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.\" $DragonFly: src/share/man/man4/jme.4,v 1.3 2008/07/27 19:38:58 swildner Exp $ 27.\" 28.Dd July 26, 2008 29.Dt JME 4 30.Os 31.Sh NAME 32.Nm jme 33.Nd JMicron Gigabit/Fast Ethernet driver 34.Sh SYNOPSIS 35To compile this driver into the kernel, 36place the following lines in your 37kernel configuration file: 38.Bd -ragged -offset indent 39.Cd "device miibus" 40.Cd "device jme" 41.Ed 42.Pp 43Alternatively, to load the driver as a 44module at boot time, place the following line in 45.Xr loader.conf 5 : 46.Bd -literal -offset indent 47if_jme_load="YES" 48.Ed 49.Sh DESCRIPTION 50The 51.Nm 52device driver provides support for JMicron JMC250 PCI Express 53Gigabit Ethernet controllers and JMicron JMC260 PCI Express Fast 54Ethernet controllers. 55.Pp 56All LOMs supported by the 57.Nm 58driver have TCP/UDP/IP checksum offload for both transmit and receive, 59.\" TCP segmentation offload (TSO), 60hardware VLAN tag stripping/insertion features, 61.\" Wake On Lan (WOL) 62an interrupt coalescing/moderation mechanism as well as 63a 64-bit multicast hash filter. 64.Pp 65The JMC250 also supports Jumbo Frames (up to 9216 bytes), which can be 66configured via the interface MTU setting. 67Selecting an MTU larger than 1500 bytes with the 68.Xr ifconfig 8 69utility configures the adapter to receive and transmit Jumbo Frames. 70.Pp 71The 72.Nm 73driver supports the following media types: 74.Bl -tag -width ".Cm 10baseT/UTP" 75.It Cm autoselect 76Enable autoselection of the media type and options. 77The user can manually override 78the autoselected mode by adding media options to 79.Xr rc.conf 5 . 80.It Cm 10baseT/UTP 81Set 10Mbps operation. 82.It Cm 100baseTX 83Set 100Mbps (Fast Ethernet) operation. 84.It Cm 1000baseT 85Set 1000baseT operation over twisted pair. 86.El 87.Pp 88The 89.Nm 90driver supports the following media options: 91.Bl -tag -width ".Cm full-duplex" 92.It Cm full-duplex 93Force full duplex operation. 94.It Cm half-duplex 95Force half duplex operation. 96.El 97.Pp 98For more information on configuring this device, see 99.Xr ifconfig 8 . 100The 101.Nm 102driver supports 103.Xr polling 4 . 104.Ss MIB Variables 105A number of per-interface variables are implemented in the 106.Va hw.jme Ns Em X 107branch of the 108.Xr sysctl 3 109MIB. 110.Bl -tag -width "rx_ring_count" 111.It Va tx_coal_to 112Maximum amount of time to delay for TX completion interrupt in 113units of 1us. 114The accepted range is 1 to 65535, the default is 65535 (65535us). 115.It Va tx_coal_pkt 116Maximum number of packets to fire TX completion interrupt. 117The accepted range is 0 to 255, the default is 64. 118Packet count based TX interrupt coalescing could be disabled 119by setting this variable to 0. 120.It Va rx_coal_to 121Maximum amount of time to delay for RX completion interrupt in 122units of 1us. 123The accepted range is 1 to 65535, the default is 100 (100us). 124.It Va rx_coal_pkt 125Maximum number of packets to fire RX completion interrupt. 126The accepted range is 0 to 255, the default is 64. 127Packet count based RX interrupt coalescing could be disabled 128by setting this variable to 0. 129.It Va rx_desc_count 130Number of RX descriptors per-ring (read-only). 131Use tunable hw.jme.rx_desc_count to configure it. 132.It Va tx_desc_count 133Number of TX descriptors (read-only). 134Use tunable hw.jme.tx_desc_count to configure it. 135.It Va rx_ring_count 136Number of RX rings (read-only). 137Use tunable hw.jme.rx_ring_count to configure it. 138.It Va rx_ring_inuse 139Number of RX rings being used (read-only). 140.El 141.Sh SEE ALSO 142.Xr altq 4 , 143.Xr arp 4 , 144.Xr ifmedia 4 , 145.Xr miibus 4 , 146.Xr netintro 4 , 147.Xr ng_ether 4 , 148.Xr polling 4 , 149.Xr vlan 4 , 150.Xr ifconfig 8 151.Sh HISTORY 152The 153.Nm 154driver was written by 155.An Pyun YongHyeon 156.Aq yongari@FreeBSD.org . 157It first appeared in 158.Fx 7.1 159and was imported into 160.Dx 2.1 . 161