netdev - [PATCH net-next] net: dsa: b53: Create default VLAN entry explicitly

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Date:   Thu, 10 Jun 2021 20:57:32 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net-next] net: dsa: b53: Create default VLAN entry explicitly

In case CONFIG_VLAN_8021Q is not set, there will be no call down to the
b53 driver to ensure that the default PVID VLAN entry will be configured
with the appropriate untagged attribute towards the CPU port. We were
implicitly relying on dsa_slave_vlan_rx_add_vid() to do that for us,
instead make it explicit.

Reported-by: Vladimir Oltean <olteanv@...il.com>
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/dsa/b53/b53_common.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 6e199454e41d..5fd9ed327c1b 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -748,9 +748,20 @@ int b53_configure_vlan(struct dsa_switch *ds)
 
 	b53_enable_vlan(dev, -1, dev->vlan_enabled, ds->vlan_filtering);
 
-	b53_for_each_port(dev, i)
+	/* Create an untagged VLAN entry for the default PVID in case
+	 * CONFIG_VLAN_8021Q is disabled and there are no calls to
+	 * dsa_slave_vlan_rx_add_vid() to create the default VLAN
+	 * entry. Do this only when the tagging protocol is not
+	 * DSA_TAG_PROTO_NONE
+	 */
+	b53_for_each_port(dev, i) {
+		v = &dev->vlans[def_vid];
+		v->members |= BIT(i);
+		if (dev->tag_protocol != DSA_TAG_PROTO_NONE)
+			v->untag = v->members;
 		b53_write16(dev, B53_VLAN_PAGE,
 			    B53_VLAN_PORT_DEF_TAG(i), def_vid);
+	}
 
 	/* Upon initial call we have not set-up any VLANs, but upon
 	 * system resume, we need to restore all VLAN entries.
-- 
2.25.1