netdev - Re: [RFC PATCH v2 linux-next 13/14] net: dsa: sja1105: expose the SGMII PCS as an mdio

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Message-ID: <20210526154102.dlp2clwqncadna2v@skbuf>
Date:   Wed, 26 May 2021 18:41:02 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [RFC PATCH v2 linux-next 13/14] net: dsa: sja1105: expose the
 SGMII PCS as an mdio_device

On Wed, May 26, 2021 at 04:29:11PM +0100, Russell King (Oracle) wrote:
> On Wed, May 26, 2021 at 04:55:34PM +0300, Vladimir Oltean wrote:
> > Since we touch all PCS accessors again, now it is a good time to check
> > for error codes from the hardware access as well. We can't propagate the
> > errors very far due to phylink returning void for mac_config and
> > mac_link_up, but at least we print them to the console.
> 
> phylink doesn't have much option on what it could do if we error out at
> those points - I suppose we could print a non-specific error and then
> lock-out the interface in a similar way that phylib does, but to me that
> seems really unfriendly if you're remotely accessing a box and the error
> is intermittent.

I would like to have intermittent errors at this level logged, because
to me they would be quite unexpected and I would like to have some rope
to pull while debugging - an error code, something.

If there's an error of any sort, the interface won't be fully
initialized anyway, so not functional.

The reason why I added error checking in this patch is because I was
working on the MDIO bus accessors and I wanted to make sure that the
errors returned there are propagated somewhere.