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ptp: add the PTP_SYS_OFFSET ioctl to the testptp program

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This patch add a method into testptp.c to measure the time offset
between phc and system clock through the ioctl PTP_SYS_OFFSET.

Signed-off-by: Dong Zhu <bluezhudong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dong Zhu 2013-09-17 15:32:35 +08:00 committed by David S. Miller
parent 7b58446068
commit 568ebc5985
1 changed files with 63 additions and 2 deletions
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65
Documentation/ptp/testptp.c
View file

@ -100,6 +100,11 @@ static long ppb_to_scaled_ppm(int ppb)
return (long) (ppb * 65.536);
}
static int64_t pctns(struct ptp_clock_time *t)
{
return t->sec * 1000000000LL + t->nsec;
}
static void usage(char *progname)
{
fprintf(stderr,
@ -112,6 +117,8 @@ static void usage(char *progname)
" -f val adjust the ptp clock frequency by 'val' ppb\n"
" -g get the ptp clock time\n"
" -h prints this message\n"
" -k val measure the time offset between system and phc clock\n"
" for 'val' times (Maximum 25)\n"
" -p val enable output with a period of 'val' nanoseconds\n"
" -P val enable or disable (val=1|0) the system clock PPS\n"
" -s set the ptp clock time from the system time\n"
@ -133,8 +140,12 @@ int main(int argc, char *argv[])
struct itimerspec timeout;
struct sigevent sigevent;
struct ptp_clock_time *pct;
struct ptp_sys_offset *sysoff;
char *progname;
int c, cnt, fd;
int i, c, cnt, fd;
char *device = DEVICE;
clockid_t clkid;
@ -144,14 +155,19 @@ int main(int argc, char *argv[])
int extts = 0;
int gettime = 0;
int oneshot = 0;
int pct_offset = 0;
int n_samples = 0;
int periodic = 0;
int perout = -1;
int pps = -1;
int settime = 0;
int64_t t1, t2, tp;
int64_t interval, offset;
progname = strrchr(argv[0], '/');
progname = progname ? 1+progname : argv[0];
while (EOF != (c = getopt(argc, argv, "a:A:cd:e:f:ghp:P:sSt:v"))) {
while (EOF != (c = getopt(argc, argv, "a:A:cd:e:f:ghk:p:P:sSt:v"))) {
switch (c) {
case 'a':
oneshot = atoi(optarg);
@ -174,6 +190,10 @@ int main(int argc, char *argv[])
case 'g':
gettime = 1;
break;
case 'k':
pct_offset = 1;
n_samples = atoi(optarg);
break;
case 'p':
perout = atoi(optarg);
break;
@ -376,6 +396,47 @@ int main(int argc, char *argv[])
}
}
if (pct_offset) {
if (n_samples <= 0 || n_samples > 25) {
puts("n_samples should be between 1 and 25");
usage(progname);
return -1;
}
sysoff = calloc(1, sizeof(*sysoff));
if (!sysoff) {
perror("calloc");
return -1;
}
sysoff->n_samples = n_samples;
if (ioctl(fd, PTP_SYS_OFFSET, sysoff))
perror("PTP_SYS_OFFSET");
else
puts("system and phc clock time offset request okay");
pct = &sysoff->ts[0];
for (i = 0; i < sysoff->n_samples; i++) {
t1 = pctns(pct+2*i);
tp = pctns(pct+2*i+1);
t2 = pctns(pct+2*i+2);
interval = t2 - t1;
offset = (t2 + t1) / 2 - tp;
printf("system time: %ld.%ld\n",
(pct+2*i)->sec, (pct+2*i)->nsec);
printf("phc time: %ld.%ld\n",
(pct+2*i+1)->sec, (pct+2*i+1)->nsec);
printf("system time: %ld.%ld\n",
(pct+2*i+2)->sec, (pct+2*i+2)->nsec);
printf("system/phc clock time offset is %ld ns\n"
"system clock time delay is %ld ns\n",
offset, interval);
}
free(sysoff);
}
close(fd);
return 0;
}