net: erspan: create erspan metadata uapi header

The patch adds a new uapi header file, erspan.h, and moves
the 'struct erspan_metadata' from internal erspan.h to it.
Signed-off-by: William Tu <u9012063@gmail.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/erspan.h

@@ -46,6 +46,8 @@
  * GRE proto ERSPAN type II = 0x88BE, type III = 0x22EB
  */
 
+#include <uapi/linux/erspan.h>
+
 #define ERSPAN_VERSION	0x1	/* ERSPAN type II */
 #define VER_MASK	0xf000
 #define VLAN_MASK	0x0fff
@@ -68,29 +70,6 @@
 #define HWID_OFFSET    4
 #define DIR_OFFSET     3
 
-/* ERSPAN version 2 metadata header */
-struct erspan_md2 {
-	__be32 timestamp;
-	__be16 sgt;	/* security group tag */
-#if defined(__LITTLE_ENDIAN_BITFIELD)
-	__u8	hwid_upper:2,
-		ft:5,
-		p:1;
-	__u8	o:1,
-		gra:2,
-		dir:1,
-		hwid:4;
-#elif defined(__BIG_ENDIAN_BITFIELD)
-	__u8	p:1,
-		ft:5,
-		hwid_upper:2;
-	__u8	hwid:4,
-		dir:1,
-		gra:2,
-		o:1;
-#endif
-};
-
 enum erspan_encap_type {
 	ERSPAN_ENCAP_NOVLAN = 0x0,	/* originally without VLAN tag */
 	ERSPAN_ENCAP_ISL = 0x1,		/* originally ISL encapsulated */
@@ -100,13 +79,6 @@ enum erspan_encap_type {
 
 #define ERSPAN_V1_MDSIZE	4
 #define ERSPAN_V2_MDSIZE	8
-struct erspan_metadata {
-	union {
-		__be32 index;		/* Version 1 (type II)*/
-		struct erspan_md2 md2;	/* Version 2 (type III) */
-	} u;
-	int version;
-};
 
 struct erspan_base_hdr {
 #if defined(__LITTLE_ENDIAN_BITFIELD)

include/uapi/linux/erspan.h

+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * ERSPAN Tunnel Metadata
+ *
+ * Copyright (c) 2018 VMware
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * Userspace API for metadata mode ERSPAN tunnel
+ */
+#ifndef _UAPI_ERSPAN_H
+#define _UAPI_ERSPAN_H
+
+#include <linux/types.h>	/* For __beXX in userspace */
+#include <asm/byteorder.h>
+
+/* ERSPAN version 2 metadata header */
+struct erspan_md2 {
+	__be32 timestamp;
+	__be16 sgt;	/* security group tag */
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+	__u8	hwid_upper:2,
+		ft:5,
+		p:1;
+	__u8	o:1,
+		gra:2,
+		dir:1,
+		hwid:4;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+	__u8	p:1,
+		ft:5,
+		hwid_upper:2;
+	__u8	hwid:4,
+		dir:1,
+		gra:2,
+		o:1;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+};
+
+struct erspan_metadata {
+	int version;
+	union {
+		__be32 index;		/* Version 1 (type II)*/
+		struct erspan_md2 md2;	/* Version 2 (type III) */
+	} u;
+};
+
+#endif /* _UAPI_ERSPAN_H */