LoongArch: crypto: Add crc32 and crc32c hw acceleration

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>

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/loongarch/crypto/Kconfig b/arch/loongarch/crypto/Kconfig
new file mode 100644
index 000000000000..200a6e8b43b1
--- /dev/null
+++ b/arch/loongarch/crypto/Kconfig
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0
+
+menu "Accelerated Cryptographic Algorithms for CPU (loongarch)"
+
+config CRYPTO_CRC32_LOONGARCH
+	tristate "CRC32c and CRC32"
+	select CRC32
+	select CRYPTO_HASH
+	help
+	  CRC32c and CRC32 CRC algorithms
+
+	  Architecture: LoongArch with CRC32 instructions
+
+endmenu