DMA_RX_CSUM_IP
hw->rx_cfg |= (DMA_RX_CSUM_TCP | DMA_RX_CSUM_IP);
hw->rx_cfg |= DMA_RX_CSUM_TCP | DMA_RX_CSUM_IP;
hw->rx_cfg &= ~(DMA_RX_CSUM_TCP | DMA_RX_CSUM_IP);