X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=test%2Ftest%2Ftest_spinlock.c;fp=test%2Ftest%2Ftest_spinlock.c;h=2d94eecc21a99a299423002043d36b43886df864;hb=7595afa4d30097c1177b69257118d8ad89a539be;hp=0000000000000000000000000000000000000000;hpb=ce3d555e43e3795b5d9507fcfc76b7a0a92fd0d6;p=deb_dpdk.git

diff --git a/test/test/test_spinlock.c b/test/test/test_spinlock.c
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+/*-
+ *   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 <inttypes.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/queue.h>
+
+#include <rte_common.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_per_lcore.h>
+#include <rte_launch.h>
+#include <rte_eal.h>
+#include <rte_per_lcore.h>
+#include <rte_lcore.h>
+#include <rte_cycles.h>
+#include <rte_spinlock.h>
+#include <rte_atomic.h>
+
+#include "test.h"
+
+/*
+ * Spinlock test
+ * =============
+ *
+ * - There is a global spinlock and a table of spinlocks (one per lcore).
+ *
+ * - The test function takes all of these locks and launches the
+ *   ``test_spinlock_per_core()`` function on each core (except the master).
+ *
+ *   - The function takes the global lock, display something, then releases
+ *     the global lock.
+ *   - The function takes the per-lcore lock, display something, then releases
+ *     the per-core lock.
+ *
+ * - The main function unlocks the per-lcore locks sequentially and
+ *   waits between each lock. This triggers the display of a message
+ *   for each core, in the correct order. The autotest script checks that
+ *   this order is correct.
+ *
+ * - A load test is carried out, with all cores attempting to lock a single lock
+ *   multiple times
+ */
+
+static rte_spinlock_t sl, sl_try;
+static rte_spinlock_t sl_tab[RTE_MAX_LCORE];
+static rte_spinlock_recursive_t slr;
+static unsigned count = 0;
+
+static rte_atomic32_t synchro;
+
+static int
+test_spinlock_per_core(__attribute__((unused)) void *arg)
+{
+	rte_spinlock_lock(&sl);
+	printf("Global lock taken on core %u\n", rte_lcore_id());
+	rte_spinlock_unlock(&sl);
+
+	rte_spinlock_lock(&sl_tab[rte_lcore_id()]);
+	printf("Hello from core %u !\n", rte_lcore_id());
+	rte_spinlock_unlock(&sl_tab[rte_lcore_id()]);
+
+	return 0;
+}
+
+static int
+test_spinlock_recursive_per_core(__attribute__((unused)) void *arg)
+{
+	unsigned id = rte_lcore_id();
+
+	rte_spinlock_recursive_lock(&slr);
+	printf("Global recursive lock taken on core %u - count = %d\n",
+	       id, slr.count);
+	rte_spinlock_recursive_lock(&slr);
+	printf("Global recursive lock taken on core %u - count = %d\n",
+	       id, slr.count);
+	rte_spinlock_recursive_lock(&slr);
+	printf("Global recursive lock taken on core %u - count = %d\n",
+	       id, slr.count);
+
+	printf("Hello from within recursive locks from core %u !\n", id);
+
+	rte_spinlock_recursive_unlock(&slr);
+	printf("Global recursive lock released on core %u - count = %d\n",
+	       id, slr.count);
+	rte_spinlock_recursive_unlock(&slr);
+	printf("Global recursive lock released on core %u - count = %d\n",
+	       id, slr.count);
+	rte_spinlock_recursive_unlock(&slr);
+	printf("Global recursive lock released on core %u - count = %d\n",
+	       id, slr.count);
+
+	return 0;
+}
+
+static rte_spinlock_t lk = RTE_SPINLOCK_INITIALIZER;
+static uint64_t lock_count[RTE_MAX_LCORE] = {0};
+
+#define TIME_MS 100
+
+static int
+load_loop_fn(void *func_param)
+{
+	uint64_t time_diff = 0, begin;
+	uint64_t hz = rte_get_timer_hz();
+	uint64_t lcount = 0;
+	const int use_lock = *(int*)func_param;
+	const unsigned lcore = rte_lcore_id();
+
+	/* wait synchro for slaves */
+	if (lcore != rte_get_master_lcore())
+		while (rte_atomic32_read(&synchro) == 0);
+
+	begin = rte_get_timer_cycles();
+	while (time_diff < hz * TIME_MS / 1000) {
+		if (use_lock)
+			rte_spinlock_lock(&lk);
+		lcount++;
+		if (use_lock)
+			rte_spinlock_unlock(&lk);
+		/* delay to make lock duty cycle slighlty realistic */
+		rte_delay_us(1);
+		time_diff = rte_get_timer_cycles() - begin;
+	}
+	lock_count[lcore] = lcount;
+	return 0;
+}
+
+static int
+test_spinlock_perf(void)
+{
+	unsigned int i;
+	uint64_t total = 0;
+	int lock = 0;
+	const unsigned lcore = rte_lcore_id();
+
+	printf("\nTest with no lock on single core...\n");
+	load_loop_fn(&lock);
+	printf("Core [%u] count = %"PRIu64"\n", lcore, lock_count[lcore]);
+	memset(lock_count, 0, sizeof(lock_count));
+
+	printf("\nTest with lock on single core...\n");
+	lock = 1;
+	load_loop_fn(&lock);
+	printf("Core [%u] count = %"PRIu64"\n", lcore, lock_count[lcore]);
+	memset(lock_count, 0, sizeof(lock_count));
+
+	printf("\nTest with lock on %u cores...\n", rte_lcore_count());
+
+	/* Clear synchro and start slaves */
+	rte_atomic32_set(&synchro, 0);
+	rte_eal_mp_remote_launch(load_loop_fn, &lock, SKIP_MASTER);
+
+	/* start synchro and launch test on master */
+	rte_atomic32_set(&synchro, 1);
+	load_loop_fn(&lock);
+
+	rte_eal_mp_wait_lcore();
+
+	RTE_LCORE_FOREACH(i) {
+		printf("Core [%u] count = %"PRIu64"\n", i, lock_count[i]);
+		total += lock_count[i];
+	}
+
+	printf("Total count = %"PRIu64"\n", total);
+
+	return 0;
+}
+
+/*
+ * Use rte_spinlock_trylock() to trylock a spinlock object,
+ * If it could not lock the object sucessfully, it would
+ * return immediately and the variable of "count" would be
+ * increased by one per times. the value of "count" could be
+ * checked as the result later.
