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Date:   Thu, 10 Sep 2020 13:30:58 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Oded Gabbay <oded.gabbay@...il.com>
Cc:     "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org, SW_Drivers <SW_Drivers@...ana.ai>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Omer Shpigelman <oshpigelman@...ana.ai>
Subject: Re: [PATCH 12/15] habanalabs/gaudi: add debugfs entries for the NIC

On Thu, 10 Sep 2020 23:17:59 +0300 Oded Gabbay wrote:
> > Doesn't seem like this one shows any more information than can be
> > queried with ethtool, right?  
> correct, it just displays it in a format that is much more readable

You can cat /sys/class/net/$ifc/carrier if you want 0/1.

> > > nic_mac_loopback
> > > is to set a port to loopback mode and out of it. It's not really
> > > configuration but rather a mode change.  
> >
> > What is this loopback for? Testing?  
> 
> Correct.

Loopback test is commonly implemented via ethtool -t

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