1HWSTAMP_CTL(8)              System Manager's Manual             HWSTAMP_CTL(8)
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NAME

6       hwstamp_ctl - set time stamping policy at the driver level
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SYNOPSIS

10       hwstamp_ctl -i interface [ -r rx-filter ] [ -t tx-type ] [ -v ]
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DESCRIPTION

14       hwstamp_ctl is a program used to set and get the hardware time stamping
15       policy at the network driver level  with  the  SIOCSHWTSTAMP  ioctl(2).
16       The  tx-type  and  rx-filter  values are hints to the driver what it is
17       expected to do. If the requested fine-grained  filtering  for  incoming
18       packets  is not supported, the driver may time stamp more than just the
19       requested types of packets.
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21       If neither tx-type nor rx-filter values are passed to the  program,  it
22       will  use the SIOCGHWTSTAMP ioctl(2) to non-destructively read the cur‐
23       rent hardware time stamping policy.
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25       This program is a debugging tool. The ptp4l(8) program  does  not  need
26       this  program  to  function,  it  will  set the policy automatically as
27       appropriate.
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OPTIONS

31       -i interface
32              Specify the network interface of  which  the  policy  should  be
33              changed.
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35       -r rx-filter
36              Specify  which types of incoming packets should be time stamped,
37              rx-filter is an integer value.
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39       -t tx-type
40              Enable or disable hardware time stamping for  outgoing  packets,
41              tx-type is an integer value.
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43       -h     Display a help message and list of possible values for rx-filter
44              and tx-type.
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46       -v     Prints the software version and exits.
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SEE ALSO

50       ioctl(2), ptp4l(8)
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54linuxptp                           June 2014                    HWSTAMP_CTL(8)
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