svn commit: r271504 - in head/sys: dev/oce dev/vmware/vmxnet3 dev/xen/netfront net netinet ofed/drivers/net/mlx4

[Robert Watson]

On Sat, 13 Sep 2014, Rick Macklem wrote:

> Well, there are spare fields (if_ispare[4]) in struct ifnet that I believe 
> can be used for new u_ints when MFC'ng a patch that adds fields to struct 
> ifnet in head. (If I have this wrong, someone please correct me.)

In my notes from a few years ago on KBIs, it looked like we could potentially 
convert ifnet from "only use spares" to "OK to append to the structure in a 
stable branch".  It used to be that ifnet was embedded in driver softcs, and 
so ifnet changes broke compiled driver modules, but this is no longer the 
case.  A careful review might suggest to us that it's OK to simply add the new 
fields we want to the end, but need to do that review before assuming it.

Robert