Move the loongarch CRC32 assembly code into the lib directory and wire
it up to the library interface. This allows it to be used without going
through the crypto API. It remains usable via the crypto API too via
the shash algorithms that use the library interface. Thus all the
arch-specific "shash" code becomes unnecessary and is removed.
Note: to see the diff from arch/loongarch/crypto/crc32-loongarch.c to
arch/loongarch/lib/crc32-loongarch.c, view this commit with
'git show -M10'.
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: WangYuli <wangyuli@uniontech.com>
Link: https://lore.kernel.org/r/20241202010844.144356-7-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
With a blatant copy of some MIPS bits we introduce the crc32 and crc32c
hw accelerated module to LoongArch.
LoongArch has provided these instructions to calculate crc32 and crc32c:
* crc.w.b.w crcc.w.b.w
* crc.w.h.w crcc.w.h.w
* crc.w.w.w crcc.w.w.w
* crc.w.d.w crcc.w.d.w
So we can make use of these instructions to improve the performance of
calculation for crc32(c) checksums.
As can be seen from the following test results, crc32(c) instructions
can improve the performance by 58%.
Software implemention Hardware acceleration
Buffer size time cost (seconds) time cost (seconds) Accel.
100 KB 0.000845 0.000534 59.1%
1 MB 0.007758 0.004836 59.4%
10 MB 0.076593 0.047682 59.4%
100 MB 0.756734 0.479126 58.5%
1000 MB 7.563841 4.778266 58.5%
Signed-off-by: Min Zhou <zhoumin@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
