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 | */ | |
49b49971 | 69 | #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ |
45203a3b | 70 | u32 limit; |
05bdd2f1 | 71 | const struct Qdisc_ops *ops; |
a2da570d | 72 | struct qdisc_size_table __rcu *stab; |
59cc1f61 | 73 | struct hlist_node hash; |
1da177e4 LT |
74 | u32 handle; |
75 | u32 parent; | |
72b25a91 DM |
76 | void *u32_node; |
77 | ||
5e140dfc | 78 | struct netdev_queue *dev_queue; |
5e140dfc | 79 | |
1c0d32fd | 80 | struct net_rate_estimator __rcu *rate_est; |
0d32ef8c ED |
81 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; |
82 | struct gnet_stats_queue __percpu *cpu_qstats; | |
83 | ||
5e140dfc ED |
84 | /* |
85 | * For performance sake on SMP, we put highly modified fields at the end | |
86 | */ | |
4d202a0d | 87 | struct sk_buff *gso_skb ____cacheline_aligned_in_smp; |
48da34b7 | 88 | struct qdisc_skb_head q; |
0d32ef8c | 89 | struct gnet_stats_basic_packed bstats; |
f9eb8aea | 90 | seqcount_t running; |
0d32ef8c | 91 | struct gnet_stats_queue qstats; |
4d202a0d ED |
92 | unsigned long state; |
93 | struct Qdisc *next_sched; | |
94 | struct sk_buff *skb_bad_txq; | |
79640a4c | 95 | struct rcu_head rcu_head; |
45203a3b ED |
96 | int padded; |
97 | atomic_t refcnt; | |
98 | ||
99 | spinlock_t busylock ____cacheline_aligned_in_smp; | |
1da177e4 LT |
100 | }; |
101 | ||
fd245a4a | 102 | static inline bool qdisc_is_running(const struct Qdisc *qdisc) |
bc135b23 | 103 | { |
f9eb8aea | 104 | return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; |
bc135b23 ED |
105 | } |
106 | ||
107 | static inline bool qdisc_run_begin(struct Qdisc *qdisc) | |
108 | { | |
fd245a4a ED |
109 | if (qdisc_is_running(qdisc)) |
110 | return false; | |
52fbb290 ED |
111 | /* Variant of write_seqcount_begin() telling lockdep a trylock |
112 | * was attempted. | |
113 | */ | |
114 | raw_write_seqcount_begin(&qdisc->running); | |
115 | seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_); | |
fd245a4a | 116 | return true; |
bc135b23 ED |
117 | } |
118 | ||
119 | static inline void qdisc_run_end(struct Qdisc *qdisc) | |
120 | { | |
f9eb8aea | 121 | write_seqcount_end(&qdisc->running); |
fd245a4a ED |
122 | } |
123 | ||
5772e9a3 JDB |
124 | static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) |
125 | { | |
126 | return qdisc->flags & TCQ_F_ONETXQUEUE; | |
127 | } | |
128 | ||
129 | static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) | |
130 | { | |
131 | #ifdef CONFIG_BQL | |
132 | /* Non-BQL migrated drivers will return 0, too. */ | |
133 | return dql_avail(&txq->dql); | |
134 | #else | |
135 | return 0; | |
136 | #endif | |
137 | } | |
138 | ||
fd2c3ef7 | 139 | struct Qdisc_class_ops { |
1da177e4 | 140 | /* Child qdisc manipulation */ |
926e61b7 | 141 | struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); |
1da177e4 LT |
142 | int (*graft)(struct Qdisc *, unsigned long cl, |
143 | struct Qdisc *, struct Qdisc **); | |
144 | struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); | |
43effa1e | 145 | void (*qlen_notify)(struct Qdisc *, unsigned long); |
1da177e4 LT |
146 | |
147 | /* Class manipulation routines */ | |
148 | unsigned long (*get)(struct Qdisc *, u32 classid); | |
149 | void (*put)(struct Qdisc *, unsigned long); | |
150 | int (*change)(struct Qdisc *, u32, u32, | |
1e90474c | 151 | struct nlattr **, unsigned long *); |
1da177e4 LT |
152 | int (*delete)(struct Qdisc *, unsigned long); |
153 | void (*walk)(struct Qdisc *, struct qdisc_walker * arg); | |
154 | ||
155 | /* Filter manipulation */ | |
6529eaba | 156 | struct tcf_block * (*tcf_block)(struct Qdisc *, unsigned long); |
