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x86/mpx: Correctly report do_mpx_bt_fault() failures to user-space
[linux/fpc-iii.git] / include / net / sch_generic.h
blobaeec4086afb2446dadb1fb8c54ad54a909634380
1 #ifndef __NET_SCHED_GENERIC_H
2 #define __NET_SCHED_GENERIC_H
3
4 #include <linux/netdevice.h>
5 #include <linux/types.h>
6 #include <linux/rcupdate.h>
7 #include <linux/pkt_sched.h>
8 #include <linux/pkt_cls.h>
9 #include <linux/percpu.h>
10 #include <linux/dynamic_queue_limits.h>
11 #include <net/gen_stats.h>
12 #include <net/rtnetlink.h>
13
14 struct Qdisc_ops;
15 struct qdisc_walker;
16 struct tcf_walker;
17 struct module;
18
19 struct qdisc_rate_table {
20 struct tc_ratespec rate;
21 u32 data[256];
22 struct qdisc_rate_table *next;
23 int refcnt;
24 };
25
26 enum qdisc_state_t {
27 __QDISC_STATE_SCHED,
28 __QDISC_STATE_DEACTIVATED,
29 };
30
31 struct qdisc_size_table {
32 struct rcu_head rcu;
33 struct list_head list;
34 struct tc_sizespec szopts;
35 int refcnt;
36 u16 data[];
37 };
38
39 /* similar to sk_buff_head, but skb->prev pointer is undefined. */
40 struct qdisc_skb_head {
41 struct sk_buff *head;
42 struct sk_buff *tail;
43 __u32 qlen;
44 spinlock_t lock;
45 };
46
47 struct Qdisc {
48 int (*enqueue)(struct sk_buff *skb,
49 struct Qdisc *sch,
50 struct sk_buff **to_free);
51 struct sk_buff * (*dequeue)(struct Qdisc *sch);
52 unsigned int flags;
53 #define TCQ_F_BUILTIN 1
54 #define TCQ_F_INGRESS 2
55 #define TCQ_F_CAN_BYPASS 4
56 #define TCQ_F_MQROOT 8
57 #define TCQ_F_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
58 * q->dev_queue : It can test
59 * netif_xmit_frozen_or_stopped() before
60 * dequeueing next packet.
61 * Its true for MQ/MQPRIO slaves, or non
62 * multiqueue device.
63 */
64 #define TCQ_F_WARN_NONWC (1 << 16)
65 #define TCQ_F_CPUSTATS 0x20 /* run using percpu statistics */
66 #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy :
67 * qdisc_tree_decrease_qlen() should stop.
68 */
69 u32 limit;
70 const struct Qdisc_ops *ops;
71 struct qdisc_size_table __rcu *stab;
72 struct hlist_node hash;
73 u32 handle;
74 u32 parent;
75 void *u32_node;
76
77 struct netdev_queue *dev_queue;
78
79 struct net_rate_estimator __rcu *rate_est;
80 struct gnet_stats_basic_cpu __percpu *cpu_bstats;
81 struct gnet_stats_queue __percpu *cpu_qstats;
82
83 /*
84 * For performance sake on SMP, we put highly modified fields at the end
85 */
86 struct sk_buff *gso_skb ____cacheline_aligned_in_smp;
87 struct qdisc_skb_head q;
88 struct gnet_stats_basic_packed bstats;
89 seqcount_t running;
90 struct gnet_stats_queue qstats;
91 unsigned long state;
92 struct Qdisc *next_sched;
93 struct sk_buff *skb_bad_txq;
94 struct rcu_head rcu_head;
95 int padded;
96 atomic_t refcnt;
97
98 spinlock_t busylock ____cacheline_aligned_in_smp;
99 };
100
101 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
102 {
103 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
104 }
105
106 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
107 {
108 if (qdisc_is_running(qdisc))
109 return false;
110 /* Variant of write_seqcount_begin() telling lockdep a trylock
111 * was attempted.
