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Refactored RLC AM segment pool for re-use in both LTE and NR

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Moved RLC AMD PDU definitions from rlc_am_lte.h to rlc_common.h to make them re-usable in both RLC LTE and RLC NR
master
Pedro Alvarez 3 years ago
parent 54be15e7a6
commit debb4a0c6b
7 changed files with 159 additions and 151 deletions
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136
lib/include/srsran/rlc/rlc_am_data_structs.h
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@ -16,60 +16,138 @@
#include "srsran/adt/circular_buffer.h"
#include "srsran/adt/circular_map.h"
#include "srsran/adt/intrusive_list.h"
#include "srsran/common/buffer_pool.h"
#include <array>
#include <vector>
namespace srsran {
template <typename header_t>
class rlc_amd_tx_pdu;
template <typename header_t>
class pdcp_pdu_info;
/// Pool that manages the allocation of RLC AM PDU Segments to RLC PDUs and tracking of segments ACK state
template <typename header_t>
struct rlc_am_pdu_segment_pool {
const static size_t MAX_POOL_SIZE = 16384;
using rlc_list_tag = default_intrusive_tag;
struct free_list_tag {};
/// RLC AM PDU Segment, containing the PDCP SN and RLC SN it has been assigned to, and its current ACK state
using rlc_list_tag = default_intrusive_tag;
struct free_list_tag {};
struct segment_resource : public intrusive_forward_list_element<rlc_list_tag>,
public intrusive_forward_list_element<free_list_tag>,
public intrusive_double_linked_list_element<> {
const static uint32_t invalid_rlc_sn = std::numeric_limits<uint32_t>::max();
const static uint32_t invalid_pdcp_sn = std::numeric_limits<uint32_t>::max() - 1; // -1 for Status Report
int id() const;
void release_pdcp_sn();
void release_rlc_sn();
int id() const { return std::distance(parent_pool->segments.cbegin(), this); }
void release_pdcp_sn()
{
pdcp_sn_ = invalid_pdcp_sn;
if (empty()) {
parent_pool->free_list.push_front(this);
}
}
void release_rlc_sn()
{
rlc_sn_ = invalid_rlc_sn;
if (empty()) {
parent_pool->free_list.push_front(this);
}
}
uint32_t rlc_sn() const { return rlc_sn_; }
uint32_t pdcp_sn() const { return pdcp_sn_; }
bool empty() const { return rlc_sn_ == invalid_rlc_sn and pdcp_sn_ == invalid_pdcp_sn; }
private:
friend struct rlc_am_pdu_segment_pool;
friend struct rlc_am_pdu_segment_pool<header_t>;
uint32_t rlc_sn_ = invalid_rlc_sn;
uint32_t pdcp_sn_ = invalid_pdcp_sn;
rlc_am_pdu_segment_pool* parent_pool = nullptr;
rlc_am_pdu_segment_pool<header_t>* parent_pool = nullptr;
};
rlc_am_pdu_segment_pool();
rlc_am_pdu_segment_pool()
{
for (segment_resource& s : segments) {
s.parent_pool = this;
free_list.push_front(&s);
}
}
rlc_am_pdu_segment_pool(const rlc_am_pdu_segment_pool&) = delete;
rlc_am_pdu_segment_pool(rlc_am_pdu_segment_pool&&) = delete;
rlc_am_pdu_segment_pool& operator=(const rlc_am_pdu_segment_pool&) = delete;
rlc_am_pdu_segment_pool& operator=(rlc_am_pdu_segment_pool&&) = delete;
bool has_segments() const { return not free_list.empty(); }
bool make_segment(rlc_amd_tx_pdu& rlc_list, pdcp_pdu_info& pdcp_info);
bool make_segment(rlc_amd_tx_pdu<header_t>& rlc_list, pdcp_pdu_info<header_t>& pdcp_list)
{
if (not has_segments()) {
return false;
}
segment_resource* segment = free_list.pop_front();
