From: Stephen Hemminger <redacted>
Date: Wed, 30 May 2007 14:00:34 -0700

This is better. 
There is still a possiblity when a device allows IPV6 and not IPV4
checksumming, that the checksum will be done in the fixup code in
dev_queue_xmit.

The existing model for checksum offload does not correctly handle
devices that can offload IPV4 and IPV6 only. The NETIF_F_HW_CSUM flag
implies device can do any arbitrary protocol.

This patch:
 * adds NETIF_F_IPV6_CSUM for those devices
 * fixes bnx2 and tg3 devices that need it
 * add NETIF_F_IPV6_CSUM to ipv6 output (incl GSO)
 * fixes assumptions about NETIF_F_ALL_CSUM in nat
 * adjusts bridge union of checksumming computation

I've applied this to net-2.6.23, we can back it out or rework
it if there are problems.

Several of these checksum feature tests are getting out of
hand :-)