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, |
ef352e7c | 29 | __QDISC_STATE_THROTTLED, |
e2627c8c DM |
30 | }; |
31 | ||
37112105 ED |
32 | /* |
33 | * following bits are only changed while qdisc lock is held | |
34 | */ | |
35 | enum qdisc___state_t { | |
fd245a4a | 36 | __QDISC___STATE_RUNNING = 1, |
37112105 ED |
37 | }; |
38 | ||
175f9c1b | 39 | struct qdisc_size_table { |
a2da570d | 40 | struct rcu_head rcu; |
175f9c1b JK |
41 | struct list_head list; |
42 | struct tc_sizespec szopts; | |
43 | int refcnt; | |
44 | u16 data[]; | |
45 | }; | |
46 | ||
fd2c3ef7 | 47 | struct Qdisc { |
1da177e4 LT |
48 | int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev); |
49 | struct sk_buff * (*dequeue)(struct Qdisc *dev); | |
05bdd2f1 | 50 | unsigned int flags; |
b00355db | 51 | #define TCQ_F_BUILTIN 1 |
fd245a4a ED |
52 | #define TCQ_F_INGRESS 2 |
53 | #define TCQ_F_CAN_BYPASS 4 | |
54 | #define TCQ_F_MQROOT 8 | |
1abbe139 ED |
55 | #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for |
56 | * q->dev_queue : It can test | |
57 | * netif_xmit_frozen_or_stopped() before | |
58 | * dequeueing next packet. | |
59 | * Its true for MQ/MQPRIO slaves, or non | |
60 | * multiqueue device. | |
61 | */ | |
b00355db | 62 | #define TCQ_F_WARN_NONWC (1 << 16) |
22e0f8b9 | 63 | #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ |
45203a3b | 64 | u32 limit; |
05bdd2f1 | 65 | const struct Qdisc_ops *ops; |
a2da570d | 66 | struct qdisc_size_table __rcu *stab; |
5e140dfc | 67 | struct list_head list; |
1da177e4 LT |
68 | u32 handle; |
69 | u32 parent; | |
1da177e4 LT |
70 | int (*reshape_fail)(struct sk_buff *skb, |
71 | struct Qdisc *q); | |
72 | ||
72b25a91 DM |
73 | void *u32_node; |
74 | ||
1da177e4 LT |
75 | /* This field is deprecated, but it is still used by CBQ |
76 | * and it will live until better solution will be invented. | |
77 | */ | |
78 | struct Qdisc *__parent; | |
5e140dfc | 79 | struct netdev_queue *dev_queue; |
5e140dfc | 80 | |
45203a3b ED |
81 | struct gnet_stats_rate_est64 rate_est; |
82 | struct Qdisc *next_sched; | |
5e140dfc ED |
83 | struct sk_buff *gso_skb; |
84 | /* | |
85 | * For performance sake on SMP, we put highly modified fields at the end | |
86 | */ | |
87 | unsigned long state; | |
88 | struct sk_buff_head q; | |
22e0f8b9 JF |
89 | union { |
90 | struct gnet_stats_basic_packed bstats; | |
91 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; | |
92 | } __packed; | |
fd245a4a | 93 | unsigned int __state; |
b0ab6f92 JF |
94 | union { |
95 | struct gnet_stats_queue qstats; | |
96 | struct gnet_stats_queue __percpu *cpu_qstats; | |
97 | } __packed; | |
79640a4c | 98 | struct rcu_head rcu_head; |
45203a3b ED |
99 | int padded; |
100 | atomic_t refcnt; | |
101 | ||
102 | spinlock_t busylock ____cacheline_aligned_in_smp; | |
1da177e4 LT |
103 | }; |
104 | ||
fd245a4a | 105 | static inline bool qdisc_is_running(const struct Qdisc *qdisc) |
bc135b23 | 106 | { |
fd245a4a | 107 | return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false; |
bc135b23 ED |
108 | } |
109 | ||
110 | static inline bool qdisc_run_begin(struct Qdisc *qdisc) | |
111 | { | |
fd245a4a ED |
112 | if (qdisc_is_running(qdisc)) |
113 | return false; | |
114 | qdisc->__state |= __QDISC___STATE_RUNNING; | |
115 | return true; | |
bc135b23 ED |
116 | } |
117 | ||
118 | static inline void qdisc_run_end(struct Qdisc *qdisc) | |
119 | { | |
fd245a4a ED |
