vat: unload unused vat plugins

If the corresponding vpp plugin is absent, return a non-zero
clib_error_t * from vat_plugin_register ("xxx plugin not loaded"). The
vat plugin calls dlclose on the vat plugin, and it disappears.

Depending on the plugin configuration, this can reduce the vpp virtual
size by several gigabytes.

Added a VAT_PLUGIN(<plugin-name>) macro to vat_helper_macros, clean up
boilerplate vat_plugin_register() implementations. Fixed a number of
non-standard vat_plugin_register methods.

Type: refactor

Change-Id: Iac908e5af7d5497c78d6aa9c3c51cdae08374045
Signed-off-by: Dave Barach <dave@barachs.net>

1 files changed, 19 insertions, 17 deletions

diff --git a/src/plugins/ioam/lib-pot/pot_test.c b/src/plugins/ioam/lib-pot/pot_test.c
index e02640b44dc..d0cf49eea37 100644
--- a/src/plugins/ioam/lib-pot/pot_test.c
+++ b/src/plugins/ioam/lib-pot/pot_test.c
@@ -111,7 +111,7 @@ foreach_standard_reply_retval_handler;
 foreach_custom_reply_retval_handler;
 #undef _
 
-/* 
+/*
  * Table of message reply handlers, must include boilerplate handlers
  * we just generated
  */
@@ -167,7 +167,7 @@ static int api_pot_profile_add (vat_main_t *vam)
         rv = -99;
         goto OUT;
       }
-    
+
     M2(POT_PROFILE_ADD, mp, vec_len(name));
 
     mp->list_name_len = vec_len(name);
@@ -187,11 +187,11 @@ static int api_pot_profile_add (vat_main_t *vam)
       }
     mp->id = id;
     mp->max_bits = bits;
-      
+
     S(mp);
     W (ret);
     return ret;
-  
+
 OUT:
     vec_free(name);
     return(rv);
@@ -206,7 +206,7 @@ static int api_pot_profile_activate (vat_main_t *vam)
     u8 id = 0;
     int rv = 0;
     int ret;
-    
+
     while (unformat_check_input(input) != UNFORMAT_END_OF_INPUT)
       {
         if (unformat(input, "name %s", &name))
@@ -223,17 +223,17 @@ static int api_pot_profile_activate (vat_main_t *vam)
         rv = -99;
         goto OUT;
       }
-    
+
     M2(POT_PROFILE_ACTIVATE, mp, vec_len(name));
 
     mp->list_name_len = vec_len(name);
     clib_memcpy(mp->list_name, name, mp->list_name_len);
     mp->id = id;
-      
+
     S(mp);
     W (ret);
     return ret;
-  
+
 OUT:
     vec_free(name);
     return(rv);
@@ -244,7 +244,7 @@ static int api_pot_profile_del (vat_main_t *vam)
 {
     vl_api_pot_profile_del_t *mp;
     int ret;
-   
+
     M(POT_PROFILE_DEL, mp);
     mp->list_name_len = 0;
     S(mp);
@@ -274,7 +274,7 @@ static int api_pot_profile_show_config_dump (vat_main_t *vam)
     return ret;
 }
 
-/* 
+/*
  * List of messages that the api test plugin sends,
  * and that the data plane plugin processes
  */
@@ -287,7 +287,7 @@ _(pot_profile_activate, "name <name> id [0-1] ")    			\
 _(pot_profile_del, "[id <nn>]")                                         \
 _(pot_profile_show_config_dump, "id [0-1]")
 
-static void 
+static void
 pot_vat_api_hookup (vat_main_t *vam)
 {
     pot_test_main_t * sm = &pot_test_main;
@@ -299,21 +299,22 @@ pot_vat_api_hookup (vat_main_t *vam)
                            vl_noop_handler,                     \
                            vl_api_##n##_t_endian,               \
                            vl_api_##n##_t_print,                \
-                           sizeof(vl_api_##n##_t), 1); 
+                           sizeof(vl_api_##n##_t), 1);
     foreach_vpe_api_reply_msg;
 #undef _
 
     /* API messages we can send */
 #define _(n,h) hash_set_mem (vam->function_by_name, #n, api_##n);
     foreach_vpe_api_msg;
-#undef _    
-    
+#undef _
+
     /* Help strings */
 #define _(n,h) hash_set_mem (vam->help_by_name, #n, h);
     foreach_vpe_api_msg;
 #undef _
 }
 
+
 clib_error_t *
 pot_vat_plugin_register (vat_main_t *vam)
 {
@@ -324,11 +325,12 @@ pot_vat_plugin_register (vat_main_t *vam)
 
   name = format (0, "ioam_pot_%08x%c", api_version, 0);
   sm->msg_id_base = vl_client_get_first_plugin_msg_id ((char *) name);
+  vec_free(name);
 
   if (sm->msg_id_base != (u16) ~0)
     pot_vat_api_hookup (vam);
-  
-  vec_free(name);
-  
+  else
+    return clib_error_return (0, "ioam_pot plugin not loaded...");
+
   return 0;
 }