Re: [PATCH v9 net-next 10/15] tcp: accecn: unset ECT if receive or send ACE=0 in AccECN negotiaion

On Tue, Jan 20, 2026 at 7:11 PM Chia-Yu Chang (Nokia)
[off-list ref] wrote:

Hi Eric,

Thanks for the feedback.
Do you mean sk_listener here is read-only despite there is no const here?

It is not const because we probably need to increment reference counts on it.

But if you have 1000 SYN_RECV, they might share the same listener
socket, and we do not lock the listener socket,
this would not scale very well on servers with 10,000,000 tcp sockets :)

So using any listener-fields to store 'per-syn-recv' information is racy.

Then, could you help to suggest the way please?
Beacuse for AccECN, here we need to set fail flag after retransmitting SYN/ACK > 1 time.

Why not use state in req itself ? (Or tcp_rsk())

And this was done within tcp_make_synack(), but now move to every place where could retransmit SYN/ACK.

Thanks.
Chia-Yu