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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/module.h>
8#include <linux/pkt_sched.h>
9#include <linux/pkt_cls.h>
10#include <net/gen_stats.h>
11#include <net/rtnetlink.h>
12
13struct Qdisc_ops;
14struct qdisc_walker;
15struct tcf_walker;
16struct module;
17
18struct qdisc_rate_table {
19 struct tc_ratespec rate;
20 u32 data[256];
21 struct qdisc_rate_table *next;
22 int refcnt;
23};
24
25enum qdisc_state_t {
26 __QDISC_STATE_SCHED,
27 __QDISC_STATE_DEACTIVATED,
28 __QDISC_STATE_THROTTLED,
29};
30
31/*
32 * following bits are only changed while qdisc lock is held
33 */
34enum qdisc___state_t {
35 __QDISC___STATE_RUNNING = 1,
36};
37
38struct qdisc_size_table {
39 struct rcu_head rcu;
40 struct list_head list;
41 struct tc_sizespec szopts;
42 int refcnt;
43 u16 data[];
44};
45
46struct Qdisc {
47 int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
48 struct sk_buff * (*dequeue)(struct Qdisc *dev);
49 unsigned flags;
50#define TCQ_F_BUILTIN 1
51#define TCQ_F_INGRESS 2
52#define TCQ_F_CAN_BYPASS 4
53#define TCQ_F_MQROOT 8
54#define TCQ_F_WARN_NONWC (1 << 16)
55 int padded;
56 struct Qdisc_ops *ops;
57 struct qdisc_size_table __rcu *stab;
58 struct list_head list;
59 u32 handle;
60 u32 parent;
61 atomic_t refcnt;
62 struct gnet_stats_rate_est rate_est;
63 int (*reshape_fail)(struct sk_buff *skb,
64 struct Qdisc *q);
65
66 void *u32_node;
67
68 /* This field is deprecated, but it is still used by CBQ
69 * and it will live until better solution will be invented.
70 */
71 struct Qdisc *__parent;
72 struct netdev_queue *dev_queue;
73 struct Qdisc *next_sched;
74
75 struct sk_buff *gso_skb;
76 /*
77 * For performance sake on SMP, we put highly modified fields at the end
78 */
79 unsigned long state;
80 struct sk_buff_head q;
81 struct gnet_stats_basic_packed bstats;
82 unsigned int __state;
83 struct gnet_stats_queue qstats;
84 struct rcu_head rcu_head;
85 spinlock_t busylock;
86 u32 limit;
87};
88
89static inline bool qdisc_is_running(const struct Qdisc *qdisc)
90{
91 return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
92}
93
94static inline bool qdisc_run_begin(struct Qdisc *qdisc)
95{
96 if (qdisc_is_running(qdisc))
97 return false;
98 qdisc->__state |= __QDISC___STATE_RUNNING;
99 return true;
100}
101
102static inline void qdisc_run_end(struct Qdisc *qdisc)
103{
104 qdisc->__state &= ~__QDISC___STATE_RUNNING;
105}
106
107static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
108{
109 return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
110}
111
112static inline void qdisc_throttled(struct Qdisc *qdisc)
113{
114 set_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
115}
116
117static inline void qdisc_unthrottled(struct Qdisc *qdisc)
118{
119 clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
120}
121
122struct Qdisc_class_ops {
123 /* Child qdisc manipulation */
124 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
125 int (*graft)(struct Qdisc *, unsigned long cl,
126 struct Qdisc *, struct Qdisc **);
127 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
128 void (*qlen_notify)(struct Qdisc *, unsigned long);
129
130 /* Class manipulation routines */
131 unsigned long (*get)(struct Qdisc *, u32 classid);
132 void (*put)(struct Qdisc *, unsigned long);
133 int (*change)(struct Qdisc *, u32, u32,
134 struct nlattr **, unsigned long *);
135 int (*delete)(struct Qdisc *, unsigned long);
136 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
