此处主要记录OpenvSwitch 功能实现的调用过程：
注册用户态接收包时回调函数：
construct
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open_dpif_backer
/
(dpif-netdev) / (dpif-net-link)
/
udpif_create udpif_set_threads
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dpif_register_upcall_cb udpif_start_threads
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dpif_netdev_register_upcall_cb ovs_thread_create
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udpif_upcall_handler （* 接收到内核态的请求）
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recv_upcalls
/
(2) / (1)
/
upcall_receive dpif_recv
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flow_extract dpif_netlink_recv
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process_upcall
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upcall_xlate
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xlate_actions
处理controller发送的packetout数据包：
ofconn_run
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handle_openflow
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handle_packet_out
/
(2) / (1)
/
ofproto_packet_out_finish ofproto_packet_out_start
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packet_execute packet_xlate
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dpif_execute xlate_actions
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dpif_operate rule_dpif_lookup_from_table
(dpif-netdev) / (dpif-netlink) |
/ rule_dpif_lookup_in_table
dpif_netdev_operate dpif_netlink_operate /
| | (2) / (1)
dpif_netdev_execute dpif_netlink_encode_execute /
| | do_xlate_actions classifier_lookup
dp_netdev_execute_actions nl_msg_put_genlmsghdr | |
| xlate_output_action find_match_wc
odp_execute_actions |
| compose_output_action
dp_execute_cb |
| nl_msg_put_odp_port
netdev_send
内核态Datapath处理packet流程：
netdev_frame_hook
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netdev_port_receive
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ovs_vport_receive
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ovs_dp_process_packet
/
(Normal Match)/ (Non-normal Match)
/
ovs_execute_actions ovs_dp_upcall
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queue_userspace_packet
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genlmsg_unicast
用户态Datapath处理packet流程：
pmd_thread_main dpif_netdev_run
/
/
dp_netdev_process_rxq_port
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dp_netdev_input
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fast_path_processing
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handle_packet_upcall
/
(2) / (1)
/
dp_netdev_execute_actions dp_netdev_upcall
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odp_execute_actions upcall_cb(调用注册的回调函数)
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dp_execute_cb
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netdev_send