[linux-block.git] / include / net / sch_generic.h

#ifndef __NET_SCHED_GENERIC_H
#define __NET_SCHED_GENERIC_H

#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/rcupdate.h>
#include <linux/module.h>
#include <linux/pkt_sched.h>
#include <linux/pkt_cls.h>
#include <net/gen_stats.h>
#include <net/rtnetlink.h>

struct Qdisc_ops;
struct qdisc_walker;
struct tcf_walker;
struct module;

struct qdisc_rate_table
{
	struct tc_ratespec rate;
	u32		data[256];
	struct qdisc_rate_table *next;
	int		refcnt;
};

struct Qdisc
{
	int 			(*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
	struct sk_buff *	(*dequeue)(struct Qdisc *dev);
	unsigned		flags;
#define TCQ_F_BUILTIN	1
#define TCQ_F_THROTTLED	2
#define TCQ_F_INGRESS	4
	int			padded;
	struct Qdisc_ops	*ops;
	u32			handle;
	u32			parent;
	atomic_t		refcnt;
	struct sk_buff_head	q;
	struct netdev_queue	*dev_queue;
	struct list_head	list;

	struct gnet_stats_basic	bstats;
	struct gnet_stats_queue	qstats;
	struct gnet_stats_rate_est	rate_est;
	struct rcu_head 	q_rcu;
	int			(*reshape_fail)(struct sk_buff *skb,
					struct Qdisc *q);

	/* This field is deprecated, but it is still used by CBQ
	 * and it will live until better solution will be invented.
	 */
	struct Qdisc		*__parent;
};

struct Qdisc_class_ops
{
	/* Child qdisc manipulation */
	int			(*graft)(struct Qdisc *, unsigned long cl,
					struct Qdisc *, struct Qdisc **);
	struct Qdisc *		(*leaf)(struct Qdisc *, unsigned long cl);
	void			(*qlen_notify)(struct Qdisc *, unsigned long);

	/* Class manipulation routines */
	unsigned long		(*get)(struct Qdisc *, u32 classid);
	void			(*put)(struct Qdisc *, unsigned long);
	int			(*change)(struct Qdisc *, u32, u32,
					struct nlattr **, unsigned long *);
	int			(*delete)(struct Qdisc *, unsigned long);
	void			(*walk)(struct Qdisc *, struct qdisc_walker * arg);

	/* Filter manipulation */
	struct tcf_proto **	(*tcf_chain)(struct Qdisc *, unsigned long);
	unsigned long		(*bind_tcf)(struct Qdisc *, unsigned long,
					u32 classid);
	void			(*unbind_tcf)(struct Qdisc *, unsigned long);

	/* rtnetlink specific */
	int			(*dump)(struct Qdisc *, unsigned long,
					struct sk_buff *skb, struct tcmsg*);
	int			(*dump_stats)(struct Qdisc *, unsigned long,
					struct gnet_dump *);
};

struct Qdisc_ops
{
	struct Qdisc_ops	*next;
	const struct Qdisc_class_ops	*cl_ops;
	char			id[IFNAMSIZ];
	int			priv_size;

	int 			(*enqueue)(struct sk_buff *, struct Qdisc *);
	struct sk_buff *	(*dequeue)(struct Qdisc *);
	int 			(*requeue)(struct sk_buff *, struct Qdisc *);
	unsigned int		(*drop)(struct Qdisc *);

	int			(*init)(struct Qdisc *, struct nlattr *arg);
	void			(*reset)(struct Qdisc *);
	void			(*destroy)(struct Qdisc *);
	int			(*change)(struct Qdisc *, struct nlattr *arg);

	int			(*dump)(struct Qdisc *, struct sk_buff *);
	int			(*dump_stats)(struct Qdisc *, struct gnet_dump *);

	struct module		*owner;
};


struct tcf_result
{
	unsigned long	class;
	u32		classid;
};

