Add 'show vlib graphviz' command

Add a new command to dump vlib graph as graphviz/dot file

Change-Id: I43fc072cff8153ac500e5fbc6641a3705c2e995e
Signed-off-by: Benoît Ganne <bganne@cisco.com>

1 files changed, 78 insertions, 0 deletions

diff --git a/src/vlib/node_cli.c b/src/vlib/node_cli.c
index ad17c1d6f4d..c8e32b58a69 100644
--- a/src/vlib/node_cli.c
+++ b/src/vlib/node_cli.c
@@ -37,6 +37,9 @@
  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <vlib/vlib.h>
 #include <vlib/threads.h>
 
@@ -88,6 +91,81 @@ VLIB_CLI_COMMAND (show_node_graph_command, static) = {
 };
 /* *INDENT-ON* */
 
+static clib_error_t *
+show_node_graphviz (vlib_main_t * vm,
+		    unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  clib_error_t *error = 0;
+  vlib_node_main_t *nm = &vm->node_main;
+  u8 *chroot_filename = 0;
+  int fd;
+  vlib_node_t **nodes = 0;
+  uword i, j;
+
+  if (!unformat_user (input, unformat_vlib_tmpfile, &chroot_filename))
+    {
+      fd = -1;
+    }
+  else
+    {
+      fd =
+	open ((char *) chroot_filename, O_CREAT | O_TRUNC | O_WRONLY, 0664);
+    }
+
+#define format__(vm__, fd__, ...) \
+  if ((fd) < 0) \
+    { \
+      vlib_cli_output((vm__), ## __VA_ARGS__); \
+    } \
+  else \
+    { \
+      fdformat((fd__), ## __VA_ARGS__); \
+    }
+
+  format__ (vm, fd, "%s", "digraph {\n");
+
+  nodes = vec_dup (nm->nodes);
+  vec_sort_with_function (nodes, node_cmp);
+
+  for (i = 0; i < vec_len (nodes); i++)
+    {
+      for (j = 0; j < vec_len (nodes[i]->next_nodes); j++)
+	{
+	  vlib_node_t *x;
+
+	  if (nodes[i]->next_nodes[j] == VLIB_INVALID_NODE_INDEX)
+	    continue;
+
+	  x = vec_elt (nm->nodes, nodes[i]->next_nodes[j]);
+	  format__ (vm, fd, "  \"%v\" -> \"%v\"\n", nodes[i]->name, x->name);
+	}
+    }
+
+  format__ (vm, fd, "%s", "}");
+
+  if (fd >= 0)
+    {
+      vlib_cli_output (vm,
+		       "vlib graph dumped into `%s'. Run eg. `fdp -Tsvg -O %s'.",
+		       chroot_filename, chroot_filename);
+    }
+
+  vec_free (nodes);
+  vec_free (chroot_filename);
+  vec_free (nodes);
+  if (fd >= 0)
+    close (fd);
+  return error;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_node_graphviz_command, static) = {
+  .path = "show vlib graphviz",
+  .short_help = "Dump packet processing node graph as a graphviz dotfile",
+  .function = show_node_graphviz,
+};
+/* *INDENT-ON* */
+
 static u8 *
 format_vlib_node_state (u8 * s, va_list * va)
 {