[deliverable/linux.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 rcu_head     rcu_head;
};

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;
	struct Qdisc *qdisc;

	for (i = 0; i < dev->num_tx_queues; i++) {
		qdisc = netdev_get_tx_queue(dev, i)->qdisc;
		if (qdisc) {
			spin_lock_bh(qdisc_lock(qdisc));
			qdisc_reset(qdisc);
			spin_unlock_bh(qdisc_lock(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 unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
					      struct sk_buff_head *list)
{
	struct sk_buff *skb = __qdisc_dequeue_head(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_head(struct Qdisc *sch)
{
	return __qdisc_queue_drop_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;
5d944c64	76	struct rcu_head rcu_head;
1da177e4 LT	77	};
1da177e4 LT	78
fd2c3ef7	79	struct Qdisc_class_ops {
1da177e4	80	/* Child qdisc manipulation */
926e61b7	81	struct netdev_queue * (select_queue)(struct Qdisc , struct tcmsg *);
1da177e4 LT	82	int (graft)(struct Qdisc , unsigned long cl,
	83	struct Qdisc , struct Qdisc *);
	84	struct Qdisc * (leaf)(struct Qdisc , unsigned long cl);
43effa1e	85	void (qlen_notify)(struct Qdisc , unsigned long);
1da177e4 LT	86
	87	/* Class manipulation routines */
	88	unsigned long (get)(struct Qdisc , u32 classid);
	89	void (put)(struct Qdisc , unsigned long);
	90	int (change)(struct Qdisc , u32, u32,
1e90474c	91	struct nlattr *, unsigned long );
1da177e4 LT	92	int (delete)(struct Qdisc , unsigned long);
	93	void (walk)(struct Qdisc , struct qdisc_walker * arg);
	94
	95	/* Filter manipulation */
	96	struct tcf_proto ** (tcf_chain)(struct Qdisc , unsigned long);
	97	unsigned long (bind_tcf)(struct Qdisc , unsigned long,
	98	u32 classid);
	99	void (unbind_tcf)(struct Qdisc , unsigned long);
	100
	101	/* rtnetlink specific */
	102	int (dump)(struct Qdisc , unsigned long,
	103	struct sk_buff skb, struct tcmsg);
	104	int (dump_stats)(struct Qdisc , unsigned long,
	105	struct gnet_dump *);
	106	};
	107
fd2c3ef7	108	struct Qdisc_ops {
1da177e4	109	struct Qdisc_ops *next;
20fea08b	110	const struct Qdisc_class_ops *cl_ops;
1da177e4 LT	111	char id[IFNAMSIZ];
	112	int priv_size;
	113
	114	int (enqueue)(struct sk_buff , struct Qdisc *);
	115	struct sk_buff * (dequeue)(struct Qdisc );
90d841fd	116	struct sk_buff * (peek)(struct Qdisc );
1da177e4 LT	117	unsigned int (drop)(struct Qdisc );
1da177e4 LT	118
1e90474c	119	int (init)(struct Qdisc , struct nlattr *arg);
1da177e4 LT	120	void (reset)(struct Qdisc );
1da177e4 LT	121	void (destroy)(struct Qdisc );
1e90474c	122	int (change)(struct Qdisc , struct nlattr *arg);
6ec1c69a	123	void (attach)(struct Qdisc );
1da177e4 LT	124
	125	int (dump)(struct Qdisc , struct sk_buff *);
	126	int (dump_stats)(struct Qdisc , struct gnet_dump *);
	127
	128	struct module *owner;
	129	};
	130
	131
fd2c3ef7	132	struct tcf_result {
1da177e4 LT	133	unsigned long class;
	134	u32 classid;
	135	};
	136
fd2c3ef7	137	struct tcf_proto_ops {
1da177e4 LT	138	struct tcf_proto_ops *next;
	139	char kind[IFNAMSIZ];
	140
	141	int (classify)(struct sk_buff, struct tcf_proto*,
	142	struct tcf_result *);
	143	int (init)(struct tcf_proto);
	144	void (destroy)(struct tcf_proto);
	145
	146	unsigned long (get)(struct tcf_proto, u32 handle);
	147	void (put)(struct tcf_proto, unsigned long);
	148	int (change)(struct tcf_proto, unsigned long,
add93b61	149	u32 handle, struct nlattr **,
1da177e4 LT	150	unsigned long *);
	151	int (delete)(struct tcf_proto, unsigned long);
