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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> |
1da177e4 | 16 | #include <net/gen_stats.h> |
be577ddc | 17 | #include <net/rtnetlink.h> |
1da177e4 LT |
18 | |
19 | struct Qdisc_ops; | |
20 | struct qdisc_walker; | |
21 | struct tcf_walker; | |
22 | struct module; | |
d58e468b | 23 | struct bpf_flow_keys; |
1da177e4 | 24 | |
e56185c7 JH |
25 | typedef int tc_setup_cb_t(enum tc_setup_type type, |
26 | void *type_data, void *cb_priv); | |
27 | ||
7f76fa36 JH |
28 | typedef int tc_indr_block_bind_cb_t(struct net_device *dev, void *cb_priv, |
29 | enum tc_setup_type type, void *type_data); | |
30 | ||
fd2c3ef7 | 31 | struct qdisc_rate_table { |
1da177e4 LT |
32 | struct tc_ratespec rate; |
33 | u32 data[256]; | |
34 | struct qdisc_rate_table *next; | |
35 | int refcnt; | |
36 | }; | |
37 | ||
fd2c3ef7 | 38 | enum qdisc_state_t { |
37437bb2 | 39 | __QDISC_STATE_SCHED, |
a9312ae8 | 40 | __QDISC_STATE_DEACTIVATED, |
e2627c8c DM |
41 | }; |
42 | ||
175f9c1b | 43 | struct qdisc_size_table { |
a2da570d | 44 | struct rcu_head rcu; |
175f9c1b JK |
45 | struct list_head list; |
46 | struct tc_sizespec szopts; | |
47 | int refcnt; | |
48 | u16 data[]; | |
49 | }; | |
50 | ||
48da34b7 FW |
51 | /* similar to sk_buff_head, but skb->prev pointer is undefined. */ |
52 | struct qdisc_skb_head { | |
53 | struct sk_buff *head; | |
54 | struct sk_buff *tail; | |
46b1c18f ED |
55 | union { |
56 | u32 qlen; | |
57 | atomic_t atomic_qlen; | |
58 | }; | |
48da34b7 FW |
59 | spinlock_t lock; |
60 | }; | |
61 | ||
fd2c3ef7 | 62 | struct Qdisc { |
520ac30f ED |
63 | int (*enqueue)(struct sk_buff *skb, |
64 | struct Qdisc *sch, | |
65 | struct sk_buff **to_free); | |
66 | struct sk_buff * (*dequeue)(struct Qdisc *sch); | |
05bdd2f1 | 67 | unsigned int flags; |
b00355db | 68 | #define TCQ_F_BUILTIN 1 |
fd245a4a ED |
69 | #define TCQ_F_INGRESS 2 |
70 | #define TCQ_F_CAN_BYPASS 4 | |
71 | #define TCQ_F_MQROOT 8 | |
1abbe139 ED |
72 | #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for |
73 | * q->dev_queue : It can test | |
74 | * netif_xmit_frozen_or_stopped() before | |
75 | * dequeueing next packet. | |
76 | * Its true for MQ/MQPRIO slaves, or non | |
77 | * multiqueue device. | |
78 | */ | |
b00355db | 79 | #define TCQ_F_WARN_NONWC (1 << 16) |
22e0f8b9 | 80 | #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ |
4eaf3b84 ED |
81 | #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : |
82 | * qdisc_tree_decrease_qlen() should stop. | |
83 | */ | |
49b49971 | 84 | #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ |
6b3ba914 | 85 | #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */ |
7a4fa291 | 86 | #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */ |
45203a3b | 87 | u32 limit; |
05bdd2f1 | 88 | const struct Qdisc_ops *ops; |
a2da570d | 89 | struct qdisc_size_table __rcu *stab; |
59cc1f61 | 90 | struct hlist_node hash; |
1da177e4 LT |
91 | u32 handle; |
92 | u32 parent; | |
72b25a91 | 93 | |
5e140dfc | 94 | struct netdev_queue *dev_queue; |
5e140dfc | 95 | |
1c0d32fd | 96 | struct net_rate_estimator __rcu *rate_est; |
0d32ef8c ED |
97 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; |
98 | struct gnet_stats_queue __percpu *cpu_qstats; | |
e9be0e99 PA |
99 | int padded; |
100 | refcount_t refcnt; | |
0d32ef8c | 101 | |
5e140dfc ED |
102 | /* |
103 | * For performance sake on SMP, we put highly modified fields at the end | |
104 | */ | |
a53851e2 | 105 | struct sk_buff_head gso_skb ____cacheline_aligned_in_smp; |
48da34b7 | 106 | struct qdisc_skb_head q; |
0d32ef8c | 107 | struct gnet_stats_basic_packed bstats; |
f9eb8aea | 108 | seqcount_t running; |
0d32ef8c | 109 | struct gnet_stats_queue qstats; |
4d202a0d ED |
110 | unsigned long state; |
111 | struct Qdisc *next_sched; | |
70e57d5e | 112 | struct sk_buff_head skb_bad_txq; |
45203a3b ED |
113 | |
114 | spinlock_t busylock ____cacheline_aligned_in_smp; | |
96009c7d | 115 | spinlock_t seqlock; |
3a7d0d07 | 116 | struct rcu_head rcu; |
1da177e4 LT |
117 | }; |
118 | ||
551143d8 ED |
119 | static inline void qdisc_refcount_inc(struct Qdisc *qdisc) |
120 | { | |
121 | if (qdisc->flags & TCQ_F_BUILTIN) | |
122 | return; | |
123 | refcount_inc(&qdisc->refcnt); | |
124 | } | |
125 | ||
9d7e82ce VB |
126 | /* Intended to be used by unlocked users, when concurrent qdisc release is |
127 | * possible. | |
128 | */ | |
129 | ||
130 | static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc) | |
131 | { | |
132 | if (qdisc->flags & TCQ_F_BUILTIN) | |
133 | return qdisc; | |
134 | if (refcount_inc_not_zero(&qdisc->refcnt)) | |
135 | return qdisc; | |
136 | return NULL; | |
137 | } | |
138 | ||
96009c7d | 139 | static inline bool qdisc_is_running(struct Qdisc *qdisc) |
bc135b23 | 140 | { |
32f7b44d | 141 | if (qdisc->flags & TCQ_F_NOLOCK) |
96009c7d | 142 | return spin_is_locked(&qdisc->seqlock); |
f9eb8aea | 143 | return (raw_read_seqcount(&qdisc->running) & 1) ? true : false; |
bc135b23 ED |
144 | } |
145 | ||
146 | static inline bool qdisc_run_begin(struct Qdisc *qdisc) | |
147 | { | |
32f7b44d | 148 | if (qdisc->flags & TCQ_F_NOLOCK) { |
96009c7d | 149 | if (!spin_trylock(&qdisc->seqlock)) |
32f7b44d PA |
150 | return false; |
151 | } else if (qdisc_is_running(qdisc)) { | |
fd245a4a | 152 | return false; |
32f7b44d | 153 | } |
52fbb290 ED |
154 | /* Variant of write_seqcount_begin() telling lockdep a trylock |
155 | * was attempted. | |
156 | */ | |
157 | raw_write_seqcount_begin(&qdisc->running); | |
158 | seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_); | |
fd245a4a | 159 | return true; |
bc135b23 ED |
160 | } |
161 | ||
