BD_MAX_SEND_SIZE
buf_num = (size + BD_MAX_SEND_SIZE - 1) / BD_MAX_SEND_SIZE;
buf_num += (size + BD_MAX_SEND_SIZE - 1) / BD_MAX_SEND_SIZE;
buf_num = (skb->len + BD_MAX_SEND_SIZE - 1) / BD_MAX_SEND_SIZE;
frag_buf_num = (size + BD_MAX_SEND_SIZE - 1) / BD_MAX_SEND_SIZE;
sizeoflast = size % BD_MAX_SEND_SIZE;
sizeoflast = sizeoflast ? sizeoflast : BD_MAX_SEND_SIZE;
sizeoflast : BD_MAX_SEND_SIZE,
dma + BD_MAX_SEND_SIZE * k,