# Copyright 2020 OpenStack Foundation
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

from neutron.agent.linux import ip_lib


class Ethtool(object):

    COMMAND = 'ethtool'

    @staticmethod
    def _cmd(cmd, namespace, **kwargs):
        ip_wrapper = ip_lib.IPWrapper(namespace)
        return ip_wrapper.netns.execute(cmd, run_as_root=True, **kwargs)

    @classmethod
    def offload(cls, device, rx, tx, namespace=None):
        rx = 'on' if rx else 'off'
        tx = 'on' if tx else 'off'
        cmd = ['--offload', device, 'rx', rx, 'tx', tx]
        cmd = [cls.COMMAND] + cmd
        cls._cmd(cmd, namespace)