[dpdk-dev] [PATCH v4 06/22] vhost: introduce API to fetch negotiated features

Yuanhan Liu yuanhan.liu at linux.intel.com
Sat Apr 1 09:22:44 CEST 2017


Signed-off-by: Yuanhan Liu <yuanhan.liu at linux.intel.com>
---

v4: use parameter to store the returned features and return -1 on error
---
 lib/librte_vhost/rte_vhost_version.map |  1 +
 lib/librte_vhost/rte_virtio_net.h      | 12 ++++++++++++
 lib/librte_vhost/vhost.c               | 13 +++++++++++++
 3 files changed, 26 insertions(+)

diff --git a/lib/librte_vhost/rte_vhost_version.map b/lib/librte_vhost/rte_vhost_version.map
index 664a5f3..cec1e9e 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 8c1c172..c6fba0b 100644
--- a/lib/librte_vhost/rte_virtio_net.h
+++ b/lib/librte_vhost/rte_virtio_net.h
@@ -156,6 +156,18 @@ struct virtio_net_device_ops {
  */
 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 2b41652..90b0f67 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -360,6 +360,19 @@ struct virtio_net *
 }
 
 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)
 {
 	struct virtio_net *dev;
-- 
1.9.0



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