[PATCH] net:mctp: split mctp hdr version to ver and rsvd

[wit_yuan <yuanzhaoming901030@126.com>]

From: yuanzhaoming <yuanzm2@lenovo.com>

from spec dsp0236_1.2.1.pdf page 26, the mctp header contains the
RSVD(4bit) and Hdr version(4 bit).

mctp_pkttype_receive invoke mctp_hdr, and get mh->ver whole byte 
compare the MCTP_VER_MIN, MCTP_VER_MAX. the reserver bits may be
by misleading used.

Signed-off-by: yuanzhaoming <yuanzm2@lenovo.com>
---
 include/net/mctp.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/net/mctp.h b/include/net/mctp.h
index e1e0a69afdce..80cc9c63f6ba 100644
--- a/include/net/mctp.h
+++ b/include/net/mctp.h
@@ -14,10 +14,17 @@
 #include <linux/netdevice.h>
 #include <net/net_namespace.h>
 #include <net/sock.h>
+#include <asm/byteorder.h>
 
 /* MCTP packet definitions */
 struct mctp_hdr {
-	u8	ver;
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+	u8	ver:4, rsvd: 4;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+	u8	rsvd:4, ver: 4;
+#else
+#error	"Please fix <asm/byteorder.h>"
+#endif
 	u8	dest;
 	u8	src;
 	u8	flags_seq_tag;
-- 
2.49.0