hwstamp_ctl - set time stamping policy at the driver level
hwstamp_ctl -i interface
[ -r rx-filter
] [ -v
is a program used to set and get the hardware time stamping
policy at the network driver level with the SIOCSHWTSTAMP
(2). The tx-type
values are hints to
the driver what it is expected to do. If the requested fine-grained filtering
for incoming packets is not supported, the driver may time stamp more than
just the requested types of packets.
If neither tx-type
values are passed to the program,
it will use the SIOCGHWTSTAMP ioctl(2)
to non-destructively read
the current hardware time stamping policy.
This program is a debugging tool. The ptp4l
(8) program does not need this
program to function, it will set the policy automatically as appropriate.
- -i interface
- Specify the network interface of which the policy should be
- -r rx-filter
- Specify which types of incoming packets should be time
stamped, rx-filter is an integer value.
- -t tx-type
- Enable or disable hardware time stamping for outgoing
packets, tx-type is an integer value.
- Display a help message and list of possible values for
rx-filter and tx-type.
- Prints the software version and exits.