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

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Date:	Thu, 26 Feb 2015 09:51:10 -0800
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Jiri Pirko <jiri@...nulli.us>,
	Andy Gospodarek <gospo@...ulusnetworks.com>
CC:	Scott Feldman <sfeldma@...il.com>, Andrew Lunn <andrew@...n.ch>,
	Rafa?? Mi??ecki <zajec5@...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>
Subject: Re: [PATCH] net: phy: b53: switchdev driver for Broadcom BCM53xx
 switches

On 25/02/15 22:47, Jiri Pirko wrote:
> Thu, Feb 26, 2015 at 05:21:58AM CET, gospo@...ulusnetworks.com wrote:
>> 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.
> 
> Is that a real care for some device now?
> I agree with Scott that we need to model is consistently. If there is
> such port netdev witch cannot tx/rx, we can expose the fact using some
> flag...

At some point we discussed the possibility of not assigning an
inet_device/inet6_device pointer to a net_device which would be a pure
L2 net_device with only ethtool/bridge offloads, last I tried it blew up
in many places, but we can try again if this is deemed useful?
-- 
Florian
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