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From: Bruce Richardson <bruce.richardson@intel.com>
To: Chengwen Feng <fengchengwen@huawei.com>
Cc: <thomas@monjalon.net>, <dev@dpdk.org>, <kevin.laatz@intel.com>
Subject: Re: [PATCH v2] examples/dma: support DMA dequeue when no packet received
Date: Mon, 25 Jul 2022 13:48:02 +0100	[thread overview]
Message-ID: <Yt6RApVZEbEiXOtB@bricha3-MOBL.ger.corp.intel.com> (raw)
In-Reply-To: <20220725122200.47851-1-fengchengwen@huawei.com>

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 <fengchengwen@huawei.com>

Acked-by: Bruce Richardson <bruce.richardson@intel.com>

  reply	other threads:[~2022-07-25 12:48 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-25 12:22 Chengwen Feng
2022-07-25 12:48 ` Bruce Richardson [this message]
2022-10-03 16:21   ` Thomas Monjalon
2022-07-26  8:49 ` Kevin Laatz
2022-09-13  1:44 ` fengchengwen

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