| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 <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 */ |