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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 */ |
4eaf3b84 ED |
64 | #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : |
65 | * qdisc_tree_decrease_qlen() should stop. | |
66 | */ | |
45203a3b | 67 | u32 limit; |
05bdd2f1 | 68 | const struct Qdisc_ops *ops; |
a2da570d | 69 | struct qdisc_size_table __rcu *stab; |
5e140dfc | 70 | struct list_head list; |
1da177e4 LT |
71 | u32 handle; |
72 | u32 parent; | |
1da177e4 LT |
73 | int (*reshape_fail)(struct sk_buff *skb, |
74 | struct Qdisc *q); | |
75 | ||
72b25a91 DM |
76 | void *u32_node; |
77 | ||
1da177e4 LT |
78 | /* This field is deprecated, but it is still used by CBQ |
79 | * and it will live until better solution will be invented. | |
80 | */ | |
81 | struct Qdisc *__parent; | |
5e140dfc | 82 | struct netdev_queue *dev_queue; |
5e140dfc | 83 | |
45203a3b | 84 | struct gnet_stats_rate_est64 rate_est; |
0d32ef8c ED |
85 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; |
86 | struct gnet_stats_queue __percpu *cpu_qstats; | |
87 | ||
45203a3b | 88 | struct Qdisc *next_sched; |
5e140dfc ED |
89 | struct sk_buff *gso_skb; |
90 | /* | |
91 | * For performance sake on SMP, we put highly modified fields at the end | |
92 | */ | |
93 | unsigned long state; | |
94 | struct sk_buff_head q; | |
0d32ef8c | 95 | struct gnet_stats_basic_packed bstats; |
fd245a4a | 96 | unsigned int __state; |
0d32ef8c | 97 | struct gnet_stats_queue qstats; |
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); |
92c075db | 171 | bool (*tcf_cl_offload)(u32 classid); |
1da177e4 LT |
172 | unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, |
173 | u32 classid); | |
174 | void (*unbind_tcf)(struct Qdisc *, unsigned long); | |
175 | ||
176 | /* rtnetlink specific */ | |
177 | int (*dump)(struct Qdisc *, unsigned long, | |
178 | struct sk_buff *skb, struct tcmsg*); | |
179 | int (*dump_stats)(struct Qdisc *, unsigned long, | |
180 | struct gnet_dump *); | |
181 | }; | |
182 | ||
fd2c3ef7 | 183 | struct Qdisc_ops { |
1da177e4 | 184 | struct Qdisc_ops *next; |
20fea08b | 185 | const struct Qdisc_class_ops *cl_ops; |
1da177e4 LT |
186 | char id[IFNAMSIZ]; |
187 | int priv_size; | |
188 | ||
189 | int (*enqueue)(struct sk_buff *, struct Qdisc *); | |
190 | struct sk_buff * (*dequeue)(struct Qdisc *); | |
90d841fd | 191 | struct sk_buff * (*peek)(struct Qdisc *); |
1da177e4 LT |
192 | unsigned int (*drop)(struct Qdisc *); |
193 | ||
1e90474c | 194 | int (*init)(struct Qdisc *, struct nlattr *arg); |
1da177e4 LT |
195 | void (*reset)(struct Qdisc *); |
196 | void (*destroy)(struct Qdisc *); | |
1e90474c | 197 | int (*change)(struct Qdisc *, struct nlattr *arg); |
6ec1c69a | 198 | void (*attach)(struct Qdisc *); |
1da177e4 LT |
199 | |
200 | int (*dump)(struct Qdisc *, struct sk_buff *); | |
201 | int (*dump_stats)(struct Qdisc *, struct gnet_dump *); | |
202 | ||
203 | struct module *owner; | |
204 | }; | |
205 | ||
206 | ||
fd2c3ef7 | 207 | struct tcf_result { |
1da177e4 LT |
208 | unsigned long class; |
209 | u32 classid; | |
210 | }; | |
211 | ||
fd2c3ef7 | 212 | struct tcf_proto_ops { |
36272874 | 213 | struct list_head head; |
1da177e4 LT |
214 | char kind[IFNAMSIZ]; |
215 | ||
dc7f9f6e ED |
216 | int (*classify)(struct sk_buff *, |
217 | const struct tcf_proto *, | |
218 | struct tcf_result *); | |
1da177e4 | 219 | int (*init)(struct tcf_proto*); |
1e052be6 | 220 | bool (*destroy)(struct tcf_proto*, bool); |
1da177e4 LT |
221 | |
222 | unsigned long (*get)(struct tcf_proto*, u32 handle); | |
c1b52739 | 223 | int (*change)(struct net *net, struct sk_buff *, |
af4c6641 | 224 | struct tcf_proto*, unsigned long, |
