netdev - dsa: mv88e6xxx losing DHCPv6 solicit packets / IPv6 multicast packets?

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Message-ID: <20200723164610.62e70bde@dellmb.labs.office.nic.cz>
Date:   Thu, 23 Jul 2020 16:46:10 +0200
From:   Marek Behún <marek.behun@....cz>
To:     netdev@...r.kernel.org
Cc:     andrew@...n.ch, vivien.didelot@...il.com,
        Chris Packham <chris.packham@...iedtelesis.co.nz>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: dsa: mv88e6xxx losing DHCPv6 solicit packets / IPv6 multicast
 packets?

Hi,

a customer of ours filed a ticket saying that when using upstream kernel
(5.8.0-rc6 on Debian 10) on Turris MOX (88e6190 switch) with DSA with
default configuration, the switch is losing DHCPv6 solicit packets /
IPv6 multicast packets sent to ff02::1::2 address.

> Specifically, it seems the 88E6190 hardware switches in the Peridot
> module is swallowing IPv6 multicast packets (sent to ff02::1:2 ).

> We tested this by mirroring the Mox LAN port on the switch and saw the
> DHCPv6 solicit packet arriving out of the switch but the Mox kernel
> didn't see it (using tcpdump).

Is this issue known?

Marek