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Date:   Mon, 03 Aug 2020 17:57:56 -0700
From:   John Fastabend <>
To:     Martin KaFai Lau <>,
Cc:     Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Eric Dumazet <>,,
        Lawrence Brakmo <>,
        Neal Cardwell <>,,
        Yuchung Cheng <>
Subject: RE: [RFC PATCH v4 bpf-next 02/12] tcp: bpf: Add TCP_BPF_DELACK_MAX

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) which will be introduced
> in the next patch.
> Another later selftest patch will also use it like the above to show
> how to write and parse bpf tcp header option.
> Reviewed-by: Eric Dumazet <>
> Signed-off-by: Martin KaFai Lau <>
> ---

Acked-by: John Fastabend <>

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