[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_SCHED,
	__QDISC_STATE_DEACTIVATED,
};

/*
 * following bits are only changed while qdisc lock is held
 */
enum qdisc___state_t {
	__QDISC___STATE_RUNNING,
};

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;
	unsigned long		__state;
	struct gnet_stats_queue	qstats;
	struct rcu_head		rcu_head;
	spinlock_t		busylock;
};

static inline bool qdisc_is_running(struct Qdisc *qdisc)
{
	return test_bit(__QDISC___STATE_RUNNING, &qdisc->__state);
}

static inline bool qdisc_run_begin(struct Qdisc *qdisc)
{
	return !__test_and_set_bit(__QDISC___STATE_RUNNING, &qdisc->__state);
}

static inline void qdisc_run_end(struct Qdisc *qdisc)
{
	__clear_bit(__QDISC___STATE_RUNNING, &qdisc->__state);
}

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 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,
					    int action)
{
	struct sk_buff *n;

	if ((action == TC_ACT_STOLEN || action == TC_ACT_QUEUED) &&
	    !skb_shared(skb))
		n = skb_get(skb);
	else
		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 {
37437bb2	26	__QDISC_STATE_SCHED,
a9312ae8	27	__QDISC_STATE_DEACTIVATED,
e2627c8c DM	28	};
e2627c8c DM	29
37112105 ED	30	/*
	31	* following bits are only changed while qdisc lock is held
	32	*/
	33	enum qdisc___state_t {
	34	__QDISC___STATE_RUNNING,
	35	};
	36
175f9c1b JK	37	struct qdisc_size_table {
	38	struct list_head list;
	39	struct tc_sizespec szopts;
	40	int refcnt;
	41	u16 data[];
	42	};
	43
fd2c3ef7	44	struct Qdisc {
1da177e4 LT	45	int (enqueue)(struct sk_buff skb, struct Qdisc *dev);
	46	struct sk_buff * (dequeue)(struct Qdisc dev);
	47	unsigned flags;
b00355db JP	48	#define TCQ_F_BUILTIN 1
	49	#define TCQ_F_THROTTLED 2
	50	#define TCQ_F_INGRESS 4
bbd8a0d3	51	#define TCQ_F_CAN_BYPASS 8
23bcf634	52	#define TCQ_F_MQROOT 16
b00355db	53	#define TCQ_F_WARN_NONWC (1 << 16)
1da177e4 LT	54	int padded;
1da177e4 LT	55	struct Qdisc_ops *ops;
175f9c1b	56	struct qdisc_size_table *stab;
5e140dfc	57	struct list_head list;
1da177e4 LT	58	u32 handle;
	59	u32 parent;
	60	atomic_t refcnt;
1da177e4	61	struct gnet_stats_rate_est rate_est;
1da177e4 LT	62	int (reshape_fail)(struct sk_buff skb,
	63	struct Qdisc *q);
	64
72b25a91 DM	65	void *u32_node;
72b25a91 DM	66
1da177e4 LT	67	/* This field is deprecated, but it is still used by CBQ
	68	* and it will live until better solution will be invented.
