[openwrt/openwrt] realtek: Trap LLDP packets to the CPU

[LEDE Commits]

svanheule pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/5a5c52085a5bd0b1b8bc629f3586c7a93dcb4460

commit 5a5c52085a5bd0b1b8bc629f3586c7a93dcb4460
Author: Kevin Jilissen <info at kevinjilissen.nl>
AuthorDate: Sat May 4 16:12:20 2024 +0200

    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 <info at kevinjilissen.nl>
---
 target/linux/realtek/files-5.15/drivers/net/dsa/rtl83xx/dsa.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/target/linux/realtek/files-5.15/drivers/net/dsa/rtl83xx/dsa.c b/target/linux/realtek/files-5.15/drivers/net/dsa/rtl83xx/dsa.c
index ff81a4c77b..9eb444515f 100644
--- a/target/linux/realtek/files-5.15/drivers/net/dsa/rtl83xx/dsa.c
+++ b/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;