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181 lines
4.9 KiB
Groff
181 lines
4.9 KiB
Groff
.\"
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.\" Copyright (c) 2007 The DragonFly Project. 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
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.\" are met:
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.\"
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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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
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.\" the documentation and/or other materials provided with the
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.\" distribution.
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.\" 3. Neither the name of The DragonFly Project nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from 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
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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.\" FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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.\" COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
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.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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.\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 14, 2008
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.Dt ET 4
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.Os
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.Sh NAME
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.Nm et
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.Nd "Agere ET1310 10/100/Gigabit Ethernet 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 lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device miibus"
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.Cd "device et"
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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_et_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 supports PCI Express Ethernet adapters based on the Agere ET1310 chip.
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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 setting for Jumbo Frames is 15572.
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.\"This value coincides with the maximum Jumbo Frames size of 15594.
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.Pp
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The
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.Nm
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driver supports the following media types:
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.Pp
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.Bl -tag -width 10baseT/UTP -compact
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.It autoselect
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Enable autoselection of the media types and options.
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The user can manually override
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the autoselected mode by adding media options to the
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.Pa /etc/rc.conf
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file.
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.Pp
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.It 10baseT/UTP
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Set 10Mbps operation.
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The
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.Ar mediaopt
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option can also be used to select either
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.Ar full-duplex
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or
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.Ar half-duplex
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modes.
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.Pp
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.It 100baseTX
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Set 100Mbps (Fast Ethernet) operation.
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The
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.Ar mediaopt
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option can also be used to select either
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.Ar full-duplex
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or
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.Ar half-duplex
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modes.
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.Pp
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.It 1000baseT
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Set 1000Mbps (Gigabit Ethernet) operation.
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The
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.Ar mediaopt
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option can only be set to
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.Ar full-duplex
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mode.
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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
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.Ar media
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options:
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.Pp
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.Bl -tag -width full-duplex -compact
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.It full-duplex
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Force full-duplex operation.
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.Pp
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.It half-duplex
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Force half-duplex operation.
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.El
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.Pp
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Note that the 1000baseT media type is only available
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if it is supported by the adapter.
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For more information on configuring this device, see
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.Xr ifconfig 8 .
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.Sh TUNABLES
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.Bl -tag -width ".Va hw.et.rx_intr_npkts"
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.It Va hw.et.rx_intr_npkts
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This value controls how many packets should be received
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before a receive interrupt is generated.
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The default value is 32.
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It is recommended to set this value above 38 to prevent the host from being
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livelocked under a high degree of stress.
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.It Va hw.et.rx_intr_delay
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This value delays the generation of receive interrupts
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in units of ~4 microseconds.
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It is used together with
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.Va hw.et.rx_intr_npkts
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to achieve RX interrupt moderation.
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The default value is 20.
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.It Va hw.et.tx_intr_nsegs
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This value controls how many segments (not packets) should be transmitted
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before a transmit interrupt is generated.
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The default value is 126.
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It is recommended to set this value below 280 to prevent
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the TX ring from underflowing.
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.It Va hw.et.timer
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This value controls how often a timer interrupt should be generated.
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It is used together with
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.Va hw.et.tx_intr_nsegs
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to achieve TX interrupt moderation.
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The default value is 1000000000 (nanoseconds).
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.El
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.Sh SEE ALSO
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.Xr arp 4 ,
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.Xr miibus 4 ,
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.Xr netintro 4 ,
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.Xr ng_ether 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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.Dx 1.11 .
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The first
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.Fx
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release to include it was
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.Fx 8.0 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An Sepherosa Ziehau Aq sepherosa@gmail.com
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for
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.Dx .
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It was ported to
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.Fx
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by
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.An Xin LI Aq delphij@FreeBSD.org .
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