Merge "multi VM: Multi VMs in serial or parallel"

5 files changed, 277 insertions, 268 deletions

diff --git a/core/component_factory.py b/core/component_factory.py
index 258b7232..7f453bd2 100644
--- a/core/component_factory.py
+++ b/core/component_factory.py
@@ -18,8 +18,7 @@
 from core.traffic_controller_rfc2544 import TrafficControllerRFC2544
 from core.vswitch_controller_clean import VswitchControllerClean
 from core.vswitch_controller_p2p import VswitchControllerP2P
-from core.vswitch_controller_pvp import VswitchControllerPVP
-from core.vswitch_controller_pvvp import VswitchControllerPVVP
+from core.vswitch_controller_pxp import VswitchControllerPXP
 from core.vswitch_controller_op2p import VswitchControllerOP2P
 from core.vswitch_controller_ptunp import VswitchControllerPtunP
 from core.vnf_controller import VnfController
@@ -57,7 +56,7 @@ def create_vswitch(deployment_scenario, vswitch_class, traffic,
 
     The returned controller is configured with the given vSwitch class.
 
-    Deployment scenarios: 'p2p', 'pvp'
+    Deployment scenarios: e.g. 'p2p', 'pvp', 'pvpv12', etc.
 
     :param deployment_scenario: The deployment scenario name
     :param vswitch_class: Reference to vSwitch class to be used.
@@ -66,18 +65,22 @@ def create_vswitch(deployment_scenario, vswitch_class, traffic,
     :return: IVSwitchController for the deployment_scenario
     """
     deployment_scenario = deployment_scenario.lower()
-    if deployment_scenario.find("p2p") == 0:
+    if deployment_scenario.startswith("p2p"):
         return VswitchControllerP2P(vswitch_class, traffic)
-    elif deployment_scenario.find("pvp") >= 0:
-        return VswitchControllerPVP(vswitch_class, traffic)
-    elif deployment_scenario.find("pvvp") >= 0:
-        return VswitchControllerPVVP(vswitch_class, traffic)
-    elif deployment_scenario.find("op2p") >= 0:
+    elif deployment_scenario.startswith("pvp"):
+        return VswitchControllerPXP(deployment_scenario, vswitch_class, traffic)
+    elif deployment_scenario.startswith("pvvp"):
+        return VswitchControllerPXP(deployment_scenario, vswitch_class, traffic)
+    elif deployment_scenario.startswith("pvpv"):
+        return VswitchControllerPXP(deployment_scenario, vswitch_class, traffic)
+    elif deployment_scenario.startswith("op2p"):
         return VswitchControllerOP2P(vswitch_class, traffic, tunnel_operation)
-    elif deployment_scenario.find("ptunp") >= 0:
+    elif deployment_scenario.startswith("ptunp"):
         return VswitchControllerPtunP(vswitch_class, traffic)
-    elif deployment_scenario.find("clean") >= 0:
+    elif deployment_scenario.startswith("clean"):
         return VswitchControllerClean(vswitch_class, traffic)
+    else:
+        raise RuntimeError("Unknown deployment scenario '{}'.".format(deployment_scenario))
 
 
 def create_vnf(deployment_scenario, vnf_class):
diff --git a/core/vnf_controller.py b/core/vnf_controller.py
index 8800ccaf..29700661 100644
--- a/core/vnf_controller.py
+++ b/core/vnf_controller.py
@@ -16,6 +16,7 @@
 
 import logging
 import pexpect
+from conf import settings
 from vnfs.vnf.vnf import IVnf
 
 class VnfController(object):
@@ -25,13 +26,13 @@ class VnfController(object):
 
     Attributes:
         _vnf_class: A class object representing the VNF to be used.
-        _deployment_scenario: A string describing the scenario to set-up in the
+        _deployment: A string describing the scenario to set-up in the
             constructor.
         _vnfs: A list of vnfs controlled by the controller.
     """
 
-    def __init__(self, deployment_scenario, vnf_class):
-        """Sets up the VNF infrastructure for the PVP deployment scenario.
+    def __init__(self, deployment, vnf_class):
+        """Sets up the VNF infrastructure based on deployment scenario
 
