faraphel/chrony
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conf: add nocrossts option to hwtimestamp directive

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This option disables the use of the PTP_SYS_OFFSET_PRECISE ioctl.
This commit is contained in:
Miroslav Lichvar 2017-01-19 16:23:35 +01:00
parent 31b6a14444
commit 50f99ec5f4
4 changed files with 12 additions and 2 deletions
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4
conf.c
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@ -1260,6 +1260,7 @@ parse_hwtimestamp(char *line)
iface = ARR_GetNewElement(hwts_interfaces);
iface->name = Strdup(p);
iface->minpoll = 0;
iface->nocrossts = 0;
iface->precision = 100.0e-9;
iface->tx_comp = 0.0;
iface->rx_comp = 0.0;
@ -1279,6 +1280,9 @@ parse_hwtimestamp(char *line)
} else if (!strcasecmp(p, "txcomp")) {
if (sscanf(line, "%lf%n", &iface->tx_comp, &n) != 1)
break;
} else if (!strcasecmp(p, "nocrossts")) {
n = 0;
iface->nocrossts = 1;
} else {
break;
}

1
conf.h
View file

@ -122,6 +122,7 @@ extern double CNF_GetInitStepThreshold(void);
typedef struct {
char *name;
int minpoll;
int nocrossts;
double precision;
double tx_comp;
double rx_comp;

3
doc/chrony.conf.adoc
View file

@ -1836,6 +1836,9 @@ This option specifies the difference in seconds between the reported receive
timestamp and the actual reception time at the physical layer. This value will
be subtracted from receive timestamps obtained from the NIC. The default value
is 0.
*nocrossts*:::
Some hardware can precisely cross timestamp the NIC clock with the system
clock. This option disables the use of the cross timestamping.
::
+
Examples of the directive are:

6
ntp_io_linux.c
View file

@ -62,6 +62,7 @@ struct Interface {
int if_index;
int phc_fd;
int phc_mode;
int phc_nocrossts;
/* Link speed in mbit/s */
int link_speed;
/* Start of UDP data at layer 2 for IPv4 and IPv6 */
@ -165,6 +166,7 @@ add_interface(CNF_HwTsInterface *conf_iface)
iface->if_index = if_index;
iface->phc_fd = phc_fd;
iface->phc_mode = 0;
iface->phc_nocrossts = conf_iface->nocrossts;
/* Start with 1 gbit and no VLANs or IPv4/IPv6 options */
iface->link_speed = 1000;
@ -368,8 +370,8 @@ process_hw_timestamp(struct Interface *iface, struct timespec *hw_ts,
int l2_length;
if (HCL_NeedsNewSample(iface->clock, &local_ts->ts)) {
if (!SYS_Linux_GetPHCSample(iface->phc_fd, 0, iface->precision, &iface->phc_mode,
&sample_phc_ts, &sample_sys_ts, &err))
if (!SYS_Linux_GetPHCSample(iface->phc_fd, iface->phc_nocrossts, iface->precision,
&iface->phc_mode, &sample_phc_ts, &sample_sys_ts, &err))
return;
LCL_CookTime(&sample_sys_ts, &sample_local_ts, NULL);