linux-kernel - Re: [PATCH net-next 3/3] net: dpaa_eth: extract hash using __be32 pointer in rx_default

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Message-ID: <71956f4c-4b08-4ade-a19e-7cda8677c326@csgroup.eu>
Date: Mon, 4 Nov 2024 15:35:31 +0100
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Breno Leitao <leitao@...ian.org>,
 Madalin Bucur <madalin.bucur@....com>, Ioana Ciornei
 <ioana.ciornei@....com>, Radu Bulie <radu-andrei.bulie@....com>,
 Sean Anderson <sean.anderson@...ux.dev>, linux-kernel@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next 3/3] net: dpaa_eth: extract hash using __be32
 pointer in rx_default_dqrr()

Le 29/10/2024 à 17:43, Vladimir Oltean a écrit :
> Sparse provides the following output:
> 
> warning: cast to restricted __be32
> 
> This is a harmless warning due to the fact that we dereference the hash
> stored in the FD using an incorrect type annotation. Suppress the
> warning by using the correct __be32 type instead of u32. No functional
> change.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Acked-by: Christophe Leroy <christophe.leroy@...roup.eu>

> ---
>   drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> index e280013afa63..bf5baef5c3e0 100644
> --- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> @@ -2772,7 +2772,7 @@ static enum qman_cb_dqrr_result rx_default_dqrr(struct qman_portal *portal,
>   	if (net_dev->features & NETIF_F_RXHASH && priv->keygen_in_use &&
>   	    !fman_port_get_hash_result_offset(priv->mac_dev->port[RX],
>   					      &hash_offset)) {
> -		hash = be32_to_cpu(*(u32 *)(vaddr + hash_offset));
> +		hash = be32_to_cpu(*(__be32 *)(vaddr + hash_offset));
>   		hash_valid = true;
>   	}
>