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# Copyright 2016 Intel Corporation.
#
# 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.
"""Packet forwarder controller for Physical to Physical deployment
"""
import logging
from conf import settings
class PktFwdController(object):
"""Packet forwarder controller for P2P deployment scenario.
Attributes:
_pktfwd_class: The packet forwarder class to be used.
_pktfwd: The packet forwarder object controlled by this controller
"""
def __init__(self, deployment, pktfwd_class):
"""Initializes up the prerequisites for the P2P deployment scenario.
:vswitch_class: the vSwitch class to be used.
"""
self._deployment = deployment
self._logger = logging.getLogger(__name__)
self._pktfwd_class = pktfwd_class
self._pktfwd = pktfwd_class(guest=True if deployment == "pvp" and
settings.getValue('VNF') != "QemuPciPassthrough" else False)
self._logger.debug('Creation using ' + str(self._pktfwd_class))
def setup(self):
"""Sets up the packet forwarder for p2p.
"""
self._logger.debug('Setup using ' + str(self._pktfwd_class))
try:
self._pktfwd.start()
except:
self._pktfwd.stop()
raise
def get_vswitch(self):
"""See IVswitchController for description
"""
return self._pktfwd
def setup_for_guest(self):
"""Sets up the packet forwarder for pvp.
"""
self._logger.debug('Setup using ' + str(self._pktfwd_class))
try:
self._pktfwd.start_for_guest()
except:
self._pktfwd.stop()
raise
def stop(self):
"""Tears down the packet forwarder created in setup().
"""
self._logger.debug('Stop using ' + str(self._pktfwd_class))
self._pktfwd.stop()
def __enter__(self):
if self._deployment.find("p2p") == 0:
self.setup()
elif self._deployment == "pvp" and settings.getValue('VNF') != "QemuPciPassthrough":
self.setup_for_guest()
def __exit__(self, type_, value, traceback):
if self._deployment.find("p2p") == 0:
self.stop()
elif self._deployment == "pvp" and settings.getValue('VNF') != "QemuPciPassthrough":
self.stop()
def get_pktfwd(self):
"""Get the controlled packet forwarder
:return: The controlled IPktFwd
"""
return self._pktfwd
def dump_vswitch_flows(self):
""" Dumps flows from vswitch
"""
raise NotImplementedError(
"The PktFwdController does not implement the "
"\"dump_vswitch_flows\" function.")
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