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Merge tag 'bcm2835-dt-next-fixes-2017-11-15' into devicetree/fixes
[mirror_ubuntu-jammy-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 u32 limit;
75 const struct Qdisc_ops *ops;
76 struct qdisc_size_table __rcu *stab;
77 struct hlist_node hash;
78 u32 handle;
79 u32 parent;
80
81 struct netdev_queue *dev_queue;
82
83 struct net_rate_estimator __rcu *rate_est;
84 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
85 struct gnet_stats_queue __percpu *cpu_qstats;
86
87 /*
88 * For performance sake on SMP, we put highly modified fields at the end
89 */
90 struct sk_buff *gso_skb ____cacheline_aligned_in_smp;
91 struct qdisc_skb_head q;
92 struct gnet_stats_basic_packed bstats;
93 seqcount_t running;
94 struct gnet_stats_queue qstats;
95 unsigned long state;
96 struct Qdisc *next_sched;
97 struct sk_buff *skb_bad_txq;
98 int padded;
99 refcount_t refcnt;
100
101 spinlock_t busylock ____cacheline_aligned_in_smp;
102 };
103
104 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
105 {
106 if (qdisc->flags & TCQ_F_BUILTIN)
107 return;
108 refcount_inc(&qdisc->refcnt);
109 }
110
111 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
112 {
113 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
114 }
115
116 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
117 {
118 if (qdisc_is_running(qdisc))
119 return false;
120 /* Variant of write_seqcount_begin() telling lockdep a trylock
121 * was attempted.
122 */
123 raw_write_seqcount_begin(&qdisc->running);
124 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
125 return true;
126 }
127
128 static inline void qdisc_run_end(struct Qdisc *qdisc)
129 {
130 write_seqcount_end(&qdisc->running);
131 }
132
133 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
134 {
135 return qdisc->flags & TCQ_F_ONETXQUEUE;
136 }
137
138 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
139 {
140 #ifdef CONFIG_BQL
141 /* Non-BQL migrated drivers will return 0, too. */
142 return dql_avail(&txq->dql);
143 #else
144 return 0;
145 #endif
146 }
147
148 struct Qdisc_class_ops {
149 /* Child qdisc manipulation */
150 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
151 int (*graft)(struct Qdisc *, unsigned long cl,
152 struct Qdisc *, struct Qdisc **);
153 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
154 void (*qlen_notify)(struct Qdisc *, unsigned long);
155
156 /* Class manipulation routines */
157 unsigned long (*find)(struct Qdisc *, u32 classid);
158 int (*change)(struct Qdisc *, u32, u32,
159 struct nlattr **, unsigned long *);
160 int (*delete)(struct Qdisc *, unsigned long);
161 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
162
163 /* Filter manipulation */
164 struct tcf_block * (*tcf_block)(struct Qdisc *, unsigned long);
165 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
166 u32 classid);
167 void (*unbind_tcf)(struct Qdisc *, unsigned long);
168
169 /* rtnetlink specific */
170 int (*dump)(struct Qdisc *, unsigned long,
171 struct sk_buff *skb, struct tcmsg*);
172 int (*dump_stats)(struct Qdisc *, unsigned long,
173 struct gnet_dump *);
174 };
175
176 struct Qdisc_ops {
177 struct Qdisc_ops *next;
178 const struct Qdisc_class_ops *cl_ops;
179 char id[IFNAMSIZ];
180 int priv_size;
181
182 int (*enqueue)(struct sk_buff *skb,
183 struct Qdisc *sch,
184 struct sk_buff **to_free);
185 struct sk_buff * (*dequeue)(struct Qdisc *);
186 struct sk_buff * (*peek)(struct Qdisc *);
187
188 int (*init)(struct Qdisc *, struct nlattr *arg);
189 void (*reset)(struct Qdisc *);
190 void (*destroy)(struct Qdisc *);
191 int (*change)(struct Qdisc *, struct nlattr *arg);
192 void (*attach)(struct Qdisc *);
193
194 int (*dump)(struct Qdisc *, struct sk_buff *);
195 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
196
197 struct module *owner;
198 };
199
200
201 struct tcf_result {
202 union {
203 struct {
204 unsigned long class;
205 u32 classid;
206 };
207 const struct tcf_proto *goto_tp;
208 };
209 };
210
211 struct tcf_proto_ops {
212 struct list_head head;
213 char kind[IFNAMSIZ];
214
215 int (*classify)(struct sk_buff *,
216 const struct tcf_proto *,
217 struct tcf_result *);
218 int (*init)(struct tcf_proto*);
219 void (*destroy)(struct tcf_proto*);
220
221 void* (*get)(struct tcf_proto*, u32 handle);
