[PATCH net v6] virtio_net: Fix error unwinding of XDP initialization

[PATCH net v6] virtio_net: Fix error unwinding of XDP initialization

[Feng Liu]

When initializing XDP in virtnet_open(), some rq xdp initialization
may hit an error causing net device open failed. However, previous
rqs have already initialized XDP and enabled NAPI, which is not the
expected behavior. Need to roll back the previous rq initialization
to avoid leaks in error unwinding of init code.

Also extract helper functions of disable and enable queue pairs.
Use newly introduced disable helper function in error unwinding and
virtnet_close. Use enable helper function in virtnet_open.

Fixes: 754b8a21a96d ("virtio_net: setup xdp_rxq_info")
Signed-off-by: Feng Liu <feliu@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: William Tu <witu@nvidia.com>
---
v5 -> v6
feedbacks from Xuan Zhuo
- add disable_delayed_refill and cancel_delayed_work_sync

v4 -> v5
feedbacks from Michael S. Tsirkin
- rename helper as virtnet_disable_queue_pair
- rename helper as virtnet_enable_queue_pair

v3 -> v4
feedbacks from Jiri Pirko
- Add symmetric helper function virtnet_enable_qp to enable queues.
- Error handle:  cleanup current queue pair in virtnet_enable_qp,
  and complete the reset queue pairs cleanup in virtnet_open.
- Fix coding style.
feedbacks from Parav Pandit
- Remove redundant debug message and white space.

v2 -> v3
feedbacks from Michael S. Tsirkin
- Remove redundant comment.

v1 -> v2
feedbacks from Michael S. Tsirkin
- squash two patches together.

---
 drivers/net/virtio_net.c | 61 +++++++++++++++++++++++++++++-----------
 1 file changed, 44 insertions(+), 17 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index a12ae26db0e2..56ca1d270304 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1868,6 +1868,38 @@ static int virtnet_poll(struct napi_struct *napi, int budget)
 	return received;
 }
 
+static void virtnet_disable_queue_pair(struct virtnet_info *vi, int qp_index)
+{
+	virtnet_napi_tx_disable(&vi->sq[qp_index].napi);
+	napi_disable(&vi->rq[qp_index].napi);
+	xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
+}
+
+static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index)
+{
+	struct net_device *dev = vi->dev;
+	int err;
+
+	err = xdp_rxq_info_reg(&vi->rq[qp_index].xdp_rxq, dev, qp_index,
+			       vi->rq[qp_index].napi.napi_id);
+	if (err < 0)
+		return err;
+
+	err = xdp_rxq_info_reg_mem_model(&vi->rq[qp_index].xdp_rxq,
+					 MEM_TYPE_PAGE_SHARED, NULL);
+	if (err < 0)
+		goto err_xdp_reg_mem_model;
+
+	virtnet_napi_enable(vi->rq[qp_index].vq, &vi->rq[qp_index].napi);
+	virtnet_napi_tx_enable(vi, vi->sq[qp_index].vq, &vi->sq[qp_index].napi);
+
+	return 0;
+
+err_xdp_reg_mem_model:
+	xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
+	return err;
+}
+
 static int virtnet_open(struct net_device *dev)
 {
 	struct virtnet_info *vi = netdev_priv(dev);
@@ -1881,22 +1913,20 @@ static int virtnet_open(struct net_device *dev)
 			if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
 				schedule_delayed_work(&vi->refill, 0);
 
-		err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i, vi->rq[i].napi.napi_id);
+		err = virtnet_enable_queue_pair(vi, i);
 		if (err < 0)
-			return err;
-
-		err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq,
-						 MEM_TYPE_PAGE_SHARED, NULL);
-		if (err < 0) {
-			xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
-			return err;
-		}
-
-		virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
-		virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi);
+			goto err_enable_qp;
 	}
 
 	return 0;
+
+err_enable_qp:
+	disable_delayed_refill(vi);
+	cancel_delayed_work_sync(&vi->refill);
+
+	for (i--; i >= 0; i--)
+		virtnet_disable_queue_pair(vi, i);
+	return err;
 }
 
 static int virtnet_poll_tx(struct napi_struct *napi, int budget)
@@ -2305,11 +2335,8 @@ static int virtnet_close(struct net_device *dev)
 	/* Make sure refill_work doesn't re-enable napi! */
 	cancel_delayed_work_sync(&vi->refill);
 
