#!/sbin/sh
#
# $Id: net-tune,v 1.2 2003-06-03 09:49:50-07 rpr Exp $
#
# Rodney Rutherford <rodney@par3concepts.com>
#
# net-tune
#
# This script gets run on bootup to set the following parameters
# to optimize 100 Mbps performance.  This script is based on the
# info in the following documents:
#
# Sun INFODOC ID: 12618 SYNOPSIS: TCP/IP PSD/FAQ
# Sun INFODOC ID: 16728 SYNOPSIS: How does 100baseT auto-negotiation work?
# Sun FAQ ID: 16728 	SYNOPSIS: Speed setting on 10/100mb hme
# 
# ln /etc/init.d/net-tune /etc/rc2.d/S68net-tune
#
# Parameter info:
#
# tcp_recv_hiwat
#  
#  This  parameter specifies the default value for a connection's receive buffer
#  space; that is, the amount of buffer space allocated for received data
#  (and thus the  maximum  possible advertised  receive window).
#  In most cases, tcp_recv_hiwat should be identical to tcp_xmit_hiwat.
#  The default value is 8192 (8k).
#
# tcp_xmit_hiwat
#  
#    This  parameter specifies the default value for a connection's
#    send buffer space; that is, the amount of buffer space allocated
#    for sent but unacknowledged data. In most cases, tcp_xmit_hiwat should be
#    identical to tcp_recv_hiwat. The default value is 8192 (8k).
#
# The qfe device instances sets the configuration for the qfe driver
# for each individual port (as opposed to configuring the driver for
# all ports in /etc/system).  This works for both the qfe and hme drivers.
# (just substitute hme in place of qfe)
#
# The first ndd line selects which port to modify (instance 0 = port 0...)
#
# 	ndd -set /dev/qfe instance 0
#
# The next ndd line disables 100BaseT4 Fast-Ethernet mode 
# 100BaseT4 uses four pairs of voice- or data-grade Category 3,4,5 UTP wiring 
#
# 	ndd -set /dev/qfe adv_100T4_cap 0
#
# The following 4 ndd lines can be decoded as follows:
#
# 	qfe_adv_<SPEED><DUPLEX>dx_cap=<TRUE/FALSE>
#
# 	Where <SPEED> is 10 or 100, <DUPLEX> is "h" or "f" (half or full),
# 	<TRUE> = 1, and <FALSE> = 0
#
# The first line enables 100BaseTX Full-Duplex Fast-Ethernet
# 100BaseTX uses two pairs of data-grade Category 5 UTP or STP wiring 
# 10BaseT uses two pairs of data-grade Category 3,4,5 UTP wiring
#
# 	ndd -set /dev/qfe adv_100fdx_cap 1
# 	ndd -set /dev/qfe adv_100hdx_cap 0
# 	ndd -set /dev/qfe adv_10fdx_cap 0
# 	ndd -set /dev/qfe adv_10hdx_cap 0
#
# The last ndd line turns off auto-negotiation of speed/duplex.
#
# 	ndd -set /dev/qfe adv_autoneg_cap 0
#
PATH=/usr/bin:/usr/sbin
case "$1" in
    'start')
       echo "Setting local Solaris kernel TCP changes - ndd Tuning for 100bT"
        ndd -set /dev/tcp tcp_xmit_hiwat 65535
        ndd -set /dev/tcp tcp_recv_hiwat 65535
       echo "Setting qfe0 device to 100MB Full-Duplex..."
        ndd -set /dev/qfe instance 0
        ndd -set /dev/qfe adv_100T4_cap 0
        ndd -set /dev/qfe adv_100fdx_cap 1
        ndd -set /dev/qfe adv_100hdx_cap 0
        ndd -set /dev/qfe adv_10fdx_cap 0
        ndd -set /dev/qfe adv_10hdx_cap 0
        ndd -set /dev/qfe adv_autoneg_cap 0
       echo "Setting qfe1 device to 10MB Half-Duplex..."
        ndd -set /dev/qfe instance 1
        ndd -set /dev/qfe adv_100T4_cap 0
        ndd -set /dev/qfe adv_100fdx_cap 0
        ndd -set /dev/qfe adv_100hdx_cap 0
        ndd -set /dev/qfe adv_10fdx_cap 0
        ndd -set /dev/qfe adv_10hdx_cap 1
        ndd -set /dev/qfe adv_autoneg_cap 0
       ;;

    'stop')
       echo "No kernel parameters changed."
       ;;
    *)
       echo "Usage: $0 {start|stop}"
       ;;
esac
exit 0