netdev - [PATCH] net: ethernet: mtk_eth_soc: fix state in __mtk_foe_entry

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Date:   Wed, 28 Sep 2022 02:25:15 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org,
        Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     Sujuan Chen <sujuan.chen@...iatek.com>,
        Bo Jiao <Bo.Jiao@...iatek.com>, Felix Fietkau <nbd@....name>,
        John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        "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>,
        Chen Minqiang <ptpt52@...il.com>,
        Thomas Hühn <thomas.huehn@...nordhausen.de>
Subject: [PATCH] net: ethernet: mtk_eth_soc: fix state in
 __mtk_foe_entry_clear

Setting ib1 state to MTK_FOE_STATE_UNBIND in __mtk_foe_entry_clear
routine as done by commit 0e80707d94e4c8 ("net: ethernet: mtk_eth_soc:
fix typo in __mtk_foe_entry_clear") breaks flow offloading, at least
on older MTK_NETSYS_V1 SoCs; OpenWrt users have confirmed the bug on
MT7622 and MT7621 systems.
Felix Fietkau suggested to use MTK_FOE_STATE_INVALID instead which
works well on both, MTK_NETSYS_V1 and MTK_NETSYS_V2.

Tested on MT7622 (Linksys E8450) and MT7986 (BananaPi BPI-R3).

Suggested-by: Felix Fietkau <nbd@....name>
Fixes: 0e80707d94e4c8 ("net: ethernet: mtk_eth_soc: fix typo in __mtk_foe_entry_clear")
Fixes: 33fc42de33278 ("net: ethernet: mtk_eth_soc: support creating mac address based offload entries")
Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/net/ethernet/mediatek/mtk_ppe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.c b/drivers/net/ethernet/mediatek/mtk_ppe.c
index 887f430734f747..ae00e572390d7b 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
@@ -442,7 +442,7 @@ __mtk_foe_entry_clear(struct mtk_ppe *ppe, struct mtk_flow_entry *entry)
 		struct mtk_foe_entry *hwe = mtk_foe_get_entry(ppe, entry->hash);
 
 		hwe->ib1 &= ~MTK_FOE_IB1_STATE;
-		hwe->ib1 |= FIELD_PREP(MTK_FOE_IB1_STATE, MTK_FOE_STATE_UNBIND);
+		hwe->ib1 |= FIELD_PREP(MTK_FOE_IB1_STATE, MTK_FOE_STATE_INVALID);
 		dma_wmb();
 	}
 	entry->hash = 0xffff;
-- 
2.37.3