sk(4) - NetBSD Manual Pages

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SK(4)                   NetBSD Kernel Interfaces Manual                  SK(4)

sk, skc -- SysKonnect XMAC II and Marvell GMAC based gigabit ethernet
skc* at pci? dev ? function ? sk* at skc?
The sk driver provides support for SysKonnect based gigabit ethernet adapters and Marvell based gigabit ethernet adapters, including the fol- lowing: SK-9821 SK-NET GE-T single port, copper adapter SK-9822 SK-NET GE-T dual port, copper adapter SK-9841 SK-NET GE-LX single port, single mode fiber adapter SK-9842 SK-NET GE-LX dual port, single mode fiber adapter SK-9843 SK-NET GE-SX single port, multimode fiber adapter SK-9844 SK-NET GE-SX dual port, multimode fiber adapter SK-9521 V2.0 single port, copper adapter (32-bit) SK-9821 V2.0 single port, copper adapter SK-9843 V2.0 single port, copper adapter 3com 3c940 single port, copper adapter Belkin Gigabit Desktop Network PCI Card, single port, copper (32-bit) D-Link DGE-530T single port, copper adapter Linksys EG1032v2 single-port, copper adapter Linksys EG1064v2 single-port, copper 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 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 Marvell based adapters are a single integrated circuit, but are still presented as a separate MAC (sk) and controller ASIC (skc). At this time, there are no dual-port Marvell based NICs. 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 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 receive and transmit jumbo frames. Using jumbo frames can greatly improve performance for certain tasks, such as file transfers and data streaming. Hardware TCP/IP checksum offloading for IPv4 is supported. 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. 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 half-duplex mode. media 1000baseT mediaopt full-duplex Set 1000Mbps (Gigabit Ethernet) operation and force full- duplex mode. 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 -m <device>. For example, ifconfig -m sk0.
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).
ifmedia(4), intro(4), netintro(4), pci(4), ifconfig(8) XaQti XMAC II datasheet, SysKonnect GEnesis programming manual,
The sk device driver first appeared in FreeBSD 3.0. OpenBSD support was added in OpenBSD 2.6. NetBSD support was added in NetBSD 2.0.
The sk driver was written by Bill Paul <>.
This driver is experimental. Support for the jumbo-frame feature does not currently work with Marvell- based adapters under NetBSD and is disabled. Support for checksum offload is unimplemented. Performance with at least some Marvell-based adapters is poor, especially on loaded PCI buses or when the adapters are behind PCI-PCI bridges. It is believed that this is because the Marvell parts have significantly less buffering than the original SysKonnect cards had. NetBSD 3.1 January 23, 2005 NetBSD 3.1
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