netdev - Re: [ethtool PATCH] ethtool: Support n-tuple filter programming

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Message-Id: <1277207145.2091.3.camel@achroite.uk.solarflarecom.com>
Date:	Tue, 22 Jun 2010 12:45:45 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Cc:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"jeff@...zik.org" <jeff@...zik.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>
Subject: Re: [ethtool PATCH] ethtool: Support n-tuple filter programming

On Mon, 2010-06-21 at 13:31 -0700, Peter P Waskiewicz Jr wrote:
> On Mon, 21 Jun 2010, Ben Hutchings wrote:
> 
> > On Wed, 2010-02-03 at 23:51 -0800, Jeff Kirsher wrote:
> >> From: Peter Waskiewicz <peter.p.waskiewicz.jr@...el.com>
> >>
> >> Program underlying ethernet devices with n-tuple flow classification
> >> filters.
> >>
> >> This also adds a new flag to ethtool_flags, allowing n-tuple
> >> programming to be toggled using the set_flags call.
> >
> > I just noticed a problem with the implementation which makes me wonder
> > whether this was tested at all:
> 
> Yes, it was tested.  We didn't hit every corner case, which I think your 
> catch below is a corner case issue.  Our hardware can only do so much.

It's not a corner case.  You have added options that cannot work
correctly.

[...]
> When this was proposed, we added the IPv4 address as a single int.  People 
> seemed ok with it at the time, so we went with it.  If you have a 
> different approach, please present it.

And you don't think it matters that the address has to be written
differently on big- and little-endian architectures?

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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