netdev - Re: [PATCH] gianfar: Add gfar_change

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Message-ID: <a14732322dfdaa36c4739fc42ef94c3477fe0d72.camel@infinera.com>
Date:   Thu, 6 Dec 2018 16:02:03 +0000
From:   Joakim Tjernlund <Joakim.Tjernlund@...inera.com>
To:     "andrew@...n.ch" <andrew@...n.ch>
CC:     "claudiu.manoil@....com" <claudiu.manoil@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] gianfar: Add gfar_change_carrier()

On Thu, 2018-12-06 at 16:47 +0100, Andrew Lunn wrote:
> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
> 
> 
> On Thu, Dec 06, 2018 at 04:31:25PM +0100, Joakim Tjernlund wrote:
> > This allows to control carrier from /sys/class/net/ethX/carrier
> 
> Hi Joakim
> 
> Please could you explain the use case for this.

I have an eth I/F connected to an internal (on board) switch which has an external port to a mgmt network.
Whenever the external link is broken I want inform linux IP stack that the link is down on the internal eth
I/F as well. The two interfaces are isolated from the rest of the switch ports using VLANs. 

 Jocke