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