linux-kernel - Re: [PATCH v4 14/14] vdpa_sim_blk: add support for vdpa management tool

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Date:   Thu, 18 Mar 2021 11:31:54 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>,
        virtualization@...ts.linux-foundation.org
Cc:     netdev@...r.kernel.org, Xie Yongji <xieyongji@...edance.com>,
        Laurent Vivier <lvivier@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        linux-kernel@...r.kernel.org, Max Gurtovoy <mgurtovoy@...dia.com>,
        Parav Pandit <parav@...dia.com>,
        "Michael S. Tsirkin" <mst@...hat.com>, kvm@...r.kernel.org
Subject: Re: [PATCH v4 14/14] vdpa_sim_blk: add support for vdpa management
 tool


在 2021/3/16 上午12:34, Stefano Garzarella 写道:
> Enable the user to create vDPA block simulator devices using the
> vdpa management tool:
>
>      # Show vDPA supported devices
>      $ vdpa mgmtdev show
>      vdpasim_blk:
>        supported_classes block
>
>      # Create a vDPA block device named as 'blk0' from the management
>      # device vdpasim:
>      $ vdpa dev add mgmtdev vdpasim_blk name blk0
>
>      # Show the info of the 'blk0' device just created
>      $ vdpa dev show blk0 -jp
>      {
>          "dev": {
>              "blk0": {
>                  "type": "block",
>                  "mgmtdev": "vdpasim_blk",
>                  "vendor_id": 0,
>                  "max_vqs": 1,
>                  "max_vq_size": 256
>              }
>          }
>      }
>
>      # Delete the vDPA device after its use
>      $ vdpa dev del blk0
>
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>


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


> ---
>   drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 76 +++++++++++++++++++++++-----
>   1 file changed, 63 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
> index 643ae3bc62c0..5bfe1c281645 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
> @@ -37,7 +37,6 @@
>   #define VDPASIM_BLK_SEG_MAX	32
>   #define VDPASIM_BLK_VQ_NUM	1
>   
> -static struct vdpasim *vdpasim_blk_dev;
>   static char vdpasim_blk_id[VIRTIO_BLK_ID_BYTES] = "vdpa_blk_sim";
>   
>   static bool vdpasim_blk_check_range(u64 start_sector, size_t range_size)
> @@ -241,11 +240,23 @@ static void vdpasim_blk_get_config(struct vdpasim *vdpasim, void *config)
>   	blk_config->blk_size = cpu_to_vdpasim32(vdpasim, SECTOR_SIZE);
>   }
>   
> -static int __init vdpasim_blk_init(void)
> +static void vdpasim_blk_mgmtdev_release(struct device *dev)
> +{
> +}
> +
> +static struct device vdpasim_blk_mgmtdev = {
> +	.init_name = "vdpasim_blk",
> +	.release = vdpasim_blk_mgmtdev_release,
> +};
> +
> +static int vdpasim_blk_dev_add(struct vdpa_mgmt_dev *mdev, const char *name)
>   {
>   	struct vdpasim_dev_attr dev_attr = {};
> +	struct vdpasim *simdev;
>   	int ret;
>   
> +	dev_attr.mgmt_dev = mdev;
> +	dev_attr.name = name;
>   	dev_attr.id = VIRTIO_ID_BLOCK;
>   	dev_attr.supported_features = VDPASIM_BLK_FEATURES;
>   	dev_attr.nvqs = VDPASIM_BLK_VQ_NUM;
> @@ -254,29 +265,68 @@ static int __init vdpasim_blk_init(void)
>   	dev_attr.work_fn = vdpasim_blk_work;
>   	dev_attr.buffer_size = VDPASIM_BLK_CAPACITY << SECTOR_SHIFT;
>   
> -	vdpasim_blk_dev = vdpasim_create(&dev_attr);
> -	if (IS_ERR(vdpasim_blk_dev)) {
> -		ret = PTR_ERR(vdpasim_blk_dev);
> -		goto out;
> -	}
> +	simdev = vdpasim_create(&dev_attr);
> +	if (IS_ERR(simdev))
> +		return PTR_ERR(simdev);
>   
> -	ret = vdpa_register_device(&vdpasim_blk_dev->vdpa, VDPASIM_BLK_VQ_NUM);
> +	ret = _vdpa_register_device(&simdev->vdpa, VDPASIM_BLK_VQ_NUM);
>   	if (ret)
>   		goto put_dev;
>   
>   	return 0;
>   
>   put_dev:
> -	put_device(&vdpasim_blk_dev->vdpa.dev);
> -out:
> +	put_device(&simdev->vdpa.dev);
>   	return ret;
>   }
>   
> -static void __exit vdpasim_blk_exit(void)
> +static void vdpasim_blk_dev_del(struct vdpa_mgmt_dev *mdev,
> +				struct vdpa_device *dev)
>   {
> -	struct vdpa_device *vdpa = &vdpasim_blk_dev->vdpa;
> +	struct vdpasim *simdev = container_of(dev, struct vdpasim, vdpa);
> +
> +	_vdpa_unregister_device(&simdev->vdpa);
> +}
> +
> +static const struct vdpa_mgmtdev_ops vdpasim_blk_mgmtdev_ops = {
> +	.dev_add = vdpasim_blk_dev_add,
> +	.dev_del = vdpasim_blk_dev_del
> +};
>   
> -	vdpa_unregister_device(vdpa);
> +static struct virtio_device_id id_table[] = {
> +	{ VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
> +	{ 0 },
> +};
> +
> +static struct vdpa_mgmt_dev mgmt_dev = {
> +	.device = &vdpasim_blk_mgmtdev,
> +	.id_table = id_table,
> +	.ops = &vdpasim_blk_mgmtdev_ops,
> +};
> +
> +static int __init vdpasim_blk_init(void)
> +{
> +	int ret;
> +
> +	ret = device_register(&vdpasim_blk_mgmtdev);
> +	if (ret)
> +		return ret;
> +
> +	ret = vdpa_mgmtdev_register(&mgmt_dev);
> +	if (ret)
> +		goto parent_err;
> +
> +	return 0;
> +
> +parent_err:
> +	device_unregister(&vdpasim_blk_mgmtdev);
> +	return ret;
> +}
> +
> +static void __exit vdpasim_blk_exit(void)
> +{
> +	vdpa_mgmtdev_unregister(&mgmt_dev);
> +	device_unregister(&vdpasim_blk_mgmtdev);
>   }
>   
>   module_init(vdpasim_blk_init)