netdev - Re: [RFC/PATCH] SO_NO

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Message-ID: <4744CAA4.50102@garzik.org>
Date:	Wed, 21 Nov 2007 19:17:40 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC/PATCH] SO_NO_CHECK for IPv6

YOSHIFUJI Hideaki / 吉藤英明 wrote:
> In article <20071121124532.GA17263@...oc.gtf.org> (at Wed, 21 Nov 2007 07:45:32 -0500), Jeff Garzik <jeff@...zik.org> says:
> 
>> SO_NO_CHECK support for IPv6 appeared to be missing. This is presented,
>> based on a reading of net/ipv4/udp.c.
> 
> Disagree. UDP checksum is mandatory in IPv6.

Ah, you mean that I need to turn off UDP checksum on receive end as well 
in IPv6...  true.

For those interested, I am dealing with a UDP app that already does very 
strong checksumming and encryption, so additional software checksumming 
at the lower layers is quite simply a waste of CPU cycles.  Hardware 
checksumming is fine, as long as its "free."

	Jeff



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