Add main code of synce4l - user space application implementing
standard - Recommendation ITU-T G.8264/Y.1364.
On init the application parses SyncE config file and initializes
a synce_clock with SyncE devices and configured ports.
synce_clock is later polled until application termination.
Add documentation in form of Linux manual and 'synce4l_README.md'.
Add synce4l to the linuxptp makefile.
Co-developed-by: Andrzej Sawula <andrzej.saw...@intel.com>
Signed-off-by: Andrzej Sawula <andrzej.saw...@intel.com>
Co-developed-by: Piotr Kwapulinski <piotr.kwapulin...@intel.com>
Signed-off-by: Piotr Kwapulinski <piotr.kwapulin...@intel.com>
Co-developed-by: Michal Michalik <michal.micha...@intel.com>
Signed-off-by: Michal Michalik <michal.micha...@intel.com>
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalew...@intel.com>
---
v2:
- fix duplicated entry in synce4l.8
- updated license headers
v3:
- rebase patch series
- fix typo in 'usage'
- add synce4l to .gitignore
.gitignore | 1 +
README.org | 2 +
makefile | 9 +-
synce4l.8 | 239 ++++++++++++++++++++++++++++++++++++++++++++++
synce4l.c | 132 +++++++++++++++++++++++++
synce4l_README.md | 194 +++++++++++++++++++++++++++++++++++++
6 files changed, 575 insertions(+), 2 deletions(-)
create mode 100644 synce4l.8
create mode 100644 synce4l.c
create mode 100644 synce4l_README.md
diff --git a/.gitignore b/.gitignore
index 1e7d1ca..8c65e47 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,5 +8,6 @@
/ptp4l
/phc_ctl
/snmp4lptp
+/synce4l
/timemaster
/ts2phc
diff --git a/README.org b/README.org
index 063b542..ab0d5a0 100644
--- a/README.org
+++ b/README.org
@@ -51,6 +51,8 @@
- Supports bonded, IPoIB, and vlan interfaces.
+ - Supports Synchronous Ethernet (Recommendation ITU-T G.8264/Y.1364).
+
* Getting the Code
You can download the latest released version at Source Forge.
diff --git a/makefile b/makefile
index 5295b60..b7263a9 100644
--- a/makefile
+++ b/makefile
@@ -22,12 +22,14 @@ CC = $(CROSS_COMPILE)gcc
VER = -DVER=$(version)
CFLAGS = -Wall $(VER) $(incdefs) $(DEBUG) $(EXTRA_CFLAGS)
LDLIBS = -lm -lrt -pthread $(EXTRA_LDFLAGS)
-PRG = ptp4l hwstamp_ctl nsm phc2sys phc_ctl pmc timemaster ts2phc
+PRG = ptp4l hwstamp_ctl nsm phc2sys phc_ctl pmc timemaster ts2phc synce4l
FILTERS = filter.o mave.o mmedian.o
SERVOS = linreg.o ntpshm.o nullf.o pi.o servo.o
TRANSP = raw.o transport.o udp.o udp6.o uds.o
TS2PHC = ts2phc.o lstab.o nmea.o serial.o sock.o ts2phc_generic_pps_source.o \
ts2phc_nmea_pps_source.o ts2phc_phc_pps_source.o ts2phc_pps_sink.o
ts2phc_pps_source.o
+SYNCE = esmc_socket.o synce_clock.o synce_dev.o synce_dev_ctrl.o \
+ synce_msg.o synce_port.o synce_port_ctrl.o synce_transport.o
OBJ = bmc.o clock.o clockadj.o clockcheck.o config.o designated_fsm.o \
e2e_tc.o fault.o $(FILTERS) fsm.o hash.o interface.o monitor.o msg.o phc.o \
port.o port_signaling.o pqueue.o print.o ptp4l.o p2p_tc.o rtnl.o $(SERVOS) \
@@ -35,7 +37,7 @@ OBJ = bmc.o clock.o clockadj.o clockcheck.o config.o
designated_fsm.o \
unicast_fsm.o unicast_service.o util.o version.o
OBJECTS = $(OBJ) hwstamp_ctl.o nsm.o phc2sys.o phc_ctl.o pmc.o
pmc_agent.o \
- pmc_common.o sysoff.o timemaster.o $(TS2PHC)
+ pmc_common.o $(SYNCE) sysoff.o timemaster.o $(TS2PHC)
SRC = $(OBJECTS:.o=.c)
DEPEND = $(OBJECTS:.o=.d)
srcdir := $(dir $(lastword $(MAKEFILE_LIST)))
@@ -50,6 +52,9 @@ man8dir = $(mandir)/man8
all: $(PRG)
+synce4l: config.o hash.o interface.o phc.o print.o sk.o $(SYNCE) util.o \
+ version.o
+
ptp4l: $(OBJ)
nsm: config.o $(FILTERS) hash.o interface.o msg.o nsm.o phc.o print.o \
diff --git a/synce4l.8 b/synce4l.8
new file mode 100644
index 0000000..a266e80
--- /dev/null
+++ b/synce4l.8
@@ -0,0 +1,239 @@
+.\" Manpage for synce4l.
