1.Datapath module
1.初始化vPort，Flow cache，netlink operation (dp_datapath_genl_family，dp_vport_genl_family，dp_flow_genl_family，dp_packet_genl_family) ， dp_init(Datapath.c) -> [ovs_internal_dev_rtnl_link_register，ovs_flow_init，ovs_vport_init，ovs_netdev_init， dp_register_genl]
2.datapath create vxlan port pipeline: ovs_vport_cmd_new(Datapath.c upon netlink) -> new_vport(Datapath.c) -> ovs_vport_add(vport.c) -> vxlan_create(vport-vxlan.c) -> ovs_netdev_link(Vport-netdev.c) -> netdev_rx_handler_register -> netdev_frame_hook(Vport-netdev.c)
2.Add_port
bridge_reconfigure(Bridge.c) -> bridge_add_ports(Bridge.c) -> bridge_add_ports__(Bridge.c) -> iface_create(Bridge.c) -> iface_do_create(Bridge.c) -> ofproto_port_add(Ofproto.c) -> port_add(Ofproto-dpif.c) -> dpif_port_add (Dpif.c) -> dpif_netlink_port_add(Dpif-netlink.c)
3.Add_flow
ofproto_run(Ofproto.c) -> handle_openflow(Ofproto.c) -> handle_flow_mod(Ofproto.c) -> handle_flow_mod__(Ofproto.c ofproto_flow_mod_start) -> ofproto_flow_mod_finish (Ofproto.c) -> add_flow_finish(Ofproto.c) -> run_rule_executes(Ofproto.c) -> rule_execute(Ofproto-dpif.c) -> rule_dpif_execute (Ofproto-dpif.c) -> ofproto_dpif_execute_actions(Ofproto-dpif.c) -> ofproto_dpif_execute_actions__(Ofproto-dpif.c) [xlate_actions(Ofproto-dpif-xlate.c) -> do_xlate_actions] -> dpif_execute(Dpif.c) -> dpif_operate(Dpif.c) -> dpif_netlink_operate(Dpif-netlink.c)
4.OpenVSwitch（配置IP可进三层路由）：
internal_dev_create(vport-internal_dev.c) -> internal_dev_receive(vport-internal_dev.c) ->netif_rx(dev.c)