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clock.c
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clock.c
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/**
* @file clock.c
* @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <errno.h>
#include <poll.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "address.h"
#include "bmc.h"
#include "clock.h"
#include "clockadj.h"
#include "clockcheck.h"
#include "foreign.h"
#include "filter.h"
#include "missing.h"
#include "msg.h"
#include "phc.h"
#include "port.h"
#include "servo.h"
#include "stats.h"
#include "print.h"
#include "tlv.h"
#include "uds.h"
#include "util.h"
#define CLK_N_PORTS (MAX_PORTS + 1) /* plus one for the UDS interface */
#define N_CLOCK_PFD (N_POLLFD + 1) /* one extra per port, for the fault timer */
#define POW2_41 ((double)(1ULL << 41))
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
struct freq_estimator {
tmv_t origin1;
tmv_t ingress1;
unsigned int max_count;
unsigned int count;
};
struct clock_stats {
struct stats *offset;
struct stats *freq;
struct stats *delay;
unsigned int max_count;
};
struct clock_subscriber {
LIST_ENTRY(clock_subscriber) list;
uint8_t events[EVENT_BITMASK_CNT];
struct PortIdentity targetPortIdentity;
struct address addr;
UInteger16 sequenceId;
time_t expiration;
};
struct clock {
clockid_t clkid;
struct servo *servo;
struct defaultDS dds;
struct dataset default_dataset;
struct currentDS cur;
struct parent_ds dad;
struct timePropertiesDS tds;
struct ClockIdentity ptl[PATH_TRACE_MAX];
struct foreign_clock *best;
struct ClockIdentity best_id;
struct port *port[CLK_N_PORTS];
struct pollfd pollfd[CLK_N_PORTS*N_CLOCK_PFD];
int fault_fd[CLK_N_PORTS];
int nports; /* does not include the UDS port */
int free_running;
int freq_est_interval;
int grand_master_capable; /* for 802.1AS only */
int utc_timescale;
int leap_set;
int kernel_leap;
int utc_offset; /* grand master role */
int time_flags; /* grand master role */
int time_source; /* grand master role */
enum servo_state servo_state;
tmv_t master_offset;
tmv_t path_delay;
struct filter *delay_filter;
struct freq_estimator fest;
struct time_status_np status;
struct follow_up_info_tlv clksrc_fup_info;
double nrr;
tmv_t c1;
tmv_t c2;
tmv_t t1;
tmv_t t2;
struct clock_description desc;
struct clock_stats stats;
int stats_interval;
struct clockcheck *sanity_check;
struct interface uds_interface;
LIST_HEAD(clock_subscribers_head, clock_subscriber) subscribers;
port_update_cb_t port_update_cb;
void *port_update_cb_priv;
clock_update_cb_t clock_update_cb;
void *clock_update_cb_priv;
};
struct clock the_clock;
int clock_register_clock_update_cb(struct clock *c, clock_update_cb_t cb, void *priv)
{
c->clock_update_cb = cb;
c->clock_update_cb_priv = priv;
/* if the callback is being registered, call it once for each data type */
if (c->clock_update_cb) {
struct parentDS *pds = &clock_parent_ds(c)->pds;
clock_call_clock_update_cb(c, PARENT_DATA_SET, 0, pds, sizeof(pds));
}
return 0;
}
int clock_call_clock_update_cb(struct clock *c, int data_id, int ev_id, void *buf, size_t buf_len)
{
if (!c->clock_update_cb)
return 0;
c->clock_update_cb(data_id, ev_id, buf, buf_len, c->clock_update_cb_priv);
