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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __NET_SCHED_GENERIC_H |
3 | #define __NET_SCHED_GENERIC_H | |
4 | ||
1da177e4 LT |
5 | #include <linux/netdevice.h> |
6 | #include <linux/types.h> | |
7 | #include <linux/rcupdate.h> | |
1da177e4 LT |
8 | #include <linux/pkt_sched.h> |
9 | #include <linux/pkt_cls.h> | |
22e0f8b9 | 10 | #include <linux/percpu.h> |
5772e9a3 | 11 | #include <linux/dynamic_queue_limits.h> |
5bc17018 | 12 | #include <linux/list.h> |
7b936405 | 13 | #include <linux/refcount.h> |
7aa0045d | 14 | #include <linux/workqueue.h> |
c266f64d | 15 | #include <linux/mutex.h> |
4f8116c8 | 16 | #include <linux/rwsem.h> |
97394bef | 17 | #include <linux/atomic.h> |
59eb87cb | 18 | #include <linux/hashtable.h> |
1da177e4 | 19 | #include <net/gen_stats.h> |
be577ddc | 20 | #include <net/rtnetlink.h> |
a7323311 | 21 | #include <net/flow_offload.h> |
1da177e4 LT |
22 | |
23 | struct Qdisc_ops; | |
24 | struct qdisc_walker; | |
25 | struct tcf_walker; | |
26 | struct module; | |
d58e468b | 27 | struct bpf_flow_keys; |
1da177e4 | 28 | |
fd2c3ef7 | 29 | struct qdisc_rate_table { |
1da177e4 LT |
30 | struct tc_ratespec rate; |
31 | u32 data[256]; | |
32 | struct qdisc_rate_table *next; | |
33 | int refcnt; | |
34 | }; | |
35 | ||
fd2c3ef7 | 36 | enum qdisc_state_t { |
37437bb2 | 37 | __QDISC_STATE_SCHED, |
a9312ae8 | 38 | __QDISC_STATE_DEACTIVATED, |
e2627c8c DM |
39 | }; |
40 | ||
175f9c1b | 41 | struct qdisc_size_table { |
a2da570d | 42 | struct rcu_head rcu; |
175f9c1b JK |
43 | struct list_head list; |
44 | struct tc_sizespec szopts; | |
45 | int refcnt; | |
46 | u16 data[]; | |
47 | }; | |
48 | ||
48da34b7 FW |
49 | /* similar to sk_buff_head, but skb->prev pointer is undefined. */ |
50 | struct qdisc_skb_head { | |
51 | struct sk_buff *head; | |
52 | struct sk_buff *tail; | |
73eb628d | 53 | __u32 qlen; |
48da34b7 FW |
54 | spinlock_t lock; |
55 | }; | |
56 | ||
fd2c3ef7 | 57 | struct Qdisc { |
520ac30f ED |
58 | int (*enqueue)(struct sk_buff *skb, |
59 | struct Qdisc *sch, | |
60 | struct sk_buff **to_free); | |
61 | struct sk_buff * (*dequeue)(struct Qdisc *sch); | |
05bdd2f1 | 62 | unsigned int flags; |
b00355db | 63 | #define TCQ_F_BUILTIN 1 |
fd245a4a ED |
64 | #define TCQ_F_INGRESS 2 |
65 | #define TCQ_F_CAN_BYPASS 4 | |
66 | #define TCQ_F_MQROOT 8 | |
1abbe139 ED |
67 | #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for |
68 | * q->dev_queue : It can test | |
69 | * netif_xmit_frozen_or_stopped() before | |
70 | * dequeueing next packet. | |
71 | * Its true for MQ/MQPRIO slaves, or non | |
72 | * multiqueue device. | |
73 | */ | |
b00355db | 74 | #define TCQ_F_WARN_NONWC (1 << 16) |
22e0f8b9 | 75 | #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ |
4eaf3b84 ED |
76 | #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : |
77 | * qdisc_tree_decrease_qlen() should stop. | |
78 | */ | |
49b49971 | 79 | #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ |
6b3ba914 | 80 | #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */ |
7a4fa291 | 81 | #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */ |
45203a3b | 82 | u32 limit; |
05bdd2f1 | 83 | const struct Qdisc_ops *ops; |
a2da570d | 84 | struct qdisc_size_table __rcu *stab; |
59cc1f61 | 85 | struct hlist_node hash; |
1da177e4 LT |
86 | u32 handle; |
87 | u32 parent; | |
72b25a91 | 88 | |
5e140dfc | 89 | struct netdev_queue *dev_queue; |
5e140dfc | 90 | |
1c0d32fd | 91 | struct net_rate_estimator __rcu *rate_est; |
0d32ef8c ED |
92 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; |
93 | struct gnet_stats_queue __percpu *cpu_qstats; | |
e9be0e99 PA |
94 | int padded; |
95 | refcount_t refcnt; | |
0d32ef8c | 96 | |
5e140dfc ED |
97 | /* |
98 | * For performance sake on SMP, we put highly modified fields at the end | |
99 | */ | |
a53851e2 | 100 | struct sk_buff_head gso_skb ____cacheline_aligned_in_smp; |
48da34b7 | 101 | struct qdisc_skb_head q; |
0d32ef8c | 102 | struct gnet_stats_basic_packed bstats; |
f9eb8aea | 103 | seqcount_t running; |
0d32ef8c | 104 | struct gnet_stats_queue qstats; |
4d202a0d ED |
105 | unsigned long state; |
106 | struct Qdisc *next_sched; | |
70e57d5e | 107 | struct sk_buff_head skb_bad_txq; |
45203a3b ED |
108 | |
109 | spinlock_t busylock ____cacheline_aligned_in_smp; | |
96009c7d | 110 | spinlock_t seqlock; |
28cff537 PA |
111 | |
112 | /* for NOLOCK qdisc, true if there are no enqueued skbs */ | |
113 | bool empty; | |
3a7d0d07 | 114 | struct rcu_head rcu; |
1da177e4 LT |
115 | }; |
116 | ||
551143d8 ED |
117 | static inline void qdisc_refcount_inc(struct Qdisc *qdisc) |
118 | { | |
119 | if (qdisc->flags & TCQ_F_BUILTIN) | |
120 | return; | |
121 | refcount_inc(&qdisc->refcnt); | |
122 | } | |
123 | ||
9d7e82ce VB |
124 | /* Intended to be used by unlocked users, when concurrent qdisc release is |
125 | * possible. | |
126 | */ | |
127 | ||
128 | static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc) | |
129 | { | |
130 | if (qdisc->flags & TCQ_F_BUILTIN) | |
131 | return qdisc; | |
132 | if (refcount_inc_not_zero(&qdisc->refcnt)) | |
133 | return qdisc; | |
134 | return NULL; | |
135 | } | |
136 | ||
96009c7d | 137 | static inline bool qdisc_is_running(struct Qdisc *qdisc) |
bc135b23 | 138 | { |
32f7b44d | 139 | if (qdisc->flags & TCQ_F_NOLOCK) |
96009c7d | 140 | return spin_is_locked(&qdisc->seqlock); |
f9eb8aea | 141 | return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; |
bc135b23 ED |
142 | } |
143 | ||
9c01c9f1 PA |
144 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
145 | { | |
146 | return q->flags & TCQ_F_CPUSTATS; | |
147 | } | |
148 | ||
28cff537 PA |
149 | static inline bool qdisc_is_empty(const struct Qdisc *qdisc) |
150 | { | |
9c01c9f1 | 151 | if (qdisc_is_percpu_stats(qdisc)) |
90b2be27 ED |
152 | return READ_ONCE(qdisc->empty); |
153 | return !READ_ONCE(qdisc->q.qlen); | |
28cff537 PA |
154 | } |
155 | ||
bc135b23 ED |
156 | static inline bool qdisc_run_begin(struct Qdisc *qdisc) |
157 | { | |
32f7b44d | 158 | if (qdisc->flags & TCQ_F_NOLOCK) { |
96009c7d | 159 | if (!spin_trylock(&qdisc->seqlock)) |
32f7b44d | 160 | return false; |
90b2be27 | 161 | WRITE_ONCE(qdisc->empty, false); |
32f7b44d | 162 | } else if (qdisc_is_running(qdisc)) { |
fd245a4a | 163 | return false; |
32f7b44d | 164 | } |
52fbb290 ED |
165 | /* Variant of write_seqcount_begin() telling lockdep a trylock |
166 | * was attempted. | |
167 | */ | |
168 | raw_write_seqcount_begin(&qdisc->running); | |
169 | seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_); | |
fd245a4a | 170 | return true; |
bc135b23 ED |
171 | } |
172 | ||
173 | static inline void qdisc_run_end(struct Qdisc *qdisc) | |
174 | { | |
f9eb8aea | 175 | write_seqcount_end(&qdisc->running); |
32f7b44d | 176 | if (qdisc->flags & TCQ_F_NOLOCK) |
96009c7d | 177 | spin_unlock(&qdisc->seqlock); |
fd245a4a ED |
178 | } |
179 | ||
5772e9a3 JDB |
180 | static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) |
181 | { | |
182 | return qdisc->flags & TCQ_F_ONETXQUEUE; | |
183 | } | |
184 | ||
185 | static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) | |
186 | { | |
187 | #ifdef CONFIG_BQL | |
188 | /* Non-BQL migrated drivers will return 0, too. */ | |
189 | return dql_avail(&txq->dql); | |
190 | #else | |
191 | return 0; | |
192 | #endif | |
193 | } | |
194 | ||
fd2c3ef7 | 195 | struct Qdisc_class_ops { |
dfcd2a2b | 196 | unsigned int flags; |
1da177e4 | 197 | /* Child qdisc manipulation */ |
926e61b7 | 198 | struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); |
1da177e4 | 199 | int (*graft)(struct Qdisc *, unsigned long cl, |
653d6fd6 AA |
200 | struct Qdisc *, struct Qdisc **, |
201 | struct netlink_ext_ack *extack); | |
1da177e4 | 202 | struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); |
43effa1e | 203 | void (*qlen_notify)(struct Qdisc *, unsigned long); |
1da177e4 LT |
204 | |
205 | /* Class manipulation routines */ | |
143976ce | 206 | unsigned long (*find)(struct Qdisc *, u32 classid); |
1da177e4 | 207 | int (*change)(struct Qdisc *, u32, u32, |
793d81d6 AA |
208 | struct nlattr **, unsigned long *, |
209 | struct netlink_ext_ack *); | |
1da177e4 LT |
210 | int (*delete)(struct Qdisc *, unsigned long); |
211 | void (*walk)(struct Qdisc *, struct qdisc_walker * arg); | |
212 | ||
213 | /* Filter manipulation */ | |
0ac4bd68 | 214 | struct tcf_block * (*tcf_block)(struct Qdisc *sch, |
cbaacc4e AA |
215 | unsigned long arg, |
216 | struct netlink_ext_ack *extack); | |
1da177e4 LT |
217 | unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, |
218 | u32 classid); | |
219 | void (*unbind_tcf)(struct Qdisc *, unsigned long); | |
220 | ||
221 | /* rtnetlink specific */ | |
222 | int (*dump)(struct Qdisc *, unsigned long, | |
223 | struct sk_buff *skb, struct tcmsg*); | |
224 | int (*dump_stats)(struct Qdisc *, unsigned long, | |
225 | struct gnet_dump *); | |
226 | }; | |
227 | ||
dfcd2a2b VB |
228 | /* Qdisc_class_ops flag values */ |
229 | ||
230 | /* Implements API that doesn't require rtnl lock */ | |
231 | enum qdisc_class_ops_flags { | |
232 | QDISC_CLASS_OPS_DOIT_UNLOCKED = 1, | |
233 | }; | |
234 | ||
fd2c3ef7 | 235 | struct Qdisc_ops { |
1da177e4 | 236 | struct Qdisc_ops *next; |
20fea08b | 237 | const struct Qdisc_class_ops *cl_ops; |
1da177e4 LT |
238 | char id[IFNAMSIZ]; |
239 | int priv_size; | |
d59f5ffa | 240 | unsigned int static_flags; |
1da177e4 | 241 | |
520ac30f ED |
242 | int (*enqueue)(struct sk_buff *skb, |
243 | struct Qdisc *sch, | |
244 | struct sk_buff **to_free); | |
1da177e4 | 245 | struct sk_buff * (*dequeue)(struct Qdisc *); |
90d841fd | 246 | struct sk_buff * (*peek)(struct Qdisc *); |
1da177e4 | 247 | |
e63d7dfd AA |
248 | int (*init)(struct Qdisc *sch, struct nlattr *arg, |
249 | struct netlink_ext_ack *extack); | |
1da177e4 LT |
250 | void (*reset)(struct Qdisc *); |
251 | void (*destroy)(struct Qdisc *); | |
0ac4bd68 | 252 | int (*change)(struct Qdisc *sch, |
2030721c AA |
253 | struct nlattr *arg, |
254 | struct netlink_ext_ack *extack); | |
0ac4bd68 | 255 | void (*attach)(struct Qdisc *sch); |
48bfd55e | 256 | int (*change_tx_queue_len)(struct Qdisc *, unsigned int); |
1da177e4 LT |
257 | |
258 | int (*dump)(struct Qdisc *, struct sk_buff *); | |
259 | int (*dump_stats)(struct Qdisc *, struct gnet_dump *); | |
260 | ||
d47a6b0e JP |
261 | void (*ingress_block_set)(struct Qdisc *sch, |
262 | u32 block_index); | |
263 | void (*egress_block_set)(struct Qdisc *sch, | |
264 | u32 block_index); | |
265 | u32 (*ingress_block_get)(struct Qdisc *sch); | |
266 | u32 (*egress_block_get)(struct Qdisc *sch); | |
267 | ||
1da177e4 LT |
268 | struct module *owner; |
269 | }; | |
270 | ||
271 | ||
fd2c3ef7 | 272 | struct tcf_result { |
db50514f JP |
273 | union { |
274 | struct { | |
275 | unsigned long class; | |
276 | u32 classid; | |
277 | }; | |
278 | const struct tcf_proto *goto_tp; | |
cd11b164 | 279 | |
720f22fe | 280 | /* used in the skb_tc_reinsert function */ |
cd11b164 PA |
281 | struct { |
282 | bool ingress; | |
283 | struct gnet_stats_queue *qstats; | |
284 | }; | |
db50514f | 285 | }; |
1da177e4 LT |
286 | }; |
287 | ||
9f407f17 JP |
288 | struct tcf_chain; |
289 | ||
fd2c3ef7 | 290 | struct tcf_proto_ops { |
36272874 | 291 | struct list_head head; |
1da177e4 LT |
292 | char kind[IFNAMSIZ]; |
293 | ||
dc7f9f6e ED |
294 | int (*classify)(struct sk_buff *, |
295 | const struct tcf_proto *, | |
296 | struct tcf_result *); | |
1da177e4 | 297 | int (*init)(struct tcf_proto*); |
12db03b6 | 298 | void (*destroy)(struct tcf_proto *tp, bool rtnl_held, |
715df5ec | 299 | struct netlink_ext_ack *extack); |
1da177e4 | 300 | |
8113c095 | 301 | void* (*get)(struct tcf_proto*, u32 handle); |
7d5509fa | 302 | void (*put)(struct tcf_proto *tp, void *f); |
c1b52739 | 303 | int (*change)(struct net *net, struct sk_buff *, |
af4c6641 | 304 | struct tcf_proto*, unsigned long, |
