Distributed Virtual Router Support

A distributed virtual router works by attmpeting to switch a packet, but on failing to find a local consumer (i.e. the packet is destined to a locally attached host) then the packet is sent unmodified 'upstream' to where the rest of the 'distributed' router is present. When L3 switching a packet this means the L2 header must not be modifed. This patch adds a 'l2-bridge' object to the L3 FIB which re-injects packets from the L3 path back into the L2 path - use with extreme caution.

Change-Id: I069724eb45956647d7980cbe40a80a788ee6ee82
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/src/vnet/dpo/l2_bridge_dpo.h b/src/vnet/dpo/l2_bridge_dpo.h
new file mode 100644
index 00000000000..0a20dd79335
--- /dev/null
+++ b/src/vnet/dpo/l2_bridge_dpo.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __L2_BRIDGE_DPO_H__
+#define __L2_BRIDGE_DPO_H__
+
+#include <vnet/dpo/dpo.h>
+
+/**
+ * @brief
+ * The data-path object representing an L2 bridge.
+ * If a packet encounters an object of this type in the L3 data-path, it
+ * is injected back into the L2 bridge.
+ */
+typedef struct l2_bridge_dpo_t_
+{
+    /**
+     * The Software interface index that the packets will output on
+     */
+    u32 l2b_sw_if_index;
+
+    /**
+     * number of locks.
+     */
+    u16 l2b_locks;
+} l2_bridge_dpo_t;
+
+extern void l2_bridge_dpo_add_or_lock (u32 sw_if_index,
+                                       dpo_id_t *dpo);
+
+extern void l2_bridge_dpo_module_init(void);
+
+/**
+ * @brief pool of all interface DPOs
+ */
+l2_bridge_dpo_t *l2_bridge_dpo_pool;
+
+static inline l2_bridge_dpo_t *
+l2_bridge_dpo_get (index_t index)
+{
+    return (pool_elt_at_index(l2_bridge_dpo_pool, index));
+}
+
+#endif