[PATCH net 2/2] net: dsa: mt7530: trap frames to conduit in MFC on EN7581 and AN7583

[Tao]

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 <gongtao0607 at gmail.com>
---
 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