AN_RID_BUFFER_SIZE
an_rid_desc.an_len = AN_RID_BUFFER_SIZE;
bzero(sc->an_rid_buffer.an_dma_vaddr, AN_RID_BUFFER_SIZE);
an_dma_malloc(sc, AN_RID_BUFFER_SIZE,
an_rid_desc.an_len = AN_RID_BUFFER_SIZE;