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posix_clock_open: derive PHC index from device name if possible 

Currently the PHC index is retrieved only through an ethtool ioctl if
the PHC is specified as an Ethernet interface. If it's a char device
such as /dev/ptp5, the phc_index will remain unpopulated. Try to infer
it from the char device's path.

This is useful when trying to determine whether multiple clocks are in
fact the same (such as /dev/ptp3 and sw1p3), just compare their PHC
index.

Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
master
Vladimir Oltean 2020-08-18 02:19:29 +03:00 committed by Richard Cochran
parent cef87c6f03
commit 380d023abb
1 changed files with 10 additions and 0 deletions
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10
util.c
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@ -211,6 +211,16 @@ clockid_t posix_clock_open(const char *device, int *phc_index)
/* check if device is valid phc device */ /* check if device is valid phc device */
clkid = phc_open(device); clkid = phc_open(device);
if (clkid != CLOCK_INVALID) { if (clkid != CLOCK_INVALID) {
if (!strncmp(device, "/dev/ptp", strlen("/dev/ptp"))) {
int r = get_ranged_int(device + strlen("/dev/ptp"),
phc_index, 0, 65535);
if (r) {
fprintf(stderr,
"failed to parse PHC index from %s\n",
device);
return -1;
}
}
return clkid; return clkid;
} }
/* check if device is a valid ethernet device */ /* check if device is a valid ethernet device */