1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef __NET_SCHED_GENERIC_H |
3 | #define __NET_SCHED_GENERIC_H |
4 | |
5 | #include <linux/netdevice.h> |
6 | #include <linux/types.h> |
7 | #include <linux/rcupdate.h> |
8 | #include <linux/pkt_sched.h> |
9 | #include <linux/pkt_cls.h> |
10 | #include <linux/percpu.h> |
11 | #include <linux/dynamic_queue_limits.h> |
12 | #include <linux/list.h> |
13 | #include <linux/refcount.h> |
14 | #include <linux/workqueue.h> |
15 | #include <linux/mutex.h> |
16 | #include <linux/rwsem.h> |
17 | #include <linux/atomic.h> |
18 | #include <linux/hashtable.h> |
19 | #include <net/gen_stats.h> |
20 | #include <net/rtnetlink.h> |
21 | #include <net/flow_offload.h> |
22 | |
23 | struct Qdisc_ops; |
24 | struct qdisc_walker; |
25 | struct tcf_walker; |
26 | struct module; |
27 | struct bpf_flow_keys; |
28 | |
29 | struct qdisc_rate_table { |
30 | struct tc_ratespec rate; |
31 | u32 data[256]; |
32 | struct qdisc_rate_table *next; |
33 | int refcnt; |
34 | }; |
35 | |
36 | enum qdisc_state_t { |
37 | __QDISC_STATE_SCHED, |
38 | __QDISC_STATE_DEACTIVATED, |
39 | __QDISC_STATE_MISSED, |
40 | __QDISC_STATE_DRAINING, |
41 | }; |
42 | |
43 | enum qdisc_state2_t { |
44 | /* Only for !TCQ_F_NOLOCK qdisc. Never access it directly. |
45 | * Use qdisc_run_begin/end() or qdisc_is_running() instead. |
46 | */ |
47 | __QDISC_STATE2_RUNNING, |
48 | }; |
49 | |
50 | #define QDISC_STATE_MISSED BIT(__QDISC_STATE_MISSED) |
51 | #define QDISC_STATE_DRAINING BIT(__QDISC_STATE_DRAINING) |
52 | |
53 | #define QDISC_STATE_NON_EMPTY (QDISC_STATE_MISSED | \ |
54 | QDISC_STATE_DRAINING) |
55 | |
56 | struct qdisc_size_table { |
57 | struct rcu_head rcu; |
58 | struct list_head list; |
59 | struct tc_sizespec szopts; |
60 | int refcnt; |
61 | u16 data[]; |
62 | }; |
63 | |
64 | /* similar to sk_buff_head, but skb->prev pointer is undefined. */ |
65 | struct qdisc_skb_head { |
66 | struct sk_buff *head; |
67 | struct sk_buff *tail; |
68 | __u32 qlen; |
69 | spinlock_t lock; |
70 | }; |
71 | |
72 | struct Qdisc { |
73 | int (*enqueue)(struct sk_buff *skb, |
74 | struct Qdisc *sch, |
75 | struct sk_buff **to_free); |
76 | struct sk_buff * (*dequeue)(struct Qdisc *sch); |
77 | unsigned int flags; |
78 | #define TCQ_F_BUILTIN 1 |
79 | #define TCQ_F_INGRESS 2 |
80 | #define TCQ_F_CAN_BYPASS 4 |
81 | #define TCQ_F_MQROOT 8 |
82 | #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for |
83 | * q->dev_queue : It can test |
84 | * netif_xmit_frozen_or_stopped() before |
85 | * dequeueing next packet. |
86 | * Its true for MQ/MQPRIO slaves, or non |
87 | * multiqueue device. |
88 | */ |
89 | #define TCQ_F_WARN_NONWC (1 << 16) |
90 | #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */ |
91 | #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : |
92 | * qdisc_tree_decrease_qlen() should stop. |
93 | */ |
94 | #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ |
95 | #define TCQ_F_NOLOCK 0x100 /* qdisc does not require locking */ |
96 | #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */ |
97 | u32 limit; |
98 | const struct Qdisc_ops *ops; |
99 | struct qdisc_size_table __rcu *stab; |
100 | struct hlist_node hash; |
101 | u32 handle; |
102 | u32 parent; |
103 | |
104 | struct netdev_queue *dev_queue; |
105 | |
106 | struct net_rate_estimator __rcu *rate_est; |
107 | struct gnet_stats_basic_sync __percpu *cpu_bstats; |
108 | struct gnet_stats_queue __percpu *cpu_qstats; |
109 | int pad; |
110 | refcount_t refcnt; |
111 | |
112 | /* |
113 | * For performance sake on SMP, we put highly modified fields at the end |
114 | */ |
115 | struct sk_buff_head gso_skb ____cacheline_aligned_in_smp; |
116 | struct qdisc_skb_head q; |
117 | struct gnet_stats_basic_sync bstats; |
118 | struct gnet_stats_queue qstats; |
119 | unsigned long state; |
120 | unsigned long state2; /* must be written under qdisc spinlock */ |
121 | struct Qdisc *next_sched; |
122 | struct sk_buff_head skb_bad_txq; |
123 | |
124 | spinlock_t busylock ____cacheline_aligned_in_smp; |
125 | spinlock_t seqlock; |
126 | |
127 | struct rcu_head rcu; |
128 | netdevice_tracker dev_tracker; |
129 | /* private data */ |
130 | long privdata[] ____cacheline_aligned; |
131 | }; |
132 | |
133 | static inline void qdisc_refcount_inc(struct Qdisc *qdisc) |
134 | { |
135 | if (qdisc->flags & TCQ_F_BUILTIN) |
136 | return; |
137 | refcount_inc(r: &qdisc->refcnt); |
138 | } |
139 | |
140 | static inline bool qdisc_refcount_dec_if_one(struct Qdisc *qdisc) |
141 | { |
142 | if (qdisc->flags & TCQ_F_BUILTIN) |
143 | return true; |
144 | return refcount_dec_if_one(r: &qdisc->refcnt); |
145 | } |
146 | |
147 | /* Intended to be used by unlocked users, when concurrent qdisc release is |
148 | * possible. |
149 | */ |
150 | |
151 | static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc) |
152 | { |
153 | if (qdisc->flags & TCQ_F_BUILTIN) |
154 | return qdisc; |
155 | if (refcount_inc_not_zero(r: &qdisc->refcnt)) |
156 | return qdisc; |
157 | return NULL; |
158 | } |
159 | |
160 | /* For !TCQ_F_NOLOCK qdisc: callers must either call this within a qdisc |
161 | * root_lock section, or provide their own memory barriers -- ordering |
162 | * against qdisc_run_begin/end() atomic bit operations. |
163 | */ |
164 | static inline bool qdisc_is_running(struct Qdisc *qdisc) |
165 | { |
