From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Fri, 8 Nov 2013 05:31:11 +0800

Sorry David, I just realised that this patch doesn't address
this problem fully.  While we can stop the generation of these
packets in our own stack, if they're coming from the virt host
or another guest, there is nothing we can do to stop them.

So given virtio_net is now generating such packets, our choices
are either to linearise them or deal with them properly in skb_segment.

Ok.

Aside from the segmentation issues, Eric's patch was a nice cleanup
which also made it such that we'd be able to get features back when
the blocking condition gets removed.

Given all of this, would you like me to revert his change for now?