+.\" Contact linuxptp-devel@lists.sourceforge.net to correct errors or typos.
+.TH man 8 "21 Apr 2022" "1.0" "synce4l man page"
+
+.SH NAME
+synce4l \- Synchronous Ethernet (Sync-E) controller application
+
+.SH SYNOPSIS
+synce4l -f [file] [-l <num>] [-m] [-q] [-v] [-h]
+
+.SH DESCRIPTION
+synce4l is an implementation of the Synchronous Ethernet (Sync-E) protocol
+according to ITU-T Rec. G.8264. The design goal is to provide logic to
supported
+hardware by processing Ethernet Synchronization Messaging Channel (ESMC) and
+control Digital Phase Locked Loop (DPLL) clock on Network Card Interface (NIC).
+.P
+Application can operate in two mutually exclusive modes. If both modes are
+configured simultaneously, the external input takes precedence over internal
one
+(internal is disabled implicitly).
+
+.TP
+External input
+If `synce4l` is configured to run in "external input" mode then DPLL needs to
+have external 1PPS source attached (GPS or other generator).
+In this scenario `synce4l` always broadcasts clock quality level (QL) defined
+in configuration file. Additionally, for "external input" mode incoming Sync-E
+frames do not participate in best source selection algorithm for DPLL.
+
+.TP
+Internal input
+In "internal input" mode incoming Sync-E frames are processed and best clock
+source is extracted from the link having the best quality level.
+`synce4l` configures such "best quality" port as a source to recover clock
+for DPLL. The recovered QL is broadcasted to all other interfaces then.
+An external clock cannot be used in this mode.
+
+.SH OPTIONS
+.TP
+.B \-f [file]
+read configuration from 'file' (config file takes precedence over
+command line arguments)
+.TP
+.B \-l [num]
+set the logging level to 'num' (0: least detailed, 7: most detailed)
+.TP
+.B \-m
+print messages to stdout
+.TP
+.B \-q
+do not print messages to the syslog
+.TP
+.B \-v
+print synce4l version and exit
+.TP
+.B \-h
+print this message and exit
+
+.SH CONFIGURATION FILE
+Configuration file contains three sections:
+.IP -
+global,
+.IP -
+device,
+.IP -
+port.
+
+.SS Global section
+This section starts with `[global]` keyword. It sets the logging options.
+.RS
+Available options:
+.IP logging_level
+Minimum log level required to appear in a log.
+.P
+.RS
+Defaults to 6, valid values are 0 - 7
+.RE
+.IP message_tag
+Tag reported in a log.
+.IP use_syslog
+Set to 1 if `syslog` should be used.
+.P
+.RS
+Defaults to 1, valid values are 0 or 1
+.RE
+.IP verbose
+Set to 1 to log extra information.
+.P
+.RS
+Defaults to 0, valid values are 0 or 1
+.RE
+.RE
+
+.SS Device section
+This section specifies the configuration of a device e.g. ptp1.
+It starts with the full path name of a device e.g. [/dev/ptp1].
+DPLL state is retrieved using shell command defined by the user. Expected
values
+for each dpll state are also defined by the user.
+.RS
+Available options:
+.IP internal_input
+Set to 1 to enable "internal input" mode. Mutually exclusive with
+"external_input" parameter.
+.P
+.RS
+Defaults to 1, valid values are 0 or 1
+.RE
+.IP external_input
+Set to 1 to enable "external input" mode. Mutually exclusive with
+"internal_input" parameter. Takes precedence over "internal_input" parameter.
+.P
+.RS
+Defaults to 0, valid values are 0 or 1
+.RE
+.IP external_input_QL
+Quality Level (QL) for "external input" mode.
