[deliverable/linux.git] / include / linux / sunrpc / xprt.h

/*
 *  linux/include/linux/sunrpc/xprt.h
 *
 *  Declarations for the RPC transport interface.
 *
 *  Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 */

#ifndef _LINUX_SUNRPC_XPRT_H
#define _LINUX_SUNRPC_XPRT_H

#include <linux/uio.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kref.h>
#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/msg_prot.h>

#ifdef __KERNEL__

#define RPC_MIN_SLOT_TABLE	(2U)
#define RPC_DEF_SLOT_TABLE	(16U)
#define RPC_MAX_SLOT_TABLE	(128U)

/*
 * This describes a timeout strategy
 */
struct rpc_timeout {
	unsigned long		to_initval,		/* initial timeout */
				to_maxval,		/* max timeout */
				to_increment;		/* if !exponential */
	unsigned int		to_retries;		/* max # of retries */
	unsigned char		to_exponential;
};

enum rpc_display_format_t {
	RPC_DISPLAY_ADDR = 0,
	RPC_DISPLAY_PORT,
	RPC_DISPLAY_PROTO,
	RPC_DISPLAY_HEX_ADDR,
	RPC_DISPLAY_HEX_PORT,
	RPC_DISPLAY_NETID,
	RPC_DISPLAY_MAX,
};

struct rpc_task;
struct rpc_xprt;
struct seq_file;

/*
 * This describes a complete RPC request
 */
struct rpc_rqst {
	/*
	 * This is the user-visible part
	 */
	struct rpc_xprt *	rq_xprt;		/* RPC client */
	struct xdr_buf		rq_snd_buf;		/* send buffer */
	struct xdr_buf		rq_rcv_buf;		/* recv buffer */

	/*
	 * This is the private part
	 */
	struct rpc_task *	rq_task;	/* RPC task data */
	__be32			rq_xid;		/* request XID */
	int			rq_cong;	/* has incremented xprt->cong */
	int			rq_reply_bytes_recvd;	/* number of reply */
							/* bytes received */
	u32			rq_seqno;	/* gss seq no. used on req. */
	int			rq_enc_pages_num;
	struct page		**rq_enc_pages;	/* scratch pages for use by
						   gss privacy code */
	void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
	struct list_head	rq_list;

	__u32 *			rq_buffer;	/* XDR encode buffer */
	size_t			rq_callsize,
				rq_rcvsize;

	struct xdr_buf		rq_private_buf;		/* The receive buffer
							 * used in the softirq.
							 */
	unsigned long		rq_majortimeo;	/* major timeout alarm */
	unsigned long		rq_timeout;	/* Current timeout value */
	unsigned int		rq_retries;	/* # of retries */
	unsigned int		rq_connect_cookie;
						/* A cookie used to track the
						   state of the transport
						   connection */
	
	/*
	 * Partial send handling
	 */
	u32			rq_bytes_sent;	/* Bytes we have sent */

	unsigned long		rq_xtime;	/* when transmitted */
	int			rq_ntrans;

#if defined(CONFIG_NFS_V4_1)
	struct list_head	rq_bc_list;	/* Callback service list */
	unsigned long		rq_bc_pa_state;	/* Backchannel prealloc state */
	struct list_head	rq_bc_pa_list;	/* Backchannel prealloc list */
#endif /* CONFIG_NFS_V4_1 */
};
#define rq_svec			rq_snd_buf.head
#define rq_slen			rq_snd_buf.len

struct rpc_xprt_ops {
	void		(*set_buffer_size)(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize);
	int		(*reserve_xprt)(struct rpc_task *task);
	void		(*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
	void		(*rpcbind)(struct rpc_task *task);
	void		(*set_port)(struct rpc_xprt *xprt, unsigned short port);
	void		(*connect)(struct rpc_task *task);
	void *		(*buf_alloc)(struct rpc_task *task, size_t size);
	void		(*buf_free)(void *buffer);
	int		(*send_request)(struct rpc_task *task);
	void		(*set_retrans_timeout)(struct rpc_task *task);
	void		(*timer)(struct rpc_task *task);
	void		(*release_request)(struct rpc_task *task);
	void		(*close)(struct rpc_xprt *xprt);
	void		(*destroy)(struct rpc_xprt *xprt);
	void		(*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq);
};

