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

["Xia, Chenbo" <chenbo.xia@intel.com>]

> -----Original Message-----
> From: Boleslav Stankevich <boleslav.stankevich@oktetlabs.ru>
> Sent: Wednesday, March 22, 2023 6:23 PM
> To: dev@dpdk.org
> Cc: Boleslav Stankevich <boleslav.stankevich@oktetlabs.ru>;
> stable@dpdk.org; Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>; Maxime
> Coquelin <maxime.coquelin@redhat.com>; Xia, Chenbo <chenbo.xia@intel.com>;
> Jianfeng Tan <jianfeng.tan@intel.com>; Yuanhan Liu <yliu@fridaylinux.org>;
> Tetsuya Mukawa <mtetsuyah@gmail.com>; Huawei Xie <huawei.xhw@alibaba-
> inc.com>
> Subject: [PATCH 2/2] net/virtio: fix device init to return negative errno
> 
> 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@dpdk.org
> 
> Signed-off-by: Boleslav Stankevich <boleslav.stankevich@oktetlabs.ru>
> Signed-off-by: Andrew Rybchenko <andrew.rybchenko@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

Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>