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VGE(4)			    Kernel Interfaces Manual			VGE(4)

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 con-
       trol 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 mul-
       ticast 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 tog-
       gled 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 ei-
		    ther 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:

       o   VIA Networking LAN-on-motherboard Gigabit Ethernet
       o   ZyXEL GN650-T 64-bit	PCI Gigabit Ethernet NIC (ZX1701)
       o   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  oc-
       curred.

       vge%d:  failed to enable	memory mapping!	 The driver failed to initial-
       ize 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  net-
       work, 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>.

FreeBSD	13.2			 May 29, 2011				VGE(4)

NAME | SYNOPSIS | DESCRIPTION | HARDWARE | LOADER TUNABLES | SYSCTL VARIABLES | DIAGNOSTICS | SEE ALSO | HISTORY | AUTHORS

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