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# Copyright 2015 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.
"""VSwitch controller for Physical to Physical deployment
"""
import logging
from core.vswitch_controller import IVswitchController
from vswitches.utils import add_ports_to_flow
_FLOW_TEMPLATE = {
'idle_timeout': '0'
}
BRIDGE_NAME = 'br0'
class VswitchControllerP2P(IVswitchController):
"""VSwitch controller for P2P deployment scenario.
Attributes:
_vswitch_class: The vSwitch class to be used.
_vswitch: The vSwitch object controlled by this controller
_deployment_scenario: A string describing the scenario to set-up in the
constructor.
"""
def __init__(self, vswitch_class):
"""Initializes up the prerequisites for the P2P deployment scenario.
:vswitch_class: the vSwitch class to be used.
"""
self._logger = logging.getLogger(__name__)
self._vswitch_class = vswitch_class
self._vswitch = vswitch_class()
self._deployment_scenario = "P2P"
self._logger.debug('Creation using ' + str(self._vswitch_class))
def setup(self):
"""Sets up the switch for p2p.
"""
self._logger.debug('Setup using ' + str(self._vswitch_class))
try:
self._vswitch.start()
self._vswitch.add_switch(BRIDGE_NAME)
(_, phy1_number) = self._vswitch.add_phy_port(BRIDGE_NAME)
(_, phy2_number) = self._vswitch.add_phy_port(BRIDGE_NAME)
self._vswitch.del_flow(BRIDGE_NAME)
# table#0 - flows designed to force 5 & 13 tuple matches go here
flow = {'table':'0', 'priority':'1', 'actions': ['goto_table:1']}
self._vswitch.add_flow(BRIDGE_NAME, flow)
# table#1 - flows to route packets between ports goes here. The
# chosen port is communicated to subsequent tables by setting the
# metadata value to the egress port number
flow = {'table':'1', 'priority':'1', 'in_port':'1',
'actions': ['write_actions(output:2)', 'write_metadata:2',
'goto_table:2']}
self._vswitch.add_flow(BRIDGE_NAME, flow)
flow = {'table':'1', 'priority':'1', 'in_port':'2',
'actions': ['write_actions(output:1)', 'write_metadata:1',
'goto_table:2']}
self._vswitch.add_flow(BRIDGE_NAME, flow)
# Frame modification table. Frame modification flow rules are
# isolated in this table so that they can be turned on or off
# without affecting the routing or tuple-matching flow rules.
flow = {'table':'2', 'priority':'1', 'actions': ['goto_table:3']}
self._vswitch.add_flow(BRIDGE_NAME, flow)
# Egress table
# (TODO) Billy O'Mahony - the drop action here actually required in
# order to egress the packet. This is the subject of a thread on
# ovs-discuss 2015-06-30.
flow = {'table':'3', 'priority':'1', 'actions': ['drop']}
self._vswitch.add_flow(BRIDGE_NAME, flow)
flow = add_ports_to_flow(_FLOW_TEMPLATE, phy2_number, phy1_number)
self._vswitch.add_flow(BRIDGE_NAME, flow)
except:
self._vswitch.stop()
raise
def stop(self):
"""Tears down the switch created in setup().
"""
self._logger.debug('Stop using ' + str(self._vswitch_class))
self._vswitch.stop()
def __enter__(self):
self.setup()
def __exit__(self, type_, value, traceback):
self.stop()
def get_vswitch(self):
"""See IVswitchController for description
"""
return self._vswitch
def get_ports_info(self):
"""See IVswitchController for description
"""
self._logger.debug('get_ports_info using ' + str(self._vswitch_class))
return self._vswitch.get_ports(BRIDGE_NAME)
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