[dpdk-dev] [PATCH v10 08/16] dma/idxd: add start and stop functions for pci devices

[fengchengwen]

On 2021/10/19 22:10, Kevin Laatz wrote:
> Add device start/stop functions for DSA devices bound to vfio. For devices
> bound to the IDXD kernel driver, these are not required since the IDXD
> kernel driver takes care of this.
> 
> Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
> Signed-off-by: Kevin Laatz <kevin.laatz at intel.com>
> Reviewed-by: Conor Walsh <conor.walsh at intel.com>
> ---

[snip]

>  
> +static int
> +idxd_pci_dev_stop(struct rte_dma_dev *dev)
> +{
> +	struct idxd_dmadev *idxd = dev->fp_obj->dev_private;
> +	uint8_t err_code;
> +
> +	if (!idxd_is_wq_enabled(idxd)) {
> +		IDXD_PMD_ERR("Work queue %d already disabled", idxd->qid);
> +		return -EALREADY;

suggest return 0.

> +	}
> +
> +	err_code = idxd_pci_dev_command(idxd, idxd_disable_wq);
> +	if (err_code || idxd_is_wq_enabled(idxd)) {
> +		IDXD_PMD_ERR("Failed disabling work queue %d, error code: %#x",
> +				idxd->qid, err_code);
> +		return err_code == 0 ? -1 : -err_code;
> +	}
> +	IDXD_PMD_DEBUG("Work queue %d disabled OK", idxd->qid);
> +
> +	return 0;
> +}
> +
> +static int
> +idxd_pci_dev_start(struct rte_dma_dev *dev)
> +{
> +	struct idxd_dmadev *idxd = dev->fp_obj->dev_private;
> +	uint8_t err_code;
> +
> +	if (idxd_is_wq_enabled(idxd)) {
> +		IDXD_PMD_WARN("WQ %d already enabled", idxd->qid);
> +		return 0;
> +	}
> +
> +	if (idxd->desc_ring == NULL) {
> +		IDXD_PMD_ERR("WQ %d has not been fully configured", idxd->qid);
> +		return -EINVAL;
> +	}
> +
> +	err_code = idxd_pci_dev_command(idxd, idxd_enable_wq);
> +	if (err_code || !idxd_is_wq_enabled(idxd)) {
> +		IDXD_PMD_ERR("Failed enabling work queue %d, error code: %#x",
> +				idxd->qid, err_code);
> +		return err_code == 0 ? -1 : -err_code;
> +	}
> +	IDXD_PMD_DEBUG("Work queue %d enabled OK", idxd->qid);
> +
> +	return 0;
> +}
> +
>  static int
>  idxd_pci_dev_close(struct rte_dma_dev *dev)
>  {
> @@ -87,6 +136,8 @@ static const struct rte_dma_dev_ops idxd_pci_ops = {
>  	.dev_configure = idxd_configure,
>  	.vchan_setup = idxd_vchan_setup,
>  	.dev_info_get = idxd_info_get,
> +	.dev_start = idxd_pci_dev_start,
> +	.dev_stop = idxd_pci_dev_stop,
>  };
>  
>  /* each portal uses 4 x 4k pages */
>