         :param vnf_class: The VNF class to be used.
         """
@@ -41,17 +42,38 @@ class VnfController(object):
         # setup controller with requested number of VNFs
         self._logger = logging.getLogger(__name__)
         self._vnf_class = vnf_class
-        self._deployment_scenario = deployment_scenario.upper()
-        if self._deployment_scenario == 'P2P':
-            self._vnfs = []
-        elif self._deployment_scenario == 'PVP':
-            self._vnfs = [vnf_class()]
-        elif self._deployment_scenario == 'PVVP':
-            self._vnfs = [vnf_class(), vnf_class()]
-        elif self._deployment_scenario == 'OP2P':
-            self._vnfs = []
+        self._deployment = deployment.lower()
+        self._vnfs = []
+        if self._deployment == 'pvp':
+            vm_number = 1
+        elif (self._deployment.startswith('pvvp') or
+              self._deployment.startswith('pvpv')):
+            if len(self._deployment) > 4:
+                vm_number = int(self._deployment[4:])
+            else:
+                vm_number = 2
         else:
-            self._vnfs = []
+            raise RuntimeError('Deployment {} is not supported by '
+                               'VnfController.'.format(self._deployment))
+
+        if vm_number:
+            self._logger.debug('Check configuration for %s guests.', vm_number)
+            settings.check_vm_settings(vm_number)
+            # enforce that GUEST_NIC_NR is 1 or even number of NICs
+            updated = False
+            nics_nr = settings.getValue('GUEST_NICS_NR')
+            for index in range(len(nics_nr)):
+                if nics_nr[index] > 1 and nics_nr[index] % 2:
+                    updated = True
+                    nics_nr[index] = int(nics_nr[index] / 2) * 2
+            if updated:
+                settings.setValue('GUEST_NICS_NR', nics_nr)
+                self._logger.warning('Odd number of NICs was detected. Configuration '
+                                     'was updated to GUEST_NICS_NR = %s',
+                                     settings.getValue('GUEST_NICS_NR'))
+
+            self._vnfs = [vnf_class() for _ in range(vm_number)]
+
         self._logger.debug('__init__ ' + str(len(self._vnfs)) +
                            ' VNF[s] with ' + ' '.join(map(str, self._vnfs)))
 
@@ -62,6 +84,13 @@ class VnfController(object):
                            ' VNF[s] with ' + ' '.join(map(str, self._vnfs)))
         return self._vnfs
 
+    def get_vnfs_number(self):
+        """Returns a number of vnfs controlled by this controller.
+        """
+        self._logger.debug('get_vnfs_number ' + str(len(self._vnfs)) +
+                           ' VNF[s]')
+        return len(self._vnfs)
+
     def start(self):
         """Boots all VNFs set-up by __init__.
 
