The function vring_virtqueue_detach_packed() is introduced to detach the vring of the current vq.
Add two new members. last_used_idx is used to record the position where the current vring desc is used, which can be used to obtain buffers from the vring in order. Another num_left records how many buffers there are, which can be used to check the recovery of buffers completed. Signed-off-by: Xuan Zhuo <[email protected]> --- drivers/virtio/virtio_ring.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 436b18184dfe..219e008a4633 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -154,6 +154,10 @@ struct vring_virtqueue_packed { dma_addr_t device_event_dma_addr; size_t ring_size_in_bytes; size_t event_size_in_bytes; + + /* for vring detach */ + u16 last_used_idx; + u32 num_left; }; struct vring_virtqueue { @@ -2090,6 +2094,25 @@ static int vring_alloc_state_extra_packed(struct vring_virtqueue_packed *vring) return -ENOMEM; } +static void vring_virtqueue_detach_packed(struct vring_virtqueue *vq, + struct vring_virtqueue_packed *vring) +{ + vring->vring = vq->packed.vring; + + vring->ring_dma_addr = vq->packed.ring_dma_addr; + vring->driver_event_dma_addr = vq->packed.driver_event_dma_addr; + vring->device_event_dma_addr = vq->packed.device_event_dma_addr; + + vring->ring_size_in_bytes = vq->packed.ring_size_in_bytes; + vring->event_size_in_bytes = vq->packed.event_size_in_bytes; + + vring->desc_state = vq->packed.desc_state; + vring->desc_extra = vq->packed.desc_extra; + + vring->last_used_idx = vq->last_used_idx; + vring->num_left = vq->packed.vring.num - vq->vq.num_free; +} + static void virtqueue_vring_attach_packed(struct vring_virtqueue *vq, struct vring_virtqueue_packed *vring) { -- 2.31.0 _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
