1 #ifndef __NET_SCHED_GENERIC_H
2 #define __NET_SCHED_GENERIC_H
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>
17 struct qdisc_rate_table {
18 struct tc_ratespec rate;
20 struct qdisc_rate_table *next;
26 __QDISC_STATE_DEACTIVATED,
27 __QDISC_STATE_THROTTLED,
31 * following bits are only changed while qdisc lock is held
33 enum qdisc___state_t {
34 __QDISC___STATE_RUNNING = 1,
37 struct qdisc_size_table {
39 struct list_head list;
40 struct tc_sizespec szopts;
46 int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
47 struct sk_buff * (*dequeue)(struct Qdisc *dev);
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_ONETXQUEUE 0x10 /* dequeue_skb() can assume all skbs are for
54 * q->dev_queue : It can test
55 * netif_xmit_frozen_or_stopped() before
56 * dequeueing next packet.
57 * Its true for MQ/MQPRIO slaves, or non
60 #define TCQ_F_WARN_NONWC (1 << 16)
62 const struct Qdisc_ops *ops;
63 struct qdisc_size_table __rcu *stab;
64 struct list_head list;
67 int (*reshape_fail)(struct sk_buff *skb,
72 /* This field is deprecated, but it is still used by CBQ
73 * and it will live until better solution will be invented.
75 struct Qdisc *__parent;
76 struct netdev_queue *dev_queue;
78 struct gnet_stats_rate_est64 rate_est;
79 struct Qdisc *next_sched;
80 struct sk_buff *gso_skb;
82 * For performance sake on SMP, we put highly modified fields at the end
85 struct sk_buff_head q;
86 struct gnet_stats_basic_packed bstats;
88 struct gnet_stats_queue qstats;
89 struct rcu_head rcu_head;
93 spinlock_t busylock ____cacheline_aligned_in_smp;
96 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
98 return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
101 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
103 if (qdisc_is_running(qdisc))
105 qdisc->__state |= __QDISC___STATE_RUNNING;
109 static inline void qdisc_run_end(struct Qdisc *qdisc)
111 qdisc->__state &= ~__QDISC___STATE_RUNNING;
114 static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
116 return test_bit(__QDISC_STATE_THROTTLED, &qdisc->state) ? true : false;
119 static inline void qdisc_throttled(struct Qdisc *qdisc)
121 set_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
124 static inline void qdisc_unthrottled(struct Qdisc *qdisc)
126 clear_bit(__QDISC_STATE_THROTTLED, &qdisc->state);
129 struct Qdisc_class_ops {
130 /* Child qdisc manipulation */
131 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
132 int (*graft)(struct Qdisc *, unsigned long cl,
133 struct Qdisc *, struct Qdisc **);
134 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
135 void (*qlen_notify)(struct Qdisc *, unsigned long);
137 /* Class manipulation routines */
138 unsigned long (*get)(struct Qdisc *, u32 classid);
139 void (*put)(struct Qdisc *, unsigned long);
140 int (*change)(struct Qdisc *, u32, u32,
141 struct nlattr **, unsigned long *);
142 int (*delete)(struct Qdisc *, unsigned long);
143 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
145 /* Filter manipulation */
146 struct tcf_proto __rcu ** (*tcf_chain)(struct Qdisc *, unsigned long);
147 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
149 void (*unbind_tcf)(struct Qdisc *, unsigned long);
151 /* rtnetlink specific */
152 int (*dump)(struct Qdisc *, unsigned long,
153 struct sk_buff *skb, struct tcmsg*);
154 int (*dump_stats)(struct Qdisc *, unsigned long,
159 struct Qdisc_ops *next;
160 const struct Qdisc_class_ops *cl_ops;
164 int (*enqueue)(struct sk_buff *, struct Qdisc *);
165 struct sk_buff * (*dequeue)(struct Qdisc *);
166 struct sk_buff * (*peek)(struct Qdisc *);
167 unsigned int (*drop)(struct Qdisc *);
169 int (*init)(struct Qdisc *, struct nlattr *arg);
170 void (*reset)(struct Qdisc *);
171 void (*destroy)(struct Qdisc *);
172 int (*change)(struct Qdisc *, struct nlattr *arg);
173 void (*attach)(struct Qdisc *);
175 int (*dump)(struct Qdisc *, struct sk_buff *);
176 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
178 struct module *owner;
187 struct tcf_proto_ops {
188 struct list_head head;
191 int (*classify)(struct sk_buff *,
192 const struct tcf_proto *,
193 struct tcf_result *);
194 int (*init)(struct tcf_proto*);
195 void (*destroy)(struct tcf_proto*);
197 unsigned long (*get)(struct tcf_proto*, u32 handle);
198 void (*put)(struct tcf_proto*, unsigned long);
199 int (*change)(struct net *net, struct sk_buff *,
200 struct tcf_proto*, unsigned long,
201 u32 handle, struct nlattr **,
202 unsigned long *, bool);
203 int (*delete)(struct tcf_proto*, unsigned long);
204 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
206 /* rtnetlink specific */
207 int (*dump)(struct net*, struct tcf_proto*, unsigned long,
208 struct sk_buff *skb, struct tcmsg*);
210 struct module *owner;
214 /* Fast access part */
215 struct tcf_proto __rcu *next;
217 int (*classify)(struct sk_buff *,
218 const struct tcf_proto *,
219 struct tcf_result *);
227 const struct tcf_proto_ops *ops;
231 struct qdisc_skb_cb {
232 unsigned int pkt_len;
233 u16 slave_dev_queue_mapping;
235 unsigned char data[24];
238 static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
240 struct qdisc_skb_cb *qcb;
242 BUILD_BUG_ON(sizeof(skb->cb) < offsetof(struct qdisc_skb_cb, data) + sz);
243 BUILD_BUG_ON(sizeof(qcb->data) < sz);
246 static inline int qdisc_qlen(const struct Qdisc *q)
251 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
253 return (struct qdisc_skb_cb *)skb->cb;
256 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
258 return &qdisc->q.lock;
261 static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
263 struct Qdisc *q = rcu_dereference_rtnl(qdisc->dev_queue->qdisc);
268 static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
270 return qdisc->dev_queue->qdisc_sleeping;
273 /* The qdisc root lock is a mechanism by which to top level
274 * of a qdisc tree can be locked from any qdisc node in the
275 * forest. This allows changing the configuration of some
276 * aspect of the qdisc tree while blocking out asynchronous
277 * qdisc access in the packet processing paths.
