include/osmocom/bsc/handover_cfg.h

#pragma once

#include <stdbool.h>

struct vty;

/* handover_cfg is an opaque struct to manage several levels of configuration. There is an overall handover
 * config on 'network' level and a per-'bts' specific handover config. If the 'bts' level sets no values,
 * the defaults from 'network' level are used implicitly, and changes take effect immediately. */
struct handover_cfg;

struct handover_cfg *ho_cfg_init(void *ctx, struct handover_cfg *higher_level_cfg);

#define HO_CFG_STR_HANDOVER "Handover options\n"
#define HO_CFG_STR_WIN HO_CFG_STR_HANDOVER "Measurement averaging settings\n"
#define HO_CFG_STR_WIN_RXLEV HO_CFG_STR_WIN "Received-Level averaging\n"
#define HO_CFG_STR_WIN_RXQUAL HO_CFG_STR_WIN "Received-Quality averaging\n"
#define HO_CFG_STR_POWER_BUDGET HO_CFG_STR_HANDOVER "Neighbor cell power triggering\n" "Neighbor cell power triggering\n"
#define HO_CFG_STR_AVG_COUNT "Number of values to average over\n"

#define as_is(x) (x)

static inline bool a2bool(const char *arg)
{
	return (bool)(atoi(arg));
}

static inline int bool2i(bool arg)
{
	return arg? 1 : 0;
}


/* The HO_CFG_ONE_MEMBER macro gets redefined, depending on whether to define struct members,
 * function declarations or definitions... It is of the format
 *   HO_CFG_ONE_MEMBER(TYPE, NAME, DEFAULT_VAL,
 *                     VTY_CMD, VTY_CMD_ARG, VTY_ARG_EVAL,
 *                     VTY_WRITE_FMT, VTY_WRITE_CONV,
 *                     VTY_DOC)
 * Then using HO_CFG_ALL_MEMBERS can save a lot of code dup in defining API declaration, API
 * definitions, VTY commands and VTY write code. Of course this doesn't prevent us from adding manual
 * members as well, in case future additions don't fit in this scheme.
 *
 * TYPE: a type name like int.
 * NAME: a variable name suitable for a struct member.
 * DEFAULT_VAL: default value, as passed to the VTY, e.g. '0' or 'foo', without quotes.
 * VTY_CMD: a command string for VTY without any arguments.
 * VTY_CMD_ARG: VTY value range like '<0-23>' or 'foo|bar', will become '(VTY_CMD_ARG|default)'.
 * VTY_ARG_EVAL: function name for parsing the VTY arg[0], e.g. 'atoi'.
 * VTY_WRITE_FMT: printf-like string format for vty_out().
 * VTY_WRITE_CONV: function name to convert struct value to VTY_WRITE_FMT, e.g. 'as_is'.
 * VTY_DOC: VTY documentation strings to match VTY_CMD and VTY_CMD_ARGs.
 */
#define HO_CFG_ALL_MEMBERS \
	\
	HO_CFG_ONE_MEMBER(bool, ho_active, 0, \
		"handover", "0|1", a2bool, "%d", bool2i, \
		HO_CFG_STR_HANDOVER \
		"Disable in-call handover\n" \
		"Enable in-call handover\n" \
		"Enable/disable handover: ") \
	\
	HO_CFG_ONE_MEMBER(unsigned int, rxlev_avg_win, 10, \
		"handover window rxlev averaging", "<1-10>", atoi, "%u", as_is, \
		HO_CFG_STR_WIN_RXLEV \
		"How many RxLev measurements are used for averaging\n" \
		"RxLev averaging: " HO_CFG_STR_AVG_COUNT) \
	\
	HO_CFG_ONE_MEMBER(unsigned int, rxqual_avg_win, 1, \
		"handover window rxqual averaging", "<1-10>", atoi, "%u", as_is, \
		HO_CFG_STR_WIN_RXQUAL \
		"How many RxQual measurements are used for averaging\n" \
		"RxQual averaging: " HO_CFG_STR_AVG_COUNT) \
	\
	HO_CFG_ONE_MEMBER(unsigned int, rxlev_neigh_avg_win, 10, \
		"handover window rxlev neighbor averaging", "<1-10>", atoi, "%u", as_is, \
		HO_CFG_STR_WIN_RXLEV \
		"How many Neighbor RxLev measurements are used for averaging\n" \
		"How many Neighbor RxLev measurements are used for averaging\n" \
		"Neighbor RxLev averaging: " HO_CFG_STR_AVG_COUNT) \
	\
	HO_CFG_ONE_MEMBER(unsigned int, pwr_interval, 6, \
		"handover power budget interval", "<1-99>", atoi, "%u", as_is, \
		HO_CFG_STR_POWER_BUDGET \
		"How often to check for a better cell (SACCH frames)\n" \
		"Check for stronger neighbor every N number of SACCH frames\n") \
	\
	HO_CFG_ONE_MEMBER(unsigned int, pwr_hysteresis, 3, \
		"handover power budget hysteresis", "<0-999>", atoi, "%u", as_is, \
		HO_CFG_STR_POWER_BUDGET \
		"How many dBm stronger must a neighbor be to become a HO candidate\n" \
		"Neighbor's strength difference in dBm\n") \
	\
	HO_CFG_ONE_MEMBER(unsigned int, max_distance, 9999, \
		"handover maximum distance" , "<0-9999>", atoi, "%u", as_is, \
		HO_CFG_STR_HANDOVER \
		"Maximum Timing-Advance value (i.e. MS distance) before triggering HO\n" \
		"Maximum Timing-Advance value (i.e. MS distance) before triggering HO\n" \
		"Maximum Timing-Advance value (i.e. MS distance) before triggering HO\n") \


/* Declare public API for handover cfg parameters... */

#define HO_CFG_ONE_MEMBER(TYPE, NAME, DEFAULT_VAL, VTY1, VTY2, VTY3, VTY4, VTY5, VTY6) \
	TYPE ho_get_##NAME(struct handover_cfg *ho); \
	void ho_set_##NAME(struct handover_cfg *ho, TYPE val); \
	bool ho_isset_##NAME(struct handover_cfg *ho); \
	void ho_clear_##NAME(struct handover_cfg *ho); \
	bool ho_isset_on_parent_##NAME(struct handover_cfg *ho);

HO_CFG_ALL_MEMBERS
#undef HO_CFG_ONE_MEMBER