92c075db | 157 | bool (*tcf_cl_offload)(u32 classid); |
1da177e4 LT |
158 | unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, |
159 | u32 classid); | |
160 | void (*unbind_tcf)(struct Qdisc *, unsigned long); | |
161 | ||
162 | /* rtnetlink specific */ | |
163 | int (*dump)(struct Qdisc *, unsigned long, | |
164 | struct sk_buff *skb, struct tcmsg*); | |
165 | int (*dump_stats)(struct Qdisc *, unsigned long, | |
166 | struct gnet_dump *); | |
167 | }; | |
168 | ||
fd2c3ef7 | 169 | struct Qdisc_ops { |
1da177e4 | 170 | struct Qdisc_ops *next; |
20fea08b | 171 | const struct Qdisc_class_ops *cl_ops; |
1da177e4 LT |
172 | char id[IFNAMSIZ]; |
173 | int priv_size; | |
174 | ||
520ac30f ED |
175 | int (*enqueue)(struct sk_buff *skb, |
176 | struct Qdisc *sch, | |
177 | struct sk_buff **to_free); | |
1da177e4 | 178 | struct sk_buff * (*dequeue)(struct Qdisc *); |
90d841fd | 179 | struct sk_buff * (*peek)(struct Qdisc *); |
1da177e4 | 180 | |
1e90474c | 181 | int (*init)(struct Qdisc *, struct nlattr *arg); |
1da177e4 LT |
182 | void (*reset)(struct Qdisc *); |
183 | void (*destroy)(struct Qdisc *); | |
1e90474c | 184 | int (*change)(struct Qdisc *, struct nlattr *arg); |
6ec1c69a | 185 | void (*attach)(struct Qdisc *); |
1da177e4 LT |
186 | |
187 | int (*dump)(struct Qdisc *, struct sk_buff *); | |
188 | int (*dump_stats)(struct Qdisc *, struct gnet_dump *); | |
189 | ||
190 | struct module *owner; | |
191 | }; | |
192 | ||
193 | ||
fd2c3ef7 | 194 | struct tcf_result { |
1da177e4 LT |
195 | unsigned long class; |
196 | u32 classid; | |
197 | }; | |
198 | ||
fd2c3ef7 | 199 | struct tcf_proto_ops { |
36272874 | 200 | struct list_head head; |
1da177e4 LT |
201 | char kind[IFNAMSIZ]; |
202 | ||
dc7f9f6e ED |
203 | int (*classify)(struct sk_buff *, |
204 | const struct tcf_proto *, | |
205 | struct tcf_result *); | |
1da177e4 | 206 | int (*init)(struct tcf_proto*); |
763dbf63 | 207 | void (*destroy)(struct tcf_proto*); |
1da177e4 LT |
208 | |
209 | unsigned long (*get)(struct tcf_proto*, u32 handle); | |
c1b52739 | 210 | int (*change)(struct net *net, struct sk_buff *, |
af4c6641 | 211 | struct tcf_proto*, unsigned long, |
add93b61 | 212 | u32 handle, struct nlattr **, |
2f7ef2f8 | 213 | unsigned long *, bool); |
763dbf63 | 214 | int (*delete)(struct tcf_proto*, unsigned long, bool*); |
1da177e4 LT |
215 | void (*walk)(struct tcf_proto*, struct tcf_walker *arg); |
216 | ||
217 | /* rtnetlink specific */ | |
832d1d5b | 218 | int (*dump)(struct net*, struct tcf_proto*, unsigned long, |
1da177e4 LT |
219 | struct sk_buff *skb, struct tcmsg*); |
220 | ||
221 | struct module *owner; | |
222 | }; | |
223 | ||
fd2c3ef7 | 224 | struct tcf_proto { |
1da177e4 | 225 | /* Fast access part */ |
25d8c0d5 JF |
226 | struct tcf_proto __rcu *next; |
227 | void __rcu *root; | |
dc7f9f6e ED |
228 | int (*classify)(struct sk_buff *, |
229 | const struct tcf_proto *, | |
230 | struct tcf_result *); | |
66c6f529 | 231 | __be16 protocol; |
1da177e4 LT |
232 | |
233 | /* All the rest */ | |
234 | u32 prio; | |
235 | u32 classid; | |
236 | struct Qdisc *q; | |
237 | void *data; | |
dc7f9f6e | 238 | const struct tcf_proto_ops *ops; |
6529eaba | 239 | struct tcf_block *block; |
25d8c0d5 | 240 | struct rcu_head rcu; |
1da177e4 LT |
241 | }; |
242 | ||
175f9c1b JK |
243 | struct qdisc_skb_cb { |
244 | unsigned int pkt_len; | |
df4ab5b3 | 245 | u16 slave_dev_queue_mapping; |
045efa82 | 246 | u16 tc_classid; |
25711786 ED |
247 | #define QDISC_CB_PRIV_LEN 20 |
248 | unsigned char data[QDISC_CB_PRIV_LEN]; | |
175f9c1b JK |
249 | }; |