-	for (i = 0; i < vi->max_queue_pairs; i++) {
-		virtnet_napi_tx_disable(&vi->sq[i].napi);
-		napi_disable(&vi->rq[i].napi);
-		xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
-	}
+	for (i = 0; i < vi->max_queue_pairs; i++)
+		virtnet_disable_queue_pair(vi, i);
 
 	return 0;
 }
-- 
2.37.1 (Apple Git-137.1)

Re: [PATCH net v6] virtio_net: Fix error unwinding of XDP initialization

[Michael S. Tsirkin]

On Fri, May 12, 2023 at 11:18:12AM -0400, Feng Liu wrote:
> When initializing XDP in virtnet_open(), some rq xdp initialization
> may hit an error causing net device open failed. However, previous
> rqs have already initialized XDP and enabled NAPI, which is not the
> expected behavior. Need to roll back the previous rq initialization
> to avoid leaks in error unwinding of init code.
> 
> Also extract helper functions of disable and enable queue pairs.
> Use newly introduced disable helper function in error unwinding and
> virtnet_close. Use enable helper function in virtnet_open.
> 
> Fixes: 754b8a21a96d ("virtio_net: setup xdp_rxq_info")
> Signed-off-by: Feng Liu <feliu@nvidia.com>
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> Reviewed-by: William Tu <witu@nvidia.com>

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
> v5 -> v6
> feedbacks from Xuan Zhuo
> - add disable_delayed_refill and cancel_delayed_work_sync
> 
> v4 -> v5
> feedbacks from Michael S. Tsirkin
> - rename helper as virtnet_disable_queue_pair
> - rename helper as virtnet_enable_queue_pair
> 
> v3 -> v4
> feedbacks from Jiri Pirko
> - Add symmetric helper function virtnet_enable_qp to enable queues.
> - Error handle:  cleanup current queue pair in virtnet_enable_qp,
>   and complete the reset queue pairs cleanup in virtnet_open.
> - Fix coding style.
> feedbacks from Parav Pandit
> - Remove redundant debug message and white space.
> 
> v2 -> v3
> feedbacks from Michael S. Tsirkin
> - Remove redundant comment.
> 
> v1 -> v2
> feedbacks from Michael S. Tsirkin
> - squash two patches together.
> 
> ---
>  drivers/net/virtio_net.c | 61 +++++++++++++++++++++++++++++-----------
>  1 file changed, 44 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index a12ae26db0e2..56ca1d270304 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1868,6 +1868,38 @@ static int virtnet_poll(struct napi_struct *napi, int budget)
>  	return received;
>  }
>  
> +static void virtnet_disable_queue_pair(struct virtnet_info *vi, int qp_index)
> +{
> +	virtnet_napi_tx_disable(&vi->sq[qp_index].napi);
> +	napi_disable(&vi->rq[qp_index].napi);
> +	xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
> +}
> +
> +static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index)
> +{
> +	struct net_device *dev = vi->dev;
> +	int err;
> +
> +	err = xdp_rxq_info_reg(&vi->rq[qp_index].xdp_rxq, dev, qp_index,
> +			       vi->rq[qp_index].napi.napi_id);
> +	if (err < 0)
> +		return err;
> +
> +	err = xdp_rxq_info_reg_mem_model(&vi->rq[qp_index].xdp_rxq,
> +					 MEM_TYPE_PAGE_SHARED, NULL);
> +	if (err < 0)
> +		goto err_xdp_reg_mem_model;
> +
> +	virtnet_napi_enable(vi->rq[qp_index].vq, &vi->rq[qp_index].napi);
> +	virtnet_napi_tx_enable(vi, vi->sq[qp_index].vq, &vi->sq[qp_index].napi);
> +
> +	return 0;
> +
> +err_xdp_reg_mem_model:
> +	xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
> +	return err;
> +}
> +
>  static int virtnet_open(struct net_device *dev)
>  {
>  	struct virtnet_info *vi = netdev_priv(dev);
> @@ -1881,22 +1913,20 @@ static int virtnet_open(struct net_device *dev)
>  			if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
>  				schedule_delayed_work(&vi->refill, 0);
>  
> -		err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i, vi->rq[i].napi.napi_id);
> +		err = virtnet_enable_queue_pair(vi, i);
>  		if (err < 0)
> -			return err;
> -
> -		err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq,
> -						 MEM_TYPE_PAGE_SHARED, NULL);
> -		if (err < 0) {
> -			xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
> -			return err;
> -		}
> -
> -		virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
> -		virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi);
> +			goto err_enable_qp;
>  	}
>  
>  	return 0;
> +
> +err_enable_qp:
> +	disable_delayed_refill(vi);
> +	cancel_delayed_work_sync(&vi->refill);
> +
> +	for (i--; i >= 0; i--)
> +		virtnet_disable_queue_pair(vi, i);
> +	return err;
>  }
>  
>  static int virtnet_poll_tx(struct napi_struct *napi, int budget)
> @@ -2305,11 +2335,8 @@ static int virtnet_close(struct net_device *dev)
>  	/* Make sure refill_work doesn't re-enable napi! */
>  	cancel_delayed_work_sync(&vi->refill);
>  
> -	for (i = 0; i < vi->max_queue_pairs; i++) {
> -		virtnet_napi_tx_disable(&vi->sq[i].napi);
> -		napi_disable(&vi->rq[i].napi);
> -		xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
> -	}
> +	for (i = 0; i < vi->max_queue_pairs; i++)
> +		virtnet_disable_queue_pair(vi, i);
>  
>  	return 0;
>  }
> -- 
> 2.37.1 (Apple Git-137.1)

