netdev - Re: [PATCH net-next] net: phy: add GBit master / slave error detection

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Date:   Thu, 19 Jul 2018 16:46:37 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] net: phy: add GBit master / slave error
 detection

> > AFAIR there was a patch a while ago from Mellanox guys that was possibly
> > extending the link notification with an error cause, this sounds like
> > something that could be useful to report to user space somehow to help
> > troubleshoot link down events.
> > 
> Do you by chance have a reference to this patch? There's heavy development
> on the Mellanox drivers with a lot of patches.

Hi Heiner, Florian

A general mechanism has been added to allow error messages to be
reported via netlink sockets. I think wifi was the first to actually
make use of it, since i think Johannes Berg did the core work, but
other parts of the stack have also started using it.

Just picking a commit at random, maybe not the best of examples:

Fixes: 768075ebc238 ("nl80211: add a few extended error strings to key parsing")

       Andrew