162 | static inline void qdisc_run_end(struct Qdisc *qdisc) | |
163 | { | |
f9eb8aea | 164 | write_seqcount_end(&qdisc->running); |
32f7b44d | 165 | if (qdisc->flags & TCQ_F_NOLOCK) |
96009c7d | 166 | spin_unlock(&qdisc->seqlock); |
fd245a4a ED |
167 | } |
168 | ||
5772e9a3 JDB |
169 | static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) |
170 | { | |
171 | return qdisc->flags & TCQ_F_ONETXQUEUE; | |
172 | } | |
173 | ||
174 | static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) | |
175 | { | |
176 | #ifdef CONFIG_BQL | |
177 | /* Non-BQL migrated drivers will return 0, too. */ | |
178 | return dql_avail(&txq->dql); | |
179 | #else | |
180 | return 0; | |
181 | #endif | |
182 | } | |
183 | ||
fd2c3ef7 | 184 | struct Qdisc_class_ops { |
dfcd2a2b | 185 | unsigned int flags; |
1da177e4 | 186 | /* Child qdisc manipulation */ |
926e61b7 | 187 | struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); |
1da177e4 | 188 | int (*graft)(struct Qdisc *, unsigned long cl, |
653d6fd6 AA |
189 | struct Qdisc *, struct Qdisc **, |
190 | struct netlink_ext_ack *extack); | |
1da177e4 | 191 | struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); |
43effa1e | 192 | void (*qlen_notify)(struct Qdisc *, unsigned long); |
1da177e4 LT |
193 | |
194 | /* Class manipulation routines */ | |
143976ce | 195 | unsigned long (*find)(struct Qdisc *, u32 classid); |
1da177e4 | 196 | int (*change)(struct Qdisc *, u32, u32, |
793d81d6 AA |
197 | struct nlattr **, unsigned long *, |
198 | struct netlink_ext_ack *); | |
1da177e4 LT |
199 | int (*delete)(struct Qdisc *, unsigned long); |
200 | void (*walk)(struct Qdisc *, struct qdisc_walker * arg); | |
201 | ||
202 | /* Filter manipulation */ | |
0ac4bd68 | 203 | struct tcf_block * (*tcf_block)(struct Qdisc *sch, |
cbaacc4e AA |
204 | unsigned long arg, |
205 | struct netlink_ext_ack *extack); | |
1da177e4 LT |
206 | unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, |
207 | u32 classid); | |
208 | void (*unbind_tcf)(struct Qdisc *, unsigned long); | |
209 | ||
210 | /* rtnetlink specific */ | |
211 | int (*dump)(struct Qdisc *, unsigned long, | |
212 | struct sk_buff *skb, struct tcmsg*); | |
213 | int (*dump_stats)(struct Qdisc *, unsigned long, | |
214 | struct gnet_dump *); | |
215 | }; | |
216 | ||
dfcd2a2b VB |
217 | /* Qdisc_class_ops flag values */ |
218 | ||
219 | /* Implements API that doesn't require rtnl lock */ | |
220 | enum qdisc_class_ops_flags { | |
221 | QDISC_CLASS_OPS_DOIT_UNLOCKED = 1, | |
222 | }; | |
223 | ||
fd2c3ef7 | 224 | struct Qdisc_ops { |
1da177e4 | 225 | struct Qdisc_ops *next; |
20fea08b | 226 | const struct Qdisc_class_ops *cl_ops; |
1da177e4 LT |
227 | char id[IFNAMSIZ]; |
228 | int priv_size; | |
d59f5ffa | 229 | unsigned int static_flags; |
1da177e4 | 230 | |
520ac30f ED |
231 | int (*enqueue)(struct sk_buff *skb, |
232 | struct Qdisc *sch, | |
233 | struct sk_buff **to_free); | |
1da177e4 | 234 | struct sk_buff * (*dequeue)(struct Qdisc *); |
90d841fd | 235 | struct sk_buff * (*peek)(struct Qdisc *); |
1da177e4 | 236 | |
e63d7dfd AA |
237 | int (*init)(struct Qdisc *sch, struct nlattr *arg, |
238 | struct netlink_ext_ack *extack); | |
1da177e4 LT |
239 | void (*reset)(struct Qdisc *); |
240 | void (*destroy)(struct Qdisc *); | |
0ac4bd68 | 241 | int (*change)(struct Qdisc *sch, |
2030721c AA |
242 | struct nlattr *arg, |
243 | struct netlink_ext_ack *extack); | |
0ac4bd68 | 244 | void (*attach)(struct Qdisc *sch); |
48bfd55e | 245 | int (*change_tx_queue_len)(struct Qdisc *, unsigned int); |
1da177e4 LT |
246 | |
247 | int (*dump)(struct Qdisc *, struct sk_buff *); | |
248 | int (*dump_stats)(struct Qdisc *, struct gnet_dump *); | |
249 | ||
d47a6b0e JP |
250 | void (*ingress_block_set)(struct Qdisc *sch, |
251 | u32 block_index); | |
252 | void (*egress_block_set)(struct Qdisc *sch, | |
253 | u32 block_index); | |
254 | u32 (*ingress_block_get)(struct Qdisc *sch); | |
255 | u32 (*egress_block_get)(struct Qdisc *sch); | |
256 | ||
1da177e4 LT |
257 | struct module *owner; |
258 | }; | |
259 | ||
260 | ||
fd2c3ef7 | 261 | struct tcf_result { |
db50514f JP |
262 | union { |
263 | struct { | |
264 | unsigned long class; | |
265 | u32 classid; | |
266 | }; | |
267 | const struct tcf_proto *goto_tp; | |
cd11b164 PA |
268 | |
269 | /* used by the TC_ACT_REINSERT action */ | |
270 | struct { | |
271 | bool ingress; | |
272 | struct gnet_stats_queue *qstats; | |
273 | }; | |
db50514f | 274 | }; |
1da177e4 LT |
275 | }; |
276 | ||
9f407f17 JP |
277 | struct tcf_chain; |
278 | ||
fd2c3ef7 | 279 | struct tcf_proto_ops { |
36272874 | 280 | struct list_head head; |
1da177e4 LT |
281 | char kind[IFNAMSIZ]; |
282 | ||
dc7f9f6e ED |
283 | int (*classify)(struct sk_buff *, |
284 | const struct tcf_proto *, | |
285 | struct tcf_result *); | |
1da177e4 | 286 | int (*init)(struct tcf_proto*); |
12db03b6 | 287 | void (*destroy)(struct tcf_proto *tp, bool rtnl_held, |
715df5ec | 288 | struct netlink_ext_ack *extack); |
1da177e4 | 289 | |
8113c095 | 290 | void* (*get)(struct tcf_proto*, u32 handle); |
7d5509fa | 291 | void (*put)(struct tcf_proto *tp, void *f); |
c1b52739 | 292 | int (*change)(struct net *net, struct sk_buff *, |
af4c6641 | 293 | struct tcf_proto*, unsigned long, |
add93b61 | 294 | u32 handle, struct nlattr **, |
12db03b6 | 295 | void **, bool, bool, |
7306db38 | 296 | struct netlink_ext_ack *); |
8865fdd4 | 297 | int (*delete)(struct tcf_proto *tp, void *arg, |
12db03b6 | 298 | bool *last, bool rtnl_held, |
571acf21 | 299 | struct netlink_ext_ack *); |
12db03b6 VB |
300 | void (*walk)(struct tcf_proto *tp, |
301 | struct tcf_walker *arg, bool rtnl_held); | |
e56185c7 JH |
