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vdpa_sim_blk: add support for vdpa management tool 

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@redhat.com>
Link: https://lore.kernel.org/r/20210315163450.254396-15-sgarzare@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Stefano Garzarella 2021-03-15 17:34:50 +01:00 committed by Michael S. Tsirkin
parent e6fa605227
commit 899c4d187f
1 changed files with 63 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
View File

@ -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 vdpasim_blk_dev_del(struct vdpa_mgmt_dev *mdev,
struct vdpa_device *dev)
{
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
};
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)
{
struct vdpa_device *vdpa = &vdpasim_blk_dev->vdpa;
vdpa_unregister_device(vdpa);
vdpa_mgmtdev_unregister(&mgmt_dev);
device_unregister(&vdpasim_blk_mgmtdev);
}
module_init(vdpasim_blk_init)