[PATCH v3 7/8] tools/virtio: Reset index in virtio_test --reset.

From: Eugenio PÃrez
Date: Sat Apr 18 2020 - 06:24:13 EST


This way behavior for vhost is more like a VM.

Signed-off-by: Eugenio PÃrez <eperezma@xxxxxxxxxx>
---
tools/virtio/virtio_test.c | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index bc16c818bda3..82902fc3ba2a 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -48,6 +48,7 @@ struct vdev_info {

static const struct vhost_vring_file no_backend = { .fd = -1 },
backend = { .fd = 1 };
+static const struct vhost_vring_state null_state = {};

bool vq_notify(struct virtqueue *vq)
{
@@ -173,14 +174,19 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
unsigned len;
long long spurious = 0;
const bool random_batch = batch == RANDOM_BATCH;
+
r = ioctl(dev->control, VHOST_TEST_RUN, &test);
assert(r >= 0);
+ if (!reset_n) {
+ next_reset = INT_MAX;
+ }
+
for (;;) {
virtqueue_disable_cb(vq->vq);
completed_before = completed;
started_before = started;
do {
- const bool reset = reset_n && completed > next_reset;
+ const bool reset = completed > next_reset;
if (random_batch)
batch = (random() % vq->vring.num) + 1;

@@ -223,10 +229,24 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
}

if (reset) {
+ struct vhost_vring_state s = { .index = 0 };
+
+ vq_reset(vq, vq->vring.num, &dev->vdev);
+
+ r = ioctl(dev->control, VHOST_GET_VRING_BASE,
+ &s);
+ assert(!r);
+
+ s.num = 0;
+ r = ioctl(dev->control, VHOST_SET_VRING_BASE,
+ &null_state);
+ assert(!r);
+
r = ioctl(dev->control, VHOST_TEST_SET_BACKEND,
&backend);
assert(!r);

+ started = completed;
while (completed > next_reset)
next_reset += completed;
}
@@ -248,7 +268,9 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
test = 0;
r = ioctl(dev->control, VHOST_TEST_RUN, &test);
assert(r >= 0);
- fprintf(stderr, "spurious wakeups: 0x%llx\n", spurious);
+ fprintf(stderr,
+ "spurious wakeups: 0x%llx started=0x%lx completed=0x%lx\n",
+ spurious, started, completed);
}

const char optstring[] = "h";
--
2.18.1