test/multipath: add logical unit reset test

This test issues a logical unit reset iSCSI TMF request, and then
confirms that all paths report a subsequent unit attention condition.

Signed-off-by: David Disseldorp <ddiss@suse.de>

test-tool/Makefile.am

@@ -215,7 +215,8 @@ iscsi_test_cu_SOURCES = iscsi-test-cu.c \
 	test_writeverify16_flags.c \
 	test_writeverify16_dpo.c \
 	test_writeverify16_residuals.c \
-	test_multipathio_simple.c
+	test_multipathio_simple.c \
+	test_multipathio_reset.c
 
 endif
 

test-tool/iscsi-test-cu.c

@@ -445,6 +445,7 @@ static CU_TestInfo tests_writeverify16[] = {
 
 static CU_TestInfo tests_multipathio[] = {
 	{ (char *)"Simple", test_multipathio_simple },
+	{ (char *)"Reset", test_multipathio_reset },
 	CU_TEST_INFO_NULL
 };
 

test-tool/iscsi-test-cu.h

@@ -301,5 +301,6 @@ void test_writeverify16_dpo(void);
 void test_writeverify16_residuals(void);
 
 void test_multipathio_simple(void);
+void test_multipathio_reset(void);
 
 #endif	/* _ISCSI_TEST_CU_H_ */

test-tool/test_multipathio_reset.c

@@ -0,0 +1,102 @@
+/*
+   Copyright (C) 2013 Ronnie Sahlberg <ronniesahlberg@gmail.com>
+   Copyright (C) 2015 David Disseldorp
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 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 General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <CUnit/CUnit.h>
+
+#include "iscsi.h"
+#include "scsi-lowlevel.h"
+#include "iscsi-support.h"
+#include "iscsi-test-cu.h"
+#include "iscsi-multipath.h"
+
+#define MPATH_MAX_TUR_RETRIES 5
+
+static int
+test_iscsi_tur_until_good(struct scsi_device *iscsi_sd,
+			  int *num_uas)
+{
+	int num_turs;
+
+	*num_uas = 0;
+	for (num_turs = 0; num_turs < MPATH_MAX_TUR_RETRIES; num_turs++) {
+		struct scsi_task *tsk;
+		tsk = iscsi_testunitready_sync(iscsi_sd->iscsi_ctx,
+					       iscsi_sd->iscsi_lun);
+		if (tsk->status == SCSI_STATUS_GOOD) {
+			logging(LOG_VERBOSE, "TUR good after %d retries",
+				num_turs);
+			return 0;
+		} else if ((tsk->status == SCSI_STATUS_CHECK_CONDITION)
+			&& (tsk->sense.key == SCSI_SENSE_UNIT_ATTENTION)) {
+			logging(LOG_VERBOSE, "Got UA for TUR");
+			(*num_uas)++;
+		} else {
+			logging(LOG_NORMAL, "unexpected non-UA failure: %d,%d",
+				tsk->status, tsk->sense.key);
+		}
+	}
+
+	return -ETIMEDOUT;
+}
+
+void
+test_multipathio_reset(void)
+{
+	int reset_path;
+
+	CHECK_FOR_DATALOSS;
+	CHECK_FOR_SBC;
+	MPATH_SKIP_IF_UNAVAILABLE(mp_sds, mp_num_sds);
+	MPATH_SKIP_UNLESS_ISCSI(mp_sds, mp_num_sds);
+
+	logging(LOG_VERBOSE, LOG_BLANK_LINE);
+
+	for (reset_path = 0; reset_path < mp_num_sds; reset_path++) {
+		int num_uas;
+		int ret;
+		int tur_path;
+		struct scsi_device *reset_sd = mp_sds[reset_path];
+
+		logging(LOG_VERBOSE, "Awaiting good TUR");
+		ret = test_iscsi_tur_until_good(reset_sd, &num_uas);
+		CU_ASSERT_EQUAL(ret, 0);
+
+		logging(LOG_VERBOSE,
+			"Test multipath LUN Reset using path %d", reset_path);
+
+		ret = iscsi_task_mgmt_lun_reset_sync(reset_sd->iscsi_ctx,
+						     reset_sd->iscsi_lun);
+		if (ret != 0) {
+			logging(LOG_NORMAL, "LUN reset failed. %s",
+				iscsi_get_error(reset_sd->iscsi_ctx));
+		}
+		CU_ASSERT_EQUAL(ret, 0);
+
+		/* check for and clear LU reset UA on all paths */
+		for (tur_path = 0; tur_path < mp_num_sds; tur_path++) {
+			logging(LOG_VERBOSE, "check for LU reset unit "
+				"attention via TUR on path %d", tur_path);
+			ret = test_iscsi_tur_until_good(mp_sds[tur_path], &num_uas);
+			CU_ASSERT_EQUAL(ret, 0);
+			CU_ASSERT_NOT_EQUAL(num_uas, 0);
+		}
+	}
+}