netdev - Force ACK each received tcp segment under no condition

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Date:	Fri, 24 Jan 2014 15:18:19 -0800
From:	Vincent Li <vincent.mc.li@...il.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Force ACK each received tcp segment under no condition

Hi

I know this sounds really silly, but I would like to do such test to
meet my curiosity. is that all I need to do?

static void __tcp_ack_snd_check(struct sock *sk, int ofo_possible)
{
        struct tcp_sock *tp = tcp_sk(sk);

            /* More than one full frame received... */
        if (((tp->rcv_nxt - tp->rcv_wup) > inet_csk(sk)->icsk_ack.rcv_mss
             /* ... and right edge of window advances far enough.
              * (tcp_recvmsg() will send ACK otherwise). Or...
              */
             && __tcp_select_window(sk) >= tp->rcv_wnd) ||
            /* We ACK each frame or... */
            tcp_in_quickack_mode(sk) ||
            /* We have out of order data. */
            (ofo_possible && skb_peek(&tp->out_of_order_queue))) {
                /* Then ack it now */
                tcp_send_ack(sk);
        } else {
                /* Else, send delayed ack. */
                //tcp_send_delayed_ack(sk);
                 tcp_send_ack(sk);

        }
}
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