From da3db88f3a7993a8e2a118542704e0babbe93fac Mon Sep 17 00:00:00 2001
From: Simon Horman <horms@verge.net.au>
Date: Wed, 7 Sep 2011 10:10:30 +0900
Subject: [PATCH] ovs-ctl: Add load-kmod command

On Debian there is a need for the init scripts to die gracefully
if module insertion fails. In such a case it is desirable to print
some sort of informative message.

By adding the load-kmod sub-command to ovs-ctl init scripts
may try to load modules and take appropriate action on failure
or then try to start the daemons.
---
 utilities/ovs-ctl.8  | 18 ++++++++++++++++++
 utilities/ovs-ctl.in | 18 +++++++++++++-----
 2 files changed, 31 insertions(+), 5 deletions(-)

diff --git a/utilities/ovs-ctl.8 b/utilities/ovs-ctl.8
index 8d8088ad..0e411620 100644
--- a/utilities/ovs-ctl.8
+++ b/utilities/ovs-ctl.8
@@ -27,6 +27,10 @@ ovs\-ctl \- OVS startup helper script
 \fBovs\-ctl version
 .br
 \fBovs\-ctl
+[\fIoptions\fR]
+\fBload\-kmod\fR
+.br
+\fBovs\-ctl
 \fB\-\-system\-id=random\fR|\fIuuid\fR
 [\fIoptions\fR]
 \fBforce\-reload\-kmod\fR
@@ -263,6 +267,20 @@ have to be restarted after completing the above procedure.
 \fBforce\-kmod\-reload\fR internally stops and starts OVS, so it
 accepts all of the options accepted by the \fBstart\fR command.
 .
+.SH "The ``load\-kmod'' command"
+.
+.PP
+The \fBload\-kmod\fR command loads the openvswitch kernel modules if
+they are not already loaded. This operation also occurs as part of
+the \fBstart\fR command. The motivation for providing the \fBload\-kmod\fR
+command is to allow errors when loading modules to be handled separatetly
+from other errors that may occur when running the \fBstart\fR command.
+.
+.PP
+By default the \fBload\-kmod\fR command attempts to load the
+openvswitch_mod kernel module. If the \fB\-\-brcompat\fR option is
+specified then the brcompat_mod kernel module is also loaded.
+.
 .SH "The ``enable\-protocol'' command"
 .
 .PP
diff --git a/utilities/ovs-ctl.in b/utilities/ovs-ctl.in
index c1024190..8788e4a3 100755
--- a/utilities/ovs-ctl.in
+++ b/utilities/ovs-ctl.in
@@ -56,6 +56,13 @@ insert_brcompat_mod_if_required () {
     action "Inserting brcompat module" modprobe brcompat_mod
 }
 
+insert_mod_if_required () {
+    insert_openvswitch_mod_if_required || return 1
+    if test X"$BRCOMPAT" = Xyes; then
+        insert_brcompat_mod_if_required || return 1
+    fi
+}
+
 ovs_vsctl () {
     ovs-vsctl --no-wait --timeout=5 "$@"
 }
@@ -160,10 +167,7 @@ start () {
         ulimit -Sc 67108864
     fi
 
-    insert_openvswitch_mod_if_required || return 1
-    if test X"$BRCOMPAT" = Xyes; then
-        insert_brcompat_mod_if_required || return 1
-    fi
+    insert_mod_if_required || return 1
 
     if daemon_is_running ovsdb-server; then
 	log_success_msg "ovsdb-server is already running"
@@ -394,6 +398,7 @@ Commands:
   stop               stop Open vSwitch daemons
   status             check whether Open vSwitch daemons are running
   version            print versions of Open vSwitch daemons
+  load-kmod          insert modules if not already present
   force-reload-kmod  save OVS network device state, stop OVS, unload kernel
                      module, reload kernel module, start OVS, restore state
   enable-protocol    enable protocol specified in options with iptables
@@ -418,7 +423,7 @@ Less important options for "start" and "force-reload-kmod":
   --ovs-vswitchd-priority=NICE   set ovs-vswitchd's niceness (default: $OVS_VSWITCHD_PRIORITY)
   --ovs-brcompatd-priority=NICE  set ovs-brcompatd's niceness (default: $OVS_BRCOMPATD_PRIORITY)
 
-Options for "start", "force-reload-kmod", "status", and "version":
+Options for "start", "force-reload-kmod", "load-kmod", "status", and "version":
   --brcompat         enable Linux bridge compatibility module and daemon
 
 File location options:
@@ -548,6 +553,9 @@ case $command in
     force-reload-kmod)
 	force_reload_kmod
         ;;
+    load-kmod)
+        insert_mod_if_required
+        ;;
     enable-protocol)
         enable_protocol
         ;;
-- 
2.30.2