realtek: Trap LLDP packets to the CPU

We should setup the registers for trapping LLDP packets to the CPU.
Currently, these packets are forwarded to all ports which is not desired
behaviour.

Signed-off-by: Kevin Jilissen <[email protected]>

target/linux/realtek/files-5.15/drivers/net/dsa/rtl83xx/dsa.c

@@ -155,6 +155,12 @@ static void rtl83xx_setup_bpdu_traps(struct rtl838x_switch_priv *priv)
 		priv->r->set_receive_management_action(i, BPDU, TRAP2CPU);
 }
 
+static void rtl83xx_setup_lldp_traps(struct rtl838x_switch_priv *priv)
+{
+	for (int i = 0; i < priv->cpu_port; i++)
+		priv->r->set_receive_management_action(i, LLDP, TRAP2CPU);
+}
+
 static void rtl83xx_port_set_salrn(struct rtl838x_switch_priv *priv,
 				   int port, bool enable)
 {
@@ -207,6 +213,7 @@ static int rtl83xx_setup(struct dsa_switch *ds)
 	rtl83xx_vlan_setup(priv);
 
 	rtl83xx_setup_bpdu_traps(priv);
+	rtl83xx_setup_lldp_traps(priv);
 
 	ds->configure_vlan_while_not_filtering = true;