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tcp/dccp: fix lockdep issue when SYN is backlogged
[mirror_ubuntu-bionic-kernel.git] / include / net / sch_generic.h
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 <net/gen_stats.h>
16 #include <net/rtnetlink.h>
17
18 struct Qdisc_ops;
19 struct qdisc_walker;
20 struct tcf_walker;
21 struct module;
22
23 struct qdisc_rate_table {
24 struct tc_ratespec rate;
25 u32 data[256];
26 struct qdisc_rate_table *next;
27 int refcnt;
28 };
29
30 enum qdisc_state_t {
31 __QDISC_STATE_SCHED,
32 __QDISC_STATE_DEACTIVATED,
33 };
34
35 struct qdisc_size_table {
36 struct rcu_head rcu;
37 struct list_head list;
38 struct tc_sizespec szopts;
39 int refcnt;
40 u16 data[];
41 };
42
43 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
44 struct qdisc_skb_head {
45 struct sk_buff *head;
46 struct sk_buff *tail;
47 __u32 qlen;
48 spinlock_t lock;
49 };
50
51 struct Qdisc {
52 int (*enqueue)(struct sk_buff *skb,
53 struct Qdisc *sch,
54 struct sk_buff **to_free);
55 struct sk_buff * (*dequeue)(struct Qdisc *sch);
56 unsigned int flags;
57 #define TCQ_F_BUILTIN 1
58 #define TCQ_F_INGRESS 2
59 #define TCQ_F_CAN_BYPASS 4
60 #define TCQ_F_MQROOT 8
61 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
62 * q->dev_queue : It can test
63 * netif_xmit_frozen_or_stopped() before
64 * dequeueing next packet.
65 * Its true for MQ/MQPRIO slaves, or non
66 * multiqueue device.
67 */
68 #define TCQ_F_WARN_NONWC (1 << 16)
69 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
70 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
71 * qdisc_tree_decrease_qlen() should stop.
72 */
73 #define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */
74 #define TCQ_F_OFFLOADED 0x200 /* qdisc is offloaded to HW */
75 u32 limit;
76 const struct Qdisc_ops *ops;
77 struct qdisc_size_table __rcu *stab;
78 struct hlist_node hash;
79 u32 handle;
80 u32 parent;
81
82 struct netdev_queue *dev_queue;
83
84 struct net_rate_estimator __rcu *rate_est;
85 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
86 struct gnet_stats_queue __percpu *cpu_qstats;
87
88 /*
89 * For performance sake on SMP, we put highly modified fields at the end
90 */
91 struct sk_buff *gso_skb ____cacheline_aligned_in_smp;
92 struct qdisc_skb_head q;
93 struct gnet_stats_basic_packed bstats;
94 seqcount_t running;
95 struct gnet_stats_queue qstats;
96 unsigned long state;
97 struct Qdisc *next_sched;
98 struct sk_buff *skb_bad_txq;
99 int padded;
100 refcount_t refcnt;
101
102 spinlock_t busylock ____cacheline_aligned_in_smp;
103 };
104
105 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
106 {
107 if (qdisc->flags & TCQ_F_BUILTIN)
108 return;
109 refcount_inc(&qdisc->refcnt);
110 }
111
112 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
113 {
114 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
115 }
116
117 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
118 {
119 if (qdisc_is_running(qdisc))
120 return false;
121 /* Variant of write_seqcount_begin() telling lockdep a trylock
122 * was attempted.
