if_omcasts
ifp->if_omcasts++;
ifp->if_omcasts = txaccum.vmtxs_omcasts;
IFNET_STAT_GET(ifp, omcasts, ifp->if_omcasts);
ifp->if_omcasts += mcast;
IFNET_STAT_GET(ifp, omcasts, ifp->if_omcasts);