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/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>
18 struct qdisc_rate_table {
19 struct tc_ratespec rate;
21 struct qdisc_rate_table *next;
27 __QDISC_STATE_DEACTIVATED,
31 * following bits are only changed while qdisc lock is held
33 enum qdisc___state_t {
34 __QDISC___STATE_RUNNING = 1,
35 __QDISC___STATE_THROTTLED = 2,
38 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_WARN_NONWC (1 << 16)
55 struct Qdisc_ops *ops;
56 struct qdisc_size_table *stab;
57 struct list_head list;
61 struct gnet_stats_rate_est rate_est;
62 int (*reshape_fail)(struct sk_buff *skb,
67 /* This field is deprecated, but it is still used by CBQ
68 * and it will live until better solution will be invented.
70 struct Qdisc *__parent;
71 struct netdev_queue *dev_queue;
72 struct Qdisc *next_sched;
74 struct sk_buff *gso_skb;
76 * For performance sake on SMP, we put highly modified fields at the end
79 struct sk_buff_head q;
80 struct gnet_stats_basic_packed bstats;
82 struct gnet_stats_queue qstats;
83 struct rcu_head rcu_head;
87 static inline bool qdisc_is_running(const struct Qdisc *qdisc)
89 return (qdisc->__state & __QDISC___STATE_RUNNING) ? true : false;
92 static inline bool qdisc_run_begin(struct Qdisc *qdisc)
94 if (qdisc_is_running(qdisc))
96 qdisc->__state |= __QDISC___STATE_RUNNING;
100 static inline void qdisc_run_end(struct Qdisc *qdisc)
102 qdisc->__state &= ~__QDISC___STATE_RUNNING;
105 static inline bool qdisc_is_throttled(const struct Qdisc *qdisc)
107 return (qdisc->__state & __QDISC___STATE_THROTTLED) ? true : false;
110 static inline void qdisc_throttled(struct Qdisc *qdisc)
112 qdisc->__state |= __QDISC___STATE_THROTTLED;
115 static inline void qdisc_unthrottled(struct Qdisc *qdisc)
117 qdisc->__state &= ~__QDISC___STATE_THROTTLED;
120 struct Qdisc_class_ops {
121 /* Child qdisc manipulation */
122 struct netdev_queue * (*select_queue)(struct Qdisc *, struct tcmsg *);
123 int (*graft)(struct Qdisc *, unsigned long cl,
124 struct Qdisc *, struct Qdisc **);
125 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
126 void (*qlen_notify)(struct Qdisc *, unsigned long);
128 /* Class manipulation routines */
129 unsigned long (*get)(struct Qdisc *, u32 classid);
130 void (*put)(struct Qdisc *, unsigned long);
131 int (*change)(struct Qdisc *, u32, u32,
132 struct nlattr **, unsigned long *);
133 int (*delete)(struct Qdisc *, unsigned long);
134 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
136 /* Filter manipulation */
137 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
138 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
140 void (*unbind_tcf)(struct Qdisc *, unsigned long);
142 /* rtnetlink specific */
143 int (*dump)(struct Qdisc *, unsigned long,
144 struct sk_buff *skb, struct tcmsg*);
145 int (*dump_stats)(struct Qdisc *, unsigned long,
150 struct Qdisc_ops *next;
151 const struct Qdisc_class_ops *cl_ops;
155 int (*enqueue)(struct sk_buff *, struct Qdisc *);
156 struct sk_buff * (*dequeue)(struct Qdisc *);
157 struct sk_buff * (*peek)(struct Qdisc *);
158 unsigned int (*drop)(struct Qdisc *);
160 int (*init)(struct Qdisc *, struct nlattr *arg);
161 void (*reset)(struct Qdisc *);
162 void (*destroy)(struct Qdisc *);
163 int (*change)(struct Qdisc *, struct nlattr *arg);
164 void (*attach)(struct Qdisc *);
166 int (*dump)(struct Qdisc *, struct sk_buff *);
167 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
169 struct module *owner;
178 struct tcf_proto_ops {
179 struct tcf_proto_ops *next;
182 int (*classify)(struct sk_buff*, struct tcf_proto*,
183 struct tcf_result *);
184 int (*init)(struct tcf_proto*);
185 void (*destroy)(struct tcf_proto*);
187 unsigned long (*get)(struct tcf_proto*, u32 handle);
188 void (*put)(struct tcf_proto*, unsigned long);
189 int (*change)(struct tcf_proto*, unsigned long,
190 u32 handle, struct nlattr **,
192 int (*delete)(struct tcf_proto*, unsigned long);
193 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
195 /* rtnetlink specific */
196 int (*dump)(struct tcf_proto*, unsigned long,
197 struct sk_buff *skb, struct tcmsg*);
199 struct module *owner;
203 /* Fast access part */
204 struct tcf_proto *next;
206 int (*classify)(struct sk_buff*, struct tcf_proto*,
207 struct tcf_result *);
215 struct tcf_proto_ops *ops;
218 struct qdisc_skb_cb {
219 unsigned int pkt_len;
223 static inline int qdisc_qlen(struct Qdisc *q)
228 static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
230 return (struct qdisc_skb_cb *)skb->cb;
233 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
235 return &qdisc->q.lock;
238 static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
240 return qdisc->dev_queue->qdisc;
243 static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
245 return qdisc->dev_queue->qdisc_sleeping;
248 /* The qdisc root lock is a mechanism by which to top level
249 * of a qdisc tree can be locked from any qdisc node in the
250 * forest. This allows changing the configuration of some
251 * aspect of the qdisc tree while blocking out asynchronous
252 * qdisc access in the packet processing paths.