123 */
124 raw_write_seqcount_begin(&qdisc->running);
125 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
126 return true;
127 }
128
129 static inline void qdisc_run_end(struct Qdisc *qdisc)
130 {
131 write_seqcount_end(&qdisc->running);
132 }
133
134 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
135 {
136 return qdisc->flags & TCQ_F_ONETXQUEUE;
137 }
138
139 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
140 {
141 #ifdef CONFIG_BQL
142 /* Non-BQL migrated drivers will return 0, too. */
143 return dql_avail(&txq->dql);
144 #else
145 return 0;
146 #endif
147 }
148
149 struct Qdisc_class_ops {
150 /* Child qdisc manipulation */
151 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
152 int (*graft)(struct Qdisc *, unsigned long cl,
153 struct Qdisc *, struct Qdisc **);
154 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
155 void (*qlen_notify)(struct Qdisc *, unsigned long);
156
157 /* Class manipulation routines */
158 unsigned long (*find)(struct Qdisc *, u32 classid);
159 int (*change)(struct Qdisc *, u32, u32,
160 struct nlattr **, unsigned long *);
161 int (*delete)(struct Qdisc *, unsigned long);
162 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
163
164 /* Filter manipulation */
165 struct tcf_block * (*tcf_block)(struct Qdisc *, unsigned long);
166 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
167 u32 classid);
168 void (*unbind_tcf)(struct Qdisc *, unsigned long);
169
170 /* rtnetlink specific */
171 int (*dump)(struct Qdisc *, unsigned long,
172 struct sk_buff *skb, struct tcmsg*);
173 int (*dump_stats)(struct Qdisc *, unsigned long,
174 struct gnet_dump *);
175 };
176
177 struct Qdisc_ops {
178 struct Qdisc_ops *next;
179 const struct Qdisc_class_ops *cl_ops;
180 char id[IFNAMSIZ];
181 int priv_size;
182 unsigned int static_flags;
183
184 int (*enqueue)(struct sk_buff *skb,
185 struct Qdisc *sch,
186 struct sk_buff **to_free);
187 struct sk_buff * (*dequeue)(struct Qdisc *);
188 struct sk_buff * (*peek)(struct Qdisc *);
189
190 int (*init)(struct Qdisc *, struct nlattr *arg);
191 void (*reset)(struct Qdisc *);
192 void (*destroy)(struct Qdisc *);
193 int (*change)(struct Qdisc *, struct nlattr *arg);
194 void (*attach)(struct Qdisc *);
195
196 int (*dump)(struct Qdisc *, struct sk_buff *);
197 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
198
199 struct module *owner;
200 };
201
202
203 struct tcf_result {
204 union {
205 struct {
206 unsigned long class;
207 u32 classid;
208 };
209 const struct tcf_proto *goto_tp;
210 };
211 };
212
213 struct tcf_proto_ops {
214 struct list_head head;
215 char kind[IFNAMSIZ];
216
217 int (*classify)(struct sk_buff *,
218 const struct tcf_proto *,
219 struct tcf_result *);
220 int (*init)(struct tcf_proto*);
221 void (*destroy)(struct tcf_proto*);
222
223 void* (*get)(struct tcf_proto*, u32 handle);
224 int (*change)(struct net *net, struct sk_buff *,
225 struct tcf_proto*, unsigned long,
226 u32 handle, struct nlattr **,
227 void **, bool);
228 int (*delete)(struct tcf_proto*, void *, bool*);
229 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
230 void (*bind_class)(void *, u32, unsigned long);
231
232 /* rtnetlink specific */
233 int (*dump)(struct net*, struct tcf_proto*, void *,
234 struct sk_buff *skb, struct tcmsg*);
235
236 struct module *owner;
237 };
238
239 struct tcf_proto {
240 /* Fast access part */
241 struct tcf_proto __rcu *next;
242 void __rcu *root;
243 int (*classify)(struct sk_buff *,
244 const struct tcf_proto *,
245 struct tcf_result *);
246 __be16 protocol;
247
248 /* All the rest */
249 u32 prio;
250 u32 classid;
251 struct Qdisc *q;
252 void *data;
253 const struct tcf_proto_ops *ops;
254 struct tcf_chain *chain;
255 struct rcu_head rcu;
256 };
257
258 struct qdisc_skb_cb {
259 unsigned int pkt_len;
260 u16 slave_dev_queue_mapping;
261 u16 tc_classid;
262 #define QDISC_CB_PRIV_LEN 20
263 unsigned char data[QDISC_CB_PRIV_LEN];
264 };
265
266 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
267
268 struct tcf_chain {
269 struct tcf_proto __rcu *filter_chain;
270 tcf_chain_head_change_t *chain_head_change;
271 void *chain_head_change_priv;
272 struct list_head list;
273 struct tcf_block *block;
274 u32 index; /* chain index */
275 unsigned int refcnt;
276 };
277
278 struct tcf_block {
279 struct list_head chain_list;
280 struct net *net;
281 struct Qdisc *q;
282 struct list_head cb_list;
283 };
284
285 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
286 {
287 struct qdisc_skb_cb *qcb;
288
289 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
290 BUILD_BUG_ON(sizeof(qcb->data) < sz);
291 }
292
293 static inline int qdisc_qlen(const struct Qdisc *q)
294 {
295 return q->q.qlen;
296 }
297
298 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
299 {
300 return (struct qdisc_skb_cb *)skb->cb;
301 }
302
303 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
304 {
305 return &qdisc->q.lock;
306 }
307
308 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
309 {
310 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
311
312 return q;
313 }
314
315 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
316 {
317 return qdisc->dev_queue->qdisc_sleeping;
318 }
319
320 /* The qdisc root lock is a mechanism by which to top level
321 * of a qdisc tree can be locked from any qdisc node in the
322 * forest. This allows changing the configuration of some
323 * aspect of the qdisc tree while blocking out asynchronous
324 * qdisc access in the packet processing paths.
