1.\" Copyright (c) 1997, 1998, 1999 2.\" Bill Paul <wpaul@ee.columbia.edu>. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by Bill Paul. 15.\" 4. Neither the name of the author nor the names of any co-contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD 23.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 29.\" THE POSSIBILITY OF SUCH DAMAGE. 30.\" 31.\" $FreeBSD: src/share/man/man4/dc.4,v 1.6.2.9 2003/02/17 21:20:39 trhodes Exp $ 32.\" $DragonFly: src/share/man/man4/dc.4,v 1.7 2007/02/25 12:03:07 swildner Exp $ 33.\" 34.Dd November 20, 1999 35.Dt DC 4 36.Os 37.Sh NAME 38.Nm dc 39.Nd "DEC/Intel 21143 and clone 10/100 ethernet driver" 40.Sh SYNOPSIS 41.Cd "device miibus" 42.Cd "device dc" 43.Sh DESCRIPTION 44The 45.Nm 46driver provides support for several PCI fast ethernet adapters and 47embedded controllers based on the following chipsets: 48.Pp 49.Bl -bullet -compact -offset indent 50.It 51DEC/Intel 21143 52.It 53Macronix 98713, 98713A, 98715, 98715A and 98725 54.It 55Davicom DM9100, DM9102 and DM9102A 56.It 57ASIX Electronics AX88140A and AX88141 58.It 59ADMtek AL981 Comet and AN985 Centaur 60.It 61Lite-On 82c168 and 82c169 PNIC 62.It 63Lite-On/Macronix 82c115 PNIC II 64.It 65Conexant LANfinity RS7112 (miniPCI) 66.El 67.Pp 68All of these chips have the same general register layout, DMA 69descriptor format and method of operation. 70All of the clone chips 71are based on the 21143 design with various modifications. 72The 7321143 itself has support for 10baseT, BNC, AUI, MII and symbol 74media attachments, 10 and 100Mbps speeds in full or half duplex, 75built in NWAY autonegotiation and wake on LAN. 76The 21143 also 77offers several receive filter programming options including 78perfect filtering, inverse perfect filtering and hash table 79filtering. 80.Pp 81Some clone chips duplicate the 21143 fairly closely while others 82only maintain superficial similarities. 83Some support only MII 84media attachments. 85Others use different receiver filter programming 86mechanisms. 87At least one supports only chained DMA descriptors 88(most support both chained descriptors and contiguously allocated 89fixed size rings). Some chips (especially the PNIC) also have 90peculiar bugs. 91The 92.Nm 93driver does its best to provide generalized support for all 94of these chipsets in order to keep special case code to a minimum. 95.Pp 96These chips are used by many vendors which makes it 97difficult to provide a complete list of all supported cards. 98The 99following NICs are known to work with the 100.Nm 101driver at this time: 102.Pp 103.Bl -bullet -compact -offset indent 104.It 105Digital DE500-BA 10/100 (21143, non-MII) 106.It 107Built in 10Mbps only ethernet on Compaq Presario 7900 series 108desktops (21143, non-MII) 109.It 110Built in ethernet on LinkSys EtherFast 10/100 Instant GigaDrive (DM9102, MII) 111.It 112Kingston KNE100TX (21143, MII) 113.It 114D-Link DFE-570TX (21143, MII, quad port) 115.It 116NDC SOHOware SFA110 (98713A) 117.It 118SVEC PN102-TX (98713) 119.It 120CNet Pro120A (98715A or 98713A) and CNet Pro120B (98715) 121.It 122Compex RL100-TX (98713 or 98713A) 123.It 124LinkSys LNE100TX (PNIC 82c168, 82c169) 125.It 126NetGear FA310-TX Rev. D1, D2 or D3 (PNIC 82c169) 127.It 128Matrox FastNIC 10/100 (PNIC 82c168, 82c169) 129.It 130Kingston KNE110TX (PNIC 82c169) 131.It 132LinkSys LNE100TX v2.0 (PNIC II 82c115) 133.It 134Jaton XpressNet (Davicom DM9102) 135.It 136Alfa Inc GFC2204 (ASIX AX88140A) 137.It 138CNet Pro110B (ASIX AX88140A) 139.El 140.Pp 141The 142.Nm 143driver supports the following media types: 144.Pp 145.Bl -tag -width xxxxxxxxxxxxxxxxxxxx 146.It autoselect 147Enable autoselection of the media type and options. 