[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_WARN_NONWC	(1 << 16)
	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	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 *);
	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 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
	18	struct qdisc_rate_table
	19	{
	20	struct tc_ratespec rate;
	21	u32 data[256];
	22	struct qdisc_rate_table *next;
	23	int refcnt;
	24	};
	25
e2627c8c DM	26	enum qdisc_state_t
	27	{
	28	__QDISC_STATE_RUNNING,
37437bb2	29	__QDISC_STATE_SCHED,
a9312ae8	30	__QDISC_STATE_DEACTIVATED,
e2627c8c DM	31	};
e2627c8c DM	32
175f9c1b JK	33	struct qdisc_size_table {
	34	struct list_head list;
	35	struct tc_sizespec szopts;
	36	int refcnt;
	37	u16 data[];
	38	};
	39
1da177e4 LT	40	struct Qdisc
	41	{
	42	int (enqueue)(struct sk_buff skb, struct Qdisc *dev);
	43	struct sk_buff * (dequeue)(struct Qdisc dev);
	44	unsigned flags;
b00355db JP	45	#define TCQ_F_BUILTIN 1
	46	#define TCQ_F_THROTTLED 2
	47	#define TCQ_F_INGRESS 4
	48	#define TCQ_F_WARN_NONWC (1 << 16)
1da177e4 LT	49	int padded;
1da177e4 LT	50	struct Qdisc_ops *ops;
175f9c1b	51	struct qdisc_size_table *stab;
1da177e4 LT	52	u32 handle;
	53	u32 parent;
	54	atomic_t refcnt;
e2627c8c	55	unsigned long state;
554794de	56	struct sk_buff *gso_skb;
1da177e4	57	struct sk_buff_head q;
bb949fbd	58	struct netdev_queue *dev_queue;
37437bb2	59	struct Qdisc *next_sched;
1da177e4 LT	60	struct list_head list;
	61
	62	struct gnet_stats_basic bstats;
	63	struct gnet_stats_queue qstats;
	64	struct gnet_stats_rate_est rate_est;
1da177e4 LT	65	int (reshape_fail)(struct sk_buff skb,
	66	struct Qdisc *q);
	67
72b25a91 DM	68	void *u32_node;
72b25a91 DM	69
1da177e4 LT	70	/* This field is deprecated, but it is still used by CBQ
	71	* and it will live until better solution will be invented.
	72	*/
	73	struct Qdisc *__parent;
	74	};
	75
	76	struct Qdisc_class_ops
	77	{
	78	/* Child qdisc manipulation */
	79	int (graft)(struct Qdisc , unsigned long cl,
	80	struct Qdisc , struct Qdisc *);
	81	struct Qdisc * (leaf)(struct Qdisc , unsigned long cl);
43effa1e	82	void (qlen_notify)(struct Qdisc , unsigned long);
1da177e4 LT	83
	84	/* Class manipulation routines */
	85	unsigned long (get)(struct Qdisc , u32 classid);
	86	void (put)(struct Qdisc , unsigned long);
	87	int (change)(struct Qdisc , u32, u32,
1e90474c	88	struct nlattr *, unsigned long );
1da177e4 LT	89	int (delete)(struct Qdisc , unsigned long);
	90	void (walk)(struct Qdisc , struct qdisc_walker * arg);
	91
	92	/* Filter manipulation */
	93	struct tcf_proto ** (tcf_chain)(struct Qdisc , unsigned long);
	94	unsigned long (bind_tcf)(struct Qdisc , unsigned long,
	95	u32 classid);
	96	void (unbind_tcf)(struct Qdisc , unsigned long);
	97
	98	/* rtnetlink specific */
	99	int (dump)(struct Qdisc , unsigned long,
	100	struct sk_buff skb, struct tcmsg);
	101	int (dump_stats)(struct Qdisc , unsigned long,
