net-next: ethernet: mediatek: add CDM able to recognize the tag for DSA
The patch adds the setup for allowing CDM can recognize these packets with
carrying port-distinguishing tag. Otherwise, these tagging packets will be
handled incorrectly by CDM. The setup is also working out for general
untag packets as well.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Landen Chao <Landen.Chao@mediatek.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index bf6317e..f60e545e0 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1846,6 +1846,12 @@ static int mtk_hw_init(struct mtk_eth *eth)
/* GE2, Force 1000M/FD, FC ON */
mtk_w32(eth, MAC_MCR_FIXED_LINK, MTK_MAC_MCR(1));
+ /* Indicates CDM to parse the MTK special tag from CPU
+ * which also is working out for untag packets.
+ */
+ val = mtk_r32(eth, MTK_CDMQ_IG_CTRL);
+ mtk_w32(eth, val | MTK_CDMQ_STAG_EN, MTK_CDMQ_IG_CTRL);
+
/* Enable RX VLan Offloading */
mtk_w32(eth, 1, MTK_CDMP_EG_CTRL);