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/*
* rpcsock.h Declarations for the RPC call interface.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#ifndef _LINUX_RPCSOCK_H
#define _LINUX_RPCSOCK_H
/*
* The rpcsock code maintains an estimate on the maximum number of out-
* standing RPC requests, using the congestion avoidance implemented in
* 44BSD. This is basically the Van Jacobson slow start algorithm: If a
* retransmit occurs, the congestion window is halved; otherwise, it is
* incremented by 1/cwnd when a reply is received and a full number of
* requests are outstanding.
*
* Upper procedures may check whether a request would block waiting for
* a free RPC slot by using the RPC_CONGESTED() macro.
*
* Note: on machines with low memory we should probably use a smaller
* MAXREQS value: At 32 outstanding reqs with 8 megs of RAM, fragment
* reassembly will frequently run out of memory.
*/
#define RPC_MAXREQS 32
#define RPC_CWNDSCALE 256
#define RPC_MAXCWND (RPC_MAXREQS * RPC_CWNDSCALE)
/* #define RPC_INITCWND (RPC_MAXCWND / 2) */
#define RPC_INITCWND RPC_CWNDSCALE
#define RPC_CONGESTED(rsock) ((rsock)->cong >= (rsock)->cwnd)
/* RPC reply header size: xid, direction, status, accept_status (verifier
* size computed separately)
*/
#define RPC_HDRSIZE (4 * 4)
/*
* This describes a timeout strategy
*/
struct rpc_timeout {
unsigned long to_initval,
to_maxval,
to_increment;
int to_retries;
char to_exponential;
};
/*
* This describes a complete RPC request
*/
struct rpc_ioreq {
struct rpc_wait * rq_slot;
struct sockaddr * rq_addr;
int rq_alen;
struct iovec rq_svec[UIO_FASTIOV];
unsigned int rq_snr;
unsigned long rq_slen;
struct iovec rq_rvec[UIO_FASTIOV];
unsigned int rq_rnr;
unsigned long rq_rlen;
};
/*
* This is the callback handler for async RPC.
*/
struct rpc_wait;
typedef void (*rpc_callback_fn_t)(int, struct rpc_wait *, void *);
#endif /* _LINUX_RPCSOCK_H */