290 lines
8.1 KiB
Groff
290 lines
8.1 KiB
Groff
.\" Copyright (c) 2001-2003, Intel Corporation
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions are met:
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.\"
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.\" 1. Redistributions of source code must retain the above copyright notice,
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.\" this list of conditions and the following disclaimer.
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.\"
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" 3. Neither the name of the Intel Corporation nor the names of its
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.\" contributors may be used to endorse or promote products derived from
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.\" this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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.\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" * Other names and brands may be claimed as the property of others.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 11, 2011
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.Dt EM 4
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.Os
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.Sh NAME
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.Nm em
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.Nd "Intel(R) PRO/1000 Gigabit Ethernet adapter driver"
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following line in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device em"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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if_em_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for PCI Gigabit Ethernet adapters based on
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the Intel 82540, 82541ER, 82541PI, 82542, 82543, 82544, 82545, 82546,
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82546EB, 82546GB, 82547, 82571, 81572, 82573, and 82574 Ethernet
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controller chips.
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The driver supports Transmit/Receive checksum offload
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and Jumbo Frames on all but 82542-based adapters.
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Furthermore it supports TCP segmentation offload (TSO) on all adapters but
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those based on the 82543, 82544 and 82547 controller chips.
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The identification LEDs of the adapters supported by the
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.Nm
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driver can be controlled via the
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.Xr led 4
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API for localization purposes.
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For further hardware information, see the
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.Pa README
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included with the driver.
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.Pp
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For questions related to hardware requirements,
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refer to the documentation supplied with your Intel PRO/1000 adapter.
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All hardware requirements listed apply to use with
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.Fx .
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.Pp
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Support for Jumbo Frames is provided via the interface MTU setting.
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Selecting an MTU larger than 1500 bytes with the
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.Xr ifconfig 8
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utility configures the adapter to receive and transmit Jumbo Frames.
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The maximum MTU size for Jumbo Frames is 16114.
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.Pp
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This driver version supports VLANs.
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The
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.Nm
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driver supports the following media types:
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.Bl -tag -width ".Cm 10baseT/UTP"
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.It Cm autoselect
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Enables auto-negotiation for speed and duplex.
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.It Cm 10baseT/UTP
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Sets 10Mbps operation.
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Use the
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.Cm mediaopt
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option to select
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.Cm full-duplex
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mode.
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.It Cm 100baseTX
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Sets 100Mbps operation.
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Use the
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.Cm mediaopt
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option to select
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.Cm full-duplex
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mode.
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.It Cm 1000baseSX
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Sets 1000Mbps operation.
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Only
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.Cm full-duplex
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mode is supported at this speed.
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.It Cm 1000baseTX
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Sets 1000Mbps operation.
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Only
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.Cm full-duplex
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mode is supported at this speed.
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.El
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.Pp
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The
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.Nm
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driver supports the following media options:
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.Bl -tag -width ".Cm full-duplex"
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.It Cm full-duplex
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Forces full-duplex operation
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.It Cm half-duplex
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Forces half-duplex operation.
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.El
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.Pp
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Only use
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.Cm mediaopt
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to set the driver to
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.Cm full-duplex .
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If
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.Cm mediaopt
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is not specified, the driver defaults to
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.Cm half-duplex .
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.Pp
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For more information on configuring this device, see
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.Xr ifconfig 8 .
