[mirror_ubuntu-hirsute-kernel.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;
};

enum qdisc_state_t
{
	__QDISC_STATE_RUNNING,
	__QDISC_STATE_SCHED,
};

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;
	unsigned long		state;
	struct sk_buff		*gso_skb;
	struct sk_buff_head	q;
	struct netdev_queue	*dev_queue;
	struct Qdisc		*next_sched;
	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);

	void			*u32_node;

	/* 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 spinlock_t *qdisc_lock(struct Qdisc *qdisc)
{
	return &qdisc->q.lock;
}

static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
{
	return qdisc->dev_queue->qdisc;
}

static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
{
	struct Qdisc *root = qdisc_root(qdisc);

	return qdisc_lock(root);
}

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

static inline void sch_tree_lock(struct Qdisc *q)
{
	spin_lock_bh(qdisc_root_lock(q));
}

static inline void sch_tree_unlock(struct Qdisc *q)
{
	spin_unlock_bh(qdisc_root_lock(q));
}

#define tcf_tree_lock(tp)	sch_tree_lock((tp)->q)
#define tcf_tree_unlock(tp)	sch_tree_unlock((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)
{
	unsigned int i;
	for (i = 0; i < dev->num_tx_queues; i++)
		qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
}

/* Are all TX queues of the device empty?  */
static inline bool qdisc_all_tx_empty(const struct net_device *dev)
{
	unsigned int i;
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
		const struct Qdisc *q = txq->qdisc;

		if (q->q.qlen)
			return false;
	}
	return true;
}

/* Are any of the TX qdiscs changing?  */
static inline bool qdisc_tx_changing(struct net_device *dev)
{
	unsigned int i;
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
		if (txq->qdisc != txq->qdisc_sleeping)
			return true;
	}
	return false;
}

/* Is the device using the noop qdisc on all queues?  */
static inline bool qdisc_tx_is_noop(const struct net_device *dev)
{
	unsigned int i;
	for (i = 0; i < dev->num_tx_queues; i++) {
		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
		if (txq->qdisc != &noop_qdisc)
			return false;
	}
	return true;
}

static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
	return sch->enqueue(skb, sch);
}

static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
{
	return qdisc_enqueue(skb, sch);
}

