netdev - Re: [PATCH v17 net-next 13/14] tcp: accecn: AccECN option ceb/cep and ACE field multi-wrap heuristics

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Message-ID: <CANn89iKaM5HbOT2wU_qSaSxzyLRfRKz6Y3+AXq9ZmQhWjftMWQ@mail.gmail.com>
Date: Thu, 11 Sep 2025 03:37:20 -0700
From: Eric Dumazet <edumazet@...gle.com>
To: chia-yu.chang@...ia-bell-labs.com
Cc: pabeni@...hat.com, linux-doc@...r.kernel.org, corbet@....net, 
	horms@...nel.org, dsahern@...nel.org, kuniyu@...zon.com, bpf@...r.kernel.org, 
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Subject: Re: [PATCH v17 net-next 13/14] tcp: accecn: AccECN option ceb/cep and
 ACE field multi-wrap heuristics

On Mon, Sep 8, 2025 at 10:34 AM <chia-yu.chang@...ia-bell-labs.com> wrote:
>
> From: Ilpo Järvinen <ij@...nel.org>
>
> The AccECN option ceb/cep heuristic algorithm is from AccECN spec
> Appendix A.2.2 to mitigate against false ACE field overflows. Armed
> with ceb delta from option, delivered bytes, and delivered packets it
> is possible to estimate how many times ACE field wrapped.
>
> This calculation is necessary only if more than one wrap is possible.
> Without SACK, delivered bytes and packets are not always trustworthy in
> which case TCP falls back to the simpler no-or-all wraps ceb algorithm.
>
> Signed-off-by: Ilpo Järvinen <ij@...nel.org>
> Signed-off-by: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>
> Acked-by: Paolo Abeni <pabeni@...hat.com>

Reviewed-by: Eric Dumazet <edumazet@...gle.com>