netdev - Re: net: phylink: dsa: mv88e6xxx: flaky link detection on switch ports with internal PHYs

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Date:   Tue, 22 Jan 2019 16:04:16 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     John David Anglin <dave.anglin@...l.net>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Russell King <linux@....linux.org.uk>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        netdev@...r.kernel.org
Subject: Re: net: phylink: dsa: mv88e6xxx: flaky link detection on switch
 ports with internal PHYs

On 1/22/19 4:00 PM, John David Anglin wrote:
> On 2019-01-22 6:12 p.m., Andrew Lunn wrote:
>> I just booted my espressobin with net-next. It is running Debian, and
>> i have the following in /etc/network/interfaces
>>
>> source /etc/network/interfaces.d/*
>>
>> # The loopback network interface
>> auto lo
>> iface lo inet loopback
>>
>> # The primary network interface
>> allow-hotplug wan
>> iface wan inet dhcp
>>   pre-up ip link set eth0 up
>>
>> allow-hotplug lan0
>> iface lan0 inet static
>>   pre-up ip link set eth0 up
>>   address 10.42.42.42
>>   netmask 255.255.255.0
>>
>> my wan port got its IP address from DHCP.
> Your configuration is different.  I have the wan, lan0 and lan1 ports
> configured as a bridge and they
> don't get IP addresses.  The only port that gets an IP is br0.

If you bridge all devices together that's expected. If you leave the
network devices interfaces outside of the bridge, then they act as
individual/standalone network ports, and that is where a DHCP client
would be running.

The point Andrew as trying to make is that if you make sure you always
bring-up the DSA master network device, typically ethX first, and then
the DSA network interfaces that are per-port, then you should not have
any issues with link being UP/DOWN. Whether IP stack works is a
different thing.
-- 
Florian