	102	struct gnet_dump *);
	103	};
	104
	105	struct Qdisc_ops
	106	{
	107	struct Qdisc_ops *next;
20fea08b	108	const struct Qdisc_class_ops *cl_ops;
1da177e4 LT	109	char id[IFNAMSIZ];
	110	int priv_size;
	111
	112	int (enqueue)(struct sk_buff , struct Qdisc *);
	113	struct sk_buff * (dequeue)(struct Qdisc );
90d841fd	114	struct sk_buff * (peek)(struct Qdisc );
1da177e4 LT	115	unsigned int (drop)(struct Qdisc );
1da177e4 LT	116
1e90474c	117	int (init)(struct Qdisc , struct nlattr *arg);
1da177e4 LT	118	void (reset)(struct Qdisc );
1da177e4 LT	119	void (destroy)(struct Qdisc );
1e90474c	120	int (change)(struct Qdisc , struct nlattr *arg);
1da177e4 LT	121
	122	int (dump)(struct Qdisc , struct sk_buff *);
	123	int (dump_stats)(struct Qdisc , struct gnet_dump *);
	124
	125	struct module *owner;
	126	};
	127
	128
	129	struct tcf_result
	130	{
	131	unsigned long class;
	132	u32 classid;
	133	};
	134
	135	struct tcf_proto_ops
	136	{
	137	struct tcf_proto_ops *next;
	138	char kind[IFNAMSIZ];
	139
	140	int (classify)(struct sk_buff, struct tcf_proto*,
	141	struct tcf_result *);
	142	int (init)(struct tcf_proto);
	143	void (destroy)(struct tcf_proto);
	144
	145	unsigned long (get)(struct tcf_proto, u32 handle);
	146	void (put)(struct tcf_proto, unsigned long);
	147	int (change)(struct tcf_proto, unsigned long,
add93b61	148	u32 handle, struct nlattr **,
1da177e4 LT	149	unsigned long *);
	150	int (delete)(struct tcf_proto, unsigned long);
	151	void (walk)(struct tcf_proto, struct tcf_walker *arg);
	152
	153	/* rtnetlink specific */
	154	int (dump)(struct tcf_proto, unsigned long,
	155	struct sk_buff skb, struct tcmsg);
	156
	157	struct module *owner;
	158	};
	159
	160	struct tcf_proto
	161	{
	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
	182	static inline struct qdisc_skb_cb qdisc_skb_cb(struct sk_buff skb)
	183	{
	184	return (struct qdisc_skb_cb *)skb->cb;
	185	}
	186
83874000 DM	187	static inline spinlock_t qdisc_lock(struct Qdisc qdisc)
	188	{
	189	return &qdisc->q.lock;
	190	}
	191
7698b4fc DM	192	static inline struct Qdisc qdisc_root(struct Qdisc qdisc)
	193	{
	194	return qdisc->dev_queue->qdisc;
	195	}
	196
2540e051 JP	197	static inline struct Qdisc qdisc_root_sleeping(struct Qdisc qdisc)
	198	{
	199	return qdisc->dev_queue->qdisc_sleeping;
	200	}
	201
7e43f112 DM	202	/* The qdisc root lock is a mechanism by which to top level
	203	* of a qdisc tree can be locked from any qdisc node in the
	204	* forest. This allows changing the configuration of some
	205	* aspect of the qdisc tree while blocking out asynchronous
	206	* qdisc access in the packet processing paths.
	207	*
	208	* It is only legal to do this when the root will not change
	209	* on us. Otherwise we'll potentially lock the wrong qdisc
	210	* root. This is enforced by holding the RTNL semaphore, which
	211	* all users of this lock accessor must do.
