155 lines
4.5 KiB
Groff
155 lines
4.5 KiB
Groff
.\" Copyright (C) 1998
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.\" Sony Computer Science Laboratory Inc. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $NetBSD: pvctxctl.8,v 1.7 2005/09/15 01:49:07 wiz Exp $
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.\"
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.Dd December 29, 1997
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.Dt PVCTXCTL 8
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.Os
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.Sh NAME
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.Nm pvctxctl
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.Nd display or control ATM PVC transmitter parameters
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.Sh SYNOPSIS
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.Nm
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.Ar interface
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.Op Oo vpi : Oc Ns Ar vci
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.Nm
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.Ar interface
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.Oo vpi : Oc Ns Ar vci
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.Op Fl n
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.Op Fl b Ar max-bandwidth
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.Op Fl j Oo vpi : Oc Ns Ar vci
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.Op Fl p Ar pcr
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.Sh DESCRIPTION
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.Nm
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displays or controls the shaper parameters of an ATM VC.
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When a shaper value is specified,
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.Nm
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sets a shaper to an ATM VC.
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.Nm
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works for a PVC sub interface
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.Xr pvc 4
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as well as a real ATM interface
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.Xr en 4 .
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.Pp
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For a real ATM interface, the specified VC should be assigned
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beforehand by
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.Xr route 8 .
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.Pp
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For a sub interface,
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.Nm
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assigns the specified VC to the sub interface. If another VC is
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already assigned to the sub interface, the old VC is invalidated.
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.Pp
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Availability of shapers, the number of hardware shaper channels,
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and accuracy of shaping are all device dependent.
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For example, ENI Midway chip has 8 shaper channels but the driver
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reserves one for non-shaping VCs.
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.Pp
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The options are as follows:
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.Bl -tag -width Fl
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.It Ar interface
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The
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.Ar interface
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parameter is a string of the form
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.Dq name unit ,
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for example,
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.Dq en0 .
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.It Oo vpi: Oc Ns Ar vci
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The VC number to which the shaper is assigned.
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When the VPI number is omitted, VPI number 0 is
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assumed.
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For example, to assign a shaper to VPI=0 and
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VCI=201, the following forms can be used:
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"201", "0xc9", "0:201", "0:0xc9".
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.It Fl b Ar max-bandwidth
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The PCR parameter can be specified also in
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.Dq bits per second .
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The rate is the rate of AAL5 frame and
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the PCR is calculated by the following form:
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.Pp
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.Dl PCR = max-bandwidth / 8 / 48
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.Pp
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.Dq K
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and
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.Dq M
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can be used as a short hand of
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.Dq 000
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and
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.Dq 000000
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respectively. For example,
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.Dq 45M
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means
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.Dq 45Mbps
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or PCR value
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.Dq 117187 .
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.It Fl j Oo vpi : Oc Ns Ar vci
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The join parameter is intended for VP shaping.
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The VC shaper channel is shared with the existing VC,
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which means the sum of the cell rates never exceeds
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the maximum PCR among the shared VCs.
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On the other hand, when the shaper channel is not shared,
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the sum of the cell rates could be the sum of the PCRs.
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.Pp
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For example, if two VCs (say 201 and 202) share a
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45Mbps VP, use:
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.Pp
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.Dl # pvctxctl en0 201 -b 45M
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.Dl # pvctxctl en0 202 -b 45M -j 201
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.It Fl n
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This parameter is only for a sub interface.
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Use NULL encapsulation instead of LLC/SNAP.
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.It Fl p Ar pcr
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The PCR (Peak Cell Rate) parameter specifies the peak cell rate in
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"cells per second".
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If PCR value "0" is specified,
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no shaper is assigned, which means cells are sent at
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full-speed of the link.
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If PCR value
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.Dq -1
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is specified, the corresponding VC
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is invalidated.
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.El
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.Sh SEE ALSO
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.Xr en 4 ,
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.Xr ifconfig 8 ,
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.Xr pvcsif 8 ,
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.Xr route 8
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.Sh BUGS
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A real ATM interface and a sub interface require different
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sequences to set a shaper.
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For example, to assign a 45Mbps shaper to VC 201 (0xc9) of en0:
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.Bd -literal -offset indent
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# ifconfig en0 10.0.0.1
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# route add -iface 10.0.0.2 -link en0:3.0.0.c9
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# pvctxctl en0 0xc9 -b 45M
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.Ed
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.Pp
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For a shadow interface,
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.Bd -literal -offset indent
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# pvcsif en0 # creates pvc0
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# ifconfig pvc0 10.0.0.1 10.0.0.2
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# pvctxctl pvc0 201 -b 45M
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.Ed
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