222 int (*change)(struct net *net, struct sk_buff *,
223 struct tcf_proto*, unsigned long,
224 u32 handle, struct nlattr **,
225 void **, bool);
226 int (*delete)(struct tcf_proto*, void *, bool*);
227 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
228 void (*bind_class)(void *, u32, unsigned long);
229
230 /* rtnetlink specific */
231 int (*dump)(struct net*, struct tcf_proto*, void *,
232 struct sk_buff *skb, struct tcmsg*);
233
234 struct module *owner;
235 };
236
237 struct tcf_proto {
238 /* Fast access part */
239 struct tcf_proto __rcu *next;
240 void __rcu *root;
241 int (*classify)(struct sk_buff *,
242 const struct tcf_proto *,
243 struct tcf_result *);
244 __be16 protocol;
245
246 /* All the rest */
247 u32 prio;
248 u32 classid;
249 struct Qdisc *q;
250 void *data;
251 const struct tcf_proto_ops *ops;
252 struct tcf_chain *chain;
253 struct rcu_head rcu;
254 };
255
256 struct qdisc_skb_cb {
257 unsigned int pkt_len;
258 u16 slave_dev_queue_mapping;
259 u16 tc_classid;
260 #define QDISC_CB_PRIV_LEN 20
261 unsigned char data[QDISC_CB_PRIV_LEN];
262 };
263
264 typedef void tcf_chain_head_change_t(struct tcf_proto *tp_head, void *priv);
265
266 struct tcf_chain {
267 struct tcf_proto __rcu *filter_chain;
268 tcf_chain_head_change_t *chain_head_change;
269 void *chain_head_change_priv;
270 struct list_head list;
271 struct tcf_block *block;
272 u32 index; /* chain index */
273 unsigned int refcnt;
274 };
275
276 struct tcf_block {
277 struct list_head chain_list;
278 struct net *net;
279 struct Qdisc *q;
280 struct list_head cb_list;
281 struct work_struct work;
282 };
283
284 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
285 {
286 struct qdisc_skb_cb *qcb;
287
288 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
289 BUILD_BUG_ON(sizeof(qcb->data) < sz);
290 }
291
292 static inline int qdisc_qlen(const struct Qdisc *q)
293 {
294 return q->q.qlen;
295 }
296
297 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
298 {
299 return (struct qdisc_skb_cb *)skb->cb;
300 }
301
302 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
303 {
304 return &qdisc->q.lock;
305 }
306
307 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
308 {
309 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
310
311 return q;
312 }
313
314 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
315 {
316 return qdisc->dev_queue->qdisc_sleeping;
317 }
318
319 /* The qdisc root lock is a mechanism by which to top level
320 * of a qdisc tree can be locked from any qdisc node in the
321 * forest. This allows changing the configuration of some
322 * aspect of the qdisc tree while blocking out asynchronous
323 * qdisc access in the packet processing paths.
324 *
325 * It is only legal to do this when the root will not change
326 * on us. Otherwise we'll potentially lock the wrong qdisc
327 * root. This is enforced by holding the RTNL semaphore, which
328 * all users of this lock accessor must do.
329 */
330 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
331 {
332 struct Qdisc *root = qdisc_root(qdisc);
333
334 ASSERT_RTNL();
335 return qdisc_lock(root);
336 }
337
338 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
339 {
340 struct Qdisc *root = qdisc_root_sleeping(qdisc);
341
342 ASSERT_RTNL();
343 return qdisc_lock(root);
344 }
345
346 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
347 {
348 struct Qdisc *root = qdisc_root_sleeping(qdisc);
349
350 ASSERT_RTNL();
351 return &root->running;
352 }
353
354 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
355 {
356 return qdisc->dev_queue->dev;
357 }
358
359 static inline void sch_tree_lock(const struct Qdisc *q)
360 {
361 spin_lock_bh(qdisc_root_sleeping_lock(q));
362 }
363
364 static inline void sch_tree_unlock(const struct Qdisc *q)
365 {
366 spin_unlock_bh(qdisc_root_sleeping_lock(q));
367 }
368
369 extern struct Qdisc noop_qdisc;
370 extern struct Qdisc_ops noop_qdisc_ops;
371 extern struct Qdisc_ops pfifo_fast_ops;
372 extern struct Qdisc_ops mq_qdisc_ops;
373 extern struct Qdisc_ops noqueue_qdisc_ops;
374 extern const struct Qdisc_ops *default_qdisc_ops;
375 static inline const struct Qdisc_ops *
376 get_default_qdisc_ops(const struct net_device *dev, int ntx)
377 {
378 return ntx < dev->real_num_tx_queues ?
