Pass physical bridge informations to OVS agent extension API

The metadata agent extension needs the patch ports informations
between br-int and br-meta to add direct flows.

Partially-Implements: blueprint distributed-metadata-datapath
Change-Id: I58f3813ed9a4c4006ebb62e613ef4dc07a17a23b

neutron/plugins/ml2/drivers/openvswitch/agent/ovs_agent_extension_api.py

@@ -41,12 +41,18 @@ class OVSAgentExtensionAPI(object):
     '''
 
     def __init__(self, int_br, tun_br, phys_brs=None,
-                 plugin_rpc=None):
+                 plugin_rpc=None,
+                 phys_ofports=None,
+                 bridge_mappings=None):
         super(OVSAgentExtensionAPI, self).__init__()
         self.br_int = int_br
         self.br_tun = tun_br
         self.br_phys = phys_brs or {}
         self.plugin_rpc = plugin_rpc
+        # OVS agent extensions use this map to get physical device ofport.
+        self.phys_ofports = phys_ofports or {}
+        # OVS agent extensions use this map to get ovs bridge.
+        self.bridge_mappings = bridge_mappings or {}
 
     def request_int_br(self):
         """Allows extensions to request an integration bridge to use for
@@ -74,3 +80,12 @@ class OVSAgentExtensionAPI(object):
         """
         for phy_br in self.br_phys.values():
             yield OVSCookieBridge(phy_br)
+
+    def request_physical_br(self, name):
+        """Allows extensions to request one physical bridge to use for
+        extension specific flows.
+        """
+        if not self.br_phys.get(name):
+            return None
+
+        return OVSCookieBridge(self.br_phys.get(name))

neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py

@@ -312,10 +312,14 @@ class OVSNeutronAgent(l2population_rpc.L2populationRpcCallBackTunnelMixin,
         self.ancillary_brs = self.setup_ancillary_bridges(
             ovs_conf.integration_bridge, ovs_conf.tunnel_bridge)
 
-        agent_api = ovs_ext_api.OVSAgentExtensionAPI(self.int_br,
-                                                     self.tun_br,
-                                                     self.phys_brs,
-                                                     self.plugin_rpc)
+        agent_api = ovs_ext_api.OVSAgentExtensionAPI(
+            self.int_br,
+            self.tun_br,
+            self.phys_brs,
+            self.plugin_rpc,
+            phys_ofports=self.phys_ofports,
+            bridge_mappings=self.bridge_mappings)
+
         self.ext_manager.initialize(
             self.connection, ovs_const.EXTENSION_DRIVER_TYPE, agent_api)
 

neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_agent_extension_api.py

@@ -68,6 +68,14 @@ class TestOVSAgentExtensionAPI(ovs_test_base.OVSOSKenTestBase):
         for phys_br in agent_extension_api.request_phy_brs():
             self._test_bridge(self.br_phys[phys_br.br_name], phys_br)
 
+    def test_request_physical_br(self):
+        agent_extension_api = ovs_ext_agt.OVSAgentExtensionAPI(
+            self.br_int, self.br_tun,
+            {'phys1': self.br_phys['br-phys1'],
+             'phys2': self.br_phys['br-phys2']})
+        phys_br = agent_extension_api.request_physical_br('phys1')
+        self._test_bridge(self.br_phys[phys_br.br_name], phys_br)
+
 
 class TestOVSCookieBridgeOSKen(native_ovs_bridge_test_base.OVSBridgeTestBase):