From feaf7a15cf142c2b96f08b3914ab768b36b4002e Mon Sep 17 00:00:00 2001
From: Vitaliy Filippov <vitalif@yourcmc.ru>
Date: Sun, 10 Aug 2025 16:32:52 +0300
Subject: [PATCH] Use CRC32C implementation from ISA-L when available - enables
 VPCLMULQDQ version with AVX512 which is ~2x faster

---
 src/blockstore/CMakeLists.txt |  1 +
 src/disk_tool/CMakeLists.txt  |  1 +
 src/util/crc32c.c             | 13 +++++++++++++
 3 files changed, 15 insertions(+)

diff --git a/src/blockstore/CMakeLists.txt b/src/blockstore/CMakeLists.txt
index b2e41581..34cc071c 100644
--- a/src/blockstore/CMakeLists.txt
+++ b/src/blockstore/CMakeLists.txt
@@ -9,6 +9,7 @@ add_library(vitastor_blk SHARED
 )
 target_link_libraries(vitastor_blk
 	${LIBURING_LIBRARIES}
+	${ISAL_LIBRARIES}
 	tcmalloc_minimal
 	# for timerfd_manager
 	vitastor_common
diff --git a/src/disk_tool/CMakeLists.txt b/src/disk_tool/CMakeLists.txt
index 3d238022..6aa55d02 100644
--- a/src/disk_tool/CMakeLists.txt
+++ b/src/disk_tool/CMakeLists.txt
@@ -12,4 +12,5 @@ add_executable(vitastor-disk
 target_link_libraries(vitastor-disk
 	tcmalloc_minimal
 	${LIBURING_LIBRARIES}
+	${ISAL_LIBRARIES}
 )
diff --git a/src/util/crc32c.c b/src/util/crc32c.c
index 6b658c3b..ab9da5f7 100644
--- a/src/util/crc32c.c
+++ b/src/util/crc32c.c
@@ -39,6 +39,17 @@
 #include <unistd.h>
 #include "crc32c.h"
 
+#ifdef WITH_ISAL
+
+#include <isa-l/crc.h>
+
+uint32_t crc32c(uint32_t crc, const void *buf, size_t len)
+{
+    return crc32_iscsi((unsigned char*)buf, len, crc ^ 0xffffffff) ^ 0xffffffff;
+}
+
+#else
+
 /* CRC-32C (iSCSI) polynomial in reversed bit order. */
 #define POLY 0x82f63b78
 
@@ -377,6 +388,8 @@ uint32_t crc32c(uint32_t crc, const void *buf, size_t len)
 #endif
 }
 
+#endif
+
 static uint8_t zero_page[4096] = {};
 
 uint32_t crc32c_pad(uint32_t prev_crc, const void *buf, size_t len, size_t left_pad, size_t right_pad)