[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: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -3541,7 +3541,8 @@ void tcp_cwnd_application_limited(struct sock *sk)
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if (inet_csk(sk)->icsk_ca_state == TCP_CA_Open &&
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sk->sk_socket && !test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
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/* Limited by application or receiver window. */
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u32 win_used = max(tp->snd_cwnd_used, 2U);
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u32 init_win = tcp_init_cwnd(tp, __sk_dst_get(sk));
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u32 win_used = max(tp->snd_cwnd_used, init_win);
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if (win_used < tp->snd_cwnd) {
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tp->snd_ssthresh = tcp_current_ssthresh(sk);
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tp->snd_cwnd = (tp->snd_cwnd + win_used) >> 1;
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