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149 lines
4.4 KiB
C++
149 lines
4.4 KiB
C++
/*
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* Copyright 2013-2019 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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*
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* srsLTE 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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* srsLTE 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 SRSLTE_PDCP_ENTITY_NR_H
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#define SRSLTE_PDCP_ENTITY_NR_H
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#include "pdcp_entity_base.h"
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#include "srslte/common/buffer_pool.h"
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#include "srslte/common/common.h"
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#include "srslte/common/interfaces_common.h"
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#include "srslte/common/log.h"
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#include "srslte/common/security.h"
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#include "srslte/common/threads.h"
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#include <map>
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namespace srslte {
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/****************************************************************************
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* NR PDCP Entity
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* PDCP entity for 5G NR
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***************************************************************************/
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class pdcp_entity_nr : public pdcp_entity_base
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{
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public:
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pdcp_entity_nr(srsue::rlc_interface_pdcp* rlc_,
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srsue::rrc_interface_pdcp* rrc_,
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srsue::gw_interface_pdcp* gw_,
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srslte::timer_handler* timers_,
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srslte::log* log_);
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~pdcp_entity_nr();
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void init(uint32_t lcid_, pdcp_config_t cfg_);
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void reset();
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void reestablish();
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// RRC interface
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void write_sdu(unique_byte_buffer_t sdu, bool blocking);
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// RLC interface
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void write_pdu(unique_byte_buffer_t pdu);
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// State variable setters (should be used only for testing)
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void set_tx_next(uint32_t tx_next_) { tx_next = tx_next_; }
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void set_rx_next(uint32_t rx_next_) { rx_next = rx_next_; }
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void set_rx_deliv(uint32_t rx_deliv_) { rx_deliv = rx_deliv_; }
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void set_rx_reord(uint32_t rx_reord_) { rx_reord = rx_reord_; }
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// State variable getters (useful for testing)
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uint32_t nof_discard_timers() { return discard_timers_map.size(); }
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private:
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bool initialized = false;
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srsue::rlc_interface_pdcp* rlc = nullptr;
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srsue::rrc_interface_pdcp* rrc = nullptr;
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srsue::gw_interface_pdcp* gw = nullptr;
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// State variables: 3GPP TS 38.323 v15.2.0, section 7.1
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uint32_t tx_next = 0; // COUNT value of next SDU to be transmitted.
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uint32_t rx_next = 0; // COUNT value of next SDU expected to be received.
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uint32_t rx_deliv = 0; // COUNT value of first SDU not delivered to upper layers, but still waited for.
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uint32_t rx_reord = 0; // COUNT value following the COUNT value of PDCP Data PDU which triggered t-Reordering.
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// Constants: 3GPP TS 38.323 v15.2.0, section 7.2
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uint32_t window_size = 0;
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// Reordering Queue / Timers
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std::map<uint32_t, unique_byte_buffer_t> reorder_queue;
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timer_handler::unique_timer reordering_timer;
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// Pass to Upper Layers Helper function
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void deliver_all_consecutive_counts();
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void pass_to_upper_layers(unique_byte_buffer_t pdu);
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// Reodering callback (t-Reordering)
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class reordering_callback;
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std::unique_ptr<reordering_callback> reordering_fnc;
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// Discard callback (discardTimer)
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class discard_callback;
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std::map<uint32_t, timer_handler::unique_timer> discard_timers_map;
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// COUNT overflow protection
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bool tx_overflow = false;
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bool rx_overflow = false;
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};
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/*
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* Timer callbacks
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*/
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// Reordering callback (t-Reordering)
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class pdcp_entity_nr::reordering_callback
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{
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public:
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reordering_callback(pdcp_entity_nr* parent_) { parent = parent_; };
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void operator()(uint32_t timer_id);
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private:
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pdcp_entity_nr* parent;
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};
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// Discard callback (discardTimer)
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class pdcp_entity_nr::discard_callback
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{
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public:
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discard_callback(pdcp_entity_nr* parent_, uint32_t sn_)
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{
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parent = parent_;
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discard_sn = sn_;
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};
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void operator()(uint32_t timer_id);
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private:
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pdcp_entity_nr* parent;
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uint32_t discard_sn;
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};
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/*
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* Helpers
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*/
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inline void pdcp_entity_nr::pass_to_upper_layers(unique_byte_buffer_t sdu)
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{
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if (is_srb()) {
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rrc->write_pdu(lcid, std::move(sdu));
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} else {
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gw->write_pdu(lcid, std::move(sdu));
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}
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}
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} // namespace srslte
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#endif // SRSLTE_PDCP_ENTITY_NR_H
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