[PATCH net 2/2] net: dsa: mt7530: trap frames to conduit in MFC on EN7581 and AN7583
From: Tao <hidden>
Date: 2026-09-19 06:52:34
Also in:
linux-mediatek, lkml, netdev
Subsystem:
mediatek switch driver, networking drivers, networking [dsa], the rest · Maintainers:
Chester A. Unal, Daniel Golle, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Andrew Lunn, Vladimir Oltean, Linus Torvalds
On MT7531 and MT7988 switches, trapped frames forwarding is directed to
CPU ports specified in the MT7531_CFC (0x04) CPU_PMAP bitmap. When support
for EN7581 was introduced, it was assumed to follow the MT7531 model.
However, on Airoha EN7581 and AN7583 switch IP, setting MT7531_CFC alone
is not sufficient for trapped control frames (such as STP BPDUs) to exit
towards the CPU port. The switch forwarding hardware also requires the
MT7530_CPU_EN bit and MT7530_CPU_PORT field to be enabled in MT753X_MFC
(0x10). Without this, trapped frames are dropped by the switch forwarding
logic and never reach the CPU conduit.
Include ID_EN7581 and ID_AN7583 in mt753x_conduit_state_change() to set
MT7530_CPU_EN and MT7530_CPU_PORT in MT753X_MFC when the conduit becomes
operational, matching the handling for MT7530, MT7621, and EN7528.
Fixes: 2b0229f67932 ("net: dsa: mt7530: Add EN7581 support")
Signed-off-by: Tao <redacted>
---
drivers/net/dsa/mt7530.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 863f2079833f..9693a55f553e 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c@@ -3309,7 +3309,8 @@ mt753x_conduit_state_change(struct dsa_switch *ds, * interface is up. */ if (priv->id != ID_MT7530 && priv->id != ID_MT7621 && - priv->id != ID_EN7528) + priv->id != ID_EN7528 && + priv->id != ID_EN7581 && priv->id != ID_AN7583) return; mask = BIT(cpu_dp->index);
--
2.55.0