Re: [PATCH] arm64: Implement optimised IP checksum helpers

From	Catalin Marinas <catalin.marinas@arm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] arm64: Implement optimised IP checksum helpers
Date	2016-06-17 19:10 +0200
Message-ID	<rL5rj-ST-1@gated-at.bofh.it> (permalink)
References	<rxZMK-7Mu-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, May 12, 2016 at 03:26:48PM +0100, Robin Murphy wrote:
> AArch64 is capable of 128-bit memory accesses without alignment
> restrictions, which makes it both possible and highly practical to slurp
> up a typical 20-byte IP header in just 2 loads. Implement our own
> version of ip_fast_checksum() to take advantage of that, resulting in
> considerably fewer instructions and memory accesses than the generic
> version. We can also get more optimal code generation for csum_fold() by
> defining it a slightly different way round from the generic version, so
> throw that into the mix too.
> 
> Suggested-by: Luke Starrett <luke.starrett@broadcom.com>
> Signed-off-by: Robin Murphy <robin.murphy@arm.com>

Queued for 4.8. Thanks.

-- 
Catalin

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Re: [PATCH] arm64: Implement optimised IP checksum helpers Catalin Marinas <catalin.marinas@arm.com> - 2016-06-17 19:10 +0200

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