120 | qdisc->__state &= ~__QDISC___STATE_RUNNING; |
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 | ||
fd245a4a ED |
138 | static inline bool qdisc_is_throttled(const struct Qdisc *qdisc) |
139 | { | |
ef352e7c | 140 | return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false; |
fd245a4a ED |
141 | } |
142 | ||
143 | static inline void qdisc_throttled(struct Qdisc *qdisc) | |
144 | { | |
ef352e7c | 145 | set_bit(__QDISC_STATE_THROTTLED, &qdisc->state); |
fd245a4a ED |
146 | } |
147 | ||
148 | static inline void qdisc_unthrottled(struct Qdisc *qdisc) | |
149 | { | |
ef352e7c | 150 | clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state); |
bc135b23 ED |
151 | } |
152 | ||
fd2c3ef7 | 153 | struct Qdisc_class_ops { |
1da177e4 | 154 | /* Child qdisc manipulation */ |
926e61b7 | 155 | struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); |
1da177e4 LT |
156 | int (*graft)(struct Qdisc *, unsigned long cl, |
157 | struct Qdisc *, struct Qdisc **); | |
158 | struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); | |
43effa1e | 159 | void (*qlen_notify)(struct Qdisc *, unsigned long); |
1da177e4 LT |
160 | |
161 | /* Class manipulation routines */ | |
162 | unsigned long (*get)(struct Qdisc *, u32 classid); | |
163 | void (*put)(struct Qdisc *, unsigned long); | |
164 | int (*change)(struct Qdisc *, u32, u32, | |
1e90474c | 165 | struct nlattr **, unsigned long *); |
1da177e4 LT |
166 | int (*delete)(struct Qdisc *, unsigned long); |
167 | void (*walk)(struct Qdisc *, struct qdisc_walker * arg); | |
168 | ||
169 | /* Filter manipulation */ | |
25d8c0d5 | 170 | struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long); |
1da177e4 LT |
171 | unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, |
172 | u32 classid); | |
173 | void (*unbind_tcf)(struct Qdisc *, unsigned long); | |
174 | ||
175 | /* rtnetlink specific */ | |
176 | int (*dump)(struct Qdisc *, unsigned long, | |
177 | struct sk_buff *skb, struct tcmsg*); | |
178 | int (*dump_stats)(struct Qdisc *, unsigned long, | |
179 | struct gnet_dump *); | |
180 | }; | |
181 | ||
fd2c3ef7 | 182 | struct Qdisc_ops { |
1da177e4 | 183 | struct Qdisc_ops *next; |
20fea08b | 184 | const struct Qdisc_class_ops *cl_ops; |
1da177e4 LT |
185 | char id[IFNAMSIZ]; |
186 | int priv_size; | |
187 | ||
188 | int (*enqueue)(struct sk_buff *, struct Qdisc *); | |
189 | struct sk_buff * (*dequeue)(struct Qdisc *); | |
90d841fd | 190 | struct sk_buff * (*peek)(struct Qdisc *); |
1da177e4 LT |
191 | unsigned int (*drop)(struct Qdisc *); |
192 | ||
1e90474c | 193 | int (*init)(struct Qdisc *, struct nlattr *arg); |
1da177e4 LT |
194 | void (*reset)(struct Qdisc *); |
195 | void (*destroy)(struct Qdisc *); | |
1e90474c | 196 | int (*change)(struct Qdisc *, struct nlattr *arg); |
6ec1c69a | 197 | void (*attach)(struct Qdisc *); |
1da177e4 LT |
198 | |
199 | int (*dump)(struct Qdisc *, struct sk_buff *); | |
200 | int (*dump_stats)(struct Qdisc *, struct gnet_dump *); | |
201 | ||
202 | struct module *owner; | |
203 | }; | |
204 | ||
205 | ||
fd2c3ef7 | 206 | struct tcf_result { |
1da177e4 LT |
207 | unsigned long class; |
208 | u32 classid; | |
209 | }; | |
210 | ||
fd2c3ef7 | 211 | struct tcf_proto_ops { |
36272874 | 212 | struct list_head head; |
1da177e4 LT |
213 | char kind[IFNAMSIZ]; |
214 | ||
dc7f9f6e ED |
215 | int (*classify)(struct sk_buff *, |
216 | const struct tcf_proto *, | |
217 | struct tcf_result *); | |
1da177e4 LT |
