Documentation/networking/timestamping/hwtstamp_config.c

   1 /* Test program for SIOC{G,S}HWTSTAMP
   2  * Copyright 2013 Solarflare Communications
   3  * Author: Ben Hutchings
   4  */
   5
   6 #include <errno.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10
  11 #include <sys/socket.h>
  12 #include <sys/ioctl.h>
  13
  14 #include <linux/if.h>
  15 #include <linux/net_tstamp.h>
  16 #include <linux/sockios.h>
  17
  18 static int
  19 lookup_value(const char **names, int size, const char *name)
  20 {
  21         int value;
  22
  23         for (value = 0; value < size; value++)
  24                 if (names[value] && strcasecmp(names[value], name) == 0)
  25                         return value;
  26
  27         return -1;
  28 }
  29
  30 static const char *
  31 lookup_name(const char **names, int size, int value)
  32 {
  33         return (value >= 0 && value < size) ? names[value] : NULL;
  34 }
  35
  36 static void list_names(FILE *f, const char **names, int size)
  37 {
  38         int value;
  39
  40         for (value = 0; value < size; value++)
  41                 if (names[value])
  42                         fprintf(f, "    %s\n", names[value]);
  43 }
  44
  45 static const char *tx_types[] = {
  46 #define TX_TYPE(name) [HWTSTAMP_TX_ ## name] = #name
  47         TX_TYPE(OFF),
  48         TX_TYPE(ON),
  49         TX_TYPE(ONESTEP_SYNC)
  50 #undef TX_TYPE
  51 };
  52 #define N_TX_TYPES ((int)(sizeof(tx_types) / sizeof(tx_types[0])))
  53
  54 static const char *rx_filters[] = {
  55 #define RX_FILTER(name) [HWTSTAMP_FILTER_ ## name] = #name
  56         RX_FILTER(NONE),
  57         RX_FILTER(ALL),
  58         RX_FILTER(SOME),
  59         RX_FILTER(PTP_V1_L4_EVENT),
  60         RX_FILTER(PTP_V1_L4_SYNC),
  61         RX_FILTER(PTP_V1_L4_DELAY_REQ),
  62         RX_FILTER(PTP_V2_L4_EVENT),
  63         RX_FILTER(PTP_V2_L4_SYNC),
  64         RX_FILTER(PTP_V2_L4_DELAY_REQ),
  65         RX_FILTER(PTP_V2_L2_EVENT),
  66         RX_FILTER(PTP_V2_L2_SYNC),
  67         RX_FILTER(PTP_V2_L2_DELAY_REQ),
  68         RX_FILTER(PTP_V2_EVENT),
  69         RX_FILTER(PTP_V2_SYNC),
  70         RX_FILTER(PTP_V2_DELAY_REQ),
  71 #undef RX_FILTER
  72 };
  73 #define N_RX_FILTERS ((int)(sizeof(rx_filters) / sizeof(rx_filters[0])))
  74
  75 static void usage(void)
  76 {
  77         fputs("Usage: hwtstamp_config if_name [tx_type rx_filter]\n"
  78               "tx_type is any of (case-insensitive):\n",
  79               stderr);
  80         list_names(stderr, tx_types, N_TX_TYPES);
  81         fputs("rx_filter is any of (case-insensitive):\n", stderr);
  82         list_names(stderr, rx_filters, N_RX_FILTERS);
  83 }
  84
  85 int main(int argc, char **argv)
  86 {
  87         struct ifreq ifr;
  88         struct hwtstamp_config config;
  89         const char *name;
  90         int sock;
  91
  92         if ((argc != 2 && argc != 4) || (strlen(argv[1]) >= IFNAMSIZ)) {
  93                 usage();
  94                 return 2;
  95         }
  96
  97         if (argc == 4) {
  98                 config.flags = 0;
  99                 config.tx_type = lookup_value(tx_types, N_TX_TYPES, argv[2]);
 100                 config.rx_filter = lookup_value(rx_filters, N_RX_FILTERS, argv[3]);
 101                 if (config.tx_type < 0 || config.rx_filter < 0) {
 102                         usage();
 103                         return 2;
 104                 }
 105         }
 106
 107         sock = socket(AF_INET, SOCK_DGRAM, 0);
 108         if (sock < 0) {
 109                 perror("socket");
 110                 return 1;
 111         }
 112
 113         strcpy(ifr.ifr_name, argv[1]);
 114         ifr.ifr_data = (caddr_t)&config;
 115
 116         if (ioctl(sock, (argc == 2) ? SIOCGHWTSTAMP : SIOCSHWTSTAMP, &ifr)) {
 117                 perror("ioctl");
 118                 return 1;
 119         }
 120
 121         printf("flags = %#x\n", config.flags);
 122         name = lookup_name(tx_types, N_TX_TYPES, config.tx_type);
 123         if (name)
 124                 printf("tx_type = %s\n", name);
 125         else
 126                 printf("tx_type = %d\n", config.tx_type);
 127         name = lookup_name(rx_filters, N_RX_FILTERS, config.rx_filter);
 128         if (name)
 129                 printf("rx_filter = %s\n", name);
 130         else
 131                 printf("rx_filter = %d\n", config.rx_filter);
 132
 133         return 0;
 134 }