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port.c
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port.c
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/**
* @file port.c
* @note Copyright (C) 2011 Richard Cochran <[email protected]>
*
* 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 <arpa/inet.h>
#include <errno.h>
#include <malloc.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "bmc.h"
#include "clock.h"
#include "mave.h"
#include "missing.h"
#include "msg.h"
#include "port.h"
#include "print.h"
#include "sk.h"
#include "tlv.h"
#include "tmtab.h"
#include "tmv.h"
#include "util.h"
#define PORT_MAVE_LENGTH 10
struct port {
char *name;
struct clock *clock;
struct transport *trp;
enum timestamp_type timestamping;
struct fdarray fda;
struct foreign_clock *best;
struct ptp_message *last_follow_up;
struct ptp_message *last_sync;
struct ptp_message *delay_req;
struct ptp_message *peer_delay_req;
struct ptp_message *peer_delay_resp;
struct ptp_message *peer_delay_fup;
struct {
UInteger16 announce;
UInteger16 delayreq;
UInteger16 sync;
} seqnum;
struct tmtab tmtab;
tmv_t peer_delay;
struct mave *avg_delay;
/* portDS */
struct port_defaults pod;
struct PortIdentity portIdentity;
enum port_state state; /*portState*/
Integer8 logMinDelayReqInterval;
TimeInterval peerMeanPathDelay;
Integer8 logAnnounceInterval;
UInteger8 announceReceiptTimeout;
UInteger8 transportSpecific;
Integer8 logSyncInterval;
Enumeration8 delayMechanism;
Integer8 logMinPdelayReqInterval;
unsigned int versionNumber; /*UInteger4*/
/* foreignMasterDS */
LIST_HEAD(fm, foreign_clock) foreign_masters;
};
#define portnum(p) (p->portIdentity.portNumber)
#define NSEC2SEC 1000000000LL
static int announce_compare(struct ptp_message *m1, struct ptp_message *m2)
{
struct announce_msg *a = &m1->announce, *b = &m2->announce;
int len =
sizeof(a->grandmasterPriority1) +
sizeof(a->grandmasterClockQuality) +
sizeof(a->grandmasterPriority2) +
sizeof(a->grandmasterIdentity) +
sizeof(a->stepsRemoved);
return memcmp(&a->grandmasterPriority1, &b->grandmasterPriority1, len);
}
static void announce_to_dataset(struct ptp_message *m, struct clock *c,
struct dataset *out)
{
struct announce_msg *a = &m->announce;
out->priority1 = a->grandmasterPriority1;
out->identity = a->grandmasterIdentity;
out->quality = a->grandmasterClockQuality;
out->priority2 = a->grandmasterPriority2;
out->stepsRemoved = a->stepsRemoved;
out->sender = m->header.sourcePortIdentity;
out->receiver = clock_parent_identity(c);
}
static int msg_current(struct ptp_message *m, struct timespec now)
{
int64_t t1, t2, tmo;
t1 = m->ts.host.tv_sec * NSEC2SEC + m->ts.host.tv_nsec;
t2 = now.tv_sec * NSEC2SEC + now.tv_nsec;
if (m->header.logMessageInterval < 0)
tmo = 4LL * NSEC2SEC / (1 << -m->header.logMessageInterval);
else
tmo = 4LL * (1 << m->header.logMessageInterval) * NSEC2SEC;
return t2 - t1 < tmo;
}
