[dpdk-dev] [PATCH v2 3/7] vhost: Add new ready status flag

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

This patch adds a new status flag indicating the Virtio device
is ready to operate.

This is required to be able to call rte_vhost_mtu_get() in the
.new_device() callback, as rte_vhost_mtu_get needs that the
negotiation is done, but it is too early to rely on running status
flag, which is set just after .new_device() returns.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 lib/librte_vhost/vhost.h      |  2 ++
 lib/librte_vhost/vhost_user.c | 20 +++++++++++++-------
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 549296f..e8b7e44 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -46,6 +46,8 @@
 
 /* Used to indicate that the device is running on a data core */
 #define VIRTIO_DEV_RUNNING 1
+/* Used to indicate that the device is ready to operate */
+#define VIRTIO_DEV_READY 2
 
 /* Backend value set by guest. */
 #define VIRTIO_DEV_STOPPED -1
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 69877a4..4726aaf 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -691,14 +691,18 @@ vhost_user_set_vring_kick(struct virtio_net *dev, struct VhostUserMsg *pmsg)
 		close(vq->kickfd);
 	vq->kickfd = file.fd;
 
-	if (virtio_is_ready(dev) && !(dev->flags & VIRTIO_DEV_RUNNING)) {
-		if (dev->dequeue_zero_copy) {
-			RTE_LOG(INFO, VHOST_CONFIG,
-				"dequeue zero copy is enabled\n");
-		}
+	if (virtio_is_ready(dev)) {
+		dev->flags |= VIRTIO_DEV_READY;
+
+		if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
+			if (dev->dequeue_zero_copy) {
+				RTE_LOG(INFO, VHOST_CONFIG,
+						"dequeue zero copy is enabled\n");
+			}
 
-		if (notify_ops->new_device(dev->vid) == 0)
-			dev->flags |= VIRTIO_DEV_RUNNING;
+			if (notify_ops->new_device(dev->vid) == 0)
+				dev->flags |= VIRTIO_DEV_RUNNING;
+		}
 	}
 }
 
@@ -733,6 +737,8 @@ vhost_user_get_vring_base(struct virtio_net *dev,
 		notify_ops->destroy_device(dev->vid);
 	}
 
+	dev->flags &= ~VIRTIO_DEV_READY;
+
 	/* Here we are safe to get the last used index */
 	state->num = vq->last_used_idx;
 
-- 
2.9.3