net: ethernet: octeon_mgmt: Account for second possible VLAN header
Octeon's input ring-buffer entry has 14 bits-wide size field, so to account for second possible VLAN header max_mtu must be further reduced. Fixes: 109cc165 ("ethernet/cavium: use core min/max MTU checking") Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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