250 | ||
6529eaba JP |
251 | struct tcf_block { |
252 | struct tcf_proto __rcu **p_filter_chain; | |
253 | }; | |
254 | ||
16bda13d DM |
255 | static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
256 | { | |
257 | struct qdisc_skb_cb *qcb; | |
5ee31c68 ED |
258 | |
259 | BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); | |
16bda13d DM |
260 | BUILD_BUG_ON(sizeof(qcb->data) < sz); |
261 | } | |
262 | ||
05bdd2f1 | 263 | static inline int qdisc_qlen(const struct Qdisc *q) |
bbd8a0d3 KK |
264 | { |
265 | return q->q.qlen; | |
266 | } | |
267 | ||
bfe0d029 | 268 | static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
175f9c1b JK |
269 | { |
270 | return (struct qdisc_skb_cb *)skb->cb; | |
271 | } | |
272 | ||
83874000 DM |
273 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
274 | { | |
275 | return &qdisc->q.lock; | |
276 | } | |
277 | ||
05bdd2f1 | 278 | static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
7698b4fc | 279 | { |
46e5da40 JF |
280 | struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
281 | ||
282 | return q; | |
7698b4fc DM |
283 | } |
284 | ||
05bdd2f1 | 285 | static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
2540e051 JP |
286 | { |
287 | return qdisc->dev_queue->qdisc_sleeping; | |
288 | } | |
289 | ||
7e43f112 DM |
290 | /* The qdisc root lock is a mechanism by which to top level |
291 | * of a qdisc tree can be locked from any qdisc node in the | |
292 | * forest. This allows changing the configuration of some | |
293 | * aspect of the qdisc tree while blocking out asynchronous | |
294 | * qdisc access in the packet processing paths. | |
295 | * | |
296 | * It is only legal to do this when the root will not change | |
297 | * on us. Otherwise we'll potentially lock the wrong qdisc | |
298 | * root. This is enforced by holding the RTNL semaphore, which | |
299 | * all users of this lock accessor must do. | |
300 | */ | |
05bdd2f1 | 301 | static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) |
7698b4fc DM |
302 | { |
303 | struct Qdisc *root = qdisc_root(qdisc); | |
304 | ||
7e43f112 | 305 | ASSERT_RTNL(); |
83874000 | 306 | return qdisc_lock(root); |
7698b4fc DM |
307 | } |
308 | ||
05bdd2f1 | 309 | static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
f6f9b93f JP |
310 | { |
311 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
312 | ||
313 | ASSERT_RTNL(); | |
314 | return qdisc_lock(root); | |
315 | } | |
316 | ||
edb09eb1 ED |
317 | static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) |
318 | { | |
319 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
320 | ||
321 | ASSERT_RTNL(); | |
322 | return &root->running; | |
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); | |
27b29f63 | 414 | int skb_do_redirect(struct sk_buff *); |
1da177e4 | 415 | |
a5135bcf WB |
416 | static inline void skb_reset_tc(struct sk_buff *skb) |
417 | { | |
418 | #ifdef CONFIG_NET_CLS_ACT | |
bc31c905 | 419 | skb->tc_redirected = 0; |
a5135bcf WB |
420 | #endif |
421 | } | |
422 | ||
fdc5432a DB |
423 | static inline bool skb_at_tc_ingress(const struct sk_buff *skb) |
424 | { | |
425 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 426 | return skb->tc_at_ingress; |
fdc5432a DB |
427 | #else |
428 | return false; | |
429 | #endif | |
430 | } | |
431 | ||
e7246e12 WB |
432 | static inline bool skb_skip_tc_classify(struct sk_buff *skb) |
433 | { | |
434 | #ifdef CONFIG_NET_CLS_ACT | |
435 | if (skb->tc_skip_classify) { | |
436 | skb->tc_skip_classify = 0; | |
437 | return true; | |
438 | } | |
439 | #endif | |
440 | return false; | |
441 | } | |
442 | ||
