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Subject[PATCH v4 14/14] vdpa_sim_blk: add support for vdpa management tool
Date
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>
---
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)
--
2.30.2
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