include/linux/sunrpc/xprt.h - arm/linux-arm64-legacy - Git at Google

 /*
  *  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/sunrpc/sched.h>
 #include <linux/sunrpc/xdr.h>

 extern unsigned int xprt_udp_slot_table_entries;
 extern unsigned int xprt_tcp_slot_table_entries;

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

 /*
  * RPC call and reply header size as number of 32bit words (verifier
  * size computed separately)
  */
 #define RPC_CALLHDRSIZE		6
 #define RPC_REPHDRSIZE		4

 /*
  * Parameters for choosing a free port
  */
 extern unsigned int xprt_min_resvport;
 extern unsigned int xprt_max_resvport;

 #define RPC_MIN_RESVPORT	(1U)
 #define RPC_MAX_RESVPORT	(65535U)
 #define RPC_DEF_MIN_RESVPORT	(650U)
 #define RPC_DEF_MAX_RESVPORT	(1023U)

 /*
  * 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;
 };

 struct rpc_task;
 struct rpc_xprt;

 /*
  * 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 */
 	__u32			rq_xid;		/* request XID */
 	int			rq_cong;	/* has incremented xprt->cong */
 	int			rq_received;	/* receive completed */
 	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_bufsize;

 	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 */

 	/*
 	 * Partial send handling
 	 */
 	u32			rq_bytes_sent;	/* Bytes we have sent */

 	unsigned long		rq_xtime;	/* when transmitted */
 	int			rq_ntrans;
 };
 #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		(*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)(struct rpc_task *task);
 	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);
 };

 struct rpc_xprt {
 	struct rpc_xprt_ops *	ops;		/* transport methods */
 	struct socket *		sock;		/* BSD socket layer */
 	struct sock *		inet;		/* INET layer */

 	struct rpc_timeout	timeout;	/* timeout parms */
 	struct sockaddr_in	addr;		/* server address */
 	int			prot;		/* IP protocol */

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

 	size_t			rcvsize,	/* transport rcv buffer size */
 				sndsize;	/* transport send buffer size */

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

 	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 */

 	/*
 	 * XID
 	 */
 	__u32			xid;		/* Next XID value to use */

 	/*
 	 * State of TCP reply receive stuff
 	 */
 	u32			tcp_recm,	/* Fragment header */
 				tcp_xid,	/* Current XID */
 				tcp_reclen,	/* fragment length */
 				tcp_offset;	/* fragment offset */
 	unsigned long		tcp_copied,	/* copied to request */
 				tcp_flags;
 	/*
 	 * Connection of transports
 	 */
 	unsigned long		connect_timeout,
 				bind_timeout,
 				reestablish_timeout;
 	struct work_struct	connect_worker;
 	unsigned short		port;

 	/*
 	 * 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 */
 	struct rpc_task *	snd_task;	/* Task blocked in send */

 	struct list_head	recv;


 	void			(*old_data_ready)(struct sock *, int);
 	void			(*old_state_change)(struct sock *);
 	void			(*old_write_space)(struct sock *);
 };

 #define XPRT_LAST_FRAG		(1 << 0)
 #define XPRT_COPY_RECM		(1 << 1)
 #define XPRT_COPY_XID		(1 << 2)
 #define XPRT_COPY_DATA		(1 << 3)

 #ifdef __KERNEL__

 /*
  * Transport operations used by ULPs
  */
 struct rpc_xprt *	xprt_create_proto(int proto, struct sockaddr_in *addr, struct rpc_timeout *to);
 void			xprt_set_timeout(struct rpc_timeout *to, unsigned int retr, unsigned long incr);

 /*
  * Generic internal transport functions
  */
 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_abort_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);
 int			xprt_destroy(struct rpc_xprt *xprt);

 static inline u32 *xprt_skip_transport_header(struct rpc_xprt *xprt, u32 *p)
 {
 	return p + xprt->tsh_size;
 }

 /*
  * Transport switch helper functions
  */
 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);
 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, u32 xid);
 void			xprt_complete_rqst(struct rpc_task *task, int copied);
 void			xprt_release_rqst_cong(struct rpc_task *task);
 void			xprt_disconnect(struct rpc_xprt *xprt);

 /*
  * Socket transport setup operations
  */
 int			xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to);
 int			xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to);

 /*
  * Reserved bit positions in xprt->state
  */
 #define XPRT_LOCKED		(0)
 #define XPRT_CONNECTED		(1)
 #define XPRT_CONNECTING		(2)
 #define XPRT_CLOSE_WAIT		(3)

