linux-kernel - [PATCH] Fix Flooding: Disable by default on User ports and Enable on CPU ports

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Date:   Sun, 12 Feb 2023 22:40:27 +0100
From:   Richard van Schagen <richard@...terhints.com>
To:     Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>, 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>,
        Arinc Unal <arinc.unal@...nc9.com>,
        Frank Wunderlich <frank-w@...lic-files.de>
Cc:     Richard van Schagen <richard@...terhints.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH] Fix Flooding: Disable by default on User ports and Enable on CPU ports

---
 drivers/net/dsa/mt7530.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index f98a94361c84..f456541a68bc 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -997,6 +997,7 @@ mt753x_cpu_port_enable(struct dsa_switch *ds, int port)
 {
 	struct mt7530_priv *priv = ds->priv;
 	int ret;
+	u32 val;
 
 	/* Setup max capability of CPU port at first */
 	if (priv->info->cpu_port_config) {
@@ -1009,9 +1010,10 @@ mt753x_cpu_port_enable(struct dsa_switch *ds, int port)
 	mt7530_write(priv, MT7530_PVC_P(port),
 		     PORT_SPEC_TAG);
 
-	/* Disable flooding by default */
-	mt7530_rmw(priv, MT7530_MFC, BC_FFP_MASK | UNM_FFP_MASK | UNU_FFP_MASK,
-		   BC_FFP(BIT(port)) | UNM_FFP(BIT(port)) | UNU_FFP(BIT(port)));
+	/* Enable flooding on CPU */
+	val = mt7530_read(priv, MT7530_MFC);
+	val |= BC_FFP(BIT(port)) | UNM_FFP(BIT(port)) | UNU_FFP(BIT(port));
+	mt7530_write(priv, MT7530_MFC, val);
 
 	/* Set CPU port number */
 	if (priv->id == ID_MT7621)
@@ -2155,6 +2157,9 @@ mt7530_setup(struct dsa_switch *ds)
 
 	priv->p6_interface = PHY_INTERFACE_MODE_NA;
 
+	/* Disable flooding by default */
+	mt7530_rmw(priv, MT7530_MFC, BC_FFP_MASK | UNM_FFP_MASK | UNU_FFP_MASK, 0);
+
 	/* Enable and reset MIB counters */
 	mt7530_mib_reset(ds);
 
@@ -2346,6 +2351,9 @@ mt7531_setup(struct dsa_switch *ds)
 	mt7530_rmw(priv, MT753X_BPC, MT753X_BPDU_PORT_FW_MASK,
 		   MT753X_BPDU_CPU_ONLY);
 
+	/* Disable flooding by default */
+	mt7530_rmw(priv, MT7530_MFC, BC_FFP_MASK | UNM_FFP_MASK | UNU_FFP_MASK, 0);
+
 	/* Enable and reset MIB counters */
 	mt7530_mib_reset(ds);
 
-- 
2.30.2