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lib,rlc_am_nr: fix segmented retx of non-contiguous segments

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master
Robert Falkenberg 3 years ago
parent 697781f024
commit 62558d94da
2 changed files with 277 additions and 16 deletions
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15
lib/src/rlc/rlc_am_nr.cc
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@ -645,21 +645,18 @@ uint32_t rlc_am_nr_tx::build_retx_pdu_with_segmentation(rlc_amd_retx_nr_t& retx,
}
if (it != tx_pdu.segment_list.end()) {
rlc_amd_tx_pdu_nr::pdu_segment seg1 = {};
seg1.so = retx.current_so;
seg1.so = it->so;
seg1.payload_len = retx_pdu_payload_size;
rlc_amd_tx_pdu_nr::pdu_segment seg2 = {};
seg2.so = retx.current_so + retx_pdu_payload_size;
seg2.payload_len = retx.segment_length - retx_pdu_payload_size;
seg2.so = it->so + retx_pdu_payload_size;
seg2.payload_len = it->payload_len - retx_pdu_payload_size;
std::list<rlc_amd_tx_pdu_nr::pdu_segment>::iterator begin_it = tx_pdu.segment_list.erase(it);
if (begin_it == tx_pdu.segment_list.end()) {
RlcError("Could not modify segment list. SN=%d, SO=%d len=%d", retx.sn, retx.current_so, retx.segment_length);
} else {
std::list<rlc_amd_tx_pdu_nr::pdu_segment>::iterator insert_it = tx_pdu.segment_list.insert(begin_it, seg1);
std::list<rlc_amd_tx_pdu_nr::pdu_segment>::iterator insert_it2 = tx_pdu.segment_list.insert(insert_it, seg2);
std::list<rlc_amd_tx_pdu_nr::pdu_segment>::iterator insert_it = tx_pdu.segment_list.insert(begin_it, seg2);
std::list<rlc_amd_tx_pdu_nr::pdu_segment>::iterator insert_it2 = tx_pdu.segment_list.insert(insert_it, seg1);
RlcDebug("Old segment SN=%d, SO=%d len=%d", retx.sn, retx.current_so, retx.segment_length);
RlcDebug("New segment SN=%d, SO=%d len=%d", retx.sn, seg1.so, seg1.payload_len);
RlcDebug("New segment SN=%d, SO=%d len=%d", retx.sn, seg2.so, seg2.payload_len);
}
} else {
RlcDebug("Could not find segment. SN=%d, SO=%d length=%d", retx.sn, retx.current_so, retx.segment_length);
}

264
lib/test/rlc/rlc_am_nr_test.cc
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@ -929,6 +929,269 @@ int segment_retx_test(rlc_am_nr_sn_size_t sn_size)
return SRSRAN_SUCCESS;
}
int segment_retx_and_loose_segments_test(rlc_am_nr_sn_size_t sn_size)
{
rlc_am_tester tester;
timer_handler timers(8);
byte_buffer_t pdu_bufs[NBUFS];
auto& test_logger = srslog::fetch_basic_logger("TESTER ");
rlc_am rlc1(srsran_rat_t::nr, srslog::fetch_basic_logger("RLC_AM_1"), 1, &tester, &tester, &timers);
rlc_am rlc2(srsran_rat_t::nr, srslog::fetch_basic_logger("RLC_AM_2"), 1, &tester, &tester, &timers);
test_delimit_logger delimiter("segment retx PDU and loose some segments (%d bit SN)", to_number(sn_size));
rlc_am_nr_tx* tx1 = dynamic_cast<rlc_am_nr_tx*>(rlc1.get_tx());
rlc_am_nr_rx* rx1 = dynamic_cast<rlc_am_nr_rx*>(rlc1.get_rx());
rlc_am_nr_tx* tx2 = dynamic_cast<rlc_am_nr_tx*>(rlc2.get_tx());
rlc_am_nr_rx* rx2 = dynamic_cast<rlc_am_nr_rx*>(rlc2.get_rx());
if (not rlc1.configure(rlc_config_t::default_rlc_am_nr_config(to_number(sn_size)))) {
return -1;
}
if (not rlc2.configure(rlc_config_t::default_rlc_am_nr_config(to_number(sn_size)))) {
return -1;
}
// after configuring entity
TESTASSERT_EQ(0, rlc1.get_buffer_state());
// Push 5 SDUs into RLC1
unique_byte_buffer_t sdu_bufs[NBUFS];
constexpr uint32_t payload_size = 3; // Give the SDU the size of 3 bytes