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
e2627c8c DM	26	enum qdisc_state_t
	27	{
	28	__QDISC_STATE_RUNNING,
37437bb2	29	__QDISC_STATE_SCHED,
e2627c8c DM	30	};
e2627c8c DM	31
1da177e4 LT	32	struct Qdisc
	33	{
	34	int (enqueue)(struct sk_buff skb, struct Qdisc *dev);
	35	struct sk_buff * (dequeue)(struct Qdisc dev);
	36	unsigned flags;
	37	#define TCQ_F_BUILTIN 1
	38	#define TCQ_F_THROTTLED 2
	39	#define TCQ_F_INGRESS 4
	40	int padded;
	41	struct Qdisc_ops *ops;
	42	u32 handle;
	43	u32 parent;
	44	atomic_t refcnt;
e2627c8c	45	unsigned long state;
d3b753db	46	struct sk_buff *gso_skb;
1da177e4	47	struct sk_buff_head q;
bb949fbd	48	struct netdev_queue *dev_queue;
37437bb2	49	struct Qdisc *next_sched;
1da177e4 LT	50	struct list_head list;
	51
	52	struct gnet_stats_basic bstats;
	53	struct gnet_stats_queue qstats;
	54	struct gnet_stats_rate_est rate_est;
1da177e4 LT	55	struct rcu_head q_rcu;
	56	int (reshape_fail)(struct sk_buff skb,
	57	struct Qdisc *q);
	58
72b25a91 DM	59	void *u32_node;
72b25a91 DM	60
1da177e4 LT	61	/* This field is deprecated, but it is still used by CBQ
	62	* and it will live until better solution will be invented.
	63	*/
	64	struct Qdisc *__parent;
	65	};
	66
	67	struct Qdisc_class_ops
	68	{
	69	/* Child qdisc manipulation */
	70	int (graft)(struct Qdisc , unsigned long cl,
	71	struct Qdisc , struct Qdisc *);
	72	struct Qdisc * (leaf)(struct Qdisc , unsigned long cl);
43effa1e	73	void (qlen_notify)(struct Qdisc , unsigned long);
1da177e4 LT	74
	75	/* Class manipulation routines */
	76	unsigned long (get)(struct Qdisc , u32 classid);
	77	void (put)(struct Qdisc , unsigned long);
	78	int (change)(struct Qdisc , u32, u32,
1e90474c	79	struct nlattr *, unsigned long );
1da177e4 LT	80	int (delete)(struct Qdisc , unsigned long);
	81	void (walk)(struct Qdisc , struct qdisc_walker * arg);
	82
	83	/* Filter manipulation */
	84	struct tcf_proto ** (tcf_chain)(struct Qdisc , unsigned long);
	85	unsigned long (bind_tcf)(struct Qdisc , unsigned long,
	86	u32 classid);
	87	void (unbind_tcf)(struct Qdisc , unsigned long);
	88
	89	/* rtnetlink specific */
	90	int (dump)(struct Qdisc , unsigned long,
	91	struct sk_buff skb, struct tcmsg);
	92	int (dump_stats)(struct Qdisc , unsigned long,
	93	struct gnet_dump *);
	94	};
	95
	96	struct Qdisc_ops
	97	{
	98	struct Qdisc_ops *next;
20fea08b	99	const struct Qdisc_class_ops *cl_ops;
1da177e4 LT	100	char id[IFNAMSIZ];
	101	int priv_size;
	102
	103	int (enqueue)(struct sk_buff , struct Qdisc *);
	104	struct sk_buff * (dequeue)(struct Qdisc );
	105	int (requeue)(struct sk_buff , struct Qdisc *);
	106	unsigned int (drop)(struct Qdisc );
	107
1e90474c	108	int (init)(struct Qdisc , struct nlattr *arg);
1da177e4 LT	109	void (reset)(struct Qdisc );
1da177e4 LT	110	void (destroy)(struct Qdisc );
1e90474c	111	int (change)(struct Qdisc , struct nlattr *arg);
1da177e4 LT	112
	113	int (dump)(struct Qdisc , struct sk_buff *);
	114	int (dump_stats)(struct Qdisc , struct gnet_dump *);
	115
	116	struct module *owner;
	117	};
	118
	119
	120	struct tcf_result
	121	{
	122	unsigned long class;
	123	u32 classid;
	124	};
	125
	126	struct tcf_proto_ops
	127	{
	128	struct tcf_proto_ops *next;
	129	char kind[IFNAMSIZ];
	130
	131	int (classify)(struct sk_buff, struct tcf_proto*,
	132	struct tcf_result *);
	133	int (init)(struct tcf_proto);
	134	void (destroy)(struct tcf_proto);
	135
	136	unsigned long (get)(struct tcf_proto, u32 handle);
	137	void (put)(struct tcf_proto, unsigned long);
	138	int (change)(struct tcf_proto, unsigned long,
add93b61	139	u32 handle, struct nlattr **,
1da177e4 LT	140	unsigned long *);
	141	int (delete)(struct tcf_proto, unsigned long);
	142	void (walk)(struct tcf_proto, struct tcf_walker *arg);
	143
	144	/* rtnetlink specific */
	145	int (dump)(struct tcf_proto, unsigned long,
	146	struct sk_buff skb, struct tcmsg);
	147
	148	struct module *owner;
	149	};
	150
	151	struct tcf_proto
	152	{
	153	/* Fast access part */
	154	struct tcf_proto *next;
	155	void *root;
	156	int (classify)(struct sk_buff, struct tcf_proto*,
	157	struct tcf_result *);
66c6f529	158	__be16 protocol;
1da177e4 LT	159
	160	/* All the rest */
	161	u32 prio;
	162	u32 classid;
	163	struct Qdisc *q;
	164	void *data;
	165	struct tcf_proto_ops *ops;
	166	};
	167
83874000 DM	168	static inline spinlock_t qdisc_lock(struct Qdisc qdisc)
	169	{
	170	return &qdisc->q.lock;
	171	}
	172
