netdev - Re: [PATCH] gianfar: Add gfar_change

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Date:   Thu, 6 Dec 2018 17:21:31 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Joakim Tjernlund <Joakim.Tjernlund@...inera.com>
Cc:     "claudiu.manoil@....com" <claudiu.manoil@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] gianfar: Add gfar_change_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. 

Hi Jockim

What type of switch is it?

What i would expect is you use a switch driver, and that driver would
allow access to the switches PHYs. When the external port goes down,
the Linux interface for that port would go down. There is no need to
change the carrier on the master interface.

       Andrew