/*
 * RPC transport identifiers
 *
 * To preserve compatibility with the historical use of raw IP protocol
 * id's for transport selection, UDP and TCP identifiers are specified
 * with the previous values. No such restriction exists for new transports,
 * except that they may not collide with these values (17 and 6,
 * respectively).
 */
#define XPRT_TRANSPORT_BC       (1 << 31)
enum xprt_transports {
	XPRT_TRANSPORT_UDP	= IPPROTO_UDP,
	XPRT_TRANSPORT_TCP	= IPPROTO_TCP,
	XPRT_TRANSPORT_BC_TCP	= IPPROTO_TCP | XPRT_TRANSPORT_BC,
	XPRT_TRANSPORT_RDMA	= 256
};

struct rpc_xprt {
	struct kref		kref;		/* Reference count */
	struct rpc_xprt_ops *	ops;		/* transport methods */

	const struct rpc_timeout *timeout;	/* timeout parms */
	struct sockaddr_storage	addr;		/* server address */
	size_t			addrlen;	/* size of server address */
	int			prot;		/* IP protocol */

	unsigned long		cong;		/* current congestion */
	unsigned long		cwnd;		/* congestion window */

	size_t			max_payload;	/* largest RPC payload size,
						   in bytes */
	unsigned int		tsh_size;	/* size of transport specific
						   header */

	struct rpc_wait_queue	binding;	/* requests waiting on rpcbind */
	struct rpc_wait_queue	sending;	/* requests waiting to send */
	struct rpc_wait_queue	resend;		/* requests waiting to resend */
	struct rpc_wait_queue	pending;	/* requests in flight */
	struct rpc_wait_queue	backlog;	/* waiting for slot */
	struct list_head	free;		/* free slots */
	struct rpc_rqst *	slot;		/* slot table storage */
	unsigned int		max_reqs;	/* total slots */
	unsigned long		state;		/* transport state */
	unsigned char		shutdown   : 1,	/* being shut down */
				resvport   : 1; /* use a reserved port */
	unsigned int		bind_index;	/* bind function index */

	/*
	 * Connection of transports
	 */
	unsigned long		connect_timeout,
				bind_timeout,
				reestablish_timeout;
	unsigned int		connect_cookie;	/* A cookie that gets bumped
						   every time the transport
						   is reconnected */

	/*
	 * Disconnection of idle transports
	 */
	struct work_struct	task_cleanup;
	struct timer_list	timer;
	unsigned long		last_used,
				idle_timeout;

	/*
	 * Send stuff
	 */
	spinlock_t		transport_lock;	/* lock transport info */
	spinlock_t		reserve_lock;	/* lock slot table */
	u32			xid;		/* Next XID value to use */
	struct rpc_task *	snd_task;	/* Task blocked in send */
	struct svc_xprt		*bc_xprt;	/* NFSv4.1 backchannel */
#if defined(CONFIG_NFS_V4_1)
	struct svc_serv		*bc_serv;       /* The RPC service which will */
						/* process the callback */
	unsigned int		bc_alloc_count;	/* Total number of preallocs */
	spinlock_t		bc_pa_lock;	/* Protects the preallocated
						 * items */
	struct list_head	bc_pa_list;	/* List of preallocated
						 * backchannel rpc_rqst's */
#endif /* CONFIG_NFS_V4_1 */
	struct list_head	recv;

	struct {
		unsigned long		bind_count,	/* total number of binds */
					connect_count,	/* total number of connects */
					connect_start,	/* connect start timestamp */
					connect_time,	/* jiffies waiting for connect */
					sends,		/* how many complete requests */
					recvs,		/* how many complete requests */
					bad_xids;	/* lookup_rqst didn't find XID */

		unsigned long long	req_u,		/* average requests on the wire */
					bklog_u;	/* backlog queue utilization */
	} stat;

	const char		*address_strings[RPC_DISPLAY_MAX];
};

