This is a note to let you know that I've just added the patch titled
net: dsa: mt7530: Fix traffic flooding for MMIO devices
to the 6.6-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-traffic-flooding-for-mmio-devices.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5d64f00e8490a496e5cfe213f303a0338f318397
Author: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
Date: Tue Mar 4 09:50:23 2025 +0100
net: dsa: mt7530: Fix traffic flooding for MMIO devices
[ Upstream commit ccc2f5a436fbb0ae1fb598932a9b8e48423c1959 ]
On MMIO devices (e.g. MT7988 or EN7581) unicast traffic received on lanX
port is flooded on all other user ports if the DSA switch is configured
without VLAN support since PORT_MATRIX in PCR regs contains all user
ports. Similar to MDIO devices (e.g. MT7530 and MT7531) fix the issue
defining default VLAN-ID 0 for MT7530 MMIO devices.
Fixes: 110c18bfed414 ("net: dsa: mt7530: introduce driver for MT7988 built-in switch")
Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
Reviewed-by: Chester A. Unal <chester.a.unal@xxxxxxxxxx>
Link: https://patch.msgid.link/20250304-mt7988-flooding-fix-v1-1-905523ae83e9@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 53ead0989777f..90ab2f1058ce0 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2640,7 +2640,8 @@ mt7531_setup_common(struct dsa_switch *ds)
if (ret < 0)
return ret;
- return 0;
+ /* Setup VLAN ID 0 for VLAN-unaware bridges */
+ return mt7530_setup_vlan0(priv);
}
static int
@@ -2734,11 +2735,6 @@ mt7531_setup(struct dsa_switch *ds)
mt7531_setup_common(ds);
- /* Setup VLAN ID 0 for VLAN-unaware bridges */
- ret = mt7530_setup_vlan0(priv);
- if (ret)
- return ret;
-
ds->assisted_learning_on_cpu_port = true;
ds->mtu_enforcement_ingress = true;
