According to 1588, PTP message loops are simply someone else's problem
with respect to transparent clocks. Since we are running the BMCA for
syntonization anyway, we might as well go ahead and implement the spanning
tree for PTP messages.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
This patch adds a new configuation option that enables transparent
clock mode. When TC mode is specified, the configured delay mechanism
must also match. The legacy behavior of upgrading a multi-port clock
from OC to BC is preserved.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
When masterOnly is true, the port always returns NULL when computing
its best foreign master. As a result, the port will never enter the
SLAVE state, and the clock will ignore Announce messages received on
that port.
This attribute is specifically called out in G.8275.1 and G.8275.2,
and it is implied by the "master only" mode G.8265.1. In addition,
this option will probably appear in the next revision of IEEE 1588.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Up until now the transportSpecific field has been treated according to
802.1AS, namely as a field that must match exactly on receive.
However, 1588 mandates ignoring this field for some transports, and
there is equipment in the wild that does in fact set the reserved
bits.
This patch adds an option to ignore the field on receive completely.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Reported-by: Petr Kulhavy <brain@jikos.cz>
This option allows the clock to be updated before the path delay is
measured in order to speed up the initial correction of the clock, e.g.
in domains using a very long logMinDelayReqInterval.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
When running multiple instances of ptp4l or phc2sys, it's difficult to
tell which log message belongs to which instance. Add new options to
ptp4l and phc2sys which can specify a tag for all messages printed to
the standard output or system log, so messages from different instances
can have different tags.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Currently UTC offset is defined as a constant - CURRENT_UTC_OFFSET, and if
a leap second is added, that constant is no longer valid. Ptp4l was
updated to read the UTC offset from configuration instead.
Signed-off-by: Viliam Lejcik <viliam.lejcik@kistler.com>
In the last years there are several media streaming standards
evolving that are relying on PTP. These standards make requirements
about the DSCP priority of PTP messages. This patch introduces two
new configuration options 'dscp_event' and 'dscp_general' to address
that issue and to be able to set the DSCP priority separately for
PTP event messages and PTP general messages.
Signed-off-by: Henry Jesuiter <henry.jesuiter@alcnetworx.de>
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
The -p option for ptp4l, which specifies the PHC device, was added
before the ethtool get_ts_info ioctl had been invented. Today it does
not "force" the given device as the man page says. Instead this is a
legacy option only useful when running on older kernels.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
The draft Enterprise Profile [1] specifies a hybrid E2E delay mechanism,
where the delay response message is sent "in kind". That is, if the
request is unicast, then the response is also unicast. Apparently this
scheme is already in widespread use in some industries. Also, it makes
sense, because those messages are of no interest to the other slaves in
the PTP network.
Because of the address work already in place, in turns out that adding
this mode is almost trivial. This patch introduces an "hybrid_e2e" option
that enabled the new mode.
1. https://datatracker.ietf.org/doc/draft-ietf-tictoc-ptp-enterprise-profile
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Add new time stamp processing modes to return raw delay and offset based
on the raw delay instead of the long-term filtered delay, and to return
also a weight of the sample. The weight is set to the ratio between the
two delays. This gives smaller weight to samples where the sync and/or
delay messages were delayed significantly in the network and possibly
include a large error.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
This patch adds a configuration option that allows running a boundary clock
using "just a bunch of devices". Normally each port is probed to make sure
they all share the same PTP hardware clock, but this option will allow a
heterogeneous collection of devices, should the user really want it.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Acked-by: Jiri Benc <jbenc@redhat.com>
Instead of setting it to the PTP domain number, add a new option to
ptp4l and phc2sys to set it as needed. The default value is 0. This
allows multiple ptp4l/phc2sys instances running in the same domain.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
This is a simple servo that provides the NTP SHM reference clock. It
doesn't make any clock adjustments and it always returns with the
unlocked state. It writes all samples to the SHM segment and another
process (e.g. chronyd or ntpd) is needed to read the samples and
actually synchronize the clock. The SHM segment number is set to the PTP
domain number to allow multiple SHM reference clocks running at the same
time.