	212	*/
7698b4fc DM	213	static inline spinlock_t qdisc_root_lock(struct Qdisc qdisc)
	214	{
	215	struct Qdisc *root = qdisc_root(qdisc);
	216
7e43f112	217	ASSERT_RTNL();
83874000	218	return qdisc_lock(root);
7698b4fc DM	219	}
7698b4fc DM	220
f6f9b93f JP	221	static inline spinlock_t qdisc_root_sleeping_lock(struct Qdisc qdisc)
	222	{
	223	struct Qdisc *root = qdisc_root_sleeping(qdisc);
	224
	225	ASSERT_RTNL();
	226	return qdisc_lock(root);
	227	}
	228
5ce2d488 DM	229	static inline struct net_device qdisc_dev(struct Qdisc qdisc)
	230	{
	231	return qdisc->dev_queue->dev;
	232	}
1da177e4	233
78a5b30b DM	234	static inline void sch_tree_lock(struct Qdisc *q)
78a5b30b DM	235	{
fe439dd0	236	spin_lock_bh(qdisc_root_sleeping_lock(q));
78a5b30b DM	237	}
	238
	239	static inline void sch_tree_unlock(struct Qdisc *q)
	240	{
fe439dd0	241	spin_unlock_bh(qdisc_root_sleeping_lock(q));
78a5b30b DM	242	}
	243
	244	#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
	245	#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
1da177e4	246
e41a33e6 TG	247	extern struct Qdisc noop_qdisc;
	248	extern struct Qdisc_ops noop_qdisc_ops;
	249
6fe1c7a5 PM	250	struct Qdisc_class_common
	251	{
	252	u32 classid;
	253	struct hlist_node hnode;
	254	};
	255
	256	struct Qdisc_class_hash
	257	{
	258	struct hlist_head *hash;
	259	unsigned int hashsize;
	260	unsigned int hashmask;
	261	unsigned int hashelems;
	262	};
	263
	264	static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
	265	{
	266	id ^= id >> 8;
	267	id ^= id >> 4;
	268	return id & mask;
	269	}
	270
	271	static inline struct Qdisc_class_common *
	272	qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
	273	{
	274	struct Qdisc_class_common *cl;
	275	struct hlist_node *n;
	276	unsigned int h;
	277
	278	h = qdisc_class_hash(id, hash->hashmask);
	279	hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
	280	if (cl->classid == id)
	281	return cl;
	282	}
	283	return NULL;
	284	}
	285
	286	extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
	287	extern void qdisc_class_hash_insert(struct Qdisc_class_hash , struct Qdisc_class_common );
	288	extern void qdisc_class_hash_remove(struct Qdisc_class_hash , struct Qdisc_class_common );
	289	extern void qdisc_class_hash_grow(struct Qdisc , struct Qdisc_class_hash );
	290	extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
	291
e41a33e6 TG	292	extern void dev_init_scheduler(struct net_device *dev);
	293	extern void dev_shutdown(struct net_device *dev);
	294	extern void dev_activate(struct net_device *dev);
	295	extern void dev_deactivate(struct net_device *dev);
	296	extern void qdisc_reset(struct Qdisc *qdisc);
	297	extern void qdisc_destroy(struct Qdisc *qdisc);
43effa1e	298	extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
5ce2d488	299	extern struct Qdisc qdisc_alloc(struct netdev_queue dev_queue,
bb949fbd	300	struct Qdisc_ops *ops);
e41a33e6	301	extern struct Qdisc qdisc_create_dflt(struct net_device dev,
bb949fbd	302	struct netdev_queue *dev_queue,
9f9afec4	303	struct Qdisc_ops *ops, u32 parentid);
175f9c1b JK	304	extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
175f9c1b JK	305	struct qdisc_size_table *stab);
a48b5a61	306	extern void tcf_destroy(struct tcf_proto *tp);
ff31ab56	307	extern void tcf_destroy_chain(struct tcf_proto **fl);
1da177e4	308
5aa70995 DM	309	/* Reset all TX qdiscs of a device. */
	310	static inline void qdisc_reset_all_tx(struct net_device *dev)
	311	{
e8a0464c DM	312	unsigned int i;
	313	for (i = 0; i < dev->num_tx_queues; i++)
	314	qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
5aa70995 DM	315	}
5aa70995 DM	316
