vlib: add plugin override support

Allow a plugin to override (suppress loading of) other plugins. This
mechanism allows a developer to prevent specific plugins from being
loaded.

To do so, provide an "overrides" list in the plugin definition:

VLIB_PLUGIN_REGISTER () =
{
  <snip>
  .overrides = "avf_plugin.so,ioam_plugin.so,dpdk_plugin.so",
};

or some such. Simply list the plugins in question as shown above. The
.overrides structure member is limited to 256 octets. The named .elf
section mechanism used to discover the vlib_plugin_registration_t's
precludes the use of a variable-length array of strings.

Use the vlib log to eliminate plugin and built-in vat plugin loader
console spew.

Added vlib_log_register_class_rate_limit(...) to allow procedural
configuration of the log rate-limit. We *never* want to rate-limit
plugin loader messages.

Type: feature

Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: I0a9327b8cf5508482f057342783252112cb44170

1 files changed, 2 insertions, 0 deletions

diff --git a/src/vlib/unix/main.c b/src/vlib/unix/main.c
index 7f1a8f35126..e40a462578e 100755
--- a/src/vlib/unix/main.c
+++ b/src/vlib/unix/main.c
@@ -685,6 +685,8 @@ vlib_unix_main (int argc, char *argv[])
     (((uword) vm->heap_base) & ~(VLIB_FRAME_ALIGN - 1));
   ASSERT (vm->heap_base);
 
+  clib_time_init (&vm->clib_time);
+
   unformat_init_command_line (&input, (char **) vm->argv);
   if ((e = vlib_plugin_config (vm, &input)))
     {