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Commit d254bcdb authored by Ilpo Järvinen's avatar Ilpo Järvinen Committed by David S. Miller
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[TCP]: Fixes IW > 2 cases when TCP is application limited 



Whenever a transfer is application limited, we are allowed at least
initial window worth of data per window unless cwnd is previously
less than that.

Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c4c0ce5c

net/ipv4/tcp_input.c

+2 −1
Original line number Original line Diff line number Diff line
@@ -3541,7 +3541,8 @@ void tcp_cwnd_application_limited(struct sock *sk) 
	if (inet_csk(sk)->icsk_ca_state == TCP_CA_Open &&

	if (inet_csk(sk)->icsk_ca_state == TCP_CA_Open &&

	    sk->sk_socket && !test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {

	    sk->sk_socket && !test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {

		/* Limited by application or receiver window. */

		/* Limited by application or receiver window. */

		u32 win_used = max(tp->snd_cwnd_used, 2U);

		u32 init_win = tcp_init_cwnd(tp, __sk_dst_get(sk));

		u32 win_used = max(tp->snd_cwnd_used, init_win);

		if (win_used < tp->snd_cwnd) {

		if (win_used < tp->snd_cwnd) {

			tp->snd_ssthresh = tcp_current_ssthresh(sk);

			tp->snd_ssthresh = tcp_current_ssthresh(sk);

			tp->snd_cwnd = (tp->snd_cwnd + win_used) >> 1;

			tp->snd_cwnd = (tp->snd_cwnd + win_used) >> 1;