f0796d5c JF |
443 | /* Reset all TX qdiscs greater then index of a device. */ |
444 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) | |
5aa70995 | 445 | { |
4ef6acff JF |
446 | struct Qdisc *qdisc; |
447 | ||
f0796d5c | 448 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 449 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
450 | if (qdisc) { |
451 | spin_lock_bh(qdisc_lock(qdisc)); | |
452 | qdisc_reset(qdisc); | |
453 | spin_unlock_bh(qdisc_lock(qdisc)); | |
454 | } | |
455 | } | |
5aa70995 DM |
456 | } |
457 | ||
5aa70995 DM |
458 | static inline void qdisc_reset_all_tx(struct net_device *dev) |
459 | { | |
f0796d5c | 460 | qdisc_reset_all_tx_gt(dev, 0); |
5aa70995 DM |
461 | } |
462 | ||
3e745dd6 DM |
463 | /* Are all TX queues of the device empty? */ |
464 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
465 | { | |
e8a0464c | 466 | unsigned int i; |
46e5da40 JF |
467 | |
468 | rcu_read_lock(); | |
e8a0464c DM |
469 | for (i = 0; i < dev->num_tx_queues; i++) { |
470 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 471 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 472 | |
46e5da40 JF |
473 | if (q->q.qlen) { |
474 | rcu_read_unlock(); | |
e8a0464c | 475 | return false; |
46e5da40 | 476 | } |
e8a0464c | 477 | } |
46e5da40 | 478 | rcu_read_unlock(); |
e8a0464c | 479 | return true; |
3e745dd6 DM |
480 | } |
481 | ||
6fa9864b | 482 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 483 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 484 | { |
e8a0464c | 485 | unsigned int i; |
46e5da40 | 486 | |
e8a0464c DM |
487 | for (i = 0; i < dev->num_tx_queues; i++) { |
488 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 489 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
490 | return true; |
491 | } | |
492 | return false; | |
6fa9864b DM |
493 | } |
494 | ||
e8a0464c | 495 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
496 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
497 | { | |
e8a0464c | 498 | unsigned int i; |
46e5da40 | 499 | |
e8a0464c DM |
500 | for (i = 0; i < dev->num_tx_queues; i++) { |
501 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 502 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
e8a0464c DM |
503 | return false; |
504 | } | |
505 | return true; | |
05297949 DM |
506 | } |
507 | ||
bfe0d029 | 508 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 509 | { |
175f9c1b | 510 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
511 | } |
512 | ||
c27f339a | 513 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
514 | enum net_xmit_qdisc_t { |
515 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 516 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
517 | }; |
518 | ||
c27f339a | 519 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 520 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
521 | #else |
522 | #define net_xmit_drop_count(e) (1) | |
523 | #endif | |
524 | ||
a2da570d ED |
525 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
526 | const struct Qdisc *sch) | |
5f86173b | 527 | { |
3a682fbd | 528 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
529 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
530 | ||
531 | if (stab) | |
532 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 533 | #endif |
a2da570d ED |
534 | } |
535 | ||
520ac30f ED |
536 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
537 | struct sk_buff **to_free) | |
a2da570d ED |
538 | { |
539 | qdisc_calculate_pkt_len(skb, sch); | |
520ac30f | 540 | return sch->enqueue(skb, sch, to_free); |
5f86173b JK |
541 | } |
542 | ||
22e0f8b9 JF |
