integration: Support for VxLAN TC without using overlay traffic gen.

The test case for verifying the vxlan tunneling feature without using any
ingress tunnel traffic. The virtual switch(OVS) is configured to mangle and
generate tunnel traffic in the deployment. The packet flow in the test case is
as follows

TRAFFIC-IN --> [ENCAP-PKT] --> [MOD-PKT] --> [DECAP-PKT] --> TRAFFIC-OUT

 ENCAP-PKT - Encapsulate the ingress packet to a tunnel type.
 MOD-PKT   - Modify the tunnel header to match the following decap interface.
 DECAP-PKT - Decapsulate the newly generated tunneled packet.

Change-Id: Ie24bacb3cb1c069bd60403e5a4ef8bcdf0e12e54
Signed-off-by: Sugesh Chandran <sugesh.chandran@intel.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/vswitches/ovs.py b/vswitches/ovs.py
index 243619b6..d2814b6a 100644
--- a/vswitches/ovs.py
+++ b/vswitches/ovs.py
@@ -122,6 +122,38 @@ class IVSwitchOvs(IVSwitch, tasks.Process):
         """
         raise NotImplementedError
 
+    def add_veth_pair_port(self, switch_name=None, remote_switch_name=None,
+                      local_opts=None, remote_opts=None):
+        """Creates veth-pair port between 'switch_name' and 'remote_switch_name'
+
+        """
+        if switch_name is None or remote_switch_name is None:
+            return
+
+        bridge = self._bridges[switch_name]
+        remote_bridge = self._bridges[remote_switch_name]
+        pcount = str(self._get_port_count('type=patch'))
+        # TODO ::: What if interface name longer than allowed width??
+        local_port_name = switch_name + '-' + remote_switch_name + '-' + pcount
+        remote_port_name = remote_switch_name + '-' + switch_name + '-' + pcount
+        local_params = ['--', 'set', 'Interface', local_port_name,
+                        'type=patch',
+                        'options:peer=' + remote_port_name]
+        remote_params = ['--', 'set', 'Interface', remote_port_name,
+                        'type=patch',
+                        'options:peer=' + local_port_name]
+
+        if local_opts is not None:
+            local_params = local_params + local_opts
+
+        if remote_opts is not None:
+            remote_params = remote_params + remote_opts
+
+        local_of_port = bridge.add_port(local_port_name, local_params)
+        remote_of_port = remote_bridge.add_port(remote_port_name, remote_params)
+        return [(local_port_name, local_of_port),
+                (remote_port_name, remote_of_port)]
+
     def add_tunnel_port(self, switch_name, remote_ip, tunnel_type='vxlan', params=None):
         """Creates tunneling port
         """