ceph/src/dpdk/examples/multi_process/client_server_mp/mp_server/args.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 <stdlib.h>
  36 #include <stdint.h>
  37 #include <getopt.h>
  38 #include <stdarg.h>
  39 #include <errno.h>
  40
  41 #include <rte_memory.h>
  42 #include <rte_string_fns.h>
  43
  44 #include "common.h"
  45 #include "args.h"
  46 #include "init.h"
  47
  48 /* global var for number of clients - extern in header */
  49 uint8_t num_clients;
  50
  51 static const char *progname;
  52
  53 /**
  54  * Prints out usage information to stdout
  55  */
  56 static void
  57 usage(void)
  58 {
  59         printf(
  60             "%s [EAL options] -- -p PORTMASK -n NUM_CLIENTS [-s NUM_SOCKETS]\n"
  61             " -p PORTMASK: hexadecimal bitmask of ports to use\n"
  62             " -n NUM_CLIENTS: number of client processes to use\n"
  63             , progname);
  64 }
  65
  66 /**
  67  * The ports to be used by the application are passed in
  68  * the form of a bitmask. This function parses the bitmask
  69  * and places the port numbers to be used into the port[]
  70  * array variable
  71  */
  72 static int
  73 parse_portmask(uint8_t max_ports, const char *portmask)
  74 {
  75         char *end = NULL;
  76         unsigned long pm;
  77         uint8_t count = 0;
  78
  79         if (portmask == NULL || *portmask == '\0')
  80                 return -1;
  81
  82         /* convert parameter to a number and verify */
  83         pm = strtoul(portmask, &end, 16);
  84         if (end == NULL || *end != '\0' || pm == 0)
  85                 return -1;
  86
  87         /* loop through bits of the mask and mark ports */
  88         while (pm != 0){
  89                 if (pm & 0x01){ /* bit is set in mask, use port */
  90                         if (count >= max_ports)
  91                                 printf("WARNING: requested port %u not present"
  92                                 " - ignoring\n", (unsigned)count);
  93                         else
  94                             ports->id[ports->num_ports++] = count;
  95                 }
  96                 pm = (pm >> 1);
  97                 count++;
  98         }
  99
 100         return 0;
 101 }
 102
 103 /**
 104  * Take the number of clients parameter passed to the app
 105  * and convert to a number to store in the num_clients variable
 106  */
 107 static int
 108 parse_num_clients(const char *clients)
 109 {
 110         char *end = NULL;
 111         unsigned long temp;
 112
 113         if (clients == NULL || *clients == '\0')
 114                 return -1;
 115
 116         temp = strtoul(clients, &end, 10);
 117         if (end == NULL || *end != '\0' || temp == 0)
 118                 return -1;
 119
 120         num_clients = (uint8_t)temp;
 121         return 0;
 122 }
 123
 124 /**
 125  * The application specific arguments follow the DPDK-specific
 126  * arguments which are stripped by the DPDK init. This function
 127  * processes these application arguments, printing usage info
 128  * on error.
 129  */
 130 int
 131 parse_app_args(uint8_t max_ports, int argc, char *argv[])
 132 {
 133         int option_index, opt;
 134         char **argvopt = argv;
 135         static struct option lgopts[] = { /* no long options */
 136                 {NULL, 0, 0, 0 }
 137         };
 138         progname = argv[0];
 139
 140         while ((opt = getopt_long(argc, argvopt, "n:p:", lgopts,
 141                 &option_index)) != EOF){
 142                 switch (opt){
 143                         case 'p':
 144                                 if (parse_portmask(max_ports, optarg) != 0){
 145                                         usage();
 146                                         return -1;
 147                                 }
 148                                 break;
 149                         case 'n':
 150                                 if (parse_num_clients(optarg) != 0){
 151                                         usage();
 152                                         return -1;
 153                                 }
 154                                 break;
 155                         default:
 156                                 printf("ERROR: Unknown option '%c'\n", opt);
 157                                 usage();
 158                                 return -1;
 159                 }
 160         }
 161
 162         if (ports->num_ports == 0 || num_clients == 0){
 163                 usage();
 164                 return -1;
 165         }
 166
 167         if (ports->num_ports % 2 != 0){
 168                 printf("ERROR: application requires an even number of ports to use\n");
 169                 return -1;
 170         }
 171         return 0;
 172 }