NAME

     vr — VIA Technologies Rhine I/II/III Ethernet device driver

SYNOPSIS

     To compile this driver into the kernel, place the following lines in your kernel configuration file:

           device miibus
           device vr

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

           if_vr_load="YES"

DESCRIPTION

     The vr driver provides support for PCI Ethernet adapters and embedded controllers based on the VIA
     Technologies VT3043 Rhine I, VT86C100A Rhine II, and VT6105/VT6105M Rhine III Fast Ethernet controller
     chips.

     The VIA Rhine chips use bus master DMA and have a descriptor layout designed to resemble that of the DEC
     21x4x “tulip” chips.  The register layout is different however and the receive filter in the Rhine chips is
     much simpler and is programmed through registers rather than by downloading a special setup frame through
     the transmit DMA engine.  Transmit and receive DMA buffers must be longword aligned.  The Rhine chips are
     meant to be interfaced with external physical layer devices via an MII bus.  They support both 10 and
     100Mbps speeds in either full or half duplex.

     The vr driver supports the following media types:

     autoselect            Enable autoselection of the media type and options.  The user can manually override
                           the autoselected mode by adding media options to the /etc/rc.conf file.

     10baseT/UTP           Set 10Mbps operation.  The mediaopt option can also be used to select either
                           full-duplex or half-duplex modes.

     100baseTX             Set 100Mbps (Fast Ethernet) operation.  The mediaopt option can also be used to
                           select either full-duplex or half-duplex modes.

     The vr driver supports the following media options:

     full-duplex           Force full duplex operation.

     half-duplex           Force half duplex operation.

     Note that the 100baseTX media type is only available if supported by the adapter.  For more information on
     configuring this device, see ifconfig(8).

HARDWARE

     The vr driver supports VIA Technologies Rhine I, Rhine II, and Rhine III based Fast Ethernet adapters
     including:

     •   AOpen/Acer ALN-320
     •   D-Link DFE520-TX
     •   D-Link DFE530-TX
     •   Hawking Technologies PN102TX
     •   Soekris Engineering net5501

SYSCTL VARIABLES

     The following variables are available as sysctl(8) variables:

     dev.vr.%d.stats
             Display lots of useful MAC counters maintained in the driver.

DIAGNOSTICS

     vr%d: couldn't map memory  A fatal initialization error has occurred.

     vr%d: couldn't map interrupt  A fatal initialization error has occurred.

     vr%d: watchdog timeout  The device has stopped responding to the network, or there is a problem with the
     network connection (cable).

     vr%d: no memory for rx list  The driver failed to allocate an mbuf for the receiver ring.

     vr%d: no memory for tx list  The driver failed to allocate an mbuf for the transmitter ring when allocating
     a pad buffer or collapsing an mbuf chain into a cluster.

     vr%d: chip is in D3 power state -- setting to D0  This message applies only to adapters which support power
     management.  Some operating systems place the controller in low power mode when shutting down, and some PCI
     BIOSes fail to bring the chip out of this state before configuring it.  The controller loses all of its PCI
     configuration in the D3 state, so if the BIOS does not set it back to full power mode in time, it will not
     be able to configure it correctly.  The driver tries to detect this condition and bring the adapter back to
     the D0 (full power) state, but this may not be enough to return the driver to a fully operational
     condition.  If you see this message at boot time and the driver fails to attach the device as a network
     interface, you will have to perform second warm boot to have the device properly configured.

     Note that this condition only occurs when warm booting from another operating system.  If you power down
     your system prior to booting FreeBSD, the card should be configured correctly.

SEE ALSO

     altq(4), arp(4), miibus(4), netintro(4), ng_ether(4), polling(4), ifconfig(8)

     The VIA Technologies VT86C100A data sheet, http://www.via.com.tw.

HISTORY

     The vr device driver first appeared in FreeBSD 3.0.

AUTHORS

     The vr driver was written by Bill Paul <wpaul@ctr.columbia.edu>.

BUGS

     The vr driver always copies transmit mbuf chains into longword-aligned buffers prior to transmission in
     order to pacify the Rhine chips.  If buffers are not aligned correctly, the chip will round the supplied
     buffer address and begin DMAing from the wrong location.  This buffer copying impairs transmit performance
     on slower systems but cannot be avoided.  On faster machines (e.g. a Pentium II), the performance impact is
     much less noticeable.