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virtio: add VIRTIO_RING_NO_LEGACY

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Add macro to disable legacy vring functions.

Signed-off-by: Matej Genci <matej.genci@nutanix.com>
Link: https://lore.kernel.org/r/20190911124942.243713-1-matej.genci@nutanix.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Matej Genci
2019-09-11 12:49:53 +00:00
committed by Michael S. Tsirkin
parent 3d77e6a880
commit e7c8cc35a6
2 changed files with 5 additions and 0 deletions
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4
include/uapi/linux/virtio_ring.h
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@@ -135,6 +135,8 @@ struct vring {
#define VRING_USED_ALIGN_SIZE 4
#define VRING_DESC_ALIGN_SIZE 16
#ifndef VIRTIO_RING_NO_LEGACY
/* The standard layout for the ring is a continuous chunk of memory which looks
* like this. We assume num is a power of 2.
*
@@ -181,6 +183,8 @@ static inline unsigned vring_size(unsigned int num, unsigned long align)
+ sizeof(__virtio16) * 3 + sizeof(struct vring_used_elem) * num;
}
#endif /* VIRTIO_RING_NO_LEGACY */
/* The following is used with USED_EVENT_IDX and AVAIL_EVENT_IDX */
/* Assuming a given event_idx value from the other side, if
* we have just incremented index from old to new_idx,