datapath: Hardcode vport multicast group ID on older kernels.

[sliver-openvswitch.git] / datapath / linux / compat / genetlink.inc

diff --git a/datapath/linux/compat/genetlink.inc b/datapath/linux/compat/genetlink.inc
index d381e4f..9e7d90d 100644 (file)
--- a/datapath/linux/compat/genetlink.inc
+++ b/datapath/linux/compat/genetlink.inc
@@ -6,6 +6,9 @@
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
 #include <linux/mutex.h>
 
+#include "openvswitch/datapath-compat.h"
+#include "openvswitch/datapath-protocol.h"
+
 static DEFINE_MUTEX(mc_group_mutex);
 
 int genl_register_mc_group(struct genl_family *family,
@@ -13,9 +16,15 @@ int genl_register_mc_group(struct genl_family *family,
 {
        static int next_group = GENL_FIRST_MCGROUP;
 
+       grp->family = family;
+
+       if (!strcmp(grp->name, OVS_VPORT_MCGROUP)) {
+               grp->id = OVS_VPORT_MCGROUP_FALLBACK_ID;
+               return 0;
+       }
+
        mutex_lock(&mc_group_mutex);
        grp->id = next_group;
-       grp->family = family;
 
        if (++next_group > GENL_LAST_MCGROUP)
                next_group = GENL_FIRST_MCGROUP;