#if defined(CONFIG_NFS_V4_1)
/*
 * Backchannel flags
 */
#define	RPC_BC_PA_IN_USE	0x0001		/* Preallocated backchannel */
						/* buffer in use */
#endif /* CONFIG_NFS_V4_1 */

#if defined(CONFIG_NFS_V4_1)
static inline int bc_prealloc(struct rpc_rqst *req)
{
	return test_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
}
#else
static inline int bc_prealloc(struct rpc_rqst *req)
{
	return 0;
}
#endif /* CONFIG_NFS_V4_1 */

struct xprt_create {
	int			ident;		/* XPRT_TRANSPORT identifier */
	struct sockaddr *	srcaddr;	/* optional local address */
	struct sockaddr *	dstaddr;	/* remote peer address */
	size_t			addrlen;
	struct svc_xprt		*bc_xprt;	/* NFSv4.1 backchannel */
};

struct xprt_class {
	struct list_head	list;
	int			ident;		/* XPRT_TRANSPORT identifier */
	struct rpc_xprt *	(*setup)(struct xprt_create *);
	struct module		*owner;
	char			name[32];
};

/*
 * Generic internal transport functions
 */
struct rpc_xprt		*xprt_create_transport(struct xprt_create *args);
void			xprt_connect(struct rpc_task *task);
void			xprt_reserve(struct rpc_task *task);
int			xprt_reserve_xprt(struct rpc_task *task);
int			xprt_reserve_xprt_cong(struct rpc_task *task);
int			xprt_prepare_transmit(struct rpc_task *task);
void			xprt_transmit(struct rpc_task *task);
void			xprt_end_transmit(struct rpc_task *task);
int			xprt_adjust_timeout(struct rpc_rqst *req);
void			xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
void			xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
void			xprt_release(struct rpc_task *task);
struct rpc_xprt *	xprt_get(struct rpc_xprt *xprt);
void			xprt_put(struct rpc_xprt *xprt);

static inline __be32 *xprt_skip_transport_header(struct rpc_xprt *xprt, __be32 *p)
{
	return p + xprt->tsh_size;
}

/*
 * Transport switch helper functions
 */
int			xprt_register_transport(struct xprt_class *type);
int			xprt_unregister_transport(struct xprt_class *type);
int			xprt_load_transport(const char *);
void			xprt_set_retrans_timeout_def(struct rpc_task *task);
void			xprt_set_retrans_timeout_rtt(struct rpc_task *task);
void			xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
void			xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action);
void			xprt_write_space(struct rpc_xprt *xprt);
void			xprt_update_rtt(struct rpc_task *task);
void			xprt_adjust_cwnd(struct rpc_task *task, int result);
struct rpc_rqst *	xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
void			xprt_complete_rqst(struct rpc_task *task, int copied);
void			xprt_release_rqst_cong(struct rpc_task *task);
void			xprt_disconnect_done(struct rpc_xprt *xprt);
void			xprt_force_disconnect(struct rpc_xprt *xprt);
void			xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie);

/*
 * Reserved bit positions in xprt->state
 */
#define XPRT_LOCKED		(0)
#define XPRT_CONNECTED		(1)
#define XPRT_CONNECTING		(2)
#define XPRT_CLOSE_WAIT		(3)
#define XPRT_BOUND		(4)
#define XPRT_BINDING		(5)
#define XPRT_CLOSING		(6)
#define XPRT_CONNECTION_ABORT	(7)
#define XPRT_CONNECTION_CLOSE	(8)

static inline void xprt_set_connected(struct rpc_xprt *xprt)
{
	set_bit(XPRT_CONNECTED, &xprt->state);
}

static inline void xprt_clear_connected(struct rpc_xprt *xprt)
{
	clear_bit(XPRT_CONNECTED, &xprt->state);
}

static inline int xprt_connected(struct rpc_xprt *xprt)
{
	return test_bit(XPRT_CONNECTED, &xprt->state);
}

static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt)
{
	return test_and_set_bit(XPRT_CONNECTED, &xprt->state);
}

