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HWSTAMP_CTL(8)							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 packets  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)

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