add93b61 | 305 | u32 handle, struct nlattr **, |
12db03b6 | 306 | void **, bool, bool, |
7306db38 | 307 | struct netlink_ext_ack *); |
8865fdd4 | 308 | int (*delete)(struct tcf_proto *tp, void *arg, |
12db03b6 | 309 | bool *last, bool rtnl_held, |
571acf21 | 310 | struct netlink_ext_ack *); |
a5b72a08 | 311 | bool (*delete_empty)(struct tcf_proto *tp); |
12db03b6 VB |
312 | void (*walk)(struct tcf_proto *tp, |
313 | struct tcf_walker *arg, bool rtnl_held); | |
e56185c7 | 314 | int (*reoffload)(struct tcf_proto *tp, bool add, |
a7323311 | 315 | flow_setup_cb_t *cb, void *cb_priv, |
e56185c7 | 316 | struct netlink_ext_ack *extack); |
a449a3e7 VB |
317 | void (*hw_add)(struct tcf_proto *tp, |
318 | void *type_data); | |
319 | void (*hw_del)(struct tcf_proto *tp, | |
320 | void *type_data); | |
2e24cd75 CW |
321 | void (*bind_class)(void *, u32, unsigned long, |
322 | void *, unsigned long); | |
9f407f17 JP |
323 | void * (*tmplt_create)(struct net *net, |
324 | struct tcf_chain *chain, | |
325 | struct nlattr **tca, | |
326 | struct netlink_ext_ack *extack); | |
327 | void (*tmplt_destroy)(void *tmplt_priv); | |
1da177e4 LT |
328 | |
329 | /* rtnetlink specific */ | |
8113c095 | 330 | int (*dump)(struct net*, struct tcf_proto*, void *, |
12db03b6 VB |
331 | struct sk_buff *skb, struct tcmsg*, |
332 | bool); | |
f8ab1807 VB |
333 | int (*terse_dump)(struct net *net, |
334 | struct tcf_proto *tp, void *fh, | |
335 | struct sk_buff *skb, | |
336 | struct tcmsg *t, bool rtnl_held); | |
9f407f17 JP |
337 | int (*tmplt_dump)(struct sk_buff *skb, |
338 | struct net *net, | |
339 | void *tmplt_priv); | |
1da177e4 LT |
340 | |
341 | struct module *owner; | |
12db03b6 VB |
342 | int flags; |
343 | }; | |
344 | ||
a5b72a08 DC |
345 | /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags |
346 | * are expected to implement tcf_proto_ops->delete_empty(), otherwise race | |
347 | * conditions can occur when filters are inserted/deleted simultaneously. | |
348 | */ | |
12db03b6 VB |
349 | enum tcf_proto_ops_flags { |
350 | TCF_PROTO_OPS_DOIT_UNLOCKED = 1, | |
1da177e4 LT |
351 | }; |
352 | ||
fd2c3ef7 | 353 | struct tcf_proto { |
1da177e4 | 354 | /* Fast access part */ |
25d8c0d5 JF |
355 | struct tcf_proto __rcu *next; |
356 | void __rcu *root; | |
7fd4b288 PA |
357 | |
358 | /* called under RCU BH lock*/ | |
dc7f9f6e ED |
359 | int (*classify)(struct sk_buff *, |
360 | const struct tcf_proto *, | |
361 | struct tcf_result *); | |
66c6f529 | 362 | __be16 protocol; |
1da177e4 LT |
363 | |
364 | /* All the rest */ | |
365 | u32 prio; | |
1da177e4 | 366 | void *data; |
dc7f9f6e | 367 | const struct tcf_proto_ops *ops; |
5bc17018 | 368 | struct tcf_chain *chain; |
8b64678e VB |
369 | /* Lock protects tcf_proto shared state and can be used by unlocked |
370 | * classifiers to protect their private data. | |
371 | */ | |
372 | spinlock_t lock; | |
373 | bool deleting; | |
4dbfa766 | 374 | refcount_t refcnt; |
25d8c0d5 | 375 | struct rcu_head rcu; |
59eb87cb | 376 | struct hlist_node destroy_ht_node; |
1da177e4 LT |
377 | }; |
378 | ||
175f9c1b | 379 | struct qdisc_skb_cb { |
089b19a9 SF |
380 | struct { |
381 | unsigned int pkt_len; | |
382 | u16 slave_dev_queue_mapping; | |
383 | u16 tc_classid; | |
d58e468b | 384 | }; |
25711786 ED |
385 | #define QDISC_CB_PRIV_LEN 20 |
386 | unsigned char data[QDISC_CB_PRIV_LEN]; | |
038ebb1a | 387 | u16 mru; |
175f9c1b JK |
388 | }; |
389 | ||
c7eb7d72 JP |
390 | typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv); |
391 | ||
2190d1d0 | 392 | struct tcf_chain { |
ed76f5ed VB |
393 | /* Protects filter_chain. */ |
394 | struct mutex filter_chain_lock; | |
2190d1d0 | 395 | struct tcf_proto __rcu *filter_chain; |
5bc17018 JP |
396 | struct list_head list; |
397 | struct tcf_block *block; | |
398 | u32 index; /* chain index */ | |
399 | unsigned int refcnt; | |
1f3ed383 | 400 | unsigned int action_refcnt; |
32a4f5ec | 401 | bool explicitly_created; |
726d0612 | 402 | bool flushing; |
9f407f17 JP |
403 | const struct tcf_proto_ops *tmplt_ops; |
404 | void *tmplt_priv; | |
ee3bbfe8 | 405 | struct rcu_head rcu; |
6529eaba JP |
406 | }; |
407 | ||
2190d1d0 | 408 | struct tcf_block { |
c266f64d VB |
409 | /* Lock protects tcf_block and lifetime-management data of chains |
410 | * attached to the block (refcnt, action_refcnt, explicitly_created). | |
411 | */ | |
412 | struct mutex lock; | |
5bc17018 | 413 | struct list_head chain_list; |
48617387 | 414 | u32 index; /* block index for shared blocks */ |
a7df4870 | 415 | u32 classid; /* which class this block belongs to */ |
cfebd7e2 | 416 | refcount_t refcnt; |
855319be | 417 | struct net *net; |
69d78ef2 | 418 | struct Qdisc *q; |
4f8116c8 | 419 | struct rw_semaphore cb_lock; /* protects cb_list and offload counters */ |
14bfb13f | 420 | struct flow_block flow_block; |
f36fe1c4 JP |
421 | struct list_head owner_list; |
422 | bool keep_dst; | |
97394bef | 423 | atomic_t offloadcnt; /* Number of oddloaded filters */ |
caa72601 | 424 | unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */ |
c9f14470 | 425 | unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */ |
f71e0ca4 JP |
426 | struct { |
427 | struct tcf_chain *chain; | |
428 | struct list_head filter_chain_list; | |
429 | } chain0; | |
0607e439 | 430 | struct rcu_head rcu; |
59eb87cb JH |
431 | DECLARE_HASHTABLE(proto_destroy_ht, 7); |
432 | struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */ | |
2190d1d0 JP |
433 | }; |
434 | ||
ed76f5ed VB |
435 | #ifdef CONFIG_PROVE_LOCKING |
436 | static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain) | |
437 | { | |
438 | return lockdep_is_held(&chain->filter_chain_lock); | |
439 | } | |
8b64678e VB |
440 | |
441 | static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) | |
442 | { | |
443 | return lockdep_is_held(&tp->lock); | |
444 | } | |
ed76f5ed VB |
445 | #else |
446 | static inline bool lockdep_tcf_chain_is_locked(struct tcf_block *chain) | |
447 | { | |
448 | return true; | |
