#!/bin/bash
#
# Copyright (c) 2021 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.


RC=0

mode=${1:-enable}
status="enabled"

default_grub=/etc/default/grub
modprobe_conf_file=/etc/modprobe.d/mlnx-bf-nf-flowtable.conf
modprobe_nf_flowtable_script=/usr/share/mlnx_ofed/mlnx_bf_assign_ct_cores.sh

prog=`basename $0`

info()
{
	logger -t $prog -i "INFO: $*"
}

error()
{
	logger -t $prog -i "ERR: $*"
	echo "$*"
	exit $RC
}

function exec_print()
{
	info Executing: "$@";
	eval "$@"
}

function get_status()
{
	info "Executing status command"

	if [ ! -f $modprobe_nf_flowtable_script ]; then
		info "${modprobe_nf_flowtable_script} is not installed"
		status="disabled"
	fi

	exec_print grep GRUB_CMDLINE_LINUX=.*isolcpus=6,7 $default_grub >/dev/null 2>&1
	rc=$?
	if [ $rc -ne 0 ]; then
		info "isolcpus parameter is not configured in $default_grub"
		status="disabled"
	fi

	if [ ! -f $modprobe_conf_file ]; then
		info "$modprobe_conf_file does not exist"
		status="disabled"
	fi

	exec_print grep isolcpus=6,7 $grub_cfg >/dev/null 2>&1;
	rc=$?
	if [ $rc -ne 0 ]; then
		info "isolcpus parameter is not configured in $grub_cfg"
		status="disabled"
	fi
}

if ! lspci -s 00:00.0 2> /dev/null | grep -wq "PCI bridge: Mellanox Technologies"; then
	RC=1
	error Not a Bluefield device
fi

if [ ! $mode == "enable" ] && [ ! $mode == "disable" ] && [ ! $mode == "status" ]; then
	RC=2
	echo $0 [enable|disable|status]
	exit $RC
fi

. /etc/os-release
if [ $ID == "centos" ] || [ $ID == "rocky" ]; then
	grub_cfg=/etc/grub2-efi.cfg
	grub_mk_config=/usr/sbin/grub2-mkconfig
elif [ $ID == "debian" ]; then
	grub_cfg=/boot/grub/grub.cfg
	grub_mk_config=/usr/sbin/grub-mkconfig
elif [ $ID == "ubuntu" ]; then
	grub_cfg=/boot/grub/grub.cfg
	grub_mk_config=/usr/sbin/grub-mkconfig
else
	RC=3
	error CT configuration can run only on Bluefield Centos/Rocky/Debian/Ubuntu distributions
fi

if [ -f $grub_mk_config ]; then
	info "Using ${grub_mk_config} file"
else
	RC=5
	error Cannot find \(${grub_mk_config}\)
fi

if [ -f $grub_cfg ]; then
	info "Using ${grub_cfg} file"
else
	RC=6
	error Cannot find the grub configruation file \(${grub_cfg}\)
fi

if [ -f $default_grub ]; then
	info "Using ${default_grub} file"
else
	RC=7
	error $default_grub does not exist
fi

if ! grep GRUB_CMDLINE_LINUX= $default_grub >/dev/null 2>&1 ; then
	RC=8
	error $default_grub does not contain a GRUB_CMDLINE_LINUX configuration
fi

if [ $mode == "status" ]; then
	get_status;

	echo $status
	exit 0;
fi

# cleanup (this is also the disable action)
exec_print sed -i "/GRUB_CMDLINE_LINUX/s/isolcpus=6,7//" $default_grub
if [ -f $modprobe_conf_file ]; then
	exec_print rm -f $modprobe_conf_file
fi

if [ $mode == "enable" ]; then
	if [ ! -f $modprobe_nf_flowtable_script ]; then
		RC=9
		error "${modprobe_nf_flowtable_script} is not installed"
	fi

	modprobe=`which modprobe 2>/dev/null`
	if [ ! -n "$modprobe" ]; then
		RC=10
		error modprobe not found
	fi

	exec_print 'sed -in "/GRUB_CMDLINE_LINUX=/s/\"$/ \isolcpus=6,7&/" $default_grub'

	if [ ! -f $modprobe_conf_file ]; then
		exec_print 'echo "install nf_flow_table $modprobe --ignore-install nf_flow_table $CMDLINE_OPTS && $modprobe_nf_flowtable_script" > ${modprobe_conf_file}'
	fi
fi

exec_print ${grub_mk_config} -o $grub_cfg >/dev/null 2>&1
rc=$?
if [ $rc -ne 0 ]; then
	RC=10
	error "Failed setting grub config"
fi

echo Success
echo System reboot is required

exit $RC