325 *
326 * It is only legal to do this when the root will not change
327 * on us. Otherwise we'll potentially lock the wrong qdisc
328 * root. This is enforced by holding the RTNL semaphore, which
329 * all users of this lock accessor must do.
330 */
331 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
332 {
333 struct Qdisc *root = qdisc_root(qdisc);
334
335 ASSERT_RTNL();
336 return qdisc_lock(root);
337 }
338
339 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
340 {
341 struct Qdisc *root = qdisc_root_sleeping(qdisc);
342
343 ASSERT_RTNL();
344 return qdisc_lock(root);
345 }
346
347 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
348 {
349 struct Qdisc *root = qdisc_root_sleeping(qdisc);
350
351 ASSERT_RTNL();
352 return &root->running;
353 }
354
355 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
356 {
357 return qdisc->dev_queue->dev;
358 }
359
360 static inline void sch_tree_lock(const struct Qdisc *q)
361 {
362 spin_lock_bh(qdisc_root_sleeping_lock(q));
363 }
364
365 static inline void sch_tree_unlock(const struct Qdisc *q)
366 {
367 spin_unlock_bh(qdisc_root_sleeping_lock(q));
368 }
369
370 extern struct Qdisc noop_qdisc;
371 extern struct Qdisc_ops noop_qdisc_ops;
372 extern struct Qdisc_ops pfifo_fast_ops;
373 extern struct Qdisc_ops mq_qdisc_ops;
374 extern struct Qdisc_ops noqueue_qdisc_ops;
375 extern const struct Qdisc_ops *default_qdisc_ops;
376 static inline const struct Qdisc_ops *
377 get_default_qdisc_ops(const struct net_device *dev, int ntx)
378 {
379 return ntx < dev->real_num_tx_queues ?
380 default_qdisc_ops : &pfifo_fast_ops;
381 }
382
383 struct Qdisc_class_common {
384 u32 classid;
385 struct hlist_node hnode;
386 };
387
388 struct Qdisc_class_hash {
389 struct hlist_head *hash;
390 unsigned int hashsize;
391 unsigned int hashmask;
392 unsigned int hashelems;
393 };
394
395 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
396 {
397 id ^= id >> 8;
398 id ^= id >> 4;
399 return id & mask;
400 }
401
402 static inline struct Qdisc_class_common *
403 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
404 {
405 struct Qdisc_class_common *cl;
406 unsigned int h;
407
408 if (!id)
409 return NULL;
410
411 h = qdisc_class_hash(id, hash->hashmask);
412 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
413 if (cl->classid == id)
414 return cl;
415 }
416 return NULL;
417 }
418
419 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
420 {
421 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
422
423 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
424 }
425
426 int qdisc_class_hash_init(struct Qdisc_class_hash *);
427 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
428 struct Qdisc_class_common *);
429 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
430 struct Qdisc_class_common *);
431 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
432 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
433
434 void dev_init_scheduler(struct net_device *dev);
435 void dev_shutdown(struct net_device *dev);
436 void dev_activate(struct net_device *dev);
437 void dev_deactivate(struct net_device *dev);
438 void dev_deactivate_many(struct list_head *head);
439 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
440 struct Qdisc *qdisc);
441 void qdisc_reset(struct Qdisc *qdisc);
442 void qdisc_destroy(struct Qdisc *qdisc);
443 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
444 unsigned int len);
445 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
446 const struct Qdisc_ops *ops);
447 void qdisc_free(struct Qdisc *qdisc);
448 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
449 const struct Qdisc_ops *ops, u32 parentid);
450 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
451 const struct qdisc_size_table *stab);
452 int skb_do_redirect(struct sk_buff *);
453
454 static inline void skb_reset_tc(struct sk_buff *skb)
455 {
456 #ifdef CONFIG_NET_CLS_ACT
457 skb->tc_redirected = 0;
458 #endif
459 }
460
461 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
462 {
