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net: ftmac100: set max_mtu to allow DSA overhead setting

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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 <saproj@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20220821160844.474277-1-saproj@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Sergei Antonov 2022-08-21 19:08:44 +03:00 committed by Jakub Kicinski
parent 52412f5543
commit 6c2c782fa0
1 changed files with 1 additions and 0 deletions
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drivers/net/ethernet/faraday/ftmac100.c
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@ -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);