srsRAN_4G/lib/test/mac/mac_pdu_nr_test.cc

/**
 *
 * \section COPYRIGHT
 *
 * Copyright 2013-2021 Software Radio Systems Limited
 *
 * By using this file, you agree to the terms and conditions set
 * forth in the LICENSE file which can be found at the top level of
 * the distribution.
 *
 */

#include "srsran/common/mac_pcap.h"
#include "srsran/common/string_helpers.h"
#include "srsran/common/test_common.h"
#include "srsran/config.h"
#include "srsran/mac/mac_rar_pdu_nr.h"
#include "srsran/mac/mac_sch_pdu_nr.h"

#include <array>
#include <iostream>
#include <memory>
#include <vector>

#define PCAP 0
#define PCAP_CRNTI (0x1001)
#define PCAP_RAR_RNTI (0x0016)
#define PCAP_TTI (666)

using namespace srsran;

static std::unique_ptr<srsran::mac_pcap> pcap_handle = nullptr;

int mac_dl_sch_pdu_unpack_and_pack_test1()
{
  // MAC PDU with DL-SCH subheader with 8-bit length field
  // Bit 1-8
  // |   |   |   |   |   |   |   |   |
  // | R |F=0|         LCID          |  Octet 1
  // |               L               |  Octet 1

  // TV1 - MAC PDU with short subheader for CCCH, MAC SDU length is 8 B, total PDU is 10 B
  uint8_t mac_dl_sch_pdu_1[] = {0x00, 0x08, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88};

  if (pcap_handle) {
    pcap_handle->write_dl_crnti_nr(mac_dl_sch_pdu_1, sizeof(mac_dl_sch_pdu_1), PCAP_CRNTI, true, PCAP_TTI);
  }

  srsran::mac_sch_pdu_nr pdu;
  pdu.unpack(mac_dl_sch_pdu_1, sizeof(mac_dl_sch_pdu_1));
  TESTASSERT(pdu.get_num_subpdus() == 1);

  mac_sch_subpdu_nr subpdu = pdu.get_subpdu(0);
  TESTASSERT(subpdu.get_total_length() == 10);
  TESTASSERT(subpdu.get_sdu_length() == 8);
  TESTASSERT(subpdu.get_lcid() == 0);

  // pack PDU again
  byte_buffer_t tx_buffer;

  srsran::mac_sch_pdu_nr tx_pdu;
  tx_pdu.init_tx(&tx_buffer, sizeof(mac_dl_sch_pdu_1));

  // Add SDU part of TV from above
  tx_pdu.add_sdu(0, &mac_dl_sch_pdu_1[2], 8);

  TESTASSERT(tx_pdu.get_remaing_len() == 0);
  TESTASSERT(tx_buffer.N_bytes == sizeof(mac_dl_sch_pdu_1));
  TESTASSERT(memcmp(tx_buffer.msg, mac_dl_sch_pdu_1, tx_buffer.N_bytes) == 0);

  if (pcap_handle) {
    pcap_handle->write_dl_crnti_nr(tx_buffer.msg, tx_buffer.N_bytes, PCAP_CRNTI, true, PCAP_TTI);
  }

  auto& mac_logger = srslog::fetch_basic_logger("MAC");
  mac_logger.info(tx_buffer.msg, tx_buffer.N_bytes, "Generated MAC PDU (%d B)", tx_buffer.N_bytes);

  return SRSRAN_SUCCESS;
}

int mac_dl_sch_pdu_unpack_test2()
{
  // MAC PDU with DL-SCH subheader with 16-bit length field
  // Bit 1-8
  // |   |   |   |   |   |   |   |   |
  // | R |F=1|         LCID          |  Octet 1
  // |               L               |  Octet 2
  // |               L               |  Octet 3

  // Note: Pack test is not working in this case as it would generate a PDU with the short length field only