254 * It is only legal to do this when the root will not change
255 * on us. Otherwise we'll potentially lock the wrong qdisc
256 * root. This is enforced by holding the RTNL semaphore, which
257 * all users of this lock accessor must do.
259 static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
261 struct Qdisc *root = qdisc_root(qdisc);
264 return qdisc_lock(root);
267 static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
269 struct Qdisc *root = qdisc_root_sleeping(qdisc);
272 return qdisc_lock(root);
275 static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
277 return qdisc->dev_queue->dev;
280 static inline void sch_tree_lock(struct Qdisc *q)
282 spin_lock_bh(qdisc_root_sleeping_lock(q));
285 static inline void sch_tree_unlock(struct Qdisc *q)
287 spin_unlock_bh(qdisc_root_sleeping_lock(q));
290 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
291 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
293 extern struct Qdisc noop_qdisc;
294 extern struct Qdisc_ops noop_qdisc_ops;
295 extern struct Qdisc_ops pfifo_fast_ops;
296 extern struct Qdisc_ops mq_qdisc_ops;
298 struct Qdisc_class_common {
300 struct hlist_node hnode;
303 struct Qdisc_class_hash {
304 struct hlist_head *hash;
305 unsigned int hashsize;
306 unsigned int hashmask;
307 unsigned int hashelems;
310 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
317 static inline struct Qdisc_class_common *
318 qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
320 struct Qdisc_class_common *cl;
321 struct hlist_node *n;
324 h = qdisc_class_hash(id, hash->hashmask);
325 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
326 if (cl->classid == id)
332 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
333 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
334 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
335 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
336 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
338 extern void dev_init_scheduler(struct net_device *dev);
339 extern void dev_shutdown(struct net_device *dev);
340 extern void dev_activate(struct net_device *dev);
341 extern void dev_deactivate(struct net_device *dev);
342 extern void dev_deactivate_many(struct list_head *head);
343 extern struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
344 struct Qdisc *qdisc);
345 extern void qdisc_reset(struct Qdisc *qdisc);
346 extern void qdisc_destroy(struct Qdisc *qdisc);
347 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
348 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
349 struct Qdisc_ops *ops);
350 extern struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
351 struct Qdisc_ops *ops, u32 parentid);
352 extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
353 struct qdisc_size_table *stab);
354 extern void tcf_destroy(struct tcf_proto *tp);
355 extern void tcf_destroy_chain(struct tcf_proto **fl);
357 /* Reset all TX qdiscs greater then index of a device. */
358 static inline void qdisc_reset_all_tx_gt(struct net_device *dev, unsigned int i)
362 for (; i < dev->num_tx_queues; i++) {
363 qdisc = netdev_get_tx_queue(dev, i)->qdisc;
365 spin_lock_bh(qdisc_lock(qdisc));
367 spin_unlock_bh(qdisc_lock(qdisc));
372 static inline void qdisc_reset_all_tx(struct net_device *dev)
374 qdisc_reset_all_tx_gt(dev, 0);
377 /* Are all TX queues of the device empty? */
378 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
381 for (i = 0; i < dev->num_tx_queues; i++) {
382 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
383 const struct Qdisc *q = txq->qdisc;
391 /* Are any of the TX qdiscs changing? */
392 static inline bool qdisc_tx_changing(struct net_device *dev)
395 for (i = 0; i < dev->num_tx_queues; i++) {
396 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
397 if (txq->qdisc != txq->qdisc_sleeping)
403 /* Is the device using the noop qdisc on all queues? */
404 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
407 for (i = 0; i < dev->num_tx_queues; i++) {
408 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
409 if (txq->qdisc != &noop_qdisc)
415 static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
417 return qdisc_skb_cb(skb)->pkt_len;
420 /* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
421 enum net_xmit_qdisc_t {
422 __NET_XMIT_STOLEN = 0x00010000,
