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dmaengine: imx-sdma: fix size check for sdma script_number
[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_bh(const struct Qdisc *qdisc)
316 {
317 return rcu_dereference_bh(qdisc->dev_queue->qdisc);
318 }
319
320 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
321 {
322 return qdisc->dev_queue->qdisc_sleeping;
323 }
324
325 /* The qdisc root lock is a mechanism by which to top level
326 * of a qdisc tree can be locked from any qdisc node in the
327 * forest. This allows changing the configuration of some
328 * aspect of the qdisc tree while blocking out asynchronous
329 * qdisc access in the packet processing paths.
330 *
331 * It is only legal to do this when the root will not change
332 * on us. Otherwise we'll potentially lock the wrong qdisc
333 * root. This is enforced by holding the RTNL semaphore, which
334 * all users of this lock accessor must do.
335 */
336 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
337 {
338 struct Qdisc *root = qdisc_root(qdisc);
339
340 ASSERT_RTNL();
341 return qdisc_lock(root);
342 }
343
344 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
345 {
346 struct Qdisc *root = qdisc_root_sleeping(qdisc);
347
348 ASSERT_RTNL();
349 return qdisc_lock(root);
350 }
351
352 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
353 {
354 struct Qdisc *root = qdisc_root_sleeping(qdisc);
355
356 ASSERT_RTNL();
357 return &root->running;
358 }
359
360 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
361 {
362 return qdisc->dev_queue->dev;
363 }
364
365 static inline void sch_tree_lock(const struct Qdisc *q)
366 {
367 spin_lock_bh(qdisc_root_sleeping_lock(q));
368 }
369
370 static inline void sch_tree_unlock(const struct Qdisc *q)
371 {
372 spin_unlock_bh(qdisc_root_sleeping_lock(q));
373 }
374
375 extern struct Qdisc noop_qdisc;
376 extern struct Qdisc_ops noop_qdisc_ops;
377 extern struct Qdisc_ops pfifo_fast_ops;
378 extern struct Qdisc_ops mq_qdisc_ops;
379 extern struct Qdisc_ops noqueue_qdisc_ops;
380 extern const struct Qdisc_ops *default_qdisc_ops;
381 static inline const struct Qdisc_ops *
382 get_default_qdisc_ops(const struct net_device *dev, int ntx)
383 {
384 return ntx < dev->real_num_tx_queues ?
385 default_qdisc_ops : &pfifo_fast_ops;
386 }
387
388 struct Qdisc_class_common {
389 u32 classid;
390 struct hlist_node hnode;
391 };
392
393 struct Qdisc_class_hash {
394 struct hlist_head *hash;
395 unsigned int hashsize;
396 unsigned int hashmask;
397 unsigned int hashelems;
398 };
399
400 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
401 {
402 id ^= id >> 8;
403 id ^= id >> 4;
404 return id & mask;
405 }
406
407 static inline struct Qdisc_class_common *
408 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
409 {
410 struct Qdisc_class_common *cl;
411 unsigned int h;
412
413 if (!id)
414 return NULL;
415
416 h = qdisc_class_hash(id, hash->hashmask);
417 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
418 if (cl->classid == id)
419 return cl;
420 }
421 return NULL;
422 }
423
424 static inline int tc_classid_to_hwtc(struct net_device *dev, u32 classid)
425 {
426 u32 hwtc = TC_H_MIN(classid) - TC_H_MIN_PRIORITY;
427
428 return (hwtc < netdev_get_num_tc(dev)) ? hwtc : -EINVAL;
429 }
430
431 int qdisc_class_hash_init(struct Qdisc_class_hash *);
432 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
433 struct Qdisc_class_common *);
434 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
435 struct Qdisc_class_common *);
436 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
437 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
438
439 void dev_init_scheduler(struct net_device *dev);
440 void dev_shutdown(struct net_device *dev);
441 void dev_activate(struct net_device *dev);
442 void dev_deactivate(struct net_device *dev);
443 void dev_deactivate_many(struct list_head *head);
444 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
445 struct Qdisc *qdisc);
446 void qdisc_reset(struct Qdisc *qdisc);
447 void qdisc_destroy(struct Qdisc *qdisc);
448 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
449 unsigned int len);
450 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
451 const struct Qdisc_ops *ops);
452 void qdisc_free(struct Qdisc *qdisc);
453 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
454 const struct Qdisc_ops *ops, u32 parentid);
455 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
456 const struct qdisc_size_table *stab);
457 int skb_do_redirect(struct sk_buff *);
458
459 static inline void skb_reset_tc(struct sk_buff *skb)
460 {
461 #ifdef CONFIG_NET_CLS_ACT
462 skb->tc_redirected = 0;
463 #endif
464 }
465
466 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
467 {
468 #ifdef CONFIG_NET_CLS_ACT
469 return skb->tc_at_ingress;
470 #else
471 return false;
472 #endif
473 }
474
475 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
476 {
477 #ifdef CONFIG_NET_CLS_ACT
478 if (skb->tc_skip_classify) {
479 skb->tc_skip_classify = 0;
480 return true;
481 }
482 #endif
483 return false;
484 }
485
486 /* Reset all TX qdiscs greater then index of a device. */
487 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
488 {
489 struct Qdisc *qdisc;
490
491 for (; i < dev->num_tx_queues; i++) {
492 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
493 if (qdisc) {
494 spin_lock_bh(qdisc_lock(qdisc));
495 qdisc_reset(qdisc);
496 spin_unlock_bh(qdisc_lock(qdisc));
497 }
498 }
499 }
500
501 static inline void qdisc_reset_all_tx(struct net_device *dev)
502 {
503 qdisc_reset_all_tx_gt(dev, 0);
504 }
505
506 /* Are all TX queues of the device empty? */
507 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
508 {
509 unsigned int i;
510
511 rcu_read_lock();
512 for (i = 0; i < dev->num_tx_queues; i++) {
513 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
514 const struct Qdisc *q = rcu_dereference(txq->qdisc);
515
516 if (q->q.qlen) {
517 rcu_read_unlock();
518 return false;
519 }
520 }
521 rcu_read_unlock();
522 return true;
523 }
524
525 /* Are any of the TX qdiscs changing? */
526 static inline bool qdisc_tx_changing(const struct net_device *dev)
527 {
528 unsigned int i;
529
530 for (i = 0; i < dev->num_tx_queues; i++) {
531 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
532 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
533 return true;
534 }
535 return false;
536 }
537
538 /* Is the device using the noop qdisc on all queues? */
539 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
540 {
541 unsigned int i;
542
543 for (i = 0; i < dev->num_tx_queues; i++) {
544 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
545 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
546 return false;
547 }
548 return true;
549 }
550
551 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
552 {
553 return qdisc_skb_cb(skb)->pkt_len;
554 }
555
556 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
557 enum net_xmit_qdisc_t {
558 __NET_XMIT_STOLEN = 0x00010000,
559 __NET_XMIT_BYPASS = 0x00020000,
560 };
561
562 #ifdef CONFIG_NET_CLS_ACT
563 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
564 #else
565 #define net_xmit_drop_count(e) (1)
566 #endif
567
568 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
569 const struct Qdisc *sch)
570 {
571 #ifdef CONFIG_NET_SCHED
572 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
573
574 if (stab)
575 __qdisc_calculate_pkt_len(skb, stab);
576 #endif
577 }
578
579 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
580 struct sk_buff **to_free)
581 {
582 qdisc_calculate_pkt_len(skb, sch);
583 return sch->enqueue(skb, sch, to_free);
584 }
585
586 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
587 {
588 return q->flags & TCQ_F_CPUSTATS;
589 }
590
591 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
592 __u64 bytes, __u32 packets)
593 {
594 bstats->bytes += bytes;
595 bstats->packets += packets;
596 }
597
598 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
599 const struct sk_buff *skb)
600 {
601 _bstats_update(bstats,
602 qdisc_pkt_len(skb),
603 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
604 }
605
606 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
607 __u64 bytes, __u32 packets)
608 {
609 u64_stats_update_begin(&bstats->syncp);
610 _bstats_update(&bstats->bstats, bytes, packets);
611 u64_stats_update_end(&bstats->syncp);
612 }
613
614 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
615 const struct sk_buff *skb)
616 {
617 u64_stats_update_begin(&bstats->syncp);
618 bstats_update(&bstats->bstats, skb);
619 u64_stats_update_end(&bstats->syncp);
620 }
621
622 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
623 const struct sk_buff *skb)
624 {
625 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
626 }
627
628 static inline void qdisc_bstats_update(struct Qdisc *sch,
629 const struct sk_buff *skb)
630 {
631 bstats_update(&sch->bstats, skb);
632 }
633
634 static inline void qdisc_qstats_backlog_dec(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_backlog_inc(struct Qdisc *sch,
641 const struct sk_buff *skb)
642 {
643 sch->qstats.backlog += qdisc_pkt_len(skb);
644 }
645
646 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
647 {
648 sch->qstats.drops += count;
649 }
650
651 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
652 {
653 qstats->drops++;
654 }
655
656 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
657 {
658 qstats->overlimits++;
659 }
660
661 static inline void qdisc_qstats_drop(struct Qdisc *sch)
662 {
663 qstats_drop_inc(&sch->qstats);
664 }
665
666 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
667 {
668 this_cpu_inc(sch->cpu_qstats->drops);
669 }
670
671 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
672 {
673 sch->qstats.overlimits++;
674 }
675
676 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
677 {
678 qh->head = NULL;
679 qh->tail = NULL;
680 qh->qlen = 0;
681 }
682
683 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
684 struct qdisc_skb_head *qh)
685 {
686 struct sk_buff *last = qh->tail;
687
688 if (last) {
689 skb->next = NULL;
690 last->next = skb;
691 qh->tail = skb;
692 } else {
693 qh->tail = skb;
694 qh->head = skb;
695 }
696 qh->qlen++;
697 qdisc_qstats_backlog_inc(sch, skb);
698
699 return NET_XMIT_SUCCESS;
700 }
701
702 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
703 {
704 return __qdisc_enqueue_tail(skb, sch, &sch->q);
705 }
706
707 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
708 {
709 struct sk_buff *skb = qh->head;
710
711 if (likely(skb != NULL)) {
712 qh->head = skb->next;
713 qh->qlen--;
714 if (qh->head == NULL)
715 qh->tail = NULL;
716 skb->next = NULL;
717 }
718
719 return skb;
720 }
721
722 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
723 {
724 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
725
726 if (likely(skb != NULL)) {
727 qdisc_qstats_backlog_dec(sch, skb);
728 qdisc_bstats_update(sch, skb);
729 }
730
731 return skb;
732 }
733
734 /* Instead of calling kfree_skb() while root qdisc lock is held,
735 * queue the skb for future freeing at end of __dev_xmit_skb()
736 */
737 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
738 {
739 skb->next = *to_free;
740 *to_free = skb;
741 }
742
743 static inline void __qdisc_drop_all(struct sk_buff *skb,
744 struct sk_buff **to_free)
745 {
746 if (skb->prev)
747 skb->prev->next = *to_free;
748 else
749 skb->next = *to_free;
750 *to_free = skb;
751 }
752
753 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
754 struct qdisc_skb_head *qh,
755 struct sk_buff **to_free)
756 {
757 struct sk_buff *skb = __qdisc_dequeue_head(qh);
758
759 if (likely(skb != NULL)) {
760 unsigned int len = qdisc_pkt_len(skb);
761
762 qdisc_qstats_backlog_dec(sch, skb);
763 __qdisc_drop(skb, to_free);
764 return len;
765 }
766
767 return 0;
768 }
769
770 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
771 struct sk_buff **to_free)
772 {
773 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
774 }
775
776 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
777 {
778 const struct qdisc_skb_head *qh = &sch->q;
779
780 return qh->head;
781 }
782
783 /* generic pseudo peek method for non-work-conserving qdisc */
784 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
785 {
786 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
787 if (!sch->gso_skb) {
788 sch->gso_skb = sch->dequeue(sch);
789 if (sch->gso_skb) {
790 /* it's still part of the queue */
791 qdisc_qstats_backlog_inc(sch, sch->gso_skb);
792 sch->q.qlen++;
793 }
794 }
795
796 return sch->gso_skb;
797 }
798
799 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
800 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