add93b61 | 225 | u32 handle, struct nlattr **, |
2f7ef2f8 | 226 | unsigned long *, bool); |
1da177e4 LT |
227 | int (*delete)(struct tcf_proto*, unsigned long); |
228 | void (*walk)(struct tcf_proto*, struct tcf_walker *arg); | |
229 | ||
230 | /* rtnetlink specific */ | |
832d1d5b | 231 | int (*dump)(struct net*, struct tcf_proto*, unsigned long, |
1da177e4 LT |
232 | struct sk_buff *skb, struct tcmsg*); |
233 | ||
234 | struct module *owner; | |
235 | }; | |
236 | ||
fd2c3ef7 | 237 | struct tcf_proto { |
1da177e4 | 238 | /* Fast access part */ |
25d8c0d5 JF |
239 | struct tcf_proto __rcu *next; |
240 | void __rcu *root; | |
dc7f9f6e ED |
241 | int (*classify)(struct sk_buff *, |
242 | const struct tcf_proto *, | |
243 | struct tcf_result *); | |
66c6f529 | 244 | __be16 protocol; |
1da177e4 LT |
245 | |
246 | /* All the rest */ | |
247 | u32 prio; | |
248 | u32 classid; | |
249 | struct Qdisc *q; | |
250 | void *data; | |
dc7f9f6e | 251 | const struct tcf_proto_ops *ops; |
25d8c0d5 | 252 | struct rcu_head rcu; |
1da177e4 LT |
253 | }; |
254 | ||
175f9c1b JK |
255 | struct qdisc_skb_cb { |
256 | unsigned int pkt_len; | |
df4ab5b3 | 257 | u16 slave_dev_queue_mapping; |
045efa82 | 258 | u16 tc_classid; |
25711786 ED |
259 | #define QDISC_CB_PRIV_LEN 20 |
260 | unsigned char data[QDISC_CB_PRIV_LEN]; | |
175f9c1b JK |
261 | }; |
262 | ||
16bda13d DM |
263 | static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
264 | { | |
265 | struct qdisc_skb_cb *qcb; | |
5ee31c68 ED |
266 | |
267 | BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); | |
16bda13d DM |
268 | BUILD_BUG_ON(sizeof(qcb->data) < sz); |
269 | } | |
270 | ||
05bdd2f1 | 271 | static inline int qdisc_qlen(const struct Qdisc *q) |
bbd8a0d3 KK |
272 | { |
273 | return q->q.qlen; | |
274 | } | |
275 | ||
bfe0d029 | 276 | static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
175f9c1b JK |
277 | { |
278 | return (struct qdisc_skb_cb *)skb->cb; | |
279 | } | |
280 | ||
83874000 DM |
281 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
282 | { | |
283 | return &qdisc->q.lock; | |
284 | } | |
285 | ||
05bdd2f1 | 286 | static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
7698b4fc | 287 | { |
46e5da40 JF |
288 | struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
289 | ||
290 | return q; | |
7698b4fc DM |
291 | } |
292 | ||
05bdd2f1 | 293 | static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
2540e051 JP |
294 | { |
295 | return qdisc->dev_queue->qdisc_sleeping; | |
296 | } | |
297 | ||
7e43f112 DM |
298 | /* The qdisc root lock is a mechanism by which to top level |
299 | * of a qdisc tree can be locked from any qdisc node in the | |
300 | * forest. This allows changing the configuration of some | |
301 | * aspect of the qdisc tree while blocking out asynchronous | |
302 | * qdisc access in the packet processing paths. | |
303 | * | |
304 | * It is only legal to do this when the root will not change | |
305 | * on us. Otherwise we'll potentially lock the wrong qdisc | |
306 | * root. This is enforced by holding the RTNL semaphore, which | |
307 | * all users of this lock accessor must do. | |
308 | */ | |
05bdd2f1 | 309 | static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) |
7698b4fc DM |
310 | { |
311 | struct Qdisc *root = qdisc_root(qdisc); | |
312 | ||
7e43f112 | 313 | ASSERT_RTNL(); |
83874000 | 314 | return qdisc_lock(root); |
7698b4fc DM |
315 | } |
316 | ||
05bdd2f1 | 317 | static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
f6f9b93f JP |
318 | { |
319 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
320 | ||
321 | ASSERT_RTNL(); | |
322 | return qdisc_lock(root); | |
323 | } | |
