M_HASFCB
| ((m->m_flags & M_HASFCB) ? TXBD_TOE : 0);
m->m_flags &= ~M_HASFCB;
m->m_flags &= ~M_HASFCB;
m->m_flags &= ~M_HASFCB;
m->m_flags |= M_HASFCB;
if (m->m_flags & M_HASFCB)