1.\" $NetBSD: jme.4,v 1.6 2009/10/19 18:41:09 bouyer Exp $ 2.\" 3.\" Copyright (c) 2008 Manuel Bouyer 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" 26.Dd October 17, 2008 27.Dt JME 4 28.Os 29.Sh NAME 30.Nm jme 31.Nd JMicron Technologies JMC250 Gigabit Ethernet and JMC260 Fast Ethernet controller driver 32.Sh SYNOPSIS 33.Cd "jme* at pci? dev ? function ?" 34.Pp 35Configuration of PHYs is necessary. 36See 37.Xr mii 4 . 38.Sh DESCRIPTION 39The 40.Nm jme 41device driver supports network adapters based on the JMicron 42Technologies JMC250 Gigabit Ethernet and JMC260 Fast Ethernet chips. 43The following features are supported: 44.Bd -literal -offset indent 45IPv4 transmit/receive IP/TCP/UDP checksum offload 46IPv6 transmit TCP/UDP checksum offload 47IPv4 and IPv6 TCP segmentation offload 48VLAN tag insertion/removal 49Interrupt coalescing 5010/100/1000Mbps operation in full-duplex mode 5110/100Mbps operation in half-duplex mode 52Jumbo frames (up to 9022 bytes) 53.Ed 54.Pp 55Due to hardware limitation checksums and TCP segmentation offload can't 56be enabled if the configured MTU is larger than 4000 bytes. 57.Pp 58Interrupt coalescing can be controlled on a per-adapter basis through 59the following sysctls: 60.Bl -tag -width ".Cm hw.jme.jmeXxX.int_rxtos" 61.It Cm hw.jme.jme\*[Lt]x\*[Gt].int_rxtos 62jme receive interrupt moderation timer, in microseconds (defaults to 100) 63.It Cm hw.jme.jme\*[Lt]x\*[Gt].int_rxct 64jme receive interrupt moderation packet counter (defaults to 128) 65.It Cm hw.jme.jme\*[Lt]x\*[Gt].int_txto 66jme transmit interrupt moderation timer, in microseconds (defaults to 100) 67.It Cm hw.jme.jme\*[Lt]x\*[Gt].int_txct 68jme transmit interrupt moderation packet counter (defaults to 128) 69.El 70.Sh SEE ALSO 71.Xr ifmedia 4 , 72.Xr mii 4 , 73.Xr netintro 4 , 74.Xr pci 4 , 75.Xr ifconfig 8 76.Sh HISTORY 77The 78.Nm 79device driver first appeared in 80.Nx 5.0 . 81.Sh BUGS 82Hardware bugs prevent support of IPv6 receive TCP/UDP checksum offload 83in the JMC250 rev A2, and is disabled in the driver. 84This should be revisited when a newer hardware revision is available. 85