virtio_test: support event index

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

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index df0c6d2..74d3331 100644 (file)
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -198,6 +198,14 @@ const struct option longopts[] = {
                .val = 'h',
        },
        {
+               .name = "event-idx",
+               .val = 'E',
+       },
+       {
+               .name = "no-event-idx",
+               .val = 'e',
+       },
+       {
                .name = "indirect",
                .val = 'I',
        },
@@ -211,13 +219,17 @@ const struct option longopts[] = {
 
 static void help()
 {
-       fprintf(stderr, "Usage: virtio_test [--help] [--no-indirect]\n");
+       fprintf(stderr, "Usage: virtio_test [--help]"
+               " [--no-indirect]"
+               " [--no-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_EVENT_IDX);
        int o;
 
        for (;;) {
@@ -228,6 +240,9 @@ int main(int argc, char **argv)
                case '?':
                        help();
                        exit(2);
+               case 'e':
+                       features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
+                       break;
                case 'h':
                        help();
                        goto done;