xenserver: Delete ports by interface name.

ovs-vsctl command "--if-exists del-port eth0" does nothing if eth0 is on
a bridge as part of a bond, because the bond's port name is not eth0 but
something else.  But interface-reconfigure needs to do that, so this commit
adds that ability to ovs-vsctl and modifies interface-reconfigure to use it.

Signed-off-by: Ben Pfaff <blp@nicira.com>

utilities/ovs-vsctl.8.in

@@ -256,6 +256,17 @@ Without \fB\-\-if\-exists\fR, attempting to delete a port that does
 not exist is an error.  With \fB\-\-if\-exists\fR, attempting to
 delete a port that does not exist has no effect.
 .
+.IP "[\fB\-\-if\-exists\fR] \fB\-\-with\-iface del\-port \fR[\fIbridge\fR] \fIiface\fR"
+Deletes the port named \fIiface\fR or that has an interface named
+\fIiface\fR.  If \fIbridge\fR is omitted, the port is removed from
+whatever bridge contains it; if \fIbridge\fR is specified, it must be
+the real or fake bridge that contains the port.
+.IP
+Without \fB\-\-if\-exists\fR, attempting to delete the port for an
+interface that does not exist is an error.  With \fB\-\-if\-exists\fR,
+attempting to delete the port for an interface that does not exist has
+no effect.
+.
 .IP "\fBport\-to\-br \fIport\fR"
 Prints the name of the bridge that contains \fIport\fR on standard
 output.

utilities/ovs-vsctl.c

@@ -1277,31 +1277,50 @@ static void
 cmd_del_port(struct vsctl_context *ctx)
 {
     bool must_exist = !shash_find(&ctx->options, "--if-exists");
+    bool with_iface = shash_find(&ctx->options, "--with-iface") != NULL;
+    struct vsctl_port *port;
     struct vsctl_info info;
 
     get_info(ctx->ovs, &info);
-    if (ctx->argc == 2) {
-        struct vsctl_port *port = find_port(&info, ctx->argv[1], must_exist);
-        if (port) {
-            del_port(&info, port);
+    if (!with_iface) {
+        port = find_port(&info, ctx->argv[ctx->argc - 1], must_exist);
+    } else {
+        const char *target = ctx->argv[ctx->argc - 1];
+        struct vsctl_iface *iface;
+
+        port = find_port(&info, target, false);
+        if (!port) {
+            iface = find_iface(&info, target, false);
+            if (iface) {
+                port = iface->port;
+            }
+        }
+        if (must_exist && !port) {
+            vsctl_fatal("no port or interface named %s", target);
+        }
     }
-    } else if (ctx->argc == 3) {
-        struct vsctl_bridge *bridge = find_bridge(&info, ctx->argv[1], true);
-        struct vsctl_port *port = find_port(&info, ctx->argv[2], must_exist);
 
     if (port) {
-            if (port->bridge == bridge) {
-                del_port(&info, port);
-            } else if (port->bridge->parent == bridge) {
-                vsctl_fatal("bridge %s does not have a port %s (although its "
-                            "parent bridge %s does)",
-                            ctx->argv[1], ctx->argv[2], bridge->parent->name);
+        if (ctx->argc == 3) {
+            struct vsctl_bridge *bridge;
+
+            bridge = find_bridge(&info, ctx->argv[1], true);
+            if (port->bridge != bridge) {
+                if (port->bridge->parent == bridge) {
+                    vsctl_fatal("bridge %s does not have a port %s (although "
+                                "its parent bridge %s does)",
+                                ctx->argv[1], ctx->argv[2],
+                                bridge->parent->name);
                 } else {
                     vsctl_fatal("bridge %s does not have a port %s",
                                 ctx->argv[1], ctx->argv[2]);
                 }
             }
         }
+
+        del_port(&info, port);
+    }
+
     free_info(&info);
 }
 
@@ -2484,7 +2503,7 @@ static const struct vsctl_command_syntax all_commands[] = {
     {"list-ports", 1, 1, cmd_list_ports, NULL, ""},
     {"add-port", 2, 2, cmd_add_port, NULL, "--may-exist"},
     {"add-bond", 4, INT_MAX, cmd_add_bond, NULL, "--may-exist,--fake-iface"},
-    {"del-port", 1, 2, cmd_del_port, NULL, "--if-exists"},
+    {"del-port", 1, 2, cmd_del_port, NULL, "--if-exists,--with-iface"},
     {"port-to-br", 1, 1, cmd_port_to_br, NULL, ""},
 
     /* Interface commands. */

xenserver/opt_xensource_libexec_InterfaceReconfigureVswitch.py

@@ -119,7 +119,7 @@ A VLAN PIF cannot be a datapath PIF.
         return [pif]
 
 def datapath_deconfigure_physical(netdev):
-    return ['--', '--if-exists', 'del-port', netdev]
+    return ['--', '--with-iface', '--if-exists', 'del-port', netdev]
 
 def datapath_configure_bond(pif,slaves):
     bridge = pif_bridge_name(pif)
@@ -156,10 +156,10 @@ def datapath_configure_bond(pif,slaves):
     return argv
 
 def datapath_deconfigure_bond(netdev):
-    return ['--', '--if-exists', 'del-port', netdev]
+    return ['--', '--with-iface', '--if-exists', 'del-port', netdev]
 
 def datapath_deconfigure_ipdev(interface):
-    return ['--', '--if-exists', 'del-port', interface]
+    return ['--', '--with-iface', '--if-exists', 'del-port', interface]
 
 def datapath_modify_config(commands):
     #log("modifying configuration:")