[mirror_ubuntu-artful-kernel.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
	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 *);
	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 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_lock(q));
}

static inline void sch_tree_unlock(struct Qdisc *q)
{
	spin_unlock_bh(qdisc_root_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 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
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;
	45	#define TCQ_F_BUILTIN 1
	46	#define TCQ_F_THROTTLED 2
	47	#define TCQ_F_INGRESS 4
	48	int padded;
	49	struct Qdisc_ops *ops;
175f9c1b	50	struct qdisc_size_table *stab;
1da177e4 LT	51	u32 handle;
	52	u32 parent;
	53	atomic_t refcnt;
e2627c8c	54	unsigned long state;
d3b753db	55	struct sk_buff *gso_skb;
1da177e4	56	struct sk_buff_head q;
bb949fbd	57	struct netdev_queue *dev_queue;
37437bb2	58	struct Qdisc *next_sched;
1da177e4 LT	59	struct list_head list;
	60
	61	struct gnet_stats_basic bstats;
	62	struct gnet_stats_queue qstats;
	63	struct gnet_stats_rate_est rate_est;
1da177e4 LT	64	int (reshape_fail)(struct sk_buff skb,
	65	struct Qdisc *q);
	66
72b25a91 DM	67	void *u32_node;
72b25a91 DM	68
1da177e4 LT	69	/* This field is deprecated, but it is still used by CBQ
	70	* and it will live until better solution will be invented.
	71	*/
	72	struct Qdisc *__parent;
	73	};
	74
	75	struct Qdisc_class_ops
	76	{
	77	/* Child qdisc manipulation */
	78	int (graft)(struct Qdisc , unsigned long cl,
	79	struct Qdisc , struct Qdisc *);
	80	struct Qdisc * (leaf)(struct Qdisc , unsigned long cl);
43effa1e	81	void (qlen_notify)(struct Qdisc , unsigned long);
1da177e4 LT	82
	83	/* Class manipulation routines */
	84	unsigned long (get)(struct Qdisc , u32 classid);
	85	void (put)(struct Qdisc , unsigned long);
	86	int (change)(struct Qdisc , u32, u32,
1e90474c	87	struct nlattr *, unsigned long );
1da177e4 LT	88	int (delete)(struct Qdisc , unsigned long);
	89	void (walk)(struct Qdisc , struct qdisc_walker * arg);
	90
	91	/* Filter manipulation */
	92	struct tcf_proto ** (tcf_chain)(struct Qdisc , unsigned long);
	93	unsigned long (bind_tcf)(struct Qdisc , unsigned long,
	94	u32 classid);
	95	void (unbind_tcf)(struct Qdisc , unsigned long);
	96
	97	/* rtnetlink specific */
	98	int (dump)(struct Qdisc , unsigned long,
	99	struct sk_buff skb, struct tcmsg);
	100	int (dump_stats)(struct Qdisc , unsigned long,
	101	struct gnet_dump *);
	102	};
	103
	104	struct Qdisc_ops
	105	{
	106	struct Qdisc_ops *next;
20fea08b	107	const struct Qdisc_class_ops *cl_ops;
1da177e4 LT	108	char id[IFNAMSIZ];
	109	int priv_size;
	110
	111	int (enqueue)(struct sk_buff , struct Qdisc *);
	112	struct sk_buff * (dequeue)(struct Qdisc );
	113	int (requeue)(struct sk_buff , struct Qdisc *);
	114	unsigned int (drop)(struct Qdisc );