  // TV2 - MAC PDU with long subheader for LCID=2, MAC SDU length is 8 B, total PDU is 11 B
  uint8_t mac_dl_sch_pdu_2[] = {0x42, 0x00, 0x08, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88};

  if (pcap_handle) {
    pcap_handle->write_dl_crnti_nr(mac_dl_sch_pdu_2, sizeof(mac_dl_sch_pdu_2), PCAP_CRNTI, true, PCAP_TTI);
  }

  srsran::mac_sch_pdu_nr pdu;
  pdu.unpack(mac_dl_sch_pdu_2, sizeof(mac_dl_sch_pdu_2));
  TESTASSERT(pdu.get_num_subpdus() == 1);
  mac_sch_subpdu_nr subpdu = pdu.get_subpdu(0);
  TESTASSERT(subpdu.get_total_length() == 11);
  TESTASSERT(subpdu.get_sdu_length() == 8);
  TESTASSERT(subpdu.get_lcid() == 2);

  return SRSRAN_SUCCESS;
}

int mac_dl_sch_pdu_pack_test3()
{
  // MAC PDU with DL-SCH subheader with 16-bit length field (512 B SDU + 3 B header)
  // Bit 1-8
  // |   |   |   |   |   |   |   |   |
  // | R |F=1|         LCID          |  Octet 1
  // |               L               |  Octet 2
  // |               L               |  Octet 3

  uint8_t sdu[512] = {};

  // populate SDU payload
  for (uint32_t i = 0; i < 512; i++) {
    sdu[i] = i % 256;
  }

  // pack buffer
  byte_buffer_t tx_buffer;

  srsran::mac_sch_pdu_nr tx_pdu;
  tx_pdu.init_tx(&tx_buffer, 1024);

  // Add SDU
  tx_pdu.add_sdu(4, sdu, sizeof(sdu));

  TESTASSERT(tx_pdu.get_remaing_len() == 509);
  TESTASSERT(tx_buffer.N_bytes == 515);

  if (pcap_handle) {
    pcap_handle->write_dl_crnti_nr(tx_buffer.msg, tx_buffer.N_bytes, PCAP_CRNTI, true, PCAP_TTI);
  }

  auto& mac_logger = srslog::fetch_basic_logger("MAC");
  mac_logger.info(tx_buffer.msg, tx_buffer.N_bytes, "Generated MAC PDU (%d B)", tx_buffer.N_bytes);

  return SRSRAN_SUCCESS;
}

int mac_dl_sch_pdu_pack_test4()
{
  // MAC PDU with only padding
  // Bit 1-8
  // |   |   |   |   |   |   |   |   |
  // | R | R |         LCID          |  Octet 1
  // |              zeros            |  Octet ..

  // TV2 - MAC PDU with a single LCID with padding only
  uint8_t tv[] = {0x3f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

  const uint32_t pdu_size = 8;
  byte_buffer_t  tx_buffer;

  // modify buffer (to be nulled during PDU packing
  tx_buffer.msg[4] = 0xaa;

  srsran::mac_sch_pdu_nr tx_pdu;
  tx_pdu.init_tx(&tx_buffer, pdu_size);

  TESTASSERT(tx_pdu.get_remaing_len() == pdu_size);
  tx_pdu.pack();
  TESTASSERT(tx_buffer.N_bytes == pdu_size);
  TESTASSERT(tx_buffer.N_bytes == sizeof(tv));

  TESTASSERT(memcmp(tx_buffer.msg, tv, tx_buffer.N_bytes) == 0);

  if (pcap_handle) {
    pcap_handle->write_dl_crnti_nr(tx_buffer.msg, tx_buffer.N_bytes, PCAP_CRNTI, true, PCAP_TTI);
  }

  auto& mac_logger = srslog::fetch_basic_logger("MAC");
  mac_logger.info(tx_buffer.msg, tx_buffer.N_bytes, "Generated MAC PDU (%d B)", tx_buffer.N_bytes);

  return SRSRAN_SUCCESS;
}

int mac_dl_sch_pdu_pack_test5()
{
  // MAC PDU with DL-SCH subheader with 8-bit length field and padding after that
  // Bit 1-8
  // |   |   |   |   |   |   |   |   |
  // | R |F=0|         LCID          |  Octet 1
  // |               L               |  Octet 2
  // |              zeros            |  Octet 3-10
  // | R | R |         LCID          |  Octet 11
  // |              zeros            |  Octet ..

  // TV2 - MAC PDU with a single LCID with padding only
  uint8_t tv[] = {0x01, 0x08, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x3f, 0x00, 0x00, 0x00, 0x00, 0x00};

  const uint32_t pdu_size = 16;
  byte_buffer_t  tx_buffer;
  tx_buffer.clear();

  srsran::mac_sch_pdu_nr tx_pdu;
  tx_pdu.init_tx(&tx_buffer, pdu_size);

  // Add SDU part of TV from above
  tx_pdu.add_sdu(1, &tv[2], 8);

  TESTASSERT(tx_pdu.get_remaing_len() == 6);

  tx_pdu.pack();

