Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
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* Copyright (C) 2013 by Holger Hans Peter Freyther
* Copyright (C) 2019 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#pragma once
#ifdef __cplusplus
#include "tbf.h"
#include <stdint.h>
* TBF instance
enum tbf_dl_prio {
DL_PRIO_SENT_DATA, /* the data has been sent and not (yet) nacked */
DL_PRIO_LOW_AGE, /* the age has reached the first threshold */
DL_PRIO_NEW_DATA, /* the data has not been sent yet or nacked */
DL_PRIO_HIGH_AGE, /* the age has reached the second threshold */
DL_PRIO_CONTROL, /* a control block needs to be sent */
struct gprs_rlcmac_dl_tbf : public gprs_rlcmac_tbf {
gprs_rlcmac_dl_tbf(struct gprs_rlcmac_bts *bts, GprsMs *ms);
gprs_rlc_window *window();
int append_data(uint16_t pdu_delay_csec,
const uint8_t *data, uint16_t len);
int rcvd_dl_ack(bool final_ack, unsigned first_bsn, struct bitvec *rbb);
struct msgb *create_dl_acked_block(uint32_t fn, uint8_t ts, enum mcs_kind req_mcs_kind = EGPRS);
void trigger_ass(struct gprs_rlcmac_tbf *old_tbf);
void request_dl_ack();
bool need_poll_for_dl_ack_nack() const;
bool have_data() const;
int frames_since_last_poll(unsigned fn) const;
int frames_since_last_drain(unsigned fn) const;
bool keep_open(unsigned fn) const;
int release();
uint16_t window_size() const;
void set_window_size();
void update_coding_scheme_counter_dl(enum CodingScheme cs);
struct msgb *llc_dequeue(bssgp_bvc_ctx *bctx);
/* Please note that all variables here will be reset when changing
* from WAIT RELEASE back to FLOW state (re-use of TBF).
* All states that need reset must be in this struct, so this is why
* variables are in both (dl and ul) structs and not outside union.
int32_t m_tx_counter; /* count all transmitted blocks */
bool m_dl_ack_requested;
int32_t m_last_dl_poll_fn;
int32_t m_last_dl_drained_fn;
struct BandWidth {
struct timespec dl_bw_tv; /* timestamp for dl bw calculation */
uint32_t dl_bw_octets; /* number of octets since bw_tv */
uint32_t dl_throughput; /* throughput to be displayed in stats */
struct timespec dl_loss_tv; /* timestamp for loss calculation */
uint16_t dl_loss_lost; /* sum of lost packets */
uint16_t dl_loss_received; /* sum of received packets */
} m_bw;
struct rate_ctr_group *m_dl_gprs_ctrs;
struct rate_ctr_group *m_dl_egprs_ctrs;
struct ana_result {
unsigned received_packets;
unsigned lost_packets;
unsigned received_bytes;
unsigned lost_bytes;
int take_next_bsn(uint32_t fn, int previous_bsn, enum mcs_kind req_mcs_kind,
bool *may_combine);
bool restart_bsn_cycle();
int create_new_bsn(const uint32_t fn, enum CodingScheme cs);
struct msgb *create_dl_acked_block(const uint32_t fn, const uint8_t ts,
int index, int index2 = -1);
int update_window(unsigned first_bsn, const struct bitvec *rbb);
int rcvd_dl_final_ack();
bool dl_window_stalled() const;
void reuse_tbf();
void start_llc_timer();
int analyse_errors(char *show_rbb, uint8_t ssn, ana_result *res);
void schedule_next_frame();
enum egprs_rlc_dl_reseg_bsn_state egprs_dl_get_data
(int bsn, uint8_t **block_data);
unsigned int get_egprs_dl_spb_status(int bsn);
enum egprs_rlcmac_dl_spb get_egprs_dl_spb(int bsn);
struct osmo_timer_list m_llc_timer;
/* Please note that all variables below will be reset when changing
* from WAIT RELEASE back to FLOW state (re-use of TBF).
* All states that need reset must be in this struct, so this is why
* variables are in both (dl and ul) structs and not outside union.
gprs_rlc_dl_window m_window;
inline uint16_t gprs_rlcmac_dl_tbf::window_size() const
return m_window.ws();
struct gprs_rlcmac_dl_tbf *tbf_alloc_dl_tbf(struct gprs_rlcmac_bts *bts, GprsMs *ms,
int8_t use_trx, bool single_slot);
#else /* ifdef __cplusplus */
struct gprs_rlcmac_dl_tbf;
#ifdef __cplusplus
extern "C" {
struct gprs_rlcmac_bts;
struct gprs_rlcmac_dl_tbf *as_dl_tbf(struct gprs_rlcmac_tbf *tbf);
/* dispatch Unitdata.DL messages */
int dl_tbf_handle(struct gprs_rlcmac_bts *bts,
const uint32_t tlli, const uint32_t old_tlli,
const char *imsi, const uint8_t ms_class,
const uint8_t egprs_ms_class, const uint16_t delay_csec,
const uint8_t *data, const uint16_t len);
void tbf_dl_trigger_ass(struct gprs_rlcmac_dl_tbf *tbf, struct gprs_rlcmac_tbf *old_tbf);
#define LOGPTBFDL(tbf, level, fmt, args...) LOGP(DTBFDL, level, "%s " fmt, tbf_name(tbf), ## args)
#ifdef __cplusplus