Don't send RST on ACK TCP segments in listen socket RX path

During guided migration between xlio_poll_groups, between detach and
attach operations the new RX packets arrive to the respective listen
socket due to 3T steering. Drop such packets with TCP RST, so the
packets can be retransmitted eventually and the TCP stream recover.

Signed-off-by: Dmytro Podgornyi <[email protected]>

Author: pasis

src/core/lwip/tcp_in.c

@@ -313,8 +313,10 @@ static void tcp_listen_input(struct tcp_pcb *pcb, tcp_in_data *in_data)
     if (in_data->flags & TCP_ACK) {
         /* For incoming segments with the ACK flag set, respond with a RST. */
         LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_listen_input: ACK in LISTEN, sending reset\n"));
+#if 0
         tcp_rst(in_data->ackno + 1, in_data->seqno + in_data->tcplen, in_data->tcphdr->dest,
                 in_data->tcphdr->src, NULL);
+#endif
     } else if (in_data->flags & TCP_SYN) {
         LWIP_DEBUGF(TCP_DEBUG,
                     ("TCP connection request %" U16_F " -> %" U16_F ".\n", in_data->tcphdr->src,