166 | if (qdisc->flags & TCQ_F_NOLOCK) |
167 | return spin_is_locked(lock: &qdisc->seqlock); |
168 | return test_bit(__QDISC_STATE2_RUNNING, &qdisc->state2); |
169 | } |
170 | |
171 | static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc) |
172 | { |
173 | return !(READ_ONCE(qdisc->state) & QDISC_STATE_NON_EMPTY); |
174 | } |
175 | |
176 | static inline bool qdisc_is_percpu_stats(const struct Qdisc *q) |
177 | { |
178 | return q->flags & TCQ_F_CPUSTATS; |
179 | } |
180 | |
181 | static inline bool qdisc_is_empty(const struct Qdisc *qdisc) |
182 | { |
183 | if (qdisc_is_percpu_stats(q: qdisc)) |
184 | return nolock_qdisc_is_empty(qdisc); |
185 | return !READ_ONCE(qdisc->q.qlen); |
186 | } |
187 | |
188 | /* For !TCQ_F_NOLOCK qdisc, qdisc_run_begin/end() must be invoked with |
189 | * the qdisc root lock acquired. |
190 | */ |
191 | static inline bool qdisc_run_begin(struct Qdisc *qdisc) |
192 | { |
193 | if (qdisc->flags & TCQ_F_NOLOCK) { |
194 | if (spin_trylock(lock: &qdisc->seqlock)) |
195 | return true; |
196 | |
197 | /* No need to insist if the MISSED flag was already set. |
198 | * Note that test_and_set_bit() also gives us memory ordering |
199 | * guarantees wrt potential earlier enqueue() and below |
200 | * spin_trylock(), both of which are necessary to prevent races |
201 | */ |
202 | if (test_and_set_bit(nr: __QDISC_STATE_MISSED, addr: &qdisc->state)) |
203 | return false; |
204 | |
205 | /* Try to take the lock again to make sure that we will either |
206 | * grab it or the CPU that still has it will see MISSED set |
207 | * when testing it in qdisc_run_end() |
208 | */ |
209 | return spin_trylock(lock: &qdisc->seqlock); |
210 | } |
211 | return !__test_and_set_bit(__QDISC_STATE2_RUNNING, &qdisc->state2); |
212 | } |
213 | |
214 | static inline void qdisc_run_end(struct Qdisc *qdisc) |
215 | { |
216 | if (qdisc->flags & TCQ_F_NOLOCK) { |
217 | spin_unlock(lock: &qdisc->seqlock); |
218 | |
219 | /* spin_unlock() only has store-release semantic. The unlock |
220 | * and test_bit() ordering is a store-load ordering, so a full |
221 | * memory barrier is needed here. |
222 | */ |
223 | smp_mb(); |
224 | |
225 | if (unlikely(test_bit(__QDISC_STATE_MISSED, |
226 | &qdisc->state))) |
227 | __netif_schedule(q: qdisc); |
228 | } else { |
229 | __clear_bit(__QDISC_STATE2_RUNNING, &qdisc->state2); |
230 | } |
231 | } |
232 | |
233 | static inline bool qdisc_may_bulk(const struct Qdisc *qdisc) |
234 | { |
235 | return qdisc->flags & TCQ_F_ONETXQUEUE; |
236 | } |
237 | |
238 | static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq) |
239 | { |
240 | #ifdef CONFIG_BQL |
241 | /* Non-BQL migrated drivers will return 0, too. */ |
242 | return dql_avail(dql: &txq->dql); |
243 | #else |
244 | return 0; |
245 | #endif |
246 | } |
247 | |
248 | struct Qdisc_class_ops { |
249 | unsigned int flags; |
250 | /* Child qdisc manipulation */ |
251 | struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *); |
252 | int (*graft)(struct Qdisc *, unsigned long cl, |
253 | struct Qdisc *, struct Qdisc **, |
254 | struct netlink_ext_ack *extack); |
255 | struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl); |
256 | void (*qlen_notify)(struct Qdisc *, unsigned long); |
257 | |
258 | /* Class manipulation routines */ |
259 | unsigned long (*find)(struct Qdisc *, u32 classid); |
260 | int (*change)(struct Qdisc *, u32, u32, |
261 | struct nlattr **, unsigned long *, |
262 | struct netlink_ext_ack *); |
263 | int (*delete)(struct Qdisc *, unsigned long, |
264 | struct netlink_ext_ack *); |
265 | void (*walk)(struct Qdisc *, struct qdisc_walker * arg); |
266 | |
267 | /* Filter manipulation */ |
268 | struct tcf_block * (*tcf_block)(struct Qdisc *sch, |
269 | unsigned long arg, |
270 | struct netlink_ext_ack *extack); |
271 | unsigned long (*bind_tcf)(struct Qdisc *, unsigned long, |
272 | u32 classid); |
273 | void (*unbind_tcf)(struct Qdisc *, unsigned long); |
274 | |
275 | /* rtnetlink specific */ |
276 | int (*dump)(struct Qdisc *, unsigned long, |
277 | struct sk_buff *skb, struct tcmsg*); |
278 | int (*dump_stats)(struct Qdisc *, unsigned long, |
279 | struct gnet_dump *); |
280 | }; |
281 | |
282 | /* Qdisc_class_ops flag values */ |
283 | |
284 | /* Implements API that doesn't require rtnl lock */ |
285 | enum qdisc_class_ops_flags { |
286 | QDISC_CLASS_OPS_DOIT_UNLOCKED = 1, |
287 | }; |
288 | |
289 | struct Qdisc_ops { |
290 | struct Qdisc_ops *next; |
291 | const struct Qdisc_class_ops *cl_ops; |
292 | char id[IFNAMSIZ]; |
293 | int priv_size; |
294 | unsigned int static_flags; |
295 | |
296 | int (*enqueue)(struct sk_buff *skb, |
297 | struct Qdisc *sch, |
298 | struct sk_buff **to_free); |
299 | struct sk_buff * (*dequeue)(struct Qdisc *); |
300 | struct sk_buff * (*peek)(struct Qdisc *); |
301 | |
302 | int (*init)(struct Qdisc *sch, struct nlattr *arg, |
303 | struct netlink_ext_ack *extack); |
304 | void (*reset)(struct Qdisc *); |
305 | void (*destroy)(struct Qdisc *); |
306 | int (*change)(struct Qdisc *sch, |
307 | struct nlattr *arg, |
308 | struct netlink_ext_ack *extack); |
309 | void (*attach)(struct Qdisc *sch); |
310 | int (*change_tx_queue_len)(struct Qdisc *, unsigned int); |
311 | void (*change_real_num_tx)(struct Qdisc *sch, |
312 | unsigned int new_real_tx); |
313 | |
314 | int (*dump)(struct Qdisc *, struct sk_buff *); |