return 0;
}
int clock_register_port_update_cb(struct clock *c, port_update_cb_t cb, void *priv)
{
c->port_update_cb = cb;
c->port_update_cb_priv = priv;
/* if the callback is being registered, call it for each port with current info */
if (c->port_update_cb) {
int i;
struct port_capable_info info;
for (i=0; i<CLK_N_PORTS; i++) {
if (!c->port[i])
continue;
port_capable_info(c->port[i], &info);
clock_call_port_update_cb(c, &info);
}
}
return 0;
}
int clock_call_port_update_cb(struct clock *c, struct port_capable_info *info)
{
if (!c->port_update_cb)
return 0;
c->port_update_cb(info, c->port_update_cb_priv);
return 0;
}
static void handle_state_decision_event(struct clock *c);
static int cid_eq(struct ClockIdentity *a, struct ClockIdentity *b)
{
return 0 == memcmp(a, b, sizeof(*a));
}
#ifndef LIST_FOREACH_SAFE
#define LIST_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = LIST_FIRST((head)); \
(var) && ((tvar) = LIST_NEXT((var), field), 1); \
(var) = (tvar))
#endif
static void remove_subscriber(struct clock_subscriber *s)
{
LIST_REMOVE(s, list);
free(s);
}
static void clock_update_subscription(struct clock *c, struct ptp_message *req,
uint8_t *bitmask, uint16_t duration)
{
struct clock_subscriber *s;
int i, remove = 1;
struct timespec now;
for (i = 0; i < EVENT_BITMASK_CNT; i++) {
if (bitmask[i]) {
remove = 0;
break;
}
}
LIST_FOREACH(s, &c->subscribers, list) {
if (!memcmp(&s->targetPortIdentity, &req->header.sourcePortIdentity,
sizeof(struct PortIdentity))) {
/* Found, update the transport address and event
* mask. */
if (!remove) {
s->addr = req->address;
memcpy(s->events, bitmask, EVENT_BITMASK_CNT);
clock_gettime(CLOCK_MONOTONIC, &now);
s->expiration = now.tv_sec + duration;
} else {
remove_subscriber(s);
}
return;
}
}
if (remove)
return;
/* Not present yet, add the subscriber. */
s = malloc(sizeof(*s));
if (!s) {
pr_err("failed to allocate memory for a subscriber");
return;
}
s->targetPortIdentity = req->header.sourcePortIdentity;
s->addr = req->address;
memcpy(s->events, bitmask, EVENT_BITMASK_CNT);
clock_gettime(CLOCK_MONOTONIC, &now);
s->expiration = now.tv_sec + duration;
s->sequenceId = 0;
LIST_INSERT_HEAD(&c->subscribers, s, list);
}
static void clock_get_subscription(struct clock *c, struct ptp_message *req,
uint8_t *bitmask, uint16_t *duration)
{
struct clock_subscriber *s;
struct timespec now;
LIST_FOREACH(s, &c->subscribers, list) {
if (!memcmp(&s->targetPortIdentity, &req->header.sourcePortIdentity,
sizeof(struct PortIdentity))) {
memcpy(bitmask, s->events, EVENT_BITMASK_CNT);
clock_gettime(CLOCK_MONOTONIC, &now);
if (s->expiration < now.tv_sec)
*duration = 0;
else
*duration = s->expiration - now.tv_sec;
return;
}
}
/* A client without entry means the client has no subscriptions. */
memset(bitmask, 0, EVENT_BITMASK_CNT);
*duration = 0;
}
static void clock_flush_subscriptions(struct clock *c)
{
struct clock_subscriber *s, *tmp;
LIST_FOREACH_SAFE(s, &c->subscribers, list, tmp) {
remove_subscriber(s);
}
}
static void clock_prune_subscriptions(struct clock *c)
{
struct clock_subscriber *s, *tmp;
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
LIST_FOREACH_SAFE(s, &c->subscribers, list, tmp) {
