#!/bin/bash
#
# Copyright (c) 2016 Mellanox Technologies. All rights reserved.
#
# This Software is licensed under one of the following licenses:
#
# 1) under the terms of the "Common Public License 1.0" a copy of which is
#    available from the Open Source Initiative, see
#    http://www.opensource.org/licenses/cpl.php.
#
# 2) under the terms of the "The BSD License" a copy of which is
#    available from the Open Source Initiative, see
#    http://www.opensource.org/licenses/bsd-license.php.
#
# 3) under the terms of the "GNU General Public License (GPL) Version 2" a
#    copy of which is available from the Open Source Initiative, see
#    http://www.opensource.org/licenses/gpl-license.php.
#
# Licensee has the right to choose one of the above licenses.
#
# Redistributions of source code must retain the above copyright
# notice and one of the license notices.
#
# Redistributions in binary form must reproduce both the above copyright
# notice, one of the license notices in the documentation
# and/or other materials provided with the distribution.
#
# Author: Majd Dibbiny <majd@mellanox.com>
#

DEVICE=mlx5_0
PORT=1
MODE=-1

usage="Set/Show RoCE default ToS of RDMA_CM applications

Usage:
	cma_roce_tos OPTIONS
Options:
	-h              show this help
	-d <dev>        use IB device <dev> (default mlx5_0)
	-p <port>       use port <port> of IB device (default 1)
	-t <tos>        set ToS of RoCE RDMA_CM applications (0)"

while getopts "d:t:hp:" arg; do
	case $arg in
	h)
		echo "$usage"
		exit
		;;
	d)
		DEVICE=$OPTARG
		;;
	p)
		PORT=$OPTARG
		;;
	t)
		MODE=$OPTARG
		;;
	esac
done

ID=$(id -u)
if [ $ID -ne 0 ]; then
	echo "You must be root to run this"
	exit 1
fi

if ! cat /proc/mounts | grep /sys/kernel/config > /dev/null; then
	if ! mount -t configfs none /sys/kernel/config; then
		echo "Failed to mount configfs"
		exit 1
	fi
fi

if modinfo configfs &> /dev/null; then
	if ! cat /proc/modules | grep configfs > /dev/null; then
		modprobe configfs
	fi
fi

cd /sys/kernel/config

if [ ! -d rdma_cm ]; then
	echo "Module rdma_cm is not loaded or does not support configfs"
	exit 1
fi

cd rdma_cm

if [ ! -d $DEVICE ]; then
	mkdir $DEVICE
	if [ $? -ne 0 ]; then
		echo "Failed to create configuration for $DEVICE"
		exit 1
	fi
fi

if [ ! -d $DEVICE/ports/$PORT ]; then
	echo "Device $DEVICE port $PORT does not exist"
	exit 1
fi

cd $DEVICE/ports/$PORT

if [ $MODE -ge 0 ]; then
	echo $MODE > default_roce_tos
fi
cat default_roce_tos

cd ../../..
rmdir $DEVICE

exit 0