[net-next-2.6.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,
	__QDISC_STATE_DEACTIVATED,
};

struct qdisc_size_table {
	struct list_head	list;
	struct tc_sizespec	szopts;
	int			refcnt;
	u16			data[];
};

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
#define TCQ_F_CAN_BYPASS	8
#define TCQ_F_MQROOT		16
#define TCQ_F_WARN_NONWC	(1 << 16)
	int			padded;
	struct Qdisc_ops	*ops;
	struct qdisc_size_table	*stab;
	struct list_head	list;
	u32			handle;
	u32			parent;
	atomic_t		refcnt;
	struct gnet_stats_rate_est	rate_est;
	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 netdev_queue	*dev_queue;
	struct Qdisc		*next_sched;

	struct sk_buff		*gso_skb;
	/*
	 * For performance sake on SMP, we put highly modified fields at the end
	 */
	unsigned long		state;
	struct sk_buff_head	q;
	struct gnet_stats_basic_packed bstats;
	struct gnet_stats_queue	qstats;
};

struct Qdisc_class_ops {
	/* Child qdisc manipulation */
	struct netdev_queue *	(*select_queue)(struct Qdisc *, struct tcmsg *);
	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 *);
	struct sk_buff *	(*peek)(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);
	void			(*attach)(struct Qdisc *);

	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;
};

struct qdisc_skb_cb {
	unsigned int		pkt_len;
	char			data[];
};

static inline int qdisc_qlen(struct Qdisc *q)
{
	return q->q.qlen;
}

static inline struct qdisc_skb_cb *qdisc_skb_cb(struct sk_buff *skb)
{
	return (struct qdisc_skb_cb *)skb->cb;
}

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 struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
{
	return qdisc->dev_queue->qdisc_sleeping;
}

/* The qdisc root lock is a mechanism by which to top level
 * of a qdisc tree can be locked from any qdisc node in the
 * forest.  This allows changing the configuration of some
 * aspect of the qdisc tree while blocking out asynchronous
 * qdisc access in the packet processing paths.
 *
 * It is only legal to do this when the root will not change
 * on us.  Otherwise we'll potentially lock the wrong qdisc
 * root.  This is enforced by holding the RTNL semaphore, which
 * all users of this lock accessor must do.
 */
static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
{
	struct Qdisc *root = qdisc_root(qdisc);

	ASSERT_RTNL();
	return qdisc_lock(root);
}

static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
{
	struct Qdisc *root = qdisc_root_sleeping(qdisc);

	ASSERT_RTNL();
	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_sleeping_lock(q));
}

static inline void sch_tree_unlock(struct Qdisc *q)
{
	spin_unlock_bh(qdisc_root_sleeping_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;
extern struct Qdisc_ops pfifo_fast_ops;
extern struct Qdisc_ops mq_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 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
				     struct Qdisc *qdisc);
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 qdisc_calculate_pkt_len(struct sk_buff *skb,
				   struct qdisc_size_table *stab);
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 unsigned int qdisc_pkt_len(struct sk_buff *skb)
{
	return qdisc_skb_cb(skb)->pkt_len;
}

/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
enum net_xmit_qdisc_t {
	__NET_XMIT_STOLEN = 0x00010000,
	__NET_XMIT_BYPASS = 0x00020000,
};

#ifdef CONFIG_NET_CLS_ACT
#define net_xmit_drop_count(e)	((e) & __NET_XMIT_STOLEN ? 0 : 1)
#else
#define net_xmit_drop_count(e)	(1)
#endif

static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
#ifdef CONFIG_NET_SCHED
	if (sch->stab)
		qdisc_calculate_pkt_len(skb, sch->stab);
#endif
	return sch->enqueue(skb, sch);
}

static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
{
	qdisc_skb_cb(skb)->pkt_len = skb->len;
	return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
}

static inline void __qdisc_update_bstats(struct Qdisc *sch, unsigned int len)
{
	sch->bstats.bytes += len;
	sch->bstats.packets++;
}

