tests/tbf/TbfTest.cpp

/*
 * TbfTest.cpp
 *
 * Copyright (C) 2013 by Holger Hans Peter Freyther
 *
 * All Rights Reserved
 *
 * 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 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 "tbf.h"
#include "tbf_dl.h"
#include "tbf_ul.h"
#include "gprs_ms.h"
#include "gprs_debug.h"
#include "gprs_ms_storage.h"
#include "pcu_utils.h"
#include "gprs_bssgp_pcu.h"
#include "pcu_l1_if.h"
#include "decoding.h"
#include <gprs_rlcmac.h>

extern "C" {
#include "pcu_vty.h"
#include "coding_scheme.h"
#include "alloc_algo.h"

#include <osmocom/core/application.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/utils.h>
#include <osmocom/vty/vty.h>
#include <osmocom/gprs/protocol/gsm_04_60.h>
#include <osmocom/gsm/l1sap.h>
#include <osmocom/core/fsm.h>
}

#include <errno.h>

#define DUMMY_FN 2654167

void *tall_pcu_ctx;
int16_t spoof_mnc = 0, spoof_mcc = 0;
bool spoof_mnc_3_digits = false;

/* Measurements shared by all unit tests */
static struct pcu_l1_meas meas;

int gprs_gp_send_test_cb(void *ctx, struct msgb *msg)
{
	return 0;
}

static gprs_pcu *prepare_pcu(void)
{
	struct gprs_pcu *pcu = gprs_pcu_alloc(tall_pcu_ctx);
	bssgp_set_bssgp_callback(gprs_gp_send_test_cb, NULL);
	osmo_tdef_set(pcu->T_defs, -2030, 0, OSMO_TDEF_S);
	osmo_tdef_set(pcu->T_defs, -2031, 0, OSMO_TDEF_S);
	return pcu;
}

static int bts_handle_rach(struct gprs_rlcmac_bts *bts, uint16_t ra, uint32_t Fn, int16_t qta)
{
	struct rach_ind_params rip = {
		.burst_type = GSM_L1_BURST_TYPE_ACCESS_0,
		.is_11bit = false,
		.ra = ra,
		.trx_nr = 0,
		.ts_nr = 0,
		.rfn = Fn,
		.qta = qta,
	};

	return bts_rcv_rach(bts, &rip);
}

static void check_tbf(gprs_rlcmac_tbf *tbf)
{
	OSMO_ASSERT(tbf);
	if (tbf->state_is(TBF_ST_WAIT_RELEASE))
		OSMO_ASSERT(tbf->timers_pending(T3191) || osmo_timer_pending(&tbf->state_fi->timer));
	if (tbf->state_is(TBF_ST_RELEASING))
		OSMO_ASSERT(tbf->timers_pending(T_MAX));
}

static void test_tbf_base()
{

	fprintf(stderr, "=== start %s ===\n", __func__);

	OSMO_ASSERT(GPRS_RLCMAC_DL_TBF == reverse(GPRS_RLCMAC_UL_TBF));
	OSMO_ASSERT(GPRS_RLCMAC_UL_TBF == reverse(GPRS_RLCMAC_DL_TBF));

	fprintf(stderr, "=== end %s ===\n", __func__);
}

static void test_tbf_tlli_update()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	GprsMs *ms, *ms_new;

	fprintf(stderr, "=== start %s ===\n", __func__);

	the_pcu->alloc_algorithm = alloc_algorithm_a;
	bts->trx[0].pdch[2].enable();
	bts->trx[0].pdch[3].enable();

	/*
	 * Make a uplink and downlink allocation
	 */
	ms = bts_alloc_ms(bts, 0, 0);
	gprs_rlcmac_tbf *dl_tbf = dl_tbf_alloc(bts,
						ms, 0, false);
	OSMO_ASSERT(dl_tbf != NULL);
	ms_confirm_tlli(ms, 0x2342);
	dl_tbf->set_ta(4);
	OSMO_ASSERT(ms_dl_tbf(ms) == dl_tbf);
	OSMO_ASSERT(dl_tbf->ms() == ms);

	gprs_rlcmac_tbf *ul_tbf = ul_tbf_alloc(bts,
						   ms, 0, false);
	OSMO_ASSERT(ul_tbf != NULL);
	ms_update_announced_tlli(ms, 0x2342);
	OSMO_ASSERT(ms_ul_tbf(ms) == ul_tbf);
	OSMO_ASSERT(ul_tbf->ms() == ms);

	OSMO_ASSERT(bts_ms_by_tlli(bts, 0x2342, GSM_RESERVED_TMSI) == ms);

	/*
	 * Now check.. that DL changes and that the timing advance
	 * has changed.
	 */
	ms_confirm_tlli(dl_tbf->ms(), 0x4232);

	/* It is still there, since the new TLLI has not been used for UL yet */
	ms_new = bts_ms_by_tlli(bts, 0x2342, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms == ms_new);

	ms_new = bts_ms_by_tlli(bts, 0x4232, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms == ms_new);
	OSMO_ASSERT(ms_dl_tbf(ms) == dl_tbf);
	OSMO_ASSERT(ms_ul_tbf(ms) == ul_tbf);

	/* Now use the new TLLI for UL */
	ms_update_announced_tlli(ms, 0x4232);
	ms_new = bts_ms_by_tlli(bts, 0x2342, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms_new == NULL);

	ms_new = bts_ms_by_tlli(bts, 0x4232, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms_new != NULL);
	OSMO_ASSERT(ms_ta(ms_new) == 4);

	OSMO_ASSERT(ul_tbf->ta() == 4);
	OSMO_ASSERT(dl_tbf->ta() == 4);

	ul_tbf->set_ta(6);

	OSMO_ASSERT(ul_tbf->ta() == 6);
	OSMO_ASSERT(dl_tbf->ta() == 6);

	fprintf(stderr, "=== end %s ===\n", __func__);
	TALLOC_FREE(the_pcu);
}

static uint8_t llc_data[200];

/* override, requires '-Wl,--wrap=pcu_sock_send' */
int __real_pcu_sock_send(struct msgb *msg);
extern "C" int __wrap_pcu_sock_send(struct msgb *msg)
{
	return 0;
}

static void setup_bts(struct gprs_rlcmac_bts *bts, uint8_t ts_no, uint8_t cs = 1)
{
	gprs_rlcmac_trx *trx;

	the_pcu->alloc_algorithm = alloc_algorithm_a;
	bts->initial_cs_dl = cs;
	bts->initial_cs_ul = cs;
	trx = &bts->trx[0];
	trx->pdch[ts_no].enable();
	bts_set_current_frame_number(bts, DUMMY_FN);
}

static gprs_rlcmac_dl_tbf *create_dl_tbf(struct gprs_rlcmac_bts *bts, uint8_t ms_class,
	uint8_t egprs_ms_class, uint8_t *trx_no_)
{
	int tfi;
	uint8_t trx_no;
	GprsMs *ms;
	gprs_rlcmac_dl_tbf *dl_tbf;

	ms = bts_alloc_ms(bts, ms_class, egprs_ms_class);

	tfi = bts_tfi_find_free(bts, GPRS_RLCMAC_DL_TBF, &trx_no, -1);
	OSMO_ASSERT(tfi >= 0);
	dl_tbf = dl_tbf_alloc(bts, ms, trx_no, true);
	OSMO_ASSERT(dl_tbf);
	dl_tbf->set_ta(0);
	check_tbf(dl_tbf);

	/* "Establish" the DL TBF */
	osmo_fsm_inst_dispatch(dl_tbf->dl_ass_fsm.fi, TBF_DL_ASS_EV_SCHED_ASS, NULL);
	osmo_fsm_inst_dispatch(dl_tbf->state_fi, TBF_EV_ASSIGN_ADD_CCCH, NULL);
	osmo_fsm_inst_dispatch(dl_tbf->state_fi, TBF_EV_ASSIGN_ACK_PACCH, NULL);
	check_tbf(dl_tbf);

	*trx_no_ = trx_no;

	return dl_tbf;
}

static unsigned fn_add_blocks(unsigned fn, unsigned blocks)
{
	unsigned bn = fn2bn(fn) + blocks;
	fn = fn - (fn % 52);
	fn += bn * 4 + bn / 3;
	return fn % GSM_MAX_FN;
}

static void request_dl_rlc_block(struct gprs_rlcmac_bts *bts,
	struct gprs_rlcmac_pdch *pdch,
	uint32_t *fn, uint8_t *block_nr = NULL)
{
	uint8_t bn = fn2bn(*fn);
	gprs_rlcmac_rcv_rts_block(bts, pdch->trx->trx_no, pdch->ts_no, *fn, bn);
	*fn = fn_add_blocks(*fn, 1);
	bn += 1;
	if (block_nr)
		*block_nr = bn;
}

static void request_dl_rlc_block(struct gprs_rlcmac_tbf *tbf,
	uint32_t *fn, uint8_t *block_nr = NULL)
{
	request_dl_rlc_block(tbf->bts, tbf->control_ts, fn, block_nr);
}

enum test_tbf_final_ack_mode {
	TEST_MODE_STANDARD,
	TEST_MODE_REVERSE_FREE
};

/* Receive an ACK */
static void _rcv_ack(bool fin, gprs_rlcmac_dl_tbf *tbf, uint8_t *rbb)
{
	gprs_rlc_dl_window *w = static_cast<gprs_rlc_dl_window *>(tbf->window());
	uint8_t bits_data[RLC_GPRS_WS/8];
	bitvec bits;
	Ack_Nack_Description_t ack_nack;
	int bsn_begin, bsn_end;
	uint8_t ssn = w->v_s();

	bits.data = bits_data;
	bits.data_len = sizeof(bits_data);
	bits.cur_bit = 0;
	ack_nack.FINAL_ACK_INDICATION = fin;
	ack_nack.STARTING_SEQUENCE_NUMBER = ssn;
	memcpy(ack_nack.RECEIVED_BLOCK_BITMAP, rbb, RLC_GPRS_WS/8);

	Decoding::decode_gprs_acknack_bits(
		&ack_nack, &bits,
		&bsn_begin, &bsn_end, w);

	tbf->rcvd_dl_ack(fin, bsn_begin, &bits);
	if (!fin)
		OSMO_ASSERT(w->window_empty());
}

static void test_tbf_final_ack(enum test_tbf_final_ack_mode test_mode)
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	uint8_t ts_no = 4;
	unsigned i;
	uint8_t ms_class = 45;
	uint32_t fn;
	uint8_t block_nr;
	uint8_t trx_no;
	GprsMs *ms;
	uint32_t tlli = 0xffeeddcc;

	uint8_t rbb[64/8];

	fprintf(stderr, "=== start %s ===\n", __func__);

	gprs_rlcmac_dl_tbf *dl_tbf;
	gprs_rlcmac_tbf *new_tbf;

	setup_bts(bts, ts_no);
	dl_tbf = create_dl_tbf(bts, ms_class, 0, &trx_no);
	ms_confirm_tlli(dl_tbf->ms(), tlli);
	ms = dl_tbf->ms();

	for (i = 0; i < sizeof(llc_data); i++)
		llc_data[i] = i%256;

	/* Schedule two LLC frames */
	ms_append_llc_dl_data(dl_tbf->ms(), 1000, llc_data, sizeof(llc_data));
	ms_append_llc_dl_data(dl_tbf->ms(), 1000, llc_data, sizeof(llc_data));


	/* Send only a few RLC/MAC blocks */
	fn = 0;
	do {
		/* Request to send one block */
		request_dl_rlc_block(dl_tbf, &fn, &block_nr);
	} while (block_nr < 3);

	OSMO_ASSERT(dl_tbf->have_data());
	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_FLOW));

	/* Queue a final ACK */
	memset(rbb, 0, sizeof(rbb));
	/* Receive a final ACK */
	_rcv_ack(true, dl_tbf, rbb);

	/* Clean up and ensure tbfs are in the correct state */
	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_WAIT_RELEASE));
	new_tbf = ms_dl_tbf(ms);
	check_tbf(new_tbf);
	OSMO_ASSERT(new_tbf != dl_tbf);
	OSMO_ASSERT(new_tbf->tfi() == 1);
	check_tbf(dl_tbf);
	if (test_mode == TEST_MODE_REVERSE_FREE) {
		ms_ref(ms);
		tbf_free(new_tbf);
		OSMO_ASSERT(ms_dl_tbf(ms) == NULL);
		check_tbf(dl_tbf);
		tbf_free(dl_tbf);
		ms_unref(ms);
	} else {
		ms_ref(ms);
		tbf_free(dl_tbf);
		OSMO_ASSERT(ms_dl_tbf(ms) == new_tbf);
		check_tbf(new_tbf);
		tbf_free(new_tbf);
		OSMO_ASSERT(ms_dl_tbf(ms) == NULL);
		ms_unref(ms);
	}

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static void test_tbf_delayed_release()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	uint8_t ts_no = 4;
	unsigned i;
	uint8_t ms_class = 45;
	uint32_t fn = 0;
	uint8_t trx_no;
	uint32_t tlli = 0xffeeddcc;
	unsigned long dl_tbf_idle_msec;

	uint8_t rbb[64/8];

	gprs_rlcmac_dl_tbf *dl_tbf;

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no);
	OSMO_ASSERT(osmo_tdef_set(the_pcu->T_defs, -2031, 200, OSMO_TDEF_MS) == 0);

	dl_tbf = create_dl_tbf(bts, ms_class, 0, &trx_no);
	ms_confirm_tlli(dl_tbf->ms(), tlli);

	for (i = 0; i < sizeof(llc_data); i++)
		llc_data[i] = i%256;

	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_FLOW));

	/* Schedule two LLC frames */
	ms_append_llc_dl_data(dl_tbf->ms(), 1000, llc_data, sizeof(llc_data));
	ms_append_llc_dl_data(dl_tbf->ms(), 1000, llc_data, sizeof(llc_data));

	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_FLOW));

	/* Drain the queue */
	while (dl_tbf->have_data())
		/* Request to send one RLC/MAC block */
		request_dl_rlc_block(dl_tbf, &fn);

	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_FLOW));

	/* ACK all blocks */
	memset(rbb, 0xff, sizeof(rbb));

	_rcv_ack(false, dl_tbf, rbb); /* Receive an ACK */

	/* Force sending of a single block containing an LLC dummy command */
	request_dl_rlc_block(dl_tbf, &fn);

	_rcv_ack(false, dl_tbf, rbb); /* Receive an ACK */

	/* Timeout (make sure fn % 52 remains valid) */
	dl_tbf_idle_msec = osmo_tdef_get(the_pcu->T_defs, -2031, OSMO_TDEF_MS, -1);
	fn += 52 * ((msecs_to_frames(dl_tbf_idle_msec + 100) + 51)/ 52);
	request_dl_rlc_block(dl_tbf, &fn);

	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_FINISHED));

	_rcv_ack(true, dl_tbf, rbb); /* Receive a final ACK */

	/* Clean up and ensure tbfs are in the correct state */
	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_WAIT_RELEASE));
	check_tbf(dl_tbf);
	tbf_free(dl_tbf);
	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static void test_tbf_imsi()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	uint8_t ts_no = 4;
	uint8_t ms_class = 45;
	uint8_t trx_no;
	GprsMs *ms1, *ms2;

	gprs_rlcmac_dl_tbf *dl_tbf[2];

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no);

	dl_tbf[0] = create_dl_tbf(bts, ms_class, 0, &trx_no);
	dl_tbf[1] = create_dl_tbf(bts, ms_class, 0, &trx_no);

	ms_confirm_tlli(dl_tbf[0]->ms(), 0xf1000001);
	ms_confirm_tlli(dl_tbf[1]->ms(), 0xf1000002);

	ms_set_imsi(dl_tbf[0]->ms(), "001001000000001");
	ms1 = bts_ms_store(bts)->get_ms(GSM_RESERVED_TMSI, GSM_RESERVED_TMSI, "001001000000001");
	OSMO_ASSERT(ms1 != NULL);
	ms2 = bts_ms_store(bts)->get_ms(0xf1000001);
	OSMO_ASSERT(ms2 != NULL);
	OSMO_ASSERT(strcmp(ms_imsi(ms2), "001001000000001") == 0);
	OSMO_ASSERT(ms1 == ms2);

	/* change the IMSI on TBF 0 */
	ms_set_imsi(dl_tbf[0]->ms(), "001001000000002");
	ms1 = bts_ms_store(bts)->get_ms(GSM_RESERVED_TMSI, GSM_RESERVED_TMSI, "001001000000001");
	OSMO_ASSERT(ms1 == NULL);
	ms1 = bts_ms_store(bts)->get_ms(GSM_RESERVED_TMSI, GSM_RESERVED_TMSI, "001001000000002");
	OSMO_ASSERT(ms1 != NULL);
	OSMO_ASSERT(strcmp(ms_imsi(ms2), "001001000000002") == 0);
	OSMO_ASSERT(ms1 == ms2);

