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lib,rlc_am_nr: Added handle_full_sdu() and handle_segment_sdu() functions. Reduced duplicate code in handling SDU segments.

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master
Pedro Alvarez 3 years ago
parent 8afea13d9a
commit 9e6b852834
2 changed files with 98 additions and 82 deletions
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3
lib/include/srsran/rlc/rlc_am_nr.h
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@ -209,7 +209,8 @@ public:
uint32_t get_status_pdu_length();
// Data handling methods
void handle_data_pdu_full(uint8_t* payload, uint32_t nof_bytes, rlc_am_nr_pdu_header_t& header);
int handle_full_data_sdu(const rlc_am_nr_pdu_header_t& header, const uint8_t* payload, uint32_t nof_bytes);
int handle_segment_data_sdu(const rlc_am_nr_pdu_header_t& header, const uint8_t* payload, uint32_t nof_bytes);
bool inside_rx_window(uint32_t sn);
void write_to_upper_layers(uint32_t lcid, unique_byte_buffer_t sdu);
bool have_all_segments_been_received(const std::list<rlc_amd_rx_pdu_nr>& segment_list);

175
lib/src/rlc/rlc_am_nr.cc
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@ -645,91 +645,17 @@ void rlc_am_nr_rx::handle_data_pdu(uint8_t* payload, uint32_t nof_bytes)
return;
}
// Write to rx window
// Write to rx window either full SDU or SDU segment
if (header.si == rlc_nr_si_field_t::full_sdu) {
// Full SDU received. Add SDU to Rx Window and copy full PDU into SDU buffer.
rlc_amd_rx_sdu_nr_t& rx_sdu = rx_window.add_pdu(header.sn);
rx_sdu.buf = srsran::make_byte_buffer();
if (rx_sdu.buf == nullptr) {
logger->error("Fatal Error: Couldn't allocate PDU in %s.", __FUNCTION__);
rx_window.remove_pdu(header.sn);
return;
}
rx_sdu.buf->set_timestamp();
// check available space for payload
if (nof_bytes > rx_sdu.buf->get_tailroom()) {
logger->error("%s Discarding SN=%d of size %d B (available space %d B)",
parent->rb_name,
header.sn,
nof_bytes,
rx_sdu.buf->get_tailroom());
int err = handle_full_data_sdu(header, payload, nof_bytes);
if (err != SRSRAN_SUCCESS) {
return;
}
memcpy(rx_sdu.buf->msg, payload + hdr_len, nof_bytes - hdr_len); // Don't copy header
rx_sdu.buf->N_bytes = nof_bytes - hdr_len;
rx_sdu.fully_received = true;
write_to_upper_layers(parent->lcid, std::move(rx_window[header.sn].buf));
} else if (header.si == rlc_nr_si_field_t::first_segment) { // Check whether it's a full SDU
logger->info("Initial segment PDU. SN=%d.", header.sn);
rlc_amd_rx_sdu_nr_t& rx_sdu = rx_window.add_pdu(header.sn);
rlc_amd_rx_pdu_nr pdu_segment = {};
pdu_segment.header = header;
pdu_segment.buf = srsran::make_byte_buffer();
if (pdu_segment.buf == nullptr) {
logger->error("Fatal Error: Couldn't allocate PDU in %s.", __FUNCTION__);
rx_window.remove_pdu(header.sn);
} else {
int err = handle_segment_data_sdu(header, payload, nof_bytes);
if (err != SRSRAN_SUCCESS) {
return;
}
memcpy(pdu_segment.buf->msg, payload + hdr_len, nof_bytes - hdr_len); // Don't copy header
pdu_segment.buf->N_bytes = nof_bytes - hdr_len;
rx_sdu.segments.push_back(std::move(pdu_segment));
} else if (header.si == rlc_nr_si_field_t::neither_first_nor_last_segment) {
logger->info("Middle segment PDU. SN=%d.", header.sn);
rlc_amd_rx_sdu_nr_t& rx_sdu = rx_window.has_sn(header.sn) ? rx_window[header.sn] : rx_window.add_pdu(header.sn);
rlc_amd_rx_pdu_nr pdu_segment = {};
pdu_segment.header = header;
pdu_segment.buf = srsran::make_byte_buffer();
if (pdu_segment.buf == nullptr) {
logger->error("Fatal Error: Couldn't allocate PDU in %s.", __FUNCTION__);
rx_window.remove_pdu(header.sn);
return;
}
memcpy(pdu_segment.buf->msg, payload + hdr_len, nof_bytes - hdr_len); // Don't copy header
pdu_segment.buf->N_bytes = nof_bytes - hdr_len;
rx_sdu.segments.push_back(std::move(pdu_segment));
} else if (header.si == rlc_nr_si_field_t::last_segment) {
logger->info("Final segment PDU. SN=%d.", header.sn);
rlc_amd_rx_sdu_nr_t& rx_sdu = rx_window.has_sn(header.sn) ? rx_window[header.sn] : rx_window.add_pdu(header.sn);
rlc_amd_rx_pdu_nr pdu_segment = {};
pdu_segment.header = header;
pdu_segment.buf = srsran::make_byte_buffer();
if (pdu_segment.buf == nullptr) {
logger->error("Fatal Error: Couldn't allocate PDU in %s.", __FUNCTION__);
rx_window.remove_pdu(header.sn);
