cnat: Add sctp support

This patch adds SCTP support in the CNat translation primitives.
It also exposes a clib_crc32c_with_init function allowing to set
the init value to start the crc32 with instead of 0.

Type: feature

Change-Id: I86add4cfcac08f2a5a34d1e1841122fafd349fe7
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>

1 files changed, 12 insertions, 8 deletions

diff --git a/src/vppinfra/crc32.h b/src/vppinfra/crc32.h
index 3b81daf28ca..2b20fef9027 100644
--- a/src/vppinfra/crc32.h
+++ b/src/vppinfra/crc32.h
@@ -76,23 +76,27 @@ clib_crc32c_u64 (u32 last, u64 data)
 
 #ifdef clib_crc32c_uses_intrinsics
 static_always_inline u32
-clib_crc32c (u8 * s, int len)
+clib_crc32c_with_init (u8 *s, int len, u32 last)
 {
-  u32 v = 0;
-
   for (; len >= 8; len -= 8, s += 8)
-    v = clib_crc32c_u64 (v, *((u64u *) s));
+    last = clib_crc32c_u64 (last, *((u64u *) s));
 
   for (; len >= 4; len -= 4, s += 4)
-    v = clib_crc32c_u32 (v, *((u32u *) s));
+    last = clib_crc32c_u32 (last, *((u32u *) s));
 
   for (; len >= 2; len -= 2, s += 2)
-    v = clib_crc32c_u16 (v, *((u16u *) s));
+    last = clib_crc32c_u16 (last, *((u16u *) s));
 
   for (; len >= 1; len -= 1, s += 1)
-    v = clib_crc32c_u8 (v, *((u8 *) s));
+    last = clib_crc32c_u8 (last, *((u8 *) s));
+
+  return last;
+}
 
-  return v;
+static_always_inline u32
+clib_crc32c (u8 *s, int len)
+{
+  return clib_crc32c_with_init (s, len, 0);
 }
 #endif