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authorC.J. Collier <cjcollier@linuxfoundation.org>2016-06-14 07:50:17 -0700
committerC.J. Collier <cjcollier@linuxfoundation.org>2016-06-14 12:17:54 -0700
commit97f17497d162afdb82c8704bf097f0fee3724b2e (patch)
tree1c6269614c0c15ffef8451c58ae8f8b30a1bc804 /examples/timer
parente04be89c2409570e0055b2cda60bd11395bb93b0 (diff)
Imported Upstream version 16.04
Change-Id: I77eadcd8538a9122e4773cbe55b24033dc451757 Signed-off-by: C.J. Collier <cjcollier@linuxfoundation.org>
Diffstat (limited to 'examples/timer')
-rw-r--r--examples/timer/Makefile56
-rw-r--r--examples/timer/main.c151
2 files changed, 207 insertions, 0 deletions
diff --git a/examples/timer/Makefile b/examples/timer/Makefile
new file mode 100644
index 00000000..af12b7ba
--- /dev/null
+++ b/examples/timer/Makefile
@@ -0,0 +1,56 @@
+# 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.
+
+ifeq ($(RTE_SDK),)
+$(error "Please define RTE_SDK environment variable")
+endif
+
+# Default target, can be overriden by command line or environment
+RTE_TARGET ?= x86_64-native-linuxapp-gcc
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+# binary name
+APP = timer
+
+# all source are stored in SRCS-y
+SRCS-y := main.c
+
+CFLAGS += -O3
+CFLAGS += $(WERROR_FLAGS)
+
+# workaround for a gcc bug with noreturn attribute
+# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12603
+ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y)
+CFLAGS_main.o += -Wno-return-type
+endif
+
+include $(RTE_SDK)/mk/rte.extapp.mk
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;
+}