302 | int (*reoffload)(struct tcf_proto *tp, bool add, |
303 | tc_setup_cb_t *cb, void *cb_priv, | |
304 | struct netlink_ext_ack *extack); | |
07d79fc7 | 305 | void (*bind_class)(void *, u32, unsigned long); |
9f407f17 JP |
306 | void * (*tmplt_create)(struct net *net, |
307 | struct tcf_chain *chain, | |
308 | struct nlattr **tca, | |
309 | struct netlink_ext_ack *extack); | |
310 | void (*tmplt_destroy)(void *tmplt_priv); | |
1da177e4 LT |
311 | |
312 | /* rtnetlink specific */ | |
8113c095 | 313 | int (*dump)(struct net*, struct tcf_proto*, void *, |
12db03b6 VB |
314 | struct sk_buff *skb, struct tcmsg*, |
315 | bool); | |
9f407f17 JP |
316 | int (*tmplt_dump)(struct sk_buff *skb, |
317 | struct net *net, | |
318 | void *tmplt_priv); | |
1da177e4 LT |
319 | |
320 | struct module *owner; | |
12db03b6 VB |
321 | int flags; |
322 | }; | |
323 | ||
324 | enum tcf_proto_ops_flags { | |
325 | TCF_PROTO_OPS_DOIT_UNLOCKED = 1, | |
1da177e4 LT |
326 | }; |
327 | ||
fd2c3ef7 | 328 | struct tcf_proto { |
1da177e4 | 329 | /* Fast access part */ |
25d8c0d5 JF |
330 | struct tcf_proto __rcu *next; |
331 | void __rcu *root; | |
7fd4b288 PA |
332 | |
333 | /* called under RCU BH lock*/ | |
dc7f9f6e ED |
334 | int (*classify)(struct sk_buff *, |
335 | const struct tcf_proto *, | |
336 | struct tcf_result *); | |
66c6f529 | 337 | __be16 protocol; |
1da177e4 LT |
338 | |
339 | /* All the rest */ | |
340 | u32 prio; | |
1da177e4 | 341 | void *data; |
dc7f9f6e | 342 | const struct tcf_proto_ops *ops; |
5bc17018 | 343 | struct tcf_chain *chain; |
8b64678e VB |
344 | /* Lock protects tcf_proto shared state and can be used by unlocked |
345 | * classifiers to protect their private data. | |
346 | */ | |
347 | spinlock_t lock; | |
348 | bool deleting; | |
4dbfa766 | 349 | refcount_t refcnt; |
25d8c0d5 | 350 | struct rcu_head rcu; |
1da177e4 LT |
351 | }; |
352 | ||
175f9c1b | 353 | struct qdisc_skb_cb { |
d58e468b PP |
354 | union { |
355 | struct { | |
356 | unsigned int pkt_len; | |
357 | u16 slave_dev_queue_mapping; | |
358 | u16 tc_classid; | |
359 | }; | |
360 | struct bpf_flow_keys *flow_keys; | |
361 | }; | |
25711786 ED |
362 | #define QDISC_CB_PRIV_LEN 20 |
363 | unsigned char data[QDISC_CB_PRIV_LEN]; | |
175f9c1b JK |
364 | }; |
365 | ||
c7eb7d72 JP |
366 | typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv); |
367 | ||
2190d1d0 | 368 | struct tcf_chain { |
ed76f5ed VB |
369 | /* Protects filter_chain. */ |
370 | struct mutex filter_chain_lock; | |
2190d1d0 | 371 | struct tcf_proto __rcu *filter_chain; |
5bc17018 JP |
372 | struct list_head list; |
373 | struct tcf_block *block; | |
374 | u32 index; /* chain index */ | |
375 | unsigned int refcnt; | |
1f3ed383 | 376 | unsigned int action_refcnt; |
32a4f5ec | 377 | bool explicitly_created; |
726d0612 | 378 | bool flushing; |
9f407f17 JP |
379 | const struct tcf_proto_ops *tmplt_ops; |
380 | void *tmplt_priv; | |
ee3bbfe8 | 381 | struct rcu_head rcu; |
6529eaba JP |
382 | }; |
383 | ||
2190d1d0 | 384 | struct tcf_block { |
c266f64d VB |
385 | /* Lock protects tcf_block and lifetime-management data of chains |
386 | * attached to the block (refcnt, action_refcnt, explicitly_created). | |
387 | */ | |
388 | struct mutex lock; | |
5bc17018 | 389 | struct list_head chain_list; |
48617387 | 390 | u32 index; /* block index for shared blocks */ |
cfebd7e2 | 391 | refcount_t refcnt; |
855319be | 392 | struct net *net; |
69d78ef2 | 393 | struct Qdisc *q; |
acb67442 | 394 | struct list_head cb_list; |
f36fe1c4 JP |
395 | struct list_head owner_list; |
396 | bool keep_dst; | |
caa72601 JP |
397 | unsigned int offloadcnt; /* Number of oddloaded filters */ |
398 | unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */ | |
f71e0ca4 JP |
399 | struct { |
400 | struct tcf_chain *chain; | |
401 | struct list_head filter_chain_list; | |
402 | } chain0; | |
0607e439 | 403 | struct rcu_head rcu; |
2190d1d0 JP |
404 | }; |
405 | ||
ed76f5ed VB |
406 | #ifdef CONFIG_PROVE_LOCKING |
407 | static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain) | |
408 | { | |
409 | return lockdep_is_held(&chain->filter_chain_lock); | |
410 | } | |
8b64678e VB |
411 | |
412 | static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) | |
413 | { | |
414 | return lockdep_is_held(&tp->lock); | |
415 | } | |
ed76f5ed VB |
416 | #else |
417 | static inline bool lockdep_tcf_chain_is_locked(struct tcf_block *chain) | |
418 | { | |
419 | return true; | |
420 | } | |
8b64678e VB |
421 | |
422 | static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) | |
423 | { | |
424 | return true; | |
425 | } | |
ed76f5ed VB |
426 | #endif /* #ifdef CONFIG_PROVE_LOCKING */ |
427 | ||
428 | #define tcf_chain_dereference(p, chain) \ | |
429 | rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain)) | |
430 | ||
8b64678e VB |
431 | #define tcf_proto_dereference(p, tp) \ |
432 | rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp)) | |
433 | ||
caa72601 JP |
434 | static inline void tcf_block_offload_inc(struct tcf_block *block, u32 *flags) |
435 | { | |
436 | if (*flags & TCA_CLS_FLAGS_IN_HW) | |
437 | return; | |
438 | *flags |= TCA_CLS_FLAGS_IN_HW; | |
439 | block->offloadcnt++; | |
440 | } | |
441 | ||
442 | static inline void tcf_block_offload_dec(struct tcf_block *block, u32 *flags) | |
443 | { | |
444 | if (!(*flags & TCA_CLS_FLAGS_IN_HW)) | |
445 | return; | |
446 | *flags &= ~TCA_CLS_FLAGS_IN_HW; | |
447 | block->offloadcnt--; | |
448 | } | |
449 | ||
31533cba | 450 | static inline void |
86c55361 | 451 | tc_cls_offload_cnt_update(struct tcf_block *block, u32 *cnt, |
31533cba JH |
452 | u32 *flags, bool add) |
453 | { | |
454 | if (add) { | |
