diff options
Diffstat (limited to 'include/linux/virtio_ring.h')
| -rw-r--r-- | include/linux/virtio_ring.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h index c349af90ce..bdef47b0fa 100644 --- a/include/linux/virtio_ring.h +++ b/include/linux/virtio_ring.h @@ -181,6 +181,40 @@ int virtqueue_add(struct virtqueue *vq, struct virtio_sg *sgs[], unsigned int out_sgs, unsigned int in_sgs); /** + * virtqueue_add_outbuf - expose output buffers to other end + * @vq: the struct virtqueue we're talking about. + * @sg: scatterlist (must be well-formed and terminated!) + * @num: the number of entries in @sg readable by other side + * + * Caller must ensure we don't call this with other virtqueue operations + * at the same time (except where noted). + * + * Returns zero or a negative error (ie. ENOSPC, ENOMEM, EIO). + */ +static inline int virtqueue_add_outbuf(struct virtqueue *vq, + struct virtio_sg *sg, unsigned int num) +{ + return virtqueue_add(vq, &sg, num, 0); +} + +/** + * virtqueue_add_inbuf - expose input buffers to other end + * @vq: the struct virtqueue we're talking about. + * @sg: scatterlist (must be well-formed and terminated!) + * @num: the number of entries in @sg writable by other side + * + * Caller must ensure we don't call this with other virtqueue operations + * at the same time (except where noted). + * + * Returns zero or a negative error (ie. ENOSPC, ENOMEM, EIO). + */ +static inline int virtqueue_add_inbuf(struct virtqueue *vq, + struct virtio_sg *sg, unsigned int num) +{ + return virtqueue_add(vq, &sg, 0, num); +} + +/** * virtqueue_kick - update after add_buf * * @vq: the struct virtqueue |