218 | int (*init)(struct tcf_proto*); |
219 | void (*destroy)(struct tcf_proto*); | |
220 | ||
221 | unsigned long (*get)(struct tcf_proto*, u32 handle); | |
c1b52739 | 222 | int (*change)(struct net *net, struct sk_buff *, |
af4c6641 | 223 | struct tcf_proto*, unsigned long, |
add93b61 | 224 | u32 handle, struct nlattr **, |
2f7ef2f8 | 225 | unsigned long *, bool); |
1da177e4 LT |
226 | int (*delete)(struct tcf_proto*, unsigned long); |
227 | void (*walk)(struct tcf_proto*, struct tcf_walker *arg); | |
228 | ||
229 | /* rtnetlink specific */ | |
832d1d5b | 230 | int (*dump)(struct net*, struct tcf_proto*, unsigned long, |
1da177e4 LT |
231 | struct sk_buff *skb, struct tcmsg*); |
232 | ||
233 | struct module *owner; | |
234 | }; | |
235 | ||
fd2c3ef7 | 236 | struct tcf_proto { |
1da177e4 | 237 | /* Fast access part */ |
25d8c0d5 JF |
238 | struct tcf_proto __rcu *next; |
239 | void __rcu *root; | |
dc7f9f6e ED |
240 | int (*classify)(struct sk_buff *, |
241 | const struct tcf_proto *, | |
242 | struct tcf_result *); | |
66c6f529 | 243 | __be16 protocol; |
1da177e4 LT |
244 | |
245 | /* All the rest */ | |
246 | u32 prio; | |
247 | u32 classid; | |
248 | struct Qdisc *q; | |
249 | void *data; | |
dc7f9f6e | 250 | const struct tcf_proto_ops *ops; |
25d8c0d5 | 251 | struct rcu_head rcu; |
1da177e4 LT |
252 | }; |
253 | ||
175f9c1b JK |
254 | struct qdisc_skb_cb { |
255 | unsigned int pkt_len; | |
df4ab5b3 | 256 | u16 slave_dev_queue_mapping; |
5ee31c68 | 257 | u16 _pad; |
25711786 ED |
258 | #define QDISC_CB_PRIV_LEN 20 |
259 | unsigned char data[QDISC_CB_PRIV_LEN]; | |
175f9c1b JK |
260 | }; |
261 | ||
16bda13d DM |
262 | static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
263 | { | |
264 | struct qdisc_skb_cb *qcb; | |
5ee31c68 ED |
265 | |
266 | BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); | |
16bda13d DM |
267 | BUILD_BUG_ON(sizeof(qcb->data) < sz); |
268 | } | |
269 | ||
05bdd2f1 | 270 | static inline int qdisc_qlen(const struct Qdisc *q) |
bbd8a0d3 KK |
271 | { |
272 | return q->q.qlen; | |
273 | } | |
274 | ||
bfe0d029 | 275 | static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
175f9c1b JK |
276 | { |
277 | return (struct qdisc_skb_cb *)skb->cb; | |
278 | } | |
279 | ||
83874000 DM |
280 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
281 | { | |
282 | return &qdisc->q.lock; | |
283 | } | |
284 | ||
05bdd2f1 | 285 | static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
7698b4fc | 286 | { |
46e5da40 JF |
287 | struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
288 | ||
289 | return q; | |
7698b4fc DM |
290 | } |
291 | ||
05bdd2f1 | 292 | static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
2540e051 JP |
293 | { |
294 | return qdisc->dev_queue->qdisc_sleeping; | |
295 | } | |
296 | ||
7e43f112 DM |
297 | /* The qdisc root lock is a mechanism by which to top level |
298 | * of a qdisc tree can be locked from any qdisc node in the | |
299 | * forest. This allows changing the configuration of some | |
300 | * aspect of the qdisc tree while blocking out asynchronous | |
301 | * qdisc access in the packet processing paths. | |
302 | * | |
303 | * It is only legal to do this when the root will not change | |
304 | * on us. Otherwise we'll potentially lock the wrong qdisc | |
305 | * root. This is enforced by holding the RTNL semaphore, which | |
306 | * all users of this lock accessor must do. | |
307 | */ | |
