@@ -5773,6 +5773,17 @@ int mlxsw_sp_netdevice_router_port_event(struct net_device *dev)
if (err)
goto err_rif_fdb_op;
+ if (rif->mtu != dev->mtu) {
+ struct mlxsw_sp_vr *vr;
+
+ /* The RIF is relevant only to its mr_table instance, as unlike
+ * unicast routing, in multicast routing a RIF cannot be shared
+ * between several multicast routing tables.
+ */
+ vr = &mlxsw_sp->router->vrs[rif->vr_id];
+ mlxsw_sp_mr_rif_mtu_update(vr->mr4_table, rif, dev->mtu);
+ }
+
ether_addr_copy(rif->addr, dev->dev_addr);
rif->mtu = dev->mtu;