net/virtio: reject unsupported Tx multi-queue modes

[ upstream commit 9fc963a ]

This driver supports none of DCB or VMDQ modes, therefore must
check and return error if configured incorrectly.

Fixes: c1f8630 ("virtio: add new driver")

Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

drivers/net/virtio/virtio_ethdev.c

@@ -1873,6 +1873,13 @@ virtio_dev_configure(struct rte_eth_dev *dev)
 		return -EINVAL;
 	}
 
+	if (txmode->mq_mode != ETH_MQ_TX_NONE) {
+		PMD_DRV_LOG(ERR,
+			"Unsupported Tx multi queue mode %d",
+			txmode->mq_mode);
+		return -EINVAL;
+	}
+
 	if (dev->data->dev_conf.intr_conf.rxq) {
 		ret = virtio_init_device(dev, hw->req_guest_features);
 		if (ret < 0)