xref: /freebsd/share/man/man4/vte.4 (revision bb0667afa14c4e70406cf2fb09a0b3ac66e9a0f4)

.\" Copyright (c) 2010 Pyun YongHyeon
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.Dd December 30, 2010
.Dt VTE 4
.Os
.Sh NAME
.Nm vte
.Nd Vortex86 RDC R6040 Fast Ethernet 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 vte"
.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_vte_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
device driver provides support for RDC R6040 Fast Ethernet controller
which is commonly found on Vortex86 System On a Chip (SoC).
.Pp
The RDC R6040 has integrated 10/100 PHY for 10/100Mbps support in full
or half-duplex.
The controller supports interrupt moderation mechanism, a 64-bit multicast
hash filter, VLAN over-size frame and four station addresses.
The
.Nm
device driver uses three station addresses out of four as perfect
perfect multicast filter.
.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.
.It Cm 100baseTX
Set 100Mbps (Fast Ethernet) operation.
.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
For more information on configuring this device, see
.Xr ifconfig 8 .
.Sh HARDWARE
The
.Nm
device driver provides support for the following Ethernet controllers:
.Pp
.Bl -bullet -compact
.It
DM&P Vortex86 RDC R6040 Fast Ethernet controller
.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.vte.tx_deep_copy
The RDC R6040 controller has no auto-padding support for short
frames and the controller's DMA engine does not have capability to
handle multiple buffers for a TX frame such that driver has to
create a single contiguous TX buffer.
This hardware limitation leads to poor TX performance since most of
CPU cycles are wasted on both de-fragmenting mbuf chains and padding.
This tunable enables deep copy operation for TX frames such that
driver will spend less CPU cycles in de-fragmentation with the
cost of extra TX buffer memory.
The default value is 1 to use deep copy.
.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.vte.%d.rx_mod
Maximum number of packets to fire RX completion interrupt.
The accepted range is 0 to 15, the default is 15.
.It Va dev.vte.%d.tx_mod
Maximum number of packets to fire TX completion interrupt.
The accepted range is 0 to 15, the default is 15.
.It Va dev.vte.%d.stats
Show hardware MAC statistics maintained in driver.
.El
.Sh SEE ALSO
.Xr altq 4 ,
.Xr arp 4 ,
.Xr miibus 4 ,
.Xr netintro 4 ,
.Xr ng_ether 4 ,
.Xr vlan 4 ,
.Xr ifconfig 8
.Rs
.%T "DM&P Electronics Inc. Vortex86"
.%U http://www.dmp.com.tw
.Re
.Sh HISTORY
The
.Nm
driver was written by
.An Pyun YongHyeon
.Aq yongari@FreeBSD.org .
It first appeared in
.Fx 8.3 .