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/*! \file tdef.h
* API to define Tnnn timers globally and use for FSM state changes.
*/
/*
* (C) 2018-2019 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
*
* All Rights Reserved
*
* SPDX-License-Identifier: GPL-2.0+
*
* Author: Neels Hofmeyr <neels@hofmeyr.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/>.
*/
#pragma once
#include <stdint.h>
#include <osmocom/core/utils.h>
struct osmo_fsm_inst;
/*! \defgroup Tdef Tnnn timer configuration
* @{
* \file tdef.h
*/
enum osmo_tdef_unit {
OSMO_TDEF_S = 0, /*!< most T are in seconds, keep 0 as default. */
OSMO_TDEF_MS, /*!< milliseconds */
OSMO_TDEF_M, /*!< minutes */
OSMO_TDEF_CUSTOM, /*!< unspecified unit, explained in osmo_tdef.desc. */
};
extern const struct value_string osmo_tdef_unit_names[];
/*! \return enum osmo_tdef_unit value as human readable unit letter, or "custom-unit". */
static inline const char *osmo_tdef_unit_name(enum osmo_tdef_unit val)
{ return get_value_string(osmo_tdef_unit_names, val); }
/*! Define a GSM timer of the form Tnnn, with unit, default value and doc string.
* Typically used as an array with the last entry being left zero-initialized, e.g.:
*
* struct osmo_tdef tdefs[] = {
* { .T=10, .default_val=6, .desc="RR Assignment" },
* { .T=101, .default_val=10, .desc="inter-BSC Handover MT, HO Request to HO Accept" },
* { .T=3101, .default_val=3, .desc="RR Immediate Assignment" },
* { .T=-23, .default_val=42, .desc="internal X23 timeout (contrived example)" },
* {}
* };
*
* Program initialization should call osmo_tdefs_reset() so that all timers return the default_val, until e.g. the VTY
* configuration sets user-defined values (see osmo_tdef_vty_init()).
*/
struct osmo_tdef {
/*! T1234 or X1234 number, corresponding to struct osmo_fsm_inst::T.
* Positive values for T are considered to be 3GPP spec compliant and appear in logging and VTY as "T1234",
* while negative values are considered to be Osmocom specific timers, represented in logging and VTY as
* "X1234". Be aware that osmo_tdef_fsm_inst_state_chg() interprets T == 0 as "state without timeout". */
const int T;
/*! Timeout duration (according to unit), default value; type corresponds to osmo_fsm_inst_state_chg()'s
* timeout_secs argument. Note that osmo_fsm_inst_state_chg() clamps the range. */
const unsigned long default_val;
const enum osmo_tdef_unit unit;
/*! Human readable description. For unit == OSMO_TDEF_CUSTOM, this should include an explanation of the value's
* unit. Best keep this a short one-liner (e.g. for VTY output). */
const char *desc;
/*! Currently active timeout value, e.g. set by user config. This is the only mutable member: a user may
* configure the timeout value, but neither unit nor any other field. */
unsigned long val;
};
/*! Iterate an array of struct osmo_tdef, the last item should be fully zero, i.e. "{}".
* Example:
*
* struct osmo_tdef *t;
* osmo_tdef_for_each(t, tdefs) {
* printf("%lu %s %s\n", t->val, osmo_tdef_unit_name(t->unit), t->desc);
* }
*
* \param[inout] t A struct osmo_tdef *t used for iteration, will point at the current entry inside the loop scope.
* \param[in] tdefs Array of struct osmo_tdef to iterate, zero-terminated.
*/
#define osmo_tdef_for_each(t, tdefs) \
for (t = tdefs; t && (t->T || t->default_val || t->desc); t++)
void osmo_tdefs_reset(struct osmo_tdef *tdefs);
unsigned long osmo_tdef_get(const struct osmo_tdef *tdefs, int T, enum osmo_tdef_unit as_unit,
unsigned long val_if_not_present);
struct osmo_tdef *osmo_tdef_get_entry(struct osmo_tdef *tdefs, int T);
/*! Using osmo_tdef for osmo_fsm_inst: array entry for a mapping of state numbers to timeout definitions.
