SK(4)

NAME
sk, skc - SysKonnect XMAC II and Marvell Yukon 10/100/Gigabit Ethernet device

SYNOPSIS
skc* at pci?
sk* at skc?
brgphy* at mii?
eephy* at mii?
xmphy* at mii?

DESCRIPTION
The sk driver provides support for SysKonnect GEnesis and Marvell Yukon 88E8001, 88E8003 and 88E8010 based Gigabit Ethernet adapters, including the following:

•   3Com 3c940 single port, copper adapter
•   3Com 3c2000-T single port, copper adapter
•   Belkin F5D5005 v1000, copper adapter
•   D-Link DGE-530T A1, copper adapter
•   D-Link DGE-530T B1, copper adapter
•   Fujitsu PP028GE1U, multimode fiber adapter
•   Fujitsu PP028GE1X, multimode fiber adapter
•   Fujitsu PW008GE1U, copper adapter
•   Fujitsu PW008GE1X, copper adapter
•   Linksys EG1032v2, copper adapter
•   Linksys EG1064v2, copper adapter
•   SMC 9452TX, copper adapter
•   SysKonnect SK-9521 V2.0 single port, copper adapter
•   SysKonnect SK-9821 single port, copper adapter
•   SysKonnect SK-9821 V2.0 single port, copper adapter
•   SysKonnect SK-9822 dual port, copper adapter
•   SysKonnect SK-9841 single port, single mode fiber adapter
•   SysKonnect SK-9842 dual port, single mode fiber adapter
•   SysKonnect SK-9843 single port, multimode fiber adapter
•   SysKonnect SK-9843 V2.0 single port, copper adapter
•   SysKonnect SK-9844 dual port, multimode fiber adapter

The SysKonnect based 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 GEnesis 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 Marvell based adapters are a single integrated circuit, but are still presented as a separate MAC (sk) and controller ASIC (skc).

The GEnesis and Yukon 88E8001, 88E8003 and 88E8010 also support a frame size of up to 9000 bytes. Support for Jumbo frames is provided via the interface MTU setting. Selecting an MTU larger than 1500 bytes with the ifconfig(8) utility configures the adapter to transmit Jumbo frames. Using Jumbo frames can greatly improve performance for certain tasks, such as file transfers and data streaming.

Hardware receive IP checksum offload for IPv4 is supported.

The sk driver supports the following media types:

autoselect
    Enable autoselection of the media type and options. The user can manually override the autoselected mode by adding media options to the appropriate hostname.if(5) file.

10baseT
    Set 10Mbps operation. The ifconfig(8) mediaopt option can also be used to select either full-duplex or half-duplex modes.

100baseTX
    Set 100Mbps (Fast Ethernet) operation. The ifconfig(8) mediaopt option can also be used to select either full-duplex or half-duplex modes.

1000baseT
    Set 1000baseT (Gigabit Ethernet) operation over twisted pair. Both full-duplex and half-duplex modes are supported.

1000baseSX
    Set 1000Mbps (Gigabit Ethernet) operation. 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.

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

SEE ALSO
arp(4), brgphy(4), eephy(4), ifmedia(4), intro(4), netintro(4), pci(4), xmphy(4), hostname.if(5), ifconfig(8) XaQti XMAC II datasheet. 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
-nosplit The sk driver was written by Bill Paul <wpaul@ctr.columbia.edu>.