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.Sh HARDWARE
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The
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.Nm
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driver supports Gigabit Ethernet adapters based on the Intel
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82540, 82541ER, 82541PI, 82542, 82543, 82544, 82545, 82546, 82546EB,
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82546GB, 82547, 82571, 82572, 82573, and 82574 controller chips:
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.Pp
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.Bl -bullet -compact
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.It
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Intel PRO/1000 CT Network Connection (82547)
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.It
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Intel PRO/1000 F Server Adapter (82543)
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.It
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Intel PRO/1000 Gigabit Server Adapter (82542)
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.It
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Intel PRO/1000 GT Desktop Adapter (82541PI)
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.It
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Intel PRO/1000 MF Dual Port Server Adapter (82546)
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.It
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Intel PRO/1000 MF Server Adapter (82545)
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.It
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Intel PRO/1000 MF Server Adapter (LX) (82545)
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.It
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Intel PRO/1000 MT Desktop Adapter (82540)
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.It
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Intel PRO/1000 MT Desktop Adapter (82541)
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.It
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Intel PRO/1000 MT Dual Port Server Adapter (82546)
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.It
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Intel PRO/1000 MT Quad Port Server Adapter (82546EB)
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.It
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Intel PRO/1000 MT Server Adapter (82545)
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.It
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Intel PRO/1000 PF Dual Port Server Adapter (82571)
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.It
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Intel PRO/1000 PF Quad Port Server Adapter (82571)
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.It
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Intel PRO/1000 PF Server Adapter (82572)
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.It
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Intel PRO/1000 PT Desktop Adapter (82572)
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.It
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Intel PRO/1000 PT Dual Port Server Adapter (82571)
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.It
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Intel PRO/1000 PT Quad Port Server Adapter (82571)
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.It
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Intel PRO/1000 PT Server Adapter (82572)
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.It
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Intel PRO/1000 T Desktop Adapter (82544)
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.It
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Intel PRO/1000 T Server Adapter (82543)
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.It
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Intel PRO/1000 XF Server Adapter (82544)
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.It
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Intel PRO/1000 XT Server Adapter (82544)
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.El
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.Sh LOADER TUNABLES
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Tunables can be set at the
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.Xr loader 8
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prompt before booting the kernel or stored in
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.Xr loader.conf 5 .
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.Bl -tag -width indent
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.It Va hw.em.rxd
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Number of receive descriptors allocated by the driver.
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The default value is 1024 for adapters newer than 82547,
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and 256 for older ones.
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The 82542 and 82543-based adapters can handle up to 256 descriptors,
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while others can have up to 4096.
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.It Va hw.em.txd
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Number of transmit descriptors allocated by the driver.
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The default value is 1024 for adapters newer than 82547,
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and 256 for older ones.
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The 82542 and 82543-based adapters can handle up to 256 descriptors,
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while others can have up to 4096.
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.It Va hw.em.rx_int_delay
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This value delays the generation of receive interrupts in units of
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1.024 microseconds.
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The default value is 0, since adapters may hang with this feature
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being enabled.
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.It Va hw.em.rx_abs_int_delay
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If
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.Va hw.em.rx_int_delay
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is non-zero, this tunable limits the maximum delay in which a receive
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interrupt is generated.
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.It Va hw.em.tx_int_delay
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This value delays the generation of transmit interrupts in units of
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1.024 microseconds.
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The default value is 64.
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.It Va hw.em.tx_abs_int_delay
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If
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.Va hw.em.tx_int_delay
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is non-zero, this tunable limits the maximum delay in which a transmit
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interrupt is generated.
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.El
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.Sh FILES
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.Bl -tag -width /dev/led/em*
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.It Pa /dev/led/em*
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identification LED device nodes
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.El
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.Sh EXAMPLES
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Make the identification LED of em0 blink:
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.Pp
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.Dl "echo f2 > /dev/led/em0"
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.Pp
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Turn the identification LED of em0 off again:
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.Pp
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.Dl "echo 0 > /dev/led/em0"
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "em%d: Unable to allocate bus resource: memory"
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A fatal initialization error has occurred.
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.It "em%d: Unable to allocate bus resource: interrupt"
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A fatal initialization error has occurred.
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.It "em%d: watchdog timeout -- resetting"
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The device has stopped responding to the network, or there is a problem with
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the network connection (cable).
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.El
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.Sh SUPPORT
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For general information and support,
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go to the Intel support website at:
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.Pa http://support.intel.com .
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.Pp
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If an issue is identified with the released source code on the supported kernel
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with a supported adapter, email the specific information related to the
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issue to
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.Aq freebsd@intel.com .
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.Sh SEE ALSO
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.Xr altq 4 ,
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.Xr arp 4 ,
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.Xr igb 4 ,
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.Xr led 4 ,
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.Xr netintro 4 ,
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.Xr ng_ether 4 ,
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.Xr polling 4 ,
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.Xr vlan 4 ,
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.Xr ifconfig 8
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.Sh HISTORY
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The
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.Nm
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device driver first appeared in
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.Fx 4.4 .
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.Sh AUTHORS
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The
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.Nm
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driver was written by
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.An Intel Corporation Aq freebsd@intel.com .
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.Sh BUGS
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Hardware-assisted VLAN processing is disabled by default.
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You can enable it on an
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.Nm
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interface using
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.Xr ifconfig 8 .
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