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 LT |
215 | int (*init)(struct tcf_proto*); |
216 | void (*destroy)(struct tcf_proto*); | |
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; |
5ee31c68 | 254 | u16 _pad; |
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; | |
6da7c8fc | 343 | extern const struct Qdisc_ops *default_qdisc_ops; |
e41a33e6 | 344 | |
fd2c3ef7 | 345 | struct Qdisc_class_common { |
6fe1c7a5 PM |
346 | u32 classid; |
347 | struct hlist_node hnode; | |
348 | }; | |
349 | ||
fd2c3ef7 | 350 | struct Qdisc_class_hash { |
6fe1c7a5 PM |
351 | struct hlist_head *hash; |
352 | unsigned int hashsize; | |
353 | unsigned int hashmask; | |
354 | unsigned int hashelems; | |
355 | }; | |
356 | ||
357 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
358 | { | |
359 | id ^= id >> 8; | |
360 | id ^= id >> 4; | |
361 | return id & mask; | |
362 | } | |
363 | ||
364 | static inline struct Qdisc_class_common * | |
05bdd2f1 | 365 | qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
6fe1c7a5 PM |
366 | { |
367 | struct Qdisc_class_common *cl; | |
6fe1c7a5 PM |
368 | unsigned int h; |
369 | ||
370 | h = qdisc_class_hash(id, hash->hashmask); | |
b67bfe0d | 371 | hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
6fe1c7a5 PM |
372 | if (cl->classid == id) |
373 | return cl; | |
374 | } | |
375 | return NULL; | |
376 | } | |
377 | ||
5c15257f JP |
378 | int qdisc_class_hash_init(struct Qdisc_class_hash *); |
379 | void qdisc_class_hash_insert(struct Qdisc_class_hash *, | |
380 | struct Qdisc_class_common *); | |
381 | void qdisc_class_hash_remove(struct Qdisc_class_hash *, | |
382 | struct Qdisc_class_common *); | |
383 | void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
384 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
385 | ||
386 | void dev_init_scheduler(struct net_device *dev); | |
387 | void dev_shutdown(struct net_device *dev); | |
388 | void dev_activate(struct net_device *dev); | |
389 | void dev_deactivate(struct net_device *dev); | |
390 | void dev_deactivate_many(struct list_head *head); | |
391 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
392 | struct Qdisc *qdisc); | |
393 | void qdisc_reset(struct Qdisc *qdisc); | |
394 | void qdisc_destroy(struct Qdisc *qdisc); | |
395 | void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n); | |
396 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, | |
d2a7f269 | 397 | const struct Qdisc_ops *ops); |
5c15257f | 398 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
d2a7f269 | 399 | const struct Qdisc_ops *ops, u32 parentid); |
5c15257f JP |
400 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
401 | const struct qdisc_size_table *stab); | |
402 | void tcf_destroy(struct tcf_proto *tp); | |
25d8c0d5 | 403 | void tcf_destroy_chain(struct tcf_proto __rcu **fl); |
1da177e4 | 404 | |
f0796d5c JF |
405 | /* Reset all TX qdiscs greater then index of a device. */ |
406 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) | |
5aa70995 | 407 | { |
4ef6acff JF |
408 | struct Qdisc *qdisc; |
409 | ||
f0796d5c | 410 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 411 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
412 | if (qdisc) { |
413 | spin_lock_bh(qdisc_lock(qdisc)); | |
414 | qdisc_reset(qdisc); | |
415 | spin_unlock_bh(qdisc_lock(qdisc)); | |
416 | } | |
417 | } | |
5aa70995 DM |
418 | } |
419 | ||
5aa70995 DM |
420 | static inline void qdisc_reset_all_tx(struct net_device *dev) |
421 | { | |
f0796d5c | 422 | qdisc_reset_all_tx_gt(dev, 0); |
5aa70995 DM |
423 | } |
424 | ||
3e745dd6 DM |
425 | /* Are all TX queues of the device empty? */ |
426 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
427 | { | |
e8a0464c | 428 | unsigned int i; |
46e5da40 JF |
429 | |
430 | rcu_read_lock(); | |
e8a0464c DM |
431 | for (i = 0; i < dev->num_tx_queues; i++) { |
432 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 433 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 434 | |
46e5da40 JF |
435 | if (q->q.qlen) { |
436 | rcu_read_unlock(); | |
