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ts2phc: instantiate a full clock structure for every PHC master 

This propagates the use of "struct ts2phc_private" all the way into the
master API, in preparation of a new use case that will be supported
soon: some PPS masters (to be precise, the "PHC" kind) instantiate a
struct clock which could be disciplined by ts2phc.

When a PHC A emits a pulse and another PHC B timestamps it, the offset
between their precise timestamps can be used to synchronize either one
of them. So far in ts2phc, only the slave PHC (the one using extts) has
been synchronized to the master (the one using perout).

This is partly because there is no proper kernel API to report the
precise timestamp of a perout pulse. We only have the periodic API, and
that doesn't report precise timestamps either; we just use vague
approximations of what the PPS master PHC's time was, based on reading
that PHC immediately after a slave extts event was received by the
application. While this is far from ideal, it does work, and does allow
PHC A to be synchronized to B.

This is particularly useful with the yet-to-be-introduced "automatic"
mode of ts2phc (similar to '-a' of phc2sys), and the PPS distribution
tree is fixed in hardware (as opposed to port states, which in
"automatic" mode are dynamic, as the name suggests).

Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
master
Vladimir Oltean 2020-07-28 02:52:16 +03:00
parent 1967a5fc26
commit 3f2e73e91b
10 changed files with 39 additions and 30 deletions
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2
ts2phc.c
View File

@ -265,7 +265,7 @@ int main(int argc, char *argv[])
} else {
pps_type = TS2PHC_MASTER_PHC;
}
priv.master = ts2phc_master_create(cfg, pps_source, pps_type);
priv.master = ts2phc_master_create(&priv, pps_source, pps_type);
if (!priv.master) {
fprintf(stderr, "failed to create master\n");
ts2phc_cleanup(&priv);

2
ts2phc_generic_master.c
View File

@ -47,7 +47,7 @@ static int ts2phc_generic_master_getppstime(struct ts2phc_master *m,
return 0;
}
struct ts2phc_master *ts2phc_generic_master_create(struct config *cfg,
struct ts2phc_master *ts2phc_generic_master_create(struct ts2phc_private *priv,
const char *dev)
{
struct ts2phc_generic_master *master;

3
ts2phc_generic_master.h
View File

@ -6,9 +6,10 @@
#ifndef HAVE_TS2PHC_GENERIC_MASTER_H
#define HAVE_TS2PHC_GENERIC_MASTER_H
#include "ts2phc.h"
#include "ts2phc_master.h"
struct ts2phc_master *ts2phc_generic_master_create(struct config *cfg,
struct ts2phc_master *ts2phc_generic_master_create(struct ts2phc_private *priv,
const char *dev);
#endif

10
ts2phc_master.c
View File

@ -3,25 +3,27 @@
* @note Copyright (C) 2019 Richard Cochran <richardcochran@gmail.com>
* @note SPDX-License-Identifier: GPL-2.0+
*/
#include "ts2phc.h"
#include "ts2phc_generic_master.h"
#include "ts2phc_master_private.h"
#include "ts2phc_nmea_master.h"
#include "ts2phc_phc_master.h"
struct ts2phc_master *ts2phc_master_create(struct config *cfg, const char *dev,
struct ts2phc_master *ts2phc_master_create(struct ts2phc_private *priv,
const char *dev,
enum ts2phc_master_type type)
{
struct ts2phc_master *master = NULL;
switch (type) {
case TS2PHC_MASTER_GENERIC:
master = ts2phc_generic_master_create(cfg, dev);
master = ts2phc_generic_master_create(priv, dev);
break;
case TS2PHC_MASTER_NMEA:
master = ts2phc_nmea_master_create(cfg, dev);
master = ts2phc_nmea_master_create(priv, dev);
break;
case TS2PHC_MASTER_PHC:
master = ts2phc_phc_master_create(cfg, dev);
master = ts2phc_phc_master_create(priv, dev);
break;
}
return master;

6
ts2phc_master.h
View File

@ -13,6 +13,7 @@ struct config;
/**
* Opaque type
*/
struct ts2phc_private;
struct ts2phc_master;
/**
@ -26,12 +27,13 @@ enum ts2phc_master_type {
/**
* Create a new instance of a PPS master clock.
* @param cfg Pointer to a valid configuration.
* @param priv Pointer to the program's data structure.
* @param dev Name of the master clock or NULL.
* @param type The type of the clock to create.
* @return A pointer to a new PPS master clock on success, NULL otherwise.
*/
struct ts2phc_master *ts2phc_master_create(struct config *cfg, const char *dev,
struct ts2phc_master *ts2phc_master_create(struct ts2phc_private *priv,
const char *dev,
enum ts2phc_master_type type);
/**

5
ts2phc_nmea_master.c
View File

@ -198,7 +198,8 @@ static int ts2phc_nmea_master_getppstime(struct ts2phc_master *master,
return fix_valid ? lstab_error : -1;
}
struct ts2phc_master *ts2phc_nmea_master_create(struct config *cfg, const char *dev)
struct ts2phc_master *ts2phc_nmea_master_create(struct ts2phc_private *priv,
const char *dev)
{
struct ts2phc_nmea_master *master;
const char *leapfile = NULL; // TODO - read from config.
@ -214,7 +215,7 @@ struct ts2phc_master *ts2phc_nmea_master_create(struct config *cfg, const char *
}
master->master.destroy = ts2phc_nmea_master_destroy;
master->master.getppstime = ts2phc_nmea_master_getppstime;
master->config = cfg;
master->config = priv->cfg;
pthread_mutex_init(&master->mutex, NULL);
err = pthread_create(&master->worker, NULL, monitor_nmea_status, master);
if (err) {

