mdata: buffer metadata change tracker plugin

A handy tool in case you need to know which metadata will be changed
when a packet visits a certain node.

Reflect metadata changes into format functions used by the
vpp-specific wireshark dissector.

Type: feature

Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: I96fe8a24db4082bb29fe2a33cc522e8616a3a1bb

1 files changed, 80 insertions, 0 deletions

diff --git a/src/plugins/mdata/mdata_test.c b/src/plugins/mdata/mdata_test.c
new file mode 100644
index 00000000000..57ec6846655
--- /dev/null
+++ b/src/plugins/mdata/mdata_test.c
@@ -0,0 +1,80 @@
+/*
+ * mdata.c - buffer metadata change tracker vpp-api-test plug-in
+ *
+ * Copyright (c) 2019 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.
+ */
+#include <vat/vat.h>
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <vppinfra/error.h>
+#include <stdbool.h>
+
+#define __plugin_msg_base mdata_test_main.msg_id_base
+#include <vlibapi/vat_helper_macros.h>
+
+/* Declare message IDs */
+#include <mdata/mdata.api_enum.h>
+#include <mdata/mdata.api_types.h>
+
+typedef struct
+{
+  /* API message ID base */
+  u16 msg_id_base;
+  vat_main_t *vat_main;
+} mdata_test_main_t;
+
+mdata_test_main_t mdata_test_main;
+
+static int
+api_mdata_enable_disable (vat_main_t * vam)
+{
+  unformat_input_t *i = vam->input;
+  int enable_disable = 1;
+  vl_api_mdata_enable_disable_t *mp;
+  int ret;
+
+  /* Parse args required to build the message */
+  while (unformat_check_input (i) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (i, "disable"))
+	enable_disable = 0;
+      else
+	break;
+    }
+
+  /* Construct the API message */
+  M (MDATA_ENABLE_DISABLE, mp);
+  mp->enable_disable = enable_disable;
+
+  /* send it... */
+  S (mp);
+
+  /* Wait for a reply... */
+  W (ret);
+  return ret;
+}
+
+/*
+ * List of messages that the mdata test plugin sends,
+ * and that the data plane plugin processes
+ */
+#include <mdata/mdata.api_test.c>
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */