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:
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 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