* For a usage example, see osmo_tdef_get_state_timeout() and test_tdef_state_timeout() in tdef_test.c. */
struct osmo_tdef_state_timeout {
/*! Timer number to match struct osmo_tdef.T, and to pass to osmo_fsm_inst_state_chg(). Positive values for T
* are considered to be 3GPP spec compliant and appear in logging and VTY as "T1234", while negative values are
* considered to be Osmocom specific timers, represented in logging and VTY as "X1234". */
int T;
/*! If true, call osmo_fsm_inst_state_chg_keep_timer().
* If T == 0, keep previous T number, otherwise also set fi->T. */
bool keep_timer;
};
const struct osmo_tdef_state_timeout *osmo_tdef_get_state_timeout(uint32_t state,
const struct osmo_tdef_state_timeout *timeouts_array);
/*! Call osmo_fsm_inst_state_chg() or osmo_fsm_inst_state_chg_keep_timer(), depending on the timeouts_array, tdefs and
* default_timeout.
*
* A T timer configured in sub-second precision is rounded up to the next full second. A timer in unit =
* OSMO_TDEF_CUSTOM is applied as if the unit is in seconds (i.e. this macro does not make sense for custom units!).
*
* See osmo_tdef_get_state_timeout() and osmo_tdef_get().
*
* If no T timer is defined for the given state (T == 0), invoke the state change without a timeout.
*
* Should a T number be defined in timeouts_array that is not defined in tdefs, use default_timeout (in seconds). If
* default_timeout is negative, a missing T definition in tdefs instead causes a program abort.
*
* This is best used by wrapping this function call in a macro suitable for a specific FSM implementation, which can
* become as short as: my_fsm_state_chg(fi, NEXT_STATE):
*
* #define my_fsm_state_chg(fi, NEXT_STATE) \
* osmo_tdef_fsm_inst_state_chg(fi, NEXT_STATE, my_fsm_timeouts, global_T_defs, 5)
*
* my_fsm_state_chg(fi, MY_FSM_STATE_1);
* // -> No timeout configured, will enter state without timeout.
*
* my_fsm_state_chg(fi, MY_FSM_STATE_3);
* // T423 configured for this state, will look up T423 in tdefs, or use 5 seconds if unset.
*
* my_fsm_state_chg(fi, MY_FSM_STATE_8);
* // keep_timer == true for this state, will invoke osmo_fsm_inst_state_chg_keep_timer().
*
* \param[inout] fi osmo_fsm_inst to transition to another state.
* \param[in] state State number to transition to.
* \param[in] timeouts_array Array of struct osmo_tdef_state_timeout[32] to look up state in.
* \param[in] tdefs Array of struct osmo_tdef (last entry zero initialized) to look up T in.
* \param[in] default_timeout If a T is set in timeouts_array, but no timeout value is configured for T, then use this
* default timeout value as fallback, or pass -1 to abort the program.
* \return Return value from osmo_fsm_inst_state_chg() or osmo_fsm_inst_state_chg_keep_timer().
*/
#define osmo_tdef_fsm_inst_state_chg(fi, state, timeouts_array, tdefs, default_timeout) \
_osmo_tdef_fsm_inst_state_chg(fi, state, timeouts_array, tdefs, default_timeout, \
__FILE__, __LINE__)
int _osmo_tdef_fsm_inst_state_chg(struct osmo_fsm_inst *fi, uint32_t state,
const struct osmo_tdef_state_timeout *timeouts_array,
const struct osmo_tdef *tdefs, unsigned long default_timeout,
const char *file, int line);
/*! Manage timer definitions in named groups.
* This should be defined as an array with the final element kept fully zero-initialized,
* to be compatible with osmo_tdef_vty* API. There must not be any tdefs == NULL entries except on the final
* zero-initialized entry. */
struct osmo_tdef_group {
const char *name;
const char *desc;
struct osmo_tdef *tdefs;
};
/*! Iterate an array of struct osmo_tdef_group, the last item should be fully zero, i.e. "{}".
* \param[inout] g A struct osmo_tdef_group *g used for iteration, will point at the current entry inside the loop scope.
* \param[in] tdefs Array of struct osmo_tdef_group to iterate, zero-terminated.
*/
#define osmo_tdef_groups_for_each(g, tdef_groups) \
for (g = tdef_groups; g && g->tdefs; g++)
/*! @} */
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