NFE(4) BSD Kernel Interfaces Manual NFE(4)NAMEnfe — NVIDIA nForce MCP 10/100/Gigabit Ethernet driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your
kernel configuration file:
device miibus
device nfe
Alternatively, to load the driver as a module at boot time, place the
following line in loader.conf(5):
if_nfe_load="YES"
DESCRIPTION
The nfe driver supports PCI Ethernet adapters based on the NVIDIA nForce
Media and Communications Processors (MCP), such as the nForce, nForce 2,
nForce 3, CK804, MCP04, MCP51, MCP55, MCP61, MCP65, MCP67, MCP73, MCP77
and MCP79 Ethernet controller chips.
The nfe driver supports the following media types:
autoselect Enable autoselection of the media type and options.
10baseT Set 10Mbps operation.
100baseTX Set 100Mbps (Fast Ethernet) operation.
1000baseT Set 1000Mbps (Gigabit Ethernet) operation (recent models
only).
MIB Variables and Loader Tunables
The following per-interface variables are implemented in the hw.nfeX
branch of the sysctl(3) MIB. Loader tunables with the same names, but
using the prefix hw.nfe are also implemented, they apply to all nfe
interfaces in system and can be set in loader.conf(5).
imtimer Interrupt moderation time (unit: microseconds). The
default value is -125. A value of 0 means disabled. A
negative value, -Y, means hardware timer simulated inter‐
rupt moderation, the simulated interrupt moderation timer
will be set to Y. A positive valye, Y, means hardware
timer only interrupt moderation, hardware timer will be
set to Y. Value can be tuned when the interface is run‐
ning. Positive values in the range 64-128 seems to be a
reasonable.
rx_ring_count RX ring count. sysctl node is read-only. The default
value is 128. With heavier interrupt moderation (eg.
imtimer=-250), it is recommended to increase rx_ring_count
(eg. to 512).
tx_ring_count TX ring count. sysctl node is read-only. The default
value is 256.
For more information on configuring this device, see ifconfig(8). The
nfe driver supports polling(4).
SEE ALSOarp(4), ifmedia(4), intro(4), miibus(4), netintro(4), pci(4), polling(4),
vlan(4), loader.conf(5), ifconfig(8)HISTORY
The nfe device driver first appeared in OpenBSD 3.9 and was imported into
DragonFly 1.7.
AUTHORS
The nfe driver was written by Jonathan Gray ⟨jsg@openbsd.org⟩ and Damien
Bergamini ⟨damien@openbsd.org⟩. It was ported to DragonFly by Sepherosa
Ziehau ⟨sepherosa@gmail.com⟩.
CAVEATS
NVIDIA refuse to release any documentation on their products.
BSD July 12, 2008 BSD
