Add random delay to announce timeout.
According to 9.2.6.11 of the spec the ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES timeout in addition to announceReceiptTimeoutInterval includes a random number up to one announceInterval. Add a new function for setting random timeout and use it in port_set_announce_tmo(). Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>master
parent
ed379b4028
commit
e425da2f17
27
port.c
27
port.c
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@ -231,6 +231,29 @@ int set_tmo_lin(int fd, int seconds)
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return timerfd_settime(fd, 0, &tmo, NULL);
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}
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int set_tmo_random(int fd, int min, int span, int log_seconds)
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{
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uint64_t value_ns, min_ns, span_ns;
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struct itimerspec tmo = {
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{0, 0}, {0, 0}
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};
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if (log_seconds >= 0) {
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min_ns = min * NS_PER_SEC << log_seconds;
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span_ns = span * NS_PER_SEC << log_seconds;
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} else {
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min_ns = min * NS_PER_SEC >> -log_seconds;
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span_ns = span * NS_PER_SEC >> -log_seconds;
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}
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value_ns = min_ns + (span_ns * (random() % (1 << 15) + 1) >> 15);
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tmo.it_value.tv_sec = value_ns / NS_PER_SEC;
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tmo.it_value.tv_nsec = value_ns % NS_PER_SEC;
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return timerfd_settime(fd, 0, &tmo, NULL);
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}
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static void fc_clear(struct foreign_clock *fc)
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{
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struct ptp_message *m;
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@ -786,8 +809,8 @@ static void port_nrate_initialize(struct port *p)
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static int port_set_announce_tmo(struct port *p)
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{
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return set_tmo_log(p->fda.fd[FD_ANNOUNCE_TIMER],
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p->announceReceiptTimeout, p->logAnnounceInterval);
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return set_tmo_random(p->fda.fd[FD_ANNOUNCE_TIMER],
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p->announceReceiptTimeout, 1, p->logAnnounceInterval);
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}
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static int port_set_delay_tmo(struct port *p)
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15
port.h
15
port.h
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@ -173,6 +173,21 @@ enum port_state port_state(struct port *port);
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*/
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int set_tmo_log(int fd, unsigned int scale, int log_seconds);
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/**
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* Utility function for setting a file descriptor timer.
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*
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* This function sets the timer 'fd' to a random value between M * 2^N and
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* (M + S) * 2^N, where M is the value of the 'min' parameter, S is the value
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* of the 'span' parameter, and N in the value of the 'log_seconds' parameter.
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*
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* @param fd A file descriptor previously opened with timerfd_create(2).
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* @param min The minimum value for the timer.
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* @param span The span value for the timer. Must be a positive value.
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* @param log_seconds The exponential factor for the timer.
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* @return Zero on success, non-zero otherwise.
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*/
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int set_tmo_random(int fd, int min, int span, int log_seconds);
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/**
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* Utility function for setting or resetting a file descriptor timer.
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*
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