examples/multi_process/simple_mp/main.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 /*
   6  * This sample application is a simple multi-process application which
   7  * demostrates sharing of queues and memory pools between processes, and
   8  * using those queues/pools for communication between the processes.
   9  *
  10  * Application is designed to run with two processes, a primary and a
  11  * secondary, and each accepts commands on the commandline, the most
  12  * important of which is "send", which just sends a string to the other
  13  * process.
  14  */
  15
  16 #include <stdio.h>
  17 #include <string.h>
  18 #include <stdint.h>
  19 #include <inttypes.h>
  20 #include <stdarg.h>
  21 #include <errno.h>
  22 #include <unistd.h>
  23 #include <termios.h>
  24 #include <sys/queue.h>
  25
  26 #include <rte_common.h>
  27 #include <rte_memory.h>
  28 #include <rte_launch.h>
  29 #include <rte_eal.h>
  30 #include <rte_per_lcore.h>
  31 #include <rte_lcore.h>
  32 #include <rte_debug.h>
  33 #include <rte_atomic.h>
  34 #include <rte_branch_prediction.h>
  35 #include <rte_ring.h>
  36 #include <rte_log.h>
  37 #include <rte_mempool.h>
  38 #include <cmdline_rdline.h>
  39 #include <cmdline_parse.h>
  40 #include <cmdline_parse_string.h>
  41 #include <cmdline_socket.h>
  42 #include <cmdline.h>
  43 #include "mp_commands.h"
  44
  45 #define RTE_LOGTYPE_APP RTE_LOGTYPE_USER1
  46
  47 static const char *_MSG_POOL = "MSG_POOL";
  48 static const char *_SEC_2_PRI = "SEC_2_PRI";
  49 static const char *_PRI_2_SEC = "PRI_2_SEC";
  50
  51 struct rte_ring *send_ring, *recv_ring;
  52 struct rte_mempool *message_pool;
  53 volatile int quit = 0;
  54
  55 static int
  56 lcore_recv(__rte_unused void *arg)
  57 {
  58         unsigned lcore_id = rte_lcore_id();
  59
  60         printf("Starting core %u\n", lcore_id);
  61         while (!quit){
  62                 void *msg;
  63                 if (rte_ring_dequeue(recv_ring, &msg) < 0){
  64                         usleep(5);
  65                         continue;
  66                 }
  67                 printf("core %u: Received '%s'\n", lcore_id, (char *)msg);
  68                 rte_mempool_put(message_pool, msg);
  69         }
  70
  71         return 0;
  72 }
  73
  74 int
  75 main(int argc, char **argv)
  76 {
  77         const unsigned flags = 0;
  78         const unsigned ring_size = 64;
  79         const unsigned pool_size = 1024;
  80         const unsigned pool_cache = 32;
  81         const unsigned priv_data_sz = 0;
  82
  83         int ret;
  84         unsigned lcore_id;
  85
  86         ret = rte_eal_init(argc, argv);
  87         if (ret < 0)
  88                 rte_exit(EXIT_FAILURE, "Cannot init EAL\n");
  89
  90         if (rte_eal_process_type() == RTE_PROC_PRIMARY){
  91                 send_ring = rte_ring_create(_PRI_2_SEC, ring_size, rte_socket_id(), flags);
  92                 recv_ring = rte_ring_create(_SEC_2_PRI, ring_size, rte_socket_id(), flags);
  93                 message_pool = rte_mempool_create(_MSG_POOL, pool_size,
  94                                 STR_TOKEN_SIZE, pool_cache, priv_data_sz,
  95                                 NULL, NULL, NULL, NULL,
  96                                 rte_socket_id(), flags);
  97         } else {
  98                 recv_ring = rte_ring_lookup(_PRI_2_SEC);
  99                 send_ring = rte_ring_lookup(_SEC_2_PRI);
 100                 message_pool = rte_mempool_lookup(_MSG_POOL);
 101         }
 102         if (send_ring == NULL)
 103                 rte_exit(EXIT_FAILURE, "Problem getting sending ring\n");
 104         if (recv_ring == NULL)
 105                 rte_exit(EXIT_FAILURE, "Problem getting receiving ring\n");
 106         if (message_pool == NULL)
 107                 rte_exit(EXIT_FAILURE, "Problem getting message pool\n");
 108
 109         RTE_LOG(INFO, APP, "Finished Process Init.\n");
 110
 111         /* call lcore_recv() on every slave lcore */
 112         RTE_LCORE_FOREACH_SLAVE(lcore_id) {
 113                 rte_eal_remote_launch(lcore_recv, NULL, lcore_id);
 114         }
 115
 116         /* call cmd prompt on master lcore */
 117         struct cmdline *cl = cmdline_stdin_new(simple_mp_ctx, "\nsimple_mp > ");
 118         if (cl == NULL)
 119                 rte_exit(EXIT_FAILURE, "Cannot create cmdline instance\n");
 120         cmdline_interact(cl);
 121         cmdline_stdin_exit(cl);
 122
 123         rte_eal_mp_wait_lcore();
 124         return 0;
 125 }