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

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Message-ID: <CAE4R7bB0ZqjA+2C7EL7fe0o1fvzoNofMmZsbD6FK4_ZYKXdrhg@mail.gmail.com>
Date:	Wed, 25 Feb 2015 16:53:24 -0800
From:	Scott Feldman <sfeldma@...il.com>
To:	Andy Gospodarek <gospo@...ulusnetworks.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 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.

-scott
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