if_re man page on FreeBSD

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RE(4)			 BSD 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:

     ·	 Alloy Computer Products EtherGOLD 1439E 10/100 (8139C+)
     ·	 Compaq Evo N1015v Integrated Ethernet (8139C+)
     ·	 Corega CG-LAPCIGT Gigabit Ethernet (8169S)
     ·	 D-Link DGE-528(T) Gigabit Ethernet (8169S)
     ·	 Gigabyte 7N400 Pro2 Integrated Gigabit Ethernet (8110S)
     ·	 LevelOne GNC-0105T (8169S)
     ·	 LinkSys EG1032 (32-bit PCI)
     ·	 PLANEX COMMUNICATIONS Inc. GN-1200TC (8169S)
     ·	 USRobotics USR997902 Gigabit Ethernet (8169S)
     ·	 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.msi_disable
	     This tunable disables MSI support on the Ethernet hardware.  The
	     default value is 0.

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 insure 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 15, 2011				   BSD
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