324 | ||
05bdd2f1 | 325 | static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) |
5ce2d488 DM |
326 | { |
327 | return qdisc->dev_queue->dev; | |
328 | } | |
1da177e4 | 329 | |
05bdd2f1 | 330 | static inline void sch_tree_lock(const struct Qdisc *q) |
78a5b30b | 331 | { |
fe439dd0 | 332 | spin_lock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
333 | } |
334 | ||
05bdd2f1 | 335 | static inline void sch_tree_unlock(const struct Qdisc *q) |
78a5b30b | 336 | { |
fe439dd0 | 337 | spin_unlock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
338 | } |
339 | ||
340 | #define tcf_tree_lock(tp) sch_tree_lock((tp)->q) | |
341 | #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q) | |
1da177e4 | 342 | |
e41a33e6 TG |
343 | extern struct Qdisc noop_qdisc; |
344 | extern struct Qdisc_ops noop_qdisc_ops; | |
6ec1c69a DM |
345 | extern struct Qdisc_ops pfifo_fast_ops; |
346 | extern struct Qdisc_ops mq_qdisc_ops; | |
d66d6c31 | 347 | extern struct Qdisc_ops noqueue_qdisc_ops; |
6da7c8fc | 348 | extern const struct Qdisc_ops *default_qdisc_ops; |
1f27cde3 ED |
349 | static inline const struct Qdisc_ops * |
350 | get_default_qdisc_ops(const struct net_device *dev, int ntx) | |
351 | { | |
352 | return ntx < dev->real_num_tx_queues ? | |
353 | default_qdisc_ops : &pfifo_fast_ops; | |
354 | } | |
e41a33e6 | 355 | |
fd2c3ef7 | 356 | struct Qdisc_class_common { |
6fe1c7a5 PM |
357 | u32 classid; |
358 | struct hlist_node hnode; | |
359 | }; | |
360 | ||
fd2c3ef7 | 361 | struct Qdisc_class_hash { |
6fe1c7a5 PM |
362 | struct hlist_head *hash; |
363 | unsigned int hashsize; | |
364 | unsigned int hashmask; | |
365 | unsigned int hashelems; | |
366 | }; | |
367 | ||
368 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
369 | { | |
370 | id ^= id >> 8; | |
371 | id ^= id >> 4; | |
372 | return id & mask; | |
373 | } | |
374 | ||
375 | static inline struct Qdisc_class_common * | |
05bdd2f1 | 376 | qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
6fe1c7a5 PM |
377 | { |
378 | struct Qdisc_class_common *cl; | |
6fe1c7a5 PM |
379 | unsigned int h; |
380 | ||
381 | h = qdisc_class_hash(id, hash->hashmask); | |
b67bfe0d | 382 | hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
6fe1c7a5 PM |
383 | if (cl->classid == id) |
384 | return cl; | |
385 | } | |
386 | return NULL; | |
387 | } | |
388 | ||
5c15257f JP |
389 | int qdisc_class_hash_init(struct Qdisc_class_hash *); |
390 | void qdisc_class_hash_insert(struct Qdisc_class_hash *, | |
391 | struct Qdisc_class_common *); | |
392 | void qdisc_class_hash_remove(struct Qdisc_class_hash *, | |
393 | struct Qdisc_class_common *); | |
394 | void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
395 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
396 | ||
397 | void dev_init_scheduler(struct net_device *dev); | |
398 | void dev_shutdown(struct net_device *dev); | |
399 | void dev_activate(struct net_device *dev); | |
400 | void dev_deactivate(struct net_device *dev); | |
401 | void dev_deactivate_many(struct list_head *head); | |
402 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
403 | struct Qdisc *qdisc); | |
404 | void qdisc_reset(struct Qdisc *qdisc); | |
405 | void qdisc_destroy(struct Qdisc *qdisc); | |
2ccccf5f WC |
406 | void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n, |
407 | unsigned int len); | |
5c15257f | 408 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d2a7f269 | 409 | const struct Qdisc_ops *ops); |
5c15257f | 410 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 411 | const struct Qdisc_ops *ops, u32 parentid); |
5c15257f JP |
412 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
413 | const struct qdisc_size_table *stab); | |
1e052be6 | 414 | bool tcf_destroy(struct tcf_proto *tp, bool force); |
25d8c0d5 | 415 | void tcf_destroy_chain(struct tcf_proto __rcu **fl); |
27b29f63 | 416 | int skb_do_redirect(struct sk_buff *); |
1da177e4 | 417 | |
fdc5432a DB |
418 | static inline bool skb_at_tc_ingress(const struct sk_buff *skb) |
419 | { | |
420 | #ifdef CONFIG_NET_CLS_ACT | |
421 | return G_TC_AT(skb->tc_verd) & AT_INGRESS; | |
422 | #else | |
423 | return false; | |
424 | #endif | |
425 | } | |
426 | ||
f0796d5c JF |
427 | /* Reset all TX qdiscs greater then index of a device. */ |
428 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) | |
5aa70995 | 429 | { |
4ef6acff JF |
430 | struct Qdisc *qdisc; |
431 | ||
f0796d5c | 432 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 433 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
434 | if (qdisc) { |
435 | spin_lock_bh(qdisc_lock(qdisc)); | |
436 | qdisc_reset(qdisc); | |
437 | spin_unlock_bh(qdisc_lock(qdisc)); | |
438 | } | |
439 | } | |
5aa70995 DM |
440 | } |
441 | ||
5aa70995 DM |
442 | static inline void qdisc_reset_all_tx(struct net_device *dev) |
443 | { | |
f0796d5c | 444 | qdisc_reset_all_tx_gt(dev, 0); |
5aa70995 DM |
445 | } |
446 | ||
3e745dd6 DM |
447 | /* Are all TX queues of the device empty? */ |
448 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
449 | { | |
e8a0464c | 450 | unsigned int i; |
46e5da40 JF |
451 | |
452 | rcu_read_lock(); | |
e8a0464c DM |
453 | for (i = 0; i < dev->num_tx_queues; i++) { |
454 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 455 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 456 | |
46e5da40 JF |
457 | if (q->q.qlen) { |
458 | rcu_read_unlock(); | |
e8a0464c | 459 | return false; |
46e5da40 | 460 | } |
e8a0464c | 461 | } |
46e5da40 | 462 | rcu_read_unlock(); |
e8a0464c | 463 | return true; |
3e745dd6 DM |
464 | } |
465 | ||
6fa9864b | 466 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 467 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 468 | { |
e8a0464c | 469 | unsigned int i; |
46e5da40 | 470 | |
e8a0464c DM |
471 | for (i = 0; i < dev->num_tx_queues; i++) { |
472 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 473 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
474 | return true; |
475 | } | |
476 | return false; | |
6fa9864b DM |
477 | } |
478 | ||
e8a0464c | 479 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
480 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
481 | { | |
e8a0464c | 482 | unsigned int i; |
46e5da40 | 483 | |
e8a0464c DM |
484 | for (i = 0; i < dev->num_tx_queues; i++) { |
485 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 486 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
e8a0464c DM |
487 | return false; |
488 | } | |
489 | return true; | |
05297949 DM |
490 | } |
491 | ||
bfe0d029 | 492 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 493 | { |
175f9c1b | 494 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
495 | } |
496 | ||
c27f339a | 497 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
498 | enum net_xmit_qdisc_t { |
499 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 500 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
501 | }; |
502 | ||
c27f339a | 503 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 504 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
505 | #else |
506 | #define net_xmit_drop_count(e) (1) | |
507 | #endif | |
508 | ||
a2da570d ED |
509 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
510 | const struct Qdisc *sch) | |
5f86173b | 511 | { |
3a682fbd | 512 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
513 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
