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Date:   Mon, 24 Aug 2020 14:43:18 -0700
From:   Alexei Starovoitov <>
To:     Martin KaFai Lau <>
Cc:     bpf <>, Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Eric Dumazet <>,
        Kernel Team <>,
        Lawrence Brakmo <>,
        Neal Cardwell <>,
        Network Development <>,
        Yuchung Cheng <>
Subject: Re: [PATCH v5 bpf-next 00/12] BPF TCP header options

On Thu, Aug 20, 2020 at 12:00 PM Martin KaFai Lau <> wrote:
> The earlier effort in BPF-TCP-CC allows the TCP Congestion Control
> algorithm to be written in BPF.  It opens up opportunities to allow
> a faster turnaround time in testing/releasing new congestion control
> ideas to production environment.
> The same flexibility can be extended to writing TCP header option.
> It is not uncommon that people want to test new TCP header option
> to improve the TCP performance.  Another use case is for data-center
> that has a more controlled environment and has more flexibility in
> putting header options for internal traffic only.
> This patch set introduces the necessary BPF logic and API to
> allow bpf program to write and parse header options.
> There are also some changes to TCP and they are mostly to provide
> the needed sk and skb info to the bpf program to make decision.
> Patch 9 is the main patch and has more details on the API and design.
> The set includes an example which sends the max delay ack in
> the BPF TCP header option and the receiving side can
> then adjust its RTO accordingly.
> v5:
> - Move some of the comments from git commit message to the UAPI bpf.h
>   in patch 9
> - Some variable clean up in the tests (patch 11).

Applied. Thanks!

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