Re: [PATCH net v6] virtio_net: Fix error unwinding of XDP initialization

[Jason Wang]

On Fri, May 12, 2023 at 11:18 PM Feng Liu <feliu@nvidia.com> wrote:
>
> When initializing XDP in virtnet_open(), some rq xdp initialization
> may hit an error causing net device open failed. However, previous
> rqs have already initialized XDP and enabled NAPI, which is not the
> expected behavior. Need to roll back the previous rq initialization
> to avoid leaks in error unwinding of init code.
>
> Also extract helper functions of disable and enable queue pairs.
> Use newly introduced disable helper function in error unwinding and
> virtnet_close. Use enable helper function in virtnet_open.
>
> Fixes: 754b8a21a96d ("virtio_net: setup xdp_rxq_info")
> Signed-off-by: Feng Liu <feliu@nvidia.com>
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> Reviewed-by: William Tu <witu@nvidia.com>

Acked-by: Jason Wang <jasowang@redhat.com>

Thanks

> ---
> v5 -> v6
> feedbacks from Xuan Zhuo
> - add disable_delayed_refill and cancel_delayed_work_sync
>
> v4 -> v5
> feedbacks from Michael S. Tsirkin
> - rename helper as virtnet_disable_queue_pair
> - rename helper as virtnet_enable_queue_pair
>
> v3 -> v4
> feedbacks from Jiri Pirko
> - Add symmetric helper function virtnet_enable_qp to enable queues.
> - Error handle:  cleanup current queue pair in virtnet_enable_qp,
>   and complete the reset queue pairs cleanup in virtnet_open.
> - Fix coding style.
> feedbacks from Parav Pandit
> - Remove redundant debug message and white space.
>
> v2 -> v3
> feedbacks from Michael S. Tsirkin
> - Remove redundant comment.
>
> v1 -> v2
> feedbacks from Michael S. Tsirkin
> - squash two patches together.
>
> ---
>  drivers/net/virtio_net.c | 61 +++++++++++++++++++++++++++++-----------
>  1 file changed, 44 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index a12ae26db0e2..56ca1d270304 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1868,6 +1868,38 @@ static int virtnet_poll(struct napi_struct *napi, int budget)
>         return received;
>  }
>
> +static void virtnet_disable_queue_pair(struct virtnet_info *vi, int qp_index)
> +{
> +       virtnet_napi_tx_disable(&vi->sq[qp_index].napi);
> +       napi_disable(&vi->rq[qp_index].napi);
> +       xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
> +}
> +
> +static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index)
> +{
> +       struct net_device *dev = vi->dev;
> +       int err;
> +
> +       err = xdp_rxq_info_reg(&vi->rq[qp_index].xdp_rxq, dev, qp_index,
> +                              vi->rq[qp_index].napi.napi_id);
> +       if (err < 0)
> +               return err;
> +
> +       err = xdp_rxq_info_reg_mem_model(&vi->rq[qp_index].xdp_rxq,
> +                                        MEM_TYPE_PAGE_SHARED, NULL);
> +       if (err < 0)
> +               goto err_xdp_reg_mem_model;
> +
> +       virtnet_napi_enable(vi->rq[qp_index].vq, &vi->rq[qp_index].napi);
> +       virtnet_napi_tx_enable(vi, vi->sq[qp_index].vq, &vi->sq[qp_index].napi);
> +
> +       return 0;
> +
> +err_xdp_reg_mem_model:
> +       xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
> +       return err;
> +}
> +
>  static int virtnet_open(struct net_device *dev)
>  {
>         struct virtnet_info *vi = netdev_priv(dev);
> @@ -1881,22 +1913,20 @@ static int virtnet_open(struct net_device *dev)
>                         if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
>                                 schedule_delayed_work(&vi->refill, 0);
>
> -               err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i, vi->rq[i].napi.napi_id);
> +               err = virtnet_enable_queue_pair(vi, i);
>                 if (err < 0)
> -                       return err;
> -
> -               err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq,
> -                                                MEM_TYPE_PAGE_SHARED, NULL);
> -               if (err < 0) {
> -                       xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
> -                       return err;
> -               }
> -
> -               virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
> -               virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi);
> +                       goto err_enable_qp;
>         }
>
>         return 0;
> +
> +err_enable_qp:
> +       disable_delayed_refill(vi);
> +       cancel_delayed_work_sync(&vi->refill);
> +
> +       for (i--; i >= 0; i--)
> +               virtnet_disable_queue_pair(vi, i);
> +       return err;
>  }
>
>  static int virtnet_poll_tx(struct napi_struct *napi, int budget)
> @@ -2305,11 +2335,8 @@ static int virtnet_close(struct net_device *dev)
>         /* Make sure refill_work doesn't re-enable napi! */
>         cancel_delayed_work_sync(&vi->refill);
>
> -       for (i = 0; i < vi->max_queue_pairs; i++) {
> -               virtnet_napi_tx_disable(&vi->sq[i].napi);
> -               napi_disable(&vi->rq[i].napi);
> -               xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
> -       }
> +       for (i = 0; i < vi->max_queue_pairs; i++)
> +               virtnet_disable_queue_pair(vi, i);
>
>         return 0;
>  }
> --
> 2.37.1 (Apple Git-137.1)
>

