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EM(4) FreeBSD Kernel Interfaces Manual EM(4) NAME em -- Intel(R) PRO/1000 gigabit ethernet driver for the FreeBSD operating system SYNOPSIS device em DESCRIPTION The em driver provides support for PCI gigabit ethernet adapters based on the Intel 82542, 82543 and 82544 ethernet controller chip. The driver supports Transmit/Receive checksum offload and jumbo frames only on 82543 and 82544-based adapters. For a list of supported adapters, see the README included with the driver. For questions related to hardware requirements, refer to the documenta- tion supplied with your Intel PRO/1000 adapter. All hardware require- ments listed apply to use with FreeBSD. Support for jumbo frames is provided via the interface MTU setting. Selecting an MTU larger than 1500 bytes with the ifconfig(8) utility con- figures the adapter to receive and transmit jumbo frames. The maximum MTU size for jumbo frames is 9000. The em driver supports the following media types: autoselect Enables auto-negotiation for speed and duplex. 10baseT/UTP Sets 10Mbps operation. The mediaopt option can also be used to select either full-duplex or half-duplex modes. 100baseTX Sets 100Mbps operation. The mediaopt option can also be used to select either full-duplex or half-duplex modes. 1000baseSX Sets 1000Mbps operation. Only full-duplex mode is supported at this speed. 1000baseTX Sets 1000Mbps operation. Only full-duplex mode is supported at this speed. The em driver supports the following media options: full-duplex Forces full duplex operation half-duplex Forces half duplex operation. For more information on configuring this device, see ifconfig(8). DIAGNOSTICS em%d: Unable to allocate bus resource: memory A fatal initialization error has occurred. em%d: Unable to allocate bus resource: interrupt A fatal initialization error has occurred. em%d: No memory for jumbo buffers! The driver failed to allocate memory for jumbo frames during initialization. em%d: watchdog timeout -- resetting The device has stopped responding to the network, or there is a problem with the network connection (cable). SUPPORT For additional information regarding building and installation, see the README included with the driver. For general information and support, go to the Intel support Website at http://support.intel.com. If an issue is identified with the released source code on the supported kernel with a supported adapter, email the specific information related to the issue to <freebsdnic@mailbox.intel.com>. SEE ALSO arp(4), netintro(4), ng_ether(4), vlan(4), ifconfig(8) HISTORY The em device driver first appeared in FreeBSD 4.5. AUTHORS The em driver was written by Intel Corporation <freebsdnic@mailbox.intel.com>. FreeBSD 11.1 December 8, 2001 FreeBSD 11.1
NAME | SYNOPSIS | DESCRIPTION | DIAGNOSTICS | SUPPORT | SEE ALSO | HISTORY | AUTHORS
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