1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * linux/include/linux/sunrpc/timer.h
4 *
5 * Declarations for the RPC transport timer.
6 *
7 * Copyright (C) 2002 Trond Myklebust <trond.myklebust@fys.uio.no>
8 */
9
10 #ifndef _LINUX_SUNRPC_TIMER_H
11 #define _LINUX_SUNRPC_TIMER_H
12
13 #include <linux/atomic.h>
14
15 struct rpc_rtt {
16 unsigned long timeo; /* default timeout value */
17 unsigned long srtt[5]; /* smoothed round trip time << 3 */
18 unsigned long sdrtt[5]; /* smoothed medium deviation of RTT */
19 int ntimeouts[5]; /* Number of timeouts for the last request */
20 };
21
22
23 extern void rpc_init_rtt(struct rpc_rtt *rt, unsigned long timeo);
24 extern void rpc_update_rtt(struct rpc_rtt *rt, unsigned timer, long m);
25 extern unsigned long rpc_calc_rto(struct rpc_rtt *rt, unsigned timer);
26
27 static inline void rpc_set_timeo(struct rpc_rtt *rt, int timer, int ntimeo)
28 {
29 int *t;
30 if (!timer)
31 return;
32 t = &rt->ntimeouts[timer-1];
33 if (ntimeo < *t) {
34 if (*t > 0)
35 (*t)--;
36 } else {
37 if (ntimeo > 8)
38 ntimeo = 8;
39 *t = ntimeo;
40 }
41 }
42
43 static inline int rpc_ntimeo(struct rpc_rtt *rt, int timer)
44 {
45 if (!timer)
46 return 0;
47 return rt->ntimeouts[timer-1];
48 }
49
50 #endif /* _LINUX_SUNRPC_TIMER_H */
51
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