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+.\"	$NetBSD: jme.4,v 1.8 2019/10/30 12:06:25 msaitoh Exp $
+.\"
+.\" Copyright (c) 2008 Manuel Bouyer
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd October 30, 2019
+.Dt JME 4
+.Os
+.Sh NAME
+.Nm jme
+.Nd JMicron Technologies JMC250 Gigabit Ethernet and JMC260 Fast Ethernet controller driver
+.Sh SYNOPSIS
+.Cd "jme* at pci? dev ? function ?"
+.Pp
+Configuration of PHYs is necessary.
+See
+.Xr mii 4 .
+.Sh DESCRIPTION
+The
+.Nm jme
+device driver supports network adapters based on the JMicron
+Technologies JMC250 Gigabit Ethernet and JMC260 Fast Ethernet chips.
+The following features are supported:
+.Bd -literal -offset indent
+IPv4 transmit/receive IP/TCP/UDP checksum offload
+IPv6 transmit TCP/UDP checksum offload
+IPv4 and IPv6 TCP segmentation offload
+VLAN tag insertion/removal
+Interrupt coalescing
+10/100/1000Mbps operation in full-duplex mode
+10/100Mbps operation in half-duplex mode
+Jumbo frames (up to 9022 bytes)
+.Ed
+.Pp
+Due to hardware limitation checksums and TCP segmentation offload can't
+be enabled if the configured MTU is larger than 4000 bytes.
+.Pp
+Interrupt coalescing can be controlled on a per-adapter basis through
+the following sysctls:
+.Bl -tag -width ".Cm hw.jme.jmeXxX.int_rxtos"
+.It Cm hw.jme.jme<x>.int_rxtos
+jme receive interrupt moderation timer, in microseconds (defaults to 100)
+.It Cm hw.jme.jme<x>.int_rxct
+jme receive interrupt moderation packet counter (defaults to 128)
+.It Cm hw.jme.jme<x>.int_txto
+jme transmit interrupt moderation timer, in microseconds (defaults to 100)
+.It Cm hw.jme.jme<x>.int_txct
+jme transmit interrupt moderation packet counter (defaults to 128)
+.El
+.Sh SEE ALSO
+.Xr ifmedia 4 ,
+.Xr jmphy 4 ,
+.Xr mii 4 ,
+.Xr netintro 4 ,
+.Xr pci 4 ,
+.Xr ifconfig 8
+.Sh HISTORY
+The
+.Nm
+device driver first appeared in
+.Nx 5.0 .
+.Sh BUGS
+Hardware bugs prevent support of IPv6 receive TCP/UDP checksum offload
+in the JMC250 rev A2, and is disabled in the driver.
+This should be revisited when a newer hardware revision is available.