	152	void (walk)(struct tcf_proto, struct tcf_walker *arg);
	153
	154	/* rtnetlink specific */
	155	int (dump)(struct tcf_proto, unsigned long,
	156	struct sk_buff skb, struct tcmsg);
	157
	158	struct module *owner;
	159	};
	160
fd2c3ef7	161	struct tcf_proto {
1da177e4 LT	162	/* Fast access part */
	163	struct tcf_proto *next;
	164	void *root;
	165	int (classify)(struct sk_buff, struct tcf_proto*,
	166	struct tcf_result *);
66c6f529	167	__be16 protocol;
1da177e4 LT	168
	169	/* All the rest */
	170	u32 prio;
	171	u32 classid;
	172	struct Qdisc *q;
	173	void *data;
	174	struct tcf_proto_ops *ops;
	175	};
	176
175f9c1b JK	177	struct qdisc_skb_cb {
	178	unsigned int pkt_len;
	179	char data[];
	180	};
	181
bbd8a0d3 KK	182	static inline int qdisc_qlen(struct Qdisc *q)
	183	{
	184	return q->q.qlen;
	185	}
	186
175f9c1b JK	187	static inline struct qdisc_skb_cb qdisc_skb_cb(struct sk_buff skb)
	188	{
	189	return (struct qdisc_skb_cb *)skb->cb;
	190	}
	191
83874000 DM	192	static inline spinlock_t qdisc_lock(struct Qdisc qdisc)
	193	{
	194	return &qdisc->q.lock;
	195	}
	196
7698b4fc DM	197	static inline struct Qdisc qdisc_root(struct Qdisc qdisc)
	198	{
	199	return qdisc->dev_queue->qdisc;
	200	}
	201
2540e051 JP	202	static inline struct Qdisc qdisc_root_sleeping(struct Qdisc qdisc)
	203	{
	204	return qdisc->dev_queue->qdisc_sleeping;
	205	}
	206
7e43f112 DM	207	/* The qdisc root lock is a mechanism by which to top level
	208	* of a qdisc tree can be locked from any qdisc node in the
	209	* forest. This allows changing the configuration of some
	210	* aspect of the qdisc tree while blocking out asynchronous
	211	* qdisc access in the packet processing paths.
	212	*
	213	* It is only legal to do this when the root will not change
	214	* on us. Otherwise we'll potentially lock the wrong qdisc
	215	* root. This is enforced by holding the RTNL semaphore, which
	216	* all users of this lock accessor must do.
	217	*/
7698b4fc DM	218	static inline spinlock_t qdisc_root_lock(struct Qdisc qdisc)
	219	{
	220	struct Qdisc *root = qdisc_root(qdisc);
	221
7e43f112	222	ASSERT_RTNL();
83874000	223	return qdisc_lock(root);
7698b4fc DM	224	}
7698b4fc DM	225
f6f9b93f JP	226	static inline spinlock_t qdisc_root_sleeping_lock(struct Qdisc qdisc)
	227	{
	228	struct Qdisc *root = qdisc_root_sleeping(qdisc);
	229
	230	ASSERT_RTNL();
	231	return qdisc_lock(root);
	232	}
	233
5ce2d488 DM	234	static inline struct net_device qdisc_dev(struct Qdisc qdisc)
	235	{
	236	return qdisc->dev_queue->dev;
	237	}
1da177e4	238
78a5b30b DM	239	static inline void sch_tree_lock(struct Qdisc *q)
78a5b30b DM	240	{
fe439dd0	241	spin_lock_bh(qdisc_root_sleeping_lock(q));
78a5b30b DM	242	}
	243
	244	static inline void sch_tree_unlock(struct Qdisc *q)
	245	{
fe439dd0	246	spin_unlock_bh(qdisc_root_sleeping_lock(q));
78a5b30b DM	247	}
	248
	249	#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
	250	#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
1da177e4	251
e41a33e6 TG	252	extern struct Qdisc noop_qdisc;
e41a33e6 TG	253	extern struct Qdisc_ops noop_qdisc_ops;
6ec1c69a DM	254	extern struct Qdisc_ops pfifo_fast_ops;
6ec1c69a DM	255	extern struct Qdisc_ops mq_qdisc_ops;
e41a33e6	256
fd2c3ef7	257	struct Qdisc_class_common {
6fe1c7a5 PM	258	u32 classid;
	259	struct hlist_node hnode;
	260	};
	261
fd2c3ef7	262	struct Qdisc_class_hash {
6fe1c7a5 PM	263	struct hlist_head *hash;
	264	unsigned int hashsize;
	265	unsigned int hashmask;