315 | int (*dump_stats)(struct Qdisc *, struct gnet_dump *); |
316 | |
317 | void (*ingress_block_set)(struct Qdisc *sch, |
318 | u32 block_index); |
319 | void (*egress_block_set)(struct Qdisc *sch, |
320 | u32 block_index); |
321 | u32 (*ingress_block_get)(struct Qdisc *sch); |
322 | u32 (*egress_block_get)(struct Qdisc *sch); |
323 | |
324 | struct module *owner; |
325 | }; |
326 | |
327 | struct tcf_result { |
328 | union { |
329 | struct { |
330 | unsigned long class; |
331 | u32 classid; |
332 | }; |
333 | const struct tcf_proto *goto_tp; |
334 | }; |
335 | enum skb_drop_reason drop_reason; |
336 | }; |
337 | |
338 | struct tcf_chain; |
339 | |
340 | struct tcf_proto_ops { |
341 | struct list_head head; |
342 | char kind[IFNAMSIZ]; |
343 | |
344 | int (*classify)(struct sk_buff *, |
345 | const struct tcf_proto *, |
346 | struct tcf_result *); |
347 | int (*init)(struct tcf_proto*); |
348 | void (*destroy)(struct tcf_proto *tp, bool rtnl_held, |
349 | struct netlink_ext_ack *extack); |
350 | |
351 | void* (*get)(struct tcf_proto*, u32 handle); |
352 | void (*put)(struct tcf_proto *tp, void *f); |
353 | int (*change)(struct net *net, struct sk_buff *, |
354 | struct tcf_proto*, unsigned long, |
355 | u32 handle, struct nlattr **, |
356 | void **, u32, |
357 | struct netlink_ext_ack *); |
358 | int (*delete)(struct tcf_proto *tp, void *arg, |
359 | bool *last, bool rtnl_held, |
360 | struct netlink_ext_ack *); |
361 | bool (*delete_empty)(struct tcf_proto *tp); |
362 | void (*walk)(struct tcf_proto *tp, |
363 | struct tcf_walker *arg, bool rtnl_held); |
364 | int (*reoffload)(struct tcf_proto *tp, bool add, |
365 | flow_setup_cb_t *cb, void *cb_priv, |
366 | struct netlink_ext_ack *extack); |
367 | void (*hw_add)(struct tcf_proto *tp, |
368 | void *type_data); |
369 | void (*hw_del)(struct tcf_proto *tp, |
370 | void *type_data); |
371 | void (*bind_class)(void *, u32, unsigned long, |
372 | void *, unsigned long); |
373 | void * (*tmplt_create)(struct net *net, |
374 | struct tcf_chain *chain, |
375 | struct nlattr **tca, |
376 | struct netlink_ext_ack *extack); |
377 | void (*tmplt_destroy)(void *tmplt_priv); |
378 | struct tcf_exts * (*get_exts)(const struct tcf_proto *tp, |
379 | u32 handle); |
380 | |
381 | /* rtnetlink specific */ |
382 | int (*dump)(struct net*, struct tcf_proto*, void *, |
383 | struct sk_buff *skb, struct tcmsg*, |
384 | bool); |
385 | int (*terse_dump)(struct net *net, |
386 | struct tcf_proto *tp, void *fh, |
387 | struct sk_buff *skb, |
388 | struct tcmsg *t, bool rtnl_held); |
389 | int (*tmplt_dump)(struct sk_buff *skb, |
390 | struct net *net, |
391 | void *tmplt_priv); |
392 | |
393 | struct module *owner; |
394 | int flags; |
395 | }; |
396 | |
397 | /* Classifiers setting TCF_PROTO_OPS_DOIT_UNLOCKED in tcf_proto_ops->flags |
398 | * are expected to implement tcf_proto_ops->delete_empty(), otherwise race |
399 | * conditions can occur when filters are inserted/deleted simultaneously. |
400 | */ |
401 | enum tcf_proto_ops_flags { |
402 | TCF_PROTO_OPS_DOIT_UNLOCKED = 1, |
403 | }; |
404 | |
405 | struct tcf_proto { |
406 | /* Fast access part */ |
407 | struct tcf_proto __rcu *next; |
408 | void __rcu *root; |
409 | |
410 | /* called under RCU BH lock*/ |
411 | int (*classify)(struct sk_buff *, |
412 | const struct tcf_proto *, |
413 | struct tcf_result *); |
414 | __be16 protocol; |
415 | |
416 | /* All the rest */ |
417 | u32 prio; |
418 | void *data; |
419 | const struct tcf_proto_ops *ops; |
420 | struct tcf_chain *chain; |
421 | /* Lock protects tcf_proto shared state and can be used by unlocked |
422 | * classifiers to protect their private data. |
423 | */ |
424 | spinlock_t lock; |
425 | bool deleting; |
426 | refcount_t refcnt; |
427 | struct rcu_head rcu; |
428 | struct hlist_node destroy_ht_node; |
429 | }; |
430 | |
431 | struct qdisc_skb_cb { |
432 | struct { |
433 | unsigned int pkt_len; |
434 | u16 slave_dev_queue_mapping; |
435 | u16 tc_classid; |
436 | }; |
437 | #define QDISC_CB_PRIV_LEN 20 |
438 | unsigned char data[QDISC_CB_PRIV_LEN]; |
439 | }; |
440 | |
441 | typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv); |
442 | |
443 | struct tcf_chain { |
444 | /* Protects filter_chain. */ |
445 | struct mutex filter_chain_lock; |
446 | struct tcf_proto __rcu *filter_chain; |
447 | struct list_head list; |
448 | struct tcf_block *block; |
449 | u32 index; /* chain index */ |
450 | unsigned int refcnt; |
451 | unsigned int action_refcnt; |
452 | bool explicitly_created; |
453 | bool flushing; |
454 | const struct tcf_proto_ops *tmplt_ops; |
455 | void *tmplt_priv; |
456 | struct rcu_head rcu; |
457 | }; |
458 | |
459 | struct tcf_block { |
460 | /* Lock protects tcf_block and lifetime-management data of chains |
461 | * attached to the block (refcnt, action_refcnt, explicitly_created). |
462 | */ |
463 | struct mutex lock; |
464 | struct list_head chain_list; |
465 | u32 index; /* block index for shared blocks */ |
466 | u32 classid; /* which class this block belongs to */ |
467 | refcount_t refcnt; |
468 | struct net *net; |
469 | struct Qdisc *q; |
470 | struct rw_semaphore cb_lock; /* protects cb_list and offload counters */ |
471 | struct flow_block flow_block; |
472 | struct list_head owner_list; |
473 | bool keep_dst; |
