netdev - Re: [RFC PATCH net-next v3 0/4] net: Introduce IFF_PROTO

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Message-ID: <CAE4R7bAGRKGShQuSqjvQDW8cG6MHE8Jie7Hp=7FJw00kJM4NgQ@mail.gmail.com>
Date:	Mon, 27 Apr 2015 22:45:46 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	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: [RFC PATCH net-next v3 0/4] net: Introduce IFF_PROTO_DOWN flag.

On Mon, Apr 27, 2015 at 10:38 AM,  <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.

(Sorry if this was asked earlier)

Can the application simply send a SETLINK with IFF_UP clear and the
port driver's ndo_stop would bring the PHY link down?
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