Imported Upstream version 16.04

[deb_dpdk.git] / app / test / test_cycles.c

diff --git a/app/test/test_cycles.c b/app/test/test_cycles.c
new file mode 100644 (file)
index 0000000..d8fa517
--- /dev/null
+++ b/app/test/test_cycles.c
@@ -0,0 +1,96 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+
+#include <rte_common.h>
+#include <rte_cycles.h>
+
+#include "test.h"
+
+#define N 10000
+
+/*
+ * Cycles test
+ * ===========
+ *
+ * - Loop N times and check that the timer always increments and
+ *   never decrements during this loop.
+ *
+ * - Wait one second using rte_usleep() and check that the increment
+ *   of cycles is correct with regard to the frequency of the timer.
+ */
+
+static int
+test_cycles(void)
+{
+       unsigned i;
+       uint64_t start_cycles, cycles, prev_cycles;
+       uint64_t hz = rte_get_timer_hz();
+       uint64_t max_inc = (hz / 100); /* 10 ms max between 2 reads */
+
+       /* check that the timer is always incrementing */
+       start_cycles = rte_get_timer_cycles();
+       prev_cycles = start_cycles;
+       for (i=0; i<N; i++) {
+               cycles = rte_get_timer_cycles();
+               if ((uint64_t)(cycles - prev_cycles) > max_inc) {
+                       printf("increment too high or going backwards\n");
+                       return -1;
+               }
+               prev_cycles = cycles;
+       }
+
+       /* check that waiting 1 second is precise */
+       prev_cycles = rte_get_timer_cycles();
+       rte_delay_us(1000000);
+       cycles = rte_get_timer_cycles();
+
+       if ((uint64_t)(cycles - prev_cycles) > (hz + max_inc)) {
+               printf("delay_us is not accurate: too long\n");
+               return -1;
+       }
+       if ((uint64_t)(cycles - prev_cycles) < (hz - max_inc)) {
+               printf("delay_us is not accurate: too short\n");
+               return -1;
+       }
+
+       return 0;
+}
+
+static struct test_command cycles_cmd = {
+       .command = "cycles_autotest",
+       .callback = test_cycles,
+};
+REGISTER_TEST_COMMAND(cycles_cmd);