From 756ee1729b2feb3a45767da29e338f70f2086ba3 Mon Sep 17 00:00:00 2001
From: Lawrence Brakmo <brakmo@fb.com>
Date: Wed, 11 May 2016 10:02:13 -0700
Subject: tcp: replace cnt & rtt with struct in pkts_acked()

Replace 2 arguments (cnt and rtt) in the congestion control modules'
pkts_acked() function with a struct. This will allow adding more
information without having to modify existing congestion control
modules (tcp_nv in particular needs bytes in flight when packet
was sent).

As proposed by Neal Cardwell in his comments to the tcp_nv patch.

Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/ipv4/tcp_cdg.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

(limited to 'net/ipv4/tcp_cdg.c')

diff --git a/net/ipv4/tcp_cdg.c b/net/ipv4/tcp_cdg.c
index ccce8a55f1e1..03725b294286 100644
--- a/net/ipv4/tcp_cdg.c
+++ b/net/ipv4/tcp_cdg.c
@@ -294,12 +294,12 @@ static void tcp_cdg_cong_avoid(struct sock *sk, u32 ack, u32 acked)
 	ca->shadow_wnd = max(ca->shadow_wnd, ca->shadow_wnd + incr);
 }
 
-static void tcp_cdg_acked(struct sock *sk, u32 num_acked, s32 rtt_us)
+static void tcp_cdg_acked(struct sock *sk, const struct ack_sample *sample)
 {
 	struct cdg *ca = inet_csk_ca(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
 
-	if (rtt_us <= 0)
+	if (sample->rtt_us <= 0)
 		return;
 
 	/* A heuristic for filtering delayed ACKs, adapted from:
@@ -307,20 +307,20 @@ static void tcp_cdg_acked(struct sock *sk, u32 num_acked, s32 rtt_us)
 	 * delay and rate based TCP mechanisms." TR 100219A. CAIA, 2010.
 	 */
 	if (tp->sacked_out == 0) {
-		if (num_acked == 1 && ca->delack) {
+		if (sample->pkts_acked == 1 && ca->delack) {
 			/* A delayed ACK is only used for the minimum if it is
 			 * provenly lower than an existing non-zero minimum.
 			 */
-			ca->rtt.min = min(ca->rtt.min, rtt_us);
+			ca->rtt.min = min(ca->rtt.min, sample->rtt_us);
 			ca->delack--;
 			return;
-		} else if (num_acked > 1 && ca->delack < 5) {
+		} else if (sample->pkts_acked > 1 && ca->delack < 5) {
 			ca->delack++;
 		}
 	}
 
-	ca->rtt.min = min_not_zero(ca->rtt.min, rtt_us);
-	ca->rtt.max = max(ca->rtt.max, rtt_us);
+	ca->rtt.min = min_not_zero(ca->rtt.min, sample->rtt_us);
+	ca->rtt.max = max(ca->rtt.max, sample->rtt_us);
 }
 
 static u32 tcp_cdg_ssthresh(struct sock *sk)
-- 
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