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Merge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[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
183 int (*enqueue)(struct sk_buff *skb,
184 struct Qdisc *sch,
185 struct sk_buff **to_free);
186 struct sk_buff * (*dequeue)(struct Qdisc *);
187 struct sk_buff * (*peek)(struct Qdisc *);
188
189 int (*init)(struct Qdisc *, struct nlattr *arg);
190 void (*reset)(struct Qdisc *);
191 void (*destroy)(struct Qdisc *);
192 int (*change)(struct Qdisc *, struct nlattr *arg);
193 void (*attach)(struct Qdisc *);
194
195 int (*dump)(struct Qdisc *, struct sk_buff *);
196 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
197
198 struct module *owner;
199 };
200
201
202 struct tcf_result {
203 union {
204 struct {
205 unsigned long class;
206 u32 classid;
207 };
208 const struct tcf_proto *goto_tp;
209 };
210 };
211
212 struct tcf_proto_ops {
213 struct list_head head;
214 char kind[IFNAMSIZ];
215
216 int (*classify)(struct sk_buff *,
217 const struct tcf_proto *,
218 struct tcf_result *);
219 int (*init)(struct tcf_proto*);
220 void (*destroy)(struct tcf_proto*);
221
222 void* (*get)(struct tcf_proto*, u32 handle);
223 int (*change)(struct net *net, struct sk_buff *,
224 struct tcf_proto*, unsigned long,
225 u32 handle, struct nlattr **,
226 void **, bool);
227 int (*delete)(struct tcf_proto*, void *, bool*);
228 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
229 void (*bind_class)(void *, u32, unsigned long);
230
231 /* rtnetlink specific */
232 int (*dump)(struct net*, struct tcf_proto*, void *,
233 struct sk_buff *skb, struct tcmsg*);
234
235 struct module *owner;
236 };
237
238 struct tcf_proto {
239 /* Fast access part */
240 struct tcf_proto __rcu *next;
241 void __rcu *root;
242 int (*classify)(struct sk_buff *,
243 const struct tcf_proto *,
244 struct tcf_result *);
245 __be16 protocol;
246
247 /* All the rest */
248 u32 prio;
249 u32 classid;
250 struct Qdisc *q;
251 void *data;
252 const struct tcf_proto_ops *ops;
253 struct tcf_chain *chain;
254 struct rcu_head rcu;
255 };
256
257 struct qdisc_skb_cb {
258 unsigned int pkt_len;
259 u16 slave_dev_queue_mapping;
260 u16 tc_classid;
261 #define QDISC_CB_PRIV_LEN 20
262 unsigned char data[QDISC_CB_PRIV_LEN];
263 };
264
265 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
266
267 struct tcf_chain {
268 struct tcf_proto __rcu *filter_chain;
269 tcf_chain_head_change_t *chain_head_change;
270 void *chain_head_change_priv;
271 struct list_head list;
272 struct tcf_block *block;
273 u32 index; /* chain index */
274 unsigned int refcnt;
275 };
276
277 struct tcf_block {
278 struct list_head chain_list;
279 struct net *net;
280 struct Qdisc *q;
281 struct list_head cb_list;
282 struct work_struct work;
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 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
448 const struct Qdisc_ops *ops, u32 parentid);
449 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
450 const struct qdisc_size_table *stab);
451 int skb_do_redirect(struct sk_buff *);
452
453 static inline void skb_reset_tc(struct sk_buff *skb)
454 {
455 #ifdef CONFIG_NET_CLS_ACT
456 skb->tc_redirected = 0;
457 #endif
458 }
459
460 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
461 {
462 #ifdef CONFIG_NET_CLS_ACT
463 return skb->tc_at_ingress;
464 #else
465 return false;
466 #endif
467 }
468
469 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
470 {
471 #ifdef CONFIG_NET_CLS_ACT
472 if (skb->tc_skip_classify) {
473 skb->tc_skip_classify = 0;
474 return true;
475 }
476 #endif
477 return false;
478 }
479
480 /* Reset all TX qdiscs greater then index of a device. */
481 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
482 {
483 struct Qdisc *qdisc;
484
485 for (; i < dev->num_tx_queues; i++) {
486 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
487 if (qdisc) {
488 spin_lock_bh(qdisc_lock(qdisc));
489 qdisc_reset(qdisc);
490 spin_unlock_bh(qdisc_lock(qdisc));
491 }
492 }
493 }
494
495 static inline void qdisc_reset_all_tx(struct net_device *dev)
496 {
497 qdisc_reset_all_tx_gt(dev, 0);
498 }
499
500 /* Are all TX queues of the device empty? */
501 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
502 {
503 unsigned int i;
504
505 rcu_read_lock();
506 for (i = 0; i < dev->num_tx_queues; i++) {
507 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
508 const struct Qdisc *q = rcu_dereference(txq->qdisc);
509
510 if (q->q.qlen) {
511 rcu_read_unlock();
512 return false;
513 }
514 }
515 rcu_read_unlock();
516 return true;
517 }
518
519 /* Are any of the TX qdiscs changing? */
520 static inline bool qdisc_tx_changing(const struct net_device *dev)
521 {
522 unsigned int i;
523
524 for (i = 0; i < dev->num_tx_queues; i++) {
525 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
526 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
527 return true;
528 }
529 return false;
530 }
531
532 /* Is the device using the noop qdisc on all queues? */
