[PATCH blktests v5 4/4] nvme/048: test queue count changes on reconnect

[Daniel Wagner <dwagner@suse.de>]

The target is allowed to change the number of I/O queues. Test if the
host is able to reconnect in this scenario.

Signed-off-by: Daniel Wagner <dwagner@suse.de>
---
 tests/nvme/048     | 81 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/nvme/048.out |  3 ++
 2 files changed, 84 insertions(+)
 create mode 100755 tests/nvme/048
 create mode 100644 tests/nvme/048.out

diff --git a/tests/nvme/048 b/tests/nvme/048
new file mode 100755
index 000000000000..bc4766e82159
--- /dev/null
+++ b/tests/nvme/048
@@ -0,0 +1,81 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2023 Daniel Wagner, SUSE Labs
+#
+# Test queue count changes on reconnect
+
+. tests/nvme/rc
+
+DESCRIPTION="Test queue count changes on reconnect"
+QUICK=1
+
+requires() {
+	_nvme_requires
+	_have_loop
+	_require_nvme_trtype tcp rdma fc
+	_require_min_cpus 2
+}
+
+set_max_qid() {
+	local port="$1"
+	local subsys_name="$2"
+	local max_qid="$3"
+
+	_set_nvmet_attr_qid_max "${subsys_name}" "${max_qid}"
+
+	# Setting qid_max forces a disconnect and the reconntect attempt starts
+	# 10s after connection lost, thus we will see the connecting state.
+	_nvmf_wait_for_state "${subsys_name}" "connecting"
+	_nvmf_wait_for_state "${subsys_name}" "live"
+}
+
+test() {
+	local port
+	local subsys_name="blktests-subsystem-1"
+	local hostid
+	local hostnqn="nqn.2014-08.org.nvmexpress:uuid:${hostid}"
+	local file_path="${TMPDIR}/img"
+
+	echo "Running ${TEST_NAME}"
+
+	hostid="$(uuidgen)"
+	if [ -z "$hostid" ] ; then
+		echo "uuidgen failed"
+		return 1
+	fi
+
+	if ! _detect_nvmet_subsys_attr "attr_qid_max"; then
+		SKIP_REASONS+=("missing attr_qid_max feature")
+		return 1
+	fi
+
+	truncate -s 512M "${file_path}"
+
+	_create_nvmet_subsystem "${subsys_name}" "${file_path}" \
+		"b92842df-a394-44b1-84a4-92ae7d112861"
+	port="$(_create_nvmet_port "${nvme_trtype}")"
+	_add_nvmet_subsys_to_port "${port}" "${subsys_name}"
+	_create_nvmet_host "${subsys_name}" "${hostnqn}"
+
+	_nvme_connect_subsys "${nvme_trtype}" "${subsys_name}" \
+			     --hostnqn "${hostnqn}" \
+			     --hostid "${hostid}"
+
+	_nvmf_wait_for_state "${subsys_name}" "live"
+
+	set_max_qid "${port}" "${subsys_name}" 1
+	set_max_qid "${port}" "${subsys_name}" 128
+
+	_nvme_disconnect_subsys "${subsys_name}"
+
+	_remove_nvmet_subsystem_from_port "${port}" "${subsys_name}"
+	_remove_nvmet_subsystem "${subsys_name}"
+
+	_remove_nvmet_port "${port}"
+
+	_remove_nvmet_host "${hostnqn}"
+
+	rm "${file_path}"
+
+	echo "Test complete"
+}
diff --git a/tests/nvme/048.out b/tests/nvme/048.out
new file mode 100644
index 000000000000..7f986ef9637d
--- /dev/null
+++ b/tests/nvme/048.out
@@ -0,0 +1,3 @@
+Running nvme/048
+NQN:blktests-subsystem-1 disconnected 1 controller(s)
+Test complete
-- 
2.40.0