+ */
+static int
+test_spinlock_try(__attribute__((unused)) void *arg)
+{
+	if (rte_spinlock_trylock(&sl_try) == 0) {
+		rte_spinlock_lock(&sl);
+		count ++;
+		rte_spinlock_unlock(&sl);
+	}
+
+	return 0;
+}
+
+
+/*
+ * Test rte_eal_get_lcore_state() in addition to spinlocks
+ * as we have "waiting" then "running" lcores.
+ */
+static int
+test_spinlock(void)
+{
+	int ret = 0;
+	int i;
+
+	/* slave cores should be waiting: print it */
+	RTE_LCORE_FOREACH_SLAVE(i) {
+		printf("lcore %d state: %d\n", i,
+		       (int) rte_eal_get_lcore_state(i));
+	}
+
+	rte_spinlock_init(&sl);
+	rte_spinlock_init(&sl_try);
+	rte_spinlock_recursive_init(&slr);
+	for (i=0; i<RTE_MAX_LCORE; i++)
+		rte_spinlock_init(&sl_tab[i]);
+
+	rte_spinlock_lock(&sl);
+
+	RTE_LCORE_FOREACH_SLAVE(i) {
+		rte_spinlock_lock(&sl_tab[i]);
+		rte_eal_remote_launch(test_spinlock_per_core, NULL, i);
+	}
+
+	/* slave cores should be busy: print it */
+	RTE_LCORE_FOREACH_SLAVE(i) {
+		printf("lcore %d state: %d\n", i,
+		       (int) rte_eal_get_lcore_state(i));
+	}
+	rte_spinlock_unlock(&sl);
+
+	RTE_LCORE_FOREACH_SLAVE(i) {
+		rte_spinlock_unlock(&sl_tab[i]);
+		rte_delay_ms(10);
+	}
+
+	rte_eal_mp_wait_lcore();
+
+	rte_spinlock_recursive_lock(&slr);
+
+	/*
+	 * Try to acquire a lock that we already own
+	 */
+	if(!rte_spinlock_recursive_trylock(&slr)) {
+		printf("rte_spinlock_recursive_trylock failed on a lock that "
+		       "we already own\n");
+		ret = -1;
+	} else
+		rte_spinlock_recursive_unlock(&slr);
+
+	RTE_LCORE_FOREACH_SLAVE(i) {
+		rte_eal_remote_launch(test_spinlock_recursive_per_core, NULL, i);
+	}
+	rte_spinlock_recursive_unlock(&slr);
+	rte_eal_mp_wait_lcore();
+
+	/*
+	 * Test if it could return immediately from try-locking a locked object.
+	 * Here it will lock the spinlock object first, then launch all the slave
+	 * lcores to trylock the same spinlock object.
+	 * All the slave lcores should give up try-locking a locked object and
+	 * return immediately, and then increase the "count" initialized with zero
+	 * by one per times.
+	 * We can check if the "count" is finally equal to the number of all slave
+	 * lcores to see if the behavior of try-locking a locked spinlock object
+	 * is correct.
+	 */
+	if (rte_spinlock_trylock(&sl_try) == 0) {
+		return -1;
+	}
+	count = 0;
+	RTE_LCORE_FOREACH_SLAVE(i) {
+		rte_eal_remote_launch(test_spinlock_try, NULL, i);
+	}
+	rte_eal_mp_wait_lcore();
+	rte_spinlock_unlock(&sl_try);
+	if (rte_spinlock_is_locked(&sl)) {
+		printf("spinlock is locked but it should not be\n");
+		return -1;
+	}
+	rte_spinlock_lock(&sl);
+	if (count != ( rte_lcore_count() - 1)) {
+		ret = -1;
+	}
+	rte_spinlock_unlock(&sl);
+
+	/*
+	 * Test if it can trylock recursively.
+	 * Use rte_spinlock_recursive_trylock() to check if it can lock a spinlock
+	 * object recursively. Here it will try to lock a spinlock object twice.
+	 */
+	if (rte_spinlock_recursive_trylock(&slr) == 0) {
+		printf("It failed to do the first spinlock_recursive_trylock but it should able to do\n");
+		return -1;
+	}
+	if (rte_spinlock_recursive_trylock(&slr) == 0) {
+		printf("It failed to do the second spinlock_recursive_trylock but it should able to do\n");
+		return -1;
+	}
+	rte_spinlock_recursive_unlock(&slr);
+	rte_spinlock_recursive_unlock(&slr);
+
+	if (test_spinlock_perf() < 0)
+		return -1;
+
+	return ret;
+}
+
+REGISTER_TEST_COMMAND(spinlock_autotest, test_spinlock);