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280 lines
8.9 KiB
C++
280 lines
8.9 KiB
C++
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the distribution.
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*
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*/
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#ifndef SRSRAN_RLC_AM_LTE_H
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#define SRSRAN_RLC_AM_LTE_H
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#include "srsran/adt/accumulators.h"
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#include "srsran/adt/circular_array.h"
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#include "srsran/adt/circular_map.h"
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#include "srsran/common/buffer_pool.h"
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#include "srsran/common/common.h"
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#include "srsran/common/task_scheduler.h"
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#include "srsran/common/timeout.h"
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#include "srsran/interfaces/pdcp_interface_types.h"
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#include "srsran/rlc/rlc_am_base.h"
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#include "srsran/rlc/rlc_am_data_structs.h"
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#include "srsran/rlc/rlc_am_lte_packing.h"
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#include "srsran/rlc/rlc_common.h"
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#include "srsran/support/srsran_assert.h"
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#include "srsran/upper/byte_buffer_queue.h"
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#include <deque>
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#include <list>
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#include <map>
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namespace srsran {
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#undef RLC_AM_BUFFER_DEBUG
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class pdu_retx_queue
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{
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public:
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rlc_amd_retx_t& push()
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{
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assert(not full());
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rlc_amd_retx_t& p = buffer[wpos];
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wpos = (wpos + 1) % RLC_AM_WINDOW_SIZE;
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return p;
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}
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void pop() { rpos = (rpos + 1) % RLC_AM_WINDOW_SIZE; }
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rlc_amd_retx_t& front()
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{
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assert(not empty());
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return buffer[rpos];
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}
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void clear()
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{
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wpos = 0;
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rpos = 0;
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}
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bool has_sn(uint32_t sn) const
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{
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for (size_t i = rpos; i != wpos; i = (i + 1) % RLC_AM_WINDOW_SIZE) {
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if (buffer[i].sn == sn) {
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return true;
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}
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}
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return false;
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}
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size_t size() const { return (wpos >= rpos) ? wpos - rpos : RLC_AM_WINDOW_SIZE + wpos - rpos; }
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bool empty() const { return wpos == rpos; }
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bool full() const { return size() == RLC_AM_WINDOW_SIZE - 1; }
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private:
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std::array<rlc_amd_retx_t, RLC_AM_WINDOW_SIZE> buffer;
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size_t wpos = 0;
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size_t rpos = 0;
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};
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/******************************
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*
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* RLC AM LTE entity
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*
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*****************************/
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/******************************
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* RLC AM LTE TX entity
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*****************************/
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class rlc_am_lte_tx;
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class rlc_am_lte_rx;
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class rlc_am_lte_tx : public rlc_am::rlc_am_base_tx, timer_callback
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{
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public:
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explicit rlc_am_lte_tx(rlc_am* parent_);
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~rlc_am_lte_tx() = default;
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void set_rx(rlc_am_lte_rx* rx_) { rx = rx_; };
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bool configure(const rlc_config_t& cfg_);
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void empty_queue();
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void reestablish();
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void stop();
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uint32_t read_pdu(uint8_t* payload, uint32_t nof_bytes);
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void discard_sdu(uint32_t discard_sn);
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bool sdu_queue_is_full();
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bool has_data();
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uint32_t get_buffer_state();
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void get_buffer_state(uint32_t& n_bytes_newtx, uint32_t& n_bytes_prio);
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void empty_queue_nolock();
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void debug_state();
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// Timeout callback interface
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void timer_expired(uint32_t timeout_id) final;
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// Interface for Rx subclass
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void handle_control_pdu(uint8_t* payload, uint32_t nof_bytes);
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private:
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void stop_nolock();
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int build_status_pdu(uint8_t* payload, uint32_t nof_bytes);
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int build_retx_pdu(uint8_t* payload, uint32_t nof_bytes);
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int build_segment(uint8_t* payload, uint32_t nof_bytes, rlc_amd_retx_t retx);
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int build_data_pdu(uint8_t* payload, uint32_t nof_bytes);
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void update_notification_ack_info(uint32_t rlc_sn);
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int required_buffer_size(const rlc_amd_retx_t& retx);
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void retransmit_pdu(uint32_t sn);
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// Helpers
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bool poll_required();
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bool do_status();
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void check_sn_reached_max_retx(uint32_t sn);
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void get_buffer_state_nolock(uint32_t& new_tx, uint32_t& prio_tx);
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rlc_am* parent = nullptr;
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rlc_am_lte_rx* rx = nullptr;
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byte_buffer_pool* pool = nullptr;
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rlc_am_pdu_segment_pool<rlc_amd_pdu_header_t> segment_pool;
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/****************************************************************************
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* Configurable parameters
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* Ref: 3GPP TS 36.322 v10.0.0 Section 7
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***************************************************************************/
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rlc_am_config_t cfg = {};
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// TX SDU buffers
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unique_byte_buffer_t tx_sdu;
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/****************************************************************************
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* State variables and counters
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* Ref: 3GPP TS 36.322 v10.0.0 Section 7
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***************************************************************************/
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// Tx state variables
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uint32_t vt_a = 0; // ACK state. SN of next PDU in sequence to be ACKed. Low edge of tx window.
