linux-kernel - Re: [PATCH 1/3] net: macb: check constant to define and fix _

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Date:   Thu, 22 Jun 2023 17:49:30 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Ben Dooks <ben.dooks@...ethink.co.uk>
Cc:     netdev@...r.kernel.org, pabeni@...hat.com, kuba@...nel.org,
        edumazet@...gle.com, davem@...emloft.net,
        linux-kernel@...r.kernel.org, claudiu.beznea@...rochip.com,
        nicolas.ferre@...rochip.com
Subject: Re: [PATCH 1/3] net: macb: check constant to define and fix __be32
 warnings

On Thu, Jun 22, 2023 at 02:05:05PM +0100, Ben Dooks wrote:
> The checks on ipv4 addresses in the filtering code check against
> a constant of 0xFFFFFFFF, so replace it with MACB_IPV4_MASK and
> then make sure it is of __be32 type to avoid the following
> sparse warnigns:
> 
> drivers/net/ethernet/cadence/macb_main.c:3448:39: warning: restricted __be32 degrades to integer
> drivers/net/ethernet/cadence/macb_main.c:3453:39: warning: restricted __be32 degrades to integer
> drivers/net/ethernet/cadence/macb_main.c:3483:20: warning: restricted __be32 degrades to integer
> drivers/net/ethernet/cadence/macb_main.c:3497:20: warning: restricted __be32 degrades to integer
> 
> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
> ---
>  drivers/net/ethernet/cadence/macb_main.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> index f20ec0d5260b..538d4c7e023b 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -3418,6 +3418,8 @@ static int macb_get_ts_info(struct net_device *netdev,
>  	return ethtool_op_get_ts_info(netdev, info);
>  }
>  
> +#define MACB_IPV4_MASK htonl(0xFFFFFFFF)
> +

Hi Ben,

according to a recent thread, it seems that the preferred approach might be
~(__le32)0.

https://lore.kernel.org/netdev/20230522153615.247577-1-minhuadotchen@gmail.com/