smb: smbdirect: add smbdirect.h with public structures

[ Upstream commit 7e136a718633b2c54764e185f3bfccf0763fc1dd ]

Will be used in client and server in the next commits.

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Hyunchul Lee <hyc.lee@gmail.com>
CC: Meetakshi Setiya <meetakshisetiyaoss@gmail.com>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Stable-dep-of: 43e7e284fc77 ("cifs: Fix the smbd_response slab to allow usercopy")
Signed-off-by: Sasha Levin <sashal@kernel.org>

fs/smb/common/smbdirect/smbdirect.h

@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *   Copyright (C) 2017, Microsoft Corporation.
+ *   Copyright (C) 2018, LG Electronics.
+ */
+
+#ifndef __FS_SMB_COMMON_SMBDIRECT_SMBDIRECT_H__
+#define __FS_SMB_COMMON_SMBDIRECT_SMBDIRECT_H__
+
+/* SMB-DIRECT buffer descriptor V1 structure [MS-SMBD] 2.2.3.1 */
+struct smbdirect_buffer_descriptor_v1 {
+	__le64 offset;
+	__le32 token;
+	__le32 length;
+} __packed;
+
+#endif /* __FS_SMB_COMMON_SMBDIRECT_SMBDIRECT_H__ */