Plugin infrastructure improvements

This patch replaces requirement for vlib_plugin_register function
in the plugin so file and introduces new macro:

VLIB_PLUGIN_REGISTER () = {
  .version = "version string",
  .version_required = "requred version",
  .default_disabled = 1,
  .early_init = "early_init_function_name",
};

Plugin will nor be loaded if .default_disabled is set to 1
unless explicitely enabled in startup.conf.

If .verstion_required is set, plugin will not be loaded if there
is version mismatch between plugin and vpp. This can be bypassed
by setting "skip-version-check" for specific plugin.

If .early-init string is present, plugin loader will try to resolve
this specific symbol in the plugin namespace and make a function call.

Following startup.conf configuration is added:

plugins {
  path /path/to/plugin/directory
  plugin ila_plugin.so { enable skip-version-check }
  plugin acl_plugin.so { disable }
}

Change-Id: I706c691dd34d94ffe9e02b59831af8859a95f061
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/vlib/unix/main.c b/src/vlib/unix/main.c
index 562778e0e5d..a04d9f9c6ab 100644
--- a/src/vlib/unix/main.c
+++ b/src/vlib/unix/main.c
@@ -503,6 +503,14 @@ vlib_unix_main (int argc, char *argv[])
   vm->heap_base = clib_mem_get_heap ();
   ASSERT (vm->heap_base);
 
+  unformat_init_command_line (&input, (char **) vm->argv);
+  if ((e = vlib_plugin_config (vm, &input)))
+    {
+      clib_error_report (e);
+      return 1;
+    }
+  unformat_free (&input);
+
   i = vlib_plugin_early_init (vm);
   if (i)
     return i;