netdev - [PATCH net-next 1/3] net: dsa: sja1105: reset the port pvid when leaving a VLAN-aware bridge

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Date:   Thu, 29 Jul 2021 00:54:27 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>
Subject: [PATCH net-next 1/3] net: dsa: sja1105: reset the port pvid when leaving a VLAN-aware bridge

Now that we no longer have the ultra-central sja1105_build_vlan_table(),
we need to be more careful about checking all corner cases manually.

For example, when a port leaves a VLAN-aware bridge, it becomes
standalone so its pvid should become a tag_8021q RX VLAN again. However,
sja1105_commit_pvid() only gets called from sja1105_bridge_vlan_add()
and from sja1105_vlan_filtering(), and no VLAN awareness change takes
place (VLAN filtering is a global setting for sja1105, so the switch
remains VLAN-aware overall).

This means that we need to put another sja1105_commit_pvid() call in
sja1105_bridge_member().

Fixes: 6dfd23d35e75 ("net: dsa: sja1105: delete vlan delta save/restore logic")
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/dsa/sja1105/sja1105_main.c | 62 ++++++++++++++------------
 1 file changed, 33 insertions(+), 29 deletions(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 3047704c24d3..293c77622657 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -57,6 +57,35 @@ static bool sja1105_can_forward(struct sja1105_l2_forwarding_entry *l2_fwd,
 	return !!(l2_fwd[from].reach_port & BIT(to));
 }
 
+static int sja1105_pvid_apply(struct sja1105_private *priv, int port, u16 pvid)
+{
+	struct sja1105_mac_config_entry *mac;
+
+	mac = priv->static_config.tables[BLK_IDX_MAC_CONFIG].entries;
+
+	if (mac[port].vlanid == pvid)
+		return 0;
+
+	mac[port].vlanid = pvid;
+
+	return sja1105_dynamic_config_write(priv, BLK_IDX_MAC_CONFIG, port,
+					    &mac[port], true);
+}
+
+static int sja1105_commit_pvid(struct dsa_switch *ds, int port)
+{
+	struct dsa_port *dp = dsa_to_port(ds, port);
+	struct sja1105_private *priv = ds->priv;
+	u16 pvid;
+
+	if (dp->bridge_dev && br_vlan_enabled(dp->bridge_dev))
+		pvid = priv->bridge_pvid[port];
+	else
+		pvid = priv->tag_8021q_pvid[port];
+
+	return sja1105_pvid_apply(priv, port, pvid);
+}
+
 static int sja1105_init_mac_settings(struct sja1105_private *priv)
 {
 	struct sja1105_mac_config_entry default_mac = {
@@ -1656,6 +1685,10 @@ static int sja1105_bridge_member(struct dsa_switch *ds, int port,
 	if (rc)
 		return rc;
 
+	rc = sja1105_commit_pvid(ds, port);
+	if (rc)
+		return rc;
+
 	return sja1105_manage_flood_domains(priv);
 }
 
@@ -1955,35 +1988,6 @@ int sja1105_static_config_reload(struct sja1105_private *priv,
 	return rc;
 }
 
-static int sja1105_pvid_apply(struct sja1105_private *priv, int port, u16 pvid)
-{
-	struct sja1105_mac_config_entry *mac;
-
-	mac = priv->static_config.tables[BLK_IDX_MAC_CONFIG].entries;
-
-	if (mac[port].vlanid == pvid)
-		return 0;
-
-	mac[port].vlanid = pvid;
-
-	return sja1105_dynamic_config_write(priv, BLK_IDX_MAC_CONFIG, port,
-					   &mac[port], true);
-}
-
-static int sja1105_commit_pvid(struct dsa_switch *ds, int port)
-{
-	struct dsa_port *dp = dsa_to_port(ds, port);
-	struct sja1105_private *priv = ds->priv;
-	u16 pvid;
-
-	if (dp->bridge_dev && br_vlan_enabled(dp->bridge_dev))
-		pvid = priv->bridge_pvid[port];
-	else
-		pvid = priv->tag_8021q_pvid[port];
-
-	return sja1105_pvid_apply(priv, port, pvid);
-}
-
 static enum dsa_tag_protocol
 sja1105_get_tag_protocol(struct dsa_switch *ds, int port,
 			 enum dsa_tag_protocol mp)
-- 
2.25.1