| /* TS 23.060 ยง 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); |
| } |