net: dsa: sja1105: Hide the dsa_8021q VLANs from the bridge fdb command

TX VLANs and RX VLANs are an internal implementation detail of DSA for
frame tagging.  They work by installing special VLANs on switch ports in
the operating modes where no behavior change w.r.t. VLANs can be
observed by the user.

Therefore it makes sense to hide these VLANs in the 'bridge fdb'
command, as well as translate the pvid into the RX VID and TX VID on
'bridge fdb add' and 'bridge fdb del' commands.

Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/sja1105/sja1105_main.c

@@ -1006,15 +1006,43 @@ static int sja1105_fdb_add(struct dsa_switch *ds, int port,
 			   const unsigned char *addr, u16 vid)
 {
 	struct sja1105_private *priv = ds->priv;
+	int rc;
+
+	/* Since we make use of VLANs even when the bridge core doesn't tell us
+	 * to, translate these FDB entries into the correct dsa_8021q ones.
+	 */
+	if (!dsa_port_is_vlan_filtering(&ds->ports[port])) {
+		unsigned int upstream = dsa_upstream_port(priv->ds, port);
+		u16 tx_vid = dsa_8021q_tx_vid(ds, port);
+		u16 rx_vid = dsa_8021q_rx_vid(ds, port);
 
+		rc = priv->info->fdb_add_cmd(ds, port, addr, tx_vid);
+		if (rc < 0)
+			return rc;
+		return priv->info->fdb_add_cmd(ds, upstream, addr, rx_vid);
+	}
 	return priv->info->fdb_add_cmd(ds, port, addr, vid);
 }
 
 static int sja1105_fdb_del(struct dsa_switch *ds, int port,
 			   const unsigned char *addr, u16 vid)
 {
 	struct sja1105_private *priv = ds->priv;
+	int rc;
 
+	/* Since we make use of VLANs even when the bridge core doesn't tell us
+	 * to, translate these FDB entries into the correct dsa_8021q ones.
+	 */
+	if (!dsa_port_is_vlan_filtering(&ds->ports[port])) {
+		unsigned int upstream = dsa_upstream_port(priv->ds, port);
+		u16 tx_vid = dsa_8021q_tx_vid(ds, port);
+		u16 rx_vid = dsa_8021q_rx_vid(ds, port);
+
+		rc = priv->info->fdb_del_cmd(ds, port, addr, tx_vid);
+		if (rc < 0)
+			return rc;
+		return priv->info->fdb_del_cmd(ds, upstream, addr, rx_vid);
+	}
 	return priv->info->fdb_del_cmd(ds, port, addr, vid);
 }
 
@@ -1049,6 +1077,15 @@ static int sja1105_fdb_dump(struct dsa_switch *ds, int port,
 		if (!(l2_lookup.destports & BIT(port)))
 			continue;
 		u64_to_ether_addr(l2_lookup.macaddr, macaddr);
+
+		/* We need to hide the dsa_8021q VLAN from the user.
+		 * Convert the TX VID into the pvid that is active in
+		 * standalone and non-vlan_filtering modes, aka 1.
+		 * The RX VID is applied on the CPU port, which is not seen by
+		 * the bridge core anyway, so there's nothing to hide.
+		 */
+		if (!dsa_port_is_vlan_filtering(&ds->ports[port]))
+			l2_lookup.vlanid = 1;
 		cb(macaddr, l2_lookup.vlanid, false, data);
 	}
 	return 0;