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>

1 files changed, 52 insertions, 0 deletions

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 */