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authorIlpo Järvinen <ilpo.jarvinen@helsinki.fi>2007-06-16 02:08:43 +0400
committerDavid S. Miller <davem@davemloft.net>2007-06-16 02:08:43 +0400
commitb9ce204f0a265f819d10c943a607746abb62f245 (patch)
tree45078d076bcd952d8820c590653939b312d06ac2 /net/ipv4/tcp_vegas.c
parent22b1a9203ea634ac0ee5240e021613da3328275f (diff)
downloadlinux-b9ce204f0a265f819d10c943a607746abb62f245.tar.xz
[TCP]: Congestion control API RTT sampling fix
Commit 164891aadf1721fca4dce473bb0e0998181537c6 broke RTT sampling of congestion control modules. Inaccurate timestamps could be fed to them without providing any way for them to identify such cases. Previously RTT sampler was called only if FLAG_RETRANS_DATA_ACKED was not set filtering inaccurate timestamps nicely. In addition, the new behavior could give an invalid timestamp (zero) to RTT sampler if only skbs with TCPCB_RETRANS were ACKed. This solves both problems. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_vegas.c')
-rw-r--r--net/ipv4/tcp_vegas.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv4/tcp_vegas.c b/net/ipv4/tcp_vegas.c
index 73e19cf7df21..e218a51ceced 100644
--- a/net/ipv4/tcp_vegas.c
+++ b/net/ipv4/tcp_vegas.c
@@ -117,6 +117,9 @@ void tcp_vegas_pkts_acked(struct sock *sk, u32 cnt, ktime_t last)
struct vegas *vegas = inet_csk_ca(sk);
u32 vrtt;
+ if (ktime_equal(last, net_invalid_timestamp()))
+ return;
+
/* Never allow zero rtt or baseRTT */
vrtt = ktime_to_us(net_timedelta(last)) + 1;