hwstamp_ctl8
Set time stamping policy at the driver level
Usage
hwstamp_ctl -i
interface
[-r
rx-filter]
[-t
tx-type]
[-v]
Overview
hwstamp_ctl is a program used to set and get the hardware time stamping policy at the network driver level with the SIOCSHWTSTAMP ioctl(2). The tx-type and rx-filter 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 nor rx-filter 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.
Options
-iinterface-
Specify the network interface of which the policy should be changed.
-rrx-filter-
Specify which types of incoming packets should be time stamped, rx-filter is an integer value.
-ttx-type-
Enable or disable hardware time stamping for outgoing packets, tx-type is an integer value.
-
-h -
Display a help message and list of possible values for rx-filter and tx-type.
-
-v -
Prints the software version and exits.