	266	unsigned int hashelems;
	267	};
	268
	269	static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
	270	{
	271	id ^= id >> 8;
	272	id ^= id >> 4;
	273	return id & mask;
	274	}
	275
	276	static inline struct Qdisc_class_common *
	277	qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
	278	{
	279	struct Qdisc_class_common *cl;
	280	struct hlist_node *n;
	281	unsigned int h;
	282
	283	h = qdisc_class_hash(id, hash->hashmask);
	284	hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
	285	if (cl->classid == id)
	286	return cl;
	287	}
	288	return NULL;
	289	}
	290
	291	extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
	292	extern void qdisc_class_hash_insert(struct Qdisc_class_hash , struct Qdisc_class_common );
	293	extern void qdisc_class_hash_remove(struct Qdisc_class_hash , struct Qdisc_class_common );
	294	extern void qdisc_class_hash_grow(struct Qdisc , struct Qdisc_class_hash );
	295	extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
	296
e41a33e6 TG	297	extern void dev_init_scheduler(struct net_device *dev);
	298	extern void dev_shutdown(struct net_device *dev);
	299	extern void dev_activate(struct net_device *dev);
	300	extern void dev_deactivate(struct net_device *dev);
589983cd PM	301	extern struct Qdisc dev_graft_qdisc(struct netdev_queue dev_queue,
589983cd PM	302	struct Qdisc *qdisc);
e41a33e6 TG	303	extern void qdisc_reset(struct Qdisc *qdisc);
e41a33e6 TG	304	extern void qdisc_destroy(struct Qdisc *qdisc);
43effa1e	305	extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
5ce2d488	306	extern struct Qdisc qdisc_alloc(struct netdev_queue dev_queue,
bb949fbd	307	struct Qdisc_ops *ops);
e41a33e6	308	extern struct Qdisc qdisc_create_dflt(struct net_device dev,
bb949fbd	309	struct netdev_queue *dev_queue,
9f9afec4	310	struct Qdisc_ops *ops, u32 parentid);
175f9c1b JK	311	extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
175f9c1b JK	312	struct qdisc_size_table *stab);
a48b5a61	313	extern void tcf_destroy(struct tcf_proto *tp);
ff31ab56	314	extern void tcf_destroy_chain(struct tcf_proto **fl);
1da177e4	315
5aa70995 DM	316	/* Reset all TX qdiscs of a device. */
	317	static inline void qdisc_reset_all_tx(struct net_device *dev)
	318	{
e8a0464c	319	unsigned int i;
4ef6acff JF	320	struct Qdisc *qdisc;
	321
	322	for (i = 0; i < dev->num_tx_queues; i++) {
	323	qdisc = netdev_get_tx_queue(dev, i)->qdisc;
	324	if (qdisc) {
	325	spin_lock_bh(qdisc_lock(qdisc));
	326	qdisc_reset(qdisc);
	327	spin_unlock_bh(qdisc_lock(qdisc));
	328	}
	329	}
5aa70995 DM	330	}
5aa70995 DM	331
3e745dd6 DM	332	/* Are all TX queues of the device empty? */
	333	static inline bool qdisc_all_tx_empty(const struct net_device *dev)
	334	{
e8a0464c DM	335	unsigned int i;
	336	for (i = 0; i < dev->num_tx_queues; i++) {
	337	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	338	const struct Qdisc *q = txq->qdisc;
3e745dd6	339
e8a0464c DM	340	if (q->q.qlen)
	341	return false;
	342	}
	343	return true;
3e745dd6 DM	344	}
3e745dd6 DM	345
6fa9864b DM	346	/* Are any of the TX qdiscs changing? */
	347	static inline bool qdisc_tx_changing(struct net_device *dev)
	348	{
e8a0464c DM	349	unsigned int i;
	350	for (i = 0; i < dev->num_tx_queues; i++) {
	351	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	352	if (txq->qdisc != txq->qdisc_sleeping)
	353	return true;
	354	}
	355	return false;
6fa9864b DM	356	}
6fa9864b DM	357
e8a0464c	358	/* Is the device using the noop qdisc on all queues? */