455 | if (!*cnt) | |
456 | tcf_block_offload_inc(block, flags); | |
457 | (*cnt)++; | |
458 | } else { | |
459 | (*cnt)--; | |
460 | if (!*cnt) | |
461 | tcf_block_offload_dec(block, flags); | |
462 | } | |
463 | } | |
464 | ||
16bda13d DM |
465 | static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
466 | { | |
467 | struct qdisc_skb_cb *qcb; | |
5ee31c68 ED |
468 | |
469 | BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz); | |
16bda13d DM |
470 | BUILD_BUG_ON(sizeof(qcb->data) < sz); |
471 | } | |
472 | ||
05bdd2f1 | 473 | static inline int qdisc_qlen(const struct Qdisc *q) |
bbd8a0d3 KK |
474 | { |
475 | return q->q.qlen; | |
476 | } | |
477 | ||
46b1c18f | 478 | static inline u32 qdisc_qlen_sum(const struct Qdisc *q) |
7e66016f | 479 | { |
46b1c18f | 480 | u32 qlen = q->qstats.qlen; |
7e66016f | 481 | |
46b1c18f ED |
482 | if (q->flags & TCQ_F_NOLOCK) |
483 | qlen += atomic_read(&q->q.atomic_qlen); | |
484 | else | |
6172abc1 | 485 | qlen += q->q.qlen; |
7e66016f JF |
486 | |
487 | return qlen; | |
488 | } | |
489 | ||
bfe0d029 | 490 | static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
175f9c1b JK |
491 | { |
492 | return (struct qdisc_skb_cb *)skb->cb; | |
493 | } | |
494 | ||
83874000 DM |
495 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
496 | { | |
497 | return &qdisc->q.lock; | |
498 | } | |
499 | ||
05bdd2f1 | 500 | static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
7698b4fc | 501 | { |
46e5da40 JF |
502 | struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
503 | ||
504 | return q; | |
7698b4fc DM |
505 | } |
506 | ||
05bdd2f1 | 507 | static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
2540e051 JP |
508 | { |
509 | return qdisc->dev_queue->qdisc_sleeping; | |
510 | } | |
511 | ||
7e43f112 DM |
512 | /* The qdisc root lock is a mechanism by which to top level |
513 | * of a qdisc tree can be locked from any qdisc node in the | |
514 | * forest. This allows changing the configuration of some | |
515 | * aspect of the qdisc tree while blocking out asynchronous | |
516 | * qdisc access in the packet processing paths. | |
517 | * | |
518 | * It is only legal to do this when the root will not change | |
519 | * on us. Otherwise we'll potentially lock the wrong qdisc | |
520 | * root. This is enforced by holding the RTNL semaphore, which | |
521 | * all users of this lock accessor must do. | |
522 | */ | |
05bdd2f1 | 523 | static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc) |
7698b4fc DM |
524 | { |
525 | struct Qdisc *root = qdisc_root(qdisc); | |
526 | ||
7e43f112 | 527 | ASSERT_RTNL(); |
83874000 | 528 | return qdisc_lock(root); |
7698b4fc DM |
529 | } |
530 | ||
05bdd2f1 | 531 | static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
f6f9b93f JP |
532 | { |
533 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
534 | ||
535 | ASSERT_RTNL(); | |
536 | return qdisc_lock(root); | |
537 | } | |
538 | ||
edb09eb1 ED |
539 | static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc) |
540 | { | |
541 | struct Qdisc *root = qdisc_root_sleeping(qdisc); | |
542 | ||
543 | ASSERT_RTNL(); | |
544 | return &root->running; | |
545 | } | |
546 | ||
05bdd2f1 | 547 | static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) |
5ce2d488 DM |
548 | { |
549 | return qdisc->dev_queue->dev; | |
550 | } | |
1da177e4 | 551 | |
05bdd2f1 | 552 | static inline void sch_tree_lock(const struct Qdisc *q) |
78a5b30b | 553 | { |
fe439dd0 | 554 | spin_lock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
555 | } |
556 | ||
05bdd2f1 | 557 | static inline void sch_tree_unlock(const struct Qdisc *q) |
78a5b30b | 558 | { |
fe439dd0 | 559 | spin_unlock_bh(qdisc_root_sleeping_lock(q)); |
78a5b30b DM |
560 | } |
561 | ||
e41a33e6 TG |
562 | extern struct Qdisc noop_qdisc; |
563 | extern struct Qdisc_ops noop_qdisc_ops; | |
6ec1c69a DM |
564 | extern struct Qdisc_ops pfifo_fast_ops; |
565 | extern struct Qdisc_ops mq_qdisc_ops; | |
d66d6c31 | 566 | extern struct Qdisc_ops noqueue_qdisc_ops; |
6da7c8fc | 567 | extern const struct Qdisc_ops *default_qdisc_ops; |
1f27cde3 ED |
568 | static inline const struct Qdisc_ops * |
569 | get_default_qdisc_ops(const struct net_device *dev, int ntx) | |
570 | { | |
571 | return ntx < dev->real_num_tx_queues ? | |
572 | default_qdisc_ops : &pfifo_fast_ops; | |
573 | } | |
e41a33e6 | 574 | |
fd2c3ef7 | 575 | struct Qdisc_class_common { |
6fe1c7a5 PM |
576 | u32 classid; |
577 | struct hlist_node hnode; | |
578 | }; | |
579 | ||
fd2c3ef7 | 580 | struct Qdisc_class_hash { |
6fe1c7a5 PM |
581 | struct hlist_head *hash; |
582 | unsigned int hashsize; | |
583 | unsigned int hashmask; | |
584 | unsigned int hashelems; | |
585 | }; | |
586 | ||
587 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) | |
588 | { | |
589 | id ^= id >> 8; | |
590 | id ^= id >> 4; | |
591 | return id & mask; | |
592 | } | |
593 | ||
594 | static inline struct Qdisc_class_common * | |
05bdd2f1 | 595 | qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
6fe1c7a5 PM |
596 | { |
597 | struct Qdisc_class_common *cl; | |
6fe1c7a5 PM |
598 | unsigned int h; |
599 | ||
7d3f0cd4 GF |
600 | if (!id) |
601 | return NULL; | |
602 | ||
6fe1c7a5 | 603 | h = qdisc_class_hash(id, hash->hashmask); |
b67bfe0d | 604 | hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
6fe1c7a5 PM |
605 | if (cl->classid == id) |
606 | return cl; | |
607 | } | |
608 | return NULL; | |
609 | } | |
610 | ||
384c181e AN |
611 | static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) |
612 | { | |
613 | u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; | |
614 | ||
615 | return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; | |
