Some hardware can't properly timestamp packets with the new PTP
header version 2.1. This patch adds legacy_ptp_ver config option that
allows advertising of the legacy 2.0 protocol.
Additionally, forcing PTP minor version to be nonzero causes
interoperability issues with some legacy grandmasters.
v2: rebase on top, clarify compatibility issues
v3: fix subject line
v4: change argument to ptp_minor_version
Signed-off-by: Maciek Machnikowski <mac...@machnikowski.net>
---
config.c | 1 +
configs/default.cfg | 1 +
ptp4l.8 | 5 +++++
ptp4l.c | 3 +++
4 files changed, 10 insertions(+)
diff --git a/config.c b/config.c
index b104f1b..95458ed 100644
--- a/config.c
+++ b/config.c
@@ -318,6 +318,7 @@ struct config_item config_tab[] = {
GLOB_ITEM_STR("productDescription", ";;"),
PORT_ITEM_STR("ptp_dst_mac", "01:1B:19:00:00:00"),
PORT_ITEM_STR("p2p_dst_mac", "01:80:C2:00:00:0E"),
+ GLOB_ITEM_INT("ptp_minor_version", 1, 0, 1),
GLOB_ITEM_STR("refclock_sock_address", "/var/run/refclock.ptp.sock"),
GLOB_ITEM_STR("revisionData", ";;"),
GLOB_ITEM_INT("sanity_freq_limit", 200000000, 0, INT_MAX),
diff --git a/configs/default.cfg b/configs/default.cfg
index 00429b9..0c7661c 100644
--- a/configs/default.cfg
+++ b/configs/default.cfg
@@ -46,6 +46,7 @@ power_profile.2011.networkTimeInaccuracy -1
power_profile.2017.totalTimeInaccuracy -1
power_profile.grandmasterID 0
power_profile.version none
+ptp_minor_version 1
#
# Run time options
#
diff --git a/ptp4l.8 b/ptp4l.8
index 40c66c2..a23f30b 100644
--- a/ptp4l.8
+++ b/ptp4l.8
@@ -809,6 +809,11 @@ selection algorithm, lower values take precedence. Must be
in the range 0 to
255.
The default is 128.
+.TP
+.B ptp_minor_version
+This option sets the minorVersionPTP in the common PTP message header.
+The default is 1.
+
.TP
.B refclock_sock_address
The address of the UNIX domain socket to be used by the refclock_sock servo.
diff --git a/ptp4l.c b/ptp4l.c
index c61175b..59ce105 100644
--- a/ptp4l.c
+++ b/ptp4l.c
@@ -192,6 +192,9 @@ int main(int argc, char *argv[])
sk_tx_timeout = config_get_int(cfg, NULL, "tx_timestamp_timeout");
sk_hwts_filter_mode = config_get_int(cfg, NULL, "hwts_filter");
+ ptp_hdr_ver = config_get_int(cfg, NULL, "ptp_minor_version");
+ ptp_hdr_ver = (ptp_hdr_ver << 4) | PTP_MAJOR_VERSION;
+
if (config_get_int(cfg, NULL, "clock_servo") == CLOCK_SERVO_NTPSHM) {
config_set_int(cfg, "kernel_leap", 0);
config_set_int(cfg, "sanity_freq_limit", 0);
--
2.30.2
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