  TESTASSERT(tx_pdu.get_remaing_len() == 0);
  TESTASSERT(tx_buffer.N_bytes == pdu_size);
  TESTASSERT(tx_buffer.N_bytes == sizeof(tv));
  TESTASSERT(memcmp(tx_buffer.msg, tv, tx_buffer.N_bytes) == 0);

  if (pcap_handle) {
    pcap_handle->write_dl_crnti_nr(tx_buffer.msg, tx_buffer.N_bytes, PCAP_CRNTI, true, PCAP_TTI);
  }

  // pretty print PDU
  fmt::memory_buffer buff;
  tx_pdu.to_string(buff);

  auto& mac_logger = srslog::fetch_basic_logger("MAC");
  mac_logger.info(
      tx_buffer.msg, tx_buffer.N_bytes, "Generated MAC PDU (%d B): %s", tx_buffer.N_bytes, srsran::to_c_str(buff));

  return SRSRAN_SUCCESS;
}

int mac_dl_sch_pdu_unpack_test6()
{
  // MAC PDU with DL-SCH subheader reserved LCID
  // Bit 1-8
  // |   |   |   |   |   |   |   |   |
  // | R |F=1|         LCID          |  Octet 1
  // |               L               |  Octet 2

  // TV2 - MAC PDU with reserved LCID (46=0x2e)
  uint8_t mac_dl_sch_pdu_2[] = {0x2e, 0x04, 0x11, 0x22, 0x33, 0x44};

  if (pcap_handle) {
    pcap_handle->write_dl_crnti_nr(mac_dl_sch_pdu_2, sizeof(mac_dl_sch_pdu_2), PCAP_CRNTI, true, PCAP_TTI);
  }

  srsran::mac_sch_pdu_nr pdu;
  pdu.unpack(mac_dl_sch_pdu_2, sizeof(mac_dl_sch_pdu_2));
  TESTASSERT(pdu.get_num_subpdus() == 0);

  return SRSRAN_SUCCESS;
}

int mac_rar_pdu_test7()
{
  // MAC PDU with RAR PDU with single RAPID=0
  // rapid=0
  // ta=180
  // ul_grant:
  //   hopping_flag=0
  //   riv=0x1
  //   time_domain_rsc=1
  //   mcs=4
  //   tpc_command=3
  //   csi_request=0
  // tc-rnti=0x4616

  // Bit 1-8
  // |   |   |   |   |   |   |   |   |
  // | R |T=1|        RAPID=0        |  Octet 1
  // |              RAR              |  Octet 2-8
  const uint32_t tv_rapid                                         = 0;
  const uint32_t tv_ta                                            = 180;
  const uint16_t tv_tcrnti                                        = 0x4616;
  const uint8_t  tv_msg3_grant[mac_rar_subpdu_nr::UL_GRANT_NBITS] = {
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
      0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x01, 0x00}; // unpacked UL grant

  uint8_t mac_dl_rar_pdu[] = {0x40, 0x05, 0xa0, 0x00, 0x11, 0x46, 0x46, 0x16, 0x00, 0x00, 0x00};

  if (pcap_handle) {
    pcap_handle->write_dl_ra_rnti_nr(mac_dl_rar_pdu, sizeof(mac_dl_rar_pdu), PCAP_RAR_RNTI, true, PCAP_TTI);
  }

  srsran::mac_rar_pdu_nr pdu;
  TESTASSERT(pdu.unpack(mac_dl_rar_pdu, sizeof(mac_dl_rar_pdu)) == true);

  fmt::memory_buffer buff;
  pdu.to_string(buff);

  auto& mac_logger = srslog::fetch_basic_logger("MAC");
  mac_logger.info("Rx PDU: %s", srsran::to_c_str(buff));

  TESTASSERT(pdu.get_num_subpdus() == 1);

  mac_rar_subpdu_nr subpdu = pdu.get_subpdu(0);
  TESTASSERT(subpdu.has_rapid() == true);
  TESTASSERT(subpdu.has_backoff() == false);
  TESTASSERT(subpdu.get_temp_crnti() == tv_tcrnti);
  TESTASSERT(subpdu.get_ta() == tv_ta);
  TESTASSERT(subpdu.get_rapid() == tv_rapid);

  std::array<uint8_t, mac_rar_subpdu_nr::UL_GRANT_NBITS> msg3_grant = subpdu.get_ul_grant();
  TESTASSERT(memcmp(msg3_grant.data(), tv_msg3_grant, msg3_grant.size()) == 0);

