netdev - Re: [PATCH 0/7] via-velocity performance fixes

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Message-ID: <20091123082708.737854f1@nehalam>
Date:	Mon, 23 Nov 2009 08:27:08 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Simon Kagstrom <simon.kagstrom@...insight.net>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, davej@...hat.com,
	romieu@...zoreil.com
Subject: Re: [PATCH 0/7] via-velocity performance fixes

On Mon, 23 Nov 2009 14:39:22 +0100
Simon Kagstrom <simon.kagstrom@...insight.net> wrote:

> while the VIA driver does
> 
> 	ip_summed = CHECKSUM_NONE;
> 	if (hardware sees that this is an IP packet):
> 		if (hw IP checksum is OK):
> 			if (hw sees that this is a TCP/UDP packet):
> 				if (hw TCP/UDP checksum is NOT OK):
> 					return  # Returning CHECKSUM_NONE
> 				ip_summed = CHECKSUM_UNNECESSARY
> 
> i.e., it will return CHECKSUM_NONE also for non-TCP/UDP IP packets.

That is correct assuming hardware can only checksum TCP/UDP.

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