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uint32_t vt_ms = RLC_AM_WINDOW_SIZE; // Max send state. High edge of tx window. vt_a + window_size.
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uint32_t vt_s = 0; // Send state. SN to be assigned for next PDU.
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uint32_t poll_sn = 0; // Poll send state. SN of most recent PDU txed with poll bit set.
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// Tx counters
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uint32_t pdu_without_poll = 0;
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uint32_t byte_without_poll = 0;
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rlc_status_pdu_t tx_status;
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/****************************************************************************
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* Timers
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* Ref: 3GPP TS 36.322 v10.0.0 Section 7
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***************************************************************************/
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srsran::timer_handler::unique_timer poll_retx_timer;
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srsran::timer_handler::unique_timer status_prohibit_timer;
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// SDU info for PDCP notifications
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buffered_pdcp_pdu_list<rlc_amd_pdu_header_t> undelivered_sdu_info_queue;
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// Tx windows
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rlc_ringbuffer_t<rlc_amd_tx_pdu<rlc_amd_pdu_header_t>, RLC_AM_WINDOW_SIZE> tx_window;
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pdu_retx_queue retx_queue;
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pdcp_sn_vector_t notify_info_vec;
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// Mutexes
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std::mutex mutex;
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// default to RLC SDU queue length
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const uint32_t MAX_SDUS_PER_RLC_PDU = RLC_TX_QUEUE_LEN;
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};
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/******************************
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* RLC AM LTE RX entity
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*****************************/
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class rlc_am_lte_rx : public rlc_am::rlc_am_base_rx, public timer_callback
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{
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public:
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explicit rlc_am_lte_rx(rlc_am* parent_);
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~rlc_am_lte_rx() = default;
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void set_tx(rlc_am_lte_tx* tx_) { tx = tx_; };
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bool configure(const rlc_config_t& cfg_) final;
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void reestablish() final;
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void stop() final;
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uint32_t get_rx_buffered_bytes() final; // returns sum of PDUs in rx_window
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uint32_t get_sdu_rx_latency_ms() final;
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// Timeout callback interface
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void timer_expired(uint32_t timeout_id) final;
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// Functions needed by Tx subclass to query rx state
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int get_status_pdu_length();
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int get_status_pdu(rlc_status_pdu_t* status, uint32_t nof_bytes);
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bool get_do_status();
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private:
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void handle_data_pdu(uint8_t* payload, uint32_t nof_bytes) final;
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void handle_data_pdu_full(uint8_t* payload, uint32_t nof_bytes, rlc_amd_pdu_header_t& header);
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void handle_data_pdu_segment(uint8_t* payload, uint32_t nof_bytes, rlc_amd_pdu_header_t& header);
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void reassemble_rx_sdus();
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bool inside_rx_window(const int16_t sn);
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void debug_state();
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void print_rx_segments();
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bool add_segment_and_check(rlc_amd_rx_pdu_segments_t* pdu, rlc_amd_rx_pdu* segment);
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void reset_status();
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rlc_am* parent = nullptr;
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rlc_am_lte_tx* tx = nullptr;
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byte_buffer_pool* pool = nullptr;
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/****************************************************************************
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* Configurable parameters
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* Ref: 3GPP TS 36.322 v10.0.0 Section 7
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***************************************************************************/
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rlc_am_config_t cfg = {};
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// RX SDU buffers
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unique_byte_buffer_t rx_sdu;
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/****************************************************************************
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* State variables and counters
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* Ref: 3GPP TS 36.322 v10.0.0 Section 7
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***************************************************************************/
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// Rx state variables
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uint32_t vr_r = 0; // Receive state. SN following last in-sequence received PDU. Low edge of rx window
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uint32_t vr_mr = RLC_AM_WINDOW_SIZE; // Max acceptable receive state. High edge of rx window. vr_r + window size.
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uint32_t vr_x = 0; // t_reordering state. SN following PDU which triggered t_reordering.
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uint32_t vr_ms = 0; // Max status tx state. Highest possible value of SN for ACK_SN in status PDU.
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uint32_t vr_h = 0; // Highest rx state. SN following PDU with highest SN among rxed PDUs.
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// Mutex to protect members
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std::mutex mutex;
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// Rx windows
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rlc_ringbuffer_t<rlc_amd_rx_pdu, RLC_AM_WINDOW_SIZE> rx_window;
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std::map<uint32_t, rlc_amd_rx_pdu_segments_t> rx_segments;
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bool poll_received = false;
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std::atomic<bool> do_status = {false}; // light-weight access from Tx entity
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/****************************************************************************
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* Timers
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* Ref: 3GPP TS 36.322 v10.0.0 Section 7
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***************************************************************************/
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srsran::timer_handler::unique_timer reordering_timer;
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srsran::rolling_average<double> sdu_rx_latency_ms;
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};
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} // namespace srsran
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#endif // SRSRAN_RLC_AM_LTE_H
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