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    Subject[PATCH 4.14 032/228] net: ethernet: mtk_eth_soc: fix MTU warnings
    Date
    From: Landen Chao <landen.chao@mediatek.com>

    [ Upstream commit 555a893303872e044fb86f0a5834ce78d41ad2e2 ]

    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 overhead

    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: Landen Chao <landen.chao@mediatek.com>
    Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
    Reviewed-by: Andrew Lunn <andrew@lunn.ch>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/net/ethernet/mediatek/mtk_eth_soc.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
    +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
    @@ -2452,6 +2452,8 @@ static int mtk_add_mac(struct mtk_eth *e
    eth->netdev[id]->irq = eth->irq[0];
    eth->netdev[id]->dev.of_node = np;

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

    free_netdev:

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