449 | } | |
8b64678e VB |
450 | |
451 | static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) | |
452 | { | |
453 | return true; | |
454 | } | |
ed76f5ed VB |
455 | #endif /* #ifdef CONFIG_PROVE_LOCKING */ |
456 | ||
457 | #define tcf_chain_dereference(p, chain) \ | |
458 | rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain)) | |
459 | ||
8b64678e VB |
460 | #define tcf_proto_dereference(p, tp) \ |
461 | rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp)) | |
462 | ||
16bda13d DM |
463 | static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
464 | { | |
465 | struct qdisc_skb_cb *qcb; | |
5ee31c68 | 466 | |
038ebb1a | 467 | BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb)); |
16bda13d DM |
468 | BUILD_BUG_ON(sizeof(qcb->data) < sz); |
469 | } | |
470 | ||
73eb628d PA |
471 | static inline int qdisc_qlen_cpu(const struct Qdisc *q) |
472 | { | |
473 | return this_cpu_ptr(q->cpu_qstats)->qlen; | |
474 | } | |
475 | ||
05bdd2f1 | 476 | static inline int qdisc_qlen(const struct Qdisc *q) |
bbd8a0d3 KK |
477 | { |
478 | return q->q.qlen; | |
479 | } | |
480 | ||
73eb628d | 481 | static inline int qdisc_qlen_sum(const struct Qdisc *q) |
7e66016f | 482 | { |
73eb628d PA |
483 | __u32 qlen = q->qstats.qlen; |
484 | int i; | |
7e66016f | 485 | |
73eb628d PA |
486 | if (qdisc_is_percpu_stats(q)) { |
487 | for_each_possible_cpu(i) | |
488 | qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen; | |
489 | } else { | |
6172abc1 | 490 | qlen += q->q.qlen; |
73eb628d | 491 | } |
7e66016f JF |
492 | |
493 | return qlen; | |
494 | } | |
495 | ||
bfe0d029 | 496 | static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
175f9c1b JK |
497 | { |
498 | return (struct qdisc_skb_cb *)skb->cb; | |
499 | } | |
500 | ||
83874000 DM |
501 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
502 | { | |
503 | return &qdisc->q.lock; | |
504 | } | |
505 | ||
05bdd2f1 | 506 | static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
7698b4fc | 507 | { |
46e5da40 JF |
508 | struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
509 | ||
510 | return q; | |
7698b4fc DM |
511 | } |
512 | ||
159d2c7d ED |
513 | static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc) |
514 | { | |
515 | return rcu_dereference_bh(qdisc->dev_queue->qdisc); | |
516 | } | |
517 | ||
05bdd2f1 | 518 | static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
2540e051 JP |
519 | { |
520 | return qdisc->dev_queue->qdisc_sleeping; | |
521 | } | |
522 | ||
7e43f112 DM |
523 | /* The qdisc root lock is a mechanism by which to top level |
524 | * of a qdisc tree can be locked from any qdisc node in the | |
525 | * forest. This allows changing the configuration of some | |
526 | * aspect of the qdisc tree while blocking out asynchronous | |
527 | * qdisc access in the packet processing paths. | |
528 | * | |
529 | * It is only legal to do this when the root will not change | |
530 | * on us. Otherwise we'll potentially lock the wrong qdisc | |
531 | * root. This is enforced by holding the RTNL semaphore, which | |
532 | * all users of this lock accessor must do. | |
533 | */ | |
05bdd2f1 | 534 | static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) |
7698b4fc DM |
535 | { |
536 | struct Qdisc *root = qdisc_root(qdisc); | |
537 | ||
7e43f112 | 538 | ASSERT_RTNL(); |
83874000 | 539 | return qdisc_lock(root); |
7698b4fc DM |
540 | } |
541 | ||
05bdd2f1 | 542 | static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
f6f9b93f JP |
543 | { |
544 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
545 | ||
546 | ASSERT_RTNL(); | |
547 | return qdisc_lock(root); | |
548 | } | |
549 | ||
edb09eb1 ED |
550 | static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) |
551 | { | |
552 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
553 | ||
554 | ASSERT_RTNL(); | |
555 | return &root->running; | |
556 | } | |
557 | ||
05bdd2f1 | 558 | static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) |
5ce2d488 DM |
559 | { |
560 | return qdisc->dev_queue->dev; | |
561 | } | |
1da177e4 | 562 | |
05bdd2f1 | 563 | static inline void sch_tree_lock(const struct Qdisc *q) |
78a5b30b | 564 | { |
fe439dd0 | 565 | spin_lock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
566 | } |
567 | ||
05bdd2f1 | 568 | static inline void sch_tree_unlock(const struct Qdisc *q) |
78a5b30b | 569 | { |
fe439dd0 | 570 | spin_unlock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
571 | } |
572 | ||
e41a33e6 TG |
573 | extern struct Qdisc noop_qdisc; |
574 | extern struct Qdisc_ops noop_qdisc_ops; | |
6ec1c69a DM |
575 | extern struct Qdisc_ops pfifo_fast_ops; |
576 | extern struct Qdisc_ops mq_qdisc_ops; | |
d66d6c31 | 577 | extern struct Qdisc_ops noqueue_qdisc_ops; |
6da7c8fc | 578 | extern const struct Qdisc_ops *default_qdisc_ops; |
1f27cde3 ED |
579 | static inline const struct Qdisc_ops * |
580 | get_default_qdisc_ops(const struct net_device *dev, int ntx) | |
581 | { | |
582 | return ntx < dev->real_num_tx_queues ? | |
583 | default_qdisc_ops : &pfifo_fast_ops; | |
584 | } | |
e41a33e6 | 585 | |
fd2c3ef7 | 586 | struct Qdisc_class_common { |
6fe1c7a5 PM |
587 | u32 classid; |
588 | struct hlist_node hnode; | |
589 | }; | |
590 | ||
fd2c3ef7 | 591 | struct Qdisc_class_hash { |
6fe1c7a5 PM |
592 | struct hlist_head *hash; |
593 | unsigned int hashsize; | |
594 | unsigned int hashmask; | |
595 | unsigned int hashelems; | |
596 | }; | |
597 | ||
598 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
599 | { | |
600 | id ^= id >> 8; | |
601 | id ^= id >> 4; | |
602 | return id & mask; | |
603 | } | |
604 | ||
605 | static inline struct Qdisc_class_common * | |
05bdd2f1 | 606 | qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
6fe1c7a5 PM |
607 | { |
608 | struct Qdisc_class_common *cl; | |
6fe1c7a5 PM |
609 | unsigned int h; |
610 | ||
7d3f0cd4 GF |
611 | if (!id) |
612 | return NULL; | |
613 | ||
6fe1c7a5 | 614 | h = qdisc_class_hash(id, hash->hashmask); |
