netdev - Re: ixgbe / mdio dependancy error

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Date:   Wed, 02 Jan 2019 15:38:23 -0800
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     Steve Douthit <stephend@...icom-usa.com>,
        Dave Jones <davej@...emonkey.org.uk>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Bowers <andrewx.bowers@...el.com>
Subject: Re: ixgbe / mdio dependancy error

On Wed, 2019-01-02 at 23:30 +0000, Steve Douthit wrote:
> > This is because PHYLIB=m which forces MDIO_BUS=m.  If you have
> > IXGBE=y,
> > then PHYLIB and MDIO_BUS can't be modules.  Working on a patch to
> > correct the issue.
> 
> There was a review comment to select MDIO_DEVICE instead of PHYLIB.
> PHYLIB seems correct to me now that I'm looking at this again
> though.  I
> came up empty looking for any other drivers that select MDIO_DEVICE.
> 
> The objection was that DSA devices wouldn't need the PHYLIB API, so
> why
> force it to be built-in.  NET_DSA selects PHYLINK which selects
> PHYLIB.
> I think we're ok going back to select PHYLIB if that was the only
> problem.

Unfortunately, we get into a recursive dependency issue when IPSec gets
involved, and IPSec is enabled by default.

I am looking at making MDIO_BUS support for ixgbe an option like IPSec,
DCB, DCA and HWMON.  Where a user can select the option to have
MDIO_BUS support for DSA devices, that way we can add the requirement
that it requires !(IXGBE=y && MDIO_BUS=m).

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