HWSTAMP_CTL(8) System Manager's Manual HWSTAMP_CTL(8)
NAME
hwstamp_ctl - set time stamping policy at the driver level
SYNOPSIS
hwstamp_ctl -i interface [ -r rx-filter ] [ -t tx-type ] [ -v ]
DESCRIPTION
hwstamp_ctl is a program used to set 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 pack-
ets is not supported, the driver may time stamp more than just the requested types of packets.
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
-i interface
Specify the network interface of which the policy should be changed.
-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.
-h Display a help message and list of possible values for rx-filter and tx-type.
-v Prints the software version and exits.
SEE ALSO
ioctl(2), ptp4l(8)
linuxptp November 2012 HWSTAMP_CTL(8)
