Imported Upstream version 16.04

Change-Id: I77eadcd8538a9122e4773cbe55b24033dc451757
Signed-off-by: C.J. Collier <cjcollier@linuxfoundation.org>

1 files changed, 151 insertions, 0 deletions

diff --git a/examples/timer/main.c b/examples/timer/main.c
new file mode 100644
index 00000000..37ad559e
--- /dev/null
+++ b/examples/timer/main.c
@@ -0,0 +1,151 @@
+/*-
+ *   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 <string.h>
+#include <stdint.h>
+#include <errno.h>
+#include <sys/queue.h>
+
+#include <rte_common.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_launch.h>
+#include <rte_eal.h>
+#include <rte_per_lcore.h>
+#include <rte_lcore.h>
+#include <rte_cycles.h>
+#include <rte_timer.h>
+#include <rte_debug.h>
+
+#define TIMER_RESOLUTION_CYCLES 20000000ULL /* around 10ms at 2 Ghz */
+
+static struct rte_timer timer0;
+static struct rte_timer timer1;
+
+/* timer0 callback */
+static void
+timer0_cb(__attribute__((unused)) struct rte_timer *tim,
+	  __attribute__((unused)) void *arg)
+{
+	static unsigned counter = 0;
+	unsigned lcore_id = rte_lcore_id();
+
+	printf("%s() on lcore %u\n", __func__, lcore_id);
+
+	/* this timer is automatically reloaded until we decide to
+	 * stop it, when counter reaches 20. */
+	if ((counter ++) == 20)
+		rte_timer_stop(tim);
+}
+
+/* timer1 callback */
+static void
+timer1_cb(__attribute__((unused)) struct rte_timer *tim,
+	  __attribute__((unused)) void *arg)
+{
+	unsigned lcore_id = rte_lcore_id();
+	uint64_t hz;
+
+	printf("%s() on lcore %u\n", __func__, lcore_id);
+
+	/* reload it on another lcore */
+	hz = rte_get_timer_hz();
+	lcore_id = rte_get_next_lcore(lcore_id, 0, 1);
+	rte_timer_reset(tim, hz/3, SINGLE, lcore_id, timer1_cb, NULL);
+}
+
+static __attribute__((noreturn)) int
+lcore_mainloop(__attribute__((unused)) void *arg)
+{
+	uint64_t prev_tsc = 0, cur_tsc, diff_tsc;
+	unsigned lcore_id;
+
+	lcore_id = rte_lcore_id();
+	printf("Starting mainloop on core %u\n", lcore_id);
+
+	while (1) {
+		/*
+		 * Call the timer handler on each core: as we don't
+		 * need a very precise timer, so only call
+		 * rte_timer_manage() every ~10ms (at 2Ghz). In a real
+		 * application, this will enhance performances as
+		 * reading the HPET timer is not efficient.
+		 */
+		cur_tsc = rte_rdtsc();
+		diff_tsc = cur_tsc - prev_tsc;
+		if (diff_tsc > TIMER_RESOLUTION_CYCLES) {
+			rte_timer_manage();
+			prev_tsc = cur_tsc;
+		}
+	}
+}
+
+int
+main(int argc, char **argv)
+{
+	int ret;
+	uint64_t hz;
+	unsigned lcore_id;
+
+	/* init EAL */
+	ret = rte_eal_init(argc, argv);
+	if (ret < 0)
+		rte_panic("Cannot init EAL\n");
+
+	/* init RTE timer library */
+	rte_timer_subsystem_init();
+
+	/* init timer structures */
+	rte_timer_init(&timer0);
+	rte_timer_init(&timer1);
+
+	/* load timer0, every second, on master lcore, reloaded automatically */
+	hz = rte_get_timer_hz();
+	lcore_id = rte_lcore_id();
+	rte_timer_reset(&timer0, hz, PERIODICAL, lcore_id, timer0_cb, NULL);
+
+	/* load timer1, every second/3, on next lcore, reloaded manually */
+	lcore_id = rte_get_next_lcore(lcore_id, 0, 1);
+	rte_timer_reset(&timer1, hz/3, SINGLE, lcore_id, timer1_cb, NULL);
+
+	/* call lcore_mainloop() on every slave lcore */
+	RTE_LCORE_FOREACH_SLAVE(lcore_id) {
+		rte_eal_remote_launch(lcore_mainloop, NULL, lcore_id);
+	}
+
+	/* call it on master lcore too */
+	(void) lcore_mainloop(NULL);
+
+	return 0;
+}