NAME
nfe —
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 nfeAlternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
if_nfe_load="YES"
DESCRIPTION
Thenfe 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
dev.nfe.X
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 interrupt 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 running. 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 ALSO
arp(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.