	/* use the same IMSI on TBF 1 */
	{
		ms_ref(ms2);
		ms_set_imsi(dl_tbf[1]->ms(), "001001000000002");
		ms1 = bts_ms_store(bts)->get_ms(GSM_RESERVED_TMSI, GSM_RESERVED_TMSI, "001001000000002");
		OSMO_ASSERT(ms1 != NULL);
		OSMO_ASSERT(ms1 != ms2);
		OSMO_ASSERT(strcmp(ms_imsi(ms1), "001001000000002") == 0);
		OSMO_ASSERT(strcmp(ms_imsi(ms2), "") == 0);
		ms_unref(ms2);
	}

	ms2 = bts_ms_store(bts)->get_ms(0xf1000001);
	OSMO_ASSERT(ms2 == NULL);

	tbf_free(dl_tbf[1]);
	ms1 = bts_ms_store(bts)->get_ms(GSM_RESERVED_TMSI, GSM_RESERVED_TMSI, "001001000000002");
	OSMO_ASSERT(ms1 == NULL);

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static void test_tbf_exhaustion()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	unsigned i;
	uint8_t ts_no = 4;
	uint8_t ms_class = 45;
	int rc = 0;

	uint8_t buf[256] = {0};

	fprintf(stderr, "=== start %s ===\n", __func__);

	bts->pcu->nsi = gprs_ns2_instantiate(tall_pcu_ctx, gprs_ns_prim_cb, NULL);
	if (!bts->pcu->nsi) {
		LOGP(DBSSGP, LOGL_ERROR, "Failed to create NS instance\n");
		abort();
	}

	setup_bts(bts, ts_no);
	gprs_bssgp_init(bts, 1234, 1234, 1, 1, false, 0, 0, 0);

	for (i = 0; i < 1024; i++) {
		uint32_t tlli = 0xc0000000 + i;
		char imsi[16] = {0};
		unsigned delay_csec = 1000;

		snprintf(imsi, sizeof(imsi), "001001%09d", i);

		rc = dl_tbf_handle(bts, tlli, 0, imsi, ms_class, 0,
			delay_csec, buf, sizeof(buf));

		if (rc < 0)
			break;
	}

	OSMO_ASSERT(rc == -EBUSY);
	fprintf(stderr, "=== end %s ===\n", __func__);

	TALLOC_FREE(the_pcu);
}

static void test_tbf_dl_llc_loss()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	struct gprs_rlcmac_pdch *pdch;
	uint8_t ts_no = 4;
	uint8_t ms_class = 45;
	int rc = 0;
	uint32_t tlli = 0xc0123456;
	const char *imsi = "001001000123456";
	unsigned delay_csec = 1000;
	GprsMs *ms;

	uint8_t buf[19];

	bts->pcu->nsi = gprs_ns2_instantiate(tall_pcu_ctx, gprs_ns_prim_cb, NULL);
	if (!bts->pcu->nsi) {
		LOGP(DBSSGP, LOGL_ERROR, "Failed to create NS instance\n");
		abort();
	}

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no);
	pdch = &bts->trx[0].pdch[ts_no];
	/* keep the MS object 10 seconds */
	OSMO_ASSERT(osmo_tdef_set(the_pcu->T_defs, -2030, 10, OSMO_TDEF_S) == 0);

	gprs_bssgp_init(bts, 2234, 2234, 1, 1, false, 0, 0, 0);

	/* Handle LLC frame 1 */
	memset(buf, 1, sizeof(buf));
	rc = dl_tbf_handle(bts, tlli, 0, imsi, ms_class, 0,
		delay_csec, buf, sizeof(buf));
	OSMO_ASSERT(rc >= 0);

	ms = bts_ms_store(bts)->get_ms(GSM_RESERVED_TMSI, GSM_RESERVED_TMSI, imsi);
	OSMO_ASSERT(ms != NULL);
	OSMO_ASSERT(ms_dl_tbf(ms) != NULL);
	ms_dl_tbf(ms)->set_ta(0);

	/* Handle LLC frame 2 */
	memset(buf, 2, sizeof(buf));
	rc = dl_tbf_handle(bts, tlli, 0, imsi, ms_class, 0,
		delay_csec, buf, sizeof(buf));
	OSMO_ASSERT(rc >= 0);

	/* TBF establishment fails (timeout) */
	tbf_free(ms_dl_tbf(ms));

	/* Handle LLC frame 3 */
	memset(buf, 3, sizeof(buf));
	rc = dl_tbf_handle(bts, tlli, 0, imsi, ms_class, 0,
		delay_csec, buf, sizeof(buf));
	OSMO_ASSERT(rc >= 0);

	OSMO_ASSERT(ms_dl_tbf(ms) != NULL);

	/* Here BTS would answer with data_cnf and trigger
	 * bts_rcv_imm_ass_cnf(), which would trigger TBF_EV_ASSIGN_PCUIF_CNF.
	 * That in turn would set up timer X2002. Finally, X2002 timeout
	 * moves it to FLOW state. We set X2002 timeout to 0 here to get
	 * immediate trigger through osmo_select_main() */
	OSMO_ASSERT(osmo_tdef_set(the_pcu->T_defs, -2002, 0, OSMO_TDEF_MS) == 0);
	osmo_fsm_inst_dispatch(ms_dl_tbf(ms)->state_fi, TBF_EV_ASSIGN_PCUIF_CNF, NULL);
	osmo_select_main(0);
	OSMO_ASSERT(ms_dl_tbf(ms)->state_is(TBF_ST_FLOW));

	/* Get first BSN */
	struct msgb *msg;
	int fn = 0;
	uint8_t expected_data = 1;
	static uint8_t exp[][GSM_MACBLOCK_LEN] = {
		{ 0x07, 0x00, 0x00, 0x4d, 0x01, 0x01, 0x01,
		  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 },
		{ 0x07, 0x00, 0x02, 0x4d, 0x02, 0x02, 0x02,
		  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02 },
		/* On last DL block, PCU requests polling (DL ACK/NACK): S/P 1 and RRBP 01, hence 0x07 becomes 0xf1 */
		{ 0x1f, 0x01, 0x04, 0x4d, 0x03, 0x03, 0x03,
		  0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03 },
	};

	while (ms_dl_tbf(ms)->have_data()) {
		msg = ms_dl_tbf(ms)->create_dl_acked_block(fn += 4, pdch);
		fprintf(stderr, "MSG = %s\n", msgb_hexdump(msg));
		if (!msgb_eq_data_print(msg, exp[expected_data - 1], GSM_MACBLOCK_LEN))
			fprintf(stderr, "%s failed at %u\n", __func__, expected_data);

		expected_data += 1;
	}
	OSMO_ASSERT(expected_data-1 == 3);

	fprintf(stderr, "=== end %s ===\n", __func__);

	/* Restore MS release timeout to 0 to make sure it is freed immediately: */
	ms_set_timeout(ms, 0);
	TALLOC_FREE(the_pcu);
}

static gprs_rlcmac_ul_tbf *establish_ul_tbf_single_phase(struct gprs_rlcmac_bts *bts,
	struct gprs_rlcmac_pdch *pdch, uint32_t tlli, uint32_t *fn, uint16_t qta)
{
	GprsMs *ms;
	int tfi = 0;
	gprs_rlcmac_ul_tbf *ul_tbf;

	tfi = bts_tfi_find_free(bts, GPRS_RLCMAC_UL_TBF, &pdch->trx->trx_no, -1);

	bts_handle_rach(bts, 0x03, *fn, qta);

	ul_tbf = bts_ul_tbf_by_tfi(bts, tfi, pdch->trx->trx_no, pdch->ts_no);
	OSMO_ASSERT(ul_tbf != NULL);

	OSMO_ASSERT(ul_tbf->ta() == qta / 4);

	uint8_t data_msg[23] = {
		0x00, /* GPRS_RLCMAC_DATA_BLOCK << 6 */
		uint8_t(1 | (tfi << 2)),
		uint8_t(1), /* BSN:7, E:1 */
		uint8_t(tlli >> 24), uint8_t(tlli >> 16),
		uint8_t(tlli >> 8), uint8_t(tlli), /* TLLI */
	};

	pdch->rcv_block(&data_msg[0], sizeof(data_msg), *fn, &meas);

	ms = bts_ms_by_tlli(bts, tlli, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms != NULL);

	return ul_tbf;
}

static void send_ul_mac_block_buf(struct gprs_rlcmac_bts *bts, struct gprs_rlcmac_pdch *pdch,
				  unsigned fn, uint8_t *buf, int num_bytes)
{
	bts_set_current_block_frame_number(bts, fn);
	pdch->rcv_block(buf, num_bytes, fn, &meas);
	pdch_ulc_expire_fn(pdch->ulc, fn);
}

static void send_ul_mac_block(struct gprs_rlcmac_bts *bts, struct gprs_rlcmac_pdch *pdch,
	RlcMacUplink_t *ulreq, unsigned fn)
{
	bitvec *rlc_block;
	uint8_t buf[64];
	int num_bytes;

	rlc_block = bitvec_alloc(23, tall_pcu_ctx);

	OSMO_ASSERT(encode_gsm_rlcmac_uplink(rlc_block, ulreq) == 0);
	num_bytes = bitvec_pack(rlc_block, &buf[0]);
	OSMO_ASSERT(size_t(num_bytes) < sizeof(buf));
	bitvec_free(rlc_block);

	send_ul_mac_block_buf(bts, pdch, fn, &buf[0], num_bytes);
}


static uint32_t get_poll_fn(struct gprs_rlcmac_tbf *tbf, struct gprs_rlcmac_pdch *pdch)
{
	struct pdch_ulc *ulc = pdch->ulc;
	struct rb_node *node;
	struct pdch_ulc_node *item;

	for (node = rb_first(&ulc->tree_root); node; node = rb_next(node)) {
		item = container_of(node, struct pdch_ulc_node, node);
		if (item->type == PDCH_ULC_NODE_TBF_POLL && item->tbf_poll.poll_tbf == tbf)
			return item->fn;
	}
	OSMO_ASSERT(0);
}

static void send_control_ack(gprs_rlcmac_tbf *tbf)
{
	RlcMacUplink_t ulreq = {0};

	ulreq.u.MESSAGE_TYPE = MT_PACKET_CONTROL_ACK;
	Packet_Control_Acknowledgement_t *ctrl_ack =
		&ulreq.u.Packet_Control_Acknowledgement;

	ctrl_ack->PayloadType = GPRS_RLCMAC_CONTROL_BLOCK;
	ctrl_ack->TLLI = tbf->tlli();
	send_ul_mac_block(tbf->bts, tbf->control_ts,
		&ulreq, get_poll_fn(tbf, tbf->control_ts));
}

static void send_empty_block(gprs_rlcmac_tbf *tbf, struct gprs_rlcmac_pdch *pdch, unsigned fn)
{
	send_ul_mac_block_buf(tbf->bts, pdch, fn, NULL, 0);
}

static gprs_rlcmac_ul_tbf *puan_urbb_len_issue(struct gprs_rlcmac_bts *bts,
	struct gprs_rlcmac_pdch *pdch, uint32_t tlli, uint32_t *fn, uint16_t qta,
	uint8_t ms_class, uint8_t egprs_ms_class)
{
	GprsMs *ms;
	uint32_t rach_fn = *fn - 51;
	uint32_t sba_fn = *fn + 52;
	int tfi = 0;
	gprs_rlcmac_ul_tbf *ul_tbf;
	RlcMacUplink_t ulreq = {0};
	struct gprs_rlc_ul_header_egprs_3 *egprs3  = NULL;

	/* needed to set last_rts_fn in the PDCH object */
	request_dl_rlc_block(bts, pdch, fn);

	/*
	 * simulate RACH, this sends an Immediate
	 * Assignment Uplink on the AGCH
	 */
	bts_handle_rach(bts, 0x73, rach_fn, qta);

	/* get next free TFI */
	tfi = bts_tfi_find_free(bts, GPRS_RLCMAC_UL_TBF, &pdch->trx->trx_no, -1);

	/* fake a resource request */
	ulreq.u.MESSAGE_TYPE = MT_PACKET_RESOURCE_REQUEST;
	ulreq.u.Packet_Resource_Request.PayloadType = GPRS_RLCMAC_CONTROL_BLOCK;
	ulreq.u.Packet_Resource_Request.ID.UnionType = 1; /* != 0 */
	ulreq.u.Packet_Resource_Request.ID.u.TLLI = tlli;
	ulreq.u.Packet_Resource_Request.Exist_MS_Radio_Access_capability2 = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		Count_MS_RA_capability_value = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		MS_RA_capability_value[0].u.Content.
		Exist_Multislot_capability = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		MS_RA_capability_value[0].u.Content.Multislot_capability.
		Exist_GPRS_multislot_class = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		MS_RA_capability_value[0].u.Content.Multislot_capability.
		GPRS_multislot_class = ms_class;
	if (egprs_ms_class) {
		ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
			MS_RA_capability_value[0].u.Content.
			Multislot_capability.Exist_EGPRS_multislot_class = 1;
		ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
			MS_RA_capability_value[0].u.Content.
			Multislot_capability.EGPRS_multislot_class = ms_class;
	}

	send_ul_mac_block(bts, pdch, &ulreq, sba_fn);

	/* check the TBF */
	ul_tbf = bts_ul_tbf_by_tfi(bts, tfi, pdch->trx->trx_no, pdch->ts_no);
	OSMO_ASSERT(ul_tbf);
	OSMO_ASSERT(ul_tbf->ta() == qta / 4);

	/* send packet uplink assignment */
	*fn = sba_fn;
	request_dl_rlc_block(ul_tbf, fn);

	/* send real acknowledgement */
	send_control_ack(ul_tbf);

	check_tbf(ul_tbf);
	/* send fake data */
	uint8_t data_msg[42] = {
		0xf << 2, /* GPRS_RLCMAC_DATA_BLOCK << 6, CV = 15 */
		(uint8_t)(tfi << 1),
		1, /* BSN:7, E:1 */
	};

	pdch->rcv_block(&data_msg[0], 23, *fn, &meas);

	ms = bts_ms_by_tlli(bts, tlli, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms != NULL);
	OSMO_ASSERT(ms_ta(ms) == qta/4);
	OSMO_ASSERT(ms_ul_tbf(ms) == ul_tbf);

	/*
	 * TS 44.060, B.8.1
	 * first seg received first, later second seg
	 */
	egprs3 = (struct gprs_rlc_ul_header_egprs_3 *) data_msg;
	egprs3->si = 0;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 1;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 0;
	egprs3->pi = 0;

	pdch->rcv_block(data_msg, 42, *fn, &meas);

	osmo_fsm_inst_dispatch(ul_tbf->ul_ack_fsm.fi, TBF_UL_ACK_EV_SCHED_ACK, NULL);
	struct msgb *msg1 = tbf_ul_ack_create_rlcmac_msg(ul_tbf, pdch, *fn);

	static uint8_t exp1[] = { 0x40, 0x24, 0x01, 0x0b, 0x3e, 0x24, 0x46, 0x68, 0x9c, 0x70, 0x87, 0xb0,
				  0x06, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b
	};

	if (!msgb_eq_data_print(msg1, exp1, GSM_MACBLOCK_LEN)) {
		fprintf(stderr, "%s test failed on 1st segment!\n", __func__);
		return NULL;
	}

	egprs3->si = 0;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 4;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 0;

	pdch->rcv_block(data_msg, 42, *fn, &meas);

	osmo_fsm_inst_dispatch(ul_tbf->ul_ack_fsm.fi, TBF_UL_ACK_EV_SCHED_ACK, NULL);
	msg1 = tbf_ul_ack_create_rlcmac_msg(ul_tbf, pdch, *fn);

	static uint8_t exp2[] = { 0x40, 0x24, 0x01, 0x0b, 0x3e, 0x24, 0x46, 0x68, 0x9c, 0x70, 0x88, 0xb0,
				  0x06, 0x8b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b
	};

	if (!msgb_eq_data_print(msg1, exp2, GSM_MACBLOCK_LEN)) {
		fprintf(stderr, "%s test failed on 2nd segment!\n", __func__);
		return NULL;
	}
	return ul_tbf;
}

static gprs_rlcmac_ul_tbf *establish_ul_tbf_two_phase_spb(struct gprs_rlcmac_bts *bts,
	struct gprs_rlcmac_pdch *pdch, uint32_t tlli, uint32_t *fn, uint16_t qta,
	uint8_t ms_class, uint8_t egprs_ms_class)
{
	GprsMs *ms;
	uint32_t rach_fn = *fn - 51;
	uint32_t sba_fn = *fn + 52;
	int tfi = 0, i = 0;
	gprs_rlcmac_ul_tbf *ul_tbf;
	RlcMacUplink_t ulreq = {0};
	struct gprs_rlc_ul_header_egprs_3 *egprs3  = NULL;

