netdev - Re: [net PATCH 0/2] Don't use lco_csum to compute IPv4 checksum

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Date:   Wed, 30 Nov 2016 09:47:46 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     alexander.h.duyck@...el.com
Cc:     netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
        sfr@...b.auug.org.au, jeffrey.t.kirsher@...el.com
Subject: Re: [net PATCH 0/2] Don't use lco_csum to compute IPv4 checksum

From: Alexander Duyck <alexander.h.duyck@...el.com>
Date: Mon, 28 Nov 2016 10:42:18 -0500

> When I implemented the GSO partial support in the Intel drivers I was using
> lco_csum to compute the checksum that we needed to plug into the IPv4
> checksum field in order to cancel out the data that was not a part of the
> IPv4 header.  However this didn't take into account that the transport
> offset might be pointing to the inner transport header.
> 
> Instead of using lco_csum I have just coded around it so that we can use
> the outer IP header plus the IP header length to determine where we need to
> start our checksum and then just call csum_partial ourselves.
> 
> This should fix the SIT issue reported on igb interfaces as well as simliar
> issues that would pop up on other Intel NICs.

Jeff, are you going to send me a pull request with this stuff or would
you be OK with my applying these directly to 'net'?

Thanks.