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lib,rlc_am_nr: added test for polling bit set when retx queue is empty. Fixed lost PDU test now that we correctly set the polling bit.

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master
Pedro Alvarez 3 years ago
parent 47aea19bd3
commit b4814bfdc1
3 changed files with 36 additions and 18 deletions
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2
lib/include/srsran/rlc/rlc_am_data_structs.h
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@ -203,6 +203,7 @@ struct rlc_ringbuffer_base {
virtual T& operator[](size_t sn) = 0;
virtual size_t size() const = 0;
virtual bool empty() const = 0;
virtual bool full() const = 0;
virtual void clear() = 0;
virtual bool has_sn(uint32_t sn) const = 0;
};
@ -224,6 +225,7 @@ struct rlc_ringbuffer_t : public rlc_ringbuffer_base<T> {
}
T& operator[](size_t sn) override { return window[sn]; }
size_t size() const override { return window.size(); }
bool full() const override { return window.full(); }
bool empty() const override { return window.empty(); }
void clear() override { window.clear(); }

19
lib/src/rlc/rlc_am_nr.cc
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@ -493,6 +493,7 @@ rlc_am_nr_tx::build_retx_pdu_without_segmentation(rlc_amd_retx_nr_t& retx, uint8
retx.segment_length);
// Update & write header
uint32_t retx_sn = retx.sn;
uint32_t current_so = 0;
rlc_nr_si_field_t si = rlc_nr_si_field_t::full_sdu;
if (retx.is_segment) {
@ -506,10 +507,8 @@ rlc_am_nr_tx::build_retx_pdu_without_segmentation(rlc_amd_retx_nr_t& retx, uint8
current_so = retx.current_so;
}
rlc_am_nr_pdu_header_t new_header = tx_pdu.header;
new_header.p = get_pdu_poll(true, 0);
new_header.si = si;
new_header.so = current_so;
uint32_t hdr_len = rlc_am_nr_write_data_pdu_header(new_header, payload);
// Write payload into PDU
uint32_t retx_pdu_payload_size = 0;
@ -520,9 +519,12 @@ rlc_am_nr_tx::build_retx_pdu_without_segmentation(rlc_amd_retx_nr_t& retx, uint8
// RETX SDU segment
retx_pdu_payload_size = (retx.so_start + retx.segment_length - retx.current_so);
}
retx_queue->pop();
new_header.p = get_pdu_poll(true, 0);
uint32_t hdr_len = rlc_am_nr_write_data_pdu_header(new_header, payload);
uint32_t pdu_bytes = hdr_len + retx_pdu_payload_size;
srsran_assert(pdu_bytes <= nof_bytes, "Error calculating hdr_len and pdu_payload_len");
memcpy(&payload[hdr_len], &tx_pdu.sdu_buf->msg[retx.current_so], retx_pdu_payload_size);
memcpy(&payload[hdr_len], &tx_pdu.sdu_buf->msg[current_so], retx_pdu_payload_size);
// Update RETX queue and log
retx_queue->pop();
@ -533,7 +535,7 @@ rlc_am_nr_tx::build_retx_pdu_without_segmentation(rlc_amd_retx_nr_t& retx, uint8
(*tx_window)[retx.sn].sdu_buf->N_bytes,
(*tx_window)[retx.sn].retx_count + 1,
cfg.max_retx_thresh);
RlcHexInfo(payload, pdu_bytes, "RETX PDU SN=%d (%d B)", retx.sn, pdu_bytes);
RlcHexInfo(payload, pdu_bytes, "RETX PDU SN=%d (%d B)", retx_sn, pdu_bytes);
log_rlc_am_nr_pdu_header_to_string(logger.debug, new_header, rb_name);
debug_state();
@ -927,13 +929,16 @@ uint8_t rlc_am_nr_tx::get_pdu_poll(bool is_retx, uint32_t sdu_bytes)
poll = 1;
}
}
/*
* - if both the transmission buffer and the retransmission buffer becomes empty (excluding transmitted RLC SDUs
or RLC SDU segments awaiting acknowledgements) after the transmission of the AMD PDU; or
* - if both the transmission buffer and the retransmission buffer becomes empty
* (excluding transmitted RLC SDUs or RLC SDU segments awaiting acknowledgements)
* after the transmission of the AMD PDU; or
* - if no new RLC SDU can be transmitted after the transmission of the AMD PDU (e.g. due to window stalling);
* - include a poll in the AMD PDU as described below.
*/
if (tx_sdu_queue.is_empty() && retx_queue->empty()) {
if ((tx_sdu_queue.is_empty() && retx_queue->empty()) || tx_window->full()) {
poll = 1;
}

