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authorRobin Murphy <robin.murphy@arm.com>2020-01-15 19:42:39 +0300
committerWill Deacon <will@kernel.org>2020-01-16 18:23:29 +0300
commit5777eaed566a1d63e344d3dd8f2b5e33be20643e (patch)
tree9bf4f13c0209f26135e66073760b297ba0cac0d9 /arch/arm64/lib/Makefile
parent46cf053efec6a3a5f343fead837777efe8252a46 (diff)
downloadlinux-5777eaed566a1d63e344d3dd8f2b5e33be20643e.tar.xz
arm64: Implement optimised checksum routine
Apparently there exist certain workloads which rely heavily on software checksumming, for which the generic do_csum() implementation becomes a significant bottleneck. Therefore let's give arm64 its own optimised version - for ease of maintenance this foregoes assembly or intrisics, and is thus not actually arm64-specific, but does rely heavily on C idioms that translate well to the A64 ISA and the typical load/store capabilities of most ARMv8 CPU cores. The resulting increase in checksum throughput scales nicely with buffer size, tending towards 4x for a small in-order core (Cortex-A53), and up to 6x or more for an aggressive big core (Ampere eMAG). Reported-by: Lingyan Huang <huanglingyan2@huawei.com> Tested-by: Lingyan Huang <huanglingyan2@huawei.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/lib/Makefile')
-rw-r--r--arch/arm64/lib/Makefile6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile
index c21b936dc01d..2fc253466dbf 100644
--- a/arch/arm64/lib/Makefile
+++ b/arch/arm64/lib/Makefile
@@ -1,9 +1,9 @@
# SPDX-License-Identifier: GPL-2.0
lib-y := clear_user.o delay.o copy_from_user.o \
copy_to_user.o copy_in_user.o copy_page.o \
- clear_page.o memchr.o memcpy.o memmove.o memset.o \
- memcmp.o strcmp.o strncmp.o strlen.o strnlen.o \
- strchr.o strrchr.o tishift.o
+ clear_page.o csum.o memchr.o memcpy.o memmove.o \
+ memset.o memcmp.o strcmp.o strncmp.o strlen.o \
+ strnlen.o strchr.o strrchr.o tishift.o
ifeq ($(CONFIG_KERNEL_MODE_NEON), y)
obj-$(CONFIG_XOR_BLOCKS) += xor-neon.o