616 | } | |
617 | ||
5c15257f JP |
618 | int qdisc_class_hash_init(struct Qdisc_class_hash *); |
619 | void qdisc_class_hash_insert(struct Qdisc_class_hash *, | |
620 | struct Qdisc_class_common *); | |
621 | void qdisc_class_hash_remove(struct Qdisc_class_hash *, | |
622 | struct Qdisc_class_common *); | |
623 | void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); | |
624 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *); | |
625 | ||
48bfd55e | 626 | int dev_qdisc_change_tx_queue_len(struct net_device *dev); |
5c15257f JP |
627 | void dev_init_scheduler(struct net_device *dev); |
628 | void dev_shutdown(struct net_device *dev); | |
629 | void dev_activate(struct net_device *dev); | |
630 | void dev_deactivate(struct net_device *dev); | |
631 | void dev_deactivate_many(struct list_head *head); | |
632 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, | |
633 | struct Qdisc *qdisc); | |
634 | void qdisc_reset(struct Qdisc *qdisc); | |
86bd446b | 635 | void qdisc_put(struct Qdisc *qdisc); |
3a7d0d07 | 636 | void qdisc_put_unlocked(struct Qdisc *qdisc); |
5f2939d9 | 637 | void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len); |
b592843c JK |
638 | #ifdef CONFIG_NET_SCHED |
639 | int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, | |
640 | void *type_data); | |
bfaee911 JK |
641 | void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, |
642 | struct Qdisc *new, struct Qdisc *old, | |
643 | enum tc_setup_type type, void *type_data, | |
644 | struct netlink_ext_ack *extack); | |
b592843c JK |
645 | #else |
646 | static inline int | |
647 | qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, | |
648 | void *type_data) | |
649 | { | |
650 | q->flags &= ~TCQ_F_OFFLOADED; | |
651 | return 0; | |
652 | } | |
bfaee911 JK |
653 | |
654 | static inline void | |
655 | qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, | |
656 | struct Qdisc *new, struct Qdisc *old, | |
657 | enum tc_setup_type type, void *type_data, | |
658 | struct netlink_ext_ack *extack) | |
659 | { | |
660 | } | |
b592843c | 661 | #endif |
5c15257f | 662 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
d0bd684d AA |
663 | const struct Qdisc_ops *ops, |
664 | struct netlink_ext_ack *extack); | |
81d947e2 | 665 | void qdisc_free(struct Qdisc *qdisc); |
5c15257f | 666 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
a38a9882 AA |
667 | const struct Qdisc_ops *ops, u32 parentid, |
668 | struct netlink_ext_ack *extack); | |
5c15257f JP |
669 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
670 | const struct qdisc_size_table *stab); | |
27b29f63 | 671 | int skb_do_redirect(struct sk_buff *); |
1da177e4 | 672 | |
a5135bcf WB |
673 | static inline void skb_reset_tc(struct sk_buff *skb) |
674 | { | |
675 | #ifdef CONFIG_NET_CLS_ACT | |
bc31c905 | 676 | skb->tc_redirected = 0; |
a5135bcf WB |
677 | #endif |
678 | } | |
679 | ||
cd11b164 PA |
680 | static inline bool skb_is_tc_redirected(const struct sk_buff *skb) |
681 | { | |
682 | #ifdef CONFIG_NET_CLS_ACT | |
683 | return skb->tc_redirected; | |
684 | #else | |
685 | return false; | |
686 | #endif | |
687 | } | |
688 | ||
fdc5432a DB |
689 | static inline bool skb_at_tc_ingress(const struct sk_buff *skb) |
690 | { | |
691 | #ifdef CONFIG_NET_CLS_ACT | |
8dc07fdb | 692 | return skb->tc_at_ingress; |
fdc5432a DB |
693 | #else |
694 | return false; | |
695 | #endif | |
696 | } | |
697 | ||
e7246e12 WB |
698 | static inline bool skb_skip_tc_classify(struct sk_buff *skb) |
699 | { | |
700 | #ifdef CONFIG_NET_CLS_ACT | |
701 | if (skb->tc_skip_classify) { | |
702 | skb->tc_skip_classify = 0; | |
703 | return true; | |
704 | } | |
705 | #endif | |
706 | return false; | |
707 | } | |
708 | ||
3a053b1a | 709 | /* Reset all TX qdiscs greater than index of a device. */ |
f0796d5c | 710 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) |
5aa70995 | 711 | { |
4ef6acff JF |
712 | struct Qdisc *qdisc; |
713 | ||
f0796d5c | 714 | for (; i < dev->num_tx_queues; i++) { |
46e5da40 | 715 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
4ef6acff JF |
716 | if (qdisc) { |
717 | spin_lock_bh(qdisc_lock(qdisc)); | |
718 | qdisc_reset(qdisc); | |
719 | spin_unlock_bh(qdisc_lock(qdisc)); | |
720 | } | |
721 | } | |
5aa70995 DM |
722 | } |
723 | ||
5aa70995 DM |
724 | static inline void qdisc_reset_all_tx(struct net_device *dev) |
725 | { | |
f0796d5c | 726 | qdisc_reset_all_tx_gt(dev, 0); |
5aa70995 DM |
727 | } |
728 | ||
3e745dd6 DM |
729 | /* Are all TX queues of the device empty? */ |
730 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) | |
731 | { | |
e8a0464c | 732 | unsigned int i; |
46e5da40 JF |
733 | |
734 | rcu_read_lock(); | |
e8a0464c DM |
735 | for (i = 0; i < dev->num_tx_queues; i++) { |
736 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 737 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
3e745dd6 | 738 | |
46e5da40 JF |
739 | if (q->q.qlen) { |
740 | rcu_read_unlock(); | |
e8a0464c | 741 | return false; |
46e5da40 | 742 | } |
e8a0464c | 743 | } |
46e5da40 | 744 | rcu_read_unlock(); |
e8a0464c | 745 | return true; |
3e745dd6 DM |
746 | } |
747 | ||
6fa9864b | 748 | /* Are any of the TX qdiscs changing? */ |
05bdd2f1 | 749 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
6fa9864b | 750 | { |
e8a0464c | 751 | unsigned int i; |
46e5da40 | 752 | |
e8a0464c DM |
753 | for (i = 0; i < dev->num_tx_queues; i++) { |
754 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 755 | if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping) |
e8a0464c DM |
756 | return true; |
757 | } | |
758 | return false; | |
6fa9864b DM |
759 | } |
760 | ||
