1 files changed, 89 insertions, 0 deletions
diff --git a/src/spdk/lib/util/crc32c.c b/src/spdk/lib/util/crc32c.c
new file mode 100644
index 00000000..e95283b3
--- /dev/null
+++ b/src/spdk/lib/util/crc32c.c
@@ -0,0 +1,89 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright (c) Intel Corporation.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "spdk/crc32.h"
+
+#if defined(__x86_64__) && defined(__SSE4_2__)
+#include <x86intrin.h>
+
+uint32_t
+spdk_crc32c_update(const void *buf, size_t len, uint32_t crc)
+{
+	uint64_t crc_tmp64;
+	size_t count;
+
+	/* _mm_crc32_u64() needs a 64-bit intermediate value */
+	crc_tmp64 = crc;
+
+	/* Process as much of the buffer as possible in 64-bit blocks. */
+	count = len / 8;
+	while (count--) {
+		uint64_t block;
+
+		/*
+		 * Use memcpy() to avoid unaligned loads, which are undefined behavior in C.
+		 * The compiler will optimize out the memcpy() in release builds.
+		 */
+		memcpy(&block, buf, sizeof(block));
+		crc_tmp64 = _mm_crc32_u64(crc_tmp64, block);
+		buf += sizeof(block);
+	}
+	crc = (uint32_t)crc_tmp64;
+
+	/* Handle any trailing bytes. */
+	count = len & 7;
+	while (count--) {
+		crc = _mm_crc32_u8(crc, *(const uint8_t *)buf);
+		buf++;
+	}
+
+	return crc;
+}
+
+#else /* SSE 4.2 (CRC32 instruction) not available */
+
+static struct spdk_crc32_table g_crc32c_table;
+
+__attribute__((constructor)) static void
+spdk_crc32c_init(void)
+{
+	spdk_crc32_table_init(&g_crc32c_table, SPDK_CRC32C_POLYNOMIAL_REFLECT);
+}
+
+uint32_t
+spdk_crc32c_update(const void *buf, size_t len, uint32_t crc)
+{
+	return spdk_crc32_update(&g_crc32c_table, buf, len, crc);
+}
+
+#endif