Merge branch 'lan966x-lag-support'

Horatiu Vultur says:

====================
net: lan966x: Add lag support

Add lag support for lan966x.
First 4 patches don't do any changes to the current behaviour, they
just prepare for lag support. While the rest is to add the lag support.

v3->v4:
- aggregation configuration is global for all bonds, so make sure that
  there can't be enabled multiple configurations at the same time
- return error faster from lan966x_foreign_bridging_check, don't
  continue the search if the error is seen already
- flush fdb workqueue when a port leaves a bridge or lag.

v2->v3:
- return error code from 'switchdev_bridge_port_offload()'
- fix lan966x_foreign_dev_check(), it was missing lag support
- remove lan966x_lag_mac_add_entry and lan966x_mac_del_entry as
  they are not needed
- fix race conditions when accessing port->bond
- move FDB entries when a new port joins the lag if it has a lower

v1->v2:
- fix the LAG PGIDs when ports go down, in this way is not
  needed anymore the last patch of the series.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

Author: davem330

drivers/net/ethernet/microchip/lan966x/Kconfig

@@ -4,6 +4,7 @@ config LAN966X_SWITCH
 	depends on HAS_IOMEM
 	depends on OF
 	depends on NET_SWITCHDEV
+	depends on BRIDGE || BRIDGE=n
 	select PHYLINK
 	select PACKING
 	help

drivers/net/ethernet/microchip/lan966x/Makefile

@@ -8,4 +8,4 @@ obj-$(CONFIG_LAN966X_SWITCH) += lan966x-switch.o
 lan966x-switch-objs  := lan966x_main.o lan966x_phylink.o lan966x_port.o \
 			lan966x_mac.o lan966x_ethtool.o lan966x_switchdev.o \
 			lan966x_vlan.o lan966x_fdb.o lan966x_mdb.o \
-			lan966x_ptp.o lan966x_fdma.o
+			lan966x_ptp.o lan966x_fdma.o lan966x_lag.o

drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c

@@ -8,6 +8,7 @@ struct lan966x_fdb_event_work {
 	struct work_struct work;
 	struct switchdev_notifier_fdb_info fdb_info;
 	struct net_device *dev;
+	struct net_device *orig_dev;
 	struct lan966x *lan966x;
 	unsigned long event;
 };
@@ -127,75 +128,119 @@ void lan966x_fdb_deinit(struct lan966x *lan966x)
 	lan966x_fdb_purge_entries(lan966x);
 }
 
-static void lan966x_fdb_event_work(struct work_struct *work)
+void lan966x_fdb_flush_workqueue(struct lan966x *lan966x)
+{
+	flush_workqueue(lan966x->fdb_work);
+}
+
+static void lan966x_fdb_port_event_work(struct lan966x_fdb_event_work *fdb_work)
 {
-	struct lan966x_fdb_event_work *fdb_work =
-		container_of(work, struct lan966x_fdb_event_work, work);
 	struct switchdev_notifier_fdb_info *fdb_info;
-	struct net_device *dev = fdb_work->dev;
 	struct lan966x_port *port;
 	struct lan966x *lan966x;
-	int ret;
 
-	fdb_info = &fdb_work->fdb_info;
 	lan966x = fdb_work->lan966x;
+	port = netdev_priv(fdb_work->orig_dev);
+	fdb_info = &fdb_work->fdb_info;
 
-	if (lan966x_netdevice_check(dev)) {
-		port = netdev_priv(dev);
+	switch (fdb_work->event) {
+	case SWITCHDEV_FDB_ADD_TO_DEVICE:
+		if (!fdb_info->added_by_user)
+			break;
+		lan966x_mac_add_entry(lan966x, port, fdb_info->addr,
+				      fdb_info->vid);
+		break;
+	case SWITCHDEV_FDB_DEL_TO_DEVICE:
+		if (!fdb_info->added_by_user)
+			break;
+		lan966x_mac_del_entry(lan966x, fdb_info->addr,
+				      fdb_info->vid);
+		break;
+	}
+}
+
+static void lan966x_fdb_bridge_event_work(struct lan966x_fdb_event_work *fdb_work)
+{
+	struct switchdev_notifier_fdb_info *fdb_info;
+	struct lan966x *lan966x;
+	int ret;
 
