net: lan966x: Add lag support for lan966x

Add link aggregation hardware offload support for lan966x

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 73 insertions, 19 deletions

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
index c4951eeb6636..5bf574111bce 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
@@ -130,7 +130,7 @@ static int lan966x_port_pre_bridge_flags(struct lan966x_port *port,
 	return 0;
 }
 
-static void lan966x_update_fwd_mask(struct lan966x *lan966x)
+void lan966x_update_fwd_mask(struct lan966x *lan966x)
 {
 	int i;
 
@@ -138,9 +138,14 @@ static void lan966x_update_fwd_mask(struct lan966x *lan966x)
 		struct lan966x_port *port = lan966x->ports[i];
 		unsigned long mask = 0;
 
-		if (port && lan966x->bridge_fwd_mask & BIT(i))
+		if (port && lan966x->bridge_fwd_mask & BIT(i)) {
 			mask = lan966x->bridge_fwd_mask & ~BIT(i);
 
+			if (port->bond)
+				mask &= ~lan966x_lag_get_mask(lan966x,
+							      port->bond);
+		}
+
 		mask |= BIT(CPU_PORT);
 
 		lan_wr(ANA_PGID_PGID_SET(mask),
@@ -148,7 +153,7 @@ static void lan966x_update_fwd_mask(struct lan966x *lan966x)
 	}
 }
 
-static void lan966x_port_stp_state_set(struct lan966x_port *port, u8 state)
+void lan966x_port_stp_state_set(struct lan966x_port *port, u8 state)
 {
 	struct lan966x *lan966x = port->lan966x;
 	bool learn_ena = false;
@@ -169,8 +174,8 @@ static void lan966x_port_stp_state_set(struct lan966x_port *port, u8 state)
 	lan966x_update_fwd_mask(lan966x);
 }
 
-static void lan966x_port_ageing_set(struct lan966x_port *port,
-				    unsigned long ageing_clock_t)
+void lan966x_port_ageing_set(struct lan966x_port *port,
+			     unsigned long ageing_clock_t)
 {
 	unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock_t);
 	u32 ageing_time = jiffies_to_msecs(ageing_jiffies) / 1000;
@@ -239,6 +244,7 @@ static int lan966x_port_attr_set(struct net_device *dev, const void *ctx,
 }
 
 static int lan966x_port_bridge_join(struct lan966x_port *port,
+				    struct net_device *brport_dev,
 				    struct net_device *bridge,
 				    struct netlink_ext_ack *extack)
 {
@@ -256,7 +262,7 @@ static int lan966x_port_bridge_join(struct lan966x_port *port,
 		}
 	}
 
-	err = switchdev_bridge_port_offload(dev, dev, port,
+	err = switchdev_bridge_port_offload(brport_dev, dev, port,
 					    &lan966x_switchdev_nb,
 					    &lan966x_switchdev_blocking_nb,
 					    false, extack);
@@ -293,8 +299,9 @@ static void lan966x_port_bridge_leave(struct lan966x_port *port,
 	lan966x_vlan_port_apply(port);
 }
 
-static int lan966x_port_changeupper(struct net_device *dev,
-				    struct netdev_notifier_changeupper_info *info)
+int lan966x_port_changeupper(struct net_device *dev,
+			     struct net_device *brport_dev,
+			     struct netdev_notifier_changeupper_info *info)
 {
 	struct lan966x_port *port = netdev_priv(dev);
 	struct netlink_ext_ack *extack;
@@ -304,26 +311,46 @@ static int lan966x_port_changeupper(struct net_device *dev,
 
 	if (netif_is_bridge_master(info->upper_dev)) {
 		if (info->linking)
-			err = lan966x_port_bridge_join(port, info->upper_dev,
+			err = lan966x_port_bridge_join(port, brport_dev,
+						       info->upper_dev,
 						       extack);
 		else
 			lan966x_port_bridge_leave(port, info->upper_dev);
 	}
 
