netdev - Re: [PATCH 7/7] venet: add scatter-gather/GSO support

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Date:	Mon, 3 Aug 2009 11:33:55 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Gregory Haskins <ghaskins@...ell.com>
Cc:	linux-kernel@...r.kernel.org,
	alacrityvm-devel@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: Re: [PATCH 7/7] venet: add scatter-gather/GSO support

On Mon, 03 Aug 2009 13:18:07 -0400
Gregory Haskins <ghaskins@...ell.com> wrote:

> +	struct {
> +		int                sg:1;
> +		int                tso:1;
> +		int                ufo:1;
> +		int                tso6:1;
> +		int                ecn:1;
> +	} flags;

Why do you have to shadow flags that are already available in net_device?
It is bad design to replicate state in a device driver. The problem
with replicated state is that it has to be updated in both places.

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