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/*
* Copyright 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.wifi;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import androidx.test.filters.SmallTest;
import org.junit.Before;
import org.junit.Test;
import java.util.Random;
/**
* Unit tests for {@link com.android.server.wifi.WifiLinkLayerStats}.
*/
@SmallTest
public class WifiLinkLayerStatsTest {
ExtendedWifiInfo mWifiInfo;
WifiLinkLayerStats mWifiLinkLayerStats;
Random mRandom = new Random();
/**
* Sets up for unit test
*/
@Before
public void setUp() throws Exception {
mWifiInfo = new ExtendedWifiInfo();
mWifiLinkLayerStats = new WifiLinkLayerStats();
}
/**
* Increments the counters
*
* The values are carved up among the 4 classes (be, bk, vi, vo) so the totals come out right.
*/
private void bumpCounters(WifiLinkLayerStats s, int txg, int txr, int txb, int rxg) {
int a = mRandom.nextInt(31);
int b = mRandom.nextInt(31);
int m0 = a & b;
int m1 = a & ~b;
int m2 = ~a & b;
int m3 = ~a & ~b;
assertEquals(-1, m0 + m1 + m2 + m3);
s.rxmpdu_be += rxg & m0;
s.txmpdu_be += txg & m0;
s.lostmpdu_be += txb & m0;
s.retries_be += txr & m0;
s.rxmpdu_bk += rxg & m1;
s.txmpdu_bk += txg & m1;
s.lostmpdu_bk += txb & m1;
s.retries_bk += txr & m1;
s.rxmpdu_vi += rxg & m2;
s.txmpdu_vi += txg & m2;
s.lostmpdu_vi += txb & m2;
s.retries_vi += txr & m2;
s.rxmpdu_vo += rxg & m3;
s.txmpdu_vo += txg & m3;
s.lostmpdu_vo += txb & m3;
s.retries_vo += txr & m3;
}
/**
*
* Check that average rates converge to the right values
*
* Check that the total packet counts are correct
*
*/
@Test
public void checkThatAverageRatesConvergeToTheRightValuesAndTotalsAreRight() throws Exception {
int txg = mRandom.nextInt(1000);
int txr = mRandom.nextInt(100);
int txb = mRandom.nextInt(100);
int rxg = mRandom.nextInt(1000);
int n = 3 * 5; // Time constant is 3 seconds, 5 times time constant should get 99% there
for (int i = 0; i < n; i++) {
bumpCounters(mWifiLinkLayerStats, txg, txr, txb, rxg);
mWifiLinkLayerStats.timeStampInMs += 1000;
mWifiInfo.updatePacketRates(mWifiLinkLayerStats, mWifiLinkLayerStats.timeStampInMs);
}
// assertEquals(double, double, double) takes a tolerance as the third argument
assertEquals((double) txg, mWifiInfo.txSuccessRate, txg * 0.02);
assertEquals((double) txr, mWifiInfo.txRetriesRate, txr * 0.02);
assertEquals((double) txb, mWifiInfo.txBadRate, txb * 0.02);
assertEquals((double) rxg, mWifiInfo.rxSuccessRate, rxg * 0.02);
assertEquals(mWifiInfo.txSuccess, n * txg);
assertEquals(mWifiInfo.txRetries, n * txr);
assertEquals(mWifiInfo.txBad, n * txb);
assertEquals(mWifiInfo.rxSuccess, n * rxg);
}
/**
* A single packet in a short period of time should have small effect
*/
@Test
public void aSinglePacketInAShortPeriodOfTimeShouldHaveSmallEffect() throws Exception {
bumpCounters(mWifiLinkLayerStats, 999999999, 999999999, 999999999, 99999999);
mWifiLinkLayerStats.timeStampInMs = 999999999;
mWifiInfo.updatePacketRates(mWifiLinkLayerStats, mWifiLinkLayerStats.timeStampInMs);
assertEquals(0.0, mWifiInfo.txSuccessRate, 0.0001);
bumpCounters(mWifiLinkLayerStats, 1, 1, 1, 1);
mWifiLinkLayerStats.timeStampInMs += 1;
mWifiInfo.updatePacketRates(mWifiLinkLayerStats, mWifiLinkLayerStats.timeStampInMs);
assertEquals(0.33, mWifiInfo.txSuccessRate, 0.01);
}
/**
* Check for bad interactions with the alternative updatePacketRates method
*/
@Test
public void afterSourceSwitchTheRatesShouldGetReset() throws Exception {
// Do some updates using link layer stats
bumpCounters(mWifiLinkLayerStats, 999, 999, 999, 999);
mWifiLinkLayerStats.timeStampInMs = 999999999;
mWifiInfo.updatePacketRates(mWifiLinkLayerStats, mWifiLinkLayerStats.timeStampInMs);
assertEquals(0.0, mWifiInfo.txSuccessRate, 0.0001);
assertEquals(0.0, mWifiInfo.rxSuccessRate, 0.0001);
bumpCounters(mWifiLinkLayerStats, 1_000_000_000, 777000, 66600, 1_000_100_000);
mWifiLinkLayerStats.timeStampInMs += 10_000;
mWifiInfo.updatePacketRates(mWifiLinkLayerStats, mWifiLinkLayerStats.timeStampInMs);
assertTrue("" + mWifiInfo + " " + mWifiLinkLayerStats, mWifiInfo.txSuccessRate > 0.95e+8);
assertTrue("" + mWifiInfo + " " + mWifiLinkLayerStats, mWifiInfo.rxSuccessRate > 0.95e+8);
// Now update with traffic counters
mWifiLinkLayerStats.timeStampInMs += 10_000;
mWifiInfo.updatePacketRates(2_000_000_000L, 2_000_000_000L,
mWifiLinkLayerStats.timeStampInMs);
// Despite the increase, the rates should be zero after the change in source
assertEquals(0.0, mWifiInfo.txSuccessRate, 0.0001);
assertEquals(0.0, mWifiInfo.rxSuccessRate, 0.0001);
assertEquals(0, mWifiInfo.txBad);
assertEquals(0, mWifiInfo.txRetries);
// Make sure that updates from this source work, too
mWifiLinkLayerStats.timeStampInMs += 10_000;
mWifiInfo.updatePacketRates(3_000_000_000L, 3_000_000_000L,
mWifiLinkLayerStats.timeStampInMs);
assertTrue(mWifiInfo.txSuccessRate > 0.95e+8);
assertTrue(mWifiInfo.rxSuccessRate > 0.95e+8);
// Switch back to using link layer stats
mWifiLinkLayerStats.timeStampInMs += 10_000;
bumpCounters(mWifiLinkLayerStats, 1_000_000_000, 777000, 66600, 1_000_100_000);
mWifiInfo.updatePacketRates(mWifiLinkLayerStats, mWifiLinkLayerStats.timeStampInMs);
assertEquals(0.0, mWifiInfo.txSuccessRate, 0.0001);
assertEquals(0.0, mWifiInfo.rxSuccessRate, 0.0001);
}
}
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