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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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