3
ts2phc_nmea_master.h
View File

@ -6,8 +6,9 @@
#ifndef HAVE_TS2PHC_NMEA_MASTER_H
#define HAVE_TS2PHC_NMEA_MASTER_H
#include "ts2phc.h"
#include "ts2phc_master.h"
struct ts2phc_master *ts2phc_nmea_master_create(struct config *cfg,
struct ts2phc_master *ts2phc_nmea_master_create(struct ts2phc_private *priv,
const char *dev);
#endif

33
ts2phc_phc_master.c
View File

@ -12,15 +12,14 @@
#include "phc.h"
#include "print.h"
#include "missing.h"
#include "ts2phc.h"
#include "ts2phc_master_private.h"
#include "ts2phc_phc_master.h"
#include "util.h"
struct ts2phc_phc_master {
struct ts2phc_master master;
clockid_t clkid;
struct clock *clock;
int channel;
int fd;
};
static int ts2phc_phc_master_activate(struct config *cfg, const char *dev,
@ -38,10 +37,10 @@ static int ts2phc_phc_master_activate(struct config *cfg, const char *dev,
desc.func = PTP_PF_PEROUT;
desc.chan = master->channel;
if (phc_pin_setfunc(master->clkid, &desc)) {
if (phc_pin_setfunc(master->clock->clkid, &desc)) {
pr_warning("Failed to set the pin. Continuing bravely on...");
}
if (clock_gettime(master->clkid, &ts)) {
if (clock_gettime(master->clock->clkid, &ts)) {
perror("clock_gettime");
return -1;
}
@ -52,7 +51,8 @@ static int ts2phc_phc_master_activate(struct config *cfg, const char *dev,
perout_request.period.sec = 1;
perout_request.period.nsec = 0;
if (ioctl(master->fd, PTP_PEROUT_REQUEST2, &perout_request)) {
if (ioctl(CLOCKID_TO_FD(master->clock->clkid), PTP_PEROUT_REQUEST2,
&perout_request)) {
pr_err(PTP_PEROUT_REQUEST_FAILED);
return -1;
}
@ -67,10 +67,11 @@ static void ts2phc_phc_master_destroy(struct ts2phc_master *master)
memset(&perout_request, 0, sizeof(perout_request));
perout_request.index = m->channel;
if (ioctl(m->fd, PTP_PEROUT_REQUEST2, &perout_request)) {
if (ioctl(CLOCKID_TO_FD(m->clock->clkid), PTP_PEROUT_REQUEST2,
&perout_request)) {
pr_err(PTP_PEROUT_REQUEST_FAILED);
}
posix_clock_close(m->clkid);
clock_destroy(m->clock);
free(m);
}
@ -79,14 +80,13 @@ static int ts2phc_phc_master_getppstime(struct ts2phc_master *m,
{
struct ts2phc_phc_master *master =
container_of(m, struct ts2phc_phc_master, master);
return clock_gettime(master->clkid, ts);
return clock_gettime(master->clock->clkid, ts);
}
struct ts2phc_master *ts2phc_phc_master_create(struct config *cfg,
struct ts2phc_master *ts2phc_phc_master_create(struct ts2phc_private *priv,
const char *dev)
{
struct ts2phc_phc_master *master;
int junk;
master = calloc(1, sizeof(*master));
if (!master) {
@ -95,16 +95,17 @@ struct ts2phc_master *ts2phc_phc_master_create(struct config *cfg,
master->master.destroy = ts2phc_phc_master_destroy;
master->master.getppstime = ts2phc_phc_master_getppstime;
master->clkid = posix_clock_open(dev, &junk);
if (master->clkid == CLOCK_INVALID) {
master->clock = clock_add(priv, dev);
if (!master->clock) {
free(master);
return NULL;
}
master->fd = CLOCKID_TO_FD(master->clkid);
master->clock->is_destination = 0;
pr_debug("PHC master %s has ptp index %d", dev, junk);
pr_debug("PHC master %s has ptp index %d", dev,
master->clock->phc_index);
if (ts2phc_phc_master_activate(cfg, dev, master)) {
if (ts2phc_phc_master_activate(priv->cfg, dev, master)) {
ts2phc_phc_master_destroy(&master->master);
return NULL;
}

3
ts2phc_phc_master.h
View File

@ -6,9 +6,10 @@
#ifndef HAVE_TS2PHC_PHC_MASTER_H
#define HAVE_TS2PHC_PHC_MASTER_H
#include "ts2phc.h"
#include "ts2phc_master.h"
struct ts2phc_master *ts2phc_phc_master_create(struct config *cfg,
struct ts2phc_master *ts2phc_phc_master_create(struct ts2phc_private *priv,
const char *dev);
#endif

2
ts2phc_slave.c
View File

@ -15,8 +15,8 @@
#include <time.h>
#include <unistd.h>
#include "config.h"
#include "clockadj.h"
#include "config.h"
#include "missing.h"
#include "phc.h"
#include "print.h"