uint32_t header_size = sn_size == rlc_am_nr_sn_size_t::size12bits ? 2 : 3;
for (int i = 0; i < NBUFS; i++) {
sdu_bufs[i] = srsran::make_byte_buffer();
sdu_bufs[i]->msg[0] = i; // Write the index into the buffer
sdu_bufs[i]->N_bytes = payload_size; // Give each buffer a size of 3 bytes
sdu_bufs[i]->md.pdcp_sn = i; // PDCP SN for notifications
rlc1.write_sdu(std::move(sdu_bufs[i]));
}
uint32_t expected_buffer_state = (header_size + payload_size) * NBUFS;
TESTASSERT_EQ(expected_buffer_state, rlc1.get_buffer_state());
// Read 5 PDUs from RLC1 (1 byte each)
for (int i = 0; i < NBUFS; i++) {
uint32_t len = rlc1.read_pdu(pdu_bufs[i].msg, header_size + payload_size);
pdu_bufs[i].N_bytes = len;
TESTASSERT_EQ(header_size + payload_size, len);
}
TESTASSERT_EQ(0, rlc1.get_buffer_state());
// Write 5 - 1 PDUs into RLC2
for (int i = 0; i < NBUFS; i++) {
if (i != 3) {
rlc2.write_pdu(pdu_bufs[i].msg, pdu_bufs[i].N_bytes); // Don't write RLC_SN=3.
}
}
// Only after t-reassembly has expired, will the status report include NACKs.
TESTASSERT_EQ(3, rlc2.get_buffer_state());
{
// Read status PDU from RLC2
byte_buffer_t status_buf;
int len = rlc2.read_pdu(status_buf.msg, 5);
status_buf.N_bytes = len;
TESTASSERT_EQ(0, rlc2.get_buffer_state());
// Assert status is correct
rlc_am_nr_status_pdu_t status_check = {};
rlc_am_nr_read_status_pdu(&status_buf, sn_size, &status_check);
TESTASSERT_EQ(3, status_check.ack_sn); // 3 is the next expected SN (i.e. the lost packet.)
// Write status PDU to RLC1
rlc1.write_pdu(status_buf.msg, status_buf.N_bytes);
}
// Step timers until reassambly timeout expires
for (int cnt = 0; cnt < 35; cnt++) {
timers.step_all();
}
// t-reassembly has expired. There should be a NACK in the status report.
constexpr uint32_t status_pdu_ack_size = 3;
uint32_t status_pdu_nack_size = sn_size == rlc_am_nr_sn_size_t::size12bits ? 2 : 3;
TESTASSERT_EQ(status_pdu_ack_size + status_pdu_nack_size, rlc2.get_buffer_state());
{
// Read status PDU from RLC2
byte_buffer_t status_buf;
int len = rlc2.read_pdu(status_buf.msg, status_pdu_ack_size + status_pdu_nack_size);
status_buf.N_bytes = len;
TESTASSERT_EQ(0, rlc2.get_buffer_state());
// Assert status is correct
rlc_am_nr_status_pdu_t status_check = {};
rlc_am_nr_read_status_pdu(&status_buf, sn_size, &status_check);
TESTASSERT_EQ(5, status_check.ack_sn); // 5 is the next expected SN.
TESTASSERT_EQ(1, status_check.nacks.size()); // We lost one PDU.
TESTASSERT_EQ(3, status_check.nacks[0].nack_sn); // Lost PDU SN=3.
// Write status PDU to RLC1
rlc1.write_pdu(status_buf.msg, status_buf.N_bytes);
// Check there is an Retx of SN=3
TESTASSERT_EQ(header_size + payload_size, rlc1.get_buffer_state());
}
constexpr uint32_t so_size = 2;
constexpr uint32_t segment_size = 1;
uint32_t pdu_size_first = header_size + segment_size;
uint32_t pdu_size_continued = header_size + so_size + segment_size;
{
// Re-transmit PDU in 3 segments
for (int i = 0; i < 3; i++) {
byte_buffer_t retx_buf;
uint32_t len = 0;
if (i == 0) {
len = rlc1.read_pdu(retx_buf.msg, pdu_size_first);
TESTASSERT_EQ(pdu_size_first, len);
} else {
len = rlc1.read_pdu(retx_buf.msg, pdu_size_continued);
TESTASSERT_EQ(pdu_size_continued, len);
}
retx_buf.N_bytes = len;
rlc_am_nr_pdu_header_t header_check = {};
uint32_t hdr_len = rlc_am_nr_read_data_pdu_header(&retx_buf, sn_size, &header_check);
// Double check header.
