[openwrt/openwrt] realtek: fix RTL839x egress tag for ports >= 32

[LEDE Commits]

svanheule pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/d924a75be360dfddc69cd8dedd2fc88aa19598a1

commit d924a75be360dfddc69cd8dedd2fc88aa19598a1
Author: Jan Hoffmann <jan at 3e8.eu>
AuthorDate: Sun Sep 25 14:32:31 2022 +0200

    realtek: fix RTL839x egress tag for ports >= 32
    
    Don't overwrite AS_DPM and L2LEARNING flags when dest_port is >= 32.
    
    Fixes: 1773264a0c6d ("realtek: correct egress frame port verification")
    Signed-off-by: Jan Hoffmann <jan at 3e8.eu>
---
 target/linux/realtek/files-5.10/drivers/net/ethernet/rtl838x_eth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/realtek/files-5.10/drivers/net/ethernet/rtl838x_eth.c b/target/linux/realtek/files-5.10/drivers/net/ethernet/rtl838x_eth.c
index e96c5a7216..d497b4cc8c 100644
--- a/target/linux/realtek/files-5.10/drivers/net/ethernet/rtl838x_eth.c
+++ b/target/linux/realtek/files-5.10/drivers/net/ethernet/rtl838x_eth.c
@@ -116,7 +116,7 @@ static void rtl839x_create_tx_header(struct p_hdr *h, unsigned int dest_port, in
 	// h->cpu_tag[1] |= BIT(1) | BIT(0); // Bypass filter 1/2
 	if (dest_port >= 32) {
 		dest_port -= 32;
-		h->cpu_tag[2] = BIT(dest_port) >> 16;
+		h->cpu_tag[2] |= (BIT(dest_port) >> 16) & 0xf;
 		h->cpu_tag[3] = BIT(dest_port) & 0xffff;
 	} else {
 		h->cpu_tag[4] = BIT(dest_port) >> 16;