[dpdk-dev] [PATCH v1 3/9] net/mlx5: fix device arguments error detection

[Matan Azrad <matan@mellanox.com>]

When bad device arguments are added to the DPDK command line, the PMD
ignores all the command line arguments specified by the user and uses
the default values instead.

This behavior doesn't make sense because the user intension is to force
some device parameters and expects to get an error in case of
problematic issues with the arguments.

Stop probing and report an error in case of problematic command line
arguments.

Fixes: e72dd09b614e ("net/mlx5: add support for configuration through kvargs")
Cc: stable@dpdk.org

Signed-off-by: Matan Azrad <matan@mellanox.com>
---
 drivers/net/mlx5/mlx5.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index ebb49c8..23e397e 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -986,8 +986,10 @@ struct mlx5_dev_spawn_data {
 		return 0;
 	/* Following UGLY cast is done to pass checkpatch. */
 	kvlist = rte_kvargs_parse(devargs->args, params);
-	if (kvlist == NULL)
-		return 0;
+	if (kvlist == NULL) {
+		rte_errno = EINVAL;
+		return -rte_errno;
+	}
 	/* Process parameters. */
 	for (i = 0; (params[i] != NULL); ++i) {
 		if (rte_kvargs_count(kvlist, params[i])) {
-- 
1.8.3.1