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lib,rlc_am_nr_packing: unit test + bugfix for trimming of status PDUs

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master
Robert Falkenberg 3 years ago
parent 872e55a84e
commit a2332d10f2
2 changed files with 238 additions and 2 deletions
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4
lib/src/rlc/rlc_am_nr_packing.cc
Unescape Escape View File

@ -51,7 +51,7 @@ bool rlc_am_nr_status_pdu_t::trim(uint32_t max_packed_size)
// no trimming required
return true;
}
if (max_packed_size <= rlc_am_nr_status_pdu_sizeof_header_ack_sn) {
if (max_packed_size < rlc_am_nr_status_pdu_sizeof_header_ack_sn) {
// too little space for smallest possible status PDU (only header + ACK).
return false;
}
@ -61,7 +61,7 @@ bool rlc_am_nr_status_pdu_t::trim(uint32_t max_packed_size)
// see TS 38.322 Sec. 5.3.4:
// "set the ACK_SN to the SN of the next not received RLC SDU
// which is not indicated as missing in the resulting STATUS PDU."
while (nacks_.size() > 0 && (max_packed_size >= packed_size_ || nacks_.back().nack_sn == ack_sn)) {
while (nacks_.size() > 0 && (max_packed_size < packed_size_ || nacks_.back().nack_sn == ack_sn)) {
packed_size_ -= nack_size(nacks_.back());
ack_sn = nacks_.back().nack_sn;
nacks_.pop_back();

236
lib/test/rlc/rlc_am_nr_pdu_test.cc
Unescape Escape View File

@ -433,6 +433,232 @@ int rlc_am_nr_control_pdu_12bit_sn_test_nack_range()
return SRSRAN_SUCCESS;
}
// Test status PDU for correct trimming and estimation of packed size
// 1) Test init, copy and reset
// 2) Test step-wise growth and trimming of status PDU while covering several corner cases
int rlc_am_nr_control_pdu_test_trimming(rlc_am_nr_sn_size_t sn_size)
{
test_delimit_logger delimiter("Control PDU ({} bit SN) test trimming", to_number(sn_size));
// status PDU with no NACKs
{
constexpr uint32_t min_size = 3;
srsran::byte_buffer_t pdu;
rlc_am_nr_status_pdu_t status_pdu(sn_size);
status_pdu.ack_sn = 99;
TESTASSERT_EQ(status_pdu.packed_size, min_size); // minimum size
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, min_size);
rlc_am_nr_status_pdu_t status_pdu_copy = status_pdu;
TESTASSERT_EQ(status_pdu_copy.ack_sn, 99);
TESTASSERT_EQ(status_pdu_copy.packed_size, min_size); // minimum size
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu_copy, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, min_size);
status_pdu.reset();
status_pdu.ack_sn = 77;
TESTASSERT_EQ(status_pdu.packed_size, min_size); // should still have minimum size
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, min_size);
TESTASSERT_EQ(status_pdu_copy.ack_sn, 99); // shouldn't have changed
TESTASSERT_EQ(status_pdu_copy.packed_size, min_size); // minimum size
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu_copy, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, min_size);
}
// status PDU with multiple NACKs
// expect: ACK=77, NACKs=[12][14][17 50:99][17 150:199][17 250:299][19][21 333:111 r5][27 444:666 r3]
{
constexpr uint32_t min_size = 3;
const uint32_t nack_size = sn_size == rlc_am_nr_sn_size_t::size12bits ? 2 : 3;
constexpr uint32_t so_size = 4;
constexpr uint32_t range_size = 1;
uint32_t expected_size = min_size;
srsran::byte_buffer_t pdu;
rlc_am_nr_status_pdu_t status_pdu(sn_size);
status_pdu.ack_sn = 77;
{
rlc_status_nack_t nack;
nack.nack_sn = 12;
status_pdu.push_nack(nack);
}
expected_size += nack_size;
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
{
rlc_status_nack_t nack;
nack.nack_sn = 14;
status_pdu.push_nack(nack);
}
expected_size += nack_size;
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
{
rlc_status_nack_t nack;
nack.nack_sn = 17;
nack.has_so = true;
nack.so_start = 50;
nack.so_end = 99;
status_pdu.push_nack(nack);
}
expected_size += nack_size + so_size;
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
{
rlc_status_nack_t nack;
nack.nack_sn = 17;
nack.has_so = true;
nack.so_start = 150;
nack.so_end = 199;
status_pdu.push_nack(nack);
}
expected_size += nack_size + so_size;
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
{
rlc_status_nack_t nack;
nack.nack_sn = 17;
nack.has_so = true;
nack.so_start = 250;
nack.so_end = 299;
status_pdu.push_nack(nack);
}
expected_size += nack_size + so_size;
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
{
rlc_status_nack_t nack;
nack.nack_sn = 19;
status_pdu.push_nack(nack);
}
expected_size += nack_size;
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
{
rlc_status_nack_t nack;
nack.nack_sn = 21;
nack.has_so = true;
nack.so_start = 333;
nack.so_end = 111;
nack.has_nack_range = true;
nack.nack_range = 5;
status_pdu.push_nack(nack);
}
expected_size += nack_size + so_size + range_size;
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
{
rlc_status_nack_t nack;
nack.nack_sn = 27;
nack.has_so = true;
nack.so_start = 444;
nack.so_end = 666;
nack.has_nack_range = true;
nack.nack_range = 3;
status_pdu.push_nack(nack);
}
expected_size += nack_size + so_size + range_size;
TESTASSERT_EQ(status_pdu.ack_sn, 77);
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
// current state: ACK=77, NACKs=[12][14][17 50:99][17 150:199][17 250:299][19][21 333:111 r5][27 444:666 r3]
// create a copy, check content
rlc_am_nr_status_pdu_t status_pdu_copy = status_pdu;
TESTASSERT_EQ(status_pdu_copy.ack_sn, 77);
TESTASSERT_EQ(status_pdu_copy.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu_copy, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
// current state: ACK=77, NACKs=[12][14][17 50:99][17 150:199][17 250:299][19][21 333:111 r5][27 444:666 r3]
// trim to much larger size: nothing should change
TESTASSERT_EQ(status_pdu.trim(expected_size * 2), true);
TESTASSERT_EQ(status_pdu.ack_sn, 77);
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
// trim to exact size: nothing should change
TESTASSERT_EQ(status_pdu.trim(expected_size), true);
TESTASSERT_EQ(status_pdu.ack_sn, 77);
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
// trim to (expected_size - 1): this should remove the last NACK and update ACK accordingly
TESTASSERT_EQ(status_pdu.trim(expected_size - 1), true);
expected_size -= nack_size + so_size + range_size;
TESTASSERT_EQ(status_pdu.ack_sn, 27);
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
// current state: ACK=27, NACKs=[12][14][17 50:99][17 150:199][17 250:299][19][21 333:111 r5]
// trim to (expected_size - last two NACKs): this should remove the last NACK and update ACK accordingly
TESTASSERT_EQ(status_pdu.trim(expected_size - (2 * nack_size + so_size + range_size)), true);
expected_size -= 2 * nack_size + so_size + range_size;
TESTASSERT_EQ(status_pdu.ack_sn, 19);
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
// current state: ACK=19, NACKs=[12][14][17 50:99][17 150:199][17 250:299]
// trim to (expected_size - 1): this should remove the last NACK and all other NACKs with the same SN
TESTASSERT_EQ(status_pdu.trim(expected_size - 1), true);
expected_size -= 3 * (nack_size + so_size);
TESTASSERT_EQ(status_pdu.ack_sn, 17);
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
// current state: ACK=17, NACKs=[12][14]
// trim to impossible size = 1: this should report a failure without changes of the PDU
TESTASSERT_EQ(status_pdu.trim(1), false);
TESTASSERT_EQ(status_pdu.ack_sn, 17);
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
// current state: ACK=17, NACKs=[12][14]
// trim to minimum size: this should remove all NACKs and update ACK to the SN of the first NACK
expected_size = min_size;
TESTASSERT_EQ(status_pdu.trim(expected_size), true);
TESTASSERT_EQ(status_pdu.ack_sn, 12);
TESTASSERT_EQ(status_pdu.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
// current state: ACK=12, NACKs empty
// check the copy again - should be unchanged if not a shallow copy
TESTASSERT_EQ(status_pdu_copy.ack_sn, 77);
TESTASSERT_EQ(status_pdu_copy.packed_size, expected_size);
TESTASSERT_EQ(rlc_am_nr_write_status_pdu(status_pdu_copy, sn_size, &pdu), SRSRAN_SUCCESS);
TESTASSERT_EQ(pdu.N_bytes, expected_size);
}
return SRSRAN_SUCCESS;
}
///< Control PDU tests (18bit SN)
// Status PDU for 18bit SN with ACK_SN=235929=0x39999=0b11 1001 1001 1001 1001 and no further NACK_SN (E1 bit not set)
int rlc_am_nr_control_pdu_18bit_sn_test1()
@ -786,6 +1012,11 @@ int main(int argc, char** argv)
return SRSRAN_ERROR;
}
if (rlc_am_nr_control_pdu_test_trimming(rlc_am_nr_sn_size_t::size12bits)) {
fprintf(stderr, "rlc_am_nr_control_pdu_test_trimming(size12bits) failed.\n");
return SRSRAN_ERROR;
}
if (rlc_am_nr_control_pdu_18bit_sn_test1()) {
fprintf(stderr, "rlc_am_nr_control_pdu_18bit_sn_test1() failed.\n");
return SRSRAN_ERROR;
@ -816,5 +1047,10 @@ int main(int argc, char** argv)
return SRSRAN_ERROR;
}
if (rlc_am_nr_control_pdu_test_trimming(rlc_am_nr_sn_size_t::size18bits)) {
fprintf(stderr, "rlc_am_nr_control_pdu_test_trimming(size18bits) failed.\n");
return SRSRAN_ERROR;
}
return SRSRAN_SUCCESS;
}

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