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/* SPDX-License-Identifier: GPL-2.0 */
/*
* linux/include/linux/sunrpc/timer.h
*
* Declarations for the RPC transport timer.
*
* Copyright (C) 2002 Trond Myklebust <trond.myklebust@fys.uio.no>
*/
#ifndef _LINUX_SUNRPC_TIMER_H
#define _LINUX_SUNRPC_TIMER_H
#include <linux/atomic.h>
struct rpc_rtt {
unsigned long timeo; /* default timeout value */
unsigned long srtt[5]; /* smoothed round trip time << 3 */
unsigned long sdrtt[5]; /* smoothed medium deviation of RTT */
int ntimeouts[5]; /* Number of timeouts for the last request */
};
extern void rpc_init_rtt(struct rpc_rtt *rt, unsigned long timeo);
extern void rpc_update_rtt(struct rpc_rtt *rt, unsigned timer, long m);
extern unsigned long rpc_calc_rto(struct rpc_rtt *rt, unsigned timer);
static inline void rpc_set_timeo(struct rpc_rtt *rt, int timer, int ntimeo)
{
int *t;
if (!timer)
return;
t = &rt->ntimeouts[timer-1];
if (ntimeo < *t) {
if (*t > 0)
(*t)--;
} else {
if (ntimeo > 8)
ntimeo = 8;
*t = ntimeo;
}
}
static inline int rpc_ntimeo(struct rpc_rtt *rt, int timer)
{
if (!timer)
return 0;
return rt->ntimeouts[timer-1];
}
#endif /* _LINUX_SUNRPC_TIMER_H */