	69	*/
	70	struct Qdisc *__parent;
5e140dfc ED	71	struct netdev_queue *dev_queue;
	72	struct Qdisc *next_sched;
	73
	74	struct sk_buff *gso_skb;
	75	/*
	76	* For performance sake on SMP, we put highly modified fields at the end
	77	*/
	78	unsigned long state;
	79	struct sk_buff_head q;
c1a8f1f1	80	struct gnet_stats_basic_packed bstats;
37112105	81	unsigned long __state;
5e140dfc	82	struct gnet_stats_queue qstats;
79640a4c ED	83	struct rcu_head rcu_head;
79640a4c ED	84	spinlock_t busylock;
1da177e4 LT	85	};
1da177e4 LT	86
bc135b23 ED	87	static inline bool qdisc_is_running(struct Qdisc *qdisc)
bc135b23 ED	88	{
37112105	89	return test_bit(__QDISC___STATE_RUNNING, &qdisc->__state);
bc135b23 ED	90	}
	91
	92	static inline bool qdisc_run_begin(struct Qdisc *qdisc)
	93	{
37112105	94	return !__test_and_set_bit(__QDISC___STATE_RUNNING, &qdisc->__state);
bc135b23 ED	95	}
	96
	97	static inline void qdisc_run_end(struct Qdisc *qdisc)
	98	{
37112105	99	__clear_bit(__QDISC___STATE_RUNNING, &qdisc->__state);
bc135b23 ED	100	}
bc135b23 ED	101
fd2c3ef7	102	struct Qdisc_class_ops {
1da177e4	103	/* Child qdisc manipulation */
926e61b7	104	struct netdev_queue * (select_queue)(struct Qdisc , struct tcmsg *);
1da177e4 LT	105	int (graft)(struct Qdisc , unsigned long cl,
	106	struct Qdisc , struct Qdisc *);
	107	struct Qdisc * (leaf)(struct Qdisc , unsigned long cl);
43effa1e	108	void (qlen_notify)(struct Qdisc , unsigned long);
1da177e4 LT	109
	110	/* Class manipulation routines */
	111	unsigned long (get)(struct Qdisc , u32 classid);
	112	void (put)(struct Qdisc , unsigned long);
	113	int (change)(struct Qdisc , u32, u32,
1e90474c	114	struct nlattr *, unsigned long );
1da177e4 LT	115	int (delete)(struct Qdisc , unsigned long);
	116	void (walk)(struct Qdisc , struct qdisc_walker * arg);
	117
	118	/* Filter manipulation */
	119	struct tcf_proto ** (tcf_chain)(struct Qdisc , unsigned long);
	120	unsigned long (bind_tcf)(struct Qdisc , unsigned long,
	121	u32 classid);
	122	void (unbind_tcf)(struct Qdisc , unsigned long);
	123
	124	/* rtnetlink specific */
	125	int (dump)(struct Qdisc , unsigned long,
	126	struct sk_buff skb, struct tcmsg);
	127	int (dump_stats)(struct Qdisc , unsigned long,
	128	struct gnet_dump *);
	129	};
	130
fd2c3ef7	131	struct Qdisc_ops {
1da177e4	132	struct Qdisc_ops *next;
20fea08b	133	const struct Qdisc_class_ops *cl_ops;
1da177e4 LT	134	char id[IFNAMSIZ];
	135	int priv_size;
	136
	137	int (enqueue)(struct sk_buff , struct Qdisc *);
	138	struct sk_buff * (dequeue)(struct Qdisc );
90d841fd	139	struct sk_buff * (peek)(struct Qdisc );
1da177e4 LT	140	unsigned int (drop)(struct Qdisc );
1da177e4 LT	141
1e90474c	142	int (init)(struct Qdisc , struct nlattr *arg);
1da177e4 LT	143	void (reset)(struct Qdisc );
1da177e4 LT	144	void (destroy)(struct Qdisc );
1e90474c	145	int (change)(struct Qdisc , struct nlattr *arg);
6ec1c69a	146	void (attach)(struct Qdisc );
1da177e4 LT	147
	148	int (dump)(struct Qdisc , struct sk_buff *);
	149	int (dump_stats)(struct Qdisc , struct gnet_dump *);
	150
	151	struct module *owner;
	152	};
	153
	154
fd2c3ef7	155	struct tcf_result {
1da177e4 LT	156	unsigned long class;
	157	u32 classid;
	158	};
	159
fd2c3ef7	160	struct tcf_proto_ops {
1da177e4 LT	161	struct tcf_proto_ops *next;
	162	char kind[IFNAMSIZ];
	163
	164	int (classify)(struct sk_buff, struct tcf_proto*,
	165	struct tcf_result *);
	166	int (init)(struct tcf_proto);
	167	void (destroy)(struct tcf_proto);
	168
	169	unsigned long (get)(struct tcf_proto, u32 handle);
