218 lines
6.7 KiB
Groff
218 lines
6.7 KiB
Groff
.\" Copyright (c) 1997, 1998
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.\" Bill Paul <wpaul@ctr.columbia.edu>. 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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Bill Paul.
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.\" 4. Neither the name of the author nor the names of any co-contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul OR THE VOICES IN HIS HEAD
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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.\" THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 25, 2012
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.Dt VR 4
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.Os
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.Sh NAME
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.Nm vr
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.Nd "VIA Technologies Rhine I/II/III Ethernet device driver"
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device miibus"
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.Cd "device vr"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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if_vr_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for PCI Ethernet adapters and embedded
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controllers based on the VIA Technologies VT3043 Rhine I,
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VT86C100A Rhine II, and VT6105/VT6105M Rhine III Fast Ethernet
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controller chips.
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.Pp
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The VIA Rhine chips use bus master DMA and have a descriptor layout
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designed to resemble that of the DEC 21x4x
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.Dq tulip
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chips.
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The register
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layout is different however and the receive filter in the Rhine chips
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is much simpler and is programmed through registers rather than by
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downloading a special setup frame through the transmit DMA engine.
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Transmit and receive DMA buffers must be longword
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aligned.
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The Rhine chips are meant to be interfaced with external
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physical layer devices via an MII bus.
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They support both
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10 and 100Mbps speeds in either full or half duplex.
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.Pp
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The
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.Nm
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driver supports the following media types:
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.Bl -tag -width xxxxxxxxxxxxxxxxxxxx
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.It autoselect
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Enable autoselection of the media type and options.
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The user can manually override
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the autoselected mode by adding media options to the
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.Pa /etc/rc.conf
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file.
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.It 10baseT/UTP
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Set 10Mbps operation.
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The
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.Ar mediaopt
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option can also be used to select either
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.Ar full-duplex
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or
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.Ar half-duplex
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modes.
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.It 100baseTX
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Set 100Mbps (Fast Ethernet) operation.
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The
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.Ar mediaopt
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option can also be used to select either
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.Ar full-duplex
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or
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.Ar half-duplex
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modes.
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.El
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.Pp
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The
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.Nm
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driver supports the following media options:
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.Bl -tag -width xxxxxxxxxxxxxxxxxxxx
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.It full-duplex
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Force full duplex operation
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.It half-duplex
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Force half duplex operation.
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.El
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.Pp
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Note that the 100baseTX media type is only available if supported
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by the adapter.
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For more information on configuring this device, see
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.Xr ifconfig 8 .
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.Sh HARDWARE
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The
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.Nm
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driver supports VIA Technologies Rhine I, Rhine II, and Rhine III based
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Fast Ethernet adapters including:
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.Pp
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.Bl -bullet -compact
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.It
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AOpen/Acer ALN-320
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.It
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D-Link DFE520-TX
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.It
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D-Link DFE530-TX
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.It
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Hawking Technologies PN102TX
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.It
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Soekris Engineering net5501
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.El
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.Sh SYSCTL VARIABLES
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The following variables are available as
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.Xr sysctl 8
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variables:
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.Bl -tag -width indent
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.It Va dev.vr.%d.stats
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Display lots of useful MAC counters maintained in the driver.
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.El
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "vr%d: couldn't map memory"
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A fatal initialization error has occurred.
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.It "vr%d: couldn't map interrupt"
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A fatal initialization error has occurred.
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.It "vr%d: watchdog timeout"
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The device has stopped responding to the network, or there is a problem with
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the network connection (cable).
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.It "vr%d: no memory for rx list"
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The driver failed to allocate an mbuf for the receiver ring.
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.It "vr%d: no memory for tx list"
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The driver failed to allocate an mbuf for the transmitter ring when
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allocating a pad buffer or collapsing an mbuf chain into a cluster.
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.It "vr%d: chip is in D3 power state -- setting to D0"
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This message applies only to adapters which support power
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management.
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Some operating systems place the controller in low power
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mode when shutting down, and some PCI BIOSes fail to bring the chip
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out of this state before configuring it.
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The controller loses all of
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its PCI configuration in the D3 state, so if the BIOS does not set
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it back to full power mode in time, it will not be able to configure it
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correctly.
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The driver tries to detect this condition and bring
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the adapter back to the D0 (full power) state, but this may not be
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enough to return the driver to a fully operational condition.
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If
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you see this message at boot time and the driver fails to attach
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the device as a network interface, you will have to perform second
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warm boot to have the device properly configured.
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.Pp
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Note that this condition only occurs when warm booting from another
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operating system.
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If you power down your system prior to booting
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.Fx ,
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the card should be configured correctly.
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.El
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.Sh SEE ALSO
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.Xr altq 4 ,
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.Xr arp 4 ,
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.Xr miibus 4 ,
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.Xr netintro 4 ,
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.Xr ng_ether 4 ,
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.Xr polling 4 ,
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.Xr ifconfig 8
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.Rs
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.%T The VIA Technologies VT86C100A data sheet
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.%U http://www.via.com.tw
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.Re
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.Sh HISTORY
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The
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.Nm
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device driver first appeared in
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.Fx 3.0 .
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.Sh AUTHORS
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The
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.Nm
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driver was written by
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.An Bill Paul Aq wpaul@ctr.columbia.edu .
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.Sh BUGS
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The
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.Nm
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driver always copies transmit mbuf chains into longword-aligned
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buffers prior to transmission in order to pacify the Rhine chips.
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If buffers are not aligned correctly, the chip will round the
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supplied buffer address and begin DMAing from the wrong location.
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This buffer copying impairs transmit performance on slower systems but cannot
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be avoided.
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On faster machines (e.g.\& a Pentium II), the performance
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impact is much less noticeable.
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