X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=net%2Fipv4%2Ftcp_illinois.c;h=1eba160b72dc452b70ddbbfaa374de51ce938f0d;hb=63a16f90167850010864a9e8ebb71d216983090f;hp=cc5de6f69d46f0e2f4fd81e8c4815780ba609bb4;hpb=d796e641a3eea2109381d6b0af533454f44916fa;p=linux-2.6

diff --git a/net/ipv4/tcp_illinois.c b/net/ipv4/tcp_illinois.c
index cc5de6f69d..1eba160b72 100644
--- a/net/ipv4/tcp_illinois.c
+++ b/net/ipv4/tcp_illinois.c
@@ -83,18 +83,16 @@ static void tcp_illinois_init(struct sock *sk)
 }
 
 /* Measure RTT for each ack. */
-static void tcp_illinois_acked(struct sock *sk, u32 pkts_acked, ktime_t last)
+static void tcp_illinois_acked(struct sock *sk, u32 pkts_acked, s32 rtt)
 {
 	struct illinois *ca = inet_csk_ca(sk);
-	u32 rtt;
 
 	ca->acked = pkts_acked;
 
-	if (ktime_equal(last, net_invalid_timestamp()))
+	/* dup ack, no rtt sample */
+	if (rtt < 0)
 		return;
 
-	rtt = ktime_to_us(net_timedelta(last));
-
 	/* ignore bogus values, this prevents wraparound in alpha math */
 	if (rtt > RTT_MAX)
 		rtt = RTT_MAX;
@@ -258,8 +256,7 @@ static void tcp_illinois_state(struct sock *sk, u8 new_state)
 /*
  * Increase window in response to successful acknowledgment.
  */
-static void tcp_illinois_cong_avoid(struct sock *sk, u32 ack,
-				    u32 in_flight, int flag)
+static void tcp_illinois_cong_avoid(struct sock *sk, u32 ack, u32 in_flight)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct illinois *ca = inet_csk_ca(sk);
@@ -300,7 +297,7 @@ static u32 tcp_illinois_ssthresh(struct sock *sk)
 	struct illinois *ca = inet_csk_ca(sk);
 
 	/* Multiplicative decrease */
-	return max((tp->snd_cwnd * ca->beta) >> BETA_SHIFT, 2U);
+	return max(tp->snd_cwnd - ((tp->snd_cwnd * ca->beta) >> BETA_SHIFT), 2U);
 }