8139cp: Fix GSO MSS handling

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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: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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David Woodhouse 2015-09-24 11:38:22 +01:00 • committed by David S. Miller

parent 5a58f22779

commit 8b7a704822

1 changed files with 18 additions and 2 deletions

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drivers/net/ethernet/realtek/8139cp.c

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