netdev - Re: [PATCH v5 net-next 08/14] tcp: accecn: retransmit downgraded SYN in AccECN negotiation

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Message-ID: <981dbc10-0833-418e-b389-93e0daee8acf@redhat.com>
Date: Thu, 6 Nov 2025 12:47:48 +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 08/14] tcp: accecn: retransmit downgraded SYN
 in AccECN negotiation

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>
> 
> Based on AccECN spec (RFC9768), if the sender of an AccECN SYN
> (the TCP Client) times out before receiving the SYN/ACK, it SHOULD
> attempt to negotiate the use of AccECN at least one more time by
> continuing to set all three TCP ECN flags (AE,CWR,ECE) = (1,1,1) on
> the first retransmitted SYN (using the usual retransmission time-outs).
> 
> If this first retransmission also fails to be acknowledged, in
> deployment scenarios where AccECN path traversal might be problematic,
> the TCP Client SHOULD send subsequent retransmissions of the SYN with
> the three TCP-ECN flags cleared (AE,CWR,ECE) = (0,0,0).
> 
> Signed-off-by: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>

Acked-by: Paolo Abeni <pabeni@...hat.com>