b67bfe0d | 615 | hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
6fe1c7a5 PM |
616 | if (cl->classid == id) |
617 | return cl; | |
618 | } | |
619 | return NULL; | |
620 | } | |
621 | ||
384c181e AN |
622 | static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) |
623 | { | |
624 | u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; | |
625 | ||
626 | return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; | |
627 | } | |
628 | ||
5c15257f JP |
629 | int qdisc_class_hash_init(struct Qdisc_class_hash *); |
630 | void qdisc_class_hash_insert(struct Qdisc_class_hash *, | |
631 | struct Qdisc_class_common *); | |
632 | void qdisc_class_hash_remove(struct Qdisc_class_hash *, | |
633 | struct Qdisc_class_common *); | |
634 | void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
635 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
636 | ||
48bfd55e | 637 | int dev_qdisc_change_tx_queue_len(struct net_device *dev); |
5c15257f JP |
638 | void dev_init_scheduler(struct net_device *dev); |
639 | void dev_shutdown(struct net_device *dev); | |
640 | void dev_activate(struct net_device *dev); | |
641 | void dev_deactivate(struct net_device *dev); | |
642 | void dev_deactivate_many(struct list_head *head); | |
643 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
644 | struct Qdisc *qdisc); | |
645 | void qdisc_reset(struct Qdisc *qdisc); | |
86bd446b | 646 | void qdisc_put(struct Qdisc *qdisc); |
3a7d0d07 | 647 | void qdisc_put_unlocked(struct Qdisc *qdisc); |
5f2939d9 | 648 | void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len); |
b592843c JK |
649 | #ifdef CONFIG_NET_SCHED |
650 | int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, | |
651 | void *type_data); | |
bfaee911 JK |
652 | void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, |
653 | struct Qdisc *new, struct Qdisc *old, | |
654 | enum tc_setup_type type, void *type_data, | |
655 | struct netlink_ext_ack *extack); | |
b592843c JK |
656 | #else |
657 | static inline int | |
658 | qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, | |
659 | void *type_data) | |
660 | { | |
661 | q->flags &= ~TCQ_F_OFFLOADED; | |
662 | return 0; | |
663 | } | |
bfaee911 JK |
664 | |
665 | static inline void | |
666 | qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, | |
667 | struct Qdisc *new, struct Qdisc *old, | |
668 | enum tc_setup_type type, void *type_data, | |
669 | struct netlink_ext_ack *extack) | |
670 | { | |
671 | } | |
b592843c | 672 | #endif |
5c15257f | 673 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d0bd684d AA |
674 | const struct Qdisc_ops *ops, |
675 | struct netlink_ext_ack *extack); | |
81d947e2 | 676 | void qdisc_free(struct Qdisc *qdisc); |
5c15257f | 677 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
a38a9882 AA |
678 | const struct Qdisc_ops *ops, u32 parentid, |
679 | struct netlink_ext_ack *extack); | |
5c15257f JP |
680 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
681 | const struct qdisc_size_table *stab); | |
27b29f63 | 682 | int skb_do_redirect(struct sk_buff *); |
1da177e4 | 683 | |
fdc5432a DB |
684 | static inline bool skb_at_tc_ingress(const struct sk_buff *skb) |
685 | { | |
686 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 687 | return skb->tc_at_ingress; |
fdc5432a DB |
688 | #else |
689 | return false; | |
690 | #endif | |
691 | } | |
692 | ||
e7246e12 WB |
693 | static inline bool skb_skip_tc_classify(struct sk_buff *skb) |
694 | { | |
695 | #ifdef CONFIG_NET_CLS_ACT | |
696 | if (skb->tc_skip_classify) { | |
697 | skb->tc_skip_classify = 0; | |
698 | return true; | |
699 | } | |
700 | #endif | |
701 | return false; | |
702 | } | |
703 | ||
3a053b1a | 704 | /* Reset all TX qdiscs greater than index of a device. */ |
f0796d5c | 705 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) |
5aa70995 | 706 | { |
4ef6acff JF |
707 | struct Qdisc *qdisc; |
708 | ||
f0796d5c | 709 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 710 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
711 | if (qdisc) { |
712 | spin_lock_bh(qdisc_lock(qdisc)); | |
713 | qdisc_reset(qdisc); | |
714 | spin_unlock_bh(qdisc_lock(qdisc)); | |
715 | } | |
716 | } | |
5aa70995 DM |
717 | } |
718 | ||
3e745dd6 DM |
719 | /* Are all TX queues of the device empty? */ |
720 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
721 | { | |
e8a0464c | 722 | unsigned int i; |
46e5da40 JF |
723 | |
724 | rcu_read_lock(); | |
e8a0464c DM |
725 | for (i = 0; i < dev->num_tx_queues; i++) { |
726 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 727 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 728 | |
1f5e6fdd | 729 | if (!qdisc_is_empty(q)) { |
46e5da40 | 730 | rcu_read_unlock(); |
e8a0464c | 731 | return false; |
46e5da40 | 732 | } |
e8a0464c | 733 | } |
46e5da40 | 734 | rcu_read_unlock(); |
e8a0464c | 735 | return true; |
3e745dd6 DM |
736 | } |
737 | ||
6fa9864b | 738 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 739 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 740 | { |
e8a0464c | 741 | unsigned int i; |
46e5da40 | 742 | |
e8a0464c DM |
743 | for (i = 0; i < dev->num_tx_queues; i++) { |
744 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 745 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
746 | return true; |
747 | } | |
748 | return false; | |
6fa9864b DM |
749 | } |
750 | ||
e8a0464c | 751 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
752 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
753 | { | |
e8a0464c | 754 | unsigned int i; |
46e5da40 | 755 | |
e8a0464c DM |
756 | for (i = 0; i < dev->num_tx_queues; i++) { |
757 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 758 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
e8a0464c DM |
759 | return false; |
760 | } | |
761 | return true; | |
05297949 DM |
762 | } |
763 | ||
bfe0d029 | 764 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 765 | { |
175f9c1b | 766 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
