5 files changed, 99 insertions, 13 deletions

diff --git a/src/vnet/session/application_worker.c b/src/vnet/session/application_worker.c
index 0cb179161b8..1927f2f78d3 100644
--- a/src/vnet/session/application_worker.c
+++ b/src/vnet/session/application_worker.c
@@ -480,6 +480,7 @@ app_worker_own_session (app_worker_t * app_wrk, session_t * s)
 {
   segment_manager_t *sm;
   svm_fifo_t *rxf, *txf;
+  int rv;
 
   if (s->session_state == SESSION_STATE_LISTENING)
     return application_change_listener_owner (s, app_wrk);
@@ -496,8 +497,8 @@ app_worker_own_session (app_worker_t * app_wrk, session_t * s)
   s->tx_fifo = 0;
 
   sm = app_worker_get_connect_segment_manager (app_wrk);
-  if (app_worker_alloc_session_fifos (sm, s))
-    return -1;
+  if ((rv = app_worker_alloc_session_fifos (sm, s)))
+    return rv;
 
   if (!svm_fifo_is_empty_cons (rxf))
     svm_fifo_clone (s->rx_fifo, rxf);
diff --git a/src/vnet/session/segment_manager.c b/src/vnet/session/segment_manager.c
index c14cffa66a2..ad0ba89a1dd 100644
--- a/src/vnet/session/segment_manager.c
+++ b/src/vnet/session/segment_manager.c
@@ -105,8 +105,8 @@ segment_manager_add_segment_inline (segment_manager_t *sm, uword segment_size,
   /* Not configured for addition of new segments and not first */
   if (!props->add_segment && !segment_size)
     {
-      clib_warning ("cannot allocate new segment");
-      return VNET_API_ERROR_INVALID_VALUE;
+      SESSION_DBG ("cannot allocate new segment");
+      return SESSION_E_INVALID;
     }
 
   /*
@@ -418,7 +418,7 @@ segment_manager_init_first (segment_manager_t * sm)
 	  fs_index = segment_manager_add_segment (sm, max_seg_size, 0);
 	  if (fs_index < 0)
 	    {
-	      clib_warning ("Failed to preallocate segment %d", i);
+	      SESSION_DBG ("Failed to preallocate segment %d", i);
 	      return fs_index;
 	    }
 
@@ -440,7 +440,7 @@ segment_manager_init_first (segment_manager_t * sm)
   fs_index = segment_manager_add_segment (sm, first_seg_size, 0);
   if (fs_index < 0)
     {
-      clib_warning ("Failed to allocate segment");
+      SESSION_DBG ("Failed to allocate segment");
       return fs_index;
     }
 
@@ -458,7 +458,7 @@ segment_manager_init_first (segment_manager_t * sm)
       for (; i < fs->n_slices; i++)
 	{
 	  if (fifo_segment_prealloc_fifo_hdrs (fs, i, hdrs_per_slice))
-	    return VNET_API_ERROR_SVM_SEGMENT_CREATE_FAIL;
+	    return SESSION_E_SEG_CREATE;
 	}
     }
 
@@ -807,7 +807,7 @@ sm_lock_and_alloc_segment_and_fifos (segment_manager_t *sm,
 					props->tx_fifo_size, rx_fifo, tx_fifo);
   if (rv)
     {
-      clib_warning ("Added a segment, still can't allocate a fifo");
+      SESSION_DBG ("Added a segment, still can't allocate a fifo");
       rv = SESSION_E_SEG_NO_SPACE2;
       goto done;
     }
diff --git a/src/vnet/session/session.h b/src/vnet/session/session.h
index 456718afb89..e92b1f079d6 100644
--- a/src/vnet/session/session.h
+++ b/src/vnet/session/session.h
@@ -40,6 +40,11 @@ typedef enum
     SESSION_N_ERROR,
 } session_input_error_t;
 
+typedef struct session_wrk_stats_
+{
+  u32 errors[SESSION_N_ERRORS];
+} session_wrk_stats_t;
+
 typedef struct session_tx_context_
 {
   CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
@@ -169,6 +174,8 @@ typedef struct session_worker_
   u16 batch_num;
   vlib_dma_batch_t *batch;
 
+  session_wrk_stats_t stats;
+
 #if SESSION_DEBUG
   /** last event poll time by thread */
   clib_time_type_t last_event_poll;
@@ -732,6 +739,23 @@ session_main_is_enabled ()
   return session_main.is_enabled == 1;
 }
 
+always_inline void
+session_worker_stat_error_inc (session_worker_t *wrk, int error, int value)
+{
+  if ((-(error) >= 0 && -(error) < SESSION_N_ERRORS))
+    wrk->stats.errors[-error] += value;
+  else
+    SESSION_DBG ("unknown session counter");
+}
+
+always_inline void
+session_stat_error_inc (int error, int value)
+{
+  session_worker_t *wrk;
+  wrk = session_main_get_worker (vlib_get_thread_index ());
+  session_worker_stat_error_inc (wrk, error, value);
+}
+
 #define session_cli_return_if_not_enabled()				\
 do {									\
     if (!session_main.is_enabled)					\
diff --git a/src/vnet/session/session_cli.c b/src/vnet/session/session_cli.c
index 344937c684a..ba2cba02164 100644
--- a/src/vnet/session/session_cli.c
+++ b/src/vnet/session/session_cli.c
@@ -868,6 +868,62 @@ VLIB_CLI_COMMAND (session_enable_disable_command, static) =
 };
 /* *INDENT-ON* */
 
