netdev - Re: [PATCH v10 net-next 11/15] tcp: accecn: fallback outgoing half link to non-AccECN

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Message-ID: <CANn89iJ7O5+xjoHHy1RZzLMfTBke7nmh+YhHCJsdpyx=-ewbOw@mail.gmail.com>
Date: Wed, 21 Jan 2026 15:46:05 +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, 
	corbet@....net, horms@...nel.org, dsahern@...nel.org, kuniyu@...gle.com, 
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	Jason_Livingood@...cast.com, vidhi_goel@...le.com
Subject: Re: [PATCH v10 net-next 11/15] tcp: accecn: fallback outgoing half
 link to non-AccECN

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>
>
> According to Section 3.2.2.1 of AccECN spec (RFC9768), if the Server
> is in AccECN mode and in SYN-RCVD state, and if it receives a value of
> zero on a pure ACK with SYN=0 and no SACK blocks, for the rest of the
> connection the Server MUST NOT set ECT on outgoing packets and MUST
> NOT respond to AccECN feedback. Nonetheless, as a Data Receiver it
> MUST NOT disable AccECN feedback.
>
> 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>