148The user can manually override 149the autoselected mode by adding media options to the 150.Pa /etc/rc.conf 151file. 152.Pp 153Note: the built-in NWAY autonegotiation on the original PNIC 82c168 154chip is horribly broken and is not supported by the 155.Nm 156driver at this time (see the 157.Sx BUGS 158section for details). 159The original 82c168 appears 160on very early revisions of the LinkSys LNE100TX and Matrox FastNIC. 161.It 10baseT/UTP 162Set 10Mbps operation. 163The 164.Ar mediaopt 165option can also be used to enable 166.Ar full-duplex 167operation. 168Not specifying 169.Ar full duplex 170implies 171.Ar half-duplex 172mode. 173.It 100baseTX 174Set 100Mbps (fast ethernet) operation. 175The 176.Ar mediaopt 177option can also be used to enable 178.Ar full-duplex 179operation. 180Not specifying 181.Ar full duplex 182implies 183.Ar half-duplex 184mode. 185.El 186.Pp 187The 188.Nm 189driver supports the following media options: 190.Pp 191.Bl -tag -width xxxxxxxxxxxxxxxxxxxx 192.It full-duplex 193Force full duplex operation. 194The interface will operate in 195half duplex mode if this media option is not specified. 196.El 197.Pp 198Note that the 100baseTX media type may not be available on certain 199Intel 21143 adapters which support 10mbps media attachments only. 200For more information on configuring this device, see 201.Xr ifconfig 8 . 202.Sh DIAGNOSTICS 203.Bl -diag 204.It "dc%d: couldn't map ports/memory" 205A fatal initialization error has occurred. 206.It "dc%d: couldn't map interrupt" 207A fatal initialization error has occurred. 208.It "dc%d: watchdog timeout" 209A packet was queued for transmission and a transmit command was 210issued, but the device failed to acknowledge the transmission 211before a timeout expired. 212This can happen if the device is unable 213to deliver interrupts for some reason, of if there is a problem with 214the network connection (cable or network equipment) that results in a loss 215of link. 216.It "dc%d: no memory for rx list" 217The driver failed to allocate an mbuf for the receiver ring. 218.It "dc%d: TX underrun -- increasing TX threshold" 219The device generated a transmit underrun error while attempting to 220DMA and transmit a packet. 221This happens if the host is not able to 222DMA the packet data into the NIC's FIFO fast enough. 223The driver 224will dynamically increase the transmit start threshold so that 225more data must be DMAed into the FIFO before the NIC will start 226transmitting it onto the wire. 227.It "dc%d: TX underrun -- using store and forward mode" 228The device continued to generate transmit underruns even after all 229possible transmit start threshold settings had been tried, so the 230driver programmed the chip for store and forward mode. 231In this mode, 232the NIC will not begin transmission until the entire packet has been 233transfered into its FIFO memory. 234.It "dc%d: chip is in D3 power state -- setting to D0" 235This message applies only to adapters which support power 236management. 237Some operating systems place the controller in low power 238mode when shutting down, and some PCI BIOSes fail to bring the chip 239out of this state before configuring it. 240The controller loses all of 241its PCI configuration in the D3 state, so if the BIOS does not set 242it back to full power mode in time, it won't be able to configure it 243correctly. 244The driver tries to detect this condition and bring 245the adapter back to the D0 (full power) state, but this may not be 246enough to return the driver to a fully operational condition. 247If 248you see this message at boot time and the driver fails to attach 249the device as a network interface, you will have to perform a second 250warm boot to have the device properly configured. 251.Pp 252Note that this condition only occurs when warm booting from another 253operating system. 