From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH v3 36/40] rte_ethdev.h: explicit cast for
 return type
Date: Thu, 10 May 2018 12:18:41 -0700
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To: Andy Green <andy@warmcat.com>
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On Thu, 10 May 2018 10:49:20 +0800
Andy Green <andy@warmcat.com> wrote:

> /projects/lagopus/src/dpdk/build/include/rte_ethdev.h:3860:10:
> warning: conversion to 'int' from 'uint32_t' {aka 'unsigned int'}
> may change the sign of the result [-Wsign-conversion]
>   return (*dev->dev_ops->rx_queue_count)(dev, queue_id);
> 
> Signed-off-by: Andy Green <andy@warmcat.com>
> ---
>  lib/librte_ethdev/rte_ethdev.h |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
> index 2487e1d2d..c84dc44b8 100644
> --- a/lib/librte_ethdev/rte_ethdev.h
> +++ b/lib/librte_ethdev/rte_ethdev.h
> @@ -3857,7 +3857,7 @@ rte_eth_rx_queue_count(uint16_t port_id, uint16_t queue_id)
>  	if (queue_id >= dev->data->nb_rx_queues)
>  		return -EINVAL;
>  
> -	return (*dev->dev_ops->rx_queue_count)(dev, queue_id);
> +	return (int)(*dev->dev_ops->rx_queue_count)(dev, queue_id);
>  }
>  
>  /**
> 

Why not change rx_queue_count to int to allow drivers to return an error?