463 #ifdef CONFIG_NET_CLS_ACT
464 return skb->tc_at_ingress;
465 #else
466 return false;
467 #endif
468 }
469
470 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
471 {
472 #ifdef CONFIG_NET_CLS_ACT
473 if (skb->tc_skip_classify) {
474 skb->tc_skip_classify = 0;
475 return true;
476 }
477 #endif
478 return false;
479 }
480
481 /* Reset all TX qdiscs greater then index of a device. */
482 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
483 {
484 struct Qdisc *qdisc;
485
486 for (; i < dev->num_tx_queues; i++) {
487 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
488 if (qdisc) {
489 spin_lock_bh(qdisc_lock(qdisc));
490 qdisc_reset(qdisc);
491 spin_unlock_bh(qdisc_lock(qdisc));
492 }
493 }
494 }
495
496 static inline void qdisc_reset_all_tx(struct net_device *dev)
497 {
498 qdisc_reset_all_tx_gt(dev, 0);
499 }
500
501 /* Are all TX queues of the device empty? */
502 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
503 {
504 unsigned int i;
505
506 rcu_read_lock();
507 for (i = 0; i < dev->num_tx_queues; i++) {
508 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
509 const struct Qdisc *q = rcu_dereference(txq->qdisc);
510
511 if (q->q.qlen) {
512 rcu_read_unlock();
513 return false;
514 }
515 }
516 rcu_read_unlock();
517 return true;
518 }
519
520 /* Are any of the TX qdiscs changing? */
521 static inline bool qdisc_tx_changing(const struct net_device *dev)
522 {
523 unsigned int i;
524
525 for (i = 0; i < dev->num_tx_queues; i++) {
526 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
527 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
528 return true;
529 }
530 return false;
531 }
532
533 /* Is the device using the noop qdisc on all queues? */
534 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
535 {
536 unsigned int i;
537
538 for (i = 0; i < dev->num_tx_queues; i++) {
539 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
540 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
541 return false;
542 }
543 return true;
544 }
545
546 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
547 {
548 return qdisc_skb_cb(skb)->pkt_len;
549 }
550
551 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
552 enum net_xmit_qdisc_t {
553 __NET_XMIT_STOLEN = 0x00010000,
554 __NET_XMIT_BYPASS = 0x00020000,
555 };
556
557 #ifdef CONFIG_NET_CLS_ACT
558 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
559 #else
560 #define net_xmit_drop_count(e) (1)
561 #endif
562
563 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
564 const struct Qdisc *sch)
565 {
566 #ifdef CONFIG_NET_SCHED
567 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
568
569 if (stab)
570 __qdisc_calculate_pkt_len(skb, stab);
571 #endif
572 }
573
574 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
575 struct sk_buff **to_free)
576 {
577 qdisc_calculate_pkt_len(skb, sch);
578 return sch->enqueue(skb, sch, to_free);
579 }
580
581 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
582 {
583 return q->flags & TCQ_F_CPUSTATS;
584 }
585
586 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
587 __u64 bytes, __u32 packets)
588 {
589 bstats->bytes += bytes;
590 bstats->packets += packets;
591 }
592
593 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
594 const struct sk_buff *skb)
595 {
596 _bstats_update(bstats,
597 qdisc_pkt_len(skb),
598 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
599 }
600
601 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
602 __u64 bytes, __u32 packets)
603 {
604 u64_stats_update_begin(&bstats->syncp);
605 _bstats_update(&bstats->bstats, bytes, packets);
606 u64_stats_update_end(&bstats->syncp);
607 }
608
609 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
610 const struct sk_buff *skb)
611 {
612 u64_stats_update_begin(&bstats->syncp);
613 bstats_update(&bstats->bstats, skb);
614 u64_stats_update_end(&bstats->syncp);
615 }
616
617 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
618 const struct sk_buff *skb)
619 {
620 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
621 }
622
