SK(4)                     OpenBSD Programmer's Manual                    SK(4)

NAME
     sk - SysKonnect SK-984x PCI Gigabit Ethernet driver

SYNOPSIS
     skc* at pci? dev ? function ?
     sk* at skc?

DESCRIPTION
     The sk driver provides support for the SysKonnect SK-984x series PCI Gi-
     gabit Ethernet adapters, including the following:

           o   SK-9821 SK-NET GE-T single port, copper adapter
           o   SK-9822 SK-NET GE-T dual port, copper adapter
           o   SK-9841 SK-NET GE-LX single port, single mode fiber adapter
           o   SK-9842 SK-NET GE-SX single port, multimode fiber adapter
           o   SK-9843 SK-NET GE-LX dual port, single mode fiber adapter
           o   SK-9844 SK-NET GE-SX dual port, multimode fiber adapter

     The SysKonnect adapters consist of two main components: the XaQti Corp.
     XMAC II Gigabit MAC (sk) and the SysKonnect GEnesis controller ASIC
     (skc).  The XMAC provides the Gigabit MAC and PHY support while the GEne-
     sis provides an interface to the PCI bus, DMA support, packet buffering
     and arbitration.  The GEnesis can control up to two XMACs simultaneously,
     allowing dual-port NIC configurations.

     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 net-
     works.  The SysKonnect driver software currently only uses the second
     port on dual port adapters for failover purposes: if the link on the pri-
     mary port fails, the SysKonnect driver will automatically switch traffic
     onto the second port.

     The XaQti XMAC II supports full and half duplex operation with autonego-
     tiation.  The XMAC also supports unlimited frame sizes.  Support for jum-
     bo frames is provided via the interface MTU setting.  Selecting an MTU
     larger than 1500 bytes with the ifconfig(8) utility configures 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 following media types and options (as given to ifconfig(8)) are sup-
     ported:

           media autoselect
                Enable autoselection of the media type and options.  The user
                can manually override the autoselected mode by adding media
                options to the appropriate /etc/hostname.skX file.

           media 1000baseSX mediaopt full-duplex
                Set 1000Mbps (Gigabit Ethernet) operation on fiber and force
                full-duplex mode.

           media 1000baseSX mediaopt half-duplex
                Set 1000Mbps (Gigabit Ethernet) operation on fiber and force
                full-duplex mode.

           media 1000baseT mediaopt
                Set 1000Mbps (Gigabit Ethernet) operation and force full-du-
                plex mode.

     For more information on configuring this device, see ifconfig(8). To view
     a list of media types and options supported by your card try ifconfig -m
     <device>. For example, ifconfig -m sk0.

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: 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 allocate 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
     ifmedia(4), ifconfig(8)

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

     SysKonnect GEnesis programming manual, http://www.syskonnect.com.

HISTORY
     The sk device driver first appeared in FreeBSD 3.0, and OpenBSD support
     was added in OpenBSD 2.6.

AUTHORS
     The sk driver was written by Bill Paul <wpaul@ctr.columbia.edu>.

OpenBSD 3.0                      July 3, 1999                                2
