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Commit 6dd7a82c authored by Anton Blanchard's avatar Anton Blanchard Committed by Herbert Xu
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crypto: powerpc - Add POWER8 optimised crc32c 



Use the vector polynomial multiply-sum instructions in POWER8 to
speed up crc32c.

This is just over 41x faster than the slice-by-8 method that it
replaces. Measurements on a 4.1 GHz POWER8 show it sustaining
52 GiB/sec.

A simple btrfs write performance test:

    dd if=/dev/zero of=/mnt/tmpfile bs=1M count=4096
    sync

is over 3.7x faster.

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 151f2511

arch/powerpc/crypto/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -9,9 +9,11 @@ obj-$(CONFIG_CRYPTO_MD5_PPC) += md5-ppc.o 
obj-$(CONFIG_CRYPTO_SHA1_PPC) += sha1-powerpc.o

obj-$(CONFIG_CRYPTO_SHA1_PPC_SPE) += sha1-ppc-spe.o

obj-$(CONFIG_CRYPTO_SHA256_PPC_SPE) += sha256-ppc-spe.o

obj-$(CONFIG_CRYPT_CRC32C_VPMSUM) += crc32c-vpmsum.o



aes-ppc-spe-y := aes-spe-core.o aes-spe-keys.o aes-tab-4k.o aes-spe-modes.o aes-spe-glue.o

md5-ppc-y := md5-asm.o md5-glue.o

sha1-powerpc-y := sha1-powerpc-asm.o sha1.o

sha1-ppc-spe-y := sha1-spe-asm.o sha1-spe-glue.o

sha256-ppc-spe-y := sha256-spe-asm.o sha256-spe-glue.o

crc32c-vpmsum-y := crc32c-vpmsum_asm.o crc32c-vpmsum_glue.o