623 static inline void qdisc_bstats_update(struct Qdisc *sch,
624 const struct sk_buff *skb)
625 {
626 bstats_update(&sch->bstats, skb);
627 }
628
629 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
630 const struct sk_buff *skb)
631 {
632 sch->qstats.backlog -= qdisc_pkt_len(skb);
633 }
634
635 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
636 const struct sk_buff *skb)
637 {
638 sch->qstats.backlog += qdisc_pkt_len(skb);
639 }
640
641 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
642 {
643 sch->qstats.drops += count;
644 }
645
646 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
647 {
648 qstats->drops++;
649 }
650
651 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
652 {
653 qstats->overlimits++;
654 }
655
656 static inline void qdisc_qstats_drop(struct Qdisc *sch)
657 {
658 qstats_drop_inc(&sch->qstats);
659 }
660
661 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
662 {
663 this_cpu_inc(sch->cpu_qstats->drops);
664 }
665
666 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
667 {
668 sch->qstats.overlimits++;
669 }
670
671 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
672 {
673 qh->head = NULL;
674 qh->tail = NULL;
675 qh->qlen = 0;
676 }
677
678 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
679 struct qdisc_skb_head *qh)
680 {
681 struct sk_buff *last = qh->tail;
682
683 if (last) {
684 skb->next = NULL;
685 last->next = skb;
686 qh->tail = skb;
687 } else {
688 qh->tail = skb;
689 qh->head = skb;
690 }
691 qh->qlen++;
692 qdisc_qstats_backlog_inc(sch, skb);
693
694 return NET_XMIT_SUCCESS;
695 }
696
697 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
698 {
699 return __qdisc_enqueue_tail(skb, sch, &sch->q);
700 }
701
702 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
703 {
704 struct sk_buff *skb = qh->head;
705
706 if (likely(skb != NULL)) {
707 qh->head = skb->next;
708 qh->qlen--;
709 if (qh->head == NULL)
710 qh->tail = NULL;
711 skb->next = NULL;
712 }
713
714 return skb;
715 }
716
717 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
718 {
719 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
720
721 if (likely(skb != NULL)) {
722 qdisc_qstats_backlog_dec(sch, skb);
723 qdisc_bstats_update(sch, skb);
724 }
725
726 return skb;
727 }
728
729 /* Instead of calling kfree_skb() while root qdisc lock is held,
730 * queue the skb for future freeing at end of __dev_xmit_skb()
731 */
732 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
733 {
734 skb->next = *to_free;
735 *to_free = skb;
736 }
737
738 static inline void __qdisc_drop_all(struct sk_buff *skb,
739 struct sk_buff **to_free)
740 {
741 if (skb->prev)
742 skb->prev->next = *to_free;
743 else
744 skb->next = *to_free;
745 *to_free = skb;
746 }
747
748 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
749 struct qdisc_skb_head *qh,
750 struct sk_buff **to_free)
751 {
752 struct sk_buff *skb = __qdisc_dequeue_head(qh);
753
754 if (likely(skb != NULL)) {
755 unsigned int len = qdisc_pkt_len(skb);
756
757 qdisc_qstats_backlog_dec(sch, skb);
758 __qdisc_drop(skb, to_free);
759 return len;
760 }
761
762 return 0;
763 }
764
765 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
766 struct sk_buff **to_free)
767 {
768 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
769 }
770
771 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
772 {
773 const struct qdisc_skb_head *qh = &sch->q;
774
775 return qh->head;
776 }
777
778 /* generic pseudo peek method for non-work-conserving qdisc */
779 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
780 {
781 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
782 if (!sch->gso_skb) {
783 sch->gso_skb = sch->dequeue(sch);
784 if (sch->gso_skb) {
785 /* it's still part of the queue */
786 qdisc_qstats_backlog_inc(sch, sch->gso_skb);
787 sch->q.qlen++;
788 }
789 }
790
791 return sch->gso_skb;
792 }
793
794 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
795 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
796 {
797 struct sk_buff *skb = sch->gso_skb;
798
799 if (skb) {
800 sch->gso_skb = NULL;
