不同Programs之间通信

用bpf_obj_get来获取MAP的描述符，然后用bpf_map_reuse_fd函数来在不同program之间复用

kernel 与 user space之间

需要pin the BPF MAP to the BPF Virtual File System (VFS),来持久化存储，否则如果map用不到会被destory

引用：B. Yang, D. Shen, J. Zhang, F. Dong, J. Luo and J. C. S. Lui, “Towards the Full Extensibility of Multipath TCP with eMPTCP,” 2022 IEEE 30th International Conference on Network Protocols (ICNP), Lexington, KY, USA, 2022, pp. 1-11, doi: 10.1109/ICNP55882.2022.9940354.第7页