[RFC] test/eal_flags: suppress vdev_netvsc auto-probe

[Stephen Hemminger <stephen@networkplumber.org>]

On Hyper-V systems (including Azure-hosted CI), the vdev_netvsc
driver auto-injects itself during vdev bus scan. This interferes
with the vdev flag test causing the nodeaction subprocess to fail.

Suppress by passing net_vdev_netvsc,ignore=1 in the valid vdev
test cases. The scan callback sees it already in devargs and
skips injection; the probe honours ignore and does nothing.

Fixes: 0d684a783088 ("app/test: fix and separate --vdev unit test")
Cc: stable@dpdk.org

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 app/test/test_eal_flags.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/app/test/test_eal_flags.c b/app/test/test_eal_flags.c
index bebddf1c98..1c0d8e040a 100644
--- a/app/test/test_eal_flags.c
+++ b/app/test/test_eal_flags.c
@@ -426,13 +426,16 @@ test_invalid_vdev_flag(void)
 
 	/* Test with valid vdev option */
 	const char *vdevval1[] = {prgname, prefix, no_huge, eal_debug_logs,
-				bus_debug_logs,	vdev, "net_ring0"};
+				bus_debug_logs,	vdev, "net_ring0",
+				vdev, "net_vdev_netvsc,ignore=1"};
 
 	const char *vdevval2[] = {prgname, prefix, no_huge, eal_debug_logs,
-				bus_debug_logs, vdev, "net_ring0,args=test"};
+				bus_debug_logs, vdev, "net_ring0,args=test",
+				vdev, "net_vdev_netvsc,ignore=1"};
 
 	const char *vdevval3[] = {prgname, prefix, no_huge, eal_debug_logs,
-				bus_debug_logs, vdev, "net_ring0,nodeaction=r1:0:CREATE"};
+				bus_debug_logs, vdev, "net_ring0,nodeaction=r1:0:CREATE",
+				vdev, "net_vdev_netvsc,ignore=1"};
 
 	if (launch_proc(vdevinval) == 0) {
 		printf("Error (line %d) - process did run ok with invalid vdev parameter\n",
-- 
2.51.0