netdev - Re: [PATCH net 1/2] net: dsa: tag_8021q: Change order of rx

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Date:   Tue, 28 May 2019 16:10:08 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>, vivien.didelot@...il.com,
        andrew@...n.ch, davem@...emloft.net
Cc:     ioana.ciornei@....com, netdev@...r.kernel.org
Subject: Re: [PATCH net 1/2] net: dsa: tag_8021q: Change order of rx_vid setup

On 5/28/19 3:50 PM, Vladimir Oltean wrote:
> From: Ioana Ciornei <ioana.ciornei@....com>
> 
> The 802.1Q tagging performs an unbalanced setup in terms of RX VIDs on
> the CPU port. For the ingress path of a 802.1Q switch to work, the RX
> VID of a port needs to be seen as tagged egress on the CPU port.
> 
> While configuring the other front-panel ports to be part of this VID,
> for bridge scenarios, the untagged flag is applied even on the CPU port
> in dsa_switch_vlan_add.  This happens because DSA applies the same flags
> on the CPU port as on the (bridge-controlled) slave ports, and the
> effect in this case is that the CPU port tagged settings get deleted.
> 
> Instead of fixing DSA by introducing a way to control VLAN flags on the
> CPU port (and hence stop inheriting from the slave ports) - a hard,
> perhaps intractable problem - avoid this situation by moving the setup
> part of the RX VID on the CPU port after all the other front-panel ports
> have been added to the VID.
> 
> Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
> Signed-off-by: Vladimir Oltean <olteanv@...il.com>
> Fixes: f9bbe4477c30 ("net: dsa: Optional VLAN-based port separation for switches without tagging")

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian