[dpdk-dev] [PATCH v2 1/2] vhost: Add API to get negotiated protocol features

[Keiichi Watanabe <keiichiw@chromium.org>]

Add rte_vhost_get_negotiated_protocol_features, which returns a set of
enabled protocol features.

Signed-off-by: Keiichi Watanabe <keiichiw@chromium.org>
---
 lib/librte_vhost/rte_vhost.h | 15 +++++++++++++++
 lib/librte_vhost/version.map |  1 +
 lib/librte_vhost/vhost.c     | 14 ++++++++++++++
 3 files changed, 30 insertions(+)

diff --git a/lib/librte_vhost/rte_vhost.h b/lib/librte_vhost/rte_vhost.h
index 010f16086..d0a8ae31f 100644
--- a/lib/librte_vhost/rte_vhost.h
+++ b/lib/librte_vhost/rte_vhost.h
@@ -567,6 +567,21 @@ rte_vhost_driver_get_queue_num(const char *path, uint32_t *queue_num);
  */
 int rte_vhost_get_negotiated_features(int vid, uint64_t *features);
 
+/**
+ * Get the protocol feature bits after negotiation
+ *
+ * @param vid
+ *  Vhost device ID
+ * @param protocol_features
+ *  A pointer to store the queried protocol feature bits
+ * @return
+ *  0 on success, -1 on failure
+ */
+__rte_experimental
+int
+rte_vhost_get_negotiated_protocol_features(int vid,
+					   uint64_t *protocol_features);
+
 /* Register callbacks. */
 int rte_vhost_driver_callback_register(const char *path,
 	struct vhost_device_ops const * const ops);
diff --git a/lib/librte_vhost/version.map b/lib/librte_vhost/version.map
index 9183d6f2f..95c4c0990 100644
--- a/lib/librte_vhost/version.map
+++ b/lib/librte_vhost/version.map
@@ -63,6 +63,7 @@ EXPERIMENTAL {
 	rte_vhost_va_from_guest_pa;
 	rte_vhost_extern_callback_register;
 	rte_vhost_driver_set_protocol_features;
+	rte_vhost_get_negotiated_protocol_features;
 	rte_vhost_set_inflight_desc_split;
 	rte_vhost_set_inflight_desc_packed;
 	rte_vhost_set_last_inflight_io_split;
diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index b83cf639e..c43248e4b 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -868,6 +868,20 @@ rte_vhost_get_negotiated_features(int vid, uint64_t *features)
 	return 0;
 }
 
+int
+rte_vhost_get_negotiated_protocol_features(int vid,
+					   uint64_t *protocol_features)
+{
+	struct virtio_net *dev;
+
+	dev = get_device(vid);
+	if (dev == NULL || protocol_features == NULL)
+		return -1;
+
+	*protocol_features = dev->protocol_features;
+	return 0;
+}
+
 int
 rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
 {
-- 
2.31.0.rc2.261.g7f71774620-goog