[PATCH 12/18] virtio_test: support used_event index

["Michael S. Tsirkin" <mst@redhat.com>]

Add ability to test the new used_event feature,
enable by default.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 tools/virtio/virtio_test.c |   18 ++++++++++++++++--
 1 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index 9e65e6d..157ec68 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -210,18 +210,29 @@ const struct option longopts[] = {
 		.val = 'i',
 	},
 	{
+		.name = "used-event-idx",
+		.val = 'U',
+	},
+	{
+		.name = "no-used-event-idx",
+		.val = 'u',
+	},
+	{
 	}
 };
 
 static void help()
 {
-	fprintf(stderr, "Usage: virtio_test [--help] [--no-indirect]\n");
+	fprintf(stderr, "Usage: virtio_test [--help]"
+		" [--no-indirect] "
+		" [--no-used-event-idx]\n");
 }
 
 int main(int argc, char **argv)
 {
 	struct vdev_info dev;
-	unsigned long long features = 1ULL << VIRTIO_RING_F_INDIRECT_DESC;
+	unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
+		(1ULL << VIRTIO_RING_F_USED_EVENT_IDX);
 	int o;
 
 	for (;;) {
@@ -238,6 +249,9 @@ int main(int argc, char **argv)
 		case 'i':
 			features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
 			break;
+		case 'u':
+			features &= ~(1ULL << VIRTIO_RING_F_USED_EVENT_IDX);
+			break;
 		default:
 			assert(0);
 			break;
-- 
1.7.5.53.gc233e