ibmveth: Fix max MTU limit
[ Upstream commit5.4-rM2-2.2.x-imx-squashed5948378b26
] The max MTU limit defined for ibmveth is not accounting for virtual ethernet buffer overhead, which is twenty-two additional bytes set aside for the ethernet header and eight additional bytes of an opaque handle reserved for use by the hypervisor. Update the max MTU to reflect this overhead. Fixes:d894be57ca
("ethernet: use net core MTU range checking in more drivers") Fixes:110447f826
("ethernet: fix min/max MTU typos") Signed-off-by: Thomas Falcon <tlfalcon@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1682,7 +1682,7 @@ static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
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}
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netdev->min_mtu = IBMVETH_MIN_MTU;
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netdev->max_mtu = ETH_MAX_MTU;
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netdev->max_mtu = ETH_MAX_MTU - IBMVETH_BUFF_OH;
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memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
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