IWN_MAX_SCATTER
IWN_MAX_SCATTER - 1, MCLBYTES, 0, NULL, NULL, &ring->data_dmat);
bus_dma_segment_t *seg, segs[IWN_MAX_SCATTER];
m1 = m_collapse(m, M_NOWAIT, IWN_MAX_SCATTER - 1);
} __packed segs[IWN_MAX_SCATTER];