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[TCP]: Extend reordering detection to cover CA_Loss partially

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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 <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen 2007-11-15 19:35:11 -08:00 committed by David S. Miller
parent b9d86585dc
commit f577111302
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/tcp_input.c
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@ -1511,7 +1511,8 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
tcp_verify_left_out(tp);
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);