--- zzzz-none-000/linux-3.10.107/net/ipv4/tcp_bic.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/net/ipv4/tcp_bic.c	2021-02-04 17:41:59.000000000 +0000
@@ -17,7 +17,6 @@
 #include <linux/module.h>
 #include <net/tcp.h>
 
-
 #define BICTCP_BETA_SCALE    1024	/* Scale factor beta calculation
 					 * max_cwnd = snd_cwnd * beta
 					 */
@@ -46,11 +45,10 @@
 module_param(smooth_part, int, 0644);
 MODULE_PARM_DESC(smooth_part, "log(B/(B*Smin))/log(B/(B-1))+B, # of RTT from Wmax-B to Wmax");
 
-
 /* BIC TCP Parameters */
 struct bictcp {
 	u32	cnt;		/* increase cwnd by 1 after ACKs */
-	u32 	last_max_cwnd;	/* last maximum snd_cwnd */
+	u32	last_max_cwnd;	/* last maximum snd_cwnd */
 	u32	loss_cwnd;	/* congestion window at last loss */
 	u32	last_cwnd;	/* the last snd_cwnd */
 	u32	last_time;	/* time when updated last_cwnd */
@@ -103,7 +101,7 @@
 
 	/* binary increase */
 	if (cwnd < ca->last_max_cwnd) {
-		__u32 	dist = (ca->last_max_cwnd - cwnd)
+		__u32	dist = (ca->last_max_cwnd - cwnd)
 			/ BICTCP_B;
 
 		if (dist > max_increment)
@@ -140,21 +138,20 @@
 		ca->cnt = 1;
 }
 
-static void bictcp_cong_avoid(struct sock *sk, u32 ack, u32 in_flight)
+static void bictcp_cong_avoid(struct sock *sk, u32 ack, u32 acked)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct bictcp *ca = inet_csk_ca(sk);
 
-	if (!tcp_is_cwnd_limited(sk, in_flight))
+	if (!tcp_is_cwnd_limited(sk))
 		return;
 
-	if (tp->snd_cwnd <= tp->snd_ssthresh)
-		tcp_slow_start(tp);
+	if (tcp_in_slow_start(tp))
+		tcp_slow_start(tp, acked);
 	else {
 		bictcp_update(ca, tp->snd_cwnd);
-		tcp_cong_avoid_ai(tp, ca->cnt);
+		tcp_cong_avoid_ai(tp, ca->cnt, 1);
 	}
-
 }
 
 /*
@@ -177,7 +174,6 @@
 
 	ca->loss_cwnd = tp->snd_cwnd;
 
-
 	if (tp->snd_cwnd <= low_window)
 		return max(tp->snd_cwnd >> 1U, 2U);
 	else
@@ -188,6 +184,7 @@
 {
 	const struct tcp_sock *tp = tcp_sk(sk);
 	const struct bictcp *ca = inet_csk_ca(sk);
+
 	return max(tp->snd_cwnd, ca->loss_cwnd);
 }
 
@@ -206,12 +203,12 @@
 
 	if (icsk->icsk_ca_state == TCP_CA_Open) {
 		struct bictcp *ca = inet_csk_ca(sk);
+
 		cnt -= ca->delayed_ack >> ACK_RATIO_SHIFT;
 		ca->delayed_ack += cnt;
 	}
 }
 
-
 static struct tcp_congestion_ops bictcp __read_mostly = {
 	.init		= bictcp_init,
 	.ssthresh	= bictcp_recalc_ssthresh,