156 lines
5.1 KiB
Groff
156 lines
5.1 KiB
Groff
.\" $NetBSD: fxp.4,v 1.16 2008/04/30 13:10:54 martin Exp $
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.\"
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.\" Copyright (c) 1998, 2002 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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.\" NASA Ames Research Center.
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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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.\" 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 the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE 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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.Dd October 15, 2005
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.Dt FXP 4
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.Os
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.Sh NAME
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.Nm fxp
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.Nd Intel i8255x 10/100 Ethernet device driver
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.Sh SYNOPSIS
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.Cd "fxp* at cardbus? function ?"
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.Cd "fxp* at pci? dev ? function ?"
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.Sh DESCRIPTION
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The
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.Nm
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device driver supports Ethernet interfaces based on the Intel i82557,
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i82558, i82559, and i82550 10/100 PCI Ethernet chips.
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.Pp
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Certain versions of the i8255x support loading microcode which implements
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a receive interrupt mitigation function, known as
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.Dq CPUSaver .
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Use of this option can improve performance in some situations by reducing
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interrupt load on the host.
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This option is available on the following chip versions:
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.Pp
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.Bl -bullet -compact
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.It
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i82558 step A4 (rev 4)
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.It
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i82558 step B0 (rev 5)
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.It
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i82559 step A0 (rev 8)
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.It
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i82559S step A (rev 9)
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.It
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i82550 (rev 12)
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.It
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i82550 step C (rev 13)
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.El
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.Pp
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This option is enabled by setting the
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.Dq link0
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option with
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.Xr ifconfig 8 .
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.Pp
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Some chipset revisions can suffer from a receiver-side lockup bug which
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can be mitigated by resetting the chip every sixteen seconds without
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traffic.
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Since the probe for affected chipsets generates false positives
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and the workaround can cause momentary loss of responsiveness, particularly
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noticeable when playing audio, the workaround is not enabled by default.
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The boot messages will indicate if any interface may have this issue.
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The workaround is enabled by setting the
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.Dq link1
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option with
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.Xr ifconfig 8 .
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.Sh HARDWARE
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Cards supported by the
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.Nm
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driver include:
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.Pp
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.Bl -bullet -compact
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.It
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Intel EtherExpress Pro 10+
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.It
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Intel EtherExpress Pro 100B
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.It
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Intel EtherExpress Pro 100+
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.It
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Intel InBusiness 10/100
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.It
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Intel PRO/100 S
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.El
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.Sh MEDIA SELECTION
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Media selection is supported via MII.
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See
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.Xr ifmedia 4
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and
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.Xr mii 4
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for more information.
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.Pp
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EtherExpress Pro 10+ boards may use a Seeq 80c24 AutoDUPLEX(tm)
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media interface.
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Boards with these chips do not support media
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selection, as the 80c24 has no programming interface, and no
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way to read link status.
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These boards claim a media of "manual"
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since they self-configure based on the configuration of the link
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partner (hub or switch).
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "fxp0: WARNING: SCB timed out!"
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The driver timed out waiting for the chip's command interface to
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become ready.
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.It "fxp0: too many segments, aborting"
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The driver encountered a packet that included too many DMA segments,
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and was not able to allocate a new buffer to transmit the packet from.
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The packet has been dropped.
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.It "fxp0: too many segments, retrying"
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The driver encountered a packet that included too many DMA segments,
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and allocated a new buffer to transmit the packet from.
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.It "fxp0: can't load mbuf chain, error = %d"
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The driver was unable to load a transmit DMA map, and has reported the
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errno value.
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.It "fxp0: device timeout"
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The device failed to generate a transmit complete interrupt for the
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last packet transmitted.
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The device has been reset.
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.It "fxp0: can't load rx buffer, error = %d"
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The driver was unable to load the DMA map for a receive buffer, and
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has reported the errno value.
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This error is currently fatal, and will
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panic the system.
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.It "fxp0: fxp_mdi_read: timed out"
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The MDIO failed to become ready during an MII read operation.
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.It "fxp0: fxp_mdi_write: timed out"
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The MDIO failed to become ready during an MII write operation.
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.It "fxp0: May need receiver lock-up workaround"
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The interface may need to be periodically reset to workaround a receiver
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lock-up bug.
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.El
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.Sh SEE ALSO
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.Xr cardbus 4 ,
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.Xr ifmedia 4 ,
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.Xr intro 4 ,
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.Xr mii 4 ,
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.Xr pci 4 ,
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.Xr ifconfig 8
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