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>
This commit is contained in:
Min Zhou
Huacai Chen
parent
69e3a6aa6b
commit
2f16482202
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@ -115,6 +115,8 @@ endif
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libs-y += arch/loongarch/lib/
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libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
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drivers-y += arch/loongarch/crypto/
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# suspend and hibernation support
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drivers-$(CONFIG_PM) += arch/loongarch/power/
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@ -0,0 +1,14 @@
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# SPDX-License-Identifier: GPL-2.0
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menu "Accelerated Cryptographic Algorithms for CPU (loongarch)"
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config CRYPTO_CRC32_LOONGARCH
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tristate "CRC32c and CRC32"
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select CRC32
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select CRYPTO_HASH
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help
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CRC32c and CRC32 CRC algorithms
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Architecture: LoongArch with CRC32 instructions
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endmenu
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@ -0,0 +1,6 @@
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# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for LoongArch crypto files..
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#
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obj-$(CONFIG_CRYPTO_CRC32_LOONGARCH) += crc32-loongarch.o
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@ -0,0 +1,304 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* crc32.c - CRC32 and CRC32C using LoongArch crc* instructions
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*
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* Module based on mips/crypto/crc32-mips.c
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*
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* Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org>
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* Copyright (C) 2018 MIPS Tech, LLC
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* Copyright (C) 2020-2023 Loongson Technology Corporation Limited
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*/
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#include <linux/module.h>
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#include <crypto/internal/hash.h>
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#include <asm/cpu-features.h>
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#include <asm/unaligned.h>
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#define _CRC32(crc, value, size, type) \
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do { \
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__asm__ __volatile__( \
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#type ".w." #size ".w" " %0, %1, %0\n\t"\
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: "+r" (crc) \
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: "r" (value) \
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: "memory"); \
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} while (0)
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#define CRC32(crc, value, size) _CRC32(crc, value, size, crc)
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#define CRC32C(crc, value, size) _CRC32(crc, value, size, crcc)
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static u32 crc32_loongarch_hw(u32 crc_, const u8 *p, unsigned int len)
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{
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u32 crc = crc_;
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while (len >= sizeof(u64)) {
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u64 value = get_unaligned_le64(p);
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CRC32(crc, value, d);
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p += sizeof(u64);
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len -= sizeof(u64);
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}
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if (len & sizeof(u32)) {
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u32 value = get_unaligned_le32(p);
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CRC32(crc, value, w);
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p += sizeof(u32);
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len -= sizeof(u32);
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}
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if (len & sizeof(u16)) {
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u16 value = get_unaligned_le16(p);
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CRC32(crc, value, h);
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p += sizeof(u16);
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}
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if (len & sizeof(u8)) {
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u8 value = *p++;
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CRC32(crc, value, b);
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}
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return crc;
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}
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static u32 crc32c_loongarch_hw(u32 crc_, const u8 *p, unsigned int len)
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{
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u32 crc = crc_;
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while (len >= sizeof(u64)) {
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u64 value = get_unaligned_le64(p);
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CRC32C(crc, value, d);
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p += sizeof(u64);
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len -= sizeof(u64);
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}
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if (len & sizeof(u32)) {
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u32 value = get_unaligned_le32(p);
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CRC32C(crc, value, w);
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p += sizeof(u32);
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len -= sizeof(u32);
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}
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if (len & sizeof(u16)) {
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u16 value = get_unaligned_le16(p);
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CRC32C(crc, value, h);
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p += sizeof(u16);
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}
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if (len & sizeof(u8)) {
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u8 value = *p++;
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CRC32C(crc, value, b);
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}
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return crc;
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}
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#define CHKSUM_BLOCK_SIZE 1
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#define CHKSUM_DIGEST_SIZE 4
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struct chksum_ctx {
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u32 key;
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};
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struct chksum_desc_ctx {
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u32 crc;
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};
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static int chksum_init(struct shash_desc *desc)
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{
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struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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ctx->crc = mctx->key;
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return 0;
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}
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/*
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* Setting the seed allows arbitrary accumulators and flexible XOR policy
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* If your algorithm starts with ~0, then XOR with ~0 before you set the seed.
