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+.\" $OpenBSD: vge.4,v 1.23 2021/09/08 20:29:21 jmc Exp $
+.\" $FreeBSD: vge.4,v 1.6 2004/11/24 19:06:43 brueffer Exp $
+.\"
+.\" Copyright (c) 2004
+.\"	Bill Paul <wpaul@windriver.com>. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by Bill Paul.
+.\" 4. Neither the name of the author nor the names of any co-contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"   without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+.\" THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: September 8 2021 $
+.Dt VGE 4
+.Os
+.Sh NAME
+.Nm vge
+.Nd VIA Velocity 10/100/1Gb Ethernet device
+.Sh SYNOPSIS
+.Cd "vge* at pci?"
+.Cd "ciphy* at mii?"
+.Cd "ipgphy* at mii?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for various NICs and embedded Ethernet interfaces
+based on the VIA Networking Technologies VT6120, VT6122, VT6130 and VT6132
+Gigabit Ethernet controller chips, including the following:
+.Pp
+.Bl -bullet -compact
+.It
+ZyXEL GN650-T 64-bit PCI Gigabit Ethernet NIC (ZX1701)
+.It
+ZyXEL GN670-T 32-bit PCI Gigabit Ethernet NIC (ZX1702)
+.El
+.Pp
+The VT6120/VT6122 is a 33/66MHz 64-bit PCI device which combines a tri-speed
+MAC with an integrated 10/100/1000 copper PHY.
+(Some older cards use an external PHY.)
+The VT6130/VT6132 is the PCI Express version.
+The MAC supports IPv4 transmit/receive IP/TCP/UDP checksum offload,
+VLAN tag insertion and stripping, a 64-entry CAM filter and a 64-entry
+VLAN filter, 64-bit multicast hash filter, 4 separate transmit DMA
+queues, flow control and jumbo frames (not on VT6130/VT6132).
+The Velocity family has a 16K receive FIFO and 48K transmit FIFO.
+.Pp
+The
+.Nm
+driver takes advantage of the IPv4 transmit/receive IP/TCP/UDP checksum
+offload, VLAN tag insertion and stripping, and the CAM filter support.
+The CAM filter is used for multicast address filtering to provide
+64 perfect multicast address filter support.
+If it is necessary for the interface to join more than 64 multicast
+groups, the driver will switch over to using the hash filter.
+.Pp
+The
+.Nm
+driver supports the following media types:
+.Bl -tag -width 10baseTXUTP
+.It Cm autoselect
+Enable autoselection of the media type and options.
+The user can manually override the autoselected mode by adding media
+options to the appropriate
+.Xr hostname.if 5
+file.
+.It Cm 10baseT/UTP
+Set 10Mbps operation.
+The
+.Xr ifconfig 8
+.Ic mediaopt
+option can also be used to select either
+.Cm full-duplex
+or
+.Cm half-duplex
+modes.
+.It Cm 100baseTX
+Set 100Mbps (Fast Ethernet) operation.
+The
+.Xr ifconfig 8
+.Ic mediaopt
+option can also be used to select either
+.Cm full-duplex
+or
+.Cm half-duplex
+modes.
+.It Cm 1000baseT
+Set 1000baseT operation over twisted pair.
+Both
+.Cm full-duplex
+and
+.Cm half-duplex
+modes are supported.
+.El
+.Pp
+The
+.Nm
+driver supports the following media options:
+.Bl -tag -width full-duplex
+.It Cm full-duplex
+Force full duplex operation.
+.It Cm half-duplex
+Force half duplex operation.
+.El
+.Pp
+For more information on configuring this device, see
+.Xr ifconfig 8 .
+.Sh SEE ALSO
+.Xr arp 4 ,
+.Xr ciphy 4 ,
+.Xr ifmedia 4 ,
+.Xr intro 4 ,
+.Xr ipgphy 4 ,
+.Xr netintro 4 ,
+.Xr pci 4 ,
+.Xr hostname.if 5 ,
+.Xr ifconfig 8
+.Sh HISTORY
+The
+.Nm
+device driver first appeared in
+.Ox 3.7 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Bill Paul Aq Mt wpaul@windriver.com
+and ported to
+.Ox
+by
+.An Peter Valchev Aq Mt pvalchev@openbsd.org .