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 [off-list ref] wrote:

From: Chia-Yu Chang <redacted>

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

Reviewed-by: Eric Dumazet <edumazet@google.com>