1 .. SPDX-License-Identifier: GPL-2.0 1 .. SPDX-License-Identifier: GPL-2.0
2 2
3 ============================================== 3 =====================================================
4 Notes on the DEC FDDIcontroller 700 (DEFZA-xx) 4 Notes on the DEC FDDIcontroller 700 (DEFZA-xx) driver
5 ============================================== 5 =====================================================
6 6
7 :Version: v.1.1.4 7 :Version: v.1.1.4
8 8
9 9
10 DEC FDDIcontroller 700 is DEC's first-generati 10 DEC FDDIcontroller 700 is DEC's first-generation TURBOchannel FDDI
11 network card, designed in 1990 specifically fo 11 network card, designed in 1990 specifically for the DECstation 5000
12 model 200 workstation. The board is a single 12 model 200 workstation. The board is a single attachment station and
13 it was manufactured in two variations, both of 13 it was manufactured in two variations, both of which are supported.
14 14
15 First is the SAS MMF DEFZA-AA option, the orig 15 First is the SAS MMF DEFZA-AA option, the original design implementing
16 the standard MMF-PMD, however with a pair of S 16 the standard MMF-PMD, however with a pair of ST connectors rather than
17 the usual MIC connector. The other one is the 17 the usual MIC connector. The other one is the SAS ThinWire/STP DEFZA-CA
18 option, denoted 700-C, with the network medium 18 option, denoted 700-C, with the network medium selectable by a switch
19 between the DEC proprietary ThinWire-PMD using 19 between the DEC proprietary ThinWire-PMD using a BNC connector and the
20 standard STP-PMD using a DE-9F connector. Thi 20 standard STP-PMD using a DE-9F connector. This option can interface to
21 a DECconcentrator 500 device and, in the case 21 a DECconcentrator 500 device and, in the case of the STP-PMD, also other
22 FDDI equipment and was designed to make it eas 22 FDDI equipment and was designed to make it easier to transition from
23 existing IEEE 802.3 10BASE2 Ethernet and IEEE 23 existing IEEE 802.3 10BASE2 Ethernet and IEEE 802.5 Token Ring networks
24 by providing means to reuse existing cabling. 24 by providing means to reuse existing cabling.
25 25
26 This driver handles any number of cards instal 26 This driver handles any number of cards installed in a single system.
27 They get fddi0, fddi1, etc. interface names as 27 They get fddi0, fddi1, etc. interface names assigned in the order of
28 increasing TURBOchannel slot numbers. 28 increasing TURBOchannel slot numbers.
29 29
30 The board only supports DMA on the receive sid 30 The board only supports DMA on the receive side. Transmission involves
31 the use of PIO. As a result under a heavy tra 31 the use of PIO. As a result under a heavy transmission load there will
32 be a significant impact on system performance. 32 be a significant impact on system performance.
33 33
34 The board supports a 64-entry CAM for matching 34 The board supports a 64-entry CAM for matching destination addresses.
35 Two entries are preoccupied by the Directed Be 35 Two entries are preoccupied by the Directed Beacon and Ring Purger
36 multicast addresses and the rest is used as a 36 multicast addresses and the rest is used as a multicast filter. An
37 all-multi mode is also supported for LLC frame 37 all-multi mode is also supported for LLC frames and it is used if
38 requested explicitly or if the CAM overflows. 38 requested explicitly or if the CAM overflows. The promiscuous mode
39 supports separate enables for LLC and SMT fram 39 supports separate enables for LLC and SMT frames, but this driver
40 doesn't support changing them individually. 40 doesn't support changing them individually.
41 41
42 42
43 Known problems: 43 Known problems:
44 44
45 None. 45 None.
46 46
47 47
48 To do: 48 To do:
49 49
50 5. MAC address change. The card does not supp 50 5. MAC address change. The card does not support changing the Media
51 Access Controller's address registers but a 51 Access Controller's address registers but a similar effect can be
52 achieved by adding an alias to the CAM. Th 52 achieved by adding an alias to the CAM. There is no way to disable
53 matching against the original address thoug 53 matching against the original address though.
54 54
55 7. Queueing incoming/outgoing SMT frames in th 55 7. Queueing incoming/outgoing SMT frames in the driver if the SMT
56 receive/RMC transmit ring is full. (?) 56 receive/RMC transmit ring is full. (?)
57 57
58 8. Retrieving/reporting FDDI/SNMP stats. 58 8. Retrieving/reporting FDDI/SNMP stats.
59 59
60 60
61 Both success and failure reports are welcome. 61 Both success and failure reports are welcome.
62 62
63 Maciej W. Rozycki <macro@orcam.me.uk> 63 Maciej W. Rozycki <macro@orcam.me.uk>
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