GMAC_SW_TX_QUEUE0_PTR_REG
ptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
rwptr_reg = port->dma_base + GMAC_SW_TX_QUEUE0_PTR_REG;
#define GMAC_SW_TX_QUEUE_PTR_REG(i) (GMAC_SW_TX_QUEUE0_PTR_REG + 4 * (i))