datapath-windows: Add Datapath.[ch] and OVS_USE_NL_INTERFACE CPP

In this change we create peer to OvsIoctl.[ch] that would interface
with userspace using the netlink interface. The new files are called
Datapath.[ch]. We are not deleting OvsIoctl.[ch] yet. Datapath.[ch]
provides bare minimum functionality to register a pseudo device for
communication with userspace.

We also define a CPP called OVS_USE_NL_INTERFACE in the ovsext project.
This defines if the old interface (pre-netlink based) or the new
interface (netlink- based) should be enabled in the kernel. By default,
the value is 0 since the Datapath.[ch] are minimal. In the next change,
we'll turn it to 1.

Since Datapath.[ch] containes code copied from OvsIoctl.[ch], acking
the original author as well.

Signed-off-by: Nithin Raju <nithin@vmware.com>
Co-authored-by: Guolin Yang <gyang@vmware.com>
Acked-by: Alin Serdean <aserdean@cloudbasesolutions.com>
Acked-by: Ankur Sharma <ankursharma@vmware.com>
Acked-by: Saurabh Shah <ssaurabh@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>

1 files changed, 57 insertions, 0 deletions

diff --git a/datapath-windows/ovsext/Datapath.h b/datapath-windows/ovsext/Datapath.h
new file mode 100644
index 000000000..b68010bcf
--- /dev/null
+++ b/datapath-windows/ovsext/Datapath.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2014 VMware, Inc.
+ *
+ * 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.
+ */
+
+/*
+ * XXX: OVS_USE_NL_INTERFACE is being used to keep the legacy DPIF interface
+ * alive while we transition over to the netlink based interface.
+ * OVS_USE_NL_INTERFACE = 0 => legacy inteface to use with dpif-windows.c
+ * OVS_USE_NL_INTERFACE = 1 => netlink inteface to use with ported dpif-linux.c
+ */
+#if defined OVS_USE_NL_INTERFACE && OVS_USE_NL_INTERFACE == 0
+#include "OvsIoctl.h"
+
+#else
+
+#ifndef __OVS_DATAPATH_H_
+#define __OVS_DATAPATH_H_ 1
+
+typedef struct _OVS_DEVICE_EXTENSION {
+    INT numberOpenInstance;
+    INT pidCount;
+} OVS_DEVICE_EXTENSION, *POVS_DEVICE_EXTENSION;
+
+
+/*
+ * Private context for each handle on the device.
+ */
+typedef struct _OVS_OPEN_INSTANCE {
+    UINT32 cookie;
+    PFILE_OBJECT fileObject;
+    PVOID eventQueue;
+    PVOID packetQueue;
+} OVS_OPEN_INSTANCE, *POVS_OPEN_INSTANCE;
+
+NDIS_STATUS OvsCreateDeviceObject(NDIS_HANDLE ovsExtDriverHandle);
+VOID OvsDeleteDeviceObject();
+
+POVS_OPEN_INSTANCE OvsGetOpenInstance(PFILE_OBJECT fileObject,
+                                      UINT32 dpNo);
+
+NTSTATUS OvsCompleteIrpRequest(PIRP irp, ULONG_PTR infoPtr, NTSTATUS status);
+
+#endif /* __OVS_DATAPATH_H_ */
+
+#endif /* OVS_USE_NL_INTERFACE */