	115
1e90474c	116	int (init)(struct Qdisc , struct nlattr *arg);
1da177e4 LT	117	void (reset)(struct Qdisc );
1da177e4 LT	118	void (destroy)(struct Qdisc );
1e90474c	119	int (change)(struct Qdisc , struct nlattr *arg);
1da177e4 LT	120
	121	int (dump)(struct Qdisc , struct sk_buff *);
	122	int (dump_stats)(struct Qdisc , struct gnet_dump *);
	123
	124	struct module *owner;
	125	};
	126
	127
	128	struct tcf_result
	129	{
	130	unsigned long class;
	131	u32 classid;
	132	};
	133
	134	struct tcf_proto_ops
	135	{
	136	struct tcf_proto_ops *next;
	137	char kind[IFNAMSIZ];
	138
	139	int (classify)(struct sk_buff, struct tcf_proto*,
	140	struct tcf_result *);
	141	int (init)(struct tcf_proto);
	142	void (destroy)(struct tcf_proto);
	143
	144	unsigned long (get)(struct tcf_proto, u32 handle);
	145	void (put)(struct tcf_proto, unsigned long);
	146	int (change)(struct tcf_proto, unsigned long,
add93b61	147	u32 handle, struct nlattr **,
1da177e4 LT	148	unsigned long *);
	149	int (delete)(struct tcf_proto, unsigned long);
	150	void (walk)(struct tcf_proto, struct tcf_walker *arg);
	151
	152	/* rtnetlink specific */
	153	int (dump)(struct tcf_proto, unsigned long,
	154	struct sk_buff skb, struct tcmsg);
	155
	156	struct module *owner;
	157	};
	158
	159	struct tcf_proto
	160	{
	161	/* Fast access part */
	162	struct tcf_proto *next;
	163	void *root;
	164	int (classify)(struct sk_buff, struct tcf_proto*,
	165	struct tcf_result *);
66c6f529	166	__be16 protocol;
1da177e4 LT	167
	168	/* All the rest */
	169	u32 prio;
	170	u32 classid;
	171	struct Qdisc *q;
	172	void *data;
	173	struct tcf_proto_ops *ops;
	174	};
	175
175f9c1b JK	176	struct qdisc_skb_cb {
	177	unsigned int pkt_len;
	178	char data[];
	179	};
	180
	181	static inline struct qdisc_skb_cb qdisc_skb_cb(struct sk_buff skb)
	182	{
	183	return (struct qdisc_skb_cb *)skb->cb;
	184	}
	185
83874000 DM	186	static inline spinlock_t qdisc_lock(struct Qdisc qdisc)
	187	{
	188	return &qdisc->q.lock;
	189	}
	190
7698b4fc DM	191	static inline struct Qdisc qdisc_root(struct Qdisc qdisc)
	192	{
	193	return qdisc->dev_queue->qdisc;
	194	}
	195
2540e051 JP	196	static inline struct Qdisc qdisc_root_sleeping(struct Qdisc qdisc)
	197	{
	198	return qdisc->dev_queue->qdisc_sleeping;
	199	}
	200
7e43f112 DM	201	/* The qdisc root lock is a mechanism by which to top level
	202	* of a qdisc tree can be locked from any qdisc node in the
	203	* forest. This allows changing the configuration of some
	204	* aspect of the qdisc tree while blocking out asynchronous
	205	* qdisc access in the packet processing paths.
	206	*
	207	* It is only legal to do this when the root will not change
	208	* on us. Otherwise we'll potentially lock the wrong qdisc
	209	* root. This is enforced by holding the RTNL semaphore, which
	210	* all users of this lock accessor must do.