	/* needed to set last_rts_fn in the PDCH object */
	request_dl_rlc_block(bts, pdch, fn);

	/*
	 * simulate RACH, this sends an Immediate
	 * Assignment Uplink on the AGCH
	 */
	bts_handle_rach(bts, 0x73, rach_fn, qta);

	/* get next free TFI */
	tfi = bts_tfi_find_free(bts, GPRS_RLCMAC_UL_TBF, &pdch->trx->trx_no, -1);

	/* fake a resource request */
	ulreq.u.MESSAGE_TYPE = MT_PACKET_RESOURCE_REQUEST;
	ulreq.u.Packet_Resource_Request.PayloadType = GPRS_RLCMAC_CONTROL_BLOCK;
	ulreq.u.Packet_Resource_Request.ID.UnionType = 1; /* != 0 */
	ulreq.u.Packet_Resource_Request.ID.u.TLLI = tlli;
	ulreq.u.Packet_Resource_Request.Exist_MS_Radio_Access_capability2 = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		Count_MS_RA_capability_value = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		MS_RA_capability_value[0].u.Content.
			Exist_Multislot_capability = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		MS_RA_capability_value[0].u.Content.Multislot_capability.
		Exist_GPRS_multislot_class = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		MS_RA_capability_value[0].u.Content.Multislot_capability.
		GPRS_multislot_class = ms_class;
	if (egprs_ms_class) {
		ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
			MS_RA_capability_value[0].u.Content.
			Multislot_capability.Exist_EGPRS_multislot_class = 1;
		ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
			MS_RA_capability_value[0].u.Content.
			Multislot_capability.EGPRS_multislot_class = ms_class;
	}

	send_ul_mac_block(bts, pdch, &ulreq, sba_fn);

	/* check the TBF */
	ul_tbf = bts_ul_tbf_by_tfi(bts, tfi, pdch->trx->trx_no, pdch->ts_no);
	OSMO_ASSERT(ul_tbf != NULL);
	OSMO_ASSERT(ul_tbf->ta() == qta / 4);

	/* send packet uplink assignment */
	*fn = sba_fn;
	request_dl_rlc_block(ul_tbf, fn);

	/* send real acknowledgement */
	send_control_ack(ul_tbf);

	check_tbf(ul_tbf);

	/* send fake data */
	uint8_t data_msg[42] = {
		0x00 | 0xf << 2, /* GPRS_RLCMAC_DATA_BLOCK << 6, CV = 15 */
		uint8_t(0 | (tfi << 1)),
		uint8_t(1), /* BSN:7, E:1 */
	};

	pdch->rcv_block(&data_msg[0], 23, *fn, &meas);

	ms = bts_ms_by_tlli(bts, tlli, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms != NULL);
	OSMO_ASSERT(ms_ta(ms) == qta/4);
	OSMO_ASSERT(ms_ul_tbf(ms) == ul_tbf);

	/*
	 * TS 44.060, B.8.1
	 * first seg received first, later second seg
	 */
	egprs3 = (struct gprs_rlc_ul_header_egprs_3 *) data_msg;
	egprs3->si = 1;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 1;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 2;
	egprs3->pi = 0;

	pdch->rcv_block(data_msg, 42, *fn, &meas);

	struct gprs_rlc_data *block =  ul_tbf->m_rlc.block(1);

	/* check the status of the block */
	OSMO_ASSERT(block->spb_status.block_status_ul ==
				EGPRS_RESEG_FIRST_SEG_RXD);

	egprs3->si = 1;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 1;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 3;

	pdch->rcv_block(data_msg, 42, *fn, &meas);

	/* check the status of the block */
	OSMO_ASSERT(block->spb_status.block_status_ul ==
				EGPRS_RESEG_DEFAULT);
	OSMO_ASSERT(block->cs_last ==
			MCS6);
	/* Assembled MCS is MCS6. so the size is 74 */
	OSMO_ASSERT(block->len == 74);

	/*
	 * TS 44.060, B.8.1
	 * second seg first, later first seg
	 */
	memset(data_msg, 0, sizeof(data_msg));

	egprs3 = (struct gprs_rlc_ul_header_egprs_3 *) data_msg;
	egprs3->si = 1;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 2;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 3;
	egprs3->pi = 0;

	pdch->rcv_block(data_msg, 42, *fn, &meas);

	block =  ul_tbf->m_rlc.block(2);
	/* check the status of the block */
	OSMO_ASSERT(block->spb_status.block_status_ul ==
				EGPRS_RESEG_SECOND_SEG_RXD);

	egprs3->si = 1;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 2;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 2;
	egprs3->pi = 0;

	pdch->rcv_block(data_msg, 42, *fn, &meas);

	/* check the status of the block */
	OSMO_ASSERT(block->spb_status.block_status_ul ==
				EGPRS_RESEG_DEFAULT);
	OSMO_ASSERT(block->cs_last ==
			MCS6);
	/* Assembled MCS is MCS6. so the size is 74 */
	OSMO_ASSERT(block->len == 74);

	/*
	 * TS 44.060, B.8.1
	 * Error scenario with spb as 1
	 */
	egprs3 = (struct gprs_rlc_ul_header_egprs_3 *) data_msg;
	egprs3->si = 1;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 3;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 1;
	egprs3->pi = 0;

	pdch->rcv_block(data_msg, 42, *fn, &meas);

	block =  ul_tbf->m_rlc.block(3);
	/* check the status of the block */
	OSMO_ASSERT(block->spb_status.block_status_ul ==
				EGPRS_RESEG_DEFAULT);
	/*
	 * TS 44.060, B.8.1
	 * comparison of rlc_data for multiple scenarios
	 * Receive First, the second(BSN 3)
	 * Receive First, First then Second(BSN 4)
	 * Receive Second then First(BSN 5)
	 * after above 3 scenarios are triggered,
	 * rlc_data of all 3 BSN are compared
	 */

	/* Initialize the data_msg */
	for (i = 0; i < 42; i++)
		data_msg[i] = i;

	egprs3 = (struct gprs_rlc_ul_header_egprs_3 *) data_msg;
	egprs3->si = 1;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 3;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 2;
	egprs3->pi = 0;

	pdch->rcv_block(data_msg, 42, *fn, &meas);

	block =  ul_tbf->m_rlc.block(3);
	/* check the status of the block */
	OSMO_ASSERT(block->spb_status.block_status_ul ==
				EGPRS_RESEG_FIRST_SEG_RXD);

	egprs3 = (struct gprs_rlc_ul_header_egprs_3 *) data_msg;
	egprs3->si = 1;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 3;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 3;
	egprs3->pi = 0;

	pdch->rcv_block(data_msg, 42, *fn, &meas);

	block =  ul_tbf->m_rlc.block(3);
	/* check the status of the block */
	OSMO_ASSERT(block->spb_status.block_status_ul ==
				EGPRS_RESEG_DEFAULT);
	/* Assembled MCS is MCS6. so the size is 74 */
	OSMO_ASSERT(block->len == 74);
	OSMO_ASSERT(block->cs_last ==
			MCS6);

	egprs3 = (struct gprs_rlc_ul_header_egprs_3 *) data_msg;
	egprs3->si = 1;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 4;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 2;
	egprs3->pi = 0;

	pdch->rcv_block(data_msg, 42, *fn, &meas);

	block =  ul_tbf->m_rlc.block(4);
	/* check the status of the block */
	OSMO_ASSERT(block->spb_status.block_status_ul ==
				EGPRS_RESEG_FIRST_SEG_RXD);

	egprs3 = (struct gprs_rlc_ul_header_egprs_3 *) data_msg;
	egprs3->si = 1;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 4;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 2;
	egprs3->pi = 0;

	pdch->rcv_block(data_msg, 42, *fn, &meas);

	block =  ul_tbf->m_rlc.block(4);
	/* check the status of the block */
	OSMO_ASSERT(block->spb_status.block_status_ul ==
				EGPRS_RESEG_FIRST_SEG_RXD);

	egprs3 = (struct gprs_rlc_ul_header_egprs_3 *) data_msg;
	egprs3->si = 1;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 4;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 3;
	egprs3->pi = 0;

	pdch->rcv_block(data_msg, 42, *fn, &meas);

	block =  ul_tbf->m_rlc.block(4);
	/* check the status of the block */
	OSMO_ASSERT(block->spb_status.block_status_ul ==
				EGPRS_RESEG_DEFAULT);
	OSMO_ASSERT(block->cs_last ==
			MCS6);
	/* Assembled MCS is MCS6. so the size is 74 */
	OSMO_ASSERT(block->len == 74);

	egprs3 = (struct gprs_rlc_ul_header_egprs_3 *) data_msg;
	egprs3->si = 1;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 5;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 3;
	egprs3->pi = 0;

	pdch->rcv_block(data_msg, 42, *fn, &meas);

	block =  ul_tbf->m_rlc.block(5);
	/* check the status of the block */
	OSMO_ASSERT(block->spb_status.block_status_ul ==
				EGPRS_RESEG_SECOND_SEG_RXD);

	egprs3 = (struct gprs_rlc_ul_header_egprs_3 *) data_msg;
	egprs3->si = 1;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 5;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 2;
	egprs3->pi = 0;

	pdch->rcv_block(data_msg, 42, *fn, &meas);

	block =  ul_tbf->m_rlc.block(5);

	/* check the status of the block */
	OSMO_ASSERT(block->spb_status.block_status_ul ==
				EGPRS_RESEG_DEFAULT);
	OSMO_ASSERT(block->cs_last ==
			MCS6);
	/* Assembled MCS is MCS6. so the size is 74 */
	OSMO_ASSERT(block->len == 74);

	OSMO_ASSERT(ul_tbf->m_rlc.block(5)->len ==
				ul_tbf->m_rlc.block(4)->len);
	OSMO_ASSERT(ul_tbf->m_rlc.block(5)->len ==
				ul_tbf->m_rlc.block(3)->len);

	/* Compare the spb status of each BSNs(3,4,5). should be same */
	OSMO_ASSERT(
		ul_tbf->m_rlc.block(5)->spb_status.block_status_ul ==
		ul_tbf->m_rlc.block(4)->spb_status.block_status_ul);
	OSMO_ASSERT(
		ul_tbf->m_rlc.block(5)->spb_status.block_status_ul ==
		ul_tbf->m_rlc.block(3)->spb_status.block_status_ul);

	/* Compare the Assembled MCS of each BSNs(3,4,5). should be same */
	OSMO_ASSERT(ul_tbf->m_rlc.block(5)->cs_last ==
				ul_tbf->m_rlc.block(4)->cs_last);
	OSMO_ASSERT(ul_tbf->m_rlc.block(5)->cs_last ==
				ul_tbf->m_rlc.block(3)->cs_last);

	/* Compare the data of each BSNs(3,4,5). should be same */
	OSMO_ASSERT(
		!memcmp(ul_tbf->m_rlc.block(5)->block,
		ul_tbf->m_rlc.block(4)->block, ul_tbf->m_rlc.block(5)->len
		));
	OSMO_ASSERT(
		!memcmp(ul_tbf->m_rlc.block(5)->block,
		ul_tbf->m_rlc.block(3)->block, ul_tbf->m_rlc.block(5)->len
		));

	return ul_tbf;
}

static gprs_rlcmac_ul_tbf *establish_ul_tbf(struct gprs_rlcmac_bts *bts,
	struct gprs_rlcmac_pdch *pdch, uint32_t tlli, uint32_t *fn, uint16_t qta,
	uint8_t ms_class, uint8_t egprs_ms_class)
{
	uint32_t rach_fn = *fn - 51;
	uint32_t sba_fn = *fn + 52;
	int tfi = 0;
	gprs_rlcmac_ul_tbf *ul_tbf;
	RlcMacUplink_t ulreq = {0};

	/* needed to set last_rts_fn in the PDCH object */
	request_dl_rlc_block(bts, pdch, fn);

	/*
	 * simulate RACH, this sends an Immediate
	 * Assignment Uplink on the AGCH
	 */
	bts_handle_rach(bts, 0x73, rach_fn, qta);

	/* get next free TFI */
	tfi = bts_tfi_find_free(bts, GPRS_RLCMAC_UL_TBF, &pdch->trx->trx_no, -1);

	/* fake a resource request */
	ulreq.u.MESSAGE_TYPE = MT_PACKET_RESOURCE_REQUEST;
	ulreq.u.Packet_Resource_Request.PayloadType = GPRS_RLCMAC_CONTROL_BLOCK;
	ulreq.u.Packet_Resource_Request.ID.UnionType = 1; /* != 0 */
	ulreq.u.Packet_Resource_Request.ID.u.TLLI = tlli;
	ulreq.u.Packet_Resource_Request.Exist_MS_Radio_Access_capability2 = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		Count_MS_RA_capability_value = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		MS_RA_capability_value[0].u.Content.
		Exist_Multislot_capability = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		MS_RA_capability_value[0].u.Content.Multislot_capability.
		Exist_GPRS_multislot_class = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		MS_RA_capability_value[0].u.Content.Multislot_capability.
		GPRS_multislot_class = ms_class;
	if (egprs_ms_class) {
		ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
			MS_RA_capability_value[0].u.Content.
			Multislot_capability.Exist_EGPRS_multislot_class = 1;
		ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
			MS_RA_capability_value[0].u.Content.
			Multislot_capability.EGPRS_multislot_class = ms_class;
	}
	send_ul_mac_block(bts, pdch, &ulreq, sba_fn);

	/* check the TBF */
	ul_tbf = bts_ul_tbf_by_tfi(bts, tfi, pdch->trx->trx_no, pdch->ts_no);
	/* send packet uplink assignment */
	*fn = sba_fn;
	request_dl_rlc_block(ul_tbf, fn);

	/* send real acknowledgement */
	send_control_ack(ul_tbf);

	check_tbf(ul_tbf);

	return ul_tbf;
}

static gprs_rlcmac_ul_tbf *establish_ul_tbf_two_phase_puan_URBB_no_length(struct gprs_rlcmac_bts *bts,
	struct gprs_rlcmac_pdch *pdch, uint32_t tlli, uint32_t *fn, uint16_t qta,
	uint8_t ms_class, uint8_t egprs_ms_class, gprs_rlcmac_ul_tbf *ul_tbf)
{
	OSMO_ASSERT(ul_tbf);
	OSMO_ASSERT(ul_tbf->ta() == qta / 4);
	GprsMs *ms;
	int tfi = 0;

	/* send fake data with cv=0*/
	struct gprs_rlc_ul_header_egprs_3 *hdr3 = NULL;
	uint8_t data[49] = {0};

	hdr3 = (struct gprs_rlc_ul_header_egprs_3 *)data;