	170	void (put)(struct tcf_proto, unsigned long);
	171	int (change)(struct tcf_proto, unsigned long,
add93b61	172	u32 handle, struct nlattr **,
1da177e4 LT	173	unsigned long *);
	174	int (delete)(struct tcf_proto, unsigned long);
	175	void (walk)(struct tcf_proto, struct tcf_walker *arg);
	176
	177	/* rtnetlink specific */
	178	int (dump)(struct tcf_proto, unsigned long,
	179	struct sk_buff skb, struct tcmsg);
	180
	181	struct module *owner;
	182	};
	183
fd2c3ef7	184	struct tcf_proto {
1da177e4 LT	185	/* Fast access part */
	186	struct tcf_proto *next;
	187	void *root;
	188	int (classify)(struct sk_buff, struct tcf_proto*,
	189	struct tcf_result *);
66c6f529	190	__be16 protocol;
1da177e4 LT	191
	192	/* All the rest */
	193	u32 prio;
	194	u32 classid;
	195	struct Qdisc *q;
	196	void *data;
	197	struct tcf_proto_ops *ops;
	198	};
	199
175f9c1b JK	200	struct qdisc_skb_cb {
	201	unsigned int pkt_len;
	202	char data[];
	203	};
	204
bbd8a0d3 KK	205	static inline int qdisc_qlen(struct Qdisc *q)
	206	{
	207	return q->q.qlen;
	208	}
	209
175f9c1b JK	210	static inline struct qdisc_skb_cb qdisc_skb_cb(struct sk_buff skb)
	211	{
	212	return (struct qdisc_skb_cb *)skb->cb;
	213	}
	214
83874000 DM	215	static inline spinlock_t qdisc_lock(struct Qdisc qdisc)
	216	{
	217	return &qdisc->q.lock;
	218	}
	219
7698b4fc DM	220	static inline struct Qdisc qdisc_root(struct Qdisc qdisc)
	221	{
	222	return qdisc->dev_queue->qdisc;
	223	}
	224
2540e051 JP	225	static inline struct Qdisc qdisc_root_sleeping(struct Qdisc qdisc)
	226	{
	227	return qdisc->dev_queue->qdisc_sleeping;
	228	}
	229
7e43f112 DM	230	/* The qdisc root lock is a mechanism by which to top level
	231	* of a qdisc tree can be locked from any qdisc node in the
	232	* forest. This allows changing the configuration of some
	233	* aspect of the qdisc tree while blocking out asynchronous
	234	* qdisc access in the packet processing paths.
	235	*
	236	* It is only legal to do this when the root will not change
	237	* on us. Otherwise we'll potentially lock the wrong qdisc
	238	* root. This is enforced by holding the RTNL semaphore, which
	239	* all users of this lock accessor must do.
	240	*/
7698b4fc DM	241	static inline spinlock_t qdisc_root_lock(struct Qdisc qdisc)
	242	{
	243	struct Qdisc *root = qdisc_root(qdisc);
	244
7e43f112	245	ASSERT_RTNL();
83874000	246	return qdisc_lock(root);
7698b4fc DM	247	}
7698b4fc DM	248
f6f9b93f JP	249	static inline spinlock_t qdisc_root_sleeping_lock(struct Qdisc qdisc)
	250	{
	251	struct Qdisc *root = qdisc_root_sleeping(qdisc);
	252
	253	ASSERT_RTNL();
	254	return qdisc_lock(root);
	255	}
	256
5ce2d488 DM	257	static inline struct net_device qdisc_dev(struct Qdisc qdisc)
	258	{
	259	return qdisc->dev_queue->dev;
	260	}
1da177e4	261
78a5b30b DM	262	static inline void sch_tree_lock(struct Qdisc *q)
78a5b30b DM	263	{
fe439dd0	264	spin_lock_bh(qdisc_root_sleeping_lock(q));
78a5b30b DM	265	}
	266
	267	static inline void sch_tree_unlock(struct Qdisc *q)
	268	{
fe439dd0	269	spin_unlock_bh(qdisc_root_sleeping_lock(q));
78a5b30b DM	270	}
	271
	272	#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
	273	#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
1da177e4	274
e41a33e6 TG	275	extern struct Qdisc noop_qdisc;
e41a33e6 TG	276	extern struct Qdisc_ops noop_qdisc_ops;
6ec1c69a DM	277	extern struct Qdisc_ops pfifo_fast_ops;
6ec1c69a DM	278	extern struct Qdisc_ops mq_qdisc_ops;
e41a33e6	279
fd2c3ef7	280	struct Qdisc_class_common {
6fe1c7a5 PM	281	u32 classid;
	282	struct hlist_node hnode;
	283	};
	284