e8a0464c | 437 | return false; |
46e5da40 | 438 | } |
e8a0464c | 439 | } |
46e5da40 | 440 | rcu_read_unlock(); |
e8a0464c | 441 | return true; |
3e745dd6 DM |
442 | } |
443 | ||
6fa9864b | 444 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 445 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 446 | { |
e8a0464c | 447 | unsigned int i; |
46e5da40 | 448 | |
e8a0464c DM |
449 | for (i = 0; i < dev->num_tx_queues; i++) { |
450 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 451 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
452 | return true; |
453 | } | |
454 | return false; | |
6fa9864b DM |
455 | } |
456 | ||
e8a0464c | 457 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
458 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
459 | { | |
e8a0464c | 460 | unsigned int i; |
46e5da40 | 461 | |
e8a0464c DM |
462 | for (i = 0; i < dev->num_tx_queues; i++) { |
463 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 464 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
e8a0464c DM |
465 | return false; |
466 | } | |
467 | return true; | |
05297949 DM |
468 | } |
469 | ||
bfe0d029 | 470 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 471 | { |
175f9c1b | 472 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
473 | } |
474 | ||
c27f339a | 475 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
476 | enum net_xmit_qdisc_t { |
477 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 478 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
479 | }; |
480 | ||
c27f339a | 481 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 482 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
483 | #else |
484 | #define net_xmit_drop_count(e) (1) | |
485 | #endif | |
486 | ||
a2da570d ED |
487 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
488 | const struct Qdisc *sch) | |
5f86173b | 489 | { |
3a682fbd | 490 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
491 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
492 | ||
493 | if (stab) | |
494 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 495 | #endif |
a2da570d ED |
496 | } |
497 | ||
498 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch) | |
499 | { | |
500 | qdisc_calculate_pkt_len(skb, sch); | |
5f86173b JK |
501 | return sch->enqueue(skb, sch); |
502 | } | |
503 | ||
504 | static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch) | |
505 | { | |
175f9c1b | 506 | qdisc_skb_cb(skb)->pkt_len = skb->len; |
378a2f09 | 507 | return qdisc_enqueue(skb, sch) & NET_XMIT_MASK; |
5f86173b JK |
508 | } |
509 | ||
22e0f8b9 JF |
510 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
511 | { | |
512 | return q->flags & TCQ_F_CPUSTATS; | |
513 | } | |
bfe0d029 ED |
514 | |
515 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, | |
516 | const struct sk_buff *skb) | |
517 | { | |
518 | bstats->bytes += qdisc_pkt_len(skb); | |
519 | bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1; | |
520 | } | |
521 | ||
22e0f8b9 JF |
522 | static inline void qdisc_bstats_update_cpu(struct Qdisc *sch, |
523 | const struct sk_buff *skb) | |
524 | { | |
525 | struct gnet_stats_basic_cpu *bstats = | |
526 | this_cpu_ptr(sch->cpu_bstats); | |
527 | ||
528 | u64_stats_update_begin(&bstats->syncp); | |
529 | bstats_update(&bstats->bstats, skb); | |
530 | u64_stats_update_end(&bstats->syncp); | |
531 | } | |
532 | ||
bfe0d029 ED |
533 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
534 | const struct sk_buff *skb) | |
bbd8a0d3 | 535 | { |
bfe0d029 | 536 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
537 | } |
538 | ||
25331d6c JF |
539 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
540 | const struct sk_buff *skb) | |
541 | { | |
542 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
543 | } | |
544 | ||
545 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, | |
546 | const struct sk_buff *skb) | |
547 | { | |
548 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
549 | } | |
550 | ||
551 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) | |
