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Annotation of 43BSDReno/share/doc/smm/13.kchanges/vaxif.t, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1986 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)vaxif.t     1.7 (Berkeley) 4/11/86
        !             6: .\"
        !             7: .NH
        !             8: VAX Network Interface drivers
        !             9: .PP
        !            10: Most of the changes in the network interfaces follow common patterns
        !            11: that are summarized in categories.
        !            12: In addition, there are a number of bug fixes.
        !            13: The change that was made universally to the interface handlers
        !            14: was to remove the \fIioctl\fP routines that set the interface address
        !            15: and flags, replacing them by simpler routines
        !            16: that merely initialize the hardware if this has not already been done.
        !            17: Several of the drivers notice when the IFF_UP flag is cleared
        !            18: and perform a hardware reset, then reinitialize the interface
        !            19: when IFF_UP is set again.
        !            20: This allows interfaces to be turned off, and also provides
        !            21: a mechanism to reset devices that have lost interrupts
        !            22: or otherwise stopped functioning.
        !            23: The handling of the other interface flags has been made more consistent.
        !            24: IFF_RUNNING is used uniformly to indicate that UNIBUS resources
        !            25: have been allocated and that the board has been initialized.
        !            26: The reset routines clear this flag before reinitializing
        !            27: so that both operations will be repeated.
        !            28: .NH 2
        !            29: Interface UNIBUS support
        !            30: .PP
        !            31: The UNIBUS common support routines for network interfaces
        !            32: have been modified to support multiple transmit and receive buffers
        !            33: per device.
        !            34: A set of macros provide a nearly-compatible interface
        !            35: for devices using a single buffer of each type.
        !            36: When placing received packets into mbufs, \fIif_ubaget\fP
        !            37: prepends a pointer to the receiving interface to the data;
        !            38: this requires that the interface pointer be passed to \fIif_ubaget\fP
        !            39: or \fIif_rubaget\fP as an additional argument.
        !            40: When removing the trailer header from the front of a packet,
        !            41: interface receive routines must move the interface pointer
        !            42: which precedes the header; see one of the existing drivers
        !            43: for an example.
        !            44: When received data is larger than half of an mbuf cluster,
        !            45: the data will be placed in an mbuf cluster rather than a chain of small
        !            46: mbufs.
        !            47: Similarly, in \fIif_ubaput\fP, clusters may be remapped instead of copied
        !            48: if they are at least one-half full and are the last mbuf of the chain.
        !            49: For devices like the DEC DEUNA that wish to perform receive operations
        !            50: on a transmit buffer, the transmit buffers are marked.
        !            51: Receive operations from transmit buffers force page mapping to be consistent
        !            52: before attempting to read data or swap pages from them.
        !            53: .NH 2
        !            54: 10 Mb/s Ethernet
        !            55: .PP
        !            56: The 10Mb/s Ethernet handlers have been modified to use the new ARP
        !            57: interfaces.
        !            58: They no longer use \fIarpattach\fP, and the call to \fIarpresolve\fP
        !            59: contains an additional argument for a second return, a boolean for
        !            60: the use of trailer encapsulations.
        !            61: Input and output functions were augmented to handle NS IDP packets.
        !            62: For hosts using Xerox NS with multiple interfaces,
        !            63: the drivers are able to reprogram the physical address on each
        !            64: board so that all interfaces use the address of the first
        !            65: configured interface.
        !            66: The hardware Ethernet addresses are printed during autoconfiguration.
        !            67: .NH 2
        !            68: Changes specific to individual drivers
        !            69: .XP if_acc.c
        !            70: An additional word was added to the input buffer
        !            71: to allow space for the end-of-message bit on a maximum-sized
        !            72: message without segmentation.
        !            73: This avoids a hardware problem that sometimes causes the next packet
        !            74: to be concatenated with the end-of-message segment.
        !            75: .XP if_ddn.c
        !            76: A new driver from ACC for the ACC DDN Standard mode X.25 IMP interface.
        !            77: .XP if_de.c
        !            78: A new driver for the DEC DEUNA 10 Mb/s Ethernet controller.
        !            79: The hardware is reset when \fIifconfig\fPed down
        !            80: and reinitialized when marked up again.
        !            81: .XP if_dmc.c
        !            82: The DMC-11/DMR-11 driver has been made much more robust.
        !            83: It now uses multiple transmit and receive buffers.
        !            84: A link-layer encapsulation is used to indicate the type of the packet;
        !            85: this driver is thus incompatible with the 4.2BSD DMC driver.
        !            86: (The driver is, however, compatible with current ULTRIX drivers.)
        !            87: .XP if_ec.c
        !            88: The handler for the 3Com 10 Mb/s Ethernet controller
        !            89: is now able to support multiple units.
        !            90: The address of the UNIBUS memory is taken from the flags in the configuration
        !            91: file; note that address 0 is still the default.
        !            92: The UNIBUS memory is configured in a separate memory-probe routine
        !            93: that is called during autoconfiguration and after a UNIBUS reset.
        !            94: This allows the 3Com interface reset to work correctly.
        !            95: The collision backoff algorithm was corrected so that the maximum backoff
        !            96: is within the specification, rather than waiting seconds after numerous
        !            97: collisions.
        !            98: The private \fIecget\fP and \fIecput\fP routines were modified
        !            99: to correspond with the \fIif_uba\fP routines.
        !           100: The hardware is reset when \fIifconfig\fPed down
        !           101: and reinitialized when marked up again.
        !           102: .XP if_en.c
        !           103: The 3 Mb/s Experimental Ethernet driver now supports NS IDP packets,
        !           104: using a simple algorithmic conversion of host to Ethernet addresses.
        !           105: The \fIenswab\fP function was corrected.
        !           106: .XP if_ex.c
        !           107: A new driver for the Excelan 204 10 Mb/s Ethernet controller,
        !           108: used as a link-layer interface.
        !           109: .XP if_hdh.c
        !           110: A new driver for the ACC HDH IMP interface.
        !           111: .XP if_hy.c
        !           112: A new version of the Hyperchannel driver from Tektronix was installed.
        !           113: It is untested with 4.3BSD.
        !           114: .XP if_il.c
        !           115: The Interlan 1010 and 1010A driver now resets the interface
        !           116: and checks the result of hardware diagnostics when initializing the board.
        !           117: The hardware is reset when \fIifconfig\fPed down
        !           118: and reinitialized when marked up again.
        !           119: .XP if_ix.c
        !           120: A new driver for using the Interlan NP100 10 Mb/s Ethernet controller
        !           121: as a link-level interface.
        !           122: .XP if_uba.c
        !           123: In addition to the major changes in UNIBUS support functions,
        !           124: there were several bug fixes made.
        !           125: Interfaces with no link-level header are set up properly.
        !           126: A variable was reused incorrectly in \fIif_wubaput\fP, and this
        !           127: has been corrected.
        !           128: .XP if_vv.c
        !           129: The driver for the Proteon proNET has been reworked in several areas.
        !           130: The elaborate error handling code had several problems and was simplified
        !           131: considerably.
        !           132: The driver includes support for both the 10 Mb/s and 80 Mb/s rings.
        !           133: The byte ordering of the trailer fields was corrected;
        !           134: this makes the trailer format incompatible with the 4.2BSD driver.

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