112 */
113 raw_write_seqcount_begin(&qdisc->running);
114 seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
115 return true;
116 }
117
118 static inline void qdisc_run_end(struct Qdisc *qdisc)
119 {
120 write_seqcount_end(&qdisc->running);
121 }
122
123 static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
124 {
125 return qdisc->flags & TCQ_F_ONETXQUEUE;
126 }
127
128 static inline int qdisc_avail_bulklimit(const struct netdev_queue *txq)
129 {
130 #ifdef CONFIG_BQL
131 /* Non-BQL migrated drivers will return 0, too. */
132 return dql_avail(&txq->dql);
133 #else
134 return 0;
135 #endif
136 }
137
138 struct Qdisc_class_ops {
139 /* Child qdisc manipulation */
140 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
141 int (*graft)(struct Qdisc *, unsigned long cl,
142 struct Qdisc *, struct Qdisc **);
143 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
144 void (*qlen_notify)(struct Qdisc *, unsigned long);
145
146 /* Class manipulation routines */
147 unsigned long (*get)(struct Qdisc *, u32 classid);
148 void (*put)(struct Qdisc *, unsigned long);
149 int (*change)(struct Qdisc *, u32, u32,
150 struct nlattr **, unsigned long *);
151 int (*delete)(struct Qdisc *, unsigned long);
152 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
153
154 /* Filter manipulation */
155 struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long);
156 bool (*tcf_cl_offload)(u32 classid);
157 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
158 u32 classid);
159 void (*unbind_tcf)(struct Qdisc *, unsigned long);
160
161 /* rtnetlink specific */
162 int (*dump)(struct Qdisc *, unsigned long,
163 struct sk_buff *skb, struct tcmsg*);
164 int (*dump_stats)(struct Qdisc *, unsigned long,
165 struct gnet_dump *);
166 };
167
168 struct Qdisc_ops {
169 struct Qdisc_ops *next;
170 const struct Qdisc_class_ops *cl_ops;
171 char id[IFNAMSIZ];
172 int priv_size;
173
174 int (*enqueue)(struct sk_buff *skb,
175 struct Qdisc *sch,
176 struct sk_buff **to_free);
177 struct sk_buff * (*dequeue)(struct Qdisc *);
178 struct sk_buff * (*peek)(struct Qdisc *);
179
180 int (*init)(struct Qdisc *, struct nlattr *arg);
181 void (*reset)(struct Qdisc *);
182 void (*destroy)(struct Qdisc *);
183 int (*change)(struct Qdisc *, struct nlattr *arg);
184 void (*attach)(struct Qdisc *);
185
186 int (*dump)(struct Qdisc *, struct sk_buff *);
187 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
188
189 struct module *owner;
190 };
191
192
193 struct tcf_result {
194 unsigned long class;
195 u32 classid;
196 };
197
198 struct tcf_proto_ops {
199 struct list_head head;
200 char kind[IFNAMSIZ];
201
202 int (*classify)(struct sk_buff *,
203 const struct tcf_proto *,
204 struct tcf_result *);
205 int (*init)(struct tcf_proto*);
206 bool (*destroy)(struct tcf_proto*, bool);
207
208 unsigned long (*get)(struct tcf_proto*, u32 handle);
209 int (*change)(struct net *net, struct sk_buff *,
210 struct tcf_proto*, unsigned long,
211 u32 handle, struct nlattr **,
212 unsigned long *, bool);
213 int (*delete)(struct tcf_proto*, unsigned long);
214 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
215
216 /* rtnetlink specific */
217 int (*dump)(struct net*, struct tcf_proto*, unsigned long,
218 struct sk_buff *skb, struct tcmsg*);
219
220 struct module *owner;
221 };
222
223 struct tcf_proto {