	/*header_construction */
	memset(data, 0x2b, sizeof(data));
	/* Message with CRBB */
	for (int i = 0 ; i < 80; i++) {
		hdr3->r = 0;
		hdr3->si = 0;
		hdr3->cv = 10;
		hdr3->tfi_hi = (tfi >> 3) & 0x3;
		hdr3->tfi_lo = tfi & 0x7;
		hdr3->bsn1_hi = ((i * 2)&0x1f);
		hdr3->bsn1_lo = ((i * 2)/32);
		hdr3->cps_hi = 0;
		hdr3->cps_lo = 0;
		hdr3->spb = 0;
		hdr3->rsb = 0;
		hdr3->pi = 0;
		hdr3->spare = 0;
		hdr3->dummy = 1;
		data[4] = 0x0;
		data[5] = 0x0;
		data[6] = 0x2b;
		data[7] = 0x2b;
		pdch->rcv_block(&data[0], sizeof(data), *fn, &meas);
	}
	osmo_fsm_inst_dispatch(ul_tbf->ul_ack_fsm.fi, TBF_UL_ACK_EV_SCHED_ACK, NULL);
	tbf_ul_ack_create_rlcmac_msg(ul_tbf, pdch, *fn);
	memset(data, 0x2b, sizeof(data));
	hdr3 = (struct gprs_rlc_ul_header_egprs_3 *)data;
	hdr3->r = 0;
	hdr3->si = 0;
	hdr3->cv = 0;
	hdr3->tfi_hi = (tfi >> 3) & 0x3;
	hdr3->tfi_lo = tfi & 0x7;
	hdr3->bsn1_hi = 0;
	hdr3->bsn1_lo = 2;
	hdr3->cps_hi = 0;
	hdr3->cps_lo = 0;
	hdr3->spb = 0;
	hdr3->rsb = 0;
	hdr3->pi = 0;
	hdr3->spare = 0;
	hdr3->dummy = 1;
	data[4] = 0x0;
	data[5] = 0x2b;
	data[6] = 0x2b;
	data[7] = 0x2b;

	pdch->rcv_block(&data[0], sizeof(data), *fn, &meas);

	request_dl_rlc_block(ul_tbf, fn);

	check_tbf(ul_tbf);
	OSMO_ASSERT(tbf_ul_ack_fi(ul_tbf)->state == TBF_UL_ACK_ST_NONE);

	ms = bts_ms_by_tlli(bts, tlli, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms != NULL);
	OSMO_ASSERT(ms_ta(ms) == qta/4);
	OSMO_ASSERT(ms_ul_tbf(ms) == ul_tbf);

	return ul_tbf;
}

static gprs_rlcmac_ul_tbf *establish_ul_tbf_two_phase_puan_URBB_with_length(struct gprs_rlcmac_bts *bts,
	struct gprs_rlcmac_pdch *pdch, uint32_t tlli, uint32_t *fn, uint16_t qta,
	uint8_t ms_class, uint8_t egprs_ms_class, gprs_rlcmac_ul_tbf *ul_tbf)
{
	OSMO_ASSERT(ul_tbf);
	OSMO_ASSERT(ul_tbf->ta() == qta / 4);
	GprsMs *ms;
	int tfi = 0;

	check_tbf(ul_tbf);
	/* send fake data with cv=0*/
	struct gprs_rlc_ul_header_egprs_3 *hdr3 = NULL;
	uint8_t data[49] = {0};

	hdr3 = (struct gprs_rlc_ul_header_egprs_3 *)data;

	/*header_construction */
	memset(data, 0x2b, sizeof(data));

	/* Message with URBB & URBB length */
	for (int i = 0 ; i < 20; i++) {
		hdr3->r = 0;
		hdr3->si = 0;
		hdr3->cv = 10;
		hdr3->tfi_hi = (tfi >> 3) & 0x3;
		hdr3->tfi_lo = tfi & 0x7;
		hdr3->bsn1_hi = ((i * 2)&0x1f);
		hdr3->bsn1_lo = ((i * 2)/32);
		hdr3->cps_hi = 0;
		hdr3->cps_lo = 0;
		hdr3->spb = 0;
		hdr3->rsb = 0;
		hdr3->pi = 0;
		hdr3->spare = 0;
		hdr3->dummy = 1;
		data[4] = 0x0;
		data[5] = 0x0;
		data[6] = 0x2b;
		data[7] = 0x2b;
		pdch->rcv_block(&data[0], sizeof(data), *fn, &meas);
	}
	osmo_fsm_inst_dispatch(ul_tbf->ul_ack_fsm.fi, TBF_UL_ACK_EV_SCHED_ACK, NULL);
	tbf_ul_ack_create_rlcmac_msg(ul_tbf, pdch, *fn);
	memset(data, 0x2b, sizeof(data));
	hdr3 = (struct gprs_rlc_ul_header_egprs_3 *)data;
	hdr3->r = 0;
	hdr3->si = 0;
	hdr3->cv = 0;
	hdr3->tfi_hi = (tfi >> 3) & 0x3;
	hdr3->tfi_lo = tfi & 0x7;
	hdr3->bsn1_hi = 0;
	hdr3->bsn1_lo = 2;
	hdr3->cps_hi = 0;
	hdr3->cps_lo = 0;
	hdr3->spb = 0;
	hdr3->rsb = 0;
	hdr3->pi = 0;
	hdr3->spare = 0;
	hdr3->dummy = 1;
	data[4] = 0x0;
	data[5] = 0x2b;
	data[6] = 0x2b;
	data[7] = 0x2b;

	pdch->rcv_block(&data[0], sizeof(data), *fn, &meas);
	osmo_fsm_inst_dispatch(ul_tbf->ul_ack_fsm.fi, TBF_UL_ACK_EV_SCHED_ACK, NULL);
	tbf_ul_ack_create_rlcmac_msg(ul_tbf, pdch, *fn);

	request_dl_rlc_block(ul_tbf, fn);

	check_tbf(ul_tbf);
	OSMO_ASSERT(tbf_ul_ack_fi(ul_tbf)->state == TBF_UL_ACK_ST_NONE);

	ms = bts_ms_by_tlli(bts, tlli, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms != NULL);
	OSMO_ASSERT(ms_ta(ms) == qta/4);
	OSMO_ASSERT(ms_ul_tbf(ms) == ul_tbf);

	return ul_tbf;
}

static gprs_rlcmac_ul_tbf *establish_ul_tbf_two_phase_puan_CRBB(struct gprs_rlcmac_bts *bts,
	struct gprs_rlcmac_pdch *pdch, uint32_t tlli, uint32_t *fn, uint16_t qta,
	uint8_t ms_class, uint8_t egprs_ms_class)
{
	GprsMs *ms;
	int tfi = 0;
	gprs_rlcmac_ul_tbf *ul_tbf;

	/* check the TBF */
	ul_tbf = bts_ul_tbf_by_tfi(bts, tfi, pdch->trx->trx_no, pdch->ts_no);
	OSMO_ASSERT(ul_tbf);
	OSMO_ASSERT(ul_tbf->ta() == qta / 4);

	/* send fake data with cv=0*/
	struct gprs_rlc_ul_header_egprs_3 *hdr3 = NULL;
	uint8_t data[49] = {0};

	hdr3 = (struct gprs_rlc_ul_header_egprs_3 *)data;

	/*header_construction */
	memset(data, 0x2b, sizeof(data));

	/* Message with CRBB */
	for (int i = 80 ; i < 160; i++) {
		hdr3->r = 0;
		hdr3->si = 0;
		hdr3->cv = 10;
		hdr3->tfi_hi = (tfi >> 3) & 0x3;
		hdr3->tfi_lo = tfi & 0x7;
		hdr3->bsn1_hi = ((i)&0x1f);
		hdr3->bsn1_lo = ((i)/32);
		hdr3->cps_hi = 0;
		hdr3->cps_lo = 0;
		hdr3->spb = 0;
		hdr3->rsb = 0;
		hdr3->pi = 0;
		hdr3->spare = 0;
		hdr3->dummy = 1;
		data[4] = 0x0;
		data[5] = 0x0;
		data[6] = 0x2b;
		data[7] = 0x2b;
		pdch->rcv_block(&data[0], sizeof(data), *fn, &meas);
	}
	osmo_fsm_inst_dispatch(ul_tbf->ul_ack_fsm.fi, TBF_UL_ACK_EV_SCHED_ACK, NULL);
	tbf_ul_ack_create_rlcmac_msg(ul_tbf, pdch, *fn);
	memset(data, 0x2b, sizeof(data));
	hdr3 = (struct gprs_rlc_ul_header_egprs_3 *)data;
	hdr3->r = 0;
	hdr3->si = 0;
	hdr3->cv = 0;
	hdr3->tfi_hi = (tfi >> 3) & 0x3;
	hdr3->tfi_lo = tfi & 0x7;
	hdr3->bsn1_hi = 0;
	hdr3->bsn1_lo = 2;
	hdr3->cps_hi = 0;
	hdr3->cps_lo = 0;
	hdr3->spb = 0;
	hdr3->rsb = 0;
	hdr3->pi = 0;
	hdr3->spare = 0;
	hdr3->dummy = 1;
	data[4] = 0x0;
	data[5] = 0x2b;
	data[6] = 0x2b;
	data[7] = 0x2b;

	pdch->rcv_block(&data[0], sizeof(data), *fn, &meas);

	request_dl_rlc_block(ul_tbf, fn);

	check_tbf(ul_tbf);
	OSMO_ASSERT(tbf_ul_ack_fi(ul_tbf)->state == TBF_UL_ACK_ST_NONE);

	ms = bts_ms_by_tlli(bts, tlli, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms != NULL);
	OSMO_ASSERT(ms_ta(ms) == qta/4);
	OSMO_ASSERT(ms_ul_tbf(ms) == ul_tbf);

	return ul_tbf;
}
static gprs_rlcmac_ul_tbf *establish_ul_tbf_two_phase(struct gprs_rlcmac_bts *bts,
	struct gprs_rlcmac_pdch *pdch, uint32_t tlli, uint32_t *fn, uint16_t qta,
	uint8_t ms_class, uint8_t egprs_ms_class)
{
	GprsMs *ms;
	uint32_t rach_fn = *fn - 51;
	uint32_t sba_fn = *fn + 52;
	int tfi = 0;
	gprs_rlcmac_ul_tbf *ul_tbf;
	RlcMacUplink_t ulreq = {0};

	/* needed to set last_rts_fn in the PDCH object */
	request_dl_rlc_block(bts, pdch, fn);

	/* simulate RACH, sends an Immediate Assignment Uplink on the AGCH */
	bts_handle_rach(bts, 0x73, rach_fn, qta);

	/* get next free TFI */
	tfi = bts_tfi_find_free(bts, GPRS_RLCMAC_UL_TBF, &pdch->trx->trx_no, -1);

	/* fake a resource request */
	ulreq.u.MESSAGE_TYPE = MT_PACKET_RESOURCE_REQUEST;
	ulreq.u.Packet_Resource_Request.PayloadType = GPRS_RLCMAC_CONTROL_BLOCK;
	ulreq.u.Packet_Resource_Request.ID.UnionType = 1; /* != 0 */
	ulreq.u.Packet_Resource_Request.ID.u.TLLI = tlli;
	ulreq.u.Packet_Resource_Request.Exist_MS_Radio_Access_capability2 = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		Count_MS_RA_capability_value = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		MS_RA_capability_value[0].u.Content.Exist_Multislot_capability = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		MS_RA_capability_value[0].u.Content.Multislot_capability.
		Exist_GPRS_multislot_class = 1;
	ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
		MS_RA_capability_value[0].u.Content.Multislot_capability.
		GPRS_multislot_class = ms_class;
	if (egprs_ms_class) {
		ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
			MS_RA_capability_value[0].u.Content.Multislot_capability.
			Exist_EGPRS_multislot_class = 1;
		ulreq.u.Packet_Resource_Request.MS_Radio_Access_capability2.
			MS_RA_capability_value[0].u.Content.Multislot_capability.
			EGPRS_multislot_class = ms_class;
	}

	send_ul_mac_block(bts, pdch, &ulreq, sba_fn);

	/* check the TBF */
	ul_tbf = bts_ul_tbf_by_tfi(bts, tfi, pdch->trx->trx_no, pdch->ts_no);
	OSMO_ASSERT(ul_tbf != NULL);
	OSMO_ASSERT(ul_tbf->ta() == qta / 4);

	/* send packet uplink assignment */
	*fn = sba_fn;
	request_dl_rlc_block(ul_tbf, fn);

	/* send real acknowledgement */
	send_control_ack(ul_tbf);

	check_tbf(ul_tbf);

	/* send fake data */
	uint8_t data_msg[23] = {
		0x00 | 0xf << 2, /* GPRS_RLCMAC_DATA_BLOCK << 6, CV = 15 */
		uint8_t(0 | (tfi << 1)),
		uint8_t(1), /* BSN:7, E:1 */
	};

	pdch->rcv_block(&data_msg[0], sizeof(data_msg), *fn, &meas);

	ms = bts_ms_by_tlli(bts, tlli, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms != NULL);
	OSMO_ASSERT(ms_ta(ms) == qta/4);
	OSMO_ASSERT(ms_ul_tbf(ms) == ul_tbf);

	return ul_tbf;
}

static void send_dl_data(struct gprs_rlcmac_bts *bts, uint32_t tlli, const char *imsi,
	const uint8_t *data, unsigned data_size)
{
	GprsMs *ms, *ms2;

	ms = bts_ms_store(bts)->get_ms(tlli, GSM_RESERVED_TMSI, imsi);

	dl_tbf_handle(bts, tlli, 0, imsi, 0, 0,
		1000, data, data_size);

	ms = bts_ms_by_imsi(bts, imsi);
	OSMO_ASSERT(ms != NULL);

	if (imsi[0] != '\0') {
		ms2 = bts_ms_by_tlli(bts, tlli, GSM_RESERVED_TMSI);
		OSMO_ASSERT(ms == ms2);
	}
}

static void transmit_dl_data(struct gprs_rlcmac_bts *bts, uint32_t tlli, uint32_t *fn,
	uint8_t slots = 0xff)
{
	gprs_rlcmac_dl_tbf *dl_tbf;
	GprsMs *ms;
	unsigned ts_no;

	ms = bts_ms_by_tlli(bts, tlli, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms);
	dl_tbf = ms_dl_tbf(ms);
	OSMO_ASSERT(dl_tbf);

	while (dl_tbf->have_data()) {
		uint8_t bn = fn2bn(*fn);
		for (ts_no = 0 ; ts_no < 8; ts_no += 1) {
			if (!(slots & (1 << ts_no)))
				continue;
			gprs_rlcmac_rcv_rts_block(bts,
				dl_tbf->trx->trx_no, ts_no,
				*fn, bn);
		}
		*fn = fn_add_blocks(*fn, 1);
	}
}

static inline void print_ta_tlli(const gprs_rlcmac_ul_tbf *ul_tbf, bool print_ms)
{
	fprintf(stderr, "Got '%s', TA=%d\n", ul_tbf->name(), ul_tbf->ta());
	if (print_ms)
		fprintf(stderr, "Got MS: TLLI = 0x%08x, TA = %d\n", ms_tlli(ul_tbf->ms()), ms_ta(ul_tbf->ms()));
}

static void test_tbf_single_phase()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	struct gprs_rlcmac_pdch *pdch;
	int ts_no = 7;
	uint32_t fn = DUMMY_FN; /* 17,25,9 */
	uint32_t tlli = 0xf1223344;
	const char *imsi = "0011223344";
	uint16_t qta = 31;
	gprs_rlcmac_ul_tbf *ul_tbf;

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no);
	pdch = &bts->trx[0].pdch[ts_no];

	ul_tbf = establish_ul_tbf_single_phase(bts, pdch, tlli, &fn, qta);

	print_ta_tlli(ul_tbf, true);
	send_dl_data(bts, tlli, imsi, (const uint8_t *)"TEST", 4);

	fprintf(stderr, "=== end %s ===\n", __func__);
	TALLOC_FREE(the_pcu);
}

static void test_tbf_single_phase2()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	struct gprs_rlcmac_pdch *pdch;
	int ts_no = 7;
	uint32_t fn = DUMMY_FN; /* 17,25,9 */
	uint32_t tlli = 0xf1223344;
	const char *imsi = "0011223344";
	uint16_t qta = 31;
	gprs_rlcmac_ul_tbf *ul_tbf;

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no);
	pdch = &bts->trx[0].pdch[ts_no];

	ul_tbf = establish_ul_tbf_single_phase(bts, pdch, tlli, &fn, qta);

	print_ta_tlli(ul_tbf, true);
	/* PCU sends CTRL ACK/NCK with FINAL_ACK=1, hence TBF is not in state FINISHED */
	request_dl_rlc_block(bts, pdch, &fn);
	OSMO_ASSERT(ul_tbf->state_is(TBF_ST_FINISHED));
	/* Now data is sent but no DL TBF is created because MS is not reachable for DL Assignment */
	send_dl_data(bts, tlli, imsi, (const uint8_t *)"TEST", 4);

