[dpdk-dev] [PATCH v10 3/9] net/virtio: add packed virtqueue helpers

[Jens Freimann <jfreimann@redhat.com>]

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(+)

diff --git a/drivers/net/virtio/virtqueue.h b/drivers/net/virtio/virtqueue.h
index 90bff7e38..f84079ba9 100644
--- a/drivers/net/virtio/virtqueue.h
+++ b/drivers/net/virtio/virtqueue.h
@@ -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)
 {
-- 
2.17.1