[PATCH v2 2/3] net/virtio: store desc IOVA address in vring data structure

[Srujana Challa <schalla@marvell.com>]

Stores desc IOVA in the queue's vring data structure,
as preliminary work to provide a way for Virtio-user
to share desc IOVA to the vhost backend.

Signed-off-by: Srujana Challa <schalla@marvell.com>
---
 drivers/net/virtio/virtio_ring.h | 12 ++++++++----
 drivers/net/virtio/virtqueue.c   |  4 ++--
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/virtio/virtio_ring.h b/drivers/net/virtio/virtio_ring.h
index e848c0b73b..998605dbb5 100644
--- a/drivers/net/virtio/virtio_ring.h
+++ b/drivers/net/virtio/virtio_ring.h
@@ -83,6 +83,7 @@ struct vring_packed_desc_event {
 
 struct vring_packed {
 	unsigned int num;
+	rte_iova_t desc_iova;
 	struct vring_packed_desc *desc;
 	struct vring_packed_desc_event *driver;
 	struct vring_packed_desc_event *device;
@@ -90,6 +91,7 @@ struct vring_packed {
 
 struct vring {
 	unsigned int num;
+	rte_iova_t desc_iova;
 	struct vring_desc  *desc;
 	struct vring_avail *avail;
 	struct vring_used  *used;
@@ -149,11 +151,12 @@ vring_size(struct virtio_hw *hw, unsigned int num, unsigned long align)
 	return size;
 }
 static inline void
-vring_init_split(struct vring *vr, uint8_t *p, unsigned long align,
-	 unsigned int num)
+vring_init_split(struct vring *vr, uint8_t *p, rte_iova_t iova,
+		 unsigned long align, unsigned int num)
 {
 	vr->num = num;
 	vr->desc = (struct vring_desc *) p;
+	vr->desc_iova = iova;
 	vr->avail = (struct vring_avail *) (p +
 		num * sizeof(struct vring_desc));
 	vr->used = (void *)
@@ -161,11 +164,12 @@ vring_init_split(struct vring *vr, uint8_t *p, unsigned long align,
 }
 
 static inline void
-vring_init_packed(struct vring_packed *vr, uint8_t *p, unsigned long align,
-		 unsigned int num)
+vring_init_packed(struct vring_packed *vr, uint8_t *p, rte_iova_t iova,
+		  unsigned long align, unsigned int num)
 {
 	vr->num = num;
 	vr->desc = (struct vring_packed_desc *)p;
+	vr->desc_iova = iova;
 	vr->driver = (struct vring_packed_desc_event *)(p +
 			vr->num * sizeof(struct vring_packed_desc));
 	vr->device = (struct vring_packed_desc_event *)
diff --git a/drivers/net/virtio/virtqueue.c b/drivers/net/virtio/virtqueue.c
index 6f419665f1..cf46abfd06 100644
--- a/drivers/net/virtio/virtqueue.c
+++ b/drivers/net/virtio/virtqueue.c
@@ -282,13 +282,13 @@ virtio_init_vring(struct virtqueue *vq)
 	vq->vq_free_cnt = vq->vq_nentries;
 	memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
 	if (virtio_with_packed_queue(vq->hw)) {
-		vring_init_packed(&vq->vq_packed.ring, ring_mem,
+		vring_init_packed(&vq->vq_packed.ring, ring_mem, vq->vq_ring_mem,
 				  VIRTIO_VRING_ALIGN, size);
 		vring_desc_init_packed(vq, size);
 	} else {
 		struct vring *vr = &vq->vq_split.ring;
 
-		vring_init_split(vr, ring_mem, VIRTIO_VRING_ALIGN, size);
+		vring_init_split(vr, ring_mem, vq->vq_ring_mem, VIRTIO_VRING_ALIGN, size);
 		vring_desc_init_split(vr->desc, size);
 	}
 	/*
-- 
2.25.1