+.P
+.RS
+Valid values specified in ITU-T Recommendations
+.RE
+.IP external_input_ext_QL
+Extended Quality Level for "external input" mode.
+.P
+.RS
+Valid values specified in ITU-T Recommendations
+.RE
+.IP extended_tlv
+Set to 1 to enable extended QL.
+.P
+.RS
+Defaults to 0, valid values are 0 or 1
+.RE
+.IP network_option
+Network option according to T-REC-G.8264. All devices in Sync-E domain
+should have the same option configured.
+.P
+.RS
+Defaults to 1, valid values are 1 or 2
+.RE
+.IP recover_time
+Seconds indicating the minimum time to recover from the QL-failed state on the
port.
+.P
+.RS
+Defaults to 60, valid values are 10 - 720
+.RE
+.IP get_dpll_state_cmd
+Defines a shell command which will be executed by synce4l to acquire current
+state of a Sync-E DPLL on the device. Separated command must be provided by the
+user for each device confgured for frequency synchronization. The command shall
+output current state of DPLL to stdout, expected values are defined (also by
the
+user) with following configuration items:
+dpll_holdover_value, dpll_locked_ho_value, dpll_locked_value,
+dpll_freerun_value, dpll_invalid_value.
+.RS
+.RE
+.IP dpll_holdover_value
+Defines a string value expected on stdout stream when DPLL is in HOLDOVER
state.
+.P
+.RS
+.RE
+.IP dpll_locked_ho_value
+Defines a string value expected on stdout stream when DPLL is in LOCKED
HOLDOVER
+state.
+.P
+.RS
+.RE
+.IP dpll_locked_value
+Defines a string value expected on stdout stream when DPLL is in LOCKED state.
+.P
+.RS
+.RE
+.IP dpll_freerun_value
+Defines a string value expected on stdout stream when DPLL is in FREERUN state.
+.P
+.RS
+.RE
+.IP dpll_invalid_value
+Defines a string value expected on stdout stream when DPLL is in INVALID state.
+.P
+.RE
+
+.SS Port section
+Any other section not starting with `/` (e.g. [eth0]) is the port section.
+Multiple port sections are allowed. Each port participates in Sync-E
+communication.
+.RS
+Available options:
+.IP sync
+Set to 1 to enable the port for Sync-E communication (i.e. best source
+selection and QLs advertisement).
+.P
+.RS
+Defaults to 0, valid values are 0 or 1
+.RE
+.IP tx_heartbeat_msec
+Interval between consecutive Sync-E frame transmissions (1000ms recommended).
+.P
+.RS
+Defaults to 1000, valid values are 100 - 3000
+.RE
+.IP rx_heartbeat_msec
+Interval between consecutive Sync-E socket polls (frame receive).
+.P
+.RS
+Defaults to 50, valid values are 10 - 500
+.RE
+.IP recover_clock_enable_cmd
+A shell command which enables PHY port pointed by this Port section as a source
+of frequency for the Sync-E DPLL on this device (required only in
+"internal input" mode).
+.RS
+.RE
+.IP recover_clock_disable_cmd
+A shell command which disables PHY port pointed by this Port section as a
source
+of frequency for the Sync-E DPLL on this device (required only in
+"internal input" mode).
+.IP allowed_qls
+List of integers containing allowed SSM QLs separated by comma (`,`), other
+received ones would be discarded. If parameter is not provided, all QLs will be
+accepted.
+.P
+.IP allowed_ext_qls
+List of integers containing allowed extended SSM QLs separated by comma (`,`),
+other received ones would be discarded. If parameter is not provided, all QLs
will
+be accepted.
+.P
+.RE
+
+.SH SEE ALSO
+.BR ptp4l (8)
+
+.SH BUGS
+No known bugs.
