+
+REGISTER_TEST_COMMAND(cycles_autotest, test_cycles);
+
+/*
+ * rte_delay_us_callback test
+ *
+ * - check if callback is correctly registered/unregistered
+ *
+ */
+
+static unsigned int pattern;
+static void my_rte_delay_us(unsigned int us)
+{
+ pattern += us;
+}
+
+static int
+test_user_delay_us(void)
+{
+ pattern = 0;
+
+ rte_delay_us(2);
+ if (pattern != 0)
+ return -1;
+
+ /* register custom delay function */
+ rte_delay_us_callback_register(my_rte_delay_us);
+
+ rte_delay_us(2);
+ if (pattern != 2)
+ return -1;
+
+ rte_delay_us(3);
+ if (pattern != 5)
+ return -1;
+
+ /* restore original delay function */
+ rte_delay_us_callback_register(rte_delay_us_block);
+
+ rte_delay_us(3);
+ if (pattern != 5)
+ return -1;
+
+ return 0;
+}
+
+REGISTER_TEST_COMMAND(user_delay_us, test_user_delay_us);