474 | atomic_t offloadcnt; /* Number of oddloaded filters */ |
475 | unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */ |
476 | unsigned int lockeddevcnt; /* Number of devs that require rtnl lock. */ |
477 | struct { |
478 | struct tcf_chain *chain; |
479 | struct list_head filter_chain_list; |
480 | } chain0; |
481 | struct rcu_head rcu; |
482 | DECLARE_HASHTABLE(proto_destroy_ht, 7); |
483 | struct mutex proto_destroy_lock; /* Lock for proto_destroy hashtable. */ |
484 | }; |
485 | |
486 | static inline bool lockdep_tcf_chain_is_locked(struct tcf_chain *chain) |
487 | { |
488 | return lockdep_is_held(&chain->filter_chain_lock); |
489 | } |
490 | |
491 | static inline bool lockdep_tcf_proto_is_locked(struct tcf_proto *tp) |
492 | { |
493 | return lockdep_is_held(&tp->lock); |
494 | } |
495 | |
496 | #define tcf_chain_dereference(p, chain) \ |
497 | rcu_dereference_protected(p, lockdep_tcf_chain_is_locked(chain)) |
498 | |
499 | #define tcf_proto_dereference(p, tp) \ |
500 | rcu_dereference_protected(p, lockdep_tcf_proto_is_locked(tp)) |
501 | |
502 | static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz) |
503 | { |
504 | struct qdisc_skb_cb *qcb; |
505 | |
506 | BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*qcb)); |
507 | BUILD_BUG_ON(sizeof(qcb->data) < sz); |
508 | } |
509 | |
510 | static inline int qdisc_qlen(const struct Qdisc *q) |
511 | { |
512 | return q->q.qlen; |
513 | } |
514 | |
515 | static inline int qdisc_qlen_sum(const struct Qdisc *q) |
516 | { |
517 | __u32 qlen = q->qstats.qlen; |
518 | int i; |
519 | |
520 | if (qdisc_is_percpu_stats(q)) { |
521 | for_each_possible_cpu(i) |
522 | qlen += per_cpu_ptr(q->cpu_qstats, i)->qlen; |
523 | } else { |
524 | qlen += q->q.qlen; |
525 | } |
526 | |
527 | return qlen; |
528 | } |
529 | |
530 | static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb) |
531 | { |
532 | return (struct qdisc_skb_cb *)skb->cb; |
533 | } |
534 | |
535 | static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc) |
536 | { |
537 | return &qdisc->q.lock; |
538 | } |
539 | |
540 | static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc) |
541 | { |
542 | struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc); |
543 | |
544 | return q; |
545 | } |
546 | |
547 | static inline struct Qdisc *qdisc_root_bh(const struct Qdisc *qdisc) |
548 | { |
549 | return rcu_dereference_bh(qdisc->dev_queue->qdisc); |
550 | } |
551 | |
552 | static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc) |
553 | { |
554 | return rcu_dereference_rtnl(qdisc->dev_queue->qdisc_sleeping); |
555 | } |
556 | |
557 | static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc) |
558 | { |
559 | struct Qdisc *root = qdisc_root_sleeping(qdisc); |
560 | |
561 | ASSERT_RTNL(); |
562 | return qdisc_lock(qdisc: root); |
563 | } |
564 | |
565 | static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc) |
566 | { |
567 | return qdisc->dev_queue->dev; |
568 | } |
569 | |
570 | static inline void sch_tree_lock(struct Qdisc *q) |
571 | { |
572 | if (q->flags & TCQ_F_MQROOT) |
573 | spin_lock_bh(lock: qdisc_lock(qdisc: q)); |
574 | else |
575 | spin_lock_bh(lock: qdisc_root_sleeping_lock(qdisc: q)); |
576 | } |
577 | |
578 | static inline void sch_tree_unlock(struct Qdisc *q) |
579 | { |
580 | if (q->flags & TCQ_F_MQROOT) |
581 | spin_unlock_bh(lock: qdisc_lock(qdisc: q)); |
582 | else |
583 | spin_unlock_bh(lock: qdisc_root_sleeping_lock(qdisc: q)); |
584 | } |
585 | |
586 | extern struct Qdisc noop_qdisc; |
587 | extern struct Qdisc_ops noop_qdisc_ops; |
588 | extern struct Qdisc_ops pfifo_fast_ops; |
589 | extern const u8 sch_default_prio2band[TC_PRIO_MAX + 1]; |
590 | extern struct Qdisc_ops mq_qdisc_ops; |
591 | extern struct Qdisc_ops noqueue_qdisc_ops; |
592 | extern const struct Qdisc_ops *default_qdisc_ops; |
593 | static inline const struct Qdisc_ops * |
594 | get_default_qdisc_ops(const struct net_device *dev, int ntx) |
595 | { |
596 | return ntx < dev->real_num_tx_queues ? |
597 | default_qdisc_ops : &pfifo_fast_ops; |
598 | } |
599 | |
600 | struct Qdisc_class_common { |
601 | u32 classid; |
602 | unsigned int filter_cnt; |
603 | struct hlist_node hnode; |
604 | }; |
605 | |
606 | struct Qdisc_class_hash { |
607 | struct hlist_head *hash; |
608 | unsigned int hashsize; |
609 | unsigned int hashmask; |
610 | unsigned int hashelems; |
611 | }; |
612 | |
613 | static inline unsigned int qdisc_class_hash(u32 id, u32 mask) |
614 | { |
615 | id ^= id >> 8; |
616 | id ^= id >> 4; |
617 | return id & mask; |
618 | } |
619 | |
620 | static inline struct Qdisc_class_common * |
621 | qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id) |
622 | { |
623 | struct Qdisc_class_common *cl; |
624 | unsigned int h; |
625 | |
626 | if (!id) |
627 | return NULL; |
628 | |
629 | h = qdisc_class_hash(id, mask: hash->hashmask); |
630 | hlist_for_each_entry(cl, &hash->hash[h], hnode) { |
631 | if (cl->classid == id) |
632 | return cl; |
633 | } |
634 | return NULL; |
635 | } |
636 | |
637 | static inline bool qdisc_class_in_use(const struct Qdisc_class_common *cl) |
638 | { |
639 | return cl->filter_cnt > 0; |
640 | } |
641 | |
642 | static inline void qdisc_class_get(struct Qdisc_class_common *cl) |
643 | { |
644 | unsigned int res; |
645 | |
646 | if (check_add_overflow(cl->filter_cnt, 1, &res)) |
647 | WARN(1, "Qdisc class overflow" ); |
