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     fxp — Intel EtherExpress PRO/100 Ethernet device driver


     To compile this driver into the kernel, place the following lines in your kernel
     configuration file:

           device miibus
           device fxp

     Alternatively, to load the driver as a module at boot time, place the following line in



     The fxp driver provides support for Ethernet adapters based on the Intel i82557, i82558,
     i82559, i82550, and i82562 chips.  The driver supports TCP/UDP/IP checksum offload for both
     transmit and receive on i82550 and i82551.  On i82559 only TCP/UDP checksum offload for
     receive is supported.  TCP segmentation offload (TSO) for IPv4 as well as VLAN hardware tag
     insertion/stripping is supported on i82550 and i82551.  Wake On Lan (WOL) support is
     provided on all controllers except i82557, i82259ER and early i82558 revisions.

     The fxp driver supports the following media types:

     autoselect   Enable autoselection of the media type and options.  The autoselected mode can
                  be overridden by adding the media options to rc.conf(5).

     10baseT/UTP  Set 10Mbps operation.

     100baseTX    Set 100Mbps (Fast Ethernet) operation.

     The fxp driver supports the following media options:

     full-duplex  Force full duplex operation.

     half-duplex  Force half duplex operation.

     Note that 100baseTX media type is not available on the Pro/10.  For further information on
     configuring this device, see ifconfig(8).

     The fxp driver supports reception and transmission of extended frames for vlan(4).  This
     capability of fxp can be controlled by means of the vlanmtu parameter to ifconfig(8).

     The fxp driver also supports a special link option:

     link0  Some chip revisions have loadable microcode which can be used to reduce the interrupt
            load on the host cpu.  Not all boards have microcode support.  Setting the link0 flag
            with ifconfig(8) will download the microcode to the chip if it is available.


     Adapters supported by the fxp driver include:

        Intel EtherExpress PRO/10
        Intel InBusiness 10/100
        Intel PRO/100B / EtherExpressPRO/100 B PCI Adapter
        Intel PRO/100+ Management Adapter
        Intel PRO/100 VE Desktop Adapter
        Intel PRO/100 VM Network Connection
        Intel PRO/100 M Desktop Adapter
        Intel PRO/100 S Desktop, Server and Dual-Port Server Adapters
        Many on-board network interfaces on Intel motherboards


     Tunables can be set at the loader(8) prompt before booting the kernel or stored in
     loader.conf(5).  The following variables are available as both loader(8) tunables and
     sysctl(8) variables:

             Maximum amount of time, in microseconds, that an interrupt may be delayed in an
             attempt to coalesce interrupts.  This is only effective if the Intel microcode is
             loaded.  The accepted range is 300 to 3000, the default is 1000.

             Number of packets that will be bundled, before an interrupt is generated.  This is
             only effective if the Intel microcode is loaded.  The accepted range is 1 to 65535,
             the default is 6.


     The following variables are available as sysctl(8) variables.

             This is a read-only variable and shows the number of events of RNR (resource not

             This is a read-only variable and displays useful MAC counters maintained in the


     fxp%d: couldn't map memory  A fatal initialization error has occurred.

     fxp%d: couldn't map interrupt  A fatal initialization error has occurred.

     fxp%d: Failed to malloc memory  There are not enough mbuf's available for allocation.

     fxp%d: device timeout  The device has stopped responding to the network, or there is a
     problem with the network connection (cable).

     fxp%d: Microcode loaded, int_delay: %d usec  bundle_max: %d  The chip has successfully
     downloaded the microcode, and changed the parameterized values to the given settings.


     altq(4), arp(4), miibus(4), netintro(4), ng_ether(4), polling(4), vlan(4), ifconfig(8)


     The fxp device driver first appeared in FreeBSD 2.1.


     The fxp device driver was written by David Greenman.  It has then been updated to use the
     busdma API and made endian-clean by Maxime Henrion.  This manual page was written by David
     E. O'Brien.