vhost: introduce driver features related APIs

[dpdk.git] / lib / librte_vhost / socket.c

diff --git a/lib/librte_vhost/socket.c b/lib/librte_vhost/socket.c
index 2afde98..53663f4 100644 (file)
--- a/lib/librte_vhost/socket.c
+++ b/lib/librte_vhost/socket.c
@@ -67,6 +67,16 @@ struct vhost_user_socket {
        bool is_server;
        bool reconnect;
        bool dequeue_zero_copy;
+
+       /*
+        * The "supported_features" indicates the feature bits the
+        * vhost driver supports. The "features" indicates the feature
+        * bits after the rte_vhost_driver_features_disable/enable().
+        * It is also the final feature bits used for vhost-user
+        * features negotiation.
+        */
+       uint64_t supported_features;
+       uint64_t features;
 };
 
 struct vhost_user_connection {
@@ -490,6 +500,88 @@ vhost_user_create_client(struct vhost_user_socket *vsocket)
        return 0;
 }
 
+static struct vhost_user_socket *
+find_vhost_user_socket(const char *path)
+{
+       int i;
+
+       for (i = 0; i < vhost_user.vsocket_cnt; i++) {
+               struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
+
+               if (!strcmp(vsocket->path, path))
+                       return vsocket;
+       }
+
+       return NULL;
+}
+
+int
+rte_vhost_driver_disable_features(const char *path, uint64_t features)
+{
+       struct vhost_user_socket *vsocket;
+
+       pthread_mutex_lock(&vhost_user.mutex);
+       vsocket = find_vhost_user_socket(path);
+       if (vsocket)
+               vsocket->features &= ~features;
+       pthread_mutex_unlock(&vhost_user.mutex);
+
+       return vsocket ? 0 : -1;
+}
+
+int
+rte_vhost_driver_enable_features(const char *path, uint64_t features)
+{
+       struct vhost_user_socket *vsocket;
+
+       pthread_mutex_lock(&vhost_user.mutex);
+       vsocket = find_vhost_user_socket(path);
+       if (vsocket) {
+               if ((vsocket->supported_features & features) != features) {
+                       /*
+                        * trying to enable features the driver doesn't
+                        * support.
+                        */
+                       pthread_mutex_unlock(&vhost_user.mutex);
+                       return -1;
+               }
+               vsocket->features |= features;
+       }
+       pthread_mutex_unlock(&vhost_user.mutex);
+
+       return vsocket ? 0 : -1;
+}
+
+int
+rte_vhost_driver_set_features(const char *path, uint64_t features)
+{
+       struct vhost_user_socket *vsocket;
+
+       pthread_mutex_lock(&vhost_user.mutex);
+       vsocket = find_vhost_user_socket(path);
+       if (vsocket) {
+               vsocket->supported_features = features;
+               vsocket->features = features;
+       }
+       pthread_mutex_unlock(&vhost_user.mutex);
+
+       return vsocket ? 0 : -1;
+}
+
+int
+rte_vhost_driver_get_features(const char *path, uint64_t *features)
+{
+       struct vhost_user_socket *vsocket;
+
+       pthread_mutex_lock(&vhost_user.mutex);
+       vsocket = find_vhost_user_socket(path);
+       if (vsocket)
+               *features = vsocket->features;
+       pthread_mutex_unlock(&vhost_user.mutex);
+
+       return vsocket ? 0 : -1;
+}
+
 /*
  * Register a new vhost-user socket; here we could act as server
  * (the default case), or client (when RTE_VHOST_USER_CLIENT) flag