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
20 struct tc_ratespec rate;
22 struct qdisc_rate_table *next;
28 __QDISC_STATE_RUNNING,
32 struct qdisc_size_table {
33 struct list_head list;
34 struct tc_sizespec szopts;
41 int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
42 struct sk_buff * (*dequeue)(struct Qdisc *dev);
44 #define TCQ_F_BUILTIN 1
45 #define TCQ_F_THROTTLED 2
46 #define TCQ_F_INGRESS 4
48 struct Qdisc_ops *ops;
49 struct qdisc_size_table *stab;
54 struct sk_buff *gso_skb;
55 struct sk_buff_head q;
56 struct netdev_queue *dev_queue;
57 struct Qdisc *next_sched;
58 struct list_head list;
60 struct gnet_stats_basic bstats;
61 struct gnet_stats_queue qstats;
62 struct gnet_stats_rate_est rate_est;
63 struct rcu_head q_rcu;
64 int (*reshape_fail)(struct sk_buff *skb,
69 /* This field is deprecated, but it is still used by CBQ
70 * and it will live until better solution will be invented.
72 struct Qdisc *__parent;
75 struct Qdisc_class_ops
77 /* Child qdisc manipulation */
78 int (*graft)(struct Qdisc *, unsigned long cl,
79 struct Qdisc *, struct Qdisc **);
80 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
81 void (*qlen_notify)(struct Qdisc *, unsigned long);
83 /* Class manipulation routines */
84 unsigned long (*get)(struct Qdisc *, u32 classid);
85 void (*put)(struct Qdisc *, unsigned long);
86 int (*change)(struct Qdisc *, u32, u32,
87 struct nlattr **, unsigned long *);
88 int (*delete)(struct Qdisc *, unsigned long);
89 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
91 /* Filter manipulation */
92 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
93 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
95 void (*unbind_tcf)(struct Qdisc *, unsigned long);
97 /* rtnetlink specific */
98 int (*dump)(struct Qdisc *, unsigned long,
99 struct sk_buff *skb, struct tcmsg*);
100 int (*dump_stats)(struct Qdisc *, unsigned long,
106 struct Qdisc_ops *next;
107 const struct Qdisc_class_ops *cl_ops;
111 int (*enqueue)(struct sk_buff *, struct Qdisc *);
112 struct sk_buff * (*dequeue)(struct Qdisc *);
113 int (*requeue)(struct sk_buff *, struct Qdisc *);
114 unsigned int (*drop)(struct Qdisc *);
116 int (*init)(struct Qdisc *, struct nlattr *arg);
117 void (*reset)(struct Qdisc *);
118 void (*destroy)(struct Qdisc *);
119 int (*change)(struct Qdisc *, struct nlattr *arg);
121 int (*dump)(struct Qdisc *, struct sk_buff *);
122 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
124 struct module *owner;
136 struct tcf_proto_ops *next;
139 int (*classify)(struct sk_buff*, struct tcf_proto*,
140 struct tcf_result *);
141 int (*init)(struct tcf_proto*);
142 void (*destroy)(struct tcf_proto*);
144 unsigned long (*get)(struct tcf_proto*, u32 handle);
145 void (*put)(struct tcf_proto*, unsigned long);
146 int (*change)(struct tcf_proto*, unsigned long,
147 u32 handle, struct nlattr **,
149 int (*delete)(struct tcf_proto*, unsigned long);
150 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
152 /* rtnetlink specific */
153 int (*dump)(struct tcf_proto*, unsigned long,
154 struct sk_buff *skb, struct tcmsg*);
156 struct module *owner;
161 /* Fast access part */
162 struct tcf_proto *next;
164 int (*classify)(struct sk_buff*, struct tcf_proto*,
165 struct tcf_result *);
173 struct tcf_proto_ops *ops;
176 struct qdisc_skb_cb {
177 unsigned int pkt_len;
181 static inline struct qdisc_skb_cb *qdisc_skb_cb(struct sk_buff *skb)
183 return (struct qdisc_skb_cb *)skb->cb;
186 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
188 return &qdisc->q.lock;
191 static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
193 return qdisc->dev_queue->qdisc;
196 static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
198 struct Qdisc *root = qdisc_root(qdisc);
200 return qdisc_lock(root);
203 static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
205 return qdisc->dev_queue->dev;
208 static inline void sch_tree_lock(struct Qdisc *q)
210 spin_lock_bh(qdisc_root_lock(q));
213 static inline void sch_tree_unlock(struct Qdisc *q)
215 spin_unlock_bh(qdisc_root_lock(q));
218 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
219 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
221 extern struct Qdisc noop_qdisc;
222 extern struct Qdisc_ops noop_qdisc_ops;
224 struct Qdisc_class_common
227 struct hlist_node hnode;
230 struct Qdisc_class_hash
232 struct hlist_head *hash;
233 unsigned int hashsize;
234 unsigned int hashmask;
235 unsigned int hashelems;
238 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
245 static inline struct Qdisc_class_common *
246 qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
248 struct Qdisc_class_common *cl;
249 struct hlist_node *n;
252 h = qdisc_class_hash(id, hash->hashmask);
253 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
254 if (cl->classid == id)
260 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
261 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
262 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
263 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
264 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
266 extern void dev_init_scheduler(struct net_device *dev);
