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vDPA: report virtio-block capacity to user space

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This commit allows userspace to query capacity of
a virtio-block device.

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Message-Id: <20240218185606.13509-2-lingshan.zhu@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhu Lingshan 2024-02-19 02:55:57 +08:00 committed by Michael S. Tsirkin
parent 2b666ee296
commit c2475a9a78
3 changed files with 38 additions and 0 deletions
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35
drivers/vdpa/vdpa.c
View File

@ -944,6 +944,38 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
return vdpa_dev_net_mq_config_fill(msg, features_device, &config);
}
static int
vdpa_dev_blk_capacity_config_fill(struct sk_buff *msg,
const struct virtio_blk_config *config)
{
u64 val_u64;
val_u64 = __virtio64_to_cpu(true, config->capacity);
return nla_put_u64_64bit(msg, VDPA_ATTR_DEV_BLK_CFG_CAPACITY,
val_u64, VDPA_ATTR_PAD);
}
static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
struct sk_buff *msg)
{
struct virtio_blk_config config = {};
u64 features_device;
vdev->config->get_config(vdev, 0, &config, sizeof(config));
features_device = vdev->config->get_device_features(vdev);
if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_FEATURES, features_device,
VDPA_ATTR_PAD))
return -EMSGSIZE;
if (vdpa_dev_blk_capacity_config_fill(msg, &config))
return -EMSGSIZE;
return 0;
}
static int
vdpa_dev_config_fill(struct vdpa_device *vdev, struct sk_buff *msg, u32 portid, u32 seq,
int flags, struct netlink_ext_ack *extack)
@ -988,6 +1020,9 @@ vdpa_dev_config_fill(struct vdpa_device *vdev, struct sk_buff *msg, u32 portid,
case VIRTIO_ID_NET:
err = vdpa_dev_net_config_fill(vdev, msg);
break;
case VIRTIO_ID_BLOCK:
err = vdpa_dev_blk_config_fill(vdev, msg);
break;
default:
err = -EOPNOTSUPP;
break;

1
include/linux/vdpa.h
View File

@ -7,6 +7,7 @@
#include <linux/interrupt.h>
#include <linux/vhost_iotlb.h>
#include <linux/virtio_net.h>
#include <linux/virtio_blk.h>
#include <linux/if_ether.h>
/**

2
include/uapi/linux/vdpa.h
View File

@ -56,6 +56,8 @@ enum vdpa_attr {
/* virtio features that are provisioned to the vDPA device */
VDPA_ATTR_DEV_FEATURES, /* u64 */
VDPA_ATTR_DEV_BLK_CFG_CAPACITY, /* u64 */
/* new attributes must be added above here */
VDPA_ATTR_MAX,
};