[dpdk-dev] [PATCH 2/9] vhost: refactor Virtio ready check

[Maxime Coquelin <maxime.coquelin@redhat.com>]

This patch is a small refactoring, as preliminary work
for adding support to Virtio status support.

No functionnal change here.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 lib/librte_vhost/vhost.c      |  1 +
 lib/librte_vhost/vhost_user.c | 40 +++++++++++++++++++++--------------
 2 files changed, 25 insertions(+), 16 deletions(-)

diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index 0266318440..fd8ba1be2d 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -716,6 +716,7 @@ vhost_enable_dequeue_zero_copy(int vid)
 		return;
 
 	dev->dequeue_zero_copy = 1;
+	VHOST_LOG_CONFIG(INFO, "dequeue zero copy is enabled\n");
 }
 
 void
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 106b6d7609..f5800bd9c1 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -1315,6 +1315,9 @@ virtio_is_ready(struct virtio_net *dev)
 	struct vhost_virtqueue *vq;
 	uint32_t i;
 
+	if (dev->flags & VIRTIO_DEV_READY)
+		return 1;
+
 	if (dev->nr_vring == 0)
 		return 0;
 
@@ -1325,8 +1328,11 @@ virtio_is_ready(struct virtio_net *dev)
 			return 0;
 	}
 
+	dev->flags |= VIRTIO_DEV_READY;
+
 	VHOST_LOG_CONFIG(INFO,
 		"virtio is now ready for processing.\n");
+
 	return 1;
 }
 
@@ -2606,7 +2612,6 @@ vhost_user_msg_handler(int vid, int fd)
 	struct virtio_net *dev;
 	struct VhostUserMsg msg;
 	struct rte_vdpa_device *vdpa_dev;
-	int did = -1;
 	int ret;
 	int unlock_required = 0;
 	bool handled;
@@ -2784,30 +2789,33 @@ vhost_user_msg_handler(int vid, int fd)
 		return -1;
 	}
 
-	if (!(dev->flags & VIRTIO_DEV_READY) && virtio_is_ready(dev)) {
-		dev->flags |= VIRTIO_DEV_READY;
+	if (!virtio_is_ready(dev))
+		goto out;
 
-		if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
-			if (dev->dequeue_zero_copy) {
-				VHOST_LOG_CONFIG(INFO,
-						"dequeue zero copy is enabled\n");
-			}
+	/*
+	 * Virtio is now ready. If not done already, it is time
+	 * to notify the application it can process the rings and
+	 * configure the vDPA device if present.
+	 */
 
-			if (dev->notify_ops->new_device(dev->vid) == 0)
-				dev->flags |= VIRTIO_DEV_RUNNING;
-		}
+	if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
+		if (dev->notify_ops->new_device(dev->vid) == 0)
+			dev->flags |= VIRTIO_DEV_RUNNING;
 	}
 
-	did = dev->vdpa_dev_id;
-	vdpa_dev = rte_vdpa_get_device(did);
-	if (vdpa_dev && virtio_is_ready(dev) &&
-			!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED) &&
-			msg.request.master == VHOST_USER_SET_VRING_CALL) {
+	vdpa_dev = rte_vdpa_get_device(dev->vdpa_dev_id);
+	if (!vdpa_dev)
+		goto out;
+
+	if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED) &&
+			request == VHOST_USER_SET_VRING_CALL) {
 		if (vdpa_dev->ops->dev_conf)
 			vdpa_dev->ops->dev_conf(dev->vid);
+
 		dev->flags |= VIRTIO_DEV_VDPA_CONFIGURED;
 	}
 
+out:
 	return 0;
 }
 
-- 
2.25.4