+
+.SH AUTHOR
+Arkadiusz Kubalewski <arkadiusz.kubalew...@intel.com>
+.P
+Michal Michalik <michal.micha...@intel.com>
+.P
+Piotr Kwapulinski <piotr.kwapulin...@intel.com>
diff --git a/synce4l.c b/synce4l.c
new file mode 100644
index 0000000..0ce42b4
--- /dev/null
+++ b/synce4l.c
@@ -0,0 +1,132 @@
+/**
+ * @file synce4l.c
+ * @brief Synchronous Ethernet (Sync-E) userspace client
+ * @note SPDX-FileCopyrightText: Copyright 2022 Intel Corporation
+ * @note SPDX-License-Identifier: GPL-2.0+
+ */
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/queue.h>
+#include <errno.h>
+
+#include "synce_clock.h"
+#include "config.h"
+#include "print.h"
+#include "version.h"
+
+static void usage(char *progname)
+{
+ fprintf(stderr,
+ "\nusage: %s [options]\n\n"
+ " \n\n"
+ " options:\n\n"
+ " -f [file] read configuration from 'file'\n"
+ " (config file takes precedence over command line
arguments)\n"
+ " -l [num] set the logging level to 'num'\n"
+ " (%d: least detailed, %d: most detailed)\n"
+ " -m print messages to stdout\n"
+ " -q do not print messages to the syslog\n"
+ " -v print synce4l version and exit\n"
+ " -h print this message and exit\n"
+ "\n",
+ progname, PRINT_LEVEL_MIN, PRINT_LEVEL_MAX);
+}
+
+static void synce4l_cleanup(struct config *cfg)
+{
+ if (cfg)
+ config_destroy(cfg);
+}
+
+int main(int argc, char *argv[])
+{
+ int c, err = -EACCES, index, print_level;
+ char *config = NULL, *progname;
+ struct synce_clock *clock;
+ struct option *opts;
+ struct config *cfg;
+
+ if (handle_term_signals())
+ return -EPERM;
+
+ cfg = config_create_synce();
+ if (!cfg) {
+ return -EINVAL;
+ }
+ opts = config_long_options(cfg);
+
+ /* Process the command line arguments. */
+ progname = strrchr(argv[0], '/');
+ progname = progname ? 1+progname : argv[0];
+ while (EOF != (c = getopt_long(argc, argv, "f:l:mqvh",
+ opts, &index))) {
+ switch (c) {
+ case 'f':
+ config = optarg;
+ break;
+ case 'l':
+ if (get_arg_val_i(c, optarg, &print_level,
+ PRINT_LEVEL_MIN, PRINT_LEVEL_MAX))
+ goto out;
+ config_set_int(cfg, "logging_level", print_level);
+ break;
+ case 'm':
+ config_set_int(cfg, "verbose", 1);
+ break;
+ case 'q':
+ config_set_int(cfg, "use_syslog", 0);
+ break;
+ case 'v':
+ version_show(stdout);
+ synce4l_cleanup(cfg);
+ return 0;
+ case 'h':
+ usage(progname);
+ synce4l_cleanup(cfg);
+ return 0;
+ case '?':
+ usage(progname);
+ goto out;
+ default:
+ usage(progname);
+ goto out;
+ }
+ }
+
+ if (config && (c = config_read(config, cfg))) {
+ synce4l_cleanup(cfg);
+ return c;
+ }
+
+ print_set_progname(progname);
+ print_set_tag(config_get_string(cfg, NULL, "message_tag"));
+ print_set_verbose(config_get_int(cfg, NULL, "verbose"));
+ print_set_syslog(config_get_int(cfg, NULL, "use_syslog"));
+ print_set_level(config_get_int(cfg, NULL, "logging_level"));
+
+ if (STAILQ_EMPTY(&cfg->interfaces)) {
+ fprintf(stderr, "%s", "no interface specified\n");
+ usage(progname);
+ goto out;
+ }
+
+ clock = synce_clock_create(cfg);
+ if (!clock) {
+ fprintf(stderr, "%s", "failed to create a synce clock\n");
+ goto out;
+ }
+
+ while (is_running())
+ if (synce_clock_poll(clock))
+ break;
+
+ synce_clock_destroy(clock);
+
+ err = 0;
+out:
+ synce4l_cleanup(cfg);
+ return err;
+}
diff --git a/synce4l_README.md b/synce4l_README.md
new file mode 100644
index 0000000..a1fb593
--- /dev/null
+++ b/synce4l_README.md
@@ -0,0 +1,194 @@
+# Table of contents
+
+1. Introduction
+2. Compilation
+3. Installation
+4. Usage
+5. Config
+
+---
+## 1\. Introduction
+`synce4l` is a software implementation of Synchronous Ethernet (Sync-E)
according
+to ITU-T Recommendation G.8264. The design goal is to provide logic to
supported
+hardware by processing Ethernet Synchronization Messaging Channel (ESMC) and
+control Digital Phase Locked Loop (DPLL) clock on Network Card Interface (NIC).