static int msg_source_equal(struct ptp_message *m1, struct foreign_clock *fc)
{
struct PortIdentity *id1, *id2;
id1 = &m1->header.sourcePortIdentity;
id2 = &fc->dataset.sender;
return 0 == memcmp(id1, id2, sizeof(*id1));
}
static int pid_eq(struct PortIdentity *a, struct PortIdentity *b)
{
return 0 == memcmp(a, b, sizeof(*a));
}
static int source_pid_eq(struct ptp_message *m1, struct ptp_message *m2)
{
return pid_eq(&m1->header.sourcePortIdentity,
&m2->header.sourcePortIdentity);
}
static int set_tmo(int fd, unsigned int scale, int log_seconds)
{
struct itimerspec tmo = {
{0, 0}, {0, 0}
};
uint64_t ns;
int i;
if (log_seconds < 0) {
log_seconds *= -1;
for (i = 1, ns = scale * 500000000ULL; i < log_seconds; i++) {
ns >>= 1;
}
tmo.it_value.tv_nsec = ns;
while (tmo.it_value.tv_nsec >= NS_PER_SEC) {
tmo.it_value.tv_nsec -= NS_PER_SEC;
tmo.it_value.tv_sec++;
}
} else
tmo.it_value.tv_sec = scale * (1 << log_seconds);
return timerfd_settime(fd, 0, &tmo, NULL);
}
static void fc_clear(struct foreign_clock *fc)
{
struct ptp_message *m;
while (fc->n_messages) {
m = TAILQ_LAST(&fc->messages, messages);
TAILQ_REMOVE(&fc->messages, m, list);
fc->n_messages--;
msg_put(m);
}
}
static void fc_prune(struct foreign_clock *fc)
{
struct timespec now;
struct ptp_message *m;
clock_gettime(CLOCK_MONOTONIC, &now);
while (fc->n_messages > FOREIGN_MASTER_THRESHOLD) {
m = TAILQ_LAST(&fc->messages, messages);
TAILQ_REMOVE(&fc->messages, m, list);
fc->n_messages--;
msg_put(m);
}
while (!TAILQ_EMPTY(&fc->messages)) {
m = TAILQ_LAST(&fc->messages, messages);
if (msg_current(m, now))
break;
TAILQ_REMOVE(&fc->messages, m, list);
fc->n_messages--;
msg_put(m);
}
}
static void ts_to_timestamp(struct timespec *src, struct Timestamp *dst)
{
dst->seconds_lsb = src->tv_sec;
dst->seconds_msb = 0;
dst->nanoseconds = src->tv_nsec;
}
/*
* Returns non-zero if the announce message is different than last.
*/
static int add_foreign_master(struct port *p, struct ptp_message *m)
{
struct foreign_clock *fc;
struct ptp_message *tmp;
int broke_threshold = 0, diff = 0;
LIST_FOREACH(fc, &p->foreign_masters, list) {
if (msg_source_equal(m, fc))
break;
}
if (!fc) {
pr_notice("port %hu: new foreign master %s", portnum(p),
pid2str(&m->header.sourcePortIdentity));
fc = malloc(sizeof(*fc));
if (!fc) {
pr_err("low memory, failed to add foreign master");
return 0;
}
memset(fc, 0, sizeof(*fc));
LIST_INSERT_HEAD(&p->foreign_masters, fc, list);
fc->port = p;
fc->dataset.sender = m->header.sourcePortIdentity;
/* We do not count this first message, see 9.5.3(b) */
return 0;
}
/*
* If this message breaks the threshold, that is an important change.
*/
fc_prune(fc);
if (FOREIGN_MASTER_THRESHOLD - 1 == fc->n_messages)
broke_threshold = 1;
/*
* Okay, go ahead and add this announcement.
*/
msg_get(m);
fc->n_messages++;
TAILQ_INSERT_HEAD(&fc->messages, m, list);
/*
* Test if this announcement contains changed information.