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 += qdisc_pkt_len(skb);
	__qdisc_update_bstats(sch, qdisc_pkt_len(skb));

	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 -= qdisc_pkt_len(skb);

	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 -= qdisc_pkt_len(skb);

	return skb;
}

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

static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
{
	return skb_peek(&sch->q);
}

/* generic pseudo peek method for non-work-conserving qdisc */
static inline struct sk_buff *qdisc_peek_dequeued(struct Qdisc *sch)
{
	/* we can reuse ->gso_skb because peek isn't called for root qdiscs */
	if (!sch->gso_skb) {
		sch->gso_skb = sch->dequeue(sch);
		if (sch->gso_skb)
			/* it's still part of the queue */
			sch->q.qlen++;
	}

	return sch->gso_skb;
}

/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
static inline struct sk_buff *qdisc_dequeue_peeked(struct Qdisc *sch)
{
	struct sk_buff *skb = sch->gso_skb;

	if (skb) {
		sch->gso_skb = NULL;
		sch->q.qlen--;
	} else {
		skb = sch->dequeue(sch);
	}

	return skb;
}

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 = qdisc_pkt_len(skb);
		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
fd2c3ef7	18	struct qdisc_rate_table {
1da177e4 LT	19	struct tc_ratespec rate;
	20	u32 data[256];
	21	struct qdisc_rate_table *next;
	22	int refcnt;
	23	};
	24
fd2c3ef7	25	enum qdisc_state_t {
e2627c8c	26	__QDISC_STATE_RUNNING,
37437bb2	27	__QDISC_STATE_SCHED,
a9312ae8	28	__QDISC_STATE_DEACTIVATED,
e2627c8c DM	29	};
e2627c8c DM	30
175f9c1b JK	31	struct qdisc_size_table {
	32	struct list_head list;
	33	struct tc_sizespec szopts;
	34	int refcnt;
	35	u16 data[];
	36	};
	37
fd2c3ef7	38	struct Qdisc {
1da177e4 LT	39	int (enqueue)(struct sk_buff skb, struct Qdisc *dev);
	40	struct sk_buff * (dequeue)(struct Qdisc dev);
	41	unsigned flags;
b00355db JP	42	#define TCQ_F_BUILTIN 1
	43	#define TCQ_F_THROTTLED 2
	44	#define TCQ_F_INGRESS 4
bbd8a0d3	45	#define TCQ_F_CAN_BYPASS 8
23bcf634	46	#define TCQ_F_MQROOT 16
b00355db	47	#define TCQ_F_WARN_NONWC (1 << 16)
1da177e4 LT	48	int padded;
1da177e4 LT	49	struct Qdisc_ops *ops;
175f9c1b	50	struct qdisc_size_table *stab;
5e140dfc	51	struct list_head list;
1da177e4 LT	52	u32 handle;
	53	u32 parent;
	54	atomic_t refcnt;
1da177e4	55	struct gnet_stats_rate_est rate_est;
1da177e4 LT	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;
5e140dfc ED	65	struct netdev_queue *dev_queue;
	66	struct Qdisc *next_sched;
	67
	68	struct sk_buff *gso_skb;
	69	/*
	70	* For performance sake on SMP, we put highly modified fields at the end
	71	*/
	72	unsigned long state;
	73	struct sk_buff_head q;
c1a8f1f1	74	struct gnet_stats_basic_packed bstats;
5e140dfc	75	struct gnet_stats_queue qstats;
1da177e4 LT	76	};
1da177e4 LT	77
fd2c3ef7	78	struct Qdisc_class_ops {
1da177e4	79	/* Child qdisc manipulation */
926e61b7	80	struct netdev_queue * (select_queue)(struct Qdisc , struct tcmsg *);
1da177e4 LT	81	int (graft)(struct Qdisc , unsigned long cl,
	82	struct Qdisc , struct Qdisc *);
	83	struct Qdisc * (leaf)(struct Qdisc , unsigned long cl);
