netdev - Re: [PATCH] net: phy: b53: switchdev driver for Broadcom BCM53xx switches

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Date:	Wed, 25 Feb 2015 23:21:58 -0500
From:	Andy Gospodarek <gospo@...ulusnetworks.com>
To:	Scott Feldman <sfeldma@...il.com>
Cc:	Andrew Lunn <andrew@...n.ch>, Rafa?? Mi??ecki <zajec5@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Network Development <netdev@...r.kernel.org>,
	Jonas Gorski <jogo@...nwrt.org>,
	Hauke Mehrtens <hauke@...ke-m.de>,
	Felix Fietkau <nbd@...nwrt.org>, Jiri Pirko <jiri@...nulli.us>
Subject: Re: [PATCH] net: phy: b53: switchdev driver for Broadcom BCM53xx
 switches

On Wed, Feb 25, 2015 at 04:53:24PM -0800, Scott Feldman wrote:
> On Wed, Feb 25, 2015 at 7:46 AM, Andy Gospodarek
> <gospo@...ulusnetworks.com> wrote:
> > On Wed, Feb 25, 2015 at 03:03:56PM +0100, Andrew Lunn wrote:
> > [...]
> >>
> >> What we don't want is X chip families and Y different ways to
> >> configure the features. Ideal we want X chip families, and one way to
> >> configure them all.
> >
> > This statement is really my primary concern.  There is lots of interest
> > around hardware offload at this point and it seems like there is a risk
> > that a lack of consistency can create problems.
> >
> > I think these patches are great as they allow for the programming of the
> > offload hardware (and it has been pointed out that this drastically
> > increases performance), but one concern I have with this patch (related
> > to this) is that I'm not sure there is a major need to create netdevs
> > automatically if there is not the ability to rx/tx actual frames on
> > these interfaces.
> 
> Even when not used for rx/tx to CPU, it seems the netdevs are still
> useful as an anchor to build higher-level constructs such as bridge or
> bond, and to hang stuff like netdev stats or ethtool-ish things.
> 

I agree that they are useful, but now we are really dealing with a
netdev that is slightly lower functionality than we expect from a netdev
right now.

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