767 | } |
768 | ||
c27f339a | 769 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
770 | enum net_xmit_qdisc_t { |
771 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 772 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
773 | }; |
774 | ||
c27f339a | 775 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 776 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
777 | #else |
778 | #define net_xmit_drop_count(e) (1) | |
779 | #endif | |
780 | ||
a2da570d ED |
781 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
782 | const struct Qdisc *sch) | |
5f86173b | 783 | { |
3a682fbd | 784 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
785 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
786 | ||
787 | if (stab) | |
788 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 789 | #endif |
a2da570d ED |
790 | } |
791 | ||
ac5c66f2 | 792 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
520ac30f | 793 | struct sk_buff **to_free) |
a2da570d ED |
794 | { |
795 | qdisc_calculate_pkt_len(skb, sch); | |
ac5c66f2 | 796 | return sch->enqueue(skb, sch, to_free); |
5f86173b JK |
797 | } |
798 | ||
38040702 AV |
799 | static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, |
800 | __u64 bytes, __u32 packets) | |
801 | { | |
802 | bstats->bytes += bytes; | |
803 | bstats->packets += packets; | |
804 | } | |
805 | ||
bfe0d029 ED |
806 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, |
807 | const struct sk_buff *skb) | |
808 | { | |
38040702 AV |
809 | _bstats_update(bstats, |
810 | qdisc_pkt_len(skb), | |
811 | skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); | |
812 | } | |
813 | ||
814 | static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, | |
815 | __u64 bytes, __u32 packets) | |
816 | { | |
817 | u64_stats_update_begin(&bstats->syncp); | |
818 | _bstats_update(&bstats->bstats, bytes, packets); | |
819 | u64_stats_update_end(&bstats->syncp); | |
bfe0d029 ED |
820 | } |
821 | ||
24ea591d ED |
822 | static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, |
823 | const struct sk_buff *skb) | |
22e0f8b9 | 824 | { |
22e0f8b9 JF |
825 | u64_stats_update_begin(&bstats->syncp); |
826 | bstats_update(&bstats->bstats, skb); | |
827 | u64_stats_update_end(&bstats->syncp); | |
828 | } | |
829 | ||
24ea591d ED |
830 | static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
831 | const struct sk_buff *skb) | |
832 | { | |
833 | bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); | |
834 | } | |
835 | ||
bfe0d029 ED |
836 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
837 | const struct sk_buff *skb) | |
bbd8a0d3 | 838 | { |
bfe0d029 | 839 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
840 | } |
841 | ||
25331d6c JF |
842 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
843 | const struct sk_buff *skb) | |
844 | { | |
845 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
846 | } | |
847 | ||
40bd0362 JF |
848 | static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch, |
849 | const struct sk_buff *skb) | |
850 | { | |
851 | this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); | |
852 | } | |
853 | ||
25331d6c JF |
854 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, |
855 | const struct sk_buff *skb) | |
856 | { | |
857 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
858 | } | |
859 | ||
40bd0362 JF |
860 | static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch, |
861 | const struct sk_buff *skb) | |
862 | { | |
863 | this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); | |
864 | } | |
865 | ||
73eb628d | 866 | static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch) |
40bd0362 | 867 | { |
73eb628d | 868 | this_cpu_inc(sch->cpu_qstats->qlen); |
40bd0362 JF |
869 | } |
870 | ||
73eb628d | 871 | static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch) |
40bd0362 | 872 | { |
73eb628d | 873 | this_cpu_dec(sch->cpu_qstats->qlen); |
40bd0362 JF |
874 | } |
875 | ||
876 | static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) | |
877 | { | |
878 | this_cpu_inc(sch->cpu_qstats->requeues); | |
879 | } | |
880 | ||
25331d6c JF |
881 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) |
882 | { | |
883 | sch->qstats.drops += count; | |
884 | } | |
885 | ||
24ea591d | 886 | static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
25331d6c | 887 | { |
24ea591d | 888 | qstats->drops++; |
25331d6c JF |
889 | } |
890 | ||
24ea591d | 891 | static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
b0ab6f92 | 892 | { |
24ea591d ED |
893 | qstats->overlimits++; |
894 | } | |
b0ab6f92 | 895 | |
24ea591d ED |
896 | static inline void qdisc_qstats_drop(struct Qdisc *sch) |
897 | { | |
898 | qstats_drop_inc(&sch->qstats); | |
899 | } | |
900 | ||
901 | static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) | |
902 | { | |
eb60a8dd | 903 | this_cpu_inc(sch->cpu_qstats->drops); |
b0ab6f92 JF |
904 | } |
905 | ||
25331d6c JF |
906 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
907 | { | |
908 | sch->qstats.overlimits++; | |
909 | } | |
910 | ||
5dd431b6 PA |
911 | static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch) |
912 | { | |
913 | __u32 qlen = qdisc_qlen_sum(sch); | |
914 | ||
915 | return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen); | |
916 | } | |
917 | ||
918 | static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen, | |
919 | __u32 *backlog) | |
920 | { | |
921 | struct gnet_stats_queue qstats = { 0 }; | |
922 | __u32 len = qdisc_qlen_sum(sch); | |
923 | ||
924 | __gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len); | |
925 | *qlen = qstats.qlen; | |
926 | *backlog = qstats.backlog; | |
927 | } | |
928 | ||
e5f0e8f8 PA |
929 | static inline void qdisc_tree_flush_backlog(struct Qdisc *sch) |
930 | { | |
931 | __u32 qlen, backlog; | |
932 | ||
933 | qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); | |
934 | qdisc_tree_reduce_backlog(sch, qlen, backlog); | |
935 | } | |
