RE: [PATCH v4] vdpa/ifc: fix update_datapath error handling

["Pei, Andy" <andy.pei@intel.com>]

> -----Original Message-----
> From: Taekyung Kim <kim.tae.kyung@navercorp.com>
> Sent: Tuesday, November 8, 2022 4:56 PM
> To: dev@dpdk.org
> Cc: Xia, Chenbo <Chenbo.Xia@intel.com>; Pei, Andy <andy.pei@intel.com>;
> kim.tae.kyung@navercorp.com; maxime.coquelin@redhat.com;
> stable@dpdk.org; Wang, Xiao W <xiao.w.wang@intel.com>
> Subject: [PATCH v4] vdpa/ifc: fix update_datapath error handling
> 
> Stop and return the error code when update_datapath fails.
> update_datapath prepares resources for the vdpa device.
> The driver should not perform any further actions if update_datapath returns an
> error.
> 
> Fixes: a3f8150eac6d ("net/ifcvf: add ifcvf vDPA driver")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Taekyung Kim <kim.tae.kyung@navercorp.com>
> ---
> v4:
> * Add rte_vdpa_unregister_device in ifcvf_pci_probe
> 
> v3:
> * Fix coding style
> 
> v2:
> * Revert the prepared resources before returning an error
> * Rebase to 22.11 rc2
> * Add fixes and cc for backport
> 
> ---
>  drivers/vdpa/ifc/ifcvf_vdpa.c | 27 +++++++++++++++++++++++----
>  1 file changed, 23 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/vdpa/ifc/ifcvf_vdpa.c b/drivers/vdpa/ifc/ifcvf_vdpa.c index
> 8dfd49336e..49d68ad1b1 100644
> --- a/drivers/vdpa/ifc/ifcvf_vdpa.c
> +++ b/drivers/vdpa/ifc/ifcvf_vdpa.c
> @@ -1098,7 +1098,12 @@ ifcvf_dev_config(int vid)
>  	internal = list->internal;
>  	internal->vid = vid;
>  	rte_atomic32_set(&internal->dev_attached, 1);
> -	update_datapath(internal);
> +	if (update_datapath(internal) < 0) {
> +		DRV_LOG(ERR, "failed to update datapath for vDPA device %s",
> +			vdev->device->name);
> +		rte_atomic32_set(&internal->dev_attached, 0);
> +		return -1;
> +	}
> 
>  	hw = &internal->hw;
>  	for (i = 0; i < hw->nr_vring; i++) {
> @@ -1146,7 +1151,12 @@ ifcvf_dev_close(int vid)
>  		internal->sw_fallback_running = false;
>  	} else {
>  		rte_atomic32_set(&internal->dev_attached, 0);
> -		update_datapath(internal);
> +		if (update_datapath(internal) < 0) {
> +			DRV_LOG(ERR, "failed to update datapath for vDPA
> device %s",
> +				vdev->device->name);
> +			internal->configured = 0;
> +			return -1;
> +		}
>  	}
> 
>  	internal->configured = 0;
> @@ -1752,7 +1762,15 @@ ifcvf_pci_probe(struct rte_pci_driver *pci_drv
> __rte_unused,
>  	}
> 
>  	rte_atomic32_set(&internal->started, 1);
> -	update_datapath(internal);
> +	if (update_datapath(internal) < 0) {
> +		DRV_LOG(ERR, "failed to update datapath %s", pci_dev->name);
> +		rte_atomic32_set(&internal->started, 0);
> +		rte_vdpa_unregister_device(internal->vdev);
> +		pthread_mutex_lock(&internal_list_lock);
> +		TAILQ_REMOVE(&internal_list, list, next);
> +		pthread_mutex_unlock(&internal_list_lock);
> +		goto error;
> +	}
> 
>  	rte_kvargs_free(kvlist);
>  	return 0;
> @@ -1781,7 +1799,8 @@ ifcvf_pci_remove(struct rte_pci_device *pci_dev)
> 
>  	internal = list->internal;
>  	rte_atomic32_set(&internal->started, 0);
> -	update_datapath(internal);
> +	if (update_datapath(internal) < 0)
> +		DRV_LOG(ERR, "failed to update datapath %s", pci_dev->name);
> 
>  	rte_pci_unmap_device(internal->pdev);
>  	rte_vfio_container_destroy(internal->vfio_container_fd);
> --
> 2.34.1

Acked-by: Andy Pei <andy.pei@intel.com>