On Fri, Jun 26, 2020 at 10:56 AM Martin KaFai Lau [off-list ref] 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 <redacted>
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Reviewed-by: Eric Dumazet <edumazet@google.com>

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