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, 11 insertions, 27 deletions

diff --git a/src/examples/sample-plugin/sample/sample_test.c b/src/examples/sample-plugin/sample/sample_test.c
index 51c2c87cb8d..6f645f7864d 100644
--- a/src/examples/sample-plugin/sample/sample_test.c
+++ b/src/examples/sample-plugin/sample/sample_test.c
@@ -33,19 +33,19 @@ uword unformat_sw_if_index (unformat_input_t * input, va_list * args);
 
 /* define message structures */
 #define vl_typedefs
-#include <sample/sample_all_api_h.h> 
+#include <sample/sample_all_api_h.h>
 #undef vl_typedefs
 
 /* declare message handlers for each api */
 
 #define vl_endianfun             /* define message structures */
-#include <sample/sample_all_api_h.h> 
+#include <sample/sample_all_api_h.h>
 #undef vl_endianfun
 
 /* instantiate all the print functions we know about */
 #define vl_print(handle, ...)
 #define vl_printfun
-#include <sample/sample_all_api_h.h> 
+#include <sample/sample_all_api_h.h>
 #undef vl_printfun
 
 /* Get the API version number. */
@@ -81,7 +81,7 @@ _(sample_macswap_enable_disable_reply)
 foreach_standard_reply_retval_handler;
 #undef _
 
-/* 
+/*
  * Table of message reply handlers, must include boilerplate handlers
  * we just generated
  */
@@ -108,12 +108,12 @@ static int api_sample_macswap_enable_disable (vat_main_t * vam)
         else
             break;
     }
-    
+
     if (sw_if_index == ~0) {
         errmsg ("missing interface name / explicit sw_if_index number \n");
         return -99;
     }
-    
+
     /* Construct the API message */
     M(SAMPLE_MACSWAP_ENABLE_DISABLE, mp);
     mp->sw_if_index = ntohl (sw_if_index);
@@ -127,7 +127,7 @@ static int api_sample_macswap_enable_disable (vat_main_t * vam)
     return ret;
 }
 
-/* 
+/*
  * List of messages that the api test plugin sends,
  * and that the data plane plugin processes
  */
@@ -145,35 +145,19 @@ static void sample_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 * vat_plugin_register (vat_main_t *vam)
-{
-  sample_test_main_t * sm = &sample_test_main;
-  u8 * name;
-
-  sm->vat_main = vam;
-
-  name = format (0, "sample_%08x%c", api_version, 0);
-  sm->msg_id_base = vl_client_get_first_plugin_msg_id ((char *) name);
-
-  if (sm->msg_id_base != (u16) ~0)
-    sample_api_hookup (vam);
-  
-  vec_free(name);
-  
-  return 0;
-}
+VAT_PLUGIN_REGISTER(sample);