vlib: refactor checksum offload support

Type: refactor

This patch refactors the offload flags in vlib_buffer_t.
There are two main reasons behind this refactoring.
First, offload flags are insufficient to represent outer
and inner headers offloads. Second, room for these flags
in first cacheline of vlib_buffer_t is also limited.

This patch introduces a generic offload flag in first
cacheline. And detailed offload flags in 2nd cacheline
of the structure for performance optimization.

Change-Id: Icc363a142fb9208ec7113ab5bbfc8230181f6004
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>

1 files changed, 27 insertions, 1 deletions

diff --git a/src/vnet/interface_format.c b/src/vnet/interface_format.c
index dc2edff7c67..036ca53174c 100644
--- a/src/vnet/interface_format.c
+++ b/src/vnet/interface_format.c
@@ -722,7 +722,7 @@ unformat_vnet_buffer_flags (unformat_input_t * input, va_list * args)
   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
     {
       /* Red herring, there is no such buffer flag */
-      if (unformat (input, "avail8"))
+      if (unformat (input, "avail10"))
 	return 0;
 #define _(bit,enum,str,verbose)                                 \
       else if (unformat (input, str))                           \
@@ -741,6 +741,32 @@ unformat_vnet_buffer_flags (unformat_input_t * input, va_list * args)
 }
 
 uword
+unformat_vnet_buffer_offload_flags (unformat_input_t *input, va_list *args)
+{
+  u32 *flagp = va_arg (*args, u32 *);
+  int rv = 0;
+  u32 oflags = 0;
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (0)
+	;
+#define _(bit, enum, str, verbose)                                            \
+  else if (unformat (input, str))                                             \
+  {                                                                           \
+    oflags |= (1 << bit);                                                     \
+    rv = 1;                                                                   \
+  }
+      foreach_vnet_buffer_offload_flag
+#undef _
+	else break;
+    }
+  if (rv)
+    *flagp = oflags;
+  return rv;
+}
+
+uword
 unformat_vnet_hw_interface (unformat_input_t * input, va_list * args)
 {
   vnet_main_t *vnm = va_arg (*args, vnet_main_t *);