RE(4) | Device Drivers Manual | RE(4)

# NAME

`re` —
RealTek 8139C+/8169/8169S/8168/8110S/8111 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, RTL8168, and RTL8110S PCI/Cardbus Ethernet controllers, including the following:

- Alloy Computer Products EtherGOLD 1439E 10/100 (8139C+)
- Compaq Evo N1015v Integrated Ethernet (8139C+)
- Gigabyte 7N400 Pro2 Integrated Gigabit Ethernet (8110S)
- NETGEAR GA311 (8169S)
- PLANEX COMMUNICATIONS Inc. GN-1200TC (8169S)
- Xterasys XN-152 10/100/1000 NIC (8169)
- Corega CG-LAPCIGT Gigabit Ethernet (8169S)
- D-Link DGE-528T Gigabit Ethernet (8169S)
- D-Link DGE-530T rev. C & D Gigabit Ethernet (8169)
- US Robotics (3Com) USR997902 Gigabit Ethernet (8169S)
- Linksys EG1032 rev. 3 Gigabit Ethernet (8169S)
- TP-Link TG-3468 v2 & v3 Gigabit Ethernet (8168)

NICs based on the 8139C+ are capable of 10 and 100Mbps speeds over CAT5 cable. NICs based on the 8169, 8169S, 8168, and 8110S are capable of 10, 100, and 1000Mbps operation.

All NICs supported by the `re` driver have IP/TCP/UDP 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 applications.

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 transmission. 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.

November 18, 2019 | NetBSD 9.4