43effa1e	84	void (qlen_notify)(struct Qdisc , unsigned long);
1da177e4 LT	85
	86	/* Class manipulation routines */
	87	unsigned long (get)(struct Qdisc , u32 classid);
	88	void (put)(struct Qdisc , unsigned long);
	89	int (change)(struct Qdisc , u32, u32,
1e90474c	90	struct nlattr *, unsigned long );
1da177e4 LT	91	int (delete)(struct Qdisc , unsigned long);
	92	void (walk)(struct Qdisc , struct qdisc_walker * arg);
	93
	94	/* Filter manipulation */
	95	struct tcf_proto ** (tcf_chain)(struct Qdisc , unsigned long);
	96	unsigned long (bind_tcf)(struct Qdisc , unsigned long,
	97	u32 classid);
	98	void (unbind_tcf)(struct Qdisc , unsigned long);
	99
	100	/* rtnetlink specific */
	101	int (dump)(struct Qdisc , unsigned long,
	102	struct sk_buff skb, struct tcmsg);
	103	int (dump_stats)(struct Qdisc , unsigned long,
	104	struct gnet_dump *);
	105	};
	106
fd2c3ef7	107	struct Qdisc_ops {
1da177e4	108	struct Qdisc_ops *next;
20fea08b	109	const struct Qdisc_class_ops *cl_ops;
1da177e4 LT	110	char id[IFNAMSIZ];
	111	int priv_size;
	112
	113	int (enqueue)(struct sk_buff , struct Qdisc *);
	114	struct sk_buff * (dequeue)(struct Qdisc );
90d841fd	115	struct sk_buff * (peek)(struct Qdisc );
1da177e4 LT	116	unsigned int (drop)(struct Qdisc );
1da177e4 LT	117
1e90474c	118	int (init)(struct Qdisc , struct nlattr *arg);
1da177e4 LT	119	void (reset)(struct Qdisc );
1da177e4 LT	120	void (destroy)(struct Qdisc );
1e90474c	121	int (change)(struct Qdisc , struct nlattr *arg);
6ec1c69a	122	void (attach)(struct Qdisc );
1da177e4 LT	123
	124	int (dump)(struct Qdisc , struct sk_buff *);
	125	int (dump_stats)(struct Qdisc , struct gnet_dump *);
	126
	127	struct module *owner;
	128	};
	129
	130
fd2c3ef7	131	struct tcf_result {
1da177e4 LT	132	unsigned long class;
	133	u32 classid;
	134	};
	135
fd2c3ef7	136	struct tcf_proto_ops {
1da177e4 LT	137	struct tcf_proto_ops *next;
	138	char kind[IFNAMSIZ];
	139
	140	int (classify)(struct sk_buff, struct tcf_proto*,
	141	struct tcf_result *);
	142	int (init)(struct tcf_proto);
	143	void (destroy)(struct tcf_proto);
	144
	145	unsigned long (get)(struct tcf_proto, u32 handle);
	146	void (put)(struct tcf_proto, unsigned long);
	147	int (change)(struct tcf_proto, unsigned long,
add93b61	148	u32 handle, struct nlattr **,
1da177e4 LT	149	unsigned long *);
	150	int (delete)(struct tcf_proto, unsigned long);
	151	void (walk)(struct tcf_proto, struct tcf_walker *arg);
	152
	153	/* rtnetlink specific */
	154	int (dump)(struct tcf_proto, unsigned long,
	155	struct sk_buff skb, struct tcmsg);
	156
	157	struct module *owner;
	158	};
	159
fd2c3ef7	160	struct tcf_proto {
1da177e4 LT	161	/* Fast access part */
	162	struct tcf_proto *next;
	163	void *root;
	164	int (classify)(struct sk_buff, struct tcf_proto*,
	165	struct tcf_result *);
66c6f529	166	__be16 protocol;
1da177e4 LT	167
	168	/* All the rest */
	169	u32 prio;
	170	u32 classid;
	171	struct Qdisc *q;
	172	void *data;
	173	struct tcf_proto_ops *ops;
	174	};
	175
175f9c1b JK	176	struct qdisc_skb_cb {
	177	unsigned int pkt_len;
	178	char data[];
	179	};
	180
bbd8a0d3 KK	181	static inline int qdisc_qlen(struct Qdisc *q)
