/** * * \section COPYRIGHT * * Copyright 2013-2015 Software Radio Systems Limited * * \section LICENSE * * This file is part of the srsUE library. * * srsUE is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as * published by the Free Software Foundation, either version 3 of * the License, or (at your option) any later version. * * srsUE is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * A copy of the GNU Affero General Public License can be found in * the LICENSE file in the top-level directory of this distribution * and at http://www.gnu.org/licenses/. * */ #ifndef SRSLTE_RLC_UM_H #define SRSLTE_RLC_UM_H #include "srslte/common/buffer_pool.h" #include "srslte/common/log.h" #include "srslte/common/common.h" #include "srslte/interfaces/ue_interfaces.h" #include "srslte/upper/rlc_tx_queue.h" #include "srslte/upper/rlc_common.h" #include #include #include namespace srslte { struct rlc_umd_pdu_t{ rlc_umd_pdu_header_t header; byte_buffer_t *buf; }; class rlc_um :public rlc_common { public: rlc_um(); ~rlc_um(); void init(log *rlc_entity_log_, uint32_t lcid_, srsue::pdcp_interface_rlc *pdcp_, srsue::rrc_interface_rlc *rrc_, mac_interface_timers *mac_timers_); bool configure(srslte_rlc_config_t cnfg); void reestablish(); void stop(); void empty_queue(); bool is_mrb(); rlc_mode_t get_mode(); uint32_t get_bearer(); // PDCP interface void write_sdu(byte_buffer_t *sdu, bool blocking = true); // MAC interface bool has_data(); uint32_t get_buffer_state(); int read_pdu(uint8_t *payload, uint32_t nof_bytes); void write_pdu(uint8_t *payload, uint32_t nof_bytes); int get_increment_sequence_num(); uint32_t get_num_tx_bytes(); uint32_t get_num_rx_bytes(); void reset_metrics(); private: // Transmitter sub-class class rlc_um_tx { public: rlc_um_tx(); ~rlc_um_tx(); void init(srslte::log *log_); bool configure(srslte_rlc_config_t cfg, std::string rb_name); int build_data_pdu(uint8_t *payload, uint32_t nof_bytes); void stop(); void reestablish(); void empty_queue(); void write_sdu(byte_buffer_t *sdu); void try_write_sdu(byte_buffer_t *sdu); uint32_t get_num_tx_bytes(); void reset_metrics(); bool has_data(); uint32_t get_buffer_state(); private: byte_buffer_pool *pool; srslte::log *log; std::string rb_name; /**************************************************************************** * Configurable parameters * Ref: 3GPP TS 36.322 v10.0.0 Section 7 ***************************************************************************/ srslte_rlc_um_config_t cfg; // TX SDU buffers rlc_tx_queue tx_sdu_queue; byte_buffer_t *tx_sdu; /**************************************************************************** * State variables and counters * Ref: 3GPP TS 36.322 v10.0.0 Section 7 ***************************************************************************/ uint32_t vt_us; // Send state. SN to be assigned for next PDU. // Mutexes pthread_mutex_t mutex; bool tx_enabled; uint32_t num_tx_bytes; // helper functions void debug_state(); const char* get_rb_name(); }; // Receiver sub-class class rlc_um_rx : public timer_callback { public: rlc_um_rx(); ~rlc_um_rx(); void init(srslte::log *log_, uint32_t lcid_, srsue::pdcp_interface_rlc *pdcp_, srsue::rrc_interface_rlc *rrc_, srslte::mac_interface_timers *mac_timers_); void stop(); void reestablish(); bool configure(srslte_rlc_config_t cfg, std::string rb_name); void handle_data_pdu(uint8_t *payload, uint32_t nof_bytes); void reassemble_rx_sdus(); bool pdu_belongs_to_rx_sdu(); bool inside_reordering_window(uint16_t sn); uint32_t get_num_rx_bytes(); void reset_metrics(); // Timeout callback interface void timer_expired(uint32_t timeout_id); private: void reset(); byte_buffer_pool *pool; srslte::log *log; mac_interface_timers *mac_timers; std::string rb_name; /**************************************************************************** * Configurable parameters * Ref: 3GPP TS 36.322 v10.0.0 Section 7 ***************************************************************************/ srslte_rlc_um_config_t cfg; // Rx window std::map rx_window; // RX SDU buffers byte_buffer_t *rx_sdu; uint32_t vr_ur_in_rx_sdu; // Rx state variables and counter uint32_t vr_ur; // Receive state. SN of earliest PDU still considered for reordering. uint32_t vr_ux; // t_reordering state. SN following PDU which triggered t_reordering. uint32_t vr_uh; // Highest rx state. SN following PDU with highest SN among rxed PDUs. bool pdu_lost; uint32_t num_rx_bytes; // Upper layer handles and variables srsue::pdcp_interface_rlc *pdcp; srsue::rrc_interface_rlc *rrc; uint32_t lcid; // Mutexes pthread_mutex_t mutex; bool rx_enabled; /**************************************************************************** * Timers * Ref: 3GPP TS 36.322 v10.0.0 Section 7 ***************************************************************************/ srslte::timers::timer *reordering_timer; uint32_t reordering_timer_id; // helper functions void debug_state(); const char* get_rb_name(); }; // Rx and Tx objects rlc_um_tx tx; rlc_um_rx rx; // Common variables needed by parent class srsue::rrc_interface_rlc *rrc; srslte::log *log; uint32_t lcid; srslte_rlc_um_config_t cfg; std::string rb_name; byte_buffer_pool *pool; std::string get_rb_name(srsue::rrc_interface_rlc *rrc, uint32_t lcid, bool is_mrb); }; /**************************************************************************** * Header pack/unpack helper functions * Ref: 3GPP TS 36.322 v10.0.0 Section 6.2.1 ***************************************************************************/ void rlc_um_read_data_pdu_header(byte_buffer_t *pdu, rlc_umd_sn_size_t sn_size, rlc_umd_pdu_header_t *header); void rlc_um_read_data_pdu_header(uint8_t *payload, uint32_t nof_bytes, rlc_umd_sn_size_t sn_size, rlc_umd_pdu_header_t *header); void rlc_um_write_data_pdu_header(rlc_umd_pdu_header_t *header, byte_buffer_t *pdu); uint32_t rlc_um_packed_length(rlc_umd_pdu_header_t *header); bool rlc_um_start_aligned(uint8_t fi); bool rlc_um_end_aligned(uint8_t fi); } // namespace srsue #endif // SRSLTE_RLC_UM_H