  // pack again
  const uint32_t pdu_size = 11;
  byte_buffer_t  tx_buffer;
  tx_buffer.clear();

  srsran::mac_rar_pdu_nr tx_pdu;
  tx_pdu.init_tx(&tx_buffer, pdu_size);

  mac_rar_subpdu_nr& rar_subpdu = tx_pdu.add_subpdu();
  rar_subpdu.set_ta(tv_ta);
  rar_subpdu.set_rapid(tv_rapid);
  rar_subpdu.set_temp_crnti(tv_tcrnti);
  rar_subpdu.set_ul_grant(msg3_grant);

  TESTASSERT(tx_pdu.pack() == SRSRAN_SUCCESS);
  TESTASSERT(tx_buffer.N_bytes == sizeof(mac_dl_rar_pdu));
  TESTASSERT(memcmp(tx_buffer.msg, mac_dl_rar_pdu, tx_buffer.N_bytes) == 0);

  tx_pdu.to_string(buff);
  mac_logger.info("Tx PDU: %s", srsran::to_c_str(buff));

  if (pcap_handle) {
    pcap_handle->write_dl_ra_rnti_nr(tx_buffer.msg, tx_buffer.N_bytes, PCAP_RAR_RNTI, true, PCAP_TTI);
  }

  return SRSRAN_SUCCESS;
}

int mac_rar_pdu_unpack_test8()
{
  // Malformed MAC PDU, says it has RAR PDU but is too short to include MAC RAR

  // Bit 1-8
  // |   |   |   |   |   |   |   |   |
  // | E |T=1|        RAPID=0        |  Octet 1
  // |            RAR_fragment       |  Octet 2
  uint8_t mac_dl_rar_pdu[] = {0x40, 0x05};

  if (pcap_handle) {
    pcap_handle->write_dl_ra_rnti_nr(mac_dl_rar_pdu, sizeof(mac_dl_rar_pdu), 0x0016, true, PCAP_TTI);
  }

  // unpacking should fail
  srsran::mac_rar_pdu_nr pdu;
  TESTASSERT(pdu.unpack(mac_dl_rar_pdu, sizeof(mac_dl_rar_pdu)) == false);
  TESTASSERT(pdu.get_num_subpdus() == 0);

  // Malformed PDU with reserved bits set
  // Bit 1-8
  // |   |   |   |   |   |   |   |   |
  // | E |T=0| R | R |      BI       |  Octet 1
  uint8_t mac_dl_rar_pdu2[] = {0x10};
  TESTASSERT(pdu.unpack(mac_dl_rar_pdu2, sizeof(mac_dl_rar_pdu2)) == false);
  TESTASSERT(pdu.get_num_subpdus() == 0);

  return SRSRAN_SUCCESS;
}

int mac_dl_sch_pdu_unpack_test9()
{
  // MAC PDU with Timing Advance CE and padding
  uint8_t tv[] = {0x3d, 0x1f, 0x3f, 0x00, 0x00, 0x00};

  if (pcap_handle) {
    pcap_handle->write_dl_crnti_nr(tv, sizeof(tv), PCAP_CRNTI, true, PCAP_TTI);
  }

  srsran::mac_sch_pdu_nr pdu;
  pdu.unpack(tv, sizeof(tv));
  TESTASSERT(pdu.get_num_subpdus() == 2);
  mac_sch_subpdu_nr subpdu = pdu.get_subpdu(0);

  TESTASSERT(subpdu.get_ta().tag_id == 0);
  TESTASSERT(subpdu.get_ta().ta_command == 31);

  return SRSRAN_SUCCESS;
}

int mac_ul_sch_pdu_unpack_test1()
{
  // UL-SCH MAC PDU with fixed-size CE and DL-SCH subheader with 16-bit length field
  // Note: this is a malformed UL-SCH PDU has SDU is placed after the CE
  // Bit 1-8
  // |   |   |   |   |   |   |   |   |
  // | R | R |         LCID          |  Octet 1 (C-RNTI LCID = 0x )
  // |            C-RNTI             |  Octet 2
  // |            C-RNTI             |  Octet 3
  // | R |F=1|         LCID          |  Octet 4
  // |               L               |  Octet 5
  // |               L               |  Octet 6
  // |             data              |  Octet 7-x

