NAME    [Toc]    [Back]

     txp - 3Com 3XP Typhoon/Sidewinder (3CR990)  Ethernet  interface

SYNOPSIS    [Toc]    [Back]

     txp* at pci? dev ? function ?

DESCRIPTION    [Toc]    [Back]

     The  txp interface provides access to the 10Mb/s and 100Mb/s
Ethernet networks
 via the 3Com Typhoon/Sidewinder chipset.  This  driver
supports the
     following cards:

           +o   3Com 3CR990-TX-95
           +o   3Com 3CR990-TX-97
           +o   3Com 3CR990SVR95
           +o   3Com 3CR990SVR97

     Basic Ethernet functions are provided as well as support for
vlan(4) tag
     removal and insertion assistance, receive ip(4), tcp(4), and
udp(4)
     checksum offloading, and transmit ip(4) checksum offloading.
There is
     currently no support for transmit tcp(4) or udp(4)  checksum
offloading,
     tcp(4)  segmentation,  nor ipsec(4) acceleration.  Note that
hardware
     checksumming is only used  when  the  interface  is  not  in
bridge(4) mode.

     Each  of  the  host's network addresses is specified at boot
time with an
     SIOCSIFADDR ioctl(2).  The txp interface employs the address
resolution
     protocol  described in arp(4) to dynamically map between Internet and Ethernet
 addresses on the local network.

     When a txp interface is brought up, by default, it will  attempt to autonegotiate
  the  link  speed and duplex mode.  The speeds, in
order of attempt,
 are: 100Mb/s Full Duplex,  100Mb/s  Half  Duplex,  10
Mb/s Full Duplex,
 and 10 Mb/s Half Duplex.

     The txp supports several media types, which are selected via
the
     ifconfig(8) command.  The supported media types are:

           media autoselect
                   Attempt to autoselect the media type (default)

           media 100baseTX mediaopt full-duplex
                   Use 100baseTX, full duplex

           media 100baseTX [mediaopt half-duplex]
                   Use 100baseTX, half duplex

           media 10baseT mediaopt full-duplex
                   Use 10baseT, full duplex

           media 10baseT [mediaopt half-duplex]
                   Use 10baseT, half duplex

SEE ALSO    [Toc]    [Back]

     arp(4),  ifmedia(4),  inet(4), intro(4), ip(4), netintro(4),
pci(4),
     tcp(4), udp(4), vlan(4), hostname.if(5), ifconfig(8)

HISTORY    [Toc]    [Back]

     The txp driver first appeared in OpenBSD 2.9.

OpenBSD     3.6                          April      15,      2001