struct tcf_proto_ops
{
	struct tcf_proto_ops	*next;
	char			kind[IFNAMSIZ];

	int			(*classify)(struct sk_buff*, struct tcf_proto*,
					struct tcf_result *);
	int			(*init)(struct tcf_proto*);
	void			(*destroy)(struct tcf_proto*);

	unsigned long		(*get)(struct tcf_proto*, u32 handle);
	void			(*put)(struct tcf_proto*, unsigned long);
	int			(*change)(struct tcf_proto*, unsigned long,
					u32 handle, struct nlattr **,
					unsigned long *);
	int			(*delete)(struct tcf_proto*, unsigned long);
	void			(*walk)(struct tcf_proto*, struct tcf_walker *arg);

	/* rtnetlink specific */
	int			(*dump)(struct tcf_proto*, unsigned long,
					struct sk_buff *skb, struct tcmsg*);

	struct module		*owner;
};

struct tcf_proto
{
	/* Fast access part */
	struct tcf_proto	*next;
	void			*root;
	int			(*classify)(struct sk_buff*, struct tcf_proto*,
					struct tcf_result *);
	__be16			protocol;

	/* All the rest */
	u32			prio;
	u32			classid;
	struct Qdisc		*q;
	void			*data;
	struct tcf_proto_ops	*ops;
};

static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
{
	return qdisc->dev_queue->dev;
}

extern void qdisc_lock_tree(struct net_device *dev);
extern void qdisc_unlock_tree(struct net_device *dev);

#define sch_tree_lock(q)	qdisc_lock_tree(qdisc_dev(q))
#define sch_tree_unlock(q)	qdisc_unlock_tree(qdisc_dev(q))
#define tcf_tree_lock(tp)	qdisc_lock_tree(qdisc_dev((tp)->q))
#define tcf_tree_unlock(tp)	qdisc_unlock_tree(qdisc_dev((tp)->q))

extern struct Qdisc noop_qdisc;
extern struct Qdisc_ops noop_qdisc_ops;

struct Qdisc_class_common
{
	u32			classid;
	struct hlist_node	hnode;
};

struct Qdisc_class_hash
{
	struct hlist_head	*hash;
	unsigned int		hashsize;
	unsigned int		hashmask;
	unsigned int		hashelems;
};

static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
{
	id ^= id >> 8;
	id ^= id >> 4;
	return id & mask;
}

static inline struct Qdisc_class_common *
qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
{
	struct Qdisc_class_common *cl;
	struct hlist_node *n;
	unsigned int h;

	h = qdisc_class_hash(id, hash->hashmask);
	hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
		if (cl->classid == id)
			return cl;
	}
	return NULL;
}

extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
extern void qdisc_class_hash_insert(struct Qdisc_class_hash *, struct Qdisc_class_common *);
extern void qdisc_class_hash_remove(struct Qdisc_class_hash *, struct Qdisc_class_common *);
extern void qdisc_class_hash_grow(struct Qdisc *, struct Qdisc_class_hash *);
extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);

extern void dev_init_scheduler(struct net_device *dev);
extern void dev_shutdown(struct net_device *dev);
extern void dev_activate(struct net_device *dev);
extern void dev_deactivate(struct net_device *dev);
extern void qdisc_reset(struct Qdisc *qdisc);
extern void qdisc_destroy(struct Qdisc *qdisc);
extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
				 struct Qdisc_ops *ops);
extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
				       struct netdev_queue *dev_queue,
				       struct Qdisc_ops *ops, u32 parentid);
extern void tcf_destroy(struct tcf_proto *tp);
extern void tcf_destroy_chain(struct tcf_proto **fl);

/* Reset all TX qdiscs of a device.  */
static inline void qdisc_reset_all_tx(struct net_device *dev)
{
	qdisc_reset(dev->tx_queue.qdisc);
}