254If you power down your system prior to booting 255.Dx , 256the card should be configured correctly. 257.El 258.Sh SEE ALSO 259.Xr arp 4 , 260.Xr ifmedia 4 , 261.Xr miibus 4 , 262.Xr netintro 4 , 263.Xr ng_ether 4 , 264.Xr polling 4 , 265.Xr ifconfig 8 266.Rs 267.%T ADMtek AL981, AL983 and AL985 data sheets 268.%O http://www.admtek.com.tw 269.Re 270.Rs 271.%T ASIX Electronics AX88140A and AX88141 data sheets 272.%O http://www.asix.com.tw 273.Re 274.Rs 275.%T Davicom DM9102 data sheet 276.%O http://www.davicom8.com 277.Re 278.Rs 279.%T Intel 21143 Hardware Reference Manual 280.%O http://developer.intel.com 281.Re 282.Rs 283.%T Macronix 98713/A, 98715/A and 98725 data sheets 284.%O http://www.macronix.com 285.Re 286.Rs 287.%T Macronix 98713/A and 98715/A app notes 288.%O http://www.macronix.com 289.Re 290.Sh HISTORY 291The 292.Nm 293device driver first appeared in 294.Fx 4.0 . 295.Sh AUTHORS 296The 297.Nm 298driver was written by 299.An Bill Paul Aq wpaul@ee.columbia.edu . 300.Sh BUGS 301The Macronix application notes claim that in order to put the 302chips in normal operation, the driver must write a certain magic 303number into the CSR16 register. 304The numbers are documented in 305the app notes, but the exact meaning of the bits is not. 306.Pp 307The 98713A seems to have a problem with 10Mbps full duplex mode. 308The transmitter works but the receiver tends to produce many 309unexplained errors leading to very poor overall performance. 310The 31198715A does not exhibit this problem. 312All other modes on the 31398713A seem to work correctly. 314.Pp 315The original 82c168 PNIC chip has built in NWAY support which is 316used on certain early LinkSys LNE100TX and Matrox FastNIC cards, 317however it is horribly broken and difficult to use reliably. 318Consequently, autonegotiation is not currently supported for this 319chipset: the driver defaults the NIC to 10baseT half duplex, and it's 320up to the operator to manually select a different mode if necessary. 321(Later cards use an external MII transceiver to implement NWAY 322autonegotiation and work correctly.) 323.Pp 324The 325.Nm 326driver programs 82c168 and 82c169 PNIC chips to use the store and 327forward setting for the transmit start threshold by default. 328This 329is to work around problems with some NIC/PCI bus combinations where 330the PNIC can transmit corrupt frames when operating at 100Mbps, 331probably due to PCI DMA burst transfer errors. 332.Pp 333The 82c168 and 82c169 PNIC chips also have a receiver bug that 334sometimes manifests during periods of heavy receive and transmit 335activity, where the chip will improperly DMA received frames to 336the host. 337The chips appear to upload several kilobytes of garbage 338data along with the received frame data, dirtying several RX buffers 339instead of just the expected one. 340The 341.Nm 342driver detects this condition and will salvage the frame; however, 343it incurs a serious performance penalty in the process. 344.Pp 345The PNIC chips also sometimes generate a transmit underrun error when 346the driver attempts to download the receiver filter setup frame, which 347can result in the receive filter being incorrectly programmed. 348The 349.Nm 350driver will watch for this condition and requeue the setup frame until 351it is transfered successfully. 352.Pp 353The ADMtek AL981 chip (and possibly the AN985 as well) has been observed 354to sometimes wedge on transmit: this appears to happen when the driver 355queues a sequence of frames which cause it to wrap from the end of the 356transmit descriptor ring back to the beginning. 357The 358.Nm 359driver attempts to avoid this condition by not queing any frames past 360the end of the transmit ring during a single invocation of the 361.Fn dc_start 362routine. 363This workaround has a negligible impact on transmit performance. 364