[TCP]: H-TCP maxRTT estimation at startup

Small patch to H-TCP from Douglas Leith.

Fix estimation of maxRTT.  The original code ignores rtt measurements
during slow start (via the check tp->snd_ssthresh < 0xFFFF) yet this
is probably a good time to try to estimate max rtt as delayed acking
is disabled and slow start will only exit on a loss which presumably
corresponds to a maxrtt measurement.  Second, the original code (via
the check htcp_ccount(ca) > 3) ignores rtt data during what it
estimates to be the first 3 round-trip times.  This seems like an
unnecessary check now that the RCV timestamp are no longer used
for rtt estimation.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp_htcp.c b/net/ipv4/tcp_htcp.c
index b66556c..5215691 100644 (file)
--- a/net/ipv4/tcp_htcp.c
+++ b/net/ipv4/tcp_htcp.c
@@ -79,7 +79,6 @@ static u32 htcp_cwnd_undo(struct sock *sk)
 static inline void measure_rtt(struct sock *sk, u32 srtt)
 {
        const struct inet_connection_sock *icsk = inet_csk(sk);
-       const struct tcp_sock *tp = tcp_sk(sk);
        struct htcp *ca = inet_csk_ca(sk);
 
        /* keep track of minimum RTT seen so far, minRTT is zero at first */
@@ -87,8 +86,7 @@ static inline void measure_rtt(struct sock *sk, u32 srtt)
                ca->minRTT = srtt;
 
        /* max RTT */
-       if (icsk->icsk_ca_state == TCP_CA_Open
-           && tp->snd_ssthresh < 0xFFFF && htcp_ccount(ca) > 3) {
+       if (icsk->icsk_ca_state == TCP_CA_Open) {
                if (ca->maxRTT < ca->minRTT)
                        ca->maxRTT = ca->minRTT;
                if (ca->maxRTT < srtt