linux-kernel - Re: [PATCH net-next v2] net: dsa: b53: Do not force CPU to be always tagged

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Message-ID: <a2201578-6e65-80ca-d685-97705c298740@gmail.com>
Date:   Wed, 9 Jun 2021 12:23:32 +0100
From:   Matthew Hagan <mnhagan88@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2] net: dsa: b53: Do not force CPU to be always
 tagged

On 08/06/2021 22:22, Florian Fainelli wrote:

> Commit ca8931948344 ("net: dsa: b53: Keep CPU port as tagged in all
> VLANs") forced the CPU port to be always tagged in any VLAN membership.
> This was necessary back then because we did not support Broadcom tags
> for all configurations so the only way to differentiate tagged and
> untagged traffic while DSA_TAG_PROTO_NONE was used was to force the CPU
> port into being always tagged.
>
> With most configurations enabling Broadcom tags, especially after
> 8fab459e69ab ("net: dsa: b53: Enable Broadcom tags for 531x5/539x
> families") we do not need to apply this unconditional force tagging of
> the CPU port in all VLANs.
>
> A helper function is introduced to faciliate the encapsulation of the
> specific condition requiring the CPU port to be tagged in all VLANs and
> the dsa_switch_ops::untag_bridge_pvid boolean is moved to when
> dsa_switch_ops::setup is called when we have already determined the
> tagging protocol we will be using.
>
> Reported-by: Matthew Hagan <mnhagan88@...il.com>
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---

Tested-by: Matthew Hagan <mnhagan88@...il.com>