netdev - Re: dsa: mv88e6xxx not receiving IPv6 multicast packets

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Message-ID: <20201114184357.41902445@nic.cz>
Date:   Sat, 14 Nov 2020 18:43:57 +0100
From:   Marek Behun <marek.behun@....cz>
To:     "Tj (Elloe Linux)" <ml.linux@...oe.vision>
Cc:     Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org,
        chris.packham@...iedtelesis.co.nz, f.fainelli@...il.com,
        vivien.didelot@...il.com, info <info@...ris.cz>
Subject: Re: dsa: mv88e6xxx not receiving IPv6 multicast packets

On Sat, 14 Nov 2020 16:06:33 +0000
"Tj (Elloe Linux)" <ml.linux@...oe.vision> wrote:

> On 14/11/2020 15:56, Andrew Lunn wrote:
> >> 1) with isc-dhcp-server configured with very short lease times (180
> >> seconds). After mox reboot (or systemctl restart systemd-networkd)
> >> clients successfully obtain a lease and a couple of RENEWs (requested
> >> after 90 seconds) but then all goes silent, Mox OS no longer sees the
> >> IPv6 multicast RENEW packets and client leases expire.  
> > 
> > So it takes about 3 minutes to reproduce this?
> > 
> > Can you do a git bisect to figure out which change broke it? It will
> > take you maybe 5 minutes per step, and given the wide range of
> > kernels, i'm guessing you need around 15 steps. So maybe two hours of
> > work.
> > 
> > 	Andrew
> >  
> 
> I'll check if we can - the problem might be the Turris Mox kernel is
> based on a board support package drop by Marvell so I'm not clear right
> now how divergent they are. Hopefully the Turris kernel devs can help on
> that.
> 
No, TurrisOS kernel is just current OpenWRT 4.14 kernel with some
patches added onto it. Turris MOX is also supported in upstream kernel.
If this error can be reproduced on upstream kernel, you can try bisect
there...

Marek