From 6c2c782fa0131a091a52bd0b75083fb24c28b6d3 Mon Sep 17 00:00:00 2001 From: Sergei Antonov Date: Sun, 21 Aug 2022 19:08:44 +0300 Subject: [PATCH] net: ftmac100: set max_mtu to allow DSA overhead setting In case ftmac100 is used with a DSA switch, Linux wants to set MTU to 1504 to accommodate for DSA overhead. With the default max_mtu it leads to the error message: ftmac100 92000000.mac eth0: error -22 setting MTU to 1504 to include DSA overhead ftmac100 supports packet length 1518 (MAX_PKT_SIZE constant), so it is safe to report it in max_mtu. Signed-off-by: Sergei Antonov Reviewed-by: Andrew Lunn Link: https://lore.kernel.org/r/20220821160844.474277-1-saproj@gmail.com Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/faraday/ftmac100.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/ethernet/faraday/ftmac100.c b/drivers/net/ethernet/faraday/ftmac100.c index 8a341e2d58334..2e6524009b192 100644 --- a/drivers/net/ethernet/faraday/ftmac100.c +++ b/drivers/net/ethernet/faraday/ftmac100.c @@ -1075,6 +1075,7 @@ static int ftmac100_probe(struct platform_device *pdev) SET_NETDEV_DEV(netdev, &pdev->dev); netdev->ethtool_ops = &ftmac100_ethtool_ops; netdev->netdev_ops = &ftmac100_netdev_ops; + netdev->max_mtu = MAX_PKT_SIZE; platform_set_drvdata(pdev, netdev); -- 2.30.2