Static: Minor overhaul

The patch fixes several bugs introduced in previous changes, simplifies
the protocol by handing routes uniformly, introduces asynchronous route
processing to avoid issues with separate notifications for each next-hop
in ECMP routes, and makes reconfiguration faster by avoiding quadratic
complexity.

lib/buffer.h

@@ -14,7 +14,7 @@
 #include "sysdep/config.h"
 
 #define BUFFER(type)		struct { type *data; uint used, size; }
-
+#define BUFFER_TYPE(v)		typeof(* (v).data)
 #define BUFFER_SIZE(v)		((v).size * sizeof(* (v).data))
 
 #define BUFFER_INIT(v,pool,isize)					\
@@ -46,6 +46,9 @@
 
 #define BUFFER_FLUSH(v)		({ (v).used = 0; })
 
+#define BUFFER_WALK(v,n)						\
+  for (BUFFER_TYPE(v) *_n = (v).data, n; _n < ((v).data + (v).used) && (n = *_n, 1); _n++)
+
 #define BUFFER_SHALLOW_COPY(dst, src)					\
   ({									\
     (dst).used = (src).used;						\

lib/buffer_test.c

@@ -133,6 +133,25 @@ t_buffer_flush(void)
   return 1;
 }
 
+static int
+t_buffer_walk(void)
+{
+  int i;
+
+  init_buffer();
+  fill_expected_array();
+  for (i = 0; i < MAX_NUM; i++)
+    BUFFER_PUSH(buf) = expected[i];
+
+  i = 0;
+  BUFFER_WALK(buf, v)
+    bt_assert(v == expected[i++]);
+
+  bt_assert(i == MAX_NUM);
+
+  return 1;
+}
+
 int
 main(int argc, char *argv[])
 {
@@ -142,6 +161,7 @@ main(int argc, char *argv[])
   bt_test_suite(t_buffer_pop, "Fill whole buffer (PUSH), a half of elements POP and PUSH new elements");
   bt_test_suite(t_buffer_resize, "Init a small buffer and try overfill");
   bt_test_suite(t_buffer_flush, "Fill and flush all elements");
+  bt_test_suite(t_buffer_walk, "Fill and walk through buffer");
 
   return bt_exit_value();
 }