198 lines
6.7 KiB
Groff
198 lines
6.7 KiB
Groff
.\" Copyright (c) 2008 Pyun YongHyeon
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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
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" 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 AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT 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 March 4, 2012
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.Dt JME 4
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.Os
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.Sh NAME
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.Nm jme
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.Nd JMicron Gigabit/Fast 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 jme"
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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_jme_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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device driver provides support for JMicron JMC25x PCI Express
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Gigabit Ethernet controllers and JMicron JMC26x PCI Express Fast
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Ethernet controllers.
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.Pp
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All LOMs supported by the
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.Nm
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driver have TCP/UDP/IP checksum offload for both transmit and receive,
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TCP segmentation offload (TSO), hardware VLAN tag stripping/insertion
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features, Wake On Lan (WOL) and an interrupt coalescing/moderation
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mechanism as well as a 64-bit multicast hash filter.
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.Pp
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The JMC25x also supports Jumbo Frames (up to 9216 bytes), which can be
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configured 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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.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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.Bl -tag -width ".Cm 10baseT/UTP"
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.It Cm autoselect
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Enable autoselection of the media type and options.
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The user can manually override
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the autoselected mode by adding media options to
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.Xr rc.conf 5 .
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.It Cm 10baseT/UTP
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Set 10Mbps operation.
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.It Cm 100baseTX
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Set 100Mbps (Fast Ethernet) operation.
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.It Cm 1000baseTX
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Set 1000baseTX operation over twisted pair.
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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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Force full duplex operation.
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.It Cm half-duplex
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Force half duplex operation.
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.El
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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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device driver provides support for the following Ethernet controllers:
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.Pp
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.Bl -bullet -compact
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.It
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JMicron JMC250 PCI Express Gigabit Ethernet controller
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.It
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JMicron JMC251 PCI Express Gigabit Ethernet with Card Read Host controller
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.It
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JMicron JMC260 PCI Express Fast Ethernet controller
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.It
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JMicron JMC261 PCI Express Gigabit Ethernet with Card Read Host controller
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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 "xxxxxx"
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.It Va hw.jme.msi_disable
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This tunable disables MSI support on the Ethernet hardware.
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The default value is 0.
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.It Va hw.jme.msix_disable
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This tunable disables MSI-X support on the Ethernet hardware.
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The default value is 0.
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.El
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.Sh SYSCTL VARIABLES
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The following variables are available as both
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.Xr sysctl 8
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variables and
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.Xr loader 8
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tunables:
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.Bl -tag -width "xxxxxx"
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.It Va dev.jme.%d.tx_coal_to
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This variable sets the maximum amount of time to delay
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before sending a Tx completion interrupt, in microseconds.
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The accepted range is 1 to 65535; the default is 100 (100us).
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.It Va dev.jme.%d.tx_coal_pkt
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This variable sets the maximum number of outgoing packets which may be
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coalesced together into a single Tx completion interrupt.
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The accepted range is 1 to 255; the default is 8.
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.It Va dev.jme.%d.rx_coal_to
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This variable sets the maximum amount of time to wait for
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additional packets to arrive (for possible packet coalescing)
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before firing an Rx completion interrupt, in microseconds.
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The accepted range is 1 to 65535; the default is 100 (100us).
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.It Va dev.jme.%d.rx_coal_pkt
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This variable sets the maximum number of incoming packets which may be
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coalesced into a single Rx completion interrupt.
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The accepted range is 1 to 255; the default is 2.
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.It Va dev.jme.%d.process_limit
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This variable sets the maximum number of events that will be processed
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in a single batch before the handler is requeued into a taskqueue.
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The accepted range is 10 to 255; the default value is 128 events.
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The interface does not need to be brought down and up again before
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a change takes effect.
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.El
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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 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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driver was written by
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.An Pyun YongHyeon
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.Aq yongari@FreeBSD.org .
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It first appeared in
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.Fx 7.1 .
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.Sh CAVEATS
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The
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.Nm
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driver tries to avoid unnecessary station address reprogramming for
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controllers that use eFuse to store station address.
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The number of times that eFuse can be safely reprogrammed is 16 at
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most.
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In addition, there is no way to restore the factory default station
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address once the station address has been reprogrammed via eFuse.
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It is highly recommended not to reprogram the station address and
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it is the responsibility of the administrator to store the original station
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address in a safe place when station address is changed.
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.Pp
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There are two known 1000baseT link establishment issues with JMC25x.
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If the full mask revision number of JMC25x controller is less than
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or equal to 4 and the link partner enabled the IEEE 802.3az Energy Efficient
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Ethernet feature, the controller will not be able to establish a
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1000baseT link.
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Also, if the length of the cable is longer than 120 meters, the controller
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can not establish a 1000baseT link.
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The known workaround for these issues is to force manual link
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configuration with 100baseTX instead of relying on auto-negotiation.
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The full mask revision number of controller can be checked with the
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verbose kernel boot option.
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Use the lower nibble of the chip revision number to get the
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full mask revision of the controller.
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