514 | ||
515 | if (stab) | |
516 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 517 | #endif |
a2da570d ED |
518 | } |
519 | ||
520 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch) | |
521 | { | |
522 | qdisc_calculate_pkt_len(skb, sch); | |
5f86173b JK |
523 | return sch->enqueue(skb, sch); |
524 | } | |
525 | ||
22e0f8b9 JF |
526 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
527 | { | |
528 | return q->flags & TCQ_F_CPUSTATS; | |
529 | } | |
bfe0d029 | 530 | |
38040702 AV |
531 | static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, |
532 | __u64 bytes, __u32 packets) | |
533 | { | |
534 | bstats->bytes += bytes; | |
535 | bstats->packets += packets; | |
536 | } | |
537 | ||
bfe0d029 ED |
538 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, |
539 | const struct sk_buff *skb) | |
540 | { | |
38040702 AV |
541 | _bstats_update(bstats, |
542 | qdisc_pkt_len(skb), | |
543 | skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); | |
544 | } | |
545 | ||
546 | static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, | |
547 | __u64 bytes, __u32 packets) | |
548 | { | |
549 | u64_stats_update_begin(&bstats->syncp); | |
550 | _bstats_update(&bstats->bstats, bytes, packets); | |
551 | u64_stats_update_end(&bstats->syncp); | |
bfe0d029 ED |
552 | } |
553 | ||
24ea591d ED |
554 | static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, |
555 | const struct sk_buff *skb) | |
22e0f8b9 | 556 | { |
22e0f8b9 JF |
557 | u64_stats_update_begin(&bstats->syncp); |
558 | bstats_update(&bstats->bstats, skb); | |
559 | u64_stats_update_end(&bstats->syncp); | |
560 | } | |
561 | ||
24ea591d ED |
562 | static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
563 | const struct sk_buff *skb) | |
564 | { | |
565 | bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); | |
566 | } | |
567 | ||
bfe0d029 ED |
568 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
569 | const struct sk_buff *skb) | |
bbd8a0d3 | 570 | { |
bfe0d029 | 571 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
572 | } |
573 | ||
25331d6c JF |
574 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
575 | const struct sk_buff *skb) | |
576 | { | |
577 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
578 | } | |
579 | ||
580 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, | |
581 | const struct sk_buff *skb) | |
582 | { | |
583 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
584 | } | |
585 | ||
586 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) | |
587 | { | |
588 | sch->qstats.drops += count; | |
589 | } | |
590 | ||
24ea591d | 591 | static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
25331d6c | 592 | { |
24ea591d | 593 | qstats->drops++; |
25331d6c JF |
594 | } |
595 | ||
24ea591d | 596 | static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
b0ab6f92 | 597 | { |
24ea591d ED |
598 | qstats->overlimits++; |
599 | } | |
b0ab6f92 | 600 | |
24ea591d ED |
601 | static inline void qdisc_qstats_drop(struct Qdisc *sch) |
602 | { | |
603 | qstats_drop_inc(&sch->qstats); | |
604 | } | |
605 | ||
606 | static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) | |
607 | { | |
608 | qstats_drop_inc(this_cpu_ptr(sch->cpu_qstats)); | |
b0ab6f92 JF |
609 | } |
610 | ||
25331d6c JF |
611 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
612 | { | |
613 | sch->qstats.overlimits++; | |
614 | } | |
615 | ||
9972b25d TG |
616 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
617 | struct sk_buff_head *list) | |
618 | { | |
619 | __skb_queue_tail(list, skb); | |
25331d6c | 620 | qdisc_qstats_backlog_inc(sch, skb); |
9972b25d TG |
621 | |