segment->rlc_sn_ = rlc_list.rlc_sn;
segment->pdcp_sn_ = pdcp_list.sn;
rlc_list.add_segment(*segment);
pdcp_list.add_segment(*segment);
return true;
}
private:
intrusive_forward_list<segment_resource, free_list_tag> free_list;
std::array<segment_resource, MAX_POOL_SIZE> segments;
intrusive_forward_list<rlc_am_pdu_segment_pool<header_t>::segment_resource, free_list_tag> free_list;
std::array<rlc_am_pdu_segment_pool<header_t>::segment_resource, MAX_POOL_SIZE> segments;
};
/// RLC AM PDU Segment, containing the PDCP SN and RLC SN it has been assigned to, and its current ACK state
using rlc_am_pdu_segment = rlc_am_pdu_segment_pool::segment_resource;
/// Class that contains the parameters and state (e.g. segments) of a RLC PDU
template <typename header_t>
class rlc_amd_tx_pdu
{
using rlc_am_pdu_segment = typename rlc_am_pdu_segment_pool<header_t>::segment_resource;
using list_type = intrusive_forward_list<rlc_am_pdu_segment>;
const static uint32_t invalid_rlc_sn = std::numeric_limits<uint32_t>::max();
list_type list;
public:
using iterator = typename list_type::iterator;
using const_iterator = typename list_type::const_iterator;
const uint32_t rlc_sn = invalid_rlc_sn;
uint32_t retx_count = 0;
header_t header;
unique_byte_buffer_t buf;
explicit rlc_amd_tx_pdu(uint32_t rlc_sn_) : rlc_sn(rlc_sn_) {}
rlc_amd_tx_pdu(const rlc_amd_tx_pdu&) = delete;
rlc_amd_tx_pdu(rlc_amd_tx_pdu&& other) noexcept = default;
rlc_amd_tx_pdu& operator=(const rlc_amd_tx_pdu& other) = delete;
rlc_amd_tx_pdu& operator=(rlc_amd_tx_pdu&& other) = delete;
~rlc_amd_tx_pdu()
{
while (not list.empty()) {
// remove from list
rlc_am_pdu_segment* segment = list.pop_front();
// deallocate if also removed from PDCP
segment->release_rlc_sn();
}
}
// Segment List Interface
void add_segment(rlc_am_pdu_segment& segment) { list.push_front(&segment); }
const_iterator begin() const { return list.begin(); }
const_iterator end() const { return list.end(); }
iterator begin() { return list.begin(); }
iterator end() { return list.end(); }
};
/// Class that contains the parameters and state (e.g. unACKed segments) of a PDCP PDU
template <typename header_t>
class pdcp_pdu_info
{
using rlc_am_pdu_segment = typename rlc_am_pdu_segment_pool<header_t>::segment_resource;
using list_type = intrusive_double_linked_list<rlc_am_pdu_segment>;
list_type list; // List of unACKed RLC PDUs that contain segments that belong to the PDCP PDU.
@ -97,7 +175,13 @@ public:
// Interface for list of unACKed RLC segments of the PDCP PDU
void add_segment(rlc_am_pdu_segment& segment) { list.push_front(&segment); }
void ack_segment(rlc_am_pdu_segment& segment);
void ack_segment(rlc_am_pdu_segment& segment)
{
// remove from list
list.pop(&segment);
// signal pool that the pdcp handle is released
segment.release_pdcp_sn();
}
void clear()
{
sn = invalid_pdcp_sn;
@ -106,6 +190,7 @@ public:
ack_segment(list.front());
}
}
const_iterator begin() const { return list.begin(); }
const_iterator end() const { return list.end(); }
};
@ -146,6 +231,7 @@ private:
srsran::static_circular_map<uint32_t, T, WINDOW_SIZE> window;
};
template <typename header_t>
struct buffered_pdcp_pdu_list {
public:
explicit buffered_pdcp_pdu_list() : buffered_pdus(buffered_pdcp_pdu_list::buffer_size) { clear(); }
@ -153,7 +239,7 @@ public:
void clear()
