core/vswitch_controller_p2p.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 Physical deployment
  16 """
  17
  18 import logging
  19
  20 from core.vswitch_controller import IVswitchController
  21 from conf import settings
  22
  23 _FLOW_TEMPLATE = {
  24     'idle_timeout': '0'
  25 }
  26
  27 class VswitchControllerP2P(IVswitchController):
  28     """VSwitch controller for P2P deployment scenario.
  29
  30     Attributes:
  31         _vswitch_class: The vSwitch class to be used.
  32         _vswitch: The vSwitch object controlled by this controller
  33         _deployment_scenario: A string describing the scenario to set-up in the
  34             constructor.
  35     """
  36     def __init__(self, vswitch_class):
  37         """Initializes up the prerequisites for the P2P deployment scenario.
  38
  39         :vswitch_class: the vSwitch class to be used.
  40         """
  41         self._logger = logging.getLogger(__name__)
  42         self._vswitch_class = vswitch_class
  43         self._vswitch = vswitch_class()
  44         self._deployment_scenario = "P2P"
  45         self._logger.debug('Creation using ' + str(self._vswitch_class))
  46
  47     def setup(self):
  48         """Sets up the switch for p2p.
  49         """
  50         self._logger.debug('Setup using ' + str(self._vswitch_class))
  51
  52         try:
  53             self._vswitch.start()
  54
  55             bridge = settings.getValue('VSWITCH_BRIDGE_NAME')
  56             self._vswitch.add_switch(bridge)
  57
  58             (_, _) = self._vswitch.add_phy_port(bridge)
  59             (_, _) = self._vswitch.add_phy_port(bridge)
  60
  61             self._vswitch.del_flow(bridge)
  62
  63             # table#0 - flows designed to force 5 & 13 tuple matches go here
  64             flow = {'table':'0', 'priority':'1', 'actions': ['goto_table:1']}
  65             self._vswitch.add_flow(bridge, flow)
  66
  67             # table#1 - flows to route packets between ports goes here. The
  68             # chosen port is communicated to subsequent tables by setting the
  69             # metadata value to the egress port number
  70             flow = {'table':'1', 'priority':'1', 'in_port':'1',
  71                     'actions': ['write_actions(output:2)', 'write_metadata:2',
  72                                 'goto_table:2']}
  73             self._vswitch.add_flow(bridge, flow)
  74             flow = {'table':'1', 'priority':'1', 'in_port':'2',
  75                     'actions': ['write_actions(output:1)', 'write_metadata:1',
  76                                 'goto_table:2']}
  77             self._vswitch.add_flow(bridge, flow)
  78
  79             # Frame modification table. Frame modification flow rules are
  80             # isolated in this table so that they can be turned on or off
  81             # without affecting the routing or tuple-matching flow rules.
  82             flow = {'table':'2', 'priority':'1', 'actions': ['goto_table:3']}
  83             self._vswitch.add_flow(bridge, flow)
  84
  85             # Egress table
  86             # (TODO) Billy O'Mahony - the drop action here actually required in
  87             # order to egress the packet. This is the subject of a thread on
  88             # ovs-discuss 2015-06-30.
  89             flow = {'table':'3', 'priority':'1', 'actions': ['drop']}
  90             self._vswitch.add_flow(bridge, flow)
  91         except:
  92             self._vswitch.stop()
  93             raise
  94
  95     def stop(self):
  96         """Tears down the switch created in setup().
  97         """
  98         self._logger.debug('Stop using ' + str(self._vswitch_class))
  99         self._vswitch.stop()
 100
 101     def __enter__(self):
 102         self.setup()
 103
 104     def __exit__(self, type_, value, traceback):
 105         self.stop()
 106
 107     def get_vswitch(self):
 108         """See IVswitchController for description
 109         """
 110         return self._vswitch
 111
 112     def get_ports_info(self):
 113         """See IVswitchController for description
 114         """
 115         self._logger.debug('get_ports_info  using ' + str(self._vswitch_class))
 116         return self._vswitch.get_ports(settings.getValue('VSWITCH_BRIDGE_NAME'))
 117
 118     def dump_vswitch_flows(self):
 119         """See IVswitchController for description
 120         """
 121         self._vswitch.dump_flows(settings.getValue('VSWITCH_BRIDGE_NAME'))