core/vswitch_controller_pvp.py

   1 # Copyright 2015 Intel Corporation.
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #   http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 """VSwitch controller for Physical to VM to Physical deployment
  16 """
  17
  18 import logging
  19
  20 from core.vswitch_controller import IVswitchController
  21 from vswitches.utils import add_ports_to_flow
  22
  23 _FLOW_TEMPLATE = {
  24     'idle_timeout': '0'
  25 }
  26 BRIDGE_NAME = 'br0'
  27
  28 class VswitchControllerPVP(IVswitchController):
  29     """VSwitch controller for PVP deployment scenario.
  30
  31     Attributes:
  32         _vswitch_class: The vSwitch class to be used.
  33         _vswitch: The vSwitch object controlled by this controller
  34         _deployment_scenario: A string describing the scenario to set-up in the
  35             constructor.
  36     """
  37     def __init__(self, vswitch_class, bidir=False):
  38         """Initializes up the prerequisites for the PVP deployment scenario.
  39
  40         :vswitch_class: the vSwitch class to be used.
  41         """
  42         self._logger = logging.getLogger(__name__)
  43         self._vswitch_class = vswitch_class
  44         self._vswitch = vswitch_class()
  45         self._deployment_scenario = "PVP"
  46         self._bidir = bidir
  47         self._logger.debug('Creation using ' + str(self._vswitch_class))
  48
  49     def setup(self):
  50         """ Sets up the switch for pvp
  51         """
  52         self._logger.debug('Setup using ' + str(self._vswitch_class))
  53
  54         try:
  55             self._vswitch.start()
  56
  57             self._vswitch.add_switch(BRIDGE_NAME)
  58
  59             (_, phy1_number) = self._vswitch.add_phy_port(BRIDGE_NAME)
  60             (_, phy2_number) = self._vswitch.add_phy_port(BRIDGE_NAME)
  61             (_, vport1_number) = self._vswitch.add_vport(BRIDGE_NAME)
  62             (_, vport2_number) = self._vswitch.add_vport(BRIDGE_NAME)
  63
  64             self._vswitch.del_flow(BRIDGE_NAME)
  65             flow1 = add_ports_to_flow(_FLOW_TEMPLATE, phy1_number,
  66                                       vport1_number)
  67             flow2 = add_ports_to_flow(_FLOW_TEMPLATE, vport2_number,
  68                                       phy2_number)
  69             self._vswitch.add_flow(BRIDGE_NAME, flow1)
  70             self._vswitch.add_flow(BRIDGE_NAME, flow2)
  71
  72             if self._bidir:
  73                 flow3 = add_ports_to_flow(_FLOW_TEMPLATE, phy2_number,
  74                                           vport2_number)
  75                 flow4 = add_ports_to_flow(_FLOW_TEMPLATE, vport1_number,
  76                                           phy1_number)
  77                 self._vswitch.add_flow(BRIDGE_NAME, flow3)
  78                 self._vswitch.add_flow(BRIDGE_NAME, flow4)
  79
  80         except:
  81             self._vswitch.stop()
  82             raise
  83
  84     def stop(self):
  85         """Tears down the switch created in setup().
  86         """
  87         self._logger.debug('Stop using ' + str(self._vswitch_class))
  88         self._vswitch.stop()
  89
  90     def __enter__(self):
  91         self.setup()
  92
  93     def __exit__(self, type_, value, traceback):
  94         self.stop()
  95
  96     def get_vswitch(self):
  97         """See IVswitchController for description
  98         """
  99         return self._vswitch
 100
 101     def get_ports_info(self):
 102         """See IVswitchController for description
 103         """
 104         self._logger.debug('get_ports_info  using ' + str(self._vswitch_class))
 105         return self._vswitch.get_ports(BRIDGE_NAME)