static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt)
{
	return test_and_clear_bit(XPRT_CONNECTED, &xprt->state);
}

static inline void xprt_clear_connecting(struct rpc_xprt *xprt)
{
	smp_mb__before_clear_bit();
	clear_bit(XPRT_CONNECTING, &xprt->state);
	smp_mb__after_clear_bit();
}

static inline int xprt_connecting(struct rpc_xprt *xprt)
{
	return test_bit(XPRT_CONNECTING, &xprt->state);
}

static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt)
{
	return test_and_set_bit(XPRT_CONNECTING, &xprt->state);
}

static inline void xprt_set_bound(struct rpc_xprt *xprt)
{
	test_and_set_bit(XPRT_BOUND, &xprt->state);
}

static inline int xprt_bound(struct rpc_xprt *xprt)
{
	return test_bit(XPRT_BOUND, &xprt->state);
}

static inline void xprt_clear_bound(struct rpc_xprt *xprt)
{
	clear_bit(XPRT_BOUND, &xprt->state);
}

static inline void xprt_clear_binding(struct rpc_xprt *xprt)
{
	smp_mb__before_clear_bit();
	clear_bit(XPRT_BINDING, &xprt->state);
	smp_mb__after_clear_bit();
}

static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
{
	return test_and_set_bit(XPRT_BINDING, &xprt->state);
}

#endif /* __KERNEL__*/

#endif /* _LINUX_SUNRPC_XPRT_H */
Commit	Line	Data
1da177e4	1	/*
55aa4f58	2	* linux/include/linux/sunrpc/xprt.h
1da177e4 LT	3	*
	4	* Declarations for the RPC transport interface.
	5	*
	6	* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
	7	*/
	8
	9	#ifndef _LINUX_SUNRPC_XPRT_H
	10	#define _LINUX_SUNRPC_XPRT_H
	11
	12	#include <linux/uio.h>
	13	#include <linux/socket.h>
	14	#include <linux/in.h>
6b6ca86b	15	#include <linux/kref.h>
1da177e4 LT	16	#include <linux/sunrpc/sched.h>
1da177e4 LT	17	#include <linux/sunrpc/xdr.h>
7adae489	18	#include <linux/sunrpc/msg_prot.h>
1da177e4	19
96802a09 FM	20	#ifdef __KERNEL__
96802a09 FM	21
1da177e4 LT	22	#define RPC_MIN_SLOT_TABLE (2U)
	23	#define RPC_DEF_SLOT_TABLE (16U)
	24	#define RPC_MAX_SLOT_TABLE (128U)
	25
1da177e4 LT	26	/*
	27	* This describes a timeout strategy
	28	*/
	29	struct rpc_timeout {
	30	unsigned long to_initval, /* initial timeout */
	31	to_maxval, /* max timeout */
	32	to_increment; /* if !exponential */
	33	unsigned int to_retries; /* max # of retries */
	34	unsigned char to_exponential;
	35	};
	36
edb267a6 CL	37	enum rpc_display_format_t {
	38	RPC_DISPLAY_ADDR = 0,
	39	RPC_DISPLAY_PORT,
	40	RPC_DISPLAY_PROTO,
fbfe3cc6 CL	41	RPC_DISPLAY_HEX_ADDR,
fbfe3cc6 CL	42	RPC_DISPLAY_HEX_PORT,
4417c8c4	43	RPC_DISPLAY_NETID,
edb267a6 CL	44	RPC_DISPLAY_MAX,
	45	};
	46
529b33c6 CL	47	struct rpc_task;
529b33c6 CL	48	struct rpc_xprt;
e99170ff	49	struct seq_file;
529b33c6	50
1da177e4 LT	51	/*
	52	* This describes a complete RPC request
	53	*/
	54	struct rpc_rqst {
	55	/*
	56	* This is the user-visible part
	57	*/
	58	struct rpc_xprt * rq_xprt; /* RPC client */
	59	struct xdr_buf rq_snd_buf; /* send buffer */
	60	struct xdr_buf rq_rcv_buf; /* recv buffer */
	61
	62	/*
	63	* This is the private part
	64	*/
	65	struct rpc_task * rq_task; /* RPC task data */
d8ed029d	66	__be32 rq_xid; /* request XID */
1da177e4	67	int rq_cong; /* has incremented xprt->cong */
dd2b63d0 RL	68	int rq_reply_bytes_recvd; /* number of reply */
dd2b63d0 RL	69	/* bytes received */
1da177e4	70	u32 rq_seqno; /* gss seq no. used on req. */
ead5e1c2 BF	71	int rq_enc_pages_num;
	72	struct page *rq_enc_pages; / scratch pages for use by
	73	gss privacy code */
	74	void (rq_release_snd_buf)(struct rpc_rqst ); /* release rq_enc_pages */
1da177e4 LT	75	struct list_head rq_list;
1da177e4 LT	76
02107148	77	__u32 * rq_buffer; /* XDR encode buffer */
c977a2ef	78	size_t rq_callsize,
2bea90d4	79	rq_rcvsize;
02107148	80
1da177e4 LT	81	struct xdr_buf rq_private_buf; /* The receive buffer
	82	* used in the softirq.
	83	*/
	84	unsigned long rq_majortimeo; /* major timeout alarm */
	85	unsigned long rq_timeout; /* Current timeout value */
	86	unsigned int rq_retries; /* # of retries */
7c1d71cf TM	87	unsigned int rq_connect_cookie;
	88	/* A cookie used to track the
	89	state of the transport
	90	connection */
1da177e4 LT	91
	92	/*
	93	* Partial send handling
	94	*/
1da177e4 LT	95	u32 rq_bytes_sent; /* Bytes we have sent */
	96
	97	unsigned long rq_xtime; /* when transmitted */
	98	int rq_ntrans;
56632b5b RL	99
	100	#if defined(CONFIG_NFS_V4_1)
	101	struct list_head rq_bc_list; /* Callback service list */
	102	unsigned long rq_bc_pa_state; /* Backchannel prealloc state */
	103	struct list_head rq_bc_pa_list; /* Backchannel prealloc list */
	104	#endif /* CONFIG_NFS_V4_1 */
1da177e4 LT	105	};
	106	#define rq_svec rq_snd_buf.head
	107	#define rq_slen rq_snd_buf.len
	108
a246b010	109	struct rpc_xprt_ops {
470056c2	110	void (set_buffer_size)(struct rpc_xprt xprt, size_t sndsize, size_t rcvsize);
