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vDPA: introduce get_vq_size to vdpa_config_ops

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This commit introduces a new interface get_vq_size to
vDPA config ops, this new interface intends to report
the size of a specific virtqueue

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Message-Id: <20240202163905.8834-3-lingshan.zhu@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhu Lingshan 2024-02-03 00:38:57 +08:00 committed by Michael S. Tsirkin
parent 1496c47065
commit 0a926fc972
2 changed files with 13 additions and 0 deletions
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8
drivers/vhost/vdpa.c
View file

@ -687,6 +687,14 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
if (!ops->set_group_asid)
return -EOPNOTSUPP;
return ops->set_group_asid(vdpa, idx, s.num);
case VHOST_VDPA_GET_VRING_SIZE:
if (!ops->get_vq_size)
return -EOPNOTSUPP;
s.index = idx;
s.num = ops->get_vq_size(vdpa, idx);
if (copy_to_user(argp, &s, sizeof(s)))
return -EFAULT;
return 0;
case VHOST_GET_VRING_BASE:
r = ops->get_vq_state(v->vdpa, idx, &vq_state);
if (r)

5
include/linux/vdpa.h
View file

@ -195,6 +195,10 @@ struct vdpa_map_file {
* @idx: virtqueue index
* Returns int: irq number of a virtqueue,
* negative number if no irq assigned.
* @get_vq_size: Get the size of a specific virtqueue (optional)
* @vdev: vdpa device
* @idx: virtqueue index
* Return u16: the size of the virtqueue
* @get_vq_align: Get the virtqueue align requirement
* for the device
* @vdev: vdpa device
@ -386,6 +390,7 @@ struct vdpa_config_ops {
(*get_vq_notification)(struct vdpa_device *vdev, u16 idx);
/* vq irq is not expected to be changed once DRIVER_OK is set */
int (*get_vq_irq)(struct vdpa_device *vdev, u16 idx);
u16 (*get_vq_size)(struct vdpa_device *vdev, u16 idx);
/* Device ops */
u32 (*get_vq_align)(struct vdpa_device *vdev);