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

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Message-ID: <CAE4R7bBm1udW2aRRjrHgA5413XFKOoUNwCk=5ZDtv0RQ70qE7w@mail.gmail.com>
Date:	Wed, 15 Jul 2015 11:46:26 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Anuradha Karuppiah <anuradhak@...ulusnetworks.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	Andy Gospodarek <gospo@...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 11:36 AM, Anuradha Karuppiah
<anuradhak@...ulusnetworks.com> wrote:
> On Wed, Jul 15, 2015 at 11:29 AM, Scott Feldman <sfeldma@...il.com> wrote:
>> On Wed, Jul 15, 2015 at 8:53 AM, Anuradha Karuppiah
>> <anuradhak@...ulusnetworks.com> wrote:
>>> On Tue, Jul 14, 2015 at 10:08 PM, Scott Feldman <sfeldma@...il.com> 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.
>>>>
>>>> Also, is the sysfs interface necessary?  The netlink/iproute2
>>>> interface seems sufficient.
>>>>
>>>> -scott
>>>
>>> Yes, for the current use case (MLAG) it would be better to isolate the
>>> changes to switchdev. Also if we go with the switchdev option are you
>>> thinking about dropping the netdev->proto_down bool attribute
>>> altogether and only keeping that info in the switch drivers that
>>> support the op?
>>
>> Yes.
>>
>>> You are right, the sysfs is not necessary. I can make it RO and just
>>> use it for displaying or drop it all together. What would you
>>> recommend?
>>
>> Drop it if it's not needed/used.
>>
>> On the iproute2 part, do we expect users to manually toggle this flag
>> from the cmdline?  Seems kind of weird to walk up to a box and say "ip
>> link set dev DEV protodown on".  Isn't this more intended for external
>> agents (i.e. MLAG) to toggle?  I guess if there is a netlink attr for
>> the flag, there should be a user-interface.  But it seems like it'll
>> be a source of confusion for 99.999% of the users out there that
>> wonder what this knob does.
>
> The MLAG app currently does use the iproute2 interface for toggling
> protodown. So I may not be able to drop the iproute2 config option
> easily.

It can send netlink msg directly as easy as doing exec "ip link set
...", I assume.

Forgive me if I've asked this before: where is this MLAG app?
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