e8a0464c | 761 | /* Is the device using the noop qdisc on all queues? */ |
05297949 DM |
762 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
763 | { | |
e8a0464c | 764 | unsigned int i; |
46e5da40 | 765 | |
e8a0464c DM |
766 | for (i = 0; i < dev->num_tx_queues; i++) { |
767 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); | |
46e5da40 | 768 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
e8a0464c DM |
769 | return false; |
770 | } | |
771 | return true; | |
05297949 DM |
772 | } |
773 | ||
bfe0d029 | 774 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
0abf77e5 | 775 | { |
175f9c1b | 776 | return qdisc_skb_cb(skb)->pkt_len; |
0abf77e5 JK |
777 | } |
778 | ||
c27f339a | 779 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
378a2f09 JP |
780 | enum net_xmit_qdisc_t { |
781 | __NET_XMIT_STOLEN = 0x00010000, | |
c27f339a | 782 | __NET_XMIT_BYPASS = 0x00020000, |
378a2f09 JP |
783 | }; |
784 | ||
c27f339a | 785 | #ifdef CONFIG_NET_CLS_ACT |
378a2f09 | 786 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
378a2f09 JP |
787 | #else |
788 | #define net_xmit_drop_count(e) (1) | |
789 | #endif | |
790 | ||
a2da570d ED |
791 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
792 | const struct Qdisc *sch) | |
5f86173b | 793 | { |
3a682fbd | 794 | #ifdef CONFIG_NET_SCHED |
a2da570d ED |
795 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
796 | ||
797 | if (stab) | |
798 | __qdisc_calculate_pkt_len(skb, stab); | |
3a682fbd | 799 | #endif |
a2da570d ED |
800 | } |
801 | ||
520ac30f ED |
802 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
803 | struct sk_buff **to_free) | |
a2da570d ED |
804 | { |
805 | qdisc_calculate_pkt_len(skb, sch); | |
520ac30f | 806 | return sch->enqueue(skb, sch, to_free); |
5f86173b JK |
807 | } |
808 | ||
22e0f8b9 JF |
809 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
810 | { | |
811 | return q->flags & TCQ_F_CPUSTATS; | |
812 | } | |
bfe0d029 | 813 | |
38040702 AV |
814 | static inline void _bstats_update(struct gnet_stats_basic_packed *bstats, |
815 | __u64 bytes, __u32 packets) | |
816 | { | |
817 | bstats->bytes += bytes; | |
818 | bstats->packets += packets; | |
819 | } | |
820 | ||
bfe0d029 ED |
821 | static inline void bstats_update(struct gnet_stats_basic_packed *bstats, |
822 | const struct sk_buff *skb) | |
823 | { | |
38040702 AV |
824 | _bstats_update(bstats, |
825 | qdisc_pkt_len(skb), | |
826 | skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); | |
827 | } | |
828 | ||
829 | static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, | |
830 | __u64 bytes, __u32 packets) | |
831 | { | |
832 | u64_stats_update_begin(&bstats->syncp); | |
833 | _bstats_update(&bstats->bstats, bytes, packets); | |
834 | u64_stats_update_end(&bstats->syncp); | |
bfe0d029 ED |
835 | } |
836 | ||
24ea591d ED |
837 | static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats, |
838 | const struct sk_buff *skb) | |
22e0f8b9 | 839 | { |
22e0f8b9 JF |
840 | u64_stats_update_begin(&bstats->syncp); |
841 | bstats_update(&bstats->bstats, skb); | |
842 | u64_stats_update_end(&bstats->syncp); | |
843 | } | |
844 | ||
24ea591d ED |
845 | static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
846 | const struct sk_buff *skb) | |
847 | { | |
848 | bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb); | |
849 | } | |
850 | ||
bfe0d029 ED |
851 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
852 | const struct sk_buff *skb) | |
bbd8a0d3 | 853 | { |
bfe0d029 | 854 | bstats_update(&sch->bstats, skb); |
bbd8a0d3 KK |
855 | } |
856 | ||
25331d6c JF |
857 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
858 | const struct sk_buff *skb) | |
859 | { | |
860 | sch->qstats.backlog -= qdisc_pkt_len(skb); | |
861 | } | |
862 | ||
40bd0362 JF |
863 | static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch, |
864 | const struct sk_buff *skb) | |
865 | { | |
866 | this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); | |
867 | } | |
868 | ||
25331d6c JF |
869 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, |
870 | const struct sk_buff *skb) | |
871 | { | |
872 | sch->qstats.backlog += qdisc_pkt_len(skb); | |
873 | } | |
874 | ||
40bd0362 JF |
875 | static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch, |
876 | const struct sk_buff *skb) | |
877 | { | |
878 | this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); | |
879 | } | |
880 | ||
46b1c18f | 881 | static inline void qdisc_qstats_atomic_qlen_inc(struct Qdisc *sch) |
40bd0362 | 882 | { |
46b1c18f | 883 | atomic_inc(&sch->q.atomic_qlen); |
40bd0362 JF |
884 | } |
885 | ||
46b1c18f | 886 | static inline void qdisc_qstats_atomic_qlen_dec(struct Qdisc *sch) |
40bd0362 | 887 | { |
46b1c18f | 888 | atomic_dec(&sch->q.atomic_qlen); |
40bd0362 JF |
889 | } |
890 | ||
891 | static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) | |
892 | { | |
893 | this_cpu_inc(sch->cpu_qstats->requeues); | |
894 | } | |
895 | ||
25331d6c JF |
896 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) |
897 | { | |
898 | sch->qstats.drops += count; | |
899 | } | |
900 | ||
24ea591d | 901 | static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
25331d6c | 902 | { |
24ea591d | 903 | qstats->drops++; |
25331d6c JF |
904 | } |
905 | ||
24ea591d | 906 | static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
b0ab6f92 | 907 | { |
24ea591d ED |
908 | qstats->overlimits++; |
909 | } | |
b0ab6f92 | 910 | |
24ea591d ED |
911 | static inline void qdisc_qstats_drop(struct Qdisc *sch) |
912 | { | |
913 | qstats_drop_inc(&sch->qstats); | |
914 | } | |
915 | ||
916 | static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) | |
917 | { | |