543 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
544 | { | |
545 | return q->flags & TCQ_F_CPUSTATS; | |
546 | } | |
bfe0d029 | 547 | |
38040702 AV |
548 | static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, |
549 | __u64 bytes, __u32 packets) | |
550 | { | |
551 | bstats->bytes += bytes; | |
552 | bstats->packets += packets; | |
553 | } | |
554 | ||
bfe0d029 ED |
555 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, |
556 | const struct sk_buff *skb) | |
557 | { | |
38040702 AV |
558 | _bstats_update(bstats, |
559 | qdisc_pkt_len(skb), | |
560 | skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); | |
561 | } | |
562 | ||
563 | static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, | |
564 | __u64 bytes, __u32 packets) | |
565 | { | |
566 | u64_stats_update_begin(&bstats->syncp); | |
567 | _bstats_update(&bstats->bstats, bytes, packets); | |
568 | u64_stats_update_end(&bstats->syncp); | |
bfe0d029 ED |
569 | } |
570 | ||
24ea591d ED |
571 | static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, |
572 | const struct sk_buff *skb) | |
22e0f8b9 | 573 | { |
22e0f8b9 JF |
574 | u64_stats_update_begin(&bstats->syncp); |
575 | bstats_update(&bstats->bstats, skb); | |
576 | u64_stats_update_end(&bstats->syncp); | |
577 | } | |
578 | ||
24ea591d ED |
579 | static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
580 | const struct sk_buff *skb) | |
581 | { | |
582 | bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); | |
583 | } | |
584 | ||
bfe0d029 ED |
585 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
586 | const struct sk_buff *skb) | |
bbd8a0d3 | 587 | { |
bfe0d029 | 588 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
589 | } |
590 | ||
25331d6c JF |
591 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
592 | const struct sk_buff *skb) | |
593 | { | |
594 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
595 | } | |
596 | ||
597 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, | |
598 | const struct sk_buff *skb) | |
599 | { | |
600 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
601 | } | |
602 | ||
603 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) | |
604 | { | |
605 | sch->qstats.drops += count; | |
606 | } | |
607 | ||
24ea591d | 608 | static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
25331d6c | 609 | { |
24ea591d | 610 | qstats->drops++; |
25331d6c JF |
611 | } |
612 | ||
24ea591d | 613 | static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
b0ab6f92 | 614 | { |
24ea591d ED |
615 | qstats->overlimits++; |
616 | } | |
b0ab6f92 | 617 | |
24ea591d ED |
618 | static inline void qdisc_qstats_drop(struct Qdisc *sch) |
619 | { | |
620 | qstats_drop_inc(&sch->qstats); | |
621 | } | |
622 | ||
623 | static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) | |
624 | { | |
eb60a8dd | 625 | this_cpu_inc(sch->cpu_qstats->drops); |
b0ab6f92 JF |
626 | } |
627 | ||
25331d6c JF |
628 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
629 | { | |
630 | sch->qstats.overlimits++; | |
631 | } | |
632 | ||
48da34b7 FW |
633 | static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh) |
634 | { | |
635 | qh->head = NULL; | |
636 | qh->tail = NULL; | |
637 | qh->qlen = 0; | |
638 | } | |
639 | ||
9972b25d | 640 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
48da34b7 | 641 | struct qdisc_skb_head *qh) |
9972b25d | 642 | { |
48da34b7 FW |
643 | struct sk_buff *last = qh->tail; |
644 | ||
645 | if (last) { | |
646 | skb->next = NULL; | |
647 | last->next = skb; | |
648 | qh->tail = skb; | |
649 | } else { | |
650 | qh->tail = skb; | |