552 | { | |
553 | sch->qstats.drops += count; | |
554 | } | |
555 | ||
556 | static inline void qdisc_qstats_drop(struct Qdisc *sch) | |
557 | { | |
558 | sch->qstats.drops++; | |
559 | } | |
560 | ||
b0ab6f92 JF |
561 | static inline void qdisc_qstats_drop_cpu(struct Qdisc *sch) |
562 | { | |
563 | struct gnet_stats_queue *qstats = this_cpu_ptr(sch->cpu_qstats); | |
564 | ||
565 | qstats->drops++; | |
566 | } | |
567 | ||
25331d6c JF |
568 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
569 | { | |
570 | sch->qstats.overlimits++; | |
571 | } | |
572 | ||
9972b25d TG |
573 | static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch, |
574 | struct sk_buff_head *list) | |
575 | { | |
576 | __skb_queue_tail(list, skb); | |
25331d6c | 577 | qdisc_qstats_backlog_inc(sch, skb); |
9972b25d TG |
578 | |
579 | return NET_XMIT_SUCCESS; | |
580 | } | |
581 | ||
582 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
583 | { | |
584 | return __qdisc_enqueue_tail(skb, sch, &sch->q); | |
585 | } | |
586 | ||
587 | static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch, | |
588 | struct sk_buff_head *list) | |
589 | { | |
590 | struct sk_buff *skb = __skb_dequeue(list); | |
591 | ||
9190b3b3 | 592 | if (likely(skb != NULL)) { |
25331d6c | 593 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
594 | qdisc_bstats_update(sch, skb); |
595 | } | |
9972b25d TG |
596 | |
597 | return skb; | |
598 | } | |
599 | ||
600 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
601 | { | |
602 | return __qdisc_dequeue_head(sch, &sch->q); | |
57dbb2d8 HPP |
603 | } |
604 | ||
605 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, | |
606 | struct sk_buff_head *list) | |
607 | { | |
9190b3b3 | 608 | struct sk_buff *skb = __skb_dequeue(list); |
57dbb2d8 HPP |
609 | |
610 | if (likely(skb != NULL)) { | |
611 | unsigned int len = qdisc_pkt_len(skb); | |
25331d6c | 612 | qdisc_qstats_backlog_dec(sch, skb); |
57dbb2d8 HPP |
613 | kfree_skb(skb); |
614 | return len; | |
615 | } | |
616 | ||
617 | return 0; | |
618 | } | |
619 | ||
620 | static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch) | |
621 | { | |
622 | return __qdisc_queue_drop_head(sch, &sch->q); | |
9972b25d TG |
623 | } |
624 | ||
625 | static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch, | |
626 | struct sk_buff_head *list) | |
627 | { | |
628 | struct sk_buff *skb = __skb_dequeue_tail(list); | |
629 | ||
630 | if (likely(skb != NULL)) | |
25331d6c | 631 | qdisc_qstats_backlog_dec(sch, skb); |
9972b25d TG |
632 | |
633 | return skb; | |
634 | } | |
635 | ||
636 | static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch) | |
637 | { | |
638 | return __qdisc_dequeue_tail(sch, &sch->q); | |
639 | } | |
640 | ||
48a8f519 PM |
641 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
642 | { | |
643 | return skb_peek(&sch->q); | |
644 | } | |
645 | ||
77be155c JP |
646 | /* generic pseudo peek method for non-work-conserving qdisc */ |
647 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
648 | { | |
649 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ | |
61c9eaf9 | 650 | if (!sch->gso_skb) { |
77be155c | 651 | sch->gso_skb = sch->dequeue(sch); |
61c9eaf9 JP |
652 | if (sch->gso_skb) |
653 | /* it's still part of the queue */ | |
654 | sch->q.qlen++; | |
655 | } | |
77be155c JP |
656 | |
657 | return sch->gso_skb; | |
658 | } | |
659 | ||
660 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
661 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
662 | { | |
663 | struct sk_buff *skb = sch->gso_skb; | |
664 | ||
61c9eaf9 | 665 | if (skb) { |
77be155c | 666 | sch->gso_skb = NULL; |
61c9eaf9 JP |
667 | sch->q.qlen--; |
668 | } else { | |
77be155c | 669 | skb = sch->dequeue(sch); |
61c9eaf9 | 670 | } |
77be155c JP |
671 | |
672 | return skb; | |
673 | } | |
674 | ||
9972b25d TG |
675 | static inline void __qdisc_reset_queue(struct Qdisc *sch, |
676 | struct sk_buff_head *list) | |
677 | { | |
678 | /* | |
679 | * We do not know the backlog in bytes of this list, it | |
