[PATCH blktests v3 2/3] nvme/rc: Avoid triggering host nvme-cli autoconnect

[Daniel Wagner]

When the host has enabled the udev/systemd autoconnect services for the
fc transport it interacts with blktests and make tests break.

nvme-cli learned to ignore connects attemps when using the --context
command line option paired with a volatile configuration. Thus we can
mark all the resources created by blktests and avoid any interaction
with the systemd autoconnect scripts.

Only enabled this for the fc transport.

Signed-off-by: Daniel Wagner <dwagner at suse.de>
---
 tests/nvme/rc | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/tests/nvme/rc b/tests/nvme/rc
index 1c2c2fab62c1..9b5442b2c07b 100644
--- a/tests/nvme/rc
+++ b/tests/nvme/rc
@@ -176,6 +176,57 @@ _nvme_calc_rand_io_size() {
 	echo "${io_size_kb}k"
 }
 
+_have_nvme_cli_context() {
+	# ignore all non-fc transports for now
+	if [[ "${nvme_trtype}" != "fc" ]] ||
+	   ! nvme connect --help 2>&1 | grep -q -- '--context=<STR>' > /dev/null; then
+		return 1
+	fi
+	return 0
+}
+
+_setup_nvme_cli() {
+	local local_wwnn="${1}"
+	local local_wwpn="${2}"
+	local remote_wwnn="${3}"
+	local remote_wwpn="${4}"
+
+	if ! _have_nvme_cli_context; then
+		return
+	fi
+
+	mkdir -p /run/nvme
+	cat >> /run/nvme/blktests.json <<-EOF
+	[
+	  {
+	    "hostnqn": "${def_hostnqn}",
+	    "hostid": "${def_hostid}",
+	    "subsystems": [
+	      {
+	        "application": "blktests",
+	        "nqn": "blktests-subsystem-1",
+	        "ports": [
+	          {
+	            "transport": "fc",
+	            "traddr": "nn-${remote_wwnn}:pn-${remote_wwpn}",
+	            "host_traddr": "nn-${local_wwnn}:pn-${local_wwpn}"
+	          }
+	        ]
+	      }
+	    ]
+	  }
+	]
+	EOF
+}
+
+_cleanup_nvme_cli() {
+	if ! _have_nvme_cli_context; then
+		return
+	fi
+
+	rm -f /run/nvme/blktests.json
+}
+
 _nvme_fcloop_add_rport() {
 	local local_wwnn="$1"
 	local local_wwpn="$2"
@@ -208,6 +259,9 @@ _setup_fcloop() {
 	local remote_wwnn="${3:-$def_remote_wwnn}"
 	local remote_wwpn="${4:-$def_remote_wwpn}"
 
+	_setup_nvme_cli "${local_wwnn}" "${local_wwpn}" \
+			"${remote_wwnn}" "${remote_wwpn}"
+
 	_nvme_fcloop_add_tport "${remote_wwnn}" "${remote_wwpn}"
 	_nvme_fcloop_add_lport "${local_wwnn}" "${local_wwpn}"
 	_nvme_fcloop_add_rport "${local_wwnn}" "${local_wwpn}" \
@@ -250,6 +304,8 @@ _cleanup_fcloop() {
 	_nvme_fcloop_del_lport "${local_wwnn}" "${local_wwpn}"
 	_nvme_fcloop_del_rport "${local_wwnn}" "${local_wwpn}" \
 			       "${remote_wwnn}" "${remote_wwpn}"
+
+	_cleanup_nvme_cli
 }
 
 _cleanup_nvmet() {
@@ -452,6 +508,9 @@ _nvme_connect_subsys() {
 	subsysnqn="$2"
 
 	ARGS=(-t "${trtype}" -n "${subsysnqn}")
+	if _have_nvme_cli_context; then
+		ARGS+=(--context="blktests")
+	fi
 	if [[ "${trtype}" == "fc" ]] ; then
 		ARGS+=(-a "${traddr}" -w "${host_traddr}")
 	elif [[ "${trtype}" != "loop" ]]; then
@@ -496,6 +555,9 @@ _nvme_discover() {
 	ARGS=(-t "${trtype}")
 	ARGS+=(--hostnqn="${def_hostnqn}")
 	ARGS+=(--hostid="${def_hostid}")
+	if _have_nvme_cli_context; then
+		ARGS+=(--context="blktests")
+	fi
 	if [[ "${trtype}" = "fc" ]]; then
 		ARGS+=(-a "${traddr}" -w "${host_traddr}")
 	elif [[ "${trtype}" != "loop" ]]; then
-- 
2.41.0