netdev - Re: [PATCH v5 net-next 06/14] tcp: disable RFC3168 fallback identifier for CC modules

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Message-ID: <aeaa5b5f-8697-4431-82b1-c890d67ebd41@redhat.com>
Date: Thu, 6 Nov 2025 12:42:14 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: chia-yu.chang@...ia-bell-labs.com, edumazet@...gle.com, parav@...dia.com,
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Subject: Re: [PATCH v5 net-next 06/14] tcp: disable RFC3168 fallback
 identifier for CC modules

On 10/30/25 3:34 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>