680 | * is up to the caller to correct it | |
681 | */ | |
93245dd6 | 682 | __skb_queue_purge(list); |
9972b25d TG |
683 | } |
684 | ||
685 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
686 | { | |
687 | __qdisc_reset_queue(sch, &sch->q); | |
688 | sch->qstats.backlog = 0; | |
689 | } | |
690 | ||
691 | static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch, | |
692 | struct sk_buff_head *list) | |
693 | { | |
694 | struct sk_buff *skb = __qdisc_dequeue_tail(sch, list); | |
695 | ||
696 | if (likely(skb != NULL)) { | |
0abf77e5 | 697 | unsigned int len = qdisc_pkt_len(skb); |
9972b25d TG |
698 | kfree_skb(skb); |
699 | return len; | |
700 | } | |
701 | ||
702 | return 0; | |
703 | } | |
704 | ||
705 | static inline unsigned int qdisc_queue_drop(struct Qdisc *sch) | |
706 | { | |
707 | return __qdisc_queue_drop(sch, &sch->q); | |
708 | } | |
709 | ||
710 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) | |
711 | { | |
712 | kfree_skb(skb); | |
25331d6c | 713 | qdisc_qstats_drop(sch); |
9972b25d TG |
714 | |
715 | return NET_XMIT_DROP; | |
716 | } | |
717 | ||
718 | static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch) | |
719 | { | |
25331d6c | 720 | qdisc_qstats_drop(sch); |
9972b25d | 721 | |
c3bc7cff | 722 | #ifdef CONFIG_NET_CLS_ACT |
9972b25d TG |
723 | if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch)) |
724 | goto drop; | |
725 | ||
726 | return NET_XMIT_SUCCESS; | |
727 | ||
728 | drop: | |
729 | #endif | |
730 | kfree_skb(skb); | |
731 | return NET_XMIT_DROP; | |
732 | } | |
733 | ||
e9bef55d JDB |
734 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
735 | long it will take to send a packet given its size. | |
736 | */ | |
737 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
738 | { | |
e08b0998 JDB |
739 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
740 | if (slot < 0) | |
741 | slot = 0; | |
e9bef55d JDB |
742 | slot >>= rtab->rate.cell_log; |
743 | if (slot > 255) | |
a02cec21 | 744 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
745 | return rtab->data[slot]; |
746 | } | |
747 | ||
12da81d1 | 748 | #ifdef CONFIG_NET_CLS_ACT |
210d6de7 CG |
749 | static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask, |
750 | int action) | |
12da81d1 | 751 | { |
210d6de7 CG |
752 | struct sk_buff *n; |
753 | ||
17302107 | 754 | n = skb_clone(skb, gfp_mask); |
12da81d1 JHS |
755 | |
756 | if (n) { | |
757 | n->tc_verd = SET_TC_VERD(n->tc_verd, 0); | |
758 | n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd); | |
759 | n->tc_verd = CLR_TC_MUNGED(n->tc_verd); | |
12da81d1 JHS |
760 | } |
761 | return n; | |
762 | } | |
763 | #endif | |
764 | ||
292f1c7f | 765 | struct psched_ratecfg { |
130d3d68 | 766 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
767 | u32 mult; |
768 | u16 overhead; | |
8a8e3d84 | 769 | u8 linklayer; |
01cb71d2 | 770 | u8 shift; |
292f1c7f JP |
771 | }; |
772 | ||
773 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
774 | unsigned int len) | |
775 | { | |
8a8e3d84 JDB |
776 | len += r->overhead; |
777 | ||
778 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
779 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
780 | ||
781 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
782 | } |
783 | ||
5c15257f | 784 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
785 | const struct tc_ratespec *conf, |
786 | u64 rate64); | |
292f1c7f | 787 | |
01cb71d2 ED |
788 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
789 | const struct psched_ratecfg *r) | |
292f1c7f | 790 | { |
01cb71d2 | 791 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
792 | |
793 | /* legacy struct tc_ratespec has a 32bit @rate field | |
794 | * Qdisc using 64bit rate should add new attributes | |
795 | * in order to maintain compatibility. | |
796 | */ | |
797 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
798 | ||
01cb71d2 | 799 | res->overhead = r->overhead; |
8a8e3d84 | 800 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
801 | } |
802 | ||
1da177e4 | 803 | #endif |