if (s->expiration <= now.tv_sec) {
pr_info("subscriber %s timed out",
pid2str(&s->targetPortIdentity));
remove_subscriber(s);
}
}
}
void clock_send_notification(struct clock *c, struct ptp_message *msg,
int msglen, enum notification event)
{
unsigned int event_pos = event / 8;
uint8_t mask = 1 << (event % 8);
struct port *uds = c->port[c->nports];
struct clock_subscriber *s;
LIST_FOREACH(s, &c->subscribers, list) {
if (!(s->events[event_pos] & mask))
continue;
/* send event */
msg->header.sequenceId = htons(s->sequenceId);
s->sequenceId++;
msg->management.targetPortIdentity.clockIdentity =
s->targetPortIdentity.clockIdentity;
msg->management.targetPortIdentity.portNumber =
htons(s->targetPortIdentity.portNumber);
msg->address = s->addr;
port_forward_to(uds, msg);
}
}
void clock_destroy(struct clock *c)
{
int i;
clock_flush_subscriptions(c);
for (i = 0; i < c->nports; i++) {
port_close(c->port[i]);
close(c->fault_fd[i]);
}
port_close(c->port[i]); /*uds*/
if (c->clkid != CLOCK_REALTIME) {
phc_close(c->clkid);
}
servo_destroy(c->servo);
filter_destroy(c->delay_filter);
stats_destroy(c->stats.offset);
stats_destroy(c->stats.freq);
stats_destroy(c->stats.delay);
if (c->sanity_check)
clockcheck_destroy(c->sanity_check);
memset(c, 0, sizeof(*c));
msg_cleanup();
}
static int clock_fault_timeout(struct clock *c, int index, int set)
{
struct fault_interval i;
if (!set) {
pr_debug("clearing fault on port %d", index + 1);
return set_tmo_lin(c->fault_fd[index], 0);
}
fault_interval(c->port[index], last_fault_type(c->port[index]), &i);
if (i.type == FTMO_LINEAR_SECONDS) {
pr_debug("waiting %d seconds to clear fault on port %d",
i.val, index + 1);
return set_tmo_lin(c->fault_fd[index], i.val);
} else if (i.type == FTMO_LOG2_SECONDS) {
pr_debug("waiting 2^{%d} seconds to clear fault on port %d",
i.val, index + 1);
return set_tmo_log(c->fault_fd[index], 1, i.val);
}
pr_err("Unsupported fault interval type %d", i.type);
return -1;
}
static void clock_freq_est_reset(struct clock *c)
{
c->fest.origin1 = tmv_zero();
c->fest.ingress1 = tmv_zero();
c->fest.count = 0;
};
static void clock_management_send_error(struct port *p,
struct ptp_message *msg, int error_id)
{
if (port_management_error(port_identity(p), p, msg, error_id))
pr_err("failed to send management error status");
}
/* The 'p' and 'req' paremeters are needed for the GET actions that operate
* on per-client datasets. If such actions do not apply to the caller, it is
* allowed to pass both of them as NULL.
*/
static int clock_management_fill_response(struct clock *c, struct port *p,
struct ptp_message *req,
struct ptp_message *rsp, int id)
{
int datalen = 0, respond = 0;
struct management_tlv *tlv;
struct management_tlv_datum *mtd;
struct time_status_np *tsn;
struct grandmaster_settings_np *gsn;
struct subscribe_events_np *sen;
struct PTPText *text;
tlv = (struct management_tlv *) rsp->management.suffix;
tlv->type = TLV_MANAGEMENT;
tlv->id = id;
switch (id) {
case USER_DESCRIPTION:
text = (struct PTPText *) tlv->data;
text->length = c->desc.userDescription.length;
memcpy(text->text, c->desc.userDescription.text, text->length);
datalen = 1 + text->length;
respond = 1;
break;
case DEFAULT_DATA_SET:
memcpy(tlv->data, &c->dds, sizeof(c->dds));
datalen = sizeof(c->dds);
respond = 1;
break;
case CURRENT_DATA_SET:
memcpy(tlv->data, &c->cur, sizeof(c->cur));
datalen = sizeof(c->cur);
respond = 1;
break;
case PARENT_DATA_SET:
memcpy(tlv->data, &c->dad.pds, sizeof(c->dad.pds));
datalen = sizeof(c->dad.pds);
respond = 1;
break;
case TIME_PROPERTIES_DATA_SET:
memcpy(tlv->data, &c->tds, sizeof(c->tds));
datalen = sizeof(c->tds);
respond = 1;
break;
case PRIORITY1:
mtd = (struct management_tlv_datum *) tlv->data;
mtd->val = c->dds.priority1;
datalen = sizeof(*mtd);
respond = 1;
break;
case PRIORITY2:
mtd = (struct management_tlv_datum *) tlv->data;
mtd->val = c->dds.priority2;
datalen = sizeof(*mtd);
respond = 1;
break;
case DOMAIN:
mtd = (struct management_tlv_datum *) tlv->data;
mtd->val = c->dds.domainNumber;
datalen = sizeof(*mtd);
respond = 1;
break;
case SLAVE_ONLY:
mtd = (struct management_tlv_datum *) tlv->data;
mtd->val = c->dds.flags & DDS_SLAVE_ONLY;
datalen = sizeof(*mtd);
respond = 1;
break;
case CLOCK_ACCURACY:
mtd = (struct management_tlv_datum *) tlv->data;
mtd->val = c->dds.clockQuality.clockAccuracy;
datalen = sizeof(*mtd);
respond = 1;
break;
case TRACEABILITY_PROPERTIES:
mtd = (struct management_tlv_datum *) tlv->data;
mtd->val = c->tds.flags & (TIME_TRACEABLE|FREQ_TRACEABLE);
datalen = sizeof(*mtd);
respond = 1;
break;
case TIMESCALE_PROPERTIES:
mtd = (struct management_tlv_datum *) tlv->data;
mtd->val = c->tds.flags & PTP_TIMESCALE;
datalen = sizeof(*mtd);
respond = 1;
break;
case PATH_TRACE_LIST:
datalen = c->dad.path_length * sizeof(struct ClockIdentity);
memcpy(tlv->data, c->dad.ptl, datalen);
respond = 1;
break;
case TIME_STATUS_NP:
tsn = (struct time_status_np *) tlv->data;
/* Are we the grandmaster? */
if (cid_eq(&c->dad.pds.grandmasterIdentity, &c->dds.clockIdentity)) {
tsn->master_offset = 0;
tsn->ingress_time = 0;
tsn->cumulativeScaledRateOffset = 0;
tsn->gmTimeBaseIndicator = c->clksrc_fup_info.gmTimeBaseIndicator;
tsn->lastGmPhaseChange = c->clksrc_fup_info.lastGmPhaseChange;
tsn->scaledLastGmFreqChange = c->clksrc_fup_info.scaledLastGmFreqChange;
tsn->gmPresent = 0;
} else {
tsn->master_offset = c->master_offset;
tsn->ingress_time = tmv_to_nanoseconds(c->t2);
tsn->cumulativeScaledRateOffset =
(Integer32) (c->status.cumulativeScaledRateOffset +
c->nrr * POW2_41 - POW2_41);
tsn->scaledLastGmFreqChange = c->status.scaledLastGmFreqChange;
tsn->gmTimeBaseIndicator = c->status.gmTimeBaseIndicator;
tsn->lastGmPhaseChange = c->status.lastGmPhaseChange;
tsn->gmPresent = 1;
}
tsn->gmIdentity = c->dad.pds.grandmasterIdentity;
datalen = sizeof(*tsn);
respond = 1;
break;
case GRANDMASTER_SETTINGS_NP:
gsn = (struct grandmaster_settings_np *) tlv->data;
gsn->clockQuality = c->dds.clockQuality;
gsn->utc_offset = c->utc_offset;
gsn->time_flags = c->time_flags;
gsn->time_source = c->time_source;
datalen = sizeof(*gsn);
respond = 1;
break;
case SUBSCRIBE_EVENTS_NP:
if (p != c->port[c->nports]) {
/* Only the UDS port allowed. */
break;
}
sen = (struct subscribe_events_np *)tlv->data;
clock_get_subscription(c, req, sen->bitmask, &sen->duration);
respond = 1;
break;
}
if (respond) {
if (datalen % 2) {
tlv->data[datalen] = 0;
datalen++;
