netdev - [PATCH net] net: ethernet: mtk_eth_soc: enable special tag when any MAC uses DSA

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Date:   Sun,  5 Feb 2023 20:53:31 +0300
From:   arinc9.unal@...il.com
To:     Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Arınç ÜNAL <arinc.unal@...nc9.com>,
        Richard van Schagen <richard@...terhints.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, erkin.bozoglu@...ont.com
Subject: [PATCH net] net: ethernet: mtk_eth_soc: enable special tag when any MAC uses DSA

From: Arınç ÜNAL <arinc.unal@...nc9.com>

The special tag is only enabled when the first MAC uses DSA. However, it
must be enabled when any MAC uses DSA. Change the check accordingly.

This fixes hardware DSA untagging not working on the second MAC of the
MT7621 and MT7623 SoCs, and likely other SoCs too. Therefore, remove the
check that disables hardware DSA untagging for the second MAC of the MT7621
and MT7623 SoCs.

Fixes: a1f47752fd62 ("net: ethernet: mtk_eth_soc: disable hardware DSA untagging for second MAC")
Co-developed-by: Richard van Schagen <richard@...terhints.com>
Signed-off-by: Richard van Schagen <richard@...terhints.com>
Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index f1cb1efc94cf..b5b99f417c86 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -3177,7 +3177,7 @@ static void mtk_gdm_config(struct mtk_eth *eth, u32 config)
 
 		val |= config;
 
-		if (!i && eth->netdev[0] && netdev_uses_dsa(eth->netdev[0]))
+		if (eth->netdev[i] && netdev_uses_dsa(eth->netdev[i]))
 			val |= MTK_GDMA_SPECIAL_TAG;
 
 		mtk_w32(eth, val, MTK_GDMA_FWD_CFG(i));
@@ -3243,8 +3243,7 @@ static int mtk_open(struct net_device *dev)
 	struct mtk_eth *eth = mac->hw;
 	int i, err;
 
-	if ((mtk_uses_dsa(dev) && !eth->prog) &&
-	    !(mac->id == 1 && MTK_HAS_CAPS(eth->soc->caps, MTK_GMAC1_TRGMII))) {
+	if (mtk_uses_dsa(dev) && !eth->prog) {
 		for (i = 0; i < ARRAY_SIZE(eth->dsa_meta); i++) {
 			struct metadata_dst *md_dst = eth->dsa_meta[i];
 
@@ -3261,8 +3260,7 @@ static int mtk_open(struct net_device *dev)
 		}
 	} else {
 		/* Hardware special tag parsing needs to be disabled if at least
-		 * one MAC does not use DSA, or the second MAC of the MT7621 and
-		 * MT7623 SoCs is being used.
+		 * one MAC does not use DSA.
 		 */
 		u32 val = mtk_r32(eth, MTK_CDMP_IG_CTRL);
 		val &= ~MTK_CDMP_STAG_EN;
-- 
2.37.2