137
138 /* Filter manipulation */
139 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
140 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
141 u32 classid);
142 void (*unbind_tcf)(struct Qdisc *, unsigned long);
143
144 /* rtnetlink specific */
145 int (*dump)(struct Qdisc *, unsigned long,
146 struct sk_buff *skb, struct tcmsg*);
147 int (*dump_stats)(struct Qdisc *, unsigned long,
148 struct gnet_dump *);
149};
150
151struct Qdisc_ops {
152 struct Qdisc_ops *next;
153 const struct Qdisc_class_ops *cl_ops;
154 char id[IFNAMSIZ];
155 int priv_size;
156
157 int (*enqueue)(struct sk_buff *, struct Qdisc *);
158 struct sk_buff * (*dequeue)(struct Qdisc *);
159 struct sk_buff * (*peek)(struct Qdisc *);
160 unsigned int (*drop)(struct Qdisc *);
161
162 int (*init)(struct Qdisc *, struct nlattr *arg);
163 void (*reset)(struct Qdisc *);
164 void (*destroy)(struct Qdisc *);
165 int (*change)(struct Qdisc *, struct nlattr *arg);
166 void (*attach)(struct Qdisc *);
167
168 int (*dump)(struct Qdisc *, struct sk_buff *);
169 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
170
171 struct module *owner;
172};
173
174
175struct tcf_result {
176 unsigned long class;
177 u32 classid;
178};
179
180struct tcf_proto_ops {
181 struct tcf_proto_ops *next;
182 char kind[IFNAMSIZ];
183
184 int (*classify)(struct sk_buff *,
185 const struct tcf_proto *,
186 struct tcf_result *);
187 int (*init)(struct tcf_proto*);
188 void (*destroy)(struct tcf_proto*);
189
190 unsigned long (*get)(struct tcf_proto*, u32 handle);
191 void (*put)(struct tcf_proto*, unsigned long);
192 int (*change)(struct tcf_proto*, unsigned long,
193 u32 handle, struct nlattr **,
194 unsigned long *);
195 int (*delete)(struct tcf_proto*, unsigned long);
196 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
197
198 /* rtnetlink specific */
199 int (*dump)(struct tcf_proto*, unsigned long,
200 struct sk_buff *skb, struct tcmsg*);
201
202 struct module *owner;
203};
204
205struct tcf_proto {
206 /* Fast access part */
207 struct tcf_proto *next;
208 void *root;
209 int (*classify)(struct sk_buff *,
210 const struct tcf_proto *,
211 struct tcf_result *);
212 __be16 protocol;
213
214 /* All the rest */
215 u32 prio;
216 u32 classid;
217 struct Qdisc *q;
218 void *data;
219 const struct tcf_proto_ops *ops;
220};
221
222struct qdisc_skb_cb {
223 unsigned int pkt_len;
224 long data[];
225};
226
227static inline int qdisc_qlen(struct Qdisc *q)
228{
229 return q->q.qlen;
230}
231
232static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
233{
234 return (struct qdisc_skb_cb *)skb->cb;
235}
236
237static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
238{
239 return &qdisc->q.lock;
240}
241
242static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
243{
244 return qdisc->dev_queue->qdisc;
245}
246
247static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
248{
249 return qdisc->dev_queue->qdisc_sleeping;
250}
251
252/* The qdisc root lock is a mechanism by which to top level
253 * of a qdisc tree can be locked from any qdisc node in the
254 * forest. This allows changing the configuration of some
255 * aspect of the qdisc tree while blocking out asynchronous
256 * qdisc access in the packet processing paths.
257 *
258 * It is only legal to do this when the root will not change
259 * on us. Otherwise we'll potentially lock the wrong qdisc
260 * root. This is enforced by holding the RTNL semaphore, which
261 * all users of this lock accessor must do.
