stats: remove offsets on vpp side

Represent pointers directly in shared memory and require clients to adjust for
shared memory segment being mapped at different base address.
Deprecated: stat_segment_pointer() / stat_segment_offset()
Added: stat_segment_adjust()

Bumped the stat segment version to 2.

Type: refactor
Signed-off-by: Ole Troan <ot@cisco.com>
Change-Id: I33e756187b8903b45dcd353e6c1a101b7a4acb79

3 files changed, 37 insertions, 51 deletions

diff --git a/src/vpp-api/client/stat_client.c b/src/vpp-api/client/stat_client.c
index 54d6db660ee..56ff387d343 100644
--- a/src/vpp-api/client/stat_client.c
+++ b/src/vpp-api/client/stat_client.c
@@ -85,8 +85,8 @@ static stat_segment_directory_entry_t *
 get_stat_vector_r (stat_client_main_t * sm)
 {
   ASSERT (sm->shared_header);
-  return stat_segment_pointer (sm->shared_header,
-			       sm->shared_header->directory_offset);
+  return stat_segment_adjust (sm,
+			      (void *) sm->shared_header->directory_vector);
 }
 
 int
@@ -142,7 +142,7 @@ stat_segment_connect_r (const char *socket_name, stat_client_main_t * sm)
   sm->memory_size = st.st_size;
   sm->shared_header = memaddr;
   sm->directory_vector =
-    stat_segment_pointer (memaddr, sm->shared_header->directory_offset);
+    stat_segment_adjust (sm, (void *) sm->shared_header->directory_vector);
 
   return 0;
 }
@@ -199,7 +199,7 @@ copy_data (stat_segment_directory_entry_t * ep, stat_client_main_t * sm)
   int i;
   vlib_counter_t **combined_c;	/* Combined counter */
   counter_t **simple_c;		/* Simple counter */
-  uint64_t *offset_vector;
+  uint64_t *error_vector;
 
   assert (sm->shared_header);
 
@@ -212,67 +212,47 @@ copy_data (stat_segment_directory_entry_t * ep, stat_client_main_t * sm)
       break;
 
     case STAT_DIR_TYPE_COUNTER_VECTOR_SIMPLE:
-      if (ep->offset == 0)
-	return result;
-      simple_c = stat_segment_pointer (sm->shared_header, ep->offset);
+      simple_c = stat_segment_adjust (sm, ep->data);
       result.simple_counter_vec = vec_dup (simple_c);
-      offset_vector =
-	stat_segment_pointer (sm->shared_header, ep->offset_vector);
       for (i = 0; i < vec_len (simple_c); i++)
 	{
-	  counter_t *cb =
-	    stat_segment_pointer (sm->shared_header, offset_vector[i]);
+	  counter_t *cb = stat_segment_adjust (sm, simple_c[i]);
 	  result.simple_counter_vec[i] = vec_dup (cb);
 	}
       break;
 
     case STAT_DIR_TYPE_COUNTER_VECTOR_COMBINED:
-      if (ep->offset == 0)
-	return result;
-      combined_c = stat_segment_pointer (sm->shared_header, ep->offset);
+      combined_c = stat_segment_adjust (sm, ep->data);
       result.combined_counter_vec = vec_dup (combined_c);
-      offset_vector =
-	stat_segment_pointer (sm->shared_header, ep->offset_vector);
       for (i = 0; i < vec_len (combined_c); i++)
 	{
-	  vlib_counter_t *cb =
-	    stat_segment_pointer (sm->shared_header, offset_vector[i]);
+	  vlib_counter_t *cb = stat_segment_adjust (sm, combined_c[i]);
 	  result.combined_counter_vec[i] = vec_dup (cb);
 	}
       break;
 
     case STAT_DIR_TYPE_ERROR_INDEX:
       /* Gather errors from all threads into a vector */
-      offset_vector = stat_segment_pointer (sm->shared_header,
-					    sm->shared_header->error_offset);
-      vec_validate (result.error_vector, vec_len (offset_vector) - 1);
-      for (i = 0; i < vec_len (offset_vector); i++)
+      error_vector =
+	stat_segment_adjust (sm, (void *) sm->shared_header->error_vector);
+      vec_validate (result.error_vector, vec_len (error_vector) - 1);
+      for (i = 0; i < vec_len (error_vector); i++)
 	{
-	  counter_t *cb =
-	    stat_segment_pointer (sm->shared_header, offset_vector[i]);
+	  counter_t *cb = stat_segment_adjust (sm, (void *) error_vector[i]);
 	  result.error_vector[i] = cb[ep->index];
 	}
       break;
 
