sk(4)

NAME

sk - SysKonnect SK-984x and SK-982x PCI Gigabit Ethernet

adapter driver

SYNOPSIS

To  compile this driver into the kernel, place the following
lines in your
kernel configuration file:
      device miibus
      device sk
Alternatively, to load the driver as a module at boot  time,
place the
following line in loader.conf(5):
      if_sk_load="YES"

DESCRIPTION

The sk driver provides support for the SysKonnect SK-984x

and SK-982x
series PCI Gigabit Ethernet adapters.

The SysKonnect adapters consist of two main components: the

XaQti Corp.
XMAC II gigabit MAC and the SysKonnect GEnesis controller

ASIC. The XMAC
provides the gigabit MAC and PHY support while the GEnesis

provides an
interface to the PCI bus, DMA support, packet buffering and

arbitration.
The GEnesis can control up to two XMACs simultaneously, al

lowing dualport NIC configurations.

The SK-982x 1000baseT adapters also include a Broadcom

BCM5400 1000baseTX
PHY which is used in place of the XMAC's internal PHY. The

Broadcom PHY
is connected to the XMAC via its GMII port.

The sk driver configures dual port SysKonnect adapters such

that each
XMAC is treated as a separate logical network interface.

Both ports can
operate independently of each other and can be connected to

separate networks. The SysKonnect driver software currently only uses

the second
port on dual port adapters for failover purposes: if the

link on the primary port fails, the SysKonnect driver will automatically

switch traffic
onto the second port.

Also supported is the Marvell Semiconductor 88E1000* gigabit

PHY.

The XaQti XMAC II supports full and half duplex operation

with autonegotiation. The XMAC also supports unlimited frame sizes.

Support for
jumbo frames is provided via the interface MTU setting. Se

lecting an MTU
larger than 1500 bytes with the ifconfig(8) utility config

ures the
adapter to receive and transmit jumbo frames. Using jumbo

frames can
greatly improve performance for certain tasks, such as file

transfers and
data streaming.

The sk driver supports the following media types:

autoselect Enable autoselection of the media type

and options.

The user can manually override the au

toselected
mode by adding media options to the

/etc/rc.conf
file.

1000baseTX Set 1000baseTX operation over twisted

pair. This

is only available for SK-982x series

adapters with
1000baseT ports. Both full-duplex and

half-duplex
modes are supported.

1000baseSX Set 1000Mbps (Gigabit Ethernet) opera

tion. Both

full-duplex and half-duplex modes are

supported.

The sk driver supports the following media options:

full-duplex Force full duplex operation

half-duplex Force half duplex operation.

The sk driver also supports one special link option for

1000baseTX cards:

link0 With 1000baseTX cards, establishing a

link between

two ports requires that one port is

configured as
master and the other one as slave.

With autonegotiation, the master/slave settings

will be chosen
automatically. However when manually

selecting the
link state, it is necessary to force

one side of
the link to be a master and the other

a slave. The
sk driver configures the ports as

slaves by
default. Setting the link0 flag with

ifconfig(8)
will set a port as a master instead.

For more information on configuring this device, see ifcon

fig(8).

HARDWARE

Adapters supported by the sk driver include:

+o 3Com 3C940 single port, 1000baseT adapter
+o 3Com 3C2000-T single port, 1000baseT adapter
+o Belkin F5D5005 single port, 1000baseT adapter
+o D-Link DGE-530T single port, 1000baseT adapter
+o Linksys EG1032 single port, 1000baseT adapter
+o SK-9521 SK-NET GE-T single port, 1000baseT adapter
+o SK-9821 SK-NET GE-T single port, 1000baseT adapter
+o SK-9822 SK-NET GE-T dual port, 1000baseT adapter
+o SK-9841 SK-NET GE-LX single port, single mode fiber

adapter
+o SK-9842 SK-NET GE-LX dual port, single mode fiber

adapter
+o SK-9843 SK-NET GE-SX single port, multimode fiber

adapter
+o SK-9844 SK-NET GE-SX dual port, multimode fiber adapter
+o SMC 9452TX single port, 1000baseT adapter

SYSCTL VARIABLES

The following variable is available as both sysctl(8) vari

able and
loader(8) tunable:

dev.skc.%d.int_mod

This variable controls interrupt moderation. The

accepted range
is 10 to 10000, default value is 100 microseconds.

The interface
has to be brought down and up again before a change

takes effect.

DIAGNOSTICS

sk%d: couldn't map memory A fatal initialization error has

occurred.

sk%d: couldn't map ports A fatal initialization error has

occurred.

sk%d: couldn't map interrupt A fatal initialization error

has occurred.

sk%d: no memory for softc struct! The driver failed to al

locate memory
for per-device instance information during initialization.

sk%d: failed to enable memory mapping! The driver failed to

initialize
PCI shared memory mapping. This might happen if the card is

not in a
bus-master slot.

sk%d: no memory for jumbo buffers! The driver failed to al

locate memory
for jumbo frames during initialization.

sk%d: watchdog timeout The device has stopped responding to

the network,
or there is a problem with the network connection (cable).

SEE ALSO

arp(4), miibus(4), netintro(4), ng_ether(4), vlan(4), ifcon

fig(8)

XaQti XMAC II datasheet, http://www.xaqti.com.

SysKonnect GEnesis programming manual, http://www.syskon

nect.com.

HISTORY

The sk device driver first appeared in FreeBSD 3.0.

AUTHORS

The sk driver was written by Bill Paul

<wpaul@ctr.columbia.edu>.

BSD July 16, 2005

BSD