Re: [PATCH net v6] virtio_net: Fix error unwinding of XDP initialization

[Xuan Zhuo]

On Fri, 12 May 2023 11:18:12 -0400, Feng Liu <feliu@nvidia.com> wrote:
> When initializing XDP in virtnet_open(), some rq xdp initialization
> may hit an error causing net device open failed. However, previous
> rqs have already initialized XDP and enabled NAPI, which is not the
> expected behavior. Need to roll back the previous rq initialization
> to avoid leaks in error unwinding of init code.
>
> Also extract helper functions of disable and enable queue pairs.
> Use newly introduced disable helper function in error unwinding and
> virtnet_close. Use enable helper function in virtnet_open.
>
> Fixes: 754b8a21a96d ("virtio_net: setup xdp_rxq_info")
> Signed-off-by: Feng Liu <feliu@nvidia.com>
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> Reviewed-by: William Tu <witu@nvidia.com>

Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>

Thanks.

> ---
> v5 -> v6
> feedbacks from Xuan Zhuo
> - add disable_delayed_refill and cancel_delayed_work_sync
>
> v4 -> v5
> feedbacks from Michael S. Tsirkin
> - rename helper as virtnet_disable_queue_pair
> - rename helper as virtnet_enable_queue_pair
>
> v3 -> v4
> feedbacks from Jiri Pirko
> - Add symmetric helper function virtnet_enable_qp to enable queues.
> - Error handle:  cleanup current queue pair in virtnet_enable_qp,
>   and complete the reset queue pairs cleanup in virtnet_open.
> - Fix coding style.
> feedbacks from Parav Pandit
> - Remove redundant debug message and white space.
>
> v2 -> v3
> feedbacks from Michael S. Tsirkin
> - Remove redundant comment.
>
> v1 -> v2
> feedbacks from Michael S. Tsirkin
> - squash two patches together.
>
> ---
>  drivers/net/virtio_net.c | 61 +++++++++++++++++++++++++++++-----------
>  1 file changed, 44 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index a12ae26db0e2..56ca1d270304 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1868,6 +1868,38 @@ static int virtnet_poll(struct napi_struct *napi, int budget)
>  	return received;
>  }
>
> +static void virtnet_disable_queue_pair(struct virtnet_info *vi, int qp_index)
> +{
> +	virtnet_napi_tx_disable(&vi->sq[qp_index].napi);
> +	napi_disable(&vi->rq[qp_index].napi);
> +	xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
> +}
> +
> +static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index)
> +{
> +	struct net_device *dev = vi->dev;
> +	int err;
> +
> +	err = xdp_rxq_info_reg(&vi->rq[qp_index].xdp_rxq, dev, qp_index,
> +			       vi->rq[qp_index].napi.napi_id);
> +	if (err < 0)
> +		return err;
> +
> +	err = xdp_rxq_info_reg_mem_model(&vi->rq[qp_index].xdp_rxq,
> +					 MEM_TYPE_PAGE_SHARED, NULL);
> +	if (err < 0)
> +		goto err_xdp_reg_mem_model;
> +