651 | qh->head = skb; | |
652 | } | |
653 | qh->qlen++; | |
25331d6c | 654 | qdisc_qstats_backlog_inc(sch, skb); |
9972b25d TG |
655 | |
656 | return NET_XMIT_SUCCESS; | |
657 | } | |
658 | ||
659 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
660 | { | |
661 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
662 | } | |
663 | ||
48da34b7 | 664 | static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) |
9972b25d | 665 | { |
48da34b7 FW |
666 | struct sk_buff *skb = qh->head; |
667 | ||
668 | if (likely(skb != NULL)) { | |
669 | qh->head = skb->next; | |
670 | qh->qlen--; | |
671 | if (qh->head == NULL) | |
672 | qh->tail = NULL; | |
673 | skb->next = NULL; | |
674 | } | |
9972b25d | 675 | |
ec323368 FW |
676 | return skb; |
677 | } | |
678 | ||
679 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
680 | { | |
681 | struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); | |
682 | ||
9190b3b3 | 683 | if (likely(skb != NULL)) { |
25331d6c | 684 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
685 | qdisc_bstats_update(sch, skb); |
686 | } | |
9972b25d TG |
687 | |
688 | return skb; | |
689 | } | |
690 | ||
520ac30f ED |
691 | /* Instead of calling kfree_skb() while root qdisc lock is held, |
692 | * queue the skb for future freeing at end of __dev_xmit_skb() | |
693 | */ | |
694 | static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) | |
695 | { | |
696 | skb->next = *to_free; | |
697 | *to_free = skb; | |
698 | } | |
699 | ||
57dbb2d8 | 700 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, |
48da34b7 | 701 | struct qdisc_skb_head *qh, |
520ac30f | 702 | struct sk_buff **to_free) |
57dbb2d8 | 703 | { |
48da34b7 | 704 | struct sk_buff *skb = __qdisc_dequeue_head(qh); |
57dbb2d8 HPP |
705 | |
706 | if (likely(skb != NULL)) { | |
707 | unsigned int len = qdisc_pkt_len(skb); | |
520ac30f | 708 | |
25331d6c | 709 | qdisc_qstats_backlog_dec(sch, skb); |
520ac30f | 710 | __qdisc_drop(skb, to_free); |
57dbb2d8 HPP |
711 | return len; |
712 | } | |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
520ac30f ED |
717 | static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch, |
718 | struct sk_buff **to_free) | |
57dbb2d8 | 719 | { |
520ac30f | 720 | return __qdisc_queue_drop_head(sch, &sch->q, to_free); |
9972b25d TG |
721 | } |
722 | ||
48a8f519 PM |
723 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
724 | { | |
48da34b7 FW |
725 | const struct qdisc_skb_head *qh = &sch->q; |
726 | ||
727 | return qh->head; | |
48a8f519 PM |
728 | } |
729 | ||
77be155c JP |
730 | /* generic pseudo peek method for non-work-conserving qdisc */ |
731 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
732 | { | |
733 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ | |
61c9eaf9 | 734 | if (!sch->gso_skb) { |
77be155c | 735 | sch->gso_skb = sch->dequeue(sch); |
a27758ff | 736 | if (sch->gso_skb) { |
61c9eaf9 | 737 | /* it's still part of the queue */ |
a27758ff | 738 | qdisc_qstats_backlog_inc(sch, sch->gso_skb); |
61c9eaf9 | 739 | sch->q.qlen++; |
a27758ff | 740 | } |
61c9eaf9 | 741 | } |
77be155c JP |
742 | |
743 | return sch->gso_skb; | |
744 | } | |
745 | ||
746 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
747 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
748 | { | |
749 | struct sk_buff *skb = sch->gso_skb; | |
750 | ||
61c9eaf9 | 751 | if (skb) { |
77be155c | 752 | sch->gso_skb = NULL; |
a27758ff | 753 | qdisc_qstats_backlog_dec(sch, skb); |
61c9eaf9 JP |
754 | sch->q.qlen--; |
755 | } else { | |
77be155c | 756 | skb = sch->dequeue(sch); |
61c9eaf9 | 757 | } |
77be155c JP |
758 | |
759 | return skb; | |
