diff options
Diffstat (limited to 'include/virtio_ring.h')
| -rw-r--r-- | include/virtio_ring.h | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/include/virtio_ring.h b/include/virtio_ring.h index c77c212cff..8f8a55c7bd 100644 --- a/include/virtio_ring.h +++ b/include/virtio_ring.h @@ -86,6 +86,7 @@ struct vring_used { struct vring { unsigned int num; + size_t size; struct vring_desc *desc; struct vring_avail *avail; struct vring_used *used; @@ -137,23 +138,24 @@ struct virtqueue { #define vring_used_event(vr) ((vr)->avail->ring[(vr)->num]) #define vring_avail_event(vr) (*(__virtio16 *)&(vr)->used->ring[(vr)->num]) +static inline unsigned int vring_size(unsigned int num, unsigned long align) +{ + return ((sizeof(struct vring_desc) * num + + sizeof(__virtio16) * (3 + num) + align - 1) & ~(align - 1)) + + sizeof(__virtio16) * 3 + sizeof(struct vring_used_elem) * num; +} + static inline void vring_init(struct vring *vr, unsigned int num, void *p, unsigned long align) { vr->num = num; + vr->size = vring_size(num, align); vr->desc = p; vr->avail = p + num * sizeof(struct vring_desc); vr->used = (void *)(((uintptr_t)&vr->avail->ring[num] + sizeof(__virtio16) + align - 1) & ~(align - 1)); } -static inline unsigned int vring_size(unsigned int num, unsigned long align) -{ - return ((sizeof(struct vring_desc) * num + - sizeof(__virtio16) * (3 + num) + align - 1) & ~(align - 1)) + - sizeof(__virtio16) * 3 + sizeof(struct vring_used_elem) * num; -} - /* * 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 |