TESTASSERT_EQ(3, header_check.sn); // Double check RETX SN
if (i == 0) {
TESTASSERT_EQ(rlc_nr_si_field_t::first_segment, header_check.si);
} else if (i == 1) {
TESTASSERT_EQ(rlc_nr_si_field_t::neither_first_nor_last_segment, header_check.si);
} else {
TESTASSERT_EQ(rlc_nr_si_field_t::last_segment, header_check.si);
}
// We loose the first and the last segment
if (i != 0 && i != 2) {
rlc2.write_pdu(retx_buf.msg, retx_buf.N_bytes);
}
}
TESTASSERT(0 == rlc1.get_buffer_state());
}
// Step timers until reassambly timeout expires
for (int cnt = 0; cnt < 35; cnt++) {
timers.step_all();
}
// t-reassembly has expired. There should be another NACK in the status report.
// constexpr uint32_t status_pdu_ack_size = 3;
// uint32_t status_pdu_nack_size = sn_size == rlc_am_nr_sn_size_t::size12bits ? 2 : 3;
constexpr uint32_t status_pdu_so_size = 4;
TESTASSERT_EQ(status_pdu_ack_size + 2 * status_pdu_nack_size + 2 * status_pdu_so_size, rlc2.get_buffer_state());
{
// Read status PDU from RLC2
byte_buffer_t status_buf;
int len = rlc2.read_pdu(status_buf.msg, status_pdu_ack_size + 2 * status_pdu_nack_size + 2 * status_pdu_so_size);
status_buf.N_bytes = len;
TESTASSERT_EQ(0, rlc2.get_buffer_state());
// Assert status is correct
rlc_am_nr_status_pdu_t status_check = {};
rlc_am_nr_read_status_pdu(&status_buf, sn_size, &status_check);
TESTASSERT_EQ(5, status_check.ack_sn); // 5 is the next expected SN.
TESTASSERT_EQ(2, status_check.nacks.size()); // We lost two PDU segments.
TESTASSERT_EQ(3, status_check.nacks[0].nack_sn); // Lost PDU SN=3.
TESTASSERT_EQ(true, status_check.nacks[0].has_so); // This is a segment missing.
TESTASSERT_EQ(0, status_check.nacks[0].so_start); // Segment offset should be 0 here
TESTASSERT_EQ(0, status_check.nacks[0].so_end); // Segment end should be 0 here
TESTASSERT_EQ(true, status_check.nacks[1].has_so); // This is a segment missing.
TESTASSERT_EQ(2, status_check.nacks[1].so_start); // Segment offset should be 2 here
TESTASSERT_EQ(0xFFFF, status_check.nacks[1].so_end); // Segment end should be 0xFFFF here
// Write status PDU to RLC1
rlc1.write_pdu(status_buf.msg, status_buf.N_bytes);
// Write status PDU duplicate to RLC1
// rlc1.write_pdu(status_buf.msg, status_buf.N_bytes);
// Check there are two Retx segments
TESTASSERT_EQ(header_size + payload_size, rlc1.get_buffer_state()); // Fixme: get_buffer_state()
}
{
// Re-transmit the lost 2 segments
for (int i = 0; i < 2; i++) {
byte_buffer_t retx_buf;
uint32_t len = 0;
if (i == 0) {
len = rlc1.read_pdu(retx_buf.msg, pdu_size_first);
TESTASSERT_EQ(pdu_size_first, len);
} else {
len = rlc1.read_pdu(retx_buf.msg, pdu_size_continued);
TESTASSERT_EQ(pdu_size_continued, len);
}
retx_buf.N_bytes = len;
rlc_am_nr_pdu_header_t header_check = {};
uint32_t hdr_len = rlc_am_nr_read_data_pdu_header(&retx_buf, sn_size, &header_check);
// Double check header.
