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 | 81 | struct gnet_stats_rate_est64 rate_est; |
0d32ef8c ED |
82 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; |
83 | struct gnet_stats_queue __percpu *cpu_qstats; | |
84 | ||
45203a3b | 85 | struct Qdisc *next_sched; |
5e140dfc ED |
86 | struct sk_buff *gso_skb; |
87 | /* | |
88 | * For performance sake on SMP, we put highly modified fields at the end | |
89 | */ | |
90 | unsigned long state; | |
91 | struct sk_buff_head q; | |
0d32ef8c | 92 | struct gnet_stats_basic_packed bstats; |
fd245a4a | 93 | unsigned int __state; |
0d32ef8c | 94 | struct gnet_stats_queue qstats; |
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 | { |
fd245a4a | 104 | return (qdisc->__state & __QDISC___STATE_RUNNING) ? 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; | |
111 | qdisc->__state |= __QDISC___STATE_RUNNING; | |
112 | return true; | |
bc135b23 ED |
113 | } |
114 | ||
115 | static inline void qdisc_run_end(struct Qdisc *qdisc) | |
116 | { | |
fd245a4a ED |
117 | qdisc->__state &= ~__QDISC___STATE_RUNNING; |
118 | } | |
119 | ||
5772e9a3 JDB |
120 | static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) |
121 | { | |
122 | return qdisc->flags & TCQ_F_ONETXQUEUE; | |
123 | } | |
124 | ||
125 | static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) | |
126 | { | |
127 | #ifdef CONFIG_BQL | |
128 | /* Non-BQL migrated drivers will return 0, too. */ | |
129 | return dql_avail(&txq->dql); | |
130 | #else | |
131 | return 0; | |
132 | #endif | |
133 | } | |
134 | ||
fd245a4a ED |
135 | static inline bool qdisc_is_throttled(const struct Qdisc *qdisc) |
136 | { | |
ef352e7c | 137 | return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false; |
fd245a4a ED |
138 | } |
139 | ||
140 | static inline void qdisc_throttled(struct Qdisc *qdisc) | |
141 | { | |
ef352e7c | 142 | set_bit(__QDISC_STATE_THROTTLED, &qdisc->state); |
fd245a4a ED |
143 | } |
144 | ||
145 | static inline void qdisc_unthrottled(struct Qdisc *qdisc) | |
146 | { | |
ef352e7c | 147 | clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state); |
bc135b23 ED |
148 | } |
149 | ||
fd2c3ef7 | 150 | struct Qdisc_class_ops { |
1da177e4 | 151 | /* Child qdisc manipulation */ |
926e61b7 | 152 | struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); |
1da177e4 LT |
153 | int (*graft)(struct Qdisc *, unsigned long cl, |
154 | struct Qdisc *, struct Qdisc **); | |
155 | struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); | |
43effa1e | 156 | void (*qlen_notify)(struct Qdisc *, unsigned long); |
1da177e4 LT |
157 | |
158 | /* Class manipulation routines */ | |
159 | unsigned long (*get)(struct Qdisc *, u32 classid); | |
160 | void (*put)(struct Qdisc *, unsigned long); | |
161 | int (*change)(struct Qdisc *, u32, u32, | |
1e90474c | 162 | struct nlattr **, unsigned long *); |
1da177e4 LT |
163 | int (*delete)(struct Qdisc *, unsigned long); |
164 | void (*walk)(struct Qdisc *, struct qdisc_walker * arg); | |
165 | ||
166 | /* Filter manipulation */ | |
25d8c0d5 | 167 | struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long); |
1da177e4 LT |
168 | unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, |
169 | u32 classid); | |
170 | void (*unbind_tcf)(struct Qdisc *, unsigned long); | |
171 | ||
172 | /* rtnetlink specific */ | |
173 | int (*dump)(struct Qdisc *, unsigned long, | |
174 | struct sk_buff *skb, struct tcmsg*); | |
175 | int (*dump_stats)(struct Qdisc *, unsigned long, | |
176 | struct gnet_dump *); | |
177 | }; | |
178 | ||
fd2c3ef7 | 179 | struct Qdisc_ops { |
1da177e4 | 180 | struct Qdisc_ops *next; |