279 * It is only legal to do this when the root will not change
280 * on us. Otherwise we'll potentially lock the wrong qdisc
281 * root. This is enforced by holding the RTNL semaphore, which
282 * all users of this lock accessor must do.
284 static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
286 struct Qdisc *root = qdisc_root(qdisc);
289 return qdisc_lock(root);
292 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
294 struct Qdisc *root = qdisc_root_sleeping(qdisc);
297 return qdisc_lock(root);
300 static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
302 return qdisc->dev_queue->dev;
305 static inline void sch_tree_lock(const struct Qdisc *q)
307 spin_lock_bh(qdisc_root_sleeping_lock(q));
310 static inline void sch_tree_unlock(const struct Qdisc *q)
312 spin_unlock_bh(qdisc_root_sleeping_lock(q));
315 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
316 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
318 extern struct Qdisc noop_qdisc;
319 extern struct Qdisc_ops noop_qdisc_ops;
320 extern struct Qdisc_ops pfifo_fast_ops;
321 extern struct Qdisc_ops mq_qdisc_ops;
322 extern const struct Qdisc_ops *default_qdisc_ops;
324 struct Qdisc_class_common {
326 struct hlist_node hnode;
329 struct Qdisc_class_hash {
330 struct hlist_head *hash;
331 unsigned int hashsize;
332 unsigned int hashmask;
333 unsigned int hashelems;
336 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
343 static inline struct Qdisc_class_common *
344 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
346 struct Qdisc_class_common *cl;
349 h = qdisc_class_hash(id, hash->hashmask);
350 hlist_for_each_entry(cl, &hash->hash[h], hnode) {
351 if (cl->classid == id)
357 int qdisc_class_hash_init(struct Qdisc_class_hash *);
358 void qdisc_class_hash_insert(struct Qdisc_class_hash *,
359 struct Qdisc_class_common *);
360 void qdisc_class_hash_remove(struct Qdisc_class_hash *,
361 struct Qdisc_class_common *);
362 void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
363 void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
365 void dev_init_scheduler(struct net_device *dev);
366 void dev_shutdown(struct net_device *dev);
367 void dev_activate(struct net_device *dev);
368 void dev_deactivate(struct net_device *dev);
369 void dev_deactivate_many(struct list_head *head);
370 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
371 struct Qdisc *qdisc);
372 void qdisc_reset(struct Qdisc *qdisc);
373 void qdisc_destroy(struct Qdisc *qdisc);
374 void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
375 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
376 const struct Qdisc_ops *ops);
377 struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
378 const struct Qdisc_ops *ops, u32 parentid);
379 void __qdisc_calculate_pkt_len(struct sk_buff *skb,
380 const struct qdisc_size_table *stab);
381 void tcf_destroy(struct tcf_proto *tp);
382 void tcf_destroy_chain(struct tcf_proto __rcu **fl);
384 /* Reset all TX qdiscs greater then index of a device. */
385 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
389 for (; i < dev->num_tx_queues; i++) {
390 qdisc = rtnl_dereference(netdev_get_tx_queue(dev, i)->qdisc);
392 spin_lock_bh(qdisc_lock(qdisc));
394 spin_unlock_bh(qdisc_lock(qdisc));
399 static inline void qdisc_reset_all_tx(struct net_device *dev)
401 qdisc_reset_all_tx_gt(dev, 0);
404 /* Are all TX queues of the device empty? */
405 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
410 for (i = 0; i < dev->num_tx_queues; i++) {
411 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
412 const struct Qdisc *q = rcu_dereference(txq->qdisc);
423 /* Are any of the TX qdiscs changing? */
424 static inline bool qdisc_tx_changing(const struct net_device *dev)
428 for (i = 0; i < dev->num_tx_queues; i++) {
429 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
430 if (rcu_access_pointer(txq->qdisc) != txq->qdisc_sleeping)
436 /* Is the device using the noop qdisc on all queues? */
437 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
441 for (i = 0; i < dev->num_tx_queues; i++) {
442 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
443 if (rcu_access_pointer(txq->qdisc) != &noop_qdisc)
449 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
451 return qdisc_skb_cb(skb)->pkt_len;
454 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
455 enum net_xmit_qdisc_t {
456 __NET_XMIT_STOLEN = 0x00010000,
457 __NET_XMIT_BYPASS = 0x00020000,
460 #ifdef CONFIG_NET_CLS_ACT
461 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
463 #define net_xmit_drop_count(e) (1)
466 static inline void qdisc_calculate_pkt_len(struct sk_buff *skb,
467 const struct Qdisc *sch)
469 #ifdef CONFIG_NET_SCHED
470 struct qdisc_size_table *stab = rcu_dereference_bh(sch->stab);
473 __qdisc_calculate_pkt_len(skb, stab);
477 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
