead; |
839 | ||
840 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
841 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
842 | ||
843 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
844 | } |
845 | ||
5c15257f | 846 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
847 | const struct tc_ratespec *conf, |
848 | u64 rate64); | |
292f1c7f | 849 | |
01cb71d2 ED |
850 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
851 | const struct psched_ratecfg *r) | |
292f1c7f | 852 | { |
01cb71d2 | 853 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
854 | |
855 | /* legacy struct tc_ratespec has a 32bit @rate field | |
856 | * Qdisc using 64bit rate should add new attributes | |
857 | * in order to maintain compatibility. | |
858 | */ | |
859 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
860 | ||
01cb71d2 | 861 | res->overhead = r->overhead; |
8a8e3d84 | 862 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
863 | } |
864 | ||
1da177e4 | 865 | #endif |