Restructure code to support both md-type1 and md-type2

Basic support to both MD1 and MD2
MD1 configuration:
create nsh entry nsp 185 nsi 255 md-type 1 c1 1 c2 2 c3 3 c4 4 next-ethernet

MD2 configuration:
create nsh entry nsp 185 nsi 254 md-type 2 pot next-ethernet

Change-Id: Ide0fdc122d76cb6a55643a15febd985bd41981b0
Signed-off-by: Hongjun Ni <hongjun.ni@intel.com>
Signed-off-by: Vengada <venggovi@cisco.com>

1 files changed, 22 insertions, 3 deletions

diff --git a/nsh-plugin/nsh/nsh_packet.h b/nsh-plugin/nsh/nsh_packet.h
index 553fc0b..101652a 100644
--- a/nsh-plugin/nsh/nsh_packet.h
+++ b/nsh-plugin/nsh/nsh_packet.h
@@ -74,11 +74,30 @@ typedef CLIB_PACKED(struct {
   u8 md_type;
   u8 next_protocol;
   u32 nsp_nsi; // nsp 24 bits, nsi 8 bits
+}) nsh_base_header_t;
+
+typedef CLIB_PACKED(struct {
   /* Context headers, always present */
-  u32 c1; u32 c2; u32 c3; u32 c4;
+  u32 c1;
+  u32 c2;
+  u32 c3;
+  u32 c4;
+}) nsh_md1_data_t;
 
-  /* Optional variable length metadata */
-  u32 tlvs[0];
+typedef CLIB_PACKED(struct {
+  u16 class;
+  u8 type;
+  u8 length;
+}) nsh_tlv_header_t;
+
+typedef nsh_tlv_header_t nsh_md2_data_t;
+
+typedef CLIB_PACKED(struct {
+  nsh_base_header_t nsh_base;
+  union {
+     nsh_md1_data_t md1_data;
+     nsh_md2_data_t md2_data;
+   } md;
 }) nsh_header_t;
 
 #define NSH_VERSION (0<<6)