netdev - Re: bug: net: dsa: mv88e6xxx: unable to tx or rx with Clearfog GT 8K (with git bisect)

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Message-ID: <CAOAjy5T0oNJBsjru9r7MPu_oO8TSpY4PKDg7whq4yBJE12mPaA@mail.gmail.com>
Date:   Fri, 17 Jul 2020 05:56:22 +0000
From:   Martin Rowe <martin.p.rowe@...il.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org,
        davem@...emloft.net, vivien.didelot@...il.com
Subject: Re: bug: net: dsa: mv88e6xxx: unable to tx or rx with Clearfog GT 8K
 (with git bisect)

On Sun, 12 Jul 2020 at 13:26, Russell King - ARM Linux admin
<linux@...linux.org.uk> wrote:
> If you have machine A with address 192.168.2.1/24 on lan1 and machine B
> with address 192.168.2.2/24 on lan2, then they should be able to ping
> each other - the packet flow will be through the DSA switch without
> involving the CPU.

I can confirm that bridging the lan ports and connecting two physical
machines does allow me to ping between the two machines, with and
without the commit reverted.

> If it is a port issue, that should help pinpoint it - if it's a problem
> with the CPU port configuration, then ethtool can't read those registers
> (and the only way to get them is to apply some debugfs patch that was
> refused from being merged into mainline.)

It looks like this is the next step then. Do you have a link to the
patch? I'll give it a go. What outputs would be useful for me to
provide?

> > I'm now less confident about my git bisect...
> That seems really weird!

And ended up being unrelated to the current issue; I had other things
connected to the switch while I was testing it and I think STP was
getting involved. Either way, I've isolated it now and have confirmed
that 5.8-rc4 with that one commit reverted is working perfectly. Sorry
for the confusion.

Martin