760 | } | |
761 | ||
48da34b7 | 762 | static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) |
9972b25d TG |
763 | { |
764 | /* | |
765 | * We do not know the backlog in bytes of this list, it | |
766 | * is up to the caller to correct it | |
767 | */ | |
48da34b7 FW |
768 | ASSERT_RTNL(); |
769 | if (qh->qlen) { | |
770 | rtnl_kfree_skbs(qh->head, qh->tail); | |
771 | ||
772 | qh->head = NULL; | |
773 | qh->tail = NULL; | |
774 | qh->qlen = 0; | |
1b5c5493 | 775 | } |
9972b25d TG |
776 | } |
777 | ||
778 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
779 | { | |
1b5c5493 | 780 | __qdisc_reset_queue(&sch->q); |
9972b25d TG |
781 | sch->qstats.backlog = 0; |
782 | } | |
783 | ||
86a7996c WC |
784 | static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, |
785 | struct Qdisc **pold) | |
786 | { | |
787 | struct Qdisc *old; | |
788 | ||
789 | sch_tree_lock(sch); | |
790 | old = *pold; | |
791 | *pold = new; | |
792 | if (old != NULL) { | |
2ccccf5f | 793 | qdisc_tree_reduce_backlog(old, old->q.qlen, old->qstats.backlog); |
86a7996c WC |
794 | qdisc_reset(old); |
795 | } | |
796 | sch_tree_unlock(sch); | |
797 | ||
798 | return old; | |
799 | } | |
800 | ||
1b5c5493 ED |
801 | static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) |
802 | { | |
803 | rtnl_kfree_skbs(skb, skb); | |
804 | qdisc_qstats_drop(sch); | |
805 | } | |
806 | ||
520ac30f ED |
807 | |
808 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, | |
809 | struct sk_buff **to_free) | |
9972b25d | 810 | { |
520ac30f | 811 | __qdisc_drop(skb, to_free); |
25331d6c | 812 | qdisc_qstats_drop(sch); |
9972b25d TG |
813 | |
814 | return NET_XMIT_DROP; | |
815 | } | |
816 | ||
e9bef55d JDB |
817 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
818 | long it will take to send a packet given its size. | |
819 | */ | |
820 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
821 | { | |
e08b0998 JDB |
822 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
823 | if (slot < 0) | |
824 | slot = 0; | |
e9bef55d JDB |
825 | slot >>= rtab->rate.cell_log; |
826 | if (slot > 255) | |
a02cec21 | 827 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
828 | return rtab->data[slot]; |
829 | } | |
830 | ||
292f1c7f | 831 | struct psched_ratecfg { |
130d3d68 | 832 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
833 | u32 mult; |
834 | u16 overhead; | |
8a8e3d84 | 835 | u8 linklayer; |
01cb71d2 | 836 | u8 shift; |
292f1c7f JP |
837 | }; |
838 | ||
839 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
840 | unsigned int len) | |
841 | { | |
8a8e3d84 JDB |
842 | len += r->overhead; |
843 | ||
844 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
845 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
846 | ||
847 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
848 | } |
849 | ||
5c15257f | 850 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
851 | const struct tc_ratespec *conf, |
852 | u64 rate64); | |
292f1c7f | 853 | |
01cb71d2 ED |
854 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
855 | const struct psched_ratecfg *r) | |
292f1c7f | 856 | { |
01cb71d2 | 857 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
858 | |
859 | /* legacy struct tc_ratespec has a 32bit @rate field | |
860 | * Qdisc using 64bit rate should add new attributes | |
861 | * in order to maintain compatibility. | |
862 | */ | |
863 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
864 | ||
01cb71d2 | 865 | res->overhead = r->overhead; |
8a8e3d84 | 866 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
867 | } |
868 | ||
1da177e4 | 869 | #endif |