netdev - Re: [PATCH v6 net-next 05/14] tcp: ECT_1_NEGOTIATION and NEEDS

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Message-ID: <715746f8-d1f0-485a-ab83-2f768722698f@redhat.com>
Date: Tue, 18 Nov 2025 13:30:17 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: chia-yu.chang@...ia-bell-labs.com, edumazet@...gle.com, parav@...dia.com,
 linux-doc@...r.kernel.org, corbet@....net, horms@...nel.org,
 dsahern@...nel.org, kuniyu@...gle.com, bpf@...r.kernel.org,
 netdev@...r.kernel.org, dave.taht@...il.com, jhs@...atatu.com,
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 donald.hunter@...il.com, ast@...erby.net, liuhangbin@...il.com,
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Cc: Olivier Tilmans <olivier.tilmans@...ia.com>
Subject: Re: [PATCH v6 net-next 05/14] tcp: ECT_1_NEGOTIATION and NEEDS_ACCECN
 identifiers

On 11/14/25 8:13 AM, chia-yu.chang@...ia-bell-labs.com wrote:
> From: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>
> 
> Two CA module flags are added in this patch related to AccECN negotiation.
> First, a new CA module flag (TCP_CONG_NEEDS_ACCECN) defines that the CA
> expects to negotiate AccECN functionality using the ECE, CWR and AE flags
> in the TCP header.
> 
> Second, during ECN negotiation, ECT(0) in the IP header is used. This patch
> enables CA to control whether ECT(0) or ECT(1) should be used on a per-segment
> basis. A new flag (TCP_CONG_ECT_1_NEGOTIATION) defines the expected ECT value
> in the IP header by the CA when not-yet initialized for the connection.
> 
> The detailed AccECN negotiaotn during the 3WHS can be found in the AccECN spec:
>   https://tools.ietf.org/id/draft-ietf-tcpm-accurate-ecn-28.txt
> 
> Co-developed-by: Olivier Tilmans <olivier.tilmans@...ia.com>
> Signed-off-by: Olivier Tilmans <olivier.tilmans@...ia.com>
> 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>