eb60a8dd | 918 | this_cpu_inc(sch->cpu_qstats->drops); |
b0ab6f92 JF |
919 | } |
920 | ||
25331d6c JF |
921 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
922 | { | |
923 | sch->qstats.overlimits++; | |
924 | } | |
925 | ||
48da34b7 FW |
926 | static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh) |
927 | { | |
928 | qh->head = NULL; | |
929 | qh->tail = NULL; | |
930 | qh->qlen = 0; | |
931 | } | |
932 | ||
aea890b8 DM |
933 | static inline void __qdisc_enqueue_tail(struct sk_buff *skb, |
934 | struct qdisc_skb_head *qh) | |
9972b25d | 935 | { |
48da34b7 FW |
936 | struct sk_buff *last = qh->tail; |
937 | ||
938 | if (last) { | |
939 | skb->next = NULL; | |
940 | last->next = skb; | |
941 | qh->tail = skb; | |
942 | } else { | |
943 | qh->tail = skb; | |
944 | qh->head = skb; | |
945 | } | |
946 | qh->qlen++; | |
9972b25d TG |
947 | } |
948 | ||
949 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) | |
950 | { | |
aea890b8 DM |
951 | __qdisc_enqueue_tail(skb, &sch->q); |
952 | qdisc_qstats_backlog_inc(sch, skb); | |
953 | return NET_XMIT_SUCCESS; | |
9972b25d TG |
954 | } |
955 | ||
59697730 DM |
956 | static inline void __qdisc_enqueue_head(struct sk_buff *skb, |
957 | struct qdisc_skb_head *qh) | |
958 | { | |
959 | skb->next = qh->head; | |
960 | ||
961 | if (!qh->head) | |
962 | qh->tail = skb; | |
963 | qh->head = skb; | |
964 | qh->qlen++; | |
965 | } | |
966 | ||
48da34b7 | 967 | static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) |
9972b25d | 968 | { |
48da34b7 FW |
969 | struct sk_buff *skb = qh->head; |
970 | ||
971 | if (likely(skb != NULL)) { | |
972 | qh->head = skb->next; | |
973 | qh->qlen--; | |
974 | if (qh->head == NULL) | |
975 | qh->tail = NULL; | |
976 | skb->next = NULL; | |
977 | } | |
9972b25d | 978 | |
ec323368 FW |
979 | return skb; |
980 | } | |
981 | ||
982 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) | |
983 | { | |
984 | struct sk_buff *skb = __qdisc_dequeue_head(&sch->q); | |
985 | ||
9190b3b3 | 986 | if (likely(skb != NULL)) { |
25331d6c | 987 | qdisc_qstats_backlog_dec(sch, skb); |
9190b3b3 ED |
988 | qdisc_bstats_update(sch, skb); |
989 | } | |
9972b25d TG |
990 | |
991 | return skb; | |
992 | } | |
993 | ||
520ac30f ED |
994 | /* Instead of calling kfree_skb() while root qdisc lock is held, |
995 | * queue the skb for future freeing at end of __dev_xmit_skb() | |
996 | */ | |
997 | static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) | |
998 | { | |
999 | skb->next = *to_free; | |
1000 | *to_free = skb; | |
1001 | } | |
1002 | ||
35d889d1 AK |
1003 | static inline void __qdisc_drop_all(struct sk_buff *skb, |
1004 | struct sk_buff **to_free) | |
1005 | { | |
1006 | if (skb->prev) | |
1007 | skb->prev->next = *to_free; | |
1008 | else | |
1009 | skb->next = *to_free; | |
1010 | *to_free = skb; | |
1011 | } | |
1012 | ||
57dbb2d8 | 1013 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, |
48da34b7 | 1014 | struct qdisc_skb_head *qh, |
520ac30f | 1015 | struct sk_buff **to_free) |
57dbb2d8 | 1016 | { |
48da34b7 | 1017 | struct sk_buff *skb = __qdisc_dequeue_head(qh); |
57dbb2d8 HPP |
1018 | |
1019 | if (likely(skb != NULL)) { | |
1020 | unsigned int len = qdisc_pkt_len(skb); | |
520ac30f | 1021 | |
25331d6c | 1022 | qdisc_qstats_backlog_dec(sch, skb); |
520ac30f | 1023 | __qdisc_drop(skb, to_free); |
57dbb2d8 HPP |
1024 | return len; |
1025 | } | |
1026 | ||
1027 | return 0; | |
1028 | } | |
1029 | ||
520ac30f ED |
1030 | static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch, |
1031 | struct sk_buff **to_free) | |
57dbb2d8 | 1032 | { |
520ac30f | 1033 | return __qdisc_queue_drop_head(sch, &sch->q, to_free); |
9972b25d TG |
1034 | } |
1035 | ||
48a8f519 PM |
1036 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
1037 | { | |
48da34b7 FW |
1038 | const struct qdisc_skb_head *qh = &sch->q; |
1039 | ||
1040 | return qh->head; | |
48a8f519 PM |
1041 | } |
1042 | ||
77be155c JP |
1043 | /* generic pseudo peek method for non-work-conserving qdisc */ |
1044 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) | |
1045 | { | |
a53851e2 JF |
1046 | struct sk_buff *skb = skb_peek(&sch->gso_skb); |
1047 | ||
77be155c | 1048 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ |
a53851e2 JF |
1049 | if (!skb) { |
1050 | skb = sch->dequeue(sch); | |
1051 | ||
1052 | if (skb) { | |
1053 | __skb_queue_head(&sch->gso_skb, skb); | |
61c9eaf9 | 1054 | /* it's still part of the queue */ |
a53851e2 | 1055 | qdisc_qstats_backlog_inc(sch, skb); |
61c9eaf9 | 1056 | sch->q.qlen++; |
a27758ff | 1057 | } |
61c9eaf9 | 1058 | } |
77be155c | 1059 | |
a53851e2 | 1060 | return skb; |
77be155c JP |
1061 | } |
1062 | ||
1063 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ | |
1064 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) | |
1065 | { | |
a53851e2 | 1066 | struct sk_buff *skb = skb_peek(&sch->gso_skb); |
77be155c | 1067 | |
61c9eaf9 | 1068 | if (skb) { |
a53851e2 | 1069 | skb = __skb_dequeue(&sch->gso_skb); |
a27758ff | 1070 | qdisc_qstats_backlog_dec(sch, skb); |
61c9eaf9 JP |
1071 | sch->q.qlen--; |
1072 | } else { | |
77be155c | 1073 | skb = sch->dequeue(sch); |
61c9eaf9 | 1074 | } |
77be155c JP |
1075 | |
1076 | return skb; | |
1077 | } | |
1078 | ||
48da34b7 | 1079 | static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) |
9972b25d TG |
1080 | { |
1081 | /* | |
1082 | * We do not know the backlog in bytes of this list, it | |
1083 | * is up to the caller to correct it | |
1084 | */ | |
48da34b7 FW |
1085 | ASSERT_RTNL(); |
1086 | if (qh->qlen) { | |
1087 | rtnl_kfree_skbs(qh->head, qh->tail); | |
1088 | ||
1089 | qh->head = NULL; | |
1090 | qh->tail = NULL; | |
1091 | qh->qlen = 0; | |
