netdev - Re: [PATCH net] ixgbe: fix probing of multi-port devices with one MDIO

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Date:   Fri, 16 Oct 2020 17:48:07 -0700
From:   Jesse Brandeburg <jesse.brandeburg@...el.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Ian Kumlien <ian.kumlien@...il.com>, anthony.l.nguyen@...el.com,
        David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        kernel-team@...com, Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH net] ixgbe: fix probing of multi-port devices with one
 MDIO

Jakub Kicinski wrote:

> On Sat, 17 Oct 2020 01:50:59 +0200 Ian Kumlien wrote:
> > On Sat, Oct 17, 2020 at 1:20 AM Jakub Kicinski <kuba@...nel.org> wrote:
> > > Ian reports that after upgrade from v5.8.14 to v5.9 only one
> > > of his 4 ixgbe netdevs appear in the system.
> > >
> > > Quoting the comment on ixgbe_x550em_a_has_mii():
> > >  * Returns true if hw points to lowest numbered PCI B:D.F x550_em_a device in
> > >  * the SoC.  There are up to 4 MACs sharing a single MDIO bus on the x550em_a,
> > >  * but we only want to register one MDIO bus.
> > >
> > > This matches the symptoms, since the return value from
> > > ixgbe_mii_bus_init() is no longer ignored we need to handle
> > > the higher ports of x550em without an error.  
> > 
> > Nice, that fixes it!
> > 
> > You can add a:
> > Tested-by: Ian Kumlien <ian.kumlien@...il.com>
> 
> Will do, thanks!
> 
> Tony, should I apply directly to net?

Thank you Kuba!

Seems like a pretty straight forward bug-fix. I recommend
you apply it directly.

Acked-by: Jesse Brandeburg <jesse.brandeburg@...el.com>