+
+Application can operate in two mutually exclusive modes. If both modes are
+configured simultaneously, the "external input" mode takes precedence over
+internal one ("internal input" mode is disabled implicitly).
+
+The best source selection is done according to ITU-T Recommendations G.781 and
+G.8264. Two network options are supported: option 1 and option 2.
+
+Table showing priority of quality levels (QLs) in option 1 networks:
+| Quality Level | Priority* | SSM | Extended SSM** |
+| ------------- | --------- | --- | -------------- |
+| ePRTC | 0 | 0x2 | 0x21 |
+| PRTC | 1 | 0x2 | 0x20 |
+| PRC | 2 | 0x2 | 0xFF |
+| SSU-A | 3 | 0x4 | 0xFF |
+| SSU-B | 4 | 0x8 | 0xFF |
+
+Table showing priority of quality levels (QLs) in option 2 networks:
+| Quality Level | Priority* | SSM | Extended SSM** |
+| ------------- | --------- | --- | -------------- |
+| ePRTC | 0 | 0x1 | 0x21 |
+| PRTC | 1 | 0x1 | 0x20 |
+| PRS | 2 | 0x1 | 0xFF |
+| STU | 3 | 0x0 | 0xFF |
+| ST2 | 4 | 0x7 | 0xFF |
+| TNC | 5 | 0x4 | 0xFF |
+| ST3E | 6 | 0xD | 0xFF |
+| PROV | 7 | 0xE | 0xFF |
+
+> *Remark:* *Lower number means higher priority
+
+> *Remark:* **If extended SSM is not enabled, it's implicitly assumed as `0xFF`
+
+### External input
+If `synce4l` is configured to run in "external" input mode then DPLL needs to
+have external 1PPS source attached (GPS or other generator).
+In this scenario `synce4l` always broadcasts clock quality level (QL) defined
+in configuration file. Additionally, for “external” mode incoming Sync-E
+frames do not participate in best source selection algorithm for DPLL.
+
+### Internal input
+In "internal input" mode incoming Sync-E frames are processed and best clock
+source is extracted from the link having the best quality level.
+`synce4l` configures such "best quality" port as a source to recover clock
+for DPLL. The recovered QL is broadcasted to all other interfaces then.
+An external clock cannot be used in this mode.
+
+---
+## 2\. Compilation
+Makefile rules are included in linuxptp `makefile` and compilation is done
using
+the command:
+```
+make synce4l
+```
+
+---
+## 3\. Installation
+Use `make install` target to install `synce4l` in a system.
+
+---
+## 4\. Usage
+Use `-h` command line argument to print the help page:
+```
+$? ./synce4l -h
+usage: synce4l [options]
+
+ ...
+
+ Other Options
+
+ -f [file] read configuration from 'file'
+ (config file takes precedence over command line arguments)
+ -l [num] set the logging level to 'num'
+ (0: least detailed, 7: most detailed)
+ -m print messages to stdout
+ -q do not print messages to the syslog
+ -v print synce4l version and exit
+ -h print this message and exit
+```
+
+> *Remark:* `synce4l` requires root privileges since it opens raw sockets.
+
+---
+## 5\. Config
+### Configuration file contains three sections:
+- global,
+- device,
+- port.
+
+### Global section
+This section starts with `[global]` keyword. It sets the logging options.
+
+| Parameter | Default | Valid values | Description
|
+| --------------- | ------- | ------------ |
---------------------------------------------- |
+| `logging_level` | `6` | `0-7` | Minimum log level required to
appear in a log. |
+| `message_tag` | None | string | Tag reported in a log.
|
+| `use_syslog` | `1` | `0`, `1` | Set to 1 if `syslog` should be
used. |
+| `verbose` | `0` | `0`, `1` | Set to 1 to log extra
information. |
+
+### Device section
+This section specifies the configuration of a one logical device e.g. 'synce1'.
+The name is defined by the user. The name has no impact for any functionality
+except traces.
+The name must be enclosed in extra angle bracket when defining new device
+section e.g. [<synce1>].
+All ports defined by port sections after the device section will create one
+SyncE device (until next device section).
+
+| Parameter | Default | Valid values | Description
|
+| ----------------------- | ------- | ------------ |
------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
+| `internal_input` | `1` | `0`, `1` | Set to 1 to enable
"internal input" mode. Mutually exclusive with `external_input` parameter.
|
+| `external_input` | `0` | `0`, `1` | Set to 1 to enable
"external input" mode. Mutually exclusive with `internal_input` parameter.
