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/* Frame number calculation test */
/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
* All Rights Reserved
*
* Author: Philipp Maier
*
* 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 "bts.h"
#include <string.h>
#include <stdio.h>
extern "C" {
#include <osmocom/core/application.h>
#include <osmocom/gsm/gsm_utils.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/utils.h>
}
#define RFN_MODULUS 42432
/* globals used by the code */ void *tall_pcu_ctx;
int16_t spoof_mnc = 0, spoof_mcc = 0;
static uint32_t calc_fn(BTS * bts, uint32_t rfn)
{
uint32_t fn;
fn = bts->rfn_to_fn(rfn);
printf("rfn=%i ==> fn=%i\n", rfn, fn);
return fn;
}
static void set_fn(BTS * bts, uint32_t fn)
{
printf("\n");
bts->set_current_frame_number(fn);
printf("bts: fn=%i\n", fn);
}
static void run_test()
{
BTS bts;
uint32_t fn;
printf("RFN_MODULUS=%i\n",RFN_MODULUS);
printf("GSM_MAX_FN=%i\n",GSM_MAX_FN);
/* Test with a collection of real world examples,
* all all of them are not critical and do not
* assume the occurence of any race contions */
set_fn(&bts, 1320462);
fn = calc_fn(&bts, 5066);
OSMO_ASSERT(fn == 1320458);
set_fn(&bts, 8246);
fn = calc_fn(&bts, 8244);
OSMO_ASSERT(fn == 8244);
set_fn(&bts, 10270);
fn = calc_fn(&bts, 10269);
OSMO_ASSERT(fn == 10269);
set_fn(&bts, 311276);
fn = calc_fn(&bts, 14250);
OSMO_ASSERT(fn == 311274);
/* Now lets assume a case where the frame number
* just wrapped over a little bit above the
* modulo 42432 raster, but the rach request
* occurred before the wrapping */
set_fn(&bts, RFN_MODULUS + 30);
fn = calc_fn(&bts, RFN_MODULUS - 10);
OSMO_ASSERT(fn == 42422);
set_fn(&bts, RFN_MODULUS + 1);
fn = calc_fn(&bts, RFN_MODULUS - 1);
OSMO_ASSERT(fn == 42431);
set_fn(&bts, RFN_MODULUS * 123 + 16);
fn = calc_fn(&bts, RFN_MODULUS - 4);
OSMO_ASSERT(fn == 5219132);
set_fn(&bts, RFN_MODULUS * 123 + 451);
fn = calc_fn(&bts, RFN_MODULUS - 175);
OSMO_ASSERT(fn == 5218961);
/* Lets check a special cornercase. We assume that
* the BTS just wrapped its internal frame number
* but we still get rach requests with high relative
* frame numbers. */
set_fn(&bts, 0);
fn = calc_fn(&bts, RFN_MODULUS - 13);
OSMO_ASSERT(fn == 2715635);
set_fn(&bts, 453);
fn = calc_fn(&bts, RFN_MODULUS - 102);
OSMO_ASSERT(fn == 2715546);
set_fn(&bts, 10);
fn = calc_fn(&bts, RFN_MODULUS - 10);
OSMO_ASSERT(fn == 2715638);
set_fn(&bts, 23);
fn = calc_fn(&bts, RFN_MODULUS - 42);
OSMO_ASSERT(fn == 2715606);
/* Also check with some corner case
* values where Fn and RFn reach its
* maximum/minimum valid range */
set_fn(&bts, GSM_MAX_FN);
fn = calc_fn(&bts, RFN_MODULUS-1);
OSMO_ASSERT(fn == GSM_MAX_FN-1);
set_fn(&bts, 0);
fn = calc_fn(&bts, RFN_MODULUS-1);
OSMO_ASSERT(fn == GSM_MAX_FN-1);
set_fn(&bts, GSM_MAX_FN);
fn = calc_fn(&bts, 0);
OSMO_ASSERT(fn == GSM_MAX_FN);
set_fn(&bts, 0);
fn = calc_fn(&bts, 0);
OSMO_ASSERT(fn == 0);
}
int main(int argc, char **argv)
{
tall_pcu_ctx = talloc_named_const(NULL, 1, "fn test context");
if (!tall_pcu_ctx)
abort();
msgb_talloc_ctx_init(tall_pcu_ctx, 0);
osmo_init_logging(&gprs_log_info);
log_set_use_color(osmo_stderr_target, 0);
log_set_print_filename(osmo_stderr_target, 0);
log_set_log_level(osmo_stderr_target, LOGL_DEBUG);
run_test();
return EXIT_SUCCESS;
}
/*
* stubs that should not be reached
*/
extern "C" {
void l1if_pdch_req() {
abort();
} void l1if_connect_pdch() {
abort();
}
void l1if_close_pdch() {
abort();
}
void l1if_open_pdch() {
abort();
}
}
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