1 /* 2 * linux/include/linux/sunrpc/timer.h 3 * 4 * Declarations for the RPC transport timer. 5 * 6 * Copyright (C) 2002 Trond Myklebust <trond.myklebust (at) fys.uio.no> 7 */ 8 9 #ifndef _LINUX_SUNRPC_TIMER_H 10 #define _LINUX_SUNRPC_TIMER_H 11 12 #include <asm/atomic.h> 13 14 struct rpc_rtt { 15 unsigned long timeo; /* default timeout value */ 16 unsigned long srtt[5]; /* smoothed round trip time << 3 */ 17 unsigned long sdrtt[5]; /* smoothed medium deviation of RTT */ 18 int ntimeouts[5]; /* Number of timeouts for the last request */ 19 }; 20 21 22 extern void rpc_init_rtt(struct rpc_rtt *rt, unsigned long timeo); 23 extern void rpc_update_rtt(struct rpc_rtt *rt, unsigned timer, long m); 24 extern unsigned long rpc_calc_rto(struct rpc_rtt *rt, unsigned timer); 25 26 static inline void rpc_set_timeo(struct rpc_rtt *rt, int timer, int ntimeo) 27 { 28 int *t; 29 if (!timer) 30 return; 31 t = &rt->ntimeouts[timer-1]; 32 if (ntimeo < *t) { 33 if (*t > 0) 34 (*t)--; 35 } else { 36 if (ntimeo > 8) 37 ntimeo = 8; 38 *t = ntimeo; 39 } 40 } 41 42 static inline int rpc_ntimeo(struct rpc_rtt *rt, int timer) 43 { 44 if (!timer) 45 return 0; 46 return rt->ntimeouts[timer-1]; 47 } 48 49 #endif /* _LINUX_SUNRPC_TIMER_H */ 50
