8139cp: Fix GSO MSS handling
When fixing the TSO support I noticed we just mask ->gso_size with the MSSMask value and don't care about the consequences. Provide a .ndo_features_check() method which drops the NETIF_F_TSO feature for any skb which would exceed the maximum, and thus forces it to be segmented by software. Then we can stop the masking in cp_start_xmit(), and just WARN if the maximum is exceeded, which should now never happen. Finally, Francois Romieu noticed that we didn't even have the right value for MSSMask anyway; it should be 0x7ff (11 bits) not 0xfff. Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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