{
count = 0;
for (pdcp_pdu_info& b : buffered_pdus) {
for (pdcp_pdu_info<header_t>& b : buffered_pdus) {
b.clear();
}
}
@ -162,7 +248,7 @@ public:
{
srsran_expect(sn <= max_pdcp_sn or sn == status_report_sn, "Invalid PDCP SN=%d", sn);
srsran_assert(not has_pdcp_sn(sn), "Cannot re-add same PDCP SN twice");
pdcp_pdu_info& pdu = get_pdu_(sn);
pdcp_pdu_info<header_t>& pdu = get_pdu_(sn);
if (pdu.valid()) {
pdu.clear();
count--;
@ -170,21 +256,25 @@ public:
pdu.sn = sn;
count++;
}
void clear_pdcp_sdu(uint32_t sn)
{
pdcp_pdu_info& pdu = get_pdu_(sn);
pdcp_pdu_info<header_t>& pdu = get_pdu_(sn);
if (not pdu.valid()) {
{
return;
}
pdu.clear();
count--;
}
}
pdcp_pdu_info& operator[](uint32_t sn)
pdcp_pdu_info<header_t>& operator[](uint32_t sn)
{
srsran_expect(has_pdcp_sn(sn), "Invalid access to non-existent PDCP SN=%d", sn);
return get_pdu_(sn);
}
bool has_pdcp_sn(uint32_t pdcp_sn) const
{
srsran_expect(pdcp_sn <= max_pdcp_sn or pdcp_sn == status_report_sn, "Invalid PDCP SN=%d", pdcp_sn);
@ -195,20 +285,20 @@ public:
private:
const static size_t max_pdcp_sn = 262143u;
const static size_t buffer_size = 4096u;
const static uint32_t status_report_sn = pdcp_pdu_info::status_report_sn;
const static uint32_t status_report_sn = pdcp_pdu_info<header_t>::status_report_sn;
pdcp_pdu_info& get_pdu_(uint32_t sn)
pdcp_pdu_info<header_t>& get_pdu_(uint32_t sn)
{
return (sn == status_report_sn) ? status_report_pdu : buffered_pdus[static_cast<size_t>(sn % buffer_size)];
}
const pdcp_pdu_info& get_pdu_(uint32_t sn) const
const pdcp_pdu_info<header_t>& get_pdu_(uint32_t sn) const
{
return (sn == status_report_sn) ? status_report_pdu : buffered_pdus[static_cast<size_t>(sn % buffer_size)];
}
// size equal to buffer_size
std::vector<pdcp_pdu_info> buffered_pdus;
pdcp_pdu_info status_report_pdu;
std::vector<pdcp_pdu_info<header_t> > buffered_pdus;
pdcp_pdu_info<header_t> status_report_pdu;
uint32_t count = 0;
};

6
lib/include/srsran/rlc/rlc_am_lte.h
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@ -145,7 +145,7 @@ public:
rlc_am_lte* parent = nullptr;
byte_buffer_pool* pool = nullptr;
rlc_am_pdu_segment_pool segment_pool;
rlc_am_pdu_segment_pool<rlc_amd_pdu_header_t> segment_pool;
/****************************************************************************
* Configurable parameters
@ -183,10 +183,10 @@ public:
srsran::timer_handler::unique_timer status_prohibit_timer;
// SDU info for PDCP notifications
buffered_pdcp_pdu_list undelivered_sdu_info_queue;
buffered_pdcp_pdu_list<rlc_amd_pdu_header_t> undelivered_sdu_info_queue;
// Tx windows
rlc_ringbuffer_t<rlc_amd_tx_pdu, RLC_AM_WINDOW_SIZE> tx_window;
rlc_ringbuffer_t<rlc_amd_tx_pdu<rlc_amd_pdu_header_t>, RLC_AM_WINDOW_SIZE> tx_window;
pdu_retx_queue retx_queue;
pdcp_sn_vector_t notify_info_vec;

35
lib/include/srsran/rlc/rlc_am_lte_packing.h
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@ -20,38 +20,6 @@
namespace srsran {
/// Class that contains the parameters and state (e.g. segments) of a RLC PDU
class rlc_amd_tx_pdu
{
using list_type = intrusive_forward_list<rlc_am_pdu_segment>;
const static uint32_t invalid_rlc_sn = std::numeric_limits<uint32_t>::max();
list_type list;
public:
using iterator = typename list_type::iterator;
using const_iterator = typename list_type::const_iterator;