/* Are all TX queues of the device empty?  */
static inline bool qdisc_all_tx_empty(const struct net_device *dev)
{
	const struct netdev_queue *txq = &dev->tx_queue;
	const struct Qdisc *q = txq->qdisc;

	return (q->q.qlen == 0);
}

/* Are any of the TX qdiscs changing?  */
static inline bool qdisc_tx_changing(struct net_device *dev)
{
	struct netdev_queue *txq = &dev->tx_queue;

	return (txq->qdisc != txq->qdisc_sleeping);
}

/* Is the device using the noop qdisc?  */
static inline bool qdisc_tx_is_noop(const struct net_device *dev)
{
	const struct netdev_queue *txq = &dev->tx_queue;

	return (txq->qdisc == &noop_qdisc);
}

static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
				       struct sk_buff_head *list)
{
	__skb_queue_tail(list, skb);
	sch->qstats.backlog += skb->len;
	sch->bstats.bytes += skb->len;
	sch->bstats.packets++;

	return NET_XMIT_SUCCESS;
}

static inline int qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch)
{
	return __qdisc_enqueue_tail(skb, sch, &sch->q);
}

static inline struct sk_buff *__qdisc_dequeue_head(struct Qdisc *sch,
						   struct sk_buff_head *list)
{
	struct sk_buff *skb = __skb_dequeue(list);

	if (likely(skb != NULL))
		sch->qstats.backlog -= skb->len;

	return skb;
}

static inline struct sk_buff *qdisc_dequeue_head(struct Qdisc *sch)
{
	return __qdisc_dequeue_head(sch, &sch->q);
}

static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
						   struct sk_buff_head *list)
{
	struct sk_buff *skb = __skb_dequeue_tail(list);

	if (likely(skb != NULL))
		sch->qstats.backlog -= skb->len;

	return skb;
}

static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
{
	return __qdisc_dequeue_tail(sch, &sch->q);
}

static inline int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch,
				  struct sk_buff_head *list)
{
	__skb_queue_head(list, skb);
	sch->qstats.backlog += skb->len;
	sch->qstats.requeues++;

	return NET_XMIT_SUCCESS;
}

static inline int qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch)
{
	return __qdisc_requeue(skb, sch, &sch->q);
}

static inline void __qdisc_reset_queue(struct Qdisc *sch,
				       struct sk_buff_head *list)
{
	/*
	 * We do not know the backlog in bytes of this list, it
	 * is up to the caller to correct it
	 */
	skb_queue_purge(list);
}

static inline void qdisc_reset_queue(struct Qdisc *sch)
{
	__qdisc_reset_queue(sch, &sch->q);
	sch->qstats.backlog = 0;
}

static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
					      struct sk_buff_head *list)
{
	struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);

	if (likely(skb != NULL)) {
		unsigned int len = skb->len;
		kfree_skb(skb);
		return len;
	}

	return 0;
}

static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
{
	return __qdisc_queue_drop(sch, &sch->q);
}

static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
{
	kfree_skb(skb);
	sch->qstats.drops++;

	return NET_XMIT_DROP;
}

static inline int qdisc_reshape_fail(struct sk_buff *skb, struct Qdisc *sch)
{
	sch->qstats.drops++;

#ifdef CONFIG_NET_CLS_ACT
	if (sch->reshape_fail == NULL || sch->reshape_fail(skb, sch))
		goto drop;

	return NET_XMIT_SUCCESS;

drop:
#endif
	kfree_skb(skb);
	return NET_XMIT_DROP;
}

/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
   long it will take to send a packet given its size.
 */
static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
{
	int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
	if (slot < 0)
		slot = 0;
	slot >>= rtab->rate.cell_log;
	if (slot > 255)
		return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
	return rtab->data[slot];
}

#ifdef CONFIG_NET_CLS_ACT
static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask)
{
	struct sk_buff *n = skb_clone(skb, gfp_mask);

	if (n) {
		n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
		n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
		n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
	}
	return n;
}
#endif

