STGE_MAXTXSEGS
bus_dma_segment_t txsegs[STGE_MAXTXSEGS];
m = m_collapse(*m_head, M_NOWAIT, STGE_MAXTXSEGS);
MCLBYTES * STGE_MAXTXSEGS, /* maxsize */
STGE_MAXTXSEGS, /* nsegments */