05297949 DM	359	static inline bool qdisc_tx_is_noop(const struct net_device *dev)
05297949 DM	360	{
e8a0464c DM	361	unsigned int i;
	362	for (i = 0; i < dev->num_tx_queues; i++) {
	363	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	364	if (txq->qdisc != &noop_qdisc)
	365	return false;
	366	}
	367	return true;
05297949 DM	368	}
05297949 DM	369
0abf77e5 JK	370	static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
0abf77e5 JK	371	{
175f9c1b	372	return qdisc_skb_cb(skb)->pkt_len;
0abf77e5 JK	373	}
0abf77e5 JK	374
c27f339a	375	/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
378a2f09 JP	376	enum net_xmit_qdisc_t {
378a2f09 JP	377	__NET_XMIT_STOLEN = 0x00010000,
c27f339a	378	__NET_XMIT_BYPASS = 0x00020000,
378a2f09 JP	379	};
378a2f09 JP	380
c27f339a	381	#ifdef CONFIG_NET_CLS_ACT
378a2f09	382	#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
378a2f09 JP	383	#else
	384	#define net_xmit_drop_count(e) (1)
	385	#endif
	386
5f86173b JK	387	static inline int qdisc_enqueue(struct sk_buff skb, struct Qdisc sch)
5f86173b JK	388	{
3a682fbd	389	#ifdef CONFIG_NET_SCHED
175f9c1b JK	390	if (sch->stab)
175f9c1b JK	391	qdisc_calculate_pkt_len(skb, sch->stab);
3a682fbd	392	#endif
5f86173b JK	393	return sch->enqueue(skb, sch);
	394	}
	395
	396	static inline int qdisc_enqueue_root(struct sk_buff skb, struct Qdisc sch)
	397	{
175f9c1b	398	qdisc_skb_cb(skb)->pkt_len = skb->len;
378a2f09	399	return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
5f86173b JK	400	}
5f86173b JK	401
bbd8a0d3 KK	402	static inline void __qdisc_update_bstats(struct Qdisc *sch, unsigned int len)
	403	{
	404	sch->bstats.bytes += len;
	405	sch->bstats.packets++;
	406	}
	407
9972b25d TG	408	static inline int __qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch,
	409	struct sk_buff_head *list)
	410	{
	411	__skb_queue_tail(list, skb);
0abf77e5	412	sch->qstats.backlog += qdisc_pkt_len(skb);
bbd8a0d3	413	__qdisc_update_bstats(sch, qdisc_pkt_len(skb));
9972b25d TG	414
	415	return NET_XMIT_SUCCESS;
	416	}
	417
	418	static inline int qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch)
	419	{
	420	return __qdisc_enqueue_tail(skb, sch, &sch->q);
	421	}
	422
	423	static inline struct sk_buff __qdisc_dequeue_head(struct Qdisc sch,
	424	struct sk_buff_head *list)
	425	{
	426	struct sk_buff *skb = __skb_dequeue(list);
	427
	428	if (likely(skb != NULL))
0abf77e5	429	sch->qstats.backlog -= qdisc_pkt_len(skb);
9972b25d TG	430
	431	return skb;
	432	}
	433
	434	static inline struct sk_buff qdisc_dequeue_head(struct Qdisc sch)
	435	{
	436	return __qdisc_dequeue_head(sch, &sch->q);
57dbb2d8 HPP	437	}
	438
	439	static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
	440	struct sk_buff_head *list)
	441	{
	442	struct sk_buff *skb = __qdisc_dequeue_head(sch, list);
	443
	444	if (likely(skb != NULL)) {
	445	unsigned int len = qdisc_pkt_len(skb);
	446	kfree_skb(skb);
	447	return len;
	448	}
	449
	450	return 0;
	451	}
	452
	453	static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
	454	{
	455	return __qdisc_queue_drop_head(sch, &sch->q);
9972b25d TG	456	}
	457
	458	static inline struct sk_buff __qdisc_dequeue_tail(struct Qdisc sch,
	459	struct sk_buff_head *list)
	460	{
	461	struct sk_buff *skb = __skb_dequeue_tail(list);
	462
	463	if (likely(skb != NULL))
0abf77e5	464	sch->qstats.backlog -= qdisc_pkt_len(skb);
9972b25d TG	465
	466	return skb;
	467	}
	468
	469	static inline struct sk_buff qdisc_dequeue_tail(struct Qdisc sch)
	470	{
