[PATCH] realtek: Trap all frames with switch as destination to CPU-port

Birger Koblitz mail at birger-koblitz.de
Sun Apr 24 11:37:33 PDT 2022

This fixes a bug where frames sent to the switch itself were
flooded to all ports unless the MAC address of the CPU-port
was learned otherwise.

Tested-by: Wenli Looi <wlooi at ucalgary.ca>
Tested-by: Bjørn Mork <bjorn at mork.no>
Signed-off-by: Birger Koblitz <git at birger-koblitz.de>
This was previously sent as a patch with a wrong subject
"[PATCH] realtek: do not reset SerDes on link change"

 .../linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/dsa.c  | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/dsa.c b/target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/dsa.c
index 4780632983..858b692640 100644
--- a/target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/dsa.c
+++ b/target/linux/realtek/files-5.10/drivers/net/dsa/rtl83xx/dsa.c
@@ -205,6 +205,12 @@ static int rtl83xx_setup(struct dsa_switch *ds)


+	// Make sure all frames sent to the switch's MAC are trapped to the CPU-port
+	if (priv->family_id == RTL8380_FAMILY_ID)
+	    sw_w32(0x2, RTL838X_SPCL_TRAP_SWITCH_MAC_CTRL);  // 0: FWD, 1: DROP, 2: TRAP2CPU
+	else
+	    sw_w32(0x2, RTL839X_SPCL_TRAP_SWITCH_MAC_CTRL);
 	/* Enable MAC Polling PHY again */
 	pr_debug("Please wait until PHY is settled\n");

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