tcp-ledbat-test.cc

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/*
 * Copyright (c) 2016 NITK Surathkal
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Ankit Deepak <adadeepak8@gmail.com>
 *
 */
 
#include "ns3/log.h"
#include "ns3/string.h"
#include "ns3/tcp-congestion-ops.h"
#include "ns3/tcp-ledbat.h"
#include "ns3/tcp-socket-base.h"
#include "ns3/test.h"
 
using namespace ns3;
 
NS_LOG_COMPONENT_DEFINE("TcpLedbatTestSuite");
 
class TcpLedbatToNewReno : public TestCase
{
  public:
    TcpLedbatToNewReno(uint32_t cWnd,
                       uint32_t segmentSize,
                       uint32_t ssThresh,
                       uint32_t segmentsAcked,
                       SequenceNumber32 highTxMark,
                       SequenceNumber32 lastAckedSeq,
                       Time rtt,
                       const std::string& name);
 
  private:
    void DoRun() override;
    void ExecuteTest();
 
    uint32_t m_cWnd;                 
    uint32_t m_segmentSize;          
    uint32_t m_segmentsAcked;        
    uint32_t m_ssThresh;             
    Time m_rtt;                      
    SequenceNumber32 m_highTxMark;   
    SequenceNumber32 m_lastAckedSeq; 
    Ptr<TcpSocketState> m_state;     
};
 
TcpLedbatToNewReno::TcpLedbatToNewReno(uint32_t cWnd,
                                       uint32_t segmentSize,
                                       uint32_t ssThresh,
                                       uint32_t segmentsAcked,
                                       SequenceNumber32 highTxMark,
                                       SequenceNumber32 lastAckedSeq,
                                       Time rtt,
                                       const std::string& name)
    : TestCase(name),
      m_cWnd(cWnd),
      m_segmentSize(segmentSize),
      m_segmentsAcked(segmentsAcked),
      m_ssThresh(ssThresh),
      m_rtt(rtt),
      m_highTxMark(highTxMark),
      m_lastAckedSeq(lastAckedSeq)
{
}
 
void
TcpLedbatToNewReno::DoRun()
{
    Simulator::Schedule(Seconds(0.0), &TcpLedbatToNewReno::ExecuteTest, this);
    Simulator::Run();
    Simulator::Destroy();
}
 
void
TcpLedbatToNewReno::ExecuteTest()
{
    m_state = CreateObject<TcpSocketState>();
    m_state->m_cWnd = m_cWnd;
    m_state->m_ssThresh = m_ssThresh;
    m_state->m_segmentSize = m_segmentSize;
    m_state->m_highTxMark = m_highTxMark;
    m_state->m_lastAckedSeq = m_lastAckedSeq;
 
    Ptr<TcpSocketState> state = CreateObject<TcpSocketState>();
    state->m_cWnd = m_cWnd;
    state->m_ssThresh = m_ssThresh;
    state->m_segmentSize = m_segmentSize;
    state->m_highTxMark = m_highTxMark;
    state->m_lastAckedSeq = m_lastAckedSeq;
 
    Ptr<TcpLedbat> cong = CreateObject<TcpLedbat>();
    cong->IncreaseWindow(m_state, m_segmentsAcked);
 
    Ptr<TcpNewReno> NewRenoCong = CreateObject<TcpNewReno>();
    NewRenoCong->IncreaseWindow(state, m_segmentsAcked);
 
    NS_TEST_ASSERT_MSG_EQ(m_state->m_cWnd.Get(),
                          state->m_cWnd.Get(),
                          "cWnd has not updated correctly");
}
 
class TcpLedbatIncrementTest : public TestCase
{
  public:
    TcpLedbatIncrementTest(uint32_t cWnd,
                           uint32_t segmentSize,
                           uint32_t ssThresh,
                           uint32_t segmentsAcked,
                           SequenceNumber32 highTxMark,
                           SequenceNumber32 lastAckedSeq,
                           Time rtt,
                           const std::string& name);
 
  private:
    void DoRun() override;
    void ExecuteTest();
 
    uint32_t m_cWnd;                 
    uint32_t m_segmentSize;          
    uint32_t m_segmentsAcked;        
    uint32_t m_ssThresh;             
    Time m_rtt;                      
    SequenceNumber32 m_highTxMark;   
    SequenceNumber32 m_lastAckedSeq; 
    Ptr<TcpSocketState> m_state;     
};
 
