bsc: add TC_ms_rel_ind_does_not_cause_bssmap_reset

bsc: add TC_bssmap_clear_does_not_cause_bssmap_reset(), but the same triggered
by an MS Rel Ind and a BSSMAP Clear Request sent to the MSC first.

This test will only succeed once TC_chan_rel_rll_rel_ind() succeeds, i.e. with
below osmo-bsc fix.

Related: OS#3041
Depends: I0f8c9c4e6b6850b15c70250fd3f88bdf75f9accf (osmo-bsc)
Change-Id: Ie4aa2f01c83b40303fa40ed64dbfce372b7cd96c

1 files changed, 63 insertions, 0 deletions

diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 3b5c8600..972d912a 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -1820,6 +1820,68 @@ testcase TC_bssmap_clear_does_not_cause_bssmap_reset() runs on test_CT {
 	f_shutdown_helper();
 }
 
+/* OS#3041: Open and close N connections in a normal fashion, and expect no
+ * BSSMAP Reset just because of that. Close connections from the MS side with a
+ * Release Ind on RSL. */
+testcase TC_ms_rel_ind_does_not_cause_bssmap_reset() runs on test_CT {
+	var default d;
+	var integer i;
+	var DchanTuple dt;
+	var BSSAP_N_DATA_ind rx_di;
+	var RSL_Message rx_rsl;
+	var integer j;
+
+	f_init();
+
+	/* Wait for initial BSSMAP Reset to pass */
+	f_sleep(4.0);
+
+	d := activate(no_bssmap_reset());
+
+	/* Setup up a number of connections and RLSD them again from the MSC
+	 * side. In the buggy behavior, the fourth one triggers BSSMAP Reset.
+	 * Let's do it some more times for good measure. */
+	for (i := 0; i < 8; i := i+1) {
+		/* Since we're doing a lot of runs, give each one a fresh
+		 * T_guard from the top. */
+		T_guard.start;
+
+		/* Setup a BSSAP connection and clear it right away. This is
+		 * the MSC telling the BSC about a planned release, it's not an
+		 * erratic loss of a connection. */
+		dt := f_est_dchan('23'O, 23, '00010203040506'O);
+
+		/* simulate RLL REL IND */
+		f_ipa_tx(0, ts_RSL_REL_IND(dt.rsl_chan_nr, valueof(ts_RslLinkID_DCCH(0))));
+
+		/* expect Clear Request on MSC side */
+		BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_ClearRequest)) -> value rx_di;
+
+		/* Instruct BSC to clear channel */
+		var BssmapCause cause := bit2int(rx_di.userData.pdu.bssmap.clearRequest.cause.causeValue);
+		BSSAP.send(ts_BSSAP_DATA_req(dt.sccp_conn_id, ts_BSSMAP_ClearCommand(cause)));
+
+		/* expect BSC to disable the channel */
+		rx_rsl := f_exp_ipa_rx(0, tr_RSL_MsgTypeD(RSL_MT_RF_CHAN_REL), T3101_MAX);
+		/* respond with CHAN REL ACK */
+		f_ipa_tx(0, ts_RSL_RF_CHAN_REL_ACK(dt.rsl_chan_nr));
+
+		/* expect Clear Complete from BSC */
+		BSSAP.receive(tr_BSSAP_DATA_ind(dt.sccp_conn_id, tr_BSSMAP_ClearComplete));
+
+		/* MSC disconnects as instructed. */
+		BSSAP.send(ts_BSSAP_DISC_req(dt.sccp_conn_id, 0));
+	}
+
+	/* In the buggy behavior, a timeout of 2 seconds happens between above
+	 * trigger (logs "SIGTRAN connection down, reconnecting...") and the
+	 * actual BSSMAP Reset. Wait a bit longer just to make sure. */
+	f_sleep(4.0);
+
+	deactivate(d);
+	f_shutdown_helper();
+}
+
 control {
 	/* CTRL interface testing */
 	execute( TC_ctrl_msc_connection_status() );
@@ -1896,6 +1958,7 @@ control {
 
 	execute( TC_bssap_rlsd_does_not_cause_bssmap_reset() );
 	execute( TC_bssmap_clear_does_not_cause_bssmap_reset() );
+	execute( TC_ms_rel_ind_does_not_cause_bssmap_reset() );
 }
 
 }