diff --git a/core/vswitch_controller_pvp.py b/core/vswitch_controller_pvp.py
deleted file mode 100644
index a4f61961..00000000
--- a/core/vswitch_controller_pvp.py
+++ /dev/null
@@ -1,118 +0,0 @@
-# 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 VM to Physical deployment
-"""
-
-import logging
-
-from core.vswitch_controller import IVswitchController
-from vswitches.utils import add_ports_to_flow
-from conf import settings
-
-_FLOW_TEMPLATE = {
-    'idle_timeout': '0'
-}
-
-class VswitchControllerPVP(IVswitchController):
-    """VSwitch controller for PVP 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, traffic):
-        """Initializes up the prerequisites for the PVP 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 = "PVP"
-        self._traffic = traffic.copy()
-        self._logger.debug('Creation using ' + str(self._vswitch_class))
-
-    def setup(self):
-        """ Sets up the switch for pvp
-        """
-        self._logger.debug('Setup using ' + str(self._vswitch_class))
-
-        try:
-            self._vswitch.start()
-
-            bridge = settings.getValue('VSWITCH_BRIDGE_NAME')
-            self._vswitch.add_switch(bridge)
-
-            (_, phy1_number) = self._vswitch.add_phy_port(bridge)
-            (_, phy2_number) = self._vswitch.add_phy_port(bridge)
-            (_, vport1_number) = self._vswitch.add_vport(bridge)
-            (_, vport2_number) = self._vswitch.add_vport(bridge)
-
-            self._vswitch.del_flow(bridge)
-
-            # configure flows according to the TC definition
-            flow_template = _FLOW_TEMPLATE.copy()
-            if self._traffic['flow_type'] == 'IP':
-                flow_template.update({'dl_type':'0x0800', 'nw_src':self._traffic['l3']['srcip'],
-                                      'nw_dst':self._traffic['l3']['dstip']})
-
-            flow1 = add_ports_to_flow(flow_template, phy1_number,
-                                      vport1_number)
-            flow2 = add_ports_to_flow(flow_template, vport2_number,
-                                      phy2_number)
-            self._vswitch.add_flow(bridge, flow1)
-            self._vswitch.add_flow(bridge, flow2)
-
-            if self._traffic['bidir'] == 'True':
-                flow3 = add_ports_to_flow(flow_template, phy2_number,
-                                          vport2_number)
-                flow4 = add_ports_to_flow(flow_template, vport1_number,
-                                          phy1_number)
-                self._vswitch.add_flow(bridge, flow3)
-                self._vswitch.add_flow(bridge, flow4)
-
-        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(settings.getValue('VSWITCH_BRIDGE_NAME'))
-
-    def dump_vswitch_flows(self):
-        """See IVswitchController for description
-        """
-        self._vswitch.dump_flows(settings.getValue('VSWITCH_BRIDGE_NAME'))
diff --git a/core/vswitch_controller_pvvp.py b/core/vswitch_controller_pvvp.py
deleted file mode 100644
index 729aca3f..00000000
--- a/core/vswitch_controller_pvvp.py
+++ /dev/null
@@ -1,126 +0,0 @@
-# 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 VM to Physical deployment
-"""
-
-import logging
-
-from core.vswitch_controller import IVswitchController
-from vswitches.utils import add_ports_to_flow
-from conf import settings
-
-_FLOW_TEMPLATE = {
-    'idle_timeout': '0'
-}
-
-class VswitchControllerPVVP(IVswitchController):
-    """VSwitch controller for PVVP 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, traffic):
-        """Initializes up the prerequisites for the PVVP 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 = "PVVP"
-        self._traffic = traffic.copy()
-        self._logger.debug('Creation using ' + str(self._vswitch_class))
-
-    def setup(self):
-        """ Sets up the switch for PVVP
-        """
-        self._logger.debug('Setup using ' + str(self._vswitch_class))
-
-        try:
-            self._vswitch.start()
-
-            bridge = settings.getValue('VSWITCH_BRIDGE_NAME')
-            self._vswitch.add_switch(bridge)
-
-            (_, phy1_number) = self._vswitch.add_phy_port(bridge)
-            (_, phy2_number) = self._vswitch.add_phy_port(bridge)
-            (_, vport1_number) = self._vswitch.add_vport(bridge)
-            (_, vport2_number) = self._vswitch.add_vport(bridge)
-            (_, vport3_number) = self._vswitch.add_vport(bridge)
-            (_, vport4_number) = self._vswitch.add_vport(bridge)
-
-            self._vswitch.del_flow(bridge)
-
-            # configure flows according to the TC definition
-            flow_template = _FLOW_TEMPLATE.copy()
-            if self._traffic['flow_type'] == 'IP':
-                flow_template.update({'dl_type':'0x0800', 'nw_src':self._traffic['l3']['srcip'],
-                                      'nw_dst':self._traffic['l3']['dstip']})
-
-            flow1 = add_ports_to_flow(flow_template, phy1_number,
-                                      vport1_number)
-            flow2 = add_ports_to_flow(flow_template, vport2_number,
-                                      vport3_number)
-            flow3 = add_ports_to_flow(flow_template, vport4_number,
