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| author | Yuchung Cheng <[email protected]> | 2017-12-07 19:33:30 +0000 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2017-12-08 19:14:11 +0000 |
| commit | 0ce294d88457bccd7f9991f883fec80022a1ddbd (patch) | |
| tree | 9b4bb1c98c751b01b0f06fded0e3db0e403b5cfc | |
| parent | bnxt_en: Fix sources of spurious netpoll warnings (diff) | |
| download | kernel-0ce294d88457bccd7f9991f883fec80022a1ddbd.tar.gz kernel-0ce294d88457bccd7f9991f883fec80022a1ddbd.zip | |
tcp: correctly test congestion state in RACK
RACK does not test the loss recovery state correctly to compute
the reordering window. It assumes if lost_out is zero then TCP is
not in loss recovery. But it can be zero during recovery before
calling tcp_rack_detect_loss(): when an ACK acknowledges all
packets marked lost before receiving this ACK, but has not yet
to discover new ones by tcp_rack_detect_loss(). The fix is to
simply test the congestion state directly.
Signed-off-by: Yuchung Cheng <[email protected]>
Reviewed-by: Neal Cardwell <[email protected]>
Reviewed-by: Priyaranjan Jha <[email protected]>
Reviewed-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
| -rw-r--r-- | net/ipv4/tcp_recovery.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/tcp_recovery.c b/net/ipv4/tcp_recovery.c index d3ea89020c69..3143664902e9 100644 --- a/net/ipv4/tcp_recovery.c +++ b/net/ipv4/tcp_recovery.c @@ -55,7 +55,8 @@ static void tcp_rack_detect_loss(struct sock *sk, u32 *reo_timeout) * to queuing or delayed ACKs. */ reo_wnd = 1000; - if ((tp->rack.reord || !tp->lost_out) && min_rtt != ~0U) { + if ((tp->rack.reord || inet_csk(sk)->icsk_ca_state < TCP_CA_Recovery) && + min_rtt != ~0U) { reo_wnd = max((min_rtt >> 2) * tp->rack.reo_wnd_steps, reo_wnd); reo_wnd = min(reo_wnd, tp->srtt_us >> 3); } |