7698b4fc DM	173	static inline struct Qdisc qdisc_root(struct Qdisc qdisc)
	174	{
	175	return qdisc->dev_queue->qdisc;
	176	}
	177
	178	static inline spinlock_t qdisc_root_lock(struct Qdisc qdisc)
	179	{
	180	struct Qdisc *root = qdisc_root(qdisc);
	181
83874000	182	return qdisc_lock(root);
7698b4fc DM	183	}
7698b4fc DM	184
5ce2d488 DM	185	static inline struct net_device qdisc_dev(struct Qdisc qdisc)
	186	{
	187	return qdisc->dev_queue->dev;
	188	}
1da177e4	189
78a5b30b DM	190	static inline void sch_tree_lock(struct Qdisc *q)
	191	{
	192	spin_lock_bh(qdisc_root_lock(q));
	193	}
	194
	195	static inline void sch_tree_unlock(struct Qdisc *q)
	196	{
	197	spin_unlock_bh(qdisc_root_lock(q));
	198	}
	199
	200	#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
	201	#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
1da177e4	202
e41a33e6 TG	203	extern struct Qdisc noop_qdisc;
	204	extern struct Qdisc_ops noop_qdisc_ops;
	205
6fe1c7a5 PM	206	struct Qdisc_class_common
	207	{
	208	u32 classid;
	209	struct hlist_node hnode;
	210	};
	211
	212	struct Qdisc_class_hash
	213	{
	214	struct hlist_head *hash;
	215	unsigned int hashsize;
	216	unsigned int hashmask;
	217	unsigned int hashelems;
	218	};
	219
	220	static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
	221	{
	222	id ^= id >> 8;
	223	id ^= id >> 4;
	224	return id & mask;
	225	}
	226
	227	static inline struct Qdisc_class_common *
	228	qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
	229	{
	230	struct Qdisc_class_common *cl;
	231	struct hlist_node *n;
	232	unsigned int h;
	233
	234	h = qdisc_class_hash(id, hash->hashmask);
	235	hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
	236	if (cl->classid == id)
	237	return cl;
	238	}
	239	return NULL;
	240	}
	241
	242	extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
	243	extern void qdisc_class_hash_insert(struct Qdisc_class_hash , struct Qdisc_class_common );
	244	extern void qdisc_class_hash_remove(struct Qdisc_class_hash , struct Qdisc_class_common );
	245	extern void qdisc_class_hash_grow(struct Qdisc , struct Qdisc_class_hash );
	246	extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
	247
e41a33e6 TG	248	extern void dev_init_scheduler(struct net_device *dev);
	249	extern void dev_shutdown(struct net_device *dev);
	250	extern void dev_activate(struct net_device *dev);
	251	extern void dev_deactivate(struct net_device *dev);
	252	extern void qdisc_reset(struct Qdisc *qdisc);
	253	extern void qdisc_destroy(struct Qdisc *qdisc);
43effa1e	254	extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
5ce2d488	255	extern struct Qdisc qdisc_alloc(struct netdev_queue dev_queue,
bb949fbd	256	struct Qdisc_ops *ops);
e41a33e6	257	extern struct Qdisc qdisc_create_dflt(struct net_device dev,
bb949fbd	258	struct netdev_queue *dev_queue,
9f9afec4	259	struct Qdisc_ops *ops, u32 parentid);
a48b5a61	260	extern void tcf_destroy(struct tcf_proto *tp);
ff31ab56	261	extern void tcf_destroy_chain(struct tcf_proto **fl);
1da177e4	262
5aa70995 DM	263	/* Reset all TX qdiscs of a device. */
	264	static inline void qdisc_reset_all_tx(struct net_device *dev)
	265	{
e8a0464c DM	266	unsigned int i;
	267	for (i = 0; i < dev->num_tx_queues; i++)
	268	qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
5aa70995 DM	269	}
5aa70995 DM	270
3e745dd6 DM	271	/* Are all TX queues of the device empty? */
	272	static inline bool qdisc_all_tx_empty(const struct net_device *dev)
	273	{
e8a0464c DM	274	unsigned int i;
	275	for (i = 0; i < dev->num_tx_queues; i++) {
	276	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	277	const struct Qdisc *q = txq->qdisc;
3e745dd6	278
e8a0464c DM	279	if (q->q.qlen)
	280	return false;
	281	}
	282	return true;
3e745dd6 DM	283	}
3e745dd6 DM	284
6fa9864b DM	285	/* Are any of the TX qdiscs changing? */
	286	static inline bool qdisc_tx_changing(struct net_device *dev)
	287	{
e8a0464c DM	288	unsigned int i;
	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 != txq->qdisc_sleeping)
	292	return true;
	293	}
	294	return false;
6fa9864b DM	295	}
6fa9864b DM	296
e8a0464c	297	/* Is the device using the noop qdisc on all queues? */
05297949 DM	298	static inline bool qdisc_tx_is_noop(const struct net_device *dev)
05297949 DM	299	{
e8a0464c DM	300	unsigned int i;
	301	for (i = 0; i < dev->num_tx_queues; i++) {
	302	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	303	if (txq->qdisc != &noop_qdisc)
	304	return false;
