1.\" Copyright (c) 2001-2003, Intel Corporation 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 are met: 6.\" 7.\" 1. Redistributions of source code must retain the above copyright notice, 8.\" this list of conditions and the following disclaimer. 9.\" 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" 3. Neither the name of the Intel Corporation nor the names of its 15.\" contributors may be used to endorse or promote products derived from 16.\" this software without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19.\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\" POSSIBILITY OF SUCH DAMAGE. 29.\" 30.\" * Other names and brands may be claimed as the property of others. 31.\" 32.\" $FreeBSD$ 33.\" 34.Dd October 6, 2008 35.Dt EM 4 36.Os 37.Sh NAME 38.Nm em 39.Nd "Intel(R) PRO/1000 Gigabit Ethernet adapter driver" 40.Sh SYNOPSIS 41To compile this driver into the kernel, 42place the following line in your 43kernel configuration file: 44.Bd -ragged -offset indent 45.Cd "device em" 46.Ed 47.Pp 48Alternatively, to load the driver as a 49module at boot time, place the following line in 50.Xr loader.conf 5 : 51.Bd -literal -offset indent 52if_em_load="YES" 53.Ed 54.Sh DESCRIPTION 55The 56.Nm 57driver provides support for PCI Gigabit Ethernet adapters based on 58the Intel 82540, 82541ER, 82541PI, 82542, 82543, 82544, 82545, 82546, 5982546EB, 82546GB, 82547, 82571, 81572, 82573, and 82574 Ethernet 60controller chips. 61The driver supports Transmit/Receive checksum offload 62and Jumbo Frames on all but 82542-based adapters. 63Furthermore it supports TCP segmentation offload (TSO) on all adapters but 64those based on the 82543, 82544 and 82547 controller chips. 65For further hardware information, see the 66.Pa README 67included with the driver. 68.Pp 69For questions related to hardware requirements, 70refer to the documentation supplied with your Intel PRO/1000 adapter. 71All hardware requirements listed apply to use with 72.Fx . 73.Pp 74Support for Jumbo Frames is provided via the interface MTU setting. 75Selecting an MTU larger than 1500 bytes with the 76.Xr ifconfig 8 77utility configures the adapter to receive and transmit Jumbo Frames. 78The maximum MTU size for Jumbo Frames is 16114. 79.Pp 80This driver version supports VLANs. 81The 82.Nm 83driver supports the following media types: 84.Bl -tag -width ".Cm 10baseT/UTP" 85.It Cm autoselect 86Enables auto-negotiation for speed and duplex. 87.It Cm 10baseT/UTP 88Sets 10Mbps operation. 89Use the 90.Cm mediaopt 91option to select 92.Cm full-duplex 93mode. 94.It Cm 100baseTX 95Sets 100Mbps operation. 96Use the 97.Cm mediaopt 98option to select 99.Cm full-duplex 100mode. 101.It Cm 1000baseSX 102Sets 1000Mbps operation. 103Only 104.Cm full-duplex 105mode is supported at this speed. 106.It Cm 1000baseTX 107Sets 1000Mbps operation. 108Only 109.Cm full-duplex 110mode is supported at this speed. 111.El 112.Pp 113The 114.Nm 115driver supports the following media options: 116.Bl -tag -width ".Cm full-duplex" 117.It Cm full-duplex 118Forces full-duplex operation 119.It Cm half-duplex 120Forces half-duplex operation. 121.El 122.Pp 123Only use 124.Cm mediaopt 125to set the driver to 126.Cm full-duplex . 127If 128.Cm mediaopt 129is not specified, the driver defaults to 130.Cm half-duplex . 131.Pp 132For more information on configuring this device, see 133.Xr ifconfig 8 . 