27
lib/test/rlc/rlc_am_nr_test.cc
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@ -411,7 +411,21 @@ int lost_pdu_test(rlc_am_nr_sn_size_t sn_size)
rlc2.write_pdu(retx_buf.msg, retx_buf.N_bytes);
TESTASSERT_EQ(3, rlc2.get_buffer_state()); // Status report shoud be required, as the TX buffers are now empty.
}
{
// Double check status report
byte_buffer_t status_buf;
int len = rlc2.read_pdu(status_buf.msg, 3);
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(0, status_check.N_nack); // All PDUs are acked now
}
// Check statistics
@ -420,7 +434,8 @@ int lost_pdu_test(rlc_am_nr_sn_size_t sn_size)
uint32_t total_tx_pdu_bytes1 = (NBUFS + 1) * data_pdu_size; // (NBUFS + 1 RETX) * PDU size
uint32_t total_rx_pdu_bytes1 = 2 * status_pdu_ack_size + status_pdu_nack_size; // Two status PDU (one with a NACK)
uint32_t total_tx_pdu_bytes2 = total_rx_pdu_bytes1; // Two status PDU (one with a NACK)
uint32_t total_tx_pdu_bytes2 =
3 * status_pdu_ack_size + status_pdu_nack_size; // Three status PDU (one with a NACK, two without)
uint32_t total_rx_pdu_bytes2 = (NBUFS)*data_pdu_size; // (NBUFS - 1 Lost + 1 RETX) * PDU size
// SDU metrics
@ -443,9 +458,9 @@ int lost_pdu_test(rlc_am_nr_sn_size_t sn_size)
TESTASSERT_EQ(5, metrics2.num_rx_sdu_bytes);
TESTASSERT_EQ(0, metrics2.num_lost_sdus);
// SDU metrics
TESTASSERT_EQ(2, metrics2.num_tx_pdus); // Two status PDUs
TESTASSERT_EQ(3, metrics2.num_tx_pdus); // Three status PDUs
TESTASSERT_EQ(5, metrics2.num_rx_pdus); // 5 PDUs (6 tx'ed, but one was lost)
TESTASSERT_EQ(total_tx_pdu_bytes2, metrics2.num_tx_pdu_bytes); // Two status PDU (one with a NACK)
TESTASSERT_EQ(total_tx_pdu_bytes2, metrics2.num_tx_pdu_bytes); // Three status PDU (one with a NACK, two without)
TESTASSERT_EQ(total_rx_pdu_bytes2, metrics2.num_rx_pdu_bytes); // (NBUFS - 1 Lost + 1 RETX) * PDU size
TESTASSERT_EQ(0, metrics2.num_lost_sdus); // No lost SDUs
return SRSRAN_SUCCESS;
@ -1421,6 +1436,7 @@ int poll_test_poll_retx()
}
return SRSRAN_SUCCESS;
}
int main()
{
// Setup the log message spy to intercept error and warning log entries from RLC
@ -1463,10 +1479,5 @@ int main()
TESTASSERT(poll_test_poll_pdu() == SRSRAN_SUCCESS);
TESTASSERT(poll_test_poll_byte() == SRSRAN_SUCCESS);
TESTASSERT(poll_test_poll_retx() == SRSRAN_SUCCESS);
// Test p bit *not* set on RETX with PollPDU
// Test p bit *not* set on RETX with PollBYTE
// Test p bit set on empty TX queue and empty retx queue
// Test p bit *not* set on empty TX queue and empty retx queue
// Test p bit set on window stall
return SRSRAN_SUCCESS;
}

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