vppinfra: pool_free_elts() now supports fixed-size pools

Test added to the unittest plugin / test_vlib.py

Type: improvement
Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: I73445e57918347c102ff6f5e8c9ddb9bd96f1407
(cherry picked from commit 4de5f9be88857197ddf17e3bff66318f78f4b6bb)

3 files changed, 99 insertions, 29 deletions

diff --git a/src/plugins/unittest/CMakeLists.txt b/src/plugins/unittest/CMakeLists.txt
index 6276a92d749..115ced3393b 100644
--- a/src/plugins/unittest/CMakeLists.txt
+++ b/src/plugins/unittest/CMakeLists.txt
@@ -40,6 +40,7 @@ add_vpp_plugin(unittest
   mfib_test.c
   mpcap_node.c
   policer_test.c
+  pool_test.c
   punt_test.c
   rbtree_test.c
   session_test.c
diff --git a/src/plugins/unittest/pool_test.c b/src/plugins/unittest/pool_test.c
new file mode 100644
index 00000000000..237b6beea09
--- /dev/null
+++ b/src/plugins/unittest/pool_test.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2021 Dave Barach
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vlib/vlib.h>
+
+static clib_error_t *
+test_pool_command_fn (vlib_main_t *vm, unformat_input_t *input,
+		      vlib_cli_command_t *cmd)
+{
+  int i;
+  u64 *pool;
+
+  pool_init_fixed (pool, 2048);
+
+  i = 0;
+
+  while (pool_free_elts (pool) > 0)
+    {
+      u64 *p __attribute__ ((unused));
+
+      pool_get (pool, p);
+      i++;
+    }
+
+  vlib_cli_output (vm, "allocated %d elts\n", i);
+
+  for (--i; i >= 0; i--)
+    {
+      pool_put_index (pool, i);
+    }
+
+  ALWAYS_ASSERT (pool_free_elts (pool) == 2048);
+
+  vlib_cli_output (vm, "Test succeeded...\n");
+  return 0;
+}
+
+VLIB_CLI_COMMAND (test_pool_command, static) = {
+  .path = "test pool",
+  .short_help = "vppinfra pool.h tests",
+  .function = test_pool_command_fn,
+};
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vppinfra/pool.h b/src/vppinfra/pool.h
index 116c1cd1321..4a0414253b4 100644
--- a/src/vppinfra/pool.h
+++ b/src/vppinfra/pool.h
@@ -173,8 +173,12 @@ pool_free_elts (void *v)
     {
       n_free += vec_len (p->free_indices);
 
-      /* Space left at end of vector? */
-      n_free += vec_capacity (v, sizeof (p[0])) - vec_len (v);
+      /*
+       * Space left at end of vector?
+       * Fixed-size pools have max_elts set non-zero,
+       */
+      if (p->max_elts == 0)
+	n_free += vec_capacity (v, sizeof (p[0])) - vec_len (v);
     }
 
   return n_free;
@@ -298,33 +302,36 @@ do {                                                                    \
 #define pool_is_free_index(P,I) pool_is_free((P),(P)+(I))
 
 /** Free an object E in pool P. */
-#define pool_put(P,E)							\
-do {									\
-  typeof (P) _pool_var(p__) = (P);			                \
-  typeof (E) _pool_var(e__) = (E);			                \
-  pool_header_t * _pool_var (p) = pool_header (_pool_var(p__));		\
-  uword _pool_var (l) = _pool_var(e__) - _pool_var(p__);		\
-  ASSERT (vec_is_member (_pool_var(p__), _pool_var(e__)));		\
-  ASSERT (! pool_is_free (_pool_var(p__), _pool_var(e__)));		\
-									\
-  /* Add element to free bitmap and to free list. */			\
-  _pool_var (p)->free_bitmap =						\
-    clib_bitmap_ori_notrim (_pool_var (p)->free_bitmap,              	\
-                             _pool_var (l));	                        \
-                                                                        \
-  /* Preallocated pool? */                                              \
-  if (_pool_var (p)->max_elts)                                          \
-    {                                                                   \
-      ASSERT(_pool_var(l) < _pool_var (p)->max_elts);                   \
-      _pool_var(p)->free_indices[_vec_len(_pool_var(p)->free_indices)] = \
-                                 _pool_var(l);                          \
-      _vec_len(_pool_var(p)->free_indices) += 1;                        \
-    }                                                                   \
-  else                                                                  \
-    vec_add1 (_pool_var (p)->free_indices, _pool_var (l));		\
-                                                                        \
-  CLIB_MEM_POISON(_pool_var(e__), sizeof(_pool_var(e__)[0]));                                 \
-} while (0)
+#define pool_put(P, E)                                                        \
+  do                                                                          \
+    {                                                                         \
+      typeof (P) _pool_var (p__) = (P);                                       \
+      typeof (E) _pool_var (e__) = (E);                                       \
+      pool_header_t *_pool_var (p) = pool_header (_pool_var (p__));           \
+      uword _pool_var (l) = _pool_var (e__) - _pool_var (p__);                \
+      if (_pool_var (p)->max_elts == 0)                                       \
+	ASSERT (vec_is_member (_pool_var (p__), _pool_var (e__)));            \
+      ASSERT (!pool_is_free (_pool_var (p__), _pool_var (e__)));              \
+                                                                              \
+      /* Add element to free bitmap and to free list. */                      \
+      _pool_var (p)->free_bitmap =                                            \
+	clib_bitmap_ori_notrim (_pool_var (p)->free_bitmap, _pool_var (l));   \
+                                                                              \
+      /* Preallocated pool? */                                                \
+      if (_pool_var (p)->max_elts)                                            \
+	{                                                                     \
+	  ASSERT (_pool_var (l) < _pool_var (p)->max_elts);                   \
+	  _pool_var (p)                                                       \
+	    ->free_indices[_vec_len (_pool_var (p)->free_indices)] =          \
+	    _pool_var (l);                                                    \
+	  _vec_len (_pool_var (p)->free_indices) += 1;                        \
+	}                                                                     \
+      else                                                                    \
+	vec_add1 (_pool_var (p)->free_indices, _pool_var (l));                \
+                                                                              \
+      CLIB_MEM_POISON (_pool_var (e__), sizeof (_pool_var (e__)[0]));         \
+    }                                                                         \
+  while (0)
 
 /** Free pool element with given index. */
 #define pool_put_index(p,i)			\