}
tlv->length = sizeof(tlv->id) + datalen;
rsp->header.messageLength += sizeof(*tlv) + datalen;
rsp->tlv_count = 1;
}
return respond;
}
static int clock_management_get_response(struct clock *c, struct port *p,
int id, struct ptp_message *req)
{
struct PortIdentity pid = port_identity(p);
struct ptp_message *rsp;
int respond;
rsp = port_management_reply(pid, p, req);
if (!rsp) {
return 0;
}
respond = clock_management_fill_response(c, p, req, rsp, id);
if (respond)
port_prepare_and_send(p, rsp, 0);
msg_put(rsp);
return respond;
}
static int clock_management_set(struct clock *c, struct port *p,
int id, struct ptp_message *req, int *changed)
{
int respond = 0;
struct management_tlv *tlv;
struct management_tlv_datum *mtd;
struct grandmaster_settings_np *gsn;
struct subscribe_events_np *sen;
tlv = (struct management_tlv *) req->management.suffix;
switch (id) {
case GRANDMASTER_SETTINGS_NP:
gsn = (struct grandmaster_settings_np *) tlv->data;
c->dds.clockQuality = gsn->clockQuality;
c->utc_offset = gsn->utc_offset;
c->time_flags = gsn->time_flags;
c->time_source = gsn->time_source;
*changed = 1;
respond = 1;
break;
case SUBSCRIBE_EVENTS_NP:
sen = (struct subscribe_events_np *)tlv->data;
clock_update_subscription(c, req, sen->bitmask,
sen->duration);
respond = 1;
break;
case PRIORITY1:
mtd = (struct management_tlv_datum *) tlv->data;
c->dds.priority1 = mtd->val;
*changed = 1;
respond = 1;
break;
}
if (respond && !clock_management_get_response(c, p, id, req))
pr_err("failed to send management set response");
return respond ? 1 : 0;
}
static void clock_stats_update(struct clock_stats *s,
int64_t offset, double freq)
{
struct stats_result offset_stats, freq_stats, delay_stats;
stats_add_value(s->offset, offset);
stats_add_value(s->freq, freq);
if (stats_get_num_values(s->offset) < s->max_count)
return;
stats_get_result(s->offset, &offset_stats);
stats_get_result(s->freq, &freq_stats);
/* Path delay stats are updated separately, they may be empty. */
if (!stats_get_result(s->delay, &delay_stats)) {
pr_info("rms %4.0f max %4.0f "
"freq %+6.0f +/- %3.0f "
"delay %5.0f +/- %3.0f",
offset_stats.rms, offset_stats.max_abs,
freq_stats.mean, freq_stats.stddev,
delay_stats.mean, delay_stats.stddev);
} else {
pr_info("rms %4.0f max %4.0f "
"freq %+6.0f +/- %3.0f",
offset_stats.rms, offset_stats.max_abs,
freq_stats.mean, freq_stats.stddev);
}
stats_reset(s->offset);
stats_reset(s->freq);
stats_reset(s->delay);
}
static enum servo_state clock_no_adjust(struct clock *c)
{
double fui;
double ratio, freq;
tmv_t origin2;
struct freq_estimator *f = &c->fest;
enum servo_state state = SERVO_UNLOCKED;
/*
* We have clock.t1 as the origin time stamp, and clock.t2 as
* the ingress. According to the master's clock, the time at
* which the sync arrived is:
*
* origin = origin_ts + path_delay + correction
*
* The ratio of the local clock freqency to the master clock
* is estimated by:
*
* (ingress_2 - ingress_1) / (origin_2 - origin_1)
*
* Both of the origin time estimates include the path delay,
* but we assume that the path delay is in fact constant.
* By leaving out the path delay altogther, we can avoid the
* error caused by our imperfect path delay measurement.