*/
if (fc->n_messages > 1) {
tmp = TAILQ_NEXT(m, list);
diff = announce_compare(m, tmp);
}
return broke_threshold || diff;
}
static void free_foreign_masters(struct port *p)
{
struct foreign_clock *fc;
while ((fc = LIST_FIRST(&p->foreign_masters)) != NULL) {
LIST_REMOVE(fc, list);
fc_clear(fc);
free(fc);
}
}
static int path_trace_append(struct port *p, struct ptp_message *m,
struct parentDS *dad)
{
struct path_trace_tlv *ptt;
int length = 1 + dad->path_length;
if (length > PATH_TRACE_MAX) {
return 0;
}
ptt = (struct path_trace_tlv *) m->announce.suffix;
ptt->type = TLV_PATH_TRACE;
ptt->length = length * sizeof(struct ClockIdentity);
memcpy(ptt->cid, dad->ptl, ptt->length);
ptt->cid[length - 1] = clock_identity(p->clock);
m->tlv_count = 1;
return ptt->length + sizeof(ptt->type) + sizeof(ptt->length);
}
static int path_trace_ignore(struct port *p, struct ptp_message *m)
{
struct ClockIdentity cid;
struct path_trace_tlv *ptt;
int i, cnt;
if (!p->pod.path_trace_enabled) {
return 0;
}
if (msg_type(m) != ANNOUNCE) {
return 0;
}
if (m->tlv_count != 1) {
return 1;
}
ptt = (struct path_trace_tlv *) m->announce.suffix;
if (ptt->type != TLV_PATH_TRACE) {
return 1;
}
cnt = path_length(ptt);
cid = clock_identity(p->clock);
for (i = 0; i < cnt; i++) {
if (0 == memcmp(&ptt->cid[i], &cid, sizeof(cid)))
return 1;
}
return 0;
}
static int port_clr_tmo(int fd)
{
struct itimerspec tmo = {
{0, 0}, {0, 0}
};
return timerfd_settime(fd, 0, &tmo, NULL);
}
static int port_ignore(struct port *p, struct ptp_message *m)
{
struct ClockIdentity c1, c2;
if (path_trace_ignore(p, m)) {
return 1;
}
if (msg_transport_specific(m) != p->transportSpecific) {
return 1;
}
if (pid_eq(&m->header.sourcePortIdentity, &p->portIdentity)) {
return 1;
}
if (m->header.domainNumber != clock_domain_number(p->clock)) {
return 1;
}
c1 = clock_identity(p->clock);
c2 = m->header.sourcePortIdentity.clockIdentity;
if (0 == memcmp(&c1, &c2, sizeof(c1))) {
return 1;
}
return 0;
}
static int port_set_announce_tmo(struct port *p)
{
return set_tmo(p->fda.fd[FD_ANNOUNCE_TIMER],
p->announceReceiptTimeout, p->logAnnounceInterval);
}
static int port_set_delay_tmo(struct port *p)
{
struct itimerspec tmo = {
{0, 0}, {0, 0}
};
int index = random() % TMTAB_MAX;
tmo.it_value = p->tmtab.ts[index];
return timerfd_settime(p->fda.fd[FD_DELAY_TIMER], 0, &tmo, NULL);
}
static int port_set_manno_tmo(struct port *p)
{
return set_tmo(p->fda.fd[FD_MANNO_TIMER], 1, p->logAnnounceInterval);
}
static int port_set_qualification_tmo(struct port *p)
{
return set_tmo(p->fda.fd[FD_QUALIFICATION_TIMER],
1+clock_steps_removed(p->clock), p->logAnnounceInterval);
}
static int port_set_sync_tmo(struct port *p)
{
return set_tmo(p->fda.fd[FD_SYNC_TIMER], 1, p->logSyncInterval);
}
static void port_show_transition(struct port *p,
enum port_state next, enum fsm_event event)
{
pr_notice("port %hu: %s to %s on %s", portnum(p),
ps_str[p->state], ps_str[next], ev_str[event]);
}
static void port_synchronize(struct port *p,
struct timespec ingress_ts,
struct timestamp origin_ts,
Integer64 correction1, Integer64 correction2)
{
enum servo_state state;
state = clock_synchronize(p->clock, ingress_ts, origin_ts,
correction1, correction2);
switch (state) {
case SERVO_UNLOCKED:
case SERVO_JUMP:
port_dispatch(p, EV_SYNCHRONIZATION_FAULT, 0);
break;
case SERVO_LOCKED:
port_dispatch(p, EV_MASTER_CLOCK_SELECTED, 0);
break;
}
}
static int port_pdelay_request(struct port *p)
{
struct ptp_message *msg;
int cnt, pdulen;
msg = msg_allocate();
if (!msg)
return -1;
pdulen = sizeof(struct pdelay_req_msg);
msg->hwts.type = p->timestamping;
msg->header.tsmt = PDELAY_REQ | p->transportSpecific;
msg->header.ver = PTP_VERSION;
msg->header.messageLength = pdulen;
msg->header.domainNumber = clock_domain_number(p->clock);
msg->header.sourcePortIdentity = p->portIdentity;
msg->header.sequenceId = p->seqnum.delayreq++;
msg->header.control = CTL_OTHER;
msg->header.logMessageInterval = 0x7f;
if (msg_pre_send(msg))
goto out;
cnt = transport_peer(p->trp, &p->fda, 1, msg, pdulen, &msg->hwts);
if (cnt <= 0) {
pr_err("port %hu: send peer delay request failed", portnum(p));
goto out;
}
if (msg_sots_missing(msg)) {
pr_err("missing timestamp on transmitted peer delay request");
goto out;
}
if (p->peer_delay_req)
msg_put(p->peer_delay_req);
p->peer_delay_req = msg;
return 0;
out:
msg_put(msg);
return -1;
}
static int port_delay_request(struct port *p)
{
struct ptp_message *msg;
int cnt, pdulen;
if (p->delayMechanism == DM_P2P)
return port_pdelay_request(p);
msg = msg_allocate();
if (!msg)
return -1;
pdulen = sizeof(struct delay_req_msg);
msg->hwts.type = p->timestamping;
msg->header.tsmt = DELAY_REQ | p->transportSpecific;
msg->header.ver = PTP_VERSION;
msg->header.messageLength = pdulen;
msg->header.domainNumber = clock_domain_number(p->clock);
msg->header.sourcePortIdentity = p->portIdentity;
msg->header.sequenceId = p->seqnum.delayreq++;
msg->header.control = CTL_DELAY_REQ;
msg->header.logMessageInterval = 0x7f;
if (msg_pre_send(msg))
goto out;
cnt = transport_send(p->trp, &p->fda, 1, msg, pdulen, &msg->hwts);
if (cnt <= 0) {
pr_err("port %hu: send delay request failed", portnum(p));
goto out;
}
if (msg_sots_missing(msg)) {
pr_err("missing timestamp on transmitted delay request");
goto out;
}
if (p->delay_req)
msg_put(p->delay_req);
p->delay_req = msg;
return 0;
out:
msg_put(msg);
return -1;
}
static int port_tx_announce(struct port *p)
{
struct parentDS *dad = clock_parent_ds(p->clock);
struct timePropertiesDS *tp = clock_time_properties(p->clock);
struct ptp_message *msg;
int cnt, err = 0, pdulen;
msg = msg_allocate();
if (!msg)
return -1;
pdulen = sizeof(struct announce_msg);
msg->hwts.type = p->timestamping;
if (p->pod.path_trace_enabled)
pdulen += path_trace_append(p, msg, dad);
msg->header.tsmt = ANNOUNCE | p->transportSpecific;
msg->header.ver = PTP_VERSION;
msg->header.messageLength = pdulen;
msg->header.domainNumber = clock_domain_number(p->clock);
msg->header.sourcePortIdentity = p->portIdentity;
msg->header.sequenceId = p->seqnum.announce++;
msg->header.control = CTL_OTHER;
msg->header.logMessageInterval = p->logAnnounceInterval;
if (tp->leap61)
msg->header.flagField[1] |= LEAP_61;
if (tp->leap59)
msg->header.flagField[1] |= LEAP_59;
if (tp->currentUtcOffsetValid)
msg->header.flagField[1] |= UTC_OFF_VALID;
if (tp->ptpTimescale)
msg->header.flagField[1] |= PTP_TIMESCALE;
if (tp->timeTraceable)
msg->header.flagField[1] |= TIME_TRACEABLE;
if (tp->frequencyTraceable)
msg->header.flagField[1] |= FREQ_TRACEABLE;
msg->announce.currentUtcOffset = tp->currentUtcOffset;
msg->announce.grandmasterPriority1 = dad->grandmasterPriority1;
msg->announce.grandmasterClockQuality = dad->grandmasterClockQuality;
msg->announce.grandmasterPriority2 = dad->grandmasterPriority2;
msg->announce.grandmasterIdentity = dad->grandmasterIdentity;
msg->announce.stepsRemoved = clock_steps_removed(p->clock);
msg->announce.timeSource = tp->timeSource;
if (msg_pre_send(msg)) {
err = -1;
goto out;
}
cnt = transport_send(p->trp, &p->fda, 0, msg, pdulen, &msg->hwts);
if (cnt <= 0) {
pr_err("port %hu: send announce failed", portnum(p));
err = -1;
}
out:
msg_put(msg);
return err;
}
static int port_tx_sync(struct port *p)
{
struct ptp_message *msg, *fup;
int cnt, err = 0, pdulen;
msg = msg_allocate();
if (!msg)
return -1;
fup = msg_allocate();
if (!fup) {
msg_put(msg);
return -1;
}
pdulen = sizeof(struct sync_msg);
msg->hwts.type = p->timestamping;
msg->header.tsmt = SYNC | p->transportSpecific;
msg->header.ver = PTP_VERSION;
msg->header.messageLength = pdulen;
msg->header.domainNumber = clock_domain_number(p->clock);
msg->header.sourcePortIdentity = p->portIdentity;
msg->header.sequenceId = p->seqnum.sync++;
msg->header.control = CTL_SYNC;
msg->header.logMessageInterval = p->logSyncInterval;
msg->header.flagField[0] |= TWO_STEP;
if (msg_pre_send(msg)) {
err = -1;
goto out;
}
cnt = transport_send(p->trp, &p->fda, 1, msg, pdulen, &msg->hwts);
if (cnt <= 0) {
pr_err("port %hu: send sync failed", portnum(p));
err = -1;
goto out;
}
if (msg_sots_missing(msg)) {
pr_err("missing timestamp on transmitted sync");
err = -1;
goto out;
}
/*
* Send the follow up message right away.
