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Since the post_socket_cb() callback is added in struct network_helper_opts, it's make sense to use it not only in __start_server(), but also in connect_to_fd_opts(). Then it can be used to set TCP_CONGESTION sockopt. Add a "void *" type member cb_opts into struct network_helper_opts, and add a new struct named cb_opts in prog_tests/bpf_tcp_ca.c, then cc can be moved into struct cb_opts from network_helper_opts. Define a new callback cc_cb() to set TCP_CONGESTION sockopt, and set it to post_socket_cb pointer of opts. Define a new cb_opts cubic, set it to cb_opts of opts. Pass this opts to connect_to_fd_opts() in test_dctcp_fallback(). Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn> Link: https://lore.kernel.org/r/b512bb8d8f6854c9ea5c409b69d1bf37c6f272c6.1716638248.git.tanggeliang@kylinos.cn Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>