533 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
534 {
535 unsigned int i;
536
537 for (i = 0; i < dev->num_tx_queues; i++) {
538 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
539 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
540 return false;
541 }
542 return true;
543 }
544
545 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
546 {
547 return qdisc_skb_cb(skb)->pkt_len;
548 }
549
550 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
551 enum net_xmit_qdisc_t {
552 __NET_XMIT_STOLEN = 0x00010000,
553 __NET_XMIT_BYPASS = 0x00020000,
554 };
555
556 #ifdef CONFIG_NET_CLS_ACT
557 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
558 #else
559 #define net_xmit_drop_count(e) (1)
560 #endif
561
562 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
563 const struct Qdisc *sch)
564 {
565 #ifdef CONFIG_NET_SCHED
566 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
567
568 if (stab)
569 __qdisc_calculate_pkt_len(skb, stab);
570 #endif
571 }
572
573 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
574 struct sk_buff **to_free)
575 {
576 qdisc_calculate_pkt_len(skb, sch);
577 return sch->enqueue(skb, sch, to_free);
578 }
579
580 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
581 {
582 return q->flags & TCQ_F_CPUSTATS;
583 }
584
585 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
586 __u64 bytes, __u32 packets)
587 {
588 bstats->bytes += bytes;
589 bstats->packets += packets;
590 }
591
592 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
593 const struct sk_buff *skb)
594 {
595 _bstats_update(bstats,
596 qdisc_pkt_len(skb),
597 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
598 }
599
600 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
601 __u64 bytes, __u32 packets)
602 {
603 u64_stats_update_begin(&bstats->syncp);
604 _bstats_update(&bstats->bstats, bytes, packets);
605 u64_stats_update_end(&bstats->syncp);
606 }
607
608 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
609 const struct sk_buff *skb)
610 {
611 u64_stats_update_begin(&bstats->syncp);
612 bstats_update(&bstats->bstats, skb);
613 u64_stats_update_end(&bstats->syncp);
614 }
615
616 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
617 const struct sk_buff *skb)
618 {
619 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
620 }
621
622 static inline void qdisc_bstats_update(struct Qdisc *sch,
623 const struct sk_buff *skb)
624 {
625 bstats_update(&sch->bstats, skb);
626 }
627
628 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
629 const struct sk_buff *skb)
630 {
631 sch->qstats.backlog -= qdisc_pkt_len(skb);
632 }
633
634 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
635 const struct sk_buff *skb)
636 {
637 sch->qstats.backlog += qdisc_pkt_len(skb);
638 }
639
640 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
641 {
642 sch->qstats.drops += count;
643 }
644
645 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
646 {
647 qstats->drops++;
648 }
649
650 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
651 {
652 qstats->overlimits++;
653 }
654
655 static inline void qdisc_qstats_drop(struct Qdisc *sch)
656 {
657 qstats_drop_inc(&sch->qstats);
658 }
659
660 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
661 {
662 this_cpu_inc(sch->cpu_qstats->drops);
663 }
664
665 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
666 {
667 sch->qstats.overlimits++;
668 }
669
670 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
671 {
672 qh->head = NULL;
673 qh->tail = NULL;
674 qh->qlen = 0;
675 }
676
677 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
678 struct qdisc_skb_head *qh)
679 {
680 struct sk_buff *last = qh->tail;
681
682 if (last) {
683 skb->next = NULL;
684 last->next = skb;
685 qh->tail = skb;
686 } else {
687 qh->tail = skb;
688 qh->head = skb;
689 }
690 qh->qlen++;
691 qdisc_qstats_backlog_inc(sch, skb);
692
693 return NET_XMIT_SUCCESS;
694 }
695
696 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
697 {
698 return __qdisc_enqueue_tail(skb, sch, &sch->q);
699 }
700
701 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
702 {
703 struct sk_buff *skb = qh->head;
704
705 if (likely(skb != NULL)) {
706 qh->head = skb->next;
707 qh->qlen--;
708 if (qh->head == NULL)
709 qh->tail = NULL;
710 skb->next = NULL;
711 }
712
713 return skb;
714 }
715
716 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
717 {
718 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
719
720 if (likely(skb != NULL)) {
721 qdisc_qstats_backlog_dec(sch, skb);
722 qdisc_bstats_update(sch, skb);
723 }
724
725 return skb;
726 }
727
728 /* Instead of calling kfree_skb() while root qdisc lock is held,
729 * queue the skb for future freeing at end of __dev_xmit_skb()
730 */
731 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
732 {
733 skb->next = *to_free;
734 *to_free = skb;
735 }
736
737 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
738 struct qdisc_skb_head *qh,
739 struct sk_buff **to_free)
740 {
741 struct sk_buff *skb = __qdisc_dequeue_head(qh);
