RE(4)							   BSD Kernel Interfaces Manual 						     RE(4)

NAME

     re -- RealTek 8139C+/8169/8169S/8110S PCI Ethernet adapter driver

SYNOPSIS

     re* at pci? dev ? function ?
     re* at cardbus? function ?

DESCRIPTION

     The re driver provides support for various NICs based on the RealTek RTL8139C+, RTL8169, RTL8169S, and RTL8110S PCI/Cardbus Ethernet con-
     trollers, including the following:

     o	 Alloy Computer Products EtherGOLD 1439E 10/100 (8139C+)
     o	 Compaq Evo N1015v Integrated Ethernet (8139C+)
     o	 Gigabyte 7N400 Pro2 Integrated Gigabit Ethernet (8110S)
     o	 NETGEAR GA311 (8169S)
     o	 PLANEX COMMUNICATIONS Inc. GN-1200TC (8169S)
     o	 Xterasys XN-152 10/100/1000 NIC (8169)
     o	 Corega CG-LAPCIGT Gigabit Ethernet (8169S)
     o	 D-Link DGE-528T Gigabit Ethernet (8169S)
     o	 US Robotics (3Com) USR997902 Gigabit Ethernet (8169S)
     o	 Linksys EG1032 rev. 3 Gigabit Ethernet (8169S)

     NICs based on the 8139C+ are capable of 10 and 100Mbps speeds over CAT5 cable.  NICs based on the 8169, 8169S, and 8110S are capable of 10,
     100, and 1000Mbps operation.

     All NICs supported by the re driver have TCP/IP checksum offload and hardware VLAN tagging/insertion features, and use a descriptor-based DMA
     mechanism.  They are also capable of TCP large send (TCP segmentation offload).

     The 8139C+ is a single-chip solution combining both a 10/100 MAC and PHY, and its PHY is supported by rlphy(4).  The 8169 is a 10/100/1000
     MAC only, requiring a GMII or TBI external PHY and some 8169 based boards have Marvell 88E1000 PHY supported by makphy(4).  The 8169S and
     8110S are single-chip devices containing both a 10/100/1000 MAC and 10/100/1000 copper PHY, which is supported by rgephy(4).  Standalone
     10/100/1000 cards are available in both 32-bit PCI and 64-bit PCI models.	The 8110S is designed for embedded LAN-on-motherboard applica-
     tions.

     The 8169, 8169S, and 8110S also support jumbo frames, which can be configured via the interface MTU setting.  Selecting an MTU larger than
     1500 bytes with the ifconfig(8) utility configures the adapter to receive and transmit jumbo frames.

     The re driver supports the following media types:

     autoselect   Enable autoselection of the media type and options.  The user can manually override the autoselected mode by adding media
		  options to rc.conf(5).

     10baseT/UTP  Set 10Mbps operation.  The ifconfig(8) mediaopt option can also be used to select either full-duplex or half-duplex modes.

     100baseTX	  Set 100Mbps (Fast Ethernet) operation.  The ifconfig(8) mediaopt option can also be used to select either full-duplex or
		  half-duplex modes.

     1000baseTX   Set 1000baseTX operation over twisted pair.  The RealTek GigE chips support 1000Mbps in full-duplex mode only.

     The re driver supports the following media options:

     full-duplex  Force full duplex operation.

     half-duplex  Force half duplex operation.

     For more information on configuring this device, see ifconfig(8).

DIAGNOSTICS

     re%d: can't map i/o space	A fatal initialization error has occurred.

     re%d: can't map mem space	A fatal initialization error has occurred.

     re%d: couldn't map interrupt  A fatal initialization error has occurred.

     re%d: watchdog timeout  The device has stopped responding to the network, or there is a problem with the network connection (cable).

SEE ALSO

     arp(4), cardbus(4), mii(4), netintro(4), pci(4), rgephy(4), rlphy(4), ifconfig(8)

     RealTek Semiconductor RTL8139C+, RTL8169, RTL8169S, and RTL8110S datasheets, http://www.realtek.com.tw.

HISTORY

     The re device driver first appeared in FreeBSD 5.2 and was ported to NetBSD 2.0.

AUTHORS

     The re driver was written by Bill Paul <wpaul@windriver.com>.

BUGS

     The Xterasys XN-152 32-bit PCI NIC, which uses the RTL8169 MAC and Marvell 88E1000 PHY, has a defect that causes DMA corruption if the board
     is plugged into a 64-bit PCI slot.  The defect lies in the board design, not the chip itself: the PCI REQ64# and ACK64# lines should be
     pulled high, but they are not.  The result is that the 8169 chip is tricked into performing 64-bit DMA transfers even though a 64-bit data
     path between the NIC and the bus does not actually exist.

     Unfortunately, it is not possible to correct this problem in software, however it is possible to detect it.  When the re driver is loaded, it
     will run a diagnostic routine designed to validate DMA operation by placing the chip in digital loopback mode and initiating a packet trans-
     mission.  If the card functions properly, the transmitted data will be echoed back unmodified.  If the echoed data is corrupt, the driver
     will print an error message on the console and abort the device attach.  The user should ensure the NIC is installed in a 32-bit PCI slot to
     avoid this problem.

     The RealTek 8169, 8169S, and 8110S chips appear to only be capable of transmitting jumbo frames up to 7.5K in size.

BSD
								  January 8, 2007							       BSD