[PATCH v3 7/8] vhost: vDPA blk device gets ready when any queue is ready

[Andy Pei]

When boot from virtio blk device, seabios in QEMU only enables one queue.
To work in this scenario, vDPA BLK device back-end conf_dev when any
queue is ready.

Signed-off-by: Andy Pei <andy....@intel.com>
Signed-off-by: Huang Wei <wei.hu...@intel.com>
---
 lib/vhost/vhost_user.c | 51 ++++++++++++++++++++++++++++++++------------------
 1 file changed, 33 insertions(+), 18 deletions(-)

diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
index 4ad28ba..9169cf5 100644
--- a/lib/vhost/vhost_user.c
+++ b/lib/vhost/vhost_user.c
@@ -1449,9 +1449,10 @@
 }
 
 #define VIRTIO_BUILTIN_NUM_VQS_TO_BE_READY 2u
+#define VIRTIO_BLK_NUM_VQS_TO_BE_READY 1u
 
 static int
-virtio_is_ready(struct virtio_net *dev)
+virtio_is_ready(struct virtio_net *dev, uint32_t vdpa_type)
 {
        struct vhost_virtqueue *vq;
        uint32_t i, nr_vring = dev->nr_vring;
@@ -1462,13 +1463,20 @@
        if (!dev->nr_vring)
                return 0;
 
-       if (dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET) {
-               nr_vring = VIRTIO_BUILTIN_NUM_VQS_TO_BE_READY;
-
-               if (dev->nr_vring < nr_vring)
-                       return 0;
+       if (vdpa_type == RTE_VHOST_VDPA_DEVICE_TYPE_NET) {
+               if (dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET)
+                       nr_vring = VIRTIO_BUILTIN_NUM_VQS_TO_BE_READY;
+       } else {
+               /*
+                * vdpa_type == RTE_VHOST_VDPA_DEVICE_TYPE_BLK
+                * is the only case currently
+                */
+               nr_vring = VIRTIO_BLK_NUM_VQS_TO_BE_READY;
        }
 
+       if (dev->nr_vring < nr_vring)
+               return 0;
+
        for (i = 0; i < nr_vring; i++) {
                vq = dev->virtqueue[i];
 
@@ -3167,7 +3175,25 @@ static int is_vring_iotlb(struct virtio_net *dev,
        if (unlock_required)
                vhost_user_unlock_all_queue_pairs(dev);
 
-       if (ret != 0 || !virtio_is_ready(dev))
+       if (ret != 0)
+               goto out;
+
+       vdpa_dev = dev->vdpa_dev;
+       if (vdpa_dev) {
+               if (vdpa_dev->ops->get_dev_type) {
+                       ret = vdpa_dev->ops->get_dev_type(vdpa_dev, &vdpa_type);
+                       if (ret) {
+                               VHOST_LOG_CONFIG(dev->ifname, ERR,
+                                       "failed to get vdpa dev type.\n");
+                               ret = -1;
+                               goto out;
+                       }
+               } else {
+                       vdpa_type = RTE_VHOST_VDPA_DEVICE_TYPE_NET;
+               }
+       }
+
+       if (!virtio_is_ready(dev, vdpa_type))
                goto out;
 
        /*
@@ -3181,20 +3207,9 @@ static int is_vring_iotlb(struct virtio_net *dev,
                        dev->flags |= VIRTIO_DEV_RUNNING;
        }
 
-       vdpa_dev = dev->vdpa_dev;
        if (!vdpa_dev)
                goto out;
 
-       if (vdpa_dev->ops->get_dev_type) {
-               ret = vdpa_dev->ops->get_dev_type(vdpa_dev, &vdpa_type);
-               if (ret) {
-                       VHOST_LOG_CONFIG(dev->ifname, ERR, "failed to get vdpa 
dev type.\n");
-                       ret = -1;
-                       goto out;
-               }
-       } else {
-               vdpa_type = RTE_VHOST_VDPA_DEVICE_TYPE_NET;
-       }
        if (vdpa_type == RTE_VHOST_VDPA_DEVICE_TYPE_BLK
                && request != VHOST_USER_SET_VRING_CALL)
                goto out;
-- 
1.8.3.1