742
743 if (likely(skb != NULL)) {
744 unsigned int len = qdisc_pkt_len(skb);
745
746 qdisc_qstats_backlog_dec(sch, skb);
747 __qdisc_drop(skb, to_free);
748 return len;
749 }
750
751 return 0;
752 }
753
754 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
755 struct sk_buff **to_free)
756 {
757 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
758 }
759
760 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
761 {
762 const struct qdisc_skb_head *qh = &sch->q;
763
764 return qh->head;
765 }
766
767 /* generic pseudo peek method for non-work-conserving qdisc */
768 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
769 {
770 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
771 if (!sch->gso_skb) {
772 sch->gso_skb = sch->dequeue(sch);
773 if (sch->gso_skb) {
774 /* it's still part of the queue */
775 qdisc_qstats_backlog_inc(sch, sch->gso_skb);
776 sch->q.qlen++;
777 }
778 }
779
780 return sch->gso_skb;
781 }
782
783 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
784 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
785 {
786 struct sk_buff *skb = sch->gso_skb;
787
788 if (skb) {
789 sch->gso_skb = NULL;
790 qdisc_qstats_backlog_dec(sch, skb);
791 sch->q.qlen--;
792 } else {
793 skb = sch->dequeue(sch);
794 }
795
796 return skb;
797 }
798
799 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
800 {
801 /*
802 * We do not know the backlog in bytes of this list, it
803 * is up to the caller to correct it
804 */
805 ASSERT_RTNL();
806 if (qh->qlen) {
807 rtnl_kfree_skbs(qh->head, qh->tail);
808
809 qh->head = NULL;
810 qh->tail = NULL;
811 qh->qlen = 0;
812 }
813 }
814
815 static inline void qdisc_reset_queue(struct Qdisc *sch)
816 {
817 __qdisc_reset_queue(&sch->q);
818 sch->qstats.backlog = 0;
819 }
820
821 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
822 struct Qdisc **pold)
823 {
824 struct Qdisc *old;
825
826 sch_tree_lock(sch);
827 old = *pold;
828 *pold = new;
829 if (old != NULL) {
830 unsigned int qlen = old->q.qlen;
831 unsigned int backlog = old->qstats.backlog;
832
833 qdisc_reset(old);
834 qdisc_tree_reduce_backlog(old, qlen, backlog);
835 }
836 sch_tree_unlock(sch);
837
838 return old;
839 }
840
841 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
842 {
843 rtnl_kfree_skbs(skb, skb);
844 qdisc_qstats_drop(sch);
845 }
846
847
848 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
849 struct sk_buff **to_free)
850 {
851 __qdisc_drop(skb, to_free);
852 qdisc_qstats_drop(sch);
853
854 return NET_XMIT_DROP;
855 }
856
857 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
858 long it will take to send a packet given its size.
859 */
860 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
861 {
862 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
863 if (slot < 0)
864 slot = 0;
865 slot >>= rtab->rate.cell_log;
866 if (slot > 255)
867 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
868 return rtab->data[slot];
869 }
870
871 struct psched_ratecfg {
872 u64 rate_bytes_ps; /* bytes per second */
873 u32 mult;
874 u16 overhead;
875 u8 linklayer;
876 u8 shift;
877 };
878
879 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
880 unsigned int len)
881 {
882 len += r->overhead;
883
884 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
885 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
886
887 return ((u64)len * r->mult) >> r->shift;
888 }
889
890 void psched_ratecfg_precompute(struct psched_ratecfg *r,
891 const struct tc_ratespec *conf,
892 u64 rate64);
893
894 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
895 const struct psched_ratecfg *r)
896 {
897 memset(res, 0, sizeof(*res));
898
899 /* legacy struct tc_ratespec has a 32bit @rate field
900 * Qdisc using 64bit rate should add new attributes
901 * in order to maintain compatibility.
902 */
903 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
904
905 res->overhead = r->overhead;
906 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
907 }
908
909 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
910 * The fast path only needs to access filter list and to update stats
911 */
912 struct mini_Qdisc {
913 struct tcf_proto *filter_list;
914 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
915 struct gnet_stats_queue __percpu *cpu_qstats;
916 struct rcu_head rcu;
917 };
918
919 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
920 const struct sk_buff *skb)
921 {
922 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
923 }
924
925 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
926 {
927 this_cpu_inc(miniq->cpu_qstats->drops);
928 }
929
930 struct mini_Qdisc_pair {
931 struct mini_Qdisc miniq1;
932 struct mini_Qdisc miniq2;
933 struct mini_Qdisc __rcu **p_miniq;
934 };
935
936 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
937 struct tcf_proto *tp_head);
938 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
939 struct mini_Qdisc __rcu **p_miniq);
940
941 #endif
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