*/
pdulen = sizeof(struct follow_up_msg);
fup->hwts.type = p->timestamping;
fup->header.tsmt = FOLLOW_UP | p->transportSpecific;
fup->header.ver = PTP_VERSION;
fup->header.messageLength = pdulen;
fup->header.domainNumber = clock_domain_number(p->clock);
fup->header.sourcePortIdentity = p->portIdentity;
fup->header.sequenceId = p->seqnum.sync - 1;
fup->header.control = CTL_FOLLOW_UP;
fup->header.logMessageInterval = p->logSyncInterval;
ts_to_timestamp(&msg->hwts.ts, &fup->follow_up.preciseOriginTimestamp);
if (msg_pre_send(fup)) {
err = -1;
goto out;
}
cnt = transport_send(p->trp, &p->fda, 0, fup, pdulen, &fup->hwts);
if (cnt <= 0) {
pr_err("port %hu: send follow up failed", portnum(p));
err = -1;
}
out:
msg_put(msg);
msg_put(fup);
return err;
}
/*
* port initialize and disable
*/
static int port_is_enabled(struct port *p)
{
switch (p->state) {
case PS_INITIALIZING:
case PS_FAULTY:
case PS_DISABLED:
return 0;
case PS_LISTENING:
case PS_PRE_MASTER:
case PS_MASTER:
case PS_GRAND_MASTER:
case PS_PASSIVE:
case PS_UNCALIBRATED:
case PS_SLAVE:
break;
}
return 1;
}
static void port_disable(struct port *p)
{
int i;
if (p->last_follow_up) {
msg_put(p->last_follow_up);
p->last_follow_up = NULL;
}
if (p->last_sync) {
msg_put(p->last_sync);
p->last_sync = NULL;
}
if (p->delay_req) {
msg_put(p->delay_req);
p->delay_req = NULL;
}
if (p->peer_delay_req) {
msg_put(p->peer_delay_req);
p->peer_delay_req = NULL;
}
if (p->peer_delay_resp) {
msg_put(p->peer_delay_resp);
p->peer_delay_resp = NULL;
}
if (p->peer_delay_fup) {
msg_put(p->peer_delay_fup);
p->peer_delay_fup = NULL;
}
free_foreign_masters(p);
clock_remove_fda(p->clock, p, p->fda);
transport_close(p->trp, &p->fda);
for (i = 0; i < N_TIMER_FDS; i++) {
close(p->fda.fd[FD_ANNOUNCE_TIMER + i]);
}
}
static int port_initialize(struct port *p)
{
int fd[N_TIMER_FDS], i;
p->logMinDelayReqInterval = p->pod.logMinDelayReqInterval;
p->peerMeanPathDelay = 0;
p->logAnnounceInterval = p->pod.logAnnounceInterval;
p->announceReceiptTimeout = p->pod.announceReceiptTimeout;
p->transportSpecific = p->pod.transportSpecific;
p->logSyncInterval = p->pod.logSyncInterval;
p->logMinPdelayReqInterval = p->pod.logMinPdelayReqInterval;
tmtab_init(&p->tmtab, 1 + p->logMinDelayReqInterval);
for (i = 0; i < N_TIMER_FDS; i++) {
fd[i] = -1;
}
for (i = 0; i < N_TIMER_FDS; i++) {
fd[i] = timerfd_create(CLOCK_MONOTONIC, 0);
if (fd[i] < 0) {
pr_err("timerfd_create: %s", strerror(errno));
goto no_timers;
}
}
if (transport_open(p->trp, p->name, &p->fda, p->timestamping))
goto no_tropen;
for (i = 0; i < N_TIMER_FDS; i++) {
p->fda.fd[FD_ANNOUNCE_TIMER + i] = fd[i];
}
if (port_set_announce_tmo(p))
goto no_tmo;
clock_install_fda(p->clock, p, p->fda);
return 0;
no_tmo:
transport_close(p->trp, &p->fda);
no_tropen:
no_timers:
for (i = 0; i < N_TIMER_FDS; i++) {
if (fd[i] >= 0)
close(fd[i]);
}
return -1;
}
static int port_renew_transport(struct port *p)
{
if (!port_is_enabled(p)) {
return 0;
}
clock_remove_fda(p->clock, p, p->fda);
transport_close(p->trp, &p->fda);
if (transport_open(p->trp, p->name, &p->fda, p->timestamping)) {
return -1;
}
clock_install_fda(p->clock, p, p->fda);
return 0;
}
/*
* Returns non-zero if the announce message is different than last.
