Merge branch 'ibmvnic-next'

Thomas Falcon says:

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ibmvnic: Enable SG and TSO feature support

This patch set is fairly straightforward. The first patch enables
scatter-gather support in the ibmvnic driver. The following patch
then enables the TCP Segmentation offload feature. The final patch
allows users to enable or disable net device features using ethtool.

Enabling SG and TSO grants a large increase in throughput with TX
speed increasing from 1Gb/s to 9Gb/s in our initial test runs.
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Signed-off-by: David S. Miller <davem@davemloft.net>