Drop tmtab module.
Instead of maintaining a table of precalculated values, use the newly added set_tmo_random() function to set the delay request timeout. It saves some memory and improves the timeout granularity, but has a higher computational cost. It follows the requirements from section 9.5.11.2 of the spec. Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>master
parent
e425da2f17
commit
23d31d090e
2
makefile
2
makefile
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@ -25,7 +25,7 @@ LDLIBS = -lm -lrt $(EXTRA_LDFLAGS)
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PRG = ptp4l pmc phc2sys hwstamp_ctl
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OBJ = bmc.o clock.o clockadj.o clockcheck.o config.o fault.o \
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fsm.o ptp4l.o mave.o msg.o phc.o pi.o port.o print.o raw.o servo.o \
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sk.o stats.o tlv.o tmtab.o transport.o udp.o udp6.o uds.o util.o version.o
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sk.o stats.o tlv.o transport.o udp.o udp6.o uds.o util.o version.o
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OBJECTS = $(OBJ) hwstamp_ctl.o phc2sys.o pmc.o pmc_common.o sysoff.o
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SRC = $(OBJECTS:.o=.c)
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15
port.c
15
port.c
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@ -32,7 +32,6 @@
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#include "print.h"
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#include "sk.h"
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#include "tlv.h"
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#include "tmtab.h"
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#include "tmv.h"
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#include "util.h"
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@ -80,7 +79,6 @@ struct port {
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UInteger16 delayreq;
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UInteger16 sync;
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} seqnum;
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struct tmtab tmtab;
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tmv_t peer_delay;
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struct mave *avg_delay;
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int log_sync_interval;
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@ -815,17 +813,13 @@ static int port_set_announce_tmo(struct port *p)
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static int port_set_delay_tmo(struct port *p)
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{
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struct itimerspec tmo = {
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{0, 0}, {0, 0}
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};
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int index;
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if (p->delayMechanism == DM_P2P) {
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return set_tmo_log(p->fda.fd[FD_DELAY_TIMER], 1,
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p->logMinPdelayReqInterval);
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} else {
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return set_tmo_random(p->fda.fd[FD_DELAY_TIMER], 0, 2,
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p->logMinDelayReqInterval);
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}
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index = random() % TMTAB_MAX;
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tmo.it_value = p->tmtab.ts[index];
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return timerfd_settime(p->fda.fd[FD_DELAY_TIMER], 0, &tmo, NULL);
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}
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static int port_set_manno_tmo(struct port *p)
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@ -1327,8 +1321,6 @@ static int port_initialize(struct port *p)
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p->logMinPdelayReqInterval = p->pod.logMinPdelayReqInterval;
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p->neighborPropDelayThresh = p->pod.neighborPropDelayThresh;
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tmtab_init(&p->tmtab, 1 + p->logMinDelayReqInterval);
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for (i = 0; i < N_TIMER_FDS; i++) {
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fd[i] = -1;
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}
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@ -1534,7 +1526,6 @@ static void process_delay_resp(struct port *p, struct ptp_message *m)
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p->logMinDelayReqInterval = rsp->hdr.logMessageInterval;
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pr_notice("port %hu: minimum delay request interval 2^%d",
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portnum(p), p->logMinDelayReqInterval);
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tmtab_init(&p->tmtab, 1 + p->logMinDelayReqInterval);
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}
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}
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54
tmtab.c
54
tmtab.c
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@ -1,54 +0,0 @@
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/**
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* @file tmtab.c
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* @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "tmtab.h"
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#include "tmv.h"
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void tmtab_init(struct tmtab *tt, int log_seconds)
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{
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int i;
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struct timespec incr, ts = {0, 0};
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uint64_t max, min;
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if (log_seconds < 0) {
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log_seconds *= -1;
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for (i = 1, max = 500000000ULL; i < log_seconds; i++) {
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max >>= 1;
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}
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} else {
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for (i = 0, max = 1000000000ULL; i < log_seconds; i++) {
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max <<= 1;
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}
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}
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min = max / (TMTAB_MAX - 1ULL);
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incr.tv_sec = min / 1000000000ULL;
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incr.tv_nsec = min % 1000000000ULL;
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for (i = 0; i < TMTAB_MAX; i++) {
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ts.tv_sec += incr.tv_sec;
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ts.tv_nsec += incr.tv_nsec;
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while (ts.tv_nsec >= NS_PER_SEC) {
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ts.tv_nsec -= NS_PER_SEC;
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ts.tv_sec++;
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}
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tt->ts[i] = ts;
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}
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}
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56
tmtab.h
56
tmtab.h
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@ -1,56 +0,0 @@
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/**
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* @file tmtab.h
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* @brief Implements a table of time out values.
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* @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef HAVE_TMTAB_H
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#define HAVE_TMTAB_H
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#include <time.h>
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/*
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* Let 'D' be the logMinDelayReqInterval
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* and 'S' be the logSyncInterval.
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*
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* The delay request interval ranges from zero to 2^{D+1} seconds.
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* The standard requires that
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*
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* S <= D <= S+5
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*
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* and the timeout granularity not more than 2^{S-4} seconds.
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* Thus, the minimum required number of grains is given by
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*
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* 2^{D+1} / 2^{S-4} = 2^{D-S+5}
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*
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* and finds a minimum of 2^5 and a maximum of 2^10.
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*
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* The timeout table allows for the maximum number of grains required.
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*
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* Note that the table is made to be biased so that when sampling the
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* table randomly, the average delay value will be slightly larger
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* than logMinDelayReqInterval, in order to satisfy the wording of the
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* standard.
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*/
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#define TMTAB_MAX 1024
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struct tmtab {
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struct timespec ts[TMTAB_MAX];
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};
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void tmtab_init(struct tmtab *tt, int log_seconds);
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#endif
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Loading…
Reference in New Issue