224 /* Fast access part */
225 struct tcf_proto __rcu *next;
226 void __rcu *root;
227 int (*classify)(struct sk_buff *,
228 const struct tcf_proto *,
229 struct tcf_result *);
230 __be16 protocol;
231
232 /* All the rest */
233 u32 prio;
234 u32 classid;
235 struct Qdisc *q;
236 void *data;
237 const struct tcf_proto_ops *ops;
238 struct rcu_head rcu;
239 };
240
241 struct qdisc_skb_cb {
242 unsigned int pkt_len;
243 u16 slave_dev_queue_mapping;
244 u16 tc_classid;
245 #define QDISC_CB_PRIV_LEN 20
246 unsigned char data[QDISC_CB_PRIV_LEN];
247 };
248
249 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
250 {
251 struct qdisc_skb_cb *qcb;
252
253 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
254 BUILD_BUG_ON(sizeof(qcb->data) < sz);
255 }
256
257 static inline int qdisc_qlen(const struct Qdisc *q)
258 {
259 return q->q.qlen;
260 }
261
262 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
263 {
264 return (struct qdisc_skb_cb *)skb->cb;
265 }
266
267 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
268 {
269 return &qdisc->q.lock;
270 }
271
272 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
273 {
274 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
275
276 return q;
277 }
278
279 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
280 {
281 return qdisc->dev_queue->qdisc_sleeping;
282 }
283
284 /* The qdisc root lock is a mechanism by which to top level
285 * of a qdisc tree can be locked from any qdisc node in the
286 * forest. This allows changing the configuration of some
287 * aspect of the qdisc tree while blocking out asynchronous
288 * qdisc access in the packet processing paths.
289 *
290 * It is only legal to do this when the root will not change
291 * on us. Otherwise we'll potentially lock the wrong qdisc
292 * root. This is enforced by holding the RTNL semaphore, which
293 * all users of this lock accessor must do.
294 */
295 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
296 {
297 struct Qdisc *root = qdisc_root(qdisc);
298
299 ASSERT_RTNL();
300 return qdisc_lock(root);
301 }
302
303 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
304 {
305 struct Qdisc *root = qdisc_root_sleeping(qdisc);
306
307 ASSERT_RTNL();
308 return qdisc_lock(root);
309 }
310
311 static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
312 {
313 struct Qdisc *root = qdisc_root_sleeping(qdisc);
314
315 ASSERT_RTNL();
316 return &root->running;
317 }
318
319 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
320 {
321 return qdisc->dev_queue->dev;
322 }
323
324 static inline void sch_tree_lock(const struct Qdisc *q)
325 {
326 spin_lock_bh(qdisc_root_sleeping_lock(q));
327 }
328
329 static inline void sch_tree_unlock(const struct Qdisc *q)
330 {
331 spin_unlock_bh(qdisc_root_sleeping_lock(q));
332 }
333
334 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
335 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
336
337 extern struct Qdisc noop_qdisc;
338 extern struct Qdisc_ops noop_qdisc_ops;
339 extern struct Qdisc_ops pfifo_fast_ops;
340 extern struct Qdisc_ops mq_qdisc_ops;
341 extern struct Qdisc_ops noqueue_qdisc_ops;
342 extern const struct Qdisc_ops *default_qdisc_ops;
343 static inline const struct Qdisc_ops *
344 get_default_qdisc_ops(const struct net_device *dev, int ntx)
345 {
346 return ntx < dev->real_num_tx_queues ?
