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multipath-tcp / mptcp_net-next

Development version of the Upstream MultiPath TCP Linux kernel 🐧
https://mptcp.dev
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[gs]etsockopt per subflow: BPF #76

Closed matttbe closed 5 months ago

matttbe commented 4 years ago

@nrybowski is working on it

A short documentation (in the wiki) could be useful!

matttbe commented 3 years ago

Unassigning myself (in fact more Nicolas) just in case someone else wants to look at it. Nobody here is actively looking at that one for the moment.

geliangtang commented 6 months ago

@matttbe Matt, please give me more details about this issue. I'll try to implement it. Thanks.

matttbe commented 6 months ago

@geliangtang I think being able to set/get socket options per subflow from BPF is already possible. What is missing is the documentation and maybe a test.

Back then, Nicolas added a test that was adding a different mark (SO_MARK) on each subflow, and changing the TCP CC only on the first subflow: https://github.com/multipath-tcp/mptcp_net-next/blob/scripts/bpf/examples/mptcp_set_sf_sockopt_kern.c I don't know if Nicolas' test is still OK, as his kernel code had to be adapted.

I think it would be good to have such test in the kernel, so it can be used as an example (and maybe linked to a doc), and be useful to track regressions.