> +	virtnet_napi_enable(vi->rq[qp_index].vq, &vi->rq[qp_index].napi);
> +	virtnet_napi_tx_enable(vi, vi->sq[qp_index].vq, &vi->sq[qp_index].napi);
> +
> +	return 0;
> +
> +err_xdp_reg_mem_model:
> +	xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
> +	return err;
> +}
> +
>  static int virtnet_open(struct net_device *dev)
>  {
>  	struct virtnet_info *vi = netdev_priv(dev);
> @@ -1881,22 +1913,20 @@ static int virtnet_open(struct net_device *dev)
>  			if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
>  				schedule_delayed_work(&vi->refill, 0);
>
> -		err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i, vi->rq[i].napi.napi_id);
> +		err = virtnet_enable_queue_pair(vi, i);
>  		if (err < 0)
> -			return err;
> -
> -		err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq,
> -						 MEM_TYPE_PAGE_SHARED, NULL);
> -		if (err < 0) {
> -			xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
> -			return err;
> -		}
> -
> -		virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
> -		virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi);
> +			goto err_enable_qp;
>  	}
>
>  	return 0;
> +
> +err_enable_qp:
> +	disable_delayed_refill(vi);
> +	cancel_delayed_work_sync(&vi->refill);
> +
> +	for (i--; i >= 0; i--)
> +		virtnet_disable_queue_pair(vi, i);
> +	return err;
>  }
>
>  static int virtnet_poll_tx(struct napi_struct *napi, int budget)
> @@ -2305,11 +2335,8 @@ static int virtnet_close(struct net_device *dev)
>  	/* Make sure refill_work doesn't re-enable napi! */
>  	cancel_delayed_work_sync(&vi->refill);
>
> -	for (i = 0; i < vi->max_queue_pairs; i++) {
> -		virtnet_napi_tx_disable(&vi->sq[i].napi);
> -		napi_disable(&vi->rq[i].napi);
> -		xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
> -	}
> +	for (i = 0; i < vi->max_queue_pairs; i++)
> +		virtnet_disable_queue_pair(vi, i);
>
>  	return 0;
>  }
> --
> 2.37.1 (Apple Git-137.1)
>

Re: [PATCH net v6] virtio_net: Fix error unwinding of XDP initialization

[Michael S. Tsirkin]

On Fri, May 12, 2023 at 11:18:12AM -0400, Feng Liu wrote:
> When initializing XDP in virtnet_open(), some rq xdp initialization
> may hit an error causing net device open failed. However, previous
> rqs have already initialized XDP and enabled NAPI, which is not the
> expected behavior. Need to roll back the previous rq initialization
> to avoid leaks in error unwinding of init code.
> 
> Also extract helper functions of disable and enable queue pairs.
> Use newly introduced disable helper function in error unwinding and
> virtnet_close. Use enable helper function in virtnet_open.
> 
> Fixes: 754b8a21a96d ("virtio_net: setup xdp_rxq_info")
> Signed-off-by: Feng Liu <feliu@nvidia.com>
> Reviewed-by: Jiri Pirko <jiri@nvidia.com>
> Reviewed-by: William Tu <witu@nvidia.com>

