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

[Vladimir Oltean]

On Tue, Jun 08, 2021 at 02:22:04PM -0700, 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@xxxxxxxxx>
> Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
> ---

Florian, does the hardware behave in the same way if you disable
CONFIG_VLAN_8021Q?