20fea08b | 181 | const struct Qdisc_class_ops *cl_ops; |
1da177e4 LT |
182 | char id[IFNAMSIZ]; |
183 | int priv_size; | |
184 | ||
185 | int (*enqueue)(struct sk_buff *, struct Qdisc *); | |
186 | struct sk_buff * (*dequeue)(struct Qdisc *); | |
90d841fd | 187 | struct sk_buff * (*peek)(struct Qdisc *); |
1da177e4 LT |
188 | unsigned int (*drop)(struct Qdisc *); |
189 | ||
1e90474c | 190 | int (*init)(struct Qdisc *, struct nlattr *arg); |
1da177e4 LT |
191 | void (*reset)(struct Qdisc *); |
192 | void (*destroy)(struct Qdisc *); | |
1e90474c | 193 | int (*change)(struct Qdisc *, struct nlattr *arg); |
6ec1c69a | 194 | void (*attach)(struct Qdisc *); |
1da177e4 LT |
195 | |
196 | int (*dump)(struct Qdisc *, struct sk_buff *); | |
197 | int (*dump_stats)(struct Qdisc *, struct gnet_dump *); | |
198 | ||
199 | struct module *owner; | |
200 | }; | |
201 | ||
202 | ||
fd2c3ef7 | 203 | struct tcf_result { |
1da177e4 LT |
204 | unsigned long class; |
205 | u32 classid; | |
206 | }; | |
207 | ||
fd2c3ef7 | 208 | struct tcf_proto_ops { |
36272874 | 209 | struct list_head head; |
1da177e4 LT |
210 | char kind[IFNAMSIZ]; |
211 | ||
dc7f9f6e ED |
212 | int (*classify)(struct sk_buff *, |
213 | const struct tcf_proto *, | |
214 | struct tcf_result *); | |
1da177e4 | 215 | int (*init)(struct tcf_proto*); |
1e052be6 | 216 | bool (*destroy)(struct tcf_proto*, bool); |
1da177e4 LT |
217 | |
218 | unsigned long (*get)(struct tcf_proto*, u32 handle); | |
c1b52739 | 219 | int (*change)(struct net *net, struct sk_buff *, |
af4c6641 | 220 | struct tcf_proto*, unsigned long, |
add93b61 | 221 | u32 handle, struct nlattr **, |
2f7ef2f8 | 222 | unsigned long *, bool); |
1da177e4 LT |
223 | int (*delete)(struct tcf_proto*, unsigned long); |
224 | void (*walk)(struct tcf_proto*, struct tcf_walker *arg); | |
225 | ||
226 | /* rtnetlink specific */ | |
832d1d5b | 227 | int (*dump)(struct net*, struct tcf_proto*, unsigned long, |
1da177e4 LT |
228 | struct sk_buff *skb, struct tcmsg*); |
229 | ||
230 | struct module *owner; | |
231 | }; | |
232 | ||
fd2c3ef7 | 233 | struct tcf_proto { |
1da177e4 | 234 | /* Fast access part */ |
25d8c0d5 JF |
235 | struct tcf_proto __rcu *next; |
236 | void __rcu *root; | |
dc7f9f6e ED |
237 | int (*classify)(struct sk_buff *, |
238 | const struct tcf_proto *, | |
239 | struct tcf_result *); | |
66c6f529 | 240 | __be16 protocol; |
1da177e4 LT |
241 | |
242 | /* All the rest */ | |
243 | u32 prio; | |
244 | u32 classid; | |
245 | struct Qdisc *q; | |
246 | void *data; | |
dc7f9f6e | 247 | const struct tcf_proto_ops *ops; |
25d8c0d5 | 248 | struct rcu_head rcu; |
1da177e4 LT |
249 | }; |
250 | ||
175f9c1b JK |
251 | struct qdisc_skb_cb { |
252 | unsigned int pkt_len; | |
df4ab5b3 | 253 | u16 slave_dev_queue_mapping; |
045efa82 | 254 | u16 tc_classid; |
25711786 ED |
255 | #define QDISC_CB_PRIV_LEN 20 |
256 | unsigned char data[QDISC_CB_PRIV_LEN]; | |
175f9c1b JK |
257 | }; |
258 | ||
16bda13d DM |
259 | static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
260 | { | |
261 | struct qdisc_skb_cb *qcb; | |
5ee31c68 ED |
262 | |
263 | BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); | |
16bda13d DM |
264 | BUILD_BUG_ON(sizeof(qcb->data) < sz); |
265 | } | |
266 | ||
05bdd2f1 | 267 | static inline int qdisc_qlen(const struct Qdisc *q) |
bbd8a0d3 KK |
268 | { |
269 | return q->q.qlen; | |
270 | } | |
271 | ||
bfe0d029 | 272 | static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
175f9c1b JK |
273 | { |
274 | return (struct qdisc_skb_cb *)skb->cb; | |
275 | } | |
276 | ||
83874000 DM |
277 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
