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,
34 int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
35 struct sk_buff * (*dequeue)(struct Qdisc *dev);
37 #define TCQ_F_BUILTIN 1
38 #define TCQ_F_THROTTLED 2
39 #define TCQ_F_INGRESS 4
41 struct Qdisc_ops *ops;
46 struct sk_buff *gso_skb;
47 struct sk_buff_head q;
48 struct netdev_queue *dev_queue;
49 struct Qdisc *next_sched;
50 struct list_head list;
52 struct gnet_stats_basic bstats;
53 struct gnet_stats_queue qstats;
54 struct gnet_stats_rate_est rate_est;
55 struct rcu_head q_rcu;
56 int (*reshape_fail)(struct sk_buff *skb,
59 /* This field is deprecated, but it is still used by CBQ
60 * and it will live until better solution will be invented.
62 struct Qdisc *__parent;
65 struct Qdisc_class_ops
67 /* Child qdisc manipulation */
68 int (*graft)(struct Qdisc *, unsigned long cl,
69 struct Qdisc *, struct Qdisc **);
70 struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
71 void (*qlen_notify)(struct Qdisc *, unsigned long);
73 /* Class manipulation routines */
74 unsigned long (*get)(struct Qdisc *, u32 classid);
75 void (*put)(struct Qdisc *, unsigned long);
76 int (*change)(struct Qdisc *, u32, u32,
77 struct nlattr **, unsigned long *);
78 int (*delete)(struct Qdisc *, unsigned long);
79 void (*walk)(struct Qdisc *, struct qdisc_walker * arg);
81 /* Filter manipulation */
82 struct tcf_proto ** (*tcf_chain)(struct Qdisc *, unsigned long);
83 unsigned long (*bind_tcf)(struct Qdisc *, unsigned long,
85 void (*unbind_tcf)(struct Qdisc *, unsigned long);
87 /* rtnetlink specific */
88 int (*dump)(struct Qdisc *, unsigned long,
89 struct sk_buff *skb, struct tcmsg*);
90 int (*dump_stats)(struct Qdisc *, unsigned long,
96 struct Qdisc_ops *next;
97 const struct Qdisc_class_ops *cl_ops;
101 int (*enqueue)(struct sk_buff *, struct Qdisc *);
102 struct sk_buff * (*dequeue)(struct Qdisc *);
103 int (*requeue)(struct sk_buff *, struct Qdisc *);
104 unsigned int (*drop)(struct Qdisc *);
106 int (*init)(struct Qdisc *, struct nlattr *arg);
107 void (*reset)(struct Qdisc *);
108 void (*destroy)(struct Qdisc *);
109 int (*change)(struct Qdisc *, struct nlattr *arg);
111 int (*dump)(struct Qdisc *, struct sk_buff *);
112 int (*dump_stats)(struct Qdisc *, struct gnet_dump *);
114 struct module *owner;
126 struct tcf_proto_ops *next;
129 int (*classify)(struct sk_buff*, struct tcf_proto*,
130 struct tcf_result *);
131 int (*init)(struct tcf_proto*);
132 void (*destroy)(struct tcf_proto*);
134 unsigned long (*get)(struct tcf_proto*, u32 handle);
135 void (*put)(struct tcf_proto*, unsigned long);
136 int (*change)(struct tcf_proto*, unsigned long,
137 u32 handle, struct nlattr **,
139 int (*delete)(struct tcf_proto*, unsigned long);
140 void (*walk)(struct tcf_proto*, struct tcf_walker *arg);
142 /* rtnetlink specific */
143 int (*dump)(struct tcf_proto*, unsigned long,
144 struct sk_buff *skb, struct tcmsg*);
146 struct module *owner;
151 /* Fast access part */
152 struct tcf_proto *next;
154 int (*classify)(struct sk_buff*, struct tcf_proto*,
155 struct tcf_result *);
163 struct tcf_proto_ops *ops;
166 static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
168 return &qdisc->q.lock;
171 static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
173 return qdisc->dev_queue->qdisc;
176 static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
178 struct Qdisc *root = qdisc_root(qdisc);
180 return qdisc_lock(root);
183 static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
185 return qdisc->dev_queue->dev;
188 static inline void sch_tree_lock(struct Qdisc *q)
190 spin_lock_bh(qdisc_root_lock(q));
193 static inline void sch_tree_unlock(struct Qdisc *q)
195 spin_unlock_bh(qdisc_root_lock(q));
198 #define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
199 #define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
201 extern struct Qdisc noop_qdisc;
202 extern struct Qdisc_ops noop_qdisc_ops;
204 struct Qdisc_class_common
207 struct hlist_node hnode;
210 struct Qdisc_class_hash
212 struct hlist_head *hash;
213 unsigned int hashsize;
214 unsigned int hashmask;
215 unsigned int hashelems;
218 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
225 static inline struct Qdisc_class_common *
226 qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
228 struct Qdisc_class_common *cl;
229 struct hlist_node *n;
232 h = qdisc_class_hash(id, hash->hashmask);
233 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
234 if (cl->classid == id)
240 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
241 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
242 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
243 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
