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Date: Fri, 17 Jun 2016 18:00:13 +0100 From: Catalin Marinas <catalin.marinas@....com> To: Robin Murphy <robin.murphy@....com> Cc: will.deacon@....com, luke.starrett@...adcom.com, bcm-kernel-feedback-list@...adcom.com, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org Subject: Re: [PATCH] arm64: Implement optimised IP checksum helpers 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@...adcom.com> > Signed-off-by: Robin Murphy <robin.murphy@....com> Queued for 4.8. Thanks. -- Catalin
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