	305	}
	306	return true;
05297949 DM	307	}
05297949 DM	308
5f86173b JK	309	static inline int qdisc_enqueue(struct sk_buff skb, struct Qdisc sch)
	310	{
	311	return sch->enqueue(skb, sch);
	312	}
	313
	314	static inline int qdisc_enqueue_root(struct sk_buff skb, struct Qdisc sch)
	315	{
	316	return qdisc_enqueue(skb, sch);
	317	}
	318
9972b25d TG	319	static inline int __qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch,
	320	struct sk_buff_head *list)
	321	{
	322	__skb_queue_tail(list, skb);
	323	sch->qstats.backlog += skb->len;
	324	sch->bstats.bytes += skb->len;
	325	sch->bstats.packets++;
	326
	327	return NET_XMIT_SUCCESS;
	328	}
	329
	330	static inline int qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch)
	331	{
	332	return __qdisc_enqueue_tail(skb, sch, &sch->q);
	333	}
	334
	335	static inline struct sk_buff __qdisc_dequeue_head(struct Qdisc sch,
	336	struct sk_buff_head *list)
	337	{
	338	struct sk_buff *skb = __skb_dequeue(list);
	339
	340	if (likely(skb != NULL))
	341	sch->qstats.backlog -= skb->len;
	342
	343	return skb;
	344	}
	345
	346	static inline struct sk_buff qdisc_dequeue_head(struct Qdisc sch)
	347	{
	348	return __qdisc_dequeue_head(sch, &sch->q);
	349	}
	350
	351	static inline struct sk_buff __qdisc_dequeue_tail(struct Qdisc sch,
	352	struct sk_buff_head *list)
	353	{
	354	struct sk_buff *skb = __skb_dequeue_tail(list);
	355
	356	if (likely(skb != NULL))
	357	sch->qstats.backlog -= skb->len;
	358
	359	return skb;
	360	}
	361
	362	static inline struct sk_buff qdisc_dequeue_tail(struct Qdisc sch)
	363	{
	364	return __qdisc_dequeue_tail(sch, &sch->q);
	365	}
	366
	367	static inline int __qdisc_requeue(struct sk_buff skb, struct Qdisc sch,
	368	struct sk_buff_head *list)
	369	{
	370	__skb_queue_head(list, skb);
	371	sch->qstats.backlog += skb->len;
	372	sch->qstats.requeues++;
	373
	374	return NET_XMIT_SUCCESS;
	375	}
	376
	377	static inline int qdisc_requeue(struct sk_buff skb, struct Qdisc sch)
	378	{
	379	return __qdisc_requeue(skb, sch, &sch->q);
	380	}
	381
	382	static inline void __qdisc_reset_queue(struct Qdisc *sch,
383	struct sk_buff_head *list)
384	{
385	/*
386	* We do not know the backlog in bytes of this list, it
387	* is up to the caller to correct it
388	*/
93245dd6	389	__skb_queue_purge(list);
9972b25d TG	390	}
	391
	392	static inline void qdisc_reset_queue(struct Qdisc *sch)
	393	{
	394	__qdisc_reset_queue(sch, &sch->q);
	395	sch->qstats.backlog = 0;
	396	}
	397
	398	static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
	399	struct sk_buff_head *list)
	400	{
	401	struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
	402
	403	if (likely(skb != NULL)) {
	404	unsigned int len = skb->len;
	405	kfree_skb(skb);
	406	return len;
	407	}
	408
	409	return 0;
	410	}
	411
	412	static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
	413	{
	414	return __qdisc_queue_drop(sch, &sch->q);
	415	}
	416
	417	static inline int qdisc_drop(struct sk_buff skb, struct Qdisc sch)
	418	{
	419	kfree_skb(skb);
	420	sch->qstats.drops++;
	421
	422	return NET_XMIT_DROP;
	423	}
	424
	425	static inline int qdisc_reshape_fail(struct sk_buff skb, struct Qdisc sch)
	426	{
	427	sch->qstats.drops++;
	428
c3bc7cff	429	#ifdef CONFIG_NET_CLS_ACT
9972b25d TG	430	if (sch->reshape_fail == NULL \|\| sch->reshape_fail(skb, sch))
	431	goto drop;
	432
	433	return NET_XMIT_SUCCESS;
	434
	435	drop:
	436	#endif
	437	kfree_skb(skb);
	438	return NET_XMIT_DROP;
	439	}
	440
e9bef55d JDB	441	/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
	442	long it will take to send a packet given its size.
	443	*/
	444	static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
	445	{
e08b0998 JDB	446	int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
	447	if (slot < 0)
	448	slot = 0;
e9bef55d JDB	449	slot >>= rtab->rate.cell_log;
	450	if (slot > 255)
	451	return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
	452	return rtab->data[slot];
	453	}
	454
12da81d1 JHS	455	#ifdef CONFIG_NET_CLS_ACT
	456	static inline struct sk_buff skb_act_clone(struct sk_buff skb, gfp_t gfp_mask)
	457	{
	458	struct sk_buff *n = skb_clone(skb, gfp_mask);
	459
	460	if (n) {
	461	n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
	462	n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
	463	n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
12da81d1 JHS	464	}
	465	return n;
	466	}
	467	#endif
	468
1da177e4	469	#endif