b961d9cc12
Change-Id: I6a142feeaad3117bd3c75e7c5cb7231a1cfa78ae Signed-off-by: Ben Walker <benjamin.walker@intel.com>
131 lines
3.5 KiB
C
131 lines
3.5 KiB
C
/*-
|
|
* BSD LICENSE
|
|
*
|
|
* Copyright (C) 2008-2012 Daisuke Aoyama <aoyama@peach.ne.jp>.
|
|
* 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/stdinc.h"
|
|
|
|
#include "iscsi/iscsi.h"
|
|
#include "iscsi/crc32c.h"
|
|
|
|
#ifndef USE_ISAL
|
|
#define SPDK_USE_CRC32C_TABLE
|
|
#endif
|
|
|
|
#ifdef SPDK_USE_CRC32C_TABLE
|
|
static uint32_t spdk_crc32c_table[256];
|
|
|
|
__attribute__((constructor)) static void
|
|
spdk_init_crc32c(void)
|
|
{
|
|
int i, j;
|
|
uint32_t val;
|
|
|
|
for (i = 0; i < 256; i++) {
|
|
val = i;
|
|
for (j = 0; j < 8; j++) {
|
|
if (val & 1) {
|
|
val = (val >> 1) ^ SPDK_CRC32C_POLYNOMIAL_REFLECT;
|
|
} else {
|
|
val = (val >> 1);
|
|
}
|
|
}
|
|
spdk_crc32c_table[i] = val;
|
|
}
|
|
}
|
|
#endif /* SPDK_USE_CRC32C_TABLE */
|
|
|
|
|
|
#ifndef USE_ISAL
|
|
uint32_t
|
|
spdk_update_crc32c(const uint8_t *buf, size_t len, uint32_t crc)
|
|
{
|
|
size_t s;
|
|
#ifndef SPDK_USE_CRC32C_TABLE
|
|
int i;
|
|
uint32_t val;
|
|
#endif /* SPDK_USE_CRC32C_TABLE */
|
|
|
|
for (s = 0; s < len; s++) {
|
|
#ifdef SPDK_USE_CRC32C_TABLE
|
|
crc = (crc >> 8) ^ spdk_crc32c_table[(crc ^ buf[s]) & 0xff];
|
|
#else
|
|
val = buf[s];
|
|
for (i = 0; i < 8; i++) {
|
|
if ((crc ^ val) & 1) {
|
|
crc = (crc >> 1) ^ SPDK_CRC32C_POLYNOMIAL_REFLECT;
|
|
} else {
|
|
crc = (crc >> 1);
|
|
}
|
|
val = val >> 1;
|
|
}
|
|
#endif /* SPDK_USE_CRC32C_TABLE */
|
|
}
|
|
return crc;
|
|
}
|
|
#endif /* USE_ISAL */
|
|
|
|
uint32_t
|
|
spdk_fixup_crc32c(size_t total, uint32_t crc)
|
|
{
|
|
uint8_t padding[ISCSI_ALIGNMENT];
|
|
size_t pad_length;
|
|
size_t rest;
|
|
|
|
if (total == 0)
|
|
return crc;
|
|
rest = total % ISCSI_ALIGNMENT;
|
|
if (rest != 0) {
|
|
pad_length = ISCSI_ALIGNMENT;
|
|
pad_length -= rest;
|
|
if (pad_length > 0 && pad_length < sizeof padding) {
|
|
memset(padding, 0, sizeof padding);
|
|
crc = spdk_update_crc32c(padding, pad_length, crc);
|
|
}
|
|
}
|
|
return crc;
|
|
}
|
|
|
|
uint32_t
|
|
spdk_crc32c(const uint8_t *buf, size_t len)
|
|
{
|
|
uint32_t crc32c;
|
|
|
|
crc32c = SPDK_CRC32C_INITIAL;
|
|
crc32c = spdk_update_crc32c(buf, len, crc32c);
|
|
if ((len % ISCSI_ALIGNMENT) != 0) {
|
|
crc32c = spdk_fixup_crc32c(len, crc32c);
|
|
}
|
|
crc32c = crc32c ^ SPDK_CRC32C_XOR;
|
|
return crc32c;
|
|
}
|