[PATCH 2/2] net/virtio: fix device init to return negative errno

[Boleslav Stankevich]

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: 26b683b4f7d0 ("net/virtio: setup Rx queue interrupts")
Fixes: 0c9d66207054 ("net/virtio: support RSS")
Fixes: 6ba1f63b5ab0 ("virtio: support specification 1.0")
Fixes: 49d26d9e3f47 ("net/virtio: support MTU feature")
Cc: stable at dpdk.org

Signed-off-by: Boleslav Stankevich <boleslav.stankevich at oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <andrew.rybchenko at oktetlabs.ru>
---
 drivers/net/virtio/virtio_ethdev.c | 33 +++++++++++++++++-------------
 1 file changed, 19 insertions(+), 14 deletions(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 5c8b7b95e9..ca4ade9ff2 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1397,9 +1397,10 @@ virtio_configure_intr(struct rte_eth_dev *dev)
 		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;
 	}
 
 	ret = rte_intr_vec_list_alloc(dev->intr_handle, "intr_vec",
@@ -1428,12 +1429,13 @@ 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;
@@ -1756,7 +1758,7 @@ virtio_dev_rss_init(struct rte_eth_dev *eth_dev)
 				eth_dev->device->numa_node);
 		if (!hw->rss_key) {
 			PMD_INIT_LOG(ERR, "Failed to allocate RSS key");
-			return -1;
+			return -ENOMEM;
 		}
 	}
 
@@ -1778,7 +1780,7 @@ virtio_dev_rss_init(struct rte_eth_dev *eth_dev)
 				eth_dev->device->numa_node);
 		if (!hw->rss_reta) {
 			PMD_INIT_LOG(ERR, "Failed to allocate RSS reta");
-			return -1;
+			return -ENOMEM;
 		}
 
 		hw->rss_rx_queues = 0;
@@ -1818,7 +1820,7 @@ virtio_init_device(struct rte_eth_dev *eth_dev, uint64_t req_features)
 	/* Tell the host we've known how to drive the device. */
 	virtio_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
 	if (virtio_ethdev_negotiate_features(hw, req_features) < 0)
-		return -1;
+		return -EINVAL;
 
 	hw->weak_barriers = !virtio_with_feature(hw, VIRTIO_F_ORDER_PLATFORM);
 
@@ -1900,7 +1902,7 @@ 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;
@@ -1913,9 +1915,11 @@ virtio_init_device(struct rte_eth_dev *eth_dev, uint64_t req_features)
 		}
 
 		hw->rss_hash_types = 0;
-		if (virtio_with_feature(hw, VIRTIO_NET_F_RSS))
-			if (virtio_dev_rss_init(eth_dev))
-				return -1;
+		if (virtio_with_feature(hw, VIRTIO_NET_F_RSS)) {
+			ret = virtio_dev_rss_init(eth_dev);
+			if (ret < 0)
+				return ret;
+		}
 
 		PMD_INIT_LOG(DEBUG, "config->max_virtqueue_pairs=%d",
 				config->max_virtqueue_pairs);
@@ -1937,10 +1941,11 @@ 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;
 		}
 	}
 
-- 
2.30.2