diff options
| author | Yuchung Cheng <ycheng@google.com> | 2017-01-13 09:11:31 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-01-14 06:37:16 +0300 |
| commit | e636f8b0104d6622aaaed6aa5ef17dfbf165bc51 (patch) | |
| tree | df39c0f942ddcab2869d408414f562ae208ddea9 /net/ipv4/tcp_input.c | |
| parent | db8da6bb574e1692cb86624317c572b0b9306560 (diff) | |
| download | linux-e636f8b0104d6622aaaed6aa5ef17dfbf165bc51.tar.xz | |
tcp: new helper for RACK to detect loss
Create a new helper tcp_rack_detect_loss to prepare the upcoming
RACK reordering timer patch.
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_input.c')
| -rw-r--r-- | net/ipv4/tcp_input.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index ec6d84363024..bb24b93e64bc 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -2865,10 +2865,14 @@ static void tcp_fastretrans_alert(struct sock *sk, const int acked, } /* Use RACK to detect loss */ - if (sysctl_tcp_recovery & TCP_RACK_LOST_RETRANS && - tcp_rack_mark_lost(sk)) { - flag |= FLAG_LOST_RETRANS; - *ack_flag |= FLAG_LOST_RETRANS; + if (sysctl_tcp_recovery & TCP_RACK_LOST_RETRANS) { + u32 prior_retrans = tp->retrans_out; + + tcp_rack_mark_lost(sk); + if (prior_retrans > tp->retrans_out) { + flag |= FLAG_LOST_RETRANS; + *ack_flag |= FLAG_LOST_RETRANS; + } } /* E. Process state. */ |