[PATCH blktests 05/11] nvme/rc: introduce NVMET_TR_TYPES

[Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>]

Some of the test cases in nvme test group can be run under various nvme
target transport types. The configuration parameter nvme_trtype
specifies the transport to use. But this configuration method has two
drawbacks. Firstly, the blktests check script needs to be invoked
multiple times to cover multiple transport types. Secondly, the test
cases irrelevant to the transport types are executed exactly same
conditions in the multiple blktests runs.

To avoid the drawbacks, introduce new configuration parameter
NVMET_TR_TYPES. This is an array, and multiple transport types can
be set like:

    NVMET_TR_TYPES=(loop tcp)

Also introduce _nvmet_set_nvme_trtype() which can be called from the
set_conditions() hook of the transport type dependent test cases.
Blktests will repeat the test case as many as the number of elements in
NVMET_TR_TYPES, and set nvme_trtype for each test case run.

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
---
 Documentation/running-tests.md |  6 +++++-
 tests/nvme/rc                  | 30 +++++++++++++++++++++++++++++-
 2 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/Documentation/running-tests.md b/Documentation/running-tests.md
index ae80860..ede3a81 100644
--- a/Documentation/running-tests.md
+++ b/Documentation/running-tests.md
@@ -102,8 +102,12 @@ RUN_ZONED_TESTS=1
 
 The NVMe tests can be additionally parameterized via environment variables.
 
+- NVMET_TR_TYPES (array)
+  Set up NVME target backends with the specified transport.
+  Valid elements are 'loop', 'tcp', 'rdma' and 'fc'. Default value is '(loop)'.
 - nvme_trtype: 'loop' (default), 'tcp', 'rdma' and 'fc'
-  Run the tests with the given transport.
+  Run the tests with the given transport. This parameter is still usable but
+  replaced with NVMET_TR_TYPES. Use NVMET_TR_TYPES instead.
 - nvme_img_size: '1G' (default)
   Run the tests with given image size in bytes. 'm', 'M', 'g'
 	and 'G' postfix are supported.
diff --git a/tests/nvme/rc b/tests/nvme/rc
index 1f5ff44..df6bf77 100644
--- a/tests/nvme/rc
+++ b/tests/nvme/rc
@@ -18,10 +18,38 @@ def_hostid="0f01fb42-9f7f-4856-b0b3-51e60b8de349"
 def_hostnqn="nqn.2014-08.org.nvmexpress:uuid:${def_hostid}"
 export def_subsysnqn="blktests-subsystem-1"
 export def_subsys_uuid="91fdba0d-f87b-4c25-b80f-db7be1418b9e"
-nvme_trtype=${nvme_trtype:-"loop"}
 nvme_img_size=${nvme_img_size:-"1G"}
 nvme_num_iter=${nvme_num_iter:-"1000"}
 
+# Check consistency of NVMET_TR_TYPES and nvme_trtype configurations.
+# If neither is configured, set the default value.
+first_call=${first_call:-1}
+if ((first_call)); then
+	if [[ -n $nvme_trtype ]]; then
+		if [[ -n $NVMET_TR_TYPES ]]; then
+			echo "Both nvme_trtype and NVMET_TR_TYPES are specified"
+			exit 1
+		fi
+		NVMET_TR_TYPES=("$nvme_trtype")
+	elif [[ -z ${NVMET_TR_TYPES[*]} ]]; then
+		nvme_trtype="loop"
+		NVMET_TR_TYPES=("$nvme_trtype")
+	fi
+	first_call=0
+fi
+
+_set_nvme_trtype() {
+	local index=$1
+
+	if [[ -z $index ]]; then
+		echo ${#NVMET_TR_TYPES[@]}
+		return
+	fi
+
+	nvme_trtype=${NVMET_TR_TYPES[index]}
+	COND_DESC="nvmet tr=${nvme_trtype}"
+}
+
 # TMPDIR can not be referred out of test() or test_device() context. Instead of
 # global variable def_flie_path, use this getter function.
 _nvme_def_file_path() {
-- 
2.44.0