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Subject: Re: [PATCH v2 6/6] test/dmadev: add tests for stopping and restarting
dev
To: Bruce Richardson <bruce.richardson@intel.com>, <dev@dpdk.org>
CC: Kevin Laatz <kevin.laatz@intel.com>
References: <20230116153714.554470-1-bruce.richardson@intel.com>
<20230116173738.562322-1-bruce.richardson@intel.com>
<20230116173738.562322-7-bruce.richardson@intel.com>
From: fengchengwen <fengchengwen@huawei.com>
Message-ID: <c85b8031-4735-7c40-c439-386abcf19014@huawei.com>
Date: Wed, 15 Feb 2023 09:59:06 +0800
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On 2023/1/17 1:37, Bruce Richardson wrote:
> Validate device operation when a device is stopped or restarted.
>
> The only complication - and gap in the dmadev ABI specification - is
> what happens to the job ids on restart. Some drivers reset them to 0,
> while others continue where things left off. Take account of both
> possibilities in the test case.
>
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> ---
> app/test/test_dmadev.c | 46 ++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 46 insertions(+)
>
> diff --git a/app/test/test_dmadev.c b/app/test/test_dmadev.c
> index de787c14e2..8fb73a41e2 100644
> --- a/app/test/test_dmadev.c
> +++ b/app/test/test_dmadev.c
> @@ -304,6 +304,48 @@ test_enqueue_copies(int16_t dev_id, uint16_t vchan)
> || do_multi_copies(dev_id, vchan, 0, 0, 1);
> }
>
> +static int
> +test_stop_start(int16_t dev_id, uint16_t vchan)
> +{
> + /* device is already started on input, should be (re)started on output */
> +
> + uint16_t id = 0;
> + enum rte_dma_status_code status = RTE_DMA_STATUS_SUCCESSFUL;
> +
> + /* - test stopping a device works ok,
> + * - then do a start-stop without doing a copy
> + * - finally restart the device
> + * checking for errors at each stage, and validating we can still copy at the end.
> + */
> + if (rte_dma_stop(dev_id) < 0)
> + ERR_RETURN("Error stopping device\n");
> +
> + if (rte_dma_start(dev_id) < 0)
> + ERR_RETURN("Error restarting device\n");
> + if (rte_dma_stop(dev_id) < 0)
> + ERR_RETURN("Error stopping device after restart (no jobs executed)\n");
> +
> + if (rte_dma_start(dev_id) < 0)
> + ERR_RETURN("Error restarting device after multiple stop-starts\n");
> +
> + /* before doing a copy, we need to know what the next id will be it should
> + * either be:
> + * - the last completed job before start if driver does not reset id on stop
> + * - or -1 i.e. next job is 0, if driver does reset the job ids on stop
> + */
> + if (rte_dma_completed_status(dev_id, vchan, 1, &id, &status) != 0)
> + ERR_RETURN("Error with rte_dma_completed_status when no job done\n");
> + id += 1; /* id_count is next job id */
> + if (id != id_count && id != 0)
> + ERR_RETURN("Unexpected next id from device after stop-start. Got %u, expected %u or 0\n",
> + id, id_count);
Hi Bruce,
Suggest add a warn LOG to identify the id was not reset zero.
So that new driver could detect break ABI specification.
Thanks.