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     nfe — NVIDIA nForce MCP Ethernet driver


     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



     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.

     Supported features include (hardware support provided):

        Receive/Transmit IP/TCP/UDP checksum offload
        Hardware VLAN tag insertion/stripping
        TCP segmentation offload (TSO)
        Jumbo Frames

     Support for Jumbo Frames is provided via the interface MTU setting.  Selecting an MTU larger
     than 1500 bytes with the ifconfig(8) utility configures the adapter to receive and transmit
     Jumbo Frames.

     The nfe driver supports the following media types:

     autoselect   Enable autoselection of the media type and options.

     10baseT/UTP  Set 10Mbps operation.

     100baseTX    Set 100Mbps (Fast Ethernet) operation.

     1000baseT    Set 1000Mbps (Gigabit Ethernet) operation (recent models only).

     The nfe driver supports the following media options:

     half-duplex  Force half duplex operation.

     full-duplex  Force full duplex operation.

     For more information on configuring this device, see ifconfig(8).


     The nfe driver supports the following NVIDIA MCP onboard adapters:

        NVIDIA nForce MCP Networking Adapter
        NVIDIA nForce MCP04 Networking Adapter
        NVIDIA nForce 430 MCP12 Networking Adapter
        NVIDIA nForce 430 MCP13 Networking Adapter
        NVIDIA nForce MCP51 Networking Adapter
        NVIDIA nForce MCP55 Networking Adapter
        NVIDIA nForce MCP61 Networking Adapter
        NVIDIA nForce MCP65 Networking Adapter
        NVIDIA nForce MCP67 Networking Adapter
        NVIDIA nForce MCP73 Networking Adapter
        NVIDIA nForce MCP77 Networking Adapter
        NVIDIA nForce MCP79 Networking Adapter
        NVIDIA nForce2 MCP2 Networking Adapter
        NVIDIA nForce2 400 MCP4 Networking Adapter
        NVIDIA nForce2 400 MCP5 Networking Adapter
        NVIDIA nForce3 MCP3 Networking Adapter
        NVIDIA nForce3 250 MCP6 Networking Adapter
        NVIDIA nForce3 MCP7 Networking Adapter
        NVIDIA nForce4 CK804 MCP8 Networking Adapter
        NVIDIA nForce4 CK804 MCP9 Networking Adapter


     Tunables can be set at the loader(8) prompt before booting the kernel or stored in

             Whether or not MSI support is enabled in the driver.  The default value is 0.

             Whether or not MSI-X support is enabled in the driver.  The default value is 0.


     The following sysctl(8) variables can be used to modify or monitor nfe behavior.

             Maximum number of Rx events to be processed in the event loop before rescheduling a
             taskqueue.  The accepted range is 50 to 255, the default value is 192.  The
             interface does not need to be brought down and up again before a change takes


     altq(4), arp(4), intro(4), miibus(4), netintro(4), pci(4), polling(4), rgephy(4),
     ifconfig(8), sysctl(8)


     The nfe device driver first appeared in OpenBSD 3.9, and then in FreeBSD 7.0.


     The nfe driver was written by Jonathan Gray <> and Damien Bergamini
     <>.  The nfe driver was ported to FreeBSD by Shigeaki Tagashira