479 qdisc_calculate_pkt_len(skb, sch);
480 return sch->enqueue(skb, sch);
483 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
485 qdisc_skb_cb(skb)->pkt_len = skb->len;
486 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
490 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
491 const struct sk_buff *skb)
493 bstats->bytes += qdisc_pkt_len(skb);
494 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
497 static inline void qdisc_bstats_update(struct Qdisc *sch,
498 const struct sk_buff *skb)
500 bstats_update(&sch->bstats, skb);
503 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
504 struct sk_buff_head *list)
506 __skb_queue_tail(list, skb);
507 sch->qstats.backlog += qdisc_pkt_len(skb);
509 return NET_XMIT_SUCCESS;
512 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
514 return __qdisc_enqueue_tail(skb, sch, &sch->q);
517 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
518 struct sk_buff_head *list)
520 struct sk_buff *skb = __skb_dequeue(list);
522 if (likely(skb != NULL)) {
523 sch->qstats.backlog -= qdisc_pkt_len(skb);
524 qdisc_bstats_update(sch, skb);
530 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
532 return __qdisc_dequeue_head(sch, &sch->q);
535 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
536 struct sk_buff_head *list)
538 struct sk_buff *skb = __skb_dequeue(list);
540 if (likely(skb != NULL)) {
541 unsigned int len = qdisc_pkt_len(skb);
542 sch->qstats.backlog -= len;
550 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
552 return __qdisc_queue_drop_head(sch, &sch->q);
555 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
556 struct sk_buff_head *list)
558 struct sk_buff *skb = __skb_dequeue_tail(list);
560 if (likely(skb != NULL))
561 sch->qstats.backlog -= qdisc_pkt_len(skb);
566 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
568 return __qdisc_dequeue_tail(sch, &sch->q);
571 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
573 return skb_peek(&sch->q);
576 /* generic pseudo peek method for non-work-conserving qdisc */
577 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
579 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
581 sch->gso_skb = sch->dequeue(sch);
583 /* it's still part of the queue */
590 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
591 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
593 struct sk_buff *skb = sch->gso_skb;
599 skb = sch->dequeue(sch);
605 static inline void __qdisc_reset_queue(struct Qdisc *sch,
606 struct sk_buff_head *list)
609 * We do not know the backlog in bytes of this list, it
610 * is up to the caller to correct it
612 __skb_queue_purge(list);
615 static inline void qdisc_reset_queue(struct Qdisc *sch)
617 __qdisc_reset_queue(sch, &sch->q);
618 sch->qstats.backlog = 0;
621 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
622 struct sk_buff_head *list)
624 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
626 if (likely(skb != NULL)) {
627 unsigned int len = qdisc_pkt_len(skb);
635 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
637 return __qdisc_queue_drop(sch, &sch->q);
640 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
645 return NET_XMIT_DROP;
648 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
652 #ifdef CONFIG_NET_CLS_ACT
653 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
656 return NET_XMIT_SUCCESS;
661 return NET_XMIT_DROP;
664 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
665 long it will take to send a packet given its size.
667 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
669 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
672 slot >>= rtab->rate.cell_log;
674 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
675 return rtab->data[slot];
678 #ifdef CONFIG_NET_CLS_ACT
679 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
684 n = skb_clone(skb, gfp_mask);
687 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
688 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
689 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
695 struct psched_ratecfg {
696 u64 rate_bytes_ps; /* bytes per second */
703 static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
708 if (unlikely(r->linklayer == TC_LINKLAYER_ATM))
709 return ((u64)(DIV_ROUND_UP(len,48)*53) * r->mult) >> r->shift;
711 return ((u64)len * r->mult) >> r->shift;
714 void psched_ratecfg_precompute(struct psched_ratecfg *r,
715 const struct tc_ratespec *conf,
718 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
719 const struct psched_ratecfg *r)
721 memset(res, 0, sizeof(*res));
723 /* legacy struct tc_ratespec has a 32bit @rate field
724 * Qdisc using 64bit rate should add new attributes
725 * in order to maintain compatibility.
727 res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
729 res->overhead = r->overhead;
730 res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);