bufmon: add buffer monitoring plugin

This plugin allow to keep track of buffer usage in VPP graph nodes. The
main use is to detect buffer leakages.

Type: feature

Change-Id: Iadcf4ab98207fab6e2fa375060879bc2a25b711e
Signed-off-by: Benoît Ganne <bganne@cisco.com>

1 files changed, 27 insertions, 7 deletions

diff --git a/src/vlib/buffer.c b/src/vlib/buffer.c
index adaafa36f5d..71f84d377af 100644
--- a/src/vlib/buffer.c
+++ b/src/vlib/buffer.c
@@ -615,20 +615,26 @@ format_vlib_buffer_pool (u8 * s, va_list * va)
   return s;
 }
 
-static clib_error_t *
-show_buffers (vlib_main_t * vm,
-	      unformat_input_t * input, vlib_cli_command_t * cmd)
+u8 *
+format_vlib_buffer_pool_all (u8 *s, va_list *va)
 {
+  vlib_main_t *vm = va_arg (*va, vlib_main_t *);
   vlib_buffer_main_t *bm = vm->buffer_main;
   vlib_buffer_pool_t *bp;
 
-  vlib_cli_output (vm, "%U", format_vlib_buffer_pool, vm, 0);
+  s = format (s, "%U", format_vlib_buffer_pool, vm, 0);
 
-  /* *INDENT-OFF* */
   vec_foreach (bp, bm->buffer_pools)
-    vlib_cli_output (vm, "%U", format_vlib_buffer_pool, vm, bp);
-  /* *INDENT-ON* */
+    s = format (s, "\n%U", format_vlib_buffer_pool, vm, bp);
+
+  return s;
+}
 
+static clib_error_t *
+show_buffers (vlib_main_t *vm, unformat_input_t *input,
+	      vlib_cli_command_t *cmd)
+{
+  vlib_cli_output (vm, "%U", format_vlib_buffer_pool_all, vm);
   return 0;
 }
 
@@ -971,6 +977,20 @@ vlib_buffer_alloc_may_fail (vlib_main_t * vm, u32 n_buffers)
 }
 #endif
 
+__clib_export int
+vlib_buffer_set_alloc_free_callback (
+  vlib_main_t *vm, vlib_buffer_alloc_free_callback_t *alloc_callback_fn,
+  vlib_buffer_alloc_free_callback_t *free_callback_fn)
+{
+  vlib_buffer_main_t *bm = vm->buffer_main;
+  if ((alloc_callback_fn && bm->alloc_callback_fn) ||
+      (free_callback_fn && bm->free_callback_fn))
+    return 1;
+  bm->alloc_callback_fn = alloc_callback_fn;
+  bm->free_callback_fn = free_callback_fn;
+  return 0;
+}
+
 /** @endcond */
 /*
  * fd.io coding-style-patch-verification: ON