Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
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osmo-pcu/src/tbf_ul_ack_fsm.h

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/* tbf_ul_ack_fsm.h
*
* Copyright (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* Author: Pau Espin Pedrol <pespin@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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* 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
#include <osmocom/core/fsm.h>
#include <osmocom/core/tdef.h>
#include <gprs_pcu.h>
struct gprs_rlcmac_tbf;
struct gprs_rlcmac_ul_tbf;
enum tbf_ul_ack_fsm_event {
TBF_UL_ACK_EV_SCHED_ACK, /* Tx UL ACK/NACK is pending */
TBF_UL_ACK_EV_CREATE_RLCMAC_MSG, /* Scheduler wants to gen+Tx the Ass (rej): data=tbf_ul_ack_ev_create_rlcmac_msg_ctx */
TBF_UL_ACK_EV_RX_CTRL_ACK, /* Received CTRL ACK answering poll set on UL ACK/NACK */
TBF_UL_ACK_EV_POLL_TIMEOUT, /* Pdch Ul Controller signals timeout for poll set on UL ACK/NACK */
};
enum tbf_ul_ack_fsm_states {
TBF_UL_ACK_ST_NONE = 0,
TBF_UL_ACK_ST_SCHED_UL_ACK, /* send UL ACK/NACK on next RTS */
TBF_UL_ACK_ST_WAIT_ACK, /* wait for PACKET CONTROL ACK */
};
struct tbf_ul_ack_fsm_ctx {
struct osmo_fsm_inst *fi;
struct gprs_rlcmac_ul_tbf *tbf; /* back pointer */
};
extern const struct osmo_tdef_state_timeout tbf_ul_ack_fsm_timeouts[32];
/* Transition to a state, using the T timer defined in tbf_ul_ack_fsm_timeouts.
* The actual timeout value is in turn obtained from conn->T_defs.
* Assumes local variable fi exists. */
#define tbf_ul_ack_fsm_state_chg(fi, NEXT_STATE) \
osmo_tdef_fsm_inst_state_chg(fi, NEXT_STATE, \
tbf_ul_ack_fsm_timeouts, \
the_pcu->T_defs, \
-1)
extern struct osmo_fsm tbf_ul_ack_fsm;
/* passed as data in TBF_UL_ACK_EV_CREATE_RLCMAC_MSG */
struct tbf_ul_ack_ev_create_rlcmac_msg_ctx {
uint32_t fn; /* FN where the created DL ctrl block is to be sent */
uint8_t ts; /* TS where the created DL ctrl block is to be sent */
struct msgb *msg; /* to be filled by FSM during event processing */
};
struct msgb *tbf_ul_ack_create_rlcmac_msg(const struct gprs_rlcmac_tbf *tbf, uint32_t fn, uint8_t ts);
bool tbf_ul_ack_rts(const struct gprs_rlcmac_tbf *tbf);
bool tbf_ul_ack_waiting_cnf_final_ack(const struct gprs_rlcmac_tbf *tbf);
bool tbf_ul_ack_exp_ctrl_ack(const struct gprs_rlcmac_tbf *tbf, uint32_t fn, uint8_t ts);