262 */
263static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
264{
265 struct Qdisc *root = qdisc_root(qdisc);
266
267 ASSERT_RTNL();
268 return qdisc_lock(root);
269}
270
271static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
272{
273 struct Qdisc *root = qdisc_root_sleeping(qdisc);
274
275 ASSERT_RTNL();
276 return qdisc_lock(root);
277}
278
279static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
280{
281 return qdisc->dev_queue->dev;
282}
283
284static inline void sch_tree_lock(struct Qdisc *q)
285{
286 spin_lock_bh(qdisc_root_sleeping_lock(q));
287}
288
289static inline void sch_tree_unlock(struct Qdisc *q)
290{
291 spin_unlock_bh(qdisc_root_sleeping_lock(q));
292}
293
294#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
295#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
296
297extern struct Qdisc noop_qdisc;
298extern struct Qdisc_ops noop_qdisc_ops;
299extern struct Qdisc_ops pfifo_fast_ops;
300extern struct Qdisc_ops mq_qdisc_ops;
301
302struct Qdisc_class_common {
303 u32 classid;
304 struct hlist_node hnode;
305};
306
307struct Qdisc_class_hash {
308 struct hlist_head *hash;
309 unsigned int hashsize;
310 unsigned int hashmask;
311 unsigned int hashelems;
312};
313
314static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
315{
316 id ^= id >> 8;
317 id ^= id >> 4;
318 return id & mask;
319}
320
321static inline struct Qdisc_class_common *
322qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
323{
324 struct Qdisc_class_common *cl;
325 struct hlist_node *n;
326 unsigned int h;
327
328 h = qdisc_class_hash(id, hash->hashmask);
329 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
330 if (cl->classid == id)
331 return cl;
332 }
333 return NULL;
334}
335
336extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
337extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
338extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
339extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
340extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
341
342extern void dev_init_scheduler(struct net_device *dev);
343extern void dev_shutdown(struct net_device *dev);
344extern void dev_activate(struct net_device *dev);
345extern void dev_deactivate(struct net_device *dev);
346extern void dev_deactivate_many(struct list_head *head);
347extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
348 struct Qdisc *qdisc);
349extern void qdisc_reset(struct Qdisc *qdisc);
350extern void qdisc_destroy(struct Qdisc *qdisc);
351extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
352extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
353 struct Qdisc_ops *ops);
354extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
355 struct Qdisc_ops *ops, u32 parentid);
356extern void __qdisc_calculate_pkt_len(struct sk_buff *skb,
357 const struct qdisc_size_table *stab);
358extern void tcf_destroy(struct tcf_proto *tp);
359extern void tcf_destroy_chain(struct tcf_proto **fl);
360
361/* Reset all TX qdiscs greater then index of a device. */
362static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
363{
364 struct Qdisc *qdisc;
365
366 for (; i < dev->num_tx_queues; i++) {
367 qdisc = netdev_get_tx_queue(dev, i)->qdisc;
368 if (qdisc) {
369 spin_lock_bh(qdisc_lock(qdisc));
370 qdisc_reset(qdisc);
371 spin_unlock_bh(qdisc_lock(qdisc));
372 }
373 }
374}
375
376static inline void qdisc_reset_all_tx(struct net_device *dev)
377{
378 qdisc_reset_all_tx_gt(dev, 0);
379}
380
381/* Are all TX queues of the device empty? */
382static inline bool qdisc_all_tx_empty(const struct net_device *dev)
383{
384 unsigned int i;
385 for (i = 0; i < dev->num_tx_queues; i++) {
386 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
387 const struct Qdisc *q = txq->qdisc;
388
389 if (q->q.qlen)
390 return false;
391 }
392 return true;
393}
394
395/* Are any of the TX qdiscs changing? */
396static inline bool qdisc_tx_changing(struct net_device *dev)
397{
398 unsigned int i;
399 for (i = 0; i < dev->num_tx_queues; i++) {
400 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
401 if (txq->qdisc != txq->qdisc_sleeping)
402 return true;
403 }
404 return false;
405}
406
407/* Is the device using the noop qdisc on all queues? */
408static inline bool qdisc_tx_is_noop(const struct net_device *dev)
409{
410 unsigned int i;
411 for (i = 0; i < dev->num_tx_queues; i++) {
412 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
413 if (txq->qdisc != &noop_qdisc)
414 return false;
415 }
416 return true;
417}
418
419static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
420{
421 return qdisc_skb_cb(skb)->pkt_len;
422}
423
424/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
425enum net_xmit_qdisc_t {
426 __NET_XMIT_STOLEN = 0x00010000,
427 __NET_XMIT_BYPASS = 0x00020000,
428};
429
430#ifdef CONFIG_NET_CLS_ACT
