linux-kernel - Re: [PATCH net-next] net: dsa: yt921x: Fix MIB attribute table

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Message-ID: <10541c3d-07b8-4dd7-8a17-b122b1b81996@bootlin.com>
Date: Tue, 18 Nov 2025 15:10:59 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: David Yang <mmyangfl@...il.com>, netdev@...r.kernel.org
Cc: Andrew Lunn <andrew@...n.ch>, Vladimir Oltean <olteanv@...il.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: dsa: yt921x: Fix MIB attribute table

Hi David,

On 18/11/2025 10:12, David Yang wrote:
> There are holes in the MIB field I didn't notice, leading to wrong
> statistics after stress tests.
> 
> Signed-off-by: David Yang <mmyangfl@...il.com>

Even if this is fixing a patch that's still in net-next, you may want to
add a fixes tag, as this is a bugfix :/

Maxime

> ---
>  drivers/net/dsa/yt921x.c | 22 +++++++++++-----------
>  1 file changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/dsa/yt921x.c b/drivers/net/dsa/yt921x.c
> index 944988e29127..97fc6085f4d0 100644
> --- a/drivers/net/dsa/yt921x.c
> +++ b/drivers/net/dsa/yt921x.c
> @@ -56,13 +56,13 @@ static const struct yt921x_mib_desc yt921x_mib_descs[] = {
>  
>  	MIB_DESC(1, 0x30, NULL),	/* RxPktSz1024To1518 */
>  	MIB_DESC(1, 0x34, NULL),	/* RxPktSz1519ToMax */
> -	MIB_DESC(2, 0x38, NULL),	/* RxGoodBytes */
> -	/* 0x3c */
> +	/* 0x38 unused */
> +	MIB_DESC(2, 0x3c, NULL),	/* RxGoodBytes */
>  
> -	MIB_DESC(2, 0x40, "RxBadBytes"),
> -	/* 0x44 */
> -	MIB_DESC(2, 0x48, NULL),	/* RxOverSzErr */
> -	/* 0x4c */
> +	/* 0x40 */
> +	MIB_DESC(2, 0x44, "RxBadBytes"),
> +	/* 0x48 */
> +	MIB_DESC(1, 0x4c, NULL),	/* RxOverSzErr */
>  
>  	MIB_DESC(1, 0x50, NULL),	/* RxDropped */
>  	MIB_DESC(1, 0x54, NULL),	/* TxBroadcast */
> @@ -79,10 +79,10 @@ static const struct yt921x_mib_desc yt921x_mib_descs[] = {
>  	MIB_DESC(1, 0x78, NULL),	/* TxPktSz1024To1518 */
>  	MIB_DESC(1, 0x7c, NULL),	/* TxPktSz1519ToMax */
>  
> -	MIB_DESC(2, 0x80, NULL),	/* TxGoodBytes */
> -	/* 0x84 */
> -	MIB_DESC(2, 0x88, NULL),	/* TxCollision */
> -	/* 0x8c */
> +	/* 0x80 unused */
> +	MIB_DESC(2, 0x84, NULL),	/* TxGoodBytes */
> +	/* 0x88 */
> +	MIB_DESC(1, 0x8c, NULL),	/* TxCollision */
>  
>  	MIB_DESC(1, 0x90, NULL),	/* TxExcessiveCollistion */
>  	MIB_DESC(1, 0x94, NULL),	/* TxMultipleCollision */
> @@ -705,7 +705,7 @@ static int yt921x_read_mib(struct yt921x_priv *priv, int port)
>  			res = yt921x_reg_read(priv, reg + 4, &val1);
>  			if (res)
>  				break;
> -			val = ((u64)val0 << 32) | val1;
> +			val = ((u64)val1 << 32) | val0;
>  		}
>  
>  		WRITE_ONCE(*valp, val);