TESTASSERT_EQ(3, header_check.sn); // Double check RETX SN
if (i == 0) {
TESTASSERT_EQ(rlc_nr_si_field_t::first_segment, header_check.si);
} else {
TESTASSERT_EQ(rlc_nr_si_field_t::last_segment, header_check.si);
}
rlc2.write_pdu(retx_buf.msg, retx_buf.N_bytes);
}
TESTASSERT(0 == rlc1.get_buffer_state());
}
// Check statistics
rlc_bearer_metrics_t metrics1 = rlc1.get_metrics();
rlc_bearer_metrics_t metrics2 = rlc2.get_metrics();
uint32_t data_pdu_size = header_size + payload_size;
uint32_t total_tx_pdu_bytes1 = NBUFS * data_pdu_size + 2 * pdu_size_first + 3 * pdu_size_continued;
uint32_t total_rx_pdu_bytes1 = status_pdu_ack_size + // ACK, no NACK
(status_pdu_ack_size + status_pdu_nack_size) + // ACK + NACK full SDU
(status_pdu_ack_size + 2 * status_pdu_nack_size + // ACK + NACK two segments
2 * status_pdu_so_size);
uint32_t total_tx_pdu_bytes2 = total_rx_pdu_bytes1;
uint32_t total_rx_pdu_bytes2 = (NBUFS - 1) * data_pdu_size + pdu_size_first + 2 * pdu_size_continued;
// SDU metrics
TESTASSERT_EQ(5, metrics1.num_tx_sdus);
TESTASSERT_EQ(0, metrics1.num_rx_sdus);
TESTASSERT_EQ(15, metrics1.num_tx_sdu_bytes);
TESTASSERT_EQ(0, metrics1.num_rx_sdu_bytes);
TESTASSERT_EQ(0, metrics1.num_lost_sdus);
// PDU metrics
TESTASSERT_EQ(5 + 3 + 2, metrics1.num_tx_pdus); // 5 + (3 + 2) re-transmissions
TESTASSERT_EQ(3, metrics1.num_rx_pdus); // 3 status PDU
TESTASSERT_EQ(total_tx_pdu_bytes1, metrics1.num_tx_pdu_bytes);
TESTASSERT_EQ(total_rx_pdu_bytes1, metrics1.num_rx_pdu_bytes);
TESTASSERT_EQ(0, metrics1.num_lost_sdus); // No lost SDUs
// PDU metrics
TESTASSERT_EQ(0, metrics2.num_tx_sdus);
TESTASSERT_EQ(5, metrics2.num_rx_sdus);
TESTASSERT_EQ(0, metrics2.num_tx_sdu_bytes);
TESTASSERT_EQ(15, metrics2.num_rx_sdu_bytes); // 5 SDUs, 3 bytes each
TESTASSERT_EQ(0, metrics2.num_lost_sdus);
// SDU metrics
TESTASSERT_EQ(3, metrics2.num_tx_pdus); // 3 status PDUs
TESTASSERT_EQ(7, metrics2.num_rx_pdus); // 7 PDUs (10 tx'ed, but 3 were lost)
TESTASSERT_EQ(total_tx_pdu_bytes2, metrics2.num_tx_pdu_bytes);
TESTASSERT_EQ(total_rx_pdu_bytes2,
metrics2.num_rx_pdu_bytes); // 2 Bytes * (NBUFFS-1) (header size) + (NBUFFS-1) * 3 (data)
// 3 (1 retx no SO) + 2 * 5 (2 retx with SO) = 33
TESTASSERT_EQ(0, metrics2.num_lost_sdus); // No lost SDUs
// Check state
rlc_am_nr_rx_state_t state2_rx = rx2->get_rx_state();
TESTASSERT_EQ(5, state2_rx.rx_next);
return SRSRAN_SUCCESS;
}
int retx_segment_test(rlc_am_nr_sn_size_t sn_size)
{
rlc_am_tester tester;
@ -1785,6 +2048,7 @@ int main()
TESTASSERT(lost_pdu_duplicated_nack_test(sn_size) == SRSRAN_SUCCESS);
TESTASSERT(basic_segmentation_test(sn_size) == SRSRAN_SUCCESS);
TESTASSERT(segment_retx_test(sn_size) == SRSRAN_SUCCESS);
TESTASSERT(segment_retx_and_loose_segments_test(sn_size) == SRSRAN_SUCCESS);
TESTASSERT(retx_segment_test(sn_size) == SRSRAN_SUCCESS);
TESTASSERT(max_retx_lost_sdu_test(sn_size) == SRSRAN_SUCCESS);
TESTASSERT(max_retx_lost_segments_test(sn_size) == SRSRAN_SUCCESS);

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