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@ -185,6 +185,10 @@ uint32_t rlc_am_nr_tx::read_pdu(uint8_t* payload, uint32_t nof_bytes)
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*/
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uint32_t rlc_am_nr_tx::build_new_pdu(uint8_t* payload, uint32_t nof_bytes)
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{
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if (nof_bytes <= min_hdr_size) {
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RlcInfo("Not enough bytes for payload plus header. nof_bytes=%d", nof_bytes);
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return 0;
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}
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// Read new SDU from TX queue
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unique_byte_buffer_t tx_sdu;
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RlcDebug("Reading from RLC SDU queue. Queue size %d", tx_sdu_queue.size());
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@ -449,12 +453,12 @@ uint32_t rlc_am_nr_tx::build_retx_pdu(uint8_t* payload, uint32_t nof_bytes)
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// Sanity check - drop any retx SNs not present in tx_window
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while (not tx_window->has_sn(retx.sn)) {
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RlcWarning("SN=%d not in tx window. Ignoring retx.", retx.sn);
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RlcInfo("SN=%d not in tx window, probably already ACKed. Skip and remove from retx queue", retx.sn);
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retx_queue->pop();
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if (!retx_queue->empty()) {
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retx = retx_queue->front();
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} else {
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RlcWarning("empty retx queue, cannot provide retx PDU");
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RlcInfo("empty retx queue, cannot provide any retx PDU");
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return 0;
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}
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}
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@ -833,7 +837,7 @@ void rlc_am_nr_tx::handle_control_pdu(uint8_t* payload, uint32_t nof_bytes)
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std::set<uint32_t> retx_sn_set; // Set of PDU SNs added for retransmission (no duplicates)
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for (uint32_t nack_idx = 0; nack_idx < status.nacks.size(); nack_idx++) {
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if (status.nacks[nack_idx].has_nack_range) {
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RlcError("Handling NACK ranges is not yet implemented. Ignoring NACK across %d SDU(s) starting from SN=%d",
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RlcWarning("Handling NACK ranges is not yet implemented. Ignoring NACK across %d SDU(s) starting from SN=%d",
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status.nacks[nack_idx].nack_range,
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status.nacks[nack_idx].nack_sn);
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continue;
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@ -1159,11 +1163,6 @@ void rlc_am_nr_tx::reestablish()
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stop();
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}
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bool rlc_am_nr_tx::sdu_queue_is_full()
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{
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return false;
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}
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void rlc_am_nr_tx::empty_queue()
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{
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std::lock_guard<std::mutex> lock(mutex);
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@ -1234,6 +1233,11 @@ void rlc_am_nr_tx::timer_expired(uint32_t timeout_id)
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retx.current_so = 0;
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retx.segment_length = (*tx_window)[st.tx_next_ack].segment_list.begin()->payload_len;
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}
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RlcDebug("Retransmission because of t-PollRetransmit. RETX SN=%d, is_segment=%s, so_start=%d, segment_length=%d",
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retx.sn,
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retx.is_segment ? "true" : "false",
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retx.so_start,
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retx.segment_length);
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}
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return;
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}
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@ -1356,12 +1360,44 @@ void rlc_am_nr_rx::handle_data_pdu(uint8_t* payload, uint32_t nof_bytes)
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return;
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}
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// Trigger polling if poll bit is set.
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// We do this before discarding duplicate SDUs/SDU segments
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// Because t-PollRetransmit may transmit a PDU that was already
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// received.
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if (header.p) {
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RlcInfo("status packet requested through polling bit");
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do_status = true;
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}
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// Section 5.2.3.2.2, discard duplicate PDUs
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if (rx_window->has_sn(header.sn) && (*rx_window)[header.sn].fully_received) {
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RlcInfo("discarding duplicate SN=%d", header.sn);
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return;
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}
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// Section 5.2.3.2.2, discard segments with overlapping bytes
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if (rx_window->has_sn(header.sn) && header.si != rlc_nr_si_field_t::full_sdu) {
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for (const auto& segm : (*rx_window)[header.sn].segments) {
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uint32_t segm_last_byte = segm.header.so + segm.buf->N_bytes - 1;
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uint32_t pdu_last_byte = header.so + nof_bytes - hdr_len - 1;
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if ((header.so >= segm.header.so && header.so <= segm_last_byte) ||
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(pdu_last_byte >= segm.header.so && pdu_last_byte <= segm_last_byte)) {
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RlcInfo("Got SDU segment with duplicate bytes. Discarding.");
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RlcInfo("Discarded SDU segment. SN=%d, SO=%d, last_byte=%d, payload=%d",
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header.sn,
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header.so,
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header.so + (nof_bytes - hdr_len),
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(nof_bytes - hdr_len));
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RlcInfo("Overlaping with SDU segment with SN=%d, SO=%d, last_byte=%d, payload=%d",
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header.sn,
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segm.header.so,
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segm_last_byte,
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segm.buf->N_bytes);
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return;
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}
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}
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}
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// Write to rx window either full SDU or SDU segment
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if (header.si == rlc_nr_si_field_t::full_sdu) {
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int err = handle_full_data_sdu(header, payload, nof_bytes);
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@ -1375,12 +1411,6 @@ void rlc_am_nr_rx::handle_data_pdu(uint8_t* payload, uint32_t nof_bytes)
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}
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}
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// Check poll bit
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if (header.p) {
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RlcInfo("status packet requested through polling bit");
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do_status = true;
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}
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debug_state();
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// 5.2.3.2.3 Actions when an AMD PDU is placed in the reception buffer
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@ -1632,11 +1662,30 @@ uint32_t rlc_am_nr_rx::get_status_pdu(rlc_am_nr_status_pdu_t* status, uint32_t m
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nack.so_start = last_so;
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nack.so_end = segm->header.so - 1; // set to last missing byte
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status->push_nack(nack);
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if (nack.so_start > nack.so_end) {
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// Print segment list
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for (auto segm_it = (*rx_window)[i].segments.begin(); segm_it != (*rx_window)[i].segments.end();
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segm_it++) {
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RlcError("Segment: segm.header.so=%d, segm.buf.N_bytes=%d", segm_it->header.so, segm_it->buf->N_bytes);
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}
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RlcError("Error: SO_start=%d > SO_end=%d. NACK_SN=%d. SO_start=%d, SO_end=%d, seg.so=%d",
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nack.so_start,
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nack.so_end,
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nack.nack_sn,
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nack.so_start,
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nack.so_end,
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segm->header.so);
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srsran_assert(nack.so_start <= nack.so_end,
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"Error: SO_start=%d > SO_end=%d. NACK_SN=%d",
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nack.so_start,
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nack.so_end,
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nack.nack_sn);
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} else {
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RlcDebug("First/middle segment missing. NACK_SN=%d. SO_start=%d, SO_end=%d",
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nack.nack_sn,
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nack.so_start,
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nack.so_end);
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srsran_assert(nack.so_start <= nack.so_end, "Error: SO_start > SO_end. NACK_SN=%d", nack.nack_sn);
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}
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}
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if (segm->header.si == rlc_nr_si_field_t::last_segment) {
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last_segment_rx = true;
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Codebot
3 years ago
committed by
SRS codebot