1b5c5493 | 1092 | } |
9972b25d TG |
1093 | } |
1094 | ||
1095 | static inline void qdisc_reset_queue(struct Qdisc *sch) | |
1096 | { | |
1b5c5493 | 1097 | __qdisc_reset_queue(&sch->q); |
9972b25d TG |
1098 | sch->qstats.backlog = 0; |
1099 | } | |
1100 | ||
86a7996c WC |
1101 | static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, |
1102 | struct Qdisc **pold) | |
1103 | { | |
1104 | struct Qdisc *old; | |
1105 | ||
1106 | sch_tree_lock(sch); | |
1107 | old = *pold; | |
1108 | *pold = new; | |
1109 | if (old != NULL) { | |
68a66d14 KK |
1110 | unsigned int qlen = old->q.qlen; |
1111 | unsigned int backlog = old->qstats.backlog; | |
1112 | ||
86a7996c | 1113 | qdisc_reset(old); |
68a66d14 | 1114 | qdisc_tree_reduce_backlog(old, qlen, backlog); |
86a7996c WC |
1115 | } |
1116 | sch_tree_unlock(sch); | |
1117 | ||
1118 | return old; | |
1119 | } | |
1120 | ||
1b5c5493 ED |
1121 | static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) |
1122 | { | |
1123 | rtnl_kfree_skbs(skb, skb); | |
1124 | qdisc_qstats_drop(sch); | |
1125 | } | |
1126 | ||
40bd0362 JF |
1127 | static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, |
1128 | struct sk_buff **to_free) | |
1129 | { | |
1130 | __qdisc_drop(skb, to_free); | |
1131 | qdisc_qstats_cpu_drop(sch); | |
1132 | ||
1133 | return NET_XMIT_DROP; | |
1134 | } | |
520ac30f ED |
1135 | |
1136 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, | |
1137 | struct sk_buff **to_free) | |
9972b25d | 1138 | { |
520ac30f | 1139 | __qdisc_drop(skb, to_free); |
25331d6c | 1140 | qdisc_qstats_drop(sch); |
9972b25d TG |
1141 | |
1142 | return NET_XMIT_DROP; | |
1143 | } | |
1144 | ||
35d889d1 AK |
1145 | static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, |
1146 | struct sk_buff **to_free) | |
1147 | { | |
1148 | __qdisc_drop_all(skb, to_free); | |
1149 | qdisc_qstats_drop(sch); | |
1150 | ||
1151 | return NET_XMIT_DROP; | |
1152 | } | |
1153 | ||
e9bef55d JDB |
1154 | /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how |
1155 | long it will take to send a packet given its size. | |
1156 | */ | |
1157 | static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen) | |
1158 | { | |
e08b0998 JDB |
1159 | int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead; |
1160 | if (slot < 0) | |
1161 | slot = 0; | |
e9bef55d JDB |
1162 | slot >>= rtab->rate.cell_log; |
1163 | if (slot > 255) | |
a02cec21 | 1164 | return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]; |
e9bef55d JDB |
1165 | return rtab->data[slot]; |
1166 | } | |
1167 | ||
292f1c7f | 1168 | struct psched_ratecfg { |
130d3d68 | 1169 | u64 rate_bytes_ps; /* bytes per second */ |
01cb71d2 ED |
1170 | u32 mult; |
1171 | u16 overhead; | |
8a8e3d84 | 1172 | u8 linklayer; |
01cb71d2 | 1173 | u8 shift; |
292f1c7f JP |
1174 | }; |
1175 | ||
1176 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, | |
1177 | unsigned int len) | |
1178 | { | |
8a8e3d84 JDB |
1179 | len += r->overhead; |
1180 | ||
1181 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) | |
1182 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; | |
1183 | ||
1184 | return ((u64)len * r->mult) >> r->shift; | |
292f1c7f JP |
1185 | } |
1186 | ||
5c15257f | 1187 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
3e1e3aae ED |
1188 | const struct tc_ratespec *conf, |
1189 | u64 rate64); | |
292f1c7f | 1190 | |
01cb71d2 ED |
1191 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
1192 | const struct psched_ratecfg *r) | |
292f1c7f | 1193 | { |
01cb71d2 | 1194 | memset(res, 0, sizeof(*res)); |
3e1e3aae ED |
1195 | |
1196 | /* legacy struct tc_ratespec has a 32bit @rate field | |
1197 | * Qdisc using 64bit rate should add new attributes | |
1198 | * in order to maintain compatibility. | |
1199 | */ | |
1200 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); | |
1201 | ||
01cb71d2 | 1202 | res->overhead = r->overhead; |
8a8e3d84 | 1203 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
292f1c7f JP |
1204 | } |
1205 | ||
46209401 JP |
1206 | /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. |
1207 | * The fast path only needs to access filter list and to update stats | |
1208 | */ | |
1209 | struct mini_Qdisc { | |
1210 | struct tcf_proto *filter_list; | |
1211 | struct gnet_stats_basic_cpu __percpu *cpu_bstats; | |
1212 | struct gnet_stats_queue __percpu *cpu_qstats; | |
1213 | struct rcu_head rcu; | |
1214 | }; | |
1215 | ||
1216 | static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, | |
1217 | const struct sk_buff *skb) | |
1218 | { | |
1219 | bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb); | |
1220 | } | |
1221 | ||
1222 | static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) | |
1223 | { | |
1224 | this_cpu_inc(miniq->cpu_qstats->drops); | |
1225 | } | |
1226 | ||
1227 | struct mini_Qdisc_pair { | |
1228 | struct mini_Qdisc miniq1; | |
1229 | struct mini_Qdisc miniq2; | |
1230 | struct mini_Qdisc __rcu **p_miniq; | |
1231 | }; | |
1232 | ||
1233 | void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, | |
1234 | struct tcf_proto *tp_head); | |
1235 | void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, | |
1236 | struct mini_Qdisc __rcu **p_miniq); | |
1237 | ||
cd11b164 PA |
1238 | static inline void skb_tc_reinsert(struct sk_buff *skb, struct tcf_result *res) |
1239 | { | |
1240 | struct gnet_stats_queue *stats = res->qstats; | |
1241 | int ret; | |
1242 | ||
1243 | if (res->ingress) | |
1244 | ret = netif_receive_skb(skb); | |
1245 | else | |
1246 | ret = dev_queue_xmit(skb); | |
1247 | if (ret && stats) | |
1248 | qstats_overlimit_inc(res->qstats); | |
1249 | } | |
1250 | ||
1da177e4 | 1251 | #endif |