648 | |
649 | cl->filter_cnt = res; |
650 | } |
651 | |
652 | static inline void qdisc_class_put(struct Qdisc_class_common *cl) |
653 | { |
654 | unsigned int res; |
655 | |
656 | if (check_sub_overflow(cl->filter_cnt, 1, &res)) |
657 | WARN(1, "Qdisc class underflow" ); |
658 | |
659 | cl->filter_cnt = res; |
660 | } |
661 | |
662 | static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid) |
663 | { |
664 | u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY; |
665 | |
666 | return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL; |
667 | } |
668 | |
669 | int qdisc_class_hash_init(struct Qdisc_class_hash *); |
670 | void qdisc_class_hash_insert(struct Qdisc_class_hash *, |
671 | struct Qdisc_class_common *); |
672 | void qdisc_class_hash_remove(struct Qdisc_class_hash *, |
673 | struct Qdisc_class_common *); |
674 | void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *); |
675 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *); |
676 | |
677 | int dev_qdisc_change_tx_queue_len(struct net_device *dev); |
678 | void dev_qdisc_change_real_num_tx(struct net_device *dev, |
679 | unsigned int new_real_tx); |
680 | void dev_init_scheduler(struct net_device *dev); |
681 | void dev_shutdown(struct net_device *dev); |
682 | void dev_activate(struct net_device *dev); |
683 | void dev_deactivate(struct net_device *dev); |
684 | void dev_deactivate_many(struct list_head *head); |
685 | struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, |
686 | struct Qdisc *qdisc); |
687 | void qdisc_reset(struct Qdisc *qdisc); |
688 | void qdisc_destroy(struct Qdisc *qdisc); |
689 | void qdisc_put(struct Qdisc *qdisc); |
690 | void qdisc_put_unlocked(struct Qdisc *qdisc); |
691 | void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, int n, int len); |
692 | #ifdef CONFIG_NET_SCHED |
693 | int qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, |
694 | void *type_data); |
695 | void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, |
696 | struct Qdisc *new, struct Qdisc *old, |
697 | enum tc_setup_type type, void *type_data, |
698 | struct netlink_ext_ack *extack); |
699 | #else |
700 | static inline int |
701 | qdisc_offload_dump_helper(struct Qdisc *q, enum tc_setup_type type, |
702 | void *type_data) |
703 | { |
704 | q->flags &= ~TCQ_F_OFFLOADED; |
705 | return 0; |
706 | } |
707 | |
708 | static inline void |
709 | qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch, |
710 | struct Qdisc *new, struct Qdisc *old, |
711 | enum tc_setup_type type, void *type_data, |
712 | struct netlink_ext_ack *extack) |
713 | { |
714 | } |
715 | #endif |
716 | void qdisc_offload_query_caps(struct net_device *dev, |
717 | enum tc_setup_type type, |
718 | void *caps, size_t caps_len); |
719 | struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue, |
720 | const struct Qdisc_ops *ops, |
721 | struct netlink_ext_ack *extack); |
722 | void qdisc_free(struct Qdisc *qdisc); |
723 | struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue, |
724 | const struct Qdisc_ops *ops, u32 parentid, |
725 | struct netlink_ext_ack *extack); |
726 | void __qdisc_calculate_pkt_len(struct sk_buff *skb, |
727 | const struct qdisc_size_table *stab); |
728 | int skb_do_redirect(struct sk_buff *); |
729 | |
730 | static inline bool skb_at_tc_ingress(const struct sk_buff *skb) |
731 | { |
732 | #ifdef CONFIG_NET_XGRESS |
733 | return skb->tc_at_ingress; |
734 | #else |
735 | return false; |
736 | #endif |
737 | } |
738 | |
739 | static inline bool skb_skip_tc_classify(struct sk_buff *skb) |
740 | { |
741 | #ifdef CONFIG_NET_CLS_ACT |
742 | if (skb->tc_skip_classify) { |
743 | skb->tc_skip_classify = 0; |
744 | return true; |
745 | } |
746 | #endif |
747 | return false; |
748 | } |
749 | |
750 | /* Reset all TX qdiscs greater than index of a device. */ |
751 | static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i) |
752 | { |
753 | struct Qdisc *qdisc; |
754 | |
755 | for (; i < dev->num_tx_queues; i++) { |
756 | qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc); |
757 | if (qdisc) { |
758 | spin_lock_bh(lock: qdisc_lock(qdisc)); |
759 | qdisc_reset(qdisc); |
760 | spin_unlock_bh(lock: qdisc_lock(qdisc)); |
761 | } |
762 | } |
763 | } |
764 | |
765 | /* Are all TX queues of the device empty? */ |
766 | static inline bool qdisc_all_tx_empty(const struct net_device *dev) |
767 | { |
768 | unsigned int i; |
769 | |
770 | rcu_read_lock(); |
771 | for (i = 0; i < dev->num_tx_queues; i++) { |
772 | struct netdev_queue *txq = netdev_get_tx_queue(dev, index: i); |
773 | const struct Qdisc *q = rcu_dereference(txq->qdisc); |
774 | |
775 | if (!qdisc_is_empty(qdisc: q)) { |
776 | rcu_read_unlock(); |
777 | return false; |
778 | } |
779 | } |
780 | rcu_read_unlock(); |
781 | return true; |
782 | } |
783 | |
784 | /* Are any of the TX qdiscs changing? */ |
785 | static inline bool qdisc_tx_changing(const struct net_device *dev) |
786 | { |
787 | unsigned int i; |
788 | |
789 | for (i = 0; i < dev->num_tx_queues; i++) { |
790 | struct netdev_queue *txq = netdev_get_tx_queue(dev, index: i); |
791 | |
792 | if (rcu_access_pointer(txq->qdisc) != |
793 | rcu_access_pointer(txq->qdisc_sleeping)) |
794 | return true; |
795 | } |
796 | return false; |
797 | } |
798 | |
799 | /* Is the device using the noop qdisc on all queues? */ |
