linux-kernel - [PATCH blktests v2 2/3] nvme/rc: Avoid triggering host nvme-cli autoconnect

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Message-ID: <20230628151623.11340-3-dwagner@suse.de>
Date:   Wed, 28 Jun 2023 17:16:22 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     linux-nvme@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        Chaitanya Kulkarni <kch@...dia.com>,
        Shin'ichiro Kawasaki <shinichiro@...tmail.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Hannes Reinecke <hare@...e.de>,
        James Smart <jsmart2021@...il.com>,
        Daniel Wagner <dwagner@...e.de>
Subject: [PATCH blktests v2 2/3] nvme/rc: Avoid triggering host nvme-cli autoconnect

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@...e.de>
---
 tests/nvme/rc | 81 ++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 71 insertions(+), 10 deletions(-)

diff --git a/tests/nvme/rc b/tests/nvme/rc
index 191f3e2e0c43..06d98f46b471 100644
--- a/tests/nvme/rc
+++ b/tests/nvme/rc
@@ -14,8 +14,8 @@ def_remote_wwnn="0x10001100aa000001"
 def_remote_wwpn="0x20001100aa000001"
 def_local_wwnn="0x10001100aa000002"
 def_local_wwpn="0x20001100aa000002"
-def_hostnqn="$(cat /etc/nvme/hostnqn 2> /dev/null)"
-def_hostid="$(cat /etc/nvme/hostid 2> /dev/null)"
+def_hostnqn="nqn.2014-08.org.nvmexpress:uuid:242d4a24-2484-4a80-8234-d0169409c5e8"
+def_hostid="242d4a24-2484-4a80-8234-d0169409c5e8"
 nvme_trtype=${nvme_trtype:-"loop"}
 nvme_img_size=${nvme_img_size:-"1G"}
 nvme_num_iter=${nvme_num_iter:-"1000"}
@@ -161,6 +161,57 @@ _nvme_calc_rand_io_size() {
 	echo "${io_size_kb}k"
 }
 
+_have_nvme_cli_context() {
+	# ignore all non-fc transports
+	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="$2"
@@ -193,6 +244,9 @@ _setup_fcloop() {
 	local remote_wwnn="${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}" \
@@ -235,6 +289,8 @@ _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() {
@@ -436,18 +492,18 @@ _nvme_connect_subsys() {
 	trtype="$1"
 	subsysnqn="$2"
 
-	ARGS=(-t "${trtype}" -n "${subsysnqn}")
+	ARGS=(-t "${trtype}"
+	      -n "${subsysnqn}"
+	      --hostnqn="${hostnqn}"
+	      --hostid="${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
 		ARGS+=(-a "${traddr}" -s "${trsvcid}")
 	fi
-	if [[ "${hostnqn}" != "$def_hostnqn" ]]; then
-		ARGS+=(--hostnqn="${hostnqn}")
-	fi
-	if [[ "${hostid}" != "$def_hostid" ]]; then
-		ARGS+=(--hostid="${hostid}")
-	fi
 	if [[ -n "${hostkey}" ]]; then
 		ARGS+=(--dhchap-secret="${hostkey}")
 	fi
@@ -482,7 +538,12 @@ _nvme_discover() {
 	local host_traddr="${3:-$def_host_traddr}"
 	local trsvcid="${3:-$def_trsvcid}"
 
-	ARGS=(-t "${trtype}")
+	ARGS=(-t "${trtype}"
+	      --hostnqn="${def_hostnqn}"
+	      --hostid="${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