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NAME
vge — VIA Networking Technologies Velocity Gigabit Ethernet adapter driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device miibus
device vge
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
if_vge_load="YES"
DESCRIPTION
The vge driver provides support for various NICs and embedded Ethernet interfaces based on the VIA
Technologies VT6120, VT6122, VT6130 and VT6132 Velocity Family Gigabit Ethernet controller chips.
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 of Velocity family. 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 (not on
VT6130/VT6132) up to 16K in size. The Velocity family controllers have a 16K receive FIFO and 48K transmit
FIFO.
The vge driver takes advantage of the controller's checksum offload and VLAN tagging features, as well as
the jumbo frame (except VT6130/VT6132) 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.
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. Jumbo frames are disabled on the VT6130/VT6132 controllers
because the TX MAC will hang when trying to send a frame that is larger than 4K. The receive and transmit
checksum offload support can be toggled on and off using the ifconfig(8) utility.
The vge 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 rc.conf(5).
10baseT/UTP Set 10Mbps operation. The ifconfig(8) mediaopt option can also be used to select either
full-duplex or half-duplex modes.
100baseTX Set 100Mbps (Fast Ethernet) operation. The ifconfig(8) mediaopt option can also be used to
select either full-duplex or half-duplex modes.
1000baseTX Set 1000baseTX operation over twisted pair. The ifconfig(8) mediaopt option can also be used
to select either full-duplex or half-duplex modes.
The vge driver supports the following media options:
full-duplex Force full duplex operation.
half-duplex Force half duplex operation.
For more information on configuring this device, see ifconfig(8).
HARDWARE
The vge driver supports VIA Networking VT6120, VT6122, VT6130 and VT6132 based Gigabit Ethernet adapters
including:
• VIA Networking LAN-on-motherboard Gigabit Ethernet
• ZyXEL GN650-T 64-bit PCI Gigabit Ethernet NIC (ZX1701)
• ZyXEL GN670-T 32-bit PCI Gigabit Ethernet NIC (ZX1702)
LOADER TUNABLES
Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5). hw.vge.msi_disable This tunable disables MSI support on the Ethernet hardware. The default value is 0.
SYSCTL VARIABLES
The following variables are available as both sysctl(8) variables and loader(8) tunables: 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 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. 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. 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.
DIAGNOSTICS
vge%d: couldn't map memory A fatal initialization error has occurred.
vge%d: couldn't map ports A fatal initialization error has occurred.
vge%d: couldn't map interrupt A fatal initialization error has occurred.
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.
vge%d: watchdog timeout The device has stopped responding to the network, or there is a problem with the
network connection (cable).
SEE ALSO
altq(4), arp(4), miibus(4), netintro(4), ng_ether(4), polling(4), vlan(4), ifconfig(8)
HISTORY
The vge device driver first appeared in FreeBSD 5.3.
AUTHORS
The vge driver was written by Bill Paul <wpaul@windriver.com>.