[dpdk-dev] [PATCH 10/17] vhost: vring address setup for packed queues

[Jens Freimann]

From: Yuanhan Liu <yuanhan.liu at linux.intel.com>

Add code to set up packed queues when enabled.

Signed-off-by: Yuanhan Liu <yuanhan.liu at linux.intel.com>
Signed-off-by: Jens Freimann <jfreiman at redhat.com>
---
 lib/librte_vhost/vhost.c      |  1 +
 lib/librte_vhost/vhost.h      |  1 +
 lib/librte_vhost/vhost_user.c | 17 ++++++++++++++++-
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index a407067..a300812 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -567,6 +567,7 @@ struct virtio_net *
 		return -1;
 	}
 
+
 	dev->virtqueue[queue_id]->used->flags = VRING_USED_F_NO_NOTIFY;
 	return 0;
 }
diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 06e973e..d35c4b1 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -70,6 +70,7 @@ struct batch_copy_elem {
  */
 struct vhost_virtqueue {
 	struct vring_desc	*desc;
+	struct vring_desc_packed   *desc_packed;
 	struct vring_avail	*avail;
 	struct vring_used	*used;
 	uint32_t		size;
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 90ed211..bd1e393 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -415,6 +415,19 @@
 	struct vhost_virtqueue *vq = dev->virtqueue[vq_index];
 	struct vhost_vring_addr *addr = &vq->ring_addrs;
 
+	if (dev->features & (1ULL << VIRTIO_F_RING_PACKED)) {
+		vq->desc_packed = (struct vring_desc_packed *) ring_addr_to_vva
+			(dev, vq, addr->desc_user_addr, sizeof(vq->desc_packed));
+		vq->desc = NULL;
+		vq->avail = NULL;
+		vq->used = NULL;
+		vq->log_guest_addr = 0;
+
+		assert(vq->last_used_idx == 0);
+
+		return dev;
+	}
+
 	/* The addresses are converted from QEMU virtual to Vhost virtual. */
 	if (vq->desc && vq->avail && vq->used)
 		return dev;
@@ -427,6 +440,7 @@
 			dev->vid);
 		return dev;
 	}
+	vq->desc_packed = NULL;
 
 	dev = numa_realloc(dev, vq_index);
 	vq = dev->virtqueue[vq_index];
@@ -764,7 +778,8 @@
 static int
 vq_is_ready(struct vhost_virtqueue *vq)
 {
-	return vq && vq->desc && vq->avail && vq->used &&
+	return vq &&
+	       (vq->desc_packed || (vq->desc && vq->avail && vq->used)) &&
 	       vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
 	       vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD;
 }
-- 
1.8.3.1