mlxsw: spectrum_nve: Add mlxsw_sp_nve_ops.fdb_clear_offload

If there are any offloaded FDB entries at an NVE device at the time that
it's un-offloaded, their offloaded marks need to be cleared. How that is
done depends on NVE device type, and therefore add a per-NVE-type
operation.

Implement the operation for the sole NVE device type currently supported
by mlxsw, VXLAN.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_nve.h

@@ -42,6 +42,7 @@ struct mlxsw_sp_nve_ops {
 		    const struct mlxsw_sp_nve_config *config);
 	void (*fini)(struct mlxsw_sp_nve *nve);
 	int (*fdb_replay)(const struct net_device *nve_dev, __be32 vni);
+	void (*fdb_clear_offload)(const struct net_device *nve_dev, __be32 vni);
 };
 
 extern const struct mlxsw_sp_nve_ops mlxsw_sp1_nve_vxlan_ops;

drivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c

@@ -219,6 +219,14 @@ mlxsw_sp_nve_vxlan_fdb_replay(const struct net_device *nve_dev, __be32 vni)
 	return vxlan_fdb_replay(nve_dev, vni, &mlxsw_sp_switchdev_notifier);
 }
 
+static void
+mlxsw_sp_nve_vxlan_clear_offload(const struct net_device *nve_dev, __be32 vni)
+{
+	if (WARN_ON(!netif_is_vxlan(nve_dev)))
+		return;
+	vxlan_fdb_clear_offload(nve_dev, vni);
+}
+
 const struct mlxsw_sp_nve_ops mlxsw_sp1_nve_vxlan_ops = {
 	.type		= MLXSW_SP_NVE_TYPE_VXLAN,
 	.can_offload	= mlxsw_sp1_nve_vxlan_can_offload,
@@ -226,6 +234,7 @@ const struct mlxsw_sp_nve_ops mlxsw_sp1_nve_vxlan_ops = {
 	.init		= mlxsw_sp1_nve_vxlan_init,
 	.fini		= mlxsw_sp1_nve_vxlan_fini,
 	.fdb_replay	= mlxsw_sp_nve_vxlan_fdb_replay,
+	.fdb_clear_offload = mlxsw_sp_nve_vxlan_clear_offload,
 };
 
 static bool mlxsw_sp2_nve_vxlan_can_offload(const struct mlxsw_sp_nve *nve,
@@ -252,4 +261,5 @@ const struct mlxsw_sp_nve_ops mlxsw_sp2_nve_vxlan_ops = {
 	.init		= mlxsw_sp2_nve_vxlan_init,
 	.fini		= mlxsw_sp2_nve_vxlan_fini,
 	.fdb_replay	= mlxsw_sp_nve_vxlan_fdb_replay,
+	.fdb_clear_offload = mlxsw_sp_nve_vxlan_clear_offload,
 };