278 | { | |
279 | return &qdisc->q.lock; | |
280 | } | |
281 | ||
05bdd2f1 | 282 | static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
7698b4fc | 283 | { |
46e5da40 JF |
284 | struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
285 | ||
286 | return q; | |
7698b4fc DM |
287 | } |
288 | ||
05bdd2f1 | 289 | static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
2540e051 JP |
290 | { |
291 | return qdisc->dev_queue->qdisc_sleeping; | |
292 | } | |
293 | ||
7e43f112 DM |
294 | /* The qdisc root lock is a mechanism by which to top level |
295 | * of a qdisc tree can be locked from any qdisc node in the | |
296 | * forest. This allows changing the configuration of some | |
297 | * aspect of the qdisc tree while blocking out asynchronous | |
298 | * qdisc access in the packet processing paths. | |
299 | * | |
300 | * It is only legal to do this when the root will not change | |
301 | * on us. Otherwise we'll potentially lock the wrong qdisc | |
302 | * root. This is enforced by holding the RTNL semaphore, which | |
303 | * all users of this lock accessor must do. | |
304 | */ | |
05bdd2f1 | 305 | static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) |
7698b4fc DM |
306 | { |
307 | struct Qdisc *root = qdisc_root(qdisc); | |
308 | ||
7e43f112 | 309 | ASSERT_RTNL(); |
83874000 | 310 | return qdisc_lock(root); |
7698b4fc DM |
311 | } |
312 | ||
05bdd2f1 | 313 | static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
f6f9b93f JP |
314 | { |
315 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
316 | ||
317 | ASSERT_RTNL(); | |
318 | return qdisc_lock(root); | |
319 | } | |
320 | ||
05bdd2f1 | 321 | static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) |
5ce2d488 DM |
322 | { |
323 | return qdisc->dev_queue->dev; | |
324 | } | |
1da177e4 | 325 | |
05bdd2f1 | 326 | static inline void sch_tree_lock(const struct Qdisc *q) |
78a5b30b | 327 | { |
fe439dd0 | 328 | spin_lock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
329 | } |
330 | ||
05bdd2f1 | 331 | static inline void sch_tree_unlock(const struct Qdisc *q) |
78a5b30b | 332 | { |
fe439dd0 | 333 | spin_unlock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
334 | } |
335 | ||
336 | #define tcf_tree_lock(tp) sch_tree_lock((tp)->q) | |
337 | #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q) | |
1da177e4 | 338 | |
e41a33e6 TG |
339 | extern struct Qdisc noop_qdisc; |
340 | extern struct Qdisc_ops noop_qdisc_ops; | |
6ec1c69a DM |
341 | extern struct Qdisc_ops pfifo_fast_ops; |
342 | extern struct Qdisc_ops mq_qdisc_ops; | |
d66d6c31 | 343 | extern struct Qdisc_ops noqueue_qdisc_ops; |
6da7c8fc | 344 | extern const struct Qdisc_ops *default_qdisc_ops; |
e41a33e6 | 345 | |
fd2c3ef7 | 346 | struct Qdisc_class_common { |
6fe1c7a5 PM |
347 | u32 classid; |
348 | struct hlist_node hnode; | |
349 | }; | |
350 | ||
fd2c3ef7 | 351 | struct Qdisc_class_hash { |
6fe1c7a5 PM |
352 | struct hlist_head *hash; |
353 | unsigned int hashsize; | |
354 | unsigned int hashmask; | |
355 | unsigned int hashelems; | |
356 | }; | |
357 | ||
358 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
359 | { | |
360 | id ^= id >> 8; | |
361 | id ^= id >> 4; | |
362 | return id & mask; | |
363 | } | |
364 | ||
365 | static inline struct Qdisc_class_common * | |
05bdd2f1 | 366 | qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
6fe1c7a5 PM |
367 | { |
368 | struct Qdisc_class_common *cl; | |
6fe1c7a5 PM |
369 | unsigned int h; |
370 | ||
371 | h = qdisc_class_hash(id, hash->hashmask); | |
b67bfe0d | 372 | hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
6fe1c7a5 PM |
373 | if (cl->classid == id) |