05bdd2f1 | 308 | static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) |
7698b4fc DM |
309 | { |
310 | struct Qdisc *root = qdisc_root(qdisc); | |
311 | ||
7e43f112 | 312 | ASSERT_RTNL(); |
83874000 | 313 | return qdisc_lock(root); |
7698b4fc DM |
314 | } |
315 | ||
05bdd2f1 | 316 | static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
f6f9b93f JP |
317 | { |
318 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
319 | ||
320 | ASSERT_RTNL(); | |
321 | return qdisc_lock(root); | |
322 | } | |
323 | ||
05bdd2f1 | 324 | static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) |
5ce2d488 DM |
325 | { |
326 | return qdisc->dev_queue->dev; | |
327 | } | |
1da177e4 | 328 | |
05bdd2f1 | 329 | static inline void sch_tree_lock(const struct Qdisc *q) |
78a5b30b | 330 | { |
fe439dd0 | 331 | spin_lock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
332 | } |
333 | ||
05bdd2f1 | 334 | static inline void sch_tree_unlock(const struct Qdisc *q) |
78a5b30b | 335 | { |
fe439dd0 | 336 | spin_unlock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
337 | } |
338 | ||
339 | #define tcf_tree_lock(tp) sch_tree_lock((tp)->q) | |
340 | #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q) | |
1da177e4 | 341 | |
e41a33e6 TG |
342 | extern struct Qdisc noop_qdisc; |
343 | extern struct Qdisc_ops noop_qdisc_ops; | |
6ec1c69a DM |
344 | extern struct Qdisc_ops pfifo_fast_ops; |
345 | extern struct Qdisc_ops mq_qdisc_ops; | |
6da7c8fc | 346 | extern const struct Qdisc_ops *default_qdisc_ops; |
e41a33e6 | 347 | |
fd2c3ef7 | 348 | struct Qdisc_class_common { |
6fe1c7a5 PM |
349 | u32 classid; |
350 | struct hlist_node hnode; | |
351 | }; | |
352 | ||
fd2c3ef7 | 353 | struct Qdisc_class_hash { |
6fe1c7a5 PM |
354 | struct hlist_head *hash; |
355 | unsigned int hashsize; | |
356 | unsigned int hashmask; | |
357 | unsigned int hashelems; | |
358 | }; | |
359 | ||
360 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
361 | { | |
362 | id ^= id >> 8; | |
363 | id ^= id >> 4; | |
364 | return id & mask; | |
365 | } | |
366 | ||
367 | static inline struct Qdisc_class_common * | |
05bdd2f1 | 368 | qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
6fe1c7a5 PM |
369 | { |
370 | struct Qdisc_class_common *cl; | |
6fe1c7a5 PM |
371 | unsigned int h; |
372 | ||
373 | h = qdisc_class_hash(id, hash->hashmask); | |
b67bfe0d | 374 | hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
6fe1c7a5 PM |
375 | if (cl->classid == id) |
376 | return cl; | |
377 | } | |
378 | return NULL; | |
379 | } | |
380 | ||
5c15257f JP |
381 | int qdisc_class_hash_init(struct Qdisc_class_hash *); |
382 | void qdisc_class_hash_insert(struct Qdisc_class_hash *, | |
383 | struct Qdisc_class_common *); | |
384 | void qdisc_class_hash_remove(struct Qdisc_class_hash *, | |
385 | struct Qdisc_class_common *); | |
386 | void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
387 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
388 | ||
389 | void dev_init_scheduler(struct net_device *dev); | |
390 | void dev_shutdown(struct net_device *dev); | |
391 | void dev_activate(struct net_device *dev); | |
392 | void dev_deactivate(struct net_device *dev); | |
393 | void dev_deactivate_many(struct list_head *head); | |
394 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
395 | struct Qdisc *qdisc); | |
396 | void qdisc_reset(struct Qdisc *qdisc); | |
397 | void qdisc_destroy(struct Qdisc *qdisc); | |
