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 struct Qdisc *qdisc_root(struct Qdisc *qdisc)
168 return qdisc->dev_queue->qdisc;
171 static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
173 struct Qdisc *root = qdisc_root(qdisc);
175 return &root->dev_queue->lock;
178 static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
180 return qdisc->dev_queue->dev;
183 extern void qdisc_lock_tree(struct net_device *dev);
184 extern void qdisc_unlock_tree(struct net_device *dev);
186 #define sch_tree_lock(q) qdisc_lock_tree(qdisc_dev(q))
187 #define sch_tree_unlock(q) qdisc_unlock_tree(qdisc_dev(q))
188 #define tcf_tree_lock(tp) qdisc_lock_tree(qdisc_dev((tp)->q))
189 #define tcf_tree_unlock(tp) qdisc_unlock_tree(qdisc_dev((tp)->q))
191 extern struct Qdisc noop_qdisc;
192 extern struct Qdisc_ops noop_qdisc_ops;
194 struct Qdisc_class_common
197 struct hlist_node hnode;
200 struct Qdisc_class_hash
202 struct hlist_head *hash;
203 unsigned int hashsize;
204 unsigned int hashmask;
205 unsigned int hashelems;
208 static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
215 static inline struct Qdisc_class_common *
216 qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
218 struct Qdisc_class_common *cl;
219 struct hlist_node *n;
222 h = qdisc_class_hash(id, hash->hashmask);
223 hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
224 if (cl->classid == id)
230 extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
231 extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
232 extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
233 extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
234 extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
236 extern void dev_init_scheduler(struct net_device *dev);
237 extern void dev_shutdown(struct net_device *dev);
238 extern void dev_activate(struct net_device *dev);
239 extern void dev_deactivate(struct net_device *dev);
240 extern void qdisc_reset(struct Qdisc *qdisc);
241 extern void qdisc_destroy(struct Qdisc *qdisc);
242 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
243 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
244 struct Qdisc_ops *ops);
245 extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
246 struct netdev_queue *dev_queue,
247 struct Qdisc_ops *ops, u32 parentid);
248 extern void tcf_destroy(struct tcf_proto *tp);
249 extern void tcf_destroy_chain(struct tcf_proto **fl);
251 /* Reset all TX qdiscs of a device. */
252 static inline void qdisc_reset_all_tx(struct net_device *dev)
255 for (i = 0; i < dev->num_tx_queues; i++)
256 qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
259 /* Are all TX queues of the device empty? */
260 static inline bool qdisc_all_tx_empty(const struct net_device *dev)
263 for (i = 0; i < dev->num_tx_queues; i++) {
264 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
265 const struct Qdisc *q = txq->qdisc;
273 /* Are any of the TX qdiscs changing? */
274 static inline bool qdisc_tx_changing(struct net_device *dev)
277 for (i = 0; i < dev->num_tx_queues; i++) {
278 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
279 if (txq->qdisc != txq->qdisc_sleeping)
285 /* Is the device using the noop qdisc on all queues? */
286 static inline bool qdisc_tx_is_noop(const struct net_device *dev)
289 for (i = 0; i < dev->num_tx_queues; i++) {
290 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
291 if (txq->qdisc != &noop_qdisc)
297 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
298 struct sk_buff_head *list)
300 __skb_queue_tail(list, skb);
301 sch->qstats.backlog += skb->len;
302 sch->bstats.bytes += skb->len;
303 sch->bstats.packets++;
305 return NET_XMIT_SUCCESS;
308 static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
310 return __qdisc_enqueue_tail(skb, sch, &sch->q);
313 static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
314 struct sk_buff_head *list)
316 struct sk_buff *skb = __skb_dequeue(list);
318 if (likely(skb != NULL))
319 sch->qstats.backlog -= skb->len;
324 static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
326 return __qdisc_dequeue_head(sch, &sch->q);
329 static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
330 struct sk_buff_head *list)
332 struct sk_buff *skb = __skb_dequeue_tail(list);
334 if (likely(skb != NULL))
335 sch->qstats.backlog -= skb->len;
340 static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
342 return __qdisc_dequeue_tail(sch, &sch->q);
345 static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch,
346 struct sk_buff_head *list)
348 __skb_queue_head(list, skb);
349 sch->qstats.backlog += skb->len;
350 sch->qstats.requeues++;
352 return NET_XMIT_SUCCESS;
355 static inline int qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch)
357 return __qdisc_requeue(skb, sch, &sch->q);
360 static inline void __qdisc_reset_queue(struct Qdisc *sch,
361 struct sk_buff_head *list)
364 * We do not know the backlog in bytes of this list, it
365 * is up to the caller to correct it
367 skb_queue_purge(list);
370 static inline void qdisc_reset_queue(struct Qdisc *sch)
372 __qdisc_reset_queue(sch, &sch->q);
373 sch->qstats.backlog = 0;
376 static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
377 struct sk_buff_head *list)
379 struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
381 if (likely(skb != NULL)) {
382 unsigned int len = skb->len;
390 static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
392 return __qdisc_queue_drop(sch, &sch->q);
395 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
400 return NET_XMIT_DROP;
403 static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
407 #ifdef CONFIG_NET_CLS_ACT
408 if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
411 return NET_XMIT_SUCCESS;
416 return NET_XMIT_DROP;
419 /* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
420 long it will take to send a packet given its size.
422 static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
424 int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
427 slot >>= rtab->rate.cell_log;
429 return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
430 return rtab->data[slot];
433 #ifdef CONFIG_NET_CLS_ACT
434 static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
436 struct sk_buff *n = skb_clone(skb, gfp_mask);
439 n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
440 n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
441 n->tc_verd = CLR_TC_MUNGED(n->tc_verd);