	182	{
	183	return q->q.qlen;
	184	}
	185
175f9c1b JK	186	static inline struct qdisc_skb_cb qdisc_skb_cb(struct sk_buff skb)
	187	{
	188	return (struct qdisc_skb_cb *)skb->cb;
	189	}
	190
83874000 DM	191	static inline spinlock_t qdisc_lock(struct Qdisc qdisc)
	192	{
	193	return &qdisc->q.lock;
	194	}
	195
7698b4fc DM	196	static inline struct Qdisc qdisc_root(struct Qdisc qdisc)
	197	{
	198	return qdisc->dev_queue->qdisc;
	199	}
	200
2540e051 JP	201	static inline struct Qdisc qdisc_root_sleeping(struct Qdisc qdisc)
	202	{
	203	return qdisc->dev_queue->qdisc_sleeping;
	204	}
	205
7e43f112 DM	206	/* The qdisc root lock is a mechanism by which to top level
	207	* of a qdisc tree can be locked from any qdisc node in the
	208	* forest. This allows changing the configuration of some
	209	* aspect of the qdisc tree while blocking out asynchronous
	210	* qdisc access in the packet processing paths.
	211	*
	212	* It is only legal to do this when the root will not change
	213	* on us. Otherwise we'll potentially lock the wrong qdisc
	214	* root. This is enforced by holding the RTNL semaphore, which
	215	* all users of this lock accessor must do.
	216	*/
7698b4fc DM	217	static inline spinlock_t qdisc_root_lock(struct Qdisc qdisc)
	218	{
	219	struct Qdisc *root = qdisc_root(qdisc);
	220
7e43f112	221	ASSERT_RTNL();
83874000	222	return qdisc_lock(root);
7698b4fc DM	223	}
7698b4fc DM	224
f6f9b93f JP	225	static inline spinlock_t qdisc_root_sleeping_lock(struct Qdisc qdisc)
	226	{
	227	struct Qdisc *root = qdisc_root_sleeping(qdisc);
	228
	229	ASSERT_RTNL();
	230	return qdisc_lock(root);
	231	}
	232
5ce2d488 DM	233	static inline struct net_device qdisc_dev(struct Qdisc qdisc)
	234	{
	235	return qdisc->dev_queue->dev;
	236	}
1da177e4	237
78a5b30b DM	238	static inline void sch_tree_lock(struct Qdisc *q)
78a5b30b DM	239	{
fe439dd0	240	spin_lock_bh(qdisc_root_sleeping_lock(q));
78a5b30b DM	241	}
	242
	243	static inline void sch_tree_unlock(struct Qdisc *q)
	244	{
fe439dd0	245	spin_unlock_bh(qdisc_root_sleeping_lock(q));
78a5b30b DM	246	}
	247
	248	#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
	249	#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
1da177e4	250
e41a33e6 TG	251	extern struct Qdisc noop_qdisc;
e41a33e6 TG	252	extern struct Qdisc_ops noop_qdisc_ops;
6ec1c69a DM	253	extern struct Qdisc_ops pfifo_fast_ops;
6ec1c69a DM	254	extern struct Qdisc_ops mq_qdisc_ops;
e41a33e6	255
fd2c3ef7	256	struct Qdisc_class_common {
6fe1c7a5 PM	257	u32 classid;
	258	struct hlist_node hnode;
	259	};
	260
fd2c3ef7	261	struct Qdisc_class_hash {
6fe1c7a5 PM	262	struct hlist_head *hash;
	263	unsigned int hashsize;
	264	unsigned int hashmask;
	265	unsigned int hashelems;
	266	};
	267
	268	static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
	269	{
	270	id ^= id >> 8;
	271	id ^= id >> 4;
	272	return id & mask;
	273	}
	274
	275	static inline struct Qdisc_class_common *
	276	qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
	277	{
	278	struct Qdisc_class_common *cl;
	279	struct hlist_node *n;
	280	unsigned int h;
	281
	282	h = qdisc_class_hash(id, hash->hashmask);
