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lib,rlc_am_nr: make sure we check that ACK_SN is not larger than TX_NEXT (after we checked we didn't get an ACK out of order)

This commit is contained in:
Pedro Alvarez 2022-05-09 16:52:50 +01:00
parent 97b66dbc4c
commit ae8191c46d
2 changed files with 19 additions and 17 deletions
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32
lib/src/rlc/rlc_am_nr.cc
View File

@ -773,15 +773,10 @@ void rlc_am_nr_tx::handle_control_pdu(uint8_t* payload, uint32_t nof_bytes)
log_rlc_am_nr_status_pdu_to_string(logger.info, "RX status PDU: %s", &status, parent->rb_name);
/*
* - if the SN of the corresponding RLC SDU falls within the range
* TX_Next_Ack <= SN < = the highest SN of the AMD PDU among the AMD PDUs submitted to lower layer:
* - consider the RLC SDU or the RLC SDU segment for which a negative acknowledgement was received for
* retransmission.
* Sanity check the received status report.
* Checking if the ACK_SN is inside the the TX_WINDOW makes sure we discard out of order status reports
* Checking if ACK_SN > Tx_Next makes sure we do not receive a ACK/NACK for something we did not TX
*/
uint32_t stop_sn = status.nacks.size() == 0
? status.ack_sn
: status.nacks[0].nack_sn; // Stop processing ACKs at the first NACK, if it exists.
if (not inside_tx_window(status.ack_sn)) {
RlcInfo("Received ACK with SN outside of TX_WINDOW, ignoring status report. ACK_SN=%d, TX_NEXT_ACK=%d.",
status.ack_sn,
@ -789,12 +784,11 @@ void rlc_am_nr_tx::handle_control_pdu(uint8_t* payload, uint32_t nof_bytes)
info_state();
return;
}
if (tx_mod_base_nr(stop_sn) > tx_mod_base_nr(st.tx_next)) {
RlcWarning(
"Received ACK or NACK with SN larger than TX_NEXT, ignoring status report. SN=%d, TX_NEXT_ACK=%d, TX_NEXT=%d",
stop_sn,
st.tx_next_ack,
st.tx_next);
if (tx_mod_base_nr(status.ack_sn) > tx_mod_base_nr(st.tx_next)) {
RlcWarning("Received ACK with SN larger than TX_NEXT, ignoring status report. SN=%d, TX_NEXT_ACK=%d, TX_NEXT=%d",
status.ack_sn,
st.tx_next_ack,
st.tx_next);
info_state();
return;
}
@ -805,7 +799,6 @@ void rlc_am_nr_tx::handle_control_pdu(uint8_t* payload, uint32_t nof_bytes)
* number equal to POLL_SN:
* - if t-PollRetransmit is running:
* - stop and reset t-PollRetransmit.
*
*/
if (tx_mod_base_nr(st.poll_sn) <= tx_mod_base_nr(status.ack_sn)) {
if (poll_retransmit_timer.is_running()) {
@ -818,7 +811,16 @@ void rlc_am_nr_tx::handle_control_pdu(uint8_t* payload, uint32_t nof_bytes)
RlcDebug("POLL_SN=%d > ACK_SN=%d. Not stopping t-PollRetransmit ", st.poll_sn, status.ack_sn);
}
/*
* - if the SN of the corresponding RLC SDU falls within the range
* TX_Next_Ack <= SN < = the highest SN of the AMD PDU among the AMD PDUs submitted to lower layer:
* - consider the RLC SDU or the RLC SDU segment for which a negative acknowledgement was received for
* retransmission.
*/
// Process ACKs
uint32_t stop_sn = status.nacks.size() == 0
? status.ack_sn
: status.nacks[0].nack_sn; // Stop processing ACKs at the first NACK, if it exists.
for (uint32_t sn = st.tx_next_ack; tx_mod_base_nr(sn) < tx_mod_base_nr(stop_sn); sn = (sn + 1) % mod_nr) {
if (tx_window->has_sn(sn)) {
notify_info_vec.push_back((*tx_window)[sn].pdcp_sn);

4
lib/test/rlc/rlc_am_nr_test.cc
View File

@ -2726,7 +2726,7 @@ int rx_nack_range_no_so_test(rlc_am_nr_sn_size_t sn_size)
// Deliver dummy status report with nack range betwen PDU 6 and 10.
rlc_am_nr_status_pdu_t status(sn_size);
status.ack_sn = 16;
status.ack_sn = 5;
rlc_status_nack_t nack = {};
nack.nack_sn = 1;
nack.has_nack_range = true;
@ -2818,7 +2818,7 @@ int rx_nack_range_with_so_test(rlc_am_nr_sn_size_t sn_size)
// Deliver dummy status report with nack range betwen PDU 6 and 10.
rlc_am_nr_status_pdu_t status(sn_size);
status.ack_sn = 16;
status.ack_sn = 5;
rlc_status_nack_t nack = {};
nack.nack_sn = 1;