  // TV3 - UL-SCH MAC PDU with long subheader for LCID=2, MAC SDU length is 4 B, total PDU is 9 B
  const uint8_t ul_sch_crnti[]     = {0x11, 0x22};
  uint8_t       mac_ul_sch_pdu_1[] = {0x3a, 0x11, 0x22, 0x43, 0x00, 0x04, 0x11, 0x22, 0x33, 0x44};

  if (pcap_handle) {
    pcap_handle->write_ul_crnti_nr(mac_ul_sch_pdu_1, sizeof(mac_ul_sch_pdu_1), PCAP_CRNTI, true, PCAP_TTI);
  }

  srsran::mac_sch_pdu_nr pdu(true);
  pdu.unpack(mac_ul_sch_pdu_1, sizeof(mac_ul_sch_pdu_1));
  TESTASSERT(pdu.get_num_subpdus() == 2);

  // First subpdu is C-RNTI CE
  mac_sch_subpdu_nr subpdu0 = pdu.get_subpdu(0);
  TESTASSERT(subpdu0.get_total_length() == 3);
  TESTASSERT(subpdu0.get_sdu_length() == 2);
  TESTASSERT(subpdu0.get_lcid() == mac_sch_subpdu_nr::CRNTI);
  TESTASSERT(memcmp(subpdu0.get_sdu(), (uint8_t*)&ul_sch_crnti, sizeof(ul_sch_crnti)) == 0);

  // Second subpdu is UL-SCH
  mac_sch_subpdu_nr subpdu1 = pdu.get_subpdu(1);
  TESTASSERT(subpdu1.get_total_length() == 7);
  TESTASSERT(subpdu1.get_sdu_length() == 4);
  TESTASSERT(subpdu1.get_lcid() == 3);

  return SRSRAN_SUCCESS;
}

int mac_ul_sch_pdu_unpack_and_pack_test2()
{
  // MAC PDU with UL-SCH (for UL-CCCH) subheader
  // Bit 1-8
  // |   |   |   |   |   |   |   |   |
  // | R | R |         LCID          |  Octet 1

  // TV1 - MAC PDU with short subheader for CCCH, MAC SDU length is 8 B, total PDU is 10 B
  uint8_t mac_ul_sch_pdu_1[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88};

  if (pcap_handle) {
    pcap_handle->write_ul_crnti_nr(mac_ul_sch_pdu_1, sizeof(mac_ul_sch_pdu_1), PCAP_CRNTI, true, PCAP_TTI);
  }

  srsran::mac_sch_pdu_nr pdu(true);
  pdu.unpack(mac_ul_sch_pdu_1, sizeof(mac_ul_sch_pdu_1));
  TESTASSERT(pdu.get_num_subpdus() == 1);

  mac_sch_subpdu_nr subpdu = pdu.get_subpdu(0);
  TESTASSERT(subpdu.get_total_length() == 9);
  TESTASSERT(subpdu.get_sdu_length() == 8);
  TESTASSERT(subpdu.get_lcid() == 0);

  // pack PDU again
  byte_buffer_t tx_buffer;

  srsran::mac_sch_pdu_nr tx_pdu;
  tx_pdu.init_tx(&tx_buffer, sizeof(mac_ul_sch_pdu_1), true);

  // Add SDU part of TV from above
  tx_pdu.add_sdu(0, &mac_ul_sch_pdu_1[1], 8);

  TESTASSERT(tx_pdu.get_remaing_len() == 0);
  TESTASSERT(tx_buffer.N_bytes == sizeof(mac_ul_sch_pdu_1));
  TESTASSERT(memcmp(tx_buffer.msg, mac_ul_sch_pdu_1, tx_buffer.N_bytes) == 0);

  if (pcap_handle) {
    pcap_handle->write_ul_crnti_nr(tx_buffer.msg, tx_buffer.N_bytes, PCAP_CRNTI, true, PCAP_TTI);
  }

  auto& mac_logger = srslog::fetch_basic_logger("MAC");
  mac_logger.info(tx_buffer.msg, tx_buffer.N_bytes, "Generated MAC PDU (%d B)", tx_buffer.N_bytes);

  return SRSRAN_SUCCESS;
}

int mac_ul_sch_pdu_unpack_and_pack_test3()
{
  // MAC PDU with UL-SCH (with normal LCID) subheader for short SDU
  // Bit 1-8
  // |   |   |   |   |   |   |   |   |
  // | R |F=0|         LCID          |  Octet 1
  // |                L              |  Octet 2

