Although it does not need to, the UDS port tries to allocate a filter,
just as any normal port would. Since the given length is zero, the
filter tries to allocate storage of size zero. When running with
uClibc, calloc(1, 0) returns NULL, but glibc is apparently returning
"a unique pointer value that can later be successfully passed to
free()." Both behaviors are allowed (see MALLOC(3)).
This patch works around the issue by letting the UDS port have a
filter of length one.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
This patch lets the clock release allocated memory when shutting down. The
main benefit is just to exhibit good form and to make valgrind happier.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
According to 802.1AS, ports are always expected to transmit announce
messages, even if they never want to become the grand master. Instead
of using a slave only BMC state machine as in 1588, 802.1AS offers a
"grand master capable" flag which allows clocks to not send sync
messages.
This patch keeps a port from transmitting sync (but not announce)
messages when there is no other master.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
[ RC: the point is that a port may not be considered capable until
enough messages to compute the ratio have been received. ]
Signed-off-by: Delio Brignoli <dbrignoli@audioscience.com>
Reviewed-by: Richard Cochran <richardcochran@gmail.com>
Sync rx timeout should be set only after receiving the first sync, see
section 10.2.7, figure 10-4 PortSyncSyncReceive state machine in 802.1AS
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>
Median filter has an advantage over moving average that it is much less
sensitive to outliers.
For instance, it allows much faster recovery from an external clock
time step which happened between receiving sync message and sending
delay_req message. The measured delay includes a large error, but the
median is still a good estimate of the delay and the first step
correction applied by the servo is right.
In this implementation the median update has linear time complexity.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Similarly to the servo interface, allow multiple filters to be
used for delay filtering. Convert mave to the new interface.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
This patch cleans up the error message for the Tx timestamp polling, and adds a
line which indicates where the bug might have originated. This should help a
user more easily diagnose what went wrong.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Include also nanoseconds from the current time in the srandom() call.
This should significantly decrease the chance of two machines using the
same random sequence.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
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>
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>
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>
When a new master is selected, drop the old sync time stamp to prevent
calculating invalid delay in case delay_resp will be received before
first sync from the new master.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
When a new master appears, it will start to respond to our delay_req
messages. Make sure we process only responses from our current master
before switching to the new master.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
This patch increases the maximum length of an interface name to
accommodate a UNIX domain socket address of 108 bytes. (This value is
hard coded in the glibc headers, and so we cannot use the Linux kernel
header macro, UNIX_PATH_MAX.)
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
This patch changes the macro for the server socket address into a global
variable so that a subsequent patch can provide a way to set the variable.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
This patch introduces a shell script to figure out the proper definitions
for the HAVE_CLOCK_ADJTIME and HAVE_ONESTEP_SYNC macros, as well as the
include path. The intent is to "do the right thing" for three different
user scenarios, namely cross compiling, compiling against a custom kernel,
and using a plain old disto kernel.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
When the socket couldn't be opened (e.g. in clknetsim), the file
descriptor is invalid and shouldn't be used for sending.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
When ptp4l was configured to use the auto delay mechanism and the first
pdelay request was not received in the slave or uncalibrated state, it
would not make any pdelay requests itself, because there was no delay
timer running.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
This patch adds a semicolon forgotten in commit
5bf265e "missing: add onestep sync to missing.h"
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Following command produces unexpected update rate.
# phc2sys -s eth0 -q -m -O0 -R1.0842021724855044e-19
This is caused by wrong validation of phc_interval related to
significant digits of double precision and phc_interval_tp.tv_sec
overflow.
To avoid these unwanted trouble, this patch limits lower bound of
phc_rate to 1e-9.
There is no profound meaning in the lower bound value. I just think
it's enough to actual use and it doesn't cause phc_interval_tp.tv_sec
overflow in not only 64bit environment but also 32bit environment.
Thereby, messy validation of phc_interval is no longer needed.
Signed-off-by: Ken ICHIKAWA <ichikawa.ken@jp.fujitsu.com>
this patch uses grep to test whether the net_tstamp.h header has
HWTSTAMP_TX_ONESTEP_SYNC flag defined. If it doesn't then we can simply define
it with the correct value. This works because proper drivers should just report
that the value is not allowed if they don't support onestep mode. This is the
cleanest way to ensure that linuxptp will still work on kernels which have not
defined the one step flag, and also works for any distributions which backport
the feature.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Because of packet reordering that can occur in the network, in the
hardware, or in the networking stack, a follow up message can appear
to arrive in the application before the matching sync message. As this
is a normal occurrence, and the sequenceID message field ensures
proper matching, the ptp4l program accepts out of order packets.
This patch adds an additional check using the software time stamps
from the networking stack to verify that the sync message did arrive
first. This check is only useful if the sequence IDs generated by
the master might possibly be incorrect.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
This patch lets a port send the first announce message one millisecond
after the port state transition, rather than waiting one announce interval.
This change is needed because it is desirable to reconfigure the time
network without delay, especially in P2P mode.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
This patch adds a new timer for use in 802.1AS-2011 applications. When
running as a slave in gPTP mode, the program must monitor both announce
and sync messages from the master. If either one goes missing, then we
trigger a BMC election. The sync timeout is actually reset by a valid
sync/follow up pair of messages.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
This patch renames the per-port timer in order to make room in the
namespace for a timer that detects a sync message input timeout.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
The closing and reopening of the transport when in slave only mode is not
necessary if the port is using the peer delay mechanism. In that case, the
port will discover the network error by transmitting a peer delay request.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Acked-by: Delio Brignoli <dbrignoli@audioscience.com>
Add 1 to port numbers printed in the log messages to make them
consistent with messages from port.c. The port number 0 is the UDS port,
which is last in the clock->port array.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Ken Ichikawa has identified a situation in which a sync message can be
wrongly associated with a follow up after the sequence counter wraps
around.
Port is LISTENING
Sync (seqId 0) : ignored
Fup (seqId 0) : ignored
Sync (seqId 1) : ignored
Port becomes UNCALIBRATED here
Fup (seqId 1) : cached!
Sync (seqId 2) : cached
Fup (seqId 2) : match
Sync (seqId 3) : cached
Fup (seqId 3) : match
...
Sync (seqId 65535) : cached
Fup (seqId 65535) : match
Sync (seqId 0) : cached
Fup (seqId 0) : match
Sync (seqId 1) : match with old Fup!!
Fup (seqId 1) : cached!
Sync (seqId 2) : cached
Fup (seqId 2) : match
Actually, I experienced 65500 secs offset every about 65500 secs.
I'm thinking this is the cause.
This patch fixes the issue by changing the port code to remember one
sync or one follow up, never both. The previous ad hoc logic has been
replaced with a small state machine that handles the messages in the
proper order.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Reported-by: Ken ICHIKAWA <ichikawa.ken@jp.fujitsu.com>
Miroslav Lichvar
Richard Cochran
Delio Brignoli
Jacob Keller
Ken ICHIKAWA
Andy Lutomirski