398 | void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n); | |
399 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, | |
d2a7f269 | 400 | const struct Qdisc_ops *ops); |
5c15257f | 401 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 402 | const struct Qdisc_ops *ops, u32 parentid); |
5c15257f JP |
403 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
404 | const struct qdisc_size_table *stab); | |
405 | void tcf_destroy(struct tcf_proto *tp); | |
25d8c0d5 | 406 | void tcf_destroy_chain(struct tcf_proto __rcu **fl); |
1da177e4 | 407 | |
f0796d5c JF |
408 | /* Reset all TX qdiscs greater then index of a device. */ |
409 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) | |
5aa70995 | 410 | { |
4ef6acff JF |
411 | struct Qdisc *qdisc; |
412 | ||
f0796d5c | 413 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 414 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
415 | if (qdisc) { |
416 | spin_lock_bh(qdisc_lock(qdisc)); | |
417 | qdisc_reset(qdisc); | |
418 | spin_unlock_bh(qdisc_lock(qdisc)); | |
419 | } | |
420 | } | |
5aa70995 DM |
421 | } |
422 | ||
5aa70995 DM |
423 | static inline void qdisc_reset_all_tx(struct net_device *dev) |
424 | { | |
f0796d5c | 425 | qdisc_reset_all_tx_gt(dev, 0); |
5aa70995 DM |
426 | } |
427 | ||
3e745dd6 DM |
428 | /* Are all TX queues of the device empty? */ |
429 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
430 | { | |
e8a0464c | 431 | unsigned int i; |
46e5da40 JF |
432 | |
433 | rcu_read_lock(); | |
e8a0464c DM |
434 | for (i = 0; i < dev->num_tx_queues; i++) { |
435 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 436 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 437 | |
46e5da40 JF |
438 | if (q->q.qlen) { |
439 | rcu_read_unlock(); | |
e8a0464c | 440 | return false; |
46e5da40 | 441 | } |
e8a0464c | 442 | } |
46e5da40 | 443 | rcu_read_unlock(); |
e8a0464c | 444 | return true; |
3e745dd6 DM |
445 | } |
446 | ||
6fa9864b | 447 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 448 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 449 | { |
e8a0464c | 450 | unsigned int i; |
46e5da40 | 451 | |
e8a0464c DM |
452 | for (i = 0; i < dev->num_tx_queues; i++) { |
453 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 454 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
455 | return true; |
456 | } | |
457 | return false; | |
6fa9864b DM |
458 | } |
459 | ||
e8a0464c | 460 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
461 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
462 | { | |
e8a0464c | 463 | unsigned int i; |
46e5da40 | 464 | |
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 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
e8a0464c DM |
468 | return false; |
469 | } | |
470 | return true; | |
05297949 DM |
471 | } |
472 | ||
bfe0d029 | 473 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 474 | { |
175f9c1b | 475 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
476 | } |
477 | ||
c27f339a | 478 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
479 | enum net_xmit_qdisc_t { |
480 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 481 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
482 | }; |
483 | ||
c27f339a | 484 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 485 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
486 | #else |
487 | #define net_xmit_drop_count(e) (1) | |
488 | #endif | |
489 | ||
a2da570d ED |