801 {
802 struct sk_buff *skb = sch->gso_skb;
803
804 if (skb) {
805 sch->gso_skb = NULL;
806 qdisc_qstats_backlog_dec(sch, skb);
807 sch->q.qlen--;
808 } else {
809 skb = sch->dequeue(sch);
810 }
811
812 return skb;
813 }
814
815 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
816 {
817 /*
818 * We do not know the backlog in bytes of this list, it
819 * is up to the caller to correct it
820 */
821 ASSERT_RTNL();
822 if (qh->qlen) {
823 rtnl_kfree_skbs(qh->head, qh->tail);
824
825 qh->head = NULL;
826 qh->tail = NULL;
827 qh->qlen = 0;
828 }
829 }
830
831 static inline void qdisc_reset_queue(struct Qdisc *sch)
832 {
833 __qdisc_reset_queue(&sch->q);
834 sch->qstats.backlog = 0;
835 }
836
837 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
838 struct Qdisc **pold)
839 {
840 struct Qdisc *old;
841
842 sch_tree_lock(sch);
843 old = *pold;
844 *pold = new;
845 if (old != NULL) {
846 unsigned int qlen = old->q.qlen;
847 unsigned int backlog = old->qstats.backlog;
848
849 qdisc_reset(old);
850 qdisc_tree_reduce_backlog(old, qlen, backlog);
851 }
852 sch_tree_unlock(sch);
853
854 return old;
855 }
856
857 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
858 {
859 rtnl_kfree_skbs(skb, skb);
860 qdisc_qstats_drop(sch);
861 }
862
863
864 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
865 struct sk_buff **to_free)
866 {
867 __qdisc_drop(skb, to_free);
868 qdisc_qstats_drop(sch);
869
870 return NET_XMIT_DROP;
871 }
872
873 static inline int qdisc_drop_all(struct sk_buff *skb, struct Qdisc *sch,
874 struct sk_buff **to_free)
875 {
876 __qdisc_drop_all(skb, to_free);
877 qdisc_qstats_drop(sch);
878
879 return NET_XMIT_DROP;
880 }
881
882 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
883 long it will take to send a packet given its size.
884 */
885 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
886 {
887 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
888 if (slot < 0)
889 slot = 0;
890 slot >>= rtab->rate.cell_log;
891 if (slot > 255)
892 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
893 return rtab->data[slot];
894 }
895
896 struct psched_ratecfg {
897 u64 rate_bytes_ps; /* bytes per second */
898 u32 mult;
899 u16 overhead;
900 u8 linklayer;
901 u8 shift;
902 };
903
904 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
905 unsigned int len)
906 {
907 len += r->overhead;
908
909 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
910 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
911
912 return ((u64)len * r->mult) >> r->shift;
913 }
914
915 void psched_ratecfg_precompute(struct psched_ratecfg *r,
916 const struct tc_ratespec *conf,
917 u64 rate64);
918
919 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
920 const struct psched_ratecfg *r)
921 {
922 memset(res, 0, sizeof(*res));
923
924 /* legacy struct tc_ratespec has a 32bit @rate field
925 * Qdisc using 64bit rate should add new attributes
926 * in order to maintain compatibility.
927 */
928 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
929
930 res->overhead = r->overhead;
931 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
932 }
933
934 /* Mini Qdisc serves for specific needs of ingress/clsact Qdisc.
935 * The fast path only needs to access filter list and to update stats
936 */
937 struct mini_Qdisc {
938 struct tcf_proto *filter_list;
939 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
940 struct gnet_stats_queue __percpu *cpu_qstats;
941 struct rcu_head rcu;
942 };
943
944 static inline void mini_qdisc_bstats_cpu_update(struct mini_Qdisc *miniq,
945 const struct sk_buff *skb)
946 {
947 bstats_cpu_update(this_cpu_ptr(miniq->cpu_bstats), skb);
948 }
949
950 static inline void mini_qdisc_qstats_cpu_drop(struct mini_Qdisc *miniq)
951 {
952 this_cpu_inc(miniq->cpu_qstats->drops);
953 }
954
955 struct mini_Qdisc_pair {
956 struct mini_Qdisc miniq1;
957 struct mini_Qdisc miniq2;
958 struct mini_Qdisc __rcu **p_miniq;
959 };
960
961 void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
962 struct tcf_proto *tp_head);
963 void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
964 struct mini_Qdisc __rcu **p_miniq);
965
966 #endif
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