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RE(4)			     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  hard-
     ware VLAN tagging/insertion features, and use a descriptor-based DMA mecha-
     nism.  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 de-
     signed 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)
     *	 TP-Link TG-3468 v2 Gigabit Ethernet (8168)
     *	 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.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 inter-
	     rupt 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 register map-
	     ping.  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-mas-
     ter 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),  rge-
     phy(4), vlan(4), ifconfig(8)

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

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 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, how-
     ever  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 transmission.  If the
     card  functions  properly, the transmitted data will be echoed back unmodi-
     fied.  If the echoed data is corrupt, the driver will print an  error  mes-
     sage  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 trans-
     mitting jumbo frames up to 7.5K in size.

     If this driver is causing problems then an updated driver from  the  vendor
     can be found in ports under net/realtek-re-kmod.

FreeBSD ports 15.1		November 7, 2022			   RE(4)

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