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, 3 insertions, 0 deletions

diff --git a/src/vlib/log.h b/src/vlib/log.h
index 663d7fe86ed..9206ad0fcc6 100644
--- a/src/vlib/log.h
+++ b/src/vlib/log.h
@@ -90,6 +90,9 @@ typedef struct
 extern vlib_log_main_t log_main;
 
 vlib_log_class_t vlib_log_register_class (char *vlass, char *subclass);
+vlib_log_class_t
+vlib_log_register_class_rate_limit (char *class, char *subclass,
+				    u32 rate_limit);
 u32 vlib_log_get_indent ();
 void vlib_log (vlib_log_level_t level, vlib_log_class_t class, char *fmt,
 	       ...);