431#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
432#else
433#define net_xmit_drop_count(e) (1)
434#endif
435
436static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
437 const struct Qdisc *sch)
438{
439#ifdef CONFIG_NET_SCHED
440 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
441
442 if (stab)
443 __qdisc_calculate_pkt_len(skb, stab);
444#endif
445}
446
447static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
448{
449 qdisc_calculate_pkt_len(skb, sch);
450 return sch->enqueue(skb, sch);
451}
452
453static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
454{
455 qdisc_skb_cb(skb)->pkt_len = skb->len;
456 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
457}
458
459
460static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
461 const struct sk_buff *skb)
462{
463 bstats->bytes += qdisc_pkt_len(skb);
464 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
465}
466
467static inline void qdisc_bstats_update(struct Qdisc *sch,
468 const struct sk_buff *skb)
469{
470 bstats_update(&sch->bstats, skb);
471}
472
473static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
474 struct sk_buff_head *list)
475{
476 __skb_queue_tail(list, skb);
477 sch->qstats.backlog += qdisc_pkt_len(skb);
478
479 return NET_XMIT_SUCCESS;
480}
481
482static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
483{
484 return __qdisc_enqueue_tail(skb, sch, &sch->q);
485}
486
487static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
488 struct sk_buff_head *list)
489{
490 struct sk_buff *skb = __skb_dequeue(list);
491
492 if (likely(skb != NULL)) {
493 sch->qstats.backlog -= qdisc_pkt_len(skb);
494 qdisc_bstats_update(sch, skb);
495 }
496
497 return skb;
498}
499
500static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
501{
502 return __qdisc_dequeue_head(sch, &sch->q);
503}
504
505static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
506 struct sk_buff_head *list)
507{
508 struct sk_buff *skb = __skb_dequeue(list);
509
510 if (likely(skb != NULL)) {
511 unsigned int len = qdisc_pkt_len(skb);
512 sch->qstats.backlog -= len;
513 kfree_skb(skb);
514 return len;
515 }
516
517 return 0;
518}
519
520static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
521{
522 return __qdisc_queue_drop_head(sch, &sch->q);
523}
524
525static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
526 struct sk_buff_head *list)
527{
528 struct sk_buff *skb = __skb_dequeue_tail(list);
529
530 if (likely(skb != NULL))
531 sch->qstats.backlog -= qdisc_pkt_len(skb);
532
533 return skb;
534}
535
536static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
537{
538 return __qdisc_dequeue_tail(sch, &sch->q);
539}
540
541static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
542{
543 return skb_peek(&sch->q);
544}
545
546/* generic pseudo peek method for non-work-conserving qdisc */
547static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
548{
549 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
550 if (!sch->gso_skb) {
551 sch->gso_skb = sch->dequeue(sch);
552 if (sch->gso_skb)
553 /* it's still part of the queue */
554 sch->q.qlen++;
555 }
556
557 return sch->gso_skb;
558}
559
560/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
561static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
562{
563 struct sk_buff *skb = sch->gso_skb;
564
565 if (skb) {
566 sch->gso_skb = NULL;
567 sch->q.qlen--;
568 } else {
569 skb = sch->dequeue(sch);
570 }
571
572 return skb;
573}
574
575static inline void __qdisc_reset_queue(struct Qdisc *sch,
576 struct sk_buff_head *list)
577{
578 /*
579 * We do not know the backlog in bytes of this list, it
580 * is up to the caller to correct it
581 */
582 __skb_queue_purge(list);
583}
584
585static inline void qdisc_reset_queue(struct Qdisc *sch)
586{
587 __qdisc_reset_queue(sch, &sch->q);
588 sch->qstats.backlog = 0;
589}
590
591static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
592 struct sk_buff_head *list)
593{
594 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
595
596 if (likely(skb != NULL)) {
597 unsigned int len = qdisc_pkt_len(skb);
598 kfree_skb(skb);
599 return len;
600 }
601
602 return 0;
603}
604
605static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
606{
607 return __qdisc_queue_drop(sch, &sch->q);
608}
609
610static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
611{
612 kfree_skb(skb);
613 sch->qstats.drops++;
614
615 return NET_XMIT_DROP;
616}
617
618static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
619{
620 sch->qstats.drops++;
621
622#ifdef CONFIG_NET_CLS_ACT
623 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
624 goto drop;
625
626 return NET_XMIT_SUCCESS;
627
628drop:
629#endif
630 kfree_skb(skb);
631 return NET_XMIT_DROP;
632}
633
634/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
635 long it will take to send a packet given its size.