return;
}
memcpy(pdu_segment.buf->msg, payload + hdr_len, nof_bytes - hdr_len); // Don't copy header
pdu_segment.buf->N_bytes = nof_bytes - hdr_len;
rx_sdu.segments.push_back(std::move(pdu_segment));
rx_sdu.fully_received = have_all_segments_been_received(rx_sdu.segments);
if (rx_sdu.fully_received) {
logger->info("Fully received segmented SDU. SN=%d.", header.sn);
rx_sdu.buf = srsran::make_byte_buffer();
if (rx_sdu.buf == nullptr) {
logger->error("Fatal Error: Couldn't allocate PDU in %s.", __FUNCTION__);
rx_window.remove_pdu(header.sn);
return;
}
for (const auto& it : rx_sdu.segments) {
memcpy(&rx_sdu.buf->msg[rx_sdu.buf->N_bytes], it.buf->msg, it.buf->N_bytes);
rx_sdu.buf->N_bytes += it.buf->N_bytes;
}
write_to_upper_layers(parent->lcid, std::move(rx_window[header.sn].buf));
}
}
// Check poll bit
@ -828,6 +754,95 @@ void rlc_am_nr_rx::handle_data_pdu(uint8_t* payload, uint32_t nof_bytes)
}
}
/*
* SDU handling helpers
*/
int rlc_am_nr_rx::handle_full_data_sdu(const rlc_am_nr_pdu_header_t& header, const uint8_t* payload, uint32_t nof_bytes)
{
uint32_t hdr_len = rlc_am_nr_packed_length(header);
// Full SDU received. Add SDU to Rx Window and copy full PDU into SDU buffer.
rlc_amd_rx_sdu_nr_t& rx_sdu = rx_window.add_pdu(header.sn);
rx_sdu.buf = srsran::make_byte_buffer();
if (rx_sdu.buf == nullptr) {
logger->error("Fatal Error: Couldn't allocate PDU in %s.", __FUNCTION__);
rx_window.remove_pdu(header.sn);
return SRSRAN_ERROR;
}
rx_sdu.buf->set_timestamp();
// check available space for payload
if (nof_bytes > rx_sdu.buf->get_tailroom()) {
logger->error("%s Discarding SN=%d of size %d B (available space %d B)",
parent->rb_name,
header.sn,
nof_bytes,
rx_sdu.buf->get_tailroom());
rx_window.remove_pdu(header.sn);
return SRSRAN_ERROR;
}
memcpy(rx_sdu.buf->msg, payload + hdr_len, nof_bytes - hdr_len); // Don't copy header
rx_sdu.buf->N_bytes = nof_bytes - hdr_len;
rx_sdu.fully_received = true;
write_to_upper_layers(parent->lcid, std::move(rx_window[header.sn].buf));
return SRSRAN_SUCCESS;
}
int rlc_am_nr_rx::handle_segment_data_sdu(const rlc_am_nr_pdu_header_t& header,
const uint8_t* payload,
uint32_t nof_bytes)
{
if (header.si == rlc_nr_si_field_t::full_sdu) {
logger->error("Called %s but the SI implies a full SDU. SN=%d", __FUNCTION__, header.sn);
return SRSRAN_ERROR;
}
uint32_t hdr_len = rlc_am_nr_packed_length(header);
// Log SDU segment reception
if (header.si == rlc_nr_si_field_t::first_segment) { // Check whether it's a full SDU
logger->info("Initial segment PDU. SN=%d.", header.sn);
} else if (header.si == rlc_nr_si_field_t::neither_first_nor_last_segment) {
logger->info("Middle segment PDU. SN=%d.", header.sn);
} else if (header.si == rlc_nr_si_field_t::last_segment) {
logger->info("Final segment PDU. SN=%d.", header.sn);
}
// Add a new SDU to the RX window if necessary
rlc_amd_rx_sdu_nr_t& rx_sdu = rx_window.has_sn(header.sn) ? rx_window[header.sn] : rx_window.add_pdu(header.sn);
// Create PDU segment info, to be stored later
rlc_amd_rx_pdu_nr pdu_segment = {};
pdu_segment.header = header;
pdu_segment.buf = srsran::make_byte_buffer();
if (pdu_segment.buf == nullptr) {
logger->error("Fatal Error: Couldn't allocate PDU in %s.", __FUNCTION__);
return SRSRAN_ERROR;
}
memcpy(pdu_segment.buf->msg, payload + hdr_len, nof_bytes - hdr_len); // Don't copy header
pdu_segment.buf->N_bytes = nof_bytes - hdr_len;
// Store SDU segment. TODO sort by SO and check for duplicate bytes.
rx_sdu.segments.push_back(std::move(pdu_segment));
// Check weather all segments have been received
rx_sdu.fully_received = have_all_segments_been_received(rx_sdu.segments);
if (rx_sdu.fully_received) {
logger->info("Fully received segmented SDU. SN=%d.", header.sn);
rx_sdu.buf = srsran::make_byte_buffer();
if (rx_sdu.buf == nullptr) {
logger->error("Fatal Error: Couldn't allocate PDU in %s.", __FUNCTION__);
rx_window.remove_pdu(header.sn);
return SRSRAN_ERROR;
}
for (const auto& it : rx_sdu.segments) {
memcpy(&rx_sdu.buf->msg[rx_sdu.buf->N_bytes], it.buf->msg, it.buf->N_bytes);
rx_sdu.buf->N_bytes += it.buf->N_bytes;
}
write_to_upper_layers(parent->lcid, std::move(rx_window[header.sn].buf));
}
return SRSRAN_SUCCESS;
}
/*
* Status PDU
*/

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