	/* After MS CTRL ACKs the FINAL_ACK=1 then it releases the TBF and goes
	 * to packet-idle mode. Hence PCU will trigger ImmAss(PktDlAss) on PCH. */
	send_control_ack(ul_tbf);

	fprintf(stderr, "=== end %s ===\n", __func__);
	TALLOC_FREE(the_pcu);
}

static void test_tbf_egprs_two_phase_puan(void)
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	int ts_no = 7;
	struct gprs_rlcmac_pdch *pdch;
	uint32_t fn = 2654218;
	uint16_t qta = 31;
	uint32_t tlli = 0xf1223344;
	const char *imsi = "0011223344";
	uint8_t ms_class = 1;
	uint8_t egprs_ms_class = 1;
	gprs_rlcmac_ul_tbf *ul_tbf;
	uint8_t test_data[256];

	fprintf(stderr, "=== start %s ===\n", __func__);

	memset(test_data, 1, sizeof(test_data));

	setup_bts(bts, ts_no, 4);
	bts->initial_mcs_dl = 9;
	the_pcu->vty.ws_base = 128;
	the_pcu->vty.ws_pdch = 64;
	pdch = &bts->trx[0].pdch[ts_no];

	ul_tbf = establish_ul_tbf(bts, pdch, tlli, &fn, qta, ms_class, egprs_ms_class);
	/* Function to generate URBB with no length */
	ul_tbf = establish_ul_tbf_two_phase_puan_URBB_no_length(bts, pdch, tlli, &fn,
		qta, ms_class, egprs_ms_class, ul_tbf);

	print_ta_tlli(ul_tbf, true);
	send_dl_data(bts, tlli, imsi, test_data, sizeof(test_data));

	static_cast<gprs_rlc_ul_window *>(ul_tbf->window())->reset_state();
	/* Function to generate URBB with length */
	ul_tbf = establish_ul_tbf_two_phase_puan_URBB_with_length(bts, pdch, tlli, &fn,
		qta, ms_class, egprs_ms_class, ul_tbf);

	print_ta_tlli(ul_tbf, true);
	send_dl_data(bts, tlli, imsi, test_data, sizeof(test_data));

	static_cast<gprs_rlc_ul_window *>(ul_tbf->window())->reset_state();
	/* Function to generate CRBB */
	the_pcu->vty.ws_base = 128;
	the_pcu->vty.ws_pdch = 64;
	ul_tbf = establish_ul_tbf_two_phase_puan_CRBB(bts, pdch, tlli, &fn,
		qta, ms_class, egprs_ms_class);

	print_ta_tlli(ul_tbf, true);
	send_dl_data(bts, tlli, imsi, test_data, sizeof(test_data));

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}
/*
 * Trigger rach for single block
 */
static void test_immediate_assign_rej_single_block()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	uint32_t fn = 2654218;
	uint16_t qta = 31;
	int ts_no = 7;

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no, 4);

	bts->trx[0].pdch[ts_no].disable();

	uint32_t rach_fn = fn - 51;

	int rc = 0;

	/*
	 * simulate RACH, sends an Immediate Assignment
	 * Uplink reject on the AGCH
	 */
	rc = bts_handle_rach(bts, 0x70, rach_fn, qta);

	OSMO_ASSERT(rc == -EBUSY);

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

/*
 * Trigger rach till resources(USF) exhaust
 */
static void test_immediate_assign_rej_multi_block()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	uint32_t fn = 2654218;
	uint16_t qta = 31;
	int ts_no = 7;

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no, 4);

	uint32_t rach_fn = fn - 51;

	int rc = 0;

	/*
	 * simulate RACH, sends an Immediate Assignment Uplink
	 * reject on the AGCH
	 */
	rc = bts_handle_rach(bts, 0x78, rach_fn, qta);
	rc = bts_handle_rach(bts, 0x79, rach_fn, qta);
	rc = bts_handle_rach(bts, 0x7a, rach_fn, qta);
	rc = bts_handle_rach(bts, 0x7b, rach_fn, qta);
	rc = bts_handle_rach(bts, 0x7c, rach_fn, qta);
	rc = bts_handle_rach(bts, 0x7d, rach_fn, qta);
	rc = bts_handle_rach(bts, 0x7e, rach_fn, qta);
	rc = bts_handle_rach(bts, 0x7f, rach_fn, qta);

	OSMO_ASSERT(rc == -EBUSY);

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static void test_immediate_assign_rej()
{
	test_immediate_assign_rej_multi_block();
	test_immediate_assign_rej_single_block();
}

static void test_tbf_two_phase()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	int ts_no = 7;
	uint32_t fn = 2654218;
	uint16_t qta = 31;
	uint32_t tlli = 0xf1223344;
	const char *imsi = "0011223344";
	uint8_t ms_class = 1;
	gprs_rlcmac_ul_tbf *ul_tbf;

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no, 4);

	ul_tbf = establish_ul_tbf_two_phase(bts, &bts->trx[0].pdch[ts_no],
					    tlli, &fn, qta, ms_class, 0);

	print_ta_tlli(ul_tbf, true);
	send_dl_data(bts, tlli, imsi, (const uint8_t *)"TEST", 4);

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static inline void print_ms(GprsMs *ms, bool old)
{
	fprintf(stderr, "%s MS: TLLI = 0x%08x, TA = %d, IMSI = %s, LLC = %zu\n",
		old ? "Old" : "New", ms_tlli(ms), ms_ta(ms), ms_imsi(ms), llc_queue_size(ms_llc_queue(ms)));
}

static void test_tbf_ra_update_rach()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	struct gprs_rlcmac_pdch *pdch;
	int ts_no = 7;
	uint32_t fn = 2654218;
	uint16_t qta = 31;
	uint32_t tlli1 = 0xf1223344;
	uint32_t tlli2 = 0xf5667788;
	const char *imsi = "0011223344";
	uint8_t ms_class = 1;
	gprs_rlcmac_ul_tbf *ul_tbf;
	gprs_rlcmac_dl_tbf *dl_tbf;
	GprsMs *ms, *ms1, *ms2;

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no, 4);
	pdch = &bts->trx[0].pdch[ts_no];

	ul_tbf = establish_ul_tbf_two_phase(bts, pdch, tlli1, &fn, qta,
		ms_class, 0);

	ms1 = ul_tbf->ms();
	print_ta_tlli(ul_tbf, false);

	send_dl_data(bts, tlli1, imsi, (const uint8_t *)"RAU_ACCEPT", 10);
	print_ms(ms1, true);

	/* Send Packet Downlink Assignment to MS */
	request_dl_rlc_block(ul_tbf, &fn);

	/* Ack it */
	send_control_ack(ul_tbf);

	/* Make sure the RAU Accept gets sent to the MS */
	OSMO_ASSERT(llc_queue_size(ms_llc_queue(ms1)) == 1);
	transmit_dl_data(bts, tlli1, &fn);
	OSMO_ASSERT(llc_queue_size(ms_llc_queue(ms1)) == 0);

	dl_tbf = ms_dl_tbf(ms1);
	OSMO_ASSERT(dl_tbf);
	fn = get_poll_fn(dl_tbf, dl_tbf->control_ts);
	send_empty_block(dl_tbf, dl_tbf->control_ts, fn);
	fn = fn_add_blocks(fn, 1);

	/* Now establish a new TBF for the RA UPDATE COMPLETE (new TLLI) */
	ul_tbf = establish_ul_tbf_two_phase(bts, pdch, tlli2, &fn, qta,
		ms_class, 0);

	ms2 = ul_tbf->ms();

	/* The PCU cannot know yet, that both TBF belong to the same MS */
	OSMO_ASSERT(ms1 != ms2);
	print_ms(ms1, true);

	/* Send some downlink data along with the new TLLI and the IMSI so that
	 * the PCU can see, that both MS objects belong to same MS */
	send_dl_data(bts, tlli2, imsi, (const uint8_t *)"DATA", 4);

	ms = bts_ms_by_imsi(bts, imsi);
	OSMO_ASSERT(ms == ms2);

	print_ms(ms2, false);

	ms = bts_ms_by_tlli(bts, tlli1, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms == NULL);
	ms = bts_ms_by_tlli(bts, tlli2, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms == ms2);

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static void test_tbf_dl_flow_and_rach_two_phase()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	struct gprs_rlcmac_pdch *pdch;
	int ts_no = 7;
	uint32_t fn = 2654218;
	uint16_t qta = 31;
	uint32_t tlli1 = 0xf1223344;
	const char *imsi = "0011223344";
	uint8_t ms_class = 1;
	gprs_rlcmac_ul_tbf *ul_tbf;
	gprs_rlcmac_dl_tbf *dl_tbf;
	GprsMs *ms, *ms1, *ms2;

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no, 1);
	pdch = &bts->trx[0].pdch[ts_no];

	ul_tbf = establish_ul_tbf_two_phase(bts, pdch, tlli1, &fn, qta,
		ms_class, 0);

	ms1 = ul_tbf->ms();
	print_ta_tlli(ul_tbf, false);

	send_dl_data(bts, tlli1, imsi, (const uint8_t *)"DATA 1 *************", 20);
	send_dl_data(bts, tlli1, imsi, (const uint8_t *)"DATA 2 *************", 20);
	print_ms(ms1, true);

	OSMO_ASSERT(llc_queue_size(ms_llc_queue(ms1)) == 2);
	dl_tbf = ms_dl_tbf(ms1);
	OSMO_ASSERT(dl_tbf != NULL);

	/* Get rid of old UL TBF */
	tbf_free(ul_tbf);
	ms = bts_ms_by_tlli(bts, tlli1, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms1 == ms);

	/* Now establish a new UL TBF, this will consume one LLC packet */
	ul_tbf = establish_ul_tbf_two_phase(bts, pdch, tlli1, &fn, qta,
		ms_class, 0);

	ms2 = ul_tbf->ms();
	print_ms(ms2, false);

	/* This should be the same MS object */
	OSMO_ASSERT(ms2 == ms1);

	ms = bts_ms_by_tlli(bts, tlli1, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms2 == ms);

	/* A DL TBF should still exist */
	OSMO_ASSERT(ms_dl_tbf(ms));

	/* No queued packets should be lost */
	OSMO_ASSERT(llc_queue_size(ms_llc_queue(ms)) == 2);

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}


static void test_tbf_dl_flow_and_rach_single_phase()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	struct gprs_rlcmac_pdch *pdch;
	int ts_no = 7;
	uint32_t fn = 2654218;
	uint16_t qta = 31;
	uint32_t tlli1 = 0xf1223344;
	const char *imsi = "0011223344";
	uint8_t ms_class = 1;
	gprs_rlcmac_ul_tbf *ul_tbf;
	gprs_rlcmac_dl_tbf *dl_tbf;
	GprsMs *ms, *ms1, *ms2;

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no, 1);
	pdch = &bts->trx[0].pdch[ts_no];

	ul_tbf = establish_ul_tbf_two_phase(bts, pdch, tlli1, &fn, qta,
		ms_class, 0);

	ms1 = ul_tbf->ms();
	print_ta_tlli(ul_tbf, false);

	send_dl_data(bts, tlli1, imsi, (const uint8_t *)"DATA 1 *************", 20);
	send_dl_data(bts, tlli1, imsi, (const uint8_t *)"DATA 2 *************", 20);
	print_ms(ms1, true);

	OSMO_ASSERT(llc_queue_size(ms_llc_queue(ms1)) == 2);
	dl_tbf = ms_dl_tbf(ms1);
	OSMO_ASSERT(dl_tbf != NULL);

	/* Get rid of old UL TBF */
	tbf_free(ul_tbf);
	ms = bts_ms_by_tlli(bts, tlli1, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms1 == ms);

	/* Now establish a new UL TBF */
	ul_tbf = establish_ul_tbf_single_phase(bts, pdch, tlli1, &fn, qta);

	ms2 = ul_tbf->ms();
	print_ms(ms2, false);

	/* There should be a different MS object */
	OSMO_ASSERT(ms2 != ms1);

	ms = bts_ms_by_tlli(bts, tlli1, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms2 == ms);
	OSMO_ASSERT(ms1 != ms);

	/* DL TBF should be removed */
	OSMO_ASSERT(!ms_dl_tbf(ms));

	/* No queued packets should be lost */
	OSMO_ASSERT(llc_queue_size(ms_llc_queue(ms)) == 2);

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static void test_tbf_dl_reuse()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	struct gprs_rlcmac_pdch *pdch;
	int ts_no = 7;
	uint32_t fn = 2654218;
	uint16_t qta = 31;
	uint32_t tlli1 = 0xf1223344;
	const char *imsi = "0011223344";
	uint8_t ms_class = 1;
	gprs_rlcmac_ul_tbf *ul_tbf;
	gprs_rlcmac_dl_tbf *dl_tbf1, *dl_tbf2;
	GprsMs *ms1, *ms2;
	unsigned i;
	RlcMacUplink_t ulreq = {0};

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no, 1);
	pdch = &bts->trx[0].pdch[ts_no];

	ul_tbf = establish_ul_tbf_two_phase(bts, pdch, tlli1, &fn, qta,
		ms_class, 0);

	ms1 = ul_tbf->ms();
	print_ta_tlli(ul_tbf, false);

	/* Send some LLC frames */
	for (i = 0; i < 40; i++) {
		char buf[32];
		int rc;

		rc = snprintf(buf, sizeof(buf), "LLC PACKET %02i", i);
		OSMO_ASSERT(rc > 0);

		send_dl_data(bts, tlli1, imsi, (const uint8_t *)buf, rc);
	}

	print_ms(ms1, true);

	/* Send Packet Downlink Assignment to MS */
	request_dl_rlc_block(ul_tbf, &fn);

	/* Ack it */
	send_control_ack(ul_tbf);

	/* Transmit all data */
	transmit_dl_data(bts, tlli1, &fn);
	OSMO_ASSERT(llc_queue_size(ms_llc_queue(ms1)) == 0);
	OSMO_ASSERT(ms_dl_tbf(ms1));
	OSMO_ASSERT(ms_dl_tbf(ms1)->state_is(TBF_ST_FINISHED));

	dl_tbf1 = ms_dl_tbf(ms1);

	/* Send some LLC frames */
	for (i = 0; i < 10; i++) {
		char buf[32];
		int rc;

		rc = snprintf(buf, sizeof(buf), "LLC PACKET %02i (TBF 2)", i);
		OSMO_ASSERT(rc > 0);

		send_dl_data(bts, tlli1, imsi, (const uint8_t *)buf, rc);
	}

	/* Drop first DL_ACK poll queued */
	send_empty_block(dl_tbf1, dl_tbf1->control_ts, get_poll_fn(dl_tbf1, dl_tbf1->control_ts));

	/* Fake Final DL Ack/Nack */
	ulreq.u.MESSAGE_TYPE = MT_PACKET_DOWNLINK_ACK_NACK;
	Packet_Downlink_Ack_Nack_t *ack = &ulreq.u.Packet_Downlink_Ack_Nack;

	ack->PayloadType = GPRS_RLCMAC_CONTROL_BLOCK;
	ack->DOWNLINK_TFI = dl_tbf1->tfi();
	ack->Ack_Nack_Description.FINAL_ACK_INDICATION = 1;

	send_ul_mac_block(bts, dl_tbf1->control_ts, &ulreq, get_poll_fn(dl_tbf1, dl_tbf1->control_ts));

	OSMO_ASSERT(dl_tbf1->state_is(TBF_ST_WAIT_RELEASE));

	request_dl_rlc_block(dl_tbf1, &fn);

	ms2 = bts_ms_by_tlli(bts, tlli1, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms2 == ms1);
	OSMO_ASSERT(ms_dl_tbf(ms2));
	OSMO_ASSERT(ms_dl_tbf(ms2)->state_is(TBF_ST_ASSIGN));

	dl_tbf2 = ms_dl_tbf(ms2);

	OSMO_ASSERT(dl_tbf1 != dl_tbf2);

	send_control_ack(dl_tbf1);
	OSMO_ASSERT(dl_tbf2->state_is(TBF_ST_FLOW));

	/* Transmit all data */
	transmit_dl_data(bts, tlli1, &fn);
	OSMO_ASSERT(llc_queue_size(ms_llc_queue(ms2)) == 0);
	OSMO_ASSERT(ms_dl_tbf(ms2));
	OSMO_ASSERT(ms_dl_tbf(ms2)->state_is(TBF_ST_FINISHED));

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static void test_tbf_gprs_egprs()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	uint8_t ts_no = 4;
	uint8_t ms_class = 45;
	int rc = 0;
	uint32_t tlli = 0xc0006789;
	const char *imsi = "001001123456789";
	unsigned delay_csec = 1000;

	uint8_t buf[256] = {0};

	fprintf(stderr, "=== start %s ===\n", __func__);

	bts->pcu->nsi = gprs_ns2_instantiate(tall_pcu_ctx, gprs_ns_prim_cb, NULL);
	if (!bts->pcu->nsi) {
		LOGP(DBSSGP, LOGL_ERROR, "Failed to create NS instance\n");
		abort();
	}

	setup_bts(bts, ts_no);

	/* EGPRS-only */

	gprs_bssgp_init(bts, 3234, 3234, 1, 1, false, 0, 0, 0);

	/* Does not support EGPRS */
	rc = dl_tbf_handle(bts, tlli, 0, imsi, ms_class, 0,
		delay_csec, buf, sizeof(buf));

	OSMO_ASSERT(rc == 0);
	fprintf(stderr, "=== end %s ===\n", __func__);

