此处主要记录OpenvSwitch 功能实现的调用过程：bash
注册用户态接收包时回调函数：
construct
|
|
open_dpif_backer
/ \
(dpif-netdev) / \(dpif-net-link)
/ \
udpif_create udpif_set_threads
| |
dpif_register_upcall_cb udpif_start_threads
| |
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
| |
flow_extract dpif_netlink_recv
|
process_upcall
|
upcall_xlate
|
xlate_actions
处理controller发送的packetout数据包：
ofconn_run
|
handle_openflow
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handle_packet_out
/ \
(2) / \(1)
/ \
ofproto_packet_out_finish ofproto_packet_out_start
| |
packet_execute packet_xlate
| |
dpif_execute xlate_actions
| |
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
|
netdev_port_receive
|
ovs_vport_receive
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ovs_dp_process_packet
/ \
(Normal Match)/ \ (Non-normal Match)
/ \
ovs_execute_actions ovs_dp_upcall
|
queue_userspace_packet
|
genlmsg_unicast
用户态Datapath处理packet流程：
pmd_thread_main dpif_netdev_run
\ /
\ /
dp_netdev_process_rxq_port
|
dp_netdev_input
|
fast_path_processing
|
handle_packet_upcall
/ \
(2) / \(1)
/ \
dp_netdev_execute_actions dp_netdev_upcall
| |
odp_execute_actions upcall_cb(调用注册的回调函数)
|
dp_execute_cb
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netdev_send