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/* TS 23.060 § 6.1.1 Mobility Management States (A/Gb mode) */
/*
* (C) 2019 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* SPDX-License-Identifier: AGPL-3.0+
*
* 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 Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <osmocom/core/tdef.h>
#include <osmocom/sgsn/gprs_mm_state_gb_fsm.h>
#include <osmocom/sgsn/gprs_llc.h>
#include <osmocom/sgsn/debug.h>
#include <osmocom/sgsn/sgsn.h>
#define X(s) (1 << (s))
static const struct osmo_tdef_state_timeout mm_state_gb_fsm_timeouts[32] = {
[ST_MM_IDLE] = { },
[ST_MM_READY] = { .T=3314 },
[ST_MM_STANDBY] = { },
};
#define mm_state_gb_fsm_state_chg(fi, NEXT_STATE) \
osmo_tdef_fsm_inst_state_chg(fi, NEXT_STATE, mm_state_gb_fsm_timeouts, sgsn->cfg.T_defs, -1)
static void st_mm_idle_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state) {
struct sgsn_mm_ctx *ctx = fi->priv;
/* FIXME: remove this timer when RAU has it's own fsm */
if (ctx->T == 3350 && osmo_timer_pending(&ctx->timer))
osmo_timer_del(&ctx->timer);
if (ctx->gb.llme) {
gprs_llgmm_unassign(ctx->gb.llme);
ctx->gb.llme = NULL;
}
}
static void st_mm_idle(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
switch(event) {
case E_MM_GPRS_ATTACH:
mm_state_gb_fsm_state_chg(fi, ST_MM_READY);
break;
case E_MM_PDU_RECEPTION:
break;
}
}
static void st_mm_ready(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
unsigned long t_secs;
switch(event) {
case E_MM_READY_TIMER_EXPIRY:
mm_state_gb_fsm_state_chg(fi, ST_MM_STANDBY);
break;
case E_MM_GPRS_DETACH:
mm_state_gb_fsm_state_chg(fi, ST_MM_IDLE);
break;
case E_MM_PDU_RECEPTION:
/* RE-arm the READY timer upon receival of Gb PDUs */
t_secs = osmo_tdef_get(sgsn->cfg.T_defs, 3314, OSMO_TDEF_S, -1);
osmo_timer_schedule(&fi->timer, t_secs, 0);
break;
case E_MM_RA_UPDATE:
break;
}
}
static void st_mm_standby(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
switch(event) {
case E_MM_PDU_RECEPTION:
mm_state_gb_fsm_state_chg(fi, ST_MM_READY);
break;
case E_MM_GPRS_DETACH:
mm_state_gb_fsm_state_chg(fi, ST_MM_IDLE);
break;
}
}
static struct osmo_fsm_state mm_state_gb_fsm_states[] = {
[ST_MM_IDLE] = {
.in_event_mask = X(E_MM_GPRS_ATTACH) | X(E_MM_PDU_RECEPTION),
.out_state_mask = X(ST_MM_READY),
.onenter = st_mm_idle_on_enter,
.name = "Idle",
.action = st_mm_idle,
},
[ST_MM_READY] = {
.in_event_mask = X(E_MM_READY_TIMER_EXPIRY) | X(E_MM_RA_UPDATE) | X(E_MM_GPRS_DETACH) | X(E_MM_PDU_RECEPTION),
.out_state_mask = X(ST_MM_IDLE) | X(ST_MM_STANDBY),
.name = "Ready",
.action = st_mm_ready,
},
[ST_MM_STANDBY] = {
.in_event_mask = X(E_MM_PDU_RECEPTION) | X(E_MM_GPRS_DETACH),
.out_state_mask = X(ST_MM_IDLE) | X(ST_MM_READY),
.name = "Standby",
.action = st_mm_standby,
},
};
const struct value_string mm_state_gb_fsm_event_names[] = {
OSMO_VALUE_STRING(E_MM_GPRS_ATTACH),
OSMO_VALUE_STRING(E_MM_PDU_RECEPTION),
OSMO_VALUE_STRING(E_MM_GPRS_DETACH),
OSMO_VALUE_STRING(E_MM_READY_TIMER_EXPIRY),
OSMO_VALUE_STRING(E_MM_RA_UPDATE),
{ 0, NULL }
};
int mm_state_gb_fsm_timer_cb(struct osmo_fsm_inst *fi)
{
switch(fi->state) {
case ST_MM_READY:
/* timer for mm state. state=READY: T3314 (aka TS 23.060 "READY timer") */
osmo_fsm_inst_dispatch(fi, E_MM_READY_TIMER_EXPIRY, NULL);
break;
}
return 0;
}
struct osmo_fsm mm_state_gb_fsm = {
.name = "MM_STATE_Gb",
.states = mm_state_gb_fsm_states,
.num_states = ARRAY_SIZE(mm_state_gb_fsm_states),
.event_names = mm_state_gb_fsm_event_names,
.log_subsys = DMM,
.timer_cb = mm_state_gb_fsm_timer_cb,
};
static __attribute__((constructor)) void mm_state_gb_fsm_init(void)
{
OSMO_ASSERT(osmo_fsm_register(&mm_state_gb_fsm) == 0);
}
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