	283	hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
	284	if (cl->classid == id)
	285	return cl;
	286	}
	287	return NULL;
	288	}
	289
	290	extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
	291	extern void qdisc_class_hash_insert(struct Qdisc_class_hash , struct Qdisc_class_common );
	292	extern void qdisc_class_hash_remove(struct Qdisc_class_hash , struct Qdisc_class_common );
	293	extern void qdisc_class_hash_grow(struct Qdisc , struct Qdisc_class_hash );
	294	extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
	295
e41a33e6 TG	296	extern void dev_init_scheduler(struct net_device *dev);
	297	extern void dev_shutdown(struct net_device *dev);
	298	extern void dev_activate(struct net_device *dev);
	299	extern void dev_deactivate(struct net_device *dev);
589983cd PM	300	extern struct Qdisc dev_graft_qdisc(struct netdev_queue dev_queue,
589983cd PM	301	struct Qdisc *qdisc);
e41a33e6 TG	302	extern void qdisc_reset(struct Qdisc *qdisc);
e41a33e6 TG	303	extern void qdisc_destroy(struct Qdisc *qdisc);
43effa1e	304	extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
5ce2d488	305	extern struct Qdisc qdisc_alloc(struct netdev_queue dev_queue,
bb949fbd	306	struct Qdisc_ops *ops);
e41a33e6	307	extern struct Qdisc qdisc_create_dflt(struct net_device dev,
bb949fbd	308	struct netdev_queue *dev_queue,
9f9afec4	309	struct Qdisc_ops *ops, u32 parentid);
175f9c1b JK	310	extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
175f9c1b JK	311	struct qdisc_size_table *stab);
a48b5a61	312	extern void tcf_destroy(struct tcf_proto *tp);
ff31ab56	313	extern void tcf_destroy_chain(struct tcf_proto **fl);
1da177e4	314
5aa70995 DM	315	/* Reset all TX qdiscs of a device. */
	316	static inline void qdisc_reset_all_tx(struct net_device *dev)
	317	{
e8a0464c DM	318	unsigned int i;
	319	for (i = 0; i < dev->num_tx_queues; i++)
	320	qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
5aa70995 DM	321	}
5aa70995 DM	322
3e745dd6 DM	323	/* Are all TX queues of the device empty? */
	324	static inline bool qdisc_all_tx_empty(const struct net_device *dev)
	325	{
e8a0464c DM	326	unsigned int i;
	327	for (i = 0; i < dev->num_tx_queues; i++) {
	328	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	329	const struct Qdisc *q = txq->qdisc;
3e745dd6	330
e8a0464c DM	331	if (q->q.qlen)
	332	return false;
	333	}
	334	return true;
3e745dd6 DM	335	}
3e745dd6 DM	336
6fa9864b DM	337	/* Are any of the TX qdiscs changing? */
	338	static inline bool qdisc_tx_changing(struct net_device *dev)
	339	{
e8a0464c DM	340	unsigned int i;
	341	for (i = 0; i < dev->num_tx_queues; i++) {
	342	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	343	if (txq->qdisc != txq->qdisc_sleeping)
	344	return true;
	345	}
	346	return false;
6fa9864b DM	347	}
6fa9864b DM	348
e8a0464c	349	/* Is the device using the noop qdisc on all queues? */
05297949 DM	350	static inline bool qdisc_tx_is_noop(const struct net_device *dev)
05297949 DM	351	{
e8a0464c DM	352	unsigned int i;
	353	for (i = 0; i < dev->num_tx_queues; i++) {
	354	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	355	if (txq->qdisc != &noop_qdisc)
	356	return false;
	357	}
	358	return true;
05297949 DM	359	}
05297949 DM	360
0abf77e5 JK	361	static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
0abf77e5 JK	362	{
175f9c1b	363	return qdisc_skb_cb(skb)->pkt_len;
0abf77e5 JK	364	}
0abf77e5 JK	365
c27f339a	366	/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
378a2f09 JP	367	enum net_xmit_qdisc_t {
378a2f09 JP	368	__NET_XMIT_STOLEN = 0x00010000,
c27f339a	369	__NET_XMIT_BYPASS = 0x00020000,
378a2f09 JP	370	};
378a2f09 JP	371
c27f339a	372	#ifdef CONFIG_NET_CLS_ACT
378a2f09	373	#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
378a2f09 JP	374	#else
	375	#define net_xmit_drop_count(e) (1)
	376	#endif
	377
5f86173b JK	378	static inline int qdisc_enqueue(struct sk_buff skb, struct Qdisc sch)
5f86173b JK	379	{
3a682fbd	380	#ifdef CONFIG_NET_SCHED
175f9c1b JK	381	if (sch->stab)
175f9c1b JK	382	qdisc_calculate_pkt_len(skb, sch->stab);
3a682fbd	383	#endif
5f86173b JK	384	return sch->enqueue(skb, sch);
	385	}
	386
	387	static inline int qdisc_enqueue_root(struct sk_buff skb, struct Qdisc sch)
	388	{
175f9c1b	389	qdisc_skb_cb(skb)->pkt_len = skb->len;
378a2f09	390	return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
5f86173b JK	391	}
5f86173b JK	392
bbd8a0d3 KK	393	static inline void __qdisc_update_bstats(struct Qdisc *sch, unsigned int len)
	394	{
	395	sch->bstats.bytes += len;
	396	sch->bstats.packets++;
	397	}
	398
9972b25d TG	399	static inline int __qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch,
	400	struct sk_buff_head *list)
	401	{
	402	__skb_queue_tail(list, skb);
0abf77e5	403	sch->qstats.backlog += qdisc_pkt_len(skb);
bbd8a0d3	404	__qdisc_update_bstats(sch, qdisc_pkt_len(skb));
9972b25d TG	405
	406	return NET_XMIT_SUCCESS;
	407	}
	408
	409	static inline int qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch)
	410	{
	411	return __qdisc_enqueue_tail(skb, sch, &sch->q);
	412	}
	413
	414	static inline struct sk_buff __qdisc_dequeue_head(struct Qdisc sch,
	415	struct sk_buff_head *list)
	416	{
	417	struct sk_buff *skb = __skb_dequeue(list);
	418
	419	if (likely(skb != NULL))
0abf77e5	420	sch->qstats.backlog -= qdisc_pkt_len(skb);
9972b25d TG	421
	422	return skb;
	423	}
	424
	425	static inline struct sk_buff qdisc_dequeue_head(struct Qdisc sch)
	426	{
	427	return __qdisc_dequeue_head(sch, &sch->q);
	428	}
	429
	430	static inline struct sk_buff __qdisc_dequeue_tail(struct Qdisc sch,
	431	struct sk_buff_head *list)
	432	{
	433	struct sk_buff *skb = __skb_dequeue_tail(list);
	434
	435	if (likely(skb != NULL))
0abf77e5	436	sch->qstats.backlog -= qdisc_pkt_len(skb);
9972b25d TG	437
	438	return skb;
	439	}
	440
	441	static inline struct sk_buff qdisc_dequeue_tail(struct Qdisc sch)
	442	{
	443	return __qdisc_dequeue_tail(sch, &sch->q);
	444	}
	445
48a8f519 PM	446	static inline struct sk_buff qdisc_peek_head(struct Qdisc sch)
	447	{
	448	return skb_peek(&sch->q);
	449	}
	450
77be155c JP	451	/* generic pseudo peek method for non-work-conserving qdisc */
	452	static inline struct sk_buff qdisc_peek_dequeued(struct Qdisc sch)
	453	{
