From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Date: Sat, 1 Apr 2017 07:22:44 +0000 (+0800)
Subject: vhost: introduce API to fetch negotiated features
X-Git-Tag: spdx-start~3894
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=ca33faf9ef108d753b8b6367430521ce62cb7425;p=dpdk.git

vhost: introduce API to fetch negotiated features

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---

diff --git a/lib/librte_vhost/rte_vhost_version.map b/lib/librte_vhost/rte_vhost_version.map
index 664a5f3812..cec1e9eec5 100644
--- a/lib/librte_vhost/rte_vhost_version.map
+++ b/lib/librte_vhost/rte_vhost_version.map
@@ -37,5 +37,6 @@ DPDK_17.05 {
 	rte_vhost_driver_set_features;
 	rte_vhost_get_mem_table;
 	rte_vhost_get_mtu;
+	rte_vhost_get_negotiated_features;
 
 } DPDK_16.07;
diff --git a/lib/librte_vhost/rte_virtio_net.h b/lib/librte_vhost/rte_virtio_net.h
index 788326696f..e3655974f5 100644
--- a/lib/librte_vhost/rte_virtio_net.h
+++ b/lib/librte_vhost/rte_virtio_net.h
@@ -158,6 +158,18 @@ int rte_vhost_driver_disable_features(const char *path, uint64_t features);
  */
 int rte_vhost_driver_get_features(const char *path, uint64_t *features);
 
+/**
+ * Get the feature bits after negotiation
+ *
+ * @param vid
+ *  Vhost device ID
+ * @param features
+ *  A pointer to store the queried feature bits
+ * @return
+ *  0 on success, -1 on failure
+ */
+int rte_vhost_get_negotiated_features(int vid, uint64_t *features);
+
 /* Register callbacks. */
 int rte_vhost_driver_callback_register(const char *path,
 	struct virtio_net_device_ops const * const ops);
diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index 2b41652f70..90b0f67492 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -359,6 +359,19 @@ rte_vhost_get_ifname(int vid, char *buf, size_t len)
 	return 0;
 }
 
+int
+rte_vhost_get_negotiated_features(int vid, uint64_t *features)
+{
+	struct virtio_net *dev;
+
+	dev = get_device(vid);
+	if (!dev)
+		return -1;
+
+	*features = dev->features;
+	return 0;
+}
+
 int
 rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
 {