virtio: allow extra context per descriptor

Allow extra context per descriptor. To avoid slow down for data path,
this disables use of indirect descriptors for this vq.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 7edfbdb55a99..ed04753278d4 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -44,6 +44,12 @@ int virtqueue_add_inbuf(struct virtqueue *vq,
 			void *data,
 			gfp_t gfp);
 
+int virtqueue_add_inbuf_ctx(struct virtqueue *vq,
+			    struct scatterlist sg[], unsigned int num,
+			    void *data,
+			    void *ctx,
+			    gfp_t gfp);
+
 int virtqueue_add_sgs(struct virtqueue *vq,
 		      struct scatterlist *sgs[],
 		      unsigned int out_sgs,
@@ -59,6 +65,9 @@ bool virtqueue_notify(struct virtqueue *vq);
 
 void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
 
+void *virtqueue_get_buf_ctx(struct virtqueue *vq, unsigned int *len,
+			    void **ctx);
+
 void virtqueue_disable_cb(struct virtqueue *vq);
 
 bool virtqueue_enable_cb(struct virtqueue *vq);