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Date:   Sat, 27 Jun 2020 10:30:11 -0700
From:   Eric Dumazet <>
To:     Martin KaFai Lau <>
Cc:     bpf <>, Alexei Starovoitov <>,
        Daniel Borkmann <>,
        kernel-team <>,
        Lawrence Brakmo <>,
        Neal Cardwell <>,
        netdev <>,
        Yuchung Cheng <>
Subject: Re: [PATCH bpf-next 09/10] tcp: bpf: Add TCP_BPF_DELACK_MAX and
 TCP_BPF_RTO_MIN to bpf_setsockopt

On Fri, Jun 26, 2020 at 10:56 AM Martin KaFai Lau <> wrote:
> This change is mostly from an internal patch and adapts it from sysctl
> config to the bpf_setsockopt setup.
> The bpf_prog can set the max delay ack by using
> bpf_setsockopt(TCP_BPF_DELACK_MAX).  This max delay ack can be communicated
> to its peer through bpf header option.  The receiving peer can then use
> this max delay ack and set a potentially lower rto by using
> bpf_setsockopt(TCP_BPF_RTO_MIN).  A latter patch will use it
> like this in a test as an example.
> Signed-off-by: Martin KaFai Lau <>
> ---

Reviewed-by: Eric Dumazet <>

This could be split in two patches, but no big deal.

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