Message-ID: <20201204143016.xdjptprvtuthcebg@steredhat>
Date:   Fri, 4 Dec 2020 15:30:16 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, shahafs@...lanox.com
Subject: Re: [PATCH V2 17/19] vdpa: set the virtqueue num during register

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@...hat.com>
>---
> 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@...hat.com>

>
>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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>Virtualization@...ts.linux-foundation.org
>https://lists.linuxfoundation.org/mailman/listinfo/virtualization
>

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