+	if (netif_is_lag_master(info->upper_dev)) {
+		if (info->linking)
+			err = lan966x_lag_port_join(port, info->upper_dev,
+						    info->upper_dev,
+						    extack);
+		else
+			lan966x_lag_port_leave(port, info->upper_dev);
+	}
+
 	return err;
 }
 
-static int lan966x_port_prechangeupper(struct net_device *dev,
-				       struct netdev_notifier_changeupper_info *info)
+int lan966x_port_prechangeupper(struct net_device *dev,
+				struct net_device *brport_dev,
+				struct netdev_notifier_changeupper_info *info)
 {
 	struct lan966x_port *port = netdev_priv(dev);
+	int err = NOTIFY_DONE;
 
 	if (netif_is_bridge_master(info->upper_dev) && !info->linking) {
 		switchdev_bridge_port_unoffload(port->dev, port, NULL, NULL);
 		lan966x_fdb_flush_workqueue(port->lan966x);
 	}
 
-	return NOTIFY_DONE;
+	if (netif_is_lag_master(info->upper_dev)) {
+		err = lan966x_lag_port_prechangeupper(dev, info);
+		if (err || info->linking)
+			return err;
+
+		switchdev_bridge_port_unoffload(brport_dev, port, NULL, NULL);
+	}
+
+	return err;
 }
 
 static int lan966x_foreign_bridging_check(struct net_device *upper,
@@ -401,21 +428,44 @@ static int lan966x_netdevice_port_event(struct net_device *dev,
 	int err = 0;
 
 	if (!lan966x_netdevice_check(dev)) {
-		if (event == NETDEV_CHANGEUPPER)
-			return lan966x_bridge_check(dev, ptr);
+		switch (event) {
+		case NETDEV_CHANGEUPPER:
+		case NETDEV_PRECHANGEUPPER:
+			err = lan966x_bridge_check(dev, ptr);
+			if (err)
+				return err;
+
+			if (netif_is_lag_master(dev)) {
+				if (event == NETDEV_CHANGEUPPER)
+					err = lan966x_lag_netdev_changeupper(dev,
+									     ptr);
+				else
+					err = lan966x_lag_netdev_prechangeupper(dev,
+										ptr);
+
+				return err;
+			}
+			break;
+		default:
+			return 0;
+		}
+
 		return 0;
 	}
 
 	switch (event) {
 	case NETDEV_PRECHANGEUPPER:
-		err = lan966x_port_prechangeupper(dev, ptr);
+		err = lan966x_port_prechangeupper(dev, dev, ptr);
 		break;
 	case NETDEV_CHANGEUPPER:
 		err = lan966x_bridge_check(dev, ptr);
 		if (err)
 			return err;
 
-		err = lan966x_port_changeupper(dev, ptr);
+		err = lan966x_port_changeupper(dev, dev, ptr);
+		break;
+	case NETDEV_CHANGELOWERSTATE:
+		err = lan966x_lag_port_changelowerstate(dev, ptr);
 		break;
 	}
 
@@ -433,19 +483,23 @@ static int lan966x_netdevice_event(struct notifier_block *nb,
 	return notifier_from_errno(ret);
 }
 
-/* We don't offload uppers such as LAG as bridge ports, so every device except
- * the bridge itself is foreign.
- */
 static bool lan966x_foreign_dev_check(const struct net_device *dev,
 				      const struct net_device *foreign_dev)
 {
 	struct lan966x_port *port = netdev_priv(dev);
 	struct lan966x *lan966x = port->lan966x;
+	int i;
 
 	if (netif_is_bridge_master(foreign_dev))
 		if (lan966x->bridge == foreign_dev)
 			return false;
 
+	if (netif_is_lag_master(foreign_dev))
+		for (i = 0; i < lan966x->num_phys_ports; ++i)
+			if (lan966x->ports[i] &&
+			    lan966x->ports[i]->bond == foreign_dev)
+				return false;
+
 	return true;
 }