VTE(4) BSD Kernel Interfaces Manual VTE(4)
NAME
vte -- Vortex86 RDC R6040 Fast Ethernet driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device miibus
device vte
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
if_vte_load="YES"
DESCRIPTION
The vte device driver provides support for RDC R6040 Fast Ethernet controller which is commonly found on Vortex86 System On a Chip (SoC).
The RDC R6040 has integrated 10/100 PHY for 10/100Mbps support in full or half-duplex. The controller supports interrupt moderation mecha-
nism, a 64-bit multicast hash filter, VLAN over-size frame and four station addresses. The vte device driver uses three station addresses
out of four as perfect multicast filter.
The vte 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.
100baseTX Set 100Mbps (Fast Ethernet) operation.
The vte 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 vte device driver provides support for the following Ethernet controllers:
o DM&P Vortex86 RDC R6040 Fast Ethernet controller
LOADER TUNABLES
Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5).
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.
SYSCTL VARIABLES
The following variables are available as both sysctl(8) variables and loader(8) tunables:
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.
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.
dev.vte.%d.stats
Show hardware MAC statistics maintained in driver.
SEE ALSO
altq(4), arp(4), miibus(4), netintro(4), ng_ether(4), vlan(4), ifconfig(8)
DM&P Electronics Inc. Vortex86, http://www.dmp.com.tw.
HISTORY
The vte driver was written by Pyun YongHyeon <yongari@FreeBSD.org>. It first appeared in FreeBSD 8.3.
BSD
December 30, 2010 BSD