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NFE(4)                DragonFly Kernel Interfaces Manual                NFE(4)


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 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 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.

DragonFly 4.1                  November 28, 2014                 DragonFly 4.1

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