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>

2 files changed, 54 insertions, 30 deletions

diff --git a/include/net/erspan.h b/include/net/erspan.h
index 6d30fe898286..5daa4866412b 100644
--- a/include/net/erspan.h
+++ b/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)
diff --git a/include/uapi/linux/erspan.h b/include/uapi/linux/erspan.h
new file mode 100644
index 000000000000..841573019ae1
--- /dev/null
+++ b/include/uapi/linux/erspan.h
@@ -0,0 +1,52 @@
+/* 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 */