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/nacc_fsm.h

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/* nacc_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/gsm/gsm23003.h>
#include <neigh_cache.h>
struct GprsMs;
struct gprs_rlcmac_tbf;
enum nacc_fsm_event {
NACC_EV_RX_CELL_CHG_NOTIFICATION, /* data: Packet_Cell_Change_Notification_t* */
NACC_EV_RX_RAC_CI, /* RAC_CI became available in neigh_cache. NULL on failure, pointer to ctx->cgi_ps on success */
NACC_EV_RX_SI, /* data: struct si_cache_entry* */
NACC_EV_CREATE_RLCMAC_MSG, /* data: struct nacc_ev_create_rlcmac_msg_ctx* */
NACC_EV_RX_CELL_CHG_CONTINUE_ACK,
NACC_EV_TIMEOUT_CELL_CHG_CONTINUE, /* Poll Timeout */
};
enum nacc_fsm_states {
NACC_ST_INITIAL,
NACC_ST_WAIT_RESOLVE_RAC_CI,
NACC_ST_WAIT_REQUEST_SI,
NACC_ST_TX_NEIGHBOUR_DATA,
NACC_ST_TX_CELL_CHG_CONTINUE,
NACC_ST_WAIT_CELL_CHG_CONTINUE_ACK,
NACC_ST_DONE,
};
struct nacc_fsm_ctx {
struct osmo_fsm_inst *fi;
struct GprsMs* ms; /* back pointer */
struct ctrl_handle *neigh_ctrl;
struct ctrl_connection *neigh_ctrl_conn;
struct neigh_cache_entry_key neigh_key; /* target cell info from MS */
struct osmo_cell_global_id_ps cgi_ps; /* target cell info resolved from req_{arfcn+bsic} */
struct si_cache_value si_info; /* SI info resolved from SGSN, to be sent to MS */
size_t si_info_bytes_sent; /* How many bytes out of si_info->si_len were already sent to MS */
size_t container_idx; /* Next container_idx to assign when sending Packet Neighbor Data message */
uint32_t continue_poll_fn; /* Scheduled poll FN to CTRL ACK the Pkt Cell Chg Continue */
uint8_t continue_poll_ts; /* Scheduled poll TS to CTRL ACK the Pkt Cell Chg Continue */
};
/* passed as data in NACC_EV_CREATE_RLCMAC_MSG */
struct nacc_ev_create_rlcmac_msg_ctx {
struct gprs_rlcmac_tbf *tbf; /* target tbf to create messages for */
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 nacc_fsm_ctx *nacc_fsm_alloc(struct GprsMs* ms);
bool nacc_fsm_is_waiting_addr_resolution(const struct nacc_fsm_ctx *ctx,
const struct neigh_cache_entry_key *neigh_key);
bool nacc_fsm_is_waiting_si_resolution(const struct nacc_fsm_ctx *ctx,
const struct osmo_cell_global_id_ps *cgi_ps);
bool nacc_fsm_exp_ctrl_ack(const struct nacc_fsm_ctx *ctx, uint32_t fn, uint8_t ts);