This will be used as a 'probe' mode in the selftest to check whether
the device supports the devmem or not. Use hard-coded queue layout
(two last queues) and prevent user from passing custom -q and/or -t.

Cc: Mina Almasry <redacted>
Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
---
 tools/testing/selftests/net/ncdevmem.c | 42 ++++++++++++++++++++------
 1 file changed, 32 insertions(+), 10 deletions(-)

diff --git a/tools/testing/selftests/net/ncdevmem.c b/tools/testing/selftests/net/ncdevmem.c
index 90aacfb3433f..3a456c058241 100644
--- a/tools/testing/selftests/net/ncdevmem.c
+++ b/tools/testing/selftests/net/ncdevmem.c

@@ -64,7 +64,7 @@ static char *client_ip;
 static char *port;
 static size_t do_validation;
 static int start_queue = -1;
-static int num_queues = 1;
+static int num_queues = -1;
 static char *ifname;
 static unsigned int ifindex;
 static unsigned int dmabuf_id;

@@ -706,19 +706,31 @@ int main(int argc, char *argv[])
 		}
 	}
 
-	if (!server_ip)
-		error(1, 0, "Missing -s argument\n");
-
-	if (!port)
-		error(1, 0, "Missing -p argument\n");
-
 	if (!ifname)
 		error(1, 0, "Missing -f argument\n");
 
 	ifindex = if_nametoindex(ifname);
 
-	if (start_queue < 0) {
-		start_queue = rxq_num(ifindex) - 1;
+	if (!server_ip && !client_ip) {
+		if (start_queue < 0 && num_queues < 0) {
+			num_queues = rxq_num(ifindex);
+			if (num_queues < 0)
+				error(1, 0, "couldn't detect number of queues\n");
+			/* make sure can bind to multiple queues */