379 default_qdisc_ops : &pfifo_fast_ops;
380 }
381
382 struct Qdisc_class_common {
383 u32 classid;
384 struct hlist_node hnode;
385 };
386
387 struct Qdisc_class_hash {
388 struct hlist_head *hash;
389 unsigned int hashsize;
390 unsigned int hashmask;
391 unsigned int hashelems;
392 };
393
394 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
395 {
396 id ^= id >> 8;
397 id ^= id >> 4;
398 return id & mask;
399 }
400
401 static inline struct Qdisc_class_common *
402 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
403 {
404 struct Qdisc_class_common *cl;
405 unsigned int h;
406
407 if (!id)
408 return NULL;
409
410 h = qdisc_class_hash(id, hash->hashmask);
411 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
412 if (cl->classid == id)
413 return cl;
414 }
415 return NULL;
416 }
417
418 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
419 {
420 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
421
422 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
423 }
424
425 int qdisc_class_hash_init(struct Qdisc_class_hash *);
426 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
427 struct Qdisc_class_common *);
428 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
429 struct Qdisc_class_common *);
430 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
431 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
432
433 void dev_init_scheduler(struct net_device *dev);
434 void dev_shutdown(struct net_device *dev);
435 void dev_activate(struct net_device *dev);
436 void dev_deactivate(struct net_device *dev);
437 void dev_deactivate_many(struct list_head *head);
438 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
439 struct Qdisc *qdisc);
440 void qdisc_reset(struct Qdisc *qdisc);
441 void qdisc_destroy(struct Qdisc *qdisc);
442 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
443 unsigned int len);
444 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
445 const struct Qdisc_ops *ops);
446 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
447 const struct Qdisc_ops *ops, u32 parentid);
448 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
449 const struct qdisc_size_table *stab);
450 int skb_do_redirect(struct sk_buff *);
451
452 static inline void skb_reset_tc(struct sk_buff *skb)
453 {
454 #ifdef CONFIG_NET_CLS_ACT
455 skb->tc_redirected = 0;
456 #endif
457 }
458
459 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
460 {
461 #ifdef CONFIG_NET_CLS_ACT
462 return skb->tc_at_ingress;
463 #else
464 return false;
465 #endif
466 }
467
468 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
469 {
470 #ifdef CONFIG_NET_CLS_ACT
471 if (skb->tc_skip_classify) {
472 skb->tc_skip_classify = 0;
473 return true;
474 }
475 #endif
476 return false;
477 }
478
479 /* Reset all TX qdiscs greater then index of a device. */
480 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
481 {
482 struct Qdisc *qdisc;
483
484 for (; i < dev->num_tx_queues; i++) {
485 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
486 if (qdisc) {
487 spin_lock_bh(qdisc_lock(qdisc));
488 qdisc_reset(qdisc);
489 spin_unlock_bh(qdisc_lock(qdisc));
490 }
491 }
492 }
493
494 static inline void qdisc_reset_all_tx(struct net_device *dev)
495 {
496 qdisc_reset_all_tx_gt(dev, 0);
497 }
498
499 /* Are all TX queues of the device empty? */
500 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
501 {
502 unsigned int i;
503
504 rcu_read_lock();
505 for (i = 0; i < dev->num_tx_queues; i++) {
506 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
507 const struct Qdisc *q = rcu_dereference(txq->qdisc);
508
509 if (q->q.qlen) {
510 rcu_read_unlock();
511 return false;
512 }
513 }
514 rcu_read_unlock();
515 return true;
516 }
517
518 /* Are any of the TX qdiscs changing? */
519 static inline bool qdisc_tx_changing(const struct net_device *dev)
520 {
521 unsigned int i;
522
523 for (i = 0; i < dev->num_tx_queues; i++) {
524 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
525 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
526 return true;
527 }
528 return false;
529 }
530
531 /* Is the device using the noop qdisc on all queues? */
532 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
533 {
534 unsigned int i;
535
536 for (i = 0; i < dev->num_tx_queues; i++) {
537 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
538 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
539 return false;
540 }
541 return true;
542 }
543
544 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
545 {
546 return qdisc_skb_cb(skb)->pkt_len;
547 }
548
549 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
550 enum net_xmit_qdisc_t {
551 __NET_XMIT_STOLEN = 0x00010000,
552 __NET_XMIT_BYPASS = 0x00020000,
553 };
