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 | |