490 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
491 | const struct Qdisc *sch) | |
5f86173b | 492 | { |
3a682fbd | 493 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
494 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
495 | ||
496 | if (stab) | |
497 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 498 | #endif |
a2da570d ED |
499 | } |
500 | ||
501 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch) | |
502 | { | |
503 | qdisc_calculate_pkt_len(skb, sch); | |
5f86173b JK |
504 | return sch->enqueue(skb, sch); |
505 | } | |
506 | ||
507 | static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch) | |
508 | { | |
175f9c1b | 509 | qdisc_skb_cb(skb)->pkt_len = skb->len; |
378a2f09 | 510 | return qdisc_enqueue(skb, sch) & NET_XMIT_MASK; |
5f86173b JK |
511 | } |
512 | ||
22e0f8b9 JF |
513 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
514 | { | |
515 | return q->flags & TCQ_F_CPUSTATS; | |
516 | } | |
bfe0d029 ED |
517 | |
518 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, | |
519 | const struct sk_buff *skb) | |
520 | { | |
521 | bstats->bytes += qdisc_pkt_len(skb); | |
522 | bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1; | |
523 | } | |
524 | ||
22e0f8b9 JF |
525 | static inline void qdisc_bstats_update_cpu(struct Qdisc *sch, |
526 | const struct sk_buff *skb) | |
527 | { | |
528 | struct gnet_stats_basic_cpu *bstats = | |
529 | this_cpu_ptr(sch->cpu_bstats); | |
530 | ||
531 | u64_stats_update_begin(&bstats->syncp); | |
532 | bstats_update(&bstats->bstats, skb); | |
533 | u64_stats_update_end(&bstats->syncp); | |
534 | } | |
535 | ||
bfe0d029 ED |
536 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
537 | const struct sk_buff *skb) | |
bbd8a0d3 | 538 | { |
bfe0d029 | 539 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
540 | } |
541 | ||
25331d6c JF |
542 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
543 | const struct sk_buff *skb) | |
544 | { | |
545 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
546 | } | |
547 | ||
548 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, | |
549 | const struct sk_buff *skb) | |
550 | { | |
551 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
552 | } | |
553 | ||
554 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) | |
555 | { | |
556 | sch->qstats.drops += count; | |
557 | } | |
558 | ||
559 | static inline void qdisc_qstats_drop(struct Qdisc *sch) | |
560 | { | |
561 | sch->qstats.drops++; | |
562 | } | |
563 | ||
b0ab6f92 JF |
564 | static inline void qdisc_qstats_drop_cpu(struct Qdisc *sch) |
565 | { | |
566 | struct gnet_stats_queue *qstats = this_cpu_ptr(sch->cpu_qstats); | |
567 | ||
568 | qstats->drops++; | |
569 | } | |
570 | ||
25331d6c JF |
571 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
572 | { | |
573 | sch->qstats.overlimits++; | |
574 | } | |
575 | ||
9972b25d TG |
576 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
577 | struct sk_buff_head *list) | |
578 | { | |
579 | __skb_queue_tail(list, skb); | |
25331d6c | 580 | qdisc_qstats_backlog_inc(sch, skb); |
9972b25d TG |
581 | |
582 | return NET_XMIT_SUCCESS; | |
583 | } | |
584 | ||
585 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
586 | { | |
587 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
588 | } | |
589 | ||
590 | static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch, | |
591 | struct sk_buff_head *list) | |
592 | { | |
593 | struct sk_buff *skb = __skb_dequeue(list); | |
