From 271daab9677a5c611b203379fc6fb9022f53f09c Mon Sep 17 00:00:00 2001
From: Damjan Marion <damarion@cisco.com>
Date: Fri, 12 Nov 2021 16:00:24 +0100
Subject: hash: refactor crc32_5tuple

Type: improvement
Change-Id: I31cae2367e2ec7fc89991ca0df994a73da93aaed
Signed-off-by: Damjan Marion <damarion@cisco.com>
---
 src/vppinfra/crc32.h        | 80 ++++++++++++++++++++++++++-------------------
 src/vppinfra/lb_hash_hash.h | 14 ++++----
 2 files changed, 54 insertions(+), 40 deletions(-)

(limited to 'src/vppinfra')

diff --git a/src/vppinfra/crc32.h b/src/vppinfra/crc32.h
index fec67cd9757..3b81daf28ca 100644
--- a/src/vppinfra/crc32.h
+++ b/src/vppinfra/crc32.h
@@ -21,67 +21,81 @@
 #if __SSE4_2__
 #define clib_crc32c_uses_intrinsics
 #include <x86intrin.h>
-
-#define crc32_u64 _mm_crc32_u64
-#define crc32_u32 _mm_crc32_u32
-
 static_always_inline u32
-clib_crc32c (u8 * s, int len)
+clib_crc32c_u8 (u32 last, u8 data)
 {
-  u32 v = 0;
-
-#if defined(__x86_64__)
-  for (; len >= 8; len -= 8, s += 8)
-    v = _mm_crc32_u64 (v, *((u64 *) s));
-#else
-  /* workaround weird GCC bug when using _mm_crc32_u32
-     which happens with -O2 optimization */
-#if !defined (__i686__)
-  asm volatile ("":::"memory");
-#endif
-#endif
-
-  for (; len >= 4; len -= 4, s += 4)
-    v = _mm_crc32_u32 (v, *((u32 *) s));
+  return _mm_crc32_u8 (last, data);
+}
 
-  for (; len >= 2; len -= 2, s += 2)
-    v = _mm_crc32_u16 (v, *((u16 *) s));
+static_always_inline u32
+clib_crc32c_u16 (u32 last, u16 data)
+{
+  return _mm_crc32_u16 (last, data);
+}
 
-  for (; len >= 1; len -= 1, s += 1)
-    v = _mm_crc32_u8 (v, *((u16 *) s));
+static_always_inline u32
+clib_crc32c_u32 (u32 last, u32 data)
+{
+  return _mm_crc32_u32 (last, data);
+}
 
-  return v;
+static_always_inline u32
+clib_crc32c_u64 (u32 last, u64 data)
+{
+  return _mm_crc32_u64 (last, data);
 }
+#endif
 
-#elif __ARM_FEATURE_CRC32
+#if __ARM_FEATURE_CRC32
 #define clib_crc32c_uses_intrinsics
 #include <arm_acle.h>
+static_always_inline u32
+clib_crc32c_u8 (u32 last, u8 data)
+{
+  return __crc32cd (last, data);
+}
 
+static_always_inline u32
+clib_crc32c_u16 (u32 last, u16 data)
+{
+  return __crc32ch (last, data);
+}
 
-#define crc32_u64 __crc32cd
-#define crc32_u32 __crc32cw
+static_always_inline u32
+clib_crc32c_u32 (u32 last, u32 data)
+{
+  return __crc32cw (last, data);
+}
 
+static_always_inline u32
+clib_crc32c_u64 (u32 last, u64 data)
+{
+  return __crc32cd (last, data);
+}
+#endif
+
+#ifdef clib_crc32c_uses_intrinsics
 static_always_inline u32
 clib_crc32c (u8 * s, int len)
 {
   u32 v = 0;
 
   for (; len >= 8; len -= 8, s += 8)
-    v = __crc32cd (v, *((u64 *) s));
+    v = clib_crc32c_u64 (v, *((u64u *) s));
 
   for (; len >= 4; len -= 4, s += 4)
-    v = __crc32cw (v, *((u32 *) s));
+    v = clib_crc32c_u32 (v, *((u32u *) s));
 
   for (; len >= 2; len -= 2, s += 2)
-    v = __crc32ch (v, *((u16 *) s));
+    v = clib_crc32c_u16 (v, *((u16u *) s));
 
   for (; len >= 1; len -= 1, s += 1)
-    v = __crc32cb (v, *((u8 *) s));
+    v = clib_crc32c_u8 (v, *((u8 *) s));
 
   return v;
 }
-
 #endif
+
 #endif /* __included_crc32_h__ */
 
 /*
diff --git a/src/vppinfra/lb_hash_hash.h b/src/vppinfra/lb_hash_hash.h
index fb251591eeb..f355515bce4 100644
--- a/src/vppinfra/lb_hash_hash.h
+++ b/src/vppinfra/lb_hash_hash.h
@@ -24,11 +24,11 @@ static_always_inline u32
 lb_hash_hash (u64 k0, u64 k1, u64 k2, u64 k3, u64 k4)
 {
   u64 val = 0;
-  val = crc32_u64 (val, k0);
-  val = crc32_u64 (val, k1);
-  val = crc32_u64 (val, k2);
-  val = crc32_u64 (val, k3);
-  val = crc32_u64 (val, k4);
+  val = clib_crc32c_u64 (val, k0);
+  val = clib_crc32c_u64 (val, k1);
+  val = clib_crc32c_u64 (val, k2);
+  val = clib_crc32c_u64 (val, k3);
+  val = clib_crc32c_u64 (val, k4);
   return (u32) val;
 }
 
@@ -37,8 +37,8 @@ static_always_inline u32
 lb_hash_hash_2_tuples (u64 k0, u32 k1)
 {
   u64 val = 0;
-  val = crc32_u64 (val, k0);
-  val = crc32_u32 (val, k1);
+  val = clib_crc32c_u64 (val, k0);
+  val = clib_crc32c_u32 (val, k1);
   return (u32) val;
 }
 #else
-- 
cgit 1.2.3-korg