EO_FLOWC_PENDING
cst->flags |= EO_FLOWC_PENDING | EO_SND_TAG_REF;
MPASS((cst->flags & (EO_FLOWC_PENDING | EO_FLOWC_RPL_PENDING)) ==
EO_FLOWC_PENDING);
cst->flags &= ~EO_FLOWC_PENDING;
if (__predict_false(cst->flags & EO_FLOWC_PENDING)) {