800 | static inline bool qdisc_tx_is_noop(const struct net_device *dev) |
801 | { |
802 | unsigned int i; |
803 | |
804 | for (i = 0; i < dev->num_tx_queues; i++) { |
805 | struct netdev_queue *txq = netdev_get_tx_queue(dev, index: i); |
806 | if (rcu_access_pointer(txq->qdisc) != &noop_qdisc) |
807 | return false; |
808 | } |
809 | return true; |
810 | } |
811 | |
812 | static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb) |
813 | { |
814 | return qdisc_skb_cb(skb)->pkt_len; |
815 | } |
816 | |
817 | /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */ |
818 | enum net_xmit_qdisc_t { |
819 | __NET_XMIT_STOLEN = 0x00010000, |
820 | __NET_XMIT_BYPASS = 0x00020000, |
821 | }; |
822 | |
823 | #ifdef CONFIG_NET_CLS_ACT |
824 | #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1) |
825 | #else |
826 | #define net_xmit_drop_count(e) (1) |
827 | #endif |
828 | |
829 | static inline void qdisc_calculate_pkt_len(struct sk_buff *skb, |
830 | const struct Qdisc *sch) |
831 | { |
832 | #ifdef CONFIG_NET_SCHED |
833 | struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab); |
834 | |
835 | if (stab) |
836 | __qdisc_calculate_pkt_len(skb, stab); |
837 | #endif |
838 | } |
839 | |
840 | static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
841 | struct sk_buff **to_free) |
842 | { |
843 | qdisc_calculate_pkt_len(skb, sch); |
844 | return sch->enqueue(skb, sch, to_free); |
845 | } |
846 | |
847 | static inline void _bstats_update(struct gnet_stats_basic_sync *bstats, |
848 | __u64 bytes, __u32 packets) |
849 | { |
850 | u64_stats_update_begin(syncp: &bstats->syncp); |
851 | u64_stats_add(p: &bstats->bytes, val: bytes); |
852 | u64_stats_add(p: &bstats->packets, val: packets); |
853 | u64_stats_update_end(syncp: &bstats->syncp); |
854 | } |
855 | |
856 | static inline void bstats_update(struct gnet_stats_basic_sync *bstats, |
857 | const struct sk_buff *skb) |
858 | { |
859 | _bstats_update(bstats, |
860 | bytes: qdisc_pkt_len(skb), |
861 | packets: skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1); |
862 | } |
863 | |
864 | static inline void qdisc_bstats_cpu_update(struct Qdisc *sch, |
865 | const struct sk_buff *skb) |
866 | { |
867 | bstats_update(this_cpu_ptr(sch->cpu_bstats), skb); |
868 | } |
869 | |
870 | static inline void qdisc_bstats_update(struct Qdisc *sch, |
871 | const struct sk_buff *skb) |
872 | { |
873 | bstats_update(bstats: &sch->bstats, skb); |
874 | } |
875 | |
876 | static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch, |
877 | const struct sk_buff *skb) |
878 | { |
879 | sch->qstats.backlog -= qdisc_pkt_len(skb); |
880 | } |
881 | |
882 | static inline void qdisc_qstats_cpu_backlog_dec(struct Qdisc *sch, |
883 | const struct sk_buff *skb) |
884 | { |
885 | this_cpu_sub(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); |
886 | } |
887 | |
888 | static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch, |
889 | const struct sk_buff *skb) |
890 | { |
891 | sch->qstats.backlog += qdisc_pkt_len(skb); |
892 | } |
893 | |
894 | static inline void qdisc_qstats_cpu_backlog_inc(struct Qdisc *sch, |
895 | const struct sk_buff *skb) |
896 | { |
897 | this_cpu_add(sch->cpu_qstats->backlog, qdisc_pkt_len(skb)); |
898 | } |
899 | |
900 | static inline void qdisc_qstats_cpu_qlen_inc(struct Qdisc *sch) |
901 | { |
902 | this_cpu_inc(sch->cpu_qstats->qlen); |
903 | } |
904 | |
905 | static inline void qdisc_qstats_cpu_qlen_dec(struct Qdisc *sch) |
906 | { |
907 | this_cpu_dec(sch->cpu_qstats->qlen); |
908 | } |
909 | |
910 | static inline void qdisc_qstats_cpu_requeues_inc(struct Qdisc *sch) |
911 | { |
912 | this_cpu_inc(sch->cpu_qstats->requeues); |
913 | } |
914 | |
915 | static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count) |
916 | { |
917 | sch->qstats.drops += count; |
918 | } |
919 | |
920 | static inline void qstats_drop_inc(struct gnet_stats_queue *qstats) |
921 | { |
922 | qstats->drops++; |
923 | } |
924 | |
925 | static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats) |
926 | { |
927 | qstats->overlimits++; |
928 | } |
929 | |
930 | static inline void qdisc_qstats_drop(struct Qdisc *sch) |
931 | { |
932 | qstats_drop_inc(qstats: &sch->qstats); |
933 | } |
934 | |
935 | static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch) |
936 | { |
937 | this_cpu_inc(sch->cpu_qstats->drops); |
938 | } |
939 | |
940 | static inline void qdisc_qstats_overlimit(struct Qdisc *sch) |
941 | { |
942 | sch->qstats.overlimits++; |
943 | } |
944 | |
945 | static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch) |
946 | { |
947 | __u32 qlen = qdisc_qlen_sum(q: sch); |
948 | |
949 | return gnet_stats_copy_queue(d, cpu_q: sch->cpu_qstats, q: &sch->qstats, qlen); |
950 | } |
951 | |
952 | static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen, |
953 | __u32 *backlog) |
954 | { |
955 | struct gnet_stats_queue qstats = { 0 }; |
956 | |
957 | gnet_stats_add_queue(qstats: &qstats, cpu_q: sch->cpu_qstats, q: &sch->qstats); |
958 | *qlen = qstats.qlen + qdisc_qlen(q: sch); |
959 | *backlog = qstats.backlog; |
960 | } |
961 | |
962 | static inline void qdisc_tree_flush_backlog(struct Qdisc *sch) |
963 | { |
964 | __u32 qlen, backlog; |
965 | |
966 | qdisc_qstats_qlen_backlog(sch, qlen: &qlen, backlog: &backlog); |
967 | qdisc_tree_reduce_backlog(qdisc: sch, n: qlen, len: backlog); |
