include/net/sch_generic.h - maze/linux - Git at Google

 #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
 	int			padded;
 	struct Qdisc_ops	*ops;
 	struct qdisc_size_table	*stab;
 	u32			handle;
 	u32			parent;
 	atomic_t		refcnt;
 	unsigned long		state;
 	struct sk_buff		*gso_skb;
 	struct sk_buff_head	requeue;
 	struct sk_buff_head	q;
 	struct netdev_queue	*dev_queue;
 	struct Qdisc		*next_sched;
 	struct list_head	list;

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

 	void			*u32_node;

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

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

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

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

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

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

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

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

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

 	struct module		*owner;
 };


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

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

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

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

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

 	struct module		*owner;
 };

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

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

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

 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;

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

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

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

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

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

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

 extern void dev_init_scheduler(struct net_device *dev);
 extern void dev_shutdown(struct net_device *dev);
 extern void dev_activate(struct net_device *dev);
 extern void dev_deactivate(struct net_device *dev);
 extern void qdisc_reset(struct Qdisc *qdisc);
 extern void qdisc_destroy(struct Qdisc *qdisc);
 extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
 extern struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
 				 struct Qdisc_ops *ops);
 extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
 				       struct netdev_queue *dev_queue,
 				       struct Qdisc_ops *ops, u32 parentid);
 extern void 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 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);
 	sch->bstats.bytes += qdisc_pkt_len(skb);
 	sch->bstats.packets++;

 	return NET_XMIT_SUCCESS;
 }

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

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

 	if (likely(skb != NULL))
 		sch->qstats.backlog -= 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 int __qdisc_requeue(struct sk_buff *skb, struct Qdisc *sch,
 				  struct sk_buff_head *list)
 {
 	__skb_queue_head(list, skb);
 	sch->qstats.backlog += qdisc_pkt_len(skb);
 	sch->qstats.requeues++;

 	return NET_XMIT_SUCCESS;
 }

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

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

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

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

 	if (likely(skb != NULL)) {
 		unsigned int len = 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
	#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
	int padded;
	struct Qdisc_ops *ops;
	struct qdisc_size_table *stab;
	u32 handle;
	u32 parent;
	atomic_t refcnt;
	unsigned long state;
	struct sk_buff *gso_skb;
	struct sk_buff_head requeue;
	struct sk_buff_head q;
	struct netdev_queue *dev_queue;
	struct Qdisc *next_sched;
	struct list_head list;

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

	void *u32_node;

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

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

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

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

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

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

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

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

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

	struct module *owner;
	};


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

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

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

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

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

	struct module *owner;
	};

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

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

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

	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;

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

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

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

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

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

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

	extern void dev_init_scheduler(struct net_device *dev);
	extern void dev_shutdown(struct net_device *dev);
	extern void dev_activate(struct net_device *dev);
	extern void dev_deactivate(struct net_device *dev);
	extern void qdisc_reset(struct Qdisc *qdisc);
	extern void qdisc_destroy(struct Qdisc *qdisc);
	extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
	extern struct Qdisc qdisc_alloc(struct netdev_queue dev_queue,
	struct Qdisc_ops *ops);
	extern struct Qdisc qdisc_create_dflt(struct net_device dev,
	struct netdev_queue *dev_queue,
	struct Qdisc_ops *ops, u32 parentid);
	extern void 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 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);
	sch->bstats.bytes += qdisc_pkt_len(skb);
	sch->bstats.packets++;

	return NET_XMIT_SUCCESS;
	}

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

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

	if (likely(skb != NULL))
	sch->qstats.backlog -= 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 int __qdisc_requeue(struct sk_buff skb, struct Qdisc sch,
	struct sk_buff_head *list)
	{
	__skb_queue_head(list, skb);
	sch->qstats.backlog += qdisc_pkt_len(skb);
	sch->qstats.requeues++;

	return NET_XMIT_SUCCESS;
	}

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

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

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

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

	if (likely(skb != NULL)) {
	unsigned int len = 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