fd2c3ef7	285	struct Qdisc_class_hash {
6fe1c7a5 PM	286	struct hlist_head *hash;
	287	unsigned int hashsize;
	288	unsigned int hashmask;
	289	unsigned int hashelems;
	290	};
	291
	292	static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
	293	{
	294	id ^= id >> 8;
	295	id ^= id >> 4;
	296	return id & mask;
	297	}
	298
	299	static inline struct Qdisc_class_common *
	300	qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
	301	{
	302	struct Qdisc_class_common *cl;
	303	struct hlist_node *n;
	304	unsigned int h;
	305
	306	h = qdisc_class_hash(id, hash->hashmask);
	307	hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
	308	if (cl->classid == id)
	309	return cl;
	310	}
	311	return NULL;
	312	}
	313
	314	extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
	315	extern void qdisc_class_hash_insert(struct Qdisc_class_hash , struct Qdisc_class_common );
	316	extern void qdisc_class_hash_remove(struct Qdisc_class_hash , struct Qdisc_class_common );
	317	extern void qdisc_class_hash_grow(struct Qdisc , struct Qdisc_class_hash );
	318	extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
	319
e41a33e6 TG	320	extern void dev_init_scheduler(struct net_device *dev);
	321	extern void dev_shutdown(struct net_device *dev);
	322	extern void dev_activate(struct net_device *dev);
	323	extern void dev_deactivate(struct net_device *dev);
589983cd PM	324	extern struct Qdisc dev_graft_qdisc(struct netdev_queue dev_queue,
589983cd PM	325	struct Qdisc *qdisc);
e41a33e6 TG	326	extern void qdisc_reset(struct Qdisc *qdisc);
e41a33e6 TG	327	extern void qdisc_destroy(struct Qdisc *qdisc);
43effa1e	328	extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
5ce2d488	329	extern struct Qdisc qdisc_alloc(struct netdev_queue dev_queue,
bb949fbd	330	struct Qdisc_ops *ops);
e41a33e6	331	extern struct Qdisc qdisc_create_dflt(struct net_device dev,
bb949fbd	332	struct netdev_queue *dev_queue,
9f9afec4	333	struct Qdisc_ops *ops, u32 parentid);
175f9c1b JK	334	extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
175f9c1b JK	335	struct qdisc_size_table *stab);
a48b5a61	336	extern void tcf_destroy(struct tcf_proto *tp);
ff31ab56	337	extern void tcf_destroy_chain(struct tcf_proto **fl);
1da177e4	338
5aa70995 DM	339	/* Reset all TX qdiscs of a device. */
	340	static inline void qdisc_reset_all_tx(struct net_device *dev)
	341	{
e8a0464c DM	342	unsigned int i;
	343	for (i = 0; i < dev->num_tx_queues; i++)
	344	qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
5aa70995 DM	345	}
5aa70995 DM	346
3e745dd6 DM	347	/* Are all TX queues of the device empty? */
	348	static inline bool qdisc_all_tx_empty(const struct net_device *dev)
	349	{
e8a0464c DM	350	unsigned int i;
	351	for (i = 0; i < dev->num_tx_queues; i++) {
	352	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	353	const struct Qdisc *q = txq->qdisc;
3e745dd6	354
e8a0464c DM	355	if (q->q.qlen)
	356	return false;
	357	}
	358	return true;
3e745dd6 DM	359	}
3e745dd6 DM	360
6fa9864b DM	361	/* Are any of the TX qdiscs changing? */
	362	static inline bool qdisc_tx_changing(struct net_device *dev)
	363	{
e8a0464c DM	364	unsigned int i;
	365	for (i = 0; i < dev->num_tx_queues; i++) {
	366	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	367	if (txq->qdisc != txq->qdisc_sleeping)
	368	return true;
	369	}
	370	return false;
6fa9864b DM	371	}
6fa9864b DM	372
e8a0464c	373	/* Is the device using the noop qdisc on all queues? */
05297949 DM	374	static inline bool qdisc_tx_is_noop(const struct net_device *dev)
05297949 DM	375	{
