From a0e0018c9a7ef5ce7f6d2c3ae16aecbbd16a8f67 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 4 May 2024 16:18:53 +0200
Subject: Adding upstream version 6.1.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 tc/tc_estimator.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 tc/tc_estimator.c

(limited to 'tc/tc_estimator.c')

diff --git a/tc/tc_estimator.c b/tc/tc_estimator.c
new file mode 100644
index 0000000..f494b7c
--- /dev/null
+++ b/tc/tc_estimator.c
@@ -0,0 +1,45 @@
+/*
+ * tc_core.c		TC core library.
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <math.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+
+#include "utils.h"
+#include "tc_core.h"
+
+int tc_setup_estimator(unsigned int A, unsigned int time_const, struct tc_estimator *est)
+{
+	for (est->interval = 0; est->interval <= 5; est->interval++) {
+		if (A <= (1<<est->interval)*(TIME_UNITS_PER_SEC/4))
+			break;
+	}
+	if (est->interval > 5)
+		return -1;
+	est->interval -= 2;
+	for (est->ewma_log = 1; est->ewma_log < 32; est->ewma_log++) {
+		double w = 1.0 - 1.0/(1<<est->ewma_log);
+
+		if (A/(-log(w)) > time_const)
+			break;
+	}
+	est->ewma_log--;
+	if (est->ewma_log == 0 || est->ewma_log >= 31)
+		return -1;
+	return 0;
+}
-- 
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