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*/
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static int chksum_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen)
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{
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struct chksum_ctx *mctx = crypto_shash_ctx(tfm);
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if (keylen != sizeof(mctx->key))
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return -EINVAL;
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mctx->key = get_unaligned_le32(key);
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return 0;
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}
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static int chksum_update(struct shash_desc *desc, const u8 *data, unsigned int length)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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ctx->crc = crc32_loongarch_hw(ctx->crc, data, length);
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return 0;
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}
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static int chksumc_update(struct shash_desc *desc, const u8 *data, unsigned int length)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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ctx->crc = crc32c_loongarch_hw(ctx->crc, data, length);
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return 0;
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}
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static int chksum_final(struct shash_desc *desc, u8 *out)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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put_unaligned_le32(ctx->crc, out);
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return 0;
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}
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static int chksumc_final(struct shash_desc *desc, u8 *out)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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put_unaligned_le32(~ctx->crc, out);
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return 0;
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}
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static int __chksum_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
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{
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put_unaligned_le32(crc32_loongarch_hw(crc, data, len), out);
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return 0;
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}
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static int __chksumc_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
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{
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put_unaligned_le32(~crc32c_loongarch_hw(crc, data, len), out);
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return 0;
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}
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static int chksum_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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return __chksum_finup(ctx->crc, data, len, out);
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}
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static int chksumc_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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return __chksumc_finup(ctx->crc, data, len, out);
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}
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static int chksum_digest(struct shash_desc *desc, const u8 *data, unsigned int length, u8 *out)
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{
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struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
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return __chksum_finup(mctx->key, data, length, out);
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}
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static int chksumc_digest(struct shash_desc *desc, const u8 *data, unsigned int length, u8 *out)
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{
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struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
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return __chksumc_finup(mctx->key, data, length, out);
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}
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static int chksum_cra_init(struct crypto_tfm *tfm)
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{
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struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
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mctx->key = 0;
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return 0;
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}
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static int chksumc_cra_init(struct crypto_tfm *tfm)
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{
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struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
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mctx->key = ~0;
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return 0;
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}
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static struct shash_alg crc32_alg = {
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.digestsize = CHKSUM_DIGEST_SIZE,
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.setkey = chksum_setkey,
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.init = chksum_init,
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.update = chksum_update,
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.final = chksum_final,
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.finup = chksum_finup,
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.digest = chksum_digest,
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.descsize = sizeof(struct chksum_desc_ctx),
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.base = {
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.cra_name = "crc32",
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.cra_driver_name = "crc32-loongarch",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
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.cra_blocksize = CHKSUM_BLOCK_SIZE,
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.cra_alignmask = 0,
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.cra_ctxsize = sizeof(struct chksum_ctx),
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.cra_module = THIS_MODULE,
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.cra_init = chksum_cra_init,
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}
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};
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static struct shash_alg crc32c_alg = {
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.digestsize = CHKSUM_DIGEST_SIZE,
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.setkey = chksum_setkey,
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.init = chksum_init,
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.update = chksumc_update,
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.final = chksumc_final,
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.finup = chksumc_finup,
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.digest = chksumc_digest,
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.descsize = sizeof(struct chksum_desc_ctx),
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.base = {
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.cra_name = "crc32c",
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.cra_driver_name = "crc32c-loongarch",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
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.cra_blocksize = CHKSUM_BLOCK_SIZE,
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.cra_alignmask = 0,
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.cra_ctxsize = sizeof(struct chksum_ctx),
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.cra_module = THIS_MODULE,
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.cra_init = chksumc_cra_init,
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}
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};
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static int __init crc32_mod_init(void)
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{
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int err;
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if (!cpu_has(CPU_FEATURE_CRC32))
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return 0;
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err = crypto_register_shash(&crc32_alg);
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if (err)
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return err;
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err = crypto_register_shash(&crc32c_alg);
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if (err)
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return err;
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return 0;
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}
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static void __exit crc32_mod_exit(void)
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{
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if (!cpu_has(CPU_FEATURE_CRC32))
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return;
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crypto_unregister_shash(&crc32_alg);
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crypto_unregister_shash(&crc32c_alg);
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}
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module_init(crc32_mod_init);
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module_exit(crc32_mod_exit);
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MODULE_AUTHOR("Min Zhou <zhoumin@loongson.cn>");
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MODULE_AUTHOR("Huacai Chen <chenhuacai@loongson.cn>");
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MODULE_DESCRIPTION("CRC32 and CRC32C using LoongArch crc* instructions");
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MODULE_LICENSE("GPL v2");
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@ -1395,6 +1395,9 @@ endif
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if ARM64
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source "arch/arm64/crypto/Kconfig"
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endif
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if LOONGARCH
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source "arch/loongarch/crypto/Kconfig"
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endif
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if MIPS
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source "arch/mips/crypto/Kconfig"
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endif
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