ceph/src/dpdk/app/test/test_rwlock.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <stdio.h>
  35 #include <stdint.h>
  36 #include <unistd.h>
  37 #include <sys/queue.h>
  38
  39 #include <rte_common.h>
  40 #include <rte_memory.h>
  41 #include <rte_memzone.h>
  42 #include <rte_per_lcore.h>
  43 #include <rte_launch.h>
  44 #include <rte_atomic.h>
  45 #include <rte_rwlock.h>
  46 #include <rte_eal.h>
  47 #include <rte_per_lcore.h>
  48 #include <rte_lcore.h>
  49 #include <rte_cycles.h>
  50
  51 #include "test.h"
  52
  53 /*
  54  * rwlock test
  55  * ===========
  56  *
  57  * - There is a global rwlock and a table of rwlocks (one per lcore).
  58  *
  59  * - The test function takes all of these locks and launches the
  60  *   ``test_rwlock_per_core()`` function on each core (except the master).
  61  *
  62  *   - The function takes the global write lock, display something,
  63  *     then releases the global lock.
  64  *   - Then, it takes the per-lcore write lock, display something, and
  65  *     releases the per-core lock.
  66  *   - Finally, a read lock is taken during 100 ms, then released.
  67  *
  68  * - The main function unlocks the per-lcore locks sequentially and
  69  *   waits between each lock. This triggers the display of a message
  70  *   for each core, in the correct order.
  71  *
  72  *   Then, it tries to take the global write lock and display the last
  73  *   message. The autotest script checks that the message order is correct.
  74  */
  75
  76 static rte_rwlock_t sl;
  77 static rte_rwlock_t sl_tab[RTE_MAX_LCORE];
  78
  79 static int
  80 test_rwlock_per_core(__attribute__((unused)) void *arg)
  81 {
  82         rte_rwlock_write_lock(&sl);
  83         printf("Global write lock taken on core %u\n", rte_lcore_id());
  84         rte_rwlock_write_unlock(&sl);
  85
  86         rte_rwlock_write_lock(&sl_tab[rte_lcore_id()]);
  87         printf("Hello from core %u !\n", rte_lcore_id());
  88         rte_rwlock_write_unlock(&sl_tab[rte_lcore_id()]);
  89
  90         rte_rwlock_read_lock(&sl);
  91         printf("Global read lock taken on core %u\n", rte_lcore_id());
  92         rte_delay_ms(100);
  93         printf("Release global read lock on core %u\n", rte_lcore_id());
  94         rte_rwlock_read_unlock(&sl);
  95
  96         return 0;
  97 }
  98
  99 static int
 100 test_rwlock(void)
 101 {
 102         int i;
 103
 104         rte_rwlock_init(&sl);
 105         for (i=0; i<RTE_MAX_LCORE; i++)
 106                 rte_rwlock_init(&sl_tab[i]);
 107
 108         rte_rwlock_write_lock(&sl);
 109
 110         RTE_LCORE_FOREACH_SLAVE(i) {
 111                 rte_rwlock_write_lock(&sl_tab[i]);
 112                 rte_eal_remote_launch(test_rwlock_per_core, NULL, i);
 113         }
 114
 115         rte_rwlock_write_unlock(&sl);
 116
 117         RTE_LCORE_FOREACH_SLAVE(i) {
 118                 rte_rwlock_write_unlock(&sl_tab[i]);
 119                 rte_delay_ms(100);
 120         }
 121
 122         rte_rwlock_write_lock(&sl);
 123         /* this message should be the last message of test */
 124         printf("Global write lock taken on master core %u\n", rte_lcore_id());
 125         rte_rwlock_write_unlock(&sl);
 126
 127         rte_eal_mp_wait_lcore();
 128
 129         return 0;
 130 }
 131
 132 REGISTER_TEST_COMMAND(rwlock_autotest, test_rwlock);