dpdk: cli to check for buffer leakage

Use buffer pre_data and existing buffer trace trajectory code to
find out dpdk buffer leakages.

Change-Id: I26a5d8bd2f23d01cb6070ffc3ddcc6d3d863b575
Signed-off-by: Florin Coras <fcoras@cisco.com>

1 files changed, 62 insertions, 1 deletions

diff --git a/src/plugins/dpdk/buffer.c b/src/plugins/dpdk/buffer.c
index 28af100af32..e09d80194ed 100644
--- a/src/plugins/dpdk/buffer.c
+++ b/src/plugins/dpdk/buffer.c
@@ -340,7 +340,7 @@ vlib_buffer_free_inline (vlib_main_t * vm,
       vlib_buffer_t *b;
 
       b = vlib_get_buffer (vm, buffers[i]);
-
+      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
       fl = vlib_buffer_get_buffer_free_list (vm, b, &fi);
 
       /* The only current use of this callback: multicast recycle */
@@ -493,6 +493,67 @@ buffer_state_validation_init (vlib_main_t * vm)
 VLIB_INIT_FUNCTION (buffer_state_validation_init);
 #endif
 
+#if CLI_DEBUG
+struct dpdk_validate_buf_result
+{
+  u32 invalid;
+  u32 uninitialized;
+};
+
+#define DPDK_TRAJECTORY_POISON 31
+
+static void
+dpdk_buffer_validate_trajectory (struct rte_mempool *mp, void *opaque,
+				 void *obj, unsigned obj_idx)
+{
+  vlib_buffer_t *b;
+  struct dpdk_validate_buf_result *counter = opaque;
+  b = vlib_buffer_from_rte_mbuf ((struct rte_mbuf *) obj);
+  if (b->pre_data[0] != 0)
+    {
+      if (b->pre_data[0] == DPDK_TRAJECTORY_POISON)
+	counter->uninitialized++;
+      else
+	counter->invalid++;
+    }
+}
+
+int
+dpdk_buffer_validate_trajectory_all (u32 * uninitialized)
+{
+  dpdk_main_t *dm = &dpdk_main;
+  struct dpdk_validate_buf_result counter = { 0 };
+  int i;
+
+  for (i = 0; i < vec_len (dm->pktmbuf_pools); i++)
+    rte_mempool_obj_iter (dm->pktmbuf_pools[i],
+			  dpdk_buffer_validate_trajectory, &counter);
+  if (uninitialized)
+    *uninitialized = counter.uninitialized;
+  return counter.invalid;
+}
+
+static void
+dpdk_buffer_poison_trajectory (struct rte_mempool *mp, void *opaque,
+			       void *obj, unsigned obj_idx)
+{
+  vlib_buffer_t *b;
+  b = vlib_buffer_from_rte_mbuf ((struct rte_mbuf *) obj);
+  b->pre_data[0] = DPDK_TRAJECTORY_POISON;
+}
+
+void
+dpdk_buffer_poison_trajectory_all (void)
+{
+  dpdk_main_t *dm = &dpdk_main;
+  int i;
+
+  for (i = 0; i < vec_len (dm->pktmbuf_pools); i++)
+    rte_mempool_obj_iter (dm->pktmbuf_pools[i], dpdk_buffer_poison_trajectory,
+			  0);
+}
+#endif
+
 /* *INDENT-OFF* */
 VLIB_BUFFER_REGISTER_CALLBACKS (dpdk, static) = {
   .vlib_buffer_alloc_cb = &dpdk_buffer_alloc,