	211	*/
7698b4fc DM	212	static inline spinlock_t qdisc_root_lock(struct Qdisc qdisc)
	213	{
	214	struct Qdisc *root = qdisc_root(qdisc);
	215
7e43f112	216	ASSERT_RTNL();
83874000	217	return qdisc_lock(root);
7698b4fc DM	218	}
7698b4fc DM	219
5ce2d488 DM	220	static inline struct net_device qdisc_dev(struct Qdisc qdisc)
	221	{
	222	return qdisc->dev_queue->dev;
	223	}
1da177e4	224
78a5b30b DM	225	static inline void sch_tree_lock(struct Qdisc *q)
	226	{
	227	spin_lock_bh(qdisc_root_lock(q));
	228	}
	229
	230	static inline void sch_tree_unlock(struct Qdisc *q)
	231	{
	232	spin_unlock_bh(qdisc_root_lock(q));
	233	}
	234
	235	#define tcf_tree_lock(tp) sch_tree_lock((tp)->q)
	236	#define tcf_tree_unlock(tp) sch_tree_unlock((tp)->q)
1da177e4	237
e41a33e6 TG	238	extern struct Qdisc noop_qdisc;
	239	extern struct Qdisc_ops noop_qdisc_ops;
	240
6fe1c7a5 PM	241	struct Qdisc_class_common
	242	{
	243	u32 classid;
	244	struct hlist_node hnode;
	245	};
	246
	247	struct Qdisc_class_hash
	248	{
	249	struct hlist_head *hash;
	250	unsigned int hashsize;
	251	unsigned int hashmask;
	252	unsigned int hashelems;
	253	};
	254
	255	static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
	256	{
	257	id ^= id >> 8;
	258	id ^= id >> 4;
	259	return id & mask;
	260	}
	261
	262	static inline struct Qdisc_class_common *
	263	qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
	264	{
	265	struct Qdisc_class_common *cl;
	266	struct hlist_node *n;
	267	unsigned int h;
	268
	269	h = qdisc_class_hash(id, hash->hashmask);
	270	hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
	271	if (cl->classid == id)
	272	return cl;
	273	}
	274	return NULL;
	275	}
	276
	277	extern int qdisc_class_hash_init(struct Qdisc_class_hash *);
	278	extern void qdisc_class_hash_insert(struct Qdisc_class_hash , struct Qdisc_class_common );
	279	extern void qdisc_class_hash_remove(struct Qdisc_class_hash , struct Qdisc_class_common );
	280	extern void qdisc_class_hash_grow(struct Qdisc , struct Qdisc_class_hash );
	281	extern void qdisc_class_hash_destroy(struct Qdisc_class_hash *);
	282
e41a33e6 TG	283	extern void dev_init_scheduler(struct net_device *dev);
	284	extern void dev_shutdown(struct net_device *dev);
	285	extern void dev_activate(struct net_device *dev);
	286	extern void dev_deactivate(struct net_device *dev);
	287	extern void qdisc_reset(struct Qdisc *qdisc);
	288	extern void qdisc_destroy(struct Qdisc *qdisc);
43effa1e	289	extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
5ce2d488	290	extern struct Qdisc qdisc_alloc(struct netdev_queue dev_queue,
bb949fbd	291	struct Qdisc_ops *ops);
e41a33e6	292	extern struct Qdisc qdisc_create_dflt(struct net_device dev,
bb949fbd	293	struct netdev_queue *dev_queue,
9f9afec4	294	struct Qdisc_ops *ops, u32 parentid);
175f9c1b JK	295	extern void qdisc_calculate_pkt_len(struct sk_buff *skb,
175f9c1b JK	296	struct qdisc_size_table *stab);
a48b5a61	297	extern void tcf_destroy(struct tcf_proto *tp);
ff31ab56	298	extern void tcf_destroy_chain(struct tcf_proto **fl);
1da177e4	299
5aa70995 DM	300	/* Reset all TX qdiscs of a device. */
	301	static inline void qdisc_reset_all_tx(struct net_device *dev)
	302	{
e8a0464c DM	303	unsigned int i;
	304	for (i = 0; i < dev->num_tx_queues; i++)
	305	qdisc_reset(netdev_get_tx_queue(dev, i)->qdisc);
5aa70995 DM	306	}