	TALLOC_FREE(the_pcu);
}

static inline void ws_check(gprs_rlcmac_dl_tbf *dl_tbf, const char *test, uint8_t exp_slots, uint16_t exp_ws,
			    bool free)
{
	if (!dl_tbf) {
		fprintf(stderr, "%s(): FAILED (NULL TBF)\n", test);
		return;
	}

	fprintf(stderr, "DL TBF slots: 0x%02x, N: %d, WS: %d",
		dl_tbf->dl_slots(),
		pcu_bitcount(dl_tbf->dl_slots()),
		dl_tbf->window_size());

	if (pcu_bitcount(dl_tbf->dl_slots()) != exp_slots || dl_tbf->window_size() != exp_ws)
		fprintf(stderr, "%s(): DL TBF FAILED: dl_slots = %u (exp. %u), WS = %u (exp. %u)",
			test, pcu_bitcount(dl_tbf->dl_slots()), 4, dl_tbf->window_size(), 128 + 4 * 64);

	fprintf(stderr, "\n");

	if (free)
		tbf_free(dl_tbf);
}

static void test_tbf_ws()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	GprsMs *ms;
	uint8_t ts_no = 4;
	uint8_t ms_class = 12;
	gprs_rlcmac_dl_tbf *dl_tbf;

	fprintf(stderr, "=== start %s ===\n", __func__);

	bts->pcu->nsi = gprs_ns2_instantiate(tall_pcu_ctx, gprs_ns_prim_cb, NULL);
	if (!bts->pcu->nsi) {
		LOGP(DBSSGP, LOGL_ERROR, "Failed to create NS instance\n");
		abort();
	}

	setup_bts(bts, ts_no);

	the_pcu->vty.ws_base = 128;
	the_pcu->vty.ws_pdch = 64;
	the_pcu->alloc_algorithm = alloc_algorithm_b;
	bts->trx[0].pdch[2].enable();
	bts->trx[0].pdch[3].enable();
	/* bts->trx[0].pdch[4].enable(); Already enabled during setup_bts() */
	bts->trx[0].pdch[5].enable();

	gprs_bssgp_init(bts, 4234, 4234, 1, 1, false, 0, 0, 0);

	/* Does no support EGPRS */
	ms = bts_alloc_ms(bts, ms_class, 0);
	dl_tbf = dl_tbf_alloc(bts, ms, 0, false);

	ws_check(dl_tbf, __func__, 4, 64, true);

	/* EGPRS-only */

	/* Does support EGPRS */
	ms = bts_alloc_ms(bts, ms_class, ms_class);
	dl_tbf = dl_tbf_alloc(bts, ms, 0, false);

	ws_check(dl_tbf, __func__, 4, 128 + 4 * 64, true);
	fprintf(stderr, "=== end %s ===\n", __func__);
	TALLOC_FREE(the_pcu);
}

static void test_tbf_update_ws(void)
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	GprsMs *ms;
	uint8_t ts_no = 4;
	uint8_t ms_class = 11;
	gprs_rlcmac_dl_tbf *dl_tbf;

	fprintf(stderr, "=== start %s ===\n", __func__);

	bts->pcu->nsi = gprs_ns2_instantiate(tall_pcu_ctx, gprs_ns_prim_cb, NULL);
	if (!bts->pcu->nsi) {
		LOGP(DBSSGP, LOGL_ERROR, "Failed to create NS instance\n");
		abort();
	}

	setup_bts(bts, ts_no);

	the_pcu->vty.ws_base = 128;
	the_pcu->vty.ws_pdch = 64;
	the_pcu->alloc_algorithm = alloc_algorithm_b;
	bts->trx[0].pdch[2].enable();
	bts->trx[0].pdch[3].enable();
	/* bts->trx[0].pdch[4].enable(); Already enabled during setup_bts()) */
	bts->trx[0].pdch[5].enable();

	gprs_bssgp_init(bts, 5234, 5234, 1, 1, false, 0, 0, 0);

	/* EGPRS-only */

	/* Does support EGPRS */
	ms = bts_alloc_ms(bts, ms_class, ms_class);
	dl_tbf = dl_tbf_alloc(bts, ms, 0, true);

	ws_check(dl_tbf, __func__, 1, 128 + 1 * 64, false);

	OSMO_ASSERT(dl_tbf_upgrade_to_multislot(dl_tbf) == 0);

	/* window size should be 384 */
	ws_check(dl_tbf, __func__, 4, 128 + 4 * 64, true);
	fprintf(stderr, "=== end %s ===\n", __func__);
	TALLOC_FREE(the_pcu);
}

/* Test DL-TBF first assigned over CCCH ImmAss, then after X2002 timeout, when MS
is available to receive from TBF on PACCH, upgrade it to multislot. In the
middle the MS would request a new UL-TBF and PCU ends up creating 2 MS objects on
different TRX, which are eventually merged.
Hence, new multislot DL-TBF allocation (assigned over PACCH) happens on a different TRX
than the one which was assigned over CCCH and where the PktDlAss is sent. SYS#6231 */
static void test_ms_merge_dl_tbf_different_trx(void)
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	GprsMs *first_ms, *second_ms;
	uint8_t ts_no = 1;
	uint8_t ms_class = 11;
	struct gprs_rlcmac_trx *trx0 = &bts->trx[0];
	struct gprs_rlcmac_trx *trx1 = &bts->trx[1];
	uint32_t old_tlli = 0xa3c2f953;
	uint32_t new_tlli = 0xecc1f953;
	const char *imsi = "001001000000001";
	uint8_t llc_buf[19];
	int rc;
	unsigned delay_csec = 1000;
	struct gprs_rlcmac_dl_tbf *dl_tbf;
	struct gprs_rlcmac_ul_tbf *ul_tbf;
	uint32_t fn = 0;

	fprintf(stderr, "=== start %s ===\n", __func__);

	bts->pcu->nsi = gprs_ns2_instantiate(tall_pcu_ctx, gprs_ns_prim_cb, NULL);
	if (!bts->pcu->nsi) {
		LOGP(DBSSGP, LOGL_ERROR, "Failed to create NS instance\n");
		abort();
	}

	setup_bts(bts, ts_no);
	the_pcu->alloc_algorithm = alloc_algorithm_b;
	/* trx0->pdch[ts_no].enable(); Already enabled during setup_bts()) */
	trx0->pdch[ts_no].disable();
	trx1->pdch[4].enable();
	trx1->pdch[5].enable();
	trx1->pdch[6].enable();
	gprs_bssgp_init(bts, 5234, 5234, 1, 1, false, 0, 0, 0);

	/* Handle LLC frame 1. This will create the TBF we want in TRX1 and
	 * we'll have it upgrade to multislot on TRX0 later. */
	memset(llc_buf, 1, sizeof(llc_buf));
	rc = dl_tbf_handle(bts, old_tlli, 0, imsi, ms_class, 0,
			   delay_csec, llc_buf, sizeof(llc_buf));
	OSMO_ASSERT(rc >= 0);

	first_ms = bts_ms_store(bts)->get_ms(GSM_RESERVED_TMSI, GSM_RESERVED_TMSI, imsi);
	OSMO_ASSERT(first_ms);
	dl_tbf = ms_dl_tbf(first_ms);
	OSMO_ASSERT(dl_tbf);
	OSMO_ASSERT(tbf_get_trx(dl_tbf) == trx1);
	OSMO_ASSERT(dl_tbf->control_ts->trx == trx1);
	struct gprs_rlcmac_pdch *old_dl_control_ts = dl_tbf->control_ts;

	/* Enable PDCHs on TRX0 so that second_ms is allocated on TRX0: */
	trx0->pdch[1].enable();
	trx0->pdch[2].enable();
	trx0->pdch[3].enable();

	second_ms = bts_alloc_ms(bts, 0, 0);
	ms_set_tlli(second_ms, new_tlli);
	ul_tbf = ul_tbf_alloc(bts, second_ms, 0, true);
	OSMO_ASSERT(ul_tbf != NULL);
	ms_update_announced_tlli(second_ms, new_tlli);

	/* Here PCU gets to know the MS are the same and they get merged. */
	rc = dl_tbf_handle(bts, new_tlli, old_tlli, imsi, ms_class, 0,
			   delay_csec, llc_buf, sizeof(llc_buf));
	OSMO_ASSERT(rc >= 0);
	/* Here we assert DL-TBF is currently moved to the new MS, which is wrong! */
	OSMO_ASSERT(dl_tbf == ms_dl_tbf(second_ms));

	/* Here BTS would answer with data_cnf and trigger
	 * bts_rcv_imm_ass_cnf(), which would trigger TBF_EV_ASSIGN_PCUIF_CNF.
	 * That in turn would set up timer X2002. Finally, X2002 timeout
	 * moves it to ASSIGN state for multislot upgrade. We set X2002 timeout to 0 here to get
	 * immediate trigger through osmo_select_main() */
	OSMO_ASSERT(osmo_tdef_set(the_pcu->T_defs, -2002, 0, OSMO_TDEF_MS) == 0);
	osmo_fsm_inst_dispatch(ms_dl_tbf(second_ms)->state_fi, TBF_EV_ASSIGN_PCUIF_CNF, NULL);
	osmo_select_main(0);
	OSMO_ASSERT(dl_tbf == ms_dl_tbf(second_ms));
	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_ASSIGN));
	/* Here we validate DL-TBF was intially allocated in TRX1 but moved to TRX0 during multislot upgrade: */
	OSMO_ASSERT(tbf_get_trx(dl_tbf) == trx0);
	OSMO_ASSERT(old_dl_control_ts != dl_tbf->control_ts);

	/* dl_tbf is still in the list of trx1 so that the PktDlAss on the old
	 * TRX/TS can be scheduled to assign the new TRX/TS allocation: */
	OSMO_ASSERT(dl_tbf == llist_first_entry_or_null(&trx1->dl_tbfs, struct llist_item, list)->entry);

	/* get the PACCH PktDlAss for the DL-TBF: */
	request_dl_rlc_block(dl_tbf->bts, dl_tbf->control_ts, &fn);

	fprintf(stderr, "=== end %s ===\n", __func__);
	TALLOC_FREE(the_pcu);
}

static void test_tbf_puan_urbb_len(void)
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	struct gprs_rlcmac_pdch *pdch;
	int ts_no = 7;
	uint32_t fn = 2654218;
	uint16_t qta = 31;
	uint32_t tlli = 0xf1223344;
	const char *imsi = "0011223344";
	uint8_t ms_class = 1;
	uint8_t egprs_ms_class = 1;
	gprs_rlcmac_ul_tbf *ul_tbf;
	uint8_t test_data[256];

	fprintf(stderr, "=== start %s ===\n", __func__);

	memset(test_data, 1, sizeof(test_data));

	setup_bts(bts, ts_no, 4);
	bts->initial_mcs_dl = 9;
	pdch = &bts->trx[0].pdch[ts_no];

	ul_tbf = puan_urbb_len_issue(bts, pdch, tlli, &fn, qta,
		ms_class, egprs_ms_class);

	print_ta_tlli(ul_tbf, true);
	send_dl_data(bts, tlli, imsi, test_data, sizeof(test_data));

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static gprs_rlcmac_ul_tbf *tbf_li_decoding(struct gprs_rlcmac_bts *bts,
	struct gprs_rlcmac_pdch *pdch, uint32_t tlli, uint32_t *fn, uint16_t qta,
	uint8_t ms_class, uint8_t egprs_ms_class)
{
	GprsMs *ms;
	uint32_t rach_fn = *fn - 51;
	uint32_t sba_fn = *fn + 52;
	int tfi = 0;
	gprs_rlcmac_ul_tbf *ul_tbf;
	RlcMacUplink_t ulreq = {0};
	struct gprs_rlc_ul_header_egprs_3 *egprs3  = NULL;
	Packet_Resource_Request_t *presreq = NULL;
	MS_Radio_Access_capability_t *pmsradiocap = NULL;
	Multislot_capability_t *pmultislotcap = NULL;

	/* needed to set last_rts_fn in the PDCH object */
	request_dl_rlc_block(bts, pdch, fn);

	/*
	 * simulate RACH, this sends an Immediate
	 * Assignment Uplink on the AGCH
	 */
	bts_handle_rach(bts, 0x73, rach_fn, qta);

	/* get next free TFI */
	tfi = bts_tfi_find_free(bts, GPRS_RLCMAC_UL_TBF, &pdch->trx->trx_no, -1);

	/* fake a resource request */
	ulreq.u.MESSAGE_TYPE = MT_PACKET_RESOURCE_REQUEST;
	presreq = &ulreq.u.Packet_Resource_Request;
	presreq->PayloadType = GPRS_RLCMAC_CONTROL_BLOCK;
	presreq->ID.UnionType = 1; /* != 0 */
	presreq->ID.u.TLLI = tlli;
	presreq->Exist_MS_Radio_Access_capability2 = 1;
	pmsradiocap = &presreq->MS_Radio_Access_capability2;
	pmsradiocap->Count_MS_RA_capability_value = 1;
	pmsradiocap->MS_RA_capability_value[0].u.Content.
		Exist_Multislot_capability = 1;
	pmultislotcap = &pmsradiocap->MS_RA_capability_value[0].
		u.Content.Multislot_capability;

	pmultislotcap->Exist_GPRS_multislot_class = 1;
	pmultislotcap->GPRS_multislot_class = ms_class;
	if (egprs_ms_class) {
		pmultislotcap->Exist_EGPRS_multislot_class = 1;
		pmultislotcap->EGPRS_multislot_class = ms_class;
	}

	send_ul_mac_block(bts, pdch, &ulreq, sba_fn);

	/* check the TBF */
	ul_tbf = bts_ul_tbf_by_tfi(bts, tfi, pdch->trx->trx_no, pdch->ts_no);
	OSMO_ASSERT(ul_tbf);
	OSMO_ASSERT(ul_tbf->ta() == qta / 4);

	/* send packet uplink assignment */
	*fn = sba_fn;
	request_dl_rlc_block(ul_tbf, fn);

	/* send real acknowledgement */
	send_control_ack(ul_tbf);

	check_tbf(ul_tbf);

	uint8_t data_msg[49] = {0};

	ms = bts_ms_by_tlli(bts, tlli, GSM_RESERVED_TMSI);
	OSMO_ASSERT(ms != NULL);
	OSMO_ASSERT(ms_ta(ms) == qta/4);
	OSMO_ASSERT(ms_ul_tbf(ms) == ul_tbf);

	egprs3 = (struct gprs_rlc_ul_header_egprs_3 *) data_msg;
	egprs3->si = 0;
	egprs3->r = 1;
	egprs3->cv = 7;
	egprs3->tfi_hi = tfi & 0x03;
	egprs3->tfi_lo = (tfi & 0x1c) >> 2;
	egprs3->bsn1_hi = 0;
	egprs3->bsn1_lo = 0;
	egprs3->cps_hi = 1;
	data_msg[3] = 0xff;
	egprs3->pi = 0;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 0;
	egprs3->pi = 0;
	pdch->rcv_block(data_msg, 49, *fn, &meas);

	egprs3->bsn1_hi = 1;
	egprs3->bsn1_lo = 0;
	data_msg[3] = 0x7f;
	egprs3->cps_lo = 1;
	egprs3->rsb = 0;
	egprs3->spb = 0;
	egprs3->pi = 0;
	data_msg[4] = 0x2;
	data_msg[5] = 0x0;
	pdch->rcv_block(data_msg, 49, *fn, &meas);

	OSMO_ASSERT(ul_tbf->m_llc.index == 43);

	return ul_tbf;
}

static void test_tbf_li_decoding(void)
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	struct gprs_rlcmac_pdch *pdch;
	int ts_no = 7;
	uint32_t fn = 2654218;
	uint16_t qta = 31;
	uint32_t tlli = 0xf1223344;
	const char *imsi = "0011223344";
	uint8_t ms_class = 1;
	uint8_t egprs_ms_class = 1;
	gprs_rlcmac_ul_tbf *ul_tbf;
	uint8_t test_data[256];

	fprintf(stderr, "=== start %s ===\n", __func__);

	memset(test_data, 1, sizeof(test_data));

	setup_bts(bts, ts_no, 4);
	bts->initial_mcs_dl = 9;
	pdch = &bts->trx[0].pdch[ts_no];

	ul_tbf = tbf_li_decoding(bts, pdch, tlli, &fn, qta,
		ms_class, egprs_ms_class);

	print_ta_tlli(ul_tbf, true);
	send_dl_data(bts, tlli, imsi, test_data, sizeof(test_data));