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef __NET_SCHED_GENERIC_H
	2	#define __NET_SCHED_GENERIC_H
	3
1da177e4 LT	4	#include <linux/netdevice.h>
	5	#include <linux/types.h>
	6	#include <linux/rcupdate.h>
	7	#include <linux/module.h>
1da177e4 LT	8	#include <linux/pkt_sched.h>
	9	#include <linux/pkt_cls.h>
	10	#include <net/gen_stats.h>
be577ddc	11	#include <net/rtnetlink.h>
1da177e4 LT	12
	13	struct Qdisc_ops;
	14	struct qdisc_walker;
	15	struct tcf_walker;
	16	struct module;
	17
	18	struct qdisc_rate_table
	19	{
	20	struct tc_ratespec rate;
	21	u32 data[256];
	22	struct qdisc_rate_table *next;
	23	int refcnt;
	24	};
	25
	26	struct Qdisc
	27	{
	28	int (enqueue)(struct sk_buff skb, struct Qdisc *dev);
	29	struct sk_buff * (dequeue)(struct Qdisc dev);
	30	unsigned flags;
	31	#define TCQ_F_BUILTIN 1
	32	#define TCQ_F_THROTTLED 2
	33	#define TCQ_F_INGRESS 4
	34	int padded;
	35	struct Qdisc_ops *ops;
	36	u32 handle;
	37	u32 parent;
	38	atomic_t refcnt;
	39	struct sk_buff_head q;
bb949fbd	40	struct netdev_queue *dev_queue;
1da177e4 LT	41	struct list_head list;
	42
	43	struct gnet_stats_basic bstats;
	44	struct gnet_stats_queue qstats;
	45	struct gnet_stats_rate_est rate_est;
1da177e4 LT	46	struct rcu_head q_rcu;
	47	int (reshape_fail)(struct sk_buff skb,
	48	struct Qdisc *q);
	49
	50	/* This field is deprecated, but it is still used by CBQ
	51	* and it will live until better solution will be invented.
	52	*/
	53	struct Qdisc *__parent;
	54	};
	55
	56	struct Qdisc_class_ops
	57	{
	58	/* Child qdisc manipulation */
	59	int (graft)(struct Qdisc , unsigned long cl,
	60	struct Qdisc , struct Qdisc *);
	61	struct Qdisc * (leaf)(struct Qdisc , unsigned long cl);
43effa1e	62	void (qlen_notify)(struct Qdisc , unsigned long);
1da177e4 LT	63
	64	/* Class manipulation routines */
	65	unsigned long (get)(struct Qdisc , u32 classid);
	66	void (put)(struct Qdisc , unsigned long);
	67	int (change)(struct Qdisc , u32, u32,
1e90474c	68	struct nlattr *, unsigned long );
1da177e4 LT	69	int (delete)(struct Qdisc , unsigned long);
	70	void (walk)(struct Qdisc , struct qdisc_walker * arg);
	71
	72	/* Filter manipulation */
	73	struct tcf_proto ** (tcf_chain)(struct Qdisc , unsigned long);
	74	unsigned long (bind_tcf)(struct Qdisc , unsigned long,
	75	u32 classid);
	76	void (unbind_tcf)(struct Qdisc , unsigned long);
	77
	78	/* rtnetlink specific */
	79	int (dump)(struct Qdisc , unsigned long,
	80	struct sk_buff skb, struct tcmsg);
	81	int (dump_stats)(struct Qdisc , unsigned long,
	82	struct gnet_dump *);
	83	};
	84
	85	struct Qdisc_ops
	86	{
	87	struct Qdisc_ops *next;
20fea08b	88	const struct Qdisc_class_ops *cl_ops;
1da177e4 LT	89	char id[IFNAMSIZ];
	90	int priv_size;
	91
	92	int (enqueue)(struct sk_buff , struct Qdisc *);
	93	struct sk_buff * (dequeue)(struct Qdisc );
	94	int (requeue)(struct sk_buff , struct Qdisc *);
	95	unsigned int (drop)(struct Qdisc );
	96
1e90474c	97	int (init)(struct Qdisc , struct nlattr *arg);
1da177e4 LT	98	void (reset)(struct Qdisc );
1da177e4 LT	99	void (destroy)(struct Qdisc );
