diff options
| author | Alvaro Karsz <alvaro.karsz@solid-run.com> | 2023-04-13 11:18:55 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2023-04-21 10:02:35 +0300 |
| commit | 2c4e4a22a3b090e06191f8544d21e0e1d72ce518 (patch) | |
| tree | b569024d76ab4f73f878d37af81b04f209669ae7 /drivers/virtio | |
| parent | af8ececda185078c096852edb4e1d7a2349e6856 (diff) | |
| download | linux-2c4e4a22a3b090e06191f8544d21e0e1d72ce518.tar.xz | |
virtio-vdpa: add VIRTIO_F_NOTIFICATION_DATA feature support
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>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_vdpa.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c index 2a095f37f26b..eb6aee8c06b2 100644 --- a/drivers/virtio/virtio_vdpa.c +++ b/drivers/virtio/virtio_vdpa.c @@ -113,6 +113,17 @@ static bool virtio_vdpa_notify(struct virtqueue *vq) return true; } +static bool virtio_vdpa_notify_with_data(struct virtqueue *vq) +{ + struct vdpa_device *vdpa = vd_get_vdpa(vq->vdev); + const struct vdpa_config_ops *ops = vdpa->config; + u32 data = vring_notification_data(vq); + + ops->kick_vq_with_data(vdpa, data); + + return true; +} + static irqreturn_t virtio_vdpa_config_cb(void *private) { struct virtio_vdpa_device *vd_dev = private; @@ -139,6 +150,7 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index, struct device *dma_dev; const struct vdpa_config_ops *ops = vdpa->config; struct virtio_vdpa_vq_info *info; + bool (*notify)(struct virtqueue *vq) = virtio_vdpa_notify; struct vdpa_callback cb; struct virtqueue *vq; u64 desc_addr, driver_addr, device_addr; @@ -155,6 +167,14 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index, if (index >= vdpa->nvqs) return ERR_PTR(-ENOENT); + /* We cannot accept VIRTIO_F_NOTIFICATION_DATA without kick_vq_with_data */ + if (__virtio_test_bit(vdev, VIRTIO_F_NOTIFICATION_DATA)) { + if (ops->kick_vq_with_data) + notify = virtio_vdpa_notify_with_data; + else + __virtio_clear_bit(vdev, VIRTIO_F_NOTIFICATION_DATA); + } + /* Queue shouldn't already be set up. */ if (ops->get_vq_ready(vdpa, index)) return ERR_PTR(-ENOENT); @@ -184,8 +204,7 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index, dma_dev = vdpa_get_dma_dev(vdpa); vq = vring_create_virtqueue_dma(index, max_num, align, vdev, true, may_reduce_num, ctx, - virtio_vdpa_notify, callback, - name, dma_dev); + notify, callback, name, dma_dev); if (!vq) { err = -ENOMEM; goto error_new_virtqueue; |