1.\" Copyright (c) 2008 Pyun YongHyeon 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD: src/share/man/man4/jme.4,v 1.1 2008/05/27 01:59:17 yongari Exp $ 26.\" 27.Dd April 7, 2012 28.Dt JME 4 29.Os 30.Sh NAME 31.Nm jme 32.Nd JMicron Gigabit/Fast Ethernet driver 33.Sh SYNOPSIS 34To compile this driver into the kernel, 35place the following lines in your 36kernel configuration file: 37.Bd -ragged -offset indent 38.Cd "device miibus" 39.Cd "device jme" 40.Ed 41.Pp 42Alternatively, to load the driver as a 43module at boot time, place the following line in 44.Xr loader.conf 5 : 45.Bd -literal -offset indent 46if_jme_load="YES" 47.Ed 48.Sh DESCRIPTION 49The 50.Nm 51device driver provides support for JMicron JMC250 PCI Express 52Gigabit Ethernet controllers and JMicron JMC260 PCI Express Fast 53Ethernet controllers. 54.Pp 55All LOMs supported by the 56.Nm 57driver have TCP/UDP/IP checksum offload for both transmit and receive, 58.\" TCP segmentation offload (TSO), 59hardware VLAN tag stripping/insertion features, 60.\" Wake On Lan (WOL) 61an interrupt coalescing/moderation mechanism as well as 62a 64-bit multicast hash filter. 63.Pp 64The JMC250 also supports Jumbo Frames (up to 9216 bytes), which can be 65configured via the interface MTU setting. 66Selecting an MTU larger than 1500 bytes with the 67.Xr ifconfig 8 68utility configures the adapter to receive and transmit Jumbo Frames. 69.Pp 70The 71.Nm 72driver supports the following media types: 73.Bl -tag -width ".Cm 10baseT/UTP" 74.It Cm autoselect 75Enable autoselection of the media type and options. 76The user can manually override 77the autoselected mode by adding media options to 78.Xr rc.conf 5 . 79.It Cm 10baseT/UTP 80Set 10Mbps operation. 81.It Cm 100baseTX 82Set 100Mbps (Fast Ethernet) operation. 83.It Cm 1000baseT 84Set 1000baseT operation over twisted pair. 85.El 86.Pp 87The 88.Nm 89driver supports the following media options: 90.Bl -tag -width ".Cm full-duplex" 91.It Cm full-duplex 92Force full duplex operation. 93.It Cm half-duplex 94Force half duplex operation. 95.El 96.Pp 97For more information on configuring this device, see 98.Xr ifconfig 8 . 99The 100.Nm 101driver supports 102.Xr polling 4 . 103.Ss Loader Tunables 104By default, the driver will use MSI if it is supported. 105This behavior can be turned off by setting the following tunable: 106.Bd -literal -offset indent 107hw.jme.msi.enable=0 108.Ed 109.Ss MIB Variables 110A number of per-interface variables are implemented in the 111.Va hw.jme Ns Em X 112branch of the 113.Xr sysctl 3 114MIB. 115.Bl -tag -width "rx_ring_count" 116.It Va tx_coal_to 117Maximum amount of time to delay for TX completion interrupt in 118units of 1us. 119The accepted range is 1 to 65535, the default is 65535 (65535us). 120.It Va tx_coal_pkt 121Maximum number of packets to fire TX completion interrupt. 122The accepted range is 0 to 255, the default is 64. 123Packet count based TX interrupt coalescing could be disabled 124by setting this variable to 0. 125.It Va rx_coal_to 126Maximum amount of time to delay for RX completion interrupt in 127units of 1us. 128The accepted range is 1 to 65535, the default is 100 (100us). 129.It Va rx_coal_pkt 130Maximum number of packets to fire RX completion interrupt. 131The accepted range is 0 to 255, the default is 64. 132Packet count based RX interrupt coalescing could be disabled 133by setting this variable to 0. 134.It Va rx_desc_count 135Number of RX descriptors per-ring (read-only). 136Use the tunable 137.Va hw.jme.rx_desc_count 138to configure it. 139.It Va tx_desc_count 140Number of TX descriptors (read-only). 141Use the tunable 142.Va hw.jme.tx_desc_count 143to configure it. 144.It Va rx_ring_count 145Number of RX rings (read-only). 146Use the tunable 147.Va hw.jme.rx_ring_count 148to configure it. 149.It Va rx_ring_inuse 150Number of RX rings being used (read-only). 151.El 152.Sh SEE ALSO 153.Xr altq 4 , 154.Xr arp 4 , 155.Xr ifmedia 4 , 156.Xr miibus 4 , 157.Xr netintro 4 , 158.Xr ng_ether 4 , 159.Xr polling 4 , 160.Xr vlan 4 , 161.Xr ifconfig 8 162.Sh HISTORY 163The 164.Nm 165driver was written by 166.An Pyun YongHyeon 167.Aq yongari@FreeBSD.org . 168It first appeared in 169.Fx 7.1 170and was imported into 171.Dx 2.1 . 172