1e90474c	100	int (change)(struct Qdisc , struct nlattr *arg);
1da177e4 LT	101
	102	int (dump)(struct Qdisc , struct sk_buff *);
	103	int (dump_stats)(struct Qdisc , struct gnet_dump *);
	104
	105	struct module *owner;
	106	};
	107
	108
	109	struct tcf_result
	110	{
	111	unsigned long class;
	112	u32 classid;
	113	};
	114
	115	struct tcf_proto_ops
	116	{
	117	struct tcf_proto_ops *next;
	118	char kind[IFNAMSIZ];
	119
	120	int (classify)(struct sk_buff, struct tcf_proto*,
	121	struct tcf_result *);
	122	int (init)(struct tcf_proto);
	123	void (destroy)(struct tcf_proto);
	124
	125	unsigned long (get)(struct tcf_proto, u32 handle);
	126	void (put)(struct tcf_proto, unsigned long);
	127	int (change)(struct tcf_proto, unsigned long,
add93b61	128	u32 handle, struct nlattr **,
1da177e4 LT	129	unsigned long *);
	130	int (delete)(struct tcf_proto, unsigned long);
	131	void (walk)(struct tcf_proto, struct tcf_walker *arg);
	132
	133	/* rtnetlink specific */
	134	int (dump)(struct tcf_proto, unsigned long,
	135	struct sk_buff skb, struct tcmsg);
	136
	137	struct module *owner;
	138	};
	139
	140	struct tcf_proto
	141	{
	142	/* Fast access part */
	143	struct tcf_proto *next;
	144	void *root;
	145	int (classify)(struct sk_buff, struct tcf_proto*,
	146	struct tcf_result *);
66c6f529	147	__be16 protocol;
1da177e4 LT	148
	149	/* All the rest */
	150	u32 prio;
	151	u32 classid;
	152	struct Qdisc *q;
	153	void *data;
	154	struct tcf_proto_ops *ops;
	155	};
	156
5ce2d488 DM	157	static inline struct net_device qdisc_dev(struct Qdisc qdisc)
	158	{
	159	return qdisc->dev_queue->dev;
	160	}
1da177e4 LT	161
	162	extern void qdisc_lock_tree(struct net_device *dev);
	163	extern void qdisc_unlock_tree(struct net_device *dev);
	164
5ce2d488 DM	165	#define sch_tree_lock(q) qdisc_lock_tree(qdisc_dev(q))
	166	#define sch_tree_unlock(q) qdisc_unlock_tree(qdisc_dev(q))
	167	#define tcf_tree_lock(tp) qdisc_lock_tree(qdisc_dev((tp)->q))
	168	#define tcf_tree_unlock(tp) qdisc_unlock_tree(qdisc_dev((tp)->q))
1da177e4	169
e41a33e6 TG	170	extern struct Qdisc noop_qdisc;
	171	extern struct Qdisc_ops noop_qdisc_ops;
	172
6fe1c7a5 PM	173	struct Qdisc_class_common
	174	{
	175	u32 classid;
	176	struct hlist_node hnode;
	177	};
	178
	179	struct Qdisc_class_hash
	180	{
	181	struct hlist_head *hash;
	182	unsigned int hashsize;
	183	unsigned int hashmask;
	184	unsigned int hashelems;
	185	};
	186
	187	static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
	188	{
	189	id ^= id >> 8;
	190	id ^= id >> 4;
	191	return id & mask;
	192	}
	193
	194	static inline struct Qdisc_class_common *
	195	qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
	196	{
	197	struct Qdisc_class_common *cl;
	198	struct hlist_node *n;
	199	unsigned int h;
	200
	201	h = qdisc_class_hash(id, hash->hashmask);
	202	hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
	203	if (cl->classid == id)
	204	return cl;
	205	}
	206	return NULL;
	207	}
	208
	209	extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