+static clib_error_t *
+show_session_stats_fn (vlib_main_t *vm, unformat_input_t *input,
+		       vlib_cli_command_t *cmd)
+{
+  session_main_t *smm = &session_main;
+  session_worker_t *wrk;
+  unsigned int *e;
+
+  if (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    return clib_error_return (0, "unknown input `%U'", format_unformat_error,
+			      input);
+
+  vec_foreach (wrk, smm->wrk)
+    {
+      vlib_cli_output (vm, "Thread %u:\n", wrk - smm->wrk);
+      e = wrk->stats.errors;
+#define _(name, str)                                                          \
+  if (e[SESSION_EP_##name])                                                   \
+    vlib_cli_output (vm, " %lu %s", e[SESSION_EP_##name], str);
+      foreach_session_error
+#undef _
+    }
+  return 0;
+}
+
+VLIB_CLI_COMMAND (show_session_stats_command, static) = {
+  .path = "show session stats",
+  .short_help = "show session stats",
+  .function = show_session_stats_fn,
+};
+
+static clib_error_t *
+clear_session_stats_fn (vlib_main_t *vm, unformat_input_t *input,
+			vlib_cli_command_t *cmd)
+{
+  session_main_t *smm = &session_main;
+  session_worker_t *wrk;
+
+  if (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    return clib_error_return (0, "unknown input `%U'", format_unformat_error,
+			      input);
+
+  vec_foreach (wrk, smm->wrk)
+    {
+      clib_memset (&wrk->stats, 0, sizeof (wrk->stats));
+    }
+
+  return 0;
+}
+
+VLIB_CLI_COMMAND (clear_session_stats_command, static) = {
+  .path = "clear session stats",
+  .short_help = "clear session stats",
+  .function = clear_session_stats_fn,
+};
+
 /*
  * fd.io coding-style-patch-verification: ON
  *
diff --git a/src/vnet/session/session_node.c b/src/vnet/session/session_node.c
index c61e89bf398..6011704c8d0 100644
--- a/src/vnet/session/session_node.c
+++ b/src/vnet/session/session_node.c
@@ -139,7 +139,7 @@ session_mq_listen_handler (session_worker_t *wrk, session_evt_elt_t *elt)
     a->sep_ext.ext_cfg = session_mq_get_ext_config (app, mp->ext_config);
 
   if ((rv = vnet_listen (a)))
-    clib_warning ("listen returned: %U", format_session_error, rv);
+    session_worker_stat_error_inc (wrk, rv, 1);
 
   app_wrk = application_get_worker (app, mp->wrk_index);
   mq_send_session_bound_cb (app_wrk->wrk_index, mp->context, a->handle, rv);
@@ -178,6 +178,7 @@ session_mq_connect_one (session_connect_msg_t *mp)
 {
   vnet_connect_args_t _a, *a = &_a;
   app_worker_t *app_wrk;
+  session_worker_t *wrk;
   application_t *app;
   int rv;
 
@@ -211,7 +212,8 @@ session_mq_connect_one (session_connect_msg_t *mp)
 
   if ((rv = vnet_connect (a)))
     {
-      clib_warning ("connect returned: %U", format_session_error, rv);
+      wrk = session_main_get_worker (vlib_get_thread_index ());
+      session_worker_stat_error_inc (wrk, rv, 1);
       app_wrk = application_get_worker (app, mp->wrk_index);
       mq_send_session_connected_cb (app_wrk->wrk_index, mp->context, 0, rv);
     }
@@ -320,7 +322,7 @@ session_mq_connect_uri_handler (session_worker_t *wrk, session_evt_elt_t *elt)
   a->app_index = app->app_index;
   if ((rv = vnet_connect_uri (a)))
     {
-      clib_warning ("connect_uri returned: %d", rv);
+      session_worker_stat_error_inc (wrk, rv, 1);
       app_wrk = application_get_worker (app, 0 /* default wrk only */ );
       mq_send_session_connected_cb (app_wrk->wrk_index, mp->context, 0, rv);
     }
@@ -402,7 +404,7 @@ session_mq_unlisten_handler (session_worker_t *wrk, session_evt_elt_t *elt)
   a->wrk_map_index = mp->wrk_index;
 
   if ((rv = vnet_unlisten (a)))
-    clib_warning ("unlisten returned: %d", rv);
+    session_worker_stat_error_inc (wrk, rv, 1);
 
   app_wrk = application_get_worker (app, a->wrk_map_index);
   if (!app_wrk)
@@ -601,6 +603,7 @@ session_mq_worker_update_handler (void *data)
   session_event_t *evt;
   session_t *s;
   application_t *app;
+  int rv;
 
   app = application_lookup (mp->client_index);
   if (!app)
@@ -637,7 +640,9 @@ session_mq_worker_update_handler (void *data)
       return;
     }
 
-  app_worker_own_session (app_wrk, s);
+  rv = app_worker_own_session (app_wrk, s);
+  if (rv)
+    session_stat_error_inc (rv, 1);
 
   /*
    * Send reply