i40e_dma_buffer_t
i40e_dma_buffer_t rcb_dma;
i40e_dma_buffer_t tcb_dma;
i40e_dma_buffer_t rxd_desc_area; /* DMA buffer of rx desc ring */
i40e_dma_buffer_t itrq_desc_area; /* DMA buffer of tx desc ring */
i40e_free_dma_buffer(i40e_dma_buffer_t *dmap)
i40e_alloc_dma_buffer(i40e_t *i40e, i40e_dma_buffer_t *dmap,
i40e_dma_buffer_t *dmap;