347 default_qdisc_ops : &pfifo_fast_ops;
348 }
349
350 struct Qdisc_class_common {
351 u32 classid;
352 struct hlist_node hnode;
353 };
354
355 struct Qdisc_class_hash {
356 struct hlist_head *hash;
357 unsigned int hashsize;
358 unsigned int hashmask;
359 unsigned int hashelems;
360 };
361
362 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
363 {
364 id ^= id >> 8;
365 id ^= id >> 4;
366 return id & mask;
367 }
368
369 static inline struct Qdisc_class_common *
370 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
371 {
372 struct Qdisc_class_common *cl;
373 unsigned int h;
374
375 h = qdisc_class_hash(id, hash->hashmask);
376 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
377 if (cl->classid == id)
378 return cl;
379 }
380 return NULL;
381 }
382
383 int qdisc_class_hash_init(struct Qdisc_class_hash *);
384 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
385 struct Qdisc_class_common *);
386 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
387 struct Qdisc_class_common *);
388 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
389 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
390
391 void dev_init_scheduler(struct net_device *dev);
392 void dev_shutdown(struct net_device *dev);
393 void dev_activate(struct net_device *dev);
394 void dev_deactivate(struct net_device *dev);
395 void dev_deactivate_many(struct list_head *head);
396 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
397 struct Qdisc *qdisc);
398 void qdisc_reset(struct Qdisc *qdisc);
399 void qdisc_destroy(struct Qdisc *qdisc);
400 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
401 unsigned int len);
402 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
403 const struct Qdisc_ops *ops);
404 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
405 const struct Qdisc_ops *ops, u32 parentid);
406 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
407 const struct qdisc_size_table *stab);
408 int skb_do_redirect(struct sk_buff *);
409
410 static inline void skb_reset_tc(struct sk_buff *skb)
411 {
412 #ifdef CONFIG_NET_CLS_ACT
413 skb->tc_redirected = 0;
414 #endif
415 }
416
417 static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
418 {
419 #ifdef CONFIG_NET_CLS_ACT
420 return skb->tc_at_ingress;
421 #else
422 return false;
423 #endif
424 }
425
426 static inline bool skb_skip_tc_classify(struct sk_buff *skb)
427 {
428 #ifdef CONFIG_NET_CLS_ACT
429 if (skb->tc_skip_classify) {
430 skb->tc_skip_classify = 0;
431 return true;
432 }
433 #endif
434 return false;
435 }
436
437 /* Reset all TX qdiscs greater then index of a device. */
438 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
439 {
440 struct Qdisc *qdisc;
441
442 for (; i < dev->num_tx_queues; i++) {
443 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
444 if (qdisc) {
445 spin_lock_bh(qdisc_lock(qdisc));
446 qdisc_reset(qdisc);
447 spin_unlock_bh(qdisc_lock(qdisc));
448 }
449 }
450 }
451
452 static inline void qdisc_reset_all_tx(struct net_device *dev)
453 {
454 qdisc_reset_all_tx_gt(dev, 0);
455 }
456
457 /* Are all TX queues of the device empty? */
458 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
459 {
460 unsigned int i;
461
462 rcu_read_lock();
463 for (i = 0; i < dev->num_tx_queues; i++) {
464 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
465 const struct Qdisc *q = rcu_dereference(txq->qdisc);
466
467 if (q->q.qlen) {
468 rcu_read_unlock();
469 return false;
470 }
471 }
472 rcu_read_unlock();
473 return true;
474 }
475
476 /* Are any of the TX qdiscs changing? */
477 static inline bool qdisc_tx_changing(const struct net_device *dev)
478 {
479 unsigned int i;
480
481 for (i = 0; i < dev->num_tx_queues; i++) {
482 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
483 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
484 return true;
485 }
486 return false;
487 }
488
489 /* Is the device using the noop qdisc on all queues? */
490 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
491 {
492 unsigned int i;
493
494 for (i = 0; i < dev->num_tx_queues; i++) {
495 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
496 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
497 return false;
498 }
499 return true;
500 }
501
502 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
503 {
504 return qdisc_skb_cb(skb)->pkt_len;