801 qdisc_qstats_backlog_dec(sch, skb);
802 sch->q.qlen--;
803 } else {
804 skb = sch->dequeue(sch);
805 }
806
807 return skb;
808 }
809
810 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
811 {
812 /*
813 * We do not know the backlog in bytes of this list, it
814 * is up to the caller to correct it
815 */
816 ASSERT_RTNL();
817 if (qh->qlen) {
818 rtnl_kfree_skbs(qh->head, qh->tail);
819
820 qh->head = NULL;
821 qh->tail = NULL;
822 qh->qlen = 0;
823 }
824 }
825
826 static inline void qdisc_reset_queue(struct Qdisc *sch)
827 {
828 __qdisc_reset_queue(&sch->q);
829 sch->qstats.backlog = 0;
830 }
831
832 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
833 struct Qdisc **pold)
834 {
835 struct Qdisc *old;
836
837 sch_tree_lock(sch);
838 old = *pold;
839 *pold = new;
840 if (old != NULL) {
841 unsigned int qlen = old->q.qlen;
842 unsigned int backlog = old->qstats.backlog;
843
844 qdisc_reset(old);
845 qdisc_tree_reduce_backlog(old, qlen, backlog);
846 }
847 sch_tree_unlock(sch);
848
849 return old;
850 }
851
852 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
853 {
854 rtnl_kfree_skbs(skb, skb);
855 qdisc_qstats_drop(sch);
856 }
857
858
859 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
860 struct sk_buff **to_free)
861 {
862 __qdisc_drop(skb, to_free);
863 qdisc_qstats_drop(sch);
864
865 return NET_XMIT_DROP;
866 }
867
868 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
869 struct sk_buff **to_free)
870 {
871 __qdisc_drop_all(skb, to_free);
872 qdisc_qstats_drop(sch);
873
874 return NET_XMIT_DROP;
875 }
876
877 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
878 long it will take to send a packet given its size.
879 */
880 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
881 {
882 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
883 if (slot < 0)
884 slot = 0;
885 slot >>= rtab->rate.cell_log;
886 if (slot > 255)
887 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
888 return rtab->data[slot];
889 }
890
891 struct psched_ratecfg {
892 u64 rate_bytes_ps; /* bytes per second */
893 u32 mult;
894 u16 overhead;
895 u8 linklayer;
896 u8 shift;
897 };
898
899 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
900 unsigned int len)
901 {
902 len += r->overhead;
903
904 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
905 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
906
907 return ((u64)len * r->mult) >> r->shift;
908 }
909
910 void psched_ratecfg_precompute(struct psched_ratecfg *r,
911 const struct tc_ratespec *conf,
912 u64 rate64);
913
914 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
915 const struct psched_ratecfg *r)
916 {
917 memset(res, 0, sizeof(*res));
918
919 /* legacy struct tc_ratespec has a 32bit @rate field
920 * Qdisc using 64bit rate should add new attributes
921 * in order to maintain compatibility.
922 */
923 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
924
925 res->overhead = r->overhead;
926 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
927 }
928
929 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
930 * The fast path only needs to access filter list and to update stats
931 */
932 struct mini_Qdisc {
933 struct tcf_proto *filter_list;
934 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
935 struct gnet_stats_queue __percpu *cpu_qstats;
936 struct rcu_head rcu;
937 };
938
939 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
940 const struct sk_buff *skb)
941 {
942 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
943 }
944
945 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
946 {
947 this_cpu_inc(miniq->cpu_qstats->drops);
948 }
949
950 struct mini_Qdisc_pair {
951 struct mini_Qdisc miniq1;
952 struct mini_Qdisc miniq2;
953 struct mini_Qdisc __rcu **p_miniq;
954 };
955
956 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
957 struct tcf_proto *tp_head);
958 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
959 struct mini_Qdisc __rcu **p_miniq);
960
961 #endif
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