net: lan966x: Add support for offloading default prio

Add support for offloading default prio.
Reviewed-by: Daniel Machon <daniel.machon@microchip.com>
Reviewed-by: Piotr Raczynski <piotr.raczynski@intel.com>
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/microchip/lan966x/lan966x_dcb.c

@@ -64,6 +64,11 @@ static void lan966x_dcb_app_update(struct net_device *dev)
 		qos.dscp.map[i] = dcb_getapp(dev, &app_itr);
 	}
 
+	/* Get default prio */
+	qos.default_prio = dcb_ieee_getapp_default_prio_mask(dev);
+	if (qos.default_prio)
+		qos.default_prio = fls(qos.default_prio) - 1;
+
 	/* Enable use of pcp for queue classification */
 	if (lan966x_dcb_apptrust_contains(port->chip_port, DCB_APP_SEL_PCP))
 		qos.pcp.enable = true;
@@ -106,6 +111,13 @@ static int lan966x_dcb_app_validate(struct net_device *dev,
 	int err = 0;
 
 	switch (app->selector) {
+	/* Default priority checks */
+	case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
+		if (app->protocol)
+			err = -EINVAL;
+		else if (app->priority >= NUM_PRIO_QUEUES)
+			err = -ERANGE;
+		break;
 	/* Dscp checks */
 	case IEEE_8021QAZ_APP_SEL_DSCP:
 		if (app->protocol >= LAN966X_PORT_QOS_DSCP_COUNT)

drivers/net/ethernet/microchip/lan966x/lan966x_main.h

@@ -412,6 +412,7 @@ struct lan966x_port_qos_dscp {
 struct lan966x_port_qos {
 	struct lan966x_port_qos_pcp pcp;
 	struct lan966x_port_qos_dscp dscp;
+	u8 default_prio;
 };
 
 struct lan966x_port {

drivers/net/ethernet/microchip/lan966x/lan966x_port.c

@@ -443,11 +443,32 @@ static void lan966x_port_qos_dscp_set(struct lan966x_port *port,
 			lan966x, ANA_DSCP_CFG(i));
 }
 
+static int lan966x_port_qos_default_set(struct lan966x_port *port,
+					struct lan966x_port_qos *qos)
+{
+	/* Set default prio and dp level */
+	lan_rmw(ANA_QOS_CFG_DP_DEFAULT_VAL_SET(0) |
+		ANA_QOS_CFG_QOS_DEFAULT_VAL_SET(qos->default_prio),
+		ANA_QOS_CFG_DP_DEFAULT_VAL |
+		ANA_QOS_CFG_QOS_DEFAULT_VAL,
+		port->lan966x, ANA_QOS_CFG(port->chip_port));
+
+	/* Set default pcp and dei for untagged frames */
+	lan_rmw(ANA_VLAN_CFG_VLAN_DEI_SET(0) |
+		ANA_VLAN_CFG_VLAN_PCP_SET(0),
+		ANA_VLAN_CFG_VLAN_DEI |
+		ANA_VLAN_CFG_VLAN_PCP,
+		port->lan966x, ANA_VLAN_CFG(port->chip_port));
+
+	return 0;
+}
+
 void lan966x_port_qos_set(struct lan966x_port *port,
 			  struct lan966x_port_qos *qos)
 {
 	lan966x_port_qos_pcp_set(port, &qos->pcp);
 	lan966x_port_qos_dscp_set(port, &qos->dscp);
+	lan966x_port_qos_default_set(port, qos);
 }
 
 void lan966x_port_init(struct lan966x_port *port)