The virtio ring is the basis of virtio communication. Test its basic functionality and its resilience against corruption from the device.
Signed-off-by: Andrew Scull ascull@google.com --- test/dm/virtio.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+)
diff --git a/test/dm/virtio.c b/test/dm/virtio.c index 9a7e658cce..4cf0f56260 100644 --- a/test/dm/virtio.c +++ b/test/dm/virtio.c @@ -130,3 +130,75 @@ static int dm_test_virtio_remove(struct unit_test_state *uts) return 0; } DM_TEST(dm_test_virtio_remove, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT); + +/* Test all of the virtio ring */ +static int dm_test_virtio_ring(struct unit_test_state *uts) +{ + struct udevice *bus, *dev; + struct virtio_dev_priv *uc_priv; + struct virtqueue *vq; + struct virtio_sg sg[2]; + struct virtio_sg *sgs[2]; + unsigned int len; + u8 buffer[2][32]; + + /* check probe success */ + ut_assertok(uclass_first_device(UCLASS_VIRTIO, &bus)); + ut_assertnonnull(bus); + + /* check the child virtio-rng device is bound */ + ut_assertok(device_find_first_child(bus, &dev)); + ut_assertnonnull(dev); + + /* + * fake the virtio device probe by filling in uc_priv->vdev + * which is used by virtio_find_vqs/virtio_del_vqs. + */ + uc_priv = dev_get_uclass_priv(bus); + ut_assertnonnull(uc_priv); + uc_priv->vdev = dev; + + /* prepare the scatter-gather buffer */ + sg[0].addr = buffer[0]; + sg[0].length = sizeof(buffer[0]); + sg[1].addr = buffer[1]; + sg[1].length = sizeof(buffer[1]); + sgs[0] = &sg[0]; + sgs[1] = &sg[1]; + + /* read a buffer and report written size from device */ + ut_assertok(virtio_find_vqs(dev, 1, &vq)); + ut_assertok(virtqueue_add(vq, sgs, 0, 1)); + vq->vring.used->idx = 1; + vq->vring.used->ring[0].id = 0; + vq->vring.used->ring[0].len = 0x53355885; + ut_asserteq_ptr(buffer, virtqueue_get_buf(vq, &len)); + ut_asserteq(0x53355885, len); + ut_assertok(virtio_del_vqs(dev)); + + /* rejects used descriptors that aren't a chain head */ + ut_assertok(virtio_find_vqs(dev, 1, &vq)); + ut_assertok(virtqueue_add(vq, sgs, 0, 2)); + vq->vring.used->idx = 1; + vq->vring.used->ring[0].id = 1; + vq->vring.used->ring[0].len = 0x53355885; + ut_assertnull(virtqueue_get_buf(vq, &len)); + ut_assertok(virtio_del_vqs(dev)); + + /* device changes to descriptor are ignored */ + ut_assertok(virtio_find_vqs(dev, 1, &vq)); + ut_assertok(virtqueue_add(vq, sgs, 0, 1)); + vq->vring.desc[0].addr = cpu_to_virtio64(dev, 0xbadbad11); + vq->vring.desc[0].len = cpu_to_virtio32(dev, 0x11badbad); + vq->vring.desc[0].flags = cpu_to_virtio16(dev, VRING_DESC_F_NEXT); + vq->vring.desc[0].next = cpu_to_virtio16(dev, U16_MAX); + vq->vring.used->idx = 1; + vq->vring.used->ring[0].id = 0; + vq->vring.used->ring[0].len = 6; + ut_asserteq_ptr(buffer, virtqueue_get_buf(vq, &len)); + ut_asserteq(6, len); + ut_assertok(virtio_del_vqs(dev)); + + return 0; +} +DM_TEST(dm_test_virtio_ring, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);