	454	/* we can reuse ->gso_skb because peek isn't called for root qdiscs */
61c9eaf9	455	if (!sch->gso_skb) {
77be155c	456	sch->gso_skb = sch->dequeue(sch);
61c9eaf9 JP	457	if (sch->gso_skb)
	458	/* it's still part of the queue */
	459	sch->q.qlen++;
	460	}
77be155c JP	461
	462	return sch->gso_skb;
	463	}
	464
	465	/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
	466	static inline struct sk_buff qdisc_dequeue_peeked(struct Qdisc sch)
	467	{
	468	struct sk_buff *skb = sch->gso_skb;
	469
61c9eaf9	470	if (skb) {
77be155c	471	sch->gso_skb = NULL;
61c9eaf9 JP	472	sch->q.qlen--;
61c9eaf9 JP	473	} else {
77be155c	474	skb = sch->dequeue(sch);
61c9eaf9	475	}
77be155c JP	476
	477	return skb;
	478	}
	479
9972b25d TG	480	static inline void __qdisc_reset_queue(struct Qdisc *sch,
	481	struct sk_buff_head *list)
	482	{
	483	/*
	484	* We do not know the backlog in bytes of this list, it
	485	* is up to the caller to correct it
	486	*/
93245dd6	487	__skb_queue_purge(list);
9972b25d TG	488	}
	489
	490	static inline void qdisc_reset_queue(struct Qdisc *sch)
	491	{
	492	__qdisc_reset_queue(sch, &sch->q);
	493	sch->qstats.backlog = 0;
	494	}
	495
	496	static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
	497	struct sk_buff_head *list)
	498	{
	499	struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
	500
	501	if (likely(skb != NULL)) {
0abf77e5	502	unsigned int len = qdisc_pkt_len(skb);
9972b25d TG	503	kfree_skb(skb);
	504	return len;
	505	}
	506
	507	return 0;
	508	}
	509
	510	static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
	511	{
	512	return __qdisc_queue_drop(sch, &sch->q);
	513	}
	514
	515	static inline int qdisc_drop(struct sk_buff skb, struct Qdisc sch)
	516	{
	517	kfree_skb(skb);
	518	sch->qstats.drops++;
	519
	520	return NET_XMIT_DROP;
	521	}
	522
	523	static inline int qdisc_reshape_fail(struct sk_buff skb, struct Qdisc sch)
	524	{
	525	sch->qstats.drops++;
	526
c3bc7cff	527	#ifdef CONFIG_NET_CLS_ACT
9972b25d TG	528	if (sch->reshape_fail == NULL \|\| sch->reshape_fail(skb, sch))
	529	goto drop;
	530
	531	return NET_XMIT_SUCCESS;
	532
	533	drop:
	534	#endif
	535	kfree_skb(skb);
	536	return NET_XMIT_DROP;
	537	}
	538
e9bef55d JDB	539	/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
	540	long it will take to send a packet given its size.
	541	*/
	542	static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
	543	{
e08b0998 JDB	544	int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
	545	if (slot < 0)
	546	slot = 0;
e9bef55d JDB	547	slot >>= rtab->rate.cell_log;
	548	if (slot > 255)
	549	return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
	550	return rtab->data[slot];
	551	}
	552
12da81d1 JHS	553	#ifdef CONFIG_NET_CLS_ACT
	554	static inline struct sk_buff skb_act_clone(struct sk_buff skb, gfp_t gfp_mask)
	555	{
	556	struct sk_buff *n = skb_clone(skb, gfp_mask);
	557
	558	if (n) {
	559	n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
	560	n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
	561	n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
12da81d1 JHS	562	}
	563	return n;
	564	}
	565	#endif
	566
1da177e4	567	#endif