622 | return NET_XMIT_SUCCESS; | |
623 | } | |
624 | ||
625 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
626 | { | |
627 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
628 | } | |
629 | ||
630 | static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch, | |
631 | struct sk_buff_head *list) | |
632 | { | |
633 | struct sk_buff *skb = __skb_dequeue(list); | |
634 | ||
9190b3b3 | 635 | if (likely(skb != NULL)) { |
25331d6c | 636 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
637 | qdisc_bstats_update(sch, skb); |
638 | } | |
9972b25d TG |
639 | |
640 | return skb; | |
641 | } | |
642 | ||
643 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
644 | { | |
645 | return __qdisc_dequeue_head(sch, &sch->q); | |
57dbb2d8 HPP |
646 | } |
647 | ||
648 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, | |
649 | struct sk_buff_head *list) | |
650 | { | |
9190b3b3 | 651 | struct sk_buff *skb = __skb_dequeue(list); |
57dbb2d8 HPP |
652 | |
653 | if (likely(skb != NULL)) { | |
654 | unsigned int len = qdisc_pkt_len(skb); | |
25331d6c | 655 | qdisc_qstats_backlog_dec(sch, skb); |
57dbb2d8 HPP |
656 | kfree_skb(skb); |
657 | return len; | |
658 | } | |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
663 | static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch) | |
664 | { | |
665 | return __qdisc_queue_drop_head(sch, &sch->q); | |
9972b25d TG |
666 | } |
667 | ||
668 | static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch, | |
669 | struct sk_buff_head *list) | |
670 | { | |
671 | struct sk_buff *skb = __skb_dequeue_tail(list); | |
672 | ||
673 | if (likely(skb != NULL)) | |
25331d6c | 674 | qdisc_qstats_backlog_dec(sch, skb); |
9972b25d TG |
675 | |
676 | return skb; | |
677 | } | |
678 | ||
679 | static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch) | |
680 | { | |
681 | return __qdisc_dequeue_tail(sch, &sch->q); | |
682 | } | |
683 | ||
48a8f519 PM |
684 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
685 | { | |
686 | return skb_peek(&sch->q); | |
687 | } | |
688 | ||
77be155c JP |
689 | /* generic pseudo peek method for non-work-conserving qdisc */ |
690 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
691 | { | |
692 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ | |
61c9eaf9 | 693 | if (!sch->gso_skb) { |
77be155c | 694 | sch->gso_skb = sch->dequeue(sch); |
a27758ff | 695 | if (sch->gso_skb) { |
61c9eaf9 | 696 | /* it's still part of the queue */ |
a27758ff | 697 | qdisc_qstats_backlog_inc(sch, sch->gso_skb); |
61c9eaf9 | 698 | sch->q.qlen++; |
a27758ff | 699 | } |
61c9eaf9 | 700 | } |
77be155c JP |
701 | |
702 | return sch->gso_skb; | |
703 | } | |
704 | ||
705 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
706 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
707 | { | |
708 | struct sk_buff *skb = sch->gso_skb; | |
709 | ||
61c9eaf9 | 710 | if (skb) { |
77be155c | 711 | sch->gso_skb = NULL; |
a27758ff | 712 | qdisc_qstats_backlog_dec(sch, skb); |
61c9eaf9 JP |
713 | sch->q.qlen--; |
714 | } else { | |
77be155c | 715 | skb = sch->dequeue(sch); |
61c9eaf9 | 716 | } |
77be155c JP |
717 | |
718 | return skb; | |
719 | } | |
720 | ||
9972b25d TG |
721 | static inline void __qdisc_reset_queue(struct Qdisc *sch, |
722 | struct sk_buff_head *list) | |
723 | { | |
724 | /* | |
725 | * We do not know the backlog in bytes of this list, it | |
726 | * is up to the caller to correct it | |
727 | */ | |
93245dd6 | 728 | __skb_queue_purge(list); |
9972b25d TG |
729 | } |
730 | ||
731 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
732 | { | |
733 | __qdisc_reset_queue(sch, &sch->q); | |
734 | sch->qstats.backlog = 0; | |
735 | } | |
