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/* (C) 2020 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* Authors: Philipp Maier, Neels Hofmeyr
*
* 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/fsm.h>
#include <osmocom/core/tdef.h>
#include <osmocom/bsc/debug.h>
#include <osmocom/bsc/bssmap_reset.h>
#include <osmocom/bsc/gsm_data.h>
static struct osmo_fsm bssmap_reset_fsm;
enum bssmap_reset_fsm_state {
BSSMAP_RESET_ST_DISC,
BSSMAP_RESET_ST_CONN,
};
static const struct value_string bssmap_reset_fsm_event_names[] = {
OSMO_VALUE_STRING(BSSMAP_RESET_EV_RX_RESET_ACK),
OSMO_VALUE_STRING(BSSMAP_RESET_EV_CONN_CFM_FAILURE),
OSMO_VALUE_STRING(BSSMAP_RESET_EV_CONN_CFM_SUCCESS),
{}
};
static const struct osmo_tdef_state_timeout bssmap_reset_timeouts[32] = {
[BSSMAP_RESET_ST_DISC] = { .T = 4 },
};
#define bssmap_reset_fsm_state_chg(FI, STATE) \
osmo_tdef_fsm_inst_state_chg(FI, STATE, \
bssmap_reset_timeouts, \
(bsc_gsmnet)->T_defs, \
5)
struct bssmap_reset *bssmap_reset_alloc(void *ctx, const char *label, const struct bssmap_reset_cfg *cfg)
{
struct bssmap_reset *bssmap_reset;
struct osmo_fsm_inst *fi;
fi = osmo_fsm_inst_alloc(&bssmap_reset_fsm, ctx, NULL, LOGL_DEBUG, label);
OSMO_ASSERT(fi);
bssmap_reset = talloc_zero(fi, struct bssmap_reset);
OSMO_ASSERT(bssmap_reset);
*bssmap_reset = (struct bssmap_reset){
.fi = fi,
.cfg = *cfg,
};
fi->priv = bssmap_reset;
/* Immediately (1ms) kick off reset sending mechanism */
osmo_fsm_inst_state_chg_ms(fi, BSSMAP_RESET_ST_DISC, 1, 0);
return bssmap_reset;
}
static void link_up(struct bssmap_reset *bssmap_reset)
{
LOGPFSML(bssmap_reset->fi, LOGL_NOTICE, "link up\n");
bssmap_reset->conn_cfm_failures = 0;
if (bssmap_reset->cfg.ops.link_up)
bssmap_reset->cfg.ops.link_up(bssmap_reset->cfg.data);
}
static void link_lost(struct bssmap_reset *bssmap_reset)
{
LOGPFSML(bssmap_reset->fi, LOGL_NOTICE, "link lost\n");
if (bssmap_reset->cfg.ops.link_lost)
bssmap_reset->cfg.ops.link_lost(bssmap_reset->cfg.data);
}
static void tx_reset(struct bssmap_reset *bssmap_reset)
{
if (bssmap_reset->cfg.ops.tx_reset)
bssmap_reset->cfg.ops.tx_reset(bssmap_reset->cfg.data);
}
static void bssmap_reset_disc_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
{
struct bssmap_reset *bssmap_reset = (struct bssmap_reset*)fi->priv;
if (prev_state == BSSMAP_RESET_ST_CONN)
link_lost(bssmap_reset);
}
static void bssmap_reset_disc_action(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
bssmap_reset_fsm_state_chg(fi, BSSMAP_RESET_ST_CONN);
}
static void bssmap_reset_conn_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
{
struct bssmap_reset *bssmap_reset = (struct bssmap_reset*)fi->priv;
if (prev_state != BSSMAP_RESET_ST_CONN)
link_up(bssmap_reset);
}
static void bssmap_reset_conn_action(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
struct bssmap_reset *bssmap_reset = (struct bssmap_reset*)fi->priv;
switch (event) {
case BSSMAP_RESET_EV_RX_RESET_ACK:
LOGPFSML(fi, LOGL_INFO, "Ignoring duplicate RESET ACK\n");
break;
case BSSMAP_RESET_EV_CONN_CFM_FAILURE:
bssmap_reset->conn_cfm_failures++;
if (bssmap_reset->conn_cfm_failures > bssmap_reset->cfg.conn_cfm_failure_threshold)
bssmap_reset_fsm_state_chg(fi, BSSMAP_RESET_ST_DISC);
break;
case BSSMAP_RESET_EV_CONN_CFM_SUCCESS:
bssmap_reset->conn_cfm_failures = 0;
break;
default:
OSMO_ASSERT(false);
}
}
static int bssmap_reset_fsm_timer_cb(struct osmo_fsm_inst *fi)
{
struct bssmap_reset *bssmap_reset = (struct bssmap_reset*)fi->priv;
tx_reset(bssmap_reset);
/* (re-)enter disconnect state to resend RESET after timeout. */
bssmap_reset_fsm_state_chg(fi, BSSMAP_RESET_ST_DISC);
/* Return 0 to not terminate the fsm */
return 0;
}
#define S(x) (1 << (x))
static struct osmo_fsm_state bssmap_reset_fsm_states[] = {
[BSSMAP_RESET_ST_DISC] = {
.name = "DISC",
.in_event_mask = 0
| S(BSSMAP_RESET_EV_RX_RESET_ACK)
,
.out_state_mask = 0
| S(BSSMAP_RESET_ST_DISC)
| S(BSSMAP_RESET_ST_CONN)
,
.onenter = bssmap_reset_disc_onenter,
.action = bssmap_reset_disc_action,
},
[BSSMAP_RESET_ST_CONN] = {
.name = "CONN",
.in_event_mask = 0
| S(BSSMAP_RESET_EV_RX_RESET_ACK)
| S(BSSMAP_RESET_EV_CONN_CFM_FAILURE)
| S(BSSMAP_RESET_EV_CONN_CFM_SUCCESS)
,
.out_state_mask = 0
| S(BSSMAP_RESET_ST_DISC)
| S(BSSMAP_RESET_ST_CONN)
,
.onenter = bssmap_reset_conn_onenter,
.action = bssmap_reset_conn_action,
},
};
static struct osmo_fsm bssmap_reset_fsm = {
.name = "bssmap_reset",
.states = bssmap_reset_fsm_states,
.num_states = ARRAY_SIZE(bssmap_reset_fsm_states),
.log_subsys = DRESET,
.timer_cb = bssmap_reset_fsm_timer_cb,
.event_names = bssmap_reset_fsm_event_names,
};
bool bssmap_reset_is_conn_ready(const struct bssmap_reset *bssmap_reset)
{
return bssmap_reset->fi->state == BSSMAP_RESET_ST_CONN;
}
static __attribute__((constructor)) void bssmap_reset_fsm_init()
{
OSMO_ASSERT(osmo_fsm_register(&bssmap_reset_fsm) == 0);
}
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