Add some simple helpers to setup a passthru target that passes through
to a nvme test device.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
---
 tests/nvme/rc | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/tests/nvme/rc b/tests/nvme/rc
index dfa57a299625..1ea23308a3f7 100644
--- a/tests/nvme/rc
+++ b/tests/nvme/rc

@@ -73,6 +73,17 @@ _require_nvme_trtype_is_fabrics() {
 	return 0
 }
 
+_test_dev_nvme_ctrl() {
+	local dev
+
+	dev=$(cat "${TEST_DEV_SYSFS}/device/dev")

+	echo "/dev/char/${dev}"
+}
+
+_test_dev_nvme_nsid() {
+	cat "${TEST_DEV_SYSFS}/nsid"
+}
+
 _cleanup_nvmet() {
 	local dev
 	local port

@@ -257,6 +268,27 @@ _remove_nvmet_subsystem() {
 	rmdir "${subsys_path}"
 }
 
+_create_nvmet_passthru() {
+	local nvmet_subsystem="$1"
+	local subsys_path="${NVMET_CFS}/subsystems/${nvmet_subsystem}"
+	local passthru_path="${subsys_path}/passthru"
+
+	mkdir -p "${subsys_path}"
+	printf 1 > "${subsys_path}/attr_allow_any_host"
+
+	printf "%s" "$(_test_dev_nvme_ctrl)" > "${passthru_path}/device_path"
+	printf 1 > "${passthru_path}/enable"

+}
+
+_remove_nvmet_passhtru() {
+	local nvmet_subsystem="$1"
+	local subsys_path="${NVMET_CFS}/subsystems/${nvmet_subsystem}"
+	local passthru_path="${subsys_path}/passthru"
+
+	printf 0 > "${passthru_path}/enable"
+	rmdir "${subsys_path}"
+}
+
 _add_nvmet_subsys_to_port() {
 	local port="$1"
 	local nvmet_subsystem="$2"

@@ -292,6 +324,50 @@ _find_nvme_dev() {
 	done
 }
 
+_find_nvme_passthru_loop_dev() {
+	local subsys=$1
+	local nsid
+	local dev
+
+	dev=$(_find_nvme_dev "${subsys}")
+	nsid=$(_test_dev_nvme_nsid)
+	echo "/dev/${dev}n${nsid}"
+}
+
+_nvmet_passthru_target_setup() {
+	local subsys_name=$1
+
+	_create_nvmet_passthru "${subsys_name}"
+	port="$(_create_nvmet_port "loop")"
+	_add_nvmet_subsys_to_port "${port}" "${subsys_name}"
+
+	echo "$port"
+}
+
+_nvmet_passthru_target_connect() {
+	local trtype=$1
+	local subsys_name=$2
+
+	_nvme_connect_subsys "${trtype}" "${subsys_name}"
+	nsdev=$(_find_nvme_passthru_loop_dev "${subsys_name}")
+
+	# The following tests can race with the creation
+	# of the device so ensure the block device exists
+	# before continuing
+	while [ ! -b "${nsdev}" ]; do sleep 1; done
+
+	echo "${nsdev}"
+}
+
+_nvmet_passthru_target_cleanup() {
+	local port=$1
+	local subsys_name=$2
+
+	_remove_nvmet_subsystem_from_port "${port}" "${subsys_name}"
+	_remove_nvmet_port "${port}"
+	_remove_nvmet_passhtru "${subsys_name}"
+}
+
 _filter_discovery() {
 	sed -n -r -e "s/Generation counter [0-9]+/Generation counter X/" \
 		  -e '/Discovery Log Number|Log Entry|trtype|subnqn/p'