MVS_SG_ENTRIES
KASSERT(nsegs <= MVS_SG_ENTRIES, ("too many DMA segment entries\n"));
MVS_SG_ENTRIES * PAGE_SIZE, MVS_SG_ENTRIES, MVS_EPRD_MAX,
#define MVS_EPRD_SIZE (MVS_SG_ENTRIES * 16) /* sizeof(struct mvs_eprd) */