LCOV - code coverage report
Current view: top level - lib/util - crc32c.c (source / functions) Hit Total Coverage
Test: ut_cov_unit.info Lines: 14 15 93.3 %
Date: 2024-12-15 17:27:24 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*   SPDX-License-Identifier: BSD-3-Clause
       2             :  *   Copyright (C) 2017 Intel Corporation.
       3             :  *   All rights reserved.
       4             :  */
       5             : 
       6             : #include "util_internal.h"
       7             : #include "crc_internal.h"
       8             : #include "spdk/crc32.h"
       9             : 
      10             : #ifdef SPDK_HAVE_ISAL
      11             : 
      12             : uint32_t
      13       27830 : spdk_crc32c_update(const void *buf, size_t len, uint32_t crc)
      14             : {
      15       27830 :         return crc32_iscsi((unsigned char *)buf, len, crc);
      16             : }
      17             : 
      18             : #elif defined(SPDK_HAVE_SSE4_2)
      19             : 
      20             : uint32_t
      21             : spdk_crc32c_update(const void *buf, size_t len, uint32_t crc)
      22             : {
      23             :         size_t count_pre, count_post, count_mid;
      24             :         const uint64_t *dword_buf;
      25             :         uint64_t crc_tmp64;
      26             : 
      27             :         /* process the head and tail bytes separately to make the buf address
      28             :          * passed to _mm_crc32_u64 is 8 byte aligned. This can avoid unaligned loads.
      29             :          */
      30             :         count_pre = ((uint64_t)buf & 7) == 0 ? 0 : 8 - ((uint64_t)buf & 7);
      31             :         count_post = (uint64_t)((uintptr_t)buf + len) & 7;
      32             :         count_mid = (len - count_pre - count_post) / 8;
      33             : 
      34             :         while (count_pre--) {
      35             :                 crc = _mm_crc32_u8(crc, *(const uint8_t *)buf);
      36             :                 buf = (uint8_t *)buf + 1;
      37             :         }
      38             : 
      39             :         /* _mm_crc32_u64() needs a 64-bit intermediate value */
      40             :         crc_tmp64 = crc;
      41             :         dword_buf = (const uint64_t *)buf;
      42             : 
      43             :         while (count_mid--) {
      44             :                 crc_tmp64 = _mm_crc32_u64(crc_tmp64, *dword_buf);
      45             :                 dword_buf++;
      46             :         }
      47             : 
      48             :         buf = dword_buf;
      49             :         crc = (uint32_t)crc_tmp64;
      50             :         while (count_post--) {
      51             :                 crc = _mm_crc32_u8(crc, *(const uint8_t *)buf);
      52             :                 buf = (uint8_t *)buf + 1;
      53             :         }
      54             : 
      55             :         return crc;
      56             : }
      57             : 
      58             : #elif defined(SPDK_HAVE_ARM_CRC)
      59             : 
      60             : uint32_t
      61             : spdk_crc32c_update(const void *buf, size_t len, uint32_t crc)
      62             : {
      63             :         size_t count_pre, count_post, count_mid;
      64             :         const uint64_t *dword_buf;
      65             : 
      66             :         /* process the head and tail bytes separately to make the buf address
      67             :          * passed to crc32_cd is 8 byte aligned. This can avoid unaligned loads.
      68             :          */
      69             :         count_pre = ((uint64_t)buf & 7) == 0 ? 0 : 8 - ((uint64_t)buf & 7);
      70             :         count_post = (uint64_t)(buf + len) & 7;
      71             :         count_mid = (len - count_pre - count_post) / 8;
      72             : 
      73             :         while (count_pre--) {
      74             :                 crc = __crc32cb(crc, *(const uint8_t *)buf);
      75             :                 buf++;
      76             :         }
      77             : 
      78             :         dword_buf = (const uint64_t *)buf;
      79             :         while (count_mid--) {
      80             :                 crc = __crc32cd(crc, *dword_buf);
      81             :                 dword_buf++;
      82             :         }
      83             : 
      84             :         buf = dword_buf;
      85             :         while (count_post--) {
      86             :                 crc = __crc32cb(crc, *(const uint8_t *)buf);
      87             :                 buf++;
      88             :         }
      89             : 
      90             :         return crc;
      91             : }
      92             : 
      93             : #else /* Neither SSE 4.2 nor ARM CRC32 instructions available */
      94             : 
      95             : static struct spdk_crc32_table g_crc32c_table;
      96             : 
      97             : __attribute__((constructor)) static void
      98             : crc32c_init(void)
      99             : {
     100             :         crc32_table_init(&g_crc32c_table, SPDK_CRC32C_POLYNOMIAL_REFLECT);
     101             : }
     102             : 
     103             : uint32_t
     104             : spdk_crc32c_update(const void *buf, size_t len, uint32_t crc)
     105             : {
     106             :         return crc32_update(&g_crc32c_table, buf, len, crc);
     107             : }
     108             : 
     109             : #endif
     110             : 
     111             : uint32_t
     112          14 : spdk_crc32c_iov_update(struct iovec *iov, int iovcnt, uint32_t crc32c)
     113             : {
     114          14 :         int i;
     115             : 
     116          14 :         if (iov == NULL) {
     117           0 :                 return crc32c;
     118             :         }
     119             : 
     120          63 :         for (i = 0; i < iovcnt; i++) {
     121          49 :                 assert(iov[i].iov_base != NULL);
     122          49 :                 assert(iov[i].iov_len != 0);
     123          49 :                 crc32c = spdk_crc32c_update(iov[i].iov_base, iov[i].iov_len, crc32c);
     124          49 :         }
     125             : 
     126          14 :         return crc32c;
     127          14 : }
     128             : 
     129             : uint32_t
     130        1752 : spdk_crc32c_nvme(const void *buf, size_t len, uint32_t crc)
     131             : {
     132        1752 :         return ~(spdk_crc32c_update(buf, len, ~crc));
     133             : }

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