linux-kernel - Re: [PATCH net-next 01/15] net: dsa: mt7530: always trap frames to active CPU port on MT7530

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Date:   Sun, 19 Nov 2023 14:25:27 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Arınç ÜNAL <arinc.unal@...nc9.com>
Cc:     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>,
        "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>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
        mithat.guner@...ont.com, erkin.bozoglu@...ont.com
Subject: Re: [PATCH net-next 01/15] net: dsa: mt7530: always trap frames to
 active CPU port on MT7530

On Sat, Nov 18, 2023 at 03:31:51PM +0300, Arınç ÜNAL wrote:
> +static void
> +mt753x_conduit_state_change(struct dsa_switch *ds,
> +			    const struct net_device *conduit,
> +			    bool operational)
> +{
> +	struct mt7530_priv *priv = ds->priv;
> +	struct dsa_port *cpu_dp = conduit->dsa_ptr;

nitpick: reverse Christmas tree variable ordering

> +
> +	/* Set the CPU port to trap frames to for MT7530. Trapped frames will be
> +	 * forwarded to the numerically smallest CPU port which the DSA conduit
> +	 * interface its affine to is up.
> +	 */
> +	if (priv->id != ID_MT7530 && priv->id != ID_MT7621)
> +		return;
> +
> +	if (operational)
> +		priv->active_cpu_ports |= BIT(cpu_dp->index);
> +	else
> +		priv->active_cpu_ports &= ~BIT(cpu_dp->index);
> +
> +	if (priv->active_cpu_ports)
> +		mt7530_rmw(priv, MT7530_MFC, CPU_EN | CPU_PORT_MASK, CPU_EN |
> +			   CPU_PORT(__ffs(priv->active_cpu_ports)));
> +}