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/usr/sbin/ibstatus is in infiniband-diags 1.6.6-1.

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The actual contents of the file can be viewed below.

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#!/bin/sh

# Usage ibstatus [devname[:port]]

infiniband_base="/sys/class/infiniband"
def_ibdev="mthca0"

usage() {
	prog=`basename $0`
	echo "Usage: " $prog " [-h] [devname[:portnum]]"
	echo "	-h:	this help screen"
	echo "	Examples:"
	echo "		$prog mthca1		# shows status of all ports of 'mthca1'"
	echo "		$prog mthca0:2	# shows status port number 2 of 'mthca0'"
	echo "		$prog		# default: shows status of all '$def_ibdev' ports"
	exit -1
}

fatal() {
	echo "Fatal error: " $*
	exit -1
}


port_status() {
	port_dir="$infiniband_base/$1/ports/$2"
	echo "Infiniband device '$1' port $2 status:"
	echo "	default gid:	" `[ -r $port_dir/gids/0 ] && cat $port_dir/gids/0 || echo unknown`
	echo "	base lid:	" `[ -r $port_dir/lid ] && cat $port_dir/lid || echo unknown`
	echo "	sm lid:		" `[ -r $port_dir/sm_lid ] && cat $port_dir/sm_lid || echo unknown`
	echo "	state:		" `[ -r $port_dir/state ] && cat $port_dir/state || echo unknown`
	echo "	phys state:	" `[ -r $port_dir/phys_state ] && cat $port_dir/phys_state || echo unknown`
	echo "	rate:		" `[ -r $port_dir/rate ] && cat $port_dir/rate || echo unknown`
	echo "	link_layer:	" `[ -r $port_dir/link_layer ] && cat $port_dir/link_layer || echo IB`
	echo
}

ib_status() {
	ports_dir="$infiniband_base/$1/ports"

	if ! [ -d "$ports_dir" ]; then
		fatal "device '$1': sys files not found ($ports_dir)"
	fi

	if [ "$2" = "+" ]; then
		ports=`(cd "$infiniband_base/$1/ports" 2>/dev/null || fatal No devices; echo *)`
	else
		ports=$2
	fi

	for i in $ports; do
		port_status $1 $i
	done
}

if [ "$1" = "-h" ]; then
	usage
fi

if [ -z "$1" ]; then
	cd $infiniband_base 2>/dev/null || fatal No devices
	for dev in *; do
		ib_status $dev "+";
	done
	exit 0
fi

while [ "$1" ]; do
	dev=`echo $1 | sed 's/:.*$//'`
	port=`echo $1 | sed 's/^.*://'`

	if [ "$port" = "$dev" ]; then
		port="+"
	fi

	ib_status $dev $port
	shift
done