vswitch: Factor out detection of internal interfaces into a new function.

The following commit needs to use this same logic, so break it out into
a function to avoid redundancy.

diff --git a/vswitchd/bridge.c b/vswitchd/bridge.c
index b525f3d6d117029af825c97097bda2f37adee312..2d788ae0d17300a90025604d423f97dbb887acd3 100644 (file)
--- a/vswitchd/bridge.c
+++ b/vswitchd/bridge.c
@@ -242,6 +242,7 @@ static void iface_destroy(struct iface *);
 static struct iface *iface_lookup(const struct bridge *, const char *name);
 static struct iface *iface_from_dp_ifidx(const struct bridge *,
                                          uint16_t dp_ifidx);
+static bool iface_is_internal(const struct bridge *, const char *name);
 
 /* Hooks into ofproto processing. */
 static struct ofhooks bridge_ofhooks;
@@ -464,18 +465,8 @@ bridge_reconfigure(void)
                 bool internal;
                 int error;
 
-                /* It's an internal interface if it's marked that way, or if
-                 * it's a bonded interface for which we're faking up a network
-                 * device. */
-                internal = cfg_get_bool(0, "iface.%s.internal", if_name);
-                if (cfg_get_bool(0, "bonding.%s.fake-iface", if_name)) {
-                    struct port *port = port_lookup(br, if_name);
-                    if (port && port->n_ifaces > 1) {
-                        internal = true;
-                    }
-                }
-
                 /* Add to datapath. */
+                internal = iface_is_internal(br, if_name);
                 error = dpif_port_add(&br->dpif, if_name, next_port_no++,
                                       internal ? ODP_PORT_INTERNAL : 0);
                 if (error != EEXIST) {
@@ -3116,6 +3107,34 @@ iface_from_dp_ifidx(const struct bridge *br, uint16_t dp_ifidx)
 {
     return port_array_get(&br->ifaces, dp_ifidx);
 }
+
+/* Returns true if 'iface' is the name of an "internal" interface on bridge
+ * 'br', that is, an interface that is entirely simulated within the datapath.
+ * The local port (ODPP_LOCAL) is always an internal interface.  Other local
+ * interfaces are created by setting "iface.<iface>.internal = true".
+ *
+ * In addition, we have a kluge-y feature that creates an internal port with
+ * the name of a bonded port if "bonding.<bondname>.fake-iface = true" is set.
+ * This feature needs to go away in the long term.  Until then, this is one
+ * reason why this function takes a name instead of a struct iface: the fake
+ * interfaces created this way do not have a struct iface. */
+static bool
+iface_is_internal(const struct bridge *br, const char *iface)
+{
+    if (!strcmp(iface, br->name)
+        || cfg_get_bool(0, "iface.%s.internal", iface)) {
+        return true;
+    }
+
+    if (cfg_get_bool(0, "bonding.%s.fake-iface", iface)) {
+        struct port *port = port_lookup(br, iface);
+        if (port && port->n_ifaces > 1) {
+            return true;
+        }
+    }
+
+    return false;
+}
 \f
 /* Port mirroring. */