71 lines
1.5 KiB
Groff
71 lines
1.5 KiB
Groff
.TH HWSTAMP_CTL 8 "November 2012" "linuxptp"
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.SH NAME
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hwstamp_ctl \- set time stamping policy at the driver level
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.SH SYNOPSIS
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.B hwstamp_ctl
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.BI \-i " interface"
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[
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.BI \-r " rx-filter"
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] [
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.BI \-t " tx-type"
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] [
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.B \-v
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]
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.SH DESCRIPTION
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.B hwstamp_ctl
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is a program used to set and get the hardware time stamping policy at the network
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driver level with the
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.B SIOCSHWTSTAMP
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.BR ioctl (2).
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The
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.I tx-type
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and
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.I rx-filter
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values are hints to the driver what it is expected to do. If the requested
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fine-grained filtering for incoming packets is not supported, the driver may
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time stamp more than just the requested types of packets.
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If neither
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.I tx-type
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nor
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.I rx-filter
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values are passed to the program, it will use the
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.B SIOCGHWTSTAMP
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.BR ioctl(2)
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to non-destructively read the current hardware time stamping policy.
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This program is a debugging tool. The
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.BR ptp4l (8)
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program does not need this program to function, it will set the policy
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automatically as appropriate.
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.SH OPTIONS
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.TP
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.BI \-i " interface"
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Specify the network interface of which the policy should be changed.
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.TP
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.BI \-r " rx-filter"
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Specify which types of incoming packets should be time stamped,
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.I rx-filter
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is an integer value.
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.TP
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.BI \-t " tx-type"
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Enable or disable hardware time stamping for outgoing packets,
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.I tx-type
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is an integer value.
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.TP
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.BI \-h
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Display a help message and list of possible values for
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.I rx-filter
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and
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.IR tx-type .
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.TP
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.B \-v
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Prints the software version and exits.
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.SH SEE ALSO
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.BR ioctl (2),
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.BR ptp4l (8)
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