TcpLedbatIncrementTest::TcpLedbatIncrementTest(uint32_t cWnd,
                                               uint32_t segmentSize,
                                               uint32_t ssThresh,
                                               uint32_t segmentsAcked,
                                               SequenceNumber32 highTxMark,
                                               SequenceNumber32 lastAckedSeq,
                                               Time rtt,
                                               const std::string& name)
    : TestCase(name),
      m_cWnd(cWnd),
      m_segmentSize(segmentSize),
      m_segmentsAcked(segmentsAcked),
      m_ssThresh(ssThresh),
      m_rtt(rtt),
      m_highTxMark(highTxMark),
      m_lastAckedSeq(lastAckedSeq)
{
}
 
void
TcpLedbatIncrementTest::DoRun()
{
    Simulator::Schedule(Seconds(0.0), &TcpLedbatIncrementTest::ExecuteTest, this);
    Simulator::Run();
    Simulator::Destroy();
}
 
void
TcpLedbatIncrementTest::ExecuteTest()
{
    m_state = CreateObject<TcpSocketState>();
    m_state->m_cWnd = m_cWnd;
    m_state->m_ssThresh = m_ssThresh;
    m_state->m_segmentSize = m_segmentSize;
    m_state->m_highTxMark = m_highTxMark;
    m_state->m_lastAckedSeq = m_lastAckedSeq;
 
    Ptr<TcpLedbat> cong = CreateObject<TcpLedbat>();
    cong->SetAttribute("SSParam", StringValue("no"));
    cong->SetAttribute("NoiseFilterLen", UintegerValue(1));
 
    m_state->m_rcvTimestampValue = 2;
    m_state->m_rcvTimestampEchoReply = 1;
    cong->PktsAcked(m_state, m_segmentsAcked, m_rtt);
 
    m_state->m_rcvTimestampValue = 7;
    m_state->m_rcvTimestampEchoReply = 4;
    cong->PktsAcked(m_state, m_segmentsAcked, m_rtt);
 
    cong->IncreaseWindow(m_state, m_segmentsAcked);
 
    m_cWnd = m_cWnd + ((0.98 * m_segmentsAcked * m_segmentSize * m_segmentSize) / m_cWnd);
 
    NS_TEST_ASSERT_MSG_EQ(m_state->m_cWnd.Get(), m_cWnd, "cWnd has not updated correctly");
}
 
class TcpLedbatDecrementTest : public TestCase
{
  public:
    TcpLedbatDecrementTest(uint32_t cWnd,
                           uint32_t segmentSize,
                           uint32_t ssThresh,
                           uint32_t segmentsAcked,
                           SequenceNumber32 highTxMark,
                           SequenceNumber32 lastAckedSeq,
                           Time rtt,
                           const std::string& name);
 
  private:
    void DoRun() override;
    void ExecuteTest();
 
    uint32_t m_cWnd;                 
    uint32_t m_segmentSize;          
    uint32_t m_segmentsAcked;        
    uint32_t m_ssThresh;             
    Time m_rtt;                      
    SequenceNumber32 m_highTxMark;   
    SequenceNumber32 m_lastAckedSeq; 
    Ptr<TcpSocketState> m_state;     
};
 
