netdev - Re: [PATCH v9 net-next 05/15] tcp: disable RFC3168 fallback identifier for CC modules

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Message-ID: <CANn89i+P_g8XB++mQ-MMXSSaTURLsohqnxHBcVpVrBBBoru91w@mail.gmail.com>
Date: Tue, 20 Jan 2026 10:56:39 +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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Subject: Re: [PATCH v9 net-next 05/15] tcp: disable RFC3168 fallback
 identifier for CC modules

On Mon, Jan 19, 2026 at 7:59 PM <chia-yu.chang@...ia-bell-labs.com> wrote:
>
> From: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>
>
> When AccECN is not successfully negociated for a TCP flow, it defaults
> fallback to classic ECN (RFC3168). However, L4S service will fallback
> to non-ECN.
>
> This patch enables congestion control module to control whether it
> should not fallback to classic ECN after unsuccessful AccECN negotiation.
> A new CA module flag (TCP_CONG_NO_FALLBACK_RFC3168) identifies this
> behavior expected by the CA.
>
> 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>