netdev - Re: [net-next-2.6 PATCH v2 1/3] ethtool: Introduce n-tuple filter programming support

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Message-ID: <1265323938.2780.6.camel@localhost>
Date:	Thu, 04 Feb 2010 14:52:18 -0800
From:	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	David Miller <davem@...emloft.net>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>
Subject: Re: [net-next-2.6 PATCH v2 1/3] ethtool: Introduce n-tuple filter
 programming support

On Thu, 2010-02-04 at 14:34 -0800, Jeff Garzik wrote:
> On 02/04/2010 04:26 PM, Waskiewicz Jr, Peter P wrote:
> > On Thu, 4 Feb 2010, David Miller wrote:
> >
> >> From: Jeff Kirsher<jeffrey.t.kirsher@...el.com>
> >> Date: Wed, 03 Feb 2010 23:48:13 -0800
> >>
> >>> +#define ETHTOOL_RXNTUPLE_ACTION_DROP -1
> >>> +	struct list_head list;
> >>> +};
> >>
> >> You can't do this.
> >>
> >> You put the list_head here in the kernel header, which BTW can
> >> be used by userspace too, and then you elide it in the
> >> ethtool utility copy of the header.
> >>
> >> Use an encapsulator if you must inside of the kernel, but keep the
> >> userspace visible data structure clean of RCU and list_head
> >> kernel datastructures.
> >
> > Ok.  I'll respin this asap.  Thanks for the quick review Dave.
> 
> Great.  I'll look for the updated userspace patch, too, and put it into 
> the ethtool-2.6.34 pile (ie. ethtool-net-next).
> 

I didn't plan on respinning the userspace side.  I put a container
wrapped around the flow_spec struct to do the list management in the
kernel.  This shouldn't need a change to userspace.

Cheers,
-PJ

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