e8a0464c DM	376	unsigned int i;
	377	for (i = 0; i < dev->num_tx_queues; i++) {
	378	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	379	if (txq->qdisc != &noop_qdisc)
	380	return false;
	381	}
	382	return true;
05297949 DM	383	}
05297949 DM	384
0abf77e5 JK	385	static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
0abf77e5 JK	386	{
175f9c1b	387	return qdisc_skb_cb(skb)->pkt_len;
0abf77e5 JK	388	}
0abf77e5 JK	389
c27f339a	390	/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
378a2f09 JP	391	enum net_xmit_qdisc_t {
378a2f09 JP	392	__NET_XMIT_STOLEN = 0x00010000,
c27f339a	393	__NET_XMIT_BYPASS = 0x00020000,
378a2f09 JP	394	};
378a2f09 JP	395
c27f339a	396	#ifdef CONFIG_NET_CLS_ACT
378a2f09	397	#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
378a2f09 JP	398	#else
	399	#define net_xmit_drop_count(e) (1)
	400	#endif
	401
5f86173b JK	402	static inline int qdisc_enqueue(struct sk_buff skb, struct Qdisc sch)
5f86173b JK	403	{
3a682fbd	404	#ifdef CONFIG_NET_SCHED
175f9c1b JK	405	if (sch->stab)
175f9c1b JK	406	qdisc_calculate_pkt_len(skb, sch->stab);
3a682fbd	407	#endif
5f86173b JK	408	return sch->enqueue(skb, sch);
	409	}
	410
	411	static inline int qdisc_enqueue_root(struct sk_buff skb, struct Qdisc sch)
	412	{
175f9c1b	413	qdisc_skb_cb(skb)->pkt_len = skb->len;
378a2f09	414	return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
5f86173b JK	415	}
5f86173b JK	416
bbd8a0d3 KK	417	static inline void __qdisc_update_bstats(struct Qdisc *sch, unsigned int len)
	418	{
	419	sch->bstats.bytes += len;
	420	sch->bstats.packets++;
	421	}
	422
9972b25d TG	423	static inline int __qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch,
	424	struct sk_buff_head *list)
	425	{
	426	__skb_queue_tail(list, skb);
0abf77e5	427	sch->qstats.backlog += qdisc_pkt_len(skb);
bbd8a0d3	428	__qdisc_update_bstats(sch, qdisc_pkt_len(skb));
9972b25d TG	429
	430	return NET_XMIT_SUCCESS;
	431	}
	432
	433	static inline int qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch)
	434	{
	435	return __qdisc_enqueue_tail(skb, sch, &sch->q);
	436	}
	437
	438	static inline struct sk_buff __qdisc_dequeue_head(struct Qdisc sch,
	439	struct sk_buff_head *list)
	440	{
	441	struct sk_buff *skb = __skb_dequeue(list);
	442
	443	if (likely(skb != NULL))
0abf77e5	444	sch->qstats.backlog -= qdisc_pkt_len(skb);
9972b25d TG	445
	446	return skb;
	447	}
	448
	449	static inline struct sk_buff qdisc_dequeue_head(struct Qdisc sch)
	450	{
	451	return __qdisc_dequeue_head(sch, &sch->q);
57dbb2d8 HPP	452	}
	453
	454	static inline unsigned int __qdisc_queue_drop_head(struct Qdisc *sch,
	455	struct sk_buff_head *list)
	456	{
	457	struct sk_buff *skb = __qdisc_dequeue_head(sch, list);
	458
	459	if (likely(skb != NULL)) {
	460	unsigned int len = qdisc_pkt_len(skb);
	461	kfree_skb(skb);
	462	return len;
	463	}
	464
	465	return 0;
	466	}
	467
	468	static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
	469	{
	470	return __qdisc_queue_drop_head(sch, &sch->q);
9972b25d TG	471	}
	472
	473	static inline struct sk_buff __qdisc_dequeue_tail(struct Qdisc sch,
	474	struct sk_buff_head *list)
	475	{
	476	struct sk_buff *skb = __skb_dequeue_tail(list);
	477
	478	if (likely(skb != NULL))
0abf77e5	479	sch->qstats.backlog -= qdisc_pkt_len(skb);
9972b25d TG	480
	481	return skb;
	482	}
	483
	484	static inline struct sk_buff qdisc_dequeue_tail(struct Qdisc sch)
	485	{
	486	return __qdisc_dequeue_tail(sch, &sch->q);
	487	}
	488
48a8f519 PM	489	static inline struct sk_buff qdisc_peek_head(struct Qdisc sch)
	490	{
