linux-kernel - Re: [PATCH net v4 5/7] net: dsa: mt7530: fix handling of LLDP frames

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Date:   Wed, 14 Jun 2023 17:35:30 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     arinc9.unal@...il.com
Cc:     Arınç ÜNAL <arinc.unal@...nc9.com>,
        Daniel Golle <daniel@...rotopia.org>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        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>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
        mithat.guner@...ont.com, erkin.bozoglu@...ont.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net v4 5/7] net: dsa: mt7530: fix handling of LLDP frames

On Mon, Jun 12, 2023 at 10:59:43AM +0300, arinc9.unal@...il.com wrote:
> diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
> index e4c169843f2e..8388b058fbe4 100644
> --- a/drivers/net/dsa/mt7530.c
> +++ b/drivers/net/dsa/mt7530.c
> @@ -2261,7 +2261,11 @@ mt7530_setup(struct dsa_switch *ds)
>  
>  	/* Trap BPDUs to the CPU port */
>  	mt7530_rmw(priv, MT753X_BPC, MT753X_BPDU_PORT_FW_MASK,
> -		   MT753X_BPDU_CPU_ONLY);
> +		   MT753X_PORT_FW_CPU_ONLY);
> +
> +	/* Trap LLDP frames with :0E MAC DA to the CPU port */
> +	mt7530_rmw(priv, MT753X_RGAC2, MT753X_R0E_PORT_FW_MASK,
> +		   MT753X_R0E_PORT_FW(MT753X_PORT_FW_CPU_ONLY));
>  
>  	/* Enable and reset MIB counters */
>  	mt7530_mib_reset(ds);
> @@ -2364,7 +2368,11 @@ mt7531_setup_common(struct dsa_switch *ds)
>  
>  	/* Trap BPDUs to the CPU port(s) */
>  	mt7530_rmw(priv, MT753X_BPC, MT753X_BPDU_PORT_FW_MASK,
> -		   MT753X_BPDU_CPU_ONLY);
> +		   MT753X_PORT_FW_CPU_ONLY);
> +
> +	/* Trap LLDP frames with :0E MAC DA to the CPU port(s) */
> +	mt7530_rmw(priv, MT753X_RGAC2, MT753X_R0E_PORT_FW_MASK,
> +		   MT753X_R0E_PORT_FW(MT753X_PORT_FW_CPU_ONLY));

Looking at the above two hunks, they look 100% identical. Given that
they are both setting up trapping to the CPU port, maybe they should
be moved into their own common function called from both setup()
functions?

-- 
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