realtek: fix egress port mask on rtl839x

The flag to enable the outgoing port mask is in CPU header bit 43, with
bit 0 being the leftmost bit of the header. This corresponds to BIT(4)
in the third 16-bit value of the header.

Correctly set AS_DPM by fixing the off-by-one error.

Fixes: 9eab76c84e31 ("realtek: Improve TX CPU-Tag usage")
Tested-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
Signed-off-by: Sander Vanheule <sander@svanheule.net>
(cherry picked from commit d9516cacb087fed7716b34b1e02ce956bb6c27f1)

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 cf6aabc6142ff34020103e0d34d3721d37cd8a31..aece1356e40cf307d1fa92005f1d53a5c948c076 100644 (file)
--- 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
@@ -126,7 +126,7 @@ static void rtl839x_create_tx_header(struct p_hdr *h, int dest_port, int prio)
                        h->cpu_tag[4] = BIT(dest_port) >> 16;
                        h->cpu_tag[5] = BIT(dest_port) & 0xffff;
                }
-               h->cpu_tag[2] |= BIT(5); // Enable destination port mask use
+               h->cpu_tag[2] |= BIT(4); // Enable destination port mask use
                h->cpu_tag[2] |= BIT(8); // Enable L2 Learning
                // Set internal priority and AS_PRIO
                if (prio >= 0)