-                                      phy2_number)
-            self._vswitch.add_flow(bridge, flow1)
-            self._vswitch.add_flow(bridge, flow2)
-            self._vswitch.add_flow(bridge, flow3)
-
-            if self._traffic['bidir'] == 'True':
-                flow4 = add_ports_to_flow(flow_template, phy2_number,
-                                          vport4_number)
-                flow5 = add_ports_to_flow(flow_template, vport3_number,
-                                          vport2_number)
-                flow6 = add_ports_to_flow(flow_template, vport1_number,
-                                          phy1_number)
-                self._vswitch.add_flow(bridge, flow4)
-                self._vswitch.add_flow(bridge, flow5)
-                self._vswitch.add_flow(bridge, flow6)
-
-        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(settings.getValue('VSWITCH_BRIDGE_NAME'))
-
-    def dump_vswitch_flows(self):
-        """See IVswitchController for description
-        """
-        self._vswitch.dump_flows(settings.getValue('VSWITCH_BRIDGE_NAME'))
diff --git a/core/vswitch_controller_pxp.py b/core/vswitch_controller_pxp.py
new file mode 100644
index 00000000..6f53b5ac
--- /dev/null
+++ b/core/vswitch_controller_pxp.py
@@ -0,0 +1,221 @@
+# 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.
+
+"""VSwitch controller for multi VM scenarios with serial or parallel connection
+"""
+
+import logging
+import netaddr
+
+from core.vswitch_controller import IVswitchController
+from vswitches.utils import add_ports_to_flow
+from conf import settings
+
+_FLOW_TEMPLATE = {
+    'idle_timeout': '0'
+}
+
+_PROTO_TCP = 6
+_PROTO_UDP = 17
+
+class VswitchControllerPXP(IVswitchController):
+    """VSwitch controller for PXP deployment scenario.
+    """
+    def __init__(self, deployment, vswitch_class, traffic):
+        """Initializes up the prerequisites for the PXP deployment scenario.
+
+        :vswitch_class: the vSwitch class to be used.
+        :deployment: the deployment scenario to configure
+        :traffic: dictionary with detailed traffic definition
+        """
+        self._logger = logging.getLogger(__name__)
+        self._vswitch_class = vswitch_class
+        self._vswitch = vswitch_class()
+        self._pxp_topology = 'parallel' if deployment.startswith('pvpv') else 'serial'
+        if deployment == 'pvp':
+            self._pxp_vm_count = 1
+        elif deployment.startswith('pvvp') or deployment.startswith('pvpv'):
+            if len(deployment) > 4:
+                self._pxp_vm_count = int(deployment[4:])
+            else:
+                self._pxp_vm_count = 2
+        else:
+            raise RuntimeError('Unknown number of VMs involved in {} deployment.'.format(deployment))
+
+        self._deployment_scenario = deployment
+
+        self._traffic = traffic.copy()
+        self._bidir = True if self._traffic['bidir'] == 'True' else False
+        self._logger.debug('Creation using ' + str(self._vswitch_class))
+        self._bridge = settings.getValue('VSWITCH_BRIDGE_NAME')
+
+    def setup(self):
+        """ Sets up the switch for PXP
+        """
+        self._logger.debug('Setup using ' + str(self._vswitch_class))
+
+        try:
+            self._vswitch.start()
+
+            self._vswitch.add_switch(self._bridge)
+
+            # create physical ports
+            (_, phy1_number) = self._vswitch.add_phy_port(self._bridge)
+            (_, phy2_number) = self._vswitch.add_phy_port(self._bridge)
+
+            # create VM ports
+            # initialize vport array to requested number of VMs
+            guest_nics = settings.getValue('GUEST_NICS_NR')
+            vm_ports = [[] for _ in range(self._pxp_vm_count)]
+            # create as many VM ports as requested by configuration, but configure
+            # only even number of NICs or just one
+            for vmindex in range(self._pxp_vm_count):
+                # just for case, enforce even number of NICs or 1
+                nics_nr = int(guest_nics[vmindex] / 2) * 2 if guest_nics[vmindex] > 1 else 1
+                self._logger.debug('Create %s vports for %s. VM with index %s',
+                                   nics_nr, vmindex + 1, vmindex)
+                for _ in range(nics_nr):
+                    (_, vport) = self._vswitch.add_vport(self._bridge)
+                    vm_ports[vmindex].append(vport)
+
+            self._vswitch.del_flow(self._bridge)
+
+            # configure flows according to the TC definition
+            if self._pxp_topology == 'serial':
+                flow = _FLOW_TEMPLATE.copy()
+                if self._traffic['flow_type'] == 'IP':
+                    flow.update({'dl_type':'0x0800',
+                                 'nw_src':self._traffic['l3']['srcip'],
+                                 'nw_dst':self._traffic['l3']['dstip']})
+
+                # insert flows for phy ports first
+                # from 1st PHY to 1st vport of 1st VM
+                self._add_flow(flow,
+                               phy1_number,
+                               vm_ports[0][0],
