From: "Kok, Auke" <redacted>
Date: Fri, 30 Mar 2007 10:27:50 -0700

turns out that NETIF_F_TSO6 is defined even if CONFIG_IPV6 is turned
off, which is what broke e1000. That in itself might be a
problem. Perhaps this should be fixed in netdevice.h (gratuitous bad
inline patch below) but I'm not sure if people would appreciate
this, as it's rather ugly, and it gets all horrible when people
disable TCP protocol support...

No, I don't think we should do this.

We have the vlan acceleration flags available when 802.1Q is
disabled, same situation, and just as valid.