636 */
637static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
638{
639 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
640 if (slot < 0)
641 slot = 0;
642 slot >>= rtab->rate.cell_log;
643 if (slot > 255)
644 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
645 return rtab->data[slot];
646}
647
648#ifdef CONFIG_NET_CLS_ACT
649static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
650 int action)
651{
652 struct sk_buff *n;
653
654 n = skb_clone(skb, gfp_mask);
655
656 if (n) {
657 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
658 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
659 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
660 }
661 return n;
662}
663#endif
664
665#endif
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
14struct Qdisc_ops;
15struct qdisc_walker;
16struct tcf_walker;
17struct module;
18
19struct qdisc_rate_table {
20 struct tc_ratespec rate;
21 u32 data[256];
22 struct qdisc_rate_table *next;
23 int refcnt;
24};
25
26enum qdisc_state_t {
27 __QDISC_STATE_SCHED,
28 __QDISC_STATE_DEACTIVATED,
29};
30
31struct 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. */
40struct qdisc_skb_head {
41 struct sk_buff *head;
42 struct sk_buff *tail;
43 __u32 qlen;
44 spinlock_t lock;
45};
46
47struct 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
101static inline bool qdisc_is_running(const struct Qdisc *qdisc)
102{
103 return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
104}
105
106static 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
118static inline void qdisc_run_end(struct Qdisc *qdisc)
119{
120 write_seqcount_end(&qdisc->running);
121}
122
123static inline bool qdisc_may_bulk(const struct Qdisc *qdisc)
124{
125 return qdisc->flags & TCQ_F_ONETXQUEUE;
126}
127
128static 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
138struct 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
168struct 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
193struct tcf_result {
194 unsigned long class;
195 u32 classid;
196};
197
198struct 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
223struct 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
241struct 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
249static 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
257static inline int qdisc_qlen(const struct Qdisc *q)
258{
259 return q->q.qlen;
260}
261
262static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
263{
264 return (struct qdisc_skb_cb *)skb->cb;
265}
266
267static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
268{
269 return &qdisc->q.lock;
270}
271
272static 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
279static 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 */
295static 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
303static 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
311static 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
319static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
320{
321 return qdisc->dev_queue->dev;
322}
323
324static inline void sch_tree_lock(const struct Qdisc *q)
325{
326 spin_lock_bh(qdisc_root_sleeping_lock(q));
327}
328
329static 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
337extern struct Qdisc noop_qdisc;
338extern struct Qdisc_ops noop_qdisc_ops;
339extern struct Qdisc_ops pfifo_fast_ops;
340extern struct Qdisc_ops mq_qdisc_ops;
341extern struct Qdisc_ops noqueue_qdisc_ops;
342extern const struct Qdisc_ops *default_qdisc_ops;
343static inline const struct Qdisc_ops *
344get_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
350struct Qdisc_class_common {
351 u32 classid;
352 struct hlist_node hnode;
353};
354
355struct Qdisc_class_hash {
356 struct hlist_head *hash;
357 unsigned int hashsize;
358 unsigned int hashmask;
359 unsigned int hashelems;
360};
361
362static 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
369static inline struct Qdisc_class_common *
370qdisc_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
