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):
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, allowing dual-port 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 88E100* 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. 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
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
/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) 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).
HARDWARE¶
Adapters supported by the
sk
driver include:
- 3Com 3C940 single port, 1000baseT adapter
- 3Com 3C2000-T single port, 1000baseT adapter
- Belkin F5D5005 single port, 1000baseT adapter
- D-Link DGE-530T single port, 1000baseT adapter
- Linksys (revision 2) single port, 1000baseT adapter
- SK-9521 SK-NET GE-T single port, 1000baseT adapter
- SK-9821 SK-NET GE-T single port, 1000baseT adapter
- SK-9822 SK-NET GE-T dual port, 1000baseT 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
- SMC 9452TX single port, 1000baseT adapter
LOADER TUNABLES¶
Tunables can be set at the
loader(8) prompt before
booting the kernel or stored in
loader.conf(5).
- hw.skc.jumbo_disable
- Disable jumbo frame support. Systems with less memory can set it to a
non-zero value to save memory. The default value is 0.
SYSCTL VARIABLES¶
The following variable is available as both
sysctl(8) variable and
loader(8) tunable:
- dev.skc.%d.int_mod
- This variable controls interrupt moderation. The accepted range is 10 to
10000. The 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 allocate 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 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¶
altq(4),
arp(4),
miibus(4),
netintro(4),
ng_ether(4),
vlan(4),
ifconfig(8)
XaQti XMAC II datasheet,
http://people.freebsd.org/~wpaul/SysKonnect/xmacii_datasheet_rev_c_9-29.pdf.
SysKonnect GEnesis programming
manual,
http://www.syskonnect.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⟩.