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README.Rhialto
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1994-01-28
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Short: SANA2 rh(c)slip.device
Uploader: Pekka.Pessi@hut.fi
Type: comm/net
Version: $Id: README.Rhialto,v 38.1 1994/01/25 09:31:56 ppessi Exp $
This is a modified version of Commodores example SANA driver:
the slip.device. As released, it contained a number of bugs and
misfeatures. This version has been renamed to rh(c)slip.device.
This is second major release of rh(c)slip.device, containing some new
features and bug fixes.
Installation
------------
- Summary: Place the file rh(c)slip.device in DEVS:Networks/ and
slip<unit>.config in ENV:SANA2/ and ENVARC:SANA2/.
If the configuration file rhslip<unit>.config is not found, then
(rhcslip.device tries also cslip<unit>.config) slip<unit>.config. This
is for compatibility with other (c)slip devices.
- If you are going to compile rh(c)slip.device, it is best to get the
full, original SANA developer package. It is available on Fish disk
number 779. Newer versions may be available by ftp.
Additions
---------
V38:
- New EOFMODE flag in configuration file determines whether the
SERF_EOFMODE feature of serial device is used. This prevents the
slip.device from hogging the CPU at high priority, and even at equal
priority improves efficiency. This may not work with all serial device
replacements.
- You can change the maximum frame size with the new MTU parameter in the
configuration file.
V37:
- Now also header-compressed slip. (See RFC-1144 by Van Jacobson). This
is even compatible with non-comressing slip drivers, as it first tries
to trigger the other side of the connection into using compression as
well, but ceases these attempts if they appear unsuccessful. In any
case, once the other side starts sending compressed headers, it is
turned on in the local-to-remote direction as well.
Corrected bugs
--------------
V38:
- There was a problem with header compression failures. The device driver
dropped IO message if an error occurred in the header uncompression
routine. The driver eventually jammed when all IO requests had been
lost.
- The CD flag messed with online state. The serial device was closed
while the driver thought to be online. The CD sensing code is also
sanitized, the CD line is checked every time a packet is sent.
- The offline code is now *supposed* to work with DEMANDREAD.
V37:
- The AbortIO function erroneously assumed that A3 was the Unit pointer.
Even Commodore's official example in the RKM gets that wrong (see page
567).
- S2_GETGLOBALSTATS always returned an error, even though it worked.
Well, it got the microseconds of the last online wrong.
- S2_TRACKTYPE had two bugs: it would always think a type that you
requested to track would not yet be tracked, even if it would get the
packet type right, which it didn't. As a result, every call to
S2_TRACKTYPE allocated memory for the statistics, yet S2_GETTYPESTATS
always claimed the type wasn't being tracked.
- S2_GETSTATIONADDRESS should return 2 addresses, the current address, and
the ROM address. It used to give only a 0.0.0.0 "ROM" address in the
wrong location. Now, it considers the address in the config file the
"ROM" address, and the one from S2_CONFIGINTERFACE is the current
address. Initially both are the same (and both are futher ignored since
they are meaningless to slip).
- S2_DEVICEQUERY didn't give all required information, and claimed a weird
size for it.
- Flags set when opening the serial device should be in io->io_SerFlags,
not in the flags argument to OpenDevice().
- Returned read requests from the serial device were sized by their
io_Length instead of io_Actual.
- Serial input could potentially overflow the input buffer.
- The code assumed, by using registered arguments, that the callback
routines would have their arguments in the correct registers. Now the
type of the pointer explicitly declares the calling convention.
- Eliminated use of SLIPBase as __builtin_getreg(14).
Corrected misfeatures
---------------------
- The device now runs at the same priority as the opener. This helps
preventing starvation of the opener in case of high amounts of input.
- Uses the serial.device's SERF_EOFMODE mode. This prevents the
slip.device from hogging the CPU at high priority, and even at equal
priority improves efficiency.
Debatable issues
----------------
- Optionally, serial device reads are only initiated when they are
(already) requested by the caller. This is contrary to the SANA
philosophy, and therefore makes debugging protocol stacks more
difficult. On the other hand, why not use the serial device's buffer to
keep input, instead of dropping it? This also reduces CPU load in case
the device is open but unused for some reason. (As it was, the
slip.device would continually read and decode packets, even if nobody
wanted them.)