374 | return cl; | |
375 | } | |
376 | return NULL; | |
377 | } | |
378 | ||
5c15257f JP |
379 | int qdisc_class_hash_init(struct Qdisc_class_hash *); |
380 | void qdisc_class_hash_insert(struct Qdisc_class_hash *, | |
381 | struct Qdisc_class_common *); | |
382 | void qdisc_class_hash_remove(struct Qdisc_class_hash *, | |
383 | struct Qdisc_class_common *); | |
384 | void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
385 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
386 | ||
387 | void dev_init_scheduler(struct net_device *dev); | |
388 | void dev_shutdown(struct net_device *dev); | |
389 | void dev_activate(struct net_device *dev); | |
390 | void dev_deactivate(struct net_device *dev); | |
391 | void dev_deactivate_many(struct list_head *head); | |
392 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
393 | struct Qdisc *qdisc); | |
394 | void qdisc_reset(struct Qdisc *qdisc); | |
395 | void qdisc_destroy(struct Qdisc *qdisc); | |
396 | void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n); | |
397 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, | |
d2a7f269 | 398 | const struct Qdisc_ops *ops); |
5c15257f | 399 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 400 | const struct Qdisc_ops *ops, u32 parentid); |
5c15257f JP |
401 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
402 | const struct qdisc_size_table *stab); | |
1e052be6 | 403 | bool tcf_destroy(struct tcf_proto *tp, bool force); |
25d8c0d5 | 404 | void tcf_destroy_chain(struct tcf_proto __rcu **fl); |
1da177e4 | 405 | |
f0796d5c JF |
406 | /* Reset all TX qdiscs greater then index of a device. */ |
407 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) | |
5aa70995 | 408 | { |
4ef6acff JF |
409 | struct Qdisc *qdisc; |
410 | ||
f0796d5c | 411 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 412 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
413 | if (qdisc) { |
414 | spin_lock_bh(qdisc_lock(qdisc)); | |
415 | qdisc_reset(qdisc); | |
416 | spin_unlock_bh(qdisc_lock(qdisc)); | |
417 | } | |
418 | } | |
5aa70995 DM |
419 | } |
420 | ||
5aa70995 DM |
421 | static inline void qdisc_reset_all_tx(struct net_device *dev) |
422 | { | |
f0796d5c | 423 | qdisc_reset_all_tx_gt(dev, 0); |
5aa70995 DM |
424 | } |
425 | ||
3e745dd6 DM |
426 | /* Are all TX queues of the device empty? */ |
427 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
428 | { | |
e8a0464c | 429 | unsigned int i; |
46e5da40 JF |
430 | |
431 | rcu_read_lock(); | |
e8a0464c DM |
432 | for (i = 0; i < dev->num_tx_queues; i++) { |
433 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 434 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 435 | |
46e5da40 JF |
436 | if (q->q.qlen) { |
437 | rcu_read_unlock(); | |
e8a0464c | 438 | return false; |
46e5da40 | 439 | } |
e8a0464c | 440 | } |
46e5da40 | 441 | rcu_read_unlock(); |
e8a0464c | 442 | return true; |
3e745dd6 DM |
443 | } |
444 | ||
6fa9864b | 445 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 446 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 447 | { |
e8a0464c | 448 | unsigned int i; |
46e5da40 | 449 | |
e8a0464c DM |
450 | for (i = 0; i < dev->num_tx_queues; i++) { |
451 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 452 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
453 | return true; |
454 | } | |
455 | return false; | |
6fa9864b DM |
456 | } |
457 | ||
e8a0464c | 458 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
459 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
460 | { | |
e8a0464c | 461 | unsigned int i; |
46e5da40 | 462 | |
e8a0464c DM |
463 | for (i = 0; i < dev->num_tx_queues; i++) { |
464 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 465 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
e8a0464c DM |
466 | return false; |
467 | } | |
468 | return true; | |
05297949 DM |
469 | } |
470 | ||
bfe0d029 | 471 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 472 | { |
175f9c1b | 473 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
474 | } |
475 | ||
c27f339a | 476 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
477 | enum net_xmit_qdisc_t { |
478 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 479 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
480 | }; |
481 | ||
c27f339a | 482 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 483 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
484 | #else |
485 | #define net_xmit_drop_count(e) (1) | |
486 | #endif | |
487 | ||
a2da570d ED |
488 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
489 | const struct Qdisc *sch) | |
5f86173b | 490 | { |
3a682fbd | 491 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
492 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
493 | ||
494 | if (stab) | |
495 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 496 | #endif |
a2da570d ED |
497 | } |
498 | ||
499 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch) | |
500 | { | |
501 | qdisc_calculate_pkt_len(skb, sch); | |
5f86173b JK |
502 | return sch->enqueue(skb, sch); |
503 | } | |
504 | ||
22e0f8b9 JF |
505 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
506 | { | |
507 | return q->flags & TCQ_F_CPUSTATS; | |
508 | } | |
bfe0d029 ED |
509 | |
510 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, | |
511 | const struct sk_buff *skb) | |
512 | { | |
513 | bstats->bytes += qdisc_pkt_len(skb); | |
514 | bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1; | |
515 | } | |
516 | ||
24ea591d ED |
517 | static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, |
518 | const struct sk_buff *skb) | |
22e0f8b9 | 519 | { |
22e0f8b9 JF |
520 | u64_stats_update_begin(&bstats->syncp); |
521 | bstats_update(&bstats->bstats, skb); | |
522 | u64_stats_update_end(&bstats->syncp); | |
523 | } | |
524 | ||
24ea591d ED |
525 | static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
526 | const struct sk_buff *skb) | |
527 | { | |
528 | bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); | |
529 | } | |
530 | ||
bfe0d029 ED |
531 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
532 | const struct sk_buff *skb) | |
bbd8a0d3 | 533 | { |
bfe0d029 | 534 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
535 | } |
536 | ||
25331d6c JF |
537 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
538 | const struct sk_buff *skb) | |
539 | { | |
540 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
541 | } | |
542 | ||
543 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, | |
544 | const struct sk_buff *skb) | |
545 | { | |
546 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
547 | } | |
548 | ||
549 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) | |
550 | { | |
551 | sch->qstats.drops += count; | |
552 | } | |
553 | ||
24ea591d | 554 | static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
25331d6c | 555 | { |
24ea591d | 556 | qstats->drops++; |
25331d6c JF |
557 | } |
558 | ||
24ea591d | 559 | static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
b0ab6f92 | 560 | { |
24ea591d ED |
561 | qstats->overlimits++; |
562 | } | |
b0ab6f92 | 563 | |
24ea591d ED |
564 | static inline void qdisc_qstats_drop(struct Qdisc *sch) |
565 | { | |
566 | qstats_drop_inc(&sch->qstats); | |