 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);
 }

 #endif /* __KERNEL__*/

 #endif /* _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/sunrpc/sched.h>
	#include <linux/sunrpc/xdr.h>

	extern unsigned int xprt_udp_slot_table_entries;
	extern unsigned int xprt_tcp_slot_table_entries;

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

	/*
	* RPC call and reply header size as number of 32bit words (verifier
	* size computed separately)
	*/
	#define RPC_CALLHDRSIZE 6
	#define RPC_REPHDRSIZE 4

	/*
	* Parameters for choosing a free port
	*/
	extern unsigned int xprt_min_resvport;
	extern unsigned int xprt_max_resvport;

	#define RPC_MIN_RESVPORT (1U)
	#define RPC_MAX_RESVPORT (65535U)
	#define RPC_DEF_MIN_RESVPORT (650U)
	#define RPC_DEF_MAX_RESVPORT (1023U)

	/*
	* 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;
	};

	struct rpc_task;
	struct rpc_xprt;

	/*
	* 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 */
	__u32 rq_xid; /* request XID */
	int rq_cong; /* has incremented xprt->cong */
	int rq_received; /* receive completed */
	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_bufsize;

	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 */

	/*
	* Partial send handling
	*/
	u32 rq_bytes_sent; /* Bytes we have sent */

	unsigned long rq_xtime; /* when transmitted */
	int rq_ntrans;
	};
	#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 (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)(struct rpc_task task);
	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);
	};

	struct rpc_xprt {
	struct rpc_xprt_ops * ops; /* transport methods */
	struct socket * sock; /* BSD socket layer */
	struct sock * inet; /* INET layer */

	struct rpc_timeout timeout; /* timeout parms */
	struct sockaddr_in addr; /* server address */
	int prot; /* IP protocol */

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

	size_t rcvsize, /* transport rcv buffer size */
	sndsize; /* transport send buffer size */

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

	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 */

	/*
	* XID
	*/
	__u32 xid; /* Next XID value to use */

	/*
	* State of TCP reply receive stuff
	*/
	u32 tcp_recm, /* Fragment header */
	tcp_xid, /* Current XID */
	tcp_reclen, /* fragment length */
	tcp_offset; /* fragment offset */
	unsigned long tcp_copied, /* copied to request */
	tcp_flags;
	/*
	* Connection of transports
	*/
	unsigned long connect_timeout,
	bind_timeout,
	reestablish_timeout;
	struct work_struct connect_worker;
	unsigned short port;

	/*
	* 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 */
	struct rpc_task * snd_task; /* Task blocked in send */

	struct list_head recv;


	void (old_data_ready)(struct sock , int);
	void (old_state_change)(struct sock );
	void (old_write_space)(struct sock );
	};

	#define XPRT_LAST_FRAG (1 << 0)
	#define XPRT_COPY_RECM (1 << 1)
	#define XPRT_COPY_XID (1 << 2)
	#define XPRT_COPY_DATA (1 << 3)

	#ifdef __KERNEL__

	/*
	* Transport operations used by ULPs
	*/
	struct rpc_xprt * xprt_create_proto(int proto, struct sockaddr_in addr, struct rpc_timeout to);
	void xprt_set_timeout(struct rpc_timeout *to, unsigned int retr, unsigned long incr);

	/*
	* Generic internal transport functions
	*/
	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_abort_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);
	int xprt_destroy(struct rpc_xprt *xprt);

	static inline u32 xprt_skip_transport_header(struct rpc_xprt xprt, u32 *p)
	{
	return p + xprt->tsh_size;
	}

	/*
	* Transport switch helper functions
	*/
	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);
	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, u32 xid);
	void xprt_complete_rqst(struct rpc_task *task, int copied);
	void xprt_release_rqst_cong(struct rpc_task *task);
	void xprt_disconnect(struct rpc_xprt *xprt);

	/*
	* Socket transport setup operations
	*/
	int xs_setup_udp(struct rpc_xprt xprt, struct rpc_timeout to);
	int xs_setup_tcp(struct rpc_xprt xprt, struct rpc_timeout to);

	/*
	* Reserved bit positions in xprt->state
	*/
	#define XPRT_LOCKED (0)
	#define XPRT_CONNECTED (1)
	#define XPRT_CONNECTING (2)
	#define XPRT_CLOSE_WAIT (3)

	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);
	}

	#endif /* __KERNEL__*/

	#endif /* _LINUX_SUNRPC_XPRT_H */