[dpdk-dev] [PATCH 10/14] vhost: introduce wrappers for some vDPA ops

[Maxime Coquelin]

This patch is preliminary work to make the vDPA device
structure opaque to the user application. Some callbacks
of the vDPA devices are used to query capabilities before
attaching to a Vhost port. This patch introduces wrappers
for these ops.

Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
 lib/librte_vhost/rte_vdpa.h            | 52 ++++++++++++++++++++++++++
 lib/librte_vhost/rte_vhost_version.map |  3 ++
 lib/librte_vhost/vdpa.c                | 28 ++++++++++++++
 3 files changed, 83 insertions(+)

diff --git a/lib/librte_vhost/rte_vdpa.h b/lib/librte_vhost/rte_vdpa.h
index 011befdc71..e830014d5a 100644
--- a/lib/librte_vhost/rte_vdpa.h
+++ b/lib/librte_vhost/rte_vdpa.h
@@ -185,4 +185,56 @@ rte_vhost_host_notifier_ctrl(int vid, bool enable);
 __rte_experimental
 int
 rte_vdpa_relay_vring_used(int vid, uint16_t qid, void *vring_m);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Get number of queue pairs supported by the vDPA device
+ *
+ * @param dev
+ *  vDP device pointer
+ * @param queue_num
+ *  pointer on where the number of queue is stored
+ * @return
+ *  0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vdpa_get_queue_num(struct rte_vdpa_device *dev, uint32_t *queue_num);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Get the Virtio features supported by the vDPA device
+ *
+ * @param dev
+ *  vDP device pointer
+ * @param features
+ *  pointer on where the supported features are stored
+ * @return
+ *  0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vdpa_get_features(struct rte_vdpa_device *dev, uint64_t *features);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Get the Vhost-user protocol features supported by the vDPA device
+ *
+ * @param dev
+ *  vDP device pointer
+ * @param features
+ *  pointer on where the supported protocol features are stored
+ * @return
+ *  0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vdpa_get_protocol_features(struct rte_vdpa_device *dev, uint64_t *features);
+
 #endif /* _RTE_VDPA_H_ */
diff --git a/lib/librte_vhost/rte_vhost_version.map b/lib/librte_vhost/rte_vhost_version.map
index 27d63ce6fe..6c74a3ec4f 100644
--- a/lib/librte_vhost/rte_vhost_version.map
+++ b/lib/librte_vhost/rte_vhost_version.map
@@ -67,4 +67,7 @@ EXPERIMENTAL {
 	rte_vhost_slave_config_change;
 	rte_vdpa_find_device_by_name;
 	rte_vdpa_get_rte_device;
+	rte_vdpa_get_queue_num;
+	rte_vdpa_get_features;
+	rte_vdpa_get_protocol_features;
 };
diff --git a/lib/librte_vhost/vdpa.c b/lib/librte_vhost/vdpa.c
index 8f4778e2fa..f00544b3ea 100644
--- a/lib/librte_vhost/vdpa.c
+++ b/lib/librte_vhost/vdpa.c
@@ -229,6 +229,34 @@ rte_vdpa_relay_vring_used(int vid, uint16_t qid, void *vring_m)
 	return -1;
 }
 
+int
+rte_vdpa_get_queue_num(struct rte_vdpa_device *dev, uint32_t *queue_num)
+{
+	if (dev == NULL || dev->ops == NULL || dev->ops->get_queue_num == NULL)
+		return -1;
+
+	return dev->ops->get_queue_num(dev, queue_num);
+}
+
+int
+rte_vdpa_get_features(struct rte_vdpa_device *dev, uint64_t *features)
+{
+	if (dev == NULL || dev->ops == NULL || dev->ops->get_features == NULL)
+		return -1;
+
+	return dev->ops->get_features(dev, features);
+}
+
+int
+rte_vdpa_get_protocol_features(struct rte_vdpa_device *dev, uint64_t *features)
+{
+	if (dev == NULL || dev->ops == NULL ||
+			dev->ops->get_protocol_features == NULL)
+		return -1;
+
+	return dev->ops->get_protocol_features(dev, features);
+}
+
 static int
 vdpa_dev_match(struct rte_vdpa_device *dev,
 	      const struct rte_device *rte_dev)
-- 
2.26.2