diff options
| author | Viktor Prutyanov <viktor@daynix.com> | 2023-04-13 11:18:54 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2023-04-21 03:02:35 -0400 |
| commit | af8ececda185078c096852edb4e1d7a2349e6856 (patch) | |
| tree | 2c27175bfdfe911223c936341a1e617d6db91531 /include | |
| parent | 3616bf377a5a8ef4f124dfde5f3522c4da335561 (diff) | |
virtio: add VIRTIO_F_NOTIFICATION_DATA feature support
According to VirtIO spec v1.2, VIRTIO_F_NOTIFICATION_DATA feature
indicates that the driver passes extra data along with the queue
notifications.
In a split queue case, the extra data is 16-bit available index. In a
packed queue case, the extra data is 1-bit wrap counter and 15-bit
available index.
Add support for this feature for MMIO, channel I/O and modern PCI
transports.
Signed-off-by: Viktor Prutyanov <viktor@daynix.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Message-Id: <20230413081855.36643-2-alvaro.karsz@solid-run.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/virtio_ring.h | 2 | ||||
| -rw-r--r-- | include/uapi/linux/virtio_config.h | 6 |
2 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h index 8b95b69ef694..2550c9170f4f 100644 --- a/include/linux/virtio_ring.h +++ b/include/linux/virtio_ring.h @@ -117,4 +117,6 @@ void vring_del_virtqueue(struct virtqueue *vq); void vring_transport_features(struct virtio_device *vdev); irqreturn_t vring_interrupt(int irq, void *_vq); + +u32 vring_notification_data(struct virtqueue *_vq); #endif /* _LINUX_VIRTIO_RING_H */ diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h index 3c05162bc988..2c712c654165 100644 --- a/include/uapi/linux/virtio_config.h +++ b/include/uapi/linux/virtio_config.h @@ -100,6 +100,12 @@ #define VIRTIO_F_SR_IOV 37 /* + * This feature indicates that the driver passes extra data (besides + * identifying the virtqueue) in its device notifications. + */ +#define VIRTIO_F_NOTIFICATION_DATA 38 + +/* * This feature indicates that the driver can reset a queue individually. */ #define VIRTIO_F_RING_RESET 40 |