6 Nov
2025
6 Nov
'25
11:42 a.m.
On 10/30/25 3:34 PM, chia-yu.chang@nokia-bell-labs.com wrote:
From: Chia-Yu Chang chia-yu.chang@nokia-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@nokia-bell-labs.com
Acked-by: Paolo Abeni pabeni@redhat.com