GET_TRILL_OPTS_LEN
optslen = GET_TRILL_OPTS_LEN(trillhdr) * sizeof (uint32_t);
min_size += GET_TRILL_OPTS_LEN(trillhdr) * sizeof (uint32_t) +
(GET_TRILL_OPTS_LEN(trillhdr) * sizeof (uint32_t));