net/virtio: fix initialization to return negative errno

[ upstream commit 55e19d06f8a8a865297532071453c10544a07a24 ]

virtio_init_device() and called helper functions sometimes return -1
when return code should be negative errno. Fix all such cases to return
correct negative errno instead.

Fixes: 26b683b ("net/virtio: setup Rx queue interrupts")
Fixes: 0c9d662 ("net/virtio: support RSS")
Fixes: 6ba1f63 ("virtio: support specification 1.0")
Fixes: 49d26d9 ("net/virtio: support MTU feature")

Signed-off-by: Boleslav Stankevich <boleslav.stankevich@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>

drivers/net/virtio/virtio_ethdev.c

@@ -1695,15 +1695,17 @@ static int
 virtio_configure_intr(struct rte_eth_dev *dev)
 {
 	struct virtio_hw *hw = dev->data->dev_private;
+	int ret;
 
 	if (!rte_intr_cap_multiple(dev->intr_handle)) {
 		PMD_INIT_LOG(ERR, "Multiple intr vector not supported");
 		return -ENOTSUP;
 	}
 
-	if (rte_intr_efd_enable(dev->intr_handle, dev->data->nb_rx_queues)) {
+	ret = rte_intr_efd_enable(dev->intr_handle, dev->data->nb_rx_queues);
+	if (ret < 0) {
 		PMD_INIT_LOG(ERR, "Fail to create eventfd");
-		return -1;
+		return ret;
 	}
 
 	if (!dev->intr_handle->intr_vec) {
@@ -1735,12 +1737,13 @@ virtio_configure_intr(struct rte_eth_dev *dev)
 	 */
 	if (virtio_intr_enable(dev) < 0) {
 		PMD_DRV_LOG(ERR, "interrupt enable failed");
-		return -1;
+		return -EINVAL;
 	}
 
-	if (virtio_queues_bind_intr(dev) < 0) {
+	ret = virtio_queues_bind_intr(dev);
+	if (ret < 0) {
 		PMD_INIT_LOG(ERR, "Failed to bind queue/interrupt");
-		return -1;
+		return ret;
 	}
 
 	return 0;
@@ -1796,7 +1799,7 @@ virtio_init_device(struct rte_eth_dev *eth_dev, uint64_t req_features)
 	/* Tell the host we've known how to drive the device. */
 	vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
 	if (virtio_negotiate_features(hw, req_features) < 0)
-		return -1;
+		return -EINVAL;
 
 	hw->weak_barriers = !vtpci_with_feature(hw, VIRTIO_F_ORDER_PLATFORM);
 
@@ -1881,7 +1884,7 @@ virtio_init_device(struct rte_eth_dev *eth_dev, uint64_t req_features)
 			if (config->mtu < RTE_ETHER_MIN_MTU) {
 				PMD_INIT_LOG(ERR, "invalid max MTU value (%u)",
 						config->mtu);
-				return -1;
+				return -EINVAL;
 			}
 
 			hw->max_mtu = config->mtu;
@@ -1913,10 +1916,11 @@ virtio_init_device(struct rte_eth_dev *eth_dev, uint64_t req_features)
 		return ret;
 
 	if (eth_dev->data->dev_conf.intr_conf.rxq) {
-		if (virtio_configure_intr(eth_dev) < 0) {
+		ret = virtio_configure_intr(eth_dev);
+		if (ret < 0) {
 			PMD_INIT_LOG(ERR, "failed to configure interrupt");
 			virtio_free_queues(hw);
-			return -1;
+			return ret;
 		}
 	}