netdev - Re: [RFC] r8169 : why SG / TX checksum are default disabled

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Date:	Mon, 23 Jul 2012 23:59:31 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hayeswang@...ltek.com
Cc:	romieu@...zoreil.com, eric.dumazet@...il.com,
	netdev@...r.kernel.org
Subject: Re: [RFC] r8169 : why SG / TX checksum are default disabled

From: hayeswang <hayeswang@...ltek.com>
Date: Tue, 24 Jul 2012 14:34:04 +0800

>   Francois Romieu [mailto:romieu@...zoreil.com] 
>> Sent: Saturday, July 21, 2012 5:01 AM
>> To: Hayeswang
>> Cc: 'David Miller'; eric.dumazet@...il.com; netdev@...r.kernel.org
>> Subject: Re: [RFC] r8169 : why SG / TX checksum are default disabled
>> 
> [...]
>> 
>> Btw, would there be any point in setting the TcpHeaderOffset field for
>> the post-8168c chipsets ?
> 
> It is used to tell the haredware where the TCP header starts from. I think it is
> reserved for ipv6.

I still have not seen a good explanation why the chip modifies fields
in the packet, such as the length, when we ask it only to compute the
checksum?
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