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231 lines
7.6 KiB
C++
231 lines
7.6 KiB
C++
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsUE library.
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*
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* srsUE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsUE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#ifndef RLC_AM_H
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#define RLC_AM_H
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#include "common/buffer_pool.h"
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#include "common/log.h"
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#include "common/common.h"
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#include "common/interfaces.h"
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#include "common/msg_queue.h"
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#include "common/timeout.h"
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#include "upper/rlc_common.h"
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#include <map>
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#include <deque>
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#include <list>
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using srslte::byte_buffer_t;
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namespace srsue {
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struct rlc_amd_rx_pdu_t{
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rlc_amd_pdu_header_t header;
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byte_buffer_t *buf;
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};
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struct rlc_amd_rx_pdu_segments_t{
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std::list<rlc_amd_rx_pdu_t> segments;
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};
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struct rlc_amd_tx_pdu_t{
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rlc_amd_pdu_header_t header;
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byte_buffer_t *buf;
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uint32_t retx_count;
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bool is_acked;
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};
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struct rlc_amd_retx_t{
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uint32_t sn;
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bool is_segment;
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uint32_t so_start;
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uint32_t so_end;
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};
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class rlc_am
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:public rlc_common
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{
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public:
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rlc_am();
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void init(srslte::log *rlc_entity_log_,
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uint32_t lcid_,
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pdcp_interface_rlc *pdcp_,
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rrc_interface_rlc *rrc_,
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srslte::mac_interface_timers *mac_timers);
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void configure(LIBLTE_RRC_RLC_CONFIG_STRUCT *cnfg);
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void reset();
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void empty_queue();
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rlc_mode_t get_mode();
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uint32_t get_bearer();
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// PDCP interface
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void write_sdu(byte_buffer_t *sdu);
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// MAC interface
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uint32_t get_buffer_state();
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uint32_t get_total_buffer_state();
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int read_pdu(uint8_t *payload, uint32_t nof_bytes);
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void write_pdu(uint8_t *payload, uint32_t nof_bytes);
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private:
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srslte::byte_buffer_pool *pool;
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srslte::log *log;
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uint32_t lcid;
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pdcp_interface_rlc *pdcp;
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rrc_interface_rlc *rrc;
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// TX SDU buffers
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srslte::msg_queue tx_sdu_queue;
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byte_buffer_t *tx_sdu;
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// PDU being resegmented
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rlc_amd_tx_pdu_t tx_pdu_segments;
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// Tx and Rx windows
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std::map<uint32_t, rlc_amd_tx_pdu_t> tx_window;
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std::deque<rlc_amd_retx_t> retx_queue;
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std::map<uint32_t, rlc_amd_rx_pdu_t> rx_window;
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std::map<uint32_t, rlc_amd_rx_pdu_segments_t> rx_segments;
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// RX SDU buffers
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byte_buffer_t *rx_sdu;
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// Mutexes
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pthread_mutex_t mutex;
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bool poll_received;
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bool do_status;
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rlc_status_pdu_t status;
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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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// TX configs
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int32_t t_poll_retx; // Poll retx timeout (ms)
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int32_t poll_pdu; // Insert poll bit after this many PDUs
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int32_t poll_byte; // Insert poll bit after this much data (KB)
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int32_t max_retx_thresh; // Max number of retx
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// RX configs
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int32_t t_reordering; // Timer used by rx to detect PDU loss (ms)
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int32_t t_status_prohibit; // Timer used by rx to prohibit tx of status PDU (ms)
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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; // ACK state. SN of next PDU in sequence to be ACKed. Low edge of tx window.
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uint32_t vt_ms; // Max send state. High edge of tx window. vt_a + window_size.
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uint32_t vt_s; // Send state. SN to be assigned for next PDU.
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uint32_t poll_sn; // 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;
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uint32_t byte_without_poll;
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// Rx state variables
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uint32_t vr_r; // Receive state. SN following last in-sequence received PDU. Low edge of rx window
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uint32_t vr_mr; // Max acceptable receive state. High edge of rx window. vr_r + window size.
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uint32_t vr_x; // t_reordering state. SN following PDU which triggered t_reordering.
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uint32_t vr_ms; // Max status tx state. Highest possible value of SN for ACK_SN in status PDU.
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uint32_t vr_h; // Highest rx state. SN following PDU with highest SN among rxed PDUs.
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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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srslte::timeout poll_retx_timeout;
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srslte::timeout reordering_timeout;
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srslte::timeout status_prohibit_timeout;
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static const int reordering_timeout_id = 1;
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// Timer checks
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bool status_prohibited();
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bool poll_retx();
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void check_reordering_timeout();
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// Helpers
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bool poll_required();
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int prepare_status();
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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 handle_data_pdu(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 handle_control_pdu(uint8_t *payload, uint32_t nof_bytes);
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void reassemble_rx_sdus();
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bool inside_tx_window(uint16_t sn);
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bool inside_rx_window(uint16_t sn);
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void debug_state();
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bool add_segment_and_check(rlc_amd_rx_pdu_segments_t *pdu, rlc_amd_rx_pdu_t *segment);
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int required_buffer_size(rlc_amd_retx_t retx);
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bool retx_queue_has_sn(uint32_t sn);
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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_am_read_data_pdu_header(byte_buffer_t *pdu, rlc_amd_pdu_header_t *header);
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void rlc_am_read_data_pdu_header(uint8_t **payload, uint32_t *nof_bytes, rlc_amd_pdu_header_t *header);
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void rlc_am_write_data_pdu_header(rlc_amd_pdu_header_t *header, byte_buffer_t *pdu);
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void rlc_am_write_data_pdu_header(rlc_amd_pdu_header_t *header, uint8_t **payload);
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void rlc_am_read_status_pdu(byte_buffer_t *pdu, rlc_status_pdu_t *status);
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void rlc_am_read_status_pdu(uint8_t *payload, uint32_t nof_bytes, rlc_status_pdu_t *status);
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void rlc_am_write_status_pdu(rlc_status_pdu_t *status, byte_buffer_t *pdu );
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int rlc_am_write_status_pdu(rlc_status_pdu_t *status, uint8_t *payload);
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uint32_t rlc_am_packed_length(rlc_amd_pdu_header_t *header);
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uint32_t rlc_am_packed_length(rlc_status_pdu_t *status);
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uint32_t rlc_am_packed_length(rlc_amd_retx_t retx);
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bool rlc_am_is_control_pdu(byte_buffer_t *pdu);
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bool rlc_am_is_control_pdu(uint8_t *payload);
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bool rlc_am_is_pdu_segment(uint8_t *payload);
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std::string rlc_am_to_string(rlc_status_pdu_t *status);
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bool rlc_am_start_aligned(uint8_t fi);
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bool rlc_am_end_aligned(uint8_t fi);
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} // namespace srsue
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#endif // RLC_AM_H
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