134.Sh HARDWARE 135The 136.Nm 137driver supports Gigabit Ethernet adapters based on the Intel 13882540, 82541ER, 82541PI, 82542, 82543, 82544, 82545, 82546, 82546EB, 13982546GB, 82547, 82571, 82572, 82573, and 82574 controller chips: 140.Pp 141.Bl -bullet -compact 142.It 143Intel PRO/1000 CT Network Connection (82547) 144.It 145Intel PRO/1000 F Server Adapter (82543) 146.It 147Intel PRO/1000 Gigabit Server Adapter (82542) 148.It 149Intel PRO/1000 GT Desktop Adapter (82541PI) 150.It 151Intel PRO/1000 MF Dual Port Server Adapter (82546) 152.It 153Intel PRO/1000 MF Server Adapter (82545) 154.It 155Intel PRO/1000 MF Server Adapter (LX) (82545) 156.It 157Intel PRO/1000 MT Desktop Adapter (82540) 158.It 159Intel PRO/1000 MT Desktop Adapter (82541) 160.It 161Intel PRO/1000 MT Dual Port Server Adapter (82546) 162.It 163Intel PRO/1000 MT Quad Port Server Adapter (82546EB) 164.It 165Intel PRO/1000 MT Server Adapter (82545) 166.It 167Intel PRO/1000 PF Dual Port Server Adapter (82571) 168.It 169Intel PRO/1000 PF Quad Port Server Adapter (82571) 170.It 171Intel PRO/1000 PF Server Adapter (82572) 172.It 173Intel PRO/1000 PT Desktop Adapter (82572) 174.It 175Intel PRO/1000 PT Dual Port Server Adapter (82571) 176.It 177Intel PRO/1000 PT Quad Port Server Adapter (82571) 178.It 179Intel PRO/1000 PT Server Adapter (82572) 180.It 181Intel PRO/1000 T Desktop Adapter (82544) 182.It 183Intel PRO/1000 T Server Adapter (82543) 184.It 185Intel PRO/1000 XF Server Adapter (82544) 186.It 187Intel PRO/1000 XT Server Adapter (82544) 188.El 189.Sh LOADER TUNABLES 190Tunables can be set at the 191.Xr loader 8 192prompt before booting the kernel or stored in 193.Xr loader.conf 5 . 194.Bl -tag -width indent 195.It Va hw.em.rxd 196Number of receive descriptors allocated by the driver. 197The default value is 256. 198The 82542 and 82543-based adapters can handle up to 256 descriptors, 199while others can have up to 4096. 200.It Va hw.em.txd 201Number of transmit descriptors allocated by the driver. 202The default value is 256. 203The 82542 and 82543-based adapters can handle up to 256 descriptors, 204while others can have up to 4096. 205.It Va hw.em.rx_int_delay 206This value delays the generation of receive interrupts in units of 2071.024 microseconds. 208The default value is 0, since adapters may hang with this feature 209being enabled. 210.It Va hw.em.rx_abs_int_delay 211If 212.Va hw.em.rx_int_delay 213is non-zero, this tunable limits the maximum delay in which a receive 214interrupt is generated. 215.It Va hw.em.tx_int_delay 216This value delays the generation of transmit interrupts in units of 2171.024 microseconds. 218The default value is 64. 219.It Va hw.em.tx_abs_int_delay 220If 221.Va hw.em.tx_int_delay 222is non-zero, this tunable limits the maximum delay in which a transmit 223interrupt is generated. 224.El 225.Sh DIAGNOSTICS 226.Bl -diag 227.It "em%d: Unable to allocate bus resource: memory" 228A fatal initialization error has occurred. 229.It "em%d: Unable to allocate bus resource: interrupt" 230A fatal initialization error has occurred. 231.It "em%d: watchdog timeout -- resetting" 232The device has stopped responding to the network, or there is a problem with 233the network connection (cable). 234.El 235.Sh SUPPORT 236For general information and support, 237go to the Intel support website at: 238.Pa http://support.intel.com . 239.Pp 240If an issue is identified with the released source code on the supported kernel 241with a supported adapter, email the specific information related to the 242issue to 243.Aq freebsdnic@mailbox.intel.com . 244.Sh SEE ALSO 245.Xr altq 4 , 246.Xr arp 4 , 247.Xr igb 4 , 248.Xr netintro 4 , 249.Xr ng_ether 4 , 250.Xr polling 4 , 251.Xr vlan 4 , 252.Xr ifconfig 8 253.Sh HISTORY 254The 255.Nm 256device driver first appeared in 257.Fx 4.4 . 258.Sh AUTHORS 259The 260.Nm 261driver was written by 262.An Intel Corporation Aq freebsdnic@mailbox.intel.com . 263.Sh BUGS 264Hardware-assisted VLAN processing is disabled by default. 265You can enable it on an 266.Nm 267interface using 268.Xr ifconfig 8 . 269