This patchset enables TCP checksum offload support for IPV4 on ibmveth. This completely eliminates the generation and checking of the checksum for packets that are completely virtual and never touch a physical network. A simple TCP_STREAM netperf run on a virtual network with maximum mtu set yielded a ~30% increase in throughput. This feature is enabled by default on systems that support it, but can be disabled with a module option. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: David S. Miller <davem@davemloft.net>