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ntp: add support for HW timestamping on Linux

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Add a new directive to specify interfaces which should be used for HW
timestamping. Extend the Linux ntp_io initialization to enable HW
timestamping, configure the RX filter using the SIOCSHWTSTAMP ioctl,
open their PHC devices, and track them as hwclock instances. When
messages with HW timestamps are received, use the PTP_SYS_OFFSET ioctl
to make PHC samples for hwclock.
This commit is contained in:
Miroslav Lichvar
2016-10-24 12:44:59 +02:00
parent 4449259d88
commit 14a1059e43
5 changed files with 263 additions and 8 deletions
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29
conf.c
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@@ -57,6 +57,7 @@ static void parse_bindcmdaddress(char *);
static void parse_broadcast(char *);
static void parse_clientloglimit(char *);
static void parse_fallbackdrift(char *);
static void parse_hwtimestamp(char *);
static void parse_include(char *);
static void parse_initstepslew(char *);
static void parse_leapsecmode(char *);
@@ -221,6 +222,9 @@ static char *leapsec_tz = NULL;
/* Name of the user to which will be dropped root privileges. */
static char *user;
/* Array of strings for interfaces with HW timestamping */
static ARR_Instance hwts_interfaces;
typedef struct {
NTP_Source_Type type;
int pool;
@@ -322,6 +326,8 @@ CNF_Initialise(int r)
{
restarted = r;
hwts_interfaces = ARR_CreateInstance(sizeof (char *));
init_sources = ARR_CreateInstance(sizeof (IPAddr));
ntp_sources = ARR_CreateInstance(sizeof (NTP_Source));
refclock_sources = ARR_CreateInstance(sizeof (RefclockParameters));
@@ -346,6 +352,10 @@ CNF_Finalise(void)
{
unsigned int i;
for (i = 0; i < ARR_GetSize(hwts_interfaces); i++)
Free(*(char **)ARR_GetElement(hwts_interfaces, i));
ARR_DestroyInstance(hwts_interfaces);
for (i = 0; i < ARR_GetSize(ntp_sources); i++)
Free(((NTP_Source *)ARR_GetElement(ntp_sources, i))->params.name);
@@ -462,6 +472,8 @@ CNF_ParseLine(const char *filename, int number, char *line)
parse_fallbackdrift(p);
} else if (!strcasecmp(command, "hwclockfile")) {
parse_string(p, &hwclock_file);
} else if (!strcasecmp(command, "hwtimestamp")) {
parse_hwtimestamp(p);
} else if (!strcasecmp(command, "include")) {
parse_include(p);
} else if (!strcasecmp(command, "initstepslew")) {
@@ -1221,6 +1233,15 @@ parse_tempcomp(char *line)
/* ================================================== */
static void
parse_hwtimestamp(char *line)
{
check_number_of_args(line, 1);
*(char **)ARR_GetNewElement(hwts_interfaces) = Strdup(line);
}
/* ================================================== */
static void
parse_include(char *line)
{
@@ -1889,3 +1910,11 @@ CNF_GetInitStepThreshold(void)
{
return init_slew_threshold;
}
/* ================================================== */
ARR_Instance
CNF_GetHwTsInterfaces(void)
{
return hwts_interfaces;
}