736 | ||
86a7996c WC |
737 | static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, |
738 | struct Qdisc **pold) | |
739 | { | |
740 | struct Qdisc *old; | |
741 | ||
742 | sch_tree_lock(sch); | |
743 | old = *pold; | |
744 | *pold = new; | |
745 | if (old != NULL) { | |
2ccccf5f | 746 | qdisc_tree_reduce_backlog(old, old->q.qlen, old->qstats.backlog); |
86a7996c WC |
747 | qdisc_reset(old); |
748 | } | |
749 | sch_tree_unlock(sch); | |
750 | ||
751 | return old; | |
752 | } | |
753 | ||
9972b25d TG |
754 | static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch, |
755 | struct sk_buff_head *list) | |
756 | { | |
757 | struct sk_buff *skb = __qdisc_dequeue_tail(sch, list); | |
758 | ||
759 | if (likely(skb != NULL)) { | |
0abf77e5 | 760 | unsigned int len = qdisc_pkt_len(skb); |
9972b25d TG |
761 | kfree_skb(skb); |
762 | return len; | |
763 | } | |
764 | ||
765 | return 0; | |
766 | } | |
767 | ||
768 | static inline unsigned int qdisc_queue_drop(struct Qdisc *sch) | |
769 | { | |
770 | return __qdisc_queue_drop(sch, &sch->q); | |
771 | } | |
772 | ||
773 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) | |
774 | { | |
775 | kfree_skb(skb); | |
25331d6c | 776 | qdisc_qstats_drop(sch); |
9972b25d TG |
777 | |
778 | return NET_XMIT_DROP; | |
779 | } | |
780 | ||
781 | static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch) | |
782 | { | |
25331d6c | 783 | qdisc_qstats_drop(sch); |
9972b25d | 784 | |
c3bc7cff | 785 | #ifdef CONFIG_NET_CLS_ACT |
9972b25d TG |
786 | if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch)) |
787 | goto drop; | |
788 | ||
789 | return NET_XMIT_SUCCESS; | |
790 | ||
791 | drop: | |
792 | #endif | |
793 | kfree_skb(skb); | |
794 | return NET_XMIT_DROP; | |
795 | } | |
796 | ||
e9bef55d JDB |
797 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
798 | long it will take to send a packet given its size. | |
799 | */ | |
800 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
801 | { | |
e08b0998 JDB |
802 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
803 | if (slot < 0) | |
804 | slot = 0; | |
e9bef55d JDB |
805 | slot >>= rtab->rate.cell_log; |
806 | if (slot > 255) | |
a02cec21 | 807 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
808 | return rtab->data[slot]; |
809 | } | |
810 | ||
292f1c7f | 811 | struct psched_ratecfg { |
130d3d68 | 812 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
813 | u32 mult; |
814 | u16 overhead; | |
8a8e3d84 | 815 | u8 linklayer; |
01cb71d2 | 816 | u8 shift; |
292f1c7f JP |
817 | }; |
818 | ||
819 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
820 | unsigned int len) | |
821 | { | |
8a8e3d84 JDB |
822 | len += r->overhead; |
823 | ||
824 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
825 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
826 | ||
827 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
828 | } |
829 | ||
5c15257f | 830 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
831 | const struct tc_ratespec *conf, |
832 | u64 rate64); | |
292f1c7f | 833 | |
01cb71d2 ED |
834 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
835 | const struct psched_ratecfg *r) | |
292f1c7f | 836 | { |
01cb71d2 | 837 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
838 | |
839 | /* legacy struct tc_ratespec has a 32bit @rate field | |
840 | * Qdisc using 64bit rate should add new attributes | |
841 | * in order to maintain compatibility. | |
842 | */ | |
843 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
844 | ||
01cb71d2 | 845 | res->overhead = r->overhead; |
8a8e3d84 | 846 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
847 | } |
848 | ||
1da177e4 | 849 | #endif |