[ofw] [RFC] [PATCH 1/4] rdma/verbs: define rdma verbs interface

[Sean Hefty]

Wrap the ci_interface_t into an interface structure that upper level
drivers can query for.  Rather than HCA drivers calling to register
the interface, interested drivers will instead query the HCA driver
for a given interface.  The HCA driver will respond to the query
interface IOCTL by filling in the appropriate interface calls.

This behavior better matches the intent of exposing driver interfaces
on Windows, and allows different HCA drivers to support different
interfaces.

Signed-off-by: Sean Hefty <sean.hefty at intel.com>
---
One of the long term goals here is that drivers can develop and support
interfaces independent from one another.  For example, a new interface
could be defined to support XRC.  The new interface would have its own
interface structure and GUID.


Index: rdma/verbs.h
===================================================================
--- rdma/verbs.h	(revision 0)
+++ rdma/verbs.h	(revision 0)
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 1996-2008 Intel Corporation. All rights reserved.
+ *
+ * This software is available to you under the OpenIB.org BSD license
+ * below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AWV
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#pragma once
+
+#ifndef _VERBS_H_
+#define _VERBS_H_
+
+#include <initguid.h>
+#include <iba/ib_ci.h>
+
+static inline USHORT VerbsVersion(UINT8 Major, UINT8 Minor)
+{
+	return ((USHORT) Major << 8) | ((USHORT) Minor);
+}
+
+static inline UINT8 VerbsVersionMajor(USHORT Version)
+{
+	return (UINT8) (Version >> 8);
+}
+
+static inline UINT8 VerbsVersionMinor(USHORT Version)
+{
+	return (UINT8) Version;
+}
+
+DEFINE_GUID(GUID_RDMA_INTERFACE_VERBS, 0xf0ebae86, 0xedb5, 0x4b40,
+			0xa1, 0xa, 0x44, 0xd5, 0xdb, 0x3b, 0x96, 0x4e);
+
+typedef struct _RDMA_INTERFACE_VERBS
+{
+	INTERFACE		InterfaceHeader;
+	ci_interface_t	Verbs;
+
+}	RDMA_INTERFACE_VERBS;
+
+#endif // _VERBS_H_