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, traffic):
  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         self._traffic = traffic.copy()
  47
  48     def setup(self):
  49         """Sets up the switch for p2p.
  50         """
  51         self._logger.debug('Setup using ' + str(self._vswitch_class))
  52
  53         try:
  54             self._vswitch.start()
  55
  56             bridge = settings.getValue('VSWITCH_BRIDGE_NAME')
  57             self._vswitch.add_switch(bridge)
  58
  59             (_, _) = self._vswitch.add_phy_port(bridge)
  60             (_, _) = self._vswitch.add_phy_port(bridge)
  61
  62             self._vswitch.del_flow(bridge)
  63
  64             # table#0 - flows designed to force 5 & 13 tuple matches go here
  65             flow = {'table':'0', 'priority':'1', 'actions': ['goto_table:1']}
  66             self._vswitch.add_flow(bridge, flow)
  67
  68             # table#1 - flows to route packets between ports goes here. The
  69             # chosen port is communicated to subsequent tables by setting the
  70             # metadata value to the egress port number
  71
  72             # configure flows according to the TC definition
  73             flow_template = _FLOW_TEMPLATE.copy()
  74             if self._traffic['flow_type'] == 'IP':
  75                 flow_template.update({'dl_type':'0x0800', 'nw_src':self._traffic['l3']['srcip'],
  76                                       'nw_dst':self._traffic['l3']['dstip']})
  77
  78             flow = flow_template.copy()
  79             flow.update({'table':'1', 'priority':'1', 'in_port':'1',
  80                          'actions': ['write_actions(output:2)', 'write_metadata:2',
  81                                      'goto_table:2']})
  82             self._vswitch.add_flow(bridge, flow)
  83             flow = flow_template.copy()
  84             flow.update({'table':'1', 'priority':'1', 'in_port':'2',
  85                          'actions': ['write_actions(output:1)', 'write_metadata:1',
  86                                      'goto_table:2']})
  87             self._vswitch.add_flow(bridge, flow)
  88
  89             # Frame modification table. Frame modification flow rules are
  90             # isolated in this table so that they can be turned on or off
  91             # without affecting the routing or tuple-matching flow rules.
  92             flow = {'table':'2', 'priority':'1', 'actions': ['goto_table:3']}
  93             self._vswitch.add_flow(bridge, flow)
  94
  95             # Egress table
  96             # (TODO) Billy O'Mahony - the drop action here actually required in
  97             # order to egress the packet. This is the subject of a thread on
  98             # ovs-discuss 2015-06-30.
  99             flow = {'table':'3', 'priority':'1', 'actions': ['drop']}
 100             self._vswitch.add_flow(bridge, flow)
 101         except:
 102             self._vswitch.stop()
 103             raise
 104
 105     def stop(self):
 106         """Tears down the switch created in setup().
 107         """
 108         self._logger.debug('Stop using ' + str(self._vswitch_class))
 109         self._vswitch.stop()
 110
 111     def __enter__(self):
 112         self.setup()
 113
 114     def __exit__(self, type_, value, traceback):
 115         self.stop()
 116
 117     def get_vswitch(self):
 118         """See IVswitchController for description
 119         """
 120         return self._vswitch
 121
 122     def get_ports_info(self):
 123         """See IVswitchController for description
 124         """
 125         self._logger.debug('get_ports_info  using ' + str(self._vswitch_class))
 126         return self._vswitch.get_ports(settings.getValue('VSWITCH_BRIDGE_NAME'))
 127
 128     def dump_vswitch_flows(self):
 129         """See IVswitchController for description
 130         """
 131         self._vswitch.dump_flows(settings.getValue('VSWITCH_BRIDGE_NAME'))