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virtio-vdpa: add VIRTIO_F_NOTIFICATION_DATA feature support

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Add VIRTIO_F_NOTIFICATION_DATA support for vDPA transport.
If this feature is negotiated, the driver passes extra data when kicking
a virtqueue.

A device that offers this feature needs to implement the
kick_vq_with_data callback.

kick_vq_with_data receives the vDPA device and data.
data includes:
16 bits vqn and 16 bits next available index for split virtqueues.
16 bits vqs, 15 least significant bits of next available index
and 1 bit next_wrap for packed virtqueues.

This patch follows a patch [1] by Viktor Prutyanov which adds support
for the MMIO, channel I/O and modern PCI transports.

Signed-off-by: Alvaro Karsz <alvaro.karsz@solid-run.com>
Message-Id: <20230413081855.36643-3-alvaro.karsz@solid-run.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Alvaro Karsz
2023-04-13 11:18:55 +03:00
committed by Michael S. Tsirkin
parent af8ececda1
commit 2c4e4a22a3
2 changed files with 30 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
include/linux/vdpa.h
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@@ -149,6 +149,14 @@ struct vdpa_map_file {
* @kick_vq: Kick the virtqueue
* @vdev: vdpa device
* @idx: virtqueue index
* @kick_vq_with_data: Kick the virtqueue and supply extra data
* (only if VIRTIO_F_NOTIFICATION_DATA is negotiated)
* @vdev: vdpa device
* @data for split virtqueue:
* 16 bits vqn and 16 bits next available index.
* @data for packed virtqueue:
* 16 bits vqn, 15 least significant bits of
* next available index and 1 bit next_wrap.
* @set_vq_cb: Set the interrupt callback function for
* a virtqueue
* @vdev: vdpa device
@@ -329,6 +337,7 @@ struct vdpa_config_ops {
u64 device_area);
void (*set_vq_num)(struct vdpa_device *vdev, u16 idx, u32 num);
void (*kick_vq)(struct vdpa_device *vdev, u16 idx);
void (*kick_vq_with_data)(struct vdpa_device *vdev, u32 data);
void (*set_vq_cb)(struct vdpa_device *vdev, u16 idx,
struct vdpa_callback *cb);
void (*set_vq_ready)(struct vdpa_device *vdev, u16 idx, bool ready);