netdev - Re: [PATCH net] net: mvpp2: Enable autoneg bypass for 1000BaseX/2500BaseX ports

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Message-ID: <20200528201522.GD849697@lunn.ch>
Date:   Thu, 28 May 2020 22:15:22 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Thomas Bogendoerfer <tbogendoerfer@...e.de>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: mvpp2: Enable autoneg bypass for
 1000BaseX/2500BaseX ports

On Thu, May 28, 2020 at 08:43:12PM +0200, Thomas Bogendoerfer wrote:
> On Thu, 28 May 2020 15:48:05 +0100
> Russell King - ARM Linux admin <linux@...linux.org.uk> wrote:
> 
> > On Thu, May 28, 2020 at 04:33:35PM +0200, Thomas Bogendoerfer wrote:
> > > below is the dts part for the two network interfaces. The switch to
> > > the outside has two ports, which correlate to the two internal ports.
> > > And the switch propagates the link state of the external ports to
> > > the internal ports.
> > 
> > Okay, so this DTS hasn't been reviewed...
> 
> that's from our partner, I'm just using it. Stripping it down isn't
> the point for my now.
> 
> > This isn't correct - you are requesting that in-band status is used
> > (i.o.w. the in-band control word, see commit 4cba5c210365), but your
> > bug report wants to enable AN bypass because there is no in-band
> > control word.  This seems to be rather contradictory.
> > 
> > May I suggest you use a fixed-link here, which will not have any
> 
> afaik fixed-link will always be up, and we want to have the link state
> from the switch external ports.
> 
> > inband status, as there is no in-band control word being sent by
> > the switch?  That is also the conventional way of handling switch
> > links.
> 
> again, we want to propagte the external link state inside to all
> the internal nodes. So this will not work anymore with fixed-link.

Just for my understanding...

https://www.ambedded.com/ARM_Server_platform.html

seems to suggest there are 4 external ports. You want to pass the link
status of these four external ports to the CPU module?

	Andrew