Re: [PATCH V2 17/19] vdpa: set the virtqueue num during register

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On Fri, Dec 04, 2020 at 12:03:51PM +0800, Jason Wang wrote:
This patch delay the queue number setting to vDPA device
registering. This allows us to probe the virtqueue numbers between
device allocation and registering.

Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/vdpa/ifcvf/ifcvf_main.c   | 5 ++---
drivers/vdpa/mlx5/net/mlx5_vnet.c | 5 ++---
drivers/vdpa/vdpa.c               | 8 ++++----
drivers/vdpa/vdpa_sim/vdpa_sim.c  | 4 ++--
include/linux/vdpa.h              | 7 +++----
5 files changed, 13 insertions(+), 16 deletions(-)

Reviewed-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>


diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index 8b4028556cb6..d65f3221d8ed 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -438,8 +438,7 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
	}

	adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
-				    dev, &ifc_vdpa_ops,
-				    IFCVF_MAX_QUEUE_PAIRS * 2);
+				    dev, &ifc_vdpa_ops);
	if (adapter == NULL) {
		IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
		return -ENOMEM;
@@ -463,7 +462,7 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
	for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++)
		vf->vring[i].irq = -EINVAL;

-	ret = vdpa_register_device(&adapter->vdpa);
+	ret = vdpa_register_device(&adapter->vdpa, IFCVF_MAX_QUEUE_PAIRS * 2);
	if (ret) {
		IFCVF_ERR(pdev, "Failed to register ifcvf to vdpa bus");
		goto err;
diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 1fa6fcac8299..3c3eb2a02f76 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -1940,8 +1940,7 @@ void *mlx5_vdpa_add_dev(struct mlx5_core_dev *mdev)
	max_vqs = MLX5_CAP_DEV_VDPA_EMULATION(mdev, max_num_virtio_queues);
	max_vqs = min_t(u32, max_vqs, MLX5_MAX_SUPPORTED_VQS);

-	ndev = vdpa_alloc_device(struct mlx5_vdpa_net, mvdev.vdev, mdev->device, &mlx5_vdpa_ops,
-				 2 * mlx5_vdpa_max_qps(max_vqs));
+	ndev = vdpa_alloc_device(struct mlx5_vdpa_net, mvdev.vdev, mdev->device, &mlx5_vdpa_ops);
	if (IS_ERR(ndev))
		return ndev;

@@ -1968,7 +1967,7 @@ void *mlx5_vdpa_add_dev(struct mlx5_core_dev *mdev)
	if (err)
		goto err_res;

-	err = vdpa_register_device(&mvdev->vdev);
+	err = vdpa_register_device(&mvdev->vdev, 2 * mlx5_vdpa_max_qps(max_vqs));
	if (err)
		goto err_reg;

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index a69ffc991e13..ba89238f9898 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -61,7 +61,6 @@ static void vdpa_release_dev(struct device *d)
 * initialized but before registered.
 * @parent: the parent device
 * @config: the bus operations that is supported by this device
- * @nvqs: number of virtqueues supported by this device
 * @size: size of the parent structure that contains private data
 *
 * Driver should use vdpa_alloc_device() wrapper macro instead of
@@ -72,7 +71,6 @@ static void vdpa_release_dev(struct device *d)
 */
struct vdpa_device *__vdpa_alloc_device(struct device *parent,
					const struct vdpa_config_ops *config,
-					int nvqs,
					size_t size)
{
	struct vdpa_device *vdev;
@@ -99,7 +97,6 @@ struct vdpa_device *__vdpa_alloc_device(struct device *parent,
	vdev->index = err;
	vdev->config = config;
	vdev->features_valid = false;
-	vdev->nvqs = nvqs;

	err = dev_set_name(&vdev->dev, "vdpa%u", vdev->index);
	if (err)
@@ -122,11 +119,14 @@ EXPORT_SYMBOL_GPL(__vdpa_alloc_device);
 * vdpa_register_device - register a vDPA device
 * Callers must have a succeed call of vdpa_alloc_device() before.
 * @vdev: the vdpa device to be registered to vDPA bus
+ * @nvqs: number of virtqueues supported by this device
 *
 * Returns an error when fail to add to vDPA bus
 */
-int vdpa_register_device(struct vdpa_device *vdev)
+int vdpa_register_device(struct vdpa_device *vdev, int nvqs)
{
+	vdev->nvqs = nvqs;
+
	return device_add(&vdev->dev);
}
EXPORT_SYMBOL_GPL(vdpa_register_device);
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index 6a90fdb9cbfc..b129cb4dd013 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -357,7 +357,7 @@ static struct vdpasim *vdpasim_create(void)
	else
		ops = &vdpasim_net_config_ops;

-	vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops, VDPASIM_VQ_NUM);
+	vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops);
	if (!vdpasim)
		goto err_alloc;

@@ -393,7 +393,7 @@ static struct vdpasim *vdpasim_create(void)
	vringh_set_iotlb(&vdpasim->vqs[1].vring, vdpasim->iommu);

	vdpasim->vdpa.dma_dev = dev;
-	ret = vdpa_register_device(&vdpasim->vdpa);
+	ret = vdpa_register_device(&vdpasim->vdpa, VDPASIM_VQ_NUM);
	if (ret)
		goto err_iommu;

diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 30bc7a7223bb..d9e9d17b9083 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -244,18 +244,17 @@ struct vdpa_config_ops {

struct vdpa_device *__vdpa_alloc_device(struct device *parent,
					const struct vdpa_config_ops *config,
-					int nvqs,
					size_t size);

-#define vdpa_alloc_device(dev_struct, member, parent, config, nvqs)   \
+#define vdpa_alloc_device(dev_struct, member, parent, config)   \
			  container_of(__vdpa_alloc_device( \
-				       parent, config, nvqs, \
+				       parent, config, \
				       sizeof(dev_struct) + \
				       BUILD_BUG_ON_ZERO(offsetof( \
				       dev_struct, member))), \
				       dev_struct, member)

-int vdpa_register_device(struct vdpa_device *vdev);
+int vdpa_register_device(struct vdpa_device *vdev, int nvqs);
void vdpa_unregister_device(struct vdpa_device *vdev);

/**
--
2.25.1

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