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net: fec: Set max MTU size to allow the MTU to be changed 

The FEC allocates 2K buffers, but looses some of it due to
alignment. It can however support an MTU bigger than the default. This
is particularly interesting when used in combination with Ethernet
switches supporting DSA, which have extra headers. The DSA core will
try to increase the MTU to support these extra headers. If the max
size defaults to that of standard Ethernet we get a warning. By
setting the max to what the driver actually supports, we avoid this
warning.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2020-07-11 22:32:06 +02:00 committed by David S. Miller
parent 2a550aec36
commit 5919305351
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/freescale/fec_main.c
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@ -3678,6 +3678,8 @@ fec_probe(struct platform_device *pdev)
fec_enet_clk_enable(ndev, false);
pinctrl_pm_select_sleep_state(&pdev->dev);
ndev->max_mtu = PKT_MAXBUF_SIZE - ETH_HLEN - ETH_FCS_LEN;
ret = register_netdev(ndev);
if (ret)
goto failed_register;