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+.\" Copyright (c) 2006 Pyun YongHyeon
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd Dec 13, 2006
+.Dt MSK 4
+.Os
+.Sh NAME
+.Nm msk
+.Nd Marvell/SysKonnect Yukon II Gigabit Ethernet adapter driver
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following lines in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device miibus"
+.Cd "device msk"
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+if_msk_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+device driver provides support for various NICs based on the
+Marvell/SysKonnect Yukon II Gigabit Ethernet controller chip.
+.Pp
+All NICs supported by the
+.Nm
+driver have TCP/UDP/IP checksum offload for transmit, TCP
+segmentation offload(TSO), hardware VLAN tag stripping/insertion
+features and interrupt moderation mechanism as well as a 64-bit
+multicast hash filter.
+The Yukon II supports TBI (ten bit interface) and GMII
+transceivers, which means it can be used with either copper or
+1000baseX fiber applications.
+.Pp
+The Yukon II also support jumbo frames(up to 9022 bytes), which can be
+configured via the interface MTU setting.
+Selecting an MTU larger than 1500 bytes with the
+.Xr ifconfig 8
+utility configures the adapter to receive and transmit jumbo frames.
+.Pp
+The
+.Nm
+driver supports the following media types:
+.Bl -tag -width ".Cm 10baseT/UTP"
+.It Cm autoselect
+Enable autoselection of the media type and options.
+The user can manually override
+the autoselected mode by adding media options to
+.Xr rc.conf 5 .
+.It Cm 10baseT/UTP
+Set 10Mbps operation.
+The
+.Xr ifconfig 8
+.Cm mediaopt
+option can also be used to select either
+.Cm full-duplex
+or
+.Cm half-duplex
+modes.
+.It Cm 100baseTX
+Set 100Mbps (Fast Ethernet) operation.
+The
+.Xr ifconfig 8
+.Cm mediaopt
+option can also be used to select either
+.Cm full-duplex
+or
+.Cm half-duplex
+modes.
+.It Cm 1000baseTX
+Set 1000baseTX operation over twisted pair.
+The
+.Xr ifconfig 8
+.Cm mediaopt
+option can also be used to select either
+.Cm full-duplex
+or
+.Cm half-duplex
+modes.
+.It Cm 1000baseSX
+Set 1000Mbps (Gigabit Ethernet) operation.
+Both
+.Cm full-duplex
+and
+.Cm half-duplex
+modes are supported.
+.El
+.Pp
+The
+.Nm
+driver supports the following media options:
+.Bl -tag -width ".Cm full-duplex"
+.It Cm full-duplex
+Force full duplex operation.
+.It Cm half-duplex
+Force half duplex operation.
+.El
+.Pp
+The
+.Nm
+driver also supports one special link option for 1000baseTX cards:
+.Bl -tag -width ".Cm link0"
+.It Cm 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
+.Nm
+driver configures the ports as slaves by default.
+Setting the
+.Cm link0
+flag with
+.Xr ifconfig 8
+will set a port as a master instead.
+.El
+.Pp
+For more information on configuring this device, see
+.Xr ifconfig 8 .
+.Sh HARDWARE
+The
+.Nm
+driver provides support for various NICs based on the Marvell/SysKonnect
+Yukon II based Gigabit Ethernet controller chips, including:
+.Pp
+.Bl -bullet -compact
+.It
+SysKonnect SK-9Sxx Gigabit Ethernet
+.It
+SysKonnect SK-9Exx Gigabit Ethernet
+.It
+Marvell Yukon 88E8021CU Gigabit Ethernet
+.It
+Marvell Yukon 88E8021 SX/LX Gigabit Ethernet
+.It
+Marvell Yukon 88E8022CU Gigabit Ethernet
+.It
+Marvell Yukon 88E8022 SX/LX Gigabit Ethernet
+.It
+Marvell Yukon 88E8061CU Gigabit Ethernet
+.It
+Marvell Yukon 88E8061 SX/LX Gigabit Ethernet
+.It
+Marvell Yukon 88E8062CU Gigabit Ethernet
+.It
+Marvell Yukon 88E8062 SX/LX Gigabit Ethernet
+.It
+Marvell Yukon 88E8035 Gigabit Ethernet
+.It
+Marvell Yukon 88E8036 Gigabit Ethernet
+.It
+Marvell Yukon 88E8038 Gigabit Ethernet
+.It
+Marvell Yukon 88E8050 Gigabit Ethernet
+.It
+Marvell Yukon 88E8052 Gigabit Ethernet
+.It
+Marvell Yukon 88E8053 Gigabit Ethernet
+.It
+Marvell Yukon 88E8055 Gigabit Ethernet
+.It
+Marvell Yukon 88E8056 Gigabit Ethernet
+.It
+D-Link 550SX Gigabit Ethernet
+.It
+D-Link 560T Gigabit Ethernet
+.El
+.Sh LOADER TUNABLES
+Tunables can be set at the
+.Xr loader 8
+prompt before booting the kernel or stored in
+.Xr loader.conf 5 .
+.Bl -tag -width indent
+.It Va hw.msk.msi_disable
+This tunable disables MSI support on the Ethernet hardware.
+The default value is 0.
+.El
+.Sh SYSCTL VARIABLES
+The following variables are available as both
+.Xr sysctl 8
+variables and
+.Xr loader 8
+tunables:
+.Bl -tag -width indent
+.It Va dev.mskc.%d.process_limit
+Maximum amount of Rx events to be processed in event loop before
+rescheduling a taskqueue.
+The accepted range is 30 to 256, default value is 128 events.
+The interface does not need to be brought down and up again before
+a change takes effect.
+.El
+.Sh SEE ALSO
+.Xr arp 4 ,
+.Xr miibus 4 ,
+.Xr netintro 4 ,
+.Xr ng_ether 4 ,
+.Xr vlan 4 ,
+.Xr ifconfig 8
+.Sh HISTORY
+The
+.Nm
+driver was written by
+.An Pyun YongHyeon
+.Aq yongari@FreeBSD.org
+and it is based on the
+.Xr sk 4
+and Marvell's FreeBSD driver.