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

/*
 * Test that a bit within the uncompressed bitmap whose BSN is not within
 * the transmit window shall be ignored. See section 9.1.8.2.4 of 44.060
 * version 7.27.0 Release 7.
 */
static void test_tbf_epdan_out_of_rx_window(void)
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	uint8_t ms_class = 11;
	uint8_t egprs_ms_class = 11;
	uint8_t trx_no;
	uint32_t tlli = 0xffeeddcc;
	gprs_rlcmac_dl_tbf *dl_tbf;
	int ts_no = 4;
	bitvec *block;
	uint8_t bits_data[RLC_EGPRS_MAX_WS/8];
	bitvec bits;
	int bsn_begin, bsn_end;
	EGPRS_PD_AckNack_t *ack_nack;
	RlcMacUplink_t ul_control_block;
	gprs_rlc_v_b *prlcmvb;
	gprs_rlc_dl_window *prlcdlwindow;
	int rc;

	memset(&ul_control_block, 0, sizeof(RlcMacUplink_t));

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no);
	OSMO_ASSERT(osmo_tdef_set(the_pcu->T_defs, -2031, 200, OSMO_TDEF_MS) == 0);
	/* ARQ II */
	the_pcu->vty.dl_arq_type = EGPRS_ARQ2;

	/*
	 * Simulate a message captured during over-the-air testing,
	 * where the following values were observed:
	 * v_a = 1176, vs = 1288, max sns = 2048, window size = 480.
	 */
	uint8_t data_msg[23] = {0x40, 0x20, 0x0b, 0xff, 0xd1,
				0x61, 0x00, 0x3e, 0x0e, 0x51, 0x9f,
				0xff, 0xff, 0xfb, 0x80, 0x00, 0x00,
				0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

	dl_tbf = create_dl_tbf(bts, ms_class, egprs_ms_class, &trx_no);
	ms_confirm_tlli(dl_tbf->ms(), tlli);
	prlcdlwindow = static_cast<gprs_rlc_dl_window *>(dl_tbf->window());
	prlcmvb = &prlcdlwindow->m_v_b;
	prlcdlwindow->m_v_s = 1288;
	prlcdlwindow->m_v_a = 1176;
	prlcdlwindow->set_sns(2048);
	prlcdlwindow->set_ws(480);
	prlcmvb->mark_unacked(1176);
	prlcmvb->mark_unacked(1177);
	prlcmvb->mark_unacked(1286);
	prlcmvb->mark_unacked(1287);

	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_FLOW));

	block = bitvec_alloc(23, tall_pcu_ctx);

	bitvec_unpack(block, data_msg);

	bits.data = bits_data;
	bits.data_len = sizeof(bits_data);
	bits.cur_bit = 0;

	rc = decode_gsm_rlcmac_uplink(block, &ul_control_block);
	OSMO_ASSERT(rc == 0);

	ack_nack = &ul_control_block.u.Egprs_Packet_Downlink_Ack_Nack;

	OSMO_ASSERT(prlcmvb->is_unacked(1176));
	OSMO_ASSERT(prlcmvb->is_unacked(1177));
	OSMO_ASSERT(prlcmvb->is_unacked(1286));
	OSMO_ASSERT(prlcmvb->is_unacked(1287));

	Decoding::decode_egprs_acknack_bits(
		&ack_nack->EGPRS_AckNack.Desc, &bits,
		&bsn_begin, &bsn_end, prlcdlwindow);

	dl_tbf->rcvd_dl_ack(
		ack_nack->EGPRS_AckNack.Desc.FINAL_ACK_INDICATION,
		bsn_begin, &bits);

	OSMO_ASSERT(prlcmvb->is_invalid(1176));
	OSMO_ASSERT(prlcmvb->is_invalid(1177));
	OSMO_ASSERT(prlcmvb->is_acked(1286));
	OSMO_ASSERT(prlcmvb->is_acked(1287));

	bitvec_free(block);
	tbf_free(dl_tbf);
	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static void test_tbf_egprs_two_phase_spb(void)
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	struct gprs_rlcmac_pdch *pdch;
	int ts_no = 7;
	uint32_t fn = 2654218;
	uint16_t qta = 31;
	uint32_t tlli = 0xf1223344;
	const char *imsi = "0011223344";
	uint8_t ms_class = 1;
	uint8_t egprs_ms_class = 1;
	gprs_rlcmac_ul_tbf *ul_tbf;
	uint8_t test_data[256];

	fprintf(stderr, "=== start %s ===\n", __func__);

	memset(test_data, 1, sizeof(test_data));

	setup_bts(bts, ts_no, 4);
	bts->initial_mcs_dl = 9;
	pdch = &bts->trx[0].pdch[ts_no];

	ul_tbf = establish_ul_tbf_two_phase_spb(bts, pdch, tlli, &fn, qta,
		ms_class, egprs_ms_class);

	print_ta_tlli(ul_tbf, true);
	send_dl_data(bts, tlli, imsi, test_data, sizeof(test_data));

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static void test_tbf_egprs_two_phase()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	struct gprs_rlcmac_pdch *pdch;
	int ts_no = 7;
	uint32_t fn = 2654218;
	uint16_t qta = 31;
	uint32_t tlli = 0xf1223344;
	const char *imsi = "0011223344";
	uint8_t ms_class = 1;
	uint8_t egprs_ms_class = 1;
	gprs_rlcmac_ul_tbf *ul_tbf;
	uint8_t test_data[256];

	fprintf(stderr, "=== start %s ===\n", __func__);

	memset(test_data, 1, sizeof(test_data));

	setup_bts(bts, ts_no, 4);
	bts->initial_mcs_dl = 9;
	pdch = &bts->trx[0].pdch[ts_no];

	ul_tbf = establish_ul_tbf_two_phase(bts, pdch, tlli, &fn, qta,
		ms_class, egprs_ms_class);

	print_ta_tlli(ul_tbf, true);
	send_dl_data(bts, tlli, imsi, test_data, sizeof(test_data));

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static void establish_and_use_egprs_dl_tbf(struct gprs_rlcmac_bts *bts, int mcs)
{
	unsigned i;
	uint8_t ms_class = 11;
	uint8_t egprs_ms_class = 11;
	uint32_t fn = 0;
	uint8_t trx_no;
	uint32_t tlli = 0xffeeddcc;
	uint8_t test_data[512];

	uint8_t rbb[64/8];

	gprs_rlcmac_dl_tbf *dl_tbf;

	fprintf(stderr, "Testing MCS-%d\n", mcs);

	memset(test_data, 1, sizeof(test_data));
	bts->initial_mcs_dl = mcs;

	dl_tbf = create_dl_tbf(bts, ms_class, egprs_ms_class, &trx_no);
	ms_confirm_tlli(dl_tbf->ms(), tlli);

	for (i = 0; i < sizeof(llc_data); i++)
		llc_data[i] = i%256;

	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_FLOW));

	/* Schedule a small LLC frame */
	ms_append_llc_dl_data(dl_tbf->ms(), 1000, test_data, 10);

	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_FLOW));

	/* Drain the queue */
	while (dl_tbf->have_data()) {
		/* Request to send one RLC/MAC block */
		request_dl_rlc_block(dl_tbf, &fn);
	}
	send_empty_block(dl_tbf, dl_tbf->control_ts, fn);

	/* Schedule a large LLC frame */
	ms_append_llc_dl_data(dl_tbf->ms(), 1000, test_data, sizeof(test_data));

	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_FLOW));

	/* Drain the queue */
	while (dl_tbf->have_data()) {
		/* Request to send one RLC/MAC block */
		request_dl_rlc_block(dl_tbf, &fn);
	}
	send_empty_block(dl_tbf, dl_tbf->control_ts, fn);

	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_FLOW));

	_rcv_ack(true, dl_tbf, rbb); /* Receive a final ACK */

	/* Clean up and ensure tbfs are in the correct state */
	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_WAIT_RELEASE));
	check_tbf(dl_tbf);
	tbf_free(dl_tbf);
}

static gprs_rlcmac_dl_tbf *tbf_init(struct gprs_rlcmac_bts *bts,
		int mcs)
{
	unsigned i;
	uint8_t ms_class = 11;
	uint8_t egprs_ms_class = 11;
	uint8_t trx_no;
	uint32_t tlli = 0xffeeddcc;
	uint8_t test_data[512];

	gprs_rlcmac_dl_tbf *dl_tbf;

	memset(test_data, 1, sizeof(test_data));
	bts->initial_mcs_dl = mcs;

	dl_tbf = create_dl_tbf(bts, ms_class, egprs_ms_class, &trx_no);
	ms_confirm_tlli(dl_tbf->ms(), tlli);

	for (i = 0; i < sizeof(test_data); i++)
		test_data[i] = i%256;

	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_FLOW));

	/* Schedule a LLC frame
	 * passing only 100 bytes, since it is enough to construct
	 * 2 RLC data blocks. Which are enough to test Header Type 1
	 * cases
	 */
	ms_append_llc_dl_data(dl_tbf->ms(), 1000, test_data, 100);

	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_FLOW));

	return dl_tbf;

}

static void tbf_cleanup(gprs_rlcmac_dl_tbf *dl_tbf)
{
	uint8_t rbb[64/8];

	_rcv_ack(true, dl_tbf, rbb); /* Receive a final ACK */

	/* Clean up and ensure tbfs are in the correct state */
	OSMO_ASSERT(dl_tbf->state_is(TBF_ST_WAIT_RELEASE));
	check_tbf(dl_tbf);
	tbf_free(dl_tbf);

}

#define NACK(tbf, x) do {					\
		gprs_rlc_dl_window *w = static_cast<gprs_rlc_dl_window *>(tbf->window());	\
		w->m_v_b.mark_nacked(x);		\
		OSMO_ASSERT(w->m_v_b.is_nacked(x));	\
	} while(0)

#define CHECK_UNACKED(tbf, cs, bsn) do {				             \
		gprs_rlc_dl_window *w = static_cast<gprs_rlc_dl_window *>(tbf->window());	\
		OSMO_ASSERT(w->m_v_b.is_unacked(bsn));	             \
		OSMO_ASSERT(mcs_chan_code(tbf->m_rlc.block(bsn)->cs_current_trans) == cs - 1); \
	} while(0)

#define CHECK_NACKED(tbf, cs, bsn) do {					             \
		gprs_rlc_dl_window *w = static_cast<gprs_rlc_dl_window *>(tbf->window());	\
		OSMO_ASSERT(w->m_v_b.is_nacked(bsn));	             \
		OSMO_ASSERT(mcs_chan_code(tbf->m_rlc.block(bsn)->cs_current_trans) == cs - 1); \
	} while(0)

#define MAKE_ACKED(m, tbf, fn, cs, check_unacked) do {			\
		m = tbf->create_dl_acked_block(fn, tbf->control_ts);	\
		OSMO_ASSERT(m);						\
		if (check_unacked)					\
			CHECK_UNACKED(tbf, cs, 0);			\
		else							\
			CHECK_NACKED(tbf, cs, 0);			\
	} while(0)

static void egprs_spb_to_normal_validation(struct gprs_rlcmac_bts *bts,
		unsigned int mcs, unsigned int demanded_mcs)
{
	uint32_t fn = 0;
	gprs_rlcmac_dl_tbf *dl_tbf;
	uint16_t bsn1, bsn2, bsn3;
	struct msgb *msg;
	struct gprs_rlc_dl_header_egprs_3 *egprs3;
	struct gprs_rlc_dl_header_egprs_2 *egprs2;

	fprintf(stderr, "Testing retx for MCS %u to reseg_mcs %u\n", mcs, demanded_mcs);

	dl_tbf = tbf_init(bts, mcs);

	/*
	 * Table 10.4.8a.3.1 of 44.060.
	 * (MCS7, MCS9) to (MCS2, MCS3) is not handled since it is same as
	 * (MCS5, MCS6) to (MCS2, MCS3) transition
	 */
	if (!(mcs == 6 && demanded_mcs == 3))
		return;

	fn = fn_add_blocks(fn, 1);
	/* Send first RLC data block BSN 0 */
	MAKE_ACKED(msg, dl_tbf, fn, mcs, true);

	egprs2 = (struct gprs_rlc_dl_header_egprs_2 *) msg->data;
	bsn1 = (egprs2->bsn1_hi << 9) | (egprs2->bsn1_mid << 1) | (egprs2->bsn1_lo);

	NACK(dl_tbf, 0);

	OSMO_ASSERT(bsn1 == 0);

	ms_set_current_cs_dl(dl_tbf->ms(), static_cast < enum CodingScheme > (CS4 + demanded_mcs));

	fn = fn_add_blocks(fn, 1);

	/* Send first segment with demanded_mcs */
	MAKE_ACKED(msg, dl_tbf, fn, demanded_mcs, false);
	OSMO_ASSERT(dl_tbf->m_rlc.block(0)->spb_status.block_status_dl
			== EGPRS_RESEG_FIRST_SEG_SENT);

	egprs3 = (struct gprs_rlc_dl_header_egprs_3 *) msg->data;
	OSMO_ASSERT(egprs3->spb == 2);

	/* Table 10.4.8a.3.1 of 44.060 */
	OSMO_ASSERT(egprs3->cps == 3);

	/* Send second segment with demanded_mcs */
	MAKE_ACKED(msg, dl_tbf, fn, demanded_mcs, true);
	OSMO_ASSERT(dl_tbf->m_rlc.block(0)->spb_status.block_status_dl
			== EGPRS_RESEG_SECOND_SEG_SENT);

	egprs3 = (struct gprs_rlc_dl_header_egprs_3 *) msg->data;
	/* Table 10.4.8a.3.1 of 44.060 */
	OSMO_ASSERT(egprs3->spb == 3);
	bsn2 = (egprs3->bsn1_hi << 9) | (egprs3->bsn1_mid << 1) | (egprs3->bsn1_lo);
	OSMO_ASSERT(bsn2 == bsn1);

	/* Table 10.4.8a.3.1 of 44.060 */
	OSMO_ASSERT(egprs3->cps == 3);

	/* Handle (MCS3, MCS3) -> MCS6 case */
	ms_set_current_cs_dl(dl_tbf->ms(), static_cast < enum CodingScheme > (CS4 + mcs));

	NACK(dl_tbf, 0);

	msg = dl_tbf->create_dl_acked_block(fn, dl_tbf->control_ts);
	egprs2 = (struct gprs_rlc_dl_header_egprs_2 *) msg->data;

	/* Table 10.4.8a.3.1 of 44.060 */
	OSMO_ASSERT(egprs2->cps == 0);
	bsn3 = (egprs2->bsn1_hi << 9) | (egprs2->bsn1_mid << 1) | (egprs2->bsn1_lo);
	OSMO_ASSERT(bsn3 == bsn2);

	tbf_cleanup(dl_tbf);
}

static void establish_and_use_egprs_dl_tbf_for_spb(struct gprs_rlcmac_bts *bts,
		unsigned int mcs, unsigned int demanded_mcs)
{
	uint32_t fn = 0;
	gprs_rlcmac_dl_tbf *dl_tbf;
	struct msgb *msg;
	struct gprs_rlc_dl_header_egprs_3 *egprs3;

	fprintf(stderr, "Testing retx for MCS %u to reseg_mcs %u\n", mcs, demanded_mcs);

	dl_tbf = tbf_init(bts, mcs);

	/*
	 * Table 10.4.8a.3.1 of 44.060.
	 * (MCS7, MCS9) to (MCS2, MCS3) is not handled since it is same as
	 * (MCS5, MCS6) to (MCS2, MCS3) transition
	 */
	/* TODO: Need to support of MCS8 -> MCS6 ->MCS3 transistion
	 * Refer commit be881c028fc4da00c4046ecd9296727975c206a3
	 * dated 2016-02-07 23:45:40 (UTC)
	 */
	if (!(((mcs == 5) && (demanded_mcs == 2)) ||
		((mcs == 6) && (demanded_mcs == 3)) ||
		((mcs == 4) && (demanded_mcs == 1))))
		return;

	fn = fn_add_blocks(fn, 1);
	/* Send first RLC data block BSN 0 */
	MAKE_ACKED(msg, dl_tbf, fn, mcs, true);

	NACK(dl_tbf, 0);

	ms_set_current_cs_dl(dl_tbf->ms(), static_cast < enum CodingScheme > (CS4 + demanded_mcs));

	fn = fn_add_blocks(fn, 1);

	/* Send first segment with demanded_mcs */
	MAKE_ACKED(msg, dl_tbf, fn, demanded_mcs, false);
	OSMO_ASSERT(dl_tbf->m_rlc.block(0)->spb_status.block_status_dl
			== EGPRS_RESEG_FIRST_SEG_SENT);

	egprs3 = (struct gprs_rlc_dl_header_egprs_3 *) msg->data;
	OSMO_ASSERT(egprs3->spb == 2);

