Only a few of the loader tunables / sysctl variables are documented,

as I'm not really sure what the rest do.

The list of adaptors was found at
http://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&Inst=Yes&DwnldID=15815

MFC after:	1 week

2 files changed, 197 insertions, 0 deletions

diff --git a/share/man/man4/Makefile b/share/man/man4/Makefile
index ae6c37f..38a4743 100644
--- a/share/man/man4/Makefile
+++ b/share/man/man4/Makefile
@@ -126,6 +126,7 @@ MAN=	aac.4 \
 	ieee80211.4 \
 	if_bridge.4 \
 	ifmib.4 \
+	igb.4 \
 	iic.4 \
 	iicbb.4 \
 	iicbus.4 \
diff --git a/share/man/man4/igb.4 b/share/man/man4/igb.4
new file mode 100644
index 0000000..86bcc73
--- /dev/null
+++ b/share/man/man4/igb.4
@@ -0,0 +1,196 @@
+.\" Copyright (c) 2001-2003, Intel Corporation
+.\" 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.
+.\"
+.\" 3. Neither the name of the Intel Corporation nor the names of its
+.\"    contributors may be used to endorse or promote products derived from
+.\"    this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
+.\"
+.\" * Other names and brands may be claimed as the property of others.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd October 6, 2008
+.Dt IGB 4
+.Os
+.Sh NAME
+.Nm igb
+.Nd "Intel(R) PRO/1000 PCI Express Gigabit Ethernet adapter driver"
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following line in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device igb"
+.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_igb_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for PCI Express Gigabit Ethernet adapters
+based on the Intel 82575 and 82576 Ethernet controller chips.
+The driver supports Transmit/Receive checksum offload and Jumbo
+Frames.
+Furthermore it supports TCP segmentation offload (TSO) on all
+adapters.
+.Pp
+For questions related to hardware requirements, refer to the
+documentation supplied with your Intel PRO/1000 adapter.
+All hardware requirements listed apply to use with
+.Fx .
+.Pp
+Support for Jumbo Frames is provided 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.
+The maximum MTU size for Jumbo Frames is 9216.
+.Pp
+This driver supports hardware assisted VLANs.
+The
+.Nm
+driver supports the following media types:
+.Bl -tag -width ".Cm 10baseT/UTP"
+.It Cm autoselect
+Enables auto-negotiation for speed and duplex.
+.It Cm 10baseT/UTP
+Sets 10Mbps operation.
+Use the
+.Cm mediaopt
+option to select
+.Cm full-duplex
+mode.
+.It Cm 100baseTX
+Sets 100Mbps operation.
+Use the
+.Cm mediaopt
+option to select
+.Cm full-duplex
+mode.
+.It Cm 1000baseSX
+Sets 1000Mbps operation.
+Only
+.Cm full-duplex
+mode is supported at this speed.
+.It Cm 1000baseTX
+Sets 1000Mbps operation.
+Only
+.Cm full-duplex
+mode is supported at this speed.
+.El
+.Pp
+The
+.Nm
+driver supports the following media options:
+.Bl -tag -width ".Cm full-duplex"
+.It Cm full-duplex
+Forces full-duplex operation
+.It Cm half-duplex
+Forces half-duplex operation.
+.El
+.Pp
+Only use
+.Cm mediaopt
+to set the driver to
+.Cm full-duplex .
+If
+.Cm mediaopt
+is not specified, the driver defaults to
+.Cm half-duplex .
+.Pp
+For more information on configuring this device, see
+.Xr ifconfig 8 .
+.Sh HARDWARE
+The
+.Nm
+driver supports Gigabit Ethernet adapters based on the Intel 82575 and
+82576 controller chips:
+.Pp
+.Bl -bullet -compact
+.It
+Intel Gigabit ET Dual Port Server Adapter (82576)
+.It
+Intel Gigabit VT Quad Port Server Adapter (82575)
+.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.igb.rxd
+Number of receive descriptors allocated by the driver.
+The default value is 256.
+The minimum is 80, and the maximum is 4096.
+.It Va hw.igb.txd
+Number of transmit descriptors allocated by the driver.
+The default value is 256.
+The minimum is 80, and the maximum is 4096.
+.It Va hw.igb.enable_aim
+If set to 1, enable Adaptive Interrupt Moderation.
+The default is to enable Adaptive Interrupt Moderation.
+.El
+.Sh DIAGNOSTICS
+.Bl -diag
+.It "igb%d: Unable to allocate bus resource: memory"
+A fatal initialization error has occurred.
+.It "igb%d: Unable to allocate bus resource: interrupt"
+A fatal initialization error has occurred.
+.It "igb%d: watchdog timeout -- resetting"
+The device has stopped responding to the network, or there is a problem with
+the network connection (cable).
+.El
+.Sh SUPPORT
+For general information and support,
+go to the Intel support website at:
+.Pa http://support.intel.com .
+.Pp
+If an issue is identified with the released source code on the supported kernel
+with a supported adapter, email the specific information related to the
+issue to
+.Aq freebsdnic@mailbox.intel.com .
+.Sh SEE ALSO
+.Xr altq 4 ,
+.Xr arp 4 ,
+.Xr em 4 ,
+.Xr netintro 4 ,
+.Xr ng_ether 4 ,
+.Xr polling 4 ,
+.Xr vlan 4 ,
+.Xr ifconfig 8
+.Sh HISTORY
+The
+.Nm
+device driver first appeared in
+.Fx 7.1 .
+.Sh AUTHORS
+The
+.Nm
+driver was written by
+.An Intel Corporation Aq freebsdnic@mailbox.intel.com .