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btrfs-progs: crypto: unify naming of crc32c implementations

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Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2023-09-14 20:31:31 +02:00
parent 78c227e7d2
commit 7db445a3de
1 changed files with 15 additions and 15 deletions
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30
crypto/crc32c.c
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@ -13,8 +13,8 @@
#include "crypto/crc32c.h"
#include "common/cpu-utils.h"
static uint32_t __crc32c_le(uint32_t crc, unsigned char const *data, uint32_t length);
static uint32_t (*crc_function)(uint32_t crc, unsigned char const *data, uint32_t length) = __crc32c_le;
static uint32_t crc32c_ref(uint32_t crc, unsigned char const *data, uint32_t length);
static uint32_t (*crc32c_impl)(uint32_t crc, unsigned char const *data, uint32_t length) = crc32c_ref;
#ifdef __x86_64__
@ -61,10 +61,11 @@ static uint32_t crc32c_intel_le_hw_byte(uint32_t crc, unsigned char const *data,
}
/*
* Steps through buffer one byte at at time, calculates reflected
* crc using table.
* Accelerated implementation using SSE 4.2 extension for instruction crc32c.
* Steps through buffer one byte at at time, calculates reflected crc using
* table.
*/
static uint32_t crc32c_intel(uint32_t crc, unsigned char const *data, uint32_t length)
static uint32_t crc32c_sse42(uint32_t crc, unsigned char const *data, uint32_t length)
{
unsigned int iquotient = length / SCALE_F;
unsigned int iremainder = length % SCALE_F;
@ -96,14 +97,14 @@ void crc32c_init_accel(void)
#ifdef __GLIBC__
} else if (cpu_has_feature(CPU_FLAG_PCLMUL)) {
/* printf("CRC32C: pcl\n"); */
crc_function = crc32c_pcl;
crc32c_impl = crc32c_pcl;
#endif
} else if (cpu_has_feature(CPU_FLAG_SSE42)) {
/* printf("CRC32c: intel\n"); */
crc_function = crc32c_intel;
crc32c_impl = crc32c_sse42;
} else {
/* printf("CRC32c: fallback\n"); */
crc_function = __crc32c_le;
crc32c_impl = crc32c_ref;
}
}
@ -111,7 +112,7 @@ void crc32c_init_accel(void)
void crc32c_init_accel(void)
{
crc_function = __crc32c_le;
crc32c_impl = crc32c_ref;
}
#endif /* __x86_64__ */
@ -193,11 +194,10 @@ static const uint32_t crc32c_table[256] = {
};
/*
* Steps through buffer one byte at at time, calculates reflected crc using
* table.
* Fallback implementatin. Step through buffer one byte at at time, calculates
* reflected crc using table, can accept an unaligned buffer.
*/
static uint32_t __crc32c_le(uint32_t crc, unsigned char const *data, uint32_t length)
static uint32_t crc32c_ref(uint32_t crc, unsigned char const *data, uint32_t length)
{
while (length--)
crc =
@ -209,7 +209,7 @@ uint32_t crc32c_le(uint32_t crc, unsigned char const *data, uint32_t length)
{
/* Use by-byte access for unaligned buffers */
if ((unsigned long)data % sizeof(unsigned long))
return __crc32c_le(crc, data, length);
return crc32c_ref(crc, data, length);
return crc_function(crc, data, length);
return crc32c_impl(crc, data, length);
}