567 | } | |
568 | ||
569 | static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) | |
570 | { | |
571 | qstats_drop_inc(this_cpu_ptr(sch->cpu_qstats)); | |
b0ab6f92 JF |
572 | } |
573 | ||
25331d6c JF |
574 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
575 | { | |
576 | sch->qstats.overlimits++; | |
577 | } | |
578 | ||
9972b25d TG |
579 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
580 | struct sk_buff_head *list) | |
581 | { | |
582 | __skb_queue_tail(list, skb); | |
25331d6c | 583 | qdisc_qstats_backlog_inc(sch, skb); |
9972b25d TG |
584 | |
585 | return NET_XMIT_SUCCESS; | |
586 | } | |
587 | ||
588 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
589 | { | |
590 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
591 | } | |
592 | ||
593 | static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch, | |
594 | struct sk_buff_head *list) | |
595 | { | |
596 | struct sk_buff *skb = __skb_dequeue(list); | |
597 | ||
9190b3b3 | 598 | if (likely(skb != NULL)) { |
25331d6c | 599 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
600 | qdisc_bstats_update(sch, skb); |
601 | } | |
9972b25d TG |
602 | |
603 | return skb; | |
604 | } | |
605 | ||
606 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
607 | { | |
608 | return __qdisc_dequeue_head(sch, &sch->q); | |
57dbb2d8 HPP |
609 | } |
610 | ||
611 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, | |
612 | struct sk_buff_head *list) | |
613 | { | |
9190b3b3 | 614 | struct sk_buff *skb = __skb_dequeue(list); |
57dbb2d8 HPP |
615 | |
616 | if (likely(skb != NULL)) { | |
617 | unsigned int len = qdisc_pkt_len(skb); | |
25331d6c | 618 | qdisc_qstats_backlog_dec(sch, skb); |
57dbb2d8 HPP |
619 | kfree_skb(skb); |
620 | return len; | |
621 | } | |
622 | ||
623 | return 0; | |
624 | } | |
625 | ||
626 | static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch) | |
627 | { | |
628 | return __qdisc_queue_drop_head(sch, &sch->q); | |
9972b25d TG |
629 | } |
630 | ||
631 | static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch, | |
632 | struct sk_buff_head *list) | |
633 | { | |
634 | struct sk_buff *skb = __skb_dequeue_tail(list); | |
635 | ||
636 | if (likely(skb != NULL)) | |
25331d6c | 637 | qdisc_qstats_backlog_dec(sch, skb); |
9972b25d TG |
638 | |
639 | return skb; | |
640 | } | |
641 | ||
642 | static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch) | |
643 | { | |
644 | return __qdisc_dequeue_tail(sch, &sch->q); | |
645 | } | |
646 | ||
48a8f519 PM |
647 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
648 | { | |
649 | return skb_peek(&sch->q); | |
650 | } | |
651 | ||
77be155c JP |
652 | /* generic pseudo peek method for non-work-conserving qdisc */ |
653 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
654 | { | |
655 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ | |
61c9eaf9 | 656 | if (!sch->gso_skb) { |
77be155c | 657 | sch->gso_skb = sch->dequeue(sch); |
61c9eaf9 JP |
658 | if (sch->gso_skb) |
659 | /* it's still part of the queue */ | |
660 | sch->q.qlen++; | |
661 | } | |
77be155c JP |
662 | |
663 | return sch->gso_skb; | |
664 | } | |
665 | ||
666 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
667 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
668 | { | |
669 | struct sk_buff *skb = sch->gso_skb; | |
670 | ||
61c9eaf9 | 671 | if (skb) { |
77be155c | 672 | sch->gso_skb = NULL; |
61c9eaf9 JP |
673 | sch->q.qlen--; |
674 | } else { | |
77be155c | 675 | skb = sch->dequeue(sch); |
61c9eaf9 | 676 | } |
77be155c JP |
677 | |
678 | return skb; | |
679 | } | |
680 | ||
9972b25d TG |
681 | static inline void __qdisc_reset_queue(struct Qdisc *sch, |