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
> v5 -> v6
> feedbacks from Xuan Zhuo
> - add disable_delayed_refill and cancel_delayed_work_sync
> 
> v4 -> v5
> feedbacks from Michael S. Tsirkin
> - rename helper as virtnet_disable_queue_pair
> - rename helper as virtnet_enable_queue_pair
> 
> v3 -> v4
> feedbacks from Jiri Pirko
> - Add symmetric helper function virtnet_enable_qp to enable queues.
> - Error handle:  cleanup current queue pair in virtnet_enable_qp,
>   and complete the reset queue pairs cleanup in virtnet_open.
> - Fix coding style.
> feedbacks from Parav Pandit
> - Remove redundant debug message and white space.
> 
> v2 -> v3
> feedbacks from Michael S. Tsirkin
> - Remove redundant comment.
> 
> v1 -> v2
> feedbacks from Michael S. Tsirkin
> - squash two patches together.
> 
> ---
>  drivers/net/virtio_net.c | 61 +++++++++++++++++++++++++++++-----------
>  1 file changed, 44 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index a12ae26db0e2..56ca1d270304 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -1868,6 +1868,38 @@ static int virtnet_poll(struct napi_struct *napi, int budget)
>  	return received;
>  }
>  
> +static void virtnet_disable_queue_pair(struct virtnet_info *vi, int qp_index)
> +{
> +	virtnet_napi_tx_disable(&vi->sq[qp_index].napi);
> +	napi_disable(&vi->rq[qp_index].napi);
> +	xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
> +}
> +
> +static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index)
> +{
> +	struct net_device *dev = vi->dev;
> +	int err;
> +
> +	err = xdp_rxq_info_reg(&vi->rq[qp_index].xdp_rxq, dev, qp_index,
> +			       vi->rq[qp_index].napi.napi_id);
> +	if (err < 0)
> +		return err;
> +
> +	err = xdp_rxq_info_reg_mem_model(&vi->rq[qp_index].xdp_rxq,
> +					 MEM_TYPE_PAGE_SHARED, NULL);
> +	if (err < 0)
> +		goto err_xdp_reg_mem_model;
> +
> +	virtnet_napi_enable(vi->rq[qp_index].vq, &vi->rq[qp_index].napi);
> +	virtnet_napi_tx_enable(vi, vi->sq[qp_index].vq, &vi->sq[qp_index].napi);
> +
> +	return 0;
> +
> +err_xdp_reg_mem_model:
> +	xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
> +	return err;
> +}
> +
>  static int virtnet_open(struct net_device *dev)
>  {
>  	struct virtnet_info *vi = netdev_priv(dev);
> @@ -1881,22 +1913,20 @@ static int virtnet_open(struct net_device *dev)
>  			if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
>  				schedule_delayed_work(&vi->refill, 0);
>  
> -		err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i, vi->rq[i].napi.napi_id);
> +		err = virtnet_enable_queue_pair(vi, i);
>  		if (err < 0)
> -			return err;
> -
> -		err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq,
> -						 MEM_TYPE_PAGE_SHARED, NULL);
> -		if (err < 0) {
> -			xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
> -			return err;
> -		}
> -
> -		virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
> -		virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi);
> +			goto err_enable_qp;
>  	}
>  
>  	return 0;
> +
> +err_enable_qp:
> +	disable_delayed_refill(vi);
> +	cancel_delayed_work_sync(&vi->refill);
> +
> +	for (i--; i >= 0; i--)
> +		virtnet_disable_queue_pair(vi, i);
> +	return err;
>  }
>  
>  static int virtnet_poll_tx(struct napi_struct *napi, int budget)
> @@ -2305,11 +2335,8 @@ static int virtnet_close(struct net_device *dev)
>  	/* Make sure refill_work doesn't re-enable napi! */
>  	cancel_delayed_work_sync(&vi->refill);
>  
> -	for (i = 0; i < vi->max_queue_pairs; i++) {
> -		virtnet_napi_tx_disable(&vi->sq[i].napi);
> -		napi_disable(&vi->rq[i].napi);
> -		xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
> -	}
> +	for (i = 0; i < vi->max_queue_pairs; i++)
> +		virtnet_disable_queue_pair(vi, i);
>  
>  	return 0;
>  }
> -- 
> 2.37.1 (Apple Git-137.1)

Re: [PATCH net v6] virtio_net: Fix error unwinding of XDP initialization

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <davem@davemloft.net>:

On Fri, 12 May 2023 11:18:12 -0400 you wrote:
> When initializing XDP in virtnet_open(), some rq xdp initialization
> may hit an error causing net device open failed. However, previous
> rqs have already initialized XDP and enabled NAPI, which is not the
> expected behavior. Need to roll back the previous rq initialization
> to avoid leaks in error unwinding of init code.
> 
> Also extract helper functions of disable and enable queue pairs.
> Use newly introduced disable helper function in error unwinding and
> virtnet_close. Use enable helper function in virtnet_open.
> 
> [...]

Here is the summary with links:
  - [net,v6] virtio_net: Fix error unwinding of XDP initialization
    https://git.kernel.org/netdev/net/c/5306623a9826

You are awesome, thank you!
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