936 | ||
937 | static inline void qdisc_purge_queue(struct Qdisc *sch) | |
938 | { | |
939 | __u32 qlen, backlog; | |
940 | ||
941 | qdisc_qstats_qlen_backlog(sch, &qlen, &backlog); | |
942 | qdisc_reset(sch); | |
943 | qdisc_tree_reduce_backlog(sch, qlen, backlog); | |
944 | } | |
945 | ||
48da34b7 FW |
946 | static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh) |
947 | { | |
948 | qh->head = NULL; | |
949 | qh->tail = NULL; | |
950 | qh->qlen = 0; | |
951 | } | |
952 | ||
aea890b8 DM |
953 | static inline void __qdisc_enqueue_tail(struct sk_buff *skb, |
954 | struct qdisc_skb_head *qh) | |
9972b25d | 955 | { |
48da34b7 FW |
956 | struct sk_buff *last = qh->tail; |
957 | ||
958 | if (last) { | |
959 | skb->next = NULL; | |
960 | last->next = skb; | |
961 | qh->tail = skb; | |
962 | } else { | |
963 | qh->tail = skb; | |
964 | qh->head = skb; | |
965 | } | |
966 | qh->qlen++; | |
9972b25d TG |
967 | } |
968 | ||
969 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
970 | { | |
aea890b8 DM |
971 | __qdisc_enqueue_tail(skb, &sch->q); |
972 | qdisc_qstats_backlog_inc(sch, skb); | |
973 | return NET_XMIT_SUCCESS; | |
9972b25d TG |
974 | } |
975 | ||
59697730 DM |
976 | static inline void __qdisc_enqueue_head(struct sk_buff *skb, |
977 | struct qdisc_skb_head *qh) | |
978 | { | |
979 | skb->next = qh->head; | |
980 | ||
981 | if (!qh->head) | |
982 | qh->tail = skb; | |
983 | qh->head = skb; | |
984 | qh->qlen++; | |
985 | } | |
986 | ||
48da34b7 | 987 | static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) |
9972b25d | 988 | { |
48da34b7 FW |
989 | struct sk_buff *skb = qh->head; |
990 | ||
991 | if (likely(skb != NULL)) { | |
992 | qh->head = skb->next; | |
993 | qh->qlen--; | |
994 | if (qh->head == NULL) | |
995 | qh->tail = NULL; | |
996 | skb->next = NULL; | |
997 | } | |
9972b25d | 998 | |
ec323368 FW |
999 | return skb; |
1000 | } | |
1001 | ||
1002 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
1003 | { | |
1004 | struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); | |
1005 | ||
9190b3b3 | 1006 | if (likely(skb != NULL)) { |
25331d6c | 1007 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
1008 | qdisc_bstats_update(sch, skb); |
1009 | } | |
9972b25d TG |
1010 | |
1011 | return skb; | |
1012 | } | |
1013 | ||
520ac30f ED |
1014 | /* Instead of calling kfree_skb() while root qdisc lock is held, |
1015 | * queue the skb for future freeing at end of __dev_xmit_skb() | |
1016 | */ | |
1017 | static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) | |
1018 | { | |
1019 | skb->next = *to_free; | |
1020 | *to_free = skb; | |
1021 | } | |
1022 | ||
35d889d1 AK |
1023 | static inline void __qdisc_drop_all(struct sk_buff *skb, |
1024 | struct sk_buff **to_free) | |
1025 | { | |
1026 | if (skb->prev) | |
1027 | skb->prev->next = *to_free; | |
1028 | else | |
1029 | skb->next = *to_free; | |
1030 | *to_free = skb; | |
1031 | } | |
1032 | ||
57dbb2d8 | 1033 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, |
48da34b7 | 1034 | struct qdisc_skb_head *qh, |
520ac30f | 1035 | struct sk_buff **to_free) |
57dbb2d8 | 1036 | { |
48da34b7 | 1037 | struct sk_buff *skb = __qdisc_dequeue_head(qh); |
57dbb2d8 HPP |
1038 | |
1039 | if (likely(skb != NULL)) { | |
1040 | unsigned int len = qdisc_pkt_len(skb); | |
520ac30f | 1041 | |
25331d6c | 1042 | qdisc_qstats_backlog_dec(sch, skb); |
520ac30f | 1043 | __qdisc_drop(skb, to_free); |
57dbb2d8 HPP |
1044 | return len; |
1045 | } | |
1046 | ||
1047 | return 0; | |
1048 | } | |
1049 | ||
48a8f519 PM |
1050 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
1051 | { | |
48da34b7 FW |
1052 | const struct qdisc_skb_head *qh = &sch->q; |
1053 | ||
1054 | return qh->head; | |
48a8f519 PM |
1055 | } |
1056 | ||
77be155c JP |
1057 | /* generic pseudo peek method for non-work-conserving qdisc */ |
1058 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
1059 | { | |
a53851e2 JF |
1060 | struct sk_buff *skb = skb_peek(&sch->gso_skb); |
1061 | ||
77be155c | 1062 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ |
a53851e2 JF |
1063 | if (!skb) { |
1064 | skb = sch->dequeue(sch); | |
1065 | ||
1066 | if (skb) { | |
1067 | __skb_queue_head(&sch->gso_skb, skb); | |
61c9eaf9 | 1068 | /* it's still part of the queue */ |
a53851e2 | 1069 | qdisc_qstats_backlog_inc(sch, skb); |
61c9eaf9 | 1070 | sch->q.qlen++; |
a27758ff | 1071 | } |
61c9eaf9 | 1072 | } |
77be155c | 1073 | |
a53851e2 | 1074 | return skb; |
77be155c JP |
1075 | } |
1076 | ||
8a53e616 PA |
1077 | static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch, |
1078 | struct sk_buff *skb) | |
1079 | { | |
1080 | if (qdisc_is_percpu_stats(sch)) { | |
1081 | qdisc_qstats_cpu_backlog_dec(sch, skb); | |
1082 | qdisc_bstats_cpu_update(sch, skb); | |
73eb628d | 1083 | qdisc_qstats_cpu_qlen_dec(sch); |
8a53e616 PA |
1084 | } else { |
1085 | qdisc_qstats_backlog_dec(sch, skb); | |
1086 | qdisc_bstats_update(sch, skb); | |
1087 | sch->q.qlen--; | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch, | |
1092 | unsigned int pkt_len) | |
1093 | { | |
1094 | if (qdisc_is_percpu_stats(sch)) { | |
73eb628d | 1095 | qdisc_qstats_cpu_qlen_inc(sch); |
8a53e616 PA |
1096 | this_cpu_add(sch->cpu_qstats->backlog, pkt_len); |
1097 | } else { | |
1098 | sch->qstats.backlog += pkt_len; | |
1099 | sch->q.qlen++; | |
1100 | } | |
1101 | } | |
1102 | ||
77be155c JP |
1103 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ |
1104 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
1105 | { | |
a53851e2 | 1106 | struct sk_buff *skb = skb_peek(&sch->gso_skb); |
77be155c | 1107 | |
61c9eaf9 | 1108 | if (skb) { |
a53851e2 | 1109 | skb = __skb_dequeue(&sch->gso_skb); |
9c01c9f1 PA |
1110 | if (qdisc_is_percpu_stats(sch)) { |
1111 | qdisc_qstats_cpu_backlog_dec(sch, skb); | |
73eb628d | 1112 | qdisc_qstats_cpu_qlen_dec(sch); |
9c01c9f1 PA |
1113 | } else { |
1114 | qdisc_qstats_backlog_dec(sch, skb); | |
1115 | sch->q.qlen--; | |
1116 | } | |
