Re: [PATCH net-next] tcp: tracking packets with CE marks in BW rate sample

On Thu, 23 Sep 2021 21:17:07 +0000 Luke Hsiao wrote:

From: Yuchung Cheng <redacted>

In order to track CE marks per rate sample (one round trip), TCP needs a
per-skb header field to record the tp->delivered_ce count when the skb
was sent. To make space, we replace the "last_in_flight" field which is
used exclusively for NV congestion control. The stat needed by NV can be
alternatively approximated by existing stats tcp_sock delivered and
mss_cache.

This patch counts the number of packets delivered which have CE marks in
the rate sample, using similar approach of delivery accounting.

Is this expected to be used from BPF CC? I don't see a user..