netdev - Re: [PATCH net-next v7 0/4] net: Introduce protodown flag.

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Message-ID: <CAE4R7bCfu6a5H-niv2h47WTYEUcH9KYys4tpLzSTNpUAnq9Hcw@mail.gmail.com>
Date:	Wed, 15 Jul 2015 10:34:04 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Andy Gospodarek <gospo@...ulusnetworks.com>
Cc:	Anuradha Karuppiah <anuradhak@...ulusnetworks.com>,
	"David S. Miller" <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	Wilson Kok <wkok@...ulusnetworks.com>
Subject: Re: [PATCH net-next v7 0/4] net: Introduce protodown flag.

On Wed, Jul 15, 2015 at 9:24 AM, Andy Gospodarek
<gospo@...ulusnetworks.com> wrote:
> On Tue, Jul 14, 2015 at 10:08:35PM -0700, Scott Feldman wrote:
>> On Tue, Jul 14, 2015 at 1:43 PM,  <anuradhak@...ulusnetworks.com> wrote:
>> > From: Anuradha Karuppiah <anuradhak@...ulusnetworks.com>
>> >
>> > User space daemons can detect errors in the network that need to be
>> > notified to the switch device drivers.
>> >
>> > Drivers can react to this error state by doing a phy-down on the
>> > switch-port which would result in a carrier-off locally and on the directly
>> > connected switch. Doing that would prevent loops and black-holes in the
>> > network.
>>
>> Hi Anuradha,
>>
>> Since this is a switch-thingy, can you move this to switchdev port
>> attribute rather than adding another ndo op?  I know you started this
>> patch set before switchdev port attrs, but I think it's worthwhile
>> moving it to switchdev since clearly the use-case is switch device
>> drivers.   Let me know if you need help converting over to switchdev
>> port attr.
>
> If it is switchdev-only that would prevent people from using commodity
> hardware (classic servers + NICs) from being able to build something
> similar to what can be done with rocker.

That's not true.  There is nothing preventing a classic NIC driver
from implementing some/all switchdev ops if the device can do
forwarding offload or other switchy-things.

This patchset is about a switch feature (MLAG was the example
use-case), so let's move this under switchdev.
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