net: introduce default neigh_construct/destroy ndo calls for L2 upper devices

L2 upper device needs to propagate neigh_construct/destroy calls down to
lower devices. Do this by defining default ndo functions and use them in
team, bond, bridge and vlan.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bonding/bond_main.c

@@ -4137,6 +4137,8 @@ static const struct net_device_ops bond_netdev_ops = {
 	.ndo_add_slave		= bond_enslave,
 	.ndo_del_slave		= bond_release,
 	.ndo_fix_features	= bond_fix_features,
+	.ndo_neigh_construct	= netdev_default_l2upper_neigh_construct,
+	.ndo_neigh_destroy	= netdev_default_l2upper_neigh_destroy,
 	.ndo_bridge_setlink	= switchdev_port_bridge_setlink,
 	.ndo_bridge_getlink	= switchdev_port_bridge_getlink,
 	.ndo_bridge_dellink	= switchdev_port_bridge_dellink,

drivers/net/team/team.c

@@ -2002,6 +2002,8 @@ static const struct net_device_ops team_netdev_ops = {
 	.ndo_add_slave		= team_add_slave,
 	.ndo_del_slave		= team_del_slave,
 	.ndo_fix_features	= team_fix_features,
+	.ndo_neigh_construct	= netdev_default_l2upper_neigh_construct,
+	.ndo_neigh_destroy	= netdev_default_l2upper_neigh_destroy,
 	.ndo_change_carrier     = team_change_carrier,
 	.ndo_bridge_setlink	= switchdev_port_bridge_setlink,
 	.ndo_bridge_getlink	= switchdev_port_bridge_getlink,

include/linux/netdevice.h

@@ -3845,6 +3845,10 @@ void *netdev_lower_dev_get_private(struct net_device *dev,
 				   struct net_device *lower_dev);
 void netdev_lower_state_changed(struct net_device *lower_dev,
 				void *lower_state_info);
+int netdev_default_l2upper_neigh_construct(struct net_device *dev,
+					   struct neighbour *n);
+void netdev_default_l2upper_neigh_destroy(struct net_device *dev,
+					  struct neighbour *n);
 
 /* RSS keys are 40 or 52 bytes long */
 #define NETDEV_RSS_KEY_LEN 52

net/8021q/vlan_dev.c

@@ -790,6 +790,8 @@ static const struct net_device_ops vlan_netdev_ops = {
 	.ndo_netpoll_cleanup	= vlan_dev_netpoll_cleanup,
 #endif
 	.ndo_fix_features	= vlan_dev_fix_features,
+	.ndo_neigh_construct	= netdev_default_l2upper_neigh_construct,
+	.ndo_neigh_destroy	= netdev_default_l2upper_neigh_destroy,
 	.ndo_fdb_add		= switchdev_port_fdb_add,
 	.ndo_fdb_del		= switchdev_port_fdb_del,
 	.ndo_fdb_dump		= switchdev_port_fdb_dump,

net/bridge/br_device.c

@@ -349,6 +349,8 @@ static const struct net_device_ops br_netdev_ops = {
 	.ndo_add_slave		 = br_add_slave,
 	.ndo_del_slave		 = br_del_slave,
 	.ndo_fix_features        = br_fix_features,
+	.ndo_neigh_construct	 = netdev_default_l2upper_neigh_construct,
+	.ndo_neigh_destroy	 = netdev_default_l2upper_neigh_destroy,
 	.ndo_fdb_add		 = br_fdb_add,
 	.ndo_fdb_del		 = br_fdb_delete,
 	.ndo_fdb_dump		 = br_fdb_dump,

net/core/dev.c

@@ -6087,6 +6087,50 @@ void netdev_lower_state_changed(struct net_device *lower_dev,
 }
 EXPORT_SYMBOL(netdev_lower_state_changed);
 
+int netdev_default_l2upper_neigh_construct(struct net_device *dev,
+					   struct neighbour *n)
+{
+	struct net_device *lower_dev, *stop_dev;
+	struct list_head *iter;
+	int err;
+
+	netdev_for_each_lower_dev(dev, lower_dev, iter) {
+		if (!lower_dev->netdev_ops->ndo_neigh_construct)
+			continue;
+		err = lower_dev->netdev_ops->ndo_neigh_construct(lower_dev, n);
+		if (err) {
+			stop_dev = lower_dev;
+			goto rollback;
+		}
+	}
+	return 0;
+
+rollback:
+	netdev_for_each_lower_dev(dev, lower_dev, iter) {
+		if (lower_dev == stop_dev)
+			break;
+		if (!lower_dev->netdev_ops->ndo_neigh_destroy)
+			continue;
+		lower_dev->netdev_ops->ndo_neigh_destroy(lower_dev, n);
+	}
+	return err;
+}
+EXPORT_SYMBOL_GPL(netdev_default_l2upper_neigh_construct);
+
+void netdev_default_l2upper_neigh_destroy(struct net_device *dev,
+					  struct neighbour *n)
+{
+	struct net_device *lower_dev;
+	struct list_head *iter;
+
+	netdev_for_each_lower_dev(dev, lower_dev, iter) {
+		if (!lower_dev->netdev_ops->ndo_neigh_destroy)
+			continue;
+		lower_dev->netdev_ops->ndo_neigh_destroy(lower_dev, n);
+	}
+}
+EXPORT_SYMBOL_GPL(netdev_default_l2upper_neigh_destroy);
+
 static void dev_change_rx_flags(struct net_device *dev, int flags)
 {
 	const struct net_device_ops *ops = dev->netdev_ops;