383int qdisc_class_hash_init(struct Qdisc_class_hash *);
384void qdisc_class_hash_insert(struct Qdisc_class_hash *,
385 struct Qdisc_class_common *);
386void qdisc_class_hash_remove(struct Qdisc_class_hash *,
387 struct Qdisc_class_common *);
388void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
389void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
390
391void dev_init_scheduler(struct net_device *dev);
392void dev_shutdown(struct net_device *dev);
393void dev_activate(struct net_device *dev);
394void dev_deactivate(struct net_device *dev);
395void dev_deactivate_many(struct list_head *head);
396struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
397 struct Qdisc *qdisc);
398void qdisc_reset(struct Qdisc *qdisc);
399void qdisc_destroy(struct Qdisc *qdisc);
400void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
401 unsigned int len);
402struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
403 const struct Qdisc_ops *ops);
404struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
405 const struct Qdisc_ops *ops, u32 parentid);
406void __qdisc_calculate_pkt_len(struct sk_buff *skb,
407 const struct qdisc_size_table *stab);
408bool tcf_destroy(struct tcf_proto *tp, bool force);
409void tcf_destroy_chain(struct tcf_proto __rcu **fl);
410int skb_do_redirect(struct sk_buff *);
411
412static inline bool skb_at_tc_ingress(const struct sk_buff *skb)
413{
414#ifdef CONFIG_NET_CLS_ACT
415 return G_TC_AT(skb->tc_verd) & AT_INGRESS;
416#else
417 return false;
418#endif
419}
420
421/* Reset all TX qdiscs greater then index of a device. */
422static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
423{
424 struct Qdisc *qdisc;
425
426 for (; i < dev->num_tx_queues; i++) {
427 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
428 if (qdisc) {
429 spin_lock_bh(qdisc_lock(qdisc));
430 qdisc_reset(qdisc);
431 spin_unlock_bh(qdisc_lock(qdisc));
432 }
433 }
434}
435
436static inline void qdisc_reset_all_tx(struct net_device *dev)
437{
438 qdisc_reset_all_tx_gt(dev, 0);
439}
440
441/* Are all TX queues of the device empty? */
442static inline bool qdisc_all_tx_empty(const struct net_device *dev)
443{
444 unsigned int i;
445
446 rcu_read_lock();
447 for (i = 0; i < dev->num_tx_queues; i++) {
448 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
449 const struct Qdisc *q = rcu_dereference(txq->qdisc);
450
451 if (q->q.qlen) {
452 rcu_read_unlock();
453 return false;
454 }
455 }
456 rcu_read_unlock();
457 return true;
458}
459
460/* Are any of the TX qdiscs changing? */
461static inline bool qdisc_tx_changing(const struct net_device *dev)
462{
463 unsigned int i;
464
465 for (i = 0; i < dev->num_tx_queues; i++) {
466 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
467 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
468 return true;
469 }
470 return false;
471}
472
473/* Is the device using the noop qdisc on all queues? */
474static inline bool qdisc_tx_is_noop(const struct net_device *dev)
475{
476 unsigned int i;
477
478 for (i = 0; i < dev->num_tx_queues; i++) {
479 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
480 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
481 return false;
482 }
483 return true;
484}
485
486static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
487{
488 return qdisc_skb_cb(skb)->pkt_len;
489}
490
491/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
492enum net_xmit_qdisc_t {
493 __NET_XMIT_STOLEN = 0x00010000,
494 __NET_XMIT_BYPASS = 0x00020000,
495};
496
497#ifdef CONFIG_NET_CLS_ACT
498#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
499#else
500#define net_xmit_drop_count(e) (1)
501#endif
502
503static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
504 const struct Qdisc *sch)
505{
506#ifdef CONFIG_NET_SCHED
507 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
508
509 if (stab)
510 __qdisc_calculate_pkt_len(skb, stab);
511#endif
512}
513
514static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
515 struct sk_buff **to_free)
516{
