Hi
     thank you for reading this email!
     In dpdk offical website:  https://doc.dpdk.org/guides/sample_app_ug/dma.html
     There may be a quotation of code that dosen't match the introduction in "13.4.3. The Lcores Processing Functions".
    It's suppose to be the code of rte_eth_rx_burst() after the second paragraph; 
    I hope this is helpful!