	210	extern void qdisc_class_hash_insert(struct Qdisc_class_hash , struct Qdisc_class_common );
	211	extern void qdisc_class_hash_remove(struct Qdisc_class_hash , struct Qdisc_class_common );
	212	extern void qdisc_class_hash_grow(struct Qdisc , struct Qdisc_class_hash );
	213	extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
	214
e41a33e6 TG	215	extern void dev_init_scheduler(struct net_device *dev);
	216	extern void dev_shutdown(struct net_device *dev);
	217	extern void dev_activate(struct net_device *dev);
	218	extern void dev_deactivate(struct net_device *dev);
	219	extern void qdisc_reset(struct Qdisc *qdisc);
	220	extern void qdisc_destroy(struct Qdisc *qdisc);
43effa1e	221	extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
5ce2d488	222	extern struct Qdisc qdisc_alloc(struct netdev_queue dev_queue,
bb949fbd	223	struct Qdisc_ops *ops);
e41a33e6	224	extern struct Qdisc qdisc_create_dflt(struct net_device dev,
bb949fbd	225	struct netdev_queue *dev_queue,
9f9afec4	226	struct Qdisc_ops *ops, u32 parentid);
a48b5a61	227	extern void tcf_destroy(struct tcf_proto *tp);
ff31ab56	228	extern void tcf_destroy_chain(struct tcf_proto **fl);
1da177e4	229
5aa70995 DM	230	/* Reset all TX qdiscs of a device. */
	231	static inline void qdisc_reset_all_tx(struct net_device *dev)
	232	{
	233	qdisc_reset(dev->tx_queue.qdisc);
	234	}
	235
3e745dd6 DM	236	/* Are all TX queues of the device empty? */
	237	static inline bool qdisc_all_tx_empty(const struct net_device *dev)
	238	{
	239	const struct netdev_queue *txq = &dev->tx_queue;
	240	const struct Qdisc *q = txq->qdisc;
	241
	242	return (q->q.qlen == 0);
	243	}
	244
6fa9864b DM	245	/* Are any of the TX qdiscs changing? */
	246	static inline bool qdisc_tx_changing(struct net_device *dev)
	247	{
	248	struct netdev_queue *txq = &dev->tx_queue;
	249
	250	return (txq->qdisc != txq->qdisc_sleeping);
	251	}
	252
05297949 DM	253	/* Is the device using the noop qdisc? */
	254	static inline bool qdisc_tx_is_noop(const struct net_device *dev)
	255	{
	256	const struct netdev_queue *txq = &dev->tx_queue;
	257
	258	return (txq->qdisc == &noop_qdisc);
	259	}
	260
9972b25d TG	261	static inline int __qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch,
	262	struct sk_buff_head *list)
	263	{
	264	__skb_queue_tail(list, skb);
	265	sch->qstats.backlog += skb->len;
	266	sch->bstats.bytes += skb->len;
	267	sch->bstats.packets++;
	268
	269	return NET_XMIT_SUCCESS;
	270	}
	271
	272	static inline int qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch)
	273	{
	274	return __qdisc_enqueue_tail(skb, sch, &sch->q);
	275	}
	276
	277	static inline struct sk_buff __qdisc_dequeue_head(struct Qdisc sch,
	278	struct sk_buff_head *list)
	279	{
	280	struct sk_buff *skb = __skb_dequeue(list);
	281
	282	if (likely(skb != NULL))
	283	sch->qstats.backlog -= skb->len;
	284
	285	return skb;
	286	}
	287
	288	static inline struct sk_buff qdisc_dequeue_head(struct Qdisc sch)
	289	{
	290	return __qdisc_dequeue_head(sch, &sch->q);
	291	}
	292
	293	static inline struct sk_buff __qdisc_dequeue_tail(struct Qdisc sch,