5aa70995 DM	307
3e745dd6 DM	308	/* Are all TX queues of the device empty? */
	309	static inline bool qdisc_all_tx_empty(const struct net_device *dev)
	310	{
e8a0464c DM	311	unsigned int i;
	312	for (i = 0; i < dev->num_tx_queues; i++) {
	313	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	314	const struct Qdisc *q = txq->qdisc;
3e745dd6	315
e8a0464c DM	316	if (q->q.qlen)
	317	return false;
	318	}
	319	return true;
3e745dd6 DM	320	}
3e745dd6 DM	321
6fa9864b DM	322	/* Are any of the TX qdiscs changing? */
	323	static inline bool qdisc_tx_changing(struct net_device *dev)
	324	{
e8a0464c DM	325	unsigned int i;
	326	for (i = 0; i < dev->num_tx_queues; i++) {
	327	struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
	328	if (txq->qdisc != txq->qdisc_sleeping)
	329	return true;
	330	}
	331	return false;
6fa9864b DM	332	}
6fa9864b DM	333
e8a0464c	334	/* Is the device using the noop qdisc on all queues? */
05297949 DM	335	static inline bool qdisc_tx_is_noop(const struct net_device *dev)
05297949 DM	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 != &noop_qdisc)
	341	return false;
	342	}
	343	return true;
05297949 DM	344	}
05297949 DM	345
0abf77e5 JK	346	static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
0abf77e5 JK	347	{
175f9c1b	348	return qdisc_skb_cb(skb)->pkt_len;
0abf77e5 JK	349	}
0abf77e5 JK	350
c27f339a	351	/* additional qdisc xmit flags (NET_XMIT_MASK in linux/netdevice.h) */
378a2f09 JP	352	enum net_xmit_qdisc_t {
378a2f09 JP	353	__NET_XMIT_STOLEN = 0x00010000,
c27f339a	354	__NET_XMIT_BYPASS = 0x00020000,
378a2f09 JP	355	};
378a2f09 JP	356
c27f339a	357	#ifdef CONFIG_NET_CLS_ACT
378a2f09	358	#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
378a2f09 JP	359	#else
	360	#define net_xmit_drop_count(e) (1)
	361	#endif
	362
5f86173b JK	363	static inline int qdisc_enqueue(struct sk_buff skb, struct Qdisc sch)
5f86173b JK	364	{
3a682fbd	365	#ifdef CONFIG_NET_SCHED
175f9c1b JK	366	if (sch->stab)
175f9c1b JK	367	qdisc_calculate_pkt_len(skb, sch->stab);
3a682fbd	368	#endif
5f86173b JK	369	return sch->enqueue(skb, sch);
	370	}
	371
	372	static inline int qdisc_enqueue_root(struct sk_buff skb, struct Qdisc sch)
	373	{
175f9c1b	374	qdisc_skb_cb(skb)->pkt_len = skb->len;
378a2f09	375	return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
5f86173b JK	376	}
5f86173b JK	377
9972b25d TG	378	static inline int __qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch,
	379	struct sk_buff_head *list)
	380	{
	381	__skb_queue_tail(list, skb);
0abf77e5 JK	382	sch->qstats.backlog += qdisc_pkt_len(skb);
0abf77e5 JK	383	sch->bstats.bytes += qdisc_pkt_len(skb);
9972b25d TG	384	sch->bstats.packets++;
	385
	386	return NET_XMIT_SUCCESS;
	387	}
	388
	389	static inline int qdisc_enqueue_tail(struct sk_buff skb, struct Qdisc sch)
	390	{
	391	return __qdisc_enqueue_tail(skb, sch, &sch->q);
	392	}
	393
	394	static inline struct sk_buff __qdisc_dequeue_head(struct Qdisc sch,
	395	struct sk_buff_head *list)
	396	{
	397	struct sk_buff *skb = __skb_dequeue(list);
	398
	399	if (likely(skb != NULL))
0abf77e5	400	sch->qstats.backlog -= qdisc_pkt_len(skb);
9972b25d TG	401
	402	return skb;
	403	}
	404
	405	static inline struct sk_buff qdisc_dequeue_head(struct Qdisc sch)
	406	{
	407	return __qdisc_dequeue_head(sch, &sch->q);
	408	}
	409
