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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.
*/
#pragma once
#include <osmocom/core/fsm.h>
#include <osmocom/core/tdef.h>
#include <gprs_pcu.h>
struct gprs_rlcmac_tbf;
enum tbf_fsm_event {
/* For both UL/DL TBF: */
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_MAX_N3105, /* MAX N3105 (max poll timeout) reached */
/* Only for DL TBF: */
TBF_EV_ASSIGN_READY_CCCH, /* TBF Start Time timer triggered */
TBF_EV_ASSIGN_PCUIF_CNF, /* Transmission of IMM.ASS for to the MS confirmed by BTS over PCUIF */
TBF_EV_DL_ACKNACK_MISS, /* We polled for DL ACK/NACK but we received none (POLL timeout) */
TBF_EV_LAST_DL_DATA_SENT, /* Network sends RLCMAC block containing last DL avilable data buffered */
TBF_EV_FINAL_ACK_RECVD, /* DL ACK/NACK with FINAL_ACK=1 received from MS */
/* Only for UL TBF: */
TBF_EV_FIRST_UL_DATA_RECVD, /* Received first UL data from MS. Equals to Contention Resolution completed on the network side */
TBF_EV_CONTENTION_RESOLUTION_MS_SUCCESS, /* Contention resolution success at the mobile station side (first UL_ACK_NACK confirming TLLI is received at the MS) */
TBF_EV_LAST_UL_DATA_RECVD, /* MS ends RLCMAC block containing last UL data (cv=0) */
TBF_EV_FINAL_UL_ACK_CONFIRMED, /* MS ACKs (CtrlAck or PktResReq) our UL ACK/NACK w/ FinalAckInd=1. data = (bool) MS requests establishment of a new UL-TBF. */
TBF_EV_MAX_N3101, /* MAX N3101 (max usf timeout) reached */
TBF_EV_MAX_N3103, /* MAX N3103 (max Pkt Ctrl Ack for last UL ACK/NACK timeout) reached */
};
extern const struct value_string tbf_fsm_event_names[];
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, /* DL TBF: wait for release or restart */
TBF_ST_WAIT_REUSE_TFI, /* DL TBF: wait to reuse TFI after last PKT ACK/NACK */
TBF_ST_RELEASING, /* releasing, wait to free TFI/USF */
};
struct tbf_dl_fsm_ctx {
union { /* back pointer. union used to easily access superclass from ctx */
struct gprs_rlcmac_tbf *tbf;
struct gprs_rlcmac_dl_tbf *dl_tbf;
};
uint32_t state_flags;
};
struct tbf_ul_fsm_ctx {
union { /* back pointer. union used to easily access superclass from ctx */
struct gprs_rlcmac_tbf *tbf;
struct gprs_rlcmac_ul_tbf *ul_tbf;
};
uint32_t state_flags;
};
extern struct osmo_fsm tbf_dl_fsm;
extern struct osmo_fsm tbf_ul_fsm;
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