+                               self._bidir)
+                # from last vport of last VM to 2nd phy
+                self._add_flow(flow,
+                               vm_ports[self._pxp_vm_count-1][-1],
+                               phy2_number,
+                               self._bidir)
+
+                # add serial connections among VMs and VM NICs pairs if needed
+                # in case of multiple NICs pairs per VM, the pairs are chained
+                # first, before flow to the next VM is created
+                for vmindex in range(self._pxp_vm_count):
+                    # connect VMs NICs pairs in case of 4 and more NICs per VM
+                    connections = [(vm_ports[vmindex][2*(x+1)-1],
+                                    vm_ports[vmindex][2*(x+1)])
+                                   for x in range(int(len(vm_ports[vmindex])/2)-1)]
+                    for connection in connections:
+                        self._add_flow(flow,
+                                       connection[0],
+                                       connection[1],
+                                       self._bidir)
+                    # connect last NICs to the next VM if there is any
+                    if self._pxp_vm_count > vmindex + 1:
+                        self._add_flow(flow,
+                                       vm_ports[vmindex][-1],
+                                       vm_ports[vmindex+1][0],
+                                       self._bidir)
+            else:
+                proto = _PROTO_TCP if self._traffic['l3']['proto'].lower() == 'tcp' else _PROTO_UDP
+                dst_mac_value = netaddr.EUI(self._traffic['l2']['dstmac']).value
+                dst_ip_value = netaddr.IPAddress(self._traffic['l3']['dstip']).value
+                # initialize stream index; every NIC pair of every VM uses unique stream
+                stream = 0
+                for vmindex in range(self._pxp_vm_count):
+                    # iterate through all VMs NIC pairs...
+                    if len(vm_ports[vmindex]) > 1:
+                        port_pairs = [(vm_ports[vmindex][2*x],
+                                       vm_ports[vmindex][2*x+1]) for x in range(int(len(vm_ports[vmindex])/2))]
+                    else:
+                        # ...or connect VM with just one NIC to both phy ports
+                        port_pairs = [(vm_ports[vmindex][0], vm_ports[vmindex][0])]
+
+                    for port_pair in port_pairs:
+                        flow_p = _FLOW_TEMPLATE.copy()
+                        flow_v = _FLOW_TEMPLATE.copy()
+
+                        # update flow based on trafficgen settings
+                        if self._traffic['stream_type'] == 'L2':
+                            tmp_mac = netaddr.EUI(dst_mac_value + stream)
+                            tmp_mac.dialect = netaddr.mac_unix_expanded
+                            flow_p.update({'dl_dst':tmp_mac})
+                        elif self._traffic['stream_type'] == 'L3':
+                            tmp_ip = netaddr.IPAddress(dst_ip_value + stream)
+                            flow_p.update({'dl_type':'0x800', 'nw_dst':tmp_ip})
+                        elif self._traffic['stream_type'] == 'L4':
+                            flow_p.update({'dl_type':'0x800', 'nw_proto':proto, 'tp_dst':stream})
+                        else:
+                            raise RuntimeError('Unknown stream_type {}'.format(self._traffic['stream_type']))
+
+                        # insert flow to dispatch traffic from physical ports
+                        # to VMs based on stream type; all traffic from VMs is
+                        # sent to physical ports to avoid issues with MAC swapping
+                        # and upper layer mods performed inside guests
+                        self._add_flow(flow_p, phy1_number, port_pair[0])
+                        self._add_flow(flow_v, port_pair[1], phy2_number)
+                        if self._bidir:
+                            self._add_flow(flow_p, phy2_number, port_pair[1])
+                            self._add_flow(flow_v, port_pair[0], phy1_number)
+
+                        # every NIC pair needs its own unique traffic stream
+                        stream += 1
+
+        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 _add_flow(self, flow, port1, port2, reverse_flow=False):
+        """ Helper method to insert flow into the vSwitch
+        """
+        self._vswitch.add_flow(self._bridge,
+                               add_ports_to_flow(flow,
+                                                 port1,
+                                                 port2))
+        if reverse_flow:
+            self._vswitch.add_flow(self._bridge,
+                                   add_ports_to_flow(flow,
+                                                     port2,
+                                                     port1))
+
+    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(self._bridge)
+
+    def dump_vswitch_flows(self):
+        """See IVswitchController for description
+        """
+        self._vswitch.dump_flows(self._bridge)