mei_data2slots
vtag_hdr->hdr.length = mei_data2slots(sizeof(*vtag_hdr));
slots = mei_data2slots(len);
slots = mei_data2slots(len);
dw_cnt = mei_data2slots(hdr_len + data_len);
dw_cnt = mei_data2slots(hdr_len + data_len);
length = mei_hdr->extension[mei_data2slots(ext_len)];