554
555 #ifdef CONFIG_NET_CLS_ACT
556 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
557 #else
558 #define net_xmit_drop_count(e) (1)
559 #endif
560
561 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
562 const struct Qdisc *sch)
563 {
564 #ifdef CONFIG_NET_SCHED
565 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
566
567 if (stab)
568 __qdisc_calculate_pkt_len(skb, stab);
569 #endif
570 }
571
572 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
573 struct sk_buff **to_free)
574 {
575 qdisc_calculate_pkt_len(skb, sch);
576 return sch->enqueue(skb, sch, to_free);
577 }
578
579 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
580 {
581 return q->flags & TCQ_F_CPUSTATS;
582 }
583
584 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
585 __u64 bytes, __u32 packets)
586 {
587 bstats->bytes += bytes;
588 bstats->packets += packets;
589 }
590
591 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
592 const struct sk_buff *skb)
593 {
594 _bstats_update(bstats,
595 qdisc_pkt_len(skb),
596 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
597 }
598
599 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
600 __u64 bytes, __u32 packets)
601 {
602 u64_stats_update_begin(&bstats->syncp);
603 _bstats_update(&bstats->bstats, bytes, packets);
604 u64_stats_update_end(&bstats->syncp);
605 }
606
607 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
608 const struct sk_buff *skb)
609 {
610 u64_stats_update_begin(&bstats->syncp);
611 bstats_update(&bstats->bstats, skb);
612 u64_stats_update_end(&bstats->syncp);
613 }
614
615 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
616 const struct sk_buff *skb)
617 {
618 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
619 }
620
621 static inline void qdisc_bstats_update(struct Qdisc *sch,
622 const struct sk_buff *skb)
623 {
624 bstats_update(&sch->bstats, skb);
625 }
626
627 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
628 const struct sk_buff *skb)
629 {
630 sch->qstats.backlog -= qdisc_pkt_len(skb);
631 }
632
633 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
634 const struct sk_buff *skb)
635 {
636 sch->qstats.backlog += qdisc_pkt_len(skb);
637 }
638
639 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
640 {
641 sch->qstats.drops += count;
642 }
643
644 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
645 {
646 qstats->drops++;
647 }
648
649 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
650 {
651 qstats->overlimits++;
652 }
653
654 static inline void qdisc_qstats_drop(struct Qdisc *sch)
655 {
656 qstats_drop_inc(&sch->qstats);
657 }
658
659 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
660 {
661 this_cpu_inc(sch->cpu_qstats->drops);
662 }
663
664 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
665 {
666 sch->qstats.overlimits++;
667 }
668
669 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
670 {
671 qh->head = NULL;
672 qh->tail = NULL;
673 qh->qlen = 0;
674 }
675
676 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
677 struct qdisc_skb_head *qh)
678 {
679 struct sk_buff *last = qh->tail;
680
681 if (last) {
682 skb->next = NULL;
683 last->next = skb;
684 qh->tail = skb;
685 } else {
686 qh->tail = skb;
687 qh->head = skb;
688 }
689 qh->qlen++;
690 qdisc_qstats_backlog_inc(sch, skb);
691
692 return NET_XMIT_SUCCESS;
693 }
694
695 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
696 {
697 return __qdisc_enqueue_tail(skb, sch, &sch->q);
698 }
699
700 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
701 {
702 struct sk_buff *skb = qh->head;
703
704 if (likely(skb != NULL)) {
705 qh->head = skb->next;
706 qh->qlen--;
707 if (qh->head == NULL)
708 qh->tail = NULL;
709 skb->next = NULL;
710 }
711
712 return skb;
713 }
714
715 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
716 {
717 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
718
719 if (likely(skb != NULL)) {
720 qdisc_qstats_backlog_dec(sch, skb);
721 qdisc_bstats_update(sch, skb);
722 }
723
724 return skb;
725 }
726
727 /* Instead of calling kfree_skb() while root qdisc lock is held,
728 * queue the skb for future freeing at end of __dev_xmit_skb()
729 */
730 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
731 {
732 skb->next = *to_free;
733 *to_free = skb;
734 }
735
736 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
737 struct qdisc_skb_head *qh,
738 struct sk_buff **to_free)
739 {
740 struct sk_buff *skb = __qdisc_dequeue_head(qh);
741
742 if (likely(skb != NULL)) {
743 unsigned int len = qdisc_pkt_len(skb);
744
745 qdisc_qstats_backlog_dec(sch, skb);
746 __qdisc_drop(skb, to_free);
747 return len;
748 }
749
750 return 0;
751 }
752
753 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