517 qdisc_calculate_pkt_len(skb, sch);
518 return sch->enqueue(skb, sch, to_free);
519}
520
521static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
522{
523 return q->flags & TCQ_F_CPUSTATS;
524}
525
526static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
527 __u64 bytes, __u32 packets)
528{
529 bstats->bytes += bytes;
530 bstats->packets += packets;
531}
532
533static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
534 const struct sk_buff *skb)
535{
536 _bstats_update(bstats,
537 qdisc_pkt_len(skb),
538 skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
539}
540
541static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
542 __u64 bytes, __u32 packets)
543{
544 u64_stats_update_begin(&bstats->syncp);
545 _bstats_update(&bstats->bstats, bytes, packets);
546 u64_stats_update_end(&bstats->syncp);
547}
548
549static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
550 const struct sk_buff *skb)
551{
552 u64_stats_update_begin(&bstats->syncp);
553 bstats_update(&bstats->bstats, skb);
554 u64_stats_update_end(&bstats->syncp);
555}
556
557static inline void qdisc_bstats_cpu_update(struct Qdisc *sch,
558 const struct sk_buff *skb)
559{
560 bstats_cpu_update(this_cpu_ptr(sch->cpu_bstats), skb);
561}
562
563static inline void qdisc_bstats_update(struct Qdisc *sch,
564 const struct sk_buff *skb)
565{
566 bstats_update(&sch->bstats, skb);
567}
568
569static inline void qdisc_qstats_backlog_dec(struct Qdisc *sch,
570 const struct sk_buff *skb)
571{
572 sch->qstats.backlog -= qdisc_pkt_len(skb);
573}
574
575static inline void qdisc_qstats_backlog_inc(struct Qdisc *sch,
576 const struct sk_buff *skb)
577{
578 sch->qstats.backlog += qdisc_pkt_len(skb);
579}
580
581static inline void __qdisc_qstats_drop(struct Qdisc *sch, int count)
582{
583 sch->qstats.drops += count;
584}
585
586static inline void qstats_drop_inc(struct gnet_stats_queue *qstats)
587{
588 qstats->drops++;
589}
590
591static inline void qstats_overlimit_inc(struct gnet_stats_queue *qstats)
592{
593 qstats->overlimits++;
594}
595
596static inline void qdisc_qstats_drop(struct Qdisc *sch)
597{
598 qstats_drop_inc(&sch->qstats);
599}
600
601static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
602{
603 this_cpu_inc(sch->cpu_qstats->drops);
604}
605
606static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
607{
608 sch->qstats.overlimits++;
609}
610
611static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
612{
613 qh->head = NULL;
614 qh->tail = NULL;
615 qh->qlen = 0;
616}
617
618static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
619 struct qdisc_skb_head *qh)
620{
621 struct sk_buff *last = qh->tail;
622
623 if (last) {
624 skb->next = NULL;
625 last->next = skb;
626 qh->tail = skb;
627 } else {
628 qh->tail = skb;
629 qh->head = skb;
630 }
631 qh->qlen++;
632 qdisc_qstats_backlog_inc(sch, skb);
633
634 return NET_XMIT_SUCCESS;
635}
636
637static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
638{
639 return __qdisc_enqueue_tail(skb, sch, &sch->q);
640}
641
642static inline struct sk_buff *__qdisc_dequeue_head(struct qdisc_skb_head *qh)
643{
644 struct sk_buff *skb = qh->head;
645
646 if (likely(skb != NULL)) {
647 qh->head = skb->next;
648 qh->qlen--;
649 if (qh->head == NULL)
650 qh->tail = NULL;
651 skb->next = NULL;
652 }
653
654 return skb;
655}
656
657static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
658{
659 struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
660
661 if (likely(skb != NULL)) {
662 qdisc_qstats_backlog_dec(sch, skb);
663 qdisc_bstats_update(sch, skb);
664 }
665
666 return skb;
667}
668
669/* Instead of calling kfree_skb() while root qdisc lock is held,
670 * queue the skb for future freeing at end of __dev_xmit_skb()
671 */
672static inline void __qdisc_drop(struct sk_buff *skb, struct sk_buff **to_free)
673{
674 skb->next = *to_free;
675 *to_free = skb;
676}
677
678static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
679 struct qdisc_skb_head *qh,
680 struct sk_buff **to_free)
681{