12a80469	111	int (reserve_xprt)(struct rpc_task task);
49e9a890	112	void (release_xprt)(struct rpc_xprt xprt, struct rpc_task *task);
bbf7c1dd	113	void (rpcbind)(struct rpc_task task);
92200412	114	void (set_port)(struct rpc_xprt xprt, unsigned short port);
a246b010	115	void (connect)(struct rpc_task task);
02107148	116	void * (buf_alloc)(struct rpc_task task, size_t size);
c5a4dd8b	117	void (buf_free)(void buffer);
a246b010	118	int (send_request)(struct rpc_task task);
fe3aca29	119	void (set_retrans_timeout)(struct rpc_task task);
46c0ee8b	120	void (timer)(struct rpc_task task);
a58dd398	121	void (release_request)(struct rpc_task task);
a246b010 CL	122	void (close)(struct rpc_xprt xprt);
a246b010 CL	123	void (destroy)(struct rpc_xprt xprt);
262ca07d	124	void (print_stats)(struct rpc_xprt xprt, struct seq_file *seq);
a246b010	125	};
1da177e4	126
f300baba AB	127	/*
	128	* RPC transport identifiers
	129	*
	130	* To preserve compatibility with the historical use of raw IP protocol
	131	* id's for transport selection, UDP and TCP identifiers are specified
	132	* with the previous values. No such restriction exists for new transports,
	133	* except that they may not collide with these values (17 and 6,
	134	* respectively).
	135	*/
	136	#define XPRT_TRANSPORT_BC (1 << 31)
	137	enum xprt_transports {
	138	XPRT_TRANSPORT_UDP = IPPROTO_UDP,
	139	XPRT_TRANSPORT_TCP = IPPROTO_TCP,
	140	XPRT_TRANSPORT_BC_TCP = IPPROTO_TCP \| XPRT_TRANSPORT_BC,
	141	XPRT_TRANSPORT_RDMA = 256
	142	};
	143
1da177e4	144	struct rpc_xprt {
6b6ca86b	145	struct kref kref; /* Reference count */
a246b010	146	struct rpc_xprt_ops * ops; /* transport methods */
1da177e4	147
ba7392bb	148	const struct rpc_timeout timeout; / timeout parms */
c4efcb1d CL	149	struct sockaddr_storage addr; /* server address */
c4efcb1d CL	150	size_t addrlen; /* size of server address */
1da177e4 LT	151	int prot; /* IP protocol */
	152
	153	unsigned long cong; /* current congestion */
	154	unsigned long cwnd; /* congestion window */
	155
1da177e4 LT	156	size_t max_payload; /* largest RPC payload size,
1da177e4 LT	157	in bytes */
808012fb CL	158	unsigned int tsh_size; /* size of transport specific
808012fb CL	159	header */
1da177e4	160
4a68179d	161	struct rpc_wait_queue binding; /* requests waiting on rpcbind */
1da177e4 LT	162	struct rpc_wait_queue sending; /* requests waiting to send */
	163	struct rpc_wait_queue resend; /* requests waiting to resend */
	164	struct rpc_wait_queue pending; /* requests in flight */
	165	struct rpc_wait_queue backlog; /* waiting for slot */
	166	struct list_head free; /* free slots */
	167	struct rpc_rqst * slot; /* slot table storage */
	168	unsigned int max_reqs; /* total slots */
2226feb6	169	unsigned long state; /* transport state */
1da177e4	170	unsigned char shutdown : 1, /* being shut down */
43118c29	171	resvport : 1; /* use a reserved port */
a509050b	172	unsigned int bind_index; /* bind function index */
1da177e4	173
1da177e4	174	/*
55aa4f58	175	* Connection of transports
1da177e4	176	*/
03bf4b70 CL	177	unsigned long connect_timeout,
	178	bind_timeout,
	179	reestablish_timeout;
7c1d71cf TM	180	unsigned int connect_cookie; /* A cookie that gets bumped
	181	every time the transport
	182	is reconnected */
03bf4b70	183
1da177e4	184	/*
55aa4f58	185	* Disconnection of idle transports
1da177e4 LT	186	*/
	187	struct work_struct task_cleanup;
	188	struct timer_list timer;
03bf4b70 CL	189	unsigned long last_used,
03bf4b70 CL	190	idle_timeout;
1da177e4 LT	191
	192	/*
	193	* Send stuff
	194	*/
4a0f8c04	195	spinlock_t transport_lock; /* lock transport info */
5dc07727	196	spinlock_t reserve_lock; /* lock slot table */