3e745dd6 DM	317	/* Are all TX queues of the device empty? */
	318	static inline bool qdisc_all_tx_empty(const struct net_device *dev)
	319	{
e8a0464c DM	320	unsigned int i;
	321	for (i = 0; i < dev->num_tx_queues; i++) {
	322	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	323	const struct Qdisc *q = txq->qdisc;
3e745dd6	324
e8a0464c DM	325	if (q->q.qlen)
	326	return false;
	327	}
	328	return true;
3e745dd6 DM	329	}
3e745dd6 DM	330
6fa9864b DM	331	/* Are any of the TX qdiscs changing? */
	332	static inline bool qdisc_tx_changing(struct net_device *dev)
	333	{
e8a0464c DM	334	unsigned int i;
	335	for (i = 0; i < dev->num_tx_queues; i++) {
	336	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	337	if (txq->qdisc != txq->qdisc_sleeping)
	338	return true;
	339	}
	340	return false;
6fa9864b DM	341	}
6fa9864b DM	342
e8a0464c	343	/* Is the device using the noop qdisc on all queues? */
05297949 DM	344	static inline bool qdisc_tx_is_noop(const struct net_device *dev)
05297949 DM	345	{
e8a0464c DM	346	unsigned int i;
	347	for (i = 0; i < dev->num_tx_queues; i++) {
	348	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	349	if (txq->qdisc != &noop_qdisc)
	350	return false;
	351	}
	352	return true;
05297949 DM	353	}
05297949 DM	354
0abf77e5 JK	355	static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
0abf77e5 JK	356	{
175f9c1b	357	return qdisc_skb_cb(skb)->pkt_len;
0abf77e5 JK	358	}
0abf77e5 JK	359
c27f339a	360	/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
378a2f09 JP	361	enum net_xmit_qdisc_t {
378a2f09 JP	362	__NET_XMIT_STOLEN = 0x00010000,
c27f339a	363	__NET_XMIT_BYPASS = 0x00020000,
378a2f09 JP	364	};
378a2f09 JP	365
c27f339a	366	#ifdef CONFIG_NET_CLS_ACT
378a2f09	367	#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
378a2f09 JP	368	#else
	369	#define net_xmit_drop_count(e) (1)
	370	#endif
	371
5f86173b JK	372	static inline int qdisc_enqueue(struct sk_buff skb, struct Qdisc sch)
5f86173b JK	373	{
3a682fbd	374	#ifdef CONFIG_NET_SCHED
175f9c1b JK	375	if (sch->stab)
175f9c1b JK	376	qdisc_calculate_pkt_len(skb, sch->stab);
3a682fbd	377	#endif
5f86173b JK	378	return sch->enqueue(skb, sch);
	379	}
	380
	381	static inline int qdisc_enqueue_root(struct sk_buff skb, struct Qdisc sch)
	382	{
175f9c1b	383	qdisc_skb_cb(skb)->pkt_len = skb->len;
378a2f09	384	return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
5f86173b JK	385	}
5f86173b JK	386
9972b25d TG	387	static inline int __qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch,
	388	struct sk_buff_head *list)
	389	{
	390	__skb_queue_tail(list, skb);
0abf77e5 JK	391	sch->qstats.backlog += qdisc_pkt_len(skb);
0abf77e5 JK	392	sch->bstats.bytes += qdisc_pkt_len(skb);
9972b25d TG	393	sch->bstats.packets++;
	394
	395	return NET_XMIT_SUCCESS;
	396	}
	397
	398	static inline int qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch)
	399	{
	400	return __qdisc_enqueue_tail(skb, sch, &sch->q);
	401	}
	402
	403	static inline struct sk_buff __qdisc_dequeue_head(struct Qdisc sch,
	404	struct sk_buff_head *list)
	405	{
	406	struct sk_buff *skb = __skb_dequeue(list);
	407
	408	if (likely(skb != NULL))
0abf77e5	409	sch->qstats.backlog -= qdisc_pkt_len(skb);
9972b25d TG	410
	411	return skb;
	412	}
	413
	414	static inline struct sk_buff qdisc_dequeue_head(struct Qdisc sch)
	415	{
	416	return __qdisc_dequeue_head(sch, &sch->q);
	417	}
	418
	419	static inline struct sk_buff __qdisc_dequeue_tail(struct Qdisc sch,
	420	struct sk_buff_head *list)
	421	{
	422	struct sk_buff *skb = __skb_dequeue_tail(list);
	423
	424	if (likely(skb != NULL))
0abf77e5	425	sch->qstats.backlog -= qdisc_pkt_len(skb);
