提交 1cebce36 编写于 作者: Y Yuchung Cheng 提交者: David S. Miller

tcp: fix infinite cwnd in tcp_complete_cwr()

When the cwnd reduction is done, ssthresh may be infinite
if TCP enters CWR via ECN or F-RTO. If cwnd is not undone, i.e.,
undo_marker is set, tcp_complete_cwr() falsely set cwnd to the
infinite ssthresh value. The correct operation is to keep cwnd
intact because it has been updated in ECN or F-RTO.
Signed-off-by: NYuchung Cheng <ycheng@google.com>
Acked-by: NNeal Cardwell <ncardwell@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 05be1824
......@@ -2868,12 +2868,15 @@ static inline void tcp_complete_cwr(struct sock *sk)
/* Do not moderate cwnd if it's already undone in cwr or recovery. */
if (tp->undo_marker) {
if (inet_csk(sk)->icsk_ca_state == TCP_CA_CWR)
if (inet_csk(sk)->icsk_ca_state == TCP_CA_CWR) {
tp->snd_cwnd = min(tp->snd_cwnd, tp->snd_ssthresh);
else /* PRR */
tp->snd_cwnd_stamp = tcp_time_stamp;
} else if (tp->snd_ssthresh < TCP_INFINITE_SSTHRESH) {
/* PRR algorithm. */
tp->snd_cwnd = tp->snd_ssthresh;
tp->snd_cwnd_stamp = tcp_time_stamp;
}
}
tcp_ca_event(sk, CA_EVENT_COMPLETE_CWR);
}
......
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