Re: [PATCH v2] ethdev: optimize how the values of the flag variables are assigned

[Stephen Hemminger <stephen@networkplumber.org>]

On Wed, 21 May 2025 18:15:31 +0800
Sunyang Wu <sunyang.wu@jaguarmicro.com> wrote:

> Set the values of the promiscuous and all_multicast variables
> according to the return value.
> 
> Signed-off-by: Morten Brørup <mb@smartsharesystems.com>
> Signed-off-by: Sunyang Wu <sunyang.wu@jaguarmicro.com>
> ---
>  lib/ethdev/rte_ethdev.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
> index d4197322a0..c27d3e5041 100644
> --- a/lib/ethdev/rte_ethdev.c
> +++ b/lib/ethdev/rte_ethdev.c
> @@ -3044,10 +3044,9 @@ rte_eth_promiscuous_disable(uint16_t port_id)
>  	if (dev->dev_ops->promiscuous_disable == NULL)
>  		return -ENOTSUP;
>  
> -	dev->data->promiscuous = 0;
>  	diag = dev->dev_ops->promiscuous_disable(dev);
> -	if (diag != 0)
> -		dev->data->promiscuous = 1;
> +	if (!diag)
> +		dev->data->promiscuous = 0;
>  
>  	diag = eth_err(port_id, diag);
>  
> @@ -3112,10 +3111,10 @@ rte_eth_allmulticast_disable(uint16_t port_id)
>  
>  	if (dev->dev_ops->allmulticast_disable == NULL)
>  		return -ENOTSUP;
> -	dev->data->all_multicast = 0;
> +
>  	diag = dev->dev_ops->allmulticast_disable(dev);
> -	if (diag != 0)
> -		dev->data->all_multicast = 1;
> +	if (!diag)
> +		dev->data->all_multicast = 0;
>  
>  	diag = eth_err(port_id, diag);
>  

Code is fine, but the commit description is misleading.
It is not an optimization, it is a bug fix so that flags
are not set if device callback returns an error.

An optimization is something that is faster but has the
same effect.