	294	struct sk_buff_head *list)
	295	{
	296	struct sk_buff *skb = __skb_dequeue_tail(list);
	297
	298	if (likely(skb != NULL))
	299	sch->qstats.backlog -= skb->len;
	300
	301	return skb;
	302	}
	303
	304	static inline struct sk_buff qdisc_dequeue_tail(struct Qdisc sch)
	305	{
	306	return __qdisc_dequeue_tail(sch, &sch->q);
	307	}
	308
	309	static inline int __qdisc_requeue(struct sk_buff skb, struct Qdisc sch,
	310	struct sk_buff_head *list)
	311	{
	312	__skb_queue_head(list, skb);
	313	sch->qstats.backlog += skb->len;
	314	sch->qstats.requeues++;
	315
	316	return NET_XMIT_SUCCESS;
	317	}
	318
	319	static inline int qdisc_requeue(struct sk_buff skb, struct Qdisc sch)
	320	{
	321	return __qdisc_requeue(skb, sch, &sch->q);
	322	}
	323
	324	static inline void __qdisc_reset_queue(struct Qdisc *sch,
325	struct sk_buff_head *list)
326	{
327	/*
328	* We do not know the backlog in bytes of this list, it
329	* is up to the caller to correct it
330	*/
331	skb_queue_purge(list);
332	}
333
334	static inline void qdisc_reset_queue(struct Qdisc *sch)
335	{
336	__qdisc_reset_queue(sch, &sch->q);
337	sch->qstats.backlog = 0;
338	}
339
340	static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
341	struct sk_buff_head *list)
342	{
343	struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
344
345	if (likely(skb != NULL)) {
346	unsigned int len = skb->len;
347	kfree_skb(skb);
348	return len;
349	}
350
351	return 0;
352	}
353
354	static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
355	{
356	return __qdisc_queue_drop(sch, &sch->q);
357	}
358
359	static inline int qdisc_drop(struct sk_buff skb, struct Qdisc sch)
360	{
361	kfree_skb(skb);
362	sch->qstats.drops++;
363
364	return NET_XMIT_DROP;
365	}
366
367	static inline int qdisc_reshape_fail(struct sk_buff skb, struct Qdisc sch)
368	{
369	sch->qstats.drops++;
370
c3bc7cff	371	#ifdef CONFIG_NET_CLS_ACT
9972b25d TG	372	if (sch->reshape_fail == NULL \|\| sch->reshape_fail(skb, sch))
	373	goto drop;
	374
	375	return NET_XMIT_SUCCESS;
	376
	377	drop:
	378	#endif
	379	kfree_skb(skb);
	380	return NET_XMIT_DROP;
	381	}
	382
e9bef55d JDB	383	/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
	384	long it will take to send a packet given its size.
	385	*/
	386	static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
	387	{
e08b0998 JDB	388	int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
	389	if (slot < 0)
	390	slot = 0;
e9bef55d JDB	391	slot >>= rtab->rate.cell_log;
	392	if (slot > 255)
	393	return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
	394	return rtab->data[slot];
	395	}
	396
12da81d1 JHS	397	#ifdef CONFIG_NET_CLS_ACT
	398	static inline struct sk_buff skb_act_clone(struct sk_buff skb, gfp_t gfp_mask)
	399	{
	400	struct sk_buff *n = skb_clone(skb, gfp_mask);
	401
	402	if (n) {
	403	n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
	404	n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
	405	n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
12da81d1 JHS	406	}
	407	return n;
	408	}
	409	#endif
	410
1da177e4	411	#endif