netdev - Re: [PATCH v5 net-next 2/5] net: dsa: Don't offload port attributes on standalone ports

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Date:   Thu, 14 Jan 2021 02:36:05 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Tobias Waldekranz <tobias@...dekranz.com>
Cc:     davem@...emloft.net, kuba@...nel.org, andrew@...n.ch,
        vivien.didelot@...il.com, f.fainelli@...il.com,
        j.vosburgh@...il.com, vfalico@...il.com, andy@...yhouse.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH v5 net-next 2/5] net: dsa: Don't offload port attributes
 on standalone ports

On Wed, Jan 13, 2021 at 09:42:52AM +0100, Tobias Waldekranz wrote:
> In a situation where a standalone port is indirectly attached to a
> bridge (e.g. via a LAG) which is not offloaded, do not offload any
> port attributes either. The port should behave as a standard NIC.
> 
> Previously, on mv88e6xxx, this meant that in the following setup:
> 
>      br0
>      /
>   team0
>    / \
> swp0 swp1
> 
> If vlan filtering was enabled on br0, swp0's and swp1's QMode was set
> to "secure". This caused all untagged packets to be dropped, as their
> default VID (0) was not loaded into the VTU.
> 
> Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
> ---

Reviewed-by: Vladimir Oltean <olteanv@...il.com>