594 | ||
9190b3b3 | 595 | if (likely(skb != NULL)) { |
25331d6c | 596 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
597 | qdisc_bstats_update(sch, skb); |
598 | } | |
9972b25d TG |
599 | |
600 | return skb; | |
601 | } | |
602 | ||
603 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
604 | { | |
605 | return __qdisc_dequeue_head(sch, &sch->q); | |
57dbb2d8 HPP |
606 | } |
607 | ||
608 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, | |
609 | struct sk_buff_head *list) | |
610 | { | |
9190b3b3 | 611 | struct sk_buff *skb = __skb_dequeue(list); |
57dbb2d8 HPP |
612 | |
613 | if (likely(skb != NULL)) { | |
614 | unsigned int len = qdisc_pkt_len(skb); | |
25331d6c | 615 | qdisc_qstats_backlog_dec(sch, skb); |
57dbb2d8 HPP |
616 | kfree_skb(skb); |
617 | return len; | |
618 | } | |
619 | ||
620 | return 0; | |
621 | } | |
622 | ||
623 | static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch) | |
624 | { | |
625 | return __qdisc_queue_drop_head(sch, &sch->q); | |
9972b25d TG |
626 | } |
627 | ||
628 | static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch, | |
629 | struct sk_buff_head *list) | |
630 | { | |
631 | struct sk_buff *skb = __skb_dequeue_tail(list); | |
632 | ||
633 | if (likely(skb != NULL)) | |
25331d6c | 634 | qdisc_qstats_backlog_dec(sch, skb); |
9972b25d TG |
635 | |
636 | return skb; | |
637 | } | |
638 | ||
639 | static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch) | |
640 | { | |
641 | return __qdisc_dequeue_tail(sch, &sch->q); | |
642 | } | |
643 | ||
48a8f519 PM |
644 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
645 | { | |
646 | return skb_peek(&sch->q); | |
647 | } | |
648 | ||
77be155c JP |
649 | /* generic pseudo peek method for non-work-conserving qdisc */ |
650 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
651 | { | |
652 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ | |
61c9eaf9 | 653 | if (!sch->gso_skb) { |
77be155c | 654 | sch->gso_skb = sch->dequeue(sch); |
61c9eaf9 JP |
655 | if (sch->gso_skb) |
656 | /* it's still part of the queue */ | |
657 | sch->q.qlen++; | |
658 | } | |
77be155c JP |
659 | |
660 | return sch->gso_skb; | |
661 | } | |
662 | ||
663 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
664 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
665 | { | |
666 | struct sk_buff *skb = sch->gso_skb; | |
667 | ||
61c9eaf9 | 668 | if (skb) { |
77be155c | 669 | sch->gso_skb = NULL; |
61c9eaf9 JP |
670 | sch->q.qlen--; |
671 | } else { | |
77be155c | 672 | skb = sch->dequeue(sch); |
61c9eaf9 | 673 | } |
77be155c JP |
674 | |
675 | return skb; | |
676 | } | |
677 | ||
9972b25d TG |
678 | static inline void __qdisc_reset_queue(struct Qdisc *sch, |
679 | struct sk_buff_head *list) | |
680 | { | |
681 | /* | |
682 | * We do not know the backlog in bytes of this list, it | |
683 | * is up to the caller to correct it | |
684 | */ | |
93245dd6 | 685 | __skb_queue_purge(list); |
9972b25d TG |
686 | } |
687 | ||
688 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
689 | { | |
690 | __qdisc_reset_queue(sch, &sch->q); | |
691 | sch->qstats.backlog = 0; | |
692 | } | |
693 | ||
694 | static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch, | |
695 | struct sk_buff_head *list) | |
696 | { | |
697 | struct sk_buff *skb = __qdisc_dequeue_tail(sch, list); | |
698 | ||
699 | if (likely(skb != NULL)) { | |
0abf77e5 | 700 | unsigned int len = qdisc_pkt_len(skb); |
9972b25d TG |
701 | kfree_skb(skb); |
702 | return len; | |
703 | } | |
704 | ||
705 | return 0; | |
706 | } | |
707 | ||
708 | static inline unsigned int qdisc_queue_drop(struct Qdisc *sch) | |
709 | { | |
710 | return __qdisc_queue_drop(sch, &sch->q); | |
711 | } | |
712 | ||
713 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) | |
714 | { | |
715 | kfree_skb(skb); | |
25331d6c | 716 | qdisc_qstats_drop(sch); |
9972b25d TG |
717 | |
718 | return NET_XMIT_DROP; | |
719 | } | |
720 | ||
721 | static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch) | |
722 | { | |
25331d6c | 723 | qdisc_qstats_drop(sch); |
9972b25d | 724 | |
c3bc7cff | 725 | #ifdef CONFIG_NET_CLS_ACT |
9972b25d TG |
726 | if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch)) |
727 | goto drop; | |
728 | ||
729 | return NET_XMIT_SUCCESS; | |
730 | ||
731 | drop: | |
732 | #endif | |
733 | kfree_skb(skb); | |
734 | return NET_XMIT_DROP; | |
735 | } | |
736 | ||
e9bef55d JDB |
737 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
738 | long it will take to send a packet given its size. | |
739 | */ | |
740 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
741 | { | |
e08b0998 JDB |
742 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
743 | if (slot < 0) | |
744 | slot = 0; | |
e9bef55d JDB |
745 | slot >>= rtab->rate.cell_log; |
746 | if (slot > 255) | |
a02cec21 | 747 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
748 | return rtab->data[slot]; |
749 | } | |
750 | ||
12da81d1 | 751 | #ifdef CONFIG_NET_CLS_ACT |
210d6de7 CG |
752 | static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask, |
753 | int action) | |
12da81d1 | 754 | { |
210d6de7 CG |
755 | struct sk_buff *n; |
756 | ||
17302107 | 757 | n = skb_clone(skb, gfp_mask); |
12da81d1 JHS |
758 | |
759 | if (n) { | |
760 | n->tc_verd = SET_TC_VERD(n->tc_verd, 0); | |
761 | n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd); | |
762 | n->tc_verd = CLR_TC_MUNGED(n->tc_verd); | |
12da81d1 JHS |
763 | } |
764 | return n; | |
765 | } | |
766 | #endif | |
767 | ||
292f1c7f | 768 | struct psched_ratecfg { |
130d3d68 | 769 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
770 | u32 mult; |
771 | u16 overhead; | |
8a8e3d84 | 772 | u8 linklayer; |
01cb71d2 | 773 | u8 shift; |
292f1c7f JP |
774 | }; |
775 | ||
776 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
777 | unsigned int len) | |
778 | { | |
8a8e3d84 JDB |
779 | len += r->overhead; |
780 | ||
781 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
782 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
783 | ||
784 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
785 | } |
786 | ||
5c15257f | 787 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
788 | const struct tc_ratespec *conf, |
789 | u64 rate64); | |
292f1c7f | 790 | |
01cb71d2 ED |
791 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
792 | const struct psched_ratecfg *r) | |
292f1c7f | 793 | { |
01cb71d2 | 794 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
795 | |
796 | /* legacy struct tc_ratespec has a 32bit @rate field | |
797 | * Qdisc using 64bit rate should add new attributes | |
798 | * in order to maintain compatibility. | |
799 | */ | |
800 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
801 | ||
01cb71d2 | 802 | res->overhead = r->overhead; |
8a8e3d84 | 803 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
804 | } |
805 | ||
1da177e4 | 806 | #endif |