From 84b32864207813c5f4b9989f66303a577cb01ba0 Mon Sep 17 00:00:00 2001
From: Ethan Jackson <ethan@nicira.com>
Date: Mon, 25 Apr 2011 16:06:54 -0700
Subject: [PATCH] bridge: Create new "null" interface type.

Null interfaces are completely ignored by Open vSwitch.
---
 vswitchd/bridge.c    | 21 +++++++++++++--------
 vswitchd/vswitch.xml |  2 ++
 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/vswitchd/bridge.c b/vswitchd/bridge.c
index 20ecca356..84ed03e80 100644
--- a/vswitchd/bridge.c
+++ b/vswitchd/bridge.c
@@ -2951,12 +2951,12 @@ port_reconfigure(struct port *port, const struct ovsrec_port *cfg)
 
     port->cfg = cfg;
 
-
     /* Add new interfaces and update 'cfg' member of existing ones. */
     sset_init(&new_ifaces);
     for (i = 0; i < cfg->n_interfaces; i++) {
         const struct ovsrec_interface *if_cfg = cfg->interfaces[i];
         struct iface *iface;
+        const char *type;
 
         if (!sset_add(&new_ifaces, if_cfg->name)) {
             VLOG_WARN("port %s: %s specified twice as port interface",
@@ -2965,8 +2965,18 @@ port_reconfigure(struct port *port, const struct ovsrec_port *cfg)
             continue;
         }
 
+        /* Determine interface type.  The local port always has type
+         * "internal".  Other ports take their type from the database and
+         * default to "system" if none is specified. */
+        type = (!strcmp(if_cfg->name, port->bridge->name) ? "internal"
+                : if_cfg->type[0] ? if_cfg->type
+                : "system");
+
         iface = iface_lookup(port->bridge, if_cfg->name);
-        if (iface) {
+        if (!strcmp(type, "null")) {
+            iface_destroy(iface);
+            continue;
+        } else if (iface) {
             if (iface->port != port) {
                 VLOG_ERR("bridge %s: %s interface is on multiple ports, "
                          "removing from %s",
@@ -2978,12 +2988,7 @@ port_reconfigure(struct port *port, const struct ovsrec_port *cfg)
             iface = iface_create(port, if_cfg);
         }
 
-        /* Determine interface type.  The local port always has type
-         * "internal".  Other ports take their type from the database and
-         * default to "system" if none is specified. */
-        iface->type = (!strcmp(if_cfg->name, port->bridge->name) ? "internal"
-                       : if_cfg->type[0] ? if_cfg->type
-                       : "system");
+        iface->type = type;
     }
     sset_destroy(&new_ifaces);
 
diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml
index 4cdc1b1ca..ce00cbd70 100644
--- a/vswitchd/vswitch.xml
+++ b/vswitchd/vswitch.xml
@@ -1047,6 +1047,8 @@
               </dd>
             </dl>
           </dd>
+          <dt><code>null</code></dt>
+          <dd>An ignored interface.</dd>
         </dl>
       </column>
 
-- 
2.43.0