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Diffstat (limited to 'tests/fn/FnTest.cpp')
| -rw-r--r-- | tests/fn/FnTest.cpp | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/tests/fn/FnTest.cpp b/tests/fn/FnTest.cpp new file mode 100644 index 00000000..279903c8 --- /dev/null +++ b/tests/fn/FnTest.cpp @@ -0,0 +1,175 @@ +/* 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(); + } +} |