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@fys.uio.no>
7 */
8
9 #ifndef _LINUX_SUNRPC_TIMER_H
10 #define _LINUX_SUNRPC_TIMER_H
11
12 #include <linux/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
rpc_set_timeo(struct rpc_rtt * rt,int timer,int ntimeo)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
rpc_ntimeo(struct rpc_rtt * rt,int timer)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