correct calculation of last_rid
Use a sleep instead of a busy-wait
Move SR-IOV ARI enable back to pci_iov.c.  There is no guarantee that
the first function has a SR-IOV capability.
checkpoint ixgbe SR-IOV work
checkpoint ixgbe work
Implement PF side of ixgbe PF/VF mailbox

ixgbe: Implement PF handling of mailbox messages from VFs.  With
this ixgbevf can come up and pass traffic (with some major
caveats that will be addressed)
Attempt to restore SR-IOV config on a re-init of the PF