  // TV1 - MAC PDU with short subheader for CCCH, MAC SDU length is 8 B, total PDU is 10 B
  uint8_t mac_ul_sch_pdu_1[] = {0x02, 0x0a, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa};

  if (pcap_handle) {
    pcap_handle->write_ul_crnti_nr(mac_ul_sch_pdu_1, sizeof(mac_ul_sch_pdu_1), PCAP_CRNTI, true, PCAP_TTI);
  }

  srsran::mac_sch_pdu_nr pdu(true);
  pdu.unpack(mac_ul_sch_pdu_1, sizeof(mac_ul_sch_pdu_1));
  TESTASSERT(pdu.get_num_subpdus() == 1);

  mac_sch_subpdu_nr subpdu = pdu.get_subpdu(0);
  TESTASSERT(subpdu.get_total_length() == 12);
  TESTASSERT(subpdu.get_sdu_length() == 10);
  TESTASSERT(subpdu.get_lcid() == 2);

  // pack PDU again
  byte_buffer_t tx_buffer;

  srsran::mac_sch_pdu_nr tx_pdu;
  tx_pdu.init_tx(&tx_buffer, sizeof(mac_ul_sch_pdu_1), true);

  // Add SDU part of TV from above
  tx_pdu.add_sdu(2, &mac_ul_sch_pdu_1[2], 10);

  TESTASSERT(tx_pdu.get_remaing_len() == 0);
  TESTASSERT(tx_buffer.N_bytes == sizeof(mac_ul_sch_pdu_1));
  TESTASSERT(memcmp(tx_buffer.msg, mac_ul_sch_pdu_1, tx_buffer.N_bytes) == 0);

  if (pcap_handle) {
    pcap_handle->write_ul_crnti_nr(tx_buffer.msg, tx_buffer.N_bytes, PCAP_CRNTI, true, PCAP_TTI);
  }

  auto& mac_logger = srslog::fetch_basic_logger("MAC");
  mac_logger.info(tx_buffer.msg, tx_buffer.N_bytes, "Generated MAC PDU (%d B)", tx_buffer.N_bytes);

  return SRSRAN_SUCCESS;
}

int mac_ul_sch_pdu_pack_test4()
{
  // MAC PDU with UL-SCH (with normal LCID) subheader for long SDU
  // Bit 1-8
  // |   |   |   |   |   |   |   |   |
  // | R |F=1|         LCID          |  Octet 1
  // |                L              |  Octet 2
  // |                L              |  Octet 3

  uint8_t sdu[512] = {};

  // populate SDU payload
  for (uint32_t i = 0; i < 512; i++) {
    sdu[i] = i % 256;
  }

  // pack PDU again
  byte_buffer_t tx_buffer;

  srsran::mac_sch_pdu_nr tx_pdu;
  tx_pdu.init_tx(&tx_buffer, sizeof(sdu) + 3, true);

  // Add SDU part of TV from above
  tx_pdu.add_sdu(2, sdu, sizeof(sdu));

  TESTASSERT(tx_pdu.get_remaing_len() == 0);
  TESTASSERT(tx_buffer.N_bytes == sizeof(sdu) + 3);

  if (pcap_handle) {
    pcap_handle->write_ul_crnti_nr(tx_buffer.msg, tx_buffer.N_bytes, PCAP_CRNTI, true, PCAP_TTI);
  }

  auto& mac_logger = srslog::fetch_basic_logger("MAC");
  mac_logger.info(tx_buffer.msg, tx_buffer.N_bytes, "Generated MAC PDU (%d B)", tx_buffer.N_bytes);

  return SRSRAN_SUCCESS;
}

int mac_ul_sch_pdu_unpack_test5()
{
  // MAC PDU with UL-SCH (with normal LCID) subheader for short SDU but reserved LCID
  // Bit 1-8
  // |   |   |   |   |   |   |   |   |
  // | R |F=0|         LCID          |  Octet 1
  // |                L              |  Octet 2

  // TV1 - MAC PDU with short subheader but reserved LCID for UL-SCH (LCID=33)
  uint8_t mac_ul_sch_pdu_1[] = {0x21, 0x0a, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa};

  if (pcap_handle) {
    pcap_handle->write_ul_crnti_nr(mac_ul_sch_pdu_1, sizeof(mac_ul_sch_pdu_1), PCAP_CRNTI, true, PCAP_TTI);
  }

  srsran::mac_sch_pdu_nr pdu(true);
  pdu.unpack(mac_ul_sch_pdu_1, sizeof(mac_ul_sch_pdu_1));
  TESTASSERT(pdu.get_num_subpdus() == 0);

  return SRSRAN_SUCCESS;
}

int mac_dl_sch_pdu_unpack_and_pack_test6()
{
  // MAC PDU with UL-SCH: CRNTI, SE PHR, SBDR and padding

