linux-kernel - Re: [PATCH net v1 4/6] net: dsa: microchip: ksz8: ksz8_fdb_dump: avoid extracting ghost entry from empty dynamic MAC table.

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Message-ID: <f543b3f32b631b48e64f0edef97272afa27ad241.camel@microchip.com>
Date:   Fri, 24 Mar 2023 04:04:06 +0000
From:   <Arun.Ramadoss@...rochip.com>
To:     <olteanv@...il.com>, <andrew@...n.ch>, <f.fainelli@...il.com>,
        <kuba@...nel.org>, <edumazet@...gle.com>, <pabeni@...hat.com>,
        <o.rempel@...gutronix.de>, <Woojung.Huh@...rochip.com>,
        <davem@...emloft.net>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <UNGLinuxDriver@...rochip.com>, <kernel@...gutronix.de>
Subject: Re: [PATCH net v1 4/6] net: dsa: microchip: ksz8: ksz8_fdb_dump:
 avoid extracting ghost entry from empty dynamic MAC table.

Hi Oleksij,

On Wed, 2023-03-22 at 15:31 +0100, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> If the dynamic MAC table is empty, we will still extract one outdated
> entry. Fix it by using correct bit offset.
> 
> Fixes: d23a5e18606c ("net: dsa: microchip: move ksz8->masks to
> ksz_common")
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/net/dsa/microchip/ksz_common.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/dsa/microchip/ksz_common.c
> b/drivers/net/dsa/microchip/ksz_common.c
> index c914449645ca..4929fb29ed06 100644
> --- a/drivers/net/dsa/microchip/ksz_common.c
> +++ b/drivers/net/dsa/microchip/ksz_common.c
> @@ -408,7 +408,7 @@ static const u32 ksz8863_masks[] = {
>         [STATIC_MAC_TABLE_OVERRIDE]     = BIT(20),
>         [STATIC_MAC_TABLE_FWD_PORTS]    = GENMASK(18, 16),
>         [DYNAMIC_MAC_TABLE_ENTRIES_H]   = GENMASK(1, 0),
> -       [DYNAMIC_MAC_TABLE_MAC_EMPTY]   = BIT(7),
> +       [DYNAMIC_MAC_TABLE_MAC_EMPTY]   = BIT(2),

Cross verified the bit mask with datasheet.
Patch Looks good to me.

Acked-by: Arun Ramadoss <arun.ramadoss@...rochip.com>

>         [DYNAMIC_MAC_TABLE_NOT_READY]   = BIT(7),
>         [DYNAMIC_MAC_TABLE_ENTRIES]     = GENMASK(31, 24),
>         [DYNAMIC_MAC_TABLE_FID]         = GENMASK(19, 16),
> --
> 2.30.2
>