path: root/share/man/man4/vge.4

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.Dd December 17, 2009
.Dt VGE 4
.Os
.Sh NAME
.Nm vge
.Nd "VIA Networking Technologies VT6122 PCI Gigabit Ethernet adapter driver"
.Sh SYNOPSIS
To compile this driver into the kernel,
place the following lines in your
kernel configuration file:
.Bd -ragged -offset indent
.Cd "device miibus"
.Cd "device vge"
.Ed
.Pp
Alternatively, to load the driver as a
module at boot time, place the following line in
.Xr loader.conf 5 :
.Bd -literal -offset indent
if_vge_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
driver provides support for various NICs and embedded Ethernet interfaces
based on the VIA Networking Technologies VT6122 Gigabit Ethernet
controller chips.
.Pp
The 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 MAC supports TCP/IP hardware
checksums (IPv4 only), TCP large send, VLAN tag insertion and stripping,
as well as VLAN filtering, 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 up to 16K in size.
The VT6122 has a 16K receive FIFO and 48K transmit FIFO.
.Pp
The
.Nm
driver takes advantage of the VT6122's checksum offload and VLAN
tagging features, as well as the jumbo frame and 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 jumbo frame support can be enabled by setting the interface MTU
to any value larger than the default of 1500 bytes, up to a maximum
of 9000 bytes.
The receive and transmit checksum offload support
can be toggled on and off using the
.Xr ifconfig 8
utility.
.Pp
The
.Nm
driver supports the following media types:
.Bl -tag -width ".Cm 10baseT/UTP"
.It Cm autoselect
Enable autoselection of the media type and options.
The user can manually override
the autoselected mode by adding media options to
.Xr rc.conf 5 .
.It Cm 10baseT/UTP
Set 10Mbps operation.
The
.Xr ifconfig 8
.Cm 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
.Cm mediaopt
option can also be used to select either
.Cm full-duplex
or
.Cm half-duplex
modes.
.It Cm 1000baseTX
Set 1000baseTX operation over twisted pair.
The
.Xr ifconfig 8
.Cm mediaopt
option can also be used to select either
.Cm full-duplex
or
.Cm half-duplex
modes.
.El
.Pp
The
.Nm
driver supports the following media options:
.Bl -tag -width ".Cm full-duplex"
.It Cm full-duplex
Force full duplex operation.
.It Cm half-duplex
Force half duplex operation.
.El
.Pp
The
.Nm
driver also supports one special link option for 1000baseTX cards:
.Bl -tag -width ".Cm link0"
.It Cm link0
With 1000baseTX cards, establishing a link between two ports requires
that one port be configured as a master and the other a slave.
With autonegotiation,
the master/slave settings will be chosen automatically.
However when manually selecting the link state, it is necessary to
force one side of the link to be a master and the other a slave.
The
.Nm
driver configures the ports as slaves by default.
Setting the
.Cm link0
flag with
.Xr ifconfig 8
will set a port as a master instead.
.El
.Pp
For more information on configuring this device, see
.Xr ifconfig 8 .
.Sh HARDWARE
The
.Nm
driver supports VIA Networking VT3119 and VT6122 based
Gigabit Ethernet adapters including:
.Pp
.Bl -bullet -compact
.It
VIA Networking LAN-on-motherboard Gigabit Ethernet
.It
ZyXEL GN650-T 64-bit PCI Gigabit Ethernet NIC (ZX1701)
.It
ZyXEL GN670-T 32-bit PCI Gigabit Ethernet NIC (ZX1702)
.El
.Sh LOADER TUNABLES
Tunables can be set at the
.Xr loader 8
prompt before booting the kernel or stored in
.Xr loader.conf 5 .
.Bl -tag -width "xxxxxx"
.It Va hw.vge.msi_disable
This tunable disables MSI support on the Ethernet hardware.
The default value is 0.
.El
.Sh SYSCTL VARIABLES
The following variables are available as both
.Xr sysctl 8
variables and
.Xr loader 8
tunables:
.Bl -tag -width "xxxxxx"
.It Va dev.vge.%d.int_holdoff
Maximum number of time to delay interrupts.
The valid range is 0 to 5100 in units of 1us, the default is
150 (150us).
The resolution of of timer is about 20us so finer tuning than
20us wouldn't be available.
The interface should be brought down and up again before a change
takes effect.
.It Va dev.vge.%d.rx_coal_pkt
Maximum number of packets to fire Rx completion interrupt.
The valid range is 1 to 255, the default is 64.
.It Va dev.vge.%d.tx_coal_pkt
Maximum number of packets to fire Tx completion interrupt.
The valid range is 1 to 255, the default is 128.
.El
.Sh DIAGNOSTICS
.Bl -diag
.It "vge%d: couldn't map memory"
A fatal initialization error has occurred.
.It "vge%d: couldn't map ports"
A fatal initialization error has occurred.
.It "vge%d: couldn't map interrupt"
A fatal initialization error has occurred.
.It "vge%d: failed to enable memory mapping!"
The driver failed to initialize PCI shared memory mapping.
This might
happen if the card is not in a bus-master slot.
.It "vge%d: watchdog timeout"
The device has stopped responding to the network, or there is a problem with
the network connection (cable).
.El
.Sh SEE ALSO
.Xr altq 4 ,
.Xr arp 4 ,
.Xr miibus 4 ,
.Xr netintro 4 ,
.Xr ng_ether 4 ,
.Xr polling 4 ,
.Xr vlan 4 ,
.Xr ifconfig 8
.Sh HISTORY
The
.Nm
device driver first appeared in
.Fx 5.3 .
.Sh AUTHORS
The
.Nm
driver was written by
.An Bill Paul Aq wpaul@windriver.com .