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tcp: should use number of sack blocks instead of -1

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While looking for the recent "sack issue" I also read all eff_sacks
usage that was played around by some relevant commit. I found
out that there's another thing that is asking for a fix (unrelated
to the "sack issue" though).

This feature has probably very little significance in practice.
Opposite direction timeout with bidirectional tcp comes to me as
the most likely scenario though there might be other cases as
well related to non-data segments we send (e.g., response to the
opposite direction segment). Also some ACK losses or option space
wasted for other purposes is necessary to prevent the earlier
SACK feedback getting to the sender.

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 2008-10-21 16:28:36 -07:00 committed by David S. Miller
parent 2515ddc6db
commit 75e3d8db53
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/tcp_output.c
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@ -432,7 +432,7 @@ static void tcp_options_write(__be32 *ptr, struct tcp_sock *tp,
if (tp->rx_opt.dsack) {
tp->rx_opt.dsack = 0;
tp->rx_opt.eff_sacks--;
tp->rx_opt.eff_sacks = tp->rx_opt.num_sacks;
}
}
}