TXP(4) BSD Kernel Interfaces Manual TXP(4)
txp -- 3Com 3XP Typhoon/Sidewinder (3CR990) Ethernet interface
txp* at pci? dev ? function ?
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 inser-
tion 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 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:
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
arp(4), ifmedia(4), inet(4), intro(4), ip(4), netintro(4), pci(4), tcp(4), udp(4), vlan(4),
The txp driver first appeared in NetBSD 2.0.
BSD August 21, 2003 BSD