	471	return __qdisc_dequeue_tail(sch, &sch->q);
	472	}
	473
48a8f519 PM	474	static inline struct sk_buff qdisc_peek_head(struct Qdisc sch)
	475	{
	476	return skb_peek(&sch->q);
	477	}
	478
77be155c JP	479	/* generic pseudo peek method for non-work-conserving qdisc */
	480	static inline struct sk_buff qdisc_peek_dequeued(struct Qdisc sch)
	481	{
	482	/* we can reuse ->gso_skb because peek isn't called for root qdiscs */
61c9eaf9	483	if (!sch->gso_skb) {
77be155c	484	sch->gso_skb = sch->dequeue(sch);
61c9eaf9 JP	485	if (sch->gso_skb)
	486	/* it's still part of the queue */
	487	sch->q.qlen++;
	488	}
77be155c JP	489
	490	return sch->gso_skb;
	491	}
	492
	493	/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
	494	static inline struct sk_buff qdisc_dequeue_peeked(struct Qdisc sch)
	495	{
	496	struct sk_buff *skb = sch->gso_skb;
	497
61c9eaf9	498	if (skb) {
77be155c	499	sch->gso_skb = NULL;
61c9eaf9 JP	500	sch->q.qlen--;
61c9eaf9 JP	501	} else {
77be155c	502	skb = sch->dequeue(sch);
61c9eaf9	503	}
77be155c JP	504
	505	return skb;
	506	}
	507
9972b25d TG	508	static inline void __qdisc_reset_queue(struct Qdisc *sch,
	509	struct sk_buff_head *list)
	510	{
	511	/*
	512	* We do not know the backlog in bytes of this list, it
	513	* is up to the caller to correct it
	514	*/
93245dd6	515	__skb_queue_purge(list);
9972b25d TG	516	}
	517
	518	static inline void qdisc_reset_queue(struct Qdisc *sch)
	519	{
	520	__qdisc_reset_queue(sch, &sch->q);
	521	sch->qstats.backlog = 0;
	522	}
	523
	524	static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
	525	struct sk_buff_head *list)
	526	{
	527	struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
	528
	529	if (likely(skb != NULL)) {
0abf77e5	530	unsigned int len = qdisc_pkt_len(skb);
9972b25d TG	531	kfree_skb(skb);
	532	return len;
	533	}
	534
	535	return 0;
	536	}
	537
	538	static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
	539	{
	540	return __qdisc_queue_drop(sch, &sch->q);
	541	}
	542
	543	static inline int qdisc_drop(struct sk_buff skb, struct Qdisc sch)
	544	{
	545	kfree_skb(skb);
	546	sch->qstats.drops++;
	547
	548	return NET_XMIT_DROP;
	549	}
	550
	551	static inline int qdisc_reshape_fail(struct sk_buff skb, struct Qdisc sch)
	552	{
	553	sch->qstats.drops++;
	554
c3bc7cff	555	#ifdef CONFIG_NET_CLS_ACT
9972b25d TG	556	if (sch->reshape_fail == NULL \|\| sch->reshape_fail(skb, sch))
	557	goto drop;
	558
	559	return NET_XMIT_SUCCESS;
	560
	561	drop:
	562	#endif
	563	kfree_skb(skb);
	564	return NET_XMIT_DROP;
	565	}
	566
e9bef55d JDB	567	/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
	568	long it will take to send a packet given its size.
	569	*/
	570	static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
	571	{
e08b0998 JDB	572	int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
	573	if (slot < 0)
	574	slot = 0;
e9bef55d JDB	575	slot >>= rtab->rate.cell_log;
	576	if (slot > 255)
	577	return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
	578	return rtab->data[slot];
	579	}
	580
12da81d1 JHS	581	#ifdef CONFIG_NET_CLS_ACT
	582	static inline struct sk_buff skb_act_clone(struct sk_buff skb, gfp_t gfp_mask)
	583	{
	584	struct sk_buff *n = skb_clone(skb, gfp_mask);
	585
	586	if (n) {
	587	n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
	588	n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
	589	n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
12da81d1 JHS	590	}
	591	return n;
	592	}
	593	#endif
	594
1da177e4	595	#endif