netdev - Re: [PATCH net] net: dsa: felix: send VLANs on CPU port as egress-tagged

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Message-Id: <20200527.114128.968056476015528435.davem@davemloft.net>
Date:   Wed, 27 May 2020 11:41:28 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     olteanv@...il.com
Cc:     andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH net] net: dsa: felix: send VLANs on CPU port as
 egress-tagged

From: Vladimir Oltean <olteanv@...il.com>
Date: Wed, 27 May 2020 19:48:03 +0300

> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> As explained in other commits before (b9cd75e66895 and 87b0f983f66f),
> ocelot switches have a single egress-untagged VLAN per port, and the
> driver would deny adding a second one while an egress-untagged VLAN
> already exists.
> 
> But on the CPU port (where the VLAN configuration is implicit, because
> there is no net device for the bridge to control), the DSA core attempts
> to add a VLAN using the same flags as were used for the front-panel
> port. This would make adding any untagged VLAN fail due to the CPU port
> rejecting the configuration:
> 
> bridge vlan add dev swp0 vid 100 pvid untagged
> [ 1865.854253] mscc_felix 0000:00:00.5: Port already has a native VLAN: 1
> [ 1865.860824] mscc_felix 0000:00:00.5: Failed to add VLAN 100 to port 5: -16
> 
> (note that port 5 is the CPU port and not the front-panel swp0).
> 
> So this hardware will send all VLANs as tagged towards the CPU.
> 
> Fixes: 56051948773e ("net: dsa: ocelot: add driver for Felix switch family")
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Applied and queued up for -stable, thanks.