754 struct sk_buff **to_free)
755 {
756 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
757 }
758
759 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
760 {
761 const struct qdisc_skb_head *qh = &sch->q;
762
763 return qh->head;
764 }
765
766 /* generic pseudo peek method for non-work-conserving qdisc */
767 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
768 {
769 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
770 if (!sch->gso_skb) {
771 sch->gso_skb = sch->dequeue(sch);
772 if (sch->gso_skb) {
773 /* it's still part of the queue */
774 qdisc_qstats_backlog_inc(sch, sch->gso_skb);
775 sch->q.qlen++;
776 }
777 }
778
779 return sch->gso_skb;
780 }
781
782 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
783 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
784 {
785 struct sk_buff *skb = sch->gso_skb;
786
787 if (skb) {
788 sch->gso_skb = NULL;
789 qdisc_qstats_backlog_dec(sch, skb);
790 sch->q.qlen--;
791 } else {
792 skb = sch->dequeue(sch);
793 }
794
795 return skb;
796 }
797
798 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
799 {
800 /*
801 * We do not know the backlog in bytes of this list, it
802 * is up to the caller to correct it
803 */
804 ASSERT_RTNL();
805 if (qh->qlen) {
806 rtnl_kfree_skbs(qh->head, qh->tail);
807
808 qh->head = NULL;
809 qh->tail = NULL;
810 qh->qlen = 0;
811 }
812 }
813
814 static inline void qdisc_reset_queue(struct Qdisc *sch)
815 {
816 __qdisc_reset_queue(&sch->q);
817 sch->qstats.backlog = 0;
818 }
819
820 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
821 struct Qdisc **pold)
822 {
823 struct Qdisc *old;
824
825 sch_tree_lock(sch);
826 old = *pold;
827 *pold = new;
828 if (old != NULL) {
829 unsigned int qlen = old->q.qlen;
830 unsigned int backlog = old->qstats.backlog;
831
832 qdisc_reset(old);
833 qdisc_tree_reduce_backlog(old, qlen, backlog);
834 }
835 sch_tree_unlock(sch);
836
837 return old;
838 }
839
840 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
841 {
842 rtnl_kfree_skbs(skb, skb);
843 qdisc_qstats_drop(sch);
844 }
845
846
847 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
848 struct sk_buff **to_free)
849 {
850 __qdisc_drop(skb, to_free);
851 qdisc_qstats_drop(sch);
852
853 return NET_XMIT_DROP;
854 }
855
856 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
857 long it will take to send a packet given its size.
858 */
859 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
860 {
861 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
862 if (slot < 0)
863 slot = 0;
864 slot >>= rtab->rate.cell_log;
865 if (slot > 255)
866 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
867 return rtab->data[slot];
868 }
869
870 struct psched_ratecfg {
871 u64 rate_bytes_ps; /* bytes per second */
872 u32 mult;
873 u16 overhead;
874 u8 linklayer;
875 u8 shift;
876 };
877
878 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
879 unsigned int len)
880 {
881 len += r->overhead;
882
883 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
884 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
885
886 return ((u64)len * r->mult) >> r->shift;
887 }
888
889 void psched_ratecfg_precompute(struct psched_ratecfg *r,
890 const struct tc_ratespec *conf,
891 u64 rate64);
892
893 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
894 const struct psched_ratecfg *r)
895 {
896 memset(res, 0, sizeof(*res));
897
898 /* legacy struct tc_ratespec has a 32bit @rate field
899 * Qdisc using 64bit rate should add new attributes
900 * in order to maintain compatibility.
901 */
902 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
903
904 res->overhead = r->overhead;
905 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
906 }
907
908 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
909 * The fast path only needs to access filter list and to update stats
910 */
911 struct mini_Qdisc {
912 struct tcf_proto *filter_list;
913 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
914 struct gnet_stats_queue __percpu *cpu_qstats;
915 struct rcu_head rcu;
916 };
917
918 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
919 const struct sk_buff *skb)
920 {
921 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
922 }
923
924 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
925 {
926 this_cpu_inc(miniq->cpu_qstats->drops);
927 }
928
929 struct mini_Qdisc_pair {
930 struct mini_Qdisc miniq1;
931 struct mini_Qdisc miniq2;
932 struct mini_Qdisc __rcu **p_miniq;
933 };
934
935 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
936 struct tcf_proto *tp_head);
937 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
938 struct mini_Qdisc __rcu **p_miniq);
939
940 #endif
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