	491	return skb_peek(&sch->q);
	492	}
	493
77be155c JP	494	/* generic pseudo peek method for non-work-conserving qdisc */
	495	static inline struct sk_buff qdisc_peek_dequeued(struct Qdisc sch)
	496	{
	497	/* we can reuse ->gso_skb because peek isn't called for root qdiscs */
61c9eaf9	498	if (!sch->gso_skb) {
77be155c	499	sch->gso_skb = sch->dequeue(sch);
61c9eaf9 JP	500	if (sch->gso_skb)
	501	/* it's still part of the queue */
	502	sch->q.qlen++;
	503	}
77be155c JP	504
	505	return sch->gso_skb;
	506	}
	507
	508	/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
	509	static inline struct sk_buff qdisc_dequeue_peeked(struct Qdisc sch)
	510	{
	511	struct sk_buff *skb = sch->gso_skb;
	512
61c9eaf9	513	if (skb) {
77be155c	514	sch->gso_skb = NULL;
61c9eaf9 JP	515	sch->q.qlen--;
61c9eaf9 JP	516	} else {
77be155c	517	skb = sch->dequeue(sch);
61c9eaf9	518	}
77be155c JP	519
	520	return skb;
	521	}
	522
9972b25d TG	523	static inline void __qdisc_reset_queue(struct Qdisc *sch,
	524	struct sk_buff_head *list)
	525	{
	526	/*
	527	* We do not know the backlog in bytes of this list, it
	528	* is up to the caller to correct it
	529	*/
93245dd6	530	__skb_queue_purge(list);
9972b25d TG	531	}
	532
	533	static inline void qdisc_reset_queue(struct Qdisc *sch)
	534	{
	535	__qdisc_reset_queue(sch, &sch->q);
	536	sch->qstats.backlog = 0;
	537	}
	538
	539	static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
	540	struct sk_buff_head *list)
	541	{
	542	struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
	543
	544	if (likely(skb != NULL)) {
0abf77e5	545	unsigned int len = qdisc_pkt_len(skb);
9972b25d TG	546	kfree_skb(skb);
	547	return len;
	548	}
	549
	550	return 0;
	551	}
	552
	553	static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
	554	{
	555	return __qdisc_queue_drop(sch, &sch->q);
	556	}
	557
	558	static inline int qdisc_drop(struct sk_buff skb, struct Qdisc sch)
	559	{
	560	kfree_skb(skb);
	561	sch->qstats.drops++;
	562
	563	return NET_XMIT_DROP;
	564	}
	565
	566	static inline int qdisc_reshape_fail(struct sk_buff skb, struct Qdisc sch)
	567	{
	568	sch->qstats.drops++;
	569
c3bc7cff	570	#ifdef CONFIG_NET_CLS_ACT
9972b25d TG	571	if (sch->reshape_fail == NULL \|\| sch->reshape_fail(skb, sch))
	572	goto drop;
	573
	574	return NET_XMIT_SUCCESS;
	575
	576	drop:
	577	#endif
	578	kfree_skb(skb);
	579	return NET_XMIT_DROP;
	580	}
	581
e9bef55d JDB	582	/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
	583	long it will take to send a packet given its size.
	584	*/
	585	static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
	586	{
e08b0998 JDB	587	int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
	588	if (slot < 0)
	589	slot = 0;
e9bef55d JDB	590	slot >>= rtab->rate.cell_log;
	591	if (slot > 255)
	592	return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
	593	return rtab->data[slot];
	594	}
	595
12da81d1	596	#ifdef CONFIG_NET_CLS_ACT
210d6de7 CG	597	static inline struct sk_buff skb_act_clone(struct sk_buff skb, gfp_t gfp_mask,
210d6de7 CG	598	int action)
12da81d1	599	{
210d6de7 CG	600	struct sk_buff *n;
	601
	602	if ((action == TC_ACT_STOLEN \|\| action == TC_ACT_QUEUED) &&
	603	!skb_shared(skb))
	604	n = skb_get(skb);
	605	else
	606	n = skb_clone(skb, gfp_mask);
12da81d1 JHS	607
	608	if (n) {
	609	n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
	610	n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
	611	n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
12da81d1 JHS	612	}
	613	return n;
	614	}
	615	#endif
	616
1da177e4	617	#endif