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From:   Frank Wunderlich <frank-w@public-files.de>
To:     linux-mediatek@lists.infradead.org
Cc:     Landen Chao <landen.chao@mediatek.com>,
        Felix Fietkau <nbd@nbd.name>, John Crispin <john@phrozen.org>,
        Sean Wang <sean.wang@mediatek.com>,
        Mark Lee <Mark-MC.Lee@mediatek.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org,
        =?UTF-8?q?Ren=C3=A9=20van=20Dorst?= <opensource@vdorst.com>,
        Frank Wunderlich <frank-w@public-files.de>
Subject: [PATCH v3] net: ethernet: mtk_eth_soc: fix mtu warning
Date:   Tue, 28 Jul 2020 14:27:43 +0200
Message-Id: <20200728122743.78489-1-frank-w@public-files.de>
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From: Landen Chao <landen.chao@mediatek.com>

in recent Kernel-Versions there are warnings about incorrect MTU-Size
like these:

eth0: mtu greater than device maximum
mtk_soc_eth 1b100000.ethernet eth0: error -22 setting MTU to include DSA o=
verhead

Fixes: bfcb813203e6 ("net: dsa: configure the MTU for switch ports")
Fixes: 72579e14a1d3 ("net: dsa: don't fail to probe if we couldn't set the=
 MTU")
Fixes: 7a4c53bee332 ("net: report invalid mtu value via netlink extack")
Signed-off-by: Ren=C3=A9 van Dorst <opensource@vdorst.com>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
=2D--
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/eth=
ernet/mediatek/mtk_eth_soc.c
index 85735d32ecb0..a1c45b39a230 100644
=2D-- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -2891,6 +2891,8 @@ static int mtk_add_mac(struct mtk_eth *eth, struct d=
evice_node *np)
 	eth->netdev[id]->irq =3D eth->irq[0];
 	eth->netdev[id]->dev.of_node =3D np;

+	eth->netdev[id]->max_mtu =3D MTK_MAX_RX_LENGTH - MTK_RX_ETH_HLEN;
+
 	return 0;

 free_netdev:
=2D-
2.25.1