netdev - Re: [PATCH v10 net-next 10/15] tcp: accecn: unset ECT if receive or send ACE=0 in AccECN negotiaion

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Message-ID: <CANn89iJz1Au-kfk8Kp001vwvuxdndYX-Y++vB6NK5A_CBXVLHA@mail.gmail.com>
Date: Wed, 21 Jan 2026 15:44:46 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: chia-yu.chang@...ia-bell-labs.com
Cc: pabeni@...hat.com, parav@...dia.com, linux-doc@...r.kernel.org, 
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Subject: Re: [PATCH v10 net-next 10/15] tcp: accecn: unset ECT if receive or
 send ACE=0 in AccECN negotiaion

On Wed, Jan 21, 2026 at 3:32 PM <chia-yu.chang@...ia-bell-labs.com> wrote:
>
> From: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>
>
> Based on specification:
>   https://tools.ietf.org/id/draft-ietf-tcpm-accurate-ecn-28.txt
>
> Based on Section 3.1.5 of AccECN spec (RFC9768), a TCP Server in
> AccECN mode MUST NOT set ECT on any packet for the rest of the connection,
> if it has received or sent at least one valid SYN or Acceptable SYN/ACK
> with (AE,CWR,ECE) = (0,0,0) during the handshake.
>
> In addition, a host in AccECN mode that is feeding back the IP-ECN
> field on a SYN or SYN/ACK MUST feed back the IP-ECN field on the
> latest valid SYN or acceptable SYN/ACK to arrive.
>
> Signed-off-by: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>
>

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