*/
static int update_current_master(struct port *p, struct ptp_message *m)
{
struct foreign_clock *fc = p->best;
struct ptp_message *tmp;
struct parentDS *dad;
struct path_trace_tlv *ptt;
if (!msg_source_equal(m, fc))
return add_foreign_master(p, m);
if (p->pod.path_trace_enabled) {
ptt = (struct path_trace_tlv *) m->announce.suffix;
dad = clock_parent_ds(p->clock);
memcpy(dad->ptl, ptt->cid, ptt->length);
dad->path_length = path_length(ptt);
}
port_set_announce_tmo(p);
fc_prune(fc);
msg_get(m);
fc->n_messages++;
TAILQ_INSERT_HEAD(&fc->messages, m, list);
if (fc->n_messages > 1) {
tmp = TAILQ_NEXT(m, list);
return announce_compare(m, tmp);
}
return 0;
}
struct dataset *port_best_foreign(struct port *port)
{
return port->best ? &port->best->dataset : NULL;
}
/* message processing routines */
/*
* Returns non-zero if the announce message is both qualified and different.
*/
static int process_announce(struct port *p, struct ptp_message *m)
{
int result = 0;
switch (p->state) {
case PS_INITIALIZING:
case PS_FAULTY:
case PS_DISABLED:
break;
case PS_LISTENING:
case PS_PRE_MASTER:
case PS_MASTER:
case PS_GRAND_MASTER:
case PS_PASSIVE:
result = add_foreign_master(p, m);
break;
case PS_UNCALIBRATED:
case PS_SLAVE:
result = update_current_master(p, m);
break;
}
return result;
}
static int process_delay_req(struct port *p, struct ptp_message *m)
{
struct ptp_message *msg;
int cnt, err = 0, pdulen;
if (p->state != PS_MASTER && p->state != PS_GRAND_MASTER)
return 0;
if (p->delayMechanism == DM_P2P) {
pr_warning("port %hu: delay request on P2P port", portnum(p));
return 0;
}
msg = msg_allocate();
if (!msg)
return -1;
pdulen = sizeof(struct delay_resp_msg);
msg->hwts.type = p->timestamping;
msg->header.tsmt = DELAY_RESP | p->transportSpecific;
msg->header.ver = PTP_VERSION;
msg->header.messageLength = pdulen;
msg->header.domainNumber = m->header.domainNumber;
msg->header.correction = m->header.correction;
msg->header.sourcePortIdentity = p->portIdentity;
msg->header.sequenceId = m->header.sequenceId;
msg->header.control = CTL_DELAY_RESP;
msg->header.logMessageInterval = p->logMinDelayReqInterval;
ts_to_timestamp(&m->hwts.ts, &msg->delay_resp.receiveTimestamp);
msg->delay_resp.requestingPortIdentity = m->header.sourcePortIdentity;
if (msg_pre_send(msg)) {
err = -1;
goto out;
}
cnt = transport_send(p->trp, &p->fda, 0, msg, pdulen, NULL);
if (cnt <= 0) {
pr_err("port %hu: send delay response failed", portnum(p));
err = -1;
}
out:
msg_put(msg);
return err;
}
static void process_delay_resp(struct port *p, struct ptp_message *m)
{
struct delay_req_msg *req;
struct delay_resp_msg *rsp = &m->delay_resp;
if (!p->delay_req)
return;
req = &p->delay_req->delay_req;
if (p->state != PS_UNCALIBRATED && p->state != PS_SLAVE)
return;
if (!pid_eq(&rsp->requestingPortIdentity, &req->hdr.sourcePortIdentity))
return;
if (rsp->hdr.sequenceId != ntohs(req->hdr.sequenceId))
return;
clock_path_delay(p->clock, p->delay_req->hwts.ts, m->ts.pdu,
m->header.correction);
if (p->logMinDelayReqInterval != rsp->hdr.logMessageInterval) {
// TODO - validate the input.
