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

[Taekyung Kim <kim.tae.kyung@navercorp.com>]

Hi Andy,

Thanks for your review.

On Wed, Nov 09, 2022 at 02:39:09AM +0000, Pei, Andy wrote:
> 
> 
> > -----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>