NAME
txp —
3Com 3XP Typhoon/Sidewinder (3CR990)
Ethernet interface
SYNOPSIS
device txp
DESCRIPTION
Thetxp interface provides access to the 10Mb/s and
100Mb/s Ethernet networks via the 3Com Typhoon/Sidewinder chipset. This driver
supports the following cards:
- 3Com 3CR990-TX-95
- 3Com 3CR990-TX-97
- 3Com 3cR990B-TXM
- 3Com 3CR990SVR95
- 3Com 3CR990SVR97
- 3Com 3cR990B-SRV
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, nor tcp(4) segmentation. 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 auto-negotiate 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
arp(4), ifmedia(4), inet(4), intro(4), ip(4), tcp(4), udp(4), vlan(4), ifconfig(8)
HISTORY
The txp driver first appeared in
OpenBSD 2.9.