From: Keiichi Watanabe <keiichiw@chromium.org>
Date: Mon, 22 Mar 2021 07:22:56 +0000 (+0900)
Subject: vhost: get negotiated protocol features
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=790b1c3171110df4a70b1903a30bae90c57dec57;p=dpdk.git

vhost: get negotiated protocol features

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

Signed-off-by: Keiichi Watanabe <keiichiw@chromium.org>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---

diff --git a/lib/librte_vhost/rte_vhost.h b/lib/librte_vhost/rte_vhost.h
index 010f160869..d0a8ae31f2 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 9183d6f2fc..9103a23cd4 100644
--- a/lib/librte_vhost/version.map
+++ b/lib/librte_vhost/version.map
@@ -76,4 +76,7 @@ EXPERIMENTAL {
 	rte_vhost_async_channel_unregister;
 	rte_vhost_submit_enqueue_burst;
 	rte_vhost_poll_enqueue_completed;
+
+	# added in 21.05
+	rte_vhost_get_negotiated_protocol_features;
 };
diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index 04d63b2f02..c9d1371e45 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -885,6 +885,20 @@ 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)
 {