linux-kernel - Re: [PATCH net-next 1/2] net: dsa: b53: Do not force tagging on CPU port VLANs

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Date:   Tue, 8 Jun 2021 01:22:50 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, Matthew Hagan <mnhagan88@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...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 1/2] net: dsa: b53: Do not force tagging on CPU
 port VLANs

On Mon, Jun 07, 2021 at 03:08:42PM -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.
> 
> This is not necessary anymore since 8fab459e69ab ("net: dsa: b53: Enable
> Broadcom tags for 531x5/539x families") and we can simply program what
> we are being told now, regardless of the port being CPU or user-facing.
> 
> Reported-by: Matthew Hagan <mnhagan88@...il.com>
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  drivers/net/dsa/b53/b53_common.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
> index 3ca6b394dd5f..56e3b42ec28c 100644
> --- a/drivers/net/dsa/b53/b53_common.c
> +++ b/drivers/net/dsa/b53/b53_common.c
> @@ -1477,7 +1477,7 @@ int b53_vlan_add(struct dsa_switch *ds, int port,
>  		untagged = true;
>  
>  	vl->members |= BIT(port);
> -	if (untagged && !dsa_is_cpu_port(ds, port))
> +	if (untagged)
>  		vl->untag |= BIT(port);
>  	else
>  		vl->untag &= ~BIT(port);
> @@ -1514,7 +1514,7 @@ int b53_vlan_del(struct dsa_switch *ds, int port,
>  	if (pvid == vlan->vid)
>  		pvid = b53_default_pvid(dev);
>  
> -	if (untagged && !dsa_is_cpu_port(ds, port))
> +	if (untagged)
>  		vl->untag &= ~(BIT(port));
>  
>  	b53_set_vlan_entry(dev, vlan->vid, vl);
> -- 
> 2.25.1
> 

Don't you want to keep this functionality for BCM5325 / BCM5365 and
such, which still use DSA_TAG_PROTO_NONE?