*/
if (!f->ingress1) {
f->ingress1 = c->t2;
f->origin1 = tmv_add(c->t1, tmv_add(c->c1, c->c2));
return state;
}
f->count++;
if (f->count < f->max_count) {
return state;
}
if (tmv_eq(c->t2, f->ingress1)) {
pr_warning("bad timestamps in rate ratio calculation");
return state;
}
/*
* origin2 = c->t1 (+c->path_delay) + c->c1 + c->c2;
*/
origin2 = tmv_add(c->t1, tmv_add(c->c1, c->c2));
ratio = tmv_dbl(tmv_sub(origin2, f->origin1)) /
tmv_dbl(tmv_sub(c->t2, f->ingress1));
freq = (1.0 - ratio) * 1e9;
c->clksrc_fup_info.scaledLastGmFreqChange =
(Integer32)((1.0/ratio - 1.0) * POW2_41);
if (c->stats.max_count > 1) {
clock_stats_update(&c->stats,
tmv_to_nanoseconds(c->master_offset), freq);
} else {
pr_info("master offset %10" PRId64 " s%d freq %+7.0f "
"path delay %9" PRId64,
tmv_to_nanoseconds(c->master_offset), state, freq,
tmv_to_nanoseconds(c->path_delay));
}
fui = 1.0 + (c->status.cumulativeScaledRateOffset + 0.0) / POW2_41;
pr_debug("peer/local %.9f", c->nrr);
pr_debug("fup_info %.9f", fui);
pr_debug("product %.9f", fui * c->nrr);
pr_debug("sum-1 %.9f", fui + c->nrr - 1.0);
pr_debug("master/local %.9f", ratio);
pr_debug("diff %+.9f", ratio - (fui + c->nrr - 1.0));
f->ingress1 = c->t2;
f->origin1 = origin2;
f->count = 0;
return state;
}
static void clock_update_grandmaster(struct clock *c)
{
struct parentDS *pds = &c->dad.pds;
memset(&c->cur, 0, sizeof(c->cur));
memset(c->ptl, 0, sizeof(c->ptl));
if (!cid_eq(&pds->grandmasterIdentity, &c->dds.clockIdentity))
c->clksrc_fup_info.gmTimeBaseIndicator++;
pds->parentPortIdentity.clockIdentity = c->dds.clockIdentity;
pds->parentPortIdentity.portNumber = 0;
pds->grandmasterIdentity = c->dds.clockIdentity;
pds->grandmasterClockQuality = c->dds.clockQuality;
pds->grandmasterPriority1 = c->dds.priority1;
pds->grandmasterPriority2 = c->dds.priority2;
c->dad.path_length = 0;
c->tds.currentUtcOffset = c->utc_offset;
c->tds.flags = c->time_flags;
c->tds.timeSource = c->time_source;
clock_call_clock_update_cb(c, PARENT_DATA_SET, 1 /* MIB ID for ParentClockIdentity */, pds, sizeof(*pds));
}
static void clock_update_slave(struct clock *c)
{
struct parentDS *pds = &c->dad.pds;
struct ptp_message *msg = TAILQ_FIRST(&c->best->messages);
c->cur.stepsRemoved = 1 + c->best->dataset.stepsRemoved;
pds->parentPortIdentity = c->best->dataset.sender;
pds->grandmasterIdentity = msg->announce.grandmasterIdentity;
pds->grandmasterClockQuality = msg->announce.grandmasterClockQuality;
pds->grandmasterPriority1 = msg->announce.grandmasterPriority1;
pds->grandmasterPriority2 = msg->announce.grandmasterPriority2;
c->tds.currentUtcOffset = msg->announce.currentUtcOffset;
c->tds.flags = msg->header.flagField[1];
c->tds.timeSource = msg->announce.timeSource;
if (!(c->tds.flags & PTP_TIMESCALE)) {
pr_warning("foreign master not using PTP timescale");
}
if (c->tds.currentUtcOffset < CURRENT_UTC_OFFSET) {
pr_warning("running in a temporal vortex");
}
clock_call_clock_update_cb(c, PARENT_DATA_SET, 1 /* MIB ID for ParentClockIdentity */, pds, sizeof(*pds));
}
static int clock_utc_correct(struct clock *c, tmv_t ingress)
{
struct timespec offset;
int utc_offset, leap, clock_leap;
uint64_t ts;
if (!c->utc_timescale)
