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, 6 insertions, 8 deletions

diff --git a/src/plugins/ila/ila.c b/src/plugins/ila/ila.c
index 336f4cf560c..e0f3907f5d7 100644
--- a/src/plugins/ila/ila.c
+++ b/src/plugins/ila/ila.c
@@ -18,6 +18,7 @@
 #include <vnet/ip/lookup.h>
 #include <vnet/dpo/dpo.h>
 #include <vnet/fib/fib_table.h>
+#include <vpp/app/version.h>
 
 static ila_main_t ila_main;
 
@@ -821,14 +822,11 @@ ila_interface (u32 sw_if_index, u8 disable)
   return 0;
 }
 
-clib_error_t *
-vlib_plugin_register (vlib_main_t * vm, vnet_plugin_handoff_t * h,
-		      int from_early_init)
-{
-  clib_error_t *error = 0;
-
-  return error;
-}
+/* *INDENT-OFF* */
+VLIB_PLUGIN_REGISTER () = {
+    .version = VPP_BUILD_VER,
+};
+/* *INDENT-ON* */
 
 u8 *format_ila_dpo (u8 * s, va_list * va)
 {