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, 2 insertions, 13 deletions

diff --git a/src/vpp/vnet/main.c b/src/vpp/vnet/main.c
index a252b846..4a96ca94 100644
--- a/src/vpp/vnet/main.c
+++ b/src/vpp/vnet/main.c
@@ -18,7 +18,7 @@
 #include <vlib/unix/unix.h>
 #include <vnet/plugin/plugin.h>
 #include <vnet/ethernet/ethernet.h>
-
+#include <vpp/app/version.h>
 #include <vpp/api/vpe_msg_enum.h>
 
 
@@ -39,16 +39,7 @@ vpe_main_init (vlib_main_t * vm)
  * Load plugins from /usr/lib/vpp_plugins by default
  */
 char *vlib_plugin_path = "/usr/lib/vpp_plugins";
-
-void *
-vnet_get_handoff_structure (void)
-{
-  static vnet_plugin_handoff_t _rv, *rv = &_rv;
-
-  rv->vnet_main = vnet_get_main ();
-  rv->ethernet_main = &ethernet_main;
-  return (void *) rv;
-}
+char *vlib_plugin_app_version = VPP_BUILD_VER;
 
 int
 main (int argc, char *argv[])
@@ -59,7 +50,6 @@ main (int argc, char *argv[])
   uword main_heap_size = (1ULL << 30);
   u8 *sizep;
   u32 size;
-  void vlib_set_get_handoff_structure_cb (void *cb);
 
 #if __x86_64__
   CLIB_UNUSED (const char *msg)
@@ -206,7 +196,6 @@ defaulted:
 #if DPDK == 0
       unix_physmem_init (vm, 0 /* fail_if_physical_memory_not_present */ );
 #endif
-      vlib_set_get_handoff_structure_cb (&vnet_get_handoff_structure);
       return vlib_unix_main (argc, argv);
     }
   else