505 }
506
507 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
508 enum net_xmit_qdisc_t {
509 __NET_XMIT_STOLEN = 0x00010000,
510 __NET_XMIT_BYPASS = 0x00020000,
511 };
512
513 #ifdef CONFIG_NET_CLS_ACT
514 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
515 #else
516 #define net_xmit_drop_count(e) (1)
517 #endif
518
519 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
520 const struct Qdisc *sch)
521 {
522 #ifdef CONFIG_NET_SCHED
523 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
524
525 if (stab)
526 __qdisc_calculate_pkt_len(skb, stab);
527 #endif
528 }
529
530 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
531 struct sk_buff **to_free)
532 {
533 qdisc_calculate_pkt_len(skb, sch);
534 return sch->enqueue(skb, sch, to_free);
535 }
536
537 static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
538 {
539 return q->flags & TCQ_F_CPUSTATS;
540 }
541
542 static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
543 __u64 bytes, __u32 packets)
544 {
545 bstats->bytes += bytes;
546 bstats->packets += packets;
547 }
548
549 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
550 const struct sk_buff *skb)
551 {
552 _bstats_update(bstats,
553 qdisc_pkt_len(skb),
554 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
555 }
556
557 static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
558 __u64 bytes, __u32 packets)
559 {
560 u64_stats_update_begin(&bstats->syncp);
561 _bstats_update(&bstats->bstats, bytes, packets);
562 u64_stats_update_end(&bstats->syncp);
563 }
564
565 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
566 const struct sk_buff *skb)
567 {
568 u64_stats_update_begin(&bstats->syncp);
569 bstats_update(&bstats->bstats, skb);
570 u64_stats_update_end(&bstats->syncp);
571 }
572
573 static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
574 const struct sk_buff *skb)
575 {
576 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
577 }
578
579 static inline void qdisc_bstats_update(struct Qdisc *sch,
580 const struct sk_buff *skb)
581 {
582 bstats_update(&sch->bstats, skb);
583 }
584
585 static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
586 const struct sk_buff *skb)
587 {
588 sch->qstats.backlog -= qdisc_pkt_len(skb);
589 }
590
591 static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
592 const struct sk_buff *skb)
593 {
594 sch->qstats.backlog += qdisc_pkt_len(skb);
595 }
596
597 static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
598 {
599 sch->qstats.drops += count;
600 }
601
602 static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
603 {
604 qstats->drops++;
605 }
606
607 static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
608 {
609 qstats->overlimits++;
610 }
611
612 static inline void qdisc_qstats_drop(struct Qdisc *sch)
613 {
614 qstats_drop_inc(&sch->qstats);
615 }
616
617 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
618 {
619 this_cpu_inc(sch->cpu_qstats->drops);
620 }
621
622 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
623 {
624 sch->qstats.overlimits++;
625 }
626
627 static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
628 {
629 qh->head = NULL;
630 qh->tail = NULL;
631 qh->qlen = 0;
632 }
633
634 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
635 struct qdisc_skb_head *qh)
636 {
637 struct sk_buff *last = qh->tail;
638
639 if (last) {
640 skb->next = NULL;
641 last->next = skb;
642 qh->tail = skb;
643 } else {
644 qh->tail = skb;
645 qh->head = skb;
646 }
647 qh->qlen++;
648 qdisc_qstats_backlog_inc(sch, skb);
649
650 return NET_XMIT_SUCCESS;
651 }
652
653 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
654 {
655 return __qdisc_enqueue_tail(skb, sch, &sch->q);
656 }
657
658 static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
659 {
660 struct sk_buff *skb = qh->head;
661
662 if (likely(skb != NULL)) {
663 qh->head = skb->next;
664 qh->qlen--;
665 if (qh->head == NULL)
666 qh->tail = NULL;
667 skb->next = NULL;
668 }
669
670 return skb;
671 }
672
673 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
674 {
675 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
676
677 if (likely(skb != NULL)) {
678 qdisc_qstats_backlog_dec(sch, skb);
679 qdisc_bstats_update(sch, skb);
680 }
681
682 return skb;
683 }
684
685 /* Instead of calling kfree_skb() while root qdisc lock is held,
