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ntp: check timestamping configuration when SIOCSHWTSTAMP fails

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With future kernels it may be possible to get, but not set, the HW
timestamping configuration on some specific interfaces like macvlan in
containers. This would require the admin to configure the timestamping
before starting chronyd.

If SIOCSHWTSTAMP failed on an interface, try SIOCGHWTSTAMP to check if
the current configuration matches the expected configuration and allow
the interface to be used for HW timestamping.
This commit is contained in:
Miroslav Lichvar 2019-05-07 18:04:37 +02:00
parent 08fd011b6a
commit 69d3913f3e
1 changed files with 23 additions and 12 deletions
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35
ntp_io_linux.c
View file

@ -123,7 +123,7 @@ add_interface(CNF_HwTsInterface *conf_iface)
struct ethtool_ts_info ts_info;
struct hwtstamp_config ts_config;
struct ifreq req;
int sock_fd, if_index, phc_fd, req_hwts_flags;
int sock_fd, if_index, phc_fd, req_hwts_flags, rx_filter;
unsigned int i;
struct Interface *iface;
@ -177,40 +177,51 @@ add_interface(CNF_HwTsInterface *conf_iface)
return 0;
}
ts_config.flags = 0;
ts_config.tx_type = HWTSTAMP_TX_ON;
switch (conf_iface->rxfilter) {
case CNF_HWTS_RXFILTER_ANY:
#ifdef HAVE_LINUX_TIMESTAMPING_RXFILTER_NTP
if (ts_info.rx_filters & (1 << HWTSTAMP_FILTER_NTP_ALL))
ts_config.rx_filter = HWTSTAMP_FILTER_NTP_ALL;
rx_filter = HWTSTAMP_FILTER_NTP_ALL;
else
#endif
if (ts_info.rx_filters & (1 << HWTSTAMP_FILTER_ALL))
ts_config.rx_filter = HWTSTAMP_FILTER_ALL;
rx_filter = HWTSTAMP_FILTER_ALL;
else
ts_config.rx_filter = HWTSTAMP_FILTER_NONE;
rx_filter = HWTSTAMP_FILTER_NONE;
break;
case CNF_HWTS_RXFILTER_NONE:
ts_config.rx_filter = HWTSTAMP_FILTER_NONE;
rx_filter = HWTSTAMP_FILTER_NONE;
break;
#ifdef HAVE_LINUX_TIMESTAMPING_RXFILTER_NTP
case CNF_HWTS_RXFILTER_NTP:
ts_config.rx_filter = HWTSTAMP_FILTER_NTP_ALL;
rx_filter = HWTSTAMP_FILTER_NTP_ALL;
break;
#endif
default:
ts_config.rx_filter = HWTSTAMP_FILTER_ALL;
rx_filter = HWTSTAMP_FILTER_ALL;
break;
}
ts_config.flags = 0;
ts_config.tx_type = HWTSTAMP_TX_ON;
ts_config.rx_filter = rx_filter;
req.ifr_data = (char *)&ts_config;
if (ioctl(sock_fd, SIOCSHWTSTAMP, &req)) {
DEBUG_LOG("ioctl(%s) failed : %s", "SIOCSHWTSTAMP", strerror(errno));
close(sock_fd);
return 0;
/* Check the current timestamping configuration in case this interface
allows only reading of the configuration and it was already configured
as requested */
req.ifr_data = (char *)&ts_config;
#ifdef SIOCGHWTSTAMP
if (ioctl(sock_fd, SIOCGHWTSTAMP, &req) ||
ts_config.tx_type != HWTSTAMP_TX_ON || ts_config.rx_filter != rx_filter)
#endif
{
close(sock_fd);
return 0;
}
}
close(sock_fd);