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RE(4)		       FreeBSD Kernel Interfaces Manual			 RE(4)

NAME
     re	-- RealTek 8139C+/8169/816xS/811xS/8168/810xE/8111 PCI/PCIe Ethernet
     adapter driver

SYNOPSIS
     To	compile	this driver into the kernel, place the following lines in your
     kernel configuration file:

	   device miibus
	   device re

     Alternatively, to load the	driver as a module at boot time, place the
     following line in loader.conf(5):

	   if_re_load="YES"

DESCRIPTION
     The re driver provides support for	various	NICs based on the RealTek
     RTL8139C+,	RTL8169, RTL816xS, RTL811xS, RTL8168, RTL810xE and RTL8111 PCI
     and PCIe Ethernet controllers.

     NICs based	on the 8139C+ and 810xE	are capable of 10 and 100Mbps speeds
     over CAT5 cable.  NICs based on the 8169, 816xS, 811xS, 8168 and 8111 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.
     The 8169 is a 10/100/1000 MAC only, requiring a GMII or TBI external PHY.
     The 816xS,	811xS, 8168 and	8111 are single-chip devices containing	both a
     10/100/1000 MAC and 10/100/1000 copper PHY.  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 applications.

     The 8169, 8169S and 8110S also support jumbo frames, which	can be config-
     ured via the interface MTU	setting.  The MTU is limited to	7422, since
     the chip cannot transmit larger frames.  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).

HARDWARE
     The re driver supports RealTek RTL8139C+, RTL8169,	RTL816xS, RTL811xS,
     RTL8168, RTL810xE and RTL8111 based Fast Ethernet and Gigabit Ethernet
     adapters including:

     +o	 Alloy Computer	Products EtherGOLD 1439E 10/100	(8139C+)
     +o	 Compaq	Evo N1015v Integrated Ethernet (8139C+)
     +o	 Corega	CG-LAPCIGT Gigabit Ethernet (8169S)
     +o	 D-Link	DGE-528(T) Gigabit Ethernet (8169S)
     +o	 Gigabyte 7N400	Pro2 Integrated	Gigabit	Ethernet (8110S)
     +o	 LevelOne GNC-0105T (8169S)
     +o	 LinkSys EG1032	(32-bit	PCI)
     +o	 PLANEX	COMMUNICATIONS Inc. GN-1200TC (8169S)
     +o	 USRobotics USR997902 Gigabit Ethernet (8169S)
     +o	 Xterasys XN-152 10/100/1000 NIC (8169)

LOADER TUNABLES
     Tunables can be set at the	loader(8) prompt before	booting	the kernel or
     stored in loader.conf(5).

     hw.re.intr_filter
	     This tunable makes	driver use interrupt filter handler on con-
	     trollers that support MSI/MSI-X capability.  If MSI/MSI-X is dis-
	     abled by administrator this tunable has no	effect and driver will
	     use interrupt filter handler.  The	default	value is 0 to use
	     interrupt thread handler.

     hw.re.msi_disable
	     This tunable disables MSI support on the Ethernet hardware.  The
	     default value is 0.

     hw.re.msix_disable
	     This tunable disables MSI-X support on the	Ethernet hardware.
	     The default value is 0.

     hw.re.prefer_iomap
	     This tunable controls which register mapping should be used on
	     the specified device.  A non-zero value enables I/O space regis-
	     ter mapping.  The default value is	0 to use memory	space register
	     mapping.

SYSCTL VARIABLES
     The following variables are available as both sysctl(8) variables and
     loader(8) tunables:

     dev.re.%d.int_rx_mod
	     Maximum amount of time to delay receive interrupt processing in
	     units of 1us.  The	accepted range is 0 to 65, the default is
	     65(65us).	Value 0	completely disables the	interrupt moderation.
	     The interface need	to be brought down and up again	before a
	     change takes effect.

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

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

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

     re%d: no memory for softc struct!	The driver failed to allocate memory
     for per-device instance information during	initialization.

     re%d: failed to enable memory mapping!  The driver	failed to initialize
     PCI shared	memory mapping.	 This might happen if the card is not in a
     bus-master	slot.

     re%d: no memory for jumbo buffers!	 The driver failed to allocate memory
     for jumbo frames during initialization.

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

SEE ALSO
     altq(4), arp(4), miibus(4), netintro(4), ng_ether(4), polling(4),
     rgephy(4),	vlan(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.

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	Mar-
     vell 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 per-
     forming 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 plac-
     ing the chip in digital loopback mode and initiating a packet transmis-
     sion.  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.

FreeBSD	10.1		       January 26, 2011			  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | HARDWARE | LOADER TUNABLES | SYSCTL VARIABLES | DIAGNOSTICS | SEE ALSO | HISTORY | AUTHORS | BUGS

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