	/* Table 10.4.8a.3.1 of 44.060 */
	switch (demanded_mcs) {
	case 3:
		OSMO_ASSERT(egprs3->cps == 3);
		break;
	case 2:
		OSMO_ASSERT(egprs3->cps == 9);
		break;
	case 1:
		OSMO_ASSERT(egprs3->cps == 11);
		break;
	default:
		OSMO_ASSERT(false);
		break;
	}

	/* Send second segment with demanded_mcs */
	MAKE_ACKED(msg, dl_tbf, fn, demanded_mcs, true);
	OSMO_ASSERT(dl_tbf->m_rlc.block(0)->spb_status.block_status_dl
			== EGPRS_RESEG_SECOND_SEG_SENT);

	egprs3 = (struct gprs_rlc_dl_header_egprs_3 *) msg->data;
	/* Table 10.4.8a.3.1 of 44.060 */
	OSMO_ASSERT(egprs3->spb == 3);

	/* Table 10.4.8a.3.1 of 44.060 */
	switch (demanded_mcs) {
	case 3:
		OSMO_ASSERT(egprs3->cps == 3);
		break;
	case 2:
		OSMO_ASSERT(egprs3->cps == 9);
		break;
	case 1:
		OSMO_ASSERT(egprs3->cps == 11);
		break;
	default:
		OSMO_ASSERT(false);
		break;
	}
	tbf_cleanup(dl_tbf);
}

static void establish_and_use_egprs_dl_tbf_for_retx(struct gprs_rlcmac_bts *bts,
		unsigned int mcs, unsigned int demanded_mcs)
{
	uint32_t fn = 0;
	gprs_rlcmac_dl_tbf *dl_tbf;
	struct msgb *msg;

	fprintf(stderr, "Testing retx for MCS %u - %u\n", mcs, demanded_mcs);

	dl_tbf = tbf_init(bts, mcs);

	/* For MCS reduction cases like MCS9->MCS6, MCS7->MCS5
	 * The MCS transition are referred from table Table 8.1.1.2
	 * of TS 44.060
	 */
	/* TODO: Need to support of MCS8 -> MCS6 transistion
	 * Refer commit be881c028fc4da00c4046ecd9296727975c206a3
	 * dated 2016-02-07 23:45:40 (UTC)
	 */
	if (((mcs == 9) && (demanded_mcs < 9)) ||
		((mcs == 7) && (demanded_mcs < 7))) {
		fn = fn_add_blocks(fn, 1);
		/* Send 2 RLC data block */
		MAKE_ACKED(msg, dl_tbf, fn, mcs, true);
		CHECK_UNACKED(dl_tbf, mcs, 1);

		NACK(dl_tbf, 0);
		NACK(dl_tbf, 1);

		/* Set the demanded MCS to demanded_mcs */
		ms_set_current_cs_dl(dl_tbf->ms(), static_cast < enum CodingScheme > (CS4 + demanded_mcs));

		fn = fn_add_blocks(fn, 1);
		/* Retransmit the first RLC data block with demanded_mcs */
		MAKE_ACKED(msg, dl_tbf, fn, demanded_mcs, true);
		CHECK_NACKED(dl_tbf, mcs, 1);

		fn = fn_add_blocks(fn, 1);
		/* Retransmit the second RLC data block with demanded_mcs */
		MAKE_ACKED(msg, dl_tbf, fn, demanded_mcs, true);
		CHECK_UNACKED(dl_tbf, demanded_mcs, 1);
	} else if (((mcs == 5) && (demanded_mcs > 6)) ||
		((mcs == 6) && (demanded_mcs > 8))) {
		fn = fn_add_blocks(fn, 1);
		/* Send first RLC data block BSN 0 */
		MAKE_ACKED(msg, dl_tbf, fn, mcs, true);

		fn = fn_add_blocks(fn, 1);
		/* Send second RLC data block BSN 1 */
		MAKE_ACKED(msg, dl_tbf, fn, mcs, true);
		CHECK_UNACKED(dl_tbf, mcs, 1);

		NACK(dl_tbf, 0);
		NACK(dl_tbf, 1);

		ms_set_current_cs_dl(dl_tbf->ms(), static_cast < enum CodingScheme > (CS4 + demanded_mcs));

		fn = fn_add_blocks(fn, 1);
		/* Send first, second RLC data blocks with demanded_mcs */
		MAKE_ACKED(msg, dl_tbf, fn, demanded_mcs, true);
		CHECK_UNACKED(dl_tbf, demanded_mcs, 1);
	} else if (mcs > 6) {
		/* No Mcs change cases are handled here for mcs > MCS6*/
		fn = fn_add_blocks(fn, 1);
		/* Send first,second RLC data blocks */
		MAKE_ACKED(msg, dl_tbf, fn, mcs, true);
		CHECK_UNACKED(dl_tbf, mcs, 1);

		NACK(dl_tbf, 0);
		NACK(dl_tbf, 1);

		fn = fn_add_blocks(fn, 1);
		/* Send first,second RLC data blocks with demanded_mcs*/
		MAKE_ACKED(msg, dl_tbf, fn, mcs, true);
		CHECK_UNACKED(dl_tbf, mcs, 1);
	} else {

		/* No MCS change cases are handled here for mcs <= MCS6*/
		fn = fn_add_blocks(fn, 1);
		/* Send first RLC data block */
		MAKE_ACKED(msg, dl_tbf, fn, mcs, true);

		NACK(dl_tbf, 0);

		fn = fn_add_blocks(fn, 1);
		/* Send first RLC data block with demanded_mcs */
		MAKE_ACKED(msg, dl_tbf, fn, mcs, true);
	}
	/* Clean up pending items in UL controller: */
	send_empty_block(dl_tbf, dl_tbf->control_ts, fn+50);
	tbf_cleanup(dl_tbf);
}

static void test_tbf_egprs_retx_dl(void)
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	uint8_t ts_no = 4;

	fprintf(stderr, "=== start %s ===\n", __func__);

	the_pcu->vty.cs_downgrade_threshold = 0;
	setup_bts(bts, ts_no);
	OSMO_ASSERT(osmo_tdef_set(the_pcu->T_defs, -2031, 200, OSMO_TDEF_MS) == 0);
	/* ARQ II */
	the_pcu->vty.dl_arq_type = EGPRS_ARQ2;


	/* First parameter is current MCS, second one is demanded_mcs */
	establish_and_use_egprs_dl_tbf_for_retx(bts, 6, 6);
	establish_and_use_egprs_dl_tbf_for_retx(bts, 1, 9);
	establish_and_use_egprs_dl_tbf_for_retx(bts, 2, 8);
	establish_and_use_egprs_dl_tbf_for_retx(bts, 5, 7);
	establish_and_use_egprs_dl_tbf_for_retx(bts, 6, 9);
	establish_and_use_egprs_dl_tbf_for_retx(bts, 7, 5);
	establish_and_use_egprs_dl_tbf_for_retx(bts, 9, 6);

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static void test_tbf_egprs_spb_dl(void)
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	uint8_t ts_no = 4;

	fprintf(stderr, "=== start %s ===\n", __func__);

	the_pcu->vty.cs_downgrade_threshold = 0;
	setup_bts(bts, ts_no);
	OSMO_ASSERT(osmo_tdef_set(the_pcu->T_defs, -2031, 200, OSMO_TDEF_MS) == 0);

	/* ARQ I resegmentation support */
	the_pcu->vty.dl_arq_type = EGPRS_ARQ1;

	/*
	 * First parameter is current MCS, second one is demanded_mcs
	 * currently only MCS5->MCS2, MCS6->3, MCS4->MCS1 is tested in UT
	 * rest scenarios has been integration tested
	 */
	establish_and_use_egprs_dl_tbf_for_spb(bts, 6, 3);
	establish_and_use_egprs_dl_tbf_for_spb(bts, 5, 2);
	establish_and_use_egprs_dl_tbf_for_spb(bts, 4, 1);
	/* check MCS6->(MCS3+MCS3)->MCS6 case */
	egprs_spb_to_normal_validation(bts, 6, 3);

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static void test_tbf_egprs_dl()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	uint8_t ts_no = 4;
	int i;

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no);
	OSMO_ASSERT(osmo_tdef_set(the_pcu->T_defs, -2031, 200, OSMO_TDEF_MS) == 0);
	/* ARQ II */
	the_pcu->vty.dl_arq_type = EGPRS_ARQ2;

	for (i = 1; i <= 9; i++)
		establish_and_use_egprs_dl_tbf(bts, i);

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}



static void test_packet_access_rej_prr_no_other_tbfs()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	struct gprs_rlcmac_pdch *pdch;
	uint32_t fn = 2654218;
	int ts_no = 7;
	uint8_t trx_no = 0;
	uint32_t tlli = 0xffeeddcc;
	struct gprs_rlcmac_ul_tbf *ul_tbf;
	struct GprsMs *ms;

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no, 4);
	pdch = &bts->trx[trx_no].pdch[ts_no];
	OSMO_ASSERT(osmo_tdef_set(the_pcu->T_defs, -2000, 0, OSMO_TDEF_MS) == 0);

	int rc = 0;

	ms = bts_alloc_ms(bts, 0, 0);
	ms_set_tlli(ms, tlli);
	ul_tbf = ms_new_ul_tbf_rejected_pacch(ms, pdch);

	OSMO_ASSERT(ul_tbf != 0);

	/* trigger packet access reject */
	uint8_t bn = fn2bn(fn);

	rc = gprs_rlcmac_rcv_rts_block(bts, pdch->trx->trx_no, pdch->ts_no, fn, bn);

	OSMO_ASSERT(rc == 0);
	osmo_select_main(0);

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

static void test_packet_access_rej_prr()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	struct gprs_rlcmac_pdch *pdch;
	uint32_t fn = 2654218;
	uint16_t qta = 31;
	int ts_no = 7;
	uint8_t trx_no = 0;
	RlcMacUplink_t ulreq = {0};
	Packet_Resource_Request_t *presreq = NULL;
	uint8_t ms_class = 11;
	uint8_t egprs_ms_class = 11;
	uint32_t rach_fn = fn - 51;
	uint32_t sba_fn = fn + 52;
	uint32_t tlli = 0xffeeddcc;
	MS_Radio_Access_capability_t *pmsradiocap = NULL;
	Multislot_capability_t *pmultislotcap = NULL;

	fprintf(stderr, "=== start %s ===\n", __func__);

	setup_bts(bts, ts_no, 4);
	pdch = &bts->trx[trx_no].pdch[ts_no];

	int rc = 0;

	/*
	 * Trigger rach till resources(USF) exhaust
	 */
	int i;
	for (i = 0; i < 8; i++) {
		rc = bts_handle_rach(bts, 0x70 + i, rach_fn, qta);
	}

	sba_fn = 52;
	for (i = 0; i < 8; i++) {
		/* fake a resource request */
		ulreq.u.MESSAGE_TYPE = MT_PACKET_RESOURCE_REQUEST;
		presreq = &ulreq.u.Packet_Resource_Request;
		presreq->PayloadType = GPRS_RLCMAC_CONTROL_BLOCK;
		presreq->ID.UnionType = 1; /* != 0 */
		presreq->ID.u.TLLI = tlli + i;
		presreq->Exist_MS_Radio_Access_capability2 = 1;
		pmsradiocap = &presreq->MS_Radio_Access_capability2;
		pmsradiocap->Count_MS_RA_capability_value = 1;
		pmsradiocap->MS_RA_capability_value[0].u.Content.
			Exist_Multislot_capability = 1;
		pmultislotcap = &pmsradiocap->MS_RA_capability_value[0].
			u.Content.Multislot_capability;

		pmultislotcap->Exist_GPRS_multislot_class = 1;
		pmultislotcap->GPRS_multislot_class = ms_class;
		if (egprs_ms_class) {
			pmultislotcap->Exist_EGPRS_multislot_class = 1;
			pmultislotcap->EGPRS_multislot_class = egprs_ms_class;
		}

		send_ul_mac_block(bts, pdch, &ulreq, sba_fn);
		sba_fn = fn_next_block(sba_fn);

		/* trigger packet access reject */
		uint8_t bn = fn2bn(fn);

		rc = gprs_rlcmac_rcv_rts_block(bts, pdch->trx->trx_no, pdch->ts_no, fn, bn);
		OSMO_ASSERT(rc == 0);
	}

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}

void test_packet_access_rej_epdan()
{
	the_pcu = prepare_pcu();
	struct gprs_rlcmac_bts *bts = bts_alloc(the_pcu, 0);
	uint32_t tlli = 0xffeeddcc;
	static uint8_t exp[] = { 0x40, 0x84, 0x7f, 0xf7, 0x6e, 0xe6, 0x7e, 0xab,
				 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b,
				 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b, 0x2b
	};

	fprintf(stderr, "=== start %s ===\n", __func__);
	setup_bts(bts, 4);
	static gprs_rlcmac_dl_tbf *dl_tbf = tbf_init(bts, 1);

	ms_confirm_tlli(dl_tbf->ms(), tlli);

	osmo_fsm_inst_dispatch(dl_tbf->ul_ass_fsm.fi, TBF_UL_ASS_EV_SCHED_ASS_REJ, NULL);
	struct msgb *msg = tbf_ul_ass_create_rlcmac_msg((const struct gprs_rlcmac_tbf*)dl_tbf, 0, 0);

	fprintf(stderr, "packet reject: %s\n",
			osmo_hexdump(msg->data, 23));

	if (!msgb_eq_data_print(msg, exp, GSM_MACBLOCK_LEN))
		fprintf(stderr, "%s test failed!\n", __func__);

	TALLOC_FREE(the_pcu);
	fprintf(stderr, "=== end %s ===\n", __func__);
}


int main(int argc, char **argv)
{
	struct vty_app_info pcu_vty_info = {0};

	tall_pcu_ctx = talloc_named_const(NULL, 1, "moiji-mobile TbfTest context");
	if (!tall_pcu_ctx)
		abort();

	msgb_talloc_ctx_init(tall_pcu_ctx, 0);
	osmo_init_logging2(tall_pcu_ctx, &gprs_log_info);
	log_set_use_color(osmo_stderr_target, 0);
	log_set_print_filename2(osmo_stderr_target, LOG_FILENAME_NONE);
	log_set_print_category(osmo_stderr_target, 0);
	log_set_print_category_hex(osmo_stderr_target, 0);
	log_parse_category_mask(osmo_stderr_target, "DRLCMAC,1:DRLCMACDATA,3:DRLCMACDL,3:DRLCMACUL,3:"
				"DRLCMACSCHED,1:DRLCMACMEAS,3:DNS,3:DLBSSGP,3:DPCU,5:"
				"DL1IF,6:DTBF,1:DTBFUL,1:DTBFDL,1:DLGLOBAL,2:");
	osmo_fsm_log_addr(false);
	vty_init(&pcu_vty_info);
	pcu_vty_init();

	/* Initialize shared UL measurements */
	pcu_l1_meas_set_link_qual(&meas, 12);
	pcu_l1_meas_set_rssi(&meas, 31);

	test_tbf_base();
	test_tbf_tlli_update();
	test_tbf_final_ack(TEST_MODE_STANDARD);
	test_tbf_final_ack(TEST_MODE_REVERSE_FREE);
	test_tbf_delayed_release();
	test_tbf_imsi();
	test_tbf_exhaustion();
	test_tbf_dl_llc_loss();
	test_tbf_single_phase();
	test_tbf_single_phase2();
	test_tbf_two_phase();
	test_tbf_ra_update_rach();
	test_tbf_dl_flow_and_rach_two_phase();
	test_tbf_dl_flow_and_rach_single_phase();
	test_tbf_dl_reuse();
	test_tbf_gprs_egprs();
	test_tbf_ws();
	test_tbf_egprs_two_phase();
	test_tbf_egprs_two_phase_spb();
	test_tbf_egprs_dl();
	test_tbf_egprs_retx_dl();
	test_tbf_egprs_spb_dl();
	test_tbf_puan_urbb_len();
	test_tbf_update_ws();
	test_tbf_li_decoding();
	test_tbf_epdan_out_of_rx_window();
	test_immediate_assign_rej();
	test_tbf_egprs_two_phase_puan();
	test_packet_access_rej_epdan();
	test_packet_access_rej_prr();
	test_packet_access_rej_prr_no_other_tbfs();
	test_ms_merge_dl_tbf_different_trx();

	if (getenv("TALLOC_REPORT_FULL"))
		talloc_report_full(tall_pcu_ctx, stderr);
	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(); }
}