968 | } |
969 | |
970 | static inline void qdisc_purge_queue(struct Qdisc *sch) |
971 | { |
972 | __u32 qlen, backlog; |
973 | |
974 | qdisc_qstats_qlen_backlog(sch, qlen: &qlen, backlog: &backlog); |
975 | qdisc_reset(qdisc: sch); |
976 | qdisc_tree_reduce_backlog(qdisc: sch, n: qlen, len: backlog); |
977 | } |
978 | |
979 | static inline void __qdisc_enqueue_tail(struct sk_buff *skb, |
980 | struct qdisc_skb_head *qh) |
981 | { |
982 | struct sk_buff *last = qh->tail; |
983 | |
984 | if (last) { |
985 | skb->next = NULL; |
986 | last->next = skb; |
987 | qh->tail = skb; |
988 | } else { |
989 | qh->tail = skb; |
990 | qh->head = skb; |
991 | } |
992 | qh->qlen++; |
993 | } |
994 | |
995 | static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch) |
996 | { |
997 | __qdisc_enqueue_tail(skb, qh: &sch->q); |
998 | qdisc_qstats_backlog_inc(sch, skb); |
999 | return NET_XMIT_SUCCESS; |
1000 | } |
1001 | |
1002 | static inline void __qdisc_enqueue_head(struct sk_buff *skb, |
1003 | struct qdisc_skb_head *qh) |
1004 | { |
1005 | skb->next = qh->head; |
1006 | |
1007 | if (!qh->head) |
1008 | qh->tail = skb; |
1009 | qh->head = skb; |
1010 | qh->qlen++; |
1011 | } |
1012 | |
1013 | static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh) |
1014 | { |
1015 | struct sk_buff *skb = qh->head; |
1016 | |
1017 | if (likely(skb != NULL)) { |
1018 | qh->head = skb->next; |
1019 | qh->qlen--; |
1020 | if (qh->head == NULL) |
1021 | qh->tail = NULL; |
1022 | skb->next = NULL; |
1023 | } |
1024 | |
1025 | return skb; |
1026 | } |
1027 | |
1028 | static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch) |
1029 | { |
1030 | struct sk_buff *skb = __qdisc_dequeue_head(qh: &sch->q); |
1031 | |
1032 | if (likely(skb != NULL)) { |
1033 | qdisc_qstats_backlog_dec(sch, skb); |
1034 | qdisc_bstats_update(sch, skb); |
1035 | } |
1036 | |
1037 | return skb; |
1038 | } |
1039 | |
1040 | /* Instead of calling kfree_skb() while root qdisc lock is held, |
1041 | * queue the skb for future freeing at end of __dev_xmit_skb() |
1042 | */ |
1043 | static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free) |
1044 | { |
1045 | skb->next = *to_free; |
1046 | *to_free = skb; |
1047 | } |
1048 | |
1049 | static inline void __qdisc_drop_all(struct sk_buff *skb, |
1050 | struct sk_buff **to_free) |
1051 | { |
1052 | if (skb->prev) |
1053 | skb->prev->next = *to_free; |
1054 | else |
1055 | skb->next = *to_free; |
1056 | *to_free = skb; |
1057 | } |
1058 | |
1059 | static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch, |
1060 | struct qdisc_skb_head *qh, |
1061 | struct sk_buff **to_free) |
1062 | { |
1063 | struct sk_buff *skb = __qdisc_dequeue_head(qh); |
1064 | |
1065 | if (likely(skb != NULL)) { |
1066 | unsigned int len = qdisc_pkt_len(skb); |
1067 | |
1068 | qdisc_qstats_backlog_dec(sch, skb); |
1069 | __qdisc_drop(skb, to_free); |
1070 | return len; |
1071 | } |
1072 | |
1073 | return 0; |
1074 | } |
1075 | |
1076 | static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch) |
1077 | { |
1078 | const struct qdisc_skb_head *qh = &sch->q; |
1079 | |
1080 | return qh->head; |
1081 | } |
1082 | |
1083 | /* generic pseudo peek method for non-work-conserving qdisc */ |
1084 | static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch) |
1085 | { |
1086 | struct sk_buff *skb = skb_peek(list_: &sch->gso_skb); |
1087 | |
1088 | /* we can reuse ->gso_skb because peek isn't called for root qdiscs */ |
1089 | if (!skb) { |
1090 | skb = sch->dequeue(sch); |
1091 | |
1092 | if (skb) { |
1093 | __skb_queue_head(list: &sch->gso_skb, newsk: skb); |
1094 | /* it's still part of the queue */ |
1095 | qdisc_qstats_backlog_inc(sch, skb); |
1096 | sch->q.qlen++; |
1097 | } |
1098 | } |
1099 | |
1100 | return skb; |
1101 | } |
1102 | |
1103 | static inline void qdisc_update_stats_at_dequeue(struct Qdisc *sch, |
1104 | struct sk_buff *skb) |
1105 | { |
1106 | if (qdisc_is_percpu_stats(q: sch)) { |
1107 | qdisc_qstats_cpu_backlog_dec(sch, skb); |
1108 | qdisc_bstats_cpu_update(sch, skb); |
1109 | qdisc_qstats_cpu_qlen_dec(sch); |
1110 | } else { |
1111 | qdisc_qstats_backlog_dec(sch, skb); |
1112 | qdisc_bstats_update(sch, skb); |
1113 | sch->q.qlen--; |
1114 | } |
1115 | } |
1116 | |
1117 | static inline void qdisc_update_stats_at_enqueue(struct Qdisc *sch, |
1118 | unsigned int pkt_len) |
1119 | { |
1120 | if (qdisc_is_percpu_stats(q: sch)) { |
1121 | qdisc_qstats_cpu_qlen_inc(sch); |
1122 | this_cpu_add(sch->cpu_qstats->backlog, pkt_len); |
1123 | } else { |
1124 | sch->qstats.backlog += pkt_len; |
1125 | sch->q.qlen++; |
1126 | } |
1127 | } |
1128 | |
1129 | /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */ |
1130 | static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch) |
1131 | { |
1132 | struct sk_buff *skb = skb_peek(list_: &sch->gso_skb); |
1133 | |
1134 | if (skb) { |
1135 | skb = __skb_dequeue(list: &sch->gso_skb); |
1136 | if (qdisc_is_percpu_stats(q: sch)) { |
1137 | qdisc_qstats_cpu_backlog_dec(sch, skb); |
1138 | qdisc_qstats_cpu_qlen_dec(sch); |
1139 | } else { |
1140 | qdisc_qstats_backlog_dec(sch, skb); |
1141 | sch->q.qlen--; |
1142 | } |
1143 | } else { |
1144 | skb = sch->dequeue(sch); |
1145 | } |
1146 | |
1147 | return skb; |
1148 | } |
1149 | |
1150 | static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh) |