682 | struct sk_buff_head *list) | |
683 | { | |
684 | /* | |
685 | * We do not know the backlog in bytes of this list, it | |
686 | * is up to the caller to correct it | |
687 | */ | |
93245dd6 | 688 | __skb_queue_purge(list); |
9972b25d TG |
689 | } |
690 | ||
691 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
692 | { | |
693 | __qdisc_reset_queue(sch, &sch->q); | |
694 | sch->qstats.backlog = 0; | |
695 | } | |
696 | ||
697 | static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch, | |
698 | struct sk_buff_head *list) | |
699 | { | |
700 | struct sk_buff *skb = __qdisc_dequeue_tail(sch, list); | |
701 | ||
702 | if (likely(skb != NULL)) { | |
0abf77e5 | 703 | unsigned int len = qdisc_pkt_len(skb); |
9972b25d TG |
704 | kfree_skb(skb); |
705 | return len; | |
706 | } | |
707 | ||
708 | return 0; | |
709 | } | |
710 | ||
711 | static inline unsigned int qdisc_queue_drop(struct Qdisc *sch) | |
712 | { | |
713 | return __qdisc_queue_drop(sch, &sch->q); | |
714 | } | |
715 | ||
716 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) | |
717 | { | |
718 | kfree_skb(skb); | |
25331d6c | 719 | qdisc_qstats_drop(sch); |
9972b25d TG |
720 | |
721 | return NET_XMIT_DROP; | |
722 | } | |
723 | ||
724 | static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch) | |
725 | { | |
25331d6c | 726 | qdisc_qstats_drop(sch); |
9972b25d | 727 | |
c3bc7cff | 728 | #ifdef CONFIG_NET_CLS_ACT |
9972b25d TG |
729 | if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch)) |
730 | goto drop; | |
731 | ||
732 | return NET_XMIT_SUCCESS; | |
733 | ||
734 | drop: | |
735 | #endif | |
736 | kfree_skb(skb); | |
737 | return NET_XMIT_DROP; | |
738 | } | |
739 | ||
e9bef55d JDB |
740 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
741 | long it will take to send a packet given its size. | |
742 | */ | |
743 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
744 | { | |
e08b0998 JDB |
745 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
746 | if (slot < 0) | |
747 | slot = 0; | |
e9bef55d JDB |
748 | slot >>= rtab->rate.cell_log; |
749 | if (slot > 255) | |
a02cec21 | 750 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
751 | return rtab->data[slot]; |
752 | } | |
753 | ||
292f1c7f | 754 | struct psched_ratecfg { |
130d3d68 | 755 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
756 | u32 mult; |
757 | u16 overhead; | |
8a8e3d84 | 758 | u8 linklayer; |
01cb71d2 | 759 | u8 shift; |
292f1c7f JP |
760 | }; |
761 | ||
762 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
763 | unsigned int len) | |
764 | { | |
8a8e3d84 JDB |
765 | len += r->overhead; |
766 | ||
767 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
768 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
769 | ||
770 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
771 | } |
772 | ||
5c15257f | 773 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
774 | const struct tc_ratespec *conf, |
775 | u64 rate64); | |
292f1c7f | 776 | |
01cb71d2 ED |
777 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
778 | const struct psched_ratecfg *r) | |
292f1c7f | 779 | { |
01cb71d2 | 780 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
781 | |
782 | /* legacy struct tc_ratespec has a 32bit @rate field | |
783 | * Qdisc using 64bit rate should add new attributes | |
784 | * in order to maintain compatibility. | |
785 | */ | |
786 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
787 | ||
01cb71d2 | 788 | res->overhead = r->overhead; |
8a8e3d84 | 789 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
790 | } |
791 | ||
1da177e4 | 792 | #endif |