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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 18:24:20 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 18:24:20 +0000
commit483eb2f56657e8e7f419ab1a4fab8dce9ade8609 (patch)
treee5d88d25d870d5dedacb6bbdbe2a966086a0a5cf /src/spdk/lib/util/crc32c.c
parentInitial commit. (diff)
downloadceph-upstream.tar.xz
ceph-upstream.zip
Adding upstream version 14.2.21.upstream/14.2.21upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/spdk/lib/util/crc32c.c')
-rw-r--r--src/spdk/lib/util/crc32c.c89
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