1151 | { |
1152 | /* |
1153 | * We do not know the backlog in bytes of this list, it |
1154 | * is up to the caller to correct it |
1155 | */ |
1156 | ASSERT_RTNL(); |
1157 | if (qh->qlen) { |
1158 | rtnl_kfree_skbs(head: qh->head, tail: qh->tail); |
1159 | |
1160 | qh->head = NULL; |
1161 | qh->tail = NULL; |
1162 | qh->qlen = 0; |
1163 | } |
1164 | } |
1165 | |
1166 | static inline void qdisc_reset_queue(struct Qdisc *sch) |
1167 | { |
1168 | __qdisc_reset_queue(qh: &sch->q); |
1169 | } |
1170 | |
1171 | static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new, |
1172 | struct Qdisc **pold) |
1173 | { |
1174 | struct Qdisc *old; |
1175 | |
1176 | sch_tree_lock(q: sch); |
1177 | old = *pold; |
1178 | *pold = new; |
1179 | if (old != NULL) |
1180 | qdisc_purge_queue(sch: old); |
1181 | sch_tree_unlock(q: sch); |
1182 | |
1183 | return old; |
1184 | } |
1185 | |
1186 | static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch) |
1187 | { |
1188 | rtnl_kfree_skbs(head: skb, tail: skb); |
1189 | qdisc_qstats_drop(sch); |
1190 | } |
1191 | |
1192 | static inline int qdisc_drop_cpu(struct sk_buff *skb, struct Qdisc *sch, |
1193 | struct sk_buff **to_free) |
1194 | { |
1195 | __qdisc_drop(skb, to_free); |
1196 | qdisc_qstats_cpu_drop(sch); |
1197 | |
1198 | return NET_XMIT_DROP; |
1199 | } |
1200 | |
1201 | static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch, |
1202 | struct sk_buff **to_free) |
1203 | { |
1204 | __qdisc_drop(skb, to_free); |
1205 | qdisc_qstats_drop(sch); |
1206 | |
1207 | return NET_XMIT_DROP; |
1208 | } |
1209 | |
1210 | static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch, |
1211 | struct sk_buff **to_free) |
1212 | { |
1213 | __qdisc_drop_all(skb, to_free); |
1214 | qdisc_qstats_drop(sch); |
1215 | |
1216 | return NET_XMIT_DROP; |
1217 | } |
1218 | |
1219 | struct psched_ratecfg { |
1220 | u64 rate_bytes_ps; /* bytes per second */ |
1221 | u32 mult; |
1222 | u16 overhead; |
1223 | u16 mpu; |
1224 | u8 linklayer; |
1225 | u8 shift; |
1226 | }; |
1227 | |
1228 | static inline u64 psched_l2t_ns(const struct psched_ratecfg *r, |
1229 | unsigned int len) |
1230 | { |
1231 | len += r->overhead; |
1232 | |
1233 | if (len < r->mpu) |
1234 | len = r->mpu; |
1235 | |
1236 | if (unlikely(r->linklayer == TC_LINKLAYER_ATM)) |
1237 | return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift; |
1238 | |
1239 | return ((u64)len * r->mult) >> r->shift; |
1240 | } |
1241 | |
1242 | void psched_ratecfg_precompute(struct psched_ratecfg *r, |
1243 | const struct tc_ratespec *conf, |
1244 | u64 rate64); |
1245 | |
1246 | static inline void psched_ratecfg_getrate(struct tc_ratespec *res, |
1247 | const struct psched_ratecfg *r) |
1248 | { |
1249 | memset(res, 0, sizeof(*res)); |
1250 | |
1251 | /* legacy struct tc_ratespec has a 32bit @rate field |
1252 | * Qdisc using 64bit rate should add new attributes |
1253 | * in order to maintain compatibility. |
1254 | */ |
1255 | res->rate = min_t(u64, r->rate_bytes_ps, ~0U); |
1256 | |
1257 | res->overhead = r->overhead; |
1258 | res->mpu = r->mpu; |
1259 | res->linklayer = (r->linklayer & TC_LINKLAYER_MASK); |
1260 | } |
1261 | |
1262 | struct psched_pktrate { |
1263 | u64 rate_pkts_ps; /* packets per second */ |
1264 | u32 mult; |
1265 | u8 shift; |
1266 | }; |
1267 | |
1268 | static inline u64 psched_pkt2t_ns(const struct psched_pktrate *r, |
1269 | unsigned int pkt_num) |
1270 | { |
1271 | return ((u64)pkt_num * r->mult) >> r->shift; |
1272 | } |
1273 | |
1274 | void psched_ppscfg_precompute(struct psched_pktrate *r, u64 pktrate64); |
1275 | |
1276 | /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc. |
1277 | * The fast path only needs to access filter list and to update stats |
1278 | */ |
1279 | struct mini_Qdisc { |
1280 | struct tcf_proto *filter_list; |
1281 | struct tcf_block *block; |
1282 | struct gnet_stats_basic_sync __percpu *cpu_bstats; |
1283 | struct gnet_stats_queue __percpu *cpu_qstats; |
1284 | unsigned long rcu_state; |
1285 | }; |
1286 | |
1287 | static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq, |
1288 | const struct sk_buff *skb) |
1289 | { |
1290 | bstats_update(this_cpu_ptr(miniq->cpu_bstats), skb); |
1291 | } |
1292 | |
1293 | static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq) |
1294 | { |
1295 | this_cpu_inc(miniq->cpu_qstats->drops); |
1296 | } |
1297 | |
1298 | struct mini_Qdisc_pair { |
1299 | struct mini_Qdisc miniq1; |
1300 | struct mini_Qdisc miniq2; |
1301 | struct mini_Qdisc __rcu **p_miniq; |
1302 | }; |
1303 | |
1304 | void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp, |
1305 | struct tcf_proto *tp_head); |
1306 | void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc, |
1307 | struct mini_Qdisc __rcu **p_miniq); |
1308 | void mini_qdisc_pair_block_init(struct mini_Qdisc_pair *miniqp, |
1309 | struct tcf_block *block); |
1310 | |
1311 | void mq_change_real_num_tx(struct Qdisc *sch, unsigned int new_real_tx); |
1312 | |
1313 | int sch_frag_xmit_hook(struct sk_buff *skb, int (*xmit)(struct sk_buff *skb)); |
1314 | |
1315 | /* Make sure qdisc is no longer in SCHED state. */ |
1316 | static inline void qdisc_synchronize(const struct Qdisc *q) |
1317 | { |
1318 | while (test_bit(__QDISC_STATE_SCHED, &q->state)) |
1319 | msleep(msecs: 1); |
1320 | } |
1321 | |
1322 | #endif |
1323 | |