e744cf2e	197	u32 xid; /* Next XID value to use */
1da177e4	198	struct rpc_task * snd_task; /* Task blocked in send */
4cfc7e60	199	struct svc_xprt bc_xprt; / NFSv4.1 backchannel */
56632b5b RL	200	#if defined(CONFIG_NFS_V4_1)
	201	struct svc_serv bc_serv; / The RPC service which will */
	202	/* process the callback */
fb7a0b9a	203	unsigned int bc_alloc_count; /* Total number of preallocs */
56632b5b RL	204	spinlock_t bc_pa_lock; /* Protects the preallocated
	205	* items */
	206	struct list_head bc_pa_list; /* List of preallocated
	207	* backchannel rpc_rqst's */
	208	#endif /* CONFIG_NFS_V4_1 */
1da177e4 LT	209	struct list_head recv;
1da177e4 LT	210
262ca07d CL	211	struct {
	212	unsigned long bind_count, /* total number of binds */
	213	connect_count, /* total number of connects */
	214	connect_start, /* connect start timestamp */
	215	connect_time, /* jiffies waiting for connect */
	216	sends, /* how many complete requests */
	217	recvs, /* how many complete requests */
	218	bad_xids; /* lookup_rqst didn't find XID */
	219
	220	unsigned long long req_u, /* average requests on the wire */
	221	bklog_u; /* backlog queue utilization */
	222	} stat;
1da177e4	223
b454ae90	224	const char *address_strings[RPC_DISPLAY_MAX];
1da177e4 LT	225	};
1da177e4 LT	226
56632b5b RL	227	#if defined(CONFIG_NFS_V4_1)
	228	/*
	229	* Backchannel flags
	230	*/
	231	#define RPC_BC_PA_IN_USE 0x0001 /* Preallocated backchannel */
	232	/* buffer in use */
	233	#endif /* CONFIG_NFS_V4_1 */
	234
55ae1aab RL	235	#if defined(CONFIG_NFS_V4_1)
	236	static inline int bc_prealloc(struct rpc_rqst *req)
	237	{
	238	return test_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
	239	}
	240	#else
	241	static inline int bc_prealloc(struct rpc_rqst *req)
	242	{
	243	return 0;
	244	}
	245	#endif /* CONFIG_NFS_V4_1 */
	246
3c341b0b	247	struct xprt_create {
4fa016eb	248	int ident; /* XPRT_TRANSPORT identifier */
d3bc9a1d	249	struct sockaddr * srcaddr; /* optional local address */
96802a09 FM	250	struct sockaddr * dstaddr; /* remote peer address */
96802a09 FM	251	size_t addrlen;
f300baba	252	struct svc_xprt bc_xprt; / NFSv4.1 backchannel */
96802a09	253	};
1da177e4	254
81c098af TT	255	struct xprt_class {
81c098af TT	256	struct list_head list;
4fa016eb	257	int ident; /* XPRT_TRANSPORT identifier */
3c341b0b	258	struct rpc_xprt * (setup)(struct xprt_create );
81c098af TT	259	struct module *owner;
	260	char name[32];
	261	};
	262
55aa4f58 CL	263	/*
	264	* Generic internal transport functions
	265	*/
3c341b0b	266	struct rpc_xprt xprt_create_transport(struct xprt_create args);
55aa4f58 CL	267	void xprt_connect(struct rpc_task *task);
55aa4f58 CL	268	void xprt_reserve(struct rpc_task *task);
12a80469 CL	269	int xprt_reserve_xprt(struct rpc_task *task);
12a80469 CL	270	int xprt_reserve_xprt_cong(struct rpc_task *task);
55aa4f58 CL	271	int xprt_prepare_transmit(struct rpc_task *task);
55aa4f58 CL	272	void xprt_transmit(struct rpc_task *task);
e0ab53de	273	void xprt_end_transmit(struct rpc_task *task);
1da177e4	274	int xprt_adjust_timeout(struct rpc_rqst *req);
49e9a890 CL	275	void xprt_release_xprt(struct rpc_xprt xprt, struct rpc_task task);
49e9a890 CL	276	void xprt_release_xprt_cong(struct rpc_xprt xprt, struct rpc_task task);
55aa4f58	277	void xprt_release(struct rpc_task *task);
6b6ca86b TM	278	struct rpc_xprt * xprt_get(struct rpc_xprt *xprt);
6b6ca86b TM	279	void xprt_put(struct rpc_xprt *xprt);
55aa4f58	280
d8ed029d	281	static inline __be32 xprt_skip_transport_header(struct rpc_xprt xprt, __be32 *p)
808012fb CL	282	{
	283	return p + xprt->tsh_size;
	284	}