return 0;
if (c->tds.flags & UTC_OFF_VALID && c->tds.flags & TIME_TRACEABLE) {
utc_offset = c->tds.currentUtcOffset;
} else if (c->tds.currentUtcOffset > CURRENT_UTC_OFFSET) {
utc_offset = c->tds.currentUtcOffset;
} else {
utc_offset = CURRENT_UTC_OFFSET;
}
if (c->tds.flags & LEAP_61) {
leap = 1;
} else if (c->tds.flags & LEAP_59) {
leap = -1;
} else {
leap = 0;
}
/* Handle leap seconds. */
if ((leap || c->leap_set) && c->clkid == CLOCK_REALTIME) {
/* If the clock will be stepped, the time stamp has to be the
target time. Ignore possible 1 second error in utc_offset. */
if (c->servo_state == SERVO_UNLOCKED) {
ts = tmv_to_nanoseconds(tmv_sub(ingress,
c->master_offset));
if (c->tds.flags & PTP_TIMESCALE)
ts -= utc_offset * NS_PER_SEC;
} else {
ts = tmv_to_nanoseconds(ingress);
}
/* Suspend clock updates in the last second before midnight. */
if (is_utc_ambiguous(ts)) {
pr_info("clock update suspended due to leap second");
return -1;
}
clock_leap = leap_second_status(ts, c->leap_set,
&leap, &utc_offset);
if (c->leap_set != clock_leap) {
if (c->kernel_leap)
sysclk_set_leap(clock_leap);
c->leap_set = clock_leap;
}
}
if (!(c->tds.flags & PTP_TIMESCALE))
return 0;
offset.tv_sec = utc_offset;
offset.tv_nsec = 0;
/* Local clock is UTC, but master is TAI. */
c->master_offset = tmv_add(c->master_offset, timespec_to_tmv(offset));
return 0;
}
static int forwarding(struct clock *c, struct port *p)
{
enum port_state ps = port_state(p);
switch (ps) {
case PS_MASTER:
case PS_GRAND_MASTER:
case PS_SLAVE:
case PS_UNCALIBRATED:
case PS_PRE_MASTER:
return 1;
default:
break;
}
if (p == c->port[c->nports] && ps != PS_FAULTY) { /*uds*/
return 1;
}
return 0;
}
/* public methods */
UInteger8 clock_class(struct clock *c)
{
return c->dds.clockQuality.clockClass;
}
struct clock *clock_create(int phc_index, struct interface *iface, int count,
enum timestamp_type timestamping, struct default_ds *dds,
enum servo_type servo)
{
int i, fadj = 0, max_adj = 0.0, sw_ts = timestamping == TS_SOFTWARE ? 1 : 0;
struct clock *c = &the_clock;
char phc[32];
struct interface *udsif = &c->uds_interface;
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
srandom(ts.tv_sec ^ ts.tv_nsec);
if (c->nports)
clock_destroy(c);
snprintf(udsif->name, sizeof(udsif->name), "%s", uds_path);
udsif->transport = TRANS_UDS;
udsif->delay_filter_length = 1;
c->port_update_cb = NULL;
c->free_running = dds->free_running;
c->freq_est_interval = dds->freq_est_interval;
c->grand_master_capable = dds->grand_master_capable;
c->kernel_leap = dds->kernel_leap;
c->utc_offset = CURRENT_UTC_OFFSET;
c->time_source = dds->time_source;
c->desc = dds->clock_desc;
memset(&c->status, 0, sizeof(c->status));
memset(&c->clksrc_fup_info, 0 , sizeof(c->clksrc_fup_info));
if (c->free_running) {
c->clkid = CLOCK_INVALID;
if (timestamping == TS_SOFTWARE || timestamping == TS_LEGACY_HW) {
c->utc_timescale = 1;
}
} else if (phc_index >= 0) {
snprintf(phc, 31, "/dev/ptp%d", phc_index);
c->clkid = phc_open(phc);
if (c->clkid == CLOCK_INVALID) {
pr_err("Failed to open %s: %m", phc);
return NULL;
}
max_adj = phc_max_adj(c->clkid);
if (!max_adj) {
pr_err("clock is not adjustable");
return NULL;
}
