dtrace_dropkind_t
dtrace_dropkind_t dtdrg_kind;
dt_droptag(dtrace_dropkind_t kind)
dtrace_dropkind_t what, uint64_t howmany)
dtrace_dropkind_t dtdrt_kind;
dtrace_dropkind_t, uint64_t);
dtrace_dropkind_t dtdda_kind; /* kind of drop */