vnet: create L2 feature arc infrastructure

This commit adds two new nodes in the L2
datapath in input and output direction respectively.

These nodes fork the traffic into three feature
arcs: ip4, ip6 and nonip, which later join
to continue the usual L2 processing.
The vnet_l2_feature_enable_disable() function
with the same signature as
vnet_feature_enable_disable() takes care of
enabling the L2 datapath feature bits as needed, when
the features are enabled/disabled.

Thus, L2 features may use the similar plumbing as
the L3 features enjoy.

Change-Id: I76877b3a92d794c492bff1622bb26acba05705b2
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>

1 files changed, 71 insertions, 0 deletions

diff --git a/src/vnet/l2/l2_in_out_feat_arc.h b/src/vnet/l2/l2_in_out_feat_arc.h
new file mode 100644
index 00000000000..799edee7929
--- /dev/null
+++ b/src/vnet/l2/l2_in_out_feat_arc.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2015 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 __included_vnet_in_out_feat_arc_h__
+#define __included_vnet_in_out_feat_arc_h__
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/classify/vnet_classify.h>
+
+typedef enum
+{
+  FEAT_ARC_NEXT_INDEX_DROP,
+  FEAT_ARC_NEXT_INDEX_N_NEXT,
+} in_out_feat_arc_next_index_t;
+
+typedef enum
+{
+  IN_OUT_FEAT_ARC_TABLE_IP4,
+  IN_OUT_FEAT_ARC_TABLE_IP6,
+  IN_OUT_FEAT_ARC_TABLE_L2,
+  IN_OUT_FEAT_ARC_N_TABLES,
+} in_out_feat_arc_table_id_t;
+
+typedef enum
+{
+  IN_OUT_FEAT_ARC_INPUT_TABLE_GROUP,
+  IN_OUT_FEAT_ARC_OUTPUT_TABLE_GROUP,
+  IN_OUT_FEAT_ARC_N_TABLE_GROUPS
+} in_out_feat_arc_table_group_id_t;
+
+typedef struct
+{
+  /* convenience variables */
+  vlib_main_t *vlib_main;
+  vnet_main_t *vnet_main;
+  vnet_classify_main_t *vnet_classify_main;
+    vnet_config_main_t
+    *
+    vnet_config_main[IN_OUT_FEAT_ARC_N_TABLE_GROUPS]
+    [IN_OUT_FEAT_ARC_N_TABLES];
+} in_out_feat_arc_main_t;
+
+int vnet_l2_feature_enable_disable (const char *arc_name,
+				    const char *node_name, u32 sw_if_index,
+				    int enable_disable, void *feature_config,
+				    u32 n_feature_config_bytes);
+
+
+
+#endif /* __included_vnet_in_out_feat_arc_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */