FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfsrtt.h

     /*      $NetBSD: nfsrtt.h,v 1.10 2014/09/05 05:34:41 matt Exp $ */
     
     /*
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * Rick Macklem at The University of Guelph.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)nfsrtt.h    8.2 (Berkeley) 3/30/95
     */
    
    
    #ifndef _NFS_NFSRTT_H_
    #define _NFS_NFSRTT_H_
    
    /*
     * Definitions for performance monitor.
     * The client and server logging are turned on by setting the global
     * constant "nfsrtton" to 1.
     */
    #define NFSRTTLOGSIZ    128
    
    /*
     * Circular log of client side rpc activity. Each log entry is for one
     * rpc filled in upon completion. (ie. in order of completion)
     * The "pos" is the table index for the "next" entry, therefore the
     * list goes from nfsrtt.rttl[pos] --> nfsrtt.rttl[pos - 1] in
     * chronological order of completion.
     */
    struct rttl {
            u_int32_t       proc;                   /* NFS procedure number */
            int             rtt;                    /* Measured round trip time */
            int             rto;                    /* Round Trip Timeout */
            int             sent;                   /* # rpcs in progress */
            int             cwnd;                   /* Send window */
            int             srtt;                   /* Ave Round Trip Time */
            int             sdrtt;                  /* Ave mean deviation of RTT */
            fsid_t          fsid;                   /* Fsid for mount point */
            struct timeval  tstamp;                 /* Timestamp of log entry */
    };
    
    struct nfsrtt {
            int pos;                        /* Position in array for next entry */
            struct rttl rttl[NFSRTTLOGSIZ];
    };
    
    /*
     * And definitions for server side performance monitor.
     * The log organization is the same as above except it is filled in at the
     * time the server sends the rpc reply.
     */
    
    /*
     * Bits for the flags field.
     */
    #define DRT_TCP         0x02    /* Client used TCP transport */
    #define DRT_CACHEREPLY  0x04    /* Reply was from recent request cache */
    #define DRT_CACHEDROP   0x08    /* Rpc request dropped, due to recent reply */
    #define DRT_NFSV3       0x10    /* Rpc used NFS Version 3 */
    
    /*
     * Server log structure
     * NB: ipadr == INADDR_ANY indicates a client using a non IP protocol.
     *      (ISO perhaps?)
     */
    struct nfsdrt {
            int pos;                        /* Position of next log entry */
            struct drt {
                    int       flag;         /* Bits as defined above */
                    u_int32_t proc;         /* NFS procedure number */
                    u_int32_t ipadr;        /* IP address of client */
                    int       resptime;     /* Response time (usec) */
                    struct timeval tstamp;  /* Timestamp of log entry */
            } drt[NFSRTTLOGSIZ];
   };
   
   #ifdef _KERNEL
   extern int nfsrtton;
   #endif
   
   #endif

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