STATS: Dynamically mapped shared memory segment

Move from using a hash to a vector with offsets into shared memory.
Limit exposure of VPP data structures and include files to
external stats library and applications.

Change-Id: Ic06129f12d10cf4c4946a86d9bc734eacff2c7da
Signed-off-by: Ole Troan <ot@cisco.com>

5 files changed, 42 insertions, 16 deletions

diff --git a/src/vlib/CMakeLists.txt b/src/vlib/CMakeLists.txt
index c3dfba924a5..b187f980401 100644
--- a/src/vlib/CMakeLists.txt
+++ b/src/vlib/CMakeLists.txt
@@ -66,6 +66,7 @@ add_vpp_library(vlib
   cli_funcs.h
   cli.h
   counter.h
+  counter_types.h
   defs.h
   error_funcs.h
   error.h
diff --git a/src/vlib/counter.c b/src/vlib/counter.c
index 6afa73e0a7d..5c3350fceec 100644
--- a/src/vlib/counter.c
+++ b/src/vlib/counter.c
@@ -99,7 +99,7 @@ vlib_validate_simple_counter (vlib_simple_counter_main_t * cm, u32 index)
     vec_validate_aligned (cm->counters[i], index, CLIB_CACHE_LINE_BYTES);
 
   vlib_stats_pop_heap (cm, oldheap,
-		       3 /* STAT_DIR_TYPE_COUNTER_VECTOR_SIMPLE */ );
+		       2 /* STAT_DIR_TYPE_COUNTER_VECTOR_SIMPLE */ );
 }
 
 void
@@ -114,7 +114,7 @@ vlib_validate_combined_counter (vlib_combined_counter_main_t * cm, u32 index)
     vec_validate_aligned (cm->counters[i], index, CLIB_CACHE_LINE_BYTES);
 
   vlib_stats_pop_heap (cm, oldheap,
-		       4 /*STAT_DIR_TYPE_COUNTER_VECTOR_COMBINED */ );
+		       3 /*STAT_DIR_TYPE_COUNTER_VECTOR_COMBINED */ );
 }
 
 u32
diff --git a/src/vlib/counter.h b/src/vlib/counter.h
index fe5279a5e28..3aacc9b375f 100644
--- a/src/vlib/counter.h
+++ b/src/vlib/counter.h
@@ -40,6 +40,8 @@
 #ifndef included_vlib_counter_h
 #define included_vlib_counter_h
 
+#include <vlib/counter_types.h>
+
 /** \file
 
     Optimized thread-safe counters.
@@ -50,9 +52,6 @@
     The idea is to drastically eliminate atomic operations.
 */
 
-/** 64bit counters */
-typedef u64 counter_t;
-
 /** A collection of simple counters */
 
 typedef struct
@@ -135,14 +134,6 @@ vlib_zero_simple_counter (vlib_simple_counter_main_t * cm, u32 index)
     }
 }
 
-/** Combined counter to hold both packets and byte differences.
- */
-typedef struct
-{
-  counter_t packets;			/**< packet counter */
-  counter_t bytes;			/**< byte counter  */
-} vlib_counter_t;
-
 /** Add two combined counters, results in the first counter
     @param [in,out] a - (vlib_counter_t *) dst counter
     @param b - (vlib_counter_t *) src counter
diff --git a/src/vlib/counter_types.h b/src/vlib/counter_types.h
new file mode 100644
index 00000000000..d6ce27f6fd6
--- /dev/null
+++ b/src/vlib/counter_types.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * 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.
+ */
+
+#ifndef included_vlib_counter_types_h
+#define included_vlib_counter_types_h
+
+#include <stdint.h>
+
+/** 64bit counters */
+typedef uint64_t counter_t;
+
+/** Combined counter to hold both packets and byte differences.
+ */
+typedef struct
+{
+  counter_t packets;			/**< packet counter */
+  counter_t bytes;			/**< byte counter  */
+} vlib_counter_t;
+
+#endif
diff --git a/src/vlib/error.c b/src/vlib/error.c
index aa53324fa8f..9fc1e708b63 100644
--- a/src/vlib/error.c
+++ b/src/vlib/error.c
@@ -140,9 +140,10 @@ VLIB_REGISTER_NODE (misc_drop_buffers_node,static) = {
 };
 /* *INDENT-ON* */
 
-void vlib_stats_register_error_index (u8 *, u64) __attribute__ ((weak));
+void vlib_stats_register_error_index (u8 *, u64 *, u64)
+  __attribute__ ((weak));
 void
-vlib_stats_register_error_index (u8 * notused, u64 notused2)
+vlib_stats_register_error_index (u8 * notused, u64 * notused2, u64 notused3)
 {
 };
 
@@ -210,7 +211,8 @@ vlib_register_errors (vlib_main_t * vm,
       {
 	error_name = format (0, "/err/%v/%s%c", n->name, error_strings[i], 0);
 	/* Note: error_name consumed by the following call */
-	vlib_stats_register_error_index (error_name, n->error_heap_index + i);
+	vlib_stats_register_error_index (error_name, em->counters,
+					 n->error_heap_index + i);
       }
   }