  // CRNTI:0x4601 SE PHR:ph=63 pc=52 SBSR: lcg=6 bs=0 PAD: len=0
  uint8_t tv[] = {0x3a, 0x46, 0x01, 0x39, 0x3f, 0x34, 0x3d, 0xc0, 0x3f};

  const uint16_t TV_CRNTI     = 0x4601;
  const uint8_t  TV_PHR       = 63;
  const uint8_t  TV_PC        = 52;
  const uint8_t  TV_LCG       = 6;
  const uint8_t  TV_BUFF_SIZE = 0;

  if (pcap_handle) {
    pcap_handle->write_ul_crnti_nr(tv, sizeof(tv), PCAP_CRNTI, true, PCAP_TTI);
  }

  // Unpack TV
  {
    srsran::mac_sch_pdu_nr pdu_rx(true);
    pdu_rx.unpack(tv, sizeof(tv));
    TESTASSERT(pdu_rx.get_num_subpdus() == 4);

    // 1st C-RNTI
    mac_sch_subpdu_nr subpdu = pdu_rx.get_subpdu(0);
    TESTASSERT(subpdu.get_total_length() == 3);
    TESTASSERT(subpdu.get_sdu_length() == 2);
    TESTASSERT(subpdu.get_lcid() == mac_sch_subpdu_nr::CRNTI);
    TESTASSERT(subpdu.get_c_rnti() == TV_CRNTI);

    // 2nd subPDU is SE PHR
    subpdu = pdu_rx.get_subpdu(1);
    TESTASSERT(subpdu.get_lcid() == mac_sch_subpdu_nr::SE_PHR);
    TESTASSERT(subpdu.get_phr() == TV_PHR);
    TESTASSERT(subpdu.get_pcmax() == TV_PC);

    // 3rd subPDU is SBSR
    subpdu = pdu_rx.get_subpdu(2);
    TESTASSERT(subpdu.get_lcid() == mac_sch_subpdu_nr::SHORT_BSR);
    mac_sch_subpdu_nr::lcg_bsr_t sbsr = subpdu.get_sbsr();
    TESTASSERT(sbsr.lcg_id == TV_LCG);
    TESTASSERT(sbsr.buffer_size == TV_BUFF_SIZE);

    // 4th is padding
    subpdu = pdu_rx.get_subpdu(3);
    TESTASSERT(subpdu.get_lcid() == mac_sch_subpdu_nr::PADDING);

    // pretty print PDU
    fmt::memory_buffer buff;
    pdu_rx.to_string(buff);

    auto& mac_logger = srslog::fetch_basic_logger("MAC");
    mac_logger.info("Rx PDU: %s", srsran::to_c_str(buff));
  }

  // Let's pack the entire PDU again
  {
    byte_buffer_t          tx_buffer;
    srsran::mac_sch_pdu_nr pdu_tx(true);

    pdu_tx.init_tx(&tx_buffer, sizeof(tv), true); // same size as TV

    TESTASSERT(pdu_tx.get_remaing_len() == 9);
    TESTASSERT(pdu_tx.add_crnti_ce(TV_CRNTI) == SRSRAN_SUCCESS);

    TESTASSERT(pdu_tx.get_remaing_len() == 6);
    TESTASSERT(pdu_tx.add_se_phr_ce(TV_PHR, TV_PC) == SRSRAN_SUCCESS);

    TESTASSERT(pdu_tx.get_remaing_len() == 3);
    mac_sch_subpdu_nr::lcg_bsr_t sbsr = {};
    sbsr.lcg_id                       = TV_LCG;
    sbsr.buffer_size                  = TV_BUFF_SIZE;
    TESTASSERT(pdu_tx.add_sbsr_ce(sbsr) == SRSRAN_SUCCESS);
    TESTASSERT(pdu_tx.get_remaing_len() == 1);

    // finish PDU packing
    pdu_tx.pack();

    // pretty print PDU
    fmt::memory_buffer buff;
    pdu_tx.to_string(buff);

    auto& mac_logger = srslog::fetch_basic_logger("MAC");
    mac_logger.info("Tx PDU: %s", srsran::to_c_str(buff));