	285
55aa4f58 CL	286	/*
	287	* Transport switch helper functions
	288	*/
81c098af TT	289	int xprt_register_transport(struct xprt_class *type);
81c098af TT	290	int xprt_unregister_transport(struct xprt_class *type);
441e3e24	291	int xprt_load_transport(const char *);
fe3aca29 CL	292	void xprt_set_retrans_timeout_def(struct rpc_task *task);
fe3aca29 CL	293	void xprt_set_retrans_timeout_rtt(struct rpc_task *task);
55aa4f58	294	void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
b6ddf64f	295	void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action);
c7b2cae8	296	void xprt_write_space(struct rpc_xprt *xprt);
1570c1e4	297	void xprt_update_rtt(struct rpc_task *task);
46c0ee8b	298	void xprt_adjust_cwnd(struct rpc_task *task, int result);
d8ed029d	299	struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
1570c1e4	300	void xprt_complete_rqst(struct rpc_task *task, int copied);
a58dd398	301	void xprt_release_rqst_cong(struct rpc_task *task);
62da3b24	302	void xprt_disconnect_done(struct rpc_xprt *xprt);
66af1e55	303	void xprt_force_disconnect(struct rpc_xprt *xprt);
7c1d71cf	304	void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie);
55aa4f58	305
2226feb6 CL	306	/*
	307	* Reserved bit positions in xprt->state
	308	*/
	309	#define XPRT_LOCKED (0)
	310	#define XPRT_CONNECTED (1)
	311	#define XPRT_CONNECTING (2)
632e3bdc	312	#define XPRT_CLOSE_WAIT (3)
ec739ef0	313	#define XPRT_BOUND (4)
4a68179d	314	#define XPRT_BINDING (5)
3b948ae5	315	#define XPRT_CLOSING (6)
7d1e8255	316	#define XPRT_CONNECTION_ABORT (7)
f75e6745	317	#define XPRT_CONNECTION_CLOSE (8)
2226feb6 CL	318
	319	static inline void xprt_set_connected(struct rpc_xprt *xprt)
	320	{
	321	set_bit(XPRT_CONNECTED, &xprt->state);
	322	}
	323
	324	static inline void xprt_clear_connected(struct rpc_xprt *xprt)
	325	{
	326	clear_bit(XPRT_CONNECTED, &xprt->state);
	327	}
	328
	329	static inline int xprt_connected(struct rpc_xprt *xprt)
	330	{
	331	return test_bit(XPRT_CONNECTED, &xprt->state);
	332	}
	333
	334	static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt)
	335	{
	336	return test_and_set_bit(XPRT_CONNECTED, &xprt->state);
	337	}
	338
	339	static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt)
	340	{
	341	return test_and_clear_bit(XPRT_CONNECTED, &xprt->state);
	342	}
	343
	344	static inline void xprt_clear_connecting(struct rpc_xprt *xprt)
	345	{
	346	smp_mb__before_clear_bit();
	347	clear_bit(XPRT_CONNECTING, &xprt->state);
	348	smp_mb__after_clear_bit();
	349	}
	350
	351	static inline int xprt_connecting(struct rpc_xprt *xprt)
	352	{
	353	return test_bit(XPRT_CONNECTING, &xprt->state);
	354	}
	355
	356	static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt)
	357	{
	358	return test_and_set_bit(XPRT_CONNECTING, &xprt->state);
	359	}
1da177e4	360
ec739ef0 CL	361	static inline void xprt_set_bound(struct rpc_xprt *xprt)
	362	{
	363	test_and_set_bit(XPRT_BOUND, &xprt->state);
	364	}
	365
	366	static inline int xprt_bound(struct rpc_xprt *xprt)
	367	{
	368	return test_bit(XPRT_BOUND, &xprt->state);
	369	}
	370
	371	static inline void xprt_clear_bound(struct rpc_xprt *xprt)
	372	{
	373	clear_bit(XPRT_BOUND, &xprt->state);
	374	}
	375
4a68179d CL	376	static inline void xprt_clear_binding(struct rpc_xprt *xprt)
	377	{
	378	smp_mb__before_clear_bit();
	379	clear_bit(XPRT_BINDING, &xprt->state);
	380	smp_mb__after_clear_bit();
	381	}
	382
	383	static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
	384	{
	385	return test_and_set_bit(XPRT_BINDING, &xprt->state);
	386	}
	387
1da177e4 LT	388	#endif /* __KERNEL__*/
	389
	390	#endif /* _LINUX_SUNRPC_XPRT_H */