RL(4) FreeBSD Kernel Interfaces Manual RL(4)
NAME
rl - Realtek 8129/8139 10/100 Ethernet device
SYNOPSIS
rl* at pci?
rl* at cardbus?
rlphy* at mii?
DESCRIPTION
The rl driver provides support for PCI Ethernet adapters and embedded
controllers based on the Realtek 8129 and 8139 Fast Ethernet controller
chips. This includes, among others, the following cards:
Accton MPX5030 CardBus
Allied Telesyn AT2550
Corega FEther CB-TXD 10/100 Ethernet
D-Link DFE-520TX C1, DFE-530TX+, DFE-538TX, DFE-690TXD
Encore ENL832-TX-RENT 10/100 M PCI
Genius GF100TXR
KTX-9130TX 10/100 Fast Ethernet
Longshine LCS-8038TX-R
NDC Communications NE100TX-E
Netgear FA311 v2
Netronix Inc. EA-1210 NetEther 10/100
Nortel BayStack 21
OvisLink LEF-8129TX, LEF-8139TX
SMC EZ Card 10/100 PCI 1211-TX
TRENDnet TE100-PCBUSR CardBus
The Realtek controllers use bus master DMA but do not use a descriptor-
based data transfer mechanism. The receiver uses a single fixed size
ring buffer from which packets must be copied into mbufs. For
transmission, there are only four outbound packet address registers which
require all outgoing packets to be stored as contiguous buffers.
Furthermore, outbound packet buffers must be longword aligned or else
transmission will fail.
The 8129 differs from the 8139 in that the 8139 has an internal PHY which
is controlled through special direct access registers whereas the 8129
uses an external PHY via an MII bus. The 8139 supports both 10 and
100Mbps speeds in either full or half duplex. The 8129 can support the
same speeds and modes given an appropriate PHY chip.
The rl driver supports the following media types:
autoselect Enable autoselection of the media type and options. This is
only supported if the PHY chip attached to the Realtek
controller supports NWAY autonegotiation. The user can
manually override the autoselected mode by adding media
options to the appropriate hostname.if(5) file.
10baseT Set 10Mbps operation. The mediaopt option can also be used
to select either full-duplex or half-duplex modes.
100baseTX Set 100Mbps (Fast Ethernet) operation. The mediaopt option
can also be used to select either full-duplex or half-duplex
modes.
The rl driver supports the following media options:
full-duplex Force full duplex operation.
half-duplex Force half duplex operation.
Note that the 100baseTX media type is only available if supported by the
adapter. For more information on configuring this device, see
ifconfig(8).
DIAGNOSTICS
rl0: couldn't map memory A fatal initialization error has occurred.
rl0: couldn't map interrupt A fatal initialization error has occurred.
rl0: watchdog timeout The device has stopped responding to the network,
or there is a problem with the network connection (cable).
rl0: no memory for rx list The driver failed to allocate an mbuf for the
receiver ring.
rl0: no memory for tx list The driver failed to allocate an mbuf for the
transmitter ring when allocating a pad buffer or collapsing an mbuf chain
into a cluster.
SEE ALSO
arp(4), ifmedia(4), intro(4), netintro(4), rlphy(4), hostname.if(5),
ifconfig(8)
The Realtek 8129 and 8139 datasheets, ftp.realtek.com.tw:/lancard/data
sheet.
HISTORY
The rl device driver first appeared in FreeBSD 3.0. OpenBSD support
first appeared in OpenBSD 2.5.
AUTHORS
The rl driver was written by Bill Paul <
[email protected]>.
BUGS
Since outbound packets must be longword aligned, the transmit routine has
to copy an unaligned packet into an mbuf cluster buffer before
transmission. The driver abuses the fact that the cluster buffer pool is
allocated at system startup time in a contiguous region starting at a
page boundary. Since cluster buffers are 2048 bytes, they are longword
aligned by definition. The driver probably should not be depending on
this characteristic.
The Realtek data sheets are of especially poor quality: the grammar and
spelling are awful and there is a lot of information missing,
particularly concerning the receiver operation. One particularly
important fact that the data sheets fail to mention relates to the way in
which the chip fills in the receive buffer. When an interrupt is posted
to signal that a frame has been received, it is possible that another
frame might be in the process of being copied into the receive buffer
while the driver is busy handling the first one. If the driver manages
to finish processing the first frame before the chip is done DMAing the
rest of the next frame, the driver may attempt to process the next frame
in the buffer before the chip has had a chance to finish DMAing all of
it.
The driver can check for an incomplete frame by inspecting the frame
length in the header preceding the actual packet data: an incomplete
frame will have the magic length of 0xFFF0. When the driver encounters
this value, it knows that it has finished processing all currently
available packets. Neither this magic value nor its significance are
documented anywhere in the Realtek data sheets.
FreeBSD 14.1-RELEASE-p8 July 16, 2013 FreeBSD 14.1-RELEASE-p8