mirror of https://github.com/PentHertz/srsLTE.git
129 lines
3.9 KiB
C++
129 lines
3.9 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_UM_LTE_H
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#define SRSRAN_RLC_UM_LTE_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/upper/byte_buffer_queue.h"
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#include "srsran/upper/rlc_um_base.h"
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#include <map>
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#include <mutex>
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#include <pthread.h>
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#include <queue>
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namespace srsran {
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typedef struct {
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rlc_umd_pdu_header_t header;
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unique_byte_buffer_t buf;
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} rlc_umd_pdu_t;
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class rlc_um_lte : public rlc_um_base
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{
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public:
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rlc_um_lte(srslog::basic_logger& logger,
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uint32_t lcid_,
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srsue::pdcp_interface_rlc* pdcp_,
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srsue::rrc_interface_rlc* rrc_,
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srsran::timer_handler* timers_);
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~rlc_um_lte();
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bool configure(const rlc_config_t& cnfg);
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private:
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// Transmitter sub-class for LTE
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class rlc_um_lte_tx : public rlc_um_base_tx
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{
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public:
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rlc_um_lte_tx(rlc_um_base* parent_);
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bool configure(const rlc_config_t& cfg, std::string rb_name);
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uint32_t build_data_pdu(unique_byte_buffer_t pdu, uint8_t* payload, uint32_t nof_bytes);
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uint32_t get_buffer_state();
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bool sdu_queue_is_full();
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private:
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void reset();
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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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uint32_t vt_us = 0; // Send state. SN to be assigned for next PDU.
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// Metrics
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void debug_state();
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};
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// Receiver sub-class for LTE
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class rlc_um_lte_rx : public rlc_um_base_rx
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{
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public:
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rlc_um_lte_rx(rlc_um_base* parent_);
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~rlc_um_lte_rx();
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void stop();
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void reestablish();
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bool configure(const rlc_config_t& cnfg_, std::string rb_name_);
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void handle_data_pdu(uint8_t* payload, uint32_t nof_bytes);
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void reassemble_rx_sdus();
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bool pdu_belongs_to_rx_sdu();
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bool inside_reordering_window(uint16_t sn);
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// Timeout callback interface
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void timer_expired(uint32_t timeout_id);
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private:
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void reset();
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// Rx window
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std::map<uint32_t, rlc_umd_pdu_t> rx_window;
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// RX SDU buffers
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uint32_t vr_ur_in_rx_sdu = 0;
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// Rx state variables and counter
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uint32_t vr_ur = 0; // Receive state. SN of earliest PDU still considered for reordering.
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uint32_t vr_ux = 0; // t_reordering state. SN following PDU which triggered t_reordering.
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uint32_t vr_uh = 0; // Highest rx state. SN following PDU with highest SN among rxed PDUs.
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bool pdu_lost = false;
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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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// helper functions
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void debug_state();
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};
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};
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/****************************************************************************
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* Header pack/unpack helper functions
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* Ref: 3GPP TS 36.322 v10.0.0 Section 6.2.1
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***************************************************************************/
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void rlc_um_read_data_pdu_header(byte_buffer_t* pdu, rlc_umd_sn_size_t sn_size, rlc_umd_pdu_header_t* header);
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void rlc_um_read_data_pdu_header(uint8_t* payload,
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uint32_t nof_bytes,
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rlc_umd_sn_size_t sn_size,
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rlc_umd_pdu_header_t* header);
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void rlc_um_write_data_pdu_header(rlc_umd_pdu_header_t* header, byte_buffer_t* pdu);
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uint32_t rlc_um_packed_length(rlc_umd_pdu_header_t* header);
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bool rlc_um_start_aligned(uint8_t fi);
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bool rlc_um_end_aligned(uint8_t fi);
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} // namespace srsran
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#endif // SRSRAN_RLC_UM_LTE_H
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