    // compare PDUs
    TESTASSERT(tx_buffer.N_bytes == sizeof(tv));
    TESTASSERT(memcmp(tx_buffer.msg, tv, tx_buffer.N_bytes) == 0);

    if (pcap_handle) {
      pcap_handle->write_ul_crnti_nr(tx_buffer.msg, tx_buffer.N_bytes, PCAP_CRNTI, true, PCAP_TTI);
    }
  }

  return SRSRAN_SUCCESS;
}

int mac_ul_sch_pdu_unpack_test6()
{
  // Malformed MAC PDU
  uint8_t tv[] = {0x04, 0xe7, 0x00, 0x80, 0x04, 0x45, 0x00, 0x00, 0xe4, 0x4b, 0x9d, 0x40, 0x00, 0x40, 0x01, 0x69, 0x28,
                  0xc0, 0xa8, 0x02, 0x02, 0xc0, 0xa8, 0x02, 0x01, 0x08, 0x00, 0x3a, 0xbc, 0x65, 0x4a, 0x00, 0x01, 0x94,
                  0x85, 0x70, 0x60, 0x00, 0x00, 0x00, 0x00, 0xaa, 0x1b, 0x0e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x11,
                  0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22,
                  0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33,
                  0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44,
                  0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55,
                  0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
                  0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
                  0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88,
                  0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97};

  if (pcap_handle) {
    pcap_handle->write_ul_crnti_nr(tv, sizeof(tv), PCAP_CRNTI, true, PCAP_TTI);
  }

  srsran::mac_sch_pdu_nr pdu(true);
  TESTASSERT(pdu.unpack(tv, sizeof(tv)) == SRSRAN_ERROR);

  return SRSRAN_SUCCESS;
}

int main(int argc, char** argv)
{
#if PCAP
  pcap_handle = std::unique_ptr<srsran::mac_pcap>(new srsran::mac_pcap());
  pcap_handle->open("mac_nr_pdu_test.pcap");
#endif

  auto& mac_logger = srslog::fetch_basic_logger("MAC", false);
  mac_logger.set_level(srslog::basic_levels::debug);
  mac_logger.set_hex_dump_max_size(-1);

  srslog::init();

  if (mac_dl_sch_pdu_unpack_and_pack_test1()) {
    fprintf(stderr, "mac_dl_sch_pdu_unpack_and_pack_test1() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_dl_sch_pdu_unpack_test2()) {
    fprintf(stderr, "mac_dl_sch_pdu_unpack_test2() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_dl_sch_pdu_pack_test3()) {
    fprintf(stderr, "mac_dl_sch_pdu_pack_test3() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_dl_sch_pdu_pack_test4()) {
    fprintf(stderr, "mac_dl_sch_pdu_pack_test4() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_dl_sch_pdu_pack_test5()) {
    fprintf(stderr, "mac_dl_sch_pdu_pack_test5() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_dl_sch_pdu_unpack_test6()) {
    fprintf(stderr, "mac_dl_sch_pdu_unpack_test6() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_rar_pdu_test7()) {
    fprintf(stderr, "mac_rar_pdu_unpack_test7() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_rar_pdu_unpack_test8()) {
    fprintf(stderr, "mac_rar_pdu_unpack_test8() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_dl_sch_pdu_unpack_test9()) {
    fprintf(stderr, "mac_dl_sch_pdu_unpack_test9() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_ul_sch_pdu_unpack_test1()) {
    fprintf(stderr, "mac_ul_sch_pdu_unpack_test1() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_ul_sch_pdu_unpack_and_pack_test2()) {
    fprintf(stderr, "mac_ul_sch_pdu_unpack_and_pack_test2() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_ul_sch_pdu_unpack_and_pack_test3()) {
    fprintf(stderr, "mac_ul_sch_pdu_unpack_and_pack_test3() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_ul_sch_pdu_pack_test4()) {
    fprintf(stderr, "mac_ul_sch_pdu_pack_test4() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_ul_sch_pdu_unpack_test5()) {
    fprintf(stderr, "mac_ul_sch_pdu_unpack_test5() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_dl_sch_pdu_unpack_and_pack_test6()) {
    fprintf(stderr, "mac_dl_sch_pdu_unpack_and_pack_test6() failed.\n");
    return SRSRAN_ERROR;
  }

  if (mac_ul_sch_pdu_unpack_test6()) {
    fprintf(stderr, "mac_ul_sch_pdu_unpack_test6() failed.\n");
    return SRSRAN_ERROR;
  }

  if (pcap_handle) {
    pcap_handle->close();
  }

  srslog::flush();

  return SRSRAN_SUCCESS;
}