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

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Date:	Mon, 03 Aug 2009 15:57:59 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Stephen Hemminger <shemminger@...tta.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

Stephen Hemminger wrote:
> 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.
> 

Ya, you are right.  I think the rationale was that the flags were "hw"
state, whereas dev->features was software state.  But thinking about it
after you comments, I don't think it makes much difference either way.

I will just have the negcap() function set the features directly in v2.

Kind Regards,
-Greg


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