TcpLedbatDecrementTest::TcpLedbatDecrementTest(uint32_t cWnd,
                                               uint32_t segmentSize,
                                               uint32_t ssThresh,
                                               uint32_t segmentsAcked,
                                               SequenceNumber32 highTxMark,
                                               SequenceNumber32 lastAckedSeq,
                                               Time rtt,
                                               const std::string& name)
    : TestCase(name),
      m_cWnd(cWnd),
      m_segmentSize(segmentSize),
      m_segmentsAcked(segmentsAcked),
      m_ssThresh(ssThresh),
      m_rtt(rtt),
      m_highTxMark(highTxMark),
      m_lastAckedSeq(lastAckedSeq)
{
}
 
void
TcpLedbatDecrementTest::DoRun()
{
    Simulator::Schedule(Seconds(0.0), &TcpLedbatDecrementTest::ExecuteTest, this);
    Simulator::Run();
    Simulator::Destroy();
}
 
void
TcpLedbatDecrementTest::ExecuteTest()
{
    UintegerValue minCwnd;
    m_state = CreateObject<TcpSocketState>();
    m_state->m_cWnd = m_cWnd;
    m_state->m_ssThresh = m_ssThresh;
    m_state->m_segmentSize = m_segmentSize;
    m_state->m_highTxMark = m_highTxMark;
    m_state->m_lastAckedSeq = m_lastAckedSeq;
 
    Ptr<TcpLedbat> cong = CreateObject<TcpLedbat>();
    cong->SetAttribute("SSParam", StringValue("no"));
    cong->SetAttribute("NoiseFilterLen", UintegerValue(1));
    cong->GetAttribute("MinCwnd", minCwnd);
 
    m_state->m_rcvTimestampValue = 2;
    m_state->m_rcvTimestampEchoReply = 1;
    cong->PktsAcked(m_state, m_segmentsAcked, m_rtt);
 
    m_state->m_rcvTimestampValue = 205;
    m_state->m_rcvTimestampEchoReply = 6;
    cong->PktsAcked(m_state, m_segmentsAcked, m_rtt);
 
    cong->IncreaseWindow(m_state, m_segmentsAcked);
 
    m_cWnd = m_cWnd - ((0.98 * m_segmentsAcked * m_segmentSize * m_segmentSize) / m_cWnd);
    m_cWnd = std::max(m_cWnd, static_cast<uint32_t>(m_segmentSize * minCwnd.Get()));
 
    NS_TEST_ASSERT_MSG_EQ(m_state->m_cWnd.Get(), m_cWnd, "cWnd has not updated correctly");
}
 
class TcpLedbatTestSuite : public TestSuite
{
  public:
    TcpLedbatTestSuite()
        : TestSuite("tcp-ledbat-test", UNIT)
    {
        AddTestCase(new TcpLedbatToNewReno(2 * 1446,
                                           1446,
                                           4 * 1446,
                                           2,
                                           SequenceNumber32(4753),
                                           SequenceNumber32(3216),
                                           MilliSeconds(100),
                                           "LEDBAT falls to New Reno for slowstart"),
                    TestCase::QUICK);
        AddTestCase(new TcpLedbatToNewReno(4 * 1446,
                                           1446,
                                           2 * 1446,
                                           2,
                                           SequenceNumber32(4753),
                                           SequenceNumber32(3216),
                                           MilliSeconds(100),
                                           "LEDBAT falls to New Reno if timestamps are not found"),
                    TestCase::QUICK);
        AddTestCase(new TcpLedbatIncrementTest(2 * 1446,
                                               1446,
                                               4 * 1446,
                                               2,
                                               SequenceNumber32(4753),
                                               SequenceNumber32(3216),
                                               MilliSeconds(100),
                                               "LEDBAT increment test"),
                    TestCase::QUICK);
        AddTestCase(new TcpLedbatDecrementTest(2 * 1446,
                                               1446,
                                               4 * 1446,
                                               2,
                                               SequenceNumber32(4753),
                                               SequenceNumber32(3216),
                                               MilliSeconds(100),
                                               "LEDBAT decrement test"),
                    TestCase::QUICK);
    }
};
 
static TcpLedbatTestSuite g_tcpledbatTest;