net: Add Open vSwitch kernel components.

Open vSwitch is a multilayer Ethernet switch targeted at virtualized
environments.  In addition to supporting a variety of features
expected in a traditional hardware switch, it enables fine-grained
programmatic extension and flow-based control of the network.
This control is useful in a wide variety of applications but is
particularly important in multi-server virtualization deployments,
which are often characterized by highly dynamic endpoints and the need
to maintain logical abstractions for multiple tenants.

The Open vSwitch datapath provides an in-kernel fast path for packet
forwarding.  It is complemented by a userspace daemon, ovs-vswitchd,
which is able to accept configuration from a variety of sources and
translate it into packet processing rules.

See http://openvswitch.org for more information and userspace
utilities.

Signed-off-by: Jesse Gross <jesse@nicira.com>

1 files changed, 66 insertions, 0 deletions

diff --git a/net/openvswitch/dp_notify.c b/net/openvswitch/dp_notify.c
new file mode 100644
index 000000000000..46736518c453
--- /dev/null
+++ b/net/openvswitch/dp_notify.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2007-2011 Nicira Networks.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#include <linux/netdevice.h>
+#include <net/genetlink.h>
+
+#include "datapath.h"
+#include "vport-internal_dev.h"
+#include "vport-netdev.h"
+
+static int dp_device_event(struct notifier_block *unused, unsigned long event,
+                           void *ptr)
+{
+        struct net_device *dev = ptr;
+        struct vport *vport;
+
+        if (ovs_is_internal_dev(dev))
+                vport = ovs_internal_dev_get_vport(dev);
+        else
+                vport = ovs_netdev_get_vport(dev);
+
+        if (!vport)
+                return NOTIFY_DONE;
+
+        switch (event) {
+        case NETDEV_UNREGISTER:
+                if (!ovs_is_internal_dev(dev)) {
+                        struct sk_buff *notify;
+
+                        notify = ovs_vport_cmd_build_info(vport, 0, 0,
+                                                          OVS_VPORT_CMD_DEL);
+                        ovs_dp_detach_port(vport);
+                        if (IS_ERR(notify)) {
+                                netlink_set_err(init_net.genl_sock, 0,
+                                                ovs_dp_vport_multicast_group.id,
+                                                PTR_ERR(notify));
+                                break;
+                        }
+
+                        genlmsg_multicast(notify, 0, ovs_dp_vport_multicast_group.id,
+                                          GFP_KERNEL);
+                }
+                break;
+        }
+
+        return NOTIFY_DONE;
+}
+
+struct notifier_block ovs_dp_device_notifier = {
+        .notifier_call = dp_device_event
+};