linux-kernel - Re: [PATCH net-next 1/2] net: dsa: mt7530: factor out bridge join/leave logic

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Date: Sun, 16 Jun 2024 09:49:48 +0300
From: Arınç ÜNAL <arinc.unal@...nc9.com>
To: Matthias Schiffer <mschiffer@...verse-factory.net>,
 Daniel Golle <daniel@...rotopia.org>, DENG Qingfang <dqfext@...il.com>,
 Sean Wang <sean.wang@...iatek.com>
Cc: 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>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next 1/2] net: dsa: mt7530: factor out bridge
 join/leave logic

On 15/06/2024 01:21, Matthias Schiffer wrote:
> As preparation for implementing bridge port isolation, move the logic to
> add and remove bits in the port matrix into a new helper
> mt7530_update_port_member(), which is called from
> mt7530_port_bridge_join() and mt7530_port_bridge_leave().
> 
> No functional change intended.
> 
> Signed-off-by: Matthias Schiffer <mschiffer@...verse-factory.net>
> ---
>   drivers/net/dsa/mt7530.c | 103 +++++++++++++++++----------------------
>   1 file changed, 46 insertions(+), 57 deletions(-)
> 
> diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
> index 598434d8d6e4..ecacaefdd694 100644
> --- a/drivers/net/dsa/mt7530.c
> +++ b/drivers/net/dsa/mt7530.c
> @@ -1302,6 +1302,50 @@ mt7530_stp_state_set(struct dsa_switch *ds, int port, u8 state)
>   		   FID_PST(FID_BRIDGED, stp_state));
>   }
>   
> +static void mt7530_update_port_member(struct mt7530_priv *priv, int port,
> +				      const struct net_device *bridge_dev, bool join)
> +	__must_hold(&priv->reg_mutex)

Please run git clang-format on the patch.

> +{
> +	struct dsa_port *dp = dsa_to_port(priv->ds, port), *other_dp;
> +	struct mt7530_port *p = &priv->ports[port], *other_p;
> +	struct dsa_port *cpu_dp = dp->cpu_dp;
> +	u32 port_bitmap = BIT(cpu_dp->index);
> +	int other_port;
> +
> +	dsa_switch_for_each_user_port(other_dp, priv->ds) {
> +		other_port = other_dp->index;
> +		other_p = &priv->ports[other_port];
> +
> +		if (dp == other_dp)
> +			continue;
> +
> +		/* Add/remove this port to/from the port matrix of the other
> +		 * ports in the same bridge. If the port is disabled, port
> +		 * matrix is kept and not being setup until the port becomes
> +		 * enabled.
> +		 */
> +		if (!dsa_port_offloads_bridge_dev(other_dp, bridge_dev))

Would be helpful to mention in the patch log that
dsa_port_offloads_bridge_dev() is now being used instead of
dsa_port_offloads_bridge().

> +			continue;
> +
> +		if (join) {
> +			other_p->pm |= PCR_MATRIX(BIT(port));
> +			port_bitmap |= BIT(other_port);
> +		} else {
> +			other_p->pm &= ~PCR_MATRIX(BIT(port));
> +		}
> +
> +		if (other_p->enable)
> +			mt7530_rmw(priv, MT7530_PCR_P(other_port),
> +				   PCR_MATRIX_MASK, other_p->pm);
> +	}
> +
> +	/* Add/remove the all other ports to this port matrix. */

I would add to this comment: When removing, only the CPU port will remain
in the port matrix of this port.

To not omit the original comment:

	/* Set the cpu port to be the only one in the port matrix of
	 * this port.
	 */

> +	p->pm = PCR_MATRIX(port_bitmap);
> +	if (priv->ports[port].enable)
> +		mt7530_rmw(priv, MT7530_PCR_P(port),
> +			   PCR_MATRIX_MASK, p->pm);

I see changes to have the code streamlined. Overall, I would appreciate a
more verbose patch log.

Arınç