On Mon, Jul 25, 2022 at 08:22:00PM +0800, Chengwen Feng wrote: > Currently the example using DMA in asynchronous mode, which are: > nb_rx = rte_eth_rx_burst(); > if (nb_rx == 0) > continue; > ... > dma_enqueue(); // enqueue the received packets copy request > nb_cpl = dma_dequeue(); // get copy completed packets > ... > > There are no waiting inside dma_dequeue(), and this is why it's called > asynchronus. If there are no packet received, it won't call > dma_dequeue(), but some packets may still in the DMA queue which > enqueued in last cycle. As a result, when the traffic is stopped, the > sent packets and received packets are unbalanced from the perspective > of the traffic generator. > > The patch supports DMA dequeue when no packet received, it helps to > judge the test result by comparing the sent packets with the received > packets on traffic generator sides. > > Signed-off-by: Chengwen Feng <fengcheng...@huawei.com>
Acked-by: Bruce Richardson <bruce.richard...@intel.com>
