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82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
/**
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* This file is part of srsRAN.
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*
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* srsRAN 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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* srsRAN 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 SRSUE_BEARER_MANAGER_H
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#define SRSUE_BEARER_MANAGER_H
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#include "srsran/common/common.h"
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#include "srsran/common/rwlock_guard.h"
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#include "srsran/srslog/srslog.h"
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#include <map>
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#include <stdint.h>
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namespace srsue {
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/**
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* @brief Helper class to manage the mapping between EPS bearer and radio bearer
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*
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* The class maps EPS bearers that are known to NAS and GW and radio bearer (RB) that
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* are only known to RRC. Since the lifetime of a EPS bearer is usually longer
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* than the lifetime of a RB, the GW needs to query the Stack to check whether a
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* given EPS bearer is active, i.e. a DRB is established, or not.
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*
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* The class also maps between RATs since each LCID can exist on either EUTRA or NR RATs, or both.
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*
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* Since the access of this class is happening from two different threads (GW+RRC/Stack)
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* it's public interface is protected.
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*
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*/
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class bearer_manager
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{
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public:
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bearer_manager();
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~bearer_manager();
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// RRC interface
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/// Registers EPS bearer with PDCP RAT type and LCID
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void add_eps_bearer(uint8_t eps_bearer_id, srsran::srsran_rat_t rat, uint32_t lcid);
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/// Single EPS bearer is removed from map when the associated DRB is deleted
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void remove_eps_bearer(uint8_t eps_bearer_id);
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/// All registered bearer are removed (e.g. after connection release)
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void reset();
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// GW interface
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bool has_active_radio_bearer(uint32_t eps_bearer_id);
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// Stack interface to retrieve active RB
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struct radio_bearer_t {
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srsran::srsran_rat_t rat;
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uint32_t lcid;
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};
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radio_bearer_t& get_radio_bearer(uint32_t eps_bearer_id);
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private:
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pthread_rwlock_t rwlock = {}; /// RW lock to protect access from RRC/GW threads
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srslog::basic_logger& logger;
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std::map<uint32_t, radio_bearer_t> eps_rb_map;
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radio_bearer_t invalid_rb = {srsran::srsran_rat_t::nulltype, 0};
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};
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} // namespace srsue
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#endif // SRSUE_BEARER_MANAGER_H
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