const uint32_t rlc_sn = invalid_rlc_sn;
uint32_t retx_count = 0;
rlc_amd_pdu_header_t header;
unique_byte_buffer_t buf;
explicit rlc_amd_tx_pdu(uint32_t rlc_sn_) : rlc_sn(rlc_sn_) {}
rlc_amd_tx_pdu(const rlc_amd_tx_pdu&) = delete;
rlc_amd_tx_pdu(rlc_amd_tx_pdu&& other) noexcept = default;
rlc_amd_tx_pdu& operator=(const rlc_amd_tx_pdu& other) = delete;
rlc_amd_tx_pdu& operator=(rlc_amd_tx_pdu&& other) = delete;
~rlc_amd_tx_pdu();
// Segment List Interface
void add_segment(rlc_am_pdu_segment& segment) { list.push_front(&segment); }
const_iterator begin() const { return list.begin(); }
const_iterator end() const { return list.end(); }
iterator begin() { return list.begin(); }
iterator end() { return list.end(); }
};
struct rlc_amd_retx_t {
uint32_t sn;
bool is_segment;
@ -95,7 +63,8 @@ uint32_t rlc_am_packed_length(rlc_status_pdu_t* status);
uint32_t rlc_am_packed_length(rlc_amd_retx_t retx);
bool rlc_am_is_pdu_segment(uint8_t* payload);
bool rlc_am_is_valid_status_pdu(const rlc_status_pdu_t& status, uint32_t rx_win_min = 0);
std::string rlc_am_undelivered_sdu_info_to_string(const std::map<uint32_t, pdcp_pdu_info>& info_queue);
std::string
rlc_am_undelivered_sdu_info_to_string(const std::map<uint32_t, pdcp_pdu_info<rlc_amd_pdu_header_t> >& info_queue);
void log_rlc_amd_pdu_header_to_string(srslog::log_channel& log_ch, const rlc_amd_pdu_header_t& header);
bool rlc_am_start_aligned(const uint8_t fi);
bool rlc_am_end_aligned(const uint8_t fi);

5
lib/include/srsran/rlc/rlc_am_nr.h
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@ -17,6 +17,8 @@
#include "srsran/common/common.h"
#include "srsran/common/timers.h"
#include "srsran/rlc/rlc_am_base.h"
#include "srsran/rlc/rlc_am_data_structs.h"
#include "srsran/rlc/rlc_am_nr_packing.h"
#include "srsran/upper/byte_buffer_queue.h"
#include <map>
#include <mutex>
@ -82,6 +84,9 @@ public:
uint32_t pdu_without_poll;
uint32_t byte_without_poll;
} st = {};
using rlc_amd_tx_pdu_nr = rlc_amd_tx_pdu<rlc_am_nr_pdu_header_t>;
rlc_ringbuffer_t<rlc_amd_tx_pdu_nr, RLC_AM_WINDOW_SIZE> tx_window;
};
// Receiver sub-class

5
lib/include/srsran/rlc/rlc_common.h
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@ -14,10 +14,13 @@
#define SRSRAN_RLC_COMMON_H
#include "srsran/adt/circular_buffer.h"
#include "srsran/adt/circular_map.h"
#include "srsran/adt/intrusive_list.h"
#include "srsran/interfaces/rlc_interface_types.h"
#include "srsran/rlc/bearer_mem_pool.h"
#include "srsran/rlc/rlc_metrics.h"
#include <stdlib.h>
#include <cstdlib>
#include <list>
namespace srsran {

76
lib/src/rlc/rlc_am_lte.cc
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@ -25,69 +25,9 @@
namespace srsran {
/*******************************
* RLC AM Segments
******************************/
int rlc_am_pdu_segment_pool::segment_resource::id() const
{
return std::distance(parent_pool->segments.cbegin(), this);
}
void rlc_am_pdu_segment_pool::segment_resource::release_pdcp_sn()
{
pdcp_sn_ = invalid_pdcp_sn;
if (empty()) {
parent_pool->free_list.push_front(this);
}
}
void rlc_am_pdu_segment_pool::segment_resource::release_rlc_sn()
{
rlc_sn_ = invalid_rlc_sn;
if (empty()) {
parent_pool->free_list.push_front(this);
}
}
rlc_am_pdu_segment_pool::rlc_am_pdu_segment_pool()
{
for (segment_resource& s : segments) {
s.parent_pool = this;
