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tcp: undo on DSACK during recovery 

If the receiver supports DSACK, sender can detect false recoveries and
revert cwnd reductions triggered by either severe network reordering or
concurrent reordering and loss event.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Yuchung Cheng 2013-05-29 14:20:14 +00:00 committed by David S. Miller
parent 7026b912f9
commit c7d9d6a185
1 changed files with 7 additions and 1 deletions
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8
net/ipv4/tcp_input.c
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@ -2315,7 +2315,7 @@ static bool tcp_try_undo_recovery(struct sock *sk)
}
/* Try to undo cwnd reduction, because D-SACKs acked all retransmitted data */
static void tcp_try_undo_dsack(struct sock *sk)
static bool tcp_try_undo_dsack(struct sock *sk)
{
struct tcp_sock *tp = tcp_sk(sk);
@ -2323,7 +2323,9 @@ static void tcp_try_undo_dsack(struct sock *sk)
DBGUNDO(sk, "D-SACK");
tcp_undo_cwnd_reduction(sk, false);
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPDSACKUNDO);
return true;
}
return false;
}
/* We can clear retrans_stamp when there are no retransmissions in the
@ -2751,6 +2753,10 @@ static void tcp_fastretrans_alert(struct sock *sk, const int acked,
do_lost = tcp_is_reno(tp) ||
tcp_fackets_out(tp) > tp->reordering;
}
if (tcp_try_undo_dsack(sk)) {
tcp_try_keep_open(sk);
return;
}
break;
case TCP_CA_Loss:
tcp_process_loss(sk, flag, is_dupack);