     case STAT_DIR_TYPE_NAME_VECTOR:
-      if (ep->offset == 0)
-	return result;
-      uint8_t **name_vector =
-	stat_segment_pointer (sm->shared_header, ep->offset);
-      result.name_vector = vec_dup (name_vector);
-      offset_vector =
-	stat_segment_pointer (sm->shared_header, ep->offset_vector);
-      for (i = 0; i < vec_len (name_vector); i++)
-	{
-	  if (offset_vector[i])
-	    {
-	      u8 *name =
-		stat_segment_pointer (sm->shared_header, offset_vector[i]);
-	      result.name_vector[i] = vec_dup (name);
-	    }
-	  else
-	    result.name_vector[i] = 0;
-	}
+      {
+	uint8_t **name_vector = stat_segment_adjust (sm, ep->data);
+	result.name_vector = vec_dup (name_vector);
+	for (i = 0; i < vec_len (name_vector); i++)
+	  {
+	    u8 *name = stat_segment_adjust (sm, name_vector[i]);
+	    result.name_vector[i] = vec_dup (name);
+	  }
+      }
       break;
 
     case STAT_DIR_TYPE_EMPTY:
diff --git a/src/vpp-api/client/stat_client.h b/src/vpp-api/client/stat_client.h
index 052d9692c88..9385cd242d5 100644
--- a/src/vpp-api/client/stat_client.h
+++ b/src/vpp-api/client/stat_client.h
@@ -101,6 +101,13 @@ _time_now_nsec (void)
   return 1e9 * ts.tv_sec + ts.tv_nsec;
 }
 
+static inline void *
+stat_segment_adjust (stat_client_main_t * sm, void *data)
+{
+  return (void *) ((char *) sm->shared_header +
+		   ((char *) data - (char *) sm->shared_header->base));
+}
+
 static inline int
 stat_segment_access_start (stat_segment_access_t * sa,
 			   stat_client_main_t * sm)
@@ -120,9 +127,10 @@ stat_segment_access_start (stat_segment_access_t * sa,
       while (shared_header->in_progress != 0)
 	;
     }
-  sm->directory_vector = (stat_segment_directory_entry_t *)
-    stat_segment_pointer (sm->shared_header,
-			  sm->shared_header->directory_offset);
+  sm->directory_vector =
+    (stat_segment_directory_entry_t *) stat_segment_adjust (sm,
+							    (void *)
+							    sm->shared_header->directory_vector);
   if (sm->timeout)
     return _time_now_nsec () < max_time ? 0 : -1;
   return 0;
@@ -147,7 +155,6 @@ stat_segment_access_end (stat_segment_access_t * sa, stat_client_main_t * sm)
   return true;
 }
 
-
 #endif /* included_stat_client_h */
 
 /*
diff --git a/src/vpp-api/python/vpp_papi/vpp_stats.py b/src/vpp-api/python/vpp_papi/vpp_stats.py
index aa3409554d0..1a65c8ebad8 100644
--- a/src/vpp-api/python/vpp_papi/vpp_stats.py
+++ b/src/vpp-api/python/vpp_papi/vpp_stats.py
@@ -25,11 +25,10 @@ typedef struct
 {
   stat_directory_type_t type;
   union {
-    uint64_t offset;
     uint64_t index;
     uint64_t value;
+    uint64_t *data;
   };
-  uint64_t offset_vector;
   char name[128]; // TODO change this to pointer to "somewhere"
 } stat_segment_directory_entry_t;
 
@@ -50,11 +49,11 @@ typedef struct
 typedef struct
 {
   uint64_t version;
+  void *base;
   uint64_t epoch;
   uint64_t in_progress;
-  uint64_t directory_offset;
-  uint64_t error_offset;
-  uint64_t stats_offset;
+  stat_segment_directory_entry_t *directory_vector;
+  uint64_t **error_vector;
 } stat_segment_shared_header_t;
 
 typedef struct