clockadj_init(c->clkid);
} else {
c->clkid = CLOCK_REALTIME;
c->utc_timescale = 1;
clockadj_init(c->clkid);
max_adj = sysclk_max_freq();
sysclk_set_leap(0);
}
c->leap_set = 0;
c->time_flags = c->utc_timescale ? 0 : PTP_TIMESCALE;
if (c->clkid != CLOCK_INVALID) {
fadj = (int) clockadj_get_freq(c->clkid);
/* Due to a bug in older kernels, the reading may silently fail
and return 0. Set the frequency back to make sure fadj is
the actual frequency of the clock. */
clockadj_set_freq(c->clkid, fadj);
}
c->servo = servo_create(servo, -fadj, max_adj, sw_ts);
if (!c->servo) {
pr_err("Failed to create clock servo");
return NULL;
}
c->servo_state = SERVO_UNLOCKED;
c->delay_filter = filter_create(dds->delay_filter,
dds->delay_filter_length);
if (!c->delay_filter) {
pr_err("Failed to create delay filter");
return NULL;
}
c->nrr = 1.0;
c->stats_interval = dds->stats_interval;
c->stats.offset = stats_create();
c->stats.freq = stats_create();
c->stats.delay = stats_create();
if (!c->stats.offset || !c->stats.freq || !c->stats.delay) {
pr_err("failed to create stats");
return NULL;
}
if (dds->sanity_freq_limit) {
c->sanity_check = clockcheck_create(dds->sanity_freq_limit);
if (!c->sanity_check) {
pr_err("Failed to create clock sanity check");
return NULL;
}
}
c->dds = dds->dds;
/* Initialize the parentDS. */
clock_update_grandmaster(c);
c->dad.pds.parentStats = 0;
c->dad.pds.observedParentOffsetScaledLogVariance = 0xffff;
c->dad.pds.observedParentClockPhaseChangeRate = 0x7fffffff;
c->dad.ptl = c->ptl;
for (i = 0; i < ARRAY_SIZE(c->pollfd); i++) {
c->pollfd[i].fd = -1;
c->pollfd[i].events = 0;
}
clock_sync_interval(c, 0);
LIST_INIT(&c->subscribers);
for (i = 0; i < count; i++) {
c->port[i] = port_open(phc_index, timestamping, 1+i, &iface[i], c);
if (!c->port[i]) {
pr_err("failed to open port %s", iface[i].name);
return NULL;
}
c->fault_fd[i] = timerfd_create(CLOCK_MONOTONIC, 0);
if (c->fault_fd[i] < 0) {
pr_err("timerfd_create failed: %m");
return NULL;
}
c->pollfd[N_CLOCK_PFD * i + N_POLLFD].fd = c->fault_fd[i];
c->pollfd[N_CLOCK_PFD * i + N_POLLFD].events = POLLIN|POLLPRI;
}
/*
* One extra port is for the UDS interface.
*/
c->port[i] = port_open(phc_index, timestamping, 0, udsif, c);
if (!c->port[i]) {
pr_err("failed to open the UDS port");
return NULL;
}
c->dds.numberPorts = c->nports = count;
for (i = 0; i < c->nports; i++)
port_dispatch(c->port[i], EV_INITIALIZE, 0);
port_dispatch(c->port[i], EV_INITIALIZE, 0); /*uds*/
return c;
}
struct dataset *clock_best_foreign(struct clock *c)
{
return c->best ? &c->best->dataset : NULL;
}
struct port *clock_best_port(struct clock *c)
{
return c->best ? c->best->port : NULL;
}
struct dataset *clock_default_ds(struct clock *c)
{
struct dataset *out = &c->default_dataset;
struct defaultDS *in = &c->dds;
out->priority1 = in->priority1;
out->identity = in->clockIdentity;
out->quality = in->clockQuality;
out->priority2 = in->priority2;
out->stepsRemoved = 0;
out->sender.clockIdentity = in->clockIdentity;
out->sender.portNumber = 0;
out->receiver.clockIdentity = in->clockIdentity;
out->receiver.portNumber = 0;
return out;
}
UInteger8 clock_domain_number(struct clock *c)
{
return c->dds.domainNumber;
}