linux-kernel - [PATCH net v2 3/3] net: dsa: rzn1-a5psw: disable learning for standalone ports

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Message-Id: <20230511170202.742087-4-alexis.lothore@bootlin.com>
Date:   Thu, 11 May 2023 19:02:02 +0200
From:   alexis.lothore@...tlin.com
To:     andrew@...n.ch, f.fainelli@...il.com, olteanv@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     linux-renesas-soc@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, thomas.petazzoni@...tlin.com,
        herve.codina@...tlin.com, miquel.raynal@...tlin.com,
        milan.stevanovic@...com, jimmy.lalande@...com,
        pascal.eberhard@...com
Subject: [PATCH net v2 3/3] net: dsa: rzn1-a5psw: disable learning for standalone ports

From: Clément Léger <clement.leger@...tlin.com>

When ports are in standalone mode, they should have learning disabled to
avoid adding new entries in the MAC lookup table which might be used by
other bridge ports to forward packets. While adding that, also make sure
learning is enabled for CPU port.

Fixes: 888cdb892b61 ("net: dsa: rzn1-a5psw: add Renesas RZ/N1 advanced 5 port switch driver")
Signed-off-by: Clément Léger <clement.leger@...tlin.com>
Signed-off-by: Alexis Lothoré <alexis.lothore@...tlin.com>
---
 drivers/net/dsa/rzn1_a5psw.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/net/dsa/rzn1_a5psw.c b/drivers/net/dsa/rzn1_a5psw.c
index a3acac29ffa6..02f83d19656a 100644
--- a/drivers/net/dsa/rzn1_a5psw.c
+++ b/drivers/net/dsa/rzn1_a5psw.c
@@ -340,6 +340,14 @@ static void a5psw_flooding_set_resolution(struct a5psw *a5psw, int port,
 		a5psw_reg_writel(a5psw, offsets[i], a5psw->bridged_ports);
 }
 
+static void a5psw_port_set_standalone(struct a5psw *a5psw, int port,
+				      bool standalone)
+{
+	a5psw_port_learning_set(a5psw, port, !standalone);
+	a5psw_flooding_set_resolution(a5psw, port, !standalone);
+	a5psw_port_mgmtfwd_set(a5psw, port, standalone);
+}
+
 static int a5psw_port_bridge_join(struct dsa_switch *ds, int port,
 				  struct dsa_bridge bridge,
 				  bool *tx_fwd_offload,
@@ -355,8 +363,7 @@ static int a5psw_port_bridge_join(struct dsa_switch *ds, int port,
 	}
 
 	a5psw->br_dev = bridge.dev;
-	a5psw_flooding_set_resolution(a5psw, port, true);
-	a5psw_port_mgmtfwd_set(a5psw, port, false);
+	a5psw_port_set_standalone(a5psw, port, false);
 
 	return 0;
 }
@@ -366,8 +373,7 @@ static void a5psw_port_bridge_leave(struct dsa_switch *ds, int port,
 {
 	struct a5psw *a5psw = ds->priv;
 
-	a5psw_flooding_set_resolution(a5psw, port, false);
-	a5psw_port_mgmtfwd_set(a5psw, port, true);
+	a5psw_port_set_standalone(a5psw, port, true);
 
 	/* No more ports bridged */
 	if (a5psw->bridged_ports == BIT(A5PSW_CPU_PORT))
@@ -761,13 +767,15 @@ static int a5psw_setup(struct dsa_switch *ds)
 		if (dsa_port_is_unused(dp))
 			continue;
 
-		/* Enable egress flooding for CPU port */
-		if (dsa_port_is_cpu(dp))
+		/* Enable egress flooding and learning for CPU port */
+		if (dsa_port_is_cpu(dp)) {
 			a5psw_flooding_set_resolution(a5psw, port, true);
+			a5psw_port_learning_set(a5psw, port, true);
+		}
 
-		/* Enable management forward only for user ports */
+		/* Enable standalone mode for user ports */
 		if (dsa_port_is_user(dp))
-			a5psw_port_mgmtfwd_set(a5psw, port, true);
+			a5psw_port_set_standalone(a5psw, port, true);
 	}
 
 	return 0;
-- 
2.40.1