datapath-windows: Add WMI Script that updates Hyper-V friendly port names.

The following script leverage's the advantages of WMI infrastructure
offered in Hyper-V.

This scripts allows the user to change the
Msvm_EthernetPortAllocationSettingData property of a VM network adapter
connected to a Hyper-V Virtual Switch.

Usage:
import-module .\OVS.psm1
$vnic = Get-VMNetworkAdapter VM1
Connect-VMNetworkAdapter -VMNetworkAdapter $vnic -SwitchName external
$vnic | Set-VMNetworkAdapterOVSPort -OVSPortName ovs-port-1

VM1 - is a VM on top of a Hyper-V
external - is a Hyper-V Virtual Switch

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

diff --git a/datapath-windows/misc/OVS.psm1 b/datapath-windows/misc/OVS.psm1
new file mode 100644 (file)
index 0000000..52ed3ba
--- /dev/null
+++ b/datapath-windows/misc/OVS.psm1
@@ -0,0 +1,76 @@
+<#
+Copyright 2014 Cloudbase Solutions Srl
+
+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.
+#>
+
+$hvassembly = [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.HyperV.PowerShell")
+
+function Set-VMNetworkAdapterOVSPort
+{
+    [CmdletBinding()]
+    param
+    (
+        [parameter(Mandatory=$true, ValueFromPipeline=$true)]
+        [Microsoft.HyperV.PowerShell.VMNetworkAdapter]$VMNetworkAdapter,
+
+        [parameter(Mandatory=$true)]
+        [string]$OVSPortName
+    )
+    process
+    {
+        $ns = "root\virtualization\v2"
+        $EscapedId = $VMNetworkAdapter.Id.Replace('\', '\\')
+        $sd = gwmi -namespace $ns -class Msvm_EthernetPortAllocationSettingData -Filter "InstanceId like '$EscapedId%'"
+
+        if($sd)
+        {
+            $sd.ElementName = $OVSPortName
+
+            $vsms = gwmi -namespace $ns -class Msvm_VirtualSystemManagementService
+            $retVal = $vsms.ModifyResourceSettings(@($sd.GetText(1)))
+            try
+            {
+                Check-WMIReturnValue $retVal
+            }
+            catch
+            {
+                throw "Assigning OVS port '$OVSPortName' failed"
+            }
+        }
+    }
+}
+
+function Check-WMIReturnValue($retVal)
+{
+    if ($retVal.ReturnValue -ne 0)
+    {
+        if ($retVal.ReturnValue -eq 4096)
+        {
+            do
+            {
+                $job = [wmi]$retVal.Job
+            }
+            while ($job.JobState -eq 4)
+
+            if ($job.JobState -ne 7)
+            {
+                throw "Job Failed"
+            }
+        }
+        else
+        {
+            throw "Job Failed"
+        }
+    }
+}