This is mainly useful when other time sources are available on the
system (e.g. NTP, hardware reference clocks, or other PTP domains)
and a fallback to/from PTP is needed.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Most PHC drivers implement stepping (ADJ_SETOFFSET) by reading the
clock, adjusting the value by the offset and writing it back. This is
not perfectly accurate and if the operation is slow (e.g. due to PCIe
latencies), the error can be in microseconds.
Increase the default first step threshold from 100 nanoseconds to 20
microseconds to step only when the initial offset is larger than
the error in the step.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
This servo uses linear regression to estimate current time and
frequency error. The number of points used in the regression is
variable (from 4 to 64 in powers of 2) and is selected by a long-term
statistic of the prediction error.
Future improvements could include tracking of sudden frequency changes
(e.g. due to temperature variations), better stability of the error
statistic when a large offset is corrected, options to set the speed of
the adaptation, minimum and maximum number of points, or an option to
prefer frequency accuracy over time accuracy.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
These settings will be useful for all implemented servos, so move them
to the common servo code to avoid duplication. The configuration options
are renamed, but the they can be still set by their old names.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
When peer delay is < min_neighbor_prop_delay the port is flagged
as non 802.1AS capable. min_neighbor_prop_delay defaults to -20ms.
Signed-off-by: Delio Brignoli <dbrignoli@audioscience.com>
Add new options delay_filter and delay_filter_length to select the
filter and its length. They set both the clock delay filter and the port
peer delay filter. The default is now moving median with 10 samples.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Check the sanity of the synchronized clock by comparing its uncorrected
frequency with the system monotonic clock. When the measured frequency
offset is larger than the value of the sanity_freq_limit option (20% by
default), a warning message will be printed and the servo will be reset.
Setting the option to zero disables the check.
This is useful to detect when the clock is broken or adjusted by another
program.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Instead of using fixed constants, set them by the following formula from
the current sync to allow good performance of the servo even when the
sync interval changes in runtime and to avoid instability.
kp = min(kp_scale * sync^kp_exponent, kp_norm_max / sync)
ki = min(ki_scale * sync^ki_exponent, ki_norm_max / sync)
The scale, exponent and norm_max constants are configurable. The
defaults are chosen so there is no change to the previous default
constants of the servo with one second sync interval. The automatic
adjustment can be disabled by setting the pi_proportional_const and
pi_integral_const options to a non-zero value, but stability of the
servo is always enforced.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
This patch adds support for using the configured_pi_f_offset servo option to ptp4l.
If "pi_f_offset_const 0.0" is specified in the config file, stepping on the first
update is prevented. If any other positive value is specified, stepping on the
first update occurs when the offset is larger than the specified value.
change since v1
- add the new option to default.cfg and gPTP.cfg
Signed-off-by: Ken ICHIKAWA <ichikawa.ken@jp.fujitsu.com>
Options without parameters are now grouped together at the beginning of line
for better legibility.
Signed-off-by: Libor Pechacek <lpechacek@suse.cz>
Cc: Miroslav Lichvar <mlichvar@redhat.com>
The option sets an additional limit to the hardware limit. It's disabled
if set to zero. The default is 900000000 ppb.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
This patch modifies sk_receive in order to use poll() on POLLERR instead of the
tryagain loop as this resolves issues with drivers who do not return timestamps
quickly enough. It also resolves the issue of wasting time repeating every
microsecond. It lets the kernel sleep our application until the data or timeout arrives.
This change also replaces the old tx_timestamp_retries config value with
tx_timestamp_timeout specified in milliseconds (the smallest length of time poll
accepts). This does have the side effect of increasing the minimum delay before
missing a timestamp by up to 1ms, but the poll should return sooner in the
normal case where a packet timestamp was not dropped.
This change vastly improves some devices and cleans the code up by simplifying a
race condition window due to drivers returning tx timestamp on the error queue.
[ RC - removed the unused 'try_again' variable. ]
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Add kernel_leap option for ptp4l and -x option for phc2sys to disable
setting of the STA_INS/STA_DEL bit to slowly correct the one-second
offset by servo.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Richard Cochran
Miroslav Lichvar
Viliam Lejcik
Richard Cochran
Jesuiter, Henry (ALC NetworX GmbH)
Wolfgang Wallner
IOhannes m zmölnig
Delio Brignoli
Ken ICHIKAWA
Libor Pechacek
Jacob Keller