Takes precedence over `internal_input` parameter. |
+| `external_input_QL` | `0` | `0-15` | Quality Level (QL) for
"external input" mode.
|
+| `external_input_ext_QL` | `0` | `0-255` | Extended Quality Level
for "external input" mode.
|
+| `extended_tlv` | `0` | `0`, `1` | Set to 1 to enable
extended QL.
|
+| `network_option` | `1` | `1`, `2` | Network option according
to T-REC-G.8264. All devices in Sync-E domain should have the same option
configured. |
+| `recover_time` | `60` | `10-720` | Seconds indicating the
minimum time to recover from the QL-failed state on the port.
|
+| `get_dpll_state_cmd` | None | string | Shell command which will
be executed by synce4l to acquire current state of a Sync-E DPLL on the device.
The command shall output current state of DPLL to stdout. |
+| `dpll_holdover_value` | None | string | Value expected on stdout
stream when DPLL is in HOLDOVER state, after calling command defined in
get_dpll_state_cmd |
+| `dpll_locked_ho_value` | None | string | Value expected on stdout
stream when DPLL is in LOCKED HOLDOVER state, after calling command defined in
get_dpll_state_cmd |
+| `dpll_locked_value` | None | string | Value expected on stdout
stream when DPLL is in LOCKED state, after calling command defined in
get_dpll_state_cmd |
+| `dpll_freerun_value` | None | string | Value expected on stdout
stream when DPLL is in FREERUN state, after calling command defined in
get_dpll_state_cmd |
+| `dpll_invalid_value` | None | string | Value expected on stdout
stream when DPLL is in INVALID state, after calling command defined in
get_dpll_state_cmd |
+
+### Port section
+Any other section not starting with `<` (e.g. [eth0]) is the port section.
+Multiple port sections are allowed. Each port participates in Sync-E
+communication.
+
+| Parameter | Default | Valid values | Description
|
+| --------------------------- | ------- | ------------ |
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
+| `sync` | `0` | `0`, `1` | Set to 1 to enable
the port for Sync-E communication (i.e. best source selection and QLs
advertisement).
|
+| `tx_heartbeat_msec` | `1000` | `100-3000` | Interval between
consecutive Sync-E frame transmissions (1000ms is recommended).
|
+| `rx_heartbeat_msec` | `50` | `10-500` | Interval between
consecutive Sync-E socket polls (frame receive).
|
+| `recover_clock_enable_cmd` | None | string | Shell command which
enables PHY port pointed by this Port section as a source of frequency for the
Sync-E DPLL on this device (required only in "internal_input" mode). |
+| `recover_clock_disable_cmd` | None | string | Shell command which
disables PHY port pointed by this Port section as a source of frequency for the
Sync-E DPLL on this device (required only in "internal_input" mode). |
+| `allowed_qls` | None | string | List of integers
containing allowed SSM QLs separated by comma (`,`), other received ones would
be discarded - if parameter is not provided, all QLs will be accepted |
+| `allowed_ext_qls` | None | string | List of integers
containing allowed extended SSM QLs separated by comma (`,`), other received
ones would be discarded - if parameter is not provided, all QLs will be
accepted |
+
+> *Remark:* Please do not use backslashes in config file in 'string' fields -
for example do not use it like this:
`"/sys/kernel/debug/ice/0000\:5e\:00\.0/cgu_state"`
+
+### Config example
+
+```
+[global]
+logging_level 7
+use_syslog 0
+verbose 1
+message_tag [synce4l]
+
+[<synce1>]
+internal_input 0
+external_input 1
+network_option 1
+external_input_QL 11
+external_input_ext_QL 33
+extended_tlv 1
+recover_time 20
+dpll_get_state_cmd cat /sys/class/net/eth0/device/cgu_state
+dpll_holdover_value 4
+dpll_locked_ho_value 3
+dpll_locked_value 2
+dpll_freerun_value 1
+dpll_invalid_value 0
+
+[eth0]
+sync 1
+tx_heartbeat_msec 1000
+rx_heartbeat_msec 500
+recover_clock_enable_cmd echo 1 0 > /sys/class/net/eth0/device/phy/synce
+recover_clock_disable_cmd echo 0 0 > /sys/class/net/eth0/device/phy/synce
+allowed_qls 3,4,7
+allowed_ext_qls 20,21
+
+[eth1]
+sync 0
+```
+
+---
+
--
2.26.0
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