From: Arınç ÜNAL <arinc.unal@xxxxxxxxxx>
[ Upstream commit 8332cf6fd7c7087dbc2067115b33979c9851bbc4 ]
LLDP frames are link-local frames, therefore they must be trapped to the
CPU port. Currently, the MT753X switches treat LLDP frames as regular
multicast frames, therefore flooding them to user ports. To fix this, set
LLDP frames to be trapped to the CPU port(s).
Fixes: b8f126a8d543 ("net-next: dsa: add dsa support for Mediatek MT7530 switch")
Signed-off-by: Arınç ÜNAL <arinc.unal@xxxxxxxxxx>
Reviewed-by: Vladimir Oltean <olteanv@xxxxxxxxx>
Reviewed-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
Reviewed-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/dsa/mt7530.c | 4 ++++
drivers/net/dsa/mt7530.h | 5 +++++
2 files changed, 9 insertions(+)
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 40be635d2ecc9..e542f5dbe5831 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -997,6 +997,10 @@ mt753x_trap_frames(struct mt7530_priv *priv)
/* Trap BPDUs to the CPU port(s) */
mt7530_rmw(priv, MT753X_BPC, MT753X_BPDU_PORT_FW_MASK,
MT753X_BPDU_CPU_ONLY);
+
+ /* Trap LLDP frames with :0E MAC DA to the CPU port(s) */
+ mt7530_rmw(priv, MT753X_RGAC2, MT753X_R0E_PORT_FW_MASK,
+ MT753X_R0E_PORT_FW(MT753X_BPDU_CPU_ONLY));
}
static int
diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h
index 6b2fc6290ea84..31c0f7156b699 100644
--- a/drivers/net/dsa/mt7530.h
+++ b/drivers/net/dsa/mt7530.h
@@ -65,6 +65,11 @@ enum mt753x_id {
#define MT753X_BPC 0x24
#define MT753X_BPDU_PORT_FW_MASK GENMASK(2, 0)
+/* Register for :03 and :0E MAC DA frame control */
+#define MT753X_RGAC2 0x2c
+#define MT753X_R0E_PORT_FW_MASK GENMASK(18, 16)
+#define MT753X_R0E_PORT_FW(x) FIELD_PREP(MT753X_R0E_PORT_FW_MASK, x)
+
enum mt753x_bpdu_port_fw {
MT753X_BPDU_FOLLOW_MFC,
MT753X_BPDU_CPU_EXCLUDE = 4,
--
2.39.2
