[PATCH blktests 05/12] nvme/005: Don't rely on modprobing to set the multipath paramater

[Logan Gunthorpe]

On test systems with existing nvme drives or built-in modules it may not
be possible to remove nvme-core in order to re-probe it with
multipath=1.

Instead, skip the test if the multipath parameter is not already set
ahead of time.

Note: the multipath parameter of nvme-core is set by default if
CONFIG_NVME_MULTIPATH is set so this will only affect systems
that explicitly disable it via the module parameter.

Signed-off-by: Logan Gunthorpe <log...@deltatee.com>
---
 common/rc      | 16 ++++++++++++++++
 tests/nvme/005 | 10 ++--------
 2 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/common/rc b/common/rc
index 5dd2c9512fd2..49050c71dabf 100644
--- a/common/rc
+++ b/common/rc
@@ -55,6 +55,22 @@ _have_module_param() {
        return 0
 }
 
+_have_module_param_value() {
+       local value
+
+       if ! _have_module_param "$1" "$2"; then
+               return 1
+       fi
+
+       value=$(cat "/sys/module/$1/parameters/$2")
+       if [[ "${value}" != "$3" ]]; then
+               SKIP_REASON="$1 module parameter $2 must be set to $3"
+               return 1
+       fi
+
+       return 0
+}
+
 _have_program() {
        if command -v "$1" >/dev/null 2>&1; then
                return 0
diff --git a/tests/nvme/005 b/tests/nvme/005
index e72fc809c936..91c164de73e6 100755
--- a/tests/nvme/005
+++ b/tests/nvme/005
@@ -12,18 +12,13 @@ QUICK=1
 
 requires() {
        _have_modules loop nvme-core nvme-loop nvmet && \
-               _have_module_param nvme-core multipath && _have_configfs
+               _have_module_param_value nvme_core multipath Y && \
+               _have_configfs
 }
 
 test() {
        echo "Running ${TEST_NAME}"
 
-       # Clean up all stale modules
-       modprobe -r nvme-loop
-       modprobe -r nvme-core
-       modprobe -r nvmet
-
-       modprobe nvme-core multipath=1
        modprobe nvmet
        modprobe nvme-loop
 
@@ -57,7 +52,6 @@ test() {
        rm "$TMPDIR/img"
 
        modprobe -r nvme-loop
-       modprobe -r nvme-core
        modprobe -r nvmet
 
        echo "Test complete"
-- 
2.17.1