[TCP]: Congestion control API update.

Do some simple changes to make congestion control API faster/cleaner.
* use ktime_t rather than timeval
* merge rtt sampling into existing ack callback
  this means one indirect call versus two per ack.
* use flags bits to store options/settings

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

1 files changed, 7 insertions, 3 deletions

diff --git a/net/ipv4/tcp_vegas.c b/net/ipv4/tcp_vegas.c
index 87e72bef6d08..f4104eeb5f26 100644
--- a/net/ipv4/tcp_vegas.c
+++ b/net/ipv4/tcp_vegas.c
@@ -120,10 +120,13 @@ static void tcp_vegas_init(struct sock *sk)
  *   o min-filter RTT samples from a much longer window (forever for now)
  *     to find the propagation delay (baseRTT)
  */
-static void tcp_vegas_rtt_calc(struct sock *sk, u32 usrtt)
+static void tcp_vegas_pkts_acked(struct sock *sk, u32 cnt, ktime_t last)
 {
         struct vegas *vegas = inet_csk_ca(sk);
-        u32 vrtt = usrtt + 1; /* Never allow zero rtt or baseRTT */
+        u32 vrtt;
+
+        /* Never allow zero rtt or baseRTT */
+        vrtt = (ktime_to_ns(net_timedelta(last)) / NSEC_PER_USEC) + 1;
 
         /* Filter to find propagation delay: */
         if (vrtt < vegas->baseRTT)
@@ -353,11 +356,12 @@ static void tcp_vegas_get_info(struct sock *sk, u32 ext,
 }
 
 static struct tcp_congestion_ops tcp_vegas = {
+        .flags          = TCP_CONG_RTT_STAMP,
         .init           = tcp_vegas_init,
         .ssthresh       = tcp_reno_ssthresh,
         .cong_avoid     = tcp_vegas_cong_avoid,
         .min_cwnd       = tcp_reno_min_cwnd,
-        .rtt_sample     = tcp_vegas_rtt_calc,
+        .pkts_acked     = tcp_vegas_pkts_acked,
         .set_state      = tcp_vegas_state,
         .cwnd_event     = tcp_vegas_cwnd_event,
         .get_info       = tcp_vegas_get_info,