[PATCH v2] kvargs: fix device iterator match from arguments

[Xueming Li <xuemingl@nvidia.com>]

Device iterator RTE_DEV_FOREACH() failed to return devices from
classifier like "class=vdpa", because matching name from empty kvargs
returns no result. If device name not specified in kvargs, the function
should iterate all devices.

This patch allows empty devargs or devargs without name specified.

Fixes: 6aebb942907d ("kvargs: add function to get from key and value")
Cc: olivier.matz@6wind.com

Signed-off-by: Xueming Li <xuemingl@nvidia.com>
---
21.11 specific bug, no copy to stable.org
---
 drivers/bus/auxiliary/auxiliary_params.c | 14 +++++++++-----
 drivers/bus/vdev/vdev_params.c           | 14 +++++++++-----
 2 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/bus/auxiliary/auxiliary_params.c b/drivers/bus/auxiliary/auxiliary_params.c
index a9c7853ed1d..9cbc1f7c777 100644
--- a/drivers/bus/auxiliary/auxiliary_params.c
+++ b/drivers/bus/auxiliary/auxiliary_params.c
@@ -26,11 +26,15 @@ auxiliary_dev_match(const struct rte_device *dev,
 {
 	const struct rte_kvargs *kvlist = _kvlist;
 	const char *key = auxiliary_params_keys[RTE_AUXILIARY_PARAM_NAME];
-
-	if (rte_kvargs_get_with_value(kvlist, key, dev->name) == NULL)
-		return -1;
-
-	return 0;
+	const char *name;
+
+	if (kvlist == NULL)
+		return 0;
+	name = rte_kvargs_get(kvlist, key);
+	if (name == NULL)
+		/* Iterate all devices if name not specified. */
+		return 0;
+	return strcmp(name, dev->name);
 }
 
 void *
diff --git a/drivers/bus/vdev/vdev_params.c b/drivers/bus/vdev/vdev_params.c
index 37d95395e7a..b4baecb7c0d 100644
--- a/drivers/bus/vdev/vdev_params.c
+++ b/drivers/bus/vdev/vdev_params.c
@@ -28,11 +28,15 @@ vdev_dev_match(const struct rte_device *dev,
 {
 	const struct rte_kvargs *kvlist = _kvlist;
 	const char *key = vdev_params_keys[RTE_VDEV_PARAM_NAME];
-
-	if (rte_kvargs_get_with_value(kvlist, key, dev->name) == NULL)
-		return -1;
-
-	return 0;
+	const char *name;
+
+	if (kvlist == NULL)
+		return 0;
+	name = rte_kvargs_get(kvlist, key);
+	if (name == NULL)
+		/* Iterate all devices if name not specified. */
+		return 0;
+	return strcmp(name, dev->name);
 }
 
 void *
-- 
2.34.0