p->logMinDelayReqInterval = rsp->hdr.logMessageInterval;
pr_notice("port %hu: minimum delay request interval 2^%d",
portnum(p), p->logMinDelayReqInterval);
tmtab_init(&p->tmtab, 1 + p->logMinDelayReqInterval);
}
}
static void process_follow_up(struct port *p, struct ptp_message *m)
{
struct ptp_message *syn;
struct PortIdentity master, *pid;
switch (p->state) {
case PS_INITIALIZING:
case PS_FAULTY:
case PS_DISABLED:
case PS_LISTENING:
case PS_PRE_MASTER:
case PS_MASTER:
case PS_GRAND_MASTER:
case PS_PASSIVE:
return;
case PS_UNCALIBRATED:
case PS_SLAVE:
break;
}
master = clock_parent_identity(p->clock);
if (memcmp(&master, &m->header.sourcePortIdentity, sizeof(master)))
return;
/*
* Handle out of order packets. The network stack might
* provide the follow up _before_ the sync message. After all,
* they can arrive on two different ports. In addition, time
* stamping in PHY devices might delay the event packets.
*/
syn = p->last_sync;
if (!syn || syn->header.sequenceId != m->header.sequenceId) {
if (p->last_follow_up)
msg_put(p->last_follow_up);
msg_get(m);
p->last_follow_up = m;
return;
}
pid = &syn->header.sourcePortIdentity;
if (memcmp(pid, &m->header.sourcePortIdentity, sizeof(*pid)))
return;
port_synchronize(p, syn->hwts.ts, m->ts.pdu,
syn->header.correction, m->header.correction);
}
static int process_pdelay_req(struct port *p, struct ptp_message *m)
{
struct ptp_message *rsp, *fup;
int cnt, err = -1, rsp_len, fup_len;
if (p->delayMechanism == DM_E2E) {
pr_warning("port %hu: pdelay_req on E2E port", portnum(p));
return 0;
}
if (p->delayMechanism == DM_AUTO) {
pr_info("port %hu: peer detected, switch to P2P", portnum(p));
p->delayMechanism = DM_P2P;
}
rsp = msg_allocate();
if (!rsp)
return -1;
fup = msg_allocate();
if (!fup) {
msg_put(rsp);
return -1;
}
rsp_len = sizeof(struct pdelay_resp_msg);
rsp->hwts.type = p->timestamping;
rsp->header.tsmt = PDELAY_RESP | p->transportSpecific;
rsp->header.ver = PTP_VERSION;
rsp->header.messageLength = rsp_len;
rsp->header.domainNumber = m->header.domainNumber;
rsp->header.sourcePortIdentity = p->portIdentity;
rsp->header.sequenceId = m->header.sequenceId;
rsp->header.control = CTL_OTHER;
rsp->header.logMessageInterval = 0x7f;
rsp->header.flagField[0] |= TWO_STEP;
/*
* NB - We do not have any fraction nanoseconds for the correction
* fields, neither in the response or the follow up.
*/
ts_to_timestamp(&m->hwts.ts, &rsp->pdelay_resp.requestReceiptTimestamp);
rsp->pdelay_resp.requestingPortIdentity = m->header.sourcePortIdentity;
fup_len = sizeof(struct pdelay_resp_fup_msg);
fup->hwts.type = p->timestamping;
fup->header.tsmt = PDELAY_RESP_FOLLOW_UP | p->transportSpecific;
fup->header.ver = PTP_VERSION;