Message-ID: <4744CAA4.50102@garzik.org>
Date: Wed, 21 Nov 2007 19:17:40 -0500
From: Jeff Garzik <jeff@garzik.org>
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	<yoshfuji@linux-ipv6.org>
CC: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
       Herbert Xu <herbert@gondor.apana.org.au>,
       David Miller <davem@davemloft.net>
Subject: Re: [RFC/PATCH] SO_NO_CHECK for IPv6
References: <20071121124532.GA17263@havoc.gtf.org> <20071121.222051.94402865.yoshfuji@linux-ipv6.org>
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YOSHIFUJI Hideaki / 吉藤英明 wrote:
> In article <20071121124532.GA17263@havoc.gtf.org> (at Wed, 21 Nov 2007 07:45:32 -0500), Jeff Garzik <jeff@garzik.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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