244 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
246 extern void dev_init_scheduler(struct net_device *dev);
247 extern void dev_shutdown(struct net_device *dev);
248 extern void dev_activate(struct net_device *dev);
249 extern void dev_deactivate(struct net_device *dev);
250 extern void qdisc_reset(struct Qdisc *qdisc);
251 extern void qdisc_destroy(struct Qdisc *qdisc);
252 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
253 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
254 struct Qdisc_ops *ops);
255 extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
256 struct netdev_queue *dev_queue,
257 struct Qdisc_ops *ops, u32 parentid);
258 extern void tcf_destroy(struct tcf_proto *tp);
259 extern void tcf_destroy_chain(struct tcf_proto **fl);
261 /* Reset all TX qdiscs of a device. */
262 static inline void qdisc_reset_all_tx(struct net_device *dev)
265 for (i = 0; i < dev->num_tx_queues; i++)
266 qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
269 /* Are all TX queues of the device empty? */
270 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
273 for (i = 0; i < dev->num_tx_queues; i++) {
274 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
275 const struct Qdisc *q = txq->qdisc;
283 /* Are any of the TX qdiscs changing? */
284 static inline bool qdisc_tx_changing(struct net_device *dev)
287 for (i = 0; i < dev->num_tx_queues; i++) {
288 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
289 if (txq->qdisc != txq->qdisc_sleeping)
295 /* Is the device using the noop qdisc on all queues? */
296 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
299 for (i = 0; i < dev->num_tx_queues; i++) {
300 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
301 if (txq->qdisc != &noop_qdisc)
307 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
308 struct sk_buff_head *list)
310 __skb_queue_tail(list, skb);
311 sch->qstats.backlog += skb->len;
312 sch->bstats.bytes += skb->len;
313 sch->bstats.packets++;
315 return NET_XMIT_SUCCESS;
318 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
320 return __qdisc_enqueue_tail(skb, sch, &sch->q);
323 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
324 struct sk_buff_head *list)
326 struct sk_buff *skb = __skb_dequeue(list);
328 if (likely(skb != NULL))
329 sch->qstats.backlog -= skb->len;
334 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
336 return __qdisc_dequeue_head(sch, &sch->q);
339 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
340 struct sk_buff_head *list)
342 struct sk_buff *skb = __skb_dequeue_tail(list);
344 if (likely(skb != NULL))
345 sch->qstats.backlog -= skb->len;
350 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
352 return __qdisc_dequeue_tail(sch, &sch->q);
355 static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch,
356 struct sk_buff_head *list)
358 __skb_queue_head(list, skb);
359 sch->qstats.backlog += skb->len;
360 sch->qstats.requeues++;
362 return NET_XMIT_SUCCESS;
365 static inline int qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch)
367 return __qdisc_requeue(skb, sch, &sch->q);
370 static inline void __qdisc_reset_queue(struct Qdisc *sch,
371 struct sk_buff_head *list)
374 * We do not know the backlog in bytes of this list, it
375 * is up to the caller to correct it
377 skb_queue_purge(list);
380 static inline void qdisc_reset_queue(struct Qdisc *sch)
382 __qdisc_reset_queue(sch, &sch->q);
383 sch->qstats.backlog = 0;
386 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
387 struct sk_buff_head *list)
389 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
391 if (likely(skb != NULL)) {
392 unsigned int len = skb->len;
400 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
402 return __qdisc_queue_drop(sch, &sch->q);
405 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
410 return NET_XMIT_DROP;
413 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
417 #ifdef CONFIG_NET_CLS_ACT
418 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
421 return NET_XMIT_SUCCESS;
426 return NET_XMIT_DROP;
429 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
430 long it will take to send a packet given its size.
432 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
434 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
437 slot >>= rtab->rate.cell_log;
439 return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
440 return rtab->data[slot];
443 #ifdef CONFIG_NET_CLS_ACT
444 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
446 struct sk_buff *n = skb_clone(skb, gfp_mask);
449 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
450 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
451 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);