423 __NET_XMIT_BYPASS = 0x00020000,
426 #ifdef CONFIG_NET_CLS_ACT
427 #define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
429 #define net_xmit_drop_count(e) (1)
432 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
434 #ifdef CONFIG_NET_SCHED
436 qdisc_calculate_pkt_len(skb, sch->stab);
438 return sch->enqueue(skb, sch);
441 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
443 qdisc_skb_cb(skb)->pkt_len = skb->len;
444 return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
448 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
449 const struct sk_buff *skb)
451 bstats->bytes += qdisc_pkt_len(skb);
452 bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
455 static inline void qdisc_bstats_update(struct Qdisc *sch,
456 const struct sk_buff *skb)
458 bstats_update(&sch->bstats, skb);
461 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
462 struct sk_buff_head *list)
464 __skb_queue_tail(list, skb);
465 sch->qstats.backlog += qdisc_pkt_len(skb);
466 qdisc_bstats_update(sch, skb);
468 return NET_XMIT_SUCCESS;
471 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
473 return __qdisc_enqueue_tail(skb, sch, &sch->q);
476 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
477 struct sk_buff_head *list)
479 struct sk_buff *skb = __skb_dequeue(list);
481 if (likely(skb != NULL))
482 sch->qstats.backlog -= qdisc_pkt_len(skb);
487 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
489 return __qdisc_dequeue_head(sch, &sch->q);
492 static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
493 struct sk_buff_head *list)
495 struct sk_buff *skb = __qdisc_dequeue_head(sch, list);
497 if (likely(skb != NULL)) {
498 unsigned int len = qdisc_pkt_len(skb);
506 static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
508 return __qdisc_queue_drop_head(sch, &sch->q);
511 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
512 struct sk_buff_head *list)
514 struct sk_buff *skb = __skb_dequeue_tail(list);
516 if (likely(skb != NULL))
517 sch->qstats.backlog -= qdisc_pkt_len(skb);
522 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
524 return __qdisc_dequeue_tail(sch, &sch->q);
527 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
529 return skb_peek(&sch->q);
532 /* generic pseudo peek method for non-work-conserving qdisc */
533 static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
535 /* we can reuse ->gso_skb because peek isn't called for root qdiscs */
537 sch->gso_skb = sch->dequeue(sch);
539 /* it's still part of the queue */
546 /* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
547 static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
549 struct sk_buff *skb = sch->gso_skb;
555 skb = sch->dequeue(sch);
561 static inline void __qdisc_reset_queue(struct Qdisc *sch,
562 struct sk_buff_head *list)
565 * We do not know the backlog in bytes of this list, it
566 * is up to the caller to correct it
568 __skb_queue_purge(list);
571 static inline void qdisc_reset_queue(struct Qdisc *sch)
573 __qdisc_reset_queue(sch, &sch->q);
574 sch->qstats.backlog = 0;
577 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
578 struct sk_buff_head *list)
580 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
582 if (likely(skb != NULL)) {
583 unsigned int len = qdisc_pkt_len(skb);
591 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
593 return __qdisc_queue_drop(sch, &sch->q);
596 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
601 return NET_XMIT_DROP;
604 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
608 #ifdef CONFIG_NET_CLS_ACT
609 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
612 return NET_XMIT_SUCCESS;
617 return NET_XMIT_DROP;
620 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
621 long it will take to send a packet given its size.
623 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
625 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
628 slot >>= rtab->rate.cell_log;
630 return rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF];
631 return rtab->data[slot];
634 #ifdef CONFIG_NET_CLS_ACT
635 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
640 n = skb_clone(skb, gfp_mask);
643 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
644 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
645 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);