This is a note to let you know that I've just added the patch titled
net: dsa: mt7530: fix handling of LLDP frames
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-dsa-mt7530-fix-handling-of-lldp-frames.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a28a6e0db6eb71a55b2172da42caab72289aebe7
Author: Arınç ÜNAL <arinc.unal@xxxxxxxxxx>
Date: Sat Jun 17 09:26:47 2023 +0300
net: dsa: mt7530: fix handling of LLDP frames
[ 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>
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index ec43edcaa7d9f..51d2ef0dc835c 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -1004,6 +1004,10 @@ 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 e8d9664353504..9a45663d8b4ef 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,