9972b25d TG	426
	427	return skb;
	428	}
	429
	430	static inline struct sk_buff qdisc_dequeue_tail(struct Qdisc sch)
	431	{
	432	return __qdisc_dequeue_tail(sch, &sch->q);
	433	}
	434
48a8f519 PM	435	static inline struct sk_buff qdisc_peek_head(struct Qdisc sch)
	436	{
	437	return skb_peek(&sch->q);
	438	}
	439
77be155c JP	440	/* generic pseudo peek method for non-work-conserving qdisc */
	441	static inline struct sk_buff qdisc_peek_dequeued(struct Qdisc sch)
	442	{
	443	/* we can reuse ->gso_skb because peek isn't called for root qdiscs */
61c9eaf9	444	if (!sch->gso_skb) {
77be155c	445	sch->gso_skb = sch->dequeue(sch);
61c9eaf9 JP	446	if (sch->gso_skb)
	447	/* it's still part of the queue */
	448	sch->q.qlen++;
	449	}
77be155c JP	450
	451	return sch->gso_skb;
	452	}
	453
	454	/* use instead of qdisc->dequeue() for all qdiscs queried with ->peek() */
	455	static inline struct sk_buff qdisc_dequeue_peeked(struct Qdisc sch)
	456	{
	457	struct sk_buff *skb = sch->gso_skb;
	458
61c9eaf9	459	if (skb) {
77be155c	460	sch->gso_skb = NULL;
61c9eaf9 JP	461	sch->q.qlen--;
61c9eaf9 JP	462	} else {
77be155c	463	skb = sch->dequeue(sch);
61c9eaf9	464	}
77be155c JP	465
	466	return skb;
	467	}
	468
9972b25d TG	469	static inline void __qdisc_reset_queue(struct Qdisc *sch,
	470	struct sk_buff_head *list)
	471	{
	472	/*
	473	* We do not know the backlog in bytes of this list, it
	474	* is up to the caller to correct it
	475	*/
93245dd6	476	__skb_queue_purge(list);
9972b25d TG	477	}
	478
	479	static inline void qdisc_reset_queue(struct Qdisc *sch)
	480	{
	481	__qdisc_reset_queue(sch, &sch->q);
	482	sch->qstats.backlog = 0;
	483	}
	484
	485	static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
	486	struct sk_buff_head *list)
	487	{
	488	struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
	489
	490	if (likely(skb != NULL)) {
0abf77e5	491	unsigned int len = qdisc_pkt_len(skb);
9972b25d TG	492	kfree_skb(skb);
	493	return len;
	494	}
	495
	496	return 0;
	497	}
	498
	499	static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
	500	{
	501	return __qdisc_queue_drop(sch, &sch->q);
	502	}
	503
	504	static inline int qdisc_drop(struct sk_buff skb, struct Qdisc sch)
	505	{
	506	kfree_skb(skb);
	507	sch->qstats.drops++;
	508
	509	return NET_XMIT_DROP;
	510	}
	511
	512	static inline int qdisc_reshape_fail(struct sk_buff skb, struct Qdisc sch)
	513	{
	514	sch->qstats.drops++;
	515
c3bc7cff	516	#ifdef CONFIG_NET_CLS_ACT
9972b25d TG	517	if (sch->reshape_fail == NULL \|\| sch->reshape_fail(skb, sch))
	518	goto drop;
	519
	520	return NET_XMIT_SUCCESS;
	521
	522	drop:
	523	#endif
	524	kfree_skb(skb);
	525	return NET_XMIT_DROP;
	526	}
	527
e9bef55d JDB	528	/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
	529	long it will take to send a packet given its size.
	530	*/
	531	static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
	532	{
e08b0998 JDB	533	int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
	534	if (slot < 0)
	535	slot = 0;
e9bef55d JDB	536	slot >>= rtab->rate.cell_log;
	537	if (slot > 255)
	538	return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
	539	return rtab->data[slot];
	540	}
	541
12da81d1 JHS	542	#ifdef CONFIG_NET_CLS_ACT
	543	static inline struct sk_buff skb_act_clone(struct sk_buff skb, gfp_t gfp_mask)
	544	{
	545	struct sk_buff *n = skb_clone(skb, gfp_mask);
	546
	547	if (n) {
	548	n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
	549	n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
	550	n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
12da81d1 JHS	551	}
	552	return n;
	553	}
	554	#endif
	555
1da177e4	556	#endif