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_fsm.h

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/* tbf_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;
enum tbf_fsm_event {
TBF_EV_ASSIGN_ADD_CCCH, /* An assignment is sent over CCCH and confirmation from MS is pending */
TBF_EV_ASSIGN_ADD_PACCH, /* An assignment is sent over PACCH and confirmation from MS is pending */
TBF_EV_ASSIGN_ACK_PACCH, /* We received a CTRL ACK confirming assignment started on PACCH */
TBF_EV_ASSIGN_READY_CCCH, /* TBF Start Time timer triggered */
TBF_EV_ASSIGN_PCUIF_CNF, /* Transmission of IMM.ASS for DL TBF to the MS confirmed by BTS over PCUIF */
TBF_EV_DL_ACKNACK_MISS, /* DL TBF: We polled for DL ACK/NACK but we received none (POLL timeout) */
TBF_EV_LAST_DL_DATA_SENT, /* DL TBF sends RLCMAC block containing last DL avilable data buffered */
TBF_EV_LAST_UL_DATA_RECVD, /* UL TBF sends RLCMAC block containing last UL data (cv=0) */
TBF_EV_FINAL_ACK_RECVD, /* DL ACK/NACK with FINAL_ACK=1 received from MS */
TBF_EV_FINAL_UL_ACK_CONFIRMED, /* UL TBF: MS ACKs (CtrlAck or PktResReq) our UL ACK/NACK w/ FinalAckInd=1 */
TBF_EV_MAX_N3101, /* MAX N3101 (max usf timeout) reached (UL TBF) */
TBF_EV_MAX_N3103, /* MAX N3103 (max Pkt Ctrl Ack for last UL ACK/NACK timeout) reached (UL TBF) */
TBF_EV_MAX_N3105, /* MAX N3105 (max poll timeout) reached (UL/DL TBF) */
};
enum tbf_fsm_states {
TBF_ST_NEW = 0, /* new created TBF */
TBF_ST_ASSIGN, /* wait for downlink assignment */
TBF_ST_FLOW, /* RLC/MAC flow, resource needed */
TBF_ST_FINISHED, /* flow finished, wait for release */
TBF_ST_WAIT_RELEASE,/* wait for release or restart of DL TBF */
TBF_ST_RELEASING, /* releasing, wait to free TBI/USF */
};
struct tbf_fsm_ctx {
struct osmo_fsm_inst *fi;
struct gprs_rlcmac_tbf* tbf; /* back pointer */
uint32_t state_flags;
unsigned int T_release; /* Timer to be used to end release: T3169 or T3195 */
};
extern const struct osmo_tdef_state_timeout tbf_fsm_timeouts[32];
/* Transition to a state, using the T timer defined in tbf_fsm_timeouts.
* The actual timeout value is in turn obtained from conn->T_defs.
* Assumes local variable fi exists. */
#define tbf_fsm_state_chg(fi, NEXT_STATE) \
osmo_tdef_fsm_inst_state_chg(fi, NEXT_STATE, \
tbf_fsm_timeouts, \
the_pcu->T_defs, \
-1)
extern struct osmo_fsm tbf_fsm;