[v10,3/9] net/virtio: add packed virtqueue helpers
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Commit Message
Add helper functions to set/clear and check descriptor flags.
Signed-off-by: Jens Freimann <jfreimann@redhat.com>
---
drivers/net/virtio/virtqueue.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
@@ -250,6 +250,31 @@ struct virtio_tx_region {
__attribute__((__aligned__(16)));
};
+static inline void
+_set_desc_avail(struct vring_desc_packed *desc, int wrap_counter)
+{
+ desc->flags |= VRING_DESC_F_AVAIL(wrap_counter) |
+ VRING_DESC_F_USED(!wrap_counter);
+}
+
+static inline void
+set_desc_avail(struct virtqueue *vq, struct vring_desc_packed *desc)
+{
+ _set_desc_avail(desc, vq->avail_wrap_counter);
+}
+
+static inline int
+desc_is_used(struct vring_desc_packed *desc, struct virtqueue *vq)
+{
+ uint16_t used, flags;
+
+ flags = desc->flags;
+ used = !!(flags & VRING_DESC_F_USED(1));
+
+ return used == vq->used_wrap_counter;
+}
+
+
static inline void
vring_desc_init_packed(struct virtqueue *vq, int n)
{