61c9eaf9 | 1117 | } else { |
77be155c | 1118 | skb = sch->dequeue(sch); |
61c9eaf9 | 1119 | } |
77be155c JP |
1120 | |
1121 | return skb; | |
1122 | } | |
1123 | ||
48da34b7 | 1124 | static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) |
9972b25d TG |
1125 | { |
1126 | /* | |
1127 | * We do not know the backlog in bytes of this list, it | |
1128 | * is up to the caller to correct it | |
1129 | */ | |
48da34b7 FW |
1130 | ASSERT_RTNL(); |
1131 | if (qh->qlen) { | |
1132 | rtnl_kfree_skbs(qh->head, qh->tail); | |
1133 | ||
1134 | qh->head = NULL; | |
1135 | qh->tail = NULL; | |
1136 | qh->qlen = 0; | |
1b5c5493 | 1137 | } |
9972b25d TG |
1138 | } |
1139 | ||
1140 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
1141 | { | |
1b5c5493 | 1142 | __qdisc_reset_queue(&sch->q); |
9972b25d TG |
1143 | sch->qstats.backlog = 0; |
1144 | } | |
1145 | ||
86a7996c WC |
1146 | static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, |
1147 | struct Qdisc **pold) | |
1148 | { | |
1149 | struct Qdisc *old; | |
1150 | ||
1151 | sch_tree_lock(sch); | |
1152 | old = *pold; | |
1153 | *pold = new; | |
e5f0e8f8 PA |
1154 | if (old != NULL) |
1155 | qdisc_tree_flush_backlog(old); | |
86a7996c WC |
1156 | sch_tree_unlock(sch); |
1157 | ||
1158 | return old; | |
1159 | } | |
1160 | ||
1b5c5493 ED |
1161 | static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) |
1162 | { | |
1163 | rtnl_kfree_skbs(skb, skb); | |
1164 | qdisc_qstats_drop(sch); | |
1165 | } | |
1166 | ||
40bd0362 JF |
1167 | static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, |
1168 | struct sk_buff **to_free) | |
1169 | { | |
1170 | __qdisc_drop(skb, to_free); | |
1171 | qdisc_qstats_cpu_drop(sch); | |
1172 | ||
1173 | return NET_XMIT_DROP; | |
1174 | } | |
520ac30f ED |
1175 | |
1176 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, | |
1177 | struct sk_buff **to_free) | |
9972b25d | 1178 | { |
520ac30f | 1179 | __qdisc_drop(skb, to_free); |
25331d6c | 1180 | qdisc_qstats_drop(sch); |
9972b25d TG |
1181 | |
1182 | return NET_XMIT_DROP; | |
1183 | } | |
1184 | ||
35d889d1 AK |
1185 | static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, |
1186 | struct sk_buff **to_free) | |
1187 | { | |
1188 | __qdisc_drop_all(skb, to_free); | |
1189 | qdisc_qstats_drop(sch); | |
1190 | ||
1191 | return NET_XMIT_DROP; | |
1192 | } | |
1193 | ||
e9bef55d JDB |
1194 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
1195 | long it will take to send a packet given its size. | |
1196 | */ | |
1197 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
1198 | { | |
e08b0998 JDB |
1199 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
1200 | if (slot < 0) | |
1201 | slot = 0; | |
e9bef55d JDB |
1202 | slot >>= rtab->rate.cell_log; |
1203 | if (slot > 255) | |
a02cec21 | 1204 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
1205 | return rtab->data[slot]; |
1206 | } | |
1207 | ||
292f1c7f | 1208 | struct psched_ratecfg { |
130d3d68 | 1209 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
1210 | u32 mult; |
1211 | u16 overhead; | |
8a8e3d84 | 1212 | u8 linklayer; |
01cb71d2 | 1213 | u8 shift; |
292f1c7f JP |
1214 | }; |
1215 | ||
1216 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
1217 | unsigned int len) | |
1218 | { | |
8a8e3d84 JDB |
1219 | len += r->overhead; |
1220 | ||
1221 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
1222 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
1223 | ||
1224 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
1225 | } |
1226 | ||
5c15257f | 1227 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
1228 | const struct tc_ratespec *conf, |
1229 | u64 rate64); | |
292f1c7f | 1230 | |
01cb71d2 ED |
1231 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
1232 | const struct psched_ratecfg *r) | |
292f1c7f | 1233 | { |
01cb71d2 | 1234 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
1235 | |
1236 | /* legacy struct tc_ratespec has a 32bit @rate field | |
1237 | * Qdisc using 64bit rate should add new attributes | |
1238 | * in order to maintain compatibility. | |
1239 | */ | |
1240 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
1241 | ||
01cb71d2 | 1242 | res->overhead = r->overhead; |
8a8e3d84 | 1243 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
1244 | } |
1245 | ||
46209401 JP |
1246 | /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. |
1247 | * The fast path only needs to access filter list and to update stats | |
1248 | */ | |
1249 | struct mini_Qdisc { | |
1250 | struct tcf_proto *filter_list; | |
7d17c544 | 1251 | struct tcf_block *block; |
46209401 JP |
1252 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; |
1253 | struct gnet_stats_queue __percpu *cpu_qstats; | |
1254 | struct rcu_head rcu; | |
1255 | }; | |
1256 | ||
1257 | static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, | |
1258 | const struct sk_buff *skb) | |
1259 | { | |
1260 | bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb); | |
1261 | } | |
1262 | ||
1263 | static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) | |
1264 | { | |
1265 | this_cpu_inc(miniq->cpu_qstats->drops); | |
1266 | } | |
1267 | ||
1268 | struct mini_Qdisc_pair { | |
1269 | struct mini_Qdisc miniq1; | |
1270 | struct mini_Qdisc miniq2; | |
1271 | struct mini_Qdisc __rcu **p_miniq; | |
1272 | }; | |
1273 | ||
1274 | void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, | |
1275 | struct tcf_proto *tp_head); | |
1276 | void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, | |
1277 | struct mini_Qdisc __rcu **p_miniq); | |
7d17c544 PB |
1278 | void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp, |
1279 | struct tcf_block *block); | |
46209401 | 1280 | |
ef816f3c | 1281 | static inline int skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res) |
cd11b164 | 1282 | { |
ef816f3c | 1283 | return res->ingress ? netif_receive_skb(skb) : dev_queue_xmit(skb); |
cd11b164 PA |
1284 | } |
1285 | ||
1da177e4 | 1286 | #endif |