686 * queue the skb for future freeing at end of __dev_xmit_skb()
687 */
688 static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
689 {
690 skb->next = *to_free;
691 *to_free = skb;
692 }
693
694 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
695 struct qdisc_skb_head *qh,
696 struct sk_buff **to_free)
697 {
698 struct sk_buff *skb = __qdisc_dequeue_head(qh);
699
700 if (likely(skb != NULL)) {
701 unsigned int len = qdisc_pkt_len(skb);
702
703 qdisc_qstats_backlog_dec(sch, skb);
704 __qdisc_drop(skb, to_free);
705 return len;
706 }
707
708 return 0;
709 }
710
711 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
712 struct sk_buff **to_free)
713 {
714 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
715 }
716
717 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
718 {
719 const struct qdisc_skb_head *qh = &sch->q;
720
721 return qh->head;
722 }
723
724 /* generic pseudo peek method for non-work-conserving qdisc */
725 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
726 {
727 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
728 if (!sch->gso_skb) {
729 sch->gso_skb = sch->dequeue(sch);
730 if (sch->gso_skb) {
731 /* it's still part of the queue */
732 qdisc_qstats_backlog_inc(sch, sch->gso_skb);
733 sch->q.qlen++;
734 }
735 }
736
737 return sch->gso_skb;
738 }
739
740 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
741 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
742 {
743 struct sk_buff *skb = sch->gso_skb;
744
745 if (skb) {
746 sch->gso_skb = NULL;
747 qdisc_qstats_backlog_dec(sch, skb);
748 sch->q.qlen--;
749 } else {
750 skb = sch->dequeue(sch);
751 }
752
753 return skb;
754 }
755
756 static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
757 {
758 /*
759 * We do not know the backlog in bytes of this list, it
760 * is up to the caller to correct it
761 */
762 ASSERT_RTNL();
763 if (qh->qlen) {
764 rtnl_kfree_skbs(qh->head, qh->tail);
765
766 qh->head = NULL;
767 qh->tail = NULL;
768 qh->qlen = 0;
769 }
770 }
771
772 static inline void qdisc_reset_queue(struct Qdisc *sch)
773 {
774 __qdisc_reset_queue(&sch->q);
775 sch->qstats.backlog = 0;
776 }
777
778 static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
779 struct Qdisc **pold)
780 {
781 struct Qdisc *old;
782
783 sch_tree_lock(sch);
784 old = *pold;
785 *pold = new;
786 if (old != NULL) {
787 qdisc_tree_reduce_backlog(old, old->q.qlen, old->qstats.backlog);
788 qdisc_reset(old);
789 }
790 sch_tree_unlock(sch);
791
792 return old;
793 }
794
795 static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
796 {
797 rtnl_kfree_skbs(skb, skb);
798 qdisc_qstats_drop(sch);
799 }
800
801
802 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
803 struct sk_buff **to_free)
804 {
805 __qdisc_drop(skb, to_free);
806 qdisc_qstats_drop(sch);
807
808 return NET_XMIT_DROP;
809 }
810
811 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
812 long it will take to send a packet given its size.
813 */
814 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
815 {
816 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
817 if (slot < 0)
818 slot = 0;
819 slot >>= rtab->rate.cell_log;
820 if (slot > 255)
821 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
822 return rtab->data[slot];
823 }
824
825 struct psched_ratecfg {
826 u64 rate_bytes_ps; /* bytes per second */
827 u32 mult;
828 u16 overhead;
829 u8 linklayer;
830 u8 shift;
831 };
832
833 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
834 unsigned int len)
835 {
836 len += r->overhead;
837
838 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
839 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
840
841 return ((u64)len * r->mult) >> r->shift;
842 }
843
844 void psched_ratecfg_precompute(struct psched_ratecfg *r,
845 const struct tc_ratespec *conf,
846 u64 rate64);
847
848 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
849 const struct psched_ratecfg *r)
850 {
851 memset(res, 0, sizeof(*res));
852
853 /* legacy struct tc_ratespec has a 32bit @rate field
854 * Qdisc using 64bit rate should add new attributes
855 * in order to maintain compatibility.
856 */
857 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
858
859 res->overhead = r->overhead;
860 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
861 }
862
863 #endif
Linux with added FPC-III support