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sys_linux: disable other external timestamping channels

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Use new ioctls added in Linux 6.7 to disable receiving events from other
channels when enabling external timestamping on a PHC. This should save
some CPU time when other applications or chronyd instances are using
other channels of the same PHC.
This commit is contained in:
Miroslav Lichvar 2024-04-10 12:05:57 +02:00
parent 28e4eec1c4
commit a914140bd4
1 changed files with 8 additions and 0 deletions
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8
sys_linux.c
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@ -990,6 +990,14 @@ SYS_Linux_SetPHCExtTimestamping(int fd, int pin, int channel,
return 0;
}
#if defined(PTP_MASK_CLEAR_ALL) && defined(PTP_MASK_EN_SINGLE)
/* Disable events from other channels on this descriptor */
if (ioctl(fd, PTP_MASK_CLEAR_ALL))
DEBUG_LOG("ioctl(%s) failed : %s", "PTP_MASK_CLEAR_ALL", strerror(errno));
else if (ioctl(fd, PTP_MASK_EN_SINGLE, &channel))
DEBUG_LOG("ioctl(%s) failed : %s", "PTP_MASK_EN_SINGLE", strerror(errno));
#endif
return 1;
}