linux-kernel - Re: [PATCH net-next 2/3] net: dsa: qca8k: factor out bridge join/leave logic

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Date: Fri, 21 Jun 2024 19:48:08 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: Matthias Schiffer <mschiffer@...verse-factory.net>
Cc: 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>,
	Christian Marangi <ansuelsmth@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 2/3] net: dsa: qca8k: factor out bridge
 join/leave logic

On Thu, Jun 20, 2024 at 07:25:49PM +0200, Matthias Schiffer wrote:
> diff --git a/drivers/net/dsa/qca/qca8k-common.c b/drivers/net/dsa/qca/qca8k-common.c
> index b33df84070d3..09108fa99dbe 100644
> --- a/drivers/net/dsa/qca/qca8k-common.c
> +++ b/drivers/net/dsa/qca/qca8k-common.c
> @@ -614,6 +614,49 @@ void qca8k_port_stp_state_set(struct dsa_switch *ds, int port, u8 state)
>  	qca8k_port_configure_learning(ds, port, learning);
>  }
>  
> +static int qca8k_update_port_member(struct qca8k_priv *priv, int port,
> +				    const struct net_device *bridge_dev,
> +				    bool join)
> +{
> +	struct dsa_port *dp = dsa_to_port(priv->ds, port), *other_dp;
> +	u32 port_mask = BIT(dp->cpu_dp->index);
> +	int i, ret;
> +
> +	for (i = 0; i < QCA8K_NUM_PORTS; i++) {
> +		if (i == port)
> +			continue;
> +		if (dsa_is_cpu_port(priv->ds, i))
> +			continue;
> +
> +		other_dp = dsa_to_port(priv->ds, i);

I would have liked to see less of the "dsa_to_port() in a loop"
antipattern.
https://lore.kernel.org/netdev/20211018152136.2595220-7-vladimir.oltean@nxp.com/T/

I'll send a patch which refactors the new function to use
dsa_switch_for_each_user_port().