267 extern void dev_shutdown(struct net_device *dev);
268 extern void dev_activate(struct net_device *dev);
269 extern void dev_deactivate(struct net_device *dev);
270 extern void qdisc_reset(struct Qdisc *qdisc);
271 extern void qdisc_destroy(struct Qdisc *qdisc);
272 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
273 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
274 struct Qdisc_ops *ops);
275 extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
276 struct netdev_queue *dev_queue,
277 struct Qdisc_ops *ops, u32 parentid);
278 extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
279 struct qdisc_size_table *stab);
280 extern void tcf_destroy(struct tcf_proto *tp);
281 extern void tcf_destroy_chain(struct tcf_proto **fl);
283 /* Reset all TX qdiscs of a device. */
284 static inline void qdisc_reset_all_tx(struct net_device *dev)
287 for (i = 0; i < dev->num_tx_queues; i++)
288 qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
291 /* Are all TX queues of the device empty? */
292 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
295 for (i = 0; i < dev->num_tx_queues; i++) {
296 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
297 const struct Qdisc *q = txq->qdisc;
305 /* Are any of the TX qdiscs changing? */
306 static inline bool qdisc_tx_changing(struct net_device *dev)
309 for (i = 0; i < dev->num_tx_queues; i++) {
310 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
311 if (txq->qdisc != txq->qdisc_sleeping)
317 /* Is the device using the noop qdisc on all queues? */
318 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
321 for (i = 0; i < dev->num_tx_queues; i++) {
322 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
323 if (txq->qdisc != &noop_qdisc)
329 static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
331 return qdisc_skb_cb(skb)->pkt_len;
334 static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
336 #ifdef CONFIG_NET_SCHED
338 qdisc_calculate_pkt_len(skb, sch->stab);
340 return sch->enqueue(skb, sch);
343 static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
345 qdisc_skb_cb(skb)->pkt_len = skb->len;
346 return qdisc_enqueue(skb, sch);
349 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
350 struct sk_buff_head *list)
352 __skb_queue_tail(list, skb);
353 sch->qstats.backlog += qdisc_pkt_len(skb);
354 sch->bstats.bytes += qdisc_pkt_len(skb);
355 sch->bstats.packets++;
357 return NET_XMIT_SUCCESS;
360 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
362 return __qdisc_enqueue_tail(skb, sch, &sch->q);
365 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
366 struct sk_buff_head *list)
368 struct sk_buff *skb = __skb_dequeue(list);
370 if (likely(skb != NULL))
371 sch->qstats.backlog -= qdisc_pkt_len(skb);
376 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
378 return __qdisc_dequeue_head(sch, &sch->q);
381 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
382 struct sk_buff_head *list)
384 struct sk_buff *skb = __skb_dequeue_tail(list);
386 if (likely(skb != NULL))
387 sch->qstats.backlog -= qdisc_pkt_len(skb);
392 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
394 return __qdisc_dequeue_tail(sch, &sch->q);
397 static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch,
398 struct sk_buff_head *list)
400 __skb_queue_head(list, skb);
401 sch->qstats.backlog += qdisc_pkt_len(skb);
402 sch->qstats.requeues++;
404 return NET_XMIT_SUCCESS;
407 static inline int qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch)
409 return __qdisc_requeue(skb, sch, &sch->q);
412 static inline void __qdisc_reset_queue(struct Qdisc *sch,
413 struct sk_buff_head *list)
416 * We do not know the backlog in bytes of this list, it
417 * is up to the caller to correct it
419 __skb_queue_purge(list);
422 static inline void qdisc_reset_queue(struct Qdisc *sch)
424 __qdisc_reset_queue(sch, &sch->q);
425 sch->qstats.backlog = 0;
428 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
429 struct sk_buff_head *list)
431 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
433 if (likely(skb != NULL)) {
434 unsigned int len = qdisc_pkt_len(skb);
442 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
444 return __qdisc_queue_drop(sch, &sch->q);
447 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
452 return NET_XMIT_DROP;
455 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
459 #ifdef CONFIG_NET_CLS_ACT
460 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
463 return NET_XMIT_SUCCESS;
468 return NET_XMIT_DROP;
471 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
472 long it will take to send a packet given its size.
474 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
476 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
479 slot >>= rtab->rate.cell_log;
481 return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
482 return rtab->data[slot];
485 #ifdef CONFIG_NET_CLS_ACT
486 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
488 struct sk_buff *n = skb_clone(skb, gfp_mask);
491 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
492 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
493 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);