netdev - Re: [RFC] IPV6 checksum offloading in network devices

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Message-Id: <20070627.004453.55726417.davem@davemloft.net>
Date:	Wed, 27 Jun 2007 00:44:53 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...ux-foundation.org
Cc:	kaber@...sh.net, herbert.xu@...hat.com, netdev@...r.kernel.org,
	mchan@...adcom.com
Subject: Re: [RFC] IPV6 checksum offloading in network devices

From: Stephen Hemminger <shemminger@...ux-foundation.org>
Date: Wed, 30 May 2007 14:00:34 -0700

> This is better. 
> There is still a possiblity when a device allows IPV6 and not IPV4
> checksumming, that the checksum will be done in the fixup code in
> dev_queue_xmit.
> 
> The existing model for checksum offload does not correctly handle
> devices that can offload IPV4 and IPV6 only. The NETIF_F_HW_CSUM flag
> implies device can do any arbitrary protocol.
> 
> This patch:
>  * adds NETIF_F_IPV6_CSUM for those devices
>  * fixes bnx2 and tg3 devices that need it
>  * add NETIF_F_IPV6_CSUM to ipv6 output (incl GSO)
>  * fixes assumptions about NETIF_F_ALL_CSUM in nat
>  * adjusts bridge union of checksumming computation

I've applied this to net-2.6.23, we can back it out or rework
it if there are problems.

Several of these checksum feature tests are getting out of
hand :-)
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