682 struct sk_buff *skb = __qdisc_dequeue_head(qh);
683
684 if (likely(skb != NULL)) {
685 unsigned int len = qdisc_pkt_len(skb);
686
687 qdisc_qstats_backlog_dec(sch, skb);
688 __qdisc_drop(skb, to_free);
689 return len;
690 }
691
692 return 0;
693}
694
695static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch,
696 struct sk_buff **to_free)
697{
698 return __qdisc_queue_drop_head(sch, &sch->q, to_free);
699}
700
701static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
702{
703 const struct qdisc_skb_head *qh = &sch->q;
704
705 return qh->head;
706}
707
708/* generic pseudo peek method for non-work-conserving qdisc */
709static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
710{
711 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
712 if (!sch->gso_skb) {
713 sch->gso_skb = sch->dequeue(sch);
714 if (sch->gso_skb) {
715 /* it's still part of the queue */
716 qdisc_qstats_backlog_inc(sch, sch->gso_skb);
717 sch->q.qlen++;
718 }
719 }
720
721 return sch->gso_skb;
722}
723
724/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
725static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
726{
727 struct sk_buff *skb = sch->gso_skb;
728
729 if (skb) {
730 sch->gso_skb = NULL;
731 qdisc_qstats_backlog_dec(sch, skb);
732 sch->q.qlen--;
733 } else {
734 skb = sch->dequeue(sch);
735 }
736
737 return skb;
738}
739
740static inline void __qdisc_reset_queue(struct qdisc_skb_head *qh)
741{
742 /*
743 * We do not know the backlog in bytes of this list, it
744 * is up to the caller to correct it
745 */
746 ASSERT_RTNL();
747 if (qh->qlen) {
748 rtnl_kfree_skbs(qh->head, qh->tail);
749
750 qh->head = NULL;
751 qh->tail = NULL;
752 qh->qlen = 0;
753 }
754}
755
756static inline void qdisc_reset_queue(struct Qdisc *sch)
757{
758 __qdisc_reset_queue(&sch->q);
759 sch->qstats.backlog = 0;
760}
761
762static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
763 struct Qdisc **pold)
764{
765 struct Qdisc *old;
766
767 sch_tree_lock(sch);
768 old = *pold;
769 *pold = new;
770 if (old != NULL) {
771 qdisc_tree_reduce_backlog(old, old->q.qlen, old->qstats.backlog);
772 qdisc_reset(old);
773 }
774 sch_tree_unlock(sch);
775
776 return old;
777}
778
779static inline void rtnl_qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
780{
781 rtnl_kfree_skbs(skb, skb);
782 qdisc_qstats_drop(sch);
783}
784
785
786static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch,
787 struct sk_buff **to_free)
788{
789 __qdisc_drop(skb, to_free);
790 qdisc_qstats_drop(sch);
791
792 return NET_XMIT_DROP;
793}
794
795/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
796 long it will take to send a packet given its size.
797 */
798static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
799{
800 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
801 if (slot < 0)
802 slot = 0;
803 slot >>= rtab->rate.cell_log;
804 if (slot > 255)
805 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
806 return rtab->data[slot];
807}
808
809struct psched_ratecfg {
810 u64 rate_bytes_ps; /* bytes per second */
811 u32 mult;
812 u16 overhead;
813 u8 linklayer;
814 u8 shift;
815};
816
817static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
818 unsigned int len)
819{
820 len += r->overhead;
821
822 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
823 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
824
825 return ((u64)len * r->mult) >> r->shift;
826}
827
828void psched_ratecfg_precompute(struct psched_ratecfg *r,
829 const struct tc_ratespec *conf,
830 u64 rate64);
831
832static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
833 const struct psched_ratecfg *r)
834{
835 memset(res, 0, sizeof(*res));
836
837 /* legacy struct tc_ratespec has a 32bit @rate field
838 * Qdisc using 64bit rate should add new attributes
839 * in order to maintain compatibility.
840 */
841 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
842
843 res->overhead = r->overhead;
844 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
845}
846
847#endif