netdev - bpf: add BPF_CGROUP_SOCK_OPS callback that is executed on every RTT (commit: 23729ff23186424)

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Message-ID: <2628656e-ea6f-4885-8fbc-bd14f07a5b00@oracle.com>
Date: Thu, 25 Jul 2024 12:37:03 -0700
From: Rao Shoaib <rao.shoaib@...cle.com>
To: sdf@...gle.com, Eric Dumazet <edumazet@...gle.com>, priyarjha@...gle.com,
        ycheng@...gle.com, soheil@...gle.com, daniel@...earbox.net
Cc: netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: bpf: add BPF_CGROUP_SOCK_OPS callback that is executed on every RTT
 (commit: 23729ff23186424)

Hi Stanislav,

I have a question about the placement of tcp_bpf_rtt() call in
tcp_rtt_estimator(). Why is the call made before the assignment

tp->srtt_us = max(1U, srtt);

How is the attached eBPF program suppose the get the new value?

Thanks,

Shoaib