Re: [dpdk-dev] [PATCH 12/13] i40e: return -errno when intr setup fails

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 12/13/2016 1:08 AM, Michał Mirosław wrote:
> Signed-off-by: Michał Mirosław <michal.miroslaw@atendesoftware.pl>
> ---
>  drivers/net/i40e/i40e_ethdev.c               | 5 +++--
>  lib/librte_eal/linuxapp/eal/eal_interrupts.c | 2 +-
>  2 files changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
> index 67778ba..39fbcfe 100644
> --- a/drivers/net/i40e/i40e_ethdev.c
> +++ b/drivers/net/i40e/i40e_ethdev.c
> @@ -1692,8 +1692,9 @@ i40e_dev_start(struct rte_eth_dev *dev)
>  	     !RTE_ETH_DEV_SRIOV(dev).active) &&
>  	    dev->data->dev_conf.intr_conf.rxq != 0) {
>  		intr_vector = dev->data->nb_rx_queues;
> -		if (rte_intr_efd_enable(intr_handle, intr_vector))
> -			return -1;
> +		ret = rte_intr_efd_enable(intr_handle, intr_vector);
> +		if (ret)
> +			return ret;

What is the benefit of returning -errno instead of -1?

>  	}
>  
>  	if (rte_intr_dp_is_en(intr_handle) && !intr_handle->intr_vec) {
> diff --git a/lib/librte_eal/linuxapp/eal/eal_interrupts.c b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
> index 47a3b20..f7a8ce3 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_interrupts.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
> @@ -1157,7 +1157,7 @@ rte_intr_efd_enable(struct rte_intr_handle *intr_handle, uint32_t nb_efd)
>  				RTE_LOG(ERR, EAL,
>  					"can't setup eventfd, error %i (%s)\n",
>  					errno, strerror(errno));
> -				return -1;
> +				return -errno;
>  			}
>  			intr_handle->efds[i] = fd;
>  		}
>