[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;
	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 bstats;
	struct gnet_stats_queue	qstats;
};

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