GMAC_DMA_CHAN0_CONTROL_DSL_SHIFT
val |= ((DESC_ALIGN - 16) / 8) << GMAC_DMA_CHAN0_CONTROL_DSL_SHIFT;
#define GMAC_DMA_CHAN0_CONTROL_DSL_MASK (0x7U << GMAC_DMA_CHAN0_CONTROL_DSL_SHIFT)