I actually made some progress determining the protocol by using a PC running
BasiliskII (Mac emulator) and logging all the SCSI activity.

From what I recall...

The Dayna is actually a pretty well behaved device. It identifies itself as
a SCSI communications device and uses standard read and write commands,
along with a couple of vendor-specific commands which appear to have
something to do with setup/status (I remember seeing the MACID of the box
come back in one of the response packets.)

Operation appeared to be totally polled. Once every 500ms, the system would
request a 1500 byte read and usually get a zero-byte response.

The two main things which would need to be figured out are:

1) The vendor-specific commands
2) The format of the data sent expected on a read or write command. I
suspect that it is a standard packet, probably without some of the low-level
encapsulation. (Cross checking the Basilisk logs with the output of a
sniffer would probably give you the answer real quick.)

IIRC, the Cabletron works similarly, but totally uses vendor-specific
commands, even for read/wite of packets.

FYI, someone in Japan wrote a driver for the Sonic SCSI/Ethernet box which
appeared, at first blush, to work similarly to the Dayna. It may be worth
running that down too. (Aside to Allen, can we look at getting it into the
tree?)

<<<John>>>

> From: Mattias Sandstrom <mattias@beauty.se>
> Date: Sat, 25 May 2002 21:00:40 +0200
> To: jruschme@hiway1.exit109.com
> Cc: port-mac68k@netbsd.org
> Subject: Re: Protocol of DaynaPORT SCSI/Link
> 
> hey,
> 
> found this on the net from way back. any luck? i'm actually thinking of
> taking on this very project myself, so i was wondering if you had any
> info on whether this device works anything like the one we have support
> for? i have disassembled the macos driver for the dayna device, and it
> exports all its functions by name, so the code is quite easy to read,
> but i'd much rather try to just change the basic scsi commands and maybe
> a buffer size or timer here and there than try to rewrite a driver from
> scratch... ;-)
> 
> /matt
> 
> --
> Subject: Protocol of DaynaPORT SCSI/Link
> To: None <port-mac68k@netbsd.org, tech-net@netbsd.org,
> classic-post@hitznet.com,>
> From: John Ruschmeyer <jruschme@hiway1.exit109.com>
> List: tech-net
> Date: 11/17/1998 13:59:12
> 
> I recently acquired a DaynaPORT SCSI/Link-T SCSI-to-Ethernet adapter for
> my SE/30. Ultimately, I'd also like to try and extend the NetBSD 'se'
> (SCSI Ethernet) driver to include support for the SCSI/Link. To do that,
> though, I need info on the protocol used between the host and the SCSI/Link.
> 
> Does anyone out there have that info? I have an e-mail request into
> Dayna's customer service, but so far it has gone unanswered.
> 
> Thanks for any help...
> <<<John>>
> 
>