	410	static inline struct sk_buff __qdisc_dequeue_tail(struct Qdisc sch,
	411	struct sk_buff_head *list)
	412	{
	413	struct sk_buff *skb = __skb_dequeue_tail(list);
	414
	415	if (likely(skb != NULL))
0abf77e5	416	sch->qstats.backlog -= qdisc_pkt_len(skb);
9972b25d TG	417
	418	return skb;
	419	}
	420
	421	static inline struct sk_buff qdisc_dequeue_tail(struct Qdisc sch)
	422	{
	423	return __qdisc_dequeue_tail(sch, &sch->q);
	424	}
	425
	426	static inline int __qdisc_requeue(struct sk_buff skb, struct Qdisc sch,
	427	struct sk_buff_head *list)
	428	{
	429	__skb_queue_head(list, skb);
0abf77e5	430	sch->qstats.backlog += qdisc_pkt_len(skb);
9972b25d TG	431	sch->qstats.requeues++;
	432
	433	return NET_XMIT_SUCCESS;
	434	}
	435
	436	static inline int qdisc_requeue(struct sk_buff skb, struct Qdisc sch)
	437	{
	438	return __qdisc_requeue(skb, sch, &sch->q);
	439	}
	440
	441	static inline void __qdisc_reset_queue(struct Qdisc *sch,
	442	struct sk_buff_head *list)
	443	{
	444	/*
	445	* We do not know the backlog in bytes of this list, it
	446	* is up to the caller to correct it
	447	*/
93245dd6	448	__skb_queue_purge(list);
9972b25d TG	449	}
	450
	451	static inline void qdisc_reset_queue(struct Qdisc *sch)
	452	{
	453	__qdisc_reset_queue(sch, &sch->q);
	454	sch->qstats.backlog = 0;
	455	}
	456
	457	static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
	458	struct sk_buff_head *list)
	459	{
	460	struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
	461
	462	if (likely(skb != NULL)) {
0abf77e5	463	unsigned int len = qdisc_pkt_len(skb);
9972b25d TG	464	kfree_skb(skb);
	465	return len;
	466	}
	467
	468	return 0;
	469	}
	470
	471	static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
	472	{
	473	return __qdisc_queue_drop(sch, &sch->q);
	474	}
	475
	476	static inline int qdisc_drop(struct sk_buff skb, struct Qdisc sch)
	477	{
	478	kfree_skb(skb);
	479	sch->qstats.drops++;
	480
	481	return NET_XMIT_DROP;
	482	}
	483
	484	static inline int qdisc_reshape_fail(struct sk_buff skb, struct Qdisc sch)
	485	{
	486	sch->qstats.drops++;
	487
c3bc7cff	488	#ifdef CONFIG_NET_CLS_ACT
9972b25d TG	489	if (sch->reshape_fail == NULL \|\| sch->reshape_fail(skb, sch))
	490	goto drop;
	491
	492	return NET_XMIT_SUCCESS;
	493
	494	drop:
	495	#endif
	496	kfree_skb(skb);
	497	return NET_XMIT_DROP;
	498	}
	499
e9bef55d JDB	500	/* Length to Time (L2T) lookup in a qdisc_rate_table, to determine how
	501	long it will take to send a packet given its size.
	502	*/
	503	static inline u32 qdisc_l2t(struct qdisc_rate_table* rtab, unsigned int pktlen)
	504	{
e08b0998 JDB	505	int slot = pktlen + rtab->rate.cell_align + rtab->rate.overhead;
	506	if (slot < 0)
	507	slot = 0;
e9bef55d JDB	508	slot >>= rtab->rate.cell_log;
	509	if (slot > 255)
	510	return (rtab->data[255]*(slot >> 8) + rtab->data[slot & 0xFF]);
	511	return rtab->data[slot];
	512	}
	513
12da81d1 JHS	514	#ifdef CONFIG_NET_CLS_ACT
	515	static inline struct sk_buff skb_act_clone(struct sk_buff skb, gfp_t gfp_mask)
	516	{
	517	struct sk_buff *n = skb_clone(skb, gfp_mask);
	518
	519	if (n) {
	520	n->tc_verd = SET_TC_VERD(n->tc_verd, 0);
	521	n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
	522	n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
12da81d1 JHS	523	}
	524	return n;
	525	}
	526	#endif
	527
1da177e4	528	#endif