[net-next] net: dsa: b53: Configure VLANs while not filtering

Update the B53 driver to support VLANs while not filtering. This
requires us to enable VLAN globally within the switch upon driver
initial configuration (dev->vlan_enabled).

We also need to remove the code that dealt with PVID re-configuration in
b53_vlan_filtering() since that function worked under the assumption
that it would only be called to make a bridge VLAN filtering, or not
filtering, and we would attempt to move the port's PVID accordingly.

Now that VLANs are programmed all the time, even in the case of a
non-VLAN filtering bridge, we would be programming a default_pvid for
the bridged switch ports.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/net/dsa/b53/b53_common.c | 23 ++++-------------------
 1 file changed, 4 insertions(+), 19 deletions(-)

On Thu, Sep 10, 2020 at 09:19:05PM -0700, Florian Fainelli wrote:
> Update the B53 driver to support VLANs while not filtering. This
> requires us to enable VLAN globally within the switch upon driver
> initial configuration (dev->vlan_enabled).
>
> We also need to remove the code that dealt with PVID re-configuration in
> b53_vlan_filtering() since that function worked under the assumption
> that it would only be called to make a bridge VLAN filtering, or not
> filtering, and we would attempt to move the port's PVID accordingly.
>
> Now that VLANs are programmed all the time, even in the case of a
> non-VLAN filtering bridge, we would be programming a default_pvid for
> the bridged switch ports.
>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> ---

Not sure it's worth a lot, but:

Acked-by: Vladimir Oltean <olteanv@gmail.com>

>  drivers/net/dsa/b53/b53_common.c | 23 ++++-------------------
>  1 file changed, 4 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
> index 6a5796c32721..46ac8875f870 100644
> --- a/drivers/net/dsa/b53/b53_common.c
> +++ b/drivers/net/dsa/b53/b53_common.c
> @@ -1377,23 +1377,6 @@ EXPORT_SYMBOL(b53_phylink_mac_link_up);
>  int b53_vlan_filtering(struct dsa_switch *ds, int port, bool vlan_filtering)
>  {
>  	struct b53_device *dev = ds->priv;
> -	u16 pvid, new_pvid;
> -
> -	b53_read16(dev, B53_VLAN_PAGE, B53_VLAN_PORT_DEF_TAG(port), &pvid);
> -	if (!vlan_filtering) {
> -		/* Filtering is currently enabled, use the default PVID since
> -		 * the bridge does not expect tagging anymore
> -		 */
> -		dev->ports[port].pvid = pvid;
> -		new_pvid = b53_default_pvid(dev);
> -	} else {
> -		/* Filtering is currently disabled, restore the previous PVID */
> -		new_pvid = dev->ports[port].pvid;
> -	}
> -
> -	if (pvid != new_pvid)
> -		b53_write16(dev, B53_VLAN_PAGE, B53_VLAN_PORT_DEF_TAG(port),
> -			    new_pvid);
>
>  	b53_enable_vlan(dev, dev->vlan_enabled, vlan_filtering);
>
> @@ -1444,7 +1427,7 @@ void 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);
> @@ -1482,7 +1465,7 @@ int b53_vlan_del(struct dsa_switch *ds, int port,
>  		if (pvid == 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, vid, vl);
> @@ -2619,6 +2602,8 @@ struct b53_device *b53_switch_alloc(struct device *base,
>  	dev->priv = priv;
>  	dev->ops = ops;
>  	ds->ops = &b53_switch_ops;
> +	ds->configure_vlan_while_not_filtering = true;
> +	dev->vlan_enabled = ds->configure_vlan_while_not_filtering;
>  	mutex_init(&dev->reg_mutex);
>  	mutex_init(&dev->stats_mutex);
>
> --
> 2.25.1
>

On 9/10/2020 9:19 PM, Florian Fainelli wrote:
> Update the B53 driver to support VLANs while not filtering. This
> requires us to enable VLAN globally within the switch upon driver
> initial configuration (dev->vlan_enabled).
> 
> We also need to remove the code that dealt with PVID re-configuration in
> b53_vlan_filtering() since that function worked under the assumption
> that it would only be called to make a bridge VLAN filtering, or not
> filtering, and we would attempt to move the port's PVID accordingly.
> 
> Now that VLANs are programmed all the time, even in the case of a
> non-VLAN filtering bridge, we would be programming a default_pvid for
> the bridged switch ports.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

David, Jakub, please hold off applying this just yet, Vladimir has 
submitted another patch for testing that would be IMHO a better way to 
deal with DSA switches that have an egress tagged default_pvid. 
Depending on the outcome of that patch, I will resubmit this one or 
request that you apply it.

Thanks

From: Florian Fainelli <f.fainelli@gmail.com>
Date: Fri, 11 Sep 2020 11:28:27 -0700

> 
> 
> On 9/10/2020 9:19 PM, Florian Fainelli wrote:
>> Update the B53 driver to support VLANs while not filtering. This
>> requires us to enable VLAN globally within the switch upon driver
>> initial configuration (dev->vlan_enabled).
>> We also need to remove the code that dealt with PVID re-configuration
>> in
>> b53_vlan_filtering() since that function worked under the assumption
>> that it would only be called to make a bridge VLAN filtering, or not
>> filtering, and we would attempt to move the port's PVID accordingly.
>> Now that VLANs are programmed all the time, even in the case of a
>> non-VLAN filtering bridge, we would be programming a default_pvid for
>> the bridged switch ports.
>> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> 
> David, Jakub, please hold off applying this just yet, Vladimir has
> submitted another patch for testing that would be IMHO a better way to
> deal with DSA switches that have an egress tagged
> default_pvid. Depending on the outcome of that patch, I will resubmit
> this one or request that you apply it.

Ok.