free_list.push_front(&s);
}
}
bool rlc_am_pdu_segment_pool::make_segment(rlc_amd_tx_pdu& rlc_list, pdcp_pdu_info& pdcp_list)
{
if (not has_segments()) {
return false;
}
segment_resource* segment = free_list.pop_front();
segment->rlc_sn_ = rlc_list.rlc_sn;
segment->pdcp_sn_ = pdcp_list.sn;
rlc_list.add_segment(*segment);
pdcp_list.add_segment(*segment);
return true;
}
void pdcp_pdu_info::ack_segment(rlc_am_pdu_segment& segment)
{
// remove from list
list.pop(&segment);
// signal pool that the pdcp handle is released
segment.release_pdcp_sn();
}
rlc_amd_tx_pdu::~rlc_amd_tx_pdu()
{
while (not list.empty()) {
// remove from list
rlc_am_pdu_segment* segment = list.pop_front();
// deallocate if also removed from PDCP
segment->release_rlc_sn();
}
}
using pdcp_pdu_info_lte = pdcp_pdu_info<rlc_amd_pdu_header_t>;
using rlc_amd_tx_pdu_lte = rlc_amd_tx_pdu<rlc_amd_pdu_header_t>;
using rlc_am_pdu_segment = rlc_am_pdu_segment_pool<rlc_amd_pdu_header_t>::segment_resource;
/****************************************************************************
* RLC AM LTE entity
@ -432,7 +372,7 @@ void rlc_am_lte::rlc_am_lte_tx::retransmit_pdu(uint32_t sn)
}
// select first PDU in tx window for retransmission
rlc_amd_tx_pdu& pdu = tx_window[sn];
rlc_amd_tx_pdu_lte& pdu = tx_window[sn];
// increment retx counter and inform upper layers
pdu.retx_count++;
@ -823,7 +763,7 @@ int rlc_am_lte::rlc_am_lte_tx::build_data_pdu(uint8_t* payload, uint32_t nof_byt
// insert newly assigned SN into window and use reference for in-place operations
// NOTE: from now on, we can't return from this function anymore before increasing vt_s
rlc_amd_tx_pdu& tx_pdu = tx_window.add_pdu(header.sn);
rlc_amd_tx_pdu_lte& tx_pdu = tx_window.add_pdu(header.sn);
uint32_t head_len = rlc_am_packed_length(&header);
uint32_t to_move = 0;
@ -843,7 +783,7 @@ int rlc_am_lte::rlc_am_lte_tx::build_data_pdu(uint8_t* payload, uint32_t nof_byt
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];
pdcp_pdu_info_lte& 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;
@ -914,7 +854,7 @@ int rlc_am_lte::rlc_am_lte_tx::build_data_pdu(uint8_t* payload, uint32_t nof_byt
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];
pdcp_pdu_info_lte& 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);
@ -1155,7 +1095,7 @@ void rlc_am_lte::rlc_am_lte_tx::update_notification_ack_info(uint32_t rlc_sn)
logger->debug("ACKed segment in RLC_SN=%d already discarded in PDCP. No need to notify the PDCP.", rlc_sn);
continue;
}
pdcp_pdu_info& info = undelivered_sdu_info_queue[pdcp_sn];
pdcp_pdu_info_lte& info = undelivered_sdu_info_queue[pdcp_sn];
// Remove RLC SN from PDCP PDU undelivered list
info.ack_segment(acked_segment);

3
lib/src/rlc/rlc_am_lte_packing.cc
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@ -276,7 +276,8 @@ bool rlc_am_is_valid_status_pdu(const rlc_status_pdu_t& status, uint32_t rx_win_
return true;
}
void rlc_am_undelivered_sdu_info_to_string(fmt::memory_buffer& buffer, const std::vector<pdcp_pdu_info>& info_queue)
void rlc_am_undelivered_sdu_info_to_string(fmt::memory_buffer& buffer,
const std::vector<pdcp_pdu_info<rlc_amd_pdu_header_t> >& info_queue)
{
fmt::format_to(buffer, "\n");
for (const auto& pdcp_pdu : info_queue) {

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