linux-kernel - [net-next PATCH 3/3] net: dsa: qca8k: limit user ports access to the first CPU port on setup

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Message-Id: <20230724033058.16795-3-ansuelsmth@gmail.com>
Date:   Mon, 24 Jul 2023 05:30:58 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     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>,
        Christian Marangi <ansuelsmth@...il.com>,
        Atin Bainada <hi@...nb.me>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [net-next PATCH 3/3] net: dsa: qca8k: limit user ports access to the first CPU port on setup

In preparation for multi-CPU support, set CPU port LOOKUP MEMBER outside
the port loop and setup the LOOKUP MEMBER mask for user ports only to
the first CPU port.

This is to handle flooding condition where every CPU port is set as
target and prevent packet duplication for unknown frames from user ports.

Secondary CPU port LOOKUP MEMBER mask will be setup later when
port_change_master will be implemented.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 drivers/net/dsa/qca/qca8k-8xxx.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/net/dsa/qca/qca8k-8xxx.c b/drivers/net/dsa/qca/qca8k-8xxx.c
index 31552853fdd4..6286a64a2fe3 100644
--- a/drivers/net/dsa/qca/qca8k-8xxx.c
+++ b/drivers/net/dsa/qca/qca8k-8xxx.c
@@ -1850,18 +1850,16 @@ qca8k_setup(struct dsa_switch *ds)
 	if (ret)
 		return ret;
 
+	/* CPU port gets connected to all user ports of the switch */
+	ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(cpu_port),
+			QCA8K_PORT_LOOKUP_MEMBER, dsa_user_ports(ds));
+	if (ret)
+		return ret;
+
 	/* Setup connection between CPU port & user ports
 	 * Configure specific switch configuration for ports
 	 */
 	for (i = 0; i < QCA8K_NUM_PORTS; i++) {
-		/* CPU port gets connected to all user ports of the switch */
-		if (dsa_is_cpu_port(ds, i)) {
-			ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(i),
-					QCA8K_PORT_LOOKUP_MEMBER, dsa_user_ports(ds));
-			if (ret)
-				return ret;
-		}
-
 		/* Individual user ports get connected to CPU port only */
 		if (dsa_is_user_port(ds, i)) {
 			ret = qca8k_rmw(priv, QCA8K_PORT_LOOKUP_CTRL(i),
-- 
2.40.1