Commit:     f577111302677e6d1448475821cc19ba8835f60e
Parent:     b9d86585dc6c9265aa373c7036458fe8aa7627c6
Author:     Ilpo Järvinen <[EMAIL PROTECTED]>
AuthorDate: Thu Nov 15 19:35:11 2007 -0800
Committer:  David S. Miller <[EMAIL PROTECTED]>
CommitDate: Mon Jan 28 14:54:02 2008 -0800

    [TCP]: Extend reordering detection to cover CA_Loss partially
    This implements more accurately what is stated in sacktag's
    overall comment:
      "Both of these heuristics are not used in Loss state, when
       we cannot account for retransmits accurately."
    When CA_Loss state is entered, the state changer ensures that
    undo_marker is only set if no TCPCB_RETRANS skbs were found,
    thus having non-zero undo_marker in CA_Loss basically tells
    that the R-bits still accurately reflect the current state
    of TCP.
    Signed-off-by: Ilpo Järvinen <[EMAIL PROTECTED]>
    Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
 net/ipv4/tcp_input.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 901240f..26713e5 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1511,7 +1511,8 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff 
*ack_skb, u32 prior_snd_
-       if ((reord < tp->fackets_out) && icsk->icsk_ca_state != TCP_CA_Loss &&
+       if ((reord < tp->fackets_out) &&
+           ((icsk->icsk_ca_state != TCP_CA_Loss) || tp->undo_marker) &&
            (!tp->frto_highmark || after(tp->snd_una, tp->frto_highmark)))
                tcp_update_reordering(sk, tp->fackets_out - reord, 0);
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