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srsLTE
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rlc,fix - Add PDCP PDUs to undelivered_sdu_info_queue when the PDUs are popped from the tx_sdu_queue, rather than they are pushed to. 

- This simplifies the sdu discard
- This also fixes an existing race condition
This commit is contained in:
Francisco 2021-04-29 11:59:55 +01:00 committed by Andre Puschmann
parent 526a076906
commit ad1a0eb2ac
1 changed files with 17 additions and 26 deletions
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43
lib/src/upper/rlc_am_lte.cc
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@ -361,6 +361,9 @@ void rlc_am_lte::rlc_am_lte_tx::empty_queue()
}
// deallocate SDU that is currently processed
if (tx_sdu != nullptr) {
undelivered_sdu_info_queue.clear_pdcp_sdu(tx_sdu->md.pdcp_sn);
}
tx_sdu.reset();
}
@ -504,15 +507,6 @@ int rlc_am_lte::rlc_am_lte_tx::write_sdu(unique_byte_buffer_t sdu)
return SRSRAN_ERROR;
}
if (undelivered_sdu_info_queue.has_pdcp_sn(sdu_pdcp_sn)) {
logger.warning("PDCP_SN=%d already marked as undelivered", sdu_pdcp_sn);
return SRSRAN_ERROR;
}
// Store SDU info
logger.debug("Marking PDCP_SN=%d as undelivered (queue_len=%ld)", sdu_pdcp_sn, undelivered_sdu_info_queue.nof_sdus());
undelivered_sdu_info_queue.add_pdcp_sdu(sdu_pdcp_sn);
return SRSRAN_SUCCESS;
}
@ -532,13 +526,6 @@ void rlc_am_lte::rlc_am_lte_tx::discard_sdu(uint32_t discard_sn)
// Discard fails when the PDCP PDU is already in Tx window.
logger.info("%s PDU with PDCP_SN=%d", discarded ? "Discarding" : "Couldn't discard", discard_sn);
// always try remove from undelivered SDUs queue
if (not undelivered_sdu_info_queue.has_pdcp_sn(discard_sn)) {
logger.info("PDCP SDU info does not exists for discarded SDU. PDCP_SN=%d", discard_sn);
} else {
undelivered_sdu_info_queue.clear_pdcp_sdu(discard_sn);
}
}
bool rlc_am_lte::rlc_am_lte_tx::sdu_queue_is_full()
@ -1075,7 +1062,6 @@ int rlc_am_lte::rlc_am_lte_tx::build_data_pdu(uint8_t* payload, uint32_t nof_byt
do {
tx_sdu = tx_sdu_queue.read();
} while (tx_sdu == nullptr && tx_sdu_queue.size() != 0);
if (tx_sdu == nullptr) {
if (header.N_li > 0) {
header.N_li--;
@ -1083,6 +1069,17 @@ int rlc_am_lte::rlc_am_lte_tx::build_data_pdu(uint8_t* payload, uint32_t nof_byt
break;
}
// store sdu info
if (undelivered_sdu_info_queue.has_pdcp_sn(tx_sdu->md.pdcp_sn)) {
logger.warning("PDCP_SN=%d already marked as undelivered", tx_sdu->md.pdcp_sn);
} else {
logger.debug("marking pdcp_sn=%d as undelivered (queue_len=%ld)",
tx_sdu->md.pdcp_sn,
undelivered_sdu_info_queue.nof_sdus());
undelivered_sdu_info_queue.add_pdcp_sdu(tx_sdu->md.pdcp_sn);
}
pdcp_pdu_info& pdcp_pdu = undelivered_sdu_info_queue[tx_sdu->md.pdcp_sn];
to_move = ((pdu_space - head_len) >= tx_sdu->N_bytes) ? tx_sdu->N_bytes : pdu_space - head_len;
memcpy(pdu_ptr, tx_sdu->msg, to_move);
last_li = to_move;
@ -1090,15 +1087,9 @@ int rlc_am_lte::rlc_am_lte_tx::build_data_pdu(uint8_t* payload, uint32_t nof_byt
pdu->N_bytes += to_move;
tx_sdu->N_bytes -= to_move;
tx_sdu->msg += to_move;
if (undelivered_sdu_info_queue.has_pdcp_sn(tx_sdu->md.pdcp_sn)) {
pdcp_pdu_info& pdcp_pdu = undelivered_sdu_info_queue[tx_sdu->md.pdcp_sn];
segment_pool.make_segment(tx_pdu, pdcp_pdu);
if (tx_sdu->N_bytes == 0) {
pdcp_pdu.fully_txed = true;
}
} else {
// PDCP SNs for the RLC SDU has been removed from the queue
logger.warning("Couldn't find PDCP_SN=%d in SDU info queue.", tx_sdu->md.pdcp_sn);
segment_pool.make_segment(tx_pdu, pdcp_pdu);
if (tx_sdu->N_bytes == 0) {
pdcp_pdu.fully_txed = true;
}
if (tx_sdu->N_bytes == 0) {