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@ -341,6 +341,135 @@ int lost_pdu_test()
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return SRSRAN_SUCCESS;
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}
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/*
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* Test the loss of a single PDU.
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* NACK should be visible in the status report.
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* Retx after NACK should be present too.
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*/
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int basic_segmentation_test()
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{
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rlc_am_tester tester;
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timer_handler timers(8);
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byte_buffer_t pdu_bufs[NBUFS];
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auto& test_logger = srslog::fetch_basic_logger("TESTER ");
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test_logger.info("=======================");
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test_logger.info("==== Lost PDU Test ====");
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test_logger.info("=======================");
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rlc_am rlc1(srsran_rat_t::nr, srslog::fetch_basic_logger("RLC_AM_1"), 1, &tester, &tester, &timers);
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rlc_am rlc2(srsran_rat_t::nr, srslog::fetch_basic_logger("RLC_AM_2"), 1, &tester, &tester, &timers);
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// before configuring entity
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TESTASSERT(0 == rlc1.get_buffer_state());
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if (not rlc1.configure(rlc_config_t::default_rlc_am_nr_config())) {
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return -1;
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}
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if (not rlc2.configure(rlc_config_t::default_rlc_am_nr_config())) {
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return -1;
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}
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basic_test_tx(&rlc1, pdu_bufs);
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// Write 5 PDUs into RLC2
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for (int i = 0; i < NBUFS; i++) {
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if (i != 3) {
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rlc2.write_pdu(pdu_bufs[i].msg, pdu_bufs[i].N_bytes); // Don't write RLC_SN=3.
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}
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}
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// Only after t-reassembly has expired, will the status report include NACKs.
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TESTASSERT(3 == rlc2.get_buffer_state());
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{
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// Read status PDU from RLC2
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byte_buffer_t status_buf;
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int len = rlc2.read_pdu(status_buf.msg, 5);
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status_buf.N_bytes = len;
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TESTASSERT(0 == rlc2.get_buffer_state());
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// Assert status is correct
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rlc_am_nr_status_pdu_t status_check = {};
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rlc_am_nr_read_status_pdu(&status_buf, rlc_am_nr_sn_size_t::size12bits, &status_check);
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TESTASSERT(status_check.ack_sn == 3); // 3 is the next expected SN (i.e. the lost packet.)
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// Write status PDU to RLC1
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rlc1.write_pdu(status_buf.msg, status_buf.N_bytes);
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}
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// Step timers until reassambly timeout expires
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for (int cnt = 0; cnt < 35; cnt++) {
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timers.step_all();
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}
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// t-reassembly has expired. There should be a NACK in the status report.
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TESTASSERT(5 == rlc2.get_buffer_state());
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{
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// Read status PDU from RLC2
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byte_buffer_t status_buf;
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int len = rlc2.read_pdu(status_buf.msg, 5);
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status_buf.N_bytes = len;
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TESTASSERT(0 == rlc2.get_buffer_state());
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// Assert status is correct
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rlc_am_nr_status_pdu_t status_check = {};
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rlc_am_nr_read_status_pdu(&status_buf, rlc_am_nr_sn_size_t::size12bits, &status_check);
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TESTASSERT(status_check.ack_sn == 5); // 5 is the next expected SN.
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TESTASSERT(status_check.N_nack == 1); // We lost one PDU.
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TESTASSERT(status_check.nacks[0].nack_sn == 3); // Lost PDU SN=3.
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// Write status PDU to RLC1
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rlc1.write_pdu(status_buf.msg, status_buf.N_bytes);
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// Check there is an Retx of SN=3
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TESTASSERT(3 == rlc1.get_buffer_state());
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}
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{
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// Check correct re-transmission
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byte_buffer_t retx_buf;
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int len = rlc1.read_pdu(retx_buf.msg, 3);
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retx_buf.N_bytes = len;
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TESTASSERT(3 == len);
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rlc2.write_pdu(retx_buf.msg, retx_buf.N_bytes);
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TESTASSERT(0 == rlc2.get_buffer_state());
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}
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// Check statistics
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rlc_bearer_metrics_t metrics1 = rlc1.get_metrics();
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rlc_bearer_metrics_t metrics2 = rlc2.get_metrics();
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// SDU metrics
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TESTASSERT_EQ(5, metrics1.num_tx_sdus);
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TESTASSERT_EQ(0, metrics1.num_rx_sdus);
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TESTASSERT_EQ(5, metrics1.num_tx_sdu_bytes);
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TESTASSERT_EQ(0, metrics1.num_rx_sdu_bytes);
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TESTASSERT_EQ(0, metrics1.num_lost_sdus);
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// PDU metrics
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TESTASSERT_EQ(5 + 1, metrics1.num_tx_pdus); // One re-transmission
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TESTASSERT_EQ(2, metrics1.num_rx_pdus); // One status PDU
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TESTASSERT_EQ(18, metrics1.num_tx_pdu_bytes); // 2 Bytes * NBUFFS (header size) + NBUFFS (data) + 1 rext (3) = 18
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TESTASSERT_EQ(3 + 5, metrics1.num_rx_pdu_bytes); // Two status PDU (one with a NACK)
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TESTASSERT_EQ(0, metrics1.num_lost_sdus); // No lost SDUs
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// PDU metrics
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TESTASSERT_EQ(0, metrics2.num_tx_sdus);
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TESTASSERT_EQ(5, metrics2.num_rx_sdus);
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TESTASSERT_EQ(0, metrics2.num_tx_sdu_bytes);
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TESTASSERT_EQ(5, metrics2.num_rx_sdu_bytes);
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TESTASSERT_EQ(0, metrics2.num_lost_sdus);
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// SDU metrics
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TESTASSERT_EQ(2, metrics2.num_tx_pdus); // Two status PDUs
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TESTASSERT_EQ(5, metrics2.num_rx_pdus); // 5 PDUs (6 tx'ed, but one was lost)
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TESTASSERT_EQ(5 + 3, metrics2.num_tx_pdu_bytes); // Two status PDU (one with a NACK)
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TESTASSERT_EQ(15, metrics2.num_rx_pdu_bytes); // 2 Bytes * NBUFFS (header size) + NBUFFS (data) = 15
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TESTASSERT_EQ(0, metrics2.num_lost_sdus); // No lost SDUs
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return SRSRAN_SUCCESS;
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}
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int main(int argc, char** argv)
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{
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// Setup the log message spy to intercept error and warning log entries from RLC
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