Hi Martin, On 27/03/2024 23:16, Martin KaFai Lau wrote: (...) > Unrelated, is there a way to tell if a tcp_sock is a subflow? Yes, you can use "sk_is_mptcp(sk)". Please note that this 'sk' *has* to be a tcp_sock, this is not checked by the helper. That's what is used with bpf_mptcp_sock_from_subflow() https://elixir.bootlin.com/linux/latest/source/net/mptcp/bpf.c#L15 > bpf prog > can use it to decide if it wants to setsockopt on a subflow or not. I think it is important to keep the possibility to set socket options per subflow. If the original issue discussed here is limited to set_rcvlowat(), best to address it there. Cheers, Matt -- Sponsored by the NGI0 Core fund.