-		switch (fdb_work->event) {
-		case SWITCHDEV_FDB_ADD_TO_DEVICE:
-			if (!fdb_info->added_by_user)
-				break;
-			lan966x_mac_add_entry(lan966x, port, fdb_info->addr,
-					      fdb_info->vid);
+	lan966x = fdb_work->lan966x;
+	fdb_info = &fdb_work->fdb_info;
+
+	/* In case the bridge is called */
+	switch (fdb_work->event) {
+	case SWITCHDEV_FDB_ADD_TO_DEVICE:
+		/* If there is no front port in this vlan, there is no
+		 * point to copy the frame to CPU because it would be
+		 * just dropped at later point. So add it only if
+		 * there is a port but it is required to store the fdb
+		 * entry for later point when a port actually gets in
+		 * the vlan.
+		 */
+		lan966x_fdb_add_entry(lan966x, fdb_info);
+		if (!lan966x_vlan_cpu_member_cpu_vlan_mask(lan966x,
+							   fdb_info->vid))
 			break;
-		case SWITCHDEV_FDB_DEL_TO_DEVICE:
-			if (!fdb_info->added_by_user)
-				break;
-			lan966x_mac_del_entry(lan966x, fdb_info->addr,
-					      fdb_info->vid);
+
+		lan966x_mac_cpu_learn(lan966x, fdb_info->addr,
+				      fdb_info->vid);
+		break;
+	case SWITCHDEV_FDB_DEL_TO_DEVICE:
+		ret = lan966x_fdb_del_entry(lan966x, fdb_info);
+		if (!lan966x_vlan_cpu_member_cpu_vlan_mask(lan966x,
+							   fdb_info->vid))
 			break;
-		}
-	} else {
-		if (!netif_is_bridge_master(dev))
-			goto out;
-
-		/* In case the bridge is called */
-		switch (fdb_work->event) {
-		case SWITCHDEV_FDB_ADD_TO_DEVICE:
-			/* If there is no front port in this vlan, there is no
-			 * point to copy the frame to CPU because it would be
-			 * just dropped at later point. So add it only if
-			 * there is a port but it is required to store the fdb
-			 * entry for later point when a port actually gets in
-			 * the vlan.
-			 */
-			lan966x_fdb_add_entry(lan966x, fdb_info);
-			if (!lan966x_vlan_cpu_member_cpu_vlan_mask(lan966x,
-								   fdb_info->vid))
-				break;
-
-			lan966x_mac_cpu_learn(lan966x, fdb_info->addr,
-					      fdb_info->vid);
+
+		if (ret)
+			lan966x_mac_cpu_forget(lan966x, fdb_info->addr,
+					       fdb_info->vid);
+		break;
+	}
+}
+
+static void lan966x_fdb_lag_event_work(struct lan966x_fdb_event_work *fdb_work)
+{
+	struct switchdev_notifier_fdb_info *fdb_info;
+	struct lan966x_port *port;
+	struct lan966x *lan966x;
+
+	if (!lan966x_lag_first_port(fdb_work->orig_dev, fdb_work->dev))
+		return;
+
+	lan966x = fdb_work->lan966x;
+	port = netdev_priv(fdb_work->dev);
+	fdb_info = &fdb_work->fdb_info;
+
+	switch (fdb_work->event) {
+	case SWITCHDEV_FDB_ADD_TO_DEVICE:
+		if (!fdb_info->added_by_user)
 			break;
-		case SWITCHDEV_FDB_DEL_TO_DEVICE:
-			ret = lan966x_fdb_del_entry(lan966x, fdb_info);
-			if (!lan966x_vlan_cpu_member_cpu_vlan_mask(lan966x,
-								   fdb_info->vid))
-				break;
-
-			if (ret)
-				lan966x_mac_cpu_forget(lan966x, fdb_info->addr,
-						       fdb_info->vid);
+		lan966x_mac_add_entry(lan966x, port, fdb_info->addr,
+				      fdb_info->vid);
+		break;
+	case SWITCHDEV_FDB_DEL_TO_DEVICE:
+		if (!fdb_info->added_by_user)
 			break;
-		}
+		lan966x_mac_del_entry(lan966x, fdb_info->addr, fdb_info->vid);
+		break;
 	}
+}
+
+static void lan966x_fdb_event_work(struct work_struct *work)
+{
+	struct lan966x_fdb_event_work *fdb_work =
+		container_of(work, struct lan966x_fdb_event_work, work);
+
+	if (lan966x_netdevice_check(fdb_work->orig_dev))
+		lan966x_fdb_port_event_work(fdb_work);
+	else if (netif_is_bridge_master(fdb_work->orig_dev))
+		lan966x_fdb_bridge_event_work(fdb_work);
+	else if (netif_is_lag_master(fdb_work->orig_dev))
+		lan966x_fdb_lag_event_work(fdb_work);
 
-out:
 	kfree(fdb_work->fdb_info.addr);
 	kfree(fdb_work);
-	dev_put(dev);
 }
 
 int lan966x_handle_fdb(struct net_device *dev,
@@ -221,7 +266,8 @@ int lan966x_handle_fdb(struct net_device *dev,
 		if (!fdb_work)
 			return -ENOMEM;
 
-		fdb_work->dev = orig_dev;
+		fdb_work->dev = dev;
+		fdb_work->orig_dev = orig_dev;
 		fdb_work->lan966x = lan966x;
 		fdb_work->event = event;
 		INIT_WORK(&fdb_work->work, lan966x_fdb_event_work);
@@ -231,7 +277,6 @@ int lan966x_handle_fdb(struct net_device *dev,
 			goto err_addr_alloc;
 
 		ether_addr_copy((u8 *)fdb_work->fdb_info.addr, fdb_info->addr);
-		dev_hold(orig_dev);
 
 		queue_work(lan966x->fdb_work, &fdb_work->work);
 		break;