netdev - RE: [PATCH v5 net-next] net: Implement fast csum_partial for x86

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Date:	Tue, 8 Mar 2016 11:03:11 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Alexander Duyck' <alexander.duyck@...il.com>,
	Tom Herbert <tom@...bertland.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
	"kernel-team@...com" <kernel-team@...com>
Subject: RE: [PATCH v5 net-next] net: Implement fast csum_partial for x86_64

From: Alexander Duyck 
...
> One thought I had is that we may want to look into making an inline
> function that we can call for compile-time defined lengths less than
> 64.  Maybe call it something like __csum_partial and we could then use
> that in place of csum_partial for all those headers that are a fixed
> length that we pull such as UDP, VXLAN, Ethernet, and the rest.  Then
> we might be able to look at taking care of alignment for csum_partial
> which will improve the skb_checksum() case without impacting the
> header pulling cases as much since that code would be inlined
> elsewhere.

I think there are some patches going through the ppc tree to do
exactly that.

	David