datapath-windows: OvsFindVportByPortIdAndNicIndex() and external port.

We use OvsFindVportByPortIdAndNicIndex() to lookup the vport for a
packte received from the Hyper-V switch. If a packet was indeed received
from the virtual external NIC, we should flag it.

Validation:
1. Install and Uninstall the OVS EXT Driver (without enabling the OVS
   extension on the Hyper-V switch).
2. Install and Uninstall the OVS EXT Driver (with enabling the OVS
   extension on the Hyper-V switch). Hyper-V switch had a few ports.
3. Install and Uninstall the OVS EXT Driver (with enabling the OVS
   extension on the Hyper-V switch). Added a few ports before
   uninstalling.
4. Install the OVS EXT driver, and test the following functionality:
   a) ping between 2 VMs on the same host
   b) ping between 2 VMs on 2 Hyper-Vs - one physical and another
      virtual backed by VLAN (patch port between br-pif and br-int).
   c) ping between 2 VMs on 2 Hyper-Vs - one physical and another
      virtual backed by VXLAN.
   d) Successful uninstallation after these tests.

Signed-off-by: Nithin Raju <nithin@vmware.com>
Acked-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Tested-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Acked-by: Ankur Sharma <ankursharma@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>

datapath-windows/ovsext/Vport.c

@@ -552,9 +552,13 @@ OvsFindVportByPortIdAndNicIndex(POVS_SWITCH_CONTEXT switchContext,
                                 NDIS_SWITCH_PORT_ID portId,
                                 NDIS_SWITCH_NIC_INDEX index)
 {
-    if (portId == switchContext->virtualExternalPortId) {
+    if (switchContext->virtualExternalVport &&
+            portId == switchContext->virtualExternalPortId &&
+            index == switchContext->virtualExternalVport->nicIndex) {
         return (POVS_VPORT_ENTRY)switchContext->virtualExternalVport;
-    } else if (switchContext->internalPortId == portId) {
+    } else if (switchContext->internalVport &&
+               portId == switchContext->internalPortId &&
+               index == switchContext->internalVport->nicIndex) {
         return (POVS_VPORT_ENTRY)switchContext->internalVport;
     } else {
         PLIST_ENTRY head, link;