Re: [PATCH export v3 4/4] mptcp: fallback to TCP on MP_FAIL with a single subflow

On 8/12/26 7:46 AM, Chenguang Zhao wrote:
> @@ -901,6 +898,12 @@ void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq)
>  		subflow->send_mp_fail = 1;
>  		subflow->send_infinite_map = 1;
>  		tcp_send_ack(sk);

Slightly unrelated... AFAICS the current code sends the mp_fail reply
immediatally, and will send the infinite mapping with the later data
send, if any.

I *think* it will be better to send MP_FAIL and infinite mapping
together. It should remove a little bit of complexity on the xmit path
and will be IMHO closer to the RFC specs.

/P