netdev - Re: [PATCH v2 net-next 1/5] net: dsa: mv88e6xxx: Mark chips with undocumented EDSA tag support

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Date:   Thu, 15 Apr 2021 19:04:46 +0300
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,
        netdev@...r.kernel.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 net-next 1/5] net: dsa: mv88e6xxx: Mark chips with
 undocumented EDSA tag support

On Thu, Apr 15, 2021 at 11:26:06AM +0200, Tobias Waldekranz wrote:
> All devices are capable of using regular DSA tags. Support for
> Ethertyped DSA tags sort into three categories:
> 
> 1. No support. Older chips fall into this category.
> 
> 2. Full support. Datasheet explicitly supports configuring the CPU
>    port to receive FORWARDs with a DSA tag.
> 
> 3. Undocumented support. Datasheet lists the configuration from
>    category 2 as "reserved for future use", but does empirically
>    behave like a category 2 device.
> 
> So, instead of listing the one true protocol that should be used by a
> particular chip, specify the level of support for EDSA (support for
> regular DSA is implicit on all chips). As before, we use EDSA for all
> chips that fully supports it.
> 
> In upcoming changes, we will use this information to support
> dynamically changing the tag protocol.
> 
> Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
> ---

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